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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); |
1da177e4 LT |
71 | static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len, |
72 | struct sk_buff *skb); | |
73 | ||
74 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
75 | static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok); | |
76 | ||
77 | static struct tcp_func ipv6_mapped; | |
78 | static struct tcp_func ipv6_specific; | |
79 | ||
971af18b ACM |
80 | int inet6_csk_bind_conflict(const struct sock *sk, |
81 | const struct inet_bind_bucket *tb) | |
1da177e4 | 82 | { |
0f7ff927 ACM |
83 | const struct sock *sk2; |
84 | const struct hlist_node *node; | |
1da177e4 LT |
85 | |
86 | /* We must walk the whole port owner list in this case. -DaveM */ | |
87 | sk_for_each_bound(sk2, node, &tb->owners) { | |
88 | if (sk != sk2 && | |
89 | (!sk->sk_bound_dev_if || | |
90 | !sk2->sk_bound_dev_if || | |
91 | sk->sk_bound_dev_if == sk2->sk_bound_dev_if) && | |
92 | (!sk->sk_reuse || !sk2->sk_reuse || | |
93 | sk2->sk_state == TCP_LISTEN) && | |
94 | ipv6_rcv_saddr_equal(sk, sk2)) | |
95 | break; | |
96 | } | |
97 | ||
98 | return node != NULL; | |
99 | } | |
100 | ||
1da177e4 LT |
101 | static int tcp_v6_get_port(struct sock *sk, unsigned short snum) |
102 | { | |
971af18b ACM |
103 | return inet_csk_get_port(&tcp_hashinfo, sk, snum, |
104 | inet6_csk_bind_conflict); | |
1da177e4 LT |
105 | } |
106 | ||
1da177e4 LT |
107 | static void tcp_v6_hash(struct sock *sk) |
108 | { | |
109 | if (sk->sk_state != TCP_CLOSE) { | |
110 | struct tcp_sock *tp = tcp_sk(sk); | |
111 | ||
112 | if (tp->af_specific == &ipv6_mapped) { | |
113 | tcp_prot.hash(sk); | |
114 | return; | |
115 | } | |
116 | local_bh_disable(); | |
90b19d31 | 117 | __inet6_hash(&tcp_hashinfo, sk); |
1da177e4 LT |
118 | local_bh_enable(); |
119 | } | |
120 | } | |
121 | ||
1da177e4 LT |
122 | static __inline__ u16 tcp_v6_check(struct tcphdr *th, int len, |
123 | struct in6_addr *saddr, | |
124 | struct in6_addr *daddr, | |
125 | unsigned long base) | |
126 | { | |
127 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
128 | } | |
129 | ||
130 | static __u32 tcp_v6_init_sequence(struct sock *sk, struct sk_buff *skb) | |
131 | { | |
132 | if (skb->protocol == htons(ETH_P_IPV6)) { | |
133 | return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32, | |
134 | skb->nh.ipv6h->saddr.s6_addr32, | |
135 | skb->h.th->dest, | |
136 | skb->h.th->source); | |
137 | } else { | |
138 | return secure_tcp_sequence_number(skb->nh.iph->daddr, | |
139 | skb->nh.iph->saddr, | |
140 | skb->h.th->dest, | |
141 | skb->h.th->source); | |
142 | } | |
143 | } | |
144 | ||
505cbfc5 | 145 | static int __tcp_v6_check_established(struct sock *sk, const __u16 lport, |
8feaf0c0 | 146 | struct inet_timewait_sock **twp) |
1da177e4 LT |
147 | { |
148 | struct inet_sock *inet = inet_sk(sk); | |
505cbfc5 ACM |
149 | const struct ipv6_pinfo *np = inet6_sk(sk); |
150 | const struct in6_addr *daddr = &np->rcv_saddr; | |
151 | const struct in6_addr *saddr = &np->daddr; | |
152 | const int dif = sk->sk_bound_dev_if; | |
8feaf0c0 | 153 | const u32 ports = INET_COMBINED_PORTS(inet->dport, lport); |
81c3d547 ED |
154 | unsigned int hash = inet6_ehashfn(daddr, inet->num, saddr, inet->dport); |
155 | struct inet_ehash_bucket *head = inet_ehash_bucket(&tcp_hashinfo, hash); | |
1da177e4 | 156 | struct sock *sk2; |
8feaf0c0 ACM |
157 | const struct hlist_node *node; |
158 | struct inet_timewait_sock *tw; | |
1da177e4 | 159 | |
81c3d547 | 160 | prefetch(head->chain.first); |
1da177e4 LT |
161 | write_lock(&head->lock); |
162 | ||
163 | /* Check TIME-WAIT sockets first. */ | |
6e04e021 | 164 | sk_for_each(sk2, node, &(head + tcp_hashinfo.ehash_size)->chain) { |
8feaf0c0 ACM |
165 | const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk2); |
166 | ||
167 | tw = inet_twsk(sk2); | |
1da177e4 LT |
168 | |
169 | if(*((__u32 *)&(tw->tw_dport)) == ports && | |
170 | sk2->sk_family == PF_INET6 && | |
8feaf0c0 ACM |
171 | ipv6_addr_equal(&tcp6tw->tw_v6_daddr, saddr) && |
172 | ipv6_addr_equal(&tcp6tw->tw_v6_rcv_saddr, daddr) && | |
1da177e4 | 173 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) { |
8feaf0c0 | 174 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sk2); |
1da177e4 LT |
175 | struct tcp_sock *tp = tcp_sk(sk); |
176 | ||
8feaf0c0 ACM |
177 | if (tcptw->tw_ts_recent_stamp && |
178 | (!twp || | |
179 | (sysctl_tcp_tw_reuse && | |
180 | xtime.tv_sec - tcptw->tw_ts_recent_stamp > 1))) { | |
1da177e4 | 181 | /* See comment in tcp_ipv4.c */ |
8feaf0c0 | 182 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; |
1da177e4 LT |
183 | if (!tp->write_seq) |
184 | tp->write_seq = 1; | |
8feaf0c0 ACM |
185 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; |
186 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; | |
1da177e4 LT |
187 | sock_hold(sk2); |
188 | goto unique; | |
189 | } else | |
190 | goto not_unique; | |
191 | } | |
192 | } | |
193 | tw = NULL; | |
194 | ||
195 | /* And established part... */ | |
196 | sk_for_each(sk2, node, &head->chain) { | |
81c3d547 | 197 | if (INET6_MATCH(sk2, hash, saddr, daddr, ports, dif)) |
1da177e4 LT |
198 | goto not_unique; |
199 | } | |
200 | ||
201 | unique: | |
202 | BUG_TRAP(sk_unhashed(sk)); | |
203 | __sk_add_node(sk, &head->chain); | |
81c3d547 | 204 | sk->sk_hash = hash; |
1da177e4 LT |
205 | sock_prot_inc_use(sk->sk_prot); |
206 | write_unlock(&head->lock); | |
207 | ||
208 | if (twp) { | |
209 | *twp = tw; | |
210 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); | |
211 | } else if (tw) { | |
212 | /* Silly. Should hash-dance instead... */ | |
295ff7ed | 213 | inet_twsk_deschedule(tw, &tcp_death_row); |
1da177e4 LT |
214 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); |
215 | ||
8feaf0c0 | 216 | inet_twsk_put(tw); |
1da177e4 LT |
217 | } |
218 | return 0; | |
219 | ||
220 | not_unique: | |
221 | write_unlock(&head->lock); | |
222 | return -EADDRNOTAVAIL; | |
223 | } | |
224 | ||
225 | static inline u32 tcpv6_port_offset(const struct sock *sk) | |
226 | { | |
227 | const struct inet_sock *inet = inet_sk(sk); | |
228 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
229 | ||
230 | return secure_tcpv6_port_ephemeral(np->rcv_saddr.s6_addr32, | |
231 | np->daddr.s6_addr32, | |
232 | inet->dport); | |
233 | } | |
234 | ||
235 | static int tcp_v6_hash_connect(struct sock *sk) | |
236 | { | |
237 | unsigned short snum = inet_sk(sk)->num; | |
0f7ff927 ACM |
238 | struct inet_bind_hashbucket *head; |
239 | struct inet_bind_bucket *tb; | |
1da177e4 LT |
240 | int ret; |
241 | ||
242 | if (!snum) { | |
243 | int low = sysctl_local_port_range[0]; | |
244 | int high = sysctl_local_port_range[1]; | |
245 | int range = high - low; | |
246 | int i; | |
247 | int port; | |
248 | static u32 hint; | |
249 | u32 offset = hint + tcpv6_port_offset(sk); | |
250 | struct hlist_node *node; | |
8feaf0c0 | 251 | struct inet_timewait_sock *tw = NULL; |
1da177e4 LT |
252 | |
253 | local_bh_disable(); | |
254 | for (i = 1; i <= range; i++) { | |
255 | port = low + (i + offset) % range; | |
6e04e021 | 256 | head = &tcp_hashinfo.bhash[inet_bhashfn(port, tcp_hashinfo.bhash_size)]; |
1da177e4 LT |
257 | spin_lock(&head->lock); |
258 | ||
259 | /* Does not bother with rcv_saddr checks, | |
260 | * because the established check is already | |
261 | * unique enough. | |
262 | */ | |
0f7ff927 | 263 | inet_bind_bucket_for_each(tb, node, &head->chain) { |
1da177e4 LT |
264 | if (tb->port == port) { |
265 | BUG_TRAP(!hlist_empty(&tb->owners)); | |
266 | if (tb->fastreuse >= 0) | |
267 | goto next_port; | |
268 | if (!__tcp_v6_check_established(sk, | |
269 | port, | |
270 | &tw)) | |
271 | goto ok; | |
272 | goto next_port; | |
273 | } | |
274 | } | |
275 | ||
6e04e021 | 276 | tb = inet_bind_bucket_create(tcp_hashinfo.bind_bucket_cachep, head, port); |
1da177e4 LT |
277 | if (!tb) { |
278 | spin_unlock(&head->lock); | |
279 | break; | |
280 | } | |
281 | tb->fastreuse = -1; | |
282 | goto ok; | |
283 | ||
284 | next_port: | |
285 | spin_unlock(&head->lock); | |
286 | } | |
287 | local_bh_enable(); | |
288 | ||
289 | return -EADDRNOTAVAIL; | |
290 | ||
291 | ok: | |
292 | hint += i; | |
293 | ||
294 | /* Head lock still held and bh's disabled */ | |
2d8c4ce5 | 295 | inet_bind_hash(sk, tb, port); |
1da177e4 LT |
296 | if (sk_unhashed(sk)) { |
297 | inet_sk(sk)->sport = htons(port); | |
90b19d31 | 298 | __inet6_hash(&tcp_hashinfo, sk); |
1da177e4 LT |
299 | } |
300 | spin_unlock(&head->lock); | |
301 | ||
302 | if (tw) { | |
295ff7ed | 303 | inet_twsk_deschedule(tw, &tcp_death_row); |
8feaf0c0 | 304 | inet_twsk_put(tw); |
1da177e4 LT |
305 | } |
306 | ||
307 | ret = 0; | |
308 | goto out; | |
309 | } | |
310 | ||
6e04e021 | 311 | head = &tcp_hashinfo.bhash[inet_bhashfn(snum, tcp_hashinfo.bhash_size)]; |
463c84b9 | 312 | tb = inet_csk(sk)->icsk_bind_hash; |
1da177e4 LT |
313 | spin_lock_bh(&head->lock); |
314 | ||
315 | if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) { | |
90b19d31 | 316 | __inet6_hash(&tcp_hashinfo, sk); |
1da177e4 LT |
317 | spin_unlock_bh(&head->lock); |
318 | return 0; | |
319 | } else { | |
320 | spin_unlock(&head->lock); | |
321 | /* No definite answer... Walk to established hash table */ | |
322 | ret = __tcp_v6_check_established(sk, snum, NULL); | |
323 | out: | |
324 | local_bh_enable(); | |
325 | return ret; | |
326 | } | |
327 | } | |
328 | ||
1da177e4 LT |
329 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
330 | int addr_len) | |
331 | { | |
332 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
333 | struct inet_sock *inet = inet_sk(sk); | |
334 | struct ipv6_pinfo *np = inet6_sk(sk); | |
335 | struct tcp_sock *tp = tcp_sk(sk); | |
336 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
337 | struct flowi fl; | |
338 | struct dst_entry *dst; | |
339 | int addr_type; | |
340 | int err; | |
341 | ||
342 | if (addr_len < SIN6_LEN_RFC2133) | |
343 | return -EINVAL; | |
344 | ||
345 | if (usin->sin6_family != AF_INET6) | |
346 | return(-EAFNOSUPPORT); | |
347 | ||
348 | memset(&fl, 0, sizeof(fl)); | |
349 | ||
350 | if (np->sndflow) { | |
351 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
352 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
353 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
354 | struct ip6_flowlabel *flowlabel; | |
355 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
356 | if (flowlabel == NULL) | |
357 | return -EINVAL; | |
358 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
359 | fl6_sock_release(flowlabel); | |
360 | } | |
361 | } | |
362 | ||
363 | /* | |
364 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
365 | */ | |
366 | ||
367 | if(ipv6_addr_any(&usin->sin6_addr)) | |
368 | usin->sin6_addr.s6_addr[15] = 0x1; | |
369 | ||
370 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
371 | ||
372 | if(addr_type & IPV6_ADDR_MULTICAST) | |
373 | return -ENETUNREACH; | |
374 | ||
375 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
376 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
377 | usin->sin6_scope_id) { | |
378 | /* If interface is set while binding, indices | |
379 | * must coincide. | |
380 | */ | |
381 | if (sk->sk_bound_dev_if && | |
382 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
383 | return -EINVAL; | |
384 | ||
385 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
386 | } | |
387 | ||
388 | /* Connect to link-local address requires an interface */ | |
389 | if (!sk->sk_bound_dev_if) | |
390 | return -EINVAL; | |
391 | } | |
392 | ||
393 | if (tp->rx_opt.ts_recent_stamp && | |
394 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
395 | tp->rx_opt.ts_recent = 0; | |
396 | tp->rx_opt.ts_recent_stamp = 0; | |
397 | tp->write_seq = 0; | |
398 | } | |
399 | ||
400 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
401 | np->flow_label = fl.fl6_flowlabel; | |
402 | ||
403 | /* | |
404 | * TCP over IPv4 | |
405 | */ | |
406 | ||
407 | if (addr_type == IPV6_ADDR_MAPPED) { | |
408 | u32 exthdrlen = tp->ext_header_len; | |
409 | struct sockaddr_in sin; | |
410 | ||
411 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
412 | ||
413 | if (__ipv6_only_sock(sk)) | |
414 | return -ENETUNREACH; | |
415 | ||
416 | sin.sin_family = AF_INET; | |
417 | sin.sin_port = usin->sin6_port; | |
418 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
419 | ||
420 | tp->af_specific = &ipv6_mapped; | |
421 | sk->sk_backlog_rcv = tcp_v4_do_rcv; | |
422 | ||
423 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
424 | ||
425 | if (err) { | |
426 | tp->ext_header_len = exthdrlen; | |
427 | tp->af_specific = &ipv6_specific; | |
428 | sk->sk_backlog_rcv = tcp_v6_do_rcv; | |
429 | goto failure; | |
430 | } else { | |
431 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
432 | inet->saddr); | |
433 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
434 | inet->rcv_saddr); | |
435 | } | |
436 | ||
437 | return err; | |
438 | } | |
439 | ||
440 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
441 | saddr = &np->rcv_saddr; | |
442 | ||
443 | fl.proto = IPPROTO_TCP; | |
444 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
445 | ipv6_addr_copy(&fl.fl6_src, | |
446 | (saddr ? saddr : &np->saddr)); | |
447 | fl.oif = sk->sk_bound_dev_if; | |
448 | fl.fl_ip_dport = usin->sin6_port; | |
449 | fl.fl_ip_sport = inet->sport; | |
450 | ||
451 | if (np->opt && np->opt->srcrt) { | |
452 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
453 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
454 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
455 | final_p = &final; | |
456 | } | |
457 | ||
458 | err = ip6_dst_lookup(sk, &dst, &fl); | |
459 | if (err) | |
460 | goto failure; | |
461 | if (final_p) | |
462 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
463 | ||
e104411b | 464 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
1da177e4 | 465 | goto failure; |
1da177e4 LT |
466 | |
467 | if (saddr == NULL) { | |
468 | saddr = &fl.fl6_src; | |
469 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
470 | } | |
471 | ||
472 | /* set the source address */ | |
473 | ipv6_addr_copy(&np->saddr, saddr); | |
474 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
475 | ||
476 | ip6_dst_store(sk, dst, NULL); | |
477 | sk->sk_route_caps = dst->dev->features & | |
478 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
479 | ||
480 | tp->ext_header_len = 0; | |
481 | if (np->opt) | |
482 | tp->ext_header_len = np->opt->opt_flen + np->opt->opt_nflen; | |
483 | ||
484 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
485 | ||
486 | inet->dport = usin->sin6_port; | |
487 | ||
488 | tcp_set_state(sk, TCP_SYN_SENT); | |
489 | err = tcp_v6_hash_connect(sk); | |
490 | if (err) | |
491 | goto late_failure; | |
492 | ||
493 | if (!tp->write_seq) | |
494 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
495 | np->daddr.s6_addr32, | |
496 | inet->sport, | |
497 | inet->dport); | |
498 | ||
499 | err = tcp_connect(sk); | |
500 | if (err) | |
501 | goto late_failure; | |
502 | ||
503 | return 0; | |
504 | ||
505 | late_failure: | |
506 | tcp_set_state(sk, TCP_CLOSE); | |
507 | __sk_dst_reset(sk); | |
508 | failure: | |
509 | inet->dport = 0; | |
510 | sk->sk_route_caps = 0; | |
511 | return err; | |
512 | } | |
513 | ||
514 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
515 | int type, int code, int offset, __u32 info) | |
516 | { | |
517 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
505cbfc5 | 518 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
519 | struct ipv6_pinfo *np; |
520 | struct sock *sk; | |
521 | int err; | |
522 | struct tcp_sock *tp; | |
523 | __u32 seq; | |
524 | ||
505cbfc5 ACM |
525 | sk = inet6_lookup(&tcp_hashinfo, &hdr->daddr, th->dest, &hdr->saddr, |
526 | th->source, skb->dev->ifindex); | |
1da177e4 LT |
527 | |
528 | if (sk == NULL) { | |
529 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
530 | return; | |
531 | } | |
532 | ||
533 | if (sk->sk_state == TCP_TIME_WAIT) { | |
8feaf0c0 | 534 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
535 | return; |
536 | } | |
537 | ||
538 | bh_lock_sock(sk); | |
539 | if (sock_owned_by_user(sk)) | |
540 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
541 | ||
542 | if (sk->sk_state == TCP_CLOSE) | |
543 | goto out; | |
544 | ||
545 | tp = tcp_sk(sk); | |
546 | seq = ntohl(th->seq); | |
547 | if (sk->sk_state != TCP_LISTEN && | |
548 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
549 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
550 | goto out; | |
551 | } | |
552 | ||
553 | np = inet6_sk(sk); | |
554 | ||
555 | if (type == ICMPV6_PKT_TOOBIG) { | |
556 | struct dst_entry *dst = NULL; | |
557 | ||
558 | if (sock_owned_by_user(sk)) | |
559 | goto out; | |
560 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
561 | goto out; | |
562 | ||
563 | /* icmp should have updated the destination cache entry */ | |
564 | dst = __sk_dst_check(sk, np->dst_cookie); | |
565 | ||
566 | if (dst == NULL) { | |
567 | struct inet_sock *inet = inet_sk(sk); | |
568 | struct flowi fl; | |
569 | ||
570 | /* BUGGG_FUTURE: Again, it is not clear how | |
571 | to handle rthdr case. Ignore this complexity | |
572 | for now. | |
573 | */ | |
574 | memset(&fl, 0, sizeof(fl)); | |
575 | fl.proto = IPPROTO_TCP; | |
576 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
577 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
578 | fl.oif = sk->sk_bound_dev_if; | |
579 | fl.fl_ip_dport = inet->dport; | |
580 | fl.fl_ip_sport = inet->sport; | |
581 | ||
582 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
583 | sk->sk_err_soft = -err; | |
584 | goto out; | |
585 | } | |
586 | ||
587 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
588 | sk->sk_err_soft = -err; | |
589 | goto out; | |
590 | } | |
591 | ||
592 | } else | |
593 | dst_hold(dst); | |
594 | ||
595 | if (tp->pmtu_cookie > dst_mtu(dst)) { | |
596 | tcp_sync_mss(sk, dst_mtu(dst)); | |
597 | tcp_simple_retransmit(sk); | |
598 | } /* else let the usual retransmit timer handle it */ | |
599 | dst_release(dst); | |
600 | goto out; | |
601 | } | |
602 | ||
603 | icmpv6_err_convert(type, code, &err); | |
604 | ||
60236fdd | 605 | /* Might be for an request_sock */ |
1da177e4 | 606 | switch (sk->sk_state) { |
60236fdd | 607 | struct request_sock *req, **prev; |
1da177e4 LT |
608 | case TCP_LISTEN: |
609 | if (sock_owned_by_user(sk)) | |
610 | goto out; | |
611 | ||
8129765a ACM |
612 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
613 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
614 | if (!req) |
615 | goto out; | |
616 | ||
617 | /* ICMPs are not backlogged, hence we cannot get | |
618 | * an established socket here. | |
619 | */ | |
620 | BUG_TRAP(req->sk == NULL); | |
621 | ||
2e6599cb | 622 | if (seq != tcp_rsk(req)->snt_isn) { |
1da177e4 LT |
623 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
624 | goto out; | |
625 | } | |
626 | ||
463c84b9 | 627 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
628 | goto out; |
629 | ||
630 | case TCP_SYN_SENT: | |
631 | case TCP_SYN_RECV: /* Cannot happen. | |
632 | It can, it SYNs are crossed. --ANK */ | |
633 | if (!sock_owned_by_user(sk)) { | |
634 | TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS); | |
635 | sk->sk_err = err; | |
636 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
637 | ||
638 | tcp_done(sk); | |
639 | } else | |
640 | sk->sk_err_soft = err; | |
641 | goto out; | |
642 | } | |
643 | ||
644 | if (!sock_owned_by_user(sk) && np->recverr) { | |
645 | sk->sk_err = err; | |
646 | sk->sk_error_report(sk); | |
647 | } else | |
648 | sk->sk_err_soft = err; | |
649 | ||
650 | out: | |
651 | bh_unlock_sock(sk); | |
652 | sock_put(sk); | |
653 | } | |
654 | ||
655 | ||
60236fdd | 656 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, |
1da177e4 LT |
657 | struct dst_entry *dst) |
658 | { | |
2e6599cb | 659 | struct tcp6_request_sock *treq = tcp6_rsk(req); |
1da177e4 LT |
660 | struct ipv6_pinfo *np = inet6_sk(sk); |
661 | struct sk_buff * skb; | |
662 | struct ipv6_txoptions *opt = NULL; | |
663 | struct in6_addr * final_p = NULL, final; | |
664 | struct flowi fl; | |
665 | int err = -1; | |
666 | ||
667 | memset(&fl, 0, sizeof(fl)); | |
668 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
669 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
670 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 671 | fl.fl6_flowlabel = 0; |
2e6599cb ACM |
672 | fl.oif = treq->iif; |
673 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
1da177e4 LT |
674 | fl.fl_ip_sport = inet_sk(sk)->sport; |
675 | ||
676 | if (dst == NULL) { | |
677 | opt = np->opt; | |
678 | if (opt == NULL && | |
333fad53 | 679 | np->rxopt.bits.osrcrt == 2 && |
2e6599cb ACM |
680 | treq->pktopts) { |
681 | struct sk_buff *pktopts = treq->pktopts; | |
1da177e4 LT |
682 | struct inet6_skb_parm *rxopt = IP6CB(pktopts); |
683 | if (rxopt->srcrt) | |
684 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr*)(pktopts->nh.raw + rxopt->srcrt)); | |
685 | } | |
686 | ||
687 | if (opt && opt->srcrt) { | |
688 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
689 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
690 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
691 | final_p = &final; | |
692 | } | |
693 | ||
694 | err = ip6_dst_lookup(sk, &dst, &fl); | |
695 | if (err) | |
696 | goto done; | |
697 | if (final_p) | |
698 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
699 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
700 | goto done; | |
701 | } | |
702 | ||
703 | skb = tcp_make_synack(sk, dst, req); | |
704 | if (skb) { | |
705 | struct tcphdr *th = skb->h.th; | |
706 | ||
707 | th->check = tcp_v6_check(th, skb->len, | |
2e6599cb | 708 | &treq->loc_addr, &treq->rmt_addr, |
1da177e4 LT |
709 | csum_partial((char *)th, skb->len, skb->csum)); |
710 | ||
2e6599cb | 711 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
712 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
713 | if (err == NET_XMIT_CN) | |
714 | err = 0; | |
715 | } | |
716 | ||
717 | done: | |
1da177e4 LT |
718 | if (opt && opt != np->opt) |
719 | sock_kfree_s(sk, opt, opt->tot_len); | |
720 | return err; | |
721 | } | |
722 | ||
60236fdd | 723 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 724 | { |
2e6599cb ACM |
725 | if (tcp6_rsk(req)->pktopts) |
726 | kfree_skb(tcp6_rsk(req)->pktopts); | |
1da177e4 LT |
727 | } |
728 | ||
60236fdd | 729 | static struct request_sock_ops tcp6_request_sock_ops = { |
1da177e4 | 730 | .family = AF_INET6, |
2e6599cb | 731 | .obj_size = sizeof(struct tcp6_request_sock), |
1da177e4 | 732 | .rtx_syn_ack = tcp_v6_send_synack, |
60236fdd ACM |
733 | .send_ack = tcp_v6_reqsk_send_ack, |
734 | .destructor = tcp_v6_reqsk_destructor, | |
1da177e4 LT |
735 | .send_reset = tcp_v6_send_reset |
736 | }; | |
737 | ||
738 | static int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) | |
739 | { | |
740 | struct ipv6_pinfo *np = inet6_sk(sk); | |
741 | struct inet6_skb_parm *opt = IP6CB(skb); | |
742 | ||
743 | if (np->rxopt.all) { | |
333fad53 YH |
744 | if ((opt->hop && (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || |
745 | ((IPV6_FLOWINFO_MASK & *(u32*)skb->nh.raw) && np->rxopt.bits.rxflow) || | |
746 | (opt->srcrt && (np->rxopt.bits.srcrt || np->rxopt.bits.osrcrt)) || | |
747 | ((opt->dst1 || opt->dst0) && (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) | |
1da177e4 LT |
748 | return 1; |
749 | } | |
750 | return 0; | |
751 | } | |
752 | ||
753 | ||
754 | static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len, | |
755 | struct sk_buff *skb) | |
756 | { | |
757 | struct ipv6_pinfo *np = inet6_sk(sk); | |
758 | ||
759 | if (skb->ip_summed == CHECKSUM_HW) { | |
760 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); | |
761 | skb->csum = offsetof(struct tcphdr, check); | |
762 | } else { | |
763 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, | |
764 | csum_partial((char *)th, th->doff<<2, | |
765 | skb->csum)); | |
766 | } | |
767 | } | |
768 | ||
769 | ||
770 | static void tcp_v6_send_reset(struct sk_buff *skb) | |
771 | { | |
772 | struct tcphdr *th = skb->h.th, *t1; | |
773 | struct sk_buff *buff; | |
774 | struct flowi fl; | |
775 | ||
776 | if (th->rst) | |
777 | return; | |
778 | ||
779 | if (!ipv6_unicast_destination(skb)) | |
780 | return; | |
781 | ||
782 | /* | |
783 | * We need to grab some memory, and put together an RST, | |
784 | * and then put it into the queue to be sent. | |
785 | */ | |
786 | ||
787 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr), | |
788 | GFP_ATOMIC); | |
789 | if (buff == NULL) | |
790 | return; | |
791 | ||
792 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr)); | |
793 | ||
794 | t1 = (struct tcphdr *) skb_push(buff,sizeof(struct tcphdr)); | |
795 | ||
796 | /* Swap the send and the receive. */ | |
797 | memset(t1, 0, sizeof(*t1)); | |
798 | t1->dest = th->source; | |
799 | t1->source = th->dest; | |
800 | t1->doff = sizeof(*t1)/4; | |
801 | t1->rst = 1; | |
802 | ||
803 | if(th->ack) { | |
804 | t1->seq = th->ack_seq; | |
805 | } else { | |
806 | t1->ack = 1; | |
807 | t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin | |
808 | + skb->len - (th->doff<<2)); | |
809 | } | |
810 | ||
811 | buff->csum = csum_partial((char *)t1, sizeof(*t1), 0); | |
812 | ||
813 | memset(&fl, 0, sizeof(fl)); | |
814 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); | |
815 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); | |
816 | ||
817 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
818 | sizeof(*t1), IPPROTO_TCP, | |
819 | buff->csum); | |
820 | ||
821 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 822 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
823 | fl.fl_ip_dport = t1->dest; |
824 | fl.fl_ip_sport = t1->source; | |
825 | ||
826 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
827 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
828 | ||
ecc51b6d ACM |
829 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
830 | ip6_xmit(NULL, buff, &fl, NULL, 0); | |
831 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
832 | TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); | |
1da177e4 | 833 | return; |
ecc51b6d | 834 | } |
1da177e4 LT |
835 | } |
836 | ||
837 | kfree_skb(buff); | |
838 | } | |
839 | ||
840 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts) | |
841 | { | |
842 | struct tcphdr *th = skb->h.th, *t1; | |
843 | struct sk_buff *buff; | |
844 | struct flowi fl; | |
845 | int tot_len = sizeof(struct tcphdr); | |
846 | ||
847 | if (ts) | |
848 | tot_len += 3*4; | |
849 | ||
850 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, | |
851 | GFP_ATOMIC); | |
852 | if (buff == NULL) | |
853 | return; | |
854 | ||
855 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); | |
856 | ||
857 | t1 = (struct tcphdr *) skb_push(buff,tot_len); | |
858 | ||
859 | /* Swap the send and the receive. */ | |
860 | memset(t1, 0, sizeof(*t1)); | |
861 | t1->dest = th->source; | |
862 | t1->source = th->dest; | |
863 | t1->doff = tot_len/4; | |
864 | t1->seq = htonl(seq); | |
865 | t1->ack_seq = htonl(ack); | |
866 | t1->ack = 1; | |
867 | t1->window = htons(win); | |
868 | ||
869 | if (ts) { | |
870 | u32 *ptr = (u32*)(t1 + 1); | |
871 | *ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
872 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
873 | *ptr++ = htonl(tcp_time_stamp); | |
874 | *ptr = htonl(ts); | |
875 | } | |
876 | ||
877 | buff->csum = csum_partial((char *)t1, tot_len, 0); | |
878 | ||
879 | memset(&fl, 0, sizeof(fl)); | |
880 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); | |
881 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); | |
882 | ||
883 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
884 | tot_len, IPPROTO_TCP, | |
885 | buff->csum); | |
886 | ||
887 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 888 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
889 | fl.fl_ip_dport = t1->dest; |
890 | fl.fl_ip_sport = t1->source; | |
891 | ||
892 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
ecc51b6d ACM |
893 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
894 | ip6_xmit(NULL, buff, &fl, NULL, 0); | |
895 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
1da177e4 | 896 | return; |
ecc51b6d | 897 | } |
1da177e4 LT |
898 | } |
899 | ||
900 | kfree_skb(buff); | |
901 | } | |
902 | ||
903 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
904 | { | |
8feaf0c0 ACM |
905 | struct inet_timewait_sock *tw = inet_twsk(sk); |
906 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sk); | |
1da177e4 | 907 | |
8feaf0c0 ACM |
908 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
909 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, | |
910 | tcptw->tw_ts_recent); | |
1da177e4 | 911 | |
8feaf0c0 | 912 | inet_twsk_put(tw); |
1da177e4 LT |
913 | } |
914 | ||
60236fdd | 915 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req) |
1da177e4 | 916 | { |
2e6599cb | 917 | 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 |
918 | } |
919 | ||
920 | ||
921 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
922 | { | |
60236fdd | 923 | struct request_sock *req, **prev; |
505cbfc5 | 924 | const struct tcphdr *th = skb->h.th; |
1da177e4 LT |
925 | struct sock *nsk; |
926 | ||
927 | /* Find possible connection requests. */ | |
8129765a ACM |
928 | req = inet6_csk_search_req(sk, &prev, th->source, |
929 | &skb->nh.ipv6h->saddr, | |
930 | &skb->nh.ipv6h->daddr, inet6_iif(skb)); | |
1da177e4 LT |
931 | if (req) |
932 | return tcp_check_req(sk, skb, req, prev); | |
933 | ||
505cbfc5 ACM |
934 | nsk = __inet6_lookup_established(&tcp_hashinfo, &skb->nh.ipv6h->saddr, |
935 | th->source, &skb->nh.ipv6h->daddr, | |
936 | ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
937 | |
938 | if (nsk) { | |
939 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
940 | bh_lock_sock(nsk); | |
941 | return nsk; | |
942 | } | |
8feaf0c0 | 943 | inet_twsk_put((struct inet_timewait_sock *)nsk); |
1da177e4 LT |
944 | return NULL; |
945 | } | |
946 | ||
947 | #if 0 /*def CONFIG_SYN_COOKIES*/ | |
948 | if (!th->rst && !th->syn && th->ack) | |
949 | sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt)); | |
950 | #endif | |
951 | return sk; | |
952 | } | |
953 | ||
1da177e4 LT |
954 | /* FIXME: this is substantially similar to the ipv4 code. |
955 | * Can some kind of merge be done? -- erics | |
956 | */ | |
957 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
958 | { | |
2e6599cb | 959 | struct tcp6_request_sock *treq; |
1da177e4 LT |
960 | struct ipv6_pinfo *np = inet6_sk(sk); |
961 | struct tcp_options_received tmp_opt; | |
962 | struct tcp_sock *tp = tcp_sk(sk); | |
60236fdd | 963 | struct request_sock *req = NULL; |
1da177e4 LT |
964 | __u32 isn = TCP_SKB_CB(skb)->when; |
965 | ||
966 | if (skb->protocol == htons(ETH_P_IP)) | |
967 | return tcp_v4_conn_request(sk, skb); | |
968 | ||
969 | if (!ipv6_unicast_destination(skb)) | |
970 | goto drop; | |
971 | ||
972 | /* | |
973 | * There are no SYN attacks on IPv6, yet... | |
974 | */ | |
463c84b9 | 975 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 LT |
976 | if (net_ratelimit()) |
977 | printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n"); | |
978 | goto drop; | |
979 | } | |
980 | ||
463c84b9 | 981 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
982 | goto drop; |
983 | ||
60236fdd | 984 | req = reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
985 | if (req == NULL) |
986 | goto drop; | |
987 | ||
988 | tcp_clear_options(&tmp_opt); | |
989 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
990 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
991 | ||
992 | tcp_parse_options(skb, &tmp_opt, 0); | |
993 | ||
994 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; | |
995 | tcp_openreq_init(req, &tmp_opt, skb); | |
996 | ||
2e6599cb ACM |
997 | treq = tcp6_rsk(req); |
998 | ipv6_addr_copy(&treq->rmt_addr, &skb->nh.ipv6h->saddr); | |
999 | ipv6_addr_copy(&treq->loc_addr, &skb->nh.ipv6h->daddr); | |
1da177e4 | 1000 | TCP_ECN_create_request(req, skb->h.th); |
2e6599cb | 1001 | treq->pktopts = NULL; |
1da177e4 | 1002 | if (ipv6_opt_accepted(sk, skb) || |
333fad53 YH |
1003 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
1004 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1da177e4 | 1005 | atomic_inc(&skb->users); |
2e6599cb | 1006 | treq->pktopts = skb; |
1da177e4 | 1007 | } |
2e6599cb | 1008 | treq->iif = sk->sk_bound_dev_if; |
1da177e4 LT |
1009 | |
1010 | /* So that link locals have meaning */ | |
1011 | if (!sk->sk_bound_dev_if && | |
2e6599cb | 1012 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) |
505cbfc5 | 1013 | treq->iif = inet6_iif(skb); |
1da177e4 LT |
1014 | |
1015 | if (isn == 0) | |
1016 | isn = tcp_v6_init_sequence(sk,skb); | |
1017 | ||
2e6599cb | 1018 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 LT |
1019 | |
1020 | if (tcp_v6_send_synack(sk, req, NULL)) | |
1021 | goto drop; | |
1022 | ||
8129765a | 1023 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1da177e4 LT |
1024 | return 0; |
1025 | ||
1026 | drop: | |
1027 | if (req) | |
60236fdd | 1028 | reqsk_free(req); |
1da177e4 LT |
1029 | |
1030 | TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS); | |
1031 | return 0; /* don't send reset */ | |
1032 | } | |
1033 | ||
1034 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1035 | struct request_sock *req, |
1da177e4 LT |
1036 | struct dst_entry *dst) |
1037 | { | |
2e6599cb | 1038 | struct tcp6_request_sock *treq = tcp6_rsk(req); |
1da177e4 LT |
1039 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1040 | struct tcp6_sock *newtcp6sk; | |
1041 | struct inet_sock *newinet; | |
1042 | struct tcp_sock *newtp; | |
1043 | struct sock *newsk; | |
1044 | struct ipv6_txoptions *opt; | |
1045 | ||
1046 | if (skb->protocol == htons(ETH_P_IP)) { | |
1047 | /* | |
1048 | * v6 mapped | |
1049 | */ | |
1050 | ||
1051 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1052 | ||
1053 | if (newsk == NULL) | |
1054 | return NULL; | |
1055 | ||
1056 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1057 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1058 | ||
1059 | newinet = inet_sk(newsk); | |
1060 | newnp = inet6_sk(newsk); | |
1061 | newtp = tcp_sk(newsk); | |
1062 | ||
1063 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1064 | ||
1065 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
1066 | newinet->daddr); | |
1067 | ||
1068 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
1069 | newinet->saddr); | |
1070 | ||
1071 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1072 | ||
1073 | newtp->af_specific = &ipv6_mapped; | |
1074 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; | |
1075 | newnp->pktoptions = NULL; | |
1076 | newnp->opt = NULL; | |
505cbfc5 | 1077 | newnp->mcast_oif = inet6_iif(skb); |
1da177e4 LT |
1078 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; |
1079 | ||
e6848976 ACM |
1080 | /* |
1081 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1082 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1083 | * that function for the gory details. -acme | |
1da177e4 | 1084 | */ |
1da177e4 LT |
1085 | |
1086 | /* It is tricky place. Until this moment IPv4 tcp | |
1087 | worked with IPv6 af_tcp.af_specific. | |
1088 | Sync it now. | |
1089 | */ | |
1090 | tcp_sync_mss(newsk, newtp->pmtu_cookie); | |
1091 | ||
1092 | return newsk; | |
1093 | } | |
1094 | ||
1095 | opt = np->opt; | |
1096 | ||
1097 | if (sk_acceptq_is_full(sk)) | |
1098 | goto out_overflow; | |
1099 | ||
333fad53 | 1100 | if (np->rxopt.bits.osrcrt == 2 && |
2e6599cb ACM |
1101 | opt == NULL && treq->pktopts) { |
1102 | struct inet6_skb_parm *rxopt = IP6CB(treq->pktopts); | |
1da177e4 | 1103 | if (rxopt->srcrt) |
2e6599cb | 1104 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr *)(treq->pktopts->nh.raw + rxopt->srcrt)); |
1da177e4 LT |
1105 | } |
1106 | ||
1107 | if (dst == NULL) { | |
1108 | struct in6_addr *final_p = NULL, final; | |
1109 | struct flowi fl; | |
1110 | ||
1111 | memset(&fl, 0, sizeof(fl)); | |
1112 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1113 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
1114 | if (opt && opt->srcrt) { |
1115 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1116 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1117 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1118 | final_p = &final; | |
1119 | } | |
2e6599cb | 1120 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1121 | fl.oif = sk->sk_bound_dev_if; |
2e6599cb | 1122 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
1da177e4 LT |
1123 | fl.fl_ip_sport = inet_sk(sk)->sport; |
1124 | ||
1125 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1126 | goto out; | |
1127 | ||
1128 | if (final_p) | |
1129 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1130 | ||
1131 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
1132 | goto out; | |
1133 | } | |
1134 | ||
1135 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1136 | if (newsk == NULL) | |
1137 | goto out; | |
1138 | ||
e6848976 ACM |
1139 | /* |
1140 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1141 | * count here, tcp_create_openreq_child now does this for us, see the | |
1142 | * comment in that function for the gory details. -acme | |
1143 | */ | |
1da177e4 LT |
1144 | |
1145 | ip6_dst_store(newsk, dst, NULL); | |
1146 | newsk->sk_route_caps = dst->dev->features & | |
1147 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1148 | ||
1149 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1150 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1151 | ||
1152 | newtp = tcp_sk(newsk); | |
1153 | newinet = inet_sk(newsk); | |
1154 | newnp = inet6_sk(newsk); | |
1155 | ||
1156 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1157 | ||
2e6599cb ACM |
1158 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1159 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1160 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1161 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 LT |
1162 | |
1163 | /* Now IPv6 options... | |
1164 | ||
1165 | First: no IPv4 options. | |
1166 | */ | |
1167 | newinet->opt = NULL; | |
1168 | ||
1169 | /* Clone RX bits */ | |
1170 | newnp->rxopt.all = np->rxopt.all; | |
1171 | ||
1172 | /* Clone pktoptions received with SYN */ | |
1173 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1174 | if (treq->pktopts != NULL) { |
1175 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1176 | kfree_skb(treq->pktopts); | |
1177 | treq->pktopts = NULL; | |
1da177e4 LT |
1178 | if (newnp->pktoptions) |
1179 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1180 | } | |
1181 | newnp->opt = NULL; | |
505cbfc5 | 1182 | newnp->mcast_oif = inet6_iif(skb); |
1da177e4 LT |
1183 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; |
1184 | ||
1185 | /* Clone native IPv6 options from listening socket (if any) | |
1186 | ||
1187 | Yes, keeping reference count would be much more clever, | |
1188 | but we make one more one thing there: reattach optmem | |
1189 | to newsk. | |
1190 | */ | |
1191 | if (opt) { | |
1192 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1193 | if (opt != np->opt) | |
1194 | sock_kfree_s(sk, opt, opt->tot_len); | |
1195 | } | |
1196 | ||
1197 | newtp->ext_header_len = 0; | |
1198 | if (newnp->opt) | |
1199 | newtp->ext_header_len = newnp->opt->opt_nflen + | |
1200 | newnp->opt->opt_flen; | |
1201 | ||
1202 | tcp_sync_mss(newsk, dst_mtu(dst)); | |
1203 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1204 | tcp_initialize_rcv_mss(newsk); | |
1205 | ||
1206 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
1207 | ||
90b19d31 | 1208 | __inet6_hash(&tcp_hashinfo, newsk); |
2d8c4ce5 | 1209 | inet_inherit_port(&tcp_hashinfo, sk, newsk); |
1da177e4 LT |
1210 | |
1211 | return newsk; | |
1212 | ||
1213 | out_overflow: | |
1214 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
1215 | out: | |
1216 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
1217 | if (opt && opt != np->opt) | |
1218 | sock_kfree_s(sk, opt, opt->tot_len); | |
1219 | dst_release(dst); | |
1220 | return NULL; | |
1221 | } | |
1222 | ||
1223 | static int tcp_v6_checksum_init(struct sk_buff *skb) | |
1224 | { | |
1225 | if (skb->ip_summed == CHECKSUM_HW) { | |
1da177e4 | 1226 | if (!tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, |
fb286bb2 HX |
1227 | &skb->nh.ipv6h->daddr,skb->csum)) { |
1228 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1da177e4 | 1229 | return 0; |
fb286bb2 | 1230 | } |
1da177e4 | 1231 | } |
fb286bb2 HX |
1232 | |
1233 | skb->csum = ~tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, | |
1234 | &skb->nh.ipv6h->daddr, 0); | |
1235 | ||
1da177e4 | 1236 | if (skb->len <= 76) { |
fb286bb2 | 1237 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1238 | } |
1239 | return 0; | |
1240 | } | |
1241 | ||
1242 | /* The socket must have it's spinlock held when we get | |
1243 | * here. | |
1244 | * | |
1245 | * We have a potential double-lock case here, so even when | |
1246 | * doing backlog processing we use the BH locking scheme. | |
1247 | * This is because we cannot sleep with the original spinlock | |
1248 | * held. | |
1249 | */ | |
1250 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1251 | { | |
1252 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1253 | struct tcp_sock *tp; | |
1254 | struct sk_buff *opt_skb = NULL; | |
1255 | ||
1256 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1257 | goes to IPv4 receive handler and backlogged. | |
1258 | From backlog it always goes here. Kerboom... | |
1259 | Fortunately, tcp_rcv_established and rcv_established | |
1260 | handle them correctly, but it is not case with | |
1261 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1262 | */ | |
1263 | ||
1264 | if (skb->protocol == htons(ETH_P_IP)) | |
1265 | return tcp_v4_do_rcv(sk, skb); | |
1266 | ||
1267 | if (sk_filter(sk, skb, 0)) | |
1268 | goto discard; | |
1269 | ||
1270 | /* | |
1271 | * socket locking is here for SMP purposes as backlog rcv | |
1272 | * is currently called with bh processing disabled. | |
1273 | */ | |
1274 | ||
1275 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1276 | ||
1277 | Yes, guys, it is the only place in our code, where we | |
1278 | may make it not affecting IPv4. | |
1279 | The rest of code is protocol independent, | |
1280 | and I do not like idea to uglify IPv4. | |
1281 | ||
1282 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1283 | looks not very well thought. For now we latch | |
1284 | options, received in the last packet, enqueued | |
1285 | by tcp. Feel free to propose better solution. | |
1286 | --ANK (980728) | |
1287 | */ | |
1288 | if (np->rxopt.all) | |
1289 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1290 | ||
1291 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1292 | TCP_CHECK_TIMER(sk); | |
1293 | if (tcp_rcv_established(sk, skb, skb->h.th, skb->len)) | |
1294 | goto reset; | |
1295 | TCP_CHECK_TIMER(sk); | |
1296 | if (opt_skb) | |
1297 | goto ipv6_pktoptions; | |
1298 | return 0; | |
1299 | } | |
1300 | ||
1301 | if (skb->len < (skb->h.th->doff<<2) || tcp_checksum_complete(skb)) | |
1302 | goto csum_err; | |
1303 | ||
1304 | if (sk->sk_state == TCP_LISTEN) { | |
1305 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); | |
1306 | if (!nsk) | |
1307 | goto discard; | |
1308 | ||
1309 | /* | |
1310 | * Queue it on the new socket if the new socket is active, | |
1311 | * otherwise we just shortcircuit this and continue with | |
1312 | * the new socket.. | |
1313 | */ | |
1314 | if(nsk != sk) { | |
1315 | if (tcp_child_process(sk, nsk, skb)) | |
1316 | goto reset; | |
1317 | if (opt_skb) | |
1318 | __kfree_skb(opt_skb); | |
1319 | return 0; | |
1320 | } | |
1321 | } | |
1322 | ||
1323 | TCP_CHECK_TIMER(sk); | |
1324 | if (tcp_rcv_state_process(sk, skb, skb->h.th, skb->len)) | |
1325 | goto reset; | |
1326 | TCP_CHECK_TIMER(sk); | |
1327 | if (opt_skb) | |
1328 | goto ipv6_pktoptions; | |
1329 | return 0; | |
1330 | ||
1331 | reset: | |
1332 | tcp_v6_send_reset(skb); | |
1333 | discard: | |
1334 | if (opt_skb) | |
1335 | __kfree_skb(opt_skb); | |
1336 | kfree_skb(skb); | |
1337 | return 0; | |
1338 | csum_err: | |
1339 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1340 | goto discard; | |
1341 | ||
1342 | ||
1343 | ipv6_pktoptions: | |
1344 | /* Do you ask, what is it? | |
1345 | ||
1346 | 1. skb was enqueued by tcp. | |
1347 | 2. skb is added to tail of read queue, rather than out of order. | |
1348 | 3. socket is not in passive state. | |
1349 | 4. Finally, it really contains options, which user wants to receive. | |
1350 | */ | |
1351 | tp = tcp_sk(sk); | |
1352 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1353 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1354 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1355 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1356 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
1da177e4 LT |
1357 | np->mcast_hops = opt_skb->nh.ipv6h->hop_limit; |
1358 | if (ipv6_opt_accepted(sk, opt_skb)) { | |
1359 | skb_set_owner_r(opt_skb, sk); | |
1360 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1361 | } else { | |
1362 | __kfree_skb(opt_skb); | |
1363 | opt_skb = xchg(&np->pktoptions, NULL); | |
1364 | } | |
1365 | } | |
1366 | ||
1367 | if (opt_skb) | |
1368 | kfree_skb(opt_skb); | |
1369 | return 0; | |
1370 | } | |
1371 | ||
1372 | static int tcp_v6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) | |
1373 | { | |
1374 | struct sk_buff *skb = *pskb; | |
1375 | struct tcphdr *th; | |
1376 | struct sock *sk; | |
1377 | int ret; | |
1378 | ||
1379 | if (skb->pkt_type != PACKET_HOST) | |
1380 | goto discard_it; | |
1381 | ||
1382 | /* | |
1383 | * Count it even if it's bad. | |
1384 | */ | |
1385 | TCP_INC_STATS_BH(TCP_MIB_INSEGS); | |
1386 | ||
1387 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1388 | goto discard_it; | |
1389 | ||
1390 | th = skb->h.th; | |
1391 | ||
1392 | if (th->doff < sizeof(struct tcphdr)/4) | |
1393 | goto bad_packet; | |
1394 | if (!pskb_may_pull(skb, th->doff*4)) | |
1395 | goto discard_it; | |
1396 | ||
1397 | if ((skb->ip_summed != CHECKSUM_UNNECESSARY && | |
fb286bb2 | 1398 | tcp_v6_checksum_init(skb))) |
1da177e4 LT |
1399 | goto bad_packet; |
1400 | ||
1401 | th = skb->h.th; | |
1402 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1403 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1404 | skb->len - th->doff*4); | |
1405 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1406 | TCP_SKB_CB(skb)->when = 0; | |
1407 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(skb->nh.ipv6h); | |
1408 | TCP_SKB_CB(skb)->sacked = 0; | |
1409 | ||
505cbfc5 ACM |
1410 | sk = __inet6_lookup(&tcp_hashinfo, &skb->nh.ipv6h->saddr, th->source, |
1411 | &skb->nh.ipv6h->daddr, ntohs(th->dest), | |
1412 | inet6_iif(skb)); | |
1da177e4 LT |
1413 | |
1414 | if (!sk) | |
1415 | goto no_tcp_socket; | |
1416 | ||
1417 | process: | |
1418 | if (sk->sk_state == TCP_TIME_WAIT) | |
1419 | goto do_time_wait; | |
1420 | ||
1421 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1422 | goto discard_and_relse; | |
1423 | ||
1424 | if (sk_filter(sk, skb, 0)) | |
1425 | goto discard_and_relse; | |
1426 | ||
1427 | skb->dev = NULL; | |
1428 | ||
1429 | bh_lock_sock(sk); | |
1430 | ret = 0; | |
1431 | if (!sock_owned_by_user(sk)) { | |
1432 | if (!tcp_prequeue(sk, skb)) | |
1433 | ret = tcp_v6_do_rcv(sk, skb); | |
1434 | } else | |
1435 | sk_add_backlog(sk, skb); | |
1436 | bh_unlock_sock(sk); | |
1437 | ||
1438 | sock_put(sk); | |
1439 | return ret ? -1 : 0; | |
1440 | ||
1441 | no_tcp_socket: | |
1442 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1443 | goto discard_it; | |
1444 | ||
1445 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1446 | bad_packet: | |
1447 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1448 | } else { | |
1449 | tcp_v6_send_reset(skb); | |
1450 | } | |
1451 | ||
1452 | discard_it: | |
1453 | ||
1454 | /* | |
1455 | * Discard frame | |
1456 | */ | |
1457 | ||
1458 | kfree_skb(skb); | |
1459 | return 0; | |
1460 | ||
1461 | discard_and_relse: | |
1462 | sock_put(sk); | |
1463 | goto discard_it; | |
1464 | ||
1465 | do_time_wait: | |
1466 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
8feaf0c0 | 1467 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
1468 | goto discard_it; |
1469 | } | |
1470 | ||
1471 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1472 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
8feaf0c0 | 1473 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
1474 | goto discard_it; |
1475 | } | |
1476 | ||
8feaf0c0 ACM |
1477 | switch (tcp_timewait_state_process((struct inet_timewait_sock *)sk, |
1478 | skb, th)) { | |
1da177e4 LT |
1479 | case TCP_TW_SYN: |
1480 | { | |
1481 | struct sock *sk2; | |
1482 | ||
505cbfc5 ACM |
1483 | sk2 = inet6_lookup_listener(&tcp_hashinfo, |
1484 | &skb->nh.ipv6h->daddr, | |
1485 | ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 | 1486 | if (sk2 != NULL) { |
295ff7ed ACM |
1487 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1488 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1489 | inet_twsk_put(tw); | |
1da177e4 LT |
1490 | sk = sk2; |
1491 | goto process; | |
1492 | } | |
1493 | /* Fall through to ACK */ | |
1494 | } | |
1495 | case TCP_TW_ACK: | |
1496 | tcp_v6_timewait_ack(sk, skb); | |
1497 | break; | |
1498 | case TCP_TW_RST: | |
1499 | goto no_tcp_socket; | |
1500 | case TCP_TW_SUCCESS:; | |
1501 | } | |
1502 | goto discard_it; | |
1503 | } | |
1504 | ||
1505 | static int tcp_v6_rebuild_header(struct sock *sk) | |
1506 | { | |
1507 | int err; | |
1508 | struct dst_entry *dst; | |
1509 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1510 | ||
1511 | dst = __sk_dst_check(sk, np->dst_cookie); | |
1512 | ||
1513 | if (dst == NULL) { | |
1514 | struct inet_sock *inet = inet_sk(sk); | |
1515 | struct in6_addr *final_p = NULL, final; | |
1516 | struct flowi fl; | |
1517 | ||
1518 | memset(&fl, 0, sizeof(fl)); | |
1519 | fl.proto = IPPROTO_TCP; | |
1520 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
1521 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
1522 | fl.fl6_flowlabel = np->flow_label; | |
1523 | fl.oif = sk->sk_bound_dev_if; | |
1524 | fl.fl_ip_dport = inet->dport; | |
1525 | fl.fl_ip_sport = inet->sport; | |
1526 | ||
1527 | if (np->opt && np->opt->srcrt) { | |
1528 | struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; | |
1529 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1530 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1531 | final_p = &final; | |
1532 | } | |
1533 | ||
1534 | err = ip6_dst_lookup(sk, &dst, &fl); | |
1535 | if (err) { | |
1536 | sk->sk_route_caps = 0; | |
1537 | return err; | |
1538 | } | |
1539 | if (final_p) | |
1540 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1541 | ||
1542 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
1543 | sk->sk_err_soft = -err; | |
1da177e4 LT |
1544 | return err; |
1545 | } | |
1546 | ||
1547 | ip6_dst_store(sk, dst, NULL); | |
1548 | sk->sk_route_caps = dst->dev->features & | |
1549 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1550 | } | |
1551 | ||
1552 | return 0; | |
1553 | } | |
1554 | ||
1555 | static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok) | |
1556 | { | |
1557 | struct sock *sk = skb->sk; | |
1558 | struct inet_sock *inet = inet_sk(sk); | |
1559 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1560 | struct flowi fl; | |
1561 | struct dst_entry *dst; | |
1562 | struct in6_addr *final_p = NULL, final; | |
1563 | ||
1564 | memset(&fl, 0, sizeof(fl)); | |
1565 | fl.proto = IPPROTO_TCP; | |
1566 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
1567 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
1568 | fl.fl6_flowlabel = np->flow_label; | |
1569 | IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); | |
1570 | fl.oif = sk->sk_bound_dev_if; | |
1571 | fl.fl_ip_sport = inet->sport; | |
1572 | fl.fl_ip_dport = inet->dport; | |
1573 | ||
1574 | if (np->opt && np->opt->srcrt) { | |
1575 | struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; | |
1576 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1577 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1578 | final_p = &final; | |
1579 | } | |
1580 | ||
1581 | dst = __sk_dst_check(sk, np->dst_cookie); | |
1582 | ||
1583 | if (dst == NULL) { | |
1584 | int err = ip6_dst_lookup(sk, &dst, &fl); | |
1585 | ||
1586 | if (err) { | |
1587 | sk->sk_err_soft = -err; | |
1588 | return err; | |
1589 | } | |
1590 | ||
1591 | if (final_p) | |
1592 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1593 | ||
1594 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
1595 | sk->sk_route_caps = 0; | |
1da177e4 LT |
1596 | return err; |
1597 | } | |
1598 | ||
1599 | ip6_dst_store(sk, dst, NULL); | |
1600 | sk->sk_route_caps = dst->dev->features & | |
1601 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1602 | } | |
1603 | ||
1604 | skb->dst = dst_clone(dst); | |
1605 | ||
1606 | /* Restore final destination back after routing done */ | |
1607 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
1608 | ||
1609 | return ip6_xmit(sk, skb, &fl, np->opt, 0); | |
1610 | } | |
1611 | ||
1612 | static void v6_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) | |
1613 | { | |
1614 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1615 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; | |
1616 | ||
1617 | sin6->sin6_family = AF_INET6; | |
1618 | ipv6_addr_copy(&sin6->sin6_addr, &np->daddr); | |
1619 | sin6->sin6_port = inet_sk(sk)->dport; | |
1620 | /* We do not store received flowlabel for TCP */ | |
1621 | sin6->sin6_flowinfo = 0; | |
1622 | sin6->sin6_scope_id = 0; | |
1623 | if (sk->sk_bound_dev_if && | |
1624 | ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
1625 | sin6->sin6_scope_id = sk->sk_bound_dev_if; | |
1626 | } | |
1627 | ||
1628 | static int tcp_v6_remember_stamp(struct sock *sk) | |
1629 | { | |
1630 | /* Alas, not yet... */ | |
1631 | return 0; | |
1632 | } | |
1633 | ||
1634 | static struct tcp_func ipv6_specific = { | |
1635 | .queue_xmit = tcp_v6_xmit, | |
1636 | .send_check = tcp_v6_send_check, | |
1637 | .rebuild_header = tcp_v6_rebuild_header, | |
1638 | .conn_request = tcp_v6_conn_request, | |
1639 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1640 | .remember_stamp = tcp_v6_remember_stamp, | |
1641 | .net_header_len = sizeof(struct ipv6hdr), | |
1642 | ||
1643 | .setsockopt = ipv6_setsockopt, | |
1644 | .getsockopt = ipv6_getsockopt, | |
1645 | .addr2sockaddr = v6_addr2sockaddr, | |
1646 | .sockaddr_len = sizeof(struct sockaddr_in6) | |
1647 | }; | |
1648 | ||
1649 | /* | |
1650 | * TCP over IPv4 via INET6 API | |
1651 | */ | |
1652 | ||
1653 | static struct tcp_func ipv6_mapped = { | |
1654 | .queue_xmit = ip_queue_xmit, | |
1655 | .send_check = tcp_v4_send_check, | |
32519f11 | 1656 | .rebuild_header = inet_sk_rebuild_header, |
1da177e4 LT |
1657 | .conn_request = tcp_v6_conn_request, |
1658 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1659 | .remember_stamp = tcp_v4_remember_stamp, | |
1660 | .net_header_len = sizeof(struct iphdr), | |
1661 | ||
1662 | .setsockopt = ipv6_setsockopt, | |
1663 | .getsockopt = ipv6_getsockopt, | |
1664 | .addr2sockaddr = v6_addr2sockaddr, | |
1665 | .sockaddr_len = sizeof(struct sockaddr_in6) | |
1666 | }; | |
1667 | ||
1668 | ||
1669 | ||
1670 | /* NOTE: A lot of things set to zero explicitly by call to | |
1671 | * sk_alloc() so need not be done here. | |
1672 | */ | |
1673 | static int tcp_v6_init_sock(struct sock *sk) | |
1674 | { | |
6687e988 | 1675 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1676 | struct tcp_sock *tp = tcp_sk(sk); |
1677 | ||
1678 | skb_queue_head_init(&tp->out_of_order_queue); | |
1679 | tcp_init_xmit_timers(sk); | |
1680 | tcp_prequeue_init(tp); | |
1681 | ||
6687e988 | 1682 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1683 | tp->mdev = TCP_TIMEOUT_INIT; |
1684 | ||
1685 | /* So many TCP implementations out there (incorrectly) count the | |
1686 | * initial SYN frame in their delayed-ACK and congestion control | |
1687 | * algorithms that we must have the following bandaid to talk | |
1688 | * efficiently to them. -DaveM | |
1689 | */ | |
1690 | tp->snd_cwnd = 2; | |
1691 | ||
1692 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1693 | * initialization of these values. | |
1694 | */ | |
1695 | tp->snd_ssthresh = 0x7fffffff; | |
1696 | tp->snd_cwnd_clamp = ~0; | |
c1b4a7e6 | 1697 | tp->mss_cache = 536; |
1da177e4 LT |
1698 | |
1699 | tp->reordering = sysctl_tcp_reordering; | |
1700 | ||
1701 | sk->sk_state = TCP_CLOSE; | |
1702 | ||
1703 | tp->af_specific = &ipv6_specific; | |
6687e988 | 1704 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
1da177e4 LT |
1705 | sk->sk_write_space = sk_stream_write_space; |
1706 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1707 | ||
1708 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; | |
1709 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1710 | ||
1711 | atomic_inc(&tcp_sockets_allocated); | |
1712 | ||
1713 | return 0; | |
1714 | } | |
1715 | ||
1716 | static int tcp_v6_destroy_sock(struct sock *sk) | |
1717 | { | |
1da177e4 LT |
1718 | tcp_v4_destroy_sock(sk); |
1719 | return inet6_destroy_sock(sk); | |
1720 | } | |
1721 | ||
1722 | /* Proc filesystem TCPv6 sock list dumping. */ | |
1723 | static void get_openreq6(struct seq_file *seq, | |
60236fdd | 1724 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 LT |
1725 | { |
1726 | struct in6_addr *dest, *src; | |
1727 | int ttd = req->expires - jiffies; | |
1728 | ||
1729 | if (ttd < 0) | |
1730 | ttd = 0; | |
1731 | ||
2e6599cb ACM |
1732 | src = &tcp6_rsk(req)->loc_addr; |
1733 | dest = &tcp6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1734 | seq_printf(seq, |
1735 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1736 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1737 | i, | |
1738 | src->s6_addr32[0], src->s6_addr32[1], | |
1739 | src->s6_addr32[2], src->s6_addr32[3], | |
1740 | ntohs(inet_sk(sk)->sport), | |
1741 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1742 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1743 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1744 | TCP_SYN_RECV, |
1745 | 0,0, /* could print option size, but that is af dependent. */ | |
1746 | 1, /* timers active (only the expire timer) */ | |
1747 | jiffies_to_clock_t(ttd), | |
1748 | req->retrans, | |
1749 | uid, | |
1750 | 0, /* non standard timer */ | |
1751 | 0, /* open_requests have no inode */ | |
1752 | 0, req); | |
1753 | } | |
1754 | ||
1755 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1756 | { | |
1757 | struct in6_addr *dest, *src; | |
1758 | __u16 destp, srcp; | |
1759 | int timer_active; | |
1760 | unsigned long timer_expires; | |
1761 | struct inet_sock *inet = inet_sk(sp); | |
1762 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1763 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
1764 | struct ipv6_pinfo *np = inet6_sk(sp); |
1765 | ||
1766 | dest = &np->daddr; | |
1767 | src = &np->rcv_saddr; | |
1768 | destp = ntohs(inet->dport); | |
1769 | srcp = ntohs(inet->sport); | |
463c84b9 ACM |
1770 | |
1771 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1772 | timer_active = 1; |
463c84b9 ACM |
1773 | timer_expires = icsk->icsk_timeout; |
1774 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1775 | timer_active = 4; |
463c84b9 | 1776 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1777 | } else if (timer_pending(&sp->sk_timer)) { |
1778 | timer_active = 2; | |
1779 | timer_expires = sp->sk_timer.expires; | |
1780 | } else { | |
1781 | timer_active = 0; | |
1782 | timer_expires = jiffies; | |
1783 | } | |
1784 | ||
1785 | seq_printf(seq, | |
1786 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1787 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n", | |
1788 | i, | |
1789 | src->s6_addr32[0], src->s6_addr32[1], | |
1790 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1791 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1792 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1793 | sp->sk_state, | |
1794 | tp->write_seq-tp->snd_una, tp->rcv_nxt-tp->copied_seq, | |
1795 | timer_active, | |
1796 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 1797 | icsk->icsk_retransmits, |
1da177e4 | 1798 | sock_i_uid(sp), |
6687e988 | 1799 | icsk->icsk_probes_out, |
1da177e4 LT |
1800 | sock_i_ino(sp), |
1801 | atomic_read(&sp->sk_refcnt), sp, | |
463c84b9 ACM |
1802 | icsk->icsk_rto, |
1803 | icsk->icsk_ack.ato, | |
1804 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, | |
1da177e4 LT |
1805 | tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh |
1806 | ); | |
1807 | } | |
1808 | ||
1809 | static void get_timewait6_sock(struct seq_file *seq, | |
8feaf0c0 | 1810 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
1811 | { |
1812 | struct in6_addr *dest, *src; | |
1813 | __u16 destp, srcp; | |
8feaf0c0 | 1814 | struct tcp6_timewait_sock *tcp6tw = tcp6_twsk((struct sock *)tw); |
1da177e4 LT |
1815 | int ttd = tw->tw_ttd - jiffies; |
1816 | ||
1817 | if (ttd < 0) | |
1818 | ttd = 0; | |
1819 | ||
8feaf0c0 ACM |
1820 | dest = &tcp6tw->tw_v6_daddr; |
1821 | src = &tcp6tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1822 | destp = ntohs(tw->tw_dport); |
1823 | srcp = ntohs(tw->tw_sport); | |
1824 | ||
1825 | seq_printf(seq, | |
1826 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1827 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1828 | i, | |
1829 | src->s6_addr32[0], src->s6_addr32[1], | |
1830 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1831 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1832 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1833 | tw->tw_substate, 0, 0, | |
1834 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
1835 | atomic_read(&tw->tw_refcnt), tw); | |
1836 | } | |
1837 | ||
1838 | #ifdef CONFIG_PROC_FS | |
1839 | static int tcp6_seq_show(struct seq_file *seq, void *v) | |
1840 | { | |
1841 | struct tcp_iter_state *st; | |
1842 | ||
1843 | if (v == SEQ_START_TOKEN) { | |
1844 | seq_puts(seq, | |
1845 | " sl " | |
1846 | "local_address " | |
1847 | "remote_address " | |
1848 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1849 | " uid timeout inode\n"); | |
1850 | goto out; | |
1851 | } | |
1852 | st = seq->private; | |
1853 | ||
1854 | switch (st->state) { | |
1855 | case TCP_SEQ_STATE_LISTENING: | |
1856 | case TCP_SEQ_STATE_ESTABLISHED: | |
1857 | get_tcp6_sock(seq, v, st->num); | |
1858 | break; | |
1859 | case TCP_SEQ_STATE_OPENREQ: | |
1860 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
1861 | break; | |
1862 | case TCP_SEQ_STATE_TIME_WAIT: | |
1863 | get_timewait6_sock(seq, v, st->num); | |
1864 | break; | |
1865 | } | |
1866 | out: | |
1867 | return 0; | |
1868 | } | |
1869 | ||
1870 | static struct file_operations tcp6_seq_fops; | |
1871 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { | |
1872 | .owner = THIS_MODULE, | |
1873 | .name = "tcp6", | |
1874 | .family = AF_INET6, | |
1875 | .seq_show = tcp6_seq_show, | |
1876 | .seq_fops = &tcp6_seq_fops, | |
1877 | }; | |
1878 | ||
1879 | int __init tcp6_proc_init(void) | |
1880 | { | |
1881 | return tcp_proc_register(&tcp6_seq_afinfo); | |
1882 | } | |
1883 | ||
1884 | void tcp6_proc_exit(void) | |
1885 | { | |
1886 | tcp_proc_unregister(&tcp6_seq_afinfo); | |
1887 | } | |
1888 | #endif | |
1889 | ||
1890 | struct proto tcpv6_prot = { | |
1891 | .name = "TCPv6", | |
1892 | .owner = THIS_MODULE, | |
1893 | .close = tcp_close, | |
1894 | .connect = tcp_v6_connect, | |
1895 | .disconnect = tcp_disconnect, | |
463c84b9 | 1896 | .accept = inet_csk_accept, |
1da177e4 LT |
1897 | .ioctl = tcp_ioctl, |
1898 | .init = tcp_v6_init_sock, | |
1899 | .destroy = tcp_v6_destroy_sock, | |
1900 | .shutdown = tcp_shutdown, | |
1901 | .setsockopt = tcp_setsockopt, | |
1902 | .getsockopt = tcp_getsockopt, | |
1903 | .sendmsg = tcp_sendmsg, | |
1904 | .recvmsg = tcp_recvmsg, | |
1905 | .backlog_rcv = tcp_v6_do_rcv, | |
1906 | .hash = tcp_v6_hash, | |
1907 | .unhash = tcp_unhash, | |
1908 | .get_port = tcp_v6_get_port, | |
1909 | .enter_memory_pressure = tcp_enter_memory_pressure, | |
1910 | .sockets_allocated = &tcp_sockets_allocated, | |
1911 | .memory_allocated = &tcp_memory_allocated, | |
1912 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1913 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
1914 | .sysctl_mem = sysctl_tcp_mem, |
1915 | .sysctl_wmem = sysctl_tcp_wmem, | |
1916 | .sysctl_rmem = sysctl_tcp_rmem, | |
1917 | .max_header = MAX_TCP_HEADER, | |
1918 | .obj_size = sizeof(struct tcp6_sock), | |
8feaf0c0 | 1919 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), |
60236fdd | 1920 | .rsk_prot = &tcp6_request_sock_ops, |
1da177e4 LT |
1921 | }; |
1922 | ||
1923 | static struct inet6_protocol tcpv6_protocol = { | |
1924 | .handler = tcp_v6_rcv, | |
1925 | .err_handler = tcp_v6_err, | |
1926 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1927 | }; | |
1928 | ||
1da177e4 LT |
1929 | static struct inet_protosw tcpv6_protosw = { |
1930 | .type = SOCK_STREAM, | |
1931 | .protocol = IPPROTO_TCP, | |
1932 | .prot = &tcpv6_prot, | |
1933 | .ops = &inet6_stream_ops, | |
1934 | .capability = -1, | |
1935 | .no_check = 0, | |
1936 | .flags = INET_PROTOSW_PERMANENT, | |
1937 | }; | |
1938 | ||
1939 | void __init tcpv6_init(void) | |
1940 | { | |
1941 | /* register inet6 protocol */ | |
1942 | if (inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP) < 0) | |
1943 | printk(KERN_ERR "tcpv6_init: Could not register protocol\n"); | |
1944 | inet6_register_protosw(&tcpv6_protosw); | |
1945 | } |