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 | * | |
1da177e4 LT |
8 | * IPv4 specific functions |
9 | * | |
10 | * | |
11 | * code split from: | |
12 | * linux/ipv4/tcp.c | |
13 | * linux/ipv4/tcp_input.c | |
14 | * linux/ipv4/tcp_output.c | |
15 | * | |
16 | * See tcp.c for author information | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or | |
19 | * modify it under the terms of the GNU General Public License | |
20 | * as published by the Free Software Foundation; either version | |
21 | * 2 of the License, or (at your option) any later version. | |
22 | */ | |
23 | ||
24 | /* | |
25 | * Changes: | |
26 | * David S. Miller : New socket lookup architecture. | |
27 | * This code is dedicated to John Dyson. | |
28 | * David S. Miller : Change semantics of established hash, | |
29 | * half is devoted to TIME_WAIT sockets | |
30 | * and the rest go in the other half. | |
31 | * Andi Kleen : Add support for syncookies and fixed | |
32 | * some bugs: ip options weren't passed to | |
33 | * the TCP layer, missed a check for an | |
34 | * ACK bit. | |
35 | * Andi Kleen : Implemented fast path mtu discovery. | |
36 | * Fixed many serious bugs in the | |
60236fdd | 37 | * request_sock handling and moved |
1da177e4 LT |
38 | * most of it into the af independent code. |
39 | * Added tail drop and some other bugfixes. | |
caa20d9a | 40 | * Added new listen semantics. |
1da177e4 LT |
41 | * Mike McLagan : Routing by source |
42 | * Juan Jose Ciarlante: ip_dynaddr bits | |
43 | * Andi Kleen: various fixes. | |
44 | * Vitaly E. Lavrov : Transparent proxy revived after year | |
45 | * coma. | |
46 | * Andi Kleen : Fix new listen. | |
47 | * Andi Kleen : Fix accept error reporting. | |
48 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
49 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
50 | * a single port at the same time. | |
51 | */ | |
52 | ||
1da177e4 LT |
53 | |
54 | #include <linux/types.h> | |
55 | #include <linux/fcntl.h> | |
56 | #include <linux/module.h> | |
57 | #include <linux/random.h> | |
58 | #include <linux/cache.h> | |
59 | #include <linux/jhash.h> | |
60 | #include <linux/init.h> | |
61 | #include <linux/times.h> | |
62 | ||
457c4cbc | 63 | #include <net/net_namespace.h> |
1da177e4 | 64 | #include <net/icmp.h> |
304a1618 | 65 | #include <net/inet_hashtables.h> |
1da177e4 | 66 | #include <net/tcp.h> |
20380731 | 67 | #include <net/transp_v6.h> |
1da177e4 LT |
68 | #include <net/ipv6.h> |
69 | #include <net/inet_common.h> | |
6d6ee43e | 70 | #include <net/timewait_sock.h> |
1da177e4 | 71 | #include <net/xfrm.h> |
1a2449a8 | 72 | #include <net/netdma.h> |
1da177e4 LT |
73 | |
74 | #include <linux/inet.h> | |
75 | #include <linux/ipv6.h> | |
76 | #include <linux/stddef.h> | |
77 | #include <linux/proc_fs.h> | |
78 | #include <linux/seq_file.h> | |
79 | ||
cfb6eeb4 YH |
80 | #include <linux/crypto.h> |
81 | #include <linux/scatterlist.h> | |
82 | ||
ab32ea5d BH |
83 | int sysctl_tcp_tw_reuse __read_mostly; |
84 | int sysctl_tcp_low_latency __read_mostly; | |
1da177e4 | 85 | |
1da177e4 | 86 | |
cfb6eeb4 | 87 | #ifdef CONFIG_TCP_MD5SIG |
7174259e ACM |
88 | static struct tcp_md5sig_key *tcp_v4_md5_do_lookup(struct sock *sk, |
89 | __be32 addr); | |
49a72dfb AL |
90 | static int tcp_v4_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
91 | __be32 daddr, __be32 saddr, struct tcphdr *th); | |
9501f972 YH |
92 | #else |
93 | static inline | |
94 | struct tcp_md5sig_key *tcp_v4_md5_do_lookup(struct sock *sk, __be32 addr) | |
95 | { | |
96 | return NULL; | |
97 | } | |
cfb6eeb4 YH |
98 | #endif |
99 | ||
5caea4ea | 100 | struct inet_hashinfo tcp_hashinfo; |
1da177e4 | 101 | |
a94f723d | 102 | static inline __u32 tcp_v4_init_sequence(struct sk_buff *skb) |
1da177e4 | 103 | { |
eddc9ec5 ACM |
104 | return secure_tcp_sequence_number(ip_hdr(skb)->daddr, |
105 | ip_hdr(skb)->saddr, | |
aa8223c7 ACM |
106 | tcp_hdr(skb)->dest, |
107 | tcp_hdr(skb)->source); | |
1da177e4 LT |
108 | } |
109 | ||
6d6ee43e ACM |
110 | int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp) |
111 | { | |
112 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sktw); | |
113 | struct tcp_sock *tp = tcp_sk(sk); | |
114 | ||
115 | /* With PAWS, it is safe from the viewpoint | |
116 | of data integrity. Even without PAWS it is safe provided sequence | |
117 | spaces do not overlap i.e. at data rates <= 80Mbit/sec. | |
118 | ||
119 | Actually, the idea is close to VJ's one, only timestamp cache is | |
120 | held not per host, but per port pair and TW bucket is used as state | |
121 | holder. | |
122 | ||
123 | If TW bucket has been already destroyed we fall back to VJ's scheme | |
124 | and use initial timestamp retrieved from peer table. | |
125 | */ | |
126 | if (tcptw->tw_ts_recent_stamp && | |
127 | (twp == NULL || (sysctl_tcp_tw_reuse && | |
9d729f72 | 128 | get_seconds() - tcptw->tw_ts_recent_stamp > 1))) { |
6d6ee43e ACM |
129 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; |
130 | if (tp->write_seq == 0) | |
131 | tp->write_seq = 1; | |
132 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; | |
133 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; | |
134 | sock_hold(sktw); | |
135 | return 1; | |
136 | } | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
141 | EXPORT_SYMBOL_GPL(tcp_twsk_unique); | |
142 | ||
1da177e4 LT |
143 | /* This will initiate an outgoing connection. */ |
144 | int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
145 | { | |
146 | struct inet_sock *inet = inet_sk(sk); | |
147 | struct tcp_sock *tp = tcp_sk(sk); | |
148 | struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; | |
149 | struct rtable *rt; | |
bada8adc | 150 | __be32 daddr, nexthop; |
1da177e4 LT |
151 | int tmp; |
152 | int err; | |
153 | ||
154 | if (addr_len < sizeof(struct sockaddr_in)) | |
155 | return -EINVAL; | |
156 | ||
157 | if (usin->sin_family != AF_INET) | |
158 | return -EAFNOSUPPORT; | |
159 | ||
160 | nexthop = daddr = usin->sin_addr.s_addr; | |
161 | if (inet->opt && inet->opt->srr) { | |
162 | if (!daddr) | |
163 | return -EINVAL; | |
164 | nexthop = inet->opt->faddr; | |
165 | } | |
166 | ||
167 | tmp = ip_route_connect(&rt, nexthop, inet->saddr, | |
168 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, | |
169 | IPPROTO_TCP, | |
8eb9086f | 170 | inet->sport, usin->sin_port, sk, 1); |
584bdf8c WD |
171 | if (tmp < 0) { |
172 | if (tmp == -ENETUNREACH) | |
7c73a6fa | 173 | IP_INC_STATS_BH(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); |
1da177e4 | 174 | return tmp; |
584bdf8c | 175 | } |
1da177e4 LT |
176 | |
177 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { | |
178 | ip_rt_put(rt); | |
179 | return -ENETUNREACH; | |
180 | } | |
181 | ||
182 | if (!inet->opt || !inet->opt->srr) | |
183 | daddr = rt->rt_dst; | |
184 | ||
185 | if (!inet->saddr) | |
186 | inet->saddr = rt->rt_src; | |
187 | inet->rcv_saddr = inet->saddr; | |
188 | ||
189 | if (tp->rx_opt.ts_recent_stamp && inet->daddr != daddr) { | |
190 | /* Reset inherited state */ | |
191 | tp->rx_opt.ts_recent = 0; | |
192 | tp->rx_opt.ts_recent_stamp = 0; | |
193 | tp->write_seq = 0; | |
194 | } | |
195 | ||
295ff7ed | 196 | if (tcp_death_row.sysctl_tw_recycle && |
1da177e4 LT |
197 | !tp->rx_opt.ts_recent_stamp && rt->rt_dst == daddr) { |
198 | struct inet_peer *peer = rt_get_peer(rt); | |
7174259e ACM |
199 | /* |
200 | * VJ's idea. We save last timestamp seen from | |
201 | * the destination in peer table, when entering state | |
202 | * TIME-WAIT * and initialize rx_opt.ts_recent from it, | |
203 | * when trying new connection. | |
1da177e4 | 204 | */ |
7174259e | 205 | if (peer != NULL && |
9d729f72 | 206 | peer->tcp_ts_stamp + TCP_PAWS_MSL >= get_seconds()) { |
1da177e4 LT |
207 | tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp; |
208 | tp->rx_opt.ts_recent = peer->tcp_ts; | |
209 | } | |
210 | } | |
211 | ||
212 | inet->dport = usin->sin_port; | |
213 | inet->daddr = daddr; | |
214 | ||
d83d8461 | 215 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
1da177e4 | 216 | if (inet->opt) |
d83d8461 | 217 | inet_csk(sk)->icsk_ext_hdr_len = inet->opt->optlen; |
1da177e4 LT |
218 | |
219 | tp->rx_opt.mss_clamp = 536; | |
220 | ||
221 | /* Socket identity is still unknown (sport may be zero). | |
222 | * However we set state to SYN-SENT and not releasing socket | |
223 | * lock select source port, enter ourselves into the hash tables and | |
224 | * complete initialization after this. | |
225 | */ | |
226 | tcp_set_state(sk, TCP_SYN_SENT); | |
a7f5e7f1 | 227 | err = inet_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
228 | if (err) |
229 | goto failure; | |
230 | ||
7174259e ACM |
231 | err = ip_route_newports(&rt, IPPROTO_TCP, |
232 | inet->sport, inet->dport, sk); | |
1da177e4 LT |
233 | if (err) |
234 | goto failure; | |
235 | ||
236 | /* OK, now commit destination to socket. */ | |
bcd76111 | 237 | sk->sk_gso_type = SKB_GSO_TCPV4; |
6cbb0df7 | 238 | sk_setup_caps(sk, &rt->u.dst); |
1da177e4 LT |
239 | |
240 | if (!tp->write_seq) | |
241 | tp->write_seq = secure_tcp_sequence_number(inet->saddr, | |
242 | inet->daddr, | |
243 | inet->sport, | |
244 | usin->sin_port); | |
245 | ||
246 | inet->id = tp->write_seq ^ jiffies; | |
247 | ||
248 | err = tcp_connect(sk); | |
249 | rt = NULL; | |
250 | if (err) | |
251 | goto failure; | |
252 | ||
253 | return 0; | |
254 | ||
255 | failure: | |
7174259e ACM |
256 | /* |
257 | * This unhashes the socket and releases the local port, | |
258 | * if necessary. | |
259 | */ | |
1da177e4 LT |
260 | tcp_set_state(sk, TCP_CLOSE); |
261 | ip_rt_put(rt); | |
262 | sk->sk_route_caps = 0; | |
263 | inet->dport = 0; | |
264 | return err; | |
265 | } | |
266 | ||
1da177e4 LT |
267 | /* |
268 | * This routine does path mtu discovery as defined in RFC1191. | |
269 | */ | |
40efc6fa | 270 | static void do_pmtu_discovery(struct sock *sk, struct iphdr *iph, u32 mtu) |
1da177e4 LT |
271 | { |
272 | struct dst_entry *dst; | |
273 | struct inet_sock *inet = inet_sk(sk); | |
1da177e4 LT |
274 | |
275 | /* We are not interested in TCP_LISTEN and open_requests (SYN-ACKs | |
276 | * send out by Linux are always <576bytes so they should go through | |
277 | * unfragmented). | |
278 | */ | |
279 | if (sk->sk_state == TCP_LISTEN) | |
280 | return; | |
281 | ||
282 | /* We don't check in the destentry if pmtu discovery is forbidden | |
283 | * on this route. We just assume that no packet_to_big packets | |
284 | * are send back when pmtu discovery is not active. | |
e905a9ed | 285 | * There is a small race when the user changes this flag in the |
1da177e4 LT |
286 | * route, but I think that's acceptable. |
287 | */ | |
288 | if ((dst = __sk_dst_check(sk, 0)) == NULL) | |
289 | return; | |
290 | ||
291 | dst->ops->update_pmtu(dst, mtu); | |
292 | ||
293 | /* Something is about to be wrong... Remember soft error | |
294 | * for the case, if this connection will not able to recover. | |
295 | */ | |
296 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) | |
297 | sk->sk_err_soft = EMSGSIZE; | |
298 | ||
299 | mtu = dst_mtu(dst); | |
300 | ||
301 | if (inet->pmtudisc != IP_PMTUDISC_DONT && | |
d83d8461 | 302 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
1da177e4 LT |
303 | tcp_sync_mss(sk, mtu); |
304 | ||
305 | /* Resend the TCP packet because it's | |
306 | * clear that the old packet has been | |
307 | * dropped. This is the new "fast" path mtu | |
308 | * discovery. | |
309 | */ | |
310 | tcp_simple_retransmit(sk); | |
311 | } /* else let the usual retransmit timer handle it */ | |
312 | } | |
313 | ||
314 | /* | |
315 | * This routine is called by the ICMP module when it gets some | |
316 | * sort of error condition. If err < 0 then the socket should | |
317 | * be closed and the error returned to the user. If err > 0 | |
318 | * it's just the icmp type << 8 | icmp code. After adjustment | |
319 | * header points to the first 8 bytes of the tcp header. We need | |
320 | * to find the appropriate port. | |
321 | * | |
322 | * The locking strategy used here is very "optimistic". When | |
323 | * someone else accesses the socket the ICMP is just dropped | |
324 | * and for some paths there is no check at all. | |
325 | * A more general error queue to queue errors for later handling | |
326 | * is probably better. | |
327 | * | |
328 | */ | |
329 | ||
330 | void tcp_v4_err(struct sk_buff *skb, u32 info) | |
331 | { | |
332 | struct iphdr *iph = (struct iphdr *)skb->data; | |
333 | struct tcphdr *th = (struct tcphdr *)(skb->data + (iph->ihl << 2)); | |
334 | struct tcp_sock *tp; | |
335 | struct inet_sock *inet; | |
88c7664f ACM |
336 | const int type = icmp_hdr(skb)->type; |
337 | const int code = icmp_hdr(skb)->code; | |
1da177e4 LT |
338 | struct sock *sk; |
339 | __u32 seq; | |
340 | int err; | |
fd54d716 | 341 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
342 | |
343 | if (skb->len < (iph->ihl << 2) + 8) { | |
dcfc23ca | 344 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
1da177e4 LT |
345 | return; |
346 | } | |
347 | ||
fd54d716 | 348 | sk = inet_lookup(net, &tcp_hashinfo, iph->daddr, th->dest, |
c67499c0 | 349 | iph->saddr, th->source, inet_iif(skb)); |
1da177e4 | 350 | if (!sk) { |
dcfc23ca | 351 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
1da177e4 LT |
352 | return; |
353 | } | |
354 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 355 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
356 | return; |
357 | } | |
358 | ||
359 | bh_lock_sock(sk); | |
360 | /* If too many ICMPs get dropped on busy | |
361 | * servers this needs to be solved differently. | |
362 | */ | |
363 | if (sock_owned_by_user(sk)) | |
de0744af | 364 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
365 | |
366 | if (sk->sk_state == TCP_CLOSE) | |
367 | goto out; | |
368 | ||
369 | tp = tcp_sk(sk); | |
370 | seq = ntohl(th->seq); | |
371 | if (sk->sk_state != TCP_LISTEN && | |
372 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
de0744af | 373 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
374 | goto out; |
375 | } | |
376 | ||
377 | switch (type) { | |
378 | case ICMP_SOURCE_QUENCH: | |
379 | /* Just silently ignore these. */ | |
380 | goto out; | |
381 | case ICMP_PARAMETERPROB: | |
382 | err = EPROTO; | |
383 | break; | |
384 | case ICMP_DEST_UNREACH: | |
385 | if (code > NR_ICMP_UNREACH) | |
386 | goto out; | |
387 | ||
388 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ | |
389 | if (!sock_owned_by_user(sk)) | |
390 | do_pmtu_discovery(sk, iph, info); | |
391 | goto out; | |
392 | } | |
393 | ||
394 | err = icmp_err_convert[code].errno; | |
395 | break; | |
396 | case ICMP_TIME_EXCEEDED: | |
397 | err = EHOSTUNREACH; | |
398 | break; | |
399 | default: | |
400 | goto out; | |
401 | } | |
402 | ||
403 | switch (sk->sk_state) { | |
60236fdd | 404 | struct request_sock *req, **prev; |
1da177e4 LT |
405 | case TCP_LISTEN: |
406 | if (sock_owned_by_user(sk)) | |
407 | goto out; | |
408 | ||
463c84b9 ACM |
409 | req = inet_csk_search_req(sk, &prev, th->dest, |
410 | iph->daddr, iph->saddr); | |
1da177e4 LT |
411 | if (!req) |
412 | goto out; | |
413 | ||
414 | /* ICMPs are not backlogged, hence we cannot get | |
415 | an established socket here. | |
416 | */ | |
547b792c | 417 | WARN_ON(req->sk); |
1da177e4 | 418 | |
2e6599cb | 419 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 420 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
421 | goto out; |
422 | } | |
423 | ||
424 | /* | |
425 | * Still in SYN_RECV, just remove it silently. | |
426 | * There is no good way to pass the error to the newly | |
427 | * created socket, and POSIX does not want network | |
428 | * errors returned from accept(). | |
429 | */ | |
463c84b9 | 430 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
431 | goto out; |
432 | ||
433 | case TCP_SYN_SENT: | |
434 | case TCP_SYN_RECV: /* Cannot happen. | |
435 | It can f.e. if SYNs crossed. | |
436 | */ | |
437 | if (!sock_owned_by_user(sk)) { | |
1da177e4 LT |
438 | sk->sk_err = err; |
439 | ||
440 | sk->sk_error_report(sk); | |
441 | ||
442 | tcp_done(sk); | |
443 | } else { | |
444 | sk->sk_err_soft = err; | |
445 | } | |
446 | goto out; | |
447 | } | |
448 | ||
449 | /* If we've already connected we will keep trying | |
450 | * until we time out, or the user gives up. | |
451 | * | |
452 | * rfc1122 4.2.3.9 allows to consider as hard errors | |
453 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, | |
454 | * but it is obsoleted by pmtu discovery). | |
455 | * | |
456 | * Note, that in modern internet, where routing is unreliable | |
457 | * and in each dark corner broken firewalls sit, sending random | |
458 | * errors ordered by their masters even this two messages finally lose | |
459 | * their original sense (even Linux sends invalid PORT_UNREACHs) | |
460 | * | |
461 | * Now we are in compliance with RFCs. | |
462 | * --ANK (980905) | |
463 | */ | |
464 | ||
465 | inet = inet_sk(sk); | |
466 | if (!sock_owned_by_user(sk) && inet->recverr) { | |
467 | sk->sk_err = err; | |
468 | sk->sk_error_report(sk); | |
469 | } else { /* Only an error on timeout */ | |
470 | sk->sk_err_soft = err; | |
471 | } | |
472 | ||
473 | out: | |
474 | bh_unlock_sock(sk); | |
475 | sock_put(sk); | |
476 | } | |
477 | ||
478 | /* This routine computes an IPv4 TCP checksum. */ | |
8292a17a | 479 | void tcp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb) |
1da177e4 LT |
480 | { |
481 | struct inet_sock *inet = inet_sk(sk); | |
aa8223c7 | 482 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 483 | |
84fa7933 | 484 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
ba7808ea FD |
485 | th->check = ~tcp_v4_check(len, inet->saddr, |
486 | inet->daddr, 0); | |
663ead3b | 487 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 488 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 489 | } else { |
ba7808ea | 490 | th->check = tcp_v4_check(len, inet->saddr, inet->daddr, |
07f0757a | 491 | csum_partial(th, |
1da177e4 LT |
492 | th->doff << 2, |
493 | skb->csum)); | |
494 | } | |
495 | } | |
496 | ||
a430a43d HX |
497 | int tcp_v4_gso_send_check(struct sk_buff *skb) |
498 | { | |
eddc9ec5 | 499 | const struct iphdr *iph; |
a430a43d HX |
500 | struct tcphdr *th; |
501 | ||
502 | if (!pskb_may_pull(skb, sizeof(*th))) | |
503 | return -EINVAL; | |
504 | ||
eddc9ec5 | 505 | iph = ip_hdr(skb); |
aa8223c7 | 506 | th = tcp_hdr(skb); |
a430a43d HX |
507 | |
508 | th->check = 0; | |
ba7808ea | 509 | th->check = ~tcp_v4_check(skb->len, iph->saddr, iph->daddr, 0); |
663ead3b | 510 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 511 | skb->csum_offset = offsetof(struct tcphdr, check); |
84fa7933 | 512 | skb->ip_summed = CHECKSUM_PARTIAL; |
a430a43d HX |
513 | return 0; |
514 | } | |
515 | ||
1da177e4 LT |
516 | /* |
517 | * This routine will send an RST to the other tcp. | |
518 | * | |
519 | * Someone asks: why I NEVER use socket parameters (TOS, TTL etc.) | |
520 | * for reset. | |
521 | * Answer: if a packet caused RST, it is not for a socket | |
522 | * existing in our system, if it is matched to a socket, | |
523 | * it is just duplicate segment or bug in other side's TCP. | |
524 | * So that we build reply only basing on parameters | |
525 | * arrived with segment. | |
526 | * Exception: precedence violation. We do not implement it in any case. | |
527 | */ | |
528 | ||
cfb6eeb4 | 529 | static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 530 | { |
aa8223c7 | 531 | struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
532 | struct { |
533 | struct tcphdr th; | |
534 | #ifdef CONFIG_TCP_MD5SIG | |
714e85be | 535 | __be32 opt[(TCPOLEN_MD5SIG_ALIGNED >> 2)]; |
cfb6eeb4 YH |
536 | #endif |
537 | } rep; | |
1da177e4 | 538 | struct ip_reply_arg arg; |
cfb6eeb4 YH |
539 | #ifdef CONFIG_TCP_MD5SIG |
540 | struct tcp_md5sig_key *key; | |
541 | #endif | |
a86b1e30 | 542 | struct net *net; |
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 | ||
49a72dfb | 581 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[1], |
78e645cb IJ |
582 | key, ip_hdr(skb)->saddr, |
583 | ip_hdr(skb)->daddr, &rep.th); | |
cfb6eeb4 YH |
584 | } |
585 | #endif | |
eddc9ec5 ACM |
586 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
587 | ip_hdr(skb)->saddr, /* XXX */ | |
52cd5750 | 588 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
1da177e4 | 589 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; |
88ef4a5a | 590 | arg.flags = (sk && inet_sk(sk)->transparent) ? IP_REPLY_ARG_NOSRCCHECK : 0; |
1da177e4 | 591 | |
a86b1e30 PE |
592 | net = dev_net(skb->dst->dev); |
593 | ip_send_reply(net->ipv4.tcp_sock, skb, | |
7feb49c8 | 594 | &arg, arg.iov[0].iov_len); |
1da177e4 | 595 | |
63231bdd PE |
596 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
597 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
1da177e4 LT |
598 | } |
599 | ||
600 | /* The code following below sending ACKs in SYN-RECV and TIME-WAIT states | |
601 | outside socket context is ugly, certainly. What can I do? | |
602 | */ | |
603 | ||
9501f972 YH |
604 | static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack, |
605 | u32 win, u32 ts, int oif, | |
88ef4a5a KK |
606 | struct tcp_md5sig_key *key, |
607 | int reply_flags) | |
1da177e4 | 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; | |
4dd7972d | 619 | struct net *net = dev_net(skb->dst->dev); |
1da177e4 LT |
620 | |
621 | memset(&rep.th, 0, sizeof(struct tcphdr)); | |
7174259e | 622 | memset(&arg, 0, sizeof(arg)); |
1da177e4 LT |
623 | |
624 | arg.iov[0].iov_base = (unsigned char *)&rep; | |
625 | arg.iov[0].iov_len = sizeof(rep.th); | |
626 | if (ts) { | |
cfb6eeb4 YH |
627 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
628 | (TCPOPT_TIMESTAMP << 8) | | |
629 | TCPOLEN_TIMESTAMP); | |
630 | rep.opt[1] = htonl(tcp_time_stamp); | |
631 | rep.opt[2] = htonl(ts); | |
cb48cfe8 | 632 | arg.iov[0].iov_len += TCPOLEN_TSTAMP_ALIGNED; |
1da177e4 LT |
633 | } |
634 | ||
635 | /* Swap the send and the receive. */ | |
636 | rep.th.dest = th->source; | |
637 | rep.th.source = th->dest; | |
638 | rep.th.doff = arg.iov[0].iov_len / 4; | |
639 | rep.th.seq = htonl(seq); | |
640 | rep.th.ack_seq = htonl(ack); | |
641 | rep.th.ack = 1; | |
642 | rep.th.window = htons(win); | |
643 | ||
cfb6eeb4 | 644 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
645 | if (key) { |
646 | int offset = (ts) ? 3 : 0; | |
647 | ||
648 | rep.opt[offset++] = htonl((TCPOPT_NOP << 24) | | |
649 | (TCPOPT_NOP << 16) | | |
650 | (TCPOPT_MD5SIG << 8) | | |
651 | TCPOLEN_MD5SIG); | |
652 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; | |
653 | rep.th.doff = arg.iov[0].iov_len/4; | |
654 | ||
49a72dfb | 655 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[offset], |
90b7e112 AL |
656 | key, ip_hdr(skb)->saddr, |
657 | ip_hdr(skb)->daddr, &rep.th); | |
cfb6eeb4 YH |
658 | } |
659 | #endif | |
88ef4a5a | 660 | arg.flags = reply_flags; |
eddc9ec5 ACM |
661 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
662 | ip_hdr(skb)->saddr, /* XXX */ | |
1da177e4 LT |
663 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
664 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; | |
9501f972 YH |
665 | if (oif) |
666 | arg.bound_dev_if = oif; | |
1da177e4 | 667 | |
a86b1e30 | 668 | ip_send_reply(net->ipv4.tcp_sock, skb, |
7feb49c8 | 669 | &arg, arg.iov[0].iov_len); |
1da177e4 | 670 | |
63231bdd | 671 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
1da177e4 LT |
672 | } |
673 | ||
674 | static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
675 | { | |
8feaf0c0 | 676 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 677 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 678 | |
9501f972 | 679 | tcp_v4_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
7174259e | 680 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
9501f972 YH |
681 | tcptw->tw_ts_recent, |
682 | tw->tw_bound_dev_if, | |
88ef4a5a KK |
683 | tcp_twsk_md5_key(tcptw), |
684 | tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0 | |
9501f972 | 685 | ); |
1da177e4 | 686 | |
8feaf0c0 | 687 | inet_twsk_put(tw); |
1da177e4 LT |
688 | } |
689 | ||
6edafaaf | 690 | static void tcp_v4_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
7174259e | 691 | struct request_sock *req) |
1da177e4 | 692 | { |
9501f972 | 693 | tcp_v4_send_ack(skb, tcp_rsk(req)->snt_isn + 1, |
cfb6eeb4 | 694 | tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, |
9501f972 YH |
695 | req->ts_recent, |
696 | 0, | |
88ef4a5a KK |
697 | tcp_v4_md5_do_lookup(sk, ip_hdr(skb)->daddr), |
698 | inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0); | |
1da177e4 LT |
699 | } |
700 | ||
1da177e4 | 701 | /* |
9bf1d83e | 702 | * Send a SYN-ACK after having received a SYN. |
60236fdd | 703 | * This still operates on a request_sock only, not on a big |
1da177e4 LT |
704 | * socket. |
705 | */ | |
fd80eb94 DL |
706 | static int __tcp_v4_send_synack(struct sock *sk, struct request_sock *req, |
707 | struct dst_entry *dst) | |
1da177e4 | 708 | { |
2e6599cb | 709 | const struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 LT |
710 | int err = -1; |
711 | struct sk_buff * skb; | |
712 | ||
713 | /* First, grab a route. */ | |
463c84b9 | 714 | if (!dst && (dst = inet_csk_route_req(sk, req)) == NULL) |
fd80eb94 | 715 | return -1; |
1da177e4 LT |
716 | |
717 | skb = tcp_make_synack(sk, dst, req); | |
718 | ||
719 | if (skb) { | |
aa8223c7 | 720 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 721 | |
ba7808ea | 722 | th->check = tcp_v4_check(skb->len, |
2e6599cb ACM |
723 | ireq->loc_addr, |
724 | ireq->rmt_addr, | |
07f0757a | 725 | csum_partial(th, skb->len, |
1da177e4 LT |
726 | skb->csum)); |
727 | ||
2e6599cb ACM |
728 | err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, |
729 | ireq->rmt_addr, | |
730 | ireq->opt); | |
b9df3cb8 | 731 | err = net_xmit_eval(err); |
1da177e4 LT |
732 | } |
733 | ||
1da177e4 LT |
734 | dst_release(dst); |
735 | return err; | |
736 | } | |
737 | ||
fd80eb94 DL |
738 | static int tcp_v4_send_synack(struct sock *sk, struct request_sock *req) |
739 | { | |
740 | return __tcp_v4_send_synack(sk, req, NULL); | |
741 | } | |
742 | ||
1da177e4 | 743 | /* |
60236fdd | 744 | * IPv4 request_sock destructor. |
1da177e4 | 745 | */ |
60236fdd | 746 | static void tcp_v4_reqsk_destructor(struct request_sock *req) |
1da177e4 | 747 | { |
a51482bd | 748 | kfree(inet_rsk(req)->opt); |
1da177e4 LT |
749 | } |
750 | ||
80e40daa | 751 | #ifdef CONFIG_SYN_COOKIES |
40efc6fa | 752 | static void syn_flood_warning(struct sk_buff *skb) |
1da177e4 LT |
753 | { |
754 | static unsigned long warntime; | |
755 | ||
756 | if (time_after(jiffies, (warntime + HZ * 60))) { | |
757 | warntime = jiffies; | |
758 | printk(KERN_INFO | |
759 | "possible SYN flooding on port %d. Sending cookies.\n", | |
aa8223c7 | 760 | ntohs(tcp_hdr(skb)->dest)); |
1da177e4 LT |
761 | } |
762 | } | |
80e40daa | 763 | #endif |
1da177e4 LT |
764 | |
765 | /* | |
60236fdd | 766 | * Save and compile IPv4 options into the request_sock if needed. |
1da177e4 | 767 | */ |
40efc6fa SH |
768 | static struct ip_options *tcp_v4_save_options(struct sock *sk, |
769 | struct sk_buff *skb) | |
1da177e4 LT |
770 | { |
771 | struct ip_options *opt = &(IPCB(skb)->opt); | |
772 | struct ip_options *dopt = NULL; | |
773 | ||
774 | if (opt && opt->optlen) { | |
775 | int opt_size = optlength(opt); | |
776 | dopt = kmalloc(opt_size, GFP_ATOMIC); | |
777 | if (dopt) { | |
778 | if (ip_options_echo(dopt, skb)) { | |
779 | kfree(dopt); | |
780 | dopt = NULL; | |
781 | } | |
782 | } | |
783 | } | |
784 | return dopt; | |
785 | } | |
786 | ||
cfb6eeb4 YH |
787 | #ifdef CONFIG_TCP_MD5SIG |
788 | /* | |
789 | * RFC2385 MD5 checksumming requires a mapping of | |
790 | * IP address->MD5 Key. | |
791 | * We need to maintain these in the sk structure. | |
792 | */ | |
793 | ||
794 | /* Find the Key structure for an address. */ | |
7174259e ACM |
795 | static struct tcp_md5sig_key * |
796 | tcp_v4_md5_do_lookup(struct sock *sk, __be32 addr) | |
cfb6eeb4 YH |
797 | { |
798 | struct tcp_sock *tp = tcp_sk(sk); | |
799 | int i; | |
800 | ||
801 | if (!tp->md5sig_info || !tp->md5sig_info->entries4) | |
802 | return NULL; | |
803 | for (i = 0; i < tp->md5sig_info->entries4; i++) { | |
804 | if (tp->md5sig_info->keys4[i].addr == addr) | |
f8ab18d2 | 805 | return &tp->md5sig_info->keys4[i].base; |
cfb6eeb4 YH |
806 | } |
807 | return NULL; | |
808 | } | |
809 | ||
810 | struct tcp_md5sig_key *tcp_v4_md5_lookup(struct sock *sk, | |
811 | struct sock *addr_sk) | |
812 | { | |
813 | return tcp_v4_md5_do_lookup(sk, inet_sk(addr_sk)->daddr); | |
814 | } | |
815 | ||
816 | EXPORT_SYMBOL(tcp_v4_md5_lookup); | |
817 | ||
f5b99bcd AB |
818 | static struct tcp_md5sig_key *tcp_v4_reqsk_md5_lookup(struct sock *sk, |
819 | struct request_sock *req) | |
cfb6eeb4 YH |
820 | { |
821 | return tcp_v4_md5_do_lookup(sk, inet_rsk(req)->rmt_addr); | |
822 | } | |
823 | ||
824 | /* This can be called on a newly created socket, from other files */ | |
825 | int tcp_v4_md5_do_add(struct sock *sk, __be32 addr, | |
826 | u8 *newkey, u8 newkeylen) | |
827 | { | |
828 | /* Add Key to the list */ | |
b0a713e9 | 829 | struct tcp_md5sig_key *key; |
cfb6eeb4 YH |
830 | struct tcp_sock *tp = tcp_sk(sk); |
831 | struct tcp4_md5sig_key *keys; | |
832 | ||
b0a713e9 | 833 | key = tcp_v4_md5_do_lookup(sk, addr); |
cfb6eeb4 YH |
834 | if (key) { |
835 | /* Pre-existing entry - just update that one. */ | |
b0a713e9 MD |
836 | kfree(key->key); |
837 | key->key = newkey; | |
838 | key->keylen = newkeylen; | |
cfb6eeb4 | 839 | } else { |
f6685938 ACM |
840 | struct tcp_md5sig_info *md5sig; |
841 | ||
cfb6eeb4 | 842 | if (!tp->md5sig_info) { |
f6685938 ACM |
843 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), |
844 | GFP_ATOMIC); | |
cfb6eeb4 YH |
845 | if (!tp->md5sig_info) { |
846 | kfree(newkey); | |
847 | return -ENOMEM; | |
848 | } | |
3d7dbeac | 849 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 YH |
850 | } |
851 | if (tcp_alloc_md5sig_pool() == NULL) { | |
852 | kfree(newkey); | |
853 | return -ENOMEM; | |
854 | } | |
f6685938 ACM |
855 | md5sig = tp->md5sig_info; |
856 | ||
857 | if (md5sig->alloced4 == md5sig->entries4) { | |
858 | keys = kmalloc((sizeof(*keys) * | |
e905a9ed | 859 | (md5sig->entries4 + 1)), GFP_ATOMIC); |
cfb6eeb4 YH |
860 | if (!keys) { |
861 | kfree(newkey); | |
862 | tcp_free_md5sig_pool(); | |
863 | return -ENOMEM; | |
864 | } | |
865 | ||
f6685938 ACM |
866 | if (md5sig->entries4) |
867 | memcpy(keys, md5sig->keys4, | |
868 | sizeof(*keys) * md5sig->entries4); | |
cfb6eeb4 YH |
869 | |
870 | /* Free old key list, and reference new one */ | |
a80cc20d | 871 | kfree(md5sig->keys4); |
f6685938 ACM |
872 | md5sig->keys4 = keys; |
873 | md5sig->alloced4++; | |
cfb6eeb4 | 874 | } |
f6685938 | 875 | md5sig->entries4++; |
f8ab18d2 DM |
876 | md5sig->keys4[md5sig->entries4 - 1].addr = addr; |
877 | md5sig->keys4[md5sig->entries4 - 1].base.key = newkey; | |
878 | md5sig->keys4[md5sig->entries4 - 1].base.keylen = newkeylen; | |
cfb6eeb4 YH |
879 | } |
880 | return 0; | |
881 | } | |
882 | ||
883 | EXPORT_SYMBOL(tcp_v4_md5_do_add); | |
884 | ||
885 | static int tcp_v4_md5_add_func(struct sock *sk, struct sock *addr_sk, | |
886 | u8 *newkey, u8 newkeylen) | |
887 | { | |
888 | return tcp_v4_md5_do_add(sk, inet_sk(addr_sk)->daddr, | |
889 | newkey, newkeylen); | |
890 | } | |
891 | ||
892 | int tcp_v4_md5_do_del(struct sock *sk, __be32 addr) | |
893 | { | |
894 | struct tcp_sock *tp = tcp_sk(sk); | |
895 | int i; | |
896 | ||
897 | for (i = 0; i < tp->md5sig_info->entries4; i++) { | |
898 | if (tp->md5sig_info->keys4[i].addr == addr) { | |
899 | /* Free the key */ | |
f8ab18d2 | 900 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
901 | tp->md5sig_info->entries4--; |
902 | ||
903 | if (tp->md5sig_info->entries4 == 0) { | |
904 | kfree(tp->md5sig_info->keys4); | |
905 | tp->md5sig_info->keys4 = NULL; | |
8228a18d | 906 | tp->md5sig_info->alloced4 = 0; |
7174259e | 907 | } else if (tp->md5sig_info->entries4 != i) { |
cfb6eeb4 | 908 | /* Need to do some manipulation */ |
354faf09 YH |
909 | memmove(&tp->md5sig_info->keys4[i], |
910 | &tp->md5sig_info->keys4[i+1], | |
911 | (tp->md5sig_info->entries4 - i) * | |
912 | sizeof(struct tcp4_md5sig_key)); | |
cfb6eeb4 YH |
913 | } |
914 | tcp_free_md5sig_pool(); | |
915 | return 0; | |
916 | } | |
917 | } | |
918 | return -ENOENT; | |
919 | } | |
920 | ||
921 | EXPORT_SYMBOL(tcp_v4_md5_do_del); | |
922 | ||
7174259e | 923 | static void tcp_v4_clear_md5_list(struct sock *sk) |
cfb6eeb4 YH |
924 | { |
925 | struct tcp_sock *tp = tcp_sk(sk); | |
926 | ||
927 | /* Free each key, then the set of key keys, | |
928 | * the crypto element, and then decrement our | |
929 | * hold on the last resort crypto. | |
930 | */ | |
931 | if (tp->md5sig_info->entries4) { | |
932 | int i; | |
933 | for (i = 0; i < tp->md5sig_info->entries4; i++) | |
f8ab18d2 | 934 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
935 | tp->md5sig_info->entries4 = 0; |
936 | tcp_free_md5sig_pool(); | |
937 | } | |
938 | if (tp->md5sig_info->keys4) { | |
939 | kfree(tp->md5sig_info->keys4); | |
940 | tp->md5sig_info->keys4 = NULL; | |
941 | tp->md5sig_info->alloced4 = 0; | |
942 | } | |
943 | } | |
944 | ||
7174259e ACM |
945 | static int tcp_v4_parse_md5_keys(struct sock *sk, char __user *optval, |
946 | int optlen) | |
cfb6eeb4 YH |
947 | { |
948 | struct tcp_md5sig cmd; | |
949 | struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr; | |
950 | u8 *newkey; | |
951 | ||
952 | if (optlen < sizeof(cmd)) | |
953 | return -EINVAL; | |
954 | ||
7174259e | 955 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
cfb6eeb4 YH |
956 | return -EFAULT; |
957 | ||
958 | if (sin->sin_family != AF_INET) | |
959 | return -EINVAL; | |
960 | ||
961 | if (!cmd.tcpm_key || !cmd.tcpm_keylen) { | |
962 | if (!tcp_sk(sk)->md5sig_info) | |
963 | return -ENOENT; | |
964 | return tcp_v4_md5_do_del(sk, sin->sin_addr.s_addr); | |
965 | } | |
966 | ||
967 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
968 | return -EINVAL; | |
969 | ||
970 | if (!tcp_sk(sk)->md5sig_info) { | |
971 | struct tcp_sock *tp = tcp_sk(sk); | |
7174259e | 972 | struct tcp_md5sig_info *p = kzalloc(sizeof(*p), GFP_KERNEL); |
cfb6eeb4 | 973 | |
cfb6eeb4 YH |
974 | if (!p) |
975 | return -EINVAL; | |
976 | ||
977 | tp->md5sig_info = p; | |
3d7dbeac | 978 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 YH |
979 | } |
980 | ||
f6685938 | 981 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
982 | if (!newkey) |
983 | return -ENOMEM; | |
cfb6eeb4 YH |
984 | return tcp_v4_md5_do_add(sk, sin->sin_addr.s_addr, |
985 | newkey, cmd.tcpm_keylen); | |
986 | } | |
987 | ||
49a72dfb AL |
988 | static int tcp_v4_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
989 | __be32 daddr, __be32 saddr, int nbytes) | |
cfb6eeb4 | 990 | { |
cfb6eeb4 | 991 | struct tcp4_pseudohdr *bp; |
49a72dfb | 992 | struct scatterlist sg; |
cfb6eeb4 YH |
993 | |
994 | bp = &hp->md5_blk.ip4; | |
cfb6eeb4 YH |
995 | |
996 | /* | |
49a72dfb | 997 | * 1. the TCP pseudo-header (in the order: source IP address, |
cfb6eeb4 YH |
998 | * destination IP address, zero-padded protocol number, and |
999 | * segment length) | |
1000 | */ | |
1001 | bp->saddr = saddr; | |
1002 | bp->daddr = daddr; | |
1003 | bp->pad = 0; | |
076fb722 | 1004 | bp->protocol = IPPROTO_TCP; |
49a72dfb | 1005 | bp->len = cpu_to_be16(nbytes); |
c7da57a1 | 1006 | |
49a72dfb AL |
1007 | sg_init_one(&sg, bp, sizeof(*bp)); |
1008 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
1009 | } | |
1010 | ||
1011 | static int tcp_v4_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, | |
1012 | __be32 daddr, __be32 saddr, struct tcphdr *th) | |
1013 | { | |
1014 | struct tcp_md5sig_pool *hp; | |
1015 | struct hash_desc *desc; | |
1016 | ||
1017 | hp = tcp_get_md5sig_pool(); | |
1018 | if (!hp) | |
1019 | goto clear_hash_noput; | |
1020 | desc = &hp->md5_desc; | |
1021 | ||
1022 | if (crypto_hash_init(desc)) | |
1023 | goto clear_hash; | |
1024 | if (tcp_v4_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
1025 | goto clear_hash; | |
1026 | if (tcp_md5_hash_header(hp, th)) | |
1027 | goto clear_hash; | |
1028 | if (tcp_md5_hash_key(hp, key)) | |
1029 | goto clear_hash; | |
1030 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 YH |
1031 | goto clear_hash; |
1032 | ||
cfb6eeb4 | 1033 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 1034 | return 0; |
49a72dfb | 1035 | |
cfb6eeb4 YH |
1036 | clear_hash: |
1037 | tcp_put_md5sig_pool(); | |
1038 | clear_hash_noput: | |
1039 | memset(md5_hash, 0, 16); | |
49a72dfb | 1040 | return 1; |
cfb6eeb4 YH |
1041 | } |
1042 | ||
49a72dfb AL |
1043 | int tcp_v4_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
1044 | struct sock *sk, struct request_sock *req, | |
1045 | struct sk_buff *skb) | |
cfb6eeb4 | 1046 | { |
49a72dfb AL |
1047 | struct tcp_md5sig_pool *hp; |
1048 | struct hash_desc *desc; | |
1049 | struct tcphdr *th = tcp_hdr(skb); | |
cfb6eeb4 YH |
1050 | __be32 saddr, daddr; |
1051 | ||
1052 | if (sk) { | |
1053 | saddr = inet_sk(sk)->saddr; | |
1054 | daddr = inet_sk(sk)->daddr; | |
49a72dfb AL |
1055 | } else if (req) { |
1056 | saddr = inet_rsk(req)->loc_addr; | |
1057 | daddr = inet_rsk(req)->rmt_addr; | |
cfb6eeb4 | 1058 | } else { |
49a72dfb AL |
1059 | const struct iphdr *iph = ip_hdr(skb); |
1060 | saddr = iph->saddr; | |
1061 | daddr = iph->daddr; | |
cfb6eeb4 | 1062 | } |
49a72dfb AL |
1063 | |
1064 | hp = tcp_get_md5sig_pool(); | |
1065 | if (!hp) | |
1066 | goto clear_hash_noput; | |
1067 | desc = &hp->md5_desc; | |
1068 | ||
1069 | if (crypto_hash_init(desc)) | |
1070 | goto clear_hash; | |
1071 | ||
1072 | if (tcp_v4_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
1073 | goto clear_hash; | |
1074 | if (tcp_md5_hash_header(hp, th)) | |
1075 | goto clear_hash; | |
1076 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
1077 | goto clear_hash; | |
1078 | if (tcp_md5_hash_key(hp, key)) | |
1079 | goto clear_hash; | |
1080 | if (crypto_hash_final(desc, md5_hash)) | |
1081 | goto clear_hash; | |
1082 | ||
1083 | tcp_put_md5sig_pool(); | |
1084 | return 0; | |
1085 | ||
1086 | clear_hash: | |
1087 | tcp_put_md5sig_pool(); | |
1088 | clear_hash_noput: | |
1089 | memset(md5_hash, 0, 16); | |
1090 | return 1; | |
cfb6eeb4 YH |
1091 | } |
1092 | ||
49a72dfb | 1093 | EXPORT_SYMBOL(tcp_v4_md5_hash_skb); |
cfb6eeb4 | 1094 | |
7174259e | 1095 | static int tcp_v4_inbound_md5_hash(struct sock *sk, struct sk_buff *skb) |
cfb6eeb4 YH |
1096 | { |
1097 | /* | |
1098 | * This gets called for each TCP segment that arrives | |
1099 | * so we want to be efficient. | |
1100 | * We have 3 drop cases: | |
1101 | * o No MD5 hash and one expected. | |
1102 | * o MD5 hash and we're not expecting one. | |
1103 | * o MD5 hash and its wrong. | |
1104 | */ | |
1105 | __u8 *hash_location = NULL; | |
1106 | struct tcp_md5sig_key *hash_expected; | |
eddc9ec5 | 1107 | const struct iphdr *iph = ip_hdr(skb); |
aa8223c7 | 1108 | struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 1109 | int genhash; |
cfb6eeb4 YH |
1110 | unsigned char newhash[16]; |
1111 | ||
1112 | hash_expected = tcp_v4_md5_do_lookup(sk, iph->saddr); | |
7d5d5525 | 1113 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 1114 | |
cfb6eeb4 YH |
1115 | /* We've parsed the options - do we have a hash? */ |
1116 | if (!hash_expected && !hash_location) | |
1117 | return 0; | |
1118 | ||
1119 | if (hash_expected && !hash_location) { | |
785957d3 | 1120 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
cfb6eeb4 YH |
1121 | return 1; |
1122 | } | |
1123 | ||
1124 | if (!hash_expected && hash_location) { | |
785957d3 | 1125 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
cfb6eeb4 YH |
1126 | return 1; |
1127 | } | |
1128 | ||
1129 | /* Okay, so this is hash_expected and hash_location - | |
1130 | * so we need to calculate the checksum. | |
1131 | */ | |
49a72dfb AL |
1132 | genhash = tcp_v4_md5_hash_skb(newhash, |
1133 | hash_expected, | |
1134 | NULL, NULL, skb); | |
cfb6eeb4 YH |
1135 | |
1136 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { | |
1137 | if (net_ratelimit()) { | |
673d57e7 HH |
1138 | printk(KERN_INFO "MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s\n", |
1139 | &iph->saddr, ntohs(th->source), | |
1140 | &iph->daddr, ntohs(th->dest), | |
cfb6eeb4 | 1141 | genhash ? " tcp_v4_calc_md5_hash failed" : ""); |
cfb6eeb4 YH |
1142 | } |
1143 | return 1; | |
1144 | } | |
1145 | return 0; | |
1146 | } | |
1147 | ||
1148 | #endif | |
1149 | ||
72a3effa | 1150 | struct request_sock_ops tcp_request_sock_ops __read_mostly = { |
1da177e4 | 1151 | .family = PF_INET, |
2e6599cb | 1152 | .obj_size = sizeof(struct tcp_request_sock), |
1da177e4 | 1153 | .rtx_syn_ack = tcp_v4_send_synack, |
60236fdd ACM |
1154 | .send_ack = tcp_v4_reqsk_send_ack, |
1155 | .destructor = tcp_v4_reqsk_destructor, | |
1da177e4 LT |
1156 | .send_reset = tcp_v4_send_reset, |
1157 | }; | |
1158 | ||
cfb6eeb4 | 1159 | #ifdef CONFIG_TCP_MD5SIG |
b6332e6c | 1160 | static struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = { |
cfb6eeb4 | 1161 | .md5_lookup = tcp_v4_reqsk_md5_lookup, |
cfb6eeb4 | 1162 | }; |
b6332e6c | 1163 | #endif |
cfb6eeb4 | 1164 | |
6d6ee43e ACM |
1165 | static struct timewait_sock_ops tcp_timewait_sock_ops = { |
1166 | .twsk_obj_size = sizeof(struct tcp_timewait_sock), | |
1167 | .twsk_unique = tcp_twsk_unique, | |
cfb6eeb4 | 1168 | .twsk_destructor= tcp_twsk_destructor, |
6d6ee43e ACM |
1169 | }; |
1170 | ||
1da177e4 LT |
1171 | int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) |
1172 | { | |
2e6599cb | 1173 | struct inet_request_sock *ireq; |
1da177e4 | 1174 | struct tcp_options_received tmp_opt; |
60236fdd | 1175 | struct request_sock *req; |
eddc9ec5 ACM |
1176 | __be32 saddr = ip_hdr(skb)->saddr; |
1177 | __be32 daddr = ip_hdr(skb)->daddr; | |
1da177e4 LT |
1178 | __u32 isn = TCP_SKB_CB(skb)->when; |
1179 | struct dst_entry *dst = NULL; | |
1180 | #ifdef CONFIG_SYN_COOKIES | |
1181 | int want_cookie = 0; | |
1182 | #else | |
1183 | #define want_cookie 0 /* Argh, why doesn't gcc optimize this :( */ | |
1184 | #endif | |
1185 | ||
1186 | /* Never answer to SYNs send to broadcast or multicast */ | |
ee6b9673 | 1187 | if (skb->rtable->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) |
1da177e4 LT |
1188 | goto drop; |
1189 | ||
1190 | /* TW buckets are converted to open requests without | |
1191 | * limitations, they conserve resources and peer is | |
1192 | * evidently real one. | |
1193 | */ | |
463c84b9 | 1194 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 LT |
1195 | #ifdef CONFIG_SYN_COOKIES |
1196 | if (sysctl_tcp_syncookies) { | |
1197 | want_cookie = 1; | |
1198 | } else | |
1199 | #endif | |
1200 | goto drop; | |
1201 | } | |
1202 | ||
1203 | /* Accept backlog is full. If we have already queued enough | |
1204 | * of warm entries in syn queue, drop request. It is better than | |
1205 | * clogging syn queue with openreqs with exponentially increasing | |
1206 | * timeout. | |
1207 | */ | |
463c84b9 | 1208 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1209 | goto drop; |
1210 | ||
ce4a7d0d | 1211 | req = inet_reqsk_alloc(&tcp_request_sock_ops); |
1da177e4 LT |
1212 | if (!req) |
1213 | goto drop; | |
1214 | ||
cfb6eeb4 YH |
1215 | #ifdef CONFIG_TCP_MD5SIG |
1216 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv4_ops; | |
1217 | #endif | |
1218 | ||
1da177e4 LT |
1219 | tcp_clear_options(&tmp_opt); |
1220 | tmp_opt.mss_clamp = 536; | |
1221 | tmp_opt.user_mss = tcp_sk(sk)->rx_opt.user_mss; | |
1222 | ||
1223 | tcp_parse_options(skb, &tmp_opt, 0); | |
1224 | ||
4dfc2817 | 1225 | if (want_cookie && !tmp_opt.saw_tstamp) |
1da177e4 | 1226 | tcp_clear_options(&tmp_opt); |
1da177e4 LT |
1227 | |
1228 | if (tmp_opt.saw_tstamp && !tmp_opt.rcv_tsval) { | |
1229 | /* Some OSes (unknown ones, but I see them on web server, which | |
1230 | * contains information interesting only for windows' | |
1231 | * users) do not send their stamp in SYN. It is easy case. | |
1232 | * We simply do not advertise TS support. | |
1233 | */ | |
1234 | tmp_opt.saw_tstamp = 0; | |
1235 | tmp_opt.tstamp_ok = 0; | |
1236 | } | |
1237 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; | |
1238 | ||
1239 | tcp_openreq_init(req, &tmp_opt, skb); | |
1240 | ||
4237c75c VY |
1241 | if (security_inet_conn_request(sk, skb, req)) |
1242 | goto drop_and_free; | |
1243 | ||
2e6599cb ACM |
1244 | ireq = inet_rsk(req); |
1245 | ireq->loc_addr = daddr; | |
1246 | ireq->rmt_addr = saddr; | |
88ef4a5a | 1247 | ireq->no_srccheck = inet_sk(sk)->transparent; |
2e6599cb | 1248 | ireq->opt = tcp_v4_save_options(sk, skb); |
1da177e4 | 1249 | if (!want_cookie) |
aa8223c7 | 1250 | TCP_ECN_create_request(req, tcp_hdr(skb)); |
1da177e4 LT |
1251 | |
1252 | if (want_cookie) { | |
1253 | #ifdef CONFIG_SYN_COOKIES | |
1254 | syn_flood_warning(skb); | |
4dfc2817 | 1255 | req->cookie_ts = tmp_opt.tstamp_ok; |
1da177e4 LT |
1256 | #endif |
1257 | isn = cookie_v4_init_sequence(sk, skb, &req->mss); | |
1258 | } else if (!isn) { | |
1259 | struct inet_peer *peer = NULL; | |
1260 | ||
1261 | /* VJ's idea. We save last timestamp seen | |
1262 | * from the destination in peer table, when entering | |
1263 | * state TIME-WAIT, and check against it before | |
1264 | * accepting new connection request. | |
1265 | * | |
1266 | * If "isn" is not zero, this request hit alive | |
1267 | * timewait bucket, so that all the necessary checks | |
1268 | * are made in the function processing timewait state. | |
1269 | */ | |
1270 | if (tmp_opt.saw_tstamp && | |
295ff7ed | 1271 | tcp_death_row.sysctl_tw_recycle && |
463c84b9 | 1272 | (dst = inet_csk_route_req(sk, req)) != NULL && |
1da177e4 LT |
1273 | (peer = rt_get_peer((struct rtable *)dst)) != NULL && |
1274 | peer->v4daddr == saddr) { | |
9d729f72 | 1275 | if (get_seconds() < peer->tcp_ts_stamp + TCP_PAWS_MSL && |
1da177e4 LT |
1276 | (s32)(peer->tcp_ts - req->ts_recent) > |
1277 | TCP_PAWS_WINDOW) { | |
de0744af | 1278 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); |
7cd04fa7 | 1279 | goto drop_and_release; |
1da177e4 LT |
1280 | } |
1281 | } | |
1282 | /* Kill the following clause, if you dislike this way. */ | |
1283 | else if (!sysctl_tcp_syncookies && | |
463c84b9 | 1284 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < |
1da177e4 LT |
1285 | (sysctl_max_syn_backlog >> 2)) && |
1286 | (!peer || !peer->tcp_ts_stamp) && | |
1287 | (!dst || !dst_metric(dst, RTAX_RTT))) { | |
1288 | /* Without syncookies last quarter of | |
1289 | * backlog is filled with destinations, | |
1290 | * proven to be alive. | |
1291 | * It means that we continue to communicate | |
1292 | * to destinations, already remembered | |
1293 | * to the moment of synflood. | |
1294 | */ | |
673d57e7 HH |
1295 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI4/%u\n", |
1296 | &saddr, ntohs(tcp_hdr(skb)->source)); | |
7cd04fa7 | 1297 | goto drop_and_release; |
1da177e4 LT |
1298 | } |
1299 | ||
a94f723d | 1300 | isn = tcp_v4_init_sequence(skb); |
1da177e4 | 1301 | } |
2e6599cb | 1302 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1303 | |
7cd04fa7 | 1304 | if (__tcp_v4_send_synack(sk, req, dst) || want_cookie) |
1da177e4 LT |
1305 | goto drop_and_free; |
1306 | ||
7cd04fa7 | 1307 | inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1da177e4 LT |
1308 | return 0; |
1309 | ||
7cd04fa7 DL |
1310 | drop_and_release: |
1311 | dst_release(dst); | |
1da177e4 | 1312 | drop_and_free: |
60236fdd | 1313 | reqsk_free(req); |
1da177e4 | 1314 | drop: |
1da177e4 LT |
1315 | return 0; |
1316 | } | |
1317 | ||
1318 | ||
1319 | /* | |
1320 | * The three way handshake has completed - we got a valid synack - | |
1321 | * now create the new socket. | |
1322 | */ | |
1323 | struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1324 | struct request_sock *req, |
1da177e4 LT |
1325 | struct dst_entry *dst) |
1326 | { | |
2e6599cb | 1327 | struct inet_request_sock *ireq; |
1da177e4 LT |
1328 | struct inet_sock *newinet; |
1329 | struct tcp_sock *newtp; | |
1330 | struct sock *newsk; | |
cfb6eeb4 YH |
1331 | #ifdef CONFIG_TCP_MD5SIG |
1332 | struct tcp_md5sig_key *key; | |
1333 | #endif | |
1da177e4 LT |
1334 | |
1335 | if (sk_acceptq_is_full(sk)) | |
1336 | goto exit_overflow; | |
1337 | ||
463c84b9 | 1338 | if (!dst && (dst = inet_csk_route_req(sk, req)) == NULL) |
1da177e4 LT |
1339 | goto exit; |
1340 | ||
1341 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1342 | if (!newsk) | |
1343 | goto exit; | |
1344 | ||
bcd76111 | 1345 | newsk->sk_gso_type = SKB_GSO_TCPV4; |
6cbb0df7 | 1346 | sk_setup_caps(newsk, dst); |
1da177e4 LT |
1347 | |
1348 | newtp = tcp_sk(newsk); | |
1349 | newinet = inet_sk(newsk); | |
2e6599cb ACM |
1350 | ireq = inet_rsk(req); |
1351 | newinet->daddr = ireq->rmt_addr; | |
1352 | newinet->rcv_saddr = ireq->loc_addr; | |
1353 | newinet->saddr = ireq->loc_addr; | |
1354 | newinet->opt = ireq->opt; | |
1355 | ireq->opt = NULL; | |
463c84b9 | 1356 | newinet->mc_index = inet_iif(skb); |
eddc9ec5 | 1357 | newinet->mc_ttl = ip_hdr(skb)->ttl; |
d83d8461 | 1358 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1359 | if (newinet->opt) |
d83d8461 | 1360 | inet_csk(newsk)->icsk_ext_hdr_len = newinet->opt->optlen; |
1da177e4 LT |
1361 | newinet->id = newtp->write_seq ^ jiffies; |
1362 | ||
5d424d5a | 1363 | tcp_mtup_init(newsk); |
1da177e4 LT |
1364 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1365 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
f5fff5dc TQ |
1366 | if (tcp_sk(sk)->rx_opt.user_mss && |
1367 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1368 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1369 | ||
1da177e4 LT |
1370 | tcp_initialize_rcv_mss(newsk); |
1371 | ||
cfb6eeb4 YH |
1372 | #ifdef CONFIG_TCP_MD5SIG |
1373 | /* Copy over the MD5 key from the original socket */ | |
1374 | if ((key = tcp_v4_md5_do_lookup(sk, newinet->daddr)) != NULL) { | |
1375 | /* | |
1376 | * We're using one, so create a matching key | |
1377 | * on the newsk structure. If we fail to get | |
1378 | * memory, then we end up not copying the key | |
1379 | * across. Shucks. | |
1380 | */ | |
f6685938 ACM |
1381 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1382 | if (newkey != NULL) | |
cfb6eeb4 YH |
1383 | tcp_v4_md5_do_add(newsk, inet_sk(sk)->daddr, |
1384 | newkey, key->keylen); | |
49a72dfb | 1385 | newsk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 YH |
1386 | } |
1387 | #endif | |
1388 | ||
ab1e0a13 ACM |
1389 | __inet_hash_nolisten(newsk); |
1390 | __inet_inherit_port(sk, newsk); | |
1da177e4 LT |
1391 | |
1392 | return newsk; | |
1393 | ||
1394 | exit_overflow: | |
de0744af | 1395 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
1da177e4 | 1396 | exit: |
de0744af | 1397 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1398 | dst_release(dst); |
1399 | return NULL; | |
1400 | } | |
1401 | ||
1402 | static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) | |
1403 | { | |
aa8223c7 | 1404 | struct tcphdr *th = tcp_hdr(skb); |
eddc9ec5 | 1405 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 1406 | struct sock *nsk; |
60236fdd | 1407 | struct request_sock **prev; |
1da177e4 | 1408 | /* Find possible connection requests. */ |
463c84b9 ACM |
1409 | struct request_sock *req = inet_csk_search_req(sk, &prev, th->source, |
1410 | iph->saddr, iph->daddr); | |
1da177e4 LT |
1411 | if (req) |
1412 | return tcp_check_req(sk, skb, req, prev); | |
1413 | ||
3b1e0a65 | 1414 | nsk = inet_lookup_established(sock_net(sk), &tcp_hashinfo, iph->saddr, |
c67499c0 | 1415 | th->source, iph->daddr, th->dest, inet_iif(skb)); |
1da177e4 LT |
1416 | |
1417 | if (nsk) { | |
1418 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1419 | bh_lock_sock(nsk); | |
1420 | return nsk; | |
1421 | } | |
9469c7b4 | 1422 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1423 | return NULL; |
1424 | } | |
1425 | ||
1426 | #ifdef CONFIG_SYN_COOKIES | |
1427 | if (!th->rst && !th->syn && th->ack) | |
1428 | sk = cookie_v4_check(sk, skb, &(IPCB(skb)->opt)); | |
1429 | #endif | |
1430 | return sk; | |
1431 | } | |
1432 | ||
b51655b9 | 1433 | static __sum16 tcp_v4_checksum_init(struct sk_buff *skb) |
1da177e4 | 1434 | { |
eddc9ec5 ACM |
1435 | const struct iphdr *iph = ip_hdr(skb); |
1436 | ||
84fa7933 | 1437 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
eddc9ec5 ACM |
1438 | if (!tcp_v4_check(skb->len, iph->saddr, |
1439 | iph->daddr, skb->csum)) { | |
fb286bb2 | 1440 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1441 | return 0; |
fb286bb2 | 1442 | } |
1da177e4 | 1443 | } |
fb286bb2 | 1444 | |
eddc9ec5 | 1445 | skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, |
fb286bb2 HX |
1446 | skb->len, IPPROTO_TCP, 0); |
1447 | ||
1da177e4 | 1448 | if (skb->len <= 76) { |
fb286bb2 | 1449 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1450 | } |
1451 | return 0; | |
1452 | } | |
1453 | ||
1454 | ||
1455 | /* The socket must have it's spinlock held when we get | |
1456 | * here. | |
1457 | * | |
1458 | * We have a potential double-lock case here, so even when | |
1459 | * doing backlog processing we use the BH locking scheme. | |
1460 | * This is because we cannot sleep with the original spinlock | |
1461 | * held. | |
1462 | */ | |
1463 | int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1464 | { | |
cfb6eeb4 YH |
1465 | struct sock *rsk; |
1466 | #ifdef CONFIG_TCP_MD5SIG | |
1467 | /* | |
1468 | * We really want to reject the packet as early as possible | |
1469 | * if: | |
1470 | * o We're expecting an MD5'd packet and this is no MD5 tcp option | |
1471 | * o There is an MD5 option and we're not expecting one | |
1472 | */ | |
7174259e | 1473 | if (tcp_v4_inbound_md5_hash(sk, skb)) |
cfb6eeb4 YH |
1474 | goto discard; |
1475 | #endif | |
1476 | ||
1da177e4 LT |
1477 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
1478 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1479 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) { |
cfb6eeb4 | 1480 | rsk = sk; |
1da177e4 | 1481 | goto reset; |
cfb6eeb4 | 1482 | } |
1da177e4 LT |
1483 | TCP_CHECK_TIMER(sk); |
1484 | return 0; | |
1485 | } | |
1486 | ||
ab6a5bb6 | 1487 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1488 | goto csum_err; |
1489 | ||
1490 | if (sk->sk_state == TCP_LISTEN) { | |
1491 | struct sock *nsk = tcp_v4_hnd_req(sk, skb); | |
1492 | if (!nsk) | |
1493 | goto discard; | |
1494 | ||
1495 | if (nsk != sk) { | |
cfb6eeb4 YH |
1496 | if (tcp_child_process(sk, nsk, skb)) { |
1497 | rsk = nsk; | |
1da177e4 | 1498 | goto reset; |
cfb6eeb4 | 1499 | } |
1da177e4 LT |
1500 | return 0; |
1501 | } | |
1502 | } | |
1503 | ||
1504 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1505 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) { |
cfb6eeb4 | 1506 | rsk = sk; |
1da177e4 | 1507 | goto reset; |
cfb6eeb4 | 1508 | } |
1da177e4 LT |
1509 | TCP_CHECK_TIMER(sk); |
1510 | return 0; | |
1511 | ||
1512 | reset: | |
cfb6eeb4 | 1513 | tcp_v4_send_reset(rsk, skb); |
1da177e4 LT |
1514 | discard: |
1515 | kfree_skb(skb); | |
1516 | /* Be careful here. If this function gets more complicated and | |
1517 | * gcc suffers from register pressure on the x86, sk (in %ebx) | |
1518 | * might be destroyed here. This current version compiles correctly, | |
1519 | * but you have been warned. | |
1520 | */ | |
1521 | return 0; | |
1522 | ||
1523 | csum_err: | |
63231bdd | 1524 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1525 | goto discard; |
1526 | } | |
1527 | ||
1528 | /* | |
1529 | * From tcp_input.c | |
1530 | */ | |
1531 | ||
1532 | int tcp_v4_rcv(struct sk_buff *skb) | |
1533 | { | |
eddc9ec5 | 1534 | const struct iphdr *iph; |
1da177e4 LT |
1535 | struct tcphdr *th; |
1536 | struct sock *sk; | |
1537 | int ret; | |
a86b1e30 | 1538 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1539 | |
1540 | if (skb->pkt_type != PACKET_HOST) | |
1541 | goto discard_it; | |
1542 | ||
1543 | /* Count it even if it's bad */ | |
63231bdd | 1544 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1545 | |
1546 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1547 | goto discard_it; | |
1548 | ||
aa8223c7 | 1549 | th = tcp_hdr(skb); |
1da177e4 LT |
1550 | |
1551 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1552 | goto bad_packet; | |
1553 | if (!pskb_may_pull(skb, th->doff * 4)) | |
1554 | goto discard_it; | |
1555 | ||
1556 | /* An explanation is required here, I think. | |
1557 | * Packet length and doff are validated by header prediction, | |
caa20d9a | 1558 | * provided case of th->doff==0 is eliminated. |
1da177e4 | 1559 | * So, we defer the checks. */ |
60476372 | 1560 | if (!skb_csum_unnecessary(skb) && tcp_v4_checksum_init(skb)) |
1da177e4 LT |
1561 | goto bad_packet; |
1562 | ||
aa8223c7 | 1563 | th = tcp_hdr(skb); |
eddc9ec5 | 1564 | iph = ip_hdr(skb); |
1da177e4 LT |
1565 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1566 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1567 | skb->len - th->doff * 4); | |
1568 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1569 | TCP_SKB_CB(skb)->when = 0; | |
eddc9ec5 | 1570 | TCP_SKB_CB(skb)->flags = iph->tos; |
1da177e4 LT |
1571 | TCP_SKB_CB(skb)->sacked = 0; |
1572 | ||
9a1f27c4 | 1573 | sk = __inet_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1574 | if (!sk) |
1575 | goto no_tcp_socket; | |
1576 | ||
1577 | process: | |
1578 | if (sk->sk_state == TCP_TIME_WAIT) | |
1579 | goto do_time_wait; | |
1580 | ||
1581 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1582 | goto discard_and_relse; | |
b59c2701 | 1583 | nf_reset(skb); |
1da177e4 | 1584 | |
fda9ef5d | 1585 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1586 | goto discard_and_relse; |
1587 | ||
1588 | skb->dev = NULL; | |
1589 | ||
c6366184 | 1590 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1591 | ret = 0; |
1592 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 CL |
1593 | #ifdef CONFIG_NET_DMA |
1594 | struct tcp_sock *tp = tcp_sk(sk); | |
1595 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) | |
1596 | tp->ucopy.dma_chan = get_softnet_dma(); | |
1597 | if (tp->ucopy.dma_chan) | |
1da177e4 | 1598 | ret = tcp_v4_do_rcv(sk, skb); |
1a2449a8 CL |
1599 | else |
1600 | #endif | |
1601 | { | |
1602 | if (!tcp_prequeue(sk, skb)) | |
1603 | ret = tcp_v4_do_rcv(sk, skb); | |
1604 | } | |
1da177e4 LT |
1605 | } else |
1606 | sk_add_backlog(sk, skb); | |
1607 | bh_unlock_sock(sk); | |
1608 | ||
1609 | sock_put(sk); | |
1610 | ||
1611 | return ret; | |
1612 | ||
1613 | no_tcp_socket: | |
1614 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1615 | goto discard_it; | |
1616 | ||
1617 | if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { | |
1618 | bad_packet: | |
63231bdd | 1619 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1620 | } else { |
cfb6eeb4 | 1621 | tcp_v4_send_reset(NULL, skb); |
1da177e4 LT |
1622 | } |
1623 | ||
1624 | discard_it: | |
1625 | /* Discard frame. */ | |
1626 | kfree_skb(skb); | |
e905a9ed | 1627 | return 0; |
1da177e4 LT |
1628 | |
1629 | discard_and_relse: | |
1630 | sock_put(sk); | |
1631 | goto discard_it; | |
1632 | ||
1633 | do_time_wait: | |
1634 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1635 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1636 | goto discard_it; |
1637 | } | |
1638 | ||
1639 | if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { | |
63231bdd | 1640 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
9469c7b4 | 1641 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1642 | goto discard_it; |
1643 | } | |
9469c7b4 | 1644 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 | 1645 | case TCP_TW_SYN: { |
c346dca1 | 1646 | struct sock *sk2 = inet_lookup_listener(dev_net(skb->dev), |
c67499c0 | 1647 | &tcp_hashinfo, |
eddc9ec5 | 1648 | iph->daddr, th->dest, |
463c84b9 | 1649 | inet_iif(skb)); |
1da177e4 | 1650 | if (sk2) { |
9469c7b4 YH |
1651 | inet_twsk_deschedule(inet_twsk(sk), &tcp_death_row); |
1652 | inet_twsk_put(inet_twsk(sk)); | |
1da177e4 LT |
1653 | sk = sk2; |
1654 | goto process; | |
1655 | } | |
1656 | /* Fall through to ACK */ | |
1657 | } | |
1658 | case TCP_TW_ACK: | |
1659 | tcp_v4_timewait_ack(sk, skb); | |
1660 | break; | |
1661 | case TCP_TW_RST: | |
1662 | goto no_tcp_socket; | |
1663 | case TCP_TW_SUCCESS:; | |
1664 | } | |
1665 | goto discard_it; | |
1666 | } | |
1667 | ||
1da177e4 LT |
1668 | /* VJ's idea. Save last timestamp seen from this destination |
1669 | * and hold it at least for normal timewait interval to use for duplicate | |
1670 | * segment detection in subsequent connections, before they enter synchronized | |
1671 | * state. | |
1672 | */ | |
1673 | ||
1674 | int tcp_v4_remember_stamp(struct sock *sk) | |
1675 | { | |
1676 | struct inet_sock *inet = inet_sk(sk); | |
1677 | struct tcp_sock *tp = tcp_sk(sk); | |
1678 | struct rtable *rt = (struct rtable *)__sk_dst_get(sk); | |
1679 | struct inet_peer *peer = NULL; | |
1680 | int release_it = 0; | |
1681 | ||
1682 | if (!rt || rt->rt_dst != inet->daddr) { | |
1683 | peer = inet_getpeer(inet->daddr, 1); | |
1684 | release_it = 1; | |
1685 | } else { | |
1686 | if (!rt->peer) | |
1687 | rt_bind_peer(rt, 1); | |
1688 | peer = rt->peer; | |
1689 | } | |
1690 | ||
1691 | if (peer) { | |
1692 | if ((s32)(peer->tcp_ts - tp->rx_opt.ts_recent) <= 0 || | |
9d729f72 | 1693 | (peer->tcp_ts_stamp + TCP_PAWS_MSL < get_seconds() && |
1da177e4 LT |
1694 | peer->tcp_ts_stamp <= tp->rx_opt.ts_recent_stamp)) { |
1695 | peer->tcp_ts_stamp = tp->rx_opt.ts_recent_stamp; | |
1696 | peer->tcp_ts = tp->rx_opt.ts_recent; | |
1697 | } | |
1698 | if (release_it) | |
1699 | inet_putpeer(peer); | |
1700 | return 1; | |
1701 | } | |
1702 | ||
1703 | return 0; | |
1704 | } | |
1705 | ||
8feaf0c0 | 1706 | int tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw) |
1da177e4 | 1707 | { |
8feaf0c0 | 1708 | struct inet_peer *peer = inet_getpeer(tw->tw_daddr, 1); |
1da177e4 LT |
1709 | |
1710 | if (peer) { | |
8feaf0c0 ACM |
1711 | const struct tcp_timewait_sock *tcptw = tcp_twsk((struct sock *)tw); |
1712 | ||
1713 | if ((s32)(peer->tcp_ts - tcptw->tw_ts_recent) <= 0 || | |
9d729f72 | 1714 | (peer->tcp_ts_stamp + TCP_PAWS_MSL < get_seconds() && |
8feaf0c0 ACM |
1715 | peer->tcp_ts_stamp <= tcptw->tw_ts_recent_stamp)) { |
1716 | peer->tcp_ts_stamp = tcptw->tw_ts_recent_stamp; | |
1717 | peer->tcp_ts = tcptw->tw_ts_recent; | |
1da177e4 LT |
1718 | } |
1719 | inet_putpeer(peer); | |
1720 | return 1; | |
1721 | } | |
1722 | ||
1723 | return 0; | |
1724 | } | |
1725 | ||
8292a17a | 1726 | struct inet_connection_sock_af_ops ipv4_specific = { |
543d9cfe ACM |
1727 | .queue_xmit = ip_queue_xmit, |
1728 | .send_check = tcp_v4_send_check, | |
1729 | .rebuild_header = inet_sk_rebuild_header, | |
1730 | .conn_request = tcp_v4_conn_request, | |
1731 | .syn_recv_sock = tcp_v4_syn_recv_sock, | |
1732 | .remember_stamp = tcp_v4_remember_stamp, | |
1733 | .net_header_len = sizeof(struct iphdr), | |
1734 | .setsockopt = ip_setsockopt, | |
1735 | .getsockopt = ip_getsockopt, | |
1736 | .addr2sockaddr = inet_csk_addr2sockaddr, | |
1737 | .sockaddr_len = sizeof(struct sockaddr_in), | |
ab1e0a13 | 1738 | .bind_conflict = inet_csk_bind_conflict, |
3fdadf7d | 1739 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1740 | .compat_setsockopt = compat_ip_setsockopt, |
1741 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 1742 | #endif |
1da177e4 LT |
1743 | }; |
1744 | ||
cfb6eeb4 | 1745 | #ifdef CONFIG_TCP_MD5SIG |
b6332e6c | 1746 | static struct tcp_sock_af_ops tcp_sock_ipv4_specific = { |
cfb6eeb4 | 1747 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1748 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 YH |
1749 | .md5_add = tcp_v4_md5_add_func, |
1750 | .md5_parse = tcp_v4_parse_md5_keys, | |
cfb6eeb4 | 1751 | }; |
b6332e6c | 1752 | #endif |
cfb6eeb4 | 1753 | |
1da177e4 LT |
1754 | /* NOTE: A lot of things set to zero explicitly by call to |
1755 | * sk_alloc() so need not be done here. | |
1756 | */ | |
1757 | static int tcp_v4_init_sock(struct sock *sk) | |
1758 | { | |
6687e988 | 1759 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1760 | struct tcp_sock *tp = tcp_sk(sk); |
1761 | ||
1762 | skb_queue_head_init(&tp->out_of_order_queue); | |
1763 | tcp_init_xmit_timers(sk); | |
1764 | tcp_prequeue_init(tp); | |
1765 | ||
6687e988 | 1766 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1767 | tp->mdev = TCP_TIMEOUT_INIT; |
1768 | ||
1769 | /* So many TCP implementations out there (incorrectly) count the | |
1770 | * initial SYN frame in their delayed-ACK and congestion control | |
1771 | * algorithms that we must have the following bandaid to talk | |
1772 | * efficiently to them. -DaveM | |
1773 | */ | |
1774 | tp->snd_cwnd = 2; | |
1775 | ||
1776 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1777 | * initialization of these values. | |
1778 | */ | |
1779 | tp->snd_ssthresh = 0x7fffffff; /* Infinity */ | |
1780 | tp->snd_cwnd_clamp = ~0; | |
c1b4a7e6 | 1781 | tp->mss_cache = 536; |
1da177e4 LT |
1782 | |
1783 | tp->reordering = sysctl_tcp_reordering; | |
6687e988 | 1784 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
1da177e4 LT |
1785 | |
1786 | sk->sk_state = TCP_CLOSE; | |
1787 | ||
1788 | sk->sk_write_space = sk_stream_write_space; | |
1789 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1790 | ||
8292a17a | 1791 | icsk->icsk_af_ops = &ipv4_specific; |
d83d8461 | 1792 | icsk->icsk_sync_mss = tcp_sync_mss; |
cfb6eeb4 YH |
1793 | #ifdef CONFIG_TCP_MD5SIG |
1794 | tp->af_specific = &tcp_sock_ipv4_specific; | |
1795 | #endif | |
1da177e4 LT |
1796 | |
1797 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; | |
1798 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1799 | ||
1800 | atomic_inc(&tcp_sockets_allocated); | |
1801 | ||
1802 | return 0; | |
1803 | } | |
1804 | ||
7d06b2e0 | 1805 | void tcp_v4_destroy_sock(struct sock *sk) |
1da177e4 LT |
1806 | { |
1807 | struct tcp_sock *tp = tcp_sk(sk); | |
1808 | ||
1809 | tcp_clear_xmit_timers(sk); | |
1810 | ||
6687e988 | 1811 | tcp_cleanup_congestion_control(sk); |
317a76f9 | 1812 | |
1da177e4 | 1813 | /* Cleanup up the write buffer. */ |
fe067e8a | 1814 | tcp_write_queue_purge(sk); |
1da177e4 LT |
1815 | |
1816 | /* Cleans up our, hopefully empty, out_of_order_queue. */ | |
e905a9ed | 1817 | __skb_queue_purge(&tp->out_of_order_queue); |
1da177e4 | 1818 | |
cfb6eeb4 YH |
1819 | #ifdef CONFIG_TCP_MD5SIG |
1820 | /* Clean up the MD5 key list, if any */ | |
1821 | if (tp->md5sig_info) { | |
1822 | tcp_v4_clear_md5_list(sk); | |
1823 | kfree(tp->md5sig_info); | |
1824 | tp->md5sig_info = NULL; | |
1825 | } | |
1826 | #endif | |
1827 | ||
1a2449a8 CL |
1828 | #ifdef CONFIG_NET_DMA |
1829 | /* Cleans up our sk_async_wait_queue */ | |
e905a9ed | 1830 | __skb_queue_purge(&sk->sk_async_wait_queue); |
1a2449a8 CL |
1831 | #endif |
1832 | ||
1da177e4 LT |
1833 | /* Clean prequeue, it must be empty really */ |
1834 | __skb_queue_purge(&tp->ucopy.prequeue); | |
1835 | ||
1836 | /* Clean up a referenced TCP bind bucket. */ | |
463c84b9 | 1837 | if (inet_csk(sk)->icsk_bind_hash) |
ab1e0a13 | 1838 | inet_put_port(sk); |
1da177e4 LT |
1839 | |
1840 | /* | |
1841 | * If sendmsg cached page exists, toss it. | |
1842 | */ | |
1843 | if (sk->sk_sndmsg_page) { | |
1844 | __free_page(sk->sk_sndmsg_page); | |
1845 | sk->sk_sndmsg_page = NULL; | |
1846 | } | |
1847 | ||
1848 | atomic_dec(&tcp_sockets_allocated); | |
1da177e4 LT |
1849 | } |
1850 | ||
1851 | EXPORT_SYMBOL(tcp_v4_destroy_sock); | |
1852 | ||
1853 | #ifdef CONFIG_PROC_FS | |
1854 | /* Proc filesystem TCP sock list dumping. */ | |
1855 | ||
3ab5aee7 | 1856 | static inline struct inet_timewait_sock *tw_head(struct hlist_nulls_head *head) |
1da177e4 | 1857 | { |
3ab5aee7 | 1858 | return hlist_nulls_empty(head) ? NULL : |
8feaf0c0 | 1859 | list_entry(head->first, struct inet_timewait_sock, tw_node); |
1da177e4 LT |
1860 | } |
1861 | ||
8feaf0c0 | 1862 | static inline struct inet_timewait_sock *tw_next(struct inet_timewait_sock *tw) |
1da177e4 | 1863 | { |
3ab5aee7 ED |
1864 | return !is_a_nulls(tw->tw_node.next) ? |
1865 | hlist_nulls_entry(tw->tw_node.next, typeof(*tw), tw_node) : NULL; | |
1da177e4 LT |
1866 | } |
1867 | ||
1868 | static void *listening_get_next(struct seq_file *seq, void *cur) | |
1869 | { | |
463c84b9 | 1870 | struct inet_connection_sock *icsk; |
1da177e4 LT |
1871 | struct hlist_node *node; |
1872 | struct sock *sk = cur; | |
5caea4ea | 1873 | struct inet_listen_hashbucket *ilb; |
5799de0b | 1874 | struct tcp_iter_state *st = seq->private; |
a4146b1b | 1875 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1876 | |
1877 | if (!sk) { | |
1878 | st->bucket = 0; | |
5caea4ea ED |
1879 | ilb = &tcp_hashinfo.listening_hash[0]; |
1880 | spin_lock_bh(&ilb->lock); | |
1881 | sk = sk_head(&ilb->head); | |
1da177e4 LT |
1882 | goto get_sk; |
1883 | } | |
5caea4ea | 1884 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
1da177e4 LT |
1885 | ++st->num; |
1886 | ||
1887 | if (st->state == TCP_SEQ_STATE_OPENREQ) { | |
60236fdd | 1888 | struct request_sock *req = cur; |
1da177e4 | 1889 | |
72a3effa | 1890 | icsk = inet_csk(st->syn_wait_sk); |
1da177e4 LT |
1891 | req = req->dl_next; |
1892 | while (1) { | |
1893 | while (req) { | |
bdccc4ca | 1894 | if (req->rsk_ops->family == st->family) { |
1da177e4 LT |
1895 | cur = req; |
1896 | goto out; | |
1897 | } | |
1898 | req = req->dl_next; | |
1899 | } | |
72a3effa | 1900 | if (++st->sbucket >= icsk->icsk_accept_queue.listen_opt->nr_table_entries) |
1da177e4 LT |
1901 | break; |
1902 | get_req: | |
463c84b9 | 1903 | req = icsk->icsk_accept_queue.listen_opt->syn_table[st->sbucket]; |
1da177e4 LT |
1904 | } |
1905 | sk = sk_next(st->syn_wait_sk); | |
1906 | st->state = TCP_SEQ_STATE_LISTENING; | |
463c84b9 | 1907 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 | 1908 | } else { |
e905a9ed | 1909 | icsk = inet_csk(sk); |
463c84b9 ACM |
1910 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1911 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) | |
1da177e4 | 1912 | goto start_req; |
463c84b9 | 1913 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 LT |
1914 | sk = sk_next(sk); |
1915 | } | |
1916 | get_sk: | |
1917 | sk_for_each_from(sk, node) { | |
878628fb | 1918 | if (sk->sk_family == st->family && net_eq(sock_net(sk), net)) { |
1da177e4 LT |
1919 | cur = sk; |
1920 | goto out; | |
1921 | } | |
e905a9ed | 1922 | icsk = inet_csk(sk); |
463c84b9 ACM |
1923 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1924 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) { | |
1da177e4 LT |
1925 | start_req: |
1926 | st->uid = sock_i_uid(sk); | |
1927 | st->syn_wait_sk = sk; | |
1928 | st->state = TCP_SEQ_STATE_OPENREQ; | |
1929 | st->sbucket = 0; | |
1930 | goto get_req; | |
1931 | } | |
463c84b9 | 1932 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 | 1933 | } |
5caea4ea | 1934 | spin_unlock_bh(&ilb->lock); |
0f7ff927 | 1935 | if (++st->bucket < INET_LHTABLE_SIZE) { |
5caea4ea ED |
1936 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
1937 | spin_lock_bh(&ilb->lock); | |
1938 | sk = sk_head(&ilb->head); | |
1da177e4 LT |
1939 | goto get_sk; |
1940 | } | |
1941 | cur = NULL; | |
1942 | out: | |
1943 | return cur; | |
1944 | } | |
1945 | ||
1946 | static void *listening_get_idx(struct seq_file *seq, loff_t *pos) | |
1947 | { | |
1948 | void *rc = listening_get_next(seq, NULL); | |
1949 | ||
1950 | while (rc && *pos) { | |
1951 | rc = listening_get_next(seq, rc); | |
1952 | --*pos; | |
1953 | } | |
1954 | return rc; | |
1955 | } | |
1956 | ||
6eac5604 AK |
1957 | static inline int empty_bucket(struct tcp_iter_state *st) |
1958 | { | |
3ab5aee7 ED |
1959 | return hlist_nulls_empty(&tcp_hashinfo.ehash[st->bucket].chain) && |
1960 | hlist_nulls_empty(&tcp_hashinfo.ehash[st->bucket].twchain); | |
6eac5604 AK |
1961 | } |
1962 | ||
1da177e4 LT |
1963 | static void *established_get_first(struct seq_file *seq) |
1964 | { | |
5799de0b | 1965 | struct tcp_iter_state *st = seq->private; |
a4146b1b | 1966 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1967 | void *rc = NULL; |
1968 | ||
6e04e021 | 1969 | for (st->bucket = 0; st->bucket < tcp_hashinfo.ehash_size; ++st->bucket) { |
1da177e4 | 1970 | struct sock *sk; |
3ab5aee7 | 1971 | struct hlist_nulls_node *node; |
8feaf0c0 | 1972 | struct inet_timewait_sock *tw; |
230140cf | 1973 | rwlock_t *lock = inet_ehash_lockp(&tcp_hashinfo, st->bucket); |
1da177e4 | 1974 | |
6eac5604 AK |
1975 | /* Lockless fast path for the common case of empty buckets */ |
1976 | if (empty_bucket(st)) | |
1977 | continue; | |
1978 | ||
230140cf | 1979 | read_lock_bh(lock); |
3ab5aee7 | 1980 | sk_nulls_for_each(sk, node, &tcp_hashinfo.ehash[st->bucket].chain) { |
f40c8174 | 1981 | if (sk->sk_family != st->family || |
878628fb | 1982 | !net_eq(sock_net(sk), net)) { |
1da177e4 LT |
1983 | continue; |
1984 | } | |
1985 | rc = sk; | |
1986 | goto out; | |
1987 | } | |
1988 | st->state = TCP_SEQ_STATE_TIME_WAIT; | |
8feaf0c0 | 1989 | inet_twsk_for_each(tw, node, |
dbca9b27 | 1990 | &tcp_hashinfo.ehash[st->bucket].twchain) { |
28518fc1 | 1991 | if (tw->tw_family != st->family || |
878628fb | 1992 | !net_eq(twsk_net(tw), net)) { |
1da177e4 LT |
1993 | continue; |
1994 | } | |
1995 | rc = tw; | |
1996 | goto out; | |
1997 | } | |
230140cf | 1998 | read_unlock_bh(lock); |
1da177e4 LT |
1999 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
2000 | } | |
2001 | out: | |
2002 | return rc; | |
2003 | } | |
2004 | ||
2005 | static void *established_get_next(struct seq_file *seq, void *cur) | |
2006 | { | |
2007 | struct sock *sk = cur; | |
8feaf0c0 | 2008 | struct inet_timewait_sock *tw; |
3ab5aee7 | 2009 | struct hlist_nulls_node *node; |
5799de0b | 2010 | struct tcp_iter_state *st = seq->private; |
a4146b1b | 2011 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2012 | |
2013 | ++st->num; | |
2014 | ||
2015 | if (st->state == TCP_SEQ_STATE_TIME_WAIT) { | |
2016 | tw = cur; | |
2017 | tw = tw_next(tw); | |
2018 | get_tw: | |
878628fb | 2019 | while (tw && (tw->tw_family != st->family || !net_eq(twsk_net(tw), net))) { |
1da177e4 LT |
2020 | tw = tw_next(tw); |
2021 | } | |
2022 | if (tw) { | |
2023 | cur = tw; | |
2024 | goto out; | |
2025 | } | |
230140cf | 2026 | read_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
1da177e4 LT |
2027 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
2028 | ||
6eac5604 AK |
2029 | /* Look for next non empty bucket */ |
2030 | while (++st->bucket < tcp_hashinfo.ehash_size && | |
2031 | empty_bucket(st)) | |
2032 | ; | |
2033 | if (st->bucket >= tcp_hashinfo.ehash_size) | |
2034 | return NULL; | |
2035 | ||
2036 | read_lock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); | |
3ab5aee7 | 2037 | sk = sk_nulls_head(&tcp_hashinfo.ehash[st->bucket].chain); |
1da177e4 | 2038 | } else |
3ab5aee7 | 2039 | sk = sk_nulls_next(sk); |
1da177e4 | 2040 | |
3ab5aee7 | 2041 | sk_nulls_for_each_from(sk, node) { |
878628fb | 2042 | if (sk->sk_family == st->family && net_eq(sock_net(sk), net)) |
1da177e4 LT |
2043 | goto found; |
2044 | } | |
2045 | ||
2046 | st->state = TCP_SEQ_STATE_TIME_WAIT; | |
dbca9b27 | 2047 | tw = tw_head(&tcp_hashinfo.ehash[st->bucket].twchain); |
1da177e4 LT |
2048 | goto get_tw; |
2049 | found: | |
2050 | cur = sk; | |
2051 | out: | |
2052 | return cur; | |
2053 | } | |
2054 | ||
2055 | static void *established_get_idx(struct seq_file *seq, loff_t pos) | |
2056 | { | |
2057 | void *rc = established_get_first(seq); | |
2058 | ||
2059 | while (rc && pos) { | |
2060 | rc = established_get_next(seq, rc); | |
2061 | --pos; | |
7174259e | 2062 | } |
1da177e4 LT |
2063 | return rc; |
2064 | } | |
2065 | ||
2066 | static void *tcp_get_idx(struct seq_file *seq, loff_t pos) | |
2067 | { | |
2068 | void *rc; | |
5799de0b | 2069 | struct tcp_iter_state *st = seq->private; |
1da177e4 | 2070 | |
1da177e4 LT |
2071 | st->state = TCP_SEQ_STATE_LISTENING; |
2072 | rc = listening_get_idx(seq, &pos); | |
2073 | ||
2074 | if (!rc) { | |
1da177e4 LT |
2075 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
2076 | rc = established_get_idx(seq, pos); | |
2077 | } | |
2078 | ||
2079 | return rc; | |
2080 | } | |
2081 | ||
2082 | static void *tcp_seq_start(struct seq_file *seq, loff_t *pos) | |
2083 | { | |
5799de0b | 2084 | struct tcp_iter_state *st = seq->private; |
1da177e4 LT |
2085 | st->state = TCP_SEQ_STATE_LISTENING; |
2086 | st->num = 0; | |
2087 | return *pos ? tcp_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
2088 | } | |
2089 | ||
2090 | static void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2091 | { | |
2092 | void *rc = NULL; | |
5799de0b | 2093 | struct tcp_iter_state *st; |
1da177e4 LT |
2094 | |
2095 | if (v == SEQ_START_TOKEN) { | |
2096 | rc = tcp_get_idx(seq, 0); | |
2097 | goto out; | |
2098 | } | |
2099 | st = seq->private; | |
2100 | ||
2101 | switch (st->state) { | |
2102 | case TCP_SEQ_STATE_OPENREQ: | |
2103 | case TCP_SEQ_STATE_LISTENING: | |
2104 | rc = listening_get_next(seq, v); | |
2105 | if (!rc) { | |
1da177e4 LT |
2106 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
2107 | rc = established_get_first(seq); | |
2108 | } | |
2109 | break; | |
2110 | case TCP_SEQ_STATE_ESTABLISHED: | |
2111 | case TCP_SEQ_STATE_TIME_WAIT: | |
2112 | rc = established_get_next(seq, v); | |
2113 | break; | |
2114 | } | |
2115 | out: | |
2116 | ++*pos; | |
2117 | return rc; | |
2118 | } | |
2119 | ||
2120 | static void tcp_seq_stop(struct seq_file *seq, void *v) | |
2121 | { | |
5799de0b | 2122 | struct tcp_iter_state *st = seq->private; |
1da177e4 LT |
2123 | |
2124 | switch (st->state) { | |
2125 | case TCP_SEQ_STATE_OPENREQ: | |
2126 | if (v) { | |
463c84b9 ACM |
2127 | struct inet_connection_sock *icsk = inet_csk(st->syn_wait_sk); |
2128 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); | |
1da177e4 LT |
2129 | } |
2130 | case TCP_SEQ_STATE_LISTENING: | |
2131 | if (v != SEQ_START_TOKEN) | |
5caea4ea | 2132 | spin_unlock_bh(&tcp_hashinfo.listening_hash[st->bucket].lock); |
1da177e4 LT |
2133 | break; |
2134 | case TCP_SEQ_STATE_TIME_WAIT: | |
2135 | case TCP_SEQ_STATE_ESTABLISHED: | |
2136 | if (v) | |
230140cf | 2137 | read_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
1da177e4 LT |
2138 | break; |
2139 | } | |
2140 | } | |
2141 | ||
2142 | static int tcp_seq_open(struct inode *inode, struct file *file) | |
2143 | { | |
2144 | struct tcp_seq_afinfo *afinfo = PDE(inode)->data; | |
1da177e4 | 2145 | struct tcp_iter_state *s; |
52d6f3f1 | 2146 | int err; |
1da177e4 | 2147 | |
52d6f3f1 DL |
2148 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
2149 | sizeof(struct tcp_iter_state)); | |
2150 | if (err < 0) | |
2151 | return err; | |
f40c8174 | 2152 | |
52d6f3f1 | 2153 | s = ((struct seq_file *)file->private_data)->private; |
1da177e4 | 2154 | s->family = afinfo->family; |
f40c8174 DL |
2155 | return 0; |
2156 | } | |
2157 | ||
6f8b13bc | 2158 | int tcp_proc_register(struct net *net, struct tcp_seq_afinfo *afinfo) |
1da177e4 LT |
2159 | { |
2160 | int rc = 0; | |
2161 | struct proc_dir_entry *p; | |
2162 | ||
68fcadd1 DL |
2163 | afinfo->seq_fops.open = tcp_seq_open; |
2164 | afinfo->seq_fops.read = seq_read; | |
2165 | afinfo->seq_fops.llseek = seq_lseek; | |
2166 | afinfo->seq_fops.release = seq_release_net; | |
7174259e | 2167 | |
9427c4b3 DL |
2168 | afinfo->seq_ops.start = tcp_seq_start; |
2169 | afinfo->seq_ops.next = tcp_seq_next; | |
2170 | afinfo->seq_ops.stop = tcp_seq_stop; | |
2171 | ||
84841c3c DL |
2172 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
2173 | &afinfo->seq_fops, afinfo); | |
2174 | if (!p) | |
1da177e4 LT |
2175 | rc = -ENOMEM; |
2176 | return rc; | |
2177 | } | |
2178 | ||
6f8b13bc | 2179 | void tcp_proc_unregister(struct net *net, struct tcp_seq_afinfo *afinfo) |
1da177e4 | 2180 | { |
6f8b13bc | 2181 | proc_net_remove(net, afinfo->name); |
1da177e4 LT |
2182 | } |
2183 | ||
60236fdd | 2184 | static void get_openreq4(struct sock *sk, struct request_sock *req, |
5e659e4c | 2185 | struct seq_file *f, int i, int uid, int *len) |
1da177e4 | 2186 | { |
2e6599cb | 2187 | const struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 LT |
2188 | int ttd = req->expires - jiffies; |
2189 | ||
5e659e4c PE |
2190 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
2191 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %u %d %p%n", | |
1da177e4 | 2192 | i, |
2e6599cb | 2193 | ireq->loc_addr, |
1da177e4 | 2194 | ntohs(inet_sk(sk)->sport), |
2e6599cb ACM |
2195 | ireq->rmt_addr, |
2196 | ntohs(ireq->rmt_port), | |
1da177e4 LT |
2197 | TCP_SYN_RECV, |
2198 | 0, 0, /* could print option size, but that is af dependent. */ | |
2199 | 1, /* timers active (only the expire timer) */ | |
2200 | jiffies_to_clock_t(ttd), | |
2201 | req->retrans, | |
2202 | uid, | |
2203 | 0, /* non standard timer */ | |
2204 | 0, /* open_requests have no inode */ | |
2205 | atomic_read(&sk->sk_refcnt), | |
5e659e4c PE |
2206 | req, |
2207 | len); | |
1da177e4 LT |
2208 | } |
2209 | ||
5e659e4c | 2210 | static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i, int *len) |
1da177e4 LT |
2211 | { |
2212 | int timer_active; | |
2213 | unsigned long timer_expires; | |
cf4c6bf8 IJ |
2214 | struct tcp_sock *tp = tcp_sk(sk); |
2215 | const struct inet_connection_sock *icsk = inet_csk(sk); | |
2216 | struct inet_sock *inet = inet_sk(sk); | |
714e85be AV |
2217 | __be32 dest = inet->daddr; |
2218 | __be32 src = inet->rcv_saddr; | |
1da177e4 LT |
2219 | __u16 destp = ntohs(inet->dport); |
2220 | __u16 srcp = ntohs(inet->sport); | |
2221 | ||
463c84b9 | 2222 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
1da177e4 | 2223 | timer_active = 1; |
463c84b9 ACM |
2224 | timer_expires = icsk->icsk_timeout; |
2225 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 2226 | timer_active = 4; |
463c84b9 | 2227 | timer_expires = icsk->icsk_timeout; |
cf4c6bf8 | 2228 | } else if (timer_pending(&sk->sk_timer)) { |
1da177e4 | 2229 | timer_active = 2; |
cf4c6bf8 | 2230 | timer_expires = sk->sk_timer.expires; |
1da177e4 LT |
2231 | } else { |
2232 | timer_active = 0; | |
2233 | timer_expires = jiffies; | |
2234 | } | |
2235 | ||
5e659e4c | 2236 | seq_printf(f, "%4d: %08X:%04X %08X:%04X %02X %08X:%08X %02X:%08lX " |
7be87351 | 2237 | "%08X %5d %8d %lu %d %p %lu %lu %u %u %d%n", |
cf4c6bf8 | 2238 | i, src, srcp, dest, destp, sk->sk_state, |
47da8ee6 | 2239 | tp->write_seq - tp->snd_una, |
cf4c6bf8 | 2240 | sk->sk_state == TCP_LISTEN ? sk->sk_ack_backlog : |
7174259e | 2241 | (tp->rcv_nxt - tp->copied_seq), |
1da177e4 LT |
2242 | timer_active, |
2243 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 2244 | icsk->icsk_retransmits, |
cf4c6bf8 | 2245 | sock_i_uid(sk), |
6687e988 | 2246 | icsk->icsk_probes_out, |
cf4c6bf8 IJ |
2247 | sock_i_ino(sk), |
2248 | atomic_read(&sk->sk_refcnt), sk, | |
7be87351 SH |
2249 | jiffies_to_clock_t(icsk->icsk_rto), |
2250 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 2251 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
1da177e4 | 2252 | tp->snd_cwnd, |
5e659e4c PE |
2253 | tp->snd_ssthresh >= 0xFFFF ? -1 : tp->snd_ssthresh, |
2254 | len); | |
1da177e4 LT |
2255 | } |
2256 | ||
7174259e | 2257 | static void get_timewait4_sock(struct inet_timewait_sock *tw, |
5e659e4c | 2258 | struct seq_file *f, int i, int *len) |
1da177e4 | 2259 | { |
23f33c2d | 2260 | __be32 dest, src; |
1da177e4 LT |
2261 | __u16 destp, srcp; |
2262 | int ttd = tw->tw_ttd - jiffies; | |
2263 | ||
2264 | if (ttd < 0) | |
2265 | ttd = 0; | |
2266 | ||
2267 | dest = tw->tw_daddr; | |
2268 | src = tw->tw_rcv_saddr; | |
2269 | destp = ntohs(tw->tw_dport); | |
2270 | srcp = ntohs(tw->tw_sport); | |
2271 | ||
5e659e4c PE |
2272 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
2273 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p%n", | |
1da177e4 LT |
2274 | i, src, srcp, dest, destp, tw->tw_substate, 0, 0, |
2275 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
5e659e4c | 2276 | atomic_read(&tw->tw_refcnt), tw, len); |
1da177e4 LT |
2277 | } |
2278 | ||
2279 | #define TMPSZ 150 | |
2280 | ||
2281 | static int tcp4_seq_show(struct seq_file *seq, void *v) | |
2282 | { | |
5799de0b | 2283 | struct tcp_iter_state *st; |
5e659e4c | 2284 | int len; |
1da177e4 LT |
2285 | |
2286 | if (v == SEQ_START_TOKEN) { | |
2287 | seq_printf(seq, "%-*s\n", TMPSZ - 1, | |
2288 | " sl local_address rem_address st tx_queue " | |
2289 | "rx_queue tr tm->when retrnsmt uid timeout " | |
2290 | "inode"); | |
2291 | goto out; | |
2292 | } | |
2293 | st = seq->private; | |
2294 | ||
2295 | switch (st->state) { | |
2296 | case TCP_SEQ_STATE_LISTENING: | |
2297 | case TCP_SEQ_STATE_ESTABLISHED: | |
5e659e4c | 2298 | get_tcp4_sock(v, seq, st->num, &len); |
1da177e4 LT |
2299 | break; |
2300 | case TCP_SEQ_STATE_OPENREQ: | |
5e659e4c | 2301 | get_openreq4(st->syn_wait_sk, v, seq, st->num, st->uid, &len); |
1da177e4 LT |
2302 | break; |
2303 | case TCP_SEQ_STATE_TIME_WAIT: | |
5e659e4c | 2304 | get_timewait4_sock(v, seq, st->num, &len); |
1da177e4 LT |
2305 | break; |
2306 | } | |
5e659e4c | 2307 | seq_printf(seq, "%*s\n", TMPSZ - 1 - len, ""); |
1da177e4 LT |
2308 | out: |
2309 | return 0; | |
2310 | } | |
2311 | ||
1da177e4 | 2312 | static struct tcp_seq_afinfo tcp4_seq_afinfo = { |
1da177e4 LT |
2313 | .name = "tcp", |
2314 | .family = AF_INET, | |
5f4472c5 DL |
2315 | .seq_fops = { |
2316 | .owner = THIS_MODULE, | |
2317 | }, | |
9427c4b3 DL |
2318 | .seq_ops = { |
2319 | .show = tcp4_seq_show, | |
2320 | }, | |
1da177e4 LT |
2321 | }; |
2322 | ||
757764f6 PE |
2323 | static int tcp4_proc_init_net(struct net *net) |
2324 | { | |
2325 | return tcp_proc_register(net, &tcp4_seq_afinfo); | |
2326 | } | |
2327 | ||
2328 | static void tcp4_proc_exit_net(struct net *net) | |
2329 | { | |
2330 | tcp_proc_unregister(net, &tcp4_seq_afinfo); | |
2331 | } | |
2332 | ||
2333 | static struct pernet_operations tcp4_net_ops = { | |
2334 | .init = tcp4_proc_init_net, | |
2335 | .exit = tcp4_proc_exit_net, | |
2336 | }; | |
2337 | ||
1da177e4 LT |
2338 | int __init tcp4_proc_init(void) |
2339 | { | |
757764f6 | 2340 | return register_pernet_subsys(&tcp4_net_ops); |
1da177e4 LT |
2341 | } |
2342 | ||
2343 | void tcp4_proc_exit(void) | |
2344 | { | |
757764f6 | 2345 | unregister_pernet_subsys(&tcp4_net_ops); |
1da177e4 LT |
2346 | } |
2347 | #endif /* CONFIG_PROC_FS */ | |
2348 | ||
2349 | struct proto tcp_prot = { | |
2350 | .name = "TCP", | |
2351 | .owner = THIS_MODULE, | |
2352 | .close = tcp_close, | |
2353 | .connect = tcp_v4_connect, | |
2354 | .disconnect = tcp_disconnect, | |
463c84b9 | 2355 | .accept = inet_csk_accept, |
1da177e4 LT |
2356 | .ioctl = tcp_ioctl, |
2357 | .init = tcp_v4_init_sock, | |
2358 | .destroy = tcp_v4_destroy_sock, | |
2359 | .shutdown = tcp_shutdown, | |
2360 | .setsockopt = tcp_setsockopt, | |
2361 | .getsockopt = tcp_getsockopt, | |
1da177e4 LT |
2362 | .recvmsg = tcp_recvmsg, |
2363 | .backlog_rcv = tcp_v4_do_rcv, | |
ab1e0a13 ACM |
2364 | .hash = inet_hash, |
2365 | .unhash = inet_unhash, | |
2366 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2367 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2368 | .sockets_allocated = &tcp_sockets_allocated, | |
0a5578cf | 2369 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2370 | .memory_allocated = &tcp_memory_allocated, |
2371 | .memory_pressure = &tcp_memory_pressure, | |
2372 | .sysctl_mem = sysctl_tcp_mem, | |
2373 | .sysctl_wmem = sysctl_tcp_wmem, | |
2374 | .sysctl_rmem = sysctl_tcp_rmem, | |
2375 | .max_header = MAX_TCP_HEADER, | |
2376 | .obj_size = sizeof(struct tcp_sock), | |
3ab5aee7 | 2377 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 2378 | .twsk_prot = &tcp_timewait_sock_ops, |
60236fdd | 2379 | .rsk_prot = &tcp_request_sock_ops, |
39d8cda7 | 2380 | .h.hashinfo = &tcp_hashinfo, |
543d9cfe ACM |
2381 | #ifdef CONFIG_COMPAT |
2382 | .compat_setsockopt = compat_tcp_setsockopt, | |
2383 | .compat_getsockopt = compat_tcp_getsockopt, | |
2384 | #endif | |
1da177e4 LT |
2385 | }; |
2386 | ||
046ee902 DL |
2387 | |
2388 | static int __net_init tcp_sk_init(struct net *net) | |
2389 | { | |
2390 | return inet_ctl_sock_create(&net->ipv4.tcp_sock, | |
2391 | PF_INET, SOCK_RAW, IPPROTO_TCP, net); | |
2392 | } | |
2393 | ||
2394 | static void __net_exit tcp_sk_exit(struct net *net) | |
2395 | { | |
2396 | inet_ctl_sock_destroy(net->ipv4.tcp_sock); | |
d315492b | 2397 | inet_twsk_purge(net, &tcp_hashinfo, &tcp_death_row, AF_INET); |
046ee902 DL |
2398 | } |
2399 | ||
2400 | static struct pernet_operations __net_initdata tcp_sk_ops = { | |
2401 | .init = tcp_sk_init, | |
2402 | .exit = tcp_sk_exit, | |
2403 | }; | |
2404 | ||
9b0f976f | 2405 | void __init tcp_v4_init(void) |
1da177e4 | 2406 | { |
5caea4ea | 2407 | inet_hashinfo_init(&tcp_hashinfo); |
046ee902 | 2408 | if (register_pernet_device(&tcp_sk_ops)) |
1da177e4 | 2409 | panic("Failed to create the TCP control socket.\n"); |
1da177e4 LT |
2410 | } |
2411 | ||
2412 | EXPORT_SYMBOL(ipv4_specific); | |
1da177e4 | 2413 | EXPORT_SYMBOL(tcp_hashinfo); |
1da177e4 | 2414 | EXPORT_SYMBOL(tcp_prot); |
1da177e4 LT |
2415 | EXPORT_SYMBOL(tcp_v4_conn_request); |
2416 | EXPORT_SYMBOL(tcp_v4_connect); | |
2417 | EXPORT_SYMBOL(tcp_v4_do_rcv); | |
1da177e4 LT |
2418 | EXPORT_SYMBOL(tcp_v4_remember_stamp); |
2419 | EXPORT_SYMBOL(tcp_v4_send_check); | |
2420 | EXPORT_SYMBOL(tcp_v4_syn_recv_sock); | |
2421 | ||
2422 | #ifdef CONFIG_PROC_FS | |
2423 | EXPORT_SYMBOL(tcp_proc_register); | |
2424 | EXPORT_SYMBOL(tcp_proc_unregister); | |
2425 | #endif | |
1da177e4 | 2426 | EXPORT_SYMBOL(sysctl_tcp_low_latency); |
1da177e4 | 2427 |