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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 | ||
457c4cbc | 65 | #include <net/net_namespace.h> |
1da177e4 | 66 | #include <net/icmp.h> |
304a1618 | 67 | #include <net/inet_hashtables.h> |
1da177e4 | 68 | #include <net/tcp.h> |
20380731 | 69 | #include <net/transp_v6.h> |
1da177e4 LT |
70 | #include <net/ipv6.h> |
71 | #include <net/inet_common.h> | |
6d6ee43e | 72 | #include <net/timewait_sock.h> |
1da177e4 | 73 | #include <net/xfrm.h> |
1a2449a8 | 74 | #include <net/netdma.h> |
1da177e4 LT |
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 | ||
cfb6eeb4 YH |
82 | #include <linux/crypto.h> |
83 | #include <linux/scatterlist.h> | |
84 | ||
ab32ea5d BH |
85 | int sysctl_tcp_tw_reuse __read_mostly; |
86 | int sysctl_tcp_low_latency __read_mostly; | |
1da177e4 | 87 | |
1da177e4 | 88 | |
cfb6eeb4 | 89 | #ifdef CONFIG_TCP_MD5SIG |
7174259e ACM |
90 | static struct tcp_md5sig_key *tcp_v4_md5_do_lookup(struct sock *sk, |
91 | __be32 addr); | |
cfb6eeb4 | 92 | static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, |
7174259e ACM |
93 | __be32 saddr, __be32 daddr, |
94 | struct tcphdr *th, int protocol, | |
9cb5734e | 95 | unsigned int tcplen); |
cfb6eeb4 YH |
96 | #endif |
97 | ||
0f7ff927 | 98 | struct inet_hashinfo __cacheline_aligned tcp_hashinfo = { |
7174259e ACM |
99 | .lhash_lock = __RW_LOCK_UNLOCKED(tcp_hashinfo.lhash_lock), |
100 | .lhash_users = ATOMIC_INIT(0), | |
101 | .lhash_wait = __WAIT_QUEUE_HEAD_INITIALIZER(tcp_hashinfo.lhash_wait), | |
1da177e4 LT |
102 | }; |
103 | ||
a94f723d | 104 | static inline __u32 tcp_v4_init_sequence(struct sk_buff *skb) |
1da177e4 | 105 | { |
eddc9ec5 ACM |
106 | return secure_tcp_sequence_number(ip_hdr(skb)->daddr, |
107 | ip_hdr(skb)->saddr, | |
aa8223c7 ACM |
108 | tcp_hdr(skb)->dest, |
109 | tcp_hdr(skb)->source); | |
1da177e4 LT |
110 | } |
111 | ||
6d6ee43e ACM |
112 | int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp) |
113 | { | |
114 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sktw); | |
115 | struct tcp_sock *tp = tcp_sk(sk); | |
116 | ||
117 | /* With PAWS, it is safe from the viewpoint | |
118 | of data integrity. Even without PAWS it is safe provided sequence | |
119 | spaces do not overlap i.e. at data rates <= 80Mbit/sec. | |
120 | ||
121 | Actually, the idea is close to VJ's one, only timestamp cache is | |
122 | held not per host, but per port pair and TW bucket is used as state | |
123 | holder. | |
124 | ||
125 | If TW bucket has been already destroyed we fall back to VJ's scheme | |
126 | and use initial timestamp retrieved from peer table. | |
127 | */ | |
128 | if (tcptw->tw_ts_recent_stamp && | |
129 | (twp == NULL || (sysctl_tcp_tw_reuse && | |
9d729f72 | 130 | get_seconds() - tcptw->tw_ts_recent_stamp > 1))) { |
6d6ee43e ACM |
131 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; |
132 | if (tp->write_seq == 0) | |
133 | tp->write_seq = 1; | |
134 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; | |
135 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; | |
136 | sock_hold(sktw); | |
137 | return 1; | |
138 | } | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | EXPORT_SYMBOL_GPL(tcp_twsk_unique); | |
144 | ||
1da177e4 LT |
145 | /* This will initiate an outgoing connection. */ |
146 | int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
147 | { | |
148 | struct inet_sock *inet = inet_sk(sk); | |
149 | struct tcp_sock *tp = tcp_sk(sk); | |
150 | struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; | |
151 | struct rtable *rt; | |
bada8adc | 152 | __be32 daddr, nexthop; |
1da177e4 LT |
153 | int tmp; |
154 | int err; | |
155 | ||
156 | if (addr_len < sizeof(struct sockaddr_in)) | |
157 | return -EINVAL; | |
158 | ||
159 | if (usin->sin_family != AF_INET) | |
160 | return -EAFNOSUPPORT; | |
161 | ||
162 | nexthop = daddr = usin->sin_addr.s_addr; | |
163 | if (inet->opt && inet->opt->srr) { | |
164 | if (!daddr) | |
165 | return -EINVAL; | |
166 | nexthop = inet->opt->faddr; | |
167 | } | |
168 | ||
169 | tmp = ip_route_connect(&rt, nexthop, inet->saddr, | |
170 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, | |
171 | IPPROTO_TCP, | |
8eb9086f | 172 | inet->sport, usin->sin_port, sk, 1); |
584bdf8c WD |
173 | if (tmp < 0) { |
174 | if (tmp == -ENETUNREACH) | |
175 | IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); | |
1da177e4 | 176 | return tmp; |
584bdf8c | 177 | } |
1da177e4 LT |
178 | |
179 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { | |
180 | ip_rt_put(rt); | |
181 | return -ENETUNREACH; | |
182 | } | |
183 | ||
184 | if (!inet->opt || !inet->opt->srr) | |
185 | daddr = rt->rt_dst; | |
186 | ||
187 | if (!inet->saddr) | |
188 | inet->saddr = rt->rt_src; | |
189 | inet->rcv_saddr = inet->saddr; | |
190 | ||
191 | if (tp->rx_opt.ts_recent_stamp && inet->daddr != daddr) { | |
192 | /* Reset inherited state */ | |
193 | tp->rx_opt.ts_recent = 0; | |
194 | tp->rx_opt.ts_recent_stamp = 0; | |
195 | tp->write_seq = 0; | |
196 | } | |
197 | ||
295ff7ed | 198 | if (tcp_death_row.sysctl_tw_recycle && |
1da177e4 LT |
199 | !tp->rx_opt.ts_recent_stamp && rt->rt_dst == daddr) { |
200 | struct inet_peer *peer = rt_get_peer(rt); | |
7174259e ACM |
201 | /* |
202 | * VJ's idea. We save last timestamp seen from | |
203 | * the destination in peer table, when entering state | |
204 | * TIME-WAIT * and initialize rx_opt.ts_recent from it, | |
205 | * when trying new connection. | |
1da177e4 | 206 | */ |
7174259e | 207 | if (peer != NULL && |
9d729f72 | 208 | peer->tcp_ts_stamp + TCP_PAWS_MSL >= get_seconds()) { |
1da177e4 LT |
209 | tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp; |
210 | tp->rx_opt.ts_recent = peer->tcp_ts; | |
211 | } | |
212 | } | |
213 | ||
214 | inet->dport = usin->sin_port; | |
215 | inet->daddr = daddr; | |
216 | ||
d83d8461 | 217 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
1da177e4 | 218 | if (inet->opt) |
d83d8461 | 219 | inet_csk(sk)->icsk_ext_hdr_len = inet->opt->optlen; |
1da177e4 LT |
220 | |
221 | tp->rx_opt.mss_clamp = 536; | |
222 | ||
223 | /* Socket identity is still unknown (sport may be zero). | |
224 | * However we set state to SYN-SENT and not releasing socket | |
225 | * lock select source port, enter ourselves into the hash tables and | |
226 | * complete initialization after this. | |
227 | */ | |
228 | tcp_set_state(sk, TCP_SYN_SENT); | |
a7f5e7f1 | 229 | err = inet_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
230 | if (err) |
231 | goto failure; | |
232 | ||
7174259e ACM |
233 | err = ip_route_newports(&rt, IPPROTO_TCP, |
234 | inet->sport, inet->dport, sk); | |
1da177e4 LT |
235 | if (err) |
236 | goto failure; | |
237 | ||
238 | /* OK, now commit destination to socket. */ | |
bcd76111 | 239 | sk->sk_gso_type = SKB_GSO_TCPV4; |
6cbb0df7 | 240 | sk_setup_caps(sk, &rt->u.dst); |
1da177e4 LT |
241 | |
242 | if (!tp->write_seq) | |
243 | tp->write_seq = secure_tcp_sequence_number(inet->saddr, | |
244 | inet->daddr, | |
245 | inet->sport, | |
246 | usin->sin_port); | |
247 | ||
248 | inet->id = tp->write_seq ^ jiffies; | |
249 | ||
250 | err = tcp_connect(sk); | |
251 | rt = NULL; | |
252 | if (err) | |
253 | goto failure; | |
254 | ||
255 | return 0; | |
256 | ||
257 | failure: | |
7174259e ACM |
258 | /* |
259 | * This unhashes the socket and releases the local port, | |
260 | * if necessary. | |
261 | */ | |
1da177e4 LT |
262 | tcp_set_state(sk, TCP_CLOSE); |
263 | ip_rt_put(rt); | |
264 | sk->sk_route_caps = 0; | |
265 | inet->dport = 0; | |
266 | return err; | |
267 | } | |
268 | ||
1da177e4 LT |
269 | /* |
270 | * This routine does path mtu discovery as defined in RFC1191. | |
271 | */ | |
40efc6fa | 272 | static void do_pmtu_discovery(struct sock *sk, struct iphdr *iph, u32 mtu) |
1da177e4 LT |
273 | { |
274 | struct dst_entry *dst; | |
275 | struct inet_sock *inet = inet_sk(sk); | |
1da177e4 LT |
276 | |
277 | /* We are not interested in TCP_LISTEN and open_requests (SYN-ACKs | |
278 | * send out by Linux are always <576bytes so they should go through | |
279 | * unfragmented). | |
280 | */ | |
281 | if (sk->sk_state == TCP_LISTEN) | |
282 | return; | |
283 | ||
284 | /* We don't check in the destentry if pmtu discovery is forbidden | |
285 | * on this route. We just assume that no packet_to_big packets | |
286 | * are send back when pmtu discovery is not active. | |
e905a9ed | 287 | * There is a small race when the user changes this flag in the |
1da177e4 LT |
288 | * route, but I think that's acceptable. |
289 | */ | |
290 | if ((dst = __sk_dst_check(sk, 0)) == NULL) | |
291 | return; | |
292 | ||
293 | dst->ops->update_pmtu(dst, mtu); | |
294 | ||
295 | /* Something is about to be wrong... Remember soft error | |
296 | * for the case, if this connection will not able to recover. | |
297 | */ | |
298 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) | |
299 | sk->sk_err_soft = EMSGSIZE; | |
300 | ||
301 | mtu = dst_mtu(dst); | |
302 | ||
303 | if (inet->pmtudisc != IP_PMTUDISC_DONT && | |
d83d8461 | 304 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
1da177e4 LT |
305 | tcp_sync_mss(sk, mtu); |
306 | ||
307 | /* Resend the TCP packet because it's | |
308 | * clear that the old packet has been | |
309 | * dropped. This is the new "fast" path mtu | |
310 | * discovery. | |
311 | */ | |
312 | tcp_simple_retransmit(sk); | |
313 | } /* else let the usual retransmit timer handle it */ | |
314 | } | |
315 | ||
316 | /* | |
317 | * This routine is called by the ICMP module when it gets some | |
318 | * sort of error condition. If err < 0 then the socket should | |
319 | * be closed and the error returned to the user. If err > 0 | |
320 | * it's just the icmp type << 8 | icmp code. After adjustment | |
321 | * header points to the first 8 bytes of the tcp header. We need | |
322 | * to find the appropriate port. | |
323 | * | |
324 | * The locking strategy used here is very "optimistic". When | |
325 | * someone else accesses the socket the ICMP is just dropped | |
326 | * and for some paths there is no check at all. | |
327 | * A more general error queue to queue errors for later handling | |
328 | * is probably better. | |
329 | * | |
330 | */ | |
331 | ||
332 | void tcp_v4_err(struct sk_buff *skb, u32 info) | |
333 | { | |
334 | struct iphdr *iph = (struct iphdr *)skb->data; | |
335 | struct tcphdr *th = (struct tcphdr *)(skb->data + (iph->ihl << 2)); | |
336 | struct tcp_sock *tp; | |
337 | struct inet_sock *inet; | |
88c7664f ACM |
338 | const int type = icmp_hdr(skb)->type; |
339 | const int code = icmp_hdr(skb)->code; | |
1da177e4 LT |
340 | struct sock *sk; |
341 | __u32 seq; | |
342 | int err; | |
343 | ||
344 | if (skb->len < (iph->ihl << 2) + 8) { | |
345 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
346 | return; | |
347 | } | |
348 | ||
c346dca1 | 349 | sk = inet_lookup(dev_net(skb->dev), &tcp_hashinfo, iph->daddr, th->dest, |
c67499c0 | 350 | iph->saddr, th->source, inet_iif(skb)); |
1da177e4 LT |
351 | if (!sk) { |
352 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
353 | return; | |
354 | } | |
355 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 356 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
357 | return; |
358 | } | |
359 | ||
360 | bh_lock_sock(sk); | |
361 | /* If too many ICMPs get dropped on busy | |
362 | * servers this needs to be solved differently. | |
363 | */ | |
364 | if (sock_owned_by_user(sk)) | |
365 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
366 | ||
367 | if (sk->sk_state == TCP_CLOSE) | |
368 | goto out; | |
369 | ||
370 | tp = tcp_sk(sk); | |
371 | seq = ntohl(th->seq); | |
372 | if (sk->sk_state != TCP_LISTEN && | |
373 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
06ca719f | 374 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
375 | goto out; |
376 | } | |
377 | ||
378 | switch (type) { | |
379 | case ICMP_SOURCE_QUENCH: | |
380 | /* Just silently ignore these. */ | |
381 | goto out; | |
382 | case ICMP_PARAMETERPROB: | |
383 | err = EPROTO; | |
384 | break; | |
385 | case ICMP_DEST_UNREACH: | |
386 | if (code > NR_ICMP_UNREACH) | |
387 | goto out; | |
388 | ||
389 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ | |
390 | if (!sock_owned_by_user(sk)) | |
391 | do_pmtu_discovery(sk, iph, info); | |
392 | goto out; | |
393 | } | |
394 | ||
395 | err = icmp_err_convert[code].errno; | |
396 | break; | |
397 | case ICMP_TIME_EXCEEDED: | |
398 | err = EHOSTUNREACH; | |
399 | break; | |
400 | default: | |
401 | goto out; | |
402 | } | |
403 | ||
404 | switch (sk->sk_state) { | |
60236fdd | 405 | struct request_sock *req, **prev; |
1da177e4 LT |
406 | case TCP_LISTEN: |
407 | if (sock_owned_by_user(sk)) | |
408 | goto out; | |
409 | ||
463c84b9 ACM |
410 | req = inet_csk_search_req(sk, &prev, th->dest, |
411 | iph->daddr, iph->saddr); | |
1da177e4 LT |
412 | if (!req) |
413 | goto out; | |
414 | ||
415 | /* ICMPs are not backlogged, hence we cannot get | |
416 | an established socket here. | |
417 | */ | |
418 | BUG_TRAP(!req->sk); | |
419 | ||
2e6599cb | 420 | if (seq != tcp_rsk(req)->snt_isn) { |
1da177e4 LT |
421 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
422 | goto out; | |
423 | } | |
424 | ||
425 | /* | |
426 | * Still in SYN_RECV, just remove it silently. | |
427 | * There is no good way to pass the error to the newly | |
428 | * created socket, and POSIX does not want network | |
429 | * errors returned from accept(). | |
430 | */ | |
463c84b9 | 431 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
432 | goto out; |
433 | ||
434 | case TCP_SYN_SENT: | |
435 | case TCP_SYN_RECV: /* Cannot happen. | |
436 | It can f.e. if SYNs crossed. | |
437 | */ | |
438 | if (!sock_owned_by_user(sk)) { | |
1da177e4 LT |
439 | sk->sk_err = err; |
440 | ||
441 | sk->sk_error_report(sk); | |
442 | ||
443 | tcp_done(sk); | |
444 | } else { | |
445 | sk->sk_err_soft = err; | |
446 | } | |
447 | goto out; | |
448 | } | |
449 | ||
450 | /* If we've already connected we will keep trying | |
451 | * until we time out, or the user gives up. | |
452 | * | |
453 | * rfc1122 4.2.3.9 allows to consider as hard errors | |
454 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, | |
455 | * but it is obsoleted by pmtu discovery). | |
456 | * | |
457 | * Note, that in modern internet, where routing is unreliable | |
458 | * and in each dark corner broken firewalls sit, sending random | |
459 | * errors ordered by their masters even this two messages finally lose | |
460 | * their original sense (even Linux sends invalid PORT_UNREACHs) | |
461 | * | |
462 | * Now we are in compliance with RFCs. | |
463 | * --ANK (980905) | |
464 | */ | |
465 | ||
466 | inet = inet_sk(sk); | |
467 | if (!sock_owned_by_user(sk) && inet->recverr) { | |
468 | sk->sk_err = err; | |
469 | sk->sk_error_report(sk); | |
470 | } else { /* Only an error on timeout */ | |
471 | sk->sk_err_soft = err; | |
472 | } | |
473 | ||
474 | out: | |
475 | bh_unlock_sock(sk); | |
476 | sock_put(sk); | |
477 | } | |
478 | ||
479 | /* This routine computes an IPv4 TCP checksum. */ | |
8292a17a | 480 | void tcp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb) |
1da177e4 LT |
481 | { |
482 | struct inet_sock *inet = inet_sk(sk); | |
aa8223c7 | 483 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 484 | |
84fa7933 | 485 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
ba7808ea FD |
486 | th->check = ~tcp_v4_check(len, inet->saddr, |
487 | inet->daddr, 0); | |
663ead3b | 488 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 489 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 490 | } else { |
ba7808ea | 491 | th->check = tcp_v4_check(len, inet->saddr, inet->daddr, |
1da177e4 LT |
492 | csum_partial((char *)th, |
493 | th->doff << 2, | |
494 | skb->csum)); | |
495 | } | |
496 | } | |
497 | ||
a430a43d HX |
498 | int tcp_v4_gso_send_check(struct sk_buff *skb) |
499 | { | |
eddc9ec5 | 500 | const struct iphdr *iph; |
a430a43d HX |
501 | struct tcphdr *th; |
502 | ||
503 | if (!pskb_may_pull(skb, sizeof(*th))) | |
504 | return -EINVAL; | |
505 | ||
eddc9ec5 | 506 | iph = ip_hdr(skb); |
aa8223c7 | 507 | th = tcp_hdr(skb); |
a430a43d HX |
508 | |
509 | th->check = 0; | |
ba7808ea | 510 | th->check = ~tcp_v4_check(skb->len, iph->saddr, iph->daddr, 0); |
663ead3b | 511 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 512 | skb->csum_offset = offsetof(struct tcphdr, check); |
84fa7933 | 513 | skb->ip_summed = CHECKSUM_PARTIAL; |
a430a43d HX |
514 | return 0; |
515 | } | |
516 | ||
1da177e4 LT |
517 | /* |
518 | * This routine will send an RST to the other tcp. | |
519 | * | |
520 | * Someone asks: why I NEVER use socket parameters (TOS, TTL etc.) | |
521 | * for reset. | |
522 | * Answer: if a packet caused RST, it is not for a socket | |
523 | * existing in our system, if it is matched to a socket, | |
524 | * it is just duplicate segment or bug in other side's TCP. | |
525 | * So that we build reply only basing on parameters | |
526 | * arrived with segment. | |
527 | * Exception: precedence violation. We do not implement it in any case. | |
528 | */ | |
529 | ||
cfb6eeb4 | 530 | static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 531 | { |
aa8223c7 | 532 | struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
533 | struct { |
534 | struct tcphdr th; | |
535 | #ifdef CONFIG_TCP_MD5SIG | |
714e85be | 536 | __be32 opt[(TCPOLEN_MD5SIG_ALIGNED >> 2)]; |
cfb6eeb4 YH |
537 | #endif |
538 | } rep; | |
1da177e4 | 539 | struct ip_reply_arg arg; |
cfb6eeb4 YH |
540 | #ifdef CONFIG_TCP_MD5SIG |
541 | struct tcp_md5sig_key *key; | |
542 | #endif | |
1da177e4 LT |
543 | |
544 | /* Never send a reset in response to a reset. */ | |
545 | if (th->rst) | |
546 | return; | |
547 | ||
ee6b9673 | 548 | if (skb->rtable->rt_type != RTN_LOCAL) |
1da177e4 LT |
549 | return; |
550 | ||
551 | /* Swap the send and the receive. */ | |
cfb6eeb4 YH |
552 | memset(&rep, 0, sizeof(rep)); |
553 | rep.th.dest = th->source; | |
554 | rep.th.source = th->dest; | |
555 | rep.th.doff = sizeof(struct tcphdr) / 4; | |
556 | rep.th.rst = 1; | |
1da177e4 LT |
557 | |
558 | if (th->ack) { | |
cfb6eeb4 | 559 | rep.th.seq = th->ack_seq; |
1da177e4 | 560 | } else { |
cfb6eeb4 YH |
561 | rep.th.ack = 1; |
562 | rep.th.ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin + | |
563 | skb->len - (th->doff << 2)); | |
1da177e4 LT |
564 | } |
565 | ||
7174259e | 566 | memset(&arg, 0, sizeof(arg)); |
cfb6eeb4 YH |
567 | arg.iov[0].iov_base = (unsigned char *)&rep; |
568 | arg.iov[0].iov_len = sizeof(rep.th); | |
569 | ||
570 | #ifdef CONFIG_TCP_MD5SIG | |
eddc9ec5 | 571 | key = sk ? tcp_v4_md5_do_lookup(sk, ip_hdr(skb)->daddr) : NULL; |
cfb6eeb4 YH |
572 | if (key) { |
573 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | | |
574 | (TCPOPT_NOP << 16) | | |
575 | (TCPOPT_MD5SIG << 8) | | |
576 | TCPOLEN_MD5SIG); | |
577 | /* Update length and the length the header thinks exists */ | |
578 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; | |
579 | rep.th.doff = arg.iov[0].iov_len / 4; | |
580 | ||
581 | tcp_v4_do_calc_md5_hash((__u8 *)&rep.opt[1], | |
582 | key, | |
eddc9ec5 ACM |
583 | ip_hdr(skb)->daddr, |
584 | ip_hdr(skb)->saddr, | |
cfb6eeb4 YH |
585 | &rep.th, IPPROTO_TCP, |
586 | arg.iov[0].iov_len); | |
587 | } | |
588 | #endif | |
eddc9ec5 ACM |
589 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
590 | ip_hdr(skb)->saddr, /* XXX */ | |
1da177e4 LT |
591 | sizeof(struct tcphdr), IPPROTO_TCP, 0); |
592 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; | |
593 | ||
7feb49c8 DL |
594 | ip_send_reply(dev_net(skb->dst->dev)->ipv4.tcp_sock, skb, |
595 | &arg, arg.iov[0].iov_len); | |
1da177e4 LT |
596 | |
597 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
598 | TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); | |
599 | } | |
600 | ||
601 | /* The code following below sending ACKs in SYN-RECV and TIME-WAIT states | |
602 | outside socket context is ugly, certainly. What can I do? | |
603 | */ | |
604 | ||
cfb6eeb4 YH |
605 | static void tcp_v4_send_ack(struct tcp_timewait_sock *twsk, |
606 | struct sk_buff *skb, u32 seq, u32 ack, | |
1da177e4 LT |
607 | u32 win, u32 ts) |
608 | { | |
aa8223c7 | 609 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
610 | struct { |
611 | struct tcphdr th; | |
714e85be | 612 | __be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2) |
cfb6eeb4 | 613 | #ifdef CONFIG_TCP_MD5SIG |
714e85be | 614 | + (TCPOLEN_MD5SIG_ALIGNED >> 2) |
cfb6eeb4 YH |
615 | #endif |
616 | ]; | |
1da177e4 LT |
617 | } rep; |
618 | struct ip_reply_arg arg; | |
cfb6eeb4 YH |
619 | #ifdef CONFIG_TCP_MD5SIG |
620 | struct tcp_md5sig_key *key; | |
621 | struct tcp_md5sig_key tw_key; | |
622 | #endif | |
1da177e4 LT |
623 | |
624 | memset(&rep.th, 0, sizeof(struct tcphdr)); | |
7174259e | 625 | memset(&arg, 0, sizeof(arg)); |
1da177e4 LT |
626 | |
627 | arg.iov[0].iov_base = (unsigned char *)&rep; | |
628 | arg.iov[0].iov_len = sizeof(rep.th); | |
629 | if (ts) { | |
cfb6eeb4 YH |
630 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
631 | (TCPOPT_TIMESTAMP << 8) | | |
632 | TCPOLEN_TIMESTAMP); | |
633 | rep.opt[1] = htonl(tcp_time_stamp); | |
634 | rep.opt[2] = htonl(ts); | |
cb48cfe8 | 635 | arg.iov[0].iov_len += TCPOLEN_TSTAMP_ALIGNED; |
1da177e4 LT |
636 | } |
637 | ||
638 | /* Swap the send and the receive. */ | |
639 | rep.th.dest = th->source; | |
640 | rep.th.source = th->dest; | |
641 | rep.th.doff = arg.iov[0].iov_len / 4; | |
642 | rep.th.seq = htonl(seq); | |
643 | rep.th.ack_seq = htonl(ack); | |
644 | rep.th.ack = 1; | |
645 | rep.th.window = htons(win); | |
646 | ||
cfb6eeb4 YH |
647 | #ifdef CONFIG_TCP_MD5SIG |
648 | /* | |
649 | * The SKB holds an imcoming packet, but may not have a valid ->sk | |
650 | * pointer. This is especially the case when we're dealing with a | |
651 | * TIME_WAIT ack, because the sk structure is long gone, and only | |
652 | * the tcp_timewait_sock remains. So the md5 key is stashed in that | |
653 | * structure, and we use it in preference. I believe that (twsk || | |
654 | * skb->sk) holds true, but we program defensively. | |
655 | */ | |
656 | if (!twsk && skb->sk) { | |
eddc9ec5 | 657 | key = tcp_v4_md5_do_lookup(skb->sk, ip_hdr(skb)->daddr); |
cfb6eeb4 YH |
658 | } else if (twsk && twsk->tw_md5_keylen) { |
659 | tw_key.key = twsk->tw_md5_key; | |
660 | tw_key.keylen = twsk->tw_md5_keylen; | |
661 | key = &tw_key; | |
7174259e | 662 | } else |
cfb6eeb4 | 663 | key = NULL; |
cfb6eeb4 YH |
664 | |
665 | if (key) { | |
666 | int offset = (ts) ? 3 : 0; | |
667 | ||
668 | rep.opt[offset++] = htonl((TCPOPT_NOP << 24) | | |
669 | (TCPOPT_NOP << 16) | | |
670 | (TCPOPT_MD5SIG << 8) | | |
671 | TCPOLEN_MD5SIG); | |
672 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; | |
673 | rep.th.doff = arg.iov[0].iov_len/4; | |
674 | ||
675 | tcp_v4_do_calc_md5_hash((__u8 *)&rep.opt[offset], | |
676 | key, | |
eddc9ec5 ACM |
677 | ip_hdr(skb)->daddr, |
678 | ip_hdr(skb)->saddr, | |
cfb6eeb4 YH |
679 | &rep.th, IPPROTO_TCP, |
680 | arg.iov[0].iov_len); | |
681 | } | |
682 | #endif | |
eddc9ec5 ACM |
683 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
684 | ip_hdr(skb)->saddr, /* XXX */ | |
1da177e4 LT |
685 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
686 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; | |
f0e48dbf PM |
687 | if (twsk) |
688 | arg.bound_dev_if = twsk->tw_sk.tw_bound_dev_if; | |
1da177e4 | 689 | |
7feb49c8 DL |
690 | ip_send_reply(dev_net(skb->dev)->ipv4.tcp_sock, skb, |
691 | &arg, arg.iov[0].iov_len); | |
1da177e4 LT |
692 | |
693 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
694 | } | |
695 | ||
696 | static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
697 | { | |
8feaf0c0 | 698 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 699 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 700 | |
cfb6eeb4 | 701 | tcp_v4_send_ack(tcptw, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
7174259e ACM |
702 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
703 | tcptw->tw_ts_recent); | |
1da177e4 | 704 | |
8feaf0c0 | 705 | inet_twsk_put(tw); |
1da177e4 LT |
706 | } |
707 | ||
7174259e ACM |
708 | static void tcp_v4_reqsk_send_ack(struct sk_buff *skb, |
709 | struct request_sock *req) | |
1da177e4 | 710 | { |
cfb6eeb4 YH |
711 | tcp_v4_send_ack(NULL, skb, tcp_rsk(req)->snt_isn + 1, |
712 | tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, | |
1da177e4 LT |
713 | req->ts_recent); |
714 | } | |
715 | ||
1da177e4 | 716 | /* |
9bf1d83e | 717 | * Send a SYN-ACK after having received a SYN. |
60236fdd | 718 | * This still operates on a request_sock only, not on a big |
1da177e4 LT |
719 | * socket. |
720 | */ | |
fd80eb94 DL |
721 | static int __tcp_v4_send_synack(struct sock *sk, struct request_sock *req, |
722 | struct dst_entry *dst) | |
1da177e4 | 723 | { |
2e6599cb | 724 | const struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 LT |
725 | int err = -1; |
726 | struct sk_buff * skb; | |
727 | ||
728 | /* First, grab a route. */ | |
463c84b9 | 729 | if (!dst && (dst = inet_csk_route_req(sk, req)) == NULL) |
fd80eb94 | 730 | return -1; |
1da177e4 LT |
731 | |
732 | skb = tcp_make_synack(sk, dst, req); | |
733 | ||
734 | if (skb) { | |
aa8223c7 | 735 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 736 | |
ba7808ea | 737 | th->check = tcp_v4_check(skb->len, |
2e6599cb ACM |
738 | ireq->loc_addr, |
739 | ireq->rmt_addr, | |
1da177e4 LT |
740 | csum_partial((char *)th, skb->len, |
741 | skb->csum)); | |
742 | ||
2e6599cb ACM |
743 | err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, |
744 | ireq->rmt_addr, | |
745 | ireq->opt); | |
b9df3cb8 | 746 | err = net_xmit_eval(err); |
1da177e4 LT |
747 | } |
748 | ||
1da177e4 LT |
749 | dst_release(dst); |
750 | return err; | |
751 | } | |
752 | ||
fd80eb94 DL |
753 | static int tcp_v4_send_synack(struct sock *sk, struct request_sock *req) |
754 | { | |
755 | return __tcp_v4_send_synack(sk, req, NULL); | |
756 | } | |
757 | ||
1da177e4 | 758 | /* |
60236fdd | 759 | * IPv4 request_sock destructor. |
1da177e4 | 760 | */ |
60236fdd | 761 | static void tcp_v4_reqsk_destructor(struct request_sock *req) |
1da177e4 | 762 | { |
a51482bd | 763 | kfree(inet_rsk(req)->opt); |
1da177e4 LT |
764 | } |
765 | ||
80e40daa | 766 | #ifdef CONFIG_SYN_COOKIES |
40efc6fa | 767 | static void syn_flood_warning(struct sk_buff *skb) |
1da177e4 LT |
768 | { |
769 | static unsigned long warntime; | |
770 | ||
771 | if (time_after(jiffies, (warntime + HZ * 60))) { | |
772 | warntime = jiffies; | |
773 | printk(KERN_INFO | |
774 | "possible SYN flooding on port %d. Sending cookies.\n", | |
aa8223c7 | 775 | ntohs(tcp_hdr(skb)->dest)); |
1da177e4 LT |
776 | } |
777 | } | |
80e40daa | 778 | #endif |
1da177e4 LT |
779 | |
780 | /* | |
60236fdd | 781 | * Save and compile IPv4 options into the request_sock if needed. |
1da177e4 | 782 | */ |
40efc6fa SH |
783 | static struct ip_options *tcp_v4_save_options(struct sock *sk, |
784 | struct sk_buff *skb) | |
1da177e4 LT |
785 | { |
786 | struct ip_options *opt = &(IPCB(skb)->opt); | |
787 | struct ip_options *dopt = NULL; | |
788 | ||
789 | if (opt && opt->optlen) { | |
790 | int opt_size = optlength(opt); | |
791 | dopt = kmalloc(opt_size, GFP_ATOMIC); | |
792 | if (dopt) { | |
793 | if (ip_options_echo(dopt, skb)) { | |
794 | kfree(dopt); | |
795 | dopt = NULL; | |
796 | } | |
797 | } | |
798 | } | |
799 | return dopt; | |
800 | } | |
801 | ||
cfb6eeb4 YH |
802 | #ifdef CONFIG_TCP_MD5SIG |
803 | /* | |
804 | * RFC2385 MD5 checksumming requires a mapping of | |
805 | * IP address->MD5 Key. | |
806 | * We need to maintain these in the sk structure. | |
807 | */ | |
808 | ||
809 | /* Find the Key structure for an address. */ | |
7174259e ACM |
810 | static struct tcp_md5sig_key * |
811 | tcp_v4_md5_do_lookup(struct sock *sk, __be32 addr) | |
cfb6eeb4 YH |
812 | { |
813 | struct tcp_sock *tp = tcp_sk(sk); | |
814 | int i; | |
815 | ||
816 | if (!tp->md5sig_info || !tp->md5sig_info->entries4) | |
817 | return NULL; | |
818 | for (i = 0; i < tp->md5sig_info->entries4; i++) { | |
819 | if (tp->md5sig_info->keys4[i].addr == addr) | |
f8ab18d2 | 820 | return &tp->md5sig_info->keys4[i].base; |
cfb6eeb4 YH |
821 | } |
822 | return NULL; | |
823 | } | |
824 | ||
825 | struct tcp_md5sig_key *tcp_v4_md5_lookup(struct sock *sk, | |
826 | struct sock *addr_sk) | |
827 | { | |
828 | return tcp_v4_md5_do_lookup(sk, inet_sk(addr_sk)->daddr); | |
829 | } | |
830 | ||
831 | EXPORT_SYMBOL(tcp_v4_md5_lookup); | |
832 | ||
f5b99bcd AB |
833 | static struct tcp_md5sig_key *tcp_v4_reqsk_md5_lookup(struct sock *sk, |
834 | struct request_sock *req) | |
cfb6eeb4 YH |
835 | { |
836 | return tcp_v4_md5_do_lookup(sk, inet_rsk(req)->rmt_addr); | |
837 | } | |
838 | ||
839 | /* This can be called on a newly created socket, from other files */ | |
840 | int tcp_v4_md5_do_add(struct sock *sk, __be32 addr, | |
841 | u8 *newkey, u8 newkeylen) | |
842 | { | |
843 | /* Add Key to the list */ | |
b0a713e9 | 844 | struct tcp_md5sig_key *key; |
cfb6eeb4 YH |
845 | struct tcp_sock *tp = tcp_sk(sk); |
846 | struct tcp4_md5sig_key *keys; | |
847 | ||
b0a713e9 | 848 | key = tcp_v4_md5_do_lookup(sk, addr); |
cfb6eeb4 YH |
849 | if (key) { |
850 | /* Pre-existing entry - just update that one. */ | |
b0a713e9 MD |
851 | kfree(key->key); |
852 | key->key = newkey; | |
853 | key->keylen = newkeylen; | |
cfb6eeb4 | 854 | } else { |
f6685938 ACM |
855 | struct tcp_md5sig_info *md5sig; |
856 | ||
cfb6eeb4 | 857 | if (!tp->md5sig_info) { |
f6685938 ACM |
858 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), |
859 | GFP_ATOMIC); | |
cfb6eeb4 YH |
860 | if (!tp->md5sig_info) { |
861 | kfree(newkey); | |
862 | return -ENOMEM; | |
863 | } | |
3d7dbeac | 864 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 YH |
865 | } |
866 | if (tcp_alloc_md5sig_pool() == NULL) { | |
867 | kfree(newkey); | |
868 | return -ENOMEM; | |
869 | } | |
f6685938 ACM |
870 | md5sig = tp->md5sig_info; |
871 | ||
872 | if (md5sig->alloced4 == md5sig->entries4) { | |
873 | keys = kmalloc((sizeof(*keys) * | |
e905a9ed | 874 | (md5sig->entries4 + 1)), GFP_ATOMIC); |
cfb6eeb4 YH |
875 | if (!keys) { |
876 | kfree(newkey); | |
877 | tcp_free_md5sig_pool(); | |
878 | return -ENOMEM; | |
879 | } | |
880 | ||
f6685938 ACM |
881 | if (md5sig->entries4) |
882 | memcpy(keys, md5sig->keys4, | |
883 | sizeof(*keys) * md5sig->entries4); | |
cfb6eeb4 YH |
884 | |
885 | /* Free old key list, and reference new one */ | |
a80cc20d | 886 | kfree(md5sig->keys4); |
f6685938 ACM |
887 | md5sig->keys4 = keys; |
888 | md5sig->alloced4++; | |
cfb6eeb4 | 889 | } |
f6685938 | 890 | md5sig->entries4++; |
f8ab18d2 DM |
891 | md5sig->keys4[md5sig->entries4 - 1].addr = addr; |
892 | md5sig->keys4[md5sig->entries4 - 1].base.key = newkey; | |
893 | md5sig->keys4[md5sig->entries4 - 1].base.keylen = newkeylen; | |
cfb6eeb4 YH |
894 | } |
895 | return 0; | |
896 | } | |
897 | ||
898 | EXPORT_SYMBOL(tcp_v4_md5_do_add); | |
899 | ||
900 | static int tcp_v4_md5_add_func(struct sock *sk, struct sock *addr_sk, | |
901 | u8 *newkey, u8 newkeylen) | |
902 | { | |
903 | return tcp_v4_md5_do_add(sk, inet_sk(addr_sk)->daddr, | |
904 | newkey, newkeylen); | |
905 | } | |
906 | ||
907 | int tcp_v4_md5_do_del(struct sock *sk, __be32 addr) | |
908 | { | |
909 | struct tcp_sock *tp = tcp_sk(sk); | |
910 | int i; | |
911 | ||
912 | for (i = 0; i < tp->md5sig_info->entries4; i++) { | |
913 | if (tp->md5sig_info->keys4[i].addr == addr) { | |
914 | /* Free the key */ | |
f8ab18d2 | 915 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
916 | tp->md5sig_info->entries4--; |
917 | ||
918 | if (tp->md5sig_info->entries4 == 0) { | |
919 | kfree(tp->md5sig_info->keys4); | |
920 | tp->md5sig_info->keys4 = NULL; | |
8228a18d | 921 | tp->md5sig_info->alloced4 = 0; |
7174259e | 922 | } else if (tp->md5sig_info->entries4 != i) { |
cfb6eeb4 | 923 | /* Need to do some manipulation */ |
354faf09 YH |
924 | memmove(&tp->md5sig_info->keys4[i], |
925 | &tp->md5sig_info->keys4[i+1], | |
926 | (tp->md5sig_info->entries4 - i) * | |
927 | sizeof(struct tcp4_md5sig_key)); | |
cfb6eeb4 YH |
928 | } |
929 | tcp_free_md5sig_pool(); | |
930 | return 0; | |
931 | } | |
932 | } | |
933 | return -ENOENT; | |
934 | } | |
935 | ||
936 | EXPORT_SYMBOL(tcp_v4_md5_do_del); | |
937 | ||
7174259e | 938 | static void tcp_v4_clear_md5_list(struct sock *sk) |
cfb6eeb4 YH |
939 | { |
940 | struct tcp_sock *tp = tcp_sk(sk); | |
941 | ||
942 | /* Free each key, then the set of key keys, | |
943 | * the crypto element, and then decrement our | |
944 | * hold on the last resort crypto. | |
945 | */ | |
946 | if (tp->md5sig_info->entries4) { | |
947 | int i; | |
948 | for (i = 0; i < tp->md5sig_info->entries4; i++) | |
f8ab18d2 | 949 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
950 | tp->md5sig_info->entries4 = 0; |
951 | tcp_free_md5sig_pool(); | |
952 | } | |
953 | if (tp->md5sig_info->keys4) { | |
954 | kfree(tp->md5sig_info->keys4); | |
955 | tp->md5sig_info->keys4 = NULL; | |
956 | tp->md5sig_info->alloced4 = 0; | |
957 | } | |
958 | } | |
959 | ||
7174259e ACM |
960 | static int tcp_v4_parse_md5_keys(struct sock *sk, char __user *optval, |
961 | int optlen) | |
cfb6eeb4 YH |
962 | { |
963 | struct tcp_md5sig cmd; | |
964 | struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr; | |
965 | u8 *newkey; | |
966 | ||
967 | if (optlen < sizeof(cmd)) | |
968 | return -EINVAL; | |
969 | ||
7174259e | 970 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
cfb6eeb4 YH |
971 | return -EFAULT; |
972 | ||
973 | if (sin->sin_family != AF_INET) | |
974 | return -EINVAL; | |
975 | ||
976 | if (!cmd.tcpm_key || !cmd.tcpm_keylen) { | |
977 | if (!tcp_sk(sk)->md5sig_info) | |
978 | return -ENOENT; | |
979 | return tcp_v4_md5_do_del(sk, sin->sin_addr.s_addr); | |
980 | } | |
981 | ||
982 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
983 | return -EINVAL; | |
984 | ||
985 | if (!tcp_sk(sk)->md5sig_info) { | |
986 | struct tcp_sock *tp = tcp_sk(sk); | |
7174259e | 987 | struct tcp_md5sig_info *p = kzalloc(sizeof(*p), GFP_KERNEL); |
cfb6eeb4 | 988 | |
cfb6eeb4 YH |
989 | if (!p) |
990 | return -EINVAL; | |
991 | ||
992 | tp->md5sig_info = p; | |
3d7dbeac | 993 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 YH |
994 | } |
995 | ||
f6685938 | 996 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
997 | if (!newkey) |
998 | return -ENOMEM; | |
cfb6eeb4 YH |
999 | return tcp_v4_md5_do_add(sk, sin->sin_addr.s_addr, |
1000 | newkey, cmd.tcpm_keylen); | |
1001 | } | |
1002 | ||
1003 | static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, | |
1004 | __be32 saddr, __be32 daddr, | |
1005 | struct tcphdr *th, int protocol, | |
9cb5734e | 1006 | unsigned int tcplen) |
cfb6eeb4 YH |
1007 | { |
1008 | struct scatterlist sg[4]; | |
1009 | __u16 data_len; | |
1010 | int block = 0; | |
8e5200f5 | 1011 | __sum16 old_checksum; |
cfb6eeb4 YH |
1012 | struct tcp_md5sig_pool *hp; |
1013 | struct tcp4_pseudohdr *bp; | |
1014 | struct hash_desc *desc; | |
1015 | int err; | |
1016 | unsigned int nbytes = 0; | |
1017 | ||
1018 | /* | |
1019 | * Okay, so RFC2385 is turned on for this connection, | |
1020 | * so we need to generate the MD5 hash for the packet now. | |
1021 | */ | |
1022 | ||
1023 | hp = tcp_get_md5sig_pool(); | |
1024 | if (!hp) | |
1025 | goto clear_hash_noput; | |
1026 | ||
1027 | bp = &hp->md5_blk.ip4; | |
1028 | desc = &hp->md5_desc; | |
1029 | ||
1030 | /* | |
1031 | * 1. the TCP pseudo-header (in the order: source IP address, | |
1032 | * destination IP address, zero-padded protocol number, and | |
1033 | * segment length) | |
1034 | */ | |
1035 | bp->saddr = saddr; | |
1036 | bp->daddr = daddr; | |
1037 | bp->pad = 0; | |
1038 | bp->protocol = protocol; | |
1039 | bp->len = htons(tcplen); | |
c7da57a1 DM |
1040 | |
1041 | sg_init_table(sg, 4); | |
1042 | ||
cfb6eeb4 YH |
1043 | sg_set_buf(&sg[block++], bp, sizeof(*bp)); |
1044 | nbytes += sizeof(*bp); | |
1045 | ||
cfb6eeb4 YH |
1046 | /* 2. the TCP header, excluding options, and assuming a |
1047 | * checksum of zero/ | |
1048 | */ | |
1049 | old_checksum = th->check; | |
1050 | th->check = 0; | |
1051 | sg_set_buf(&sg[block++], th, sizeof(struct tcphdr)); | |
1052 | nbytes += sizeof(struct tcphdr); | |
08dd1a50 | 1053 | |
cfb6eeb4 YH |
1054 | /* 3. the TCP segment data (if any) */ |
1055 | data_len = tcplen - (th->doff << 2); | |
1056 | if (data_len > 0) { | |
1057 | unsigned char *data = (unsigned char *)th + (th->doff << 2); | |
1058 | sg_set_buf(&sg[block++], data, data_len); | |
1059 | nbytes += data_len; | |
1060 | } | |
1061 | ||
1062 | /* 4. an independently-specified key or password, known to both | |
1063 | * TCPs and presumably connection-specific | |
1064 | */ | |
1065 | sg_set_buf(&sg[block++], key->key, key->keylen); | |
1066 | nbytes += key->keylen; | |
1067 | ||
c46f2334 | 1068 | sg_mark_end(&sg[block - 1]); |
c7da57a1 | 1069 | |
cfb6eeb4 YH |
1070 | /* Now store the Hash into the packet */ |
1071 | err = crypto_hash_init(desc); | |
1072 | if (err) | |
1073 | goto clear_hash; | |
1074 | err = crypto_hash_update(desc, sg, nbytes); | |
1075 | if (err) | |
1076 | goto clear_hash; | |
1077 | err = crypto_hash_final(desc, md5_hash); | |
1078 | if (err) | |
1079 | goto clear_hash; | |
1080 | ||
1081 | /* Reset header, and free up the crypto */ | |
1082 | tcp_put_md5sig_pool(); | |
1083 | th->check = old_checksum; | |
1084 | ||
1085 | out: | |
cfb6eeb4 YH |
1086 | return 0; |
1087 | clear_hash: | |
1088 | tcp_put_md5sig_pool(); | |
1089 | clear_hash_noput: | |
1090 | memset(md5_hash, 0, 16); | |
1091 | goto out; | |
1092 | } | |
1093 | ||
1094 | int tcp_v4_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, | |
1095 | struct sock *sk, | |
1096 | struct dst_entry *dst, | |
1097 | struct request_sock *req, | |
1098 | struct tcphdr *th, int protocol, | |
9cb5734e | 1099 | unsigned int tcplen) |
cfb6eeb4 YH |
1100 | { |
1101 | __be32 saddr, daddr; | |
1102 | ||
1103 | if (sk) { | |
1104 | saddr = inet_sk(sk)->saddr; | |
1105 | daddr = inet_sk(sk)->daddr; | |
1106 | } else { | |
1107 | struct rtable *rt = (struct rtable *)dst; | |
1108 | BUG_ON(!rt); | |
1109 | saddr = rt->rt_src; | |
1110 | daddr = rt->rt_dst; | |
1111 | } | |
1112 | return tcp_v4_do_calc_md5_hash(md5_hash, key, | |
1113 | saddr, daddr, | |
1114 | th, protocol, tcplen); | |
1115 | } | |
1116 | ||
1117 | EXPORT_SYMBOL(tcp_v4_calc_md5_hash); | |
1118 | ||
7174259e | 1119 | static int tcp_v4_inbound_md5_hash(struct sock *sk, struct sk_buff *skb) |
cfb6eeb4 YH |
1120 | { |
1121 | /* | |
1122 | * This gets called for each TCP segment that arrives | |
1123 | * so we want to be efficient. | |
1124 | * We have 3 drop cases: | |
1125 | * o No MD5 hash and one expected. | |
1126 | * o MD5 hash and we're not expecting one. | |
1127 | * o MD5 hash and its wrong. | |
1128 | */ | |
1129 | __u8 *hash_location = NULL; | |
1130 | struct tcp_md5sig_key *hash_expected; | |
eddc9ec5 | 1131 | const struct iphdr *iph = ip_hdr(skb); |
aa8223c7 | 1132 | struct tcphdr *th = tcp_hdr(skb); |
7174259e | 1133 | int length = (th->doff << 2) - sizeof(struct tcphdr); |
cfb6eeb4 YH |
1134 | int genhash; |
1135 | unsigned char *ptr; | |
1136 | unsigned char newhash[16]; | |
1137 | ||
1138 | hash_expected = tcp_v4_md5_do_lookup(sk, iph->saddr); | |
1139 | ||
1140 | /* | |
1141 | * If the TCP option length is less than the TCP_MD5SIG | |
1142 | * option length, then we can shortcut | |
1143 | */ | |
1144 | if (length < TCPOLEN_MD5SIG) { | |
1145 | if (hash_expected) | |
1146 | return 1; | |
1147 | else | |
1148 | return 0; | |
1149 | } | |
1150 | ||
1151 | /* Okay, we can't shortcut - we have to grub through the options */ | |
1152 | ptr = (unsigned char *)(th + 1); | |
1153 | while (length > 0) { | |
1154 | int opcode = *ptr++; | |
1155 | int opsize; | |
1156 | ||
1157 | switch (opcode) { | |
1158 | case TCPOPT_EOL: | |
1159 | goto done_opts; | |
1160 | case TCPOPT_NOP: | |
1161 | length--; | |
1162 | continue; | |
1163 | default: | |
1164 | opsize = *ptr++; | |
1165 | if (opsize < 2) | |
1166 | goto done_opts; | |
1167 | if (opsize > length) | |
1168 | goto done_opts; | |
1169 | ||
1170 | if (opcode == TCPOPT_MD5SIG) { | |
1171 | hash_location = ptr; | |
1172 | goto done_opts; | |
1173 | } | |
1174 | } | |
1175 | ptr += opsize-2; | |
1176 | length -= opsize; | |
1177 | } | |
1178 | done_opts: | |
1179 | /* We've parsed the options - do we have a hash? */ | |
1180 | if (!hash_expected && !hash_location) | |
1181 | return 0; | |
1182 | ||
1183 | if (hash_expected && !hash_location) { | |
a9fc00cc | 1184 | LIMIT_NETDEBUG(KERN_INFO "MD5 Hash expected but NOT found " |
cfb6eeb4 | 1185 | "(" NIPQUAD_FMT ", %d)->(" NIPQUAD_FMT ", %d)\n", |
7174259e ACM |
1186 | NIPQUAD(iph->saddr), ntohs(th->source), |
1187 | NIPQUAD(iph->daddr), ntohs(th->dest)); | |
cfb6eeb4 YH |
1188 | return 1; |
1189 | } | |
1190 | ||
1191 | if (!hash_expected && hash_location) { | |
7174259e | 1192 | LIMIT_NETDEBUG(KERN_INFO "MD5 Hash NOT expected but found " |
cfb6eeb4 | 1193 | "(" NIPQUAD_FMT ", %d)->(" NIPQUAD_FMT ", %d)\n", |
7174259e ACM |
1194 | NIPQUAD(iph->saddr), ntohs(th->source), |
1195 | NIPQUAD(iph->daddr), ntohs(th->dest)); | |
cfb6eeb4 YH |
1196 | return 1; |
1197 | } | |
1198 | ||
1199 | /* Okay, so this is hash_expected and hash_location - | |
1200 | * so we need to calculate the checksum. | |
1201 | */ | |
1202 | genhash = tcp_v4_do_calc_md5_hash(newhash, | |
1203 | hash_expected, | |
1204 | iph->saddr, iph->daddr, | |
1205 | th, sk->sk_protocol, | |
1206 | skb->len); | |
1207 | ||
1208 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { | |
1209 | if (net_ratelimit()) { | |
1210 | printk(KERN_INFO "MD5 Hash failed for " | |
1211 | "(" NIPQUAD_FMT ", %d)->(" NIPQUAD_FMT ", %d)%s\n", | |
7174259e ACM |
1212 | NIPQUAD(iph->saddr), ntohs(th->source), |
1213 | NIPQUAD(iph->daddr), ntohs(th->dest), | |
cfb6eeb4 | 1214 | genhash ? " tcp_v4_calc_md5_hash failed" : ""); |
cfb6eeb4 YH |
1215 | } |
1216 | return 1; | |
1217 | } | |
1218 | return 0; | |
1219 | } | |
1220 | ||
1221 | #endif | |
1222 | ||
72a3effa | 1223 | struct request_sock_ops tcp_request_sock_ops __read_mostly = { |
1da177e4 | 1224 | .family = PF_INET, |
2e6599cb | 1225 | .obj_size = sizeof(struct tcp_request_sock), |
1da177e4 | 1226 | .rtx_syn_ack = tcp_v4_send_synack, |
60236fdd ACM |
1227 | .send_ack = tcp_v4_reqsk_send_ack, |
1228 | .destructor = tcp_v4_reqsk_destructor, | |
1da177e4 LT |
1229 | .send_reset = tcp_v4_send_reset, |
1230 | }; | |
1231 | ||
cfb6eeb4 | 1232 | #ifdef CONFIG_TCP_MD5SIG |
b6332e6c | 1233 | static struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = { |
cfb6eeb4 | 1234 | .md5_lookup = tcp_v4_reqsk_md5_lookup, |
cfb6eeb4 | 1235 | }; |
b6332e6c | 1236 | #endif |
cfb6eeb4 | 1237 | |
6d6ee43e ACM |
1238 | static struct timewait_sock_ops tcp_timewait_sock_ops = { |
1239 | .twsk_obj_size = sizeof(struct tcp_timewait_sock), | |
1240 | .twsk_unique = tcp_twsk_unique, | |
cfb6eeb4 | 1241 | .twsk_destructor= tcp_twsk_destructor, |
6d6ee43e ACM |
1242 | }; |
1243 | ||
1da177e4 LT |
1244 | int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) |
1245 | { | |
2e6599cb | 1246 | struct inet_request_sock *ireq; |
1da177e4 | 1247 | struct tcp_options_received tmp_opt; |
60236fdd | 1248 | struct request_sock *req; |
eddc9ec5 ACM |
1249 | __be32 saddr = ip_hdr(skb)->saddr; |
1250 | __be32 daddr = ip_hdr(skb)->daddr; | |
1da177e4 LT |
1251 | __u32 isn = TCP_SKB_CB(skb)->when; |
1252 | struct dst_entry *dst = NULL; | |
1253 | #ifdef CONFIG_SYN_COOKIES | |
1254 | int want_cookie = 0; | |
1255 | #else | |
1256 | #define want_cookie 0 /* Argh, why doesn't gcc optimize this :( */ | |
1257 | #endif | |
1258 | ||
1259 | /* Never answer to SYNs send to broadcast or multicast */ | |
ee6b9673 | 1260 | if (skb->rtable->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) |
1da177e4 LT |
1261 | goto drop; |
1262 | ||
1263 | /* TW buckets are converted to open requests without | |
1264 | * limitations, they conserve resources and peer is | |
1265 | * evidently real one. | |
1266 | */ | |
463c84b9 | 1267 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 LT |
1268 | #ifdef CONFIG_SYN_COOKIES |
1269 | if (sysctl_tcp_syncookies) { | |
1270 | want_cookie = 1; | |
1271 | } else | |
1272 | #endif | |
1273 | goto drop; | |
1274 | } | |
1275 | ||
1276 | /* Accept backlog is full. If we have already queued enough | |
1277 | * of warm entries in syn queue, drop request. It is better than | |
1278 | * clogging syn queue with openreqs with exponentially increasing | |
1279 | * timeout. | |
1280 | */ | |
463c84b9 | 1281 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1282 | goto drop; |
1283 | ||
ce4a7d0d | 1284 | req = inet_reqsk_alloc(&tcp_request_sock_ops); |
1da177e4 LT |
1285 | if (!req) |
1286 | goto drop; | |
1287 | ||
cfb6eeb4 YH |
1288 | #ifdef CONFIG_TCP_MD5SIG |
1289 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv4_ops; | |
1290 | #endif | |
1291 | ||
1da177e4 LT |
1292 | tcp_clear_options(&tmp_opt); |
1293 | tmp_opt.mss_clamp = 536; | |
1294 | tmp_opt.user_mss = tcp_sk(sk)->rx_opt.user_mss; | |
1295 | ||
1296 | tcp_parse_options(skb, &tmp_opt, 0); | |
1297 | ||
4dfc2817 | 1298 | if (want_cookie && !tmp_opt.saw_tstamp) |
1da177e4 | 1299 | tcp_clear_options(&tmp_opt); |
1da177e4 LT |
1300 | |
1301 | if (tmp_opt.saw_tstamp && !tmp_opt.rcv_tsval) { | |
1302 | /* Some OSes (unknown ones, but I see them on web server, which | |
1303 | * contains information interesting only for windows' | |
1304 | * users) do not send their stamp in SYN. It is easy case. | |
1305 | * We simply do not advertise TS support. | |
1306 | */ | |
1307 | tmp_opt.saw_tstamp = 0; | |
1308 | tmp_opt.tstamp_ok = 0; | |
1309 | } | |
1310 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; | |
1311 | ||
1312 | tcp_openreq_init(req, &tmp_opt, skb); | |
1313 | ||
4237c75c VY |
1314 | if (security_inet_conn_request(sk, skb, req)) |
1315 | goto drop_and_free; | |
1316 | ||
2e6599cb ACM |
1317 | ireq = inet_rsk(req); |
1318 | ireq->loc_addr = daddr; | |
1319 | ireq->rmt_addr = saddr; | |
1320 | ireq->opt = tcp_v4_save_options(sk, skb); | |
1da177e4 | 1321 | if (!want_cookie) |
aa8223c7 | 1322 | TCP_ECN_create_request(req, tcp_hdr(skb)); |
1da177e4 LT |
1323 | |
1324 | if (want_cookie) { | |
1325 | #ifdef CONFIG_SYN_COOKIES | |
1326 | syn_flood_warning(skb); | |
4dfc2817 | 1327 | req->cookie_ts = tmp_opt.tstamp_ok; |
1da177e4 LT |
1328 | #endif |
1329 | isn = cookie_v4_init_sequence(sk, skb, &req->mss); | |
1330 | } else if (!isn) { | |
1331 | struct inet_peer *peer = NULL; | |
1332 | ||
1333 | /* VJ's idea. We save last timestamp seen | |
1334 | * from the destination in peer table, when entering | |
1335 | * state TIME-WAIT, and check against it before | |
1336 | * accepting new connection request. | |
1337 | * | |
1338 | * If "isn" is not zero, this request hit alive | |
1339 | * timewait bucket, so that all the necessary checks | |
1340 | * are made in the function processing timewait state. | |
1341 | */ | |
1342 | if (tmp_opt.saw_tstamp && | |
295ff7ed | 1343 | tcp_death_row.sysctl_tw_recycle && |
463c84b9 | 1344 | (dst = inet_csk_route_req(sk, req)) != NULL && |
1da177e4 LT |
1345 | (peer = rt_get_peer((struct rtable *)dst)) != NULL && |
1346 | peer->v4daddr == saddr) { | |
9d729f72 | 1347 | if (get_seconds() < peer->tcp_ts_stamp + TCP_PAWS_MSL && |
1da177e4 LT |
1348 | (s32)(peer->tcp_ts - req->ts_recent) > |
1349 | TCP_PAWS_WINDOW) { | |
1350 | NET_INC_STATS_BH(LINUX_MIB_PAWSPASSIVEREJECTED); | |
7cd04fa7 | 1351 | goto drop_and_release; |
1da177e4 LT |
1352 | } |
1353 | } | |
1354 | /* Kill the following clause, if you dislike this way. */ | |
1355 | else if (!sysctl_tcp_syncookies && | |
463c84b9 | 1356 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < |
1da177e4 LT |
1357 | (sysctl_max_syn_backlog >> 2)) && |
1358 | (!peer || !peer->tcp_ts_stamp) && | |
1359 | (!dst || !dst_metric(dst, RTAX_RTT))) { | |
1360 | /* Without syncookies last quarter of | |
1361 | * backlog is filled with destinations, | |
1362 | * proven to be alive. | |
1363 | * It means that we continue to communicate | |
1364 | * to destinations, already remembered | |
1365 | * to the moment of synflood. | |
1366 | */ | |
64ce2073 | 1367 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open " |
a7d632b6 | 1368 | "request from " NIPQUAD_FMT "/%u\n", |
64ce2073 | 1369 | NIPQUAD(saddr), |
aa8223c7 | 1370 | ntohs(tcp_hdr(skb)->source)); |
7cd04fa7 | 1371 | goto drop_and_release; |
1da177e4 LT |
1372 | } |
1373 | ||
a94f723d | 1374 | isn = tcp_v4_init_sequence(skb); |
1da177e4 | 1375 | } |
2e6599cb | 1376 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1377 | |
7cd04fa7 | 1378 | if (__tcp_v4_send_synack(sk, req, dst) || want_cookie) |
1da177e4 LT |
1379 | goto drop_and_free; |
1380 | ||
7cd04fa7 | 1381 | inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1da177e4 LT |
1382 | return 0; |
1383 | ||
7cd04fa7 DL |
1384 | drop_and_release: |
1385 | dst_release(dst); | |
1da177e4 | 1386 | drop_and_free: |
60236fdd | 1387 | reqsk_free(req); |
1da177e4 | 1388 | drop: |
1da177e4 LT |
1389 | return 0; |
1390 | } | |
1391 | ||
1392 | ||
1393 | /* | |
1394 | * The three way handshake has completed - we got a valid synack - | |
1395 | * now create the new socket. | |
1396 | */ | |
1397 | struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1398 | struct request_sock *req, |
1da177e4 LT |
1399 | struct dst_entry *dst) |
1400 | { | |
2e6599cb | 1401 | struct inet_request_sock *ireq; |
1da177e4 LT |
1402 | struct inet_sock *newinet; |
1403 | struct tcp_sock *newtp; | |
1404 | struct sock *newsk; | |
cfb6eeb4 YH |
1405 | #ifdef CONFIG_TCP_MD5SIG |
1406 | struct tcp_md5sig_key *key; | |
1407 | #endif | |
1da177e4 LT |
1408 | |
1409 | if (sk_acceptq_is_full(sk)) | |
1410 | goto exit_overflow; | |
1411 | ||
463c84b9 | 1412 | if (!dst && (dst = inet_csk_route_req(sk, req)) == NULL) |
1da177e4 LT |
1413 | goto exit; |
1414 | ||
1415 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1416 | if (!newsk) | |
1417 | goto exit; | |
1418 | ||
bcd76111 | 1419 | newsk->sk_gso_type = SKB_GSO_TCPV4; |
6cbb0df7 | 1420 | sk_setup_caps(newsk, dst); |
1da177e4 LT |
1421 | |
1422 | newtp = tcp_sk(newsk); | |
1423 | newinet = inet_sk(newsk); | |
2e6599cb ACM |
1424 | ireq = inet_rsk(req); |
1425 | newinet->daddr = ireq->rmt_addr; | |
1426 | newinet->rcv_saddr = ireq->loc_addr; | |
1427 | newinet->saddr = ireq->loc_addr; | |
1428 | newinet->opt = ireq->opt; | |
1429 | ireq->opt = NULL; | |
463c84b9 | 1430 | newinet->mc_index = inet_iif(skb); |
eddc9ec5 | 1431 | newinet->mc_ttl = ip_hdr(skb)->ttl; |
d83d8461 | 1432 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1433 | if (newinet->opt) |
d83d8461 | 1434 | inet_csk(newsk)->icsk_ext_hdr_len = newinet->opt->optlen; |
1da177e4 LT |
1435 | newinet->id = newtp->write_seq ^ jiffies; |
1436 | ||
5d424d5a | 1437 | tcp_mtup_init(newsk); |
1da177e4 LT |
1438 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1439 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1440 | tcp_initialize_rcv_mss(newsk); | |
1441 | ||
cfb6eeb4 YH |
1442 | #ifdef CONFIG_TCP_MD5SIG |
1443 | /* Copy over the MD5 key from the original socket */ | |
1444 | if ((key = tcp_v4_md5_do_lookup(sk, newinet->daddr)) != NULL) { | |
1445 | /* | |
1446 | * We're using one, so create a matching key | |
1447 | * on the newsk structure. If we fail to get | |
1448 | * memory, then we end up not copying the key | |
1449 | * across. Shucks. | |
1450 | */ | |
f6685938 ACM |
1451 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1452 | if (newkey != NULL) | |
cfb6eeb4 YH |
1453 | tcp_v4_md5_do_add(newsk, inet_sk(sk)->daddr, |
1454 | newkey, key->keylen); | |
cfb6eeb4 YH |
1455 | } |
1456 | #endif | |
1457 | ||
ab1e0a13 ACM |
1458 | __inet_hash_nolisten(newsk); |
1459 | __inet_inherit_port(sk, newsk); | |
1da177e4 LT |
1460 | |
1461 | return newsk; | |
1462 | ||
1463 | exit_overflow: | |
1464 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
1465 | exit: | |
1466 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
1467 | dst_release(dst); | |
1468 | return NULL; | |
1469 | } | |
1470 | ||
1471 | static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) | |
1472 | { | |
aa8223c7 | 1473 | struct tcphdr *th = tcp_hdr(skb); |
eddc9ec5 | 1474 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 1475 | struct sock *nsk; |
60236fdd | 1476 | struct request_sock **prev; |
1da177e4 | 1477 | /* Find possible connection requests. */ |
463c84b9 ACM |
1478 | struct request_sock *req = inet_csk_search_req(sk, &prev, th->source, |
1479 | iph->saddr, iph->daddr); | |
1da177e4 LT |
1480 | if (req) |
1481 | return tcp_check_req(sk, skb, req, prev); | |
1482 | ||
3b1e0a65 | 1483 | nsk = inet_lookup_established(sock_net(sk), &tcp_hashinfo, iph->saddr, |
c67499c0 | 1484 | th->source, iph->daddr, th->dest, inet_iif(skb)); |
1da177e4 LT |
1485 | |
1486 | if (nsk) { | |
1487 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1488 | bh_lock_sock(nsk); | |
1489 | return nsk; | |
1490 | } | |
9469c7b4 | 1491 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1492 | return NULL; |
1493 | } | |
1494 | ||
1495 | #ifdef CONFIG_SYN_COOKIES | |
1496 | if (!th->rst && !th->syn && th->ack) | |
1497 | sk = cookie_v4_check(sk, skb, &(IPCB(skb)->opt)); | |
1498 | #endif | |
1499 | return sk; | |
1500 | } | |
1501 | ||
b51655b9 | 1502 | static __sum16 tcp_v4_checksum_init(struct sk_buff *skb) |
1da177e4 | 1503 | { |
eddc9ec5 ACM |
1504 | const struct iphdr *iph = ip_hdr(skb); |
1505 | ||
84fa7933 | 1506 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
eddc9ec5 ACM |
1507 | if (!tcp_v4_check(skb->len, iph->saddr, |
1508 | iph->daddr, skb->csum)) { | |
fb286bb2 | 1509 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1510 | return 0; |
fb286bb2 | 1511 | } |
1da177e4 | 1512 | } |
fb286bb2 | 1513 | |
eddc9ec5 | 1514 | skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, |
fb286bb2 HX |
1515 | skb->len, IPPROTO_TCP, 0); |
1516 | ||
1da177e4 | 1517 | if (skb->len <= 76) { |
fb286bb2 | 1518 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1519 | } |
1520 | return 0; | |
1521 | } | |
1522 | ||
1523 | ||
1524 | /* The socket must have it's spinlock held when we get | |
1525 | * here. | |
1526 | * | |
1527 | * We have a potential double-lock case here, so even when | |
1528 | * doing backlog processing we use the BH locking scheme. | |
1529 | * This is because we cannot sleep with the original spinlock | |
1530 | * held. | |
1531 | */ | |
1532 | int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1533 | { | |
cfb6eeb4 YH |
1534 | struct sock *rsk; |
1535 | #ifdef CONFIG_TCP_MD5SIG | |
1536 | /* | |
1537 | * We really want to reject the packet as early as possible | |
1538 | * if: | |
1539 | * o We're expecting an MD5'd packet and this is no MD5 tcp option | |
1540 | * o There is an MD5 option and we're not expecting one | |
1541 | */ | |
7174259e | 1542 | if (tcp_v4_inbound_md5_hash(sk, skb)) |
cfb6eeb4 YH |
1543 | goto discard; |
1544 | #endif | |
1545 | ||
1da177e4 LT |
1546 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
1547 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1548 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) { |
cfb6eeb4 | 1549 | rsk = sk; |
1da177e4 | 1550 | goto reset; |
cfb6eeb4 | 1551 | } |
1da177e4 LT |
1552 | TCP_CHECK_TIMER(sk); |
1553 | return 0; | |
1554 | } | |
1555 | ||
ab6a5bb6 | 1556 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1557 | goto csum_err; |
1558 | ||
1559 | if (sk->sk_state == TCP_LISTEN) { | |
1560 | struct sock *nsk = tcp_v4_hnd_req(sk, skb); | |
1561 | if (!nsk) | |
1562 | goto discard; | |
1563 | ||
1564 | if (nsk != sk) { | |
cfb6eeb4 YH |
1565 | if (tcp_child_process(sk, nsk, skb)) { |
1566 | rsk = nsk; | |
1da177e4 | 1567 | goto reset; |
cfb6eeb4 | 1568 | } |
1da177e4 LT |
1569 | return 0; |
1570 | } | |
1571 | } | |
1572 | ||
1573 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1574 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) { |
cfb6eeb4 | 1575 | rsk = sk; |
1da177e4 | 1576 | goto reset; |
cfb6eeb4 | 1577 | } |
1da177e4 LT |
1578 | TCP_CHECK_TIMER(sk); |
1579 | return 0; | |
1580 | ||
1581 | reset: | |
cfb6eeb4 | 1582 | tcp_v4_send_reset(rsk, skb); |
1da177e4 LT |
1583 | discard: |
1584 | kfree_skb(skb); | |
1585 | /* Be careful here. If this function gets more complicated and | |
1586 | * gcc suffers from register pressure on the x86, sk (in %ebx) | |
1587 | * might be destroyed here. This current version compiles correctly, | |
1588 | * but you have been warned. | |
1589 | */ | |
1590 | return 0; | |
1591 | ||
1592 | csum_err: | |
1593 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1594 | goto discard; | |
1595 | } | |
1596 | ||
1597 | /* | |
1598 | * From tcp_input.c | |
1599 | */ | |
1600 | ||
1601 | int tcp_v4_rcv(struct sk_buff *skb) | |
1602 | { | |
eddc9ec5 | 1603 | const struct iphdr *iph; |
1da177e4 LT |
1604 | struct tcphdr *th; |
1605 | struct sock *sk; | |
1606 | int ret; | |
1607 | ||
1608 | if (skb->pkt_type != PACKET_HOST) | |
1609 | goto discard_it; | |
1610 | ||
1611 | /* Count it even if it's bad */ | |
1612 | TCP_INC_STATS_BH(TCP_MIB_INSEGS); | |
1613 | ||
1614 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1615 | goto discard_it; | |
1616 | ||
aa8223c7 | 1617 | th = tcp_hdr(skb); |
1da177e4 LT |
1618 | |
1619 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1620 | goto bad_packet; | |
1621 | if (!pskb_may_pull(skb, th->doff * 4)) | |
1622 | goto discard_it; | |
1623 | ||
1624 | /* An explanation is required here, I think. | |
1625 | * Packet length and doff are validated by header prediction, | |
caa20d9a | 1626 | * provided case of th->doff==0 is eliminated. |
1da177e4 | 1627 | * So, we defer the checks. */ |
60476372 | 1628 | if (!skb_csum_unnecessary(skb) && tcp_v4_checksum_init(skb)) |
1da177e4 LT |
1629 | goto bad_packet; |
1630 | ||
aa8223c7 | 1631 | th = tcp_hdr(skb); |
eddc9ec5 | 1632 | iph = ip_hdr(skb); |
1da177e4 LT |
1633 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1634 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1635 | skb->len - th->doff * 4); | |
1636 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1637 | TCP_SKB_CB(skb)->when = 0; | |
eddc9ec5 | 1638 | TCP_SKB_CB(skb)->flags = iph->tos; |
1da177e4 LT |
1639 | TCP_SKB_CB(skb)->sacked = 0; |
1640 | ||
c346dca1 | 1641 | sk = __inet_lookup(dev_net(skb->dev), &tcp_hashinfo, iph->saddr, |
c67499c0 | 1642 | th->source, iph->daddr, th->dest, inet_iif(skb)); |
1da177e4 LT |
1643 | if (!sk) |
1644 | goto no_tcp_socket; | |
1645 | ||
1646 | process: | |
1647 | if (sk->sk_state == TCP_TIME_WAIT) | |
1648 | goto do_time_wait; | |
1649 | ||
1650 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1651 | goto discard_and_relse; | |
b59c2701 | 1652 | nf_reset(skb); |
1da177e4 | 1653 | |
fda9ef5d | 1654 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1655 | goto discard_and_relse; |
1656 | ||
1657 | skb->dev = NULL; | |
1658 | ||
c6366184 | 1659 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1660 | ret = 0; |
1661 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 CL |
1662 | #ifdef CONFIG_NET_DMA |
1663 | struct tcp_sock *tp = tcp_sk(sk); | |
1664 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) | |
1665 | tp->ucopy.dma_chan = get_softnet_dma(); | |
1666 | if (tp->ucopy.dma_chan) | |
1da177e4 | 1667 | ret = tcp_v4_do_rcv(sk, skb); |
1a2449a8 CL |
1668 | else |
1669 | #endif | |
1670 | { | |
1671 | if (!tcp_prequeue(sk, skb)) | |
1672 | ret = tcp_v4_do_rcv(sk, skb); | |
1673 | } | |
1da177e4 LT |
1674 | } else |
1675 | sk_add_backlog(sk, skb); | |
1676 | bh_unlock_sock(sk); | |
1677 | ||
1678 | sock_put(sk); | |
1679 | ||
1680 | return ret; | |
1681 | ||
1682 | no_tcp_socket: | |
1683 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1684 | goto discard_it; | |
1685 | ||
1686 | if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { | |
1687 | bad_packet: | |
1688 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1689 | } else { | |
cfb6eeb4 | 1690 | tcp_v4_send_reset(NULL, skb); |
1da177e4 LT |
1691 | } |
1692 | ||
1693 | discard_it: | |
1694 | /* Discard frame. */ | |
1695 | kfree_skb(skb); | |
e905a9ed | 1696 | return 0; |
1da177e4 LT |
1697 | |
1698 | discard_and_relse: | |
1699 | sock_put(sk); | |
1700 | goto discard_it; | |
1701 | ||
1702 | do_time_wait: | |
1703 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1704 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1705 | goto discard_it; |
1706 | } | |
1707 | ||
1708 | if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { | |
1709 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
9469c7b4 | 1710 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1711 | goto discard_it; |
1712 | } | |
9469c7b4 | 1713 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 | 1714 | case TCP_TW_SYN: { |
c346dca1 | 1715 | struct sock *sk2 = inet_lookup_listener(dev_net(skb->dev), |
c67499c0 | 1716 | &tcp_hashinfo, |
eddc9ec5 | 1717 | iph->daddr, th->dest, |
463c84b9 | 1718 | inet_iif(skb)); |
1da177e4 | 1719 | if (sk2) { |
9469c7b4 YH |
1720 | inet_twsk_deschedule(inet_twsk(sk), &tcp_death_row); |
1721 | inet_twsk_put(inet_twsk(sk)); | |
1da177e4 LT |
1722 | sk = sk2; |
1723 | goto process; | |
1724 | } | |
1725 | /* Fall through to ACK */ | |
1726 | } | |
1727 | case TCP_TW_ACK: | |
1728 | tcp_v4_timewait_ack(sk, skb); | |
1729 | break; | |
1730 | case TCP_TW_RST: | |
1731 | goto no_tcp_socket; | |
1732 | case TCP_TW_SUCCESS:; | |
1733 | } | |
1734 | goto discard_it; | |
1735 | } | |
1736 | ||
1da177e4 LT |
1737 | /* VJ's idea. Save last timestamp seen from this destination |
1738 | * and hold it at least for normal timewait interval to use for duplicate | |
1739 | * segment detection in subsequent connections, before they enter synchronized | |
1740 | * state. | |
1741 | */ | |
1742 | ||
1743 | int tcp_v4_remember_stamp(struct sock *sk) | |
1744 | { | |
1745 | struct inet_sock *inet = inet_sk(sk); | |
1746 | struct tcp_sock *tp = tcp_sk(sk); | |
1747 | struct rtable *rt = (struct rtable *)__sk_dst_get(sk); | |
1748 | struct inet_peer *peer = NULL; | |
1749 | int release_it = 0; | |
1750 | ||
1751 | if (!rt || rt->rt_dst != inet->daddr) { | |
1752 | peer = inet_getpeer(inet->daddr, 1); | |
1753 | release_it = 1; | |
1754 | } else { | |
1755 | if (!rt->peer) | |
1756 | rt_bind_peer(rt, 1); | |
1757 | peer = rt->peer; | |
1758 | } | |
1759 | ||
1760 | if (peer) { | |
1761 | if ((s32)(peer->tcp_ts - tp->rx_opt.ts_recent) <= 0 || | |
9d729f72 | 1762 | (peer->tcp_ts_stamp + TCP_PAWS_MSL < get_seconds() && |
1da177e4 LT |
1763 | peer->tcp_ts_stamp <= tp->rx_opt.ts_recent_stamp)) { |
1764 | peer->tcp_ts_stamp = tp->rx_opt.ts_recent_stamp; | |
1765 | peer->tcp_ts = tp->rx_opt.ts_recent; | |
1766 | } | |
1767 | if (release_it) | |
1768 | inet_putpeer(peer); | |
1769 | return 1; | |
1770 | } | |
1771 | ||
1772 | return 0; | |
1773 | } | |
1774 | ||
8feaf0c0 | 1775 | int tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw) |
1da177e4 | 1776 | { |
8feaf0c0 | 1777 | struct inet_peer *peer = inet_getpeer(tw->tw_daddr, 1); |
1da177e4 LT |
1778 | |
1779 | if (peer) { | |
8feaf0c0 ACM |
1780 | const struct tcp_timewait_sock *tcptw = tcp_twsk((struct sock *)tw); |
1781 | ||
1782 | if ((s32)(peer->tcp_ts - tcptw->tw_ts_recent) <= 0 || | |
9d729f72 | 1783 | (peer->tcp_ts_stamp + TCP_PAWS_MSL < get_seconds() && |
8feaf0c0 ACM |
1784 | peer->tcp_ts_stamp <= tcptw->tw_ts_recent_stamp)) { |
1785 | peer->tcp_ts_stamp = tcptw->tw_ts_recent_stamp; | |
1786 | peer->tcp_ts = tcptw->tw_ts_recent; | |
1da177e4 LT |
1787 | } |
1788 | inet_putpeer(peer); | |
1789 | return 1; | |
1790 | } | |
1791 | ||
1792 | return 0; | |
1793 | } | |
1794 | ||
8292a17a | 1795 | struct inet_connection_sock_af_ops ipv4_specific = { |
543d9cfe ACM |
1796 | .queue_xmit = ip_queue_xmit, |
1797 | .send_check = tcp_v4_send_check, | |
1798 | .rebuild_header = inet_sk_rebuild_header, | |
1799 | .conn_request = tcp_v4_conn_request, | |
1800 | .syn_recv_sock = tcp_v4_syn_recv_sock, | |
1801 | .remember_stamp = tcp_v4_remember_stamp, | |
1802 | .net_header_len = sizeof(struct iphdr), | |
1803 | .setsockopt = ip_setsockopt, | |
1804 | .getsockopt = ip_getsockopt, | |
1805 | .addr2sockaddr = inet_csk_addr2sockaddr, | |
1806 | .sockaddr_len = sizeof(struct sockaddr_in), | |
ab1e0a13 | 1807 | .bind_conflict = inet_csk_bind_conflict, |
3fdadf7d | 1808 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1809 | .compat_setsockopt = compat_ip_setsockopt, |
1810 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 1811 | #endif |
1da177e4 LT |
1812 | }; |
1813 | ||
cfb6eeb4 | 1814 | #ifdef CONFIG_TCP_MD5SIG |
b6332e6c | 1815 | static struct tcp_sock_af_ops tcp_sock_ipv4_specific = { |
cfb6eeb4 YH |
1816 | .md5_lookup = tcp_v4_md5_lookup, |
1817 | .calc_md5_hash = tcp_v4_calc_md5_hash, | |
1818 | .md5_add = tcp_v4_md5_add_func, | |
1819 | .md5_parse = tcp_v4_parse_md5_keys, | |
cfb6eeb4 | 1820 | }; |
b6332e6c | 1821 | #endif |
cfb6eeb4 | 1822 | |
1da177e4 LT |
1823 | /* NOTE: A lot of things set to zero explicitly by call to |
1824 | * sk_alloc() so need not be done here. | |
1825 | */ | |
1826 | static int tcp_v4_init_sock(struct sock *sk) | |
1827 | { | |
6687e988 | 1828 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1829 | struct tcp_sock *tp = tcp_sk(sk); |
1830 | ||
1831 | skb_queue_head_init(&tp->out_of_order_queue); | |
1832 | tcp_init_xmit_timers(sk); | |
1833 | tcp_prequeue_init(tp); | |
1834 | ||
6687e988 | 1835 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1836 | tp->mdev = TCP_TIMEOUT_INIT; |
1837 | ||
1838 | /* So many TCP implementations out there (incorrectly) count the | |
1839 | * initial SYN frame in their delayed-ACK and congestion control | |
1840 | * algorithms that we must have the following bandaid to talk | |
1841 | * efficiently to them. -DaveM | |
1842 | */ | |
1843 | tp->snd_cwnd = 2; | |
1844 | ||
1845 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1846 | * initialization of these values. | |
1847 | */ | |
1848 | tp->snd_ssthresh = 0x7fffffff; /* Infinity */ | |
1849 | tp->snd_cwnd_clamp = ~0; | |
c1b4a7e6 | 1850 | tp->mss_cache = 536; |
1da177e4 LT |
1851 | |
1852 | tp->reordering = sysctl_tcp_reordering; | |
6687e988 | 1853 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
1da177e4 LT |
1854 | |
1855 | sk->sk_state = TCP_CLOSE; | |
1856 | ||
1857 | sk->sk_write_space = sk_stream_write_space; | |
1858 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1859 | ||
8292a17a | 1860 | icsk->icsk_af_ops = &ipv4_specific; |
d83d8461 | 1861 | icsk->icsk_sync_mss = tcp_sync_mss; |
cfb6eeb4 YH |
1862 | #ifdef CONFIG_TCP_MD5SIG |
1863 | tp->af_specific = &tcp_sock_ipv4_specific; | |
1864 | #endif | |
1da177e4 LT |
1865 | |
1866 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; | |
1867 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1868 | ||
1869 | atomic_inc(&tcp_sockets_allocated); | |
1870 | ||
1871 | return 0; | |
1872 | } | |
1873 | ||
1874 | int tcp_v4_destroy_sock(struct sock *sk) | |
1875 | { | |
1876 | struct tcp_sock *tp = tcp_sk(sk); | |
1877 | ||
1878 | tcp_clear_xmit_timers(sk); | |
1879 | ||
6687e988 | 1880 | tcp_cleanup_congestion_control(sk); |
317a76f9 | 1881 | |
1da177e4 | 1882 | /* Cleanup up the write buffer. */ |
fe067e8a | 1883 | tcp_write_queue_purge(sk); |
1da177e4 LT |
1884 | |
1885 | /* Cleans up our, hopefully empty, out_of_order_queue. */ | |
e905a9ed | 1886 | __skb_queue_purge(&tp->out_of_order_queue); |
1da177e4 | 1887 | |
cfb6eeb4 YH |
1888 | #ifdef CONFIG_TCP_MD5SIG |
1889 | /* Clean up the MD5 key list, if any */ | |
1890 | if (tp->md5sig_info) { | |
1891 | tcp_v4_clear_md5_list(sk); | |
1892 | kfree(tp->md5sig_info); | |
1893 | tp->md5sig_info = NULL; | |
1894 | } | |
1895 | #endif | |
1896 | ||
1a2449a8 CL |
1897 | #ifdef CONFIG_NET_DMA |
1898 | /* Cleans up our sk_async_wait_queue */ | |
e905a9ed | 1899 | __skb_queue_purge(&sk->sk_async_wait_queue); |
1a2449a8 CL |
1900 | #endif |
1901 | ||
1da177e4 LT |
1902 | /* Clean prequeue, it must be empty really */ |
1903 | __skb_queue_purge(&tp->ucopy.prequeue); | |
1904 | ||
1905 | /* Clean up a referenced TCP bind bucket. */ | |
463c84b9 | 1906 | if (inet_csk(sk)->icsk_bind_hash) |
ab1e0a13 | 1907 | inet_put_port(sk); |
1da177e4 LT |
1908 | |
1909 | /* | |
1910 | * If sendmsg cached page exists, toss it. | |
1911 | */ | |
1912 | if (sk->sk_sndmsg_page) { | |
1913 | __free_page(sk->sk_sndmsg_page); | |
1914 | sk->sk_sndmsg_page = NULL; | |
1915 | } | |
1916 | ||
1917 | atomic_dec(&tcp_sockets_allocated); | |
1918 | ||
1919 | return 0; | |
1920 | } | |
1921 | ||
1922 | EXPORT_SYMBOL(tcp_v4_destroy_sock); | |
1923 | ||
1924 | #ifdef CONFIG_PROC_FS | |
1925 | /* Proc filesystem TCP sock list dumping. */ | |
1926 | ||
8feaf0c0 | 1927 | static inline struct inet_timewait_sock *tw_head(struct hlist_head *head) |
1da177e4 LT |
1928 | { |
1929 | return hlist_empty(head) ? NULL : | |
8feaf0c0 | 1930 | list_entry(head->first, struct inet_timewait_sock, tw_node); |
1da177e4 LT |
1931 | } |
1932 | ||
8feaf0c0 | 1933 | static inline struct inet_timewait_sock *tw_next(struct inet_timewait_sock *tw) |
1da177e4 LT |
1934 | { |
1935 | return tw->tw_node.next ? | |
1936 | hlist_entry(tw->tw_node.next, typeof(*tw), tw_node) : NULL; | |
1937 | } | |
1938 | ||
1939 | static void *listening_get_next(struct seq_file *seq, void *cur) | |
1940 | { | |
463c84b9 | 1941 | struct inet_connection_sock *icsk; |
1da177e4 LT |
1942 | struct hlist_node *node; |
1943 | struct sock *sk = cur; | |
1944 | struct tcp_iter_state* st = seq->private; | |
a4146b1b | 1945 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1946 | |
1947 | if (!sk) { | |
1948 | st->bucket = 0; | |
6e04e021 | 1949 | sk = sk_head(&tcp_hashinfo.listening_hash[0]); |
1da177e4 LT |
1950 | goto get_sk; |
1951 | } | |
1952 | ||
1953 | ++st->num; | |
1954 | ||
1955 | if (st->state == TCP_SEQ_STATE_OPENREQ) { | |
60236fdd | 1956 | struct request_sock *req = cur; |
1da177e4 | 1957 | |
72a3effa | 1958 | icsk = inet_csk(st->syn_wait_sk); |
1da177e4 LT |
1959 | req = req->dl_next; |
1960 | while (1) { | |
1961 | while (req) { | |
f40c8174 | 1962 | if (req->rsk_ops->family == st->family && |
878628fb | 1963 | net_eq(sock_net(req->sk), net)) { |
1da177e4 LT |
1964 | cur = req; |
1965 | goto out; | |
1966 | } | |
1967 | req = req->dl_next; | |
1968 | } | |
72a3effa | 1969 | if (++st->sbucket >= icsk->icsk_accept_queue.listen_opt->nr_table_entries) |
1da177e4 LT |
1970 | break; |
1971 | get_req: | |
463c84b9 | 1972 | req = icsk->icsk_accept_queue.listen_opt->syn_table[st->sbucket]; |
1da177e4 LT |
1973 | } |
1974 | sk = sk_next(st->syn_wait_sk); | |
1975 | st->state = TCP_SEQ_STATE_LISTENING; | |
463c84b9 | 1976 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 | 1977 | } else { |
e905a9ed | 1978 | icsk = inet_csk(sk); |
463c84b9 ACM |
1979 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1980 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) | |
1da177e4 | 1981 | goto start_req; |
463c84b9 | 1982 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 LT |
1983 | sk = sk_next(sk); |
1984 | } | |
1985 | get_sk: | |
1986 | sk_for_each_from(sk, node) { | |
878628fb | 1987 | if (sk->sk_family == st->family && net_eq(sock_net(sk), net)) { |
1da177e4 LT |
1988 | cur = sk; |
1989 | goto out; | |
1990 | } | |
e905a9ed | 1991 | icsk = inet_csk(sk); |
463c84b9 ACM |
1992 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1993 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) { | |
1da177e4 LT |
1994 | start_req: |
1995 | st->uid = sock_i_uid(sk); | |
1996 | st->syn_wait_sk = sk; | |
1997 | st->state = TCP_SEQ_STATE_OPENREQ; | |
1998 | st->sbucket = 0; | |
1999 | goto get_req; | |
2000 | } | |
463c84b9 | 2001 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 | 2002 | } |
0f7ff927 | 2003 | if (++st->bucket < INET_LHTABLE_SIZE) { |
6e04e021 | 2004 | sk = sk_head(&tcp_hashinfo.listening_hash[st->bucket]); |
1da177e4 LT |
2005 | goto get_sk; |
2006 | } | |
2007 | cur = NULL; | |
2008 | out: | |
2009 | return cur; | |
2010 | } | |
2011 | ||
2012 | static void *listening_get_idx(struct seq_file *seq, loff_t *pos) | |
2013 | { | |
2014 | void *rc = listening_get_next(seq, NULL); | |
2015 | ||
2016 | while (rc && *pos) { | |
2017 | rc = listening_get_next(seq, rc); | |
2018 | --*pos; | |
2019 | } | |
2020 | return rc; | |
2021 | } | |
2022 | ||
2023 | static void *established_get_first(struct seq_file *seq) | |
2024 | { | |
2025 | struct tcp_iter_state* st = seq->private; | |
a4146b1b | 2026 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2027 | void *rc = NULL; |
2028 | ||
6e04e021 | 2029 | for (st->bucket = 0; st->bucket < tcp_hashinfo.ehash_size; ++st->bucket) { |
1da177e4 LT |
2030 | struct sock *sk; |
2031 | struct hlist_node *node; | |
8feaf0c0 | 2032 | struct inet_timewait_sock *tw; |
230140cf | 2033 | rwlock_t *lock = inet_ehash_lockp(&tcp_hashinfo, st->bucket); |
1da177e4 | 2034 | |
230140cf | 2035 | read_lock_bh(lock); |
6e04e021 | 2036 | sk_for_each(sk, node, &tcp_hashinfo.ehash[st->bucket].chain) { |
f40c8174 | 2037 | if (sk->sk_family != st->family || |
878628fb | 2038 | !net_eq(sock_net(sk), net)) { |
1da177e4 LT |
2039 | continue; |
2040 | } | |
2041 | rc = sk; | |
2042 | goto out; | |
2043 | } | |
2044 | st->state = TCP_SEQ_STATE_TIME_WAIT; | |
8feaf0c0 | 2045 | inet_twsk_for_each(tw, node, |
dbca9b27 | 2046 | &tcp_hashinfo.ehash[st->bucket].twchain) { |
28518fc1 | 2047 | if (tw->tw_family != st->family || |
878628fb | 2048 | !net_eq(twsk_net(tw), net)) { |
1da177e4 LT |
2049 | continue; |
2050 | } | |
2051 | rc = tw; | |
2052 | goto out; | |
2053 | } | |
230140cf | 2054 | read_unlock_bh(lock); |
1da177e4 LT |
2055 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
2056 | } | |
2057 | out: | |
2058 | return rc; | |
2059 | } | |
2060 | ||
2061 | static void *established_get_next(struct seq_file *seq, void *cur) | |
2062 | { | |
2063 | struct sock *sk = cur; | |
8feaf0c0 | 2064 | struct inet_timewait_sock *tw; |
1da177e4 LT |
2065 | struct hlist_node *node; |
2066 | struct tcp_iter_state* st = seq->private; | |
a4146b1b | 2067 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2068 | |
2069 | ++st->num; | |
2070 | ||
2071 | if (st->state == TCP_SEQ_STATE_TIME_WAIT) { | |
2072 | tw = cur; | |
2073 | tw = tw_next(tw); | |
2074 | get_tw: | |
878628fb | 2075 | while (tw && (tw->tw_family != st->family || !net_eq(twsk_net(tw), net))) { |
1da177e4 LT |
2076 | tw = tw_next(tw); |
2077 | } | |
2078 | if (tw) { | |
2079 | cur = tw; | |
2080 | goto out; | |
2081 | } | |
230140cf | 2082 | read_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
1da177e4 LT |
2083 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
2084 | ||
6e04e021 | 2085 | if (++st->bucket < tcp_hashinfo.ehash_size) { |
230140cf | 2086 | read_lock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
6e04e021 | 2087 | sk = sk_head(&tcp_hashinfo.ehash[st->bucket].chain); |
1da177e4 LT |
2088 | } else { |
2089 | cur = NULL; | |
2090 | goto out; | |
2091 | } | |
2092 | } else | |
2093 | sk = sk_next(sk); | |
2094 | ||
2095 | sk_for_each_from(sk, node) { | |
878628fb | 2096 | if (sk->sk_family == st->family && net_eq(sock_net(sk), net)) |
1da177e4 LT |
2097 | goto found; |
2098 | } | |
2099 | ||
2100 | st->state = TCP_SEQ_STATE_TIME_WAIT; | |
dbca9b27 | 2101 | tw = tw_head(&tcp_hashinfo.ehash[st->bucket].twchain); |
1da177e4 LT |
2102 | goto get_tw; |
2103 | found: | |
2104 | cur = sk; | |
2105 | out: | |
2106 | return cur; | |
2107 | } | |
2108 | ||
2109 | static void *established_get_idx(struct seq_file *seq, loff_t pos) | |
2110 | { | |
2111 | void *rc = established_get_first(seq); | |
2112 | ||
2113 | while (rc && pos) { | |
2114 | rc = established_get_next(seq, rc); | |
2115 | --pos; | |
7174259e | 2116 | } |
1da177e4 LT |
2117 | return rc; |
2118 | } | |
2119 | ||
2120 | static void *tcp_get_idx(struct seq_file *seq, loff_t pos) | |
2121 | { | |
2122 | void *rc; | |
2123 | struct tcp_iter_state* st = seq->private; | |
2124 | ||
f3f05f70 | 2125 | inet_listen_lock(&tcp_hashinfo); |
1da177e4 LT |
2126 | st->state = TCP_SEQ_STATE_LISTENING; |
2127 | rc = listening_get_idx(seq, &pos); | |
2128 | ||
2129 | if (!rc) { | |
f3f05f70 | 2130 | inet_listen_unlock(&tcp_hashinfo); |
1da177e4 LT |
2131 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
2132 | rc = established_get_idx(seq, pos); | |
2133 | } | |
2134 | ||
2135 | return rc; | |
2136 | } | |
2137 | ||
2138 | static void *tcp_seq_start(struct seq_file *seq, loff_t *pos) | |
2139 | { | |
2140 | struct tcp_iter_state* st = seq->private; | |
2141 | st->state = TCP_SEQ_STATE_LISTENING; | |
2142 | st->num = 0; | |
2143 | return *pos ? tcp_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
2144 | } | |
2145 | ||
2146 | static void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2147 | { | |
2148 | void *rc = NULL; | |
2149 | struct tcp_iter_state* st; | |
2150 | ||
2151 | if (v == SEQ_START_TOKEN) { | |
2152 | rc = tcp_get_idx(seq, 0); | |
2153 | goto out; | |
2154 | } | |
2155 | st = seq->private; | |
2156 | ||
2157 | switch (st->state) { | |
2158 | case TCP_SEQ_STATE_OPENREQ: | |
2159 | case TCP_SEQ_STATE_LISTENING: | |
2160 | rc = listening_get_next(seq, v); | |
2161 | if (!rc) { | |
f3f05f70 | 2162 | inet_listen_unlock(&tcp_hashinfo); |
1da177e4 LT |
2163 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
2164 | rc = established_get_first(seq); | |
2165 | } | |
2166 | break; | |
2167 | case TCP_SEQ_STATE_ESTABLISHED: | |
2168 | case TCP_SEQ_STATE_TIME_WAIT: | |
2169 | rc = established_get_next(seq, v); | |
2170 | break; | |
2171 | } | |
2172 | out: | |
2173 | ++*pos; | |
2174 | return rc; | |
2175 | } | |
2176 | ||
2177 | static void tcp_seq_stop(struct seq_file *seq, void *v) | |
2178 | { | |
2179 | struct tcp_iter_state* st = seq->private; | |
2180 | ||
2181 | switch (st->state) { | |
2182 | case TCP_SEQ_STATE_OPENREQ: | |
2183 | if (v) { | |
463c84b9 ACM |
2184 | struct inet_connection_sock *icsk = inet_csk(st->syn_wait_sk); |
2185 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); | |
1da177e4 LT |
2186 | } |
2187 | case TCP_SEQ_STATE_LISTENING: | |
2188 | if (v != SEQ_START_TOKEN) | |
f3f05f70 | 2189 | inet_listen_unlock(&tcp_hashinfo); |
1da177e4 LT |
2190 | break; |
2191 | case TCP_SEQ_STATE_TIME_WAIT: | |
2192 | case TCP_SEQ_STATE_ESTABLISHED: | |
2193 | if (v) | |
230140cf | 2194 | read_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
1da177e4 LT |
2195 | break; |
2196 | } | |
2197 | } | |
2198 | ||
2199 | static int tcp_seq_open(struct inode *inode, struct file *file) | |
2200 | { | |
2201 | struct tcp_seq_afinfo *afinfo = PDE(inode)->data; | |
1da177e4 | 2202 | struct tcp_iter_state *s; |
52d6f3f1 | 2203 | int err; |
1da177e4 | 2204 | |
52d6f3f1 DL |
2205 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
2206 | sizeof(struct tcp_iter_state)); | |
2207 | if (err < 0) | |
2208 | return err; | |
f40c8174 | 2209 | |
52d6f3f1 | 2210 | s = ((struct seq_file *)file->private_data)->private; |
1da177e4 | 2211 | s->family = afinfo->family; |
f40c8174 DL |
2212 | return 0; |
2213 | } | |
2214 | ||
6f8b13bc | 2215 | int tcp_proc_register(struct net *net, struct tcp_seq_afinfo *afinfo) |
1da177e4 LT |
2216 | { |
2217 | int rc = 0; | |
2218 | struct proc_dir_entry *p; | |
2219 | ||
68fcadd1 DL |
2220 | afinfo->seq_fops.open = tcp_seq_open; |
2221 | afinfo->seq_fops.read = seq_read; | |
2222 | afinfo->seq_fops.llseek = seq_lseek; | |
2223 | afinfo->seq_fops.release = seq_release_net; | |
7174259e | 2224 | |
9427c4b3 DL |
2225 | afinfo->seq_ops.start = tcp_seq_start; |
2226 | afinfo->seq_ops.next = tcp_seq_next; | |
2227 | afinfo->seq_ops.stop = tcp_seq_stop; | |
2228 | ||
84841c3c DL |
2229 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
2230 | &afinfo->seq_fops, afinfo); | |
2231 | if (!p) | |
1da177e4 LT |
2232 | rc = -ENOMEM; |
2233 | return rc; | |
2234 | } | |
2235 | ||
6f8b13bc | 2236 | void tcp_proc_unregister(struct net *net, struct tcp_seq_afinfo *afinfo) |
1da177e4 | 2237 | { |
6f8b13bc | 2238 | proc_net_remove(net, afinfo->name); |
1da177e4 LT |
2239 | } |
2240 | ||
60236fdd | 2241 | static void get_openreq4(struct sock *sk, struct request_sock *req, |
5e659e4c | 2242 | struct seq_file *f, int i, int uid, int *len) |
1da177e4 | 2243 | { |
2e6599cb | 2244 | const struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 LT |
2245 | int ttd = req->expires - jiffies; |
2246 | ||
5e659e4c PE |
2247 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
2248 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %u %d %p%n", | |
1da177e4 | 2249 | i, |
2e6599cb | 2250 | ireq->loc_addr, |
1da177e4 | 2251 | ntohs(inet_sk(sk)->sport), |
2e6599cb ACM |
2252 | ireq->rmt_addr, |
2253 | ntohs(ireq->rmt_port), | |
1da177e4 LT |
2254 | TCP_SYN_RECV, |
2255 | 0, 0, /* could print option size, but that is af dependent. */ | |
2256 | 1, /* timers active (only the expire timer) */ | |
2257 | jiffies_to_clock_t(ttd), | |
2258 | req->retrans, | |
2259 | uid, | |
2260 | 0, /* non standard timer */ | |
2261 | 0, /* open_requests have no inode */ | |
2262 | atomic_read(&sk->sk_refcnt), | |
5e659e4c PE |
2263 | req, |
2264 | len); | |
1da177e4 LT |
2265 | } |
2266 | ||
5e659e4c | 2267 | static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i, int *len) |
1da177e4 LT |
2268 | { |
2269 | int timer_active; | |
2270 | unsigned long timer_expires; | |
cf4c6bf8 IJ |
2271 | struct tcp_sock *tp = tcp_sk(sk); |
2272 | const struct inet_connection_sock *icsk = inet_csk(sk); | |
2273 | struct inet_sock *inet = inet_sk(sk); | |
714e85be AV |
2274 | __be32 dest = inet->daddr; |
2275 | __be32 src = inet->rcv_saddr; | |
1da177e4 LT |
2276 | __u16 destp = ntohs(inet->dport); |
2277 | __u16 srcp = ntohs(inet->sport); | |
2278 | ||
463c84b9 | 2279 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
1da177e4 | 2280 | timer_active = 1; |
463c84b9 ACM |
2281 | timer_expires = icsk->icsk_timeout; |
2282 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 2283 | timer_active = 4; |
463c84b9 | 2284 | timer_expires = icsk->icsk_timeout; |
cf4c6bf8 | 2285 | } else if (timer_pending(&sk->sk_timer)) { |
1da177e4 | 2286 | timer_active = 2; |
cf4c6bf8 | 2287 | timer_expires = sk->sk_timer.expires; |
1da177e4 LT |
2288 | } else { |
2289 | timer_active = 0; | |
2290 | timer_expires = jiffies; | |
2291 | } | |
2292 | ||
5e659e4c PE |
2293 | seq_printf(f, "%4d: %08X:%04X %08X:%04X %02X %08X:%08X %02X:%08lX " |
2294 | "%08X %5d %8d %lu %d %p %u %u %u %u %d%n", | |
cf4c6bf8 | 2295 | i, src, srcp, dest, destp, sk->sk_state, |
47da8ee6 | 2296 | tp->write_seq - tp->snd_una, |
cf4c6bf8 | 2297 | sk->sk_state == TCP_LISTEN ? sk->sk_ack_backlog : |
7174259e | 2298 | (tp->rcv_nxt - tp->copied_seq), |
1da177e4 LT |
2299 | timer_active, |
2300 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 2301 | icsk->icsk_retransmits, |
cf4c6bf8 | 2302 | sock_i_uid(sk), |
6687e988 | 2303 | icsk->icsk_probes_out, |
cf4c6bf8 IJ |
2304 | sock_i_ino(sk), |
2305 | atomic_read(&sk->sk_refcnt), sk, | |
463c84b9 ACM |
2306 | icsk->icsk_rto, |
2307 | icsk->icsk_ack.ato, | |
2308 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, | |
1da177e4 | 2309 | tp->snd_cwnd, |
5e659e4c PE |
2310 | tp->snd_ssthresh >= 0xFFFF ? -1 : tp->snd_ssthresh, |
2311 | len); | |
1da177e4 LT |
2312 | } |
2313 | ||
7174259e | 2314 | static void get_timewait4_sock(struct inet_timewait_sock *tw, |
5e659e4c | 2315 | struct seq_file *f, int i, int *len) |
1da177e4 | 2316 | { |
23f33c2d | 2317 | __be32 dest, src; |
1da177e4 LT |
2318 | __u16 destp, srcp; |
2319 | int ttd = tw->tw_ttd - jiffies; | |
2320 | ||
2321 | if (ttd < 0) | |
2322 | ttd = 0; | |
2323 | ||
2324 | dest = tw->tw_daddr; | |
2325 | src = tw->tw_rcv_saddr; | |
2326 | destp = ntohs(tw->tw_dport); | |
2327 | srcp = ntohs(tw->tw_sport); | |
2328 | ||
5e659e4c PE |
2329 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
2330 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p%n", | |
1da177e4 LT |
2331 | i, src, srcp, dest, destp, tw->tw_substate, 0, 0, |
2332 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
5e659e4c | 2333 | atomic_read(&tw->tw_refcnt), tw, len); |
1da177e4 LT |
2334 | } |
2335 | ||
2336 | #define TMPSZ 150 | |
2337 | ||
2338 | static int tcp4_seq_show(struct seq_file *seq, void *v) | |
2339 | { | |
2340 | struct tcp_iter_state* st; | |
5e659e4c | 2341 | int len; |
1da177e4 LT |
2342 | |
2343 | if (v == SEQ_START_TOKEN) { | |
2344 | seq_printf(seq, "%-*s\n", TMPSZ - 1, | |
2345 | " sl local_address rem_address st tx_queue " | |
2346 | "rx_queue tr tm->when retrnsmt uid timeout " | |
2347 | "inode"); | |
2348 | goto out; | |
2349 | } | |
2350 | st = seq->private; | |
2351 | ||
2352 | switch (st->state) { | |
2353 | case TCP_SEQ_STATE_LISTENING: | |
2354 | case TCP_SEQ_STATE_ESTABLISHED: | |
5e659e4c | 2355 | get_tcp4_sock(v, seq, st->num, &len); |
1da177e4 LT |
2356 | break; |
2357 | case TCP_SEQ_STATE_OPENREQ: | |
5e659e4c | 2358 | get_openreq4(st->syn_wait_sk, v, seq, st->num, st->uid, &len); |
1da177e4 LT |
2359 | break; |
2360 | case TCP_SEQ_STATE_TIME_WAIT: | |
5e659e4c | 2361 | get_timewait4_sock(v, seq, st->num, &len); |
1da177e4 LT |
2362 | break; |
2363 | } | |
5e659e4c | 2364 | seq_printf(seq, "%*s\n", TMPSZ - 1 - len, ""); |
1da177e4 LT |
2365 | out: |
2366 | return 0; | |
2367 | } | |
2368 | ||
1da177e4 | 2369 | static struct tcp_seq_afinfo tcp4_seq_afinfo = { |
1da177e4 LT |
2370 | .name = "tcp", |
2371 | .family = AF_INET, | |
5f4472c5 DL |
2372 | .seq_fops = { |
2373 | .owner = THIS_MODULE, | |
2374 | }, | |
9427c4b3 DL |
2375 | .seq_ops = { |
2376 | .show = tcp4_seq_show, | |
2377 | }, | |
1da177e4 LT |
2378 | }; |
2379 | ||
757764f6 PE |
2380 | static int tcp4_proc_init_net(struct net *net) |
2381 | { | |
2382 | return tcp_proc_register(net, &tcp4_seq_afinfo); | |
2383 | } | |
2384 | ||
2385 | static void tcp4_proc_exit_net(struct net *net) | |
2386 | { | |
2387 | tcp_proc_unregister(net, &tcp4_seq_afinfo); | |
2388 | } | |
2389 | ||
2390 | static struct pernet_operations tcp4_net_ops = { | |
2391 | .init = tcp4_proc_init_net, | |
2392 | .exit = tcp4_proc_exit_net, | |
2393 | }; | |
2394 | ||
1da177e4 LT |
2395 | int __init tcp4_proc_init(void) |
2396 | { | |
757764f6 | 2397 | return register_pernet_subsys(&tcp4_net_ops); |
1da177e4 LT |
2398 | } |
2399 | ||
2400 | void tcp4_proc_exit(void) | |
2401 | { | |
757764f6 | 2402 | unregister_pernet_subsys(&tcp4_net_ops); |
1da177e4 LT |
2403 | } |
2404 | #endif /* CONFIG_PROC_FS */ | |
2405 | ||
2406 | struct proto tcp_prot = { | |
2407 | .name = "TCP", | |
2408 | .owner = THIS_MODULE, | |
2409 | .close = tcp_close, | |
2410 | .connect = tcp_v4_connect, | |
2411 | .disconnect = tcp_disconnect, | |
463c84b9 | 2412 | .accept = inet_csk_accept, |
1da177e4 LT |
2413 | .ioctl = tcp_ioctl, |
2414 | .init = tcp_v4_init_sock, | |
2415 | .destroy = tcp_v4_destroy_sock, | |
2416 | .shutdown = tcp_shutdown, | |
2417 | .setsockopt = tcp_setsockopt, | |
2418 | .getsockopt = tcp_getsockopt, | |
1da177e4 LT |
2419 | .recvmsg = tcp_recvmsg, |
2420 | .backlog_rcv = tcp_v4_do_rcv, | |
ab1e0a13 ACM |
2421 | .hash = inet_hash, |
2422 | .unhash = inet_unhash, | |
2423 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2424 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2425 | .sockets_allocated = &tcp_sockets_allocated, | |
0a5578cf | 2426 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2427 | .memory_allocated = &tcp_memory_allocated, |
2428 | .memory_pressure = &tcp_memory_pressure, | |
2429 | .sysctl_mem = sysctl_tcp_mem, | |
2430 | .sysctl_wmem = sysctl_tcp_wmem, | |
2431 | .sysctl_rmem = sysctl_tcp_rmem, | |
2432 | .max_header = MAX_TCP_HEADER, | |
2433 | .obj_size = sizeof(struct tcp_sock), | |
6d6ee43e | 2434 | .twsk_prot = &tcp_timewait_sock_ops, |
60236fdd | 2435 | .rsk_prot = &tcp_request_sock_ops, |
39d8cda7 | 2436 | .h.hashinfo = &tcp_hashinfo, |
543d9cfe ACM |
2437 | #ifdef CONFIG_COMPAT |
2438 | .compat_setsockopt = compat_tcp_setsockopt, | |
2439 | .compat_getsockopt = compat_tcp_getsockopt, | |
2440 | #endif | |
1da177e4 LT |
2441 | }; |
2442 | ||
046ee902 DL |
2443 | |
2444 | static int __net_init tcp_sk_init(struct net *net) | |
2445 | { | |
2446 | return inet_ctl_sock_create(&net->ipv4.tcp_sock, | |
2447 | PF_INET, SOCK_RAW, IPPROTO_TCP, net); | |
2448 | } | |
2449 | ||
2450 | static void __net_exit tcp_sk_exit(struct net *net) | |
2451 | { | |
2452 | inet_ctl_sock_destroy(net->ipv4.tcp_sock); | |
2453 | } | |
2454 | ||
2455 | static struct pernet_operations __net_initdata tcp_sk_ops = { | |
2456 | .init = tcp_sk_init, | |
2457 | .exit = tcp_sk_exit, | |
2458 | }; | |
2459 | ||
9b0f976f | 2460 | void __init tcp_v4_init(void) |
1da177e4 | 2461 | { |
046ee902 | 2462 | if (register_pernet_device(&tcp_sk_ops)) |
1da177e4 | 2463 | panic("Failed to create the TCP control socket.\n"); |
1da177e4 LT |
2464 | } |
2465 | ||
2466 | EXPORT_SYMBOL(ipv4_specific); | |
1da177e4 | 2467 | EXPORT_SYMBOL(tcp_hashinfo); |
1da177e4 | 2468 | EXPORT_SYMBOL(tcp_prot); |
1da177e4 LT |
2469 | EXPORT_SYMBOL(tcp_v4_conn_request); |
2470 | EXPORT_SYMBOL(tcp_v4_connect); | |
2471 | EXPORT_SYMBOL(tcp_v4_do_rcv); | |
1da177e4 LT |
2472 | EXPORT_SYMBOL(tcp_v4_remember_stamp); |
2473 | EXPORT_SYMBOL(tcp_v4_send_check); | |
2474 | EXPORT_SYMBOL(tcp_v4_syn_recv_sock); | |
2475 | ||
2476 | #ifdef CONFIG_PROC_FS | |
2477 | EXPORT_SYMBOL(tcp_proc_register); | |
2478 | EXPORT_SYMBOL(tcp_proc_unregister); | |
2479 | #endif | |
1da177e4 | 2480 | EXPORT_SYMBOL(sysctl_tcp_low_latency); |
1da177e4 | 2481 |