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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> |
8129765a | 51 | #include <net/inet6_connection_sock.h> |
1da177e4 LT |
52 | #include <net/ipv6.h> |
53 | #include <net/transp_v6.h> | |
54 | #include <net/addrconf.h> | |
55 | #include <net/ip6_route.h> | |
56 | #include <net/ip6_checksum.h> | |
57 | #include <net/inet_ecn.h> | |
58 | #include <net/protocol.h> | |
59 | #include <net/xfrm.h> | |
60 | #include <net/addrconf.h> | |
61 | #include <net/snmp.h> | |
62 | #include <net/dsfield.h> | |
63 | ||
64 | #include <asm/uaccess.h> | |
65 | ||
66 | #include <linux/proc_fs.h> | |
67 | #include <linux/seq_file.h> | |
68 | ||
69 | static void tcp_v6_send_reset(struct sk_buff *skb); | |
60236fdd | 70 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req); |
8292a17a | 71 | static void tcp_v6_send_check(struct sock *sk, int len, |
1da177e4 LT |
72 | struct sk_buff *skb); |
73 | ||
74 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 75 | |
8292a17a ACM |
76 | static struct inet_connection_sock_af_ops ipv6_mapped; |
77 | static struct inet_connection_sock_af_ops ipv6_specific; | |
1da177e4 | 78 | |
1da177e4 LT |
79 | static int tcp_v6_get_port(struct sock *sk, unsigned short snum) |
80 | { | |
971af18b ACM |
81 | return inet_csk_get_port(&tcp_hashinfo, sk, snum, |
82 | inet6_csk_bind_conflict); | |
1da177e4 LT |
83 | } |
84 | ||
1da177e4 LT |
85 | static void tcp_v6_hash(struct sock *sk) |
86 | { | |
87 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 88 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
89 | tcp_prot.hash(sk); |
90 | return; | |
91 | } | |
92 | local_bh_disable(); | |
90b19d31 | 93 | __inet6_hash(&tcp_hashinfo, sk); |
1da177e4 LT |
94 | local_bh_enable(); |
95 | } | |
96 | } | |
97 | ||
1da177e4 LT |
98 | static __inline__ u16 tcp_v6_check(struct tcphdr *th, int len, |
99 | struct in6_addr *saddr, | |
100 | struct in6_addr *daddr, | |
101 | unsigned long base) | |
102 | { | |
103 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
104 | } | |
105 | ||
106 | static __u32 tcp_v6_init_sequence(struct sock *sk, struct sk_buff *skb) | |
107 | { | |
108 | if (skb->protocol == htons(ETH_P_IPV6)) { | |
109 | return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32, | |
110 | skb->nh.ipv6h->saddr.s6_addr32, | |
111 | skb->h.th->dest, | |
112 | skb->h.th->source); | |
113 | } else { | |
114 | return secure_tcp_sequence_number(skb->nh.iph->daddr, | |
115 | skb->nh.iph->saddr, | |
116 | skb->h.th->dest, | |
117 | skb->h.th->source); | |
118 | } | |
119 | } | |
120 | ||
505cbfc5 | 121 | static int __tcp_v6_check_established(struct sock *sk, const __u16 lport, |
8feaf0c0 | 122 | struct inet_timewait_sock **twp) |
1da177e4 LT |
123 | { |
124 | struct inet_sock *inet = inet_sk(sk); | |
505cbfc5 ACM |
125 | const struct ipv6_pinfo *np = inet6_sk(sk); |
126 | const struct in6_addr *daddr = &np->rcv_saddr; | |
127 | const struct in6_addr *saddr = &np->daddr; | |
128 | const int dif = sk->sk_bound_dev_if; | |
8feaf0c0 | 129 | const u32 ports = INET_COMBINED_PORTS(inet->dport, lport); |
81c3d547 ED |
130 | unsigned int hash = inet6_ehashfn(daddr, inet->num, saddr, inet->dport); |
131 | struct inet_ehash_bucket *head = inet_ehash_bucket(&tcp_hashinfo, hash); | |
1da177e4 | 132 | struct sock *sk2; |
8feaf0c0 ACM |
133 | const struct hlist_node *node; |
134 | struct inet_timewait_sock *tw; | |
1da177e4 | 135 | |
81c3d547 | 136 | prefetch(head->chain.first); |
1da177e4 LT |
137 | write_lock(&head->lock); |
138 | ||
139 | /* Check TIME-WAIT sockets first. */ | |
6e04e021 | 140 | sk_for_each(sk2, node, &(head + tcp_hashinfo.ehash_size)->chain) { |
0fa1a53e | 141 | const struct inet6_timewait_sock *tw6 = inet6_twsk(sk2); |
8feaf0c0 ACM |
142 | |
143 | tw = inet_twsk(sk2); | |
1da177e4 LT |
144 | |
145 | if(*((__u32 *)&(tw->tw_dport)) == ports && | |
146 | sk2->sk_family == PF_INET6 && | |
0fa1a53e ACM |
147 | ipv6_addr_equal(&tw6->tw_v6_daddr, saddr) && |
148 | ipv6_addr_equal(&tw6->tw_v6_rcv_saddr, daddr) && | |
1da177e4 | 149 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) { |
8feaf0c0 | 150 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sk2); |
1da177e4 LT |
151 | struct tcp_sock *tp = tcp_sk(sk); |
152 | ||
8feaf0c0 ACM |
153 | if (tcptw->tw_ts_recent_stamp && |
154 | (!twp || | |
155 | (sysctl_tcp_tw_reuse && | |
156 | xtime.tv_sec - tcptw->tw_ts_recent_stamp > 1))) { | |
1da177e4 | 157 | /* See comment in tcp_ipv4.c */ |
8feaf0c0 | 158 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; |
1da177e4 LT |
159 | if (!tp->write_seq) |
160 | tp->write_seq = 1; | |
8feaf0c0 ACM |
161 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; |
162 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; | |
1da177e4 LT |
163 | sock_hold(sk2); |
164 | goto unique; | |
165 | } else | |
166 | goto not_unique; | |
167 | } | |
168 | } | |
169 | tw = NULL; | |
170 | ||
171 | /* And established part... */ | |
172 | sk_for_each(sk2, node, &head->chain) { | |
81c3d547 | 173 | if (INET6_MATCH(sk2, hash, saddr, daddr, ports, dif)) |
1da177e4 LT |
174 | goto not_unique; |
175 | } | |
176 | ||
177 | unique: | |
178 | BUG_TRAP(sk_unhashed(sk)); | |
179 | __sk_add_node(sk, &head->chain); | |
81c3d547 | 180 | sk->sk_hash = hash; |
1da177e4 LT |
181 | sock_prot_inc_use(sk->sk_prot); |
182 | write_unlock(&head->lock); | |
183 | ||
184 | if (twp) { | |
185 | *twp = tw; | |
186 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); | |
187 | } else if (tw) { | |
188 | /* Silly. Should hash-dance instead... */ | |
295ff7ed | 189 | inet_twsk_deschedule(tw, &tcp_death_row); |
1da177e4 LT |
190 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); |
191 | ||
8feaf0c0 | 192 | inet_twsk_put(tw); |
1da177e4 LT |
193 | } |
194 | return 0; | |
195 | ||
196 | not_unique: | |
197 | write_unlock(&head->lock); | |
198 | return -EADDRNOTAVAIL; | |
199 | } | |
200 | ||
201 | static inline u32 tcpv6_port_offset(const struct sock *sk) | |
202 | { | |
203 | const struct inet_sock *inet = inet_sk(sk); | |
204 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
205 | ||
206 | return secure_tcpv6_port_ephemeral(np->rcv_saddr.s6_addr32, | |
207 | np->daddr.s6_addr32, | |
208 | inet->dport); | |
209 | } | |
210 | ||
211 | static int tcp_v6_hash_connect(struct sock *sk) | |
212 | { | |
213 | unsigned short snum = inet_sk(sk)->num; | |
0f7ff927 ACM |
214 | struct inet_bind_hashbucket *head; |
215 | struct inet_bind_bucket *tb; | |
1da177e4 LT |
216 | int ret; |
217 | ||
218 | if (!snum) { | |
219 | int low = sysctl_local_port_range[0]; | |
220 | int high = sysctl_local_port_range[1]; | |
221 | int range = high - low; | |
222 | int i; | |
223 | int port; | |
224 | static u32 hint; | |
225 | u32 offset = hint + tcpv6_port_offset(sk); | |
226 | struct hlist_node *node; | |
8feaf0c0 | 227 | struct inet_timewait_sock *tw = NULL; |
1da177e4 LT |
228 | |
229 | local_bh_disable(); | |
230 | for (i = 1; i <= range; i++) { | |
231 | port = low + (i + offset) % range; | |
6e04e021 | 232 | head = &tcp_hashinfo.bhash[inet_bhashfn(port, tcp_hashinfo.bhash_size)]; |
1da177e4 LT |
233 | spin_lock(&head->lock); |
234 | ||
235 | /* Does not bother with rcv_saddr checks, | |
236 | * because the established check is already | |
237 | * unique enough. | |
238 | */ | |
0f7ff927 | 239 | inet_bind_bucket_for_each(tb, node, &head->chain) { |
1da177e4 LT |
240 | if (tb->port == port) { |
241 | BUG_TRAP(!hlist_empty(&tb->owners)); | |
242 | if (tb->fastreuse >= 0) | |
243 | goto next_port; | |
244 | if (!__tcp_v6_check_established(sk, | |
245 | port, | |
246 | &tw)) | |
247 | goto ok; | |
248 | goto next_port; | |
249 | } | |
250 | } | |
251 | ||
6e04e021 | 252 | tb = inet_bind_bucket_create(tcp_hashinfo.bind_bucket_cachep, head, port); |
1da177e4 LT |
253 | if (!tb) { |
254 | spin_unlock(&head->lock); | |
255 | break; | |
256 | } | |
257 | tb->fastreuse = -1; | |
258 | goto ok; | |
259 | ||
260 | next_port: | |
261 | spin_unlock(&head->lock); | |
262 | } | |
263 | local_bh_enable(); | |
264 | ||
265 | return -EADDRNOTAVAIL; | |
266 | ||
267 | ok: | |
268 | hint += i; | |
269 | ||
270 | /* Head lock still held and bh's disabled */ | |
2d8c4ce5 | 271 | inet_bind_hash(sk, tb, port); |
1da177e4 LT |
272 | if (sk_unhashed(sk)) { |
273 | inet_sk(sk)->sport = htons(port); | |
90b19d31 | 274 | __inet6_hash(&tcp_hashinfo, sk); |
1da177e4 LT |
275 | } |
276 | spin_unlock(&head->lock); | |
277 | ||
278 | if (tw) { | |
295ff7ed | 279 | inet_twsk_deschedule(tw, &tcp_death_row); |
8feaf0c0 | 280 | inet_twsk_put(tw); |
1da177e4 LT |
281 | } |
282 | ||
283 | ret = 0; | |
284 | goto out; | |
285 | } | |
286 | ||
6e04e021 | 287 | head = &tcp_hashinfo.bhash[inet_bhashfn(snum, tcp_hashinfo.bhash_size)]; |
463c84b9 | 288 | tb = inet_csk(sk)->icsk_bind_hash; |
1da177e4 LT |
289 | spin_lock_bh(&head->lock); |
290 | ||
291 | if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) { | |
90b19d31 | 292 | __inet6_hash(&tcp_hashinfo, sk); |
1da177e4 LT |
293 | spin_unlock_bh(&head->lock); |
294 | return 0; | |
295 | } else { | |
296 | spin_unlock(&head->lock); | |
297 | /* No definite answer... Walk to established hash table */ | |
298 | ret = __tcp_v6_check_established(sk, snum, NULL); | |
299 | out: | |
300 | local_bh_enable(); | |
301 | return ret; | |
302 | } | |
303 | } | |
304 | ||
1da177e4 LT |
305 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
306 | int addr_len) | |
307 | { | |
308 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
309 | struct inet_sock *inet = inet_sk(sk); | |
310 | struct ipv6_pinfo *np = inet6_sk(sk); | |
311 | struct tcp_sock *tp = tcp_sk(sk); | |
312 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
313 | struct flowi fl; | |
314 | struct dst_entry *dst; | |
315 | int addr_type; | |
316 | int err; | |
317 | ||
318 | if (addr_len < SIN6_LEN_RFC2133) | |
319 | return -EINVAL; | |
320 | ||
321 | if (usin->sin6_family != AF_INET6) | |
322 | return(-EAFNOSUPPORT); | |
323 | ||
324 | memset(&fl, 0, sizeof(fl)); | |
325 | ||
326 | if (np->sndflow) { | |
327 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
328 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
329 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
330 | struct ip6_flowlabel *flowlabel; | |
331 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
332 | if (flowlabel == NULL) | |
333 | return -EINVAL; | |
334 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
335 | fl6_sock_release(flowlabel); | |
336 | } | |
337 | } | |
338 | ||
339 | /* | |
340 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
341 | */ | |
342 | ||
343 | if(ipv6_addr_any(&usin->sin6_addr)) | |
344 | usin->sin6_addr.s6_addr[15] = 0x1; | |
345 | ||
346 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
347 | ||
348 | if(addr_type & IPV6_ADDR_MULTICAST) | |
349 | return -ENETUNREACH; | |
350 | ||
351 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
352 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
353 | usin->sin6_scope_id) { | |
354 | /* If interface is set while binding, indices | |
355 | * must coincide. | |
356 | */ | |
357 | if (sk->sk_bound_dev_if && | |
358 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
359 | return -EINVAL; | |
360 | ||
361 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
362 | } | |
363 | ||
364 | /* Connect to link-local address requires an interface */ | |
365 | if (!sk->sk_bound_dev_if) | |
366 | return -EINVAL; | |
367 | } | |
368 | ||
369 | if (tp->rx_opt.ts_recent_stamp && | |
370 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
371 | tp->rx_opt.ts_recent = 0; | |
372 | tp->rx_opt.ts_recent_stamp = 0; | |
373 | tp->write_seq = 0; | |
374 | } | |
375 | ||
376 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
377 | np->flow_label = fl.fl6_flowlabel; | |
378 | ||
379 | /* | |
380 | * TCP over IPv4 | |
381 | */ | |
382 | ||
383 | if (addr_type == IPV6_ADDR_MAPPED) { | |
384 | u32 exthdrlen = tp->ext_header_len; | |
385 | struct sockaddr_in sin; | |
386 | ||
387 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
388 | ||
389 | if (__ipv6_only_sock(sk)) | |
390 | return -ENETUNREACH; | |
391 | ||
392 | sin.sin_family = AF_INET; | |
393 | sin.sin_port = usin->sin6_port; | |
394 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
395 | ||
8292a17a | 396 | inet_csk(sk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 LT |
397 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
398 | ||
399 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
400 | ||
401 | if (err) { | |
402 | tp->ext_header_len = exthdrlen; | |
8292a17a | 403 | inet_csk(sk)->icsk_af_ops = &ipv6_specific; |
1da177e4 LT |
404 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
405 | goto failure; | |
406 | } else { | |
407 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
408 | inet->saddr); | |
409 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
410 | inet->rcv_saddr); | |
411 | } | |
412 | ||
413 | return err; | |
414 | } | |
415 | ||
416 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
417 | saddr = &np->rcv_saddr; | |
418 | ||
419 | fl.proto = IPPROTO_TCP; | |
420 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
421 | ipv6_addr_copy(&fl.fl6_src, | |
422 | (saddr ? saddr : &np->saddr)); | |
423 | fl.oif = sk->sk_bound_dev_if; | |
424 | fl.fl_ip_dport = usin->sin6_port; | |
425 | fl.fl_ip_sport = inet->sport; | |
426 | ||
427 | if (np->opt && np->opt->srcrt) { | |
428 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
429 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
430 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
431 | final_p = &final; | |
432 | } | |
433 | ||
434 | err = ip6_dst_lookup(sk, &dst, &fl); | |
435 | if (err) | |
436 | goto failure; | |
437 | if (final_p) | |
438 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
439 | ||
e104411b | 440 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
1da177e4 | 441 | goto failure; |
1da177e4 LT |
442 | |
443 | if (saddr == NULL) { | |
444 | saddr = &fl.fl6_src; | |
445 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
446 | } | |
447 | ||
448 | /* set the source address */ | |
449 | ipv6_addr_copy(&np->saddr, saddr); | |
450 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
451 | ||
452 | ip6_dst_store(sk, dst, NULL); | |
453 | sk->sk_route_caps = dst->dev->features & | |
454 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
455 | ||
456 | tp->ext_header_len = 0; | |
457 | if (np->opt) | |
458 | tp->ext_header_len = np->opt->opt_flen + np->opt->opt_nflen; | |
459 | ||
460 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
461 | ||
462 | inet->dport = usin->sin6_port; | |
463 | ||
464 | tcp_set_state(sk, TCP_SYN_SENT); | |
465 | err = tcp_v6_hash_connect(sk); | |
466 | if (err) | |
467 | goto late_failure; | |
468 | ||
469 | if (!tp->write_seq) | |
470 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
471 | np->daddr.s6_addr32, | |
472 | inet->sport, | |
473 | inet->dport); | |
474 | ||
475 | err = tcp_connect(sk); | |
476 | if (err) | |
477 | goto late_failure; | |
478 | ||
479 | return 0; | |
480 | ||
481 | late_failure: | |
482 | tcp_set_state(sk, TCP_CLOSE); | |
483 | __sk_dst_reset(sk); | |
484 | failure: | |
485 | inet->dport = 0; | |
486 | sk->sk_route_caps = 0; | |
487 | return err; | |
488 | } | |
489 | ||
490 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
491 | int type, int code, int offset, __u32 info) | |
492 | { | |
493 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
505cbfc5 | 494 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
495 | struct ipv6_pinfo *np; |
496 | struct sock *sk; | |
497 | int err; | |
498 | struct tcp_sock *tp; | |
499 | __u32 seq; | |
500 | ||
505cbfc5 ACM |
501 | sk = inet6_lookup(&tcp_hashinfo, &hdr->daddr, th->dest, &hdr->saddr, |
502 | th->source, skb->dev->ifindex); | |
1da177e4 LT |
503 | |
504 | if (sk == NULL) { | |
505 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
506 | return; | |
507 | } | |
508 | ||
509 | if (sk->sk_state == TCP_TIME_WAIT) { | |
8feaf0c0 | 510 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
511 | return; |
512 | } | |
513 | ||
514 | bh_lock_sock(sk); | |
515 | if (sock_owned_by_user(sk)) | |
516 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
517 | ||
518 | if (sk->sk_state == TCP_CLOSE) | |
519 | goto out; | |
520 | ||
521 | tp = tcp_sk(sk); | |
522 | seq = ntohl(th->seq); | |
523 | if (sk->sk_state != TCP_LISTEN && | |
524 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
525 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
526 | goto out; | |
527 | } | |
528 | ||
529 | np = inet6_sk(sk); | |
530 | ||
531 | if (type == ICMPV6_PKT_TOOBIG) { | |
532 | struct dst_entry *dst = NULL; | |
533 | ||
534 | if (sock_owned_by_user(sk)) | |
535 | goto out; | |
536 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
537 | goto out; | |
538 | ||
539 | /* icmp should have updated the destination cache entry */ | |
540 | dst = __sk_dst_check(sk, np->dst_cookie); | |
541 | ||
542 | if (dst == NULL) { | |
543 | struct inet_sock *inet = inet_sk(sk); | |
544 | struct flowi fl; | |
545 | ||
546 | /* BUGGG_FUTURE: Again, it is not clear how | |
547 | to handle rthdr case. Ignore this complexity | |
548 | for now. | |
549 | */ | |
550 | memset(&fl, 0, sizeof(fl)); | |
551 | fl.proto = IPPROTO_TCP; | |
552 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
553 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
554 | fl.oif = sk->sk_bound_dev_if; | |
555 | fl.fl_ip_dport = inet->dport; | |
556 | fl.fl_ip_sport = inet->sport; | |
557 | ||
558 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
559 | sk->sk_err_soft = -err; | |
560 | goto out; | |
561 | } | |
562 | ||
563 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
564 | sk->sk_err_soft = -err; | |
565 | goto out; | |
566 | } | |
567 | ||
568 | } else | |
569 | dst_hold(dst); | |
570 | ||
571 | if (tp->pmtu_cookie > dst_mtu(dst)) { | |
572 | tcp_sync_mss(sk, dst_mtu(dst)); | |
573 | tcp_simple_retransmit(sk); | |
574 | } /* else let the usual retransmit timer handle it */ | |
575 | dst_release(dst); | |
576 | goto out; | |
577 | } | |
578 | ||
579 | icmpv6_err_convert(type, code, &err); | |
580 | ||
60236fdd | 581 | /* Might be for an request_sock */ |
1da177e4 | 582 | switch (sk->sk_state) { |
60236fdd | 583 | struct request_sock *req, **prev; |
1da177e4 LT |
584 | case TCP_LISTEN: |
585 | if (sock_owned_by_user(sk)) | |
586 | goto out; | |
587 | ||
8129765a ACM |
588 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
589 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
590 | if (!req) |
591 | goto out; | |
592 | ||
593 | /* ICMPs are not backlogged, hence we cannot get | |
594 | * an established socket here. | |
595 | */ | |
596 | BUG_TRAP(req->sk == NULL); | |
597 | ||
2e6599cb | 598 | if (seq != tcp_rsk(req)->snt_isn) { |
1da177e4 LT |
599 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
600 | goto out; | |
601 | } | |
602 | ||
463c84b9 | 603 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
604 | goto out; |
605 | ||
606 | case TCP_SYN_SENT: | |
607 | case TCP_SYN_RECV: /* Cannot happen. | |
608 | It can, it SYNs are crossed. --ANK */ | |
609 | if (!sock_owned_by_user(sk)) { | |
610 | TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS); | |
611 | sk->sk_err = err; | |
612 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
613 | ||
614 | tcp_done(sk); | |
615 | } else | |
616 | sk->sk_err_soft = err; | |
617 | goto out; | |
618 | } | |
619 | ||
620 | if (!sock_owned_by_user(sk) && np->recverr) { | |
621 | sk->sk_err = err; | |
622 | sk->sk_error_report(sk); | |
623 | } else | |
624 | sk->sk_err_soft = err; | |
625 | ||
626 | out: | |
627 | bh_unlock_sock(sk); | |
628 | sock_put(sk); | |
629 | } | |
630 | ||
631 | ||
60236fdd | 632 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, |
1da177e4 LT |
633 | struct dst_entry *dst) |
634 | { | |
ca304b61 | 635 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
636 | struct ipv6_pinfo *np = inet6_sk(sk); |
637 | struct sk_buff * skb; | |
638 | struct ipv6_txoptions *opt = NULL; | |
639 | struct in6_addr * final_p = NULL, final; | |
640 | struct flowi fl; | |
641 | int err = -1; | |
642 | ||
643 | memset(&fl, 0, sizeof(fl)); | |
644 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
645 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
646 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 647 | fl.fl6_flowlabel = 0; |
2e6599cb ACM |
648 | fl.oif = treq->iif; |
649 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
1da177e4 LT |
650 | fl.fl_ip_sport = inet_sk(sk)->sport; |
651 | ||
652 | if (dst == NULL) { | |
653 | opt = np->opt; | |
654 | if (opt == NULL && | |
333fad53 | 655 | np->rxopt.bits.osrcrt == 2 && |
2e6599cb ACM |
656 | treq->pktopts) { |
657 | struct sk_buff *pktopts = treq->pktopts; | |
1da177e4 LT |
658 | struct inet6_skb_parm *rxopt = IP6CB(pktopts); |
659 | if (rxopt->srcrt) | |
660 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr*)(pktopts->nh.raw + rxopt->srcrt)); | |
661 | } | |
662 | ||
663 | if (opt && opt->srcrt) { | |
664 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
665 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
666 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
667 | final_p = &final; | |
668 | } | |
669 | ||
670 | err = ip6_dst_lookup(sk, &dst, &fl); | |
671 | if (err) | |
672 | goto done; | |
673 | if (final_p) | |
674 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
675 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
676 | goto done; | |
677 | } | |
678 | ||
679 | skb = tcp_make_synack(sk, dst, req); | |
680 | if (skb) { | |
681 | struct tcphdr *th = skb->h.th; | |
682 | ||
683 | th->check = tcp_v6_check(th, skb->len, | |
2e6599cb | 684 | &treq->loc_addr, &treq->rmt_addr, |
1da177e4 LT |
685 | csum_partial((char *)th, skb->len, skb->csum)); |
686 | ||
2e6599cb | 687 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
688 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
689 | if (err == NET_XMIT_CN) | |
690 | err = 0; | |
691 | } | |
692 | ||
693 | done: | |
1da177e4 LT |
694 | if (opt && opt != np->opt) |
695 | sock_kfree_s(sk, opt, opt->tot_len); | |
696 | return err; | |
697 | } | |
698 | ||
60236fdd | 699 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 700 | { |
ca304b61 ACM |
701 | if (inet6_rsk(req)->pktopts) |
702 | kfree_skb(inet6_rsk(req)->pktopts); | |
1da177e4 LT |
703 | } |
704 | ||
60236fdd | 705 | static struct request_sock_ops tcp6_request_sock_ops = { |
1da177e4 | 706 | .family = AF_INET6, |
2e6599cb | 707 | .obj_size = sizeof(struct tcp6_request_sock), |
1da177e4 | 708 | .rtx_syn_ack = tcp_v6_send_synack, |
60236fdd ACM |
709 | .send_ack = tcp_v6_reqsk_send_ack, |
710 | .destructor = tcp_v6_reqsk_destructor, | |
1da177e4 LT |
711 | .send_reset = tcp_v6_send_reset |
712 | }; | |
713 | ||
8292a17a | 714 | static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) |
1da177e4 LT |
715 | { |
716 | struct ipv6_pinfo *np = inet6_sk(sk); | |
8292a17a | 717 | struct tcphdr *th = skb->h.th; |
1da177e4 LT |
718 | |
719 | if (skb->ip_summed == CHECKSUM_HW) { | |
720 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); | |
721 | skb->csum = offsetof(struct tcphdr, check); | |
722 | } else { | |
723 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, | |
724 | csum_partial((char *)th, th->doff<<2, | |
725 | skb->csum)); | |
726 | } | |
727 | } | |
728 | ||
729 | ||
730 | static void tcp_v6_send_reset(struct sk_buff *skb) | |
731 | { | |
732 | struct tcphdr *th = skb->h.th, *t1; | |
733 | struct sk_buff *buff; | |
734 | struct flowi fl; | |
735 | ||
736 | if (th->rst) | |
737 | return; | |
738 | ||
739 | if (!ipv6_unicast_destination(skb)) | |
740 | return; | |
741 | ||
742 | /* | |
743 | * We need to grab some memory, and put together an RST, | |
744 | * and then put it into the queue to be sent. | |
745 | */ | |
746 | ||
747 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr), | |
748 | GFP_ATOMIC); | |
749 | if (buff == NULL) | |
750 | return; | |
751 | ||
752 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr)); | |
753 | ||
754 | t1 = (struct tcphdr *) skb_push(buff,sizeof(struct tcphdr)); | |
755 | ||
756 | /* Swap the send and the receive. */ | |
757 | memset(t1, 0, sizeof(*t1)); | |
758 | t1->dest = th->source; | |
759 | t1->source = th->dest; | |
760 | t1->doff = sizeof(*t1)/4; | |
761 | t1->rst = 1; | |
762 | ||
763 | if(th->ack) { | |
764 | t1->seq = th->ack_seq; | |
765 | } else { | |
766 | t1->ack = 1; | |
767 | t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin | |
768 | + skb->len - (th->doff<<2)); | |
769 | } | |
770 | ||
771 | buff->csum = csum_partial((char *)t1, sizeof(*t1), 0); | |
772 | ||
773 | memset(&fl, 0, sizeof(fl)); | |
774 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); | |
775 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); | |
776 | ||
777 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
778 | sizeof(*t1), IPPROTO_TCP, | |
779 | buff->csum); | |
780 | ||
781 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 782 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
783 | fl.fl_ip_dport = t1->dest; |
784 | fl.fl_ip_sport = t1->source; | |
785 | ||
786 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
787 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
788 | ||
ecc51b6d ACM |
789 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
790 | ip6_xmit(NULL, buff, &fl, NULL, 0); | |
791 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
792 | TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); | |
1da177e4 | 793 | return; |
ecc51b6d | 794 | } |
1da177e4 LT |
795 | } |
796 | ||
797 | kfree_skb(buff); | |
798 | } | |
799 | ||
800 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts) | |
801 | { | |
802 | struct tcphdr *th = skb->h.th, *t1; | |
803 | struct sk_buff *buff; | |
804 | struct flowi fl; | |
805 | int tot_len = sizeof(struct tcphdr); | |
806 | ||
807 | if (ts) | |
808 | tot_len += 3*4; | |
809 | ||
810 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, | |
811 | GFP_ATOMIC); | |
812 | if (buff == NULL) | |
813 | return; | |
814 | ||
815 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); | |
816 | ||
817 | t1 = (struct tcphdr *) skb_push(buff,tot_len); | |
818 | ||
819 | /* Swap the send and the receive. */ | |
820 | memset(t1, 0, sizeof(*t1)); | |
821 | t1->dest = th->source; | |
822 | t1->source = th->dest; | |
823 | t1->doff = tot_len/4; | |
824 | t1->seq = htonl(seq); | |
825 | t1->ack_seq = htonl(ack); | |
826 | t1->ack = 1; | |
827 | t1->window = htons(win); | |
828 | ||
829 | if (ts) { | |
830 | u32 *ptr = (u32*)(t1 + 1); | |
831 | *ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
832 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
833 | *ptr++ = htonl(tcp_time_stamp); | |
834 | *ptr = htonl(ts); | |
835 | } | |
836 | ||
837 | buff->csum = csum_partial((char *)t1, tot_len, 0); | |
838 | ||
839 | memset(&fl, 0, sizeof(fl)); | |
840 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); | |
841 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); | |
842 | ||
843 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
844 | tot_len, IPPROTO_TCP, | |
845 | buff->csum); | |
846 | ||
847 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 848 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
849 | fl.fl_ip_dport = t1->dest; |
850 | fl.fl_ip_sport = t1->source; | |
851 | ||
852 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
ecc51b6d ACM |
853 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
854 | ip6_xmit(NULL, buff, &fl, NULL, 0); | |
855 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
1da177e4 | 856 | return; |
ecc51b6d | 857 | } |
1da177e4 LT |
858 | } |
859 | ||
860 | kfree_skb(buff); | |
861 | } | |
862 | ||
863 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
864 | { | |
8feaf0c0 ACM |
865 | struct inet_timewait_sock *tw = inet_twsk(sk); |
866 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sk); | |
1da177e4 | 867 | |
8feaf0c0 ACM |
868 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
869 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, | |
870 | tcptw->tw_ts_recent); | |
1da177e4 | 871 | |
8feaf0c0 | 872 | inet_twsk_put(tw); |
1da177e4 LT |
873 | } |
874 | ||
60236fdd | 875 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req) |
1da177e4 | 876 | { |
2e6599cb | 877 | 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 |
878 | } |
879 | ||
880 | ||
881 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
882 | { | |
60236fdd | 883 | struct request_sock *req, **prev; |
505cbfc5 | 884 | const struct tcphdr *th = skb->h.th; |
1da177e4 LT |
885 | struct sock *nsk; |
886 | ||
887 | /* Find possible connection requests. */ | |
8129765a ACM |
888 | req = inet6_csk_search_req(sk, &prev, th->source, |
889 | &skb->nh.ipv6h->saddr, | |
890 | &skb->nh.ipv6h->daddr, inet6_iif(skb)); | |
1da177e4 LT |
891 | if (req) |
892 | return tcp_check_req(sk, skb, req, prev); | |
893 | ||
505cbfc5 ACM |
894 | nsk = __inet6_lookup_established(&tcp_hashinfo, &skb->nh.ipv6h->saddr, |
895 | th->source, &skb->nh.ipv6h->daddr, | |
896 | ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
897 | |
898 | if (nsk) { | |
899 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
900 | bh_lock_sock(nsk); | |
901 | return nsk; | |
902 | } | |
8feaf0c0 | 903 | inet_twsk_put((struct inet_timewait_sock *)nsk); |
1da177e4 LT |
904 | return NULL; |
905 | } | |
906 | ||
907 | #if 0 /*def CONFIG_SYN_COOKIES*/ | |
908 | if (!th->rst && !th->syn && th->ack) | |
909 | sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt)); | |
910 | #endif | |
911 | return sk; | |
912 | } | |
913 | ||
1da177e4 LT |
914 | /* FIXME: this is substantially similar to the ipv4 code. |
915 | * Can some kind of merge be done? -- erics | |
916 | */ | |
917 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
918 | { | |
ca304b61 | 919 | struct inet6_request_sock *treq; |
1da177e4 LT |
920 | struct ipv6_pinfo *np = inet6_sk(sk); |
921 | struct tcp_options_received tmp_opt; | |
922 | struct tcp_sock *tp = tcp_sk(sk); | |
60236fdd | 923 | struct request_sock *req = NULL; |
1da177e4 LT |
924 | __u32 isn = TCP_SKB_CB(skb)->when; |
925 | ||
926 | if (skb->protocol == htons(ETH_P_IP)) | |
927 | return tcp_v4_conn_request(sk, skb); | |
928 | ||
929 | if (!ipv6_unicast_destination(skb)) | |
930 | goto drop; | |
931 | ||
932 | /* | |
933 | * There are no SYN attacks on IPv6, yet... | |
934 | */ | |
463c84b9 | 935 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 LT |
936 | if (net_ratelimit()) |
937 | printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n"); | |
938 | goto drop; | |
939 | } | |
940 | ||
463c84b9 | 941 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
942 | goto drop; |
943 | ||
ca304b61 | 944 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
945 | if (req == NULL) |
946 | goto drop; | |
947 | ||
948 | tcp_clear_options(&tmp_opt); | |
949 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
950 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
951 | ||
952 | tcp_parse_options(skb, &tmp_opt, 0); | |
953 | ||
954 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; | |
955 | tcp_openreq_init(req, &tmp_opt, skb); | |
956 | ||
ca304b61 | 957 | treq = inet6_rsk(req); |
2e6599cb ACM |
958 | ipv6_addr_copy(&treq->rmt_addr, &skb->nh.ipv6h->saddr); |
959 | ipv6_addr_copy(&treq->loc_addr, &skb->nh.ipv6h->daddr); | |
1da177e4 | 960 | TCP_ECN_create_request(req, skb->h.th); |
2e6599cb | 961 | treq->pktopts = NULL; |
1da177e4 | 962 | if (ipv6_opt_accepted(sk, skb) || |
333fad53 YH |
963 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
964 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1da177e4 | 965 | atomic_inc(&skb->users); |
2e6599cb | 966 | treq->pktopts = skb; |
1da177e4 | 967 | } |
2e6599cb | 968 | treq->iif = sk->sk_bound_dev_if; |
1da177e4 LT |
969 | |
970 | /* So that link locals have meaning */ | |
971 | if (!sk->sk_bound_dev_if && | |
2e6599cb | 972 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) |
505cbfc5 | 973 | treq->iif = inet6_iif(skb); |
1da177e4 LT |
974 | |
975 | if (isn == 0) | |
976 | isn = tcp_v6_init_sequence(sk,skb); | |
977 | ||
2e6599cb | 978 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 LT |
979 | |
980 | if (tcp_v6_send_synack(sk, req, NULL)) | |
981 | goto drop; | |
982 | ||
8129765a | 983 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1da177e4 LT |
984 | return 0; |
985 | ||
986 | drop: | |
987 | if (req) | |
60236fdd | 988 | reqsk_free(req); |
1da177e4 LT |
989 | |
990 | TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS); | |
991 | return 0; /* don't send reset */ | |
992 | } | |
993 | ||
994 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 995 | struct request_sock *req, |
1da177e4 LT |
996 | struct dst_entry *dst) |
997 | { | |
ca304b61 | 998 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
999 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1000 | struct tcp6_sock *newtcp6sk; | |
1001 | struct inet_sock *newinet; | |
1002 | struct tcp_sock *newtp; | |
1003 | struct sock *newsk; | |
1004 | struct ipv6_txoptions *opt; | |
1005 | ||
1006 | if (skb->protocol == htons(ETH_P_IP)) { | |
1007 | /* | |
1008 | * v6 mapped | |
1009 | */ | |
1010 | ||
1011 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1012 | ||
1013 | if (newsk == NULL) | |
1014 | return NULL; | |
1015 | ||
1016 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1017 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1018 | ||
1019 | newinet = inet_sk(newsk); | |
1020 | newnp = inet6_sk(newsk); | |
1021 | newtp = tcp_sk(newsk); | |
1022 | ||
1023 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1024 | ||
1025 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
1026 | newinet->daddr); | |
1027 | ||
1028 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
1029 | newinet->saddr); | |
1030 | ||
1031 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1032 | ||
8292a17a | 1033 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 LT |
1034 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
1035 | newnp->pktoptions = NULL; | |
1036 | newnp->opt = NULL; | |
505cbfc5 | 1037 | newnp->mcast_oif = inet6_iif(skb); |
1da177e4 LT |
1038 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; |
1039 | ||
e6848976 ACM |
1040 | /* |
1041 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1042 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1043 | * that function for the gory details. -acme | |
1da177e4 | 1044 | */ |
1da177e4 LT |
1045 | |
1046 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1047 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1048 | Sync it now. |
1049 | */ | |
1050 | tcp_sync_mss(newsk, newtp->pmtu_cookie); | |
1051 | ||
1052 | return newsk; | |
1053 | } | |
1054 | ||
1055 | opt = np->opt; | |
1056 | ||
1057 | if (sk_acceptq_is_full(sk)) | |
1058 | goto out_overflow; | |
1059 | ||
333fad53 | 1060 | if (np->rxopt.bits.osrcrt == 2 && |
2e6599cb ACM |
1061 | opt == NULL && treq->pktopts) { |
1062 | struct inet6_skb_parm *rxopt = IP6CB(treq->pktopts); | |
1da177e4 | 1063 | if (rxopt->srcrt) |
2e6599cb | 1064 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr *)(treq->pktopts->nh.raw + rxopt->srcrt)); |
1da177e4 LT |
1065 | } |
1066 | ||
1067 | if (dst == NULL) { | |
1068 | struct in6_addr *final_p = NULL, final; | |
1069 | struct flowi fl; | |
1070 | ||
1071 | memset(&fl, 0, sizeof(fl)); | |
1072 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1073 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
1074 | if (opt && opt->srcrt) { |
1075 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1076 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1077 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1078 | final_p = &final; | |
1079 | } | |
2e6599cb | 1080 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1081 | fl.oif = sk->sk_bound_dev_if; |
2e6599cb | 1082 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
1da177e4 LT |
1083 | fl.fl_ip_sport = inet_sk(sk)->sport; |
1084 | ||
1085 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1086 | goto out; | |
1087 | ||
1088 | if (final_p) | |
1089 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1090 | ||
1091 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
1092 | goto out; | |
1093 | } | |
1094 | ||
1095 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1096 | if (newsk == NULL) | |
1097 | goto out; | |
1098 | ||
e6848976 ACM |
1099 | /* |
1100 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1101 | * count here, tcp_create_openreq_child now does this for us, see the | |
1102 | * comment in that function for the gory details. -acme | |
1103 | */ | |
1da177e4 LT |
1104 | |
1105 | ip6_dst_store(newsk, dst, NULL); | |
1106 | newsk->sk_route_caps = dst->dev->features & | |
1107 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1108 | ||
1109 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1110 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1111 | ||
1112 | newtp = tcp_sk(newsk); | |
1113 | newinet = inet_sk(newsk); | |
1114 | newnp = inet6_sk(newsk); | |
1115 | ||
1116 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1117 | ||
2e6599cb ACM |
1118 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1119 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1120 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1121 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 LT |
1122 | |
1123 | /* Now IPv6 options... | |
1124 | ||
1125 | First: no IPv4 options. | |
1126 | */ | |
1127 | newinet->opt = NULL; | |
1128 | ||
1129 | /* Clone RX bits */ | |
1130 | newnp->rxopt.all = np->rxopt.all; | |
1131 | ||
1132 | /* Clone pktoptions received with SYN */ | |
1133 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1134 | if (treq->pktopts != NULL) { |
1135 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1136 | kfree_skb(treq->pktopts); | |
1137 | treq->pktopts = NULL; | |
1da177e4 LT |
1138 | if (newnp->pktoptions) |
1139 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1140 | } | |
1141 | newnp->opt = NULL; | |
505cbfc5 | 1142 | newnp->mcast_oif = inet6_iif(skb); |
1da177e4 LT |
1143 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; |
1144 | ||
1145 | /* Clone native IPv6 options from listening socket (if any) | |
1146 | ||
1147 | Yes, keeping reference count would be much more clever, | |
1148 | but we make one more one thing there: reattach optmem | |
1149 | to newsk. | |
1150 | */ | |
1151 | if (opt) { | |
1152 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1153 | if (opt != np->opt) | |
1154 | sock_kfree_s(sk, opt, opt->tot_len); | |
1155 | } | |
1156 | ||
1157 | newtp->ext_header_len = 0; | |
1158 | if (newnp->opt) | |
1159 | newtp->ext_header_len = newnp->opt->opt_nflen + | |
1160 | newnp->opt->opt_flen; | |
1161 | ||
1162 | tcp_sync_mss(newsk, dst_mtu(dst)); | |
1163 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1164 | tcp_initialize_rcv_mss(newsk); | |
1165 | ||
1166 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
1167 | ||
90b19d31 | 1168 | __inet6_hash(&tcp_hashinfo, newsk); |
2d8c4ce5 | 1169 | inet_inherit_port(&tcp_hashinfo, sk, newsk); |
1da177e4 LT |
1170 | |
1171 | return newsk; | |
1172 | ||
1173 | out_overflow: | |
1174 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
1175 | out: | |
1176 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
1177 | if (opt && opt != np->opt) | |
1178 | sock_kfree_s(sk, opt, opt->tot_len); | |
1179 | dst_release(dst); | |
1180 | return NULL; | |
1181 | } | |
1182 | ||
1183 | static int tcp_v6_checksum_init(struct sk_buff *skb) | |
1184 | { | |
1185 | if (skb->ip_summed == CHECKSUM_HW) { | |
1da177e4 | 1186 | if (!tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, |
fb286bb2 HX |
1187 | &skb->nh.ipv6h->daddr,skb->csum)) { |
1188 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1da177e4 | 1189 | return 0; |
fb286bb2 | 1190 | } |
1da177e4 | 1191 | } |
fb286bb2 HX |
1192 | |
1193 | skb->csum = ~tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, | |
1194 | &skb->nh.ipv6h->daddr, 0); | |
1195 | ||
1da177e4 | 1196 | if (skb->len <= 76) { |
fb286bb2 | 1197 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1198 | } |
1199 | return 0; | |
1200 | } | |
1201 | ||
1202 | /* The socket must have it's spinlock held when we get | |
1203 | * here. | |
1204 | * | |
1205 | * We have a potential double-lock case here, so even when | |
1206 | * doing backlog processing we use the BH locking scheme. | |
1207 | * This is because we cannot sleep with the original spinlock | |
1208 | * held. | |
1209 | */ | |
1210 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1211 | { | |
1212 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1213 | struct tcp_sock *tp; | |
1214 | struct sk_buff *opt_skb = NULL; | |
1215 | ||
1216 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1217 | goes to IPv4 receive handler and backlogged. | |
1218 | From backlog it always goes here. Kerboom... | |
1219 | Fortunately, tcp_rcv_established and rcv_established | |
1220 | handle them correctly, but it is not case with | |
1221 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1222 | */ | |
1223 | ||
1224 | if (skb->protocol == htons(ETH_P_IP)) | |
1225 | return tcp_v4_do_rcv(sk, skb); | |
1226 | ||
1227 | if (sk_filter(sk, skb, 0)) | |
1228 | goto discard; | |
1229 | ||
1230 | /* | |
1231 | * socket locking is here for SMP purposes as backlog rcv | |
1232 | * is currently called with bh processing disabled. | |
1233 | */ | |
1234 | ||
1235 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1236 | ||
1237 | Yes, guys, it is the only place in our code, where we | |
1238 | may make it not affecting IPv4. | |
1239 | The rest of code is protocol independent, | |
1240 | and I do not like idea to uglify IPv4. | |
1241 | ||
1242 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1243 | looks not very well thought. For now we latch | |
1244 | options, received in the last packet, enqueued | |
1245 | by tcp. Feel free to propose better solution. | |
1246 | --ANK (980728) | |
1247 | */ | |
1248 | if (np->rxopt.all) | |
1249 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1250 | ||
1251 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1252 | TCP_CHECK_TIMER(sk); | |
1253 | if (tcp_rcv_established(sk, skb, skb->h.th, skb->len)) | |
1254 | goto reset; | |
1255 | TCP_CHECK_TIMER(sk); | |
1256 | if (opt_skb) | |
1257 | goto ipv6_pktoptions; | |
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | if (skb->len < (skb->h.th->doff<<2) || tcp_checksum_complete(skb)) | |
1262 | goto csum_err; | |
1263 | ||
1264 | if (sk->sk_state == TCP_LISTEN) { | |
1265 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); | |
1266 | if (!nsk) | |
1267 | goto discard; | |
1268 | ||
1269 | /* | |
1270 | * Queue it on the new socket if the new socket is active, | |
1271 | * otherwise we just shortcircuit this and continue with | |
1272 | * the new socket.. | |
1273 | */ | |
1274 | if(nsk != sk) { | |
1275 | if (tcp_child_process(sk, nsk, skb)) | |
1276 | goto reset; | |
1277 | if (opt_skb) | |
1278 | __kfree_skb(opt_skb); | |
1279 | return 0; | |
1280 | } | |
1281 | } | |
1282 | ||
1283 | TCP_CHECK_TIMER(sk); | |
1284 | if (tcp_rcv_state_process(sk, skb, skb->h.th, skb->len)) | |
1285 | goto reset; | |
1286 | TCP_CHECK_TIMER(sk); | |
1287 | if (opt_skb) | |
1288 | goto ipv6_pktoptions; | |
1289 | return 0; | |
1290 | ||
1291 | reset: | |
1292 | tcp_v6_send_reset(skb); | |
1293 | discard: | |
1294 | if (opt_skb) | |
1295 | __kfree_skb(opt_skb); | |
1296 | kfree_skb(skb); | |
1297 | return 0; | |
1298 | csum_err: | |
1299 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1300 | goto discard; | |
1301 | ||
1302 | ||
1303 | ipv6_pktoptions: | |
1304 | /* Do you ask, what is it? | |
1305 | ||
1306 | 1. skb was enqueued by tcp. | |
1307 | 2. skb is added to tail of read queue, rather than out of order. | |
1308 | 3. socket is not in passive state. | |
1309 | 4. Finally, it really contains options, which user wants to receive. | |
1310 | */ | |
1311 | tp = tcp_sk(sk); | |
1312 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1313 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1314 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1315 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1316 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
1da177e4 LT |
1317 | np->mcast_hops = opt_skb->nh.ipv6h->hop_limit; |
1318 | if (ipv6_opt_accepted(sk, opt_skb)) { | |
1319 | skb_set_owner_r(opt_skb, sk); | |
1320 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1321 | } else { | |
1322 | __kfree_skb(opt_skb); | |
1323 | opt_skb = xchg(&np->pktoptions, NULL); | |
1324 | } | |
1325 | } | |
1326 | ||
1327 | if (opt_skb) | |
1328 | kfree_skb(opt_skb); | |
1329 | return 0; | |
1330 | } | |
1331 | ||
1332 | static int tcp_v6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) | |
1333 | { | |
1334 | struct sk_buff *skb = *pskb; | |
1335 | struct tcphdr *th; | |
1336 | struct sock *sk; | |
1337 | int ret; | |
1338 | ||
1339 | if (skb->pkt_type != PACKET_HOST) | |
1340 | goto discard_it; | |
1341 | ||
1342 | /* | |
1343 | * Count it even if it's bad. | |
1344 | */ | |
1345 | TCP_INC_STATS_BH(TCP_MIB_INSEGS); | |
1346 | ||
1347 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1348 | goto discard_it; | |
1349 | ||
1350 | th = skb->h.th; | |
1351 | ||
1352 | if (th->doff < sizeof(struct tcphdr)/4) | |
1353 | goto bad_packet; | |
1354 | if (!pskb_may_pull(skb, th->doff*4)) | |
1355 | goto discard_it; | |
1356 | ||
1357 | if ((skb->ip_summed != CHECKSUM_UNNECESSARY && | |
fb286bb2 | 1358 | tcp_v6_checksum_init(skb))) |
1da177e4 LT |
1359 | goto bad_packet; |
1360 | ||
1361 | th = skb->h.th; | |
1362 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1363 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1364 | skb->len - th->doff*4); | |
1365 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1366 | TCP_SKB_CB(skb)->when = 0; | |
1367 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(skb->nh.ipv6h); | |
1368 | TCP_SKB_CB(skb)->sacked = 0; | |
1369 | ||
505cbfc5 ACM |
1370 | sk = __inet6_lookup(&tcp_hashinfo, &skb->nh.ipv6h->saddr, th->source, |
1371 | &skb->nh.ipv6h->daddr, ntohs(th->dest), | |
1372 | inet6_iif(skb)); | |
1da177e4 LT |
1373 | |
1374 | if (!sk) | |
1375 | goto no_tcp_socket; | |
1376 | ||
1377 | process: | |
1378 | if (sk->sk_state == TCP_TIME_WAIT) | |
1379 | goto do_time_wait; | |
1380 | ||
1381 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1382 | goto discard_and_relse; | |
1383 | ||
1384 | if (sk_filter(sk, skb, 0)) | |
1385 | goto discard_and_relse; | |
1386 | ||
1387 | skb->dev = NULL; | |
1388 | ||
1389 | bh_lock_sock(sk); | |
1390 | ret = 0; | |
1391 | if (!sock_owned_by_user(sk)) { | |
1392 | if (!tcp_prequeue(sk, skb)) | |
1393 | ret = tcp_v6_do_rcv(sk, skb); | |
1394 | } else | |
1395 | sk_add_backlog(sk, skb); | |
1396 | bh_unlock_sock(sk); | |
1397 | ||
1398 | sock_put(sk); | |
1399 | return ret ? -1 : 0; | |
1400 | ||
1401 | no_tcp_socket: | |
1402 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1403 | goto discard_it; | |
1404 | ||
1405 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1406 | bad_packet: | |
1407 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1408 | } else { | |
1409 | tcp_v6_send_reset(skb); | |
1410 | } | |
1411 | ||
1412 | discard_it: | |
1413 | ||
1414 | /* | |
1415 | * Discard frame | |
1416 | */ | |
1417 | ||
1418 | kfree_skb(skb); | |
1419 | return 0; | |
1420 | ||
1421 | discard_and_relse: | |
1422 | sock_put(sk); | |
1423 | goto discard_it; | |
1424 | ||
1425 | do_time_wait: | |
1426 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
8feaf0c0 | 1427 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
1428 | goto discard_it; |
1429 | } | |
1430 | ||
1431 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1432 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
8feaf0c0 | 1433 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
1434 | goto discard_it; |
1435 | } | |
1436 | ||
8feaf0c0 ACM |
1437 | switch (tcp_timewait_state_process((struct inet_timewait_sock *)sk, |
1438 | skb, th)) { | |
1da177e4 LT |
1439 | case TCP_TW_SYN: |
1440 | { | |
1441 | struct sock *sk2; | |
1442 | ||
505cbfc5 ACM |
1443 | sk2 = inet6_lookup_listener(&tcp_hashinfo, |
1444 | &skb->nh.ipv6h->daddr, | |
1445 | ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 | 1446 | if (sk2 != NULL) { |
295ff7ed ACM |
1447 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1448 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1449 | inet_twsk_put(tw); | |
1da177e4 LT |
1450 | sk = sk2; |
1451 | goto process; | |
1452 | } | |
1453 | /* Fall through to ACK */ | |
1454 | } | |
1455 | case TCP_TW_ACK: | |
1456 | tcp_v6_timewait_ack(sk, skb); | |
1457 | break; | |
1458 | case TCP_TW_RST: | |
1459 | goto no_tcp_socket; | |
1460 | case TCP_TW_SUCCESS:; | |
1461 | } | |
1462 | goto discard_it; | |
1463 | } | |
1464 | ||
1da177e4 LT |
1465 | static int tcp_v6_remember_stamp(struct sock *sk) |
1466 | { | |
1467 | /* Alas, not yet... */ | |
1468 | return 0; | |
1469 | } | |
1470 | ||
8292a17a | 1471 | static struct inet_connection_sock_af_ops ipv6_specific = { |
b9750ce1 | 1472 | .queue_xmit = inet6_csk_xmit, |
1da177e4 | 1473 | .send_check = tcp_v6_send_check, |
b9750ce1 | 1474 | .rebuild_header = inet6_sk_rebuild_header, |
1da177e4 LT |
1475 | .conn_request = tcp_v6_conn_request, |
1476 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1477 | .remember_stamp = tcp_v6_remember_stamp, | |
1478 | .net_header_len = sizeof(struct ipv6hdr), | |
1479 | ||
1480 | .setsockopt = ipv6_setsockopt, | |
1481 | .getsockopt = ipv6_getsockopt, | |
b9750ce1 | 1482 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
1da177e4 LT |
1483 | .sockaddr_len = sizeof(struct sockaddr_in6) |
1484 | }; | |
1485 | ||
1486 | /* | |
1487 | * TCP over IPv4 via INET6 API | |
1488 | */ | |
1489 | ||
8292a17a | 1490 | static struct inet_connection_sock_af_ops ipv6_mapped = { |
1da177e4 LT |
1491 | .queue_xmit = ip_queue_xmit, |
1492 | .send_check = tcp_v4_send_check, | |
32519f11 | 1493 | .rebuild_header = inet_sk_rebuild_header, |
1da177e4 LT |
1494 | .conn_request = tcp_v6_conn_request, |
1495 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1496 | .remember_stamp = tcp_v4_remember_stamp, | |
1497 | .net_header_len = sizeof(struct iphdr), | |
1498 | ||
1499 | .setsockopt = ipv6_setsockopt, | |
1500 | .getsockopt = ipv6_getsockopt, | |
b9750ce1 | 1501 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
1da177e4 LT |
1502 | .sockaddr_len = sizeof(struct sockaddr_in6) |
1503 | }; | |
1504 | ||
1505 | ||
1506 | ||
1507 | /* NOTE: A lot of things set to zero explicitly by call to | |
1508 | * sk_alloc() so need not be done here. | |
1509 | */ | |
1510 | static int tcp_v6_init_sock(struct sock *sk) | |
1511 | { | |
6687e988 | 1512 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1513 | struct tcp_sock *tp = tcp_sk(sk); |
1514 | ||
1515 | skb_queue_head_init(&tp->out_of_order_queue); | |
1516 | tcp_init_xmit_timers(sk); | |
1517 | tcp_prequeue_init(tp); | |
1518 | ||
6687e988 | 1519 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1520 | tp->mdev = TCP_TIMEOUT_INIT; |
1521 | ||
1522 | /* So many TCP implementations out there (incorrectly) count the | |
1523 | * initial SYN frame in their delayed-ACK and congestion control | |
1524 | * algorithms that we must have the following bandaid to talk | |
1525 | * efficiently to them. -DaveM | |
1526 | */ | |
1527 | tp->snd_cwnd = 2; | |
1528 | ||
1529 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1530 | * initialization of these values. | |
1531 | */ | |
1532 | tp->snd_ssthresh = 0x7fffffff; | |
1533 | tp->snd_cwnd_clamp = ~0; | |
c1b4a7e6 | 1534 | tp->mss_cache = 536; |
1da177e4 LT |
1535 | |
1536 | tp->reordering = sysctl_tcp_reordering; | |
1537 | ||
1538 | sk->sk_state = TCP_CLOSE; | |
1539 | ||
8292a17a | 1540 | icsk->icsk_af_ops = &ipv6_specific; |
6687e988 | 1541 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
1da177e4 LT |
1542 | sk->sk_write_space = sk_stream_write_space; |
1543 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1544 | ||
1545 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; | |
1546 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1547 | ||
1548 | atomic_inc(&tcp_sockets_allocated); | |
1549 | ||
1550 | return 0; | |
1551 | } | |
1552 | ||
1553 | static int tcp_v6_destroy_sock(struct sock *sk) | |
1554 | { | |
1da177e4 LT |
1555 | tcp_v4_destroy_sock(sk); |
1556 | return inet6_destroy_sock(sk); | |
1557 | } | |
1558 | ||
1559 | /* Proc filesystem TCPv6 sock list dumping. */ | |
1560 | static void get_openreq6(struct seq_file *seq, | |
60236fdd | 1561 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 1562 | { |
1da177e4 | 1563 | int ttd = req->expires - jiffies; |
ca304b61 ACM |
1564 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1565 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1566 | |
1567 | if (ttd < 0) | |
1568 | ttd = 0; | |
1569 | ||
1da177e4 LT |
1570 | seq_printf(seq, |
1571 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1572 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1573 | i, | |
1574 | src->s6_addr32[0], src->s6_addr32[1], | |
1575 | src->s6_addr32[2], src->s6_addr32[3], | |
1576 | ntohs(inet_sk(sk)->sport), | |
1577 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1578 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1579 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1580 | TCP_SYN_RECV, |
1581 | 0,0, /* could print option size, but that is af dependent. */ | |
1582 | 1, /* timers active (only the expire timer) */ | |
1583 | jiffies_to_clock_t(ttd), | |
1584 | req->retrans, | |
1585 | uid, | |
1586 | 0, /* non standard timer */ | |
1587 | 0, /* open_requests have no inode */ | |
1588 | 0, req); | |
1589 | } | |
1590 | ||
1591 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1592 | { | |
1593 | struct in6_addr *dest, *src; | |
1594 | __u16 destp, srcp; | |
1595 | int timer_active; | |
1596 | unsigned long timer_expires; | |
1597 | struct inet_sock *inet = inet_sk(sp); | |
1598 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1599 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
1600 | struct ipv6_pinfo *np = inet6_sk(sp); |
1601 | ||
1602 | dest = &np->daddr; | |
1603 | src = &np->rcv_saddr; | |
1604 | destp = ntohs(inet->dport); | |
1605 | srcp = ntohs(inet->sport); | |
463c84b9 ACM |
1606 | |
1607 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1608 | timer_active = 1; |
463c84b9 ACM |
1609 | timer_expires = icsk->icsk_timeout; |
1610 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1611 | timer_active = 4; |
463c84b9 | 1612 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1613 | } else if (timer_pending(&sp->sk_timer)) { |
1614 | timer_active = 2; | |
1615 | timer_expires = sp->sk_timer.expires; | |
1616 | } else { | |
1617 | timer_active = 0; | |
1618 | timer_expires = jiffies; | |
1619 | } | |
1620 | ||
1621 | seq_printf(seq, | |
1622 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1623 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n", | |
1624 | i, | |
1625 | src->s6_addr32[0], src->s6_addr32[1], | |
1626 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1627 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1628 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1629 | sp->sk_state, | |
1630 | tp->write_seq-tp->snd_una, tp->rcv_nxt-tp->copied_seq, | |
1631 | timer_active, | |
1632 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 1633 | icsk->icsk_retransmits, |
1da177e4 | 1634 | sock_i_uid(sp), |
6687e988 | 1635 | icsk->icsk_probes_out, |
1da177e4 LT |
1636 | sock_i_ino(sp), |
1637 | atomic_read(&sp->sk_refcnt), sp, | |
463c84b9 ACM |
1638 | icsk->icsk_rto, |
1639 | icsk->icsk_ack.ato, | |
1640 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, | |
1da177e4 LT |
1641 | tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh |
1642 | ); | |
1643 | } | |
1644 | ||
1645 | static void get_timewait6_sock(struct seq_file *seq, | |
8feaf0c0 | 1646 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
1647 | { |
1648 | struct in6_addr *dest, *src; | |
1649 | __u16 destp, srcp; | |
0fa1a53e | 1650 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
1651 | int ttd = tw->tw_ttd - jiffies; |
1652 | ||
1653 | if (ttd < 0) | |
1654 | ttd = 0; | |
1655 | ||
0fa1a53e ACM |
1656 | dest = &tw6->tw_v6_daddr; |
1657 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
1658 | destp = ntohs(tw->tw_dport); |
1659 | srcp = ntohs(tw->tw_sport); | |
1660 | ||
1661 | seq_printf(seq, | |
1662 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1663 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1664 | i, | |
1665 | src->s6_addr32[0], src->s6_addr32[1], | |
1666 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1667 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1668 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1669 | tw->tw_substate, 0, 0, | |
1670 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
1671 | atomic_read(&tw->tw_refcnt), tw); | |
1672 | } | |
1673 | ||
1674 | #ifdef CONFIG_PROC_FS | |
1675 | static int tcp6_seq_show(struct seq_file *seq, void *v) | |
1676 | { | |
1677 | struct tcp_iter_state *st; | |
1678 | ||
1679 | if (v == SEQ_START_TOKEN) { | |
1680 | seq_puts(seq, | |
1681 | " sl " | |
1682 | "local_address " | |
1683 | "remote_address " | |
1684 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1685 | " uid timeout inode\n"); | |
1686 | goto out; | |
1687 | } | |
1688 | st = seq->private; | |
1689 | ||
1690 | switch (st->state) { | |
1691 | case TCP_SEQ_STATE_LISTENING: | |
1692 | case TCP_SEQ_STATE_ESTABLISHED: | |
1693 | get_tcp6_sock(seq, v, st->num); | |
1694 | break; | |
1695 | case TCP_SEQ_STATE_OPENREQ: | |
1696 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
1697 | break; | |
1698 | case TCP_SEQ_STATE_TIME_WAIT: | |
1699 | get_timewait6_sock(seq, v, st->num); | |
1700 | break; | |
1701 | } | |
1702 | out: | |
1703 | return 0; | |
1704 | } | |
1705 | ||
1706 | static struct file_operations tcp6_seq_fops; | |
1707 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { | |
1708 | .owner = THIS_MODULE, | |
1709 | .name = "tcp6", | |
1710 | .family = AF_INET6, | |
1711 | .seq_show = tcp6_seq_show, | |
1712 | .seq_fops = &tcp6_seq_fops, | |
1713 | }; | |
1714 | ||
1715 | int __init tcp6_proc_init(void) | |
1716 | { | |
1717 | return tcp_proc_register(&tcp6_seq_afinfo); | |
1718 | } | |
1719 | ||
1720 | void tcp6_proc_exit(void) | |
1721 | { | |
1722 | tcp_proc_unregister(&tcp6_seq_afinfo); | |
1723 | } | |
1724 | #endif | |
1725 | ||
1726 | struct proto tcpv6_prot = { | |
1727 | .name = "TCPv6", | |
1728 | .owner = THIS_MODULE, | |
1729 | .close = tcp_close, | |
1730 | .connect = tcp_v6_connect, | |
1731 | .disconnect = tcp_disconnect, | |
463c84b9 | 1732 | .accept = inet_csk_accept, |
1da177e4 LT |
1733 | .ioctl = tcp_ioctl, |
1734 | .init = tcp_v6_init_sock, | |
1735 | .destroy = tcp_v6_destroy_sock, | |
1736 | .shutdown = tcp_shutdown, | |
1737 | .setsockopt = tcp_setsockopt, | |
1738 | .getsockopt = tcp_getsockopt, | |
1739 | .sendmsg = tcp_sendmsg, | |
1740 | .recvmsg = tcp_recvmsg, | |
1741 | .backlog_rcv = tcp_v6_do_rcv, | |
1742 | .hash = tcp_v6_hash, | |
1743 | .unhash = tcp_unhash, | |
1744 | .get_port = tcp_v6_get_port, | |
1745 | .enter_memory_pressure = tcp_enter_memory_pressure, | |
1746 | .sockets_allocated = &tcp_sockets_allocated, | |
1747 | .memory_allocated = &tcp_memory_allocated, | |
1748 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1749 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
1750 | .sysctl_mem = sysctl_tcp_mem, |
1751 | .sysctl_wmem = sysctl_tcp_wmem, | |
1752 | .sysctl_rmem = sysctl_tcp_rmem, | |
1753 | .max_header = MAX_TCP_HEADER, | |
1754 | .obj_size = sizeof(struct tcp6_sock), | |
8feaf0c0 | 1755 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), |
60236fdd | 1756 | .rsk_prot = &tcp6_request_sock_ops, |
1da177e4 LT |
1757 | }; |
1758 | ||
1759 | static struct inet6_protocol tcpv6_protocol = { | |
1760 | .handler = tcp_v6_rcv, | |
1761 | .err_handler = tcp_v6_err, | |
1762 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1763 | }; | |
1764 | ||
1da177e4 LT |
1765 | static struct inet_protosw tcpv6_protosw = { |
1766 | .type = SOCK_STREAM, | |
1767 | .protocol = IPPROTO_TCP, | |
1768 | .prot = &tcpv6_prot, | |
1769 | .ops = &inet6_stream_ops, | |
1770 | .capability = -1, | |
1771 | .no_check = 0, | |
1772 | .flags = INET_PROTOSW_PERMANENT, | |
1773 | }; | |
1774 | ||
1775 | void __init tcpv6_init(void) | |
1776 | { | |
1777 | /* register inet6 protocol */ | |
1778 | if (inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP) < 0) | |
1779 | printk(KERN_ERR "tcpv6_init: Could not register protocol\n"); | |
1780 | inet6_register_protosw(&tcpv6_protosw); | |
1781 | } |