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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
Herbert Xu | eb4dea5 | 2008-12-29 23:04:08 -0800 | [diff] [blame] | 54 | #include <linux/bottom_half.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #include <linux/types.h> |
| 56 | #include <linux/fcntl.h> |
| 57 | #include <linux/module.h> |
| 58 | #include <linux/random.h> |
| 59 | #include <linux/cache.h> |
| 60 | #include <linux/jhash.h> |
| 61 | #include <linux/init.h> |
| 62 | #include <linux/times.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 63 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 65 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #include <net/icmp.h> |
Arnaldo Carvalho de Melo | 304a161 | 2005-08-09 19:59:20 -0700 | [diff] [blame] | 67 | #include <net/inet_hashtables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | #include <net/tcp.h> |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 69 | #include <net/transp_v6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | #include <net/ipv6.h> |
| 71 | #include <net/inet_common.h> |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 72 | #include <net/timewait_sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | #include <net/xfrm.h> |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 74 | #include <net/netdma.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
| 76 | #include <linux/inet.h> |
| 77 | #include <linux/ipv6.h> |
| 78 | #include <linux/stddef.h> |
| 79 | #include <linux/proc_fs.h> |
| 80 | #include <linux/seq_file.h> |
| 81 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 82 | #include <linux/crypto.h> |
| 83 | #include <linux/scatterlist.h> |
| 84 | |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 85 | int sysctl_tcp_tw_reuse __read_mostly; |
| 86 | int sysctl_tcp_low_latency __read_mostly; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 87 | EXPORT_SYMBOL(sysctl_tcp_low_latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 90 | #ifdef CONFIG_TCP_MD5SIG |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 91 | static struct tcp_md5sig_key *tcp_v4_md5_do_lookup(struct sock *sk, |
| 92 | __be32 addr); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 93 | static int tcp_v4_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
| 94 | __be32 daddr, __be32 saddr, struct tcphdr *th); |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 95 | #else |
| 96 | static inline |
| 97 | struct tcp_md5sig_key *tcp_v4_md5_do_lookup(struct sock *sk, __be32 addr) |
| 98 | { |
| 99 | return NULL; |
| 100 | } |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 101 | #endif |
| 102 | |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 103 | struct inet_hashinfo tcp_hashinfo; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 104 | EXPORT_SYMBOL(tcp_hashinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | |
Gerrit Renker | a94f723 | 2006-11-10 14:06:49 -0800 | [diff] [blame] | 106 | static inline __u32 tcp_v4_init_sequence(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 108 | return secure_tcp_sequence_number(ip_hdr(skb)->daddr, |
| 109 | ip_hdr(skb)->saddr, |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 110 | tcp_hdr(skb)->dest, |
| 111 | tcp_hdr(skb)->source); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | } |
| 113 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 114 | int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp) |
| 115 | { |
| 116 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sktw); |
| 117 | struct tcp_sock *tp = tcp_sk(sk); |
| 118 | |
| 119 | /* With PAWS, it is safe from the viewpoint |
| 120 | of data integrity. Even without PAWS it is safe provided sequence |
| 121 | spaces do not overlap i.e. at data rates <= 80Mbit/sec. |
| 122 | |
| 123 | Actually, the idea is close to VJ's one, only timestamp cache is |
| 124 | held not per host, but per port pair and TW bucket is used as state |
| 125 | holder. |
| 126 | |
| 127 | If TW bucket has been already destroyed we fall back to VJ's scheme |
| 128 | and use initial timestamp retrieved from peer table. |
| 129 | */ |
| 130 | if (tcptw->tw_ts_recent_stamp && |
| 131 | (twp == NULL || (sysctl_tcp_tw_reuse && |
James Morris | 9d729f7 | 2007-03-04 16:12:44 -0800 | [diff] [blame] | 132 | get_seconds() - tcptw->tw_ts_recent_stamp > 1))) { |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 133 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; |
| 134 | if (tp->write_seq == 0) |
| 135 | tp->write_seq = 1; |
| 136 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; |
| 137 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; |
| 138 | sock_hold(sktw); |
| 139 | return 1; |
| 140 | } |
| 141 | |
| 142 | return 0; |
| 143 | } |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 144 | EXPORT_SYMBOL_GPL(tcp_twsk_unique); |
| 145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | /* This will initiate an outgoing connection. */ |
| 147 | int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
| 148 | { |
David S. Miller | 2d7192d | 2011-04-26 13:28:44 -0700 | [diff] [blame] | 149 | struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | struct inet_sock *inet = inet_sk(sk); |
| 151 | struct tcp_sock *tp = tcp_sk(sk); |
David S. Miller | dca8b08 | 2011-02-24 13:38:12 -0800 | [diff] [blame] | 152 | __be16 orig_sport, orig_dport; |
Al Viro | bada8ad | 2006-09-26 21:27:15 -0700 | [diff] [blame] | 153 | __be32 daddr, nexthop; |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 154 | struct flowi4 *fl4; |
David S. Miller | 2d7192d | 2011-04-26 13:28:44 -0700 | [diff] [blame] | 155 | struct rtable *rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | int err; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 157 | struct ip_options_rcu *inet_opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
| 159 | if (addr_len < sizeof(struct sockaddr_in)) |
| 160 | return -EINVAL; |
| 161 | |
| 162 | if (usin->sin_family != AF_INET) |
| 163 | return -EAFNOSUPPORT; |
| 164 | |
| 165 | nexthop = daddr = usin->sin_addr.s_addr; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 166 | inet_opt = rcu_dereference_protected(inet->inet_opt, |
| 167 | sock_owned_by_user(sk)); |
| 168 | if (inet_opt && inet_opt->opt.srr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | if (!daddr) |
| 170 | return -EINVAL; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 171 | nexthop = inet_opt->opt.faddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | } |
| 173 | |
David S. Miller | dca8b08 | 2011-02-24 13:38:12 -0800 | [diff] [blame] | 174 | orig_sport = inet->inet_sport; |
| 175 | orig_dport = usin->sin_port; |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 176 | fl4 = &inet->cork.fl.u.ip4; |
| 177 | rt = ip_route_connect(fl4, nexthop, inet->inet_saddr, |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 178 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, |
| 179 | IPPROTO_TCP, |
| 180 | orig_sport, orig_dport, sk, true); |
| 181 | if (IS_ERR(rt)) { |
| 182 | err = PTR_ERR(rt); |
| 183 | if (err == -ENETUNREACH) |
Pavel Emelyanov | 7c73a6f | 2008-07-16 20:20:11 -0700 | [diff] [blame] | 184 | IP_INC_STATS_BH(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 185 | return err; |
Wei Dong | 584bdf8 | 2007-05-31 22:49:28 -0700 | [diff] [blame] | 186 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | |
| 188 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { |
| 189 | ip_rt_put(rt); |
| 190 | return -ENETUNREACH; |
| 191 | } |
| 192 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 193 | if (!inet_opt || !inet_opt->opt.srr) |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 194 | daddr = fl4->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 196 | if (!inet->inet_saddr) |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 197 | inet->inet_saddr = fl4->saddr; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 198 | inet->inet_rcv_saddr = inet->inet_saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 200 | if (tp->rx_opt.ts_recent_stamp && inet->inet_daddr != daddr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | /* Reset inherited state */ |
| 202 | tp->rx_opt.ts_recent = 0; |
| 203 | tp->rx_opt.ts_recent_stamp = 0; |
| 204 | tp->write_seq = 0; |
| 205 | } |
| 206 | |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 207 | if (tcp_death_row.sysctl_tw_recycle && |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 208 | !tp->rx_opt.ts_recent_stamp && fl4->daddr == daddr) { |
David S. Miller | ed2361e | 2011-05-18 18:38:54 -0400 | [diff] [blame] | 209 | struct inet_peer *peer = rt_get_peer(rt, fl4->daddr); |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 210 | /* |
| 211 | * VJ's idea. We save last timestamp seen from |
| 212 | * the destination in peer table, when entering state |
| 213 | * TIME-WAIT * and initialize rx_opt.ts_recent from it, |
| 214 | * when trying new connection. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | */ |
Eric Dumazet | 317fe0e | 2010-06-16 04:52:13 +0000 | [diff] [blame] | 216 | if (peer) { |
| 217 | inet_peer_refcheck(peer); |
| 218 | if ((u32)get_seconds() - peer->tcp_ts_stamp <= TCP_PAWS_MSL) { |
| 219 | tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp; |
| 220 | tp->rx_opt.ts_recent = peer->tcp_ts; |
| 221 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | } |
| 223 | } |
| 224 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 225 | inet->inet_dport = usin->sin_port; |
| 226 | inet->inet_daddr = daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 228 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 229 | if (inet_opt) |
| 230 | inet_csk(sk)->icsk_ext_hdr_len = inet_opt->opt.optlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
William Allen Simpson | bee7ca9 | 2009-11-10 09:51:18 +0000 | [diff] [blame] | 232 | tp->rx_opt.mss_clamp = TCP_MSS_DEFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | |
| 234 | /* Socket identity is still unknown (sport may be zero). |
| 235 | * However we set state to SYN-SENT and not releasing socket |
| 236 | * lock select source port, enter ourselves into the hash tables and |
| 237 | * complete initialization after this. |
| 238 | */ |
| 239 | tcp_set_state(sk, TCP_SYN_SENT); |
Arnaldo Carvalho de Melo | a7f5e7f | 2005-12-13 23:25:31 -0800 | [diff] [blame] | 240 | err = inet_hash_connect(&tcp_death_row, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | if (err) |
| 242 | goto failure; |
| 243 | |
David S. Miller | da905bd | 2011-05-06 16:11:19 -0700 | [diff] [blame] | 244 | rt = ip_route_newports(fl4, rt, orig_sport, orig_dport, |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 245 | inet->inet_sport, inet->inet_dport, sk); |
| 246 | if (IS_ERR(rt)) { |
| 247 | err = PTR_ERR(rt); |
| 248 | rt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | goto failure; |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 250 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | /* OK, now commit destination to socket. */ |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 252 | sk->sk_gso_type = SKB_GSO_TCPV4; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 253 | sk_setup_caps(sk, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
| 255 | if (!tp->write_seq) |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 256 | tp->write_seq = secure_tcp_sequence_number(inet->inet_saddr, |
| 257 | inet->inet_daddr, |
| 258 | inet->inet_sport, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | usin->sin_port); |
| 260 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 261 | inet->inet_id = tp->write_seq ^ jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
| 263 | err = tcp_connect(sk); |
| 264 | rt = NULL; |
| 265 | if (err) |
| 266 | goto failure; |
| 267 | |
| 268 | return 0; |
| 269 | |
| 270 | failure: |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 271 | /* |
| 272 | * This unhashes the socket and releases the local port, |
| 273 | * if necessary. |
| 274 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | tcp_set_state(sk, TCP_CLOSE); |
| 276 | ip_rt_put(rt); |
| 277 | sk->sk_route_caps = 0; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 278 | inet->inet_dport = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | return err; |
| 280 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 281 | EXPORT_SYMBOL(tcp_v4_connect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | /* |
| 284 | * This routine does path mtu discovery as defined in RFC1191. |
| 285 | */ |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 286 | static void do_pmtu_discovery(struct sock *sk, const struct iphdr *iph, u32 mtu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | { |
| 288 | struct dst_entry *dst; |
| 289 | struct inet_sock *inet = inet_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
| 291 | /* We are not interested in TCP_LISTEN and open_requests (SYN-ACKs |
| 292 | * send out by Linux are always <576bytes so they should go through |
| 293 | * unfragmented). |
| 294 | */ |
| 295 | if (sk->sk_state == TCP_LISTEN) |
| 296 | return; |
| 297 | |
| 298 | /* We don't check in the destentry if pmtu discovery is forbidden |
| 299 | * on this route. We just assume that no packet_to_big packets |
| 300 | * are send back when pmtu discovery is not active. |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 301 | * There is a small race when the user changes this flag in the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | * route, but I think that's acceptable. |
| 303 | */ |
| 304 | if ((dst = __sk_dst_check(sk, 0)) == NULL) |
| 305 | return; |
| 306 | |
| 307 | dst->ops->update_pmtu(dst, mtu); |
| 308 | |
| 309 | /* Something is about to be wrong... Remember soft error |
| 310 | * for the case, if this connection will not able to recover. |
| 311 | */ |
| 312 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) |
| 313 | sk->sk_err_soft = EMSGSIZE; |
| 314 | |
| 315 | mtu = dst_mtu(dst); |
| 316 | |
| 317 | if (inet->pmtudisc != IP_PMTUDISC_DONT && |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 318 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | tcp_sync_mss(sk, mtu); |
| 320 | |
| 321 | /* Resend the TCP packet because it's |
| 322 | * clear that the old packet has been |
| 323 | * dropped. This is the new "fast" path mtu |
| 324 | * discovery. |
| 325 | */ |
| 326 | tcp_simple_retransmit(sk); |
| 327 | } /* else let the usual retransmit timer handle it */ |
| 328 | } |
| 329 | |
| 330 | /* |
| 331 | * This routine is called by the ICMP module when it gets some |
| 332 | * sort of error condition. If err < 0 then the socket should |
| 333 | * be closed and the error returned to the user. If err > 0 |
| 334 | * it's just the icmp type << 8 | icmp code. After adjustment |
| 335 | * header points to the first 8 bytes of the tcp header. We need |
| 336 | * to find the appropriate port. |
| 337 | * |
| 338 | * The locking strategy used here is very "optimistic". When |
| 339 | * someone else accesses the socket the ICMP is just dropped |
| 340 | * and for some paths there is no check at all. |
| 341 | * A more general error queue to queue errors for later handling |
| 342 | * is probably better. |
| 343 | * |
| 344 | */ |
| 345 | |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 346 | void tcp_v4_err(struct sk_buff *icmp_skb, u32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 348 | const struct iphdr *iph = (const struct iphdr *)icmp_skb->data; |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 349 | struct tcphdr *th = (struct tcphdr *)(icmp_skb->data + (iph->ihl << 2)); |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 350 | struct inet_connection_sock *icsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | struct tcp_sock *tp; |
| 352 | struct inet_sock *inet; |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 353 | const int type = icmp_hdr(icmp_skb)->type; |
| 354 | const int code = icmp_hdr(icmp_skb)->code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | struct sock *sk; |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 356 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | __u32 seq; |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 358 | __u32 remaining; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | int err; |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 360 | struct net *net = dev_net(icmp_skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 362 | if (icmp_skb->len < (iph->ihl << 2) + 8) { |
Pavel Emelyanov | dcfc23c | 2008-07-14 23:03:00 -0700 | [diff] [blame] | 363 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | return; |
| 365 | } |
| 366 | |
Pavel Emelyanov | fd54d71 | 2008-07-14 23:01:40 -0700 | [diff] [blame] | 367 | sk = inet_lookup(net, &tcp_hashinfo, iph->daddr, th->dest, |
Damian Lukowski | 4d1a2d9 | 2009-08-26 00:16:27 +0000 | [diff] [blame] | 368 | iph->saddr, th->source, inet_iif(icmp_skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | if (!sk) { |
Pavel Emelyanov | dcfc23c | 2008-07-14 23:03:00 -0700 | [diff] [blame] | 370 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | return; |
| 372 | } |
| 373 | if (sk->sk_state == TCP_TIME_WAIT) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 374 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | return; |
| 376 | } |
| 377 | |
| 378 | bh_lock_sock(sk); |
| 379 | /* If too many ICMPs get dropped on busy |
| 380 | * servers this needs to be solved differently. |
| 381 | */ |
| 382 | if (sock_owned_by_user(sk)) |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 383 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
| 385 | if (sk->sk_state == TCP_CLOSE) |
| 386 | goto out; |
| 387 | |
stephen hemminger | 97e3ecd1 | 2010-03-18 11:27:32 +0000 | [diff] [blame] | 388 | if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { |
| 389 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); |
| 390 | goto out; |
| 391 | } |
| 392 | |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 393 | icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | tp = tcp_sk(sk); |
| 395 | seq = ntohl(th->seq); |
| 396 | if (sk->sk_state != TCP_LISTEN && |
| 397 | !between(seq, tp->snd_una, tp->snd_nxt)) { |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 398 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | goto out; |
| 400 | } |
| 401 | |
| 402 | switch (type) { |
| 403 | case ICMP_SOURCE_QUENCH: |
| 404 | /* Just silently ignore these. */ |
| 405 | goto out; |
| 406 | case ICMP_PARAMETERPROB: |
| 407 | err = EPROTO; |
| 408 | break; |
| 409 | case ICMP_DEST_UNREACH: |
| 410 | if (code > NR_ICMP_UNREACH) |
| 411 | goto out; |
| 412 | |
| 413 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ |
| 414 | if (!sock_owned_by_user(sk)) |
| 415 | do_pmtu_discovery(sk, iph, info); |
| 416 | goto out; |
| 417 | } |
| 418 | |
| 419 | err = icmp_err_convert[code].errno; |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 420 | /* check if icmp_skb allows revert of backoff |
| 421 | * (see draft-zimmermann-tcp-lcd) */ |
| 422 | if (code != ICMP_NET_UNREACH && code != ICMP_HOST_UNREACH) |
| 423 | break; |
| 424 | if (seq != tp->snd_una || !icsk->icsk_retransmits || |
| 425 | !icsk->icsk_backoff) |
| 426 | break; |
| 427 | |
David S. Miller | 8f49c27 | 2010-11-12 13:35:00 -0800 | [diff] [blame] | 428 | if (sock_owned_by_user(sk)) |
| 429 | break; |
| 430 | |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 431 | icsk->icsk_backoff--; |
| 432 | inet_csk(sk)->icsk_rto = __tcp_set_rto(tp) << |
| 433 | icsk->icsk_backoff; |
| 434 | tcp_bound_rto(sk); |
| 435 | |
| 436 | skb = tcp_write_queue_head(sk); |
| 437 | BUG_ON(!skb); |
| 438 | |
| 439 | remaining = icsk->icsk_rto - min(icsk->icsk_rto, |
| 440 | tcp_time_stamp - TCP_SKB_CB(skb)->when); |
| 441 | |
| 442 | if (remaining) { |
| 443 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, |
| 444 | remaining, TCP_RTO_MAX); |
Damian Lukowski | f1ecd5d | 2009-08-26 00:16:31 +0000 | [diff] [blame] | 445 | } else { |
| 446 | /* RTO revert clocked out retransmission. |
| 447 | * Will retransmit now */ |
| 448 | tcp_retransmit_timer(sk); |
| 449 | } |
| 450 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | break; |
| 452 | case ICMP_TIME_EXCEEDED: |
| 453 | err = EHOSTUNREACH; |
| 454 | break; |
| 455 | default: |
| 456 | goto out; |
| 457 | } |
| 458 | |
| 459 | switch (sk->sk_state) { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 460 | struct request_sock *req, **prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | case TCP_LISTEN: |
| 462 | if (sock_owned_by_user(sk)) |
| 463 | goto out; |
| 464 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 465 | req = inet_csk_search_req(sk, &prev, th->dest, |
| 466 | iph->daddr, iph->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | if (!req) |
| 468 | goto out; |
| 469 | |
| 470 | /* ICMPs are not backlogged, hence we cannot get |
| 471 | an established socket here. |
| 472 | */ |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 473 | WARN_ON(req->sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 475 | if (seq != tcp_rsk(req)->snt_isn) { |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 476 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | goto out; |
| 478 | } |
| 479 | |
| 480 | /* |
| 481 | * Still in SYN_RECV, just remove it silently. |
| 482 | * There is no good way to pass the error to the newly |
| 483 | * created socket, and POSIX does not want network |
| 484 | * errors returned from accept(). |
| 485 | */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 486 | inet_csk_reqsk_queue_drop(sk, req, prev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | goto out; |
| 488 | |
| 489 | case TCP_SYN_SENT: |
| 490 | case TCP_SYN_RECV: /* Cannot happen. |
| 491 | It can f.e. if SYNs crossed. |
| 492 | */ |
| 493 | if (!sock_owned_by_user(sk)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | sk->sk_err = err; |
| 495 | |
| 496 | sk->sk_error_report(sk); |
| 497 | |
| 498 | tcp_done(sk); |
| 499 | } else { |
| 500 | sk->sk_err_soft = err; |
| 501 | } |
| 502 | goto out; |
| 503 | } |
| 504 | |
| 505 | /* If we've already connected we will keep trying |
| 506 | * until we time out, or the user gives up. |
| 507 | * |
| 508 | * rfc1122 4.2.3.9 allows to consider as hard errors |
| 509 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, |
| 510 | * but it is obsoleted by pmtu discovery). |
| 511 | * |
| 512 | * Note, that in modern internet, where routing is unreliable |
| 513 | * and in each dark corner broken firewalls sit, sending random |
| 514 | * errors ordered by their masters even this two messages finally lose |
| 515 | * their original sense (even Linux sends invalid PORT_UNREACHs) |
| 516 | * |
| 517 | * Now we are in compliance with RFCs. |
| 518 | * --ANK (980905) |
| 519 | */ |
| 520 | |
| 521 | inet = inet_sk(sk); |
| 522 | if (!sock_owned_by_user(sk) && inet->recverr) { |
| 523 | sk->sk_err = err; |
| 524 | sk->sk_error_report(sk); |
| 525 | } else { /* Only an error on timeout */ |
| 526 | sk->sk_err_soft = err; |
| 527 | } |
| 528 | |
| 529 | out: |
| 530 | bh_unlock_sock(sk); |
| 531 | sock_put(sk); |
| 532 | } |
| 533 | |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 534 | static void __tcp_v4_send_check(struct sk_buff *skb, |
| 535 | __be32 saddr, __be32 daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 537 | struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 539 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 540 | th->check = ~tcp_v4_check(skb->len, saddr, daddr, 0); |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 541 | skb->csum_start = skb_transport_header(skb) - skb->head; |
Al Viro | ff1dcad | 2006-11-20 18:07:29 -0800 | [diff] [blame] | 542 | skb->csum_offset = offsetof(struct tcphdr, check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | } else { |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 544 | th->check = tcp_v4_check(skb->len, saddr, daddr, |
Joe Perches | 07f0757 | 2008-11-19 15:44:53 -0800 | [diff] [blame] | 545 | csum_partial(th, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | th->doff << 2, |
| 547 | skb->csum)); |
| 548 | } |
| 549 | } |
| 550 | |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 551 | /* This routine computes an IPv4 TCP checksum. */ |
Herbert Xu | bb29624 | 2010-04-11 02:15:55 +0000 | [diff] [blame] | 552 | void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb) |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 553 | { |
| 554 | struct inet_sock *inet = inet_sk(sk); |
| 555 | |
| 556 | __tcp_v4_send_check(skb, inet->inet_saddr, inet->inet_daddr); |
| 557 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 558 | EXPORT_SYMBOL(tcp_v4_send_check); |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 559 | |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 560 | int tcp_v4_gso_send_check(struct sk_buff *skb) |
| 561 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 562 | const struct iphdr *iph; |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 563 | struct tcphdr *th; |
| 564 | |
| 565 | if (!pskb_may_pull(skb, sizeof(*th))) |
| 566 | return -EINVAL; |
| 567 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 568 | iph = ip_hdr(skb); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 569 | th = tcp_hdr(skb); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 570 | |
| 571 | th->check = 0; |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 572 | skb->ip_summed = CHECKSUM_PARTIAL; |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 573 | __tcp_v4_send_check(skb, iph->saddr, iph->daddr); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 574 | return 0; |
| 575 | } |
| 576 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | /* |
| 578 | * This routine will send an RST to the other tcp. |
| 579 | * |
| 580 | * Someone asks: why I NEVER use socket parameters (TOS, TTL etc.) |
| 581 | * for reset. |
| 582 | * Answer: if a packet caused RST, it is not for a socket |
| 583 | * existing in our system, if it is matched to a socket, |
| 584 | * it is just duplicate segment or bug in other side's TCP. |
| 585 | * So that we build reply only basing on parameters |
| 586 | * arrived with segment. |
| 587 | * Exception: precedence violation. We do not implement it in any case. |
| 588 | */ |
| 589 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 590 | 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] | 591 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 592 | struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 593 | struct { |
| 594 | struct tcphdr th; |
| 595 | #ifdef CONFIG_TCP_MD5SIG |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 596 | __be32 opt[(TCPOLEN_MD5SIG_ALIGNED >> 2)]; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 597 | #endif |
| 598 | } rep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | struct ip_reply_arg arg; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 600 | #ifdef CONFIG_TCP_MD5SIG |
| 601 | struct tcp_md5sig_key *key; |
| 602 | #endif |
Pavel Emelyanov | a86b1e3 | 2008-07-16 20:20:58 -0700 | [diff] [blame] | 603 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | |
| 605 | /* Never send a reset in response to a reset. */ |
| 606 | if (th->rst) |
| 607 | return; |
| 608 | |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 609 | if (skb_rtable(skb)->rt_type != RTN_LOCAL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | return; |
| 611 | |
| 612 | /* Swap the send and the receive. */ |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 613 | memset(&rep, 0, sizeof(rep)); |
| 614 | rep.th.dest = th->source; |
| 615 | rep.th.source = th->dest; |
| 616 | rep.th.doff = sizeof(struct tcphdr) / 4; |
| 617 | rep.th.rst = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
| 619 | if (th->ack) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 620 | rep.th.seq = th->ack_seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 622 | rep.th.ack = 1; |
| 623 | rep.th.ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin + |
| 624 | skb->len - (th->doff << 2)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | } |
| 626 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 627 | memset(&arg, 0, sizeof(arg)); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 628 | arg.iov[0].iov_base = (unsigned char *)&rep; |
| 629 | arg.iov[0].iov_len = sizeof(rep.th); |
| 630 | |
| 631 | #ifdef CONFIG_TCP_MD5SIG |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 632 | key = sk ? tcp_v4_md5_do_lookup(sk, ip_hdr(skb)->daddr) : NULL; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 633 | if (key) { |
| 634 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | |
| 635 | (TCPOPT_NOP << 16) | |
| 636 | (TCPOPT_MD5SIG << 8) | |
| 637 | TCPOLEN_MD5SIG); |
| 638 | /* Update length and the length the header thinks exists */ |
| 639 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; |
| 640 | rep.th.doff = arg.iov[0].iov_len / 4; |
| 641 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 642 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[1], |
Ilpo Järvinen | 78e645cb | 2008-10-09 14:37:47 -0700 | [diff] [blame] | 643 | key, ip_hdr(skb)->saddr, |
| 644 | ip_hdr(skb)->daddr, &rep.th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 645 | } |
| 646 | #endif |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 647 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
| 648 | ip_hdr(skb)->saddr, /* XXX */ |
Ilpo Järvinen | 52cd575 | 2008-10-08 11:34:06 -0700 | [diff] [blame] | 649 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 651 | arg.flags = (sk && inet_sk(sk)->transparent) ? IP_REPLY_ARG_NOSRCCHECK : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 653 | net = dev_net(skb_dst(skb)->dev); |
David S. Miller | 0a5ebb8 | 2011-05-09 13:22:43 -0700 | [diff] [blame] | 654 | ip_send_reply(net->ipv4.tcp_sock, skb, ip_hdr(skb)->saddr, |
Denis V. Lunev | 7feb49c | 2008-04-03 14:32:00 -0700 | [diff] [blame] | 655 | &arg, arg.iov[0].iov_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 657 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
| 658 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | } |
| 660 | |
| 661 | /* The code following below sending ACKs in SYN-RECV and TIME-WAIT states |
| 662 | outside socket context is ugly, certainly. What can I do? |
| 663 | */ |
| 664 | |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 665 | static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack, |
| 666 | u32 win, u32 ts, int oif, |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 667 | struct tcp_md5sig_key *key, |
| 668 | int reply_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 670 | struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | struct { |
| 672 | struct tcphdr th; |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 673 | __be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 674 | #ifdef CONFIG_TCP_MD5SIG |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 675 | + (TCPOLEN_MD5SIG_ALIGNED >> 2) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 676 | #endif |
| 677 | ]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | } rep; |
| 679 | struct ip_reply_arg arg; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 680 | struct net *net = dev_net(skb_dst(skb)->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | |
| 682 | memset(&rep.th, 0, sizeof(struct tcphdr)); |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 683 | memset(&arg, 0, sizeof(arg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
| 685 | arg.iov[0].iov_base = (unsigned char *)&rep; |
| 686 | arg.iov[0].iov_len = sizeof(rep.th); |
| 687 | if (ts) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 688 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| 689 | (TCPOPT_TIMESTAMP << 8) | |
| 690 | TCPOLEN_TIMESTAMP); |
| 691 | rep.opt[1] = htonl(tcp_time_stamp); |
| 692 | rep.opt[2] = htonl(ts); |
Craig Schlenter | cb48cfe | 2007-01-09 00:11:15 -0800 | [diff] [blame] | 693 | arg.iov[0].iov_len += TCPOLEN_TSTAMP_ALIGNED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | } |
| 695 | |
| 696 | /* Swap the send and the receive. */ |
| 697 | rep.th.dest = th->source; |
| 698 | rep.th.source = th->dest; |
| 699 | rep.th.doff = arg.iov[0].iov_len / 4; |
| 700 | rep.th.seq = htonl(seq); |
| 701 | rep.th.ack_seq = htonl(ack); |
| 702 | rep.th.ack = 1; |
| 703 | rep.th.window = htons(win); |
| 704 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 705 | #ifdef CONFIG_TCP_MD5SIG |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 706 | if (key) { |
| 707 | int offset = (ts) ? 3 : 0; |
| 708 | |
| 709 | rep.opt[offset++] = htonl((TCPOPT_NOP << 24) | |
| 710 | (TCPOPT_NOP << 16) | |
| 711 | (TCPOPT_MD5SIG << 8) | |
| 712 | TCPOLEN_MD5SIG); |
| 713 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; |
| 714 | rep.th.doff = arg.iov[0].iov_len/4; |
| 715 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 716 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[offset], |
Adam Langley | 90b7e11 | 2008-07-31 20:49:48 -0700 | [diff] [blame] | 717 | key, ip_hdr(skb)->saddr, |
| 718 | ip_hdr(skb)->daddr, &rep.th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 719 | } |
| 720 | #endif |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 721 | arg.flags = reply_flags; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 722 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
| 723 | ip_hdr(skb)->saddr, /* XXX */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
| 725 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 726 | if (oif) |
| 727 | arg.bound_dev_if = oif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | |
David S. Miller | 0a5ebb8 | 2011-05-09 13:22:43 -0700 | [diff] [blame] | 729 | ip_send_reply(net->ipv4.tcp_sock, skb, ip_hdr(skb)->saddr, |
Denis V. Lunev | 7feb49c | 2008-04-03 14:32:00 -0700 | [diff] [blame] | 730 | &arg, arg.iov[0].iov_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 732 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | } |
| 734 | |
| 735 | static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) |
| 736 | { |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 737 | struct inet_timewait_sock *tw = inet_twsk(sk); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 738 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 740 | 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] | 741 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 742 | tcptw->tw_ts_recent, |
| 743 | tw->tw_bound_dev_if, |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 744 | tcp_twsk_md5_key(tcptw), |
| 745 | tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0 |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 746 | ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 748 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | } |
| 750 | |
Gui Jianfeng | 6edafaa | 2008-08-06 23:50:04 -0700 | [diff] [blame] | 751 | 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] | 752 | struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | { |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 754 | tcp_v4_send_ack(skb, tcp_rsk(req)->snt_isn + 1, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 755 | tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 756 | req->ts_recent, |
| 757 | 0, |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 758 | tcp_v4_md5_do_lookup(sk, ip_hdr(skb)->daddr), |
| 759 | inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | } |
| 761 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | /* |
Kris Katterjohn | 9bf1d83 | 2008-02-17 22:29:19 -0800 | [diff] [blame] | 763 | * Send a SYN-ACK after having received a SYN. |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 764 | * This still operates on a request_sock only, not on a big |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | * socket. |
| 766 | */ |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 767 | static int tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst, |
| 768 | struct request_sock *req, |
| 769 | struct request_values *rvp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 771 | const struct inet_request_sock *ireq = inet_rsk(req); |
David S. Miller | 6bd023f | 2011-05-18 18:32:03 -0400 | [diff] [blame] | 772 | struct flowi4 fl4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | int err = -1; |
| 774 | struct sk_buff * skb; |
| 775 | |
| 776 | /* First, grab a route. */ |
David S. Miller | 6bd023f | 2011-05-18 18:32:03 -0400 | [diff] [blame] | 777 | if (!dst && (dst = inet_csk_route_req(sk, &fl4, req)) == NULL) |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 778 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 780 | skb = tcp_make_synack(sk, dst, req, rvp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | |
| 782 | if (skb) { |
Herbert Xu | 419f9f8 | 2010-04-11 02:15:53 +0000 | [diff] [blame] | 783 | __tcp_v4_send_check(skb, ireq->loc_addr, ireq->rmt_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 785 | err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, |
| 786 | ireq->rmt_addr, |
| 787 | ireq->opt); |
Gerrit Renker | b9df3cb | 2006-11-14 11:21:36 -0200 | [diff] [blame] | 788 | err = net_xmit_eval(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | } |
| 790 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | dst_release(dst); |
| 792 | return err; |
| 793 | } |
| 794 | |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 795 | static int tcp_v4_rtx_synack(struct sock *sk, struct request_sock *req, |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 796 | struct request_values *rvp) |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 797 | { |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 798 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); |
| 799 | return tcp_v4_send_synack(sk, NULL, req, rvp); |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 800 | } |
| 801 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | /* |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 803 | * IPv4 request_sock destructor. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | */ |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 805 | static void tcp_v4_reqsk_destructor(struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | { |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 807 | kfree(inet_rsk(req)->opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | } |
| 809 | |
Florian Westphal | 2a1d4bd | 2010-06-03 00:43:12 +0000 | [diff] [blame] | 810 | static void syn_flood_warning(const struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | { |
Florian Westphal | 2a1d4bd | 2010-06-03 00:43:12 +0000 | [diff] [blame] | 812 | const char *msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | |
Florian Westphal | 2a1d4bd | 2010-06-03 00:43:12 +0000 | [diff] [blame] | 814 | #ifdef CONFIG_SYN_COOKIES |
| 815 | if (sysctl_tcp_syncookies) |
| 816 | msg = "Sending cookies"; |
| 817 | else |
Arnaldo Carvalho de Melo | 80e40da | 2006-01-04 01:58:06 -0200 | [diff] [blame] | 818 | #endif |
Florian Westphal | 2a1d4bd | 2010-06-03 00:43:12 +0000 | [diff] [blame] | 819 | msg = "Dropping request"; |
| 820 | |
| 821 | pr_info("TCP: Possible SYN flooding on port %d. %s.\n", |
| 822 | ntohs(tcp_hdr(skb)->dest), msg); |
| 823 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | |
| 825 | /* |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 826 | * Save and compile IPv4 options into the request_sock if needed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | */ |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 828 | static struct ip_options_rcu *tcp_v4_save_options(struct sock *sk, |
| 829 | struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | { |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 831 | const struct ip_options *opt = &(IPCB(skb)->opt); |
| 832 | struct ip_options_rcu *dopt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | |
| 834 | if (opt && opt->optlen) { |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 835 | int opt_size = sizeof(*dopt) + opt->optlen; |
| 836 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | dopt = kmalloc(opt_size, GFP_ATOMIC); |
| 838 | if (dopt) { |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 839 | if (ip_options_echo(&dopt->opt, skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | kfree(dopt); |
| 841 | dopt = NULL; |
| 842 | } |
| 843 | } |
| 844 | } |
| 845 | return dopt; |
| 846 | } |
| 847 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 848 | #ifdef CONFIG_TCP_MD5SIG |
| 849 | /* |
| 850 | * RFC2385 MD5 checksumming requires a mapping of |
| 851 | * IP address->MD5 Key. |
| 852 | * We need to maintain these in the sk structure. |
| 853 | */ |
| 854 | |
| 855 | /* Find the Key structure for an address. */ |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 856 | static struct tcp_md5sig_key * |
| 857 | tcp_v4_md5_do_lookup(struct sock *sk, __be32 addr) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 858 | { |
| 859 | struct tcp_sock *tp = tcp_sk(sk); |
| 860 | int i; |
| 861 | |
| 862 | if (!tp->md5sig_info || !tp->md5sig_info->entries4) |
| 863 | return NULL; |
| 864 | for (i = 0; i < tp->md5sig_info->entries4; i++) { |
| 865 | if (tp->md5sig_info->keys4[i].addr == addr) |
David S. Miller | f8ab18d | 2007-09-28 15:18:35 -0700 | [diff] [blame] | 866 | return &tp->md5sig_info->keys4[i].base; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 867 | } |
| 868 | return NULL; |
| 869 | } |
| 870 | |
| 871 | struct tcp_md5sig_key *tcp_v4_md5_lookup(struct sock *sk, |
| 872 | struct sock *addr_sk) |
| 873 | { |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 874 | return tcp_v4_md5_do_lookup(sk, inet_sk(addr_sk)->inet_daddr); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 875 | } |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 876 | EXPORT_SYMBOL(tcp_v4_md5_lookup); |
| 877 | |
Adrian Bunk | f5b99bc | 2006-11-30 17:22:29 -0800 | [diff] [blame] | 878 | static struct tcp_md5sig_key *tcp_v4_reqsk_md5_lookup(struct sock *sk, |
| 879 | struct request_sock *req) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 880 | { |
| 881 | return tcp_v4_md5_do_lookup(sk, inet_rsk(req)->rmt_addr); |
| 882 | } |
| 883 | |
| 884 | /* This can be called on a newly created socket, from other files */ |
| 885 | int tcp_v4_md5_do_add(struct sock *sk, __be32 addr, |
| 886 | u8 *newkey, u8 newkeylen) |
| 887 | { |
| 888 | /* Add Key to the list */ |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 889 | struct tcp_md5sig_key *key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 890 | struct tcp_sock *tp = tcp_sk(sk); |
| 891 | struct tcp4_md5sig_key *keys; |
| 892 | |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 893 | key = tcp_v4_md5_do_lookup(sk, addr); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 894 | if (key) { |
| 895 | /* Pre-existing entry - just update that one. */ |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 896 | kfree(key->key); |
| 897 | key->key = newkey; |
| 898 | key->keylen = newkeylen; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 899 | } else { |
Arnaldo Carvalho de Melo | f668593 | 2006-11-17 11:06:01 -0200 | [diff] [blame] | 900 | struct tcp_md5sig_info *md5sig; |
| 901 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 902 | if (!tp->md5sig_info) { |
Arnaldo Carvalho de Melo | f668593 | 2006-11-17 11:06:01 -0200 | [diff] [blame] | 903 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), |
| 904 | GFP_ATOMIC); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 905 | if (!tp->md5sig_info) { |
| 906 | kfree(newkey); |
| 907 | return -ENOMEM; |
| 908 | } |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 909 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 910 | } |
Wu Fengguang | aa13307 | 2009-09-02 23:45:45 -0700 | [diff] [blame] | 911 | if (tcp_alloc_md5sig_pool(sk) == NULL) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 912 | kfree(newkey); |
| 913 | return -ENOMEM; |
| 914 | } |
Arnaldo Carvalho de Melo | f668593 | 2006-11-17 11:06:01 -0200 | [diff] [blame] | 915 | md5sig = tp->md5sig_info; |
| 916 | |
| 917 | if (md5sig->alloced4 == md5sig->entries4) { |
| 918 | keys = kmalloc((sizeof(*keys) * |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 919 | (md5sig->entries4 + 1)), GFP_ATOMIC); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 920 | if (!keys) { |
| 921 | kfree(newkey); |
| 922 | tcp_free_md5sig_pool(); |
| 923 | return -ENOMEM; |
| 924 | } |
| 925 | |
Arnaldo Carvalho de Melo | f668593 | 2006-11-17 11:06:01 -0200 | [diff] [blame] | 926 | if (md5sig->entries4) |
| 927 | memcpy(keys, md5sig->keys4, |
| 928 | sizeof(*keys) * md5sig->entries4); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 929 | |
| 930 | /* Free old key list, and reference new one */ |
YOSHIFUJI Hideaki | a80cc20 | 2007-11-20 17:30:06 -0800 | [diff] [blame] | 931 | kfree(md5sig->keys4); |
Arnaldo Carvalho de Melo | f668593 | 2006-11-17 11:06:01 -0200 | [diff] [blame] | 932 | md5sig->keys4 = keys; |
| 933 | md5sig->alloced4++; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 934 | } |
Arnaldo Carvalho de Melo | f668593 | 2006-11-17 11:06:01 -0200 | [diff] [blame] | 935 | md5sig->entries4++; |
David S. Miller | f8ab18d | 2007-09-28 15:18:35 -0700 | [diff] [blame] | 936 | md5sig->keys4[md5sig->entries4 - 1].addr = addr; |
| 937 | md5sig->keys4[md5sig->entries4 - 1].base.key = newkey; |
| 938 | md5sig->keys4[md5sig->entries4 - 1].base.keylen = newkeylen; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 939 | } |
| 940 | return 0; |
| 941 | } |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 942 | EXPORT_SYMBOL(tcp_v4_md5_do_add); |
| 943 | |
| 944 | static int tcp_v4_md5_add_func(struct sock *sk, struct sock *addr_sk, |
| 945 | u8 *newkey, u8 newkeylen) |
| 946 | { |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 947 | return tcp_v4_md5_do_add(sk, inet_sk(addr_sk)->inet_daddr, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 948 | newkey, newkeylen); |
| 949 | } |
| 950 | |
| 951 | int tcp_v4_md5_do_del(struct sock *sk, __be32 addr) |
| 952 | { |
| 953 | struct tcp_sock *tp = tcp_sk(sk); |
| 954 | int i; |
| 955 | |
| 956 | for (i = 0; i < tp->md5sig_info->entries4; i++) { |
| 957 | if (tp->md5sig_info->keys4[i].addr == addr) { |
| 958 | /* Free the key */ |
David S. Miller | f8ab18d | 2007-09-28 15:18:35 -0700 | [diff] [blame] | 959 | kfree(tp->md5sig_info->keys4[i].base.key); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 960 | tp->md5sig_info->entries4--; |
| 961 | |
| 962 | if (tp->md5sig_info->entries4 == 0) { |
| 963 | kfree(tp->md5sig_info->keys4); |
| 964 | tp->md5sig_info->keys4 = NULL; |
Leigh Brown | 8228a18d | 2006-12-17 17:12:30 -0800 | [diff] [blame] | 965 | tp->md5sig_info->alloced4 = 0; |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 966 | } else if (tp->md5sig_info->entries4 != i) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 967 | /* Need to do some manipulation */ |
YOSHIFUJI Hideaki | 354faf0 | 2007-11-20 17:30:31 -0800 | [diff] [blame] | 968 | memmove(&tp->md5sig_info->keys4[i], |
| 969 | &tp->md5sig_info->keys4[i+1], |
| 970 | (tp->md5sig_info->entries4 - i) * |
| 971 | sizeof(struct tcp4_md5sig_key)); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 972 | } |
| 973 | tcp_free_md5sig_pool(); |
| 974 | return 0; |
| 975 | } |
| 976 | } |
| 977 | return -ENOENT; |
| 978 | } |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 979 | EXPORT_SYMBOL(tcp_v4_md5_do_del); |
| 980 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 981 | static void tcp_v4_clear_md5_list(struct sock *sk) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 982 | { |
| 983 | struct tcp_sock *tp = tcp_sk(sk); |
| 984 | |
| 985 | /* Free each key, then the set of key keys, |
| 986 | * the crypto element, and then decrement our |
| 987 | * hold on the last resort crypto. |
| 988 | */ |
| 989 | if (tp->md5sig_info->entries4) { |
| 990 | int i; |
| 991 | for (i = 0; i < tp->md5sig_info->entries4; i++) |
David S. Miller | f8ab18d | 2007-09-28 15:18:35 -0700 | [diff] [blame] | 992 | kfree(tp->md5sig_info->keys4[i].base.key); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 993 | tp->md5sig_info->entries4 = 0; |
| 994 | tcp_free_md5sig_pool(); |
| 995 | } |
| 996 | if (tp->md5sig_info->keys4) { |
| 997 | kfree(tp->md5sig_info->keys4); |
| 998 | tp->md5sig_info->keys4 = NULL; |
| 999 | tp->md5sig_info->alloced4 = 0; |
| 1000 | } |
| 1001 | } |
| 1002 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1003 | static int tcp_v4_parse_md5_keys(struct sock *sk, char __user *optval, |
| 1004 | int optlen) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1005 | { |
| 1006 | struct tcp_md5sig cmd; |
| 1007 | struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr; |
| 1008 | u8 *newkey; |
| 1009 | |
| 1010 | if (optlen < sizeof(cmd)) |
| 1011 | return -EINVAL; |
| 1012 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1013 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1014 | return -EFAULT; |
| 1015 | |
| 1016 | if (sin->sin_family != AF_INET) |
| 1017 | return -EINVAL; |
| 1018 | |
| 1019 | if (!cmd.tcpm_key || !cmd.tcpm_keylen) { |
| 1020 | if (!tcp_sk(sk)->md5sig_info) |
| 1021 | return -ENOENT; |
| 1022 | return tcp_v4_md5_do_del(sk, sin->sin_addr.s_addr); |
| 1023 | } |
| 1024 | |
| 1025 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) |
| 1026 | return -EINVAL; |
| 1027 | |
| 1028 | if (!tcp_sk(sk)->md5sig_info) { |
| 1029 | struct tcp_sock *tp = tcp_sk(sk); |
Wu Fengguang | aa13307 | 2009-09-02 23:45:45 -0700 | [diff] [blame] | 1030 | struct tcp_md5sig_info *p; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1031 | |
Wu Fengguang | aa13307 | 2009-09-02 23:45:45 -0700 | [diff] [blame] | 1032 | p = kzalloc(sizeof(*p), sk->sk_allocation); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1033 | if (!p) |
| 1034 | return -EINVAL; |
| 1035 | |
| 1036 | tp->md5sig_info = p; |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 1037 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1038 | } |
| 1039 | |
Wu Fengguang | aa13307 | 2009-09-02 23:45:45 -0700 | [diff] [blame] | 1040 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, sk->sk_allocation); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1041 | if (!newkey) |
| 1042 | return -ENOMEM; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1043 | return tcp_v4_md5_do_add(sk, sin->sin_addr.s_addr, |
| 1044 | newkey, cmd.tcpm_keylen); |
| 1045 | } |
| 1046 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1047 | static int tcp_v4_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
| 1048 | __be32 daddr, __be32 saddr, int nbytes) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1049 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1050 | struct tcp4_pseudohdr *bp; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1051 | struct scatterlist sg; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1052 | |
| 1053 | bp = &hp->md5_blk.ip4; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1054 | |
| 1055 | /* |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1056 | * 1. the TCP pseudo-header (in the order: source IP address, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1057 | * destination IP address, zero-padded protocol number, and |
| 1058 | * segment length) |
| 1059 | */ |
| 1060 | bp->saddr = saddr; |
| 1061 | bp->daddr = daddr; |
| 1062 | bp->pad = 0; |
YOSHIFUJI Hideaki | 076fb72 | 2008-04-17 12:48:12 +0900 | [diff] [blame] | 1063 | bp->protocol = IPPROTO_TCP; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1064 | bp->len = cpu_to_be16(nbytes); |
David S. Miller | c7da57a | 2007-10-26 00:41:21 -0700 | [diff] [blame] | 1065 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1066 | sg_init_one(&sg, bp, sizeof(*bp)); |
| 1067 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); |
| 1068 | } |
| 1069 | |
| 1070 | static int tcp_v4_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
| 1071 | __be32 daddr, __be32 saddr, struct tcphdr *th) |
| 1072 | { |
| 1073 | struct tcp_md5sig_pool *hp; |
| 1074 | struct hash_desc *desc; |
| 1075 | |
| 1076 | hp = tcp_get_md5sig_pool(); |
| 1077 | if (!hp) |
| 1078 | goto clear_hash_noput; |
| 1079 | desc = &hp->md5_desc; |
| 1080 | |
| 1081 | if (crypto_hash_init(desc)) |
| 1082 | goto clear_hash; |
| 1083 | if (tcp_v4_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) |
| 1084 | goto clear_hash; |
| 1085 | if (tcp_md5_hash_header(hp, th)) |
| 1086 | goto clear_hash; |
| 1087 | if (tcp_md5_hash_key(hp, key)) |
| 1088 | goto clear_hash; |
| 1089 | if (crypto_hash_final(desc, md5_hash)) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1090 | goto clear_hash; |
| 1091 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1092 | tcp_put_md5sig_pool(); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1093 | return 0; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1094 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1095 | clear_hash: |
| 1096 | tcp_put_md5sig_pool(); |
| 1097 | clear_hash_noput: |
| 1098 | memset(md5_hash, 0, 16); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1099 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1100 | } |
| 1101 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1102 | int tcp_v4_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
| 1103 | struct sock *sk, struct request_sock *req, |
| 1104 | struct sk_buff *skb) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1105 | { |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1106 | struct tcp_md5sig_pool *hp; |
| 1107 | struct hash_desc *desc; |
| 1108 | struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1109 | __be32 saddr, daddr; |
| 1110 | |
| 1111 | if (sk) { |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1112 | saddr = inet_sk(sk)->inet_saddr; |
| 1113 | daddr = inet_sk(sk)->inet_daddr; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1114 | } else if (req) { |
| 1115 | saddr = inet_rsk(req)->loc_addr; |
| 1116 | daddr = inet_rsk(req)->rmt_addr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1117 | } else { |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1118 | const struct iphdr *iph = ip_hdr(skb); |
| 1119 | saddr = iph->saddr; |
| 1120 | daddr = iph->daddr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1121 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1122 | |
| 1123 | hp = tcp_get_md5sig_pool(); |
| 1124 | if (!hp) |
| 1125 | goto clear_hash_noput; |
| 1126 | desc = &hp->md5_desc; |
| 1127 | |
| 1128 | if (crypto_hash_init(desc)) |
| 1129 | goto clear_hash; |
| 1130 | |
| 1131 | if (tcp_v4_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) |
| 1132 | goto clear_hash; |
| 1133 | if (tcp_md5_hash_header(hp, th)) |
| 1134 | goto clear_hash; |
| 1135 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) |
| 1136 | goto clear_hash; |
| 1137 | if (tcp_md5_hash_key(hp, key)) |
| 1138 | goto clear_hash; |
| 1139 | if (crypto_hash_final(desc, md5_hash)) |
| 1140 | goto clear_hash; |
| 1141 | |
| 1142 | tcp_put_md5sig_pool(); |
| 1143 | return 0; |
| 1144 | |
| 1145 | clear_hash: |
| 1146 | tcp_put_md5sig_pool(); |
| 1147 | clear_hash_noput: |
| 1148 | memset(md5_hash, 0, 16); |
| 1149 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1150 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1151 | EXPORT_SYMBOL(tcp_v4_md5_hash_skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1152 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1153 | static int tcp_v4_inbound_md5_hash(struct sock *sk, struct sk_buff *skb) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1154 | { |
| 1155 | /* |
| 1156 | * This gets called for each TCP segment that arrives |
| 1157 | * so we want to be efficient. |
| 1158 | * We have 3 drop cases: |
| 1159 | * o No MD5 hash and one expected. |
| 1160 | * o MD5 hash and we're not expecting one. |
| 1161 | * o MD5 hash and its wrong. |
| 1162 | */ |
| 1163 | __u8 *hash_location = NULL; |
| 1164 | struct tcp_md5sig_key *hash_expected; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1165 | const struct iphdr *iph = ip_hdr(skb); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1166 | struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1167 | int genhash; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1168 | unsigned char newhash[16]; |
| 1169 | |
| 1170 | hash_expected = tcp_v4_md5_do_lookup(sk, iph->saddr); |
YOSHIFUJI Hideaki | 7d5d552 | 2008-04-17 12:29:53 +0900 | [diff] [blame] | 1171 | hash_location = tcp_parse_md5sig_option(th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1172 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1173 | /* We've parsed the options - do we have a hash? */ |
| 1174 | if (!hash_expected && !hash_location) |
| 1175 | return 0; |
| 1176 | |
| 1177 | if (hash_expected && !hash_location) { |
David S. Miller | 785957d | 2008-07-30 03:03:15 -0700 | [diff] [blame] | 1178 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1179 | return 1; |
| 1180 | } |
| 1181 | |
| 1182 | if (!hash_expected && hash_location) { |
David S. Miller | 785957d | 2008-07-30 03:03:15 -0700 | [diff] [blame] | 1183 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1184 | return 1; |
| 1185 | } |
| 1186 | |
| 1187 | /* Okay, so this is hash_expected and hash_location - |
| 1188 | * so we need to calculate the checksum. |
| 1189 | */ |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1190 | genhash = tcp_v4_md5_hash_skb(newhash, |
| 1191 | hash_expected, |
| 1192 | NULL, NULL, skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1193 | |
| 1194 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
| 1195 | if (net_ratelimit()) { |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1196 | printk(KERN_INFO "MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s\n", |
| 1197 | &iph->saddr, ntohs(th->source), |
| 1198 | &iph->daddr, ntohs(th->dest), |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1199 | genhash ? " tcp_v4_calc_md5_hash failed" : ""); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1200 | } |
| 1201 | return 1; |
| 1202 | } |
| 1203 | return 0; |
| 1204 | } |
| 1205 | |
| 1206 | #endif |
| 1207 | |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 1208 | struct request_sock_ops tcp_request_sock_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | .family = PF_INET, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1210 | .obj_size = sizeof(struct tcp_request_sock), |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 1211 | .rtx_syn_ack = tcp_v4_rtx_synack, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1212 | .send_ack = tcp_v4_reqsk_send_ack, |
| 1213 | .destructor = tcp_v4_reqsk_destructor, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | .send_reset = tcp_v4_send_reset, |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 1215 | .syn_ack_timeout = tcp_syn_ack_timeout, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | }; |
| 1217 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1218 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 1219 | static const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1220 | .md5_lookup = tcp_v4_reqsk_md5_lookup, |
John Dykstra | e3afe7b | 2009-07-16 05:04:51 +0000 | [diff] [blame] | 1221 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1222 | }; |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 1223 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) |
| 1226 | { |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1227 | struct tcp_extend_values tmp_ext; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | struct tcp_options_received tmp_opt; |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1229 | u8 *hash_location; |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1230 | struct request_sock *req; |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1231 | struct inet_request_sock *ireq; |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1232 | struct tcp_sock *tp = tcp_sk(sk); |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1233 | struct dst_entry *dst = NULL; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1234 | __be32 saddr = ip_hdr(skb)->saddr; |
| 1235 | __be32 daddr = ip_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | __u32 isn = TCP_SKB_CB(skb)->when; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | #ifdef CONFIG_SYN_COOKIES |
| 1238 | int want_cookie = 0; |
| 1239 | #else |
| 1240 | #define want_cookie 0 /* Argh, why doesn't gcc optimize this :( */ |
| 1241 | #endif |
| 1242 | |
| 1243 | /* Never answer to SYNs send to broadcast or multicast */ |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 1244 | if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | goto drop; |
| 1246 | |
| 1247 | /* TW buckets are converted to open requests without |
| 1248 | * limitations, they conserve resources and peer is |
| 1249 | * evidently real one. |
| 1250 | */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1251 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
Florian Westphal | 2a1d4bd | 2010-06-03 00:43:12 +0000 | [diff] [blame] | 1252 | if (net_ratelimit()) |
| 1253 | syn_flood_warning(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | #ifdef CONFIG_SYN_COOKIES |
| 1255 | if (sysctl_tcp_syncookies) { |
| 1256 | want_cookie = 1; |
| 1257 | } else |
| 1258 | #endif |
| 1259 | goto drop; |
| 1260 | } |
| 1261 | |
| 1262 | /* Accept backlog is full. If we have already queued enough |
| 1263 | * of warm entries in syn queue, drop request. It is better than |
| 1264 | * clogging syn queue with openreqs with exponentially increasing |
| 1265 | * timeout. |
| 1266 | */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1267 | 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] | 1268 | goto drop; |
| 1269 | |
Arnaldo Carvalho de Melo | ce4a7d0 | 2008-06-10 12:39:35 -0700 | [diff] [blame] | 1270 | req = inet_reqsk_alloc(&tcp_request_sock_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1271 | if (!req) |
| 1272 | goto drop; |
| 1273 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1274 | #ifdef CONFIG_TCP_MD5SIG |
| 1275 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv4_ops; |
| 1276 | #endif |
| 1277 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | tcp_clear_options(&tmp_opt); |
William Allen Simpson | bee7ca9 | 2009-11-10 09:51:18 +0000 | [diff] [blame] | 1279 | tmp_opt.mss_clamp = TCP_MSS_DEFAULT; |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1280 | tmp_opt.user_mss = tp->rx_opt.user_mss; |
David S. Miller | bb5b7c1 | 2009-12-15 20:56:42 -0800 | [diff] [blame] | 1281 | tcp_parse_options(skb, &tmp_opt, &hash_location, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1283 | if (tmp_opt.cookie_plus > 0 && |
| 1284 | tmp_opt.saw_tstamp && |
| 1285 | !tp->rx_opt.cookie_out_never && |
| 1286 | (sysctl_tcp_cookie_size > 0 || |
| 1287 | (tp->cookie_values != NULL && |
| 1288 | tp->cookie_values->cookie_desired > 0))) { |
| 1289 | u8 *c; |
| 1290 | u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS]; |
| 1291 | int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE; |
| 1292 | |
| 1293 | if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0) |
| 1294 | goto drop_and_release; |
| 1295 | |
| 1296 | /* Secret recipe starts with IP addresses */ |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 1297 | *mess++ ^= (__force u32)daddr; |
| 1298 | *mess++ ^= (__force u32)saddr; |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1299 | |
| 1300 | /* plus variable length Initiator Cookie */ |
| 1301 | c = (u8 *)mess; |
| 1302 | while (l-- > 0) |
| 1303 | *c++ ^= *hash_location++; |
| 1304 | |
| 1305 | #ifdef CONFIG_SYN_COOKIES |
| 1306 | want_cookie = 0; /* not our kind of cookie */ |
| 1307 | #endif |
| 1308 | tmp_ext.cookie_out_never = 0; /* false */ |
| 1309 | tmp_ext.cookie_plus = tmp_opt.cookie_plus; |
| 1310 | } else if (!tp->rx_opt.cookie_in_always) { |
| 1311 | /* redundant indications, but ensure initialization. */ |
| 1312 | tmp_ext.cookie_out_never = 1; /* true */ |
| 1313 | tmp_ext.cookie_plus = 0; |
| 1314 | } else { |
| 1315 | goto drop_and_release; |
| 1316 | } |
| 1317 | tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | |
Florian Westphal | 4dfc281 | 2008-04-10 03:12:40 -0700 | [diff] [blame] | 1319 | if (want_cookie && !tmp_opt.saw_tstamp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | tcp_clear_options(&tmp_opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | tcp_openreq_init(req, &tmp_opt, skb); |
| 1324 | |
David S. Miller | bb5b7c1 | 2009-12-15 20:56:42 -0800 | [diff] [blame] | 1325 | ireq = inet_rsk(req); |
| 1326 | ireq->loc_addr = daddr; |
| 1327 | ireq->rmt_addr = saddr; |
| 1328 | ireq->no_srccheck = inet_sk(sk)->transparent; |
| 1329 | ireq->opt = tcp_v4_save_options(sk, skb); |
| 1330 | |
Paul Moore | 284904a | 2009-03-27 17:10:28 -0400 | [diff] [blame] | 1331 | if (security_inet_conn_request(sk, skb, req)) |
David S. Miller | bb5b7c1 | 2009-12-15 20:56:42 -0800 | [diff] [blame] | 1332 | goto drop_and_free; |
Paul Moore | 284904a | 2009-03-27 17:10:28 -0400 | [diff] [blame] | 1333 | |
Florian Westphal | 172d69e | 2010-06-21 11:48:45 +0000 | [diff] [blame] | 1334 | if (!want_cookie || tmp_opt.tstamp_ok) |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1335 | TCP_ECN_create_request(req, tcp_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | |
| 1337 | if (want_cookie) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | isn = cookie_v4_init_sequence(sk, skb, &req->mss); |
Florian Westphal | 172d69e | 2010-06-21 11:48:45 +0000 | [diff] [blame] | 1339 | req->cookie_ts = tmp_opt.tstamp_ok; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | } else if (!isn) { |
| 1341 | struct inet_peer *peer = NULL; |
David S. Miller | 6bd023f | 2011-05-18 18:32:03 -0400 | [diff] [blame] | 1342 | struct flowi4 fl4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | |
| 1344 | /* VJ's idea. We save last timestamp seen |
| 1345 | * from the destination in peer table, when entering |
| 1346 | * state TIME-WAIT, and check against it before |
| 1347 | * accepting new connection request. |
| 1348 | * |
| 1349 | * If "isn" is not zero, this request hit alive |
| 1350 | * timewait bucket, so that all the necessary checks |
| 1351 | * are made in the function processing timewait state. |
| 1352 | */ |
| 1353 | if (tmp_opt.saw_tstamp && |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 1354 | tcp_death_row.sysctl_tw_recycle && |
David S. Miller | 6bd023f | 2011-05-18 18:32:03 -0400 | [diff] [blame] | 1355 | (dst = inet_csk_route_req(sk, &fl4, req)) != NULL && |
David S. Miller | ed2361e | 2011-05-18 18:38:54 -0400 | [diff] [blame] | 1356 | fl4.daddr == saddr && |
| 1357 | (peer = rt_get_peer((struct rtable *)dst, fl4.daddr)) != NULL) { |
Eric Dumazet | 317fe0e | 2010-06-16 04:52:13 +0000 | [diff] [blame] | 1358 | inet_peer_refcheck(peer); |
Eric Dumazet | 2c1409a | 2009-11-12 09:33:09 +0000 | [diff] [blame] | 1359 | if ((u32)get_seconds() - peer->tcp_ts_stamp < TCP_PAWS_MSL && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | (s32)(peer->tcp_ts - req->ts_recent) > |
| 1361 | TCP_PAWS_WINDOW) { |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 1362 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); |
Denis V. Lunev | 7cd04fa | 2008-03-03 11:59:32 -0800 | [diff] [blame] | 1363 | goto drop_and_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | } |
| 1365 | } |
| 1366 | /* Kill the following clause, if you dislike this way. */ |
| 1367 | else if (!sysctl_tcp_syncookies && |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1368 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | (sysctl_max_syn_backlog >> 2)) && |
| 1370 | (!peer || !peer->tcp_ts_stamp) && |
| 1371 | (!dst || !dst_metric(dst, RTAX_RTT))) { |
| 1372 | /* Without syncookies last quarter of |
| 1373 | * backlog is filled with destinations, |
| 1374 | * proven to be alive. |
| 1375 | * It means that we continue to communicate |
| 1376 | * to destinations, already remembered |
| 1377 | * to the moment of synflood. |
| 1378 | */ |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1379 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI4/%u\n", |
| 1380 | &saddr, ntohs(tcp_hdr(skb)->source)); |
Denis V. Lunev | 7cd04fa | 2008-03-03 11:59:32 -0800 | [diff] [blame] | 1381 | goto drop_and_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | } |
| 1383 | |
Gerrit Renker | a94f723 | 2006-11-10 14:06:49 -0800 | [diff] [blame] | 1384 | isn = tcp_v4_init_sequence(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | } |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1386 | tcp_rsk(req)->snt_isn = isn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 1388 | if (tcp_v4_send_synack(sk, dst, req, |
| 1389 | (struct request_values *)&tmp_ext) || |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1390 | want_cookie) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | goto drop_and_free; |
| 1392 | |
Denis V. Lunev | 7cd04fa | 2008-03-03 11:59:32 -0800 | [diff] [blame] | 1393 | inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | return 0; |
| 1395 | |
Denis V. Lunev | 7cd04fa | 2008-03-03 11:59:32 -0800 | [diff] [blame] | 1396 | drop_and_release: |
| 1397 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | drop_and_free: |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1399 | reqsk_free(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | drop: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | return 0; |
| 1402 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1403 | EXPORT_SYMBOL(tcp_v4_conn_request); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | |
| 1405 | |
| 1406 | /* |
| 1407 | * The three way handshake has completed - we got a valid synack - |
| 1408 | * now create the new socket. |
| 1409 | */ |
| 1410 | 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] | 1411 | struct request_sock *req, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | struct dst_entry *dst) |
| 1413 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1414 | struct inet_request_sock *ireq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | struct inet_sock *newinet; |
| 1416 | struct tcp_sock *newtp; |
| 1417 | struct sock *newsk; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1418 | #ifdef CONFIG_TCP_MD5SIG |
| 1419 | struct tcp_md5sig_key *key; |
| 1420 | #endif |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1421 | struct ip_options_rcu *inet_opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | |
| 1423 | if (sk_acceptq_is_full(sk)) |
| 1424 | goto exit_overflow; |
| 1425 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | newsk = tcp_create_openreq_child(sk, req, skb); |
| 1427 | if (!newsk) |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1428 | goto exit_nonewsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 1430 | newsk->sk_gso_type = SKB_GSO_TCPV4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | |
| 1432 | newtp = tcp_sk(newsk); |
| 1433 | newinet = inet_sk(newsk); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1434 | ireq = inet_rsk(req); |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1435 | newinet->inet_daddr = ireq->rmt_addr; |
| 1436 | newinet->inet_rcv_saddr = ireq->loc_addr; |
| 1437 | newinet->inet_saddr = ireq->loc_addr; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1438 | inet_opt = ireq->opt; |
| 1439 | rcu_assign_pointer(newinet->inet_opt, inet_opt); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1440 | ireq->opt = NULL; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1441 | newinet->mc_index = inet_iif(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1442 | newinet->mc_ttl = ip_hdr(skb)->ttl; |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1443 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1444 | if (inet_opt) |
| 1445 | inet_csk(newsk)->icsk_ext_hdr_len = inet_opt->opt.optlen; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1446 | newinet->inet_id = newtp->write_seq ^ jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1448 | if (!dst && (dst = inet_csk_route_child_sock(sk, newsk, req)) == NULL) |
| 1449 | goto put_and_exit; |
| 1450 | |
| 1451 | sk_setup_caps(newsk, dst); |
| 1452 | |
John Heffner | 5d424d5 | 2006-03-20 17:53:41 -0800 | [diff] [blame] | 1453 | tcp_mtup_init(newsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | tcp_sync_mss(newsk, dst_mtu(dst)); |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 1455 | newtp->advmss = dst_metric_advmss(dst); |
Tom Quetchenbach | f5fff5d | 2008-09-21 00:21:51 -0700 | [diff] [blame] | 1456 | if (tcp_sk(sk)->rx_opt.user_mss && |
| 1457 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) |
| 1458 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; |
| 1459 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | tcp_initialize_rcv_mss(newsk); |
| 1461 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1462 | #ifdef CONFIG_TCP_MD5SIG |
| 1463 | /* Copy over the MD5 key from the original socket */ |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1464 | key = tcp_v4_md5_do_lookup(sk, newinet->inet_daddr); |
| 1465 | if (key != NULL) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1466 | /* |
| 1467 | * We're using one, so create a matching key |
| 1468 | * on the newsk structure. If we fail to get |
| 1469 | * memory, then we end up not copying the key |
| 1470 | * across. Shucks. |
| 1471 | */ |
Arnaldo Carvalho de Melo | f668593 | 2006-11-17 11:06:01 -0200 | [diff] [blame] | 1472 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
| 1473 | if (newkey != NULL) |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1474 | tcp_v4_md5_do_add(newsk, newinet->inet_daddr, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1475 | newkey, key->keylen); |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 1476 | sk_nocaps_add(newsk, NETIF_F_GSO_MASK); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1477 | } |
| 1478 | #endif |
| 1479 | |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1480 | if (__inet_inherit_port(sk, newsk) < 0) |
| 1481 | goto put_and_exit; |
Eric Dumazet | 9327f70 | 2009-12-04 03:46:54 +0000 | [diff] [blame] | 1482 | __inet_hash_nolisten(newsk, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | |
| 1484 | return newsk; |
| 1485 | |
| 1486 | exit_overflow: |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 1487 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1488 | exit_nonewsk: |
| 1489 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | exit: |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 1491 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | return NULL; |
David S. Miller | 0e73441 | 2011-05-08 15:28:03 -0700 | [diff] [blame] | 1493 | put_and_exit: |
| 1494 | sock_put(newsk); |
| 1495 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1497 | EXPORT_SYMBOL(tcp_v4_syn_recv_sock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | |
| 1499 | static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) |
| 1500 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1501 | struct tcphdr *th = tcp_hdr(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1502 | const struct iphdr *iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | struct sock *nsk; |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1504 | struct request_sock **prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | /* Find possible connection requests. */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1506 | struct request_sock *req = inet_csk_search_req(sk, &prev, th->source, |
| 1507 | iph->saddr, iph->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | if (req) |
| 1509 | return tcp_check_req(sk, skb, req, prev); |
| 1510 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1511 | nsk = inet_lookup_established(sock_net(sk), &tcp_hashinfo, iph->saddr, |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 1512 | th->source, iph->daddr, th->dest, inet_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1513 | |
| 1514 | if (nsk) { |
| 1515 | if (nsk->sk_state != TCP_TIME_WAIT) { |
| 1516 | bh_lock_sock(nsk); |
| 1517 | return nsk; |
| 1518 | } |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1519 | inet_twsk_put(inet_twsk(nsk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | return NULL; |
| 1521 | } |
| 1522 | |
| 1523 | #ifdef CONFIG_SYN_COOKIES |
Florian Westphal | af9b473 | 2010-06-03 00:43:44 +0000 | [diff] [blame] | 1524 | if (!th->syn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | sk = cookie_v4_check(sk, skb, &(IPCB(skb)->opt)); |
| 1526 | #endif |
| 1527 | return sk; |
| 1528 | } |
| 1529 | |
Al Viro | b51655b | 2006-11-14 21:40:42 -0800 | [diff] [blame] | 1530 | static __sum16 tcp_v4_checksum_init(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1532 | const struct iphdr *iph = ip_hdr(skb); |
| 1533 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1534 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1535 | if (!tcp_v4_check(skb->len, iph->saddr, |
| 1536 | iph->daddr, skb->csum)) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1537 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | return 0; |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1539 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | } |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1541 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1542 | skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1543 | skb->len, IPPROTO_TCP, 0); |
| 1544 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1545 | if (skb->len <= 76) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1546 | return __skb_checksum_complete(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | } |
| 1548 | return 0; |
| 1549 | } |
| 1550 | |
| 1551 | |
| 1552 | /* The socket must have it's spinlock held when we get |
| 1553 | * here. |
| 1554 | * |
| 1555 | * We have a potential double-lock case here, so even when |
| 1556 | * doing backlog processing we use the BH locking scheme. |
| 1557 | * This is because we cannot sleep with the original spinlock |
| 1558 | * held. |
| 1559 | */ |
| 1560 | int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) |
| 1561 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1562 | struct sock *rsk; |
| 1563 | #ifdef CONFIG_TCP_MD5SIG |
| 1564 | /* |
| 1565 | * We really want to reject the packet as early as possible |
| 1566 | * if: |
| 1567 | * o We're expecting an MD5'd packet and this is no MD5 tcp option |
| 1568 | * o There is an MD5 option and we're not expecting one |
| 1569 | */ |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1570 | if (tcp_v4_inbound_md5_hash(sk, skb)) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1571 | goto discard; |
| 1572 | #endif |
| 1573 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
Eric Dumazet | ca55158 | 2010-06-03 09:03:58 +0000 | [diff] [blame] | 1575 | sock_rps_save_rxhash(sk, skb->rxhash); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1576 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1577 | rsk = sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | goto reset; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1579 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | return 0; |
| 1581 | } |
| 1582 | |
Arnaldo Carvalho de Melo | ab6a5bb | 2007-03-18 17:43:48 -0700 | [diff] [blame] | 1583 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | goto csum_err; |
| 1585 | |
| 1586 | if (sk->sk_state == TCP_LISTEN) { |
| 1587 | struct sock *nsk = tcp_v4_hnd_req(sk, skb); |
| 1588 | if (!nsk) |
| 1589 | goto discard; |
| 1590 | |
| 1591 | if (nsk != sk) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1592 | if (tcp_child_process(sk, nsk, skb)) { |
| 1593 | rsk = nsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1594 | goto reset; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1595 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | return 0; |
| 1597 | } |
Eric Dumazet | ca55158 | 2010-06-03 09:03:58 +0000 | [diff] [blame] | 1598 | } else |
| 1599 | sock_rps_save_rxhash(sk, skb->rxhash); |
| 1600 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1601 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1602 | rsk = sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | goto reset; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1604 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | return 0; |
| 1606 | |
| 1607 | reset: |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1608 | tcp_v4_send_reset(rsk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | discard: |
| 1610 | kfree_skb(skb); |
| 1611 | /* Be careful here. If this function gets more complicated and |
| 1612 | * gcc suffers from register pressure on the x86, sk (in %ebx) |
| 1613 | * might be destroyed here. This current version compiles correctly, |
| 1614 | * but you have been warned. |
| 1615 | */ |
| 1616 | return 0; |
| 1617 | |
| 1618 | csum_err: |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1619 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | goto discard; |
| 1621 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1622 | EXPORT_SYMBOL(tcp_v4_do_rcv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | |
| 1624 | /* |
| 1625 | * From tcp_input.c |
| 1626 | */ |
| 1627 | |
| 1628 | int tcp_v4_rcv(struct sk_buff *skb) |
| 1629 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1630 | const struct iphdr *iph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | struct tcphdr *th; |
| 1632 | struct sock *sk; |
| 1633 | int ret; |
Pavel Emelyanov | a86b1e3 | 2008-07-16 20:20:58 -0700 | [diff] [blame] | 1634 | struct net *net = dev_net(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1635 | |
| 1636 | if (skb->pkt_type != PACKET_HOST) |
| 1637 | goto discard_it; |
| 1638 | |
| 1639 | /* Count it even if it's bad */ |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1640 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | |
| 1642 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) |
| 1643 | goto discard_it; |
| 1644 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1645 | th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | |
| 1647 | if (th->doff < sizeof(struct tcphdr) / 4) |
| 1648 | goto bad_packet; |
| 1649 | if (!pskb_may_pull(skb, th->doff * 4)) |
| 1650 | goto discard_it; |
| 1651 | |
| 1652 | /* An explanation is required here, I think. |
| 1653 | * Packet length and doff are validated by header prediction, |
Stephen Hemminger | caa20d9a | 2005-11-10 17:13:47 -0800 | [diff] [blame] | 1654 | * provided case of th->doff==0 is eliminated. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | * So, we defer the checks. */ |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 1656 | if (!skb_csum_unnecessary(skb) && tcp_v4_checksum_init(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | goto bad_packet; |
| 1658 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1659 | th = tcp_hdr(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1660 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1661 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
| 1662 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + |
| 1663 | skb->len - th->doff * 4); |
| 1664 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); |
| 1665 | TCP_SKB_CB(skb)->when = 0; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1666 | TCP_SKB_CB(skb)->flags = iph->tos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | TCP_SKB_CB(skb)->sacked = 0; |
| 1668 | |
Arnaldo Carvalho de Melo | 9a1f27c | 2008-10-07 11:41:57 -0700 | [diff] [blame] | 1669 | sk = __inet_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | if (!sk) |
| 1671 | goto no_tcp_socket; |
| 1672 | |
Eric Dumazet | bb134d5 | 2010-03-09 05:55:56 +0000 | [diff] [blame] | 1673 | process: |
| 1674 | if (sk->sk_state == TCP_TIME_WAIT) |
| 1675 | goto do_time_wait; |
| 1676 | |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 1677 | if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { |
| 1678 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); |
Stephen Hemminger | d218d11 | 2010-01-11 16:28:01 -0800 | [diff] [blame] | 1679 | goto discard_and_relse; |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 1680 | } |
Stephen Hemminger | d218d11 | 2010-01-11 16:28:01 -0800 | [diff] [blame] | 1681 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 1683 | goto discard_and_relse; |
Patrick McHardy | b59c270 | 2006-01-06 23:06:10 -0800 | [diff] [blame] | 1684 | nf_reset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1685 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 1686 | if (sk_filter(sk, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | goto discard_and_relse; |
| 1688 | |
| 1689 | skb->dev = NULL; |
| 1690 | |
Ingo Molnar | c636618 | 2006-07-03 00:25:13 -0700 | [diff] [blame] | 1691 | bh_lock_sock_nested(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | ret = 0; |
| 1693 | if (!sock_owned_by_user(sk)) { |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1694 | #ifdef CONFIG_NET_DMA |
| 1695 | struct tcp_sock *tp = tcp_sk(sk); |
| 1696 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
Dan Williams | f67b459 | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 1697 | tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY); |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1698 | if (tp->ucopy.dma_chan) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | ret = tcp_v4_do_rcv(sk, skb); |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1700 | else |
| 1701 | #endif |
| 1702 | { |
| 1703 | if (!tcp_prequeue(sk, skb)) |
Shan Wei | ae8d7f8 | 2009-05-05 01:01:29 +0000 | [diff] [blame] | 1704 | ret = tcp_v4_do_rcv(sk, skb); |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1705 | } |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 1706 | } else if (unlikely(sk_add_backlog(sk, skb))) { |
Zhu Yi | 6b03a53 | 2010-03-04 18:01:41 +0000 | [diff] [blame] | 1707 | bh_unlock_sock(sk); |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 1708 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
Zhu Yi | 6b03a53 | 2010-03-04 18:01:41 +0000 | [diff] [blame] | 1709 | goto discard_and_relse; |
| 1710 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | bh_unlock_sock(sk); |
| 1712 | |
| 1713 | sock_put(sk); |
| 1714 | |
| 1715 | return ret; |
| 1716 | |
| 1717 | no_tcp_socket: |
| 1718 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 1719 | goto discard_it; |
| 1720 | |
| 1721 | if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { |
| 1722 | bad_packet: |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1723 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1725 | tcp_v4_send_reset(NULL, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1726 | } |
| 1727 | |
| 1728 | discard_it: |
| 1729 | /* Discard frame. */ |
| 1730 | kfree_skb(skb); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1731 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | |
| 1733 | discard_and_relse: |
| 1734 | sock_put(sk); |
| 1735 | goto discard_it; |
| 1736 | |
| 1737 | do_time_wait: |
| 1738 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1739 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | goto discard_it; |
| 1741 | } |
| 1742 | |
| 1743 | if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1744 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1745 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1746 | goto discard_it; |
| 1747 | } |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1748 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1749 | case TCP_TW_SYN: { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1750 | struct sock *sk2 = inet_lookup_listener(dev_net(skb->dev), |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 1751 | &tcp_hashinfo, |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1752 | iph->daddr, th->dest, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1753 | inet_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | if (sk2) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1755 | inet_twsk_deschedule(inet_twsk(sk), &tcp_death_row); |
| 1756 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | sk = sk2; |
| 1758 | goto process; |
| 1759 | } |
| 1760 | /* Fall through to ACK */ |
| 1761 | } |
| 1762 | case TCP_TW_ACK: |
| 1763 | tcp_v4_timewait_ack(sk, skb); |
| 1764 | break; |
| 1765 | case TCP_TW_RST: |
| 1766 | goto no_tcp_socket; |
| 1767 | case TCP_TW_SUCCESS:; |
| 1768 | } |
| 1769 | goto discard_it; |
| 1770 | } |
| 1771 | |
David S. Miller | 3f419d2 | 2010-11-29 13:37:14 -0800 | [diff] [blame] | 1772 | struct inet_peer *tcp_v4_get_peer(struct sock *sk, bool *release_it) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | { |
David S. Miller | 3f419d2 | 2010-11-29 13:37:14 -0800 | [diff] [blame] | 1774 | struct rtable *rt = (struct rtable *) __sk_dst_get(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1775 | struct inet_sock *inet = inet_sk(sk); |
David S. Miller | 3f419d2 | 2010-11-29 13:37:14 -0800 | [diff] [blame] | 1776 | struct inet_peer *peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | |
David S. Miller | c5216cc | 2011-05-06 22:36:30 -0700 | [diff] [blame] | 1778 | if (!rt || |
| 1779 | inet->cork.fl.u.ip4.daddr != inet->inet_daddr) { |
David S. Miller | b534ecf | 2010-11-30 11:54:19 -0800 | [diff] [blame] | 1780 | peer = inet_getpeer_v4(inet->inet_daddr, 1); |
David S. Miller | 3f419d2 | 2010-11-29 13:37:14 -0800 | [diff] [blame] | 1781 | *release_it = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | } else { |
| 1783 | if (!rt->peer) |
David S. Miller | a48eff1 | 2011-05-18 18:42:43 -0400 | [diff] [blame] | 1784 | rt_bind_peer(rt, inet->inet_daddr, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | peer = rt->peer; |
David S. Miller | 3f419d2 | 2010-11-29 13:37:14 -0800 | [diff] [blame] | 1786 | *release_it = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1787 | } |
| 1788 | |
David S. Miller | 3f419d2 | 2010-11-29 13:37:14 -0800 | [diff] [blame] | 1789 | return peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | } |
David S. Miller | 3f419d2 | 2010-11-29 13:37:14 -0800 | [diff] [blame] | 1791 | EXPORT_SYMBOL(tcp_v4_get_peer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1792 | |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1793 | void *tcp_v4_tw_get_peer(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1794 | { |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1795 | struct inet_timewait_sock *tw = inet_twsk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1796 | |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1797 | return inet_getpeer_v4(tw->tw_daddr, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1798 | } |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1799 | EXPORT_SYMBOL(tcp_v4_tw_get_peer); |
| 1800 | |
| 1801 | static struct timewait_sock_ops tcp_timewait_sock_ops = { |
| 1802 | .twsk_obj_size = sizeof(struct tcp_timewait_sock), |
| 1803 | .twsk_unique = tcp_twsk_unique, |
| 1804 | .twsk_destructor= tcp_twsk_destructor, |
| 1805 | .twsk_getpeer = tcp_v4_tw_get_peer, |
| 1806 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1807 | |
Stephen Hemminger | 3b401a8 | 2009-09-01 19:25:04 +0000 | [diff] [blame] | 1808 | const struct inet_connection_sock_af_ops ipv4_specific = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1809 | .queue_xmit = ip_queue_xmit, |
| 1810 | .send_check = tcp_v4_send_check, |
| 1811 | .rebuild_header = inet_sk_rebuild_header, |
| 1812 | .conn_request = tcp_v4_conn_request, |
| 1813 | .syn_recv_sock = tcp_v4_syn_recv_sock, |
David S. Miller | 3f419d2 | 2010-11-29 13:37:14 -0800 | [diff] [blame] | 1814 | .get_peer = tcp_v4_get_peer, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1815 | .net_header_len = sizeof(struct iphdr), |
| 1816 | .setsockopt = ip_setsockopt, |
| 1817 | .getsockopt = ip_getsockopt, |
| 1818 | .addr2sockaddr = inet_csk_addr2sockaddr, |
| 1819 | .sockaddr_len = sizeof(struct sockaddr_in), |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1820 | .bind_conflict = inet_csk_bind_conflict, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1821 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1822 | .compat_setsockopt = compat_ip_setsockopt, |
| 1823 | .compat_getsockopt = compat_ip_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1824 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | }; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1826 | EXPORT_SYMBOL(ipv4_specific); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1828 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 1829 | static const struct tcp_sock_af_ops tcp_sock_ipv4_specific = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1830 | .md5_lookup = tcp_v4_md5_lookup, |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1831 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1832 | .md5_add = tcp_v4_md5_add_func, |
| 1833 | .md5_parse = tcp_v4_parse_md5_keys, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1834 | }; |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 1835 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1836 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1837 | /* NOTE: A lot of things set to zero explicitly by call to |
| 1838 | * sk_alloc() so need not be done here. |
| 1839 | */ |
| 1840 | static int tcp_v4_init_sock(struct sock *sk) |
| 1841 | { |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1842 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | struct tcp_sock *tp = tcp_sk(sk); |
| 1844 | |
| 1845 | skb_queue_head_init(&tp->out_of_order_queue); |
| 1846 | tcp_init_xmit_timers(sk); |
| 1847 | tcp_prequeue_init(tp); |
| 1848 | |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1849 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1850 | tp->mdev = TCP_TIMEOUT_INIT; |
| 1851 | |
| 1852 | /* So many TCP implementations out there (incorrectly) count the |
| 1853 | * initial SYN frame in their delayed-ACK and congestion control |
| 1854 | * algorithms that we must have the following bandaid to talk |
| 1855 | * efficiently to them. -DaveM |
| 1856 | */ |
| 1857 | tp->snd_cwnd = 2; |
| 1858 | |
| 1859 | /* See draft-stevens-tcpca-spec-01 for discussion of the |
| 1860 | * initialization of these values. |
| 1861 | */ |
Ilpo Järvinen | 0b6a05c | 2009-09-15 01:30:10 -0700 | [diff] [blame] | 1862 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1863 | tp->snd_cwnd_clamp = ~0; |
William Allen Simpson | bee7ca9 | 2009-11-10 09:51:18 +0000 | [diff] [blame] | 1864 | tp->mss_cache = TCP_MSS_DEFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1865 | |
| 1866 | tp->reordering = sysctl_tcp_reordering; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1867 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1868 | |
| 1869 | sk->sk_state = TCP_CLOSE; |
| 1870 | |
| 1871 | sk->sk_write_space = sk_stream_write_space; |
| 1872 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); |
| 1873 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1874 | icsk->icsk_af_ops = &ipv4_specific; |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1875 | icsk->icsk_sync_mss = tcp_sync_mss; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1876 | #ifdef CONFIG_TCP_MD5SIG |
| 1877 | tp->af_specific = &tcp_sock_ipv4_specific; |
| 1878 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1879 | |
William Allen Simpson | 435cf55 | 2009-12-02 18:17:05 +0000 | [diff] [blame] | 1880 | /* TCP Cookie Transactions */ |
| 1881 | if (sysctl_tcp_cookie_size > 0) { |
| 1882 | /* Default, cookies without s_data_payload. */ |
| 1883 | tp->cookie_values = |
| 1884 | kzalloc(sizeof(*tp->cookie_values), |
| 1885 | sk->sk_allocation); |
| 1886 | if (tp->cookie_values != NULL) |
| 1887 | kref_init(&tp->cookie_values->kref); |
| 1888 | } |
| 1889 | /* Presumed zeroed, in order of appearance: |
| 1890 | * cookie_in_always, cookie_out_never, |
| 1891 | * s_data_constant, s_data_in, s_data_out |
| 1892 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1893 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
| 1894 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; |
| 1895 | |
Herbert Xu | eb4dea5 | 2008-12-29 23:04:08 -0800 | [diff] [blame] | 1896 | local_bh_disable(); |
Eric Dumazet | 1748376 | 2008-11-25 21:16:35 -0800 | [diff] [blame] | 1897 | percpu_counter_inc(&tcp_sockets_allocated); |
Herbert Xu | eb4dea5 | 2008-12-29 23:04:08 -0800 | [diff] [blame] | 1898 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1899 | |
| 1900 | return 0; |
| 1901 | } |
| 1902 | |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 1903 | void tcp_v4_destroy_sock(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | { |
| 1905 | struct tcp_sock *tp = tcp_sk(sk); |
| 1906 | |
| 1907 | tcp_clear_xmit_timers(sk); |
| 1908 | |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1909 | tcp_cleanup_congestion_control(sk); |
Stephen Hemminger | 317a76f | 2005-06-23 12:19:55 -0700 | [diff] [blame] | 1910 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1911 | /* Cleanup up the write buffer. */ |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 1912 | tcp_write_queue_purge(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | |
| 1914 | /* Cleans up our, hopefully empty, out_of_order_queue. */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1915 | __skb_queue_purge(&tp->out_of_order_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1917 | #ifdef CONFIG_TCP_MD5SIG |
| 1918 | /* Clean up the MD5 key list, if any */ |
| 1919 | if (tp->md5sig_info) { |
| 1920 | tcp_v4_clear_md5_list(sk); |
| 1921 | kfree(tp->md5sig_info); |
| 1922 | tp->md5sig_info = NULL; |
| 1923 | } |
| 1924 | #endif |
| 1925 | |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1926 | #ifdef CONFIG_NET_DMA |
| 1927 | /* Cleans up our sk_async_wait_queue */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1928 | __skb_queue_purge(&sk->sk_async_wait_queue); |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1929 | #endif |
| 1930 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1931 | /* Clean prequeue, it must be empty really */ |
| 1932 | __skb_queue_purge(&tp->ucopy.prequeue); |
| 1933 | |
| 1934 | /* Clean up a referenced TCP bind bucket. */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1935 | if (inet_csk(sk)->icsk_bind_hash) |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1936 | inet_put_port(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1937 | |
| 1938 | /* |
| 1939 | * If sendmsg cached page exists, toss it. |
| 1940 | */ |
| 1941 | if (sk->sk_sndmsg_page) { |
| 1942 | __free_page(sk->sk_sndmsg_page); |
| 1943 | sk->sk_sndmsg_page = NULL; |
| 1944 | } |
| 1945 | |
William Allen Simpson | 435cf55 | 2009-12-02 18:17:05 +0000 | [diff] [blame] | 1946 | /* TCP Cookie Transactions */ |
| 1947 | if (tp->cookie_values != NULL) { |
| 1948 | kref_put(&tp->cookie_values->kref, |
| 1949 | tcp_cookie_values_release); |
| 1950 | tp->cookie_values = NULL; |
| 1951 | } |
| 1952 | |
Eric Dumazet | 1748376 | 2008-11-25 21:16:35 -0800 | [diff] [blame] | 1953 | percpu_counter_dec(&tcp_sockets_allocated); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1954 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1955 | EXPORT_SYMBOL(tcp_v4_destroy_sock); |
| 1956 | |
| 1957 | #ifdef CONFIG_PROC_FS |
| 1958 | /* Proc filesystem TCP sock list dumping. */ |
| 1959 | |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 1960 | 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] | 1961 | { |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 1962 | return hlist_nulls_empty(head) ? NULL : |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1963 | list_entry(head->first, struct inet_timewait_sock, tw_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1964 | } |
| 1965 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1966 | 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] | 1967 | { |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 1968 | return !is_a_nulls(tw->tw_node.next) ? |
| 1969 | hlist_nulls_entry(tw->tw_node.next, typeof(*tw), tw_node) : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1970 | } |
| 1971 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1972 | /* |
| 1973 | * Get next listener socket follow cur. If cur is NULL, get first socket |
| 1974 | * starting from bucket given in st->bucket; when st->bucket is zero the |
| 1975 | * very first socket in the hash table is returned. |
| 1976 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1977 | static void *listening_get_next(struct seq_file *seq, void *cur) |
| 1978 | { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1979 | struct inet_connection_sock *icsk; |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 1980 | struct hlist_nulls_node *node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1981 | struct sock *sk = cur; |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 1982 | struct inet_listen_hashbucket *ilb; |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 1983 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 1984 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1985 | |
| 1986 | if (!sk) { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1987 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 1988 | spin_lock_bh(&ilb->lock); |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 1989 | sk = sk_nulls_head(&ilb->head); |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1990 | st->offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1991 | goto get_sk; |
| 1992 | } |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 1993 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | ++st->num; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 1995 | ++st->offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1996 | |
| 1997 | if (st->state == TCP_SEQ_STATE_OPENREQ) { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1998 | struct request_sock *req = cur; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1999 | |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 2000 | icsk = inet_csk(st->syn_wait_sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2001 | req = req->dl_next; |
| 2002 | while (1) { |
| 2003 | while (req) { |
Daniel Lezcano | bdccc4c | 2008-07-19 00:15:13 -0700 | [diff] [blame] | 2004 | if (req->rsk_ops->family == st->family) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2005 | cur = req; |
| 2006 | goto out; |
| 2007 | } |
| 2008 | req = req->dl_next; |
| 2009 | } |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 2010 | if (++st->sbucket >= icsk->icsk_accept_queue.listen_opt->nr_table_entries) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2011 | break; |
| 2012 | get_req: |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2013 | req = icsk->icsk_accept_queue.listen_opt->syn_table[st->sbucket]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | } |
Eric Dumazet | 1bde5ac | 2010-12-23 09:32:46 -0800 | [diff] [blame] | 2015 | sk = sk_nulls_next(st->syn_wait_sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2016 | st->state = TCP_SEQ_STATE_LISTENING; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2017 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2018 | } else { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2019 | icsk = inet_csk(sk); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2020 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
| 2021 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2022 | goto start_req; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2023 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
Eric Dumazet | 1bde5ac | 2010-12-23 09:32:46 -0800 | [diff] [blame] | 2024 | sk = sk_nulls_next(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2025 | } |
| 2026 | get_sk: |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 2027 | sk_nulls_for_each_from(sk, node) { |
Pavel Emelyanov | 8475ef9 | 2010-11-22 03:26:12 +0000 | [diff] [blame] | 2028 | if (!net_eq(sock_net(sk), net)) |
| 2029 | continue; |
| 2030 | if (sk->sk_family == st->family) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2031 | cur = sk; |
| 2032 | goto out; |
| 2033 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2034 | icsk = inet_csk(sk); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2035 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
| 2036 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | start_req: |
| 2038 | st->uid = sock_i_uid(sk); |
| 2039 | st->syn_wait_sk = sk; |
| 2040 | st->state = TCP_SEQ_STATE_OPENREQ; |
| 2041 | st->sbucket = 0; |
| 2042 | goto get_req; |
| 2043 | } |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2044 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2045 | } |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2046 | spin_unlock_bh(&ilb->lock); |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2047 | st->offset = 0; |
Arnaldo Carvalho de Melo | 0f7ff92 | 2005-08-09 19:59:44 -0700 | [diff] [blame] | 2048 | if (++st->bucket < INET_LHTABLE_SIZE) { |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2049 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
| 2050 | spin_lock_bh(&ilb->lock); |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 2051 | sk = sk_nulls_head(&ilb->head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2052 | goto get_sk; |
| 2053 | } |
| 2054 | cur = NULL; |
| 2055 | out: |
| 2056 | return cur; |
| 2057 | } |
| 2058 | |
| 2059 | static void *listening_get_idx(struct seq_file *seq, loff_t *pos) |
| 2060 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2061 | struct tcp_iter_state *st = seq->private; |
| 2062 | void *rc; |
| 2063 | |
| 2064 | st->bucket = 0; |
| 2065 | st->offset = 0; |
| 2066 | rc = listening_get_next(seq, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2067 | |
| 2068 | while (rc && *pos) { |
| 2069 | rc = listening_get_next(seq, rc); |
| 2070 | --*pos; |
| 2071 | } |
| 2072 | return rc; |
| 2073 | } |
| 2074 | |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2075 | static inline int empty_bucket(struct tcp_iter_state *st) |
| 2076 | { |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2077 | return hlist_nulls_empty(&tcp_hashinfo.ehash[st->bucket].chain) && |
| 2078 | hlist_nulls_empty(&tcp_hashinfo.ehash[st->bucket].twchain); |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2079 | } |
| 2080 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2081 | /* |
| 2082 | * Get first established socket starting from bucket given in st->bucket. |
| 2083 | * If st->bucket is zero, the very first socket in the hash is returned. |
| 2084 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2085 | static void *established_get_first(struct seq_file *seq) |
| 2086 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2087 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 2088 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | void *rc = NULL; |
| 2090 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2091 | st->offset = 0; |
| 2092 | for (; st->bucket <= tcp_hashinfo.ehash_mask; ++st->bucket) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2093 | struct sock *sk; |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2094 | struct hlist_nulls_node *node; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2095 | struct inet_timewait_sock *tw; |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2096 | spinlock_t *lock = inet_ehash_lockp(&tcp_hashinfo, st->bucket); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2097 | |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2098 | /* Lockless fast path for the common case of empty buckets */ |
| 2099 | if (empty_bucket(st)) |
| 2100 | continue; |
| 2101 | |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2102 | spin_lock_bh(lock); |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2103 | sk_nulls_for_each(sk, node, &tcp_hashinfo.ehash[st->bucket].chain) { |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 2104 | if (sk->sk_family != st->family || |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2105 | !net_eq(sock_net(sk), net)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | continue; |
| 2107 | } |
| 2108 | rc = sk; |
| 2109 | goto out; |
| 2110 | } |
| 2111 | st->state = TCP_SEQ_STATE_TIME_WAIT; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2112 | inet_twsk_for_each(tw, node, |
Eric Dumazet | dbca9b275 | 2007-02-08 14:16:46 -0800 | [diff] [blame] | 2113 | &tcp_hashinfo.ehash[st->bucket].twchain) { |
Pavel Emelyanov | 28518fc | 2008-03-21 15:52:00 -0700 | [diff] [blame] | 2114 | if (tw->tw_family != st->family || |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2115 | !net_eq(twsk_net(tw), net)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2116 | continue; |
| 2117 | } |
| 2118 | rc = tw; |
| 2119 | goto out; |
| 2120 | } |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2121 | spin_unlock_bh(lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2122 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
| 2123 | } |
| 2124 | out: |
| 2125 | return rc; |
| 2126 | } |
| 2127 | |
| 2128 | static void *established_get_next(struct seq_file *seq, void *cur) |
| 2129 | { |
| 2130 | struct sock *sk = cur; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2131 | struct inet_timewait_sock *tw; |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2132 | struct hlist_nulls_node *node; |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2133 | struct tcp_iter_state *st = seq->private; |
Denis V. Lunev | a4146b1 | 2008-04-13 22:11:14 -0700 | [diff] [blame] | 2134 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | |
| 2136 | ++st->num; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2137 | ++st->offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | |
| 2139 | if (st->state == TCP_SEQ_STATE_TIME_WAIT) { |
| 2140 | tw = cur; |
| 2141 | tw = tw_next(tw); |
| 2142 | get_tw: |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2143 | 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] | 2144 | tw = tw_next(tw); |
| 2145 | } |
| 2146 | if (tw) { |
| 2147 | cur = tw; |
| 2148 | goto out; |
| 2149 | } |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2150 | spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2151 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
| 2152 | |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2153 | /* Look for next non empty bucket */ |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2154 | st->offset = 0; |
Eric Dumazet | f373b53 | 2009-10-09 00:16:19 +0000 | [diff] [blame] | 2155 | while (++st->bucket <= tcp_hashinfo.ehash_mask && |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2156 | empty_bucket(st)) |
| 2157 | ; |
Eric Dumazet | f373b53 | 2009-10-09 00:16:19 +0000 | [diff] [blame] | 2158 | if (st->bucket > tcp_hashinfo.ehash_mask) |
Andi Kleen | 6eac560 | 2008-08-28 01:08:02 -0700 | [diff] [blame] | 2159 | return NULL; |
| 2160 | |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2161 | spin_lock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2162 | sk = sk_nulls_head(&tcp_hashinfo.ehash[st->bucket].chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2163 | } else |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2164 | sk = sk_nulls_next(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2165 | |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2166 | sk_nulls_for_each_from(sk, node) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2167 | if (sk->sk_family == st->family && net_eq(sock_net(sk), net)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2168 | goto found; |
| 2169 | } |
| 2170 | |
| 2171 | st->state = TCP_SEQ_STATE_TIME_WAIT; |
Eric Dumazet | dbca9b275 | 2007-02-08 14:16:46 -0800 | [diff] [blame] | 2172 | tw = tw_head(&tcp_hashinfo.ehash[st->bucket].twchain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2173 | goto get_tw; |
| 2174 | found: |
| 2175 | cur = sk; |
| 2176 | out: |
| 2177 | return cur; |
| 2178 | } |
| 2179 | |
| 2180 | static void *established_get_idx(struct seq_file *seq, loff_t pos) |
| 2181 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2182 | struct tcp_iter_state *st = seq->private; |
| 2183 | void *rc; |
| 2184 | |
| 2185 | st->bucket = 0; |
| 2186 | rc = established_get_first(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2187 | |
| 2188 | while (rc && pos) { |
| 2189 | rc = established_get_next(seq, rc); |
| 2190 | --pos; |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 2191 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2192 | return rc; |
| 2193 | } |
| 2194 | |
| 2195 | static void *tcp_get_idx(struct seq_file *seq, loff_t pos) |
| 2196 | { |
| 2197 | void *rc; |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2198 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2199 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2200 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2201 | rc = listening_get_idx(seq, &pos); |
| 2202 | |
| 2203 | if (!rc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2204 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
| 2205 | rc = established_get_idx(seq, pos); |
| 2206 | } |
| 2207 | |
| 2208 | return rc; |
| 2209 | } |
| 2210 | |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2211 | static void *tcp_seek_last_pos(struct seq_file *seq) |
| 2212 | { |
| 2213 | struct tcp_iter_state *st = seq->private; |
| 2214 | int offset = st->offset; |
| 2215 | int orig_num = st->num; |
| 2216 | void *rc = NULL; |
| 2217 | |
| 2218 | switch (st->state) { |
| 2219 | case TCP_SEQ_STATE_OPENREQ: |
| 2220 | case TCP_SEQ_STATE_LISTENING: |
| 2221 | if (st->bucket >= INET_LHTABLE_SIZE) |
| 2222 | break; |
| 2223 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2224 | rc = listening_get_next(seq, NULL); |
| 2225 | while (offset-- && rc) |
| 2226 | rc = listening_get_next(seq, rc); |
| 2227 | if (rc) |
| 2228 | break; |
| 2229 | st->bucket = 0; |
| 2230 | /* Fallthrough */ |
| 2231 | case TCP_SEQ_STATE_ESTABLISHED: |
| 2232 | case TCP_SEQ_STATE_TIME_WAIT: |
| 2233 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
| 2234 | if (st->bucket > tcp_hashinfo.ehash_mask) |
| 2235 | break; |
| 2236 | rc = established_get_first(seq); |
| 2237 | while (offset-- && rc) |
| 2238 | rc = established_get_next(seq, rc); |
| 2239 | } |
| 2240 | |
| 2241 | st->num = orig_num; |
| 2242 | |
| 2243 | return rc; |
| 2244 | } |
| 2245 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2246 | static void *tcp_seq_start(struct seq_file *seq, loff_t *pos) |
| 2247 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2248 | struct tcp_iter_state *st = seq->private; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2249 | void *rc; |
| 2250 | |
| 2251 | if (*pos && *pos == st->last_pos) { |
| 2252 | rc = tcp_seek_last_pos(seq); |
| 2253 | if (rc) |
| 2254 | goto out; |
| 2255 | } |
| 2256 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2257 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2258 | st->num = 0; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2259 | st->bucket = 0; |
| 2260 | st->offset = 0; |
| 2261 | rc = *pos ? tcp_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| 2262 | |
| 2263 | out: |
| 2264 | st->last_pos = *pos; |
| 2265 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2266 | } |
| 2267 | |
| 2268 | static void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2269 | { |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2270 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2271 | void *rc = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2272 | |
| 2273 | if (v == SEQ_START_TOKEN) { |
| 2274 | rc = tcp_get_idx(seq, 0); |
| 2275 | goto out; |
| 2276 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2277 | |
| 2278 | switch (st->state) { |
| 2279 | case TCP_SEQ_STATE_OPENREQ: |
| 2280 | case TCP_SEQ_STATE_LISTENING: |
| 2281 | rc = listening_get_next(seq, v); |
| 2282 | if (!rc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2283 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2284 | st->bucket = 0; |
| 2285 | st->offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2286 | rc = established_get_first(seq); |
| 2287 | } |
| 2288 | break; |
| 2289 | case TCP_SEQ_STATE_ESTABLISHED: |
| 2290 | case TCP_SEQ_STATE_TIME_WAIT: |
| 2291 | rc = established_get_next(seq, v); |
| 2292 | break; |
| 2293 | } |
| 2294 | out: |
| 2295 | ++*pos; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2296 | st->last_pos = *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2297 | return rc; |
| 2298 | } |
| 2299 | |
| 2300 | static void tcp_seq_stop(struct seq_file *seq, void *v) |
| 2301 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2302 | struct tcp_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2303 | |
| 2304 | switch (st->state) { |
| 2305 | case TCP_SEQ_STATE_OPENREQ: |
| 2306 | if (v) { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2307 | struct inet_connection_sock *icsk = inet_csk(st->syn_wait_sk); |
| 2308 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2309 | } |
| 2310 | case TCP_SEQ_STATE_LISTENING: |
| 2311 | if (v != SEQ_START_TOKEN) |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2312 | spin_unlock_bh(&tcp_hashinfo.listening_hash[st->bucket].lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2313 | break; |
| 2314 | case TCP_SEQ_STATE_TIME_WAIT: |
| 2315 | case TCP_SEQ_STATE_ESTABLISHED: |
| 2316 | if (v) |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 2317 | spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2318 | break; |
| 2319 | } |
| 2320 | } |
| 2321 | |
| 2322 | static int tcp_seq_open(struct inode *inode, struct file *file) |
| 2323 | { |
| 2324 | struct tcp_seq_afinfo *afinfo = PDE(inode)->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2325 | struct tcp_iter_state *s; |
Denis V. Lunev | 52d6f3f | 2008-04-13 22:12:41 -0700 | [diff] [blame] | 2326 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2327 | |
Denis V. Lunev | 52d6f3f | 2008-04-13 22:12:41 -0700 | [diff] [blame] | 2328 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
| 2329 | sizeof(struct tcp_iter_state)); |
| 2330 | if (err < 0) |
| 2331 | return err; |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 2332 | |
Denis V. Lunev | 52d6f3f | 2008-04-13 22:12:41 -0700 | [diff] [blame] | 2333 | s = ((struct seq_file *)file->private_data)->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2334 | s->family = afinfo->family; |
Tom Herbert | a8b690f | 2010-06-07 00:43:42 -0700 | [diff] [blame] | 2335 | s->last_pos = 0; |
Daniel Lezcano | f40c817 | 2008-03-21 04:13:54 -0700 | [diff] [blame] | 2336 | return 0; |
| 2337 | } |
| 2338 | |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2339 | int tcp_proc_register(struct net *net, struct tcp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2340 | { |
| 2341 | int rc = 0; |
| 2342 | struct proc_dir_entry *p; |
| 2343 | |
Denis V. Lunev | 68fcadd | 2008-04-13 22:13:30 -0700 | [diff] [blame] | 2344 | afinfo->seq_fops.open = tcp_seq_open; |
| 2345 | afinfo->seq_fops.read = seq_read; |
| 2346 | afinfo->seq_fops.llseek = seq_lseek; |
| 2347 | afinfo->seq_fops.release = seq_release_net; |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 2348 | |
Denis V. Lunev | 9427c4b | 2008-04-13 22:12:13 -0700 | [diff] [blame] | 2349 | afinfo->seq_ops.start = tcp_seq_start; |
| 2350 | afinfo->seq_ops.next = tcp_seq_next; |
| 2351 | afinfo->seq_ops.stop = tcp_seq_stop; |
| 2352 | |
Denis V. Lunev | 84841c3 | 2008-05-02 04:10:08 -0700 | [diff] [blame] | 2353 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
| 2354 | &afinfo->seq_fops, afinfo); |
| 2355 | if (!p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2356 | rc = -ENOMEM; |
| 2357 | return rc; |
| 2358 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2359 | EXPORT_SYMBOL(tcp_proc_register); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2360 | |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2361 | void tcp_proc_unregister(struct net *net, struct tcp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2362 | { |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2363 | proc_net_remove(net, afinfo->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2364 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2365 | EXPORT_SYMBOL(tcp_proc_unregister); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2366 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 2367 | static void get_openreq4(struct sock *sk, struct request_sock *req, |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2368 | struct seq_file *f, int i, int uid, int *len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2369 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2370 | const struct inet_request_sock *ireq = inet_rsk(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2371 | int ttd = req->expires - jiffies; |
| 2372 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2373 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
Dan Rosenberg | 71338aa | 2011-05-23 12:17:35 +0000 | [diff] [blame] | 2374 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %u %d %pK%n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2375 | i, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2376 | ireq->loc_addr, |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 2377 | ntohs(inet_sk(sk)->inet_sport), |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2378 | ireq->rmt_addr, |
| 2379 | ntohs(ireq->rmt_port), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2380 | TCP_SYN_RECV, |
| 2381 | 0, 0, /* could print option size, but that is af dependent. */ |
| 2382 | 1, /* timers active (only the expire timer) */ |
| 2383 | jiffies_to_clock_t(ttd), |
| 2384 | req->retrans, |
| 2385 | uid, |
| 2386 | 0, /* non standard timer */ |
| 2387 | 0, /* open_requests have no inode */ |
| 2388 | atomic_read(&sk->sk_refcnt), |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2389 | req, |
| 2390 | len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2391 | } |
| 2392 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2393 | 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] | 2394 | { |
| 2395 | int timer_active; |
| 2396 | unsigned long timer_expires; |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2397 | struct tcp_sock *tp = tcp_sk(sk); |
| 2398 | const struct inet_connection_sock *icsk = inet_csk(sk); |
| 2399 | struct inet_sock *inet = inet_sk(sk); |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 2400 | __be32 dest = inet->inet_daddr; |
| 2401 | __be32 src = inet->inet_rcv_saddr; |
| 2402 | __u16 destp = ntohs(inet->inet_dport); |
| 2403 | __u16 srcp = ntohs(inet->inet_sport); |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2404 | int rx_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2405 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2406 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2407 | timer_active = 1; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2408 | timer_expires = icsk->icsk_timeout; |
| 2409 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2410 | timer_active = 4; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2411 | timer_expires = icsk->icsk_timeout; |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2412 | } else if (timer_pending(&sk->sk_timer)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2413 | timer_active = 2; |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2414 | timer_expires = sk->sk_timer.expires; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2415 | } else { |
| 2416 | timer_active = 0; |
| 2417 | timer_expires = jiffies; |
| 2418 | } |
| 2419 | |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2420 | if (sk->sk_state == TCP_LISTEN) |
| 2421 | rx_queue = sk->sk_ack_backlog; |
| 2422 | else |
| 2423 | /* |
| 2424 | * because we dont lock socket, we might find a transient negative value |
| 2425 | */ |
| 2426 | rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); |
| 2427 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2428 | 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] | 2429 | "%08X %5d %8d %lu %d %pK %lu %lu %u %u %d%n", |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2430 | i, src, srcp, dest, destp, sk->sk_state, |
Sridhar Samudrala | 47da8ee | 2006-06-27 13:29:00 -0700 | [diff] [blame] | 2431 | tp->write_seq - tp->snd_una, |
Eric Dumazet | 49d0900 | 2009-12-03 16:06:13 -0800 | [diff] [blame] | 2432 | rx_queue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2433 | timer_active, |
| 2434 | jiffies_to_clock_t(timer_expires - jiffies), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2435 | icsk->icsk_retransmits, |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2436 | sock_i_uid(sk), |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2437 | icsk->icsk_probes_out, |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2438 | sock_i_ino(sk), |
| 2439 | atomic_read(&sk->sk_refcnt), sk, |
Stephen Hemminger | 7be8735 | 2008-06-27 20:00:19 -0700 | [diff] [blame] | 2440 | jiffies_to_clock_t(icsk->icsk_rto), |
| 2441 | jiffies_to_clock_t(icsk->icsk_ack.ato), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2442 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2443 | tp->snd_cwnd, |
Ilpo Järvinen | 0b6a05c | 2009-09-15 01:30:10 -0700 | [diff] [blame] | 2444 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh, |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2445 | len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2446 | } |
| 2447 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 2448 | static void get_timewait4_sock(struct inet_timewait_sock *tw, |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2449 | struct seq_file *f, int i, int *len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2450 | { |
Al Viro | 23f33c2 | 2006-09-27 18:43:50 -0700 | [diff] [blame] | 2451 | __be32 dest, src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2452 | __u16 destp, srcp; |
| 2453 | int ttd = tw->tw_ttd - jiffies; |
| 2454 | |
| 2455 | if (ttd < 0) |
| 2456 | ttd = 0; |
| 2457 | |
| 2458 | dest = tw->tw_daddr; |
| 2459 | src = tw->tw_rcv_saddr; |
| 2460 | destp = ntohs(tw->tw_dport); |
| 2461 | srcp = ntohs(tw->tw_sport); |
| 2462 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2463 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
Dan Rosenberg | 71338aa | 2011-05-23 12:17:35 +0000 | [diff] [blame] | 2464 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK%n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2465 | i, src, srcp, dest, destp, tw->tw_substate, 0, 0, |
| 2466 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2467 | atomic_read(&tw->tw_refcnt), tw, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2468 | } |
| 2469 | |
| 2470 | #define TMPSZ 150 |
| 2471 | |
| 2472 | static int tcp4_seq_show(struct seq_file *seq, void *v) |
| 2473 | { |
Jianjun Kong | 5799de0 | 2008-11-03 02:49:10 -0800 | [diff] [blame] | 2474 | struct tcp_iter_state *st; |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2475 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2476 | |
| 2477 | if (v == SEQ_START_TOKEN) { |
| 2478 | seq_printf(seq, "%-*s\n", TMPSZ - 1, |
| 2479 | " sl local_address rem_address st tx_queue " |
| 2480 | "rx_queue tr tm->when retrnsmt uid timeout " |
| 2481 | "inode"); |
| 2482 | goto out; |
| 2483 | } |
| 2484 | st = seq->private; |
| 2485 | |
| 2486 | switch (st->state) { |
| 2487 | case TCP_SEQ_STATE_LISTENING: |
| 2488 | case TCP_SEQ_STATE_ESTABLISHED: |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2489 | get_tcp4_sock(v, seq, st->num, &len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2490 | break; |
| 2491 | case TCP_SEQ_STATE_OPENREQ: |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2492 | 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] | 2493 | break; |
| 2494 | case TCP_SEQ_STATE_TIME_WAIT: |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2495 | get_timewait4_sock(v, seq, st->num, &len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2496 | break; |
| 2497 | } |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2498 | seq_printf(seq, "%*s\n", TMPSZ - 1 - len, ""); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2499 | out: |
| 2500 | return 0; |
| 2501 | } |
| 2502 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2503 | static struct tcp_seq_afinfo tcp4_seq_afinfo = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2504 | .name = "tcp", |
| 2505 | .family = AF_INET, |
Denis V. Lunev | 5f4472c | 2008-04-13 22:13:53 -0700 | [diff] [blame] | 2506 | .seq_fops = { |
| 2507 | .owner = THIS_MODULE, |
| 2508 | }, |
Denis V. Lunev | 9427c4b | 2008-04-13 22:12:13 -0700 | [diff] [blame] | 2509 | .seq_ops = { |
| 2510 | .show = tcp4_seq_show, |
| 2511 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2512 | }; |
| 2513 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2514 | static int __net_init tcp4_proc_init_net(struct net *net) |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2515 | { |
| 2516 | return tcp_proc_register(net, &tcp4_seq_afinfo); |
| 2517 | } |
| 2518 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2519 | static void __net_exit tcp4_proc_exit_net(struct net *net) |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2520 | { |
| 2521 | tcp_proc_unregister(net, &tcp4_seq_afinfo); |
| 2522 | } |
| 2523 | |
| 2524 | static struct pernet_operations tcp4_net_ops = { |
| 2525 | .init = tcp4_proc_init_net, |
| 2526 | .exit = tcp4_proc_exit_net, |
| 2527 | }; |
| 2528 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2529 | int __init tcp4_proc_init(void) |
| 2530 | { |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2531 | return register_pernet_subsys(&tcp4_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2532 | } |
| 2533 | |
| 2534 | void tcp4_proc_exit(void) |
| 2535 | { |
Pavel Emelyanov | 757764f | 2008-03-24 14:56:02 -0700 | [diff] [blame] | 2536 | unregister_pernet_subsys(&tcp4_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2537 | } |
| 2538 | #endif /* CONFIG_PROC_FS */ |
| 2539 | |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2540 | struct sk_buff **tcp4_gro_receive(struct sk_buff **head, struct sk_buff *skb) |
| 2541 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 2542 | const struct iphdr *iph = skb_gro_network_header(skb); |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2543 | |
| 2544 | switch (skb->ip_summed) { |
| 2545 | case CHECKSUM_COMPLETE: |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 2546 | if (!tcp_v4_check(skb_gro_len(skb), iph->saddr, iph->daddr, |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2547 | skb->csum)) { |
| 2548 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 2549 | break; |
| 2550 | } |
| 2551 | |
| 2552 | /* fall through */ |
| 2553 | case CHECKSUM_NONE: |
| 2554 | NAPI_GRO_CB(skb)->flush = 1; |
| 2555 | return NULL; |
| 2556 | } |
| 2557 | |
| 2558 | return tcp_gro_receive(head, skb); |
| 2559 | } |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2560 | |
| 2561 | int tcp4_gro_complete(struct sk_buff *skb) |
| 2562 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 2563 | const struct iphdr *iph = ip_hdr(skb); |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2564 | struct tcphdr *th = tcp_hdr(skb); |
| 2565 | |
| 2566 | th->check = ~tcp_v4_check(skb->len - skb_transport_offset(skb), |
| 2567 | iph->saddr, iph->daddr, 0); |
| 2568 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
| 2569 | |
| 2570 | return tcp_gro_complete(skb); |
| 2571 | } |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2572 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2573 | struct proto tcp_prot = { |
| 2574 | .name = "TCP", |
| 2575 | .owner = THIS_MODULE, |
| 2576 | .close = tcp_close, |
| 2577 | .connect = tcp_v4_connect, |
| 2578 | .disconnect = tcp_disconnect, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2579 | .accept = inet_csk_accept, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2580 | .ioctl = tcp_ioctl, |
| 2581 | .init = tcp_v4_init_sock, |
| 2582 | .destroy = tcp_v4_destroy_sock, |
| 2583 | .shutdown = tcp_shutdown, |
| 2584 | .setsockopt = tcp_setsockopt, |
| 2585 | .getsockopt = tcp_getsockopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2586 | .recvmsg = tcp_recvmsg, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 2587 | .sendmsg = tcp_sendmsg, |
| 2588 | .sendpage = tcp_sendpage, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2589 | .backlog_rcv = tcp_v4_do_rcv, |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 2590 | .hash = inet_hash, |
| 2591 | .unhash = inet_unhash, |
| 2592 | .get_port = inet_csk_get_port, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2593 | .enter_memory_pressure = tcp_enter_memory_pressure, |
| 2594 | .sockets_allocated = &tcp_sockets_allocated, |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 2595 | .orphan_count = &tcp_orphan_count, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2596 | .memory_allocated = &tcp_memory_allocated, |
| 2597 | .memory_pressure = &tcp_memory_pressure, |
| 2598 | .sysctl_mem = sysctl_tcp_mem, |
| 2599 | .sysctl_wmem = sysctl_tcp_wmem, |
| 2600 | .sysctl_rmem = sysctl_tcp_rmem, |
| 2601 | .max_header = MAX_TCP_HEADER, |
| 2602 | .obj_size = sizeof(struct tcp_sock), |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2603 | .slab_flags = SLAB_DESTROY_BY_RCU, |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2604 | .twsk_prot = &tcp_timewait_sock_ops, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 2605 | .rsk_prot = &tcp_request_sock_ops, |
Pavel Emelyanov | 39d8cda | 2008-03-22 16:50:58 -0700 | [diff] [blame] | 2606 | .h.hashinfo = &tcp_hashinfo, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 2607 | .no_autobind = true, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2608 | #ifdef CONFIG_COMPAT |
| 2609 | .compat_setsockopt = compat_tcp_setsockopt, |
| 2610 | .compat_getsockopt = compat_tcp_getsockopt, |
| 2611 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2612 | }; |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2613 | EXPORT_SYMBOL(tcp_prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2614 | |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2615 | |
| 2616 | static int __net_init tcp_sk_init(struct net *net) |
| 2617 | { |
| 2618 | return inet_ctl_sock_create(&net->ipv4.tcp_sock, |
| 2619 | PF_INET, SOCK_RAW, IPPROTO_TCP, net); |
| 2620 | } |
| 2621 | |
| 2622 | static void __net_exit tcp_sk_exit(struct net *net) |
| 2623 | { |
| 2624 | inet_ctl_sock_destroy(net->ipv4.tcp_sock); |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 2625 | } |
| 2626 | |
| 2627 | static void __net_exit tcp_sk_exit_batch(struct list_head *net_exit_list) |
| 2628 | { |
| 2629 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET); |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2630 | } |
| 2631 | |
| 2632 | static struct pernet_operations __net_initdata tcp_sk_ops = { |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 2633 | .init = tcp_sk_init, |
| 2634 | .exit = tcp_sk_exit, |
| 2635 | .exit_batch = tcp_sk_exit_batch, |
Denis V. Lunev | 046ee90 | 2008-04-03 14:31:33 -0700 | [diff] [blame] | 2636 | }; |
| 2637 | |
Denis V. Lunev | 9b0f976 | 2008-02-29 11:13:15 -0800 | [diff] [blame] | 2638 | void __init tcp_v4_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2639 | { |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 2640 | inet_hashinfo_init(&tcp_hashinfo); |
Eric W. Biederman | 6a1b305 | 2009-02-22 00:10:18 -0800 | [diff] [blame] | 2641 | if (register_pernet_subsys(&tcp_sk_ops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2642 | panic("Failed to create the TCP control socket.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2643 | } |