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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> | |
50 | #include <net/ipv6.h> | |
51 | #include <net/transp_v6.h> | |
52 | #include <net/addrconf.h> | |
53 | #include <net/ip6_route.h> | |
54 | #include <net/ip6_checksum.h> | |
55 | #include <net/inet_ecn.h> | |
56 | #include <net/protocol.h> | |
57 | #include <net/xfrm.h> | |
58 | #include <net/addrconf.h> | |
59 | #include <net/snmp.h> | |
60 | #include <net/dsfield.h> | |
61 | ||
62 | #include <asm/uaccess.h> | |
63 | ||
64 | #include <linux/proc_fs.h> | |
65 | #include <linux/seq_file.h> | |
66 | ||
67 | static void tcp_v6_send_reset(struct sk_buff *skb); | |
68 | static void tcp_v6_or_send_ack(struct sk_buff *skb, struct open_request *req); | |
69 | static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len, | |
70 | struct sk_buff *skb); | |
71 | ||
72 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
73 | static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok); | |
74 | ||
75 | static struct tcp_func ipv6_mapped; | |
76 | static struct tcp_func ipv6_specific; | |
77 | ||
78 | /* I have no idea if this is a good hash for v6 or not. -DaveM */ | |
79 | static __inline__ int tcp_v6_hashfn(struct in6_addr *laddr, u16 lport, | |
80 | struct in6_addr *faddr, u16 fport) | |
81 | { | |
82 | int hashent = (lport ^ fport); | |
83 | ||
84 | hashent ^= (laddr->s6_addr32[3] ^ faddr->s6_addr32[3]); | |
85 | hashent ^= hashent>>16; | |
86 | hashent ^= hashent>>8; | |
87 | return (hashent & (tcp_ehash_size - 1)); | |
88 | } | |
89 | ||
90 | static __inline__ int tcp_v6_sk_hashfn(struct sock *sk) | |
91 | { | |
92 | struct inet_sock *inet = inet_sk(sk); | |
93 | struct ipv6_pinfo *np = inet6_sk(sk); | |
94 | struct in6_addr *laddr = &np->rcv_saddr; | |
95 | struct in6_addr *faddr = &np->daddr; | |
96 | __u16 lport = inet->num; | |
97 | __u16 fport = inet->dport; | |
98 | return tcp_v6_hashfn(laddr, lport, faddr, fport); | |
99 | } | |
100 | ||
101 | static inline int tcp_v6_bind_conflict(struct sock *sk, | |
102 | struct tcp_bind_bucket *tb) | |
103 | { | |
104 | struct sock *sk2; | |
105 | struct hlist_node *node; | |
106 | ||
107 | /* We must walk the whole port owner list in this case. -DaveM */ | |
108 | sk_for_each_bound(sk2, node, &tb->owners) { | |
109 | if (sk != sk2 && | |
110 | (!sk->sk_bound_dev_if || | |
111 | !sk2->sk_bound_dev_if || | |
112 | sk->sk_bound_dev_if == sk2->sk_bound_dev_if) && | |
113 | (!sk->sk_reuse || !sk2->sk_reuse || | |
114 | sk2->sk_state == TCP_LISTEN) && | |
115 | ipv6_rcv_saddr_equal(sk, sk2)) | |
116 | break; | |
117 | } | |
118 | ||
119 | return node != NULL; | |
120 | } | |
121 | ||
122 | /* Grrr, addr_type already calculated by caller, but I don't want | |
123 | * to add some silly "cookie" argument to this method just for that. | |
124 | * But it doesn't matter, the recalculation is in the rarest path | |
125 | * this function ever takes. | |
126 | */ | |
127 | static int tcp_v6_get_port(struct sock *sk, unsigned short snum) | |
128 | { | |
129 | struct tcp_bind_hashbucket *head; | |
130 | struct tcp_bind_bucket *tb; | |
131 | struct hlist_node *node; | |
132 | int ret; | |
133 | ||
134 | local_bh_disable(); | |
135 | if (snum == 0) { | |
136 | int low = sysctl_local_port_range[0]; | |
137 | int high = sysctl_local_port_range[1]; | |
138 | int remaining = (high - low) + 1; | |
139 | int rover; | |
140 | ||
141 | spin_lock(&tcp_portalloc_lock); | |
c3924c70 FH |
142 | if (tcp_port_rover < low) |
143 | rover = low; | |
144 | else | |
145 | rover = tcp_port_rover; | |
1da177e4 | 146 | do { rover++; |
c3924c70 | 147 | if (rover > high) |
1da177e4 LT |
148 | rover = low; |
149 | head = &tcp_bhash[tcp_bhashfn(rover)]; | |
150 | spin_lock(&head->lock); | |
151 | tb_for_each(tb, node, &head->chain) | |
152 | if (tb->port == rover) | |
153 | goto next; | |
154 | break; | |
155 | next: | |
156 | spin_unlock(&head->lock); | |
157 | } while (--remaining > 0); | |
158 | tcp_port_rover = rover; | |
159 | spin_unlock(&tcp_portalloc_lock); | |
160 | ||
161 | /* Exhausted local port range during search? */ | |
162 | ret = 1; | |
163 | if (remaining <= 0) | |
164 | goto fail; | |
165 | ||
166 | /* OK, here is the one we will use. */ | |
167 | snum = rover; | |
168 | } else { | |
169 | head = &tcp_bhash[tcp_bhashfn(snum)]; | |
170 | spin_lock(&head->lock); | |
171 | tb_for_each(tb, node, &head->chain) | |
172 | if (tb->port == snum) | |
173 | goto tb_found; | |
174 | } | |
175 | tb = NULL; | |
176 | goto tb_not_found; | |
177 | tb_found: | |
178 | if (tb && !hlist_empty(&tb->owners)) { | |
179 | if (tb->fastreuse > 0 && sk->sk_reuse && | |
180 | sk->sk_state != TCP_LISTEN) { | |
181 | goto success; | |
182 | } else { | |
183 | ret = 1; | |
184 | if (tcp_v6_bind_conflict(sk, tb)) | |
185 | goto fail_unlock; | |
186 | } | |
187 | } | |
188 | tb_not_found: | |
189 | ret = 1; | |
190 | if (!tb && (tb = tcp_bucket_create(head, snum)) == NULL) | |
191 | goto fail_unlock; | |
192 | if (hlist_empty(&tb->owners)) { | |
193 | if (sk->sk_reuse && sk->sk_state != TCP_LISTEN) | |
194 | tb->fastreuse = 1; | |
195 | else | |
196 | tb->fastreuse = 0; | |
197 | } else if (tb->fastreuse && | |
198 | (!sk->sk_reuse || sk->sk_state == TCP_LISTEN)) | |
199 | tb->fastreuse = 0; | |
200 | ||
201 | success: | |
202 | if (!tcp_sk(sk)->bind_hash) | |
203 | tcp_bind_hash(sk, tb, snum); | |
204 | BUG_TRAP(tcp_sk(sk)->bind_hash == tb); | |
205 | ret = 0; | |
206 | ||
207 | fail_unlock: | |
208 | spin_unlock(&head->lock); | |
209 | fail: | |
210 | local_bh_enable(); | |
211 | return ret; | |
212 | } | |
213 | ||
214 | static __inline__ void __tcp_v6_hash(struct sock *sk) | |
215 | { | |
216 | struct hlist_head *list; | |
217 | rwlock_t *lock; | |
218 | ||
219 | BUG_TRAP(sk_unhashed(sk)); | |
220 | ||
221 | if (sk->sk_state == TCP_LISTEN) { | |
222 | list = &tcp_listening_hash[tcp_sk_listen_hashfn(sk)]; | |
223 | lock = &tcp_lhash_lock; | |
224 | tcp_listen_wlock(); | |
225 | } else { | |
226 | sk->sk_hashent = tcp_v6_sk_hashfn(sk); | |
227 | list = &tcp_ehash[sk->sk_hashent].chain; | |
228 | lock = &tcp_ehash[sk->sk_hashent].lock; | |
229 | write_lock(lock); | |
230 | } | |
231 | ||
232 | __sk_add_node(sk, list); | |
233 | sock_prot_inc_use(sk->sk_prot); | |
234 | write_unlock(lock); | |
235 | } | |
236 | ||
237 | ||
238 | static void tcp_v6_hash(struct sock *sk) | |
239 | { | |
240 | if (sk->sk_state != TCP_CLOSE) { | |
241 | struct tcp_sock *tp = tcp_sk(sk); | |
242 | ||
243 | if (tp->af_specific == &ipv6_mapped) { | |
244 | tcp_prot.hash(sk); | |
245 | return; | |
246 | } | |
247 | local_bh_disable(); | |
248 | __tcp_v6_hash(sk); | |
249 | local_bh_enable(); | |
250 | } | |
251 | } | |
252 | ||
253 | static struct sock *tcp_v6_lookup_listener(struct in6_addr *daddr, unsigned short hnum, int dif) | |
254 | { | |
255 | struct sock *sk; | |
256 | struct hlist_node *node; | |
257 | struct sock *result = NULL; | |
258 | int score, hiscore; | |
259 | ||
260 | hiscore=0; | |
261 | read_lock(&tcp_lhash_lock); | |
262 | sk_for_each(sk, node, &tcp_listening_hash[tcp_lhashfn(hnum)]) { | |
263 | if (inet_sk(sk)->num == hnum && sk->sk_family == PF_INET6) { | |
264 | struct ipv6_pinfo *np = inet6_sk(sk); | |
265 | ||
266 | score = 1; | |
267 | if (!ipv6_addr_any(&np->rcv_saddr)) { | |
268 | if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) | |
269 | continue; | |
270 | score++; | |
271 | } | |
272 | if (sk->sk_bound_dev_if) { | |
273 | if (sk->sk_bound_dev_if != dif) | |
274 | continue; | |
275 | score++; | |
276 | } | |
277 | if (score == 3) { | |
278 | result = sk; | |
279 | break; | |
280 | } | |
281 | if (score > hiscore) { | |
282 | hiscore = score; | |
283 | result = sk; | |
284 | } | |
285 | } | |
286 | } | |
287 | if (result) | |
288 | sock_hold(result); | |
289 | read_unlock(&tcp_lhash_lock); | |
290 | return result; | |
291 | } | |
292 | ||
293 | /* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so | |
294 | * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM | |
295 | * | |
296 | * The sockhash lock must be held as a reader here. | |
297 | */ | |
298 | ||
299 | static inline struct sock *__tcp_v6_lookup_established(struct in6_addr *saddr, u16 sport, | |
300 | struct in6_addr *daddr, u16 hnum, | |
301 | int dif) | |
302 | { | |
303 | struct tcp_ehash_bucket *head; | |
304 | struct sock *sk; | |
305 | struct hlist_node *node; | |
306 | __u32 ports = TCP_COMBINED_PORTS(sport, hnum); | |
307 | int hash; | |
308 | ||
309 | /* Optimize here for direct hit, only listening connections can | |
310 | * have wildcards anyways. | |
311 | */ | |
312 | hash = tcp_v6_hashfn(daddr, hnum, saddr, sport); | |
313 | head = &tcp_ehash[hash]; | |
314 | read_lock(&head->lock); | |
315 | sk_for_each(sk, node, &head->chain) { | |
316 | /* For IPV6 do the cheaper port and family tests first. */ | |
317 | if(TCP_IPV6_MATCH(sk, saddr, daddr, ports, dif)) | |
318 | goto hit; /* You sunk my battleship! */ | |
319 | } | |
320 | /* Must check for a TIME_WAIT'er before going to listener hash. */ | |
321 | sk_for_each(sk, node, &(head + tcp_ehash_size)->chain) { | |
322 | /* FIXME: acme: check this... */ | |
323 | struct tcp_tw_bucket *tw = (struct tcp_tw_bucket *)sk; | |
324 | ||
325 | if(*((__u32 *)&(tw->tw_dport)) == ports && | |
326 | sk->sk_family == PF_INET6) { | |
327 | if(ipv6_addr_equal(&tw->tw_v6_daddr, saddr) && | |
328 | ipv6_addr_equal(&tw->tw_v6_rcv_saddr, daddr) && | |
329 | (!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dif)) | |
330 | goto hit; | |
331 | } | |
332 | } | |
333 | read_unlock(&head->lock); | |
334 | return NULL; | |
335 | ||
336 | hit: | |
337 | sock_hold(sk); | |
338 | read_unlock(&head->lock); | |
339 | return sk; | |
340 | } | |
341 | ||
342 | ||
343 | static inline struct sock *__tcp_v6_lookup(struct in6_addr *saddr, u16 sport, | |
344 | struct in6_addr *daddr, u16 hnum, | |
345 | int dif) | |
346 | { | |
347 | struct sock *sk; | |
348 | ||
349 | sk = __tcp_v6_lookup_established(saddr, sport, daddr, hnum, dif); | |
350 | ||
351 | if (sk) | |
352 | return sk; | |
353 | ||
354 | return tcp_v6_lookup_listener(daddr, hnum, dif); | |
355 | } | |
356 | ||
357 | inline struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport, | |
358 | struct in6_addr *daddr, u16 dport, | |
359 | int dif) | |
360 | { | |
361 | struct sock *sk; | |
362 | ||
363 | local_bh_disable(); | |
364 | sk = __tcp_v6_lookup(saddr, sport, daddr, ntohs(dport), dif); | |
365 | local_bh_enable(); | |
366 | ||
367 | return sk; | |
368 | } | |
369 | ||
370 | EXPORT_SYMBOL_GPL(tcp_v6_lookup); | |
371 | ||
372 | ||
373 | /* | |
374 | * Open request hash tables. | |
375 | */ | |
376 | ||
377 | static u32 tcp_v6_synq_hash(struct in6_addr *raddr, u16 rport, u32 rnd) | |
378 | { | |
379 | u32 a, b, c; | |
380 | ||
381 | a = raddr->s6_addr32[0]; | |
382 | b = raddr->s6_addr32[1]; | |
383 | c = raddr->s6_addr32[2]; | |
384 | ||
385 | a += JHASH_GOLDEN_RATIO; | |
386 | b += JHASH_GOLDEN_RATIO; | |
387 | c += rnd; | |
388 | __jhash_mix(a, b, c); | |
389 | ||
390 | a += raddr->s6_addr32[3]; | |
391 | b += (u32) rport; | |
392 | __jhash_mix(a, b, c); | |
393 | ||
394 | return c & (TCP_SYNQ_HSIZE - 1); | |
395 | } | |
396 | ||
397 | static struct open_request *tcp_v6_search_req(struct tcp_sock *tp, | |
398 | struct open_request ***prevp, | |
399 | __u16 rport, | |
400 | struct in6_addr *raddr, | |
401 | struct in6_addr *laddr, | |
402 | int iif) | |
403 | { | |
404 | struct tcp_listen_opt *lopt = tp->listen_opt; | |
405 | struct open_request *req, **prev; | |
406 | ||
407 | for (prev = &lopt->syn_table[tcp_v6_synq_hash(raddr, rport, lopt->hash_rnd)]; | |
408 | (req = *prev) != NULL; | |
409 | prev = &req->dl_next) { | |
410 | if (req->rmt_port == rport && | |
411 | req->class->family == AF_INET6 && | |
412 | ipv6_addr_equal(&req->af.v6_req.rmt_addr, raddr) && | |
413 | ipv6_addr_equal(&req->af.v6_req.loc_addr, laddr) && | |
414 | (!req->af.v6_req.iif || req->af.v6_req.iif == iif)) { | |
415 | BUG_TRAP(req->sk == NULL); | |
416 | *prevp = prev; | |
417 | return req; | |
418 | } | |
419 | } | |
420 | ||
421 | return NULL; | |
422 | } | |
423 | ||
424 | static __inline__ u16 tcp_v6_check(struct tcphdr *th, int len, | |
425 | struct in6_addr *saddr, | |
426 | struct in6_addr *daddr, | |
427 | unsigned long base) | |
428 | { | |
429 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
430 | } | |
431 | ||
432 | static __u32 tcp_v6_init_sequence(struct sock *sk, struct sk_buff *skb) | |
433 | { | |
434 | if (skb->protocol == htons(ETH_P_IPV6)) { | |
435 | return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32, | |
436 | skb->nh.ipv6h->saddr.s6_addr32, | |
437 | skb->h.th->dest, | |
438 | skb->h.th->source); | |
439 | } else { | |
440 | return secure_tcp_sequence_number(skb->nh.iph->daddr, | |
441 | skb->nh.iph->saddr, | |
442 | skb->h.th->dest, | |
443 | skb->h.th->source); | |
444 | } | |
445 | } | |
446 | ||
447 | static int __tcp_v6_check_established(struct sock *sk, __u16 lport, | |
448 | struct tcp_tw_bucket **twp) | |
449 | { | |
450 | struct inet_sock *inet = inet_sk(sk); | |
451 | struct ipv6_pinfo *np = inet6_sk(sk); | |
452 | struct in6_addr *daddr = &np->rcv_saddr; | |
453 | struct in6_addr *saddr = &np->daddr; | |
454 | int dif = sk->sk_bound_dev_if; | |
455 | u32 ports = TCP_COMBINED_PORTS(inet->dport, lport); | |
456 | int hash = tcp_v6_hashfn(daddr, inet->num, saddr, inet->dport); | |
457 | struct tcp_ehash_bucket *head = &tcp_ehash[hash]; | |
458 | struct sock *sk2; | |
459 | struct hlist_node *node; | |
460 | struct tcp_tw_bucket *tw; | |
461 | ||
462 | write_lock(&head->lock); | |
463 | ||
464 | /* Check TIME-WAIT sockets first. */ | |
465 | sk_for_each(sk2, node, &(head + tcp_ehash_size)->chain) { | |
466 | tw = (struct tcp_tw_bucket*)sk2; | |
467 | ||
468 | if(*((__u32 *)&(tw->tw_dport)) == ports && | |
469 | sk2->sk_family == PF_INET6 && | |
470 | ipv6_addr_equal(&tw->tw_v6_daddr, saddr) && | |
471 | ipv6_addr_equal(&tw->tw_v6_rcv_saddr, daddr) && | |
472 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) { | |
473 | struct tcp_sock *tp = tcp_sk(sk); | |
474 | ||
475 | if (tw->tw_ts_recent_stamp && | |
476 | (!twp || (sysctl_tcp_tw_reuse && | |
477 | xtime.tv_sec - | |
478 | tw->tw_ts_recent_stamp > 1))) { | |
479 | /* See comment in tcp_ipv4.c */ | |
480 | tp->write_seq = tw->tw_snd_nxt + 65535 + 2; | |
481 | if (!tp->write_seq) | |
482 | tp->write_seq = 1; | |
483 | tp->rx_opt.ts_recent = tw->tw_ts_recent; | |
484 | tp->rx_opt.ts_recent_stamp = tw->tw_ts_recent_stamp; | |
485 | sock_hold(sk2); | |
486 | goto unique; | |
487 | } else | |
488 | goto not_unique; | |
489 | } | |
490 | } | |
491 | tw = NULL; | |
492 | ||
493 | /* And established part... */ | |
494 | sk_for_each(sk2, node, &head->chain) { | |
495 | if(TCP_IPV6_MATCH(sk2, saddr, daddr, ports, dif)) | |
496 | goto not_unique; | |
497 | } | |
498 | ||
499 | unique: | |
500 | BUG_TRAP(sk_unhashed(sk)); | |
501 | __sk_add_node(sk, &head->chain); | |
502 | sk->sk_hashent = hash; | |
503 | sock_prot_inc_use(sk->sk_prot); | |
504 | write_unlock(&head->lock); | |
505 | ||
506 | if (twp) { | |
507 | *twp = tw; | |
508 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); | |
509 | } else if (tw) { | |
510 | /* Silly. Should hash-dance instead... */ | |
511 | tcp_tw_deschedule(tw); | |
512 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); | |
513 | ||
514 | tcp_tw_put(tw); | |
515 | } | |
516 | return 0; | |
517 | ||
518 | not_unique: | |
519 | write_unlock(&head->lock); | |
520 | return -EADDRNOTAVAIL; | |
521 | } | |
522 | ||
523 | static inline u32 tcpv6_port_offset(const struct sock *sk) | |
524 | { | |
525 | const struct inet_sock *inet = inet_sk(sk); | |
526 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
527 | ||
528 | return secure_tcpv6_port_ephemeral(np->rcv_saddr.s6_addr32, | |
529 | np->daddr.s6_addr32, | |
530 | inet->dport); | |
531 | } | |
532 | ||
533 | static int tcp_v6_hash_connect(struct sock *sk) | |
534 | { | |
535 | unsigned short snum = inet_sk(sk)->num; | |
536 | struct tcp_bind_hashbucket *head; | |
537 | struct tcp_bind_bucket *tb; | |
538 | int ret; | |
539 | ||
540 | if (!snum) { | |
541 | int low = sysctl_local_port_range[0]; | |
542 | int high = sysctl_local_port_range[1]; | |
543 | int range = high - low; | |
544 | int i; | |
545 | int port; | |
546 | static u32 hint; | |
547 | u32 offset = hint + tcpv6_port_offset(sk); | |
548 | struct hlist_node *node; | |
549 | struct tcp_tw_bucket *tw = NULL; | |
550 | ||
551 | local_bh_disable(); | |
552 | for (i = 1; i <= range; i++) { | |
553 | port = low + (i + offset) % range; | |
554 | head = &tcp_bhash[tcp_bhashfn(port)]; | |
555 | spin_lock(&head->lock); | |
556 | ||
557 | /* Does not bother with rcv_saddr checks, | |
558 | * because the established check is already | |
559 | * unique enough. | |
560 | */ | |
561 | tb_for_each(tb, node, &head->chain) { | |
562 | if (tb->port == port) { | |
563 | BUG_TRAP(!hlist_empty(&tb->owners)); | |
564 | if (tb->fastreuse >= 0) | |
565 | goto next_port; | |
566 | if (!__tcp_v6_check_established(sk, | |
567 | port, | |
568 | &tw)) | |
569 | goto ok; | |
570 | goto next_port; | |
571 | } | |
572 | } | |
573 | ||
574 | tb = tcp_bucket_create(head, port); | |
575 | if (!tb) { | |
576 | spin_unlock(&head->lock); | |
577 | break; | |
578 | } | |
579 | tb->fastreuse = -1; | |
580 | goto ok; | |
581 | ||
582 | next_port: | |
583 | spin_unlock(&head->lock); | |
584 | } | |
585 | local_bh_enable(); | |
586 | ||
587 | return -EADDRNOTAVAIL; | |
588 | ||
589 | ok: | |
590 | hint += i; | |
591 | ||
592 | /* Head lock still held and bh's disabled */ | |
593 | tcp_bind_hash(sk, tb, port); | |
594 | if (sk_unhashed(sk)) { | |
595 | inet_sk(sk)->sport = htons(port); | |
596 | __tcp_v6_hash(sk); | |
597 | } | |
598 | spin_unlock(&head->lock); | |
599 | ||
600 | if (tw) { | |
601 | tcp_tw_deschedule(tw); | |
602 | tcp_tw_put(tw); | |
603 | } | |
604 | ||
605 | ret = 0; | |
606 | goto out; | |
607 | } | |
608 | ||
609 | head = &tcp_bhash[tcp_bhashfn(snum)]; | |
610 | tb = tcp_sk(sk)->bind_hash; | |
611 | spin_lock_bh(&head->lock); | |
612 | ||
613 | if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) { | |
614 | __tcp_v6_hash(sk); | |
615 | spin_unlock_bh(&head->lock); | |
616 | return 0; | |
617 | } else { | |
618 | spin_unlock(&head->lock); | |
619 | /* No definite answer... Walk to established hash table */ | |
620 | ret = __tcp_v6_check_established(sk, snum, NULL); | |
621 | out: | |
622 | local_bh_enable(); | |
623 | return ret; | |
624 | } | |
625 | } | |
626 | ||
627 | static __inline__ int tcp_v6_iif(struct sk_buff *skb) | |
628 | { | |
629 | return IP6CB(skb)->iif; | |
630 | } | |
631 | ||
632 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, | |
633 | int addr_len) | |
634 | { | |
635 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
636 | struct inet_sock *inet = inet_sk(sk); | |
637 | struct ipv6_pinfo *np = inet6_sk(sk); | |
638 | struct tcp_sock *tp = tcp_sk(sk); | |
639 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
640 | struct flowi fl; | |
641 | struct dst_entry *dst; | |
642 | int addr_type; | |
643 | int err; | |
644 | ||
645 | if (addr_len < SIN6_LEN_RFC2133) | |
646 | return -EINVAL; | |
647 | ||
648 | if (usin->sin6_family != AF_INET6) | |
649 | return(-EAFNOSUPPORT); | |
650 | ||
651 | memset(&fl, 0, sizeof(fl)); | |
652 | ||
653 | if (np->sndflow) { | |
654 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
655 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
656 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
657 | struct ip6_flowlabel *flowlabel; | |
658 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
659 | if (flowlabel == NULL) | |
660 | return -EINVAL; | |
661 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
662 | fl6_sock_release(flowlabel); | |
663 | } | |
664 | } | |
665 | ||
666 | /* | |
667 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
668 | */ | |
669 | ||
670 | if(ipv6_addr_any(&usin->sin6_addr)) | |
671 | usin->sin6_addr.s6_addr[15] = 0x1; | |
672 | ||
673 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
674 | ||
675 | if(addr_type & IPV6_ADDR_MULTICAST) | |
676 | return -ENETUNREACH; | |
677 | ||
678 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
679 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
680 | usin->sin6_scope_id) { | |
681 | /* If interface is set while binding, indices | |
682 | * must coincide. | |
683 | */ | |
684 | if (sk->sk_bound_dev_if && | |
685 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
686 | return -EINVAL; | |
687 | ||
688 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
689 | } | |
690 | ||
691 | /* Connect to link-local address requires an interface */ | |
692 | if (!sk->sk_bound_dev_if) | |
693 | return -EINVAL; | |
694 | } | |
695 | ||
696 | if (tp->rx_opt.ts_recent_stamp && | |
697 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
698 | tp->rx_opt.ts_recent = 0; | |
699 | tp->rx_opt.ts_recent_stamp = 0; | |
700 | tp->write_seq = 0; | |
701 | } | |
702 | ||
703 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
704 | np->flow_label = fl.fl6_flowlabel; | |
705 | ||
706 | /* | |
707 | * TCP over IPv4 | |
708 | */ | |
709 | ||
710 | if (addr_type == IPV6_ADDR_MAPPED) { | |
711 | u32 exthdrlen = tp->ext_header_len; | |
712 | struct sockaddr_in sin; | |
713 | ||
714 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
715 | ||
716 | if (__ipv6_only_sock(sk)) | |
717 | return -ENETUNREACH; | |
718 | ||
719 | sin.sin_family = AF_INET; | |
720 | sin.sin_port = usin->sin6_port; | |
721 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
722 | ||
723 | tp->af_specific = &ipv6_mapped; | |
724 | sk->sk_backlog_rcv = tcp_v4_do_rcv; | |
725 | ||
726 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
727 | ||
728 | if (err) { | |
729 | tp->ext_header_len = exthdrlen; | |
730 | tp->af_specific = &ipv6_specific; | |
731 | sk->sk_backlog_rcv = tcp_v6_do_rcv; | |
732 | goto failure; | |
733 | } else { | |
734 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
735 | inet->saddr); | |
736 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
737 | inet->rcv_saddr); | |
738 | } | |
739 | ||
740 | return err; | |
741 | } | |
742 | ||
743 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
744 | saddr = &np->rcv_saddr; | |
745 | ||
746 | fl.proto = IPPROTO_TCP; | |
747 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
748 | ipv6_addr_copy(&fl.fl6_src, | |
749 | (saddr ? saddr : &np->saddr)); | |
750 | fl.oif = sk->sk_bound_dev_if; | |
751 | fl.fl_ip_dport = usin->sin6_port; | |
752 | fl.fl_ip_sport = inet->sport; | |
753 | ||
754 | if (np->opt && np->opt->srcrt) { | |
755 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
756 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
757 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
758 | final_p = &final; | |
759 | } | |
760 | ||
761 | err = ip6_dst_lookup(sk, &dst, &fl); | |
762 | if (err) | |
763 | goto failure; | |
764 | if (final_p) | |
765 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
766 | ||
767 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
768 | dst_release(dst); | |
769 | goto failure; | |
770 | } | |
771 | ||
772 | if (saddr == NULL) { | |
773 | saddr = &fl.fl6_src; | |
774 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
775 | } | |
776 | ||
777 | /* set the source address */ | |
778 | ipv6_addr_copy(&np->saddr, saddr); | |
779 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
780 | ||
781 | ip6_dst_store(sk, dst, NULL); | |
782 | sk->sk_route_caps = dst->dev->features & | |
783 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
784 | ||
785 | tp->ext_header_len = 0; | |
786 | if (np->opt) | |
787 | tp->ext_header_len = np->opt->opt_flen + np->opt->opt_nflen; | |
788 | ||
789 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
790 | ||
791 | inet->dport = usin->sin6_port; | |
792 | ||
793 | tcp_set_state(sk, TCP_SYN_SENT); | |
794 | err = tcp_v6_hash_connect(sk); | |
795 | if (err) | |
796 | goto late_failure; | |
797 | ||
798 | if (!tp->write_seq) | |
799 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
800 | np->daddr.s6_addr32, | |
801 | inet->sport, | |
802 | inet->dport); | |
803 | ||
804 | err = tcp_connect(sk); | |
805 | if (err) | |
806 | goto late_failure; | |
807 | ||
808 | return 0; | |
809 | ||
810 | late_failure: | |
811 | tcp_set_state(sk, TCP_CLOSE); | |
812 | __sk_dst_reset(sk); | |
813 | failure: | |
814 | inet->dport = 0; | |
815 | sk->sk_route_caps = 0; | |
816 | return err; | |
817 | } | |
818 | ||
819 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
820 | int type, int code, int offset, __u32 info) | |
821 | { | |
822 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
823 | struct tcphdr *th = (struct tcphdr *)(skb->data+offset); | |
824 | struct ipv6_pinfo *np; | |
825 | struct sock *sk; | |
826 | int err; | |
827 | struct tcp_sock *tp; | |
828 | __u32 seq; | |
829 | ||
830 | sk = tcp_v6_lookup(&hdr->daddr, th->dest, &hdr->saddr, th->source, skb->dev->ifindex); | |
831 | ||
832 | if (sk == NULL) { | |
833 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
834 | return; | |
835 | } | |
836 | ||
837 | if (sk->sk_state == TCP_TIME_WAIT) { | |
838 | tcp_tw_put((struct tcp_tw_bucket*)sk); | |
839 | return; | |
840 | } | |
841 | ||
842 | bh_lock_sock(sk); | |
843 | if (sock_owned_by_user(sk)) | |
844 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
845 | ||
846 | if (sk->sk_state == TCP_CLOSE) | |
847 | goto out; | |
848 | ||
849 | tp = tcp_sk(sk); | |
850 | seq = ntohl(th->seq); | |
851 | if (sk->sk_state != TCP_LISTEN && | |
852 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
853 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
854 | goto out; | |
855 | } | |
856 | ||
857 | np = inet6_sk(sk); | |
858 | ||
859 | if (type == ICMPV6_PKT_TOOBIG) { | |
860 | struct dst_entry *dst = NULL; | |
861 | ||
862 | if (sock_owned_by_user(sk)) | |
863 | goto out; | |
864 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
865 | goto out; | |
866 | ||
867 | /* icmp should have updated the destination cache entry */ | |
868 | dst = __sk_dst_check(sk, np->dst_cookie); | |
869 | ||
870 | if (dst == NULL) { | |
871 | struct inet_sock *inet = inet_sk(sk); | |
872 | struct flowi fl; | |
873 | ||
874 | /* BUGGG_FUTURE: Again, it is not clear how | |
875 | to handle rthdr case. Ignore this complexity | |
876 | for now. | |
877 | */ | |
878 | memset(&fl, 0, sizeof(fl)); | |
879 | fl.proto = IPPROTO_TCP; | |
880 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
881 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
882 | fl.oif = sk->sk_bound_dev_if; | |
883 | fl.fl_ip_dport = inet->dport; | |
884 | fl.fl_ip_sport = inet->sport; | |
885 | ||
886 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
887 | sk->sk_err_soft = -err; | |
888 | goto out; | |
889 | } | |
890 | ||
891 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
892 | sk->sk_err_soft = -err; | |
893 | goto out; | |
894 | } | |
895 | ||
896 | } else | |
897 | dst_hold(dst); | |
898 | ||
899 | if (tp->pmtu_cookie > dst_mtu(dst)) { | |
900 | tcp_sync_mss(sk, dst_mtu(dst)); | |
901 | tcp_simple_retransmit(sk); | |
902 | } /* else let the usual retransmit timer handle it */ | |
903 | dst_release(dst); | |
904 | goto out; | |
905 | } | |
906 | ||
907 | icmpv6_err_convert(type, code, &err); | |
908 | ||
909 | /* Might be for an open_request */ | |
910 | switch (sk->sk_state) { | |
911 | struct open_request *req, **prev; | |
912 | case TCP_LISTEN: | |
913 | if (sock_owned_by_user(sk)) | |
914 | goto out; | |
915 | ||
916 | req = tcp_v6_search_req(tp, &prev, th->dest, &hdr->daddr, | |
917 | &hdr->saddr, tcp_v6_iif(skb)); | |
918 | if (!req) | |
919 | goto out; | |
920 | ||
921 | /* ICMPs are not backlogged, hence we cannot get | |
922 | * an established socket here. | |
923 | */ | |
924 | BUG_TRAP(req->sk == NULL); | |
925 | ||
926 | if (seq != req->snt_isn) { | |
927 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
928 | goto out; | |
929 | } | |
930 | ||
931 | tcp_synq_drop(sk, req, prev); | |
932 | goto out; | |
933 | ||
934 | case TCP_SYN_SENT: | |
935 | case TCP_SYN_RECV: /* Cannot happen. | |
936 | It can, it SYNs are crossed. --ANK */ | |
937 | if (!sock_owned_by_user(sk)) { | |
938 | TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS); | |
939 | sk->sk_err = err; | |
940 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
941 | ||
942 | tcp_done(sk); | |
943 | } else | |
944 | sk->sk_err_soft = err; | |
945 | goto out; | |
946 | } | |
947 | ||
948 | if (!sock_owned_by_user(sk) && np->recverr) { | |
949 | sk->sk_err = err; | |
950 | sk->sk_error_report(sk); | |
951 | } else | |
952 | sk->sk_err_soft = err; | |
953 | ||
954 | out: | |
955 | bh_unlock_sock(sk); | |
956 | sock_put(sk); | |
957 | } | |
958 | ||
959 | ||
960 | static int tcp_v6_send_synack(struct sock *sk, struct open_request *req, | |
961 | struct dst_entry *dst) | |
962 | { | |
963 | struct ipv6_pinfo *np = inet6_sk(sk); | |
964 | struct sk_buff * skb; | |
965 | struct ipv6_txoptions *opt = NULL; | |
966 | struct in6_addr * final_p = NULL, final; | |
967 | struct flowi fl; | |
968 | int err = -1; | |
969 | ||
970 | memset(&fl, 0, sizeof(fl)); | |
971 | fl.proto = IPPROTO_TCP; | |
972 | ipv6_addr_copy(&fl.fl6_dst, &req->af.v6_req.rmt_addr); | |
973 | ipv6_addr_copy(&fl.fl6_src, &req->af.v6_req.loc_addr); | |
974 | fl.fl6_flowlabel = 0; | |
975 | fl.oif = req->af.v6_req.iif; | |
976 | fl.fl_ip_dport = req->rmt_port; | |
977 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
978 | ||
979 | if (dst == NULL) { | |
980 | opt = np->opt; | |
981 | if (opt == NULL && | |
982 | np->rxopt.bits.srcrt == 2 && | |
983 | req->af.v6_req.pktopts) { | |
984 | struct sk_buff *pktopts = req->af.v6_req.pktopts; | |
985 | struct inet6_skb_parm *rxopt = IP6CB(pktopts); | |
986 | if (rxopt->srcrt) | |
987 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr*)(pktopts->nh.raw + rxopt->srcrt)); | |
988 | } | |
989 | ||
990 | if (opt && opt->srcrt) { | |
991 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
992 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
993 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
994 | final_p = &final; | |
995 | } | |
996 | ||
997 | err = ip6_dst_lookup(sk, &dst, &fl); | |
998 | if (err) | |
999 | goto done; | |
1000 | if (final_p) | |
1001 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1002 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
1003 | goto done; | |
1004 | } | |
1005 | ||
1006 | skb = tcp_make_synack(sk, dst, req); | |
1007 | if (skb) { | |
1008 | struct tcphdr *th = skb->h.th; | |
1009 | ||
1010 | th->check = tcp_v6_check(th, skb->len, | |
1011 | &req->af.v6_req.loc_addr, &req->af.v6_req.rmt_addr, | |
1012 | csum_partial((char *)th, skb->len, skb->csum)); | |
1013 | ||
1014 | ipv6_addr_copy(&fl.fl6_dst, &req->af.v6_req.rmt_addr); | |
1015 | err = ip6_xmit(sk, skb, &fl, opt, 0); | |
1016 | if (err == NET_XMIT_CN) | |
1017 | err = 0; | |
1018 | } | |
1019 | ||
1020 | done: | |
1021 | dst_release(dst); | |
1022 | if (opt && opt != np->opt) | |
1023 | sock_kfree_s(sk, opt, opt->tot_len); | |
1024 | return err; | |
1025 | } | |
1026 | ||
1027 | static void tcp_v6_or_free(struct open_request *req) | |
1028 | { | |
1029 | if (req->af.v6_req.pktopts) | |
1030 | kfree_skb(req->af.v6_req.pktopts); | |
1031 | } | |
1032 | ||
1033 | static struct or_calltable or_ipv6 = { | |
1034 | .family = AF_INET6, | |
1035 | .rtx_syn_ack = tcp_v6_send_synack, | |
1036 | .send_ack = tcp_v6_or_send_ack, | |
1037 | .destructor = tcp_v6_or_free, | |
1038 | .send_reset = tcp_v6_send_reset | |
1039 | }; | |
1040 | ||
1041 | static int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) | |
1042 | { | |
1043 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1044 | struct inet6_skb_parm *opt = IP6CB(skb); | |
1045 | ||
1046 | if (np->rxopt.all) { | |
1047 | if ((opt->hop && np->rxopt.bits.hopopts) || | |
1048 | ((IPV6_FLOWINFO_MASK&*(u32*)skb->nh.raw) && | |
1049 | np->rxopt.bits.rxflow) || | |
1050 | (opt->srcrt && np->rxopt.bits.srcrt) || | |
1051 | ((opt->dst1 || opt->dst0) && np->rxopt.bits.dstopts)) | |
1052 | return 1; | |
1053 | } | |
1054 | return 0; | |
1055 | } | |
1056 | ||
1057 | ||
1058 | static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len, | |
1059 | struct sk_buff *skb) | |
1060 | { | |
1061 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1062 | ||
1063 | if (skb->ip_summed == CHECKSUM_HW) { | |
1064 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); | |
1065 | skb->csum = offsetof(struct tcphdr, check); | |
1066 | } else { | |
1067 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, | |
1068 | csum_partial((char *)th, th->doff<<2, | |
1069 | skb->csum)); | |
1070 | } | |
1071 | } | |
1072 | ||
1073 | ||
1074 | static void tcp_v6_send_reset(struct sk_buff *skb) | |
1075 | { | |
1076 | struct tcphdr *th = skb->h.th, *t1; | |
1077 | struct sk_buff *buff; | |
1078 | struct flowi fl; | |
1079 | ||
1080 | if (th->rst) | |
1081 | return; | |
1082 | ||
1083 | if (!ipv6_unicast_destination(skb)) | |
1084 | return; | |
1085 | ||
1086 | /* | |
1087 | * We need to grab some memory, and put together an RST, | |
1088 | * and then put it into the queue to be sent. | |
1089 | */ | |
1090 | ||
1091 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr), | |
1092 | GFP_ATOMIC); | |
1093 | if (buff == NULL) | |
1094 | return; | |
1095 | ||
1096 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr)); | |
1097 | ||
1098 | t1 = (struct tcphdr *) skb_push(buff,sizeof(struct tcphdr)); | |
1099 | ||
1100 | /* Swap the send and the receive. */ | |
1101 | memset(t1, 0, sizeof(*t1)); | |
1102 | t1->dest = th->source; | |
1103 | t1->source = th->dest; | |
1104 | t1->doff = sizeof(*t1)/4; | |
1105 | t1->rst = 1; | |
1106 | ||
1107 | if(th->ack) { | |
1108 | t1->seq = th->ack_seq; | |
1109 | } else { | |
1110 | t1->ack = 1; | |
1111 | t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin | |
1112 | + skb->len - (th->doff<<2)); | |
1113 | } | |
1114 | ||
1115 | buff->csum = csum_partial((char *)t1, sizeof(*t1), 0); | |
1116 | ||
1117 | memset(&fl, 0, sizeof(fl)); | |
1118 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); | |
1119 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); | |
1120 | ||
1121 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
1122 | sizeof(*t1), IPPROTO_TCP, | |
1123 | buff->csum); | |
1124 | ||
1125 | fl.proto = IPPROTO_TCP; | |
1126 | fl.oif = tcp_v6_iif(skb); | |
1127 | fl.fl_ip_dport = t1->dest; | |
1128 | fl.fl_ip_sport = t1->source; | |
1129 | ||
1130 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
1131 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
1132 | ||
1133 | if ((xfrm_lookup(&buff->dst, &fl, NULL, 0)) < 0) { | |
1134 | dst_release(buff->dst); | |
1135 | return; | |
1136 | } | |
1137 | ||
1138 | ip6_xmit(NULL, buff, &fl, NULL, 0); | |
1139 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
1140 | TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); | |
1141 | return; | |
1142 | } | |
1143 | ||
1144 | kfree_skb(buff); | |
1145 | } | |
1146 | ||
1147 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts) | |
1148 | { | |
1149 | struct tcphdr *th = skb->h.th, *t1; | |
1150 | struct sk_buff *buff; | |
1151 | struct flowi fl; | |
1152 | int tot_len = sizeof(struct tcphdr); | |
1153 | ||
1154 | if (ts) | |
1155 | tot_len += 3*4; | |
1156 | ||
1157 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, | |
1158 | GFP_ATOMIC); | |
1159 | if (buff == NULL) | |
1160 | return; | |
1161 | ||
1162 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); | |
1163 | ||
1164 | t1 = (struct tcphdr *) skb_push(buff,tot_len); | |
1165 | ||
1166 | /* Swap the send and the receive. */ | |
1167 | memset(t1, 0, sizeof(*t1)); | |
1168 | t1->dest = th->source; | |
1169 | t1->source = th->dest; | |
1170 | t1->doff = tot_len/4; | |
1171 | t1->seq = htonl(seq); | |
1172 | t1->ack_seq = htonl(ack); | |
1173 | t1->ack = 1; | |
1174 | t1->window = htons(win); | |
1175 | ||
1176 | if (ts) { | |
1177 | u32 *ptr = (u32*)(t1 + 1); | |
1178 | *ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
1179 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
1180 | *ptr++ = htonl(tcp_time_stamp); | |
1181 | *ptr = htonl(ts); | |
1182 | } | |
1183 | ||
1184 | buff->csum = csum_partial((char *)t1, tot_len, 0); | |
1185 | ||
1186 | memset(&fl, 0, sizeof(fl)); | |
1187 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); | |
1188 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); | |
1189 | ||
1190 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
1191 | tot_len, IPPROTO_TCP, | |
1192 | buff->csum); | |
1193 | ||
1194 | fl.proto = IPPROTO_TCP; | |
1195 | fl.oif = tcp_v6_iif(skb); | |
1196 | fl.fl_ip_dport = t1->dest; | |
1197 | fl.fl_ip_sport = t1->source; | |
1198 | ||
1199 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
1200 | if ((xfrm_lookup(&buff->dst, &fl, NULL, 0)) < 0) { | |
1201 | dst_release(buff->dst); | |
1202 | return; | |
1203 | } | |
1204 | ip6_xmit(NULL, buff, &fl, NULL, 0); | |
1205 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
1206 | return; | |
1207 | } | |
1208 | ||
1209 | kfree_skb(buff); | |
1210 | } | |
1211 | ||
1212 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1213 | { | |
1214 | struct tcp_tw_bucket *tw = (struct tcp_tw_bucket *)sk; | |
1215 | ||
1216 | tcp_v6_send_ack(skb, tw->tw_snd_nxt, tw->tw_rcv_nxt, | |
1217 | tw->tw_rcv_wnd >> tw->tw_rcv_wscale, tw->tw_ts_recent); | |
1218 | ||
1219 | tcp_tw_put(tw); | |
1220 | } | |
1221 | ||
1222 | static void tcp_v6_or_send_ack(struct sk_buff *skb, struct open_request *req) | |
1223 | { | |
1224 | tcp_v6_send_ack(skb, req->snt_isn+1, req->rcv_isn+1, req->rcv_wnd, req->ts_recent); | |
1225 | } | |
1226 | ||
1227 | ||
1228 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
1229 | { | |
1230 | struct open_request *req, **prev; | |
1231 | struct tcphdr *th = skb->h.th; | |
1232 | struct tcp_sock *tp = tcp_sk(sk); | |
1233 | struct sock *nsk; | |
1234 | ||
1235 | /* Find possible connection requests. */ | |
1236 | req = tcp_v6_search_req(tp, &prev, th->source, &skb->nh.ipv6h->saddr, | |
1237 | &skb->nh.ipv6h->daddr, tcp_v6_iif(skb)); | |
1238 | if (req) | |
1239 | return tcp_check_req(sk, skb, req, prev); | |
1240 | ||
1241 | nsk = __tcp_v6_lookup_established(&skb->nh.ipv6h->saddr, | |
1242 | th->source, | |
1243 | &skb->nh.ipv6h->daddr, | |
1244 | ntohs(th->dest), | |
1245 | tcp_v6_iif(skb)); | |
1246 | ||
1247 | if (nsk) { | |
1248 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1249 | bh_lock_sock(nsk); | |
1250 | return nsk; | |
1251 | } | |
1252 | tcp_tw_put((struct tcp_tw_bucket*)nsk); | |
1253 | return NULL; | |
1254 | } | |
1255 | ||
1256 | #if 0 /*def CONFIG_SYN_COOKIES*/ | |
1257 | if (!th->rst && !th->syn && th->ack) | |
1258 | sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt)); | |
1259 | #endif | |
1260 | return sk; | |
1261 | } | |
1262 | ||
1263 | static void tcp_v6_synq_add(struct sock *sk, struct open_request *req) | |
1264 | { | |
1265 | struct tcp_sock *tp = tcp_sk(sk); | |
1266 | struct tcp_listen_opt *lopt = tp->listen_opt; | |
1267 | u32 h = tcp_v6_synq_hash(&req->af.v6_req.rmt_addr, req->rmt_port, lopt->hash_rnd); | |
1268 | ||
1269 | req->sk = NULL; | |
1270 | req->expires = jiffies + TCP_TIMEOUT_INIT; | |
1271 | req->retrans = 0; | |
1272 | req->dl_next = lopt->syn_table[h]; | |
1273 | ||
1274 | write_lock(&tp->syn_wait_lock); | |
1275 | lopt->syn_table[h] = req; | |
1276 | write_unlock(&tp->syn_wait_lock); | |
1277 | ||
1278 | tcp_synq_added(sk); | |
1279 | } | |
1280 | ||
1281 | ||
1282 | /* FIXME: this is substantially similar to the ipv4 code. | |
1283 | * Can some kind of merge be done? -- erics | |
1284 | */ | |
1285 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1286 | { | |
1287 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1288 | struct tcp_options_received tmp_opt; | |
1289 | struct tcp_sock *tp = tcp_sk(sk); | |
1290 | struct open_request *req = NULL; | |
1291 | __u32 isn = TCP_SKB_CB(skb)->when; | |
1292 | ||
1293 | if (skb->protocol == htons(ETH_P_IP)) | |
1294 | return tcp_v4_conn_request(sk, skb); | |
1295 | ||
1296 | if (!ipv6_unicast_destination(skb)) | |
1297 | goto drop; | |
1298 | ||
1299 | /* | |
1300 | * There are no SYN attacks on IPv6, yet... | |
1301 | */ | |
1302 | if (tcp_synq_is_full(sk) && !isn) { | |
1303 | if (net_ratelimit()) | |
1304 | printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n"); | |
1305 | goto drop; | |
1306 | } | |
1307 | ||
1308 | if (sk_acceptq_is_full(sk) && tcp_synq_young(sk) > 1) | |
1309 | goto drop; | |
1310 | ||
1311 | req = tcp_openreq_alloc(); | |
1312 | if (req == NULL) | |
1313 | goto drop; | |
1314 | ||
1315 | tcp_clear_options(&tmp_opt); | |
1316 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1317 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
1318 | ||
1319 | tcp_parse_options(skb, &tmp_opt, 0); | |
1320 | ||
1321 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; | |
1322 | tcp_openreq_init(req, &tmp_opt, skb); | |
1323 | ||
1324 | req->class = &or_ipv6; | |
1325 | ipv6_addr_copy(&req->af.v6_req.rmt_addr, &skb->nh.ipv6h->saddr); | |
1326 | ipv6_addr_copy(&req->af.v6_req.loc_addr, &skb->nh.ipv6h->daddr); | |
1327 | TCP_ECN_create_request(req, skb->h.th); | |
1328 | req->af.v6_req.pktopts = NULL; | |
1329 | if (ipv6_opt_accepted(sk, skb) || | |
1330 | np->rxopt.bits.rxinfo || | |
1331 | np->rxopt.bits.rxhlim) { | |
1332 | atomic_inc(&skb->users); | |
1333 | req->af.v6_req.pktopts = skb; | |
1334 | } | |
1335 | req->af.v6_req.iif = sk->sk_bound_dev_if; | |
1336 | ||
1337 | /* So that link locals have meaning */ | |
1338 | if (!sk->sk_bound_dev_if && | |
1339 | ipv6_addr_type(&req->af.v6_req.rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1340 | req->af.v6_req.iif = tcp_v6_iif(skb); | |
1341 | ||
1342 | if (isn == 0) | |
1343 | isn = tcp_v6_init_sequence(sk,skb); | |
1344 | ||
1345 | req->snt_isn = isn; | |
1346 | ||
1347 | if (tcp_v6_send_synack(sk, req, NULL)) | |
1348 | goto drop; | |
1349 | ||
1350 | tcp_v6_synq_add(sk, req); | |
1351 | ||
1352 | return 0; | |
1353 | ||
1354 | drop: | |
1355 | if (req) | |
1356 | tcp_openreq_free(req); | |
1357 | ||
1358 | TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS); | |
1359 | return 0; /* don't send reset */ | |
1360 | } | |
1361 | ||
1362 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
1363 | struct open_request *req, | |
1364 | struct dst_entry *dst) | |
1365 | { | |
1366 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); | |
1367 | struct tcp6_sock *newtcp6sk; | |
1368 | struct inet_sock *newinet; | |
1369 | struct tcp_sock *newtp; | |
1370 | struct sock *newsk; | |
1371 | struct ipv6_txoptions *opt; | |
1372 | ||
1373 | if (skb->protocol == htons(ETH_P_IP)) { | |
1374 | /* | |
1375 | * v6 mapped | |
1376 | */ | |
1377 | ||
1378 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1379 | ||
1380 | if (newsk == NULL) | |
1381 | return NULL; | |
1382 | ||
1383 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1384 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1385 | ||
1386 | newinet = inet_sk(newsk); | |
1387 | newnp = inet6_sk(newsk); | |
1388 | newtp = tcp_sk(newsk); | |
1389 | ||
1390 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1391 | ||
1392 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
1393 | newinet->daddr); | |
1394 | ||
1395 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
1396 | newinet->saddr); | |
1397 | ||
1398 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1399 | ||
1400 | newtp->af_specific = &ipv6_mapped; | |
1401 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; | |
1402 | newnp->pktoptions = NULL; | |
1403 | newnp->opt = NULL; | |
1404 | newnp->mcast_oif = tcp_v6_iif(skb); | |
1405 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; | |
1406 | ||
1407 | /* Charge newly allocated IPv6 socket. Though it is mapped, | |
1408 | * it is IPv6 yet. | |
1409 | */ | |
1410 | #ifdef INET_REFCNT_DEBUG | |
1411 | atomic_inc(&inet6_sock_nr); | |
1412 | #endif | |
1413 | ||
1414 | /* It is tricky place. Until this moment IPv4 tcp | |
1415 | worked with IPv6 af_tcp.af_specific. | |
1416 | Sync it now. | |
1417 | */ | |
1418 | tcp_sync_mss(newsk, newtp->pmtu_cookie); | |
1419 | ||
1420 | return newsk; | |
1421 | } | |
1422 | ||
1423 | opt = np->opt; | |
1424 | ||
1425 | if (sk_acceptq_is_full(sk)) | |
1426 | goto out_overflow; | |
1427 | ||
1428 | if (np->rxopt.bits.srcrt == 2 && | |
1429 | opt == NULL && req->af.v6_req.pktopts) { | |
1430 | struct inet6_skb_parm *rxopt = IP6CB(req->af.v6_req.pktopts); | |
1431 | if (rxopt->srcrt) | |
1432 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr*)(req->af.v6_req.pktopts->nh.raw+rxopt->srcrt)); | |
1433 | } | |
1434 | ||
1435 | if (dst == NULL) { | |
1436 | struct in6_addr *final_p = NULL, final; | |
1437 | struct flowi fl; | |
1438 | ||
1439 | memset(&fl, 0, sizeof(fl)); | |
1440 | fl.proto = IPPROTO_TCP; | |
1441 | ipv6_addr_copy(&fl.fl6_dst, &req->af.v6_req.rmt_addr); | |
1442 | if (opt && opt->srcrt) { | |
1443 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1444 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1445 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1446 | final_p = &final; | |
1447 | } | |
1448 | ipv6_addr_copy(&fl.fl6_src, &req->af.v6_req.loc_addr); | |
1449 | fl.oif = sk->sk_bound_dev_if; | |
1450 | fl.fl_ip_dport = req->rmt_port; | |
1451 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
1452 | ||
1453 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1454 | goto out; | |
1455 | ||
1456 | if (final_p) | |
1457 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1458 | ||
1459 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
1460 | goto out; | |
1461 | } | |
1462 | ||
1463 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1464 | if (newsk == NULL) | |
1465 | goto out; | |
1466 | ||
1467 | /* Charge newly allocated IPv6 socket */ | |
1468 | #ifdef INET_REFCNT_DEBUG | |
1469 | atomic_inc(&inet6_sock_nr); | |
1470 | #endif | |
1471 | ||
1472 | ip6_dst_store(newsk, dst, NULL); | |
1473 | newsk->sk_route_caps = dst->dev->features & | |
1474 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1475 | ||
1476 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1477 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1478 | ||
1479 | newtp = tcp_sk(newsk); | |
1480 | newinet = inet_sk(newsk); | |
1481 | newnp = inet6_sk(newsk); | |
1482 | ||
1483 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1484 | ||
1485 | ipv6_addr_copy(&newnp->daddr, &req->af.v6_req.rmt_addr); | |
1486 | ipv6_addr_copy(&newnp->saddr, &req->af.v6_req.loc_addr); | |
1487 | ipv6_addr_copy(&newnp->rcv_saddr, &req->af.v6_req.loc_addr); | |
1488 | newsk->sk_bound_dev_if = req->af.v6_req.iif; | |
1489 | ||
1490 | /* Now IPv6 options... | |
1491 | ||
1492 | First: no IPv4 options. | |
1493 | */ | |
1494 | newinet->opt = NULL; | |
1495 | ||
1496 | /* Clone RX bits */ | |
1497 | newnp->rxopt.all = np->rxopt.all; | |
1498 | ||
1499 | /* Clone pktoptions received with SYN */ | |
1500 | newnp->pktoptions = NULL; | |
1501 | if (req->af.v6_req.pktopts) { | |
1502 | newnp->pktoptions = skb_clone(req->af.v6_req.pktopts, | |
1503 | GFP_ATOMIC); | |
1504 | kfree_skb(req->af.v6_req.pktopts); | |
1505 | req->af.v6_req.pktopts = NULL; | |
1506 | if (newnp->pktoptions) | |
1507 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1508 | } | |
1509 | newnp->opt = NULL; | |
1510 | newnp->mcast_oif = tcp_v6_iif(skb); | |
1511 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; | |
1512 | ||
1513 | /* Clone native IPv6 options from listening socket (if any) | |
1514 | ||
1515 | Yes, keeping reference count would be much more clever, | |
1516 | but we make one more one thing there: reattach optmem | |
1517 | to newsk. | |
1518 | */ | |
1519 | if (opt) { | |
1520 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1521 | if (opt != np->opt) | |
1522 | sock_kfree_s(sk, opt, opt->tot_len); | |
1523 | } | |
1524 | ||
1525 | newtp->ext_header_len = 0; | |
1526 | if (newnp->opt) | |
1527 | newtp->ext_header_len = newnp->opt->opt_nflen + | |
1528 | newnp->opt->opt_flen; | |
1529 | ||
1530 | tcp_sync_mss(newsk, dst_mtu(dst)); | |
1531 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1532 | tcp_initialize_rcv_mss(newsk); | |
1533 | ||
1534 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
1535 | ||
1536 | __tcp_v6_hash(newsk); | |
1537 | tcp_inherit_port(sk, newsk); | |
1538 | ||
1539 | return newsk; | |
1540 | ||
1541 | out_overflow: | |
1542 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
1543 | out: | |
1544 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
1545 | if (opt && opt != np->opt) | |
1546 | sock_kfree_s(sk, opt, opt->tot_len); | |
1547 | dst_release(dst); | |
1548 | return NULL; | |
1549 | } | |
1550 | ||
1551 | static int tcp_v6_checksum_init(struct sk_buff *skb) | |
1552 | { | |
1553 | if (skb->ip_summed == CHECKSUM_HW) { | |
1554 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1555 | if (!tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, | |
1556 | &skb->nh.ipv6h->daddr,skb->csum)) | |
1557 | return 0; | |
1558 | LIMIT_NETDEBUG(printk(KERN_DEBUG "hw tcp v6 csum failed\n")); | |
1559 | } | |
1560 | if (skb->len <= 76) { | |
1561 | if (tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, | |
1562 | &skb->nh.ipv6h->daddr,skb_checksum(skb, 0, skb->len, 0))) | |
1563 | return -1; | |
1564 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1565 | } else { | |
1566 | skb->csum = ~tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, | |
1567 | &skb->nh.ipv6h->daddr,0); | |
1568 | } | |
1569 | return 0; | |
1570 | } | |
1571 | ||
1572 | /* The socket must have it's spinlock held when we get | |
1573 | * here. | |
1574 | * | |
1575 | * We have a potential double-lock case here, so even when | |
1576 | * doing backlog processing we use the BH locking scheme. | |
1577 | * This is because we cannot sleep with the original spinlock | |
1578 | * held. | |
1579 | */ | |
1580 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1581 | { | |
1582 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1583 | struct tcp_sock *tp; | |
1584 | struct sk_buff *opt_skb = NULL; | |
1585 | ||
1586 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1587 | goes to IPv4 receive handler and backlogged. | |
1588 | From backlog it always goes here. Kerboom... | |
1589 | Fortunately, tcp_rcv_established and rcv_established | |
1590 | handle them correctly, but it is not case with | |
1591 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1592 | */ | |
1593 | ||
1594 | if (skb->protocol == htons(ETH_P_IP)) | |
1595 | return tcp_v4_do_rcv(sk, skb); | |
1596 | ||
1597 | if (sk_filter(sk, skb, 0)) | |
1598 | goto discard; | |
1599 | ||
1600 | /* | |
1601 | * socket locking is here for SMP purposes as backlog rcv | |
1602 | * is currently called with bh processing disabled. | |
1603 | */ | |
1604 | ||
1605 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1606 | ||
1607 | Yes, guys, it is the only place in our code, where we | |
1608 | may make it not affecting IPv4. | |
1609 | The rest of code is protocol independent, | |
1610 | and I do not like idea to uglify IPv4. | |
1611 | ||
1612 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1613 | looks not very well thought. For now we latch | |
1614 | options, received in the last packet, enqueued | |
1615 | by tcp. Feel free to propose better solution. | |
1616 | --ANK (980728) | |
1617 | */ | |
1618 | if (np->rxopt.all) | |
1619 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1620 | ||
1621 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1622 | TCP_CHECK_TIMER(sk); | |
1623 | if (tcp_rcv_established(sk, skb, skb->h.th, skb->len)) | |
1624 | goto reset; | |
1625 | TCP_CHECK_TIMER(sk); | |
1626 | if (opt_skb) | |
1627 | goto ipv6_pktoptions; | |
1628 | return 0; | |
1629 | } | |
1630 | ||
1631 | if (skb->len < (skb->h.th->doff<<2) || tcp_checksum_complete(skb)) | |
1632 | goto csum_err; | |
1633 | ||
1634 | if (sk->sk_state == TCP_LISTEN) { | |
1635 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); | |
1636 | if (!nsk) | |
1637 | goto discard; | |
1638 | ||
1639 | /* | |
1640 | * Queue it on the new socket if the new socket is active, | |
1641 | * otherwise we just shortcircuit this and continue with | |
1642 | * the new socket.. | |
1643 | */ | |
1644 | if(nsk != sk) { | |
1645 | if (tcp_child_process(sk, nsk, skb)) | |
1646 | goto reset; | |
1647 | if (opt_skb) | |
1648 | __kfree_skb(opt_skb); | |
1649 | return 0; | |
1650 | } | |
1651 | } | |
1652 | ||
1653 | TCP_CHECK_TIMER(sk); | |
1654 | if (tcp_rcv_state_process(sk, skb, skb->h.th, skb->len)) | |
1655 | goto reset; | |
1656 | TCP_CHECK_TIMER(sk); | |
1657 | if (opt_skb) | |
1658 | goto ipv6_pktoptions; | |
1659 | return 0; | |
1660 | ||
1661 | reset: | |
1662 | tcp_v6_send_reset(skb); | |
1663 | discard: | |
1664 | if (opt_skb) | |
1665 | __kfree_skb(opt_skb); | |
1666 | kfree_skb(skb); | |
1667 | return 0; | |
1668 | csum_err: | |
1669 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1670 | goto discard; | |
1671 | ||
1672 | ||
1673 | ipv6_pktoptions: | |
1674 | /* Do you ask, what is it? | |
1675 | ||
1676 | 1. skb was enqueued by tcp. | |
1677 | 2. skb is added to tail of read queue, rather than out of order. | |
1678 | 3. socket is not in passive state. | |
1679 | 4. Finally, it really contains options, which user wants to receive. | |
1680 | */ | |
1681 | tp = tcp_sk(sk); | |
1682 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1683 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
1684 | if (np->rxopt.bits.rxinfo) | |
1685 | np->mcast_oif = tcp_v6_iif(opt_skb); | |
1686 | if (np->rxopt.bits.rxhlim) | |
1687 | np->mcast_hops = opt_skb->nh.ipv6h->hop_limit; | |
1688 | if (ipv6_opt_accepted(sk, opt_skb)) { | |
1689 | skb_set_owner_r(opt_skb, sk); | |
1690 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1691 | } else { | |
1692 | __kfree_skb(opt_skb); | |
1693 | opt_skb = xchg(&np->pktoptions, NULL); | |
1694 | } | |
1695 | } | |
1696 | ||
1697 | if (opt_skb) | |
1698 | kfree_skb(opt_skb); | |
1699 | return 0; | |
1700 | } | |
1701 | ||
1702 | static int tcp_v6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) | |
1703 | { | |
1704 | struct sk_buff *skb = *pskb; | |
1705 | struct tcphdr *th; | |
1706 | struct sock *sk; | |
1707 | int ret; | |
1708 | ||
1709 | if (skb->pkt_type != PACKET_HOST) | |
1710 | goto discard_it; | |
1711 | ||
1712 | /* | |
1713 | * Count it even if it's bad. | |
1714 | */ | |
1715 | TCP_INC_STATS_BH(TCP_MIB_INSEGS); | |
1716 | ||
1717 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1718 | goto discard_it; | |
1719 | ||
1720 | th = skb->h.th; | |
1721 | ||
1722 | if (th->doff < sizeof(struct tcphdr)/4) | |
1723 | goto bad_packet; | |
1724 | if (!pskb_may_pull(skb, th->doff*4)) | |
1725 | goto discard_it; | |
1726 | ||
1727 | if ((skb->ip_summed != CHECKSUM_UNNECESSARY && | |
1728 | tcp_v6_checksum_init(skb) < 0)) | |
1729 | goto bad_packet; | |
1730 | ||
1731 | th = skb->h.th; | |
1732 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1733 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1734 | skb->len - th->doff*4); | |
1735 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1736 | TCP_SKB_CB(skb)->when = 0; | |
1737 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(skb->nh.ipv6h); | |
1738 | TCP_SKB_CB(skb)->sacked = 0; | |
1739 | ||
1740 | sk = __tcp_v6_lookup(&skb->nh.ipv6h->saddr, th->source, | |
1741 | &skb->nh.ipv6h->daddr, ntohs(th->dest), tcp_v6_iif(skb)); | |
1742 | ||
1743 | if (!sk) | |
1744 | goto no_tcp_socket; | |
1745 | ||
1746 | process: | |
1747 | if (sk->sk_state == TCP_TIME_WAIT) | |
1748 | goto do_time_wait; | |
1749 | ||
1750 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1751 | goto discard_and_relse; | |
1752 | ||
1753 | if (sk_filter(sk, skb, 0)) | |
1754 | goto discard_and_relse; | |
1755 | ||
1756 | skb->dev = NULL; | |
1757 | ||
1758 | bh_lock_sock(sk); | |
1759 | ret = 0; | |
1760 | if (!sock_owned_by_user(sk)) { | |
1761 | if (!tcp_prequeue(sk, skb)) | |
1762 | ret = tcp_v6_do_rcv(sk, skb); | |
1763 | } else | |
1764 | sk_add_backlog(sk, skb); | |
1765 | bh_unlock_sock(sk); | |
1766 | ||
1767 | sock_put(sk); | |
1768 | return ret ? -1 : 0; | |
1769 | ||
1770 | no_tcp_socket: | |
1771 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1772 | goto discard_it; | |
1773 | ||
1774 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1775 | bad_packet: | |
1776 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1777 | } else { | |
1778 | tcp_v6_send_reset(skb); | |
1779 | } | |
1780 | ||
1781 | discard_it: | |
1782 | ||
1783 | /* | |
1784 | * Discard frame | |
1785 | */ | |
1786 | ||
1787 | kfree_skb(skb); | |
1788 | return 0; | |
1789 | ||
1790 | discard_and_relse: | |
1791 | sock_put(sk); | |
1792 | goto discard_it; | |
1793 | ||
1794 | do_time_wait: | |
1795 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
1796 | tcp_tw_put((struct tcp_tw_bucket *) sk); | |
1797 | goto discard_it; | |
1798 | } | |
1799 | ||
1800 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1801 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1802 | tcp_tw_put((struct tcp_tw_bucket *) sk); | |
1803 | goto discard_it; | |
1804 | } | |
1805 | ||
1806 | switch(tcp_timewait_state_process((struct tcp_tw_bucket *)sk, | |
1807 | skb, th, skb->len)) { | |
1808 | case TCP_TW_SYN: | |
1809 | { | |
1810 | struct sock *sk2; | |
1811 | ||
1812 | sk2 = tcp_v6_lookup_listener(&skb->nh.ipv6h->daddr, ntohs(th->dest), tcp_v6_iif(skb)); | |
1813 | if (sk2 != NULL) { | |
1814 | tcp_tw_deschedule((struct tcp_tw_bucket *)sk); | |
1815 | tcp_tw_put((struct tcp_tw_bucket *)sk); | |
1816 | sk = sk2; | |
1817 | goto process; | |
1818 | } | |
1819 | /* Fall through to ACK */ | |
1820 | } | |
1821 | case TCP_TW_ACK: | |
1822 | tcp_v6_timewait_ack(sk, skb); | |
1823 | break; | |
1824 | case TCP_TW_RST: | |
1825 | goto no_tcp_socket; | |
1826 | case TCP_TW_SUCCESS:; | |
1827 | } | |
1828 | goto discard_it; | |
1829 | } | |
1830 | ||
1831 | static int tcp_v6_rebuild_header(struct sock *sk) | |
1832 | { | |
1833 | int err; | |
1834 | struct dst_entry *dst; | |
1835 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1836 | ||
1837 | dst = __sk_dst_check(sk, np->dst_cookie); | |
1838 | ||
1839 | if (dst == NULL) { | |
1840 | struct inet_sock *inet = inet_sk(sk); | |
1841 | struct in6_addr *final_p = NULL, final; | |
1842 | struct flowi fl; | |
1843 | ||
1844 | memset(&fl, 0, sizeof(fl)); | |
1845 | fl.proto = IPPROTO_TCP; | |
1846 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
1847 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
1848 | fl.fl6_flowlabel = np->flow_label; | |
1849 | fl.oif = sk->sk_bound_dev_if; | |
1850 | fl.fl_ip_dport = inet->dport; | |
1851 | fl.fl_ip_sport = inet->sport; | |
1852 | ||
1853 | if (np->opt && np->opt->srcrt) { | |
1854 | struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; | |
1855 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1856 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1857 | final_p = &final; | |
1858 | } | |
1859 | ||
1860 | err = ip6_dst_lookup(sk, &dst, &fl); | |
1861 | if (err) { | |
1862 | sk->sk_route_caps = 0; | |
1863 | return err; | |
1864 | } | |
1865 | if (final_p) | |
1866 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1867 | ||
1868 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
1869 | sk->sk_err_soft = -err; | |
1870 | dst_release(dst); | |
1871 | return err; | |
1872 | } | |
1873 | ||
1874 | ip6_dst_store(sk, dst, NULL); | |
1875 | sk->sk_route_caps = dst->dev->features & | |
1876 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1877 | } | |
1878 | ||
1879 | return 0; | |
1880 | } | |
1881 | ||
1882 | static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok) | |
1883 | { | |
1884 | struct sock *sk = skb->sk; | |
1885 | struct inet_sock *inet = inet_sk(sk); | |
1886 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1887 | struct flowi fl; | |
1888 | struct dst_entry *dst; | |
1889 | struct in6_addr *final_p = NULL, final; | |
1890 | ||
1891 | memset(&fl, 0, sizeof(fl)); | |
1892 | fl.proto = IPPROTO_TCP; | |
1893 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
1894 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
1895 | fl.fl6_flowlabel = np->flow_label; | |
1896 | IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); | |
1897 | fl.oif = sk->sk_bound_dev_if; | |
1898 | fl.fl_ip_sport = inet->sport; | |
1899 | fl.fl_ip_dport = inet->dport; | |
1900 | ||
1901 | if (np->opt && np->opt->srcrt) { | |
1902 | struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; | |
1903 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1904 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1905 | final_p = &final; | |
1906 | } | |
1907 | ||
1908 | dst = __sk_dst_check(sk, np->dst_cookie); | |
1909 | ||
1910 | if (dst == NULL) { | |
1911 | int err = ip6_dst_lookup(sk, &dst, &fl); | |
1912 | ||
1913 | if (err) { | |
1914 | sk->sk_err_soft = -err; | |
1915 | return err; | |
1916 | } | |
1917 | ||
1918 | if (final_p) | |
1919 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1920 | ||
1921 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
1922 | sk->sk_route_caps = 0; | |
1923 | dst_release(dst); | |
1924 | return err; | |
1925 | } | |
1926 | ||
1927 | ip6_dst_store(sk, dst, NULL); | |
1928 | sk->sk_route_caps = dst->dev->features & | |
1929 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1930 | } | |
1931 | ||
1932 | skb->dst = dst_clone(dst); | |
1933 | ||
1934 | /* Restore final destination back after routing done */ | |
1935 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
1936 | ||
1937 | return ip6_xmit(sk, skb, &fl, np->opt, 0); | |
1938 | } | |
1939 | ||
1940 | static void v6_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) | |
1941 | { | |
1942 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1943 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; | |
1944 | ||
1945 | sin6->sin6_family = AF_INET6; | |
1946 | ipv6_addr_copy(&sin6->sin6_addr, &np->daddr); | |
1947 | sin6->sin6_port = inet_sk(sk)->dport; | |
1948 | /* We do not store received flowlabel for TCP */ | |
1949 | sin6->sin6_flowinfo = 0; | |
1950 | sin6->sin6_scope_id = 0; | |
1951 | if (sk->sk_bound_dev_if && | |
1952 | ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
1953 | sin6->sin6_scope_id = sk->sk_bound_dev_if; | |
1954 | } | |
1955 | ||
1956 | static int tcp_v6_remember_stamp(struct sock *sk) | |
1957 | { | |
1958 | /* Alas, not yet... */ | |
1959 | return 0; | |
1960 | } | |
1961 | ||
1962 | static struct tcp_func ipv6_specific = { | |
1963 | .queue_xmit = tcp_v6_xmit, | |
1964 | .send_check = tcp_v6_send_check, | |
1965 | .rebuild_header = tcp_v6_rebuild_header, | |
1966 | .conn_request = tcp_v6_conn_request, | |
1967 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1968 | .remember_stamp = tcp_v6_remember_stamp, | |
1969 | .net_header_len = sizeof(struct ipv6hdr), | |
1970 | ||
1971 | .setsockopt = ipv6_setsockopt, | |
1972 | .getsockopt = ipv6_getsockopt, | |
1973 | .addr2sockaddr = v6_addr2sockaddr, | |
1974 | .sockaddr_len = sizeof(struct sockaddr_in6) | |
1975 | }; | |
1976 | ||
1977 | /* | |
1978 | * TCP over IPv4 via INET6 API | |
1979 | */ | |
1980 | ||
1981 | static struct tcp_func ipv6_mapped = { | |
1982 | .queue_xmit = ip_queue_xmit, | |
1983 | .send_check = tcp_v4_send_check, | |
1984 | .rebuild_header = tcp_v4_rebuild_header, | |
1985 | .conn_request = tcp_v6_conn_request, | |
1986 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1987 | .remember_stamp = tcp_v4_remember_stamp, | |
1988 | .net_header_len = sizeof(struct iphdr), | |
1989 | ||
1990 | .setsockopt = ipv6_setsockopt, | |
1991 | .getsockopt = ipv6_getsockopt, | |
1992 | .addr2sockaddr = v6_addr2sockaddr, | |
1993 | .sockaddr_len = sizeof(struct sockaddr_in6) | |
1994 | }; | |
1995 | ||
1996 | ||
1997 | ||
1998 | /* NOTE: A lot of things set to zero explicitly by call to | |
1999 | * sk_alloc() so need not be done here. | |
2000 | */ | |
2001 | static int tcp_v6_init_sock(struct sock *sk) | |
2002 | { | |
2003 | struct tcp_sock *tp = tcp_sk(sk); | |
2004 | ||
2005 | skb_queue_head_init(&tp->out_of_order_queue); | |
2006 | tcp_init_xmit_timers(sk); | |
2007 | tcp_prequeue_init(tp); | |
2008 | ||
2009 | tp->rto = TCP_TIMEOUT_INIT; | |
2010 | tp->mdev = TCP_TIMEOUT_INIT; | |
2011 | ||
2012 | /* So many TCP implementations out there (incorrectly) count the | |
2013 | * initial SYN frame in their delayed-ACK and congestion control | |
2014 | * algorithms that we must have the following bandaid to talk | |
2015 | * efficiently to them. -DaveM | |
2016 | */ | |
2017 | tp->snd_cwnd = 2; | |
2018 | ||
2019 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
2020 | * initialization of these values. | |
2021 | */ | |
2022 | tp->snd_ssthresh = 0x7fffffff; | |
2023 | tp->snd_cwnd_clamp = ~0; | |
2024 | tp->mss_cache_std = tp->mss_cache = 536; | |
2025 | ||
2026 | tp->reordering = sysctl_tcp_reordering; | |
2027 | ||
2028 | sk->sk_state = TCP_CLOSE; | |
2029 | ||
2030 | tp->af_specific = &ipv6_specific; | |
2031 | ||
2032 | sk->sk_write_space = sk_stream_write_space; | |
2033 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
2034 | ||
2035 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; | |
2036 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
2037 | ||
2038 | atomic_inc(&tcp_sockets_allocated); | |
2039 | ||
2040 | return 0; | |
2041 | } | |
2042 | ||
2043 | static int tcp_v6_destroy_sock(struct sock *sk) | |
2044 | { | |
2045 | extern int tcp_v4_destroy_sock(struct sock *sk); | |
2046 | ||
2047 | tcp_v4_destroy_sock(sk); | |
2048 | return inet6_destroy_sock(sk); | |
2049 | } | |
2050 | ||
2051 | /* Proc filesystem TCPv6 sock list dumping. */ | |
2052 | static void get_openreq6(struct seq_file *seq, | |
2053 | struct sock *sk, struct open_request *req, int i, int uid) | |
2054 | { | |
2055 | struct in6_addr *dest, *src; | |
2056 | int ttd = req->expires - jiffies; | |
2057 | ||
2058 | if (ttd < 0) | |
2059 | ttd = 0; | |
2060 | ||
2061 | src = &req->af.v6_req.loc_addr; | |
2062 | dest = &req->af.v6_req.rmt_addr; | |
2063 | seq_printf(seq, | |
2064 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2065 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
2066 | i, | |
2067 | src->s6_addr32[0], src->s6_addr32[1], | |
2068 | src->s6_addr32[2], src->s6_addr32[3], | |
2069 | ntohs(inet_sk(sk)->sport), | |
2070 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2071 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2072 | ntohs(req->rmt_port), | |
2073 | TCP_SYN_RECV, | |
2074 | 0,0, /* could print option size, but that is af dependent. */ | |
2075 | 1, /* timers active (only the expire timer) */ | |
2076 | jiffies_to_clock_t(ttd), | |
2077 | req->retrans, | |
2078 | uid, | |
2079 | 0, /* non standard timer */ | |
2080 | 0, /* open_requests have no inode */ | |
2081 | 0, req); | |
2082 | } | |
2083 | ||
2084 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
2085 | { | |
2086 | struct in6_addr *dest, *src; | |
2087 | __u16 destp, srcp; | |
2088 | int timer_active; | |
2089 | unsigned long timer_expires; | |
2090 | struct inet_sock *inet = inet_sk(sp); | |
2091 | struct tcp_sock *tp = tcp_sk(sp); | |
2092 | struct ipv6_pinfo *np = inet6_sk(sp); | |
2093 | ||
2094 | dest = &np->daddr; | |
2095 | src = &np->rcv_saddr; | |
2096 | destp = ntohs(inet->dport); | |
2097 | srcp = ntohs(inet->sport); | |
2098 | if (tp->pending == TCP_TIME_RETRANS) { | |
2099 | timer_active = 1; | |
2100 | timer_expires = tp->timeout; | |
2101 | } else if (tp->pending == TCP_TIME_PROBE0) { | |
2102 | timer_active = 4; | |
2103 | timer_expires = tp->timeout; | |
2104 | } else if (timer_pending(&sp->sk_timer)) { | |
2105 | timer_active = 2; | |
2106 | timer_expires = sp->sk_timer.expires; | |
2107 | } else { | |
2108 | timer_active = 0; | |
2109 | timer_expires = jiffies; | |
2110 | } | |
2111 | ||
2112 | seq_printf(seq, | |
2113 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2114 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n", | |
2115 | i, | |
2116 | src->s6_addr32[0], src->s6_addr32[1], | |
2117 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2118 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2119 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2120 | sp->sk_state, | |
2121 | tp->write_seq-tp->snd_una, tp->rcv_nxt-tp->copied_seq, | |
2122 | timer_active, | |
2123 | jiffies_to_clock_t(timer_expires - jiffies), | |
2124 | tp->retransmits, | |
2125 | sock_i_uid(sp), | |
2126 | tp->probes_out, | |
2127 | sock_i_ino(sp), | |
2128 | atomic_read(&sp->sk_refcnt), sp, | |
2129 | tp->rto, tp->ack.ato, (tp->ack.quick<<1)|tp->ack.pingpong, | |
2130 | tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh | |
2131 | ); | |
2132 | } | |
2133 | ||
2134 | static void get_timewait6_sock(struct seq_file *seq, | |
2135 | struct tcp_tw_bucket *tw, int i) | |
2136 | { | |
2137 | struct in6_addr *dest, *src; | |
2138 | __u16 destp, srcp; | |
2139 | int ttd = tw->tw_ttd - jiffies; | |
2140 | ||
2141 | if (ttd < 0) | |
2142 | ttd = 0; | |
2143 | ||
2144 | dest = &tw->tw_v6_daddr; | |
2145 | src = &tw->tw_v6_rcv_saddr; | |
2146 | destp = ntohs(tw->tw_dport); | |
2147 | srcp = ntohs(tw->tw_sport); | |
2148 | ||
2149 | seq_printf(seq, | |
2150 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2151 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
2152 | i, | |
2153 | src->s6_addr32[0], src->s6_addr32[1], | |
2154 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2155 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2156 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2157 | tw->tw_substate, 0, 0, | |
2158 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2159 | atomic_read(&tw->tw_refcnt), tw); | |
2160 | } | |
2161 | ||
2162 | #ifdef CONFIG_PROC_FS | |
2163 | static int tcp6_seq_show(struct seq_file *seq, void *v) | |
2164 | { | |
2165 | struct tcp_iter_state *st; | |
2166 | ||
2167 | if (v == SEQ_START_TOKEN) { | |
2168 | seq_puts(seq, | |
2169 | " sl " | |
2170 | "local_address " | |
2171 | "remote_address " | |
2172 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2173 | " uid timeout inode\n"); | |
2174 | goto out; | |
2175 | } | |
2176 | st = seq->private; | |
2177 | ||
2178 | switch (st->state) { | |
2179 | case TCP_SEQ_STATE_LISTENING: | |
2180 | case TCP_SEQ_STATE_ESTABLISHED: | |
2181 | get_tcp6_sock(seq, v, st->num); | |
2182 | break; | |
2183 | case TCP_SEQ_STATE_OPENREQ: | |
2184 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
2185 | break; | |
2186 | case TCP_SEQ_STATE_TIME_WAIT: | |
2187 | get_timewait6_sock(seq, v, st->num); | |
2188 | break; | |
2189 | } | |
2190 | out: | |
2191 | return 0; | |
2192 | } | |
2193 | ||
2194 | static struct file_operations tcp6_seq_fops; | |
2195 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { | |
2196 | .owner = THIS_MODULE, | |
2197 | .name = "tcp6", | |
2198 | .family = AF_INET6, | |
2199 | .seq_show = tcp6_seq_show, | |
2200 | .seq_fops = &tcp6_seq_fops, | |
2201 | }; | |
2202 | ||
2203 | int __init tcp6_proc_init(void) | |
2204 | { | |
2205 | return tcp_proc_register(&tcp6_seq_afinfo); | |
2206 | } | |
2207 | ||
2208 | void tcp6_proc_exit(void) | |
2209 | { | |
2210 | tcp_proc_unregister(&tcp6_seq_afinfo); | |
2211 | } | |
2212 | #endif | |
2213 | ||
2214 | struct proto tcpv6_prot = { | |
2215 | .name = "TCPv6", | |
2216 | .owner = THIS_MODULE, | |
2217 | .close = tcp_close, | |
2218 | .connect = tcp_v6_connect, | |
2219 | .disconnect = tcp_disconnect, | |
2220 | .accept = tcp_accept, | |
2221 | .ioctl = tcp_ioctl, | |
2222 | .init = tcp_v6_init_sock, | |
2223 | .destroy = tcp_v6_destroy_sock, | |
2224 | .shutdown = tcp_shutdown, | |
2225 | .setsockopt = tcp_setsockopt, | |
2226 | .getsockopt = tcp_getsockopt, | |
2227 | .sendmsg = tcp_sendmsg, | |
2228 | .recvmsg = tcp_recvmsg, | |
2229 | .backlog_rcv = tcp_v6_do_rcv, | |
2230 | .hash = tcp_v6_hash, | |
2231 | .unhash = tcp_unhash, | |
2232 | .get_port = tcp_v6_get_port, | |
2233 | .enter_memory_pressure = tcp_enter_memory_pressure, | |
2234 | .sockets_allocated = &tcp_sockets_allocated, | |
2235 | .memory_allocated = &tcp_memory_allocated, | |
2236 | .memory_pressure = &tcp_memory_pressure, | |
2237 | .sysctl_mem = sysctl_tcp_mem, | |
2238 | .sysctl_wmem = sysctl_tcp_wmem, | |
2239 | .sysctl_rmem = sysctl_tcp_rmem, | |
2240 | .max_header = MAX_TCP_HEADER, | |
2241 | .obj_size = sizeof(struct tcp6_sock), | |
2242 | }; | |
2243 | ||
2244 | static struct inet6_protocol tcpv6_protocol = { | |
2245 | .handler = tcp_v6_rcv, | |
2246 | .err_handler = tcp_v6_err, | |
2247 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
2248 | }; | |
2249 | ||
2250 | extern struct proto_ops inet6_stream_ops; | |
2251 | ||
2252 | static struct inet_protosw tcpv6_protosw = { | |
2253 | .type = SOCK_STREAM, | |
2254 | .protocol = IPPROTO_TCP, | |
2255 | .prot = &tcpv6_prot, | |
2256 | .ops = &inet6_stream_ops, | |
2257 | .capability = -1, | |
2258 | .no_check = 0, | |
2259 | .flags = INET_PROTOSW_PERMANENT, | |
2260 | }; | |
2261 | ||
2262 | void __init tcpv6_init(void) | |
2263 | { | |
2264 | /* register inet6 protocol */ | |
2265 | if (inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP) < 0) | |
2266 | printk(KERN_ERR "tcpv6_init: Could not register protocol\n"); | |
2267 | inet6_register_protosw(&tcpv6_protosw); | |
2268 | } |