Thomas Gleixner | 2874c5f | 2019-05-27 08:55:01 +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 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 4 | * operating system. INET is implemented using the BSD Socket |
| 5 | * interface as the means of communication with the user level. |
| 6 | * |
| 7 | * Implementation of the Transmission Control Protocol(TCP). |
| 8 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * IPv4 specific functions |
| 10 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * code split from: |
| 12 | * linux/ipv4/tcp.c |
| 13 | * linux/ipv4/tcp_input.c |
| 14 | * linux/ipv4/tcp_output.c |
| 15 | * |
| 16 | * See tcp.c for author information |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
| 18 | |
| 19 | /* |
| 20 | * Changes: |
| 21 | * David S. Miller : New socket lookup architecture. |
| 22 | * This code is dedicated to John Dyson. |
| 23 | * David S. Miller : Change semantics of established hash, |
| 24 | * half is devoted to TIME_WAIT sockets |
| 25 | * and the rest go in the other half. |
| 26 | * Andi Kleen : Add support for syncookies and fixed |
| 27 | * some bugs: ip options weren't passed to |
| 28 | * the TCP layer, missed a check for an |
| 29 | * ACK bit. |
| 30 | * Andi Kleen : Implemented fast path mtu discovery. |
| 31 | * Fixed many serious bugs in the |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 32 | * request_sock handling and moved |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | * most of it into the af independent code. |
| 34 | * Added tail drop and some other bugfixes. |
Stephen Hemminger | caa20d9a | 2005-11-10 17:13:47 -0800 | [diff] [blame] | 35 | * Added new listen semantics. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | * Mike McLagan : Routing by source |
| 37 | * Juan Jose Ciarlante: ip_dynaddr bits |
| 38 | * Andi Kleen: various fixes. |
| 39 | * Vitaly E. Lavrov : Transparent proxy revived after year |
| 40 | * coma. |
| 41 | * Andi Kleen : Fix new listen. |
| 42 | * Andi Kleen : Fix accept error reporting. |
| 43 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which |
| 44 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind |
| 45 | * a single port at the same time. |
| 46 | */ |
| 47 | |
Joe Perches | afd46503 | 2012-03-12 07:03:32 +0000 | [diff] [blame] | 48 | #define pr_fmt(fmt) "TCP: " fmt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Herbert Xu | eb4dea5 | 2008-12-29 23:04:08 -0800 | [diff] [blame] | 50 | #include <linux/bottom_half.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <linux/types.h> |
| 52 | #include <linux/fcntl.h> |
| 53 | #include <linux/module.h> |
| 54 | #include <linux/random.h> |
| 55 | #include <linux/cache.h> |
| 56 | #include <linux/jhash.h> |
| 57 | #include <linux/init.h> |
| 58 | #include <linux/times.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 59 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 61 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | #include <net/icmp.h> |
Arnaldo Carvalho de Melo | 304a161 | 2005-08-09 19:59:20 -0700 | [diff] [blame] | 63 | #include <net/inet_hashtables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | #include <net/tcp.h> |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 65 | #include <net/transp_v6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #include <net/ipv6.h> |
| 67 | #include <net/inet_common.h> |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 68 | #include <net/timewait_sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | #include <net/xfrm.h> |
David S. Miller | 6e5714e | 2011-08-03 20:50:44 -0700 | [diff] [blame] | 70 | #include <net/secure_seq.h> |
Eliezer Tamir | 076bb0c | 2013-07-10 17:13:17 +0300 | [diff] [blame] | 71 | #include <net/busy_poll.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
| 73 | #include <linux/inet.h> |
| 74 | #include <linux/ipv6.h> |
| 75 | #include <linux/stddef.h> |
| 76 | #include <linux/proc_fs.h> |
| 77 | #include <linux/seq_file.h> |
Ivan Delalande | 6797318 | 2017-06-15 18:07:06 -0700 | [diff] [blame] | 78 | #include <linux/inetdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 80 | #include <crypto/hash.h> |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 81 | #include <linux/scatterlist.h> |
| 82 | |
Song Liu | c24b14c | 2017-10-23 09:20:24 -0700 | [diff] [blame] | 83 | #include <trace/events/tcp.h> |
| 84 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 85 | #ifdef CONFIG_TCP_MD5SIG |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 86 | static int tcp_v4_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 87 | __be32 daddr, __be32 saddr, const struct tcphdr *th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 88 | #endif |
| 89 | |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 90 | struct inet_hashinfo tcp_hashinfo; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 91 | EXPORT_SYMBOL(tcp_hashinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
Eric Dumazet | 84b114b | 2017-05-05 06:56:54 -0700 | [diff] [blame] | 93 | static u32 tcp_v4_init_seq(const struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | { |
Eric Dumazet | 84b114b | 2017-05-05 06:56:54 -0700 | [diff] [blame] | 95 | return secure_tcp_seq(ip_hdr(skb)->daddr, |
| 96 | ip_hdr(skb)->saddr, |
| 97 | tcp_hdr(skb)->dest, |
| 98 | tcp_hdr(skb)->source); |
| 99 | } |
| 100 | |
Eric Dumazet | 5d2ed05 | 2017-06-07 10:34:39 -0700 | [diff] [blame] | 101 | static u32 tcp_v4_init_ts_off(const struct net *net, const struct sk_buff *skb) |
Eric Dumazet | 84b114b | 2017-05-05 06:56:54 -0700 | [diff] [blame] | 102 | { |
Eric Dumazet | 5d2ed05 | 2017-06-07 10:34:39 -0700 | [diff] [blame] | 103 | return secure_tcp_ts_off(net, ip_hdr(skb)->daddr, ip_hdr(skb)->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | } |
| 105 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 106 | int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp) |
| 107 | { |
Maciej Żenczykowski | 79e9fed | 2018-06-03 10:41:17 -0700 | [diff] [blame] | 108 | const struct inet_timewait_sock *tw = inet_twsk(sktw); |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 109 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sktw); |
| 110 | struct tcp_sock *tp = tcp_sk(sk); |
Maciej Żenczykowski | 79e9fed | 2018-06-03 10:41:17 -0700 | [diff] [blame] | 111 | int reuse = sock_net(sk)->ipv4.sysctl_tcp_tw_reuse; |
| 112 | |
| 113 | if (reuse == 2) { |
| 114 | /* Still does not detect *everything* that goes through |
| 115 | * lo, since we require a loopback src or dst address |
| 116 | * or direct binding to 'lo' interface. |
| 117 | */ |
| 118 | bool loopback = false; |
| 119 | if (tw->tw_bound_dev_if == LOOPBACK_IFINDEX) |
| 120 | loopback = true; |
| 121 | #if IS_ENABLED(CONFIG_IPV6) |
| 122 | if (tw->tw_family == AF_INET6) { |
| 123 | if (ipv6_addr_loopback(&tw->tw_v6_daddr) || |
Eric Dumazet | be2644a | 2019-10-01 10:49:06 -0700 | [diff] [blame] | 124 | ipv6_addr_v4mapped_loopback(&tw->tw_v6_daddr) || |
Maciej Żenczykowski | 79e9fed | 2018-06-03 10:41:17 -0700 | [diff] [blame] | 125 | ipv6_addr_loopback(&tw->tw_v6_rcv_saddr) || |
Eric Dumazet | be2644a | 2019-10-01 10:49:06 -0700 | [diff] [blame] | 126 | ipv6_addr_v4mapped_loopback(&tw->tw_v6_rcv_saddr)) |
Maciej Żenczykowski | 79e9fed | 2018-06-03 10:41:17 -0700 | [diff] [blame] | 127 | loopback = true; |
| 128 | } else |
| 129 | #endif |
| 130 | { |
| 131 | if (ipv4_is_loopback(tw->tw_daddr) || |
| 132 | ipv4_is_loopback(tw->tw_rcv_saddr)) |
| 133 | loopback = true; |
| 134 | } |
| 135 | if (!loopback) |
| 136 | reuse = 0; |
| 137 | } |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 138 | |
| 139 | /* With PAWS, it is safe from the viewpoint |
| 140 | of data integrity. Even without PAWS it is safe provided sequence |
| 141 | spaces do not overlap i.e. at data rates <= 80Mbit/sec. |
| 142 | |
| 143 | Actually, the idea is close to VJ's one, only timestamp cache is |
| 144 | held not per host, but per port pair and TW bucket is used as state |
| 145 | holder. |
| 146 | |
| 147 | If TW bucket has been already destroyed we fall back to VJ's scheme |
| 148 | and use initial timestamp retrieved from peer table. |
| 149 | */ |
| 150 | if (tcptw->tw_ts_recent_stamp && |
Arnd Bergmann | cca9bab | 2018-07-11 12:16:12 +0200 | [diff] [blame] | 151 | (!twp || (reuse && time_after32(ktime_get_seconds(), |
| 152 | tcptw->tw_ts_recent_stamp)))) { |
Stefan Baranoff | 21684dc | 2018-07-10 17:25:20 -0400 | [diff] [blame] | 153 | /* In case of repair and re-using TIME-WAIT sockets we still |
| 154 | * want to be sure that it is safe as above but honor the |
| 155 | * sequence numbers and time stamps set as part of the repair |
| 156 | * process. |
| 157 | * |
| 158 | * Without this check re-using a TIME-WAIT socket with TCP |
| 159 | * repair would accumulate a -1 on the repair assigned |
| 160 | * sequence number. The first time it is reused the sequence |
| 161 | * is -1, the second time -2, etc. This fixes that issue |
| 162 | * without appearing to create any others. |
| 163 | */ |
| 164 | if (likely(!tp->repair)) { |
Eric Dumazet | 0f31746 | 2019-10-10 20:17:41 -0700 | [diff] [blame] | 165 | u32 seq = tcptw->tw_snd_nxt + 65535 + 2; |
| 166 | |
| 167 | if (!seq) |
| 168 | seq = 1; |
| 169 | WRITE_ONCE(tp->write_seq, seq); |
Stefan Baranoff | 21684dc | 2018-07-10 17:25:20 -0400 | [diff] [blame] | 170 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; |
| 171 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; |
| 172 | } |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 173 | sock_hold(sktw); |
| 174 | return 1; |
| 175 | } |
| 176 | |
| 177 | return 0; |
| 178 | } |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 179 | EXPORT_SYMBOL_GPL(tcp_twsk_unique); |
| 180 | |
Andrey Ignatov | d74bad4 | 2018-03-30 15:08:05 -0700 | [diff] [blame] | 181 | static int tcp_v4_pre_connect(struct sock *sk, struct sockaddr *uaddr, |
| 182 | int addr_len) |
| 183 | { |
| 184 | /* This check is replicated from tcp_v4_connect() and intended to |
| 185 | * prevent BPF program called below from accessing bytes that are out |
| 186 | * of the bound specified by user in addr_len. |
| 187 | */ |
| 188 | if (addr_len < sizeof(struct sockaddr_in)) |
| 189 | return -EINVAL; |
| 190 | |
| 191 | sock_owned_by_me(sk); |
| 192 | |
| 193 | return BPF_CGROUP_RUN_PROG_INET4_CONNECT(sk, uaddr); |
| 194 | } |
| 195 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | /* This will initiate an outgoing connection. */ |
| 197 | int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
| 198 | { |
David S. Miller | 2d7192d | 2011-04-26 13:28:44 -0700 | [diff] [blame] | 199 | struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | struct inet_sock *inet = inet_sk(sk); |
| 201 | struct tcp_sock *tp = tcp_sk(sk); |
David S. Miller | dca8b08 | 2011-02-24 13:38:12 -0800 | [diff] [blame] | 202 | __be16 orig_sport, orig_dport; |
Al Viro | bada8ad | 2006-09-26 21:27:15 -0700 | [diff] [blame] | 203 | __be32 daddr, nexthop; |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 204 | struct flowi4 *fl4; |
David S. Miller | 2d7192d | 2011-04-26 13:28:44 -0700 | [diff] [blame] | 205 | struct rtable *rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | int err; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 207 | struct ip_options_rcu *inet_opt; |
Haishuang Yan | 1946e67 | 2016-12-28 17:52:32 +0800 | [diff] [blame] | 208 | struct inet_timewait_death_row *tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | |
| 210 | if (addr_len < sizeof(struct sockaddr_in)) |
| 211 | return -EINVAL; |
| 212 | |
| 213 | if (usin->sin_family != AF_INET) |
| 214 | return -EAFNOSUPPORT; |
| 215 | |
| 216 | nexthop = daddr = usin->sin_addr.s_addr; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 217 | inet_opt = rcu_dereference_protected(inet->inet_opt, |
Hannes Frederic Sowa | 1e1d04e | 2016-04-05 17:10:15 +0200 | [diff] [blame] | 218 | lockdep_sock_is_held(sk)); |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 219 | if (inet_opt && inet_opt->opt.srr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | if (!daddr) |
| 221 | return -EINVAL; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 222 | nexthop = inet_opt->opt.faddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | } |
| 224 | |
David S. Miller | dca8b08 | 2011-02-24 13:38:12 -0800 | [diff] [blame] | 225 | orig_sport = inet->inet_sport; |
| 226 | orig_dport = usin->sin_port; |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 227 | fl4 = &inet->cork.fl.u.ip4; |
| 228 | rt = ip_route_connect(fl4, nexthop, inet->inet_saddr, |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 229 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, |
| 230 | IPPROTO_TCP, |
Steffen Klassert | 0e0d44a | 2013-08-28 08:04:14 +0200 | [diff] [blame] | 231 | orig_sport, orig_dport, sk); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 232 | if (IS_ERR(rt)) { |
| 233 | err = PTR_ERR(rt); |
| 234 | if (err == -ENETUNREACH) |
Eric Dumazet | f1d8cba | 2013-11-28 09:51:22 -0800 | [diff] [blame] | 235 | IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 236 | return err; |
Wei Dong | 584bdf8 | 2007-05-31 22:49:28 -0700 | [diff] [blame] | 237 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
| 239 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { |
| 240 | ip_rt_put(rt); |
| 241 | return -ENETUNREACH; |
| 242 | } |
| 243 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 244 | if (!inet_opt || !inet_opt->opt.srr) |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 245 | daddr = fl4->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
Eric Dumazet | c720c7e8 | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 247 | if (!inet->inet_saddr) |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 248 | inet->inet_saddr = fl4->saddr; |
Eric Dumazet | d1e559d | 2015-03-18 14:05:35 -0700 | [diff] [blame] | 249 | sk_rcv_saddr_set(sk, inet->inet_saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
Eric Dumazet | c720c7e8 | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 251 | if (tp->rx_opt.ts_recent_stamp && inet->inet_daddr != daddr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | /* Reset inherited state */ |
| 253 | tp->rx_opt.ts_recent = 0; |
| 254 | tp->rx_opt.ts_recent_stamp = 0; |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 255 | if (likely(!tp->repair)) |
Eric Dumazet | 0f31746 | 2019-10-10 20:17:41 -0700 | [diff] [blame] | 256 | WRITE_ONCE(tp->write_seq, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | } |
| 258 | |
Eric Dumazet | c720c7e8 | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 259 | inet->inet_dport = usin->sin_port; |
Eric Dumazet | d1e559d | 2015-03-18 14:05:35 -0700 | [diff] [blame] | 260 | sk_daddr_set(sk, daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 262 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 263 | if (inet_opt) |
| 264 | inet_csk(sk)->icsk_ext_hdr_len = inet_opt->opt.optlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
William Allen Simpson | bee7ca9 | 2009-11-10 09:51:18 +0000 | [diff] [blame] | 266 | tp->rx_opt.mss_clamp = TCP_MSS_DEFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
| 268 | /* Socket identity is still unknown (sport may be zero). |
| 269 | * However we set state to SYN-SENT and not releasing socket |
| 270 | * lock select source port, enter ourselves into the hash tables and |
| 271 | * complete initialization after this. |
| 272 | */ |
| 273 | tcp_set_state(sk, TCP_SYN_SENT); |
Haishuang Yan | 1946e67 | 2016-12-28 17:52:32 +0800 | [diff] [blame] | 274 | err = inet_hash_connect(tcp_death_row, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | if (err) |
| 276 | goto failure; |
| 277 | |
Tom Herbert | 877d1f6 | 2015-07-28 16:02:05 -0700 | [diff] [blame] | 278 | sk_set_txhash(sk); |
Sathya Perla | 9e7ceb0 | 2014-10-22 21:42:01 +0530 | [diff] [blame] | 279 | |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 280 | rt = ip_route_newports(fl4, rt, orig_sport, orig_dport, |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 281 | inet->inet_sport, inet->inet_dport, sk); |
| 282 | if (IS_ERR(rt)) { |
| 283 | err = PTR_ERR(rt); |
| 284 | rt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | goto failure; |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 286 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | /* OK, now commit destination to socket. */ |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 288 | sk->sk_gso_type = SKB_GSO_TCPV4; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 289 | sk_setup_caps(sk, &rt->dst); |
Wei Wang | 19f6d3f | 2017-01-23 10:59:22 -0800 | [diff] [blame] | 290 | rt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
Alexey Kodanev | 00355fa | 2017-02-22 13:23:55 +0300 | [diff] [blame] | 292 | if (likely(!tp->repair)) { |
Alexey Kodanev | 00355fa | 2017-02-22 13:23:55 +0300 | [diff] [blame] | 293 | if (!tp->write_seq) |
Eric Dumazet | 0f31746 | 2019-10-10 20:17:41 -0700 | [diff] [blame] | 294 | WRITE_ONCE(tp->write_seq, |
| 295 | secure_tcp_seq(inet->inet_saddr, |
| 296 | inet->inet_daddr, |
| 297 | inet->inet_sport, |
| 298 | usin->sin_port)); |
Eric Dumazet | 5d2ed05 | 2017-06-07 10:34:39 -0700 | [diff] [blame] | 299 | tp->tsoffset = secure_tcp_ts_off(sock_net(sk), |
| 300 | inet->inet_saddr, |
Eric Dumazet | 84b114b | 2017-05-05 06:56:54 -0700 | [diff] [blame] | 301 | inet->inet_daddr); |
Alexey Kodanev | 00355fa | 2017-02-22 13:23:55 +0300 | [diff] [blame] | 302 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | |
Eric Dumazet | a904a06 | 2019-11-01 10:32:19 -0700 | [diff] [blame] | 304 | inet->inet_id = prandom_u32(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
Wei Wang | 19f6d3f | 2017-01-23 10:59:22 -0800 | [diff] [blame] | 306 | if (tcp_fastopen_defer_connect(sk, &err)) |
| 307 | return err; |
| 308 | if (err) |
| 309 | goto failure; |
| 310 | |
Andrey Vagin | 2b91647 | 2012-11-22 01:13:58 +0000 | [diff] [blame] | 311 | err = tcp_connect(sk); |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 312 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | if (err) |
| 314 | goto failure; |
| 315 | |
| 316 | return 0; |
| 317 | |
| 318 | failure: |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 319 | /* |
| 320 | * This unhashes the socket and releases the local port, |
| 321 | * if necessary. |
| 322 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | tcp_set_state(sk, TCP_CLOSE); |
| 324 | ip_rt_put(rt); |
| 325 | sk->sk_route_caps = 0; |
Eric Dumazet | c720c7e8 | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 326 | inet->inet_dport = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | return err; |
| 328 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 329 | EXPORT_SYMBOL(tcp_v4_connect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | /* |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 332 | * This routine reacts to ICMP_FRAG_NEEDED mtu indications as defined in RFC1191. |
| 333 | * It can be called through tcp_release_cb() if socket was owned by user |
| 334 | * at the time tcp_v4_err() was called to handle ICMP message. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | */ |
Neal Cardwell | 4fab907 | 2014-08-14 12:40:05 -0400 | [diff] [blame] | 336 | void tcp_v4_mtu_reduced(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | struct inet_sock *inet = inet_sk(sk); |
Eric Dumazet | 02b2faa | 2017-03-03 14:08:21 -0800 | [diff] [blame] | 339 | struct dst_entry *dst; |
| 340 | u32 mtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | |
Eric Dumazet | 02b2faa | 2017-03-03 14:08:21 -0800 | [diff] [blame] | 342 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) |
| 343 | return; |
| 344 | mtu = tcp_sk(sk)->mtu_info; |
David S. Miller | 80d0a69 | 2012-07-16 03:28:06 -0700 | [diff] [blame] | 345 | dst = inet_csk_update_pmtu(sk, mtu); |
| 346 | if (!dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | return; |
| 348 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | /* Something is about to be wrong... Remember soft error |
| 350 | * for the case, if this connection will not able to recover. |
| 351 | */ |
| 352 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) |
| 353 | sk->sk_err_soft = EMSGSIZE; |
| 354 | |
| 355 | mtu = dst_mtu(dst); |
| 356 | |
| 357 | if (inet->pmtudisc != IP_PMTUDISC_DONT && |
Hannes Frederic Sowa | 482fc60 | 2013-11-05 02:24:17 +0100 | [diff] [blame] | 358 | ip_sk_accept_pmtu(sk) && |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 359 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | tcp_sync_mss(sk, mtu); |
| 361 | |
| 362 | /* Resend the TCP packet because it's |
| 363 | * clear that the old packet has been |
| 364 | * dropped. This is the new "fast" path mtu |
| 365 | * discovery. |
| 366 | */ |
| 367 | tcp_simple_retransmit(sk); |
| 368 | } /* else let the usual retransmit timer handle it */ |
| 369 | } |
Neal Cardwell | 4fab907 | 2014-08-14 12:40:05 -0400 | [diff] [blame] | 370 | EXPORT_SYMBOL(tcp_v4_mtu_reduced); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 372 | static void do_redirect(struct sk_buff *skb, struct sock *sk) |
| 373 | { |
| 374 | struct dst_entry *dst = __sk_dst_check(sk, 0); |
| 375 | |
David S. Miller | 1ed5c48 | 2012-07-12 00:41:25 -0700 | [diff] [blame] | 376 | if (dst) |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 377 | dst->ops->redirect(dst, sk, skb); |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 378 | } |
| 379 | |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 380 | |
| 381 | /* handle ICMP messages on TCP_NEW_SYN_RECV request sockets */ |
Eric Dumazet | 9cf7490 | 2016-02-02 19:31:12 -0800 | [diff] [blame] | 382 | void tcp_req_err(struct sock *sk, u32 seq, bool abort) |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 383 | { |
| 384 | struct request_sock *req = inet_reqsk(sk); |
| 385 | struct net *net = sock_net(sk); |
| 386 | |
| 387 | /* ICMPs are not backlogged, hence we cannot get |
| 388 | * an established socket here. |
| 389 | */ |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 390 | if (seq != tcp_rsk(req)->snt_isn) { |
Eric Dumazet | 02a1d6e | 2016-04-27 16:44:39 -0700 | [diff] [blame] | 391 | __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
Eric Dumazet | 9cf7490 | 2016-02-02 19:31:12 -0800 | [diff] [blame] | 392 | } else if (abort) { |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 393 | /* |
| 394 | * Still in SYN_RECV, just remove it silently. |
| 395 | * There is no good way to pass the error to the newly |
| 396 | * created socket, and POSIX does not want network |
| 397 | * errors returned from accept(). |
| 398 | */ |
Fan Du | c697366 | 2015-03-23 15:00:41 -0700 | [diff] [blame] | 399 | inet_csk_reqsk_queue_drop(req->rsk_listener, req); |
Eric Dumazet | 9caad86 | 2016-04-01 08:52:20 -0700 | [diff] [blame] | 400 | tcp_listendrop(req->rsk_listener); |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 401 | } |
Eric Dumazet | ef84d8c | 2015-10-14 11:16:26 -0700 | [diff] [blame] | 402 | reqsk_put(req); |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 403 | } |
| 404 | EXPORT_SYMBOL(tcp_req_err); |
| 405 | |
Eric Dumazet | f745664 | 2020-05-26 19:48:49 -0700 | [diff] [blame] | 406 | /* TCP-LD (RFC 6069) logic */ |
Eric Dumazet | d292456 | 2020-05-27 17:34:58 -0700 | [diff] [blame^] | 407 | void tcp_ld_RTO_revert(struct sock *sk, u32 seq) |
Eric Dumazet | f745664 | 2020-05-26 19:48:49 -0700 | [diff] [blame] | 408 | { |
| 409 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 410 | struct tcp_sock *tp = tcp_sk(sk); |
| 411 | struct sk_buff *skb; |
| 412 | s32 remaining; |
| 413 | u32 delta_us; |
| 414 | |
| 415 | if (sock_owned_by_user(sk)) |
| 416 | return; |
| 417 | |
| 418 | if (seq != tp->snd_una || !icsk->icsk_retransmits || |
| 419 | !icsk->icsk_backoff) |
| 420 | return; |
| 421 | |
| 422 | skb = tcp_rtx_queue_head(sk); |
| 423 | if (WARN_ON_ONCE(!skb)) |
| 424 | return; |
| 425 | |
| 426 | icsk->icsk_backoff--; |
| 427 | icsk->icsk_rto = tp->srtt_us ? __tcp_set_rto(tp) : TCP_TIMEOUT_INIT; |
| 428 | icsk->icsk_rto = inet_csk_rto_backoff(icsk, TCP_RTO_MAX); |
| 429 | |
| 430 | tcp_mstamp_refresh(tp); |
| 431 | delta_us = (u32)(tp->tcp_mstamp - tcp_skb_timestamp_us(skb)); |
| 432 | remaining = icsk->icsk_rto - usecs_to_jiffies(delta_us); |
| 433 | |
| 434 | if (remaining > 0) { |
| 435 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, |
| 436 | remaining, TCP_RTO_MAX); |
| 437 | } else { |
| 438 | /* RTO revert clocked out retransmission. |
| 439 | * Will retransmit now. |
| 440 | */ |
| 441 | tcp_retransmit_timer(sk); |
| 442 | } |
| 443 | } |
Eric Dumazet | d292456 | 2020-05-27 17:34:58 -0700 | [diff] [blame^] | 444 | EXPORT_SYMBOL(tcp_ld_RTO_revert); |
Eric Dumazet | f745664 | 2020-05-26 19:48:49 -0700 | [diff] [blame] | 445 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | /* |
| 447 | * This routine is called by the ICMP module when it gets some |
| 448 | * sort of error condition. If err < 0 then the socket should |
| 449 | * be closed and the error returned to the user. If err > 0 |
| 450 | * it's just the icmp type << 8 | icmp code. After adjustment |
| 451 | * header points to the first 8 bytes of the tcp header. We need |
| 452 | * to find the appropriate port. |
| 453 | * |
| 454 | * The locking strategy used here is very "optimistic". When |
| 455 | * someone else accesses the socket the ICMP is just dropped |
| 456 | * and for some paths there is no check at all. |
| 457 | * A more general error queue to queue errors for later handling |
| 458 | * is probably better. |
| 459 | * |
| 460 | */ |
| 461 | |
Eric Dumazet | a12daf1 | 2020-05-26 19:48:50 -0700 | [diff] [blame] | 462 | int tcp_v4_err(struct sk_buff *skb, u32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | { |
Eric Dumazet | a12daf1 | 2020-05-26 19:48:50 -0700 | [diff] [blame] | 464 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
| 465 | struct tcphdr *th = (struct tcphdr *)(skb->data + (iph->ihl << 2)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | struct tcp_sock *tp; |
| 467 | struct inet_sock *inet; |
Eric Dumazet | a12daf1 | 2020-05-26 19:48:50 -0700 | [diff] [blame] | 468 | const int type = icmp_hdr(skb)->type; |
| 469 | const int code = icmp_hdr(skb)->code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | struct sock *sk; |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 471 | struct request_sock *fastopen; |
Eric Dumazet | 9a568de | 2017-05-16 14:00:14 -0700 | [diff] [blame] | 472 | u32 seq, snd_una; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | int err; |
Eric Dumazet | a12daf1 | 2020-05-26 19:48:50 -0700 | [diff] [blame] | 474 | struct net *net = dev_net(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 476 | sk = __inet_lookup_established(net, &tcp_hashinfo, iph->daddr, |
| 477 | th->dest, iph->saddr, ntohs(th->source), |
Eric Dumazet | a12daf1 | 2020-05-26 19:48:50 -0700 | [diff] [blame] | 478 | inet_iif(skb), 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | if (!sk) { |
Eric Dumazet | 5d3848b | 2016-04-27 16:44:29 -0700 | [diff] [blame] | 480 | __ICMP_INC_STATS(net, ICMP_MIB_INERRORS); |
Stefano Brivio | 32bbd87 | 2018-11-08 12:19:21 +0100 | [diff] [blame] | 481 | return -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | } |
| 483 | if (sk->sk_state == TCP_TIME_WAIT) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 484 | inet_twsk_put(inet_twsk(sk)); |
Stefano Brivio | 32bbd87 | 2018-11-08 12:19:21 +0100 | [diff] [blame] | 485 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | } |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 487 | seq = ntohl(th->seq); |
Stefano Brivio | 32bbd87 | 2018-11-08 12:19:21 +0100 | [diff] [blame] | 488 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
| 489 | tcp_req_err(sk, seq, type == ICMP_PARAMETERPROB || |
| 490 | type == ICMP_TIME_EXCEEDED || |
| 491 | (type == ICMP_DEST_UNREACH && |
| 492 | (code == ICMP_NET_UNREACH || |
| 493 | code == ICMP_HOST_UNREACH))); |
| 494 | return 0; |
| 495 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | |
| 497 | bh_lock_sock(sk); |
| 498 | /* If too many ICMPs get dropped on busy |
| 499 | * servers this needs to be solved differently. |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 500 | * We do take care of PMTU discovery (RFC1191) special case : |
| 501 | * we can receive locally generated ICMP messages while socket is held. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | */ |
Eric Dumazet | b74aa93 | 2013-01-19 16:10:37 +0000 | [diff] [blame] | 503 | if (sock_owned_by_user(sk)) { |
| 504 | if (!(type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)) |
Eric Dumazet | 02a1d6e | 2016-04-27 16:44:39 -0700 | [diff] [blame] | 505 | __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); |
Eric Dumazet | b74aa93 | 2013-01-19 16:10:37 +0000 | [diff] [blame] | 506 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | if (sk->sk_state == TCP_CLOSE) |
| 508 | goto out; |
| 509 | |
stephen hemminger | 97e3ecd1 | 2010-03-18 11:27:32 +0000 | [diff] [blame] | 510 | if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { |
Eric Dumazet | 02a1d6e | 2016-04-27 16:44:39 -0700 | [diff] [blame] | 511 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
stephen hemminger | 97e3ecd1 | 2010-03-18 11:27:32 +0000 | [diff] [blame] | 512 | goto out; |
| 513 | } |
| 514 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | tp = tcp_sk(sk); |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 516 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
Eric Dumazet | d983ea6 | 2019-10-10 20:17:38 -0700 | [diff] [blame] | 517 | fastopen = rcu_dereference(tp->fastopen_rsk); |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 518 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | if (sk->sk_state != TCP_LISTEN && |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 520 | !between(seq, snd_una, tp->snd_nxt)) { |
Eric Dumazet | 02a1d6e | 2016-04-27 16:44:39 -0700 | [diff] [blame] | 521 | __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | goto out; |
| 523 | } |
| 524 | |
| 525 | switch (type) { |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 526 | case ICMP_REDIRECT: |
Jon Maxwell | 45caeaa | 2017-03-10 16:40:33 +1100 | [diff] [blame] | 527 | if (!sock_owned_by_user(sk)) |
Eric Dumazet | a12daf1 | 2020-05-26 19:48:50 -0700 | [diff] [blame] | 528 | do_redirect(skb, sk); |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 529 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | case ICMP_SOURCE_QUENCH: |
| 531 | /* Just silently ignore these. */ |
| 532 | goto out; |
| 533 | case ICMP_PARAMETERPROB: |
| 534 | err = EPROTO; |
| 535 | break; |
| 536 | case ICMP_DEST_UNREACH: |
| 537 | if (code > NR_ICMP_UNREACH) |
| 538 | goto out; |
| 539 | |
| 540 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ |
Eric Dumazet | 0d4f060 | 2013-03-18 07:01:28 +0000 | [diff] [blame] | 541 | /* We are not interested in TCP_LISTEN and open_requests |
| 542 | * (SYN-ACKs send out by Linux are always <576bytes so |
| 543 | * they should go through unfragmented). |
| 544 | */ |
| 545 | if (sk->sk_state == TCP_LISTEN) |
| 546 | goto out; |
| 547 | |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 548 | tp->mtu_info = info; |
Eric Dumazet | 144d56e | 2012-08-20 00:22:46 +0000 | [diff] [blame] | 549 | if (!sock_owned_by_user(sk)) { |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 550 | tcp_v4_mtu_reduced(sk); |
Eric Dumazet | 144d56e | 2012-08-20 00:22:46 +0000 | [diff] [blame] | 551 | } else { |
Eric Dumazet | 7aa5470 | 2016-12-03 11:14:57 -0800 | [diff] [blame] | 552 | if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, &sk->sk_tsq_flags)) |
Eric Dumazet | 144d56e | 2012-08-20 00:22:46 +0000 | [diff] [blame] | 553 | sock_hold(sk); |
| 554 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | goto out; |
| 556 | } |
| 557 | |
| 558 | err = icmp_err_convert[code].errno; |
Eric Dumazet | f745664 | 2020-05-26 19:48:49 -0700 | [diff] [blame] | 559 | /* check if this ICMP message allows revert of backoff. |
| 560 | * (see RFC 6069) |
| 561 | */ |
| 562 | if (!fastopen && |
| 563 | (code == ICMP_NET_UNREACH || code == ICMP_HOST_UNREACH)) |
| 564 | tcp_ld_RTO_revert(sk, seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | break; |
| 566 | case ICMP_TIME_EXCEEDED: |
| 567 | err = EHOSTUNREACH; |
| 568 | break; |
| 569 | default: |
| 570 | goto out; |
| 571 | } |
| 572 | |
| 573 | switch (sk->sk_state) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | case TCP_SYN_SENT: |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 575 | case TCP_SYN_RECV: |
| 576 | /* Only in fast or simultaneous open. If a fast open socket is |
| 577 | * is already accepted it is treated as a connected one below. |
| 578 | */ |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 579 | if (fastopen && !fastopen->sk) |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 580 | break; |
| 581 | |
Eric Dumazet | a12daf1 | 2020-05-26 19:48:50 -0700 | [diff] [blame] | 582 | ip_icmp_error(sk, skb, err, th->dest, info, (u8 *)th); |
Eric Dumazet | 45af29c | 2020-05-24 11:00:02 -0700 | [diff] [blame] | 583 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | if (!sock_owned_by_user(sk)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | sk->sk_err = err; |
| 586 | |
| 587 | sk->sk_error_report(sk); |
| 588 | |
| 589 | tcp_done(sk); |
| 590 | } else { |
| 591 | sk->sk_err_soft = err; |
| 592 | } |
| 593 | goto out; |
| 594 | } |
| 595 | |
| 596 | /* If we've already connected we will keep trying |
| 597 | * until we time out, or the user gives up. |
| 598 | * |
| 599 | * rfc1122 4.2.3.9 allows to consider as hard errors |
| 600 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, |
| 601 | * but it is obsoleted by pmtu discovery). |
| 602 | * |
| 603 | * Note, that in modern internet, where routing is unreliable |
| 604 | * and in each dark corner broken firewalls sit, sending random |
| 605 | * errors ordered by their masters even this two messages finally lose |
| 606 | * their original sense (even Linux sends invalid PORT_UNREACHs) |
| 607 | * |
| 608 | * Now we are in compliance with RFCs. |
| 609 | * --ANK (980905) |
| 610 | */ |
| 611 | |
| 612 | inet = inet_sk(sk); |
| 613 | if (!sock_owned_by_user(sk) && inet->recverr) { |
| 614 | sk->sk_err = err; |
| 615 | sk->sk_error_report(sk); |
| 616 | } else { /* Only an error on timeout */ |
| 617 | sk->sk_err_soft = err; |
| 618 | } |
| 619 | |
| 620 | out: |
| 621 | bh_unlock_sock(sk); |
| 622 | sock_put(sk); |
Stefano Brivio | 32bbd87 | 2018-11-08 12:19:21 +0100 | [diff] [blame] | 623 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | } |
| 625 | |
Daniel Borkmann | 28850dc | 2013-06-07 05:11:46 +0000 | [diff] [blame] | 626 | void __tcp_v4_send_check(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 628 | struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
Eric Dumazet | 98be9b1 | 2018-02-19 11:56:52 -0800 | [diff] [blame] | 630 | th->check = ~tcp_v4_check(skb->len, saddr, daddr, 0); |
| 631 | skb->csum_start = skb_transport_header(skb) - skb->head; |
| 632 | skb->csum_offset = offsetof(struct tcphdr, check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | } |
| 634 | |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 635 | /* This routine computes an IPv4 TCP checksum. */ |
Herbert Xu | bb29624 | 2010-04-11 02:15:55 +0000 | [diff] [blame] | 636 | void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb) |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 637 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 638 | const struct inet_sock *inet = inet_sk(sk); |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 639 | |
| 640 | __tcp_v4_send_check(skb, inet->inet_saddr, inet->inet_daddr); |
| 641 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 642 | EXPORT_SYMBOL(tcp_v4_send_check); |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 643 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | /* |
| 645 | * This routine will send an RST to the other tcp. |
| 646 | * |
| 647 | * Someone asks: why I NEVER use socket parameters (TOS, TTL etc.) |
| 648 | * for reset. |
| 649 | * Answer: if a packet caused RST, it is not for a socket |
| 650 | * existing in our system, if it is matched to a socket, |
| 651 | * it is just duplicate segment or bug in other side's TCP. |
| 652 | * So that we build reply only basing on parameters |
| 653 | * arrived with segment. |
| 654 | * Exception: precedence violation. We do not implement it in any case. |
| 655 | */ |
| 656 | |
Eric Dumazet | a00e744 | 2015-09-29 07:42:39 -0700 | [diff] [blame] | 657 | static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 659 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 660 | struct { |
| 661 | struct tcphdr th; |
| 662 | #ifdef CONFIG_TCP_MD5SIG |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 663 | __be32 opt[(TCPOLEN_MD5SIG_ALIGNED >> 2)]; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 664 | #endif |
| 665 | } rep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | struct ip_reply_arg arg; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 667 | #ifdef CONFIG_TCP_MD5SIG |
Florian Westphal | e46787f | 2015-12-21 21:29:25 +0100 | [diff] [blame] | 668 | struct tcp_md5sig_key *key = NULL; |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 669 | const __u8 *hash_location = NULL; |
| 670 | unsigned char newhash[16]; |
| 671 | int genhash; |
| 672 | struct sock *sk1 = NULL; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 673 | #endif |
Eric Dumazet | d6fb396 | 2019-06-13 21:22:35 -0700 | [diff] [blame] | 674 | u64 transmit_time = 0; |
Jon Maxwell | 0048369 | 2018-05-10 16:53:51 +1000 | [diff] [blame] | 675 | struct sock *ctl_sk; |
Eric Dumazet | d6fb396 | 2019-06-13 21:22:35 -0700 | [diff] [blame] | 676 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
| 678 | /* Never send a reset in response to a reset. */ |
| 679 | if (th->rst) |
| 680 | return; |
| 681 | |
Eric Dumazet | c3658e8 | 2014-11-25 07:40:04 -0800 | [diff] [blame] | 682 | /* If sk not NULL, it means we did a successful lookup and incoming |
| 683 | * route had to be correct. prequeue might have dropped our dst. |
| 684 | */ |
| 685 | if (!sk && skb_rtable(skb)->rt_type != RTN_LOCAL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | return; |
| 687 | |
| 688 | /* Swap the send and the receive. */ |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 689 | memset(&rep, 0, sizeof(rep)); |
| 690 | rep.th.dest = th->source; |
| 691 | rep.th.source = th->dest; |
| 692 | rep.th.doff = sizeof(struct tcphdr) / 4; |
| 693 | rep.th.rst = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | |
| 695 | if (th->ack) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 696 | rep.th.seq = th->ack_seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 698 | rep.th.ack = 1; |
| 699 | rep.th.ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin + |
| 700 | skb->len - (th->doff << 2)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | } |
| 702 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 703 | memset(&arg, 0, sizeof(arg)); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 704 | arg.iov[0].iov_base = (unsigned char *)&rep; |
| 705 | arg.iov[0].iov_len = sizeof(rep.th); |
| 706 | |
Eric Dumazet | 0f85fea | 2014-12-09 09:56:08 -0800 | [diff] [blame] | 707 | net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 708 | #ifdef CONFIG_TCP_MD5SIG |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 709 | rcu_read_lock(); |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 710 | hash_location = tcp_parse_md5sig_option(th); |
Florian Westphal | 271c3b9 | 2015-12-21 21:29:26 +0100 | [diff] [blame] | 711 | if (sk && sk_fullsock(sk)) { |
David Ahern | cea9760 | 2019-12-30 14:14:25 -0800 | [diff] [blame] | 712 | const union tcp_md5_addr *addr; |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 713 | int l3index; |
David Ahern | cea9760 | 2019-12-30 14:14:25 -0800 | [diff] [blame] | 714 | |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 715 | /* sdif set, means packet ingressed via a device |
| 716 | * in an L3 domain and inet_iif is set to it. |
| 717 | */ |
| 718 | l3index = tcp_v4_sdif(skb) ? inet_iif(skb) : 0; |
David Ahern | cea9760 | 2019-12-30 14:14:25 -0800 | [diff] [blame] | 719 | addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr; |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 720 | key = tcp_md5_do_lookup(sk, l3index, addr, AF_INET); |
Florian Westphal | e46787f | 2015-12-21 21:29:25 +0100 | [diff] [blame] | 721 | } else if (hash_location) { |
David Ahern | cea9760 | 2019-12-30 14:14:25 -0800 | [diff] [blame] | 722 | const union tcp_md5_addr *addr; |
David Ahern | 534322c | 2019-12-30 14:14:27 -0800 | [diff] [blame] | 723 | int sdif = tcp_v4_sdif(skb); |
| 724 | int dif = inet_iif(skb); |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 725 | int l3index; |
David Ahern | cea9760 | 2019-12-30 14:14:25 -0800 | [diff] [blame] | 726 | |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 727 | /* |
| 728 | * active side is lost. Try to find listening socket through |
| 729 | * source port, and then find md5 key through listening socket. |
| 730 | * we are not loose security here: |
| 731 | * Incoming packet is checked with md5 hash with finding key, |
| 732 | * no RST generated if md5 hash doesn't match. |
| 733 | */ |
Craig Gallek | a583636 | 2016-02-10 11:50:38 -0500 | [diff] [blame] | 734 | sk1 = __inet_lookup_listener(net, &tcp_hashinfo, NULL, 0, |
| 735 | ip_hdr(skb)->saddr, |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 736 | th->source, ip_hdr(skb)->daddr, |
David Ahern | 534322c | 2019-12-30 14:14:27 -0800 | [diff] [blame] | 737 | ntohs(th->source), dif, sdif); |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 738 | /* don't send rst if it can't find key */ |
| 739 | if (!sk1) |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 740 | goto out; |
| 741 | |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 742 | /* sdif set, means packet ingressed via a device |
| 743 | * in an L3 domain and dif is set to it. |
| 744 | */ |
| 745 | l3index = sdif ? dif : 0; |
David Ahern | cea9760 | 2019-12-30 14:14:25 -0800 | [diff] [blame] | 746 | addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr; |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 747 | key = tcp_md5_do_lookup(sk1, l3index, addr, AF_INET); |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 748 | if (!key) |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 749 | goto out; |
| 750 | |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 751 | |
Eric Dumazet | 39f8e58 | 2015-03-24 15:58:55 -0700 | [diff] [blame] | 752 | genhash = tcp_v4_md5_hash_skb(newhash, key, NULL, skb); |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 753 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 754 | goto out; |
| 755 | |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 756 | } |
| 757 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 758 | if (key) { |
| 759 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | |
| 760 | (TCPOPT_NOP << 16) | |
| 761 | (TCPOPT_MD5SIG << 8) | |
| 762 | TCPOLEN_MD5SIG); |
| 763 | /* Update length and the length the header thinks exists */ |
| 764 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; |
| 765 | rep.th.doff = arg.iov[0].iov_len / 4; |
| 766 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 767 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[1], |
Ilpo Järvinen | 78e645cb | 2008-10-09 14:37:47 -0700 | [diff] [blame] | 768 | key, ip_hdr(skb)->saddr, |
| 769 | ip_hdr(skb)->daddr, &rep.th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 770 | } |
| 771 | #endif |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 772 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
| 773 | ip_hdr(skb)->saddr, /* XXX */ |
Ilpo Järvinen | 52cd575 | 2008-10-08 11:34:06 -0700 | [diff] [blame] | 774 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; |
Florian Westphal | 271c3b9 | 2015-12-21 21:29:26 +0100 | [diff] [blame] | 776 | arg.flags = (sk && inet_sk_transparent(sk)) ? IP_REPLY_ARG_NOSRCCHECK : 0; |
| 777 | |
Shawn Lu | e2446ea | 2012-02-04 12:38:09 +0000 | [diff] [blame] | 778 | /* When socket is gone, all binding information is lost. |
Alexey Kuznetsov | 4c67525 | 2012-10-12 04:34:17 +0000 | [diff] [blame] | 779 | * routing might fail in this case. No choice here, if we choose to force |
| 780 | * input interface, we will misroute in case of asymmetric route. |
Shawn Lu | e2446ea | 2012-02-04 12:38:09 +0000 | [diff] [blame] | 781 | */ |
Song Liu | c24b14c | 2017-10-23 09:20:24 -0700 | [diff] [blame] | 782 | if (sk) { |
Alexey Kuznetsov | 4c67525 | 2012-10-12 04:34:17 +0000 | [diff] [blame] | 783 | arg.bound_dev_if = sk->sk_bound_dev_if; |
Song Liu | 5c487bb | 2018-02-06 20:50:23 -0800 | [diff] [blame] | 784 | if (sk_fullsock(sk)) |
| 785 | trace_tcp_send_reset(sk, skb); |
Song Liu | c24b14c | 2017-10-23 09:20:24 -0700 | [diff] [blame] | 786 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | |
Florian Westphal | 271c3b9 | 2015-12-21 21:29:26 +0100 | [diff] [blame] | 788 | BUILD_BUG_ON(offsetof(struct sock, sk_bound_dev_if) != |
| 789 | offsetof(struct inet_timewait_sock, tw_bound_dev_if)); |
| 790 | |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 791 | arg.tos = ip_hdr(skb)->tos; |
Lorenzo Colitti | e2d118a | 2016-11-04 02:23:43 +0900 | [diff] [blame] | 792 | arg.uid = sock_net_uid(net, sk && sk_fullsock(sk) ? sk : NULL); |
Eric Dumazet | 47dcc20 | 2016-05-06 09:46:18 -0700 | [diff] [blame] | 793 | local_bh_disable(); |
Eric Dumazet | 5472c3c | 2019-05-31 19:17:33 -0700 | [diff] [blame] | 794 | ctl_sk = this_cpu_read(*net->ipv4.tcp_sk); |
Eric Dumazet | a842fe1 | 2019-06-12 11:57:25 -0700 | [diff] [blame] | 795 | if (sk) { |
Jon Maxwell | 0048369 | 2018-05-10 16:53:51 +1000 | [diff] [blame] | 796 | ctl_sk->sk_mark = (sk->sk_state == TCP_TIME_WAIT) ? |
| 797 | inet_twsk(sk)->tw_mark : sk->sk_mark; |
Eric Dumazet | f6c0f5d | 2019-09-24 08:01:16 -0700 | [diff] [blame] | 798 | ctl_sk->sk_priority = (sk->sk_state == TCP_TIME_WAIT) ? |
| 799 | inet_twsk(sk)->tw_priority : sk->sk_priority; |
Eric Dumazet | d6fb396 | 2019-06-13 21:22:35 -0700 | [diff] [blame] | 800 | transmit_time = tcp_transmit_time(sk); |
Eric Dumazet | a842fe1 | 2019-06-12 11:57:25 -0700 | [diff] [blame] | 801 | } |
Jon Maxwell | 0048369 | 2018-05-10 16:53:51 +1000 | [diff] [blame] | 802 | ip_send_unicast_reply(ctl_sk, |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 803 | skb, &TCP_SKB_CB(skb)->header.h4.opt, |
Eric Dumazet | 24a2d43 | 2014-09-27 09:50:55 -0700 | [diff] [blame] | 804 | ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, |
Eric Dumazet | d6fb396 | 2019-06-13 21:22:35 -0700 | [diff] [blame] | 805 | &arg, arg.iov[0].iov_len, |
| 806 | transmit_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | |
Jon Maxwell | 0048369 | 2018-05-10 16:53:51 +1000 | [diff] [blame] | 808 | ctl_sk->sk_mark = 0; |
Eric Dumazet | 90bbcc6 | 2016-04-27 16:44:32 -0700 | [diff] [blame] | 809 | __TCP_INC_STATS(net, TCP_MIB_OUTSEGS); |
| 810 | __TCP_INC_STATS(net, TCP_MIB_OUTRSTS); |
Eric Dumazet | 47dcc20 | 2016-05-06 09:46:18 -0700 | [diff] [blame] | 811 | local_bh_enable(); |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 812 | |
| 813 | #ifdef CONFIG_TCP_MD5SIG |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 814 | out: |
| 815 | rcu_read_unlock(); |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 816 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | } |
| 818 | |
| 819 | /* The code following below sending ACKs in SYN-RECV and TIME-WAIT states |
| 820 | outside socket context is ugly, certainly. What can I do? |
| 821 | */ |
| 822 | |
Lorenzo Colitti | e2d118a | 2016-11-04 02:23:43 +0900 | [diff] [blame] | 823 | static void tcp_v4_send_ack(const struct sock *sk, |
Eric Dumazet | e62a123 | 2016-01-21 08:02:54 -0800 | [diff] [blame] | 824 | struct sk_buff *skb, u32 seq, u32 ack, |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 825 | u32 win, u32 tsval, u32 tsecr, int oif, |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 826 | struct tcp_md5sig_key *key, |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 827 | int reply_flags, u8 tos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 829 | const struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | struct { |
| 831 | struct tcphdr th; |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 832 | __be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 833 | #ifdef CONFIG_TCP_MD5SIG |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 834 | + (TCPOLEN_MD5SIG_ALIGNED >> 2) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 835 | #endif |
| 836 | ]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | } rep; |
Lorenzo Colitti | e2d118a | 2016-11-04 02:23:43 +0900 | [diff] [blame] | 838 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | struct ip_reply_arg arg; |
Jon Maxwell | 0048369 | 2018-05-10 16:53:51 +1000 | [diff] [blame] | 840 | struct sock *ctl_sk; |
Eric Dumazet | d6fb396 | 2019-06-13 21:22:35 -0700 | [diff] [blame] | 841 | u64 transmit_time; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
| 843 | memset(&rep.th, 0, sizeof(struct tcphdr)); |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 844 | memset(&arg, 0, sizeof(arg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | |
| 846 | arg.iov[0].iov_base = (unsigned char *)&rep; |
| 847 | arg.iov[0].iov_len = sizeof(rep.th); |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 848 | if (tsecr) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 849 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| 850 | (TCPOPT_TIMESTAMP << 8) | |
| 851 | TCPOLEN_TIMESTAMP); |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 852 | rep.opt[1] = htonl(tsval); |
| 853 | rep.opt[2] = htonl(tsecr); |
Craig Schlenter | cb48cfe | 2007-01-09 00:11:15 -0800 | [diff] [blame] | 854 | arg.iov[0].iov_len += TCPOLEN_TSTAMP_ALIGNED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | } |
| 856 | |
| 857 | /* Swap the send and the receive. */ |
| 858 | rep.th.dest = th->source; |
| 859 | rep.th.source = th->dest; |
| 860 | rep.th.doff = arg.iov[0].iov_len / 4; |
| 861 | rep.th.seq = htonl(seq); |
| 862 | rep.th.ack_seq = htonl(ack); |
| 863 | rep.th.ack = 1; |
| 864 | rep.th.window = htons(win); |
| 865 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 866 | #ifdef CONFIG_TCP_MD5SIG |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 867 | if (key) { |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 868 | int offset = (tsecr) ? 3 : 0; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 869 | |
| 870 | rep.opt[offset++] = htonl((TCPOPT_NOP << 24) | |
| 871 | (TCPOPT_NOP << 16) | |
| 872 | (TCPOPT_MD5SIG << 8) | |
| 873 | TCPOLEN_MD5SIG); |
| 874 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; |
| 875 | rep.th.doff = arg.iov[0].iov_len/4; |
| 876 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 877 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[offset], |
Adam Langley | 90b7e11 | 2008-07-31 20:49:48 -0700 | [diff] [blame] | 878 | key, ip_hdr(skb)->saddr, |
| 879 | ip_hdr(skb)->daddr, &rep.th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 880 | } |
| 881 | #endif |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 882 | arg.flags = reply_flags; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 883 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
| 884 | ip_hdr(skb)->saddr, /* XXX */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
| 886 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 887 | if (oif) |
| 888 | arg.bound_dev_if = oif; |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 889 | arg.tos = tos; |
Lorenzo Colitti | e2d118a | 2016-11-04 02:23:43 +0900 | [diff] [blame] | 890 | arg.uid = sock_net_uid(net, sk_fullsock(sk) ? sk : NULL); |
Eric Dumazet | 47dcc20 | 2016-05-06 09:46:18 -0700 | [diff] [blame] | 891 | local_bh_disable(); |
Eric Dumazet | 5472c3c | 2019-05-31 19:17:33 -0700 | [diff] [blame] | 892 | ctl_sk = this_cpu_read(*net->ipv4.tcp_sk); |
Eric Dumazet | a842fe1 | 2019-06-12 11:57:25 -0700 | [diff] [blame] | 893 | ctl_sk->sk_mark = (sk->sk_state == TCP_TIME_WAIT) ? |
| 894 | inet_twsk(sk)->tw_mark : sk->sk_mark; |
Eric Dumazet | f6c0f5d | 2019-09-24 08:01:16 -0700 | [diff] [blame] | 895 | ctl_sk->sk_priority = (sk->sk_state == TCP_TIME_WAIT) ? |
| 896 | inet_twsk(sk)->tw_priority : sk->sk_priority; |
Eric Dumazet | d6fb396 | 2019-06-13 21:22:35 -0700 | [diff] [blame] | 897 | transmit_time = tcp_transmit_time(sk); |
Jon Maxwell | 0048369 | 2018-05-10 16:53:51 +1000 | [diff] [blame] | 898 | ip_send_unicast_reply(ctl_sk, |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 899 | skb, &TCP_SKB_CB(skb)->header.h4.opt, |
Eric Dumazet | 24a2d43 | 2014-09-27 09:50:55 -0700 | [diff] [blame] | 900 | ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, |
Eric Dumazet | d6fb396 | 2019-06-13 21:22:35 -0700 | [diff] [blame] | 901 | &arg, arg.iov[0].iov_len, |
| 902 | transmit_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | |
Jon Maxwell | 0048369 | 2018-05-10 16:53:51 +1000 | [diff] [blame] | 904 | ctl_sk->sk_mark = 0; |
Eric Dumazet | 90bbcc6 | 2016-04-27 16:44:32 -0700 | [diff] [blame] | 905 | __TCP_INC_STATS(net, TCP_MIB_OUTSEGS); |
Eric Dumazet | 47dcc20 | 2016-05-06 09:46:18 -0700 | [diff] [blame] | 906 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | } |
| 908 | |
| 909 | static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) |
| 910 | { |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 911 | struct inet_timewait_sock *tw = inet_twsk(sk); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 912 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | |
Lorenzo Colitti | e2d118a | 2016-11-04 02:23:43 +0900 | [diff] [blame] | 914 | tcp_v4_send_ack(sk, skb, |
Eric Dumazet | e62a123 | 2016-01-21 08:02:54 -0800 | [diff] [blame] | 915 | tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 916 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
Eric Dumazet | 9a568de | 2017-05-16 14:00:14 -0700 | [diff] [blame] | 917 | tcp_time_stamp_raw() + tcptw->tw_ts_offset, |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 918 | tcptw->tw_ts_recent, |
| 919 | tw->tw_bound_dev_if, |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 920 | tcp_twsk_md5_key(tcptw), |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 921 | tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0, |
| 922 | tw->tw_tos |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 923 | ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 925 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | } |
| 927 | |
Eric Dumazet | a00e744 | 2015-09-29 07:42:39 -0700 | [diff] [blame] | 928 | static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 929 | struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | { |
David Ahern | cea9760 | 2019-12-30 14:14:25 -0800 | [diff] [blame] | 931 | const union tcp_md5_addr *addr; |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 932 | int l3index; |
David Ahern | cea9760 | 2019-12-30 14:14:25 -0800 | [diff] [blame] | 933 | |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 934 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
| 935 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. |
| 936 | */ |
Eric Dumazet | e62a123 | 2016-01-21 08:02:54 -0800 | [diff] [blame] | 937 | u32 seq = (sk->sk_state == TCP_LISTEN) ? tcp_rsk(req)->snt_isn + 1 : |
| 938 | tcp_sk(sk)->snd_nxt; |
| 939 | |
Eric Dumazet | 20a2b49 | 2016-08-22 11:31:10 -0700 | [diff] [blame] | 940 | /* RFC 7323 2.3 |
| 941 | * The window field (SEG.WND) of every outgoing segment, with the |
| 942 | * exception of <SYN> segments, MUST be right-shifted by |
| 943 | * Rcv.Wind.Shift bits: |
| 944 | */ |
David Ahern | cea9760 | 2019-12-30 14:14:25 -0800 | [diff] [blame] | 945 | addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr; |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 946 | l3index = tcp_v4_sdif(skb) ? inet_iif(skb) : 0; |
Lorenzo Colitti | e2d118a | 2016-11-04 02:23:43 +0900 | [diff] [blame] | 947 | tcp_v4_send_ack(sk, skb, seq, |
Eric Dumazet | 20a2b49 | 2016-08-22 11:31:10 -0700 | [diff] [blame] | 948 | tcp_rsk(req)->rcv_nxt, |
| 949 | req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale, |
Eric Dumazet | 9a568de | 2017-05-16 14:00:14 -0700 | [diff] [blame] | 950 | tcp_time_stamp_raw() + tcp_rsk(req)->ts_off, |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 951 | req->ts_recent, |
| 952 | 0, |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 953 | tcp_md5_do_lookup(sk, l3index, addr, AF_INET), |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 954 | inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0, |
| 955 | ip_hdr(skb)->tos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | } |
| 957 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | /* |
Kris Katterjohn | 9bf1d83 | 2008-02-17 22:29:19 -0800 | [diff] [blame] | 959 | * Send a SYN-ACK after having received a SYN. |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 960 | * This still operates on a request_sock only, not on a big |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | * socket. |
| 962 | */ |
Eric Dumazet | 0f935db | 2015-09-25 07:39:21 -0700 | [diff] [blame] | 963 | static int tcp_v4_send_synack(const struct sock *sk, struct dst_entry *dst, |
Octavian Purdila | d6274bd | 2014-06-25 17:09:58 +0300 | [diff] [blame] | 964 | struct flowi *fl, |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 965 | struct request_sock *req, |
Eric Dumazet | ca6fb06 | 2015-10-02 11:43:35 -0700 | [diff] [blame] | 966 | struct tcp_fastopen_cookie *foc, |
Eric Dumazet | b3d0514 | 2016-04-13 22:05:39 -0700 | [diff] [blame] | 967 | enum tcp_synack_type synack_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 969 | const struct inet_request_sock *ireq = inet_rsk(req); |
David S. Miller | 6bd023f | 2011-05-18 18:32:03 -0400 | [diff] [blame] | 970 | struct flowi4 fl4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | int err = -1; |
Weilong Chen | d41db5a | 2013-12-23 14:37:28 +0800 | [diff] [blame] | 972 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | |
| 974 | /* First, grab a route. */ |
David S. Miller | ba3f7f0 | 2012-07-17 14:02:46 -0700 | [diff] [blame] | 975 | if (!dst && (dst = inet_csk_route_req(sk, &fl4, req)) == NULL) |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 976 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | |
Eric Dumazet | b3d0514 | 2016-04-13 22:05:39 -0700 | [diff] [blame] | 978 | skb = tcp_make_synack(sk, dst, req, foc, synack_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | |
| 980 | if (skb) { |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 981 | __tcp_v4_send_check(skb, ireq->ir_loc_addr, ireq->ir_rmt_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | |
Eric Dumazet | 2ab2ddd | 2018-10-02 12:35:05 -0700 | [diff] [blame] | 983 | rcu_read_lock(); |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 984 | err = ip_build_and_send_pkt(skb, sk, ireq->ir_loc_addr, |
| 985 | ireq->ir_rmt_addr, |
Eric Dumazet | 2ab2ddd | 2018-10-02 12:35:05 -0700 | [diff] [blame] | 986 | rcu_dereference(ireq->ireq_opt)); |
| 987 | rcu_read_unlock(); |
Gerrit Renker | b9df3cb | 2006-11-14 11:21:36 -0200 | [diff] [blame] | 988 | err = net_xmit_eval(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | } |
| 990 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | return err; |
| 992 | } |
| 993 | |
| 994 | /* |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 995 | * IPv4 request_sock destructor. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | */ |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 997 | static void tcp_v4_reqsk_destructor(struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | { |
Eric Dumazet | c92e8c0 | 2017-10-20 09:04:13 -0700 | [diff] [blame] | 999 | kfree(rcu_dereference_protected(inet_rsk(req)->ireq_opt, 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | } |
| 1001 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1002 | #ifdef CONFIG_TCP_MD5SIG |
| 1003 | /* |
| 1004 | * RFC2385 MD5 checksumming requires a mapping of |
| 1005 | * IP address->MD5 Key. |
| 1006 | * We need to maintain these in the sk structure. |
| 1007 | */ |
| 1008 | |
Eric Dumazet | 921f9a0 | 2019-02-26 09:49:11 -0800 | [diff] [blame] | 1009 | DEFINE_STATIC_KEY_FALSE(tcp_md5_needed); |
Eric Dumazet | 6015c71 | 2018-11-27 15:03:21 -0800 | [diff] [blame] | 1010 | EXPORT_SYMBOL(tcp_md5_needed); |
| 1011 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1012 | /* Find the Key structure for an address. */ |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1013 | struct tcp_md5sig_key *__tcp_md5_do_lookup(const struct sock *sk, int l3index, |
Eric Dumazet | 6015c71 | 2018-11-27 15:03:21 -0800 | [diff] [blame] | 1014 | const union tcp_md5_addr *addr, |
| 1015 | int family) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1016 | { |
Eric Dumazet | fd3a154 | 2015-03-24 15:58:56 -0700 | [diff] [blame] | 1017 | const struct tcp_sock *tp = tcp_sk(sk); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1018 | struct tcp_md5sig_key *key; |
Eric Dumazet | fd3a154 | 2015-03-24 15:58:56 -0700 | [diff] [blame] | 1019 | const struct tcp_md5sig_info *md5sig; |
Ivan Delalande | 6797318 | 2017-06-15 18:07:06 -0700 | [diff] [blame] | 1020 | __be32 mask; |
| 1021 | struct tcp_md5sig_key *best_match = NULL; |
| 1022 | bool match; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1023 | |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1024 | /* caller either holds rcu_read_lock() or socket lock */ |
| 1025 | md5sig = rcu_dereference_check(tp->md5sig_info, |
Hannes Frederic Sowa | 1e1d04e | 2016-04-05 17:10:15 +0200 | [diff] [blame] | 1026 | lockdep_sock_is_held(sk)); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1027 | if (!md5sig) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1028 | return NULL; |
Arnd Bergmann | 083a032 | 2017-06-20 22:11:21 +0200 | [diff] [blame] | 1029 | |
Amol Grover | c8b9177 | 2020-02-21 23:27:14 +0530 | [diff] [blame] | 1030 | hlist_for_each_entry_rcu(key, &md5sig->head, node, |
| 1031 | lockdep_sock_is_held(sk)) { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1032 | if (key->family != family) |
| 1033 | continue; |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1034 | if (key->l3index && key->l3index != l3index) |
| 1035 | continue; |
Ivan Delalande | 6797318 | 2017-06-15 18:07:06 -0700 | [diff] [blame] | 1036 | if (family == AF_INET) { |
| 1037 | mask = inet_make_mask(key->prefixlen); |
| 1038 | match = (key->addr.a4.s_addr & mask) == |
| 1039 | (addr->a4.s_addr & mask); |
| 1040 | #if IS_ENABLED(CONFIG_IPV6) |
| 1041 | } else if (family == AF_INET6) { |
| 1042 | match = ipv6_prefix_equal(&key->addr.a6, &addr->a6, |
| 1043 | key->prefixlen); |
| 1044 | #endif |
| 1045 | } else { |
| 1046 | match = false; |
| 1047 | } |
| 1048 | |
| 1049 | if (match && (!best_match || |
| 1050 | key->prefixlen > best_match->prefixlen)) |
| 1051 | best_match = key; |
| 1052 | } |
| 1053 | return best_match; |
| 1054 | } |
Eric Dumazet | 6015c71 | 2018-11-27 15:03:21 -0800 | [diff] [blame] | 1055 | EXPORT_SYMBOL(__tcp_md5_do_lookup); |
Ivan Delalande | 6797318 | 2017-06-15 18:07:06 -0700 | [diff] [blame] | 1056 | |
Wu Fengguang | e8f37d5 | 2017-07-06 07:58:53 +0800 | [diff] [blame] | 1057 | static struct tcp_md5sig_key *tcp_md5_do_lookup_exact(const struct sock *sk, |
| 1058 | const union tcp_md5_addr *addr, |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1059 | int family, u8 prefixlen, |
| 1060 | int l3index) |
Ivan Delalande | 6797318 | 2017-06-15 18:07:06 -0700 | [diff] [blame] | 1061 | { |
| 1062 | const struct tcp_sock *tp = tcp_sk(sk); |
| 1063 | struct tcp_md5sig_key *key; |
| 1064 | unsigned int size = sizeof(struct in_addr); |
| 1065 | const struct tcp_md5sig_info *md5sig; |
| 1066 | |
| 1067 | /* caller either holds rcu_read_lock() or socket lock */ |
| 1068 | md5sig = rcu_dereference_check(tp->md5sig_info, |
| 1069 | lockdep_sock_is_held(sk)); |
| 1070 | if (!md5sig) |
| 1071 | return NULL; |
| 1072 | #if IS_ENABLED(CONFIG_IPV6) |
| 1073 | if (family == AF_INET6) |
| 1074 | size = sizeof(struct in6_addr); |
| 1075 | #endif |
Amol Grover | c8b9177 | 2020-02-21 23:27:14 +0530 | [diff] [blame] | 1076 | hlist_for_each_entry_rcu(key, &md5sig->head, node, |
| 1077 | lockdep_sock_is_held(sk)) { |
Ivan Delalande | 6797318 | 2017-06-15 18:07:06 -0700 | [diff] [blame] | 1078 | if (key->family != family) |
| 1079 | continue; |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1080 | if (key->l3index && key->l3index != l3index) |
| 1081 | continue; |
Ivan Delalande | 6797318 | 2017-06-15 18:07:06 -0700 | [diff] [blame] | 1082 | if (!memcmp(&key->addr, addr, size) && |
| 1083 | key->prefixlen == prefixlen) |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1084 | return key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1085 | } |
| 1086 | return NULL; |
| 1087 | } |
| 1088 | |
Eric Dumazet | b83e3de | 2015-09-25 07:39:15 -0700 | [diff] [blame] | 1089 | struct tcp_md5sig_key *tcp_v4_md5_lookup(const struct sock *sk, |
Eric Dumazet | fd3a154 | 2015-03-24 15:58:56 -0700 | [diff] [blame] | 1090 | const struct sock *addr_sk) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1091 | { |
Eric Dumazet | b52e692 | 2015-04-09 14:36:42 -0700 | [diff] [blame] | 1092 | const union tcp_md5_addr *addr; |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1093 | int l3index; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1094 | |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1095 | l3index = l3mdev_master_ifindex_by_index(sock_net(sk), |
| 1096 | addr_sk->sk_bound_dev_if); |
Eric Dumazet | b52e692 | 2015-04-09 14:36:42 -0700 | [diff] [blame] | 1097 | addr = (const union tcp_md5_addr *)&addr_sk->sk_daddr; |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1098 | return tcp_md5_do_lookup(sk, l3index, addr, AF_INET); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1099 | } |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1100 | EXPORT_SYMBOL(tcp_v4_md5_lookup); |
| 1101 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1102 | /* This can be called on a newly created socket, from other files */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1103 | int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr, |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1104 | int family, u8 prefixlen, int l3index, |
| 1105 | const u8 *newkey, u8 newkeylen, gfp_t gfp) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1106 | { |
| 1107 | /* Add Key to the list */ |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 1108 | struct tcp_md5sig_key *key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1109 | struct tcp_sock *tp = tcp_sk(sk); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1110 | struct tcp_md5sig_info *md5sig; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1111 | |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1112 | key = tcp_md5_do_lookup_exact(sk, addr, family, prefixlen, l3index); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1113 | if (key) { |
| 1114 | /* Pre-existing entry - just update that one. */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1115 | memcpy(key->key, newkey, newkeylen); |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 1116 | key->keylen = newkeylen; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1117 | return 0; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1118 | } |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1119 | |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1120 | md5sig = rcu_dereference_protected(tp->md5sig_info, |
Hannes Frederic Sowa | 1e1d04e | 2016-04-05 17:10:15 +0200 | [diff] [blame] | 1121 | lockdep_sock_is_held(sk)); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1122 | if (!md5sig) { |
| 1123 | md5sig = kmalloc(sizeof(*md5sig), gfp); |
| 1124 | if (!md5sig) |
| 1125 | return -ENOMEM; |
| 1126 | |
| 1127 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
| 1128 | INIT_HLIST_HEAD(&md5sig->head); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1129 | rcu_assign_pointer(tp->md5sig_info, md5sig); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1130 | } |
| 1131 | |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 1132 | key = sock_kmalloc(sk, sizeof(*key), gfp); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1133 | if (!key) |
| 1134 | return -ENOMEM; |
Eric Dumazet | 71cea17 | 2013-05-20 06:52:26 +0000 | [diff] [blame] | 1135 | if (!tcp_alloc_md5sig_pool()) { |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 1136 | sock_kfree_s(sk, key, sizeof(*key)); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1137 | return -ENOMEM; |
| 1138 | } |
| 1139 | |
| 1140 | memcpy(key->key, newkey, newkeylen); |
| 1141 | key->keylen = newkeylen; |
| 1142 | key->family = family; |
Ivan Delalande | 6797318 | 2017-06-15 18:07:06 -0700 | [diff] [blame] | 1143 | key->prefixlen = prefixlen; |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1144 | key->l3index = l3index; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1145 | memcpy(&key->addr, addr, |
| 1146 | (family == AF_INET6) ? sizeof(struct in6_addr) : |
| 1147 | sizeof(struct in_addr)); |
| 1148 | hlist_add_head_rcu(&key->node, &md5sig->head); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1149 | return 0; |
| 1150 | } |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1151 | EXPORT_SYMBOL(tcp_md5_do_add); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1152 | |
Ivan Delalande | 6797318 | 2017-06-15 18:07:06 -0700 | [diff] [blame] | 1153 | int tcp_md5_do_del(struct sock *sk, const union tcp_md5_addr *addr, int family, |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1154 | u8 prefixlen, int l3index) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1155 | { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1156 | struct tcp_md5sig_key *key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1157 | |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1158 | key = tcp_md5_do_lookup_exact(sk, addr, family, prefixlen, l3index); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1159 | if (!key) |
| 1160 | return -ENOENT; |
| 1161 | hlist_del_rcu(&key->node); |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 1162 | atomic_sub(sizeof(*key), &sk->sk_omem_alloc); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1163 | kfree_rcu(key, rcu); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1164 | return 0; |
| 1165 | } |
| 1166 | EXPORT_SYMBOL(tcp_md5_do_del); |
| 1167 | |
stephen hemminger | e0683e70 | 2012-10-26 14:31:40 +0000 | [diff] [blame] | 1168 | static void tcp_clear_md5_list(struct sock *sk) |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1169 | { |
| 1170 | struct tcp_sock *tp = tcp_sk(sk); |
| 1171 | struct tcp_md5sig_key *key; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1172 | struct hlist_node *n; |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1173 | struct tcp_md5sig_info *md5sig; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1174 | |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1175 | md5sig = rcu_dereference_protected(tp->md5sig_info, 1); |
| 1176 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1177 | hlist_for_each_entry_safe(key, n, &md5sig->head, node) { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1178 | hlist_del_rcu(&key->node); |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 1179 | atomic_sub(sizeof(*key), &sk->sk_omem_alloc); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1180 | kfree_rcu(key, rcu); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1181 | } |
| 1182 | } |
| 1183 | |
Ivan Delalande | 8917a77 | 2017-06-15 18:07:07 -0700 | [diff] [blame] | 1184 | static int tcp_v4_parse_md5_keys(struct sock *sk, int optname, |
| 1185 | char __user *optval, int optlen) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1186 | { |
| 1187 | struct tcp_md5sig cmd; |
| 1188 | struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr; |
David Ahern | cea9760 | 2019-12-30 14:14:25 -0800 | [diff] [blame] | 1189 | const union tcp_md5_addr *addr; |
Ivan Delalande | 8917a77 | 2017-06-15 18:07:07 -0700 | [diff] [blame] | 1190 | u8 prefixlen = 32; |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1191 | int l3index = 0; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1192 | |
| 1193 | if (optlen < sizeof(cmd)) |
| 1194 | return -EINVAL; |
| 1195 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1196 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1197 | return -EFAULT; |
| 1198 | |
| 1199 | if (sin->sin_family != AF_INET) |
| 1200 | return -EINVAL; |
| 1201 | |
Ivan Delalande | 8917a77 | 2017-06-15 18:07:07 -0700 | [diff] [blame] | 1202 | if (optname == TCP_MD5SIG_EXT && |
| 1203 | cmd.tcpm_flags & TCP_MD5SIG_FLAG_PREFIX) { |
| 1204 | prefixlen = cmd.tcpm_prefixlen; |
| 1205 | if (prefixlen > 32) |
| 1206 | return -EINVAL; |
| 1207 | } |
| 1208 | |
David Ahern | 6b102db | 2019-12-30 14:14:29 -0800 | [diff] [blame] | 1209 | if (optname == TCP_MD5SIG_EXT && |
| 1210 | cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX) { |
| 1211 | struct net_device *dev; |
| 1212 | |
| 1213 | rcu_read_lock(); |
| 1214 | dev = dev_get_by_index_rcu(sock_net(sk), cmd.tcpm_ifindex); |
| 1215 | if (dev && netif_is_l3_master(dev)) |
| 1216 | l3index = dev->ifindex; |
| 1217 | |
| 1218 | rcu_read_unlock(); |
| 1219 | |
| 1220 | /* ok to reference set/not set outside of rcu; |
| 1221 | * right now device MUST be an L3 master |
| 1222 | */ |
| 1223 | if (!dev || !l3index) |
| 1224 | return -EINVAL; |
| 1225 | } |
| 1226 | |
David Ahern | cea9760 | 2019-12-30 14:14:25 -0800 | [diff] [blame] | 1227 | addr = (union tcp_md5_addr *)&sin->sin_addr.s_addr; |
| 1228 | |
Dmitry Popov | 64a124e | 2014-08-03 22:45:19 +0400 | [diff] [blame] | 1229 | if (!cmd.tcpm_keylen) |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1230 | return tcp_md5_do_del(sk, addr, AF_INET, prefixlen, l3index); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1231 | |
| 1232 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) |
| 1233 | return -EINVAL; |
| 1234 | |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1235 | return tcp_md5_do_add(sk, addr, AF_INET, prefixlen, l3index, |
David Ahern | cea9760 | 2019-12-30 14:14:25 -0800 | [diff] [blame] | 1236 | cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1237 | } |
| 1238 | |
Eric Dumazet | 19689e3 | 2016-06-27 18:51:53 +0200 | [diff] [blame] | 1239 | static int tcp_v4_md5_hash_headers(struct tcp_md5sig_pool *hp, |
| 1240 | __be32 daddr, __be32 saddr, |
| 1241 | const struct tcphdr *th, int nbytes) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1242 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1243 | struct tcp4_pseudohdr *bp; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1244 | struct scatterlist sg; |
Eric Dumazet | 19689e3 | 2016-06-27 18:51:53 +0200 | [diff] [blame] | 1245 | struct tcphdr *_th; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1246 | |
Eric Dumazet | 19689e3 | 2016-06-27 18:51:53 +0200 | [diff] [blame] | 1247 | bp = hp->scratch; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1248 | bp->saddr = saddr; |
| 1249 | bp->daddr = daddr; |
| 1250 | bp->pad = 0; |
YOSHIFUJI Hideaki | 076fb72 | 2008-04-17 12:48:12 +0900 | [diff] [blame] | 1251 | bp->protocol = IPPROTO_TCP; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1252 | bp->len = cpu_to_be16(nbytes); |
David S. Miller | c7da57a | 2007-10-26 00:41:21 -0700 | [diff] [blame] | 1253 | |
Eric Dumazet | 19689e3 | 2016-06-27 18:51:53 +0200 | [diff] [blame] | 1254 | _th = (struct tcphdr *)(bp + 1); |
| 1255 | memcpy(_th, th, sizeof(*th)); |
| 1256 | _th->check = 0; |
| 1257 | |
| 1258 | sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th)); |
| 1259 | ahash_request_set_crypt(hp->md5_req, &sg, NULL, |
| 1260 | sizeof(*bp) + sizeof(*th)); |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1261 | return crypto_ahash_update(hp->md5_req); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1262 | } |
| 1263 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1264 | static int tcp_v4_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 1265 | __be32 daddr, __be32 saddr, const struct tcphdr *th) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1266 | { |
| 1267 | struct tcp_md5sig_pool *hp; |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1268 | struct ahash_request *req; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1269 | |
| 1270 | hp = tcp_get_md5sig_pool(); |
| 1271 | if (!hp) |
| 1272 | goto clear_hash_noput; |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1273 | req = hp->md5_req; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1274 | |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1275 | if (crypto_ahash_init(req)) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1276 | goto clear_hash; |
Eric Dumazet | 19689e3 | 2016-06-27 18:51:53 +0200 | [diff] [blame] | 1277 | if (tcp_v4_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2)) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1278 | goto clear_hash; |
| 1279 | if (tcp_md5_hash_key(hp, key)) |
| 1280 | goto clear_hash; |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1281 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
| 1282 | if (crypto_ahash_final(req)) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1283 | goto clear_hash; |
| 1284 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1285 | tcp_put_md5sig_pool(); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1286 | return 0; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1287 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1288 | clear_hash: |
| 1289 | tcp_put_md5sig_pool(); |
| 1290 | clear_hash_noput: |
| 1291 | memset(md5_hash, 0, 16); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1292 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1293 | } |
| 1294 | |
Eric Dumazet | 39f8e58 | 2015-03-24 15:58:55 -0700 | [diff] [blame] | 1295 | int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key, |
| 1296 | const struct sock *sk, |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 1297 | const struct sk_buff *skb) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1298 | { |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1299 | struct tcp_md5sig_pool *hp; |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1300 | struct ahash_request *req; |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 1301 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1302 | __be32 saddr, daddr; |
| 1303 | |
Eric Dumazet | 39f8e58 | 2015-03-24 15:58:55 -0700 | [diff] [blame] | 1304 | if (sk) { /* valid for establish/request sockets */ |
| 1305 | saddr = sk->sk_rcv_saddr; |
| 1306 | daddr = sk->sk_daddr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1307 | } else { |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1308 | const struct iphdr *iph = ip_hdr(skb); |
| 1309 | saddr = iph->saddr; |
| 1310 | daddr = iph->daddr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1311 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1312 | |
| 1313 | hp = tcp_get_md5sig_pool(); |
| 1314 | if (!hp) |
| 1315 | goto clear_hash_noput; |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1316 | req = hp->md5_req; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1317 | |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1318 | if (crypto_ahash_init(req)) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1319 | goto clear_hash; |
| 1320 | |
Eric Dumazet | 19689e3 | 2016-06-27 18:51:53 +0200 | [diff] [blame] | 1321 | if (tcp_v4_md5_hash_headers(hp, daddr, saddr, th, skb->len)) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1322 | goto clear_hash; |
| 1323 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) |
| 1324 | goto clear_hash; |
| 1325 | if (tcp_md5_hash_key(hp, key)) |
| 1326 | goto clear_hash; |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1327 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
| 1328 | if (crypto_ahash_final(req)) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1329 | goto clear_hash; |
| 1330 | |
| 1331 | tcp_put_md5sig_pool(); |
| 1332 | return 0; |
| 1333 | |
| 1334 | clear_hash: |
| 1335 | tcp_put_md5sig_pool(); |
| 1336 | clear_hash_noput: |
| 1337 | memset(md5_hash, 0, 16); |
| 1338 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1339 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1340 | EXPORT_SYMBOL(tcp_v4_md5_hash_skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1341 | |
Eric Dumazet | ba8e275 | 2015-10-02 11:43:28 -0700 | [diff] [blame] | 1342 | #endif |
| 1343 | |
Eric Dumazet | ff74e23 | 2015-03-24 15:58:54 -0700 | [diff] [blame] | 1344 | /* Called with rcu_read_lock() */ |
Eric Dumazet | ba8e275 | 2015-10-02 11:43:28 -0700 | [diff] [blame] | 1345 | static bool tcp_v4_inbound_md5_hash(const struct sock *sk, |
David Ahern | 534322c | 2019-12-30 14:14:27 -0800 | [diff] [blame] | 1346 | const struct sk_buff *skb, |
| 1347 | int dif, int sdif) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1348 | { |
Eric Dumazet | ba8e275 | 2015-10-02 11:43:28 -0700 | [diff] [blame] | 1349 | #ifdef CONFIG_TCP_MD5SIG |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1350 | /* |
| 1351 | * This gets called for each TCP segment that arrives |
| 1352 | * so we want to be efficient. |
| 1353 | * We have 3 drop cases: |
| 1354 | * o No MD5 hash and one expected. |
| 1355 | * o MD5 hash and we're not expecting one. |
| 1356 | * o MD5 hash and its wrong. |
| 1357 | */ |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1358 | const __u8 *hash_location = NULL; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1359 | struct tcp_md5sig_key *hash_expected; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1360 | const struct iphdr *iph = ip_hdr(skb); |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1361 | const struct tcphdr *th = tcp_hdr(skb); |
David Ahern | cea9760 | 2019-12-30 14:14:25 -0800 | [diff] [blame] | 1362 | const union tcp_md5_addr *addr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1363 | unsigned char newhash[16]; |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1364 | int genhash, l3index; |
| 1365 | |
| 1366 | /* sdif set, means packet ingressed via a device |
| 1367 | * in an L3 domain and dif is set to the l3mdev |
| 1368 | */ |
| 1369 | l3index = sdif ? dif : 0; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1370 | |
David Ahern | cea9760 | 2019-12-30 14:14:25 -0800 | [diff] [blame] | 1371 | addr = (union tcp_md5_addr *)&iph->saddr; |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1372 | hash_expected = tcp_md5_do_lookup(sk, l3index, addr, AF_INET); |
YOSHIFUJI Hideaki | 7d5d552 | 2008-04-17 12:29:53 +0900 | [diff] [blame] | 1373 | hash_location = tcp_parse_md5sig_option(th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1374 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1375 | /* We've parsed the options - do we have a hash? */ |
| 1376 | if (!hash_expected && !hash_location) |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1377 | return false; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1378 | |
| 1379 | if (hash_expected && !hash_location) { |
Eric Dumazet | c10d931 | 2016-04-29 14:16:47 -0700 | [diff] [blame] | 1380 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1381 | return true; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1382 | } |
| 1383 | |
| 1384 | if (!hash_expected && hash_location) { |
Eric Dumazet | c10d931 | 2016-04-29 14:16:47 -0700 | [diff] [blame] | 1385 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1386 | return true; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1387 | } |
| 1388 | |
| 1389 | /* Okay, so this is hash_expected and hash_location - |
| 1390 | * so we need to calculate the checksum. |
| 1391 | */ |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1392 | genhash = tcp_v4_md5_hash_skb(newhash, |
| 1393 | hash_expected, |
Eric Dumazet | 39f8e58 | 2015-03-24 15:58:55 -0700 | [diff] [blame] | 1394 | NULL, skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1395 | |
| 1396 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
Eric Dumazet | 72145a6 | 2016-08-24 09:01:23 -0700 | [diff] [blame] | 1397 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE); |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1398 | net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s L3 index %d\n", |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1399 | &iph->saddr, ntohs(th->source), |
| 1400 | &iph->daddr, ntohs(th->dest), |
| 1401 | genhash ? " tcp_v4_calc_md5_hash failed" |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1402 | : "", l3index); |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1403 | return true; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1404 | } |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1405 | return false; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1406 | #endif |
Eric Dumazet | ba8e275 | 2015-10-02 11:43:28 -0700 | [diff] [blame] | 1407 | return false; |
| 1408 | } |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1409 | |
Eric Dumazet | b40cf18 | 2015-09-25 07:39:08 -0700 | [diff] [blame] | 1410 | static void tcp_v4_init_req(struct request_sock *req, |
| 1411 | const struct sock *sk_listener, |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 1412 | struct sk_buff *skb) |
| 1413 | { |
| 1414 | struct inet_request_sock *ireq = inet_rsk(req); |
Eric Dumazet | c92e8c0 | 2017-10-20 09:04:13 -0700 | [diff] [blame] | 1415 | struct net *net = sock_net(sk_listener); |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 1416 | |
Eric Dumazet | 08d2cc3b | 2015-03-18 14:05:38 -0700 | [diff] [blame] | 1417 | sk_rcv_saddr_set(req_to_sk(req), ip_hdr(skb)->daddr); |
| 1418 | sk_daddr_set(req_to_sk(req), ip_hdr(skb)->saddr); |
Eric Dumazet | c92e8c0 | 2017-10-20 09:04:13 -0700 | [diff] [blame] | 1419 | RCU_INIT_POINTER(ireq->ireq_opt, tcp_v4_save_options(net, skb)); |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 1420 | } |
| 1421 | |
Eric Dumazet | f964629 | 2015-09-29 07:42:50 -0700 | [diff] [blame] | 1422 | static struct dst_entry *tcp_v4_route_req(const struct sock *sk, |
| 1423 | struct flowi *fl, |
Soheil Hassas Yeganeh | 4396e46 | 2017-03-15 16:30:46 -0400 | [diff] [blame] | 1424 | const struct request_sock *req) |
Octavian Purdila | d94e041 | 2014-06-25 17:09:55 +0300 | [diff] [blame] | 1425 | { |
Soheil Hassas Yeganeh | 4396e46 | 2017-03-15 16:30:46 -0400 | [diff] [blame] | 1426 | return inet_csk_route_req(sk, &fl->u.ip4, req); |
Octavian Purdila | d94e041 | 2014-06-25 17:09:55 +0300 | [diff] [blame] | 1427 | } |
| 1428 | |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 1429 | struct request_sock_ops tcp_request_sock_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | .family = PF_INET, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1431 | .obj_size = sizeof(struct tcp_request_sock), |
Octavian Purdila | 5db92c9 | 2014-06-25 17:09:59 +0300 | [diff] [blame] | 1432 | .rtx_syn_ack = tcp_rtx_synack, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1433 | .send_ack = tcp_v4_reqsk_send_ack, |
| 1434 | .destructor = tcp_v4_reqsk_destructor, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | .send_reset = tcp_v4_send_reset, |
stephen hemminger | 688d194 | 2014-08-29 23:32:05 -0700 | [diff] [blame] | 1436 | .syn_ack_timeout = tcp_syn_ack_timeout, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | }; |
| 1438 | |
Mat Martineau | 35b2c32 | 2020-01-09 07:59:21 -0800 | [diff] [blame] | 1439 | const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = { |
Octavian Purdila | 2aec4a2 | 2014-06-25 17:10:00 +0300 | [diff] [blame] | 1440 | .mss_clamp = TCP_MSS_DEFAULT, |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 1441 | #ifdef CONFIG_TCP_MD5SIG |
Eric Dumazet | fd3a154 | 2015-03-24 15:58:56 -0700 | [diff] [blame] | 1442 | .req_md5_lookup = tcp_v4_md5_lookup, |
John Dykstra | e3afe7b | 2009-07-16 05:04:51 +0000 | [diff] [blame] | 1443 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 1444 | #endif |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 1445 | .init_req = tcp_v4_init_req, |
Octavian Purdila | fb7b37a | 2014-06-25 17:09:54 +0300 | [diff] [blame] | 1446 | #ifdef CONFIG_SYN_COOKIES |
| 1447 | .cookie_init_seq = cookie_v4_init_sequence, |
| 1448 | #endif |
Octavian Purdila | d94e041 | 2014-06-25 17:09:55 +0300 | [diff] [blame] | 1449 | .route_req = tcp_v4_route_req, |
Eric Dumazet | 84b114b | 2017-05-05 06:56:54 -0700 | [diff] [blame] | 1450 | .init_seq = tcp_v4_init_seq, |
| 1451 | .init_ts_off = tcp_v4_init_ts_off, |
Octavian Purdila | d6274bd | 2014-06-25 17:09:58 +0300 | [diff] [blame] | 1452 | .send_synack = tcp_v4_send_synack, |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 1453 | }; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1454 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) |
| 1456 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | /* Never answer to SYNs send to broadcast or multicast */ |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 1458 | if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | goto drop; |
| 1460 | |
Octavian Purdila | 1fb6f15 | 2014-06-25 17:10:02 +0300 | [diff] [blame] | 1461 | return tcp_conn_request(&tcp_request_sock_ops, |
| 1462 | &tcp_request_sock_ipv4_ops, sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1464 | drop: |
Eric Dumazet | 9caad86 | 2016-04-01 08:52:20 -0700 | [diff] [blame] | 1465 | tcp_listendrop(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | return 0; |
| 1467 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1468 | EXPORT_SYMBOL(tcp_v4_conn_request); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | |
| 1470 | |
| 1471 | /* |
| 1472 | * The three way handshake has completed - we got a valid synack - |
| 1473 | * now create the new socket. |
| 1474 | */ |
Eric Dumazet | 0c27171 | 2015-09-29 07:42:48 -0700 | [diff] [blame] | 1475 | struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1476 | struct request_sock *req, |
Eric Dumazet | 5e0724d | 2015-10-22 08:20:46 -0700 | [diff] [blame] | 1477 | struct dst_entry *dst, |
| 1478 | struct request_sock *req_unhash, |
| 1479 | bool *own_req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1481 | struct inet_request_sock *ireq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | struct inet_sock *newinet; |
| 1483 | struct tcp_sock *newtp; |
| 1484 | struct sock *newsk; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1485 | #ifdef CONFIG_TCP_MD5SIG |
David Ahern | cea9760 | 2019-12-30 14:14:25 -0800 | [diff] [blame] | 1486 | const union tcp_md5_addr *addr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1487 | struct tcp_md5sig_key *key; |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1488 | int l3index; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1489 | #endif |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1490 | struct ip_options_rcu *inet_opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | |
| 1492 | if (sk_acceptq_is_full(sk)) |
| 1493 | goto exit_overflow; |
| 1494 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | newsk = tcp_create_openreq_child(sk, req, skb); |
| 1496 | if (!newsk) |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1497 | goto exit_nonewsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 1499 | newsk->sk_gso_type = SKB_GSO_TCPV4; |
Neal Cardwell | fae6ef8 | 2012-08-19 03:30:38 +0000 | [diff] [blame] | 1500 | inet_sk_rx_dst_set(newsk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | |
| 1502 | newtp = tcp_sk(newsk); |
| 1503 | newinet = inet_sk(newsk); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1504 | ireq = inet_rsk(req); |
Eric Dumazet | d1e559d | 2015-03-18 14:05:35 -0700 | [diff] [blame] | 1505 | sk_daddr_set(newsk, ireq->ir_rmt_addr); |
| 1506 | sk_rcv_saddr_set(newsk, ireq->ir_loc_addr); |
David Ahern | 6dd9a14 | 2015-12-16 13:20:44 -0800 | [diff] [blame] | 1507 | newsk->sk_bound_dev_if = ireq->ir_iif; |
Eric Dumazet | c92e8c0 | 2017-10-20 09:04:13 -0700 | [diff] [blame] | 1508 | newinet->inet_saddr = ireq->ir_loc_addr; |
| 1509 | inet_opt = rcu_dereference(ireq->ireq_opt); |
| 1510 | RCU_INIT_POINTER(newinet->inet_opt, inet_opt); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1511 | newinet->mc_index = inet_iif(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1512 | newinet->mc_ttl = ip_hdr(skb)->ttl; |
Jiri Benc | 4c507d2 | 2012-02-09 09:35:49 +0000 | [diff] [blame] | 1513 | newinet->rcv_tos = ip_hdr(skb)->tos; |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1514 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1515 | if (inet_opt) |
| 1516 | inet_csk(newsk)->icsk_ext_hdr_len = inet_opt->opt.optlen; |
Eric Dumazet | a904a06 | 2019-11-01 10:32:19 -0700 | [diff] [blame] | 1517 | newinet->inet_id = prandom_u32(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1518 | |
Eric Dumazet | dfd25ff | 2012-03-10 09:20:21 +0000 | [diff] [blame] | 1519 | if (!dst) { |
| 1520 | dst = inet_csk_route_child_sock(sk, newsk, req); |
| 1521 | if (!dst) |
| 1522 | goto put_and_exit; |
| 1523 | } else { |
| 1524 | /* syncookie case : see end of cookie_v4_check() */ |
| 1525 | } |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1526 | sk_setup_caps(newsk, dst); |
| 1527 | |
Daniel Borkmann | 8116441 | 2015-01-05 23:57:48 +0100 | [diff] [blame] | 1528 | tcp_ca_openreq_child(newsk, dst); |
| 1529 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | tcp_sync_mss(newsk, dst_mtu(dst)); |
Eric Dumazet | 3541f9e | 2017-02-02 08:04:56 -0800 | [diff] [blame] | 1531 | newtp->advmss = tcp_mss_clamp(tcp_sk(sk), dst_metric_advmss(dst)); |
Tom Quetchenbach | f5fff5d | 2008-09-21 00:21:51 -0700 | [diff] [blame] | 1532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | tcp_initialize_rcv_mss(newsk); |
| 1534 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1535 | #ifdef CONFIG_TCP_MD5SIG |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1536 | l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1537 | /* Copy over the MD5 key from the original socket */ |
David Ahern | cea9760 | 2019-12-30 14:14:25 -0800 | [diff] [blame] | 1538 | addr = (union tcp_md5_addr *)&newinet->inet_daddr; |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1539 | key = tcp_md5_do_lookup(sk, l3index, addr, AF_INET); |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 1540 | if (key) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1541 | /* |
| 1542 | * We're using one, so create a matching key |
| 1543 | * on the newsk structure. If we fail to get |
| 1544 | * memory, then we end up not copying the key |
| 1545 | * across. Shucks. |
| 1546 | */ |
David Ahern | dea53bb | 2019-12-30 14:14:28 -0800 | [diff] [blame] | 1547 | tcp_md5_do_add(newsk, addr, AF_INET, 32, l3index, |
David Ahern | cea9760 | 2019-12-30 14:14:25 -0800 | [diff] [blame] | 1548 | key->key, key->keylen, GFP_ATOMIC); |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 1549 | sk_nocaps_add(newsk, NETIF_F_GSO_MASK); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1550 | } |
| 1551 | #endif |
| 1552 | |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1553 | if (__inet_inherit_port(sk, newsk) < 0) |
| 1554 | goto put_and_exit; |
Eric Dumazet | 5e0724d | 2015-10-22 08:20:46 -0700 | [diff] [blame] | 1555 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); |
Eric Dumazet | c92e8c0 | 2017-10-20 09:04:13 -0700 | [diff] [blame] | 1556 | if (likely(*own_req)) { |
Eric Dumazet | 49a496c | 2015-11-05 12:50:19 -0800 | [diff] [blame] | 1557 | tcp_move_syn(newtp, req); |
Eric Dumazet | c92e8c0 | 2017-10-20 09:04:13 -0700 | [diff] [blame] | 1558 | ireq->ireq_opt = NULL; |
| 1559 | } else { |
| 1560 | newinet->inet_opt = NULL; |
| 1561 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | return newsk; |
| 1563 | |
| 1564 | exit_overflow: |
Eric Dumazet | c10d931 | 2016-04-29 14:16:47 -0700 | [diff] [blame] | 1565 | NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1566 | exit_nonewsk: |
| 1567 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | exit: |
Eric Dumazet | 9caad86 | 2016-04-01 08:52:20 -0700 | [diff] [blame] | 1569 | tcp_listendrop(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | return NULL; |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1571 | put_and_exit: |
Eric Dumazet | c92e8c0 | 2017-10-20 09:04:13 -0700 | [diff] [blame] | 1572 | newinet->inet_opt = NULL; |
Christoph Paasch | e337e24 | 2012-12-14 04:07:58 +0000 | [diff] [blame] | 1573 | inet_csk_prepare_forced_close(newsk); |
| 1574 | tcp_done(newsk); |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1575 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1577 | EXPORT_SYMBOL(tcp_v4_syn_recv_sock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1579 | static struct sock *tcp_v4_cookie_check(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1581 | #ifdef CONFIG_SYN_COOKIES |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1582 | const struct tcphdr *th = tcp_hdr(skb); |
| 1583 | |
Florian Westphal | af9b473 | 2010-06-03 00:43:44 +0000 | [diff] [blame] | 1584 | if (!th->syn) |
Cong Wang | 461b74c | 2014-10-15 14:33:22 -0700 | [diff] [blame] | 1585 | sk = cookie_v4_check(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1586 | #endif |
| 1587 | return sk; |
| 1588 | } |
| 1589 | |
Petar Penkov | 9349d60 | 2019-07-29 09:59:14 -0700 | [diff] [blame] | 1590 | u16 tcp_v4_get_syncookie(struct sock *sk, struct iphdr *iph, |
| 1591 | struct tcphdr *th, u32 *cookie) |
| 1592 | { |
| 1593 | u16 mss = 0; |
| 1594 | #ifdef CONFIG_SYN_COOKIES |
| 1595 | mss = tcp_get_syncookie_mss(&tcp_request_sock_ops, |
| 1596 | &tcp_request_sock_ipv4_ops, sk, th); |
| 1597 | if (mss) { |
| 1598 | *cookie = __cookie_v4_init_sequence(iph, th, &mss); |
| 1599 | tcp_synq_overflow(sk); |
| 1600 | } |
| 1601 | #endif |
| 1602 | return mss; |
| 1603 | } |
| 1604 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | /* The socket must have it's spinlock held when we get |
Eric Dumazet | e994b2f | 2015-10-02 11:43:39 -0700 | [diff] [blame] | 1606 | * here, unless it is a TCP_LISTEN socket. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1607 | * |
| 1608 | * We have a potential double-lock case here, so even when |
| 1609 | * doing backlog processing we use the BH locking scheme. |
| 1610 | * This is because we cannot sleep with the original spinlock |
| 1611 | * held. |
| 1612 | */ |
| 1613 | int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) |
| 1614 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1615 | struct sock *rsk; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1616 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1617 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
Eric Dumazet | 404e0a8 | 2012-07-29 23:20:37 +0000 | [diff] [blame] | 1618 | struct dst_entry *dst = sk->sk_rx_dst; |
| 1619 | |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1620 | sock_rps_save_rxhash(sk, skb); |
Eric Dumazet | 3d97379 | 2014-11-11 05:54:27 -0800 | [diff] [blame] | 1621 | sk_mark_napi_id(sk, skb); |
Eric Dumazet | 404e0a8 | 2012-07-29 23:20:37 +0000 | [diff] [blame] | 1622 | if (dst) { |
Eric Dumazet | 505fbcf | 2012-07-27 06:23:40 +0000 | [diff] [blame] | 1623 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1624 | !dst->ops->check(dst, 0)) { |
David S. Miller | 92101b3 | 2012-07-23 16:29:00 -0700 | [diff] [blame] | 1625 | dst_release(dst); |
| 1626 | sk->sk_rx_dst = NULL; |
| 1627 | } |
| 1628 | } |
Yafang Shao | 3d97d88 | 2018-05-29 23:27:31 +0800 | [diff] [blame] | 1629 | tcp_rcv_established(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | return 0; |
| 1631 | } |
| 1632 | |
Eric Dumazet | 12e25e1 | 2015-06-03 23:49:21 -0700 | [diff] [blame] | 1633 | if (tcp_checksum_complete(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | goto csum_err; |
| 1635 | |
| 1636 | if (sk->sk_state == TCP_LISTEN) { |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1637 | struct sock *nsk = tcp_v4_cookie_check(sk, skb); |
| 1638 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1639 | if (!nsk) |
| 1640 | goto discard; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | if (nsk != sk) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1642 | if (tcp_child_process(sk, nsk, skb)) { |
| 1643 | rsk = nsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | goto reset; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1645 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | return 0; |
| 1647 | } |
Eric Dumazet | ca55158 | 2010-06-03 09:03:58 +0000 | [diff] [blame] | 1648 | } else |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1649 | sock_rps_save_rxhash(sk, skb); |
Eric Dumazet | ca55158 | 2010-06-03 09:03:58 +0000 | [diff] [blame] | 1650 | |
Eric Dumazet | 72ab4a8 | 2015-09-29 07:42:41 -0700 | [diff] [blame] | 1651 | if (tcp_rcv_state_process(sk, skb)) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1652 | rsk = sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | goto reset; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1654 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | return 0; |
| 1656 | |
| 1657 | reset: |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1658 | tcp_v4_send_reset(rsk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | discard: |
| 1660 | kfree_skb(skb); |
| 1661 | /* Be careful here. If this function gets more complicated and |
| 1662 | * gcc suffers from register pressure on the x86, sk (in %ebx) |
| 1663 | * might be destroyed here. This current version compiles correctly, |
| 1664 | * but you have been warned. |
| 1665 | */ |
| 1666 | return 0; |
| 1667 | |
| 1668 | csum_err: |
Eric Dumazet | c10d931 | 2016-04-29 14:16:47 -0700 | [diff] [blame] | 1669 | TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS); |
| 1670 | TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | goto discard; |
| 1672 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1673 | EXPORT_SYMBOL(tcp_v4_do_rcv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | |
Paolo Abeni | 7487449 | 2017-09-28 15:51:36 +0200 | [diff] [blame] | 1675 | int tcp_v4_early_demux(struct sk_buff *skb) |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1676 | { |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1677 | const struct iphdr *iph; |
| 1678 | const struct tcphdr *th; |
| 1679 | struct sock *sk; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1680 | |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1681 | if (skb->pkt_type != PACKET_HOST) |
Paolo Abeni | 7487449 | 2017-09-28 15:51:36 +0200 | [diff] [blame] | 1682 | return 0; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1683 | |
Eric Dumazet | 45f00f9 | 2012-10-22 21:42:47 +0000 | [diff] [blame] | 1684 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) |
Paolo Abeni | 7487449 | 2017-09-28 15:51:36 +0200 | [diff] [blame] | 1685 | return 0; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1686 | |
| 1687 | iph = ip_hdr(skb); |
Eric Dumazet | 45f00f9 | 2012-10-22 21:42:47 +0000 | [diff] [blame] | 1688 | th = tcp_hdr(skb); |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1689 | |
| 1690 | if (th->doff < sizeof(struct tcphdr) / 4) |
Paolo Abeni | 7487449 | 2017-09-28 15:51:36 +0200 | [diff] [blame] | 1691 | return 0; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1692 | |
Eric Dumazet | 45f00f9 | 2012-10-22 21:42:47 +0000 | [diff] [blame] | 1693 | sk = __inet_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1694 | iph->saddr, th->source, |
Vijay Subramanian | 7011d08 | 2012-06-23 17:38:10 +0000 | [diff] [blame] | 1695 | iph->daddr, ntohs(th->dest), |
David Ahern | 3fa6f61 | 2017-08-07 08:44:17 -0700 | [diff] [blame] | 1696 | skb->skb_iif, inet_sdif(skb)); |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1697 | if (sk) { |
| 1698 | skb->sk = sk; |
| 1699 | skb->destructor = sock_edemux; |
Eric Dumazet | f7e4eb0 | 2015-03-15 21:12:13 -0700 | [diff] [blame] | 1700 | if (sk_fullsock(sk)) { |
Michal Kubeček | d0c294c | 2015-03-23 15:14:00 +0100 | [diff] [blame] | 1701 | struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst); |
Eric Dumazet | 505fbcf | 2012-07-27 06:23:40 +0000 | [diff] [blame] | 1702 | |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1703 | if (dst) |
| 1704 | dst = dst_check(dst, 0); |
David S. Miller | 92101b3 | 2012-07-23 16:29:00 -0700 | [diff] [blame] | 1705 | if (dst && |
Eric Dumazet | 505fbcf | 2012-07-27 06:23:40 +0000 | [diff] [blame] | 1706 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
David S. Miller | 92101b3 | 2012-07-23 16:29:00 -0700 | [diff] [blame] | 1707 | skb_dst_set_noref(skb, dst); |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1708 | } |
| 1709 | } |
Paolo Abeni | 7487449 | 2017-09-28 15:51:36 +0200 | [diff] [blame] | 1710 | return 0; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1711 | } |
| 1712 | |
Eric Dumazet | c9c3321 | 2016-08-27 07:37:54 -0700 | [diff] [blame] | 1713 | bool tcp_add_backlog(struct sock *sk, struct sk_buff *skb) |
| 1714 | { |
Eric Dumazet | 8265792 | 2019-10-09 15:21:13 -0700 | [diff] [blame] | 1715 | u32 limit = READ_ONCE(sk->sk_rcvbuf) + READ_ONCE(sk->sk_sndbuf); |
Eric Dumazet | 4f693b5 | 2018-11-27 14:42:03 -0800 | [diff] [blame] | 1716 | struct skb_shared_info *shinfo; |
| 1717 | const struct tcphdr *th; |
| 1718 | struct tcphdr *thtail; |
| 1719 | struct sk_buff *tail; |
| 1720 | unsigned int hdrlen; |
| 1721 | bool fragstolen; |
| 1722 | u32 gso_segs; |
| 1723 | int delta; |
Eric Dumazet | c9c3321 | 2016-08-27 07:37:54 -0700 | [diff] [blame] | 1724 | |
| 1725 | /* In case all data was pulled from skb frags (in __pskb_pull_tail()), |
| 1726 | * we can fix skb->truesize to its real value to avoid future drops. |
| 1727 | * This is valid because skb is not yet charged to the socket. |
| 1728 | * It has been noticed pure SACK packets were sometimes dropped |
| 1729 | * (if cooked by drivers without copybreak feature). |
| 1730 | */ |
Eric Dumazet | 60b1af3 | 2017-01-24 14:57:36 -0800 | [diff] [blame] | 1731 | skb_condense(skb); |
Eric Dumazet | c9c3321 | 2016-08-27 07:37:54 -0700 | [diff] [blame] | 1732 | |
Eric Dumazet | ade9628 | 2018-11-19 17:45:55 -0800 | [diff] [blame] | 1733 | skb_dst_drop(skb); |
| 1734 | |
Eric Dumazet | 4f693b5 | 2018-11-27 14:42:03 -0800 | [diff] [blame] | 1735 | if (unlikely(tcp_checksum_complete(skb))) { |
| 1736 | bh_unlock_sock(sk); |
| 1737 | __TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS); |
| 1738 | __TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS); |
| 1739 | return true; |
| 1740 | } |
| 1741 | |
| 1742 | /* Attempt coalescing to last skb in backlog, even if we are |
| 1743 | * above the limits. |
| 1744 | * This is okay because skb capacity is limited to MAX_SKB_FRAGS. |
| 1745 | */ |
| 1746 | th = (const struct tcphdr *)skb->data; |
| 1747 | hdrlen = th->doff * 4; |
| 1748 | shinfo = skb_shinfo(skb); |
| 1749 | |
| 1750 | if (!shinfo->gso_size) |
| 1751 | shinfo->gso_size = skb->len - hdrlen; |
| 1752 | |
| 1753 | if (!shinfo->gso_segs) |
| 1754 | shinfo->gso_segs = 1; |
| 1755 | |
| 1756 | tail = sk->sk_backlog.tail; |
| 1757 | if (!tail) |
| 1758 | goto no_coalesce; |
| 1759 | thtail = (struct tcphdr *)tail->data; |
| 1760 | |
| 1761 | if (TCP_SKB_CB(tail)->end_seq != TCP_SKB_CB(skb)->seq || |
| 1762 | TCP_SKB_CB(tail)->ip_dsfield != TCP_SKB_CB(skb)->ip_dsfield || |
| 1763 | ((TCP_SKB_CB(tail)->tcp_flags | |
Eric Dumazet | ca2fe29 | 2019-04-26 10:10:05 -0700 | [diff] [blame] | 1764 | TCP_SKB_CB(skb)->tcp_flags) & (TCPHDR_SYN | TCPHDR_RST | TCPHDR_URG)) || |
| 1765 | !((TCP_SKB_CB(tail)->tcp_flags & |
| 1766 | TCP_SKB_CB(skb)->tcp_flags) & TCPHDR_ACK) || |
Eric Dumazet | 4f693b5 | 2018-11-27 14:42:03 -0800 | [diff] [blame] | 1767 | ((TCP_SKB_CB(tail)->tcp_flags ^ |
| 1768 | TCP_SKB_CB(skb)->tcp_flags) & (TCPHDR_ECE | TCPHDR_CWR)) || |
| 1769 | #ifdef CONFIG_TLS_DEVICE |
| 1770 | tail->decrypted != skb->decrypted || |
| 1771 | #endif |
| 1772 | thtail->doff != th->doff || |
| 1773 | memcmp(thtail + 1, th + 1, hdrlen - sizeof(*th))) |
| 1774 | goto no_coalesce; |
| 1775 | |
| 1776 | __skb_pull(skb, hdrlen); |
| 1777 | if (skb_try_coalesce(tail, skb, &fragstolen, &delta)) { |
| 1778 | thtail->window = th->window; |
| 1779 | |
| 1780 | TCP_SKB_CB(tail)->end_seq = TCP_SKB_CB(skb)->end_seq; |
| 1781 | |
| 1782 | if (after(TCP_SKB_CB(skb)->ack_seq, TCP_SKB_CB(tail)->ack_seq)) |
| 1783 | TCP_SKB_CB(tail)->ack_seq = TCP_SKB_CB(skb)->ack_seq; |
| 1784 | |
Eric Dumazet | ca2fe29 | 2019-04-26 10:10:05 -0700 | [diff] [blame] | 1785 | /* We have to update both TCP_SKB_CB(tail)->tcp_flags and |
| 1786 | * thtail->fin, so that the fast path in tcp_rcv_established() |
| 1787 | * is not entered if we append a packet with a FIN. |
| 1788 | * SYN, RST, URG are not present. |
| 1789 | * ACK is set on both packets. |
| 1790 | * PSH : we do not really care in TCP stack, |
| 1791 | * at least for 'GRO' packets. |
| 1792 | */ |
| 1793 | thtail->fin |= th->fin; |
Eric Dumazet | 4f693b5 | 2018-11-27 14:42:03 -0800 | [diff] [blame] | 1794 | TCP_SKB_CB(tail)->tcp_flags |= TCP_SKB_CB(skb)->tcp_flags; |
| 1795 | |
| 1796 | if (TCP_SKB_CB(skb)->has_rxtstamp) { |
| 1797 | TCP_SKB_CB(tail)->has_rxtstamp = true; |
| 1798 | tail->tstamp = skb->tstamp; |
| 1799 | skb_hwtstamps(tail)->hwtstamp = skb_hwtstamps(skb)->hwtstamp; |
| 1800 | } |
| 1801 | |
| 1802 | /* Not as strict as GRO. We only need to carry mss max value */ |
| 1803 | skb_shinfo(tail)->gso_size = max(shinfo->gso_size, |
| 1804 | skb_shinfo(tail)->gso_size); |
| 1805 | |
| 1806 | gso_segs = skb_shinfo(tail)->gso_segs + shinfo->gso_segs; |
| 1807 | skb_shinfo(tail)->gso_segs = min_t(u32, gso_segs, 0xFFFF); |
| 1808 | |
| 1809 | sk->sk_backlog.len += delta; |
| 1810 | __NET_INC_STATS(sock_net(sk), |
| 1811 | LINUX_MIB_TCPBACKLOGCOALESCE); |
| 1812 | kfree_skb_partial(skb, fragstolen); |
| 1813 | return false; |
| 1814 | } |
| 1815 | __skb_push(skb, hdrlen); |
| 1816 | |
| 1817 | no_coalesce: |
| 1818 | /* Only socket owner can try to collapse/prune rx queues |
| 1819 | * to reduce memory overhead, so add a little headroom here. |
| 1820 | * Few sockets backlog are possibly concurrently non empty. |
| 1821 | */ |
| 1822 | limit += 64*1024; |
| 1823 | |
Eric Dumazet | c9c3321 | 2016-08-27 07:37:54 -0700 | [diff] [blame] | 1824 | if (unlikely(sk_add_backlog(sk, skb, limit))) { |
| 1825 | bh_unlock_sock(sk); |
| 1826 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPBACKLOGDROP); |
| 1827 | return true; |
| 1828 | } |
| 1829 | return false; |
| 1830 | } |
| 1831 | EXPORT_SYMBOL(tcp_add_backlog); |
| 1832 | |
Eric Dumazet | ac6e780 | 2016-11-10 13:12:35 -0800 | [diff] [blame] | 1833 | int tcp_filter(struct sock *sk, struct sk_buff *skb) |
| 1834 | { |
| 1835 | struct tcphdr *th = (struct tcphdr *)skb->data; |
Eric Dumazet | ac6e780 | 2016-11-10 13:12:35 -0800 | [diff] [blame] | 1836 | |
Christoph Paasch | f2feaef | 2019-03-11 11:41:05 -0700 | [diff] [blame] | 1837 | return sk_filter_trim_cap(sk, skb, th->doff * 4); |
Eric Dumazet | ac6e780 | 2016-11-10 13:12:35 -0800 | [diff] [blame] | 1838 | } |
| 1839 | EXPORT_SYMBOL(tcp_filter); |
| 1840 | |
Eric Dumazet | eeea10b | 2017-12-03 09:32:59 -0800 | [diff] [blame] | 1841 | static void tcp_v4_restore_cb(struct sk_buff *skb) |
| 1842 | { |
| 1843 | memmove(IPCB(skb), &TCP_SKB_CB(skb)->header.h4, |
| 1844 | sizeof(struct inet_skb_parm)); |
| 1845 | } |
| 1846 | |
| 1847 | static void tcp_v4_fill_cb(struct sk_buff *skb, const struct iphdr *iph, |
| 1848 | const struct tcphdr *th) |
| 1849 | { |
| 1850 | /* This is tricky : We move IPCB at its correct location into TCP_SKB_CB() |
| 1851 | * barrier() makes sure compiler wont play fool^Waliasing games. |
| 1852 | */ |
| 1853 | memmove(&TCP_SKB_CB(skb)->header.h4, IPCB(skb), |
| 1854 | sizeof(struct inet_skb_parm)); |
| 1855 | barrier(); |
| 1856 | |
| 1857 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
| 1858 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + |
| 1859 | skb->len - th->doff * 4); |
| 1860 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); |
| 1861 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); |
| 1862 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; |
| 1863 | TCP_SKB_CB(skb)->ip_dsfield = ipv4_get_dsfield(iph); |
| 1864 | TCP_SKB_CB(skb)->sacked = 0; |
| 1865 | TCP_SKB_CB(skb)->has_rxtstamp = |
| 1866 | skb->tstamp || skb_hwtstamps(skb)->hwtstamp; |
| 1867 | } |
| 1868 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | /* |
| 1870 | * From tcp_input.c |
| 1871 | */ |
| 1872 | |
| 1873 | int tcp_v4_rcv(struct sk_buff *skb) |
| 1874 | { |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1875 | struct net *net = dev_net(skb->dev); |
Eric Dumazet | 8b27dae | 2019-03-22 08:56:40 -0700 | [diff] [blame] | 1876 | struct sk_buff *skb_to_free; |
David Ahern | 3fa6f61 | 2017-08-07 08:44:17 -0700 | [diff] [blame] | 1877 | int sdif = inet_sdif(skb); |
David Ahern | 534322c | 2019-12-30 14:14:27 -0800 | [diff] [blame] | 1878 | int dif = inet_iif(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1879 | const struct iphdr *iph; |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1880 | const struct tcphdr *th; |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1881 | bool refcounted; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1882 | struct sock *sk; |
| 1883 | int ret; |
| 1884 | |
| 1885 | if (skb->pkt_type != PACKET_HOST) |
| 1886 | goto discard_it; |
| 1887 | |
| 1888 | /* Count it even if it's bad */ |
Eric Dumazet | 90bbcc6 | 2016-04-27 16:44:32 -0700 | [diff] [blame] | 1889 | __TCP_INC_STATS(net, TCP_MIB_INSEGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | |
| 1891 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) |
| 1892 | goto discard_it; |
| 1893 | |
Eric Dumazet | ea1627c | 2016-05-13 09:16:40 -0700 | [diff] [blame] | 1894 | th = (const struct tcphdr *)skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1895 | |
Eric Dumazet | ea1627c | 2016-05-13 09:16:40 -0700 | [diff] [blame] | 1896 | if (unlikely(th->doff < sizeof(struct tcphdr) / 4)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1897 | goto bad_packet; |
| 1898 | if (!pskb_may_pull(skb, th->doff * 4)) |
| 1899 | goto discard_it; |
| 1900 | |
| 1901 | /* An explanation is required here, I think. |
| 1902 | * Packet length and doff are validated by header prediction, |
Stephen Hemminger | caa20d9a | 2005-11-10 17:13:47 -0800 | [diff] [blame] | 1903 | * provided case of th->doff==0 is eliminated. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | * So, we defer the checks. */ |
Tom Herbert | ed70fcf | 2014-05-02 16:29:38 -0700 | [diff] [blame] | 1905 | |
| 1906 | if (skb_checksum_init(skb, IPPROTO_TCP, inet_compute_pseudo)) |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1907 | goto csum_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1908 | |
Eric Dumazet | ea1627c | 2016-05-13 09:16:40 -0700 | [diff] [blame] | 1909 | th = (const struct tcphdr *)skb->data; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1910 | iph = ip_hdr(skb); |
Eric Dumazet | 4bdc3d6 | 2015-10-13 17:12:54 -0700 | [diff] [blame] | 1911 | lookup: |
Craig Gallek | a583636 | 2016-02-10 11:50:38 -0500 | [diff] [blame] | 1912 | sk = __inet_lookup_skb(&tcp_hashinfo, skb, __tcp_hdrlen(th), th->source, |
David Ahern | 3fa6f61 | 2017-08-07 08:44:17 -0700 | [diff] [blame] | 1913 | th->dest, sdif, &refcounted); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | if (!sk) |
| 1915 | goto no_tcp_socket; |
| 1916 | |
Eric Dumazet | bb134d5 | 2010-03-09 05:55:56 +0000 | [diff] [blame] | 1917 | process: |
| 1918 | if (sk->sk_state == TCP_TIME_WAIT) |
| 1919 | goto do_time_wait; |
| 1920 | |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1921 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
| 1922 | struct request_sock *req = inet_reqsk(sk); |
Eric Dumazet | e0f9759 | 2018-02-13 06:14:12 -0800 | [diff] [blame] | 1923 | bool req_stolen = false; |
Eric Dumazet | 7716682 | 2016-02-18 05:39:18 -0800 | [diff] [blame] | 1924 | struct sock *nsk; |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1925 | |
| 1926 | sk = req->rsk_listener; |
David Ahern | 534322c | 2019-12-30 14:14:27 -0800 | [diff] [blame] | 1927 | if (unlikely(tcp_v4_inbound_md5_hash(sk, skb, dif, sdif))) { |
Eric Dumazet | e65c332 | 2016-08-24 08:50:24 -0700 | [diff] [blame] | 1928 | sk_drops_add(sk, skb); |
Eric Dumazet | 7292355 | 2016-02-11 22:50:29 -0800 | [diff] [blame] | 1929 | reqsk_put(req); |
| 1930 | goto discard_it; |
| 1931 | } |
Frank van der Linden | 4fd44a9 | 2018-06-12 23:09:37 +0000 | [diff] [blame] | 1932 | if (tcp_checksum_complete(skb)) { |
| 1933 | reqsk_put(req); |
| 1934 | goto csum_error; |
| 1935 | } |
Eric Dumazet | 7716682 | 2016-02-18 05:39:18 -0800 | [diff] [blame] | 1936 | if (unlikely(sk->sk_state != TCP_LISTEN)) { |
Eric Dumazet | f03f2e1 | 2015-10-14 11:16:27 -0700 | [diff] [blame] | 1937 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
Eric Dumazet | 4bdc3d6 | 2015-10-13 17:12:54 -0700 | [diff] [blame] | 1938 | goto lookup; |
| 1939 | } |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1940 | /* We own a reference on the listener, increase it again |
| 1941 | * as we might lose it too soon. |
| 1942 | */ |
Eric Dumazet | 7716682 | 2016-02-18 05:39:18 -0800 | [diff] [blame] | 1943 | sock_hold(sk); |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1944 | refcounted = true; |
Eric Dumazet | 1f3b359 | 2017-09-08 12:44:47 -0700 | [diff] [blame] | 1945 | nsk = NULL; |
Eric Dumazet | eeea10b | 2017-12-03 09:32:59 -0800 | [diff] [blame] | 1946 | if (!tcp_filter(sk, skb)) { |
| 1947 | th = (const struct tcphdr *)skb->data; |
| 1948 | iph = ip_hdr(skb); |
| 1949 | tcp_v4_fill_cb(skb, iph, th); |
Eric Dumazet | e0f9759 | 2018-02-13 06:14:12 -0800 | [diff] [blame] | 1950 | nsk = tcp_check_req(sk, skb, req, false, &req_stolen); |
Eric Dumazet | eeea10b | 2017-12-03 09:32:59 -0800 | [diff] [blame] | 1951 | } |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1952 | if (!nsk) { |
| 1953 | reqsk_put(req); |
Eric Dumazet | e0f9759 | 2018-02-13 06:14:12 -0800 | [diff] [blame] | 1954 | if (req_stolen) { |
| 1955 | /* Another cpu got exclusive access to req |
| 1956 | * and created a full blown socket. |
| 1957 | * Try to feed this packet to this socket |
| 1958 | * instead of discarding it. |
| 1959 | */ |
| 1960 | tcp_v4_restore_cb(skb); |
| 1961 | sock_put(sk); |
| 1962 | goto lookup; |
| 1963 | } |
Eric Dumazet | 7716682 | 2016-02-18 05:39:18 -0800 | [diff] [blame] | 1964 | goto discard_and_relse; |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1965 | } |
| 1966 | if (nsk == sk) { |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1967 | reqsk_put(req); |
Eric Dumazet | eeea10b | 2017-12-03 09:32:59 -0800 | [diff] [blame] | 1968 | tcp_v4_restore_cb(skb); |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1969 | } else if (tcp_child_process(sk, nsk, skb)) { |
| 1970 | tcp_v4_send_reset(nsk, skb); |
Eric Dumazet | 7716682 | 2016-02-18 05:39:18 -0800 | [diff] [blame] | 1971 | goto discard_and_relse; |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1972 | } else { |
Eric Dumazet | 7716682 | 2016-02-18 05:39:18 -0800 | [diff] [blame] | 1973 | sock_put(sk); |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1974 | return 0; |
| 1975 | } |
| 1976 | } |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 1977 | if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { |
Eric Dumazet | 02a1d6e | 2016-04-27 16:44:39 -0700 | [diff] [blame] | 1978 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
Stephen Hemminger | d218d11 | 2010-01-11 16:28:01 -0800 | [diff] [blame] | 1979 | goto discard_and_relse; |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 1980 | } |
Stephen Hemminger | d218d11 | 2010-01-11 16:28:01 -0800 | [diff] [blame] | 1981 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 1983 | goto discard_and_relse; |
Dmitry Popov | 9ea88a1 | 2014-08-07 02:38:22 +0400 | [diff] [blame] | 1984 | |
David Ahern | 534322c | 2019-12-30 14:14:27 -0800 | [diff] [blame] | 1985 | if (tcp_v4_inbound_md5_hash(sk, skb, dif, sdif)) |
Dmitry Popov | 9ea88a1 | 2014-08-07 02:38:22 +0400 | [diff] [blame] | 1986 | goto discard_and_relse; |
Dmitry Popov | 9ea88a1 | 2014-08-07 02:38:22 +0400 | [diff] [blame] | 1987 | |
Florian Westphal | 895b5c9 | 2019-09-29 20:54:03 +0200 | [diff] [blame] | 1988 | nf_reset_ct(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1989 | |
Eric Dumazet | ac6e780 | 2016-11-10 13:12:35 -0800 | [diff] [blame] | 1990 | if (tcp_filter(sk, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1991 | goto discard_and_relse; |
Eric Dumazet | ac6e780 | 2016-11-10 13:12:35 -0800 | [diff] [blame] | 1992 | th = (const struct tcphdr *)skb->data; |
| 1993 | iph = ip_hdr(skb); |
Eric Dumazet | eeea10b | 2017-12-03 09:32:59 -0800 | [diff] [blame] | 1994 | tcp_v4_fill_cb(skb, iph, th); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1995 | |
| 1996 | skb->dev = NULL; |
| 1997 | |
Eric Dumazet | e994b2f | 2015-10-02 11:43:39 -0700 | [diff] [blame] | 1998 | if (sk->sk_state == TCP_LISTEN) { |
| 1999 | ret = tcp_v4_do_rcv(sk, skb); |
| 2000 | goto put_and_return; |
| 2001 | } |
| 2002 | |
| 2003 | sk_incoming_cpu_update(sk); |
| 2004 | |
Ingo Molnar | c636618 | 2006-07-03 00:25:13 -0700 | [diff] [blame] | 2005 | bh_lock_sock_nested(sk); |
Martin KaFai Lau | a44d6ea | 2016-03-14 10:52:15 -0700 | [diff] [blame] | 2006 | tcp_segs_in(tcp_sk(sk), skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2007 | ret = 0; |
| 2008 | if (!sock_owned_by_user(sk)) { |
Eric Dumazet | 8b27dae | 2019-03-22 08:56:40 -0700 | [diff] [blame] | 2009 | skb_to_free = sk->sk_rx_skb_cache; |
| 2010 | sk->sk_rx_skb_cache = NULL; |
Florian Westphal | e7942d0 | 2017-07-30 03:57:18 +0200 | [diff] [blame] | 2011 | ret = tcp_v4_do_rcv(sk, skb); |
Eric Dumazet | 8b27dae | 2019-03-22 08:56:40 -0700 | [diff] [blame] | 2012 | } else { |
| 2013 | if (tcp_add_backlog(sk, skb)) |
| 2014 | goto discard_and_relse; |
| 2015 | skb_to_free = NULL; |
Zhu Yi | 6b03a53 | 2010-03-04 18:01:41 +0000 | [diff] [blame] | 2016 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2017 | bh_unlock_sock(sk); |
Eric Dumazet | 8b27dae | 2019-03-22 08:56:40 -0700 | [diff] [blame] | 2018 | if (skb_to_free) |
| 2019 | __kfree_skb(skb_to_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | |
Eric Dumazet | e994b2f | 2015-10-02 11:43:39 -0700 | [diff] [blame] | 2021 | put_and_return: |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 2022 | if (refcounted) |
| 2023 | sock_put(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2024 | |
| 2025 | return ret; |
| 2026 | |
| 2027 | no_tcp_socket: |
| 2028 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 2029 | goto discard_it; |
| 2030 | |
Eric Dumazet | eeea10b | 2017-12-03 09:32:59 -0800 | [diff] [blame] | 2031 | tcp_v4_fill_cb(skb, iph, th); |
| 2032 | |
Eric Dumazet | 12e25e1 | 2015-06-03 23:49:21 -0700 | [diff] [blame] | 2033 | if (tcp_checksum_complete(skb)) { |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 2034 | csum_error: |
Eric Dumazet | 90bbcc6 | 2016-04-27 16:44:32 -0700 | [diff] [blame] | 2035 | __TCP_INC_STATS(net, TCP_MIB_CSUMERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2036 | bad_packet: |
Eric Dumazet | 90bbcc6 | 2016-04-27 16:44:32 -0700 | [diff] [blame] | 2037 | __TCP_INC_STATS(net, TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2039 | tcp_v4_send_reset(NULL, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2040 | } |
| 2041 | |
| 2042 | discard_it: |
| 2043 | /* Discard frame. */ |
| 2044 | kfree_skb(skb); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2045 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2046 | |
| 2047 | discard_and_relse: |
Eric Dumazet | 532182c | 2016-04-01 08:52:19 -0700 | [diff] [blame] | 2048 | sk_drops_add(sk, skb); |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 2049 | if (refcounted) |
| 2050 | sock_put(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2051 | goto discard_it; |
| 2052 | |
| 2053 | do_time_wait: |
| 2054 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 2055 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2056 | goto discard_it; |
| 2057 | } |
| 2058 | |
Eric Dumazet | eeea10b | 2017-12-03 09:32:59 -0800 | [diff] [blame] | 2059 | tcp_v4_fill_cb(skb, iph, th); |
| 2060 | |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 2061 | if (tcp_checksum_complete(skb)) { |
| 2062 | inet_twsk_put(inet_twsk(sk)); |
| 2063 | goto csum_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2064 | } |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 2065 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | case TCP_TW_SYN: { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 2067 | struct sock *sk2 = inet_lookup_listener(dev_net(skb->dev), |
Craig Gallek | a583636 | 2016-02-10 11:50:38 -0500 | [diff] [blame] | 2068 | &tcp_hashinfo, skb, |
| 2069 | __tcp_hdrlen(th), |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 2070 | iph->saddr, th->source, |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 2071 | iph->daddr, th->dest, |
David Ahern | 3fa6f61 | 2017-08-07 08:44:17 -0700 | [diff] [blame] | 2072 | inet_iif(skb), |
| 2073 | sdif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2074 | if (sk2) { |
Eric Dumazet | dbe7faa | 2015-07-08 14:28:30 -0700 | [diff] [blame] | 2075 | inet_twsk_deschedule_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2076 | sk = sk2; |
Eric Dumazet | eeea10b | 2017-12-03 09:32:59 -0800 | [diff] [blame] | 2077 | tcp_v4_restore_cb(skb); |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 2078 | refcounted = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2079 | goto process; |
| 2080 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2081 | } |
Gustavo A. R. Silva | fcfd6df | 2017-10-16 15:48:55 -0500 | [diff] [blame] | 2082 | /* to ACK */ |
Joe Perches | a8eceea | 2020-03-12 15:50:22 -0700 | [diff] [blame] | 2083 | fallthrough; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | case TCP_TW_ACK: |
| 2085 | tcp_v4_timewait_ack(sk, skb); |
| 2086 | break; |
| 2087 | case TCP_TW_RST: |
Florian Westphal | 271c3b9 | 2015-12-21 21:29:26 +0100 | [diff] [blame] | 2088 | tcp_v4_send_reset(sk, skb); |
| 2089 | inet_twsk_deschedule_put(inet_twsk(sk)); |
| 2090 | goto discard_it; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2091 | case TCP_TW_SUCCESS:; |
| 2092 | } |
| 2093 | goto discard_it; |
| 2094 | } |
| 2095 | |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 2096 | static struct timewait_sock_ops tcp_timewait_sock_ops = { |
| 2097 | .twsk_obj_size = sizeof(struct tcp_timewait_sock), |
| 2098 | .twsk_unique = tcp_twsk_unique, |
| 2099 | .twsk_destructor= tcp_twsk_destructor, |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 2100 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2101 | |
Eric Dumazet | 63d02d1 | 2012-08-09 14:11:00 +0000 | [diff] [blame] | 2102 | void inet_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 2103 | { |
| 2104 | struct dst_entry *dst = skb_dst(skb); |
| 2105 | |
Eric Dumazet | 5037e9e | 2015-12-14 14:08:53 -0800 | [diff] [blame] | 2106 | if (dst && dst_hold_safe(dst)) { |
Eric Dumazet | ca777ef | 2014-09-08 08:06:07 -0700 | [diff] [blame] | 2107 | sk->sk_rx_dst = dst; |
| 2108 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; |
| 2109 | } |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 2110 | } |
Eric Dumazet | 63d02d1 | 2012-08-09 14:11:00 +0000 | [diff] [blame] | 2111 | EXPORT_SYMBOL(inet_sk_rx_dst_set); |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 2112 | |
Stephen Hemminger | 3b401a8 | 2009-09-01 19:25:04 +0000 | [diff] [blame] | 2113 | const struct inet_connection_sock_af_ops ipv4_specific = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2114 | .queue_xmit = ip_queue_xmit, |
| 2115 | .send_check = tcp_v4_send_check, |
| 2116 | .rebuild_header = inet_sk_rebuild_header, |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 2117 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2118 | .conn_request = tcp_v4_conn_request, |
| 2119 | .syn_recv_sock = tcp_v4_syn_recv_sock, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2120 | .net_header_len = sizeof(struct iphdr), |
| 2121 | .setsockopt = ip_setsockopt, |
| 2122 | .getsockopt = ip_getsockopt, |
| 2123 | .addr2sockaddr = inet_csk_addr2sockaddr, |
| 2124 | .sockaddr_len = sizeof(struct sockaddr_in), |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2125 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2126 | .compat_setsockopt = compat_ip_setsockopt, |
| 2127 | .compat_getsockopt = compat_ip_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2128 | #endif |
Neal Cardwell | 4fab907 | 2014-08-14 12:40:05 -0400 | [diff] [blame] | 2129 | .mtu_reduced = tcp_v4_mtu_reduced, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2130 | }; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2131 | EXPORT_SYMBOL(ipv4_specific); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2132 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2133 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3de | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 2134 | static const struct tcp_sock_af_ops tcp_sock_ipv4_specific = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2135 | .md5_lookup = tcp_v4_md5_lookup, |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 2136 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2137 | .md5_parse = tcp_v4_parse_md5_keys, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2138 | }; |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 2139 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2141 | /* NOTE: A lot of things set to zero explicitly by call to |
| 2142 | * sk_alloc() so need not be done here. |
| 2143 | */ |
| 2144 | static int tcp_v4_init_sock(struct sock *sk) |
| 2145 | { |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2146 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2147 | |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 2148 | tcp_init_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2149 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 2150 | icsk->icsk_af_ops = &ipv4_specific; |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 2151 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2152 | #ifdef CONFIG_TCP_MD5SIG |
David S. Miller | ac807fa | 2012-04-23 03:21:58 -0400 | [diff] [blame] | 2153 | tcp_sk(sk)->af_specific = &tcp_sock_ipv4_specific; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2154 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2155 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | return 0; |
| 2157 | } |
| 2158 | |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 2159 | void tcp_v4_destroy_sock(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | { |
| 2161 | struct tcp_sock *tp = tcp_sk(sk); |
| 2162 | |
Song Liu | e1a4aa5 | 2017-10-23 09:20:26 -0700 | [diff] [blame] | 2163 | trace_tcp_destroy_sock(sk); |
| 2164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2165 | tcp_clear_xmit_timers(sk); |
| 2166 | |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2167 | tcp_cleanup_congestion_control(sk); |
Stephen Hemminger | 317a76f | 2005-06-23 12:19:55 -0700 | [diff] [blame] | 2168 | |
Dave Watson | 734942c | 2017-06-14 11:37:14 -0700 | [diff] [blame] | 2169 | tcp_cleanup_ulp(sk); |
| 2170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2171 | /* Cleanup up the write buffer. */ |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 2172 | tcp_write_queue_purge(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2173 | |
Wei Wang | cf1ef3f | 2017-04-20 14:45:46 -0700 | [diff] [blame] | 2174 | /* Check if we want to disable active TFO */ |
| 2175 | tcp_fastopen_active_disable_ofo_check(sk); |
| 2176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2177 | /* Cleans up our, hopefully empty, out_of_order_queue. */ |
Yaogong Wang | 9f5afea | 2016-09-07 14:49:28 -0700 | [diff] [blame] | 2178 | skb_rbtree_purge(&tp->out_of_order_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2179 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2180 | #ifdef CONFIG_TCP_MD5SIG |
| 2181 | /* Clean up the MD5 key list, if any */ |
| 2182 | if (tp->md5sig_info) { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 2183 | tcp_clear_md5_list(sk); |
Mat Martineau | fb7df5e | 2017-12-21 10:29:10 -0800 | [diff] [blame] | 2184 | kfree_rcu(rcu_dereference_protected(tp->md5sig_info, 1), rcu); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2185 | tp->md5sig_info = NULL; |
| 2186 | } |
| 2187 | #endif |
| 2188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2189 | /* Clean up a referenced TCP bind bucket. */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2190 | if (inet_csk(sk)->icsk_bind_hash) |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 2191 | inet_put_port(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2192 | |
Eric Dumazet | d983ea6 | 2019-10-10 20:17:38 -0700 | [diff] [blame] | 2193 | BUG_ON(rcu_access_pointer(tp->fastopen_rsk)); |
William Allen Simpson | 435cf55 | 2009-12-02 18:17:05 +0000 | [diff] [blame] | 2194 | |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 2195 | /* If socket is aborted during connect operation */ |
| 2196 | tcp_free_fastopen_req(tp); |
Yuchung Cheng | 1fba70e | 2017-10-18 11:22:51 -0700 | [diff] [blame] | 2197 | tcp_fastopen_destroy_cipher(sk); |
Eric Dumazet | cd8ae85 | 2015-05-03 21:34:46 -0700 | [diff] [blame] | 2198 | tcp_saved_syn_free(tp); |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 2199 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2200 | sk_sockets_allocated_dec(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2201 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2202 | EXPORT_SYMBOL(tcp_v4_destroy_sock); |
| 2203 | |
| 2204 | #ifdef CONFIG_PROC_FS |
| 2205 | /* Proc filesystem TCP sock list dumping. */ |
| 2206 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2207 | /* |
| 2208 | * Get next listener socket follow cur. If cur is NULL, get first socket |
| 2209 | * starting from bucket given in st->bucket; when st->bucket is zero the |
| 2210 | * very first socket in the hash table is returned. |
| 2211 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2212 | static void *listening_get_next(struct seq_file *seq, void *cur) |
| 2213 | { |
Christoph Hellwig | 37d849b | 2018-04-11 09:31:28 +0200 | [diff] [blame] | 2214 | struct tcp_seq_afinfo *afinfo = PDE_DATA(file_inode(seq->file)); |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2215 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 2216 | struct net *net = seq_file_net(seq); |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 2217 | struct inet_listen_hashbucket *ilb; |
Eric Dumazet | 8dbd76e | 2019-12-13 18:20:41 -0800 | [diff] [blame] | 2218 | struct hlist_nulls_node *node; |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 2219 | struct sock *sk = cur; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2220 | |
| 2221 | if (!sk) { |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 2222 | get_head: |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2223 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
Eric Dumazet | 9652dc2 | 2016-10-19 21:24:58 -0700 | [diff] [blame] | 2224 | spin_lock(&ilb->lock); |
Eric Dumazet | 8dbd76e | 2019-12-13 18:20:41 -0800 | [diff] [blame] | 2225 | sk = sk_nulls_head(&ilb->nulls_head); |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2226 | st->offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2227 | goto get_sk; |
| 2228 | } |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2229 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2230 | ++st->num; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2231 | ++st->offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2232 | |
Eric Dumazet | 8dbd76e | 2019-12-13 18:20:41 -0800 | [diff] [blame] | 2233 | sk = sk_nulls_next(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2234 | get_sk: |
Eric Dumazet | 8dbd76e | 2019-12-13 18:20:41 -0800 | [diff] [blame] | 2235 | sk_nulls_for_each_from(sk, node) { |
Pavel Emelyanov | 8475ef9 | 2010-11-22 03:26:12 +0000 | [diff] [blame] | 2236 | if (!net_eq(sock_net(sk), net)) |
| 2237 | continue; |
Christoph Hellwig | 37d849b | 2018-04-11 09:31:28 +0200 | [diff] [blame] | 2238 | if (sk->sk_family == afinfo->family) |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 2239 | return sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2240 | } |
Eric Dumazet | 9652dc2 | 2016-10-19 21:24:58 -0700 | [diff] [blame] | 2241 | spin_unlock(&ilb->lock); |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2242 | st->offset = 0; |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 2243 | if (++st->bucket < INET_LHTABLE_SIZE) |
| 2244 | goto get_head; |
| 2245 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2246 | } |
| 2247 | |
| 2248 | static void *listening_get_idx(struct seq_file *seq, loff_t *pos) |
| 2249 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2250 | struct tcp_iter_state *st = seq->private; |
| 2251 | void *rc; |
| 2252 | |
| 2253 | st->bucket = 0; |
| 2254 | st->offset = 0; |
| 2255 | rc = listening_get_next(seq, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2256 | |
| 2257 | while (rc && *pos) { |
| 2258 | rc = listening_get_next(seq, rc); |
| 2259 | --*pos; |
| 2260 | } |
| 2261 | return rc; |
| 2262 | } |
| 2263 | |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2264 | static inline bool empty_bucket(const struct tcp_iter_state *st) |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2265 | { |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2266 | return hlist_nulls_empty(&tcp_hashinfo.ehash[st->bucket].chain); |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2267 | } |
| 2268 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2269 | /* |
| 2270 | * Get first established socket starting from bucket given in st->bucket. |
| 2271 | * If st->bucket is zero, the very first socket in the hash is returned. |
| 2272 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2273 | static void *established_get_first(struct seq_file *seq) |
| 2274 | { |
Christoph Hellwig | 37d849b | 2018-04-11 09:31:28 +0200 | [diff] [blame] | 2275 | struct tcp_seq_afinfo *afinfo = PDE_DATA(file_inode(seq->file)); |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2276 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 2277 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2278 | void *rc = NULL; |
| 2279 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2280 | st->offset = 0; |
| 2281 | for (; st->bucket <= tcp_hashinfo.ehash_mask; ++st->bucket) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2282 | struct sock *sk; |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2283 | struct hlist_nulls_node *node; |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2284 | spinlock_t *lock = inet_ehash_lockp(&tcp_hashinfo, st->bucket); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2285 | |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2286 | /* Lockless fast path for the common case of empty buckets */ |
| 2287 | if (empty_bucket(st)) |
| 2288 | continue; |
| 2289 | |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2290 | spin_lock_bh(lock); |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2291 | sk_nulls_for_each(sk, node, &tcp_hashinfo.ehash[st->bucket].chain) { |
Christoph Hellwig | 37d849b | 2018-04-11 09:31:28 +0200 | [diff] [blame] | 2292 | if (sk->sk_family != afinfo->family || |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2293 | !net_eq(sock_net(sk), net)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2294 | continue; |
| 2295 | } |
| 2296 | rc = sk; |
| 2297 | goto out; |
| 2298 | } |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2299 | spin_unlock_bh(lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2300 | } |
| 2301 | out: |
| 2302 | return rc; |
| 2303 | } |
| 2304 | |
| 2305 | static void *established_get_next(struct seq_file *seq, void *cur) |
| 2306 | { |
Christoph Hellwig | 37d849b | 2018-04-11 09:31:28 +0200 | [diff] [blame] | 2307 | struct tcp_seq_afinfo *afinfo = PDE_DATA(file_inode(seq->file)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2308 | struct sock *sk = cur; |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2309 | struct hlist_nulls_node *node; |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2310 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 2311 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2312 | |
| 2313 | ++st->num; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2314 | ++st->offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2315 | |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2316 | sk = sk_nulls_next(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2317 | |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2318 | sk_nulls_for_each_from(sk, node) { |
Christoph Hellwig | 37d849b | 2018-04-11 09:31:28 +0200 | [diff] [blame] | 2319 | if (sk->sk_family == afinfo->family && |
| 2320 | net_eq(sock_net(sk), net)) |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2321 | return sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2322 | } |
| 2323 | |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2324 | spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
| 2325 | ++st->bucket; |
| 2326 | return established_get_first(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2327 | } |
| 2328 | |
| 2329 | static void *established_get_idx(struct seq_file *seq, loff_t pos) |
| 2330 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2331 | struct tcp_iter_state *st = seq->private; |
| 2332 | void *rc; |
| 2333 | |
| 2334 | st->bucket = 0; |
| 2335 | rc = established_get_first(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2336 | |
| 2337 | while (rc && pos) { |
| 2338 | rc = established_get_next(seq, rc); |
| 2339 | --pos; |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 2340 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2341 | return rc; |
| 2342 | } |
| 2343 | |
| 2344 | static void *tcp_get_idx(struct seq_file *seq, loff_t pos) |
| 2345 | { |
| 2346 | void *rc; |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2347 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2348 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2349 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2350 | rc = listening_get_idx(seq, &pos); |
| 2351 | |
| 2352 | if (!rc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2353 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
| 2354 | rc = established_get_idx(seq, pos); |
| 2355 | } |
| 2356 | |
| 2357 | return rc; |
| 2358 | } |
| 2359 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2360 | static void *tcp_seek_last_pos(struct seq_file *seq) |
| 2361 | { |
| 2362 | struct tcp_iter_state *st = seq->private; |
| 2363 | int offset = st->offset; |
| 2364 | int orig_num = st->num; |
| 2365 | void *rc = NULL; |
| 2366 | |
| 2367 | switch (st->state) { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2368 | case TCP_SEQ_STATE_LISTENING: |
| 2369 | if (st->bucket >= INET_LHTABLE_SIZE) |
| 2370 | break; |
| 2371 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2372 | rc = listening_get_next(seq, NULL); |
| 2373 | while (offset-- && rc) |
| 2374 | rc = listening_get_next(seq, rc); |
| 2375 | if (rc) |
| 2376 | break; |
| 2377 | st->bucket = 0; |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2378 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
Joe Perches | a8eceea | 2020-03-12 15:50:22 -0700 | [diff] [blame] | 2379 | fallthrough; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2380 | case TCP_SEQ_STATE_ESTABLISHED: |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2381 | if (st->bucket > tcp_hashinfo.ehash_mask) |
| 2382 | break; |
| 2383 | rc = established_get_first(seq); |
| 2384 | while (offset-- && rc) |
| 2385 | rc = established_get_next(seq, rc); |
| 2386 | } |
| 2387 | |
| 2388 | st->num = orig_num; |
| 2389 | |
| 2390 | return rc; |
| 2391 | } |
| 2392 | |
Christoph Hellwig | 37d849b | 2018-04-11 09:31:28 +0200 | [diff] [blame] | 2393 | void *tcp_seq_start(struct seq_file *seq, loff_t *pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2394 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2395 | struct tcp_iter_state *st = seq->private; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2396 | void *rc; |
| 2397 | |
| 2398 | if (*pos && *pos == st->last_pos) { |
| 2399 | rc = tcp_seek_last_pos(seq); |
| 2400 | if (rc) |
| 2401 | goto out; |
| 2402 | } |
| 2403 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2404 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2405 | st->num = 0; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2406 | st->bucket = 0; |
| 2407 | st->offset = 0; |
| 2408 | rc = *pos ? tcp_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| 2409 | |
| 2410 | out: |
| 2411 | st->last_pos = *pos; |
| 2412 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2413 | } |
Christoph Hellwig | 37d849b | 2018-04-11 09:31:28 +0200 | [diff] [blame] | 2414 | EXPORT_SYMBOL(tcp_seq_start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2415 | |
Christoph Hellwig | 37d849b | 2018-04-11 09:31:28 +0200 | [diff] [blame] | 2416 | void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2417 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2418 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2419 | void *rc = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2420 | |
| 2421 | if (v == SEQ_START_TOKEN) { |
| 2422 | rc = tcp_get_idx(seq, 0); |
| 2423 | goto out; |
| 2424 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2425 | |
| 2426 | switch (st->state) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2427 | case TCP_SEQ_STATE_LISTENING: |
| 2428 | rc = listening_get_next(seq, v); |
| 2429 | if (!rc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2430 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2431 | st->bucket = 0; |
| 2432 | st->offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2433 | rc = established_get_first(seq); |
| 2434 | } |
| 2435 | break; |
| 2436 | case TCP_SEQ_STATE_ESTABLISHED: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2437 | rc = established_get_next(seq, v); |
| 2438 | break; |
| 2439 | } |
| 2440 | out: |
| 2441 | ++*pos; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2442 | st->last_pos = *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2443 | return rc; |
| 2444 | } |
Christoph Hellwig | 37d849b | 2018-04-11 09:31:28 +0200 | [diff] [blame] | 2445 | EXPORT_SYMBOL(tcp_seq_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2446 | |
Christoph Hellwig | 37d849b | 2018-04-11 09:31:28 +0200 | [diff] [blame] | 2447 | void tcp_seq_stop(struct seq_file *seq, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2448 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2449 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2450 | |
| 2451 | switch (st->state) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2452 | case TCP_SEQ_STATE_LISTENING: |
| 2453 | if (v != SEQ_START_TOKEN) |
Eric Dumazet | 9652dc2 | 2016-10-19 21:24:58 -0700 | [diff] [blame] | 2454 | spin_unlock(&tcp_hashinfo.listening_hash[st->bucket].lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2455 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2456 | case TCP_SEQ_STATE_ESTABLISHED: |
| 2457 | if (v) |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2458 | spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2459 | break; |
| 2460 | } |
| 2461 | } |
Christoph Hellwig | 37d849b | 2018-04-11 09:31:28 +0200 | [diff] [blame] | 2462 | EXPORT_SYMBOL(tcp_seq_stop); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2463 | |
Eric Dumazet | d4f0687 | 2015-03-12 16:44:09 -0700 | [diff] [blame] | 2464 | static void get_openreq4(const struct request_sock *req, |
Eric Dumazet | aa3a0c8 | 2015-10-02 11:43:30 -0700 | [diff] [blame] | 2465 | struct seq_file *f, int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2466 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2467 | const struct inet_request_sock *ireq = inet_rsk(req); |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 2468 | long delta = req->rsk_timer.expires - jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2469 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2470 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2471 | " %02X %08X:%08X %02X:%08lX %08X %5u %8d %u %d %pK", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2472 | i, |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 2473 | ireq->ir_loc_addr, |
Eric Dumazet | d4f0687 | 2015-03-12 16:44:09 -0700 | [diff] [blame] | 2474 | ireq->ir_num, |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 2475 | ireq->ir_rmt_addr, |
| 2476 | ntohs(ireq->ir_rmt_port), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2477 | TCP_SYN_RECV, |
| 2478 | 0, 0, /* could print option size, but that is af dependent. */ |
| 2479 | 1, /* timers active (only the expire timer) */ |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2480 | jiffies_delta_to_clock_t(delta), |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 2481 | req->num_timeout, |
Eric Dumazet | aa3a0c8 | 2015-10-02 11:43:30 -0700 | [diff] [blame] | 2482 | from_kuid_munged(seq_user_ns(f), |
| 2483 | sock_i_uid(req->rsk_listener)), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2484 | 0, /* non standard timer */ |
| 2485 | 0, /* open_requests have no inode */ |
Eric Dumazet | d4f0687 | 2015-03-12 16:44:09 -0700 | [diff] [blame] | 2486 | 0, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2487 | req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2488 | } |
| 2489 | |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2490 | static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2491 | { |
| 2492 | int timer_active; |
| 2493 | unsigned long timer_expires; |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2494 | const struct tcp_sock *tp = tcp_sk(sk); |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2495 | const struct inet_connection_sock *icsk = inet_csk(sk); |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2496 | const struct inet_sock *inet = inet_sk(sk); |
Eric Dumazet | 0536fcc | 2015-09-29 07:42:52 -0700 | [diff] [blame] | 2497 | const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq; |
Eric Dumazet | c720c7e8 | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 2498 | __be32 dest = inet->inet_daddr; |
| 2499 | __be32 src = inet->inet_rcv_saddr; |
| 2500 | __u16 destp = ntohs(inet->inet_dport); |
| 2501 | __u16 srcp = ntohs(inet->inet_sport); |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2502 | int rx_queue; |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2503 | int state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2504 | |
Nandita Dukkipati | 6ba8a3b | 2013-03-11 10:00:43 +0000 | [diff] [blame] | 2505 | if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
Yuchung Cheng | 57dde7f | 2017-01-12 22:11:33 -0800 | [diff] [blame] | 2506 | icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT || |
Nandita Dukkipati | 6ba8a3b | 2013-03-11 10:00:43 +0000 | [diff] [blame] | 2507 | icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2508 | timer_active = 1; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2509 | timer_expires = icsk->icsk_timeout; |
| 2510 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2511 | timer_active = 4; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2512 | timer_expires = icsk->icsk_timeout; |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2513 | } else if (timer_pending(&sk->sk_timer)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2514 | timer_active = 2; |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2515 | timer_expires = sk->sk_timer.expires; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2516 | } else { |
| 2517 | timer_active = 0; |
| 2518 | timer_expires = jiffies; |
| 2519 | } |
| 2520 | |
Yafang Shao | 986ffdf | 2017-12-20 11:12:52 +0800 | [diff] [blame] | 2521 | state = inet_sk_state_load(sk); |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2522 | if (state == TCP_LISTEN) |
Eric Dumazet | 288efe8 | 2019-11-05 14:11:53 -0800 | [diff] [blame] | 2523 | rx_queue = READ_ONCE(sk->sk_ack_backlog); |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2524 | else |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2525 | /* Because we don't lock the socket, |
| 2526 | * we might find a transient negative value. |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2527 | */ |
Eric Dumazet | dba7d9b | 2019-10-10 20:17:39 -0700 | [diff] [blame] | 2528 | rx_queue = max_t(int, READ_ONCE(tp->rcv_nxt) - |
Eric Dumazet | 7db48e9 | 2019-10-10 20:17:40 -0700 | [diff] [blame] | 2529 | READ_ONCE(tp->copied_seq), 0); |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2530 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2531 | seq_printf(f, "%4d: %08X:%04X %08X:%04X %02X %08X:%08X %02X:%08lX " |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2532 | "%08X %5u %8d %lu %d %pK %lu %lu %u %u %d", |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2533 | i, src, srcp, dest, destp, state, |
Eric Dumazet | 0f31746 | 2019-10-10 20:17:41 -0700 | [diff] [blame] | 2534 | READ_ONCE(tp->write_seq) - tp->snd_una, |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2535 | rx_queue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2536 | timer_active, |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2537 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2538 | icsk->icsk_retransmits, |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 2539 | from_kuid_munged(seq_user_ns(f), sock_i_uid(sk)), |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2540 | icsk->icsk_probes_out, |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2541 | sock_i_ino(sk), |
Reshetova, Elena | 41c6d65 | 2017-06-30 13:08:01 +0300 | [diff] [blame] | 2542 | refcount_read(&sk->sk_refcnt), sk, |
Stephen Hemminger | 7be8735 | 2008-06-27 20:00:19 -0700 | [diff] [blame] | 2543 | jiffies_to_clock_t(icsk->icsk_rto), |
| 2544 | jiffies_to_clock_t(icsk->icsk_ack.ato), |
Wei Wang | 31954cd | 2019-01-25 10:53:19 -0800 | [diff] [blame] | 2545 | (icsk->icsk_ack.quick << 1) | inet_csk_in_pingpong_mode(sk), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2546 | tp->snd_cwnd, |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2547 | state == TCP_LISTEN ? |
| 2548 | fastopenq->max_qlen : |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2549 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2550 | } |
| 2551 | |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2552 | static void get_timewait4_sock(const struct inet_timewait_sock *tw, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2553 | struct seq_file *f, int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2554 | { |
Eric Dumazet | 789f558 | 2015-04-12 18:51:09 -0700 | [diff] [blame] | 2555 | long delta = tw->tw_timer.expires - jiffies; |
Al Viro | 23f33c2 | 2006-09-27 18:43:50 -0700 | [diff] [blame] | 2556 | __be32 dest, src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2557 | __u16 destp, srcp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2558 | |
| 2559 | dest = tw->tw_daddr; |
| 2560 | src = tw->tw_rcv_saddr; |
| 2561 | destp = ntohs(tw->tw_dport); |
| 2562 | srcp = ntohs(tw->tw_sport); |
| 2563 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2564 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2565 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2566 | i, src, srcp, dest, destp, tw->tw_substate, 0, 0, |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2567 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
Reshetova, Elena | 41c6d65 | 2017-06-30 13:08:01 +0300 | [diff] [blame] | 2568 | refcount_read(&tw->tw_refcnt), tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2569 | } |
| 2570 | |
| 2571 | #define TMPSZ 150 |
| 2572 | |
| 2573 | static int tcp4_seq_show(struct seq_file *seq, void *v) |
| 2574 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2575 | struct tcp_iter_state *st; |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2576 | struct sock *sk = v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2577 | |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2578 | seq_setwidth(seq, TMPSZ - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2579 | if (v == SEQ_START_TOKEN) { |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2580 | seq_puts(seq, " sl local_address rem_address st tx_queue " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2581 | "rx_queue tr tm->when retrnsmt uid timeout " |
| 2582 | "inode"); |
| 2583 | goto out; |
| 2584 | } |
| 2585 | st = seq->private; |
| 2586 | |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 2587 | if (sk->sk_state == TCP_TIME_WAIT) |
| 2588 | get_timewait4_sock(v, seq, st->num); |
| 2589 | else if (sk->sk_state == TCP_NEW_SYN_RECV) |
Eric Dumazet | aa3a0c8 | 2015-10-02 11:43:30 -0700 | [diff] [blame] | 2590 | get_openreq4(v, seq, st->num); |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 2591 | else |
| 2592 | get_tcp4_sock(v, seq, st->num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2593 | out: |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2594 | seq_pad(seq, '\n'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2595 | return 0; |
| 2596 | } |
| 2597 | |
Christoph Hellwig | 37d849b | 2018-04-11 09:31:28 +0200 | [diff] [blame] | 2598 | static const struct seq_operations tcp4_seq_ops = { |
| 2599 | .show = tcp4_seq_show, |
| 2600 | .start = tcp_seq_start, |
| 2601 | .next = tcp_seq_next, |
| 2602 | .stop = tcp_seq_stop, |
| 2603 | }; |
| 2604 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2605 | static struct tcp_seq_afinfo tcp4_seq_afinfo = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2606 | .family = AF_INET, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2607 | }; |
| 2608 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2609 | static int __net_init tcp4_proc_init_net(struct net *net) |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2610 | { |
Christoph Hellwig | c350637 | 2018-04-10 19:42:55 +0200 | [diff] [blame] | 2611 | if (!proc_create_net_data("tcp", 0444, net->proc_net, &tcp4_seq_ops, |
| 2612 | sizeof(struct tcp_iter_state), &tcp4_seq_afinfo)) |
Christoph Hellwig | 37d849b | 2018-04-11 09:31:28 +0200 | [diff] [blame] | 2613 | return -ENOMEM; |
| 2614 | return 0; |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2615 | } |
| 2616 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2617 | static void __net_exit tcp4_proc_exit_net(struct net *net) |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2618 | { |
Christoph Hellwig | 37d849b | 2018-04-11 09:31:28 +0200 | [diff] [blame] | 2619 | remove_proc_entry("tcp", net->proc_net); |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2620 | } |
| 2621 | |
| 2622 | static struct pernet_operations tcp4_net_ops = { |
| 2623 | .init = tcp4_proc_init_net, |
| 2624 | .exit = tcp4_proc_exit_net, |
| 2625 | }; |
| 2626 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2627 | int __init tcp4_proc_init(void) |
| 2628 | { |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2629 | return register_pernet_subsys(&tcp4_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2630 | } |
| 2631 | |
| 2632 | void tcp4_proc_exit(void) |
| 2633 | { |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2634 | unregister_pernet_subsys(&tcp4_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2635 | } |
| 2636 | #endif /* CONFIG_PROC_FS */ |
| 2637 | |
| 2638 | struct proto tcp_prot = { |
| 2639 | .name = "TCP", |
| 2640 | .owner = THIS_MODULE, |
| 2641 | .close = tcp_close, |
Andrey Ignatov | d74bad4 | 2018-03-30 15:08:05 -0700 | [diff] [blame] | 2642 | .pre_connect = tcp_v4_pre_connect, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2643 | .connect = tcp_v4_connect, |
| 2644 | .disconnect = tcp_disconnect, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2645 | .accept = inet_csk_accept, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2646 | .ioctl = tcp_ioctl, |
| 2647 | .init = tcp_v4_init_sock, |
| 2648 | .destroy = tcp_v4_destroy_sock, |
| 2649 | .shutdown = tcp_shutdown, |
| 2650 | .setsockopt = tcp_setsockopt, |
| 2651 | .getsockopt = tcp_getsockopt, |
Ursula Braun | 4b9d07a | 2017-01-09 16:55:12 +0100 | [diff] [blame] | 2652 | .keepalive = tcp_set_keepalive, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2653 | .recvmsg = tcp_recvmsg, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 2654 | .sendmsg = tcp_sendmsg, |
| 2655 | .sendpage = tcp_sendpage, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2656 | .backlog_rcv = tcp_v4_do_rcv, |
Eric Dumazet | 46d3cea | 2012-07-11 05:50:31 +0000 | [diff] [blame] | 2657 | .release_cb = tcp_release_cb, |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 2658 | .hash = inet_hash, |
| 2659 | .unhash = inet_unhash, |
| 2660 | .get_port = inet_csk_get_port, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2661 | .enter_memory_pressure = tcp_enter_memory_pressure, |
Eric Dumazet | 0604475 | 2017-06-07 13:29:12 -0700 | [diff] [blame] | 2662 | .leave_memory_pressure = tcp_leave_memory_pressure, |
Eric Dumazet | c9bee3b7 | 2013-07-22 20:27:07 -0700 | [diff] [blame] | 2663 | .stream_memory_free = tcp_stream_memory_free, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2664 | .sockets_allocated = &tcp_sockets_allocated, |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 2665 | .orphan_count = &tcp_orphan_count, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2666 | .memory_allocated = &tcp_memory_allocated, |
| 2667 | .memory_pressure = &tcp_memory_pressure, |
Eric W. Biederman | a4fe34b | 2013-10-19 16:25:36 -0700 | [diff] [blame] | 2668 | .sysctl_mem = sysctl_tcp_mem, |
Eric Dumazet | 356d183 | 2017-11-07 00:29:28 -0800 | [diff] [blame] | 2669 | .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem), |
| 2670 | .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_tcp_rmem), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2671 | .max_header = MAX_TCP_HEADER, |
| 2672 | .obj_size = sizeof(struct tcp_sock), |
Paul E. McKenney | 5f0d5a3 | 2017-01-18 02:53:44 -0800 | [diff] [blame] | 2673 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2674 | .twsk_prot = &tcp_timewait_sock_ops, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 2675 | .rsk_prot = &tcp_request_sock_ops, |
Pavel Emelyanov | 39d8cda | 2008-03-22 16:50:58 -0700 | [diff] [blame] | 2676 | .h.hashinfo = &tcp_hashinfo, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 2677 | .no_autobind = true, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2678 | #ifdef CONFIG_COMPAT |
| 2679 | .compat_setsockopt = compat_tcp_setsockopt, |
| 2680 | .compat_getsockopt = compat_tcp_getsockopt, |
| 2681 | #endif |
Lorenzo Colitti | c1e64e2 | 2015-12-16 12:30:05 +0900 | [diff] [blame] | 2682 | .diag_destroy = tcp_abort, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2683 | }; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2684 | EXPORT_SYMBOL(tcp_prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2685 | |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2686 | static void __net_exit tcp_sk_exit(struct net *net) |
| 2687 | { |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 2688 | int cpu; |
| 2689 | |
Dust Li | b506bc9 | 2019-04-01 16:04:53 +0800 | [diff] [blame] | 2690 | if (net->ipv4.tcp_congestion_control) |
Martin KaFai Lau | 0baf26b | 2020-01-08 16:35:08 -0800 | [diff] [blame] | 2691 | bpf_module_put(net->ipv4.tcp_congestion_control, |
| 2692 | net->ipv4.tcp_congestion_control->owner); |
Stephen Hemminger | 6670e15 | 2017-11-14 08:25:49 -0800 | [diff] [blame] | 2693 | |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 2694 | for_each_possible_cpu(cpu) |
| 2695 | inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv4.tcp_sk, cpu)); |
| 2696 | free_percpu(net->ipv4.tcp_sk); |
| 2697 | } |
| 2698 | |
| 2699 | static int __net_init tcp_sk_init(struct net *net) |
| 2700 | { |
Haishuang Yan | fee83d0 | 2016-12-28 17:52:33 +0800 | [diff] [blame] | 2701 | int res, cpu, cnt; |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 2702 | |
| 2703 | net->ipv4.tcp_sk = alloc_percpu(struct sock *); |
| 2704 | if (!net->ipv4.tcp_sk) |
| 2705 | return -ENOMEM; |
| 2706 | |
| 2707 | for_each_possible_cpu(cpu) { |
| 2708 | struct sock *sk; |
| 2709 | |
| 2710 | res = inet_ctl_sock_create(&sk, PF_INET, SOCK_RAW, |
| 2711 | IPPROTO_TCP, net); |
| 2712 | if (res) |
| 2713 | goto fail; |
Eric Dumazet | a9d6532 | 2016-04-01 08:52:21 -0700 | [diff] [blame] | 2714 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); |
Eric Dumazet | 431280e | 2018-08-22 13:30:45 -0700 | [diff] [blame] | 2715 | |
| 2716 | /* Please enforce IP_DF and IPID==0 for RST and |
| 2717 | * ACK sent in SYN-RECV and TIME-WAIT state. |
| 2718 | */ |
| 2719 | inet_sk(sk)->pmtudisc = IP_PMTUDISC_DO; |
| 2720 | |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 2721 | *per_cpu_ptr(net->ipv4.tcp_sk, cpu) = sk; |
| 2722 | } |
Daniel Borkmann | 4921355 | 2015-05-19 21:04:22 +0200 | [diff] [blame] | 2723 | |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 2724 | net->ipv4.sysctl_tcp_ecn = 2; |
Daniel Borkmann | 4921355 | 2015-05-19 21:04:22 +0200 | [diff] [blame] | 2725 | net->ipv4.sysctl_tcp_ecn_fallback = 1; |
| 2726 | |
Fan Du | b0f9ca5 | 2015-02-10 09:53:16 +0800 | [diff] [blame] | 2727 | net->ipv4.sysctl_tcp_base_mss = TCP_BASE_MSS; |
Eric Dumazet | 5f3e2bf00 | 2019-06-06 09:15:31 -0700 | [diff] [blame] | 2728 | net->ipv4.sysctl_tcp_min_snd_mss = TCP_MIN_SND_MSS; |
Fan Du | 6b58e0a | 2015-03-06 11:18:23 +0800 | [diff] [blame] | 2729 | net->ipv4.sysctl_tcp_probe_threshold = TCP_PROBE_THRESHOLD; |
Fan Du | 05cbc0d | 2015-03-06 11:18:24 +0800 | [diff] [blame] | 2730 | net->ipv4.sysctl_tcp_probe_interval = TCP_PROBE_INTERVAL; |
Josh Hunt | c04b79b | 2019-08-07 19:52:29 -0400 | [diff] [blame] | 2731 | net->ipv4.sysctl_tcp_mtu_probe_floor = TCP_MIN_SND_MSS; |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 2732 | |
Nikolay Borisov | 13b287e | 2016-01-07 16:38:43 +0200 | [diff] [blame] | 2733 | net->ipv4.sysctl_tcp_keepalive_time = TCP_KEEPALIVE_TIME; |
Nikolay Borisov | 9bd6861 | 2016-01-07 16:38:44 +0200 | [diff] [blame] | 2734 | net->ipv4.sysctl_tcp_keepalive_probes = TCP_KEEPALIVE_PROBES; |
Nikolay Borisov | b840d15 | 2016-01-07 16:38:45 +0200 | [diff] [blame] | 2735 | net->ipv4.sysctl_tcp_keepalive_intvl = TCP_KEEPALIVE_INTVL; |
Nikolay Borisov | 13b287e | 2016-01-07 16:38:43 +0200 | [diff] [blame] | 2736 | |
Nikolay Borisov | 6fa2516 | 2016-02-03 09:46:49 +0200 | [diff] [blame] | 2737 | net->ipv4.sysctl_tcp_syn_retries = TCP_SYN_RETRIES; |
Nikolay Borisov | 7c083ec | 2016-02-03 09:46:50 +0200 | [diff] [blame] | 2738 | net->ipv4.sysctl_tcp_synack_retries = TCP_SYNACK_RETRIES; |
David S. Miller | 0aca737 | 2016-02-08 04:24:33 -0500 | [diff] [blame] | 2739 | net->ipv4.sysctl_tcp_syncookies = 1; |
Nikolay Borisov | 1043e25 | 2016-02-03 09:46:52 +0200 | [diff] [blame] | 2740 | net->ipv4.sysctl_tcp_reordering = TCP_FASTRETRANS_THRESH; |
Nikolay Borisov | ae5c3f4 | 2016-02-03 09:46:53 +0200 | [diff] [blame] | 2741 | net->ipv4.sysctl_tcp_retries1 = TCP_RETR1; |
Nikolay Borisov | c6214a9 | 2016-02-03 09:46:54 +0200 | [diff] [blame] | 2742 | net->ipv4.sysctl_tcp_retries2 = TCP_RETR2; |
Nikolay Borisov | c402d9b | 2016-02-03 09:46:55 +0200 | [diff] [blame] | 2743 | net->ipv4.sysctl_tcp_orphan_retries = 0; |
Nikolay Borisov | 1e579ca | 2016-02-03 09:46:56 +0200 | [diff] [blame] | 2744 | net->ipv4.sysctl_tcp_fin_timeout = TCP_FIN_TIMEOUT; |
Nikolay Borisov | 4979f2d | 2016-02-03 09:46:57 +0200 | [diff] [blame] | 2745 | net->ipv4.sysctl_tcp_notsent_lowat = UINT_MAX; |
Maciej Żenczykowski | 79e9fed | 2018-06-03 10:41:17 -0700 | [diff] [blame] | 2746 | net->ipv4.sysctl_tcp_tw_reuse = 2; |
Kevin(Yudong) Yang | 65e6d90 | 2019-12-09 14:19:59 -0500 | [diff] [blame] | 2747 | net->ipv4.sysctl_tcp_no_ssthresh_metrics_save = 1; |
Nikolay Borisov | 12ed824 | 2016-02-03 09:46:51 +0200 | [diff] [blame] | 2748 | |
Haishuang Yan | fee83d0 | 2016-12-28 17:52:33 +0800 | [diff] [blame] | 2749 | cnt = tcp_hashinfo.ehash_mask + 1; |
Yafang Shao | 743e481 | 2018-09-01 20:21:05 +0800 | [diff] [blame] | 2750 | net->ipv4.tcp_death_row.sysctl_max_tw_buckets = cnt / 2; |
Haishuang Yan | 1946e67 | 2016-12-28 17:52:32 +0800 | [diff] [blame] | 2751 | net->ipv4.tcp_death_row.hashinfo = &tcp_hashinfo; |
| 2752 | |
Eric Dumazet | 623d0c2 | 2019-10-30 10:05:46 -0700 | [diff] [blame] | 2753 | net->ipv4.sysctl_max_syn_backlog = max(128, cnt / 128); |
Eric Dumazet | f930103 | 2017-06-07 10:34:37 -0700 | [diff] [blame] | 2754 | net->ipv4.sysctl_tcp_sack = 1; |
Eric Dumazet | 9bb37ef | 2017-06-07 10:34:38 -0700 | [diff] [blame] | 2755 | net->ipv4.sysctl_tcp_window_scaling = 1; |
Eric Dumazet | 5d2ed05 | 2017-06-07 10:34:39 -0700 | [diff] [blame] | 2756 | net->ipv4.sysctl_tcp_timestamps = 1; |
Eric Dumazet | 2ae21cf | 2017-10-26 21:54:56 -0700 | [diff] [blame] | 2757 | net->ipv4.sysctl_tcp_early_retrans = 3; |
Eric Dumazet | e20223f | 2017-10-26 21:54:57 -0700 | [diff] [blame] | 2758 | net->ipv4.sysctl_tcp_recovery = TCP_RACK_LOSS_DETECTION; |
Eric Dumazet | b510f0d | 2017-10-26 21:54:59 -0700 | [diff] [blame] | 2759 | net->ipv4.sysctl_tcp_slow_start_after_idle = 1; /* By default, RFC2861 behavior. */ |
Eric Dumazet | e0a1e5b | 2017-10-26 21:55:00 -0700 | [diff] [blame] | 2760 | net->ipv4.sysctl_tcp_retrans_collapse = 1; |
Eric Dumazet | c6e2180 | 2017-10-26 21:55:06 -0700 | [diff] [blame] | 2761 | net->ipv4.sysctl_tcp_max_reordering = 300; |
Eric Dumazet | 6496f6b | 2017-10-26 21:55:07 -0700 | [diff] [blame] | 2762 | net->ipv4.sysctl_tcp_dsack = 1; |
Eric Dumazet | 0c12654 | 2017-10-26 21:55:08 -0700 | [diff] [blame] | 2763 | net->ipv4.sysctl_tcp_app_win = 31; |
Eric Dumazet | 94f0893 | 2017-10-26 21:55:09 -0700 | [diff] [blame] | 2764 | net->ipv4.sysctl_tcp_adv_win_scale = 1; |
Eric Dumazet | af9b69a | 2017-10-26 21:55:10 -0700 | [diff] [blame] | 2765 | net->ipv4.sysctl_tcp_frto = 2; |
Eric Dumazet | 4540c0c | 2017-10-27 07:47:22 -0700 | [diff] [blame] | 2766 | net->ipv4.sysctl_tcp_moderate_rcvbuf = 1; |
Eric Dumazet | d06a990 | 2017-10-27 07:47:23 -0700 | [diff] [blame] | 2767 | /* This limits the percentage of the congestion window which we |
| 2768 | * will allow a single TSO frame to consume. Building TSO frames |
| 2769 | * which are too large can cause TCP streams to be bursty. |
| 2770 | */ |
| 2771 | net->ipv4.sysctl_tcp_tso_win_divisor = 3; |
Eric Dumazet | c73e580 | 2018-11-11 07:34:28 -0800 | [diff] [blame] | 2772 | /* Default TSQ limit of 16 TSO segments */ |
| 2773 | net->ipv4.sysctl_tcp_limit_output_bytes = 16 * 65536; |
Eric Dumazet | b530b68 | 2017-10-27 07:47:26 -0700 | [diff] [blame] | 2774 | /* rfc5961 challenge ack rate limiting */ |
| 2775 | net->ipv4.sysctl_tcp_challenge_ack_limit = 1000; |
Eric Dumazet | 26e9596 | 2017-10-27 07:47:27 -0700 | [diff] [blame] | 2776 | net->ipv4.sysctl_tcp_min_tso_segs = 2; |
Eric Dumazet | bd23970 | 2017-10-27 07:47:28 -0700 | [diff] [blame] | 2777 | net->ipv4.sysctl_tcp_min_rtt_wlen = 300; |
Eric Dumazet | 790f00e | 2017-10-27 07:47:29 -0700 | [diff] [blame] | 2778 | net->ipv4.sysctl_tcp_autocorking = 1; |
Eric Dumazet | 4170ba6 | 2017-10-27 07:47:30 -0700 | [diff] [blame] | 2779 | net->ipv4.sysctl_tcp_invalid_ratelimit = HZ/2; |
Eric Dumazet | 23a7102a | 2017-10-27 07:47:31 -0700 | [diff] [blame] | 2780 | net->ipv4.sysctl_tcp_pacing_ss_ratio = 200; |
Eric Dumazet | c26e91f | 2017-10-27 07:47:32 -0700 | [diff] [blame] | 2781 | net->ipv4.sysctl_tcp_pacing_ca_ratio = 120; |
Eric Dumazet | 356d183 | 2017-11-07 00:29:28 -0800 | [diff] [blame] | 2782 | if (net != &init_net) { |
| 2783 | memcpy(net->ipv4.sysctl_tcp_rmem, |
| 2784 | init_net.ipv4.sysctl_tcp_rmem, |
| 2785 | sizeof(init_net.ipv4.sysctl_tcp_rmem)); |
| 2786 | memcpy(net->ipv4.sysctl_tcp_wmem, |
| 2787 | init_net.ipv4.sysctl_tcp_wmem, |
| 2788 | sizeof(init_net.ipv4.sysctl_tcp_wmem)); |
| 2789 | } |
Eric Dumazet | 6d82aa2 | 2018-05-17 14:47:28 -0700 | [diff] [blame] | 2790 | net->ipv4.sysctl_tcp_comp_sack_delay_ns = NSEC_PER_MSEC; |
Eric Dumazet | a70437c | 2020-04-30 10:35:43 -0700 | [diff] [blame] | 2791 | net->ipv4.sysctl_tcp_comp_sack_slack_ns = 100 * NSEC_PER_USEC; |
Eric Dumazet | 9c21d2f | 2018-05-17 14:47:29 -0700 | [diff] [blame] | 2792 | net->ipv4.sysctl_tcp_comp_sack_nr = 44; |
Haishuang Yan | e1cfcbe | 2017-09-27 11:35:40 +0800 | [diff] [blame] | 2793 | net->ipv4.sysctl_tcp_fastopen = TFO_CLIENT_ENABLE; |
Haishuang Yan | 4371384 | 2017-09-27 11:35:42 +0800 | [diff] [blame] | 2794 | spin_lock_init(&net->ipv4.tcp_fastopen_ctx_lock); |
Haishuang Yan | 3733be1 | 2017-09-27 11:35:43 +0800 | [diff] [blame] | 2795 | net->ipv4.sysctl_tcp_fastopen_blackhole_timeout = 60 * 60; |
| 2796 | atomic_set(&net->ipv4.tfo_active_disable_times, 0); |
Haishuang Yan | e1cfcbe | 2017-09-27 11:35:40 +0800 | [diff] [blame] | 2797 | |
Stephen Hemminger | 6670e15 | 2017-11-14 08:25:49 -0800 | [diff] [blame] | 2798 | /* Reno is always built in */ |
| 2799 | if (!net_eq(net, &init_net) && |
Martin KaFai Lau | 0baf26b | 2020-01-08 16:35:08 -0800 | [diff] [blame] | 2800 | bpf_try_module_get(init_net.ipv4.tcp_congestion_control, |
| 2801 | init_net.ipv4.tcp_congestion_control->owner)) |
Stephen Hemminger | 6670e15 | 2017-11-14 08:25:49 -0800 | [diff] [blame] | 2802 | net->ipv4.tcp_congestion_control = init_net.ipv4.tcp_congestion_control; |
| 2803 | else |
| 2804 | net->ipv4.tcp_congestion_control = &tcp_reno; |
| 2805 | |
Daniel Borkmann | 4921355 | 2015-05-19 21:04:22 +0200 | [diff] [blame] | 2806 | return 0; |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 2807 | fail: |
| 2808 | tcp_sk_exit(net); |
| 2809 | |
| 2810 | return res; |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 2811 | } |
| 2812 | |
| 2813 | static void __net_exit tcp_sk_exit_batch(struct list_head *net_exit_list) |
| 2814 | { |
Haishuang Yan | 4371384 | 2017-09-27 11:35:42 +0800 | [diff] [blame] | 2815 | struct net *net; |
| 2816 | |
Haishuang Yan | 1946e67 | 2016-12-28 17:52:32 +0800 | [diff] [blame] | 2817 | inet_twsk_purge(&tcp_hashinfo, AF_INET); |
Haishuang Yan | 4371384 | 2017-09-27 11:35:42 +0800 | [diff] [blame] | 2818 | |
| 2819 | list_for_each_entry(net, net_exit_list, exit_list) |
| 2820 | tcp_fastopen_ctx_destroy(net); |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2821 | } |
| 2822 | |
| 2823 | static struct pernet_operations __net_initdata tcp_sk_ops = { |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 2824 | .init = tcp_sk_init, |
| 2825 | .exit = tcp_sk_exit, |
| 2826 | .exit_batch = tcp_sk_exit_batch, |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2827 | }; |
| 2828 | |
Denis V. Lunev | 9b0f976 | 2008-02-29 11:13:15 -0800 | [diff] [blame] | 2829 | void __init tcp_v4_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2830 | { |
Eric W. Biederman | 6a1b305 | 2009-02-22 00:10:18 -0800 | [diff] [blame] | 2831 | if (register_pernet_subsys(&tcp_sk_ops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2832 | panic("Failed to create the TCP control socket.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2833 | } |