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 | * |
| 8 | * Version: $Id: tcp_ipv4.c,v 1.240 2002/02/01 22:01:04 davem Exp $ |
| 9 | * |
| 10 | * IPv4 specific functions |
| 11 | * |
| 12 | * |
| 13 | * code split from: |
| 14 | * linux/ipv4/tcp.c |
| 15 | * linux/ipv4/tcp_input.c |
| 16 | * linux/ipv4/tcp_output.c |
| 17 | * |
| 18 | * See tcp.c for author information |
| 19 | * |
| 20 | * This program is free software; you can redistribute it and/or |
| 21 | * modify it under the terms of the GNU General Public License |
| 22 | * as published by the Free Software Foundation; either version |
| 23 | * 2 of the License, or (at your option) any later version. |
| 24 | */ |
| 25 | |
| 26 | /* |
| 27 | * Changes: |
| 28 | * David S. Miller : New socket lookup architecture. |
| 29 | * This code is dedicated to John Dyson. |
| 30 | * David S. Miller : Change semantics of established hash, |
| 31 | * half is devoted to TIME_WAIT sockets |
| 32 | * and the rest go in the other half. |
| 33 | * Andi Kleen : Add support for syncookies and fixed |
| 34 | * some bugs: ip options weren't passed to |
| 35 | * the TCP layer, missed a check for an |
| 36 | * ACK bit. |
| 37 | * Andi Kleen : Implemented fast path mtu discovery. |
| 38 | * Fixed many serious bugs in the |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 39 | * request_sock handling and moved |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | * most of it into the af independent code. |
| 41 | * Added tail drop and some other bugfixes. |
Stephen Hemminger | caa20d9a | 2005-11-10 17:13:47 -0800 | [diff] [blame] | 42 | * Added new listen semantics. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | * Mike McLagan : Routing by source |
| 44 | * Juan Jose Ciarlante: ip_dynaddr bits |
| 45 | * Andi Kleen: various fixes. |
| 46 | * Vitaly E. Lavrov : Transparent proxy revived after year |
| 47 | * coma. |
| 48 | * Andi Kleen : Fix new listen. |
| 49 | * Andi Kleen : Fix accept error reporting. |
| 50 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which |
| 51 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind |
| 52 | * a single port at the same time. |
| 53 | */ |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
| 56 | #include <linux/types.h> |
| 57 | #include <linux/fcntl.h> |
| 58 | #include <linux/module.h> |
| 59 | #include <linux/random.h> |
| 60 | #include <linux/cache.h> |
| 61 | #include <linux/jhash.h> |
| 62 | #include <linux/init.h> |
| 63 | #include <linux/times.h> |
| 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
| 88 | /* Check TCP sequence numbers in ICMP packets. */ |
| 89 | #define ICMP_MIN_LENGTH 8 |
| 90 | |
| 91 | /* Socket used for sending RSTs */ |
Eric Dumazet | 4103f8c | 2007-03-27 13:58:31 -0700 | [diff] [blame] | 92 | static struct socket *tcp_socket __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 94 | void tcp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 96 | #ifdef CONFIG_TCP_MD5SIG |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 97 | static struct tcp_md5sig_key *tcp_v4_md5_do_lookup(struct sock *sk, |
| 98 | __be32 addr); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 99 | static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 100 | __be32 saddr, __be32 daddr, |
| 101 | struct tcphdr *th, int protocol, |
YOSHIFUJI Hideaki | 9cb5734 | 2008-01-12 02:16:03 -0800 | [diff] [blame] | 102 | unsigned int tcplen); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 103 | #endif |
| 104 | |
Arnaldo Carvalho de Melo | 0f7ff92 | 2005-08-09 19:59:44 -0700 | [diff] [blame] | 105 | struct inet_hashinfo __cacheline_aligned tcp_hashinfo = { |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 106 | .lhash_lock = __RW_LOCK_UNLOCKED(tcp_hashinfo.lhash_lock), |
| 107 | .lhash_users = ATOMIC_INIT(0), |
| 108 | .lhash_wait = __WAIT_QUEUE_HEAD_INITIALIZER(tcp_hashinfo.lhash_wait), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | }; |
| 110 | |
Gerrit Renker | a94f723 | 2006-11-10 14:06:49 -0800 | [diff] [blame] | 111 | static inline __u32 tcp_v4_init_sequence(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 113 | return secure_tcp_sequence_number(ip_hdr(skb)->daddr, |
| 114 | ip_hdr(skb)->saddr, |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 115 | tcp_hdr(skb)->dest, |
| 116 | tcp_hdr(skb)->source); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | } |
| 118 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 119 | int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp) |
| 120 | { |
| 121 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sktw); |
| 122 | struct tcp_sock *tp = tcp_sk(sk); |
| 123 | |
| 124 | /* With PAWS, it is safe from the viewpoint |
| 125 | of data integrity. Even without PAWS it is safe provided sequence |
| 126 | spaces do not overlap i.e. at data rates <= 80Mbit/sec. |
| 127 | |
| 128 | Actually, the idea is close to VJ's one, only timestamp cache is |
| 129 | held not per host, but per port pair and TW bucket is used as state |
| 130 | holder. |
| 131 | |
| 132 | If TW bucket has been already destroyed we fall back to VJ's scheme |
| 133 | and use initial timestamp retrieved from peer table. |
| 134 | */ |
| 135 | if (tcptw->tw_ts_recent_stamp && |
| 136 | (twp == NULL || (sysctl_tcp_tw_reuse && |
James Morris | 9d729f7 | 2007-03-04 16:12:44 -0800 | [diff] [blame] | 137 | get_seconds() - tcptw->tw_ts_recent_stamp > 1))) { |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 138 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; |
| 139 | if (tp->write_seq == 0) |
| 140 | tp->write_seq = 1; |
| 141 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; |
| 142 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; |
| 143 | sock_hold(sktw); |
| 144 | return 1; |
| 145 | } |
| 146 | |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | EXPORT_SYMBOL_GPL(tcp_twsk_unique); |
| 151 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | /* This will initiate an outgoing connection. */ |
| 153 | int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
| 154 | { |
| 155 | struct inet_sock *inet = inet_sk(sk); |
| 156 | struct tcp_sock *tp = tcp_sk(sk); |
| 157 | struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; |
| 158 | struct rtable *rt; |
Al Viro | bada8ad | 2006-09-26 21:27:15 -0700 | [diff] [blame] | 159 | __be32 daddr, nexthop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | int tmp; |
| 161 | int err; |
| 162 | |
| 163 | if (addr_len < sizeof(struct sockaddr_in)) |
| 164 | return -EINVAL; |
| 165 | |
| 166 | if (usin->sin_family != AF_INET) |
| 167 | return -EAFNOSUPPORT; |
| 168 | |
| 169 | nexthop = daddr = usin->sin_addr.s_addr; |
| 170 | if (inet->opt && inet->opt->srr) { |
| 171 | if (!daddr) |
| 172 | return -EINVAL; |
| 173 | nexthop = inet->opt->faddr; |
| 174 | } |
| 175 | |
| 176 | tmp = ip_route_connect(&rt, nexthop, inet->saddr, |
| 177 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, |
| 178 | IPPROTO_TCP, |
David S. Miller | 8eb9086 | 2007-02-08 02:09:21 -0800 | [diff] [blame] | 179 | inet->sport, usin->sin_port, sk, 1); |
Wei Dong | 584bdf8 | 2007-05-31 22:49:28 -0700 | [diff] [blame] | 180 | if (tmp < 0) { |
| 181 | if (tmp == -ENETUNREACH) |
| 182 | IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | return tmp; |
Wei Dong | 584bdf8 | 2007-05-31 22:49:28 -0700 | [diff] [blame] | 184 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
| 186 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { |
| 187 | ip_rt_put(rt); |
| 188 | return -ENETUNREACH; |
| 189 | } |
| 190 | |
| 191 | if (!inet->opt || !inet->opt->srr) |
| 192 | daddr = rt->rt_dst; |
| 193 | |
| 194 | if (!inet->saddr) |
| 195 | inet->saddr = rt->rt_src; |
| 196 | inet->rcv_saddr = inet->saddr; |
| 197 | |
| 198 | if (tp->rx_opt.ts_recent_stamp && inet->daddr != daddr) { |
| 199 | /* Reset inherited state */ |
| 200 | tp->rx_opt.ts_recent = 0; |
| 201 | tp->rx_opt.ts_recent_stamp = 0; |
| 202 | tp->write_seq = 0; |
| 203 | } |
| 204 | |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 205 | if (tcp_death_row.sysctl_tw_recycle && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | !tp->rx_opt.ts_recent_stamp && rt->rt_dst == daddr) { |
| 207 | struct inet_peer *peer = rt_get_peer(rt); |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 208 | /* |
| 209 | * VJ's idea. We save last timestamp seen from |
| 210 | * the destination in peer table, when entering state |
| 211 | * TIME-WAIT * and initialize rx_opt.ts_recent from it, |
| 212 | * when trying new connection. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | */ |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 214 | if (peer != NULL && |
James Morris | 9d729f7 | 2007-03-04 16:12:44 -0800 | [diff] [blame] | 215 | peer->tcp_ts_stamp + TCP_PAWS_MSL >= get_seconds()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp; |
| 217 | tp->rx_opt.ts_recent = peer->tcp_ts; |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | inet->dport = usin->sin_port; |
| 222 | inet->daddr = daddr; |
| 223 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 224 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | if (inet->opt) |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 226 | inet_csk(sk)->icsk_ext_hdr_len = inet->opt->optlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
| 228 | tp->rx_opt.mss_clamp = 536; |
| 229 | |
| 230 | /* Socket identity is still unknown (sport may be zero). |
| 231 | * However we set state to SYN-SENT and not releasing socket |
| 232 | * lock select source port, enter ourselves into the hash tables and |
| 233 | * complete initialization after this. |
| 234 | */ |
| 235 | tcp_set_state(sk, TCP_SYN_SENT); |
Arnaldo Carvalho de Melo | a7f5e7f | 2005-12-13 23:25:31 -0800 | [diff] [blame] | 236 | err = inet_hash_connect(&tcp_death_row, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | if (err) |
| 238 | goto failure; |
| 239 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 240 | err = ip_route_newports(&rt, IPPROTO_TCP, |
| 241 | inet->sport, inet->dport, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | if (err) |
| 243 | goto failure; |
| 244 | |
| 245 | /* OK, now commit destination to socket. */ |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 246 | sk->sk_gso_type = SKB_GSO_TCPV4; |
Arnaldo Carvalho de Melo | 6cbb0df | 2005-08-09 19:49:02 -0700 | [diff] [blame] | 247 | sk_setup_caps(sk, &rt->u.dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | |
| 249 | if (!tp->write_seq) |
| 250 | tp->write_seq = secure_tcp_sequence_number(inet->saddr, |
| 251 | inet->daddr, |
| 252 | inet->sport, |
| 253 | usin->sin_port); |
| 254 | |
| 255 | inet->id = tp->write_seq ^ jiffies; |
| 256 | |
| 257 | err = tcp_connect(sk); |
| 258 | rt = NULL; |
| 259 | if (err) |
| 260 | goto failure; |
| 261 | |
| 262 | return 0; |
| 263 | |
| 264 | failure: |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 265 | /* |
| 266 | * This unhashes the socket and releases the local port, |
| 267 | * if necessary. |
| 268 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | tcp_set_state(sk, TCP_CLOSE); |
| 270 | ip_rt_put(rt); |
| 271 | sk->sk_route_caps = 0; |
| 272 | inet->dport = 0; |
| 273 | return err; |
| 274 | } |
| 275 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | /* |
| 277 | * This routine does path mtu discovery as defined in RFC1191. |
| 278 | */ |
Stephen Hemminger | 40efc6f | 2006-01-03 16:03:49 -0800 | [diff] [blame] | 279 | static void do_pmtu_discovery(struct sock *sk, struct iphdr *iph, u32 mtu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | { |
| 281 | struct dst_entry *dst; |
| 282 | struct inet_sock *inet = inet_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | |
| 284 | /* We are not interested in TCP_LISTEN and open_requests (SYN-ACKs |
| 285 | * send out by Linux are always <576bytes so they should go through |
| 286 | * unfragmented). |
| 287 | */ |
| 288 | if (sk->sk_state == TCP_LISTEN) |
| 289 | return; |
| 290 | |
| 291 | /* We don't check in the destentry if pmtu discovery is forbidden |
| 292 | * on this route. We just assume that no packet_to_big packets |
| 293 | * are send back when pmtu discovery is not active. |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 294 | * 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] | 295 | * route, but I think that's acceptable. |
| 296 | */ |
| 297 | if ((dst = __sk_dst_check(sk, 0)) == NULL) |
| 298 | return; |
| 299 | |
| 300 | dst->ops->update_pmtu(dst, mtu); |
| 301 | |
| 302 | /* Something is about to be wrong... Remember soft error |
| 303 | * for the case, if this connection will not able to recover. |
| 304 | */ |
| 305 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) |
| 306 | sk->sk_err_soft = EMSGSIZE; |
| 307 | |
| 308 | mtu = dst_mtu(dst); |
| 309 | |
| 310 | if (inet->pmtudisc != IP_PMTUDISC_DONT && |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 311 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | tcp_sync_mss(sk, mtu); |
| 313 | |
| 314 | /* Resend the TCP packet because it's |
| 315 | * clear that the old packet has been |
| 316 | * dropped. This is the new "fast" path mtu |
| 317 | * discovery. |
| 318 | */ |
| 319 | tcp_simple_retransmit(sk); |
| 320 | } /* else let the usual retransmit timer handle it */ |
| 321 | } |
| 322 | |
| 323 | /* |
| 324 | * This routine is called by the ICMP module when it gets some |
| 325 | * sort of error condition. If err < 0 then the socket should |
| 326 | * be closed and the error returned to the user. If err > 0 |
| 327 | * it's just the icmp type << 8 | icmp code. After adjustment |
| 328 | * header points to the first 8 bytes of the tcp header. We need |
| 329 | * to find the appropriate port. |
| 330 | * |
| 331 | * The locking strategy used here is very "optimistic". When |
| 332 | * someone else accesses the socket the ICMP is just dropped |
| 333 | * and for some paths there is no check at all. |
| 334 | * A more general error queue to queue errors for later handling |
| 335 | * is probably better. |
| 336 | * |
| 337 | */ |
| 338 | |
| 339 | void tcp_v4_err(struct sk_buff *skb, u32 info) |
| 340 | { |
| 341 | struct iphdr *iph = (struct iphdr *)skb->data; |
| 342 | struct tcphdr *th = (struct tcphdr *)(skb->data + (iph->ihl << 2)); |
| 343 | struct tcp_sock *tp; |
| 344 | struct inet_sock *inet; |
Arnaldo Carvalho de Melo | 88c7664 | 2007-03-13 14:43:18 -0300 | [diff] [blame] | 345 | const int type = icmp_hdr(skb)->type; |
| 346 | const int code = icmp_hdr(skb)->code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | struct sock *sk; |
| 348 | __u32 seq; |
| 349 | int err; |
| 350 | |
| 351 | if (skb->len < (iph->ihl << 2) + 8) { |
| 352 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); |
| 353 | return; |
| 354 | } |
| 355 | |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 356 | sk = inet_lookup(skb->dev->nd_net, &tcp_hashinfo, iph->daddr, th->dest, |
| 357 | iph->saddr, th->source, inet_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | if (!sk) { |
| 359 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); |
| 360 | return; |
| 361 | } |
| 362 | if (sk->sk_state == TCP_TIME_WAIT) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 363 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | return; |
| 365 | } |
| 366 | |
| 367 | bh_lock_sock(sk); |
| 368 | /* If too many ICMPs get dropped on busy |
| 369 | * servers this needs to be solved differently. |
| 370 | */ |
| 371 | if (sock_owned_by_user(sk)) |
| 372 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); |
| 373 | |
| 374 | if (sk->sk_state == TCP_CLOSE) |
| 375 | goto out; |
| 376 | |
| 377 | tp = tcp_sk(sk); |
| 378 | seq = ntohl(th->seq); |
| 379 | if (sk->sk_state != TCP_LISTEN && |
| 380 | !between(seq, tp->snd_una, tp->snd_nxt)) { |
Eric Dumazet | 06ca719 | 2006-10-20 00:22:25 -0700 | [diff] [blame] | 381 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | goto out; |
| 383 | } |
| 384 | |
| 385 | switch (type) { |
| 386 | case ICMP_SOURCE_QUENCH: |
| 387 | /* Just silently ignore these. */ |
| 388 | goto out; |
| 389 | case ICMP_PARAMETERPROB: |
| 390 | err = EPROTO; |
| 391 | break; |
| 392 | case ICMP_DEST_UNREACH: |
| 393 | if (code > NR_ICMP_UNREACH) |
| 394 | goto out; |
| 395 | |
| 396 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ |
| 397 | if (!sock_owned_by_user(sk)) |
| 398 | do_pmtu_discovery(sk, iph, info); |
| 399 | goto out; |
| 400 | } |
| 401 | |
| 402 | err = icmp_err_convert[code].errno; |
| 403 | break; |
| 404 | case ICMP_TIME_EXCEEDED: |
| 405 | err = EHOSTUNREACH; |
| 406 | break; |
| 407 | default: |
| 408 | goto out; |
| 409 | } |
| 410 | |
| 411 | switch (sk->sk_state) { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 412 | struct request_sock *req, **prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | case TCP_LISTEN: |
| 414 | if (sock_owned_by_user(sk)) |
| 415 | goto out; |
| 416 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 417 | req = inet_csk_search_req(sk, &prev, th->dest, |
| 418 | iph->daddr, iph->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | if (!req) |
| 420 | goto out; |
| 421 | |
| 422 | /* ICMPs are not backlogged, hence we cannot get |
| 423 | an established socket here. |
| 424 | */ |
| 425 | BUG_TRAP(!req->sk); |
| 426 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 427 | if (seq != tcp_rsk(req)->snt_isn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
| 429 | goto out; |
| 430 | } |
| 431 | |
| 432 | /* |
| 433 | * Still in SYN_RECV, just remove it silently. |
| 434 | * There is no good way to pass the error to the newly |
| 435 | * created socket, and POSIX does not want network |
| 436 | * errors returned from accept(). |
| 437 | */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 438 | inet_csk_reqsk_queue_drop(sk, req, prev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | goto out; |
| 440 | |
| 441 | case TCP_SYN_SENT: |
| 442 | case TCP_SYN_RECV: /* Cannot happen. |
| 443 | It can f.e. if SYNs crossed. |
| 444 | */ |
| 445 | if (!sock_owned_by_user(sk)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | sk->sk_err = err; |
| 447 | |
| 448 | sk->sk_error_report(sk); |
| 449 | |
| 450 | tcp_done(sk); |
| 451 | } else { |
| 452 | sk->sk_err_soft = err; |
| 453 | } |
| 454 | goto out; |
| 455 | } |
| 456 | |
| 457 | /* If we've already connected we will keep trying |
| 458 | * until we time out, or the user gives up. |
| 459 | * |
| 460 | * rfc1122 4.2.3.9 allows to consider as hard errors |
| 461 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, |
| 462 | * but it is obsoleted by pmtu discovery). |
| 463 | * |
| 464 | * Note, that in modern internet, where routing is unreliable |
| 465 | * and in each dark corner broken firewalls sit, sending random |
| 466 | * errors ordered by their masters even this two messages finally lose |
| 467 | * their original sense (even Linux sends invalid PORT_UNREACHs) |
| 468 | * |
| 469 | * Now we are in compliance with RFCs. |
| 470 | * --ANK (980905) |
| 471 | */ |
| 472 | |
| 473 | inet = inet_sk(sk); |
| 474 | if (!sock_owned_by_user(sk) && inet->recverr) { |
| 475 | sk->sk_err = err; |
| 476 | sk->sk_error_report(sk); |
| 477 | } else { /* Only an error on timeout */ |
| 478 | sk->sk_err_soft = err; |
| 479 | } |
| 480 | |
| 481 | out: |
| 482 | bh_unlock_sock(sk); |
| 483 | sock_put(sk); |
| 484 | } |
| 485 | |
| 486 | /* This routine computes an IPv4 TCP checksum. */ |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 487 | void tcp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | { |
| 489 | struct inet_sock *inet = inet_sk(sk); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 490 | struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 492 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
Frederik Deweerdt | ba7808e | 2007-02-04 20:15:27 -0800 | [diff] [blame] | 493 | th->check = ~tcp_v4_check(len, inet->saddr, |
| 494 | inet->daddr, 0); |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 495 | skb->csum_start = skb_transport_header(skb) - skb->head; |
Al Viro | ff1dcad | 2006-11-20 18:07:29 -0800 | [diff] [blame] | 496 | skb->csum_offset = offsetof(struct tcphdr, check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | } else { |
Frederik Deweerdt | ba7808e | 2007-02-04 20:15:27 -0800 | [diff] [blame] | 498 | th->check = tcp_v4_check(len, inet->saddr, inet->daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | csum_partial((char *)th, |
| 500 | th->doff << 2, |
| 501 | skb->csum)); |
| 502 | } |
| 503 | } |
| 504 | |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 505 | int tcp_v4_gso_send_check(struct sk_buff *skb) |
| 506 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 507 | const struct iphdr *iph; |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 508 | struct tcphdr *th; |
| 509 | |
| 510 | if (!pskb_may_pull(skb, sizeof(*th))) |
| 511 | return -EINVAL; |
| 512 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 513 | iph = ip_hdr(skb); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 514 | th = tcp_hdr(skb); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 515 | |
| 516 | th->check = 0; |
Frederik Deweerdt | ba7808e | 2007-02-04 20:15:27 -0800 | [diff] [blame] | 517 | th->check = ~tcp_v4_check(skb->len, iph->saddr, iph->daddr, 0); |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 518 | skb->csum_start = skb_transport_header(skb) - skb->head; |
Al Viro | ff1dcad | 2006-11-20 18:07:29 -0800 | [diff] [blame] | 519 | skb->csum_offset = offsetof(struct tcphdr, check); |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 520 | skb->ip_summed = CHECKSUM_PARTIAL; |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 521 | return 0; |
| 522 | } |
| 523 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | /* |
| 525 | * This routine will send an RST to the other tcp. |
| 526 | * |
| 527 | * Someone asks: why I NEVER use socket parameters (TOS, TTL etc.) |
| 528 | * for reset. |
| 529 | * Answer: if a packet caused RST, it is not for a socket |
| 530 | * existing in our system, if it is matched to a socket, |
| 531 | * it is just duplicate segment or bug in other side's TCP. |
| 532 | * So that we build reply only basing on parameters |
| 533 | * arrived with segment. |
| 534 | * Exception: precedence violation. We do not implement it in any case. |
| 535 | */ |
| 536 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 537 | 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] | 538 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 539 | struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 540 | struct { |
| 541 | struct tcphdr th; |
| 542 | #ifdef CONFIG_TCP_MD5SIG |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 543 | __be32 opt[(TCPOLEN_MD5SIG_ALIGNED >> 2)]; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 544 | #endif |
| 545 | } rep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | struct ip_reply_arg arg; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 547 | #ifdef CONFIG_TCP_MD5SIG |
| 548 | struct tcp_md5sig_key *key; |
| 549 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
| 551 | /* Never send a reset in response to a reset. */ |
| 552 | if (th->rst) |
| 553 | return; |
| 554 | |
| 555 | if (((struct rtable *)skb->dst)->rt_type != RTN_LOCAL) |
| 556 | return; |
| 557 | |
| 558 | /* Swap the send and the receive. */ |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 559 | memset(&rep, 0, sizeof(rep)); |
| 560 | rep.th.dest = th->source; |
| 561 | rep.th.source = th->dest; |
| 562 | rep.th.doff = sizeof(struct tcphdr) / 4; |
| 563 | rep.th.rst = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | |
| 565 | if (th->ack) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 566 | rep.th.seq = th->ack_seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 568 | rep.th.ack = 1; |
| 569 | rep.th.ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin + |
| 570 | skb->len - (th->doff << 2)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | } |
| 572 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 573 | memset(&arg, 0, sizeof(arg)); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 574 | arg.iov[0].iov_base = (unsigned char *)&rep; |
| 575 | arg.iov[0].iov_len = sizeof(rep.th); |
| 576 | |
| 577 | #ifdef CONFIG_TCP_MD5SIG |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 578 | 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] | 579 | if (key) { |
| 580 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | |
| 581 | (TCPOPT_NOP << 16) | |
| 582 | (TCPOPT_MD5SIG << 8) | |
| 583 | TCPOLEN_MD5SIG); |
| 584 | /* Update length and the length the header thinks exists */ |
| 585 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; |
| 586 | rep.th.doff = arg.iov[0].iov_len / 4; |
| 587 | |
| 588 | tcp_v4_do_calc_md5_hash((__u8 *)&rep.opt[1], |
| 589 | key, |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 590 | ip_hdr(skb)->daddr, |
| 591 | ip_hdr(skb)->saddr, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 592 | &rep.th, IPPROTO_TCP, |
| 593 | arg.iov[0].iov_len); |
| 594 | } |
| 595 | #endif |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 596 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
| 597 | ip_hdr(skb)->saddr, /* XXX */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | sizeof(struct tcphdr), IPPROTO_TCP, 0); |
| 599 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; |
| 600 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 601 | ip_send_reply(tcp_socket->sk, skb, &arg, arg.iov[0].iov_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | |
| 603 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); |
| 604 | TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); |
| 605 | } |
| 606 | |
| 607 | /* The code following below sending ACKs in SYN-RECV and TIME-WAIT states |
| 608 | outside socket context is ugly, certainly. What can I do? |
| 609 | */ |
| 610 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 611 | static void tcp_v4_send_ack(struct tcp_timewait_sock *twsk, |
| 612 | struct sk_buff *skb, u32 seq, u32 ack, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | u32 win, u32 ts) |
| 614 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 615 | struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | struct { |
| 617 | struct tcphdr th; |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 618 | __be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 619 | #ifdef CONFIG_TCP_MD5SIG |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 620 | + (TCPOLEN_MD5SIG_ALIGNED >> 2) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 621 | #endif |
| 622 | ]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | } rep; |
| 624 | struct ip_reply_arg arg; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 625 | #ifdef CONFIG_TCP_MD5SIG |
| 626 | struct tcp_md5sig_key *key; |
| 627 | struct tcp_md5sig_key tw_key; |
| 628 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
| 630 | memset(&rep.th, 0, sizeof(struct tcphdr)); |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 631 | memset(&arg, 0, sizeof(arg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | |
| 633 | arg.iov[0].iov_base = (unsigned char *)&rep; |
| 634 | arg.iov[0].iov_len = sizeof(rep.th); |
| 635 | if (ts) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 636 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| 637 | (TCPOPT_TIMESTAMP << 8) | |
| 638 | TCPOLEN_TIMESTAMP); |
| 639 | rep.opt[1] = htonl(tcp_time_stamp); |
| 640 | rep.opt[2] = htonl(ts); |
Craig Schlenter | cb48cfe | 2007-01-09 00:11:15 -0800 | [diff] [blame] | 641 | arg.iov[0].iov_len += TCPOLEN_TSTAMP_ALIGNED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | } |
| 643 | |
| 644 | /* Swap the send and the receive. */ |
| 645 | rep.th.dest = th->source; |
| 646 | rep.th.source = th->dest; |
| 647 | rep.th.doff = arg.iov[0].iov_len / 4; |
| 648 | rep.th.seq = htonl(seq); |
| 649 | rep.th.ack_seq = htonl(ack); |
| 650 | rep.th.ack = 1; |
| 651 | rep.th.window = htons(win); |
| 652 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 653 | #ifdef CONFIG_TCP_MD5SIG |
| 654 | /* |
| 655 | * The SKB holds an imcoming packet, but may not have a valid ->sk |
| 656 | * pointer. This is especially the case when we're dealing with a |
| 657 | * TIME_WAIT ack, because the sk structure is long gone, and only |
| 658 | * the tcp_timewait_sock remains. So the md5 key is stashed in that |
| 659 | * structure, and we use it in preference. I believe that (twsk || |
| 660 | * skb->sk) holds true, but we program defensively. |
| 661 | */ |
| 662 | if (!twsk && skb->sk) { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 663 | key = tcp_v4_md5_do_lookup(skb->sk, ip_hdr(skb)->daddr); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 664 | } else if (twsk && twsk->tw_md5_keylen) { |
| 665 | tw_key.key = twsk->tw_md5_key; |
| 666 | tw_key.keylen = twsk->tw_md5_keylen; |
| 667 | key = &tw_key; |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 668 | } else |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 669 | key = NULL; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 670 | |
| 671 | if (key) { |
| 672 | int offset = (ts) ? 3 : 0; |
| 673 | |
| 674 | rep.opt[offset++] = htonl((TCPOPT_NOP << 24) | |
| 675 | (TCPOPT_NOP << 16) | |
| 676 | (TCPOPT_MD5SIG << 8) | |
| 677 | TCPOLEN_MD5SIG); |
| 678 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; |
| 679 | rep.th.doff = arg.iov[0].iov_len/4; |
| 680 | |
| 681 | tcp_v4_do_calc_md5_hash((__u8 *)&rep.opt[offset], |
| 682 | key, |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 683 | ip_hdr(skb)->daddr, |
| 684 | ip_hdr(skb)->saddr, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 685 | &rep.th, IPPROTO_TCP, |
| 686 | arg.iov[0].iov_len); |
| 687 | } |
| 688 | #endif |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 689 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
| 690 | ip_hdr(skb)->saddr, /* XXX */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
| 692 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; |
Patrick McHardy | f0e48db | 2007-06-04 21:32:46 -0700 | [diff] [blame] | 693 | if (twsk) |
| 694 | arg.bound_dev_if = twsk->tw_sk.tw_bound_dev_if; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
| 696 | ip_send_reply(tcp_socket->sk, skb, &arg, arg.iov[0].iov_len); |
| 697 | |
| 698 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); |
| 699 | } |
| 700 | |
| 701 | static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) |
| 702 | { |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 703 | struct inet_timewait_sock *tw = inet_twsk(sk); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 704 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 706 | tcp_v4_send_ack(tcptw, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 707 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
| 708 | tcptw->tw_ts_recent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 710 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | } |
| 712 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 713 | static void tcp_v4_reqsk_send_ack(struct sk_buff *skb, |
| 714 | struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 716 | tcp_v4_send_ack(NULL, skb, tcp_rsk(req)->snt_isn + 1, |
| 717 | tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | req->ts_recent); |
| 719 | } |
| 720 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | /* |
Kris Katterjohn | 9bf1d83 | 2008-02-17 22:29:19 -0800 | [diff] [blame] | 722 | * Send a SYN-ACK after having received a SYN. |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 723 | * This still operates on a request_sock only, not on a big |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | * socket. |
| 725 | */ |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 726 | static int tcp_v4_send_synack(struct sock *sk, struct request_sock *req, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | struct dst_entry *dst) |
| 728 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 729 | const struct inet_request_sock *ireq = inet_rsk(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | int err = -1; |
| 731 | struct sk_buff * skb; |
| 732 | |
| 733 | /* First, grab a route. */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 734 | if (!dst && (dst = inet_csk_route_req(sk, req)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | goto out; |
| 736 | |
| 737 | skb = tcp_make_synack(sk, dst, req); |
| 738 | |
| 739 | if (skb) { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 740 | struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | |
Frederik Deweerdt | ba7808e | 2007-02-04 20:15:27 -0800 | [diff] [blame] | 742 | th->check = tcp_v4_check(skb->len, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 743 | ireq->loc_addr, |
| 744 | ireq->rmt_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | csum_partial((char *)th, skb->len, |
| 746 | skb->csum)); |
| 747 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 748 | err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, |
| 749 | ireq->rmt_addr, |
| 750 | ireq->opt); |
Gerrit Renker | b9df3cb | 2006-11-14 11:21:36 -0200 | [diff] [blame] | 751 | err = net_xmit_eval(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | } |
| 753 | |
| 754 | out: |
| 755 | dst_release(dst); |
| 756 | return err; |
| 757 | } |
| 758 | |
| 759 | /* |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 760 | * IPv4 request_sock destructor. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | */ |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 762 | static void tcp_v4_reqsk_destructor(struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | { |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 764 | kfree(inet_rsk(req)->opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | } |
| 766 | |
Arnaldo Carvalho de Melo | 80e40da | 2006-01-04 01:58:06 -0200 | [diff] [blame] | 767 | #ifdef CONFIG_SYN_COOKIES |
Stephen Hemminger | 40efc6f | 2006-01-03 16:03:49 -0800 | [diff] [blame] | 768 | static void syn_flood_warning(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | { |
| 770 | static unsigned long warntime; |
| 771 | |
| 772 | if (time_after(jiffies, (warntime + HZ * 60))) { |
| 773 | warntime = jiffies; |
| 774 | printk(KERN_INFO |
| 775 | "possible SYN flooding on port %d. Sending cookies.\n", |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 776 | ntohs(tcp_hdr(skb)->dest)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | } |
| 778 | } |
Arnaldo Carvalho de Melo | 80e40da | 2006-01-04 01:58:06 -0200 | [diff] [blame] | 779 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | |
| 781 | /* |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 782 | * Save and compile IPv4 options into the request_sock if needed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | */ |
Stephen Hemminger | 40efc6f | 2006-01-03 16:03:49 -0800 | [diff] [blame] | 784 | static struct ip_options *tcp_v4_save_options(struct sock *sk, |
| 785 | struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | { |
| 787 | struct ip_options *opt = &(IPCB(skb)->opt); |
| 788 | struct ip_options *dopt = NULL; |
| 789 | |
| 790 | if (opt && opt->optlen) { |
| 791 | int opt_size = optlength(opt); |
| 792 | dopt = kmalloc(opt_size, GFP_ATOMIC); |
| 793 | if (dopt) { |
| 794 | if (ip_options_echo(dopt, skb)) { |
| 795 | kfree(dopt); |
| 796 | dopt = NULL; |
| 797 | } |
| 798 | } |
| 799 | } |
| 800 | return dopt; |
| 801 | } |
| 802 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 803 | #ifdef CONFIG_TCP_MD5SIG |
| 804 | /* |
| 805 | * RFC2385 MD5 checksumming requires a mapping of |
| 806 | * IP address->MD5 Key. |
| 807 | * We need to maintain these in the sk structure. |
| 808 | */ |
| 809 | |
| 810 | /* Find the Key structure for an address. */ |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 811 | static struct tcp_md5sig_key * |
| 812 | tcp_v4_md5_do_lookup(struct sock *sk, __be32 addr) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 813 | { |
| 814 | struct tcp_sock *tp = tcp_sk(sk); |
| 815 | int i; |
| 816 | |
| 817 | if (!tp->md5sig_info || !tp->md5sig_info->entries4) |
| 818 | return NULL; |
| 819 | for (i = 0; i < tp->md5sig_info->entries4; i++) { |
| 820 | if (tp->md5sig_info->keys4[i].addr == addr) |
David S. Miller | f8ab18d | 2007-09-28 15:18:35 -0700 | [diff] [blame] | 821 | return &tp->md5sig_info->keys4[i].base; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 822 | } |
| 823 | return NULL; |
| 824 | } |
| 825 | |
| 826 | struct tcp_md5sig_key *tcp_v4_md5_lookup(struct sock *sk, |
| 827 | struct sock *addr_sk) |
| 828 | { |
| 829 | return tcp_v4_md5_do_lookup(sk, inet_sk(addr_sk)->daddr); |
| 830 | } |
| 831 | |
| 832 | EXPORT_SYMBOL(tcp_v4_md5_lookup); |
| 833 | |
Adrian Bunk | f5b99bc | 2006-11-30 17:22:29 -0800 | [diff] [blame] | 834 | static struct tcp_md5sig_key *tcp_v4_reqsk_md5_lookup(struct sock *sk, |
| 835 | struct request_sock *req) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 836 | { |
| 837 | return tcp_v4_md5_do_lookup(sk, inet_rsk(req)->rmt_addr); |
| 838 | } |
| 839 | |
| 840 | /* This can be called on a newly created socket, from other files */ |
| 841 | int tcp_v4_md5_do_add(struct sock *sk, __be32 addr, |
| 842 | u8 *newkey, u8 newkeylen) |
| 843 | { |
| 844 | /* Add Key to the list */ |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 845 | struct tcp_md5sig_key *key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 846 | struct tcp_sock *tp = tcp_sk(sk); |
| 847 | struct tcp4_md5sig_key *keys; |
| 848 | |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 849 | key = tcp_v4_md5_do_lookup(sk, addr); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 850 | if (key) { |
| 851 | /* Pre-existing entry - just update that one. */ |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 852 | kfree(key->key); |
| 853 | key->key = newkey; |
| 854 | key->keylen = newkeylen; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 855 | } else { |
Arnaldo Carvalho de Melo | f668593 | 2006-11-17 11:06:01 -0200 | [diff] [blame] | 856 | struct tcp_md5sig_info *md5sig; |
| 857 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 858 | if (!tp->md5sig_info) { |
Arnaldo Carvalho de Melo | f668593 | 2006-11-17 11:06:01 -0200 | [diff] [blame] | 859 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), |
| 860 | GFP_ATOMIC); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 861 | if (!tp->md5sig_info) { |
| 862 | kfree(newkey); |
| 863 | return -ENOMEM; |
| 864 | } |
David S. Miller | 3d7dbea | 2007-06-12 14:36:42 -0700 | [diff] [blame] | 865 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 866 | } |
| 867 | if (tcp_alloc_md5sig_pool() == NULL) { |
| 868 | kfree(newkey); |
| 869 | return -ENOMEM; |
| 870 | } |
Arnaldo Carvalho de Melo | f668593 | 2006-11-17 11:06:01 -0200 | [diff] [blame] | 871 | md5sig = tp->md5sig_info; |
| 872 | |
| 873 | if (md5sig->alloced4 == md5sig->entries4) { |
| 874 | keys = kmalloc((sizeof(*keys) * |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 875 | (md5sig->entries4 + 1)), GFP_ATOMIC); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 876 | if (!keys) { |
| 877 | kfree(newkey); |
| 878 | tcp_free_md5sig_pool(); |
| 879 | return -ENOMEM; |
| 880 | } |
| 881 | |
Arnaldo Carvalho de Melo | f668593 | 2006-11-17 11:06:01 -0200 | [diff] [blame] | 882 | if (md5sig->entries4) |
| 883 | memcpy(keys, md5sig->keys4, |
| 884 | sizeof(*keys) * md5sig->entries4); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 885 | |
| 886 | /* Free old key list, and reference new one */ |
YOSHIFUJI Hideaki | a80cc20 | 2007-11-20 17:30:06 -0800 | [diff] [blame] | 887 | kfree(md5sig->keys4); |
Arnaldo Carvalho de Melo | f668593 | 2006-11-17 11:06:01 -0200 | [diff] [blame] | 888 | md5sig->keys4 = keys; |
| 889 | md5sig->alloced4++; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 890 | } |
Arnaldo Carvalho de Melo | f668593 | 2006-11-17 11:06:01 -0200 | [diff] [blame] | 891 | md5sig->entries4++; |
David S. Miller | f8ab18d | 2007-09-28 15:18:35 -0700 | [diff] [blame] | 892 | md5sig->keys4[md5sig->entries4 - 1].addr = addr; |
| 893 | md5sig->keys4[md5sig->entries4 - 1].base.key = newkey; |
| 894 | md5sig->keys4[md5sig->entries4 - 1].base.keylen = newkeylen; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 895 | } |
| 896 | return 0; |
| 897 | } |
| 898 | |
| 899 | EXPORT_SYMBOL(tcp_v4_md5_do_add); |
| 900 | |
| 901 | static int tcp_v4_md5_add_func(struct sock *sk, struct sock *addr_sk, |
| 902 | u8 *newkey, u8 newkeylen) |
| 903 | { |
| 904 | return tcp_v4_md5_do_add(sk, inet_sk(addr_sk)->daddr, |
| 905 | newkey, newkeylen); |
| 906 | } |
| 907 | |
| 908 | int tcp_v4_md5_do_del(struct sock *sk, __be32 addr) |
| 909 | { |
| 910 | struct tcp_sock *tp = tcp_sk(sk); |
| 911 | int i; |
| 912 | |
| 913 | for (i = 0; i < tp->md5sig_info->entries4; i++) { |
| 914 | if (tp->md5sig_info->keys4[i].addr == addr) { |
| 915 | /* Free the key */ |
David S. Miller | f8ab18d | 2007-09-28 15:18:35 -0700 | [diff] [blame] | 916 | kfree(tp->md5sig_info->keys4[i].base.key); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 917 | tp->md5sig_info->entries4--; |
| 918 | |
| 919 | if (tp->md5sig_info->entries4 == 0) { |
| 920 | kfree(tp->md5sig_info->keys4); |
| 921 | tp->md5sig_info->keys4 = NULL; |
Leigh Brown | 8228a18d | 2006-12-17 17:12:30 -0800 | [diff] [blame] | 922 | tp->md5sig_info->alloced4 = 0; |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 923 | } else if (tp->md5sig_info->entries4 != i) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 924 | /* Need to do some manipulation */ |
YOSHIFUJI Hideaki | 354faf0 | 2007-11-20 17:30:31 -0800 | [diff] [blame] | 925 | memmove(&tp->md5sig_info->keys4[i], |
| 926 | &tp->md5sig_info->keys4[i+1], |
| 927 | (tp->md5sig_info->entries4 - i) * |
| 928 | sizeof(struct tcp4_md5sig_key)); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 929 | } |
| 930 | tcp_free_md5sig_pool(); |
| 931 | return 0; |
| 932 | } |
| 933 | } |
| 934 | return -ENOENT; |
| 935 | } |
| 936 | |
| 937 | EXPORT_SYMBOL(tcp_v4_md5_do_del); |
| 938 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 939 | static void tcp_v4_clear_md5_list(struct sock *sk) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 940 | { |
| 941 | struct tcp_sock *tp = tcp_sk(sk); |
| 942 | |
| 943 | /* Free each key, then the set of key keys, |
| 944 | * the crypto element, and then decrement our |
| 945 | * hold on the last resort crypto. |
| 946 | */ |
| 947 | if (tp->md5sig_info->entries4) { |
| 948 | int i; |
| 949 | for (i = 0; i < tp->md5sig_info->entries4; i++) |
David S. Miller | f8ab18d | 2007-09-28 15:18:35 -0700 | [diff] [blame] | 950 | kfree(tp->md5sig_info->keys4[i].base.key); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 951 | tp->md5sig_info->entries4 = 0; |
| 952 | tcp_free_md5sig_pool(); |
| 953 | } |
| 954 | if (tp->md5sig_info->keys4) { |
| 955 | kfree(tp->md5sig_info->keys4); |
| 956 | tp->md5sig_info->keys4 = NULL; |
| 957 | tp->md5sig_info->alloced4 = 0; |
| 958 | } |
| 959 | } |
| 960 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 961 | static int tcp_v4_parse_md5_keys(struct sock *sk, char __user *optval, |
| 962 | int optlen) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 963 | { |
| 964 | struct tcp_md5sig cmd; |
| 965 | struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr; |
| 966 | u8 *newkey; |
| 967 | |
| 968 | if (optlen < sizeof(cmd)) |
| 969 | return -EINVAL; |
| 970 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 971 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 972 | return -EFAULT; |
| 973 | |
| 974 | if (sin->sin_family != AF_INET) |
| 975 | return -EINVAL; |
| 976 | |
| 977 | if (!cmd.tcpm_key || !cmd.tcpm_keylen) { |
| 978 | if (!tcp_sk(sk)->md5sig_info) |
| 979 | return -ENOENT; |
| 980 | return tcp_v4_md5_do_del(sk, sin->sin_addr.s_addr); |
| 981 | } |
| 982 | |
| 983 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) |
| 984 | return -EINVAL; |
| 985 | |
| 986 | if (!tcp_sk(sk)->md5sig_info) { |
| 987 | struct tcp_sock *tp = tcp_sk(sk); |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 988 | struct tcp_md5sig_info *p = kzalloc(sizeof(*p), GFP_KERNEL); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 989 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 990 | if (!p) |
| 991 | return -EINVAL; |
| 992 | |
| 993 | tp->md5sig_info = p; |
David S. Miller | 3d7dbea | 2007-06-12 14:36:42 -0700 | [diff] [blame] | 994 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 995 | } |
| 996 | |
Arnaldo Carvalho de Melo | f668593 | 2006-11-17 11:06:01 -0200 | [diff] [blame] | 997 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 998 | if (!newkey) |
| 999 | return -ENOMEM; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1000 | return tcp_v4_md5_do_add(sk, sin->sin_addr.s_addr, |
| 1001 | newkey, cmd.tcpm_keylen); |
| 1002 | } |
| 1003 | |
| 1004 | static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, |
| 1005 | __be32 saddr, __be32 daddr, |
| 1006 | struct tcphdr *th, int protocol, |
YOSHIFUJI Hideaki | 9cb5734 | 2008-01-12 02:16:03 -0800 | [diff] [blame] | 1007 | unsigned int tcplen) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1008 | { |
| 1009 | struct scatterlist sg[4]; |
| 1010 | __u16 data_len; |
| 1011 | int block = 0; |
Al Viro | 8e5200f | 2006-11-20 18:06:37 -0800 | [diff] [blame] | 1012 | __sum16 old_checksum; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1013 | struct tcp_md5sig_pool *hp; |
| 1014 | struct tcp4_pseudohdr *bp; |
| 1015 | struct hash_desc *desc; |
| 1016 | int err; |
| 1017 | unsigned int nbytes = 0; |
| 1018 | |
| 1019 | /* |
| 1020 | * Okay, so RFC2385 is turned on for this connection, |
| 1021 | * so we need to generate the MD5 hash for the packet now. |
| 1022 | */ |
| 1023 | |
| 1024 | hp = tcp_get_md5sig_pool(); |
| 1025 | if (!hp) |
| 1026 | goto clear_hash_noput; |
| 1027 | |
| 1028 | bp = &hp->md5_blk.ip4; |
| 1029 | desc = &hp->md5_desc; |
| 1030 | |
| 1031 | /* |
| 1032 | * 1. the TCP pseudo-header (in the order: source IP address, |
| 1033 | * destination IP address, zero-padded protocol number, and |
| 1034 | * segment length) |
| 1035 | */ |
| 1036 | bp->saddr = saddr; |
| 1037 | bp->daddr = daddr; |
| 1038 | bp->pad = 0; |
| 1039 | bp->protocol = protocol; |
| 1040 | bp->len = htons(tcplen); |
David S. Miller | c7da57a | 2007-10-26 00:41:21 -0700 | [diff] [blame] | 1041 | |
| 1042 | sg_init_table(sg, 4); |
| 1043 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1044 | sg_set_buf(&sg[block++], bp, sizeof(*bp)); |
| 1045 | nbytes += sizeof(*bp); |
| 1046 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1047 | /* 2. the TCP header, excluding options, and assuming a |
| 1048 | * checksum of zero/ |
| 1049 | */ |
| 1050 | old_checksum = th->check; |
| 1051 | th->check = 0; |
| 1052 | sg_set_buf(&sg[block++], th, sizeof(struct tcphdr)); |
| 1053 | nbytes += sizeof(struct tcphdr); |
David S. Miller | 08dd1a5 | 2006-11-30 16:35:01 -0800 | [diff] [blame] | 1054 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1055 | /* 3. the TCP segment data (if any) */ |
| 1056 | data_len = tcplen - (th->doff << 2); |
| 1057 | if (data_len > 0) { |
| 1058 | unsigned char *data = (unsigned char *)th + (th->doff << 2); |
| 1059 | sg_set_buf(&sg[block++], data, data_len); |
| 1060 | nbytes += data_len; |
| 1061 | } |
| 1062 | |
| 1063 | /* 4. an independently-specified key or password, known to both |
| 1064 | * TCPs and presumably connection-specific |
| 1065 | */ |
| 1066 | sg_set_buf(&sg[block++], key->key, key->keylen); |
| 1067 | nbytes += key->keylen; |
| 1068 | |
Jens Axboe | c46f233 | 2007-10-31 12:06:37 +0100 | [diff] [blame] | 1069 | sg_mark_end(&sg[block - 1]); |
David S. Miller | c7da57a | 2007-10-26 00:41:21 -0700 | [diff] [blame] | 1070 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1071 | /* Now store the Hash into the packet */ |
| 1072 | err = crypto_hash_init(desc); |
| 1073 | if (err) |
| 1074 | goto clear_hash; |
| 1075 | err = crypto_hash_update(desc, sg, nbytes); |
| 1076 | if (err) |
| 1077 | goto clear_hash; |
| 1078 | err = crypto_hash_final(desc, md5_hash); |
| 1079 | if (err) |
| 1080 | goto clear_hash; |
| 1081 | |
| 1082 | /* Reset header, and free up the crypto */ |
| 1083 | tcp_put_md5sig_pool(); |
| 1084 | th->check = old_checksum; |
| 1085 | |
| 1086 | out: |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1087 | return 0; |
| 1088 | clear_hash: |
| 1089 | tcp_put_md5sig_pool(); |
| 1090 | clear_hash_noput: |
| 1091 | memset(md5_hash, 0, 16); |
| 1092 | goto out; |
| 1093 | } |
| 1094 | |
| 1095 | int tcp_v4_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, |
| 1096 | struct sock *sk, |
| 1097 | struct dst_entry *dst, |
| 1098 | struct request_sock *req, |
| 1099 | struct tcphdr *th, int protocol, |
YOSHIFUJI Hideaki | 9cb5734 | 2008-01-12 02:16:03 -0800 | [diff] [blame] | 1100 | unsigned int tcplen) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1101 | { |
| 1102 | __be32 saddr, daddr; |
| 1103 | |
| 1104 | if (sk) { |
| 1105 | saddr = inet_sk(sk)->saddr; |
| 1106 | daddr = inet_sk(sk)->daddr; |
| 1107 | } else { |
| 1108 | struct rtable *rt = (struct rtable *)dst; |
| 1109 | BUG_ON(!rt); |
| 1110 | saddr = rt->rt_src; |
| 1111 | daddr = rt->rt_dst; |
| 1112 | } |
| 1113 | return tcp_v4_do_calc_md5_hash(md5_hash, key, |
| 1114 | saddr, daddr, |
| 1115 | th, protocol, tcplen); |
| 1116 | } |
| 1117 | |
| 1118 | EXPORT_SYMBOL(tcp_v4_calc_md5_hash); |
| 1119 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1120 | 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] | 1121 | { |
| 1122 | /* |
| 1123 | * This gets called for each TCP segment that arrives |
| 1124 | * so we want to be efficient. |
| 1125 | * We have 3 drop cases: |
| 1126 | * o No MD5 hash and one expected. |
| 1127 | * o MD5 hash and we're not expecting one. |
| 1128 | * o MD5 hash and its wrong. |
| 1129 | */ |
| 1130 | __u8 *hash_location = NULL; |
| 1131 | struct tcp_md5sig_key *hash_expected; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1132 | const struct iphdr *iph = ip_hdr(skb); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1133 | struct tcphdr *th = tcp_hdr(skb); |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1134 | int length = (th->doff << 2) - sizeof(struct tcphdr); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1135 | int genhash; |
| 1136 | unsigned char *ptr; |
| 1137 | unsigned char newhash[16]; |
| 1138 | |
| 1139 | hash_expected = tcp_v4_md5_do_lookup(sk, iph->saddr); |
| 1140 | |
| 1141 | /* |
| 1142 | * If the TCP option length is less than the TCP_MD5SIG |
| 1143 | * option length, then we can shortcut |
| 1144 | */ |
| 1145 | if (length < TCPOLEN_MD5SIG) { |
| 1146 | if (hash_expected) |
| 1147 | return 1; |
| 1148 | else |
| 1149 | return 0; |
| 1150 | } |
| 1151 | |
| 1152 | /* Okay, we can't shortcut - we have to grub through the options */ |
| 1153 | ptr = (unsigned char *)(th + 1); |
| 1154 | while (length > 0) { |
| 1155 | int opcode = *ptr++; |
| 1156 | int opsize; |
| 1157 | |
| 1158 | switch (opcode) { |
| 1159 | case TCPOPT_EOL: |
| 1160 | goto done_opts; |
| 1161 | case TCPOPT_NOP: |
| 1162 | length--; |
| 1163 | continue; |
| 1164 | default: |
| 1165 | opsize = *ptr++; |
| 1166 | if (opsize < 2) |
| 1167 | goto done_opts; |
| 1168 | if (opsize > length) |
| 1169 | goto done_opts; |
| 1170 | |
| 1171 | if (opcode == TCPOPT_MD5SIG) { |
| 1172 | hash_location = ptr; |
| 1173 | goto done_opts; |
| 1174 | } |
| 1175 | } |
| 1176 | ptr += opsize-2; |
| 1177 | length -= opsize; |
| 1178 | } |
| 1179 | done_opts: |
| 1180 | /* We've parsed the options - do we have a hash? */ |
| 1181 | if (!hash_expected && !hash_location) |
| 1182 | return 0; |
| 1183 | |
| 1184 | if (hash_expected && !hash_location) { |
Leigh Brown | a9fc00c | 2006-12-17 17:13:10 -0800 | [diff] [blame] | 1185 | LIMIT_NETDEBUG(KERN_INFO "MD5 Hash expected but NOT found " |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1186 | "(" NIPQUAD_FMT ", %d)->(" NIPQUAD_FMT ", %d)\n", |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1187 | NIPQUAD(iph->saddr), ntohs(th->source), |
| 1188 | NIPQUAD(iph->daddr), ntohs(th->dest)); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1189 | return 1; |
| 1190 | } |
| 1191 | |
| 1192 | if (!hash_expected && hash_location) { |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1193 | LIMIT_NETDEBUG(KERN_INFO "MD5 Hash NOT expected but found " |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1194 | "(" NIPQUAD_FMT ", %d)->(" NIPQUAD_FMT ", %d)\n", |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1195 | NIPQUAD(iph->saddr), ntohs(th->source), |
| 1196 | NIPQUAD(iph->daddr), ntohs(th->dest)); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1197 | return 1; |
| 1198 | } |
| 1199 | |
| 1200 | /* Okay, so this is hash_expected and hash_location - |
| 1201 | * so we need to calculate the checksum. |
| 1202 | */ |
| 1203 | genhash = tcp_v4_do_calc_md5_hash(newhash, |
| 1204 | hash_expected, |
| 1205 | iph->saddr, iph->daddr, |
| 1206 | th, sk->sk_protocol, |
| 1207 | skb->len); |
| 1208 | |
| 1209 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
| 1210 | if (net_ratelimit()) { |
| 1211 | printk(KERN_INFO "MD5 Hash failed for " |
| 1212 | "(" NIPQUAD_FMT ", %d)->(" NIPQUAD_FMT ", %d)%s\n", |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1213 | NIPQUAD(iph->saddr), ntohs(th->source), |
| 1214 | NIPQUAD(iph->daddr), ntohs(th->dest), |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1215 | genhash ? " tcp_v4_calc_md5_hash failed" : ""); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1216 | } |
| 1217 | return 1; |
| 1218 | } |
| 1219 | return 0; |
| 1220 | } |
| 1221 | |
| 1222 | #endif |
| 1223 | |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 1224 | struct request_sock_ops tcp_request_sock_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | .family = PF_INET, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1226 | .obj_size = sizeof(struct tcp_request_sock), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | .rtx_syn_ack = tcp_v4_send_synack, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1228 | .send_ack = tcp_v4_reqsk_send_ack, |
| 1229 | .destructor = tcp_v4_reqsk_destructor, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | .send_reset = tcp_v4_send_reset, |
| 1231 | }; |
| 1232 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1233 | #ifdef CONFIG_TCP_MD5SIG |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 1234 | static struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1235 | .md5_lookup = tcp_v4_reqsk_md5_lookup, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1236 | }; |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 1237 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1238 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 1239 | static struct timewait_sock_ops tcp_timewait_sock_ops = { |
| 1240 | .twsk_obj_size = sizeof(struct tcp_timewait_sock), |
| 1241 | .twsk_unique = tcp_twsk_unique, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1242 | .twsk_destructor= tcp_twsk_destructor, |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 1243 | }; |
| 1244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) |
| 1246 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1247 | struct inet_request_sock *ireq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | struct tcp_options_received tmp_opt; |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1249 | struct request_sock *req; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1250 | __be32 saddr = ip_hdr(skb)->saddr; |
| 1251 | __be32 daddr = ip_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | __u32 isn = TCP_SKB_CB(skb)->when; |
| 1253 | struct dst_entry *dst = NULL; |
| 1254 | #ifdef CONFIG_SYN_COOKIES |
| 1255 | int want_cookie = 0; |
| 1256 | #else |
| 1257 | #define want_cookie 0 /* Argh, why doesn't gcc optimize this :( */ |
| 1258 | #endif |
| 1259 | |
| 1260 | /* Never answer to SYNs send to broadcast or multicast */ |
| 1261 | if (((struct rtable *)skb->dst)->rt_flags & |
| 1262 | (RTCF_BROADCAST | RTCF_MULTICAST)) |
| 1263 | goto drop; |
| 1264 | |
| 1265 | /* TW buckets are converted to open requests without |
| 1266 | * limitations, they conserve resources and peer is |
| 1267 | * evidently real one. |
| 1268 | */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1269 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | #ifdef CONFIG_SYN_COOKIES |
| 1271 | if (sysctl_tcp_syncookies) { |
| 1272 | want_cookie = 1; |
| 1273 | } else |
| 1274 | #endif |
| 1275 | goto drop; |
| 1276 | } |
| 1277 | |
| 1278 | /* Accept backlog is full. If we have already queued enough |
| 1279 | * of warm entries in syn queue, drop request. It is better than |
| 1280 | * clogging syn queue with openreqs with exponentially increasing |
| 1281 | * timeout. |
| 1282 | */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1283 | 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] | 1284 | goto drop; |
| 1285 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1286 | req = reqsk_alloc(&tcp_request_sock_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | if (!req) |
| 1288 | goto drop; |
| 1289 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1290 | #ifdef CONFIG_TCP_MD5SIG |
| 1291 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv4_ops; |
| 1292 | #endif |
| 1293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | tcp_clear_options(&tmp_opt); |
| 1295 | tmp_opt.mss_clamp = 536; |
| 1296 | tmp_opt.user_mss = tcp_sk(sk)->rx_opt.user_mss; |
| 1297 | |
| 1298 | tcp_parse_options(skb, &tmp_opt, 0); |
| 1299 | |
| 1300 | if (want_cookie) { |
| 1301 | tcp_clear_options(&tmp_opt); |
| 1302 | tmp_opt.saw_tstamp = 0; |
| 1303 | } |
| 1304 | |
| 1305 | if (tmp_opt.saw_tstamp && !tmp_opt.rcv_tsval) { |
| 1306 | /* Some OSes (unknown ones, but I see them on web server, which |
| 1307 | * contains information interesting only for windows' |
| 1308 | * users) do not send their stamp in SYN. It is easy case. |
| 1309 | * We simply do not advertise TS support. |
| 1310 | */ |
| 1311 | tmp_opt.saw_tstamp = 0; |
| 1312 | tmp_opt.tstamp_ok = 0; |
| 1313 | } |
| 1314 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
| 1315 | |
| 1316 | tcp_openreq_init(req, &tmp_opt, skb); |
| 1317 | |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 1318 | if (security_inet_conn_request(sk, skb, req)) |
| 1319 | goto drop_and_free; |
| 1320 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1321 | ireq = inet_rsk(req); |
| 1322 | ireq->loc_addr = daddr; |
| 1323 | ireq->rmt_addr = saddr; |
| 1324 | ireq->opt = tcp_v4_save_options(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | if (!want_cookie) |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1326 | TCP_ECN_create_request(req, tcp_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | |
| 1328 | if (want_cookie) { |
| 1329 | #ifdef CONFIG_SYN_COOKIES |
| 1330 | syn_flood_warning(skb); |
| 1331 | #endif |
| 1332 | isn = cookie_v4_init_sequence(sk, skb, &req->mss); |
| 1333 | } else if (!isn) { |
| 1334 | struct inet_peer *peer = NULL; |
| 1335 | |
| 1336 | /* VJ's idea. We save last timestamp seen |
| 1337 | * from the destination in peer table, when entering |
| 1338 | * state TIME-WAIT, and check against it before |
| 1339 | * accepting new connection request. |
| 1340 | * |
| 1341 | * If "isn" is not zero, this request hit alive |
| 1342 | * timewait bucket, so that all the necessary checks |
| 1343 | * are made in the function processing timewait state. |
| 1344 | */ |
| 1345 | if (tmp_opt.saw_tstamp && |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 1346 | tcp_death_row.sysctl_tw_recycle && |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1347 | (dst = inet_csk_route_req(sk, req)) != NULL && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | (peer = rt_get_peer((struct rtable *)dst)) != NULL && |
| 1349 | peer->v4daddr == saddr) { |
James Morris | 9d729f7 | 2007-03-04 16:12:44 -0800 | [diff] [blame] | 1350 | if (get_seconds() < peer->tcp_ts_stamp + TCP_PAWS_MSL && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | (s32)(peer->tcp_ts - req->ts_recent) > |
| 1352 | TCP_PAWS_WINDOW) { |
| 1353 | NET_INC_STATS_BH(LINUX_MIB_PAWSPASSIVEREJECTED); |
| 1354 | dst_release(dst); |
| 1355 | goto drop_and_free; |
| 1356 | } |
| 1357 | } |
| 1358 | /* Kill the following clause, if you dislike this way. */ |
| 1359 | else if (!sysctl_tcp_syncookies && |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1360 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | (sysctl_max_syn_backlog >> 2)) && |
| 1362 | (!peer || !peer->tcp_ts_stamp) && |
| 1363 | (!dst || !dst_metric(dst, RTAX_RTT))) { |
| 1364 | /* Without syncookies last quarter of |
| 1365 | * backlog is filled with destinations, |
| 1366 | * proven to be alive. |
| 1367 | * It means that we continue to communicate |
| 1368 | * to destinations, already remembered |
| 1369 | * to the moment of synflood. |
| 1370 | */ |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 1371 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open " |
| 1372 | "request from %u.%u.%u.%u/%u\n", |
| 1373 | NIPQUAD(saddr), |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1374 | ntohs(tcp_hdr(skb)->source)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | dst_release(dst); |
| 1376 | goto drop_and_free; |
| 1377 | } |
| 1378 | |
Gerrit Renker | a94f723 | 2006-11-10 14:06:49 -0800 | [diff] [blame] | 1379 | isn = tcp_v4_init_sequence(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | } |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1381 | tcp_rsk(req)->snt_isn = isn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | |
| 1383 | if (tcp_v4_send_synack(sk, req, dst)) |
| 1384 | goto drop_and_free; |
| 1385 | |
| 1386 | if (want_cookie) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1387 | reqsk_free(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | } else { |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 1389 | inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | } |
| 1391 | return 0; |
| 1392 | |
| 1393 | drop_and_free: |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1394 | reqsk_free(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | drop: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | return 0; |
| 1397 | } |
| 1398 | |
| 1399 | |
| 1400 | /* |
| 1401 | * The three way handshake has completed - we got a valid synack - |
| 1402 | * now create the new socket. |
| 1403 | */ |
| 1404 | 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] | 1405 | struct request_sock *req, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | struct dst_entry *dst) |
| 1407 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1408 | struct inet_request_sock *ireq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | struct inet_sock *newinet; |
| 1410 | struct tcp_sock *newtp; |
| 1411 | struct sock *newsk; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1412 | #ifdef CONFIG_TCP_MD5SIG |
| 1413 | struct tcp_md5sig_key *key; |
| 1414 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | |
| 1416 | if (sk_acceptq_is_full(sk)) |
| 1417 | goto exit_overflow; |
| 1418 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1419 | if (!dst && (dst = inet_csk_route_req(sk, req)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | goto exit; |
| 1421 | |
| 1422 | newsk = tcp_create_openreq_child(sk, req, skb); |
| 1423 | if (!newsk) |
| 1424 | goto exit; |
| 1425 | |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 1426 | newsk->sk_gso_type = SKB_GSO_TCPV4; |
Arnaldo Carvalho de Melo | 6cbb0df | 2005-08-09 19:49:02 -0700 | [diff] [blame] | 1427 | sk_setup_caps(newsk, dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | |
| 1429 | newtp = tcp_sk(newsk); |
| 1430 | newinet = inet_sk(newsk); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1431 | ireq = inet_rsk(req); |
| 1432 | newinet->daddr = ireq->rmt_addr; |
| 1433 | newinet->rcv_saddr = ireq->loc_addr; |
| 1434 | newinet->saddr = ireq->loc_addr; |
| 1435 | newinet->opt = ireq->opt; |
| 1436 | ireq->opt = NULL; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1437 | newinet->mc_index = inet_iif(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1438 | newinet->mc_ttl = ip_hdr(skb)->ttl; |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1439 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | if (newinet->opt) |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1441 | inet_csk(newsk)->icsk_ext_hdr_len = newinet->opt->optlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | newinet->id = newtp->write_seq ^ jiffies; |
| 1443 | |
John Heffner | 5d424d5 | 2006-03-20 17:53:41 -0800 | [diff] [blame] | 1444 | tcp_mtup_init(newsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | tcp_sync_mss(newsk, dst_mtu(dst)); |
| 1446 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); |
| 1447 | tcp_initialize_rcv_mss(newsk); |
| 1448 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1449 | #ifdef CONFIG_TCP_MD5SIG |
| 1450 | /* Copy over the MD5 key from the original socket */ |
| 1451 | if ((key = tcp_v4_md5_do_lookup(sk, newinet->daddr)) != NULL) { |
| 1452 | /* |
| 1453 | * We're using one, so create a matching key |
| 1454 | * on the newsk structure. If we fail to get |
| 1455 | * memory, then we end up not copying the key |
| 1456 | * across. Shucks. |
| 1457 | */ |
Arnaldo Carvalho de Melo | f668593 | 2006-11-17 11:06:01 -0200 | [diff] [blame] | 1458 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
| 1459 | if (newkey != NULL) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1460 | tcp_v4_md5_do_add(newsk, inet_sk(sk)->daddr, |
| 1461 | newkey, key->keylen); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1462 | } |
| 1463 | #endif |
| 1464 | |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1465 | __inet_hash_nolisten(newsk); |
| 1466 | __inet_inherit_port(sk, newsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | |
| 1468 | return newsk; |
| 1469 | |
| 1470 | exit_overflow: |
| 1471 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); |
| 1472 | exit: |
| 1473 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); |
| 1474 | dst_release(dst); |
| 1475 | return NULL; |
| 1476 | } |
| 1477 | |
| 1478 | static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) |
| 1479 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1480 | struct tcphdr *th = tcp_hdr(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1481 | const struct iphdr *iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | struct sock *nsk; |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1483 | struct request_sock **prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | /* Find possible connection requests. */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1485 | struct request_sock *req = inet_csk_search_req(sk, &prev, th->source, |
| 1486 | iph->saddr, iph->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | if (req) |
| 1488 | return tcp_check_req(sk, skb, req, prev); |
| 1489 | |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 1490 | nsk = inet_lookup_established(sk->sk_net, &tcp_hashinfo, iph->saddr, |
| 1491 | th->source, iph->daddr, th->dest, inet_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | |
| 1493 | if (nsk) { |
| 1494 | if (nsk->sk_state != TCP_TIME_WAIT) { |
| 1495 | bh_lock_sock(nsk); |
| 1496 | return nsk; |
| 1497 | } |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1498 | inet_twsk_put(inet_twsk(nsk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1499 | return NULL; |
| 1500 | } |
| 1501 | |
| 1502 | #ifdef CONFIG_SYN_COOKIES |
| 1503 | if (!th->rst && !th->syn && th->ack) |
| 1504 | sk = cookie_v4_check(sk, skb, &(IPCB(skb)->opt)); |
| 1505 | #endif |
| 1506 | return sk; |
| 1507 | } |
| 1508 | |
Al Viro | b51655b | 2006-11-14 21:40:42 -0800 | [diff] [blame] | 1509 | static __sum16 tcp_v4_checksum_init(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1511 | const struct iphdr *iph = ip_hdr(skb); |
| 1512 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1513 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1514 | if (!tcp_v4_check(skb->len, iph->saddr, |
| 1515 | iph->daddr, skb->csum)) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1516 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | return 0; |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1518 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | } |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1520 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1521 | skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1522 | skb->len, IPPROTO_TCP, 0); |
| 1523 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | if (skb->len <= 76) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1525 | return __skb_checksum_complete(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | } |
| 1527 | return 0; |
| 1528 | } |
| 1529 | |
| 1530 | |
| 1531 | /* The socket must have it's spinlock held when we get |
| 1532 | * here. |
| 1533 | * |
| 1534 | * We have a potential double-lock case here, so even when |
| 1535 | * doing backlog processing we use the BH locking scheme. |
| 1536 | * This is because we cannot sleep with the original spinlock |
| 1537 | * held. |
| 1538 | */ |
| 1539 | int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) |
| 1540 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1541 | struct sock *rsk; |
| 1542 | #ifdef CONFIG_TCP_MD5SIG |
| 1543 | /* |
| 1544 | * We really want to reject the packet as early as possible |
| 1545 | * if: |
| 1546 | * o We're expecting an MD5'd packet and this is no MD5 tcp option |
| 1547 | * o There is an MD5 option and we're not expecting one |
| 1548 | */ |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 1549 | if (tcp_v4_inbound_md5_hash(sk, skb)) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1550 | goto discard; |
| 1551 | #endif |
| 1552 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
| 1554 | TCP_CHECK_TIMER(sk); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1555 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1556 | rsk = sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | goto reset; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1558 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | TCP_CHECK_TIMER(sk); |
| 1560 | return 0; |
| 1561 | } |
| 1562 | |
Arnaldo Carvalho de Melo | ab6a5bb | 2007-03-18 17:43:48 -0700 | [diff] [blame] | 1563 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | goto csum_err; |
| 1565 | |
| 1566 | if (sk->sk_state == TCP_LISTEN) { |
| 1567 | struct sock *nsk = tcp_v4_hnd_req(sk, skb); |
| 1568 | if (!nsk) |
| 1569 | goto discard; |
| 1570 | |
| 1571 | if (nsk != sk) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1572 | if (tcp_child_process(sk, nsk, skb)) { |
| 1573 | rsk = nsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | goto reset; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1575 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | return 0; |
| 1577 | } |
| 1578 | } |
| 1579 | |
| 1580 | TCP_CHECK_TIMER(sk); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1581 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1582 | rsk = sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | goto reset; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1584 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | TCP_CHECK_TIMER(sk); |
| 1586 | return 0; |
| 1587 | |
| 1588 | reset: |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1589 | tcp_v4_send_reset(rsk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1590 | discard: |
| 1591 | kfree_skb(skb); |
| 1592 | /* Be careful here. If this function gets more complicated and |
| 1593 | * gcc suffers from register pressure on the x86, sk (in %ebx) |
| 1594 | * might be destroyed here. This current version compiles correctly, |
| 1595 | * but you have been warned. |
| 1596 | */ |
| 1597 | return 0; |
| 1598 | |
| 1599 | csum_err: |
| 1600 | TCP_INC_STATS_BH(TCP_MIB_INERRS); |
| 1601 | goto discard; |
| 1602 | } |
| 1603 | |
| 1604 | /* |
| 1605 | * From tcp_input.c |
| 1606 | */ |
| 1607 | |
| 1608 | int tcp_v4_rcv(struct sk_buff *skb) |
| 1609 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1610 | const struct iphdr *iph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | struct tcphdr *th; |
| 1612 | struct sock *sk; |
| 1613 | int ret; |
| 1614 | |
| 1615 | if (skb->pkt_type != PACKET_HOST) |
| 1616 | goto discard_it; |
| 1617 | |
| 1618 | /* Count it even if it's bad */ |
| 1619 | TCP_INC_STATS_BH(TCP_MIB_INSEGS); |
| 1620 | |
| 1621 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) |
| 1622 | goto discard_it; |
| 1623 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1624 | th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1625 | |
| 1626 | if (th->doff < sizeof(struct tcphdr) / 4) |
| 1627 | goto bad_packet; |
| 1628 | if (!pskb_may_pull(skb, th->doff * 4)) |
| 1629 | goto discard_it; |
| 1630 | |
| 1631 | /* An explanation is required here, I think. |
| 1632 | * Packet length and doff are validated by header prediction, |
Stephen Hemminger | caa20d9a | 2005-11-10 17:13:47 -0800 | [diff] [blame] | 1633 | * provided case of th->doff==0 is eliminated. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | * So, we defer the checks. */ |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 1635 | if (!skb_csum_unnecessary(skb) && tcp_v4_checksum_init(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | goto bad_packet; |
| 1637 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1638 | th = tcp_hdr(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1639 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
| 1641 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + |
| 1642 | skb->len - th->doff * 4); |
| 1643 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); |
| 1644 | TCP_SKB_CB(skb)->when = 0; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1645 | TCP_SKB_CB(skb)->flags = iph->tos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | TCP_SKB_CB(skb)->sacked = 0; |
| 1647 | |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 1648 | sk = __inet_lookup(skb->dev->nd_net, &tcp_hashinfo, iph->saddr, |
| 1649 | th->source, iph->daddr, th->dest, inet_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | if (!sk) |
| 1651 | goto no_tcp_socket; |
| 1652 | |
| 1653 | process: |
| 1654 | if (sk->sk_state == TCP_TIME_WAIT) |
| 1655 | goto do_time_wait; |
| 1656 | |
| 1657 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 1658 | goto discard_and_relse; |
Patrick McHardy | b59c270 | 2006-01-06 23:06:10 -0800 | [diff] [blame] | 1659 | nf_reset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1660 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 1661 | if (sk_filter(sk, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | goto discard_and_relse; |
| 1663 | |
| 1664 | skb->dev = NULL; |
| 1665 | |
Ingo Molnar | c636618 | 2006-07-03 00:25:13 -0700 | [diff] [blame] | 1666 | bh_lock_sock_nested(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | ret = 0; |
| 1668 | if (!sock_owned_by_user(sk)) { |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1669 | #ifdef CONFIG_NET_DMA |
| 1670 | struct tcp_sock *tp = tcp_sk(sk); |
| 1671 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
| 1672 | tp->ucopy.dma_chan = get_softnet_dma(); |
| 1673 | if (tp->ucopy.dma_chan) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | ret = tcp_v4_do_rcv(sk, skb); |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1675 | else |
| 1676 | #endif |
| 1677 | { |
| 1678 | if (!tcp_prequeue(sk, skb)) |
| 1679 | ret = tcp_v4_do_rcv(sk, skb); |
| 1680 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | } else |
| 1682 | sk_add_backlog(sk, skb); |
| 1683 | bh_unlock_sock(sk); |
| 1684 | |
| 1685 | sock_put(sk); |
| 1686 | |
| 1687 | return ret; |
| 1688 | |
| 1689 | no_tcp_socket: |
| 1690 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 1691 | goto discard_it; |
| 1692 | |
| 1693 | if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { |
| 1694 | bad_packet: |
| 1695 | TCP_INC_STATS_BH(TCP_MIB_INERRS); |
| 1696 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1697 | tcp_v4_send_reset(NULL, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | } |
| 1699 | |
| 1700 | discard_it: |
| 1701 | /* Discard frame. */ |
| 1702 | kfree_skb(skb); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1703 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | |
| 1705 | discard_and_relse: |
| 1706 | sock_put(sk); |
| 1707 | goto discard_it; |
| 1708 | |
| 1709 | do_time_wait: |
| 1710 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1711 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | goto discard_it; |
| 1713 | } |
| 1714 | |
| 1715 | if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { |
| 1716 | TCP_INC_STATS_BH(TCP_MIB_INERRS); |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1717 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | goto discard_it; |
| 1719 | } |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1720 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1721 | case TCP_TW_SYN: { |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 1722 | struct sock *sk2 = inet_lookup_listener(skb->dev->nd_net, |
| 1723 | &tcp_hashinfo, |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1724 | iph->daddr, th->dest, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1725 | inet_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1726 | if (sk2) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1727 | inet_twsk_deschedule(inet_twsk(sk), &tcp_death_row); |
| 1728 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | sk = sk2; |
| 1730 | goto process; |
| 1731 | } |
| 1732 | /* Fall through to ACK */ |
| 1733 | } |
| 1734 | case TCP_TW_ACK: |
| 1735 | tcp_v4_timewait_ack(sk, skb); |
| 1736 | break; |
| 1737 | case TCP_TW_RST: |
| 1738 | goto no_tcp_socket; |
| 1739 | case TCP_TW_SUCCESS:; |
| 1740 | } |
| 1741 | goto discard_it; |
| 1742 | } |
| 1743 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | /* VJ's idea. Save last timestamp seen from this destination |
| 1745 | * and hold it at least for normal timewait interval to use for duplicate |
| 1746 | * segment detection in subsequent connections, before they enter synchronized |
| 1747 | * state. |
| 1748 | */ |
| 1749 | |
| 1750 | int tcp_v4_remember_stamp(struct sock *sk) |
| 1751 | { |
| 1752 | struct inet_sock *inet = inet_sk(sk); |
| 1753 | struct tcp_sock *tp = tcp_sk(sk); |
| 1754 | struct rtable *rt = (struct rtable *)__sk_dst_get(sk); |
| 1755 | struct inet_peer *peer = NULL; |
| 1756 | int release_it = 0; |
| 1757 | |
| 1758 | if (!rt || rt->rt_dst != inet->daddr) { |
| 1759 | peer = inet_getpeer(inet->daddr, 1); |
| 1760 | release_it = 1; |
| 1761 | } else { |
| 1762 | if (!rt->peer) |
| 1763 | rt_bind_peer(rt, 1); |
| 1764 | peer = rt->peer; |
| 1765 | } |
| 1766 | |
| 1767 | if (peer) { |
| 1768 | if ((s32)(peer->tcp_ts - tp->rx_opt.ts_recent) <= 0 || |
James Morris | 9d729f7 | 2007-03-04 16:12:44 -0800 | [diff] [blame] | 1769 | (peer->tcp_ts_stamp + TCP_PAWS_MSL < get_seconds() && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1770 | peer->tcp_ts_stamp <= tp->rx_opt.ts_recent_stamp)) { |
| 1771 | peer->tcp_ts_stamp = tp->rx_opt.ts_recent_stamp; |
| 1772 | peer->tcp_ts = tp->rx_opt.ts_recent; |
| 1773 | } |
| 1774 | if (release_it) |
| 1775 | inet_putpeer(peer); |
| 1776 | return 1; |
| 1777 | } |
| 1778 | |
| 1779 | return 0; |
| 1780 | } |
| 1781 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1782 | int tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1783 | { |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1784 | struct inet_peer *peer = inet_getpeer(tw->tw_daddr, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | |
| 1786 | if (peer) { |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1787 | const struct tcp_timewait_sock *tcptw = tcp_twsk((struct sock *)tw); |
| 1788 | |
| 1789 | if ((s32)(peer->tcp_ts - tcptw->tw_ts_recent) <= 0 || |
James Morris | 9d729f7 | 2007-03-04 16:12:44 -0800 | [diff] [blame] | 1790 | (peer->tcp_ts_stamp + TCP_PAWS_MSL < get_seconds() && |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1791 | peer->tcp_ts_stamp <= tcptw->tw_ts_recent_stamp)) { |
| 1792 | peer->tcp_ts_stamp = tcptw->tw_ts_recent_stamp; |
| 1793 | peer->tcp_ts = tcptw->tw_ts_recent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1794 | } |
| 1795 | inet_putpeer(peer); |
| 1796 | return 1; |
| 1797 | } |
| 1798 | |
| 1799 | return 0; |
| 1800 | } |
| 1801 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1802 | struct inet_connection_sock_af_ops ipv4_specific = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1803 | .queue_xmit = ip_queue_xmit, |
| 1804 | .send_check = tcp_v4_send_check, |
| 1805 | .rebuild_header = inet_sk_rebuild_header, |
| 1806 | .conn_request = tcp_v4_conn_request, |
| 1807 | .syn_recv_sock = tcp_v4_syn_recv_sock, |
| 1808 | .remember_stamp = tcp_v4_remember_stamp, |
| 1809 | .net_header_len = sizeof(struct iphdr), |
| 1810 | .setsockopt = ip_setsockopt, |
| 1811 | .getsockopt = ip_getsockopt, |
| 1812 | .addr2sockaddr = inet_csk_addr2sockaddr, |
| 1813 | .sockaddr_len = sizeof(struct sockaddr_in), |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1814 | .bind_conflict = inet_csk_bind_conflict, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1815 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1816 | .compat_setsockopt = compat_ip_setsockopt, |
| 1817 | .compat_getsockopt = compat_ip_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1818 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | }; |
| 1820 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1821 | #ifdef CONFIG_TCP_MD5SIG |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 1822 | static struct tcp_sock_af_ops tcp_sock_ipv4_specific = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1823 | .md5_lookup = tcp_v4_md5_lookup, |
| 1824 | .calc_md5_hash = tcp_v4_calc_md5_hash, |
| 1825 | .md5_add = tcp_v4_md5_add_func, |
| 1826 | .md5_parse = tcp_v4_parse_md5_keys, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1827 | }; |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 1828 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1829 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1830 | /* NOTE: A lot of things set to zero explicitly by call to |
| 1831 | * sk_alloc() so need not be done here. |
| 1832 | */ |
| 1833 | static int tcp_v4_init_sock(struct sock *sk) |
| 1834 | { |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1835 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1836 | struct tcp_sock *tp = tcp_sk(sk); |
| 1837 | |
| 1838 | skb_queue_head_init(&tp->out_of_order_queue); |
| 1839 | tcp_init_xmit_timers(sk); |
| 1840 | tcp_prequeue_init(tp); |
| 1841 | |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1842 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | tp->mdev = TCP_TIMEOUT_INIT; |
| 1844 | |
| 1845 | /* So many TCP implementations out there (incorrectly) count the |
| 1846 | * initial SYN frame in their delayed-ACK and congestion control |
| 1847 | * algorithms that we must have the following bandaid to talk |
| 1848 | * efficiently to them. -DaveM |
| 1849 | */ |
| 1850 | tp->snd_cwnd = 2; |
| 1851 | |
| 1852 | /* See draft-stevens-tcpca-spec-01 for discussion of the |
| 1853 | * initialization of these values. |
| 1854 | */ |
| 1855 | tp->snd_ssthresh = 0x7fffffff; /* Infinity */ |
| 1856 | tp->snd_cwnd_clamp = ~0; |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 1857 | tp->mss_cache = 536; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1858 | |
| 1859 | tp->reordering = sysctl_tcp_reordering; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1860 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1861 | |
| 1862 | sk->sk_state = TCP_CLOSE; |
| 1863 | |
| 1864 | sk->sk_write_space = sk_stream_write_space; |
| 1865 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); |
| 1866 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1867 | icsk->icsk_af_ops = &ipv4_specific; |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1868 | icsk->icsk_sync_mss = tcp_sync_mss; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1869 | #ifdef CONFIG_TCP_MD5SIG |
| 1870 | tp->af_specific = &tcp_sock_ipv4_specific; |
| 1871 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | |
| 1873 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
| 1874 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; |
| 1875 | |
| 1876 | atomic_inc(&tcp_sockets_allocated); |
| 1877 | |
| 1878 | return 0; |
| 1879 | } |
| 1880 | |
| 1881 | int tcp_v4_destroy_sock(struct sock *sk) |
| 1882 | { |
| 1883 | struct tcp_sock *tp = tcp_sk(sk); |
| 1884 | |
| 1885 | tcp_clear_xmit_timers(sk); |
| 1886 | |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1887 | tcp_cleanup_congestion_control(sk); |
Stephen Hemminger | 317a76f | 2005-06-23 12:19:55 -0700 | [diff] [blame] | 1888 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1889 | /* Cleanup up the write buffer. */ |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 1890 | tcp_write_queue_purge(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1891 | |
| 1892 | /* Cleans up our, hopefully empty, out_of_order_queue. */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1893 | __skb_queue_purge(&tp->out_of_order_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1894 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1895 | #ifdef CONFIG_TCP_MD5SIG |
| 1896 | /* Clean up the MD5 key list, if any */ |
| 1897 | if (tp->md5sig_info) { |
| 1898 | tcp_v4_clear_md5_list(sk); |
| 1899 | kfree(tp->md5sig_info); |
| 1900 | tp->md5sig_info = NULL; |
| 1901 | } |
| 1902 | #endif |
| 1903 | |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1904 | #ifdef CONFIG_NET_DMA |
| 1905 | /* Cleans up our sk_async_wait_queue */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1906 | __skb_queue_purge(&sk->sk_async_wait_queue); |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1907 | #endif |
| 1908 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | /* Clean prequeue, it must be empty really */ |
| 1910 | __skb_queue_purge(&tp->ucopy.prequeue); |
| 1911 | |
| 1912 | /* Clean up a referenced TCP bind bucket. */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1913 | if (inet_csk(sk)->icsk_bind_hash) |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1914 | inet_put_port(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1915 | |
| 1916 | /* |
| 1917 | * If sendmsg cached page exists, toss it. |
| 1918 | */ |
| 1919 | if (sk->sk_sndmsg_page) { |
| 1920 | __free_page(sk->sk_sndmsg_page); |
| 1921 | sk->sk_sndmsg_page = NULL; |
| 1922 | } |
| 1923 | |
| 1924 | atomic_dec(&tcp_sockets_allocated); |
| 1925 | |
| 1926 | return 0; |
| 1927 | } |
| 1928 | |
| 1929 | EXPORT_SYMBOL(tcp_v4_destroy_sock); |
| 1930 | |
| 1931 | #ifdef CONFIG_PROC_FS |
| 1932 | /* Proc filesystem TCP sock list dumping. */ |
| 1933 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1934 | static inline struct inet_timewait_sock *tw_head(struct hlist_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | { |
| 1936 | return hlist_empty(head) ? NULL : |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1937 | list_entry(head->first, struct inet_timewait_sock, tw_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | } |
| 1939 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1940 | 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] | 1941 | { |
| 1942 | return tw->tw_node.next ? |
| 1943 | hlist_entry(tw->tw_node.next, typeof(*tw), tw_node) : NULL; |
| 1944 | } |
| 1945 | |
| 1946 | static void *listening_get_next(struct seq_file *seq, void *cur) |
| 1947 | { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1948 | struct inet_connection_sock *icsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | struct hlist_node *node; |
| 1950 | struct sock *sk = cur; |
| 1951 | struct tcp_iter_state* st = seq->private; |
| 1952 | |
| 1953 | if (!sk) { |
| 1954 | st->bucket = 0; |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 1955 | sk = sk_head(&tcp_hashinfo.listening_hash[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1956 | goto get_sk; |
| 1957 | } |
| 1958 | |
| 1959 | ++st->num; |
| 1960 | |
| 1961 | if (st->state == TCP_SEQ_STATE_OPENREQ) { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1962 | struct request_sock *req = cur; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1963 | |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 1964 | icsk = inet_csk(st->syn_wait_sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1965 | req = req->dl_next; |
| 1966 | while (1) { |
| 1967 | while (req) { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1968 | if (req->rsk_ops->family == st->family) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | cur = req; |
| 1970 | goto out; |
| 1971 | } |
| 1972 | req = req->dl_next; |
| 1973 | } |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 1974 | if (++st->sbucket >= icsk->icsk_accept_queue.listen_opt->nr_table_entries) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1975 | break; |
| 1976 | get_req: |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1977 | req = icsk->icsk_accept_queue.listen_opt->syn_table[st->sbucket]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1978 | } |
| 1979 | sk = sk_next(st->syn_wait_sk); |
| 1980 | st->state = TCP_SEQ_STATE_LISTENING; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1981 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | } else { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1983 | icsk = inet_csk(sk); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1984 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
| 1985 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | goto start_req; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1987 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1988 | sk = sk_next(sk); |
| 1989 | } |
| 1990 | get_sk: |
| 1991 | sk_for_each_from(sk, node) { |
| 1992 | if (sk->sk_family == st->family) { |
| 1993 | cur = sk; |
| 1994 | goto out; |
| 1995 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1996 | icsk = inet_csk(sk); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1997 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
| 1998 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1999 | start_req: |
| 2000 | st->uid = sock_i_uid(sk); |
| 2001 | st->syn_wait_sk = sk; |
| 2002 | st->state = TCP_SEQ_STATE_OPENREQ; |
| 2003 | st->sbucket = 0; |
| 2004 | goto get_req; |
| 2005 | } |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2006 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2007 | } |
Arnaldo Carvalho de Melo | 0f7ff92 | 2005-08-09 19:59:44 -0700 | [diff] [blame] | 2008 | if (++st->bucket < INET_LHTABLE_SIZE) { |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2009 | sk = sk_head(&tcp_hashinfo.listening_hash[st->bucket]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2010 | goto get_sk; |
| 2011 | } |
| 2012 | cur = NULL; |
| 2013 | out: |
| 2014 | return cur; |
| 2015 | } |
| 2016 | |
| 2017 | static void *listening_get_idx(struct seq_file *seq, loff_t *pos) |
| 2018 | { |
| 2019 | void *rc = listening_get_next(seq, NULL); |
| 2020 | |
| 2021 | while (rc && *pos) { |
| 2022 | rc = listening_get_next(seq, rc); |
| 2023 | --*pos; |
| 2024 | } |
| 2025 | return rc; |
| 2026 | } |
| 2027 | |
| 2028 | static void *established_get_first(struct seq_file *seq) |
| 2029 | { |
| 2030 | struct tcp_iter_state* st = seq->private; |
| 2031 | void *rc = NULL; |
| 2032 | |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2033 | for (st->bucket = 0; st->bucket < tcp_hashinfo.ehash_size; ++st->bucket) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2034 | struct sock *sk; |
| 2035 | struct hlist_node *node; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2036 | struct inet_timewait_sock *tw; |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 2037 | rwlock_t *lock = inet_ehash_lockp(&tcp_hashinfo, st->bucket); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 2039 | read_lock_bh(lock); |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2040 | sk_for_each(sk, node, &tcp_hashinfo.ehash[st->bucket].chain) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | if (sk->sk_family != st->family) { |
| 2042 | continue; |
| 2043 | } |
| 2044 | rc = sk; |
| 2045 | goto out; |
| 2046 | } |
| 2047 | st->state = TCP_SEQ_STATE_TIME_WAIT; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2048 | inet_twsk_for_each(tw, node, |
Eric Dumazet | dbca9b275 | 2007-02-08 14:16:46 -0800 | [diff] [blame] | 2049 | &tcp_hashinfo.ehash[st->bucket].twchain) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | if (tw->tw_family != st->family) { |
| 2051 | continue; |
| 2052 | } |
| 2053 | rc = tw; |
| 2054 | goto out; |
| 2055 | } |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 2056 | read_unlock_bh(lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
| 2058 | } |
| 2059 | out: |
| 2060 | return rc; |
| 2061 | } |
| 2062 | |
| 2063 | static void *established_get_next(struct seq_file *seq, void *cur) |
| 2064 | { |
| 2065 | struct sock *sk = cur; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2066 | struct inet_timewait_sock *tw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2067 | struct hlist_node *node; |
| 2068 | struct tcp_iter_state* st = seq->private; |
| 2069 | |
| 2070 | ++st->num; |
| 2071 | |
| 2072 | if (st->state == TCP_SEQ_STATE_TIME_WAIT) { |
| 2073 | tw = cur; |
| 2074 | tw = tw_next(tw); |
| 2075 | get_tw: |
| 2076 | while (tw && tw->tw_family != st->family) { |
| 2077 | tw = tw_next(tw); |
| 2078 | } |
| 2079 | if (tw) { |
| 2080 | cur = tw; |
| 2081 | goto out; |
| 2082 | } |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 2083 | read_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
| 2085 | |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2086 | if (++st->bucket < tcp_hashinfo.ehash_size) { |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 2087 | read_lock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2088 | sk = sk_head(&tcp_hashinfo.ehash[st->bucket].chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | } else { |
| 2090 | cur = NULL; |
| 2091 | goto out; |
| 2092 | } |
| 2093 | } else |
| 2094 | sk = sk_next(sk); |
| 2095 | |
| 2096 | sk_for_each_from(sk, node) { |
| 2097 | if (sk->sk_family == st->family) |
| 2098 | goto found; |
| 2099 | } |
| 2100 | |
| 2101 | st->state = TCP_SEQ_STATE_TIME_WAIT; |
Eric Dumazet | dbca9b275 | 2007-02-08 14:16:46 -0800 | [diff] [blame] | 2102 | tw = tw_head(&tcp_hashinfo.ehash[st->bucket].twchain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2103 | goto get_tw; |
| 2104 | found: |
| 2105 | cur = sk; |
| 2106 | out: |
| 2107 | return cur; |
| 2108 | } |
| 2109 | |
| 2110 | static void *established_get_idx(struct seq_file *seq, loff_t pos) |
| 2111 | { |
| 2112 | void *rc = established_get_first(seq); |
| 2113 | |
| 2114 | while (rc && pos) { |
| 2115 | rc = established_get_next(seq, rc); |
| 2116 | --pos; |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 2117 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2118 | return rc; |
| 2119 | } |
| 2120 | |
| 2121 | static void *tcp_get_idx(struct seq_file *seq, loff_t pos) |
| 2122 | { |
| 2123 | void *rc; |
| 2124 | struct tcp_iter_state* st = seq->private; |
| 2125 | |
Arnaldo Carvalho de Melo | f3f05f7 | 2005-08-09 20:08:09 -0700 | [diff] [blame] | 2126 | inet_listen_lock(&tcp_hashinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2127 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2128 | rc = listening_get_idx(seq, &pos); |
| 2129 | |
| 2130 | if (!rc) { |
Arnaldo Carvalho de Melo | f3f05f7 | 2005-08-09 20:08:09 -0700 | [diff] [blame] | 2131 | inet_listen_unlock(&tcp_hashinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2132 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
| 2133 | rc = established_get_idx(seq, pos); |
| 2134 | } |
| 2135 | |
| 2136 | return rc; |
| 2137 | } |
| 2138 | |
| 2139 | static void *tcp_seq_start(struct seq_file *seq, loff_t *pos) |
| 2140 | { |
| 2141 | struct tcp_iter_state* st = seq->private; |
| 2142 | st->state = TCP_SEQ_STATE_LISTENING; |
| 2143 | st->num = 0; |
| 2144 | return *pos ? tcp_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| 2145 | } |
| 2146 | |
| 2147 | static void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2148 | { |
| 2149 | void *rc = NULL; |
| 2150 | struct tcp_iter_state* st; |
| 2151 | |
| 2152 | if (v == SEQ_START_TOKEN) { |
| 2153 | rc = tcp_get_idx(seq, 0); |
| 2154 | goto out; |
| 2155 | } |
| 2156 | st = seq->private; |
| 2157 | |
| 2158 | switch (st->state) { |
| 2159 | case TCP_SEQ_STATE_OPENREQ: |
| 2160 | case TCP_SEQ_STATE_LISTENING: |
| 2161 | rc = listening_get_next(seq, v); |
| 2162 | if (!rc) { |
Arnaldo Carvalho de Melo | f3f05f7 | 2005-08-09 20:08:09 -0700 | [diff] [blame] | 2163 | inet_listen_unlock(&tcp_hashinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2164 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
| 2165 | rc = established_get_first(seq); |
| 2166 | } |
| 2167 | break; |
| 2168 | case TCP_SEQ_STATE_ESTABLISHED: |
| 2169 | case TCP_SEQ_STATE_TIME_WAIT: |
| 2170 | rc = established_get_next(seq, v); |
| 2171 | break; |
| 2172 | } |
| 2173 | out: |
| 2174 | ++*pos; |
| 2175 | return rc; |
| 2176 | } |
| 2177 | |
| 2178 | static void tcp_seq_stop(struct seq_file *seq, void *v) |
| 2179 | { |
| 2180 | struct tcp_iter_state* st = seq->private; |
| 2181 | |
| 2182 | switch (st->state) { |
| 2183 | case TCP_SEQ_STATE_OPENREQ: |
| 2184 | if (v) { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2185 | struct inet_connection_sock *icsk = inet_csk(st->syn_wait_sk); |
| 2186 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2187 | } |
| 2188 | case TCP_SEQ_STATE_LISTENING: |
| 2189 | if (v != SEQ_START_TOKEN) |
Arnaldo Carvalho de Melo | f3f05f7 | 2005-08-09 20:08:09 -0700 | [diff] [blame] | 2190 | inet_listen_unlock(&tcp_hashinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | break; |
| 2192 | case TCP_SEQ_STATE_TIME_WAIT: |
| 2193 | case TCP_SEQ_STATE_ESTABLISHED: |
| 2194 | if (v) |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 2195 | read_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2196 | break; |
| 2197 | } |
| 2198 | } |
| 2199 | |
| 2200 | static int tcp_seq_open(struct inode *inode, struct file *file) |
| 2201 | { |
| 2202 | struct tcp_seq_afinfo *afinfo = PDE(inode)->data; |
| 2203 | struct seq_file *seq; |
| 2204 | struct tcp_iter_state *s; |
| 2205 | int rc; |
| 2206 | |
| 2207 | if (unlikely(afinfo == NULL)) |
| 2208 | return -EINVAL; |
| 2209 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 2210 | s = kzalloc(sizeof(*s), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2211 | if (!s) |
| 2212 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2213 | s->family = afinfo->family; |
| 2214 | s->seq_ops.start = tcp_seq_start; |
| 2215 | s->seq_ops.next = tcp_seq_next; |
| 2216 | s->seq_ops.show = afinfo->seq_show; |
| 2217 | s->seq_ops.stop = tcp_seq_stop; |
| 2218 | |
| 2219 | rc = seq_open(file, &s->seq_ops); |
| 2220 | if (rc) |
| 2221 | goto out_kfree; |
| 2222 | seq = file->private_data; |
| 2223 | seq->private = s; |
| 2224 | out: |
| 2225 | return rc; |
| 2226 | out_kfree: |
| 2227 | kfree(s); |
| 2228 | goto out; |
| 2229 | } |
| 2230 | |
| 2231 | int tcp_proc_register(struct tcp_seq_afinfo *afinfo) |
| 2232 | { |
| 2233 | int rc = 0; |
| 2234 | struct proc_dir_entry *p; |
| 2235 | |
| 2236 | if (!afinfo) |
| 2237 | return -EINVAL; |
| 2238 | afinfo->seq_fops->owner = afinfo->owner; |
| 2239 | afinfo->seq_fops->open = tcp_seq_open; |
| 2240 | afinfo->seq_fops->read = seq_read; |
| 2241 | afinfo->seq_fops->llseek = seq_lseek; |
| 2242 | afinfo->seq_fops->release = seq_release_private; |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 2243 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 2244 | p = proc_net_fops_create(&init_net, afinfo->name, S_IRUGO, afinfo->seq_fops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2245 | if (p) |
| 2246 | p->data = afinfo; |
| 2247 | else |
| 2248 | rc = -ENOMEM; |
| 2249 | return rc; |
| 2250 | } |
| 2251 | |
| 2252 | void tcp_proc_unregister(struct tcp_seq_afinfo *afinfo) |
| 2253 | { |
| 2254 | if (!afinfo) |
| 2255 | return; |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 2256 | proc_net_remove(&init_net, afinfo->name); |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 2257 | memset(afinfo->seq_fops, 0, sizeof(*afinfo->seq_fops)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2258 | } |
| 2259 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 2260 | static void get_openreq4(struct sock *sk, struct request_sock *req, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | char *tmpbuf, int i, int uid) |
| 2262 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2263 | const struct inet_request_sock *ireq = inet_rsk(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2264 | int ttd = req->expires - jiffies; |
| 2265 | |
| 2266 | sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X" |
| 2267 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %u %d %p", |
| 2268 | i, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2269 | ireq->loc_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2270 | ntohs(inet_sk(sk)->sport), |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2271 | ireq->rmt_addr, |
| 2272 | ntohs(ireq->rmt_port), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2273 | TCP_SYN_RECV, |
| 2274 | 0, 0, /* could print option size, but that is af dependent. */ |
| 2275 | 1, /* timers active (only the expire timer) */ |
| 2276 | jiffies_to_clock_t(ttd), |
| 2277 | req->retrans, |
| 2278 | uid, |
| 2279 | 0, /* non standard timer */ |
| 2280 | 0, /* open_requests have no inode */ |
| 2281 | atomic_read(&sk->sk_refcnt), |
| 2282 | req); |
| 2283 | } |
| 2284 | |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2285 | static void get_tcp4_sock(struct sock *sk, char *tmpbuf, int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2286 | { |
| 2287 | int timer_active; |
| 2288 | unsigned long timer_expires; |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2289 | struct tcp_sock *tp = tcp_sk(sk); |
| 2290 | const struct inet_connection_sock *icsk = inet_csk(sk); |
| 2291 | struct inet_sock *inet = inet_sk(sk); |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 2292 | __be32 dest = inet->daddr; |
| 2293 | __be32 src = inet->rcv_saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2294 | __u16 destp = ntohs(inet->dport); |
| 2295 | __u16 srcp = ntohs(inet->sport); |
| 2296 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2297 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2298 | timer_active = 1; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2299 | timer_expires = icsk->icsk_timeout; |
| 2300 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2301 | timer_active = 4; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2302 | timer_expires = icsk->icsk_timeout; |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2303 | } else if (timer_pending(&sk->sk_timer)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2304 | timer_active = 2; |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2305 | timer_expires = sk->sk_timer.expires; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2306 | } else { |
| 2307 | timer_active = 0; |
| 2308 | timer_expires = jiffies; |
| 2309 | } |
| 2310 | |
| 2311 | sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X %02X %08X:%08X %02X:%08lX " |
| 2312 | "%08X %5d %8d %lu %d %p %u %u %u %u %d", |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2313 | i, src, srcp, dest, destp, sk->sk_state, |
Sridhar Samudrala | 47da8ee | 2006-06-27 13:29:00 -0700 | [diff] [blame] | 2314 | tp->write_seq - tp->snd_una, |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2315 | sk->sk_state == TCP_LISTEN ? sk->sk_ack_backlog : |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 2316 | (tp->rcv_nxt - tp->copied_seq), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2317 | timer_active, |
| 2318 | jiffies_to_clock_t(timer_expires - jiffies), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2319 | icsk->icsk_retransmits, |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2320 | sock_i_uid(sk), |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2321 | icsk->icsk_probes_out, |
Ilpo Järvinen | cf4c6bf | 2007-02-22 01:13:58 -0800 | [diff] [blame] | 2322 | sock_i_ino(sk), |
| 2323 | atomic_read(&sk->sk_refcnt), sk, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2324 | icsk->icsk_rto, |
| 2325 | icsk->icsk_ack.ato, |
| 2326 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2327 | tp->snd_cwnd, |
| 2328 | tp->snd_ssthresh >= 0xFFFF ? -1 : tp->snd_ssthresh); |
| 2329 | } |
| 2330 | |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 2331 | static void get_timewait4_sock(struct inet_timewait_sock *tw, |
| 2332 | char *tmpbuf, int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2333 | { |
Al Viro | 23f33c2 | 2006-09-27 18:43:50 -0700 | [diff] [blame] | 2334 | __be32 dest, src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2335 | __u16 destp, srcp; |
| 2336 | int ttd = tw->tw_ttd - jiffies; |
| 2337 | |
| 2338 | if (ttd < 0) |
| 2339 | ttd = 0; |
| 2340 | |
| 2341 | dest = tw->tw_daddr; |
| 2342 | src = tw->tw_rcv_saddr; |
| 2343 | destp = ntohs(tw->tw_dport); |
| 2344 | srcp = ntohs(tw->tw_sport); |
| 2345 | |
| 2346 | sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X" |
| 2347 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p", |
| 2348 | i, src, srcp, dest, destp, tw->tw_substate, 0, 0, |
| 2349 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, |
| 2350 | atomic_read(&tw->tw_refcnt), tw); |
| 2351 | } |
| 2352 | |
| 2353 | #define TMPSZ 150 |
| 2354 | |
| 2355 | static int tcp4_seq_show(struct seq_file *seq, void *v) |
| 2356 | { |
| 2357 | struct tcp_iter_state* st; |
| 2358 | char tmpbuf[TMPSZ + 1]; |
| 2359 | |
| 2360 | if (v == SEQ_START_TOKEN) { |
| 2361 | seq_printf(seq, "%-*s\n", TMPSZ - 1, |
| 2362 | " sl local_address rem_address st tx_queue " |
| 2363 | "rx_queue tr tm->when retrnsmt uid timeout " |
| 2364 | "inode"); |
| 2365 | goto out; |
| 2366 | } |
| 2367 | st = seq->private; |
| 2368 | |
| 2369 | switch (st->state) { |
| 2370 | case TCP_SEQ_STATE_LISTENING: |
| 2371 | case TCP_SEQ_STATE_ESTABLISHED: |
| 2372 | get_tcp4_sock(v, tmpbuf, st->num); |
| 2373 | break; |
| 2374 | case TCP_SEQ_STATE_OPENREQ: |
| 2375 | get_openreq4(st->syn_wait_sk, v, tmpbuf, st->num, st->uid); |
| 2376 | break; |
| 2377 | case TCP_SEQ_STATE_TIME_WAIT: |
| 2378 | get_timewait4_sock(v, tmpbuf, st->num); |
| 2379 | break; |
| 2380 | } |
| 2381 | seq_printf(seq, "%-*s\n", TMPSZ - 1, tmpbuf); |
| 2382 | out: |
| 2383 | return 0; |
| 2384 | } |
| 2385 | |
| 2386 | static struct file_operations tcp4_seq_fops; |
| 2387 | static struct tcp_seq_afinfo tcp4_seq_afinfo = { |
| 2388 | .owner = THIS_MODULE, |
| 2389 | .name = "tcp", |
| 2390 | .family = AF_INET, |
| 2391 | .seq_show = tcp4_seq_show, |
| 2392 | .seq_fops = &tcp4_seq_fops, |
| 2393 | }; |
| 2394 | |
| 2395 | int __init tcp4_proc_init(void) |
| 2396 | { |
| 2397 | return tcp_proc_register(&tcp4_seq_afinfo); |
| 2398 | } |
| 2399 | |
| 2400 | void tcp4_proc_exit(void) |
| 2401 | { |
| 2402 | tcp_proc_unregister(&tcp4_seq_afinfo); |
| 2403 | } |
| 2404 | #endif /* CONFIG_PROC_FS */ |
| 2405 | |
Eric Dumazet | 47a31a6 | 2007-11-05 23:39:16 -0800 | [diff] [blame] | 2406 | DEFINE_PROTO_INUSE(tcp) |
| 2407 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2408 | struct proto tcp_prot = { |
| 2409 | .name = "TCP", |
| 2410 | .owner = THIS_MODULE, |
| 2411 | .close = tcp_close, |
| 2412 | .connect = tcp_v4_connect, |
| 2413 | .disconnect = tcp_disconnect, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2414 | .accept = inet_csk_accept, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2415 | .ioctl = tcp_ioctl, |
| 2416 | .init = tcp_v4_init_sock, |
| 2417 | .destroy = tcp_v4_destroy_sock, |
| 2418 | .shutdown = tcp_shutdown, |
| 2419 | .setsockopt = tcp_setsockopt, |
| 2420 | .getsockopt = tcp_getsockopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2421 | .recvmsg = tcp_recvmsg, |
| 2422 | .backlog_rcv = tcp_v4_do_rcv, |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 2423 | .hash = inet_hash, |
| 2424 | .unhash = inet_unhash, |
| 2425 | .get_port = inet_csk_get_port, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2426 | .enter_memory_pressure = tcp_enter_memory_pressure, |
| 2427 | .sockets_allocated = &tcp_sockets_allocated, |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 2428 | .orphan_count = &tcp_orphan_count, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | .memory_allocated = &tcp_memory_allocated, |
| 2430 | .memory_pressure = &tcp_memory_pressure, |
| 2431 | .sysctl_mem = sysctl_tcp_mem, |
| 2432 | .sysctl_wmem = sysctl_tcp_wmem, |
| 2433 | .sysctl_rmem = sysctl_tcp_rmem, |
| 2434 | .max_header = MAX_TCP_HEADER, |
| 2435 | .obj_size = sizeof(struct tcp_sock), |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2436 | .twsk_prot = &tcp_timewait_sock_ops, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 2437 | .rsk_prot = &tcp_request_sock_ops, |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 2438 | .hashinfo = &tcp_hashinfo, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2439 | #ifdef CONFIG_COMPAT |
| 2440 | .compat_setsockopt = compat_tcp_setsockopt, |
| 2441 | .compat_getsockopt = compat_tcp_getsockopt, |
| 2442 | #endif |
Eric Dumazet | 47a31a6 | 2007-11-05 23:39:16 -0800 | [diff] [blame] | 2443 | REF_PROTO_INUSE(tcp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2444 | }; |
| 2445 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2446 | void __init tcp_v4_init(struct net_proto_family *ops) |
| 2447 | { |
Arnaldo Carvalho de Melo | 7174259 | 2006-11-17 10:57:30 -0200 | [diff] [blame] | 2448 | if (inet_csk_ctl_sock_create(&tcp_socket, PF_INET, SOCK_RAW, |
| 2449 | IPPROTO_TCP) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2450 | panic("Failed to create the TCP control socket.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2451 | } |
| 2452 | |
| 2453 | EXPORT_SYMBOL(ipv4_specific); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2454 | EXPORT_SYMBOL(tcp_hashinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2455 | EXPORT_SYMBOL(tcp_prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2456 | EXPORT_SYMBOL(tcp_v4_conn_request); |
| 2457 | EXPORT_SYMBOL(tcp_v4_connect); |
| 2458 | EXPORT_SYMBOL(tcp_v4_do_rcv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2459 | EXPORT_SYMBOL(tcp_v4_remember_stamp); |
| 2460 | EXPORT_SYMBOL(tcp_v4_send_check); |
| 2461 | EXPORT_SYMBOL(tcp_v4_syn_recv_sock); |
| 2462 | |
| 2463 | #ifdef CONFIG_PROC_FS |
| 2464 | EXPORT_SYMBOL(tcp_proc_register); |
| 2465 | EXPORT_SYMBOL(tcp_proc_unregister); |
| 2466 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2467 | EXPORT_SYMBOL(sysctl_tcp_low_latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2468 | |