Commit | Line | Data |
---|---|---|
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 LT |
87 | |
88 | /* Check TCP sequence numbers in ICMP packets. */ | |
89 | #define ICMP_MIN_LENGTH 8 | |
90 | ||
91 | /* Socket used for sending RSTs */ | |
4103f8cd | 92 | static struct socket *tcp_socket __read_mostly; |
1da177e4 | 93 | |
8292a17a | 94 | void tcp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb); |
1da177e4 | 95 | |
cfb6eeb4 | 96 | #ifdef CONFIG_TCP_MD5SIG |
7174259e ACM |
97 | static struct tcp_md5sig_key *tcp_v4_md5_do_lookup(struct sock *sk, |
98 | __be32 addr); | |
cfb6eeb4 | 99 | static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, |
7174259e ACM |
100 | __be32 saddr, __be32 daddr, |
101 | struct tcphdr *th, int protocol, | |
9cb5734e | 102 | unsigned int tcplen); |
cfb6eeb4 YH |
103 | #endif |
104 | ||
0f7ff927 | 105 | struct inet_hashinfo __cacheline_aligned tcp_hashinfo = { |
7174259e ACM |
106 | .lhash_lock = __RW_LOCK_UNLOCKED(tcp_hashinfo.lhash_lock), |
107 | .lhash_users = ATOMIC_INIT(0), | |
108 | .lhash_wait = __WAIT_QUEUE_HEAD_INITIALIZER(tcp_hashinfo.lhash_wait), | |
1da177e4 LT |
109 | }; |
110 | ||
a94f723d | 111 | static inline __u32 tcp_v4_init_sequence(struct sk_buff *skb) |
1da177e4 | 112 | { |
eddc9ec5 ACM |
113 | return secure_tcp_sequence_number(ip_hdr(skb)->daddr, |
114 | ip_hdr(skb)->saddr, | |
aa8223c7 ACM |
115 | tcp_hdr(skb)->dest, |
116 | tcp_hdr(skb)->source); | |
1da177e4 LT |
117 | } |
118 | ||
6d6ee43e ACM |
119 | int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp) |
120 | { | |
121 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sktw); | |
122 | struct tcp_sock *tp = tcp_sk(sk); | |
123 | ||
124 | /* With PAWS, it is safe from the viewpoint | |
125 | of data integrity. Even without PAWS it is safe provided sequence | |
126 | spaces do not overlap i.e. at data rates <= 80Mbit/sec. | |
127 | ||
128 | Actually, the idea is close to VJ's one, only timestamp cache is | |
129 | held not per host, but per port pair and TW bucket is used as state | |
130 | holder. | |
131 | ||
132 | If TW bucket has been already destroyed we fall back to VJ's scheme | |
133 | and use initial timestamp retrieved from peer table. | |
134 | */ | |
135 | if (tcptw->tw_ts_recent_stamp && | |
136 | (twp == NULL || (sysctl_tcp_tw_reuse && | |
9d729f72 | 137 | get_seconds() - tcptw->tw_ts_recent_stamp > 1))) { |
6d6ee43e ACM |
138 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; |
139 | if (tp->write_seq == 0) | |
140 | tp->write_seq = 1; | |
141 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; | |
142 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; | |
143 | sock_hold(sktw); | |
144 | return 1; | |
145 | } | |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
150 | EXPORT_SYMBOL_GPL(tcp_twsk_unique); | |
151 | ||
1da177e4 LT |
152 | /* This will initiate an outgoing connection. */ |
153 | int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
154 | { | |
155 | struct inet_sock *inet = inet_sk(sk); | |
156 | struct tcp_sock *tp = tcp_sk(sk); | |
157 | struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; | |
158 | struct rtable *rt; | |
bada8adc | 159 | __be32 daddr, nexthop; |
1da177e4 LT |
160 | int tmp; |
161 | int err; | |
162 | ||
163 | if (addr_len < sizeof(struct sockaddr_in)) | |
164 | return -EINVAL; | |
165 | ||
166 | if (usin->sin_family != AF_INET) | |
167 | return -EAFNOSUPPORT; | |
168 | ||
169 | nexthop = daddr = usin->sin_addr.s_addr; | |
170 | if (inet->opt && inet->opt->srr) { | |
171 | if (!daddr) | |
172 | return -EINVAL; | |
173 | nexthop = inet->opt->faddr; | |
174 | } | |
175 | ||
176 | tmp = ip_route_connect(&rt, nexthop, inet->saddr, | |
177 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, | |
178 | IPPROTO_TCP, | |
8eb9086f | 179 | inet->sport, usin->sin_port, sk, 1); |
584bdf8c WD |
180 | if (tmp < 0) { |
181 | if (tmp == -ENETUNREACH) | |
182 | IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); | |
1da177e4 | 183 | return tmp; |
584bdf8c | 184 | } |
1da177e4 LT |
185 | |
186 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { | |
187 | ip_rt_put(rt); | |
188 | return -ENETUNREACH; | |
189 | } | |
190 | ||
191 | if (!inet->opt || !inet->opt->srr) | |
192 | daddr = rt->rt_dst; | |
193 | ||
194 | if (!inet->saddr) | |
195 | inet->saddr = rt->rt_src; | |
196 | inet->rcv_saddr = inet->saddr; | |
197 | ||
198 | if (tp->rx_opt.ts_recent_stamp && inet->daddr != daddr) { | |
199 | /* Reset inherited state */ | |
200 | tp->rx_opt.ts_recent = 0; | |
201 | tp->rx_opt.ts_recent_stamp = 0; | |
202 | tp->write_seq = 0; | |
203 | } | |
204 | ||
295ff7ed | 205 | if (tcp_death_row.sysctl_tw_recycle && |
1da177e4 LT |
206 | !tp->rx_opt.ts_recent_stamp && rt->rt_dst == daddr) { |
207 | struct inet_peer *peer = rt_get_peer(rt); | |
7174259e ACM |
208 | /* |
209 | * VJ's idea. We save last timestamp seen from | |
210 | * the destination in peer table, when entering state | |
211 | * TIME-WAIT * and initialize rx_opt.ts_recent from it, | |
212 | * when trying new connection. | |
1da177e4 | 213 | */ |
7174259e | 214 | if (peer != NULL && |
9d729f72 | 215 | peer->tcp_ts_stamp + TCP_PAWS_MSL >= get_seconds()) { |
1da177e4 LT |
216 | tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp; |
217 | tp->rx_opt.ts_recent = peer->tcp_ts; | |
218 | } | |
219 | } | |
220 | ||
221 | inet->dport = usin->sin_port; | |
222 | inet->daddr = daddr; | |
223 | ||
d83d8461 | 224 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
1da177e4 | 225 | if (inet->opt) |
d83d8461 | 226 | inet_csk(sk)->icsk_ext_hdr_len = inet->opt->optlen; |
1da177e4 LT |
227 | |
228 | tp->rx_opt.mss_clamp = 536; | |
229 | ||
230 | /* Socket identity is still unknown (sport may be zero). | |
231 | * However we set state to SYN-SENT and not releasing socket | |
232 | * lock select source port, enter ourselves into the hash tables and | |
233 | * complete initialization after this. | |
234 | */ | |
235 | tcp_set_state(sk, TCP_SYN_SENT); | |
a7f5e7f1 | 236 | err = inet_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
237 | if (err) |
238 | goto failure; | |
239 | ||
7174259e ACM |
240 | err = ip_route_newports(&rt, IPPROTO_TCP, |
241 | inet->sport, inet->dport, sk); | |
1da177e4 LT |
242 | if (err) |
243 | goto failure; | |
244 | ||
245 | /* OK, now commit destination to socket. */ | |
bcd76111 | 246 | sk->sk_gso_type = SKB_GSO_TCPV4; |
6cbb0df7 | 247 | sk_setup_caps(sk, &rt->u.dst); |
1da177e4 LT |
248 | |
249 | if (!tp->write_seq) | |
250 | tp->write_seq = secure_tcp_sequence_number(inet->saddr, | |
251 | inet->daddr, | |
252 | inet->sport, | |
253 | usin->sin_port); | |
254 | ||
255 | inet->id = tp->write_seq ^ jiffies; | |
256 | ||
257 | err = tcp_connect(sk); | |
258 | rt = NULL; | |
259 | if (err) | |
260 | goto failure; | |
261 | ||
262 | return 0; | |
263 | ||
264 | failure: | |
7174259e ACM |
265 | /* |
266 | * This unhashes the socket and releases the local port, | |
267 | * if necessary. | |
268 | */ | |
1da177e4 LT |
269 | tcp_set_state(sk, TCP_CLOSE); |
270 | ip_rt_put(rt); | |
271 | sk->sk_route_caps = 0; | |
272 | inet->dport = 0; | |
273 | return err; | |
274 | } | |
275 | ||
1da177e4 LT |
276 | /* |
277 | * This routine does path mtu discovery as defined in RFC1191. | |
278 | */ | |
40efc6fa | 279 | static void do_pmtu_discovery(struct sock *sk, struct iphdr *iph, u32 mtu) |
1da177e4 LT |
280 | { |
281 | struct dst_entry *dst; | |
282 | struct inet_sock *inet = inet_sk(sk); | |
1da177e4 LT |
283 | |
284 | /* We are not interested in TCP_LISTEN and open_requests (SYN-ACKs | |
285 | * send out by Linux are always <576bytes so they should go through | |
286 | * unfragmented). | |
287 | */ | |
288 | if (sk->sk_state == TCP_LISTEN) | |
289 | return; | |
290 | ||
291 | /* We don't check in the destentry if pmtu discovery is forbidden | |
292 | * on this route. We just assume that no packet_to_big packets | |
293 | * are send back when pmtu discovery is not active. | |
e905a9ed | 294 | * There is a small race when the user changes this flag in the |
1da177e4 LT |
295 | * route, but I think that's acceptable. |
296 | */ | |
297 | if ((dst = __sk_dst_check(sk, 0)) == NULL) | |
298 | return; | |
299 | ||
300 | dst->ops->update_pmtu(dst, mtu); | |
301 | ||
302 | /* Something is about to be wrong... Remember soft error | |
303 | * for the case, if this connection will not able to recover. | |
304 | */ | |
305 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) | |
306 | sk->sk_err_soft = EMSGSIZE; | |
307 | ||
308 | mtu = dst_mtu(dst); | |
309 | ||
310 | if (inet->pmtudisc != IP_PMTUDISC_DONT && | |
d83d8461 | 311 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
1da177e4 LT |
312 | tcp_sync_mss(sk, mtu); |
313 | ||
314 | /* Resend the TCP packet because it's | |
315 | * clear that the old packet has been | |
316 | * dropped. This is the new "fast" path mtu | |
317 | * discovery. | |
318 | */ | |
319 | tcp_simple_retransmit(sk); | |
320 | } /* else let the usual retransmit timer handle it */ | |
321 | } | |
322 | ||
323 | /* | |
324 | * This routine is called by the ICMP module when it gets some | |
325 | * sort of error condition. If err < 0 then the socket should | |
326 | * be closed and the error returned to the user. If err > 0 | |
327 | * it's just the icmp type << 8 | icmp code. After adjustment | |
328 | * header points to the first 8 bytes of the tcp header. We need | |
329 | * to find the appropriate port. | |
330 | * | |
331 | * The locking strategy used here is very "optimistic". When | |
332 | * someone else accesses the socket the ICMP is just dropped | |
333 | * and for some paths there is no check at all. | |
334 | * A more general error queue to queue errors for later handling | |
335 | * is probably better. | |
336 | * | |
337 | */ | |
338 | ||
339 | void tcp_v4_err(struct sk_buff *skb, u32 info) | |
340 | { | |
341 | struct iphdr *iph = (struct iphdr *)skb->data; | |
342 | struct tcphdr *th = (struct tcphdr *)(skb->data + (iph->ihl << 2)); | |
343 | struct tcp_sock *tp; | |
344 | struct inet_sock *inet; | |
88c7664f ACM |
345 | const int type = icmp_hdr(skb)->type; |
346 | const int code = icmp_hdr(skb)->code; | |
1da177e4 LT |
347 | struct sock *sk; |
348 | __u32 seq; | |
349 | int err; | |
350 | ||
351 | if (skb->len < (iph->ihl << 2) + 8) { | |
352 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
353 | return; | |
354 | } | |
355 | ||
c67499c0 PE |
356 | sk = inet_lookup(skb->dev->nd_net, &tcp_hashinfo, iph->daddr, th->dest, |
357 | iph->saddr, th->source, inet_iif(skb)); | |
1da177e4 LT |
358 | if (!sk) { |
359 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
360 | return; | |
361 | } | |
362 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 363 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
364 | return; |
365 | } | |
366 | ||
367 | bh_lock_sock(sk); | |
368 | /* If too many ICMPs get dropped on busy | |
369 | * servers this needs to be solved differently. | |
370 | */ | |
371 | if (sock_owned_by_user(sk)) | |
372 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
373 | ||
374 | if (sk->sk_state == TCP_CLOSE) | |
375 | goto out; | |
376 | ||
377 | tp = tcp_sk(sk); | |
378 | seq = ntohl(th->seq); | |
379 | if (sk->sk_state != TCP_LISTEN && | |
380 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
06ca719f | 381 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
382 | goto out; |
383 | } | |
384 | ||
385 | switch (type) { | |
386 | case ICMP_SOURCE_QUENCH: | |
387 | /* Just silently ignore these. */ | |
388 | goto out; | |
389 | case ICMP_PARAMETERPROB: | |
390 | err = EPROTO; | |
391 | break; | |
392 | case ICMP_DEST_UNREACH: | |
393 | if (code > NR_ICMP_UNREACH) | |
394 | goto out; | |
395 | ||
396 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ | |
397 | if (!sock_owned_by_user(sk)) | |
398 | do_pmtu_discovery(sk, iph, info); | |
399 | goto out; | |
400 | } | |
401 | ||
402 | err = icmp_err_convert[code].errno; | |
403 | break; | |
404 | case ICMP_TIME_EXCEEDED: | |
405 | err = EHOSTUNREACH; | |
406 | break; | |
407 | default: | |
408 | goto out; | |
409 | } | |
410 | ||
411 | switch (sk->sk_state) { | |
60236fdd | 412 | struct request_sock *req, **prev; |
1da177e4 LT |
413 | case TCP_LISTEN: |
414 | if (sock_owned_by_user(sk)) | |
415 | goto out; | |
416 | ||
463c84b9 ACM |
417 | req = inet_csk_search_req(sk, &prev, th->dest, |
418 | iph->daddr, iph->saddr); | |
1da177e4 LT |
419 | if (!req) |
420 | goto out; | |
421 | ||
422 | /* ICMPs are not backlogged, hence we cannot get | |
423 | an established socket here. | |
424 | */ | |
425 | BUG_TRAP(!req->sk); | |
426 | ||
2e6599cb | 427 | if (seq != tcp_rsk(req)->snt_isn) { |
1da177e4 LT |
428 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
429 | goto out; | |
430 | } | |
431 | ||
432 | /* | |
433 | * Still in SYN_RECV, just remove it silently. | |
434 | * There is no good way to pass the error to the newly | |
435 | * created socket, and POSIX does not want network | |
436 | * errors returned from accept(). | |
437 | */ | |
463c84b9 | 438 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
439 | goto out; |
440 | ||
441 | case TCP_SYN_SENT: | |
442 | case TCP_SYN_RECV: /* Cannot happen. | |
443 | It can f.e. if SYNs crossed. | |
444 | */ | |
445 | if (!sock_owned_by_user(sk)) { | |
1da177e4 LT |
446 | sk->sk_err = err; |
447 | ||
448 | sk->sk_error_report(sk); | |
449 | ||
450 | tcp_done(sk); | |
451 | } else { | |
452 | sk->sk_err_soft = err; | |
453 | } | |
454 | goto out; | |
455 | } | |
456 | ||
457 | /* If we've already connected we will keep trying | |
458 | * until we time out, or the user gives up. | |
459 | * | |
460 | * rfc1122 4.2.3.9 allows to consider as hard errors | |
461 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, | |
462 | * but it is obsoleted by pmtu discovery). | |
463 | * | |
464 | * Note, that in modern internet, where routing is unreliable | |
465 | * and in each dark corner broken firewalls sit, sending random | |
466 | * errors ordered by their masters even this two messages finally lose | |
467 | * their original sense (even Linux sends invalid PORT_UNREACHs) | |
468 | * | |
469 | * Now we are in compliance with RFCs. | |
470 | * --ANK (980905) | |
471 | */ | |
472 | ||
473 | inet = inet_sk(sk); | |
474 | if (!sock_owned_by_user(sk) && inet->recverr) { | |
475 | sk->sk_err = err; | |
476 | sk->sk_error_report(sk); | |
477 | } else { /* Only an error on timeout */ | |
478 | sk->sk_err_soft = err; | |
479 | } | |
480 | ||
481 | out: | |
482 | bh_unlock_sock(sk); | |
483 | sock_put(sk); | |
484 | } | |
485 | ||
486 | /* This routine computes an IPv4 TCP checksum. */ | |
8292a17a | 487 | void tcp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb) |
1da177e4 LT |
488 | { |
489 | struct inet_sock *inet = inet_sk(sk); | |
aa8223c7 | 490 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 491 | |
84fa7933 | 492 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
ba7808ea FD |
493 | th->check = ~tcp_v4_check(len, inet->saddr, |
494 | inet->daddr, 0); | |
663ead3b | 495 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 496 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 497 | } else { |
ba7808ea | 498 | th->check = tcp_v4_check(len, inet->saddr, inet->daddr, |
1da177e4 LT |
499 | csum_partial((char *)th, |
500 | th->doff << 2, | |
501 | skb->csum)); | |
502 | } | |
503 | } | |
504 | ||
a430a43d HX |
505 | int tcp_v4_gso_send_check(struct sk_buff *skb) |
506 | { | |
eddc9ec5 | 507 | const struct iphdr *iph; |
a430a43d HX |
508 | struct tcphdr *th; |
509 | ||
510 | if (!pskb_may_pull(skb, sizeof(*th))) | |
511 | return -EINVAL; | |
512 | ||
eddc9ec5 | 513 | iph = ip_hdr(skb); |
aa8223c7 | 514 | th = tcp_hdr(skb); |
a430a43d HX |
515 | |
516 | th->check = 0; | |
ba7808ea | 517 | th->check = ~tcp_v4_check(skb->len, iph->saddr, iph->daddr, 0); |
663ead3b | 518 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 519 | skb->csum_offset = offsetof(struct tcphdr, check); |
84fa7933 | 520 | skb->ip_summed = CHECKSUM_PARTIAL; |
a430a43d HX |
521 | return 0; |
522 | } | |
523 | ||
1da177e4 LT |
524 | /* |
525 | * This routine will send an RST to the other tcp. | |
526 | * | |
527 | * Someone asks: why I NEVER use socket parameters (TOS, TTL etc.) | |
528 | * for reset. | |
529 | * Answer: if a packet caused RST, it is not for a socket | |
530 | * existing in our system, if it is matched to a socket, | |
531 | * it is just duplicate segment or bug in other side's TCP. | |
532 | * So that we build reply only basing on parameters | |
533 | * arrived with segment. | |
534 | * Exception: precedence violation. We do not implement it in any case. | |
535 | */ | |
536 | ||
cfb6eeb4 | 537 | static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 538 | { |
aa8223c7 | 539 | struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
540 | struct { |
541 | struct tcphdr th; | |
542 | #ifdef CONFIG_TCP_MD5SIG | |
714e85be | 543 | __be32 opt[(TCPOLEN_MD5SIG_ALIGNED >> 2)]; |
cfb6eeb4 YH |
544 | #endif |
545 | } rep; | |
1da177e4 | 546 | struct ip_reply_arg arg; |
cfb6eeb4 YH |
547 | #ifdef CONFIG_TCP_MD5SIG |
548 | struct tcp_md5sig_key *key; | |
549 | #endif | |
1da177e4 LT |
550 | |
551 | /* Never send a reset in response to a reset. */ | |
552 | if (th->rst) | |
553 | return; | |
554 | ||
555 | if (((struct rtable *)skb->dst)->rt_type != RTN_LOCAL) | |
556 | return; | |
557 | ||
558 | /* Swap the send and the receive. */ | |
cfb6eeb4 YH |
559 | memset(&rep, 0, sizeof(rep)); |
560 | rep.th.dest = th->source; | |
561 | rep.th.source = th->dest; | |
562 | rep.th.doff = sizeof(struct tcphdr) / 4; | |
563 | rep.th.rst = 1; | |
1da177e4 LT |
564 | |
565 | if (th->ack) { | |
cfb6eeb4 | 566 | rep.th.seq = th->ack_seq; |
1da177e4 | 567 | } else { |
cfb6eeb4 YH |
568 | rep.th.ack = 1; |
569 | rep.th.ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin + | |
570 | skb->len - (th->doff << 2)); | |
1da177e4 LT |
571 | } |
572 | ||
7174259e | 573 | memset(&arg, 0, sizeof(arg)); |
cfb6eeb4 YH |
574 | arg.iov[0].iov_base = (unsigned char *)&rep; |
575 | arg.iov[0].iov_len = sizeof(rep.th); | |
576 | ||
577 | #ifdef CONFIG_TCP_MD5SIG | |
eddc9ec5 | 578 | key = sk ? tcp_v4_md5_do_lookup(sk, ip_hdr(skb)->daddr) : NULL; |
cfb6eeb4 YH |
579 | if (key) { |
580 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | | |
581 | (TCPOPT_NOP << 16) | | |
582 | (TCPOPT_MD5SIG << 8) | | |
583 | TCPOLEN_MD5SIG); | |
584 | /* Update length and the length the header thinks exists */ | |
585 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; | |
586 | rep.th.doff = arg.iov[0].iov_len / 4; | |
587 | ||
588 | tcp_v4_do_calc_md5_hash((__u8 *)&rep.opt[1], | |
589 | key, | |
eddc9ec5 ACM |
590 | ip_hdr(skb)->daddr, |
591 | ip_hdr(skb)->saddr, | |
cfb6eeb4 YH |
592 | &rep.th, IPPROTO_TCP, |
593 | arg.iov[0].iov_len); | |
594 | } | |
595 | #endif | |
eddc9ec5 ACM |
596 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
597 | ip_hdr(skb)->saddr, /* XXX */ | |
1da177e4 LT |
598 | sizeof(struct tcphdr), IPPROTO_TCP, 0); |
599 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; | |
600 | ||
cfb6eeb4 | 601 | ip_send_reply(tcp_socket->sk, skb, &arg, arg.iov[0].iov_len); |
1da177e4 LT |
602 | |
603 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
604 | TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); | |
605 | } | |
606 | ||
607 | /* The code following below sending ACKs in SYN-RECV and TIME-WAIT states | |
608 | outside socket context is ugly, certainly. What can I do? | |
609 | */ | |
610 | ||
cfb6eeb4 YH |
611 | static void tcp_v4_send_ack(struct tcp_timewait_sock *twsk, |
612 | struct sk_buff *skb, u32 seq, u32 ack, | |
1da177e4 LT |
613 | u32 win, u32 ts) |
614 | { | |
aa8223c7 | 615 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
616 | struct { |
617 | struct tcphdr th; | |
714e85be | 618 | __be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2) |
cfb6eeb4 | 619 | #ifdef CONFIG_TCP_MD5SIG |
714e85be | 620 | + (TCPOLEN_MD5SIG_ALIGNED >> 2) |
cfb6eeb4 YH |
621 | #endif |
622 | ]; | |
1da177e4 LT |
623 | } rep; |
624 | struct ip_reply_arg arg; | |
cfb6eeb4 YH |
625 | #ifdef CONFIG_TCP_MD5SIG |
626 | struct tcp_md5sig_key *key; | |
627 | struct tcp_md5sig_key tw_key; | |
628 | #endif | |
1da177e4 LT |
629 | |
630 | memset(&rep.th, 0, sizeof(struct tcphdr)); | |
7174259e | 631 | memset(&arg, 0, sizeof(arg)); |
1da177e4 LT |
632 | |
633 | arg.iov[0].iov_base = (unsigned char *)&rep; | |
634 | arg.iov[0].iov_len = sizeof(rep.th); | |
635 | if (ts) { | |
cfb6eeb4 YH |
636 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
637 | (TCPOPT_TIMESTAMP << 8) | | |
638 | TCPOLEN_TIMESTAMP); | |
639 | rep.opt[1] = htonl(tcp_time_stamp); | |
640 | rep.opt[2] = htonl(ts); | |
cb48cfe8 | 641 | arg.iov[0].iov_len += TCPOLEN_TSTAMP_ALIGNED; |
1da177e4 LT |
642 | } |
643 | ||
644 | /* Swap the send and the receive. */ | |
645 | rep.th.dest = th->source; | |
646 | rep.th.source = th->dest; | |
647 | rep.th.doff = arg.iov[0].iov_len / 4; | |
648 | rep.th.seq = htonl(seq); | |
649 | rep.th.ack_seq = htonl(ack); | |
650 | rep.th.ack = 1; | |
651 | rep.th.window = htons(win); | |
652 | ||
cfb6eeb4 YH |
653 | #ifdef CONFIG_TCP_MD5SIG |
654 | /* | |
655 | * The SKB holds an imcoming packet, but may not have a valid ->sk | |
656 | * pointer. This is especially the case when we're dealing with a | |
657 | * TIME_WAIT ack, because the sk structure is long gone, and only | |
658 | * the tcp_timewait_sock remains. So the md5 key is stashed in that | |
659 | * structure, and we use it in preference. I believe that (twsk || | |
660 | * skb->sk) holds true, but we program defensively. | |
661 | */ | |
662 | if (!twsk && skb->sk) { | |
eddc9ec5 | 663 | key = tcp_v4_md5_do_lookup(skb->sk, ip_hdr(skb)->daddr); |
cfb6eeb4 YH |
664 | } else if (twsk && twsk->tw_md5_keylen) { |
665 | tw_key.key = twsk->tw_md5_key; | |
666 | tw_key.keylen = twsk->tw_md5_keylen; | |
667 | key = &tw_key; | |
7174259e | 668 | } else |
cfb6eeb4 | 669 | key = NULL; |
cfb6eeb4 YH |
670 | |
671 | if (key) { | |
672 | int offset = (ts) ? 3 : 0; | |
673 | ||
674 | rep.opt[offset++] = htonl((TCPOPT_NOP << 24) | | |
675 | (TCPOPT_NOP << 16) | | |
676 | (TCPOPT_MD5SIG << 8) | | |
677 | TCPOLEN_MD5SIG); | |
678 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; | |
679 | rep.th.doff = arg.iov[0].iov_len/4; | |
680 | ||
681 | tcp_v4_do_calc_md5_hash((__u8 *)&rep.opt[offset], | |
682 | key, | |
eddc9ec5 ACM |
683 | ip_hdr(skb)->daddr, |
684 | ip_hdr(skb)->saddr, | |
cfb6eeb4 YH |
685 | &rep.th, IPPROTO_TCP, |
686 | arg.iov[0].iov_len); | |
687 | } | |
688 | #endif | |
eddc9ec5 ACM |
689 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
690 | ip_hdr(skb)->saddr, /* XXX */ | |
1da177e4 LT |
691 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
692 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; | |
f0e48dbf PM |
693 | if (twsk) |
694 | arg.bound_dev_if = twsk->tw_sk.tw_bound_dev_if; | |
1da177e4 LT |
695 | |
696 | ip_send_reply(tcp_socket->sk, skb, &arg, arg.iov[0].iov_len); | |
697 | ||
698 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
699 | } | |
700 | ||
701 | static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
702 | { | |
8feaf0c0 | 703 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 704 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 705 | |
cfb6eeb4 | 706 | tcp_v4_send_ack(tcptw, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
7174259e ACM |
707 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
708 | tcptw->tw_ts_recent); | |
1da177e4 | 709 | |
8feaf0c0 | 710 | inet_twsk_put(tw); |
1da177e4 LT |
711 | } |
712 | ||
7174259e ACM |
713 | static void tcp_v4_reqsk_send_ack(struct sk_buff *skb, |
714 | struct request_sock *req) | |
1da177e4 | 715 | { |
cfb6eeb4 YH |
716 | tcp_v4_send_ack(NULL, skb, tcp_rsk(req)->snt_isn + 1, |
717 | tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, | |
1da177e4 LT |
718 | req->ts_recent); |
719 | } | |
720 | ||
1da177e4 LT |
721 | /* |
722 | * Send a SYN-ACK after having received an ACK. | |
60236fdd | 723 | * This still operates on a request_sock only, not on a big |
1da177e4 LT |
724 | * socket. |
725 | */ | |
60236fdd | 726 | static int tcp_v4_send_synack(struct sock *sk, struct request_sock *req, |
1da177e4 LT |
727 | struct dst_entry *dst) |
728 | { | |
2e6599cb | 729 | const struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 LT |
730 | int err = -1; |
731 | struct sk_buff * skb; | |
732 | ||
733 | /* First, grab a route. */ | |
463c84b9 | 734 | if (!dst && (dst = inet_csk_route_req(sk, req)) == NULL) |
1da177e4 LT |
735 | goto out; |
736 | ||
737 | skb = tcp_make_synack(sk, dst, req); | |
738 | ||
739 | if (skb) { | |
aa8223c7 | 740 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 741 | |
ba7808ea | 742 | th->check = tcp_v4_check(skb->len, |
2e6599cb ACM |
743 | ireq->loc_addr, |
744 | ireq->rmt_addr, | |
1da177e4 LT |
745 | csum_partial((char *)th, skb->len, |
746 | skb->csum)); | |
747 | ||
2e6599cb ACM |
748 | err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, |
749 | ireq->rmt_addr, | |
750 | ireq->opt); | |
b9df3cb8 | 751 | err = net_xmit_eval(err); |
1da177e4 LT |
752 | } |
753 | ||
754 | out: | |
755 | dst_release(dst); | |
756 | return err; | |
757 | } | |
758 | ||
759 | /* | |
60236fdd | 760 | * IPv4 request_sock destructor. |
1da177e4 | 761 | */ |
60236fdd | 762 | static void tcp_v4_reqsk_destructor(struct request_sock *req) |
1da177e4 | 763 | { |
a51482bd | 764 | kfree(inet_rsk(req)->opt); |
1da177e4 LT |
765 | } |
766 | ||
80e40daa | 767 | #ifdef CONFIG_SYN_COOKIES |
40efc6fa | 768 | static void syn_flood_warning(struct sk_buff *skb) |
1da177e4 LT |
769 | { |
770 | static unsigned long warntime; | |
771 | ||
772 | if (time_after(jiffies, (warntime + HZ * 60))) { | |
773 | warntime = jiffies; | |
774 | printk(KERN_INFO | |
775 | "possible SYN flooding on port %d. Sending cookies.\n", | |
aa8223c7 | 776 | ntohs(tcp_hdr(skb)->dest)); |
1da177e4 LT |
777 | } |
778 | } | |
80e40daa | 779 | #endif |
1da177e4 LT |
780 | |
781 | /* | |
60236fdd | 782 | * Save and compile IPv4 options into the request_sock if needed. |
1da177e4 | 783 | */ |
40efc6fa SH |
784 | static struct ip_options *tcp_v4_save_options(struct sock *sk, |
785 | struct sk_buff *skb) | |
1da177e4 LT |
786 | { |
787 | struct ip_options *opt = &(IPCB(skb)->opt); | |
788 | struct ip_options *dopt = NULL; | |
789 | ||
790 | if (opt && opt->optlen) { | |
791 | int opt_size = optlength(opt); | |
792 | dopt = kmalloc(opt_size, GFP_ATOMIC); | |
793 | if (dopt) { | |
794 | if (ip_options_echo(dopt, skb)) { | |
795 | kfree(dopt); | |
796 | dopt = NULL; | |
797 | } | |
798 | } | |
799 | } | |
800 | return dopt; | |
801 | } | |
802 | ||
cfb6eeb4 YH |
803 | #ifdef CONFIG_TCP_MD5SIG |
804 | /* | |
805 | * RFC2385 MD5 checksumming requires a mapping of | |
806 | * IP address->MD5 Key. | |
807 | * We need to maintain these in the sk structure. | |
808 | */ | |
809 | ||
810 | /* Find the Key structure for an address. */ | |
7174259e ACM |
811 | static struct tcp_md5sig_key * |
812 | tcp_v4_md5_do_lookup(struct sock *sk, __be32 addr) | |
cfb6eeb4 YH |
813 | { |
814 | struct tcp_sock *tp = tcp_sk(sk); | |
815 | int i; | |
816 | ||
817 | if (!tp->md5sig_info || !tp->md5sig_info->entries4) | |
818 | return NULL; | |
819 | for (i = 0; i < tp->md5sig_info->entries4; i++) { | |
820 | if (tp->md5sig_info->keys4[i].addr == addr) | |
f8ab18d2 | 821 | return &tp->md5sig_info->keys4[i].base; |
cfb6eeb4 YH |
822 | } |
823 | return NULL; | |
824 | } | |
825 | ||
826 | struct tcp_md5sig_key *tcp_v4_md5_lookup(struct sock *sk, | |
827 | struct sock *addr_sk) | |
828 | { | |
829 | return tcp_v4_md5_do_lookup(sk, inet_sk(addr_sk)->daddr); | |
830 | } | |
831 | ||
832 | EXPORT_SYMBOL(tcp_v4_md5_lookup); | |
833 | ||
f5b99bcd AB |
834 | static struct tcp_md5sig_key *tcp_v4_reqsk_md5_lookup(struct sock *sk, |
835 | struct request_sock *req) | |
cfb6eeb4 YH |
836 | { |
837 | return tcp_v4_md5_do_lookup(sk, inet_rsk(req)->rmt_addr); | |
838 | } | |
839 | ||
840 | /* This can be called on a newly created socket, from other files */ | |
841 | int tcp_v4_md5_do_add(struct sock *sk, __be32 addr, | |
842 | u8 *newkey, u8 newkeylen) | |
843 | { | |
844 | /* Add Key to the list */ | |
b0a713e9 | 845 | struct tcp_md5sig_key *key; |
cfb6eeb4 YH |
846 | struct tcp_sock *tp = tcp_sk(sk); |
847 | struct tcp4_md5sig_key *keys; | |
848 | ||
b0a713e9 | 849 | key = tcp_v4_md5_do_lookup(sk, addr); |
cfb6eeb4 YH |
850 | if (key) { |
851 | /* Pre-existing entry - just update that one. */ | |
b0a713e9 MD |
852 | kfree(key->key); |
853 | key->key = newkey; | |
854 | key->keylen = newkeylen; | |
cfb6eeb4 | 855 | } else { |
f6685938 ACM |
856 | struct tcp_md5sig_info *md5sig; |
857 | ||
cfb6eeb4 | 858 | if (!tp->md5sig_info) { |
f6685938 ACM |
859 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), |
860 | GFP_ATOMIC); | |
cfb6eeb4 YH |
861 | if (!tp->md5sig_info) { |
862 | kfree(newkey); | |
863 | return -ENOMEM; | |
864 | } | |
3d7dbeac | 865 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 YH |
866 | } |
867 | if (tcp_alloc_md5sig_pool() == NULL) { | |
868 | kfree(newkey); | |
869 | return -ENOMEM; | |
870 | } | |
f6685938 ACM |
871 | md5sig = tp->md5sig_info; |
872 | ||
873 | if (md5sig->alloced4 == md5sig->entries4) { | |
874 | keys = kmalloc((sizeof(*keys) * | |
e905a9ed | 875 | (md5sig->entries4 + 1)), GFP_ATOMIC); |
cfb6eeb4 YH |
876 | if (!keys) { |
877 | kfree(newkey); | |
878 | tcp_free_md5sig_pool(); | |
879 | return -ENOMEM; | |
880 | } | |
881 | ||
f6685938 ACM |
882 | if (md5sig->entries4) |
883 | memcpy(keys, md5sig->keys4, | |
884 | sizeof(*keys) * md5sig->entries4); | |
cfb6eeb4 YH |
885 | |
886 | /* Free old key list, and reference new one */ | |
a80cc20d | 887 | kfree(md5sig->keys4); |
f6685938 ACM |
888 | md5sig->keys4 = keys; |
889 | md5sig->alloced4++; | |
cfb6eeb4 | 890 | } |
f6685938 | 891 | md5sig->entries4++; |
f8ab18d2 DM |
892 | md5sig->keys4[md5sig->entries4 - 1].addr = addr; |
893 | md5sig->keys4[md5sig->entries4 - 1].base.key = newkey; | |
894 | md5sig->keys4[md5sig->entries4 - 1].base.keylen = newkeylen; | |
cfb6eeb4 YH |
895 | } |
896 | return 0; | |
897 | } | |
898 | ||
899 | EXPORT_SYMBOL(tcp_v4_md5_do_add); | |
900 | ||
901 | static int tcp_v4_md5_add_func(struct sock *sk, struct sock *addr_sk, | |
902 | u8 *newkey, u8 newkeylen) | |
903 | { | |
904 | return tcp_v4_md5_do_add(sk, inet_sk(addr_sk)->daddr, | |
905 | newkey, newkeylen); | |
906 | } | |
907 | ||
908 | int tcp_v4_md5_do_del(struct sock *sk, __be32 addr) | |
909 | { | |
910 | struct tcp_sock *tp = tcp_sk(sk); | |
911 | int i; | |
912 | ||
913 | for (i = 0; i < tp->md5sig_info->entries4; i++) { | |
914 | if (tp->md5sig_info->keys4[i].addr == addr) { | |
915 | /* Free the key */ | |
f8ab18d2 | 916 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
917 | tp->md5sig_info->entries4--; |
918 | ||
919 | if (tp->md5sig_info->entries4 == 0) { | |
920 | kfree(tp->md5sig_info->keys4); | |
921 | tp->md5sig_info->keys4 = NULL; | |
8228a18d | 922 | tp->md5sig_info->alloced4 = 0; |
7174259e | 923 | } else if (tp->md5sig_info->entries4 != i) { |
cfb6eeb4 | 924 | /* Need to do some manipulation */ |
354faf09 YH |
925 | memmove(&tp->md5sig_info->keys4[i], |
926 | &tp->md5sig_info->keys4[i+1], | |
927 | (tp->md5sig_info->entries4 - i) * | |
928 | sizeof(struct tcp4_md5sig_key)); | |
cfb6eeb4 YH |
929 | } |
930 | tcp_free_md5sig_pool(); | |
931 | return 0; | |
932 | } | |
933 | } | |
934 | return -ENOENT; | |
935 | } | |
936 | ||
937 | EXPORT_SYMBOL(tcp_v4_md5_do_del); | |
938 | ||
7174259e | 939 | static void tcp_v4_clear_md5_list(struct sock *sk) |
cfb6eeb4 YH |
940 | { |
941 | struct tcp_sock *tp = tcp_sk(sk); | |
942 | ||
943 | /* Free each key, then the set of key keys, | |
944 | * the crypto element, and then decrement our | |
945 | * hold on the last resort crypto. | |
946 | */ | |
947 | if (tp->md5sig_info->entries4) { | |
948 | int i; | |
949 | for (i = 0; i < tp->md5sig_info->entries4; i++) | |
f8ab18d2 | 950 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
951 | tp->md5sig_info->entries4 = 0; |
952 | tcp_free_md5sig_pool(); | |
953 | } | |
954 | if (tp->md5sig_info->keys4) { | |
955 | kfree(tp->md5sig_info->keys4); | |
956 | tp->md5sig_info->keys4 = NULL; | |
957 | tp->md5sig_info->alloced4 = 0; | |
958 | } | |
959 | } | |
960 | ||
7174259e ACM |
961 | static int tcp_v4_parse_md5_keys(struct sock *sk, char __user *optval, |
962 | int optlen) | |
cfb6eeb4 YH |
963 | { |
964 | struct tcp_md5sig cmd; | |
965 | struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr; | |
966 | u8 *newkey; | |
967 | ||
968 | if (optlen < sizeof(cmd)) | |
969 | return -EINVAL; | |
970 | ||
7174259e | 971 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
cfb6eeb4 YH |
972 | return -EFAULT; |
973 | ||
974 | if (sin->sin_family != AF_INET) | |
975 | return -EINVAL; | |
976 | ||
977 | if (!cmd.tcpm_key || !cmd.tcpm_keylen) { | |
978 | if (!tcp_sk(sk)->md5sig_info) | |
979 | return -ENOENT; | |
980 | return tcp_v4_md5_do_del(sk, sin->sin_addr.s_addr); | |
981 | } | |
982 | ||
983 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
984 | return -EINVAL; | |
985 | ||
986 | if (!tcp_sk(sk)->md5sig_info) { | |
987 | struct tcp_sock *tp = tcp_sk(sk); | |
7174259e | 988 | struct tcp_md5sig_info *p = kzalloc(sizeof(*p), GFP_KERNEL); |
cfb6eeb4 | 989 | |
cfb6eeb4 YH |
990 | if (!p) |
991 | return -EINVAL; | |
992 | ||
993 | tp->md5sig_info = p; | |
3d7dbeac | 994 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 YH |
995 | } |
996 | ||
f6685938 | 997 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
998 | if (!newkey) |
999 | return -ENOMEM; | |
cfb6eeb4 YH |
1000 | return tcp_v4_md5_do_add(sk, sin->sin_addr.s_addr, |
1001 | newkey, cmd.tcpm_keylen); | |
1002 | } | |
1003 | ||
1004 | static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, | |
1005 | __be32 saddr, __be32 daddr, | |
1006 | struct tcphdr *th, int protocol, | |
9cb5734e | 1007 | unsigned int tcplen) |
cfb6eeb4 YH |
1008 | { |
1009 | struct scatterlist sg[4]; | |
1010 | __u16 data_len; | |
1011 | int block = 0; | |
8e5200f5 | 1012 | __sum16 old_checksum; |
cfb6eeb4 YH |
1013 | struct tcp_md5sig_pool *hp; |
1014 | struct tcp4_pseudohdr *bp; | |
1015 | struct hash_desc *desc; | |
1016 | int err; | |
1017 | unsigned int nbytes = 0; | |
1018 | ||
1019 | /* | |
1020 | * Okay, so RFC2385 is turned on for this connection, | |
1021 | * so we need to generate the MD5 hash for the packet now. | |
1022 | */ | |
1023 | ||
1024 | hp = tcp_get_md5sig_pool(); | |
1025 | if (!hp) | |
1026 | goto clear_hash_noput; | |
1027 | ||
1028 | bp = &hp->md5_blk.ip4; | |
1029 | desc = &hp->md5_desc; | |
1030 | ||
1031 | /* | |
1032 | * 1. the TCP pseudo-header (in the order: source IP address, | |
1033 | * destination IP address, zero-padded protocol number, and | |
1034 | * segment length) | |
1035 | */ | |
1036 | bp->saddr = saddr; | |
1037 | bp->daddr = daddr; | |
1038 | bp->pad = 0; | |
1039 | bp->protocol = protocol; | |
1040 | bp->len = htons(tcplen); | |
c7da57a1 DM |
1041 | |
1042 | sg_init_table(sg, 4); | |
1043 | ||
cfb6eeb4 YH |
1044 | sg_set_buf(&sg[block++], bp, sizeof(*bp)); |
1045 | nbytes += sizeof(*bp); | |
1046 | ||
cfb6eeb4 YH |
1047 | /* 2. the TCP header, excluding options, and assuming a |
1048 | * checksum of zero/ | |
1049 | */ | |
1050 | old_checksum = th->check; | |
1051 | th->check = 0; | |
1052 | sg_set_buf(&sg[block++], th, sizeof(struct tcphdr)); | |
1053 | nbytes += sizeof(struct tcphdr); | |
08dd1a50 | 1054 | |
cfb6eeb4 YH |
1055 | /* 3. the TCP segment data (if any) */ |
1056 | data_len = tcplen - (th->doff << 2); | |
1057 | if (data_len > 0) { | |
1058 | unsigned char *data = (unsigned char *)th + (th->doff << 2); | |
1059 | sg_set_buf(&sg[block++], data, data_len); | |
1060 | nbytes += data_len; | |
1061 | } | |
1062 | ||
1063 | /* 4. an independently-specified key or password, known to both | |
1064 | * TCPs and presumably connection-specific | |
1065 | */ | |
1066 | sg_set_buf(&sg[block++], key->key, key->keylen); | |
1067 | nbytes += key->keylen; | |
1068 | ||
c46f2334 | 1069 | sg_mark_end(&sg[block - 1]); |
c7da57a1 | 1070 | |
cfb6eeb4 YH |
1071 | /* Now store the Hash into the packet */ |
1072 | err = crypto_hash_init(desc); | |
1073 | if (err) | |
1074 | goto clear_hash; | |
1075 | err = crypto_hash_update(desc, sg, nbytes); | |
1076 | if (err) | |
1077 | goto clear_hash; | |
1078 | err = crypto_hash_final(desc, md5_hash); | |
1079 | if (err) | |
1080 | goto clear_hash; | |
1081 | ||
1082 | /* Reset header, and free up the crypto */ | |
1083 | tcp_put_md5sig_pool(); | |
1084 | th->check = old_checksum; | |
1085 | ||
1086 | out: | |
cfb6eeb4 YH |
1087 | return 0; |
1088 | clear_hash: | |
1089 | tcp_put_md5sig_pool(); | |
1090 | clear_hash_noput: | |
1091 | memset(md5_hash, 0, 16); | |
1092 | goto out; | |
1093 | } | |
1094 | ||
1095 | int tcp_v4_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, | |
1096 | struct sock *sk, | |
1097 | struct dst_entry *dst, | |
1098 | struct request_sock *req, | |
1099 | struct tcphdr *th, int protocol, | |
9cb5734e | 1100 | unsigned int tcplen) |
cfb6eeb4 YH |
1101 | { |
1102 | __be32 saddr, daddr; | |
1103 | ||
1104 | if (sk) { | |
1105 | saddr = inet_sk(sk)->saddr; | |
1106 | daddr = inet_sk(sk)->daddr; | |
1107 | } else { | |
1108 | struct rtable *rt = (struct rtable *)dst; | |
1109 | BUG_ON(!rt); | |
1110 | saddr = rt->rt_src; | |
1111 | daddr = rt->rt_dst; | |
1112 | } | |
1113 | return tcp_v4_do_calc_md5_hash(md5_hash, key, | |
1114 | saddr, daddr, | |
1115 | th, protocol, tcplen); | |
1116 | } | |
1117 | ||
1118 | EXPORT_SYMBOL(tcp_v4_calc_md5_hash); | |
1119 | ||
7174259e | 1120 | static int tcp_v4_inbound_md5_hash(struct sock *sk, struct sk_buff *skb) |
cfb6eeb4 YH |
1121 | { |
1122 | /* | |
1123 | * This gets called for each TCP segment that arrives | |
1124 | * so we want to be efficient. | |
1125 | * We have 3 drop cases: | |
1126 | * o No MD5 hash and one expected. | |
1127 | * o MD5 hash and we're not expecting one. | |
1128 | * o MD5 hash and its wrong. | |
1129 | */ | |
1130 | __u8 *hash_location = NULL; | |
1131 | struct tcp_md5sig_key *hash_expected; | |
eddc9ec5 | 1132 | const struct iphdr *iph = ip_hdr(skb); |
aa8223c7 | 1133 | struct tcphdr *th = tcp_hdr(skb); |
7174259e | 1134 | int length = (th->doff << 2) - sizeof(struct tcphdr); |
cfb6eeb4 YH |
1135 | int genhash; |
1136 | unsigned char *ptr; | |
1137 | unsigned char newhash[16]; | |
1138 | ||
1139 | hash_expected = tcp_v4_md5_do_lookup(sk, iph->saddr); | |
1140 | ||
1141 | /* | |
1142 | * If the TCP option length is less than the TCP_MD5SIG | |
1143 | * option length, then we can shortcut | |
1144 | */ | |
1145 | if (length < TCPOLEN_MD5SIG) { | |
1146 | if (hash_expected) | |
1147 | return 1; | |
1148 | else | |
1149 | return 0; | |
1150 | } | |
1151 | ||
1152 | /* Okay, we can't shortcut - we have to grub through the options */ | |
1153 | ptr = (unsigned char *)(th + 1); | |
1154 | while (length > 0) { | |
1155 | int opcode = *ptr++; | |
1156 | int opsize; | |
1157 | ||
1158 | switch (opcode) { | |
1159 | case TCPOPT_EOL: | |
1160 | goto done_opts; | |
1161 | case TCPOPT_NOP: | |
1162 | length--; | |
1163 | continue; | |
1164 | default: | |
1165 | opsize = *ptr++; | |
1166 | if (opsize < 2) | |
1167 | goto done_opts; | |
1168 | if (opsize > length) | |
1169 | goto done_opts; | |
1170 | ||
1171 | if (opcode == TCPOPT_MD5SIG) { | |
1172 | hash_location = ptr; | |
1173 | goto done_opts; | |
1174 | } | |
1175 | } | |
1176 | ptr += opsize-2; | |
1177 | length -= opsize; | |
1178 | } | |
1179 | done_opts: | |
1180 | /* We've parsed the options - do we have a hash? */ | |
1181 | if (!hash_expected && !hash_location) | |
1182 | return 0; | |
1183 | ||
1184 | if (hash_expected && !hash_location) { | |
a9fc00cc | 1185 | LIMIT_NETDEBUG(KERN_INFO "MD5 Hash expected but NOT found " |
cfb6eeb4 | 1186 | "(" NIPQUAD_FMT ", %d)->(" NIPQUAD_FMT ", %d)\n", |
7174259e ACM |
1187 | NIPQUAD(iph->saddr), ntohs(th->source), |
1188 | NIPQUAD(iph->daddr), ntohs(th->dest)); | |
cfb6eeb4 YH |
1189 | return 1; |
1190 | } | |
1191 | ||
1192 | if (!hash_expected && hash_location) { | |
7174259e | 1193 | LIMIT_NETDEBUG(KERN_INFO "MD5 Hash NOT expected but found " |
cfb6eeb4 | 1194 | "(" NIPQUAD_FMT ", %d)->(" NIPQUAD_FMT ", %d)\n", |
7174259e ACM |
1195 | NIPQUAD(iph->saddr), ntohs(th->source), |
1196 | NIPQUAD(iph->daddr), ntohs(th->dest)); | |
cfb6eeb4 YH |
1197 | return 1; |
1198 | } | |
1199 | ||
1200 | /* Okay, so this is hash_expected and hash_location - | |
1201 | * so we need to calculate the checksum. | |
1202 | */ | |
1203 | genhash = tcp_v4_do_calc_md5_hash(newhash, | |
1204 | hash_expected, | |
1205 | iph->saddr, iph->daddr, | |
1206 | th, sk->sk_protocol, | |
1207 | skb->len); | |
1208 | ||
1209 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { | |
1210 | if (net_ratelimit()) { | |
1211 | printk(KERN_INFO "MD5 Hash failed for " | |
1212 | "(" NIPQUAD_FMT ", %d)->(" NIPQUAD_FMT ", %d)%s\n", | |
7174259e ACM |
1213 | NIPQUAD(iph->saddr), ntohs(th->source), |
1214 | NIPQUAD(iph->daddr), ntohs(th->dest), | |
cfb6eeb4 | 1215 | genhash ? " tcp_v4_calc_md5_hash failed" : ""); |
cfb6eeb4 YH |
1216 | } |
1217 | return 1; | |
1218 | } | |
1219 | return 0; | |
1220 | } | |
1221 | ||
1222 | #endif | |
1223 | ||
72a3effa | 1224 | struct request_sock_ops tcp_request_sock_ops __read_mostly = { |
1da177e4 | 1225 | .family = PF_INET, |
2e6599cb | 1226 | .obj_size = sizeof(struct tcp_request_sock), |
1da177e4 | 1227 | .rtx_syn_ack = tcp_v4_send_synack, |
60236fdd ACM |
1228 | .send_ack = tcp_v4_reqsk_send_ack, |
1229 | .destructor = tcp_v4_reqsk_destructor, | |
1da177e4 LT |
1230 | .send_reset = tcp_v4_send_reset, |
1231 | }; | |
1232 | ||
cfb6eeb4 | 1233 | #ifdef CONFIG_TCP_MD5SIG |
b6332e6c | 1234 | static struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = { |
cfb6eeb4 | 1235 | .md5_lookup = tcp_v4_reqsk_md5_lookup, |
cfb6eeb4 | 1236 | }; |
b6332e6c | 1237 | #endif |
cfb6eeb4 | 1238 | |
6d6ee43e ACM |
1239 | static struct timewait_sock_ops tcp_timewait_sock_ops = { |
1240 | .twsk_obj_size = sizeof(struct tcp_timewait_sock), | |
1241 | .twsk_unique = tcp_twsk_unique, | |
cfb6eeb4 | 1242 | .twsk_destructor= tcp_twsk_destructor, |
6d6ee43e ACM |
1243 | }; |
1244 | ||
1da177e4 LT |
1245 | int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) |
1246 | { | |
2e6599cb | 1247 | struct inet_request_sock *ireq; |
1da177e4 | 1248 | struct tcp_options_received tmp_opt; |
60236fdd | 1249 | struct request_sock *req; |
eddc9ec5 ACM |
1250 | __be32 saddr = ip_hdr(skb)->saddr; |
1251 | __be32 daddr = ip_hdr(skb)->daddr; | |
1da177e4 LT |
1252 | __u32 isn = TCP_SKB_CB(skb)->when; |
1253 | struct dst_entry *dst = NULL; | |
1254 | #ifdef CONFIG_SYN_COOKIES | |
1255 | int want_cookie = 0; | |
1256 | #else | |
1257 | #define want_cookie 0 /* Argh, why doesn't gcc optimize this :( */ | |
1258 | #endif | |
1259 | ||
1260 | /* Never answer to SYNs send to broadcast or multicast */ | |
1261 | if (((struct rtable *)skb->dst)->rt_flags & | |
1262 | (RTCF_BROADCAST | RTCF_MULTICAST)) | |
1263 | goto drop; | |
1264 | ||
1265 | /* TW buckets are converted to open requests without | |
1266 | * limitations, they conserve resources and peer is | |
1267 | * evidently real one. | |
1268 | */ | |
463c84b9 | 1269 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 LT |
1270 | #ifdef CONFIG_SYN_COOKIES |
1271 | if (sysctl_tcp_syncookies) { | |
1272 | want_cookie = 1; | |
1273 | } else | |
1274 | #endif | |
1275 | goto drop; | |
1276 | } | |
1277 | ||
1278 | /* Accept backlog is full. If we have already queued enough | |
1279 | * of warm entries in syn queue, drop request. It is better than | |
1280 | * clogging syn queue with openreqs with exponentially increasing | |
1281 | * timeout. | |
1282 | */ | |
463c84b9 | 1283 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1284 | goto drop; |
1285 | ||
60236fdd | 1286 | req = reqsk_alloc(&tcp_request_sock_ops); |
1da177e4 LT |
1287 | if (!req) |
1288 | goto drop; | |
1289 | ||
cfb6eeb4 YH |
1290 | #ifdef CONFIG_TCP_MD5SIG |
1291 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv4_ops; | |
1292 | #endif | |
1293 | ||
1da177e4 LT |
1294 | tcp_clear_options(&tmp_opt); |
1295 | tmp_opt.mss_clamp = 536; | |
1296 | tmp_opt.user_mss = tcp_sk(sk)->rx_opt.user_mss; | |
1297 | ||
1298 | tcp_parse_options(skb, &tmp_opt, 0); | |
1299 | ||
1300 | if (want_cookie) { | |
1301 | tcp_clear_options(&tmp_opt); | |
1302 | tmp_opt.saw_tstamp = 0; | |
1303 | } | |
1304 | ||
1305 | if (tmp_opt.saw_tstamp && !tmp_opt.rcv_tsval) { | |
1306 | /* Some OSes (unknown ones, but I see them on web server, which | |
1307 | * contains information interesting only for windows' | |
1308 | * users) do not send their stamp in SYN. It is easy case. | |
1309 | * We simply do not advertise TS support. | |
1310 | */ | |
1311 | tmp_opt.saw_tstamp = 0; | |
1312 | tmp_opt.tstamp_ok = 0; | |
1313 | } | |
1314 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; | |
1315 | ||
1316 | tcp_openreq_init(req, &tmp_opt, skb); | |
1317 | ||
4237c75c VY |
1318 | if (security_inet_conn_request(sk, skb, req)) |
1319 | goto drop_and_free; | |
1320 | ||
2e6599cb ACM |
1321 | ireq = inet_rsk(req); |
1322 | ireq->loc_addr = daddr; | |
1323 | ireq->rmt_addr = saddr; | |
1324 | ireq->opt = tcp_v4_save_options(sk, skb); | |
1da177e4 | 1325 | if (!want_cookie) |
aa8223c7 | 1326 | TCP_ECN_create_request(req, tcp_hdr(skb)); |
1da177e4 LT |
1327 | |
1328 | if (want_cookie) { | |
1329 | #ifdef CONFIG_SYN_COOKIES | |
1330 | syn_flood_warning(skb); | |
1331 | #endif | |
1332 | isn = cookie_v4_init_sequence(sk, skb, &req->mss); | |
1333 | } else if (!isn) { | |
1334 | struct inet_peer *peer = NULL; | |
1335 | ||
1336 | /* VJ's idea. We save last timestamp seen | |
1337 | * from the destination in peer table, when entering | |
1338 | * state TIME-WAIT, and check against it before | |
1339 | * accepting new connection request. | |
1340 | * | |
1341 | * If "isn" is not zero, this request hit alive | |
1342 | * timewait bucket, so that all the necessary checks | |
1343 | * are made in the function processing timewait state. | |
1344 | */ | |
1345 | if (tmp_opt.saw_tstamp && | |
295ff7ed | 1346 | tcp_death_row.sysctl_tw_recycle && |
463c84b9 | 1347 | (dst = inet_csk_route_req(sk, req)) != NULL && |
1da177e4 LT |
1348 | (peer = rt_get_peer((struct rtable *)dst)) != NULL && |
1349 | peer->v4daddr == saddr) { | |
9d729f72 | 1350 | if (get_seconds() < peer->tcp_ts_stamp + TCP_PAWS_MSL && |
1da177e4 LT |
1351 | (s32)(peer->tcp_ts - req->ts_recent) > |
1352 | TCP_PAWS_WINDOW) { | |
1353 | NET_INC_STATS_BH(LINUX_MIB_PAWSPASSIVEREJECTED); | |
1354 | dst_release(dst); | |
1355 | goto drop_and_free; | |
1356 | } | |
1357 | } | |
1358 | /* Kill the following clause, if you dislike this way. */ | |
1359 | else if (!sysctl_tcp_syncookies && | |
463c84b9 | 1360 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < |
1da177e4 LT |
1361 | (sysctl_max_syn_backlog >> 2)) && |
1362 | (!peer || !peer->tcp_ts_stamp) && | |
1363 | (!dst || !dst_metric(dst, RTAX_RTT))) { | |
1364 | /* Without syncookies last quarter of | |
1365 | * backlog is filled with destinations, | |
1366 | * proven to be alive. | |
1367 | * It means that we continue to communicate | |
1368 | * to destinations, already remembered | |
1369 | * to the moment of synflood. | |
1370 | */ | |
64ce2073 PM |
1371 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open " |
1372 | "request from %u.%u.%u.%u/%u\n", | |
1373 | NIPQUAD(saddr), | |
aa8223c7 | 1374 | ntohs(tcp_hdr(skb)->source)); |
1da177e4 LT |
1375 | dst_release(dst); |
1376 | goto drop_and_free; | |
1377 | } | |
1378 | ||
a94f723d | 1379 | isn = tcp_v4_init_sequence(skb); |
1da177e4 | 1380 | } |
2e6599cb | 1381 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 LT |
1382 | |
1383 | if (tcp_v4_send_synack(sk, req, dst)) | |
1384 | goto drop_and_free; | |
1385 | ||
1386 | if (want_cookie) { | |
e905a9ed | 1387 | reqsk_free(req); |
1da177e4 | 1388 | } else { |
3f421baa | 1389 | inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1da177e4 LT |
1390 | } |
1391 | return 0; | |
1392 | ||
1393 | drop_and_free: | |
60236fdd | 1394 | reqsk_free(req); |
1da177e4 | 1395 | drop: |
1da177e4 LT |
1396 | return 0; |
1397 | } | |
1398 | ||
1399 | ||
1400 | /* | |
1401 | * The three way handshake has completed - we got a valid synack - | |
1402 | * now create the new socket. | |
1403 | */ | |
1404 | struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1405 | struct request_sock *req, |
1da177e4 LT |
1406 | struct dst_entry *dst) |
1407 | { | |
2e6599cb | 1408 | struct inet_request_sock *ireq; |
1da177e4 LT |
1409 | struct inet_sock *newinet; |
1410 | struct tcp_sock *newtp; | |
1411 | struct sock *newsk; | |
cfb6eeb4 YH |
1412 | #ifdef CONFIG_TCP_MD5SIG |
1413 | struct tcp_md5sig_key *key; | |
1414 | #endif | |
1da177e4 LT |
1415 | |
1416 | if (sk_acceptq_is_full(sk)) | |
1417 | goto exit_overflow; | |
1418 | ||
463c84b9 | 1419 | if (!dst && (dst = inet_csk_route_req(sk, req)) == NULL) |
1da177e4 LT |
1420 | goto exit; |
1421 | ||
1422 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1423 | if (!newsk) | |
1424 | goto exit; | |
1425 | ||
bcd76111 | 1426 | newsk->sk_gso_type = SKB_GSO_TCPV4; |
6cbb0df7 | 1427 | sk_setup_caps(newsk, dst); |
1da177e4 LT |
1428 | |
1429 | newtp = tcp_sk(newsk); | |
1430 | newinet = inet_sk(newsk); | |
2e6599cb ACM |
1431 | ireq = inet_rsk(req); |
1432 | newinet->daddr = ireq->rmt_addr; | |
1433 | newinet->rcv_saddr = ireq->loc_addr; | |
1434 | newinet->saddr = ireq->loc_addr; | |
1435 | newinet->opt = ireq->opt; | |
1436 | ireq->opt = NULL; | |
463c84b9 | 1437 | newinet->mc_index = inet_iif(skb); |
eddc9ec5 | 1438 | newinet->mc_ttl = ip_hdr(skb)->ttl; |
d83d8461 | 1439 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1440 | if (newinet->opt) |
d83d8461 | 1441 | inet_csk(newsk)->icsk_ext_hdr_len = newinet->opt->optlen; |
1da177e4 LT |
1442 | newinet->id = newtp->write_seq ^ jiffies; |
1443 | ||
5d424d5a | 1444 | tcp_mtup_init(newsk); |
1da177e4 LT |
1445 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1446 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1447 | tcp_initialize_rcv_mss(newsk); | |
1448 | ||
cfb6eeb4 YH |
1449 | #ifdef CONFIG_TCP_MD5SIG |
1450 | /* Copy over the MD5 key from the original socket */ | |
1451 | if ((key = tcp_v4_md5_do_lookup(sk, newinet->daddr)) != NULL) { | |
1452 | /* | |
1453 | * We're using one, so create a matching key | |
1454 | * on the newsk structure. If we fail to get | |
1455 | * memory, then we end up not copying the key | |
1456 | * across. Shucks. | |
1457 | */ | |
f6685938 ACM |
1458 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1459 | if (newkey != NULL) | |
cfb6eeb4 YH |
1460 | tcp_v4_md5_do_add(newsk, inet_sk(sk)->daddr, |
1461 | newkey, key->keylen); | |
cfb6eeb4 YH |
1462 | } |
1463 | #endif | |
1464 | ||
ab1e0a13 ACM |
1465 | __inet_hash_nolisten(newsk); |
1466 | __inet_inherit_port(sk, newsk); | |
1da177e4 LT |
1467 | |
1468 | return newsk; | |
1469 | ||
1470 | exit_overflow: | |
1471 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
1472 | exit: | |
1473 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
1474 | dst_release(dst); | |
1475 | return NULL; | |
1476 | } | |
1477 | ||
1478 | static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) | |
1479 | { | |
aa8223c7 | 1480 | struct tcphdr *th = tcp_hdr(skb); |
eddc9ec5 | 1481 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 1482 | struct sock *nsk; |
60236fdd | 1483 | struct request_sock **prev; |
1da177e4 | 1484 | /* Find possible connection requests. */ |
463c84b9 ACM |
1485 | struct request_sock *req = inet_csk_search_req(sk, &prev, th->source, |
1486 | iph->saddr, iph->daddr); | |
1da177e4 LT |
1487 | if (req) |
1488 | return tcp_check_req(sk, skb, req, prev); | |
1489 | ||
c67499c0 PE |
1490 | nsk = inet_lookup_established(sk->sk_net, &tcp_hashinfo, iph->saddr, |
1491 | th->source, iph->daddr, th->dest, inet_iif(skb)); | |
1da177e4 LT |
1492 | |
1493 | if (nsk) { | |
1494 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1495 | bh_lock_sock(nsk); | |
1496 | return nsk; | |
1497 | } | |
9469c7b4 | 1498 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1499 | return NULL; |
1500 | } | |
1501 | ||
1502 | #ifdef CONFIG_SYN_COOKIES | |
1503 | if (!th->rst && !th->syn && th->ack) | |
1504 | sk = cookie_v4_check(sk, skb, &(IPCB(skb)->opt)); | |
1505 | #endif | |
1506 | return sk; | |
1507 | } | |
1508 | ||
b51655b9 | 1509 | static __sum16 tcp_v4_checksum_init(struct sk_buff *skb) |
1da177e4 | 1510 | { |
eddc9ec5 ACM |
1511 | const struct iphdr *iph = ip_hdr(skb); |
1512 | ||
84fa7933 | 1513 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
eddc9ec5 ACM |
1514 | if (!tcp_v4_check(skb->len, iph->saddr, |
1515 | iph->daddr, skb->csum)) { | |
fb286bb2 | 1516 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1517 | return 0; |
fb286bb2 | 1518 | } |
1da177e4 | 1519 | } |
fb286bb2 | 1520 | |
eddc9ec5 | 1521 | skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, |
fb286bb2 HX |
1522 | skb->len, IPPROTO_TCP, 0); |
1523 | ||
1da177e4 | 1524 | if (skb->len <= 76) { |
fb286bb2 | 1525 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1526 | } |
1527 | return 0; | |
1528 | } | |
1529 | ||
1530 | ||
1531 | /* The socket must have it's spinlock held when we get | |
1532 | * here. | |
1533 | * | |
1534 | * We have a potential double-lock case here, so even when | |
1535 | * doing backlog processing we use the BH locking scheme. | |
1536 | * This is because we cannot sleep with the original spinlock | |
1537 | * held. | |
1538 | */ | |
1539 | int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1540 | { | |
cfb6eeb4 YH |
1541 | struct sock *rsk; |
1542 | #ifdef CONFIG_TCP_MD5SIG | |
1543 | /* | |
1544 | * We really want to reject the packet as early as possible | |
1545 | * if: | |
1546 | * o We're expecting an MD5'd packet and this is no MD5 tcp option | |
1547 | * o There is an MD5 option and we're not expecting one | |
1548 | */ | |
7174259e | 1549 | if (tcp_v4_inbound_md5_hash(sk, skb)) |
cfb6eeb4 YH |
1550 | goto discard; |
1551 | #endif | |
1552 | ||
1da177e4 LT |
1553 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
1554 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1555 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) { |
cfb6eeb4 | 1556 | rsk = sk; |
1da177e4 | 1557 | goto reset; |
cfb6eeb4 | 1558 | } |
1da177e4 LT |
1559 | TCP_CHECK_TIMER(sk); |
1560 | return 0; | |
1561 | } | |
1562 | ||
ab6a5bb6 | 1563 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1564 | goto csum_err; |
1565 | ||
1566 | if (sk->sk_state == TCP_LISTEN) { | |
1567 | struct sock *nsk = tcp_v4_hnd_req(sk, skb); | |
1568 | if (!nsk) | |
1569 | goto discard; | |
1570 | ||
1571 | if (nsk != sk) { | |
cfb6eeb4 YH |
1572 | if (tcp_child_process(sk, nsk, skb)) { |
1573 | rsk = nsk; | |
1da177e4 | 1574 | goto reset; |
cfb6eeb4 | 1575 | } |
1da177e4 LT |
1576 | return 0; |
1577 | } | |
1578 | } | |
1579 | ||
1580 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1581 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) { |
cfb6eeb4 | 1582 | rsk = sk; |
1da177e4 | 1583 | goto reset; |
cfb6eeb4 | 1584 | } |
1da177e4 LT |
1585 | TCP_CHECK_TIMER(sk); |
1586 | return 0; | |
1587 | ||
1588 | reset: | |
cfb6eeb4 | 1589 | tcp_v4_send_reset(rsk, skb); |
1da177e4 LT |
1590 | discard: |
1591 | kfree_skb(skb); | |
1592 | /* Be careful here. If this function gets more complicated and | |
1593 | * gcc suffers from register pressure on the x86, sk (in %ebx) | |
1594 | * might be destroyed here. This current version compiles correctly, | |
1595 | * but you have been warned. | |
1596 | */ | |
1597 | return 0; | |
1598 | ||
1599 | csum_err: | |
1600 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1601 | goto discard; | |
1602 | } | |
1603 | ||
1604 | /* | |
1605 | * From tcp_input.c | |
1606 | */ | |
1607 | ||
1608 | int tcp_v4_rcv(struct sk_buff *skb) | |
1609 | { | |
eddc9ec5 | 1610 | const struct iphdr *iph; |
1da177e4 LT |
1611 | struct tcphdr *th; |
1612 | struct sock *sk; | |
1613 | int ret; | |
1614 | ||
1615 | if (skb->pkt_type != PACKET_HOST) | |
1616 | goto discard_it; | |
1617 | ||
1618 | /* Count it even if it's bad */ | |
1619 | TCP_INC_STATS_BH(TCP_MIB_INSEGS); | |
1620 | ||
1621 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1622 | goto discard_it; | |
1623 | ||
aa8223c7 | 1624 | th = tcp_hdr(skb); |
1da177e4 LT |
1625 | |
1626 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1627 | goto bad_packet; | |
1628 | if (!pskb_may_pull(skb, th->doff * 4)) | |
1629 | goto discard_it; | |
1630 | ||
1631 | /* An explanation is required here, I think. | |
1632 | * Packet length and doff are validated by header prediction, | |
caa20d9a | 1633 | * provided case of th->doff==0 is eliminated. |
1da177e4 | 1634 | * So, we defer the checks. */ |
60476372 | 1635 | if (!skb_csum_unnecessary(skb) && tcp_v4_checksum_init(skb)) |
1da177e4 LT |
1636 | goto bad_packet; |
1637 | ||
aa8223c7 | 1638 | th = tcp_hdr(skb); |
eddc9ec5 | 1639 | iph = ip_hdr(skb); |
1da177e4 LT |
1640 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1641 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1642 | skb->len - th->doff * 4); | |
1643 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1644 | TCP_SKB_CB(skb)->when = 0; | |
eddc9ec5 | 1645 | TCP_SKB_CB(skb)->flags = iph->tos; |
1da177e4 LT |
1646 | TCP_SKB_CB(skb)->sacked = 0; |
1647 | ||
c67499c0 PE |
1648 | sk = __inet_lookup(skb->dev->nd_net, &tcp_hashinfo, iph->saddr, |
1649 | th->source, iph->daddr, th->dest, inet_iif(skb)); | |
1da177e4 LT |
1650 | if (!sk) |
1651 | goto no_tcp_socket; | |
1652 | ||
1653 | process: | |
1654 | if (sk->sk_state == TCP_TIME_WAIT) | |
1655 | goto do_time_wait; | |
1656 | ||
1657 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1658 | goto discard_and_relse; | |
b59c2701 | 1659 | nf_reset(skb); |
1da177e4 | 1660 | |
fda9ef5d | 1661 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1662 | goto discard_and_relse; |
1663 | ||
1664 | skb->dev = NULL; | |
1665 | ||
c6366184 | 1666 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1667 | ret = 0; |
1668 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 CL |
1669 | #ifdef CONFIG_NET_DMA |
1670 | struct tcp_sock *tp = tcp_sk(sk); | |
1671 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) | |
1672 | tp->ucopy.dma_chan = get_softnet_dma(); | |
1673 | if (tp->ucopy.dma_chan) | |
1da177e4 | 1674 | ret = tcp_v4_do_rcv(sk, skb); |
1a2449a8 CL |
1675 | else |
1676 | #endif | |
1677 | { | |
1678 | if (!tcp_prequeue(sk, skb)) | |
1679 | ret = tcp_v4_do_rcv(sk, skb); | |
1680 | } | |
1da177e4 LT |
1681 | } else |
1682 | sk_add_backlog(sk, skb); | |
1683 | bh_unlock_sock(sk); | |
1684 | ||
1685 | sock_put(sk); | |
1686 | ||
1687 | return ret; | |
1688 | ||
1689 | no_tcp_socket: | |
1690 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1691 | goto discard_it; | |
1692 | ||
1693 | if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { | |
1694 | bad_packet: | |
1695 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1696 | } else { | |
cfb6eeb4 | 1697 | tcp_v4_send_reset(NULL, skb); |
1da177e4 LT |
1698 | } |
1699 | ||
1700 | discard_it: | |
1701 | /* Discard frame. */ | |
1702 | kfree_skb(skb); | |
e905a9ed | 1703 | return 0; |
1da177e4 LT |
1704 | |
1705 | discard_and_relse: | |
1706 | sock_put(sk); | |
1707 | goto discard_it; | |
1708 | ||
1709 | do_time_wait: | |
1710 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1711 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1712 | goto discard_it; |
1713 | } | |
1714 | ||
1715 | if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { | |
1716 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
9469c7b4 | 1717 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1718 | goto discard_it; |
1719 | } | |
9469c7b4 | 1720 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 | 1721 | case TCP_TW_SYN: { |
c67499c0 PE |
1722 | struct sock *sk2 = inet_lookup_listener(skb->dev->nd_net, |
1723 | &tcp_hashinfo, | |
eddc9ec5 | 1724 | iph->daddr, th->dest, |
463c84b9 | 1725 | inet_iif(skb)); |
1da177e4 | 1726 | if (sk2) { |
9469c7b4 YH |
1727 | inet_twsk_deschedule(inet_twsk(sk), &tcp_death_row); |
1728 | inet_twsk_put(inet_twsk(sk)); | |
1da177e4 LT |
1729 | sk = sk2; |
1730 | goto process; | |
1731 | } | |
1732 | /* Fall through to ACK */ | |
1733 | } | |
1734 | case TCP_TW_ACK: | |
1735 | tcp_v4_timewait_ack(sk, skb); | |
1736 | break; | |
1737 | case TCP_TW_RST: | |
1738 | goto no_tcp_socket; | |
1739 | case TCP_TW_SUCCESS:; | |
1740 | } | |
1741 | goto discard_it; | |
1742 | } | |
1743 | ||
1da177e4 LT |
1744 | /* VJ's idea. Save last timestamp seen from this destination |
1745 | * and hold it at least for normal timewait interval to use for duplicate | |
1746 | * segment detection in subsequent connections, before they enter synchronized | |
1747 | * state. | |
1748 | */ | |
1749 | ||
1750 | int tcp_v4_remember_stamp(struct sock *sk) | |
1751 | { | |
1752 | struct inet_sock *inet = inet_sk(sk); | |
1753 | struct tcp_sock *tp = tcp_sk(sk); | |
1754 | struct rtable *rt = (struct rtable *)__sk_dst_get(sk); | |
1755 | struct inet_peer *peer = NULL; | |
1756 | int release_it = 0; | |
1757 | ||
1758 | if (!rt || rt->rt_dst != inet->daddr) { | |
1759 | peer = inet_getpeer(inet->daddr, 1); | |
1760 | release_it = 1; | |
1761 | } else { | |
1762 | if (!rt->peer) | |
1763 | rt_bind_peer(rt, 1); | |
1764 | peer = rt->peer; | |
1765 | } | |
1766 | ||
1767 | if (peer) { | |
1768 | if ((s32)(peer->tcp_ts - tp->rx_opt.ts_recent) <= 0 || | |
9d729f72 | 1769 | (peer->tcp_ts_stamp + TCP_PAWS_MSL < get_seconds() && |
1da177e4 LT |
1770 | peer->tcp_ts_stamp <= tp->rx_opt.ts_recent_stamp)) { |
1771 | peer->tcp_ts_stamp = tp->rx_opt.ts_recent_stamp; | |
1772 | peer->tcp_ts = tp->rx_opt.ts_recent; | |
1773 | } | |
1774 | if (release_it) | |
1775 | inet_putpeer(peer); | |
1776 | return 1; | |
1777 | } | |
1778 | ||
1779 | return 0; | |
1780 | } | |
1781 | ||
8feaf0c0 | 1782 | int tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw) |
1da177e4 | 1783 | { |
8feaf0c0 | 1784 | struct inet_peer *peer = inet_getpeer(tw->tw_daddr, 1); |
1da177e4 LT |
1785 | |
1786 | if (peer) { | |
8feaf0c0 ACM |
1787 | const struct tcp_timewait_sock *tcptw = tcp_twsk((struct sock *)tw); |
1788 | ||
1789 | if ((s32)(peer->tcp_ts - tcptw->tw_ts_recent) <= 0 || | |
9d729f72 | 1790 | (peer->tcp_ts_stamp + TCP_PAWS_MSL < get_seconds() && |
8feaf0c0 ACM |
1791 | peer->tcp_ts_stamp <= tcptw->tw_ts_recent_stamp)) { |
1792 | peer->tcp_ts_stamp = tcptw->tw_ts_recent_stamp; | |
1793 | peer->tcp_ts = tcptw->tw_ts_recent; | |
1da177e4 LT |
1794 | } |
1795 | inet_putpeer(peer); | |
1796 | return 1; | |
1797 | } | |
1798 | ||
1799 | return 0; | |
1800 | } | |
1801 | ||
8292a17a | 1802 | struct inet_connection_sock_af_ops ipv4_specific = { |
543d9cfe ACM |
1803 | .queue_xmit = ip_queue_xmit, |
1804 | .send_check = tcp_v4_send_check, | |
1805 | .rebuild_header = inet_sk_rebuild_header, | |
1806 | .conn_request = tcp_v4_conn_request, | |
1807 | .syn_recv_sock = tcp_v4_syn_recv_sock, | |
1808 | .remember_stamp = tcp_v4_remember_stamp, | |
1809 | .net_header_len = sizeof(struct iphdr), | |
1810 | .setsockopt = ip_setsockopt, | |
1811 | .getsockopt = ip_getsockopt, | |
1812 | .addr2sockaddr = inet_csk_addr2sockaddr, | |
1813 | .sockaddr_len = sizeof(struct sockaddr_in), | |
ab1e0a13 | 1814 | .bind_conflict = inet_csk_bind_conflict, |
3fdadf7d | 1815 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1816 | .compat_setsockopt = compat_ip_setsockopt, |
1817 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 1818 | #endif |
1da177e4 LT |
1819 | }; |
1820 | ||
cfb6eeb4 | 1821 | #ifdef CONFIG_TCP_MD5SIG |
b6332e6c | 1822 | static struct tcp_sock_af_ops tcp_sock_ipv4_specific = { |
cfb6eeb4 YH |
1823 | .md5_lookup = tcp_v4_md5_lookup, |
1824 | .calc_md5_hash = tcp_v4_calc_md5_hash, | |
1825 | .md5_add = tcp_v4_md5_add_func, | |
1826 | .md5_parse = tcp_v4_parse_md5_keys, | |
cfb6eeb4 | 1827 | }; |
b6332e6c | 1828 | #endif |
cfb6eeb4 | 1829 | |
1da177e4 LT |
1830 | /* NOTE: A lot of things set to zero explicitly by call to |
1831 | * sk_alloc() so need not be done here. | |
1832 | */ | |
1833 | static int tcp_v4_init_sock(struct sock *sk) | |
1834 | { | |
6687e988 | 1835 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1836 | struct tcp_sock *tp = tcp_sk(sk); |
1837 | ||
1838 | skb_queue_head_init(&tp->out_of_order_queue); | |
1839 | tcp_init_xmit_timers(sk); | |
1840 | tcp_prequeue_init(tp); | |
1841 | ||
6687e988 | 1842 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1843 | tp->mdev = TCP_TIMEOUT_INIT; |
1844 | ||
1845 | /* So many TCP implementations out there (incorrectly) count the | |
1846 | * initial SYN frame in their delayed-ACK and congestion control | |
1847 | * algorithms that we must have the following bandaid to talk | |
1848 | * efficiently to them. -DaveM | |
1849 | */ | |
1850 | tp->snd_cwnd = 2; | |
1851 | ||
1852 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1853 | * initialization of these values. | |
1854 | */ | |
1855 | tp->snd_ssthresh = 0x7fffffff; /* Infinity */ | |
1856 | tp->snd_cwnd_clamp = ~0; | |
c1b4a7e6 | 1857 | tp->mss_cache = 536; |
1da177e4 LT |
1858 | |
1859 | tp->reordering = sysctl_tcp_reordering; | |
6687e988 | 1860 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
1da177e4 LT |
1861 | |
1862 | sk->sk_state = TCP_CLOSE; | |
1863 | ||
1864 | sk->sk_write_space = sk_stream_write_space; | |
1865 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1866 | ||
8292a17a | 1867 | icsk->icsk_af_ops = &ipv4_specific; |
d83d8461 | 1868 | icsk->icsk_sync_mss = tcp_sync_mss; |
cfb6eeb4 YH |
1869 | #ifdef CONFIG_TCP_MD5SIG |
1870 | tp->af_specific = &tcp_sock_ipv4_specific; | |
1871 | #endif | |
1da177e4 LT |
1872 | |
1873 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; | |
1874 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1875 | ||
1876 | atomic_inc(&tcp_sockets_allocated); | |
1877 | ||
1878 | return 0; | |
1879 | } | |
1880 | ||
1881 | int tcp_v4_destroy_sock(struct sock *sk) | |
1882 | { | |
1883 | struct tcp_sock *tp = tcp_sk(sk); | |
1884 | ||
1885 | tcp_clear_xmit_timers(sk); | |
1886 | ||
6687e988 | 1887 | tcp_cleanup_congestion_control(sk); |
317a76f9 | 1888 | |
1da177e4 | 1889 | /* Cleanup up the write buffer. */ |
fe067e8a | 1890 | tcp_write_queue_purge(sk); |
1da177e4 LT |
1891 | |
1892 | /* Cleans up our, hopefully empty, out_of_order_queue. */ | |
e905a9ed | 1893 | __skb_queue_purge(&tp->out_of_order_queue); |
1da177e4 | 1894 | |
cfb6eeb4 YH |
1895 | #ifdef CONFIG_TCP_MD5SIG |
1896 | /* Clean up the MD5 key list, if any */ | |
1897 | if (tp->md5sig_info) { | |
1898 | tcp_v4_clear_md5_list(sk); | |
1899 | kfree(tp->md5sig_info); | |
1900 | tp->md5sig_info = NULL; | |
1901 | } | |
1902 | #endif | |
1903 | ||
1a2449a8 CL |
1904 | #ifdef CONFIG_NET_DMA |
1905 | /* Cleans up our sk_async_wait_queue */ | |
e905a9ed | 1906 | __skb_queue_purge(&sk->sk_async_wait_queue); |
1a2449a8 CL |
1907 | #endif |
1908 | ||
1da177e4 LT |
1909 | /* Clean prequeue, it must be empty really */ |
1910 | __skb_queue_purge(&tp->ucopy.prequeue); | |
1911 | ||
1912 | /* Clean up a referenced TCP bind bucket. */ | |
463c84b9 | 1913 | if (inet_csk(sk)->icsk_bind_hash) |
ab1e0a13 | 1914 | inet_put_port(sk); |
1da177e4 LT |
1915 | |
1916 | /* | |
1917 | * If sendmsg cached page exists, toss it. | |
1918 | */ | |
1919 | if (sk->sk_sndmsg_page) { | |
1920 | __free_page(sk->sk_sndmsg_page); | |
1921 | sk->sk_sndmsg_page = NULL; | |
1922 | } | |
1923 | ||
1924 | atomic_dec(&tcp_sockets_allocated); | |
1925 | ||
1926 | return 0; | |
1927 | } | |
1928 | ||
1929 | EXPORT_SYMBOL(tcp_v4_destroy_sock); | |
1930 | ||
1931 | #ifdef CONFIG_PROC_FS | |
1932 | /* Proc filesystem TCP sock list dumping. */ | |
1933 | ||
8feaf0c0 | 1934 | static inline struct inet_timewait_sock *tw_head(struct hlist_head *head) |
1da177e4 LT |
1935 | { |
1936 | return hlist_empty(head) ? NULL : | |
8feaf0c0 | 1937 | list_entry(head->first, struct inet_timewait_sock, tw_node); |
1da177e4 LT |
1938 | } |
1939 | ||
8feaf0c0 | 1940 | static inline struct inet_timewait_sock *tw_next(struct inet_timewait_sock *tw) |
1da177e4 LT |
1941 | { |
1942 | return tw->tw_node.next ? | |
1943 | hlist_entry(tw->tw_node.next, typeof(*tw), tw_node) : NULL; | |
1944 | } | |
1945 | ||
1946 | static void *listening_get_next(struct seq_file *seq, void *cur) | |
1947 | { | |
463c84b9 | 1948 | struct inet_connection_sock *icsk; |
1da177e4 LT |
1949 | struct hlist_node *node; |
1950 | struct sock *sk = cur; | |
1951 | struct tcp_iter_state* st = seq->private; | |
1952 | ||
1953 | if (!sk) { | |
1954 | st->bucket = 0; | |
6e04e021 | 1955 | sk = sk_head(&tcp_hashinfo.listening_hash[0]); |
1da177e4 LT |
1956 | goto get_sk; |
1957 | } | |
1958 | ||
1959 | ++st->num; | |
1960 | ||
1961 | if (st->state == TCP_SEQ_STATE_OPENREQ) { | |
60236fdd | 1962 | struct request_sock *req = cur; |
1da177e4 | 1963 | |
72a3effa | 1964 | icsk = inet_csk(st->syn_wait_sk); |
1da177e4 LT |
1965 | req = req->dl_next; |
1966 | while (1) { | |
1967 | while (req) { | |
60236fdd | 1968 | if (req->rsk_ops->family == st->family) { |
1da177e4 LT |
1969 | cur = req; |
1970 | goto out; | |
1971 | } | |
1972 | req = req->dl_next; | |
1973 | } | |
72a3effa | 1974 | if (++st->sbucket >= icsk->icsk_accept_queue.listen_opt->nr_table_entries) |
1da177e4 LT |
1975 | break; |
1976 | get_req: | |
463c84b9 | 1977 | req = icsk->icsk_accept_queue.listen_opt->syn_table[st->sbucket]; |
1da177e4 LT |
1978 | } |
1979 | sk = sk_next(st->syn_wait_sk); | |
1980 | st->state = TCP_SEQ_STATE_LISTENING; | |
463c84b9 | 1981 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 | 1982 | } else { |
e905a9ed | 1983 | icsk = inet_csk(sk); |
463c84b9 ACM |
1984 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1985 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) | |
1da177e4 | 1986 | goto start_req; |
463c84b9 | 1987 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 LT |
1988 | sk = sk_next(sk); |
1989 | } | |
1990 | get_sk: | |
1991 | sk_for_each_from(sk, node) { | |
1992 | if (sk->sk_family == st->family) { | |
1993 | cur = sk; | |
1994 | goto out; | |
1995 | } | |
e905a9ed | 1996 | icsk = inet_csk(sk); |
463c84b9 ACM |
1997 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1998 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) { | |
1da177e4 LT |
1999 | start_req: |
2000 | st->uid = sock_i_uid(sk); | |
2001 | st->syn_wait_sk = sk; | |
2002 | st->state = TCP_SEQ_STATE_OPENREQ; | |
2003 | st->sbucket = 0; | |
2004 | goto get_req; | |
2005 | } | |
463c84b9 | 2006 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 | 2007 | } |
0f7ff927 | 2008 | if (++st->bucket < INET_LHTABLE_SIZE) { |
6e04e021 | 2009 | sk = sk_head(&tcp_hashinfo.listening_hash[st->bucket]); |
1da177e4 LT |
2010 | goto get_sk; |
2011 | } | |
2012 | cur = NULL; | |
2013 | out: | |
2014 | return cur; | |
2015 | } | |
2016 | ||
2017 | static void *listening_get_idx(struct seq_file *seq, loff_t *pos) | |
2018 | { | |
2019 | void *rc = listening_get_next(seq, NULL); | |
2020 | ||
2021 | while (rc && *pos) { | |
2022 | rc = listening_get_next(seq, rc); | |
2023 | --*pos; | |
2024 | } | |
2025 | return rc; | |
2026 | } | |
2027 | ||
2028 | static void *established_get_first(struct seq_file *seq) | |
2029 | { | |
2030 | struct tcp_iter_state* st = seq->private; | |
2031 | void *rc = NULL; | |
2032 | ||
6e04e021 | 2033 | for (st->bucket = 0; st->bucket < tcp_hashinfo.ehash_size; ++st->bucket) { |
1da177e4 LT |
2034 | struct sock *sk; |
2035 | struct hlist_node *node; | |
8feaf0c0 | 2036 | struct inet_timewait_sock *tw; |
230140cf | 2037 | rwlock_t *lock = inet_ehash_lockp(&tcp_hashinfo, st->bucket); |
1da177e4 | 2038 | |
230140cf | 2039 | read_lock_bh(lock); |
6e04e021 | 2040 | sk_for_each(sk, node, &tcp_hashinfo.ehash[st->bucket].chain) { |
1da177e4 LT |
2041 | if (sk->sk_family != st->family) { |
2042 | continue; | |
2043 | } | |
2044 | rc = sk; | |
2045 | goto out; | |
2046 | } | |
2047 | st->state = TCP_SEQ_STATE_TIME_WAIT; | |
8feaf0c0 | 2048 | inet_twsk_for_each(tw, node, |
dbca9b27 | 2049 | &tcp_hashinfo.ehash[st->bucket].twchain) { |
1da177e4 LT |
2050 | if (tw->tw_family != st->family) { |
2051 | continue; | |
2052 | } | |
2053 | rc = tw; | |
2054 | goto out; | |
2055 | } | |
230140cf | 2056 | read_unlock_bh(lock); |
1da177e4 LT |
2057 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
2058 | } | |
2059 | out: | |
2060 | return rc; | |
2061 | } | |
2062 | ||
2063 | static void *established_get_next(struct seq_file *seq, void *cur) | |
2064 | { | |
2065 | struct sock *sk = cur; | |
8feaf0c0 | 2066 | struct inet_timewait_sock *tw; |
1da177e4 LT |
2067 | struct hlist_node *node; |
2068 | struct tcp_iter_state* st = seq->private; | |
2069 | ||
2070 | ++st->num; | |
2071 | ||
2072 | if (st->state == TCP_SEQ_STATE_TIME_WAIT) { | |
2073 | tw = cur; | |
2074 | tw = tw_next(tw); | |
2075 | get_tw: | |
2076 | while (tw && tw->tw_family != st->family) { | |
2077 | tw = tw_next(tw); | |
2078 | } | |
2079 | if (tw) { | |
2080 | cur = tw; | |
2081 | goto out; | |
2082 | } | |
230140cf | 2083 | read_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
1da177e4 LT |
2084 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
2085 | ||
6e04e021 | 2086 | if (++st->bucket < tcp_hashinfo.ehash_size) { |
230140cf | 2087 | read_lock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
6e04e021 | 2088 | sk = sk_head(&tcp_hashinfo.ehash[st->bucket].chain); |
1da177e4 LT |
2089 | } else { |
2090 | cur = NULL; | |
2091 | goto out; | |
2092 | } | |
2093 | } else | |
2094 | sk = sk_next(sk); | |
2095 | ||
2096 | sk_for_each_from(sk, node) { | |
2097 | if (sk->sk_family == st->family) | |
2098 | goto found; | |
2099 | } | |
2100 | ||
2101 | st->state = TCP_SEQ_STATE_TIME_WAIT; | |
dbca9b27 | 2102 | tw = tw_head(&tcp_hashinfo.ehash[st->bucket].twchain); |
1da177e4 LT |
2103 | goto get_tw; |
2104 | found: | |
2105 | cur = sk; | |
2106 | out: | |
2107 | return cur; | |
2108 | } | |
2109 | ||
2110 | static void *established_get_idx(struct seq_file *seq, loff_t pos) | |
2111 | { | |
2112 | void *rc = established_get_first(seq); | |
2113 | ||
2114 | while (rc && pos) { | |
2115 | rc = established_get_next(seq, rc); | |
2116 | --pos; | |
7174259e | 2117 | } |
1da177e4 LT |
2118 | return rc; |
2119 | } | |
2120 | ||
2121 | static void *tcp_get_idx(struct seq_file *seq, loff_t pos) | |
2122 | { | |
2123 | void *rc; | |
2124 | struct tcp_iter_state* st = seq->private; | |
2125 | ||
f3f05f70 | 2126 | inet_listen_lock(&tcp_hashinfo); |
1da177e4 LT |
2127 | st->state = TCP_SEQ_STATE_LISTENING; |
2128 | rc = listening_get_idx(seq, &pos); | |
2129 | ||
2130 | if (!rc) { | |
f3f05f70 | 2131 | inet_listen_unlock(&tcp_hashinfo); |
1da177e4 LT |
2132 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
2133 | rc = established_get_idx(seq, pos); | |
2134 | } | |
2135 | ||
2136 | return rc; | |
2137 | } | |
2138 | ||
2139 | static void *tcp_seq_start(struct seq_file *seq, loff_t *pos) | |
2140 | { | |
2141 | struct tcp_iter_state* st = seq->private; | |
2142 | st->state = TCP_SEQ_STATE_LISTENING; | |
2143 | st->num = 0; | |
2144 | return *pos ? tcp_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
2145 | } | |
2146 | ||
2147 | static void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2148 | { | |
2149 | void *rc = NULL; | |
2150 | struct tcp_iter_state* st; | |
2151 | ||
2152 | if (v == SEQ_START_TOKEN) { | |
2153 | rc = tcp_get_idx(seq, 0); | |
2154 | goto out; | |
2155 | } | |
2156 | st = seq->private; | |
2157 | ||
2158 | switch (st->state) { | |
2159 | case TCP_SEQ_STATE_OPENREQ: | |
2160 | case TCP_SEQ_STATE_LISTENING: | |
2161 | rc = listening_get_next(seq, v); | |
2162 | if (!rc) { | |
f3f05f70 | 2163 | inet_listen_unlock(&tcp_hashinfo); |
1da177e4 LT |
2164 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
2165 | rc = established_get_first(seq); | |
2166 | } | |
2167 | break; | |
2168 | case TCP_SEQ_STATE_ESTABLISHED: | |
2169 | case TCP_SEQ_STATE_TIME_WAIT: | |
2170 | rc = established_get_next(seq, v); | |
2171 | break; | |
2172 | } | |
2173 | out: | |
2174 | ++*pos; | |
2175 | return rc; | |
2176 | } | |
2177 | ||
2178 | static void tcp_seq_stop(struct seq_file *seq, void *v) | |
2179 | { | |
2180 | struct tcp_iter_state* st = seq->private; | |
2181 | ||
2182 | switch (st->state) { | |
2183 | case TCP_SEQ_STATE_OPENREQ: | |
2184 | if (v) { | |
463c84b9 ACM |
2185 | struct inet_connection_sock *icsk = inet_csk(st->syn_wait_sk); |
2186 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); | |
1da177e4 LT |
2187 | } |
2188 | case TCP_SEQ_STATE_LISTENING: | |
2189 | if (v != SEQ_START_TOKEN) | |
f3f05f70 | 2190 | inet_listen_unlock(&tcp_hashinfo); |
1da177e4 LT |
2191 | break; |
2192 | case TCP_SEQ_STATE_TIME_WAIT: | |
2193 | case TCP_SEQ_STATE_ESTABLISHED: | |
2194 | if (v) | |
230140cf | 2195 | read_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
1da177e4 LT |
2196 | break; |
2197 | } | |
2198 | } | |
2199 | ||
2200 | static int tcp_seq_open(struct inode *inode, struct file *file) | |
2201 | { | |
2202 | struct tcp_seq_afinfo *afinfo = PDE(inode)->data; | |
2203 | struct seq_file *seq; | |
2204 | struct tcp_iter_state *s; | |
2205 | int rc; | |
2206 | ||
2207 | if (unlikely(afinfo == NULL)) | |
2208 | return -EINVAL; | |
2209 | ||
0da974f4 | 2210 | s = kzalloc(sizeof(*s), GFP_KERNEL); |
1da177e4 LT |
2211 | if (!s) |
2212 | return -ENOMEM; | |
1da177e4 LT |
2213 | s->family = afinfo->family; |
2214 | s->seq_ops.start = tcp_seq_start; | |
2215 | s->seq_ops.next = tcp_seq_next; | |
2216 | s->seq_ops.show = afinfo->seq_show; | |
2217 | s->seq_ops.stop = tcp_seq_stop; | |
2218 | ||
2219 | rc = seq_open(file, &s->seq_ops); | |
2220 | if (rc) | |
2221 | goto out_kfree; | |
2222 | seq = file->private_data; | |
2223 | seq->private = s; | |
2224 | out: | |
2225 | return rc; | |
2226 | out_kfree: | |
2227 | kfree(s); | |
2228 | goto out; | |
2229 | } | |
2230 | ||
2231 | int tcp_proc_register(struct tcp_seq_afinfo *afinfo) | |
2232 | { | |
2233 | int rc = 0; | |
2234 | struct proc_dir_entry *p; | |
2235 | ||
2236 | if (!afinfo) | |
2237 | return -EINVAL; | |
2238 | afinfo->seq_fops->owner = afinfo->owner; | |
2239 | afinfo->seq_fops->open = tcp_seq_open; | |
2240 | afinfo->seq_fops->read = seq_read; | |
2241 | afinfo->seq_fops->llseek = seq_lseek; | |
2242 | afinfo->seq_fops->release = seq_release_private; | |
7174259e | 2243 | |
457c4cbc | 2244 | p = proc_net_fops_create(&init_net, afinfo->name, S_IRUGO, afinfo->seq_fops); |
1da177e4 LT |
2245 | if (p) |
2246 | p->data = afinfo; | |
2247 | else | |
2248 | rc = -ENOMEM; | |
2249 | return rc; | |
2250 | } | |
2251 | ||
2252 | void tcp_proc_unregister(struct tcp_seq_afinfo *afinfo) | |
2253 | { | |
2254 | if (!afinfo) | |
2255 | return; | |
457c4cbc | 2256 | proc_net_remove(&init_net, afinfo->name); |
7174259e | 2257 | memset(afinfo->seq_fops, 0, sizeof(*afinfo->seq_fops)); |
1da177e4 LT |
2258 | } |
2259 | ||
60236fdd | 2260 | static void get_openreq4(struct sock *sk, struct request_sock *req, |
1da177e4 LT |
2261 | char *tmpbuf, int i, int uid) |
2262 | { | |
2e6599cb | 2263 | const struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 LT |
2264 | int ttd = req->expires - jiffies; |
2265 | ||
2266 | sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X" | |
2267 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %u %d %p", | |
2268 | i, | |
2e6599cb | 2269 | ireq->loc_addr, |
1da177e4 | 2270 | ntohs(inet_sk(sk)->sport), |
2e6599cb ACM |
2271 | ireq->rmt_addr, |
2272 | ntohs(ireq->rmt_port), | |
1da177e4 LT |
2273 | TCP_SYN_RECV, |
2274 | 0, 0, /* could print option size, but that is af dependent. */ | |
2275 | 1, /* timers active (only the expire timer) */ | |
2276 | jiffies_to_clock_t(ttd), | |
2277 | req->retrans, | |
2278 | uid, | |
2279 | 0, /* non standard timer */ | |
2280 | 0, /* open_requests have no inode */ | |
2281 | atomic_read(&sk->sk_refcnt), | |
2282 | req); | |
2283 | } | |
2284 | ||
cf4c6bf8 | 2285 | static void get_tcp4_sock(struct sock *sk, char *tmpbuf, int i) |
1da177e4 LT |
2286 | { |
2287 | int timer_active; | |
2288 | unsigned long timer_expires; | |
cf4c6bf8 IJ |
2289 | struct tcp_sock *tp = tcp_sk(sk); |
2290 | const struct inet_connection_sock *icsk = inet_csk(sk); | |
2291 | struct inet_sock *inet = inet_sk(sk); | |
714e85be AV |
2292 | __be32 dest = inet->daddr; |
2293 | __be32 src = inet->rcv_saddr; | |
1da177e4 LT |
2294 | __u16 destp = ntohs(inet->dport); |
2295 | __u16 srcp = ntohs(inet->sport); | |
2296 | ||
463c84b9 | 2297 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
1da177e4 | 2298 | timer_active = 1; |
463c84b9 ACM |
2299 | timer_expires = icsk->icsk_timeout; |
2300 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 2301 | timer_active = 4; |
463c84b9 | 2302 | timer_expires = icsk->icsk_timeout; |
cf4c6bf8 | 2303 | } else if (timer_pending(&sk->sk_timer)) { |
1da177e4 | 2304 | timer_active = 2; |
cf4c6bf8 | 2305 | timer_expires = sk->sk_timer.expires; |
1da177e4 LT |
2306 | } else { |
2307 | timer_active = 0; | |
2308 | timer_expires = jiffies; | |
2309 | } | |
2310 | ||
2311 | sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X %02X %08X:%08X %02X:%08lX " | |
2312 | "%08X %5d %8d %lu %d %p %u %u %u %u %d", | |
cf4c6bf8 | 2313 | i, src, srcp, dest, destp, sk->sk_state, |
47da8ee6 | 2314 | tp->write_seq - tp->snd_una, |
cf4c6bf8 | 2315 | sk->sk_state == TCP_LISTEN ? sk->sk_ack_backlog : |
7174259e | 2316 | (tp->rcv_nxt - tp->copied_seq), |
1da177e4 LT |
2317 | timer_active, |
2318 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 2319 | icsk->icsk_retransmits, |
cf4c6bf8 | 2320 | sock_i_uid(sk), |
6687e988 | 2321 | icsk->icsk_probes_out, |
cf4c6bf8 IJ |
2322 | sock_i_ino(sk), |
2323 | atomic_read(&sk->sk_refcnt), sk, | |
463c84b9 ACM |
2324 | icsk->icsk_rto, |
2325 | icsk->icsk_ack.ato, | |
2326 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, | |
1da177e4 LT |
2327 | tp->snd_cwnd, |
2328 | tp->snd_ssthresh >= 0xFFFF ? -1 : tp->snd_ssthresh); | |
2329 | } | |
2330 | ||
7174259e ACM |
2331 | static void get_timewait4_sock(struct inet_timewait_sock *tw, |
2332 | char *tmpbuf, int i) | |
1da177e4 | 2333 | { |
23f33c2d | 2334 | __be32 dest, src; |
1da177e4 LT |
2335 | __u16 destp, srcp; |
2336 | int ttd = tw->tw_ttd - jiffies; | |
2337 | ||
2338 | if (ttd < 0) | |
2339 | ttd = 0; | |
2340 | ||
2341 | dest = tw->tw_daddr; | |
2342 | src = tw->tw_rcv_saddr; | |
2343 | destp = ntohs(tw->tw_dport); | |
2344 | srcp = ntohs(tw->tw_sport); | |
2345 | ||
2346 | sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X" | |
2347 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p", | |
2348 | i, src, srcp, dest, destp, tw->tw_substate, 0, 0, | |
2349 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2350 | atomic_read(&tw->tw_refcnt), tw); | |
2351 | } | |
2352 | ||
2353 | #define TMPSZ 150 | |
2354 | ||
2355 | static int tcp4_seq_show(struct seq_file *seq, void *v) | |
2356 | { | |
2357 | struct tcp_iter_state* st; | |
2358 | char tmpbuf[TMPSZ + 1]; | |
2359 | ||
2360 | if (v == SEQ_START_TOKEN) { | |
2361 | seq_printf(seq, "%-*s\n", TMPSZ - 1, | |
2362 | " sl local_address rem_address st tx_queue " | |
2363 | "rx_queue tr tm->when retrnsmt uid timeout " | |
2364 | "inode"); | |
2365 | goto out; | |
2366 | } | |
2367 | st = seq->private; | |
2368 | ||
2369 | switch (st->state) { | |
2370 | case TCP_SEQ_STATE_LISTENING: | |
2371 | case TCP_SEQ_STATE_ESTABLISHED: | |
2372 | get_tcp4_sock(v, tmpbuf, st->num); | |
2373 | break; | |
2374 | case TCP_SEQ_STATE_OPENREQ: | |
2375 | get_openreq4(st->syn_wait_sk, v, tmpbuf, st->num, st->uid); | |
2376 | break; | |
2377 | case TCP_SEQ_STATE_TIME_WAIT: | |
2378 | get_timewait4_sock(v, tmpbuf, st->num); | |
2379 | break; | |
2380 | } | |
2381 | seq_printf(seq, "%-*s\n", TMPSZ - 1, tmpbuf); | |
2382 | out: | |
2383 | return 0; | |
2384 | } | |
2385 | ||
2386 | static struct file_operations tcp4_seq_fops; | |
2387 | static struct tcp_seq_afinfo tcp4_seq_afinfo = { | |
2388 | .owner = THIS_MODULE, | |
2389 | .name = "tcp", | |
2390 | .family = AF_INET, | |
2391 | .seq_show = tcp4_seq_show, | |
2392 | .seq_fops = &tcp4_seq_fops, | |
2393 | }; | |
2394 | ||
2395 | int __init tcp4_proc_init(void) | |
2396 | { | |
2397 | return tcp_proc_register(&tcp4_seq_afinfo); | |
2398 | } | |
2399 | ||
2400 | void tcp4_proc_exit(void) | |
2401 | { | |
2402 | tcp_proc_unregister(&tcp4_seq_afinfo); | |
2403 | } | |
2404 | #endif /* CONFIG_PROC_FS */ | |
2405 | ||
47a31a6f ED |
2406 | DEFINE_PROTO_INUSE(tcp) |
2407 | ||
1da177e4 LT |
2408 | struct proto tcp_prot = { |
2409 | .name = "TCP", | |
2410 | .owner = THIS_MODULE, | |
2411 | .close = tcp_close, | |
2412 | .connect = tcp_v4_connect, | |
2413 | .disconnect = tcp_disconnect, | |
463c84b9 | 2414 | .accept = inet_csk_accept, |
1da177e4 LT |
2415 | .ioctl = tcp_ioctl, |
2416 | .init = tcp_v4_init_sock, | |
2417 | .destroy = tcp_v4_destroy_sock, | |
2418 | .shutdown = tcp_shutdown, | |
2419 | .setsockopt = tcp_setsockopt, | |
2420 | .getsockopt = tcp_getsockopt, | |
1da177e4 LT |
2421 | .recvmsg = tcp_recvmsg, |
2422 | .backlog_rcv = tcp_v4_do_rcv, | |
ab1e0a13 ACM |
2423 | .hash = inet_hash, |
2424 | .unhash = inet_unhash, | |
2425 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2426 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2427 | .sockets_allocated = &tcp_sockets_allocated, | |
0a5578cf | 2428 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2429 | .memory_allocated = &tcp_memory_allocated, |
2430 | .memory_pressure = &tcp_memory_pressure, | |
2431 | .sysctl_mem = sysctl_tcp_mem, | |
2432 | .sysctl_wmem = sysctl_tcp_wmem, | |
2433 | .sysctl_rmem = sysctl_tcp_rmem, | |
2434 | .max_header = MAX_TCP_HEADER, | |
2435 | .obj_size = sizeof(struct tcp_sock), | |
6d6ee43e | 2436 | .twsk_prot = &tcp_timewait_sock_ops, |
60236fdd | 2437 | .rsk_prot = &tcp_request_sock_ops, |
ab1e0a13 | 2438 | .hashinfo = &tcp_hashinfo, |
543d9cfe ACM |
2439 | #ifdef CONFIG_COMPAT |
2440 | .compat_setsockopt = compat_tcp_setsockopt, | |
2441 | .compat_getsockopt = compat_tcp_getsockopt, | |
2442 | #endif | |
47a31a6f | 2443 | REF_PROTO_INUSE(tcp) |
1da177e4 LT |
2444 | }; |
2445 | ||
1da177e4 LT |
2446 | void __init tcp_v4_init(struct net_proto_family *ops) |
2447 | { | |
7174259e ACM |
2448 | if (inet_csk_ctl_sock_create(&tcp_socket, PF_INET, SOCK_RAW, |
2449 | IPPROTO_TCP) < 0) | |
1da177e4 | 2450 | panic("Failed to create the TCP control socket.\n"); |
1da177e4 LT |
2451 | } |
2452 | ||
2453 | EXPORT_SYMBOL(ipv4_specific); | |
1da177e4 | 2454 | EXPORT_SYMBOL(tcp_hashinfo); |
1da177e4 | 2455 | EXPORT_SYMBOL(tcp_prot); |
1da177e4 LT |
2456 | EXPORT_SYMBOL(tcp_v4_conn_request); |
2457 | EXPORT_SYMBOL(tcp_v4_connect); | |
2458 | EXPORT_SYMBOL(tcp_v4_do_rcv); | |
1da177e4 LT |
2459 | EXPORT_SYMBOL(tcp_v4_remember_stamp); |
2460 | EXPORT_SYMBOL(tcp_v4_send_check); | |
2461 | EXPORT_SYMBOL(tcp_v4_syn_recv_sock); | |
2462 | ||
2463 | #ifdef CONFIG_PROC_FS | |
2464 | EXPORT_SYMBOL(tcp_proc_register); | |
2465 | EXPORT_SYMBOL(tcp_proc_unregister); | |
2466 | #endif | |
1da177e4 | 2467 | EXPORT_SYMBOL(sysctl_tcp_low_latency); |
1da177e4 | 2468 |