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Commit | Line | Data |
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1da177e4 LT |
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 | |
60236fdd | 39 | * request_sock handling and moved |
1da177e4 LT |
40 | * most of it into the af independent code. |
41 | * Added tail drop and some other bugfixes. | |
caa20d9a | 42 | * Added new listen semantics. |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
65 | #include <net/icmp.h> | |
304a1618 | 66 | #include <net/inet_hashtables.h> |
1da177e4 | 67 | #include <net/tcp.h> |
20380731 | 68 | #include <net/transp_v6.h> |
1da177e4 LT |
69 | #include <net/ipv6.h> |
70 | #include <net/inet_common.h> | |
6d6ee43e | 71 | #include <net/timewait_sock.h> |
1da177e4 | 72 | #include <net/xfrm.h> |
1a2449a8 | 73 | #include <net/netdma.h> |
1da177e4 LT |
74 | |
75 | #include <linux/inet.h> | |
76 | #include <linux/ipv6.h> | |
77 | #include <linux/stddef.h> | |
78 | #include <linux/proc_fs.h> | |
79 | #include <linux/seq_file.h> | |
80 | ||
cfb6eeb4 YH |
81 | #include <linux/crypto.h> |
82 | #include <linux/scatterlist.h> | |
83 | ||
ab32ea5d BH |
84 | int sysctl_tcp_tw_reuse __read_mostly; |
85 | int sysctl_tcp_low_latency __read_mostly; | |
1da177e4 LT |
86 | |
87 | /* Check TCP sequence numbers in ICMP packets. */ | |
88 | #define ICMP_MIN_LENGTH 8 | |
89 | ||
90 | /* Socket used for sending RSTs */ | |
91 | static struct socket *tcp_socket; | |
92 | ||
8292a17a | 93 | void tcp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb); |
1da177e4 | 94 | |
cfb6eeb4 | 95 | #ifdef CONFIG_TCP_MD5SIG |
7174259e ACM |
96 | static struct tcp_md5sig_key *tcp_v4_md5_do_lookup(struct sock *sk, |
97 | __be32 addr); | |
cfb6eeb4 | 98 | static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, |
7174259e ACM |
99 | __be32 saddr, __be32 daddr, |
100 | struct tcphdr *th, int protocol, | |
101 | int tcplen); | |
cfb6eeb4 YH |
102 | #endif |
103 | ||
0f7ff927 | 104 | struct inet_hashinfo __cacheline_aligned tcp_hashinfo = { |
7174259e ACM |
105 | .lhash_lock = __RW_LOCK_UNLOCKED(tcp_hashinfo.lhash_lock), |
106 | .lhash_users = ATOMIC_INIT(0), | |
107 | .lhash_wait = __WAIT_QUEUE_HEAD_INITIALIZER(tcp_hashinfo.lhash_wait), | |
1da177e4 LT |
108 | }; |
109 | ||
463c84b9 ACM |
110 | static int tcp_v4_get_port(struct sock *sk, unsigned short snum) |
111 | { | |
971af18b ACM |
112 | return inet_csk_get_port(&tcp_hashinfo, sk, snum, |
113 | inet_csk_bind_conflict); | |
463c84b9 ACM |
114 | } |
115 | ||
1da177e4 LT |
116 | static void tcp_v4_hash(struct sock *sk) |
117 | { | |
81849d10 | 118 | inet_hash(&tcp_hashinfo, sk); |
1da177e4 LT |
119 | } |
120 | ||
121 | void tcp_unhash(struct sock *sk) | |
122 | { | |
81849d10 | 123 | inet_unhash(&tcp_hashinfo, sk); |
1da177e4 LT |
124 | } |
125 | ||
a94f723d | 126 | static inline __u32 tcp_v4_init_sequence(struct sk_buff *skb) |
1da177e4 LT |
127 | { |
128 | return secure_tcp_sequence_number(skb->nh.iph->daddr, | |
129 | skb->nh.iph->saddr, | |
130 | skb->h.th->dest, | |
131 | skb->h.th->source); | |
132 | } | |
133 | ||
6d6ee43e ACM |
134 | int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp) |
135 | { | |
136 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sktw); | |
137 | struct tcp_sock *tp = tcp_sk(sk); | |
138 | ||
139 | /* With PAWS, it is safe from the viewpoint | |
140 | of data integrity. Even without PAWS it is safe provided sequence | |
141 | spaces do not overlap i.e. at data rates <= 80Mbit/sec. | |
142 | ||
143 | Actually, the idea is close to VJ's one, only timestamp cache is | |
144 | held not per host, but per port pair and TW bucket is used as state | |
145 | holder. | |
146 | ||
147 | If TW bucket has been already destroyed we fall back to VJ's scheme | |
148 | and use initial timestamp retrieved from peer table. | |
149 | */ | |
150 | if (tcptw->tw_ts_recent_stamp && | |
151 | (twp == NULL || (sysctl_tcp_tw_reuse && | |
152 | xtime.tv_sec - tcptw->tw_ts_recent_stamp > 1))) { | |
153 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; | |
154 | if (tp->write_seq == 0) | |
155 | tp->write_seq = 1; | |
156 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; | |
157 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; | |
158 | sock_hold(sktw); | |
159 | return 1; | |
160 | } | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | EXPORT_SYMBOL_GPL(tcp_twsk_unique); | |
166 | ||
1da177e4 LT |
167 | /* This will initiate an outgoing connection. */ |
168 | int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
169 | { | |
170 | struct inet_sock *inet = inet_sk(sk); | |
171 | struct tcp_sock *tp = tcp_sk(sk); | |
172 | struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; | |
173 | struct rtable *rt; | |
bada8adc | 174 | __be32 daddr, nexthop; |
1da177e4 LT |
175 | int tmp; |
176 | int err; | |
177 | ||
178 | if (addr_len < sizeof(struct sockaddr_in)) | |
179 | return -EINVAL; | |
180 | ||
181 | if (usin->sin_family != AF_INET) | |
182 | return -EAFNOSUPPORT; | |
183 | ||
184 | nexthop = daddr = usin->sin_addr.s_addr; | |
185 | if (inet->opt && inet->opt->srr) { | |
186 | if (!daddr) | |
187 | return -EINVAL; | |
188 | nexthop = inet->opt->faddr; | |
189 | } | |
190 | ||
191 | tmp = ip_route_connect(&rt, nexthop, inet->saddr, | |
192 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, | |
193 | IPPROTO_TCP, | |
194 | inet->sport, usin->sin_port, sk); | |
195 | if (tmp < 0) | |
196 | return tmp; | |
197 | ||
198 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { | |
199 | ip_rt_put(rt); | |
200 | return -ENETUNREACH; | |
201 | } | |
202 | ||
203 | if (!inet->opt || !inet->opt->srr) | |
204 | daddr = rt->rt_dst; | |
205 | ||
206 | if (!inet->saddr) | |
207 | inet->saddr = rt->rt_src; | |
208 | inet->rcv_saddr = inet->saddr; | |
209 | ||
210 | if (tp->rx_opt.ts_recent_stamp && inet->daddr != daddr) { | |
211 | /* Reset inherited state */ | |
212 | tp->rx_opt.ts_recent = 0; | |
213 | tp->rx_opt.ts_recent_stamp = 0; | |
214 | tp->write_seq = 0; | |
215 | } | |
216 | ||
295ff7ed | 217 | if (tcp_death_row.sysctl_tw_recycle && |
1da177e4 LT |
218 | !tp->rx_opt.ts_recent_stamp && rt->rt_dst == daddr) { |
219 | struct inet_peer *peer = rt_get_peer(rt); | |
7174259e ACM |
220 | /* |
221 | * VJ's idea. We save last timestamp seen from | |
222 | * the destination in peer table, when entering state | |
223 | * TIME-WAIT * and initialize rx_opt.ts_recent from it, | |
224 | * when trying new connection. | |
1da177e4 | 225 | */ |
7174259e ACM |
226 | if (peer != NULL && |
227 | peer->tcp_ts_stamp + TCP_PAWS_MSL >= xtime.tv_sec) { | |
1da177e4 LT |
228 | tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp; |
229 | tp->rx_opt.ts_recent = peer->tcp_ts; | |
230 | } | |
231 | } | |
232 | ||
233 | inet->dport = usin->sin_port; | |
234 | inet->daddr = daddr; | |
235 | ||
d83d8461 | 236 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
1da177e4 | 237 | if (inet->opt) |
d83d8461 | 238 | inet_csk(sk)->icsk_ext_hdr_len = inet->opt->optlen; |
1da177e4 LT |
239 | |
240 | tp->rx_opt.mss_clamp = 536; | |
241 | ||
242 | /* Socket identity is still unknown (sport may be zero). | |
243 | * However we set state to SYN-SENT and not releasing socket | |
244 | * lock select source port, enter ourselves into the hash tables and | |
245 | * complete initialization after this. | |
246 | */ | |
247 | tcp_set_state(sk, TCP_SYN_SENT); | |
a7f5e7f1 | 248 | err = inet_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
249 | if (err) |
250 | goto failure; | |
251 | ||
7174259e ACM |
252 | err = ip_route_newports(&rt, IPPROTO_TCP, |
253 | inet->sport, inet->dport, sk); | |
1da177e4 LT |
254 | if (err) |
255 | goto failure; | |
256 | ||
257 | /* OK, now commit destination to socket. */ | |
bcd76111 | 258 | sk->sk_gso_type = SKB_GSO_TCPV4; |
6cbb0df7 | 259 | sk_setup_caps(sk, &rt->u.dst); |
1da177e4 LT |
260 | |
261 | if (!tp->write_seq) | |
262 | tp->write_seq = secure_tcp_sequence_number(inet->saddr, | |
263 | inet->daddr, | |
264 | inet->sport, | |
265 | usin->sin_port); | |
266 | ||
267 | inet->id = tp->write_seq ^ jiffies; | |
268 | ||
269 | err = tcp_connect(sk); | |
270 | rt = NULL; | |
271 | if (err) | |
272 | goto failure; | |
273 | ||
274 | return 0; | |
275 | ||
276 | failure: | |
7174259e ACM |
277 | /* |
278 | * This unhashes the socket and releases the local port, | |
279 | * if necessary. | |
280 | */ | |
1da177e4 LT |
281 | tcp_set_state(sk, TCP_CLOSE); |
282 | ip_rt_put(rt); | |
283 | sk->sk_route_caps = 0; | |
284 | inet->dport = 0; | |
285 | return err; | |
286 | } | |
287 | ||
1da177e4 LT |
288 | /* |
289 | * This routine does path mtu discovery as defined in RFC1191. | |
290 | */ | |
40efc6fa | 291 | static void do_pmtu_discovery(struct sock *sk, struct iphdr *iph, u32 mtu) |
1da177e4 LT |
292 | { |
293 | struct dst_entry *dst; | |
294 | struct inet_sock *inet = inet_sk(sk); | |
1da177e4 LT |
295 | |
296 | /* We are not interested in TCP_LISTEN and open_requests (SYN-ACKs | |
297 | * send out by Linux are always <576bytes so they should go through | |
298 | * unfragmented). | |
299 | */ | |
300 | if (sk->sk_state == TCP_LISTEN) | |
301 | return; | |
302 | ||
303 | /* We don't check in the destentry if pmtu discovery is forbidden | |
304 | * on this route. We just assume that no packet_to_big packets | |
305 | * are send back when pmtu discovery is not active. | |
306 | * There is a small race when the user changes this flag in the | |
307 | * route, but I think that's acceptable. | |
308 | */ | |
309 | if ((dst = __sk_dst_check(sk, 0)) == NULL) | |
310 | return; | |
311 | ||
312 | dst->ops->update_pmtu(dst, mtu); | |
313 | ||
314 | /* Something is about to be wrong... Remember soft error | |
315 | * for the case, if this connection will not able to recover. | |
316 | */ | |
317 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) | |
318 | sk->sk_err_soft = EMSGSIZE; | |
319 | ||
320 | mtu = dst_mtu(dst); | |
321 | ||
322 | if (inet->pmtudisc != IP_PMTUDISC_DONT && | |
d83d8461 | 323 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
1da177e4 LT |
324 | tcp_sync_mss(sk, mtu); |
325 | ||
326 | /* Resend the TCP packet because it's | |
327 | * clear that the old packet has been | |
328 | * dropped. This is the new "fast" path mtu | |
329 | * discovery. | |
330 | */ | |
331 | tcp_simple_retransmit(sk); | |
332 | } /* else let the usual retransmit timer handle it */ | |
333 | } | |
334 | ||
335 | /* | |
336 | * This routine is called by the ICMP module when it gets some | |
337 | * sort of error condition. If err < 0 then the socket should | |
338 | * be closed and the error returned to the user. If err > 0 | |
339 | * it's just the icmp type << 8 | icmp code. After adjustment | |
340 | * header points to the first 8 bytes of the tcp header. We need | |
341 | * to find the appropriate port. | |
342 | * | |
343 | * The locking strategy used here is very "optimistic". When | |
344 | * someone else accesses the socket the ICMP is just dropped | |
345 | * and for some paths there is no check at all. | |
346 | * A more general error queue to queue errors for later handling | |
347 | * is probably better. | |
348 | * | |
349 | */ | |
350 | ||
351 | void tcp_v4_err(struct sk_buff *skb, u32 info) | |
352 | { | |
353 | struct iphdr *iph = (struct iphdr *)skb->data; | |
354 | struct tcphdr *th = (struct tcphdr *)(skb->data + (iph->ihl << 2)); | |
355 | struct tcp_sock *tp; | |
356 | struct inet_sock *inet; | |
357 | int type = skb->h.icmph->type; | |
358 | int code = skb->h.icmph->code; | |
359 | struct sock *sk; | |
360 | __u32 seq; | |
361 | int err; | |
362 | ||
363 | if (skb->len < (iph->ihl << 2) + 8) { | |
364 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
365 | return; | |
366 | } | |
367 | ||
e48c414e | 368 | sk = inet_lookup(&tcp_hashinfo, iph->daddr, th->dest, iph->saddr, |
463c84b9 | 369 | th->source, inet_iif(skb)); |
1da177e4 LT |
370 | if (!sk) { |
371 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
372 | return; | |
373 | } | |
374 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 375 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
376 | return; |
377 | } | |
378 | ||
379 | bh_lock_sock(sk); | |
380 | /* If too many ICMPs get dropped on busy | |
381 | * servers this needs to be solved differently. | |
382 | */ | |
383 | if (sock_owned_by_user(sk)) | |
384 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
385 | ||
386 | if (sk->sk_state == TCP_CLOSE) | |
387 | goto out; | |
388 | ||
389 | tp = tcp_sk(sk); | |
390 | seq = ntohl(th->seq); | |
391 | if (sk->sk_state != TCP_LISTEN && | |
392 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
06ca719f | 393 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
394 | goto out; |
395 | } | |
396 | ||
397 | switch (type) { | |
398 | case ICMP_SOURCE_QUENCH: | |
399 | /* Just silently ignore these. */ | |
400 | goto out; | |
401 | case ICMP_PARAMETERPROB: | |
402 | err = EPROTO; | |
403 | break; | |
404 | case ICMP_DEST_UNREACH: | |
405 | if (code > NR_ICMP_UNREACH) | |
406 | goto out; | |
407 | ||
408 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ | |
409 | if (!sock_owned_by_user(sk)) | |
410 | do_pmtu_discovery(sk, iph, info); | |
411 | goto out; | |
412 | } | |
413 | ||
414 | err = icmp_err_convert[code].errno; | |
415 | break; | |
416 | case ICMP_TIME_EXCEEDED: | |
417 | err = EHOSTUNREACH; | |
418 | break; | |
419 | default: | |
420 | goto out; | |
421 | } | |
422 | ||
423 | switch (sk->sk_state) { | |
60236fdd | 424 | struct request_sock *req, **prev; |
1da177e4 LT |
425 | case TCP_LISTEN: |
426 | if (sock_owned_by_user(sk)) | |
427 | goto out; | |
428 | ||
463c84b9 ACM |
429 | req = inet_csk_search_req(sk, &prev, th->dest, |
430 | iph->daddr, iph->saddr); | |
1da177e4 LT |
431 | if (!req) |
432 | goto out; | |
433 | ||
434 | /* ICMPs are not backlogged, hence we cannot get | |
435 | an established socket here. | |
436 | */ | |
437 | BUG_TRAP(!req->sk); | |
438 | ||
2e6599cb | 439 | if (seq != tcp_rsk(req)->snt_isn) { |
1da177e4 LT |
440 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
441 | goto out; | |
442 | } | |
443 | ||
444 | /* | |
445 | * Still in SYN_RECV, just remove it silently. | |
446 | * There is no good way to pass the error to the newly | |
447 | * created socket, and POSIX does not want network | |
448 | * errors returned from accept(). | |
449 | */ | |
463c84b9 | 450 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
451 | goto out; |
452 | ||
453 | case TCP_SYN_SENT: | |
454 | case TCP_SYN_RECV: /* Cannot happen. | |
455 | It can f.e. if SYNs crossed. | |
456 | */ | |
457 | if (!sock_owned_by_user(sk)) { | |
1da177e4 LT |
458 | sk->sk_err = err; |
459 | ||
460 | sk->sk_error_report(sk); | |
461 | ||
462 | tcp_done(sk); | |
463 | } else { | |
464 | sk->sk_err_soft = err; | |
465 | } | |
466 | goto out; | |
467 | } | |
468 | ||
469 | /* If we've already connected we will keep trying | |
470 | * until we time out, or the user gives up. | |
471 | * | |
472 | * rfc1122 4.2.3.9 allows to consider as hard errors | |
473 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, | |
474 | * but it is obsoleted by pmtu discovery). | |
475 | * | |
476 | * Note, that in modern internet, where routing is unreliable | |
477 | * and in each dark corner broken firewalls sit, sending random | |
478 | * errors ordered by their masters even this two messages finally lose | |
479 | * their original sense (even Linux sends invalid PORT_UNREACHs) | |
480 | * | |
481 | * Now we are in compliance with RFCs. | |
482 | * --ANK (980905) | |
483 | */ | |
484 | ||
485 | inet = inet_sk(sk); | |
486 | if (!sock_owned_by_user(sk) && inet->recverr) { | |
487 | sk->sk_err = err; | |
488 | sk->sk_error_report(sk); | |
489 | } else { /* Only an error on timeout */ | |
490 | sk->sk_err_soft = err; | |
491 | } | |
492 | ||
493 | out: | |
494 | bh_unlock_sock(sk); | |
495 | sock_put(sk); | |
496 | } | |
497 | ||
498 | /* This routine computes an IPv4 TCP checksum. */ | |
8292a17a | 499 | void tcp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb) |
1da177e4 LT |
500 | { |
501 | struct inet_sock *inet = inet_sk(sk); | |
8292a17a | 502 | struct tcphdr *th = skb->h.th; |
1da177e4 | 503 | |
84fa7933 | 504 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
ba7808ea FD |
505 | th->check = ~tcp_v4_check(len, inet->saddr, |
506 | inet->daddr, 0); | |
ff1dcadb | 507 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 508 | } else { |
ba7808ea | 509 | th->check = tcp_v4_check(len, inet->saddr, inet->daddr, |
1da177e4 LT |
510 | csum_partial((char *)th, |
511 | th->doff << 2, | |
512 | skb->csum)); | |
513 | } | |
514 | } | |
515 | ||
a430a43d HX |
516 | int tcp_v4_gso_send_check(struct sk_buff *skb) |
517 | { | |
518 | struct iphdr *iph; | |
519 | struct tcphdr *th; | |
520 | ||
521 | if (!pskb_may_pull(skb, sizeof(*th))) | |
522 | return -EINVAL; | |
523 | ||
524 | iph = skb->nh.iph; | |
525 | th = skb->h.th; | |
526 | ||
527 | th->check = 0; | |
ba7808ea | 528 | th->check = ~tcp_v4_check(skb->len, iph->saddr, iph->daddr, 0); |
ff1dcadb | 529 | skb->csum_offset = offsetof(struct tcphdr, check); |
84fa7933 | 530 | skb->ip_summed = CHECKSUM_PARTIAL; |
a430a43d HX |
531 | return 0; |
532 | } | |
533 | ||
1da177e4 LT |
534 | /* |
535 | * This routine will send an RST to the other tcp. | |
536 | * | |
537 | * Someone asks: why I NEVER use socket parameters (TOS, TTL etc.) | |
538 | * for reset. | |
539 | * Answer: if a packet caused RST, it is not for a socket | |
540 | * existing in our system, if it is matched to a socket, | |
541 | * it is just duplicate segment or bug in other side's TCP. | |
542 | * So that we build reply only basing on parameters | |
543 | * arrived with segment. | |
544 | * Exception: precedence violation. We do not implement it in any case. | |
545 | */ | |
546 | ||
cfb6eeb4 | 547 | static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
548 | { |
549 | struct tcphdr *th = skb->h.th; | |
cfb6eeb4 YH |
550 | struct { |
551 | struct tcphdr th; | |
552 | #ifdef CONFIG_TCP_MD5SIG | |
714e85be | 553 | __be32 opt[(TCPOLEN_MD5SIG_ALIGNED >> 2)]; |
cfb6eeb4 YH |
554 | #endif |
555 | } rep; | |
1da177e4 | 556 | struct ip_reply_arg arg; |
cfb6eeb4 YH |
557 | #ifdef CONFIG_TCP_MD5SIG |
558 | struct tcp_md5sig_key *key; | |
559 | #endif | |
1da177e4 LT |
560 | |
561 | /* Never send a reset in response to a reset. */ | |
562 | if (th->rst) | |
563 | return; | |
564 | ||
565 | if (((struct rtable *)skb->dst)->rt_type != RTN_LOCAL) | |
566 | return; | |
567 | ||
568 | /* Swap the send and the receive. */ | |
cfb6eeb4 YH |
569 | memset(&rep, 0, sizeof(rep)); |
570 | rep.th.dest = th->source; | |
571 | rep.th.source = th->dest; | |
572 | rep.th.doff = sizeof(struct tcphdr) / 4; | |
573 | rep.th.rst = 1; | |
1da177e4 LT |
574 | |
575 | if (th->ack) { | |
cfb6eeb4 | 576 | rep.th.seq = th->ack_seq; |
1da177e4 | 577 | } else { |
cfb6eeb4 YH |
578 | rep.th.ack = 1; |
579 | rep.th.ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin + | |
580 | skb->len - (th->doff << 2)); | |
1da177e4 LT |
581 | } |
582 | ||
7174259e | 583 | memset(&arg, 0, sizeof(arg)); |
cfb6eeb4 YH |
584 | arg.iov[0].iov_base = (unsigned char *)&rep; |
585 | arg.iov[0].iov_len = sizeof(rep.th); | |
586 | ||
587 | #ifdef CONFIG_TCP_MD5SIG | |
588 | key = sk ? tcp_v4_md5_do_lookup(sk, skb->nh.iph->daddr) : NULL; | |
589 | if (key) { | |
590 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | | |
591 | (TCPOPT_NOP << 16) | | |
592 | (TCPOPT_MD5SIG << 8) | | |
593 | TCPOLEN_MD5SIG); | |
594 | /* Update length and the length the header thinks exists */ | |
595 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; | |
596 | rep.th.doff = arg.iov[0].iov_len / 4; | |
597 | ||
598 | tcp_v4_do_calc_md5_hash((__u8 *)&rep.opt[1], | |
599 | key, | |
600 | skb->nh.iph->daddr, | |
601 | skb->nh.iph->saddr, | |
602 | &rep.th, IPPROTO_TCP, | |
603 | arg.iov[0].iov_len); | |
604 | } | |
605 | #endif | |
1da177e4 | 606 | arg.csum = csum_tcpudp_nofold(skb->nh.iph->daddr, |
7174259e | 607 | skb->nh.iph->saddr, /* XXX */ |
1da177e4 LT |
608 | sizeof(struct tcphdr), IPPROTO_TCP, 0); |
609 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; | |
610 | ||
cfb6eeb4 | 611 | ip_send_reply(tcp_socket->sk, skb, &arg, arg.iov[0].iov_len); |
1da177e4 LT |
612 | |
613 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
614 | TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); | |
615 | } | |
616 | ||
617 | /* The code following below sending ACKs in SYN-RECV and TIME-WAIT states | |
618 | outside socket context is ugly, certainly. What can I do? | |
619 | */ | |
620 | ||
cfb6eeb4 YH |
621 | static void tcp_v4_send_ack(struct tcp_timewait_sock *twsk, |
622 | struct sk_buff *skb, u32 seq, u32 ack, | |
1da177e4 LT |
623 | u32 win, u32 ts) |
624 | { | |
625 | struct tcphdr *th = skb->h.th; | |
626 | struct { | |
627 | struct tcphdr th; | |
714e85be | 628 | __be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2) |
cfb6eeb4 | 629 | #ifdef CONFIG_TCP_MD5SIG |
714e85be | 630 | + (TCPOLEN_MD5SIG_ALIGNED >> 2) |
cfb6eeb4 YH |
631 | #endif |
632 | ]; | |
1da177e4 LT |
633 | } rep; |
634 | struct ip_reply_arg arg; | |
cfb6eeb4 YH |
635 | #ifdef CONFIG_TCP_MD5SIG |
636 | struct tcp_md5sig_key *key; | |
637 | struct tcp_md5sig_key tw_key; | |
638 | #endif | |
1da177e4 LT |
639 | |
640 | memset(&rep.th, 0, sizeof(struct tcphdr)); | |
7174259e | 641 | memset(&arg, 0, sizeof(arg)); |
1da177e4 LT |
642 | |
643 | arg.iov[0].iov_base = (unsigned char *)&rep; | |
644 | arg.iov[0].iov_len = sizeof(rep.th); | |
645 | if (ts) { | |
cfb6eeb4 YH |
646 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
647 | (TCPOPT_TIMESTAMP << 8) | | |
648 | TCPOLEN_TIMESTAMP); | |
649 | rep.opt[1] = htonl(tcp_time_stamp); | |
650 | rep.opt[2] = htonl(ts); | |
cb48cfe8 | 651 | arg.iov[0].iov_len += TCPOLEN_TSTAMP_ALIGNED; |
1da177e4 LT |
652 | } |
653 | ||
654 | /* Swap the send and the receive. */ | |
655 | rep.th.dest = th->source; | |
656 | rep.th.source = th->dest; | |
657 | rep.th.doff = arg.iov[0].iov_len / 4; | |
658 | rep.th.seq = htonl(seq); | |
659 | rep.th.ack_seq = htonl(ack); | |
660 | rep.th.ack = 1; | |
661 | rep.th.window = htons(win); | |
662 | ||
cfb6eeb4 YH |
663 | #ifdef CONFIG_TCP_MD5SIG |
664 | /* | |
665 | * The SKB holds an imcoming packet, but may not have a valid ->sk | |
666 | * pointer. This is especially the case when we're dealing with a | |
667 | * TIME_WAIT ack, because the sk structure is long gone, and only | |
668 | * the tcp_timewait_sock remains. So the md5 key is stashed in that | |
669 | * structure, and we use it in preference. I believe that (twsk || | |
670 | * skb->sk) holds true, but we program defensively. | |
671 | */ | |
672 | if (!twsk && skb->sk) { | |
673 | key = tcp_v4_md5_do_lookup(skb->sk, skb->nh.iph->daddr); | |
674 | } else if (twsk && twsk->tw_md5_keylen) { | |
675 | tw_key.key = twsk->tw_md5_key; | |
676 | tw_key.keylen = twsk->tw_md5_keylen; | |
677 | key = &tw_key; | |
7174259e | 678 | } else |
cfb6eeb4 | 679 | key = NULL; |
cfb6eeb4 YH |
680 | |
681 | if (key) { | |
682 | int offset = (ts) ? 3 : 0; | |
683 | ||
684 | rep.opt[offset++] = htonl((TCPOPT_NOP << 24) | | |
685 | (TCPOPT_NOP << 16) | | |
686 | (TCPOPT_MD5SIG << 8) | | |
687 | TCPOLEN_MD5SIG); | |
688 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; | |
689 | rep.th.doff = arg.iov[0].iov_len/4; | |
690 | ||
691 | tcp_v4_do_calc_md5_hash((__u8 *)&rep.opt[offset], | |
692 | key, | |
693 | skb->nh.iph->daddr, | |
694 | skb->nh.iph->saddr, | |
695 | &rep.th, IPPROTO_TCP, | |
696 | arg.iov[0].iov_len); | |
697 | } | |
698 | #endif | |
1da177e4 | 699 | arg.csum = csum_tcpudp_nofold(skb->nh.iph->daddr, |
7174259e | 700 | skb->nh.iph->saddr, /* XXX */ |
1da177e4 LT |
701 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
702 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; | |
703 | ||
704 | ip_send_reply(tcp_socket->sk, skb, &arg, arg.iov[0].iov_len); | |
705 | ||
706 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
707 | } | |
708 | ||
709 | static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
710 | { | |
8feaf0c0 | 711 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 712 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 713 | |
cfb6eeb4 | 714 | tcp_v4_send_ack(tcptw, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
7174259e ACM |
715 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
716 | tcptw->tw_ts_recent); | |
1da177e4 | 717 | |
8feaf0c0 | 718 | inet_twsk_put(tw); |
1da177e4 LT |
719 | } |
720 | ||
7174259e ACM |
721 | static void tcp_v4_reqsk_send_ack(struct sk_buff *skb, |
722 | struct request_sock *req) | |
1da177e4 | 723 | { |
cfb6eeb4 YH |
724 | tcp_v4_send_ack(NULL, skb, tcp_rsk(req)->snt_isn + 1, |
725 | tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, | |
1da177e4 LT |
726 | req->ts_recent); |
727 | } | |
728 | ||
1da177e4 LT |
729 | /* |
730 | * Send a SYN-ACK after having received an ACK. | |
60236fdd | 731 | * This still operates on a request_sock only, not on a big |
1da177e4 LT |
732 | * socket. |
733 | */ | |
60236fdd | 734 | static int tcp_v4_send_synack(struct sock *sk, struct request_sock *req, |
1da177e4 LT |
735 | struct dst_entry *dst) |
736 | { | |
2e6599cb | 737 | const struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 LT |
738 | int err = -1; |
739 | struct sk_buff * skb; | |
740 | ||
741 | /* First, grab a route. */ | |
463c84b9 | 742 | if (!dst && (dst = inet_csk_route_req(sk, req)) == NULL) |
1da177e4 LT |
743 | goto out; |
744 | ||
745 | skb = tcp_make_synack(sk, dst, req); | |
746 | ||
747 | if (skb) { | |
748 | struct tcphdr *th = skb->h.th; | |
749 | ||
ba7808ea | 750 | th->check = tcp_v4_check(skb->len, |
2e6599cb ACM |
751 | ireq->loc_addr, |
752 | ireq->rmt_addr, | |
1da177e4 LT |
753 | csum_partial((char *)th, skb->len, |
754 | skb->csum)); | |
755 | ||
2e6599cb ACM |
756 | err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, |
757 | ireq->rmt_addr, | |
758 | ireq->opt); | |
b9df3cb8 | 759 | err = net_xmit_eval(err); |
1da177e4 LT |
760 | } |
761 | ||
762 | out: | |
763 | dst_release(dst); | |
764 | return err; | |
765 | } | |
766 | ||
767 | /* | |
60236fdd | 768 | * IPv4 request_sock destructor. |
1da177e4 | 769 | */ |
60236fdd | 770 | static void tcp_v4_reqsk_destructor(struct request_sock *req) |
1da177e4 | 771 | { |
a51482bd | 772 | kfree(inet_rsk(req)->opt); |
1da177e4 LT |
773 | } |
774 | ||
80e40daa | 775 | #ifdef CONFIG_SYN_COOKIES |
40efc6fa | 776 | static void syn_flood_warning(struct sk_buff *skb) |
1da177e4 LT |
777 | { |
778 | static unsigned long warntime; | |
779 | ||
780 | if (time_after(jiffies, (warntime + HZ * 60))) { | |
781 | warntime = jiffies; | |
782 | printk(KERN_INFO | |
783 | "possible SYN flooding on port %d. Sending cookies.\n", | |
784 | ntohs(skb->h.th->dest)); | |
785 | } | |
786 | } | |
80e40daa | 787 | #endif |
1da177e4 LT |
788 | |
789 | /* | |
60236fdd | 790 | * Save and compile IPv4 options into the request_sock if needed. |
1da177e4 | 791 | */ |
40efc6fa SH |
792 | static struct ip_options *tcp_v4_save_options(struct sock *sk, |
793 | struct sk_buff *skb) | |
1da177e4 LT |
794 | { |
795 | struct ip_options *opt = &(IPCB(skb)->opt); | |
796 | struct ip_options *dopt = NULL; | |
797 | ||
798 | if (opt && opt->optlen) { | |
799 | int opt_size = optlength(opt); | |
800 | dopt = kmalloc(opt_size, GFP_ATOMIC); | |
801 | if (dopt) { | |
802 | if (ip_options_echo(dopt, skb)) { | |
803 | kfree(dopt); | |
804 | dopt = NULL; | |
805 | } | |
806 | } | |
807 | } | |
808 | return dopt; | |
809 | } | |
810 | ||
cfb6eeb4 YH |
811 | #ifdef CONFIG_TCP_MD5SIG |
812 | /* | |
813 | * RFC2385 MD5 checksumming requires a mapping of | |
814 | * IP address->MD5 Key. | |
815 | * We need to maintain these in the sk structure. | |
816 | */ | |
817 | ||
818 | /* Find the Key structure for an address. */ | |
7174259e ACM |
819 | static struct tcp_md5sig_key * |
820 | tcp_v4_md5_do_lookup(struct sock *sk, __be32 addr) | |
cfb6eeb4 YH |
821 | { |
822 | struct tcp_sock *tp = tcp_sk(sk); | |
823 | int i; | |
824 | ||
825 | if (!tp->md5sig_info || !tp->md5sig_info->entries4) | |
826 | return NULL; | |
827 | for (i = 0; i < tp->md5sig_info->entries4; i++) { | |
828 | if (tp->md5sig_info->keys4[i].addr == addr) | |
7174259e ACM |
829 | return (struct tcp_md5sig_key *) |
830 | &tp->md5sig_info->keys4[i]; | |
cfb6eeb4 YH |
831 | } |
832 | return NULL; | |
833 | } | |
834 | ||
835 | struct tcp_md5sig_key *tcp_v4_md5_lookup(struct sock *sk, | |
836 | struct sock *addr_sk) | |
837 | { | |
838 | return tcp_v4_md5_do_lookup(sk, inet_sk(addr_sk)->daddr); | |
839 | } | |
840 | ||
841 | EXPORT_SYMBOL(tcp_v4_md5_lookup); | |
842 | ||
f5b99bcd AB |
843 | static struct tcp_md5sig_key *tcp_v4_reqsk_md5_lookup(struct sock *sk, |
844 | struct request_sock *req) | |
cfb6eeb4 YH |
845 | { |
846 | return tcp_v4_md5_do_lookup(sk, inet_rsk(req)->rmt_addr); | |
847 | } | |
848 | ||
849 | /* This can be called on a newly created socket, from other files */ | |
850 | int tcp_v4_md5_do_add(struct sock *sk, __be32 addr, | |
851 | u8 *newkey, u8 newkeylen) | |
852 | { | |
853 | /* Add Key to the list */ | |
854 | struct tcp4_md5sig_key *key; | |
855 | struct tcp_sock *tp = tcp_sk(sk); | |
856 | struct tcp4_md5sig_key *keys; | |
857 | ||
f6685938 | 858 | key = (struct tcp4_md5sig_key *)tcp_v4_md5_do_lookup(sk, addr); |
cfb6eeb4 YH |
859 | if (key) { |
860 | /* Pre-existing entry - just update that one. */ | |
f6685938 | 861 | kfree(key->key); |
cfb6eeb4 YH |
862 | key->key = newkey; |
863 | key->keylen = newkeylen; | |
864 | } else { | |
f6685938 ACM |
865 | struct tcp_md5sig_info *md5sig; |
866 | ||
cfb6eeb4 | 867 | if (!tp->md5sig_info) { |
f6685938 ACM |
868 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), |
869 | GFP_ATOMIC); | |
cfb6eeb4 YH |
870 | if (!tp->md5sig_info) { |
871 | kfree(newkey); | |
872 | return -ENOMEM; | |
873 | } | |
874 | } | |
875 | if (tcp_alloc_md5sig_pool() == NULL) { | |
876 | kfree(newkey); | |
877 | return -ENOMEM; | |
878 | } | |
f6685938 ACM |
879 | md5sig = tp->md5sig_info; |
880 | ||
881 | if (md5sig->alloced4 == md5sig->entries4) { | |
882 | keys = kmalloc((sizeof(*keys) * | |
883 | (md5sig->entries4 + 1)), GFP_ATOMIC); | |
cfb6eeb4 YH |
884 | if (!keys) { |
885 | kfree(newkey); | |
886 | tcp_free_md5sig_pool(); | |
887 | return -ENOMEM; | |
888 | } | |
889 | ||
f6685938 ACM |
890 | if (md5sig->entries4) |
891 | memcpy(keys, md5sig->keys4, | |
892 | sizeof(*keys) * md5sig->entries4); | |
cfb6eeb4 YH |
893 | |
894 | /* Free old key list, and reference new one */ | |
f6685938 ACM |
895 | if (md5sig->keys4) |
896 | kfree(md5sig->keys4); | |
897 | md5sig->keys4 = keys; | |
898 | md5sig->alloced4++; | |
cfb6eeb4 | 899 | } |
f6685938 ACM |
900 | md5sig->entries4++; |
901 | md5sig->keys4[md5sig->entries4 - 1].addr = addr; | |
902 | md5sig->keys4[md5sig->entries4 - 1].key = newkey; | |
903 | md5sig->keys4[md5sig->entries4 - 1].keylen = newkeylen; | |
cfb6eeb4 YH |
904 | } |
905 | return 0; | |
906 | } | |
907 | ||
908 | EXPORT_SYMBOL(tcp_v4_md5_do_add); | |
909 | ||
910 | static int tcp_v4_md5_add_func(struct sock *sk, struct sock *addr_sk, | |
911 | u8 *newkey, u8 newkeylen) | |
912 | { | |
913 | return tcp_v4_md5_do_add(sk, inet_sk(addr_sk)->daddr, | |
914 | newkey, newkeylen); | |
915 | } | |
916 | ||
917 | int tcp_v4_md5_do_del(struct sock *sk, __be32 addr) | |
918 | { | |
919 | struct tcp_sock *tp = tcp_sk(sk); | |
920 | int i; | |
921 | ||
922 | for (i = 0; i < tp->md5sig_info->entries4; i++) { | |
923 | if (tp->md5sig_info->keys4[i].addr == addr) { | |
924 | /* Free the key */ | |
925 | kfree(tp->md5sig_info->keys4[i].key); | |
926 | tp->md5sig_info->entries4--; | |
927 | ||
928 | if (tp->md5sig_info->entries4 == 0) { | |
929 | kfree(tp->md5sig_info->keys4); | |
930 | tp->md5sig_info->keys4 = NULL; | |
8228a18d | 931 | tp->md5sig_info->alloced4 = 0; |
7174259e | 932 | } else if (tp->md5sig_info->entries4 != i) { |
cfb6eeb4 | 933 | /* Need to do some manipulation */ |
7174259e ACM |
934 | memcpy(&tp->md5sig_info->keys4[i], |
935 | &tp->md5sig_info->keys4[i+1], | |
936 | (tp->md5sig_info->entries4 - i) * | |
937 | sizeof(struct tcp4_md5sig_key)); | |
cfb6eeb4 YH |
938 | } |
939 | tcp_free_md5sig_pool(); | |
940 | return 0; | |
941 | } | |
942 | } | |
943 | return -ENOENT; | |
944 | } | |
945 | ||
946 | EXPORT_SYMBOL(tcp_v4_md5_do_del); | |
947 | ||
7174259e | 948 | static void tcp_v4_clear_md5_list(struct sock *sk) |
cfb6eeb4 YH |
949 | { |
950 | struct tcp_sock *tp = tcp_sk(sk); | |
951 | ||
952 | /* Free each key, then the set of key keys, | |
953 | * the crypto element, and then decrement our | |
954 | * hold on the last resort crypto. | |
955 | */ | |
956 | if (tp->md5sig_info->entries4) { | |
957 | int i; | |
958 | for (i = 0; i < tp->md5sig_info->entries4; i++) | |
959 | kfree(tp->md5sig_info->keys4[i].key); | |
960 | tp->md5sig_info->entries4 = 0; | |
961 | tcp_free_md5sig_pool(); | |
962 | } | |
963 | if (tp->md5sig_info->keys4) { | |
964 | kfree(tp->md5sig_info->keys4); | |
965 | tp->md5sig_info->keys4 = NULL; | |
966 | tp->md5sig_info->alloced4 = 0; | |
967 | } | |
968 | } | |
969 | ||
7174259e ACM |
970 | static int tcp_v4_parse_md5_keys(struct sock *sk, char __user *optval, |
971 | int optlen) | |
cfb6eeb4 YH |
972 | { |
973 | struct tcp_md5sig cmd; | |
974 | struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr; | |
975 | u8 *newkey; | |
976 | ||
977 | if (optlen < sizeof(cmd)) | |
978 | return -EINVAL; | |
979 | ||
7174259e | 980 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
cfb6eeb4 YH |
981 | return -EFAULT; |
982 | ||
983 | if (sin->sin_family != AF_INET) | |
984 | return -EINVAL; | |
985 | ||
986 | if (!cmd.tcpm_key || !cmd.tcpm_keylen) { | |
987 | if (!tcp_sk(sk)->md5sig_info) | |
988 | return -ENOENT; | |
989 | return tcp_v4_md5_do_del(sk, sin->sin_addr.s_addr); | |
990 | } | |
991 | ||
992 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
993 | return -EINVAL; | |
994 | ||
995 | if (!tcp_sk(sk)->md5sig_info) { | |
996 | struct tcp_sock *tp = tcp_sk(sk); | |
7174259e | 997 | struct tcp_md5sig_info *p = kzalloc(sizeof(*p), GFP_KERNEL); |
cfb6eeb4 | 998 | |
cfb6eeb4 YH |
999 | if (!p) |
1000 | return -EINVAL; | |
1001 | ||
1002 | tp->md5sig_info = p; | |
1003 | ||
1004 | } | |
1005 | ||
f6685938 | 1006 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
1007 | if (!newkey) |
1008 | return -ENOMEM; | |
cfb6eeb4 YH |
1009 | return tcp_v4_md5_do_add(sk, sin->sin_addr.s_addr, |
1010 | newkey, cmd.tcpm_keylen); | |
1011 | } | |
1012 | ||
1013 | static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, | |
1014 | __be32 saddr, __be32 daddr, | |
1015 | struct tcphdr *th, int protocol, | |
1016 | int tcplen) | |
1017 | { | |
1018 | struct scatterlist sg[4]; | |
1019 | __u16 data_len; | |
1020 | int block = 0; | |
8e5200f5 | 1021 | __sum16 old_checksum; |
cfb6eeb4 YH |
1022 | struct tcp_md5sig_pool *hp; |
1023 | struct tcp4_pseudohdr *bp; | |
1024 | struct hash_desc *desc; | |
1025 | int err; | |
1026 | unsigned int nbytes = 0; | |
1027 | ||
1028 | /* | |
1029 | * Okay, so RFC2385 is turned on for this connection, | |
1030 | * so we need to generate the MD5 hash for the packet now. | |
1031 | */ | |
1032 | ||
1033 | hp = tcp_get_md5sig_pool(); | |
1034 | if (!hp) | |
1035 | goto clear_hash_noput; | |
1036 | ||
1037 | bp = &hp->md5_blk.ip4; | |
1038 | desc = &hp->md5_desc; | |
1039 | ||
1040 | /* | |
1041 | * 1. the TCP pseudo-header (in the order: source IP address, | |
1042 | * destination IP address, zero-padded protocol number, and | |
1043 | * segment length) | |
1044 | */ | |
1045 | bp->saddr = saddr; | |
1046 | bp->daddr = daddr; | |
1047 | bp->pad = 0; | |
1048 | bp->protocol = protocol; | |
1049 | bp->len = htons(tcplen); | |
1050 | sg_set_buf(&sg[block++], bp, sizeof(*bp)); | |
1051 | nbytes += sizeof(*bp); | |
1052 | ||
cfb6eeb4 YH |
1053 | /* 2. the TCP header, excluding options, and assuming a |
1054 | * checksum of zero/ | |
1055 | */ | |
1056 | old_checksum = th->check; | |
1057 | th->check = 0; | |
1058 | sg_set_buf(&sg[block++], th, sizeof(struct tcphdr)); | |
1059 | nbytes += sizeof(struct tcphdr); | |
08dd1a50 | 1060 | |
cfb6eeb4 YH |
1061 | /* 3. the TCP segment data (if any) */ |
1062 | data_len = tcplen - (th->doff << 2); | |
1063 | if (data_len > 0) { | |
1064 | unsigned char *data = (unsigned char *)th + (th->doff << 2); | |
1065 | sg_set_buf(&sg[block++], data, data_len); | |
1066 | nbytes += data_len; | |
1067 | } | |
1068 | ||
1069 | /* 4. an independently-specified key or password, known to both | |
1070 | * TCPs and presumably connection-specific | |
1071 | */ | |
1072 | sg_set_buf(&sg[block++], key->key, key->keylen); | |
1073 | nbytes += key->keylen; | |
1074 | ||
cfb6eeb4 YH |
1075 | /* Now store the Hash into the packet */ |
1076 | err = crypto_hash_init(desc); | |
1077 | if (err) | |
1078 | goto clear_hash; | |
1079 | err = crypto_hash_update(desc, sg, nbytes); | |
1080 | if (err) | |
1081 | goto clear_hash; | |
1082 | err = crypto_hash_final(desc, md5_hash); | |
1083 | if (err) | |
1084 | goto clear_hash; | |
1085 | ||
1086 | /* Reset header, and free up the crypto */ | |
1087 | tcp_put_md5sig_pool(); | |
1088 | th->check = old_checksum; | |
1089 | ||
1090 | out: | |
cfb6eeb4 YH |
1091 | return 0; |
1092 | clear_hash: | |
1093 | tcp_put_md5sig_pool(); | |
1094 | clear_hash_noput: | |
1095 | memset(md5_hash, 0, 16); | |
1096 | goto out; | |
1097 | } | |
1098 | ||
1099 | int tcp_v4_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, | |
1100 | struct sock *sk, | |
1101 | struct dst_entry *dst, | |
1102 | struct request_sock *req, | |
1103 | struct tcphdr *th, int protocol, | |
1104 | int tcplen) | |
1105 | { | |
1106 | __be32 saddr, daddr; | |
1107 | ||
1108 | if (sk) { | |
1109 | saddr = inet_sk(sk)->saddr; | |
1110 | daddr = inet_sk(sk)->daddr; | |
1111 | } else { | |
1112 | struct rtable *rt = (struct rtable *)dst; | |
1113 | BUG_ON(!rt); | |
1114 | saddr = rt->rt_src; | |
1115 | daddr = rt->rt_dst; | |
1116 | } | |
1117 | return tcp_v4_do_calc_md5_hash(md5_hash, key, | |
1118 | saddr, daddr, | |
1119 | th, protocol, tcplen); | |
1120 | } | |
1121 | ||
1122 | EXPORT_SYMBOL(tcp_v4_calc_md5_hash); | |
1123 | ||
7174259e | 1124 | static int tcp_v4_inbound_md5_hash(struct sock *sk, struct sk_buff *skb) |
cfb6eeb4 YH |
1125 | { |
1126 | /* | |
1127 | * This gets called for each TCP segment that arrives | |
1128 | * so we want to be efficient. | |
1129 | * We have 3 drop cases: | |
1130 | * o No MD5 hash and one expected. | |
1131 | * o MD5 hash and we're not expecting one. | |
1132 | * o MD5 hash and its wrong. | |
1133 | */ | |
1134 | __u8 *hash_location = NULL; | |
1135 | struct tcp_md5sig_key *hash_expected; | |
1136 | struct iphdr *iph = skb->nh.iph; | |
1137 | struct tcphdr *th = skb->h.th; | |
7174259e | 1138 | int length = (th->doff << 2) - sizeof(struct tcphdr); |
cfb6eeb4 YH |
1139 | int genhash; |
1140 | unsigned char *ptr; | |
1141 | unsigned char newhash[16]; | |
1142 | ||
1143 | hash_expected = tcp_v4_md5_do_lookup(sk, iph->saddr); | |
1144 | ||
1145 | /* | |
1146 | * If the TCP option length is less than the TCP_MD5SIG | |
1147 | * option length, then we can shortcut | |
1148 | */ | |
1149 | if (length < TCPOLEN_MD5SIG) { | |
1150 | if (hash_expected) | |
1151 | return 1; | |
1152 | else | |
1153 | return 0; | |
1154 | } | |
1155 | ||
1156 | /* Okay, we can't shortcut - we have to grub through the options */ | |
1157 | ptr = (unsigned char *)(th + 1); | |
1158 | while (length > 0) { | |
1159 | int opcode = *ptr++; | |
1160 | int opsize; | |
1161 | ||
1162 | switch (opcode) { | |
1163 | case TCPOPT_EOL: | |
1164 | goto done_opts; | |
1165 | case TCPOPT_NOP: | |
1166 | length--; | |
1167 | continue; | |
1168 | default: | |
1169 | opsize = *ptr++; | |
1170 | if (opsize < 2) | |
1171 | goto done_opts; | |
1172 | if (opsize > length) | |
1173 | goto done_opts; | |
1174 | ||
1175 | if (opcode == TCPOPT_MD5SIG) { | |
1176 | hash_location = ptr; | |
1177 | goto done_opts; | |
1178 | } | |
1179 | } | |
1180 | ptr += opsize-2; | |
1181 | length -= opsize; | |
1182 | } | |
1183 | done_opts: | |
1184 | /* We've parsed the options - do we have a hash? */ | |
1185 | if (!hash_expected && !hash_location) | |
1186 | return 0; | |
1187 | ||
1188 | if (hash_expected && !hash_location) { | |
a9fc00cc | 1189 | LIMIT_NETDEBUG(KERN_INFO "MD5 Hash expected but NOT found " |
cfb6eeb4 | 1190 | "(" NIPQUAD_FMT ", %d)->(" NIPQUAD_FMT ", %d)\n", |
7174259e ACM |
1191 | NIPQUAD(iph->saddr), ntohs(th->source), |
1192 | NIPQUAD(iph->daddr), ntohs(th->dest)); | |
cfb6eeb4 YH |
1193 | return 1; |
1194 | } | |
1195 | ||
1196 | if (!hash_expected && hash_location) { | |
7174259e | 1197 | LIMIT_NETDEBUG(KERN_INFO "MD5 Hash NOT expected but found " |
cfb6eeb4 | 1198 | "(" NIPQUAD_FMT ", %d)->(" NIPQUAD_FMT ", %d)\n", |
7174259e ACM |
1199 | NIPQUAD(iph->saddr), ntohs(th->source), |
1200 | NIPQUAD(iph->daddr), ntohs(th->dest)); | |
cfb6eeb4 YH |
1201 | return 1; |
1202 | } | |
1203 | ||
1204 | /* Okay, so this is hash_expected and hash_location - | |
1205 | * so we need to calculate the checksum. | |
1206 | */ | |
1207 | genhash = tcp_v4_do_calc_md5_hash(newhash, | |
1208 | hash_expected, | |
1209 | iph->saddr, iph->daddr, | |
1210 | th, sk->sk_protocol, | |
1211 | skb->len); | |
1212 | ||
1213 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { | |
1214 | if (net_ratelimit()) { | |
1215 | printk(KERN_INFO "MD5 Hash failed for " | |
1216 | "(" NIPQUAD_FMT ", %d)->(" NIPQUAD_FMT ", %d)%s\n", | |
7174259e ACM |
1217 | NIPQUAD(iph->saddr), ntohs(th->source), |
1218 | NIPQUAD(iph->daddr), ntohs(th->dest), | |
cfb6eeb4 | 1219 | genhash ? " tcp_v4_calc_md5_hash failed" : ""); |
cfb6eeb4 YH |
1220 | } |
1221 | return 1; | |
1222 | } | |
1223 | return 0; | |
1224 | } | |
1225 | ||
1226 | #endif | |
1227 | ||
72a3effa | 1228 | struct request_sock_ops tcp_request_sock_ops __read_mostly = { |
1da177e4 | 1229 | .family = PF_INET, |
2e6599cb | 1230 | .obj_size = sizeof(struct tcp_request_sock), |
1da177e4 | 1231 | .rtx_syn_ack = tcp_v4_send_synack, |
60236fdd ACM |
1232 | .send_ack = tcp_v4_reqsk_send_ack, |
1233 | .destructor = tcp_v4_reqsk_destructor, | |
1da177e4 LT |
1234 | .send_reset = tcp_v4_send_reset, |
1235 | }; | |
1236 | ||
cfb6eeb4 | 1237 | #ifdef CONFIG_TCP_MD5SIG |
b6332e6c | 1238 | static struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = { |
cfb6eeb4 | 1239 | .md5_lookup = tcp_v4_reqsk_md5_lookup, |
cfb6eeb4 | 1240 | }; |
b6332e6c | 1241 | #endif |
cfb6eeb4 | 1242 | |
6d6ee43e ACM |
1243 | static struct timewait_sock_ops tcp_timewait_sock_ops = { |
1244 | .twsk_obj_size = sizeof(struct tcp_timewait_sock), | |
1245 | .twsk_unique = tcp_twsk_unique, | |
cfb6eeb4 | 1246 | .twsk_destructor= tcp_twsk_destructor, |
6d6ee43e ACM |
1247 | }; |
1248 | ||
1da177e4 LT |
1249 | int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) |
1250 | { | |
2e6599cb | 1251 | struct inet_request_sock *ireq; |
1da177e4 | 1252 | struct tcp_options_received tmp_opt; |
60236fdd | 1253 | struct request_sock *req; |
adaf345b AV |
1254 | __be32 saddr = skb->nh.iph->saddr; |
1255 | __be32 daddr = skb->nh.iph->daddr; | |
1da177e4 LT |
1256 | __u32 isn = TCP_SKB_CB(skb)->when; |
1257 | struct dst_entry *dst = NULL; | |
1258 | #ifdef CONFIG_SYN_COOKIES | |
1259 | int want_cookie = 0; | |
1260 | #else | |
1261 | #define want_cookie 0 /* Argh, why doesn't gcc optimize this :( */ | |
1262 | #endif | |
1263 | ||
1264 | /* Never answer to SYNs send to broadcast or multicast */ | |
1265 | if (((struct rtable *)skb->dst)->rt_flags & | |
1266 | (RTCF_BROADCAST | RTCF_MULTICAST)) | |
1267 | goto drop; | |
1268 | ||
1269 | /* TW buckets are converted to open requests without | |
1270 | * limitations, they conserve resources and peer is | |
1271 | * evidently real one. | |
1272 | */ | |
463c84b9 | 1273 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 LT |
1274 | #ifdef CONFIG_SYN_COOKIES |
1275 | if (sysctl_tcp_syncookies) { | |
1276 | want_cookie = 1; | |
1277 | } else | |
1278 | #endif | |
1279 | goto drop; | |
1280 | } | |
1281 | ||
1282 | /* Accept backlog is full. If we have already queued enough | |
1283 | * of warm entries in syn queue, drop request. It is better than | |
1284 | * clogging syn queue with openreqs with exponentially increasing | |
1285 | * timeout. | |
1286 | */ | |
463c84b9 | 1287 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1288 | goto drop; |
1289 | ||
60236fdd | 1290 | req = reqsk_alloc(&tcp_request_sock_ops); |
1da177e4 LT |
1291 | if (!req) |
1292 | goto drop; | |
1293 | ||
cfb6eeb4 YH |
1294 | #ifdef CONFIG_TCP_MD5SIG |
1295 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv4_ops; | |
1296 | #endif | |
1297 | ||
1da177e4 LT |
1298 | tcp_clear_options(&tmp_opt); |
1299 | tmp_opt.mss_clamp = 536; | |
1300 | tmp_opt.user_mss = tcp_sk(sk)->rx_opt.user_mss; | |
1301 | ||
1302 | tcp_parse_options(skb, &tmp_opt, 0); | |
1303 | ||
1304 | if (want_cookie) { | |
1305 | tcp_clear_options(&tmp_opt); | |
1306 | tmp_opt.saw_tstamp = 0; | |
1307 | } | |
1308 | ||
1309 | if (tmp_opt.saw_tstamp && !tmp_opt.rcv_tsval) { | |
1310 | /* Some OSes (unknown ones, but I see them on web server, which | |
1311 | * contains information interesting only for windows' | |
1312 | * users) do not send their stamp in SYN. It is easy case. | |
1313 | * We simply do not advertise TS support. | |
1314 | */ | |
1315 | tmp_opt.saw_tstamp = 0; | |
1316 | tmp_opt.tstamp_ok = 0; | |
1317 | } | |
1318 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; | |
1319 | ||
1320 | tcp_openreq_init(req, &tmp_opt, skb); | |
1321 | ||
4237c75c VY |
1322 | if (security_inet_conn_request(sk, skb, req)) |
1323 | goto drop_and_free; | |
1324 | ||
2e6599cb ACM |
1325 | ireq = inet_rsk(req); |
1326 | ireq->loc_addr = daddr; | |
1327 | ireq->rmt_addr = saddr; | |
1328 | ireq->opt = tcp_v4_save_options(sk, skb); | |
1da177e4 LT |
1329 | if (!want_cookie) |
1330 | TCP_ECN_create_request(req, skb->h.th); | |
1331 | ||
1332 | if (want_cookie) { | |
1333 | #ifdef CONFIG_SYN_COOKIES | |
1334 | syn_flood_warning(skb); | |
1335 | #endif | |
1336 | isn = cookie_v4_init_sequence(sk, skb, &req->mss); | |
1337 | } else if (!isn) { | |
1338 | struct inet_peer *peer = NULL; | |
1339 | ||
1340 | /* VJ's idea. We save last timestamp seen | |
1341 | * from the destination in peer table, when entering | |
1342 | * state TIME-WAIT, and check against it before | |
1343 | * accepting new connection request. | |
1344 | * | |
1345 | * If "isn" is not zero, this request hit alive | |
1346 | * timewait bucket, so that all the necessary checks | |
1347 | * are made in the function processing timewait state. | |
1348 | */ | |
1349 | if (tmp_opt.saw_tstamp && | |
295ff7ed | 1350 | tcp_death_row.sysctl_tw_recycle && |
463c84b9 | 1351 | (dst = inet_csk_route_req(sk, req)) != NULL && |
1da177e4 LT |
1352 | (peer = rt_get_peer((struct rtable *)dst)) != NULL && |
1353 | peer->v4daddr == saddr) { | |
1354 | if (xtime.tv_sec < peer->tcp_ts_stamp + TCP_PAWS_MSL && | |
1355 | (s32)(peer->tcp_ts - req->ts_recent) > | |
1356 | TCP_PAWS_WINDOW) { | |
1357 | NET_INC_STATS_BH(LINUX_MIB_PAWSPASSIVEREJECTED); | |
1358 | dst_release(dst); | |
1359 | goto drop_and_free; | |
1360 | } | |
1361 | } | |
1362 | /* Kill the following clause, if you dislike this way. */ | |
1363 | else if (!sysctl_tcp_syncookies && | |
463c84b9 | 1364 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < |
1da177e4 LT |
1365 | (sysctl_max_syn_backlog >> 2)) && |
1366 | (!peer || !peer->tcp_ts_stamp) && | |
1367 | (!dst || !dst_metric(dst, RTAX_RTT))) { | |
1368 | /* Without syncookies last quarter of | |
1369 | * backlog is filled with destinations, | |
1370 | * proven to be alive. | |
1371 | * It means that we continue to communicate | |
1372 | * to destinations, already remembered | |
1373 | * to the moment of synflood. | |
1374 | */ | |
64ce2073 PM |
1375 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open " |
1376 | "request from %u.%u.%u.%u/%u\n", | |
1377 | NIPQUAD(saddr), | |
1378 | ntohs(skb->h.th->source)); | |
1da177e4 LT |
1379 | dst_release(dst); |
1380 | goto drop_and_free; | |
1381 | } | |
1382 | ||
a94f723d | 1383 | isn = tcp_v4_init_sequence(skb); |
1da177e4 | 1384 | } |
2e6599cb | 1385 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 LT |
1386 | |
1387 | if (tcp_v4_send_synack(sk, req, dst)) | |
1388 | goto drop_and_free; | |
1389 | ||
1390 | if (want_cookie) { | |
60236fdd | 1391 | reqsk_free(req); |
1da177e4 | 1392 | } else { |
3f421baa | 1393 | inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1da177e4 LT |
1394 | } |
1395 | return 0; | |
1396 | ||
1397 | drop_and_free: | |
60236fdd | 1398 | reqsk_free(req); |
1da177e4 | 1399 | drop: |
1da177e4 LT |
1400 | return 0; |
1401 | } | |
1402 | ||
1403 | ||
1404 | /* | |
1405 | * The three way handshake has completed - we got a valid synack - | |
1406 | * now create the new socket. | |
1407 | */ | |
1408 | struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1409 | struct request_sock *req, |
1da177e4 LT |
1410 | struct dst_entry *dst) |
1411 | { | |
2e6599cb | 1412 | struct inet_request_sock *ireq; |
1da177e4 LT |
1413 | struct inet_sock *newinet; |
1414 | struct tcp_sock *newtp; | |
1415 | struct sock *newsk; | |
cfb6eeb4 YH |
1416 | #ifdef CONFIG_TCP_MD5SIG |
1417 | struct tcp_md5sig_key *key; | |
1418 | #endif | |
1da177e4 LT |
1419 | |
1420 | if (sk_acceptq_is_full(sk)) | |
1421 | goto exit_overflow; | |
1422 | ||
463c84b9 | 1423 | if (!dst && (dst = inet_csk_route_req(sk, req)) == NULL) |
1da177e4 LT |
1424 | goto exit; |
1425 | ||
1426 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1427 | if (!newsk) | |
1428 | goto exit; | |
1429 | ||
bcd76111 | 1430 | newsk->sk_gso_type = SKB_GSO_TCPV4; |
6cbb0df7 | 1431 | sk_setup_caps(newsk, dst); |
1da177e4 LT |
1432 | |
1433 | newtp = tcp_sk(newsk); | |
1434 | newinet = inet_sk(newsk); | |
2e6599cb ACM |
1435 | ireq = inet_rsk(req); |
1436 | newinet->daddr = ireq->rmt_addr; | |
1437 | newinet->rcv_saddr = ireq->loc_addr; | |
1438 | newinet->saddr = ireq->loc_addr; | |
1439 | newinet->opt = ireq->opt; | |
1440 | ireq->opt = NULL; | |
463c84b9 | 1441 | newinet->mc_index = inet_iif(skb); |
1da177e4 | 1442 | newinet->mc_ttl = skb->nh.iph->ttl; |
d83d8461 | 1443 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1444 | if (newinet->opt) |
d83d8461 | 1445 | inet_csk(newsk)->icsk_ext_hdr_len = newinet->opt->optlen; |
1da177e4 LT |
1446 | newinet->id = newtp->write_seq ^ jiffies; |
1447 | ||
5d424d5a | 1448 | tcp_mtup_init(newsk); |
1da177e4 LT |
1449 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1450 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1451 | tcp_initialize_rcv_mss(newsk); | |
1452 | ||
cfb6eeb4 YH |
1453 | #ifdef CONFIG_TCP_MD5SIG |
1454 | /* Copy over the MD5 key from the original socket */ | |
1455 | if ((key = tcp_v4_md5_do_lookup(sk, newinet->daddr)) != NULL) { | |
1456 | /* | |
1457 | * We're using one, so create a matching key | |
1458 | * on the newsk structure. If we fail to get | |
1459 | * memory, then we end up not copying the key | |
1460 | * across. Shucks. | |
1461 | */ | |
f6685938 ACM |
1462 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1463 | if (newkey != NULL) | |
cfb6eeb4 YH |
1464 | tcp_v4_md5_do_add(newsk, inet_sk(sk)->daddr, |
1465 | newkey, key->keylen); | |
cfb6eeb4 YH |
1466 | } |
1467 | #endif | |
1468 | ||
f3f05f70 | 1469 | __inet_hash(&tcp_hashinfo, newsk, 0); |
2d8c4ce5 | 1470 | __inet_inherit_port(&tcp_hashinfo, sk, newsk); |
1da177e4 LT |
1471 | |
1472 | return newsk; | |
1473 | ||
1474 | exit_overflow: | |
1475 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
1476 | exit: | |
1477 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
1478 | dst_release(dst); | |
1479 | return NULL; | |
1480 | } | |
1481 | ||
1482 | static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) | |
1483 | { | |
1484 | struct tcphdr *th = skb->h.th; | |
1485 | struct iphdr *iph = skb->nh.iph; | |
1da177e4 | 1486 | struct sock *nsk; |
60236fdd | 1487 | struct request_sock **prev; |
1da177e4 | 1488 | /* Find possible connection requests. */ |
463c84b9 ACM |
1489 | struct request_sock *req = inet_csk_search_req(sk, &prev, th->source, |
1490 | iph->saddr, iph->daddr); | |
1da177e4 LT |
1491 | if (req) |
1492 | return tcp_check_req(sk, skb, req, prev); | |
1493 | ||
8f491069 HX |
1494 | nsk = inet_lookup_established(&tcp_hashinfo, skb->nh.iph->saddr, |
1495 | th->source, skb->nh.iph->daddr, | |
1496 | th->dest, inet_iif(skb)); | |
1da177e4 LT |
1497 | |
1498 | if (nsk) { | |
1499 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1500 | bh_lock_sock(nsk); | |
1501 | return nsk; | |
1502 | } | |
9469c7b4 | 1503 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1504 | return NULL; |
1505 | } | |
1506 | ||
1507 | #ifdef CONFIG_SYN_COOKIES | |
1508 | if (!th->rst && !th->syn && th->ack) | |
1509 | sk = cookie_v4_check(sk, skb, &(IPCB(skb)->opt)); | |
1510 | #endif | |
1511 | return sk; | |
1512 | } | |
1513 | ||
b51655b9 | 1514 | static __sum16 tcp_v4_checksum_init(struct sk_buff *skb) |
1da177e4 | 1515 | { |
84fa7933 | 1516 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
ba7808ea | 1517 | if (!tcp_v4_check(skb->len, skb->nh.iph->saddr, |
fb286bb2 HX |
1518 | skb->nh.iph->daddr, skb->csum)) { |
1519 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1da177e4 | 1520 | return 0; |
fb286bb2 | 1521 | } |
1da177e4 | 1522 | } |
fb286bb2 HX |
1523 | |
1524 | skb->csum = csum_tcpudp_nofold(skb->nh.iph->saddr, skb->nh.iph->daddr, | |
1525 | skb->len, IPPROTO_TCP, 0); | |
1526 | ||
1da177e4 | 1527 | if (skb->len <= 76) { |
fb286bb2 | 1528 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1529 | } |
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | ||
1534 | /* The socket must have it's spinlock held when we get | |
1535 | * here. | |
1536 | * | |
1537 | * We have a potential double-lock case here, so even when | |
1538 | * doing backlog processing we use the BH locking scheme. | |
1539 | * This is because we cannot sleep with the original spinlock | |
1540 | * held. | |
1541 | */ | |
1542 | int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1543 | { | |
cfb6eeb4 YH |
1544 | struct sock *rsk; |
1545 | #ifdef CONFIG_TCP_MD5SIG | |
1546 | /* | |
1547 | * We really want to reject the packet as early as possible | |
1548 | * if: | |
1549 | * o We're expecting an MD5'd packet and this is no MD5 tcp option | |
1550 | * o There is an MD5 option and we're not expecting one | |
1551 | */ | |
7174259e | 1552 | if (tcp_v4_inbound_md5_hash(sk, skb)) |
cfb6eeb4 YH |
1553 | goto discard; |
1554 | #endif | |
1555 | ||
1da177e4 LT |
1556 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
1557 | TCP_CHECK_TIMER(sk); | |
cfb6eeb4 YH |
1558 | if (tcp_rcv_established(sk, skb, skb->h.th, skb->len)) { |
1559 | rsk = sk; | |
1da177e4 | 1560 | goto reset; |
cfb6eeb4 | 1561 | } |
1da177e4 LT |
1562 | TCP_CHECK_TIMER(sk); |
1563 | return 0; | |
1564 | } | |
1565 | ||
1566 | if (skb->len < (skb->h.th->doff << 2) || tcp_checksum_complete(skb)) | |
1567 | goto csum_err; | |
1568 | ||
1569 | if (sk->sk_state == TCP_LISTEN) { | |
1570 | struct sock *nsk = tcp_v4_hnd_req(sk, skb); | |
1571 | if (!nsk) | |
1572 | goto discard; | |
1573 | ||
1574 | if (nsk != sk) { | |
cfb6eeb4 YH |
1575 | if (tcp_child_process(sk, nsk, skb)) { |
1576 | rsk = nsk; | |
1da177e4 | 1577 | goto reset; |
cfb6eeb4 | 1578 | } |
1da177e4 LT |
1579 | return 0; |
1580 | } | |
1581 | } | |
1582 | ||
1583 | TCP_CHECK_TIMER(sk); | |
cfb6eeb4 YH |
1584 | if (tcp_rcv_state_process(sk, skb, skb->h.th, skb->len)) { |
1585 | rsk = sk; | |
1da177e4 | 1586 | goto reset; |
cfb6eeb4 | 1587 | } |
1da177e4 LT |
1588 | TCP_CHECK_TIMER(sk); |
1589 | return 0; | |
1590 | ||
1591 | reset: | |
cfb6eeb4 | 1592 | tcp_v4_send_reset(rsk, skb); |
1da177e4 LT |
1593 | discard: |
1594 | kfree_skb(skb); | |
1595 | /* Be careful here. If this function gets more complicated and | |
1596 | * gcc suffers from register pressure on the x86, sk (in %ebx) | |
1597 | * might be destroyed here. This current version compiles correctly, | |
1598 | * but you have been warned. | |
1599 | */ | |
1600 | return 0; | |
1601 | ||
1602 | csum_err: | |
1603 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1604 | goto discard; | |
1605 | } | |
1606 | ||
1607 | /* | |
1608 | * From tcp_input.c | |
1609 | */ | |
1610 | ||
1611 | int tcp_v4_rcv(struct sk_buff *skb) | |
1612 | { | |
1613 | struct tcphdr *th; | |
1614 | struct sock *sk; | |
1615 | int ret; | |
1616 | ||
1617 | if (skb->pkt_type != PACKET_HOST) | |
1618 | goto discard_it; | |
1619 | ||
1620 | /* Count it even if it's bad */ | |
1621 | TCP_INC_STATS_BH(TCP_MIB_INSEGS); | |
1622 | ||
1623 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1624 | goto discard_it; | |
1625 | ||
1626 | th = skb->h.th; | |
1627 | ||
1628 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1629 | goto bad_packet; | |
1630 | if (!pskb_may_pull(skb, th->doff * 4)) | |
1631 | goto discard_it; | |
1632 | ||
1633 | /* An explanation is required here, I think. | |
1634 | * Packet length and doff are validated by header prediction, | |
caa20d9a | 1635 | * provided case of th->doff==0 is eliminated. |
1da177e4 LT |
1636 | * So, we defer the checks. */ |
1637 | if ((skb->ip_summed != CHECKSUM_UNNECESSARY && | |
fb286bb2 | 1638 | tcp_v4_checksum_init(skb))) |
1da177e4 LT |
1639 | goto bad_packet; |
1640 | ||
1641 | th = skb->h.th; | |
1642 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1643 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1644 | skb->len - th->doff * 4); | |
1645 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1646 | TCP_SKB_CB(skb)->when = 0; | |
1647 | TCP_SKB_CB(skb)->flags = skb->nh.iph->tos; | |
1648 | TCP_SKB_CB(skb)->sacked = 0; | |
1649 | ||
e48c414e | 1650 | sk = __inet_lookup(&tcp_hashinfo, skb->nh.iph->saddr, th->source, |
8f491069 | 1651 | skb->nh.iph->daddr, th->dest, |
463c84b9 | 1652 | inet_iif(skb)); |
1da177e4 LT |
1653 | |
1654 | if (!sk) | |
1655 | goto no_tcp_socket; | |
1656 | ||
1657 | process: | |
1658 | if (sk->sk_state == TCP_TIME_WAIT) | |
1659 | goto do_time_wait; | |
1660 | ||
1661 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1662 | goto discard_and_relse; | |
b59c2701 | 1663 | nf_reset(skb); |
1da177e4 | 1664 | |
fda9ef5d | 1665 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1666 | goto discard_and_relse; |
1667 | ||
1668 | skb->dev = NULL; | |
1669 | ||
c6366184 | 1670 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1671 | ret = 0; |
1672 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 CL |
1673 | #ifdef CONFIG_NET_DMA |
1674 | struct tcp_sock *tp = tcp_sk(sk); | |
1675 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) | |
1676 | tp->ucopy.dma_chan = get_softnet_dma(); | |
1677 | if (tp->ucopy.dma_chan) | |
1da177e4 | 1678 | ret = tcp_v4_do_rcv(sk, skb); |
1a2449a8 CL |
1679 | else |
1680 | #endif | |
1681 | { | |
1682 | if (!tcp_prequeue(sk, skb)) | |
1683 | ret = tcp_v4_do_rcv(sk, skb); | |
1684 | } | |
1da177e4 LT |
1685 | } else |
1686 | sk_add_backlog(sk, skb); | |
1687 | bh_unlock_sock(sk); | |
1688 | ||
1689 | sock_put(sk); | |
1690 | ||
1691 | return ret; | |
1692 | ||
1693 | no_tcp_socket: | |
1694 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1695 | goto discard_it; | |
1696 | ||
1697 | if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { | |
1698 | bad_packet: | |
1699 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1700 | } else { | |
cfb6eeb4 | 1701 | tcp_v4_send_reset(NULL, skb); |
1da177e4 LT |
1702 | } |
1703 | ||
1704 | discard_it: | |
1705 | /* Discard frame. */ | |
1706 | kfree_skb(skb); | |
1707 | return 0; | |
1708 | ||
1709 | discard_and_relse: | |
1710 | sock_put(sk); | |
1711 | goto discard_it; | |
1712 | ||
1713 | do_time_wait: | |
1714 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1715 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1716 | goto discard_it; |
1717 | } | |
1718 | ||
1719 | if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { | |
1720 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
9469c7b4 | 1721 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1722 | goto discard_it; |
1723 | } | |
9469c7b4 | 1724 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 | 1725 | case TCP_TW_SYN: { |
33b62231 ACM |
1726 | struct sock *sk2 = inet_lookup_listener(&tcp_hashinfo, |
1727 | skb->nh.iph->daddr, | |
8f491069 | 1728 | th->dest, |
463c84b9 | 1729 | inet_iif(skb)); |
1da177e4 | 1730 | if (sk2) { |
9469c7b4 YH |
1731 | inet_twsk_deschedule(inet_twsk(sk), &tcp_death_row); |
1732 | inet_twsk_put(inet_twsk(sk)); | |
1da177e4 LT |
1733 | sk = sk2; |
1734 | goto process; | |
1735 | } | |
1736 | /* Fall through to ACK */ | |
1737 | } | |
1738 | case TCP_TW_ACK: | |
1739 | tcp_v4_timewait_ack(sk, skb); | |
1740 | break; | |
1741 | case TCP_TW_RST: | |
1742 | goto no_tcp_socket; | |
1743 | case TCP_TW_SUCCESS:; | |
1744 | } | |
1745 | goto discard_it; | |
1746 | } | |
1747 | ||
1da177e4 LT |
1748 | /* VJ's idea. Save last timestamp seen from this destination |
1749 | * and hold it at least for normal timewait interval to use for duplicate | |
1750 | * segment detection in subsequent connections, before they enter synchronized | |
1751 | * state. | |
1752 | */ | |
1753 | ||
1754 | int tcp_v4_remember_stamp(struct sock *sk) | |
1755 | { | |
1756 | struct inet_sock *inet = inet_sk(sk); | |
1757 | struct tcp_sock *tp = tcp_sk(sk); | |
1758 | struct rtable *rt = (struct rtable *)__sk_dst_get(sk); | |
1759 | struct inet_peer *peer = NULL; | |
1760 | int release_it = 0; | |
1761 | ||
1762 | if (!rt || rt->rt_dst != inet->daddr) { | |
1763 | peer = inet_getpeer(inet->daddr, 1); | |
1764 | release_it = 1; | |
1765 | } else { | |
1766 | if (!rt->peer) | |
1767 | rt_bind_peer(rt, 1); | |
1768 | peer = rt->peer; | |
1769 | } | |
1770 | ||
1771 | if (peer) { | |
1772 | if ((s32)(peer->tcp_ts - tp->rx_opt.ts_recent) <= 0 || | |
1773 | (peer->tcp_ts_stamp + TCP_PAWS_MSL < xtime.tv_sec && | |
1774 | peer->tcp_ts_stamp <= tp->rx_opt.ts_recent_stamp)) { | |
1775 | peer->tcp_ts_stamp = tp->rx_opt.ts_recent_stamp; | |
1776 | peer->tcp_ts = tp->rx_opt.ts_recent; | |
1777 | } | |
1778 | if (release_it) | |
1779 | inet_putpeer(peer); | |
1780 | return 1; | |
1781 | } | |
1782 | ||
1783 | return 0; | |
1784 | } | |
1785 | ||
8feaf0c0 | 1786 | int tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw) |
1da177e4 | 1787 | { |
8feaf0c0 | 1788 | struct inet_peer *peer = inet_getpeer(tw->tw_daddr, 1); |
1da177e4 LT |
1789 | |
1790 | if (peer) { | |
8feaf0c0 ACM |
1791 | const struct tcp_timewait_sock *tcptw = tcp_twsk((struct sock *)tw); |
1792 | ||
1793 | if ((s32)(peer->tcp_ts - tcptw->tw_ts_recent) <= 0 || | |
1da177e4 | 1794 | (peer->tcp_ts_stamp + TCP_PAWS_MSL < xtime.tv_sec && |
8feaf0c0 ACM |
1795 | peer->tcp_ts_stamp <= tcptw->tw_ts_recent_stamp)) { |
1796 | peer->tcp_ts_stamp = tcptw->tw_ts_recent_stamp; | |
1797 | peer->tcp_ts = tcptw->tw_ts_recent; | |
1da177e4 LT |
1798 | } |
1799 | inet_putpeer(peer); | |
1800 | return 1; | |
1801 | } | |
1802 | ||
1803 | return 0; | |
1804 | } | |
1805 | ||
8292a17a | 1806 | struct inet_connection_sock_af_ops ipv4_specific = { |
543d9cfe ACM |
1807 | .queue_xmit = ip_queue_xmit, |
1808 | .send_check = tcp_v4_send_check, | |
1809 | .rebuild_header = inet_sk_rebuild_header, | |
1810 | .conn_request = tcp_v4_conn_request, | |
1811 | .syn_recv_sock = tcp_v4_syn_recv_sock, | |
1812 | .remember_stamp = tcp_v4_remember_stamp, | |
1813 | .net_header_len = sizeof(struct iphdr), | |
1814 | .setsockopt = ip_setsockopt, | |
1815 | .getsockopt = ip_getsockopt, | |
1816 | .addr2sockaddr = inet_csk_addr2sockaddr, | |
1817 | .sockaddr_len = sizeof(struct sockaddr_in), | |
3fdadf7d | 1818 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1819 | .compat_setsockopt = compat_ip_setsockopt, |
1820 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 1821 | #endif |
1da177e4 LT |
1822 | }; |
1823 | ||
cfb6eeb4 | 1824 | #ifdef CONFIG_TCP_MD5SIG |
b6332e6c | 1825 | static struct tcp_sock_af_ops tcp_sock_ipv4_specific = { |
cfb6eeb4 YH |
1826 | .md5_lookup = tcp_v4_md5_lookup, |
1827 | .calc_md5_hash = tcp_v4_calc_md5_hash, | |
1828 | .md5_add = tcp_v4_md5_add_func, | |
1829 | .md5_parse = tcp_v4_parse_md5_keys, | |
cfb6eeb4 | 1830 | }; |
b6332e6c | 1831 | #endif |
cfb6eeb4 | 1832 | |
1da177e4 LT |
1833 | /* NOTE: A lot of things set to zero explicitly by call to |
1834 | * sk_alloc() so need not be done here. | |
1835 | */ | |
1836 | static int tcp_v4_init_sock(struct sock *sk) | |
1837 | { | |
6687e988 | 1838 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1839 | struct tcp_sock *tp = tcp_sk(sk); |
1840 | ||
1841 | skb_queue_head_init(&tp->out_of_order_queue); | |
1842 | tcp_init_xmit_timers(sk); | |
1843 | tcp_prequeue_init(tp); | |
1844 | ||
6687e988 | 1845 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1846 | tp->mdev = TCP_TIMEOUT_INIT; |
1847 | ||
1848 | /* So many TCP implementations out there (incorrectly) count the | |
1849 | * initial SYN frame in their delayed-ACK and congestion control | |
1850 | * algorithms that we must have the following bandaid to talk | |
1851 | * efficiently to them. -DaveM | |
1852 | */ | |
1853 | tp->snd_cwnd = 2; | |
1854 | ||
1855 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1856 | * initialization of these values. | |
1857 | */ | |
1858 | tp->snd_ssthresh = 0x7fffffff; /* Infinity */ | |
1859 | tp->snd_cwnd_clamp = ~0; | |
c1b4a7e6 | 1860 | tp->mss_cache = 536; |
1da177e4 LT |
1861 | |
1862 | tp->reordering = sysctl_tcp_reordering; | |
6687e988 | 1863 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
1da177e4 LT |
1864 | |
1865 | sk->sk_state = TCP_CLOSE; | |
1866 | ||
1867 | sk->sk_write_space = sk_stream_write_space; | |
1868 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1869 | ||
8292a17a | 1870 | icsk->icsk_af_ops = &ipv4_specific; |
d83d8461 | 1871 | icsk->icsk_sync_mss = tcp_sync_mss; |
cfb6eeb4 YH |
1872 | #ifdef CONFIG_TCP_MD5SIG |
1873 | tp->af_specific = &tcp_sock_ipv4_specific; | |
1874 | #endif | |
1da177e4 LT |
1875 | |
1876 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; | |
1877 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1878 | ||
1879 | atomic_inc(&tcp_sockets_allocated); | |
1880 | ||
1881 | return 0; | |
1882 | } | |
1883 | ||
1884 | int tcp_v4_destroy_sock(struct sock *sk) | |
1885 | { | |
1886 | struct tcp_sock *tp = tcp_sk(sk); | |
1887 | ||
1888 | tcp_clear_xmit_timers(sk); | |
1889 | ||
6687e988 | 1890 | tcp_cleanup_congestion_control(sk); |
317a76f9 | 1891 | |
1da177e4 LT |
1892 | /* Cleanup up the write buffer. */ |
1893 | sk_stream_writequeue_purge(sk); | |
1894 | ||
1895 | /* Cleans up our, hopefully empty, out_of_order_queue. */ | |
1896 | __skb_queue_purge(&tp->out_of_order_queue); | |
1897 | ||
cfb6eeb4 YH |
1898 | #ifdef CONFIG_TCP_MD5SIG |
1899 | /* Clean up the MD5 key list, if any */ | |
1900 | if (tp->md5sig_info) { | |
1901 | tcp_v4_clear_md5_list(sk); | |
1902 | kfree(tp->md5sig_info); | |
1903 | tp->md5sig_info = NULL; | |
1904 | } | |
1905 | #endif | |
1906 | ||
1a2449a8 CL |
1907 | #ifdef CONFIG_NET_DMA |
1908 | /* Cleans up our sk_async_wait_queue */ | |
1909 | __skb_queue_purge(&sk->sk_async_wait_queue); | |
1910 | #endif | |
1911 | ||
1da177e4 LT |
1912 | /* Clean prequeue, it must be empty really */ |
1913 | __skb_queue_purge(&tp->ucopy.prequeue); | |
1914 | ||
1915 | /* Clean up a referenced TCP bind bucket. */ | |
463c84b9 | 1916 | if (inet_csk(sk)->icsk_bind_hash) |
2d8c4ce5 | 1917 | inet_put_port(&tcp_hashinfo, sk); |
1da177e4 LT |
1918 | |
1919 | /* | |
1920 | * If sendmsg cached page exists, toss it. | |
1921 | */ | |
1922 | if (sk->sk_sndmsg_page) { | |
1923 | __free_page(sk->sk_sndmsg_page); | |
1924 | sk->sk_sndmsg_page = NULL; | |
1925 | } | |
1926 | ||
1927 | atomic_dec(&tcp_sockets_allocated); | |
1928 | ||
1929 | return 0; | |
1930 | } | |
1931 | ||
1932 | EXPORT_SYMBOL(tcp_v4_destroy_sock); | |
1933 | ||
1934 | #ifdef CONFIG_PROC_FS | |
1935 | /* Proc filesystem TCP sock list dumping. */ | |
1936 | ||
8feaf0c0 | 1937 | static inline struct inet_timewait_sock *tw_head(struct hlist_head *head) |
1da177e4 LT |
1938 | { |
1939 | return hlist_empty(head) ? NULL : | |
8feaf0c0 | 1940 | list_entry(head->first, struct inet_timewait_sock, tw_node); |
1da177e4 LT |
1941 | } |
1942 | ||
8feaf0c0 | 1943 | static inline struct inet_timewait_sock *tw_next(struct inet_timewait_sock *tw) |
1da177e4 LT |
1944 | { |
1945 | return tw->tw_node.next ? | |
1946 | hlist_entry(tw->tw_node.next, typeof(*tw), tw_node) : NULL; | |
1947 | } | |
1948 | ||
1949 | static void *listening_get_next(struct seq_file *seq, void *cur) | |
1950 | { | |
463c84b9 | 1951 | struct inet_connection_sock *icsk; |
1da177e4 LT |
1952 | struct hlist_node *node; |
1953 | struct sock *sk = cur; | |
1954 | struct tcp_iter_state* st = seq->private; | |
1955 | ||
1956 | if (!sk) { | |
1957 | st->bucket = 0; | |
6e04e021 | 1958 | sk = sk_head(&tcp_hashinfo.listening_hash[0]); |
1da177e4 LT |
1959 | goto get_sk; |
1960 | } | |
1961 | ||
1962 | ++st->num; | |
1963 | ||
1964 | if (st->state == TCP_SEQ_STATE_OPENREQ) { | |
60236fdd | 1965 | struct request_sock *req = cur; |
1da177e4 | 1966 | |
72a3effa | 1967 | icsk = inet_csk(st->syn_wait_sk); |
1da177e4 LT |
1968 | req = req->dl_next; |
1969 | while (1) { | |
1970 | while (req) { | |
60236fdd | 1971 | if (req->rsk_ops->family == st->family) { |
1da177e4 LT |
1972 | cur = req; |
1973 | goto out; | |
1974 | } | |
1975 | req = req->dl_next; | |
1976 | } | |
72a3effa | 1977 | if (++st->sbucket >= icsk->icsk_accept_queue.listen_opt->nr_table_entries) |
1da177e4 LT |
1978 | break; |
1979 | get_req: | |
463c84b9 | 1980 | req = icsk->icsk_accept_queue.listen_opt->syn_table[st->sbucket]; |
1da177e4 LT |
1981 | } |
1982 | sk = sk_next(st->syn_wait_sk); | |
1983 | st->state = TCP_SEQ_STATE_LISTENING; | |
463c84b9 | 1984 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 | 1985 | } else { |
463c84b9 ACM |
1986 | icsk = inet_csk(sk); |
1987 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); | |
1988 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) | |
1da177e4 | 1989 | goto start_req; |
463c84b9 | 1990 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 LT |
1991 | sk = sk_next(sk); |
1992 | } | |
1993 | get_sk: | |
1994 | sk_for_each_from(sk, node) { | |
1995 | if (sk->sk_family == st->family) { | |
1996 | cur = sk; | |
1997 | goto out; | |
1998 | } | |
463c84b9 ACM |
1999 | icsk = inet_csk(sk); |
2000 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); | |
2001 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) { | |
1da177e4 LT |
2002 | start_req: |
2003 | st->uid = sock_i_uid(sk); | |
2004 | st->syn_wait_sk = sk; | |
2005 | st->state = TCP_SEQ_STATE_OPENREQ; | |
2006 | st->sbucket = 0; | |
2007 | goto get_req; | |
2008 | } | |
463c84b9 | 2009 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 | 2010 | } |
0f7ff927 | 2011 | if (++st->bucket < INET_LHTABLE_SIZE) { |
6e04e021 | 2012 | sk = sk_head(&tcp_hashinfo.listening_hash[st->bucket]); |
1da177e4 LT |
2013 | goto get_sk; |
2014 | } | |
2015 | cur = NULL; | |
2016 | out: | |
2017 | return cur; | |
2018 | } | |
2019 | ||
2020 | static void *listening_get_idx(struct seq_file *seq, loff_t *pos) | |
2021 | { | |
2022 | void *rc = listening_get_next(seq, NULL); | |
2023 | ||
2024 | while (rc && *pos) { | |
2025 | rc = listening_get_next(seq, rc); | |
2026 | --*pos; | |
2027 | } | |
2028 | return rc; | |
2029 | } | |
2030 | ||
2031 | static void *established_get_first(struct seq_file *seq) | |
2032 | { | |
2033 | struct tcp_iter_state* st = seq->private; | |
2034 | void *rc = NULL; | |
2035 | ||
6e04e021 | 2036 | for (st->bucket = 0; st->bucket < tcp_hashinfo.ehash_size; ++st->bucket) { |
1da177e4 LT |
2037 | struct sock *sk; |
2038 | struct hlist_node *node; | |
8feaf0c0 | 2039 | struct inet_timewait_sock *tw; |
1da177e4 LT |
2040 | |
2041 | /* We can reschedule _before_ having picked the target: */ | |
2042 | cond_resched_softirq(); | |
2043 | ||
6e04e021 ACM |
2044 | read_lock(&tcp_hashinfo.ehash[st->bucket].lock); |
2045 | sk_for_each(sk, node, &tcp_hashinfo.ehash[st->bucket].chain) { | |
1da177e4 LT |
2046 | if (sk->sk_family != st->family) { |
2047 | continue; | |
2048 | } | |
2049 | rc = sk; | |
2050 | goto out; | |
2051 | } | |
2052 | st->state = TCP_SEQ_STATE_TIME_WAIT; | |
8feaf0c0 ACM |
2053 | inet_twsk_for_each(tw, node, |
2054 | &tcp_hashinfo.ehash[st->bucket + tcp_hashinfo.ehash_size].chain) { | |
1da177e4 LT |
2055 | if (tw->tw_family != st->family) { |
2056 | continue; | |
2057 | } | |
2058 | rc = tw; | |
2059 | goto out; | |
2060 | } | |
6e04e021 | 2061 | read_unlock(&tcp_hashinfo.ehash[st->bucket].lock); |
1da177e4 LT |
2062 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
2063 | } | |
2064 | out: | |
2065 | return rc; | |
2066 | } | |
2067 | ||
2068 | static void *established_get_next(struct seq_file *seq, void *cur) | |
2069 | { | |
2070 | struct sock *sk = cur; | |
8feaf0c0 | 2071 | struct inet_timewait_sock *tw; |
1da177e4 LT |
2072 | struct hlist_node *node; |
2073 | struct tcp_iter_state* st = seq->private; | |
2074 | ||
2075 | ++st->num; | |
2076 | ||
2077 | if (st->state == TCP_SEQ_STATE_TIME_WAIT) { | |
2078 | tw = cur; | |
2079 | tw = tw_next(tw); | |
2080 | get_tw: | |
2081 | while (tw && tw->tw_family != st->family) { | |
2082 | tw = tw_next(tw); | |
2083 | } | |
2084 | if (tw) { | |
2085 | cur = tw; | |
2086 | goto out; | |
2087 | } | |
6e04e021 | 2088 | read_unlock(&tcp_hashinfo.ehash[st->bucket].lock); |
1da177e4 LT |
2089 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
2090 | ||
2091 | /* We can reschedule between buckets: */ | |
2092 | cond_resched_softirq(); | |
2093 | ||
6e04e021 ACM |
2094 | if (++st->bucket < tcp_hashinfo.ehash_size) { |
2095 | read_lock(&tcp_hashinfo.ehash[st->bucket].lock); | |
2096 | sk = sk_head(&tcp_hashinfo.ehash[st->bucket].chain); | |
1da177e4 LT |
2097 | } else { |
2098 | cur = NULL; | |
2099 | goto out; | |
2100 | } | |
2101 | } else | |
2102 | sk = sk_next(sk); | |
2103 | ||
2104 | sk_for_each_from(sk, node) { | |
2105 | if (sk->sk_family == st->family) | |
2106 | goto found; | |
2107 | } | |
2108 | ||
2109 | st->state = TCP_SEQ_STATE_TIME_WAIT; | |
6e04e021 | 2110 | tw = tw_head(&tcp_hashinfo.ehash[st->bucket + tcp_hashinfo.ehash_size].chain); |
1da177e4 LT |
2111 | goto get_tw; |
2112 | found: | |
2113 | cur = sk; | |
2114 | out: | |
2115 | return cur; | |
2116 | } | |
2117 | ||
2118 | static void *established_get_idx(struct seq_file *seq, loff_t pos) | |
2119 | { | |
2120 | void *rc = established_get_first(seq); | |
2121 | ||
2122 | while (rc && pos) { | |
2123 | rc = established_get_next(seq, rc); | |
2124 | --pos; | |
7174259e | 2125 | } |
1da177e4 LT |
2126 | return rc; |
2127 | } | |
2128 | ||
2129 | static void *tcp_get_idx(struct seq_file *seq, loff_t pos) | |
2130 | { | |
2131 | void *rc; | |
2132 | struct tcp_iter_state* st = seq->private; | |
2133 | ||
f3f05f70 | 2134 | inet_listen_lock(&tcp_hashinfo); |
1da177e4 LT |
2135 | st->state = TCP_SEQ_STATE_LISTENING; |
2136 | rc = listening_get_idx(seq, &pos); | |
2137 | ||
2138 | if (!rc) { | |
f3f05f70 | 2139 | inet_listen_unlock(&tcp_hashinfo); |
1da177e4 LT |
2140 | local_bh_disable(); |
2141 | st->state = TCP_SEQ_STATE_ESTABLISHED; | |
2142 | rc = established_get_idx(seq, pos); | |
2143 | } | |
2144 | ||
2145 | return rc; | |
2146 | } | |
2147 | ||
2148 | static void *tcp_seq_start(struct seq_file *seq, loff_t *pos) | |
2149 | { | |
2150 | struct tcp_iter_state* st = seq->private; | |
2151 | st->state = TCP_SEQ_STATE_LISTENING; | |
2152 | st->num = 0; | |
2153 | return *pos ? tcp_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
2154 | } | |
2155 | ||
2156 | static void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2157 | { | |
2158 | void *rc = NULL; | |
2159 | struct tcp_iter_state* st; | |
2160 | ||
2161 | if (v == SEQ_START_TOKEN) { | |
2162 | rc = tcp_get_idx(seq, 0); | |
2163 | goto out; | |
2164 | } | |
2165 | st = seq->private; | |
2166 | ||
2167 | switch (st->state) { | |
2168 | case TCP_SEQ_STATE_OPENREQ: | |
2169 | case TCP_SEQ_STATE_LISTENING: | |
2170 | rc = listening_get_next(seq, v); | |
2171 | if (!rc) { | |
f3f05f70 | 2172 | inet_listen_unlock(&tcp_hashinfo); |
1da177e4 LT |
2173 | local_bh_disable(); |
2174 | st->state = TCP_SEQ_STATE_ESTABLISHED; | |
2175 | rc = established_get_first(seq); | |
2176 | } | |
2177 | break; | |
2178 | case TCP_SEQ_STATE_ESTABLISHED: | |
2179 | case TCP_SEQ_STATE_TIME_WAIT: | |
2180 | rc = established_get_next(seq, v); | |
2181 | break; | |
2182 | } | |
2183 | out: | |
2184 | ++*pos; | |
2185 | return rc; | |
2186 | } | |
2187 | ||
2188 | static void tcp_seq_stop(struct seq_file *seq, void *v) | |
2189 | { | |
2190 | struct tcp_iter_state* st = seq->private; | |
2191 | ||
2192 | switch (st->state) { | |
2193 | case TCP_SEQ_STATE_OPENREQ: | |
2194 | if (v) { | |
463c84b9 ACM |
2195 | struct inet_connection_sock *icsk = inet_csk(st->syn_wait_sk); |
2196 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); | |
1da177e4 LT |
2197 | } |
2198 | case TCP_SEQ_STATE_LISTENING: | |
2199 | if (v != SEQ_START_TOKEN) | |
f3f05f70 | 2200 | inet_listen_unlock(&tcp_hashinfo); |
1da177e4 LT |
2201 | break; |
2202 | case TCP_SEQ_STATE_TIME_WAIT: | |
2203 | case TCP_SEQ_STATE_ESTABLISHED: | |
2204 | if (v) | |
6e04e021 | 2205 | read_unlock(&tcp_hashinfo.ehash[st->bucket].lock); |
1da177e4 LT |
2206 | local_bh_enable(); |
2207 | break; | |
2208 | } | |
2209 | } | |
2210 | ||
2211 | static int tcp_seq_open(struct inode *inode, struct file *file) | |
2212 | { | |
2213 | struct tcp_seq_afinfo *afinfo = PDE(inode)->data; | |
2214 | struct seq_file *seq; | |
2215 | struct tcp_iter_state *s; | |
2216 | int rc; | |
2217 | ||
2218 | if (unlikely(afinfo == NULL)) | |
2219 | return -EINVAL; | |
2220 | ||
0da974f4 | 2221 | s = kzalloc(sizeof(*s), GFP_KERNEL); |
1da177e4 LT |
2222 | if (!s) |
2223 | return -ENOMEM; | |
1da177e4 LT |
2224 | s->family = afinfo->family; |
2225 | s->seq_ops.start = tcp_seq_start; | |
2226 | s->seq_ops.next = tcp_seq_next; | |
2227 | s->seq_ops.show = afinfo->seq_show; | |
2228 | s->seq_ops.stop = tcp_seq_stop; | |
2229 | ||
2230 | rc = seq_open(file, &s->seq_ops); | |
2231 | if (rc) | |
2232 | goto out_kfree; | |
2233 | seq = file->private_data; | |
2234 | seq->private = s; | |
2235 | out: | |
2236 | return rc; | |
2237 | out_kfree: | |
2238 | kfree(s); | |
2239 | goto out; | |
2240 | } | |
2241 | ||
2242 | int tcp_proc_register(struct tcp_seq_afinfo *afinfo) | |
2243 | { | |
2244 | int rc = 0; | |
2245 | struct proc_dir_entry *p; | |
2246 | ||
2247 | if (!afinfo) | |
2248 | return -EINVAL; | |
2249 | afinfo->seq_fops->owner = afinfo->owner; | |
2250 | afinfo->seq_fops->open = tcp_seq_open; | |
2251 | afinfo->seq_fops->read = seq_read; | |
2252 | afinfo->seq_fops->llseek = seq_lseek; | |
2253 | afinfo->seq_fops->release = seq_release_private; | |
7174259e | 2254 | |
1da177e4 LT |
2255 | p = proc_net_fops_create(afinfo->name, S_IRUGO, afinfo->seq_fops); |
2256 | if (p) | |
2257 | p->data = afinfo; | |
2258 | else | |
2259 | rc = -ENOMEM; | |
2260 | return rc; | |
2261 | } | |
2262 | ||
2263 | void tcp_proc_unregister(struct tcp_seq_afinfo *afinfo) | |
2264 | { | |
2265 | if (!afinfo) | |
2266 | return; | |
2267 | proc_net_remove(afinfo->name); | |
7174259e | 2268 | memset(afinfo->seq_fops, 0, sizeof(*afinfo->seq_fops)); |
1da177e4 LT |
2269 | } |
2270 | ||
60236fdd | 2271 | static void get_openreq4(struct sock *sk, struct request_sock *req, |
1da177e4 LT |
2272 | char *tmpbuf, int i, int uid) |
2273 | { | |
2e6599cb | 2274 | const struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 LT |
2275 | int ttd = req->expires - jiffies; |
2276 | ||
2277 | sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X" | |
2278 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %u %d %p", | |
2279 | i, | |
2e6599cb | 2280 | ireq->loc_addr, |
1da177e4 | 2281 | ntohs(inet_sk(sk)->sport), |
2e6599cb ACM |
2282 | ireq->rmt_addr, |
2283 | ntohs(ireq->rmt_port), | |
1da177e4 LT |
2284 | TCP_SYN_RECV, |
2285 | 0, 0, /* could print option size, but that is af dependent. */ | |
2286 | 1, /* timers active (only the expire timer) */ | |
2287 | jiffies_to_clock_t(ttd), | |
2288 | req->retrans, | |
2289 | uid, | |
2290 | 0, /* non standard timer */ | |
2291 | 0, /* open_requests have no inode */ | |
2292 | atomic_read(&sk->sk_refcnt), | |
2293 | req); | |
2294 | } | |
2295 | ||
2296 | static void get_tcp4_sock(struct sock *sp, char *tmpbuf, int i) | |
2297 | { | |
2298 | int timer_active; | |
2299 | unsigned long timer_expires; | |
2300 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 2301 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 | 2302 | struct inet_sock *inet = inet_sk(sp); |
714e85be AV |
2303 | __be32 dest = inet->daddr; |
2304 | __be32 src = inet->rcv_saddr; | |
1da177e4 LT |
2305 | __u16 destp = ntohs(inet->dport); |
2306 | __u16 srcp = ntohs(inet->sport); | |
2307 | ||
463c84b9 | 2308 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
1da177e4 | 2309 | timer_active = 1; |
463c84b9 ACM |
2310 | timer_expires = icsk->icsk_timeout; |
2311 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 2312 | timer_active = 4; |
463c84b9 | 2313 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
2314 | } else if (timer_pending(&sp->sk_timer)) { |
2315 | timer_active = 2; | |
2316 | timer_expires = sp->sk_timer.expires; | |
2317 | } else { | |
2318 | timer_active = 0; | |
2319 | timer_expires = jiffies; | |
2320 | } | |
2321 | ||
2322 | sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X %02X %08X:%08X %02X:%08lX " | |
2323 | "%08X %5d %8d %lu %d %p %u %u %u %u %d", | |
2324 | i, src, srcp, dest, destp, sp->sk_state, | |
47da8ee6 | 2325 | tp->write_seq - tp->snd_una, |
7174259e ACM |
2326 | sp->sk_state == TCP_LISTEN ? sp->sk_ack_backlog : |
2327 | (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 LT |
2328 | timer_active, |
2329 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 2330 | icsk->icsk_retransmits, |
1da177e4 | 2331 | sock_i_uid(sp), |
6687e988 | 2332 | icsk->icsk_probes_out, |
1da177e4 LT |
2333 | sock_i_ino(sp), |
2334 | atomic_read(&sp->sk_refcnt), sp, | |
463c84b9 ACM |
2335 | icsk->icsk_rto, |
2336 | icsk->icsk_ack.ato, | |
2337 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, | |
1da177e4 LT |
2338 | tp->snd_cwnd, |
2339 | tp->snd_ssthresh >= 0xFFFF ? -1 : tp->snd_ssthresh); | |
2340 | } | |
2341 | ||
7174259e ACM |
2342 | static void get_timewait4_sock(struct inet_timewait_sock *tw, |
2343 | char *tmpbuf, int i) | |
1da177e4 | 2344 | { |
23f33c2d | 2345 | __be32 dest, src; |
1da177e4 LT |
2346 | __u16 destp, srcp; |
2347 | int ttd = tw->tw_ttd - jiffies; | |
2348 | ||
2349 | if (ttd < 0) | |
2350 | ttd = 0; | |
2351 | ||
2352 | dest = tw->tw_daddr; | |
2353 | src = tw->tw_rcv_saddr; | |
2354 | destp = ntohs(tw->tw_dport); | |
2355 | srcp = ntohs(tw->tw_sport); | |
2356 | ||
2357 | sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X" | |
2358 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p", | |
2359 | i, src, srcp, dest, destp, tw->tw_substate, 0, 0, | |
2360 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2361 | atomic_read(&tw->tw_refcnt), tw); | |
2362 | } | |
2363 | ||
2364 | #define TMPSZ 150 | |
2365 | ||
2366 | static int tcp4_seq_show(struct seq_file *seq, void *v) | |
2367 | { | |
2368 | struct tcp_iter_state* st; | |
2369 | char tmpbuf[TMPSZ + 1]; | |
2370 | ||
2371 | if (v == SEQ_START_TOKEN) { | |
2372 | seq_printf(seq, "%-*s\n", TMPSZ - 1, | |
2373 | " sl local_address rem_address st tx_queue " | |
2374 | "rx_queue tr tm->when retrnsmt uid timeout " | |
2375 | "inode"); | |
2376 | goto out; | |
2377 | } | |
2378 | st = seq->private; | |
2379 | ||
2380 | switch (st->state) { | |
2381 | case TCP_SEQ_STATE_LISTENING: | |
2382 | case TCP_SEQ_STATE_ESTABLISHED: | |
2383 | get_tcp4_sock(v, tmpbuf, st->num); | |
2384 | break; | |
2385 | case TCP_SEQ_STATE_OPENREQ: | |
2386 | get_openreq4(st->syn_wait_sk, v, tmpbuf, st->num, st->uid); | |
2387 | break; | |
2388 | case TCP_SEQ_STATE_TIME_WAIT: | |
2389 | get_timewait4_sock(v, tmpbuf, st->num); | |
2390 | break; | |
2391 | } | |
2392 | seq_printf(seq, "%-*s\n", TMPSZ - 1, tmpbuf); | |
2393 | out: | |
2394 | return 0; | |
2395 | } | |
2396 | ||
2397 | static struct file_operations tcp4_seq_fops; | |
2398 | static struct tcp_seq_afinfo tcp4_seq_afinfo = { | |
2399 | .owner = THIS_MODULE, | |
2400 | .name = "tcp", | |
2401 | .family = AF_INET, | |
2402 | .seq_show = tcp4_seq_show, | |
2403 | .seq_fops = &tcp4_seq_fops, | |
2404 | }; | |
2405 | ||
2406 | int __init tcp4_proc_init(void) | |
2407 | { | |
2408 | return tcp_proc_register(&tcp4_seq_afinfo); | |
2409 | } | |
2410 | ||
2411 | void tcp4_proc_exit(void) | |
2412 | { | |
2413 | tcp_proc_unregister(&tcp4_seq_afinfo); | |
2414 | } | |
2415 | #endif /* CONFIG_PROC_FS */ | |
2416 | ||
2417 | struct proto tcp_prot = { | |
2418 | .name = "TCP", | |
2419 | .owner = THIS_MODULE, | |
2420 | .close = tcp_close, | |
2421 | .connect = tcp_v4_connect, | |
2422 | .disconnect = tcp_disconnect, | |
463c84b9 | 2423 | .accept = inet_csk_accept, |
1da177e4 LT |
2424 | .ioctl = tcp_ioctl, |
2425 | .init = tcp_v4_init_sock, | |
2426 | .destroy = tcp_v4_destroy_sock, | |
2427 | .shutdown = tcp_shutdown, | |
2428 | .setsockopt = tcp_setsockopt, | |
2429 | .getsockopt = tcp_getsockopt, | |
2430 | .sendmsg = tcp_sendmsg, | |
2431 | .recvmsg = tcp_recvmsg, | |
2432 | .backlog_rcv = tcp_v4_do_rcv, | |
2433 | .hash = tcp_v4_hash, | |
2434 | .unhash = tcp_unhash, | |
2435 | .get_port = tcp_v4_get_port, | |
2436 | .enter_memory_pressure = tcp_enter_memory_pressure, | |
2437 | .sockets_allocated = &tcp_sockets_allocated, | |
0a5578cf | 2438 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2439 | .memory_allocated = &tcp_memory_allocated, |
2440 | .memory_pressure = &tcp_memory_pressure, | |
2441 | .sysctl_mem = sysctl_tcp_mem, | |
2442 | .sysctl_wmem = sysctl_tcp_wmem, | |
2443 | .sysctl_rmem = sysctl_tcp_rmem, | |
2444 | .max_header = MAX_TCP_HEADER, | |
2445 | .obj_size = sizeof(struct tcp_sock), | |
6d6ee43e | 2446 | .twsk_prot = &tcp_timewait_sock_ops, |
60236fdd | 2447 | .rsk_prot = &tcp_request_sock_ops, |
543d9cfe ACM |
2448 | #ifdef CONFIG_COMPAT |
2449 | .compat_setsockopt = compat_tcp_setsockopt, | |
2450 | .compat_getsockopt = compat_tcp_getsockopt, | |
2451 | #endif | |
1da177e4 LT |
2452 | }; |
2453 | ||
1da177e4 LT |
2454 | void __init tcp_v4_init(struct net_proto_family *ops) |
2455 | { | |
7174259e ACM |
2456 | if (inet_csk_ctl_sock_create(&tcp_socket, PF_INET, SOCK_RAW, |
2457 | IPPROTO_TCP) < 0) | |
1da177e4 | 2458 | panic("Failed to create the TCP control socket.\n"); |
1da177e4 LT |
2459 | } |
2460 | ||
2461 | EXPORT_SYMBOL(ipv4_specific); | |
1da177e4 | 2462 | EXPORT_SYMBOL(tcp_hashinfo); |
1da177e4 | 2463 | EXPORT_SYMBOL(tcp_prot); |
1da177e4 LT |
2464 | EXPORT_SYMBOL(tcp_unhash); |
2465 | EXPORT_SYMBOL(tcp_v4_conn_request); | |
2466 | EXPORT_SYMBOL(tcp_v4_connect); | |
2467 | EXPORT_SYMBOL(tcp_v4_do_rcv); | |
1da177e4 LT |
2468 | EXPORT_SYMBOL(tcp_v4_remember_stamp); |
2469 | EXPORT_SYMBOL(tcp_v4_send_check); | |
2470 | EXPORT_SYMBOL(tcp_v4_syn_recv_sock); | |
2471 | ||
2472 | #ifdef CONFIG_PROC_FS | |
2473 | EXPORT_SYMBOL(tcp_proc_register); | |
2474 | EXPORT_SYMBOL(tcp_proc_unregister); | |
2475 | #endif | |
2476 | EXPORT_SYMBOL(sysctl_local_port_range); | |
1da177e4 | 2477 | EXPORT_SYMBOL(sysctl_tcp_low_latency); |
1da177e4 | 2478 |