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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> | |
5324a040 | 50 | #include <net/inet6_hashtables.h> |
1da177e4 LT |
51 | #include <net/ipv6.h> |
52 | #include <net/transp_v6.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/ip6_route.h> | |
55 | #include <net/ip6_checksum.h> | |
56 | #include <net/inet_ecn.h> | |
57 | #include <net/protocol.h> | |
58 | #include <net/xfrm.h> | |
59 | #include <net/addrconf.h> | |
60 | #include <net/snmp.h> | |
61 | #include <net/dsfield.h> | |
62 | ||
63 | #include <asm/uaccess.h> | |
64 | ||
65 | #include <linux/proc_fs.h> | |
66 | #include <linux/seq_file.h> | |
67 | ||
68 | static void tcp_v6_send_reset(struct sk_buff *skb); | |
60236fdd | 69 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req); |
1da177e4 LT |
70 | static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len, |
71 | struct sk_buff *skb); | |
72 | ||
73 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
74 | static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok); | |
75 | ||
76 | static struct tcp_func ipv6_mapped; | |
77 | static struct tcp_func ipv6_specific; | |
78 | ||
971af18b ACM |
79 | int inet6_csk_bind_conflict(const struct sock *sk, |
80 | const struct inet_bind_bucket *tb) | |
1da177e4 | 81 | { |
0f7ff927 ACM |
82 | const struct sock *sk2; |
83 | const struct hlist_node *node; | |
1da177e4 LT |
84 | |
85 | /* We must walk the whole port owner list in this case. -DaveM */ | |
86 | sk_for_each_bound(sk2, node, &tb->owners) { | |
87 | if (sk != sk2 && | |
88 | (!sk->sk_bound_dev_if || | |
89 | !sk2->sk_bound_dev_if || | |
90 | sk->sk_bound_dev_if == sk2->sk_bound_dev_if) && | |
91 | (!sk->sk_reuse || !sk2->sk_reuse || | |
92 | sk2->sk_state == TCP_LISTEN) && | |
93 | ipv6_rcv_saddr_equal(sk, sk2)) | |
94 | break; | |
95 | } | |
96 | ||
97 | return node != NULL; | |
98 | } | |
99 | ||
1da177e4 LT |
100 | static int tcp_v6_get_port(struct sock *sk, unsigned short snum) |
101 | { | |
971af18b ACM |
102 | return inet_csk_get_port(&tcp_hashinfo, sk, snum, |
103 | inet6_csk_bind_conflict); | |
1da177e4 LT |
104 | } |
105 | ||
1da177e4 LT |
106 | static void tcp_v6_hash(struct sock *sk) |
107 | { | |
108 | if (sk->sk_state != TCP_CLOSE) { | |
109 | struct tcp_sock *tp = tcp_sk(sk); | |
110 | ||
111 | if (tp->af_specific == &ipv6_mapped) { | |
112 | tcp_prot.hash(sk); | |
113 | return; | |
114 | } | |
115 | local_bh_disable(); | |
90b19d31 | 116 | __inet6_hash(&tcp_hashinfo, sk); |
1da177e4 LT |
117 | local_bh_enable(); |
118 | } | |
119 | } | |
120 | ||
1da177e4 LT |
121 | /* |
122 | * Open request hash tables. | |
123 | */ | |
124 | ||
463c84b9 | 125 | static u32 tcp_v6_synq_hash(const struct in6_addr *raddr, const u16 rport, const u32 rnd) |
1da177e4 LT |
126 | { |
127 | u32 a, b, c; | |
128 | ||
129 | a = raddr->s6_addr32[0]; | |
130 | b = raddr->s6_addr32[1]; | |
131 | c = raddr->s6_addr32[2]; | |
132 | ||
133 | a += JHASH_GOLDEN_RATIO; | |
134 | b += JHASH_GOLDEN_RATIO; | |
135 | c += rnd; | |
136 | __jhash_mix(a, b, c); | |
137 | ||
138 | a += raddr->s6_addr32[3]; | |
139 | b += (u32) rport; | |
140 | __jhash_mix(a, b, c); | |
141 | ||
142 | return c & (TCP_SYNQ_HSIZE - 1); | |
143 | } | |
144 | ||
463c84b9 | 145 | static struct request_sock *tcp_v6_search_req(const struct sock *sk, |
60236fdd | 146 | struct request_sock ***prevp, |
1da177e4 LT |
147 | __u16 rport, |
148 | struct in6_addr *raddr, | |
149 | struct in6_addr *laddr, | |
150 | int iif) | |
151 | { | |
463c84b9 ACM |
152 | const struct inet_connection_sock *icsk = inet_csk(sk); |
153 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
60236fdd | 154 | struct request_sock *req, **prev; |
1da177e4 LT |
155 | |
156 | for (prev = &lopt->syn_table[tcp_v6_synq_hash(raddr, rport, lopt->hash_rnd)]; | |
157 | (req = *prev) != NULL; | |
158 | prev = &req->dl_next) { | |
2e6599cb ACM |
159 | const struct tcp6_request_sock *treq = tcp6_rsk(req); |
160 | ||
161 | if (inet_rsk(req)->rmt_port == rport && | |
60236fdd | 162 | req->rsk_ops->family == AF_INET6 && |
2e6599cb ACM |
163 | ipv6_addr_equal(&treq->rmt_addr, raddr) && |
164 | ipv6_addr_equal(&treq->loc_addr, laddr) && | |
165 | (!treq->iif || treq->iif == iif)) { | |
1da177e4 LT |
166 | BUG_TRAP(req->sk == NULL); |
167 | *prevp = prev; | |
168 | return req; | |
169 | } | |
170 | } | |
171 | ||
172 | return NULL; | |
173 | } | |
174 | ||
175 | static __inline__ u16 tcp_v6_check(struct tcphdr *th, int len, | |
176 | struct in6_addr *saddr, | |
177 | struct in6_addr *daddr, | |
178 | unsigned long base) | |
179 | { | |
180 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
181 | } | |
182 | ||
183 | static __u32 tcp_v6_init_sequence(struct sock *sk, struct sk_buff *skb) | |
184 | { | |
185 | if (skb->protocol == htons(ETH_P_IPV6)) { | |
186 | return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32, | |
187 | skb->nh.ipv6h->saddr.s6_addr32, | |
188 | skb->h.th->dest, | |
189 | skb->h.th->source); | |
190 | } else { | |
191 | return secure_tcp_sequence_number(skb->nh.iph->daddr, | |
192 | skb->nh.iph->saddr, | |
193 | skb->h.th->dest, | |
194 | skb->h.th->source); | |
195 | } | |
196 | } | |
197 | ||
505cbfc5 | 198 | static int __tcp_v6_check_established(struct sock *sk, const __u16 lport, |
8feaf0c0 | 199 | struct inet_timewait_sock **twp) |
1da177e4 LT |
200 | { |
201 | struct inet_sock *inet = inet_sk(sk); | |
505cbfc5 ACM |
202 | const struct ipv6_pinfo *np = inet6_sk(sk); |
203 | const struct in6_addr *daddr = &np->rcv_saddr; | |
204 | const struct in6_addr *saddr = &np->daddr; | |
205 | const int dif = sk->sk_bound_dev_if; | |
8feaf0c0 | 206 | const u32 ports = INET_COMBINED_PORTS(inet->dport, lport); |
81c3d547 ED |
207 | unsigned int hash = inet6_ehashfn(daddr, inet->num, saddr, inet->dport); |
208 | struct inet_ehash_bucket *head = inet_ehash_bucket(&tcp_hashinfo, hash); | |
1da177e4 | 209 | struct sock *sk2; |
8feaf0c0 ACM |
210 | const struct hlist_node *node; |
211 | struct inet_timewait_sock *tw; | |
1da177e4 | 212 | |
81c3d547 | 213 | prefetch(head->chain.first); |
1da177e4 LT |
214 | write_lock(&head->lock); |
215 | ||
216 | /* Check TIME-WAIT sockets first. */ | |
6e04e021 | 217 | sk_for_each(sk2, node, &(head + tcp_hashinfo.ehash_size)->chain) { |
8feaf0c0 ACM |
218 | const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk2); |
219 | ||
220 | tw = inet_twsk(sk2); | |
1da177e4 LT |
221 | |
222 | if(*((__u32 *)&(tw->tw_dport)) == ports && | |
223 | sk2->sk_family == PF_INET6 && | |
8feaf0c0 ACM |
224 | ipv6_addr_equal(&tcp6tw->tw_v6_daddr, saddr) && |
225 | ipv6_addr_equal(&tcp6tw->tw_v6_rcv_saddr, daddr) && | |
1da177e4 | 226 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) { |
8feaf0c0 | 227 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sk2); |
1da177e4 LT |
228 | struct tcp_sock *tp = tcp_sk(sk); |
229 | ||
8feaf0c0 ACM |
230 | if (tcptw->tw_ts_recent_stamp && |
231 | (!twp || | |
232 | (sysctl_tcp_tw_reuse && | |
233 | xtime.tv_sec - tcptw->tw_ts_recent_stamp > 1))) { | |
1da177e4 | 234 | /* See comment in tcp_ipv4.c */ |
8feaf0c0 | 235 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; |
1da177e4 LT |
236 | if (!tp->write_seq) |
237 | tp->write_seq = 1; | |
8feaf0c0 ACM |
238 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; |
239 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; | |
1da177e4 LT |
240 | sock_hold(sk2); |
241 | goto unique; | |
242 | } else | |
243 | goto not_unique; | |
244 | } | |
245 | } | |
246 | tw = NULL; | |
247 | ||
248 | /* And established part... */ | |
249 | sk_for_each(sk2, node, &head->chain) { | |
81c3d547 | 250 | if (INET6_MATCH(sk2, hash, saddr, daddr, ports, dif)) |
1da177e4 LT |
251 | goto not_unique; |
252 | } | |
253 | ||
254 | unique: | |
255 | BUG_TRAP(sk_unhashed(sk)); | |
256 | __sk_add_node(sk, &head->chain); | |
81c3d547 | 257 | sk->sk_hash = hash; |
1da177e4 LT |
258 | sock_prot_inc_use(sk->sk_prot); |
259 | write_unlock(&head->lock); | |
260 | ||
261 | if (twp) { | |
262 | *twp = tw; | |
263 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); | |
264 | } else if (tw) { | |
265 | /* Silly. Should hash-dance instead... */ | |
295ff7ed | 266 | inet_twsk_deschedule(tw, &tcp_death_row); |
1da177e4 LT |
267 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); |
268 | ||
8feaf0c0 | 269 | inet_twsk_put(tw); |
1da177e4 LT |
270 | } |
271 | return 0; | |
272 | ||
273 | not_unique: | |
274 | write_unlock(&head->lock); | |
275 | return -EADDRNOTAVAIL; | |
276 | } | |
277 | ||
278 | static inline u32 tcpv6_port_offset(const struct sock *sk) | |
279 | { | |
280 | const struct inet_sock *inet = inet_sk(sk); | |
281 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
282 | ||
283 | return secure_tcpv6_port_ephemeral(np->rcv_saddr.s6_addr32, | |
284 | np->daddr.s6_addr32, | |
285 | inet->dport); | |
286 | } | |
287 | ||
288 | static int tcp_v6_hash_connect(struct sock *sk) | |
289 | { | |
290 | unsigned short snum = inet_sk(sk)->num; | |
0f7ff927 ACM |
291 | struct inet_bind_hashbucket *head; |
292 | struct inet_bind_bucket *tb; | |
1da177e4 LT |
293 | int ret; |
294 | ||
295 | if (!snum) { | |
296 | int low = sysctl_local_port_range[0]; | |
297 | int high = sysctl_local_port_range[1]; | |
298 | int range = high - low; | |
299 | int i; | |
300 | int port; | |
301 | static u32 hint; | |
302 | u32 offset = hint + tcpv6_port_offset(sk); | |
303 | struct hlist_node *node; | |
8feaf0c0 | 304 | struct inet_timewait_sock *tw = NULL; |
1da177e4 LT |
305 | |
306 | local_bh_disable(); | |
307 | for (i = 1; i <= range; i++) { | |
308 | port = low + (i + offset) % range; | |
6e04e021 | 309 | head = &tcp_hashinfo.bhash[inet_bhashfn(port, tcp_hashinfo.bhash_size)]; |
1da177e4 LT |
310 | spin_lock(&head->lock); |
311 | ||
312 | /* Does not bother with rcv_saddr checks, | |
313 | * because the established check is already | |
314 | * unique enough. | |
315 | */ | |
0f7ff927 | 316 | inet_bind_bucket_for_each(tb, node, &head->chain) { |
1da177e4 LT |
317 | if (tb->port == port) { |
318 | BUG_TRAP(!hlist_empty(&tb->owners)); | |
319 | if (tb->fastreuse >= 0) | |
320 | goto next_port; | |
321 | if (!__tcp_v6_check_established(sk, | |
322 | port, | |
323 | &tw)) | |
324 | goto ok; | |
325 | goto next_port; | |
326 | } | |
327 | } | |
328 | ||
6e04e021 | 329 | tb = inet_bind_bucket_create(tcp_hashinfo.bind_bucket_cachep, head, port); |
1da177e4 LT |
330 | if (!tb) { |
331 | spin_unlock(&head->lock); | |
332 | break; | |
333 | } | |
334 | tb->fastreuse = -1; | |
335 | goto ok; | |
336 | ||
337 | next_port: | |
338 | spin_unlock(&head->lock); | |
339 | } | |
340 | local_bh_enable(); | |
341 | ||
342 | return -EADDRNOTAVAIL; | |
343 | ||
344 | ok: | |
345 | hint += i; | |
346 | ||
347 | /* Head lock still held and bh's disabled */ | |
2d8c4ce5 | 348 | inet_bind_hash(sk, tb, port); |
1da177e4 LT |
349 | if (sk_unhashed(sk)) { |
350 | inet_sk(sk)->sport = htons(port); | |
90b19d31 | 351 | __inet6_hash(&tcp_hashinfo, sk); |
1da177e4 LT |
352 | } |
353 | spin_unlock(&head->lock); | |
354 | ||
355 | if (tw) { | |
295ff7ed | 356 | inet_twsk_deschedule(tw, &tcp_death_row); |
8feaf0c0 | 357 | inet_twsk_put(tw); |
1da177e4 LT |
358 | } |
359 | ||
360 | ret = 0; | |
361 | goto out; | |
362 | } | |
363 | ||
6e04e021 | 364 | head = &tcp_hashinfo.bhash[inet_bhashfn(snum, tcp_hashinfo.bhash_size)]; |
463c84b9 | 365 | tb = inet_csk(sk)->icsk_bind_hash; |
1da177e4 LT |
366 | spin_lock_bh(&head->lock); |
367 | ||
368 | if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) { | |
90b19d31 | 369 | __inet6_hash(&tcp_hashinfo, sk); |
1da177e4 LT |
370 | spin_unlock_bh(&head->lock); |
371 | return 0; | |
372 | } else { | |
373 | spin_unlock(&head->lock); | |
374 | /* No definite answer... Walk to established hash table */ | |
375 | ret = __tcp_v6_check_established(sk, snum, NULL); | |
376 | out: | |
377 | local_bh_enable(); | |
378 | return ret; | |
379 | } | |
380 | } | |
381 | ||
1da177e4 LT |
382 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
383 | int addr_len) | |
384 | { | |
385 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
386 | struct inet_sock *inet = inet_sk(sk); | |
387 | struct ipv6_pinfo *np = inet6_sk(sk); | |
388 | struct tcp_sock *tp = tcp_sk(sk); | |
389 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
390 | struct flowi fl; | |
391 | struct dst_entry *dst; | |
392 | int addr_type; | |
393 | int err; | |
394 | ||
395 | if (addr_len < SIN6_LEN_RFC2133) | |
396 | return -EINVAL; | |
397 | ||
398 | if (usin->sin6_family != AF_INET6) | |
399 | return(-EAFNOSUPPORT); | |
400 | ||
401 | memset(&fl, 0, sizeof(fl)); | |
402 | ||
403 | if (np->sndflow) { | |
404 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
405 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
406 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
407 | struct ip6_flowlabel *flowlabel; | |
408 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
409 | if (flowlabel == NULL) | |
410 | return -EINVAL; | |
411 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
412 | fl6_sock_release(flowlabel); | |
413 | } | |
414 | } | |
415 | ||
416 | /* | |
417 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
418 | */ | |
419 | ||
420 | if(ipv6_addr_any(&usin->sin6_addr)) | |
421 | usin->sin6_addr.s6_addr[15] = 0x1; | |
422 | ||
423 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
424 | ||
425 | if(addr_type & IPV6_ADDR_MULTICAST) | |
426 | return -ENETUNREACH; | |
427 | ||
428 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
429 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
430 | usin->sin6_scope_id) { | |
431 | /* If interface is set while binding, indices | |
432 | * must coincide. | |
433 | */ | |
434 | if (sk->sk_bound_dev_if && | |
435 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
436 | return -EINVAL; | |
437 | ||
438 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
439 | } | |
440 | ||
441 | /* Connect to link-local address requires an interface */ | |
442 | if (!sk->sk_bound_dev_if) | |
443 | return -EINVAL; | |
444 | } | |
445 | ||
446 | if (tp->rx_opt.ts_recent_stamp && | |
447 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
448 | tp->rx_opt.ts_recent = 0; | |
449 | tp->rx_opt.ts_recent_stamp = 0; | |
450 | tp->write_seq = 0; | |
451 | } | |
452 | ||
453 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
454 | np->flow_label = fl.fl6_flowlabel; | |
455 | ||
456 | /* | |
457 | * TCP over IPv4 | |
458 | */ | |
459 | ||
460 | if (addr_type == IPV6_ADDR_MAPPED) { | |
461 | u32 exthdrlen = tp->ext_header_len; | |
462 | struct sockaddr_in sin; | |
463 | ||
464 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
465 | ||
466 | if (__ipv6_only_sock(sk)) | |
467 | return -ENETUNREACH; | |
468 | ||
469 | sin.sin_family = AF_INET; | |
470 | sin.sin_port = usin->sin6_port; | |
471 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
472 | ||
473 | tp->af_specific = &ipv6_mapped; | |
474 | sk->sk_backlog_rcv = tcp_v4_do_rcv; | |
475 | ||
476 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
477 | ||
478 | if (err) { | |
479 | tp->ext_header_len = exthdrlen; | |
480 | tp->af_specific = &ipv6_specific; | |
481 | sk->sk_backlog_rcv = tcp_v6_do_rcv; | |
482 | goto failure; | |
483 | } else { | |
484 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
485 | inet->saddr); | |
486 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
487 | inet->rcv_saddr); | |
488 | } | |
489 | ||
490 | return err; | |
491 | } | |
492 | ||
493 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
494 | saddr = &np->rcv_saddr; | |
495 | ||
496 | fl.proto = IPPROTO_TCP; | |
497 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
498 | ipv6_addr_copy(&fl.fl6_src, | |
499 | (saddr ? saddr : &np->saddr)); | |
500 | fl.oif = sk->sk_bound_dev_if; | |
501 | fl.fl_ip_dport = usin->sin6_port; | |
502 | fl.fl_ip_sport = inet->sport; | |
503 | ||
504 | if (np->opt && np->opt->srcrt) { | |
505 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
506 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
507 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
508 | final_p = &final; | |
509 | } | |
510 | ||
511 | err = ip6_dst_lookup(sk, &dst, &fl); | |
512 | if (err) | |
513 | goto failure; | |
514 | if (final_p) | |
515 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
516 | ||
e104411b | 517 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
1da177e4 | 518 | goto failure; |
1da177e4 LT |
519 | |
520 | if (saddr == NULL) { | |
521 | saddr = &fl.fl6_src; | |
522 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
523 | } | |
524 | ||
525 | /* set the source address */ | |
526 | ipv6_addr_copy(&np->saddr, saddr); | |
527 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
528 | ||
529 | ip6_dst_store(sk, dst, NULL); | |
530 | sk->sk_route_caps = dst->dev->features & | |
531 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
532 | ||
533 | tp->ext_header_len = 0; | |
534 | if (np->opt) | |
535 | tp->ext_header_len = np->opt->opt_flen + np->opt->opt_nflen; | |
536 | ||
537 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
538 | ||
539 | inet->dport = usin->sin6_port; | |
540 | ||
541 | tcp_set_state(sk, TCP_SYN_SENT); | |
542 | err = tcp_v6_hash_connect(sk); | |
543 | if (err) | |
544 | goto late_failure; | |
545 | ||
546 | if (!tp->write_seq) | |
547 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
548 | np->daddr.s6_addr32, | |
549 | inet->sport, | |
550 | inet->dport); | |
551 | ||
552 | err = tcp_connect(sk); | |
553 | if (err) | |
554 | goto late_failure; | |
555 | ||
556 | return 0; | |
557 | ||
558 | late_failure: | |
559 | tcp_set_state(sk, TCP_CLOSE); | |
560 | __sk_dst_reset(sk); | |
561 | failure: | |
562 | inet->dport = 0; | |
563 | sk->sk_route_caps = 0; | |
564 | return err; | |
565 | } | |
566 | ||
567 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
568 | int type, int code, int offset, __u32 info) | |
569 | { | |
570 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
505cbfc5 | 571 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
572 | struct ipv6_pinfo *np; |
573 | struct sock *sk; | |
574 | int err; | |
575 | struct tcp_sock *tp; | |
576 | __u32 seq; | |
577 | ||
505cbfc5 ACM |
578 | sk = inet6_lookup(&tcp_hashinfo, &hdr->daddr, th->dest, &hdr->saddr, |
579 | th->source, skb->dev->ifindex); | |
1da177e4 LT |
580 | |
581 | if (sk == NULL) { | |
582 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
583 | return; | |
584 | } | |
585 | ||
586 | if (sk->sk_state == TCP_TIME_WAIT) { | |
8feaf0c0 | 587 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
588 | return; |
589 | } | |
590 | ||
591 | bh_lock_sock(sk); | |
592 | if (sock_owned_by_user(sk)) | |
593 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
594 | ||
595 | if (sk->sk_state == TCP_CLOSE) | |
596 | goto out; | |
597 | ||
598 | tp = tcp_sk(sk); | |
599 | seq = ntohl(th->seq); | |
600 | if (sk->sk_state != TCP_LISTEN && | |
601 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
602 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
603 | goto out; | |
604 | } | |
605 | ||
606 | np = inet6_sk(sk); | |
607 | ||
608 | if (type == ICMPV6_PKT_TOOBIG) { | |
609 | struct dst_entry *dst = NULL; | |
610 | ||
611 | if (sock_owned_by_user(sk)) | |
612 | goto out; | |
613 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
614 | goto out; | |
615 | ||
616 | /* icmp should have updated the destination cache entry */ | |
617 | dst = __sk_dst_check(sk, np->dst_cookie); | |
618 | ||
619 | if (dst == NULL) { | |
620 | struct inet_sock *inet = inet_sk(sk); | |
621 | struct flowi fl; | |
622 | ||
623 | /* BUGGG_FUTURE: Again, it is not clear how | |
624 | to handle rthdr case. Ignore this complexity | |
625 | for now. | |
626 | */ | |
627 | memset(&fl, 0, sizeof(fl)); | |
628 | fl.proto = IPPROTO_TCP; | |
629 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
630 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
631 | fl.oif = sk->sk_bound_dev_if; | |
632 | fl.fl_ip_dport = inet->dport; | |
633 | fl.fl_ip_sport = inet->sport; | |
634 | ||
635 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
636 | sk->sk_err_soft = -err; | |
637 | goto out; | |
638 | } | |
639 | ||
640 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
641 | sk->sk_err_soft = -err; | |
642 | goto out; | |
643 | } | |
644 | ||
645 | } else | |
646 | dst_hold(dst); | |
647 | ||
648 | if (tp->pmtu_cookie > dst_mtu(dst)) { | |
649 | tcp_sync_mss(sk, dst_mtu(dst)); | |
650 | tcp_simple_retransmit(sk); | |
651 | } /* else let the usual retransmit timer handle it */ | |
652 | dst_release(dst); | |
653 | goto out; | |
654 | } | |
655 | ||
656 | icmpv6_err_convert(type, code, &err); | |
657 | ||
60236fdd | 658 | /* Might be for an request_sock */ |
1da177e4 | 659 | switch (sk->sk_state) { |
60236fdd | 660 | struct request_sock *req, **prev; |
1da177e4 LT |
661 | case TCP_LISTEN: |
662 | if (sock_owned_by_user(sk)) | |
663 | goto out; | |
664 | ||
463c84b9 | 665 | req = tcp_v6_search_req(sk, &prev, th->dest, &hdr->daddr, |
505cbfc5 | 666 | &hdr->saddr, inet6_iif(skb)); |
1da177e4 LT |
667 | if (!req) |
668 | goto out; | |
669 | ||
670 | /* ICMPs are not backlogged, hence we cannot get | |
671 | * an established socket here. | |
672 | */ | |
673 | BUG_TRAP(req->sk == NULL); | |
674 | ||
2e6599cb | 675 | if (seq != tcp_rsk(req)->snt_isn) { |
1da177e4 LT |
676 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
677 | goto out; | |
678 | } | |
679 | ||
463c84b9 | 680 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
681 | goto out; |
682 | ||
683 | case TCP_SYN_SENT: | |
684 | case TCP_SYN_RECV: /* Cannot happen. | |
685 | It can, it SYNs are crossed. --ANK */ | |
686 | if (!sock_owned_by_user(sk)) { | |
687 | TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS); | |
688 | sk->sk_err = err; | |
689 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
690 | ||
691 | tcp_done(sk); | |
692 | } else | |
693 | sk->sk_err_soft = err; | |
694 | goto out; | |
695 | } | |
696 | ||
697 | if (!sock_owned_by_user(sk) && np->recverr) { | |
698 | sk->sk_err = err; | |
699 | sk->sk_error_report(sk); | |
700 | } else | |
701 | sk->sk_err_soft = err; | |
702 | ||
703 | out: | |
704 | bh_unlock_sock(sk); | |
705 | sock_put(sk); | |
706 | } | |
707 | ||
708 | ||
60236fdd | 709 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, |
1da177e4 LT |
710 | struct dst_entry *dst) |
711 | { | |
2e6599cb | 712 | struct tcp6_request_sock *treq = tcp6_rsk(req); |
1da177e4 LT |
713 | struct ipv6_pinfo *np = inet6_sk(sk); |
714 | struct sk_buff * skb; | |
715 | struct ipv6_txoptions *opt = NULL; | |
716 | struct in6_addr * final_p = NULL, final; | |
717 | struct flowi fl; | |
718 | int err = -1; | |
719 | ||
720 | memset(&fl, 0, sizeof(fl)); | |
721 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
722 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
723 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 724 | fl.fl6_flowlabel = 0; |
2e6599cb ACM |
725 | fl.oif = treq->iif; |
726 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
1da177e4 LT |
727 | fl.fl_ip_sport = inet_sk(sk)->sport; |
728 | ||
729 | if (dst == NULL) { | |
730 | opt = np->opt; | |
731 | if (opt == NULL && | |
333fad53 | 732 | np->rxopt.bits.osrcrt == 2 && |
2e6599cb ACM |
733 | treq->pktopts) { |
734 | struct sk_buff *pktopts = treq->pktopts; | |
1da177e4 LT |
735 | struct inet6_skb_parm *rxopt = IP6CB(pktopts); |
736 | if (rxopt->srcrt) | |
737 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr*)(pktopts->nh.raw + rxopt->srcrt)); | |
738 | } | |
739 | ||
740 | if (opt && opt->srcrt) { | |
741 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
742 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
743 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
744 | final_p = &final; | |
745 | } | |
746 | ||
747 | err = ip6_dst_lookup(sk, &dst, &fl); | |
748 | if (err) | |
749 | goto done; | |
750 | if (final_p) | |
751 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
752 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
753 | goto done; | |
754 | } | |
755 | ||
756 | skb = tcp_make_synack(sk, dst, req); | |
757 | if (skb) { | |
758 | struct tcphdr *th = skb->h.th; | |
759 | ||
760 | th->check = tcp_v6_check(th, skb->len, | |
2e6599cb | 761 | &treq->loc_addr, &treq->rmt_addr, |
1da177e4 LT |
762 | csum_partial((char *)th, skb->len, skb->csum)); |
763 | ||
2e6599cb | 764 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
765 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
766 | if (err == NET_XMIT_CN) | |
767 | err = 0; | |
768 | } | |
769 | ||
770 | done: | |
1da177e4 LT |
771 | if (opt && opt != np->opt) |
772 | sock_kfree_s(sk, opt, opt->tot_len); | |
773 | return err; | |
774 | } | |
775 | ||
60236fdd | 776 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 777 | { |
2e6599cb ACM |
778 | if (tcp6_rsk(req)->pktopts) |
779 | kfree_skb(tcp6_rsk(req)->pktopts); | |
1da177e4 LT |
780 | } |
781 | ||
60236fdd | 782 | static struct request_sock_ops tcp6_request_sock_ops = { |
1da177e4 | 783 | .family = AF_INET6, |
2e6599cb | 784 | .obj_size = sizeof(struct tcp6_request_sock), |
1da177e4 | 785 | .rtx_syn_ack = tcp_v6_send_synack, |
60236fdd ACM |
786 | .send_ack = tcp_v6_reqsk_send_ack, |
787 | .destructor = tcp_v6_reqsk_destructor, | |
1da177e4 LT |
788 | .send_reset = tcp_v6_send_reset |
789 | }; | |
790 | ||
791 | static int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) | |
792 | { | |
793 | struct ipv6_pinfo *np = inet6_sk(sk); | |
794 | struct inet6_skb_parm *opt = IP6CB(skb); | |
795 | ||
796 | if (np->rxopt.all) { | |
333fad53 YH |
797 | if ((opt->hop && (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || |
798 | ((IPV6_FLOWINFO_MASK & *(u32*)skb->nh.raw) && np->rxopt.bits.rxflow) || | |
799 | (opt->srcrt && (np->rxopt.bits.srcrt || np->rxopt.bits.osrcrt)) || | |
800 | ((opt->dst1 || opt->dst0) && (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) | |
1da177e4 LT |
801 | return 1; |
802 | } | |
803 | return 0; | |
804 | } | |
805 | ||
806 | ||
807 | static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len, | |
808 | struct sk_buff *skb) | |
809 | { | |
810 | struct ipv6_pinfo *np = inet6_sk(sk); | |
811 | ||
812 | if (skb->ip_summed == CHECKSUM_HW) { | |
813 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); | |
814 | skb->csum = offsetof(struct tcphdr, check); | |
815 | } else { | |
816 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, | |
817 | csum_partial((char *)th, th->doff<<2, | |
818 | skb->csum)); | |
819 | } | |
820 | } | |
821 | ||
822 | ||
823 | static void tcp_v6_send_reset(struct sk_buff *skb) | |
824 | { | |
825 | struct tcphdr *th = skb->h.th, *t1; | |
826 | struct sk_buff *buff; | |
827 | struct flowi fl; | |
828 | ||
829 | if (th->rst) | |
830 | return; | |
831 | ||
832 | if (!ipv6_unicast_destination(skb)) | |
833 | return; | |
834 | ||
835 | /* | |
836 | * We need to grab some memory, and put together an RST, | |
837 | * and then put it into the queue to be sent. | |
838 | */ | |
839 | ||
840 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr), | |
841 | GFP_ATOMIC); | |
842 | if (buff == NULL) | |
843 | return; | |
844 | ||
845 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr)); | |
846 | ||
847 | t1 = (struct tcphdr *) skb_push(buff,sizeof(struct tcphdr)); | |
848 | ||
849 | /* Swap the send and the receive. */ | |
850 | memset(t1, 0, sizeof(*t1)); | |
851 | t1->dest = th->source; | |
852 | t1->source = th->dest; | |
853 | t1->doff = sizeof(*t1)/4; | |
854 | t1->rst = 1; | |
855 | ||
856 | if(th->ack) { | |
857 | t1->seq = th->ack_seq; | |
858 | } else { | |
859 | t1->ack = 1; | |
860 | t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin | |
861 | + skb->len - (th->doff<<2)); | |
862 | } | |
863 | ||
864 | buff->csum = csum_partial((char *)t1, sizeof(*t1), 0); | |
865 | ||
866 | memset(&fl, 0, sizeof(fl)); | |
867 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); | |
868 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); | |
869 | ||
870 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
871 | sizeof(*t1), IPPROTO_TCP, | |
872 | buff->csum); | |
873 | ||
874 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 875 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
876 | fl.fl_ip_dport = t1->dest; |
877 | fl.fl_ip_sport = t1->source; | |
878 | ||
879 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
880 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
881 | ||
ecc51b6d ACM |
882 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
883 | ip6_xmit(NULL, buff, &fl, NULL, 0); | |
884 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
885 | TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); | |
1da177e4 | 886 | return; |
ecc51b6d | 887 | } |
1da177e4 LT |
888 | } |
889 | ||
890 | kfree_skb(buff); | |
891 | } | |
892 | ||
893 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts) | |
894 | { | |
895 | struct tcphdr *th = skb->h.th, *t1; | |
896 | struct sk_buff *buff; | |
897 | struct flowi fl; | |
898 | int tot_len = sizeof(struct tcphdr); | |
899 | ||
900 | if (ts) | |
901 | tot_len += 3*4; | |
902 | ||
903 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, | |
904 | GFP_ATOMIC); | |
905 | if (buff == NULL) | |
906 | return; | |
907 | ||
908 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); | |
909 | ||
910 | t1 = (struct tcphdr *) skb_push(buff,tot_len); | |
911 | ||
912 | /* Swap the send and the receive. */ | |
913 | memset(t1, 0, sizeof(*t1)); | |
914 | t1->dest = th->source; | |
915 | t1->source = th->dest; | |
916 | t1->doff = tot_len/4; | |
917 | t1->seq = htonl(seq); | |
918 | t1->ack_seq = htonl(ack); | |
919 | t1->ack = 1; | |
920 | t1->window = htons(win); | |
921 | ||
922 | if (ts) { | |
923 | u32 *ptr = (u32*)(t1 + 1); | |
924 | *ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
925 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
926 | *ptr++ = htonl(tcp_time_stamp); | |
927 | *ptr = htonl(ts); | |
928 | } | |
929 | ||
930 | buff->csum = csum_partial((char *)t1, tot_len, 0); | |
931 | ||
932 | memset(&fl, 0, sizeof(fl)); | |
933 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); | |
934 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); | |
935 | ||
936 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
937 | tot_len, IPPROTO_TCP, | |
938 | buff->csum); | |
939 | ||
940 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 941 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
942 | fl.fl_ip_dport = t1->dest; |
943 | fl.fl_ip_sport = t1->source; | |
944 | ||
945 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
ecc51b6d ACM |
946 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
947 | ip6_xmit(NULL, buff, &fl, NULL, 0); | |
948 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
1da177e4 | 949 | return; |
ecc51b6d | 950 | } |
1da177e4 LT |
951 | } |
952 | ||
953 | kfree_skb(buff); | |
954 | } | |
955 | ||
956 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
957 | { | |
8feaf0c0 ACM |
958 | struct inet_timewait_sock *tw = inet_twsk(sk); |
959 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sk); | |
1da177e4 | 960 | |
8feaf0c0 ACM |
961 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
962 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, | |
963 | tcptw->tw_ts_recent); | |
1da177e4 | 964 | |
8feaf0c0 | 965 | inet_twsk_put(tw); |
1da177e4 LT |
966 | } |
967 | ||
60236fdd | 968 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req) |
1da177e4 | 969 | { |
2e6599cb | 970 | 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 |
971 | } |
972 | ||
973 | ||
974 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
975 | { | |
60236fdd | 976 | struct request_sock *req, **prev; |
505cbfc5 | 977 | const struct tcphdr *th = skb->h.th; |
1da177e4 LT |
978 | struct sock *nsk; |
979 | ||
980 | /* Find possible connection requests. */ | |
463c84b9 | 981 | req = tcp_v6_search_req(sk, &prev, th->source, &skb->nh.ipv6h->saddr, |
505cbfc5 | 982 | &skb->nh.ipv6h->daddr, inet6_iif(skb)); |
1da177e4 LT |
983 | if (req) |
984 | return tcp_check_req(sk, skb, req, prev); | |
985 | ||
505cbfc5 ACM |
986 | nsk = __inet6_lookup_established(&tcp_hashinfo, &skb->nh.ipv6h->saddr, |
987 | th->source, &skb->nh.ipv6h->daddr, | |
988 | ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
989 | |
990 | if (nsk) { | |
991 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
992 | bh_lock_sock(nsk); | |
993 | return nsk; | |
994 | } | |
8feaf0c0 | 995 | inet_twsk_put((struct inet_timewait_sock *)nsk); |
1da177e4 LT |
996 | return NULL; |
997 | } | |
998 | ||
999 | #if 0 /*def CONFIG_SYN_COOKIES*/ | |
1000 | if (!th->rst && !th->syn && th->ack) | |
1001 | sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt)); | |
1002 | #endif | |
1003 | return sk; | |
1004 | } | |
1005 | ||
60236fdd | 1006 | static void tcp_v6_synq_add(struct sock *sk, struct request_sock *req) |
1da177e4 | 1007 | { |
463c84b9 ACM |
1008 | struct inet_connection_sock *icsk = inet_csk(sk); |
1009 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
1010 | const u32 h = tcp_v6_synq_hash(&tcp6_rsk(req)->rmt_addr, inet_rsk(req)->rmt_port, lopt->hash_rnd); | |
1da177e4 | 1011 | |
463c84b9 ACM |
1012 | reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, TCP_TIMEOUT_INIT); |
1013 | inet_csk_reqsk_queue_added(sk, TCP_TIMEOUT_INIT); | |
1da177e4 LT |
1014 | } |
1015 | ||
1016 | ||
1017 | /* FIXME: this is substantially similar to the ipv4 code. | |
1018 | * Can some kind of merge be done? -- erics | |
1019 | */ | |
1020 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1021 | { | |
2e6599cb | 1022 | struct tcp6_request_sock *treq; |
1da177e4 LT |
1023 | struct ipv6_pinfo *np = inet6_sk(sk); |
1024 | struct tcp_options_received tmp_opt; | |
1025 | struct tcp_sock *tp = tcp_sk(sk); | |
60236fdd | 1026 | struct request_sock *req = NULL; |
1da177e4 LT |
1027 | __u32 isn = TCP_SKB_CB(skb)->when; |
1028 | ||
1029 | if (skb->protocol == htons(ETH_P_IP)) | |
1030 | return tcp_v4_conn_request(sk, skb); | |
1031 | ||
1032 | if (!ipv6_unicast_destination(skb)) | |
1033 | goto drop; | |
1034 | ||
1035 | /* | |
1036 | * There are no SYN attacks on IPv6, yet... | |
1037 | */ | |
463c84b9 | 1038 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 LT |
1039 | if (net_ratelimit()) |
1040 | printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n"); | |
1041 | goto drop; | |
1042 | } | |
1043 | ||
463c84b9 | 1044 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1045 | goto drop; |
1046 | ||
60236fdd | 1047 | req = reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1048 | if (req == NULL) |
1049 | goto drop; | |
1050 | ||
1051 | tcp_clear_options(&tmp_opt); | |
1052 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1053 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
1054 | ||
1055 | tcp_parse_options(skb, &tmp_opt, 0); | |
1056 | ||
1057 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; | |
1058 | tcp_openreq_init(req, &tmp_opt, skb); | |
1059 | ||
2e6599cb ACM |
1060 | treq = tcp6_rsk(req); |
1061 | ipv6_addr_copy(&treq->rmt_addr, &skb->nh.ipv6h->saddr); | |
1062 | ipv6_addr_copy(&treq->loc_addr, &skb->nh.ipv6h->daddr); | |
1da177e4 | 1063 | TCP_ECN_create_request(req, skb->h.th); |
2e6599cb | 1064 | treq->pktopts = NULL; |
1da177e4 | 1065 | if (ipv6_opt_accepted(sk, skb) || |
333fad53 YH |
1066 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
1067 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1da177e4 | 1068 | atomic_inc(&skb->users); |
2e6599cb | 1069 | treq->pktopts = skb; |
1da177e4 | 1070 | } |
2e6599cb | 1071 | treq->iif = sk->sk_bound_dev_if; |
1da177e4 LT |
1072 | |
1073 | /* So that link locals have meaning */ | |
1074 | if (!sk->sk_bound_dev_if && | |
2e6599cb | 1075 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) |
505cbfc5 | 1076 | treq->iif = inet6_iif(skb); |
1da177e4 LT |
1077 | |
1078 | if (isn == 0) | |
1079 | isn = tcp_v6_init_sequence(sk,skb); | |
1080 | ||
2e6599cb | 1081 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 LT |
1082 | |
1083 | if (tcp_v6_send_synack(sk, req, NULL)) | |
1084 | goto drop; | |
1085 | ||
1086 | tcp_v6_synq_add(sk, req); | |
1087 | ||
1088 | return 0; | |
1089 | ||
1090 | drop: | |
1091 | if (req) | |
60236fdd | 1092 | reqsk_free(req); |
1da177e4 LT |
1093 | |
1094 | TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS); | |
1095 | return 0; /* don't send reset */ | |
1096 | } | |
1097 | ||
1098 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1099 | struct request_sock *req, |
1da177e4 LT |
1100 | struct dst_entry *dst) |
1101 | { | |
2e6599cb | 1102 | struct tcp6_request_sock *treq = tcp6_rsk(req); |
1da177e4 LT |
1103 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1104 | struct tcp6_sock *newtcp6sk; | |
1105 | struct inet_sock *newinet; | |
1106 | struct tcp_sock *newtp; | |
1107 | struct sock *newsk; | |
1108 | struct ipv6_txoptions *opt; | |
1109 | ||
1110 | if (skb->protocol == htons(ETH_P_IP)) { | |
1111 | /* | |
1112 | * v6 mapped | |
1113 | */ | |
1114 | ||
1115 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1116 | ||
1117 | if (newsk == NULL) | |
1118 | return NULL; | |
1119 | ||
1120 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1121 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1122 | ||
1123 | newinet = inet_sk(newsk); | |
1124 | newnp = inet6_sk(newsk); | |
1125 | newtp = tcp_sk(newsk); | |
1126 | ||
1127 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1128 | ||
1129 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
1130 | newinet->daddr); | |
1131 | ||
1132 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
1133 | newinet->saddr); | |
1134 | ||
1135 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1136 | ||
1137 | newtp->af_specific = &ipv6_mapped; | |
1138 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; | |
1139 | newnp->pktoptions = NULL; | |
1140 | newnp->opt = NULL; | |
505cbfc5 | 1141 | newnp->mcast_oif = inet6_iif(skb); |
1da177e4 LT |
1142 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; |
1143 | ||
e6848976 ACM |
1144 | /* |
1145 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1146 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1147 | * that function for the gory details. -acme | |
1da177e4 | 1148 | */ |
1da177e4 LT |
1149 | |
1150 | /* It is tricky place. Until this moment IPv4 tcp | |
1151 | worked with IPv6 af_tcp.af_specific. | |
1152 | Sync it now. | |
1153 | */ | |
1154 | tcp_sync_mss(newsk, newtp->pmtu_cookie); | |
1155 | ||
1156 | return newsk; | |
1157 | } | |
1158 | ||
1159 | opt = np->opt; | |
1160 | ||
1161 | if (sk_acceptq_is_full(sk)) | |
1162 | goto out_overflow; | |
1163 | ||
333fad53 | 1164 | if (np->rxopt.bits.osrcrt == 2 && |
2e6599cb ACM |
1165 | opt == NULL && treq->pktopts) { |
1166 | struct inet6_skb_parm *rxopt = IP6CB(treq->pktopts); | |
1da177e4 | 1167 | if (rxopt->srcrt) |
2e6599cb | 1168 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr *)(treq->pktopts->nh.raw + rxopt->srcrt)); |
1da177e4 LT |
1169 | } |
1170 | ||
1171 | if (dst == NULL) { | |
1172 | struct in6_addr *final_p = NULL, final; | |
1173 | struct flowi fl; | |
1174 | ||
1175 | memset(&fl, 0, sizeof(fl)); | |
1176 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1177 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
1178 | if (opt && opt->srcrt) { |
1179 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1180 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1181 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1182 | final_p = &final; | |
1183 | } | |
2e6599cb | 1184 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1185 | fl.oif = sk->sk_bound_dev_if; |
2e6599cb | 1186 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
1da177e4 LT |
1187 | fl.fl_ip_sport = inet_sk(sk)->sport; |
1188 | ||
1189 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1190 | goto out; | |
1191 | ||
1192 | if (final_p) | |
1193 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1194 | ||
1195 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
1196 | goto out; | |
1197 | } | |
1198 | ||
1199 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1200 | if (newsk == NULL) | |
1201 | goto out; | |
1202 | ||
e6848976 ACM |
1203 | /* |
1204 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1205 | * count here, tcp_create_openreq_child now does this for us, see the | |
1206 | * comment in that function for the gory details. -acme | |
1207 | */ | |
1da177e4 LT |
1208 | |
1209 | ip6_dst_store(newsk, dst, NULL); | |
1210 | newsk->sk_route_caps = dst->dev->features & | |
1211 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1212 | ||
1213 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1214 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1215 | ||
1216 | newtp = tcp_sk(newsk); | |
1217 | newinet = inet_sk(newsk); | |
1218 | newnp = inet6_sk(newsk); | |
1219 | ||
1220 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1221 | ||
2e6599cb ACM |
1222 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1223 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1224 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1225 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 LT |
1226 | |
1227 | /* Now IPv6 options... | |
1228 | ||
1229 | First: no IPv4 options. | |
1230 | */ | |
1231 | newinet->opt = NULL; | |
1232 | ||
1233 | /* Clone RX bits */ | |
1234 | newnp->rxopt.all = np->rxopt.all; | |
1235 | ||
1236 | /* Clone pktoptions received with SYN */ | |
1237 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1238 | if (treq->pktopts != NULL) { |
1239 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1240 | kfree_skb(treq->pktopts); | |
1241 | treq->pktopts = NULL; | |
1da177e4 LT |
1242 | if (newnp->pktoptions) |
1243 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1244 | } | |
1245 | newnp->opt = NULL; | |
505cbfc5 | 1246 | newnp->mcast_oif = inet6_iif(skb); |
1da177e4 LT |
1247 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; |
1248 | ||
1249 | /* Clone native IPv6 options from listening socket (if any) | |
1250 | ||
1251 | Yes, keeping reference count would be much more clever, | |
1252 | but we make one more one thing there: reattach optmem | |
1253 | to newsk. | |
1254 | */ | |
1255 | if (opt) { | |
1256 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1257 | if (opt != np->opt) | |
1258 | sock_kfree_s(sk, opt, opt->tot_len); | |
1259 | } | |
1260 | ||
1261 | newtp->ext_header_len = 0; | |
1262 | if (newnp->opt) | |
1263 | newtp->ext_header_len = newnp->opt->opt_nflen + | |
1264 | newnp->opt->opt_flen; | |
1265 | ||
1266 | tcp_sync_mss(newsk, dst_mtu(dst)); | |
1267 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1268 | tcp_initialize_rcv_mss(newsk); | |
1269 | ||
1270 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
1271 | ||
90b19d31 | 1272 | __inet6_hash(&tcp_hashinfo, newsk); |
2d8c4ce5 | 1273 | inet_inherit_port(&tcp_hashinfo, sk, newsk); |
1da177e4 LT |
1274 | |
1275 | return newsk; | |
1276 | ||
1277 | out_overflow: | |
1278 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
1279 | out: | |
1280 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
1281 | if (opt && opt != np->opt) | |
1282 | sock_kfree_s(sk, opt, opt->tot_len); | |
1283 | dst_release(dst); | |
1284 | return NULL; | |
1285 | } | |
1286 | ||
1287 | static int tcp_v6_checksum_init(struct sk_buff *skb) | |
1288 | { | |
1289 | if (skb->ip_summed == CHECKSUM_HW) { | |
1da177e4 | 1290 | if (!tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, |
fb286bb2 HX |
1291 | &skb->nh.ipv6h->daddr,skb->csum)) { |
1292 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1da177e4 | 1293 | return 0; |
fb286bb2 | 1294 | } |
1da177e4 | 1295 | } |
fb286bb2 HX |
1296 | |
1297 | skb->csum = ~tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, | |
1298 | &skb->nh.ipv6h->daddr, 0); | |
1299 | ||
1da177e4 | 1300 | if (skb->len <= 76) { |
fb286bb2 | 1301 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1302 | } |
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | /* The socket must have it's spinlock held when we get | |
1307 | * here. | |
1308 | * | |
1309 | * We have a potential double-lock case here, so even when | |
1310 | * doing backlog processing we use the BH locking scheme. | |
1311 | * This is because we cannot sleep with the original spinlock | |
1312 | * held. | |
1313 | */ | |
1314 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1315 | { | |
1316 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1317 | struct tcp_sock *tp; | |
1318 | struct sk_buff *opt_skb = NULL; | |
1319 | ||
1320 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1321 | goes to IPv4 receive handler and backlogged. | |
1322 | From backlog it always goes here. Kerboom... | |
1323 | Fortunately, tcp_rcv_established and rcv_established | |
1324 | handle them correctly, but it is not case with | |
1325 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1326 | */ | |
1327 | ||
1328 | if (skb->protocol == htons(ETH_P_IP)) | |
1329 | return tcp_v4_do_rcv(sk, skb); | |
1330 | ||
1331 | if (sk_filter(sk, skb, 0)) | |
1332 | goto discard; | |
1333 | ||
1334 | /* | |
1335 | * socket locking is here for SMP purposes as backlog rcv | |
1336 | * is currently called with bh processing disabled. | |
1337 | */ | |
1338 | ||
1339 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1340 | ||
1341 | Yes, guys, it is the only place in our code, where we | |
1342 | may make it not affecting IPv4. | |
1343 | The rest of code is protocol independent, | |
1344 | and I do not like idea to uglify IPv4. | |
1345 | ||
1346 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1347 | looks not very well thought. For now we latch | |
1348 | options, received in the last packet, enqueued | |
1349 | by tcp. Feel free to propose better solution. | |
1350 | --ANK (980728) | |
1351 | */ | |
1352 | if (np->rxopt.all) | |
1353 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1354 | ||
1355 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1356 | TCP_CHECK_TIMER(sk); | |
1357 | if (tcp_rcv_established(sk, skb, skb->h.th, skb->len)) | |
1358 | goto reset; | |
1359 | TCP_CHECK_TIMER(sk); | |
1360 | if (opt_skb) | |
1361 | goto ipv6_pktoptions; | |
1362 | return 0; | |
1363 | } | |
1364 | ||
1365 | if (skb->len < (skb->h.th->doff<<2) || tcp_checksum_complete(skb)) | |
1366 | goto csum_err; | |
1367 | ||
1368 | if (sk->sk_state == TCP_LISTEN) { | |
1369 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); | |
1370 | if (!nsk) | |
1371 | goto discard; | |
1372 | ||
1373 | /* | |
1374 | * Queue it on the new socket if the new socket is active, | |
1375 | * otherwise we just shortcircuit this and continue with | |
1376 | * the new socket.. | |
1377 | */ | |
1378 | if(nsk != sk) { | |
1379 | if (tcp_child_process(sk, nsk, skb)) | |
1380 | goto reset; | |
1381 | if (opt_skb) | |
1382 | __kfree_skb(opt_skb); | |
1383 | return 0; | |
1384 | } | |
1385 | } | |
1386 | ||
1387 | TCP_CHECK_TIMER(sk); | |
1388 | if (tcp_rcv_state_process(sk, skb, skb->h.th, skb->len)) | |
1389 | goto reset; | |
1390 | TCP_CHECK_TIMER(sk); | |
1391 | if (opt_skb) | |
1392 | goto ipv6_pktoptions; | |
1393 | return 0; | |
1394 | ||
1395 | reset: | |
1396 | tcp_v6_send_reset(skb); | |
1397 | discard: | |
1398 | if (opt_skb) | |
1399 | __kfree_skb(opt_skb); | |
1400 | kfree_skb(skb); | |
1401 | return 0; | |
1402 | csum_err: | |
1403 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1404 | goto discard; | |
1405 | ||
1406 | ||
1407 | ipv6_pktoptions: | |
1408 | /* Do you ask, what is it? | |
1409 | ||
1410 | 1. skb was enqueued by tcp. | |
1411 | 2. skb is added to tail of read queue, rather than out of order. | |
1412 | 3. socket is not in passive state. | |
1413 | 4. Finally, it really contains options, which user wants to receive. | |
1414 | */ | |
1415 | tp = tcp_sk(sk); | |
1416 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1417 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1418 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1419 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1420 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
1da177e4 LT |
1421 | np->mcast_hops = opt_skb->nh.ipv6h->hop_limit; |
1422 | if (ipv6_opt_accepted(sk, opt_skb)) { | |
1423 | skb_set_owner_r(opt_skb, sk); | |
1424 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1425 | } else { | |
1426 | __kfree_skb(opt_skb); | |
1427 | opt_skb = xchg(&np->pktoptions, NULL); | |
1428 | } | |
1429 | } | |
1430 | ||
1431 | if (opt_skb) | |
1432 | kfree_skb(opt_skb); | |
1433 | return 0; | |
1434 | } | |
1435 | ||
1436 | static int tcp_v6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) | |
1437 | { | |
1438 | struct sk_buff *skb = *pskb; | |
1439 | struct tcphdr *th; | |
1440 | struct sock *sk; | |
1441 | int ret; | |
1442 | ||
1443 | if (skb->pkt_type != PACKET_HOST) | |
1444 | goto discard_it; | |
1445 | ||
1446 | /* | |
1447 | * Count it even if it's bad. | |
1448 | */ | |
1449 | TCP_INC_STATS_BH(TCP_MIB_INSEGS); | |
1450 | ||
1451 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1452 | goto discard_it; | |
1453 | ||
1454 | th = skb->h.th; | |
1455 | ||
1456 | if (th->doff < sizeof(struct tcphdr)/4) | |
1457 | goto bad_packet; | |
1458 | if (!pskb_may_pull(skb, th->doff*4)) | |
1459 | goto discard_it; | |
1460 | ||
1461 | if ((skb->ip_summed != CHECKSUM_UNNECESSARY && | |
fb286bb2 | 1462 | tcp_v6_checksum_init(skb))) |
1da177e4 LT |
1463 | goto bad_packet; |
1464 | ||
1465 | th = skb->h.th; | |
1466 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1467 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1468 | skb->len - th->doff*4); | |
1469 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1470 | TCP_SKB_CB(skb)->when = 0; | |
1471 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(skb->nh.ipv6h); | |
1472 | TCP_SKB_CB(skb)->sacked = 0; | |
1473 | ||
505cbfc5 ACM |
1474 | sk = __inet6_lookup(&tcp_hashinfo, &skb->nh.ipv6h->saddr, th->source, |
1475 | &skb->nh.ipv6h->daddr, ntohs(th->dest), | |
1476 | inet6_iif(skb)); | |
1da177e4 LT |
1477 | |
1478 | if (!sk) | |
1479 | goto no_tcp_socket; | |
1480 | ||
1481 | process: | |
1482 | if (sk->sk_state == TCP_TIME_WAIT) | |
1483 | goto do_time_wait; | |
1484 | ||
1485 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1486 | goto discard_and_relse; | |
1487 | ||
1488 | if (sk_filter(sk, skb, 0)) | |
1489 | goto discard_and_relse; | |
1490 | ||
1491 | skb->dev = NULL; | |
1492 | ||
1493 | bh_lock_sock(sk); | |
1494 | ret = 0; | |
1495 | if (!sock_owned_by_user(sk)) { | |
1496 | if (!tcp_prequeue(sk, skb)) | |
1497 | ret = tcp_v6_do_rcv(sk, skb); | |
1498 | } else | |
1499 | sk_add_backlog(sk, skb); | |
1500 | bh_unlock_sock(sk); | |
1501 | ||
1502 | sock_put(sk); | |
1503 | return ret ? -1 : 0; | |
1504 | ||
1505 | no_tcp_socket: | |
1506 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1507 | goto discard_it; | |
1508 | ||
1509 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1510 | bad_packet: | |
1511 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1512 | } else { | |
1513 | tcp_v6_send_reset(skb); | |
1514 | } | |
1515 | ||
1516 | discard_it: | |
1517 | ||
1518 | /* | |
1519 | * Discard frame | |
1520 | */ | |
1521 | ||
1522 | kfree_skb(skb); | |
1523 | return 0; | |
1524 | ||
1525 | discard_and_relse: | |
1526 | sock_put(sk); | |
1527 | goto discard_it; | |
1528 | ||
1529 | do_time_wait: | |
1530 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
8feaf0c0 | 1531 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
1532 | goto discard_it; |
1533 | } | |
1534 | ||
1535 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1536 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
8feaf0c0 | 1537 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
1538 | goto discard_it; |
1539 | } | |
1540 | ||
8feaf0c0 ACM |
1541 | switch (tcp_timewait_state_process((struct inet_timewait_sock *)sk, |
1542 | skb, th)) { | |
1da177e4 LT |
1543 | case TCP_TW_SYN: |
1544 | { | |
1545 | struct sock *sk2; | |
1546 | ||
505cbfc5 ACM |
1547 | sk2 = inet6_lookup_listener(&tcp_hashinfo, |
1548 | &skb->nh.ipv6h->daddr, | |
1549 | ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 | 1550 | if (sk2 != NULL) { |
295ff7ed ACM |
1551 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1552 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1553 | inet_twsk_put(tw); | |
1da177e4 LT |
1554 | sk = sk2; |
1555 | goto process; | |
1556 | } | |
1557 | /* Fall through to ACK */ | |
1558 | } | |
1559 | case TCP_TW_ACK: | |
1560 | tcp_v6_timewait_ack(sk, skb); | |
1561 | break; | |
1562 | case TCP_TW_RST: | |
1563 | goto no_tcp_socket; | |
1564 | case TCP_TW_SUCCESS:; | |
1565 | } | |
1566 | goto discard_it; | |
1567 | } | |
1568 | ||
1569 | static int tcp_v6_rebuild_header(struct sock *sk) | |
1570 | { | |
1571 | int err; | |
1572 | struct dst_entry *dst; | |
1573 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1574 | ||
1575 | dst = __sk_dst_check(sk, np->dst_cookie); | |
1576 | ||
1577 | if (dst == NULL) { | |
1578 | struct inet_sock *inet = inet_sk(sk); | |
1579 | struct in6_addr *final_p = NULL, final; | |
1580 | struct flowi fl; | |
1581 | ||
1582 | memset(&fl, 0, sizeof(fl)); | |
1583 | fl.proto = IPPROTO_TCP; | |
1584 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
1585 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
1586 | fl.fl6_flowlabel = np->flow_label; | |
1587 | fl.oif = sk->sk_bound_dev_if; | |
1588 | fl.fl_ip_dport = inet->dport; | |
1589 | fl.fl_ip_sport = inet->sport; | |
1590 | ||
1591 | if (np->opt && np->opt->srcrt) { | |
1592 | struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; | |
1593 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1594 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1595 | final_p = &final; | |
1596 | } | |
1597 | ||
1598 | err = ip6_dst_lookup(sk, &dst, &fl); | |
1599 | if (err) { | |
1600 | sk->sk_route_caps = 0; | |
1601 | return err; | |
1602 | } | |
1603 | if (final_p) | |
1604 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1605 | ||
1606 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
1607 | sk->sk_err_soft = -err; | |
1da177e4 LT |
1608 | return err; |
1609 | } | |
1610 | ||
1611 | ip6_dst_store(sk, dst, NULL); | |
1612 | sk->sk_route_caps = dst->dev->features & | |
1613 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1614 | } | |
1615 | ||
1616 | return 0; | |
1617 | } | |
1618 | ||
1619 | static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok) | |
1620 | { | |
1621 | struct sock *sk = skb->sk; | |
1622 | struct inet_sock *inet = inet_sk(sk); | |
1623 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1624 | struct flowi fl; | |
1625 | struct dst_entry *dst; | |
1626 | struct in6_addr *final_p = NULL, final; | |
1627 | ||
1628 | memset(&fl, 0, sizeof(fl)); | |
1629 | fl.proto = IPPROTO_TCP; | |
1630 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
1631 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
1632 | fl.fl6_flowlabel = np->flow_label; | |
1633 | IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); | |
1634 | fl.oif = sk->sk_bound_dev_if; | |
1635 | fl.fl_ip_sport = inet->sport; | |
1636 | fl.fl_ip_dport = inet->dport; | |
1637 | ||
1638 | if (np->opt && np->opt->srcrt) { | |
1639 | struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; | |
1640 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1641 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1642 | final_p = &final; | |
1643 | } | |
1644 | ||
1645 | dst = __sk_dst_check(sk, np->dst_cookie); | |
1646 | ||
1647 | if (dst == NULL) { | |
1648 | int err = ip6_dst_lookup(sk, &dst, &fl); | |
1649 | ||
1650 | if (err) { | |
1651 | sk->sk_err_soft = -err; | |
1652 | return err; | |
1653 | } | |
1654 | ||
1655 | if (final_p) | |
1656 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1657 | ||
1658 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
1659 | sk->sk_route_caps = 0; | |
1da177e4 LT |
1660 | return err; |
1661 | } | |
1662 | ||
1663 | ip6_dst_store(sk, dst, NULL); | |
1664 | sk->sk_route_caps = dst->dev->features & | |
1665 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1666 | } | |
1667 | ||
1668 | skb->dst = dst_clone(dst); | |
1669 | ||
1670 | /* Restore final destination back after routing done */ | |
1671 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
1672 | ||
1673 | return ip6_xmit(sk, skb, &fl, np->opt, 0); | |
1674 | } | |
1675 | ||
1676 | static void v6_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) | |
1677 | { | |
1678 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1679 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; | |
1680 | ||
1681 | sin6->sin6_family = AF_INET6; | |
1682 | ipv6_addr_copy(&sin6->sin6_addr, &np->daddr); | |
1683 | sin6->sin6_port = inet_sk(sk)->dport; | |
1684 | /* We do not store received flowlabel for TCP */ | |
1685 | sin6->sin6_flowinfo = 0; | |
1686 | sin6->sin6_scope_id = 0; | |
1687 | if (sk->sk_bound_dev_if && | |
1688 | ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
1689 | sin6->sin6_scope_id = sk->sk_bound_dev_if; | |
1690 | } | |
1691 | ||
1692 | static int tcp_v6_remember_stamp(struct sock *sk) | |
1693 | { | |
1694 | /* Alas, not yet... */ | |
1695 | return 0; | |
1696 | } | |
1697 | ||
1698 | static struct tcp_func ipv6_specific = { | |
1699 | .queue_xmit = tcp_v6_xmit, | |
1700 | .send_check = tcp_v6_send_check, | |
1701 | .rebuild_header = tcp_v6_rebuild_header, | |
1702 | .conn_request = tcp_v6_conn_request, | |
1703 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1704 | .remember_stamp = tcp_v6_remember_stamp, | |
1705 | .net_header_len = sizeof(struct ipv6hdr), | |
1706 | ||
1707 | .setsockopt = ipv6_setsockopt, | |
1708 | .getsockopt = ipv6_getsockopt, | |
1709 | .addr2sockaddr = v6_addr2sockaddr, | |
1710 | .sockaddr_len = sizeof(struct sockaddr_in6) | |
1711 | }; | |
1712 | ||
1713 | /* | |
1714 | * TCP over IPv4 via INET6 API | |
1715 | */ | |
1716 | ||
1717 | static struct tcp_func ipv6_mapped = { | |
1718 | .queue_xmit = ip_queue_xmit, | |
1719 | .send_check = tcp_v4_send_check, | |
32519f11 | 1720 | .rebuild_header = inet_sk_rebuild_header, |
1da177e4 LT |
1721 | .conn_request = tcp_v6_conn_request, |
1722 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1723 | .remember_stamp = tcp_v4_remember_stamp, | |
1724 | .net_header_len = sizeof(struct iphdr), | |
1725 | ||
1726 | .setsockopt = ipv6_setsockopt, | |
1727 | .getsockopt = ipv6_getsockopt, | |
1728 | .addr2sockaddr = v6_addr2sockaddr, | |
1729 | .sockaddr_len = sizeof(struct sockaddr_in6) | |
1730 | }; | |
1731 | ||
1732 | ||
1733 | ||
1734 | /* NOTE: A lot of things set to zero explicitly by call to | |
1735 | * sk_alloc() so need not be done here. | |
1736 | */ | |
1737 | static int tcp_v6_init_sock(struct sock *sk) | |
1738 | { | |
6687e988 | 1739 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1740 | struct tcp_sock *tp = tcp_sk(sk); |
1741 | ||
1742 | skb_queue_head_init(&tp->out_of_order_queue); | |
1743 | tcp_init_xmit_timers(sk); | |
1744 | tcp_prequeue_init(tp); | |
1745 | ||
6687e988 | 1746 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1747 | tp->mdev = TCP_TIMEOUT_INIT; |
1748 | ||
1749 | /* So many TCP implementations out there (incorrectly) count the | |
1750 | * initial SYN frame in their delayed-ACK and congestion control | |
1751 | * algorithms that we must have the following bandaid to talk | |
1752 | * efficiently to them. -DaveM | |
1753 | */ | |
1754 | tp->snd_cwnd = 2; | |
1755 | ||
1756 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1757 | * initialization of these values. | |
1758 | */ | |
1759 | tp->snd_ssthresh = 0x7fffffff; | |
1760 | tp->snd_cwnd_clamp = ~0; | |
c1b4a7e6 | 1761 | tp->mss_cache = 536; |
1da177e4 LT |
1762 | |
1763 | tp->reordering = sysctl_tcp_reordering; | |
1764 | ||
1765 | sk->sk_state = TCP_CLOSE; | |
1766 | ||
1767 | tp->af_specific = &ipv6_specific; | |
6687e988 | 1768 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
1da177e4 LT |
1769 | sk->sk_write_space = sk_stream_write_space; |
1770 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1771 | ||
1772 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; | |
1773 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1774 | ||
1775 | atomic_inc(&tcp_sockets_allocated); | |
1776 | ||
1777 | return 0; | |
1778 | } | |
1779 | ||
1780 | static int tcp_v6_destroy_sock(struct sock *sk) | |
1781 | { | |
1da177e4 LT |
1782 | tcp_v4_destroy_sock(sk); |
1783 | return inet6_destroy_sock(sk); | |
1784 | } | |
1785 | ||
1786 | /* Proc filesystem TCPv6 sock list dumping. */ | |
1787 | static void get_openreq6(struct seq_file *seq, | |
60236fdd | 1788 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 LT |
1789 | { |
1790 | struct in6_addr *dest, *src; | |
1791 | int ttd = req->expires - jiffies; | |
1792 | ||
1793 | if (ttd < 0) | |
1794 | ttd = 0; | |
1795 | ||
2e6599cb ACM |
1796 | src = &tcp6_rsk(req)->loc_addr; |
1797 | dest = &tcp6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1798 | seq_printf(seq, |
1799 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1800 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1801 | i, | |
1802 | src->s6_addr32[0], src->s6_addr32[1], | |
1803 | src->s6_addr32[2], src->s6_addr32[3], | |
1804 | ntohs(inet_sk(sk)->sport), | |
1805 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1806 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1807 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1808 | TCP_SYN_RECV, |
1809 | 0,0, /* could print option size, but that is af dependent. */ | |
1810 | 1, /* timers active (only the expire timer) */ | |
1811 | jiffies_to_clock_t(ttd), | |
1812 | req->retrans, | |
1813 | uid, | |
1814 | 0, /* non standard timer */ | |
1815 | 0, /* open_requests have no inode */ | |
1816 | 0, req); | |
1817 | } | |
1818 | ||
1819 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1820 | { | |
1821 | struct in6_addr *dest, *src; | |
1822 | __u16 destp, srcp; | |
1823 | int timer_active; | |
1824 | unsigned long timer_expires; | |
1825 | struct inet_sock *inet = inet_sk(sp); | |
1826 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1827 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
1828 | struct ipv6_pinfo *np = inet6_sk(sp); |
1829 | ||
1830 | dest = &np->daddr; | |
1831 | src = &np->rcv_saddr; | |
1832 | destp = ntohs(inet->dport); | |
1833 | srcp = ntohs(inet->sport); | |
463c84b9 ACM |
1834 | |
1835 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1836 | timer_active = 1; |
463c84b9 ACM |
1837 | timer_expires = icsk->icsk_timeout; |
1838 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1839 | timer_active = 4; |
463c84b9 | 1840 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1841 | } else if (timer_pending(&sp->sk_timer)) { |
1842 | timer_active = 2; | |
1843 | timer_expires = sp->sk_timer.expires; | |
1844 | } else { | |
1845 | timer_active = 0; | |
1846 | timer_expires = jiffies; | |
1847 | } | |
1848 | ||
1849 | seq_printf(seq, | |
1850 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1851 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n", | |
1852 | i, | |
1853 | src->s6_addr32[0], src->s6_addr32[1], | |
1854 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1855 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1856 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1857 | sp->sk_state, | |
1858 | tp->write_seq-tp->snd_una, tp->rcv_nxt-tp->copied_seq, | |
1859 | timer_active, | |
1860 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 1861 | icsk->icsk_retransmits, |
1da177e4 | 1862 | sock_i_uid(sp), |
6687e988 | 1863 | icsk->icsk_probes_out, |
1da177e4 LT |
1864 | sock_i_ino(sp), |
1865 | atomic_read(&sp->sk_refcnt), sp, | |
463c84b9 ACM |
1866 | icsk->icsk_rto, |
1867 | icsk->icsk_ack.ato, | |
1868 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, | |
1da177e4 LT |
1869 | tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh |
1870 | ); | |
1871 | } | |
1872 | ||
1873 | static void get_timewait6_sock(struct seq_file *seq, | |
8feaf0c0 | 1874 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
1875 | { |
1876 | struct in6_addr *dest, *src; | |
1877 | __u16 destp, srcp; | |
8feaf0c0 | 1878 | struct tcp6_timewait_sock *tcp6tw = tcp6_twsk((struct sock *)tw); |
1da177e4 LT |
1879 | int ttd = tw->tw_ttd - jiffies; |
1880 | ||
1881 | if (ttd < 0) | |
1882 | ttd = 0; | |
1883 | ||
8feaf0c0 ACM |
1884 | dest = &tcp6tw->tw_v6_daddr; |
1885 | src = &tcp6tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1886 | destp = ntohs(tw->tw_dport); |
1887 | srcp = ntohs(tw->tw_sport); | |
1888 | ||
1889 | seq_printf(seq, | |
1890 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1891 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1892 | i, | |
1893 | src->s6_addr32[0], src->s6_addr32[1], | |
1894 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1895 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1896 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1897 | tw->tw_substate, 0, 0, | |
1898 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
1899 | atomic_read(&tw->tw_refcnt), tw); | |
1900 | } | |
1901 | ||
1902 | #ifdef CONFIG_PROC_FS | |
1903 | static int tcp6_seq_show(struct seq_file *seq, void *v) | |
1904 | { | |
1905 | struct tcp_iter_state *st; | |
1906 | ||
1907 | if (v == SEQ_START_TOKEN) { | |
1908 | seq_puts(seq, | |
1909 | " sl " | |
1910 | "local_address " | |
1911 | "remote_address " | |
1912 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1913 | " uid timeout inode\n"); | |
1914 | goto out; | |
1915 | } | |
1916 | st = seq->private; | |
1917 | ||
1918 | switch (st->state) { | |
1919 | case TCP_SEQ_STATE_LISTENING: | |
1920 | case TCP_SEQ_STATE_ESTABLISHED: | |
1921 | get_tcp6_sock(seq, v, st->num); | |
1922 | break; | |
1923 | case TCP_SEQ_STATE_OPENREQ: | |
1924 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
1925 | break; | |
1926 | case TCP_SEQ_STATE_TIME_WAIT: | |
1927 | get_timewait6_sock(seq, v, st->num); | |
1928 | break; | |
1929 | } | |
1930 | out: | |
1931 | return 0; | |
1932 | } | |
1933 | ||
1934 | static struct file_operations tcp6_seq_fops; | |
1935 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { | |
1936 | .owner = THIS_MODULE, | |
1937 | .name = "tcp6", | |
1938 | .family = AF_INET6, | |
1939 | .seq_show = tcp6_seq_show, | |
1940 | .seq_fops = &tcp6_seq_fops, | |
1941 | }; | |
1942 | ||
1943 | int __init tcp6_proc_init(void) | |
1944 | { | |
1945 | return tcp_proc_register(&tcp6_seq_afinfo); | |
1946 | } | |
1947 | ||
1948 | void tcp6_proc_exit(void) | |
1949 | { | |
1950 | tcp_proc_unregister(&tcp6_seq_afinfo); | |
1951 | } | |
1952 | #endif | |
1953 | ||
1954 | struct proto tcpv6_prot = { | |
1955 | .name = "TCPv6", | |
1956 | .owner = THIS_MODULE, | |
1957 | .close = tcp_close, | |
1958 | .connect = tcp_v6_connect, | |
1959 | .disconnect = tcp_disconnect, | |
463c84b9 | 1960 | .accept = inet_csk_accept, |
1da177e4 LT |
1961 | .ioctl = tcp_ioctl, |
1962 | .init = tcp_v6_init_sock, | |
1963 | .destroy = tcp_v6_destroy_sock, | |
1964 | .shutdown = tcp_shutdown, | |
1965 | .setsockopt = tcp_setsockopt, | |
1966 | .getsockopt = tcp_getsockopt, | |
1967 | .sendmsg = tcp_sendmsg, | |
1968 | .recvmsg = tcp_recvmsg, | |
1969 | .backlog_rcv = tcp_v6_do_rcv, | |
1970 | .hash = tcp_v6_hash, | |
1971 | .unhash = tcp_unhash, | |
1972 | .get_port = tcp_v6_get_port, | |
1973 | .enter_memory_pressure = tcp_enter_memory_pressure, | |
1974 | .sockets_allocated = &tcp_sockets_allocated, | |
1975 | .memory_allocated = &tcp_memory_allocated, | |
1976 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1977 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
1978 | .sysctl_mem = sysctl_tcp_mem, |
1979 | .sysctl_wmem = sysctl_tcp_wmem, | |
1980 | .sysctl_rmem = sysctl_tcp_rmem, | |
1981 | .max_header = MAX_TCP_HEADER, | |
1982 | .obj_size = sizeof(struct tcp6_sock), | |
8feaf0c0 | 1983 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), |
60236fdd | 1984 | .rsk_prot = &tcp6_request_sock_ops, |
1da177e4 LT |
1985 | }; |
1986 | ||
1987 | static struct inet6_protocol tcpv6_protocol = { | |
1988 | .handler = tcp_v6_rcv, | |
1989 | .err_handler = tcp_v6_err, | |
1990 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1991 | }; | |
1992 | ||
1da177e4 LT |
1993 | static struct inet_protosw tcpv6_protosw = { |
1994 | .type = SOCK_STREAM, | |
1995 | .protocol = IPPROTO_TCP, | |
1996 | .prot = &tcpv6_prot, | |
1997 | .ops = &inet6_stream_ops, | |
1998 | .capability = -1, | |
1999 | .no_check = 0, | |
2000 | .flags = INET_PROTOSW_PERMANENT, | |
2001 | }; | |
2002 | ||
2003 | void __init tcpv6_init(void) | |
2004 | { | |
2005 | /* register inet6 protocol */ | |
2006 | if (inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP) < 0) | |
2007 | printk(KERN_ERR "tcpv6_init: Could not register protocol\n"); | |
2008 | inet6_register_protosw(&tcpv6_protosw); | |
2009 | } |