Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * Implementation of the Transmission Control Protocol(TCP). |
| 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * IPv4 specific functions |
| 9 | * |
| 10 | * |
| 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 |
| 17 | * |
| 18 | * This program is free software; you can redistribute it and/or |
| 19 | * modify it under the terms of the GNU General Public License |
| 20 | * as published by the Free Software Foundation; either version |
| 21 | * 2 of the License, or (at your option) any later version. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * Changes: |
| 26 | * David S. Miller : New socket lookup architecture. |
| 27 | * This code is dedicated to John Dyson. |
| 28 | * David S. Miller : Change semantics of established hash, |
| 29 | * half is devoted to TIME_WAIT sockets |
| 30 | * and the rest go in the other half. |
| 31 | * Andi Kleen : Add support for syncookies and fixed |
| 32 | * some bugs: ip options weren't passed to |
| 33 | * the TCP layer, missed a check for an |
| 34 | * ACK bit. |
| 35 | * Andi Kleen : Implemented fast path mtu discovery. |
| 36 | * Fixed many serious bugs in the |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 37 | * request_sock handling and moved |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | * most of it into the af independent code. |
| 39 | * Added tail drop and some other bugfixes. |
Stephen Hemminger | caa20d9a | 2005-11-10 17:13:47 -0800 | [diff] [blame] | 40 | * Added new listen semantics. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | * Mike McLagan : Routing by source |
| 42 | * Juan Jose Ciarlante: ip_dynaddr bits |
| 43 | * Andi Kleen: various fixes. |
| 44 | * Vitaly E. Lavrov : Transparent proxy revived after year |
| 45 | * coma. |
| 46 | * Andi Kleen : Fix new listen. |
| 47 | * Andi Kleen : Fix accept error reporting. |
| 48 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which |
| 49 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind |
| 50 | * a single port at the same time. |
| 51 | */ |
| 52 | |
Joe Perches | afd46503 | 2012-03-12 07:03:32 +0000 | [diff] [blame] | 53 | #define pr_fmt(fmt) "TCP: " fmt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
Herbert Xu | eb4dea5 | 2008-12-29 23:04:08 -0800 | [diff] [blame] | 55 | #include <linux/bottom_half.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #include <linux/types.h> |
| 57 | #include <linux/fcntl.h> |
| 58 | #include <linux/module.h> |
| 59 | #include <linux/random.h> |
| 60 | #include <linux/cache.h> |
| 61 | #include <linux/jhash.h> |
| 62 | #include <linux/init.h> |
| 63 | #include <linux/times.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 64 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 66 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | #include <net/icmp.h> |
Arnaldo Carvalho de Melo | 304a161 | 2005-08-09 19:59:20 -0700 | [diff] [blame] | 68 | #include <net/inet_hashtables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | #include <net/tcp.h> |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 70 | #include <net/transp_v6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | #include <net/ipv6.h> |
| 72 | #include <net/inet_common.h> |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 73 | #include <net/timewait_sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | #include <net/xfrm.h> |
David S. Miller | 6e5714e | 2011-08-03 20:50:44 -0700 | [diff] [blame] | 75 | #include <net/secure_seq.h> |
Eliezer Tamir | 076bb0c | 2013-07-10 17:13:17 +0300 | [diff] [blame] | 76 | #include <net/busy_poll.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
| 78 | #include <linux/inet.h> |
| 79 | #include <linux/ipv6.h> |
| 80 | #include <linux/stddef.h> |
| 81 | #include <linux/proc_fs.h> |
| 82 | #include <linux/seq_file.h> |
| 83 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 84 | #include <linux/crypto.h> |
| 85 | #include <linux/scatterlist.h> |
| 86 | |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 87 | int sysctl_tcp_tw_reuse __read_mostly; |
| 88 | int sysctl_tcp_low_latency __read_mostly; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 89 | EXPORT_SYMBOL(sysctl_tcp_low_latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 91 | #ifdef CONFIG_TCP_MD5SIG |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 92 | 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] | 93 | __be32 daddr, __be32 saddr, const struct tcphdr *th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 94 | #endif |
| 95 | |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 96 | struct inet_hashinfo tcp_hashinfo; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 97 | EXPORT_SYMBOL(tcp_hashinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
Octavian Purdila | 936b8bd | 2014-06-25 17:09:57 +0300 | [diff] [blame] | 99 | static __u32 tcp_v4_init_sequence(const struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 101 | return secure_tcp_sequence_number(ip_hdr(skb)->daddr, |
| 102 | ip_hdr(skb)->saddr, |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 103 | tcp_hdr(skb)->dest, |
| 104 | tcp_hdr(skb)->source); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } |
| 106 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 107 | int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp) |
| 108 | { |
| 109 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sktw); |
| 110 | struct tcp_sock *tp = tcp_sk(sk); |
| 111 | |
| 112 | /* With PAWS, it is safe from the viewpoint |
| 113 | of data integrity. Even without PAWS it is safe provided sequence |
| 114 | spaces do not overlap i.e. at data rates <= 80Mbit/sec. |
| 115 | |
| 116 | Actually, the idea is close to VJ's one, only timestamp cache is |
| 117 | held not per host, but per port pair and TW bucket is used as state |
| 118 | holder. |
| 119 | |
| 120 | If TW bucket has been already destroyed we fall back to VJ's scheme |
| 121 | and use initial timestamp retrieved from peer table. |
| 122 | */ |
| 123 | if (tcptw->tw_ts_recent_stamp && |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 124 | (!twp || (sysctl_tcp_tw_reuse && |
James Morris | 9d729f7 | 2007-03-04 16:12:44 -0800 | [diff] [blame] | 125 | get_seconds() - tcptw->tw_ts_recent_stamp > 1))) { |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 126 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; |
| 127 | if (tp->write_seq == 0) |
| 128 | tp->write_seq = 1; |
| 129 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; |
| 130 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; |
| 131 | sock_hold(sktw); |
| 132 | return 1; |
| 133 | } |
| 134 | |
| 135 | return 0; |
| 136 | } |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 137 | EXPORT_SYMBOL_GPL(tcp_twsk_unique); |
| 138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | /* This will initiate an outgoing connection. */ |
| 140 | int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
| 141 | { |
David S. Miller | 2d7192d | 2011-04-26 13:28:44 -0700 | [diff] [blame] | 142 | struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | struct inet_sock *inet = inet_sk(sk); |
| 144 | struct tcp_sock *tp = tcp_sk(sk); |
David S. Miller | dca8b08 | 2011-02-24 13:38:12 -0800 | [diff] [blame] | 145 | __be16 orig_sport, orig_dport; |
Al Viro | bada8ad | 2006-09-26 21:27:15 -0700 | [diff] [blame] | 146 | __be32 daddr, nexthop; |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 147 | struct flowi4 *fl4; |
David S. Miller | 2d7192d | 2011-04-26 13:28:44 -0700 | [diff] [blame] | 148 | struct rtable *rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | int err; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 150 | struct ip_options_rcu *inet_opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | |
| 152 | if (addr_len < sizeof(struct sockaddr_in)) |
| 153 | return -EINVAL; |
| 154 | |
| 155 | if (usin->sin_family != AF_INET) |
| 156 | return -EAFNOSUPPORT; |
| 157 | |
| 158 | nexthop = daddr = usin->sin_addr.s_addr; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 159 | inet_opt = rcu_dereference_protected(inet->inet_opt, |
| 160 | sock_owned_by_user(sk)); |
| 161 | if (inet_opt && inet_opt->opt.srr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | if (!daddr) |
| 163 | return -EINVAL; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 164 | nexthop = inet_opt->opt.faddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | } |
| 166 | |
David S. Miller | dca8b08 | 2011-02-24 13:38:12 -0800 | [diff] [blame] | 167 | orig_sport = inet->inet_sport; |
| 168 | orig_dport = usin->sin_port; |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 169 | fl4 = &inet->cork.fl.u.ip4; |
| 170 | rt = ip_route_connect(fl4, nexthop, inet->inet_saddr, |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 171 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, |
| 172 | IPPROTO_TCP, |
Steffen Klassert | 0e0d44a | 2013-08-28 08:04:14 +0200 | [diff] [blame] | 173 | orig_sport, orig_dport, sk); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 174 | if (IS_ERR(rt)) { |
| 175 | err = PTR_ERR(rt); |
| 176 | if (err == -ENETUNREACH) |
Eric Dumazet | f1d8cba | 2013-11-28 09:51:22 -0800 | [diff] [blame] | 177 | IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 178 | return err; |
Wei Dong | 584bdf8 | 2007-05-31 22:49:28 -0700 | [diff] [blame] | 179 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
| 181 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { |
| 182 | ip_rt_put(rt); |
| 183 | return -ENETUNREACH; |
| 184 | } |
| 185 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 186 | if (!inet_opt || !inet_opt->opt.srr) |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 187 | daddr = fl4->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 189 | if (!inet->inet_saddr) |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 190 | inet->inet_saddr = fl4->saddr; |
Eric Dumazet | d1e559d | 2015-03-18 14:05:35 -0700 | [diff] [blame] | 191 | sk_rcv_saddr_set(sk, inet->inet_saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 193 | if (tp->rx_opt.ts_recent_stamp && inet->inet_daddr != daddr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | /* Reset inherited state */ |
| 195 | tp->rx_opt.ts_recent = 0; |
| 196 | tp->rx_opt.ts_recent_stamp = 0; |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 197 | if (likely(!tp->repair)) |
| 198 | tp->write_seq = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | } |
| 200 | |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 201 | if (tcp_death_row.sysctl_tw_recycle && |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 202 | !tp->rx_opt.ts_recent_stamp && fl4->daddr == daddr) |
| 203 | tcp_fetch_timewait_stamp(sk, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 205 | inet->inet_dport = usin->sin_port; |
Eric Dumazet | d1e559d | 2015-03-18 14:05:35 -0700 | [diff] [blame] | 206 | sk_daddr_set(sk, daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 208 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 209 | if (inet_opt) |
| 210 | inet_csk(sk)->icsk_ext_hdr_len = inet_opt->opt.optlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | |
William Allen Simpson | bee7ca9 | 2009-11-10 09:51:18 +0000 | [diff] [blame] | 212 | tp->rx_opt.mss_clamp = TCP_MSS_DEFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | |
| 214 | /* Socket identity is still unknown (sport may be zero). |
| 215 | * However we set state to SYN-SENT and not releasing socket |
| 216 | * lock select source port, enter ourselves into the hash tables and |
| 217 | * complete initialization after this. |
| 218 | */ |
| 219 | tcp_set_state(sk, TCP_SYN_SENT); |
Arnaldo Carvalho de Melo | a7f5e7f | 2005-12-13 23:25:31 -0800 | [diff] [blame] | 220 | err = inet_hash_connect(&tcp_death_row, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | if (err) |
| 222 | goto failure; |
| 223 | |
Tom Herbert | 877d1f6 | 2015-07-28 16:02:05 -0700 | [diff] [blame] | 224 | sk_set_txhash(sk); |
Sathya Perla | 9e7ceb0 | 2014-10-22 21:42:01 +0530 | [diff] [blame] | 225 | |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 226 | rt = ip_route_newports(fl4, rt, orig_sport, orig_dport, |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 227 | inet->inet_sport, inet->inet_dport, sk); |
| 228 | if (IS_ERR(rt)) { |
| 229 | err = PTR_ERR(rt); |
| 230 | rt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | goto failure; |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 232 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | /* OK, now commit destination to socket. */ |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 234 | sk->sk_gso_type = SKB_GSO_TCPV4; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 235 | sk_setup_caps(sk, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 237 | if (!tp->write_seq && likely(!tp->repair)) |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 238 | tp->write_seq = secure_tcp_sequence_number(inet->inet_saddr, |
| 239 | inet->inet_daddr, |
| 240 | inet->inet_sport, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | usin->sin_port); |
| 242 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 243 | inet->inet_id = tp->write_seq ^ jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
Andrey Vagin | 2b91647 | 2012-11-22 01:13:58 +0000 | [diff] [blame] | 245 | err = tcp_connect(sk); |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | rt = NULL; |
| 248 | if (err) |
| 249 | goto failure; |
| 250 | |
| 251 | return 0; |
| 252 | |
| 253 | failure: |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 254 | /* |
| 255 | * This unhashes the socket and releases the local port, |
| 256 | * if necessary. |
| 257 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | tcp_set_state(sk, TCP_CLOSE); |
| 259 | ip_rt_put(rt); |
| 260 | sk->sk_route_caps = 0; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 261 | inet->inet_dport = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | return err; |
| 263 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 264 | EXPORT_SYMBOL(tcp_v4_connect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | /* |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 267 | * This routine reacts to ICMP_FRAG_NEEDED mtu indications as defined in RFC1191. |
| 268 | * It can be called through tcp_release_cb() if socket was owned by user |
| 269 | * at the time tcp_v4_err() was called to handle ICMP message. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | */ |
Neal Cardwell | 4fab907 | 2014-08-14 12:40:05 -0400 | [diff] [blame] | 271 | void tcp_v4_mtu_reduced(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | { |
| 273 | struct dst_entry *dst; |
| 274 | struct inet_sock *inet = inet_sk(sk); |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 275 | u32 mtu = tcp_sk(sk)->mtu_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | |
David S. Miller | 80d0a69 | 2012-07-16 03:28:06 -0700 | [diff] [blame] | 277 | dst = inet_csk_update_pmtu(sk, mtu); |
| 278 | if (!dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | return; |
| 280 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | /* Something is about to be wrong... Remember soft error |
| 282 | * for the case, if this connection will not able to recover. |
| 283 | */ |
| 284 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) |
| 285 | sk->sk_err_soft = EMSGSIZE; |
| 286 | |
| 287 | mtu = dst_mtu(dst); |
| 288 | |
| 289 | if (inet->pmtudisc != IP_PMTUDISC_DONT && |
Hannes Frederic Sowa | 482fc60 | 2013-11-05 02:24:17 +0100 | [diff] [blame] | 290 | ip_sk_accept_pmtu(sk) && |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 291 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | tcp_sync_mss(sk, mtu); |
| 293 | |
| 294 | /* Resend the TCP packet because it's |
| 295 | * clear that the old packet has been |
| 296 | * dropped. This is the new "fast" path mtu |
| 297 | * discovery. |
| 298 | */ |
| 299 | tcp_simple_retransmit(sk); |
| 300 | } /* else let the usual retransmit timer handle it */ |
| 301 | } |
Neal Cardwell | 4fab907 | 2014-08-14 12:40:05 -0400 | [diff] [blame] | 302 | EXPORT_SYMBOL(tcp_v4_mtu_reduced); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 304 | static void do_redirect(struct sk_buff *skb, struct sock *sk) |
| 305 | { |
| 306 | struct dst_entry *dst = __sk_dst_check(sk, 0); |
| 307 | |
David S. Miller | 1ed5c48 | 2012-07-12 00:41:25 -0700 | [diff] [blame] | 308 | if (dst) |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 309 | dst->ops->redirect(dst, sk, skb); |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 310 | } |
| 311 | |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 312 | |
| 313 | /* handle ICMP messages on TCP_NEW_SYN_RECV request sockets */ |
| 314 | void tcp_req_err(struct sock *sk, u32 seq) |
| 315 | { |
| 316 | struct request_sock *req = inet_reqsk(sk); |
| 317 | struct net *net = sock_net(sk); |
| 318 | |
| 319 | /* ICMPs are not backlogged, hence we cannot get |
| 320 | * an established socket here. |
| 321 | */ |
| 322 | WARN_ON(req->sk); |
| 323 | |
| 324 | if (seq != tcp_rsk(req)->snt_isn) { |
| 325 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
| 326 | } else { |
| 327 | /* |
| 328 | * Still in SYN_RECV, just remove it silently. |
| 329 | * There is no good way to pass the error to the newly |
| 330 | * created socket, and POSIX does not want network |
| 331 | * errors returned from accept(). |
| 332 | */ |
Fan Du | c697366 | 2015-03-23 15:00:41 -0700 | [diff] [blame] | 333 | inet_csk_reqsk_queue_drop(req->rsk_listener, req); |
Eric Dumazet | ef84d8c | 2015-10-14 11:16:26 -0700 | [diff] [blame] | 334 | NET_INC_STATS_BH(net, LINUX_MIB_LISTENDROPS); |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 335 | } |
Eric Dumazet | ef84d8c | 2015-10-14 11:16:26 -0700 | [diff] [blame] | 336 | reqsk_put(req); |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 337 | } |
| 338 | EXPORT_SYMBOL(tcp_req_err); |
| 339 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | /* |
| 341 | * This routine is called by the ICMP module when it gets some |
| 342 | * sort of error condition. If err < 0 then the socket should |
| 343 | * be closed and the error returned to the user. If err > 0 |
| 344 | * it's just the icmp type << 8 | icmp code. After adjustment |
| 345 | * header points to the first 8 bytes of the tcp header. We need |
| 346 | * to find the appropriate port. |
| 347 | * |
| 348 | * The locking strategy used here is very "optimistic". When |
| 349 | * someone else accesses the socket the ICMP is just dropped |
| 350 | * and for some paths there is no check at all. |
| 351 | * A more general error queue to queue errors for later handling |
| 352 | * is probably better. |
| 353 | * |
| 354 | */ |
| 355 | |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 356 | void tcp_v4_err(struct sk_buff *icmp_skb, u32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 358 | const struct iphdr *iph = (const struct iphdr *)icmp_skb->data; |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 359 | struct tcphdr *th = (struct tcphdr *)(icmp_skb->data + (iph->ihl << 2)); |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 360 | struct inet_connection_sock *icsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | struct tcp_sock *tp; |
| 362 | struct inet_sock *inet; |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 363 | const int type = icmp_hdr(icmp_skb)->type; |
| 364 | const int code = icmp_hdr(icmp_skb)->code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | struct sock *sk; |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 366 | struct sk_buff *skb; |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 367 | struct request_sock *fastopen; |
| 368 | __u32 seq, snd_una; |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 369 | __u32 remaining; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | int err; |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 371 | struct net *net = dev_net(icmp_skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 373 | sk = __inet_lookup_established(net, &tcp_hashinfo, iph->daddr, |
| 374 | th->dest, iph->saddr, ntohs(th->source), |
| 375 | inet_iif(icmp_skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | if (!sk) { |
Pavel Emelyanov | dcfc23c | 2008-07-14 23:03:00 -0700 | [diff] [blame] | 377 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | return; |
| 379 | } |
| 380 | if (sk->sk_state == TCP_TIME_WAIT) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 381 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | return; |
| 383 | } |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 384 | seq = ntohl(th->seq); |
| 385 | if (sk->sk_state == TCP_NEW_SYN_RECV) |
| 386 | return tcp_req_err(sk, seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | |
| 388 | bh_lock_sock(sk); |
| 389 | /* If too many ICMPs get dropped on busy |
| 390 | * servers this needs to be solved differently. |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 391 | * We do take care of PMTU discovery (RFC1191) special case : |
| 392 | * we can receive locally generated ICMP messages while socket is held. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | */ |
Eric Dumazet | b74aa93 | 2013-01-19 16:10:37 +0000 | [diff] [blame] | 394 | if (sock_owned_by_user(sk)) { |
| 395 | if (!(type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)) |
| 396 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
| 397 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | if (sk->sk_state == TCP_CLOSE) |
| 399 | goto out; |
| 400 | |
stephen hemminger | 97e3ecd1 | 2010-03-18 11:27:32 +0000 | [diff] [blame] | 401 | if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { |
| 402 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); |
| 403 | goto out; |
| 404 | } |
| 405 | |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 406 | icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | tp = tcp_sk(sk); |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 408 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
| 409 | fastopen = tp->fastopen_rsk; |
| 410 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | if (sk->sk_state != TCP_LISTEN && |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 412 | !between(seq, snd_una, tp->snd_nxt)) { |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 413 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | goto out; |
| 415 | } |
| 416 | |
| 417 | switch (type) { |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 418 | case ICMP_REDIRECT: |
| 419 | do_redirect(icmp_skb, sk); |
| 420 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | case ICMP_SOURCE_QUENCH: |
| 422 | /* Just silently ignore these. */ |
| 423 | goto out; |
| 424 | case ICMP_PARAMETERPROB: |
| 425 | err = EPROTO; |
| 426 | break; |
| 427 | case ICMP_DEST_UNREACH: |
| 428 | if (code > NR_ICMP_UNREACH) |
| 429 | goto out; |
| 430 | |
| 431 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ |
Eric Dumazet | 0d4f060 | 2013-03-18 07:01:28 +0000 | [diff] [blame] | 432 | /* We are not interested in TCP_LISTEN and open_requests |
| 433 | * (SYN-ACKs send out by Linux are always <576bytes so |
| 434 | * they should go through unfragmented). |
| 435 | */ |
| 436 | if (sk->sk_state == TCP_LISTEN) |
| 437 | goto out; |
| 438 | |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 439 | tp->mtu_info = info; |
Eric Dumazet | 144d56e | 2012-08-20 00:22:46 +0000 | [diff] [blame] | 440 | if (!sock_owned_by_user(sk)) { |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 441 | tcp_v4_mtu_reduced(sk); |
Eric Dumazet | 144d56e | 2012-08-20 00:22:46 +0000 | [diff] [blame] | 442 | } else { |
| 443 | if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, &tp->tsq_flags)) |
| 444 | sock_hold(sk); |
| 445 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | goto out; |
| 447 | } |
| 448 | |
| 449 | err = icmp_err_convert[code].errno; |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 450 | /* check if icmp_skb allows revert of backoff |
| 451 | * (see draft-zimmermann-tcp-lcd) */ |
| 452 | if (code != ICMP_NET_UNREACH && code != ICMP_HOST_UNREACH) |
| 453 | break; |
| 454 | if (seq != tp->snd_una || !icsk->icsk_retransmits || |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 455 | !icsk->icsk_backoff || fastopen) |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 456 | break; |
| 457 | |
David S. Miller | 8f49c27 | 2010-11-12 13:35:00 -0800 | [diff] [blame] | 458 | if (sock_owned_by_user(sk)) |
| 459 | break; |
| 460 | |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 461 | icsk->icsk_backoff--; |
Eric Dumazet | fcdd1cf | 2014-09-22 13:19:44 -0700 | [diff] [blame] | 462 | icsk->icsk_rto = tp->srtt_us ? __tcp_set_rto(tp) : |
| 463 | TCP_TIMEOUT_INIT; |
| 464 | icsk->icsk_rto = inet_csk_rto_backoff(icsk, TCP_RTO_MAX); |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 465 | |
| 466 | skb = tcp_write_queue_head(sk); |
| 467 | BUG_ON(!skb); |
| 468 | |
Eric Dumazet | 7faee5c | 2014-09-05 15:33:33 -0700 | [diff] [blame] | 469 | remaining = icsk->icsk_rto - |
| 470 | min(icsk->icsk_rto, |
| 471 | tcp_time_stamp - tcp_skb_timestamp(skb)); |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 472 | |
| 473 | if (remaining) { |
| 474 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, |
| 475 | remaining, TCP_RTO_MAX); |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 476 | } else { |
| 477 | /* RTO revert clocked out retransmission. |
| 478 | * Will retransmit now */ |
| 479 | tcp_retransmit_timer(sk); |
| 480 | } |
| 481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | break; |
| 483 | case ICMP_TIME_EXCEEDED: |
| 484 | err = EHOSTUNREACH; |
| 485 | break; |
| 486 | default: |
| 487 | goto out; |
| 488 | } |
| 489 | |
| 490 | switch (sk->sk_state) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | case TCP_SYN_SENT: |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 492 | case TCP_SYN_RECV: |
| 493 | /* Only in fast or simultaneous open. If a fast open socket is |
| 494 | * is already accepted it is treated as a connected one below. |
| 495 | */ |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 496 | if (fastopen && !fastopen->sk) |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 497 | break; |
| 498 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | if (!sock_owned_by_user(sk)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | sk->sk_err = err; |
| 501 | |
| 502 | sk->sk_error_report(sk); |
| 503 | |
| 504 | tcp_done(sk); |
| 505 | } else { |
| 506 | sk->sk_err_soft = err; |
| 507 | } |
| 508 | goto out; |
| 509 | } |
| 510 | |
| 511 | /* If we've already connected we will keep trying |
| 512 | * until we time out, or the user gives up. |
| 513 | * |
| 514 | * rfc1122 4.2.3.9 allows to consider as hard errors |
| 515 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, |
| 516 | * but it is obsoleted by pmtu discovery). |
| 517 | * |
| 518 | * Note, that in modern internet, where routing is unreliable |
| 519 | * and in each dark corner broken firewalls sit, sending random |
| 520 | * errors ordered by their masters even this two messages finally lose |
| 521 | * their original sense (even Linux sends invalid PORT_UNREACHs) |
| 522 | * |
| 523 | * Now we are in compliance with RFCs. |
| 524 | * --ANK (980905) |
| 525 | */ |
| 526 | |
| 527 | inet = inet_sk(sk); |
| 528 | if (!sock_owned_by_user(sk) && inet->recverr) { |
| 529 | sk->sk_err = err; |
| 530 | sk->sk_error_report(sk); |
| 531 | } else { /* Only an error on timeout */ |
| 532 | sk->sk_err_soft = err; |
| 533 | } |
| 534 | |
| 535 | out: |
| 536 | bh_unlock_sock(sk); |
| 537 | sock_put(sk); |
| 538 | } |
| 539 | |
Daniel Borkmann | 28850dc | 2013-06-07 05:11:46 +0000 | [diff] [blame] | 540 | 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] | 541 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 542 | struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 544 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 545 | th->check = ~tcp_v4_check(skb->len, saddr, daddr, 0); |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 546 | skb->csum_start = skb_transport_header(skb) - skb->head; |
Al Viro | ff1dcad | 2006-11-20 18:07:29 -0800 | [diff] [blame] | 547 | skb->csum_offset = offsetof(struct tcphdr, check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | } else { |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 549 | th->check = tcp_v4_check(skb->len, saddr, daddr, |
Joe Perches | 07f0757 | 2008-11-19 15:44:53 -0800 | [diff] [blame] | 550 | csum_partial(th, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | th->doff << 2, |
| 552 | skb->csum)); |
| 553 | } |
| 554 | } |
| 555 | |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 556 | /* This routine computes an IPv4 TCP checksum. */ |
Herbert Xu | bb29624 | 2010-04-11 02:15:55 +0000 | [diff] [blame] | 557 | void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb) |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 558 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 559 | const struct inet_sock *inet = inet_sk(sk); |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 560 | |
| 561 | __tcp_v4_send_check(skb, inet->inet_saddr, inet->inet_daddr); |
| 562 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 563 | EXPORT_SYMBOL(tcp_v4_send_check); |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 564 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | /* |
| 566 | * This routine will send an RST to the other tcp. |
| 567 | * |
| 568 | * Someone asks: why I NEVER use socket parameters (TOS, TTL etc.) |
| 569 | * for reset. |
| 570 | * Answer: if a packet caused RST, it is not for a socket |
| 571 | * existing in our system, if it is matched to a socket, |
| 572 | * it is just duplicate segment or bug in other side's TCP. |
| 573 | * So that we build reply only basing on parameters |
| 574 | * arrived with segment. |
| 575 | * Exception: precedence violation. We do not implement it in any case. |
| 576 | */ |
| 577 | |
Eric Dumazet | a00e744 | 2015-09-29 07:42:39 -0700 | [diff] [blame] | 578 | 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] | 579 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 580 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 581 | struct { |
| 582 | struct tcphdr th; |
| 583 | #ifdef CONFIG_TCP_MD5SIG |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 584 | __be32 opt[(TCPOLEN_MD5SIG_ALIGNED >> 2)]; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 585 | #endif |
| 586 | } rep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | struct ip_reply_arg arg; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 588 | #ifdef CONFIG_TCP_MD5SIG |
Florian Westphal | e46787f | 2015-12-21 21:29:25 +0100 | [diff] [blame] | 589 | struct tcp_md5sig_key *key = NULL; |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 590 | const __u8 *hash_location = NULL; |
| 591 | unsigned char newhash[16]; |
| 592 | int genhash; |
| 593 | struct sock *sk1 = NULL; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 594 | #endif |
Pavel Emelyanov | a86b1e3 | 2008-07-16 20:20:58 -0700 | [diff] [blame] | 595 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | |
| 597 | /* Never send a reset in response to a reset. */ |
| 598 | if (th->rst) |
| 599 | return; |
| 600 | |
Eric Dumazet | c3658e8 | 2014-11-25 07:40:04 -0800 | [diff] [blame] | 601 | /* If sk not NULL, it means we did a successful lookup and incoming |
| 602 | * route had to be correct. prequeue might have dropped our dst. |
| 603 | */ |
| 604 | if (!sk && skb_rtable(skb)->rt_type != RTN_LOCAL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | return; |
| 606 | |
| 607 | /* Swap the send and the receive. */ |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 608 | memset(&rep, 0, sizeof(rep)); |
| 609 | rep.th.dest = th->source; |
| 610 | rep.th.source = th->dest; |
| 611 | rep.th.doff = sizeof(struct tcphdr) / 4; |
| 612 | rep.th.rst = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | |
| 614 | if (th->ack) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 615 | rep.th.seq = th->ack_seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 617 | rep.th.ack = 1; |
| 618 | rep.th.ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin + |
| 619 | skb->len - (th->doff << 2)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | } |
| 621 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 622 | memset(&arg, 0, sizeof(arg)); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 623 | arg.iov[0].iov_base = (unsigned char *)&rep; |
| 624 | arg.iov[0].iov_len = sizeof(rep.th); |
| 625 | |
Eric Dumazet | 0f85fea | 2014-12-09 09:56:08 -0800 | [diff] [blame] | 626 | net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 627 | #ifdef CONFIG_TCP_MD5SIG |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 628 | hash_location = tcp_parse_md5sig_option(th); |
Florian Westphal | 271c3b9 | 2015-12-21 21:29:26 +0100 | [diff] [blame] | 629 | if (sk && sk_fullsock(sk)) { |
Florian Westphal | e46787f | 2015-12-21 21:29:25 +0100 | [diff] [blame] | 630 | key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *) |
| 631 | &ip_hdr(skb)->saddr, AF_INET); |
| 632 | } else if (hash_location) { |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 633 | /* |
| 634 | * active side is lost. Try to find listening socket through |
| 635 | * source port, and then find md5 key through listening socket. |
| 636 | * we are not loose security here: |
| 637 | * Incoming packet is checked with md5 hash with finding key, |
| 638 | * no RST generated if md5 hash doesn't match. |
| 639 | */ |
Eric Dumazet | 0f85fea | 2014-12-09 09:56:08 -0800 | [diff] [blame] | 640 | sk1 = __inet_lookup_listener(net, |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 641 | &tcp_hashinfo, ip_hdr(skb)->saddr, |
| 642 | th->source, ip_hdr(skb)->daddr, |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 643 | ntohs(th->source), inet_iif(skb)); |
| 644 | /* don't send rst if it can't find key */ |
| 645 | if (!sk1) |
| 646 | return; |
| 647 | rcu_read_lock(); |
| 648 | key = tcp_md5_do_lookup(sk1, (union tcp_md5_addr *) |
| 649 | &ip_hdr(skb)->saddr, AF_INET); |
| 650 | if (!key) |
| 651 | goto release_sk1; |
| 652 | |
Eric Dumazet | 39f8e58 | 2015-03-24 15:58:55 -0700 | [diff] [blame] | 653 | genhash = tcp_v4_md5_hash_skb(newhash, key, NULL, skb); |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 654 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
| 655 | goto release_sk1; |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 656 | } |
| 657 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 658 | if (key) { |
| 659 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | |
| 660 | (TCPOPT_NOP << 16) | |
| 661 | (TCPOPT_MD5SIG << 8) | |
| 662 | TCPOLEN_MD5SIG); |
| 663 | /* Update length and the length the header thinks exists */ |
| 664 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; |
| 665 | rep.th.doff = arg.iov[0].iov_len / 4; |
| 666 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 667 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[1], |
Ilpo Järvinen | 78e645cb | 2008-10-09 14:37:47 -0700 | [diff] [blame] | 668 | key, ip_hdr(skb)->saddr, |
| 669 | ip_hdr(skb)->daddr, &rep.th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 670 | } |
| 671 | #endif |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 672 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
| 673 | ip_hdr(skb)->saddr, /* XXX */ |
Ilpo Järvinen | 52cd575 | 2008-10-08 11:34:06 -0700 | [diff] [blame] | 674 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; |
Florian Westphal | 271c3b9 | 2015-12-21 21:29:26 +0100 | [diff] [blame] | 676 | arg.flags = (sk && inet_sk_transparent(sk)) ? IP_REPLY_ARG_NOSRCCHECK : 0; |
| 677 | |
Shawn Lu | e2446ea | 2012-02-04 12:38:09 +0000 | [diff] [blame] | 678 | /* When socket is gone, all binding information is lost. |
Alexey Kuznetsov | 4c67525 | 2012-10-12 04:34:17 +0000 | [diff] [blame] | 679 | * routing might fail in this case. No choice here, if we choose to force |
| 680 | * input interface, we will misroute in case of asymmetric route. |
Shawn Lu | e2446ea | 2012-02-04 12:38:09 +0000 | [diff] [blame] | 681 | */ |
Alexey Kuznetsov | 4c67525 | 2012-10-12 04:34:17 +0000 | [diff] [blame] | 682 | if (sk) |
| 683 | arg.bound_dev_if = sk->sk_bound_dev_if; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
Florian Westphal | 271c3b9 | 2015-12-21 21:29:26 +0100 | [diff] [blame] | 685 | BUILD_BUG_ON(offsetof(struct sock, sk_bound_dev_if) != |
| 686 | offsetof(struct inet_timewait_sock, tw_bound_dev_if)); |
| 687 | |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 688 | arg.tos = ip_hdr(skb)->tos; |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 689 | ip_send_unicast_reply(*this_cpu_ptr(net->ipv4.tcp_sk), |
| 690 | skb, &TCP_SKB_CB(skb)->header.h4.opt, |
Eric Dumazet | 24a2d43 | 2014-09-27 09:50:55 -0700 | [diff] [blame] | 691 | ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, |
| 692 | &arg, arg.iov[0].iov_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 694 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
| 695 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 696 | |
| 697 | #ifdef CONFIG_TCP_MD5SIG |
| 698 | release_sk1: |
| 699 | if (sk1) { |
| 700 | rcu_read_unlock(); |
| 701 | sock_put(sk1); |
| 702 | } |
| 703 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | } |
| 705 | |
| 706 | /* The code following below sending ACKs in SYN-RECV and TIME-WAIT states |
| 707 | outside socket context is ugly, certainly. What can I do? |
| 708 | */ |
| 709 | |
Eric Dumazet | e62a123 | 2016-01-21 08:02:54 -0800 | [diff] [blame] | 710 | static void tcp_v4_send_ack(struct net *net, |
| 711 | struct sk_buff *skb, u32 seq, u32 ack, |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 712 | u32 win, u32 tsval, u32 tsecr, int oif, |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 713 | struct tcp_md5sig_key *key, |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 714 | int reply_flags, u8 tos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 716 | const struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | struct { |
| 718 | struct tcphdr th; |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 719 | __be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 720 | #ifdef CONFIG_TCP_MD5SIG |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 721 | + (TCPOLEN_MD5SIG_ALIGNED >> 2) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 722 | #endif |
| 723 | ]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | } rep; |
| 725 | struct ip_reply_arg arg; |
| 726 | |
| 727 | memset(&rep.th, 0, sizeof(struct tcphdr)); |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 728 | memset(&arg, 0, sizeof(arg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | |
| 730 | arg.iov[0].iov_base = (unsigned char *)&rep; |
| 731 | arg.iov[0].iov_len = sizeof(rep.th); |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 732 | if (tsecr) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 733 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| 734 | (TCPOPT_TIMESTAMP << 8) | |
| 735 | TCPOLEN_TIMESTAMP); |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 736 | rep.opt[1] = htonl(tsval); |
| 737 | rep.opt[2] = htonl(tsecr); |
Craig Schlenter | cb48cfe | 2007-01-09 00:11:15 -0800 | [diff] [blame] | 738 | arg.iov[0].iov_len += TCPOLEN_TSTAMP_ALIGNED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | } |
| 740 | |
| 741 | /* Swap the send and the receive. */ |
| 742 | rep.th.dest = th->source; |
| 743 | rep.th.source = th->dest; |
| 744 | rep.th.doff = arg.iov[0].iov_len / 4; |
| 745 | rep.th.seq = htonl(seq); |
| 746 | rep.th.ack_seq = htonl(ack); |
| 747 | rep.th.ack = 1; |
| 748 | rep.th.window = htons(win); |
| 749 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 750 | #ifdef CONFIG_TCP_MD5SIG |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 751 | if (key) { |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 752 | int offset = (tsecr) ? 3 : 0; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 753 | |
| 754 | rep.opt[offset++] = htonl((TCPOPT_NOP << 24) | |
| 755 | (TCPOPT_NOP << 16) | |
| 756 | (TCPOPT_MD5SIG << 8) | |
| 757 | TCPOLEN_MD5SIG); |
| 758 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; |
| 759 | rep.th.doff = arg.iov[0].iov_len/4; |
| 760 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 761 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[offset], |
Adam Langley | 90b7e11 | 2008-07-31 20:49:48 -0700 | [diff] [blame] | 762 | key, ip_hdr(skb)->saddr, |
| 763 | ip_hdr(skb)->daddr, &rep.th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 764 | } |
| 765 | #endif |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 766 | arg.flags = reply_flags; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 767 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
| 768 | ip_hdr(skb)->saddr, /* XXX */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
| 770 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 771 | if (oif) |
| 772 | arg.bound_dev_if = oif; |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 773 | arg.tos = tos; |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 774 | ip_send_unicast_reply(*this_cpu_ptr(net->ipv4.tcp_sk), |
| 775 | skb, &TCP_SKB_CB(skb)->header.h4.opt, |
Eric Dumazet | 24a2d43 | 2014-09-27 09:50:55 -0700 | [diff] [blame] | 776 | ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, |
| 777 | &arg, arg.iov[0].iov_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 779 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | } |
| 781 | |
| 782 | static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) |
| 783 | { |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 784 | struct inet_timewait_sock *tw = inet_twsk(sk); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 785 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | |
Eric Dumazet | e62a123 | 2016-01-21 08:02:54 -0800 | [diff] [blame] | 787 | tcp_v4_send_ack(sock_net(sk), skb, |
| 788 | tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 789 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 790 | tcp_time_stamp + tcptw->tw_ts_offset, |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 791 | tcptw->tw_ts_recent, |
| 792 | tw->tw_bound_dev_if, |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 793 | tcp_twsk_md5_key(tcptw), |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 794 | tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0, |
| 795 | tw->tw_tos |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 796 | ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 798 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | } |
| 800 | |
Eric Dumazet | a00e744 | 2015-09-29 07:42:39 -0700 | [diff] [blame] | 801 | 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] | 802 | struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | { |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 804 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
| 805 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. |
| 806 | */ |
Eric Dumazet | e62a123 | 2016-01-21 08:02:54 -0800 | [diff] [blame] | 807 | u32 seq = (sk->sk_state == TCP_LISTEN) ? tcp_rsk(req)->snt_isn + 1 : |
| 808 | tcp_sk(sk)->snd_nxt; |
| 809 | |
| 810 | tcp_v4_send_ack(sock_net(sk), skb, seq, |
Eric Dumazet | ed53d0a | 2015-10-08 19:33:23 -0700 | [diff] [blame] | 811 | tcp_rsk(req)->rcv_nxt, req->rsk_rcv_wnd, |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 812 | tcp_time_stamp, |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 813 | req->ts_recent, |
| 814 | 0, |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 815 | tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&ip_hdr(skb)->daddr, |
| 816 | AF_INET), |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 817 | inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0, |
| 818 | ip_hdr(skb)->tos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | } |
| 820 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | /* |
Kris Katterjohn | 9bf1d83 | 2008-02-17 22:29:19 -0800 | [diff] [blame] | 822 | * Send a SYN-ACK after having received a SYN. |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 823 | * This still operates on a request_sock only, not on a big |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | * socket. |
| 825 | */ |
Eric Dumazet | 0f935dbe | 2015-09-25 07:39:21 -0700 | [diff] [blame] | 826 | 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] | 827 | struct flowi *fl, |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 828 | struct request_sock *req, |
Eric Dumazet | ca6fb06 | 2015-10-02 11:43:35 -0700 | [diff] [blame] | 829 | struct tcp_fastopen_cookie *foc, |
| 830 | bool attach_req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 832 | const struct inet_request_sock *ireq = inet_rsk(req); |
David S. Miller | 6bd023f | 2011-05-18 18:32:03 -0400 | [diff] [blame] | 833 | struct flowi4 fl4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | int err = -1; |
Weilong Chen | d41db5a | 2013-12-23 14:37:28 +0800 | [diff] [blame] | 835 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | |
| 837 | /* First, grab a route. */ |
David S. Miller | ba3f7f0 | 2012-07-17 14:02:46 -0700 | [diff] [blame] | 838 | if (!dst && (dst = inet_csk_route_req(sk, &fl4, req)) == NULL) |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 839 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | |
Eric Dumazet | ca6fb06 | 2015-10-02 11:43:35 -0700 | [diff] [blame] | 841 | skb = tcp_make_synack(sk, dst, req, foc, attach_req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
| 843 | if (skb) { |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 844 | __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] | 845 | |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 846 | err = ip_build_and_send_pkt(skb, sk, ireq->ir_loc_addr, |
| 847 | ireq->ir_rmt_addr, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 848 | ireq->opt); |
Gerrit Renker | b9df3cb | 2006-11-14 11:21:36 -0200 | [diff] [blame] | 849 | err = net_xmit_eval(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | } |
| 851 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | return err; |
| 853 | } |
| 854 | |
| 855 | /* |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 856 | * IPv4 request_sock destructor. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | */ |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 858 | static void tcp_v4_reqsk_destructor(struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | { |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 860 | kfree(inet_rsk(req)->opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | } |
| 862 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 864 | #ifdef CONFIG_TCP_MD5SIG |
| 865 | /* |
| 866 | * RFC2385 MD5 checksumming requires a mapping of |
| 867 | * IP address->MD5 Key. |
| 868 | * We need to maintain these in the sk structure. |
| 869 | */ |
| 870 | |
| 871 | /* Find the Key structure for an address. */ |
Eric Dumazet | b83e3de | 2015-09-25 07:39:15 -0700 | [diff] [blame] | 872 | struct tcp_md5sig_key *tcp_md5_do_lookup(const struct sock *sk, |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 873 | const union tcp_md5_addr *addr, |
| 874 | int family) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 875 | { |
Eric Dumazet | fd3a154 | 2015-03-24 15:58:56 -0700 | [diff] [blame] | 876 | const struct tcp_sock *tp = tcp_sk(sk); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 877 | struct tcp_md5sig_key *key; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 878 | unsigned int size = sizeof(struct in_addr); |
Eric Dumazet | fd3a154 | 2015-03-24 15:58:56 -0700 | [diff] [blame] | 879 | const struct tcp_md5sig_info *md5sig; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 880 | |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 881 | /* caller either holds rcu_read_lock() or socket lock */ |
| 882 | md5sig = rcu_dereference_check(tp->md5sig_info, |
Eric Dumazet | b4fb05e | 2012-03-07 04:45:43 +0000 | [diff] [blame] | 883 | sock_owned_by_user(sk) || |
Eric Dumazet | b83e3de | 2015-09-25 07:39:15 -0700 | [diff] [blame] | 884 | lockdep_is_held((spinlock_t *)&sk->sk_lock.slock)); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 885 | if (!md5sig) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 886 | return NULL; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 887 | #if IS_ENABLED(CONFIG_IPV6) |
| 888 | if (family == AF_INET6) |
| 889 | size = sizeof(struct in6_addr); |
| 890 | #endif |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 891 | hlist_for_each_entry_rcu(key, &md5sig->head, node) { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 892 | if (key->family != family) |
| 893 | continue; |
| 894 | if (!memcmp(&key->addr, addr, size)) |
| 895 | return key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 896 | } |
| 897 | return NULL; |
| 898 | } |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 899 | EXPORT_SYMBOL(tcp_md5_do_lookup); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 900 | |
Eric Dumazet | b83e3de | 2015-09-25 07:39:15 -0700 | [diff] [blame] | 901 | struct tcp_md5sig_key *tcp_v4_md5_lookup(const struct sock *sk, |
Eric Dumazet | fd3a154 | 2015-03-24 15:58:56 -0700 | [diff] [blame] | 902 | const struct sock *addr_sk) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 903 | { |
Eric Dumazet | b52e692 | 2015-04-09 14:36:42 -0700 | [diff] [blame] | 904 | const union tcp_md5_addr *addr; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 905 | |
Eric Dumazet | b52e692 | 2015-04-09 14:36:42 -0700 | [diff] [blame] | 906 | addr = (const union tcp_md5_addr *)&addr_sk->sk_daddr; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 907 | return tcp_md5_do_lookup(sk, addr, AF_INET); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 908 | } |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 909 | EXPORT_SYMBOL(tcp_v4_md5_lookup); |
| 910 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 911 | /* This can be called on a newly created socket, from other files */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 912 | int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr, |
| 913 | int family, const u8 *newkey, u8 newkeylen, gfp_t gfp) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 914 | { |
| 915 | /* Add Key to the list */ |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 916 | struct tcp_md5sig_key *key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 917 | struct tcp_sock *tp = tcp_sk(sk); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 918 | struct tcp_md5sig_info *md5sig; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 919 | |
Aydin Arik | c0353c7 | 2013-06-14 18:56:31 +1200 | [diff] [blame] | 920 | key = tcp_md5_do_lookup(sk, addr, family); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 921 | if (key) { |
| 922 | /* Pre-existing entry - just update that one. */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 923 | memcpy(key->key, newkey, newkeylen); |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 924 | key->keylen = newkeylen; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 925 | return 0; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 926 | } |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 927 | |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 928 | md5sig = rcu_dereference_protected(tp->md5sig_info, |
Eric Dumazet | 1b8e6a0 | 2015-11-18 12:40:13 -0800 | [diff] [blame] | 929 | sock_owned_by_user(sk) || |
| 930 | lockdep_is_held(&sk->sk_lock.slock)); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 931 | if (!md5sig) { |
| 932 | md5sig = kmalloc(sizeof(*md5sig), gfp); |
| 933 | if (!md5sig) |
| 934 | return -ENOMEM; |
| 935 | |
| 936 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
| 937 | INIT_HLIST_HEAD(&md5sig->head); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 938 | rcu_assign_pointer(tp->md5sig_info, md5sig); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 939 | } |
| 940 | |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 941 | key = sock_kmalloc(sk, sizeof(*key), gfp); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 942 | if (!key) |
| 943 | return -ENOMEM; |
Eric Dumazet | 71cea17 | 2013-05-20 06:52:26 +0000 | [diff] [blame] | 944 | if (!tcp_alloc_md5sig_pool()) { |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 945 | sock_kfree_s(sk, key, sizeof(*key)); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 946 | return -ENOMEM; |
| 947 | } |
| 948 | |
| 949 | memcpy(key->key, newkey, newkeylen); |
| 950 | key->keylen = newkeylen; |
| 951 | key->family = family; |
| 952 | memcpy(&key->addr, addr, |
| 953 | (family == AF_INET6) ? sizeof(struct in6_addr) : |
| 954 | sizeof(struct in_addr)); |
| 955 | hlist_add_head_rcu(&key->node, &md5sig->head); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 956 | return 0; |
| 957 | } |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 958 | EXPORT_SYMBOL(tcp_md5_do_add); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 959 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 960 | int tcp_md5_do_del(struct sock *sk, const union tcp_md5_addr *addr, int family) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 961 | { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 962 | struct tcp_md5sig_key *key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 963 | |
Aydin Arik | c0353c7 | 2013-06-14 18:56:31 +1200 | [diff] [blame] | 964 | key = tcp_md5_do_lookup(sk, addr, family); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 965 | if (!key) |
| 966 | return -ENOENT; |
| 967 | hlist_del_rcu(&key->node); |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 968 | atomic_sub(sizeof(*key), &sk->sk_omem_alloc); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 969 | kfree_rcu(key, rcu); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 970 | return 0; |
| 971 | } |
| 972 | EXPORT_SYMBOL(tcp_md5_do_del); |
| 973 | |
stephen hemminger | e0683e70 | 2012-10-26 14:31:40 +0000 | [diff] [blame] | 974 | static void tcp_clear_md5_list(struct sock *sk) |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 975 | { |
| 976 | struct tcp_sock *tp = tcp_sk(sk); |
| 977 | struct tcp_md5sig_key *key; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 978 | struct hlist_node *n; |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 979 | struct tcp_md5sig_info *md5sig; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 980 | |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 981 | md5sig = rcu_dereference_protected(tp->md5sig_info, 1); |
| 982 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 983 | hlist_for_each_entry_safe(key, n, &md5sig->head, node) { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 984 | hlist_del_rcu(&key->node); |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 985 | atomic_sub(sizeof(*key), &sk->sk_omem_alloc); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 986 | kfree_rcu(key, rcu); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 987 | } |
| 988 | } |
| 989 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 990 | static int tcp_v4_parse_md5_keys(struct sock *sk, char __user *optval, |
| 991 | int optlen) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 992 | { |
| 993 | struct tcp_md5sig cmd; |
| 994 | struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 995 | |
| 996 | if (optlen < sizeof(cmd)) |
| 997 | return -EINVAL; |
| 998 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 999 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1000 | return -EFAULT; |
| 1001 | |
| 1002 | if (sin->sin_family != AF_INET) |
| 1003 | return -EINVAL; |
| 1004 | |
Dmitry Popov | 64a124e | 2014-08-03 22:45:19 +0400 | [diff] [blame] | 1005 | if (!cmd.tcpm_keylen) |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1006 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr, |
| 1007 | AF_INET); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1008 | |
| 1009 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) |
| 1010 | return -EINVAL; |
| 1011 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1012 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr, |
| 1013 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, |
| 1014 | GFP_KERNEL); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1015 | } |
| 1016 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1017 | static int tcp_v4_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
| 1018 | __be32 daddr, __be32 saddr, int nbytes) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1019 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1020 | struct tcp4_pseudohdr *bp; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1021 | struct scatterlist sg; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1022 | |
| 1023 | bp = &hp->md5_blk.ip4; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1024 | |
| 1025 | /* |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1026 | * 1. the TCP pseudo-header (in the order: source IP address, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1027 | * destination IP address, zero-padded protocol number, and |
| 1028 | * segment length) |
| 1029 | */ |
| 1030 | bp->saddr = saddr; |
| 1031 | bp->daddr = daddr; |
| 1032 | bp->pad = 0; |
YOSHIFUJI Hideaki | 076fb72 | 2008-04-17 12:48:12 +0900 | [diff] [blame] | 1033 | bp->protocol = IPPROTO_TCP; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1034 | bp->len = cpu_to_be16(nbytes); |
David S. Miller | c7da57a | 2007-10-26 00:41:21 -0700 | [diff] [blame] | 1035 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1036 | sg_init_one(&sg, bp, sizeof(*bp)); |
| 1037 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); |
| 1038 | } |
| 1039 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1040 | 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] | 1041 | __be32 daddr, __be32 saddr, const struct tcphdr *th) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1042 | { |
| 1043 | struct tcp_md5sig_pool *hp; |
| 1044 | struct hash_desc *desc; |
| 1045 | |
| 1046 | hp = tcp_get_md5sig_pool(); |
| 1047 | if (!hp) |
| 1048 | goto clear_hash_noput; |
| 1049 | desc = &hp->md5_desc; |
| 1050 | |
| 1051 | if (crypto_hash_init(desc)) |
| 1052 | goto clear_hash; |
| 1053 | if (tcp_v4_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) |
| 1054 | goto clear_hash; |
| 1055 | if (tcp_md5_hash_header(hp, th)) |
| 1056 | goto clear_hash; |
| 1057 | if (tcp_md5_hash_key(hp, key)) |
| 1058 | goto clear_hash; |
| 1059 | if (crypto_hash_final(desc, md5_hash)) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1060 | goto clear_hash; |
| 1061 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1062 | tcp_put_md5sig_pool(); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1063 | return 0; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1064 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1065 | clear_hash: |
| 1066 | tcp_put_md5sig_pool(); |
| 1067 | clear_hash_noput: |
| 1068 | memset(md5_hash, 0, 16); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1069 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1070 | } |
| 1071 | |
Eric Dumazet | 39f8e58 | 2015-03-24 15:58:55 -0700 | [diff] [blame] | 1072 | int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key, |
| 1073 | const struct sock *sk, |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 1074 | const struct sk_buff *skb) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1075 | { |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1076 | struct tcp_md5sig_pool *hp; |
| 1077 | struct hash_desc *desc; |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 1078 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1079 | __be32 saddr, daddr; |
| 1080 | |
Eric Dumazet | 39f8e58 | 2015-03-24 15:58:55 -0700 | [diff] [blame] | 1081 | if (sk) { /* valid for establish/request sockets */ |
| 1082 | saddr = sk->sk_rcv_saddr; |
| 1083 | daddr = sk->sk_daddr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1084 | } else { |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1085 | const struct iphdr *iph = ip_hdr(skb); |
| 1086 | saddr = iph->saddr; |
| 1087 | daddr = iph->daddr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1088 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1089 | |
| 1090 | hp = tcp_get_md5sig_pool(); |
| 1091 | if (!hp) |
| 1092 | goto clear_hash_noput; |
| 1093 | desc = &hp->md5_desc; |
| 1094 | |
| 1095 | if (crypto_hash_init(desc)) |
| 1096 | goto clear_hash; |
| 1097 | |
| 1098 | if (tcp_v4_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) |
| 1099 | goto clear_hash; |
| 1100 | if (tcp_md5_hash_header(hp, th)) |
| 1101 | goto clear_hash; |
| 1102 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) |
| 1103 | goto clear_hash; |
| 1104 | if (tcp_md5_hash_key(hp, key)) |
| 1105 | goto clear_hash; |
| 1106 | if (crypto_hash_final(desc, md5_hash)) |
| 1107 | goto clear_hash; |
| 1108 | |
| 1109 | tcp_put_md5sig_pool(); |
| 1110 | return 0; |
| 1111 | |
| 1112 | clear_hash: |
| 1113 | tcp_put_md5sig_pool(); |
| 1114 | clear_hash_noput: |
| 1115 | memset(md5_hash, 0, 16); |
| 1116 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1117 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1118 | EXPORT_SYMBOL(tcp_v4_md5_hash_skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1119 | |
Eric Dumazet | ba8e275 | 2015-10-02 11:43:28 -0700 | [diff] [blame] | 1120 | #endif |
| 1121 | |
Eric Dumazet | ff74e23 | 2015-03-24 15:58:54 -0700 | [diff] [blame] | 1122 | /* Called with rcu_read_lock() */ |
Eric Dumazet | ba8e275 | 2015-10-02 11:43:28 -0700 | [diff] [blame] | 1123 | static bool tcp_v4_inbound_md5_hash(const struct sock *sk, |
Eric Dumazet | ff74e23 | 2015-03-24 15:58:54 -0700 | [diff] [blame] | 1124 | const struct sk_buff *skb) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1125 | { |
Eric Dumazet | ba8e275 | 2015-10-02 11:43:28 -0700 | [diff] [blame] | 1126 | #ifdef CONFIG_TCP_MD5SIG |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1127 | /* |
| 1128 | * This gets called for each TCP segment that arrives |
| 1129 | * so we want to be efficient. |
| 1130 | * We have 3 drop cases: |
| 1131 | * o No MD5 hash and one expected. |
| 1132 | * o MD5 hash and we're not expecting one. |
| 1133 | * o MD5 hash and its wrong. |
| 1134 | */ |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1135 | const __u8 *hash_location = NULL; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1136 | struct tcp_md5sig_key *hash_expected; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1137 | const struct iphdr *iph = ip_hdr(skb); |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1138 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1139 | int genhash; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1140 | unsigned char newhash[16]; |
| 1141 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1142 | hash_expected = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&iph->saddr, |
| 1143 | AF_INET); |
YOSHIFUJI Hideaki | 7d5d552 | 2008-04-17 12:29:53 +0900 | [diff] [blame] | 1144 | hash_location = tcp_parse_md5sig_option(th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1145 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1146 | /* We've parsed the options - do we have a hash? */ |
| 1147 | if (!hash_expected && !hash_location) |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1148 | return false; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1149 | |
| 1150 | if (hash_expected && !hash_location) { |
David S. Miller | 785957d | 2008-07-30 03:03:15 -0700 | [diff] [blame] | 1151 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1152 | return true; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1153 | } |
| 1154 | |
| 1155 | if (!hash_expected && hash_location) { |
David S. Miller | 785957d | 2008-07-30 03:03:15 -0700 | [diff] [blame] | 1156 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1157 | return true; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1158 | } |
| 1159 | |
| 1160 | /* Okay, so this is hash_expected and hash_location - |
| 1161 | * so we need to calculate the checksum. |
| 1162 | */ |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1163 | genhash = tcp_v4_md5_hash_skb(newhash, |
| 1164 | hash_expected, |
Eric Dumazet | 39f8e58 | 2015-03-24 15:58:55 -0700 | [diff] [blame] | 1165 | NULL, skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1166 | |
| 1167 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1168 | net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s\n", |
| 1169 | &iph->saddr, ntohs(th->source), |
| 1170 | &iph->daddr, ntohs(th->dest), |
| 1171 | genhash ? " tcp_v4_calc_md5_hash failed" |
| 1172 | : ""); |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1173 | return true; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1174 | } |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1175 | return false; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1176 | #endif |
Eric Dumazet | ba8e275 | 2015-10-02 11:43:28 -0700 | [diff] [blame] | 1177 | return false; |
| 1178 | } |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1179 | |
Eric Dumazet | b40cf18 | 2015-09-25 07:39:08 -0700 | [diff] [blame] | 1180 | static void tcp_v4_init_req(struct request_sock *req, |
| 1181 | const struct sock *sk_listener, |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 1182 | struct sk_buff *skb) |
| 1183 | { |
| 1184 | struct inet_request_sock *ireq = inet_rsk(req); |
| 1185 | |
Eric Dumazet | 08d2cc3b | 2015-03-18 14:05:38 -0700 | [diff] [blame] | 1186 | sk_rcv_saddr_set(req_to_sk(req), ip_hdr(skb)->daddr); |
| 1187 | sk_daddr_set(req_to_sk(req), ip_hdr(skb)->saddr); |
| 1188 | ireq->no_srccheck = inet_sk(sk_listener)->transparent; |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 1189 | ireq->opt = tcp_v4_save_options(skb); |
| 1190 | } |
| 1191 | |
Eric Dumazet | f964629 | 2015-09-29 07:42:50 -0700 | [diff] [blame] | 1192 | static struct dst_entry *tcp_v4_route_req(const struct sock *sk, |
| 1193 | struct flowi *fl, |
Octavian Purdila | d94e041 | 2014-06-25 17:09:55 +0300 | [diff] [blame] | 1194 | const struct request_sock *req, |
| 1195 | bool *strict) |
| 1196 | { |
| 1197 | struct dst_entry *dst = inet_csk_route_req(sk, &fl->u.ip4, req); |
| 1198 | |
| 1199 | if (strict) { |
| 1200 | if (fl->u.ip4.daddr == inet_rsk(req)->ir_rmt_addr) |
| 1201 | *strict = true; |
| 1202 | else |
| 1203 | *strict = false; |
| 1204 | } |
| 1205 | |
| 1206 | return dst; |
| 1207 | } |
| 1208 | |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 1209 | struct request_sock_ops tcp_request_sock_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | .family = PF_INET, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1211 | .obj_size = sizeof(struct tcp_request_sock), |
Octavian Purdila | 5db92c9 | 2014-06-25 17:09:59 +0300 | [diff] [blame] | 1212 | .rtx_syn_ack = tcp_rtx_synack, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1213 | .send_ack = tcp_v4_reqsk_send_ack, |
| 1214 | .destructor = tcp_v4_reqsk_destructor, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | .send_reset = tcp_v4_send_reset, |
stephen hemminger | 688d194 | 2014-08-29 23:32:05 -0700 | [diff] [blame] | 1216 | .syn_ack_timeout = tcp_syn_ack_timeout, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | }; |
| 1218 | |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 1219 | static const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = { |
Octavian Purdila | 2aec4a2 | 2014-06-25 17:10:00 +0300 | [diff] [blame] | 1220 | .mss_clamp = TCP_MSS_DEFAULT, |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 1221 | #ifdef CONFIG_TCP_MD5SIG |
Eric Dumazet | fd3a154 | 2015-03-24 15:58:56 -0700 | [diff] [blame] | 1222 | .req_md5_lookup = tcp_v4_md5_lookup, |
John Dykstra | e3afe7b | 2009-07-16 05:04:51 +0000 | [diff] [blame] | 1223 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 1224 | #endif |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 1225 | .init_req = tcp_v4_init_req, |
Octavian Purdila | fb7b37a | 2014-06-25 17:09:54 +0300 | [diff] [blame] | 1226 | #ifdef CONFIG_SYN_COOKIES |
| 1227 | .cookie_init_seq = cookie_v4_init_sequence, |
| 1228 | #endif |
Octavian Purdila | d94e041 | 2014-06-25 17:09:55 +0300 | [diff] [blame] | 1229 | .route_req = tcp_v4_route_req, |
Octavian Purdila | 936b8bd | 2014-06-25 17:09:57 +0300 | [diff] [blame] | 1230 | .init_seq = tcp_v4_init_sequence, |
Octavian Purdila | d6274bd | 2014-06-25 17:09:58 +0300 | [diff] [blame] | 1231 | .send_synack = tcp_v4_send_synack, |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 1232 | }; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1233 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) |
| 1235 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | /* Never answer to SYNs send to broadcast or multicast */ |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 1237 | if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | goto drop; |
| 1239 | |
Octavian Purdila | 1fb6f15 | 2014-06-25 17:10:02 +0300 | [diff] [blame] | 1240 | return tcp_conn_request(&tcp_request_sock_ops, |
| 1241 | &tcp_request_sock_ipv4_ops, sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | drop: |
Vijay Subramanian | 848bf15 | 2013-01-31 08:24:06 +0000 | [diff] [blame] | 1244 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | return 0; |
| 1246 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1247 | EXPORT_SYMBOL(tcp_v4_conn_request); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | |
| 1249 | |
| 1250 | /* |
| 1251 | * The three way handshake has completed - we got a valid synack - |
| 1252 | * now create the new socket. |
| 1253 | */ |
Eric Dumazet | 0c27171 | 2015-09-29 07:42:48 -0700 | [diff] [blame] | 1254 | 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] | 1255 | struct request_sock *req, |
Eric Dumazet | 5e0724d | 2015-10-22 08:20:46 -0700 | [diff] [blame] | 1256 | struct dst_entry *dst, |
| 1257 | struct request_sock *req_unhash, |
| 1258 | bool *own_req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1260 | struct inet_request_sock *ireq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | struct inet_sock *newinet; |
| 1262 | struct tcp_sock *newtp; |
| 1263 | struct sock *newsk; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1264 | #ifdef CONFIG_TCP_MD5SIG |
| 1265 | struct tcp_md5sig_key *key; |
| 1266 | #endif |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1267 | struct ip_options_rcu *inet_opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | |
| 1269 | if (sk_acceptq_is_full(sk)) |
| 1270 | goto exit_overflow; |
| 1271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | newsk = tcp_create_openreq_child(sk, req, skb); |
| 1273 | if (!newsk) |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1274 | goto exit_nonewsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 1276 | newsk->sk_gso_type = SKB_GSO_TCPV4; |
Neal Cardwell | fae6ef8 | 2012-08-19 03:30:38 +0000 | [diff] [blame] | 1277 | inet_sk_rx_dst_set(newsk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | |
| 1279 | newtp = tcp_sk(newsk); |
| 1280 | newinet = inet_sk(newsk); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1281 | ireq = inet_rsk(req); |
Eric Dumazet | d1e559d | 2015-03-18 14:05:35 -0700 | [diff] [blame] | 1282 | sk_daddr_set(newsk, ireq->ir_rmt_addr); |
| 1283 | sk_rcv_saddr_set(newsk, ireq->ir_loc_addr); |
David Ahern | 6dd9a14 | 2015-12-16 13:20:44 -0800 | [diff] [blame] | 1284 | newsk->sk_bound_dev_if = ireq->ir_iif; |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 1285 | newinet->inet_saddr = ireq->ir_loc_addr; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1286 | inet_opt = ireq->opt; |
| 1287 | rcu_assign_pointer(newinet->inet_opt, inet_opt); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1288 | ireq->opt = NULL; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1289 | newinet->mc_index = inet_iif(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1290 | newinet->mc_ttl = ip_hdr(skb)->ttl; |
Jiri Benc | 4c507d2 | 2012-02-09 09:35:49 +0000 | [diff] [blame] | 1291 | newinet->rcv_tos = ip_hdr(skb)->tos; |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1292 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1293 | if (inet_opt) |
| 1294 | inet_csk(newsk)->icsk_ext_hdr_len = inet_opt->opt.optlen; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1295 | newinet->inet_id = newtp->write_seq ^ jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | |
Eric Dumazet | dfd25ff | 2012-03-10 09:20:21 +0000 | [diff] [blame] | 1297 | if (!dst) { |
| 1298 | dst = inet_csk_route_child_sock(sk, newsk, req); |
| 1299 | if (!dst) |
| 1300 | goto put_and_exit; |
| 1301 | } else { |
| 1302 | /* syncookie case : see end of cookie_v4_check() */ |
| 1303 | } |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1304 | sk_setup_caps(newsk, dst); |
| 1305 | |
Daniel Borkmann | 8116441 | 2015-01-05 23:57:48 +0100 | [diff] [blame] | 1306 | tcp_ca_openreq_child(newsk, dst); |
| 1307 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | tcp_sync_mss(newsk, dst_mtu(dst)); |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 1309 | newtp->advmss = dst_metric_advmss(dst); |
Tom Quetchenbach | f5fff5d | 2008-09-21 00:21:51 -0700 | [diff] [blame] | 1310 | if (tcp_sk(sk)->rx_opt.user_mss && |
| 1311 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) |
| 1312 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; |
| 1313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | tcp_initialize_rcv_mss(newsk); |
| 1315 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1316 | #ifdef CONFIG_TCP_MD5SIG |
| 1317 | /* Copy over the MD5 key from the original socket */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1318 | key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&newinet->inet_daddr, |
| 1319 | AF_INET); |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 1320 | if (key) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1321 | /* |
| 1322 | * We're using one, so create a matching key |
| 1323 | * on the newsk structure. If we fail to get |
| 1324 | * memory, then we end up not copying the key |
| 1325 | * across. Shucks. |
| 1326 | */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1327 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newinet->inet_daddr, |
| 1328 | AF_INET, key->key, key->keylen, GFP_ATOMIC); |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 1329 | sk_nocaps_add(newsk, NETIF_F_GSO_MASK); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1330 | } |
| 1331 | #endif |
| 1332 | |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1333 | if (__inet_inherit_port(sk, newsk) < 0) |
| 1334 | goto put_and_exit; |
Eric Dumazet | 5e0724d | 2015-10-22 08:20:46 -0700 | [diff] [blame] | 1335 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); |
Eric Dumazet | 805c4bc | 2015-11-05 11:07:13 -0800 | [diff] [blame] | 1336 | if (*own_req) |
Eric Dumazet | 49a496c | 2015-11-05 12:50:19 -0800 | [diff] [blame] | 1337 | tcp_move_syn(newtp, req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | |
| 1339 | return newsk; |
| 1340 | |
| 1341 | exit_overflow: |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 1342 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1343 | exit_nonewsk: |
| 1344 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | exit: |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 1346 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | return NULL; |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1348 | put_and_exit: |
Christoph Paasch | e337e24 | 2012-12-14 04:07:58 +0000 | [diff] [blame] | 1349 | inet_csk_prepare_forced_close(newsk); |
| 1350 | tcp_done(newsk); |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1351 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1353 | EXPORT_SYMBOL(tcp_v4_syn_recv_sock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1355 | 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] | 1356 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | #ifdef CONFIG_SYN_COOKIES |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1358 | const struct tcphdr *th = tcp_hdr(skb); |
| 1359 | |
Florian Westphal | af9b473 | 2010-06-03 00:43:44 +0000 | [diff] [blame] | 1360 | if (!th->syn) |
Cong Wang | 461b74c | 2014-10-15 14:33:22 -0700 | [diff] [blame] | 1361 | sk = cookie_v4_check(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | #endif |
| 1363 | return sk; |
| 1364 | } |
| 1365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | /* The socket must have it's spinlock held when we get |
Eric Dumazet | e994b2f | 2015-10-02 11:43:39 -0700 | [diff] [blame] | 1367 | * here, unless it is a TCP_LISTEN socket. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | * |
| 1369 | * We have a potential double-lock case here, so even when |
| 1370 | * doing backlog processing we use the BH locking scheme. |
| 1371 | * This is because we cannot sleep with the original spinlock |
| 1372 | * held. |
| 1373 | */ |
| 1374 | int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) |
| 1375 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1376 | struct sock *rsk; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1377 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
Eric Dumazet | 404e0a8 | 2012-07-29 23:20:37 +0000 | [diff] [blame] | 1379 | struct dst_entry *dst = sk->sk_rx_dst; |
| 1380 | |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1381 | sock_rps_save_rxhash(sk, skb); |
Eric Dumazet | 3d97379 | 2014-11-11 05:54:27 -0800 | [diff] [blame] | 1382 | sk_mark_napi_id(sk, skb); |
Eric Dumazet | 404e0a8 | 2012-07-29 23:20:37 +0000 | [diff] [blame] | 1383 | if (dst) { |
Eric Dumazet | 505fbcf | 2012-07-27 06:23:40 +0000 | [diff] [blame] | 1384 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1385 | !dst->ops->check(dst, 0)) { |
David S. Miller | 92101b3 | 2012-07-23 16:29:00 -0700 | [diff] [blame] | 1386 | dst_release(dst); |
| 1387 | sk->sk_rx_dst = NULL; |
| 1388 | } |
| 1389 | } |
Vijay Subramanian | c995ae2 | 2013-09-03 12:23:22 -0700 | [diff] [blame] | 1390 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | return 0; |
| 1392 | } |
| 1393 | |
Eric Dumazet | 12e25e1 | 2015-06-03 23:49:21 -0700 | [diff] [blame] | 1394 | if (tcp_checksum_complete(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | goto csum_err; |
| 1396 | |
| 1397 | if (sk->sk_state == TCP_LISTEN) { |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1398 | struct sock *nsk = tcp_v4_cookie_check(sk, skb); |
| 1399 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | if (!nsk) |
| 1401 | goto discard; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | if (nsk != sk) { |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1403 | sock_rps_save_rxhash(nsk, skb); |
Eric Dumazet | 38cb524 | 2015-10-02 11:43:26 -0700 | [diff] [blame] | 1404 | sk_mark_napi_id(nsk, skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1405 | if (tcp_child_process(sk, nsk, skb)) { |
| 1406 | rsk = nsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | goto reset; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1408 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | return 0; |
| 1410 | } |
Eric Dumazet | ca55158 | 2010-06-03 09:03:58 +0000 | [diff] [blame] | 1411 | } else |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1412 | sock_rps_save_rxhash(sk, skb); |
Eric Dumazet | ca55158 | 2010-06-03 09:03:58 +0000 | [diff] [blame] | 1413 | |
Eric Dumazet | 72ab4a8 | 2015-09-29 07:42:41 -0700 | [diff] [blame] | 1414 | if (tcp_rcv_state_process(sk, skb)) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1415 | rsk = sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | goto reset; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1417 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | return 0; |
| 1419 | |
| 1420 | reset: |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1421 | tcp_v4_send_reset(rsk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | discard: |
| 1423 | kfree_skb(skb); |
| 1424 | /* Be careful here. If this function gets more complicated and |
| 1425 | * gcc suffers from register pressure on the x86, sk (in %ebx) |
| 1426 | * might be destroyed here. This current version compiles correctly, |
| 1427 | * but you have been warned. |
| 1428 | */ |
| 1429 | return 0; |
| 1430 | |
| 1431 | csum_err: |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1432 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1433 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | goto discard; |
| 1435 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1436 | EXPORT_SYMBOL(tcp_v4_do_rcv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | |
David S. Miller | 160eb5a | 2012-06-27 22:01:22 -0700 | [diff] [blame] | 1438 | void tcp_v4_early_demux(struct sk_buff *skb) |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1439 | { |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1440 | const struct iphdr *iph; |
| 1441 | const struct tcphdr *th; |
| 1442 | struct sock *sk; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1443 | |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1444 | if (skb->pkt_type != PACKET_HOST) |
David S. Miller | 160eb5a | 2012-06-27 22:01:22 -0700 | [diff] [blame] | 1445 | return; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1446 | |
Eric Dumazet | 45f00f9 | 2012-10-22 21:42:47 +0000 | [diff] [blame] | 1447 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) |
David S. Miller | 160eb5a | 2012-06-27 22:01:22 -0700 | [diff] [blame] | 1448 | return; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1449 | |
| 1450 | iph = ip_hdr(skb); |
Eric Dumazet | 45f00f9 | 2012-10-22 21:42:47 +0000 | [diff] [blame] | 1451 | th = tcp_hdr(skb); |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1452 | |
| 1453 | if (th->doff < sizeof(struct tcphdr) / 4) |
David S. Miller | 160eb5a | 2012-06-27 22:01:22 -0700 | [diff] [blame] | 1454 | return; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1455 | |
Eric Dumazet | 45f00f9 | 2012-10-22 21:42:47 +0000 | [diff] [blame] | 1456 | sk = __inet_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1457 | iph->saddr, th->source, |
Vijay Subramanian | 7011d08 | 2012-06-23 17:38:10 +0000 | [diff] [blame] | 1458 | iph->daddr, ntohs(th->dest), |
Eric Dumazet | 9cb429d | 2012-07-24 01:19:31 +0000 | [diff] [blame] | 1459 | skb->skb_iif); |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1460 | if (sk) { |
| 1461 | skb->sk = sk; |
| 1462 | skb->destructor = sock_edemux; |
Eric Dumazet | f7e4eb0 | 2015-03-15 21:12:13 -0700 | [diff] [blame] | 1463 | if (sk_fullsock(sk)) { |
Michal Kubeček | d0c294c | 2015-03-23 15:14:00 +0100 | [diff] [blame] | 1464 | struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst); |
Eric Dumazet | 505fbcf | 2012-07-27 06:23:40 +0000 | [diff] [blame] | 1465 | |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1466 | if (dst) |
| 1467 | dst = dst_check(dst, 0); |
David S. Miller | 92101b3 | 2012-07-23 16:29:00 -0700 | [diff] [blame] | 1468 | if (dst && |
Eric Dumazet | 505fbcf | 2012-07-27 06:23:40 +0000 | [diff] [blame] | 1469 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
David S. Miller | 92101b3 | 2012-07-23 16:29:00 -0700 | [diff] [blame] | 1470 | skb_dst_set_noref(skb, dst); |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1471 | } |
| 1472 | } |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1473 | } |
| 1474 | |
Eric Dumazet | b2fb4f5 | 2013-03-06 12:58:01 +0000 | [diff] [blame] | 1475 | /* Packet is added to VJ-style prequeue for processing in process |
| 1476 | * context, if a reader task is waiting. Apparently, this exciting |
| 1477 | * idea (VJ's mail "Re: query about TCP header on tcp-ip" of 07 Sep 93) |
| 1478 | * failed somewhere. Latency? Burstiness? Well, at least now we will |
| 1479 | * see, why it failed. 8)8) --ANK |
| 1480 | * |
| 1481 | */ |
| 1482 | bool tcp_prequeue(struct sock *sk, struct sk_buff *skb) |
| 1483 | { |
| 1484 | struct tcp_sock *tp = tcp_sk(sk); |
| 1485 | |
| 1486 | if (sysctl_tcp_low_latency || !tp->ucopy.task) |
| 1487 | return false; |
| 1488 | |
| 1489 | if (skb->len <= tcp_hdrlen(skb) && |
| 1490 | skb_queue_len(&tp->ucopy.prequeue) == 0) |
| 1491 | return false; |
| 1492 | |
Eric Dumazet | ca777ef | 2014-09-08 08:06:07 -0700 | [diff] [blame] | 1493 | /* Before escaping RCU protected region, we need to take care of skb |
| 1494 | * dst. Prequeue is only enabled for established sockets. |
| 1495 | * For such sockets, we might need the skb dst only to set sk->sk_rx_dst |
| 1496 | * Instead of doing full sk_rx_dst validity here, let's perform |
| 1497 | * an optimistic check. |
| 1498 | */ |
| 1499 | if (likely(sk->sk_rx_dst)) |
| 1500 | skb_dst_drop(skb); |
| 1501 | else |
Eric Dumazet | 5037e9e | 2015-12-14 14:08:53 -0800 | [diff] [blame] | 1502 | skb_dst_force_safe(skb); |
Eric Dumazet | ca777ef | 2014-09-08 08:06:07 -0700 | [diff] [blame] | 1503 | |
Eric Dumazet | b2fb4f5 | 2013-03-06 12:58:01 +0000 | [diff] [blame] | 1504 | __skb_queue_tail(&tp->ucopy.prequeue, skb); |
| 1505 | tp->ucopy.memory += skb->truesize; |
| 1506 | if (tp->ucopy.memory > sk->sk_rcvbuf) { |
| 1507 | struct sk_buff *skb1; |
| 1508 | |
| 1509 | BUG_ON(sock_owned_by_user(sk)); |
| 1510 | |
| 1511 | while ((skb1 = __skb_dequeue(&tp->ucopy.prequeue)) != NULL) { |
| 1512 | sk_backlog_rcv(sk, skb1); |
| 1513 | NET_INC_STATS_BH(sock_net(sk), |
| 1514 | LINUX_MIB_TCPPREQUEUEDROPPED); |
| 1515 | } |
| 1516 | |
| 1517 | tp->ucopy.memory = 0; |
| 1518 | } else if (skb_queue_len(&tp->ucopy.prequeue) == 1) { |
| 1519 | wake_up_interruptible_sync_poll(sk_sleep(sk), |
| 1520 | POLLIN | POLLRDNORM | POLLRDBAND); |
| 1521 | if (!inet_csk_ack_scheduled(sk)) |
| 1522 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, |
| 1523 | (3 * tcp_rto_min(sk)) / 4, |
| 1524 | TCP_RTO_MAX); |
| 1525 | } |
| 1526 | return true; |
| 1527 | } |
| 1528 | EXPORT_SYMBOL(tcp_prequeue); |
| 1529 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | /* |
| 1531 | * From tcp_input.c |
| 1532 | */ |
| 1533 | |
| 1534 | int tcp_v4_rcv(struct sk_buff *skb) |
| 1535 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1536 | const struct iphdr *iph; |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1537 | const struct tcphdr *th; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | struct sock *sk; |
| 1539 | int ret; |
Pavel Emelyanov | a86b1e3 | 2008-07-16 20:20:58 -0700 | [diff] [blame] | 1540 | struct net *net = dev_net(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | |
| 1542 | if (skb->pkt_type != PACKET_HOST) |
| 1543 | goto discard_it; |
| 1544 | |
| 1545 | /* Count it even if it's bad */ |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1546 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | |
| 1548 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) |
| 1549 | goto discard_it; |
| 1550 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1551 | th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | |
| 1553 | if (th->doff < sizeof(struct tcphdr) / 4) |
| 1554 | goto bad_packet; |
| 1555 | if (!pskb_may_pull(skb, th->doff * 4)) |
| 1556 | goto discard_it; |
| 1557 | |
| 1558 | /* An explanation is required here, I think. |
| 1559 | * Packet length and doff are validated by header prediction, |
Stephen Hemminger | caa20d9a | 2005-11-10 17:13:47 -0800 | [diff] [blame] | 1560 | * provided case of th->doff==0 is eliminated. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | * So, we defer the checks. */ |
Tom Herbert | ed70fcf | 2014-05-02 16:29:38 -0700 | [diff] [blame] | 1562 | |
| 1563 | if (skb_checksum_init(skb, IPPROTO_TCP, inet_compute_pseudo)) |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1564 | goto csum_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1566 | th = tcp_hdr(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1567 | iph = ip_hdr(skb); |
Eric Dumazet | 971f10e | 2014-09-27 09:50:57 -0700 | [diff] [blame] | 1568 | /* This is tricky : We move IPCB at its correct location into TCP_SKB_CB() |
| 1569 | * barrier() makes sure compiler wont play fool^Waliasing games. |
| 1570 | */ |
| 1571 | memmove(&TCP_SKB_CB(skb)->header.h4, IPCB(skb), |
| 1572 | sizeof(struct inet_skb_parm)); |
| 1573 | barrier(); |
| 1574 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
| 1576 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + |
| 1577 | skb->len - th->doff * 4); |
| 1578 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); |
Eric Dumazet | e11ecdd | 2014-09-15 04:19:51 -0700 | [diff] [blame] | 1579 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); |
Eric Dumazet | 04317da | 2014-09-05 15:33:32 -0700 | [diff] [blame] | 1580 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; |
Eric Dumazet | b82d1bb | 2011-09-27 02:20:08 -0400 | [diff] [blame] | 1581 | TCP_SKB_CB(skb)->ip_dsfield = ipv4_get_dsfield(iph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | TCP_SKB_CB(skb)->sacked = 0; |
| 1583 | |
Eric Dumazet | 4bdc3d6 | 2015-10-13 17:12:54 -0700 | [diff] [blame] | 1584 | lookup: |
Arnaldo Carvalho de Melo | 9a1f27c | 2008-10-07 11:41:57 -0700 | [diff] [blame] | 1585 | sk = __inet_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1586 | if (!sk) |
| 1587 | goto no_tcp_socket; |
| 1588 | |
Eric Dumazet | bb134d5 | 2010-03-09 05:55:56 +0000 | [diff] [blame] | 1589 | process: |
| 1590 | if (sk->sk_state == TCP_TIME_WAIT) |
| 1591 | goto do_time_wait; |
| 1592 | |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1593 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
| 1594 | struct request_sock *req = inet_reqsk(sk); |
| 1595 | struct sock *nsk = NULL; |
| 1596 | |
| 1597 | sk = req->rsk_listener; |
| 1598 | if (tcp_v4_inbound_md5_hash(sk, skb)) |
| 1599 | goto discard_and_relse; |
Eric Dumazet | 4bdc3d6 | 2015-10-13 17:12:54 -0700 | [diff] [blame] | 1600 | if (likely(sk->sk_state == TCP_LISTEN)) { |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1601 | nsk = tcp_check_req(sk, skb, req, false); |
Eric Dumazet | 4bdc3d6 | 2015-10-13 17:12:54 -0700 | [diff] [blame] | 1602 | } else { |
Eric Dumazet | f03f2e1 | 2015-10-14 11:16:27 -0700 | [diff] [blame] | 1603 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
Eric Dumazet | 4bdc3d6 | 2015-10-13 17:12:54 -0700 | [diff] [blame] | 1604 | goto lookup; |
| 1605 | } |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1606 | if (!nsk) { |
| 1607 | reqsk_put(req); |
| 1608 | goto discard_it; |
| 1609 | } |
| 1610 | if (nsk == sk) { |
| 1611 | sock_hold(sk); |
| 1612 | reqsk_put(req); |
| 1613 | } else if (tcp_child_process(sk, nsk, skb)) { |
| 1614 | tcp_v4_send_reset(nsk, skb); |
| 1615 | goto discard_it; |
| 1616 | } else { |
| 1617 | return 0; |
| 1618 | } |
| 1619 | } |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 1620 | if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { |
| 1621 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); |
Stephen Hemminger | d218d11 | 2010-01-11 16:28:01 -0800 | [diff] [blame] | 1622 | goto discard_and_relse; |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 1623 | } |
Stephen Hemminger | d218d11 | 2010-01-11 16:28:01 -0800 | [diff] [blame] | 1624 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1625 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 1626 | goto discard_and_relse; |
Dmitry Popov | 9ea88a1 | 2014-08-07 02:38:22 +0400 | [diff] [blame] | 1627 | |
Dmitry Popov | 9ea88a1 | 2014-08-07 02:38:22 +0400 | [diff] [blame] | 1628 | if (tcp_v4_inbound_md5_hash(sk, skb)) |
| 1629 | goto discard_and_relse; |
Dmitry Popov | 9ea88a1 | 2014-08-07 02:38:22 +0400 | [diff] [blame] | 1630 | |
Patrick McHardy | b59c270 | 2006-01-06 23:06:10 -0800 | [diff] [blame] | 1631 | nf_reset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 1633 | if (sk_filter(sk, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | goto discard_and_relse; |
| 1635 | |
| 1636 | skb->dev = NULL; |
| 1637 | |
Eric Dumazet | e994b2f | 2015-10-02 11:43:39 -0700 | [diff] [blame] | 1638 | if (sk->sk_state == TCP_LISTEN) { |
| 1639 | ret = tcp_v4_do_rcv(sk, skb); |
| 1640 | goto put_and_return; |
| 1641 | } |
| 1642 | |
| 1643 | sk_incoming_cpu_update(sk); |
| 1644 | |
Ingo Molnar | c636618 | 2006-07-03 00:25:13 -0700 | [diff] [blame] | 1645 | bh_lock_sock_nested(sk); |
Marcelo Ricardo Leitner | 2efd055 | 2015-05-20 16:35:41 -0700 | [diff] [blame] | 1646 | tcp_sk(sk)->segs_in += max_t(u16, 1, skb_shinfo(skb)->gso_segs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | ret = 0; |
| 1648 | if (!sock_owned_by_user(sk)) { |
Dan Williams | 7bced39 | 2013-12-30 12:37:29 -0800 | [diff] [blame] | 1649 | if (!tcp_prequeue(sk, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | ret = tcp_v4_do_rcv(sk, skb); |
Eric Dumazet | da882c1 | 2012-04-22 23:38:54 +0000 | [diff] [blame] | 1651 | } else if (unlikely(sk_add_backlog(sk, skb, |
| 1652 | sk->sk_rcvbuf + sk->sk_sndbuf))) { |
Zhu Yi | 6b03a53 | 2010-03-04 18:01:41 +0000 | [diff] [blame] | 1653 | bh_unlock_sock(sk); |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 1654 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
Zhu Yi | 6b03a53 | 2010-03-04 18:01:41 +0000 | [diff] [blame] | 1655 | goto discard_and_relse; |
| 1656 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | bh_unlock_sock(sk); |
| 1658 | |
Eric Dumazet | e994b2f | 2015-10-02 11:43:39 -0700 | [diff] [blame] | 1659 | put_and_return: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1660 | sock_put(sk); |
| 1661 | |
| 1662 | return ret; |
| 1663 | |
| 1664 | no_tcp_socket: |
| 1665 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 1666 | goto discard_it; |
| 1667 | |
Eric Dumazet | 12e25e1 | 2015-06-03 23:49:21 -0700 | [diff] [blame] | 1668 | if (tcp_checksum_complete(skb)) { |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1669 | csum_error: |
| 1670 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | bad_packet: |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1672 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1673 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1674 | tcp_v4_send_reset(NULL, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | } |
| 1676 | |
| 1677 | discard_it: |
| 1678 | /* Discard frame. */ |
| 1679 | kfree_skb(skb); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1680 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | |
| 1682 | discard_and_relse: |
| 1683 | sock_put(sk); |
| 1684 | goto discard_it; |
| 1685 | |
| 1686 | do_time_wait: |
| 1687 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1688 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | goto discard_it; |
| 1690 | } |
| 1691 | |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1692 | if (tcp_checksum_complete(skb)) { |
| 1693 | inet_twsk_put(inet_twsk(sk)); |
| 1694 | goto csum_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | } |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1696 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | case TCP_TW_SYN: { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1698 | struct sock *sk2 = inet_lookup_listener(dev_net(skb->dev), |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 1699 | &tcp_hashinfo, |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 1700 | iph->saddr, th->source, |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1701 | iph->daddr, th->dest, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1702 | inet_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | if (sk2) { |
Eric Dumazet | dbe7faa | 2015-07-08 14:28:30 -0700 | [diff] [blame] | 1704 | inet_twsk_deschedule_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | sk = sk2; |
| 1706 | goto process; |
| 1707 | } |
| 1708 | /* Fall through to ACK */ |
| 1709 | } |
| 1710 | case TCP_TW_ACK: |
| 1711 | tcp_v4_timewait_ack(sk, skb); |
| 1712 | break; |
| 1713 | case TCP_TW_RST: |
Florian Westphal | 271c3b9 | 2015-12-21 21:29:26 +0100 | [diff] [blame] | 1714 | tcp_v4_send_reset(sk, skb); |
| 1715 | inet_twsk_deschedule_put(inet_twsk(sk)); |
| 1716 | goto discard_it; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1717 | case TCP_TW_SUCCESS:; |
| 1718 | } |
| 1719 | goto discard_it; |
| 1720 | } |
| 1721 | |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1722 | static struct timewait_sock_ops tcp_timewait_sock_ops = { |
| 1723 | .twsk_obj_size = sizeof(struct tcp_timewait_sock), |
| 1724 | .twsk_unique = tcp_twsk_unique, |
| 1725 | .twsk_destructor= tcp_twsk_destructor, |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1726 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | |
Eric Dumazet | 63d02d1 | 2012-08-09 14:11:00 +0000 | [diff] [blame] | 1728 | 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] | 1729 | { |
| 1730 | struct dst_entry *dst = skb_dst(skb); |
| 1731 | |
Eric Dumazet | 5037e9e | 2015-12-14 14:08:53 -0800 | [diff] [blame] | 1732 | if (dst && dst_hold_safe(dst)) { |
Eric Dumazet | ca777ef | 2014-09-08 08:06:07 -0700 | [diff] [blame] | 1733 | sk->sk_rx_dst = dst; |
| 1734 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; |
| 1735 | } |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 1736 | } |
Eric Dumazet | 63d02d1 | 2012-08-09 14:11:00 +0000 | [diff] [blame] | 1737 | EXPORT_SYMBOL(inet_sk_rx_dst_set); |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 1738 | |
Stephen Hemminger | 3b401a8 | 2009-09-01 19:25:04 +0000 | [diff] [blame] | 1739 | const struct inet_connection_sock_af_ops ipv4_specific = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1740 | .queue_xmit = ip_queue_xmit, |
| 1741 | .send_check = tcp_v4_send_check, |
| 1742 | .rebuild_header = inet_sk_rebuild_header, |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 1743 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1744 | .conn_request = tcp_v4_conn_request, |
| 1745 | .syn_recv_sock = tcp_v4_syn_recv_sock, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1746 | .net_header_len = sizeof(struct iphdr), |
| 1747 | .setsockopt = ip_setsockopt, |
| 1748 | .getsockopt = ip_getsockopt, |
| 1749 | .addr2sockaddr = inet_csk_addr2sockaddr, |
| 1750 | .sockaddr_len = sizeof(struct sockaddr_in), |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1751 | .bind_conflict = inet_csk_bind_conflict, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1752 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1753 | .compat_setsockopt = compat_ip_setsockopt, |
| 1754 | .compat_getsockopt = compat_ip_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1755 | #endif |
Neal Cardwell | 4fab907 | 2014-08-14 12:40:05 -0400 | [diff] [blame] | 1756 | .mtu_reduced = tcp_v4_mtu_reduced, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | }; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1758 | EXPORT_SYMBOL(ipv4_specific); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1760 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 1761 | static const struct tcp_sock_af_ops tcp_sock_ipv4_specific = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1762 | .md5_lookup = tcp_v4_md5_lookup, |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1763 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1764 | .md5_parse = tcp_v4_parse_md5_keys, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1765 | }; |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 1766 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1767 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | /* NOTE: A lot of things set to zero explicitly by call to |
| 1769 | * sk_alloc() so need not be done here. |
| 1770 | */ |
| 1771 | static int tcp_v4_init_sock(struct sock *sk) |
| 1772 | { |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1773 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1774 | |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 1775 | tcp_init_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1776 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1777 | icsk->icsk_af_ops = &ipv4_specific; |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 1778 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1779 | #ifdef CONFIG_TCP_MD5SIG |
David S. Miller | ac807fa | 2012-04-23 03:21:58 -0400 | [diff] [blame] | 1780 | tcp_sk(sk)->af_specific = &tcp_sock_ipv4_specific; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1781 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1783 | return 0; |
| 1784 | } |
| 1785 | |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 1786 | void tcp_v4_destroy_sock(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1787 | { |
| 1788 | struct tcp_sock *tp = tcp_sk(sk); |
| 1789 | |
| 1790 | tcp_clear_xmit_timers(sk); |
| 1791 | |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1792 | tcp_cleanup_congestion_control(sk); |
Stephen Hemminger | 317a76f | 2005-06-23 12:19:55 -0700 | [diff] [blame] | 1793 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1794 | /* Cleanup up the write buffer. */ |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 1795 | tcp_write_queue_purge(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1796 | |
| 1797 | /* Cleans up our, hopefully empty, out_of_order_queue. */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1798 | __skb_queue_purge(&tp->out_of_order_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1799 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1800 | #ifdef CONFIG_TCP_MD5SIG |
| 1801 | /* Clean up the MD5 key list, if any */ |
| 1802 | if (tp->md5sig_info) { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1803 | tcp_clear_md5_list(sk); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1804 | kfree_rcu(tp->md5sig_info, rcu); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1805 | tp->md5sig_info = NULL; |
| 1806 | } |
| 1807 | #endif |
| 1808 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | /* Clean prequeue, it must be empty really */ |
| 1810 | __skb_queue_purge(&tp->ucopy.prequeue); |
| 1811 | |
| 1812 | /* Clean up a referenced TCP bind bucket. */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1813 | if (inet_csk(sk)->icsk_bind_hash) |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1814 | inet_put_port(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1815 | |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 1816 | BUG_ON(tp->fastopen_rsk); |
William Allen Simpson | 435cf55 | 2009-12-02 18:17:05 +0000 | [diff] [blame] | 1817 | |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1818 | /* If socket is aborted during connect operation */ |
| 1819 | tcp_free_fastopen_req(tp); |
Eric Dumazet | cd8ae85 | 2015-05-03 21:34:46 -0700 | [diff] [blame] | 1820 | tcp_saved_syn_free(tp); |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1821 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1822 | sk_sockets_allocated_dec(sk); |
Johannes Weiner | 3d596f7 | 2016-01-14 15:21:05 -0800 | [diff] [blame] | 1823 | |
Johannes Weiner | baac50b | 2016-01-14 15:21:17 -0800 | [diff] [blame] | 1824 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
Johannes Weiner | 3d596f7 | 2016-01-14 15:21:05 -0800 | [diff] [blame] | 1825 | sock_release_memcg(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | EXPORT_SYMBOL(tcp_v4_destroy_sock); |
| 1828 | |
| 1829 | #ifdef CONFIG_PROC_FS |
| 1830 | /* Proc filesystem TCP sock list dumping. */ |
| 1831 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1832 | /* |
| 1833 | * Get next listener socket follow cur. If cur is NULL, get first socket |
| 1834 | * starting from bucket given in st->bucket; when st->bucket is zero the |
| 1835 | * very first socket in the hash table is returned. |
| 1836 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1837 | static void *listening_get_next(struct seq_file *seq, void *cur) |
| 1838 | { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1839 | struct inet_connection_sock *icsk; |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 1840 | struct hlist_nulls_node *node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | struct sock *sk = cur; |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 1842 | struct inet_listen_hashbucket *ilb; |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 1843 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 1844 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1845 | |
| 1846 | if (!sk) { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1847 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 1848 | spin_lock_bh(&ilb->lock); |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 1849 | sk = sk_nulls_head(&ilb->head); |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1850 | st->offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | goto get_sk; |
| 1852 | } |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 1853 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1854 | ++st->num; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1855 | ++st->offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1856 | |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1857 | sk = sk_nulls_next(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1858 | get_sk: |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 1859 | sk_nulls_for_each_from(sk, node) { |
Pavel Emelyanov | 8475ef9 | 2010-11-22 03:26:12 +0000 | [diff] [blame] | 1860 | if (!net_eq(sock_net(sk), net)) |
| 1861 | continue; |
| 1862 | if (sk->sk_family == st->family) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1863 | cur = sk; |
| 1864 | goto out; |
| 1865 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1866 | icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1867 | } |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 1868 | spin_unlock_bh(&ilb->lock); |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1869 | st->offset = 0; |
Arnaldo Carvalho de Melo | 0f7ff92 | 2005-08-09 19:59:44 -0700 | [diff] [blame] | 1870 | if (++st->bucket < INET_LHTABLE_SIZE) { |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 1871 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
| 1872 | spin_lock_bh(&ilb->lock); |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 1873 | sk = sk_nulls_head(&ilb->head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | goto get_sk; |
| 1875 | } |
| 1876 | cur = NULL; |
| 1877 | out: |
| 1878 | return cur; |
| 1879 | } |
| 1880 | |
| 1881 | static void *listening_get_idx(struct seq_file *seq, loff_t *pos) |
| 1882 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1883 | struct tcp_iter_state *st = seq->private; |
| 1884 | void *rc; |
| 1885 | |
| 1886 | st->bucket = 0; |
| 1887 | st->offset = 0; |
| 1888 | rc = listening_get_next(seq, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1889 | |
| 1890 | while (rc && *pos) { |
| 1891 | rc = listening_get_next(seq, rc); |
| 1892 | --*pos; |
| 1893 | } |
| 1894 | return rc; |
| 1895 | } |
| 1896 | |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 1897 | static inline bool empty_bucket(const struct tcp_iter_state *st) |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 1898 | { |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 1899 | return hlist_nulls_empty(&tcp_hashinfo.ehash[st->bucket].chain); |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 1900 | } |
| 1901 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1902 | /* |
| 1903 | * Get first established socket starting from bucket given in st->bucket. |
| 1904 | * If st->bucket is zero, the very first socket in the hash is returned. |
| 1905 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1906 | static void *established_get_first(struct seq_file *seq) |
| 1907 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 1908 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 1909 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1910 | void *rc = NULL; |
| 1911 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1912 | st->offset = 0; |
| 1913 | for (; st->bucket <= tcp_hashinfo.ehash_mask; ++st->bucket) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | struct sock *sk; |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 1915 | struct hlist_nulls_node *node; |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 1916 | spinlock_t *lock = inet_ehash_lockp(&tcp_hashinfo, st->bucket); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1917 | |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 1918 | /* Lockless fast path for the common case of empty buckets */ |
| 1919 | if (empty_bucket(st)) |
| 1920 | continue; |
| 1921 | |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 1922 | spin_lock_bh(lock); |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 1923 | sk_nulls_for_each(sk, node, &tcp_hashinfo.ehash[st->bucket].chain) { |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 1924 | if (sk->sk_family != st->family || |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 1925 | !net_eq(sock_net(sk), net)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1926 | continue; |
| 1927 | } |
| 1928 | rc = sk; |
| 1929 | goto out; |
| 1930 | } |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 1931 | spin_unlock_bh(lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1932 | } |
| 1933 | out: |
| 1934 | return rc; |
| 1935 | } |
| 1936 | |
| 1937 | static void *established_get_next(struct seq_file *seq, void *cur) |
| 1938 | { |
| 1939 | struct sock *sk = cur; |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 1940 | struct hlist_nulls_node *node; |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 1941 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 1942 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1943 | |
| 1944 | ++st->num; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1945 | ++st->offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1946 | |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 1947 | sk = sk_nulls_next(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1948 | |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 1949 | sk_nulls_for_each_from(sk, node) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 1950 | if (sk->sk_family == st->family && net_eq(sock_net(sk), net)) |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 1951 | return sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1952 | } |
| 1953 | |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 1954 | spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
| 1955 | ++st->bucket; |
| 1956 | return established_get_first(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1957 | } |
| 1958 | |
| 1959 | static void *established_get_idx(struct seq_file *seq, loff_t pos) |
| 1960 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1961 | struct tcp_iter_state *st = seq->private; |
| 1962 | void *rc; |
| 1963 | |
| 1964 | st->bucket = 0; |
| 1965 | rc = established_get_first(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1966 | |
| 1967 | while (rc && pos) { |
| 1968 | rc = established_get_next(seq, rc); |
| 1969 | --pos; |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1970 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1971 | return rc; |
| 1972 | } |
| 1973 | |
| 1974 | static void *tcp_get_idx(struct seq_file *seq, loff_t pos) |
| 1975 | { |
| 1976 | void *rc; |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 1977 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1978 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1979 | st->state = TCP_SEQ_STATE_LISTENING; |
| 1980 | rc = listening_get_idx(seq, &pos); |
| 1981 | |
| 1982 | if (!rc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1983 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
| 1984 | rc = established_get_idx(seq, pos); |
| 1985 | } |
| 1986 | |
| 1987 | return rc; |
| 1988 | } |
| 1989 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1990 | static void *tcp_seek_last_pos(struct seq_file *seq) |
| 1991 | { |
| 1992 | struct tcp_iter_state *st = seq->private; |
| 1993 | int offset = st->offset; |
| 1994 | int orig_num = st->num; |
| 1995 | void *rc = NULL; |
| 1996 | |
| 1997 | switch (st->state) { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1998 | case TCP_SEQ_STATE_LISTENING: |
| 1999 | if (st->bucket >= INET_LHTABLE_SIZE) |
| 2000 | break; |
| 2001 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2002 | rc = listening_get_next(seq, NULL); |
| 2003 | while (offset-- && rc) |
| 2004 | rc = listening_get_next(seq, rc); |
| 2005 | if (rc) |
| 2006 | break; |
| 2007 | st->bucket = 0; |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2008 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2009 | /* Fallthrough */ |
| 2010 | case TCP_SEQ_STATE_ESTABLISHED: |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2011 | if (st->bucket > tcp_hashinfo.ehash_mask) |
| 2012 | break; |
| 2013 | rc = established_get_first(seq); |
| 2014 | while (offset-- && rc) |
| 2015 | rc = established_get_next(seq, rc); |
| 2016 | } |
| 2017 | |
| 2018 | st->num = orig_num; |
| 2019 | |
| 2020 | return rc; |
| 2021 | } |
| 2022 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2023 | static void *tcp_seq_start(struct seq_file *seq, loff_t *pos) |
| 2024 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2025 | struct tcp_iter_state *st = seq->private; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2026 | void *rc; |
| 2027 | |
| 2028 | if (*pos && *pos == st->last_pos) { |
| 2029 | rc = tcp_seek_last_pos(seq); |
| 2030 | if (rc) |
| 2031 | goto out; |
| 2032 | } |
| 2033 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2034 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2035 | st->num = 0; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2036 | st->bucket = 0; |
| 2037 | st->offset = 0; |
| 2038 | rc = *pos ? tcp_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| 2039 | |
| 2040 | out: |
| 2041 | st->last_pos = *pos; |
| 2042 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2043 | } |
| 2044 | |
| 2045 | static void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2046 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2047 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2048 | void *rc = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2049 | |
| 2050 | if (v == SEQ_START_TOKEN) { |
| 2051 | rc = tcp_get_idx(seq, 0); |
| 2052 | goto out; |
| 2053 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2054 | |
| 2055 | switch (st->state) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2056 | case TCP_SEQ_STATE_LISTENING: |
| 2057 | rc = listening_get_next(seq, v); |
| 2058 | if (!rc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2059 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2060 | st->bucket = 0; |
| 2061 | st->offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2062 | rc = established_get_first(seq); |
| 2063 | } |
| 2064 | break; |
| 2065 | case TCP_SEQ_STATE_ESTABLISHED: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | rc = established_get_next(seq, v); |
| 2067 | break; |
| 2068 | } |
| 2069 | out: |
| 2070 | ++*pos; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2071 | st->last_pos = *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2072 | return rc; |
| 2073 | } |
| 2074 | |
| 2075 | static void tcp_seq_stop(struct seq_file *seq, void *v) |
| 2076 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2077 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2078 | |
| 2079 | switch (st->state) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2080 | case TCP_SEQ_STATE_LISTENING: |
| 2081 | if (v != SEQ_START_TOKEN) |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2082 | spin_unlock_bh(&tcp_hashinfo.listening_hash[st->bucket].lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2083 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | case TCP_SEQ_STATE_ESTABLISHED: |
| 2085 | if (v) |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2086 | spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2087 | break; |
| 2088 | } |
| 2089 | } |
| 2090 | |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2091 | int tcp_seq_open(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | { |
Al Viro | d9dda78 | 2013-03-31 18:16:14 -0400 | [diff] [blame] | 2093 | struct tcp_seq_afinfo *afinfo = PDE_DATA(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2094 | struct tcp_iter_state *s; |
Denis V. Lunev | 52d6f3f | 2008-04-13 22:12:41 -0700 | [diff] [blame] | 2095 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2096 | |
Denis V. Lunev | 52d6f3f | 2008-04-13 22:12:41 -0700 | [diff] [blame] | 2097 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
| 2098 | sizeof(struct tcp_iter_state)); |
| 2099 | if (err < 0) |
| 2100 | return err; |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 2101 | |
Denis V. Lunev | 52d6f3f | 2008-04-13 22:12:41 -0700 | [diff] [blame] | 2102 | s = ((struct seq_file *)file->private_data)->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2103 | s->family = afinfo->family; |
stephen hemminger | 688d194 | 2014-08-29 23:32:05 -0700 | [diff] [blame] | 2104 | s->last_pos = 0; |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 2105 | return 0; |
| 2106 | } |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2107 | EXPORT_SYMBOL(tcp_seq_open); |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 2108 | |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2109 | int tcp_proc_register(struct net *net, struct tcp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2110 | { |
| 2111 | int rc = 0; |
| 2112 | struct proc_dir_entry *p; |
| 2113 | |
Denis V. Lunev | 9427c4b | 2008-04-13 22:12:13 -0700 | [diff] [blame] | 2114 | afinfo->seq_ops.start = tcp_seq_start; |
| 2115 | afinfo->seq_ops.next = tcp_seq_next; |
| 2116 | afinfo->seq_ops.stop = tcp_seq_stop; |
| 2117 | |
Denis V. Lunev | 84841c3 | 2008-05-02 04:10:08 -0700 | [diff] [blame] | 2118 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2119 | afinfo->seq_fops, afinfo); |
Denis V. Lunev | 84841c3 | 2008-05-02 04:10:08 -0700 | [diff] [blame] | 2120 | if (!p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | rc = -ENOMEM; |
| 2122 | return rc; |
| 2123 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2124 | EXPORT_SYMBOL(tcp_proc_register); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2125 | |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2126 | void tcp_proc_unregister(struct net *net, struct tcp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2127 | { |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 2128 | remove_proc_entry(afinfo->name, net->proc_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2129 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2130 | EXPORT_SYMBOL(tcp_proc_unregister); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2131 | |
Eric Dumazet | d4f0687 | 2015-03-12 16:44:09 -0700 | [diff] [blame] | 2132 | static void get_openreq4(const struct request_sock *req, |
Eric Dumazet | aa3a0c8 | 2015-10-02 11:43:30 -0700 | [diff] [blame] | 2133 | struct seq_file *f, int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2134 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2135 | const struct inet_request_sock *ireq = inet_rsk(req); |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 2136 | long delta = req->rsk_timer.expires - jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2137 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2138 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2139 | " %02X %08X:%08X %02X:%08lX %08X %5u %8d %u %d %pK", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2140 | i, |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 2141 | ireq->ir_loc_addr, |
Eric Dumazet | d4f0687 | 2015-03-12 16:44:09 -0700 | [diff] [blame] | 2142 | ireq->ir_num, |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 2143 | ireq->ir_rmt_addr, |
| 2144 | ntohs(ireq->ir_rmt_port), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2145 | TCP_SYN_RECV, |
| 2146 | 0, 0, /* could print option size, but that is af dependent. */ |
| 2147 | 1, /* timers active (only the expire timer) */ |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2148 | jiffies_delta_to_clock_t(delta), |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 2149 | req->num_timeout, |
Eric Dumazet | aa3a0c8 | 2015-10-02 11:43:30 -0700 | [diff] [blame] | 2150 | from_kuid_munged(seq_user_ns(f), |
| 2151 | sock_i_uid(req->rsk_listener)), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2152 | 0, /* non standard timer */ |
| 2153 | 0, /* open_requests have no inode */ |
Eric Dumazet | d4f0687 | 2015-03-12 16:44:09 -0700 | [diff] [blame] | 2154 | 0, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2155 | req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | } |
| 2157 | |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2158 | 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] | 2159 | { |
| 2160 | int timer_active; |
| 2161 | unsigned long timer_expires; |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2162 | const struct tcp_sock *tp = tcp_sk(sk); |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2163 | const struct inet_connection_sock *icsk = inet_csk(sk); |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2164 | const struct inet_sock *inet = inet_sk(sk); |
Eric Dumazet | 0536fcc | 2015-09-29 07:42:52 -0700 | [diff] [blame] | 2165 | const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 2166 | __be32 dest = inet->inet_daddr; |
| 2167 | __be32 src = inet->inet_rcv_saddr; |
| 2168 | __u16 destp = ntohs(inet->inet_dport); |
| 2169 | __u16 srcp = ntohs(inet->inet_sport); |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2170 | int rx_queue; |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2171 | int state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2172 | |
Nandita Dukkipati | 6ba8a3b | 2013-03-11 10:00:43 +0000 | [diff] [blame] | 2173 | if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
| 2174 | icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS || |
| 2175 | icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2176 | timer_active = 1; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2177 | timer_expires = icsk->icsk_timeout; |
| 2178 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2179 | timer_active = 4; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2180 | timer_expires = icsk->icsk_timeout; |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2181 | } else if (timer_pending(&sk->sk_timer)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2182 | timer_active = 2; |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2183 | timer_expires = sk->sk_timer.expires; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2184 | } else { |
| 2185 | timer_active = 0; |
| 2186 | timer_expires = jiffies; |
| 2187 | } |
| 2188 | |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2189 | state = sk_state_load(sk); |
| 2190 | if (state == TCP_LISTEN) |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2191 | rx_queue = sk->sk_ack_backlog; |
| 2192 | else |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2193 | /* Because we don't lock the socket, |
| 2194 | * we might find a transient negative value. |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2195 | */ |
| 2196 | rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); |
| 2197 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2198 | 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] | 2199 | "%08X %5u %8d %lu %d %pK %lu %lu %u %u %d", |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2200 | i, src, srcp, dest, destp, state, |
Sridhar Samudrala | 47da8ee | 2006-06-27 13:29:00 -0700 | [diff] [blame] | 2201 | tp->write_seq - tp->snd_una, |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2202 | rx_queue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2203 | timer_active, |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2204 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2205 | icsk->icsk_retransmits, |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 2206 | 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] | 2207 | icsk->icsk_probes_out, |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2208 | sock_i_ino(sk), |
| 2209 | atomic_read(&sk->sk_refcnt), sk, |
Stephen Hemminger | 7be8735 | 2008-06-27 20:00:19 -0700 | [diff] [blame] | 2210 | jiffies_to_clock_t(icsk->icsk_rto), |
| 2211 | jiffies_to_clock_t(icsk->icsk_ack.ato), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2212 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2213 | tp->snd_cwnd, |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2214 | state == TCP_LISTEN ? |
| 2215 | fastopenq->max_qlen : |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2216 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2217 | } |
| 2218 | |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2219 | static void get_timewait4_sock(const struct inet_timewait_sock *tw, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2220 | struct seq_file *f, int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | { |
Eric Dumazet | 789f558 | 2015-04-12 18:51:09 -0700 | [diff] [blame] | 2222 | long delta = tw->tw_timer.expires - jiffies; |
Al Viro | 23f33c2 | 2006-09-27 18:43:50 -0700 | [diff] [blame] | 2223 | __be32 dest, src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2224 | __u16 destp, srcp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2225 | |
| 2226 | dest = tw->tw_daddr; |
| 2227 | src = tw->tw_rcv_saddr; |
| 2228 | destp = ntohs(tw->tw_dport); |
| 2229 | srcp = ntohs(tw->tw_sport); |
| 2230 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2231 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2232 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2233 | i, src, srcp, dest, destp, tw->tw_substate, 0, 0, |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2234 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2235 | atomic_read(&tw->tw_refcnt), tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2236 | } |
| 2237 | |
| 2238 | #define TMPSZ 150 |
| 2239 | |
| 2240 | static int tcp4_seq_show(struct seq_file *seq, void *v) |
| 2241 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2242 | struct tcp_iter_state *st; |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2243 | struct sock *sk = v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2244 | |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2245 | seq_setwidth(seq, TMPSZ - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2246 | if (v == SEQ_START_TOKEN) { |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2247 | seq_puts(seq, " sl local_address rem_address st tx_queue " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2248 | "rx_queue tr tm->when retrnsmt uid timeout " |
| 2249 | "inode"); |
| 2250 | goto out; |
| 2251 | } |
| 2252 | st = seq->private; |
| 2253 | |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 2254 | if (sk->sk_state == TCP_TIME_WAIT) |
| 2255 | get_timewait4_sock(v, seq, st->num); |
| 2256 | else if (sk->sk_state == TCP_NEW_SYN_RECV) |
Eric Dumazet | aa3a0c8 | 2015-10-02 11:43:30 -0700 | [diff] [blame] | 2257 | get_openreq4(v, seq, st->num); |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 2258 | else |
| 2259 | get_tcp4_sock(v, seq, st->num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2260 | out: |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2261 | seq_pad(seq, '\n'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2262 | return 0; |
| 2263 | } |
| 2264 | |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2265 | static const struct file_operations tcp_afinfo_seq_fops = { |
| 2266 | .owner = THIS_MODULE, |
| 2267 | .open = tcp_seq_open, |
| 2268 | .read = seq_read, |
| 2269 | .llseek = seq_lseek, |
| 2270 | .release = seq_release_net |
| 2271 | }; |
| 2272 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2273 | static struct tcp_seq_afinfo tcp4_seq_afinfo = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2274 | .name = "tcp", |
| 2275 | .family = AF_INET, |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2276 | .seq_fops = &tcp_afinfo_seq_fops, |
Denis V. Lunev | 9427c4b | 2008-04-13 22:12:13 -0700 | [diff] [blame] | 2277 | .seq_ops = { |
| 2278 | .show = tcp4_seq_show, |
| 2279 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2280 | }; |
| 2281 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2282 | static int __net_init tcp4_proc_init_net(struct net *net) |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2283 | { |
| 2284 | return tcp_proc_register(net, &tcp4_seq_afinfo); |
| 2285 | } |
| 2286 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2287 | static void __net_exit tcp4_proc_exit_net(struct net *net) |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2288 | { |
| 2289 | tcp_proc_unregister(net, &tcp4_seq_afinfo); |
| 2290 | } |
| 2291 | |
| 2292 | static struct pernet_operations tcp4_net_ops = { |
| 2293 | .init = tcp4_proc_init_net, |
| 2294 | .exit = tcp4_proc_exit_net, |
| 2295 | }; |
| 2296 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2297 | int __init tcp4_proc_init(void) |
| 2298 | { |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2299 | return register_pernet_subsys(&tcp4_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2300 | } |
| 2301 | |
| 2302 | void tcp4_proc_exit(void) |
| 2303 | { |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2304 | unregister_pernet_subsys(&tcp4_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2305 | } |
| 2306 | #endif /* CONFIG_PROC_FS */ |
| 2307 | |
| 2308 | struct proto tcp_prot = { |
| 2309 | .name = "TCP", |
| 2310 | .owner = THIS_MODULE, |
| 2311 | .close = tcp_close, |
| 2312 | .connect = tcp_v4_connect, |
| 2313 | .disconnect = tcp_disconnect, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2314 | .accept = inet_csk_accept, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2315 | .ioctl = tcp_ioctl, |
| 2316 | .init = tcp_v4_init_sock, |
| 2317 | .destroy = tcp_v4_destroy_sock, |
| 2318 | .shutdown = tcp_shutdown, |
| 2319 | .setsockopt = tcp_setsockopt, |
| 2320 | .getsockopt = tcp_getsockopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2321 | .recvmsg = tcp_recvmsg, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 2322 | .sendmsg = tcp_sendmsg, |
| 2323 | .sendpage = tcp_sendpage, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2324 | .backlog_rcv = tcp_v4_do_rcv, |
Eric Dumazet | 46d3cea | 2012-07-11 05:50:31 +0000 | [diff] [blame] | 2325 | .release_cb = tcp_release_cb, |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 2326 | .hash = inet_hash, |
| 2327 | .unhash = inet_unhash, |
| 2328 | .get_port = inet_csk_get_port, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2329 | .enter_memory_pressure = tcp_enter_memory_pressure, |
Eric Dumazet | c9bee3b7 | 2013-07-22 20:27:07 -0700 | [diff] [blame] | 2330 | .stream_memory_free = tcp_stream_memory_free, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2331 | .sockets_allocated = &tcp_sockets_allocated, |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 2332 | .orphan_count = &tcp_orphan_count, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2333 | .memory_allocated = &tcp_memory_allocated, |
| 2334 | .memory_pressure = &tcp_memory_pressure, |
Eric W. Biederman | a4fe34b | 2013-10-19 16:25:36 -0700 | [diff] [blame] | 2335 | .sysctl_mem = sysctl_tcp_mem, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2336 | .sysctl_wmem = sysctl_tcp_wmem, |
| 2337 | .sysctl_rmem = sysctl_tcp_rmem, |
| 2338 | .max_header = MAX_TCP_HEADER, |
| 2339 | .obj_size = sizeof(struct tcp_sock), |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2340 | .slab_flags = SLAB_DESTROY_BY_RCU, |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2341 | .twsk_prot = &tcp_timewait_sock_ops, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 2342 | .rsk_prot = &tcp_request_sock_ops, |
Pavel Emelyanov | 39d8cda | 2008-03-22 16:50:58 -0700 | [diff] [blame] | 2343 | .h.hashinfo = &tcp_hashinfo, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 2344 | .no_autobind = true, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2345 | #ifdef CONFIG_COMPAT |
| 2346 | .compat_setsockopt = compat_tcp_setsockopt, |
| 2347 | .compat_getsockopt = compat_tcp_getsockopt, |
| 2348 | #endif |
Lorenzo Colitti | c1e64e2 | 2015-12-16 12:30:05 +0900 | [diff] [blame] | 2349 | .diag_destroy = tcp_abort, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2350 | }; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2351 | EXPORT_SYMBOL(tcp_prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2352 | |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2353 | static void __net_exit tcp_sk_exit(struct net *net) |
| 2354 | { |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 2355 | int cpu; |
| 2356 | |
| 2357 | for_each_possible_cpu(cpu) |
| 2358 | inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv4.tcp_sk, cpu)); |
| 2359 | free_percpu(net->ipv4.tcp_sk); |
| 2360 | } |
| 2361 | |
| 2362 | static int __net_init tcp_sk_init(struct net *net) |
| 2363 | { |
| 2364 | int res, cpu; |
| 2365 | |
| 2366 | net->ipv4.tcp_sk = alloc_percpu(struct sock *); |
| 2367 | if (!net->ipv4.tcp_sk) |
| 2368 | return -ENOMEM; |
| 2369 | |
| 2370 | for_each_possible_cpu(cpu) { |
| 2371 | struct sock *sk; |
| 2372 | |
| 2373 | res = inet_ctl_sock_create(&sk, PF_INET, SOCK_RAW, |
| 2374 | IPPROTO_TCP, net); |
| 2375 | if (res) |
| 2376 | goto fail; |
| 2377 | *per_cpu_ptr(net->ipv4.tcp_sk, cpu) = sk; |
| 2378 | } |
Daniel Borkmann | 4921355 | 2015-05-19 21:04:22 +0200 | [diff] [blame] | 2379 | |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 2380 | net->ipv4.sysctl_tcp_ecn = 2; |
Daniel Borkmann | 4921355 | 2015-05-19 21:04:22 +0200 | [diff] [blame] | 2381 | net->ipv4.sysctl_tcp_ecn_fallback = 1; |
| 2382 | |
Fan Du | b0f9ca5 | 2015-02-10 09:53:16 +0800 | [diff] [blame] | 2383 | net->ipv4.sysctl_tcp_base_mss = TCP_BASE_MSS; |
Fan Du | 6b58e0a | 2015-03-06 11:18:23 +0800 | [diff] [blame] | 2384 | net->ipv4.sysctl_tcp_probe_threshold = TCP_PROBE_THRESHOLD; |
Fan Du | 05cbc0d | 2015-03-06 11:18:24 +0800 | [diff] [blame] | 2385 | net->ipv4.sysctl_tcp_probe_interval = TCP_PROBE_INTERVAL; |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 2386 | |
Nikolay Borisov | 13b287e | 2016-01-07 16:38:43 +0200 | [diff] [blame] | 2387 | net->ipv4.sysctl_tcp_keepalive_time = TCP_KEEPALIVE_TIME; |
Nikolay Borisov | 9bd6861 | 2016-01-07 16:38:44 +0200 | [diff] [blame] | 2388 | net->ipv4.sysctl_tcp_keepalive_probes = TCP_KEEPALIVE_PROBES; |
Nikolay Borisov | b840d15 | 2016-01-07 16:38:45 +0200 | [diff] [blame] | 2389 | net->ipv4.sysctl_tcp_keepalive_intvl = TCP_KEEPALIVE_INTVL; |
Nikolay Borisov | 13b287e | 2016-01-07 16:38:43 +0200 | [diff] [blame] | 2390 | |
Daniel Borkmann | 4921355 | 2015-05-19 21:04:22 +0200 | [diff] [blame] | 2391 | return 0; |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 2392 | fail: |
| 2393 | tcp_sk_exit(net); |
| 2394 | |
| 2395 | return res; |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 2396 | } |
| 2397 | |
| 2398 | static void __net_exit tcp_sk_exit_batch(struct list_head *net_exit_list) |
| 2399 | { |
| 2400 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET); |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2401 | } |
| 2402 | |
| 2403 | static struct pernet_operations __net_initdata tcp_sk_ops = { |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 2404 | .init = tcp_sk_init, |
| 2405 | .exit = tcp_sk_exit, |
| 2406 | .exit_batch = tcp_sk_exit_batch, |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2407 | }; |
| 2408 | |
Denis V. Lunev | 9b0f976 | 2008-02-29 11:13:15 -0800 | [diff] [blame] | 2409 | void __init tcp_v4_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2410 | { |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2411 | inet_hashinfo_init(&tcp_hashinfo); |
Eric W. Biederman | 6a1b305 | 2009-02-22 00:10:18 -0800 | [diff] [blame] | 2412 | if (register_pernet_subsys(&tcp_sk_ops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2413 | panic("Failed to create the TCP control socket.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2414 | } |