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> |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 75 | #include <net/netdma.h> |
David S. Miller | 6e5714e | 2011-08-03 20:50:44 -0700 | [diff] [blame] | 76 | #include <net/secure_seq.h> |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 77 | #include <net/tcp_memcontrol.h> |
Eliezer Tamir | 076bb0c | 2013-07-10 17:13:17 +0300 | [diff] [blame] | 78 | #include <net/busy_poll.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
| 80 | #include <linux/inet.h> |
| 81 | #include <linux/ipv6.h> |
| 82 | #include <linux/stddef.h> |
| 83 | #include <linux/proc_fs.h> |
| 84 | #include <linux/seq_file.h> |
| 85 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 86 | #include <linux/crypto.h> |
| 87 | #include <linux/scatterlist.h> |
| 88 | |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 89 | int sysctl_tcp_tw_reuse __read_mostly; |
| 90 | int sysctl_tcp_low_latency __read_mostly; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 91 | EXPORT_SYMBOL(sysctl_tcp_low_latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 94 | #ifdef CONFIG_TCP_MD5SIG |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 95 | 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] | 96 | __be32 daddr, __be32 saddr, const struct tcphdr *th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 97 | #endif |
| 98 | |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 99 | struct inet_hashinfo tcp_hashinfo; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 100 | EXPORT_SYMBOL(tcp_hashinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 102 | static inline __u32 tcp_v4_init_sequence(const struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 104 | return secure_tcp_sequence_number(ip_hdr(skb)->daddr, |
| 105 | ip_hdr(skb)->saddr, |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 106 | tcp_hdr(skb)->dest, |
| 107 | tcp_hdr(skb)->source); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | } |
| 109 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 110 | int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp) |
| 111 | { |
| 112 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sktw); |
| 113 | struct tcp_sock *tp = tcp_sk(sk); |
| 114 | |
| 115 | /* With PAWS, it is safe from the viewpoint |
| 116 | of data integrity. Even without PAWS it is safe provided sequence |
| 117 | spaces do not overlap i.e. at data rates <= 80Mbit/sec. |
| 118 | |
| 119 | Actually, the idea is close to VJ's one, only timestamp cache is |
| 120 | held not per host, but per port pair and TW bucket is used as state |
| 121 | holder. |
| 122 | |
| 123 | If TW bucket has been already destroyed we fall back to VJ's scheme |
| 124 | and use initial timestamp retrieved from peer table. |
| 125 | */ |
| 126 | if (tcptw->tw_ts_recent_stamp && |
| 127 | (twp == NULL || (sysctl_tcp_tw_reuse && |
James Morris | 9d729f7 | 2007-03-04 16:12:44 -0800 | [diff] [blame] | 128 | get_seconds() - tcptw->tw_ts_recent_stamp > 1))) { |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 129 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; |
| 130 | if (tp->write_seq == 0) |
| 131 | tp->write_seq = 1; |
| 132 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; |
| 133 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; |
| 134 | sock_hold(sktw); |
| 135 | return 1; |
| 136 | } |
| 137 | |
| 138 | return 0; |
| 139 | } |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 140 | EXPORT_SYMBOL_GPL(tcp_twsk_unique); |
| 141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | /* This will initiate an outgoing connection. */ |
| 143 | int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
| 144 | { |
David S. Miller | 2d7192d | 2011-04-26 13:28:44 -0700 | [diff] [blame] | 145 | struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | struct inet_sock *inet = inet_sk(sk); |
| 147 | struct tcp_sock *tp = tcp_sk(sk); |
David S. Miller | dca8b08 | 2011-02-24 13:38:12 -0800 | [diff] [blame] | 148 | __be16 orig_sport, orig_dport; |
Al Viro | bada8ad | 2006-09-26 21:27:15 -0700 | [diff] [blame] | 149 | __be32 daddr, nexthop; |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 150 | struct flowi4 *fl4; |
David S. Miller | 2d7192d | 2011-04-26 13:28:44 -0700 | [diff] [blame] | 151 | struct rtable *rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | int err; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 153 | struct ip_options_rcu *inet_opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
| 155 | if (addr_len < sizeof(struct sockaddr_in)) |
| 156 | return -EINVAL; |
| 157 | |
| 158 | if (usin->sin_family != AF_INET) |
| 159 | return -EAFNOSUPPORT; |
| 160 | |
| 161 | nexthop = daddr = usin->sin_addr.s_addr; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 162 | inet_opt = rcu_dereference_protected(inet->inet_opt, |
| 163 | sock_owned_by_user(sk)); |
| 164 | if (inet_opt && inet_opt->opt.srr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | if (!daddr) |
| 166 | return -EINVAL; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 167 | nexthop = inet_opt->opt.faddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | } |
| 169 | |
David S. Miller | dca8b08 | 2011-02-24 13:38:12 -0800 | [diff] [blame] | 170 | orig_sport = inet->inet_sport; |
| 171 | orig_dport = usin->sin_port; |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 172 | fl4 = &inet->cork.fl.u.ip4; |
| 173 | rt = ip_route_connect(fl4, nexthop, inet->inet_saddr, |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 174 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, |
| 175 | IPPROTO_TCP, |
Steffen Klassert | 0e0d44a | 2013-08-28 08:04:14 +0200 | [diff] [blame] | 176 | orig_sport, orig_dport, sk); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 177 | if (IS_ERR(rt)) { |
| 178 | err = PTR_ERR(rt); |
| 179 | if (err == -ENETUNREACH) |
Eric Dumazet | f1d8cba | 2013-11-28 09:51:22 -0800 | [diff] [blame] | 180 | IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 181 | return err; |
Wei Dong | 584bdf8 | 2007-05-31 22:49:28 -0700 | [diff] [blame] | 182 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
| 184 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { |
| 185 | ip_rt_put(rt); |
| 186 | return -ENETUNREACH; |
| 187 | } |
| 188 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 189 | if (!inet_opt || !inet_opt->opt.srr) |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 190 | daddr = fl4->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 192 | if (!inet->inet_saddr) |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 193 | inet->inet_saddr = fl4->saddr; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 194 | inet->inet_rcv_saddr = inet->inet_saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 196 | if (tp->rx_opt.ts_recent_stamp && inet->inet_daddr != daddr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | /* Reset inherited state */ |
| 198 | tp->rx_opt.ts_recent = 0; |
| 199 | tp->rx_opt.ts_recent_stamp = 0; |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 200 | if (likely(!tp->repair)) |
| 201 | tp->write_seq = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | } |
| 203 | |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 204 | if (tcp_death_row.sysctl_tw_recycle && |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 205 | !tp->rx_opt.ts_recent_stamp && fl4->daddr == daddr) |
| 206 | tcp_fetch_timewait_stamp(sk, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 208 | inet->inet_dport = usin->sin_port; |
| 209 | inet->inet_daddr = daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 211 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 212 | if (inet_opt) |
| 213 | inet_csk(sk)->icsk_ext_hdr_len = inet_opt->opt.optlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
William Allen Simpson | bee7ca9 | 2009-11-10 09:51:18 +0000 | [diff] [blame] | 215 | tp->rx_opt.mss_clamp = TCP_MSS_DEFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
| 217 | /* Socket identity is still unknown (sport may be zero). |
| 218 | * However we set state to SYN-SENT and not releasing socket |
| 219 | * lock select source port, enter ourselves into the hash tables and |
| 220 | * complete initialization after this. |
| 221 | */ |
| 222 | tcp_set_state(sk, TCP_SYN_SENT); |
Arnaldo Carvalho de Melo | a7f5e7f | 2005-12-13 23:25:31 -0800 | [diff] [blame] | 223 | err = inet_hash_connect(&tcp_death_row, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | if (err) |
| 225 | goto failure; |
| 226 | |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 227 | rt = ip_route_newports(fl4, rt, orig_sport, orig_dport, |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 228 | inet->inet_sport, inet->inet_dport, sk); |
| 229 | if (IS_ERR(rt)) { |
| 230 | err = PTR_ERR(rt); |
| 231 | rt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | goto failure; |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 233 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | /* OK, now commit destination to socket. */ |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 235 | sk->sk_gso_type = SKB_GSO_TCPV4; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 236 | sk_setup_caps(sk, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 238 | if (!tp->write_seq && likely(!tp->repair)) |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 239 | tp->write_seq = secure_tcp_sequence_number(inet->inet_saddr, |
| 240 | inet->inet_daddr, |
| 241 | inet->inet_sport, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | usin->sin_port); |
| 243 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 244 | inet->inet_id = tp->write_seq ^ jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
Andrey Vagin | 2b91647 | 2012-11-22 01:13:58 +0000 | [diff] [blame] | 246 | err = tcp_connect(sk); |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | rt = NULL; |
| 249 | if (err) |
| 250 | goto failure; |
| 251 | |
| 252 | return 0; |
| 253 | |
| 254 | failure: |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 255 | /* |
| 256 | * This unhashes the socket and releases the local port, |
| 257 | * if necessary. |
| 258 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | tcp_set_state(sk, TCP_CLOSE); |
| 260 | ip_rt_put(rt); |
| 261 | sk->sk_route_caps = 0; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 262 | inet->inet_dport = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | return err; |
| 264 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 265 | EXPORT_SYMBOL(tcp_v4_connect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | /* |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 268 | * This routine reacts to ICMP_FRAG_NEEDED mtu indications as defined in RFC1191. |
| 269 | * It can be called through tcp_release_cb() if socket was owned by user |
| 270 | * at the time tcp_v4_err() was called to handle ICMP message. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | */ |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 272 | static void tcp_v4_mtu_reduced(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | { |
| 274 | struct dst_entry *dst; |
| 275 | struct inet_sock *inet = inet_sk(sk); |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 276 | u32 mtu = tcp_sk(sk)->mtu_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | |
David S. Miller | 80d0a69 | 2012-07-16 03:28:06 -0700 | [diff] [blame] | 278 | dst = inet_csk_update_pmtu(sk, mtu); |
| 279 | if (!dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | return; |
| 281 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | /* Something is about to be wrong... Remember soft error |
| 283 | * for the case, if this connection will not able to recover. |
| 284 | */ |
| 285 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) |
| 286 | sk->sk_err_soft = EMSGSIZE; |
| 287 | |
| 288 | mtu = dst_mtu(dst); |
| 289 | |
| 290 | if (inet->pmtudisc != IP_PMTUDISC_DONT && |
Hannes Frederic Sowa | 482fc60 | 2013-11-05 02:24:17 +0100 | [diff] [blame] | 291 | ip_sk_accept_pmtu(sk) && |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 292 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | tcp_sync_mss(sk, mtu); |
| 294 | |
| 295 | /* Resend the TCP packet because it's |
| 296 | * clear that the old packet has been |
| 297 | * dropped. This is the new "fast" path mtu |
| 298 | * discovery. |
| 299 | */ |
| 300 | tcp_simple_retransmit(sk); |
| 301 | } /* else let the usual retransmit timer handle it */ |
| 302 | } |
| 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | /* |
| 313 | * This routine is called by the ICMP module when it gets some |
| 314 | * sort of error condition. If err < 0 then the socket should |
| 315 | * be closed and the error returned to the user. If err > 0 |
| 316 | * it's just the icmp type << 8 | icmp code. After adjustment |
| 317 | * header points to the first 8 bytes of the tcp header. We need |
| 318 | * to find the appropriate port. |
| 319 | * |
| 320 | * The locking strategy used here is very "optimistic". When |
| 321 | * someone else accesses the socket the ICMP is just dropped |
| 322 | * and for some paths there is no check at all. |
| 323 | * A more general error queue to queue errors for later handling |
| 324 | * is probably better. |
| 325 | * |
| 326 | */ |
| 327 | |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 328 | void tcp_v4_err(struct sk_buff *icmp_skb, u32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 330 | const struct iphdr *iph = (const struct iphdr *)icmp_skb->data; |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 331 | struct tcphdr *th = (struct tcphdr *)(icmp_skb->data + (iph->ihl << 2)); |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 332 | struct inet_connection_sock *icsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | struct tcp_sock *tp; |
| 334 | struct inet_sock *inet; |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 335 | const int type = icmp_hdr(icmp_skb)->type; |
| 336 | const int code = icmp_hdr(icmp_skb)->code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | struct sock *sk; |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 338 | struct sk_buff *skb; |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 339 | struct request_sock *req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | __u32 seq; |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 341 | __u32 remaining; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | int err; |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 343 | struct net *net = dev_net(icmp_skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 345 | if (icmp_skb->len < (iph->ihl << 2) + 8) { |
Pavel Emelyanov | dcfc23c | 2008-07-14 23:03:00 -0700 | [diff] [blame] | 346 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | return; |
| 348 | } |
| 349 | |
Pavel Emelyanov | fd54d71 | 2008-07-14 23:01:40 -0700 | [diff] [blame] | 350 | sk = inet_lookup(net, &tcp_hashinfo, iph->daddr, th->dest, |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 351 | iph->saddr, th->source, inet_iif(icmp_skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | if (!sk) { |
Pavel Emelyanov | dcfc23c | 2008-07-14 23:03:00 -0700 | [diff] [blame] | 353 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | return; |
| 355 | } |
| 356 | if (sk->sk_state == TCP_TIME_WAIT) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 357 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | return; |
| 359 | } |
| 360 | |
| 361 | bh_lock_sock(sk); |
| 362 | /* If too many ICMPs get dropped on busy |
| 363 | * servers this needs to be solved differently. |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 364 | * We do take care of PMTU discovery (RFC1191) special case : |
| 365 | * we can receive locally generated ICMP messages while socket is held. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | */ |
Eric Dumazet | b74aa93 | 2013-01-19 16:10:37 +0000 | [diff] [blame] | 367 | if (sock_owned_by_user(sk)) { |
| 368 | if (!(type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)) |
| 369 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
| 370 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | if (sk->sk_state == TCP_CLOSE) |
| 372 | goto out; |
| 373 | |
stephen hemminger | 97e3ecd1 | 2010-03-18 11:27:32 +0000 | [diff] [blame] | 374 | if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { |
| 375 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); |
| 376 | goto out; |
| 377 | } |
| 378 | |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 379 | icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | tp = tcp_sk(sk); |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 381 | req = tp->fastopen_rsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | seq = ntohl(th->seq); |
| 383 | if (sk->sk_state != TCP_LISTEN && |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 384 | !between(seq, tp->snd_una, tp->snd_nxt) && |
| 385 | (req == NULL || seq != tcp_rsk(req)->snt_isn)) { |
| 386 | /* For a Fast Open socket, allow seq to be snt_isn. */ |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 387 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | goto out; |
| 389 | } |
| 390 | |
| 391 | switch (type) { |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 392 | case ICMP_REDIRECT: |
| 393 | do_redirect(icmp_skb, sk); |
| 394 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | case ICMP_SOURCE_QUENCH: |
| 396 | /* Just silently ignore these. */ |
| 397 | goto out; |
| 398 | case ICMP_PARAMETERPROB: |
| 399 | err = EPROTO; |
| 400 | break; |
| 401 | case ICMP_DEST_UNREACH: |
| 402 | if (code > NR_ICMP_UNREACH) |
| 403 | goto out; |
| 404 | |
| 405 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ |
Eric Dumazet | 0d4f060 | 2013-03-18 07:01:28 +0000 | [diff] [blame] | 406 | /* We are not interested in TCP_LISTEN and open_requests |
| 407 | * (SYN-ACKs send out by Linux are always <576bytes so |
| 408 | * they should go through unfragmented). |
| 409 | */ |
| 410 | if (sk->sk_state == TCP_LISTEN) |
| 411 | goto out; |
| 412 | |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 413 | tp->mtu_info = info; |
Eric Dumazet | 144d56e | 2012-08-20 00:22:46 +0000 | [diff] [blame] | 414 | if (!sock_owned_by_user(sk)) { |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 415 | tcp_v4_mtu_reduced(sk); |
Eric Dumazet | 144d56e | 2012-08-20 00:22:46 +0000 | [diff] [blame] | 416 | } else { |
| 417 | if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, &tp->tsq_flags)) |
| 418 | sock_hold(sk); |
| 419 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | goto out; |
| 421 | } |
| 422 | |
| 423 | err = icmp_err_convert[code].errno; |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 424 | /* check if icmp_skb allows revert of backoff |
| 425 | * (see draft-zimmermann-tcp-lcd) */ |
| 426 | if (code != ICMP_NET_UNREACH && code != ICMP_HOST_UNREACH) |
| 427 | break; |
| 428 | if (seq != tp->snd_una || !icsk->icsk_retransmits || |
| 429 | !icsk->icsk_backoff) |
| 430 | break; |
| 431 | |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 432 | /* XXX (TFO) - revisit the following logic for TFO */ |
| 433 | |
David S. Miller | 8f49c27 | 2010-11-12 13:35:00 -0800 | [diff] [blame] | 434 | if (sock_owned_by_user(sk)) |
| 435 | break; |
| 436 | |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 437 | icsk->icsk_backoff--; |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 438 | inet_csk(sk)->icsk_rto = (tp->srtt_us ? __tcp_set_rto(tp) : |
Jerry Chu | 9ad7c04 | 2011-06-08 11:08:38 +0000 | [diff] [blame] | 439 | TCP_TIMEOUT_INIT) << icsk->icsk_backoff; |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 440 | tcp_bound_rto(sk); |
| 441 | |
| 442 | skb = tcp_write_queue_head(sk); |
| 443 | BUG_ON(!skb); |
| 444 | |
| 445 | remaining = icsk->icsk_rto - min(icsk->icsk_rto, |
| 446 | tcp_time_stamp - TCP_SKB_CB(skb)->when); |
| 447 | |
| 448 | if (remaining) { |
| 449 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, |
| 450 | remaining, TCP_RTO_MAX); |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 451 | } else { |
| 452 | /* RTO revert clocked out retransmission. |
| 453 | * Will retransmit now */ |
| 454 | tcp_retransmit_timer(sk); |
| 455 | } |
| 456 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | break; |
| 458 | case ICMP_TIME_EXCEEDED: |
| 459 | err = EHOSTUNREACH; |
| 460 | break; |
| 461 | default: |
| 462 | goto out; |
| 463 | } |
| 464 | |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 465 | /* XXX (TFO) - if it's a TFO socket and has been accepted, rather |
| 466 | * than following the TCP_SYN_RECV case and closing the socket, |
| 467 | * we ignore the ICMP error and keep trying like a fully established |
| 468 | * socket. Is this the right thing to do? |
| 469 | */ |
| 470 | if (req && req->sk == NULL) |
| 471 | goto out; |
| 472 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | switch (sk->sk_state) { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 474 | struct request_sock *req, **prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | case TCP_LISTEN: |
| 476 | if (sock_owned_by_user(sk)) |
| 477 | goto out; |
| 478 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 479 | req = inet_csk_search_req(sk, &prev, th->dest, |
| 480 | iph->daddr, iph->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | if (!req) |
| 482 | goto out; |
| 483 | |
| 484 | /* ICMPs are not backlogged, hence we cannot get |
| 485 | an established socket here. |
| 486 | */ |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 487 | WARN_ON(req->sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 489 | if (seq != tcp_rsk(req)->snt_isn) { |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 490 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | goto out; |
| 492 | } |
| 493 | |
| 494 | /* |
| 495 | * Still in SYN_RECV, just remove it silently. |
| 496 | * There is no good way to pass the error to the newly |
| 497 | * created socket, and POSIX does not want network |
| 498 | * errors returned from accept(). |
| 499 | */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 500 | inet_csk_reqsk_queue_drop(sk, req, prev); |
Vijay Subramanian | 848bf15 | 2013-01-31 08:24:06 +0000 | [diff] [blame] | 501 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | goto out; |
| 503 | |
| 504 | case TCP_SYN_SENT: |
| 505 | case TCP_SYN_RECV: /* Cannot happen. |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 506 | It can f.e. if SYNs crossed, |
| 507 | or Fast Open. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | */ |
| 509 | if (!sock_owned_by_user(sk)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | sk->sk_err = err; |
| 511 | |
| 512 | sk->sk_error_report(sk); |
| 513 | |
| 514 | tcp_done(sk); |
| 515 | } else { |
| 516 | sk->sk_err_soft = err; |
| 517 | } |
| 518 | goto out; |
| 519 | } |
| 520 | |
| 521 | /* If we've already connected we will keep trying |
| 522 | * until we time out, or the user gives up. |
| 523 | * |
| 524 | * rfc1122 4.2.3.9 allows to consider as hard errors |
| 525 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, |
| 526 | * but it is obsoleted by pmtu discovery). |
| 527 | * |
| 528 | * Note, that in modern internet, where routing is unreliable |
| 529 | * and in each dark corner broken firewalls sit, sending random |
| 530 | * errors ordered by their masters even this two messages finally lose |
| 531 | * their original sense (even Linux sends invalid PORT_UNREACHs) |
| 532 | * |
| 533 | * Now we are in compliance with RFCs. |
| 534 | * --ANK (980905) |
| 535 | */ |
| 536 | |
| 537 | inet = inet_sk(sk); |
| 538 | if (!sock_owned_by_user(sk) && inet->recverr) { |
| 539 | sk->sk_err = err; |
| 540 | sk->sk_error_report(sk); |
| 541 | } else { /* Only an error on timeout */ |
| 542 | sk->sk_err_soft = err; |
| 543 | } |
| 544 | |
| 545 | out: |
| 546 | bh_unlock_sock(sk); |
| 547 | sock_put(sk); |
| 548 | } |
| 549 | |
Daniel Borkmann | 28850dc | 2013-06-07 05:11:46 +0000 | [diff] [blame] | 550 | 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] | 551 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 552 | struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 554 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 555 | th->check = ~tcp_v4_check(skb->len, saddr, daddr, 0); |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 556 | skb->csum_start = skb_transport_header(skb) - skb->head; |
Al Viro | ff1dcad | 2006-11-20 18:07:29 -0800 | [diff] [blame] | 557 | skb->csum_offset = offsetof(struct tcphdr, check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | } else { |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 559 | th->check = tcp_v4_check(skb->len, saddr, daddr, |
Joe Perches | 07f0757 | 2008-11-19 15:44:53 -0800 | [diff] [blame] | 560 | csum_partial(th, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | th->doff << 2, |
| 562 | skb->csum)); |
| 563 | } |
| 564 | } |
| 565 | |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 566 | /* This routine computes an IPv4 TCP checksum. */ |
Herbert Xu | bb29624 | 2010-04-11 02:15:55 +0000 | [diff] [blame] | 567 | void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb) |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 568 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 569 | const struct inet_sock *inet = inet_sk(sk); |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 570 | |
| 571 | __tcp_v4_send_check(skb, inet->inet_saddr, inet->inet_daddr); |
| 572 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 573 | EXPORT_SYMBOL(tcp_v4_send_check); |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 574 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | /* |
| 576 | * This routine will send an RST to the other tcp. |
| 577 | * |
| 578 | * Someone asks: why I NEVER use socket parameters (TOS, TTL etc.) |
| 579 | * for reset. |
| 580 | * Answer: if a packet caused RST, it is not for a socket |
| 581 | * existing in our system, if it is matched to a socket, |
| 582 | * it is just duplicate segment or bug in other side's TCP. |
| 583 | * So that we build reply only basing on parameters |
| 584 | * arrived with segment. |
| 585 | * Exception: precedence violation. We do not implement it in any case. |
| 586 | */ |
| 587 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 588 | static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 590 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 591 | struct { |
| 592 | struct tcphdr th; |
| 593 | #ifdef CONFIG_TCP_MD5SIG |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 594 | __be32 opt[(TCPOLEN_MD5SIG_ALIGNED >> 2)]; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 595 | #endif |
| 596 | } rep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | struct ip_reply_arg arg; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 598 | #ifdef CONFIG_TCP_MD5SIG |
| 599 | struct tcp_md5sig_key *key; |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 600 | const __u8 *hash_location = NULL; |
| 601 | unsigned char newhash[16]; |
| 602 | int genhash; |
| 603 | struct sock *sk1 = NULL; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 604 | #endif |
Pavel Emelyanov | a86b1e3 | 2008-07-16 20:20:58 -0700 | [diff] [blame] | 605 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
| 607 | /* Never send a reset in response to a reset. */ |
| 608 | if (th->rst) |
| 609 | return; |
| 610 | |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 611 | if (skb_rtable(skb)->rt_type != RTN_LOCAL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | return; |
| 613 | |
| 614 | /* Swap the send and the receive. */ |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 615 | memset(&rep, 0, sizeof(rep)); |
| 616 | rep.th.dest = th->source; |
| 617 | rep.th.source = th->dest; |
| 618 | rep.th.doff = sizeof(struct tcphdr) / 4; |
| 619 | rep.th.rst = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | |
| 621 | if (th->ack) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 622 | rep.th.seq = th->ack_seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 624 | rep.th.ack = 1; |
| 625 | rep.th.ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin + |
| 626 | skb->len - (th->doff << 2)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | } |
| 628 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 629 | memset(&arg, 0, sizeof(arg)); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 630 | arg.iov[0].iov_base = (unsigned char *)&rep; |
| 631 | arg.iov[0].iov_len = sizeof(rep.th); |
| 632 | |
| 633 | #ifdef CONFIG_TCP_MD5SIG |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 634 | hash_location = tcp_parse_md5sig_option(th); |
| 635 | if (!sk && hash_location) { |
| 636 | /* |
| 637 | * active side is lost. Try to find listening socket through |
| 638 | * source port, and then find md5 key through listening socket. |
| 639 | * we are not loose security here: |
| 640 | * Incoming packet is checked with md5 hash with finding key, |
| 641 | * no RST generated if md5 hash doesn't match. |
| 642 | */ |
| 643 | sk1 = __inet_lookup_listener(dev_net(skb_dst(skb)->dev), |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 644 | &tcp_hashinfo, ip_hdr(skb)->saddr, |
| 645 | th->source, ip_hdr(skb)->daddr, |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 646 | ntohs(th->source), inet_iif(skb)); |
| 647 | /* don't send rst if it can't find key */ |
| 648 | if (!sk1) |
| 649 | return; |
| 650 | rcu_read_lock(); |
| 651 | key = tcp_md5_do_lookup(sk1, (union tcp_md5_addr *) |
| 652 | &ip_hdr(skb)->saddr, AF_INET); |
| 653 | if (!key) |
| 654 | goto release_sk1; |
| 655 | |
| 656 | genhash = tcp_v4_md5_hash_skb(newhash, key, NULL, NULL, skb); |
| 657 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
| 658 | goto release_sk1; |
| 659 | } else { |
| 660 | key = sk ? tcp_md5_do_lookup(sk, (union tcp_md5_addr *) |
| 661 | &ip_hdr(skb)->saddr, |
| 662 | AF_INET) : NULL; |
| 663 | } |
| 664 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 665 | if (key) { |
| 666 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | |
| 667 | (TCPOPT_NOP << 16) | |
| 668 | (TCPOPT_MD5SIG << 8) | |
| 669 | TCPOLEN_MD5SIG); |
| 670 | /* Update length and the length the header thinks exists */ |
| 671 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; |
| 672 | rep.th.doff = arg.iov[0].iov_len / 4; |
| 673 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 674 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[1], |
Ilpo Järvinen | 78e645cb | 2008-10-09 14:37:47 -0700 | [diff] [blame] | 675 | key, ip_hdr(skb)->saddr, |
| 676 | ip_hdr(skb)->daddr, &rep.th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 677 | } |
| 678 | #endif |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 679 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
| 680 | ip_hdr(skb)->saddr, /* XXX */ |
Ilpo Järvinen | 52cd575 | 2008-10-08 11:34:06 -0700 | [diff] [blame] | 681 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 683 | arg.flags = (sk && inet_sk(sk)->transparent) ? IP_REPLY_ARG_NOSRCCHECK : 0; |
Shawn Lu | e2446ea | 2012-02-04 12:38:09 +0000 | [diff] [blame] | 684 | /* When socket is gone, all binding information is lost. |
Alexey Kuznetsov | 4c67525 | 2012-10-12 04:34:17 +0000 | [diff] [blame] | 685 | * routing might fail in this case. No choice here, if we choose to force |
| 686 | * input interface, we will misroute in case of asymmetric route. |
Shawn Lu | e2446ea | 2012-02-04 12:38:09 +0000 | [diff] [blame] | 687 | */ |
Alexey Kuznetsov | 4c67525 | 2012-10-12 04:34:17 +0000 | [diff] [blame] | 688 | if (sk) |
| 689 | arg.bound_dev_if = sk->sk_bound_dev_if; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 691 | net = dev_net(skb_dst(skb)->dev); |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 692 | arg.tos = ip_hdr(skb)->tos; |
Eric Dumazet | be9f4a4 | 2012-07-19 07:34:03 +0000 | [diff] [blame] | 693 | ip_send_unicast_reply(net, skb, ip_hdr(skb)->saddr, |
David S. Miller | 70e7341 | 2012-06-28 03:21:41 -0700 | [diff] [blame] | 694 | ip_hdr(skb)->daddr, &arg, arg.iov[0].iov_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 696 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
| 697 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 698 | |
| 699 | #ifdef CONFIG_TCP_MD5SIG |
| 700 | release_sk1: |
| 701 | if (sk1) { |
| 702 | rcu_read_unlock(); |
| 703 | sock_put(sk1); |
| 704 | } |
| 705 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | } |
| 707 | |
| 708 | /* The code following below sending ACKs in SYN-RECV and TIME-WAIT states |
| 709 | outside socket context is ugly, certainly. What can I do? |
| 710 | */ |
| 711 | |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 712 | static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack, |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 713 | u32 win, u32 tsval, u32 tsecr, int oif, |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 714 | struct tcp_md5sig_key *key, |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 715 | int reply_flags, u8 tos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 717 | const struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | struct { |
| 719 | struct tcphdr th; |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 720 | __be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 721 | #ifdef CONFIG_TCP_MD5SIG |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 722 | + (TCPOLEN_MD5SIG_ALIGNED >> 2) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 723 | #endif |
| 724 | ]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | } rep; |
| 726 | struct ip_reply_arg arg; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 727 | struct net *net = dev_net(skb_dst(skb)->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | |
| 729 | memset(&rep.th, 0, sizeof(struct tcphdr)); |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 730 | memset(&arg, 0, sizeof(arg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | |
| 732 | arg.iov[0].iov_base = (unsigned char *)&rep; |
| 733 | arg.iov[0].iov_len = sizeof(rep.th); |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 734 | if (tsecr) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 735 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| 736 | (TCPOPT_TIMESTAMP << 8) | |
| 737 | TCPOLEN_TIMESTAMP); |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 738 | rep.opt[1] = htonl(tsval); |
| 739 | rep.opt[2] = htonl(tsecr); |
Craig Schlenter | cb48cfe | 2007-01-09 00:11:15 -0800 | [diff] [blame] | 740 | arg.iov[0].iov_len += TCPOLEN_TSTAMP_ALIGNED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | } |
| 742 | |
| 743 | /* Swap the send and the receive. */ |
| 744 | rep.th.dest = th->source; |
| 745 | rep.th.source = th->dest; |
| 746 | rep.th.doff = arg.iov[0].iov_len / 4; |
| 747 | rep.th.seq = htonl(seq); |
| 748 | rep.th.ack_seq = htonl(ack); |
| 749 | rep.th.ack = 1; |
| 750 | rep.th.window = htons(win); |
| 751 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 752 | #ifdef CONFIG_TCP_MD5SIG |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 753 | if (key) { |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 754 | int offset = (tsecr) ? 3 : 0; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 755 | |
| 756 | rep.opt[offset++] = htonl((TCPOPT_NOP << 24) | |
| 757 | (TCPOPT_NOP << 16) | |
| 758 | (TCPOPT_MD5SIG << 8) | |
| 759 | TCPOLEN_MD5SIG); |
| 760 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; |
| 761 | rep.th.doff = arg.iov[0].iov_len/4; |
| 762 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 763 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[offset], |
Adam Langley | 90b7e11 | 2008-07-31 20:49:48 -0700 | [diff] [blame] | 764 | key, ip_hdr(skb)->saddr, |
| 765 | ip_hdr(skb)->daddr, &rep.th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 766 | } |
| 767 | #endif |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 768 | arg.flags = reply_flags; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 769 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
| 770 | ip_hdr(skb)->saddr, /* XXX */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
| 772 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 773 | if (oif) |
| 774 | arg.bound_dev_if = oif; |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 775 | arg.tos = tos; |
Eric Dumazet | be9f4a4 | 2012-07-19 07:34:03 +0000 | [diff] [blame] | 776 | ip_send_unicast_reply(net, skb, ip_hdr(skb)->saddr, |
David S. Miller | 70e7341 | 2012-06-28 03:21:41 -0700 | [diff] [blame] | 777 | ip_hdr(skb)->daddr, &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 | |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 787 | tcp_v4_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 788 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 789 | tcp_time_stamp + tcptw->tw_ts_offset, |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 790 | tcptw->tw_ts_recent, |
| 791 | tw->tw_bound_dev_if, |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 792 | tcp_twsk_md5_key(tcptw), |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 793 | tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0, |
| 794 | tw->tw_tos |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 795 | ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 797 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | } |
| 799 | |
Gui Jianfeng | 6edafaa | 2008-08-06 23:50:04 -0700 | [diff] [blame] | 800 | static void tcp_v4_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 801 | struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | { |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 803 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
| 804 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. |
| 805 | */ |
| 806 | tcp_v4_send_ack(skb, (sk->sk_state == TCP_LISTEN) ? |
| 807 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
| 808 | tcp_rsk(req)->rcv_nxt, req->rcv_wnd, |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 809 | tcp_time_stamp, |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 810 | req->ts_recent, |
| 811 | 0, |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 812 | tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&ip_hdr(skb)->daddr, |
| 813 | AF_INET), |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 814 | inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0, |
| 815 | ip_hdr(skb)->tos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | } |
| 817 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | /* |
Kris Katterjohn | 9bf1d83 | 2008-02-17 22:29:19 -0800 | [diff] [blame] | 819 | * Send a SYN-ACK after having received a SYN. |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 820 | * This still operates on a request_sock only, not on a big |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | * socket. |
| 822 | */ |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 823 | static int tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst, |
| 824 | struct request_sock *req, |
Christoph Paasch | 397b417 | 2013-08-18 17:34:38 +0200 | [diff] [blame] | 825 | u16 queue_mapping) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 827 | const struct inet_request_sock *ireq = inet_rsk(req); |
David S. Miller | 6bd023f | 2011-05-18 18:32:03 -0400 | [diff] [blame] | 828 | struct flowi4 fl4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | int err = -1; |
Weilong Chen | d41db5a | 2013-12-23 14:37:28 +0800 | [diff] [blame] | 830 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | |
| 832 | /* First, grab a route. */ |
David S. Miller | ba3f7f0 | 2012-07-17 14:02:46 -0700 | [diff] [blame] | 833 | if (!dst && (dst = inet_csk_route_req(sk, &fl4, req)) == NULL) |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 834 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | |
Christoph Paasch | 1a2c618 | 2013-03-17 08:23:34 +0000 | [diff] [blame] | 836 | skb = tcp_make_synack(sk, dst, req, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
| 838 | if (skb) { |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 839 | __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] | 840 | |
Eric Dumazet | fff3269 | 2012-06-01 01:47:50 +0000 | [diff] [blame] | 841 | skb_set_queue_mapping(skb, queue_mapping); |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 842 | err = ip_build_and_send_pkt(skb, sk, ireq->ir_loc_addr, |
| 843 | ireq->ir_rmt_addr, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 844 | ireq->opt); |
Gerrit Renker | b9df3cb | 2006-11-14 11:21:36 -0200 | [diff] [blame] | 845 | err = net_xmit_eval(err); |
Neal Cardwell | 016818d | 2012-09-22 04:18:55 +0000 | [diff] [blame] | 846 | if (!tcp_rsk(req)->snt_synack && !err) |
| 847 | tcp_rsk(req)->snt_synack = tcp_time_stamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | } |
| 849 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | return err; |
| 851 | } |
| 852 | |
Christoph Paasch | 1a2c618 | 2013-03-17 08:23:34 +0000 | [diff] [blame] | 853 | static int tcp_v4_rtx_synack(struct sock *sk, struct request_sock *req) |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 854 | { |
Christoph Paasch | 397b417 | 2013-08-18 17:34:38 +0200 | [diff] [blame] | 855 | int res = tcp_v4_send_synack(sk, NULL, req, 0); |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 856 | |
Yuchung Cheng | f19c29e | 2014-03-03 12:31:36 -0800 | [diff] [blame] | 857 | if (!res) { |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 858 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); |
Yuchung Cheng | f19c29e | 2014-03-03 12:31:36 -0800 | [diff] [blame] | 859 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPSYNRETRANS); |
| 860 | } |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 861 | return res; |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 862 | } |
| 863 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | /* |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 865 | * IPv4 request_sock destructor. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | */ |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 867 | static void tcp_v4_reqsk_destructor(struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | { |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 869 | kfree(inet_rsk(req)->opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | } |
| 871 | |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 872 | /* |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 873 | * Return true if a syncookie should be sent |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 874 | */ |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 875 | bool tcp_syn_flood_action(struct sock *sk, |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 876 | const struct sk_buff *skb, |
| 877 | const char *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | { |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 879 | const char *msg = "Dropping request"; |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 880 | bool want_cookie = false; |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 881 | struct listen_sock *lopt; |
| 882 | |
Florian Westphal | 2a1d4bd | 2010-06-03 00:43:12 +0000 | [diff] [blame] | 883 | #ifdef CONFIG_SYN_COOKIES |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 884 | if (sysctl_tcp_syncookies) { |
Florian Westphal | 2a1d4bd | 2010-06-03 00:43:12 +0000 | [diff] [blame] | 885 | msg = "Sending cookies"; |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 886 | want_cookie = true; |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 887 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPREQQFULLDOCOOKIES); |
| 888 | } else |
Arnaldo Carvalho de Melo | 80e40da | 2006-01-04 01:58:06 -0200 | [diff] [blame] | 889 | #endif |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 890 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPREQQFULLDROP); |
Florian Westphal | 2a1d4bd | 2010-06-03 00:43:12 +0000 | [diff] [blame] | 891 | |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 892 | lopt = inet_csk(sk)->icsk_accept_queue.listen_opt; |
Hannes Frederic Sowa | 5ad37d5 | 2013-07-26 17:43:23 +0200 | [diff] [blame] | 893 | if (!lopt->synflood_warned && sysctl_tcp_syncookies != 2) { |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 894 | lopt->synflood_warned = 1; |
Joe Perches | afd46503 | 2012-03-12 07:03:32 +0000 | [diff] [blame] | 895 | pr_info("%s: Possible SYN flooding on port %d. %s. Check SNMP counters.\n", |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 896 | proto, ntohs(tcp_hdr(skb)->dest), msg); |
| 897 | } |
| 898 | return want_cookie; |
Florian Westphal | 2a1d4bd | 2010-06-03 00:43:12 +0000 | [diff] [blame] | 899 | } |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 900 | EXPORT_SYMBOL(tcp_syn_flood_action); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | |
| 902 | /* |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 903 | * Save and compile IPv4 options into the request_sock if needed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | */ |
Christoph Paasch | 5dff747 | 2012-09-26 11:59:09 +0000 | [diff] [blame] | 905 | static struct ip_options_rcu *tcp_v4_save_options(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | { |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 907 | const struct ip_options *opt = &(IPCB(skb)->opt); |
| 908 | struct ip_options_rcu *dopt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | |
| 910 | if (opt && opt->optlen) { |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 911 | int opt_size = sizeof(*dopt) + opt->optlen; |
| 912 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | dopt = kmalloc(opt_size, GFP_ATOMIC); |
| 914 | if (dopt) { |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 915 | if (ip_options_echo(&dopt->opt, skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | kfree(dopt); |
| 917 | dopt = NULL; |
| 918 | } |
| 919 | } |
| 920 | } |
| 921 | return dopt; |
| 922 | } |
| 923 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 924 | #ifdef CONFIG_TCP_MD5SIG |
| 925 | /* |
| 926 | * RFC2385 MD5 checksumming requires a mapping of |
| 927 | * IP address->MD5 Key. |
| 928 | * We need to maintain these in the sk structure. |
| 929 | */ |
| 930 | |
| 931 | /* Find the Key structure for an address. */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 932 | struct tcp_md5sig_key *tcp_md5_do_lookup(struct sock *sk, |
| 933 | const union tcp_md5_addr *addr, |
| 934 | int family) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 935 | { |
| 936 | struct tcp_sock *tp = tcp_sk(sk); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 937 | struct tcp_md5sig_key *key; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 938 | unsigned int size = sizeof(struct in_addr); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 939 | struct tcp_md5sig_info *md5sig; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 940 | |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 941 | /* caller either holds rcu_read_lock() or socket lock */ |
| 942 | md5sig = rcu_dereference_check(tp->md5sig_info, |
Eric Dumazet | b4fb05e | 2012-03-07 04:45:43 +0000 | [diff] [blame] | 943 | sock_owned_by_user(sk) || |
| 944 | lockdep_is_held(&sk->sk_lock.slock)); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 945 | if (!md5sig) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 946 | return NULL; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 947 | #if IS_ENABLED(CONFIG_IPV6) |
| 948 | if (family == AF_INET6) |
| 949 | size = sizeof(struct in6_addr); |
| 950 | #endif |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 951 | hlist_for_each_entry_rcu(key, &md5sig->head, node) { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 952 | if (key->family != family) |
| 953 | continue; |
| 954 | if (!memcmp(&key->addr, addr, size)) |
| 955 | return key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 956 | } |
| 957 | return NULL; |
| 958 | } |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 959 | EXPORT_SYMBOL(tcp_md5_do_lookup); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 960 | |
| 961 | struct tcp_md5sig_key *tcp_v4_md5_lookup(struct sock *sk, |
| 962 | struct sock *addr_sk) |
| 963 | { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 964 | union tcp_md5_addr *addr; |
| 965 | |
| 966 | addr = (union tcp_md5_addr *)&inet_sk(addr_sk)->inet_daddr; |
| 967 | return tcp_md5_do_lookup(sk, addr, AF_INET); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 968 | } |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 969 | EXPORT_SYMBOL(tcp_v4_md5_lookup); |
| 970 | |
Adrian Bunk | f5b99bc | 2006-11-30 17:22:29 -0800 | [diff] [blame] | 971 | static struct tcp_md5sig_key *tcp_v4_reqsk_md5_lookup(struct sock *sk, |
| 972 | struct request_sock *req) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 973 | { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 974 | union tcp_md5_addr *addr; |
| 975 | |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 976 | addr = (union tcp_md5_addr *)&inet_rsk(req)->ir_rmt_addr; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 977 | return tcp_md5_do_lookup(sk, addr, AF_INET); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 978 | } |
| 979 | |
| 980 | /* This can be called on a newly created socket, from other files */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 981 | int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr, |
| 982 | int family, const u8 *newkey, u8 newkeylen, gfp_t gfp) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 983 | { |
| 984 | /* Add Key to the list */ |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 985 | struct tcp_md5sig_key *key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 986 | struct tcp_sock *tp = tcp_sk(sk); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 987 | struct tcp_md5sig_info *md5sig; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 988 | |
Aydin Arik | c0353c7 | 2013-06-14 18:56:31 +1200 | [diff] [blame] | 989 | key = tcp_md5_do_lookup(sk, addr, family); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 990 | if (key) { |
| 991 | /* Pre-existing entry - just update that one. */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 992 | memcpy(key->key, newkey, newkeylen); |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 993 | key->keylen = newkeylen; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 994 | return 0; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 995 | } |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 996 | |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 997 | md5sig = rcu_dereference_protected(tp->md5sig_info, |
| 998 | sock_owned_by_user(sk)); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 999 | if (!md5sig) { |
| 1000 | md5sig = kmalloc(sizeof(*md5sig), gfp); |
| 1001 | if (!md5sig) |
| 1002 | return -ENOMEM; |
| 1003 | |
| 1004 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
| 1005 | INIT_HLIST_HEAD(&md5sig->head); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1006 | rcu_assign_pointer(tp->md5sig_info, md5sig); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1007 | } |
| 1008 | |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 1009 | key = sock_kmalloc(sk, sizeof(*key), gfp); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1010 | if (!key) |
| 1011 | return -ENOMEM; |
Eric Dumazet | 71cea17 | 2013-05-20 06:52:26 +0000 | [diff] [blame] | 1012 | if (!tcp_alloc_md5sig_pool()) { |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 1013 | sock_kfree_s(sk, key, sizeof(*key)); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1014 | return -ENOMEM; |
| 1015 | } |
| 1016 | |
| 1017 | memcpy(key->key, newkey, newkeylen); |
| 1018 | key->keylen = newkeylen; |
| 1019 | key->family = family; |
| 1020 | memcpy(&key->addr, addr, |
| 1021 | (family == AF_INET6) ? sizeof(struct in6_addr) : |
| 1022 | sizeof(struct in_addr)); |
| 1023 | hlist_add_head_rcu(&key->node, &md5sig->head); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1024 | return 0; |
| 1025 | } |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1026 | EXPORT_SYMBOL(tcp_md5_do_add); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1027 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1028 | 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] | 1029 | { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1030 | struct tcp_md5sig_key *key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1031 | |
Aydin Arik | c0353c7 | 2013-06-14 18:56:31 +1200 | [diff] [blame] | 1032 | key = tcp_md5_do_lookup(sk, addr, family); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1033 | if (!key) |
| 1034 | return -ENOENT; |
| 1035 | hlist_del_rcu(&key->node); |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 1036 | atomic_sub(sizeof(*key), &sk->sk_omem_alloc); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1037 | kfree_rcu(key, rcu); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1038 | return 0; |
| 1039 | } |
| 1040 | EXPORT_SYMBOL(tcp_md5_do_del); |
| 1041 | |
stephen hemminger | e0683e70 | 2012-10-26 14:31:40 +0000 | [diff] [blame] | 1042 | static void tcp_clear_md5_list(struct sock *sk) |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1043 | { |
| 1044 | struct tcp_sock *tp = tcp_sk(sk); |
| 1045 | struct tcp_md5sig_key *key; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1046 | struct hlist_node *n; |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1047 | struct tcp_md5sig_info *md5sig; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1048 | |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1049 | md5sig = rcu_dereference_protected(tp->md5sig_info, 1); |
| 1050 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1051 | hlist_for_each_entry_safe(key, n, &md5sig->head, node) { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1052 | hlist_del_rcu(&key->node); |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 1053 | atomic_sub(sizeof(*key), &sk->sk_omem_alloc); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1054 | kfree_rcu(key, rcu); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1055 | } |
| 1056 | } |
| 1057 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1058 | static int tcp_v4_parse_md5_keys(struct sock *sk, char __user *optval, |
| 1059 | int optlen) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1060 | { |
| 1061 | struct tcp_md5sig cmd; |
| 1062 | struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1063 | |
| 1064 | if (optlen < sizeof(cmd)) |
| 1065 | return -EINVAL; |
| 1066 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1067 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1068 | return -EFAULT; |
| 1069 | |
| 1070 | if (sin->sin_family != AF_INET) |
| 1071 | return -EINVAL; |
| 1072 | |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1073 | if (!cmd.tcpm_key || !cmd.tcpm_keylen) |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1074 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr, |
| 1075 | AF_INET); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1076 | |
| 1077 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) |
| 1078 | return -EINVAL; |
| 1079 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1080 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr, |
| 1081 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, |
| 1082 | GFP_KERNEL); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1083 | } |
| 1084 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1085 | static int tcp_v4_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
| 1086 | __be32 daddr, __be32 saddr, int nbytes) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1087 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1088 | struct tcp4_pseudohdr *bp; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1089 | struct scatterlist sg; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1090 | |
| 1091 | bp = &hp->md5_blk.ip4; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1092 | |
| 1093 | /* |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1094 | * 1. the TCP pseudo-header (in the order: source IP address, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1095 | * destination IP address, zero-padded protocol number, and |
| 1096 | * segment length) |
| 1097 | */ |
| 1098 | bp->saddr = saddr; |
| 1099 | bp->daddr = daddr; |
| 1100 | bp->pad = 0; |
YOSHIFUJI Hideaki | 076fb72 | 2008-04-17 12:48:12 +0900 | [diff] [blame] | 1101 | bp->protocol = IPPROTO_TCP; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1102 | bp->len = cpu_to_be16(nbytes); |
David S. Miller | c7da57a | 2007-10-26 00:41:21 -0700 | [diff] [blame] | 1103 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1104 | sg_init_one(&sg, bp, sizeof(*bp)); |
| 1105 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); |
| 1106 | } |
| 1107 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1108 | 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] | 1109 | __be32 daddr, __be32 saddr, const struct tcphdr *th) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1110 | { |
| 1111 | struct tcp_md5sig_pool *hp; |
| 1112 | struct hash_desc *desc; |
| 1113 | |
| 1114 | hp = tcp_get_md5sig_pool(); |
| 1115 | if (!hp) |
| 1116 | goto clear_hash_noput; |
| 1117 | desc = &hp->md5_desc; |
| 1118 | |
| 1119 | if (crypto_hash_init(desc)) |
| 1120 | goto clear_hash; |
| 1121 | if (tcp_v4_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) |
| 1122 | goto clear_hash; |
| 1123 | if (tcp_md5_hash_header(hp, th)) |
| 1124 | goto clear_hash; |
| 1125 | if (tcp_md5_hash_key(hp, key)) |
| 1126 | goto clear_hash; |
| 1127 | if (crypto_hash_final(desc, md5_hash)) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1128 | goto clear_hash; |
| 1129 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1130 | tcp_put_md5sig_pool(); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1131 | return 0; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1132 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1133 | clear_hash: |
| 1134 | tcp_put_md5sig_pool(); |
| 1135 | clear_hash_noput: |
| 1136 | memset(md5_hash, 0, 16); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1137 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1138 | } |
| 1139 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1140 | int tcp_v4_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 1141 | const struct sock *sk, const struct request_sock *req, |
| 1142 | const struct sk_buff *skb) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1143 | { |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1144 | struct tcp_md5sig_pool *hp; |
| 1145 | struct hash_desc *desc; |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 1146 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1147 | __be32 saddr, daddr; |
| 1148 | |
| 1149 | if (sk) { |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1150 | saddr = inet_sk(sk)->inet_saddr; |
| 1151 | daddr = inet_sk(sk)->inet_daddr; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1152 | } else if (req) { |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 1153 | saddr = inet_rsk(req)->ir_loc_addr; |
| 1154 | daddr = inet_rsk(req)->ir_rmt_addr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1155 | } else { |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1156 | const struct iphdr *iph = ip_hdr(skb); |
| 1157 | saddr = iph->saddr; |
| 1158 | daddr = iph->daddr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1159 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1160 | |
| 1161 | hp = tcp_get_md5sig_pool(); |
| 1162 | if (!hp) |
| 1163 | goto clear_hash_noput; |
| 1164 | desc = &hp->md5_desc; |
| 1165 | |
| 1166 | if (crypto_hash_init(desc)) |
| 1167 | goto clear_hash; |
| 1168 | |
| 1169 | if (tcp_v4_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) |
| 1170 | goto clear_hash; |
| 1171 | if (tcp_md5_hash_header(hp, th)) |
| 1172 | goto clear_hash; |
| 1173 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) |
| 1174 | goto clear_hash; |
| 1175 | if (tcp_md5_hash_key(hp, key)) |
| 1176 | goto clear_hash; |
| 1177 | if (crypto_hash_final(desc, md5_hash)) |
| 1178 | goto clear_hash; |
| 1179 | |
| 1180 | tcp_put_md5sig_pool(); |
| 1181 | return 0; |
| 1182 | |
| 1183 | clear_hash: |
| 1184 | tcp_put_md5sig_pool(); |
| 1185 | clear_hash_noput: |
| 1186 | memset(md5_hash, 0, 16); |
| 1187 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1188 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1189 | EXPORT_SYMBOL(tcp_v4_md5_hash_skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1190 | |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1191 | static bool tcp_v4_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1192 | { |
| 1193 | /* |
| 1194 | * This gets called for each TCP segment that arrives |
| 1195 | * so we want to be efficient. |
| 1196 | * We have 3 drop cases: |
| 1197 | * o No MD5 hash and one expected. |
| 1198 | * o MD5 hash and we're not expecting one. |
| 1199 | * o MD5 hash and its wrong. |
| 1200 | */ |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1201 | const __u8 *hash_location = NULL; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1202 | struct tcp_md5sig_key *hash_expected; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1203 | const struct iphdr *iph = ip_hdr(skb); |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1204 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1205 | int genhash; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1206 | unsigned char newhash[16]; |
| 1207 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1208 | hash_expected = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&iph->saddr, |
| 1209 | AF_INET); |
YOSHIFUJI Hideaki | 7d5d552 | 2008-04-17 12:29:53 +0900 | [diff] [blame] | 1210 | hash_location = tcp_parse_md5sig_option(th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1211 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1212 | /* We've parsed the options - do we have a hash? */ |
| 1213 | if (!hash_expected && !hash_location) |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1214 | return false; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1215 | |
| 1216 | if (hash_expected && !hash_location) { |
David S. Miller | 785957d | 2008-07-30 03:03:15 -0700 | [diff] [blame] | 1217 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1218 | return true; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1219 | } |
| 1220 | |
| 1221 | if (!hash_expected && hash_location) { |
David S. Miller | 785957d | 2008-07-30 03:03:15 -0700 | [diff] [blame] | 1222 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1223 | return true; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1224 | } |
| 1225 | |
| 1226 | /* Okay, so this is hash_expected and hash_location - |
| 1227 | * so we need to calculate the checksum. |
| 1228 | */ |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1229 | genhash = tcp_v4_md5_hash_skb(newhash, |
| 1230 | hash_expected, |
| 1231 | NULL, NULL, skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1232 | |
| 1233 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1234 | net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s\n", |
| 1235 | &iph->saddr, ntohs(th->source), |
| 1236 | &iph->daddr, ntohs(th->dest), |
| 1237 | genhash ? " tcp_v4_calc_md5_hash failed" |
| 1238 | : ""); |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1239 | return true; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1240 | } |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1241 | return false; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1242 | } |
| 1243 | |
| 1244 | #endif |
| 1245 | |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 1246 | struct request_sock_ops tcp_request_sock_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | .family = PF_INET, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1248 | .obj_size = sizeof(struct tcp_request_sock), |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 1249 | .rtx_syn_ack = tcp_v4_rtx_synack, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1250 | .send_ack = tcp_v4_reqsk_send_ack, |
| 1251 | .destructor = tcp_v4_reqsk_destructor, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | .send_reset = tcp_v4_send_reset, |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 1253 | .syn_ack_timeout = tcp_syn_ack_timeout, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | }; |
| 1255 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1256 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 1257 | static const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1258 | .md5_lookup = tcp_v4_reqsk_md5_lookup, |
John Dykstra | e3afe7b | 2009-07-16 05:04:51 +0000 | [diff] [blame] | 1259 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1260 | }; |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 1261 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1262 | |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1263 | static bool tcp_fastopen_check(struct sock *sk, struct sk_buff *skb, |
| 1264 | struct request_sock *req, |
| 1265 | struct tcp_fastopen_cookie *foc, |
| 1266 | struct tcp_fastopen_cookie *valid_foc) |
| 1267 | { |
| 1268 | bool skip_cookie = false; |
| 1269 | struct fastopen_queue *fastopenq; |
| 1270 | |
| 1271 | if (likely(!fastopen_cookie_present(foc))) { |
| 1272 | /* See include/net/tcp.h for the meaning of these knobs */ |
| 1273 | if ((sysctl_tcp_fastopen & TFO_SERVER_ALWAYS) || |
| 1274 | ((sysctl_tcp_fastopen & TFO_SERVER_COOKIE_NOT_REQD) && |
| 1275 | (TCP_SKB_CB(skb)->end_seq != TCP_SKB_CB(skb)->seq + 1))) |
| 1276 | skip_cookie = true; /* no cookie to validate */ |
| 1277 | else |
| 1278 | return false; |
| 1279 | } |
| 1280 | fastopenq = inet_csk(sk)->icsk_accept_queue.fastopenq; |
| 1281 | /* A FO option is present; bump the counter. */ |
| 1282 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPFASTOPENPASSIVE); |
| 1283 | |
| 1284 | /* Make sure the listener has enabled fastopen, and we don't |
| 1285 | * exceed the max # of pending TFO requests allowed before trying |
| 1286 | * to validating the cookie in order to avoid burning CPU cycles |
| 1287 | * unnecessarily. |
| 1288 | * |
| 1289 | * XXX (TFO) - The implication of checking the max_qlen before |
| 1290 | * processing a cookie request is that clients can't differentiate |
| 1291 | * between qlen overflow causing Fast Open to be disabled |
| 1292 | * temporarily vs a server not supporting Fast Open at all. |
| 1293 | */ |
| 1294 | if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) == 0 || |
| 1295 | fastopenq == NULL || fastopenq->max_qlen == 0) |
| 1296 | return false; |
| 1297 | |
| 1298 | if (fastopenq->qlen >= fastopenq->max_qlen) { |
| 1299 | struct request_sock *req1; |
| 1300 | spin_lock(&fastopenq->lock); |
| 1301 | req1 = fastopenq->rskq_rst_head; |
| 1302 | if ((req1 == NULL) || time_after(req1->expires, jiffies)) { |
| 1303 | spin_unlock(&fastopenq->lock); |
| 1304 | NET_INC_STATS_BH(sock_net(sk), |
| 1305 | LINUX_MIB_TCPFASTOPENLISTENOVERFLOW); |
| 1306 | /* Avoid bumping LINUX_MIB_TCPFASTOPENPASSIVEFAIL*/ |
| 1307 | foc->len = -1; |
| 1308 | return false; |
| 1309 | } |
| 1310 | fastopenq->rskq_rst_head = req1->dl_next; |
| 1311 | fastopenq->qlen--; |
| 1312 | spin_unlock(&fastopenq->lock); |
| 1313 | reqsk_free(req1); |
| 1314 | } |
| 1315 | if (skip_cookie) { |
| 1316 | tcp_rsk(req)->rcv_nxt = TCP_SKB_CB(skb)->end_seq; |
| 1317 | return true; |
| 1318 | } |
Yuchung Cheng | 149479d | 2013-08-08 14:06:22 -0700 | [diff] [blame] | 1319 | |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1320 | if (foc->len == TCP_FASTOPEN_COOKIE_SIZE) { |
| 1321 | if ((sysctl_tcp_fastopen & TFO_SERVER_COOKIE_NOT_CHKED) == 0) { |
Yuchung Cheng | 149479d | 2013-08-08 14:06:22 -0700 | [diff] [blame] | 1322 | tcp_fastopen_cookie_gen(ip_hdr(skb)->saddr, |
| 1323 | ip_hdr(skb)->daddr, valid_foc); |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1324 | if ((valid_foc->len != TCP_FASTOPEN_COOKIE_SIZE) || |
| 1325 | memcmp(&foc->val[0], &valid_foc->val[0], |
| 1326 | TCP_FASTOPEN_COOKIE_SIZE) != 0) |
| 1327 | return false; |
| 1328 | valid_foc->len = -1; |
| 1329 | } |
| 1330 | /* Acknowledge the data received from the peer. */ |
| 1331 | tcp_rsk(req)->rcv_nxt = TCP_SKB_CB(skb)->end_seq; |
| 1332 | return true; |
| 1333 | } else if (foc->len == 0) { /* Client requesting a cookie */ |
Yuchung Cheng | 149479d | 2013-08-08 14:06:22 -0700 | [diff] [blame] | 1334 | tcp_fastopen_cookie_gen(ip_hdr(skb)->saddr, |
| 1335 | ip_hdr(skb)->daddr, valid_foc); |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1336 | NET_INC_STATS_BH(sock_net(sk), |
| 1337 | LINUX_MIB_TCPFASTOPENCOOKIEREQD); |
| 1338 | } else { |
| 1339 | /* Client sent a cookie with wrong size. Treat it |
| 1340 | * the same as invalid and return a valid one. |
| 1341 | */ |
Yuchung Cheng | 149479d | 2013-08-08 14:06:22 -0700 | [diff] [blame] | 1342 | tcp_fastopen_cookie_gen(ip_hdr(skb)->saddr, |
| 1343 | ip_hdr(skb)->daddr, valid_foc); |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1344 | } |
| 1345 | return false; |
| 1346 | } |
| 1347 | |
| 1348 | static int tcp_v4_conn_req_fastopen(struct sock *sk, |
| 1349 | struct sk_buff *skb, |
| 1350 | struct sk_buff *skb_synack, |
Christoph Paasch | 1a2c618 | 2013-03-17 08:23:34 +0000 | [diff] [blame] | 1351 | struct request_sock *req) |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1352 | { |
| 1353 | struct tcp_sock *tp = tcp_sk(sk); |
| 1354 | struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue; |
| 1355 | const struct inet_request_sock *ireq = inet_rsk(req); |
| 1356 | struct sock *child; |
Neal Cardwell | 016818d | 2012-09-22 04:18:55 +0000 | [diff] [blame] | 1357 | int err; |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1358 | |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 1359 | req->num_retrans = 0; |
| 1360 | req->num_timeout = 0; |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1361 | req->sk = NULL; |
| 1362 | |
| 1363 | child = inet_csk(sk)->icsk_af_ops->syn_recv_sock(sk, skb, req, NULL); |
| 1364 | if (child == NULL) { |
| 1365 | NET_INC_STATS_BH(sock_net(sk), |
| 1366 | LINUX_MIB_TCPFASTOPENPASSIVEFAIL); |
| 1367 | kfree_skb(skb_synack); |
| 1368 | return -1; |
| 1369 | } |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 1370 | err = ip_build_and_send_pkt(skb_synack, sk, ireq->ir_loc_addr, |
| 1371 | ireq->ir_rmt_addr, ireq->opt); |
Neal Cardwell | 016818d | 2012-09-22 04:18:55 +0000 | [diff] [blame] | 1372 | err = net_xmit_eval(err); |
| 1373 | if (!err) |
| 1374 | tcp_rsk(req)->snt_synack = tcp_time_stamp; |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1375 | /* XXX (TFO) - is it ok to ignore error and continue? */ |
| 1376 | |
| 1377 | spin_lock(&queue->fastopenq->lock); |
| 1378 | queue->fastopenq->qlen++; |
| 1379 | spin_unlock(&queue->fastopenq->lock); |
| 1380 | |
| 1381 | /* Initialize the child socket. Have to fix some values to take |
| 1382 | * into account the child is a Fast Open socket and is created |
| 1383 | * only out of the bits carried in the SYN packet. |
| 1384 | */ |
| 1385 | tp = tcp_sk(child); |
| 1386 | |
| 1387 | tp->fastopen_rsk = req; |
| 1388 | /* Do a hold on the listner sk so that if the listener is being |
| 1389 | * closed, the child that has been accepted can live on and still |
| 1390 | * access listen_lock. |
| 1391 | */ |
| 1392 | sock_hold(sk); |
| 1393 | tcp_rsk(req)->listener = sk; |
| 1394 | |
| 1395 | /* RFC1323: The window in SYN & SYN/ACK segments is never |
| 1396 | * scaled. So correct it appropriately. |
| 1397 | */ |
| 1398 | tp->snd_wnd = ntohs(tcp_hdr(skb)->window); |
| 1399 | |
| 1400 | /* Activate the retrans timer so that SYNACK can be retransmitted. |
| 1401 | * The request socket is not added to the SYN table of the parent |
| 1402 | * because it's been added to the accept queue directly. |
| 1403 | */ |
| 1404 | inet_csk_reset_xmit_timer(child, ICSK_TIME_RETRANS, |
| 1405 | TCP_TIMEOUT_INIT, TCP_RTO_MAX); |
| 1406 | |
| 1407 | /* Add the child socket directly into the accept queue */ |
| 1408 | inet_csk_reqsk_queue_add(sk, req, child); |
| 1409 | |
| 1410 | /* Now finish processing the fastopen child socket. */ |
| 1411 | inet_csk(child)->icsk_af_ops->rebuild_header(child); |
| 1412 | tcp_init_congestion_control(child); |
| 1413 | tcp_mtup_init(child); |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1414 | tcp_init_metrics(child); |
Eric Dumazet | 6ae7053 | 2013-10-01 10:23:44 -0700 | [diff] [blame] | 1415 | tcp_init_buffer_space(child); |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1416 | |
| 1417 | /* Queue the data carried in the SYN packet. We need to first |
| 1418 | * bump skb's refcnt because the caller will attempt to free it. |
| 1419 | * |
| 1420 | * XXX (TFO) - we honor a zero-payload TFO request for now. |
| 1421 | * (Any reason not to?) |
| 1422 | */ |
| 1423 | if (TCP_SKB_CB(skb)->end_seq == TCP_SKB_CB(skb)->seq + 1) { |
| 1424 | /* Don't queue the skb if there is no payload in SYN. |
| 1425 | * XXX (TFO) - How about SYN+FIN? |
| 1426 | */ |
| 1427 | tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq; |
| 1428 | } else { |
| 1429 | skb = skb_get(skb); |
| 1430 | skb_dst_drop(skb); |
| 1431 | __skb_pull(skb, tcp_hdr(skb)->doff * 4); |
| 1432 | skb_set_owner_r(skb, child); |
| 1433 | __skb_queue_tail(&child->sk_receive_queue, skb); |
| 1434 | tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq; |
Yuchung Cheng | 6f73601 | 2012-10-19 15:14:44 +0000 | [diff] [blame] | 1435 | tp->syn_data_acked = 1; |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1436 | } |
| 1437 | sk->sk_data_ready(sk, 0); |
| 1438 | bh_unlock_sock(child); |
| 1439 | sock_put(child); |
| 1440 | WARN_ON(req->sk == NULL); |
| 1441 | return 0; |
| 1442 | } |
| 1443 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) |
| 1445 | { |
| 1446 | struct tcp_options_received tmp_opt; |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1447 | struct request_sock *req; |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1448 | struct inet_request_sock *ireq; |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1449 | struct tcp_sock *tp = tcp_sk(sk); |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1450 | struct dst_entry *dst = NULL; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1451 | __be32 saddr = ip_hdr(skb)->saddr; |
| 1452 | __be32 daddr = ip_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | __u32 isn = TCP_SKB_CB(skb)->when; |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1454 | bool want_cookie = false; |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1455 | struct flowi4 fl4; |
| 1456 | struct tcp_fastopen_cookie foc = { .len = -1 }; |
| 1457 | struct tcp_fastopen_cookie valid_foc = { .len = -1 }; |
| 1458 | struct sk_buff *skb_synack; |
| 1459 | int do_fastopen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | |
| 1461 | /* Never answer to SYNs send to broadcast or multicast */ |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 1462 | if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | goto drop; |
| 1464 | |
| 1465 | /* TW buckets are converted to open requests without |
| 1466 | * limitations, they conserve resources and peer is |
| 1467 | * evidently real one. |
| 1468 | */ |
Hannes Frederic Sowa | 5ad37d5 | 2013-07-26 17:43:23 +0200 | [diff] [blame] | 1469 | if ((sysctl_tcp_syncookies == 2 || |
| 1470 | inet_csk_reqsk_queue_is_full(sk)) && !isn) { |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 1471 | want_cookie = tcp_syn_flood_action(sk, skb, "TCP"); |
| 1472 | if (!want_cookie) |
| 1473 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | } |
| 1475 | |
| 1476 | /* Accept backlog is full. If we have already queued enough |
| 1477 | * of warm entries in syn queue, drop request. It is better than |
| 1478 | * clogging syn queue with openreqs with exponentially increasing |
| 1479 | * timeout. |
| 1480 | */ |
Nivedita Singhvi | 2aeef18 | 2013-01-28 17:52:37 +0000 | [diff] [blame] | 1481 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) { |
| 1482 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | goto drop; |
Nivedita Singhvi | 2aeef18 | 2013-01-28 17:52:37 +0000 | [diff] [blame] | 1484 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | |
Arnaldo Carvalho de Melo | ce4a7d0 | 2008-06-10 12:39:35 -0700 | [diff] [blame] | 1486 | req = inet_reqsk_alloc(&tcp_request_sock_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | if (!req) |
| 1488 | goto drop; |
| 1489 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1490 | #ifdef CONFIG_TCP_MD5SIG |
| 1491 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv4_ops; |
| 1492 | #endif |
| 1493 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | tcp_clear_options(&tmp_opt); |
William Allen Simpson | bee7ca9 | 2009-11-10 09:51:18 +0000 | [diff] [blame] | 1495 | tmp_opt.mss_clamp = TCP_MSS_DEFAULT; |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1496 | tmp_opt.user_mss = tp->rx_opt.user_mss; |
Christoph Paasch | 1a2c618 | 2013-03-17 08:23:34 +0000 | [diff] [blame] | 1497 | tcp_parse_options(skb, &tmp_opt, 0, want_cookie ? NULL : &foc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | |
Florian Westphal | 4dfc281 | 2008-04-10 03:12:40 -0700 | [diff] [blame] | 1499 | if (want_cookie && !tmp_opt.saw_tstamp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | tcp_clear_options(&tmp_opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | tcp_openreq_init(req, &tmp_opt, skb); |
| 1504 | |
David S. Miller | bb5b7c1 | 2009-12-15 20:56:42 -0800 | [diff] [blame] | 1505 | ireq = inet_rsk(req); |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 1506 | ireq->ir_loc_addr = daddr; |
| 1507 | ireq->ir_rmt_addr = saddr; |
David S. Miller | bb5b7c1 | 2009-12-15 20:56:42 -0800 | [diff] [blame] | 1508 | ireq->no_srccheck = inet_sk(sk)->transparent; |
Christoph Paasch | 5dff747 | 2012-09-26 11:59:09 +0000 | [diff] [blame] | 1509 | ireq->opt = tcp_v4_save_options(skb); |
David S. Miller | bb5b7c1 | 2009-12-15 20:56:42 -0800 | [diff] [blame] | 1510 | |
Paul Moore | 284904a | 2009-03-27 17:10:28 -0400 | [diff] [blame] | 1511 | if (security_inet_conn_request(sk, skb, req)) |
David S. Miller | bb5b7c1 | 2009-12-15 20:56:42 -0800 | [diff] [blame] | 1512 | goto drop_and_free; |
Paul Moore | 284904a | 2009-03-27 17:10:28 -0400 | [diff] [blame] | 1513 | |
Florian Westphal | 172d69e | 2010-06-21 11:48:45 +0000 | [diff] [blame] | 1514 | if (!want_cookie || tmp_opt.tstamp_ok) |
Hannes Frederic Sowa | 5d134f1 | 2013-01-05 16:10:48 +0000 | [diff] [blame] | 1515 | TCP_ECN_create_request(req, skb, sock_net(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | |
| 1517 | if (want_cookie) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1518 | isn = cookie_v4_init_sequence(sk, skb, &req->mss); |
Florian Westphal | 172d69e | 2010-06-21 11:48:45 +0000 | [diff] [blame] | 1519 | req->cookie_ts = tmp_opt.tstamp_ok; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | } else if (!isn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | /* VJ's idea. We save last timestamp seen |
| 1522 | * from the destination in peer table, when entering |
| 1523 | * state TIME-WAIT, and check against it before |
| 1524 | * accepting new connection request. |
| 1525 | * |
| 1526 | * If "isn" is not zero, this request hit alive |
| 1527 | * timewait bucket, so that all the necessary checks |
| 1528 | * are made in the function processing timewait state. |
| 1529 | */ |
| 1530 | if (tmp_opt.saw_tstamp && |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 1531 | tcp_death_row.sysctl_tw_recycle && |
David S. Miller | ba3f7f0 | 2012-07-17 14:02:46 -0700 | [diff] [blame] | 1532 | (dst = inet_csk_route_req(sk, &fl4, req)) != NULL && |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 1533 | fl4.daddr == saddr) { |
| 1534 | if (!tcp_peer_is_proven(req, dst, true)) { |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 1535 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); |
Denis V. Lunev | 7cd04fa | 2008-03-03 11:59:32 -0800 | [diff] [blame] | 1536 | goto drop_and_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | } |
| 1538 | } |
| 1539 | /* Kill the following clause, if you dislike this way. */ |
| 1540 | else if (!sysctl_tcp_syncookies && |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1541 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | (sysctl_max_syn_backlog >> 2)) && |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 1543 | !tcp_peer_is_proven(req, dst, false)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1544 | /* Without syncookies last quarter of |
| 1545 | * backlog is filled with destinations, |
| 1546 | * proven to be alive. |
| 1547 | * It means that we continue to communicate |
| 1548 | * to destinations, already remembered |
| 1549 | * to the moment of synflood. |
| 1550 | */ |
Joe Perches | afd46503 | 2012-03-12 07:03:32 +0000 | [diff] [blame] | 1551 | LIMIT_NETDEBUG(KERN_DEBUG pr_fmt("drop open request from %pI4/%u\n"), |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1552 | &saddr, ntohs(tcp_hdr(skb)->source)); |
Denis V. Lunev | 7cd04fa | 2008-03-03 11:59:32 -0800 | [diff] [blame] | 1553 | goto drop_and_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | } |
| 1555 | |
Gerrit Renker | a94f723 | 2006-11-10 14:06:49 -0800 | [diff] [blame] | 1556 | isn = tcp_v4_init_sequence(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | } |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1558 | tcp_rsk(req)->snt_isn = isn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1560 | if (dst == NULL) { |
| 1561 | dst = inet_csk_route_req(sk, &fl4, req); |
| 1562 | if (dst == NULL) |
| 1563 | goto drop_and_free; |
| 1564 | } |
| 1565 | do_fastopen = tcp_fastopen_check(sk, skb, req, &foc, &valid_foc); |
| 1566 | |
| 1567 | /* We don't call tcp_v4_send_synack() directly because we need |
| 1568 | * to make sure a child socket can be created successfully before |
| 1569 | * sending back synack! |
| 1570 | * |
| 1571 | * XXX (TFO) - Ideally one would simply call tcp_v4_send_synack() |
| 1572 | * (or better yet, call tcp_send_synack() in the child context |
| 1573 | * directly, but will have to fix bunch of other code first) |
| 1574 | * after syn_recv_sock() except one will need to first fix the |
| 1575 | * latter to remove its dependency on the current implementation |
| 1576 | * of tcp_v4_send_synack()->tcp_select_initial_window(). |
| 1577 | */ |
| 1578 | skb_synack = tcp_make_synack(sk, dst, req, |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1579 | fastopen_cookie_present(&valid_foc) ? &valid_foc : NULL); |
| 1580 | |
| 1581 | if (skb_synack) { |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 1582 | __tcp_v4_send_check(skb_synack, ireq->ir_loc_addr, ireq->ir_rmt_addr); |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1583 | skb_set_queue_mapping(skb_synack, skb_get_queue_mapping(skb)); |
| 1584 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | goto drop_and_free; |
| 1586 | |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1587 | if (likely(!do_fastopen)) { |
| 1588 | int err; |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 1589 | err = ip_build_and_send_pkt(skb_synack, sk, ireq->ir_loc_addr, |
| 1590 | ireq->ir_rmt_addr, ireq->opt); |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1591 | err = net_xmit_eval(err); |
| 1592 | if (err || want_cookie) |
| 1593 | goto drop_and_free; |
| 1594 | |
Neal Cardwell | 016818d | 2012-09-22 04:18:55 +0000 | [diff] [blame] | 1595 | tcp_rsk(req)->snt_synack = tcp_time_stamp; |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1596 | tcp_rsk(req)->listener = NULL; |
| 1597 | /* Add the request_sock to the SYN table */ |
| 1598 | inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
| 1599 | if (fastopen_cookie_present(&foc) && foc.len != 0) |
| 1600 | NET_INC_STATS_BH(sock_net(sk), |
| 1601 | LINUX_MIB_TCPFASTOPENPASSIVEFAIL); |
Christoph Paasch | 1a2c618 | 2013-03-17 08:23:34 +0000 | [diff] [blame] | 1602 | } else if (tcp_v4_conn_req_fastopen(sk, skb, skb_synack, req)) |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1603 | goto drop_and_free; |
| 1604 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | return 0; |
| 1606 | |
Denis V. Lunev | 7cd04fa | 2008-03-03 11:59:32 -0800 | [diff] [blame] | 1607 | drop_and_release: |
| 1608 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | drop_and_free: |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1610 | reqsk_free(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | drop: |
Vijay Subramanian | 848bf15 | 2013-01-31 08:24:06 +0000 | [diff] [blame] | 1612 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | return 0; |
| 1614 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1615 | EXPORT_SYMBOL(tcp_v4_conn_request); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | |
| 1617 | |
| 1618 | /* |
| 1619 | * The three way handshake has completed - we got a valid synack - |
| 1620 | * now create the new socket. |
| 1621 | */ |
| 1622 | struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1623 | struct request_sock *req, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | struct dst_entry *dst) |
| 1625 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1626 | struct inet_request_sock *ireq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | struct inet_sock *newinet; |
| 1628 | struct tcp_sock *newtp; |
| 1629 | struct sock *newsk; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1630 | #ifdef CONFIG_TCP_MD5SIG |
| 1631 | struct tcp_md5sig_key *key; |
| 1632 | #endif |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1633 | struct ip_options_rcu *inet_opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | |
| 1635 | if (sk_acceptq_is_full(sk)) |
| 1636 | goto exit_overflow; |
| 1637 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | newsk = tcp_create_openreq_child(sk, req, skb); |
| 1639 | if (!newsk) |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1640 | goto exit_nonewsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 1642 | newsk->sk_gso_type = SKB_GSO_TCPV4; |
Neal Cardwell | fae6ef8 | 2012-08-19 03:30:38 +0000 | [diff] [blame] | 1643 | inet_sk_rx_dst_set(newsk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | |
| 1645 | newtp = tcp_sk(newsk); |
| 1646 | newinet = inet_sk(newsk); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1647 | ireq = inet_rsk(req); |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 1648 | newinet->inet_daddr = ireq->ir_rmt_addr; |
| 1649 | newinet->inet_rcv_saddr = ireq->ir_loc_addr; |
| 1650 | newinet->inet_saddr = ireq->ir_loc_addr; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1651 | inet_opt = ireq->opt; |
| 1652 | rcu_assign_pointer(newinet->inet_opt, inet_opt); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1653 | ireq->opt = NULL; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1654 | newinet->mc_index = inet_iif(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1655 | newinet->mc_ttl = ip_hdr(skb)->ttl; |
Jiri Benc | 4c507d2 | 2012-02-09 09:35:49 +0000 | [diff] [blame] | 1656 | newinet->rcv_tos = ip_hdr(skb)->tos; |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1657 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1658 | if (inet_opt) |
| 1659 | inet_csk(newsk)->icsk_ext_hdr_len = inet_opt->opt.optlen; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1660 | newinet->inet_id = newtp->write_seq ^ jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1661 | |
Eric Dumazet | dfd25ff | 2012-03-10 09:20:21 +0000 | [diff] [blame] | 1662 | if (!dst) { |
| 1663 | dst = inet_csk_route_child_sock(sk, newsk, req); |
| 1664 | if (!dst) |
| 1665 | goto put_and_exit; |
| 1666 | } else { |
| 1667 | /* syncookie case : see end of cookie_v4_check() */ |
| 1668 | } |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1669 | sk_setup_caps(newsk, dst); |
| 1670 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | tcp_sync_mss(newsk, dst_mtu(dst)); |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 1672 | newtp->advmss = dst_metric_advmss(dst); |
Tom Quetchenbach | f5fff5d | 2008-09-21 00:21:51 -0700 | [diff] [blame] | 1673 | if (tcp_sk(sk)->rx_opt.user_mss && |
| 1674 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) |
| 1675 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; |
| 1676 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | tcp_initialize_rcv_mss(newsk); |
| 1678 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1679 | #ifdef CONFIG_TCP_MD5SIG |
| 1680 | /* Copy over the MD5 key from the original socket */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1681 | key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&newinet->inet_daddr, |
| 1682 | AF_INET); |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1683 | if (key != NULL) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1684 | /* |
| 1685 | * We're using one, so create a matching key |
| 1686 | * on the newsk structure. If we fail to get |
| 1687 | * memory, then we end up not copying the key |
| 1688 | * across. Shucks. |
| 1689 | */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1690 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newinet->inet_daddr, |
| 1691 | AF_INET, key->key, key->keylen, GFP_ATOMIC); |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 1692 | sk_nocaps_add(newsk, NETIF_F_GSO_MASK); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1693 | } |
| 1694 | #endif |
| 1695 | |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1696 | if (__inet_inherit_port(sk, newsk) < 0) |
| 1697 | goto put_and_exit; |
Eric Dumazet | 9327f70 | 2009-12-04 03:46:54 +0000 | [diff] [blame] | 1698 | __inet_hash_nolisten(newsk, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | |
| 1700 | return newsk; |
| 1701 | |
| 1702 | exit_overflow: |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 1703 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1704 | exit_nonewsk: |
| 1705 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | exit: |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 1707 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | return NULL; |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1709 | put_and_exit: |
Christoph Paasch | e337e24 | 2012-12-14 04:07:58 +0000 | [diff] [blame] | 1710 | inet_csk_prepare_forced_close(newsk); |
| 1711 | tcp_done(newsk); |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1712 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1714 | EXPORT_SYMBOL(tcp_v4_syn_recv_sock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | |
| 1716 | static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) |
| 1717 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1718 | struct tcphdr *th = tcp_hdr(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1719 | const struct iphdr *iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | struct sock *nsk; |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1721 | struct request_sock **prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | /* Find possible connection requests. */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1723 | struct request_sock *req = inet_csk_search_req(sk, &prev, th->source, |
| 1724 | iph->saddr, iph->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | if (req) |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 1726 | return tcp_check_req(sk, skb, req, prev, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1728 | nsk = inet_lookup_established(sock_net(sk), &tcp_hashinfo, iph->saddr, |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 1729 | th->source, iph->daddr, th->dest, inet_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | |
| 1731 | if (nsk) { |
| 1732 | if (nsk->sk_state != TCP_TIME_WAIT) { |
| 1733 | bh_lock_sock(nsk); |
| 1734 | return nsk; |
| 1735 | } |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1736 | inet_twsk_put(inet_twsk(nsk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1737 | return NULL; |
| 1738 | } |
| 1739 | |
| 1740 | #ifdef CONFIG_SYN_COOKIES |
Florian Westphal | af9b473 | 2010-06-03 00:43:44 +0000 | [diff] [blame] | 1741 | if (!th->syn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | sk = cookie_v4_check(sk, skb, &(IPCB(skb)->opt)); |
| 1743 | #endif |
| 1744 | return sk; |
| 1745 | } |
| 1746 | |
Al Viro | b51655b | 2006-11-14 21:40:42 -0800 | [diff] [blame] | 1747 | static __sum16 tcp_v4_checksum_init(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1749 | const struct iphdr *iph = ip_hdr(skb); |
| 1750 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1751 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1752 | if (!tcp_v4_check(skb->len, iph->saddr, |
| 1753 | iph->daddr, skb->csum)) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1754 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | return 0; |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1756 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | } |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1758 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1759 | skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1760 | skb->len, IPPROTO_TCP, 0); |
| 1761 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | if (skb->len <= 76) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1763 | return __skb_checksum_complete(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | } |
| 1765 | return 0; |
| 1766 | } |
| 1767 | |
| 1768 | |
| 1769 | /* The socket must have it's spinlock held when we get |
| 1770 | * here. |
| 1771 | * |
| 1772 | * We have a potential double-lock case here, so even when |
| 1773 | * doing backlog processing we use the BH locking scheme. |
| 1774 | * This is because we cannot sleep with the original spinlock |
| 1775 | * held. |
| 1776 | */ |
| 1777 | int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) |
| 1778 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1779 | struct sock *rsk; |
| 1780 | #ifdef CONFIG_TCP_MD5SIG |
| 1781 | /* |
| 1782 | * We really want to reject the packet as early as possible |
| 1783 | * if: |
| 1784 | * o We're expecting an MD5'd packet and this is no MD5 tcp option |
| 1785 | * o There is an MD5 option and we're not expecting one |
| 1786 | */ |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1787 | if (tcp_v4_inbound_md5_hash(sk, skb)) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1788 | goto discard; |
| 1789 | #endif |
| 1790 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
Eric Dumazet | 404e0a8 | 2012-07-29 23:20:37 +0000 | [diff] [blame] | 1792 | struct dst_entry *dst = sk->sk_rx_dst; |
| 1793 | |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1794 | sock_rps_save_rxhash(sk, skb); |
Eric Dumazet | 404e0a8 | 2012-07-29 23:20:37 +0000 | [diff] [blame] | 1795 | if (dst) { |
Eric Dumazet | 505fbcf | 2012-07-27 06:23:40 +0000 | [diff] [blame] | 1796 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || |
| 1797 | dst->ops->check(dst, 0) == NULL) { |
David S. Miller | 92101b3 | 2012-07-23 16:29:00 -0700 | [diff] [blame] | 1798 | dst_release(dst); |
| 1799 | sk->sk_rx_dst = NULL; |
| 1800 | } |
| 1801 | } |
Vijay Subramanian | c995ae2 | 2013-09-03 12:23:22 -0700 | [diff] [blame] | 1802 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1803 | return 0; |
| 1804 | } |
| 1805 | |
Arnaldo Carvalho de Melo | ab6a5bb | 2007-03-18 17:43:48 -0700 | [diff] [blame] | 1806 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1807 | goto csum_err; |
| 1808 | |
| 1809 | if (sk->sk_state == TCP_LISTEN) { |
| 1810 | struct sock *nsk = tcp_v4_hnd_req(sk, skb); |
| 1811 | if (!nsk) |
| 1812 | goto discard; |
| 1813 | |
| 1814 | if (nsk != sk) { |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1815 | sock_rps_save_rxhash(nsk, skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1816 | if (tcp_child_process(sk, nsk, skb)) { |
| 1817 | rsk = nsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1818 | goto reset; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1819 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1820 | return 0; |
| 1821 | } |
Eric Dumazet | ca55158 | 2010-06-03 09:03:58 +0000 | [diff] [blame] | 1822 | } else |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1823 | sock_rps_save_rxhash(sk, skb); |
Eric Dumazet | ca55158 | 2010-06-03 09:03:58 +0000 | [diff] [blame] | 1824 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1825 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1826 | rsk = sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | goto reset; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1828 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1829 | return 0; |
| 1830 | |
| 1831 | reset: |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1832 | tcp_v4_send_reset(rsk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | discard: |
| 1834 | kfree_skb(skb); |
| 1835 | /* Be careful here. If this function gets more complicated and |
| 1836 | * gcc suffers from register pressure on the x86, sk (in %ebx) |
| 1837 | * might be destroyed here. This current version compiles correctly, |
| 1838 | * but you have been warned. |
| 1839 | */ |
| 1840 | return 0; |
| 1841 | |
| 1842 | csum_err: |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1843 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1844 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1845 | goto discard; |
| 1846 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1847 | EXPORT_SYMBOL(tcp_v4_do_rcv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1848 | |
David S. Miller | 160eb5a | 2012-06-27 22:01:22 -0700 | [diff] [blame] | 1849 | void tcp_v4_early_demux(struct sk_buff *skb) |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1850 | { |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1851 | const struct iphdr *iph; |
| 1852 | const struct tcphdr *th; |
| 1853 | struct sock *sk; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1854 | |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1855 | if (skb->pkt_type != PACKET_HOST) |
David S. Miller | 160eb5a | 2012-06-27 22:01:22 -0700 | [diff] [blame] | 1856 | return; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1857 | |
Eric Dumazet | 45f00f9 | 2012-10-22 21:42:47 +0000 | [diff] [blame] | 1858 | 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] | 1859 | return; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1860 | |
| 1861 | iph = ip_hdr(skb); |
Eric Dumazet | 45f00f9 | 2012-10-22 21:42:47 +0000 | [diff] [blame] | 1862 | th = tcp_hdr(skb); |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1863 | |
| 1864 | if (th->doff < sizeof(struct tcphdr) / 4) |
David S. Miller | 160eb5a | 2012-06-27 22:01:22 -0700 | [diff] [blame] | 1865 | return; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1866 | |
Eric Dumazet | 45f00f9 | 2012-10-22 21:42:47 +0000 | [diff] [blame] | 1867 | sk = __inet_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1868 | iph->saddr, th->source, |
Vijay Subramanian | 7011d08 | 2012-06-23 17:38:10 +0000 | [diff] [blame] | 1869 | iph->daddr, ntohs(th->dest), |
Eric Dumazet | 9cb429d | 2012-07-24 01:19:31 +0000 | [diff] [blame] | 1870 | skb->skb_iif); |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1871 | if (sk) { |
| 1872 | skb->sk = sk; |
| 1873 | skb->destructor = sock_edemux; |
| 1874 | if (sk->sk_state != TCP_TIME_WAIT) { |
| 1875 | struct dst_entry *dst = sk->sk_rx_dst; |
Eric Dumazet | 505fbcf | 2012-07-27 06:23:40 +0000 | [diff] [blame] | 1876 | |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1877 | if (dst) |
| 1878 | dst = dst_check(dst, 0); |
David S. Miller | 92101b3 | 2012-07-23 16:29:00 -0700 | [diff] [blame] | 1879 | if (dst && |
Eric Dumazet | 505fbcf | 2012-07-27 06:23:40 +0000 | [diff] [blame] | 1880 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
David S. Miller | 92101b3 | 2012-07-23 16:29:00 -0700 | [diff] [blame] | 1881 | skb_dst_set_noref(skb, dst); |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1882 | } |
| 1883 | } |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1884 | } |
| 1885 | |
Eric Dumazet | b2fb4f5 | 2013-03-06 12:58:01 +0000 | [diff] [blame] | 1886 | /* Packet is added to VJ-style prequeue for processing in process |
| 1887 | * context, if a reader task is waiting. Apparently, this exciting |
| 1888 | * idea (VJ's mail "Re: query about TCP header on tcp-ip" of 07 Sep 93) |
| 1889 | * failed somewhere. Latency? Burstiness? Well, at least now we will |
| 1890 | * see, why it failed. 8)8) --ANK |
| 1891 | * |
| 1892 | */ |
| 1893 | bool tcp_prequeue(struct sock *sk, struct sk_buff *skb) |
| 1894 | { |
| 1895 | struct tcp_sock *tp = tcp_sk(sk); |
| 1896 | |
| 1897 | if (sysctl_tcp_low_latency || !tp->ucopy.task) |
| 1898 | return false; |
| 1899 | |
| 1900 | if (skb->len <= tcp_hdrlen(skb) && |
| 1901 | skb_queue_len(&tp->ucopy.prequeue) == 0) |
| 1902 | return false; |
| 1903 | |
David S. Miller | 5871768 | 2013-04-30 03:50:54 -0400 | [diff] [blame] | 1904 | skb_dst_force(skb); |
Eric Dumazet | b2fb4f5 | 2013-03-06 12:58:01 +0000 | [diff] [blame] | 1905 | __skb_queue_tail(&tp->ucopy.prequeue, skb); |
| 1906 | tp->ucopy.memory += skb->truesize; |
| 1907 | if (tp->ucopy.memory > sk->sk_rcvbuf) { |
| 1908 | struct sk_buff *skb1; |
| 1909 | |
| 1910 | BUG_ON(sock_owned_by_user(sk)); |
| 1911 | |
| 1912 | while ((skb1 = __skb_dequeue(&tp->ucopy.prequeue)) != NULL) { |
| 1913 | sk_backlog_rcv(sk, skb1); |
| 1914 | NET_INC_STATS_BH(sock_net(sk), |
| 1915 | LINUX_MIB_TCPPREQUEUEDROPPED); |
| 1916 | } |
| 1917 | |
| 1918 | tp->ucopy.memory = 0; |
| 1919 | } else if (skb_queue_len(&tp->ucopy.prequeue) == 1) { |
| 1920 | wake_up_interruptible_sync_poll(sk_sleep(sk), |
| 1921 | POLLIN | POLLRDNORM | POLLRDBAND); |
| 1922 | if (!inet_csk_ack_scheduled(sk)) |
| 1923 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, |
| 1924 | (3 * tcp_rto_min(sk)) / 4, |
| 1925 | TCP_RTO_MAX); |
| 1926 | } |
| 1927 | return true; |
| 1928 | } |
| 1929 | EXPORT_SYMBOL(tcp_prequeue); |
| 1930 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1931 | /* |
| 1932 | * From tcp_input.c |
| 1933 | */ |
| 1934 | |
| 1935 | int tcp_v4_rcv(struct sk_buff *skb) |
| 1936 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1937 | const struct iphdr *iph; |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1938 | const struct tcphdr *th; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1939 | struct sock *sk; |
| 1940 | int ret; |
Pavel Emelyanov | a86b1e3 | 2008-07-16 20:20:58 -0700 | [diff] [blame] | 1941 | struct net *net = dev_net(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1942 | |
| 1943 | if (skb->pkt_type != PACKET_HOST) |
| 1944 | goto discard_it; |
| 1945 | |
| 1946 | /* Count it even if it's bad */ |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1947 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1948 | |
| 1949 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) |
| 1950 | goto discard_it; |
| 1951 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1952 | th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1953 | |
| 1954 | if (th->doff < sizeof(struct tcphdr) / 4) |
| 1955 | goto bad_packet; |
| 1956 | if (!pskb_may_pull(skb, th->doff * 4)) |
| 1957 | goto discard_it; |
| 1958 | |
| 1959 | /* An explanation is required here, I think. |
| 1960 | * Packet length and doff are validated by header prediction, |
Stephen Hemminger | caa20d9a | 2005-11-10 17:13:47 -0800 | [diff] [blame] | 1961 | * provided case of th->doff==0 is eliminated. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1962 | * So, we defer the checks. */ |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 1963 | if (!skb_csum_unnecessary(skb) && tcp_v4_checksum_init(skb)) |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1964 | goto csum_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1965 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1966 | th = tcp_hdr(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1967 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1968 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
| 1969 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + |
| 1970 | skb->len - th->doff * 4); |
| 1971 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); |
| 1972 | TCP_SKB_CB(skb)->when = 0; |
Eric Dumazet | b82d1bb | 2011-09-27 02:20:08 -0400 | [diff] [blame] | 1973 | TCP_SKB_CB(skb)->ip_dsfield = ipv4_get_dsfield(iph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1974 | TCP_SKB_CB(skb)->sacked = 0; |
| 1975 | |
Arnaldo Carvalho de Melo | 9a1f27c | 2008-10-07 11:41:57 -0700 | [diff] [blame] | 1976 | sk = __inet_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1977 | if (!sk) |
| 1978 | goto no_tcp_socket; |
| 1979 | |
Eric Dumazet | bb134d5 | 2010-03-09 05:55:56 +0000 | [diff] [blame] | 1980 | process: |
| 1981 | if (sk->sk_state == TCP_TIME_WAIT) |
| 1982 | goto do_time_wait; |
| 1983 | |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 1984 | if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { |
| 1985 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); |
Stephen Hemminger | d218d11 | 2010-01-11 16:28:01 -0800 | [diff] [blame] | 1986 | goto discard_and_relse; |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 1987 | } |
Stephen Hemminger | d218d11 | 2010-01-11 16:28:01 -0800 | [diff] [blame] | 1988 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1989 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 1990 | goto discard_and_relse; |
Patrick McHardy | b59c270 | 2006-01-06 23:06:10 -0800 | [diff] [blame] | 1991 | nf_reset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1992 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 1993 | if (sk_filter(sk, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | goto discard_and_relse; |
| 1995 | |
Eliezer Tamir | 8b80cda | 2013-07-10 17:13:26 +0300 | [diff] [blame] | 1996 | sk_mark_napi_id(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | skb->dev = NULL; |
| 1998 | |
Ingo Molnar | c636618 | 2006-07-03 00:25:13 -0700 | [diff] [blame] | 1999 | bh_lock_sock_nested(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2000 | ret = 0; |
| 2001 | if (!sock_owned_by_user(sk)) { |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 2002 | #ifdef CONFIG_NET_DMA |
| 2003 | struct tcp_sock *tp = tcp_sk(sk); |
| 2004 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
Dave Jiang | a2bd114 | 2012-04-04 16:10:46 -0700 | [diff] [blame] | 2005 | tp->ucopy.dma_chan = net_dma_find_channel(); |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 2006 | if (tp->ucopy.dma_chan) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2007 | ret = tcp_v4_do_rcv(sk, skb); |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 2008 | else |
| 2009 | #endif |
| 2010 | { |
| 2011 | if (!tcp_prequeue(sk, skb)) |
Shan Wei | ae8d7f8 | 2009-05-05 01:01:29 +0000 | [diff] [blame] | 2012 | ret = tcp_v4_do_rcv(sk, skb); |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 2013 | } |
Eric Dumazet | da882c1 | 2012-04-22 23:38:54 +0000 | [diff] [blame] | 2014 | } else if (unlikely(sk_add_backlog(sk, skb, |
| 2015 | sk->sk_rcvbuf + sk->sk_sndbuf))) { |
Zhu Yi | 6b03a53 | 2010-03-04 18:01:41 +0000 | [diff] [blame] | 2016 | bh_unlock_sock(sk); |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 2017 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
Zhu Yi | 6b03a53 | 2010-03-04 18:01:41 +0000 | [diff] [blame] | 2018 | goto discard_and_relse; |
| 2019 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | bh_unlock_sock(sk); |
| 2021 | |
| 2022 | sock_put(sk); |
| 2023 | |
| 2024 | return ret; |
| 2025 | |
| 2026 | no_tcp_socket: |
| 2027 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 2028 | goto discard_it; |
| 2029 | |
| 2030 | if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 2031 | csum_error: |
| 2032 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2033 | bad_packet: |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 2034 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2035 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2036 | tcp_v4_send_reset(NULL, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | } |
| 2038 | |
| 2039 | discard_it: |
| 2040 | /* Discard frame. */ |
| 2041 | kfree_skb(skb); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2042 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2043 | |
| 2044 | discard_and_relse: |
| 2045 | sock_put(sk); |
| 2046 | goto discard_it; |
| 2047 | |
| 2048 | do_time_wait: |
| 2049 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 2050 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2051 | goto discard_it; |
| 2052 | } |
| 2053 | |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 2054 | if (skb->len < (th->doff << 2)) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 2055 | inet_twsk_put(inet_twsk(sk)); |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 2056 | goto bad_packet; |
| 2057 | } |
| 2058 | if (tcp_checksum_complete(skb)) { |
| 2059 | inet_twsk_put(inet_twsk(sk)); |
| 2060 | goto csum_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2061 | } |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 2062 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2063 | case TCP_TW_SYN: { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 2064 | struct sock *sk2 = inet_lookup_listener(dev_net(skb->dev), |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 2065 | &tcp_hashinfo, |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 2066 | iph->saddr, th->source, |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 2067 | iph->daddr, th->dest, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2068 | inet_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2069 | if (sk2) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 2070 | inet_twsk_deschedule(inet_twsk(sk), &tcp_death_row); |
| 2071 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2072 | sk = sk2; |
| 2073 | goto process; |
| 2074 | } |
| 2075 | /* Fall through to ACK */ |
| 2076 | } |
| 2077 | case TCP_TW_ACK: |
| 2078 | tcp_v4_timewait_ack(sk, skb); |
| 2079 | break; |
| 2080 | case TCP_TW_RST: |
| 2081 | goto no_tcp_socket; |
| 2082 | case TCP_TW_SUCCESS:; |
| 2083 | } |
| 2084 | goto discard_it; |
| 2085 | } |
| 2086 | |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 2087 | static struct timewait_sock_ops tcp_timewait_sock_ops = { |
| 2088 | .twsk_obj_size = sizeof(struct tcp_timewait_sock), |
| 2089 | .twsk_unique = tcp_twsk_unique, |
| 2090 | .twsk_destructor= tcp_twsk_destructor, |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 2091 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | |
Eric Dumazet | 63d02d1 | 2012-08-09 14:11:00 +0000 | [diff] [blame] | 2093 | 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] | 2094 | { |
| 2095 | struct dst_entry *dst = skb_dst(skb); |
| 2096 | |
| 2097 | dst_hold(dst); |
| 2098 | sk->sk_rx_dst = dst; |
| 2099 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; |
| 2100 | } |
Eric Dumazet | 63d02d1 | 2012-08-09 14:11:00 +0000 | [diff] [blame] | 2101 | EXPORT_SYMBOL(inet_sk_rx_dst_set); |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 2102 | |
Stephen Hemminger | 3b401a8 | 2009-09-01 19:25:04 +0000 | [diff] [blame] | 2103 | const struct inet_connection_sock_af_ops ipv4_specific = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2104 | .queue_xmit = ip_queue_xmit, |
| 2105 | .send_check = tcp_v4_send_check, |
| 2106 | .rebuild_header = inet_sk_rebuild_header, |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 2107 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2108 | .conn_request = tcp_v4_conn_request, |
| 2109 | .syn_recv_sock = tcp_v4_syn_recv_sock, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2110 | .net_header_len = sizeof(struct iphdr), |
| 2111 | .setsockopt = ip_setsockopt, |
| 2112 | .getsockopt = ip_getsockopt, |
| 2113 | .addr2sockaddr = inet_csk_addr2sockaddr, |
| 2114 | .sockaddr_len = sizeof(struct sockaddr_in), |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 2115 | .bind_conflict = inet_csk_bind_conflict, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2116 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2117 | .compat_setsockopt = compat_ip_setsockopt, |
| 2118 | .compat_getsockopt = compat_ip_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2119 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2120 | }; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2121 | EXPORT_SYMBOL(ipv4_specific); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2122 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2123 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 2124 | static const struct tcp_sock_af_ops tcp_sock_ipv4_specific = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2125 | .md5_lookup = tcp_v4_md5_lookup, |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 2126 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2127 | .md5_parse = tcp_v4_parse_md5_keys, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2128 | }; |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 2129 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2130 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2131 | /* NOTE: A lot of things set to zero explicitly by call to |
| 2132 | * sk_alloc() so need not be done here. |
| 2133 | */ |
| 2134 | static int tcp_v4_init_sock(struct sock *sk) |
| 2135 | { |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2136 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2137 | |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 2138 | tcp_init_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2139 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 2140 | icsk->icsk_af_ops = &ipv4_specific; |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 2141 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2142 | #ifdef CONFIG_TCP_MD5SIG |
David S. Miller | ac807fa | 2012-04-23 03:21:58 -0400 | [diff] [blame] | 2143 | tcp_sk(sk)->af_specific = &tcp_sock_ipv4_specific; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2144 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2146 | return 0; |
| 2147 | } |
| 2148 | |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 2149 | void tcp_v4_destroy_sock(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2150 | { |
| 2151 | struct tcp_sock *tp = tcp_sk(sk); |
| 2152 | |
| 2153 | tcp_clear_xmit_timers(sk); |
| 2154 | |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2155 | tcp_cleanup_congestion_control(sk); |
Stephen Hemminger | 317a76f | 2005-06-23 12:19:55 -0700 | [diff] [blame] | 2156 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2157 | /* Cleanup up the write buffer. */ |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 2158 | tcp_write_queue_purge(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2159 | |
| 2160 | /* Cleans up our, hopefully empty, out_of_order_queue. */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2161 | __skb_queue_purge(&tp->out_of_order_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2162 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2163 | #ifdef CONFIG_TCP_MD5SIG |
| 2164 | /* Clean up the MD5 key list, if any */ |
| 2165 | if (tp->md5sig_info) { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 2166 | tcp_clear_md5_list(sk); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 2167 | kfree_rcu(tp->md5sig_info, rcu); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2168 | tp->md5sig_info = NULL; |
| 2169 | } |
| 2170 | #endif |
| 2171 | |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 2172 | #ifdef CONFIG_NET_DMA |
| 2173 | /* Cleans up our sk_async_wait_queue */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2174 | __skb_queue_purge(&sk->sk_async_wait_queue); |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 2175 | #endif |
| 2176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2177 | /* Clean prequeue, it must be empty really */ |
| 2178 | __skb_queue_purge(&tp->ucopy.prequeue); |
| 2179 | |
| 2180 | /* Clean up a referenced TCP bind bucket. */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2181 | if (inet_csk(sk)->icsk_bind_hash) |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 2182 | inet_put_port(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2183 | |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 2184 | BUG_ON(tp->fastopen_rsk != NULL); |
William Allen Simpson | 435cf55 | 2009-12-02 18:17:05 +0000 | [diff] [blame] | 2185 | |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 2186 | /* If socket is aborted during connect operation */ |
| 2187 | tcp_free_fastopen_req(tp); |
| 2188 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2189 | sk_sockets_allocated_dec(sk); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 2190 | sock_release_memcg(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2192 | EXPORT_SYMBOL(tcp_v4_destroy_sock); |
| 2193 | |
| 2194 | #ifdef CONFIG_PROC_FS |
| 2195 | /* Proc filesystem TCP sock list dumping. */ |
| 2196 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2197 | /* |
| 2198 | * Get next listener socket follow cur. If cur is NULL, get first socket |
| 2199 | * starting from bucket given in st->bucket; when st->bucket is zero the |
| 2200 | * very first socket in the hash table is returned. |
| 2201 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2202 | static void *listening_get_next(struct seq_file *seq, void *cur) |
| 2203 | { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2204 | struct inet_connection_sock *icsk; |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 2205 | struct hlist_nulls_node *node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2206 | struct sock *sk = cur; |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2207 | struct inet_listen_hashbucket *ilb; |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2208 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 2209 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2210 | |
| 2211 | if (!sk) { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2212 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2213 | spin_lock_bh(&ilb->lock); |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 2214 | sk = sk_nulls_head(&ilb->head); |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2215 | st->offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2216 | goto get_sk; |
| 2217 | } |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2218 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2219 | ++st->num; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2220 | ++st->offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | |
| 2222 | if (st->state == TCP_SEQ_STATE_OPENREQ) { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 2223 | struct request_sock *req = cur; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2224 | |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 2225 | icsk = inet_csk(st->syn_wait_sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2226 | req = req->dl_next; |
| 2227 | while (1) { |
| 2228 | while (req) { |
Daniel Lezcano | bdccc4c | 2008-07-19 00:15:13 -0700 | [diff] [blame] | 2229 | if (req->rsk_ops->family == st->family) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2230 | cur = req; |
| 2231 | goto out; |
| 2232 | } |
| 2233 | req = req->dl_next; |
| 2234 | } |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 2235 | if (++st->sbucket >= icsk->icsk_accept_queue.listen_opt->nr_table_entries) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2236 | break; |
| 2237 | get_req: |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2238 | req = icsk->icsk_accept_queue.listen_opt->syn_table[st->sbucket]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2239 | } |
Eric Dumazet | 1bde5ac | 2010-12-23 09:32:46 -0800 | [diff] [blame] | 2240 | sk = sk_nulls_next(st->syn_wait_sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2241 | st->state = TCP_SEQ_STATE_LISTENING; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2242 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2243 | } else { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2244 | icsk = inet_csk(sk); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2245 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
| 2246 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2247 | goto start_req; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2248 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
Eric Dumazet | 1bde5ac | 2010-12-23 09:32:46 -0800 | [diff] [blame] | 2249 | sk = sk_nulls_next(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2250 | } |
| 2251 | get_sk: |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 2252 | sk_nulls_for_each_from(sk, node) { |
Pavel Emelyanov | 8475ef9 | 2010-11-22 03:26:12 +0000 | [diff] [blame] | 2253 | if (!net_eq(sock_net(sk), net)) |
| 2254 | continue; |
| 2255 | if (sk->sk_family == st->family) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2256 | cur = sk; |
| 2257 | goto out; |
| 2258 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2259 | icsk = inet_csk(sk); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2260 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
| 2261 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2262 | start_req: |
| 2263 | st->uid = sock_i_uid(sk); |
| 2264 | st->syn_wait_sk = sk; |
| 2265 | st->state = TCP_SEQ_STATE_OPENREQ; |
| 2266 | st->sbucket = 0; |
| 2267 | goto get_req; |
| 2268 | } |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2269 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2270 | } |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2271 | spin_unlock_bh(&ilb->lock); |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2272 | st->offset = 0; |
Arnaldo Carvalho de Melo | 0f7ff92 | 2005-08-09 19:59:44 -0700 | [diff] [blame] | 2273 | if (++st->bucket < INET_LHTABLE_SIZE) { |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2274 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
| 2275 | spin_lock_bh(&ilb->lock); |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 2276 | sk = sk_nulls_head(&ilb->head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2277 | goto get_sk; |
| 2278 | } |
| 2279 | cur = NULL; |
| 2280 | out: |
| 2281 | return cur; |
| 2282 | } |
| 2283 | |
| 2284 | static void *listening_get_idx(struct seq_file *seq, loff_t *pos) |
| 2285 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2286 | struct tcp_iter_state *st = seq->private; |
| 2287 | void *rc; |
| 2288 | |
| 2289 | st->bucket = 0; |
| 2290 | st->offset = 0; |
| 2291 | rc = listening_get_next(seq, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2292 | |
| 2293 | while (rc && *pos) { |
| 2294 | rc = listening_get_next(seq, rc); |
| 2295 | --*pos; |
| 2296 | } |
| 2297 | return rc; |
| 2298 | } |
| 2299 | |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2300 | static inline bool empty_bucket(const struct tcp_iter_state *st) |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2301 | { |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2302 | return hlist_nulls_empty(&tcp_hashinfo.ehash[st->bucket].chain); |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2303 | } |
| 2304 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2305 | /* |
| 2306 | * Get first established socket starting from bucket given in st->bucket. |
| 2307 | * If st->bucket is zero, the very first socket in the hash is returned. |
| 2308 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2309 | static void *established_get_first(struct seq_file *seq) |
| 2310 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2311 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 2312 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2313 | void *rc = NULL; |
| 2314 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2315 | st->offset = 0; |
| 2316 | for (; st->bucket <= tcp_hashinfo.ehash_mask; ++st->bucket) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2317 | struct sock *sk; |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2318 | struct hlist_nulls_node *node; |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2319 | spinlock_t *lock = inet_ehash_lockp(&tcp_hashinfo, st->bucket); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2320 | |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2321 | /* Lockless fast path for the common case of empty buckets */ |
| 2322 | if (empty_bucket(st)) |
| 2323 | continue; |
| 2324 | |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2325 | spin_lock_bh(lock); |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2326 | sk_nulls_for_each(sk, node, &tcp_hashinfo.ehash[st->bucket].chain) { |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 2327 | if (sk->sk_family != st->family || |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2328 | !net_eq(sock_net(sk), net)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2329 | continue; |
| 2330 | } |
| 2331 | rc = sk; |
| 2332 | goto out; |
| 2333 | } |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2334 | spin_unlock_bh(lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2335 | } |
| 2336 | out: |
| 2337 | return rc; |
| 2338 | } |
| 2339 | |
| 2340 | static void *established_get_next(struct seq_file *seq, void *cur) |
| 2341 | { |
| 2342 | struct sock *sk = cur; |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2343 | struct hlist_nulls_node *node; |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2344 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 2345 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2346 | |
| 2347 | ++st->num; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2348 | ++st->offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2349 | |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2350 | sk = sk_nulls_next(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2351 | |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2352 | sk_nulls_for_each_from(sk, node) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2353 | if (sk->sk_family == st->family && net_eq(sock_net(sk), net)) |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2354 | return sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2355 | } |
| 2356 | |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2357 | spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
| 2358 | ++st->bucket; |
| 2359 | return established_get_first(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2360 | } |
| 2361 | |
| 2362 | static void *established_get_idx(struct seq_file *seq, loff_t pos) |
| 2363 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2364 | struct tcp_iter_state *st = seq->private; |
| 2365 | void *rc; |
| 2366 | |
| 2367 | st->bucket = 0; |
| 2368 | rc = established_get_first(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2369 | |
| 2370 | while (rc && pos) { |
| 2371 | rc = established_get_next(seq, rc); |
| 2372 | --pos; |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 2373 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2374 | return rc; |
| 2375 | } |
| 2376 | |
| 2377 | static void *tcp_get_idx(struct seq_file *seq, loff_t pos) |
| 2378 | { |
| 2379 | void *rc; |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2380 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2381 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2382 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2383 | rc = listening_get_idx(seq, &pos); |
| 2384 | |
| 2385 | if (!rc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2386 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
| 2387 | rc = established_get_idx(seq, pos); |
| 2388 | } |
| 2389 | |
| 2390 | return rc; |
| 2391 | } |
| 2392 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2393 | static void *tcp_seek_last_pos(struct seq_file *seq) |
| 2394 | { |
| 2395 | struct tcp_iter_state *st = seq->private; |
| 2396 | int offset = st->offset; |
| 2397 | int orig_num = st->num; |
| 2398 | void *rc = NULL; |
| 2399 | |
| 2400 | switch (st->state) { |
| 2401 | case TCP_SEQ_STATE_OPENREQ: |
| 2402 | case TCP_SEQ_STATE_LISTENING: |
| 2403 | if (st->bucket >= INET_LHTABLE_SIZE) |
| 2404 | break; |
| 2405 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2406 | rc = listening_get_next(seq, NULL); |
| 2407 | while (offset-- && rc) |
| 2408 | rc = listening_get_next(seq, rc); |
| 2409 | if (rc) |
| 2410 | break; |
| 2411 | st->bucket = 0; |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2412 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2413 | /* Fallthrough */ |
| 2414 | case TCP_SEQ_STATE_ESTABLISHED: |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2415 | if (st->bucket > tcp_hashinfo.ehash_mask) |
| 2416 | break; |
| 2417 | rc = established_get_first(seq); |
| 2418 | while (offset-- && rc) |
| 2419 | rc = established_get_next(seq, rc); |
| 2420 | } |
| 2421 | |
| 2422 | st->num = orig_num; |
| 2423 | |
| 2424 | return rc; |
| 2425 | } |
| 2426 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2427 | static void *tcp_seq_start(struct seq_file *seq, loff_t *pos) |
| 2428 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2429 | struct tcp_iter_state *st = seq->private; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2430 | void *rc; |
| 2431 | |
| 2432 | if (*pos && *pos == st->last_pos) { |
| 2433 | rc = tcp_seek_last_pos(seq); |
| 2434 | if (rc) |
| 2435 | goto out; |
| 2436 | } |
| 2437 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2438 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2439 | st->num = 0; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2440 | st->bucket = 0; |
| 2441 | st->offset = 0; |
| 2442 | rc = *pos ? tcp_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| 2443 | |
| 2444 | out: |
| 2445 | st->last_pos = *pos; |
| 2446 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2447 | } |
| 2448 | |
| 2449 | static void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2450 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2451 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2452 | void *rc = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2453 | |
| 2454 | if (v == SEQ_START_TOKEN) { |
| 2455 | rc = tcp_get_idx(seq, 0); |
| 2456 | goto out; |
| 2457 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2458 | |
| 2459 | switch (st->state) { |
| 2460 | case TCP_SEQ_STATE_OPENREQ: |
| 2461 | case TCP_SEQ_STATE_LISTENING: |
| 2462 | rc = listening_get_next(seq, v); |
| 2463 | if (!rc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2464 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2465 | st->bucket = 0; |
| 2466 | st->offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2467 | rc = established_get_first(seq); |
| 2468 | } |
| 2469 | break; |
| 2470 | case TCP_SEQ_STATE_ESTABLISHED: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2471 | rc = established_get_next(seq, v); |
| 2472 | break; |
| 2473 | } |
| 2474 | out: |
| 2475 | ++*pos; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2476 | st->last_pos = *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2477 | return rc; |
| 2478 | } |
| 2479 | |
| 2480 | static void tcp_seq_stop(struct seq_file *seq, void *v) |
| 2481 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2482 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2483 | |
| 2484 | switch (st->state) { |
| 2485 | case TCP_SEQ_STATE_OPENREQ: |
| 2486 | if (v) { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2487 | struct inet_connection_sock *icsk = inet_csk(st->syn_wait_sk); |
| 2488 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2489 | } |
| 2490 | case TCP_SEQ_STATE_LISTENING: |
| 2491 | if (v != SEQ_START_TOKEN) |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2492 | spin_unlock_bh(&tcp_hashinfo.listening_hash[st->bucket].lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2493 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2494 | case TCP_SEQ_STATE_ESTABLISHED: |
| 2495 | if (v) |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2496 | spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2497 | break; |
| 2498 | } |
| 2499 | } |
| 2500 | |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2501 | int tcp_seq_open(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2502 | { |
Al Viro | d9dda78 | 2013-03-31 18:16:14 -0400 | [diff] [blame] | 2503 | struct tcp_seq_afinfo *afinfo = PDE_DATA(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2504 | struct tcp_iter_state *s; |
Denis V. Lunev | 52d6f3f | 2008-04-13 22:12:41 -0700 | [diff] [blame] | 2505 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2506 | |
Denis V. Lunev | 52d6f3f | 2008-04-13 22:12:41 -0700 | [diff] [blame] | 2507 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
| 2508 | sizeof(struct tcp_iter_state)); |
| 2509 | if (err < 0) |
| 2510 | return err; |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 2511 | |
Denis V. Lunev | 52d6f3f | 2008-04-13 22:12:41 -0700 | [diff] [blame] | 2512 | s = ((struct seq_file *)file->private_data)->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2513 | s->family = afinfo->family; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2514 | s->last_pos = 0; |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 2515 | return 0; |
| 2516 | } |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2517 | EXPORT_SYMBOL(tcp_seq_open); |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 2518 | |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2519 | int tcp_proc_register(struct net *net, struct tcp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2520 | { |
| 2521 | int rc = 0; |
| 2522 | struct proc_dir_entry *p; |
| 2523 | |
Denis V. Lunev | 9427c4b | 2008-04-13 22:12:13 -0700 | [diff] [blame] | 2524 | afinfo->seq_ops.start = tcp_seq_start; |
| 2525 | afinfo->seq_ops.next = tcp_seq_next; |
| 2526 | afinfo->seq_ops.stop = tcp_seq_stop; |
| 2527 | |
Denis V. Lunev | 84841c3 | 2008-05-02 04:10:08 -0700 | [diff] [blame] | 2528 | 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] | 2529 | afinfo->seq_fops, afinfo); |
Denis V. Lunev | 84841c3 | 2008-05-02 04:10:08 -0700 | [diff] [blame] | 2530 | if (!p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2531 | rc = -ENOMEM; |
| 2532 | return rc; |
| 2533 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2534 | EXPORT_SYMBOL(tcp_proc_register); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2535 | |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2536 | void tcp_proc_unregister(struct net *net, struct tcp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2537 | { |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 2538 | remove_proc_entry(afinfo->name, net->proc_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2539 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2540 | EXPORT_SYMBOL(tcp_proc_unregister); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2541 | |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2542 | static void get_openreq4(const struct sock *sk, const struct request_sock *req, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2543 | struct seq_file *f, int i, kuid_t uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2544 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2545 | const struct inet_request_sock *ireq = inet_rsk(req); |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2546 | long delta = req->expires - jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2547 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2548 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2549 | " %02X %08X:%08X %02X:%08lX %08X %5u %8d %u %d %pK", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2550 | i, |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 2551 | ireq->ir_loc_addr, |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 2552 | ntohs(inet_sk(sk)->inet_sport), |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 2553 | ireq->ir_rmt_addr, |
| 2554 | ntohs(ireq->ir_rmt_port), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2555 | TCP_SYN_RECV, |
| 2556 | 0, 0, /* could print option size, but that is af dependent. */ |
| 2557 | 1, /* timers active (only the expire timer) */ |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2558 | jiffies_delta_to_clock_t(delta), |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 2559 | req->num_timeout, |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 2560 | from_kuid_munged(seq_user_ns(f), uid), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2561 | 0, /* non standard timer */ |
| 2562 | 0, /* open_requests have no inode */ |
| 2563 | atomic_read(&sk->sk_refcnt), |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2564 | req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2565 | } |
| 2566 | |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2567 | 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] | 2568 | { |
| 2569 | int timer_active; |
| 2570 | unsigned long timer_expires; |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2571 | const struct tcp_sock *tp = tcp_sk(sk); |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2572 | const struct inet_connection_sock *icsk = inet_csk(sk); |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2573 | const struct inet_sock *inet = inet_sk(sk); |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 2574 | struct fastopen_queue *fastopenq = icsk->icsk_accept_queue.fastopenq; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 2575 | __be32 dest = inet->inet_daddr; |
| 2576 | __be32 src = inet->inet_rcv_saddr; |
| 2577 | __u16 destp = ntohs(inet->inet_dport); |
| 2578 | __u16 srcp = ntohs(inet->inet_sport); |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2579 | int rx_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2580 | |
Nandita Dukkipati | 6ba8a3b | 2013-03-11 10:00:43 +0000 | [diff] [blame] | 2581 | if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
| 2582 | icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS || |
| 2583 | icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2584 | timer_active = 1; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2585 | timer_expires = icsk->icsk_timeout; |
| 2586 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2587 | timer_active = 4; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2588 | timer_expires = icsk->icsk_timeout; |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2589 | } else if (timer_pending(&sk->sk_timer)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2590 | timer_active = 2; |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2591 | timer_expires = sk->sk_timer.expires; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2592 | } else { |
| 2593 | timer_active = 0; |
| 2594 | timer_expires = jiffies; |
| 2595 | } |
| 2596 | |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2597 | if (sk->sk_state == TCP_LISTEN) |
| 2598 | rx_queue = sk->sk_ack_backlog; |
| 2599 | else |
| 2600 | /* |
| 2601 | * because we dont lock socket, we might find a transient negative value |
| 2602 | */ |
| 2603 | rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); |
| 2604 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2605 | 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] | 2606 | "%08X %5u %8d %lu %d %pK %lu %lu %u %u %d", |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2607 | i, src, srcp, dest, destp, sk->sk_state, |
Sridhar Samudrala | 47da8ee | 2006-06-27 13:29:00 -0700 | [diff] [blame] | 2608 | tp->write_seq - tp->snd_una, |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2609 | rx_queue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2610 | timer_active, |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2611 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2612 | icsk->icsk_retransmits, |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 2613 | 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] | 2614 | icsk->icsk_probes_out, |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2615 | sock_i_ino(sk), |
| 2616 | atomic_read(&sk->sk_refcnt), sk, |
Stephen Hemminger | 7be8735 | 2008-06-27 20:00:19 -0700 | [diff] [blame] | 2617 | jiffies_to_clock_t(icsk->icsk_rto), |
| 2618 | jiffies_to_clock_t(icsk->icsk_ack.ato), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2619 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2620 | tp->snd_cwnd, |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 2621 | sk->sk_state == TCP_LISTEN ? |
| 2622 | (fastopenq ? fastopenq->max_qlen : 0) : |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2623 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2624 | } |
| 2625 | |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2626 | static void get_timewait4_sock(const struct inet_timewait_sock *tw, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2627 | struct seq_file *f, int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2628 | { |
Al Viro | 23f33c2 | 2006-09-27 18:43:50 -0700 | [diff] [blame] | 2629 | __be32 dest, src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2630 | __u16 destp, srcp; |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2631 | long delta = tw->tw_ttd - jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2632 | |
| 2633 | dest = tw->tw_daddr; |
| 2634 | src = tw->tw_rcv_saddr; |
| 2635 | destp = ntohs(tw->tw_dport); |
| 2636 | srcp = ntohs(tw->tw_sport); |
| 2637 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2638 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2639 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2640 | i, src, srcp, dest, destp, tw->tw_substate, 0, 0, |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2641 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2642 | atomic_read(&tw->tw_refcnt), tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2643 | } |
| 2644 | |
| 2645 | #define TMPSZ 150 |
| 2646 | |
| 2647 | static int tcp4_seq_show(struct seq_file *seq, void *v) |
| 2648 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2649 | struct tcp_iter_state *st; |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2650 | struct sock *sk = v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2651 | |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2652 | seq_setwidth(seq, TMPSZ - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2653 | if (v == SEQ_START_TOKEN) { |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2654 | seq_puts(seq, " sl local_address rem_address st tx_queue " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2655 | "rx_queue tr tm->when retrnsmt uid timeout " |
| 2656 | "inode"); |
| 2657 | goto out; |
| 2658 | } |
| 2659 | st = seq->private; |
| 2660 | |
| 2661 | switch (st->state) { |
| 2662 | case TCP_SEQ_STATE_LISTENING: |
| 2663 | case TCP_SEQ_STATE_ESTABLISHED: |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2664 | if (sk->sk_state == TCP_TIME_WAIT) |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2665 | get_timewait4_sock(v, seq, st->num); |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2666 | else |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2667 | get_tcp4_sock(v, seq, st->num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2668 | break; |
| 2669 | case TCP_SEQ_STATE_OPENREQ: |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2670 | get_openreq4(st->syn_wait_sk, v, seq, st->num, st->uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2671 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2672 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2673 | out: |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2674 | seq_pad(seq, '\n'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2675 | return 0; |
| 2676 | } |
| 2677 | |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2678 | static const struct file_operations tcp_afinfo_seq_fops = { |
| 2679 | .owner = THIS_MODULE, |
| 2680 | .open = tcp_seq_open, |
| 2681 | .read = seq_read, |
| 2682 | .llseek = seq_lseek, |
| 2683 | .release = seq_release_net |
| 2684 | }; |
| 2685 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2686 | static struct tcp_seq_afinfo tcp4_seq_afinfo = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2687 | .name = "tcp", |
| 2688 | .family = AF_INET, |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2689 | .seq_fops = &tcp_afinfo_seq_fops, |
Denis V. Lunev | 9427c4b | 2008-04-13 22:12:13 -0700 | [diff] [blame] | 2690 | .seq_ops = { |
| 2691 | .show = tcp4_seq_show, |
| 2692 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2693 | }; |
| 2694 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2695 | static int __net_init tcp4_proc_init_net(struct net *net) |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2696 | { |
| 2697 | return tcp_proc_register(net, &tcp4_seq_afinfo); |
| 2698 | } |
| 2699 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2700 | static void __net_exit tcp4_proc_exit_net(struct net *net) |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2701 | { |
| 2702 | tcp_proc_unregister(net, &tcp4_seq_afinfo); |
| 2703 | } |
| 2704 | |
| 2705 | static struct pernet_operations tcp4_net_ops = { |
| 2706 | .init = tcp4_proc_init_net, |
| 2707 | .exit = tcp4_proc_exit_net, |
| 2708 | }; |
| 2709 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2710 | int __init tcp4_proc_init(void) |
| 2711 | { |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2712 | return register_pernet_subsys(&tcp4_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2713 | } |
| 2714 | |
| 2715 | void tcp4_proc_exit(void) |
| 2716 | { |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2717 | unregister_pernet_subsys(&tcp4_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2718 | } |
| 2719 | #endif /* CONFIG_PROC_FS */ |
| 2720 | |
| 2721 | struct proto tcp_prot = { |
| 2722 | .name = "TCP", |
| 2723 | .owner = THIS_MODULE, |
| 2724 | .close = tcp_close, |
| 2725 | .connect = tcp_v4_connect, |
| 2726 | .disconnect = tcp_disconnect, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2727 | .accept = inet_csk_accept, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2728 | .ioctl = tcp_ioctl, |
| 2729 | .init = tcp_v4_init_sock, |
| 2730 | .destroy = tcp_v4_destroy_sock, |
| 2731 | .shutdown = tcp_shutdown, |
| 2732 | .setsockopt = tcp_setsockopt, |
| 2733 | .getsockopt = tcp_getsockopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2734 | .recvmsg = tcp_recvmsg, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 2735 | .sendmsg = tcp_sendmsg, |
| 2736 | .sendpage = tcp_sendpage, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2737 | .backlog_rcv = tcp_v4_do_rcv, |
Eric Dumazet | 46d3cea | 2012-07-11 05:50:31 +0000 | [diff] [blame] | 2738 | .release_cb = tcp_release_cb, |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 2739 | .mtu_reduced = tcp_v4_mtu_reduced, |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 2740 | .hash = inet_hash, |
| 2741 | .unhash = inet_unhash, |
| 2742 | .get_port = inet_csk_get_port, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2743 | .enter_memory_pressure = tcp_enter_memory_pressure, |
Eric Dumazet | c9bee3b7 | 2013-07-22 20:27:07 -0700 | [diff] [blame] | 2744 | .stream_memory_free = tcp_stream_memory_free, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2745 | .sockets_allocated = &tcp_sockets_allocated, |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 2746 | .orphan_count = &tcp_orphan_count, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2747 | .memory_allocated = &tcp_memory_allocated, |
| 2748 | .memory_pressure = &tcp_memory_pressure, |
Eric W. Biederman | a4fe34b | 2013-10-19 16:25:36 -0700 | [diff] [blame] | 2749 | .sysctl_mem = sysctl_tcp_mem, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2750 | .sysctl_wmem = sysctl_tcp_wmem, |
| 2751 | .sysctl_rmem = sysctl_tcp_rmem, |
| 2752 | .max_header = MAX_TCP_HEADER, |
| 2753 | .obj_size = sizeof(struct tcp_sock), |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2754 | .slab_flags = SLAB_DESTROY_BY_RCU, |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2755 | .twsk_prot = &tcp_timewait_sock_ops, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 2756 | .rsk_prot = &tcp_request_sock_ops, |
Pavel Emelyanov | 39d8cda | 2008-03-22 16:50:58 -0700 | [diff] [blame] | 2757 | .h.hashinfo = &tcp_hashinfo, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 2758 | .no_autobind = true, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2759 | #ifdef CONFIG_COMPAT |
| 2760 | .compat_setsockopt = compat_tcp_setsockopt, |
| 2761 | .compat_getsockopt = compat_tcp_getsockopt, |
| 2762 | #endif |
Andrew Morton | c255a45 | 2012-07-31 16:43:02 -0700 | [diff] [blame] | 2763 | #ifdef CONFIG_MEMCG_KMEM |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 2764 | .init_cgroup = tcp_init_cgroup, |
| 2765 | .destroy_cgroup = tcp_destroy_cgroup, |
| 2766 | .proto_cgroup = tcp_proto_cgroup, |
| 2767 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2768 | }; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2769 | EXPORT_SYMBOL(tcp_prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2770 | |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2771 | static int __net_init tcp_sk_init(struct net *net) |
| 2772 | { |
Hannes Frederic Sowa | 5d134f1 | 2013-01-05 16:10:48 +0000 | [diff] [blame] | 2773 | net->ipv4.sysctl_tcp_ecn = 2; |
Eric Dumazet | be9f4a4 | 2012-07-19 07:34:03 +0000 | [diff] [blame] | 2774 | return 0; |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2775 | } |
| 2776 | |
| 2777 | static void __net_exit tcp_sk_exit(struct net *net) |
| 2778 | { |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 2779 | } |
| 2780 | |
| 2781 | static void __net_exit tcp_sk_exit_batch(struct list_head *net_exit_list) |
| 2782 | { |
| 2783 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET); |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2784 | } |
| 2785 | |
| 2786 | static struct pernet_operations __net_initdata tcp_sk_ops = { |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 2787 | .init = tcp_sk_init, |
| 2788 | .exit = tcp_sk_exit, |
| 2789 | .exit_batch = tcp_sk_exit_batch, |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2790 | }; |
| 2791 | |
Denis V. Lunev | 9b0f976 | 2008-02-29 11:13:15 -0800 | [diff] [blame] | 2792 | void __init tcp_v4_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2793 | { |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2794 | inet_hashinfo_init(&tcp_hashinfo); |
Eric W. Biederman | 6a1b305 | 2009-02-22 00:10:18 -0800 | [diff] [blame] | 2795 | if (register_pernet_subsys(&tcp_sk_ops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2796 | panic("Failed to create the TCP control socket.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2797 | } |