Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * Implementation of the Transmission Control Protocol(TCP). |
| 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * IPv4 specific functions |
| 9 | * |
| 10 | * |
| 11 | * code split from: |
| 12 | * linux/ipv4/tcp.c |
| 13 | * linux/ipv4/tcp_input.c |
| 14 | * linux/ipv4/tcp_output.c |
| 15 | * |
| 16 | * See tcp.c for author information |
| 17 | * |
| 18 | * This program is free software; you can redistribute it and/or |
| 19 | * modify it under the terms of the GNU General Public License |
| 20 | * as published by the Free Software Foundation; either version |
| 21 | * 2 of the License, or (at your option) any later version. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * Changes: |
| 26 | * David S. Miller : New socket lookup architecture. |
| 27 | * This code is dedicated to John Dyson. |
| 28 | * David S. Miller : Change semantics of established hash, |
| 29 | * half is devoted to TIME_WAIT sockets |
| 30 | * and the rest go in the other half. |
| 31 | * Andi Kleen : Add support for syncookies and fixed |
| 32 | * some bugs: ip options weren't passed to |
| 33 | * the TCP layer, missed a check for an |
| 34 | * ACK bit. |
| 35 | * Andi Kleen : Implemented fast path mtu discovery. |
| 36 | * Fixed many serious bugs in the |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 37 | * request_sock handling and moved |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | * most of it into the af independent code. |
| 39 | * Added tail drop and some other bugfixes. |
Stephen Hemminger | caa20d9a | 2005-11-10 17:13:47 -0800 | [diff] [blame] | 40 | * Added new listen semantics. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | * Mike McLagan : Routing by source |
| 42 | * Juan Jose Ciarlante: ip_dynaddr bits |
| 43 | * Andi Kleen: various fixes. |
| 44 | * Vitaly E. Lavrov : Transparent proxy revived after year |
| 45 | * coma. |
| 46 | * Andi Kleen : Fix new listen. |
| 47 | * Andi Kleen : Fix accept error reporting. |
| 48 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which |
| 49 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind |
| 50 | * a single port at the same time. |
| 51 | */ |
| 52 | |
Joe Perches | afd46503 | 2012-03-12 07:03:32 +0000 | [diff] [blame] | 53 | #define pr_fmt(fmt) "TCP: " fmt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
Herbert Xu | eb4dea5 | 2008-12-29 23:04:08 -0800 | [diff] [blame] | 55 | #include <linux/bottom_half.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #include <linux/types.h> |
| 57 | #include <linux/fcntl.h> |
| 58 | #include <linux/module.h> |
| 59 | #include <linux/random.h> |
| 60 | #include <linux/cache.h> |
| 61 | #include <linux/jhash.h> |
| 62 | #include <linux/init.h> |
| 63 | #include <linux/times.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 64 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 66 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | #include <net/icmp.h> |
Arnaldo Carvalho de Melo | 304a161 | 2005-08-09 19:59:20 -0700 | [diff] [blame] | 68 | #include <net/inet_hashtables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | #include <net/tcp.h> |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 70 | #include <net/transp_v6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | #include <net/ipv6.h> |
| 72 | #include <net/inet_common.h> |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 73 | #include <net/timewait_sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | #include <net/xfrm.h> |
David S. Miller | 6e5714e | 2011-08-03 20:50:44 -0700 | [diff] [blame] | 75 | #include <net/secure_seq.h> |
Eliezer Tamir | 076bb0c | 2013-07-10 17:13:17 +0300 | [diff] [blame] | 76 | #include <net/busy_poll.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
| 78 | #include <linux/inet.h> |
| 79 | #include <linux/ipv6.h> |
| 80 | #include <linux/stddef.h> |
| 81 | #include <linux/proc_fs.h> |
| 82 | #include <linux/seq_file.h> |
| 83 | |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 84 | #include <crypto/hash.h> |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 85 | #include <linux/scatterlist.h> |
| 86 | |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 87 | int sysctl_tcp_tw_reuse __read_mostly; |
| 88 | int sysctl_tcp_low_latency __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 90 | #ifdef CONFIG_TCP_MD5SIG |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 91 | 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] | 92 | __be32 daddr, __be32 saddr, const struct tcphdr *th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 93 | #endif |
| 94 | |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 95 | struct inet_hashinfo tcp_hashinfo; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 96 | EXPORT_SYMBOL(tcp_hashinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Octavian Purdila | 936b8bd | 2014-06-25 17:09:57 +0300 | [diff] [blame] | 98 | static __u32 tcp_v4_init_sequence(const struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 100 | return secure_tcp_sequence_number(ip_hdr(skb)->daddr, |
| 101 | ip_hdr(skb)->saddr, |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 102 | tcp_hdr(skb)->dest, |
| 103 | tcp_hdr(skb)->source); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | } |
| 105 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 106 | int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp) |
| 107 | { |
| 108 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sktw); |
| 109 | struct tcp_sock *tp = tcp_sk(sk); |
| 110 | |
| 111 | /* With PAWS, it is safe from the viewpoint |
| 112 | of data integrity. Even without PAWS it is safe provided sequence |
| 113 | spaces do not overlap i.e. at data rates <= 80Mbit/sec. |
| 114 | |
| 115 | Actually, the idea is close to VJ's one, only timestamp cache is |
| 116 | held not per host, but per port pair and TW bucket is used as state |
| 117 | holder. |
| 118 | |
| 119 | If TW bucket has been already destroyed we fall back to VJ's scheme |
| 120 | and use initial timestamp retrieved from peer table. |
| 121 | */ |
| 122 | if (tcptw->tw_ts_recent_stamp && |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 123 | (!twp || (sysctl_tcp_tw_reuse && |
James Morris | 9d729f7 | 2007-03-04 16:12:44 -0800 | [diff] [blame] | 124 | get_seconds() - tcptw->tw_ts_recent_stamp > 1))) { |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 125 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; |
| 126 | if (tp->write_seq == 0) |
| 127 | tp->write_seq = 1; |
| 128 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; |
| 129 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; |
| 130 | sock_hold(sktw); |
| 131 | return 1; |
| 132 | } |
| 133 | |
| 134 | return 0; |
| 135 | } |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 136 | EXPORT_SYMBOL_GPL(tcp_twsk_unique); |
| 137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | /* This will initiate an outgoing connection. */ |
| 139 | int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
| 140 | { |
David S. Miller | 2d7192d | 2011-04-26 13:28:44 -0700 | [diff] [blame] | 141 | struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | struct inet_sock *inet = inet_sk(sk); |
| 143 | struct tcp_sock *tp = tcp_sk(sk); |
David S. Miller | dca8b08 | 2011-02-24 13:38:12 -0800 | [diff] [blame] | 144 | __be16 orig_sport, orig_dport; |
Al Viro | bada8ad | 2006-09-26 21:27:15 -0700 | [diff] [blame] | 145 | __be32 daddr, nexthop; |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 146 | struct flowi4 *fl4; |
David S. Miller | 2d7192d | 2011-04-26 13:28:44 -0700 | [diff] [blame] | 147 | struct rtable *rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | int err; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 149 | struct ip_options_rcu *inet_opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
| 151 | if (addr_len < sizeof(struct sockaddr_in)) |
| 152 | return -EINVAL; |
| 153 | |
| 154 | if (usin->sin_family != AF_INET) |
| 155 | return -EAFNOSUPPORT; |
| 156 | |
| 157 | nexthop = daddr = usin->sin_addr.s_addr; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 158 | inet_opt = rcu_dereference_protected(inet->inet_opt, |
Hannes Frederic Sowa | 1e1d04e | 2016-04-05 17:10:15 +0200 | [diff] [blame] | 159 | lockdep_sock_is_held(sk)); |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 160 | if (inet_opt && inet_opt->opt.srr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | if (!daddr) |
| 162 | return -EINVAL; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 163 | nexthop = inet_opt->opt.faddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
| 165 | |
David S. Miller | dca8b08 | 2011-02-24 13:38:12 -0800 | [diff] [blame] | 166 | orig_sport = inet->inet_sport; |
| 167 | orig_dport = usin->sin_port; |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 168 | fl4 = &inet->cork.fl.u.ip4; |
| 169 | rt = ip_route_connect(fl4, nexthop, inet->inet_saddr, |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 170 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, |
| 171 | IPPROTO_TCP, |
Steffen Klassert | 0e0d44a | 2013-08-28 08:04:14 +0200 | [diff] [blame] | 172 | orig_sport, orig_dport, sk); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 173 | if (IS_ERR(rt)) { |
| 174 | err = PTR_ERR(rt); |
| 175 | if (err == -ENETUNREACH) |
Eric Dumazet | f1d8cba | 2013-11-28 09:51:22 -0800 | [diff] [blame] | 176 | IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 177 | return err; |
Wei Dong | 584bdf8 | 2007-05-31 22:49:28 -0700 | [diff] [blame] | 178 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
| 180 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { |
| 181 | ip_rt_put(rt); |
| 182 | return -ENETUNREACH; |
| 183 | } |
| 184 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 185 | if (!inet_opt || !inet_opt->opt.srr) |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 186 | daddr = fl4->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 188 | if (!inet->inet_saddr) |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 189 | inet->inet_saddr = fl4->saddr; |
Eric Dumazet | d1e559d | 2015-03-18 14:05:35 -0700 | [diff] [blame] | 190 | sk_rcv_saddr_set(sk, inet->inet_saddr); |
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 (tp->rx_opt.ts_recent_stamp && inet->inet_daddr != daddr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | /* Reset inherited state */ |
| 194 | tp->rx_opt.ts_recent = 0; |
| 195 | tp->rx_opt.ts_recent_stamp = 0; |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 196 | if (likely(!tp->repair)) |
| 197 | tp->write_seq = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | } |
| 199 | |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 200 | if (tcp_death_row.sysctl_tw_recycle && |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 201 | !tp->rx_opt.ts_recent_stamp && fl4->daddr == daddr) |
| 202 | tcp_fetch_timewait_stamp(sk, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 204 | inet->inet_dport = usin->sin_port; |
Eric Dumazet | d1e559d | 2015-03-18 14:05:35 -0700 | [diff] [blame] | 205 | sk_daddr_set(sk, daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 207 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 208 | if (inet_opt) |
| 209 | inet_csk(sk)->icsk_ext_hdr_len = inet_opt->opt.optlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | |
William Allen Simpson | bee7ca9 | 2009-11-10 09:51:18 +0000 | [diff] [blame] | 211 | tp->rx_opt.mss_clamp = TCP_MSS_DEFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
| 213 | /* Socket identity is still unknown (sport may be zero). |
| 214 | * However we set state to SYN-SENT and not releasing socket |
| 215 | * lock select source port, enter ourselves into the hash tables and |
| 216 | * complete initialization after this. |
| 217 | */ |
| 218 | tcp_set_state(sk, TCP_SYN_SENT); |
Arnaldo Carvalho de Melo | a7f5e7f | 2005-12-13 23:25:31 -0800 | [diff] [blame] | 219 | err = inet_hash_connect(&tcp_death_row, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | if (err) |
| 221 | goto failure; |
| 222 | |
Tom Herbert | 877d1f6 | 2015-07-28 16:02:05 -0700 | [diff] [blame] | 223 | sk_set_txhash(sk); |
Sathya Perla | 9e7ceb0 | 2014-10-22 21:42:01 +0530 | [diff] [blame] | 224 | |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 225 | rt = ip_route_newports(fl4, rt, orig_sport, orig_dport, |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 226 | inet->inet_sport, inet->inet_dport, sk); |
| 227 | if (IS_ERR(rt)) { |
| 228 | err = PTR_ERR(rt); |
| 229 | rt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | goto failure; |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 231 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | /* OK, now commit destination to socket. */ |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 233 | sk->sk_gso_type = SKB_GSO_TCPV4; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 234 | sk_setup_caps(sk, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 236 | if (!tp->write_seq && likely(!tp->repair)) |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 237 | tp->write_seq = secure_tcp_sequence_number(inet->inet_saddr, |
| 238 | inet->inet_daddr, |
| 239 | inet->inet_sport, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | usin->sin_port); |
| 241 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 242 | inet->inet_id = tp->write_seq ^ jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
Andrey Vagin | 2b91647 | 2012-11-22 01:13:58 +0000 | [diff] [blame] | 244 | err = tcp_connect(sk); |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 245 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | rt = NULL; |
| 247 | if (err) |
| 248 | goto failure; |
| 249 | |
| 250 | return 0; |
| 251 | |
| 252 | failure: |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 253 | /* |
| 254 | * This unhashes the socket and releases the local port, |
| 255 | * if necessary. |
| 256 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | tcp_set_state(sk, TCP_CLOSE); |
| 258 | ip_rt_put(rt); |
| 259 | sk->sk_route_caps = 0; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 260 | inet->inet_dport = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | return err; |
| 262 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 263 | EXPORT_SYMBOL(tcp_v4_connect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | /* |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 266 | * This routine reacts to ICMP_FRAG_NEEDED mtu indications as defined in RFC1191. |
| 267 | * It can be called through tcp_release_cb() if socket was owned by user |
| 268 | * at the time tcp_v4_err() was called to handle ICMP message. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | */ |
Neal Cardwell | 4fab907 | 2014-08-14 12:40:05 -0400 | [diff] [blame] | 270 | void tcp_v4_mtu_reduced(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | { |
| 272 | struct dst_entry *dst; |
| 273 | struct inet_sock *inet = inet_sk(sk); |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 274 | u32 mtu = tcp_sk(sk)->mtu_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
David S. Miller | 80d0a69 | 2012-07-16 03:28:06 -0700 | [diff] [blame] | 276 | dst = inet_csk_update_pmtu(sk, mtu); |
| 277 | if (!dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | return; |
| 279 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | /* Something is about to be wrong... Remember soft error |
| 281 | * for the case, if this connection will not able to recover. |
| 282 | */ |
| 283 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) |
| 284 | sk->sk_err_soft = EMSGSIZE; |
| 285 | |
| 286 | mtu = dst_mtu(dst); |
| 287 | |
| 288 | if (inet->pmtudisc != IP_PMTUDISC_DONT && |
Hannes Frederic Sowa | 482fc60 | 2013-11-05 02:24:17 +0100 | [diff] [blame] | 289 | ip_sk_accept_pmtu(sk) && |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 290 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | tcp_sync_mss(sk, mtu); |
| 292 | |
| 293 | /* Resend the TCP packet because it's |
| 294 | * clear that the old packet has been |
| 295 | * dropped. This is the new "fast" path mtu |
| 296 | * discovery. |
| 297 | */ |
| 298 | tcp_simple_retransmit(sk); |
| 299 | } /* else let the usual retransmit timer handle it */ |
| 300 | } |
Neal Cardwell | 4fab907 | 2014-08-14 12:40:05 -0400 | [diff] [blame] | 301 | EXPORT_SYMBOL(tcp_v4_mtu_reduced); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 303 | static void do_redirect(struct sk_buff *skb, struct sock *sk) |
| 304 | { |
| 305 | struct dst_entry *dst = __sk_dst_check(sk, 0); |
| 306 | |
David S. Miller | 1ed5c48 | 2012-07-12 00:41:25 -0700 | [diff] [blame] | 307 | if (dst) |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 308 | dst->ops->redirect(dst, sk, skb); |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 309 | } |
| 310 | |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 311 | |
| 312 | /* handle ICMP messages on TCP_NEW_SYN_RECV request sockets */ |
Eric Dumazet | 9cf7490 | 2016-02-02 19:31:12 -0800 | [diff] [blame] | 313 | void tcp_req_err(struct sock *sk, u32 seq, bool abort) |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 314 | { |
| 315 | struct request_sock *req = inet_reqsk(sk); |
| 316 | struct net *net = sock_net(sk); |
| 317 | |
| 318 | /* ICMPs are not backlogged, hence we cannot get |
| 319 | * an established socket here. |
| 320 | */ |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 321 | if (seq != tcp_rsk(req)->snt_isn) { |
Eric Dumazet | 02a1d6e | 2016-04-27 16:44:39 -0700 | [diff] [blame] | 322 | __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
Eric Dumazet | 9cf7490 | 2016-02-02 19:31:12 -0800 | [diff] [blame] | 323 | } else if (abort) { |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 324 | /* |
| 325 | * Still in SYN_RECV, just remove it silently. |
| 326 | * There is no good way to pass the error to the newly |
| 327 | * created socket, and POSIX does not want network |
| 328 | * errors returned from accept(). |
| 329 | */ |
Fan Du | c697366 | 2015-03-23 15:00:41 -0700 | [diff] [blame] | 330 | inet_csk_reqsk_queue_drop(req->rsk_listener, req); |
Eric Dumazet | 9caad86 | 2016-04-01 08:52:20 -0700 | [diff] [blame] | 331 | tcp_listendrop(req->rsk_listener); |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 332 | } |
Eric Dumazet | ef84d8c | 2015-10-14 11:16:26 -0700 | [diff] [blame] | 333 | reqsk_put(req); |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 334 | } |
| 335 | EXPORT_SYMBOL(tcp_req_err); |
| 336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | /* |
| 338 | * This routine is called by the ICMP module when it gets some |
| 339 | * sort of error condition. If err < 0 then the socket should |
| 340 | * be closed and the error returned to the user. If err > 0 |
| 341 | * it's just the icmp type << 8 | icmp code. After adjustment |
| 342 | * header points to the first 8 bytes of the tcp header. We need |
| 343 | * to find the appropriate port. |
| 344 | * |
| 345 | * The locking strategy used here is very "optimistic". When |
| 346 | * someone else accesses the socket the ICMP is just dropped |
| 347 | * and for some paths there is no check at all. |
| 348 | * A more general error queue to queue errors for later handling |
| 349 | * is probably better. |
| 350 | * |
| 351 | */ |
| 352 | |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 353 | void tcp_v4_err(struct sk_buff *icmp_skb, u32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 355 | const struct iphdr *iph = (const struct iphdr *)icmp_skb->data; |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 356 | struct tcphdr *th = (struct tcphdr *)(icmp_skb->data + (iph->ihl << 2)); |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 357 | struct inet_connection_sock *icsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | struct tcp_sock *tp; |
| 359 | struct inet_sock *inet; |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 360 | const int type = icmp_hdr(icmp_skb)->type; |
| 361 | const int code = icmp_hdr(icmp_skb)->code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | struct sock *sk; |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 363 | struct sk_buff *skb; |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 364 | struct request_sock *fastopen; |
| 365 | __u32 seq, snd_una; |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 366 | __u32 remaining; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | int err; |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 368 | struct net *net = dev_net(icmp_skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 370 | sk = __inet_lookup_established(net, &tcp_hashinfo, iph->daddr, |
| 371 | th->dest, iph->saddr, ntohs(th->source), |
| 372 | inet_iif(icmp_skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | if (!sk) { |
Eric Dumazet | 5d3848b | 2016-04-27 16:44:29 -0700 | [diff] [blame] | 374 | __ICMP_INC_STATS(net, ICMP_MIB_INERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | return; |
| 376 | } |
| 377 | if (sk->sk_state == TCP_TIME_WAIT) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 378 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | return; |
| 380 | } |
Eric Dumazet | 26e3736 | 2015-03-22 10:22:22 -0700 | [diff] [blame] | 381 | seq = ntohl(th->seq); |
| 382 | if (sk->sk_state == TCP_NEW_SYN_RECV) |
Eric Dumazet | 9cf7490 | 2016-02-02 19:31:12 -0800 | [diff] [blame] | 383 | return tcp_req_err(sk, seq, |
| 384 | type == ICMP_PARAMETERPROB || |
| 385 | type == ICMP_TIME_EXCEEDED || |
| 386 | (type == ICMP_DEST_UNREACH && |
| 387 | (code == ICMP_NET_UNREACH || |
| 388 | code == ICMP_HOST_UNREACH))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | |
| 390 | bh_lock_sock(sk); |
| 391 | /* If too many ICMPs get dropped on busy |
| 392 | * servers this needs to be solved differently. |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 393 | * We do take care of PMTU discovery (RFC1191) special case : |
| 394 | * we can receive locally generated ICMP messages while socket is held. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | */ |
Eric Dumazet | b74aa93 | 2013-01-19 16:10:37 +0000 | [diff] [blame] | 396 | if (sock_owned_by_user(sk)) { |
| 397 | if (!(type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)) |
Eric Dumazet | 02a1d6e | 2016-04-27 16:44:39 -0700 | [diff] [blame] | 398 | __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); |
Eric Dumazet | b74aa93 | 2013-01-19 16:10:37 +0000 | [diff] [blame] | 399 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | if (sk->sk_state == TCP_CLOSE) |
| 401 | goto out; |
| 402 | |
stephen hemminger | 97e3ecd1 | 2010-03-18 11:27:32 +0000 | [diff] [blame] | 403 | if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { |
Eric Dumazet | 02a1d6e | 2016-04-27 16:44:39 -0700 | [diff] [blame] | 404 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
stephen hemminger | 97e3ecd1 | 2010-03-18 11:27:32 +0000 | [diff] [blame] | 405 | goto out; |
| 406 | } |
| 407 | |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 408 | icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | tp = tcp_sk(sk); |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 410 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
| 411 | fastopen = tp->fastopen_rsk; |
| 412 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | if (sk->sk_state != TCP_LISTEN && |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 414 | !between(seq, snd_una, tp->snd_nxt)) { |
Eric Dumazet | 02a1d6e | 2016-04-27 16:44:39 -0700 | [diff] [blame] | 415 | __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | goto out; |
| 417 | } |
| 418 | |
| 419 | switch (type) { |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 420 | case ICMP_REDIRECT: |
| 421 | do_redirect(icmp_skb, sk); |
| 422 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | case ICMP_SOURCE_QUENCH: |
| 424 | /* Just silently ignore these. */ |
| 425 | goto out; |
| 426 | case ICMP_PARAMETERPROB: |
| 427 | err = EPROTO; |
| 428 | break; |
| 429 | case ICMP_DEST_UNREACH: |
| 430 | if (code > NR_ICMP_UNREACH) |
| 431 | goto out; |
| 432 | |
| 433 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ |
Eric Dumazet | 0d4f060 | 2013-03-18 07:01:28 +0000 | [diff] [blame] | 434 | /* We are not interested in TCP_LISTEN and open_requests |
| 435 | * (SYN-ACKs send out by Linux are always <576bytes so |
| 436 | * they should go through unfragmented). |
| 437 | */ |
| 438 | if (sk->sk_state == TCP_LISTEN) |
| 439 | goto out; |
| 440 | |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 441 | tp->mtu_info = info; |
Eric Dumazet | 144d56e | 2012-08-20 00:22:46 +0000 | [diff] [blame] | 442 | if (!sock_owned_by_user(sk)) { |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 443 | tcp_v4_mtu_reduced(sk); |
Eric Dumazet | 144d56e | 2012-08-20 00:22:46 +0000 | [diff] [blame] | 444 | } else { |
| 445 | if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, &tp->tsq_flags)) |
| 446 | sock_hold(sk); |
| 447 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | goto out; |
| 449 | } |
| 450 | |
| 451 | err = icmp_err_convert[code].errno; |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 452 | /* check if icmp_skb allows revert of backoff |
| 453 | * (see draft-zimmermann-tcp-lcd) */ |
| 454 | if (code != ICMP_NET_UNREACH && code != ICMP_HOST_UNREACH) |
| 455 | break; |
| 456 | if (seq != tp->snd_una || !icsk->icsk_retransmits || |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 457 | !icsk->icsk_backoff || fastopen) |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 458 | break; |
| 459 | |
David S. Miller | 8f49c27 | 2010-11-12 13:35:00 -0800 | [diff] [blame] | 460 | if (sock_owned_by_user(sk)) |
| 461 | break; |
| 462 | |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 463 | icsk->icsk_backoff--; |
Eric Dumazet | fcdd1cf | 2014-09-22 13:19:44 -0700 | [diff] [blame] | 464 | icsk->icsk_rto = tp->srtt_us ? __tcp_set_rto(tp) : |
| 465 | TCP_TIMEOUT_INIT; |
| 466 | icsk->icsk_rto = inet_csk_rto_backoff(icsk, TCP_RTO_MAX); |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 467 | |
| 468 | skb = tcp_write_queue_head(sk); |
| 469 | BUG_ON(!skb); |
| 470 | |
Eric Dumazet | 7faee5c | 2014-09-05 15:33:33 -0700 | [diff] [blame] | 471 | remaining = icsk->icsk_rto - |
| 472 | min(icsk->icsk_rto, |
| 473 | tcp_time_stamp - tcp_skb_timestamp(skb)); |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 474 | |
| 475 | if (remaining) { |
| 476 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, |
| 477 | remaining, TCP_RTO_MAX); |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 478 | } else { |
| 479 | /* RTO revert clocked out retransmission. |
| 480 | * Will retransmit now */ |
| 481 | tcp_retransmit_timer(sk); |
| 482 | } |
| 483 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | break; |
| 485 | case ICMP_TIME_EXCEEDED: |
| 486 | err = EHOSTUNREACH; |
| 487 | break; |
| 488 | default: |
| 489 | goto out; |
| 490 | } |
| 491 | |
| 492 | switch (sk->sk_state) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | case TCP_SYN_SENT: |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 494 | case TCP_SYN_RECV: |
| 495 | /* Only in fast or simultaneous open. If a fast open socket is |
| 496 | * is already accepted it is treated as a connected one below. |
| 497 | */ |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 498 | if (fastopen && !fastopen->sk) |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 499 | break; |
| 500 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | if (!sock_owned_by_user(sk)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | sk->sk_err = err; |
| 503 | |
| 504 | sk->sk_error_report(sk); |
| 505 | |
| 506 | tcp_done(sk); |
| 507 | } else { |
| 508 | sk->sk_err_soft = err; |
| 509 | } |
| 510 | goto out; |
| 511 | } |
| 512 | |
| 513 | /* If we've already connected we will keep trying |
| 514 | * until we time out, or the user gives up. |
| 515 | * |
| 516 | * rfc1122 4.2.3.9 allows to consider as hard errors |
| 517 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, |
| 518 | * but it is obsoleted by pmtu discovery). |
| 519 | * |
| 520 | * Note, that in modern internet, where routing is unreliable |
| 521 | * and in each dark corner broken firewalls sit, sending random |
| 522 | * errors ordered by their masters even this two messages finally lose |
| 523 | * their original sense (even Linux sends invalid PORT_UNREACHs) |
| 524 | * |
| 525 | * Now we are in compliance with RFCs. |
| 526 | * --ANK (980905) |
| 527 | */ |
| 528 | |
| 529 | inet = inet_sk(sk); |
| 530 | if (!sock_owned_by_user(sk) && inet->recverr) { |
| 531 | sk->sk_err = err; |
| 532 | sk->sk_error_report(sk); |
| 533 | } else { /* Only an error on timeout */ |
| 534 | sk->sk_err_soft = err; |
| 535 | } |
| 536 | |
| 537 | out: |
| 538 | bh_unlock_sock(sk); |
| 539 | sock_put(sk); |
| 540 | } |
| 541 | |
Daniel Borkmann | 28850dc | 2013-06-07 05:11:46 +0000 | [diff] [blame] | 542 | 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] | 543 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 544 | struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 546 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 547 | th->check = ~tcp_v4_check(skb->len, saddr, daddr, 0); |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 548 | skb->csum_start = skb_transport_header(skb) - skb->head; |
Al Viro | ff1dcad | 2006-11-20 18:07:29 -0800 | [diff] [blame] | 549 | skb->csum_offset = offsetof(struct tcphdr, check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | } else { |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 551 | th->check = tcp_v4_check(skb->len, saddr, daddr, |
Joe Perches | 07f0757 | 2008-11-19 15:44:53 -0800 | [diff] [blame] | 552 | csum_partial(th, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | th->doff << 2, |
| 554 | skb->csum)); |
| 555 | } |
| 556 | } |
| 557 | |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 558 | /* This routine computes an IPv4 TCP checksum. */ |
Herbert Xu | bb29624 | 2010-04-11 02:15:55 +0000 | [diff] [blame] | 559 | void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb) |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 560 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 561 | const struct inet_sock *inet = inet_sk(sk); |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 562 | |
| 563 | __tcp_v4_send_check(skb, inet->inet_saddr, inet->inet_daddr); |
| 564 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 565 | EXPORT_SYMBOL(tcp_v4_send_check); |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 566 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | /* |
| 568 | * This routine will send an RST to the other tcp. |
| 569 | * |
| 570 | * Someone asks: why I NEVER use socket parameters (TOS, TTL etc.) |
| 571 | * for reset. |
| 572 | * Answer: if a packet caused RST, it is not for a socket |
| 573 | * existing in our system, if it is matched to a socket, |
| 574 | * it is just duplicate segment or bug in other side's TCP. |
| 575 | * So that we build reply only basing on parameters |
| 576 | * arrived with segment. |
| 577 | * Exception: precedence violation. We do not implement it in any case. |
| 578 | */ |
| 579 | |
Eric Dumazet | a00e744 | 2015-09-29 07:42:39 -0700 | [diff] [blame] | 580 | static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 582 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 583 | struct { |
| 584 | struct tcphdr th; |
| 585 | #ifdef CONFIG_TCP_MD5SIG |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 586 | __be32 opt[(TCPOLEN_MD5SIG_ALIGNED >> 2)]; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 587 | #endif |
| 588 | } rep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | struct ip_reply_arg arg; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 590 | #ifdef CONFIG_TCP_MD5SIG |
Florian Westphal | e46787f | 2015-12-21 21:29:25 +0100 | [diff] [blame] | 591 | struct tcp_md5sig_key *key = NULL; |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 592 | const __u8 *hash_location = NULL; |
| 593 | unsigned char newhash[16]; |
| 594 | int genhash; |
| 595 | struct sock *sk1 = NULL; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 596 | #endif |
Pavel Emelyanov | a86b1e3 | 2008-07-16 20:20:58 -0700 | [diff] [blame] | 597 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | |
| 599 | /* Never send a reset in response to a reset. */ |
| 600 | if (th->rst) |
| 601 | return; |
| 602 | |
Eric Dumazet | c3658e8 | 2014-11-25 07:40:04 -0800 | [diff] [blame] | 603 | /* If sk not NULL, it means we did a successful lookup and incoming |
| 604 | * route had to be correct. prequeue might have dropped our dst. |
| 605 | */ |
| 606 | if (!sk && skb_rtable(skb)->rt_type != RTN_LOCAL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | return; |
| 608 | |
| 609 | /* Swap the send and the receive. */ |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 610 | memset(&rep, 0, sizeof(rep)); |
| 611 | rep.th.dest = th->source; |
| 612 | rep.th.source = th->dest; |
| 613 | rep.th.doff = sizeof(struct tcphdr) / 4; |
| 614 | rep.th.rst = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | |
| 616 | if (th->ack) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 617 | rep.th.seq = th->ack_seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 619 | rep.th.ack = 1; |
| 620 | rep.th.ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin + |
| 621 | skb->len - (th->doff << 2)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | } |
| 623 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 624 | memset(&arg, 0, sizeof(arg)); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 625 | arg.iov[0].iov_base = (unsigned char *)&rep; |
| 626 | arg.iov[0].iov_len = sizeof(rep.th); |
| 627 | |
Eric Dumazet | 0f85fea | 2014-12-09 09:56:08 -0800 | [diff] [blame] | 628 | net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 629 | #ifdef CONFIG_TCP_MD5SIG |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 630 | rcu_read_lock(); |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 631 | hash_location = tcp_parse_md5sig_option(th); |
Florian Westphal | 271c3b9 | 2015-12-21 21:29:26 +0100 | [diff] [blame] | 632 | if (sk && sk_fullsock(sk)) { |
Florian Westphal | e46787f | 2015-12-21 21:29:25 +0100 | [diff] [blame] | 633 | key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *) |
| 634 | &ip_hdr(skb)->saddr, AF_INET); |
| 635 | } else if (hash_location) { |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 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 | */ |
Craig Gallek | a583636 | 2016-02-10 11:50:38 -0500 | [diff] [blame] | 643 | sk1 = __inet_lookup_listener(net, &tcp_hashinfo, NULL, 0, |
| 644 | ip_hdr(skb)->saddr, |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 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) |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 649 | goto out; |
| 650 | |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 651 | key = tcp_md5_do_lookup(sk1, (union tcp_md5_addr *) |
| 652 | &ip_hdr(skb)->saddr, AF_INET); |
| 653 | if (!key) |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 654 | goto out; |
| 655 | |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 656 | |
Eric Dumazet | 39f8e58 | 2015-03-24 15:58:55 -0700 | [diff] [blame] | 657 | genhash = tcp_v4_md5_hash_skb(newhash, key, NULL, skb); |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 658 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 659 | goto out; |
| 660 | |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 661 | } |
| 662 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 663 | if (key) { |
| 664 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | |
| 665 | (TCPOPT_NOP << 16) | |
| 666 | (TCPOPT_MD5SIG << 8) | |
| 667 | TCPOLEN_MD5SIG); |
| 668 | /* Update length and the length the header thinks exists */ |
| 669 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; |
| 670 | rep.th.doff = arg.iov[0].iov_len / 4; |
| 671 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 672 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[1], |
Ilpo Järvinen | 78e645cb | 2008-10-09 14:37:47 -0700 | [diff] [blame] | 673 | key, ip_hdr(skb)->saddr, |
| 674 | ip_hdr(skb)->daddr, &rep.th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 675 | } |
| 676 | #endif |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 677 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
| 678 | ip_hdr(skb)->saddr, /* XXX */ |
Ilpo Järvinen | 52cd575 | 2008-10-08 11:34:06 -0700 | [diff] [blame] | 679 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; |
Florian Westphal | 271c3b9 | 2015-12-21 21:29:26 +0100 | [diff] [blame] | 681 | arg.flags = (sk && inet_sk_transparent(sk)) ? IP_REPLY_ARG_NOSRCCHECK : 0; |
| 682 | |
Shawn Lu | e2446ea | 2012-02-04 12:38:09 +0000 | [diff] [blame] | 683 | /* When socket is gone, all binding information is lost. |
Alexey Kuznetsov | 4c67525 | 2012-10-12 04:34:17 +0000 | [diff] [blame] | 684 | * routing might fail in this case. No choice here, if we choose to force |
| 685 | * input interface, we will misroute in case of asymmetric route. |
Shawn Lu | e2446ea | 2012-02-04 12:38:09 +0000 | [diff] [blame] | 686 | */ |
Alexey Kuznetsov | 4c67525 | 2012-10-12 04:34:17 +0000 | [diff] [blame] | 687 | if (sk) |
| 688 | arg.bound_dev_if = sk->sk_bound_dev_if; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | |
Florian Westphal | 271c3b9 | 2015-12-21 21:29:26 +0100 | [diff] [blame] | 690 | BUILD_BUG_ON(offsetof(struct sock, sk_bound_dev_if) != |
| 691 | offsetof(struct inet_timewait_sock, tw_bound_dev_if)); |
| 692 | |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 693 | arg.tos = ip_hdr(skb)->tos; |
Eric Dumazet | 47dcc20 | 2016-05-06 09:46:18 -0700 | [diff] [blame] | 694 | local_bh_disable(); |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 695 | ip_send_unicast_reply(*this_cpu_ptr(net->ipv4.tcp_sk), |
| 696 | skb, &TCP_SKB_CB(skb)->header.h4.opt, |
Eric Dumazet | 24a2d43 | 2014-09-27 09:50:55 -0700 | [diff] [blame] | 697 | ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, |
| 698 | &arg, arg.iov[0].iov_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | |
Eric Dumazet | 90bbcc6 | 2016-04-27 16:44:32 -0700 | [diff] [blame] | 700 | __TCP_INC_STATS(net, TCP_MIB_OUTSEGS); |
| 701 | __TCP_INC_STATS(net, TCP_MIB_OUTRSTS); |
Eric Dumazet | 47dcc20 | 2016-05-06 09:46:18 -0700 | [diff] [blame] | 702 | local_bh_enable(); |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 703 | |
| 704 | #ifdef CONFIG_TCP_MD5SIG |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 705 | out: |
| 706 | rcu_read_unlock(); |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 707 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | } |
| 709 | |
| 710 | /* The code following below sending ACKs in SYN-RECV and TIME-WAIT states |
| 711 | outside socket context is ugly, certainly. What can I do? |
| 712 | */ |
| 713 | |
Eric Dumazet | e62a123 | 2016-01-21 08:02:54 -0800 | [diff] [blame] | 714 | static void tcp_v4_send_ack(struct net *net, |
| 715 | struct sk_buff *skb, u32 seq, u32 ack, |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 716 | u32 win, u32 tsval, u32 tsecr, int oif, |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 717 | struct tcp_md5sig_key *key, |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 718 | int reply_flags, u8 tos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 720 | const struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | struct { |
| 722 | struct tcphdr th; |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 723 | __be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 724 | #ifdef CONFIG_TCP_MD5SIG |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 725 | + (TCPOLEN_MD5SIG_ALIGNED >> 2) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 726 | #endif |
| 727 | ]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | } rep; |
| 729 | struct ip_reply_arg arg; |
| 730 | |
| 731 | memset(&rep.th, 0, sizeof(struct tcphdr)); |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 732 | memset(&arg, 0, sizeof(arg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | |
| 734 | arg.iov[0].iov_base = (unsigned char *)&rep; |
| 735 | arg.iov[0].iov_len = sizeof(rep.th); |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 736 | if (tsecr) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 737 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| 738 | (TCPOPT_TIMESTAMP << 8) | |
| 739 | TCPOLEN_TIMESTAMP); |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 740 | rep.opt[1] = htonl(tsval); |
| 741 | rep.opt[2] = htonl(tsecr); |
Craig Schlenter | cb48cfe | 2007-01-09 00:11:15 -0800 | [diff] [blame] | 742 | arg.iov[0].iov_len += TCPOLEN_TSTAMP_ALIGNED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | } |
| 744 | |
| 745 | /* Swap the send and the receive. */ |
| 746 | rep.th.dest = th->source; |
| 747 | rep.th.source = th->dest; |
| 748 | rep.th.doff = arg.iov[0].iov_len / 4; |
| 749 | rep.th.seq = htonl(seq); |
| 750 | rep.th.ack_seq = htonl(ack); |
| 751 | rep.th.ack = 1; |
| 752 | rep.th.window = htons(win); |
| 753 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 754 | #ifdef CONFIG_TCP_MD5SIG |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 755 | if (key) { |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 756 | int offset = (tsecr) ? 3 : 0; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 757 | |
| 758 | rep.opt[offset++] = htonl((TCPOPT_NOP << 24) | |
| 759 | (TCPOPT_NOP << 16) | |
| 760 | (TCPOPT_MD5SIG << 8) | |
| 761 | TCPOLEN_MD5SIG); |
| 762 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; |
| 763 | rep.th.doff = arg.iov[0].iov_len/4; |
| 764 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 765 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[offset], |
Adam Langley | 90b7e11 | 2008-07-31 20:49:48 -0700 | [diff] [blame] | 766 | key, ip_hdr(skb)->saddr, |
| 767 | ip_hdr(skb)->daddr, &rep.th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 768 | } |
| 769 | #endif |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 770 | arg.flags = reply_flags; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 771 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
| 772 | ip_hdr(skb)->saddr, /* XXX */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
| 774 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 775 | if (oif) |
| 776 | arg.bound_dev_if = oif; |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 777 | arg.tos = tos; |
Eric Dumazet | 47dcc20 | 2016-05-06 09:46:18 -0700 | [diff] [blame] | 778 | local_bh_disable(); |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 779 | ip_send_unicast_reply(*this_cpu_ptr(net->ipv4.tcp_sk), |
| 780 | skb, &TCP_SKB_CB(skb)->header.h4.opt, |
Eric Dumazet | 24a2d43 | 2014-09-27 09:50:55 -0700 | [diff] [blame] | 781 | ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, |
| 782 | &arg, arg.iov[0].iov_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | |
Eric Dumazet | 90bbcc6 | 2016-04-27 16:44:32 -0700 | [diff] [blame] | 784 | __TCP_INC_STATS(net, TCP_MIB_OUTSEGS); |
Eric Dumazet | 47dcc20 | 2016-05-06 09:46:18 -0700 | [diff] [blame] | 785 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | } |
| 787 | |
| 788 | static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) |
| 789 | { |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 790 | struct inet_timewait_sock *tw = inet_twsk(sk); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 791 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | |
Eric Dumazet | e62a123 | 2016-01-21 08:02:54 -0800 | [diff] [blame] | 793 | tcp_v4_send_ack(sock_net(sk), skb, |
| 794 | tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 795 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 796 | tcp_time_stamp + tcptw->tw_ts_offset, |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 797 | tcptw->tw_ts_recent, |
| 798 | tw->tw_bound_dev_if, |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 799 | tcp_twsk_md5_key(tcptw), |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 800 | tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0, |
| 801 | tw->tw_tos |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 802 | ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 804 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | } |
| 806 | |
Eric Dumazet | a00e744 | 2015-09-29 07:42:39 -0700 | [diff] [blame] | 807 | static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 808 | struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | { |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 810 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
| 811 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. |
| 812 | */ |
Eric Dumazet | e62a123 | 2016-01-21 08:02:54 -0800 | [diff] [blame] | 813 | u32 seq = (sk->sk_state == TCP_LISTEN) ? tcp_rsk(req)->snt_isn + 1 : |
| 814 | tcp_sk(sk)->snd_nxt; |
| 815 | |
Eric Dumazet | 20a2b49 | 2016-08-22 11:31:10 -0700 | [diff] [blame] | 816 | /* RFC 7323 2.3 |
| 817 | * The window field (SEG.WND) of every outgoing segment, with the |
| 818 | * exception of <SYN> segments, MUST be right-shifted by |
| 819 | * Rcv.Wind.Shift bits: |
| 820 | */ |
Eric Dumazet | e62a123 | 2016-01-21 08:02:54 -0800 | [diff] [blame] | 821 | tcp_v4_send_ack(sock_net(sk), skb, seq, |
Eric Dumazet | 20a2b49 | 2016-08-22 11:31:10 -0700 | [diff] [blame] | 822 | tcp_rsk(req)->rcv_nxt, |
| 823 | req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale, |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 824 | tcp_time_stamp, |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 825 | req->ts_recent, |
| 826 | 0, |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 827 | tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&ip_hdr(skb)->daddr, |
| 828 | AF_INET), |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 829 | inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0, |
| 830 | ip_hdr(skb)->tos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | } |
| 832 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | /* |
Kris Katterjohn | 9bf1d83 | 2008-02-17 22:29:19 -0800 | [diff] [blame] | 834 | * Send a SYN-ACK after having received a SYN. |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 835 | * This still operates on a request_sock only, not on a big |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | * socket. |
| 837 | */ |
Eric Dumazet | 0f935db | 2015-09-25 07:39:21 -0700 | [diff] [blame] | 838 | static int tcp_v4_send_synack(const struct sock *sk, struct dst_entry *dst, |
Octavian Purdila | d6274bd | 2014-06-25 17:09:58 +0300 | [diff] [blame] | 839 | struct flowi *fl, |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 840 | struct request_sock *req, |
Eric Dumazet | ca6fb06 | 2015-10-02 11:43:35 -0700 | [diff] [blame] | 841 | struct tcp_fastopen_cookie *foc, |
Eric Dumazet | b3d0514 | 2016-04-13 22:05:39 -0700 | [diff] [blame] | 842 | enum tcp_synack_type synack_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 844 | const struct inet_request_sock *ireq = inet_rsk(req); |
David S. Miller | 6bd023f | 2011-05-18 18:32:03 -0400 | [diff] [blame] | 845 | struct flowi4 fl4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | int err = -1; |
Weilong Chen | d41db5a | 2013-12-23 14:37:28 +0800 | [diff] [blame] | 847 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | |
| 849 | /* First, grab a route. */ |
David S. Miller | ba3f7f0 | 2012-07-17 14:02:46 -0700 | [diff] [blame] | 850 | if (!dst && (dst = inet_csk_route_req(sk, &fl4, req)) == NULL) |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 851 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | |
Eric Dumazet | b3d0514 | 2016-04-13 22:05:39 -0700 | [diff] [blame] | 853 | skb = tcp_make_synack(sk, dst, req, foc, synack_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | |
| 855 | if (skb) { |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 856 | __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] | 857 | |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 858 | err = ip_build_and_send_pkt(skb, sk, ireq->ir_loc_addr, |
| 859 | ireq->ir_rmt_addr, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 860 | ireq->opt); |
Gerrit Renker | b9df3cb | 2006-11-14 11:21:36 -0200 | [diff] [blame] | 861 | err = net_xmit_eval(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | } |
| 863 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | return err; |
| 865 | } |
| 866 | |
| 867 | /* |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 868 | * IPv4 request_sock destructor. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | */ |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 870 | static void tcp_v4_reqsk_destructor(struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | { |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 872 | kfree(inet_rsk(req)->opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | } |
| 874 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 875 | #ifdef CONFIG_TCP_MD5SIG |
| 876 | /* |
| 877 | * RFC2385 MD5 checksumming requires a mapping of |
| 878 | * IP address->MD5 Key. |
| 879 | * We need to maintain these in the sk structure. |
| 880 | */ |
| 881 | |
| 882 | /* Find the Key structure for an address. */ |
Eric Dumazet | b83e3de | 2015-09-25 07:39:15 -0700 | [diff] [blame] | 883 | struct tcp_md5sig_key *tcp_md5_do_lookup(const struct sock *sk, |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 884 | const union tcp_md5_addr *addr, |
| 885 | int family) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 886 | { |
Eric Dumazet | fd3a154 | 2015-03-24 15:58:56 -0700 | [diff] [blame] | 887 | const struct tcp_sock *tp = tcp_sk(sk); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 888 | struct tcp_md5sig_key *key; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 889 | unsigned int size = sizeof(struct in_addr); |
Eric Dumazet | fd3a154 | 2015-03-24 15:58:56 -0700 | [diff] [blame] | 890 | const struct tcp_md5sig_info *md5sig; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 891 | |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 892 | /* caller either holds rcu_read_lock() or socket lock */ |
| 893 | md5sig = rcu_dereference_check(tp->md5sig_info, |
Hannes Frederic Sowa | 1e1d04e | 2016-04-05 17:10:15 +0200 | [diff] [blame] | 894 | lockdep_sock_is_held(sk)); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 895 | if (!md5sig) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 896 | return NULL; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 897 | #if IS_ENABLED(CONFIG_IPV6) |
| 898 | if (family == AF_INET6) |
| 899 | size = sizeof(struct in6_addr); |
| 900 | #endif |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 901 | hlist_for_each_entry_rcu(key, &md5sig->head, node) { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 902 | if (key->family != family) |
| 903 | continue; |
| 904 | if (!memcmp(&key->addr, addr, size)) |
| 905 | return key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 906 | } |
| 907 | return NULL; |
| 908 | } |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 909 | EXPORT_SYMBOL(tcp_md5_do_lookup); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 910 | |
Eric Dumazet | b83e3de | 2015-09-25 07:39:15 -0700 | [diff] [blame] | 911 | struct tcp_md5sig_key *tcp_v4_md5_lookup(const struct sock *sk, |
Eric Dumazet | fd3a154 | 2015-03-24 15:58:56 -0700 | [diff] [blame] | 912 | const struct sock *addr_sk) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 913 | { |
Eric Dumazet | b52e692 | 2015-04-09 14:36:42 -0700 | [diff] [blame] | 914 | const union tcp_md5_addr *addr; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 915 | |
Eric Dumazet | b52e692 | 2015-04-09 14:36:42 -0700 | [diff] [blame] | 916 | addr = (const union tcp_md5_addr *)&addr_sk->sk_daddr; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 917 | return tcp_md5_do_lookup(sk, addr, AF_INET); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 918 | } |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 919 | EXPORT_SYMBOL(tcp_v4_md5_lookup); |
| 920 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 921 | /* This can be called on a newly created socket, from other files */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 922 | int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr, |
| 923 | int family, const u8 *newkey, u8 newkeylen, gfp_t gfp) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 924 | { |
| 925 | /* Add Key to the list */ |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 926 | struct tcp_md5sig_key *key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 927 | struct tcp_sock *tp = tcp_sk(sk); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 928 | struct tcp_md5sig_info *md5sig; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 929 | |
Aydin Arik | c0353c7 | 2013-06-14 18:56:31 +1200 | [diff] [blame] | 930 | key = tcp_md5_do_lookup(sk, addr, family); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 931 | if (key) { |
| 932 | /* Pre-existing entry - just update that one. */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 933 | memcpy(key->key, newkey, newkeylen); |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 934 | key->keylen = newkeylen; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 935 | return 0; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 936 | } |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 937 | |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 938 | md5sig = rcu_dereference_protected(tp->md5sig_info, |
Hannes Frederic Sowa | 1e1d04e | 2016-04-05 17:10:15 +0200 | [diff] [blame] | 939 | lockdep_sock_is_held(sk)); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 940 | if (!md5sig) { |
| 941 | md5sig = kmalloc(sizeof(*md5sig), gfp); |
| 942 | if (!md5sig) |
| 943 | return -ENOMEM; |
| 944 | |
| 945 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
| 946 | INIT_HLIST_HEAD(&md5sig->head); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 947 | rcu_assign_pointer(tp->md5sig_info, md5sig); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 948 | } |
| 949 | |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 950 | key = sock_kmalloc(sk, sizeof(*key), gfp); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 951 | if (!key) |
| 952 | return -ENOMEM; |
Eric Dumazet | 71cea17 | 2013-05-20 06:52:26 +0000 | [diff] [blame] | 953 | if (!tcp_alloc_md5sig_pool()) { |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 954 | sock_kfree_s(sk, key, sizeof(*key)); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 955 | return -ENOMEM; |
| 956 | } |
| 957 | |
| 958 | memcpy(key->key, newkey, newkeylen); |
| 959 | key->keylen = newkeylen; |
| 960 | key->family = family; |
| 961 | memcpy(&key->addr, addr, |
| 962 | (family == AF_INET6) ? sizeof(struct in6_addr) : |
| 963 | sizeof(struct in_addr)); |
| 964 | hlist_add_head_rcu(&key->node, &md5sig->head); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 965 | return 0; |
| 966 | } |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 967 | EXPORT_SYMBOL(tcp_md5_do_add); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 968 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 969 | 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] | 970 | { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 971 | struct tcp_md5sig_key *key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 972 | |
Aydin Arik | c0353c7 | 2013-06-14 18:56:31 +1200 | [diff] [blame] | 973 | key = tcp_md5_do_lookup(sk, addr, family); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 974 | if (!key) |
| 975 | return -ENOENT; |
| 976 | hlist_del_rcu(&key->node); |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 977 | atomic_sub(sizeof(*key), &sk->sk_omem_alloc); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 978 | kfree_rcu(key, rcu); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 979 | return 0; |
| 980 | } |
| 981 | EXPORT_SYMBOL(tcp_md5_do_del); |
| 982 | |
stephen hemminger | e0683e70 | 2012-10-26 14:31:40 +0000 | [diff] [blame] | 983 | static void tcp_clear_md5_list(struct sock *sk) |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 984 | { |
| 985 | struct tcp_sock *tp = tcp_sk(sk); |
| 986 | struct tcp_md5sig_key *key; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 987 | struct hlist_node *n; |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 988 | struct tcp_md5sig_info *md5sig; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 989 | |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 990 | md5sig = rcu_dereference_protected(tp->md5sig_info, 1); |
| 991 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 992 | hlist_for_each_entry_safe(key, n, &md5sig->head, node) { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 993 | hlist_del_rcu(&key->node); |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 994 | atomic_sub(sizeof(*key), &sk->sk_omem_alloc); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 995 | kfree_rcu(key, rcu); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 996 | } |
| 997 | } |
| 998 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 999 | static int tcp_v4_parse_md5_keys(struct sock *sk, char __user *optval, |
| 1000 | int optlen) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1001 | { |
| 1002 | struct tcp_md5sig cmd; |
| 1003 | struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1004 | |
| 1005 | if (optlen < sizeof(cmd)) |
| 1006 | return -EINVAL; |
| 1007 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1008 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1009 | return -EFAULT; |
| 1010 | |
| 1011 | if (sin->sin_family != AF_INET) |
| 1012 | return -EINVAL; |
| 1013 | |
Dmitry Popov | 64a124e | 2014-08-03 22:45:19 +0400 | [diff] [blame] | 1014 | if (!cmd.tcpm_keylen) |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1015 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr, |
| 1016 | AF_INET); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1017 | |
| 1018 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) |
| 1019 | return -EINVAL; |
| 1020 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1021 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr, |
| 1022 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, |
| 1023 | GFP_KERNEL); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1024 | } |
| 1025 | |
Eric Dumazet | 19689e3 | 2016-06-27 18:51:53 +0200 | [diff] [blame] | 1026 | static int tcp_v4_md5_hash_headers(struct tcp_md5sig_pool *hp, |
| 1027 | __be32 daddr, __be32 saddr, |
| 1028 | const struct tcphdr *th, int nbytes) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1029 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1030 | struct tcp4_pseudohdr *bp; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1031 | struct scatterlist sg; |
Eric Dumazet | 19689e3 | 2016-06-27 18:51:53 +0200 | [diff] [blame] | 1032 | struct tcphdr *_th; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1033 | |
Eric Dumazet | 19689e3 | 2016-06-27 18:51:53 +0200 | [diff] [blame] | 1034 | bp = hp->scratch; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1035 | bp->saddr = saddr; |
| 1036 | bp->daddr = daddr; |
| 1037 | bp->pad = 0; |
YOSHIFUJI Hideaki | 076fb72 | 2008-04-17 12:48:12 +0900 | [diff] [blame] | 1038 | bp->protocol = IPPROTO_TCP; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1039 | bp->len = cpu_to_be16(nbytes); |
David S. Miller | c7da57a | 2007-10-26 00:41:21 -0700 | [diff] [blame] | 1040 | |
Eric Dumazet | 19689e3 | 2016-06-27 18:51:53 +0200 | [diff] [blame] | 1041 | _th = (struct tcphdr *)(bp + 1); |
| 1042 | memcpy(_th, th, sizeof(*th)); |
| 1043 | _th->check = 0; |
| 1044 | |
| 1045 | sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th)); |
| 1046 | ahash_request_set_crypt(hp->md5_req, &sg, NULL, |
| 1047 | sizeof(*bp) + sizeof(*th)); |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1048 | return crypto_ahash_update(hp->md5_req); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1049 | } |
| 1050 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1051 | 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] | 1052 | __be32 daddr, __be32 saddr, const struct tcphdr *th) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1053 | { |
| 1054 | struct tcp_md5sig_pool *hp; |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1055 | struct ahash_request *req; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1056 | |
| 1057 | hp = tcp_get_md5sig_pool(); |
| 1058 | if (!hp) |
| 1059 | goto clear_hash_noput; |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1060 | req = hp->md5_req; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1061 | |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1062 | if (crypto_ahash_init(req)) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1063 | goto clear_hash; |
Eric Dumazet | 19689e3 | 2016-06-27 18:51:53 +0200 | [diff] [blame] | 1064 | if (tcp_v4_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2)) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1065 | goto clear_hash; |
| 1066 | if (tcp_md5_hash_key(hp, key)) |
| 1067 | goto clear_hash; |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1068 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
| 1069 | if (crypto_ahash_final(req)) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1070 | goto clear_hash; |
| 1071 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1072 | tcp_put_md5sig_pool(); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1073 | return 0; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1074 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1075 | clear_hash: |
| 1076 | tcp_put_md5sig_pool(); |
| 1077 | clear_hash_noput: |
| 1078 | memset(md5_hash, 0, 16); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1079 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1080 | } |
| 1081 | |
Eric Dumazet | 39f8e58 | 2015-03-24 15:58:55 -0700 | [diff] [blame] | 1082 | int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key, |
| 1083 | const struct sock *sk, |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 1084 | const struct sk_buff *skb) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1085 | { |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1086 | struct tcp_md5sig_pool *hp; |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1087 | struct ahash_request *req; |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 1088 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1089 | __be32 saddr, daddr; |
| 1090 | |
Eric Dumazet | 39f8e58 | 2015-03-24 15:58:55 -0700 | [diff] [blame] | 1091 | if (sk) { /* valid for establish/request sockets */ |
| 1092 | saddr = sk->sk_rcv_saddr; |
| 1093 | daddr = sk->sk_daddr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1094 | } else { |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1095 | const struct iphdr *iph = ip_hdr(skb); |
| 1096 | saddr = iph->saddr; |
| 1097 | daddr = iph->daddr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1098 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1099 | |
| 1100 | hp = tcp_get_md5sig_pool(); |
| 1101 | if (!hp) |
| 1102 | goto clear_hash_noput; |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1103 | req = hp->md5_req; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1104 | |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1105 | if (crypto_ahash_init(req)) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1106 | goto clear_hash; |
| 1107 | |
Eric Dumazet | 19689e3 | 2016-06-27 18:51:53 +0200 | [diff] [blame] | 1108 | if (tcp_v4_md5_hash_headers(hp, daddr, saddr, th, skb->len)) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1109 | goto clear_hash; |
| 1110 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) |
| 1111 | goto clear_hash; |
| 1112 | if (tcp_md5_hash_key(hp, key)) |
| 1113 | goto clear_hash; |
Herbert Xu | cf80e0e | 2016-01-24 21:20:23 +0800 | [diff] [blame] | 1114 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
| 1115 | if (crypto_ahash_final(req)) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1116 | goto clear_hash; |
| 1117 | |
| 1118 | tcp_put_md5sig_pool(); |
| 1119 | return 0; |
| 1120 | |
| 1121 | clear_hash: |
| 1122 | tcp_put_md5sig_pool(); |
| 1123 | clear_hash_noput: |
| 1124 | memset(md5_hash, 0, 16); |
| 1125 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1126 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1127 | EXPORT_SYMBOL(tcp_v4_md5_hash_skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1128 | |
Eric Dumazet | ba8e275 | 2015-10-02 11:43:28 -0700 | [diff] [blame] | 1129 | #endif |
| 1130 | |
Eric Dumazet | ff74e23 | 2015-03-24 15:58:54 -0700 | [diff] [blame] | 1131 | /* Called with rcu_read_lock() */ |
Eric Dumazet | ba8e275 | 2015-10-02 11:43:28 -0700 | [diff] [blame] | 1132 | static bool tcp_v4_inbound_md5_hash(const struct sock *sk, |
Eric Dumazet | ff74e23 | 2015-03-24 15:58:54 -0700 | [diff] [blame] | 1133 | const struct sk_buff *skb) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1134 | { |
Eric Dumazet | ba8e275 | 2015-10-02 11:43:28 -0700 | [diff] [blame] | 1135 | #ifdef CONFIG_TCP_MD5SIG |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1136 | /* |
| 1137 | * This gets called for each TCP segment that arrives |
| 1138 | * so we want to be efficient. |
| 1139 | * We have 3 drop cases: |
| 1140 | * o No MD5 hash and one expected. |
| 1141 | * o MD5 hash and we're not expecting one. |
| 1142 | * o MD5 hash and its wrong. |
| 1143 | */ |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1144 | const __u8 *hash_location = NULL; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1145 | struct tcp_md5sig_key *hash_expected; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1146 | const struct iphdr *iph = ip_hdr(skb); |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1147 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1148 | int genhash; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1149 | unsigned char newhash[16]; |
| 1150 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1151 | hash_expected = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&iph->saddr, |
| 1152 | AF_INET); |
YOSHIFUJI Hideaki | 7d5d552 | 2008-04-17 12:29:53 +0900 | [diff] [blame] | 1153 | hash_location = tcp_parse_md5sig_option(th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1154 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1155 | /* We've parsed the options - do we have a hash? */ |
| 1156 | if (!hash_expected && !hash_location) |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1157 | return false; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1158 | |
| 1159 | if (hash_expected && !hash_location) { |
Eric Dumazet | c10d931 | 2016-04-29 14:16:47 -0700 | [diff] [blame] | 1160 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1161 | return true; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1162 | } |
| 1163 | |
| 1164 | if (!hash_expected && hash_location) { |
Eric Dumazet | c10d931 | 2016-04-29 14:16:47 -0700 | [diff] [blame] | 1165 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1166 | return true; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1167 | } |
| 1168 | |
| 1169 | /* Okay, so this is hash_expected and hash_location - |
| 1170 | * so we need to calculate the checksum. |
| 1171 | */ |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1172 | genhash = tcp_v4_md5_hash_skb(newhash, |
| 1173 | hash_expected, |
Eric Dumazet | 39f8e58 | 2015-03-24 15:58:55 -0700 | [diff] [blame] | 1174 | NULL, skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1175 | |
| 1176 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
Eric Dumazet | 72145a6 | 2016-08-24 09:01:23 -0700 | [diff] [blame] | 1177 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE); |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1178 | net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s\n", |
| 1179 | &iph->saddr, ntohs(th->source), |
| 1180 | &iph->daddr, ntohs(th->dest), |
| 1181 | genhash ? " tcp_v4_calc_md5_hash failed" |
| 1182 | : ""); |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1183 | return true; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1184 | } |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1185 | return false; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1186 | #endif |
Eric Dumazet | ba8e275 | 2015-10-02 11:43:28 -0700 | [diff] [blame] | 1187 | return false; |
| 1188 | } |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1189 | |
Eric Dumazet | b40cf18 | 2015-09-25 07:39:08 -0700 | [diff] [blame] | 1190 | static void tcp_v4_init_req(struct request_sock *req, |
| 1191 | const struct sock *sk_listener, |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 1192 | struct sk_buff *skb) |
| 1193 | { |
| 1194 | struct inet_request_sock *ireq = inet_rsk(req); |
| 1195 | |
Eric Dumazet | 08d2cc3b | 2015-03-18 14:05:38 -0700 | [diff] [blame] | 1196 | sk_rcv_saddr_set(req_to_sk(req), ip_hdr(skb)->daddr); |
| 1197 | sk_daddr_set(req_to_sk(req), ip_hdr(skb)->saddr); |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 1198 | ireq->opt = tcp_v4_save_options(skb); |
| 1199 | } |
| 1200 | |
Eric Dumazet | f964629 | 2015-09-29 07:42:50 -0700 | [diff] [blame] | 1201 | static struct dst_entry *tcp_v4_route_req(const struct sock *sk, |
| 1202 | struct flowi *fl, |
Octavian Purdila | d94e041 | 2014-06-25 17:09:55 +0300 | [diff] [blame] | 1203 | const struct request_sock *req, |
| 1204 | bool *strict) |
| 1205 | { |
| 1206 | struct dst_entry *dst = inet_csk_route_req(sk, &fl->u.ip4, req); |
| 1207 | |
| 1208 | if (strict) { |
| 1209 | if (fl->u.ip4.daddr == inet_rsk(req)->ir_rmt_addr) |
| 1210 | *strict = true; |
| 1211 | else |
| 1212 | *strict = false; |
| 1213 | } |
| 1214 | |
| 1215 | return dst; |
| 1216 | } |
| 1217 | |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 1218 | struct request_sock_ops tcp_request_sock_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | .family = PF_INET, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1220 | .obj_size = sizeof(struct tcp_request_sock), |
Octavian Purdila | 5db92c9 | 2014-06-25 17:09:59 +0300 | [diff] [blame] | 1221 | .rtx_syn_ack = tcp_rtx_synack, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1222 | .send_ack = tcp_v4_reqsk_send_ack, |
| 1223 | .destructor = tcp_v4_reqsk_destructor, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | .send_reset = tcp_v4_send_reset, |
stephen hemminger | 688d194 | 2014-08-29 23:32:05 -0700 | [diff] [blame] | 1225 | .syn_ack_timeout = tcp_syn_ack_timeout, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | }; |
| 1227 | |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 1228 | static const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = { |
Octavian Purdila | 2aec4a2 | 2014-06-25 17:10:00 +0300 | [diff] [blame] | 1229 | .mss_clamp = TCP_MSS_DEFAULT, |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 1230 | #ifdef CONFIG_TCP_MD5SIG |
Eric Dumazet | fd3a154 | 2015-03-24 15:58:56 -0700 | [diff] [blame] | 1231 | .req_md5_lookup = tcp_v4_md5_lookup, |
John Dykstra | e3afe7b | 2009-07-16 05:04:51 +0000 | [diff] [blame] | 1232 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 1233 | #endif |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 1234 | .init_req = tcp_v4_init_req, |
Octavian Purdila | fb7b37a | 2014-06-25 17:09:54 +0300 | [diff] [blame] | 1235 | #ifdef CONFIG_SYN_COOKIES |
| 1236 | .cookie_init_seq = cookie_v4_init_sequence, |
| 1237 | #endif |
Octavian Purdila | d94e041 | 2014-06-25 17:09:55 +0300 | [diff] [blame] | 1238 | .route_req = tcp_v4_route_req, |
Octavian Purdila | 936b8bd | 2014-06-25 17:09:57 +0300 | [diff] [blame] | 1239 | .init_seq = tcp_v4_init_sequence, |
Octavian Purdila | d6274bd | 2014-06-25 17:09:58 +0300 | [diff] [blame] | 1240 | .send_synack = tcp_v4_send_synack, |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 1241 | }; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) |
| 1244 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | /* Never answer to SYNs send to broadcast or multicast */ |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 1246 | if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | goto drop; |
| 1248 | |
Octavian Purdila | 1fb6f15 | 2014-06-25 17:10:02 +0300 | [diff] [blame] | 1249 | return tcp_conn_request(&tcp_request_sock_ops, |
| 1250 | &tcp_request_sock_ipv4_ops, sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | drop: |
Eric Dumazet | 9caad86 | 2016-04-01 08:52:20 -0700 | [diff] [blame] | 1253 | tcp_listendrop(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | return 0; |
| 1255 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1256 | EXPORT_SYMBOL(tcp_v4_conn_request); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | |
| 1258 | |
| 1259 | /* |
| 1260 | * The three way handshake has completed - we got a valid synack - |
| 1261 | * now create the new socket. |
| 1262 | */ |
Eric Dumazet | 0c27171 | 2015-09-29 07:42:48 -0700 | [diff] [blame] | 1263 | struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1264 | struct request_sock *req, |
Eric Dumazet | 5e0724d | 2015-10-22 08:20:46 -0700 | [diff] [blame] | 1265 | struct dst_entry *dst, |
| 1266 | struct request_sock *req_unhash, |
| 1267 | bool *own_req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1269 | struct inet_request_sock *ireq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | struct inet_sock *newinet; |
| 1271 | struct tcp_sock *newtp; |
| 1272 | struct sock *newsk; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1273 | #ifdef CONFIG_TCP_MD5SIG |
| 1274 | struct tcp_md5sig_key *key; |
| 1275 | #endif |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1276 | struct ip_options_rcu *inet_opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | |
| 1278 | if (sk_acceptq_is_full(sk)) |
| 1279 | goto exit_overflow; |
| 1280 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | newsk = tcp_create_openreq_child(sk, req, skb); |
| 1282 | if (!newsk) |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1283 | goto exit_nonewsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 1285 | newsk->sk_gso_type = SKB_GSO_TCPV4; |
Neal Cardwell | fae6ef8 | 2012-08-19 03:30:38 +0000 | [diff] [blame] | 1286 | inet_sk_rx_dst_set(newsk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | |
| 1288 | newtp = tcp_sk(newsk); |
| 1289 | newinet = inet_sk(newsk); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1290 | ireq = inet_rsk(req); |
Eric Dumazet | d1e559d | 2015-03-18 14:05:35 -0700 | [diff] [blame] | 1291 | sk_daddr_set(newsk, ireq->ir_rmt_addr); |
| 1292 | sk_rcv_saddr_set(newsk, ireq->ir_loc_addr); |
David Ahern | 6dd9a14 | 2015-12-16 13:20:44 -0800 | [diff] [blame] | 1293 | newsk->sk_bound_dev_if = ireq->ir_iif; |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 1294 | newinet->inet_saddr = ireq->ir_loc_addr; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1295 | inet_opt = ireq->opt; |
| 1296 | rcu_assign_pointer(newinet->inet_opt, inet_opt); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1297 | ireq->opt = NULL; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1298 | newinet->mc_index = inet_iif(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1299 | newinet->mc_ttl = ip_hdr(skb)->ttl; |
Jiri Benc | 4c507d2 | 2012-02-09 09:35:49 +0000 | [diff] [blame] | 1300 | newinet->rcv_tos = ip_hdr(skb)->tos; |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1301 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1302 | if (inet_opt) |
| 1303 | inet_csk(newsk)->icsk_ext_hdr_len = inet_opt->opt.optlen; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1304 | newinet->inet_id = newtp->write_seq ^ jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | |
Eric Dumazet | dfd25ff | 2012-03-10 09:20:21 +0000 | [diff] [blame] | 1306 | if (!dst) { |
| 1307 | dst = inet_csk_route_child_sock(sk, newsk, req); |
| 1308 | if (!dst) |
| 1309 | goto put_and_exit; |
| 1310 | } else { |
| 1311 | /* syncookie case : see end of cookie_v4_check() */ |
| 1312 | } |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1313 | sk_setup_caps(newsk, dst); |
| 1314 | |
Daniel Borkmann | 8116441 | 2015-01-05 23:57:48 +0100 | [diff] [blame] | 1315 | tcp_ca_openreq_child(newsk, dst); |
| 1316 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | tcp_sync_mss(newsk, dst_mtu(dst)); |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 1318 | newtp->advmss = dst_metric_advmss(dst); |
Tom Quetchenbach | f5fff5d | 2008-09-21 00:21:51 -0700 | [diff] [blame] | 1319 | if (tcp_sk(sk)->rx_opt.user_mss && |
| 1320 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) |
| 1321 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; |
| 1322 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | tcp_initialize_rcv_mss(newsk); |
| 1324 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1325 | #ifdef CONFIG_TCP_MD5SIG |
| 1326 | /* Copy over the MD5 key from the original socket */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1327 | key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&newinet->inet_daddr, |
| 1328 | AF_INET); |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 1329 | if (key) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1330 | /* |
| 1331 | * We're using one, so create a matching key |
| 1332 | * on the newsk structure. If we fail to get |
| 1333 | * memory, then we end up not copying the key |
| 1334 | * across. Shucks. |
| 1335 | */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1336 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newinet->inet_daddr, |
| 1337 | AF_INET, key->key, key->keylen, GFP_ATOMIC); |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 1338 | sk_nocaps_add(newsk, NETIF_F_GSO_MASK); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1339 | } |
| 1340 | #endif |
| 1341 | |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1342 | if (__inet_inherit_port(sk, newsk) < 0) |
| 1343 | goto put_and_exit; |
Eric Dumazet | 5e0724d | 2015-10-22 08:20:46 -0700 | [diff] [blame] | 1344 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); |
Eric Dumazet | 805c4bc | 2015-11-05 11:07:13 -0800 | [diff] [blame] | 1345 | if (*own_req) |
Eric Dumazet | 49a496c | 2015-11-05 12:50:19 -0800 | [diff] [blame] | 1346 | tcp_move_syn(newtp, req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | |
| 1348 | return newsk; |
| 1349 | |
| 1350 | exit_overflow: |
Eric Dumazet | c10d931 | 2016-04-29 14:16:47 -0700 | [diff] [blame] | 1351 | NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1352 | exit_nonewsk: |
| 1353 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | exit: |
Eric Dumazet | 9caad86 | 2016-04-01 08:52:20 -0700 | [diff] [blame] | 1355 | tcp_listendrop(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | return NULL; |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1357 | put_and_exit: |
Christoph Paasch | e337e24 | 2012-12-14 04:07:58 +0000 | [diff] [blame] | 1358 | inet_csk_prepare_forced_close(newsk); |
| 1359 | tcp_done(newsk); |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1360 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1362 | EXPORT_SYMBOL(tcp_v4_syn_recv_sock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1364 | static struct sock *tcp_v4_cookie_check(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | #ifdef CONFIG_SYN_COOKIES |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1367 | const struct tcphdr *th = tcp_hdr(skb); |
| 1368 | |
Florian Westphal | af9b473 | 2010-06-03 00:43:44 +0000 | [diff] [blame] | 1369 | if (!th->syn) |
Cong Wang | 461b74c | 2014-10-15 14:33:22 -0700 | [diff] [blame] | 1370 | sk = cookie_v4_check(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | #endif |
| 1372 | return sk; |
| 1373 | } |
| 1374 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | /* The socket must have it's spinlock held when we get |
Eric Dumazet | e994b2f | 2015-10-02 11:43:39 -0700 | [diff] [blame] | 1376 | * here, unless it is a TCP_LISTEN socket. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | * |
| 1378 | * We have a potential double-lock case here, so even when |
| 1379 | * doing backlog processing we use the BH locking scheme. |
| 1380 | * This is because we cannot sleep with the original spinlock |
| 1381 | * held. |
| 1382 | */ |
| 1383 | int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) |
| 1384 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1385 | struct sock *rsk; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1386 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
Eric Dumazet | 404e0a8 | 2012-07-29 23:20:37 +0000 | [diff] [blame] | 1388 | struct dst_entry *dst = sk->sk_rx_dst; |
| 1389 | |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1390 | sock_rps_save_rxhash(sk, skb); |
Eric Dumazet | 3d97379 | 2014-11-11 05:54:27 -0800 | [diff] [blame] | 1391 | sk_mark_napi_id(sk, skb); |
Eric Dumazet | 404e0a8 | 2012-07-29 23:20:37 +0000 | [diff] [blame] | 1392 | if (dst) { |
Eric Dumazet | 505fbcf | 2012-07-27 06:23:40 +0000 | [diff] [blame] | 1393 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1394 | !dst->ops->check(dst, 0)) { |
David S. Miller | 92101b3 | 2012-07-23 16:29:00 -0700 | [diff] [blame] | 1395 | dst_release(dst); |
| 1396 | sk->sk_rx_dst = NULL; |
| 1397 | } |
| 1398 | } |
Vijay Subramanian | c995ae2 | 2013-09-03 12:23:22 -0700 | [diff] [blame] | 1399 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | return 0; |
| 1401 | } |
| 1402 | |
Eric Dumazet | 12e25e1 | 2015-06-03 23:49:21 -0700 | [diff] [blame] | 1403 | if (tcp_checksum_complete(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | goto csum_err; |
| 1405 | |
| 1406 | if (sk->sk_state == TCP_LISTEN) { |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1407 | struct sock *nsk = tcp_v4_cookie_check(sk, skb); |
| 1408 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | if (!nsk) |
| 1410 | goto discard; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1411 | if (nsk != sk) { |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1412 | sock_rps_save_rxhash(nsk, skb); |
Eric Dumazet | 38cb524 | 2015-10-02 11:43:26 -0700 | [diff] [blame] | 1413 | sk_mark_napi_id(nsk, skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1414 | if (tcp_child_process(sk, nsk, skb)) { |
| 1415 | rsk = nsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | goto reset; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1417 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | return 0; |
| 1419 | } |
Eric Dumazet | ca55158 | 2010-06-03 09:03:58 +0000 | [diff] [blame] | 1420 | } else |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1421 | sock_rps_save_rxhash(sk, skb); |
Eric Dumazet | ca55158 | 2010-06-03 09:03:58 +0000 | [diff] [blame] | 1422 | |
Eric Dumazet | 72ab4a8 | 2015-09-29 07:42:41 -0700 | [diff] [blame] | 1423 | if (tcp_rcv_state_process(sk, skb)) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1424 | rsk = sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | goto reset; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1426 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | return 0; |
| 1428 | |
| 1429 | reset: |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1430 | tcp_v4_send_reset(rsk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | discard: |
| 1432 | kfree_skb(skb); |
| 1433 | /* Be careful here. If this function gets more complicated and |
| 1434 | * gcc suffers from register pressure on the x86, sk (in %ebx) |
| 1435 | * might be destroyed here. This current version compiles correctly, |
| 1436 | * but you have been warned. |
| 1437 | */ |
| 1438 | return 0; |
| 1439 | |
| 1440 | csum_err: |
Eric Dumazet | c10d931 | 2016-04-29 14:16:47 -0700 | [diff] [blame] | 1441 | TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS); |
| 1442 | TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | goto discard; |
| 1444 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1445 | EXPORT_SYMBOL(tcp_v4_do_rcv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | |
David S. Miller | 160eb5a | 2012-06-27 22:01:22 -0700 | [diff] [blame] | 1447 | void tcp_v4_early_demux(struct sk_buff *skb) |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1448 | { |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1449 | const struct iphdr *iph; |
| 1450 | const struct tcphdr *th; |
| 1451 | struct sock *sk; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1452 | |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1453 | if (skb->pkt_type != PACKET_HOST) |
David S. Miller | 160eb5a | 2012-06-27 22:01:22 -0700 | [diff] [blame] | 1454 | return; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1455 | |
Eric Dumazet | 45f00f9 | 2012-10-22 21:42:47 +0000 | [diff] [blame] | 1456 | 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] | 1457 | return; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1458 | |
| 1459 | iph = ip_hdr(skb); |
Eric Dumazet | 45f00f9 | 2012-10-22 21:42:47 +0000 | [diff] [blame] | 1460 | th = tcp_hdr(skb); |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1461 | |
| 1462 | if (th->doff < sizeof(struct tcphdr) / 4) |
David S. Miller | 160eb5a | 2012-06-27 22:01:22 -0700 | [diff] [blame] | 1463 | return; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1464 | |
Eric Dumazet | 45f00f9 | 2012-10-22 21:42:47 +0000 | [diff] [blame] | 1465 | sk = __inet_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1466 | iph->saddr, th->source, |
Vijay Subramanian | 7011d08 | 2012-06-23 17:38:10 +0000 | [diff] [blame] | 1467 | iph->daddr, ntohs(th->dest), |
Eric Dumazet | 9cb429d | 2012-07-24 01:19:31 +0000 | [diff] [blame] | 1468 | skb->skb_iif); |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1469 | if (sk) { |
| 1470 | skb->sk = sk; |
| 1471 | skb->destructor = sock_edemux; |
Eric Dumazet | f7e4eb0 | 2015-03-15 21:12:13 -0700 | [diff] [blame] | 1472 | if (sk_fullsock(sk)) { |
Michal Kubeček | d0c294c | 2015-03-23 15:14:00 +0100 | [diff] [blame] | 1473 | struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst); |
Eric Dumazet | 505fbcf | 2012-07-27 06:23:40 +0000 | [diff] [blame] | 1474 | |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1475 | if (dst) |
| 1476 | dst = dst_check(dst, 0); |
David S. Miller | 92101b3 | 2012-07-23 16:29:00 -0700 | [diff] [blame] | 1477 | if (dst && |
Eric Dumazet | 505fbcf | 2012-07-27 06:23:40 +0000 | [diff] [blame] | 1478 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
David S. Miller | 92101b3 | 2012-07-23 16:29:00 -0700 | [diff] [blame] | 1479 | skb_dst_set_noref(skb, dst); |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1480 | } |
| 1481 | } |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1482 | } |
| 1483 | |
Eric Dumazet | b2fb4f5 | 2013-03-06 12:58:01 +0000 | [diff] [blame] | 1484 | /* Packet is added to VJ-style prequeue for processing in process |
| 1485 | * context, if a reader task is waiting. Apparently, this exciting |
| 1486 | * idea (VJ's mail "Re: query about TCP header on tcp-ip" of 07 Sep 93) |
| 1487 | * failed somewhere. Latency? Burstiness? Well, at least now we will |
| 1488 | * see, why it failed. 8)8) --ANK |
| 1489 | * |
| 1490 | */ |
| 1491 | bool tcp_prequeue(struct sock *sk, struct sk_buff *skb) |
| 1492 | { |
| 1493 | struct tcp_sock *tp = tcp_sk(sk); |
| 1494 | |
| 1495 | if (sysctl_tcp_low_latency || !tp->ucopy.task) |
| 1496 | return false; |
| 1497 | |
| 1498 | if (skb->len <= tcp_hdrlen(skb) && |
| 1499 | skb_queue_len(&tp->ucopy.prequeue) == 0) |
| 1500 | return false; |
| 1501 | |
Eric Dumazet | ca777ef | 2014-09-08 08:06:07 -0700 | [diff] [blame] | 1502 | /* Before escaping RCU protected region, we need to take care of skb |
| 1503 | * dst. Prequeue is only enabled for established sockets. |
| 1504 | * For such sockets, we might need the skb dst only to set sk->sk_rx_dst |
| 1505 | * Instead of doing full sk_rx_dst validity here, let's perform |
| 1506 | * an optimistic check. |
| 1507 | */ |
| 1508 | if (likely(sk->sk_rx_dst)) |
| 1509 | skb_dst_drop(skb); |
| 1510 | else |
Eric Dumazet | 5037e9e | 2015-12-14 14:08:53 -0800 | [diff] [blame] | 1511 | skb_dst_force_safe(skb); |
Eric Dumazet | ca777ef | 2014-09-08 08:06:07 -0700 | [diff] [blame] | 1512 | |
Eric Dumazet | b2fb4f5 | 2013-03-06 12:58:01 +0000 | [diff] [blame] | 1513 | __skb_queue_tail(&tp->ucopy.prequeue, skb); |
| 1514 | tp->ucopy.memory += skb->truesize; |
Eric Dumazet | 0cef6a4 | 2016-04-27 10:12:25 -0700 | [diff] [blame] | 1515 | if (skb_queue_len(&tp->ucopy.prequeue) >= 32 || |
| 1516 | tp->ucopy.memory + atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf) { |
Eric Dumazet | b2fb4f5 | 2013-03-06 12:58:01 +0000 | [diff] [blame] | 1517 | struct sk_buff *skb1; |
| 1518 | |
| 1519 | BUG_ON(sock_owned_by_user(sk)); |
Eric Dumazet | 0cef6a4 | 2016-04-27 10:12:25 -0700 | [diff] [blame] | 1520 | __NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPPREQUEUEDROPPED, |
| 1521 | skb_queue_len(&tp->ucopy.prequeue)); |
Eric Dumazet | b2fb4f5 | 2013-03-06 12:58:01 +0000 | [diff] [blame] | 1522 | |
Eric Dumazet | 0cef6a4 | 2016-04-27 10:12:25 -0700 | [diff] [blame] | 1523 | while ((skb1 = __skb_dequeue(&tp->ucopy.prequeue)) != NULL) |
Eric Dumazet | b2fb4f5 | 2013-03-06 12:58:01 +0000 | [diff] [blame] | 1524 | sk_backlog_rcv(sk, skb1); |
Eric Dumazet | b2fb4f5 | 2013-03-06 12:58:01 +0000 | [diff] [blame] | 1525 | |
| 1526 | tp->ucopy.memory = 0; |
| 1527 | } else if (skb_queue_len(&tp->ucopy.prequeue) == 1) { |
| 1528 | wake_up_interruptible_sync_poll(sk_sleep(sk), |
| 1529 | POLLIN | POLLRDNORM | POLLRDBAND); |
| 1530 | if (!inet_csk_ack_scheduled(sk)) |
| 1531 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, |
| 1532 | (3 * tcp_rto_min(sk)) / 4, |
| 1533 | TCP_RTO_MAX); |
| 1534 | } |
| 1535 | return true; |
| 1536 | } |
| 1537 | EXPORT_SYMBOL(tcp_prequeue); |
| 1538 | |
Eric Dumazet | c9c3321 | 2016-08-27 07:37:54 -0700 | [diff] [blame] | 1539 | bool tcp_add_backlog(struct sock *sk, struct sk_buff *skb) |
| 1540 | { |
| 1541 | u32 limit = sk->sk_rcvbuf + sk->sk_sndbuf; |
| 1542 | |
| 1543 | /* Only socket owner can try to collapse/prune rx queues |
| 1544 | * to reduce memory overhead, so add a little headroom here. |
| 1545 | * Few sockets backlog are possibly concurrently non empty. |
| 1546 | */ |
| 1547 | limit += 64*1024; |
| 1548 | |
| 1549 | /* In case all data was pulled from skb frags (in __pskb_pull_tail()), |
| 1550 | * we can fix skb->truesize to its real value to avoid future drops. |
| 1551 | * This is valid because skb is not yet charged to the socket. |
| 1552 | * It has been noticed pure SACK packets were sometimes dropped |
| 1553 | * (if cooked by drivers without copybreak feature). |
| 1554 | */ |
| 1555 | if (!skb->data_len) |
| 1556 | skb->truesize = SKB_TRUESIZE(skb_end_offset(skb)); |
| 1557 | |
| 1558 | if (unlikely(sk_add_backlog(sk, skb, limit))) { |
| 1559 | bh_unlock_sock(sk); |
| 1560 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPBACKLOGDROP); |
| 1561 | return true; |
| 1562 | } |
| 1563 | return false; |
| 1564 | } |
| 1565 | EXPORT_SYMBOL(tcp_add_backlog); |
| 1566 | |
Eric Dumazet | ac6e780 | 2016-11-10 13:12:35 -0800 | [diff] [blame] | 1567 | int tcp_filter(struct sock *sk, struct sk_buff *skb) |
| 1568 | { |
| 1569 | struct tcphdr *th = (struct tcphdr *)skb->data; |
| 1570 | unsigned int eaten = skb->len; |
| 1571 | int err; |
| 1572 | |
| 1573 | err = sk_filter_trim_cap(sk, skb, th->doff * 4); |
| 1574 | if (!err) { |
| 1575 | eaten -= skb->len; |
| 1576 | TCP_SKB_CB(skb)->end_seq -= eaten; |
| 1577 | } |
| 1578 | return err; |
| 1579 | } |
| 1580 | EXPORT_SYMBOL(tcp_filter); |
| 1581 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | /* |
| 1583 | * From tcp_input.c |
| 1584 | */ |
| 1585 | |
| 1586 | int tcp_v4_rcv(struct sk_buff *skb) |
| 1587 | { |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1588 | struct net *net = dev_net(skb->dev); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1589 | const struct iphdr *iph; |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1590 | const struct tcphdr *th; |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1591 | bool refcounted; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1592 | struct sock *sk; |
| 1593 | int ret; |
| 1594 | |
| 1595 | if (skb->pkt_type != PACKET_HOST) |
| 1596 | goto discard_it; |
| 1597 | |
| 1598 | /* Count it even if it's bad */ |
Eric Dumazet | 90bbcc6 | 2016-04-27 16:44:32 -0700 | [diff] [blame] | 1599 | __TCP_INC_STATS(net, TCP_MIB_INSEGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | |
| 1601 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) |
| 1602 | goto discard_it; |
| 1603 | |
Eric Dumazet | ea1627c | 2016-05-13 09:16:40 -0700 | [diff] [blame] | 1604 | th = (const struct tcphdr *)skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | |
Eric Dumazet | ea1627c | 2016-05-13 09:16:40 -0700 | [diff] [blame] | 1606 | if (unlikely(th->doff < sizeof(struct tcphdr) / 4)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1607 | goto bad_packet; |
| 1608 | if (!pskb_may_pull(skb, th->doff * 4)) |
| 1609 | goto discard_it; |
| 1610 | |
| 1611 | /* An explanation is required here, I think. |
| 1612 | * Packet length and doff are validated by header prediction, |
Stephen Hemminger | caa20d9a | 2005-11-10 17:13:47 -0800 | [diff] [blame] | 1613 | * provided case of th->doff==0 is eliminated. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | * So, we defer the checks. */ |
Tom Herbert | ed70fcf | 2014-05-02 16:29:38 -0700 | [diff] [blame] | 1615 | |
| 1616 | if (skb_checksum_init(skb, IPPROTO_TCP, inet_compute_pseudo)) |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1617 | goto csum_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | |
Eric Dumazet | ea1627c | 2016-05-13 09:16:40 -0700 | [diff] [blame] | 1619 | th = (const struct tcphdr *)skb->data; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1620 | iph = ip_hdr(skb); |
Eric Dumazet | 971f10e | 2014-09-27 09:50:57 -0700 | [diff] [blame] | 1621 | /* This is tricky : We move IPCB at its correct location into TCP_SKB_CB() |
| 1622 | * barrier() makes sure compiler wont play fool^Waliasing games. |
| 1623 | */ |
| 1624 | memmove(&TCP_SKB_CB(skb)->header.h4, IPCB(skb), |
| 1625 | sizeof(struct inet_skb_parm)); |
| 1626 | barrier(); |
| 1627 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
| 1629 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + |
| 1630 | skb->len - th->doff * 4); |
| 1631 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); |
Eric Dumazet | e11ecdd | 2014-09-15 04:19:51 -0700 | [diff] [blame] | 1632 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); |
Eric Dumazet | 04317da | 2014-09-05 15:33:32 -0700 | [diff] [blame] | 1633 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; |
Eric Dumazet | b82d1bb | 2011-09-27 02:20:08 -0400 | [diff] [blame] | 1634 | TCP_SKB_CB(skb)->ip_dsfield = ipv4_get_dsfield(iph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1635 | TCP_SKB_CB(skb)->sacked = 0; |
| 1636 | |
Eric Dumazet | 4bdc3d6 | 2015-10-13 17:12:54 -0700 | [diff] [blame] | 1637 | lookup: |
Craig Gallek | a583636 | 2016-02-10 11:50:38 -0500 | [diff] [blame] | 1638 | sk = __inet_lookup_skb(&tcp_hashinfo, skb, __tcp_hdrlen(th), th->source, |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1639 | th->dest, &refcounted); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | if (!sk) |
| 1641 | goto no_tcp_socket; |
| 1642 | |
Eric Dumazet | bb134d5 | 2010-03-09 05:55:56 +0000 | [diff] [blame] | 1643 | process: |
| 1644 | if (sk->sk_state == TCP_TIME_WAIT) |
| 1645 | goto do_time_wait; |
| 1646 | |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1647 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
| 1648 | struct request_sock *req = inet_reqsk(sk); |
Eric Dumazet | 7716682 | 2016-02-18 05:39:18 -0800 | [diff] [blame] | 1649 | struct sock *nsk; |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1650 | |
| 1651 | sk = req->rsk_listener; |
Eric Dumazet | 7292355 | 2016-02-11 22:50:29 -0800 | [diff] [blame] | 1652 | if (unlikely(tcp_v4_inbound_md5_hash(sk, skb))) { |
Eric Dumazet | e65c332 | 2016-08-24 08:50:24 -0700 | [diff] [blame] | 1653 | sk_drops_add(sk, skb); |
Eric Dumazet | 7292355 | 2016-02-11 22:50:29 -0800 | [diff] [blame] | 1654 | reqsk_put(req); |
| 1655 | goto discard_it; |
| 1656 | } |
Eric Dumazet | 7716682 | 2016-02-18 05:39:18 -0800 | [diff] [blame] | 1657 | if (unlikely(sk->sk_state != TCP_LISTEN)) { |
Eric Dumazet | f03f2e1 | 2015-10-14 11:16:27 -0700 | [diff] [blame] | 1658 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
Eric Dumazet | 4bdc3d6 | 2015-10-13 17:12:54 -0700 | [diff] [blame] | 1659 | goto lookup; |
| 1660 | } |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1661 | /* We own a reference on the listener, increase it again |
| 1662 | * as we might lose it too soon. |
| 1663 | */ |
Eric Dumazet | 7716682 | 2016-02-18 05:39:18 -0800 | [diff] [blame] | 1664 | sock_hold(sk); |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1665 | refcounted = true; |
Eric Dumazet | 7716682 | 2016-02-18 05:39:18 -0800 | [diff] [blame] | 1666 | nsk = tcp_check_req(sk, skb, req, false); |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1667 | if (!nsk) { |
| 1668 | reqsk_put(req); |
Eric Dumazet | 7716682 | 2016-02-18 05:39:18 -0800 | [diff] [blame] | 1669 | goto discard_and_relse; |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1670 | } |
| 1671 | if (nsk == sk) { |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1672 | reqsk_put(req); |
| 1673 | } else if (tcp_child_process(sk, nsk, skb)) { |
| 1674 | tcp_v4_send_reset(nsk, skb); |
Eric Dumazet | 7716682 | 2016-02-18 05:39:18 -0800 | [diff] [blame] | 1675 | goto discard_and_relse; |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1676 | } else { |
Eric Dumazet | 7716682 | 2016-02-18 05:39:18 -0800 | [diff] [blame] | 1677 | sock_put(sk); |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 1678 | return 0; |
| 1679 | } |
| 1680 | } |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 1681 | if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { |
Eric Dumazet | 02a1d6e | 2016-04-27 16:44:39 -0700 | [diff] [blame] | 1682 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
Stephen Hemminger | d218d11 | 2010-01-11 16:28:01 -0800 | [diff] [blame] | 1683 | goto discard_and_relse; |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 1684 | } |
Stephen Hemminger | d218d11 | 2010-01-11 16:28:01 -0800 | [diff] [blame] | 1685 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 1687 | goto discard_and_relse; |
Dmitry Popov | 9ea88a1 | 2014-08-07 02:38:22 +0400 | [diff] [blame] | 1688 | |
Dmitry Popov | 9ea88a1 | 2014-08-07 02:38:22 +0400 | [diff] [blame] | 1689 | if (tcp_v4_inbound_md5_hash(sk, skb)) |
| 1690 | goto discard_and_relse; |
Dmitry Popov | 9ea88a1 | 2014-08-07 02:38:22 +0400 | [diff] [blame] | 1691 | |
Patrick McHardy | b59c270 | 2006-01-06 23:06:10 -0800 | [diff] [blame] | 1692 | nf_reset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1693 | |
Eric Dumazet | ac6e780 | 2016-11-10 13:12:35 -0800 | [diff] [blame] | 1694 | if (tcp_filter(sk, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | goto discard_and_relse; |
Eric Dumazet | ac6e780 | 2016-11-10 13:12:35 -0800 | [diff] [blame] | 1696 | th = (const struct tcphdr *)skb->data; |
| 1697 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | |
| 1699 | skb->dev = NULL; |
| 1700 | |
Eric Dumazet | e994b2f | 2015-10-02 11:43:39 -0700 | [diff] [blame] | 1701 | if (sk->sk_state == TCP_LISTEN) { |
| 1702 | ret = tcp_v4_do_rcv(sk, skb); |
| 1703 | goto put_and_return; |
| 1704 | } |
| 1705 | |
| 1706 | sk_incoming_cpu_update(sk); |
| 1707 | |
Ingo Molnar | c636618 | 2006-07-03 00:25:13 -0700 | [diff] [blame] | 1708 | bh_lock_sock_nested(sk); |
Martin KaFai Lau | a44d6ea | 2016-03-14 10:52:15 -0700 | [diff] [blame] | 1709 | tcp_segs_in(tcp_sk(sk), skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | ret = 0; |
| 1711 | if (!sock_owned_by_user(sk)) { |
Dan Williams | 7bced39 | 2013-12-30 12:37:29 -0800 | [diff] [blame] | 1712 | if (!tcp_prequeue(sk, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | ret = tcp_v4_do_rcv(sk, skb); |
Eric Dumazet | c9c3321 | 2016-08-27 07:37:54 -0700 | [diff] [blame] | 1714 | } else if (tcp_add_backlog(sk, skb)) { |
Zhu Yi | 6b03a53 | 2010-03-04 18:01:41 +0000 | [diff] [blame] | 1715 | goto discard_and_relse; |
| 1716 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1717 | bh_unlock_sock(sk); |
| 1718 | |
Eric Dumazet | e994b2f | 2015-10-02 11:43:39 -0700 | [diff] [blame] | 1719 | put_and_return: |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1720 | if (refcounted) |
| 1721 | sock_put(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | |
| 1723 | return ret; |
| 1724 | |
| 1725 | no_tcp_socket: |
| 1726 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 1727 | goto discard_it; |
| 1728 | |
Eric Dumazet | 12e25e1 | 2015-06-03 23:49:21 -0700 | [diff] [blame] | 1729 | if (tcp_checksum_complete(skb)) { |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1730 | csum_error: |
Eric Dumazet | 90bbcc6 | 2016-04-27 16:44:32 -0700 | [diff] [blame] | 1731 | __TCP_INC_STATS(net, TCP_MIB_CSUMERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | bad_packet: |
Eric Dumazet | 90bbcc6 | 2016-04-27 16:44:32 -0700 | [diff] [blame] | 1733 | __TCP_INC_STATS(net, TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1735 | tcp_v4_send_reset(NULL, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | } |
| 1737 | |
| 1738 | discard_it: |
| 1739 | /* Discard frame. */ |
| 1740 | kfree_skb(skb); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1741 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | |
| 1743 | discard_and_relse: |
Eric Dumazet | 532182c | 2016-04-01 08:52:19 -0700 | [diff] [blame] | 1744 | sk_drops_add(sk, skb); |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1745 | if (refcounted) |
| 1746 | sock_put(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | goto discard_it; |
| 1748 | |
| 1749 | do_time_wait: |
| 1750 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1751 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1752 | goto discard_it; |
| 1753 | } |
| 1754 | |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1755 | if (tcp_checksum_complete(skb)) { |
| 1756 | inet_twsk_put(inet_twsk(sk)); |
| 1757 | goto csum_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1758 | } |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1759 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1760 | case TCP_TW_SYN: { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1761 | struct sock *sk2 = inet_lookup_listener(dev_net(skb->dev), |
Craig Gallek | a583636 | 2016-02-10 11:50:38 -0500 | [diff] [blame] | 1762 | &tcp_hashinfo, skb, |
| 1763 | __tcp_hdrlen(th), |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 1764 | iph->saddr, th->source, |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1765 | iph->daddr, th->dest, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1766 | inet_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1767 | if (sk2) { |
Eric Dumazet | dbe7faa | 2015-07-08 14:28:30 -0700 | [diff] [blame] | 1768 | inet_twsk_deschedule_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1769 | sk = sk2; |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1770 | refcounted = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1771 | goto process; |
| 1772 | } |
| 1773 | /* Fall through to ACK */ |
| 1774 | } |
| 1775 | case TCP_TW_ACK: |
| 1776 | tcp_v4_timewait_ack(sk, skb); |
| 1777 | break; |
| 1778 | case TCP_TW_RST: |
Florian Westphal | 271c3b9 | 2015-12-21 21:29:26 +0100 | [diff] [blame] | 1779 | tcp_v4_send_reset(sk, skb); |
| 1780 | inet_twsk_deschedule_put(inet_twsk(sk)); |
| 1781 | goto discard_it; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | case TCP_TW_SUCCESS:; |
| 1783 | } |
| 1784 | goto discard_it; |
| 1785 | } |
| 1786 | |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1787 | static struct timewait_sock_ops tcp_timewait_sock_ops = { |
| 1788 | .twsk_obj_size = sizeof(struct tcp_timewait_sock), |
| 1789 | .twsk_unique = tcp_twsk_unique, |
| 1790 | .twsk_destructor= tcp_twsk_destructor, |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1791 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1792 | |
Eric Dumazet | 63d02d1 | 2012-08-09 14:11:00 +0000 | [diff] [blame] | 1793 | 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] | 1794 | { |
| 1795 | struct dst_entry *dst = skb_dst(skb); |
| 1796 | |
Eric Dumazet | 5037e9e | 2015-12-14 14:08:53 -0800 | [diff] [blame] | 1797 | if (dst && dst_hold_safe(dst)) { |
Eric Dumazet | ca777ef | 2014-09-08 08:06:07 -0700 | [diff] [blame] | 1798 | sk->sk_rx_dst = dst; |
| 1799 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; |
| 1800 | } |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 1801 | } |
Eric Dumazet | 63d02d1 | 2012-08-09 14:11:00 +0000 | [diff] [blame] | 1802 | EXPORT_SYMBOL(inet_sk_rx_dst_set); |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 1803 | |
Stephen Hemminger | 3b401a8 | 2009-09-01 19:25:04 +0000 | [diff] [blame] | 1804 | const struct inet_connection_sock_af_ops ipv4_specific = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1805 | .queue_xmit = ip_queue_xmit, |
| 1806 | .send_check = tcp_v4_send_check, |
| 1807 | .rebuild_header = inet_sk_rebuild_header, |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 1808 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1809 | .conn_request = tcp_v4_conn_request, |
| 1810 | .syn_recv_sock = tcp_v4_syn_recv_sock, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1811 | .net_header_len = sizeof(struct iphdr), |
| 1812 | .setsockopt = ip_setsockopt, |
| 1813 | .getsockopt = ip_getsockopt, |
| 1814 | .addr2sockaddr = inet_csk_addr2sockaddr, |
| 1815 | .sockaddr_len = sizeof(struct sockaddr_in), |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1816 | .bind_conflict = inet_csk_bind_conflict, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1817 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1818 | .compat_setsockopt = compat_ip_setsockopt, |
| 1819 | .compat_getsockopt = compat_ip_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1820 | #endif |
Neal Cardwell | 4fab907 | 2014-08-14 12:40:05 -0400 | [diff] [blame] | 1821 | .mtu_reduced = tcp_v4_mtu_reduced, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1822 | }; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1823 | EXPORT_SYMBOL(ipv4_specific); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1825 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 1826 | static const struct tcp_sock_af_ops tcp_sock_ipv4_specific = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1827 | .md5_lookup = tcp_v4_md5_lookup, |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1828 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1829 | .md5_parse = tcp_v4_parse_md5_keys, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1830 | }; |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 1831 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1832 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | /* NOTE: A lot of things set to zero explicitly by call to |
| 1834 | * sk_alloc() so need not be done here. |
| 1835 | */ |
| 1836 | static int tcp_v4_init_sock(struct sock *sk) |
| 1837 | { |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1838 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1839 | |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 1840 | tcp_init_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1842 | icsk->icsk_af_ops = &ipv4_specific; |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 1843 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1844 | #ifdef CONFIG_TCP_MD5SIG |
David S. Miller | ac807fa | 2012-04-23 03:21:58 -0400 | [diff] [blame] | 1845 | tcp_sk(sk)->af_specific = &tcp_sock_ipv4_specific; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1846 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1847 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1848 | return 0; |
| 1849 | } |
| 1850 | |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 1851 | void tcp_v4_destroy_sock(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1852 | { |
| 1853 | struct tcp_sock *tp = tcp_sk(sk); |
| 1854 | |
| 1855 | tcp_clear_xmit_timers(sk); |
| 1856 | |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1857 | tcp_cleanup_congestion_control(sk); |
Stephen Hemminger | 317a76f | 2005-06-23 12:19:55 -0700 | [diff] [blame] | 1858 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1859 | /* Cleanup up the write buffer. */ |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 1860 | tcp_write_queue_purge(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1861 | |
| 1862 | /* Cleans up our, hopefully empty, out_of_order_queue. */ |
Yaogong Wang | 9f5afea | 2016-09-07 14:49:28 -0700 | [diff] [blame] | 1863 | skb_rbtree_purge(&tp->out_of_order_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1864 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1865 | #ifdef CONFIG_TCP_MD5SIG |
| 1866 | /* Clean up the MD5 key list, if any */ |
| 1867 | if (tp->md5sig_info) { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1868 | tcp_clear_md5_list(sk); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1869 | kfree_rcu(tp->md5sig_info, rcu); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1870 | tp->md5sig_info = NULL; |
| 1871 | } |
| 1872 | #endif |
| 1873 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | /* Clean prequeue, it must be empty really */ |
| 1875 | __skb_queue_purge(&tp->ucopy.prequeue); |
| 1876 | |
| 1877 | /* Clean up a referenced TCP bind bucket. */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1878 | if (inet_csk(sk)->icsk_bind_hash) |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1879 | inet_put_port(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1880 | |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 1881 | BUG_ON(tp->fastopen_rsk); |
William Allen Simpson | 435cf55 | 2009-12-02 18:17:05 +0000 | [diff] [blame] | 1882 | |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1883 | /* If socket is aborted during connect operation */ |
| 1884 | tcp_free_fastopen_req(tp); |
Eric Dumazet | cd8ae85 | 2015-05-03 21:34:46 -0700 | [diff] [blame] | 1885 | tcp_saved_syn_free(tp); |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1886 | |
Eric Dumazet | 777c6ae | 2016-05-04 15:27:29 -0700 | [diff] [blame] | 1887 | local_bh_disable(); |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1888 | sk_sockets_allocated_dec(sk); |
Eric Dumazet | 777c6ae | 2016-05-04 15:27:29 -0700 | [diff] [blame] | 1889 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1891 | EXPORT_SYMBOL(tcp_v4_destroy_sock); |
| 1892 | |
| 1893 | #ifdef CONFIG_PROC_FS |
| 1894 | /* Proc filesystem TCP sock list dumping. */ |
| 1895 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1896 | /* |
| 1897 | * Get next listener socket follow cur. If cur is NULL, get first socket |
| 1898 | * starting from bucket given in st->bucket; when st->bucket is zero the |
| 1899 | * very first socket in the hash table is returned. |
| 1900 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | static void *listening_get_next(struct seq_file *seq, void *cur) |
| 1902 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 1903 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 1904 | struct net *net = seq_file_net(seq); |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1905 | struct inet_listen_hashbucket *ilb; |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1906 | struct sock *sk = cur; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1907 | |
| 1908 | if (!sk) { |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1909 | get_head: |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1910 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 1911 | spin_lock_bh(&ilb->lock); |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1912 | sk = sk_head(&ilb->head); |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1913 | st->offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | goto get_sk; |
| 1915 | } |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 1916 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1917 | ++st->num; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1918 | ++st->offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1919 | |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1920 | sk = sk_next(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1921 | get_sk: |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1922 | sk_for_each_from(sk) { |
Pavel Emelyanov | 8475ef9 | 2010-11-22 03:26:12 +0000 | [diff] [blame] | 1923 | if (!net_eq(sock_net(sk), net)) |
| 1924 | continue; |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1925 | if (sk->sk_family == st->family) |
| 1926 | return sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1927 | } |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 1928 | spin_unlock_bh(&ilb->lock); |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1929 | st->offset = 0; |
Eric Dumazet | 3b24d85 | 2016-04-01 08:52:17 -0700 | [diff] [blame] | 1930 | if (++st->bucket < INET_LHTABLE_SIZE) |
| 1931 | goto get_head; |
| 1932 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1933 | } |
| 1934 | |
| 1935 | static void *listening_get_idx(struct seq_file *seq, loff_t *pos) |
| 1936 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1937 | struct tcp_iter_state *st = seq->private; |
| 1938 | void *rc; |
| 1939 | |
| 1940 | st->bucket = 0; |
| 1941 | st->offset = 0; |
| 1942 | rc = listening_get_next(seq, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1943 | |
| 1944 | while (rc && *pos) { |
| 1945 | rc = listening_get_next(seq, rc); |
| 1946 | --*pos; |
| 1947 | } |
| 1948 | return rc; |
| 1949 | } |
| 1950 | |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 1951 | static inline bool empty_bucket(const struct tcp_iter_state *st) |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 1952 | { |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 1953 | return hlist_nulls_empty(&tcp_hashinfo.ehash[st->bucket].chain); |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 1954 | } |
| 1955 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1956 | /* |
| 1957 | * Get first established socket starting from bucket given in st->bucket. |
| 1958 | * If st->bucket is zero, the very first socket in the hash is returned. |
| 1959 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | static void *established_get_first(struct seq_file *seq) |
| 1961 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 1962 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 1963 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1964 | void *rc = NULL; |
| 1965 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1966 | st->offset = 0; |
| 1967 | for (; st->bucket <= tcp_hashinfo.ehash_mask; ++st->bucket) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1968 | struct sock *sk; |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 1969 | struct hlist_nulls_node *node; |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 1970 | spinlock_t *lock = inet_ehash_lockp(&tcp_hashinfo, st->bucket); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1971 | |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 1972 | /* Lockless fast path for the common case of empty buckets */ |
| 1973 | if (empty_bucket(st)) |
| 1974 | continue; |
| 1975 | |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 1976 | spin_lock_bh(lock); |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 1977 | sk_nulls_for_each(sk, node, &tcp_hashinfo.ehash[st->bucket].chain) { |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 1978 | if (sk->sk_family != st->family || |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 1979 | !net_eq(sock_net(sk), net)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1980 | continue; |
| 1981 | } |
| 1982 | rc = sk; |
| 1983 | goto out; |
| 1984 | } |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 1985 | spin_unlock_bh(lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | } |
| 1987 | out: |
| 1988 | return rc; |
| 1989 | } |
| 1990 | |
| 1991 | static void *established_get_next(struct seq_file *seq, void *cur) |
| 1992 | { |
| 1993 | struct sock *sk = cur; |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 1994 | struct hlist_nulls_node *node; |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 1995 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 1996 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | |
| 1998 | ++st->num; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1999 | ++st->offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2000 | |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2001 | sk = sk_nulls_next(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2002 | |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2003 | sk_nulls_for_each_from(sk, node) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2004 | if (sk->sk_family == st->family && net_eq(sock_net(sk), net)) |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2005 | return sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2006 | } |
| 2007 | |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2008 | spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
| 2009 | ++st->bucket; |
| 2010 | return established_get_first(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2011 | } |
| 2012 | |
| 2013 | static void *established_get_idx(struct seq_file *seq, loff_t pos) |
| 2014 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2015 | struct tcp_iter_state *st = seq->private; |
| 2016 | void *rc; |
| 2017 | |
| 2018 | st->bucket = 0; |
| 2019 | rc = established_get_first(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | |
| 2021 | while (rc && pos) { |
| 2022 | rc = established_get_next(seq, rc); |
| 2023 | --pos; |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 2024 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2025 | return rc; |
| 2026 | } |
| 2027 | |
| 2028 | static void *tcp_get_idx(struct seq_file *seq, loff_t pos) |
| 2029 | { |
| 2030 | void *rc; |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2031 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2032 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2033 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2034 | rc = listening_get_idx(seq, &pos); |
| 2035 | |
| 2036 | if (!rc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
| 2038 | rc = established_get_idx(seq, pos); |
| 2039 | } |
| 2040 | |
| 2041 | return rc; |
| 2042 | } |
| 2043 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2044 | static void *tcp_seek_last_pos(struct seq_file *seq) |
| 2045 | { |
| 2046 | struct tcp_iter_state *st = seq->private; |
| 2047 | int offset = st->offset; |
| 2048 | int orig_num = st->num; |
| 2049 | void *rc = NULL; |
| 2050 | |
| 2051 | switch (st->state) { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2052 | case TCP_SEQ_STATE_LISTENING: |
| 2053 | if (st->bucket >= INET_LHTABLE_SIZE) |
| 2054 | break; |
| 2055 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2056 | rc = listening_get_next(seq, NULL); |
| 2057 | while (offset-- && rc) |
| 2058 | rc = listening_get_next(seq, rc); |
| 2059 | if (rc) |
| 2060 | break; |
| 2061 | st->bucket = 0; |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2062 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2063 | /* Fallthrough */ |
| 2064 | case TCP_SEQ_STATE_ESTABLISHED: |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2065 | if (st->bucket > tcp_hashinfo.ehash_mask) |
| 2066 | break; |
| 2067 | rc = established_get_first(seq); |
| 2068 | while (offset-- && rc) |
| 2069 | rc = established_get_next(seq, rc); |
| 2070 | } |
| 2071 | |
| 2072 | st->num = orig_num; |
| 2073 | |
| 2074 | return rc; |
| 2075 | } |
| 2076 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2077 | static void *tcp_seq_start(struct seq_file *seq, loff_t *pos) |
| 2078 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2079 | struct tcp_iter_state *st = seq->private; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2080 | void *rc; |
| 2081 | |
| 2082 | if (*pos && *pos == st->last_pos) { |
| 2083 | rc = tcp_seek_last_pos(seq); |
| 2084 | if (rc) |
| 2085 | goto out; |
| 2086 | } |
| 2087 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2088 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2089 | st->num = 0; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2090 | st->bucket = 0; |
| 2091 | st->offset = 0; |
| 2092 | rc = *pos ? tcp_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| 2093 | |
| 2094 | out: |
| 2095 | st->last_pos = *pos; |
| 2096 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2097 | } |
| 2098 | |
| 2099 | static void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2100 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2101 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2102 | void *rc = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2103 | |
| 2104 | if (v == SEQ_START_TOKEN) { |
| 2105 | rc = tcp_get_idx(seq, 0); |
| 2106 | goto out; |
| 2107 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2108 | |
| 2109 | switch (st->state) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2110 | case TCP_SEQ_STATE_LISTENING: |
| 2111 | rc = listening_get_next(seq, v); |
| 2112 | if (!rc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2113 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2114 | st->bucket = 0; |
| 2115 | st->offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2116 | rc = established_get_first(seq); |
| 2117 | } |
| 2118 | break; |
| 2119 | case TCP_SEQ_STATE_ESTABLISHED: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2120 | rc = established_get_next(seq, v); |
| 2121 | break; |
| 2122 | } |
| 2123 | out: |
| 2124 | ++*pos; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2125 | st->last_pos = *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2126 | return rc; |
| 2127 | } |
| 2128 | |
| 2129 | static void tcp_seq_stop(struct seq_file *seq, void *v) |
| 2130 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2131 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2132 | |
| 2133 | switch (st->state) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2134 | case TCP_SEQ_STATE_LISTENING: |
| 2135 | if (v != SEQ_START_TOKEN) |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2136 | spin_unlock_bh(&tcp_hashinfo.listening_hash[st->bucket].lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2137 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | case TCP_SEQ_STATE_ESTABLISHED: |
| 2139 | if (v) |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2140 | spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2141 | break; |
| 2142 | } |
| 2143 | } |
| 2144 | |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2145 | int tcp_seq_open(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2146 | { |
Al Viro | d9dda78 | 2013-03-31 18:16:14 -0400 | [diff] [blame] | 2147 | struct tcp_seq_afinfo *afinfo = PDE_DATA(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2148 | struct tcp_iter_state *s; |
Denis V. Lunev | 52d6f3f | 2008-04-13 22:12:41 -0700 | [diff] [blame] | 2149 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2150 | |
Denis V. Lunev | 52d6f3f | 2008-04-13 22:12:41 -0700 | [diff] [blame] | 2151 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
| 2152 | sizeof(struct tcp_iter_state)); |
| 2153 | if (err < 0) |
| 2154 | return err; |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 2155 | |
Denis V. Lunev | 52d6f3f | 2008-04-13 22:12:41 -0700 | [diff] [blame] | 2156 | s = ((struct seq_file *)file->private_data)->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2157 | s->family = afinfo->family; |
stephen hemminger | 688d194 | 2014-08-29 23:32:05 -0700 | [diff] [blame] | 2158 | s->last_pos = 0; |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 2159 | return 0; |
| 2160 | } |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2161 | EXPORT_SYMBOL(tcp_seq_open); |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 2162 | |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2163 | int tcp_proc_register(struct net *net, struct tcp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2164 | { |
| 2165 | int rc = 0; |
| 2166 | struct proc_dir_entry *p; |
| 2167 | |
Denis V. Lunev | 9427c4b | 2008-04-13 22:12:13 -0700 | [diff] [blame] | 2168 | afinfo->seq_ops.start = tcp_seq_start; |
| 2169 | afinfo->seq_ops.next = tcp_seq_next; |
| 2170 | afinfo->seq_ops.stop = tcp_seq_stop; |
| 2171 | |
Denis V. Lunev | 84841c3 | 2008-05-02 04:10:08 -0700 | [diff] [blame] | 2172 | 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] | 2173 | afinfo->seq_fops, afinfo); |
Denis V. Lunev | 84841c3 | 2008-05-02 04:10:08 -0700 | [diff] [blame] | 2174 | if (!p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2175 | rc = -ENOMEM; |
| 2176 | return rc; |
| 2177 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2178 | EXPORT_SYMBOL(tcp_proc_register); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2179 | |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2180 | void tcp_proc_unregister(struct net *net, struct tcp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | { |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 2182 | remove_proc_entry(afinfo->name, net->proc_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2183 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2184 | EXPORT_SYMBOL(tcp_proc_unregister); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2185 | |
Eric Dumazet | d4f0687 | 2015-03-12 16:44:09 -0700 | [diff] [blame] | 2186 | static void get_openreq4(const struct request_sock *req, |
Eric Dumazet | aa3a0c8 | 2015-10-02 11:43:30 -0700 | [diff] [blame] | 2187 | struct seq_file *f, int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2188 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2189 | const struct inet_request_sock *ireq = inet_rsk(req); |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 2190 | long delta = req->rsk_timer.expires - jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2192 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2193 | " %02X %08X:%08X %02X:%08lX %08X %5u %8d %u %d %pK", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2194 | i, |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 2195 | ireq->ir_loc_addr, |
Eric Dumazet | d4f0687 | 2015-03-12 16:44:09 -0700 | [diff] [blame] | 2196 | ireq->ir_num, |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 2197 | ireq->ir_rmt_addr, |
| 2198 | ntohs(ireq->ir_rmt_port), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2199 | TCP_SYN_RECV, |
| 2200 | 0, 0, /* could print option size, but that is af dependent. */ |
| 2201 | 1, /* timers active (only the expire timer) */ |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2202 | jiffies_delta_to_clock_t(delta), |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 2203 | req->num_timeout, |
Eric Dumazet | aa3a0c8 | 2015-10-02 11:43:30 -0700 | [diff] [blame] | 2204 | from_kuid_munged(seq_user_ns(f), |
| 2205 | sock_i_uid(req->rsk_listener)), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2206 | 0, /* non standard timer */ |
| 2207 | 0, /* open_requests have no inode */ |
Eric Dumazet | d4f0687 | 2015-03-12 16:44:09 -0700 | [diff] [blame] | 2208 | 0, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2209 | req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2210 | } |
| 2211 | |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2212 | 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] | 2213 | { |
| 2214 | int timer_active; |
| 2215 | unsigned long timer_expires; |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2216 | const struct tcp_sock *tp = tcp_sk(sk); |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2217 | const struct inet_connection_sock *icsk = inet_csk(sk); |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2218 | const struct inet_sock *inet = inet_sk(sk); |
Eric Dumazet | 0536fcc | 2015-09-29 07:42:52 -0700 | [diff] [blame] | 2219 | const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 2220 | __be32 dest = inet->inet_daddr; |
| 2221 | __be32 src = inet->inet_rcv_saddr; |
| 2222 | __u16 destp = ntohs(inet->inet_dport); |
| 2223 | __u16 srcp = ntohs(inet->inet_sport); |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2224 | int rx_queue; |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2225 | int state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2226 | |
Nandita Dukkipati | 6ba8a3b | 2013-03-11 10:00:43 +0000 | [diff] [blame] | 2227 | if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
| 2228 | icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS || |
| 2229 | icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2230 | timer_active = 1; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2231 | timer_expires = icsk->icsk_timeout; |
| 2232 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2233 | timer_active = 4; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2234 | timer_expires = icsk->icsk_timeout; |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2235 | } else if (timer_pending(&sk->sk_timer)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2236 | timer_active = 2; |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2237 | timer_expires = sk->sk_timer.expires; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2238 | } else { |
| 2239 | timer_active = 0; |
| 2240 | timer_expires = jiffies; |
| 2241 | } |
| 2242 | |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2243 | state = sk_state_load(sk); |
| 2244 | if (state == TCP_LISTEN) |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2245 | rx_queue = sk->sk_ack_backlog; |
| 2246 | else |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2247 | /* Because we don't lock the socket, |
| 2248 | * we might find a transient negative value. |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2249 | */ |
| 2250 | rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); |
| 2251 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2252 | 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] | 2253 | "%08X %5u %8d %lu %d %pK %lu %lu %u %u %d", |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2254 | i, src, srcp, dest, destp, state, |
Sridhar Samudrala | 47da8ee | 2006-06-27 13:29:00 -0700 | [diff] [blame] | 2255 | tp->write_seq - tp->snd_una, |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2256 | rx_queue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2257 | timer_active, |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2258 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2259 | icsk->icsk_retransmits, |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 2260 | 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] | 2261 | icsk->icsk_probes_out, |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2262 | sock_i_ino(sk), |
| 2263 | atomic_read(&sk->sk_refcnt), sk, |
Stephen Hemminger | 7be8735 | 2008-06-27 20:00:19 -0700 | [diff] [blame] | 2264 | jiffies_to_clock_t(icsk->icsk_rto), |
| 2265 | jiffies_to_clock_t(icsk->icsk_ack.ato), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2266 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2267 | tp->snd_cwnd, |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2268 | state == TCP_LISTEN ? |
| 2269 | fastopenq->max_qlen : |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2270 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2271 | } |
| 2272 | |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2273 | static void get_timewait4_sock(const struct inet_timewait_sock *tw, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2274 | struct seq_file *f, int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2275 | { |
Eric Dumazet | 789f558 | 2015-04-12 18:51:09 -0700 | [diff] [blame] | 2276 | long delta = tw->tw_timer.expires - jiffies; |
Al Viro | 23f33c2 | 2006-09-27 18:43:50 -0700 | [diff] [blame] | 2277 | __be32 dest, src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2278 | __u16 destp, srcp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2279 | |
| 2280 | dest = tw->tw_daddr; |
| 2281 | src = tw->tw_rcv_saddr; |
| 2282 | destp = ntohs(tw->tw_dport); |
| 2283 | srcp = ntohs(tw->tw_sport); |
| 2284 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2285 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2286 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2287 | i, src, srcp, dest, destp, tw->tw_substate, 0, 0, |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2288 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2289 | atomic_read(&tw->tw_refcnt), tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2290 | } |
| 2291 | |
| 2292 | #define TMPSZ 150 |
| 2293 | |
| 2294 | static int tcp4_seq_show(struct seq_file *seq, void *v) |
| 2295 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2296 | struct tcp_iter_state *st; |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 2297 | struct sock *sk = v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2298 | |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2299 | seq_setwidth(seq, TMPSZ - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2300 | if (v == SEQ_START_TOKEN) { |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2301 | seq_puts(seq, " sl local_address rem_address st tx_queue " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2302 | "rx_queue tr tm->when retrnsmt uid timeout " |
| 2303 | "inode"); |
| 2304 | goto out; |
| 2305 | } |
| 2306 | st = seq->private; |
| 2307 | |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 2308 | if (sk->sk_state == TCP_TIME_WAIT) |
| 2309 | get_timewait4_sock(v, seq, st->num); |
| 2310 | else if (sk->sk_state == TCP_NEW_SYN_RECV) |
Eric Dumazet | aa3a0c8 | 2015-10-02 11:43:30 -0700 | [diff] [blame] | 2311 | get_openreq4(v, seq, st->num); |
Eric Dumazet | 079096f | 2015-10-02 11:43:32 -0700 | [diff] [blame] | 2312 | else |
| 2313 | get_tcp4_sock(v, seq, st->num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2314 | out: |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2315 | seq_pad(seq, '\n'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2316 | return 0; |
| 2317 | } |
| 2318 | |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2319 | static const struct file_operations tcp_afinfo_seq_fops = { |
| 2320 | .owner = THIS_MODULE, |
| 2321 | .open = tcp_seq_open, |
| 2322 | .read = seq_read, |
| 2323 | .llseek = seq_lseek, |
| 2324 | .release = seq_release_net |
| 2325 | }; |
| 2326 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2327 | static struct tcp_seq_afinfo tcp4_seq_afinfo = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | .name = "tcp", |
| 2329 | .family = AF_INET, |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2330 | .seq_fops = &tcp_afinfo_seq_fops, |
Denis V. Lunev | 9427c4b | 2008-04-13 22:12:13 -0700 | [diff] [blame] | 2331 | .seq_ops = { |
| 2332 | .show = tcp4_seq_show, |
| 2333 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2334 | }; |
| 2335 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2336 | static int __net_init tcp4_proc_init_net(struct net *net) |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2337 | { |
| 2338 | return tcp_proc_register(net, &tcp4_seq_afinfo); |
| 2339 | } |
| 2340 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2341 | static void __net_exit tcp4_proc_exit_net(struct net *net) |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2342 | { |
| 2343 | tcp_proc_unregister(net, &tcp4_seq_afinfo); |
| 2344 | } |
| 2345 | |
| 2346 | static struct pernet_operations tcp4_net_ops = { |
| 2347 | .init = tcp4_proc_init_net, |
| 2348 | .exit = tcp4_proc_exit_net, |
| 2349 | }; |
| 2350 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2351 | int __init tcp4_proc_init(void) |
| 2352 | { |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2353 | return register_pernet_subsys(&tcp4_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2354 | } |
| 2355 | |
| 2356 | void tcp4_proc_exit(void) |
| 2357 | { |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2358 | unregister_pernet_subsys(&tcp4_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2359 | } |
| 2360 | #endif /* CONFIG_PROC_FS */ |
| 2361 | |
| 2362 | struct proto tcp_prot = { |
| 2363 | .name = "TCP", |
| 2364 | .owner = THIS_MODULE, |
| 2365 | .close = tcp_close, |
| 2366 | .connect = tcp_v4_connect, |
| 2367 | .disconnect = tcp_disconnect, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2368 | .accept = inet_csk_accept, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2369 | .ioctl = tcp_ioctl, |
| 2370 | .init = tcp_v4_init_sock, |
| 2371 | .destroy = tcp_v4_destroy_sock, |
| 2372 | .shutdown = tcp_shutdown, |
| 2373 | .setsockopt = tcp_setsockopt, |
| 2374 | .getsockopt = tcp_getsockopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2375 | .recvmsg = tcp_recvmsg, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 2376 | .sendmsg = tcp_sendmsg, |
| 2377 | .sendpage = tcp_sendpage, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2378 | .backlog_rcv = tcp_v4_do_rcv, |
Eric Dumazet | 46d3cea | 2012-07-11 05:50:31 +0000 | [diff] [blame] | 2379 | .release_cb = tcp_release_cb, |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 2380 | .hash = inet_hash, |
| 2381 | .unhash = inet_unhash, |
| 2382 | .get_port = inet_csk_get_port, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2383 | .enter_memory_pressure = tcp_enter_memory_pressure, |
Eric Dumazet | c9bee3b7 | 2013-07-22 20:27:07 -0700 | [diff] [blame] | 2384 | .stream_memory_free = tcp_stream_memory_free, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2385 | .sockets_allocated = &tcp_sockets_allocated, |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 2386 | .orphan_count = &tcp_orphan_count, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2387 | .memory_allocated = &tcp_memory_allocated, |
| 2388 | .memory_pressure = &tcp_memory_pressure, |
Eric W. Biederman | a4fe34b | 2013-10-19 16:25:36 -0700 | [diff] [blame] | 2389 | .sysctl_mem = sysctl_tcp_mem, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2390 | .sysctl_wmem = sysctl_tcp_wmem, |
| 2391 | .sysctl_rmem = sysctl_tcp_rmem, |
| 2392 | .max_header = MAX_TCP_HEADER, |
| 2393 | .obj_size = sizeof(struct tcp_sock), |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2394 | .slab_flags = SLAB_DESTROY_BY_RCU, |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2395 | .twsk_prot = &tcp_timewait_sock_ops, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 2396 | .rsk_prot = &tcp_request_sock_ops, |
Pavel Emelyanov | 39d8cda | 2008-03-22 16:50:58 -0700 | [diff] [blame] | 2397 | .h.hashinfo = &tcp_hashinfo, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 2398 | .no_autobind = true, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2399 | #ifdef CONFIG_COMPAT |
| 2400 | .compat_setsockopt = compat_tcp_setsockopt, |
| 2401 | .compat_getsockopt = compat_tcp_getsockopt, |
| 2402 | #endif |
Lorenzo Colitti | c1e64e2 | 2015-12-16 12:30:05 +0900 | [diff] [blame] | 2403 | .diag_destroy = tcp_abort, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2404 | }; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2405 | EXPORT_SYMBOL(tcp_prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2406 | |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2407 | static void __net_exit tcp_sk_exit(struct net *net) |
| 2408 | { |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 2409 | int cpu; |
| 2410 | |
| 2411 | for_each_possible_cpu(cpu) |
| 2412 | inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv4.tcp_sk, cpu)); |
| 2413 | free_percpu(net->ipv4.tcp_sk); |
| 2414 | } |
| 2415 | |
| 2416 | static int __net_init tcp_sk_init(struct net *net) |
| 2417 | { |
| 2418 | int res, cpu; |
| 2419 | |
| 2420 | net->ipv4.tcp_sk = alloc_percpu(struct sock *); |
| 2421 | if (!net->ipv4.tcp_sk) |
| 2422 | return -ENOMEM; |
| 2423 | |
| 2424 | for_each_possible_cpu(cpu) { |
| 2425 | struct sock *sk; |
| 2426 | |
| 2427 | res = inet_ctl_sock_create(&sk, PF_INET, SOCK_RAW, |
| 2428 | IPPROTO_TCP, net); |
| 2429 | if (res) |
| 2430 | goto fail; |
Eric Dumazet | a9d6532 | 2016-04-01 08:52:21 -0700 | [diff] [blame] | 2431 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 2432 | *per_cpu_ptr(net->ipv4.tcp_sk, cpu) = sk; |
| 2433 | } |
Daniel Borkmann | 4921355 | 2015-05-19 21:04:22 +0200 | [diff] [blame] | 2434 | |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 2435 | net->ipv4.sysctl_tcp_ecn = 2; |
Daniel Borkmann | 4921355 | 2015-05-19 21:04:22 +0200 | [diff] [blame] | 2436 | net->ipv4.sysctl_tcp_ecn_fallback = 1; |
| 2437 | |
Fan Du | b0f9ca5 | 2015-02-10 09:53:16 +0800 | [diff] [blame] | 2438 | net->ipv4.sysctl_tcp_base_mss = TCP_BASE_MSS; |
Fan Du | 6b58e0a | 2015-03-06 11:18:23 +0800 | [diff] [blame] | 2439 | net->ipv4.sysctl_tcp_probe_threshold = TCP_PROBE_THRESHOLD; |
Fan Du | 05cbc0d | 2015-03-06 11:18:24 +0800 | [diff] [blame] | 2440 | net->ipv4.sysctl_tcp_probe_interval = TCP_PROBE_INTERVAL; |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 2441 | |
Nikolay Borisov | 13b287e | 2016-01-07 16:38:43 +0200 | [diff] [blame] | 2442 | net->ipv4.sysctl_tcp_keepalive_time = TCP_KEEPALIVE_TIME; |
Nikolay Borisov | 9bd6861 | 2016-01-07 16:38:44 +0200 | [diff] [blame] | 2443 | net->ipv4.sysctl_tcp_keepalive_probes = TCP_KEEPALIVE_PROBES; |
Nikolay Borisov | b840d15 | 2016-01-07 16:38:45 +0200 | [diff] [blame] | 2444 | net->ipv4.sysctl_tcp_keepalive_intvl = TCP_KEEPALIVE_INTVL; |
Nikolay Borisov | 13b287e | 2016-01-07 16:38:43 +0200 | [diff] [blame] | 2445 | |
Nikolay Borisov | 6fa2516 | 2016-02-03 09:46:49 +0200 | [diff] [blame] | 2446 | net->ipv4.sysctl_tcp_syn_retries = TCP_SYN_RETRIES; |
Nikolay Borisov | 7c083ec | 2016-02-03 09:46:50 +0200 | [diff] [blame] | 2447 | net->ipv4.sysctl_tcp_synack_retries = TCP_SYNACK_RETRIES; |
David S. Miller | 0aca737 | 2016-02-08 04:24:33 -0500 | [diff] [blame] | 2448 | net->ipv4.sysctl_tcp_syncookies = 1; |
Nikolay Borisov | 1043e25 | 2016-02-03 09:46:52 +0200 | [diff] [blame] | 2449 | net->ipv4.sysctl_tcp_reordering = TCP_FASTRETRANS_THRESH; |
Nikolay Borisov | ae5c3f4 | 2016-02-03 09:46:53 +0200 | [diff] [blame] | 2450 | net->ipv4.sysctl_tcp_retries1 = TCP_RETR1; |
Nikolay Borisov | c6214a9 | 2016-02-03 09:46:54 +0200 | [diff] [blame] | 2451 | net->ipv4.sysctl_tcp_retries2 = TCP_RETR2; |
Nikolay Borisov | c402d9b | 2016-02-03 09:46:55 +0200 | [diff] [blame] | 2452 | net->ipv4.sysctl_tcp_orphan_retries = 0; |
Nikolay Borisov | 1e579ca | 2016-02-03 09:46:56 +0200 | [diff] [blame] | 2453 | net->ipv4.sysctl_tcp_fin_timeout = TCP_FIN_TIMEOUT; |
Nikolay Borisov | 4979f2d | 2016-02-03 09:46:57 +0200 | [diff] [blame] | 2454 | net->ipv4.sysctl_tcp_notsent_lowat = UINT_MAX; |
Nikolay Borisov | 12ed824 | 2016-02-03 09:46:51 +0200 | [diff] [blame] | 2455 | |
Daniel Borkmann | 4921355 | 2015-05-19 21:04:22 +0200 | [diff] [blame] | 2456 | return 0; |
Eric Dumazet | bdbbb85 | 2015-01-29 21:35:05 -0800 | [diff] [blame] | 2457 | fail: |
| 2458 | tcp_sk_exit(net); |
| 2459 | |
| 2460 | return res; |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 2461 | } |
| 2462 | |
| 2463 | static void __net_exit tcp_sk_exit_batch(struct list_head *net_exit_list) |
| 2464 | { |
| 2465 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET); |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2466 | } |
| 2467 | |
| 2468 | static struct pernet_operations __net_initdata tcp_sk_ops = { |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 2469 | .init = tcp_sk_init, |
| 2470 | .exit = tcp_sk_exit, |
| 2471 | .exit_batch = tcp_sk_exit_batch, |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2472 | }; |
| 2473 | |
Denis V. Lunev | 9b0f976 | 2008-02-29 11:13:15 -0800 | [diff] [blame] | 2474 | void __init tcp_v4_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2475 | { |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2476 | inet_hashinfo_init(&tcp_hashinfo); |
Eric W. Biederman | 6a1b305 | 2009-02-22 00:10:18 -0800 | [diff] [blame] | 2477 | if (register_pernet_subsys(&tcp_sk_ops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2478 | panic("Failed to create the TCP control socket.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2479 | } |