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Commit | Line | Data |
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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); | |
60236fdd | 68 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req); |
1da177e4 LT |
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; | |
6e04e021 | 87 | return (hashent & (tcp_hashinfo.ehash_size - 1)); |
1da177e4 LT |
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 | ||
0f7ff927 ACM |
101 | static inline int tcp_v6_bind_conflict(const struct sock *sk, |
102 | const struct inet_bind_bucket *tb) | |
1da177e4 | 103 | { |
0f7ff927 ACM |
104 | const struct sock *sk2; |
105 | const struct hlist_node *node; | |
1da177e4 LT |
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 | { | |
0f7ff927 ACM |
129 | struct inet_bind_hashbucket *head; |
130 | struct inet_bind_bucket *tb; | |
1da177e4 LT |
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 | ||
6e04e021 ACM |
141 | spin_lock(&tcp_hashinfo.portalloc_lock); |
142 | if (tcp_hashinfo.port_rover < low) | |
c3924c70 FH |
143 | rover = low; |
144 | else | |
6e04e021 | 145 | rover = tcp_hashinfo.port_rover; |
1da177e4 | 146 | do { rover++; |
c3924c70 | 147 | if (rover > high) |
1da177e4 | 148 | rover = low; |
6e04e021 | 149 | head = &tcp_hashinfo.bhash[inet_bhashfn(rover, tcp_hashinfo.bhash_size)]; |
1da177e4 | 150 | spin_lock(&head->lock); |
0f7ff927 | 151 | inet_bind_bucket_for_each(tb, node, &head->chain) |
1da177e4 LT |
152 | if (tb->port == rover) |
153 | goto next; | |
154 | break; | |
155 | next: | |
156 | spin_unlock(&head->lock); | |
157 | } while (--remaining > 0); | |
6e04e021 ACM |
158 | tcp_hashinfo.port_rover = rover; |
159 | spin_unlock(&tcp_hashinfo.portalloc_lock); | |
1da177e4 | 160 | |
d5d28375 DM |
161 | /* Exhausted local port range during search? It is not |
162 | * possible for us to be holding one of the bind hash | |
163 | * locks if this test triggers, because if 'remaining' | |
164 | * drops to zero, we broke out of the do/while loop at | |
165 | * the top level, not from the 'break;' statement. | |
166 | */ | |
1da177e4 | 167 | ret = 1; |
d5d28375 | 168 | if (unlikely(remaining <= 0)) |
1da177e4 LT |
169 | goto fail; |
170 | ||
171 | /* OK, here is the one we will use. */ | |
172 | snum = rover; | |
173 | } else { | |
6e04e021 | 174 | head = &tcp_hashinfo.bhash[inet_bhashfn(snum, tcp_hashinfo.bhash_size)]; |
1da177e4 | 175 | spin_lock(&head->lock); |
0f7ff927 | 176 | inet_bind_bucket_for_each(tb, node, &head->chain) |
1da177e4 LT |
177 | if (tb->port == snum) |
178 | goto tb_found; | |
179 | } | |
180 | tb = NULL; | |
181 | goto tb_not_found; | |
182 | tb_found: | |
183 | if (tb && !hlist_empty(&tb->owners)) { | |
184 | if (tb->fastreuse > 0 && sk->sk_reuse && | |
185 | sk->sk_state != TCP_LISTEN) { | |
186 | goto success; | |
187 | } else { | |
188 | ret = 1; | |
189 | if (tcp_v6_bind_conflict(sk, tb)) | |
190 | goto fail_unlock; | |
191 | } | |
192 | } | |
193 | tb_not_found: | |
194 | ret = 1; | |
6e04e021 ACM |
195 | if (tb == NULL) { |
196 | tb = inet_bind_bucket_create(tcp_hashinfo.bind_bucket_cachep, head, snum); | |
197 | if (tb == NULL) | |
198 | goto fail_unlock; | |
199 | } | |
1da177e4 LT |
200 | if (hlist_empty(&tb->owners)) { |
201 | if (sk->sk_reuse && sk->sk_state != TCP_LISTEN) | |
202 | tb->fastreuse = 1; | |
203 | else | |
204 | tb->fastreuse = 0; | |
205 | } else if (tb->fastreuse && | |
206 | (!sk->sk_reuse || sk->sk_state == TCP_LISTEN)) | |
207 | tb->fastreuse = 0; | |
208 | ||
209 | success: | |
463c84b9 | 210 | if (!inet_csk(sk)->icsk_bind_hash) |
2d8c4ce5 | 211 | inet_bind_hash(sk, tb, snum); |
463c84b9 | 212 | BUG_TRAP(inet_csk(sk)->icsk_bind_hash == tb); |
1da177e4 LT |
213 | ret = 0; |
214 | ||
215 | fail_unlock: | |
216 | spin_unlock(&head->lock); | |
217 | fail: | |
218 | local_bh_enable(); | |
219 | return ret; | |
220 | } | |
221 | ||
222 | static __inline__ void __tcp_v6_hash(struct sock *sk) | |
223 | { | |
224 | struct hlist_head *list; | |
225 | rwlock_t *lock; | |
226 | ||
227 | BUG_TRAP(sk_unhashed(sk)); | |
228 | ||
229 | if (sk->sk_state == TCP_LISTEN) { | |
6e04e021 ACM |
230 | list = &tcp_hashinfo.listening_hash[inet_sk_listen_hashfn(sk)]; |
231 | lock = &tcp_hashinfo.lhash_lock; | |
f3f05f70 | 232 | inet_listen_wlock(&tcp_hashinfo); |
1da177e4 LT |
233 | } else { |
234 | sk->sk_hashent = tcp_v6_sk_hashfn(sk); | |
6e04e021 ACM |
235 | list = &tcp_hashinfo.ehash[sk->sk_hashent].chain; |
236 | lock = &tcp_hashinfo.ehash[sk->sk_hashent].lock; | |
1da177e4 LT |
237 | write_lock(lock); |
238 | } | |
239 | ||
240 | __sk_add_node(sk, list); | |
241 | sock_prot_inc_use(sk->sk_prot); | |
242 | write_unlock(lock); | |
243 | } | |
244 | ||
245 | ||
246 | static void tcp_v6_hash(struct sock *sk) | |
247 | { | |
248 | if (sk->sk_state != TCP_CLOSE) { | |
249 | struct tcp_sock *tp = tcp_sk(sk); | |
250 | ||
251 | if (tp->af_specific == &ipv6_mapped) { | |
252 | tcp_prot.hash(sk); | |
253 | return; | |
254 | } | |
255 | local_bh_disable(); | |
256 | __tcp_v6_hash(sk); | |
257 | local_bh_enable(); | |
258 | } | |
259 | } | |
260 | ||
261 | static struct sock *tcp_v6_lookup_listener(struct in6_addr *daddr, unsigned short hnum, int dif) | |
262 | { | |
263 | struct sock *sk; | |
264 | struct hlist_node *node; | |
265 | struct sock *result = NULL; | |
266 | int score, hiscore; | |
267 | ||
268 | hiscore=0; | |
6e04e021 ACM |
269 | read_lock(&tcp_hashinfo.lhash_lock); |
270 | sk_for_each(sk, node, &tcp_hashinfo.listening_hash[inet_lhashfn(hnum)]) { | |
1da177e4 LT |
271 | if (inet_sk(sk)->num == hnum && sk->sk_family == PF_INET6) { |
272 | struct ipv6_pinfo *np = inet6_sk(sk); | |
273 | ||
274 | score = 1; | |
275 | if (!ipv6_addr_any(&np->rcv_saddr)) { | |
276 | if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) | |
277 | continue; | |
278 | score++; | |
279 | } | |
280 | if (sk->sk_bound_dev_if) { | |
281 | if (sk->sk_bound_dev_if != dif) | |
282 | continue; | |
283 | score++; | |
284 | } | |
285 | if (score == 3) { | |
286 | result = sk; | |
287 | break; | |
288 | } | |
289 | if (score > hiscore) { | |
290 | hiscore = score; | |
291 | result = sk; | |
292 | } | |
293 | } | |
294 | } | |
295 | if (result) | |
296 | sock_hold(result); | |
6e04e021 | 297 | read_unlock(&tcp_hashinfo.lhash_lock); |
1da177e4 LT |
298 | return result; |
299 | } | |
300 | ||
301 | /* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so | |
302 | * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM | |
303 | * | |
304 | * The sockhash lock must be held as a reader here. | |
305 | */ | |
306 | ||
307 | static inline struct sock *__tcp_v6_lookup_established(struct in6_addr *saddr, u16 sport, | |
308 | struct in6_addr *daddr, u16 hnum, | |
309 | int dif) | |
310 | { | |
1da177e4 | 311 | struct sock *sk; |
8feaf0c0 ACM |
312 | const struct hlist_node *node; |
313 | const __u32 ports = INET_COMBINED_PORTS(sport, hnum); | |
1da177e4 LT |
314 | /* Optimize here for direct hit, only listening connections can |
315 | * have wildcards anyways. | |
316 | */ | |
8feaf0c0 ACM |
317 | const int hash = tcp_v6_hashfn(daddr, hnum, saddr, sport); |
318 | struct inet_ehash_bucket *head = &tcp_hashinfo.ehash[hash]; | |
319 | ||
1da177e4 LT |
320 | read_lock(&head->lock); |
321 | sk_for_each(sk, node, &head->chain) { | |
322 | /* For IPV6 do the cheaper port and family tests first. */ | |
8feaf0c0 | 323 | if (INET6_MATCH(sk, saddr, daddr, ports, dif)) |
1da177e4 LT |
324 | goto hit; /* You sunk my battleship! */ |
325 | } | |
326 | /* Must check for a TIME_WAIT'er before going to listener hash. */ | |
6e04e021 | 327 | sk_for_each(sk, node, &(head + tcp_hashinfo.ehash_size)->chain) { |
8feaf0c0 | 328 | const struct inet_timewait_sock *tw = inet_twsk(sk); |
1da177e4 LT |
329 | |
330 | if(*((__u32 *)&(tw->tw_dport)) == ports && | |
331 | sk->sk_family == PF_INET6) { | |
8feaf0c0 ACM |
332 | const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk); |
333 | ||
334 | if (ipv6_addr_equal(&tcp6tw->tw_v6_daddr, saddr) && | |
335 | ipv6_addr_equal(&tcp6tw->tw_v6_rcv_saddr, daddr) && | |
336 | (!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dif)) | |
1da177e4 LT |
337 | goto hit; |
338 | } | |
339 | } | |
340 | read_unlock(&head->lock); | |
341 | return NULL; | |
342 | ||
343 | hit: | |
344 | sock_hold(sk); | |
345 | read_unlock(&head->lock); | |
346 | return sk; | |
347 | } | |
348 | ||
349 | ||
350 | static inline struct sock *__tcp_v6_lookup(struct in6_addr *saddr, u16 sport, | |
351 | struct in6_addr *daddr, u16 hnum, | |
352 | int dif) | |
353 | { | |
354 | struct sock *sk; | |
355 | ||
356 | sk = __tcp_v6_lookup_established(saddr, sport, daddr, hnum, dif); | |
357 | ||
358 | if (sk) | |
359 | return sk; | |
360 | ||
361 | return tcp_v6_lookup_listener(daddr, hnum, dif); | |
362 | } | |
363 | ||
364 | inline struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport, | |
365 | struct in6_addr *daddr, u16 dport, | |
366 | int dif) | |
367 | { | |
368 | struct sock *sk; | |
369 | ||
370 | local_bh_disable(); | |
371 | sk = __tcp_v6_lookup(saddr, sport, daddr, ntohs(dport), dif); | |
372 | local_bh_enable(); | |
373 | ||
374 | return sk; | |
375 | } | |
376 | ||
377 | EXPORT_SYMBOL_GPL(tcp_v6_lookup); | |
378 | ||
379 | ||
380 | /* | |
381 | * Open request hash tables. | |
382 | */ | |
383 | ||
463c84b9 | 384 | static u32 tcp_v6_synq_hash(const struct in6_addr *raddr, const u16 rport, const u32 rnd) |
1da177e4 LT |
385 | { |
386 | u32 a, b, c; | |
387 | ||
388 | a = raddr->s6_addr32[0]; | |
389 | b = raddr->s6_addr32[1]; | |
390 | c = raddr->s6_addr32[2]; | |
391 | ||
392 | a += JHASH_GOLDEN_RATIO; | |
393 | b += JHASH_GOLDEN_RATIO; | |
394 | c += rnd; | |
395 | __jhash_mix(a, b, c); | |
396 | ||
397 | a += raddr->s6_addr32[3]; | |
398 | b += (u32) rport; | |
399 | __jhash_mix(a, b, c); | |
400 | ||
401 | return c & (TCP_SYNQ_HSIZE - 1); | |
402 | } | |
403 | ||
463c84b9 | 404 | static struct request_sock *tcp_v6_search_req(const struct sock *sk, |
60236fdd | 405 | struct request_sock ***prevp, |
1da177e4 LT |
406 | __u16 rport, |
407 | struct in6_addr *raddr, | |
408 | struct in6_addr *laddr, | |
409 | int iif) | |
410 | { | |
463c84b9 ACM |
411 | const struct inet_connection_sock *icsk = inet_csk(sk); |
412 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
60236fdd | 413 | struct request_sock *req, **prev; |
1da177e4 LT |
414 | |
415 | for (prev = &lopt->syn_table[tcp_v6_synq_hash(raddr, rport, lopt->hash_rnd)]; | |
416 | (req = *prev) != NULL; | |
417 | prev = &req->dl_next) { | |
2e6599cb ACM |
418 | const struct tcp6_request_sock *treq = tcp6_rsk(req); |
419 | ||
420 | if (inet_rsk(req)->rmt_port == rport && | |
60236fdd | 421 | req->rsk_ops->family == AF_INET6 && |
2e6599cb ACM |
422 | ipv6_addr_equal(&treq->rmt_addr, raddr) && |
423 | ipv6_addr_equal(&treq->loc_addr, laddr) && | |
424 | (!treq->iif || treq->iif == iif)) { | |
1da177e4 LT |
425 | BUG_TRAP(req->sk == NULL); |
426 | *prevp = prev; | |
427 | return req; | |
428 | } | |
429 | } | |
430 | ||
431 | return NULL; | |
432 | } | |
433 | ||
434 | static __inline__ u16 tcp_v6_check(struct tcphdr *th, int len, | |
435 | struct in6_addr *saddr, | |
436 | struct in6_addr *daddr, | |
437 | unsigned long base) | |
438 | { | |
439 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
440 | } | |
441 | ||
442 | static __u32 tcp_v6_init_sequence(struct sock *sk, struct sk_buff *skb) | |
443 | { | |
444 | if (skb->protocol == htons(ETH_P_IPV6)) { | |
445 | return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32, | |
446 | skb->nh.ipv6h->saddr.s6_addr32, | |
447 | skb->h.th->dest, | |
448 | skb->h.th->source); | |
449 | } else { | |
450 | return secure_tcp_sequence_number(skb->nh.iph->daddr, | |
451 | skb->nh.iph->saddr, | |
452 | skb->h.th->dest, | |
453 | skb->h.th->source); | |
454 | } | |
455 | } | |
456 | ||
457 | static int __tcp_v6_check_established(struct sock *sk, __u16 lport, | |
8feaf0c0 | 458 | struct inet_timewait_sock **twp) |
1da177e4 LT |
459 | { |
460 | struct inet_sock *inet = inet_sk(sk); | |
461 | struct ipv6_pinfo *np = inet6_sk(sk); | |
462 | struct in6_addr *daddr = &np->rcv_saddr; | |
463 | struct in6_addr *saddr = &np->daddr; | |
464 | int dif = sk->sk_bound_dev_if; | |
8feaf0c0 ACM |
465 | const u32 ports = INET_COMBINED_PORTS(inet->dport, lport); |
466 | const int hash = tcp_v6_hashfn(daddr, inet->num, saddr, inet->dport); | |
6e04e021 | 467 | struct inet_ehash_bucket *head = &tcp_hashinfo.ehash[hash]; |
1da177e4 | 468 | struct sock *sk2; |
8feaf0c0 ACM |
469 | const struct hlist_node *node; |
470 | struct inet_timewait_sock *tw; | |
1da177e4 LT |
471 | |
472 | write_lock(&head->lock); | |
473 | ||
474 | /* Check TIME-WAIT sockets first. */ | |
6e04e021 | 475 | sk_for_each(sk2, node, &(head + tcp_hashinfo.ehash_size)->chain) { |
8feaf0c0 ACM |
476 | const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk2); |
477 | ||
478 | tw = inet_twsk(sk2); | |
1da177e4 LT |
479 | |
480 | if(*((__u32 *)&(tw->tw_dport)) == ports && | |
481 | sk2->sk_family == PF_INET6 && | |
8feaf0c0 ACM |
482 | ipv6_addr_equal(&tcp6tw->tw_v6_daddr, saddr) && |
483 | ipv6_addr_equal(&tcp6tw->tw_v6_rcv_saddr, daddr) && | |
1da177e4 | 484 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) { |
8feaf0c0 | 485 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sk2); |
1da177e4 LT |
486 | struct tcp_sock *tp = tcp_sk(sk); |
487 | ||
8feaf0c0 ACM |
488 | if (tcptw->tw_ts_recent_stamp && |
489 | (!twp || | |
490 | (sysctl_tcp_tw_reuse && | |
491 | xtime.tv_sec - tcptw->tw_ts_recent_stamp > 1))) { | |
1da177e4 | 492 | /* See comment in tcp_ipv4.c */ |
8feaf0c0 | 493 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; |
1da177e4 LT |
494 | if (!tp->write_seq) |
495 | tp->write_seq = 1; | |
8feaf0c0 ACM |
496 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; |
497 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; | |
1da177e4 LT |
498 | sock_hold(sk2); |
499 | goto unique; | |
500 | } else | |
501 | goto not_unique; | |
502 | } | |
503 | } | |
504 | tw = NULL; | |
505 | ||
506 | /* And established part... */ | |
507 | sk_for_each(sk2, node, &head->chain) { | |
8feaf0c0 | 508 | if (INET6_MATCH(sk2, saddr, daddr, ports, dif)) |
1da177e4 LT |
509 | goto not_unique; |
510 | } | |
511 | ||
512 | unique: | |
513 | BUG_TRAP(sk_unhashed(sk)); | |
514 | __sk_add_node(sk, &head->chain); | |
515 | sk->sk_hashent = hash; | |
516 | sock_prot_inc_use(sk->sk_prot); | |
517 | write_unlock(&head->lock); | |
518 | ||
519 | if (twp) { | |
520 | *twp = tw; | |
521 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); | |
522 | } else if (tw) { | |
523 | /* Silly. Should hash-dance instead... */ | |
524 | tcp_tw_deschedule(tw); | |
525 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); | |
526 | ||
8feaf0c0 | 527 | inet_twsk_put(tw); |
1da177e4 LT |
528 | } |
529 | return 0; | |
530 | ||
531 | not_unique: | |
532 | write_unlock(&head->lock); | |
533 | return -EADDRNOTAVAIL; | |
534 | } | |
535 | ||
536 | static inline u32 tcpv6_port_offset(const struct sock *sk) | |
537 | { | |
538 | const struct inet_sock *inet = inet_sk(sk); | |
539 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
540 | ||
541 | return secure_tcpv6_port_ephemeral(np->rcv_saddr.s6_addr32, | |
542 | np->daddr.s6_addr32, | |
543 | inet->dport); | |
544 | } | |
545 | ||
546 | static int tcp_v6_hash_connect(struct sock *sk) | |
547 | { | |
548 | unsigned short snum = inet_sk(sk)->num; | |
0f7ff927 ACM |
549 | struct inet_bind_hashbucket *head; |
550 | struct inet_bind_bucket *tb; | |
1da177e4 LT |
551 | int ret; |
552 | ||
553 | if (!snum) { | |
554 | int low = sysctl_local_port_range[0]; | |
555 | int high = sysctl_local_port_range[1]; | |
556 | int range = high - low; | |
557 | int i; | |
558 | int port; | |
559 | static u32 hint; | |
560 | u32 offset = hint + tcpv6_port_offset(sk); | |
561 | struct hlist_node *node; | |
8feaf0c0 | 562 | struct inet_timewait_sock *tw = NULL; |
1da177e4 LT |
563 | |
564 | local_bh_disable(); | |
565 | for (i = 1; i <= range; i++) { | |
566 | port = low + (i + offset) % range; | |
6e04e021 | 567 | head = &tcp_hashinfo.bhash[inet_bhashfn(port, tcp_hashinfo.bhash_size)]; |
1da177e4 LT |
568 | spin_lock(&head->lock); |
569 | ||
570 | /* Does not bother with rcv_saddr checks, | |
571 | * because the established check is already | |
572 | * unique enough. | |
573 | */ | |
0f7ff927 | 574 | inet_bind_bucket_for_each(tb, node, &head->chain) { |
1da177e4 LT |
575 | if (tb->port == port) { |
576 | BUG_TRAP(!hlist_empty(&tb->owners)); | |
577 | if (tb->fastreuse >= 0) | |
578 | goto next_port; | |
579 | if (!__tcp_v6_check_established(sk, | |
580 | port, | |
581 | &tw)) | |
582 | goto ok; | |
583 | goto next_port; | |
584 | } | |
585 | } | |
586 | ||
6e04e021 | 587 | tb = inet_bind_bucket_create(tcp_hashinfo.bind_bucket_cachep, head, port); |
1da177e4 LT |
588 | if (!tb) { |
589 | spin_unlock(&head->lock); | |
590 | break; | |
591 | } | |
592 | tb->fastreuse = -1; | |
593 | goto ok; | |
594 | ||
595 | next_port: | |
596 | spin_unlock(&head->lock); | |
597 | } | |
598 | local_bh_enable(); | |
599 | ||
600 | return -EADDRNOTAVAIL; | |
601 | ||
602 | ok: | |
603 | hint += i; | |
604 | ||
605 | /* Head lock still held and bh's disabled */ | |
2d8c4ce5 | 606 | inet_bind_hash(sk, tb, port); |
1da177e4 LT |
607 | if (sk_unhashed(sk)) { |
608 | inet_sk(sk)->sport = htons(port); | |
609 | __tcp_v6_hash(sk); | |
610 | } | |
611 | spin_unlock(&head->lock); | |
612 | ||
613 | if (tw) { | |
614 | tcp_tw_deschedule(tw); | |
8feaf0c0 | 615 | inet_twsk_put(tw); |
1da177e4 LT |
616 | } |
617 | ||
618 | ret = 0; | |
619 | goto out; | |
620 | } | |
621 | ||
6e04e021 | 622 | head = &tcp_hashinfo.bhash[inet_bhashfn(snum, tcp_hashinfo.bhash_size)]; |
463c84b9 | 623 | tb = inet_csk(sk)->icsk_bind_hash; |
1da177e4 LT |
624 | spin_lock_bh(&head->lock); |
625 | ||
626 | if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) { | |
627 | __tcp_v6_hash(sk); | |
628 | spin_unlock_bh(&head->lock); | |
629 | return 0; | |
630 | } else { | |
631 | spin_unlock(&head->lock); | |
632 | /* No definite answer... Walk to established hash table */ | |
633 | ret = __tcp_v6_check_established(sk, snum, NULL); | |
634 | out: | |
635 | local_bh_enable(); | |
636 | return ret; | |
637 | } | |
638 | } | |
639 | ||
640 | static __inline__ int tcp_v6_iif(struct sk_buff *skb) | |
641 | { | |
642 | return IP6CB(skb)->iif; | |
643 | } | |
644 | ||
645 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, | |
646 | int addr_len) | |
647 | { | |
648 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
649 | struct inet_sock *inet = inet_sk(sk); | |
650 | struct ipv6_pinfo *np = inet6_sk(sk); | |
651 | struct tcp_sock *tp = tcp_sk(sk); | |
652 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
653 | struct flowi fl; | |
654 | struct dst_entry *dst; | |
655 | int addr_type; | |
656 | int err; | |
657 | ||
658 | if (addr_len < SIN6_LEN_RFC2133) | |
659 | return -EINVAL; | |
660 | ||
661 | if (usin->sin6_family != AF_INET6) | |
662 | return(-EAFNOSUPPORT); | |
663 | ||
664 | memset(&fl, 0, sizeof(fl)); | |
665 | ||
666 | if (np->sndflow) { | |
667 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
668 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
669 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
670 | struct ip6_flowlabel *flowlabel; | |
671 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
672 | if (flowlabel == NULL) | |
673 | return -EINVAL; | |
674 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
675 | fl6_sock_release(flowlabel); | |
676 | } | |
677 | } | |
678 | ||
679 | /* | |
680 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
681 | */ | |
682 | ||
683 | if(ipv6_addr_any(&usin->sin6_addr)) | |
684 | usin->sin6_addr.s6_addr[15] = 0x1; | |
685 | ||
686 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
687 | ||
688 | if(addr_type & IPV6_ADDR_MULTICAST) | |
689 | return -ENETUNREACH; | |
690 | ||
691 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
692 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
693 | usin->sin6_scope_id) { | |
694 | /* If interface is set while binding, indices | |
695 | * must coincide. | |
696 | */ | |
697 | if (sk->sk_bound_dev_if && | |
698 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
699 | return -EINVAL; | |
700 | ||
701 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
702 | } | |
703 | ||
704 | /* Connect to link-local address requires an interface */ | |
705 | if (!sk->sk_bound_dev_if) | |
706 | return -EINVAL; | |
707 | } | |
708 | ||
709 | if (tp->rx_opt.ts_recent_stamp && | |
710 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
711 | tp->rx_opt.ts_recent = 0; | |
712 | tp->rx_opt.ts_recent_stamp = 0; | |
713 | tp->write_seq = 0; | |
714 | } | |
715 | ||
716 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
717 | np->flow_label = fl.fl6_flowlabel; | |
718 | ||
719 | /* | |
720 | * TCP over IPv4 | |
721 | */ | |
722 | ||
723 | if (addr_type == IPV6_ADDR_MAPPED) { | |
724 | u32 exthdrlen = tp->ext_header_len; | |
725 | struct sockaddr_in sin; | |
726 | ||
727 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
728 | ||
729 | if (__ipv6_only_sock(sk)) | |
730 | return -ENETUNREACH; | |
731 | ||
732 | sin.sin_family = AF_INET; | |
733 | sin.sin_port = usin->sin6_port; | |
734 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
735 | ||
736 | tp->af_specific = &ipv6_mapped; | |
737 | sk->sk_backlog_rcv = tcp_v4_do_rcv; | |
738 | ||
739 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
740 | ||
741 | if (err) { | |
742 | tp->ext_header_len = exthdrlen; | |
743 | tp->af_specific = &ipv6_specific; | |
744 | sk->sk_backlog_rcv = tcp_v6_do_rcv; | |
745 | goto failure; | |
746 | } else { | |
747 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
748 | inet->saddr); | |
749 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
750 | inet->rcv_saddr); | |
751 | } | |
752 | ||
753 | return err; | |
754 | } | |
755 | ||
756 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
757 | saddr = &np->rcv_saddr; | |
758 | ||
759 | fl.proto = IPPROTO_TCP; | |
760 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
761 | ipv6_addr_copy(&fl.fl6_src, | |
762 | (saddr ? saddr : &np->saddr)); | |
763 | fl.oif = sk->sk_bound_dev_if; | |
764 | fl.fl_ip_dport = usin->sin6_port; | |
765 | fl.fl_ip_sport = inet->sport; | |
766 | ||
767 | if (np->opt && np->opt->srcrt) { | |
768 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
769 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
770 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
771 | final_p = &final; | |
772 | } | |
773 | ||
774 | err = ip6_dst_lookup(sk, &dst, &fl); | |
775 | if (err) | |
776 | goto failure; | |
777 | if (final_p) | |
778 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
779 | ||
780 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
781 | dst_release(dst); | |
782 | goto failure; | |
783 | } | |
784 | ||
785 | if (saddr == NULL) { | |
786 | saddr = &fl.fl6_src; | |
787 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
788 | } | |
789 | ||
790 | /* set the source address */ | |
791 | ipv6_addr_copy(&np->saddr, saddr); | |
792 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
793 | ||
794 | ip6_dst_store(sk, dst, NULL); | |
795 | sk->sk_route_caps = dst->dev->features & | |
796 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
797 | ||
798 | tp->ext_header_len = 0; | |
799 | if (np->opt) | |
800 | tp->ext_header_len = np->opt->opt_flen + np->opt->opt_nflen; | |
801 | ||
802 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
803 | ||
804 | inet->dport = usin->sin6_port; | |
805 | ||
806 | tcp_set_state(sk, TCP_SYN_SENT); | |
807 | err = tcp_v6_hash_connect(sk); | |
808 | if (err) | |
809 | goto late_failure; | |
810 | ||
811 | if (!tp->write_seq) | |
812 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
813 | np->daddr.s6_addr32, | |
814 | inet->sport, | |
815 | inet->dport); | |
816 | ||
817 | err = tcp_connect(sk); | |
818 | if (err) | |
819 | goto late_failure; | |
820 | ||
821 | return 0; | |
822 | ||
823 | late_failure: | |
824 | tcp_set_state(sk, TCP_CLOSE); | |
825 | __sk_dst_reset(sk); | |
826 | failure: | |
827 | inet->dport = 0; | |
828 | sk->sk_route_caps = 0; | |
829 | return err; | |
830 | } | |
831 | ||
832 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
833 | int type, int code, int offset, __u32 info) | |
834 | { | |
835 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
836 | struct tcphdr *th = (struct tcphdr *)(skb->data+offset); | |
837 | struct ipv6_pinfo *np; | |
838 | struct sock *sk; | |
839 | int err; | |
840 | struct tcp_sock *tp; | |
841 | __u32 seq; | |
842 | ||
843 | sk = tcp_v6_lookup(&hdr->daddr, th->dest, &hdr->saddr, th->source, skb->dev->ifindex); | |
844 | ||
845 | if (sk == NULL) { | |
846 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
847 | return; | |
848 | } | |
849 | ||
850 | if (sk->sk_state == TCP_TIME_WAIT) { | |
8feaf0c0 | 851 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
852 | return; |
853 | } | |
854 | ||
855 | bh_lock_sock(sk); | |
856 | if (sock_owned_by_user(sk)) | |
857 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
858 | ||
859 | if (sk->sk_state == TCP_CLOSE) | |
860 | goto out; | |
861 | ||
862 | tp = tcp_sk(sk); | |
863 | seq = ntohl(th->seq); | |
864 | if (sk->sk_state != TCP_LISTEN && | |
865 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
866 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
867 | goto out; | |
868 | } | |
869 | ||
870 | np = inet6_sk(sk); | |
871 | ||
872 | if (type == ICMPV6_PKT_TOOBIG) { | |
873 | struct dst_entry *dst = NULL; | |
874 | ||
875 | if (sock_owned_by_user(sk)) | |
876 | goto out; | |
877 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
878 | goto out; | |
879 | ||
880 | /* icmp should have updated the destination cache entry */ | |
881 | dst = __sk_dst_check(sk, np->dst_cookie); | |
882 | ||
883 | if (dst == NULL) { | |
884 | struct inet_sock *inet = inet_sk(sk); | |
885 | struct flowi fl; | |
886 | ||
887 | /* BUGGG_FUTURE: Again, it is not clear how | |
888 | to handle rthdr case. Ignore this complexity | |
889 | for now. | |
890 | */ | |
891 | memset(&fl, 0, sizeof(fl)); | |
892 | fl.proto = IPPROTO_TCP; | |
893 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
894 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
895 | fl.oif = sk->sk_bound_dev_if; | |
896 | fl.fl_ip_dport = inet->dport; | |
897 | fl.fl_ip_sport = inet->sport; | |
898 | ||
899 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
900 | sk->sk_err_soft = -err; | |
901 | goto out; | |
902 | } | |
903 | ||
904 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
905 | sk->sk_err_soft = -err; | |
906 | goto out; | |
907 | } | |
908 | ||
909 | } else | |
910 | dst_hold(dst); | |
911 | ||
912 | if (tp->pmtu_cookie > dst_mtu(dst)) { | |
913 | tcp_sync_mss(sk, dst_mtu(dst)); | |
914 | tcp_simple_retransmit(sk); | |
915 | } /* else let the usual retransmit timer handle it */ | |
916 | dst_release(dst); | |
917 | goto out; | |
918 | } | |
919 | ||
920 | icmpv6_err_convert(type, code, &err); | |
921 | ||
60236fdd | 922 | /* Might be for an request_sock */ |
1da177e4 | 923 | switch (sk->sk_state) { |
60236fdd | 924 | struct request_sock *req, **prev; |
1da177e4 LT |
925 | case TCP_LISTEN: |
926 | if (sock_owned_by_user(sk)) | |
927 | goto out; | |
928 | ||
463c84b9 | 929 | req = tcp_v6_search_req(sk, &prev, th->dest, &hdr->daddr, |
1da177e4 LT |
930 | &hdr->saddr, tcp_v6_iif(skb)); |
931 | if (!req) | |
932 | goto out; | |
933 | ||
934 | /* ICMPs are not backlogged, hence we cannot get | |
935 | * an established socket here. | |
936 | */ | |
937 | BUG_TRAP(req->sk == NULL); | |
938 | ||
2e6599cb | 939 | if (seq != tcp_rsk(req)->snt_isn) { |
1da177e4 LT |
940 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
941 | goto out; | |
942 | } | |
943 | ||
463c84b9 | 944 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
945 | goto out; |
946 | ||
947 | case TCP_SYN_SENT: | |
948 | case TCP_SYN_RECV: /* Cannot happen. | |
949 | It can, it SYNs are crossed. --ANK */ | |
950 | if (!sock_owned_by_user(sk)) { | |
951 | TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS); | |
952 | sk->sk_err = err; | |
953 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
954 | ||
955 | tcp_done(sk); | |
956 | } else | |
957 | sk->sk_err_soft = err; | |
958 | goto out; | |
959 | } | |
960 | ||
961 | if (!sock_owned_by_user(sk) && np->recverr) { | |
962 | sk->sk_err = err; | |
963 | sk->sk_error_report(sk); | |
964 | } else | |
965 | sk->sk_err_soft = err; | |
966 | ||
967 | out: | |
968 | bh_unlock_sock(sk); | |
969 | sock_put(sk); | |
970 | } | |
971 | ||
972 | ||
60236fdd | 973 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, |
1da177e4 LT |
974 | struct dst_entry *dst) |
975 | { | |
2e6599cb | 976 | struct tcp6_request_sock *treq = tcp6_rsk(req); |
1da177e4 LT |
977 | struct ipv6_pinfo *np = inet6_sk(sk); |
978 | struct sk_buff * skb; | |
979 | struct ipv6_txoptions *opt = NULL; | |
980 | struct in6_addr * final_p = NULL, final; | |
981 | struct flowi fl; | |
982 | int err = -1; | |
983 | ||
984 | memset(&fl, 0, sizeof(fl)); | |
985 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
986 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
987 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 988 | fl.fl6_flowlabel = 0; |
2e6599cb ACM |
989 | fl.oif = treq->iif; |
990 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
1da177e4 LT |
991 | fl.fl_ip_sport = inet_sk(sk)->sport; |
992 | ||
993 | if (dst == NULL) { | |
994 | opt = np->opt; | |
995 | if (opt == NULL && | |
996 | np->rxopt.bits.srcrt == 2 && | |
2e6599cb ACM |
997 | treq->pktopts) { |
998 | struct sk_buff *pktopts = treq->pktopts; | |
1da177e4 LT |
999 | struct inet6_skb_parm *rxopt = IP6CB(pktopts); |
1000 | if (rxopt->srcrt) | |
1001 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr*)(pktopts->nh.raw + rxopt->srcrt)); | |
1002 | } | |
1003 | ||
1004 | if (opt && opt->srcrt) { | |
1005 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1006 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1007 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1008 | final_p = &final; | |
1009 | } | |
1010 | ||
1011 | err = ip6_dst_lookup(sk, &dst, &fl); | |
1012 | if (err) | |
1013 | goto done; | |
1014 | if (final_p) | |
1015 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1016 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
1017 | goto done; | |
1018 | } | |
1019 | ||
1020 | skb = tcp_make_synack(sk, dst, req); | |
1021 | if (skb) { | |
1022 | struct tcphdr *th = skb->h.th; | |
1023 | ||
1024 | th->check = tcp_v6_check(th, skb->len, | |
2e6599cb | 1025 | &treq->loc_addr, &treq->rmt_addr, |
1da177e4 LT |
1026 | csum_partial((char *)th, skb->len, skb->csum)); |
1027 | ||
2e6599cb | 1028 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
1029 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
1030 | if (err == NET_XMIT_CN) | |
1031 | err = 0; | |
1032 | } | |
1033 | ||
1034 | done: | |
1035 | dst_release(dst); | |
1036 | if (opt && opt != np->opt) | |
1037 | sock_kfree_s(sk, opt, opt->tot_len); | |
1038 | return err; | |
1039 | } | |
1040 | ||
60236fdd | 1041 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 1042 | { |
2e6599cb ACM |
1043 | if (tcp6_rsk(req)->pktopts) |
1044 | kfree_skb(tcp6_rsk(req)->pktopts); | |
1da177e4 LT |
1045 | } |
1046 | ||
60236fdd | 1047 | static struct request_sock_ops tcp6_request_sock_ops = { |
1da177e4 | 1048 | .family = AF_INET6, |
2e6599cb | 1049 | .obj_size = sizeof(struct tcp6_request_sock), |
1da177e4 | 1050 | .rtx_syn_ack = tcp_v6_send_synack, |
60236fdd ACM |
1051 | .send_ack = tcp_v6_reqsk_send_ack, |
1052 | .destructor = tcp_v6_reqsk_destructor, | |
1da177e4 LT |
1053 | .send_reset = tcp_v6_send_reset |
1054 | }; | |
1055 | ||
1056 | static int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) | |
1057 | { | |
1058 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1059 | struct inet6_skb_parm *opt = IP6CB(skb); | |
1060 | ||
1061 | if (np->rxopt.all) { | |
1062 | if ((opt->hop && np->rxopt.bits.hopopts) || | |
1063 | ((IPV6_FLOWINFO_MASK&*(u32*)skb->nh.raw) && | |
1064 | np->rxopt.bits.rxflow) || | |
1065 | (opt->srcrt && np->rxopt.bits.srcrt) || | |
1066 | ((opt->dst1 || opt->dst0) && np->rxopt.bits.dstopts)) | |
1067 | return 1; | |
1068 | } | |
1069 | return 0; | |
1070 | } | |
1071 | ||
1072 | ||
1073 | static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len, | |
1074 | struct sk_buff *skb) | |
1075 | { | |
1076 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1077 | ||
1078 | if (skb->ip_summed == CHECKSUM_HW) { | |
1079 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); | |
1080 | skb->csum = offsetof(struct tcphdr, check); | |
1081 | } else { | |
1082 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, | |
1083 | csum_partial((char *)th, th->doff<<2, | |
1084 | skb->csum)); | |
1085 | } | |
1086 | } | |
1087 | ||
1088 | ||
1089 | static void tcp_v6_send_reset(struct sk_buff *skb) | |
1090 | { | |
1091 | struct tcphdr *th = skb->h.th, *t1; | |
1092 | struct sk_buff *buff; | |
1093 | struct flowi fl; | |
1094 | ||
1095 | if (th->rst) | |
1096 | return; | |
1097 | ||
1098 | if (!ipv6_unicast_destination(skb)) | |
1099 | return; | |
1100 | ||
1101 | /* | |
1102 | * We need to grab some memory, and put together an RST, | |
1103 | * and then put it into the queue to be sent. | |
1104 | */ | |
1105 | ||
1106 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr), | |
1107 | GFP_ATOMIC); | |
1108 | if (buff == NULL) | |
1109 | return; | |
1110 | ||
1111 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr)); | |
1112 | ||
1113 | t1 = (struct tcphdr *) skb_push(buff,sizeof(struct tcphdr)); | |
1114 | ||
1115 | /* Swap the send and the receive. */ | |
1116 | memset(t1, 0, sizeof(*t1)); | |
1117 | t1->dest = th->source; | |
1118 | t1->source = th->dest; | |
1119 | t1->doff = sizeof(*t1)/4; | |
1120 | t1->rst = 1; | |
1121 | ||
1122 | if(th->ack) { | |
1123 | t1->seq = th->ack_seq; | |
1124 | } else { | |
1125 | t1->ack = 1; | |
1126 | t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin | |
1127 | + skb->len - (th->doff<<2)); | |
1128 | } | |
1129 | ||
1130 | buff->csum = csum_partial((char *)t1, sizeof(*t1), 0); | |
1131 | ||
1132 | memset(&fl, 0, sizeof(fl)); | |
1133 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); | |
1134 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); | |
1135 | ||
1136 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
1137 | sizeof(*t1), IPPROTO_TCP, | |
1138 | buff->csum); | |
1139 | ||
1140 | fl.proto = IPPROTO_TCP; | |
1141 | fl.oif = tcp_v6_iif(skb); | |
1142 | fl.fl_ip_dport = t1->dest; | |
1143 | fl.fl_ip_sport = t1->source; | |
1144 | ||
1145 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
1146 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
1147 | ||
1148 | if ((xfrm_lookup(&buff->dst, &fl, NULL, 0)) < 0) { | |
1149 | dst_release(buff->dst); | |
1150 | return; | |
1151 | } | |
1152 | ||
1153 | ip6_xmit(NULL, buff, &fl, NULL, 0); | |
1154 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
1155 | TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); | |
1156 | return; | |
1157 | } | |
1158 | ||
1159 | kfree_skb(buff); | |
1160 | } | |
1161 | ||
1162 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts) | |
1163 | { | |
1164 | struct tcphdr *th = skb->h.th, *t1; | |
1165 | struct sk_buff *buff; | |
1166 | struct flowi fl; | |
1167 | int tot_len = sizeof(struct tcphdr); | |
1168 | ||
1169 | if (ts) | |
1170 | tot_len += 3*4; | |
1171 | ||
1172 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, | |
1173 | GFP_ATOMIC); | |
1174 | if (buff == NULL) | |
1175 | return; | |
1176 | ||
1177 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); | |
1178 | ||
1179 | t1 = (struct tcphdr *) skb_push(buff,tot_len); | |
1180 | ||
1181 | /* Swap the send and the receive. */ | |
1182 | memset(t1, 0, sizeof(*t1)); | |
1183 | t1->dest = th->source; | |
1184 | t1->source = th->dest; | |
1185 | t1->doff = tot_len/4; | |
1186 | t1->seq = htonl(seq); | |
1187 | t1->ack_seq = htonl(ack); | |
1188 | t1->ack = 1; | |
1189 | t1->window = htons(win); | |
1190 | ||
1191 | if (ts) { | |
1192 | u32 *ptr = (u32*)(t1 + 1); | |
1193 | *ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
1194 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
1195 | *ptr++ = htonl(tcp_time_stamp); | |
1196 | *ptr = htonl(ts); | |
1197 | } | |
1198 | ||
1199 | buff->csum = csum_partial((char *)t1, tot_len, 0); | |
1200 | ||
1201 | memset(&fl, 0, sizeof(fl)); | |
1202 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); | |
1203 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); | |
1204 | ||
1205 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
1206 | tot_len, IPPROTO_TCP, | |
1207 | buff->csum); | |
1208 | ||
1209 | fl.proto = IPPROTO_TCP; | |
1210 | fl.oif = tcp_v6_iif(skb); | |
1211 | fl.fl_ip_dport = t1->dest; | |
1212 | fl.fl_ip_sport = t1->source; | |
1213 | ||
1214 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
1215 | if ((xfrm_lookup(&buff->dst, &fl, NULL, 0)) < 0) { | |
1216 | dst_release(buff->dst); | |
1217 | return; | |
1218 | } | |
1219 | ip6_xmit(NULL, buff, &fl, NULL, 0); | |
1220 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
1221 | return; | |
1222 | } | |
1223 | ||
1224 | kfree_skb(buff); | |
1225 | } | |
1226 | ||
1227 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1228 | { | |
8feaf0c0 ACM |
1229 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1230 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sk); | |
1da177e4 | 1231 | |
8feaf0c0 ACM |
1232 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
1233 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, | |
1234 | tcptw->tw_ts_recent); | |
1da177e4 | 1235 | |
8feaf0c0 | 1236 | inet_twsk_put(tw); |
1da177e4 LT |
1237 | } |
1238 | ||
60236fdd | 1239 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req) |
1da177e4 | 1240 | { |
2e6599cb | 1241 | 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 |
1242 | } |
1243 | ||
1244 | ||
1245 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
1246 | { | |
60236fdd | 1247 | struct request_sock *req, **prev; |
1da177e4 | 1248 | struct tcphdr *th = skb->h.th; |
1da177e4 LT |
1249 | struct sock *nsk; |
1250 | ||
1251 | /* Find possible connection requests. */ | |
463c84b9 | 1252 | req = tcp_v6_search_req(sk, &prev, th->source, &skb->nh.ipv6h->saddr, |
1da177e4 LT |
1253 | &skb->nh.ipv6h->daddr, tcp_v6_iif(skb)); |
1254 | if (req) | |
1255 | return tcp_check_req(sk, skb, req, prev); | |
1256 | ||
1257 | nsk = __tcp_v6_lookup_established(&skb->nh.ipv6h->saddr, | |
1258 | th->source, | |
1259 | &skb->nh.ipv6h->daddr, | |
1260 | ntohs(th->dest), | |
1261 | tcp_v6_iif(skb)); | |
1262 | ||
1263 | if (nsk) { | |
1264 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1265 | bh_lock_sock(nsk); | |
1266 | return nsk; | |
1267 | } | |
8feaf0c0 | 1268 | inet_twsk_put((struct inet_timewait_sock *)nsk); |
1da177e4 LT |
1269 | return NULL; |
1270 | } | |
1271 | ||
1272 | #if 0 /*def CONFIG_SYN_COOKIES*/ | |
1273 | if (!th->rst && !th->syn && th->ack) | |
1274 | sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt)); | |
1275 | #endif | |
1276 | return sk; | |
1277 | } | |
1278 | ||
60236fdd | 1279 | static void tcp_v6_synq_add(struct sock *sk, struct request_sock *req) |
1da177e4 | 1280 | { |
463c84b9 ACM |
1281 | struct inet_connection_sock *icsk = inet_csk(sk); |
1282 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
1283 | const u32 h = tcp_v6_synq_hash(&tcp6_rsk(req)->rmt_addr, inet_rsk(req)->rmt_port, lopt->hash_rnd); | |
1da177e4 | 1284 | |
463c84b9 ACM |
1285 | reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, TCP_TIMEOUT_INIT); |
1286 | inet_csk_reqsk_queue_added(sk, TCP_TIMEOUT_INIT); | |
1da177e4 LT |
1287 | } |
1288 | ||
1289 | ||
1290 | /* FIXME: this is substantially similar to the ipv4 code. | |
1291 | * Can some kind of merge be done? -- erics | |
1292 | */ | |
1293 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1294 | { | |
2e6599cb | 1295 | struct tcp6_request_sock *treq; |
1da177e4 LT |
1296 | struct ipv6_pinfo *np = inet6_sk(sk); |
1297 | struct tcp_options_received tmp_opt; | |
1298 | struct tcp_sock *tp = tcp_sk(sk); | |
60236fdd | 1299 | struct request_sock *req = NULL; |
1da177e4 LT |
1300 | __u32 isn = TCP_SKB_CB(skb)->when; |
1301 | ||
1302 | if (skb->protocol == htons(ETH_P_IP)) | |
1303 | return tcp_v4_conn_request(sk, skb); | |
1304 | ||
1305 | if (!ipv6_unicast_destination(skb)) | |
1306 | goto drop; | |
1307 | ||
1308 | /* | |
1309 | * There are no SYN attacks on IPv6, yet... | |
1310 | */ | |
463c84b9 | 1311 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 LT |
1312 | if (net_ratelimit()) |
1313 | printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n"); | |
1314 | goto drop; | |
1315 | } | |
1316 | ||
463c84b9 | 1317 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1318 | goto drop; |
1319 | ||
60236fdd | 1320 | req = reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1321 | if (req == NULL) |
1322 | goto drop; | |
1323 | ||
1324 | tcp_clear_options(&tmp_opt); | |
1325 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1326 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
1327 | ||
1328 | tcp_parse_options(skb, &tmp_opt, 0); | |
1329 | ||
1330 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; | |
1331 | tcp_openreq_init(req, &tmp_opt, skb); | |
1332 | ||
2e6599cb ACM |
1333 | treq = tcp6_rsk(req); |
1334 | ipv6_addr_copy(&treq->rmt_addr, &skb->nh.ipv6h->saddr); | |
1335 | ipv6_addr_copy(&treq->loc_addr, &skb->nh.ipv6h->daddr); | |
1da177e4 | 1336 | TCP_ECN_create_request(req, skb->h.th); |
2e6599cb | 1337 | treq->pktopts = NULL; |
1da177e4 LT |
1338 | if (ipv6_opt_accepted(sk, skb) || |
1339 | np->rxopt.bits.rxinfo || | |
1340 | np->rxopt.bits.rxhlim) { | |
1341 | atomic_inc(&skb->users); | |
2e6599cb | 1342 | treq->pktopts = skb; |
1da177e4 | 1343 | } |
2e6599cb | 1344 | treq->iif = sk->sk_bound_dev_if; |
1da177e4 LT |
1345 | |
1346 | /* So that link locals have meaning */ | |
1347 | if (!sk->sk_bound_dev_if && | |
2e6599cb ACM |
1348 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) |
1349 | treq->iif = tcp_v6_iif(skb); | |
1da177e4 LT |
1350 | |
1351 | if (isn == 0) | |
1352 | isn = tcp_v6_init_sequence(sk,skb); | |
1353 | ||
2e6599cb | 1354 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 LT |
1355 | |
1356 | if (tcp_v6_send_synack(sk, req, NULL)) | |
1357 | goto drop; | |
1358 | ||
1359 | tcp_v6_synq_add(sk, req); | |
1360 | ||
1361 | return 0; | |
1362 | ||
1363 | drop: | |
1364 | if (req) | |
60236fdd | 1365 | reqsk_free(req); |
1da177e4 LT |
1366 | |
1367 | TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS); | |
1368 | return 0; /* don't send reset */ | |
1369 | } | |
1370 | ||
1371 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1372 | struct request_sock *req, |
1da177e4 LT |
1373 | struct dst_entry *dst) |
1374 | { | |
2e6599cb | 1375 | struct tcp6_request_sock *treq = tcp6_rsk(req); |
1da177e4 LT |
1376 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1377 | struct tcp6_sock *newtcp6sk; | |
1378 | struct inet_sock *newinet; | |
1379 | struct tcp_sock *newtp; | |
1380 | struct sock *newsk; | |
1381 | struct ipv6_txoptions *opt; | |
1382 | ||
1383 | if (skb->protocol == htons(ETH_P_IP)) { | |
1384 | /* | |
1385 | * v6 mapped | |
1386 | */ | |
1387 | ||
1388 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1389 | ||
1390 | if (newsk == NULL) | |
1391 | return NULL; | |
1392 | ||
1393 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1394 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1395 | ||
1396 | newinet = inet_sk(newsk); | |
1397 | newnp = inet6_sk(newsk); | |
1398 | newtp = tcp_sk(newsk); | |
1399 | ||
1400 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1401 | ||
1402 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
1403 | newinet->daddr); | |
1404 | ||
1405 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
1406 | newinet->saddr); | |
1407 | ||
1408 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1409 | ||
1410 | newtp->af_specific = &ipv6_mapped; | |
1411 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; | |
1412 | newnp->pktoptions = NULL; | |
1413 | newnp->opt = NULL; | |
1414 | newnp->mcast_oif = tcp_v6_iif(skb); | |
1415 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; | |
1416 | ||
e6848976 ACM |
1417 | /* |
1418 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1419 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1420 | * that function for the gory details. -acme | |
1da177e4 | 1421 | */ |
1da177e4 LT |
1422 | |
1423 | /* It is tricky place. Until this moment IPv4 tcp | |
1424 | worked with IPv6 af_tcp.af_specific. | |
1425 | Sync it now. | |
1426 | */ | |
1427 | tcp_sync_mss(newsk, newtp->pmtu_cookie); | |
1428 | ||
1429 | return newsk; | |
1430 | } | |
1431 | ||
1432 | opt = np->opt; | |
1433 | ||
1434 | if (sk_acceptq_is_full(sk)) | |
1435 | goto out_overflow; | |
1436 | ||
1437 | if (np->rxopt.bits.srcrt == 2 && | |
2e6599cb ACM |
1438 | opt == NULL && treq->pktopts) { |
1439 | struct inet6_skb_parm *rxopt = IP6CB(treq->pktopts); | |
1da177e4 | 1440 | if (rxopt->srcrt) |
2e6599cb | 1441 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr *)(treq->pktopts->nh.raw + rxopt->srcrt)); |
1da177e4 LT |
1442 | } |
1443 | ||
1444 | if (dst == NULL) { | |
1445 | struct in6_addr *final_p = NULL, final; | |
1446 | struct flowi fl; | |
1447 | ||
1448 | memset(&fl, 0, sizeof(fl)); | |
1449 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1450 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
1451 | if (opt && opt->srcrt) { |
1452 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1453 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1454 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1455 | final_p = &final; | |
1456 | } | |
2e6599cb | 1457 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1458 | fl.oif = sk->sk_bound_dev_if; |
2e6599cb | 1459 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
1da177e4 LT |
1460 | fl.fl_ip_sport = inet_sk(sk)->sport; |
1461 | ||
1462 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1463 | goto out; | |
1464 | ||
1465 | if (final_p) | |
1466 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1467 | ||
1468 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
1469 | goto out; | |
1470 | } | |
1471 | ||
1472 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1473 | if (newsk == NULL) | |
1474 | goto out; | |
1475 | ||
e6848976 ACM |
1476 | /* |
1477 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1478 | * count here, tcp_create_openreq_child now does this for us, see the | |
1479 | * comment in that function for the gory details. -acme | |
1480 | */ | |
1da177e4 LT |
1481 | |
1482 | ip6_dst_store(newsk, dst, NULL); | |
1483 | newsk->sk_route_caps = dst->dev->features & | |
1484 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1485 | ||
1486 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1487 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1488 | ||
1489 | newtp = tcp_sk(newsk); | |
1490 | newinet = inet_sk(newsk); | |
1491 | newnp = inet6_sk(newsk); | |
1492 | ||
1493 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1494 | ||
2e6599cb ACM |
1495 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1496 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1497 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1498 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 LT |
1499 | |
1500 | /* Now IPv6 options... | |
1501 | ||
1502 | First: no IPv4 options. | |
1503 | */ | |
1504 | newinet->opt = NULL; | |
1505 | ||
1506 | /* Clone RX bits */ | |
1507 | newnp->rxopt.all = np->rxopt.all; | |
1508 | ||
1509 | /* Clone pktoptions received with SYN */ | |
1510 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1511 | if (treq->pktopts != NULL) { |
1512 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1513 | kfree_skb(treq->pktopts); | |
1514 | treq->pktopts = NULL; | |
1da177e4 LT |
1515 | if (newnp->pktoptions) |
1516 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1517 | } | |
1518 | newnp->opt = NULL; | |
1519 | newnp->mcast_oif = tcp_v6_iif(skb); | |
1520 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; | |
1521 | ||
1522 | /* Clone native IPv6 options from listening socket (if any) | |
1523 | ||
1524 | Yes, keeping reference count would be much more clever, | |
1525 | but we make one more one thing there: reattach optmem | |
1526 | to newsk. | |
1527 | */ | |
1528 | if (opt) { | |
1529 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1530 | if (opt != np->opt) | |
1531 | sock_kfree_s(sk, opt, opt->tot_len); | |
1532 | } | |
1533 | ||
1534 | newtp->ext_header_len = 0; | |
1535 | if (newnp->opt) | |
1536 | newtp->ext_header_len = newnp->opt->opt_nflen + | |
1537 | newnp->opt->opt_flen; | |
1538 | ||
1539 | tcp_sync_mss(newsk, dst_mtu(dst)); | |
1540 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1541 | tcp_initialize_rcv_mss(newsk); | |
1542 | ||
1543 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
1544 | ||
1545 | __tcp_v6_hash(newsk); | |
2d8c4ce5 | 1546 | inet_inherit_port(&tcp_hashinfo, sk, newsk); |
1da177e4 LT |
1547 | |
1548 | return newsk; | |
1549 | ||
1550 | out_overflow: | |
1551 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
1552 | out: | |
1553 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
1554 | if (opt && opt != np->opt) | |
1555 | sock_kfree_s(sk, opt, opt->tot_len); | |
1556 | dst_release(dst); | |
1557 | return NULL; | |
1558 | } | |
1559 | ||
1560 | static int tcp_v6_checksum_init(struct sk_buff *skb) | |
1561 | { | |
1562 | if (skb->ip_summed == CHECKSUM_HW) { | |
1563 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1564 | if (!tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, | |
1565 | &skb->nh.ipv6h->daddr,skb->csum)) | |
1566 | return 0; | |
1567 | LIMIT_NETDEBUG(printk(KERN_DEBUG "hw tcp v6 csum failed\n")); | |
1568 | } | |
1569 | if (skb->len <= 76) { | |
1570 | if (tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, | |
1571 | &skb->nh.ipv6h->daddr,skb_checksum(skb, 0, skb->len, 0))) | |
1572 | return -1; | |
1573 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1574 | } else { | |
1575 | skb->csum = ~tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, | |
1576 | &skb->nh.ipv6h->daddr,0); | |
1577 | } | |
1578 | return 0; | |
1579 | } | |
1580 | ||
1581 | /* The socket must have it's spinlock held when we get | |
1582 | * here. | |
1583 | * | |
1584 | * We have a potential double-lock case here, so even when | |
1585 | * doing backlog processing we use the BH locking scheme. | |
1586 | * This is because we cannot sleep with the original spinlock | |
1587 | * held. | |
1588 | */ | |
1589 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1590 | { | |
1591 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1592 | struct tcp_sock *tp; | |
1593 | struct sk_buff *opt_skb = NULL; | |
1594 | ||
1595 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1596 | goes to IPv4 receive handler and backlogged. | |
1597 | From backlog it always goes here. Kerboom... | |
1598 | Fortunately, tcp_rcv_established and rcv_established | |
1599 | handle them correctly, but it is not case with | |
1600 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1601 | */ | |
1602 | ||
1603 | if (skb->protocol == htons(ETH_P_IP)) | |
1604 | return tcp_v4_do_rcv(sk, skb); | |
1605 | ||
1606 | if (sk_filter(sk, skb, 0)) | |
1607 | goto discard; | |
1608 | ||
1609 | /* | |
1610 | * socket locking is here for SMP purposes as backlog rcv | |
1611 | * is currently called with bh processing disabled. | |
1612 | */ | |
1613 | ||
1614 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1615 | ||
1616 | Yes, guys, it is the only place in our code, where we | |
1617 | may make it not affecting IPv4. | |
1618 | The rest of code is protocol independent, | |
1619 | and I do not like idea to uglify IPv4. | |
1620 | ||
1621 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1622 | looks not very well thought. For now we latch | |
1623 | options, received in the last packet, enqueued | |
1624 | by tcp. Feel free to propose better solution. | |
1625 | --ANK (980728) | |
1626 | */ | |
1627 | if (np->rxopt.all) | |
1628 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1629 | ||
1630 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1631 | TCP_CHECK_TIMER(sk); | |
1632 | if (tcp_rcv_established(sk, skb, skb->h.th, skb->len)) | |
1633 | goto reset; | |
1634 | TCP_CHECK_TIMER(sk); | |
1635 | if (opt_skb) | |
1636 | goto ipv6_pktoptions; | |
1637 | return 0; | |
1638 | } | |
1639 | ||
1640 | if (skb->len < (skb->h.th->doff<<2) || tcp_checksum_complete(skb)) | |
1641 | goto csum_err; | |
1642 | ||
1643 | if (sk->sk_state == TCP_LISTEN) { | |
1644 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); | |
1645 | if (!nsk) | |
1646 | goto discard; | |
1647 | ||
1648 | /* | |
1649 | * Queue it on the new socket if the new socket is active, | |
1650 | * otherwise we just shortcircuit this and continue with | |
1651 | * the new socket.. | |
1652 | */ | |
1653 | if(nsk != sk) { | |
1654 | if (tcp_child_process(sk, nsk, skb)) | |
1655 | goto reset; | |
1656 | if (opt_skb) | |
1657 | __kfree_skb(opt_skb); | |
1658 | return 0; | |
1659 | } | |
1660 | } | |
1661 | ||
1662 | TCP_CHECK_TIMER(sk); | |
1663 | if (tcp_rcv_state_process(sk, skb, skb->h.th, skb->len)) | |
1664 | goto reset; | |
1665 | TCP_CHECK_TIMER(sk); | |
1666 | if (opt_skb) | |
1667 | goto ipv6_pktoptions; | |
1668 | return 0; | |
1669 | ||
1670 | reset: | |
1671 | tcp_v6_send_reset(skb); | |
1672 | discard: | |
1673 | if (opt_skb) | |
1674 | __kfree_skb(opt_skb); | |
1675 | kfree_skb(skb); | |
1676 | return 0; | |
1677 | csum_err: | |
1678 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1679 | goto discard; | |
1680 | ||
1681 | ||
1682 | ipv6_pktoptions: | |
1683 | /* Do you ask, what is it? | |
1684 | ||
1685 | 1. skb was enqueued by tcp. | |
1686 | 2. skb is added to tail of read queue, rather than out of order. | |
1687 | 3. socket is not in passive state. | |
1688 | 4. Finally, it really contains options, which user wants to receive. | |
1689 | */ | |
1690 | tp = tcp_sk(sk); | |
1691 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1692 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
1693 | if (np->rxopt.bits.rxinfo) | |
1694 | np->mcast_oif = tcp_v6_iif(opt_skb); | |
1695 | if (np->rxopt.bits.rxhlim) | |
1696 | np->mcast_hops = opt_skb->nh.ipv6h->hop_limit; | |
1697 | if (ipv6_opt_accepted(sk, opt_skb)) { | |
1698 | skb_set_owner_r(opt_skb, sk); | |
1699 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1700 | } else { | |
1701 | __kfree_skb(opt_skb); | |
1702 | opt_skb = xchg(&np->pktoptions, NULL); | |
1703 | } | |
1704 | } | |
1705 | ||
1706 | if (opt_skb) | |
1707 | kfree_skb(opt_skb); | |
1708 | return 0; | |
1709 | } | |
1710 | ||
1711 | static int tcp_v6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) | |
1712 | { | |
1713 | struct sk_buff *skb = *pskb; | |
1714 | struct tcphdr *th; | |
1715 | struct sock *sk; | |
1716 | int ret; | |
1717 | ||
1718 | if (skb->pkt_type != PACKET_HOST) | |
1719 | goto discard_it; | |
1720 | ||
1721 | /* | |
1722 | * Count it even if it's bad. | |
1723 | */ | |
1724 | TCP_INC_STATS_BH(TCP_MIB_INSEGS); | |
1725 | ||
1726 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1727 | goto discard_it; | |
1728 | ||
1729 | th = skb->h.th; | |
1730 | ||
1731 | if (th->doff < sizeof(struct tcphdr)/4) | |
1732 | goto bad_packet; | |
1733 | if (!pskb_may_pull(skb, th->doff*4)) | |
1734 | goto discard_it; | |
1735 | ||
1736 | if ((skb->ip_summed != CHECKSUM_UNNECESSARY && | |
1737 | tcp_v6_checksum_init(skb) < 0)) | |
1738 | goto bad_packet; | |
1739 | ||
1740 | th = skb->h.th; | |
1741 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1742 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1743 | skb->len - th->doff*4); | |
1744 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1745 | TCP_SKB_CB(skb)->when = 0; | |
1746 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(skb->nh.ipv6h); | |
1747 | TCP_SKB_CB(skb)->sacked = 0; | |
1748 | ||
1749 | sk = __tcp_v6_lookup(&skb->nh.ipv6h->saddr, th->source, | |
1750 | &skb->nh.ipv6h->daddr, ntohs(th->dest), tcp_v6_iif(skb)); | |
1751 | ||
1752 | if (!sk) | |
1753 | goto no_tcp_socket; | |
1754 | ||
1755 | process: | |
1756 | if (sk->sk_state == TCP_TIME_WAIT) | |
1757 | goto do_time_wait; | |
1758 | ||
1759 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1760 | goto discard_and_relse; | |
1761 | ||
1762 | if (sk_filter(sk, skb, 0)) | |
1763 | goto discard_and_relse; | |
1764 | ||
1765 | skb->dev = NULL; | |
1766 | ||
1767 | bh_lock_sock(sk); | |
1768 | ret = 0; | |
1769 | if (!sock_owned_by_user(sk)) { | |
1770 | if (!tcp_prequeue(sk, skb)) | |
1771 | ret = tcp_v6_do_rcv(sk, skb); | |
1772 | } else | |
1773 | sk_add_backlog(sk, skb); | |
1774 | bh_unlock_sock(sk); | |
1775 | ||
1776 | sock_put(sk); | |
1777 | return ret ? -1 : 0; | |
1778 | ||
1779 | no_tcp_socket: | |
1780 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1781 | goto discard_it; | |
1782 | ||
1783 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1784 | bad_packet: | |
1785 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1786 | } else { | |
1787 | tcp_v6_send_reset(skb); | |
1788 | } | |
1789 | ||
1790 | discard_it: | |
1791 | ||
1792 | /* | |
1793 | * Discard frame | |
1794 | */ | |
1795 | ||
1796 | kfree_skb(skb); | |
1797 | return 0; | |
1798 | ||
1799 | discard_and_relse: | |
1800 | sock_put(sk); | |
1801 | goto discard_it; | |
1802 | ||
1803 | do_time_wait: | |
1804 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
8feaf0c0 | 1805 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
1806 | goto discard_it; |
1807 | } | |
1808 | ||
1809 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1810 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
8feaf0c0 | 1811 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
1812 | goto discard_it; |
1813 | } | |
1814 | ||
8feaf0c0 ACM |
1815 | switch (tcp_timewait_state_process((struct inet_timewait_sock *)sk, |
1816 | skb, th)) { | |
1da177e4 LT |
1817 | case TCP_TW_SYN: |
1818 | { | |
1819 | struct sock *sk2; | |
1820 | ||
1821 | sk2 = tcp_v6_lookup_listener(&skb->nh.ipv6h->daddr, ntohs(th->dest), tcp_v6_iif(skb)); | |
1822 | if (sk2 != NULL) { | |
8feaf0c0 ACM |
1823 | tcp_tw_deschedule((struct inet_timewait_sock *)sk); |
1824 | inet_twsk_put((struct inet_timewait_sock *)sk); | |
1da177e4 LT |
1825 | sk = sk2; |
1826 | goto process; | |
1827 | } | |
1828 | /* Fall through to ACK */ | |
1829 | } | |
1830 | case TCP_TW_ACK: | |
1831 | tcp_v6_timewait_ack(sk, skb); | |
1832 | break; | |
1833 | case TCP_TW_RST: | |
1834 | goto no_tcp_socket; | |
1835 | case TCP_TW_SUCCESS:; | |
1836 | } | |
1837 | goto discard_it; | |
1838 | } | |
1839 | ||
1840 | static int tcp_v6_rebuild_header(struct sock *sk) | |
1841 | { | |
1842 | int err; | |
1843 | struct dst_entry *dst; | |
1844 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1845 | ||
1846 | dst = __sk_dst_check(sk, np->dst_cookie); | |
1847 | ||
1848 | if (dst == NULL) { | |
1849 | struct inet_sock *inet = inet_sk(sk); | |
1850 | struct in6_addr *final_p = NULL, final; | |
1851 | struct flowi fl; | |
1852 | ||
1853 | memset(&fl, 0, sizeof(fl)); | |
1854 | fl.proto = IPPROTO_TCP; | |
1855 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
1856 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
1857 | fl.fl6_flowlabel = np->flow_label; | |
1858 | fl.oif = sk->sk_bound_dev_if; | |
1859 | fl.fl_ip_dport = inet->dport; | |
1860 | fl.fl_ip_sport = inet->sport; | |
1861 | ||
1862 | if (np->opt && np->opt->srcrt) { | |
1863 | struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; | |
1864 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1865 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1866 | final_p = &final; | |
1867 | } | |
1868 | ||
1869 | err = ip6_dst_lookup(sk, &dst, &fl); | |
1870 | if (err) { | |
1871 | sk->sk_route_caps = 0; | |
1872 | return err; | |
1873 | } | |
1874 | if (final_p) | |
1875 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1876 | ||
1877 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
1878 | sk->sk_err_soft = -err; | |
1879 | dst_release(dst); | |
1880 | return err; | |
1881 | } | |
1882 | ||
1883 | ip6_dst_store(sk, dst, NULL); | |
1884 | sk->sk_route_caps = dst->dev->features & | |
1885 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1886 | } | |
1887 | ||
1888 | return 0; | |
1889 | } | |
1890 | ||
1891 | static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok) | |
1892 | { | |
1893 | struct sock *sk = skb->sk; | |
1894 | struct inet_sock *inet = inet_sk(sk); | |
1895 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1896 | struct flowi fl; | |
1897 | struct dst_entry *dst; | |
1898 | struct in6_addr *final_p = NULL, final; | |
1899 | ||
1900 | memset(&fl, 0, sizeof(fl)); | |
1901 | fl.proto = IPPROTO_TCP; | |
1902 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
1903 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
1904 | fl.fl6_flowlabel = np->flow_label; | |
1905 | IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); | |
1906 | fl.oif = sk->sk_bound_dev_if; | |
1907 | fl.fl_ip_sport = inet->sport; | |
1908 | fl.fl_ip_dport = inet->dport; | |
1909 | ||
1910 | if (np->opt && np->opt->srcrt) { | |
1911 | struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; | |
1912 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1913 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1914 | final_p = &final; | |
1915 | } | |
1916 | ||
1917 | dst = __sk_dst_check(sk, np->dst_cookie); | |
1918 | ||
1919 | if (dst == NULL) { | |
1920 | int err = ip6_dst_lookup(sk, &dst, &fl); | |
1921 | ||
1922 | if (err) { | |
1923 | sk->sk_err_soft = -err; | |
1924 | return err; | |
1925 | } | |
1926 | ||
1927 | if (final_p) | |
1928 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1929 | ||
1930 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
1931 | sk->sk_route_caps = 0; | |
1932 | dst_release(dst); | |
1933 | return err; | |
1934 | } | |
1935 | ||
1936 | ip6_dst_store(sk, dst, NULL); | |
1937 | sk->sk_route_caps = dst->dev->features & | |
1938 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1939 | } | |
1940 | ||
1941 | skb->dst = dst_clone(dst); | |
1942 | ||
1943 | /* Restore final destination back after routing done */ | |
1944 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
1945 | ||
1946 | return ip6_xmit(sk, skb, &fl, np->opt, 0); | |
1947 | } | |
1948 | ||
1949 | static void v6_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) | |
1950 | { | |
1951 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1952 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; | |
1953 | ||
1954 | sin6->sin6_family = AF_INET6; | |
1955 | ipv6_addr_copy(&sin6->sin6_addr, &np->daddr); | |
1956 | sin6->sin6_port = inet_sk(sk)->dport; | |
1957 | /* We do not store received flowlabel for TCP */ | |
1958 | sin6->sin6_flowinfo = 0; | |
1959 | sin6->sin6_scope_id = 0; | |
1960 | if (sk->sk_bound_dev_if && | |
1961 | ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
1962 | sin6->sin6_scope_id = sk->sk_bound_dev_if; | |
1963 | } | |
1964 | ||
1965 | static int tcp_v6_remember_stamp(struct sock *sk) | |
1966 | { | |
1967 | /* Alas, not yet... */ | |
1968 | return 0; | |
1969 | } | |
1970 | ||
1971 | static struct tcp_func ipv6_specific = { | |
1972 | .queue_xmit = tcp_v6_xmit, | |
1973 | .send_check = tcp_v6_send_check, | |
1974 | .rebuild_header = tcp_v6_rebuild_header, | |
1975 | .conn_request = tcp_v6_conn_request, | |
1976 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1977 | .remember_stamp = tcp_v6_remember_stamp, | |
1978 | .net_header_len = sizeof(struct ipv6hdr), | |
1979 | ||
1980 | .setsockopt = ipv6_setsockopt, | |
1981 | .getsockopt = ipv6_getsockopt, | |
1982 | .addr2sockaddr = v6_addr2sockaddr, | |
1983 | .sockaddr_len = sizeof(struct sockaddr_in6) | |
1984 | }; | |
1985 | ||
1986 | /* | |
1987 | * TCP over IPv4 via INET6 API | |
1988 | */ | |
1989 | ||
1990 | static struct tcp_func ipv6_mapped = { | |
1991 | .queue_xmit = ip_queue_xmit, | |
1992 | .send_check = tcp_v4_send_check, | |
32519f11 | 1993 | .rebuild_header = inet_sk_rebuild_header, |
1da177e4 LT |
1994 | .conn_request = tcp_v6_conn_request, |
1995 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1996 | .remember_stamp = tcp_v4_remember_stamp, | |
1997 | .net_header_len = sizeof(struct iphdr), | |
1998 | ||
1999 | .setsockopt = ipv6_setsockopt, | |
2000 | .getsockopt = ipv6_getsockopt, | |
2001 | .addr2sockaddr = v6_addr2sockaddr, | |
2002 | .sockaddr_len = sizeof(struct sockaddr_in6) | |
2003 | }; | |
2004 | ||
2005 | ||
2006 | ||
2007 | /* NOTE: A lot of things set to zero explicitly by call to | |
2008 | * sk_alloc() so need not be done here. | |
2009 | */ | |
2010 | static int tcp_v6_init_sock(struct sock *sk) | |
2011 | { | |
2012 | struct tcp_sock *tp = tcp_sk(sk); | |
2013 | ||
2014 | skb_queue_head_init(&tp->out_of_order_queue); | |
2015 | tcp_init_xmit_timers(sk); | |
2016 | tcp_prequeue_init(tp); | |
2017 | ||
463c84b9 | 2018 | inet_csk(sk)->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
2019 | tp->mdev = TCP_TIMEOUT_INIT; |
2020 | ||
2021 | /* So many TCP implementations out there (incorrectly) count the | |
2022 | * initial SYN frame in their delayed-ACK and congestion control | |
2023 | * algorithms that we must have the following bandaid to talk | |
2024 | * efficiently to them. -DaveM | |
2025 | */ | |
2026 | tp->snd_cwnd = 2; | |
2027 | ||
2028 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
2029 | * initialization of these values. | |
2030 | */ | |
2031 | tp->snd_ssthresh = 0x7fffffff; | |
2032 | tp->snd_cwnd_clamp = ~0; | |
c1b4a7e6 | 2033 | tp->mss_cache = 536; |
1da177e4 LT |
2034 | |
2035 | tp->reordering = sysctl_tcp_reordering; | |
2036 | ||
2037 | sk->sk_state = TCP_CLOSE; | |
2038 | ||
2039 | tp->af_specific = &ipv6_specific; | |
5f8ef48d | 2040 | tp->ca_ops = &tcp_init_congestion_ops; |
1da177e4 LT |
2041 | sk->sk_write_space = sk_stream_write_space; |
2042 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
2043 | ||
2044 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; | |
2045 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
2046 | ||
2047 | atomic_inc(&tcp_sockets_allocated); | |
2048 | ||
2049 | return 0; | |
2050 | } | |
2051 | ||
2052 | static int tcp_v6_destroy_sock(struct sock *sk) | |
2053 | { | |
2054 | extern int tcp_v4_destroy_sock(struct sock *sk); | |
2055 | ||
2056 | tcp_v4_destroy_sock(sk); | |
2057 | return inet6_destroy_sock(sk); | |
2058 | } | |
2059 | ||
2060 | /* Proc filesystem TCPv6 sock list dumping. */ | |
2061 | static void get_openreq6(struct seq_file *seq, | |
60236fdd | 2062 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 LT |
2063 | { |
2064 | struct in6_addr *dest, *src; | |
2065 | int ttd = req->expires - jiffies; | |
2066 | ||
2067 | if (ttd < 0) | |
2068 | ttd = 0; | |
2069 | ||
2e6599cb ACM |
2070 | src = &tcp6_rsk(req)->loc_addr; |
2071 | dest = &tcp6_rsk(req)->rmt_addr; | |
1da177e4 LT |
2072 | seq_printf(seq, |
2073 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2074 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
2075 | i, | |
2076 | src->s6_addr32[0], src->s6_addr32[1], | |
2077 | src->s6_addr32[2], src->s6_addr32[3], | |
2078 | ntohs(inet_sk(sk)->sport), | |
2079 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2080 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 2081 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
2082 | TCP_SYN_RECV, |
2083 | 0,0, /* could print option size, but that is af dependent. */ | |
2084 | 1, /* timers active (only the expire timer) */ | |
2085 | jiffies_to_clock_t(ttd), | |
2086 | req->retrans, | |
2087 | uid, | |
2088 | 0, /* non standard timer */ | |
2089 | 0, /* open_requests have no inode */ | |
2090 | 0, req); | |
2091 | } | |
2092 | ||
2093 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
2094 | { | |
2095 | struct in6_addr *dest, *src; | |
2096 | __u16 destp, srcp; | |
2097 | int timer_active; | |
2098 | unsigned long timer_expires; | |
2099 | struct inet_sock *inet = inet_sk(sp); | |
2100 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 2101 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
2102 | struct ipv6_pinfo *np = inet6_sk(sp); |
2103 | ||
2104 | dest = &np->daddr; | |
2105 | src = &np->rcv_saddr; | |
2106 | destp = ntohs(inet->dport); | |
2107 | srcp = ntohs(inet->sport); | |
463c84b9 ACM |
2108 | |
2109 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 2110 | timer_active = 1; |
463c84b9 ACM |
2111 | timer_expires = icsk->icsk_timeout; |
2112 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 2113 | timer_active = 4; |
463c84b9 | 2114 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
2115 | } else if (timer_pending(&sp->sk_timer)) { |
2116 | timer_active = 2; | |
2117 | timer_expires = sp->sk_timer.expires; | |
2118 | } else { | |
2119 | timer_active = 0; | |
2120 | timer_expires = jiffies; | |
2121 | } | |
2122 | ||
2123 | seq_printf(seq, | |
2124 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2125 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n", | |
2126 | i, | |
2127 | src->s6_addr32[0], src->s6_addr32[1], | |
2128 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2129 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2130 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2131 | sp->sk_state, | |
2132 | tp->write_seq-tp->snd_una, tp->rcv_nxt-tp->copied_seq, | |
2133 | timer_active, | |
2134 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 2135 | icsk->icsk_retransmits, |
1da177e4 LT |
2136 | sock_i_uid(sp), |
2137 | tp->probes_out, | |
2138 | sock_i_ino(sp), | |
2139 | atomic_read(&sp->sk_refcnt), sp, | |
463c84b9 ACM |
2140 | icsk->icsk_rto, |
2141 | icsk->icsk_ack.ato, | |
2142 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, | |
1da177e4 LT |
2143 | tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh |
2144 | ); | |
2145 | } | |
2146 | ||
2147 | static void get_timewait6_sock(struct seq_file *seq, | |
8feaf0c0 | 2148 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
2149 | { |
2150 | struct in6_addr *dest, *src; | |
2151 | __u16 destp, srcp; | |
8feaf0c0 | 2152 | struct tcp6_timewait_sock *tcp6tw = tcp6_twsk((struct sock *)tw); |
1da177e4 LT |
2153 | int ttd = tw->tw_ttd - jiffies; |
2154 | ||
2155 | if (ttd < 0) | |
2156 | ttd = 0; | |
2157 | ||
8feaf0c0 ACM |
2158 | dest = &tcp6tw->tw_v6_daddr; |
2159 | src = &tcp6tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
2160 | destp = ntohs(tw->tw_dport); |
2161 | srcp = ntohs(tw->tw_sport); | |
2162 | ||
2163 | seq_printf(seq, | |
2164 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2165 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
2166 | i, | |
2167 | src->s6_addr32[0], src->s6_addr32[1], | |
2168 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2169 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2170 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2171 | tw->tw_substate, 0, 0, | |
2172 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2173 | atomic_read(&tw->tw_refcnt), tw); | |
2174 | } | |
2175 | ||
2176 | #ifdef CONFIG_PROC_FS | |
2177 | static int tcp6_seq_show(struct seq_file *seq, void *v) | |
2178 | { | |
2179 | struct tcp_iter_state *st; | |
2180 | ||
2181 | if (v == SEQ_START_TOKEN) { | |
2182 | seq_puts(seq, | |
2183 | " sl " | |
2184 | "local_address " | |
2185 | "remote_address " | |
2186 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2187 | " uid timeout inode\n"); | |
2188 | goto out; | |
2189 | } | |
2190 | st = seq->private; | |
2191 | ||
2192 | switch (st->state) { | |
2193 | case TCP_SEQ_STATE_LISTENING: | |
2194 | case TCP_SEQ_STATE_ESTABLISHED: | |
2195 | get_tcp6_sock(seq, v, st->num); | |
2196 | break; | |
2197 | case TCP_SEQ_STATE_OPENREQ: | |
2198 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
2199 | break; | |
2200 | case TCP_SEQ_STATE_TIME_WAIT: | |
2201 | get_timewait6_sock(seq, v, st->num); | |
2202 | break; | |
2203 | } | |
2204 | out: | |
2205 | return 0; | |
2206 | } | |
2207 | ||
2208 | static struct file_operations tcp6_seq_fops; | |
2209 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { | |
2210 | .owner = THIS_MODULE, | |
2211 | .name = "tcp6", | |
2212 | .family = AF_INET6, | |
2213 | .seq_show = tcp6_seq_show, | |
2214 | .seq_fops = &tcp6_seq_fops, | |
2215 | }; | |
2216 | ||
2217 | int __init tcp6_proc_init(void) | |
2218 | { | |
2219 | return tcp_proc_register(&tcp6_seq_afinfo); | |
2220 | } | |
2221 | ||
2222 | void tcp6_proc_exit(void) | |
2223 | { | |
2224 | tcp_proc_unregister(&tcp6_seq_afinfo); | |
2225 | } | |
2226 | #endif | |
2227 | ||
2228 | struct proto tcpv6_prot = { | |
2229 | .name = "TCPv6", | |
2230 | .owner = THIS_MODULE, | |
2231 | .close = tcp_close, | |
2232 | .connect = tcp_v6_connect, | |
2233 | .disconnect = tcp_disconnect, | |
463c84b9 | 2234 | .accept = inet_csk_accept, |
1da177e4 LT |
2235 | .ioctl = tcp_ioctl, |
2236 | .init = tcp_v6_init_sock, | |
2237 | .destroy = tcp_v6_destroy_sock, | |
2238 | .shutdown = tcp_shutdown, | |
2239 | .setsockopt = tcp_setsockopt, | |
2240 | .getsockopt = tcp_getsockopt, | |
2241 | .sendmsg = tcp_sendmsg, | |
2242 | .recvmsg = tcp_recvmsg, | |
2243 | .backlog_rcv = tcp_v6_do_rcv, | |
2244 | .hash = tcp_v6_hash, | |
2245 | .unhash = tcp_unhash, | |
2246 | .get_port = tcp_v6_get_port, | |
2247 | .enter_memory_pressure = tcp_enter_memory_pressure, | |
2248 | .sockets_allocated = &tcp_sockets_allocated, | |
2249 | .memory_allocated = &tcp_memory_allocated, | |
2250 | .memory_pressure = &tcp_memory_pressure, | |
2251 | .sysctl_mem = sysctl_tcp_mem, | |
2252 | .sysctl_wmem = sysctl_tcp_wmem, | |
2253 | .sysctl_rmem = sysctl_tcp_rmem, | |
2254 | .max_header = MAX_TCP_HEADER, | |
2255 | .obj_size = sizeof(struct tcp6_sock), | |
8feaf0c0 | 2256 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), |
60236fdd | 2257 | .rsk_prot = &tcp6_request_sock_ops, |
1da177e4 LT |
2258 | }; |
2259 | ||
2260 | static struct inet6_protocol tcpv6_protocol = { | |
2261 | .handler = tcp_v6_rcv, | |
2262 | .err_handler = tcp_v6_err, | |
2263 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
2264 | }; | |
2265 | ||
2266 | extern struct proto_ops inet6_stream_ops; | |
2267 | ||
2268 | static struct inet_protosw tcpv6_protosw = { | |
2269 | .type = SOCK_STREAM, | |
2270 | .protocol = IPPROTO_TCP, | |
2271 | .prot = &tcpv6_prot, | |
2272 | .ops = &inet6_stream_ops, | |
2273 | .capability = -1, | |
2274 | .no_check = 0, | |
2275 | .flags = INET_PROTOSW_PERMANENT, | |
2276 | }; | |
2277 | ||
2278 | void __init tcpv6_init(void) | |
2279 | { | |
2280 | /* register inet6 protocol */ | |
2281 | if (inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP) < 0) | |
2282 | printk(KERN_ERR "tcpv6_init: Could not register protocol\n"); | |
2283 | inet6_register_protosw(&tcpv6_protosw); | |
2284 | } |