Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * TCP over IPv6 | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
6 | * Pedro Roque <roque@di.fc.ul.pt> | |
7 | * | |
8 | * $Id: tcp_ipv6.c,v 1.144 2002/02/01 22:01:04 davem Exp $ | |
9 | * | |
10 | * Based on: | |
11 | * linux/net/ipv4/tcp.c | |
12 | * linux/net/ipv4/tcp_input.c | |
13 | * linux/net/ipv4/tcp_output.c | |
14 | * | |
15 | * Fixes: | |
16 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
17 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
18 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
19 | * a single port at the same time. | |
20 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file. | |
21 | * | |
22 | * This program is free software; you can redistribute it and/or | |
23 | * modify it under the terms of the GNU General Public License | |
24 | * as published by the Free Software Foundation; either version | |
25 | * 2 of the License, or (at your option) any later version. | |
26 | */ | |
27 | ||
28 | #include <linux/module.h> | |
29 | #include <linux/config.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/socket.h> | |
33 | #include <linux/sockios.h> | |
34 | #include <linux/net.h> | |
35 | #include <linux/jiffies.h> | |
36 | #include <linux/in.h> | |
37 | #include <linux/in6.h> | |
38 | #include <linux/netdevice.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/jhash.h> | |
41 | #include <linux/ipsec.h> | |
42 | #include <linux/times.h> | |
43 | ||
44 | #include <linux/ipv6.h> | |
45 | #include <linux/icmpv6.h> | |
46 | #include <linux/random.h> | |
47 | ||
48 | #include <net/tcp.h> | |
49 | #include <net/ndisc.h> | |
5324a040 | 50 | #include <net/inet6_hashtables.h> |
1da177e4 LT |
51 | #include <net/ipv6.h> |
52 | #include <net/transp_v6.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/ip6_route.h> | |
55 | #include <net/ip6_checksum.h> | |
56 | #include <net/inet_ecn.h> | |
57 | #include <net/protocol.h> | |
58 | #include <net/xfrm.h> | |
59 | #include <net/addrconf.h> | |
60 | #include <net/snmp.h> | |
61 | #include <net/dsfield.h> | |
62 | ||
63 | #include <asm/uaccess.h> | |
64 | ||
65 | #include <linux/proc_fs.h> | |
66 | #include <linux/seq_file.h> | |
67 | ||
68 | static void tcp_v6_send_reset(struct sk_buff *skb); | |
60236fdd | 69 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req); |
1da177e4 LT |
70 | static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len, |
71 | struct sk_buff *skb); | |
72 | ||
73 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
74 | static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok); | |
75 | ||
76 | static struct tcp_func ipv6_mapped; | |
77 | static struct tcp_func ipv6_specific; | |
78 | ||
0f7ff927 ACM |
79 | static inline int tcp_v6_bind_conflict(const struct sock *sk, |
80 | const struct inet_bind_bucket *tb) | |
1da177e4 | 81 | { |
0f7ff927 ACM |
82 | const struct sock *sk2; |
83 | const struct hlist_node *node; | |
1da177e4 LT |
84 | |
85 | /* We must walk the whole port owner list in this case. -DaveM */ | |
86 | sk_for_each_bound(sk2, node, &tb->owners) { | |
87 | if (sk != sk2 && | |
88 | (!sk->sk_bound_dev_if || | |
89 | !sk2->sk_bound_dev_if || | |
90 | sk->sk_bound_dev_if == sk2->sk_bound_dev_if) && | |
91 | (!sk->sk_reuse || !sk2->sk_reuse || | |
92 | sk2->sk_state == TCP_LISTEN) && | |
93 | ipv6_rcv_saddr_equal(sk, sk2)) | |
94 | break; | |
95 | } | |
96 | ||
97 | return node != NULL; | |
98 | } | |
99 | ||
100 | /* Grrr, addr_type already calculated by caller, but I don't want | |
101 | * to add some silly "cookie" argument to this method just for that. | |
102 | * But it doesn't matter, the recalculation is in the rarest path | |
103 | * this function ever takes. | |
104 | */ | |
105 | static int tcp_v6_get_port(struct sock *sk, unsigned short snum) | |
106 | { | |
0f7ff927 ACM |
107 | struct inet_bind_hashbucket *head; |
108 | struct inet_bind_bucket *tb; | |
1da177e4 LT |
109 | struct hlist_node *node; |
110 | int ret; | |
111 | ||
112 | local_bh_disable(); | |
113 | if (snum == 0) { | |
114 | int low = sysctl_local_port_range[0]; | |
115 | int high = sysctl_local_port_range[1]; | |
116 | int remaining = (high - low) + 1; | |
117 | int rover; | |
118 | ||
6e04e021 ACM |
119 | spin_lock(&tcp_hashinfo.portalloc_lock); |
120 | if (tcp_hashinfo.port_rover < low) | |
c3924c70 FH |
121 | rover = low; |
122 | else | |
6e04e021 | 123 | rover = tcp_hashinfo.port_rover; |
1da177e4 | 124 | do { rover++; |
c3924c70 | 125 | if (rover > high) |
1da177e4 | 126 | rover = low; |
6e04e021 | 127 | head = &tcp_hashinfo.bhash[inet_bhashfn(rover, tcp_hashinfo.bhash_size)]; |
1da177e4 | 128 | spin_lock(&head->lock); |
0f7ff927 | 129 | inet_bind_bucket_for_each(tb, node, &head->chain) |
1da177e4 LT |
130 | if (tb->port == rover) |
131 | goto next; | |
132 | break; | |
133 | next: | |
134 | spin_unlock(&head->lock); | |
135 | } while (--remaining > 0); | |
6e04e021 ACM |
136 | tcp_hashinfo.port_rover = rover; |
137 | spin_unlock(&tcp_hashinfo.portalloc_lock); | |
1da177e4 | 138 | |
d5d28375 DM |
139 | /* Exhausted local port range during search? It is not |
140 | * possible for us to be holding one of the bind hash | |
141 | * locks if this test triggers, because if 'remaining' | |
142 | * drops to zero, we broke out of the do/while loop at | |
143 | * the top level, not from the 'break;' statement. | |
144 | */ | |
1da177e4 | 145 | ret = 1; |
d5d28375 | 146 | if (unlikely(remaining <= 0)) |
1da177e4 LT |
147 | goto fail; |
148 | ||
149 | /* OK, here is the one we will use. */ | |
150 | snum = rover; | |
151 | } else { | |
6e04e021 | 152 | head = &tcp_hashinfo.bhash[inet_bhashfn(snum, tcp_hashinfo.bhash_size)]; |
1da177e4 | 153 | spin_lock(&head->lock); |
0f7ff927 | 154 | inet_bind_bucket_for_each(tb, node, &head->chain) |
1da177e4 LT |
155 | if (tb->port == snum) |
156 | goto tb_found; | |
157 | } | |
158 | tb = NULL; | |
159 | goto tb_not_found; | |
160 | tb_found: | |
161 | if (tb && !hlist_empty(&tb->owners)) { | |
162 | if (tb->fastreuse > 0 && sk->sk_reuse && | |
163 | sk->sk_state != TCP_LISTEN) { | |
164 | goto success; | |
165 | } else { | |
166 | ret = 1; | |
167 | if (tcp_v6_bind_conflict(sk, tb)) | |
168 | goto fail_unlock; | |
169 | } | |
170 | } | |
171 | tb_not_found: | |
172 | ret = 1; | |
6e04e021 ACM |
173 | if (tb == NULL) { |
174 | tb = inet_bind_bucket_create(tcp_hashinfo.bind_bucket_cachep, head, snum); | |
175 | if (tb == NULL) | |
176 | goto fail_unlock; | |
177 | } | |
1da177e4 LT |
178 | if (hlist_empty(&tb->owners)) { |
179 | if (sk->sk_reuse && sk->sk_state != TCP_LISTEN) | |
180 | tb->fastreuse = 1; | |
181 | else | |
182 | tb->fastreuse = 0; | |
183 | } else if (tb->fastreuse && | |
184 | (!sk->sk_reuse || sk->sk_state == TCP_LISTEN)) | |
185 | tb->fastreuse = 0; | |
186 | ||
187 | success: | |
463c84b9 | 188 | if (!inet_csk(sk)->icsk_bind_hash) |
2d8c4ce5 | 189 | inet_bind_hash(sk, tb, snum); |
463c84b9 | 190 | BUG_TRAP(inet_csk(sk)->icsk_bind_hash == tb); |
1da177e4 LT |
191 | ret = 0; |
192 | ||
193 | fail_unlock: | |
194 | spin_unlock(&head->lock); | |
195 | fail: | |
196 | local_bh_enable(); | |
197 | return ret; | |
198 | } | |
199 | ||
200 | static __inline__ void __tcp_v6_hash(struct sock *sk) | |
201 | { | |
202 | struct hlist_head *list; | |
203 | rwlock_t *lock; | |
204 | ||
205 | BUG_TRAP(sk_unhashed(sk)); | |
206 | ||
207 | if (sk->sk_state == TCP_LISTEN) { | |
6e04e021 ACM |
208 | list = &tcp_hashinfo.listening_hash[inet_sk_listen_hashfn(sk)]; |
209 | lock = &tcp_hashinfo.lhash_lock; | |
f3f05f70 | 210 | inet_listen_wlock(&tcp_hashinfo); |
1da177e4 | 211 | } else { |
505cbfc5 | 212 | sk->sk_hashent = inet6_sk_ehashfn(sk, tcp_hashinfo.ehash_size); |
6e04e021 ACM |
213 | list = &tcp_hashinfo.ehash[sk->sk_hashent].chain; |
214 | lock = &tcp_hashinfo.ehash[sk->sk_hashent].lock; | |
1da177e4 LT |
215 | write_lock(lock); |
216 | } | |
217 | ||
218 | __sk_add_node(sk, list); | |
219 | sock_prot_inc_use(sk->sk_prot); | |
220 | write_unlock(lock); | |
221 | } | |
222 | ||
223 | ||
224 | static void tcp_v6_hash(struct sock *sk) | |
225 | { | |
226 | if (sk->sk_state != TCP_CLOSE) { | |
227 | struct tcp_sock *tp = tcp_sk(sk); | |
228 | ||
229 | if (tp->af_specific == &ipv6_mapped) { | |
230 | tcp_prot.hash(sk); | |
231 | return; | |
232 | } | |
233 | local_bh_disable(); | |
234 | __tcp_v6_hash(sk); | |
235 | local_bh_enable(); | |
236 | } | |
237 | } | |
238 | ||
1da177e4 LT |
239 | /* |
240 | * Open request hash tables. | |
241 | */ | |
242 | ||
463c84b9 | 243 | static u32 tcp_v6_synq_hash(const struct in6_addr *raddr, const u16 rport, const u32 rnd) |
1da177e4 LT |
244 | { |
245 | u32 a, b, c; | |
246 | ||
247 | a = raddr->s6_addr32[0]; | |
248 | b = raddr->s6_addr32[1]; | |
249 | c = raddr->s6_addr32[2]; | |
250 | ||
251 | a += JHASH_GOLDEN_RATIO; | |
252 | b += JHASH_GOLDEN_RATIO; | |
253 | c += rnd; | |
254 | __jhash_mix(a, b, c); | |
255 | ||
256 | a += raddr->s6_addr32[3]; | |
257 | b += (u32) rport; | |
258 | __jhash_mix(a, b, c); | |
259 | ||
260 | return c & (TCP_SYNQ_HSIZE - 1); | |
261 | } | |
262 | ||
463c84b9 | 263 | static struct request_sock *tcp_v6_search_req(const struct sock *sk, |
60236fdd | 264 | struct request_sock ***prevp, |
1da177e4 LT |
265 | __u16 rport, |
266 | struct in6_addr *raddr, | |
267 | struct in6_addr *laddr, | |
268 | int iif) | |
269 | { | |
463c84b9 ACM |
270 | const struct inet_connection_sock *icsk = inet_csk(sk); |
271 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
60236fdd | 272 | struct request_sock *req, **prev; |
1da177e4 LT |
273 | |
274 | for (prev = &lopt->syn_table[tcp_v6_synq_hash(raddr, rport, lopt->hash_rnd)]; | |
275 | (req = *prev) != NULL; | |
276 | prev = &req->dl_next) { | |
2e6599cb ACM |
277 | const struct tcp6_request_sock *treq = tcp6_rsk(req); |
278 | ||
279 | if (inet_rsk(req)->rmt_port == rport && | |
60236fdd | 280 | req->rsk_ops->family == AF_INET6 && |
2e6599cb ACM |
281 | ipv6_addr_equal(&treq->rmt_addr, raddr) && |
282 | ipv6_addr_equal(&treq->loc_addr, laddr) && | |
283 | (!treq->iif || treq->iif == iif)) { | |
1da177e4 LT |
284 | BUG_TRAP(req->sk == NULL); |
285 | *prevp = prev; | |
286 | return req; | |
287 | } | |
288 | } | |
289 | ||
290 | return NULL; | |
291 | } | |
292 | ||
293 | static __inline__ u16 tcp_v6_check(struct tcphdr *th, int len, | |
294 | struct in6_addr *saddr, | |
295 | struct in6_addr *daddr, | |
296 | unsigned long base) | |
297 | { | |
298 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
299 | } | |
300 | ||
301 | static __u32 tcp_v6_init_sequence(struct sock *sk, struct sk_buff *skb) | |
302 | { | |
303 | if (skb->protocol == htons(ETH_P_IPV6)) { | |
304 | return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32, | |
305 | skb->nh.ipv6h->saddr.s6_addr32, | |
306 | skb->h.th->dest, | |
307 | skb->h.th->source); | |
308 | } else { | |
309 | return secure_tcp_sequence_number(skb->nh.iph->daddr, | |
310 | skb->nh.iph->saddr, | |
311 | skb->h.th->dest, | |
312 | skb->h.th->source); | |
313 | } | |
314 | } | |
315 | ||
505cbfc5 | 316 | static int __tcp_v6_check_established(struct sock *sk, const __u16 lport, |
8feaf0c0 | 317 | struct inet_timewait_sock **twp) |
1da177e4 LT |
318 | { |
319 | struct inet_sock *inet = inet_sk(sk); | |
505cbfc5 ACM |
320 | const struct ipv6_pinfo *np = inet6_sk(sk); |
321 | const struct in6_addr *daddr = &np->rcv_saddr; | |
322 | const struct in6_addr *saddr = &np->daddr; | |
323 | const int dif = sk->sk_bound_dev_if; | |
8feaf0c0 | 324 | const u32 ports = INET_COMBINED_PORTS(inet->dport, lport); |
505cbfc5 ACM |
325 | const int hash = inet6_ehashfn(daddr, inet->num, saddr, inet->dport, |
326 | tcp_hashinfo.ehash_size); | |
6e04e021 | 327 | struct inet_ehash_bucket *head = &tcp_hashinfo.ehash[hash]; |
1da177e4 | 328 | struct sock *sk2; |
8feaf0c0 ACM |
329 | const struct hlist_node *node; |
330 | struct inet_timewait_sock *tw; | |
1da177e4 LT |
331 | |
332 | write_lock(&head->lock); | |
333 | ||
334 | /* Check TIME-WAIT sockets first. */ | |
6e04e021 | 335 | sk_for_each(sk2, node, &(head + tcp_hashinfo.ehash_size)->chain) { |
8feaf0c0 ACM |
336 | const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk2); |
337 | ||
338 | tw = inet_twsk(sk2); | |
1da177e4 LT |
339 | |
340 | if(*((__u32 *)&(tw->tw_dport)) == ports && | |
341 | sk2->sk_family == PF_INET6 && | |
8feaf0c0 ACM |
342 | ipv6_addr_equal(&tcp6tw->tw_v6_daddr, saddr) && |
343 | ipv6_addr_equal(&tcp6tw->tw_v6_rcv_saddr, daddr) && | |
1da177e4 | 344 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) { |
8feaf0c0 | 345 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sk2); |
1da177e4 LT |
346 | struct tcp_sock *tp = tcp_sk(sk); |
347 | ||
8feaf0c0 ACM |
348 | if (tcptw->tw_ts_recent_stamp && |
349 | (!twp || | |
350 | (sysctl_tcp_tw_reuse && | |
351 | xtime.tv_sec - tcptw->tw_ts_recent_stamp > 1))) { | |
1da177e4 | 352 | /* See comment in tcp_ipv4.c */ |
8feaf0c0 | 353 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; |
1da177e4 LT |
354 | if (!tp->write_seq) |
355 | tp->write_seq = 1; | |
8feaf0c0 ACM |
356 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; |
357 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; | |
1da177e4 LT |
358 | sock_hold(sk2); |
359 | goto unique; | |
360 | } else | |
361 | goto not_unique; | |
362 | } | |
363 | } | |
364 | tw = NULL; | |
365 | ||
366 | /* And established part... */ | |
367 | sk_for_each(sk2, node, &head->chain) { | |
8feaf0c0 | 368 | if (INET6_MATCH(sk2, saddr, daddr, ports, dif)) |
1da177e4 LT |
369 | goto not_unique; |
370 | } | |
371 | ||
372 | unique: | |
373 | BUG_TRAP(sk_unhashed(sk)); | |
374 | __sk_add_node(sk, &head->chain); | |
375 | sk->sk_hashent = hash; | |
376 | sock_prot_inc_use(sk->sk_prot); | |
377 | write_unlock(&head->lock); | |
378 | ||
379 | if (twp) { | |
380 | *twp = tw; | |
381 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); | |
382 | } else if (tw) { | |
383 | /* Silly. Should hash-dance instead... */ | |
295ff7ed | 384 | inet_twsk_deschedule(tw, &tcp_death_row); |
1da177e4 LT |
385 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); |
386 | ||
8feaf0c0 | 387 | inet_twsk_put(tw); |
1da177e4 LT |
388 | } |
389 | return 0; | |
390 | ||
391 | not_unique: | |
392 | write_unlock(&head->lock); | |
393 | return -EADDRNOTAVAIL; | |
394 | } | |
395 | ||
396 | static inline u32 tcpv6_port_offset(const struct sock *sk) | |
397 | { | |
398 | const struct inet_sock *inet = inet_sk(sk); | |
399 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
400 | ||
401 | return secure_tcpv6_port_ephemeral(np->rcv_saddr.s6_addr32, | |
402 | np->daddr.s6_addr32, | |
403 | inet->dport); | |
404 | } | |
405 | ||
406 | static int tcp_v6_hash_connect(struct sock *sk) | |
407 | { | |
408 | unsigned short snum = inet_sk(sk)->num; | |
0f7ff927 ACM |
409 | struct inet_bind_hashbucket *head; |
410 | struct inet_bind_bucket *tb; | |
1da177e4 LT |
411 | int ret; |
412 | ||
413 | if (!snum) { | |
414 | int low = sysctl_local_port_range[0]; | |
415 | int high = sysctl_local_port_range[1]; | |
416 | int range = high - low; | |
417 | int i; | |
418 | int port; | |
419 | static u32 hint; | |
420 | u32 offset = hint + tcpv6_port_offset(sk); | |
421 | struct hlist_node *node; | |
8feaf0c0 | 422 | struct inet_timewait_sock *tw = NULL; |
1da177e4 LT |
423 | |
424 | local_bh_disable(); | |
425 | for (i = 1; i <= range; i++) { | |
426 | port = low + (i + offset) % range; | |
6e04e021 | 427 | head = &tcp_hashinfo.bhash[inet_bhashfn(port, tcp_hashinfo.bhash_size)]; |
1da177e4 LT |
428 | spin_lock(&head->lock); |
429 | ||
430 | /* Does not bother with rcv_saddr checks, | |
431 | * because the established check is already | |
432 | * unique enough. | |
433 | */ | |
0f7ff927 | 434 | inet_bind_bucket_for_each(tb, node, &head->chain) { |
1da177e4 LT |
435 | if (tb->port == port) { |
436 | BUG_TRAP(!hlist_empty(&tb->owners)); | |
437 | if (tb->fastreuse >= 0) | |
438 | goto next_port; | |
439 | if (!__tcp_v6_check_established(sk, | |
440 | port, | |
441 | &tw)) | |
442 | goto ok; | |
443 | goto next_port; | |
444 | } | |
445 | } | |
446 | ||
6e04e021 | 447 | tb = inet_bind_bucket_create(tcp_hashinfo.bind_bucket_cachep, head, port); |
1da177e4 LT |
448 | if (!tb) { |
449 | spin_unlock(&head->lock); | |
450 | break; | |
451 | } | |
452 | tb->fastreuse = -1; | |
453 | goto ok; | |
454 | ||
455 | next_port: | |
456 | spin_unlock(&head->lock); | |
457 | } | |
458 | local_bh_enable(); | |
459 | ||
460 | return -EADDRNOTAVAIL; | |
461 | ||
462 | ok: | |
463 | hint += i; | |
464 | ||
465 | /* Head lock still held and bh's disabled */ | |
2d8c4ce5 | 466 | inet_bind_hash(sk, tb, port); |
1da177e4 LT |
467 | if (sk_unhashed(sk)) { |
468 | inet_sk(sk)->sport = htons(port); | |
469 | __tcp_v6_hash(sk); | |
470 | } | |
471 | spin_unlock(&head->lock); | |
472 | ||
473 | if (tw) { | |
295ff7ed | 474 | inet_twsk_deschedule(tw, &tcp_death_row); |
8feaf0c0 | 475 | inet_twsk_put(tw); |
1da177e4 LT |
476 | } |
477 | ||
478 | ret = 0; | |
479 | goto out; | |
480 | } | |
481 | ||
6e04e021 | 482 | head = &tcp_hashinfo.bhash[inet_bhashfn(snum, tcp_hashinfo.bhash_size)]; |
463c84b9 | 483 | tb = inet_csk(sk)->icsk_bind_hash; |
1da177e4 LT |
484 | spin_lock_bh(&head->lock); |
485 | ||
486 | if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) { | |
487 | __tcp_v6_hash(sk); | |
488 | spin_unlock_bh(&head->lock); | |
489 | return 0; | |
490 | } else { | |
491 | spin_unlock(&head->lock); | |
492 | /* No definite answer... Walk to established hash table */ | |
493 | ret = __tcp_v6_check_established(sk, snum, NULL); | |
494 | out: | |
495 | local_bh_enable(); | |
496 | return ret; | |
497 | } | |
498 | } | |
499 | ||
1da177e4 LT |
500 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
501 | int addr_len) | |
502 | { | |
503 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
504 | struct inet_sock *inet = inet_sk(sk); | |
505 | struct ipv6_pinfo *np = inet6_sk(sk); | |
506 | struct tcp_sock *tp = tcp_sk(sk); | |
507 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
508 | struct flowi fl; | |
509 | struct dst_entry *dst; | |
510 | int addr_type; | |
511 | int err; | |
512 | ||
513 | if (addr_len < SIN6_LEN_RFC2133) | |
514 | return -EINVAL; | |
515 | ||
516 | if (usin->sin6_family != AF_INET6) | |
517 | return(-EAFNOSUPPORT); | |
518 | ||
519 | memset(&fl, 0, sizeof(fl)); | |
520 | ||
521 | if (np->sndflow) { | |
522 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
523 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
524 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
525 | struct ip6_flowlabel *flowlabel; | |
526 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
527 | if (flowlabel == NULL) | |
528 | return -EINVAL; | |
529 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
530 | fl6_sock_release(flowlabel); | |
531 | } | |
532 | } | |
533 | ||
534 | /* | |
535 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
536 | */ | |
537 | ||
538 | if(ipv6_addr_any(&usin->sin6_addr)) | |
539 | usin->sin6_addr.s6_addr[15] = 0x1; | |
540 | ||
541 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
542 | ||
543 | if(addr_type & IPV6_ADDR_MULTICAST) | |
544 | return -ENETUNREACH; | |
545 | ||
546 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
547 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
548 | usin->sin6_scope_id) { | |
549 | /* If interface is set while binding, indices | |
550 | * must coincide. | |
551 | */ | |
552 | if (sk->sk_bound_dev_if && | |
553 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
554 | return -EINVAL; | |
555 | ||
556 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
557 | } | |
558 | ||
559 | /* Connect to link-local address requires an interface */ | |
560 | if (!sk->sk_bound_dev_if) | |
561 | return -EINVAL; | |
562 | } | |
563 | ||
564 | if (tp->rx_opt.ts_recent_stamp && | |
565 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
566 | tp->rx_opt.ts_recent = 0; | |
567 | tp->rx_opt.ts_recent_stamp = 0; | |
568 | tp->write_seq = 0; | |
569 | } | |
570 | ||
571 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
572 | np->flow_label = fl.fl6_flowlabel; | |
573 | ||
574 | /* | |
575 | * TCP over IPv4 | |
576 | */ | |
577 | ||
578 | if (addr_type == IPV6_ADDR_MAPPED) { | |
579 | u32 exthdrlen = tp->ext_header_len; | |
580 | struct sockaddr_in sin; | |
581 | ||
582 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
583 | ||
584 | if (__ipv6_only_sock(sk)) | |
585 | return -ENETUNREACH; | |
586 | ||
587 | sin.sin_family = AF_INET; | |
588 | sin.sin_port = usin->sin6_port; | |
589 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
590 | ||
591 | tp->af_specific = &ipv6_mapped; | |
592 | sk->sk_backlog_rcv = tcp_v4_do_rcv; | |
593 | ||
594 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
595 | ||
596 | if (err) { | |
597 | tp->ext_header_len = exthdrlen; | |
598 | tp->af_specific = &ipv6_specific; | |
599 | sk->sk_backlog_rcv = tcp_v6_do_rcv; | |
600 | goto failure; | |
601 | } else { | |
602 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
603 | inet->saddr); | |
604 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
605 | inet->rcv_saddr); | |
606 | } | |
607 | ||
608 | return err; | |
609 | } | |
610 | ||
611 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
612 | saddr = &np->rcv_saddr; | |
613 | ||
614 | fl.proto = IPPROTO_TCP; | |
615 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
616 | ipv6_addr_copy(&fl.fl6_src, | |
617 | (saddr ? saddr : &np->saddr)); | |
618 | fl.oif = sk->sk_bound_dev_if; | |
619 | fl.fl_ip_dport = usin->sin6_port; | |
620 | fl.fl_ip_sport = inet->sport; | |
621 | ||
622 | if (np->opt && np->opt->srcrt) { | |
623 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
624 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
625 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
626 | final_p = &final; | |
627 | } | |
628 | ||
629 | err = ip6_dst_lookup(sk, &dst, &fl); | |
630 | if (err) | |
631 | goto failure; | |
632 | if (final_p) | |
633 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
634 | ||
635 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
636 | dst_release(dst); | |
637 | goto failure; | |
638 | } | |
639 | ||
640 | if (saddr == NULL) { | |
641 | saddr = &fl.fl6_src; | |
642 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
643 | } | |
644 | ||
645 | /* set the source address */ | |
646 | ipv6_addr_copy(&np->saddr, saddr); | |
647 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
648 | ||
649 | ip6_dst_store(sk, dst, NULL); | |
650 | sk->sk_route_caps = dst->dev->features & | |
651 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
652 | ||
653 | tp->ext_header_len = 0; | |
654 | if (np->opt) | |
655 | tp->ext_header_len = np->opt->opt_flen + np->opt->opt_nflen; | |
656 | ||
657 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
658 | ||
659 | inet->dport = usin->sin6_port; | |
660 | ||
661 | tcp_set_state(sk, TCP_SYN_SENT); | |
662 | err = tcp_v6_hash_connect(sk); | |
663 | if (err) | |
664 | goto late_failure; | |
665 | ||
666 | if (!tp->write_seq) | |
667 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
668 | np->daddr.s6_addr32, | |
669 | inet->sport, | |
670 | inet->dport); | |
671 | ||
672 | err = tcp_connect(sk); | |
673 | if (err) | |
674 | goto late_failure; | |
675 | ||
676 | return 0; | |
677 | ||
678 | late_failure: | |
679 | tcp_set_state(sk, TCP_CLOSE); | |
680 | __sk_dst_reset(sk); | |
681 | failure: | |
682 | inet->dport = 0; | |
683 | sk->sk_route_caps = 0; | |
684 | return err; | |
685 | } | |
686 | ||
687 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
688 | int type, int code, int offset, __u32 info) | |
689 | { | |
690 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
505cbfc5 | 691 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
692 | struct ipv6_pinfo *np; |
693 | struct sock *sk; | |
694 | int err; | |
695 | struct tcp_sock *tp; | |
696 | __u32 seq; | |
697 | ||
505cbfc5 ACM |
698 | sk = inet6_lookup(&tcp_hashinfo, &hdr->daddr, th->dest, &hdr->saddr, |
699 | th->source, skb->dev->ifindex); | |
1da177e4 LT |
700 | |
701 | if (sk == NULL) { | |
702 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
703 | return; | |
704 | } | |
705 | ||
706 | if (sk->sk_state == TCP_TIME_WAIT) { | |
8feaf0c0 | 707 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
708 | return; |
709 | } | |
710 | ||
711 | bh_lock_sock(sk); | |
712 | if (sock_owned_by_user(sk)) | |
713 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
714 | ||
715 | if (sk->sk_state == TCP_CLOSE) | |
716 | goto out; | |
717 | ||
718 | tp = tcp_sk(sk); | |
719 | seq = ntohl(th->seq); | |
720 | if (sk->sk_state != TCP_LISTEN && | |
721 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
722 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
723 | goto out; | |
724 | } | |
725 | ||
726 | np = inet6_sk(sk); | |
727 | ||
728 | if (type == ICMPV6_PKT_TOOBIG) { | |
729 | struct dst_entry *dst = NULL; | |
730 | ||
731 | if (sock_owned_by_user(sk)) | |
732 | goto out; | |
733 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
734 | goto out; | |
735 | ||
736 | /* icmp should have updated the destination cache entry */ | |
737 | dst = __sk_dst_check(sk, np->dst_cookie); | |
738 | ||
739 | if (dst == NULL) { | |
740 | struct inet_sock *inet = inet_sk(sk); | |
741 | struct flowi fl; | |
742 | ||
743 | /* BUGGG_FUTURE: Again, it is not clear how | |
744 | to handle rthdr case. Ignore this complexity | |
745 | for now. | |
746 | */ | |
747 | memset(&fl, 0, sizeof(fl)); | |
748 | fl.proto = IPPROTO_TCP; | |
749 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
750 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
751 | fl.oif = sk->sk_bound_dev_if; | |
752 | fl.fl_ip_dport = inet->dport; | |
753 | fl.fl_ip_sport = inet->sport; | |
754 | ||
755 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
756 | sk->sk_err_soft = -err; | |
757 | goto out; | |
758 | } | |
759 | ||
760 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
761 | sk->sk_err_soft = -err; | |
762 | goto out; | |
763 | } | |
764 | ||
765 | } else | |
766 | dst_hold(dst); | |
767 | ||
768 | if (tp->pmtu_cookie > dst_mtu(dst)) { | |
769 | tcp_sync_mss(sk, dst_mtu(dst)); | |
770 | tcp_simple_retransmit(sk); | |
771 | } /* else let the usual retransmit timer handle it */ | |
772 | dst_release(dst); | |
773 | goto out; | |
774 | } | |
775 | ||
776 | icmpv6_err_convert(type, code, &err); | |
777 | ||
60236fdd | 778 | /* Might be for an request_sock */ |
1da177e4 | 779 | switch (sk->sk_state) { |
60236fdd | 780 | struct request_sock *req, **prev; |
1da177e4 LT |
781 | case TCP_LISTEN: |
782 | if (sock_owned_by_user(sk)) | |
783 | goto out; | |
784 | ||
463c84b9 | 785 | req = tcp_v6_search_req(sk, &prev, th->dest, &hdr->daddr, |
505cbfc5 | 786 | &hdr->saddr, inet6_iif(skb)); |
1da177e4 LT |
787 | if (!req) |
788 | goto out; | |
789 | ||
790 | /* ICMPs are not backlogged, hence we cannot get | |
791 | * an established socket here. | |
792 | */ | |
793 | BUG_TRAP(req->sk == NULL); | |
794 | ||
2e6599cb | 795 | if (seq != tcp_rsk(req)->snt_isn) { |
1da177e4 LT |
796 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
797 | goto out; | |
798 | } | |
799 | ||
463c84b9 | 800 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
801 | goto out; |
802 | ||
803 | case TCP_SYN_SENT: | |
804 | case TCP_SYN_RECV: /* Cannot happen. | |
805 | It can, it SYNs are crossed. --ANK */ | |
806 | if (!sock_owned_by_user(sk)) { | |
807 | TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS); | |
808 | sk->sk_err = err; | |
809 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
810 | ||
811 | tcp_done(sk); | |
812 | } else | |
813 | sk->sk_err_soft = err; | |
814 | goto out; | |
815 | } | |
816 | ||
817 | if (!sock_owned_by_user(sk) && np->recverr) { | |
818 | sk->sk_err = err; | |
819 | sk->sk_error_report(sk); | |
820 | } else | |
821 | sk->sk_err_soft = err; | |
822 | ||
823 | out: | |
824 | bh_unlock_sock(sk); | |
825 | sock_put(sk); | |
826 | } | |
827 | ||
828 | ||
60236fdd | 829 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, |
1da177e4 LT |
830 | struct dst_entry *dst) |
831 | { | |
2e6599cb | 832 | struct tcp6_request_sock *treq = tcp6_rsk(req); |
1da177e4 LT |
833 | struct ipv6_pinfo *np = inet6_sk(sk); |
834 | struct sk_buff * skb; | |
835 | struct ipv6_txoptions *opt = NULL; | |
836 | struct in6_addr * final_p = NULL, final; | |
837 | struct flowi fl; | |
838 | int err = -1; | |
839 | ||
840 | memset(&fl, 0, sizeof(fl)); | |
841 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
842 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
843 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 844 | fl.fl6_flowlabel = 0; |
2e6599cb ACM |
845 | fl.oif = treq->iif; |
846 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
1da177e4 LT |
847 | fl.fl_ip_sport = inet_sk(sk)->sport; |
848 | ||
849 | if (dst == NULL) { | |
850 | opt = np->opt; | |
851 | if (opt == NULL && | |
852 | np->rxopt.bits.srcrt == 2 && | |
2e6599cb ACM |
853 | treq->pktopts) { |
854 | struct sk_buff *pktopts = treq->pktopts; | |
1da177e4 LT |
855 | struct inet6_skb_parm *rxopt = IP6CB(pktopts); |
856 | if (rxopt->srcrt) | |
857 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr*)(pktopts->nh.raw + rxopt->srcrt)); | |
858 | } | |
859 | ||
860 | if (opt && opt->srcrt) { | |
861 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
862 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
863 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
864 | final_p = &final; | |
865 | } | |
866 | ||
867 | err = ip6_dst_lookup(sk, &dst, &fl); | |
868 | if (err) | |
869 | goto done; | |
870 | if (final_p) | |
871 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
872 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
873 | goto done; | |
874 | } | |
875 | ||
876 | skb = tcp_make_synack(sk, dst, req); | |
877 | if (skb) { | |
878 | struct tcphdr *th = skb->h.th; | |
879 | ||
880 | th->check = tcp_v6_check(th, skb->len, | |
2e6599cb | 881 | &treq->loc_addr, &treq->rmt_addr, |
1da177e4 LT |
882 | csum_partial((char *)th, skb->len, skb->csum)); |
883 | ||
2e6599cb | 884 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
885 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
886 | if (err == NET_XMIT_CN) | |
887 | err = 0; | |
888 | } | |
889 | ||
890 | done: | |
891 | dst_release(dst); | |
892 | if (opt && opt != np->opt) | |
893 | sock_kfree_s(sk, opt, opt->tot_len); | |
894 | return err; | |
895 | } | |
896 | ||
60236fdd | 897 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 898 | { |
2e6599cb ACM |
899 | if (tcp6_rsk(req)->pktopts) |
900 | kfree_skb(tcp6_rsk(req)->pktopts); | |
1da177e4 LT |
901 | } |
902 | ||
60236fdd | 903 | static struct request_sock_ops tcp6_request_sock_ops = { |
1da177e4 | 904 | .family = AF_INET6, |
2e6599cb | 905 | .obj_size = sizeof(struct tcp6_request_sock), |
1da177e4 | 906 | .rtx_syn_ack = tcp_v6_send_synack, |
60236fdd ACM |
907 | .send_ack = tcp_v6_reqsk_send_ack, |
908 | .destructor = tcp_v6_reqsk_destructor, | |
1da177e4 LT |
909 | .send_reset = tcp_v6_send_reset |
910 | }; | |
911 | ||
912 | static int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) | |
913 | { | |
914 | struct ipv6_pinfo *np = inet6_sk(sk); | |
915 | struct inet6_skb_parm *opt = IP6CB(skb); | |
916 | ||
917 | if (np->rxopt.all) { | |
918 | if ((opt->hop && np->rxopt.bits.hopopts) || | |
919 | ((IPV6_FLOWINFO_MASK&*(u32*)skb->nh.raw) && | |
920 | np->rxopt.bits.rxflow) || | |
921 | (opt->srcrt && np->rxopt.bits.srcrt) || | |
922 | ((opt->dst1 || opt->dst0) && np->rxopt.bits.dstopts)) | |
923 | return 1; | |
924 | } | |
925 | return 0; | |
926 | } | |
927 | ||
928 | ||
929 | static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len, | |
930 | struct sk_buff *skb) | |
931 | { | |
932 | struct ipv6_pinfo *np = inet6_sk(sk); | |
933 | ||
934 | if (skb->ip_summed == CHECKSUM_HW) { | |
935 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); | |
936 | skb->csum = offsetof(struct tcphdr, check); | |
937 | } else { | |
938 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, | |
939 | csum_partial((char *)th, th->doff<<2, | |
940 | skb->csum)); | |
941 | } | |
942 | } | |
943 | ||
944 | ||
945 | static void tcp_v6_send_reset(struct sk_buff *skb) | |
946 | { | |
947 | struct tcphdr *th = skb->h.th, *t1; | |
948 | struct sk_buff *buff; | |
949 | struct flowi fl; | |
950 | ||
951 | if (th->rst) | |
952 | return; | |
953 | ||
954 | if (!ipv6_unicast_destination(skb)) | |
955 | return; | |
956 | ||
957 | /* | |
958 | * We need to grab some memory, and put together an RST, | |
959 | * and then put it into the queue to be sent. | |
960 | */ | |
961 | ||
962 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr), | |
963 | GFP_ATOMIC); | |
964 | if (buff == NULL) | |
965 | return; | |
966 | ||
967 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr)); | |
968 | ||
969 | t1 = (struct tcphdr *) skb_push(buff,sizeof(struct tcphdr)); | |
970 | ||
971 | /* Swap the send and the receive. */ | |
972 | memset(t1, 0, sizeof(*t1)); | |
973 | t1->dest = th->source; | |
974 | t1->source = th->dest; | |
975 | t1->doff = sizeof(*t1)/4; | |
976 | t1->rst = 1; | |
977 | ||
978 | if(th->ack) { | |
979 | t1->seq = th->ack_seq; | |
980 | } else { | |
981 | t1->ack = 1; | |
982 | t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin | |
983 | + skb->len - (th->doff<<2)); | |
984 | } | |
985 | ||
986 | buff->csum = csum_partial((char *)t1, sizeof(*t1), 0); | |
987 | ||
988 | memset(&fl, 0, sizeof(fl)); | |
989 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); | |
990 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); | |
991 | ||
992 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
993 | sizeof(*t1), IPPROTO_TCP, | |
994 | buff->csum); | |
995 | ||
996 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 997 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
998 | fl.fl_ip_dport = t1->dest; |
999 | fl.fl_ip_sport = t1->source; | |
1000 | ||
1001 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
1002 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
1003 | ||
1004 | if ((xfrm_lookup(&buff->dst, &fl, NULL, 0)) < 0) { | |
1005 | dst_release(buff->dst); | |
1006 | return; | |
1007 | } | |
1008 | ||
1009 | ip6_xmit(NULL, buff, &fl, NULL, 0); | |
1010 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
1011 | TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); | |
1012 | return; | |
1013 | } | |
1014 | ||
1015 | kfree_skb(buff); | |
1016 | } | |
1017 | ||
1018 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts) | |
1019 | { | |
1020 | struct tcphdr *th = skb->h.th, *t1; | |
1021 | struct sk_buff *buff; | |
1022 | struct flowi fl; | |
1023 | int tot_len = sizeof(struct tcphdr); | |
1024 | ||
1025 | if (ts) | |
1026 | tot_len += 3*4; | |
1027 | ||
1028 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, | |
1029 | GFP_ATOMIC); | |
1030 | if (buff == NULL) | |
1031 | return; | |
1032 | ||
1033 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); | |
1034 | ||
1035 | t1 = (struct tcphdr *) skb_push(buff,tot_len); | |
1036 | ||
1037 | /* Swap the send and the receive. */ | |
1038 | memset(t1, 0, sizeof(*t1)); | |
1039 | t1->dest = th->source; | |
1040 | t1->source = th->dest; | |
1041 | t1->doff = tot_len/4; | |
1042 | t1->seq = htonl(seq); | |
1043 | t1->ack_seq = htonl(ack); | |
1044 | t1->ack = 1; | |
1045 | t1->window = htons(win); | |
1046 | ||
1047 | if (ts) { | |
1048 | u32 *ptr = (u32*)(t1 + 1); | |
1049 | *ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
1050 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
1051 | *ptr++ = htonl(tcp_time_stamp); | |
1052 | *ptr = htonl(ts); | |
1053 | } | |
1054 | ||
1055 | buff->csum = csum_partial((char *)t1, tot_len, 0); | |
1056 | ||
1057 | memset(&fl, 0, sizeof(fl)); | |
1058 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); | |
1059 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); | |
1060 | ||
1061 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
1062 | tot_len, IPPROTO_TCP, | |
1063 | buff->csum); | |
1064 | ||
1065 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 1066 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
1067 | fl.fl_ip_dport = t1->dest; |
1068 | fl.fl_ip_sport = t1->source; | |
1069 | ||
1070 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
1071 | if ((xfrm_lookup(&buff->dst, &fl, NULL, 0)) < 0) { | |
1072 | dst_release(buff->dst); | |
1073 | return; | |
1074 | } | |
1075 | ip6_xmit(NULL, buff, &fl, NULL, 0); | |
1076 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
1077 | return; | |
1078 | } | |
1079 | ||
1080 | kfree_skb(buff); | |
1081 | } | |
1082 | ||
1083 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1084 | { | |
8feaf0c0 ACM |
1085 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1086 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sk); | |
1da177e4 | 1087 | |
8feaf0c0 ACM |
1088 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
1089 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, | |
1090 | tcptw->tw_ts_recent); | |
1da177e4 | 1091 | |
8feaf0c0 | 1092 | inet_twsk_put(tw); |
1da177e4 LT |
1093 | } |
1094 | ||
60236fdd | 1095 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req) |
1da177e4 | 1096 | { |
2e6599cb | 1097 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent); |
1da177e4 LT |
1098 | } |
1099 | ||
1100 | ||
1101 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
1102 | { | |
60236fdd | 1103 | struct request_sock *req, **prev; |
505cbfc5 | 1104 | const struct tcphdr *th = skb->h.th; |
1da177e4 LT |
1105 | struct sock *nsk; |
1106 | ||
1107 | /* Find possible connection requests. */ | |
463c84b9 | 1108 | req = tcp_v6_search_req(sk, &prev, th->source, &skb->nh.ipv6h->saddr, |
505cbfc5 | 1109 | &skb->nh.ipv6h->daddr, inet6_iif(skb)); |
1da177e4 LT |
1110 | if (req) |
1111 | return tcp_check_req(sk, skb, req, prev); | |
1112 | ||
505cbfc5 ACM |
1113 | nsk = __inet6_lookup_established(&tcp_hashinfo, &skb->nh.ipv6h->saddr, |
1114 | th->source, &skb->nh.ipv6h->daddr, | |
1115 | ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
1116 | |
1117 | if (nsk) { | |
1118 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1119 | bh_lock_sock(nsk); | |
1120 | return nsk; | |
1121 | } | |
8feaf0c0 | 1122 | inet_twsk_put((struct inet_timewait_sock *)nsk); |
1da177e4 LT |
1123 | return NULL; |
1124 | } | |
1125 | ||
1126 | #if 0 /*def CONFIG_SYN_COOKIES*/ | |
1127 | if (!th->rst && !th->syn && th->ack) | |
1128 | sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt)); | |
1129 | #endif | |
1130 | return sk; | |
1131 | } | |
1132 | ||
60236fdd | 1133 | static void tcp_v6_synq_add(struct sock *sk, struct request_sock *req) |
1da177e4 | 1134 | { |
463c84b9 ACM |
1135 | struct inet_connection_sock *icsk = inet_csk(sk); |
1136 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
1137 | const u32 h = tcp_v6_synq_hash(&tcp6_rsk(req)->rmt_addr, inet_rsk(req)->rmt_port, lopt->hash_rnd); | |
1da177e4 | 1138 | |
463c84b9 ACM |
1139 | reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, TCP_TIMEOUT_INIT); |
1140 | inet_csk_reqsk_queue_added(sk, TCP_TIMEOUT_INIT); | |
1da177e4 LT |
1141 | } |
1142 | ||
1143 | ||
1144 | /* FIXME: this is substantially similar to the ipv4 code. | |
1145 | * Can some kind of merge be done? -- erics | |
1146 | */ | |
1147 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1148 | { | |
2e6599cb | 1149 | struct tcp6_request_sock *treq; |
1da177e4 LT |
1150 | struct ipv6_pinfo *np = inet6_sk(sk); |
1151 | struct tcp_options_received tmp_opt; | |
1152 | struct tcp_sock *tp = tcp_sk(sk); | |
60236fdd | 1153 | struct request_sock *req = NULL; |
1da177e4 LT |
1154 | __u32 isn = TCP_SKB_CB(skb)->when; |
1155 | ||
1156 | if (skb->protocol == htons(ETH_P_IP)) | |
1157 | return tcp_v4_conn_request(sk, skb); | |
1158 | ||
1159 | if (!ipv6_unicast_destination(skb)) | |
1160 | goto drop; | |
1161 | ||
1162 | /* | |
1163 | * There are no SYN attacks on IPv6, yet... | |
1164 | */ | |
463c84b9 | 1165 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 LT |
1166 | if (net_ratelimit()) |
1167 | printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n"); | |
1168 | goto drop; | |
1169 | } | |
1170 | ||
463c84b9 | 1171 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1172 | goto drop; |
1173 | ||
60236fdd | 1174 | req = reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1175 | if (req == NULL) |
1176 | goto drop; | |
1177 | ||
1178 | tcp_clear_options(&tmp_opt); | |
1179 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1180 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
1181 | ||
1182 | tcp_parse_options(skb, &tmp_opt, 0); | |
1183 | ||
1184 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; | |
1185 | tcp_openreq_init(req, &tmp_opt, skb); | |
1186 | ||
2e6599cb ACM |
1187 | treq = tcp6_rsk(req); |
1188 | ipv6_addr_copy(&treq->rmt_addr, &skb->nh.ipv6h->saddr); | |
1189 | ipv6_addr_copy(&treq->loc_addr, &skb->nh.ipv6h->daddr); | |
1da177e4 | 1190 | TCP_ECN_create_request(req, skb->h.th); |
2e6599cb | 1191 | treq->pktopts = NULL; |
1da177e4 LT |
1192 | if (ipv6_opt_accepted(sk, skb) || |
1193 | np->rxopt.bits.rxinfo || | |
1194 | np->rxopt.bits.rxhlim) { | |
1195 | atomic_inc(&skb->users); | |
2e6599cb | 1196 | treq->pktopts = skb; |
1da177e4 | 1197 | } |
2e6599cb | 1198 | treq->iif = sk->sk_bound_dev_if; |
1da177e4 LT |
1199 | |
1200 | /* So that link locals have meaning */ | |
1201 | if (!sk->sk_bound_dev_if && | |
2e6599cb | 1202 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) |
505cbfc5 | 1203 | treq->iif = inet6_iif(skb); |
1da177e4 LT |
1204 | |
1205 | if (isn == 0) | |
1206 | isn = tcp_v6_init_sequence(sk,skb); | |
1207 | ||
2e6599cb | 1208 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 LT |
1209 | |
1210 | if (tcp_v6_send_synack(sk, req, NULL)) | |
1211 | goto drop; | |
1212 | ||
1213 | tcp_v6_synq_add(sk, req); | |
1214 | ||
1215 | return 0; | |
1216 | ||
1217 | drop: | |
1218 | if (req) | |
60236fdd | 1219 | reqsk_free(req); |
1da177e4 LT |
1220 | |
1221 | TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS); | |
1222 | return 0; /* don't send reset */ | |
1223 | } | |
1224 | ||
1225 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1226 | struct request_sock *req, |
1da177e4 LT |
1227 | struct dst_entry *dst) |
1228 | { | |
2e6599cb | 1229 | struct tcp6_request_sock *treq = tcp6_rsk(req); |
1da177e4 LT |
1230 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1231 | struct tcp6_sock *newtcp6sk; | |
1232 | struct inet_sock *newinet; | |
1233 | struct tcp_sock *newtp; | |
1234 | struct sock *newsk; | |
1235 | struct ipv6_txoptions *opt; | |
1236 | ||
1237 | if (skb->protocol == htons(ETH_P_IP)) { | |
1238 | /* | |
1239 | * v6 mapped | |
1240 | */ | |
1241 | ||
1242 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1243 | ||
1244 | if (newsk == NULL) | |
1245 | return NULL; | |
1246 | ||
1247 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1248 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1249 | ||
1250 | newinet = inet_sk(newsk); | |
1251 | newnp = inet6_sk(newsk); | |
1252 | newtp = tcp_sk(newsk); | |
1253 | ||
1254 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1255 | ||
1256 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
1257 | newinet->daddr); | |
1258 | ||
1259 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
1260 | newinet->saddr); | |
1261 | ||
1262 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1263 | ||
1264 | newtp->af_specific = &ipv6_mapped; | |
1265 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; | |
1266 | newnp->pktoptions = NULL; | |
1267 | newnp->opt = NULL; | |
505cbfc5 | 1268 | newnp->mcast_oif = inet6_iif(skb); |
1da177e4 LT |
1269 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; |
1270 | ||
e6848976 ACM |
1271 | /* |
1272 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1273 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1274 | * that function for the gory details. -acme | |
1da177e4 | 1275 | */ |
1da177e4 LT |
1276 | |
1277 | /* It is tricky place. Until this moment IPv4 tcp | |
1278 | worked with IPv6 af_tcp.af_specific. | |
1279 | Sync it now. | |
1280 | */ | |
1281 | tcp_sync_mss(newsk, newtp->pmtu_cookie); | |
1282 | ||
1283 | return newsk; | |
1284 | } | |
1285 | ||
1286 | opt = np->opt; | |
1287 | ||
1288 | if (sk_acceptq_is_full(sk)) | |
1289 | goto out_overflow; | |
1290 | ||
1291 | if (np->rxopt.bits.srcrt == 2 && | |
2e6599cb ACM |
1292 | opt == NULL && treq->pktopts) { |
1293 | struct inet6_skb_parm *rxopt = IP6CB(treq->pktopts); | |
1da177e4 | 1294 | if (rxopt->srcrt) |
2e6599cb | 1295 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr *)(treq->pktopts->nh.raw + rxopt->srcrt)); |
1da177e4 LT |
1296 | } |
1297 | ||
1298 | if (dst == NULL) { | |
1299 | struct in6_addr *final_p = NULL, final; | |
1300 | struct flowi fl; | |
1301 | ||
1302 | memset(&fl, 0, sizeof(fl)); | |
1303 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1304 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
1305 | if (opt && opt->srcrt) { |
1306 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1307 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1308 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1309 | final_p = &final; | |
1310 | } | |
2e6599cb | 1311 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1312 | fl.oif = sk->sk_bound_dev_if; |
2e6599cb | 1313 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
1da177e4 LT |
1314 | fl.fl_ip_sport = inet_sk(sk)->sport; |
1315 | ||
1316 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1317 | goto out; | |
1318 | ||
1319 | if (final_p) | |
1320 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1321 | ||
1322 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
1323 | goto out; | |
1324 | } | |
1325 | ||
1326 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1327 | if (newsk == NULL) | |
1328 | goto out; | |
1329 | ||
e6848976 ACM |
1330 | /* |
1331 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1332 | * count here, tcp_create_openreq_child now does this for us, see the | |
1333 | * comment in that function for the gory details. -acme | |
1334 | */ | |
1da177e4 LT |
1335 | |
1336 | ip6_dst_store(newsk, dst, NULL); | |
1337 | newsk->sk_route_caps = dst->dev->features & | |
1338 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1339 | ||
1340 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1341 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1342 | ||
1343 | newtp = tcp_sk(newsk); | |
1344 | newinet = inet_sk(newsk); | |
1345 | newnp = inet6_sk(newsk); | |
1346 | ||
1347 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1348 | ||
2e6599cb ACM |
1349 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1350 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1351 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1352 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 LT |
1353 | |
1354 | /* Now IPv6 options... | |
1355 | ||
1356 | First: no IPv4 options. | |
1357 | */ | |
1358 | newinet->opt = NULL; | |
1359 | ||
1360 | /* Clone RX bits */ | |
1361 | newnp->rxopt.all = np->rxopt.all; | |
1362 | ||
1363 | /* Clone pktoptions received with SYN */ | |
1364 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1365 | if (treq->pktopts != NULL) { |
1366 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1367 | kfree_skb(treq->pktopts); | |
1368 | treq->pktopts = NULL; | |
1da177e4 LT |
1369 | if (newnp->pktoptions) |
1370 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1371 | } | |
1372 | newnp->opt = NULL; | |
505cbfc5 | 1373 | newnp->mcast_oif = inet6_iif(skb); |
1da177e4 LT |
1374 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; |
1375 | ||
1376 | /* Clone native IPv6 options from listening socket (if any) | |
1377 | ||
1378 | Yes, keeping reference count would be much more clever, | |
1379 | but we make one more one thing there: reattach optmem | |
1380 | to newsk. | |
1381 | */ | |
1382 | if (opt) { | |
1383 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1384 | if (opt != np->opt) | |
1385 | sock_kfree_s(sk, opt, opt->tot_len); | |
1386 | } | |
1387 | ||
1388 | newtp->ext_header_len = 0; | |
1389 | if (newnp->opt) | |
1390 | newtp->ext_header_len = newnp->opt->opt_nflen + | |
1391 | newnp->opt->opt_flen; | |
1392 | ||
1393 | tcp_sync_mss(newsk, dst_mtu(dst)); | |
1394 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1395 | tcp_initialize_rcv_mss(newsk); | |
1396 | ||
1397 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
1398 | ||
1399 | __tcp_v6_hash(newsk); | |
2d8c4ce5 | 1400 | inet_inherit_port(&tcp_hashinfo, sk, newsk); |
1da177e4 LT |
1401 | |
1402 | return newsk; | |
1403 | ||
1404 | out_overflow: | |
1405 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
1406 | out: | |
1407 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
1408 | if (opt && opt != np->opt) | |
1409 | sock_kfree_s(sk, opt, opt->tot_len); | |
1410 | dst_release(dst); | |
1411 | return NULL; | |
1412 | } | |
1413 | ||
1414 | static int tcp_v6_checksum_init(struct sk_buff *skb) | |
1415 | { | |
1416 | if (skb->ip_summed == CHECKSUM_HW) { | |
1417 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1418 | if (!tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, | |
1419 | &skb->nh.ipv6h->daddr,skb->csum)) | |
1420 | return 0; | |
64ce2073 | 1421 | LIMIT_NETDEBUG(KERN_DEBUG "hw tcp v6 csum failed\n"); |
1da177e4 LT |
1422 | } |
1423 | if (skb->len <= 76) { | |
1424 | if (tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, | |
1425 | &skb->nh.ipv6h->daddr,skb_checksum(skb, 0, skb->len, 0))) | |
1426 | return -1; | |
1427 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1428 | } else { | |
1429 | skb->csum = ~tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, | |
1430 | &skb->nh.ipv6h->daddr,0); | |
1431 | } | |
1432 | return 0; | |
1433 | } | |
1434 | ||
1435 | /* The socket must have it's spinlock held when we get | |
1436 | * here. | |
1437 | * | |
1438 | * We have a potential double-lock case here, so even when | |
1439 | * doing backlog processing we use the BH locking scheme. | |
1440 | * This is because we cannot sleep with the original spinlock | |
1441 | * held. | |
1442 | */ | |
1443 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1444 | { | |
1445 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1446 | struct tcp_sock *tp; | |
1447 | struct sk_buff *opt_skb = NULL; | |
1448 | ||
1449 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1450 | goes to IPv4 receive handler and backlogged. | |
1451 | From backlog it always goes here. Kerboom... | |
1452 | Fortunately, tcp_rcv_established and rcv_established | |
1453 | handle them correctly, but it is not case with | |
1454 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1455 | */ | |
1456 | ||
1457 | if (skb->protocol == htons(ETH_P_IP)) | |
1458 | return tcp_v4_do_rcv(sk, skb); | |
1459 | ||
1460 | if (sk_filter(sk, skb, 0)) | |
1461 | goto discard; | |
1462 | ||
1463 | /* | |
1464 | * socket locking is here for SMP purposes as backlog rcv | |
1465 | * is currently called with bh processing disabled. | |
1466 | */ | |
1467 | ||
1468 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1469 | ||
1470 | Yes, guys, it is the only place in our code, where we | |
1471 | may make it not affecting IPv4. | |
1472 | The rest of code is protocol independent, | |
1473 | and I do not like idea to uglify IPv4. | |
1474 | ||
1475 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1476 | looks not very well thought. For now we latch | |
1477 | options, received in the last packet, enqueued | |
1478 | by tcp. Feel free to propose better solution. | |
1479 | --ANK (980728) | |
1480 | */ | |
1481 | if (np->rxopt.all) | |
1482 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1483 | ||
1484 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1485 | TCP_CHECK_TIMER(sk); | |
1486 | if (tcp_rcv_established(sk, skb, skb->h.th, skb->len)) | |
1487 | goto reset; | |
1488 | TCP_CHECK_TIMER(sk); | |
1489 | if (opt_skb) | |
1490 | goto ipv6_pktoptions; | |
1491 | return 0; | |
1492 | } | |
1493 | ||
1494 | if (skb->len < (skb->h.th->doff<<2) || tcp_checksum_complete(skb)) | |
1495 | goto csum_err; | |
1496 | ||
1497 | if (sk->sk_state == TCP_LISTEN) { | |
1498 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); | |
1499 | if (!nsk) | |
1500 | goto discard; | |
1501 | ||
1502 | /* | |
1503 | * Queue it on the new socket if the new socket is active, | |
1504 | * otherwise we just shortcircuit this and continue with | |
1505 | * the new socket.. | |
1506 | */ | |
1507 | if(nsk != sk) { | |
1508 | if (tcp_child_process(sk, nsk, skb)) | |
1509 | goto reset; | |
1510 | if (opt_skb) | |
1511 | __kfree_skb(opt_skb); | |
1512 | return 0; | |
1513 | } | |
1514 | } | |
1515 | ||
1516 | TCP_CHECK_TIMER(sk); | |
1517 | if (tcp_rcv_state_process(sk, skb, skb->h.th, skb->len)) | |
1518 | goto reset; | |
1519 | TCP_CHECK_TIMER(sk); | |
1520 | if (opt_skb) | |
1521 | goto ipv6_pktoptions; | |
1522 | return 0; | |
1523 | ||
1524 | reset: | |
1525 | tcp_v6_send_reset(skb); | |
1526 | discard: | |
1527 | if (opt_skb) | |
1528 | __kfree_skb(opt_skb); | |
1529 | kfree_skb(skb); | |
1530 | return 0; | |
1531 | csum_err: | |
1532 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1533 | goto discard; | |
1534 | ||
1535 | ||
1536 | ipv6_pktoptions: | |
1537 | /* Do you ask, what is it? | |
1538 | ||
1539 | 1. skb was enqueued by tcp. | |
1540 | 2. skb is added to tail of read queue, rather than out of order. | |
1541 | 3. socket is not in passive state. | |
1542 | 4. Finally, it really contains options, which user wants to receive. | |
1543 | */ | |
1544 | tp = tcp_sk(sk); | |
1545 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1546 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
1547 | if (np->rxopt.bits.rxinfo) | |
505cbfc5 | 1548 | np->mcast_oif = inet6_iif(opt_skb); |
1da177e4 LT |
1549 | if (np->rxopt.bits.rxhlim) |
1550 | np->mcast_hops = opt_skb->nh.ipv6h->hop_limit; | |
1551 | if (ipv6_opt_accepted(sk, opt_skb)) { | |
1552 | skb_set_owner_r(opt_skb, sk); | |
1553 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1554 | } else { | |
1555 | __kfree_skb(opt_skb); | |
1556 | opt_skb = xchg(&np->pktoptions, NULL); | |
1557 | } | |
1558 | } | |
1559 | ||
1560 | if (opt_skb) | |
1561 | kfree_skb(opt_skb); | |
1562 | return 0; | |
1563 | } | |
1564 | ||
1565 | static int tcp_v6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) | |
1566 | { | |
1567 | struct sk_buff *skb = *pskb; | |
1568 | struct tcphdr *th; | |
1569 | struct sock *sk; | |
1570 | int ret; | |
1571 | ||
1572 | if (skb->pkt_type != PACKET_HOST) | |
1573 | goto discard_it; | |
1574 | ||
1575 | /* | |
1576 | * Count it even if it's bad. | |
1577 | */ | |
1578 | TCP_INC_STATS_BH(TCP_MIB_INSEGS); | |
1579 | ||
1580 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1581 | goto discard_it; | |
1582 | ||
1583 | th = skb->h.th; | |
1584 | ||
1585 | if (th->doff < sizeof(struct tcphdr)/4) | |
1586 | goto bad_packet; | |
1587 | if (!pskb_may_pull(skb, th->doff*4)) | |
1588 | goto discard_it; | |
1589 | ||
1590 | if ((skb->ip_summed != CHECKSUM_UNNECESSARY && | |
1591 | tcp_v6_checksum_init(skb) < 0)) | |
1592 | goto bad_packet; | |
1593 | ||
1594 | th = skb->h.th; | |
1595 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1596 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1597 | skb->len - th->doff*4); | |
1598 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1599 | TCP_SKB_CB(skb)->when = 0; | |
1600 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(skb->nh.ipv6h); | |
1601 | TCP_SKB_CB(skb)->sacked = 0; | |
1602 | ||
505cbfc5 ACM |
1603 | sk = __inet6_lookup(&tcp_hashinfo, &skb->nh.ipv6h->saddr, th->source, |
1604 | &skb->nh.ipv6h->daddr, ntohs(th->dest), | |
1605 | inet6_iif(skb)); | |
1da177e4 LT |
1606 | |
1607 | if (!sk) | |
1608 | goto no_tcp_socket; | |
1609 | ||
1610 | process: | |
1611 | if (sk->sk_state == TCP_TIME_WAIT) | |
1612 | goto do_time_wait; | |
1613 | ||
1614 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1615 | goto discard_and_relse; | |
1616 | ||
1617 | if (sk_filter(sk, skb, 0)) | |
1618 | goto discard_and_relse; | |
1619 | ||
1620 | skb->dev = NULL; | |
1621 | ||
1622 | bh_lock_sock(sk); | |
1623 | ret = 0; | |
1624 | if (!sock_owned_by_user(sk)) { | |
1625 | if (!tcp_prequeue(sk, skb)) | |
1626 | ret = tcp_v6_do_rcv(sk, skb); | |
1627 | } else | |
1628 | sk_add_backlog(sk, skb); | |
1629 | bh_unlock_sock(sk); | |
1630 | ||
1631 | sock_put(sk); | |
1632 | return ret ? -1 : 0; | |
1633 | ||
1634 | no_tcp_socket: | |
1635 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1636 | goto discard_it; | |
1637 | ||
1638 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1639 | bad_packet: | |
1640 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1641 | } else { | |
1642 | tcp_v6_send_reset(skb); | |
1643 | } | |
1644 | ||
1645 | discard_it: | |
1646 | ||
1647 | /* | |
1648 | * Discard frame | |
1649 | */ | |
1650 | ||
1651 | kfree_skb(skb); | |
1652 | return 0; | |
1653 | ||
1654 | discard_and_relse: | |
1655 | sock_put(sk); | |
1656 | goto discard_it; | |
1657 | ||
1658 | do_time_wait: | |
1659 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
8feaf0c0 | 1660 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
1661 | goto discard_it; |
1662 | } | |
1663 | ||
1664 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1665 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
8feaf0c0 | 1666 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
1667 | goto discard_it; |
1668 | } | |
1669 | ||
8feaf0c0 ACM |
1670 | switch (tcp_timewait_state_process((struct inet_timewait_sock *)sk, |
1671 | skb, th)) { | |
1da177e4 LT |
1672 | case TCP_TW_SYN: |
1673 | { | |
1674 | struct sock *sk2; | |
1675 | ||
505cbfc5 ACM |
1676 | sk2 = inet6_lookup_listener(&tcp_hashinfo, |
1677 | &skb->nh.ipv6h->daddr, | |
1678 | ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 | 1679 | if (sk2 != NULL) { |
295ff7ed ACM |
1680 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1681 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1682 | inet_twsk_put(tw); | |
1da177e4 LT |
1683 | sk = sk2; |
1684 | goto process; | |
1685 | } | |
1686 | /* Fall through to ACK */ | |
1687 | } | |
1688 | case TCP_TW_ACK: | |
1689 | tcp_v6_timewait_ack(sk, skb); | |
1690 | break; | |
1691 | case TCP_TW_RST: | |
1692 | goto no_tcp_socket; | |
1693 | case TCP_TW_SUCCESS:; | |
1694 | } | |
1695 | goto discard_it; | |
1696 | } | |
1697 | ||
1698 | static int tcp_v6_rebuild_header(struct sock *sk) | |
1699 | { | |
1700 | int err; | |
1701 | struct dst_entry *dst; | |
1702 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1703 | ||
1704 | dst = __sk_dst_check(sk, np->dst_cookie); | |
1705 | ||
1706 | if (dst == NULL) { | |
1707 | struct inet_sock *inet = inet_sk(sk); | |
1708 | struct in6_addr *final_p = NULL, final; | |
1709 | struct flowi fl; | |
1710 | ||
1711 | memset(&fl, 0, sizeof(fl)); | |
1712 | fl.proto = IPPROTO_TCP; | |
1713 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
1714 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
1715 | fl.fl6_flowlabel = np->flow_label; | |
1716 | fl.oif = sk->sk_bound_dev_if; | |
1717 | fl.fl_ip_dport = inet->dport; | |
1718 | fl.fl_ip_sport = inet->sport; | |
1719 | ||
1720 | if (np->opt && np->opt->srcrt) { | |
1721 | struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; | |
1722 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1723 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1724 | final_p = &final; | |
1725 | } | |
1726 | ||
1727 | err = ip6_dst_lookup(sk, &dst, &fl); | |
1728 | if (err) { | |
1729 | sk->sk_route_caps = 0; | |
1730 | return err; | |
1731 | } | |
1732 | if (final_p) | |
1733 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1734 | ||
1735 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
1736 | sk->sk_err_soft = -err; | |
1737 | dst_release(dst); | |
1738 | return err; | |
1739 | } | |
1740 | ||
1741 | ip6_dst_store(sk, dst, NULL); | |
1742 | sk->sk_route_caps = dst->dev->features & | |
1743 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1744 | } | |
1745 | ||
1746 | return 0; | |
1747 | } | |
1748 | ||
1749 | static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok) | |
1750 | { | |
1751 | struct sock *sk = skb->sk; | |
1752 | struct inet_sock *inet = inet_sk(sk); | |
1753 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1754 | struct flowi fl; | |
1755 | struct dst_entry *dst; | |
1756 | struct in6_addr *final_p = NULL, final; | |
1757 | ||
1758 | memset(&fl, 0, sizeof(fl)); | |
1759 | fl.proto = IPPROTO_TCP; | |
1760 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
1761 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
1762 | fl.fl6_flowlabel = np->flow_label; | |
1763 | IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); | |
1764 | fl.oif = sk->sk_bound_dev_if; | |
1765 | fl.fl_ip_sport = inet->sport; | |
1766 | fl.fl_ip_dport = inet->dport; | |
1767 | ||
1768 | if (np->opt && np->opt->srcrt) { | |
1769 | struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; | |
1770 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1771 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1772 | final_p = &final; | |
1773 | } | |
1774 | ||
1775 | dst = __sk_dst_check(sk, np->dst_cookie); | |
1776 | ||
1777 | if (dst == NULL) { | |
1778 | int err = ip6_dst_lookup(sk, &dst, &fl); | |
1779 | ||
1780 | if (err) { | |
1781 | sk->sk_err_soft = -err; | |
1782 | return err; | |
1783 | } | |
1784 | ||
1785 | if (final_p) | |
1786 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1787 | ||
1788 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
1789 | sk->sk_route_caps = 0; | |
1790 | dst_release(dst); | |
1791 | return err; | |
1792 | } | |
1793 | ||
1794 | ip6_dst_store(sk, dst, NULL); | |
1795 | sk->sk_route_caps = dst->dev->features & | |
1796 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1797 | } | |
1798 | ||
1799 | skb->dst = dst_clone(dst); | |
1800 | ||
1801 | /* Restore final destination back after routing done */ | |
1802 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
1803 | ||
1804 | return ip6_xmit(sk, skb, &fl, np->opt, 0); | |
1805 | } | |
1806 | ||
1807 | static void v6_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) | |
1808 | { | |
1809 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1810 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; | |
1811 | ||
1812 | sin6->sin6_family = AF_INET6; | |
1813 | ipv6_addr_copy(&sin6->sin6_addr, &np->daddr); | |
1814 | sin6->sin6_port = inet_sk(sk)->dport; | |
1815 | /* We do not store received flowlabel for TCP */ | |
1816 | sin6->sin6_flowinfo = 0; | |
1817 | sin6->sin6_scope_id = 0; | |
1818 | if (sk->sk_bound_dev_if && | |
1819 | ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
1820 | sin6->sin6_scope_id = sk->sk_bound_dev_if; | |
1821 | } | |
1822 | ||
1823 | static int tcp_v6_remember_stamp(struct sock *sk) | |
1824 | { | |
1825 | /* Alas, not yet... */ | |
1826 | return 0; | |
1827 | } | |
1828 | ||
1829 | static struct tcp_func ipv6_specific = { | |
1830 | .queue_xmit = tcp_v6_xmit, | |
1831 | .send_check = tcp_v6_send_check, | |
1832 | .rebuild_header = tcp_v6_rebuild_header, | |
1833 | .conn_request = tcp_v6_conn_request, | |
1834 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1835 | .remember_stamp = tcp_v6_remember_stamp, | |
1836 | .net_header_len = sizeof(struct ipv6hdr), | |
1837 | ||
1838 | .setsockopt = ipv6_setsockopt, | |
1839 | .getsockopt = ipv6_getsockopt, | |
1840 | .addr2sockaddr = v6_addr2sockaddr, | |
1841 | .sockaddr_len = sizeof(struct sockaddr_in6) | |
1842 | }; | |
1843 | ||
1844 | /* | |
1845 | * TCP over IPv4 via INET6 API | |
1846 | */ | |
1847 | ||
1848 | static struct tcp_func ipv6_mapped = { | |
1849 | .queue_xmit = ip_queue_xmit, | |
1850 | .send_check = tcp_v4_send_check, | |
32519f11 | 1851 | .rebuild_header = inet_sk_rebuild_header, |
1da177e4 LT |
1852 | .conn_request = tcp_v6_conn_request, |
1853 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1854 | .remember_stamp = tcp_v4_remember_stamp, | |
1855 | .net_header_len = sizeof(struct iphdr), | |
1856 | ||
1857 | .setsockopt = ipv6_setsockopt, | |
1858 | .getsockopt = ipv6_getsockopt, | |
1859 | .addr2sockaddr = v6_addr2sockaddr, | |
1860 | .sockaddr_len = sizeof(struct sockaddr_in6) | |
1861 | }; | |
1862 | ||
1863 | ||
1864 | ||
1865 | /* NOTE: A lot of things set to zero explicitly by call to | |
1866 | * sk_alloc() so need not be done here. | |
1867 | */ | |
1868 | static int tcp_v6_init_sock(struct sock *sk) | |
1869 | { | |
6687e988 | 1870 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1871 | struct tcp_sock *tp = tcp_sk(sk); |
1872 | ||
1873 | skb_queue_head_init(&tp->out_of_order_queue); | |
1874 | tcp_init_xmit_timers(sk); | |
1875 | tcp_prequeue_init(tp); | |
1876 | ||
6687e988 | 1877 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1878 | tp->mdev = TCP_TIMEOUT_INIT; |
1879 | ||
1880 | /* So many TCP implementations out there (incorrectly) count the | |
1881 | * initial SYN frame in their delayed-ACK and congestion control | |
1882 | * algorithms that we must have the following bandaid to talk | |
1883 | * efficiently to them. -DaveM | |
1884 | */ | |
1885 | tp->snd_cwnd = 2; | |
1886 | ||
1887 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1888 | * initialization of these values. | |
1889 | */ | |
1890 | tp->snd_ssthresh = 0x7fffffff; | |
1891 | tp->snd_cwnd_clamp = ~0; | |
c1b4a7e6 | 1892 | tp->mss_cache = 536; |
1da177e4 LT |
1893 | |
1894 | tp->reordering = sysctl_tcp_reordering; | |
1895 | ||
1896 | sk->sk_state = TCP_CLOSE; | |
1897 | ||
1898 | tp->af_specific = &ipv6_specific; | |
6687e988 | 1899 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
1da177e4 LT |
1900 | sk->sk_write_space = sk_stream_write_space; |
1901 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1902 | ||
1903 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; | |
1904 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1905 | ||
1906 | atomic_inc(&tcp_sockets_allocated); | |
1907 | ||
1908 | return 0; | |
1909 | } | |
1910 | ||
1911 | static int tcp_v6_destroy_sock(struct sock *sk) | |
1912 | { | |
1da177e4 LT |
1913 | tcp_v4_destroy_sock(sk); |
1914 | return inet6_destroy_sock(sk); | |
1915 | } | |
1916 | ||
1917 | /* Proc filesystem TCPv6 sock list dumping. */ | |
1918 | static void get_openreq6(struct seq_file *seq, | |
60236fdd | 1919 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 LT |
1920 | { |
1921 | struct in6_addr *dest, *src; | |
1922 | int ttd = req->expires - jiffies; | |
1923 | ||
1924 | if (ttd < 0) | |
1925 | ttd = 0; | |
1926 | ||
2e6599cb ACM |
1927 | src = &tcp6_rsk(req)->loc_addr; |
1928 | dest = &tcp6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1929 | seq_printf(seq, |
1930 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1931 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1932 | i, | |
1933 | src->s6_addr32[0], src->s6_addr32[1], | |
1934 | src->s6_addr32[2], src->s6_addr32[3], | |
1935 | ntohs(inet_sk(sk)->sport), | |
1936 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1937 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1938 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1939 | TCP_SYN_RECV, |
1940 | 0,0, /* could print option size, but that is af dependent. */ | |
1941 | 1, /* timers active (only the expire timer) */ | |
1942 | jiffies_to_clock_t(ttd), | |
1943 | req->retrans, | |
1944 | uid, | |
1945 | 0, /* non standard timer */ | |
1946 | 0, /* open_requests have no inode */ | |
1947 | 0, req); | |
1948 | } | |
1949 | ||
1950 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1951 | { | |
1952 | struct in6_addr *dest, *src; | |
1953 | __u16 destp, srcp; | |
1954 | int timer_active; | |
1955 | unsigned long timer_expires; | |
1956 | struct inet_sock *inet = inet_sk(sp); | |
1957 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1958 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
1959 | struct ipv6_pinfo *np = inet6_sk(sp); |
1960 | ||
1961 | dest = &np->daddr; | |
1962 | src = &np->rcv_saddr; | |
1963 | destp = ntohs(inet->dport); | |
1964 | srcp = ntohs(inet->sport); | |
463c84b9 ACM |
1965 | |
1966 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1967 | timer_active = 1; |
463c84b9 ACM |
1968 | timer_expires = icsk->icsk_timeout; |
1969 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1970 | timer_active = 4; |
463c84b9 | 1971 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1972 | } else if (timer_pending(&sp->sk_timer)) { |
1973 | timer_active = 2; | |
1974 | timer_expires = sp->sk_timer.expires; | |
1975 | } else { | |
1976 | timer_active = 0; | |
1977 | timer_expires = jiffies; | |
1978 | } | |
1979 | ||
1980 | seq_printf(seq, | |
1981 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1982 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n", | |
1983 | i, | |
1984 | src->s6_addr32[0], src->s6_addr32[1], | |
1985 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1986 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1987 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1988 | sp->sk_state, | |
1989 | tp->write_seq-tp->snd_una, tp->rcv_nxt-tp->copied_seq, | |
1990 | timer_active, | |
1991 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 1992 | icsk->icsk_retransmits, |
1da177e4 | 1993 | sock_i_uid(sp), |
6687e988 | 1994 | icsk->icsk_probes_out, |
1da177e4 LT |
1995 | sock_i_ino(sp), |
1996 | atomic_read(&sp->sk_refcnt), sp, | |
463c84b9 ACM |
1997 | icsk->icsk_rto, |
1998 | icsk->icsk_ack.ato, | |
1999 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, | |
1da177e4 LT |
2000 | tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh |
2001 | ); | |
2002 | } | |
2003 | ||
2004 | static void get_timewait6_sock(struct seq_file *seq, | |
8feaf0c0 | 2005 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
2006 | { |
2007 | struct in6_addr *dest, *src; | |
2008 | __u16 destp, srcp; | |
8feaf0c0 | 2009 | struct tcp6_timewait_sock *tcp6tw = tcp6_twsk((struct sock *)tw); |
1da177e4 LT |
2010 | int ttd = tw->tw_ttd - jiffies; |
2011 | ||
2012 | if (ttd < 0) | |
2013 | ttd = 0; | |
2014 | ||
8feaf0c0 ACM |
2015 | dest = &tcp6tw->tw_v6_daddr; |
2016 | src = &tcp6tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
2017 | destp = ntohs(tw->tw_dport); |
2018 | srcp = ntohs(tw->tw_sport); | |
2019 | ||
2020 | seq_printf(seq, | |
2021 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2022 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
2023 | i, | |
2024 | src->s6_addr32[0], src->s6_addr32[1], | |
2025 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2026 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2027 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2028 | tw->tw_substate, 0, 0, | |
2029 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2030 | atomic_read(&tw->tw_refcnt), tw); | |
2031 | } | |
2032 | ||
2033 | #ifdef CONFIG_PROC_FS | |
2034 | static int tcp6_seq_show(struct seq_file *seq, void *v) | |
2035 | { | |
2036 | struct tcp_iter_state *st; | |
2037 | ||
2038 | if (v == SEQ_START_TOKEN) { | |
2039 | seq_puts(seq, | |
2040 | " sl " | |
2041 | "local_address " | |
2042 | "remote_address " | |
2043 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2044 | " uid timeout inode\n"); | |
2045 | goto out; | |
2046 | } | |
2047 | st = seq->private; | |
2048 | ||
2049 | switch (st->state) { | |
2050 | case TCP_SEQ_STATE_LISTENING: | |
2051 | case TCP_SEQ_STATE_ESTABLISHED: | |
2052 | get_tcp6_sock(seq, v, st->num); | |
2053 | break; | |
2054 | case TCP_SEQ_STATE_OPENREQ: | |
2055 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
2056 | break; | |
2057 | case TCP_SEQ_STATE_TIME_WAIT: | |
2058 | get_timewait6_sock(seq, v, st->num); | |
2059 | break; | |
2060 | } | |
2061 | out: | |
2062 | return 0; | |
2063 | } | |
2064 | ||
2065 | static struct file_operations tcp6_seq_fops; | |
2066 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { | |
2067 | .owner = THIS_MODULE, | |
2068 | .name = "tcp6", | |
2069 | .family = AF_INET6, | |
2070 | .seq_show = tcp6_seq_show, | |
2071 | .seq_fops = &tcp6_seq_fops, | |
2072 | }; | |
2073 | ||
2074 | int __init tcp6_proc_init(void) | |
2075 | { | |
2076 | return tcp_proc_register(&tcp6_seq_afinfo); | |
2077 | } | |
2078 | ||
2079 | void tcp6_proc_exit(void) | |
2080 | { | |
2081 | tcp_proc_unregister(&tcp6_seq_afinfo); | |
2082 | } | |
2083 | #endif | |
2084 | ||
2085 | struct proto tcpv6_prot = { | |
2086 | .name = "TCPv6", | |
2087 | .owner = THIS_MODULE, | |
2088 | .close = tcp_close, | |
2089 | .connect = tcp_v6_connect, | |
2090 | .disconnect = tcp_disconnect, | |
463c84b9 | 2091 | .accept = inet_csk_accept, |
1da177e4 LT |
2092 | .ioctl = tcp_ioctl, |
2093 | .init = tcp_v6_init_sock, | |
2094 | .destroy = tcp_v6_destroy_sock, | |
2095 | .shutdown = tcp_shutdown, | |
2096 | .setsockopt = tcp_setsockopt, | |
2097 | .getsockopt = tcp_getsockopt, | |
2098 | .sendmsg = tcp_sendmsg, | |
2099 | .recvmsg = tcp_recvmsg, | |
2100 | .backlog_rcv = tcp_v6_do_rcv, | |
2101 | .hash = tcp_v6_hash, | |
2102 | .unhash = tcp_unhash, | |
2103 | .get_port = tcp_v6_get_port, | |
2104 | .enter_memory_pressure = tcp_enter_memory_pressure, | |
2105 | .sockets_allocated = &tcp_sockets_allocated, | |
2106 | .memory_allocated = &tcp_memory_allocated, | |
2107 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2108 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2109 | .sysctl_mem = sysctl_tcp_mem, |
2110 | .sysctl_wmem = sysctl_tcp_wmem, | |
2111 | .sysctl_rmem = sysctl_tcp_rmem, | |
2112 | .max_header = MAX_TCP_HEADER, | |
2113 | .obj_size = sizeof(struct tcp6_sock), | |
8feaf0c0 | 2114 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), |
60236fdd | 2115 | .rsk_prot = &tcp6_request_sock_ops, |
1da177e4 LT |
2116 | }; |
2117 | ||
2118 | static struct inet6_protocol tcpv6_protocol = { | |
2119 | .handler = tcp_v6_rcv, | |
2120 | .err_handler = tcp_v6_err, | |
2121 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
2122 | }; | |
2123 | ||
1da177e4 LT |
2124 | static struct inet_protosw tcpv6_protosw = { |
2125 | .type = SOCK_STREAM, | |
2126 | .protocol = IPPROTO_TCP, | |
2127 | .prot = &tcpv6_prot, | |
2128 | .ops = &inet6_stream_ops, | |
2129 | .capability = -1, | |
2130 | .no_check = 0, | |
2131 | .flags = INET_PROTOSW_PERMANENT, | |
2132 | }; | |
2133 | ||
2134 | void __init tcpv6_init(void) | |
2135 | { | |
2136 | /* register inet6 protocol */ | |
2137 | if (inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP) < 0) | |
2138 | printk(KERN_ERR "tcpv6_init: Could not register protocol\n"); | |
2139 | inet6_register_protosw(&tcpv6_protosw); | |
2140 | } |