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> | |
1da177e4 LT |
29 | #include <linux/errno.h> |
30 | #include <linux/types.h> | |
31 | #include <linux/socket.h> | |
32 | #include <linux/sockios.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/jiffies.h> | |
35 | #include <linux/in.h> | |
36 | #include <linux/in6.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/jhash.h> | |
40 | #include <linux/ipsec.h> | |
41 | #include <linux/times.h> | |
42 | ||
43 | #include <linux/ipv6.h> | |
44 | #include <linux/icmpv6.h> | |
45 | #include <linux/random.h> | |
46 | ||
47 | #include <net/tcp.h> | |
48 | #include <net/ndisc.h> | |
5324a040 | 49 | #include <net/inet6_hashtables.h> |
8129765a | 50 | #include <net/inet6_connection_sock.h> |
1da177e4 LT |
51 | #include <net/ipv6.h> |
52 | #include <net/transp_v6.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/ip6_route.h> | |
55 | #include <net/ip6_checksum.h> | |
56 | #include <net/inet_ecn.h> | |
57 | #include <net/protocol.h> | |
58 | #include <net/xfrm.h> | |
59 | #include <net/addrconf.h> | |
60 | #include <net/snmp.h> | |
61 | #include <net/dsfield.h> | |
6d6ee43e | 62 | #include <net/timewait_sock.h> |
1da177e4 LT |
63 | |
64 | #include <asm/uaccess.h> | |
65 | ||
66 | #include <linux/proc_fs.h> | |
67 | #include <linux/seq_file.h> | |
68 | ||
ae0f7d5f DW |
69 | /* Socket used for sending RSTs and ACKs */ |
70 | static struct socket *tcp6_socket; | |
71 | ||
1da177e4 | 72 | static void tcp_v6_send_reset(struct sk_buff *skb); |
60236fdd | 73 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req); |
8292a17a | 74 | static void tcp_v6_send_check(struct sock *sk, int len, |
1da177e4 LT |
75 | struct sk_buff *skb); |
76 | ||
77 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 78 | |
8292a17a ACM |
79 | static struct inet_connection_sock_af_ops ipv6_mapped; |
80 | static struct inet_connection_sock_af_ops ipv6_specific; | |
1da177e4 | 81 | |
1da177e4 LT |
82 | static int tcp_v6_get_port(struct sock *sk, unsigned short snum) |
83 | { | |
971af18b ACM |
84 | return inet_csk_get_port(&tcp_hashinfo, sk, snum, |
85 | inet6_csk_bind_conflict); | |
1da177e4 LT |
86 | } |
87 | ||
1da177e4 LT |
88 | static void tcp_v6_hash(struct sock *sk) |
89 | { | |
90 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 91 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
92 | tcp_prot.hash(sk); |
93 | return; | |
94 | } | |
95 | local_bh_disable(); | |
90b19d31 | 96 | __inet6_hash(&tcp_hashinfo, sk); |
1da177e4 LT |
97 | local_bh_enable(); |
98 | } | |
99 | } | |
100 | ||
1da177e4 LT |
101 | static __inline__ u16 tcp_v6_check(struct tcphdr *th, int len, |
102 | struct in6_addr *saddr, | |
103 | struct in6_addr *daddr, | |
104 | unsigned long base) | |
105 | { | |
106 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
107 | } | |
108 | ||
a94f723d | 109 | static __u32 tcp_v6_init_sequence(struct sk_buff *skb) |
1da177e4 | 110 | { |
a94f723d GR |
111 | return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32, |
112 | skb->nh.ipv6h->saddr.s6_addr32, | |
113 | skb->h.th->dest, | |
114 | skb->h.th->source); | |
1da177e4 LT |
115 | } |
116 | ||
1da177e4 LT |
117 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
118 | int addr_len) | |
119 | { | |
120 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
d83d8461 ACM |
121 | struct inet_sock *inet = inet_sk(sk); |
122 | struct inet_connection_sock *icsk = inet_csk(sk); | |
1da177e4 LT |
123 | struct ipv6_pinfo *np = inet6_sk(sk); |
124 | struct tcp_sock *tp = tcp_sk(sk); | |
125 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
126 | struct flowi fl; | |
127 | struct dst_entry *dst; | |
128 | int addr_type; | |
129 | int err; | |
130 | ||
131 | if (addr_len < SIN6_LEN_RFC2133) | |
132 | return -EINVAL; | |
133 | ||
134 | if (usin->sin6_family != AF_INET6) | |
135 | return(-EAFNOSUPPORT); | |
136 | ||
137 | memset(&fl, 0, sizeof(fl)); | |
138 | ||
139 | if (np->sndflow) { | |
140 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
141 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
142 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
143 | struct ip6_flowlabel *flowlabel; | |
144 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
145 | if (flowlabel == NULL) | |
146 | return -EINVAL; | |
147 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
148 | fl6_sock_release(flowlabel); | |
149 | } | |
150 | } | |
151 | ||
152 | /* | |
153 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
154 | */ | |
155 | ||
156 | if(ipv6_addr_any(&usin->sin6_addr)) | |
157 | usin->sin6_addr.s6_addr[15] = 0x1; | |
158 | ||
159 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
160 | ||
161 | if(addr_type & IPV6_ADDR_MULTICAST) | |
162 | return -ENETUNREACH; | |
163 | ||
164 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
165 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
166 | usin->sin6_scope_id) { | |
167 | /* If interface is set while binding, indices | |
168 | * must coincide. | |
169 | */ | |
170 | if (sk->sk_bound_dev_if && | |
171 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
172 | return -EINVAL; | |
173 | ||
174 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
175 | } | |
176 | ||
177 | /* Connect to link-local address requires an interface */ | |
178 | if (!sk->sk_bound_dev_if) | |
179 | return -EINVAL; | |
180 | } | |
181 | ||
182 | if (tp->rx_opt.ts_recent_stamp && | |
183 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
184 | tp->rx_opt.ts_recent = 0; | |
185 | tp->rx_opt.ts_recent_stamp = 0; | |
186 | tp->write_seq = 0; | |
187 | } | |
188 | ||
189 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
190 | np->flow_label = fl.fl6_flowlabel; | |
191 | ||
192 | /* | |
193 | * TCP over IPv4 | |
194 | */ | |
195 | ||
196 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 197 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
198 | struct sockaddr_in sin; |
199 | ||
200 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
201 | ||
202 | if (__ipv6_only_sock(sk)) | |
203 | return -ENETUNREACH; | |
204 | ||
205 | sin.sin_family = AF_INET; | |
206 | sin.sin_port = usin->sin6_port; | |
207 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
208 | ||
d83d8461 | 209 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 LT |
210 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
211 | ||
212 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
213 | ||
214 | if (err) { | |
d83d8461 ACM |
215 | icsk->icsk_ext_hdr_len = exthdrlen; |
216 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 LT |
217 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
218 | goto failure; | |
219 | } else { | |
220 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
221 | inet->saddr); | |
222 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
223 | inet->rcv_saddr); | |
224 | } | |
225 | ||
226 | return err; | |
227 | } | |
228 | ||
229 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
230 | saddr = &np->rcv_saddr; | |
231 | ||
232 | fl.proto = IPPROTO_TCP; | |
233 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
234 | ipv6_addr_copy(&fl.fl6_src, | |
235 | (saddr ? saddr : &np->saddr)); | |
236 | fl.oif = sk->sk_bound_dev_if; | |
237 | fl.fl_ip_dport = usin->sin6_port; | |
238 | fl.fl_ip_sport = inet->sport; | |
239 | ||
240 | if (np->opt && np->opt->srcrt) { | |
241 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
242 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
243 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
244 | final_p = &final; | |
245 | } | |
246 | ||
beb8d13b VY |
247 | security_sk_classify_flow(sk, &fl); |
248 | ||
1da177e4 LT |
249 | err = ip6_dst_lookup(sk, &dst, &fl); |
250 | if (err) | |
251 | goto failure; | |
252 | if (final_p) | |
253 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
254 | ||
e104411b | 255 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
1da177e4 | 256 | goto failure; |
1da177e4 LT |
257 | |
258 | if (saddr == NULL) { | |
259 | saddr = &fl.fl6_src; | |
260 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
261 | } | |
262 | ||
263 | /* set the source address */ | |
264 | ipv6_addr_copy(&np->saddr, saddr); | |
265 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
266 | ||
f83ef8c0 | 267 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 268 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 269 | |
d83d8461 | 270 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 271 | if (np->opt) |
d83d8461 ACM |
272 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
273 | np->opt->opt_nflen); | |
1da177e4 LT |
274 | |
275 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
276 | ||
277 | inet->dport = usin->sin6_port; | |
278 | ||
279 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 280 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
281 | if (err) |
282 | goto late_failure; | |
283 | ||
284 | if (!tp->write_seq) | |
285 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
286 | np->daddr.s6_addr32, | |
287 | inet->sport, | |
288 | inet->dport); | |
289 | ||
290 | err = tcp_connect(sk); | |
291 | if (err) | |
292 | goto late_failure; | |
293 | ||
294 | return 0; | |
295 | ||
296 | late_failure: | |
297 | tcp_set_state(sk, TCP_CLOSE); | |
298 | __sk_dst_reset(sk); | |
299 | failure: | |
300 | inet->dport = 0; | |
301 | sk->sk_route_caps = 0; | |
302 | return err; | |
303 | } | |
304 | ||
305 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
04ce6909 | 306 | int type, int code, int offset, __be32 info) |
1da177e4 LT |
307 | { |
308 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
505cbfc5 | 309 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
310 | struct ipv6_pinfo *np; |
311 | struct sock *sk; | |
312 | int err; | |
313 | struct tcp_sock *tp; | |
314 | __u32 seq; | |
315 | ||
505cbfc5 ACM |
316 | sk = inet6_lookup(&tcp_hashinfo, &hdr->daddr, th->dest, &hdr->saddr, |
317 | th->source, skb->dev->ifindex); | |
1da177e4 LT |
318 | |
319 | if (sk == NULL) { | |
320 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
321 | return; | |
322 | } | |
323 | ||
324 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 325 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
326 | return; |
327 | } | |
328 | ||
329 | bh_lock_sock(sk); | |
330 | if (sock_owned_by_user(sk)) | |
331 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
332 | ||
333 | if (sk->sk_state == TCP_CLOSE) | |
334 | goto out; | |
335 | ||
336 | tp = tcp_sk(sk); | |
337 | seq = ntohl(th->seq); | |
338 | if (sk->sk_state != TCP_LISTEN && | |
339 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
340 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
341 | goto out; | |
342 | } | |
343 | ||
344 | np = inet6_sk(sk); | |
345 | ||
346 | if (type == ICMPV6_PKT_TOOBIG) { | |
347 | struct dst_entry *dst = NULL; | |
348 | ||
349 | if (sock_owned_by_user(sk)) | |
350 | goto out; | |
351 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
352 | goto out; | |
353 | ||
354 | /* icmp should have updated the destination cache entry */ | |
355 | dst = __sk_dst_check(sk, np->dst_cookie); | |
356 | ||
357 | if (dst == NULL) { | |
358 | struct inet_sock *inet = inet_sk(sk); | |
359 | struct flowi fl; | |
360 | ||
361 | /* BUGGG_FUTURE: Again, it is not clear how | |
362 | to handle rthdr case. Ignore this complexity | |
363 | for now. | |
364 | */ | |
365 | memset(&fl, 0, sizeof(fl)); | |
366 | fl.proto = IPPROTO_TCP; | |
367 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
368 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
369 | fl.oif = sk->sk_bound_dev_if; | |
370 | fl.fl_ip_dport = inet->dport; | |
371 | fl.fl_ip_sport = inet->sport; | |
beb8d13b | 372 | security_skb_classify_flow(skb, &fl); |
1da177e4 LT |
373 | |
374 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
375 | sk->sk_err_soft = -err; | |
376 | goto out; | |
377 | } | |
378 | ||
379 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
380 | sk->sk_err_soft = -err; | |
381 | goto out; | |
382 | } | |
383 | ||
384 | } else | |
385 | dst_hold(dst); | |
386 | ||
d83d8461 | 387 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
1da177e4 LT |
388 | tcp_sync_mss(sk, dst_mtu(dst)); |
389 | tcp_simple_retransmit(sk); | |
390 | } /* else let the usual retransmit timer handle it */ | |
391 | dst_release(dst); | |
392 | goto out; | |
393 | } | |
394 | ||
395 | icmpv6_err_convert(type, code, &err); | |
396 | ||
60236fdd | 397 | /* Might be for an request_sock */ |
1da177e4 | 398 | switch (sk->sk_state) { |
60236fdd | 399 | struct request_sock *req, **prev; |
1da177e4 LT |
400 | case TCP_LISTEN: |
401 | if (sock_owned_by_user(sk)) | |
402 | goto out; | |
403 | ||
8129765a ACM |
404 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
405 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
406 | if (!req) |
407 | goto out; | |
408 | ||
409 | /* ICMPs are not backlogged, hence we cannot get | |
410 | * an established socket here. | |
411 | */ | |
412 | BUG_TRAP(req->sk == NULL); | |
413 | ||
2e6599cb | 414 | if (seq != tcp_rsk(req)->snt_isn) { |
1da177e4 LT |
415 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
416 | goto out; | |
417 | } | |
418 | ||
463c84b9 | 419 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
420 | goto out; |
421 | ||
422 | case TCP_SYN_SENT: | |
423 | case TCP_SYN_RECV: /* Cannot happen. | |
424 | It can, it SYNs are crossed. --ANK */ | |
425 | if (!sock_owned_by_user(sk)) { | |
1da177e4 LT |
426 | sk->sk_err = err; |
427 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
428 | ||
429 | tcp_done(sk); | |
430 | } else | |
431 | sk->sk_err_soft = err; | |
432 | goto out; | |
433 | } | |
434 | ||
435 | if (!sock_owned_by_user(sk) && np->recverr) { | |
436 | sk->sk_err = err; | |
437 | sk->sk_error_report(sk); | |
438 | } else | |
439 | sk->sk_err_soft = err; | |
440 | ||
441 | out: | |
442 | bh_unlock_sock(sk); | |
443 | sock_put(sk); | |
444 | } | |
445 | ||
446 | ||
60236fdd | 447 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, |
1da177e4 LT |
448 | struct dst_entry *dst) |
449 | { | |
ca304b61 | 450 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
451 | struct ipv6_pinfo *np = inet6_sk(sk); |
452 | struct sk_buff * skb; | |
453 | struct ipv6_txoptions *opt = NULL; | |
454 | struct in6_addr * final_p = NULL, final; | |
455 | struct flowi fl; | |
456 | int err = -1; | |
457 | ||
458 | memset(&fl, 0, sizeof(fl)); | |
459 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
460 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
461 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 462 | fl.fl6_flowlabel = 0; |
2e6599cb ACM |
463 | fl.oif = treq->iif; |
464 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
1da177e4 | 465 | fl.fl_ip_sport = inet_sk(sk)->sport; |
4237c75c | 466 | security_req_classify_flow(req, &fl); |
1da177e4 LT |
467 | |
468 | if (dst == NULL) { | |
469 | opt = np->opt; | |
470 | if (opt == NULL && | |
333fad53 | 471 | np->rxopt.bits.osrcrt == 2 && |
2e6599cb ACM |
472 | treq->pktopts) { |
473 | struct sk_buff *pktopts = treq->pktopts; | |
1da177e4 LT |
474 | struct inet6_skb_parm *rxopt = IP6CB(pktopts); |
475 | if (rxopt->srcrt) | |
476 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr*)(pktopts->nh.raw + rxopt->srcrt)); | |
477 | } | |
478 | ||
479 | if (opt && opt->srcrt) { | |
480 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
481 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
482 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
483 | final_p = &final; | |
484 | } | |
485 | ||
486 | err = ip6_dst_lookup(sk, &dst, &fl); | |
487 | if (err) | |
488 | goto done; | |
489 | if (final_p) | |
490 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
491 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
492 | goto done; | |
493 | } | |
494 | ||
495 | skb = tcp_make_synack(sk, dst, req); | |
496 | if (skb) { | |
497 | struct tcphdr *th = skb->h.th; | |
498 | ||
499 | th->check = tcp_v6_check(th, skb->len, | |
2e6599cb | 500 | &treq->loc_addr, &treq->rmt_addr, |
1da177e4 LT |
501 | csum_partial((char *)th, skb->len, skb->csum)); |
502 | ||
2e6599cb | 503 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 | 504 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
b9df3cb8 | 505 | err = net_xmit_eval(err); |
1da177e4 LT |
506 | } |
507 | ||
508 | done: | |
1da177e4 LT |
509 | if (opt && opt != np->opt) |
510 | sock_kfree_s(sk, opt, opt->tot_len); | |
78b91042 | 511 | dst_release(dst); |
1da177e4 LT |
512 | return err; |
513 | } | |
514 | ||
60236fdd | 515 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 516 | { |
ca304b61 ACM |
517 | if (inet6_rsk(req)->pktopts) |
518 | kfree_skb(inet6_rsk(req)->pktopts); | |
1da177e4 LT |
519 | } |
520 | ||
9ec75fe8 | 521 | static struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 522 | .family = AF_INET6, |
2e6599cb | 523 | .obj_size = sizeof(struct tcp6_request_sock), |
1da177e4 | 524 | .rtx_syn_ack = tcp_v6_send_synack, |
60236fdd ACM |
525 | .send_ack = tcp_v6_reqsk_send_ack, |
526 | .destructor = tcp_v6_reqsk_destructor, | |
1da177e4 LT |
527 | .send_reset = tcp_v6_send_reset |
528 | }; | |
529 | ||
6d6ee43e ACM |
530 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
531 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
532 | .twsk_unique = tcp_twsk_unique, | |
533 | }; | |
534 | ||
8292a17a | 535 | static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) |
1da177e4 LT |
536 | { |
537 | struct ipv6_pinfo *np = inet6_sk(sk); | |
8292a17a | 538 | struct tcphdr *th = skb->h.th; |
1da177e4 | 539 | |
84fa7933 | 540 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1da177e4 LT |
541 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); |
542 | skb->csum = offsetof(struct tcphdr, check); | |
543 | } else { | |
544 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, | |
545 | csum_partial((char *)th, th->doff<<2, | |
546 | skb->csum)); | |
547 | } | |
548 | } | |
549 | ||
a430a43d HX |
550 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
551 | { | |
552 | struct ipv6hdr *ipv6h; | |
553 | struct tcphdr *th; | |
554 | ||
555 | if (!pskb_may_pull(skb, sizeof(*th))) | |
556 | return -EINVAL; | |
557 | ||
558 | ipv6h = skb->nh.ipv6h; | |
559 | th = skb->h.th; | |
560 | ||
561 | th->check = 0; | |
562 | th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, | |
563 | IPPROTO_TCP, 0); | |
564 | skb->csum = offsetof(struct tcphdr, check); | |
84fa7933 | 565 | skb->ip_summed = CHECKSUM_PARTIAL; |
a430a43d HX |
566 | return 0; |
567 | } | |
1da177e4 LT |
568 | |
569 | static void tcp_v6_send_reset(struct sk_buff *skb) | |
570 | { | |
571 | struct tcphdr *th = skb->h.th, *t1; | |
572 | struct sk_buff *buff; | |
573 | struct flowi fl; | |
574 | ||
575 | if (th->rst) | |
576 | return; | |
577 | ||
578 | if (!ipv6_unicast_destination(skb)) | |
579 | return; | |
580 | ||
581 | /* | |
582 | * We need to grab some memory, and put together an RST, | |
583 | * and then put it into the queue to be sent. | |
584 | */ | |
585 | ||
586 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr), | |
587 | GFP_ATOMIC); | |
588 | if (buff == NULL) | |
589 | return; | |
590 | ||
591 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr)); | |
592 | ||
593 | t1 = (struct tcphdr *) skb_push(buff,sizeof(struct tcphdr)); | |
594 | ||
595 | /* Swap the send and the receive. */ | |
596 | memset(t1, 0, sizeof(*t1)); | |
597 | t1->dest = th->source; | |
598 | t1->source = th->dest; | |
599 | t1->doff = sizeof(*t1)/4; | |
600 | t1->rst = 1; | |
601 | ||
602 | if(th->ack) { | |
603 | t1->seq = th->ack_seq; | |
604 | } else { | |
605 | t1->ack = 1; | |
606 | t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin | |
607 | + skb->len - (th->doff<<2)); | |
608 | } | |
609 | ||
610 | buff->csum = csum_partial((char *)t1, sizeof(*t1), 0); | |
611 | ||
612 | memset(&fl, 0, sizeof(fl)); | |
613 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); | |
614 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); | |
615 | ||
616 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
617 | sizeof(*t1), IPPROTO_TCP, | |
618 | buff->csum); | |
619 | ||
620 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 621 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
622 | fl.fl_ip_dport = t1->dest; |
623 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 624 | security_skb_classify_flow(skb, &fl); |
1da177e4 LT |
625 | |
626 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
627 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
628 | ||
ecc51b6d | 629 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
ae0f7d5f | 630 | ip6_xmit(tcp6_socket->sk, buff, &fl, NULL, 0); |
ecc51b6d ACM |
631 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); |
632 | TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); | |
1da177e4 | 633 | return; |
ecc51b6d | 634 | } |
1da177e4 LT |
635 | } |
636 | ||
637 | kfree_skb(buff); | |
638 | } | |
639 | ||
640 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts) | |
641 | { | |
642 | struct tcphdr *th = skb->h.th, *t1; | |
643 | struct sk_buff *buff; | |
644 | struct flowi fl; | |
645 | int tot_len = sizeof(struct tcphdr); | |
646 | ||
647 | if (ts) | |
4244f8a9 | 648 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
1da177e4 LT |
649 | |
650 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, | |
651 | GFP_ATOMIC); | |
652 | if (buff == NULL) | |
653 | return; | |
654 | ||
655 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); | |
656 | ||
657 | t1 = (struct tcphdr *) skb_push(buff,tot_len); | |
658 | ||
659 | /* Swap the send and the receive. */ | |
660 | memset(t1, 0, sizeof(*t1)); | |
661 | t1->dest = th->source; | |
662 | t1->source = th->dest; | |
663 | t1->doff = tot_len/4; | |
664 | t1->seq = htonl(seq); | |
665 | t1->ack_seq = htonl(ack); | |
666 | t1->ack = 1; | |
667 | t1->window = htons(win); | |
668 | ||
669 | if (ts) { | |
670 | u32 *ptr = (u32*)(t1 + 1); | |
671 | *ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
672 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
673 | *ptr++ = htonl(tcp_time_stamp); | |
674 | *ptr = htonl(ts); | |
675 | } | |
676 | ||
677 | buff->csum = csum_partial((char *)t1, tot_len, 0); | |
678 | ||
679 | memset(&fl, 0, sizeof(fl)); | |
680 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); | |
681 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); | |
682 | ||
683 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
684 | tot_len, IPPROTO_TCP, | |
685 | buff->csum); | |
686 | ||
687 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 688 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
689 | fl.fl_ip_dport = t1->dest; |
690 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 691 | security_skb_classify_flow(skb, &fl); |
1da177e4 LT |
692 | |
693 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
ecc51b6d | 694 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
ae0f7d5f | 695 | ip6_xmit(tcp6_socket->sk, buff, &fl, NULL, 0); |
ecc51b6d | 696 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); |
1da177e4 | 697 | return; |
ecc51b6d | 698 | } |
1da177e4 LT |
699 | } |
700 | ||
701 | kfree_skb(buff); | |
702 | } | |
703 | ||
704 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
705 | { | |
8feaf0c0 ACM |
706 | struct inet_timewait_sock *tw = inet_twsk(sk); |
707 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sk); | |
1da177e4 | 708 | |
8feaf0c0 ACM |
709 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
710 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, | |
711 | tcptw->tw_ts_recent); | |
1da177e4 | 712 | |
8feaf0c0 | 713 | inet_twsk_put(tw); |
1da177e4 LT |
714 | } |
715 | ||
60236fdd | 716 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req) |
1da177e4 | 717 | { |
2e6599cb | 718 | 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 |
719 | } |
720 | ||
721 | ||
722 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
723 | { | |
60236fdd | 724 | struct request_sock *req, **prev; |
505cbfc5 | 725 | const struct tcphdr *th = skb->h.th; |
1da177e4 LT |
726 | struct sock *nsk; |
727 | ||
728 | /* Find possible connection requests. */ | |
8129765a ACM |
729 | req = inet6_csk_search_req(sk, &prev, th->source, |
730 | &skb->nh.ipv6h->saddr, | |
731 | &skb->nh.ipv6h->daddr, inet6_iif(skb)); | |
1da177e4 LT |
732 | if (req) |
733 | return tcp_check_req(sk, skb, req, prev); | |
734 | ||
505cbfc5 ACM |
735 | nsk = __inet6_lookup_established(&tcp_hashinfo, &skb->nh.ipv6h->saddr, |
736 | th->source, &skb->nh.ipv6h->daddr, | |
737 | ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
738 | |
739 | if (nsk) { | |
740 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
741 | bh_lock_sock(nsk); | |
742 | return nsk; | |
743 | } | |
9469c7b4 | 744 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
745 | return NULL; |
746 | } | |
747 | ||
748 | #if 0 /*def CONFIG_SYN_COOKIES*/ | |
749 | if (!th->rst && !th->syn && th->ack) | |
750 | sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt)); | |
751 | #endif | |
752 | return sk; | |
753 | } | |
754 | ||
1da177e4 LT |
755 | /* FIXME: this is substantially similar to the ipv4 code. |
756 | * Can some kind of merge be done? -- erics | |
757 | */ | |
758 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
759 | { | |
ca304b61 | 760 | struct inet6_request_sock *treq; |
1da177e4 LT |
761 | struct ipv6_pinfo *np = inet6_sk(sk); |
762 | struct tcp_options_received tmp_opt; | |
763 | struct tcp_sock *tp = tcp_sk(sk); | |
60236fdd | 764 | struct request_sock *req = NULL; |
1da177e4 LT |
765 | __u32 isn = TCP_SKB_CB(skb)->when; |
766 | ||
767 | if (skb->protocol == htons(ETH_P_IP)) | |
768 | return tcp_v4_conn_request(sk, skb); | |
769 | ||
770 | if (!ipv6_unicast_destination(skb)) | |
771 | goto drop; | |
772 | ||
773 | /* | |
774 | * There are no SYN attacks on IPv6, yet... | |
775 | */ | |
463c84b9 | 776 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 LT |
777 | if (net_ratelimit()) |
778 | printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n"); | |
779 | goto drop; | |
780 | } | |
781 | ||
463c84b9 | 782 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
783 | goto drop; |
784 | ||
ca304b61 | 785 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
786 | if (req == NULL) |
787 | goto drop; | |
788 | ||
789 | tcp_clear_options(&tmp_opt); | |
790 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
791 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
792 | ||
793 | tcp_parse_options(skb, &tmp_opt, 0); | |
794 | ||
795 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; | |
796 | tcp_openreq_init(req, &tmp_opt, skb); | |
797 | ||
ca304b61 | 798 | treq = inet6_rsk(req); |
2e6599cb ACM |
799 | ipv6_addr_copy(&treq->rmt_addr, &skb->nh.ipv6h->saddr); |
800 | ipv6_addr_copy(&treq->loc_addr, &skb->nh.ipv6h->daddr); | |
1da177e4 | 801 | TCP_ECN_create_request(req, skb->h.th); |
2e6599cb | 802 | treq->pktopts = NULL; |
1da177e4 | 803 | if (ipv6_opt_accepted(sk, skb) || |
333fad53 YH |
804 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
805 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1da177e4 | 806 | atomic_inc(&skb->users); |
2e6599cb | 807 | treq->pktopts = skb; |
1da177e4 | 808 | } |
2e6599cb | 809 | treq->iif = sk->sk_bound_dev_if; |
1da177e4 LT |
810 | |
811 | /* So that link locals have meaning */ | |
812 | if (!sk->sk_bound_dev_if && | |
2e6599cb | 813 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) |
505cbfc5 | 814 | treq->iif = inet6_iif(skb); |
1da177e4 LT |
815 | |
816 | if (isn == 0) | |
a94f723d | 817 | isn = tcp_v6_init_sequence(skb); |
1da177e4 | 818 | |
2e6599cb | 819 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 820 | |
4237c75c VY |
821 | security_inet_conn_request(sk, skb, req); |
822 | ||
1da177e4 LT |
823 | if (tcp_v6_send_synack(sk, req, NULL)) |
824 | goto drop; | |
825 | ||
8129765a | 826 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1da177e4 LT |
827 | return 0; |
828 | ||
829 | drop: | |
830 | if (req) | |
60236fdd | 831 | reqsk_free(req); |
1da177e4 | 832 | |
1da177e4 LT |
833 | return 0; /* don't send reset */ |
834 | } | |
835 | ||
836 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 837 | struct request_sock *req, |
1da177e4 LT |
838 | struct dst_entry *dst) |
839 | { | |
ca304b61 | 840 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
841 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
842 | struct tcp6_sock *newtcp6sk; | |
843 | struct inet_sock *newinet; | |
844 | struct tcp_sock *newtp; | |
845 | struct sock *newsk; | |
846 | struct ipv6_txoptions *opt; | |
847 | ||
848 | if (skb->protocol == htons(ETH_P_IP)) { | |
849 | /* | |
850 | * v6 mapped | |
851 | */ | |
852 | ||
853 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
854 | ||
855 | if (newsk == NULL) | |
856 | return NULL; | |
857 | ||
858 | newtcp6sk = (struct tcp6_sock *)newsk; | |
859 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
860 | ||
861 | newinet = inet_sk(newsk); | |
862 | newnp = inet6_sk(newsk); | |
863 | newtp = tcp_sk(newsk); | |
864 | ||
865 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
866 | ||
867 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
868 | newinet->daddr); | |
869 | ||
870 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
871 | newinet->saddr); | |
872 | ||
873 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
874 | ||
8292a17a | 875 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 LT |
876 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
877 | newnp->pktoptions = NULL; | |
878 | newnp->opt = NULL; | |
505cbfc5 | 879 | newnp->mcast_oif = inet6_iif(skb); |
1da177e4 LT |
880 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; |
881 | ||
e6848976 ACM |
882 | /* |
883 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
884 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
885 | * that function for the gory details. -acme | |
1da177e4 | 886 | */ |
1da177e4 LT |
887 | |
888 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 889 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
890 | Sync it now. |
891 | */ | |
d83d8461 | 892 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
893 | |
894 | return newsk; | |
895 | } | |
896 | ||
897 | opt = np->opt; | |
898 | ||
899 | if (sk_acceptq_is_full(sk)) | |
900 | goto out_overflow; | |
901 | ||
333fad53 | 902 | if (np->rxopt.bits.osrcrt == 2 && |
2e6599cb ACM |
903 | opt == NULL && treq->pktopts) { |
904 | struct inet6_skb_parm *rxopt = IP6CB(treq->pktopts); | |
1da177e4 | 905 | if (rxopt->srcrt) |
2e6599cb | 906 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr *)(treq->pktopts->nh.raw + rxopt->srcrt)); |
1da177e4 LT |
907 | } |
908 | ||
909 | if (dst == NULL) { | |
910 | struct in6_addr *final_p = NULL, final; | |
911 | struct flowi fl; | |
912 | ||
913 | memset(&fl, 0, sizeof(fl)); | |
914 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 915 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
916 | if (opt && opt->srcrt) { |
917 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
918 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
919 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
920 | final_p = &final; | |
921 | } | |
2e6599cb | 922 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 923 | fl.oif = sk->sk_bound_dev_if; |
2e6599cb | 924 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
1da177e4 | 925 | fl.fl_ip_sport = inet_sk(sk)->sport; |
4237c75c | 926 | security_req_classify_flow(req, &fl); |
1da177e4 LT |
927 | |
928 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
929 | goto out; | |
930 | ||
931 | if (final_p) | |
932 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
933 | ||
934 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
935 | goto out; | |
936 | } | |
937 | ||
938 | newsk = tcp_create_openreq_child(sk, req, skb); | |
939 | if (newsk == NULL) | |
940 | goto out; | |
941 | ||
e6848976 ACM |
942 | /* |
943 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
944 | * count here, tcp_create_openreq_child now does this for us, see the | |
945 | * comment in that function for the gory details. -acme | |
946 | */ | |
1da177e4 | 947 | |
59eed279 | 948 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 949 | __ip6_dst_store(newsk, dst, NULL, NULL); |
1da177e4 LT |
950 | |
951 | newtcp6sk = (struct tcp6_sock *)newsk; | |
952 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
953 | ||
954 | newtp = tcp_sk(newsk); | |
955 | newinet = inet_sk(newsk); | |
956 | newnp = inet6_sk(newsk); | |
957 | ||
958 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
959 | ||
2e6599cb ACM |
960 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
961 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
962 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
963 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 LT |
964 | |
965 | /* Now IPv6 options... | |
966 | ||
967 | First: no IPv4 options. | |
968 | */ | |
969 | newinet->opt = NULL; | |
970 | ||
971 | /* Clone RX bits */ | |
972 | newnp->rxopt.all = np->rxopt.all; | |
973 | ||
974 | /* Clone pktoptions received with SYN */ | |
975 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
976 | if (treq->pktopts != NULL) { |
977 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
978 | kfree_skb(treq->pktopts); | |
979 | treq->pktopts = NULL; | |
1da177e4 LT |
980 | if (newnp->pktoptions) |
981 | skb_set_owner_r(newnp->pktoptions, newsk); | |
982 | } | |
983 | newnp->opt = NULL; | |
505cbfc5 | 984 | newnp->mcast_oif = inet6_iif(skb); |
1da177e4 LT |
985 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; |
986 | ||
987 | /* Clone native IPv6 options from listening socket (if any) | |
988 | ||
989 | Yes, keeping reference count would be much more clever, | |
990 | but we make one more one thing there: reattach optmem | |
991 | to newsk. | |
992 | */ | |
993 | if (opt) { | |
994 | newnp->opt = ipv6_dup_options(newsk, opt); | |
995 | if (opt != np->opt) | |
996 | sock_kfree_s(sk, opt, opt->tot_len); | |
997 | } | |
998 | ||
d83d8461 | 999 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1000 | if (newnp->opt) |
d83d8461 ACM |
1001 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1002 | newnp->opt->opt_flen); | |
1da177e4 | 1003 | |
5d424d5a | 1004 | tcp_mtup_init(newsk); |
1da177e4 LT |
1005 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1006 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1007 | tcp_initialize_rcv_mss(newsk); | |
1008 | ||
1009 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
1010 | ||
90b19d31 | 1011 | __inet6_hash(&tcp_hashinfo, newsk); |
2d8c4ce5 | 1012 | inet_inherit_port(&tcp_hashinfo, sk, newsk); |
1da177e4 LT |
1013 | |
1014 | return newsk; | |
1015 | ||
1016 | out_overflow: | |
1017 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
1018 | out: | |
1019 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
1020 | if (opt && opt != np->opt) | |
1021 | sock_kfree_s(sk, opt, opt->tot_len); | |
1022 | dst_release(dst); | |
1023 | return NULL; | |
1024 | } | |
1025 | ||
1026 | static int tcp_v6_checksum_init(struct sk_buff *skb) | |
1027 | { | |
84fa7933 | 1028 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
1da177e4 | 1029 | if (!tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, |
fb286bb2 HX |
1030 | &skb->nh.ipv6h->daddr,skb->csum)) { |
1031 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1da177e4 | 1032 | return 0; |
fb286bb2 | 1033 | } |
1da177e4 | 1034 | } |
fb286bb2 HX |
1035 | |
1036 | skb->csum = ~tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, | |
1037 | &skb->nh.ipv6h->daddr, 0); | |
1038 | ||
1da177e4 | 1039 | if (skb->len <= 76) { |
fb286bb2 | 1040 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1041 | } |
1042 | return 0; | |
1043 | } | |
1044 | ||
1045 | /* The socket must have it's spinlock held when we get | |
1046 | * here. | |
1047 | * | |
1048 | * We have a potential double-lock case here, so even when | |
1049 | * doing backlog processing we use the BH locking scheme. | |
1050 | * This is because we cannot sleep with the original spinlock | |
1051 | * held. | |
1052 | */ | |
1053 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1054 | { | |
1055 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1056 | struct tcp_sock *tp; | |
1057 | struct sk_buff *opt_skb = NULL; | |
1058 | ||
1059 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1060 | goes to IPv4 receive handler and backlogged. | |
1061 | From backlog it always goes here. Kerboom... | |
1062 | Fortunately, tcp_rcv_established and rcv_established | |
1063 | handle them correctly, but it is not case with | |
1064 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1065 | */ | |
1066 | ||
1067 | if (skb->protocol == htons(ETH_P_IP)) | |
1068 | return tcp_v4_do_rcv(sk, skb); | |
1069 | ||
fda9ef5d | 1070 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1071 | goto discard; |
1072 | ||
1073 | /* | |
1074 | * socket locking is here for SMP purposes as backlog rcv | |
1075 | * is currently called with bh processing disabled. | |
1076 | */ | |
1077 | ||
1078 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1079 | ||
1080 | Yes, guys, it is the only place in our code, where we | |
1081 | may make it not affecting IPv4. | |
1082 | The rest of code is protocol independent, | |
1083 | and I do not like idea to uglify IPv4. | |
1084 | ||
1085 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1086 | looks not very well thought. For now we latch | |
1087 | options, received in the last packet, enqueued | |
1088 | by tcp. Feel free to propose better solution. | |
1089 | --ANK (980728) | |
1090 | */ | |
1091 | if (np->rxopt.all) | |
1092 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1093 | ||
1094 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1095 | TCP_CHECK_TIMER(sk); | |
1096 | if (tcp_rcv_established(sk, skb, skb->h.th, skb->len)) | |
1097 | goto reset; | |
1098 | TCP_CHECK_TIMER(sk); | |
1099 | if (opt_skb) | |
1100 | goto ipv6_pktoptions; | |
1101 | return 0; | |
1102 | } | |
1103 | ||
1104 | if (skb->len < (skb->h.th->doff<<2) || tcp_checksum_complete(skb)) | |
1105 | goto csum_err; | |
1106 | ||
1107 | if (sk->sk_state == TCP_LISTEN) { | |
1108 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); | |
1109 | if (!nsk) | |
1110 | goto discard; | |
1111 | ||
1112 | /* | |
1113 | * Queue it on the new socket if the new socket is active, | |
1114 | * otherwise we just shortcircuit this and continue with | |
1115 | * the new socket.. | |
1116 | */ | |
1117 | if(nsk != sk) { | |
1118 | if (tcp_child_process(sk, nsk, skb)) | |
1119 | goto reset; | |
1120 | if (opt_skb) | |
1121 | __kfree_skb(opt_skb); | |
1122 | return 0; | |
1123 | } | |
1124 | } | |
1125 | ||
1126 | TCP_CHECK_TIMER(sk); | |
1127 | if (tcp_rcv_state_process(sk, skb, skb->h.th, skb->len)) | |
1128 | goto reset; | |
1129 | TCP_CHECK_TIMER(sk); | |
1130 | if (opt_skb) | |
1131 | goto ipv6_pktoptions; | |
1132 | return 0; | |
1133 | ||
1134 | reset: | |
1135 | tcp_v6_send_reset(skb); | |
1136 | discard: | |
1137 | if (opt_skb) | |
1138 | __kfree_skb(opt_skb); | |
1139 | kfree_skb(skb); | |
1140 | return 0; | |
1141 | csum_err: | |
1142 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1143 | goto discard; | |
1144 | ||
1145 | ||
1146 | ipv6_pktoptions: | |
1147 | /* Do you ask, what is it? | |
1148 | ||
1149 | 1. skb was enqueued by tcp. | |
1150 | 2. skb is added to tail of read queue, rather than out of order. | |
1151 | 3. socket is not in passive state. | |
1152 | 4. Finally, it really contains options, which user wants to receive. | |
1153 | */ | |
1154 | tp = tcp_sk(sk); | |
1155 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1156 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1157 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1158 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1159 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
1da177e4 LT |
1160 | np->mcast_hops = opt_skb->nh.ipv6h->hop_limit; |
1161 | if (ipv6_opt_accepted(sk, opt_skb)) { | |
1162 | skb_set_owner_r(opt_skb, sk); | |
1163 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1164 | } else { | |
1165 | __kfree_skb(opt_skb); | |
1166 | opt_skb = xchg(&np->pktoptions, NULL); | |
1167 | } | |
1168 | } | |
1169 | ||
1170 | if (opt_skb) | |
1171 | kfree_skb(opt_skb); | |
1172 | return 0; | |
1173 | } | |
1174 | ||
951dbc8a | 1175 | static int tcp_v6_rcv(struct sk_buff **pskb) |
1da177e4 LT |
1176 | { |
1177 | struct sk_buff *skb = *pskb; | |
1178 | struct tcphdr *th; | |
1179 | struct sock *sk; | |
1180 | int ret; | |
1181 | ||
1182 | if (skb->pkt_type != PACKET_HOST) | |
1183 | goto discard_it; | |
1184 | ||
1185 | /* | |
1186 | * Count it even if it's bad. | |
1187 | */ | |
1188 | TCP_INC_STATS_BH(TCP_MIB_INSEGS); | |
1189 | ||
1190 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1191 | goto discard_it; | |
1192 | ||
1193 | th = skb->h.th; | |
1194 | ||
1195 | if (th->doff < sizeof(struct tcphdr)/4) | |
1196 | goto bad_packet; | |
1197 | if (!pskb_may_pull(skb, th->doff*4)) | |
1198 | goto discard_it; | |
1199 | ||
1200 | if ((skb->ip_summed != CHECKSUM_UNNECESSARY && | |
fb286bb2 | 1201 | tcp_v6_checksum_init(skb))) |
1da177e4 LT |
1202 | goto bad_packet; |
1203 | ||
1204 | th = skb->h.th; | |
1205 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1206 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1207 | skb->len - th->doff*4); | |
1208 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1209 | TCP_SKB_CB(skb)->when = 0; | |
1210 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(skb->nh.ipv6h); | |
1211 | TCP_SKB_CB(skb)->sacked = 0; | |
1212 | ||
505cbfc5 ACM |
1213 | sk = __inet6_lookup(&tcp_hashinfo, &skb->nh.ipv6h->saddr, th->source, |
1214 | &skb->nh.ipv6h->daddr, ntohs(th->dest), | |
1215 | inet6_iif(skb)); | |
1da177e4 LT |
1216 | |
1217 | if (!sk) | |
1218 | goto no_tcp_socket; | |
1219 | ||
1220 | process: | |
1221 | if (sk->sk_state == TCP_TIME_WAIT) | |
1222 | goto do_time_wait; | |
1223 | ||
1224 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1225 | goto discard_and_relse; | |
1226 | ||
fda9ef5d | 1227 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1228 | goto discard_and_relse; |
1229 | ||
1230 | skb->dev = NULL; | |
1231 | ||
293b9c42 | 1232 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1233 | ret = 0; |
1234 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 CL |
1235 | #ifdef CONFIG_NET_DMA |
1236 | struct tcp_sock *tp = tcp_sk(sk); | |
1237 | if (tp->ucopy.dma_chan) | |
1238 | ret = tcp_v6_do_rcv(sk, skb); | |
1239 | else | |
1240 | #endif | |
1241 | { | |
1242 | if (!tcp_prequeue(sk, skb)) | |
1243 | ret = tcp_v6_do_rcv(sk, skb); | |
1244 | } | |
1da177e4 LT |
1245 | } else |
1246 | sk_add_backlog(sk, skb); | |
1247 | bh_unlock_sock(sk); | |
1248 | ||
1249 | sock_put(sk); | |
1250 | return ret ? -1 : 0; | |
1251 | ||
1252 | no_tcp_socket: | |
1253 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1254 | goto discard_it; | |
1255 | ||
1256 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1257 | bad_packet: | |
1258 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1259 | } else { | |
1260 | tcp_v6_send_reset(skb); | |
1261 | } | |
1262 | ||
1263 | discard_it: | |
1264 | ||
1265 | /* | |
1266 | * Discard frame | |
1267 | */ | |
1268 | ||
1269 | kfree_skb(skb); | |
1270 | return 0; | |
1271 | ||
1272 | discard_and_relse: | |
1273 | sock_put(sk); | |
1274 | goto discard_it; | |
1275 | ||
1276 | do_time_wait: | |
1277 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1278 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1279 | goto discard_it; |
1280 | } | |
1281 | ||
1282 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1283 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
9469c7b4 | 1284 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1285 | goto discard_it; |
1286 | } | |
1287 | ||
9469c7b4 | 1288 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1289 | case TCP_TW_SYN: |
1290 | { | |
1291 | struct sock *sk2; | |
1292 | ||
505cbfc5 ACM |
1293 | sk2 = inet6_lookup_listener(&tcp_hashinfo, |
1294 | &skb->nh.ipv6h->daddr, | |
1295 | ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 | 1296 | if (sk2 != NULL) { |
295ff7ed ACM |
1297 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1298 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1299 | inet_twsk_put(tw); | |
1da177e4 LT |
1300 | sk = sk2; |
1301 | goto process; | |
1302 | } | |
1303 | /* Fall through to ACK */ | |
1304 | } | |
1305 | case TCP_TW_ACK: | |
1306 | tcp_v6_timewait_ack(sk, skb); | |
1307 | break; | |
1308 | case TCP_TW_RST: | |
1309 | goto no_tcp_socket; | |
1310 | case TCP_TW_SUCCESS:; | |
1311 | } | |
1312 | goto discard_it; | |
1313 | } | |
1314 | ||
1da177e4 LT |
1315 | static int tcp_v6_remember_stamp(struct sock *sk) |
1316 | { | |
1317 | /* Alas, not yet... */ | |
1318 | return 0; | |
1319 | } | |
1320 | ||
8292a17a | 1321 | static struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1322 | .queue_xmit = inet6_csk_xmit, |
1323 | .send_check = tcp_v6_send_check, | |
1324 | .rebuild_header = inet6_sk_rebuild_header, | |
1325 | .conn_request = tcp_v6_conn_request, | |
1326 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1327 | .remember_stamp = tcp_v6_remember_stamp, | |
1328 | .net_header_len = sizeof(struct ipv6hdr), | |
1329 | .setsockopt = ipv6_setsockopt, | |
1330 | .getsockopt = ipv6_getsockopt, | |
1331 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1332 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1333 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1334 | .compat_setsockopt = compat_ipv6_setsockopt, |
1335 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1336 | #endif |
1da177e4 LT |
1337 | }; |
1338 | ||
1339 | /* | |
1340 | * TCP over IPv4 via INET6 API | |
1341 | */ | |
1342 | ||
8292a17a | 1343 | static struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1344 | .queue_xmit = ip_queue_xmit, |
1345 | .send_check = tcp_v4_send_check, | |
1346 | .rebuild_header = inet_sk_rebuild_header, | |
1347 | .conn_request = tcp_v6_conn_request, | |
1348 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1349 | .remember_stamp = tcp_v4_remember_stamp, | |
1350 | .net_header_len = sizeof(struct iphdr), | |
1351 | .setsockopt = ipv6_setsockopt, | |
1352 | .getsockopt = ipv6_getsockopt, | |
1353 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1354 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1355 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1356 | .compat_setsockopt = compat_ipv6_setsockopt, |
1357 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1358 | #endif |
1da177e4 LT |
1359 | }; |
1360 | ||
1da177e4 LT |
1361 | /* NOTE: A lot of things set to zero explicitly by call to |
1362 | * sk_alloc() so need not be done here. | |
1363 | */ | |
1364 | static int tcp_v6_init_sock(struct sock *sk) | |
1365 | { | |
6687e988 | 1366 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1367 | struct tcp_sock *tp = tcp_sk(sk); |
1368 | ||
1369 | skb_queue_head_init(&tp->out_of_order_queue); | |
1370 | tcp_init_xmit_timers(sk); | |
1371 | tcp_prequeue_init(tp); | |
1372 | ||
6687e988 | 1373 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1374 | tp->mdev = TCP_TIMEOUT_INIT; |
1375 | ||
1376 | /* So many TCP implementations out there (incorrectly) count the | |
1377 | * initial SYN frame in their delayed-ACK and congestion control | |
1378 | * algorithms that we must have the following bandaid to talk | |
1379 | * efficiently to them. -DaveM | |
1380 | */ | |
1381 | tp->snd_cwnd = 2; | |
1382 | ||
1383 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1384 | * initialization of these values. | |
1385 | */ | |
1386 | tp->snd_ssthresh = 0x7fffffff; | |
1387 | tp->snd_cwnd_clamp = ~0; | |
c1b4a7e6 | 1388 | tp->mss_cache = 536; |
1da177e4 LT |
1389 | |
1390 | tp->reordering = sysctl_tcp_reordering; | |
1391 | ||
1392 | sk->sk_state = TCP_CLOSE; | |
1393 | ||
8292a17a | 1394 | icsk->icsk_af_ops = &ipv6_specific; |
6687e988 | 1395 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
d83d8461 | 1396 | icsk->icsk_sync_mss = tcp_sync_mss; |
1da177e4 LT |
1397 | sk->sk_write_space = sk_stream_write_space; |
1398 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1399 | ||
1400 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; | |
1401 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1402 | ||
1403 | atomic_inc(&tcp_sockets_allocated); | |
1404 | ||
1405 | return 0; | |
1406 | } | |
1407 | ||
1408 | static int tcp_v6_destroy_sock(struct sock *sk) | |
1409 | { | |
1da177e4 LT |
1410 | tcp_v4_destroy_sock(sk); |
1411 | return inet6_destroy_sock(sk); | |
1412 | } | |
1413 | ||
1414 | /* Proc filesystem TCPv6 sock list dumping. */ | |
1415 | static void get_openreq6(struct seq_file *seq, | |
60236fdd | 1416 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 1417 | { |
1da177e4 | 1418 | int ttd = req->expires - jiffies; |
ca304b61 ACM |
1419 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1420 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1421 | |
1422 | if (ttd < 0) | |
1423 | ttd = 0; | |
1424 | ||
1da177e4 LT |
1425 | seq_printf(seq, |
1426 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1427 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1428 | i, | |
1429 | src->s6_addr32[0], src->s6_addr32[1], | |
1430 | src->s6_addr32[2], src->s6_addr32[3], | |
1431 | ntohs(inet_sk(sk)->sport), | |
1432 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1433 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1434 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1435 | TCP_SYN_RECV, |
1436 | 0,0, /* could print option size, but that is af dependent. */ | |
1437 | 1, /* timers active (only the expire timer) */ | |
1438 | jiffies_to_clock_t(ttd), | |
1439 | req->retrans, | |
1440 | uid, | |
1441 | 0, /* non standard timer */ | |
1442 | 0, /* open_requests have no inode */ | |
1443 | 0, req); | |
1444 | } | |
1445 | ||
1446 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1447 | { | |
1448 | struct in6_addr *dest, *src; | |
1449 | __u16 destp, srcp; | |
1450 | int timer_active; | |
1451 | unsigned long timer_expires; | |
1452 | struct inet_sock *inet = inet_sk(sp); | |
1453 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1454 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
1455 | struct ipv6_pinfo *np = inet6_sk(sp); |
1456 | ||
1457 | dest = &np->daddr; | |
1458 | src = &np->rcv_saddr; | |
1459 | destp = ntohs(inet->dport); | |
1460 | srcp = ntohs(inet->sport); | |
463c84b9 ACM |
1461 | |
1462 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1463 | timer_active = 1; |
463c84b9 ACM |
1464 | timer_expires = icsk->icsk_timeout; |
1465 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1466 | timer_active = 4; |
463c84b9 | 1467 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1468 | } else if (timer_pending(&sp->sk_timer)) { |
1469 | timer_active = 2; | |
1470 | timer_expires = sp->sk_timer.expires; | |
1471 | } else { | |
1472 | timer_active = 0; | |
1473 | timer_expires = jiffies; | |
1474 | } | |
1475 | ||
1476 | seq_printf(seq, | |
1477 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1478 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n", | |
1479 | i, | |
1480 | src->s6_addr32[0], src->s6_addr32[1], | |
1481 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1482 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1483 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1484 | sp->sk_state, | |
47da8ee6 SS |
1485 | tp->write_seq-tp->snd_una, |
1486 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 LT |
1487 | timer_active, |
1488 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 1489 | icsk->icsk_retransmits, |
1da177e4 | 1490 | sock_i_uid(sp), |
6687e988 | 1491 | icsk->icsk_probes_out, |
1da177e4 LT |
1492 | sock_i_ino(sp), |
1493 | atomic_read(&sp->sk_refcnt), sp, | |
463c84b9 ACM |
1494 | icsk->icsk_rto, |
1495 | icsk->icsk_ack.ato, | |
1496 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, | |
1da177e4 LT |
1497 | tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh |
1498 | ); | |
1499 | } | |
1500 | ||
1501 | static void get_timewait6_sock(struct seq_file *seq, | |
8feaf0c0 | 1502 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
1503 | { |
1504 | struct in6_addr *dest, *src; | |
1505 | __u16 destp, srcp; | |
0fa1a53e | 1506 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
1507 | int ttd = tw->tw_ttd - jiffies; |
1508 | ||
1509 | if (ttd < 0) | |
1510 | ttd = 0; | |
1511 | ||
0fa1a53e ACM |
1512 | dest = &tw6->tw_v6_daddr; |
1513 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
1514 | destp = ntohs(tw->tw_dport); |
1515 | srcp = ntohs(tw->tw_sport); | |
1516 | ||
1517 | seq_printf(seq, | |
1518 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1519 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1520 | i, | |
1521 | src->s6_addr32[0], src->s6_addr32[1], | |
1522 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1523 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1524 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1525 | tw->tw_substate, 0, 0, | |
1526 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
1527 | atomic_read(&tw->tw_refcnt), tw); | |
1528 | } | |
1529 | ||
1530 | #ifdef CONFIG_PROC_FS | |
1531 | static int tcp6_seq_show(struct seq_file *seq, void *v) | |
1532 | { | |
1533 | struct tcp_iter_state *st; | |
1534 | ||
1535 | if (v == SEQ_START_TOKEN) { | |
1536 | seq_puts(seq, | |
1537 | " sl " | |
1538 | "local_address " | |
1539 | "remote_address " | |
1540 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1541 | " uid timeout inode\n"); | |
1542 | goto out; | |
1543 | } | |
1544 | st = seq->private; | |
1545 | ||
1546 | switch (st->state) { | |
1547 | case TCP_SEQ_STATE_LISTENING: | |
1548 | case TCP_SEQ_STATE_ESTABLISHED: | |
1549 | get_tcp6_sock(seq, v, st->num); | |
1550 | break; | |
1551 | case TCP_SEQ_STATE_OPENREQ: | |
1552 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
1553 | break; | |
1554 | case TCP_SEQ_STATE_TIME_WAIT: | |
1555 | get_timewait6_sock(seq, v, st->num); | |
1556 | break; | |
1557 | } | |
1558 | out: | |
1559 | return 0; | |
1560 | } | |
1561 | ||
1562 | static struct file_operations tcp6_seq_fops; | |
1563 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { | |
1564 | .owner = THIS_MODULE, | |
1565 | .name = "tcp6", | |
1566 | .family = AF_INET6, | |
1567 | .seq_show = tcp6_seq_show, | |
1568 | .seq_fops = &tcp6_seq_fops, | |
1569 | }; | |
1570 | ||
1571 | int __init tcp6_proc_init(void) | |
1572 | { | |
1573 | return tcp_proc_register(&tcp6_seq_afinfo); | |
1574 | } | |
1575 | ||
1576 | void tcp6_proc_exit(void) | |
1577 | { | |
1578 | tcp_proc_unregister(&tcp6_seq_afinfo); | |
1579 | } | |
1580 | #endif | |
1581 | ||
1582 | struct proto tcpv6_prot = { | |
1583 | .name = "TCPv6", | |
1584 | .owner = THIS_MODULE, | |
1585 | .close = tcp_close, | |
1586 | .connect = tcp_v6_connect, | |
1587 | .disconnect = tcp_disconnect, | |
463c84b9 | 1588 | .accept = inet_csk_accept, |
1da177e4 LT |
1589 | .ioctl = tcp_ioctl, |
1590 | .init = tcp_v6_init_sock, | |
1591 | .destroy = tcp_v6_destroy_sock, | |
1592 | .shutdown = tcp_shutdown, | |
1593 | .setsockopt = tcp_setsockopt, | |
1594 | .getsockopt = tcp_getsockopt, | |
1595 | .sendmsg = tcp_sendmsg, | |
1596 | .recvmsg = tcp_recvmsg, | |
1597 | .backlog_rcv = tcp_v6_do_rcv, | |
1598 | .hash = tcp_v6_hash, | |
1599 | .unhash = tcp_unhash, | |
1600 | .get_port = tcp_v6_get_port, | |
1601 | .enter_memory_pressure = tcp_enter_memory_pressure, | |
1602 | .sockets_allocated = &tcp_sockets_allocated, | |
1603 | .memory_allocated = &tcp_memory_allocated, | |
1604 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1605 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
1606 | .sysctl_mem = sysctl_tcp_mem, |
1607 | .sysctl_wmem = sysctl_tcp_wmem, | |
1608 | .sysctl_rmem = sysctl_tcp_rmem, | |
1609 | .max_header = MAX_TCP_HEADER, | |
1610 | .obj_size = sizeof(struct tcp6_sock), | |
6d6ee43e | 1611 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1612 | .rsk_prot = &tcp6_request_sock_ops, |
543d9cfe ACM |
1613 | #ifdef CONFIG_COMPAT |
1614 | .compat_setsockopt = compat_tcp_setsockopt, | |
1615 | .compat_getsockopt = compat_tcp_getsockopt, | |
1616 | #endif | |
1da177e4 LT |
1617 | }; |
1618 | ||
1619 | static struct inet6_protocol tcpv6_protocol = { | |
1620 | .handler = tcp_v6_rcv, | |
1621 | .err_handler = tcp_v6_err, | |
a430a43d | 1622 | .gso_send_check = tcp_v6_gso_send_check, |
adcfc7d0 | 1623 | .gso_segment = tcp_tso_segment, |
1da177e4 LT |
1624 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
1625 | }; | |
1626 | ||
1da177e4 LT |
1627 | static struct inet_protosw tcpv6_protosw = { |
1628 | .type = SOCK_STREAM, | |
1629 | .protocol = IPPROTO_TCP, | |
1630 | .prot = &tcpv6_prot, | |
1631 | .ops = &inet6_stream_ops, | |
1632 | .capability = -1, | |
1633 | .no_check = 0, | |
d83d8461 ACM |
1634 | .flags = INET_PROTOSW_PERMANENT | |
1635 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
1636 | }; |
1637 | ||
1638 | void __init tcpv6_init(void) | |
1639 | { | |
1640 | /* register inet6 protocol */ | |
1641 | if (inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP) < 0) | |
1642 | printk(KERN_ERR "tcpv6_init: Could not register protocol\n"); | |
1643 | inet6_register_protosw(&tcpv6_protosw); | |
ae0f7d5f | 1644 | |
c4d93909 ACM |
1645 | if (inet_csk_ctl_sock_create(&tcp6_socket, PF_INET6, SOCK_RAW, |
1646 | IPPROTO_TCP) < 0) | |
ae0f7d5f | 1647 | panic("Failed to create the TCPv6 control socket.\n"); |
1da177e4 | 1648 | } |