Thomas Gleixner | c942fdd | 2019-05-27 08:55:06 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * TUN - Universal TUN/TAP device driver. |
| 4 | * Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com> |
| 5 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $ |
| 7 | */ |
| 8 | |
| 9 | /* |
| 10 | * Changes: |
| 11 | * |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 12 | * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 |
| 13 | * Add TUNSETLINK ioctl to set the link encapsulation |
| 14 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | * Mark Smith <markzzzsmith@yahoo.com.au> |
Joe Perches | 344dc8e | 2012-07-12 19:33:09 +0000 | [diff] [blame] | 16 | * Use eth_random_addr() for tap MAC address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | * |
| 18 | * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20 |
| 19 | * Fixes in packet dropping, queue length setting and queue wakeup. |
| 20 | * Increased default tx queue length. |
| 21 | * Added ethtool API. |
| 22 | * Minor cleanups |
| 23 | * |
| 24 | * Daniel Podlejski <underley@underley.eu.org> |
| 25 | * Modifications for 2.3.99-pre5 kernel. |
| 26 | */ |
| 27 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 28 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 29 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #define DRV_NAME "tun" |
| 31 | #define DRV_VERSION "1.6" |
| 32 | #define DRV_DESCRIPTION "Universal TUN/TAP device driver" |
| 33 | #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" |
| 34 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/module.h> |
| 36 | #include <linux/errno.h> |
| 37 | #include <linux/kernel.h> |
Ingo Molnar | 174cd4b | 2017-02-02 19:15:33 +0100 | [diff] [blame] | 38 | #include <linux/sched/signal.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <linux/major.h> |
| 40 | #include <linux/slab.h> |
| 41 | #include <linux/poll.h> |
| 42 | #include <linux/fcntl.h> |
| 43 | #include <linux/init.h> |
| 44 | #include <linux/skbuff.h> |
| 45 | #include <linux/netdevice.h> |
| 46 | #include <linux/etherdevice.h> |
| 47 | #include <linux/miscdevice.h> |
| 48 | #include <linux/ethtool.h> |
| 49 | #include <linux/rtnetlink.h> |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 50 | #include <linux/compat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <linux/if.h> |
| 52 | #include <linux/if_arp.h> |
| 53 | #include <linux/if_ether.h> |
| 54 | #include <linux/if_tun.h> |
Jason Wang | 6680ec6 | 2013-07-25 13:00:33 +0800 | [diff] [blame] | 55 | #include <linux/if_vlan.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #include <linux/crc32.h> |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 57 | #include <linux/nsproxy.h> |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 58 | #include <linux/virtio_net.h> |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 59 | #include <linux/rcupdate.h> |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 60 | #include <net/net_namespace.h> |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 61 | #include <net/netns/generic.h> |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 62 | #include <net/rtnetlink.h> |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 63 | #include <net/sock.h> |
Jesper Dangaard Brouer | 735fc40 | 2018-05-24 16:46:12 +0200 | [diff] [blame] | 64 | #include <net/xdp.h> |
Jason A. Donenfeld | b9815eb | 2020-06-29 19:06:22 -0600 | [diff] [blame] | 65 | #include <net/ip_tunnels.h> |
Masatake YAMATO | 93e14b6 | 2014-01-29 16:43:31 +0900 | [diff] [blame] | 66 | #include <linux/seq_file.h> |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 67 | #include <linux/uio.h> |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 68 | #include <linux/skb_array.h> |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 69 | #include <linux/bpf.h> |
| 70 | #include <linux/bpf_trace.h> |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 71 | #include <linux/mutex.h> |
Phillip Potter | cca8ea3 | 2021-04-06 18:45:54 +0100 | [diff] [blame] | 72 | #include <linux/ieee802154.h> |
| 73 | #include <linux/if_ltalk.h> |
| 74 | #include <uapi/linux/if_fddi.h> |
| 75 | #include <uapi/linux/if_hippi.h> |
| 76 | #include <uapi/linux/if_fc.h> |
| 77 | #include <net/ax25.h> |
| 78 | #include <net/rose.h> |
| 79 | #include <net/6lowpan.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 81 | #include <linux/uaccess.h> |
Kirill Tkhai | f2780d6 | 2018-02-14 16:40:14 +0300 | [diff] [blame] | 82 | #include <linux/proc_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
Chas Williams | 4e24f2d | 2018-06-02 17:49:53 -0400 | [diff] [blame] | 84 | static void tun_default_link_ksettings(struct net_device *dev, |
| 85 | struct ethtool_link_ksettings *cmd); |
| 86 | |
Jason Wang | 7df1321 | 2017-09-04 11:36:08 +0800 | [diff] [blame] | 87 | #define TUN_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 88 | |
Michael S. Tsirkin | 031f5e03 | 2014-11-19 14:44:40 +0200 | [diff] [blame] | 89 | /* TUN device flags */ |
| 90 | |
| 91 | /* IFF_ATTACH_QUEUE is never stored in device flags, |
| 92 | * overload it to mean fasync when stored there. |
| 93 | */ |
| 94 | #define TUN_FASYNC IFF_ATTACH_QUEUE |
Michael S. Tsirkin | 1cf8e41 | 2014-12-16 15:05:06 +0200 | [diff] [blame] | 95 | /* High bits in flags field are unused. */ |
| 96 | #define TUN_VNET_LE 0x80000000 |
Greg Kurz | 8b8e658 | 2015-04-24 14:50:36 +0200 | [diff] [blame] | 97 | #define TUN_VNET_BE 0x40000000 |
Michael S. Tsirkin | 031f5e03 | 2014-11-19 14:44:40 +0200 | [diff] [blame] | 98 | |
| 99 | #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \ |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 100 | IFF_MULTI_QUEUE | IFF_NAPI | IFF_NAPI_FRAGS) |
| 101 | |
Michael S. Tsirkin | 0690899 | 2012-07-20 09:23:23 +0000 | [diff] [blame] | 102 | #define GOODCOPY_LEN 128 |
| 103 | |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 104 | #define FLT_EXACT_COUNT 8 |
| 105 | struct tap_filter { |
| 106 | unsigned int count; /* Number of addrs. Zero means disabled */ |
| 107 | u32 mask[2]; /* Mask of the hashed addrs */ |
| 108 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; |
| 109 | }; |
| 110 | |
Pankaj Gupta | baf71c5 | 2015-01-12 11:41:29 +0530 | [diff] [blame] | 111 | /* MAX_TAP_QUEUES 256 is chosen to allow rx/tx queues to be equal |
| 112 | * to max number of VCPUs in guest. */ |
| 113 | #define MAX_TAP_QUEUES 256 |
Jason Wang | b8732fb | 2013-01-23 03:59:13 +0000 | [diff] [blame] | 114 | #define MAX_TAP_FLOWS 4096 |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 115 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 116 | #define TUN_FLOW_EXPIRE (3 * HZ) |
| 117 | |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 118 | /* A tun_file connects an open character device to a tuntap netdevice. It |
stephen hemminger | 92d4ea6 | 2013-12-05 20:42:58 -0800 | [diff] [blame] | 119 | * also contains all socket related structures (except sock_fprog and tap_filter) |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 120 | * to serve as one transmit queue for tuntap device. The sock_fprog and |
| 121 | * tap_filter were kept in tun_struct since they were used for filtering for the |
Rami Rosen | 36fe8c09 | 2012-11-25 22:07:40 +0000 | [diff] [blame] | 122 | * netdevice not for a specific queue (at least I didn't see the requirement for |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 123 | * this). |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 124 | * |
| 125 | * RCU usage: |
Rami Rosen | 36fe8c09 | 2012-11-25 22:07:40 +0000 | [diff] [blame] | 126 | * The tun_file and tun_struct are loosely coupled, the pointer from one to the |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 127 | * other can only be read while rcu_read_lock or rtnl_lock is held. |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 128 | */ |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 129 | struct tun_file { |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 130 | struct sock sk; |
| 131 | struct socket socket; |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 132 | struct tun_struct __rcu *tun; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 133 | struct fasync_struct *fasync; |
| 134 | /* only used for fasnyc */ |
| 135 | unsigned int flags; |
Pavel Emelyanov | fb7589a | 2013-08-21 14:31:38 +0400 | [diff] [blame] | 136 | union { |
| 137 | u16 queue_index; |
| 138 | unsigned int ifindex; |
| 139 | }; |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 140 | struct napi_struct napi; |
Eric Dumazet | aec72f3 | 2017-10-18 12:12:09 -0700 | [diff] [blame] | 141 | bool napi_enabled; |
Eric Dumazet | af3fb24 | 2018-09-28 14:51:49 -0700 | [diff] [blame] | 142 | bool napi_frags_enabled; |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 143 | struct mutex napi_mutex; /* Protects access to the above napi */ |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 144 | struct list_head next; |
| 145 | struct tun_struct *detached; |
Jason Wang | 5990a30 | 2018-01-04 11:14:27 +0800 | [diff] [blame] | 146 | struct ptr_ring tx_ring; |
Jesper Dangaard Brouer | 8bf5c4e | 2018-01-03 11:25:59 +0100 | [diff] [blame] | 147 | struct xdp_rxq_info xdp_rxq; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 148 | }; |
| 149 | |
Jason Wang | f9e06c4 | 2018-11-15 17:43:10 +0800 | [diff] [blame] | 150 | struct tun_page { |
| 151 | struct page *page; |
| 152 | int count; |
| 153 | }; |
| 154 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 155 | struct tun_flow_entry { |
| 156 | struct hlist_node hash_link; |
| 157 | struct rcu_head rcu; |
| 158 | struct tun_struct *tun; |
| 159 | |
| 160 | u32 rxhash; |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 161 | u32 rps_rxhash; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 162 | int queue_index; |
Li RongQing | 83b1bc1 | 2018-12-06 16:08:17 +0800 | [diff] [blame] | 163 | unsigned long updated ____cacheline_aligned_in_smp; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 164 | }; |
| 165 | |
| 166 | #define TUN_NUM_FLOW_ENTRIES 1024 |
Li RongQing | f13b546 | 2018-08-03 15:50:02 +0800 | [diff] [blame] | 167 | #define TUN_MASK_FLOW_ENTRIES (TUN_NUM_FLOW_ENTRIES - 1) |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 168 | |
Jason Wang | cd5681d | 2018-01-16 16:31:01 +0800 | [diff] [blame] | 169 | struct tun_prog { |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 170 | struct rcu_head rcu; |
| 171 | struct bpf_prog *prog; |
| 172 | }; |
| 173 | |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 174 | /* Since the socket were moved to tun_file, to preserve the behavior of persist |
Rami Rosen | 36fe8c09 | 2012-11-25 22:07:40 +0000 | [diff] [blame] | 175 | * device, socket filter, sndbuf and vnet header size were restore when the |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 176 | * file were attached to a persist device. |
| 177 | */ |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 178 | struct tun_struct { |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 179 | struct tun_file __rcu *tfiles[MAX_TAP_QUEUES]; |
| 180 | unsigned int numqueues; |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 181 | unsigned int flags; |
Eric W. Biederman | 0625c88 | 2012-02-07 16:48:55 -0800 | [diff] [blame] | 182 | kuid_t owner; |
| 183 | kgid_t group; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 184 | |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 185 | struct net_device *dev; |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 186 | netdev_features_t set_features; |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 187 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
David S. Miller | d591a1f | 2017-07-03 06:35:32 -0700 | [diff] [blame] | 188 | NETIF_F_TSO6) |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 189 | |
Paolo Abeni | eaea34b | 2016-02-26 10:45:40 +0100 | [diff] [blame] | 190 | int align; |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 191 | int vnet_hdr_sz; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 192 | int sndbuf; |
| 193 | struct tap_filter txflt; |
| 194 | struct sock_fprog fprog; |
| 195 | /* protected by rtnl lock */ |
| 196 | bool filter_attached; |
Michal Kubecek | 3424170 | 2020-03-04 17:24:14 +0100 | [diff] [blame] | 197 | u32 msg_enable; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 198 | spinlock_t lock; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 199 | struct hlist_head flows[TUN_NUM_FLOW_ENTRIES]; |
| 200 | struct timer_list flow_gc_timer; |
| 201 | unsigned long ageing_time; |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 202 | unsigned int numdisabled; |
| 203 | struct list_head disabled; |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 204 | void *security; |
Jason Wang | b8732fb | 2013-01-23 03:59:13 +0000 | [diff] [blame] | 205 | u32 flow_count; |
Jason Wang | 5503fce | 2017-01-18 15:02:03 +0800 | [diff] [blame] | 206 | u32 rx_batched; |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 207 | atomic_long_t rx_frame_errors; |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 208 | struct bpf_prog __rcu *xdp_prog; |
Jason Wang | cd5681d | 2018-01-16 16:31:01 +0800 | [diff] [blame] | 209 | struct tun_prog __rcu *steering_prog; |
Jason Wang | aff3d70 | 2018-01-16 16:31:02 +0800 | [diff] [blame] | 210 | struct tun_prog __rcu *filter_prog; |
Chas Williams | 4e24f2d | 2018-06-02 17:49:53 -0400 | [diff] [blame] | 211 | struct ethtool_link_ksettings link_ksettings; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 212 | }; |
| 213 | |
Jason Wang | aff3d70 | 2018-01-16 16:31:02 +0800 | [diff] [blame] | 214 | struct veth { |
| 215 | __be16 h_vlan_proto; |
| 216 | __be16 h_vlan_TCI; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | }; |
| 218 | |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 219 | static int tun_napi_receive(struct napi_struct *napi, int budget) |
| 220 | { |
| 221 | struct tun_file *tfile = container_of(napi, struct tun_file, napi); |
| 222 | struct sk_buff_head *queue = &tfile->sk.sk_write_queue; |
| 223 | struct sk_buff_head process_queue; |
| 224 | struct sk_buff *skb; |
| 225 | int received = 0; |
| 226 | |
| 227 | __skb_queue_head_init(&process_queue); |
| 228 | |
| 229 | spin_lock(&queue->lock); |
| 230 | skb_queue_splice_tail_init(queue, &process_queue); |
| 231 | spin_unlock(&queue->lock); |
| 232 | |
| 233 | while (received < budget && (skb = __skb_dequeue(&process_queue))) { |
| 234 | napi_gro_receive(napi, skb); |
| 235 | ++received; |
| 236 | } |
| 237 | |
| 238 | if (!skb_queue_empty(&process_queue)) { |
| 239 | spin_lock(&queue->lock); |
| 240 | skb_queue_splice(&process_queue, queue); |
| 241 | spin_unlock(&queue->lock); |
| 242 | } |
| 243 | |
| 244 | return received; |
| 245 | } |
| 246 | |
| 247 | static int tun_napi_poll(struct napi_struct *napi, int budget) |
| 248 | { |
| 249 | unsigned int received; |
| 250 | |
| 251 | received = tun_napi_receive(napi, budget); |
| 252 | |
| 253 | if (received < budget) |
| 254 | napi_complete_done(napi, received); |
| 255 | |
| 256 | return received; |
| 257 | } |
| 258 | |
| 259 | static void tun_napi_init(struct tun_struct *tun, struct tun_file *tfile, |
Eric Dumazet | af3fb24 | 2018-09-28 14:51:49 -0700 | [diff] [blame] | 260 | bool napi_en, bool napi_frags) |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 261 | { |
Eric Dumazet | aec72f3 | 2017-10-18 12:12:09 -0700 | [diff] [blame] | 262 | tfile->napi_enabled = napi_en; |
Eric Dumazet | af3fb24 | 2018-09-28 14:51:49 -0700 | [diff] [blame] | 263 | tfile->napi_frags_enabled = napi_en && napi_frags; |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 264 | if (napi_en) { |
Petar Penkov | c39e342 | 2019-11-14 09:52:09 -0800 | [diff] [blame] | 265 | netif_tx_napi_add(tun->dev, &tfile->napi, tun_napi_poll, |
| 266 | NAPI_POLL_WEIGHT); |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 267 | napi_enable(&tfile->napi); |
| 268 | } |
| 269 | } |
| 270 | |
Eric Dumazet | 06e55ad | 2018-09-28 14:51:47 -0700 | [diff] [blame] | 271 | static void tun_napi_disable(struct tun_file *tfile) |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 272 | { |
Eric Dumazet | aec72f3 | 2017-10-18 12:12:09 -0700 | [diff] [blame] | 273 | if (tfile->napi_enabled) |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 274 | napi_disable(&tfile->napi); |
| 275 | } |
| 276 | |
Eric Dumazet | 06e55ad | 2018-09-28 14:51:47 -0700 | [diff] [blame] | 277 | static void tun_napi_del(struct tun_file *tfile) |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 278 | { |
Eric Dumazet | aec72f3 | 2017-10-18 12:12:09 -0700 | [diff] [blame] | 279 | if (tfile->napi_enabled) |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 280 | netif_napi_del(&tfile->napi); |
| 281 | } |
| 282 | |
Eric Dumazet | af3fb24 | 2018-09-28 14:51:49 -0700 | [diff] [blame] | 283 | static bool tun_napi_frags_enabled(const struct tun_file *tfile) |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 284 | { |
Eric Dumazet | af3fb24 | 2018-09-28 14:51:49 -0700 | [diff] [blame] | 285 | return tfile->napi_frags_enabled; |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 286 | } |
| 287 | |
Greg Kurz | 8b8e658 | 2015-04-24 14:50:36 +0200 | [diff] [blame] | 288 | #ifdef CONFIG_TUN_VNET_CROSS_LE |
| 289 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) |
| 290 | { |
| 291 | return tun->flags & TUN_VNET_BE ? false : |
| 292 | virtio_legacy_is_little_endian(); |
| 293 | } |
| 294 | |
| 295 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) |
| 296 | { |
| 297 | int be = !!(tun->flags & TUN_VNET_BE); |
| 298 | |
| 299 | if (put_user(be, argp)) |
| 300 | return -EFAULT; |
| 301 | |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) |
| 306 | { |
| 307 | int be; |
| 308 | |
| 309 | if (get_user(be, argp)) |
| 310 | return -EFAULT; |
| 311 | |
| 312 | if (be) |
| 313 | tun->flags |= TUN_VNET_BE; |
| 314 | else |
| 315 | tun->flags &= ~TUN_VNET_BE; |
| 316 | |
| 317 | return 0; |
| 318 | } |
| 319 | #else |
| 320 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) |
| 321 | { |
| 322 | return virtio_legacy_is_little_endian(); |
| 323 | } |
| 324 | |
| 325 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) |
| 326 | { |
| 327 | return -EINVAL; |
| 328 | } |
| 329 | |
| 330 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) |
| 331 | { |
| 332 | return -EINVAL; |
| 333 | } |
| 334 | #endif /* CONFIG_TUN_VNET_CROSS_LE */ |
| 335 | |
Greg Kurz | 25bd55bb | 2015-04-24 14:24:38 +0200 | [diff] [blame] | 336 | static inline bool tun_is_little_endian(struct tun_struct *tun) |
| 337 | { |
Greg Kurz | 7d82410 | 2015-04-24 14:26:24 +0200 | [diff] [blame] | 338 | return tun->flags & TUN_VNET_LE || |
Greg Kurz | 8b8e658 | 2015-04-24 14:50:36 +0200 | [diff] [blame] | 339 | tun_legacy_is_little_endian(tun); |
Greg Kurz | 25bd55bb | 2015-04-24 14:24:38 +0200 | [diff] [blame] | 340 | } |
| 341 | |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 342 | static inline u16 tun16_to_cpu(struct tun_struct *tun, __virtio16 val) |
| 343 | { |
Greg Kurz | 25bd55bb | 2015-04-24 14:24:38 +0200 | [diff] [blame] | 344 | return __virtio16_to_cpu(tun_is_little_endian(tun), val); |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 345 | } |
| 346 | |
| 347 | static inline __virtio16 cpu_to_tun16(struct tun_struct *tun, u16 val) |
| 348 | { |
Greg Kurz | 25bd55bb | 2015-04-24 14:24:38 +0200 | [diff] [blame] | 349 | return __cpu_to_virtio16(tun_is_little_endian(tun), val); |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 350 | } |
| 351 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 352 | static inline u32 tun_hashfn(u32 rxhash) |
| 353 | { |
Li RongQing | f13b546 | 2018-08-03 15:50:02 +0800 | [diff] [blame] | 354 | return rxhash & TUN_MASK_FLOW_ENTRIES; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 355 | } |
| 356 | |
| 357 | static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) |
| 358 | { |
| 359 | struct tun_flow_entry *e; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 360 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 361 | hlist_for_each_entry_rcu(e, head, hash_link) { |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 362 | if (e->rxhash == rxhash) |
| 363 | return e; |
| 364 | } |
| 365 | return NULL; |
| 366 | } |
| 367 | |
| 368 | static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, |
| 369 | struct hlist_head *head, |
| 370 | u32 rxhash, u16 queue_index) |
| 371 | { |
Eric Dumazet | 9fdc6be | 2012-12-21 07:17:21 +0000 | [diff] [blame] | 372 | struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); |
| 373 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 374 | if (e) { |
Michal Kubecek | 3424170 | 2020-03-04 17:24:14 +0100 | [diff] [blame] | 375 | netif_info(tun, tx_queued, tun->dev, |
| 376 | "create flow: hash %u index %u\n", |
| 377 | rxhash, queue_index); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 378 | e->updated = jiffies; |
| 379 | e->rxhash = rxhash; |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 380 | e->rps_rxhash = 0; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 381 | e->queue_index = queue_index; |
| 382 | e->tun = tun; |
| 383 | hlist_add_head_rcu(&e->hash_link, head); |
Jason Wang | b8732fb | 2013-01-23 03:59:13 +0000 | [diff] [blame] | 384 | ++tun->flow_count; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 385 | } |
| 386 | return e; |
| 387 | } |
| 388 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 389 | static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) |
| 390 | { |
Michal Kubecek | 3424170 | 2020-03-04 17:24:14 +0100 | [diff] [blame] | 391 | netif_info(tun, tx_queued, tun->dev, "delete flow: hash %u index %u\n", |
| 392 | e->rxhash, e->queue_index); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 393 | hlist_del_rcu(&e->hash_link); |
Eric Dumazet | 9fdc6be | 2012-12-21 07:17:21 +0000 | [diff] [blame] | 394 | kfree_rcu(e, rcu); |
Jason Wang | b8732fb | 2013-01-23 03:59:13 +0000 | [diff] [blame] | 395 | --tun->flow_count; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 396 | } |
| 397 | |
| 398 | static void tun_flow_flush(struct tun_struct *tun) |
| 399 | { |
| 400 | int i; |
| 401 | |
| 402 | spin_lock_bh(&tun->lock); |
| 403 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { |
| 404 | struct tun_flow_entry *e; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 405 | struct hlist_node *n; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 406 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 407 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 408 | tun_flow_delete(tun, e); |
| 409 | } |
| 410 | spin_unlock_bh(&tun->lock); |
| 411 | } |
| 412 | |
| 413 | static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) |
| 414 | { |
| 415 | int i; |
| 416 | |
| 417 | spin_lock_bh(&tun->lock); |
| 418 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { |
| 419 | struct tun_flow_entry *e; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 420 | struct hlist_node *n; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 421 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 422 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 423 | if (e->queue_index == queue_index) |
| 424 | tun_flow_delete(tun, e); |
| 425 | } |
| 426 | } |
| 427 | spin_unlock_bh(&tun->lock); |
| 428 | } |
| 429 | |
Kees Cook | e99e88a | 2017-10-16 14:43:17 -0700 | [diff] [blame] | 430 | static void tun_flow_cleanup(struct timer_list *t) |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 431 | { |
Kees Cook | e99e88a | 2017-10-16 14:43:17 -0700 | [diff] [blame] | 432 | struct tun_struct *tun = from_timer(tun, t, flow_gc_timer); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 433 | unsigned long delay = tun->ageing_time; |
| 434 | unsigned long next_timer = jiffies + delay; |
| 435 | unsigned long count = 0; |
| 436 | int i; |
| 437 | |
Eric Dumazet | 7dbfb4e | 2017-10-20 11:29:55 -0700 | [diff] [blame] | 438 | spin_lock(&tun->lock); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 439 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { |
| 440 | struct tun_flow_entry *e; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 441 | struct hlist_node *n; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 442 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 443 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 444 | unsigned long this_timer; |
Eric Dumazet | 81d98fa | 2017-10-20 11:29:56 -0700 | [diff] [blame] | 445 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 446 | this_timer = e->updated + delay; |
Eric Dumazet | 81d98fa | 2017-10-20 11:29:56 -0700 | [diff] [blame] | 447 | if (time_before_eq(this_timer, jiffies)) { |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 448 | tun_flow_delete(tun, e); |
Eric Dumazet | 81d98fa | 2017-10-20 11:29:56 -0700 | [diff] [blame] | 449 | continue; |
| 450 | } |
| 451 | count++; |
| 452 | if (time_before(this_timer, next_timer)) |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 453 | next_timer = this_timer; |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | if (count) |
| 458 | mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); |
Eric Dumazet | 7dbfb4e | 2017-10-20 11:29:55 -0700 | [diff] [blame] | 459 | spin_unlock(&tun->lock); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 460 | } |
| 461 | |
Eric Dumazet | 4997442 | 2012-12-12 19:22:57 +0000 | [diff] [blame] | 462 | static void tun_flow_update(struct tun_struct *tun, u32 rxhash, |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 463 | struct tun_file *tfile) |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 464 | { |
| 465 | struct hlist_head *head; |
| 466 | struct tun_flow_entry *e; |
| 467 | unsigned long delay = tun->ageing_time; |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 468 | u16 queue_index = tfile->queue_index; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 469 | |
Li RongQing | 5c327f6 | 2018-12-06 16:28:11 +0800 | [diff] [blame] | 470 | head = &tun->flows[tun_hashfn(rxhash)]; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 471 | |
| 472 | rcu_read_lock(); |
| 473 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 474 | e = tun_flow_find(head, rxhash); |
| 475 | if (likely(e)) { |
| 476 | /* TODO: keep queueing to old queue until it's empty? */ |
Eric Dumazet | 4ffdd22 | 2019-10-09 09:20:02 -0700 | [diff] [blame] | 477 | if (READ_ONCE(e->queue_index) != queue_index) |
| 478 | WRITE_ONCE(e->queue_index, queue_index); |
Li RongQing | 83b1bc1 | 2018-12-06 16:08:17 +0800 | [diff] [blame] | 479 | if (e->updated != jiffies) |
| 480 | e->updated = jiffies; |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 481 | sock_rps_record_flow_hash(e->rps_rxhash); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 482 | } else { |
| 483 | spin_lock_bh(&tun->lock); |
Jason Wang | b8732fb | 2013-01-23 03:59:13 +0000 | [diff] [blame] | 484 | if (!tun_flow_find(head, rxhash) && |
| 485 | tun->flow_count < MAX_TAP_FLOWS) |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 486 | tun_flow_create(tun, head, rxhash, queue_index); |
| 487 | |
| 488 | if (!timer_pending(&tun->flow_gc_timer)) |
| 489 | mod_timer(&tun->flow_gc_timer, |
| 490 | round_jiffies_up(jiffies + delay)); |
| 491 | spin_unlock_bh(&tun->lock); |
| 492 | } |
| 493 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 494 | rcu_read_unlock(); |
| 495 | } |
| 496 | |
Michal Kubecek | 516c512 | 2020-03-04 17:23:59 +0100 | [diff] [blame] | 497 | /* Save the hash received in the stack receive path and update the |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 498 | * flow_hash table accordingly. |
| 499 | */ |
| 500 | static inline void tun_flow_save_rps_rxhash(struct tun_flow_entry *e, u32 hash) |
| 501 | { |
Eric Dumazet | 567e4b7 | 2015-02-06 12:59:01 -0800 | [diff] [blame] | 502 | if (unlikely(e->rps_rxhash != hash)) |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 503 | e->rps_rxhash = hash; |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 504 | } |
| 505 | |
Wang Li | 4b03527 | 2018-10-09 10:32:04 +0800 | [diff] [blame] | 506 | /* We try to identify a flow through its rxhash. The reason that |
stephen hemminger | 92d4ea6 | 2013-12-05 20:42:58 -0800 | [diff] [blame] | 507 | * we do not check rxq no. is because some cards(e.g 82599), chooses |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 508 | * the rxq based on the txq where the last packet of the flow comes. As |
| 509 | * the userspace application move between processors, we may get a |
Wang Li | 4b03527 | 2018-10-09 10:32:04 +0800 | [diff] [blame] | 510 | * different rxq no. here. |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 511 | */ |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 512 | static u16 tun_automq_select_queue(struct tun_struct *tun, struct sk_buff *skb) |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 513 | { |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 514 | struct tun_flow_entry *e; |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 515 | u32 txq = 0; |
| 516 | u32 numqueues = 0; |
| 517 | |
Mark Rutland | 6aa7de0 | 2017-10-23 14:07:29 -0700 | [diff] [blame] | 518 | numqueues = READ_ONCE(tun->numqueues); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 519 | |
Jason Wang | feec084 | 2017-06-06 14:09:49 +0800 | [diff] [blame] | 520 | txq = __skb_get_hash_symmetric(skb); |
Wang Li | 4b03527 | 2018-10-09 10:32:04 +0800 | [diff] [blame] | 521 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
| 522 | if (e) { |
| 523 | tun_flow_save_rps_rxhash(e, txq); |
| 524 | txq = e->queue_index; |
| 525 | } else { |
| 526 | /* use multiply and shift instead of expensive divide */ |
| 527 | txq = ((u64)txq * numqueues) >> 32; |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 528 | } |
| 529 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 530 | return txq; |
| 531 | } |
| 532 | |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 533 | static u16 tun_ebpf_select_queue(struct tun_struct *tun, struct sk_buff *skb) |
| 534 | { |
Jason Wang | cd5681d | 2018-01-16 16:31:01 +0800 | [diff] [blame] | 535 | struct tun_prog *prog; |
Jason Wang | a35d310 | 2019-05-08 23:20:17 -0400 | [diff] [blame] | 536 | u32 numqueues; |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 537 | u16 ret = 0; |
| 538 | |
Jason Wang | a35d310 | 2019-05-08 23:20:17 -0400 | [diff] [blame] | 539 | numqueues = READ_ONCE(tun->numqueues); |
| 540 | if (!numqueues) |
| 541 | return 0; |
| 542 | |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 543 | prog = rcu_dereference(tun->steering_prog); |
| 544 | if (prog) |
| 545 | ret = bpf_prog_run_clear_cb(prog->prog, skb); |
| 546 | |
Jason Wang | a35d310 | 2019-05-08 23:20:17 -0400 | [diff] [blame] | 547 | return ret % numqueues; |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 548 | } |
| 549 | |
| 550 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb, |
Paolo Abeni | a350ecc | 2019-03-20 11:02:06 +0100 | [diff] [blame] | 551 | struct net_device *sb_dev) |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 552 | { |
| 553 | struct tun_struct *tun = netdev_priv(dev); |
| 554 | u16 ret; |
| 555 | |
| 556 | rcu_read_lock(); |
| 557 | if (rcu_dereference(tun->steering_prog)) |
| 558 | ret = tun_ebpf_select_queue(tun, skb); |
| 559 | else |
| 560 | ret = tun_automq_select_queue(tun, skb); |
| 561 | rcu_read_unlock(); |
| 562 | |
| 563 | return ret; |
| 564 | } |
| 565 | |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 566 | static inline bool tun_not_capable(struct tun_struct *tun) |
| 567 | { |
| 568 | const struct cred *cred = current_cred(); |
Eric W. Biederman | c260b77 | 2012-11-18 21:34:11 +0000 | [diff] [blame] | 569 | struct net *net = dev_net(tun->dev); |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 570 | |
| 571 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || |
| 572 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && |
Eric W. Biederman | c260b77 | 2012-11-18 21:34:11 +0000 | [diff] [blame] | 573 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 574 | } |
| 575 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 576 | static void tun_set_real_num_queues(struct tun_struct *tun) |
| 577 | { |
| 578 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); |
| 579 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); |
| 580 | } |
| 581 | |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 582 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
| 583 | { |
| 584 | tfile->detached = tun; |
| 585 | list_add_tail(&tfile->next, &tun->disabled); |
| 586 | ++tun->numdisabled; |
| 587 | } |
| 588 | |
Jason Wang | d32649d | 2012-12-18 11:00:27 +0800 | [diff] [blame] | 589 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 590 | { |
| 591 | struct tun_struct *tun = tfile->detached; |
| 592 | |
| 593 | tfile->detached = NULL; |
| 594 | list_del_init(&tfile->next); |
| 595 | --tun->numdisabled; |
| 596 | return tun; |
| 597 | } |
| 598 | |
Jason Wang | 3a40307 | 2018-03-09 14:50:34 +0800 | [diff] [blame] | 599 | void tun_ptr_free(void *ptr) |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 600 | { |
| 601 | if (!ptr) |
| 602 | return; |
Jesper Dangaard Brouer | 1ffcbc8 | 2018-04-17 16:45:47 +0200 | [diff] [blame] | 603 | if (tun_is_xdp_frame(ptr)) { |
| 604 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 605 | |
Jesper Dangaard Brouer | 0399309 | 2018-04-17 16:46:32 +0200 | [diff] [blame] | 606 | xdp_return_frame(xdpf); |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 607 | } else { |
| 608 | __skb_array_destroy_skb(ptr); |
| 609 | } |
| 610 | } |
Jason Wang | 3a40307 | 2018-03-09 14:50:34 +0800 | [diff] [blame] | 611 | EXPORT_SYMBOL_GPL(tun_ptr_free); |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 612 | |
Jason Wang | 4bfb051 | 2013-09-05 17:53:59 +0800 | [diff] [blame] | 613 | static void tun_queue_purge(struct tun_file *tfile) |
| 614 | { |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 615 | void *ptr; |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 616 | |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 617 | while ((ptr = ptr_ring_consume(&tfile->tx_ring)) != NULL) |
| 618 | tun_ptr_free(ptr); |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 619 | |
Jason Wang | 5503fce | 2017-01-18 15:02:03 +0800 | [diff] [blame] | 620 | skb_queue_purge(&tfile->sk.sk_write_queue); |
Jason Wang | 4bfb051 | 2013-09-05 17:53:59 +0800 | [diff] [blame] | 621 | skb_queue_purge(&tfile->sk.sk_error_queue); |
| 622 | } |
| 623 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 624 | static void __tun_detach(struct tun_file *tfile, bool clean) |
| 625 | { |
| 626 | struct tun_file *ntfile; |
| 627 | struct tun_struct *tun; |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 628 | |
Jason Wang | b8deabd | 2013-01-11 16:59:32 +0000 | [diff] [blame] | 629 | tun = rtnl_dereference(tfile->tun); |
| 630 | |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 631 | if (tun && clean) { |
Eric Dumazet | 06e55ad | 2018-09-28 14:51:47 -0700 | [diff] [blame] | 632 | tun_napi_disable(tfile); |
| 633 | tun_napi_del(tfile); |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 634 | } |
| 635 | |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 636 | if (tun && !tfile->detached) { |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 637 | u16 index = tfile->queue_index; |
| 638 | BUG_ON(index >= tun->numqueues); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 639 | |
| 640 | rcu_assign_pointer(tun->tfiles[index], |
| 641 | tun->tfiles[tun->numqueues - 1]); |
Jason Wang | b8deabd | 2013-01-11 16:59:32 +0000 | [diff] [blame] | 642 | ntfile = rtnl_dereference(tun->tfiles[index]); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 643 | ntfile->queue_index = index; |
Jason Wang | 9871a9e | 2019-05-08 23:20:18 -0400 | [diff] [blame] | 644 | rcu_assign_pointer(tun->tfiles[tun->numqueues - 1], |
| 645 | NULL); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 646 | |
| 647 | --tun->numqueues; |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 648 | if (clean) { |
Monam Agarwal | c956674 | 2014-03-24 00:02:32 +0530 | [diff] [blame] | 649 | RCU_INIT_POINTER(tfile->tun, NULL); |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 650 | sock_put(&tfile->sk); |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 651 | } else |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 652 | tun_disable_queue(tun, tfile); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 653 | |
| 654 | synchronize_net(); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 655 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 656 | /* Drop read queue */ |
Jason Wang | 4bfb051 | 2013-09-05 17:53:59 +0800 | [diff] [blame] | 657 | tun_queue_purge(tfile); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 658 | tun_set_real_num_queues(tun); |
Jason Wang | dd38bd8 | 2013-01-11 16:59:34 +0000 | [diff] [blame] | 659 | } else if (tfile->detached && clean) { |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 660 | tun = tun_enable_queue(tfile); |
Jason Wang | dd38bd8 | 2013-01-11 16:59:34 +0000 | [diff] [blame] | 661 | sock_put(&tfile->sk); |
| 662 | } |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 663 | |
| 664 | if (clean) { |
Michael S. Tsirkin | af668b3 | 2013-01-28 00:38:02 +0000 | [diff] [blame] | 665 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0) { |
| 666 | netif_carrier_off(tun->dev); |
| 667 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 668 | if (!(tun->flags & IFF_PERSIST) && |
Michael S. Tsirkin | af668b3 | 2013-01-28 00:38:02 +0000 | [diff] [blame] | 669 | tun->dev->reg_state == NETREG_REGISTERED) |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 670 | unregister_netdevice(tun->dev); |
Michael S. Tsirkin | af668b3 | 2013-01-28 00:38:02 +0000 | [diff] [blame] | 671 | } |
Jason Wang | b196d88 | 2018-05-11 10:49:25 +0800 | [diff] [blame] | 672 | if (tun) |
| 673 | xdp_rxq_info_unreg(&tfile->xdp_rxq); |
Jason Wang | 7063efd | 2018-05-16 20:39:33 +0800 | [diff] [blame] | 674 | ptr_ring_cleanup(&tfile->tx_ring, tun_ptr_free); |
Eric W. Biederman | 140e807da | 2015-05-08 21:07:08 -0500 | [diff] [blame] | 675 | sock_put(&tfile->sk); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 676 | } |
| 677 | } |
| 678 | |
| 679 | static void tun_detach(struct tun_file *tfile, bool clean) |
| 680 | { |
Sabrina Dubroca | 83c1f36 | 2018-04-10 16:28:56 +0200 | [diff] [blame] | 681 | struct tun_struct *tun; |
| 682 | struct net_device *dev; |
| 683 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 684 | rtnl_lock(); |
Sabrina Dubroca | 83c1f36 | 2018-04-10 16:28:56 +0200 | [diff] [blame] | 685 | tun = rtnl_dereference(tfile->tun); |
| 686 | dev = tun ? tun->dev : NULL; |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 687 | __tun_detach(tfile, clean); |
Sabrina Dubroca | 83c1f36 | 2018-04-10 16:28:56 +0200 | [diff] [blame] | 688 | if (dev) |
| 689 | netdev_state_change(dev); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 690 | rtnl_unlock(); |
| 691 | } |
| 692 | |
| 693 | static void tun_detach_all(struct net_device *dev) |
| 694 | { |
| 695 | struct tun_struct *tun = netdev_priv(dev); |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 696 | struct tun_file *tfile, *tmp; |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 697 | int i, n = tun->numqueues; |
| 698 | |
| 699 | for (i = 0; i < n; i++) { |
Jason Wang | b8deabd | 2013-01-11 16:59:32 +0000 | [diff] [blame] | 700 | tfile = rtnl_dereference(tun->tfiles[i]); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 701 | BUG_ON(!tfile); |
Eric Dumazet | 06e55ad | 2018-09-28 14:51:47 -0700 | [diff] [blame] | 702 | tun_napi_disable(tfile); |
Jason Wang | addf8fc | 2016-05-19 13:36:51 +0800 | [diff] [blame] | 703 | tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; |
Xi Wang | 9e641bd | 2014-05-16 15:11:48 -0700 | [diff] [blame] | 704 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
Monam Agarwal | c956674 | 2014-03-24 00:02:32 +0530 | [diff] [blame] | 705 | RCU_INIT_POINTER(tfile->tun, NULL); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 706 | --tun->numqueues; |
| 707 | } |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 708 | list_for_each_entry(tfile, &tun->disabled, next) { |
Jason Wang | addf8fc | 2016-05-19 13:36:51 +0800 | [diff] [blame] | 709 | tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; |
Xi Wang | 9e641bd | 2014-05-16 15:11:48 -0700 | [diff] [blame] | 710 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
Monam Agarwal | c956674 | 2014-03-24 00:02:32 +0530 | [diff] [blame] | 711 | RCU_INIT_POINTER(tfile->tun, NULL); |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 712 | } |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 713 | BUG_ON(tun->numqueues != 0); |
| 714 | |
| 715 | synchronize_net(); |
| 716 | for (i = 0; i < n; i++) { |
Jason Wang | b8deabd | 2013-01-11 16:59:32 +0000 | [diff] [blame] | 717 | tfile = rtnl_dereference(tun->tfiles[i]); |
Eric Dumazet | 06e55ad | 2018-09-28 14:51:47 -0700 | [diff] [blame] | 718 | tun_napi_del(tfile); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 719 | /* Drop read queue */ |
Jason Wang | 4bfb051 | 2013-09-05 17:53:59 +0800 | [diff] [blame] | 720 | tun_queue_purge(tfile); |
Jason Wang | b196d88 | 2018-05-11 10:49:25 +0800 | [diff] [blame] | 721 | xdp_rxq_info_unreg(&tfile->xdp_rxq); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 722 | sock_put(&tfile->sk); |
| 723 | } |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 724 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
| 725 | tun_enable_queue(tfile); |
Jason Wang | 4bfb051 | 2013-09-05 17:53:59 +0800 | [diff] [blame] | 726 | tun_queue_purge(tfile); |
Jason Wang | b196d88 | 2018-05-11 10:49:25 +0800 | [diff] [blame] | 727 | xdp_rxq_info_unreg(&tfile->xdp_rxq); |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 728 | sock_put(&tfile->sk); |
| 729 | } |
| 730 | BUG_ON(tun->numdisabled != 0); |
Jason Wang | dd38bd8 | 2013-01-11 16:59:34 +0000 | [diff] [blame] | 731 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 732 | if (tun->flags & IFF_PERSIST) |
Jason Wang | dd38bd8 | 2013-01-11 16:59:34 +0000 | [diff] [blame] | 733 | module_put(THIS_MODULE); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 734 | } |
| 735 | |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 736 | static int tun_attach(struct tun_struct *tun, struct file *file, |
Yang Yingliang | 77f22f9 | 2019-09-10 18:56:57 +0800 | [diff] [blame] | 737 | bool skip_filter, bool napi, bool napi_frags, |
| 738 | bool publish_tun) |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 739 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 740 | struct tun_file *tfile = file->private_data; |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 741 | struct net_device *dev = tun->dev; |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 742 | int err; |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 743 | |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 744 | err = security_tun_dev_attach(tfile->socket.sk, tun->security); |
| 745 | if (err < 0) |
| 746 | goto out; |
| 747 | |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 748 | err = -EINVAL; |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 749 | if (rtnl_dereference(tfile->tun) && !tfile->detached) |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 750 | goto out; |
| 751 | |
| 752 | err = -EBUSY; |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 753 | if (!(tun->flags & IFF_MULTI_QUEUE) && tun->numqueues == 1) |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 754 | goto out; |
| 755 | |
| 756 | err = -E2BIG; |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 757 | if (!tfile->detached && |
| 758 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 759 | goto out; |
| 760 | |
| 761 | err = 0; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 762 | |
stephen hemminger | 92d4ea6 | 2013-12-05 20:42:58 -0800 | [diff] [blame] | 763 | /* Re-attach the filter to persist device */ |
Pavel Emelyanov | 849c9b6 | 2013-08-21 14:32:21 +0400 | [diff] [blame] | 764 | if (!skip_filter && (tun->filter_attached == true)) { |
Hannes Frederic Sowa | 8ced425 | 2016-04-05 17:10:16 +0200 | [diff] [blame] | 765 | lock_sock(tfile->socket.sk); |
| 766 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
| 767 | release_sock(tfile->socket.sk); |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 768 | if (!err) |
| 769 | goto out; |
| 770 | } |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 771 | |
| 772 | if (!tfile->detached && |
Jason Wang | b196d88 | 2018-05-11 10:49:25 +0800 | [diff] [blame] | 773 | ptr_ring_resize(&tfile->tx_ring, dev->tx_queue_len, |
| 774 | GFP_KERNEL, tun_ptr_free)) { |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 775 | err = -ENOMEM; |
| 776 | goto out; |
| 777 | } |
| 778 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 779 | tfile->queue_index = tun->numqueues; |
Jason Wang | addf8fc | 2016-05-19 13:36:51 +0800 | [diff] [blame] | 780 | tfile->socket.sk->sk_shutdown &= ~RCV_SHUTDOWN; |
Jesper Dangaard Brouer | 8bf5c4e | 2018-01-03 11:25:59 +0100 | [diff] [blame] | 781 | |
| 782 | if (tfile->detached) { |
| 783 | /* Re-attach detached tfile, updating XDP queue_index */ |
| 784 | WARN_ON(!xdp_rxq_info_is_reg(&tfile->xdp_rxq)); |
| 785 | |
| 786 | if (tfile->xdp_rxq.queue_index != tfile->queue_index) |
| 787 | tfile->xdp_rxq.queue_index = tfile->queue_index; |
| 788 | } else { |
| 789 | /* Setup XDP RX-queue info, for new tfile getting attached */ |
| 790 | err = xdp_rxq_info_reg(&tfile->xdp_rxq, |
Björn Töpel | b02e5a0 | 2020-11-30 19:52:01 +0100 | [diff] [blame] | 791 | tun->dev, tfile->queue_index, 0); |
Jesper Dangaard Brouer | 8bf5c4e | 2018-01-03 11:25:59 +0100 | [diff] [blame] | 792 | if (err < 0) |
| 793 | goto out; |
Jesper Dangaard Brouer | 8d5d885 | 2018-04-17 16:46:12 +0200 | [diff] [blame] | 794 | err = xdp_rxq_info_reg_mem_model(&tfile->xdp_rxq, |
| 795 | MEM_TYPE_PAGE_SHARED, NULL); |
| 796 | if (err < 0) { |
| 797 | xdp_rxq_info_unreg(&tfile->xdp_rxq); |
| 798 | goto out; |
| 799 | } |
Jesper Dangaard Brouer | 8bf5c4e | 2018-01-03 11:25:59 +0100 | [diff] [blame] | 800 | err = 0; |
| 801 | } |
| 802 | |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 803 | if (tfile->detached) { |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 804 | tun_enable_queue(tfile); |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 805 | } else { |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 806 | sock_hold(&tfile->sk); |
Eric Dumazet | af3fb24 | 2018-09-28 14:51:49 -0700 | [diff] [blame] | 807 | tun_napi_init(tun, tfile, napi, napi_frags); |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 808 | } |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 809 | |
Jason Wang | e4a2a30 | 2018-09-12 11:16:59 +0800 | [diff] [blame] | 810 | if (rtnl_dereference(tun->xdp_prog)) |
| 811 | sock_set_flag(&tfile->sk, SOCK_XDP); |
| 812 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 813 | /* device is allowed to go away first, so no need to hold extra |
| 814 | * refcnt. |
| 815 | */ |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 816 | |
Stanislav Fomichev | 0b7959b | 2019-01-07 13:38:38 -0800 | [diff] [blame] | 817 | /* Publish tfile->tun and tun->tfiles only after we've fully |
| 818 | * initialized tfile; otherwise we risk using half-initialized |
| 819 | * object. |
| 820 | */ |
Yang Yingliang | 77f22f9 | 2019-09-10 18:56:57 +0800 | [diff] [blame] | 821 | if (publish_tun) |
| 822 | rcu_assign_pointer(tfile->tun, tun); |
Stanislav Fomichev | 0b7959b | 2019-01-07 13:38:38 -0800 | [diff] [blame] | 823 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); |
| 824 | tun->numqueues++; |
George Amanakis | 3a03cb8 | 2019-01-29 22:50:13 -0500 | [diff] [blame] | 825 | tun_set_real_num_queues(tun); |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 826 | out: |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 827 | return err; |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 828 | } |
| 829 | |
yuan linyu | 9484dc7 | 2017-09-23 22:36:52 +0800 | [diff] [blame] | 830 | static struct tun_struct *tun_get(struct tun_file *tfile) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 831 | { |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 832 | struct tun_struct *tun; |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 833 | |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 834 | rcu_read_lock(); |
| 835 | tun = rcu_dereference(tfile->tun); |
| 836 | if (tun) |
| 837 | dev_hold(tun->dev); |
| 838 | rcu_read_unlock(); |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 839 | |
| 840 | return tun; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 841 | } |
| 842 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 843 | static void tun_put(struct tun_struct *tun) |
| 844 | { |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 845 | dev_put(tun->dev); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 846 | } |
| 847 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 848 | /* TAP filtering */ |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 849 | static void addr_hash_set(u32 *mask, const u8 *addr) |
| 850 | { |
| 851 | int n = ether_crc(ETH_ALEN, addr) >> 26; |
| 852 | mask[n >> 5] |= (1 << (n & 31)); |
| 853 | } |
| 854 | |
| 855 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) |
| 856 | { |
| 857 | int n = ether_crc(ETH_ALEN, addr) >> 26; |
| 858 | return mask[n >> 5] & (1 << (n & 31)); |
| 859 | } |
| 860 | |
| 861 | static int update_filter(struct tap_filter *filter, void __user *arg) |
| 862 | { |
| 863 | struct { u8 u[ETH_ALEN]; } *addr; |
| 864 | struct tun_filter uf; |
| 865 | int err, alen, n, nexact; |
| 866 | |
| 867 | if (copy_from_user(&uf, arg, sizeof(uf))) |
| 868 | return -EFAULT; |
| 869 | |
| 870 | if (!uf.count) { |
| 871 | /* Disabled */ |
| 872 | filter->count = 0; |
| 873 | return 0; |
| 874 | } |
| 875 | |
| 876 | alen = ETH_ALEN * uf.count; |
Markus Elfring | 28e8190 | 2016-08-20 08:54:15 +0200 | [diff] [blame] | 877 | addr = memdup_user(arg + sizeof(uf), alen); |
| 878 | if (IS_ERR(addr)) |
| 879 | return PTR_ERR(addr); |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 880 | |
| 881 | /* The filter is updated without holding any locks. Which is |
| 882 | * perfectly safe. We disable it first and in the worst |
| 883 | * case we'll accept a few undesired packets. */ |
| 884 | filter->count = 0; |
| 885 | wmb(); |
| 886 | |
| 887 | /* Use first set of addresses as an exact filter */ |
| 888 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) |
| 889 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); |
| 890 | |
| 891 | nexact = n; |
| 892 | |
Alex Williamson | cfbf84f | 2009-02-08 17:49:17 -0800 | [diff] [blame] | 893 | /* Remaining multicast addresses are hashed, |
| 894 | * unicast will leave the filter disabled. */ |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 895 | memset(filter->mask, 0, sizeof(filter->mask)); |
Alex Williamson | cfbf84f | 2009-02-08 17:49:17 -0800 | [diff] [blame] | 896 | for (; n < uf.count; n++) { |
| 897 | if (!is_multicast_ether_addr(addr[n].u)) { |
| 898 | err = 0; /* no filter */ |
Markus Elfring | 3b8d2a6 | 2016-08-20 09:00:34 +0200 | [diff] [blame] | 899 | goto free_addr; |
Alex Williamson | cfbf84f | 2009-02-08 17:49:17 -0800 | [diff] [blame] | 900 | } |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 901 | addr_hash_set(filter->mask, addr[n].u); |
Alex Williamson | cfbf84f | 2009-02-08 17:49:17 -0800 | [diff] [blame] | 902 | } |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 903 | |
| 904 | /* For ALLMULTI just set the mask to all ones. |
| 905 | * This overrides the mask populated above. */ |
| 906 | if ((uf.flags & TUN_FLT_ALLMULTI)) |
| 907 | memset(filter->mask, ~0, sizeof(filter->mask)); |
| 908 | |
| 909 | /* Now enable the filter */ |
| 910 | wmb(); |
| 911 | filter->count = nexact; |
| 912 | |
| 913 | /* Return the number of exact filters */ |
| 914 | err = nexact; |
Markus Elfring | 3b8d2a6 | 2016-08-20 09:00:34 +0200 | [diff] [blame] | 915 | free_addr: |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 916 | kfree(addr); |
| 917 | return err; |
| 918 | } |
| 919 | |
| 920 | /* Returns: 0 - drop, !=0 - accept */ |
| 921 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) |
| 922 | { |
| 923 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect |
| 924 | * at this point. */ |
| 925 | struct ethhdr *eh = (struct ethhdr *) skb->data; |
| 926 | int i; |
| 927 | |
| 928 | /* Exact match */ |
| 929 | for (i = 0; i < filter->count; i++) |
Joe Perches | 2e42e47 | 2012-05-09 17:17:46 +0000 | [diff] [blame] | 930 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 931 | return 1; |
| 932 | |
| 933 | /* Inexact match (multicast only) */ |
| 934 | if (is_multicast_ether_addr(eh->h_dest)) |
| 935 | return addr_hash_test(filter->mask, eh->h_dest); |
| 936 | |
| 937 | return 0; |
| 938 | } |
| 939 | |
| 940 | /* |
| 941 | * Checks whether the packet is accepted or not. |
| 942 | * Returns: 0 - drop, !=0 - accept |
| 943 | */ |
| 944 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) |
| 945 | { |
| 946 | if (!filter->count) |
| 947 | return 1; |
| 948 | |
| 949 | return run_filter(filter, skb); |
| 950 | } |
| 951 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | /* Network device part of the driver */ |
| 953 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | static const struct ethtool_ops tun_ethtool_ops; |
| 955 | |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 956 | /* Net device detach from fd. */ |
| 957 | static void tun_net_uninit(struct net_device *dev) |
| 958 | { |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 959 | tun_detach_all(dev); |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 960 | } |
| 961 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | /* Net device open. */ |
| 963 | static int tun_net_open(struct net_device *dev) |
| 964 | { |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 965 | netif_tx_start_all_queues(dev); |
Hannes Frederic Sowa | b20e2d5 | 2017-03-13 00:00:26 +0100 | [diff] [blame] | 966 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | return 0; |
| 968 | } |
| 969 | |
| 970 | /* Net device close. */ |
| 971 | static int tun_net_close(struct net_device *dev) |
| 972 | { |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 973 | netif_tx_stop_all_queues(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | return 0; |
| 975 | } |
| 976 | |
| 977 | /* Net device start xmit */ |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 978 | static void tun_automq_xmit(struct tun_struct *tun, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | { |
Jason Wang | 3df97ba | 2016-04-25 23:13:42 -0400 | [diff] [blame] | 980 | #ifdef CONFIG_RPS |
Eric Dumazet | dc05360 | 2019-03-22 08:56:38 -0700 | [diff] [blame] | 981 | if (tun->numqueues == 1 && static_branch_unlikely(&rps_needed)) { |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 982 | /* Select queue was not called for the skbuff, so we extract the |
| 983 | * RPS hash and save it into the flow_table here. |
| 984 | */ |
Wang Li | 4b03527 | 2018-10-09 10:32:04 +0800 | [diff] [blame] | 985 | struct tun_flow_entry *e; |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 986 | __u32 rxhash; |
| 987 | |
Jason Wang | feec084 | 2017-06-06 14:09:49 +0800 | [diff] [blame] | 988 | rxhash = __skb_get_hash_symmetric(skb); |
Wang Li | 4b03527 | 2018-10-09 10:32:04 +0800 | [diff] [blame] | 989 | e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], rxhash); |
| 990 | if (e) |
| 991 | tun_flow_save_rps_rxhash(e, rxhash); |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 992 | } |
Jason Wang | 3df97ba | 2016-04-25 23:13:42 -0400 | [diff] [blame] | 993 | #endif |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 994 | } |
| 995 | |
Jason Wang | aff3d70 | 2018-01-16 16:31:02 +0800 | [diff] [blame] | 996 | static unsigned int run_ebpf_filter(struct tun_struct *tun, |
| 997 | struct sk_buff *skb, |
| 998 | int len) |
| 999 | { |
| 1000 | struct tun_prog *prog = rcu_dereference(tun->filter_prog); |
| 1001 | |
| 1002 | if (prog) |
| 1003 | len = bpf_prog_run_clear_cb(prog->prog, skb); |
| 1004 | |
| 1005 | return len; |
| 1006 | } |
| 1007 | |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 1008 | /* Net device start xmit */ |
| 1009 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
| 1010 | { |
| 1011 | struct tun_struct *tun = netdev_priv(dev); |
| 1012 | int txq = skb->queue_mapping; |
| 1013 | struct tun_file *tfile; |
Jason Wang | aff3d70 | 2018-01-16 16:31:02 +0800 | [diff] [blame] | 1014 | int len = skb->len; |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 1015 | |
| 1016 | rcu_read_lock(); |
| 1017 | tfile = rcu_dereference(tun->tfiles[txq]); |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 1018 | |
| 1019 | /* Drop packet if interface is not attached */ |
Jason Wang | 9871a9e | 2019-05-08 23:20:18 -0400 | [diff] [blame] | 1020 | if (!tfile) |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 1021 | goto drop; |
| 1022 | |
| 1023 | if (!rcu_dereference(tun->steering_prog)) |
| 1024 | tun_automq_xmit(tun, skb); |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 1025 | |
Michal Kubecek | 3424170 | 2020-03-04 17:24:14 +0100 | [diff] [blame] | 1026 | netif_info(tun, tx_queued, tun->dev, "%s %d\n", __func__, skb->len); |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 1027 | |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1028 | /* Drop if the filter does not like it. |
| 1029 | * This is a noop if the filter is disabled. |
| 1030 | * Filter can be enabled only for the TAP devices. */ |
| 1031 | if (!check_filter(&tun->txflt, skb)) |
| 1032 | goto drop; |
| 1033 | |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1034 | if (tfile->socket.sk->sk_filter && |
| 1035 | sk_filter(tfile->socket.sk, skb)) |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 1036 | goto drop; |
| 1037 | |
Jason Wang | aff3d70 | 2018-01-16 16:31:02 +0800 | [diff] [blame] | 1038 | len = run_ebpf_filter(tun, skb, len); |
Bjørn Mork | 81c8950 | 2018-04-17 22:46:38 +0200 | [diff] [blame] | 1039 | if (len == 0 || pskb_trim(skb, len)) |
Jason Wang | aff3d70 | 2018-01-16 16:31:02 +0800 | [diff] [blame] | 1040 | goto drop; |
| 1041 | |
Willem de Bruijn | 1f8b977 | 2017-08-03 16:29:41 -0400 | [diff] [blame] | 1042 | if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
Jason Wang | 7bf6630 | 2013-09-05 17:54:00 +0800 | [diff] [blame] | 1043 | goto drop; |
| 1044 | |
Soheil Hassas Yeganeh | 7b99624 | 2016-08-23 18:22:33 -0400 | [diff] [blame] | 1045 | skb_tx_timestamp(skb); |
Richard Cochran | eda2977 | 2013-07-19 19:40:10 +0200 | [diff] [blame] | 1046 | |
Michael S. Tsirkin | 0110d6f | 2010-04-13 04:59:44 +0000 | [diff] [blame] | 1047 | /* Orphan the skb - required as we might hang on to it |
Jason Wang | 7bf6630 | 2013-09-05 17:54:00 +0800 | [diff] [blame] | 1048 | * for indefinite time. |
| 1049 | */ |
Michael S. Tsirkin | 0110d6f | 2010-04-13 04:59:44 +0000 | [diff] [blame] | 1050 | skb_orphan(skb); |
| 1051 | |
Florian Westphal | 895b5c9 | 2019-09-29 20:54:03 +0200 | [diff] [blame] | 1052 | nf_reset_ct(skb); |
Eric Dumazet | f8af75f | 2013-03-06 11:02:37 +0000 | [diff] [blame] | 1053 | |
Jason Wang | 5990a30 | 2018-01-04 11:14:27 +0800 | [diff] [blame] | 1054 | if (ptr_ring_produce(&tfile->tx_ring, skb)) |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 1055 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | |
| 1057 | /* Notify and wake up reader process */ |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1058 | if (tfile->flags & TUN_FASYNC) |
| 1059 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); |
Xi Wang | 9e641bd | 2014-05-16 15:11:48 -0700 | [diff] [blame] | 1060 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 1061 | |
| 1062 | rcu_read_unlock(); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 1063 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | |
| 1065 | drop: |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 1066 | atomic_long_inc(&dev->tx_dropped); |
Michael S. Tsirkin | 149d36f | 2012-11-01 09:16:32 +0000 | [diff] [blame] | 1067 | skb_tx_error(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | kfree_skb(skb); |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 1069 | rcu_read_unlock(); |
Jason Wang | baeabab | 2014-11-18 13:20:41 +0800 | [diff] [blame] | 1070 | return NET_XMIT_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | } |
| 1072 | |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1073 | static void tun_net_mclist(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | { |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1075 | /* |
| 1076 | * This callback is supposed to deal with mc filter in |
| 1077 | * _rx_ path and has nothing to do with the _tx_ path. |
| 1078 | * In rx path we always accept everything userspace gives us. |
| 1079 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | } |
| 1081 | |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 1082 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
| 1083 | netdev_features_t features) |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 1084 | { |
| 1085 | struct tun_struct *tun = netdev_priv(dev); |
| 1086 | |
| 1087 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); |
| 1088 | } |
Paolo Abeni | eaea34b | 2016-02-26 10:45:40 +0100 | [diff] [blame] | 1089 | |
| 1090 | static void tun_set_headroom(struct net_device *dev, int new_hr) |
| 1091 | { |
| 1092 | struct tun_struct *tun = netdev_priv(dev); |
| 1093 | |
| 1094 | if (new_hr < NET_SKB_PAD) |
| 1095 | new_hr = NET_SKB_PAD; |
| 1096 | |
| 1097 | tun->align = new_hr; |
| 1098 | } |
| 1099 | |
stephen hemminger | bc1f447 | 2017-01-06 19:12:52 -0800 | [diff] [blame] | 1100 | static void |
Paolo Abeni | 608b997 | 2016-04-13 10:52:20 +0200 | [diff] [blame] | 1101 | tun_net_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) |
| 1102 | { |
Paolo Abeni | 608b997 | 2016-04-13 10:52:20 +0200 | [diff] [blame] | 1103 | struct tun_struct *tun = netdev_priv(dev); |
Paolo Abeni | 608b997 | 2016-04-13 10:52:20 +0200 | [diff] [blame] | 1104 | |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 1105 | dev_get_tstats64(dev, stats); |
Paolo Abeni | 608b997 | 2016-04-13 10:52:20 +0200 | [diff] [blame] | 1106 | |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 1107 | stats->rx_frame_errors += |
| 1108 | (unsigned long)atomic_long_read(&tun->rx_frame_errors); |
Paolo Abeni | 608b997 | 2016-04-13 10:52:20 +0200 | [diff] [blame] | 1109 | } |
| 1110 | |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1111 | static int tun_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
| 1112 | struct netlink_ext_ack *extack) |
| 1113 | { |
| 1114 | struct tun_struct *tun = netdev_priv(dev); |
Jason Wang | e4a2a30 | 2018-09-12 11:16:59 +0800 | [diff] [blame] | 1115 | struct tun_file *tfile; |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1116 | struct bpf_prog *old_prog; |
Jason Wang | e4a2a30 | 2018-09-12 11:16:59 +0800 | [diff] [blame] | 1117 | int i; |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1118 | |
| 1119 | old_prog = rtnl_dereference(tun->xdp_prog); |
| 1120 | rcu_assign_pointer(tun->xdp_prog, prog); |
| 1121 | if (old_prog) |
| 1122 | bpf_prog_put(old_prog); |
| 1123 | |
Jason Wang | e4a2a30 | 2018-09-12 11:16:59 +0800 | [diff] [blame] | 1124 | for (i = 0; i < tun->numqueues; i++) { |
| 1125 | tfile = rtnl_dereference(tun->tfiles[i]); |
| 1126 | if (prog) |
| 1127 | sock_set_flag(&tfile->sk, SOCK_XDP); |
| 1128 | else |
| 1129 | sock_reset_flag(&tfile->sk, SOCK_XDP); |
| 1130 | } |
| 1131 | list_for_each_entry(tfile, &tun->disabled, next) { |
| 1132 | if (prog) |
| 1133 | sock_set_flag(&tfile->sk, SOCK_XDP); |
| 1134 | else |
| 1135 | sock_reset_flag(&tfile->sk, SOCK_XDP); |
| 1136 | } |
| 1137 | |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1138 | return 0; |
| 1139 | } |
| 1140 | |
Jakub Kicinski | f4e6352 | 2017-11-03 13:56:16 -0700 | [diff] [blame] | 1141 | static int tun_xdp(struct net_device *dev, struct netdev_bpf *xdp) |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1142 | { |
| 1143 | switch (xdp->command) { |
| 1144 | case XDP_SETUP_PROG: |
| 1145 | return tun_xdp_set(dev, xdp->prog, xdp->extack); |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1146 | default: |
| 1147 | return -EINVAL; |
| 1148 | } |
| 1149 | } |
| 1150 | |
Nicolas Dichtel | 26d3192 | 2018-11-28 19:12:56 +0100 | [diff] [blame] | 1151 | static int tun_net_change_carrier(struct net_device *dev, bool new_carrier) |
| 1152 | { |
| 1153 | if (new_carrier) { |
| 1154 | struct tun_struct *tun = netdev_priv(dev); |
| 1155 | |
| 1156 | if (!tun->numqueues) |
| 1157 | return -EPERM; |
| 1158 | |
| 1159 | netif_carrier_on(dev); |
| 1160 | } else { |
| 1161 | netif_carrier_off(dev); |
| 1162 | } |
| 1163 | return 0; |
| 1164 | } |
| 1165 | |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 1166 | static const struct net_device_ops tun_netdev_ops = { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 1167 | .ndo_uninit = tun_net_uninit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 1168 | .ndo_open = tun_net_open, |
| 1169 | .ndo_stop = tun_net_close, |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 1170 | .ndo_start_xmit = tun_net_xmit, |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 1171 | .ndo_fix_features = tun_net_fix_features, |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 1172 | .ndo_select_queue = tun_select_queue, |
Paolo Abeni | eaea34b | 2016-02-26 10:45:40 +0100 | [diff] [blame] | 1173 | .ndo_set_rx_headroom = tun_set_headroom, |
Paolo Abeni | 608b997 | 2016-04-13 10:52:20 +0200 | [diff] [blame] | 1174 | .ndo_get_stats64 = tun_net_get_stats64, |
Nicolas Dichtel | 26d3192 | 2018-11-28 19:12:56 +0100 | [diff] [blame] | 1175 | .ndo_change_carrier = tun_net_change_carrier, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 1176 | }; |
| 1177 | |
Jesper Dangaard Brouer | 0c9d917 | 2018-05-31 11:00:03 +0200 | [diff] [blame] | 1178 | static void __tun_xdp_flush_tfile(struct tun_file *tfile) |
| 1179 | { |
| 1180 | /* Notify and wake up reader process */ |
| 1181 | if (tfile->flags & TUN_FASYNC) |
| 1182 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); |
| 1183 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
| 1184 | } |
| 1185 | |
Jesper Dangaard Brouer | 42b3346 | 2018-05-31 10:59:47 +0200 | [diff] [blame] | 1186 | static int tun_xdp_xmit(struct net_device *dev, int n, |
| 1187 | struct xdp_frame **frames, u32 flags) |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 1188 | { |
| 1189 | struct tun_struct *tun = netdev_priv(dev); |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 1190 | struct tun_file *tfile; |
| 1191 | u32 numqueues; |
Lorenzo Bianconi | fdc1397 | 2021-03-08 12:06:58 +0100 | [diff] [blame] | 1192 | int nxmit = 0; |
Jesper Dangaard Brouer | 735fc40 | 2018-05-24 16:46:12 +0200 | [diff] [blame] | 1193 | int i; |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 1194 | |
Jesper Dangaard Brouer | 0c9d917 | 2018-05-31 11:00:03 +0200 | [diff] [blame] | 1195 | if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) |
Jesper Dangaard Brouer | 42b3346 | 2018-05-31 10:59:47 +0200 | [diff] [blame] | 1196 | return -EINVAL; |
| 1197 | |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 1198 | rcu_read_lock(); |
| 1199 | |
Jason Wang | 9871a9e | 2019-05-08 23:20:18 -0400 | [diff] [blame] | 1200 | resample: |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 1201 | numqueues = READ_ONCE(tun->numqueues); |
| 1202 | if (!numqueues) { |
Jesper Dangaard Brouer | 735fc40 | 2018-05-24 16:46:12 +0200 | [diff] [blame] | 1203 | rcu_read_unlock(); |
| 1204 | return -ENXIO; /* Caller will free/return all frames */ |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 1205 | } |
| 1206 | |
| 1207 | tfile = rcu_dereference(tun->tfiles[smp_processor_id() % |
| 1208 | numqueues]); |
Jason Wang | 9871a9e | 2019-05-08 23:20:18 -0400 | [diff] [blame] | 1209 | if (unlikely(!tfile)) |
| 1210 | goto resample; |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 1211 | |
Jesper Dangaard Brouer | 735fc40 | 2018-05-24 16:46:12 +0200 | [diff] [blame] | 1212 | spin_lock(&tfile->tx_ring.producer_lock); |
| 1213 | for (i = 0; i < n; i++) { |
| 1214 | struct xdp_frame *xdp = frames[i]; |
| 1215 | /* Encode the XDP flag into lowest bit for consumer to differ |
| 1216 | * XDP buffer from sk_buff. |
| 1217 | */ |
| 1218 | void *frame = tun_xdp_to_ptr(xdp); |
| 1219 | |
| 1220 | if (__ptr_ring_produce(&tfile->tx_ring, frame)) { |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 1221 | atomic_long_inc(&dev->tx_dropped); |
Lorenzo Bianconi | fdc1397 | 2021-03-08 12:06:58 +0100 | [diff] [blame] | 1222 | break; |
Jesper Dangaard Brouer | 735fc40 | 2018-05-24 16:46:12 +0200 | [diff] [blame] | 1223 | } |
Lorenzo Bianconi | fdc1397 | 2021-03-08 12:06:58 +0100 | [diff] [blame] | 1224 | nxmit++; |
Jesper Dangaard Brouer | 735fc40 | 2018-05-24 16:46:12 +0200 | [diff] [blame] | 1225 | } |
| 1226 | spin_unlock(&tfile->tx_ring.producer_lock); |
| 1227 | |
Jesper Dangaard Brouer | 0c9d917 | 2018-05-31 11:00:03 +0200 | [diff] [blame] | 1228 | if (flags & XDP_XMIT_FLUSH) |
| 1229 | __tun_xdp_flush_tfile(tfile); |
| 1230 | |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 1231 | rcu_read_unlock(); |
Lorenzo Bianconi | fdc1397 | 2021-03-08 12:06:58 +0100 | [diff] [blame] | 1232 | return nxmit; |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 1233 | } |
| 1234 | |
Jesper Dangaard Brouer | 44fa2db | 2018-04-17 16:46:37 +0200 | [diff] [blame] | 1235 | static int tun_xdp_tx(struct net_device *dev, struct xdp_buff *xdp) |
| 1236 | { |
Lorenzo Bianconi | 1b698fa | 2020-05-28 22:47:29 +0200 | [diff] [blame] | 1237 | struct xdp_frame *frame = xdp_convert_buff_to_frame(xdp); |
Lorenzo Bianconi | fdc1397 | 2021-03-08 12:06:58 +0100 | [diff] [blame] | 1238 | int nxmit; |
Jesper Dangaard Brouer | 44fa2db | 2018-04-17 16:46:37 +0200 | [diff] [blame] | 1239 | |
| 1240 | if (unlikely(!frame)) |
| 1241 | return -EOVERFLOW; |
| 1242 | |
Lorenzo Bianconi | fdc1397 | 2021-03-08 12:06:58 +0100 | [diff] [blame] | 1243 | nxmit = tun_xdp_xmit(dev, 1, &frame, XDP_XMIT_FLUSH); |
| 1244 | if (!nxmit) |
| 1245 | xdp_return_frame_rx_napi(frame); |
| 1246 | return nxmit; |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 1247 | } |
| 1248 | |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 1249 | static const struct net_device_ops tap_netdev_ops = { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 1250 | .ndo_uninit = tun_net_uninit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 1251 | .ndo_open = tun_net_open, |
| 1252 | .ndo_stop = tun_net_close, |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 1253 | .ndo_start_xmit = tun_net_xmit, |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 1254 | .ndo_fix_features = tun_net_fix_features, |
Jiri Pirko | afc4b13 | 2011-08-16 06:29:01 +0000 | [diff] [blame] | 1255 | .ndo_set_rx_mode = tun_net_mclist, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 1256 | .ndo_set_mac_address = eth_mac_addr, |
| 1257 | .ndo_validate_addr = eth_validate_addr, |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 1258 | .ndo_select_queue = tun_select_queue, |
Toshiaki Makita | 5e52796 | 2015-07-31 15:03:27 +0900 | [diff] [blame] | 1259 | .ndo_features_check = passthru_features_check, |
Paolo Abeni | eaea34b | 2016-02-26 10:45:40 +0100 | [diff] [blame] | 1260 | .ndo_set_rx_headroom = tun_set_headroom, |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 1261 | .ndo_get_stats64 = dev_get_tstats64, |
Jakub Kicinski | f4e6352 | 2017-11-03 13:56:16 -0700 | [diff] [blame] | 1262 | .ndo_bpf = tun_xdp, |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 1263 | .ndo_xdp_xmit = tun_xdp_xmit, |
Nicolas Dichtel | 26d3192 | 2018-11-28 19:12:56 +0100 | [diff] [blame] | 1264 | .ndo_change_carrier = tun_net_change_carrier, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 1265 | }; |
| 1266 | |
Pavel Emelyanov | 944a137 | 2013-06-11 17:01:08 +0400 | [diff] [blame] | 1267 | static void tun_flow_init(struct tun_struct *tun) |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 1268 | { |
| 1269 | int i; |
| 1270 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 1271 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
| 1272 | INIT_HLIST_HEAD(&tun->flows[i]); |
| 1273 | |
| 1274 | tun->ageing_time = TUN_FLOW_EXPIRE; |
Kees Cook | e99e88a | 2017-10-16 14:43:17 -0700 | [diff] [blame] | 1275 | timer_setup(&tun->flow_gc_timer, tun_flow_cleanup, 0); |
| 1276 | mod_timer(&tun->flow_gc_timer, |
| 1277 | round_jiffies_up(jiffies + tun->ageing_time)); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 1278 | } |
| 1279 | |
| 1280 | static void tun_flow_uninit(struct tun_struct *tun) |
| 1281 | { |
| 1282 | del_timer_sync(&tun->flow_gc_timer); |
| 1283 | tun_flow_flush(tun); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 1284 | } |
| 1285 | |
Jarod Wilson | 9157208 | 2016-10-20 13:55:20 -0400 | [diff] [blame] | 1286 | #define MIN_MTU 68 |
| 1287 | #define MAX_MTU 65535 |
| 1288 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | /* Initialize net device. */ |
| 1290 | static void tun_net_init(struct net_device *dev) |
| 1291 | { |
| 1292 | struct tun_struct *tun = netdev_priv(dev); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | switch (tun->flags & TUN_TYPE_MASK) { |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1295 | case IFF_TUN: |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 1296 | dev->netdev_ops = &tun_netdev_ops; |
Jason A. Donenfeld | b9815eb | 2020-06-29 19:06:22 -0600 | [diff] [blame] | 1297 | dev->header_ops = &ip_tunnel_header_ops; |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 1298 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | /* Point-to-Point TUN Device */ |
| 1300 | dev->hard_header_len = 0; |
| 1301 | dev->addr_len = 0; |
| 1302 | dev->mtu = 1500; |
| 1303 | |
| 1304 | /* Zero header length */ |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1305 | dev->type = ARPHRD_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | break; |
| 1308 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1309 | case IFF_TAP: |
Kusanagi Kouichi | 7a0a960 | 2008-12-29 18:23:28 -0800 | [diff] [blame] | 1310 | dev->netdev_ops = &tap_netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | /* Ethernet TAP Device */ |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1312 | ether_setup(dev); |
Neil Horman | 550fd08 | 2011-07-26 06:05:38 +0000 | [diff] [blame] | 1313 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
stephen hemminger | a676847 | 2012-12-10 15:16:00 +0000 | [diff] [blame] | 1314 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | |
Danny Kukawka | f2cedb6 | 2012-02-15 06:45:39 +0000 | [diff] [blame] | 1316 | eth_hw_addr_random(dev); |
Brian Braunstein | 36226a8 | 2007-04-26 01:00:55 -0700 | [diff] [blame] | 1317 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | break; |
| 1319 | } |
Jarod Wilson | 9157208 | 2016-10-20 13:55:20 -0400 | [diff] [blame] | 1320 | |
| 1321 | dev->min_mtu = MIN_MTU; |
| 1322 | dev->max_mtu = MAX_MTU - dev->hard_header_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | } |
| 1324 | |
Jason Wang | 2f3ab62 | 2018-05-22 14:21:04 +0800 | [diff] [blame] | 1325 | static bool tun_sock_writeable(struct tun_struct *tun, struct tun_file *tfile) |
| 1326 | { |
| 1327 | struct sock *sk = tfile->socket.sk; |
| 1328 | |
| 1329 | return (tun->dev->flags & IFF_UP) && sock_writeable(sk); |
| 1330 | } |
| 1331 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | /* Character device part */ |
| 1333 | |
| 1334 | /* Poll */ |
Al Viro | afc9a42 | 2017-07-03 06:39:46 -0400 | [diff] [blame] | 1335 | static __poll_t tun_chr_poll(struct file *file, poll_table *wait) |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1336 | { |
Eric W. Biederman | b2430de | 2009-01-20 11:03:21 +0000 | [diff] [blame] | 1337 | struct tun_file *tfile = file->private_data; |
yuan linyu | 9484dc7 | 2017-09-23 22:36:52 +0800 | [diff] [blame] | 1338 | struct tun_struct *tun = tun_get(tfile); |
Mariusz Kozlowski | 3c8a9c6 | 2009-07-05 19:48:35 +0000 | [diff] [blame] | 1339 | struct sock *sk; |
Al Viro | afc9a42 | 2017-07-03 06:39:46 -0400 | [diff] [blame] | 1340 | __poll_t mask = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | |
| 1342 | if (!tun) |
Linus Torvalds | a9a0884 | 2018-02-11 14:34:03 -0800 | [diff] [blame] | 1343 | return EPOLLERR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1345 | sk = tfile->socket.sk; |
Mariusz Kozlowski | 3c8a9c6 | 2009-07-05 19:48:35 +0000 | [diff] [blame] | 1346 | |
Xi Wang | 9e641bd | 2014-05-16 15:11:48 -0700 | [diff] [blame] | 1347 | poll_wait(file, sk_sleep(sk), wait); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1348 | |
Jason Wang | 5990a30 | 2018-01-04 11:14:27 +0800 | [diff] [blame] | 1349 | if (!ptr_ring_empty(&tfile->tx_ring)) |
Linus Torvalds | a9a0884 | 2018-02-11 14:34:03 -0800 | [diff] [blame] | 1350 | mask |= EPOLLIN | EPOLLRDNORM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | |
Jason Wang | 2f3ab62 | 2018-05-22 14:21:04 +0800 | [diff] [blame] | 1352 | /* Make sure SOCKWQ_ASYNC_NOSPACE is set if not writable to |
| 1353 | * guarantee EPOLLOUT to be raised by either here or |
| 1354 | * tun_sock_write_space(). Then process could get notification |
| 1355 | * after it writes to a down device and meets -EIO. |
| 1356 | */ |
| 1357 | if (tun_sock_writeable(tun, tfile) || |
| 1358 | (!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags) && |
| 1359 | tun_sock_writeable(tun, tfile))) |
Linus Torvalds | a9a0884 | 2018-02-11 14:34:03 -0800 | [diff] [blame] | 1360 | mask |= EPOLLOUT | EPOLLWRNORM; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1361 | |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 1362 | if (tun->dev->reg_state != NETREG_REGISTERED) |
Linus Torvalds | a9a0884 | 2018-02-11 14:34:03 -0800 | [diff] [blame] | 1363 | mask = EPOLLERR; |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 1364 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1365 | tun_put(tun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | return mask; |
| 1367 | } |
| 1368 | |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 1369 | static struct sk_buff *tun_napi_alloc_frags(struct tun_file *tfile, |
| 1370 | size_t len, |
| 1371 | const struct iov_iter *it) |
| 1372 | { |
| 1373 | struct sk_buff *skb; |
| 1374 | size_t linear; |
| 1375 | int err; |
| 1376 | int i; |
| 1377 | |
| 1378 | if (it->nr_segs > MAX_SKB_FRAGS + 1) |
Yunjian Wang | 950271d | 2020-12-25 10:52:16 +0800 | [diff] [blame] | 1379 | return ERR_PTR(-EMSGSIZE); |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 1380 | |
| 1381 | local_bh_disable(); |
| 1382 | skb = napi_get_frags(&tfile->napi); |
| 1383 | local_bh_enable(); |
| 1384 | if (!skb) |
| 1385 | return ERR_PTR(-ENOMEM); |
| 1386 | |
| 1387 | linear = iov_iter_single_seg_count(it); |
| 1388 | err = __skb_grow(skb, linear); |
| 1389 | if (err) |
| 1390 | goto free; |
| 1391 | |
| 1392 | skb->len = len; |
| 1393 | skb->data_len = len - linear; |
| 1394 | skb->truesize += skb->data_len; |
| 1395 | |
| 1396 | for (i = 1; i < it->nr_segs; i++) { |
| 1397 | size_t fragsz = it->iov[i].iov_len; |
Eric Dumazet | aa6daac | 2018-11-18 07:37:33 -0800 | [diff] [blame] | 1398 | struct page *page; |
| 1399 | void *frag; |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 1400 | |
| 1401 | if (fragsz == 0 || fragsz > PAGE_SIZE) { |
| 1402 | err = -EINVAL; |
| 1403 | goto free; |
| 1404 | } |
Eric Dumazet | aa6daac | 2018-11-18 07:37:33 -0800 | [diff] [blame] | 1405 | frag = netdev_alloc_frag(fragsz); |
| 1406 | if (!frag) { |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 1407 | err = -ENOMEM; |
| 1408 | goto free; |
| 1409 | } |
Eric Dumazet | aa6daac | 2018-11-18 07:37:33 -0800 | [diff] [blame] | 1410 | page = virt_to_head_page(frag); |
| 1411 | skb_fill_page_desc(skb, i - 1, page, |
| 1412 | frag - page_address(page), fragsz); |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 1413 | } |
| 1414 | |
| 1415 | return skb; |
| 1416 | free: |
| 1417 | /* frees skb and all frags allocated with napi_alloc_frag() */ |
| 1418 | napi_free_frags(&tfile->napi); |
| 1419 | return ERR_PTR(err); |
| 1420 | } |
| 1421 | |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 1422 | /* prepad is the amount to reserve at front. len is length after that. |
| 1423 | * linear is a hint as to how much to copy (usually headers). */ |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1424 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
stephen hemminger | 6f7c156 | 2011-06-08 14:33:08 +0000 | [diff] [blame] | 1425 | size_t prepad, size_t len, |
| 1426 | size_t linear, int noblock) |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 1427 | { |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1428 | struct sock *sk = tfile->socket.sk; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 1429 | struct sk_buff *skb; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1430 | int err; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 1431 | |
| 1432 | /* Under a page? Don't bother with paged skb. */ |
Herbert Xu | 0eca93b | 2009-04-14 02:09:43 -0700 | [diff] [blame] | 1433 | if (prepad + len < PAGE_SIZE || !linear) |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1434 | linear = len; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 1435 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1436 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
Eric Dumazet | 28d6427 | 2013-08-08 14:38:47 -0700 | [diff] [blame] | 1437 | &err, 0); |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 1438 | if (!skb) |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1439 | return ERR_PTR(err); |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 1440 | |
| 1441 | skb_reserve(skb, prepad); |
| 1442 | skb_put(skb, linear); |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1443 | skb->data_len = len - linear; |
| 1444 | skb->len += len - linear; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 1445 | |
| 1446 | return skb; |
| 1447 | } |
| 1448 | |
Jason Wang | 5503fce | 2017-01-18 15:02:03 +0800 | [diff] [blame] | 1449 | static void tun_rx_batched(struct tun_struct *tun, struct tun_file *tfile, |
| 1450 | struct sk_buff *skb, int more) |
| 1451 | { |
| 1452 | struct sk_buff_head *queue = &tfile->sk.sk_write_queue; |
| 1453 | struct sk_buff_head process_queue; |
| 1454 | u32 rx_batched = tun->rx_batched; |
| 1455 | bool rcv = false; |
| 1456 | |
| 1457 | if (!rx_batched || (!more && skb_queue_empty(queue))) { |
| 1458 | local_bh_disable(); |
Matthew Cover | 8ebebcb | 2018-11-18 00:46:00 -0700 | [diff] [blame] | 1459 | skb_record_rx_queue(skb, tfile->queue_index); |
Jason Wang | 5503fce | 2017-01-18 15:02:03 +0800 | [diff] [blame] | 1460 | netif_receive_skb(skb); |
| 1461 | local_bh_enable(); |
| 1462 | return; |
| 1463 | } |
| 1464 | |
| 1465 | spin_lock(&queue->lock); |
| 1466 | if (!more || skb_queue_len(queue) == rx_batched) { |
| 1467 | __skb_queue_head_init(&process_queue); |
| 1468 | skb_queue_splice_tail_init(queue, &process_queue); |
| 1469 | rcv = true; |
| 1470 | } else { |
| 1471 | __skb_queue_tail(queue, skb); |
| 1472 | } |
| 1473 | spin_unlock(&queue->lock); |
| 1474 | |
| 1475 | if (rcv) { |
| 1476 | struct sk_buff *nskb; |
| 1477 | |
| 1478 | local_bh_disable(); |
Matthew Cover | 8ebebcb | 2018-11-18 00:46:00 -0700 | [diff] [blame] | 1479 | while ((nskb = __skb_dequeue(&process_queue))) { |
| 1480 | skb_record_rx_queue(nskb, tfile->queue_index); |
Jason Wang | 5503fce | 2017-01-18 15:02:03 +0800 | [diff] [blame] | 1481 | netif_receive_skb(nskb); |
Matthew Cover | 8ebebcb | 2018-11-18 00:46:00 -0700 | [diff] [blame] | 1482 | } |
| 1483 | skb_record_rx_queue(skb, tfile->queue_index); |
Jason Wang | 5503fce | 2017-01-18 15:02:03 +0800 | [diff] [blame] | 1484 | netif_receive_skb(skb); |
| 1485 | local_bh_enable(); |
| 1486 | } |
| 1487 | } |
| 1488 | |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 1489 | static bool tun_can_build_skb(struct tun_struct *tun, struct tun_file *tfile, |
| 1490 | int len, int noblock, bool zerocopy) |
| 1491 | { |
| 1492 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
| 1493 | return false; |
| 1494 | |
| 1495 | if (tfile->socket.sk->sk_sndbuf != INT_MAX) |
| 1496 | return false; |
| 1497 | |
| 1498 | if (!noblock) |
| 1499 | return false; |
| 1500 | |
| 1501 | if (zerocopy) |
| 1502 | return false; |
| 1503 | |
| 1504 | if (SKB_DATA_ALIGN(len + TUN_RX_PAD) + |
| 1505 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) > PAGE_SIZE) |
| 1506 | return false; |
| 1507 | |
| 1508 | return true; |
| 1509 | } |
| 1510 | |
Alexis Bauvin | 4b66336 | 2019-07-23 16:23:01 +0200 | [diff] [blame] | 1511 | static struct sk_buff *__tun_build_skb(struct tun_file *tfile, |
| 1512 | struct page_frag *alloc_frag, char *buf, |
Jason Wang | 8ae1aff | 2018-09-12 11:17:04 +0800 | [diff] [blame] | 1513 | int buflen, int len, int pad) |
Jason Wang | ac1f1f6 | 2018-09-12 11:17:03 +0800 | [diff] [blame] | 1514 | { |
| 1515 | struct sk_buff *skb = build_skb(buf, buflen); |
| 1516 | |
| 1517 | if (!skb) |
| 1518 | return ERR_PTR(-ENOMEM); |
| 1519 | |
Jason Wang | 8ae1aff | 2018-09-12 11:17:04 +0800 | [diff] [blame] | 1520 | skb_reserve(skb, pad); |
Jason Wang | ac1f1f6 | 2018-09-12 11:17:03 +0800 | [diff] [blame] | 1521 | skb_put(skb, len); |
Alexis Bauvin | 4b66336 | 2019-07-23 16:23:01 +0200 | [diff] [blame] | 1522 | skb_set_owner_w(skb, tfile->socket.sk); |
Jason Wang | ac1f1f6 | 2018-09-12 11:17:03 +0800 | [diff] [blame] | 1523 | |
| 1524 | get_page(alloc_frag->page); |
| 1525 | alloc_frag->offset += buflen; |
| 1526 | |
| 1527 | return skb; |
| 1528 | } |
| 1529 | |
Jason Wang | 8ae1aff | 2018-09-12 11:17:04 +0800 | [diff] [blame] | 1530 | static int tun_xdp_act(struct tun_struct *tun, struct bpf_prog *xdp_prog, |
| 1531 | struct xdp_buff *xdp, u32 act) |
| 1532 | { |
| 1533 | int err; |
| 1534 | |
| 1535 | switch (act) { |
| 1536 | case XDP_REDIRECT: |
| 1537 | err = xdp_do_redirect(tun->dev, xdp, xdp_prog); |
Jason Wang | 8ae1aff | 2018-09-12 11:17:04 +0800 | [diff] [blame] | 1538 | if (err) |
| 1539 | return err; |
| 1540 | break; |
| 1541 | case XDP_TX: |
| 1542 | err = tun_xdp_tx(tun->dev, xdp); |
| 1543 | if (err < 0) |
| 1544 | return err; |
| 1545 | break; |
| 1546 | case XDP_PASS: |
| 1547 | break; |
| 1548 | default: |
| 1549 | bpf_warn_invalid_xdp_action(act); |
Gustavo A. R. Silva | df561f66 | 2020-08-23 17:36:59 -0500 | [diff] [blame] | 1550 | fallthrough; |
Jason Wang | 8ae1aff | 2018-09-12 11:17:04 +0800 | [diff] [blame] | 1551 | case XDP_ABORTED: |
| 1552 | trace_xdp_exception(tun->dev, xdp_prog, act); |
Gustavo A. R. Silva | df561f66 | 2020-08-23 17:36:59 -0500 | [diff] [blame] | 1553 | fallthrough; |
Jason Wang | 8ae1aff | 2018-09-12 11:17:04 +0800 | [diff] [blame] | 1554 | case XDP_DROP: |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 1555 | atomic_long_inc(&tun->dev->rx_dropped); |
Jason Wang | 8ae1aff | 2018-09-12 11:17:04 +0800 | [diff] [blame] | 1556 | break; |
| 1557 | } |
| 1558 | |
| 1559 | return act; |
| 1560 | } |
| 1561 | |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1562 | static struct sk_buff *tun_build_skb(struct tun_struct *tun, |
| 1563 | struct tun_file *tfile, |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 1564 | struct iov_iter *from, |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1565 | struct virtio_net_hdr *hdr, |
Jason Wang | 1cfe6e9 | 2017-09-04 11:36:09 +0800 | [diff] [blame] | 1566 | int len, int *skb_xdp) |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 1567 | { |
Eric Dumazet | 0bbd7da | 2017-08-16 22:14:33 +0800 | [diff] [blame] | 1568 | struct page_frag *alloc_frag = ¤t->task_frag; |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1569 | struct bpf_prog *xdp_prog; |
Jason Wang | 7df1321 | 2017-09-04 11:36:08 +0800 | [diff] [blame] | 1570 | int buflen = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 1571 | char *buf; |
| 1572 | size_t copied; |
Jason Wang | 8ae1aff | 2018-09-12 11:17:04 +0800 | [diff] [blame] | 1573 | int pad = TUN_RX_PAD; |
| 1574 | int err = 0; |
Jason Wang | 7df1321 | 2017-09-04 11:36:08 +0800 | [diff] [blame] | 1575 | |
| 1576 | rcu_read_lock(); |
| 1577 | xdp_prog = rcu_dereference(tun->xdp_prog); |
| 1578 | if (xdp_prog) |
Jason Wang | 4f23aff | 2018-09-12 11:17:00 +0800 | [diff] [blame] | 1579 | pad += XDP_PACKET_HEADROOM; |
Jason Wang | 7df1321 | 2017-09-04 11:36:08 +0800 | [diff] [blame] | 1580 | buflen += SKB_DATA_ALIGN(len + pad); |
| 1581 | rcu_read_unlock(); |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 1582 | |
Jason Wang | 63b9ab6 | 2017-10-27 11:05:44 +0800 | [diff] [blame] | 1583 | alloc_frag->offset = ALIGN((u64)alloc_frag->offset, SMP_CACHE_BYTES); |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 1584 | if (unlikely(!skb_page_frag_refill(buflen, alloc_frag, GFP_KERNEL))) |
| 1585 | return ERR_PTR(-ENOMEM); |
| 1586 | |
| 1587 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
| 1588 | copied = copy_page_from_iter(alloc_frag->page, |
Jason Wang | 7df1321 | 2017-09-04 11:36:08 +0800 | [diff] [blame] | 1589 | alloc_frag->offset + pad, |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 1590 | len, from); |
| 1591 | if (copied != len) |
| 1592 | return ERR_PTR(-EFAULT); |
| 1593 | |
Jason Wang | 7df1321 | 2017-09-04 11:36:08 +0800 | [diff] [blame] | 1594 | /* There's a small window that XDP may be set after the check |
| 1595 | * of xdp_prog above, this should be rare and for simplicity |
| 1596 | * we do XDP on skb in case the headroom is not enough. |
| 1597 | */ |
Jason Wang | ac1f1f6 | 2018-09-12 11:17:03 +0800 | [diff] [blame] | 1598 | if (hdr->gso_type || !xdp_prog) { |
Jason Wang | 1cfe6e9 | 2017-09-04 11:36:09 +0800 | [diff] [blame] | 1599 | *skb_xdp = 1; |
Alexis Bauvin | 4b66336 | 2019-07-23 16:23:01 +0200 | [diff] [blame] | 1600 | return __tun_build_skb(tfile, alloc_frag, buf, buflen, len, |
| 1601 | pad); |
Jason Wang | ac1f1f6 | 2018-09-12 11:17:03 +0800 | [diff] [blame] | 1602 | } |
| 1603 | |
| 1604 | *skb_xdp = 0; |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 1605 | |
Toshiaki Makita | 6547e38 | 2018-05-28 19:37:49 +0900 | [diff] [blame] | 1606 | local_bh_disable(); |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1607 | rcu_read_lock(); |
| 1608 | xdp_prog = rcu_dereference(tun->xdp_prog); |
Jason Wang | 8ae1aff | 2018-09-12 11:17:04 +0800 | [diff] [blame] | 1609 | if (xdp_prog) { |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1610 | struct xdp_buff xdp; |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1611 | u32 act; |
| 1612 | |
Lorenzo Bianconi | 43b5169 | 2020-12-22 22:09:28 +0100 | [diff] [blame] | 1613 | xdp_init_buff(&xdp, buflen, &tfile->xdp_rxq); |
Lorenzo Bianconi | be9df4a | 2020-12-22 22:09:29 +0100 | [diff] [blame] | 1614 | xdp_prepare_buff(&xdp, buf, pad, len, false); |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1615 | |
Jason Wang | 8ae1aff | 2018-09-12 11:17:04 +0800 | [diff] [blame] | 1616 | act = bpf_prog_run_xdp(xdp_prog, &xdp); |
| 1617 | if (act == XDP_REDIRECT || act == XDP_TX) { |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1618 | get_page(alloc_frag->page); |
| 1619 | alloc_frag->offset += buflen; |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1620 | } |
Jason Wang | 8ae1aff | 2018-09-12 11:17:04 +0800 | [diff] [blame] | 1621 | err = tun_xdp_act(tun, xdp_prog, &xdp, act); |
Will Deacon | bee3489 | 2020-04-03 16:13:21 +0100 | [diff] [blame] | 1622 | if (err < 0) { |
| 1623 | if (act == XDP_REDIRECT || act == XDP_TX) |
| 1624 | put_page(alloc_frag->page); |
| 1625 | goto out; |
| 1626 | } |
| 1627 | |
Jason Wang | 1a09791 | 2018-09-12 11:17:05 +0800 | [diff] [blame] | 1628 | if (err == XDP_REDIRECT) |
Toke Høiland-Jørgensen | 1d23388 | 2020-01-16 16:14:45 +0100 | [diff] [blame] | 1629 | xdp_do_flush(); |
Jason Wang | 8ae1aff | 2018-09-12 11:17:04 +0800 | [diff] [blame] | 1630 | if (err != XDP_PASS) |
| 1631 | goto out; |
| 1632 | |
| 1633 | pad = xdp.data - xdp.data_hard_start; |
| 1634 | len = xdp.data_end - xdp.data; |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1635 | } |
Jason Wang | 291aeb2 | 2018-09-12 11:17:01 +0800 | [diff] [blame] | 1636 | rcu_read_unlock(); |
| 1637 | local_bh_enable(); |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1638 | |
Alexis Bauvin | 4b66336 | 2019-07-23 16:23:01 +0200 | [diff] [blame] | 1639 | return __tun_build_skb(tfile, alloc_frag, buf, buflen, len, pad); |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1640 | |
Jason Wang | f7053b6 | 2018-09-12 11:17:02 +0800 | [diff] [blame] | 1641 | out: |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1642 | rcu_read_unlock(); |
Toshiaki Makita | 6547e38 | 2018-05-28 19:37:49 +0900 | [diff] [blame] | 1643 | local_bh_enable(); |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1644 | return NULL; |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 1645 | } |
| 1646 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | /* Get packet from user space buffer */ |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1648 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1649 | void *msg_control, struct iov_iter *from, |
Jason Wang | 5503fce | 2017-01-18 15:02:03 +0800 | [diff] [blame] | 1650 | int noblock, bool more) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | { |
Harvey Harrison | 09640e63 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 1652 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | struct sk_buff *skb; |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1654 | size_t total_len = iov_iter_count(from); |
Paolo Abeni | eaea34b | 2016-02-26 10:45:40 +0100 | [diff] [blame] | 1655 | size_t len = total_len, align = tun->align, linear; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1656 | struct virtio_net_hdr gso = { 0 }; |
Jason Wang | 96f8d9e | 2013-11-13 14:00:39 +0800 | [diff] [blame] | 1657 | int good_linear; |
Michael S. Tsirkin | 0690899 | 2012-07-20 09:23:23 +0000 | [diff] [blame] | 1658 | int copylen; |
| 1659 | bool zerocopy = false; |
| 1660 | int err; |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 1661 | u32 rxhash = 0; |
Jason Wang | 1cfe6e9 | 2017-09-04 11:36:09 +0800 | [diff] [blame] | 1662 | int skb_xdp = 1; |
Eric Dumazet | af3fb24 | 2018-09-28 14:51:49 -0700 | [diff] [blame] | 1663 | bool frags = tun_napi_frags_enabled(tfile); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1665 | if (!(tun->flags & IFF_NO_PI)) { |
Dan Carpenter | 15718ea | 2013-08-15 15:52:57 +0300 | [diff] [blame] | 1666 | if (len < sizeof(pi)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | return -EINVAL; |
Dan Carpenter | 15718ea | 2013-08-15 15:52:57 +0300 | [diff] [blame] | 1668 | len -= sizeof(pi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | |
Al Viro | cbbd26b | 2016-11-01 22:09:04 -0400 | [diff] [blame] | 1670 | if (!copy_from_iter_full(&pi, sizeof(pi), from)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | return -EFAULT; |
| 1672 | } |
| 1673 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1674 | if (tun->flags & IFF_VNET_HDR) { |
Willem de Bruijn | e1edab8 | 2017-02-03 18:20:48 -0500 | [diff] [blame] | 1675 | int vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); |
| 1676 | |
| 1677 | if (len < vnet_hdr_sz) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1678 | return -EINVAL; |
Willem de Bruijn | e1edab8 | 2017-02-03 18:20:48 -0500 | [diff] [blame] | 1679 | len -= vnet_hdr_sz; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1680 | |
Al Viro | cbbd26b | 2016-11-01 22:09:04 -0400 | [diff] [blame] | 1681 | if (!copy_from_iter_full(&gso, sizeof(gso), from)) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1682 | return -EFAULT; |
| 1683 | |
Herbert Xu | 4909122 | 2009-06-08 00:20:01 -0700 | [diff] [blame] | 1684 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 1685 | tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2 > tun16_to_cpu(tun, gso.hdr_len)) |
| 1686 | gso.hdr_len = cpu_to_tun16(tun, tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2); |
Herbert Xu | 4909122 | 2009-06-08 00:20:01 -0700 | [diff] [blame] | 1687 | |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 1688 | if (tun16_to_cpu(tun, gso.hdr_len) > len) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1689 | return -EINVAL; |
Willem de Bruijn | e1edab8 | 2017-02-03 18:20:48 -0500 | [diff] [blame] | 1690 | iov_iter_advance(from, vnet_hdr_sz - sizeof(gso)); |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1691 | } |
| 1692 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1693 | if ((tun->flags & TUN_TYPE_MASK) == IFF_TAP) { |
stephen hemminger | a504b86 | 2011-06-08 14:33:07 +0000 | [diff] [blame] | 1694 | align += NET_IP_ALIGN; |
Herbert Xu | 0eca93b | 2009-04-14 02:09:43 -0700 | [diff] [blame] | 1695 | if (unlikely(len < ETH_HLEN || |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 1696 | (gso.hdr_len && tun16_to_cpu(tun, gso.hdr_len) < ETH_HLEN))) |
Rusty Russell | e01bf1c | 2008-04-12 18:49:30 -0700 | [diff] [blame] | 1697 | return -EINVAL; |
| 1698 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1699 | |
Jason Wang | 96f8d9e | 2013-11-13 14:00:39 +0800 | [diff] [blame] | 1700 | good_linear = SKB_MAX_HEAD(align); |
| 1701 | |
Jason Wang | 8852917 | 2013-07-18 10:55:15 +0800 | [diff] [blame] | 1702 | if (msg_control) { |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1703 | struct iov_iter i = *from; |
| 1704 | |
Jason Wang | 8852917 | 2013-07-18 10:55:15 +0800 | [diff] [blame] | 1705 | /* There are 256 bytes to be copied in skb, so there is |
| 1706 | * enough room for skb expand head in case it is used. |
Michael S. Tsirkin | 0690899 | 2012-07-20 09:23:23 +0000 | [diff] [blame] | 1707 | * The rest of the buffer is mapped from userspace. |
| 1708 | */ |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 1709 | copylen = gso.hdr_len ? tun16_to_cpu(tun, gso.hdr_len) : GOODCOPY_LEN; |
Jason Wang | 96f8d9e | 2013-11-13 14:00:39 +0800 | [diff] [blame] | 1710 | if (copylen > good_linear) |
| 1711 | copylen = good_linear; |
Jason Wang | 3dd5c33 | 2013-07-10 13:43:27 +0800 | [diff] [blame] | 1712 | linear = copylen; |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1713 | iov_iter_advance(&i, copylen); |
| 1714 | if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS) |
Jason Wang | 8852917 | 2013-07-18 10:55:15 +0800 | [diff] [blame] | 1715 | zerocopy = true; |
| 1716 | } |
| 1717 | |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 1718 | if (!frags && tun_can_build_skb(tun, tfile, len, noblock, zerocopy)) { |
Jason Wang | 1cfe6e9 | 2017-09-04 11:36:09 +0800 | [diff] [blame] | 1719 | /* For the packet that is not easy to be processed |
| 1720 | * (e.g gso or jumbo packet), we will do it at after |
| 1721 | * skb was created with generic XDP routine. |
| 1722 | */ |
| 1723 | skb = tun_build_skb(tun, tfile, from, &gso, len, &skb_xdp); |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 1724 | if (IS_ERR(skb)) { |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 1725 | atomic_long_inc(&tun->dev->rx_dropped); |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 1726 | return PTR_ERR(skb); |
| 1727 | } |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1728 | if (!skb) |
| 1729 | return total_len; |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 1730 | } else { |
| 1731 | if (!zerocopy) { |
| 1732 | copylen = len; |
| 1733 | if (tun16_to_cpu(tun, gso.hdr_len) > good_linear) |
| 1734 | linear = good_linear; |
| 1735 | else |
| 1736 | linear = tun16_to_cpu(tun, gso.hdr_len); |
| 1737 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 1739 | if (frags) { |
| 1740 | mutex_lock(&tfile->napi_mutex); |
| 1741 | skb = tun_napi_alloc_frags(tfile, copylen, from); |
| 1742 | /* tun_napi_alloc_frags() enforces a layout for the skb. |
| 1743 | * If zerocopy is enabled, then this layout will be |
| 1744 | * overwritten by zerocopy_sg_from_iter(). |
| 1745 | */ |
| 1746 | zerocopy = false; |
| 1747 | } else { |
| 1748 | skb = tun_alloc_skb(tfile, align, copylen, linear, |
| 1749 | noblock); |
| 1750 | } |
| 1751 | |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 1752 | if (IS_ERR(skb)) { |
| 1753 | if (PTR_ERR(skb) != -EAGAIN) |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 1754 | atomic_long_inc(&tun->dev->rx_dropped); |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 1755 | if (frags) |
| 1756 | mutex_unlock(&tfile->napi_mutex); |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 1757 | return PTR_ERR(skb); |
| 1758 | } |
Michael S. Tsirkin | 0690899 | 2012-07-20 09:23:23 +0000 | [diff] [blame] | 1759 | |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 1760 | if (zerocopy) |
| 1761 | err = zerocopy_sg_from_iter(skb, from); |
| 1762 | else |
| 1763 | err = skb_copy_datagram_from_iter(skb, 0, from, len); |
| 1764 | |
| 1765 | if (err) { |
Eric Dumazet | 4477138 | 2019-03-14 20:19:47 -0700 | [diff] [blame] | 1766 | err = -EFAULT; |
| 1767 | drop: |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 1768 | atomic_long_inc(&tun->dev->rx_dropped); |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 1769 | kfree_skb(skb); |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 1770 | if (frags) { |
| 1771 | tfile->napi.skb = NULL; |
| 1772 | mutex_unlock(&tfile->napi_mutex); |
| 1773 | } |
| 1774 | |
Eric Dumazet | 4477138 | 2019-03-14 20:19:47 -0700 | [diff] [blame] | 1775 | return err; |
Jason Wang | 66ccbc9 | 2017-08-11 19:41:16 +0800 | [diff] [blame] | 1776 | } |
Dave Jones | 8f22757 | 2006-03-11 18:49:13 -0800 | [diff] [blame] | 1777 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1778 | |
Jarno Rajahalme | 3e9e40e | 2016-11-18 15:40:38 -0800 | [diff] [blame] | 1779 | if (virtio_net_hdr_to_skb(skb, &gso, tun_is_little_endian(tun))) { |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 1780 | atomic_long_inc(&tun->rx_frame_errors); |
Paolo Abeni | df10db9 | 2016-06-14 00:00:04 +0200 | [diff] [blame] | 1781 | kfree_skb(skb); |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 1782 | if (frags) { |
| 1783 | tfile->napi.skb = NULL; |
| 1784 | mutex_unlock(&tfile->napi_mutex); |
| 1785 | } |
| 1786 | |
Paolo Abeni | df10db9 | 2016-06-14 00:00:04 +0200 | [diff] [blame] | 1787 | return -EINVAL; |
| 1788 | } |
| 1789 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | switch (tun->flags & TUN_TYPE_MASK) { |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1791 | case IFF_TUN: |
| 1792 | if (tun->flags & IFF_NO_PI) { |
Alexander Potapenko | 2580c4c | 2017-09-28 11:32:37 +0200 | [diff] [blame] | 1793 | u8 ip_version = skb->len ? (skb->data[0] >> 4) : 0; |
| 1794 | |
| 1795 | switch (ip_version) { |
| 1796 | case 4: |
Ang Way Chuang | f09f7ee | 2008-06-17 21:10:33 -0700 | [diff] [blame] | 1797 | pi.proto = htons(ETH_P_IP); |
| 1798 | break; |
Alexander Potapenko | 2580c4c | 2017-09-28 11:32:37 +0200 | [diff] [blame] | 1799 | case 6: |
Ang Way Chuang | f09f7ee | 2008-06-17 21:10:33 -0700 | [diff] [blame] | 1800 | pi.proto = htons(ETH_P_IPV6); |
| 1801 | break; |
| 1802 | default: |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 1803 | atomic_long_inc(&tun->dev->rx_dropped); |
Ang Way Chuang | f09f7ee | 2008-06-17 21:10:33 -0700 | [diff] [blame] | 1804 | kfree_skb(skb); |
| 1805 | return -EINVAL; |
| 1806 | } |
| 1807 | } |
| 1808 | |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1809 | skb_reset_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1810 | skb->protocol = pi.proto; |
Arnaldo Carvalho de Melo | 4c13eb6 | 2007-04-25 17:40:23 -0700 | [diff] [blame] | 1811 | skb->dev = tun->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1812 | break; |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1813 | case IFF_TAP: |
Willem de Bruijn | 96aa1b2 | 2020-05-30 15:41:31 -0400 | [diff] [blame] | 1814 | if (frags && !pskb_may_pull(skb, ETH_HLEN)) { |
| 1815 | err = -ENOMEM; |
| 1816 | goto drop; |
| 1817 | } |
| 1818 | skb->protocol = eth_type_trans(skb, tun->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | break; |
Joe Perches | 6403eab | 2011-06-03 11:51:20 +0000 | [diff] [blame] | 1820 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1821 | |
Michael S. Tsirkin | 0690899 | 2012-07-20 09:23:23 +0000 | [diff] [blame] | 1822 | /* copy skb_ubuf_info for callback when skb has no error */ |
| 1823 | if (zerocopy) { |
Jonathan Lemon | 9ee5e5a | 2021-01-06 14:18:40 -0800 | [diff] [blame] | 1824 | skb_zcopy_init(skb, msg_control); |
Jason Wang | af1cc7a | 2016-11-30 13:17:51 +0800 | [diff] [blame] | 1825 | } else if (msg_control) { |
| 1826 | struct ubuf_info *uarg = msg_control; |
Jonathan Lemon | 3617783 | 2021-01-06 14:18:34 -0800 | [diff] [blame] | 1827 | uarg->callback(NULL, uarg, false); |
Michael S. Tsirkin | 0690899 | 2012-07-20 09:23:23 +0000 | [diff] [blame] | 1828 | } |
| 1829 | |
Vlad Yasevich | 72f6510 | 2015-02-03 16:36:16 -0500 | [diff] [blame] | 1830 | skb_reset_network_header(skb); |
Maxim Mikityanskiy | d2aa125 | 2019-02-21 12:39:57 +0000 | [diff] [blame] | 1831 | skb_probe_transport_header(skb); |
Gilberto Bertin | 3fe260e | 2020-04-10 18:20:59 +0200 | [diff] [blame] | 1832 | skb_record_rx_queue(skb, tfile->queue_index); |
Jason Wang | 38502af | 2013-03-25 20:19:56 +0000 | [diff] [blame] | 1833 | |
Jason Wang | 1cfe6e9 | 2017-09-04 11:36:09 +0800 | [diff] [blame] | 1834 | if (skb_xdp) { |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1835 | struct bpf_prog *xdp_prog; |
| 1836 | int ret; |
| 1837 | |
Toshiaki Makita | 6547e38 | 2018-05-28 19:37:49 +0900 | [diff] [blame] | 1838 | local_bh_disable(); |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1839 | rcu_read_lock(); |
| 1840 | xdp_prog = rcu_dereference(tun->xdp_prog); |
| 1841 | if (xdp_prog) { |
| 1842 | ret = do_xdp_generic(xdp_prog, skb); |
| 1843 | if (ret != XDP_PASS) { |
| 1844 | rcu_read_unlock(); |
Toshiaki Makita | 6547e38 | 2018-05-28 19:37:49 +0900 | [diff] [blame] | 1845 | local_bh_enable(); |
Eric Dumazet | 1efba98 | 2020-01-22 09:07:35 -0800 | [diff] [blame] | 1846 | if (frags) { |
| 1847 | tfile->napi.skb = NULL; |
| 1848 | mutex_unlock(&tfile->napi_mutex); |
| 1849 | } |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1850 | return total_len; |
| 1851 | } |
| 1852 | } |
| 1853 | rcu_read_unlock(); |
Toshiaki Makita | 6547e38 | 2018-05-28 19:37:49 +0900 | [diff] [blame] | 1854 | local_bh_enable(); |
Jason Wang | 761876c | 2017-08-11 19:41:18 +0800 | [diff] [blame] | 1855 | } |
| 1856 | |
Paolo Abeni | cf1a1e0 | 2018-04-20 13:18:16 +0200 | [diff] [blame] | 1857 | /* Compute the costly rx hash only if needed for flow updates. |
| 1858 | * We may get a very small possibility of OOO during switching, not |
| 1859 | * worth to optimize. |
| 1860 | */ |
| 1861 | if (!rcu_access_pointer(tun->steering_prog) && tun->numqueues > 1 && |
| 1862 | !tfile->detached) |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 1863 | rxhash = __skb_get_hash_symmetric(skb); |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 1864 | |
Eric Dumazet | 4477138 | 2019-03-14 20:19:47 -0700 | [diff] [blame] | 1865 | rcu_read_lock(); |
| 1866 | if (unlikely(!(tun->dev->flags & IFF_UP))) { |
| 1867 | err = -EIO; |
Eric Dumazet | 9180bb4 | 2019-03-16 13:09:53 -0700 | [diff] [blame] | 1868 | rcu_read_unlock(); |
Eric Dumazet | 4477138 | 2019-03-14 20:19:47 -0700 | [diff] [blame] | 1869 | goto drop; |
| 1870 | } |
| 1871 | |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 1872 | if (frags) { |
Willem de Bruijn | 96aa1b2 | 2020-05-30 15:41:31 -0400 | [diff] [blame] | 1873 | u32 headlen; |
| 1874 | |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 1875 | /* Exercise flow dissector code path. */ |
Willem de Bruijn | 96aa1b2 | 2020-05-30 15:41:31 -0400 | [diff] [blame] | 1876 | skb_push(skb, ETH_HLEN); |
| 1877 | headlen = eth_get_headlen(tun->dev, skb->data, |
| 1878 | skb_headlen(skb)); |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 1879 | |
Eric Dumazet | 010f245 | 2017-10-17 10:07:44 -0700 | [diff] [blame] | 1880 | if (unlikely(headlen > skb_headlen(skb))) { |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 1881 | atomic_long_inc(&tun->dev->rx_dropped); |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 1882 | napi_free_frags(&tfile->napi); |
Eric Dumazet | 4477138 | 2019-03-14 20:19:47 -0700 | [diff] [blame] | 1883 | rcu_read_unlock(); |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 1884 | mutex_unlock(&tfile->napi_mutex); |
| 1885 | WARN_ON(1); |
| 1886 | return -ENOMEM; |
| 1887 | } |
| 1888 | |
| 1889 | local_bh_disable(); |
| 1890 | napi_gro_frags(&tfile->napi); |
| 1891 | local_bh_enable(); |
| 1892 | mutex_unlock(&tfile->napi_mutex); |
Eric Dumazet | aec72f3 | 2017-10-18 12:12:09 -0700 | [diff] [blame] | 1893 | } else if (tfile->napi_enabled) { |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 1894 | struct sk_buff_head *queue = &tfile->sk.sk_write_queue; |
| 1895 | int queue_len; |
| 1896 | |
| 1897 | spin_lock_bh(&queue->lock); |
| 1898 | __skb_queue_tail(queue, skb); |
| 1899 | queue_len = skb_queue_len(queue); |
| 1900 | spin_unlock(&queue->lock); |
| 1901 | |
| 1902 | if (!more || queue_len > NAPI_POLL_WEIGHT) |
| 1903 | napi_schedule(&tfile->napi); |
| 1904 | |
| 1905 | local_bh_enable(); |
| 1906 | } else if (!IS_ENABLED(CONFIG_4KSTACKS)) { |
| 1907 | tun_rx_batched(tun, tfile, skb, more); |
| 1908 | } else { |
| 1909 | netif_rx_ni(skb); |
| 1910 | } |
Eric Dumazet | 4477138 | 2019-03-14 20:19:47 -0700 | [diff] [blame] | 1911 | rcu_read_unlock(); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1912 | |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 1913 | preempt_disable(); |
| 1914 | dev_sw_netstats_rx_add(tun->dev, len); |
| 1915 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 1917 | if (rxhash) |
| 1918 | tun_flow_update(tun, rxhash, tfile); |
| 1919 | |
Michael S. Tsirkin | 0690899 | 2012-07-20 09:23:23 +0000 | [diff] [blame] | 1920 | return total_len; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1921 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1923 | static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1924 | { |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1925 | struct file *file = iocb->ki_filp; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1926 | struct tun_file *tfile = file->private_data; |
yuan linyu | 9484dc7 | 2017-09-23 22:36:52 +0800 | [diff] [blame] | 1927 | struct tun_struct *tun = tun_get(tfile); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1928 | ssize_t result; |
Jens Axboe | 5aac039 | 2020-11-20 07:59:54 -0700 | [diff] [blame] | 1929 | int noblock = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1930 | |
| 1931 | if (!tun) |
| 1932 | return -EBADFD; |
| 1933 | |
Jens Axboe | 5aac039 | 2020-11-20 07:59:54 -0700 | [diff] [blame] | 1934 | if ((file->f_flags & O_NONBLOCK) || (iocb->ki_flags & IOCB_NOWAIT)) |
| 1935 | noblock = 1; |
| 1936 | |
| 1937 | result = tun_get_user(tun, tfile, NULL, from, noblock, false); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1938 | |
| 1939 | tun_put(tun); |
| 1940 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | } |
| 1942 | |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 1943 | static ssize_t tun_put_user_xdp(struct tun_struct *tun, |
| 1944 | struct tun_file *tfile, |
Jesper Dangaard Brouer | 1ffcbc8 | 2018-04-17 16:45:47 +0200 | [diff] [blame] | 1945 | struct xdp_frame *xdp_frame, |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 1946 | struct iov_iter *iter) |
| 1947 | { |
| 1948 | int vnet_hdr_sz = 0; |
Jesper Dangaard Brouer | 1ffcbc8 | 2018-04-17 16:45:47 +0200 | [diff] [blame] | 1949 | size_t size = xdp_frame->len; |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 1950 | size_t ret; |
| 1951 | |
| 1952 | if (tun->flags & IFF_VNET_HDR) { |
| 1953 | struct virtio_net_hdr gso = { 0 }; |
| 1954 | |
| 1955 | vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); |
| 1956 | if (unlikely(iov_iter_count(iter) < vnet_hdr_sz)) |
| 1957 | return -EINVAL; |
| 1958 | if (unlikely(copy_to_iter(&gso, sizeof(gso), iter) != |
| 1959 | sizeof(gso))) |
| 1960 | return -EFAULT; |
| 1961 | iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); |
| 1962 | } |
| 1963 | |
Jesper Dangaard Brouer | 1ffcbc8 | 2018-04-17 16:45:47 +0200 | [diff] [blame] | 1964 | ret = copy_to_iter(xdp_frame->data, size, iter) + vnet_hdr_sz; |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 1965 | |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 1966 | preempt_disable(); |
| 1967 | dev_sw_netstats_tx_add(tun->dev, 1, ret); |
| 1968 | preempt_enable(); |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 1969 | |
| 1970 | return ret; |
| 1971 | } |
| 1972 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1973 | /* Put packet to the user space buffer */ |
stephen hemminger | 6f7c156 | 2011-06-08 14:33:08 +0000 | [diff] [blame] | 1974 | static ssize_t tun_put_user(struct tun_struct *tun, |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1975 | struct tun_file *tfile, |
stephen hemminger | 6f7c156 | 2011-06-08 14:33:08 +0000 | [diff] [blame] | 1976 | struct sk_buff *skb, |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1977 | struct iov_iter *iter) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1978 | { |
| 1979 | struct tun_pi pi = { 0, skb->protocol }; |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1980 | ssize_t total; |
Jason Wang | 8c847d2 | 2014-11-13 16:54:14 +0800 | [diff] [blame] | 1981 | int vlan_offset = 0; |
Herbert Xu | a8f9bfd | 2014-11-03 04:30:13 +0800 | [diff] [blame] | 1982 | int vlan_hlen = 0; |
Herbert Xu | 2eb783c | 2014-11-03 04:30:14 +0800 | [diff] [blame] | 1983 | int vnet_hdr_sz = 0; |
Herbert Xu | a8f9bfd | 2014-11-03 04:30:13 +0800 | [diff] [blame] | 1984 | |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 1985 | if (skb_vlan_tag_present(skb)) |
Herbert Xu | a8f9bfd | 2014-11-03 04:30:13 +0800 | [diff] [blame] | 1986 | vlan_hlen = VLAN_HLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1988 | if (tun->flags & IFF_VNET_HDR) |
Willem de Bruijn | e1edab8 | 2017-02-03 18:20:48 -0500 | [diff] [blame] | 1989 | vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1990 | |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1991 | total = skb->len + vlan_hlen + vnet_hdr_sz; |
| 1992 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1993 | if (!(tun->flags & IFF_NO_PI)) { |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1994 | if (iov_iter_count(iter) < sizeof(pi)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1995 | return -EINVAL; |
| 1996 | |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1997 | total += sizeof(pi); |
| 1998 | if (iov_iter_count(iter) < total) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1999 | /* Packet will be striped */ |
| 2000 | pi.flags |= TUN_PKT_STRIP; |
| 2001 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 2002 | |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 2003 | if (copy_to_iter(&pi, sizeof(pi), iter) != sizeof(pi)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2004 | return -EFAULT; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 2005 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2006 | |
Herbert Xu | 2eb783c | 2014-11-03 04:30:14 +0800 | [diff] [blame] | 2007 | if (vnet_hdr_sz) { |
Jarno Rajahalme | 9403cd7 | 2016-11-18 15:40:40 -0800 | [diff] [blame] | 2008 | struct virtio_net_hdr gso; |
Mike Rapoport | 3416609 | 2016-06-08 16:09:20 +0300 | [diff] [blame] | 2009 | |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 2010 | if (iov_iter_count(iter) < vnet_hdr_sz) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 2011 | return -EINVAL; |
| 2012 | |
Jarno Rajahalme | 3e9e40e | 2016-11-18 15:40:38 -0800 | [diff] [blame] | 2013 | if (virtio_net_hdr_from_skb(skb, &gso, |
Willem de Bruijn | fd3a886 | 2018-06-06 11:23:01 -0400 | [diff] [blame] | 2014 | tun_is_little_endian(tun), true, |
| 2015 | vlan_hlen)) { |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 2016 | struct skb_shared_info *sinfo = skb_shinfo(skb); |
Mike Rapoport | 3416609 | 2016-06-08 16:09:20 +0300 | [diff] [blame] | 2017 | pr_err("unexpected GSO type: " |
| 2018 | "0x%x, gso_size %d, hdr_len %d\n", |
| 2019 | sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size), |
| 2020 | tun16_to_cpu(tun, gso.hdr_len)); |
| 2021 | print_hex_dump(KERN_ERR, "tun: ", |
| 2022 | DUMP_PREFIX_NONE, |
| 2023 | 16, 1, skb->head, |
| 2024 | min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true); |
| 2025 | WARN_ON_ONCE(1); |
| 2026 | return -EINVAL; |
| 2027 | } |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 2028 | |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 2029 | if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso)) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 2030 | return -EFAULT; |
Jason Wang | 8c847d2 | 2014-11-13 16:54:14 +0800 | [diff] [blame] | 2031 | |
| 2032 | iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 2033 | } |
| 2034 | |
Herbert Xu | a8f9bfd | 2014-11-03 04:30:13 +0800 | [diff] [blame] | 2035 | if (vlan_hlen) { |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 2036 | int ret; |
Jason Wang | aff3d70 | 2018-01-16 16:31:02 +0800 | [diff] [blame] | 2037 | struct veth veth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | |
Jason Wang | 6680ec6 | 2013-07-25 13:00:33 +0800 | [diff] [blame] | 2039 | veth.h_vlan_proto = skb->vlan_proto; |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 2040 | veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | |
Jason Wang | 6680ec6 | 2013-07-25 13:00:33 +0800 | [diff] [blame] | 2042 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); |
Jason Wang | 6680ec6 | 2013-07-25 13:00:33 +0800 | [diff] [blame] | 2043 | |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 2044 | ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset); |
| 2045 | if (ret || !iov_iter_count(iter)) |
Jason Wang | 6680ec6 | 2013-07-25 13:00:33 +0800 | [diff] [blame] | 2046 | goto done; |
| 2047 | |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 2048 | ret = copy_to_iter(&veth, sizeof(veth), iter); |
| 2049 | if (ret != sizeof(veth) || !iov_iter_count(iter)) |
Jason Wang | 6680ec6 | 2013-07-25 13:00:33 +0800 | [diff] [blame] | 2050 | goto done; |
| 2051 | } |
| 2052 | |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 2053 | skb_copy_datagram_iter(skb, vlan_offset, iter, skb->len - vlan_offset); |
Jason Wang | 6680ec6 | 2013-07-25 13:00:33 +0800 | [diff] [blame] | 2054 | |
| 2055 | done: |
Paolo Abeni | 608b997 | 2016-04-13 10:52:20 +0200 | [diff] [blame] | 2056 | /* caller is in process context, */ |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 2057 | preempt_disable(); |
| 2058 | dev_sw_netstats_tx_add(tun->dev, 1, skb->len + vlan_hlen); |
| 2059 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2060 | |
| 2061 | return total; |
| 2062 | } |
| 2063 | |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2064 | static void *tun_ring_recv(struct tun_file *tfile, int noblock, int *err) |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 2065 | { |
| 2066 | DECLARE_WAITQUEUE(wait, current); |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2067 | void *ptr = NULL; |
Jason Wang | f48cc6b | 2016-07-04 13:53:38 +0800 | [diff] [blame] | 2068 | int error = 0; |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 2069 | |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2070 | ptr = ptr_ring_consume(&tfile->tx_ring); |
| 2071 | if (ptr) |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 2072 | goto out; |
| 2073 | if (noblock) { |
Jason Wang | f48cc6b | 2016-07-04 13:53:38 +0800 | [diff] [blame] | 2074 | error = -EAGAIN; |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 2075 | goto out; |
| 2076 | } |
| 2077 | |
Al Viro | 333f790 | 2019-07-05 20:14:16 +0100 | [diff] [blame] | 2078 | add_wait_queue(&tfile->socket.wq.wait, &wait); |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 2079 | |
| 2080 | while (1) { |
Timur Celik | 71828b2 | 2019-02-23 12:53:13 +0100 | [diff] [blame] | 2081 | set_current_state(TASK_INTERRUPTIBLE); |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2082 | ptr = ptr_ring_consume(&tfile->tx_ring); |
| 2083 | if (ptr) |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 2084 | break; |
| 2085 | if (signal_pending(current)) { |
Jason Wang | f48cc6b | 2016-07-04 13:53:38 +0800 | [diff] [blame] | 2086 | error = -ERESTARTSYS; |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 2087 | break; |
| 2088 | } |
| 2089 | if (tfile->socket.sk->sk_shutdown & RCV_SHUTDOWN) { |
Jason Wang | f48cc6b | 2016-07-04 13:53:38 +0800 | [diff] [blame] | 2090 | error = -EFAULT; |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 2091 | break; |
| 2092 | } |
| 2093 | |
| 2094 | schedule(); |
| 2095 | } |
| 2096 | |
Timur Celik | ecef67c | 2019-02-25 21:13:13 +0100 | [diff] [blame] | 2097 | __set_current_state(TASK_RUNNING); |
Al Viro | 333f790 | 2019-07-05 20:14:16 +0100 | [diff] [blame] | 2098 | remove_wait_queue(&tfile->socket.wq.wait, &wait); |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 2099 | |
| 2100 | out: |
Jason Wang | f48cc6b | 2016-07-04 13:53:38 +0800 | [diff] [blame] | 2101 | *err = error; |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2102 | return ptr; |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 2103 | } |
| 2104 | |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2105 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
Al Viro | 9b06703 | 2014-11-07 13:52:07 -0500 | [diff] [blame] | 2106 | struct iov_iter *to, |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2107 | int noblock, void *ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2108 | { |
Al Viro | 9b06703 | 2014-11-07 13:52:07 -0500 | [diff] [blame] | 2109 | ssize_t ret; |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 2110 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2111 | |
Wei Xu | c33ee15 | 2017-12-01 05:10:37 -0500 | [diff] [blame] | 2112 | if (!iov_iter_count(to)) { |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2113 | tun_ptr_free(ptr); |
Al Viro | 9b06703 | 2014-11-07 13:52:07 -0500 | [diff] [blame] | 2114 | return 0; |
Wei Xu | c33ee15 | 2017-12-01 05:10:37 -0500 | [diff] [blame] | 2115 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2116 | |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2117 | if (!ptr) { |
Jason Wang | ac77cfd | 2017-05-17 12:14:43 +0800 | [diff] [blame] | 2118 | /* Read frames from ring */ |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2119 | ptr = tun_ring_recv(tfile, noblock, &err); |
| 2120 | if (!ptr) |
Jason Wang | ac77cfd | 2017-05-17 12:14:43 +0800 | [diff] [blame] | 2121 | return err; |
| 2122 | } |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 2123 | |
Jesper Dangaard Brouer | 1ffcbc8 | 2018-04-17 16:45:47 +0200 | [diff] [blame] | 2124 | if (tun_is_xdp_frame(ptr)) { |
| 2125 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2126 | |
Jesper Dangaard Brouer | 1ffcbc8 | 2018-04-17 16:45:47 +0200 | [diff] [blame] | 2127 | ret = tun_put_user_xdp(tun, tfile, xdpf, to); |
Jesper Dangaard Brouer | 0399309 | 2018-04-17 16:46:32 +0200 | [diff] [blame] | 2128 | xdp_return_frame(xdpf); |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2129 | } else { |
| 2130 | struct sk_buff *skb = ptr; |
| 2131 | |
| 2132 | ret = tun_put_user(tun, tfile, skb, to); |
| 2133 | if (unlikely(ret < 0)) |
| 2134 | kfree_skb(skb); |
| 2135 | else |
| 2136 | consume_skb(skb); |
| 2137 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 2139 | return ret; |
| 2140 | } |
| 2141 | |
Al Viro | 9b06703 | 2014-11-07 13:52:07 -0500 | [diff] [blame] | 2142 | static ssize_t tun_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 2143 | { |
| 2144 | struct file *file = iocb->ki_filp; |
| 2145 | struct tun_file *tfile = file->private_data; |
yuan linyu | 9484dc7 | 2017-09-23 22:36:52 +0800 | [diff] [blame] | 2146 | struct tun_struct *tun = tun_get(tfile); |
Al Viro | 9b06703 | 2014-11-07 13:52:07 -0500 | [diff] [blame] | 2147 | ssize_t len = iov_iter_count(to), ret; |
Jens Axboe | 5aac039 | 2020-11-20 07:59:54 -0700 | [diff] [blame] | 2148 | int noblock = 0; |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 2149 | |
| 2150 | if (!tun) |
| 2151 | return -EBADFD; |
Jens Axboe | 5aac039 | 2020-11-20 07:59:54 -0700 | [diff] [blame] | 2152 | |
| 2153 | if ((file->f_flags & O_NONBLOCK) || (iocb->ki_flags & IOCB_NOWAIT)) |
| 2154 | noblock = 1; |
| 2155 | |
| 2156 | ret = tun_do_read(tun, tfile, to, noblock, NULL); |
David S. Miller | 42404c0 | 2013-12-10 22:05:45 -0500 | [diff] [blame] | 2157 | ret = min_t(ssize_t, ret, len); |
Zhi Yong Wu | d0b7da8a | 2013-12-06 14:16:51 +0800 | [diff] [blame] | 2158 | if (ret > 0) |
| 2159 | iocb->ki_pos = ret; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 2160 | tun_put(tun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2161 | return ret; |
| 2162 | } |
| 2163 | |
Jason Wang | cd5681d | 2018-01-16 16:31:01 +0800 | [diff] [blame] | 2164 | static void tun_prog_free(struct rcu_head *rcu) |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 2165 | { |
Jason Wang | cd5681d | 2018-01-16 16:31:01 +0800 | [diff] [blame] | 2166 | struct tun_prog *prog = container_of(rcu, struct tun_prog, rcu); |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 2167 | |
| 2168 | bpf_prog_destroy(prog->prog); |
| 2169 | kfree(prog); |
| 2170 | } |
| 2171 | |
Jason Wang | 9d6474e | 2018-01-22 10:55:38 +0800 | [diff] [blame] | 2172 | static int __tun_set_ebpf(struct tun_struct *tun, |
| 2173 | struct tun_prog __rcu **prog_p, |
Jason Wang | cd5681d | 2018-01-16 16:31:01 +0800 | [diff] [blame] | 2174 | struct bpf_prog *prog) |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 2175 | { |
Jason Wang | cd5681d | 2018-01-16 16:31:01 +0800 | [diff] [blame] | 2176 | struct tun_prog *old, *new = NULL; |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 2177 | |
| 2178 | if (prog) { |
| 2179 | new = kmalloc(sizeof(*new), GFP_KERNEL); |
| 2180 | if (!new) |
| 2181 | return -ENOMEM; |
| 2182 | new->prog = prog; |
| 2183 | } |
| 2184 | |
Jason Wang | 124da8f | 2017-12-08 12:02:30 +0800 | [diff] [blame] | 2185 | spin_lock_bh(&tun->lock); |
Jason Wang | cd5681d | 2018-01-16 16:31:01 +0800 | [diff] [blame] | 2186 | old = rcu_dereference_protected(*prog_p, |
Jason Wang | 124da8f | 2017-12-08 12:02:30 +0800 | [diff] [blame] | 2187 | lockdep_is_held(&tun->lock)); |
Jason Wang | cd5681d | 2018-01-16 16:31:01 +0800 | [diff] [blame] | 2188 | rcu_assign_pointer(*prog_p, new); |
Jason Wang | 124da8f | 2017-12-08 12:02:30 +0800 | [diff] [blame] | 2189 | spin_unlock_bh(&tun->lock); |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 2190 | |
| 2191 | if (old) |
Jason Wang | cd5681d | 2018-01-16 16:31:01 +0800 | [diff] [blame] | 2192 | call_rcu(&old->rcu, tun_prog_free); |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 2193 | |
| 2194 | return 0; |
| 2195 | } |
| 2196 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 2197 | static void tun_free_netdev(struct net_device *dev) |
| 2198 | { |
| 2199 | struct tun_struct *tun = netdev_priv(dev); |
| 2200 | |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 2201 | BUG_ON(!(list_empty(&tun->disabled))); |
Eric Dumazet | 11fc7d5 | 2019-10-07 12:21:05 -0700 | [diff] [blame] | 2202 | |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 2203 | free_percpu(dev->tstats); |
| 2204 | /* We clear tstats so that tun_set_iff() can tell if |
Eric Dumazet | 11fc7d5 | 2019-10-07 12:21:05 -0700 | [diff] [blame] | 2205 | * tun_free_netdev() has been called from register_netdevice(). |
| 2206 | */ |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 2207 | dev->tstats = NULL; |
Eric Dumazet | 11fc7d5 | 2019-10-07 12:21:05 -0700 | [diff] [blame] | 2208 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 2209 | tun_flow_uninit(tun); |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 2210 | security_tun_dev_free_security(tun->security); |
Jason Wang | cd5681d | 2018-01-16 16:31:01 +0800 | [diff] [blame] | 2211 | __tun_set_ebpf(tun, &tun->steering_prog, NULL); |
Jason Wang | aff3d70 | 2018-01-16 16:31:02 +0800 | [diff] [blame] | 2212 | __tun_set_ebpf(tun, &tun->filter_prog, NULL); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 2213 | } |
| 2214 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2215 | static void tun_setup(struct net_device *dev) |
| 2216 | { |
| 2217 | struct tun_struct *tun = netdev_priv(dev); |
| 2218 | |
Eric W. Biederman | 0625c88 | 2012-02-07 16:48:55 -0800 | [diff] [blame] | 2219 | tun->owner = INVALID_UID; |
| 2220 | tun->group = INVALID_GID; |
Chas Williams | 4e24f2d | 2018-06-02 17:49:53 -0400 | [diff] [blame] | 2221 | tun_default_link_ksettings(dev, &tun->link_ksettings); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2222 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2223 | dev->ethtool_ops = &tun_ethtool_ops; |
David S. Miller | cf124db | 2017-05-08 12:52:56 -0400 | [diff] [blame] | 2224 | dev->needs_free_netdev = true; |
| 2225 | dev->priv_destructor = tun_free_netdev; |
Jason Wang | 016adb7 | 2016-04-08 13:26:48 +0800 | [diff] [blame] | 2226 | /* We prefer our own queue length */ |
| 2227 | dev->tx_queue_len = TUN_READQ_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2228 | } |
| 2229 | |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 2230 | /* Trivial set of netlink ops to allow deleting tun or tap |
| 2231 | * device with netlink. |
| 2232 | */ |
Matthias Schiffer | a8b8a889 | 2017-06-25 23:56:01 +0200 | [diff] [blame] | 2233 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[], |
| 2234 | struct netlink_ext_ack *extack) |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 2235 | { |
Nicolas Dichtel | 35b827b | 2018-11-29 14:45:39 +0100 | [diff] [blame] | 2236 | NL_SET_ERR_MSG(extack, |
| 2237 | "tun/tap creation via rtnetlink is not supported."); |
| 2238 | return -EOPNOTSUPP; |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 2239 | } |
| 2240 | |
Sabrina Dubroca | 1ec010e | 2018-02-16 11:03:07 +0100 | [diff] [blame] | 2241 | static size_t tun_get_size(const struct net_device *dev) |
| 2242 | { |
| 2243 | BUILD_BUG_ON(sizeof(u32) != sizeof(uid_t)); |
| 2244 | BUILD_BUG_ON(sizeof(u32) != sizeof(gid_t)); |
| 2245 | |
| 2246 | return nla_total_size(sizeof(uid_t)) + /* OWNER */ |
| 2247 | nla_total_size(sizeof(gid_t)) + /* GROUP */ |
| 2248 | nla_total_size(sizeof(u8)) + /* TYPE */ |
| 2249 | nla_total_size(sizeof(u8)) + /* PI */ |
| 2250 | nla_total_size(sizeof(u8)) + /* VNET_HDR */ |
| 2251 | nla_total_size(sizeof(u8)) + /* PERSIST */ |
| 2252 | nla_total_size(sizeof(u8)) + /* MULTI_QUEUE */ |
| 2253 | nla_total_size(sizeof(u32)) + /* NUM_QUEUES */ |
| 2254 | nla_total_size(sizeof(u32)) + /* NUM_DISABLED_QUEUES */ |
| 2255 | 0; |
| 2256 | } |
| 2257 | |
| 2258 | static int tun_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| 2259 | { |
| 2260 | struct tun_struct *tun = netdev_priv(dev); |
| 2261 | |
| 2262 | if (nla_put_u8(skb, IFLA_TUN_TYPE, tun->flags & TUN_TYPE_MASK)) |
| 2263 | goto nla_put_failure; |
| 2264 | if (uid_valid(tun->owner) && |
| 2265 | nla_put_u32(skb, IFLA_TUN_OWNER, |
| 2266 | from_kuid_munged(current_user_ns(), tun->owner))) |
| 2267 | goto nla_put_failure; |
| 2268 | if (gid_valid(tun->group) && |
| 2269 | nla_put_u32(skb, IFLA_TUN_GROUP, |
| 2270 | from_kgid_munged(current_user_ns(), tun->group))) |
| 2271 | goto nla_put_failure; |
| 2272 | if (nla_put_u8(skb, IFLA_TUN_PI, !(tun->flags & IFF_NO_PI))) |
| 2273 | goto nla_put_failure; |
| 2274 | if (nla_put_u8(skb, IFLA_TUN_VNET_HDR, !!(tun->flags & IFF_VNET_HDR))) |
| 2275 | goto nla_put_failure; |
| 2276 | if (nla_put_u8(skb, IFLA_TUN_PERSIST, !!(tun->flags & IFF_PERSIST))) |
| 2277 | goto nla_put_failure; |
| 2278 | if (nla_put_u8(skb, IFLA_TUN_MULTI_QUEUE, |
| 2279 | !!(tun->flags & IFF_MULTI_QUEUE))) |
| 2280 | goto nla_put_failure; |
| 2281 | if (tun->flags & IFF_MULTI_QUEUE) { |
| 2282 | if (nla_put_u32(skb, IFLA_TUN_NUM_QUEUES, tun->numqueues)) |
| 2283 | goto nla_put_failure; |
| 2284 | if (nla_put_u32(skb, IFLA_TUN_NUM_DISABLED_QUEUES, |
| 2285 | tun->numdisabled)) |
| 2286 | goto nla_put_failure; |
| 2287 | } |
| 2288 | |
| 2289 | return 0; |
| 2290 | |
| 2291 | nla_put_failure: |
| 2292 | return -EMSGSIZE; |
| 2293 | } |
| 2294 | |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 2295 | static struct rtnl_link_ops tun_link_ops __read_mostly = { |
| 2296 | .kind = DRV_NAME, |
| 2297 | .priv_size = sizeof(struct tun_struct), |
| 2298 | .setup = tun_setup, |
| 2299 | .validate = tun_validate, |
Sabrina Dubroca | 1ec010e | 2018-02-16 11:03:07 +0100 | [diff] [blame] | 2300 | .get_size = tun_get_size, |
| 2301 | .fill_info = tun_fill_info, |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 2302 | }; |
| 2303 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 2304 | static void tun_sock_write_space(struct sock *sk) |
| 2305 | { |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2306 | struct tun_file *tfile; |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2307 | wait_queue_head_t *wqueue; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 2308 | |
| 2309 | if (!sock_writeable(sk)) |
| 2310 | return; |
| 2311 | |
Eric Dumazet | 9cd3e07 | 2015-11-29 20:03:10 -0800 | [diff] [blame] | 2312 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 2313 | return; |
| 2314 | |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2315 | wqueue = sk_sleep(sk); |
| 2316 | if (wqueue && waitqueue_active(wqueue)) |
Linus Torvalds | a9a0884 | 2018-02-11 14:34:03 -0800 | [diff] [blame] | 2317 | wake_up_interruptible_sync_poll(wqueue, EPOLLOUT | |
| 2318 | EPOLLWRNORM | EPOLLWRBAND); |
Herbert Xu | c722c62 | 2009-06-03 21:45:55 -0700 | [diff] [blame] | 2319 | |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2320 | tfile = container_of(sk, struct tun_file, sk); |
| 2321 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 2322 | } |
| 2323 | |
Jason Wang | f9e06c4 | 2018-11-15 17:43:10 +0800 | [diff] [blame] | 2324 | static void tun_put_page(struct tun_page *tpage) |
| 2325 | { |
| 2326 | if (tpage->page) |
| 2327 | __page_frag_cache_drain(tpage->page, tpage->count); |
| 2328 | } |
| 2329 | |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2330 | static int tun_xdp_one(struct tun_struct *tun, |
| 2331 | struct tun_file *tfile, |
Jason Wang | f9e06c4 | 2018-11-15 17:43:10 +0800 | [diff] [blame] | 2332 | struct xdp_buff *xdp, int *flush, |
| 2333 | struct tun_page *tpage) |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2334 | { |
Prashant Bhole | 4e4b08e | 2018-12-03 18:09:24 +0900 | [diff] [blame] | 2335 | unsigned int datasize = xdp->data_end - xdp->data; |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2336 | struct tun_xdp_hdr *hdr = xdp->data_hard_start; |
| 2337 | struct virtio_net_hdr *gso = &hdr->gso; |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2338 | struct bpf_prog *xdp_prog; |
| 2339 | struct sk_buff *skb = NULL; |
| 2340 | u32 rxhash = 0, act; |
| 2341 | int buflen = hdr->buflen; |
| 2342 | int err = 0; |
| 2343 | bool skb_xdp = false; |
Jason Wang | f9e06c4 | 2018-11-15 17:43:10 +0800 | [diff] [blame] | 2344 | struct page *page; |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2345 | |
| 2346 | xdp_prog = rcu_dereference(tun->xdp_prog); |
| 2347 | if (xdp_prog) { |
| 2348 | if (gso->gso_type) { |
| 2349 | skb_xdp = true; |
| 2350 | goto build; |
| 2351 | } |
Lorenzo Bianconi | 43b5169 | 2020-12-22 22:09:28 +0100 | [diff] [blame] | 2352 | |
| 2353 | xdp_init_buff(xdp, buflen, &tfile->xdp_rxq); |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2354 | xdp_set_data_meta_invalid(xdp); |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2355 | |
| 2356 | act = bpf_prog_run_xdp(xdp_prog, xdp); |
| 2357 | err = tun_xdp_act(tun, xdp_prog, xdp, act); |
| 2358 | if (err < 0) { |
| 2359 | put_page(virt_to_head_page(xdp->data)); |
| 2360 | return err; |
| 2361 | } |
| 2362 | |
| 2363 | switch (err) { |
| 2364 | case XDP_REDIRECT: |
| 2365 | *flush = true; |
Gustavo A. R. Silva | df561f66 | 2020-08-23 17:36:59 -0500 | [diff] [blame] | 2366 | fallthrough; |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2367 | case XDP_TX: |
| 2368 | return 0; |
| 2369 | case XDP_PASS: |
| 2370 | break; |
| 2371 | default: |
Jason Wang | f9e06c4 | 2018-11-15 17:43:10 +0800 | [diff] [blame] | 2372 | page = virt_to_head_page(xdp->data); |
| 2373 | if (tpage->page == page) { |
| 2374 | ++tpage->count; |
| 2375 | } else { |
| 2376 | tun_put_page(tpage); |
| 2377 | tpage->page = page; |
| 2378 | tpage->count = 1; |
| 2379 | } |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2380 | return 0; |
| 2381 | } |
| 2382 | } |
| 2383 | |
| 2384 | build: |
| 2385 | skb = build_skb(xdp->data_hard_start, buflen); |
| 2386 | if (!skb) { |
| 2387 | err = -ENOMEM; |
| 2388 | goto out; |
| 2389 | } |
| 2390 | |
| 2391 | skb_reserve(skb, xdp->data - xdp->data_hard_start); |
| 2392 | skb_put(skb, xdp->data_end - xdp->data); |
| 2393 | |
| 2394 | if (virtio_net_hdr_to_skb(skb, gso, tun_is_little_endian(tun))) { |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 2395 | atomic_long_inc(&tun->rx_frame_errors); |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2396 | kfree_skb(skb); |
| 2397 | err = -EINVAL; |
| 2398 | goto out; |
| 2399 | } |
| 2400 | |
| 2401 | skb->protocol = eth_type_trans(skb, tun->dev); |
| 2402 | skb_reset_network_header(skb); |
Maxim Mikityanskiy | d2aa125 | 2019-02-21 12:39:57 +0000 | [diff] [blame] | 2403 | skb_probe_transport_header(skb); |
Gilberto Bertin | 3fe260e | 2020-04-10 18:20:59 +0200 | [diff] [blame] | 2404 | skb_record_rx_queue(skb, tfile->queue_index); |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2405 | |
| 2406 | if (skb_xdp) { |
| 2407 | err = do_xdp_generic(xdp_prog, skb); |
| 2408 | if (err != XDP_PASS) |
| 2409 | goto out; |
| 2410 | } |
| 2411 | |
Paolo Abeni | f29eb2a | 2018-11-07 10:34:36 +0100 | [diff] [blame] | 2412 | if (!rcu_dereference(tun->steering_prog) && tun->numqueues > 1 && |
| 2413 | !tfile->detached) |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2414 | rxhash = __skb_get_hash_symmetric(skb); |
| 2415 | |
| 2416 | netif_receive_skb(skb); |
| 2417 | |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 2418 | /* No need to disable preemption here since this function is |
Prashant Bhole | 6342ca6 | 2018-12-11 11:43:07 +0900 | [diff] [blame] | 2419 | * always called with bh disabled |
| 2420 | */ |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 2421 | dev_sw_netstats_rx_add(tun->dev, datasize); |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2422 | |
| 2423 | if (rxhash) |
| 2424 | tun_flow_update(tun, rxhash, tfile); |
| 2425 | |
| 2426 | out: |
| 2427 | return err; |
| 2428 | } |
| 2429 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2430 | static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 2431 | { |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2432 | int ret, i; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2433 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
yuan linyu | 9484dc7 | 2017-09-23 22:36:52 +0800 | [diff] [blame] | 2434 | struct tun_struct *tun = tun_get(tfile); |
Jason Wang | fe8dd45 | 2018-09-12 11:17:06 +0800 | [diff] [blame] | 2435 | struct tun_msg_ctl *ctl = m->msg_control; |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2436 | struct xdp_buff *xdp; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2437 | |
| 2438 | if (!tun) |
| 2439 | return -EBADFD; |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 2440 | |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2441 | if (ctl && (ctl->type == TUN_MSG_PTR)) { |
David S. Miller | 6f0271d | 2018-11-17 16:53:46 -0800 | [diff] [blame] | 2442 | struct tun_page tpage; |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2443 | int n = ctl->num; |
| 2444 | int flush = 0; |
| 2445 | |
David S. Miller | 6f0271d | 2018-11-17 16:53:46 -0800 | [diff] [blame] | 2446 | memset(&tpage, 0, sizeof(tpage)); |
| 2447 | |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2448 | local_bh_disable(); |
| 2449 | rcu_read_lock(); |
| 2450 | |
| 2451 | for (i = 0; i < n; i++) { |
| 2452 | xdp = &((struct xdp_buff *)ctl->ptr)[i]; |
Jason Wang | f9e06c4 | 2018-11-15 17:43:10 +0800 | [diff] [blame] | 2453 | tun_xdp_one(tun, tfile, xdp, &flush, &tpage); |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2454 | } |
| 2455 | |
| 2456 | if (flush) |
Toke Høiland-Jørgensen | 1d23388 | 2020-01-16 16:14:45 +0100 | [diff] [blame] | 2457 | xdp_do_flush(); |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2458 | |
| 2459 | rcu_read_unlock(); |
| 2460 | local_bh_enable(); |
| 2461 | |
Jason Wang | f9e06c4 | 2018-11-15 17:43:10 +0800 | [diff] [blame] | 2462 | tun_put_page(&tpage); |
| 2463 | |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2464 | ret = total_len; |
| 2465 | goto out; |
| 2466 | } |
Jason Wang | fe8dd45 | 2018-09-12 11:17:06 +0800 | [diff] [blame] | 2467 | |
| 2468 | ret = tun_get_user(tun, tfile, ctl ? ctl->ptr : NULL, &m->msg_iter, |
Jason Wang | 5503fce | 2017-01-18 15:02:03 +0800 | [diff] [blame] | 2469 | m->msg_flags & MSG_DONTWAIT, |
| 2470 | m->msg_flags & MSG_MORE); |
Jason Wang | 043d222 | 2018-09-12 11:17:07 +0800 | [diff] [blame] | 2471 | out: |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2472 | tun_put(tun); |
| 2473 | return ret; |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 2474 | } |
| 2475 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2476 | static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len, |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 2477 | int flags) |
| 2478 | { |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2479 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
yuan linyu | 9484dc7 | 2017-09-23 22:36:52 +0800 | [diff] [blame] | 2480 | struct tun_struct *tun = tun_get(tfile); |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2481 | void *ptr = m->msg_control; |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 2482 | int ret; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2483 | |
Wei Xu | c33ee15 | 2017-12-01 05:10:37 -0500 | [diff] [blame] | 2484 | if (!tun) { |
| 2485 | ret = -EBADFD; |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2486 | goto out_free; |
Wei Xu | c33ee15 | 2017-12-01 05:10:37 -0500 | [diff] [blame] | 2487 | } |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2488 | |
Richard Cochran | eda2977 | 2013-07-19 19:40:10 +0200 | [diff] [blame] | 2489 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) { |
Gao feng | 3811ae7 | 2013-04-24 21:59:23 +0000 | [diff] [blame] | 2490 | ret = -EINVAL; |
Wei Xu | c33ee15 | 2017-12-01 05:10:37 -0500 | [diff] [blame] | 2491 | goto out_put_tun; |
Gao feng | 3811ae7 | 2013-04-24 21:59:23 +0000 | [diff] [blame] | 2492 | } |
Richard Cochran | eda2977 | 2013-07-19 19:40:10 +0200 | [diff] [blame] | 2493 | if (flags & MSG_ERRQUEUE) { |
| 2494 | ret = sock_recv_errqueue(sock->sk, m, total_len, |
| 2495 | SOL_PACKET, TUN_TX_TIMESTAMP); |
| 2496 | goto out; |
| 2497 | } |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2498 | ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT, ptr); |
Alex Gartrell | 8789793 | 2014-12-25 23:05:03 -0800 | [diff] [blame] | 2499 | if (ret > (ssize_t)total_len) { |
David S. Miller | 42404c0 | 2013-12-10 22:05:45 -0500 | [diff] [blame] | 2500 | m->msg_flags |= MSG_TRUNC; |
| 2501 | ret = flags & MSG_TRUNC ? ret : total_len; |
| 2502 | } |
Gao feng | 3811ae7 | 2013-04-24 21:59:23 +0000 | [diff] [blame] | 2503 | out: |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2504 | tun_put(tun); |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 2505 | return ret; |
Wei Xu | c33ee15 | 2017-12-01 05:10:37 -0500 | [diff] [blame] | 2506 | |
| 2507 | out_put_tun: |
| 2508 | tun_put(tun); |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2509 | out_free: |
| 2510 | tun_ptr_free(ptr); |
Wei Xu | c33ee15 | 2017-12-01 05:10:37 -0500 | [diff] [blame] | 2511 | return ret; |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 2512 | } |
| 2513 | |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2514 | static int tun_ptr_peek_len(void *ptr) |
| 2515 | { |
| 2516 | if (likely(ptr)) { |
Jesper Dangaard Brouer | 1ffcbc8 | 2018-04-17 16:45:47 +0200 | [diff] [blame] | 2517 | if (tun_is_xdp_frame(ptr)) { |
| 2518 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2519 | |
Jesper Dangaard Brouer | 1ffcbc8 | 2018-04-17 16:45:47 +0200 | [diff] [blame] | 2520 | return xdpf->len; |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2521 | } |
| 2522 | return __skb_array_len_with_tag(ptr); |
| 2523 | } else { |
| 2524 | return 0; |
| 2525 | } |
| 2526 | } |
| 2527 | |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 2528 | static int tun_peek_len(struct socket *sock) |
| 2529 | { |
| 2530 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
| 2531 | struct tun_struct *tun; |
| 2532 | int ret = 0; |
| 2533 | |
yuan linyu | 9484dc7 | 2017-09-23 22:36:52 +0800 | [diff] [blame] | 2534 | tun = tun_get(tfile); |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 2535 | if (!tun) |
| 2536 | return 0; |
| 2537 | |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 2538 | ret = PTR_RING_PEEK_CALL(&tfile->tx_ring, tun_ptr_peek_len); |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 2539 | tun_put(tun); |
| 2540 | |
| 2541 | return ret; |
| 2542 | } |
| 2543 | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 2544 | /* Ops structure to mimic raw sockets with tun */ |
| 2545 | static const struct proto_ops tun_socket_ops = { |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 2546 | .peek_len = tun_peek_len, |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 2547 | .sendmsg = tun_sendmsg, |
| 2548 | .recvmsg = tun_recvmsg, |
| 2549 | }; |
| 2550 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 2551 | static struct proto tun_proto = { |
| 2552 | .name = "tun", |
| 2553 | .owner = THIS_MODULE, |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2554 | .obj_size = sizeof(struct tun_file), |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 2555 | }; |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 2556 | |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 2557 | static int tun_flags(struct tun_struct *tun) |
| 2558 | { |
Michael S. Tsirkin | 031f5e03 | 2014-11-19 14:44:40 +0200 | [diff] [blame] | 2559 | return tun->flags & (TUN_FEATURES | IFF_PERSIST | IFF_TUN | IFF_TAP); |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 2560 | } |
| 2561 | |
YueHaibing | bc6d076 | 2021-05-19 10:38:50 +0800 | [diff] [blame^] | 2562 | static ssize_t tun_flags_show(struct device *dev, struct device_attribute *attr, |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 2563 | char *buf) |
| 2564 | { |
| 2565 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); |
| 2566 | return sprintf(buf, "0x%x\n", tun_flags(tun)); |
| 2567 | } |
| 2568 | |
YueHaibing | bc6d076 | 2021-05-19 10:38:50 +0800 | [diff] [blame^] | 2569 | static ssize_t owner_show(struct device *dev, struct device_attribute *attr, |
| 2570 | char *buf) |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 2571 | { |
| 2572 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); |
Eric W. Biederman | 0625c88 | 2012-02-07 16:48:55 -0800 | [diff] [blame] | 2573 | return uid_valid(tun->owner)? |
| 2574 | sprintf(buf, "%u\n", |
| 2575 | from_kuid_munged(current_user_ns(), tun->owner)): |
| 2576 | sprintf(buf, "-1\n"); |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 2577 | } |
| 2578 | |
YueHaibing | bc6d076 | 2021-05-19 10:38:50 +0800 | [diff] [blame^] | 2579 | static ssize_t group_show(struct device *dev, struct device_attribute *attr, |
| 2580 | char *buf) |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 2581 | { |
| 2582 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); |
Eric W. Biederman | 0625c88 | 2012-02-07 16:48:55 -0800 | [diff] [blame] | 2583 | return gid_valid(tun->group) ? |
| 2584 | sprintf(buf, "%u\n", |
| 2585 | from_kgid_munged(current_user_ns(), tun->group)): |
| 2586 | sprintf(buf, "-1\n"); |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 2587 | } |
| 2588 | |
YueHaibing | bc6d076 | 2021-05-19 10:38:50 +0800 | [diff] [blame^] | 2589 | static DEVICE_ATTR_RO(tun_flags); |
| 2590 | static DEVICE_ATTR_RO(owner); |
| 2591 | static DEVICE_ATTR_RO(group); |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 2592 | |
Takashi Iwai | c4d33e2 | 2015-02-04 14:37:34 +0100 | [diff] [blame] | 2593 | static struct attribute *tun_dev_attrs[] = { |
| 2594 | &dev_attr_tun_flags.attr, |
| 2595 | &dev_attr_owner.attr, |
| 2596 | &dev_attr_group.attr, |
| 2597 | NULL |
| 2598 | }; |
| 2599 | |
| 2600 | static const struct attribute_group tun_attr_group = { |
| 2601 | .attrs = tun_dev_attrs |
| 2602 | }; |
| 2603 | |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 2604 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2605 | { |
| 2606 | struct tun_struct *tun; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2607 | struct tun_file *tfile = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2608 | struct net_device *dev; |
| 2609 | int err; |
| 2610 | |
Jason Wang | 7c0c3b1 | 2013-01-11 16:59:33 +0000 | [diff] [blame] | 2611 | if (tfile->detached) |
| 2612 | return -EINVAL; |
| 2613 | |
Petar Penkov | 90e33d4 | 2017-09-22 13:49:15 -0700 | [diff] [blame] | 2614 | if ((ifr->ifr_flags & IFF_NAPI_FRAGS)) { |
| 2615 | if (!capable(CAP_NET_ADMIN)) |
| 2616 | return -EPERM; |
| 2617 | |
| 2618 | if (!(ifr->ifr_flags & IFF_NAPI) || |
| 2619 | (ifr->ifr_flags & TUN_TYPE_MASK) != IFF_TAP) |
| 2620 | return -EINVAL; |
| 2621 | } |
| 2622 | |
Eric W. Biederman | 74a3e5a | 2009-01-20 10:56:20 +0000 | [diff] [blame] | 2623 | dev = __dev_get_by_name(net, ifr->ifr_name); |
| 2624 | if (dev) { |
David Woodhouse | f85ba78 | 2009-04-27 03:23:54 -0700 | [diff] [blame] | 2625 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
| 2626 | return -EBUSY; |
Eric W. Biederman | 74a3e5a | 2009-01-20 10:56:20 +0000 | [diff] [blame] | 2627 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
| 2628 | tun = netdev_priv(dev); |
| 2629 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) |
| 2630 | tun = netdev_priv(dev); |
| 2631 | else |
| 2632 | return -EINVAL; |
| 2633 | |
Jason Wang | 8e6d91a | 2013-05-28 18:32:11 +0000 | [diff] [blame] | 2634 | if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) != |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 2635 | !!(tun->flags & IFF_MULTI_QUEUE)) |
Jason Wang | 8e6d91a | 2013-05-28 18:32:11 +0000 | [diff] [blame] | 2636 | return -EINVAL; |
| 2637 | |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 2638 | if (tun_not_capable(tun)) |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 2639 | return -EPERM; |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 2640 | err = security_tun_dev_open(tun->security); |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 2641 | if (err < 0) |
| 2642 | return err; |
| 2643 | |
Petar Penkov | 9431709 | 2017-09-22 13:49:14 -0700 | [diff] [blame] | 2644 | err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER, |
Eric Dumazet | af3fb24 | 2018-09-28 14:51:49 -0700 | [diff] [blame] | 2645 | ifr->ifr_flags & IFF_NAPI, |
Yang Yingliang | 77f22f9 | 2019-09-10 18:56:57 +0800 | [diff] [blame] | 2646 | ifr->ifr_flags & IFF_NAPI_FRAGS, true); |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 2647 | if (err < 0) |
| 2648 | return err; |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 2649 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 2650 | if (tun->flags & IFF_MULTI_QUEUE && |
Jason Wang | e8dbad6 | 2013-04-22 20:40:39 +0000 | [diff] [blame] | 2651 | (tun->numqueues + tun->numdisabled > 1)) { |
| 2652 | /* One or more queue has already been attached, no need |
| 2653 | * to initialize the device again. |
| 2654 | */ |
Sabrina Dubroca | 83c1f36 | 2018-04-10 16:28:56 +0200 | [diff] [blame] | 2655 | netdev_state_change(dev); |
Jason Wang | e8dbad6 | 2013-04-22 20:40:39 +0000 | [diff] [blame] | 2656 | return 0; |
| 2657 | } |
Sabrina Dubroca | 9fffc5c | 2018-04-10 16:28:55 +0200 | [diff] [blame] | 2658 | |
| 2659 | tun->flags = (tun->flags & ~TUN_FEATURES) | |
| 2660 | (ifr->ifr_flags & TUN_FEATURES); |
Sabrina Dubroca | 83c1f36 | 2018-04-10 16:28:56 +0200 | [diff] [blame] | 2661 | |
| 2662 | netdev_state_change(dev); |
| 2663 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2664 | char *name; |
| 2665 | unsigned long flags = 0; |
Jason Wang | edfb6a1 | 2013-01-23 03:59:12 +0000 | [diff] [blame] | 2666 | int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ? |
| 2667 | MAX_TAP_QUEUES : 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2668 | |
Eric W. Biederman | c260b77 | 2012-11-18 21:34:11 +0000 | [diff] [blame] | 2669 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
David Woodhouse | ca6bb5d | 2006-06-22 16:07:52 -0700 | [diff] [blame] | 2670 | return -EPERM; |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 2671 | err = security_tun_dev_create(); |
| 2672 | if (err < 0) |
| 2673 | return err; |
David Woodhouse | ca6bb5d | 2006-06-22 16:07:52 -0700 | [diff] [blame] | 2674 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2675 | /* Set dev type */ |
| 2676 | if (ifr->ifr_flags & IFF_TUN) { |
| 2677 | /* TUN device */ |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 2678 | flags |= IFF_TUN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2679 | name = "tun%d"; |
| 2680 | } else if (ifr->ifr_flags & IFF_TAP) { |
| 2681 | /* TAP device */ |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 2682 | flags |= IFF_TAP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2683 | name = "tap%d"; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 2684 | } else |
Kusanagi Kouichi | 36989b9 | 2009-09-16 21:36:13 +0000 | [diff] [blame] | 2685 | return -EINVAL; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 2686 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2687 | if (*ifr->ifr_name) |
| 2688 | name = ifr->ifr_name; |
| 2689 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 2690 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
Tom Gundersen | c835a67 | 2014-07-14 16:37:24 +0200 | [diff] [blame] | 2691 | NET_NAME_UNKNOWN, tun_setup, queues, |
| 2692 | queues); |
Jason Wang | edfb6a1 | 2013-01-23 03:59:12 +0000 | [diff] [blame] | 2693 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2694 | if (!dev) |
| 2695 | return -ENOMEM; |
| 2696 | |
Pavel Emelyanov | fc54c65 | 2008-04-16 00:41:53 -0700 | [diff] [blame] | 2697 | dev_net_set(dev, net); |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 2698 | dev->rtnl_link_ops = &tun_link_ops; |
Pavel Emelyanov | fb7589a | 2013-08-21 14:31:38 +0400 | [diff] [blame] | 2699 | dev->ifindex = tfile->ifindex; |
Takashi Iwai | c4d33e2 | 2015-02-04 14:37:34 +0100 | [diff] [blame] | 2700 | dev->sysfs_groups[0] = &tun_attr_group; |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 2701 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2702 | tun = netdev_priv(dev); |
| 2703 | tun->dev = dev; |
| 2704 | tun->flags = flags; |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 2705 | tun->txflt.count = 0; |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 2706 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2707 | |
Paolo Abeni | eaea34b | 2016-02-26 10:45:40 +0100 | [diff] [blame] | 2708 | tun->align = NET_SKB_PAD; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2709 | tun->filter_attached = false; |
| 2710 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; |
Jason Wang | 5503fce | 2017-01-18 15:02:03 +0800 | [diff] [blame] | 2711 | tun->rx_batched = 0; |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 2712 | RCU_INIT_POINTER(tun->steering_prog, NULL); |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 2713 | |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 2714 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
| 2715 | if (!dev->tstats) { |
Paolo Abeni | 608b997 | 2016-04-13 10:52:20 +0200 | [diff] [blame] | 2716 | err = -ENOMEM; |
| 2717 | goto err_free_dev; |
| 2718 | } |
| 2719 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 2720 | spin_lock_init(&tun->lock); |
| 2721 | |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 2722 | err = security_tun_dev_alloc_security(&tun->security); |
| 2723 | if (err < 0) |
Paolo Abeni | 608b997 | 2016-04-13 10:52:20 +0200 | [diff] [blame] | 2724 | goto err_free_stat; |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 2725 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2726 | tun_net_init(dev); |
Pavel Emelyanov | 944a137 | 2013-06-11 17:01:08 +0400 | [diff] [blame] | 2727 | tun_flow_init(tun); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 2728 | |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 2729 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
Jason Wang | 6680ec6 | 2013-07-25 13:00:33 +0800 | [diff] [blame] | 2730 | TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | |
| 2731 | NETIF_F_HW_VLAN_STAG_TX; |
Paolo Abeni | 2a2bbf1 | 2016-04-14 18:39:39 +0200 | [diff] [blame] | 2732 | dev->features = dev->hw_features | NETIF_F_LLTX; |
Fernando Luis Vazquez Cao | 6671b22 | 2014-02-18 21:20:09 +0900 | [diff] [blame] | 2733 | dev->vlan_features = dev->features & |
| 2734 | ~(NETIF_F_HW_VLAN_CTAG_TX | |
| 2735 | NETIF_F_HW_VLAN_STAG_TX); |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 2736 | |
Sabrina Dubroca | 9fffc5c | 2018-04-10 16:28:55 +0200 | [diff] [blame] | 2737 | tun->flags = (tun->flags & ~TUN_FEATURES) | |
| 2738 | (ifr->ifr_flags & TUN_FEATURES); |
| 2739 | |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 2740 | INIT_LIST_HEAD(&tun->disabled); |
Eric Dumazet | af3fb24 | 2018-09-28 14:51:49 -0700 | [diff] [blame] | 2741 | err = tun_attach(tun, file, false, ifr->ifr_flags & IFF_NAPI, |
Yang Yingliang | 77f22f9 | 2019-09-10 18:56:57 +0800 | [diff] [blame] | 2742 | ifr->ifr_flags & IFF_NAPI_FRAGS, false); |
Jason Wang | eb0fb36 | 2012-12-02 17:19:45 +0000 | [diff] [blame] | 2743 | if (err < 0) |
Jason Wang | 662ca43 | 2013-09-11 18:09:48 +0800 | [diff] [blame] | 2744 | goto err_free_flow; |
Jason Wang | eb0fb36 | 2012-12-02 17:19:45 +0000 | [diff] [blame] | 2745 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2746 | err = register_netdevice(tun->dev); |
| 2747 | if (err < 0) |
Jason Wang | 662ca43 | 2013-09-11 18:09:48 +0800 | [diff] [blame] | 2748 | goto err_detach; |
Menglong Dong | c2e315b | 2021-01-18 03:15:39 -0800 | [diff] [blame] | 2749 | /* free_netdev() won't check refcnt, to avoid race |
Yang Yingliang | 77f22f9 | 2019-09-10 18:56:57 +0800 | [diff] [blame] | 2750 | * with dev_put() we need publish tun after registration. |
| 2751 | */ |
| 2752 | rcu_assign_pointer(tfile->tun, tun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2753 | } |
| 2754 | |
Michael S. Tsirkin | af668b3 | 2013-01-28 00:38:02 +0000 | [diff] [blame] | 2755 | netif_carrier_on(tun->dev); |
| 2756 | |
Max Krasnyansky | e35259a | 2008-07-10 16:59:11 -0700 | [diff] [blame] | 2757 | /* Make sure persistent devices do not get stuck in |
| 2758 | * xoff state. |
| 2759 | */ |
| 2760 | if (netif_running(tun->dev)) |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 2761 | netif_tx_wake_all_queues(tun->dev); |
Max Krasnyansky | e35259a | 2008-07-10 16:59:11 -0700 | [diff] [blame] | 2762 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2763 | strcpy(ifr->ifr_name, tun->dev->name); |
| 2764 | return 0; |
| 2765 | |
Jason Wang | 662ca43 | 2013-09-11 18:09:48 +0800 | [diff] [blame] | 2766 | err_detach: |
| 2767 | tun_detach_all(dev); |
Eric Dumazet | 11fc7d5 | 2019-10-07 12:21:05 -0700 | [diff] [blame] | 2768 | /* We are here because register_netdevice() has failed. |
| 2769 | * If register_netdevice() already called tun_free_netdev() |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 2770 | * while dealing with the error, dev->stats has been cleared. |
Eric Dumazet | 11fc7d5 | 2019-10-07 12:21:05 -0700 | [diff] [blame] | 2771 | */ |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 2772 | if (!dev->tstats) |
Eric Dumazet | 11fc7d5 | 2019-10-07 12:21:05 -0700 | [diff] [blame] | 2773 | goto err_free_dev; |
Eric Dumazet | ff244c6 | 2017-08-18 13:39:56 -0700 | [diff] [blame] | 2774 | |
Jason Wang | 662ca43 | 2013-09-11 18:09:48 +0800 | [diff] [blame] | 2775 | err_free_flow: |
| 2776 | tun_flow_uninit(tun); |
| 2777 | security_tun_dev_free_security(tun->security); |
Paolo Abeni | 608b997 | 2016-04-13 10:52:20 +0200 | [diff] [blame] | 2778 | err_free_stat: |
Heiner Kallweit | 497a575 | 2020-11-07 21:50:56 +0100 | [diff] [blame] | 2779 | free_percpu(dev->tstats); |
Jason Wang | 662ca43 | 2013-09-11 18:09:48 +0800 | [diff] [blame] | 2780 | err_free_dev: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2781 | free_netdev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2782 | return err; |
| 2783 | } |
| 2784 | |
Kirill Tkhai | 1213276 | 2019-03-20 12:16:53 +0300 | [diff] [blame] | 2785 | static void tun_get_iff(struct tun_struct *tun, struct ifreq *ifr) |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 2786 | { |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 2787 | strcpy(ifr->ifr_name, tun->dev->name); |
| 2788 | |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 2789 | ifr->ifr_flags = tun_flags(tun); |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 2790 | |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 2791 | } |
| 2792 | |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 2793 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
| 2794 | * privs required. */ |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 2795 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 2796 | { |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 2797 | netdev_features_t features = 0; |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 2798 | |
| 2799 | if (arg & TUN_F_CSUM) { |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 2800 | features |= NETIF_F_HW_CSUM; |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 2801 | arg &= ~TUN_F_CSUM; |
| 2802 | |
| 2803 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { |
| 2804 | if (arg & TUN_F_TSO_ECN) { |
| 2805 | features |= NETIF_F_TSO_ECN; |
| 2806 | arg &= ~TUN_F_TSO_ECN; |
| 2807 | } |
| 2808 | if (arg & TUN_F_TSO4) |
| 2809 | features |= NETIF_F_TSO; |
| 2810 | if (arg & TUN_F_TSO6) |
| 2811 | features |= NETIF_F_TSO6; |
| 2812 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); |
| 2813 | } |
Willem de Bruijn | 0c19f846 | 2017-11-21 10:22:25 -0500 | [diff] [blame] | 2814 | |
| 2815 | arg &= ~TUN_F_UFO; |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 2816 | } |
| 2817 | |
| 2818 | /* This gives the user a way to test for new features in future by |
| 2819 | * trying to set them. */ |
| 2820 | if (arg) |
| 2821 | return -EINVAL; |
| 2822 | |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 2823 | tun->set_features = features; |
Yaroslav Isakov | 0905095 | 2017-03-16 22:44:10 +0300 | [diff] [blame] | 2824 | tun->dev->wanted_features &= ~TUN_USER_FEATURES; |
| 2825 | tun->dev->wanted_features |= features; |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 2826 | netdev_update_features(tun->dev); |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 2827 | |
| 2828 | return 0; |
| 2829 | } |
| 2830 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 2831 | static void tun_detach_filter(struct tun_struct *tun, int n) |
| 2832 | { |
| 2833 | int i; |
| 2834 | struct tun_file *tfile; |
| 2835 | |
| 2836 | for (i = 0; i < n; i++) { |
Jason Wang | b8deabd | 2013-01-11 16:59:32 +0000 | [diff] [blame] | 2837 | tfile = rtnl_dereference(tun->tfiles[i]); |
Hannes Frederic Sowa | 8ced425 | 2016-04-05 17:10:16 +0200 | [diff] [blame] | 2838 | lock_sock(tfile->socket.sk); |
| 2839 | sk_detach_filter(tfile->socket.sk); |
| 2840 | release_sock(tfile->socket.sk); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 2841 | } |
| 2842 | |
| 2843 | tun->filter_attached = false; |
| 2844 | } |
| 2845 | |
| 2846 | static int tun_attach_filter(struct tun_struct *tun) |
| 2847 | { |
| 2848 | int i, ret = 0; |
| 2849 | struct tun_file *tfile; |
| 2850 | |
| 2851 | for (i = 0; i < tun->numqueues; i++) { |
Jason Wang | b8deabd | 2013-01-11 16:59:32 +0000 | [diff] [blame] | 2852 | tfile = rtnl_dereference(tun->tfiles[i]); |
Hannes Frederic Sowa | 8ced425 | 2016-04-05 17:10:16 +0200 | [diff] [blame] | 2853 | lock_sock(tfile->socket.sk); |
| 2854 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
| 2855 | release_sock(tfile->socket.sk); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 2856 | if (ret) { |
| 2857 | tun_detach_filter(tun, i); |
| 2858 | return ret; |
| 2859 | } |
| 2860 | } |
| 2861 | |
| 2862 | tun->filter_attached = true; |
| 2863 | return ret; |
| 2864 | } |
| 2865 | |
| 2866 | static void tun_set_sndbuf(struct tun_struct *tun) |
| 2867 | { |
| 2868 | struct tun_file *tfile; |
| 2869 | int i; |
| 2870 | |
| 2871 | for (i = 0; i < tun->numqueues; i++) { |
Jason Wang | b8deabd | 2013-01-11 16:59:32 +0000 | [diff] [blame] | 2872 | tfile = rtnl_dereference(tun->tfiles[i]); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 2873 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
| 2874 | } |
| 2875 | } |
| 2876 | |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 2877 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
| 2878 | { |
| 2879 | struct tun_file *tfile = file->private_data; |
| 2880 | struct tun_struct *tun; |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 2881 | int ret = 0; |
| 2882 | |
| 2883 | rtnl_lock(); |
| 2884 | |
| 2885 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 2886 | tun = tfile->detached; |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 2887 | if (!tun) { |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 2888 | ret = -EINVAL; |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 2889 | goto unlock; |
| 2890 | } |
| 2891 | ret = security_tun_dev_attach_queue(tun->security); |
| 2892 | if (ret < 0) |
| 2893 | goto unlock; |
Eric Dumazet | af3fb24 | 2018-09-28 14:51:49 -0700 | [diff] [blame] | 2894 | ret = tun_attach(tun, file, false, tun->flags & IFF_NAPI, |
Yang Yingliang | 77f22f9 | 2019-09-10 18:56:57 +0800 | [diff] [blame] | 2895 | tun->flags & IFF_NAPI_FRAGS, true); |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 2896 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
Jason Wang | b8deabd | 2013-01-11 16:59:32 +0000 | [diff] [blame] | 2897 | tun = rtnl_dereference(tfile->tun); |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 2898 | if (!tun || !(tun->flags & IFF_MULTI_QUEUE) || tfile->detached) |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 2899 | ret = -EINVAL; |
| 2900 | else |
| 2901 | __tun_detach(tfile, false); |
| 2902 | } else |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 2903 | ret = -EINVAL; |
| 2904 | |
Sabrina Dubroca | 83c1f36 | 2018-04-10 16:28:56 +0200 | [diff] [blame] | 2905 | if (ret >= 0) |
| 2906 | netdev_state_change(tun->dev); |
| 2907 | |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 2908 | unlock: |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 2909 | rtnl_unlock(); |
| 2910 | return ret; |
| 2911 | } |
| 2912 | |
Jason Wang | 8f3f330 | 2020-07-31 00:17:20 -0400 | [diff] [blame] | 2913 | static int tun_set_ebpf(struct tun_struct *tun, struct tun_prog __rcu **prog_p, |
Jason Wang | cd5681d | 2018-01-16 16:31:01 +0800 | [diff] [blame] | 2914 | void __user *data) |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 2915 | { |
| 2916 | struct bpf_prog *prog; |
| 2917 | int fd; |
| 2918 | |
| 2919 | if (copy_from_user(&fd, data, sizeof(fd))) |
| 2920 | return -EFAULT; |
| 2921 | |
| 2922 | if (fd == -1) { |
| 2923 | prog = NULL; |
| 2924 | } else { |
| 2925 | prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER); |
| 2926 | if (IS_ERR(prog)) |
| 2927 | return PTR_ERR(prog); |
| 2928 | } |
| 2929 | |
Jason Wang | cd5681d | 2018-01-16 16:31:01 +0800 | [diff] [blame] | 2930 | return __tun_set_ebpf(tun, prog_p, prog); |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 2931 | } |
| 2932 | |
Phillip Potter | cca8ea3 | 2021-04-06 18:45:54 +0100 | [diff] [blame] | 2933 | /* Return correct value for tun->dev->addr_len based on tun->dev->type. */ |
| 2934 | static unsigned char tun_get_addr_len(unsigned short type) |
| 2935 | { |
| 2936 | switch (type) { |
| 2937 | case ARPHRD_IP6GRE: |
| 2938 | case ARPHRD_TUNNEL6: |
| 2939 | return sizeof(struct in6_addr); |
| 2940 | case ARPHRD_IPGRE: |
| 2941 | case ARPHRD_TUNNEL: |
| 2942 | case ARPHRD_SIT: |
| 2943 | return 4; |
| 2944 | case ARPHRD_ETHER: |
| 2945 | return ETH_ALEN; |
| 2946 | case ARPHRD_IEEE802154: |
| 2947 | case ARPHRD_IEEE802154_MONITOR: |
| 2948 | return IEEE802154_EXTENDED_ADDR_LEN; |
| 2949 | case ARPHRD_PHONET_PIPE: |
| 2950 | case ARPHRD_PPP: |
| 2951 | case ARPHRD_NONE: |
| 2952 | return 0; |
| 2953 | case ARPHRD_6LOWPAN: |
| 2954 | return EUI64_ADDR_LEN; |
| 2955 | case ARPHRD_FDDI: |
| 2956 | return FDDI_K_ALEN; |
| 2957 | case ARPHRD_HIPPI: |
| 2958 | return HIPPI_ALEN; |
| 2959 | case ARPHRD_IEEE802: |
| 2960 | return FC_ALEN; |
| 2961 | case ARPHRD_ROSE: |
| 2962 | return ROSE_ADDR_LEN; |
| 2963 | case ARPHRD_NETROM: |
| 2964 | return AX25_ADDR_LEN; |
| 2965 | case ARPHRD_LOCALTLK: |
| 2966 | return LTALK_ALEN; |
| 2967 | default: |
| 2968 | return 0; |
| 2969 | } |
| 2970 | } |
| 2971 | |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 2972 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
| 2973 | unsigned long arg, int ifreq_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2974 | { |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 2975 | struct tun_file *tfile = file->private_data; |
Kirill Tkhai | f663706 | 2018-05-08 19:21:34 +0300 | [diff] [blame] | 2976 | struct net *net = sock_net(&tfile->sk); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 2977 | struct tun_struct *tun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2978 | void __user* argp = (void __user*)arg; |
Nicolas Dichtel | 26d3192 | 2018-11-28 19:12:56 +0100 | [diff] [blame] | 2979 | unsigned int ifindex, carrier; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2980 | struct ifreq ifr; |
Eric W. Biederman | 0625c88 | 2012-02-07 16:48:55 -0800 | [diff] [blame] | 2981 | kuid_t owner; |
| 2982 | kgid_t group; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 2983 | int sndbuf; |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 2984 | int vnet_hdr_sz; |
Michael S. Tsirkin | 1cf8e41 | 2014-12-16 15:05:06 +0200 | [diff] [blame] | 2985 | int le; |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 2986 | int ret; |
Sabrina Dubroca | 83c1f36 | 2018-04-10 16:28:56 +0200 | [diff] [blame] | 2987 | bool do_notify = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2988 | |
Kirill Tkhai | f2780d6 | 2018-02-14 16:40:14 +0300 | [diff] [blame] | 2989 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || |
| 2990 | (_IOC_TYPE(cmd) == SOCK_IOC_TYPE && cmd != SIOCGSKNS)) { |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 2991 | if (copy_from_user(&ifr, argp, ifreq_len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2992 | return -EFAULT; |
David S. Miller | 8bbb181 | 2012-07-30 14:52:48 -0700 | [diff] [blame] | 2993 | } else { |
Mathias Krause | a117dac | 2012-07-29 19:45:14 +0000 | [diff] [blame] | 2994 | memset(&ifr, 0, sizeof(ifr)); |
David S. Miller | 8bbb181 | 2012-07-30 14:52:48 -0700 | [diff] [blame] | 2995 | } |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 2996 | if (cmd == TUNGETFEATURES) { |
| 2997 | /* Currently this just means: "what IFF flags are valid?". |
| 2998 | * This is needed because we never checked for invalid flags on |
Michael S. Tsirkin | 031f5e03 | 2014-11-19 14:44:40 +0200 | [diff] [blame] | 2999 | * TUNSETIFF. |
| 3000 | */ |
| 3001 | return put_user(IFF_TUN | IFF_TAP | TUN_FEATURES, |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 3002 | (unsigned int __user*)argp); |
Kirill Tkhai | f663706 | 2018-05-08 19:21:34 +0300 | [diff] [blame] | 3003 | } else if (cmd == TUNSETQUEUE) { |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 3004 | return tun_set_queue(file, &ifr); |
Kirill Tkhai | f663706 | 2018-05-08 19:21:34 +0300 | [diff] [blame] | 3005 | } else if (cmd == SIOCGSKNS) { |
| 3006 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| 3007 | return -EPERM; |
| 3008 | return open_related_ns(&net->ns, get_net_ns); |
| 3009 | } |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 3010 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 3011 | rtnl_lock(); |
| 3012 | |
yuan linyu | 9484dc7 | 2017-09-23 22:36:52 +0800 | [diff] [blame] | 3013 | tun = tun_get(tfile); |
Gao Feng | 0f16bc1 | 2016-10-25 22:26:09 +0800 | [diff] [blame] | 3014 | if (cmd == TUNSETIFF) { |
| 3015 | ret = -EEXIST; |
| 3016 | if (tun) |
| 3017 | goto unlock; |
| 3018 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3019 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
| 3020 | |
Kirill Tkhai | f2780d6 | 2018-02-14 16:40:14 +0300 | [diff] [blame] | 3021 | ret = tun_set_iff(net, file, &ifr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3022 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 3023 | if (ret) |
| 3024 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3025 | |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 3026 | if (copy_to_user(argp, &ifr, ifreq_len)) |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 3027 | ret = -EFAULT; |
| 3028 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3029 | } |
Pavel Emelyanov | fb7589a | 2013-08-21 14:31:38 +0400 | [diff] [blame] | 3030 | if (cmd == TUNSETIFINDEX) { |
| 3031 | ret = -EPERM; |
| 3032 | if (tun) |
| 3033 | goto unlock; |
| 3034 | |
| 3035 | ret = -EFAULT; |
| 3036 | if (copy_from_user(&ifindex, argp, sizeof(ifindex))) |
| 3037 | goto unlock; |
| 3038 | |
| 3039 | ret = 0; |
| 3040 | tfile->ifindex = ifindex; |
| 3041 | goto unlock; |
| 3042 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3043 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 3044 | ret = -EBADFD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3045 | if (!tun) |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 3046 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3047 | |
Michal Kubecek | 3424170 | 2020-03-04 17:24:14 +0100 | [diff] [blame] | 3048 | netif_info(tun, drv, tun->dev, "tun_chr_ioctl cmd %u\n", cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3049 | |
Kirill Tkhai | 0c3e0e3 | 2019-03-20 12:16:42 +0300 | [diff] [blame] | 3050 | net = dev_net(tun->dev); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 3051 | ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3052 | switch (cmd) { |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 3053 | case TUNGETIFF: |
Kirill Tkhai | 1213276 | 2019-03-20 12:16:53 +0300 | [diff] [blame] | 3054 | tun_get_iff(tun, &ifr); |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 3055 | |
Pavel Emelyanov | 3d407a8 | 2013-08-21 14:32:00 +0400 | [diff] [blame] | 3056 | if (tfile->detached) |
| 3057 | ifr.ifr_flags |= IFF_DETACH_QUEUE; |
Pavel Emelyanov | 849c9b6 | 2013-08-21 14:32:21 +0400 | [diff] [blame] | 3058 | if (!tfile->socket.sk->sk_filter) |
| 3059 | ifr.ifr_flags |= IFF_NOFILTER; |
Pavel Emelyanov | 3d407a8 | 2013-08-21 14:32:00 +0400 | [diff] [blame] | 3060 | |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 3061 | if (copy_to_user(argp, &ifr, ifreq_len)) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 3062 | ret = -EFAULT; |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 3063 | break; |
| 3064 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3065 | case TUNSETNOCSUM: |
| 3066 | /* Disable/Enable checksum */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3067 | |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 3068 | /* [unimplemented] */ |
Michal Kubecek | 3424170 | 2020-03-04 17:24:14 +0100 | [diff] [blame] | 3069 | netif_info(tun, drv, tun->dev, "ignored: set checksum %s\n", |
| 3070 | arg ? "disabled" : "enabled"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3071 | break; |
| 3072 | |
| 3073 | case TUNSETPERSIST: |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 3074 | /* Disable/Enable persist mode. Keep an extra reference to the |
| 3075 | * module to prevent the module being unprobed. |
| 3076 | */ |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 3077 | if (arg && !(tun->flags & IFF_PERSIST)) { |
| 3078 | tun->flags |= IFF_PERSIST; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 3079 | __module_get(THIS_MODULE); |
Sabrina Dubroca | 83c1f36 | 2018-04-10 16:28:56 +0200 | [diff] [blame] | 3080 | do_notify = true; |
Jason Wang | dd38bd8 | 2013-01-11 16:59:34 +0000 | [diff] [blame] | 3081 | } |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 3082 | if (!arg && (tun->flags & IFF_PERSIST)) { |
| 3083 | tun->flags &= ~IFF_PERSIST; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 3084 | module_put(THIS_MODULE); |
Sabrina Dubroca | 83c1f36 | 2018-04-10 16:28:56 +0200 | [diff] [blame] | 3085 | do_notify = true; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 3086 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3087 | |
Michal Kubecek | 3424170 | 2020-03-04 17:24:14 +0100 | [diff] [blame] | 3088 | netif_info(tun, drv, tun->dev, "persist %s\n", |
| 3089 | arg ? "enabled" : "disabled"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3090 | break; |
| 3091 | |
| 3092 | case TUNSETOWNER: |
| 3093 | /* Set owner of the device */ |
Eric W. Biederman | 0625c88 | 2012-02-07 16:48:55 -0800 | [diff] [blame] | 3094 | owner = make_kuid(current_user_ns(), arg); |
| 3095 | if (!uid_valid(owner)) { |
| 3096 | ret = -EINVAL; |
| 3097 | break; |
| 3098 | } |
| 3099 | tun->owner = owner; |
Sabrina Dubroca | 83c1f36 | 2018-04-10 16:28:56 +0200 | [diff] [blame] | 3100 | do_notify = true; |
Michal Kubecek | 3424170 | 2020-03-04 17:24:14 +0100 | [diff] [blame] | 3101 | netif_info(tun, drv, tun->dev, "owner set to %u\n", |
| 3102 | from_kuid(&init_user_ns, tun->owner)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3103 | break; |
| 3104 | |
Guido Guenther | 8c64462 | 2007-07-02 22:50:25 -0700 | [diff] [blame] | 3105 | case TUNSETGROUP: |
| 3106 | /* Set group of the device */ |
Eric W. Biederman | 0625c88 | 2012-02-07 16:48:55 -0800 | [diff] [blame] | 3107 | group = make_kgid(current_user_ns(), arg); |
| 3108 | if (!gid_valid(group)) { |
| 3109 | ret = -EINVAL; |
| 3110 | break; |
| 3111 | } |
| 3112 | tun->group = group; |
Sabrina Dubroca | 83c1f36 | 2018-04-10 16:28:56 +0200 | [diff] [blame] | 3113 | do_notify = true; |
Michal Kubecek | 3424170 | 2020-03-04 17:24:14 +0100 | [diff] [blame] | 3114 | netif_info(tun, drv, tun->dev, "group set to %u\n", |
| 3115 | from_kgid(&init_user_ns, tun->group)); |
Guido Guenther | 8c64462 | 2007-07-02 22:50:25 -0700 | [diff] [blame] | 3116 | break; |
| 3117 | |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 3118 | case TUNSETLINK: |
| 3119 | /* Only allow setting the type when the interface is down */ |
| 3120 | if (tun->dev->flags & IFF_UP) { |
Michal Kubecek | 3424170 | 2020-03-04 17:24:14 +0100 | [diff] [blame] | 3121 | netif_info(tun, drv, tun->dev, |
| 3122 | "Linktype set failed because interface is up\n"); |
David S. Miller | 48abfe0 | 2008-04-23 19:37:58 -0700 | [diff] [blame] | 3123 | ret = -EBUSY; |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 3124 | } else { |
Martin Schiller | 8e1e33f | 2020-11-18 07:39:19 +0100 | [diff] [blame] | 3125 | ret = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, |
| 3126 | tun->dev); |
| 3127 | ret = notifier_to_errno(ret); |
| 3128 | if (ret) { |
| 3129 | netif_info(tun, drv, tun->dev, |
| 3130 | "Refused to change device type\n"); |
| 3131 | break; |
| 3132 | } |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 3133 | tun->dev->type = (int) arg; |
Phillip Potter | cca8ea3 | 2021-04-06 18:45:54 +0100 | [diff] [blame] | 3134 | tun->dev->addr_len = tun_get_addr_len(tun->dev->type); |
Michal Kubecek | 3424170 | 2020-03-04 17:24:14 +0100 | [diff] [blame] | 3135 | netif_info(tun, drv, tun->dev, "linktype set to %d\n", |
| 3136 | tun->dev->type); |
Martin Schiller | 8e1e33f | 2020-11-18 07:39:19 +0100 | [diff] [blame] | 3137 | call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, |
| 3138 | tun->dev); |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 3139 | } |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 3140 | break; |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 3141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3142 | case TUNSETDEBUG: |
Michal Kubecek | 3424170 | 2020-03-04 17:24:14 +0100 | [diff] [blame] | 3143 | tun->msg_enable = (u32)arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3144 | break; |
Michal Kubecek | 3424170 | 2020-03-04 17:24:14 +0100 | [diff] [blame] | 3145 | |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 3146 | case TUNSETOFFLOAD: |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 3147 | ret = set_offload(tun, arg); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 3148 | break; |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 3149 | |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 3150 | case TUNSETTXFILTER: |
| 3151 | /* Can be set only for TAPs */ |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 3152 | ret = -EINVAL; |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 3153 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 3154 | break; |
Harvey Harrison | c0e5a8c | 2008-07-16 12:45:34 -0700 | [diff] [blame] | 3155 | ret = update_filter(&tun->txflt, (void __user *)arg); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 3156 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3157 | |
| 3158 | case SIOCGIFHWADDR: |
Uwe Kleine-König | b595076 | 2010-11-01 15:38:34 -0400 | [diff] [blame] | 3159 | /* Get hw address */ |
Cong Wang | 3b23a32 | 2021-02-11 11:34:10 -0800 | [diff] [blame] | 3160 | dev_get_mac_address(&ifr.ifr_hwaddr, net, tun->dev->name); |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 3161 | if (copy_to_user(argp, &ifr, ifreq_len)) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 3162 | ret = -EFAULT; |
| 3163 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3164 | |
| 3165 | case SIOCSIFHWADDR: |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 3166 | /* Set hw address */ |
Cong Wang | 3b23a32 | 2021-02-11 11:34:10 -0800 | [diff] [blame] | 3167 | ret = dev_set_mac_address_user(tun->dev, &ifr.ifr_hwaddr, NULL); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 3168 | break; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 3169 | |
| 3170 | case TUNGETSNDBUF: |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 3171 | sndbuf = tfile->socket.sk->sk_sndbuf; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 3172 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
| 3173 | ret = -EFAULT; |
| 3174 | break; |
| 3175 | |
| 3176 | case TUNSETSNDBUF: |
| 3177 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { |
| 3178 | ret = -EFAULT; |
| 3179 | break; |
| 3180 | } |
Craig Gallek | 93161922 | 2017-10-30 18:50:11 -0400 | [diff] [blame] | 3181 | if (sndbuf <= 0) { |
| 3182 | ret = -EINVAL; |
| 3183 | break; |
| 3184 | } |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 3185 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 3186 | tun->sndbuf = sndbuf; |
| 3187 | tun_set_sndbuf(tun); |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 3188 | break; |
| 3189 | |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 3190 | case TUNGETVNETHDRSZ: |
| 3191 | vnet_hdr_sz = tun->vnet_hdr_sz; |
| 3192 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) |
| 3193 | ret = -EFAULT; |
| 3194 | break; |
| 3195 | |
| 3196 | case TUNSETVNETHDRSZ: |
| 3197 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { |
| 3198 | ret = -EFAULT; |
| 3199 | break; |
| 3200 | } |
| 3201 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { |
| 3202 | ret = -EINVAL; |
| 3203 | break; |
| 3204 | } |
| 3205 | |
| 3206 | tun->vnet_hdr_sz = vnet_hdr_sz; |
| 3207 | break; |
| 3208 | |
Michael S. Tsirkin | 1cf8e41 | 2014-12-16 15:05:06 +0200 | [diff] [blame] | 3209 | case TUNGETVNETLE: |
| 3210 | le = !!(tun->flags & TUN_VNET_LE); |
| 3211 | if (put_user(le, (int __user *)argp)) |
| 3212 | ret = -EFAULT; |
| 3213 | break; |
| 3214 | |
| 3215 | case TUNSETVNETLE: |
| 3216 | if (get_user(le, (int __user *)argp)) { |
| 3217 | ret = -EFAULT; |
| 3218 | break; |
| 3219 | } |
| 3220 | if (le) |
| 3221 | tun->flags |= TUN_VNET_LE; |
| 3222 | else |
| 3223 | tun->flags &= ~TUN_VNET_LE; |
| 3224 | break; |
| 3225 | |
Greg Kurz | 8b8e658 | 2015-04-24 14:50:36 +0200 | [diff] [blame] | 3226 | case TUNGETVNETBE: |
| 3227 | ret = tun_get_vnet_be(tun, argp); |
| 3228 | break; |
| 3229 | |
| 3230 | case TUNSETVNETBE: |
| 3231 | ret = tun_set_vnet_be(tun, argp); |
| 3232 | break; |
| 3233 | |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 3234 | case TUNATTACHFILTER: |
| 3235 | /* Can be set only for TAPs */ |
| 3236 | ret = -EINVAL; |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 3237 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 3238 | break; |
| 3239 | ret = -EFAULT; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 3240 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 3241 | break; |
| 3242 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 3243 | ret = tun_attach_filter(tun); |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 3244 | break; |
| 3245 | |
| 3246 | case TUNDETACHFILTER: |
| 3247 | /* Can be set only for TAPs */ |
| 3248 | ret = -EINVAL; |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 3249 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 3250 | break; |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 3251 | ret = 0; |
| 3252 | tun_detach_filter(tun, tun->numqueues); |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 3253 | break; |
| 3254 | |
Pavel Emelyanov | 76975e9 | 2013-08-21 14:32:39 +0400 | [diff] [blame] | 3255 | case TUNGETFILTER: |
| 3256 | ret = -EINVAL; |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 3257 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
Pavel Emelyanov | 76975e9 | 2013-08-21 14:32:39 +0400 | [diff] [blame] | 3258 | break; |
| 3259 | ret = -EFAULT; |
| 3260 | if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog))) |
| 3261 | break; |
| 3262 | ret = 0; |
| 3263 | break; |
| 3264 | |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 3265 | case TUNSETSTEERINGEBPF: |
Jason Wang | cd5681d | 2018-01-16 16:31:01 +0800 | [diff] [blame] | 3266 | ret = tun_set_ebpf(tun, &tun->steering_prog, argp); |
Jason Wang | 96f8406 | 2017-12-04 17:31:23 +0800 | [diff] [blame] | 3267 | break; |
| 3268 | |
Jason Wang | aff3d70 | 2018-01-16 16:31:02 +0800 | [diff] [blame] | 3269 | case TUNSETFILTEREBPF: |
| 3270 | ret = tun_set_ebpf(tun, &tun->filter_prog, argp); |
| 3271 | break; |
| 3272 | |
Nicolas Dichtel | 26d3192 | 2018-11-28 19:12:56 +0100 | [diff] [blame] | 3273 | case TUNSETCARRIER: |
| 3274 | ret = -EFAULT; |
| 3275 | if (copy_from_user(&carrier, argp, sizeof(carrier))) |
| 3276 | goto unlock; |
| 3277 | |
| 3278 | ret = tun_net_change_carrier(tun->dev, (bool)carrier); |
| 3279 | break; |
| 3280 | |
Kirill Tkhai | 0c3e0e3 | 2019-03-20 12:16:42 +0300 | [diff] [blame] | 3281 | case TUNGETDEVNETNS: |
| 3282 | ret = -EPERM; |
| 3283 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| 3284 | goto unlock; |
| 3285 | ret = open_related_ns(&net->ns, get_net_ns); |
| 3286 | break; |
| 3287 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3288 | default: |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 3289 | ret = -EINVAL; |
| 3290 | break; |
Joe Perches | ee289b6 | 2010-05-17 22:47:34 -0700 | [diff] [blame] | 3291 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3292 | |
Sabrina Dubroca | 83c1f36 | 2018-04-10 16:28:56 +0200 | [diff] [blame] | 3293 | if (do_notify) |
| 3294 | netdev_state_change(tun->dev); |
| 3295 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 3296 | unlock: |
| 3297 | rtnl_unlock(); |
| 3298 | if (tun) |
| 3299 | tun_put(tun); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 3300 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3301 | } |
| 3302 | |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 3303 | static long tun_chr_ioctl(struct file *file, |
| 3304 | unsigned int cmd, unsigned long arg) |
| 3305 | { |
| 3306 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); |
| 3307 | } |
| 3308 | |
| 3309 | #ifdef CONFIG_COMPAT |
| 3310 | static long tun_chr_compat_ioctl(struct file *file, |
| 3311 | unsigned int cmd, unsigned long arg) |
| 3312 | { |
| 3313 | switch (cmd) { |
| 3314 | case TUNSETIFF: |
| 3315 | case TUNGETIFF: |
| 3316 | case TUNSETTXFILTER: |
| 3317 | case TUNGETSNDBUF: |
| 3318 | case TUNSETSNDBUF: |
| 3319 | case SIOCGIFHWADDR: |
| 3320 | case SIOCSIFHWADDR: |
| 3321 | arg = (unsigned long)compat_ptr(arg); |
| 3322 | break; |
| 3323 | default: |
| 3324 | arg = (compat_ulong_t)arg; |
| 3325 | break; |
| 3326 | } |
| 3327 | |
| 3328 | /* |
| 3329 | * compat_ifreq is shorter than ifreq, so we must not access beyond |
| 3330 | * the end of that structure. All fields that are used in this |
| 3331 | * driver are compatible though, we don't need to convert the |
| 3332 | * contents. |
| 3333 | */ |
| 3334 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); |
| 3335 | } |
| 3336 | #endif /* CONFIG_COMPAT */ |
| 3337 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3338 | static int tun_chr_fasync(int fd, struct file *file, int on) |
| 3339 | { |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 3340 | struct tun_file *tfile = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3341 | int ret; |
| 3342 | |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 3343 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 3344 | goto out; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 3345 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3346 | if (on) { |
Eric W. Biederman | 0191913 | 2017-07-16 22:05:57 -0500 | [diff] [blame] | 3347 | __f_setown(file, task_pid(current), PIDTYPE_TGID, 0); |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 3348 | tfile->flags |= TUN_FASYNC; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 3349 | } else |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 3350 | tfile->flags &= ~TUN_FASYNC; |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 3351 | ret = 0; |
| 3352 | out: |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 3353 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3354 | } |
| 3355 | |
| 3356 | static int tun_chr_open(struct inode *inode, struct file * file) |
| 3357 | { |
Eric W. Biederman | 140e807da | 2015-05-08 21:07:08 -0500 | [diff] [blame] | 3358 | struct net *net = current->nsproxy->net_ns; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 3359 | struct tun_file *tfile; |
Thomas Gleixner | deed49f | 2009-10-14 01:19:46 -0700 | [diff] [blame] | 3360 | |
Eric W. Biederman | 140e807da | 2015-05-08 21:07:08 -0500 | [diff] [blame] | 3361 | tfile = (struct tun_file *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, |
Eric W. Biederman | 11aa9c2 | 2015-05-08 21:09:13 -0500 | [diff] [blame] | 3362 | &tun_proto, 0); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 3363 | if (!tfile) |
| 3364 | return -ENOMEM; |
Jason Wang | b196d88 | 2018-05-11 10:49:25 +0800 | [diff] [blame] | 3365 | if (ptr_ring_init(&tfile->tx_ring, 0, GFP_KERNEL)) { |
| 3366 | sk_free(&tfile->sk); |
| 3367 | return -ENOMEM; |
| 3368 | } |
| 3369 | |
Eric Dumazet | c7256f5 | 2018-09-28 14:51:48 -0700 | [diff] [blame] | 3370 | mutex_init(&tfile->napi_mutex); |
Monam Agarwal | c956674 | 2014-03-24 00:02:32 +0530 | [diff] [blame] | 3371 | RCU_INIT_POINTER(tfile->tun, NULL); |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 3372 | tfile->flags = 0; |
Pavel Emelyanov | fb7589a | 2013-08-21 14:31:38 +0400 | [diff] [blame] | 3373 | tfile->ifindex = 0; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 3374 | |
Al Viro | 333f790 | 2019-07-05 20:14:16 +0100 | [diff] [blame] | 3375 | init_waitqueue_head(&tfile->socket.wq.wait); |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 3376 | |
| 3377 | tfile->socket.file = file; |
| 3378 | tfile->socket.ops = &tun_socket_ops; |
| 3379 | |
| 3380 | sock_init_data(&tfile->socket, &tfile->sk); |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 3381 | |
| 3382 | tfile->sk.sk_write_space = tun_sock_write_space; |
| 3383 | tfile->sk.sk_sndbuf = INT_MAX; |
| 3384 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 3385 | file->private_data = tfile; |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 3386 | INIT_LIST_HEAD(&tfile->next); |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 3387 | |
Jason Wang | 19a6afb | 2013-06-08 14:17:41 +0800 | [diff] [blame] | 3388 | sock_set_flag(&tfile->sk, SOCK_ZEROCOPY); |
| 3389 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3390 | return 0; |
| 3391 | } |
| 3392 | |
| 3393 | static int tun_chr_close(struct inode *inode, struct file *file) |
| 3394 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 3395 | struct tun_file *tfile = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3396 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 3397 | tun_detach(tfile, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3398 | |
| 3399 | return 0; |
| 3400 | } |
| 3401 | |
Masatake YAMATO | 93e14b6 | 2014-01-29 16:43:31 +0900 | [diff] [blame] | 3402 | #ifdef CONFIG_PROC_FS |
yuan linyu | 9484dc7 | 2017-09-23 22:36:52 +0800 | [diff] [blame] | 3403 | static void tun_chr_show_fdinfo(struct seq_file *m, struct file *file) |
Masatake YAMATO | 93e14b6 | 2014-01-29 16:43:31 +0900 | [diff] [blame] | 3404 | { |
yuan linyu | 9484dc7 | 2017-09-23 22:36:52 +0800 | [diff] [blame] | 3405 | struct tun_file *tfile = file->private_data; |
Masatake YAMATO | 93e14b6 | 2014-01-29 16:43:31 +0900 | [diff] [blame] | 3406 | struct tun_struct *tun; |
| 3407 | struct ifreq ifr; |
| 3408 | |
| 3409 | memset(&ifr, 0, sizeof(ifr)); |
| 3410 | |
| 3411 | rtnl_lock(); |
yuan linyu | 9484dc7 | 2017-09-23 22:36:52 +0800 | [diff] [blame] | 3412 | tun = tun_get(tfile); |
Masatake YAMATO | 93e14b6 | 2014-01-29 16:43:31 +0900 | [diff] [blame] | 3413 | if (tun) |
Kirill Tkhai | 1213276 | 2019-03-20 12:16:53 +0300 | [diff] [blame] | 3414 | tun_get_iff(tun, &ifr); |
Masatake YAMATO | 93e14b6 | 2014-01-29 16:43:31 +0900 | [diff] [blame] | 3415 | rtnl_unlock(); |
| 3416 | |
| 3417 | if (tun) |
| 3418 | tun_put(tun); |
| 3419 | |
Joe Perches | a3816ab | 2014-09-29 16:08:25 -0700 | [diff] [blame] | 3420 | seq_printf(m, "iff:\t%s\n", ifr.ifr_name); |
Masatake YAMATO | 93e14b6 | 2014-01-29 16:43:31 +0900 | [diff] [blame] | 3421 | } |
| 3422 | #endif |
| 3423 | |
Arjan van de Ven | d54b1fd | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 3424 | static const struct file_operations tun_fops = { |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 3425 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3426 | .llseek = no_llseek, |
Al Viro | 9b06703 | 2014-11-07 13:52:07 -0500 | [diff] [blame] | 3427 | .read_iter = tun_chr_read_iter, |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 3428 | .write_iter = tun_chr_write_iter, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3429 | .poll = tun_chr_poll, |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 3430 | .unlocked_ioctl = tun_chr_ioctl, |
| 3431 | #ifdef CONFIG_COMPAT |
| 3432 | .compat_ioctl = tun_chr_compat_ioctl, |
| 3433 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3434 | .open = tun_chr_open, |
| 3435 | .release = tun_chr_close, |
Masatake YAMATO | 93e14b6 | 2014-01-29 16:43:31 +0900 | [diff] [blame] | 3436 | .fasync = tun_chr_fasync, |
| 3437 | #ifdef CONFIG_PROC_FS |
| 3438 | .show_fdinfo = tun_chr_show_fdinfo, |
| 3439 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3440 | }; |
| 3441 | |
| 3442 | static struct miscdevice tun_miscdev = { |
| 3443 | .minor = TUN_MINOR, |
| 3444 | .name = "tun", |
Kay Sievers | e454cea | 2009-09-18 23:01:12 +0200 | [diff] [blame] | 3445 | .nodename = "net/tun", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3446 | .fops = &tun_fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3447 | }; |
| 3448 | |
| 3449 | /* ethtool interface */ |
| 3450 | |
Chas Williams | 4e24f2d | 2018-06-02 17:49:53 -0400 | [diff] [blame] | 3451 | static void tun_default_link_ksettings(struct net_device *dev, |
| 3452 | struct ethtool_link_ksettings *cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3453 | { |
Philippe Reynes | 29ccc49 | 2017-03-11 22:03:50 +0100 | [diff] [blame] | 3454 | ethtool_link_ksettings_zero_link_mode(cmd, supported); |
| 3455 | ethtool_link_ksettings_zero_link_mode(cmd, advertising); |
| 3456 | cmd->base.speed = SPEED_10; |
| 3457 | cmd->base.duplex = DUPLEX_FULL; |
| 3458 | cmd->base.port = PORT_TP; |
| 3459 | cmd->base.phy_address = 0; |
| 3460 | cmd->base.autoneg = AUTONEG_DISABLE; |
Chas Williams | 4e24f2d | 2018-06-02 17:49:53 -0400 | [diff] [blame] | 3461 | } |
| 3462 | |
| 3463 | static int tun_get_link_ksettings(struct net_device *dev, |
| 3464 | struct ethtool_link_ksettings *cmd) |
| 3465 | { |
| 3466 | struct tun_struct *tun = netdev_priv(dev); |
| 3467 | |
| 3468 | memcpy(cmd, &tun->link_ksettings, sizeof(*cmd)); |
| 3469 | return 0; |
| 3470 | } |
| 3471 | |
| 3472 | static int tun_set_link_ksettings(struct net_device *dev, |
| 3473 | const struct ethtool_link_ksettings *cmd) |
| 3474 | { |
| 3475 | struct tun_struct *tun = netdev_priv(dev); |
| 3476 | |
| 3477 | memcpy(&tun->link_ksettings, cmd, sizeof(*cmd)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3478 | return 0; |
| 3479 | } |
| 3480 | |
| 3481 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) |
| 3482 | { |
| 3483 | struct tun_struct *tun = netdev_priv(dev); |
| 3484 | |
Rick Jones | 33a5ba1 | 2011-11-15 14:59:53 +0000 | [diff] [blame] | 3485 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
| 3486 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3487 | |
| 3488 | switch (tun->flags & TUN_TYPE_MASK) { |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 3489 | case IFF_TUN: |
Rick Jones | 33a5ba1 | 2011-11-15 14:59:53 +0000 | [diff] [blame] | 3490 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3491 | break; |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 3492 | case IFF_TAP: |
Rick Jones | 33a5ba1 | 2011-11-15 14:59:53 +0000 | [diff] [blame] | 3493 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3494 | break; |
| 3495 | } |
| 3496 | } |
| 3497 | |
| 3498 | static u32 tun_get_msglevel(struct net_device *dev) |
| 3499 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3500 | struct tun_struct *tun = netdev_priv(dev); |
Michal Kubecek | 3424170 | 2020-03-04 17:24:14 +0100 | [diff] [blame] | 3501 | |
| 3502 | return tun->msg_enable; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3503 | } |
| 3504 | |
| 3505 | static void tun_set_msglevel(struct net_device *dev, u32 value) |
| 3506 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3507 | struct tun_struct *tun = netdev_priv(dev); |
Michal Kubecek | 3424170 | 2020-03-04 17:24:14 +0100 | [diff] [blame] | 3508 | |
| 3509 | tun->msg_enable = value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3510 | } |
| 3511 | |
Jason Wang | 5503fce | 2017-01-18 15:02:03 +0800 | [diff] [blame] | 3512 | static int tun_get_coalesce(struct net_device *dev, |
| 3513 | struct ethtool_coalesce *ec) |
| 3514 | { |
| 3515 | struct tun_struct *tun = netdev_priv(dev); |
| 3516 | |
| 3517 | ec->rx_max_coalesced_frames = tun->rx_batched; |
| 3518 | |
| 3519 | return 0; |
| 3520 | } |
| 3521 | |
| 3522 | static int tun_set_coalesce(struct net_device *dev, |
| 3523 | struct ethtool_coalesce *ec) |
| 3524 | { |
| 3525 | struct tun_struct *tun = netdev_priv(dev); |
| 3526 | |
| 3527 | if (ec->rx_max_coalesced_frames > NAPI_POLL_WEIGHT) |
| 3528 | tun->rx_batched = NAPI_POLL_WEIGHT; |
| 3529 | else |
| 3530 | tun->rx_batched = ec->rx_max_coalesced_frames; |
| 3531 | |
| 3532 | return 0; |
| 3533 | } |
| 3534 | |
Jeff Garzik | 7282d49 | 2006-09-13 14:30:00 -0400 | [diff] [blame] | 3535 | static const struct ethtool_ops tun_ethtool_ops = { |
Jakub Kicinski | e5ad00b | 2020-03-05 17:05:58 -0800 | [diff] [blame] | 3536 | .supported_coalesce_params = ETHTOOL_COALESCE_RX_MAX_FRAMES, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3537 | .get_drvinfo = tun_get_drvinfo, |
| 3538 | .get_msglevel = tun_get_msglevel, |
| 3539 | .set_msglevel = tun_set_msglevel, |
Nolan Leake | bee3136 | 2010-07-27 13:53:43 +0000 | [diff] [blame] | 3540 | .get_link = ethtool_op_get_link, |
Richard Cochran | eda2977 | 2013-07-19 19:40:10 +0200 | [diff] [blame] | 3541 | .get_ts_info = ethtool_op_get_ts_info, |
Jason Wang | 5503fce | 2017-01-18 15:02:03 +0800 | [diff] [blame] | 3542 | .get_coalesce = tun_get_coalesce, |
| 3543 | .set_coalesce = tun_set_coalesce, |
Philippe Reynes | 29ccc49 | 2017-03-11 22:03:50 +0100 | [diff] [blame] | 3544 | .get_link_ksettings = tun_get_link_ksettings, |
Chas Williams | 4e24f2d | 2018-06-02 17:49:53 -0400 | [diff] [blame] | 3545 | .set_link_ksettings = tun_set_link_ksettings, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3546 | }; |
| 3547 | |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 3548 | static int tun_queue_resize(struct tun_struct *tun) |
| 3549 | { |
| 3550 | struct net_device *dev = tun->dev; |
| 3551 | struct tun_file *tfile; |
Jason Wang | 5990a30 | 2018-01-04 11:14:27 +0800 | [diff] [blame] | 3552 | struct ptr_ring **rings; |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 3553 | int n = tun->numqueues + tun->numdisabled; |
| 3554 | int ret, i; |
| 3555 | |
Jason Wang | 5990a30 | 2018-01-04 11:14:27 +0800 | [diff] [blame] | 3556 | rings = kmalloc_array(n, sizeof(*rings), GFP_KERNEL); |
| 3557 | if (!rings) |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 3558 | return -ENOMEM; |
| 3559 | |
| 3560 | for (i = 0; i < tun->numqueues; i++) { |
| 3561 | tfile = rtnl_dereference(tun->tfiles[i]); |
Jason Wang | 5990a30 | 2018-01-04 11:14:27 +0800 | [diff] [blame] | 3562 | rings[i] = &tfile->tx_ring; |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 3563 | } |
| 3564 | list_for_each_entry(tfile, &tun->disabled, next) |
Jason Wang | 5990a30 | 2018-01-04 11:14:27 +0800 | [diff] [blame] | 3565 | rings[i++] = &tfile->tx_ring; |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 3566 | |
Jason Wang | 5990a30 | 2018-01-04 11:14:27 +0800 | [diff] [blame] | 3567 | ret = ptr_ring_resize_multiple(rings, n, |
| 3568 | dev->tx_queue_len, GFP_KERNEL, |
Jason Wang | fc72d1d | 2018-01-04 11:14:28 +0800 | [diff] [blame] | 3569 | tun_ptr_free); |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 3570 | |
Jason Wang | 5990a30 | 2018-01-04 11:14:27 +0800 | [diff] [blame] | 3571 | kfree(rings); |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 3572 | return ret; |
| 3573 | } |
| 3574 | |
| 3575 | static int tun_device_event(struct notifier_block *unused, |
| 3576 | unsigned long event, void *ptr) |
| 3577 | { |
| 3578 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| 3579 | struct tun_struct *tun = netdev_priv(dev); |
Fei Li | 72b319d | 2019-06-17 21:26:36 +0800 | [diff] [blame] | 3580 | int i; |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 3581 | |
Craig Gallek | 86dfb4ac | 2016-07-06 18:44:20 -0400 | [diff] [blame] | 3582 | if (dev->rtnl_link_ops != &tun_link_ops) |
| 3583 | return NOTIFY_DONE; |
| 3584 | |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 3585 | switch (event) { |
| 3586 | case NETDEV_CHANGE_TX_QUEUE_LEN: |
| 3587 | if (tun_queue_resize(tun)) |
| 3588 | return NOTIFY_BAD; |
| 3589 | break; |
Fei Li | 72b319d | 2019-06-17 21:26:36 +0800 | [diff] [blame] | 3590 | case NETDEV_UP: |
| 3591 | for (i = 0; i < tun->numqueues; i++) { |
| 3592 | struct tun_file *tfile; |
| 3593 | |
| 3594 | tfile = rtnl_dereference(tun->tfiles[i]); |
| 3595 | tfile->socket.sk->sk_write_space(tfile->socket.sk); |
| 3596 | } |
| 3597 | break; |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 3598 | default: |
| 3599 | break; |
| 3600 | } |
| 3601 | |
| 3602 | return NOTIFY_DONE; |
| 3603 | } |
| 3604 | |
| 3605 | static struct notifier_block tun_notifier_block __read_mostly = { |
| 3606 | .notifier_call = tun_device_event, |
| 3607 | }; |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 3608 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3609 | static int __init tun_init(void) |
| 3610 | { |
| 3611 | int ret = 0; |
| 3612 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 3613 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3614 | |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 3615 | ret = rtnl_link_register(&tun_link_ops); |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 3616 | if (ret) { |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 3617 | pr_err("Can't register link_ops\n"); |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 3618 | goto err_linkops; |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 3619 | } |
| 3620 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3621 | ret = misc_register(&tun_miscdev); |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 3622 | if (ret) { |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 3623 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 3624 | goto err_misc; |
| 3625 | } |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 3626 | |
Tonghao Zhang | 5edfbd3 | 2017-07-20 02:41:34 -0700 | [diff] [blame] | 3627 | ret = register_netdevice_notifier(&tun_notifier_block); |
| 3628 | if (ret) { |
| 3629 | pr_err("Can't register netdevice notifier\n"); |
| 3630 | goto err_notifier; |
| 3631 | } |
| 3632 | |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 3633 | return 0; |
Tonghao Zhang | 5edfbd3 | 2017-07-20 02:41:34 -0700 | [diff] [blame] | 3634 | |
| 3635 | err_notifier: |
| 3636 | misc_deregister(&tun_miscdev); |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 3637 | err_misc: |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 3638 | rtnl_link_unregister(&tun_link_ops); |
| 3639 | err_linkops: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3640 | return ret; |
| 3641 | } |
| 3642 | |
| 3643 | static void tun_cleanup(void) |
| 3644 | { |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 3645 | misc_deregister(&tun_miscdev); |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 3646 | rtnl_link_unregister(&tun_link_ops); |
Jason Wang | 1576d98 | 2016-06-30 14:45:36 +0800 | [diff] [blame] | 3647 | unregister_netdevice_notifier(&tun_notifier_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3648 | } |
| 3649 | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 3650 | /* Get an underlying socket object from tun file. Returns error unless file is |
| 3651 | * attached to a device. The returned object works like a packet socket, it |
| 3652 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for |
| 3653 | * holding a reference to the file for as long as the socket is in use. */ |
| 3654 | struct socket *tun_get_socket(struct file *file) |
| 3655 | { |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 3656 | struct tun_file *tfile; |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 3657 | if (file->f_op != &tun_fops) |
| 3658 | return ERR_PTR(-EINVAL); |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 3659 | tfile = file->private_data; |
| 3660 | if (!tfile) |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 3661 | return ERR_PTR(-EBADFD); |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 3662 | return &tfile->socket; |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 3663 | } |
| 3664 | EXPORT_SYMBOL_GPL(tun_get_socket); |
| 3665 | |
Jason Wang | 5990a30 | 2018-01-04 11:14:27 +0800 | [diff] [blame] | 3666 | struct ptr_ring *tun_get_tx_ring(struct file *file) |
Jason Wang | 83339c6 | 2017-05-17 12:14:41 +0800 | [diff] [blame] | 3667 | { |
| 3668 | struct tun_file *tfile; |
| 3669 | |
| 3670 | if (file->f_op != &tun_fops) |
| 3671 | return ERR_PTR(-EINVAL); |
| 3672 | tfile = file->private_data; |
| 3673 | if (!tfile) |
| 3674 | return ERR_PTR(-EBADFD); |
Jason Wang | 5990a30 | 2018-01-04 11:14:27 +0800 | [diff] [blame] | 3675 | return &tfile->tx_ring; |
Jason Wang | 83339c6 | 2017-05-17 12:14:41 +0800 | [diff] [blame] | 3676 | } |
Jason Wang | 5990a30 | 2018-01-04 11:14:27 +0800 | [diff] [blame] | 3677 | EXPORT_SYMBOL_GPL(tun_get_tx_ring); |
Jason Wang | 83339c6 | 2017-05-17 12:14:41 +0800 | [diff] [blame] | 3678 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3679 | module_init(tun_init); |
| 3680 | module_exit(tun_cleanup); |
| 3681 | MODULE_DESCRIPTION(DRV_DESCRIPTION); |
| 3682 | MODULE_AUTHOR(DRV_COPYRIGHT); |
| 3683 | MODULE_LICENSE("GPL"); |
| 3684 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |
Kay Sievers | 578454f | 2010-05-20 18:07:20 +0200 | [diff] [blame] | 3685 | MODULE_ALIAS("devname:net/tun"); |