blob: 0c1f364044715f598c16356134667b94f6664c03 [file] [log] [blame]
Thomas Gleixnerc9422992019-05-29 07:12:43 -07001// SPDX-License-Identifier: GPL-2.0-only
Pravin B Shelarc5441932013-03-25 14:49:35 +00002/*
3 * Copyright (c) 2013 Nicira, Inc.
Pravin B Shelarc5441932013-03-25 14:49:35 +00004 */
5
6#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
8#include <linux/capability.h>
9#include <linux/module.h>
10#include <linux/types.h>
11#include <linux/kernel.h>
12#include <linux/slab.h>
13#include <linux/uaccess.h>
14#include <linux/skbuff.h>
15#include <linux/netdevice.h>
16#include <linux/in.h>
17#include <linux/tcp.h>
18#include <linux/udp.h>
19#include <linux/if_arp.h>
Pravin B Shelarc5441932013-03-25 14:49:35 +000020#include <linux/init.h>
21#include <linux/in6.h>
22#include <linux/inetdevice.h>
23#include <linux/igmp.h>
24#include <linux/netfilter_ipv4.h>
25#include <linux/etherdevice.h>
26#include <linux/if_ether.h>
27#include <linux/if_vlan.h>
28#include <linux/rculist.h>
Sachin Kamat27d79f32014-01-27 12:13:57 +053029#include <linux/err.h>
Pravin B Shelarc5441932013-03-25 14:49:35 +000030
31#include <net/sock.h>
32#include <net/ip.h>
33#include <net/icmp.h>
34#include <net/protocol.h>
35#include <net/ip_tunnels.h>
36#include <net/arp.h>
37#include <net/checksum.h>
38#include <net/dsfield.h>
39#include <net/inet_ecn.h>
40#include <net/xfrm.h>
41#include <net/net_namespace.h>
42#include <net/netns/generic.h>
43#include <net/rtnetlink.h>
Tom Herbert56328482014-09-17 12:25:58 -070044#include <net/udp.h>
Alexei Starovoitovcfc73812016-09-15 13:00:29 -070045#include <net/dst_metadata.h>
Tom Herbert63487ba2014-11-04 09:06:51 -080046
Pravin B Shelarc5441932013-03-25 14:49:35 +000047#if IS_ENABLED(CONFIG_IPV6)
48#include <net/ipv6.h>
49#include <net/ip6_fib.h>
50#include <net/ip6_route.h>
51#endif
52
Duan Jiong967680e2014-01-19 16:43:42 +080053static unsigned int ip_tunnel_hash(__be32 key, __be32 remote)
Pravin B Shelarc5441932013-03-25 14:49:35 +000054{
55 return hash_32((__force u32)key ^ (__force u32)remote,
56 IP_TNL_HASH_BITS);
57}
58
Pravin B Shelarc5441932013-03-25 14:49:35 +000059static bool ip_tunnel_key_match(const struct ip_tunnel_parm *p,
60 __be16 flags, __be32 key)
61{
62 if (p->i_flags & TUNNEL_KEY) {
63 if (flags & TUNNEL_KEY)
64 return key == p->i_key;
65 else
66 /* key expected, none present */
67 return false;
68 } else
69 return !(flags & TUNNEL_KEY);
70}
71
72/* Fallback tunnel: no source, no destination, no key, no options
73
74 Tunnel hash table:
75 We require exact key match i.e. if a key is present in packet
76 it will match only tunnel with the same key; if it is not present,
77 it will match only keyless tunnel.
78
79 All keysless packets, if not matched configured keyless tunnels
80 will match fallback tunnel.
81 Given src, dst and key, find appropriate for input tunnel.
82*/
83struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
84 int link, __be16 flags,
85 __be32 remote, __be32 local,
86 __be32 key)
87{
Pravin B Shelarc5441932013-03-25 14:49:35 +000088 struct ip_tunnel *t, *cand = NULL;
89 struct hlist_head *head;
Taehee Yooba615392020-06-16 16:51:51 +000090 struct net_device *ndev;
91 unsigned int hash;
Pravin B Shelarc5441932013-03-25 14:49:35 +000092
Duan Jiong967680e2014-01-19 16:43:42 +080093 hash = ip_tunnel_hash(key, remote);
Pravin B Shelarc5441932013-03-25 14:49:35 +000094 head = &itn->tunnels[hash];
95
96 hlist_for_each_entry_rcu(t, head, hash_node) {
97 if (local != t->parms.iph.saddr ||
98 remote != t->parms.iph.daddr ||
99 !(t->dev->flags & IFF_UP))
100 continue;
101
102 if (!ip_tunnel_key_match(&t->parms, flags, key))
103 continue;
104
105 if (t->parms.link == link)
106 return t;
107 else
108 cand = t;
109 }
110
111 hlist_for_each_entry_rcu(t, head, hash_node) {
112 if (remote != t->parms.iph.daddr ||
Dmitry Popove0056592014-07-05 02:26:37 +0400113 t->parms.iph.saddr != 0 ||
Pravin B Shelarc5441932013-03-25 14:49:35 +0000114 !(t->dev->flags & IFF_UP))
115 continue;
116
117 if (!ip_tunnel_key_match(&t->parms, flags, key))
118 continue;
119
120 if (t->parms.link == link)
121 return t;
122 else if (!cand)
123 cand = t;
124 }
125
Duan Jiong967680e2014-01-19 16:43:42 +0800126 hash = ip_tunnel_hash(key, 0);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000127 head = &itn->tunnels[hash];
128
129 hlist_for_each_entry_rcu(t, head, hash_node) {
Dmitry Popove0056592014-07-05 02:26:37 +0400130 if ((local != t->parms.iph.saddr || t->parms.iph.daddr != 0) &&
131 (local != t->parms.iph.daddr || !ipv4_is_multicast(local)))
132 continue;
133
134 if (!(t->dev->flags & IFF_UP))
Pravin B Shelarc5441932013-03-25 14:49:35 +0000135 continue;
136
137 if (!ip_tunnel_key_match(&t->parms, flags, key))
138 continue;
139
140 if (t->parms.link == link)
141 return t;
142 else if (!cand)
143 cand = t;
144 }
145
Pravin B Shelarc5441932013-03-25 14:49:35 +0000146 hlist_for_each_entry_rcu(t, head, hash_node) {
William Dauchy25629fd2020-03-27 19:56:39 +0100147 if ((!(flags & TUNNEL_NO_KEY) && t->parms.i_key != key) ||
Dmitry Popove0056592014-07-05 02:26:37 +0400148 t->parms.iph.saddr != 0 ||
149 t->parms.iph.daddr != 0 ||
Pravin B Shelarc5441932013-03-25 14:49:35 +0000150 !(t->dev->flags & IFF_UP))
151 continue;
152
153 if (t->parms.link == link)
154 return t;
155 else if (!cand)
156 cand = t;
157 }
158
Pravin B Shelarc5441932013-03-25 14:49:35 +0000159 if (cand)
160 return cand;
161
Pravin B Shelar2e15ea32015-08-07 23:51:42 -0700162 t = rcu_dereference(itn->collect_md_tun);
Haishuang Yan833a8b42017-09-12 17:47:56 +0800163 if (t && t->dev->flags & IFF_UP)
Pravin B Shelar2e15ea32015-08-07 23:51:42 -0700164 return t;
165
Taehee Yooba615392020-06-16 16:51:51 +0000166 ndev = READ_ONCE(itn->fb_tunnel_dev);
167 if (ndev && ndev->flags & IFF_UP)
168 return netdev_priv(ndev);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000169
Pravin B Shelarc5441932013-03-25 14:49:35 +0000170 return NULL;
171}
172EXPORT_SYMBOL_GPL(ip_tunnel_lookup);
173
174static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn,
175 struct ip_tunnel_parm *parms)
176{
177 unsigned int h;
178 __be32 remote;
Steffen Klassert6d608f02014-02-21 08:41:09 +0100179 __be32 i_key = parms->i_key;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000180
181 if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr))
182 remote = parms->iph.daddr;
183 else
184 remote = 0;
185
Steffen Klassert6d608f02014-02-21 08:41:09 +0100186 if (!(parms->i_flags & TUNNEL_KEY) && (parms->i_flags & VTI_ISVTI))
187 i_key = 0;
188
189 h = ip_tunnel_hash(i_key, remote);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000190 return &itn->tunnels[h];
191}
192
193static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t)
194{
195 struct hlist_head *head = ip_bucket(itn, &t->parms);
196
Pravin B Shelar2e15ea32015-08-07 23:51:42 -0700197 if (t->collect_md)
198 rcu_assign_pointer(itn->collect_md_tun, t);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000199 hlist_add_head_rcu(&t->hash_node, head);
200}
201
Pravin B Shelar2e15ea32015-08-07 23:51:42 -0700202static void ip_tunnel_del(struct ip_tunnel_net *itn, struct ip_tunnel *t)
Pravin B Shelarc5441932013-03-25 14:49:35 +0000203{
Pravin B Shelar2e15ea32015-08-07 23:51:42 -0700204 if (t->collect_md)
205 rcu_assign_pointer(itn->collect_md_tun, NULL);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000206 hlist_del_init_rcu(&t->hash_node);
207}
208
209static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn,
210 struct ip_tunnel_parm *parms,
211 int type)
212{
213 __be32 remote = parms->iph.daddr;
214 __be32 local = parms->iph.saddr;
215 __be32 key = parms->i_key;
Dmitry Popov5ce54af2014-06-08 03:03:08 +0400216 __be16 flags = parms->i_flags;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000217 int link = parms->link;
218 struct ip_tunnel *t = NULL;
219 struct hlist_head *head = ip_bucket(itn, parms);
220
221 hlist_for_each_entry_rcu(t, head, hash_node) {
222 if (local == t->parms.iph.saddr &&
223 remote == t->parms.iph.daddr &&
Pravin B Shelarc5441932013-03-25 14:49:35 +0000224 link == t->parms.link &&
Dmitry Popov5ce54af2014-06-08 03:03:08 +0400225 type == t->dev->type &&
226 ip_tunnel_key_match(&t->parms, flags, key))
Pravin B Shelarc5441932013-03-25 14:49:35 +0000227 break;
228 }
229 return t;
230}
231
232static struct net_device *__ip_tunnel_create(struct net *net,
233 const struct rtnl_link_ops *ops,
234 struct ip_tunnel_parm *parms)
235{
236 int err;
237 struct ip_tunnel *tunnel;
238 struct net_device *dev;
239 char name[IFNAMSIZ];
240
Eric Dumazet9cb726a2018-04-05 06:39:27 -0700241 err = -E2BIG;
242 if (parms->name[0]) {
243 if (!dev_valid_name(parms->name))
Pravin B Shelarc5441932013-03-25 14:49:35 +0000244 goto failed;
Eric Dumazet9cb726a2018-04-05 06:39:27 -0700245 strlcpy(name, parms->name, IFNAMSIZ);
246 } else {
247 if (strlen(ops->kind) > (IFNAMSIZ - 3))
248 goto failed;
Sultan Alsawaf000ade82018-06-06 15:56:54 -0700249 strcpy(name, ops->kind);
250 strcat(name, "%d");
Pravin B Shelarc5441932013-03-25 14:49:35 +0000251 }
252
253 ASSERT_RTNL();
Tom Gundersenc835a672014-07-14 16:37:24 +0200254 dev = alloc_netdev(ops->priv_size, name, NET_NAME_UNKNOWN, ops->setup);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000255 if (!dev) {
256 err = -ENOMEM;
257 goto failed;
258 }
259 dev_net_set(dev, net);
260
261 dev->rtnl_link_ops = ops;
262
263 tunnel = netdev_priv(dev);
264 tunnel->parms = *parms;
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +0200265 tunnel->net = net;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000266
267 err = register_netdevice(dev);
268 if (err)
269 goto failed_free;
270
271 return dev;
272
273failed_free:
274 free_netdev(dev);
275failed:
276 return ERR_PTR(err);
277}
278
Pravin B Shelarc5441932013-03-25 14:49:35 +0000279static int ip_tunnel_bind_dev(struct net_device *dev)
280{
281 struct net_device *tdev = NULL;
282 struct ip_tunnel *tunnel = netdev_priv(dev);
283 const struct iphdr *iph;
284 int hlen = LL_MAX_HEADER;
285 int mtu = ETH_DATA_LEN;
286 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
287
288 iph = &tunnel->parms.iph;
289
290 /* Guess output device to choose reasonable mtu and needed_headroom */
291 if (iph->daddr) {
292 struct flowi4 fl4;
293 struct rtable *rt;
294
Petr Machatab0066da2018-02-27 14:53:38 +0100295 ip_tunnel_init_flow(&fl4, iph->protocol, iph->daddr,
296 iph->saddr, tunnel->parms.o_key,
297 RT_TOS(iph->tos), tunnel->parms.link,
wenxu24ba1442019-02-24 11:36:20 +0800298 tunnel->fwmark, 0);
Tom Herbert7d442fa2014-01-02 11:48:26 -0800299 rt = ip_route_output_key(tunnel->net, &fl4);
300
Pravin B Shelarc5441932013-03-25 14:49:35 +0000301 if (!IS_ERR(rt)) {
302 tdev = rt->dst.dev;
303 ip_rt_put(rt);
304 }
305 if (dev->type != ARPHRD_ETHER)
306 dev->flags |= IFF_POINTOPOINT;
Paolo Abenif27337e2016-04-28 11:04:51 +0200307
308 dst_cache_reset(&tunnel->dst_cache);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000309 }
310
311 if (!tdev && tunnel->parms.link)
Nicolas Dichtel6c742e72013-08-13 17:51:11 +0200312 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000313
314 if (tdev) {
315 hlen = tdev->hard_header_len + tdev->needed_headroom;
Nicolas Dichtel82612de2018-05-31 10:59:32 +0200316 mtu = min(tdev->mtu, IP_MAX_MTU);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000317 }
Pravin B Shelarc5441932013-03-25 14:49:35 +0000318
319 dev->needed_headroom = t_hlen + hlen;
320 mtu -= (dev->hard_header_len + t_hlen);
321
Eric Dumazetb5476022017-12-11 07:17:39 -0800322 if (mtu < IPV4_MIN_MTU)
323 mtu = IPV4_MIN_MTU;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000324
325 return mtu;
326}
327
328static struct ip_tunnel *ip_tunnel_create(struct net *net,
329 struct ip_tunnel_net *itn,
330 struct ip_tunnel_parm *parms)
331{
Julia Lawall4929fd82014-05-15 05:43:20 +0200332 struct ip_tunnel *nt;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000333 struct net_device *dev;
Jarod Wilsonb96f9af2016-10-20 13:55:24 -0400334 int t_hlen;
Petr Machataf6cc9c02018-03-22 19:53:33 +0200335 int mtu;
336 int err;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000337
Eric Dumazet79134e62018-03-08 12:51:41 -0800338 dev = __ip_tunnel_create(net, itn->rtnl_link_ops, parms);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000339 if (IS_ERR(dev))
Florian Westphal6dd3c9e2014-02-14 13:14:39 +0100340 return ERR_CAST(dev);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000341
Petr Machataf6cc9c02018-03-22 19:53:33 +0200342 mtu = ip_tunnel_bind_dev(dev);
343 err = dev_set_mtu(dev, mtu);
344 if (err)
345 goto err_dev_set_mtu;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000346
347 nt = netdev_priv(dev);
Jarod Wilsonb96f9af2016-10-20 13:55:24 -0400348 t_hlen = nt->hlen + sizeof(struct iphdr);
349 dev->min_mtu = ETH_MIN_MTU;
Nicolas Dichtel82612de2018-05-31 10:59:32 +0200350 dev->max_mtu = IP_MAX_MTU - dev->hard_header_len - t_hlen;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000351 ip_tunnel_add(itn, nt);
352 return nt;
Petr Machataf6cc9c02018-03-22 19:53:33 +0200353
354err_dev_set_mtu:
355 unregister_netdevice(dev);
356 return ERR_PTR(err);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000357}
358
359int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
Pravin B Shelar2e15ea32015-08-07 23:51:42 -0700360 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
361 bool log_ecn_error)
Pravin B Shelarc5441932013-03-25 14:49:35 +0000362{
Li RongQing8f849852014-01-04 13:57:59 +0800363 struct pcpu_sw_netstats *tstats;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000364 const struct iphdr *iph = ip_hdr(skb);
365 int err;
366
Pravin B Shelarc5441932013-03-25 14:49:35 +0000367#ifdef CONFIG_NET_IPGRE_BROADCAST
368 if (ipv4_is_multicast(iph->daddr)) {
Pravin B Shelarc5441932013-03-25 14:49:35 +0000369 tunnel->dev->stats.multicast++;
370 skb->pkt_type = PACKET_BROADCAST;
371 }
372#endif
373
374 if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) ||
375 ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) {
376 tunnel->dev->stats.rx_crc_errors++;
377 tunnel->dev->stats.rx_errors++;
378 goto drop;
379 }
380
381 if (tunnel->parms.i_flags&TUNNEL_SEQ) {
382 if (!(tpi->flags&TUNNEL_SEQ) ||
383 (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
384 tunnel->dev->stats.rx_fifo_errors++;
385 tunnel->dev->stats.rx_errors++;
386 goto drop;
387 }
388 tunnel->i_seqno = ntohl(tpi->seq) + 1;
389 }
390
Ying Caie96f2e72014-05-04 15:20:04 -0700391 skb_reset_network_header(skb);
392
Pravin B Shelarc5441932013-03-25 14:49:35 +0000393 err = IP_ECN_decapsulate(iph, skb);
394 if (unlikely(err)) {
395 if (log_ecn_error)
396 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
397 &iph->saddr, iph->tos);
398 if (err > 1) {
399 ++tunnel->dev->stats.rx_frame_errors;
400 ++tunnel->dev->stats.rx_errors;
401 goto drop;
402 }
403 }
404
405 tstats = this_cpu_ptr(tunnel->dev->tstats);
406 u64_stats_update_begin(&tstats->syncp);
407 tstats->rx_packets++;
408 tstats->rx_bytes += skb->len;
409 u64_stats_update_end(&tstats->syncp);
410
Alexei Starovoitov81b9eab2013-11-12 14:39:13 -0800411 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
412
Pravin B Shelar3d7b46c2013-06-17 17:50:02 -0700413 if (tunnel->dev->type == ARPHRD_ETHER) {
414 skb->protocol = eth_type_trans(skb, tunnel->dev);
415 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
416 } else {
417 skb->dev = tunnel->dev;
418 }
Nicolas Dichtel64261f22013-08-13 17:51:09 +0200419
Pravin B Shelar2e15ea32015-08-07 23:51:42 -0700420 if (tun_dst)
421 skb_dst_set(skb, (struct dst_entry *)tun_dst);
422
Pravin B Shelarc5441932013-03-25 14:49:35 +0000423 gro_cells_receive(&tunnel->gro_cells, skb);
424 return 0;
425
426drop:
Haishuang Yan469f87e2017-06-15 10:29:29 +0800427 if (tun_dst)
428 dst_release((struct dst_entry *)tun_dst);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000429 kfree_skb(skb);
430 return 0;
431}
432EXPORT_SYMBOL_GPL(ip_tunnel_rcv);
433
Tom Herberta8c5f902014-11-12 11:54:09 -0800434int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *ops,
435 unsigned int num)
436{
Thomas Grafbb1553c2014-12-16 21:05:20 +0100437 if (num >= MAX_IPTUN_ENCAP_OPS)
438 return -ERANGE;
439
Tom Herberta8c5f902014-11-12 11:54:09 -0800440 return !cmpxchg((const struct ip_tunnel_encap_ops **)
441 &iptun_encaps[num],
442 NULL, ops) ? 0 : -1;
443}
444EXPORT_SYMBOL(ip_tunnel_encap_add_ops);
445
446int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *ops,
447 unsigned int num)
448{
449 int ret;
450
Thomas Grafbb1553c2014-12-16 21:05:20 +0100451 if (num >= MAX_IPTUN_ENCAP_OPS)
452 return -ERANGE;
453
Tom Herberta8c5f902014-11-12 11:54:09 -0800454 ret = (cmpxchg((const struct ip_tunnel_encap_ops **)
455 &iptun_encaps[num],
456 ops, NULL) == ops) ? 0 : -1;
457
458 synchronize_net();
459
460 return ret;
461}
462EXPORT_SYMBOL(ip_tunnel_encap_del_ops);
463
Tom Herbert56328482014-09-17 12:25:58 -0700464int ip_tunnel_encap_setup(struct ip_tunnel *t,
465 struct ip_tunnel_encap *ipencap)
466{
467 int hlen;
468
469 memset(&t->encap, 0, sizeof(t->encap));
470
471 hlen = ip_encap_hlen(ipencap);
472 if (hlen < 0)
473 return hlen;
474
475 t->encap.type = ipencap->type;
476 t->encap.sport = ipencap->sport;
477 t->encap.dport = ipencap->dport;
478 t->encap.flags = ipencap->flags;
479
480 t->encap_hlen = hlen;
481 t->hlen = t->encap_hlen + t->tun_hlen;
482
483 return 0;
484}
485EXPORT_SYMBOL_GPL(ip_tunnel_encap_setup);
486
Pravin B Shelar23a36472013-07-02 10:57:33 -0700487static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb,
Timo Teräsfc24f2b22015-07-07 08:34:13 +0300488 struct rtable *rt, __be16 df,
wenxuc8b34e62019-01-22 18:39:50 +0800489 const struct iphdr *inner_iph,
490 int tunnel_hlen, __be32 dst, bool md)
Pravin B Shelar23a36472013-07-02 10:57:33 -0700491{
492 struct ip_tunnel *tunnel = netdev_priv(dev);
wenxuc8b34e62019-01-22 18:39:50 +0800493 int pkt_size;
Pravin B Shelar23a36472013-07-02 10:57:33 -0700494 int mtu;
495
wenxuc8b34e62019-01-22 18:39:50 +0800496 tunnel_hlen = md ? tunnel_hlen : tunnel->hlen;
497 pkt_size = skb->len - tunnel_hlen - dev->hard_header_len;
498
Pravin B Shelar23a36472013-07-02 10:57:33 -0700499 if (df)
500 mtu = dst_mtu(&rt->dst) - dev->hard_header_len
wenxuc8b34e62019-01-22 18:39:50 +0800501 - sizeof(struct iphdr) - tunnel_hlen;
Pravin B Shelar23a36472013-07-02 10:57:33 -0700502 else
Alan Maguiref4b3ec42019-03-06 10:25:42 +0000503 mtu = skb_valid_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
Pravin B Shelar23a36472013-07-02 10:57:33 -0700504
Alan Maguiref4b3ec42019-03-06 10:25:42 +0000505 if (skb_valid_dst(skb))
Hangbin Liu7a1592b2019-12-22 10:51:13 +0800506 skb_dst_update_pmtu_no_confirm(skb, mtu);
Pravin B Shelar23a36472013-07-02 10:57:33 -0700507
508 if (skb->protocol == htons(ETH_P_IP)) {
509 if (!skb_is_gso(skb) &&
Timo Teräsfc24f2b22015-07-07 08:34:13 +0300510 (inner_iph->frag_off & htons(IP_DF)) &&
511 mtu < pkt_size) {
Pravin B Shelar23a36472013-07-02 10:57:33 -0700512 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
513 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
514 return -E2BIG;
515 }
516 }
517#if IS_ENABLED(CONFIG_IPV6)
518 else if (skb->protocol == htons(ETH_P_IPV6)) {
Alan Maguiref4b3ec42019-03-06 10:25:42 +0000519 struct rt6_info *rt6;
wenxuc8b34e62019-01-22 18:39:50 +0800520 __be32 daddr;
521
Alan Maguiref4b3ec42019-03-06 10:25:42 +0000522 rt6 = skb_valid_dst(skb) ? (struct rt6_info *)skb_dst(skb) :
523 NULL;
wenxuc8b34e62019-01-22 18:39:50 +0800524 daddr = md ? dst : tunnel->parms.iph.daddr;
Pravin B Shelar23a36472013-07-02 10:57:33 -0700525
526 if (rt6 && mtu < dst_mtu(skb_dst(skb)) &&
527 mtu >= IPV6_MIN_MTU) {
wenxuc8b34e62019-01-22 18:39:50 +0800528 if ((daddr && !ipv4_is_multicast(daddr)) ||
Pravin B Shelar23a36472013-07-02 10:57:33 -0700529 rt6->rt6i_dst.plen == 128) {
530 rt6->rt6i_flags |= RTF_MODIFIED;
531 dst_metric_set(skb_dst(skb), RTAX_MTU, mtu);
532 }
533 }
534
535 if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU &&
536 mtu < pkt_size) {
537 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
538 return -E2BIG;
539 }
540 }
541#endif
542 return 0;
543}
544
wenxuc8b34e62019-01-22 18:39:50 +0800545void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
546 u8 proto, int tunnel_hlen)
Alexei Starovoitovcfc73812016-09-15 13:00:29 -0700547{
548 struct ip_tunnel *tunnel = netdev_priv(dev);
549 u32 headroom = sizeof(struct iphdr);
550 struct ip_tunnel_info *tun_info;
551 const struct ip_tunnel_key *key;
552 const struct iphdr *inner_iph;
wenxuf46fe4f2019-01-22 18:39:49 +0800553 struct rtable *rt = NULL;
Alexei Starovoitovcfc73812016-09-15 13:00:29 -0700554 struct flowi4 fl4;
555 __be16 df = 0;
556 u8 tos, ttl;
wenxuf46fe4f2019-01-22 18:39:49 +0800557 bool use_cache;
Alexei Starovoitovcfc73812016-09-15 13:00:29 -0700558
559 tun_info = skb_tunnel_info(skb);
560 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
561 ip_tunnel_info_af(tun_info) != AF_INET))
562 goto tx_error;
563 key = &tun_info->key;
564 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
565 inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
566 tos = key->tos;
567 if (tos == 1) {
568 if (skb->protocol == htons(ETH_P_IP))
569 tos = inner_iph->tos;
570 else if (skb->protocol == htons(ETH_P_IPV6))
571 tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph);
572 }
wenxu6e6b9042019-01-22 18:39:51 +0800573 ip_tunnel_init_flow(&fl4, proto, key->u.ipv4.dst, key->u.ipv4.src,
574 tunnel_id_to_key32(key->tun_id), RT_TOS(tos),
wenxu24ba1442019-02-24 11:36:20 +0800575 0, skb->mark, skb_get_hash(skb));
Alexei Starovoitovcfc73812016-09-15 13:00:29 -0700576 if (tunnel->encap.type != TUNNEL_ENCAP_NONE)
577 goto tx_error;
wenxuf46fe4f2019-01-22 18:39:49 +0800578
579 use_cache = ip_tunnel_dst_cache_usable(skb, tun_info);
580 if (use_cache)
581 rt = dst_cache_get_ip4(&tun_info->dst_cache, &fl4.saddr);
582 if (!rt) {
583 rt = ip_route_output_key(tunnel->net, &fl4);
584 if (IS_ERR(rt)) {
585 dev->stats.tx_carrier_errors++;
586 goto tx_error;
587 }
588 if (use_cache)
589 dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst,
590 fl4.saddr);
Alexei Starovoitovcfc73812016-09-15 13:00:29 -0700591 }
592 if (rt->dst.dev == dev) {
593 ip_rt_put(rt);
594 dev->stats.collisions++;
595 goto tx_error;
596 }
wenxuc8b34e62019-01-22 18:39:50 +0800597
598 if (key->tun_flags & TUNNEL_DONT_FRAGMENT)
599 df = htons(IP_DF);
600 if (tnl_update_pmtu(dev, skb, rt, df, inner_iph, tunnel_hlen,
601 key->u.ipv4.dst, true)) {
602 ip_rt_put(rt);
603 goto tx_error;
604 }
605
Alexei Starovoitovcfc73812016-09-15 13:00:29 -0700606 tos = ip_tunnel_ecn_encap(tos, inner_iph, skb);
607 ttl = key->ttl;
608 if (ttl == 0) {
609 if (skb->protocol == htons(ETH_P_IP))
610 ttl = inner_iph->ttl;
611 else if (skb->protocol == htons(ETH_P_IPV6))
612 ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit;
613 else
614 ttl = ip4_dst_hoplimit(&rt->dst);
615 }
wenxuc8b34e62019-01-22 18:39:50 +0800616
617 if (!df && skb->protocol == htons(ETH_P_IP))
Alexei Starovoitovcfc73812016-09-15 13:00:29 -0700618 df = inner_iph->frag_off & htons(IP_DF);
wenxuc8b34e62019-01-22 18:39:50 +0800619
Alexei Starovoitovcfc73812016-09-15 13:00:29 -0700620 headroom += LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len;
621 if (headroom > dev->needed_headroom)
622 dev->needed_headroom = headroom;
623
624 if (skb_cow_head(skb, dev->needed_headroom)) {
625 ip_rt_put(rt);
626 goto tx_dropped;
627 }
Haishuang Yan0f693f12017-09-07 14:08:34 +0800628 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, proto, tos, ttl,
629 df, !net_eq(tunnel->net, dev_net(dev)));
Alexei Starovoitovcfc73812016-09-15 13:00:29 -0700630 return;
631tx_error:
632 dev->stats.tx_errors++;
633 goto kfree;
634tx_dropped:
635 dev->stats.tx_dropped++;
636kfree:
637 kfree_skb(skb);
638}
639EXPORT_SYMBOL_GPL(ip_md_tunnel_xmit);
640
Pravin B Shelarc5441932013-03-25 14:49:35 +0000641void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
Tom Herbert56328482014-09-17 12:25:58 -0700642 const struct iphdr *tnl_params, u8 protocol)
Pravin B Shelarc5441932013-03-25 14:49:35 +0000643{
644 struct ip_tunnel *tunnel = netdev_priv(dev);
wenxu186d9362019-02-24 08:24:45 +0800645 struct ip_tunnel_info *tun_info = NULL;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000646 const struct iphdr *inner_iph;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000647 unsigned int max_headroom; /* The extra header space needed */
wenxu186d9362019-02-24 08:24:45 +0800648 struct rtable *rt = NULL; /* Route to the other host */
649 bool use_cache = false;
650 struct flowi4 fl4;
651 bool md = false;
Timo Teräs22fb22e2014-05-16 08:34:39 +0300652 bool connected;
wenxu186d9362019-02-24 08:24:45 +0800653 u8 tos, ttl;
654 __be32 dst;
655 __be16 df;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000656
657 inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
Timo Teräs22fb22e2014-05-16 08:34:39 +0300658 connected = (tunnel->parms.iph.daddr != 0);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000659
Bernie Harris5146d1f2016-02-22 12:58:05 +1300660 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
661
Pravin B Shelarc5441932013-03-25 14:49:35 +0000662 dst = tnl_params->daddr;
663 if (dst == 0) {
664 /* NBMA tunnel */
665
Ian Morris51456b22015-04-03 09:17:26 +0100666 if (!skb_dst(skb)) {
Pravin B Shelarc5441932013-03-25 14:49:35 +0000667 dev->stats.tx_fifo_errors++;
668 goto tx_error;
669 }
670
wenxud71b57532019-01-19 13:11:25 +0800671 tun_info = skb_tunnel_info(skb);
672 if (tun_info && (tun_info->mode & IP_TUNNEL_INFO_TX) &&
673 ip_tunnel_info_af(tun_info) == AF_INET &&
wenxu186d9362019-02-24 08:24:45 +0800674 tun_info->key.u.ipv4.dst) {
wenxud71b57532019-01-19 13:11:25 +0800675 dst = tun_info->key.u.ipv4.dst;
wenxu186d9362019-02-24 08:24:45 +0800676 md = true;
677 connected = true;
678 }
wenxud71b57532019-01-19 13:11:25 +0800679 else if (skb->protocol == htons(ETH_P_IP)) {
Pravin B Shelarc5441932013-03-25 14:49:35 +0000680 rt = skb_rtable(skb);
681 dst = rt_nexthop(rt, inner_iph->daddr);
682 }
683#if IS_ENABLED(CONFIG_IPV6)
684 else if (skb->protocol == htons(ETH_P_IPV6)) {
685 const struct in6_addr *addr6;
686 struct neighbour *neigh;
687 bool do_tx_error_icmp;
688 int addr_type;
689
690 neigh = dst_neigh_lookup(skb_dst(skb),
691 &ipv6_hdr(skb)->daddr);
Ian Morris51456b22015-04-03 09:17:26 +0100692 if (!neigh)
Pravin B Shelarc5441932013-03-25 14:49:35 +0000693 goto tx_error;
694
695 addr6 = (const struct in6_addr *)&neigh->primary_key;
696 addr_type = ipv6_addr_type(addr6);
697
698 if (addr_type == IPV6_ADDR_ANY) {
699 addr6 = &ipv6_hdr(skb)->daddr;
700 addr_type = ipv6_addr_type(addr6);
701 }
702
703 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
704 do_tx_error_icmp = true;
705 else {
706 do_tx_error_icmp = false;
707 dst = addr6->s6_addr32[3];
708 }
709 neigh_release(neigh);
710 if (do_tx_error_icmp)
711 goto tx_error_icmp;
712 }
713#endif
714 else
715 goto tx_error;
Tom Herbert7d442fa2014-01-02 11:48:26 -0800716
wenxu186d9362019-02-24 08:24:45 +0800717 if (!md)
718 connected = false;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000719 }
720
721 tos = tnl_params->tos;
722 if (tos & 0x1) {
723 tos &= ~0x1;
Tom Herbert7d442fa2014-01-02 11:48:26 -0800724 if (skb->protocol == htons(ETH_P_IP)) {
Pravin B Shelarc5441932013-03-25 14:49:35 +0000725 tos = inner_iph->tos;
Tom Herbert7d442fa2014-01-02 11:48:26 -0800726 connected = false;
727 } else if (skb->protocol == htons(ETH_P_IPV6)) {
Pravin B Shelarc5441932013-03-25 14:49:35 +0000728 tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph);
Tom Herbert7d442fa2014-01-02 11:48:26 -0800729 connected = false;
730 }
Pravin B Shelarc5441932013-03-25 14:49:35 +0000731 }
732
David S. Miller0f3e9c92018-03-06 00:53:44 -0500733 ip_tunnel_init_flow(&fl4, protocol, dst, tnl_params->saddr,
734 tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link,
wenxu24ba1442019-02-24 11:36:20 +0800735 tunnel->fwmark, skb_get_hash(skb));
Tom Herbert7d442fa2014-01-02 11:48:26 -0800736
Tom Herbert56328482014-09-17 12:25:58 -0700737 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0)
738 goto tx_error;
739
wenxu186d9362019-02-24 08:24:45 +0800740 if (connected && md) {
741 use_cache = ip_tunnel_dst_cache_usable(skb, tun_info);
742 if (use_cache)
743 rt = dst_cache_get_ip4(&tun_info->dst_cache,
744 &fl4.saddr);
745 } else {
746 rt = connected ? dst_cache_get_ip4(&tunnel->dst_cache,
747 &fl4.saddr) : NULL;
748 }
Tom Herbert7d442fa2014-01-02 11:48:26 -0800749
750 if (!rt) {
751 rt = ip_route_output_key(tunnel->net, &fl4);
752
753 if (IS_ERR(rt)) {
754 dev->stats.tx_carrier_errors++;
755 goto tx_error;
756 }
wenxu186d9362019-02-24 08:24:45 +0800757 if (use_cache)
758 dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst,
759 fl4.saddr);
760 else if (!md && connected)
Paolo Abenie09acdd2016-02-12 15:43:55 +0100761 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst,
762 fl4.saddr);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000763 }
Tom Herbert7d442fa2014-01-02 11:48:26 -0800764
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -0700765 if (rt->dst.dev == dev) {
Pravin B Shelarc5441932013-03-25 14:49:35 +0000766 ip_rt_put(rt);
767 dev->stats.collisions++;
768 goto tx_error;
769 }
Pravin B Shelarc5441932013-03-25 14:49:35 +0000770
wenxuc8b34e62019-01-22 18:39:50 +0800771 if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off, inner_iph,
772 0, 0, false)) {
Pravin B Shelar23a36472013-07-02 10:57:33 -0700773 ip_rt_put(rt);
774 goto tx_error;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000775 }
Pravin B Shelarc5441932013-03-25 14:49:35 +0000776
777 if (tunnel->err_count > 0) {
778 if (time_before(jiffies,
779 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
780 tunnel->err_count--;
781
782 dst_link_failure(skb);
783 } else
784 tunnel->err_count = 0;
785 }
786
Pravin B Shelard4a71b12013-09-25 09:57:47 -0700787 tos = ip_tunnel_ecn_encap(tos, inner_iph, skb);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000788 ttl = tnl_params->ttl;
789 if (ttl == 0) {
790 if (skb->protocol == htons(ETH_P_IP))
791 ttl = inner_iph->ttl;
792#if IS_ENABLED(CONFIG_IPV6)
793 else if (skb->protocol == htons(ETH_P_IPV6))
794 ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit;
795#endif
796 else
797 ttl = ip4_dst_hoplimit(&rt->dst);
798 }
799
Pravin B Shelar23a36472013-07-02 10:57:33 -0700800 df = tnl_params->frag_off;
Philip Prindeville22a59be2016-06-14 15:53:02 -0600801 if (skb->protocol == htons(ETH_P_IP) && !tunnel->ignore_df)
Pravin B Shelar23a36472013-07-02 10:57:33 -0700802 df |= (inner_iph->frag_off&htons(IP_DF));
803
Pravin B Shelar0e6fbc52013-06-17 17:49:56 -0700804 max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr)
Tom Herbert7371e022014-10-03 15:48:07 -0700805 + rt->dst.header_len + ip_encap_hlen(&tunnel->encap);
Steffen Klassert3e08f4a2013-10-01 11:33:59 +0200806 if (max_headroom > dev->needed_headroom)
Pravin B Shelarc5441932013-03-25 14:49:35 +0000807 dev->needed_headroom = max_headroom;
Steffen Klassert3e08f4a2013-10-01 11:33:59 +0200808
809 if (skb_cow_head(skb, dev->needed_headroom)) {
Dmitry Popov586d5fc2014-06-06 04:34:37 +0400810 ip_rt_put(rt);
Steffen Klassert3e08f4a2013-10-01 11:33:59 +0200811 dev->stats.tx_dropped++;
Eric Dumazet3acfa1e2014-01-18 18:27:49 -0800812 kfree_skb(skb);
Steffen Klassert3e08f4a2013-10-01 11:33:59 +0200813 return;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000814 }
815
Pravin B Shelar039f5062015-12-24 14:34:54 -0800816 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl,
817 df, !net_eq(tunnel->net, dev_net(dev)));
Pravin B Shelarc5441932013-03-25 14:49:35 +0000818 return;
819
820#if IS_ENABLED(CONFIG_IPV6)
821tx_error_icmp:
822 dst_link_failure(skb);
823#endif
824tx_error:
825 dev->stats.tx_errors++;
Eric Dumazet3acfa1e2014-01-18 18:27:49 -0800826 kfree_skb(skb);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000827}
828EXPORT_SYMBOL_GPL(ip_tunnel_xmit);
829
830static void ip_tunnel_update(struct ip_tunnel_net *itn,
831 struct ip_tunnel *t,
832 struct net_device *dev,
833 struct ip_tunnel_parm *p,
Craig Gallek9830ad42017-04-19 12:30:54 -0400834 bool set_mtu,
835 __u32 fwmark)
Pravin B Shelarc5441932013-03-25 14:49:35 +0000836{
Pravin B Shelar2e15ea32015-08-07 23:51:42 -0700837 ip_tunnel_del(itn, t);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000838 t->parms.iph.saddr = p->iph.saddr;
839 t->parms.iph.daddr = p->iph.daddr;
840 t->parms.i_key = p->i_key;
841 t->parms.o_key = p->o_key;
842 if (dev->type != ARPHRD_ETHER) {
843 memcpy(dev->dev_addr, &p->iph.saddr, 4);
844 memcpy(dev->broadcast, &p->iph.daddr, 4);
845 }
846 ip_tunnel_add(itn, t);
847
848 t->parms.iph.ttl = p->iph.ttl;
849 t->parms.iph.tos = p->iph.tos;
850 t->parms.iph.frag_off = p->iph.frag_off;
851
Craig Gallek9830ad42017-04-19 12:30:54 -0400852 if (t->parms.link != p->link || t->fwmark != fwmark) {
Pravin B Shelarc5441932013-03-25 14:49:35 +0000853 int mtu;
854
855 t->parms.link = p->link;
Craig Gallek9830ad42017-04-19 12:30:54 -0400856 t->fwmark = fwmark;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000857 mtu = ip_tunnel_bind_dev(dev);
858 if (set_mtu)
859 dev->mtu = mtu;
860 }
Paolo Abenie09acdd2016-02-12 15:43:55 +0100861 dst_cache_reset(&t->dst_cache);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000862 netdev_state_change(dev);
863}
864
Christoph Hellwig607259a62020-05-19 15:03:13 +0200865int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
Pravin B Shelarc5441932013-03-25 14:49:35 +0000866{
867 int err = 0;
Nicolas Dichtel8c923ce2014-04-16 11:19:32 +0200868 struct ip_tunnel *t = netdev_priv(dev);
869 struct net *net = t->net;
870 struct ip_tunnel_net *itn = net_generic(net, t->ip_tnl_net_id);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000871
Pravin B Shelarc5441932013-03-25 14:49:35 +0000872 switch (cmd) {
873 case SIOCGETTUNNEL:
Nicolas Dichtel8c923ce2014-04-16 11:19:32 +0200874 if (dev == itn->fb_tunnel_dev) {
Pravin B Shelarc5441932013-03-25 14:49:35 +0000875 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
Ian Morris51456b22015-04-03 09:17:26 +0100876 if (!t)
Nicolas Dichtel8c923ce2014-04-16 11:19:32 +0200877 t = netdev_priv(dev);
878 }
Pravin B Shelarc5441932013-03-25 14:49:35 +0000879 memcpy(p, &t->parms, sizeof(*p));
880 break;
881
882 case SIOCADDTUNNEL:
883 case SIOCCHGTUNNEL:
884 err = -EPERM;
885 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
886 goto done;
887 if (p->iph.ttl)
888 p->iph.frag_off |= htons(IP_DF);
Dmitry Popov7c8e6b92014-06-08 02:06:25 +0400889 if (!(p->i_flags & VTI_ISVTI)) {
890 if (!(p->i_flags & TUNNEL_KEY))
891 p->i_key = 0;
892 if (!(p->o_flags & TUNNEL_KEY))
893 p->o_key = 0;
894 }
Pravin B Shelarc5441932013-03-25 14:49:35 +0000895
Eric Dumazet79134e62018-03-08 12:51:41 -0800896 t = ip_tunnel_find(itn, p, itn->type);
Pravin B Shelarc5441932013-03-25 14:49:35 +0000897
Steffen Klassertd61746b2014-09-22 09:11:08 +0200898 if (cmd == SIOCADDTUNNEL) {
899 if (!t) {
900 t = ip_tunnel_create(net, itn, p);
901 err = PTR_ERR_OR_ZERO(t);
902 break;
903 }
904
905 err = -EEXIST;
Duan Jiongee30ef4d2014-05-15 13:07:02 +0800906 break;
Florian Westphal6dd3c9e2014-02-14 13:14:39 +0100907 }
Pravin B Shelarc5441932013-03-25 14:49:35 +0000908 if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
Ian Morris00db4122015-04-03 09:17:27 +0100909 if (t) {
Pravin B Shelarc5441932013-03-25 14:49:35 +0000910 if (t->dev != dev) {
911 err = -EEXIST;
912 break;
913 }
914 } else {
915 unsigned int nflags = 0;
916
917 if (ipv4_is_multicast(p->iph.daddr))
918 nflags = IFF_BROADCAST;
919 else if (p->iph.daddr)
920 nflags = IFF_POINTOPOINT;
921
922 if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) {
923 err = -EINVAL;
924 break;
925 }
926
927 t = netdev_priv(dev);
928 }
929 }
930
931 if (t) {
932 err = 0;
Craig Gallek9830ad42017-04-19 12:30:54 -0400933 ip_tunnel_update(itn, t, dev, p, true, 0);
Florian Westphal6dd3c9e2014-02-14 13:14:39 +0100934 } else {
935 err = -ENOENT;
936 }
Pravin B Shelarc5441932013-03-25 14:49:35 +0000937 break;
938
939 case SIOCDELTUNNEL:
940 err = -EPERM;
941 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
942 goto done;
943
944 if (dev == itn->fb_tunnel_dev) {
945 err = -ENOENT;
946 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
Ian Morris51456b22015-04-03 09:17:26 +0100947 if (!t)
Pravin B Shelarc5441932013-03-25 14:49:35 +0000948 goto done;
949 err = -EPERM;
950 if (t == netdev_priv(itn->fb_tunnel_dev))
951 goto done;
952 dev = t->dev;
953 }
954 unregister_netdevice(dev);
955 err = 0;
956 break;
957
958 default:
959 err = -EINVAL;
960 }
961
962done:
963 return err;
964}
Christoph Hellwig607259a62020-05-19 15:03:13 +0200965EXPORT_SYMBOL_GPL(ip_tunnel_ctl);
966
967int ip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
968{
969 struct ip_tunnel_parm p;
970 int err;
971
972 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
973 return -EFAULT;
974 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, cmd);
975 if (!err && copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
976 return -EFAULT;
977 return err;
978}
Pravin B Shelarc5441932013-03-25 14:49:35 +0000979EXPORT_SYMBOL_GPL(ip_tunnel_ioctl);
980
David Wragg7e059152016-02-10 00:05:58 +0000981int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict)
Pravin B Shelarc5441932013-03-25 14:49:35 +0000982{
983 struct ip_tunnel *tunnel = netdev_priv(dev);
984 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
Nicolas Dichtel82612de2018-05-31 10:59:32 +0200985 int max_mtu = IP_MAX_MTU - dev->hard_header_len - t_hlen;
Pravin B Shelarc5441932013-03-25 14:49:35 +0000986
Jarod Wilsonb96f9af2016-10-20 13:55:24 -0400987 if (new_mtu < ETH_MIN_MTU)
Pravin B Shelarc5441932013-03-25 14:49:35 +0000988 return -EINVAL;
David Wragg7e059152016-02-10 00:05:58 +0000989
990 if (new_mtu > max_mtu) {
991 if (strict)
992 return -EINVAL;
993
994 new_mtu = max_mtu;
995 }
996
Pravin B Shelarc5441932013-03-25 14:49:35 +0000997 dev->mtu = new_mtu;
998 return 0;
999}
David Wragg7e059152016-02-10 00:05:58 +00001000EXPORT_SYMBOL_GPL(__ip_tunnel_change_mtu);
1001
1002int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1003{
1004 return __ip_tunnel_change_mtu(dev, new_mtu, true);
1005}
Pravin B Shelarc5441932013-03-25 14:49:35 +00001006EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu);
1007
1008static void ip_tunnel_dev_free(struct net_device *dev)
1009{
1010 struct ip_tunnel *tunnel = netdev_priv(dev);
1011
1012 gro_cells_destroy(&tunnel->gro_cells);
Paolo Abenie09acdd2016-02-12 15:43:55 +01001013 dst_cache_destroy(&tunnel->dst_cache);
Pravin B Shelarc5441932013-03-25 14:49:35 +00001014 free_percpu(dev->tstats);
Pravin B Shelarc5441932013-03-25 14:49:35 +00001015}
1016
1017void ip_tunnel_dellink(struct net_device *dev, struct list_head *head)
1018{
Pravin B Shelarc5441932013-03-25 14:49:35 +00001019 struct ip_tunnel *tunnel = netdev_priv(dev);
1020 struct ip_tunnel_net *itn;
1021
Nicolas Dichtel6c742e72013-08-13 17:51:11 +02001022 itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id);
Pravin B Shelarc5441932013-03-25 14:49:35 +00001023
1024 if (itn->fb_tunnel_dev != dev) {
Pravin B Shelar2e15ea32015-08-07 23:51:42 -07001025 ip_tunnel_del(itn, netdev_priv(dev));
Pravin B Shelarc5441932013-03-25 14:49:35 +00001026 unregister_netdevice_queue(dev, head);
1027 }
1028}
1029EXPORT_SYMBOL_GPL(ip_tunnel_dellink);
1030
Nicolas Dichtel1728d4f2015-01-15 15:11:17 +01001031struct net *ip_tunnel_get_link_net(const struct net_device *dev)
1032{
1033 struct ip_tunnel *tunnel = netdev_priv(dev);
1034
1035 return tunnel->net;
1036}
1037EXPORT_SYMBOL(ip_tunnel_get_link_net);
1038
Nicolas Dichtel1e995842015-04-02 17:07:02 +02001039int ip_tunnel_get_iflink(const struct net_device *dev)
1040{
1041 struct ip_tunnel *tunnel = netdev_priv(dev);
1042
1043 return tunnel->parms.link;
1044}
1045EXPORT_SYMBOL(ip_tunnel_get_iflink);
1046
Alexey Dobriyanc7d03a02016-11-17 04:58:21 +03001047int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id,
Pravin B Shelarc5441932013-03-25 14:49:35 +00001048 struct rtnl_link_ops *ops, char *devname)
1049{
1050 struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id);
1051 struct ip_tunnel_parm parms;
stephen hemminger6261d982013-08-05 22:51:37 -07001052 unsigned int i;
Pravin B Shelarc5441932013-03-25 14:49:35 +00001053
Eric Dumazet79134e62018-03-08 12:51:41 -08001054 itn->rtnl_link_ops = ops;
stephen hemminger6261d982013-08-05 22:51:37 -07001055 for (i = 0; i < IP_TNL_HASH_SIZE; i++)
1056 INIT_HLIST_HEAD(&itn->tunnels[i]);
Pravin B Shelarc5441932013-03-25 14:49:35 +00001057
Eric Dumazet79134e62018-03-08 12:51:41 -08001058 if (!ops || !net_has_fallback_tunnels(net)) {
1059 struct ip_tunnel_net *it_init_net;
1060
1061 it_init_net = net_generic(&init_net, ip_tnl_net_id);
1062 itn->type = it_init_net->type;
Pravin B Shelarc5441932013-03-25 14:49:35 +00001063 itn->fb_tunnel_dev = NULL;
1064 return 0;
1065 }
stephen hemminger6261d982013-08-05 22:51:37 -07001066
Pravin B Shelarc5441932013-03-25 14:49:35 +00001067 memset(&parms, 0, sizeof(parms));
1068 if (devname)
1069 strlcpy(parms.name, devname, IFNAMSIZ);
1070
1071 rtnl_lock();
1072 itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms);
Dan Carpenterea857f22013-08-19 10:05:10 +03001073 /* FB netdevice is special: we have one, and only one per netns.
1074 * Allowing to move it to another netns is clearly unsafe.
1075 */
Steffen Klassert67013282013-10-01 11:34:48 +02001076 if (!IS_ERR(itn->fb_tunnel_dev)) {
Dan Carpenterb4de77a2013-08-23 11:15:37 +03001077 itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
Steffen Klassert78ff4be2014-05-19 11:36:56 +02001078 itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(itn->fb_tunnel_dev);
Steffen Klassert67013282013-10-01 11:34:48 +02001079 ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev));
Eric Dumazet79134e62018-03-08 12:51:41 -08001080 itn->type = itn->fb_tunnel_dev->type;
Steffen Klassert67013282013-10-01 11:34:48 +02001081 }
Dan Carpenterb4de77a2013-08-23 11:15:37 +03001082 rtnl_unlock();
Pravin B Shelarc5441932013-03-25 14:49:35 +00001083
Sachin Kamat27d79f32014-01-27 12:13:57 +05301084 return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev);
Pravin B Shelarc5441932013-03-25 14:49:35 +00001085}
1086EXPORT_SYMBOL_GPL(ip_tunnel_init_net);
1087
Eric Dumazet79134e62018-03-08 12:51:41 -08001088static void ip_tunnel_destroy(struct net *net, struct ip_tunnel_net *itn,
1089 struct list_head *head,
Nicolas Dichtel6c742e72013-08-13 17:51:11 +02001090 struct rtnl_link_ops *ops)
Pravin B Shelarc5441932013-03-25 14:49:35 +00001091{
Nicolas Dichtel6c742e72013-08-13 17:51:11 +02001092 struct net_device *dev, *aux;
Pravin B Shelarc5441932013-03-25 14:49:35 +00001093 int h;
1094
Nicolas Dichtel6c742e72013-08-13 17:51:11 +02001095 for_each_netdev_safe(net, dev, aux)
1096 if (dev->rtnl_link_ops == ops)
1097 unregister_netdevice_queue(dev, head);
1098
Pravin B Shelarc5441932013-03-25 14:49:35 +00001099 for (h = 0; h < IP_TNL_HASH_SIZE; h++) {
1100 struct ip_tunnel *t;
1101 struct hlist_node *n;
1102 struct hlist_head *thead = &itn->tunnels[h];
1103
1104 hlist_for_each_entry_safe(t, n, thead, hash_node)
Nicolas Dichtel6c742e72013-08-13 17:51:11 +02001105 /* If dev is in the same netns, it has already
1106 * been added to the list by the previous loop.
1107 */
1108 if (!net_eq(dev_net(t->dev), net))
1109 unregister_netdevice_queue(t->dev, head);
Pravin B Shelarc5441932013-03-25 14:49:35 +00001110 }
Pravin B Shelarc5441932013-03-25 14:49:35 +00001111}
1112
Eric Dumazet64bc1782017-09-19 16:27:09 -07001113void ip_tunnel_delete_nets(struct list_head *net_list, unsigned int id,
1114 struct rtnl_link_ops *ops)
Pravin B Shelarc5441932013-03-25 14:49:35 +00001115{
Eric Dumazet64bc1782017-09-19 16:27:09 -07001116 struct ip_tunnel_net *itn;
1117 struct net *net;
Pravin B Shelarc5441932013-03-25 14:49:35 +00001118 LIST_HEAD(list);
1119
1120 rtnl_lock();
Eric Dumazet64bc1782017-09-19 16:27:09 -07001121 list_for_each_entry(net, net_list, exit_list) {
1122 itn = net_generic(net, id);
Eric Dumazet79134e62018-03-08 12:51:41 -08001123 ip_tunnel_destroy(net, itn, &list, ops);
Eric Dumazet64bc1782017-09-19 16:27:09 -07001124 }
Pravin B Shelarc5441932013-03-25 14:49:35 +00001125 unregister_netdevice_many(&list);
1126 rtnl_unlock();
Pravin B Shelarc5441932013-03-25 14:49:35 +00001127}
Eric Dumazet64bc1782017-09-19 16:27:09 -07001128EXPORT_SYMBOL_GPL(ip_tunnel_delete_nets);
Pravin B Shelarc5441932013-03-25 14:49:35 +00001129
1130int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
Craig Gallek9830ad42017-04-19 12:30:54 -04001131 struct ip_tunnel_parm *p, __u32 fwmark)
Pravin B Shelarc5441932013-03-25 14:49:35 +00001132{
1133 struct ip_tunnel *nt;
1134 struct net *net = dev_net(dev);
1135 struct ip_tunnel_net *itn;
1136 int mtu;
1137 int err;
1138
1139 nt = netdev_priv(dev);
1140 itn = net_generic(net, nt->ip_tnl_net_id);
1141
Pravin B Shelar2e15ea32015-08-07 23:51:42 -07001142 if (nt->collect_md) {
1143 if (rtnl_dereference(itn->collect_md_tun))
1144 return -EEXIST;
1145 } else {
1146 if (ip_tunnel_find(itn, p, dev->type))
1147 return -EEXIST;
1148 }
Pravin B Shelarc5441932013-03-25 14:49:35 +00001149
Nicolas Dichtel5e6700b2013-06-26 16:11:28 +02001150 nt->net = net;
Pravin B Shelarc5441932013-03-25 14:49:35 +00001151 nt->parms = *p;
Craig Gallek9830ad42017-04-19 12:30:54 -04001152 nt->fwmark = fwmark;
Pravin B Shelarc5441932013-03-25 14:49:35 +00001153 err = register_netdevice(dev);
1154 if (err)
Petr Machataf6cc9c02018-03-22 19:53:33 +02001155 goto err_register_netdevice;
Pravin B Shelarc5441932013-03-25 14:49:35 +00001156
1157 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1158 eth_hw_addr_random(dev);
1159
1160 mtu = ip_tunnel_bind_dev(dev);
Stefano Brivio24fc7972018-03-15 17:16:28 +01001161 if (tb[IFLA_MTU]) {
Nicolas Dichtel82612de2018-05-31 10:59:32 +02001162 unsigned int max = IP_MAX_MTU - dev->hard_header_len - nt->hlen;
Stefano Brivio24fc7972018-03-15 17:16:28 +01001163
David S. Miller5568cdc2018-03-29 11:42:14 -04001164 mtu = clamp(dev->mtu, (unsigned int)ETH_MIN_MTU,
1165 (unsigned int)(max - sizeof(struct iphdr)));
Petr Machataf6cc9c02018-03-22 19:53:33 +02001166 }
Pravin B Shelarc5441932013-03-25 14:49:35 +00001167
David S. Miller5568cdc2018-03-29 11:42:14 -04001168 err = dev_set_mtu(dev, mtu);
1169 if (err)
1170 goto err_dev_set_mtu;
Pravin B Shelarc5441932013-03-25 14:49:35 +00001171
1172 ip_tunnel_add(itn, nt);
Petr Machataf6cc9c02018-03-22 19:53:33 +02001173 return 0;
1174
1175err_dev_set_mtu:
1176 unregister_netdevice(dev);
1177err_register_netdevice:
Pravin B Shelarc5441932013-03-25 14:49:35 +00001178 return err;
1179}
1180EXPORT_SYMBOL_GPL(ip_tunnel_newlink);
1181
1182int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
Craig Gallek9830ad42017-04-19 12:30:54 -04001183 struct ip_tunnel_parm *p, __u32 fwmark)
Pravin B Shelarc5441932013-03-25 14:49:35 +00001184{
Nicolas Dichtel6c742e72013-08-13 17:51:11 +02001185 struct ip_tunnel *t;
Pravin B Shelarc5441932013-03-25 14:49:35 +00001186 struct ip_tunnel *tunnel = netdev_priv(dev);
Nicolas Dichtel6c742e72013-08-13 17:51:11 +02001187 struct net *net = tunnel->net;
Pravin B Shelarc5441932013-03-25 14:49:35 +00001188 struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id);
1189
1190 if (dev == itn->fb_tunnel_dev)
1191 return -EINVAL;
1192
Pravin B Shelarc5441932013-03-25 14:49:35 +00001193 t = ip_tunnel_find(itn, p, dev->type);
1194
1195 if (t) {
1196 if (t->dev != dev)
1197 return -EEXIST;
1198 } else {
Nicolas Dichtel6c742e72013-08-13 17:51:11 +02001199 t = tunnel;
Pravin B Shelarc5441932013-03-25 14:49:35 +00001200
1201 if (dev->type != ARPHRD_ETHER) {
1202 unsigned int nflags = 0;
1203
1204 if (ipv4_is_multicast(p->iph.daddr))
1205 nflags = IFF_BROADCAST;
1206 else if (p->iph.daddr)
1207 nflags = IFF_POINTOPOINT;
1208
1209 if ((dev->flags ^ nflags) &
1210 (IFF_POINTOPOINT | IFF_BROADCAST))
1211 return -EINVAL;
1212 }
1213 }
1214
Craig Gallek9830ad42017-04-19 12:30:54 -04001215 ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU], fwmark);
Pravin B Shelarc5441932013-03-25 14:49:35 +00001216 return 0;
1217}
1218EXPORT_SYMBOL_GPL(ip_tunnel_changelink);
1219
1220int ip_tunnel_init(struct net_device *dev)
1221{
1222 struct ip_tunnel *tunnel = netdev_priv(dev);
1223 struct iphdr *iph = &tunnel->parms.iph;
WANG Cong1c213bd2014-02-13 11:46:28 -08001224 int err;
Pravin B Shelarc5441932013-03-25 14:49:35 +00001225
David S. Millercf124db2017-05-08 12:52:56 -04001226 dev->needs_free_netdev = true;
1227 dev->priv_destructor = ip_tunnel_dev_free;
WANG Cong1c213bd2014-02-13 11:46:28 -08001228 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
Pravin B Shelarc5441932013-03-25 14:49:35 +00001229 if (!dev->tstats)
1230 return -ENOMEM;
1231
Paolo Abenie09acdd2016-02-12 15:43:55 +01001232 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1233 if (err) {
Tom Herbert9a4aa9a2014-01-02 11:48:33 -08001234 free_percpu(dev->tstats);
Paolo Abenie09acdd2016-02-12 15:43:55 +01001235 return err;
Tom Herbert9a4aa9a2014-01-02 11:48:33 -08001236 }
1237
Pravin B Shelarc5441932013-03-25 14:49:35 +00001238 err = gro_cells_init(&tunnel->gro_cells, dev);
1239 if (err) {
Paolo Abenie09acdd2016-02-12 15:43:55 +01001240 dst_cache_destroy(&tunnel->dst_cache);
Pravin B Shelarc5441932013-03-25 14:49:35 +00001241 free_percpu(dev->tstats);
1242 return err;
1243 }
1244
1245 tunnel->dev = dev;
Nicolas Dichtel6c742e72013-08-13 17:51:11 +02001246 tunnel->net = dev_net(dev);
Pravin B Shelarc5441932013-03-25 14:49:35 +00001247 strcpy(tunnel->parms.name, dev->name);
1248 iph->version = 4;
1249 iph->ihl = 5;
1250
William Dauchyd0f41852020-01-21 15:26:24 +01001251 if (tunnel->collect_md)
Pravin B Shelar2e15ea32015-08-07 23:51:42 -07001252 netif_keep_dst(dev);
Pravin B Shelarc5441932013-03-25 14:49:35 +00001253 return 0;
1254}
1255EXPORT_SYMBOL_GPL(ip_tunnel_init);
1256
1257void ip_tunnel_uninit(struct net_device *dev)
1258{
Pravin B Shelarc5441932013-03-25 14:49:35 +00001259 struct ip_tunnel *tunnel = netdev_priv(dev);
Nicolas Dichtel6c742e72013-08-13 17:51:11 +02001260 struct net *net = tunnel->net;
Pravin B Shelarc5441932013-03-25 14:49:35 +00001261 struct ip_tunnel_net *itn;
1262
1263 itn = net_generic(net, tunnel->ip_tnl_net_id);
Taehee Yooba615392020-06-16 16:51:51 +00001264 ip_tunnel_del(itn, netdev_priv(dev));
1265 if (itn->fb_tunnel_dev == dev)
1266 WRITE_ONCE(itn->fb_tunnel_dev, NULL);
Tom Herbert7d442fa2014-01-02 11:48:26 -08001267
Paolo Abenie09acdd2016-02-12 15:43:55 +01001268 dst_cache_reset(&tunnel->dst_cache);
Pravin B Shelarc5441932013-03-25 14:49:35 +00001269}
1270EXPORT_SYMBOL_GPL(ip_tunnel_uninit);
1271
1272/* Do least required initialization, rest of init is done in tunnel_init call */
Alexey Dobriyanc7d03a02016-11-17 04:58:21 +03001273void ip_tunnel_setup(struct net_device *dev, unsigned int net_id)
Pravin B Shelarc5441932013-03-25 14:49:35 +00001274{
1275 struct ip_tunnel *tunnel = netdev_priv(dev);
1276 tunnel->ip_tnl_net_id = net_id;
1277}
1278EXPORT_SYMBOL_GPL(ip_tunnel_setup);
1279
1280MODULE_LICENSE("GPL");