Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * Implementation of the Transmission Control Protocol(TCP). |
| 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * IPv4 specific functions |
| 9 | * |
| 10 | * |
| 11 | * code split from: |
| 12 | * linux/ipv4/tcp.c |
| 13 | * linux/ipv4/tcp_input.c |
| 14 | * linux/ipv4/tcp_output.c |
| 15 | * |
| 16 | * See tcp.c for author information |
| 17 | * |
| 18 | * This program is free software; you can redistribute it and/or |
| 19 | * modify it under the terms of the GNU General Public License |
| 20 | * as published by the Free Software Foundation; either version |
| 21 | * 2 of the License, or (at your option) any later version. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * Changes: |
| 26 | * David S. Miller : New socket lookup architecture. |
| 27 | * This code is dedicated to John Dyson. |
| 28 | * David S. Miller : Change semantics of established hash, |
| 29 | * half is devoted to TIME_WAIT sockets |
| 30 | * and the rest go in the other half. |
| 31 | * Andi Kleen : Add support for syncookies and fixed |
| 32 | * some bugs: ip options weren't passed to |
| 33 | * the TCP layer, missed a check for an |
| 34 | * ACK bit. |
| 35 | * Andi Kleen : Implemented fast path mtu discovery. |
| 36 | * Fixed many serious bugs in the |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 37 | * request_sock handling and moved |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | * most of it into the af independent code. |
| 39 | * Added tail drop and some other bugfixes. |
Stephen Hemminger | caa20d9a | 2005-11-10 17:13:47 -0800 | [diff] [blame] | 40 | * Added new listen semantics. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | * Mike McLagan : Routing by source |
| 42 | * Juan Jose Ciarlante: ip_dynaddr bits |
| 43 | * Andi Kleen: various fixes. |
| 44 | * Vitaly E. Lavrov : Transparent proxy revived after year |
| 45 | * coma. |
| 46 | * Andi Kleen : Fix new listen. |
| 47 | * Andi Kleen : Fix accept error reporting. |
| 48 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which |
| 49 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind |
| 50 | * a single port at the same time. |
| 51 | */ |
| 52 | |
Joe Perches | afd46503 | 2012-03-12 07:03:32 +0000 | [diff] [blame] | 53 | #define pr_fmt(fmt) "TCP: " fmt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
Herbert Xu | eb4dea5 | 2008-12-29 23:04:08 -0800 | [diff] [blame] | 55 | #include <linux/bottom_half.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #include <linux/types.h> |
| 57 | #include <linux/fcntl.h> |
| 58 | #include <linux/module.h> |
| 59 | #include <linux/random.h> |
| 60 | #include <linux/cache.h> |
| 61 | #include <linux/jhash.h> |
| 62 | #include <linux/init.h> |
| 63 | #include <linux/times.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 64 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 66 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | #include <net/icmp.h> |
Arnaldo Carvalho de Melo | 304a161 | 2005-08-09 19:59:20 -0700 | [diff] [blame] | 68 | #include <net/inet_hashtables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | #include <net/tcp.h> |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 70 | #include <net/transp_v6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | #include <net/ipv6.h> |
| 72 | #include <net/inet_common.h> |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 73 | #include <net/timewait_sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | #include <net/xfrm.h> |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 75 | #include <net/netdma.h> |
David S. Miller | 6e5714e | 2011-08-03 20:50:44 -0700 | [diff] [blame] | 76 | #include <net/secure_seq.h> |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 77 | #include <net/tcp_memcontrol.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
| 79 | #include <linux/inet.h> |
| 80 | #include <linux/ipv6.h> |
| 81 | #include <linux/stddef.h> |
| 82 | #include <linux/proc_fs.h> |
| 83 | #include <linux/seq_file.h> |
| 84 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 85 | #include <linux/crypto.h> |
| 86 | #include <linux/scatterlist.h> |
| 87 | |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 88 | int sysctl_tcp_tw_reuse __read_mostly; |
| 89 | int sysctl_tcp_low_latency __read_mostly; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 90 | EXPORT_SYMBOL(sysctl_tcp_low_latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 93 | #ifdef CONFIG_TCP_MD5SIG |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 94 | 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] | 95 | __be32 daddr, __be32 saddr, const struct tcphdr *th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 96 | #endif |
| 97 | |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 98 | struct inet_hashinfo tcp_hashinfo; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 99 | EXPORT_SYMBOL(tcp_hashinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 101 | static inline __u32 tcp_v4_init_sequence(const struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 103 | return secure_tcp_sequence_number(ip_hdr(skb)->daddr, |
| 104 | ip_hdr(skb)->saddr, |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 105 | tcp_hdr(skb)->dest, |
| 106 | tcp_hdr(skb)->source); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | } |
| 108 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 109 | int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp) |
| 110 | { |
| 111 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sktw); |
| 112 | struct tcp_sock *tp = tcp_sk(sk); |
| 113 | |
| 114 | /* With PAWS, it is safe from the viewpoint |
| 115 | of data integrity. Even without PAWS it is safe provided sequence |
| 116 | spaces do not overlap i.e. at data rates <= 80Mbit/sec. |
| 117 | |
| 118 | Actually, the idea is close to VJ's one, only timestamp cache is |
| 119 | held not per host, but per port pair and TW bucket is used as state |
| 120 | holder. |
| 121 | |
| 122 | If TW bucket has been already destroyed we fall back to VJ's scheme |
| 123 | and use initial timestamp retrieved from peer table. |
| 124 | */ |
| 125 | if (tcptw->tw_ts_recent_stamp && |
| 126 | (twp == NULL || (sysctl_tcp_tw_reuse && |
James Morris | 9d729f7 | 2007-03-04 16:12:44 -0800 | [diff] [blame] | 127 | get_seconds() - tcptw->tw_ts_recent_stamp > 1))) { |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 128 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; |
| 129 | if (tp->write_seq == 0) |
| 130 | tp->write_seq = 1; |
| 131 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; |
| 132 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; |
| 133 | sock_hold(sktw); |
| 134 | return 1; |
| 135 | } |
| 136 | |
| 137 | return 0; |
| 138 | } |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 139 | EXPORT_SYMBOL_GPL(tcp_twsk_unique); |
| 140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | /* This will initiate an outgoing connection. */ |
| 142 | int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
| 143 | { |
David S. Miller | 2d7192d | 2011-04-26 13:28:44 -0700 | [diff] [blame] | 144 | struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | struct inet_sock *inet = inet_sk(sk); |
| 146 | struct tcp_sock *tp = tcp_sk(sk); |
David S. Miller | dca8b08 | 2011-02-24 13:38:12 -0800 | [diff] [blame] | 147 | __be16 orig_sport, orig_dport; |
Al Viro | bada8ad | 2006-09-26 21:27:15 -0700 | [diff] [blame] | 148 | __be32 daddr, nexthop; |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 149 | struct flowi4 *fl4; |
David S. Miller | 2d7192d | 2011-04-26 13:28:44 -0700 | [diff] [blame] | 150 | struct rtable *rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | int err; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 152 | struct ip_options_rcu *inet_opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
| 154 | if (addr_len < sizeof(struct sockaddr_in)) |
| 155 | return -EINVAL; |
| 156 | |
| 157 | if (usin->sin_family != AF_INET) |
| 158 | return -EAFNOSUPPORT; |
| 159 | |
| 160 | nexthop = daddr = usin->sin_addr.s_addr; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 161 | inet_opt = rcu_dereference_protected(inet->inet_opt, |
| 162 | sock_owned_by_user(sk)); |
| 163 | if (inet_opt && inet_opt->opt.srr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | if (!daddr) |
| 165 | return -EINVAL; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 166 | nexthop = inet_opt->opt.faddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | } |
| 168 | |
David S. Miller | dca8b08 | 2011-02-24 13:38:12 -0800 | [diff] [blame] | 169 | orig_sport = inet->inet_sport; |
| 170 | orig_dport = usin->sin_port; |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 171 | fl4 = &inet->cork.fl.u.ip4; |
| 172 | rt = ip_route_connect(fl4, nexthop, inet->inet_saddr, |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 173 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, |
| 174 | IPPROTO_TCP, |
| 175 | orig_sport, orig_dport, sk, true); |
| 176 | if (IS_ERR(rt)) { |
| 177 | err = PTR_ERR(rt); |
| 178 | if (err == -ENETUNREACH) |
Pavel Emelyanov | 7c73a6f | 2008-07-16 20:20:11 -0700 | [diff] [blame] | 179 | IP_INC_STATS_BH(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 180 | return err; |
Wei Dong | 584bdf8 | 2007-05-31 22:49:28 -0700 | [diff] [blame] | 181 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
| 183 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { |
| 184 | ip_rt_put(rt); |
| 185 | return -ENETUNREACH; |
| 186 | } |
| 187 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 188 | if (!inet_opt || !inet_opt->opt.srr) |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 189 | daddr = fl4->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 191 | if (!inet->inet_saddr) |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 192 | inet->inet_saddr = fl4->saddr; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 193 | inet->inet_rcv_saddr = inet->inet_saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 195 | if (tp->rx_opt.ts_recent_stamp && inet->inet_daddr != daddr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | /* Reset inherited state */ |
| 197 | tp->rx_opt.ts_recent = 0; |
| 198 | tp->rx_opt.ts_recent_stamp = 0; |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 199 | if (likely(!tp->repair)) |
| 200 | tp->write_seq = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | } |
| 202 | |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 203 | if (tcp_death_row.sysctl_tw_recycle && |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 204 | !tp->rx_opt.ts_recent_stamp && fl4->daddr == daddr) |
| 205 | tcp_fetch_timewait_stamp(sk, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 207 | inet->inet_dport = usin->sin_port; |
| 208 | inet->inet_daddr = daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 210 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 211 | if (inet_opt) |
| 212 | inet_csk(sk)->icsk_ext_hdr_len = inet_opt->opt.optlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | |
William Allen Simpson | bee7ca9 | 2009-11-10 09:51:18 +0000 | [diff] [blame] | 214 | tp->rx_opt.mss_clamp = TCP_MSS_DEFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | |
| 216 | /* Socket identity is still unknown (sport may be zero). |
| 217 | * However we set state to SYN-SENT and not releasing socket |
| 218 | * lock select source port, enter ourselves into the hash tables and |
| 219 | * complete initialization after this. |
| 220 | */ |
| 221 | tcp_set_state(sk, TCP_SYN_SENT); |
Arnaldo Carvalho de Melo | a7f5e7f | 2005-12-13 23:25:31 -0800 | [diff] [blame] | 222 | err = inet_hash_connect(&tcp_death_row, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | if (err) |
| 224 | goto failure; |
| 225 | |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 226 | rt = ip_route_newports(fl4, rt, orig_sport, orig_dport, |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 227 | inet->inet_sport, inet->inet_dport, sk); |
| 228 | if (IS_ERR(rt)) { |
| 229 | err = PTR_ERR(rt); |
| 230 | rt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | goto failure; |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 232 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | /* OK, now commit destination to socket. */ |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 234 | sk->sk_gso_type = SKB_GSO_TCPV4; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 235 | sk_setup_caps(sk, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 237 | if (!tp->write_seq && likely(!tp->repair)) |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 238 | tp->write_seq = secure_tcp_sequence_number(inet->inet_saddr, |
| 239 | inet->inet_daddr, |
| 240 | inet->inet_sport, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | usin->sin_port); |
| 242 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 243 | inet->inet_id = tp->write_seq ^ jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
Andrey Vagin | 2b91647 | 2012-11-22 01:13:58 +0000 | [diff] [blame] | 245 | err = tcp_connect(sk); |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | rt = NULL; |
| 248 | if (err) |
| 249 | goto failure; |
| 250 | |
| 251 | return 0; |
| 252 | |
| 253 | failure: |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 254 | /* |
| 255 | * This unhashes the socket and releases the local port, |
| 256 | * if necessary. |
| 257 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | tcp_set_state(sk, TCP_CLOSE); |
| 259 | ip_rt_put(rt); |
| 260 | sk->sk_route_caps = 0; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 261 | inet->inet_dport = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | return err; |
| 263 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 264 | EXPORT_SYMBOL(tcp_v4_connect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | /* |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 267 | * This routine reacts to ICMP_FRAG_NEEDED mtu indications as defined in RFC1191. |
| 268 | * It can be called through tcp_release_cb() if socket was owned by user |
| 269 | * at the time tcp_v4_err() was called to handle ICMP message. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | */ |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 271 | static void tcp_v4_mtu_reduced(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | { |
| 273 | struct dst_entry *dst; |
| 274 | struct inet_sock *inet = inet_sk(sk); |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 275 | u32 mtu = tcp_sk(sk)->mtu_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | |
| 277 | /* We are not interested in TCP_LISTEN and open_requests (SYN-ACKs |
| 278 | * send out by Linux are always <576bytes so they should go through |
| 279 | * unfragmented). |
| 280 | */ |
| 281 | if (sk->sk_state == TCP_LISTEN) |
| 282 | return; |
| 283 | |
David S. Miller | 80d0a69 | 2012-07-16 03:28:06 -0700 | [diff] [blame] | 284 | dst = inet_csk_update_pmtu(sk, mtu); |
| 285 | if (!dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | return; |
| 287 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | /* Something is about to be wrong... Remember soft error |
| 289 | * for the case, if this connection will not able to recover. |
| 290 | */ |
| 291 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) |
| 292 | sk->sk_err_soft = EMSGSIZE; |
| 293 | |
| 294 | mtu = dst_mtu(dst); |
| 295 | |
| 296 | if (inet->pmtudisc != IP_PMTUDISC_DONT && |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 297 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | tcp_sync_mss(sk, mtu); |
| 299 | |
| 300 | /* Resend the TCP packet because it's |
| 301 | * clear that the old packet has been |
| 302 | * dropped. This is the new "fast" path mtu |
| 303 | * discovery. |
| 304 | */ |
| 305 | tcp_simple_retransmit(sk); |
| 306 | } /* else let the usual retransmit timer handle it */ |
| 307 | } |
| 308 | |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 309 | static void do_redirect(struct sk_buff *skb, struct sock *sk) |
| 310 | { |
| 311 | struct dst_entry *dst = __sk_dst_check(sk, 0); |
| 312 | |
David S. Miller | 1ed5c48 | 2012-07-12 00:41:25 -0700 | [diff] [blame] | 313 | if (dst) |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 314 | dst->ops->redirect(dst, sk, skb); |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 315 | } |
| 316 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | /* |
| 318 | * This routine is called by the ICMP module when it gets some |
| 319 | * sort of error condition. If err < 0 then the socket should |
| 320 | * be closed and the error returned to the user. If err > 0 |
| 321 | * it's just the icmp type << 8 | icmp code. After adjustment |
| 322 | * header points to the first 8 bytes of the tcp header. We need |
| 323 | * to find the appropriate port. |
| 324 | * |
| 325 | * The locking strategy used here is very "optimistic". When |
| 326 | * someone else accesses the socket the ICMP is just dropped |
| 327 | * and for some paths there is no check at all. |
| 328 | * A more general error queue to queue errors for later handling |
| 329 | * is probably better. |
| 330 | * |
| 331 | */ |
| 332 | |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 333 | void tcp_v4_err(struct sk_buff *icmp_skb, u32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 335 | const struct iphdr *iph = (const struct iphdr *)icmp_skb->data; |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 336 | struct tcphdr *th = (struct tcphdr *)(icmp_skb->data + (iph->ihl << 2)); |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 337 | struct inet_connection_sock *icsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | struct tcp_sock *tp; |
| 339 | struct inet_sock *inet; |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 340 | const int type = icmp_hdr(icmp_skb)->type; |
| 341 | const int code = icmp_hdr(icmp_skb)->code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | struct sock *sk; |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 343 | struct sk_buff *skb; |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 344 | struct request_sock *req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | __u32 seq; |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 346 | __u32 remaining; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | int err; |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 348 | struct net *net = dev_net(icmp_skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 350 | if (icmp_skb->len < (iph->ihl << 2) + 8) { |
Pavel Emelyanov | dcfc23c | 2008-07-14 23:03:00 -0700 | [diff] [blame] | 351 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | return; |
| 353 | } |
| 354 | |
Pavel Emelyanov | fd54d71 | 2008-07-14 23:01:40 -0700 | [diff] [blame] | 355 | sk = inet_lookup(net, &tcp_hashinfo, iph->daddr, th->dest, |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 356 | iph->saddr, th->source, inet_iif(icmp_skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | if (!sk) { |
Pavel Emelyanov | dcfc23c | 2008-07-14 23:03:00 -0700 | [diff] [blame] | 358 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | return; |
| 360 | } |
| 361 | if (sk->sk_state == TCP_TIME_WAIT) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 362 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | return; |
| 364 | } |
| 365 | |
| 366 | bh_lock_sock(sk); |
| 367 | /* If too many ICMPs get dropped on busy |
| 368 | * servers this needs to be solved differently. |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 369 | * We do take care of PMTU discovery (RFC1191) special case : |
| 370 | * we can receive locally generated ICMP messages while socket is held. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | */ |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 372 | if (sock_owned_by_user(sk) && |
| 373 | type != ICMP_DEST_UNREACH && |
| 374 | code != ICMP_FRAG_NEEDED) |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 375 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
| 377 | if (sk->sk_state == TCP_CLOSE) |
| 378 | goto out; |
| 379 | |
stephen hemminger | 97e3ecd1 | 2010-03-18 11:27:32 +0000 | [diff] [blame] | 380 | if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { |
| 381 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); |
| 382 | goto out; |
| 383 | } |
| 384 | |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 385 | icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | tp = tcp_sk(sk); |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 387 | req = tp->fastopen_rsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | seq = ntohl(th->seq); |
| 389 | if (sk->sk_state != TCP_LISTEN && |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 390 | !between(seq, tp->snd_una, tp->snd_nxt) && |
| 391 | (req == NULL || seq != tcp_rsk(req)->snt_isn)) { |
| 392 | /* For a Fast Open socket, allow seq to be snt_isn. */ |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 393 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | goto out; |
| 395 | } |
| 396 | |
| 397 | switch (type) { |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 398 | case ICMP_REDIRECT: |
| 399 | do_redirect(icmp_skb, sk); |
| 400 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | case ICMP_SOURCE_QUENCH: |
| 402 | /* Just silently ignore these. */ |
| 403 | goto out; |
| 404 | case ICMP_PARAMETERPROB: |
| 405 | err = EPROTO; |
| 406 | break; |
| 407 | case ICMP_DEST_UNREACH: |
| 408 | if (code > NR_ICMP_UNREACH) |
| 409 | goto out; |
| 410 | |
| 411 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 412 | tp->mtu_info = info; |
Eric Dumazet | 144d56e | 2012-08-20 00:22:46 +0000 | [diff] [blame] | 413 | if (!sock_owned_by_user(sk)) { |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 414 | tcp_v4_mtu_reduced(sk); |
Eric Dumazet | 144d56e | 2012-08-20 00:22:46 +0000 | [diff] [blame] | 415 | } else { |
| 416 | if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, &tp->tsq_flags)) |
| 417 | sock_hold(sk); |
| 418 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | goto out; |
| 420 | } |
| 421 | |
| 422 | err = icmp_err_convert[code].errno; |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 423 | /* check if icmp_skb allows revert of backoff |
| 424 | * (see draft-zimmermann-tcp-lcd) */ |
| 425 | if (code != ICMP_NET_UNREACH && code != ICMP_HOST_UNREACH) |
| 426 | break; |
| 427 | if (seq != tp->snd_una || !icsk->icsk_retransmits || |
| 428 | !icsk->icsk_backoff) |
| 429 | break; |
| 430 | |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 431 | /* XXX (TFO) - revisit the following logic for TFO */ |
| 432 | |
David S. Miller | 8f49c27 | 2010-11-12 13:35:00 -0800 | [diff] [blame] | 433 | if (sock_owned_by_user(sk)) |
| 434 | break; |
| 435 | |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 436 | icsk->icsk_backoff--; |
Jerry Chu | 9ad7c04 | 2011-06-08 11:08:38 +0000 | [diff] [blame] | 437 | inet_csk(sk)->icsk_rto = (tp->srtt ? __tcp_set_rto(tp) : |
| 438 | TCP_TIMEOUT_INIT) << icsk->icsk_backoff; |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 439 | tcp_bound_rto(sk); |
| 440 | |
| 441 | skb = tcp_write_queue_head(sk); |
| 442 | BUG_ON(!skb); |
| 443 | |
| 444 | remaining = icsk->icsk_rto - min(icsk->icsk_rto, |
| 445 | tcp_time_stamp - TCP_SKB_CB(skb)->when); |
| 446 | |
| 447 | if (remaining) { |
| 448 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, |
| 449 | remaining, TCP_RTO_MAX); |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 450 | } else { |
| 451 | /* RTO revert clocked out retransmission. |
| 452 | * Will retransmit now */ |
| 453 | tcp_retransmit_timer(sk); |
| 454 | } |
| 455 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | break; |
| 457 | case ICMP_TIME_EXCEEDED: |
| 458 | err = EHOSTUNREACH; |
| 459 | break; |
| 460 | default: |
| 461 | goto out; |
| 462 | } |
| 463 | |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 464 | /* XXX (TFO) - if it's a TFO socket and has been accepted, rather |
| 465 | * than following the TCP_SYN_RECV case and closing the socket, |
| 466 | * we ignore the ICMP error and keep trying like a fully established |
| 467 | * socket. Is this the right thing to do? |
| 468 | */ |
| 469 | if (req && req->sk == NULL) |
| 470 | goto out; |
| 471 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | switch (sk->sk_state) { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 473 | struct request_sock *req, **prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | case TCP_LISTEN: |
| 475 | if (sock_owned_by_user(sk)) |
| 476 | goto out; |
| 477 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 478 | req = inet_csk_search_req(sk, &prev, th->dest, |
| 479 | iph->daddr, iph->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | if (!req) |
| 481 | goto out; |
| 482 | |
| 483 | /* ICMPs are not backlogged, hence we cannot get |
| 484 | an established socket here. |
| 485 | */ |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 486 | WARN_ON(req->sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 488 | if (seq != tcp_rsk(req)->snt_isn) { |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 489 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | goto out; |
| 491 | } |
| 492 | |
| 493 | /* |
| 494 | * Still in SYN_RECV, just remove it silently. |
| 495 | * There is no good way to pass the error to the newly |
| 496 | * created socket, and POSIX does not want network |
| 497 | * errors returned from accept(). |
| 498 | */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 499 | inet_csk_reqsk_queue_drop(sk, req, prev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | goto out; |
| 501 | |
| 502 | case TCP_SYN_SENT: |
| 503 | case TCP_SYN_RECV: /* Cannot happen. |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 504 | It can f.e. if SYNs crossed, |
| 505 | or Fast Open. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | */ |
| 507 | if (!sock_owned_by_user(sk)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | sk->sk_err = err; |
| 509 | |
| 510 | sk->sk_error_report(sk); |
| 511 | |
| 512 | tcp_done(sk); |
| 513 | } else { |
| 514 | sk->sk_err_soft = err; |
| 515 | } |
| 516 | goto out; |
| 517 | } |
| 518 | |
| 519 | /* If we've already connected we will keep trying |
| 520 | * until we time out, or the user gives up. |
| 521 | * |
| 522 | * rfc1122 4.2.3.9 allows to consider as hard errors |
| 523 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, |
| 524 | * but it is obsoleted by pmtu discovery). |
| 525 | * |
| 526 | * Note, that in modern internet, where routing is unreliable |
| 527 | * and in each dark corner broken firewalls sit, sending random |
| 528 | * errors ordered by their masters even this two messages finally lose |
| 529 | * their original sense (even Linux sends invalid PORT_UNREACHs) |
| 530 | * |
| 531 | * Now we are in compliance with RFCs. |
| 532 | * --ANK (980905) |
| 533 | */ |
| 534 | |
| 535 | inet = inet_sk(sk); |
| 536 | if (!sock_owned_by_user(sk) && inet->recverr) { |
| 537 | sk->sk_err = err; |
| 538 | sk->sk_error_report(sk); |
| 539 | } else { /* Only an error on timeout */ |
| 540 | sk->sk_err_soft = err; |
| 541 | } |
| 542 | |
| 543 | out: |
| 544 | bh_unlock_sock(sk); |
| 545 | sock_put(sk); |
| 546 | } |
| 547 | |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 548 | static void __tcp_v4_send_check(struct sk_buff *skb, |
| 549 | __be32 saddr, __be32 daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 551 | struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 553 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 554 | th->check = ~tcp_v4_check(skb->len, saddr, daddr, 0); |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 555 | skb->csum_start = skb_transport_header(skb) - skb->head; |
Al Viro | ff1dcad | 2006-11-20 18:07:29 -0800 | [diff] [blame] | 556 | skb->csum_offset = offsetof(struct tcphdr, check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | } else { |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 558 | th->check = tcp_v4_check(skb->len, saddr, daddr, |
Joe Perches | 07f0757 | 2008-11-19 15:44:53 -0800 | [diff] [blame] | 559 | csum_partial(th, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | th->doff << 2, |
| 561 | skb->csum)); |
| 562 | } |
| 563 | } |
| 564 | |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 565 | /* This routine computes an IPv4 TCP checksum. */ |
Herbert Xu | bb29624 | 2010-04-11 02:15:55 +0000 | [diff] [blame] | 566 | void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb) |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 567 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 568 | const struct inet_sock *inet = inet_sk(sk); |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 569 | |
| 570 | __tcp_v4_send_check(skb, inet->inet_saddr, inet->inet_daddr); |
| 571 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 572 | EXPORT_SYMBOL(tcp_v4_send_check); |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 573 | |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 574 | int tcp_v4_gso_send_check(struct sk_buff *skb) |
| 575 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 576 | const struct iphdr *iph; |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 577 | struct tcphdr *th; |
| 578 | |
| 579 | if (!pskb_may_pull(skb, sizeof(*th))) |
| 580 | return -EINVAL; |
| 581 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 582 | iph = ip_hdr(skb); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 583 | th = tcp_hdr(skb); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 584 | |
| 585 | th->check = 0; |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 586 | skb->ip_summed = CHECKSUM_PARTIAL; |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 587 | __tcp_v4_send_check(skb, iph->saddr, iph->daddr); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 588 | return 0; |
| 589 | } |
| 590 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | /* |
| 592 | * This routine will send an RST to the other tcp. |
| 593 | * |
| 594 | * Someone asks: why I NEVER use socket parameters (TOS, TTL etc.) |
| 595 | * for reset. |
| 596 | * Answer: if a packet caused RST, it is not for a socket |
| 597 | * existing in our system, if it is matched to a socket, |
| 598 | * it is just duplicate segment or bug in other side's TCP. |
| 599 | * So that we build reply only basing on parameters |
| 600 | * arrived with segment. |
| 601 | * Exception: precedence violation. We do not implement it in any case. |
| 602 | */ |
| 603 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 604 | static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 606 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 607 | struct { |
| 608 | struct tcphdr th; |
| 609 | #ifdef CONFIG_TCP_MD5SIG |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 610 | __be32 opt[(TCPOLEN_MD5SIG_ALIGNED >> 2)]; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 611 | #endif |
| 612 | } rep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | struct ip_reply_arg arg; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 614 | #ifdef CONFIG_TCP_MD5SIG |
| 615 | struct tcp_md5sig_key *key; |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 616 | const __u8 *hash_location = NULL; |
| 617 | unsigned char newhash[16]; |
| 618 | int genhash; |
| 619 | struct sock *sk1 = NULL; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 620 | #endif |
Pavel Emelyanov | a86b1e3 | 2008-07-16 20:20:58 -0700 | [diff] [blame] | 621 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | |
| 623 | /* Never send a reset in response to a reset. */ |
| 624 | if (th->rst) |
| 625 | return; |
| 626 | |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 627 | if (skb_rtable(skb)->rt_type != RTN_LOCAL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | return; |
| 629 | |
| 630 | /* Swap the send and the receive. */ |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 631 | memset(&rep, 0, sizeof(rep)); |
| 632 | rep.th.dest = th->source; |
| 633 | rep.th.source = th->dest; |
| 634 | rep.th.doff = sizeof(struct tcphdr) / 4; |
| 635 | rep.th.rst = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | |
| 637 | if (th->ack) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 638 | rep.th.seq = th->ack_seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 640 | rep.th.ack = 1; |
| 641 | rep.th.ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin + |
| 642 | skb->len - (th->doff << 2)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | } |
| 644 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 645 | memset(&arg, 0, sizeof(arg)); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 646 | arg.iov[0].iov_base = (unsigned char *)&rep; |
| 647 | arg.iov[0].iov_len = sizeof(rep.th); |
| 648 | |
| 649 | #ifdef CONFIG_TCP_MD5SIG |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 650 | hash_location = tcp_parse_md5sig_option(th); |
| 651 | if (!sk && hash_location) { |
| 652 | /* |
| 653 | * active side is lost. Try to find listening socket through |
| 654 | * source port, and then find md5 key through listening socket. |
| 655 | * we are not loose security here: |
| 656 | * Incoming packet is checked with md5 hash with finding key, |
| 657 | * no RST generated if md5 hash doesn't match. |
| 658 | */ |
| 659 | sk1 = __inet_lookup_listener(dev_net(skb_dst(skb)->dev), |
| 660 | &tcp_hashinfo, ip_hdr(skb)->daddr, |
| 661 | ntohs(th->source), inet_iif(skb)); |
| 662 | /* don't send rst if it can't find key */ |
| 663 | if (!sk1) |
| 664 | return; |
| 665 | rcu_read_lock(); |
| 666 | key = tcp_md5_do_lookup(sk1, (union tcp_md5_addr *) |
| 667 | &ip_hdr(skb)->saddr, AF_INET); |
| 668 | if (!key) |
| 669 | goto release_sk1; |
| 670 | |
| 671 | genhash = tcp_v4_md5_hash_skb(newhash, key, NULL, NULL, skb); |
| 672 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
| 673 | goto release_sk1; |
| 674 | } else { |
| 675 | key = sk ? tcp_md5_do_lookup(sk, (union tcp_md5_addr *) |
| 676 | &ip_hdr(skb)->saddr, |
| 677 | AF_INET) : NULL; |
| 678 | } |
| 679 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 680 | if (key) { |
| 681 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | |
| 682 | (TCPOPT_NOP << 16) | |
| 683 | (TCPOPT_MD5SIG << 8) | |
| 684 | TCPOLEN_MD5SIG); |
| 685 | /* Update length and the length the header thinks exists */ |
| 686 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; |
| 687 | rep.th.doff = arg.iov[0].iov_len / 4; |
| 688 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 689 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[1], |
Ilpo Järvinen | 78e645cb | 2008-10-09 14:37:47 -0700 | [diff] [blame] | 690 | key, ip_hdr(skb)->saddr, |
| 691 | ip_hdr(skb)->daddr, &rep.th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 692 | } |
| 693 | #endif |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 694 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
| 695 | ip_hdr(skb)->saddr, /* XXX */ |
Ilpo Järvinen | 52cd575 | 2008-10-08 11:34:06 -0700 | [diff] [blame] | 696 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 698 | arg.flags = (sk && inet_sk(sk)->transparent) ? IP_REPLY_ARG_NOSRCCHECK : 0; |
Shawn Lu | e2446ea | 2012-02-04 12:38:09 +0000 | [diff] [blame] | 699 | /* When socket is gone, all binding information is lost. |
Alexey Kuznetsov | 4c67525 | 2012-10-12 04:34:17 +0000 | [diff] [blame] | 700 | * routing might fail in this case. No choice here, if we choose to force |
| 701 | * input interface, we will misroute in case of asymmetric route. |
Shawn Lu | e2446ea | 2012-02-04 12:38:09 +0000 | [diff] [blame] | 702 | */ |
Alexey Kuznetsov | 4c67525 | 2012-10-12 04:34:17 +0000 | [diff] [blame] | 703 | if (sk) |
| 704 | arg.bound_dev_if = sk->sk_bound_dev_if; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 706 | net = dev_net(skb_dst(skb)->dev); |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 707 | arg.tos = ip_hdr(skb)->tos; |
Eric Dumazet | be9f4a4 | 2012-07-19 07:34:03 +0000 | [diff] [blame] | 708 | ip_send_unicast_reply(net, skb, ip_hdr(skb)->saddr, |
David S. Miller | 70e7341 | 2012-06-28 03:21:41 -0700 | [diff] [blame] | 709 | ip_hdr(skb)->daddr, &arg, arg.iov[0].iov_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 711 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
| 712 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 713 | |
| 714 | #ifdef CONFIG_TCP_MD5SIG |
| 715 | release_sk1: |
| 716 | if (sk1) { |
| 717 | rcu_read_unlock(); |
| 718 | sock_put(sk1); |
| 719 | } |
| 720 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | } |
| 722 | |
| 723 | /* The code following below sending ACKs in SYN-RECV and TIME-WAIT states |
| 724 | outside socket context is ugly, certainly. What can I do? |
| 725 | */ |
| 726 | |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 727 | static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack, |
| 728 | u32 win, u32 ts, int oif, |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 729 | struct tcp_md5sig_key *key, |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 730 | int reply_flags, u8 tos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 732 | const struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | struct { |
| 734 | struct tcphdr th; |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 735 | __be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 736 | #ifdef CONFIG_TCP_MD5SIG |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 737 | + (TCPOLEN_MD5SIG_ALIGNED >> 2) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 738 | #endif |
| 739 | ]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | } rep; |
| 741 | struct ip_reply_arg arg; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 742 | struct net *net = dev_net(skb_dst(skb)->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | |
| 744 | memset(&rep.th, 0, sizeof(struct tcphdr)); |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 745 | memset(&arg, 0, sizeof(arg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | |
| 747 | arg.iov[0].iov_base = (unsigned char *)&rep; |
| 748 | arg.iov[0].iov_len = sizeof(rep.th); |
| 749 | if (ts) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 750 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| 751 | (TCPOPT_TIMESTAMP << 8) | |
| 752 | TCPOLEN_TIMESTAMP); |
| 753 | rep.opt[1] = htonl(tcp_time_stamp); |
| 754 | rep.opt[2] = htonl(ts); |
Craig Schlenter | cb48cfe | 2007-01-09 00:11:15 -0800 | [diff] [blame] | 755 | arg.iov[0].iov_len += TCPOLEN_TSTAMP_ALIGNED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | } |
| 757 | |
| 758 | /* Swap the send and the receive. */ |
| 759 | rep.th.dest = th->source; |
| 760 | rep.th.source = th->dest; |
| 761 | rep.th.doff = arg.iov[0].iov_len / 4; |
| 762 | rep.th.seq = htonl(seq); |
| 763 | rep.th.ack_seq = htonl(ack); |
| 764 | rep.th.ack = 1; |
| 765 | rep.th.window = htons(win); |
| 766 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 767 | #ifdef CONFIG_TCP_MD5SIG |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 768 | if (key) { |
| 769 | int offset = (ts) ? 3 : 0; |
| 770 | |
| 771 | rep.opt[offset++] = htonl((TCPOPT_NOP << 24) | |
| 772 | (TCPOPT_NOP << 16) | |
| 773 | (TCPOPT_MD5SIG << 8) | |
| 774 | TCPOLEN_MD5SIG); |
| 775 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; |
| 776 | rep.th.doff = arg.iov[0].iov_len/4; |
| 777 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 778 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[offset], |
Adam Langley | 90b7e11 | 2008-07-31 20:49:48 -0700 | [diff] [blame] | 779 | key, ip_hdr(skb)->saddr, |
| 780 | ip_hdr(skb)->daddr, &rep.th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 781 | } |
| 782 | #endif |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 783 | arg.flags = reply_flags; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 784 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
| 785 | ip_hdr(skb)->saddr, /* XXX */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
| 787 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 788 | if (oif) |
| 789 | arg.bound_dev_if = oif; |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 790 | arg.tos = tos; |
Eric Dumazet | be9f4a4 | 2012-07-19 07:34:03 +0000 | [diff] [blame] | 791 | ip_send_unicast_reply(net, skb, ip_hdr(skb)->saddr, |
David S. Miller | 70e7341 | 2012-06-28 03:21:41 -0700 | [diff] [blame] | 792 | ip_hdr(skb)->daddr, &arg, arg.iov[0].iov_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 794 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | } |
| 796 | |
| 797 | static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) |
| 798 | { |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 799 | struct inet_timewait_sock *tw = inet_twsk(sk); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 800 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 802 | tcp_v4_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 803 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 804 | tcptw->tw_ts_recent, |
| 805 | tw->tw_bound_dev_if, |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 806 | tcp_twsk_md5_key(tcptw), |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 807 | tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0, |
| 808 | tw->tw_tos |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 809 | ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 811 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | } |
| 813 | |
Gui Jianfeng | 6edafaa | 2008-08-06 23:50:04 -0700 | [diff] [blame] | 814 | static void tcp_v4_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 815 | struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | { |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 817 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
| 818 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. |
| 819 | */ |
| 820 | tcp_v4_send_ack(skb, (sk->sk_state == TCP_LISTEN) ? |
| 821 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
| 822 | tcp_rsk(req)->rcv_nxt, req->rcv_wnd, |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 823 | req->ts_recent, |
| 824 | 0, |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 825 | tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&ip_hdr(skb)->daddr, |
| 826 | AF_INET), |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 827 | inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0, |
| 828 | ip_hdr(skb)->tos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | } |
| 830 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | /* |
Kris Katterjohn | 9bf1d83 | 2008-02-17 22:29:19 -0800 | [diff] [blame] | 832 | * Send a SYN-ACK after having received a SYN. |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 833 | * This still operates on a request_sock only, not on a big |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | * socket. |
| 835 | */ |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 836 | static int tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst, |
| 837 | struct request_sock *req, |
Eric Dumazet | fff3269 | 2012-06-01 01:47:50 +0000 | [diff] [blame] | 838 | struct request_values *rvp, |
Eric Dumazet | 7586ece | 2012-06-20 05:02:19 +0000 | [diff] [blame] | 839 | u16 queue_mapping, |
| 840 | bool nocache) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 842 | const struct inet_request_sock *ireq = inet_rsk(req); |
David S. Miller | 6bd023f | 2011-05-18 18:32:03 -0400 | [diff] [blame] | 843 | struct flowi4 fl4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | int err = -1; |
| 845 | struct sk_buff * skb; |
| 846 | |
| 847 | /* First, grab a route. */ |
David S. Miller | ba3f7f0 | 2012-07-17 14:02:46 -0700 | [diff] [blame] | 848 | if (!dst && (dst = inet_csk_route_req(sk, &fl4, req)) == NULL) |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 849 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 851 | skb = tcp_make_synack(sk, dst, req, rvp, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | |
| 853 | if (skb) { |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 854 | __tcp_v4_send_check(skb, ireq->loc_addr, ireq->rmt_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | |
Eric Dumazet | fff3269 | 2012-06-01 01:47:50 +0000 | [diff] [blame] | 856 | skb_set_queue_mapping(skb, queue_mapping); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 857 | err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, |
| 858 | ireq->rmt_addr, |
| 859 | ireq->opt); |
Gerrit Renker | b9df3cb | 2006-11-14 11:21:36 -0200 | [diff] [blame] | 860 | err = net_xmit_eval(err); |
Neal Cardwell | 016818d | 2012-09-22 04:18:55 +0000 | [diff] [blame] | 861 | if (!tcp_rsk(req)->snt_synack && !err) |
| 862 | tcp_rsk(req)->snt_synack = tcp_time_stamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | } |
| 864 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | return err; |
| 866 | } |
| 867 | |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 868 | static int tcp_v4_rtx_synack(struct sock *sk, struct request_sock *req, |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 869 | struct request_values *rvp) |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 870 | { |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 871 | int res = tcp_v4_send_synack(sk, NULL, req, rvp, 0, false); |
| 872 | |
| 873 | if (!res) |
| 874 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); |
| 875 | return res; |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 876 | } |
| 877 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | /* |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 879 | * IPv4 request_sock destructor. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | */ |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 881 | static void tcp_v4_reqsk_destructor(struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | { |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 883 | kfree(inet_rsk(req)->opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | } |
| 885 | |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 886 | /* |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 887 | * Return true if a syncookie should be sent |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 888 | */ |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 889 | bool tcp_syn_flood_action(struct sock *sk, |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 890 | const struct sk_buff *skb, |
| 891 | const char *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | { |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 893 | const char *msg = "Dropping request"; |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 894 | bool want_cookie = false; |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 895 | struct listen_sock *lopt; |
| 896 | |
| 897 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | |
Florian Westphal | 2a1d4bd | 2010-06-03 00:43:12 +0000 | [diff] [blame] | 899 | #ifdef CONFIG_SYN_COOKIES |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 900 | if (sysctl_tcp_syncookies) { |
Florian Westphal | 2a1d4bd | 2010-06-03 00:43:12 +0000 | [diff] [blame] | 901 | msg = "Sending cookies"; |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 902 | want_cookie = true; |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 903 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPREQQFULLDOCOOKIES); |
| 904 | } else |
Arnaldo Carvalho de Melo | 80e40da | 2006-01-04 01:58:06 -0200 | [diff] [blame] | 905 | #endif |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 906 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPREQQFULLDROP); |
Florian Westphal | 2a1d4bd | 2010-06-03 00:43:12 +0000 | [diff] [blame] | 907 | |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 908 | lopt = inet_csk(sk)->icsk_accept_queue.listen_opt; |
| 909 | if (!lopt->synflood_warned) { |
| 910 | lopt->synflood_warned = 1; |
Joe Perches | afd46503 | 2012-03-12 07:03:32 +0000 | [diff] [blame] | 911 | pr_info("%s: Possible SYN flooding on port %d. %s. Check SNMP counters.\n", |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 912 | proto, ntohs(tcp_hdr(skb)->dest), msg); |
| 913 | } |
| 914 | return want_cookie; |
Florian Westphal | 2a1d4bd | 2010-06-03 00:43:12 +0000 | [diff] [blame] | 915 | } |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 916 | EXPORT_SYMBOL(tcp_syn_flood_action); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | |
| 918 | /* |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 919 | * Save and compile IPv4 options into the request_sock if needed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | */ |
Christoph Paasch | 5dff747 | 2012-09-26 11:59:09 +0000 | [diff] [blame] | 921 | static struct ip_options_rcu *tcp_v4_save_options(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | { |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 923 | const struct ip_options *opt = &(IPCB(skb)->opt); |
| 924 | struct ip_options_rcu *dopt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | |
| 926 | if (opt && opt->optlen) { |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 927 | int opt_size = sizeof(*dopt) + opt->optlen; |
| 928 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | dopt = kmalloc(opt_size, GFP_ATOMIC); |
| 930 | if (dopt) { |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 931 | if (ip_options_echo(&dopt->opt, skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | kfree(dopt); |
| 933 | dopt = NULL; |
| 934 | } |
| 935 | } |
| 936 | } |
| 937 | return dopt; |
| 938 | } |
| 939 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 940 | #ifdef CONFIG_TCP_MD5SIG |
| 941 | /* |
| 942 | * RFC2385 MD5 checksumming requires a mapping of |
| 943 | * IP address->MD5 Key. |
| 944 | * We need to maintain these in the sk structure. |
| 945 | */ |
| 946 | |
| 947 | /* Find the Key structure for an address. */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 948 | struct tcp_md5sig_key *tcp_md5_do_lookup(struct sock *sk, |
| 949 | const union tcp_md5_addr *addr, |
| 950 | int family) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 951 | { |
| 952 | struct tcp_sock *tp = tcp_sk(sk); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 953 | struct tcp_md5sig_key *key; |
| 954 | struct hlist_node *pos; |
| 955 | unsigned int size = sizeof(struct in_addr); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 956 | struct tcp_md5sig_info *md5sig; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 957 | |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 958 | /* caller either holds rcu_read_lock() or socket lock */ |
| 959 | md5sig = rcu_dereference_check(tp->md5sig_info, |
Eric Dumazet | b4fb05e | 2012-03-07 04:45:43 +0000 | [diff] [blame] | 960 | sock_owned_by_user(sk) || |
| 961 | lockdep_is_held(&sk->sk_lock.slock)); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 962 | if (!md5sig) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 963 | return NULL; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 964 | #if IS_ENABLED(CONFIG_IPV6) |
| 965 | if (family == AF_INET6) |
| 966 | size = sizeof(struct in6_addr); |
| 967 | #endif |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 968 | hlist_for_each_entry_rcu(key, pos, &md5sig->head, node) { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 969 | if (key->family != family) |
| 970 | continue; |
| 971 | if (!memcmp(&key->addr, addr, size)) |
| 972 | return key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 973 | } |
| 974 | return NULL; |
| 975 | } |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 976 | EXPORT_SYMBOL(tcp_md5_do_lookup); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 977 | |
| 978 | struct tcp_md5sig_key *tcp_v4_md5_lookup(struct sock *sk, |
| 979 | struct sock *addr_sk) |
| 980 | { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 981 | union tcp_md5_addr *addr; |
| 982 | |
| 983 | addr = (union tcp_md5_addr *)&inet_sk(addr_sk)->inet_daddr; |
| 984 | return tcp_md5_do_lookup(sk, addr, AF_INET); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 985 | } |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 986 | EXPORT_SYMBOL(tcp_v4_md5_lookup); |
| 987 | |
Adrian Bunk | f5b99bc | 2006-11-30 17:22:29 -0800 | [diff] [blame] | 988 | static struct tcp_md5sig_key *tcp_v4_reqsk_md5_lookup(struct sock *sk, |
| 989 | struct request_sock *req) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 990 | { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 991 | union tcp_md5_addr *addr; |
| 992 | |
| 993 | addr = (union tcp_md5_addr *)&inet_rsk(req)->rmt_addr; |
| 994 | return tcp_md5_do_lookup(sk, addr, AF_INET); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 995 | } |
| 996 | |
| 997 | /* This can be called on a newly created socket, from other files */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 998 | int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr, |
| 999 | int family, const u8 *newkey, u8 newkeylen, gfp_t gfp) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1000 | { |
| 1001 | /* Add Key to the list */ |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 1002 | struct tcp_md5sig_key *key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1003 | struct tcp_sock *tp = tcp_sk(sk); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1004 | struct tcp_md5sig_info *md5sig; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1005 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1006 | key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&addr, AF_INET); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1007 | if (key) { |
| 1008 | /* Pre-existing entry - just update that one. */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1009 | memcpy(key->key, newkey, newkeylen); |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 1010 | key->keylen = newkeylen; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1011 | return 0; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1012 | } |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1013 | |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1014 | md5sig = rcu_dereference_protected(tp->md5sig_info, |
| 1015 | sock_owned_by_user(sk)); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1016 | if (!md5sig) { |
| 1017 | md5sig = kmalloc(sizeof(*md5sig), gfp); |
| 1018 | if (!md5sig) |
| 1019 | return -ENOMEM; |
| 1020 | |
| 1021 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
| 1022 | INIT_HLIST_HEAD(&md5sig->head); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1023 | rcu_assign_pointer(tp->md5sig_info, md5sig); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1024 | } |
| 1025 | |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 1026 | key = sock_kmalloc(sk, sizeof(*key), gfp); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1027 | if (!key) |
| 1028 | return -ENOMEM; |
| 1029 | if (hlist_empty(&md5sig->head) && !tcp_alloc_md5sig_pool(sk)) { |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 1030 | sock_kfree_s(sk, key, sizeof(*key)); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1031 | return -ENOMEM; |
| 1032 | } |
| 1033 | |
| 1034 | memcpy(key->key, newkey, newkeylen); |
| 1035 | key->keylen = newkeylen; |
| 1036 | key->family = family; |
| 1037 | memcpy(&key->addr, addr, |
| 1038 | (family == AF_INET6) ? sizeof(struct in6_addr) : |
| 1039 | sizeof(struct in_addr)); |
| 1040 | hlist_add_head_rcu(&key->node, &md5sig->head); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1041 | return 0; |
| 1042 | } |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1043 | EXPORT_SYMBOL(tcp_md5_do_add); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1044 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1045 | 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] | 1046 | { |
| 1047 | struct tcp_sock *tp = tcp_sk(sk); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1048 | struct tcp_md5sig_key *key; |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1049 | struct tcp_md5sig_info *md5sig; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1050 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1051 | key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&addr, AF_INET); |
| 1052 | if (!key) |
| 1053 | return -ENOENT; |
| 1054 | hlist_del_rcu(&key->node); |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 1055 | atomic_sub(sizeof(*key), &sk->sk_omem_alloc); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1056 | kfree_rcu(key, rcu); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1057 | md5sig = rcu_dereference_protected(tp->md5sig_info, |
| 1058 | sock_owned_by_user(sk)); |
| 1059 | if (hlist_empty(&md5sig->head)) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1060 | tcp_free_md5sig_pool(); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1061 | return 0; |
| 1062 | } |
| 1063 | EXPORT_SYMBOL(tcp_md5_do_del); |
| 1064 | |
stephen hemminger | e0683e70 | 2012-10-26 14:31:40 +0000 | [diff] [blame] | 1065 | static void tcp_clear_md5_list(struct sock *sk) |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1066 | { |
| 1067 | struct tcp_sock *tp = tcp_sk(sk); |
| 1068 | struct tcp_md5sig_key *key; |
| 1069 | struct hlist_node *pos, *n; |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1070 | struct tcp_md5sig_info *md5sig; |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1071 | |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1072 | md5sig = rcu_dereference_protected(tp->md5sig_info, 1); |
| 1073 | |
| 1074 | if (!hlist_empty(&md5sig->head)) |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1075 | tcp_free_md5sig_pool(); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1076 | hlist_for_each_entry_safe(key, pos, n, &md5sig->head, node) { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1077 | hlist_del_rcu(&key->node); |
Eric Dumazet | 5f3d9cb | 2012-01-31 10:56:48 +0000 | [diff] [blame] | 1078 | atomic_sub(sizeof(*key), &sk->sk_omem_alloc); |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1079 | kfree_rcu(key, rcu); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1080 | } |
| 1081 | } |
| 1082 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1083 | static int tcp_v4_parse_md5_keys(struct sock *sk, char __user *optval, |
| 1084 | int optlen) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1085 | { |
| 1086 | struct tcp_md5sig cmd; |
| 1087 | struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1088 | |
| 1089 | if (optlen < sizeof(cmd)) |
| 1090 | return -EINVAL; |
| 1091 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1092 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1093 | return -EFAULT; |
| 1094 | |
| 1095 | if (sin->sin_family != AF_INET) |
| 1096 | return -EINVAL; |
| 1097 | |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 1098 | if (!cmd.tcpm_key || !cmd.tcpm_keylen) |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1099 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr, |
| 1100 | AF_INET); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1101 | |
| 1102 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) |
| 1103 | return -EINVAL; |
| 1104 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1105 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr, |
| 1106 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, |
| 1107 | GFP_KERNEL); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1108 | } |
| 1109 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1110 | static int tcp_v4_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
| 1111 | __be32 daddr, __be32 saddr, int nbytes) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1112 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1113 | struct tcp4_pseudohdr *bp; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1114 | struct scatterlist sg; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1115 | |
| 1116 | bp = &hp->md5_blk.ip4; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1117 | |
| 1118 | /* |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1119 | * 1. the TCP pseudo-header (in the order: source IP address, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1120 | * destination IP address, zero-padded protocol number, and |
| 1121 | * segment length) |
| 1122 | */ |
| 1123 | bp->saddr = saddr; |
| 1124 | bp->daddr = daddr; |
| 1125 | bp->pad = 0; |
YOSHIFUJI Hideaki | 076fb72 | 2008-04-17 12:48:12 +0900 | [diff] [blame] | 1126 | bp->protocol = IPPROTO_TCP; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1127 | bp->len = cpu_to_be16(nbytes); |
David S. Miller | c7da57a | 2007-10-26 00:41:21 -0700 | [diff] [blame] | 1128 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1129 | sg_init_one(&sg, bp, sizeof(*bp)); |
| 1130 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); |
| 1131 | } |
| 1132 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1133 | 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] | 1134 | __be32 daddr, __be32 saddr, const struct tcphdr *th) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1135 | { |
| 1136 | struct tcp_md5sig_pool *hp; |
| 1137 | struct hash_desc *desc; |
| 1138 | |
| 1139 | hp = tcp_get_md5sig_pool(); |
| 1140 | if (!hp) |
| 1141 | goto clear_hash_noput; |
| 1142 | desc = &hp->md5_desc; |
| 1143 | |
| 1144 | if (crypto_hash_init(desc)) |
| 1145 | goto clear_hash; |
| 1146 | if (tcp_v4_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) |
| 1147 | goto clear_hash; |
| 1148 | if (tcp_md5_hash_header(hp, th)) |
| 1149 | goto clear_hash; |
| 1150 | if (tcp_md5_hash_key(hp, key)) |
| 1151 | goto clear_hash; |
| 1152 | if (crypto_hash_final(desc, md5_hash)) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1153 | goto clear_hash; |
| 1154 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1155 | tcp_put_md5sig_pool(); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1156 | return 0; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1157 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1158 | clear_hash: |
| 1159 | tcp_put_md5sig_pool(); |
| 1160 | clear_hash_noput: |
| 1161 | memset(md5_hash, 0, 16); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1162 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1163 | } |
| 1164 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1165 | int tcp_v4_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 1166 | const struct sock *sk, const struct request_sock *req, |
| 1167 | const struct sk_buff *skb) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1168 | { |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1169 | struct tcp_md5sig_pool *hp; |
| 1170 | struct hash_desc *desc; |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 1171 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1172 | __be32 saddr, daddr; |
| 1173 | |
| 1174 | if (sk) { |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1175 | saddr = inet_sk(sk)->inet_saddr; |
| 1176 | daddr = inet_sk(sk)->inet_daddr; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1177 | } else if (req) { |
| 1178 | saddr = inet_rsk(req)->loc_addr; |
| 1179 | daddr = inet_rsk(req)->rmt_addr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1180 | } else { |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1181 | const struct iphdr *iph = ip_hdr(skb); |
| 1182 | saddr = iph->saddr; |
| 1183 | daddr = iph->daddr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1184 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1185 | |
| 1186 | hp = tcp_get_md5sig_pool(); |
| 1187 | if (!hp) |
| 1188 | goto clear_hash_noput; |
| 1189 | desc = &hp->md5_desc; |
| 1190 | |
| 1191 | if (crypto_hash_init(desc)) |
| 1192 | goto clear_hash; |
| 1193 | |
| 1194 | if (tcp_v4_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) |
| 1195 | goto clear_hash; |
| 1196 | if (tcp_md5_hash_header(hp, th)) |
| 1197 | goto clear_hash; |
| 1198 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) |
| 1199 | goto clear_hash; |
| 1200 | if (tcp_md5_hash_key(hp, key)) |
| 1201 | goto clear_hash; |
| 1202 | if (crypto_hash_final(desc, md5_hash)) |
| 1203 | goto clear_hash; |
| 1204 | |
| 1205 | tcp_put_md5sig_pool(); |
| 1206 | return 0; |
| 1207 | |
| 1208 | clear_hash: |
| 1209 | tcp_put_md5sig_pool(); |
| 1210 | clear_hash_noput: |
| 1211 | memset(md5_hash, 0, 16); |
| 1212 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1213 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1214 | EXPORT_SYMBOL(tcp_v4_md5_hash_skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1215 | |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1216 | static bool tcp_v4_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1217 | { |
| 1218 | /* |
| 1219 | * This gets called for each TCP segment that arrives |
| 1220 | * so we want to be efficient. |
| 1221 | * We have 3 drop cases: |
| 1222 | * o No MD5 hash and one expected. |
| 1223 | * o MD5 hash and we're not expecting one. |
| 1224 | * o MD5 hash and its wrong. |
| 1225 | */ |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1226 | const __u8 *hash_location = NULL; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1227 | struct tcp_md5sig_key *hash_expected; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1228 | const struct iphdr *iph = ip_hdr(skb); |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1229 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1230 | int genhash; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1231 | unsigned char newhash[16]; |
| 1232 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1233 | hash_expected = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&iph->saddr, |
| 1234 | AF_INET); |
YOSHIFUJI Hideaki | 7d5d552 | 2008-04-17 12:29:53 +0900 | [diff] [blame] | 1235 | hash_location = tcp_parse_md5sig_option(th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1236 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1237 | /* We've parsed the options - do we have a hash? */ |
| 1238 | if (!hash_expected && !hash_location) |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1239 | return false; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1240 | |
| 1241 | if (hash_expected && !hash_location) { |
David S. Miller | 785957d | 2008-07-30 03:03:15 -0700 | [diff] [blame] | 1242 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1243 | return true; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1244 | } |
| 1245 | |
| 1246 | if (!hash_expected && hash_location) { |
David S. Miller | 785957d | 2008-07-30 03:03:15 -0700 | [diff] [blame] | 1247 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1248 | return true; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1249 | } |
| 1250 | |
| 1251 | /* Okay, so this is hash_expected and hash_location - |
| 1252 | * so we need to calculate the checksum. |
| 1253 | */ |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1254 | genhash = tcp_v4_md5_hash_skb(newhash, |
| 1255 | hash_expected, |
| 1256 | NULL, NULL, skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1257 | |
| 1258 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1259 | net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s\n", |
| 1260 | &iph->saddr, ntohs(th->source), |
| 1261 | &iph->daddr, ntohs(th->dest), |
| 1262 | genhash ? " tcp_v4_calc_md5_hash failed" |
| 1263 | : ""); |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1264 | return true; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1265 | } |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1266 | return false; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1267 | } |
| 1268 | |
| 1269 | #endif |
| 1270 | |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 1271 | struct request_sock_ops tcp_request_sock_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | .family = PF_INET, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1273 | .obj_size = sizeof(struct tcp_request_sock), |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 1274 | .rtx_syn_ack = tcp_v4_rtx_synack, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1275 | .send_ack = tcp_v4_reqsk_send_ack, |
| 1276 | .destructor = tcp_v4_reqsk_destructor, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | .send_reset = tcp_v4_send_reset, |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 1278 | .syn_ack_timeout = tcp_syn_ack_timeout, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | }; |
| 1280 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1281 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 1282 | static const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1283 | .md5_lookup = tcp_v4_reqsk_md5_lookup, |
John Dykstra | e3afe7b | 2009-07-16 05:04:51 +0000 | [diff] [blame] | 1284 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1285 | }; |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 1286 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1287 | |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1288 | static bool tcp_fastopen_check(struct sock *sk, struct sk_buff *skb, |
| 1289 | struct request_sock *req, |
| 1290 | struct tcp_fastopen_cookie *foc, |
| 1291 | struct tcp_fastopen_cookie *valid_foc) |
| 1292 | { |
| 1293 | bool skip_cookie = false; |
| 1294 | struct fastopen_queue *fastopenq; |
| 1295 | |
| 1296 | if (likely(!fastopen_cookie_present(foc))) { |
| 1297 | /* See include/net/tcp.h for the meaning of these knobs */ |
| 1298 | if ((sysctl_tcp_fastopen & TFO_SERVER_ALWAYS) || |
| 1299 | ((sysctl_tcp_fastopen & TFO_SERVER_COOKIE_NOT_REQD) && |
| 1300 | (TCP_SKB_CB(skb)->end_seq != TCP_SKB_CB(skb)->seq + 1))) |
| 1301 | skip_cookie = true; /* no cookie to validate */ |
| 1302 | else |
| 1303 | return false; |
| 1304 | } |
| 1305 | fastopenq = inet_csk(sk)->icsk_accept_queue.fastopenq; |
| 1306 | /* A FO option is present; bump the counter. */ |
| 1307 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPFASTOPENPASSIVE); |
| 1308 | |
| 1309 | /* Make sure the listener has enabled fastopen, and we don't |
| 1310 | * exceed the max # of pending TFO requests allowed before trying |
| 1311 | * to validating the cookie in order to avoid burning CPU cycles |
| 1312 | * unnecessarily. |
| 1313 | * |
| 1314 | * XXX (TFO) - The implication of checking the max_qlen before |
| 1315 | * processing a cookie request is that clients can't differentiate |
| 1316 | * between qlen overflow causing Fast Open to be disabled |
| 1317 | * temporarily vs a server not supporting Fast Open at all. |
| 1318 | */ |
| 1319 | if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) == 0 || |
| 1320 | fastopenq == NULL || fastopenq->max_qlen == 0) |
| 1321 | return false; |
| 1322 | |
| 1323 | if (fastopenq->qlen >= fastopenq->max_qlen) { |
| 1324 | struct request_sock *req1; |
| 1325 | spin_lock(&fastopenq->lock); |
| 1326 | req1 = fastopenq->rskq_rst_head; |
| 1327 | if ((req1 == NULL) || time_after(req1->expires, jiffies)) { |
| 1328 | spin_unlock(&fastopenq->lock); |
| 1329 | NET_INC_STATS_BH(sock_net(sk), |
| 1330 | LINUX_MIB_TCPFASTOPENLISTENOVERFLOW); |
| 1331 | /* Avoid bumping LINUX_MIB_TCPFASTOPENPASSIVEFAIL*/ |
| 1332 | foc->len = -1; |
| 1333 | return false; |
| 1334 | } |
| 1335 | fastopenq->rskq_rst_head = req1->dl_next; |
| 1336 | fastopenq->qlen--; |
| 1337 | spin_unlock(&fastopenq->lock); |
| 1338 | reqsk_free(req1); |
| 1339 | } |
| 1340 | if (skip_cookie) { |
| 1341 | tcp_rsk(req)->rcv_nxt = TCP_SKB_CB(skb)->end_seq; |
| 1342 | return true; |
| 1343 | } |
| 1344 | if (foc->len == TCP_FASTOPEN_COOKIE_SIZE) { |
| 1345 | if ((sysctl_tcp_fastopen & TFO_SERVER_COOKIE_NOT_CHKED) == 0) { |
| 1346 | tcp_fastopen_cookie_gen(ip_hdr(skb)->saddr, valid_foc); |
| 1347 | if ((valid_foc->len != TCP_FASTOPEN_COOKIE_SIZE) || |
| 1348 | memcmp(&foc->val[0], &valid_foc->val[0], |
| 1349 | TCP_FASTOPEN_COOKIE_SIZE) != 0) |
| 1350 | return false; |
| 1351 | valid_foc->len = -1; |
| 1352 | } |
| 1353 | /* Acknowledge the data received from the peer. */ |
| 1354 | tcp_rsk(req)->rcv_nxt = TCP_SKB_CB(skb)->end_seq; |
| 1355 | return true; |
| 1356 | } else if (foc->len == 0) { /* Client requesting a cookie */ |
| 1357 | tcp_fastopen_cookie_gen(ip_hdr(skb)->saddr, valid_foc); |
| 1358 | NET_INC_STATS_BH(sock_net(sk), |
| 1359 | LINUX_MIB_TCPFASTOPENCOOKIEREQD); |
| 1360 | } else { |
| 1361 | /* Client sent a cookie with wrong size. Treat it |
| 1362 | * the same as invalid and return a valid one. |
| 1363 | */ |
| 1364 | tcp_fastopen_cookie_gen(ip_hdr(skb)->saddr, valid_foc); |
| 1365 | } |
| 1366 | return false; |
| 1367 | } |
| 1368 | |
| 1369 | static int tcp_v4_conn_req_fastopen(struct sock *sk, |
| 1370 | struct sk_buff *skb, |
| 1371 | struct sk_buff *skb_synack, |
| 1372 | struct request_sock *req, |
| 1373 | struct request_values *rvp) |
| 1374 | { |
| 1375 | struct tcp_sock *tp = tcp_sk(sk); |
| 1376 | struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue; |
| 1377 | const struct inet_request_sock *ireq = inet_rsk(req); |
| 1378 | struct sock *child; |
Neal Cardwell | 016818d | 2012-09-22 04:18:55 +0000 | [diff] [blame] | 1379 | int err; |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1380 | |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 1381 | req->num_retrans = 0; |
| 1382 | req->num_timeout = 0; |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1383 | req->sk = NULL; |
| 1384 | |
| 1385 | child = inet_csk(sk)->icsk_af_ops->syn_recv_sock(sk, skb, req, NULL); |
| 1386 | if (child == NULL) { |
| 1387 | NET_INC_STATS_BH(sock_net(sk), |
| 1388 | LINUX_MIB_TCPFASTOPENPASSIVEFAIL); |
| 1389 | kfree_skb(skb_synack); |
| 1390 | return -1; |
| 1391 | } |
Neal Cardwell | 016818d | 2012-09-22 04:18:55 +0000 | [diff] [blame] | 1392 | err = ip_build_and_send_pkt(skb_synack, sk, ireq->loc_addr, |
| 1393 | ireq->rmt_addr, ireq->opt); |
| 1394 | err = net_xmit_eval(err); |
| 1395 | if (!err) |
| 1396 | tcp_rsk(req)->snt_synack = tcp_time_stamp; |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1397 | /* XXX (TFO) - is it ok to ignore error and continue? */ |
| 1398 | |
| 1399 | spin_lock(&queue->fastopenq->lock); |
| 1400 | queue->fastopenq->qlen++; |
| 1401 | spin_unlock(&queue->fastopenq->lock); |
| 1402 | |
| 1403 | /* Initialize the child socket. Have to fix some values to take |
| 1404 | * into account the child is a Fast Open socket and is created |
| 1405 | * only out of the bits carried in the SYN packet. |
| 1406 | */ |
| 1407 | tp = tcp_sk(child); |
| 1408 | |
| 1409 | tp->fastopen_rsk = req; |
| 1410 | /* Do a hold on the listner sk so that if the listener is being |
| 1411 | * closed, the child that has been accepted can live on and still |
| 1412 | * access listen_lock. |
| 1413 | */ |
| 1414 | sock_hold(sk); |
| 1415 | tcp_rsk(req)->listener = sk; |
| 1416 | |
| 1417 | /* RFC1323: The window in SYN & SYN/ACK segments is never |
| 1418 | * scaled. So correct it appropriately. |
| 1419 | */ |
| 1420 | tp->snd_wnd = ntohs(tcp_hdr(skb)->window); |
| 1421 | |
| 1422 | /* Activate the retrans timer so that SYNACK can be retransmitted. |
| 1423 | * The request socket is not added to the SYN table of the parent |
| 1424 | * because it's been added to the accept queue directly. |
| 1425 | */ |
| 1426 | inet_csk_reset_xmit_timer(child, ICSK_TIME_RETRANS, |
| 1427 | TCP_TIMEOUT_INIT, TCP_RTO_MAX); |
| 1428 | |
| 1429 | /* Add the child socket directly into the accept queue */ |
| 1430 | inet_csk_reqsk_queue_add(sk, req, child); |
| 1431 | |
| 1432 | /* Now finish processing the fastopen child socket. */ |
| 1433 | inet_csk(child)->icsk_af_ops->rebuild_header(child); |
| 1434 | tcp_init_congestion_control(child); |
| 1435 | tcp_mtup_init(child); |
| 1436 | tcp_init_buffer_space(child); |
| 1437 | tcp_init_metrics(child); |
| 1438 | |
| 1439 | /* Queue the data carried in the SYN packet. We need to first |
| 1440 | * bump skb's refcnt because the caller will attempt to free it. |
| 1441 | * |
| 1442 | * XXX (TFO) - we honor a zero-payload TFO request for now. |
| 1443 | * (Any reason not to?) |
| 1444 | */ |
| 1445 | if (TCP_SKB_CB(skb)->end_seq == TCP_SKB_CB(skb)->seq + 1) { |
| 1446 | /* Don't queue the skb if there is no payload in SYN. |
| 1447 | * XXX (TFO) - How about SYN+FIN? |
| 1448 | */ |
| 1449 | tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq; |
| 1450 | } else { |
| 1451 | skb = skb_get(skb); |
| 1452 | skb_dst_drop(skb); |
| 1453 | __skb_pull(skb, tcp_hdr(skb)->doff * 4); |
| 1454 | skb_set_owner_r(skb, child); |
| 1455 | __skb_queue_tail(&child->sk_receive_queue, skb); |
| 1456 | tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq; |
Yuchung Cheng | 6f73601 | 2012-10-19 15:14:44 +0000 | [diff] [blame] | 1457 | tp->syn_data_acked = 1; |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1458 | } |
| 1459 | sk->sk_data_ready(sk, 0); |
| 1460 | bh_unlock_sock(child); |
| 1461 | sock_put(child); |
| 1462 | WARN_ON(req->sk == NULL); |
| 1463 | return 0; |
| 1464 | } |
| 1465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) |
| 1467 | { |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1468 | struct tcp_extend_values tmp_ext; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | struct tcp_options_received tmp_opt; |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1470 | const u8 *hash_location; |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1471 | struct request_sock *req; |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1472 | struct inet_request_sock *ireq; |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1473 | struct tcp_sock *tp = tcp_sk(sk); |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1474 | struct dst_entry *dst = NULL; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1475 | __be32 saddr = ip_hdr(skb)->saddr; |
| 1476 | __be32 daddr = ip_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1477 | __u32 isn = TCP_SKB_CB(skb)->when; |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1478 | bool want_cookie = false; |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1479 | struct flowi4 fl4; |
| 1480 | struct tcp_fastopen_cookie foc = { .len = -1 }; |
| 1481 | struct tcp_fastopen_cookie valid_foc = { .len = -1 }; |
| 1482 | struct sk_buff *skb_synack; |
| 1483 | int do_fastopen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | |
| 1485 | /* Never answer to SYNs send to broadcast or multicast */ |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 1486 | if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | goto drop; |
| 1488 | |
| 1489 | /* TW buckets are converted to open requests without |
| 1490 | * limitations, they conserve resources and peer is |
| 1491 | * evidently real one. |
| 1492 | */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1493 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 1494 | want_cookie = tcp_syn_flood_action(sk, skb, "TCP"); |
| 1495 | if (!want_cookie) |
| 1496 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | } |
| 1498 | |
| 1499 | /* Accept backlog is full. If we have already queued enough |
| 1500 | * of warm entries in syn queue, drop request. It is better than |
| 1501 | * clogging syn queue with openreqs with exponentially increasing |
| 1502 | * timeout. |
| 1503 | */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1504 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | goto drop; |
| 1506 | |
Arnaldo Carvalho de Melo | ce4a7d0 | 2008-06-10 12:39:35 -0700 | [diff] [blame] | 1507 | req = inet_reqsk_alloc(&tcp_request_sock_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | if (!req) |
| 1509 | goto drop; |
| 1510 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1511 | #ifdef CONFIG_TCP_MD5SIG |
| 1512 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv4_ops; |
| 1513 | #endif |
| 1514 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | tcp_clear_options(&tmp_opt); |
William Allen Simpson | bee7ca9 | 2009-11-10 09:51:18 +0000 | [diff] [blame] | 1516 | tmp_opt.mss_clamp = TCP_MSS_DEFAULT; |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1517 | tmp_opt.user_mss = tp->rx_opt.user_mss; |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1518 | tcp_parse_options(skb, &tmp_opt, &hash_location, 0, |
| 1519 | want_cookie ? NULL : &foc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1521 | if (tmp_opt.cookie_plus > 0 && |
| 1522 | tmp_opt.saw_tstamp && |
| 1523 | !tp->rx_opt.cookie_out_never && |
| 1524 | (sysctl_tcp_cookie_size > 0 || |
| 1525 | (tp->cookie_values != NULL && |
| 1526 | tp->cookie_values->cookie_desired > 0))) { |
| 1527 | u8 *c; |
| 1528 | u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS]; |
| 1529 | int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE; |
| 1530 | |
| 1531 | if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0) |
| 1532 | goto drop_and_release; |
| 1533 | |
| 1534 | /* Secret recipe starts with IP addresses */ |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 1535 | *mess++ ^= (__force u32)daddr; |
| 1536 | *mess++ ^= (__force u32)saddr; |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1537 | |
| 1538 | /* plus variable length Initiator Cookie */ |
| 1539 | c = (u8 *)mess; |
| 1540 | while (l-- > 0) |
| 1541 | *c++ ^= *hash_location++; |
| 1542 | |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1543 | want_cookie = false; /* not our kind of cookie */ |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1544 | tmp_ext.cookie_out_never = 0; /* false */ |
| 1545 | tmp_ext.cookie_plus = tmp_opt.cookie_plus; |
| 1546 | } else if (!tp->rx_opt.cookie_in_always) { |
| 1547 | /* redundant indications, but ensure initialization. */ |
| 1548 | tmp_ext.cookie_out_never = 1; /* true */ |
| 1549 | tmp_ext.cookie_plus = 0; |
| 1550 | } else { |
| 1551 | goto drop_and_release; |
| 1552 | } |
| 1553 | tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | |
Florian Westphal | 4dfc281 | 2008-04-10 03:12:40 -0700 | [diff] [blame] | 1555 | if (want_cookie && !tmp_opt.saw_tstamp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | tcp_clear_options(&tmp_opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1558 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | tcp_openreq_init(req, &tmp_opt, skb); |
| 1560 | |
David S. Miller | bb5b7c1 | 2009-12-15 20:56:42 -0800 | [diff] [blame] | 1561 | ireq = inet_rsk(req); |
| 1562 | ireq->loc_addr = daddr; |
| 1563 | ireq->rmt_addr = saddr; |
| 1564 | ireq->no_srccheck = inet_sk(sk)->transparent; |
Christoph Paasch | 5dff747 | 2012-09-26 11:59:09 +0000 | [diff] [blame] | 1565 | ireq->opt = tcp_v4_save_options(skb); |
David S. Miller | bb5b7c1 | 2009-12-15 20:56:42 -0800 | [diff] [blame] | 1566 | |
Paul Moore | 284904a | 2009-03-27 17:10:28 -0400 | [diff] [blame] | 1567 | if (security_inet_conn_request(sk, skb, req)) |
David S. Miller | bb5b7c1 | 2009-12-15 20:56:42 -0800 | [diff] [blame] | 1568 | goto drop_and_free; |
Paul Moore | 284904a | 2009-03-27 17:10:28 -0400 | [diff] [blame] | 1569 | |
Florian Westphal | 172d69e | 2010-06-21 11:48:45 +0000 | [diff] [blame] | 1570 | if (!want_cookie || tmp_opt.tstamp_ok) |
Eric Dumazet | bd14b1b | 2012-05-04 05:14:02 +0000 | [diff] [blame] | 1571 | TCP_ECN_create_request(req, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | |
| 1573 | if (want_cookie) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | isn = cookie_v4_init_sequence(sk, skb, &req->mss); |
Florian Westphal | 172d69e | 2010-06-21 11:48:45 +0000 | [diff] [blame] | 1575 | req->cookie_ts = tmp_opt.tstamp_ok; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | } else if (!isn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | /* VJ's idea. We save last timestamp seen |
| 1578 | * from the destination in peer table, when entering |
| 1579 | * state TIME-WAIT, and check against it before |
| 1580 | * accepting new connection request. |
| 1581 | * |
| 1582 | * If "isn" is not zero, this request hit alive |
| 1583 | * timewait bucket, so that all the necessary checks |
| 1584 | * are made in the function processing timewait state. |
| 1585 | */ |
| 1586 | if (tmp_opt.saw_tstamp && |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 1587 | tcp_death_row.sysctl_tw_recycle && |
David S. Miller | ba3f7f0 | 2012-07-17 14:02:46 -0700 | [diff] [blame] | 1588 | (dst = inet_csk_route_req(sk, &fl4, req)) != NULL && |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 1589 | fl4.daddr == saddr) { |
| 1590 | if (!tcp_peer_is_proven(req, dst, true)) { |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 1591 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); |
Denis V. Lunev | 7cd04fa | 2008-03-03 11:59:32 -0800 | [diff] [blame] | 1592 | goto drop_and_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1593 | } |
| 1594 | } |
| 1595 | /* Kill the following clause, if you dislike this way. */ |
| 1596 | else if (!sysctl_tcp_syncookies && |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1597 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1598 | (sysctl_max_syn_backlog >> 2)) && |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 1599 | !tcp_peer_is_proven(req, dst, false)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | /* Without syncookies last quarter of |
| 1601 | * backlog is filled with destinations, |
| 1602 | * proven to be alive. |
| 1603 | * It means that we continue to communicate |
| 1604 | * to destinations, already remembered |
| 1605 | * to the moment of synflood. |
| 1606 | */ |
Joe Perches | afd46503 | 2012-03-12 07:03:32 +0000 | [diff] [blame] | 1607 | LIMIT_NETDEBUG(KERN_DEBUG pr_fmt("drop open request from %pI4/%u\n"), |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1608 | &saddr, ntohs(tcp_hdr(skb)->source)); |
Denis V. Lunev | 7cd04fa | 2008-03-03 11:59:32 -0800 | [diff] [blame] | 1609 | goto drop_and_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | } |
| 1611 | |
Gerrit Renker | a94f723 | 2006-11-10 14:06:49 -0800 | [diff] [blame] | 1612 | isn = tcp_v4_init_sequence(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | } |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1614 | tcp_rsk(req)->snt_isn = isn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1616 | if (dst == NULL) { |
| 1617 | dst = inet_csk_route_req(sk, &fl4, req); |
| 1618 | if (dst == NULL) |
| 1619 | goto drop_and_free; |
| 1620 | } |
| 1621 | do_fastopen = tcp_fastopen_check(sk, skb, req, &foc, &valid_foc); |
| 1622 | |
| 1623 | /* We don't call tcp_v4_send_synack() directly because we need |
| 1624 | * to make sure a child socket can be created successfully before |
| 1625 | * sending back synack! |
| 1626 | * |
| 1627 | * XXX (TFO) - Ideally one would simply call tcp_v4_send_synack() |
| 1628 | * (or better yet, call tcp_send_synack() in the child context |
| 1629 | * directly, but will have to fix bunch of other code first) |
| 1630 | * after syn_recv_sock() except one will need to first fix the |
| 1631 | * latter to remove its dependency on the current implementation |
| 1632 | * of tcp_v4_send_synack()->tcp_select_initial_window(). |
| 1633 | */ |
| 1634 | skb_synack = tcp_make_synack(sk, dst, req, |
| 1635 | (struct request_values *)&tmp_ext, |
| 1636 | fastopen_cookie_present(&valid_foc) ? &valid_foc : NULL); |
| 1637 | |
| 1638 | if (skb_synack) { |
| 1639 | __tcp_v4_send_check(skb_synack, ireq->loc_addr, ireq->rmt_addr); |
| 1640 | skb_set_queue_mapping(skb_synack, skb_get_queue_mapping(skb)); |
| 1641 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1642 | goto drop_and_free; |
| 1643 | |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1644 | if (likely(!do_fastopen)) { |
| 1645 | int err; |
| 1646 | err = ip_build_and_send_pkt(skb_synack, sk, ireq->loc_addr, |
| 1647 | ireq->rmt_addr, ireq->opt); |
| 1648 | err = net_xmit_eval(err); |
| 1649 | if (err || want_cookie) |
| 1650 | goto drop_and_free; |
| 1651 | |
Neal Cardwell | 016818d | 2012-09-22 04:18:55 +0000 | [diff] [blame] | 1652 | tcp_rsk(req)->snt_synack = tcp_time_stamp; |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 1653 | tcp_rsk(req)->listener = NULL; |
| 1654 | /* Add the request_sock to the SYN table */ |
| 1655 | inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
| 1656 | if (fastopen_cookie_present(&foc) && foc.len != 0) |
| 1657 | NET_INC_STATS_BH(sock_net(sk), |
| 1658 | LINUX_MIB_TCPFASTOPENPASSIVEFAIL); |
| 1659 | } else if (tcp_v4_conn_req_fastopen(sk, skb, skb_synack, req, |
| 1660 | (struct request_values *)&tmp_ext)) |
| 1661 | goto drop_and_free; |
| 1662 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1663 | return 0; |
| 1664 | |
Denis V. Lunev | 7cd04fa | 2008-03-03 11:59:32 -0800 | [diff] [blame] | 1665 | drop_and_release: |
| 1666 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | drop_and_free: |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1668 | reqsk_free(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | drop: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | return 0; |
| 1671 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1672 | EXPORT_SYMBOL(tcp_v4_conn_request); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1673 | |
| 1674 | |
| 1675 | /* |
| 1676 | * The three way handshake has completed - we got a valid synack - |
| 1677 | * now create the new socket. |
| 1678 | */ |
| 1679 | struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1680 | struct request_sock *req, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | struct dst_entry *dst) |
| 1682 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1683 | struct inet_request_sock *ireq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | struct inet_sock *newinet; |
| 1685 | struct tcp_sock *newtp; |
| 1686 | struct sock *newsk; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1687 | #ifdef CONFIG_TCP_MD5SIG |
| 1688 | struct tcp_md5sig_key *key; |
| 1689 | #endif |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1690 | struct ip_options_rcu *inet_opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | |
| 1692 | if (sk_acceptq_is_full(sk)) |
| 1693 | goto exit_overflow; |
| 1694 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | newsk = tcp_create_openreq_child(sk, req, skb); |
| 1696 | if (!newsk) |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1697 | goto exit_nonewsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 1699 | newsk->sk_gso_type = SKB_GSO_TCPV4; |
Neal Cardwell | fae6ef8 | 2012-08-19 03:30:38 +0000 | [diff] [blame] | 1700 | inet_sk_rx_dst_set(newsk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | |
| 1702 | newtp = tcp_sk(newsk); |
| 1703 | newinet = inet_sk(newsk); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1704 | ireq = inet_rsk(req); |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1705 | newinet->inet_daddr = ireq->rmt_addr; |
| 1706 | newinet->inet_rcv_saddr = ireq->loc_addr; |
| 1707 | newinet->inet_saddr = ireq->loc_addr; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1708 | inet_opt = ireq->opt; |
| 1709 | rcu_assign_pointer(newinet->inet_opt, inet_opt); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1710 | ireq->opt = NULL; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1711 | newinet->mc_index = inet_iif(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1712 | newinet->mc_ttl = ip_hdr(skb)->ttl; |
Jiri Benc | 4c507d2 | 2012-02-09 09:35:49 +0000 | [diff] [blame] | 1713 | newinet->rcv_tos = ip_hdr(skb)->tos; |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1714 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1715 | if (inet_opt) |
| 1716 | inet_csk(newsk)->icsk_ext_hdr_len = inet_opt->opt.optlen; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1717 | newinet->inet_id = newtp->write_seq ^ jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | |
Eric Dumazet | dfd25ff | 2012-03-10 09:20:21 +0000 | [diff] [blame] | 1719 | if (!dst) { |
| 1720 | dst = inet_csk_route_child_sock(sk, newsk, req); |
| 1721 | if (!dst) |
| 1722 | goto put_and_exit; |
| 1723 | } else { |
| 1724 | /* syncookie case : see end of cookie_v4_check() */ |
| 1725 | } |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1726 | sk_setup_caps(newsk, dst); |
| 1727 | |
John Heffner | 5d424d5 | 2006-03-20 17:53:41 -0800 | [diff] [blame] | 1728 | tcp_mtup_init(newsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | tcp_sync_mss(newsk, dst_mtu(dst)); |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 1730 | newtp->advmss = dst_metric_advmss(dst); |
Tom Quetchenbach | f5fff5d | 2008-09-21 00:21:51 -0700 | [diff] [blame] | 1731 | if (tcp_sk(sk)->rx_opt.user_mss && |
| 1732 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) |
| 1733 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; |
| 1734 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | tcp_initialize_rcv_mss(newsk); |
Neal Cardwell | 623df48 | 2012-09-22 04:18:54 +0000 | [diff] [blame] | 1736 | tcp_synack_rtt_meas(newsk, req); |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 1737 | newtp->total_retrans = req->num_retrans; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1739 | #ifdef CONFIG_TCP_MD5SIG |
| 1740 | /* Copy over the MD5 key from the original socket */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1741 | key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&newinet->inet_daddr, |
| 1742 | AF_INET); |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1743 | if (key != NULL) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1744 | /* |
| 1745 | * We're using one, so create a matching key |
| 1746 | * on the newsk structure. If we fail to get |
| 1747 | * memory, then we end up not copying the key |
| 1748 | * across. Shucks. |
| 1749 | */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1750 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newinet->inet_daddr, |
| 1751 | AF_INET, key->key, key->keylen, GFP_ATOMIC); |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 1752 | sk_nocaps_add(newsk, NETIF_F_GSO_MASK); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1753 | } |
| 1754 | #endif |
| 1755 | |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1756 | if (__inet_inherit_port(sk, newsk) < 0) |
| 1757 | goto put_and_exit; |
Eric Dumazet | 9327f70 | 2009-12-04 03:46:54 +0000 | [diff] [blame] | 1758 | __inet_hash_nolisten(newsk, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | |
| 1760 | return newsk; |
| 1761 | |
| 1762 | exit_overflow: |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 1763 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1764 | exit_nonewsk: |
| 1765 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | exit: |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 1767 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | return NULL; |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1769 | put_and_exit: |
Eric Dumazet | 709e869 | 2011-11-14 10:56:56 +0000 | [diff] [blame] | 1770 | tcp_clear_xmit_timers(newsk); |
Eric Dumazet | d8a6e65 | 2011-11-30 01:02:41 +0000 | [diff] [blame] | 1771 | tcp_cleanup_congestion_control(newsk); |
Eric Dumazet | 918eb39 | 2011-11-02 12:42:56 +0000 | [diff] [blame] | 1772 | bh_unlock_sock(newsk); |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1773 | sock_put(newsk); |
| 1774 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1775 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1776 | EXPORT_SYMBOL(tcp_v4_syn_recv_sock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | |
| 1778 | static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) |
| 1779 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1780 | struct tcphdr *th = tcp_hdr(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1781 | const struct iphdr *iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | struct sock *nsk; |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1783 | struct request_sock **prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1784 | /* Find possible connection requests. */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1785 | struct request_sock *req = inet_csk_search_req(sk, &prev, th->source, |
| 1786 | iph->saddr, iph->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1787 | if (req) |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 1788 | return tcp_check_req(sk, skb, req, prev, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1790 | nsk = inet_lookup_established(sock_net(sk), &tcp_hashinfo, iph->saddr, |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 1791 | th->source, iph->daddr, th->dest, inet_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1792 | |
| 1793 | if (nsk) { |
| 1794 | if (nsk->sk_state != TCP_TIME_WAIT) { |
| 1795 | bh_lock_sock(nsk); |
| 1796 | return nsk; |
| 1797 | } |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1798 | inet_twsk_put(inet_twsk(nsk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1799 | return NULL; |
| 1800 | } |
| 1801 | |
| 1802 | #ifdef CONFIG_SYN_COOKIES |
Florian Westphal | af9b473 | 2010-06-03 00:43:44 +0000 | [diff] [blame] | 1803 | if (!th->syn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1804 | sk = cookie_v4_check(sk, skb, &(IPCB(skb)->opt)); |
| 1805 | #endif |
| 1806 | return sk; |
| 1807 | } |
| 1808 | |
Al Viro | b51655b | 2006-11-14 21:40:42 -0800 | [diff] [blame] | 1809 | static __sum16 tcp_v4_checksum_init(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1810 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1811 | const struct iphdr *iph = ip_hdr(skb); |
| 1812 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1813 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1814 | if (!tcp_v4_check(skb->len, iph->saddr, |
| 1815 | iph->daddr, skb->csum)) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1816 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1817 | return 0; |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1818 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | } |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1820 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1821 | skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1822 | skb->len, IPPROTO_TCP, 0); |
| 1823 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | if (skb->len <= 76) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1825 | return __skb_checksum_complete(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | } |
| 1827 | return 0; |
| 1828 | } |
| 1829 | |
| 1830 | |
| 1831 | /* The socket must have it's spinlock held when we get |
| 1832 | * here. |
| 1833 | * |
| 1834 | * We have a potential double-lock case here, so even when |
| 1835 | * doing backlog processing we use the BH locking scheme. |
| 1836 | * This is because we cannot sleep with the original spinlock |
| 1837 | * held. |
| 1838 | */ |
| 1839 | int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) |
| 1840 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1841 | struct sock *rsk; |
| 1842 | #ifdef CONFIG_TCP_MD5SIG |
| 1843 | /* |
| 1844 | * We really want to reject the packet as early as possible |
| 1845 | * if: |
| 1846 | * o We're expecting an MD5'd packet and this is no MD5 tcp option |
| 1847 | * o There is an MD5 option and we're not expecting one |
| 1848 | */ |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1849 | if (tcp_v4_inbound_md5_hash(sk, skb)) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1850 | goto discard; |
| 1851 | #endif |
| 1852 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1853 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
Eric Dumazet | 404e0a8 | 2012-07-29 23:20:37 +0000 | [diff] [blame] | 1854 | struct dst_entry *dst = sk->sk_rx_dst; |
| 1855 | |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1856 | sock_rps_save_rxhash(sk, skb); |
Eric Dumazet | 404e0a8 | 2012-07-29 23:20:37 +0000 | [diff] [blame] | 1857 | if (dst) { |
Eric Dumazet | 505fbcf | 2012-07-27 06:23:40 +0000 | [diff] [blame] | 1858 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || |
| 1859 | dst->ops->check(dst, 0) == NULL) { |
David S. Miller | 92101b3 | 2012-07-23 16:29:00 -0700 | [diff] [blame] | 1860 | dst_release(dst); |
| 1861 | sk->sk_rx_dst = NULL; |
| 1862 | } |
| 1863 | } |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1864 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1865 | rsk = sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | goto reset; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1867 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1868 | return 0; |
| 1869 | } |
| 1870 | |
Arnaldo Carvalho de Melo | ab6a5bb | 2007-03-18 17:43:48 -0700 | [diff] [blame] | 1871 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | goto csum_err; |
| 1873 | |
| 1874 | if (sk->sk_state == TCP_LISTEN) { |
| 1875 | struct sock *nsk = tcp_v4_hnd_req(sk, skb); |
| 1876 | if (!nsk) |
| 1877 | goto discard; |
| 1878 | |
| 1879 | if (nsk != sk) { |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1880 | sock_rps_save_rxhash(nsk, skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1881 | if (tcp_child_process(sk, nsk, skb)) { |
| 1882 | rsk = nsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1883 | goto reset; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1884 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | return 0; |
| 1886 | } |
Eric Dumazet | ca55158 | 2010-06-03 09:03:58 +0000 | [diff] [blame] | 1887 | } else |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1888 | sock_rps_save_rxhash(sk, skb); |
Eric Dumazet | ca55158 | 2010-06-03 09:03:58 +0000 | [diff] [blame] | 1889 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1890 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1891 | rsk = sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1892 | goto reset; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1893 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1894 | return 0; |
| 1895 | |
| 1896 | reset: |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1897 | tcp_v4_send_reset(rsk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1898 | discard: |
| 1899 | kfree_skb(skb); |
| 1900 | /* Be careful here. If this function gets more complicated and |
| 1901 | * gcc suffers from register pressure on the x86, sk (in %ebx) |
| 1902 | * might be destroyed here. This current version compiles correctly, |
| 1903 | * but you have been warned. |
| 1904 | */ |
| 1905 | return 0; |
| 1906 | |
| 1907 | csum_err: |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1908 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | goto discard; |
| 1910 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1911 | EXPORT_SYMBOL(tcp_v4_do_rcv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | |
David S. Miller | 160eb5a | 2012-06-27 22:01:22 -0700 | [diff] [blame] | 1913 | void tcp_v4_early_demux(struct sk_buff *skb) |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1914 | { |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1915 | const struct iphdr *iph; |
| 1916 | const struct tcphdr *th; |
| 1917 | struct sock *sk; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1918 | |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1919 | if (skb->pkt_type != PACKET_HOST) |
David S. Miller | 160eb5a | 2012-06-27 22:01:22 -0700 | [diff] [blame] | 1920 | return; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1921 | |
Eric Dumazet | 45f00f9 | 2012-10-22 21:42:47 +0000 | [diff] [blame] | 1922 | 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] | 1923 | return; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1924 | |
| 1925 | iph = ip_hdr(skb); |
Eric Dumazet | 45f00f9 | 2012-10-22 21:42:47 +0000 | [diff] [blame] | 1926 | th = tcp_hdr(skb); |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1927 | |
| 1928 | if (th->doff < sizeof(struct tcphdr) / 4) |
David S. Miller | 160eb5a | 2012-06-27 22:01:22 -0700 | [diff] [blame] | 1929 | return; |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1930 | |
Eric Dumazet | 45f00f9 | 2012-10-22 21:42:47 +0000 | [diff] [blame] | 1931 | sk = __inet_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1932 | iph->saddr, th->source, |
Vijay Subramanian | 7011d08 | 2012-06-23 17:38:10 +0000 | [diff] [blame] | 1933 | iph->daddr, ntohs(th->dest), |
Eric Dumazet | 9cb429d | 2012-07-24 01:19:31 +0000 | [diff] [blame] | 1934 | skb->skb_iif); |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1935 | if (sk) { |
| 1936 | skb->sk = sk; |
| 1937 | skb->destructor = sock_edemux; |
| 1938 | if (sk->sk_state != TCP_TIME_WAIT) { |
| 1939 | struct dst_entry *dst = sk->sk_rx_dst; |
Eric Dumazet | 505fbcf | 2012-07-27 06:23:40 +0000 | [diff] [blame] | 1940 | |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1941 | if (dst) |
| 1942 | dst = dst_check(dst, 0); |
David S. Miller | 92101b3 | 2012-07-23 16:29:00 -0700 | [diff] [blame] | 1943 | if (dst && |
Eric Dumazet | 505fbcf | 2012-07-27 06:23:40 +0000 | [diff] [blame] | 1944 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
David S. Miller | 92101b3 | 2012-07-23 16:29:00 -0700 | [diff] [blame] | 1945 | skb_dst_set_noref(skb, dst); |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1946 | } |
| 1947 | } |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1948 | } |
| 1949 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1950 | /* |
| 1951 | * From tcp_input.c |
| 1952 | */ |
| 1953 | |
| 1954 | int tcp_v4_rcv(struct sk_buff *skb) |
| 1955 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1956 | const struct iphdr *iph; |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1957 | const struct tcphdr *th; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1958 | struct sock *sk; |
| 1959 | int ret; |
Pavel Emelyanov | a86b1e3 | 2008-07-16 20:20:58 -0700 | [diff] [blame] | 1960 | struct net *net = dev_net(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1961 | |
| 1962 | if (skb->pkt_type != PACKET_HOST) |
| 1963 | goto discard_it; |
| 1964 | |
| 1965 | /* Count it even if it's bad */ |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1966 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1967 | |
| 1968 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) |
| 1969 | goto discard_it; |
| 1970 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1971 | th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1972 | |
| 1973 | if (th->doff < sizeof(struct tcphdr) / 4) |
| 1974 | goto bad_packet; |
| 1975 | if (!pskb_may_pull(skb, th->doff * 4)) |
| 1976 | goto discard_it; |
| 1977 | |
| 1978 | /* An explanation is required here, I think. |
| 1979 | * Packet length and doff are validated by header prediction, |
Stephen Hemminger | caa20d9a | 2005-11-10 17:13:47 -0800 | [diff] [blame] | 1980 | * provided case of th->doff==0 is eliminated. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1981 | * So, we defer the checks. */ |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 1982 | if (!skb_csum_unnecessary(skb) && tcp_v4_checksum_init(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1983 | goto bad_packet; |
| 1984 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1985 | th = tcp_hdr(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1986 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
| 1988 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + |
| 1989 | skb->len - th->doff * 4); |
| 1990 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); |
| 1991 | TCP_SKB_CB(skb)->when = 0; |
Eric Dumazet | b82d1bb | 2011-09-27 02:20:08 -0400 | [diff] [blame] | 1992 | TCP_SKB_CB(skb)->ip_dsfield = ipv4_get_dsfield(iph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1993 | TCP_SKB_CB(skb)->sacked = 0; |
| 1994 | |
Arnaldo Carvalho de Melo | 9a1f27c | 2008-10-07 11:41:57 -0700 | [diff] [blame] | 1995 | sk = __inet_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1996 | if (!sk) |
| 1997 | goto no_tcp_socket; |
| 1998 | |
Eric Dumazet | bb134d5 | 2010-03-09 05:55:56 +0000 | [diff] [blame] | 1999 | process: |
| 2000 | if (sk->sk_state == TCP_TIME_WAIT) |
| 2001 | goto do_time_wait; |
| 2002 | |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 2003 | if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { |
| 2004 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); |
Stephen Hemminger | d218d11 | 2010-01-11 16:28:01 -0800 | [diff] [blame] | 2005 | goto discard_and_relse; |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 2006 | } |
Stephen Hemminger | d218d11 | 2010-01-11 16:28:01 -0800 | [diff] [blame] | 2007 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2008 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 2009 | goto discard_and_relse; |
Patrick McHardy | b59c270 | 2006-01-06 23:06:10 -0800 | [diff] [blame] | 2010 | nf_reset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2011 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 2012 | if (sk_filter(sk, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2013 | goto discard_and_relse; |
| 2014 | |
| 2015 | skb->dev = NULL; |
| 2016 | |
Ingo Molnar | c636618 | 2006-07-03 00:25:13 -0700 | [diff] [blame] | 2017 | bh_lock_sock_nested(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2018 | ret = 0; |
| 2019 | if (!sock_owned_by_user(sk)) { |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 2020 | #ifdef CONFIG_NET_DMA |
| 2021 | struct tcp_sock *tp = tcp_sk(sk); |
| 2022 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
Dave Jiang | a2bd114 | 2012-04-04 16:10:46 -0700 | [diff] [blame] | 2023 | tp->ucopy.dma_chan = net_dma_find_channel(); |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 2024 | if (tp->ucopy.dma_chan) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2025 | ret = tcp_v4_do_rcv(sk, skb); |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 2026 | else |
| 2027 | #endif |
| 2028 | { |
| 2029 | if (!tcp_prequeue(sk, skb)) |
Shan Wei | ae8d7f8 | 2009-05-05 01:01:29 +0000 | [diff] [blame] | 2030 | ret = tcp_v4_do_rcv(sk, skb); |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 2031 | } |
Eric Dumazet | da882c1 | 2012-04-22 23:38:54 +0000 | [diff] [blame] | 2032 | } else if (unlikely(sk_add_backlog(sk, skb, |
| 2033 | sk->sk_rcvbuf + sk->sk_sndbuf))) { |
Zhu Yi | 6b03a53 | 2010-03-04 18:01:41 +0000 | [diff] [blame] | 2034 | bh_unlock_sock(sk); |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 2035 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
Zhu Yi | 6b03a53 | 2010-03-04 18:01:41 +0000 | [diff] [blame] | 2036 | goto discard_and_relse; |
| 2037 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | bh_unlock_sock(sk); |
| 2039 | |
| 2040 | sock_put(sk); |
| 2041 | |
| 2042 | return ret; |
| 2043 | |
| 2044 | no_tcp_socket: |
| 2045 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 2046 | goto discard_it; |
| 2047 | |
| 2048 | if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { |
| 2049 | bad_packet: |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 2050 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2051 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2052 | tcp_v4_send_reset(NULL, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2053 | } |
| 2054 | |
| 2055 | discard_it: |
| 2056 | /* Discard frame. */ |
| 2057 | kfree_skb(skb); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2058 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2059 | |
| 2060 | discard_and_relse: |
| 2061 | sock_put(sk); |
| 2062 | goto discard_it; |
| 2063 | |
| 2064 | do_time_wait: |
| 2065 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 2066 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2067 | goto discard_it; |
| 2068 | } |
| 2069 | |
| 2070 | if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 2071 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 2072 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2073 | goto discard_it; |
| 2074 | } |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 2075 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2076 | case TCP_TW_SYN: { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 2077 | struct sock *sk2 = inet_lookup_listener(dev_net(skb->dev), |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 2078 | &tcp_hashinfo, |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 2079 | iph->daddr, th->dest, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2080 | inet_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2081 | if (sk2) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 2082 | inet_twsk_deschedule(inet_twsk(sk), &tcp_death_row); |
| 2083 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | sk = sk2; |
| 2085 | goto process; |
| 2086 | } |
| 2087 | /* Fall through to ACK */ |
| 2088 | } |
| 2089 | case TCP_TW_ACK: |
| 2090 | tcp_v4_timewait_ack(sk, skb); |
| 2091 | break; |
| 2092 | case TCP_TW_RST: |
| 2093 | goto no_tcp_socket; |
| 2094 | case TCP_TW_SUCCESS:; |
| 2095 | } |
| 2096 | goto discard_it; |
| 2097 | } |
| 2098 | |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 2099 | static struct timewait_sock_ops tcp_timewait_sock_ops = { |
| 2100 | .twsk_obj_size = sizeof(struct tcp_timewait_sock), |
| 2101 | .twsk_unique = tcp_twsk_unique, |
| 2102 | .twsk_destructor= tcp_twsk_destructor, |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 2103 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | |
Eric Dumazet | 63d02d1 | 2012-08-09 14:11:00 +0000 | [diff] [blame] | 2105 | 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] | 2106 | { |
| 2107 | struct dst_entry *dst = skb_dst(skb); |
| 2108 | |
| 2109 | dst_hold(dst); |
| 2110 | sk->sk_rx_dst = dst; |
| 2111 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; |
| 2112 | } |
Eric Dumazet | 63d02d1 | 2012-08-09 14:11:00 +0000 | [diff] [blame] | 2113 | EXPORT_SYMBOL(inet_sk_rx_dst_set); |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 2114 | |
Stephen Hemminger | 3b401a8 | 2009-09-01 19:25:04 +0000 | [diff] [blame] | 2115 | const struct inet_connection_sock_af_ops ipv4_specific = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2116 | .queue_xmit = ip_queue_xmit, |
| 2117 | .send_check = tcp_v4_send_check, |
| 2118 | .rebuild_header = inet_sk_rebuild_header, |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 2119 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2120 | .conn_request = tcp_v4_conn_request, |
| 2121 | .syn_recv_sock = tcp_v4_syn_recv_sock, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2122 | .net_header_len = sizeof(struct iphdr), |
| 2123 | .setsockopt = ip_setsockopt, |
| 2124 | .getsockopt = ip_getsockopt, |
| 2125 | .addr2sockaddr = inet_csk_addr2sockaddr, |
| 2126 | .sockaddr_len = sizeof(struct sockaddr_in), |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 2127 | .bind_conflict = inet_csk_bind_conflict, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2128 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2129 | .compat_setsockopt = compat_ip_setsockopt, |
| 2130 | .compat_getsockopt = compat_ip_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2131 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2132 | }; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2133 | EXPORT_SYMBOL(ipv4_specific); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2134 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2135 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 2136 | static const struct tcp_sock_af_ops tcp_sock_ipv4_specific = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2137 | .md5_lookup = tcp_v4_md5_lookup, |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 2138 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2139 | .md5_parse = tcp_v4_parse_md5_keys, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2140 | }; |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 2141 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2143 | /* NOTE: A lot of things set to zero explicitly by call to |
| 2144 | * sk_alloc() so need not be done here. |
| 2145 | */ |
| 2146 | static int tcp_v4_init_sock(struct sock *sk) |
| 2147 | { |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2148 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2149 | |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 2150 | tcp_init_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2151 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 2152 | icsk->icsk_af_ops = &ipv4_specific; |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 2153 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2154 | #ifdef CONFIG_TCP_MD5SIG |
David S. Miller | ac807fa | 2012-04-23 03:21:58 -0400 | [diff] [blame] | 2155 | tcp_sk(sk)->af_specific = &tcp_sock_ipv4_specific; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2156 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2158 | return 0; |
| 2159 | } |
| 2160 | |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 2161 | void tcp_v4_destroy_sock(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2162 | { |
| 2163 | struct tcp_sock *tp = tcp_sk(sk); |
| 2164 | |
| 2165 | tcp_clear_xmit_timers(sk); |
| 2166 | |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2167 | tcp_cleanup_congestion_control(sk); |
Stephen Hemminger | 317a76f | 2005-06-23 12:19:55 -0700 | [diff] [blame] | 2168 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2169 | /* Cleanup up the write buffer. */ |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 2170 | tcp_write_queue_purge(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2171 | |
| 2172 | /* Cleans up our, hopefully empty, out_of_order_queue. */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2173 | __skb_queue_purge(&tp->out_of_order_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2174 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2175 | #ifdef CONFIG_TCP_MD5SIG |
| 2176 | /* Clean up the MD5 key list, if any */ |
| 2177 | if (tp->md5sig_info) { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 2178 | tcp_clear_md5_list(sk); |
Eric Dumazet | a8afca0 | 2012-01-31 18:45:40 +0000 | [diff] [blame] | 2179 | kfree_rcu(tp->md5sig_info, rcu); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2180 | tp->md5sig_info = NULL; |
| 2181 | } |
| 2182 | #endif |
| 2183 | |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 2184 | #ifdef CONFIG_NET_DMA |
| 2185 | /* Cleans up our sk_async_wait_queue */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2186 | __skb_queue_purge(&sk->sk_async_wait_queue); |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 2187 | #endif |
| 2188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2189 | /* Clean prequeue, it must be empty really */ |
| 2190 | __skb_queue_purge(&tp->ucopy.prequeue); |
| 2191 | |
| 2192 | /* Clean up a referenced TCP bind bucket. */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2193 | if (inet_csk(sk)->icsk_bind_hash) |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 2194 | inet_put_port(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2195 | |
William Allen Simpson | 435cf55 | 2009-12-02 18:17:05 +0000 | [diff] [blame] | 2196 | /* TCP Cookie Transactions */ |
| 2197 | if (tp->cookie_values != NULL) { |
| 2198 | kref_put(&tp->cookie_values->kref, |
| 2199 | tcp_cookie_values_release); |
| 2200 | tp->cookie_values = NULL; |
| 2201 | } |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 2202 | BUG_ON(tp->fastopen_rsk != NULL); |
William Allen Simpson | 435cf55 | 2009-12-02 18:17:05 +0000 | [diff] [blame] | 2203 | |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 2204 | /* If socket is aborted during connect operation */ |
| 2205 | tcp_free_fastopen_req(tp); |
| 2206 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2207 | sk_sockets_allocated_dec(sk); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 2208 | sock_release_memcg(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2209 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2210 | EXPORT_SYMBOL(tcp_v4_destroy_sock); |
| 2211 | |
| 2212 | #ifdef CONFIG_PROC_FS |
| 2213 | /* Proc filesystem TCP sock list dumping. */ |
| 2214 | |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2215 | static inline struct inet_timewait_sock *tw_head(struct hlist_nulls_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2216 | { |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2217 | return hlist_nulls_empty(head) ? NULL : |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2218 | list_entry(head->first, struct inet_timewait_sock, tw_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2219 | } |
| 2220 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2221 | static inline struct inet_timewait_sock *tw_next(struct inet_timewait_sock *tw) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2222 | { |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2223 | return !is_a_nulls(tw->tw_node.next) ? |
| 2224 | hlist_nulls_entry(tw->tw_node.next, typeof(*tw), tw_node) : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2225 | } |
| 2226 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2227 | /* |
| 2228 | * Get next listener socket follow cur. If cur is NULL, get first socket |
| 2229 | * starting from bucket given in st->bucket; when st->bucket is zero the |
| 2230 | * very first socket in the hash table is returned. |
| 2231 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2232 | static void *listening_get_next(struct seq_file *seq, void *cur) |
| 2233 | { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2234 | struct inet_connection_sock *icsk; |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 2235 | struct hlist_nulls_node *node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2236 | struct sock *sk = cur; |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2237 | struct inet_listen_hashbucket *ilb; |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2238 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 2239 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2240 | |
| 2241 | if (!sk) { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2242 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2243 | spin_lock_bh(&ilb->lock); |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 2244 | sk = sk_nulls_head(&ilb->head); |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2245 | st->offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2246 | goto get_sk; |
| 2247 | } |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2248 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | ++st->num; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2250 | ++st->offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2251 | |
| 2252 | if (st->state == TCP_SEQ_STATE_OPENREQ) { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 2253 | struct request_sock *req = cur; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2254 | |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 2255 | icsk = inet_csk(st->syn_wait_sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2256 | req = req->dl_next; |
| 2257 | while (1) { |
| 2258 | while (req) { |
Daniel Lezcano | bdccc4c | 2008-07-19 00:15:13 -0700 | [diff] [blame] | 2259 | if (req->rsk_ops->family == st->family) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2260 | cur = req; |
| 2261 | goto out; |
| 2262 | } |
| 2263 | req = req->dl_next; |
| 2264 | } |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 2265 | if (++st->sbucket >= icsk->icsk_accept_queue.listen_opt->nr_table_entries) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2266 | break; |
| 2267 | get_req: |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2268 | req = icsk->icsk_accept_queue.listen_opt->syn_table[st->sbucket]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | } |
Eric Dumazet | 1bde5ac | 2010-12-23 09:32:46 -0800 | [diff] [blame] | 2270 | sk = sk_nulls_next(st->syn_wait_sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2271 | st->state = TCP_SEQ_STATE_LISTENING; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2272 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2273 | } else { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2274 | icsk = inet_csk(sk); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2275 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
| 2276 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2277 | goto start_req; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2278 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
Eric Dumazet | 1bde5ac | 2010-12-23 09:32:46 -0800 | [diff] [blame] | 2279 | sk = sk_nulls_next(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2280 | } |
| 2281 | get_sk: |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 2282 | sk_nulls_for_each_from(sk, node) { |
Pavel Emelyanov | 8475ef9 | 2010-11-22 03:26:12 +0000 | [diff] [blame] | 2283 | if (!net_eq(sock_net(sk), net)) |
| 2284 | continue; |
| 2285 | if (sk->sk_family == st->family) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2286 | cur = sk; |
| 2287 | goto out; |
| 2288 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2289 | icsk = inet_csk(sk); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2290 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
| 2291 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2292 | start_req: |
| 2293 | st->uid = sock_i_uid(sk); |
| 2294 | st->syn_wait_sk = sk; |
| 2295 | st->state = TCP_SEQ_STATE_OPENREQ; |
| 2296 | st->sbucket = 0; |
| 2297 | goto get_req; |
| 2298 | } |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2299 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2300 | } |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2301 | spin_unlock_bh(&ilb->lock); |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2302 | st->offset = 0; |
Arnaldo Carvalho de Melo | 0f7ff92 | 2005-08-09 19:59:44 -0700 | [diff] [blame] | 2303 | if (++st->bucket < INET_LHTABLE_SIZE) { |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2304 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
| 2305 | spin_lock_bh(&ilb->lock); |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 2306 | sk = sk_nulls_head(&ilb->head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2307 | goto get_sk; |
| 2308 | } |
| 2309 | cur = NULL; |
| 2310 | out: |
| 2311 | return cur; |
| 2312 | } |
| 2313 | |
| 2314 | static void *listening_get_idx(struct seq_file *seq, loff_t *pos) |
| 2315 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2316 | struct tcp_iter_state *st = seq->private; |
| 2317 | void *rc; |
| 2318 | |
| 2319 | st->bucket = 0; |
| 2320 | st->offset = 0; |
| 2321 | rc = listening_get_next(seq, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2322 | |
| 2323 | while (rc && *pos) { |
| 2324 | rc = listening_get_next(seq, rc); |
| 2325 | --*pos; |
| 2326 | } |
| 2327 | return rc; |
| 2328 | } |
| 2329 | |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 2330 | static inline bool empty_bucket(struct tcp_iter_state *st) |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2331 | { |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2332 | return hlist_nulls_empty(&tcp_hashinfo.ehash[st->bucket].chain) && |
| 2333 | hlist_nulls_empty(&tcp_hashinfo.ehash[st->bucket].twchain); |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2334 | } |
| 2335 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2336 | /* |
| 2337 | * Get first established socket starting from bucket given in st->bucket. |
| 2338 | * If st->bucket is zero, the very first socket in the hash is returned. |
| 2339 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2340 | static void *established_get_first(struct seq_file *seq) |
| 2341 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2342 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 2343 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2344 | void *rc = NULL; |
| 2345 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2346 | st->offset = 0; |
| 2347 | for (; st->bucket <= tcp_hashinfo.ehash_mask; ++st->bucket) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2348 | struct sock *sk; |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2349 | struct hlist_nulls_node *node; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2350 | struct inet_timewait_sock *tw; |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2351 | spinlock_t *lock = inet_ehash_lockp(&tcp_hashinfo, st->bucket); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2352 | |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2353 | /* Lockless fast path for the common case of empty buckets */ |
| 2354 | if (empty_bucket(st)) |
| 2355 | continue; |
| 2356 | |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2357 | spin_lock_bh(lock); |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2358 | sk_nulls_for_each(sk, node, &tcp_hashinfo.ehash[st->bucket].chain) { |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 2359 | if (sk->sk_family != st->family || |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2360 | !net_eq(sock_net(sk), net)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2361 | continue; |
| 2362 | } |
| 2363 | rc = sk; |
| 2364 | goto out; |
| 2365 | } |
| 2366 | st->state = TCP_SEQ_STATE_TIME_WAIT; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2367 | inet_twsk_for_each(tw, node, |
Eric Dumazet | dbca9b275 | 2007-02-08 14:16:46 -0800 | [diff] [blame] | 2368 | &tcp_hashinfo.ehash[st->bucket].twchain) { |
Pavel Emelyanov | 28518fc | 2008-03-21 15:52:00 -0700 | [diff] [blame] | 2369 | if (tw->tw_family != st->family || |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2370 | !net_eq(twsk_net(tw), net)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2371 | continue; |
| 2372 | } |
| 2373 | rc = tw; |
| 2374 | goto out; |
| 2375 | } |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2376 | spin_unlock_bh(lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2377 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
| 2378 | } |
| 2379 | out: |
| 2380 | return rc; |
| 2381 | } |
| 2382 | |
| 2383 | static void *established_get_next(struct seq_file *seq, void *cur) |
| 2384 | { |
| 2385 | struct sock *sk = cur; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2386 | struct inet_timewait_sock *tw; |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2387 | struct hlist_nulls_node *node; |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2388 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 2389 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2390 | |
| 2391 | ++st->num; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2392 | ++st->offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2393 | |
| 2394 | if (st->state == TCP_SEQ_STATE_TIME_WAIT) { |
| 2395 | tw = cur; |
| 2396 | tw = tw_next(tw); |
| 2397 | get_tw: |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2398 | while (tw && (tw->tw_family != st->family || !net_eq(twsk_net(tw), net))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2399 | tw = tw_next(tw); |
| 2400 | } |
| 2401 | if (tw) { |
| 2402 | cur = tw; |
| 2403 | goto out; |
| 2404 | } |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2405 | spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2406 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
| 2407 | |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2408 | /* Look for next non empty bucket */ |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2409 | st->offset = 0; |
Eric Dumazet | f373b53 | 2009-10-09 00:16:19 +0000 | [diff] [blame] | 2410 | while (++st->bucket <= tcp_hashinfo.ehash_mask && |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2411 | empty_bucket(st)) |
| 2412 | ; |
Eric Dumazet | f373b53 | 2009-10-09 00:16:19 +0000 | [diff] [blame] | 2413 | if (st->bucket > tcp_hashinfo.ehash_mask) |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2414 | return NULL; |
| 2415 | |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2416 | spin_lock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2417 | sk = sk_nulls_head(&tcp_hashinfo.ehash[st->bucket].chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2418 | } else |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2419 | sk = sk_nulls_next(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2420 | |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2421 | sk_nulls_for_each_from(sk, node) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2422 | if (sk->sk_family == st->family && net_eq(sock_net(sk), net)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2423 | goto found; |
| 2424 | } |
| 2425 | |
| 2426 | st->state = TCP_SEQ_STATE_TIME_WAIT; |
Eric Dumazet | dbca9b275 | 2007-02-08 14:16:46 -0800 | [diff] [blame] | 2427 | tw = tw_head(&tcp_hashinfo.ehash[st->bucket].twchain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2428 | goto get_tw; |
| 2429 | found: |
| 2430 | cur = sk; |
| 2431 | out: |
| 2432 | return cur; |
| 2433 | } |
| 2434 | |
| 2435 | static void *established_get_idx(struct seq_file *seq, loff_t pos) |
| 2436 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2437 | struct tcp_iter_state *st = seq->private; |
| 2438 | void *rc; |
| 2439 | |
| 2440 | st->bucket = 0; |
| 2441 | rc = established_get_first(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2442 | |
| 2443 | while (rc && pos) { |
| 2444 | rc = established_get_next(seq, rc); |
| 2445 | --pos; |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 2446 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2447 | return rc; |
| 2448 | } |
| 2449 | |
| 2450 | static void *tcp_get_idx(struct seq_file *seq, loff_t pos) |
| 2451 | { |
| 2452 | void *rc; |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2453 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2454 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2455 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2456 | rc = listening_get_idx(seq, &pos); |
| 2457 | |
| 2458 | if (!rc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2459 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
| 2460 | rc = established_get_idx(seq, pos); |
| 2461 | } |
| 2462 | |
| 2463 | return rc; |
| 2464 | } |
| 2465 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2466 | static void *tcp_seek_last_pos(struct seq_file *seq) |
| 2467 | { |
| 2468 | struct tcp_iter_state *st = seq->private; |
| 2469 | int offset = st->offset; |
| 2470 | int orig_num = st->num; |
| 2471 | void *rc = NULL; |
| 2472 | |
| 2473 | switch (st->state) { |
| 2474 | case TCP_SEQ_STATE_OPENREQ: |
| 2475 | case TCP_SEQ_STATE_LISTENING: |
| 2476 | if (st->bucket >= INET_LHTABLE_SIZE) |
| 2477 | break; |
| 2478 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2479 | rc = listening_get_next(seq, NULL); |
| 2480 | while (offset-- && rc) |
| 2481 | rc = listening_get_next(seq, rc); |
| 2482 | if (rc) |
| 2483 | break; |
| 2484 | st->bucket = 0; |
| 2485 | /* Fallthrough */ |
| 2486 | case TCP_SEQ_STATE_ESTABLISHED: |
| 2487 | case TCP_SEQ_STATE_TIME_WAIT: |
| 2488 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
| 2489 | if (st->bucket > tcp_hashinfo.ehash_mask) |
| 2490 | break; |
| 2491 | rc = established_get_first(seq); |
| 2492 | while (offset-- && rc) |
| 2493 | rc = established_get_next(seq, rc); |
| 2494 | } |
| 2495 | |
| 2496 | st->num = orig_num; |
| 2497 | |
| 2498 | return rc; |
| 2499 | } |
| 2500 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2501 | static void *tcp_seq_start(struct seq_file *seq, loff_t *pos) |
| 2502 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2503 | struct tcp_iter_state *st = seq->private; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2504 | void *rc; |
| 2505 | |
| 2506 | if (*pos && *pos == st->last_pos) { |
| 2507 | rc = tcp_seek_last_pos(seq); |
| 2508 | if (rc) |
| 2509 | goto out; |
| 2510 | } |
| 2511 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2512 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2513 | st->num = 0; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2514 | st->bucket = 0; |
| 2515 | st->offset = 0; |
| 2516 | rc = *pos ? tcp_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| 2517 | |
| 2518 | out: |
| 2519 | st->last_pos = *pos; |
| 2520 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2521 | } |
| 2522 | |
| 2523 | static void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2524 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2525 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2526 | void *rc = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2527 | |
| 2528 | if (v == SEQ_START_TOKEN) { |
| 2529 | rc = tcp_get_idx(seq, 0); |
| 2530 | goto out; |
| 2531 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2532 | |
| 2533 | switch (st->state) { |
| 2534 | case TCP_SEQ_STATE_OPENREQ: |
| 2535 | case TCP_SEQ_STATE_LISTENING: |
| 2536 | rc = listening_get_next(seq, v); |
| 2537 | if (!rc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2538 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2539 | st->bucket = 0; |
| 2540 | st->offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2541 | rc = established_get_first(seq); |
| 2542 | } |
| 2543 | break; |
| 2544 | case TCP_SEQ_STATE_ESTABLISHED: |
| 2545 | case TCP_SEQ_STATE_TIME_WAIT: |
| 2546 | rc = established_get_next(seq, v); |
| 2547 | break; |
| 2548 | } |
| 2549 | out: |
| 2550 | ++*pos; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2551 | st->last_pos = *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2552 | return rc; |
| 2553 | } |
| 2554 | |
| 2555 | static void tcp_seq_stop(struct seq_file *seq, void *v) |
| 2556 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2557 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2558 | |
| 2559 | switch (st->state) { |
| 2560 | case TCP_SEQ_STATE_OPENREQ: |
| 2561 | if (v) { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2562 | struct inet_connection_sock *icsk = inet_csk(st->syn_wait_sk); |
| 2563 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2564 | } |
| 2565 | case TCP_SEQ_STATE_LISTENING: |
| 2566 | if (v != SEQ_START_TOKEN) |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2567 | spin_unlock_bh(&tcp_hashinfo.listening_hash[st->bucket].lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2568 | break; |
| 2569 | case TCP_SEQ_STATE_TIME_WAIT: |
| 2570 | case TCP_SEQ_STATE_ESTABLISHED: |
| 2571 | if (v) |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2572 | spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2573 | break; |
| 2574 | } |
| 2575 | } |
| 2576 | |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2577 | int tcp_seq_open(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2578 | { |
| 2579 | struct tcp_seq_afinfo *afinfo = PDE(inode)->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2580 | struct tcp_iter_state *s; |
Denis V. Lunev | 52d6f3f | 2008-04-13 22:12:41 -0700 | [diff] [blame] | 2581 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2582 | |
Denis V. Lunev | 52d6f3f | 2008-04-13 22:12:41 -0700 | [diff] [blame] | 2583 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
| 2584 | sizeof(struct tcp_iter_state)); |
| 2585 | if (err < 0) |
| 2586 | return err; |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 2587 | |
Denis V. Lunev | 52d6f3f | 2008-04-13 22:12:41 -0700 | [diff] [blame] | 2588 | s = ((struct seq_file *)file->private_data)->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2589 | s->family = afinfo->family; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2590 | s->last_pos = 0; |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 2591 | return 0; |
| 2592 | } |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2593 | EXPORT_SYMBOL(tcp_seq_open); |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 2594 | |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2595 | int tcp_proc_register(struct net *net, struct tcp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2596 | { |
| 2597 | int rc = 0; |
| 2598 | struct proc_dir_entry *p; |
| 2599 | |
Denis V. Lunev | 9427c4b | 2008-04-13 22:12:13 -0700 | [diff] [blame] | 2600 | afinfo->seq_ops.start = tcp_seq_start; |
| 2601 | afinfo->seq_ops.next = tcp_seq_next; |
| 2602 | afinfo->seq_ops.stop = tcp_seq_stop; |
| 2603 | |
Denis V. Lunev | 84841c3 | 2008-05-02 04:10:08 -0700 | [diff] [blame] | 2604 | 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] | 2605 | afinfo->seq_fops, afinfo); |
Denis V. Lunev | 84841c3 | 2008-05-02 04:10:08 -0700 | [diff] [blame] | 2606 | if (!p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2607 | rc = -ENOMEM; |
| 2608 | return rc; |
| 2609 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2610 | EXPORT_SYMBOL(tcp_proc_register); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2611 | |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2612 | void tcp_proc_unregister(struct net *net, struct tcp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2613 | { |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2614 | proc_net_remove(net, afinfo->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2615 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2616 | EXPORT_SYMBOL(tcp_proc_unregister); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2617 | |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2618 | static void get_openreq4(const struct sock *sk, const struct request_sock *req, |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 2619 | struct seq_file *f, int i, kuid_t uid, int *len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2620 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2621 | const struct inet_request_sock *ireq = inet_rsk(req); |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2622 | long delta = req->expires - jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2623 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2624 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
Dan Rosenberg | 71338aa | 2011-05-23 12:17:35 +0000 | [diff] [blame] | 2625 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %u %d %pK%n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2626 | i, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2627 | ireq->loc_addr, |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 2628 | ntohs(inet_sk(sk)->inet_sport), |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2629 | ireq->rmt_addr, |
| 2630 | ntohs(ireq->rmt_port), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2631 | TCP_SYN_RECV, |
| 2632 | 0, 0, /* could print option size, but that is af dependent. */ |
| 2633 | 1, /* timers active (only the expire timer) */ |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2634 | jiffies_delta_to_clock_t(delta), |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 2635 | req->num_timeout, |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 2636 | from_kuid_munged(seq_user_ns(f), uid), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2637 | 0, /* non standard timer */ |
| 2638 | 0, /* open_requests have no inode */ |
| 2639 | atomic_read(&sk->sk_refcnt), |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2640 | req, |
| 2641 | len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2642 | } |
| 2643 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2644 | static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i, int *len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2645 | { |
| 2646 | int timer_active; |
| 2647 | unsigned long timer_expires; |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2648 | const struct tcp_sock *tp = tcp_sk(sk); |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2649 | const struct inet_connection_sock *icsk = inet_csk(sk); |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2650 | const struct inet_sock *inet = inet_sk(sk); |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 2651 | struct fastopen_queue *fastopenq = icsk->icsk_accept_queue.fastopenq; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 2652 | __be32 dest = inet->inet_daddr; |
| 2653 | __be32 src = inet->inet_rcv_saddr; |
| 2654 | __u16 destp = ntohs(inet->inet_dport); |
| 2655 | __u16 srcp = ntohs(inet->inet_sport); |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2656 | int rx_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2657 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2658 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2659 | timer_active = 1; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2660 | timer_expires = icsk->icsk_timeout; |
| 2661 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2662 | timer_active = 4; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2663 | timer_expires = icsk->icsk_timeout; |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2664 | } else if (timer_pending(&sk->sk_timer)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2665 | timer_active = 2; |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2666 | timer_expires = sk->sk_timer.expires; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2667 | } else { |
| 2668 | timer_active = 0; |
| 2669 | timer_expires = jiffies; |
| 2670 | } |
| 2671 | |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2672 | if (sk->sk_state == TCP_LISTEN) |
| 2673 | rx_queue = sk->sk_ack_backlog; |
| 2674 | else |
| 2675 | /* |
| 2676 | * because we dont lock socket, we might find a transient negative value |
| 2677 | */ |
| 2678 | rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); |
| 2679 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2680 | seq_printf(f, "%4d: %08X:%04X %08X:%04X %02X %08X:%08X %02X:%08lX " |
Dan Rosenberg | 71338aa | 2011-05-23 12:17:35 +0000 | [diff] [blame] | 2681 | "%08X %5d %8d %lu %d %pK %lu %lu %u %u %d%n", |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2682 | i, src, srcp, dest, destp, sk->sk_state, |
Sridhar Samudrala | 47da8ee | 2006-06-27 13:29:00 -0700 | [diff] [blame] | 2683 | tp->write_seq - tp->snd_una, |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2684 | rx_queue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2685 | timer_active, |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2686 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2687 | icsk->icsk_retransmits, |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 2688 | 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] | 2689 | icsk->icsk_probes_out, |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2690 | sock_i_ino(sk), |
| 2691 | atomic_read(&sk->sk_refcnt), sk, |
Stephen Hemminger | 7be8735 | 2008-06-27 20:00:19 -0700 | [diff] [blame] | 2692 | jiffies_to_clock_t(icsk->icsk_rto), |
| 2693 | jiffies_to_clock_t(icsk->icsk_ack.ato), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2694 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2695 | tp->snd_cwnd, |
Jerry Chu | 168a8f5 | 2012-08-31 12:29:13 +0000 | [diff] [blame] | 2696 | sk->sk_state == TCP_LISTEN ? |
| 2697 | (fastopenq ? fastopenq->max_qlen : 0) : |
| 2698 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh), |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2699 | len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2700 | } |
| 2701 | |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2702 | static void get_timewait4_sock(const struct inet_timewait_sock *tw, |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2703 | struct seq_file *f, int i, int *len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2704 | { |
Al Viro | 23f33c2 | 2006-09-27 18:43:50 -0700 | [diff] [blame] | 2705 | __be32 dest, src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2706 | __u16 destp, srcp; |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2707 | long delta = tw->tw_ttd - jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2708 | |
| 2709 | dest = tw->tw_daddr; |
| 2710 | src = tw->tw_rcv_saddr; |
| 2711 | destp = ntohs(tw->tw_dport); |
| 2712 | srcp = ntohs(tw->tw_sport); |
| 2713 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2714 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
Dan Rosenberg | 71338aa | 2011-05-23 12:17:35 +0000 | [diff] [blame] | 2715 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK%n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2716 | i, src, srcp, dest, destp, tw->tw_substate, 0, 0, |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 2717 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2718 | atomic_read(&tw->tw_refcnt), tw, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2719 | } |
| 2720 | |
| 2721 | #define TMPSZ 150 |
| 2722 | |
| 2723 | static int tcp4_seq_show(struct seq_file *seq, void *v) |
| 2724 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2725 | struct tcp_iter_state *st; |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2726 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2727 | |
| 2728 | if (v == SEQ_START_TOKEN) { |
| 2729 | seq_printf(seq, "%-*s\n", TMPSZ - 1, |
| 2730 | " sl local_address rem_address st tx_queue " |
| 2731 | "rx_queue tr tm->when retrnsmt uid timeout " |
| 2732 | "inode"); |
| 2733 | goto out; |
| 2734 | } |
| 2735 | st = seq->private; |
| 2736 | |
| 2737 | switch (st->state) { |
| 2738 | case TCP_SEQ_STATE_LISTENING: |
| 2739 | case TCP_SEQ_STATE_ESTABLISHED: |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2740 | get_tcp4_sock(v, seq, st->num, &len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2741 | break; |
| 2742 | case TCP_SEQ_STATE_OPENREQ: |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2743 | get_openreq4(st->syn_wait_sk, v, seq, st->num, st->uid, &len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2744 | break; |
| 2745 | case TCP_SEQ_STATE_TIME_WAIT: |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2746 | get_timewait4_sock(v, seq, st->num, &len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2747 | break; |
| 2748 | } |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2749 | seq_printf(seq, "%*s\n", TMPSZ - 1 - len, ""); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2750 | out: |
| 2751 | return 0; |
| 2752 | } |
| 2753 | |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2754 | static const struct file_operations tcp_afinfo_seq_fops = { |
| 2755 | .owner = THIS_MODULE, |
| 2756 | .open = tcp_seq_open, |
| 2757 | .read = seq_read, |
| 2758 | .llseek = seq_lseek, |
| 2759 | .release = seq_release_net |
| 2760 | }; |
| 2761 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2762 | static struct tcp_seq_afinfo tcp4_seq_afinfo = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2763 | .name = "tcp", |
| 2764 | .family = AF_INET, |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2765 | .seq_fops = &tcp_afinfo_seq_fops, |
Denis V. Lunev | 9427c4b | 2008-04-13 22:12:13 -0700 | [diff] [blame] | 2766 | .seq_ops = { |
| 2767 | .show = tcp4_seq_show, |
| 2768 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2769 | }; |
| 2770 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2771 | static int __net_init tcp4_proc_init_net(struct net *net) |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2772 | { |
| 2773 | return tcp_proc_register(net, &tcp4_seq_afinfo); |
| 2774 | } |
| 2775 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2776 | static void __net_exit tcp4_proc_exit_net(struct net *net) |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2777 | { |
| 2778 | tcp_proc_unregister(net, &tcp4_seq_afinfo); |
| 2779 | } |
| 2780 | |
| 2781 | static struct pernet_operations tcp4_net_ops = { |
| 2782 | .init = tcp4_proc_init_net, |
| 2783 | .exit = tcp4_proc_exit_net, |
| 2784 | }; |
| 2785 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2786 | int __init tcp4_proc_init(void) |
| 2787 | { |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2788 | return register_pernet_subsys(&tcp4_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2789 | } |
| 2790 | |
| 2791 | void tcp4_proc_exit(void) |
| 2792 | { |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2793 | unregister_pernet_subsys(&tcp4_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2794 | } |
| 2795 | #endif /* CONFIG_PROC_FS */ |
| 2796 | |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2797 | struct sk_buff **tcp4_gro_receive(struct sk_buff **head, struct sk_buff *skb) |
| 2798 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 2799 | const struct iphdr *iph = skb_gro_network_header(skb); |
Eric Dumazet | 861b650 | 2012-09-27 02:14:53 +0000 | [diff] [blame] | 2800 | __wsum wsum; |
| 2801 | __sum16 sum; |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2802 | |
| 2803 | switch (skb->ip_summed) { |
| 2804 | case CHECKSUM_COMPLETE: |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 2805 | if (!tcp_v4_check(skb_gro_len(skb), iph->saddr, iph->daddr, |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2806 | skb->csum)) { |
| 2807 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 2808 | break; |
| 2809 | } |
Eric Dumazet | 861b650 | 2012-09-27 02:14:53 +0000 | [diff] [blame] | 2810 | flush: |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2811 | NAPI_GRO_CB(skb)->flush = 1; |
| 2812 | return NULL; |
Eric Dumazet | 861b650 | 2012-09-27 02:14:53 +0000 | [diff] [blame] | 2813 | |
| 2814 | case CHECKSUM_NONE: |
| 2815 | wsum = csum_tcpudp_nofold(iph->saddr, iph->daddr, |
| 2816 | skb_gro_len(skb), IPPROTO_TCP, 0); |
| 2817 | sum = csum_fold(skb_checksum(skb, |
| 2818 | skb_gro_offset(skb), |
| 2819 | skb_gro_len(skb), |
| 2820 | wsum)); |
| 2821 | if (sum) |
| 2822 | goto flush; |
| 2823 | |
| 2824 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 2825 | break; |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2826 | } |
| 2827 | |
| 2828 | return tcp_gro_receive(head, skb); |
| 2829 | } |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2830 | |
| 2831 | int tcp4_gro_complete(struct sk_buff *skb) |
| 2832 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 2833 | const struct iphdr *iph = ip_hdr(skb); |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2834 | struct tcphdr *th = tcp_hdr(skb); |
| 2835 | |
| 2836 | th->check = ~tcp_v4_check(skb->len - skb_transport_offset(skb), |
| 2837 | iph->saddr, iph->daddr, 0); |
| 2838 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
| 2839 | |
| 2840 | return tcp_gro_complete(skb); |
| 2841 | } |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2842 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2843 | struct proto tcp_prot = { |
| 2844 | .name = "TCP", |
| 2845 | .owner = THIS_MODULE, |
| 2846 | .close = tcp_close, |
| 2847 | .connect = tcp_v4_connect, |
| 2848 | .disconnect = tcp_disconnect, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2849 | .accept = inet_csk_accept, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2850 | .ioctl = tcp_ioctl, |
| 2851 | .init = tcp_v4_init_sock, |
| 2852 | .destroy = tcp_v4_destroy_sock, |
| 2853 | .shutdown = tcp_shutdown, |
| 2854 | .setsockopt = tcp_setsockopt, |
| 2855 | .getsockopt = tcp_getsockopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2856 | .recvmsg = tcp_recvmsg, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 2857 | .sendmsg = tcp_sendmsg, |
| 2858 | .sendpage = tcp_sendpage, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2859 | .backlog_rcv = tcp_v4_do_rcv, |
Eric Dumazet | 46d3cea | 2012-07-11 05:50:31 +0000 | [diff] [blame] | 2860 | .release_cb = tcp_release_cb, |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 2861 | .mtu_reduced = tcp_v4_mtu_reduced, |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 2862 | .hash = inet_hash, |
| 2863 | .unhash = inet_unhash, |
| 2864 | .get_port = inet_csk_get_port, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2865 | .enter_memory_pressure = tcp_enter_memory_pressure, |
| 2866 | .sockets_allocated = &tcp_sockets_allocated, |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 2867 | .orphan_count = &tcp_orphan_count, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2868 | .memory_allocated = &tcp_memory_allocated, |
| 2869 | .memory_pressure = &tcp_memory_pressure, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2870 | .sysctl_wmem = sysctl_tcp_wmem, |
| 2871 | .sysctl_rmem = sysctl_tcp_rmem, |
| 2872 | .max_header = MAX_TCP_HEADER, |
| 2873 | .obj_size = sizeof(struct tcp_sock), |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2874 | .slab_flags = SLAB_DESTROY_BY_RCU, |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2875 | .twsk_prot = &tcp_timewait_sock_ops, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 2876 | .rsk_prot = &tcp_request_sock_ops, |
Pavel Emelyanov | 39d8cda | 2008-03-22 16:50:58 -0700 | [diff] [blame] | 2877 | .h.hashinfo = &tcp_hashinfo, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 2878 | .no_autobind = true, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2879 | #ifdef CONFIG_COMPAT |
| 2880 | .compat_setsockopt = compat_tcp_setsockopt, |
| 2881 | .compat_getsockopt = compat_tcp_getsockopt, |
| 2882 | #endif |
Andrew Morton | c255a45 | 2012-07-31 16:43:02 -0700 | [diff] [blame] | 2883 | #ifdef CONFIG_MEMCG_KMEM |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 2884 | .init_cgroup = tcp_init_cgroup, |
| 2885 | .destroy_cgroup = tcp_destroy_cgroup, |
| 2886 | .proto_cgroup = tcp_proto_cgroup, |
| 2887 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2888 | }; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2889 | EXPORT_SYMBOL(tcp_prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2890 | |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2891 | static int __net_init tcp_sk_init(struct net *net) |
| 2892 | { |
Eric Dumazet | be9f4a4 | 2012-07-19 07:34:03 +0000 | [diff] [blame] | 2893 | return 0; |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2894 | } |
| 2895 | |
| 2896 | static void __net_exit tcp_sk_exit(struct net *net) |
| 2897 | { |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 2898 | } |
| 2899 | |
| 2900 | static void __net_exit tcp_sk_exit_batch(struct list_head *net_exit_list) |
| 2901 | { |
| 2902 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET); |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2903 | } |
| 2904 | |
| 2905 | static struct pernet_operations __net_initdata tcp_sk_ops = { |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 2906 | .init = tcp_sk_init, |
| 2907 | .exit = tcp_sk_exit, |
| 2908 | .exit_batch = tcp_sk_exit_batch, |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2909 | }; |
| 2910 | |
Denis V. Lunev | 9b0f976 | 2008-02-29 11:13:15 -0800 | [diff] [blame] | 2911 | void __init tcp_v4_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2912 | { |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2913 | inet_hashinfo_init(&tcp_hashinfo); |
Eric W. Biederman | 6a1b305 | 2009-02-22 00:10:18 -0800 | [diff] [blame] | 2914 | if (register_pernet_subsys(&tcp_sk_ops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2915 | panic("Failed to create the TCP control socket.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2916 | } |