Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * TCP over IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * |
8 | * $Id: tcp_ipv6.c,v 1.144 2002/02/01 22:01:04 davem Exp $ | |
9 | * | |
1ab1457c | 10 | * Based on: |
1da177e4 LT |
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> | |
1da177e4 LT |
59 | #include <net/snmp.h> |
60 | #include <net/dsfield.h> | |
6d6ee43e | 61 | #include <net/timewait_sock.h> |
1da177e4 LT |
62 | |
63 | #include <asm/uaccess.h> | |
64 | ||
65 | #include <linux/proc_fs.h> | |
66 | #include <linux/seq_file.h> | |
67 | ||
cfb6eeb4 YH |
68 | #include <linux/crypto.h> |
69 | #include <linux/scatterlist.h> | |
70 | ||
ae0f7d5f DW |
71 | /* Socket used for sending RSTs and ACKs */ |
72 | static struct socket *tcp6_socket; | |
73 | ||
cfb6eeb4 | 74 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
60236fdd | 75 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req); |
1ab1457c | 76 | static void tcp_v6_send_check(struct sock *sk, int len, |
1da177e4 LT |
77 | struct sk_buff *skb); |
78 | ||
79 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 80 | |
8292a17a ACM |
81 | static struct inet_connection_sock_af_ops ipv6_mapped; |
82 | static struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 83 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
84 | static struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
85 | static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
a928630a | 86 | #endif |
1da177e4 | 87 | |
1da177e4 LT |
88 | static int tcp_v6_get_port(struct sock *sk, unsigned short snum) |
89 | { | |
971af18b ACM |
90 | return inet_csk_get_port(&tcp_hashinfo, sk, snum, |
91 | inet6_csk_bind_conflict); | |
1da177e4 LT |
92 | } |
93 | ||
1da177e4 LT |
94 | static void tcp_v6_hash(struct sock *sk) |
95 | { | |
96 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 97 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
98 | tcp_prot.hash(sk); |
99 | return; | |
100 | } | |
101 | local_bh_disable(); | |
90b19d31 | 102 | __inet6_hash(&tcp_hashinfo, sk); |
1da177e4 LT |
103 | local_bh_enable(); |
104 | } | |
105 | } | |
106 | ||
868c86bc | 107 | static __inline__ __sum16 tcp_v6_check(struct tcphdr *th, int len, |
1ab1457c YH |
108 | struct in6_addr *saddr, |
109 | struct in6_addr *daddr, | |
868c86bc | 110 | __wsum base) |
1da177e4 LT |
111 | { |
112 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
113 | } | |
114 | ||
a94f723d | 115 | static __u32 tcp_v6_init_sequence(struct sk_buff *skb) |
1da177e4 | 116 | { |
0660e03f ACM |
117 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
118 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
119 | tcp_hdr(skb)->dest, |
120 | tcp_hdr(skb)->source); | |
1da177e4 LT |
121 | } |
122 | ||
1ab1457c | 123 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
124 | int addr_len) |
125 | { | |
126 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 127 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 128 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
129 | struct ipv6_pinfo *np = inet6_sk(sk); |
130 | struct tcp_sock *tp = tcp_sk(sk); | |
131 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
132 | struct flowi fl; | |
133 | struct dst_entry *dst; | |
134 | int addr_type; | |
135 | int err; | |
136 | ||
1ab1457c | 137 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
138 | return -EINVAL; |
139 | ||
1ab1457c | 140 | if (usin->sin6_family != AF_INET6) |
1da177e4 LT |
141 | return(-EAFNOSUPPORT); |
142 | ||
143 | memset(&fl, 0, sizeof(fl)); | |
144 | ||
145 | if (np->sndflow) { | |
146 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
147 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
148 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
149 | struct ip6_flowlabel *flowlabel; | |
150 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
151 | if (flowlabel == NULL) | |
152 | return -EINVAL; | |
153 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
154 | fl6_sock_release(flowlabel); | |
155 | } | |
156 | } | |
157 | ||
158 | /* | |
1ab1457c YH |
159 | * connect() to INADDR_ANY means loopback (BSD'ism). |
160 | */ | |
161 | ||
162 | if(ipv6_addr_any(&usin->sin6_addr)) | |
163 | usin->sin6_addr.s6_addr[15] = 0x1; | |
1da177e4 LT |
164 | |
165 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
166 | ||
167 | if(addr_type & IPV6_ADDR_MULTICAST) | |
168 | return -ENETUNREACH; | |
169 | ||
170 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
171 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
172 | usin->sin6_scope_id) { | |
173 | /* If interface is set while binding, indices | |
174 | * must coincide. | |
175 | */ | |
176 | if (sk->sk_bound_dev_if && | |
177 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
178 | return -EINVAL; | |
179 | ||
180 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
181 | } | |
182 | ||
183 | /* Connect to link-local address requires an interface */ | |
184 | if (!sk->sk_bound_dev_if) | |
185 | return -EINVAL; | |
186 | } | |
187 | ||
188 | if (tp->rx_opt.ts_recent_stamp && | |
189 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
190 | tp->rx_opt.ts_recent = 0; | |
191 | tp->rx_opt.ts_recent_stamp = 0; | |
192 | tp->write_seq = 0; | |
193 | } | |
194 | ||
195 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
196 | np->flow_label = fl.fl6_flowlabel; | |
197 | ||
198 | /* | |
199 | * TCP over IPv4 | |
200 | */ | |
201 | ||
202 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 203 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
204 | struct sockaddr_in sin; |
205 | ||
206 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
207 | ||
208 | if (__ipv6_only_sock(sk)) | |
209 | return -ENETUNREACH; | |
210 | ||
211 | sin.sin_family = AF_INET; | |
212 | sin.sin_port = usin->sin6_port; | |
213 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
214 | ||
d83d8461 | 215 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 216 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
217 | #ifdef CONFIG_TCP_MD5SIG |
218 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
219 | #endif | |
1da177e4 LT |
220 | |
221 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
222 | ||
223 | if (err) { | |
d83d8461 ACM |
224 | icsk->icsk_ext_hdr_len = exthdrlen; |
225 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 226 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
227 | #ifdef CONFIG_TCP_MD5SIG |
228 | tp->af_specific = &tcp_sock_ipv6_specific; | |
229 | #endif | |
1da177e4 LT |
230 | goto failure; |
231 | } else { | |
232 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
233 | inet->saddr); | |
234 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
235 | inet->rcv_saddr); | |
236 | } | |
237 | ||
238 | return err; | |
239 | } | |
240 | ||
241 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
242 | saddr = &np->rcv_saddr; | |
243 | ||
244 | fl.proto = IPPROTO_TCP; | |
245 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
246 | ipv6_addr_copy(&fl.fl6_src, | |
247 | (saddr ? saddr : &np->saddr)); | |
248 | fl.oif = sk->sk_bound_dev_if; | |
249 | fl.fl_ip_dport = usin->sin6_port; | |
250 | fl.fl_ip_sport = inet->sport; | |
251 | ||
252 | if (np->opt && np->opt->srcrt) { | |
253 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
254 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
255 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
256 | final_p = &final; | |
257 | } | |
258 | ||
beb8d13b VY |
259 | security_sk_classify_flow(sk, &fl); |
260 | ||
1da177e4 LT |
261 | err = ip6_dst_lookup(sk, &dst, &fl); |
262 | if (err) | |
263 | goto failure; | |
264 | if (final_p) | |
265 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
266 | ||
14e50e57 DM |
267 | if ((err = __xfrm_lookup(&dst, &fl, sk, 1)) < 0) { |
268 | if (err == -EREMOTE) | |
269 | err = ip6_dst_blackhole(sk, &dst, &fl); | |
270 | if (err < 0) | |
271 | goto failure; | |
272 | } | |
1da177e4 LT |
273 | |
274 | if (saddr == NULL) { | |
275 | saddr = &fl.fl6_src; | |
276 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
277 | } | |
278 | ||
279 | /* set the source address */ | |
280 | ipv6_addr_copy(&np->saddr, saddr); | |
281 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
282 | ||
f83ef8c0 | 283 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 284 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 285 | |
d83d8461 | 286 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 287 | if (np->opt) |
d83d8461 ACM |
288 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
289 | np->opt->opt_nflen); | |
1da177e4 LT |
290 | |
291 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
292 | ||
293 | inet->dport = usin->sin6_port; | |
294 | ||
295 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 296 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
297 | if (err) |
298 | goto late_failure; | |
299 | ||
300 | if (!tp->write_seq) | |
301 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
302 | np->daddr.s6_addr32, | |
303 | inet->sport, | |
304 | inet->dport); | |
305 | ||
306 | err = tcp_connect(sk); | |
307 | if (err) | |
308 | goto late_failure; | |
309 | ||
310 | return 0; | |
311 | ||
312 | late_failure: | |
313 | tcp_set_state(sk, TCP_CLOSE); | |
314 | __sk_dst_reset(sk); | |
315 | failure: | |
316 | inet->dport = 0; | |
317 | sk->sk_route_caps = 0; | |
318 | return err; | |
319 | } | |
320 | ||
321 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
04ce6909 | 322 | int type, int code, int offset, __be32 info) |
1da177e4 LT |
323 | { |
324 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
505cbfc5 | 325 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
326 | struct ipv6_pinfo *np; |
327 | struct sock *sk; | |
328 | int err; | |
1ab1457c | 329 | struct tcp_sock *tp; |
1da177e4 LT |
330 | __u32 seq; |
331 | ||
505cbfc5 ACM |
332 | sk = inet6_lookup(&tcp_hashinfo, &hdr->daddr, th->dest, &hdr->saddr, |
333 | th->source, skb->dev->ifindex); | |
1da177e4 LT |
334 | |
335 | if (sk == NULL) { | |
336 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
337 | return; | |
338 | } | |
339 | ||
340 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 341 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
342 | return; |
343 | } | |
344 | ||
345 | bh_lock_sock(sk); | |
346 | if (sock_owned_by_user(sk)) | |
347 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
348 | ||
349 | if (sk->sk_state == TCP_CLOSE) | |
350 | goto out; | |
351 | ||
352 | tp = tcp_sk(sk); | |
1ab1457c | 353 | seq = ntohl(th->seq); |
1da177e4 LT |
354 | if (sk->sk_state != TCP_LISTEN && |
355 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
356 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
357 | goto out; | |
358 | } | |
359 | ||
360 | np = inet6_sk(sk); | |
361 | ||
362 | if (type == ICMPV6_PKT_TOOBIG) { | |
363 | struct dst_entry *dst = NULL; | |
364 | ||
365 | if (sock_owned_by_user(sk)) | |
366 | goto out; | |
367 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
368 | goto out; | |
369 | ||
370 | /* icmp should have updated the destination cache entry */ | |
371 | dst = __sk_dst_check(sk, np->dst_cookie); | |
372 | ||
373 | if (dst == NULL) { | |
374 | struct inet_sock *inet = inet_sk(sk); | |
375 | struct flowi fl; | |
376 | ||
377 | /* BUGGG_FUTURE: Again, it is not clear how | |
378 | to handle rthdr case. Ignore this complexity | |
379 | for now. | |
380 | */ | |
381 | memset(&fl, 0, sizeof(fl)); | |
382 | fl.proto = IPPROTO_TCP; | |
383 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
384 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
385 | fl.oif = sk->sk_bound_dev_if; | |
386 | fl.fl_ip_dport = inet->dport; | |
387 | fl.fl_ip_sport = inet->sport; | |
beb8d13b | 388 | security_skb_classify_flow(skb, &fl); |
1da177e4 LT |
389 | |
390 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
391 | sk->sk_err_soft = -err; | |
392 | goto out; | |
393 | } | |
394 | ||
395 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
396 | sk->sk_err_soft = -err; | |
397 | goto out; | |
398 | } | |
399 | ||
400 | } else | |
401 | dst_hold(dst); | |
402 | ||
d83d8461 | 403 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
1da177e4 LT |
404 | tcp_sync_mss(sk, dst_mtu(dst)); |
405 | tcp_simple_retransmit(sk); | |
406 | } /* else let the usual retransmit timer handle it */ | |
407 | dst_release(dst); | |
408 | goto out; | |
409 | } | |
410 | ||
411 | icmpv6_err_convert(type, code, &err); | |
412 | ||
60236fdd | 413 | /* Might be for an request_sock */ |
1da177e4 | 414 | switch (sk->sk_state) { |
60236fdd | 415 | struct request_sock *req, **prev; |
1da177e4 LT |
416 | case TCP_LISTEN: |
417 | if (sock_owned_by_user(sk)) | |
418 | goto out; | |
419 | ||
8129765a ACM |
420 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
421 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
422 | if (!req) |
423 | goto out; | |
424 | ||
425 | /* ICMPs are not backlogged, hence we cannot get | |
426 | * an established socket here. | |
427 | */ | |
428 | BUG_TRAP(req->sk == NULL); | |
429 | ||
2e6599cb | 430 | if (seq != tcp_rsk(req)->snt_isn) { |
1da177e4 LT |
431 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
432 | goto out; | |
433 | } | |
434 | ||
463c84b9 | 435 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
436 | goto out; |
437 | ||
438 | case TCP_SYN_SENT: | |
439 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 440 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 441 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
442 | sk->sk_err = err; |
443 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
444 | ||
445 | tcp_done(sk); | |
446 | } else | |
447 | sk->sk_err_soft = err; | |
448 | goto out; | |
449 | } | |
450 | ||
451 | if (!sock_owned_by_user(sk) && np->recverr) { | |
452 | sk->sk_err = err; | |
453 | sk->sk_error_report(sk); | |
454 | } else | |
455 | sk->sk_err_soft = err; | |
456 | ||
457 | out: | |
458 | bh_unlock_sock(sk); | |
459 | sock_put(sk); | |
460 | } | |
461 | ||
462 | ||
60236fdd | 463 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, |
1da177e4 LT |
464 | struct dst_entry *dst) |
465 | { | |
ca304b61 | 466 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
467 | struct ipv6_pinfo *np = inet6_sk(sk); |
468 | struct sk_buff * skb; | |
469 | struct ipv6_txoptions *opt = NULL; | |
470 | struct in6_addr * final_p = NULL, final; | |
471 | struct flowi fl; | |
472 | int err = -1; | |
473 | ||
474 | memset(&fl, 0, sizeof(fl)); | |
475 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
476 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
477 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 478 | fl.fl6_flowlabel = 0; |
2e6599cb ACM |
479 | fl.oif = treq->iif; |
480 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
1da177e4 | 481 | fl.fl_ip_sport = inet_sk(sk)->sport; |
4237c75c | 482 | security_req_classify_flow(req, &fl); |
1da177e4 LT |
483 | |
484 | if (dst == NULL) { | |
485 | opt = np->opt; | |
1da177e4 LT |
486 | if (opt && opt->srcrt) { |
487 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
488 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
489 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
490 | final_p = &final; | |
491 | } | |
492 | ||
493 | err = ip6_dst_lookup(sk, &dst, &fl); | |
494 | if (err) | |
495 | goto done; | |
496 | if (final_p) | |
497 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
498 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
499 | goto done; | |
500 | } | |
501 | ||
502 | skb = tcp_make_synack(sk, dst, req); | |
503 | if (skb) { | |
aa8223c7 | 504 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
505 | |
506 | th->check = tcp_v6_check(th, skb->len, | |
2e6599cb | 507 | &treq->loc_addr, &treq->rmt_addr, |
1da177e4 LT |
508 | csum_partial((char *)th, skb->len, skb->csum)); |
509 | ||
2e6599cb | 510 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 | 511 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
b9df3cb8 | 512 | err = net_xmit_eval(err); |
1da177e4 LT |
513 | } |
514 | ||
515 | done: | |
1ab1457c | 516 | if (opt && opt != np->opt) |
1da177e4 | 517 | sock_kfree_s(sk, opt, opt->tot_len); |
78b91042 | 518 | dst_release(dst); |
1da177e4 LT |
519 | return err; |
520 | } | |
521 | ||
60236fdd | 522 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 523 | { |
ca304b61 ACM |
524 | if (inet6_rsk(req)->pktopts) |
525 | kfree_skb(inet6_rsk(req)->pktopts); | |
1da177e4 LT |
526 | } |
527 | ||
cfb6eeb4 YH |
528 | #ifdef CONFIG_TCP_MD5SIG |
529 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
530 | struct in6_addr *addr) | |
531 | { | |
532 | struct tcp_sock *tp = tcp_sk(sk); | |
533 | int i; | |
534 | ||
535 | BUG_ON(tp == NULL); | |
536 | ||
537 | if (!tp->md5sig_info || !tp->md5sig_info->entries6) | |
538 | return NULL; | |
539 | ||
540 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
541 | if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, addr) == 0) | |
f8ab18d2 | 542 | return &tp->md5sig_info->keys6[i].base; |
cfb6eeb4 YH |
543 | } |
544 | return NULL; | |
545 | } | |
546 | ||
547 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
548 | struct sock *addr_sk) | |
549 | { | |
550 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); | |
551 | } | |
552 | ||
553 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
554 | struct request_sock *req) | |
555 | { | |
556 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
557 | } | |
558 | ||
559 | static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer, | |
560 | char *newkey, u8 newkeylen) | |
561 | { | |
562 | /* Add key to the list */ | |
563 | struct tcp6_md5sig_key *key; | |
564 | struct tcp_sock *tp = tcp_sk(sk); | |
565 | struct tcp6_md5sig_key *keys; | |
566 | ||
567 | key = (struct tcp6_md5sig_key*) tcp_v6_md5_do_lookup(sk, peer); | |
568 | if (key) { | |
569 | /* modify existing entry - just update that one */ | |
f8ab18d2 DM |
570 | kfree(key->base.key); |
571 | key->base.key = newkey; | |
572 | key->base.keylen = newkeylen; | |
cfb6eeb4 YH |
573 | } else { |
574 | /* reallocate new list if current one is full. */ | |
575 | if (!tp->md5sig_info) { | |
576 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC); | |
577 | if (!tp->md5sig_info) { | |
578 | kfree(newkey); | |
579 | return -ENOMEM; | |
580 | } | |
3d7dbeac | 581 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 YH |
582 | } |
583 | tcp_alloc_md5sig_pool(); | |
584 | if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) { | |
585 | keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) * | |
586 | (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC); | |
587 | ||
588 | if (!keys) { | |
589 | tcp_free_md5sig_pool(); | |
590 | kfree(newkey); | |
591 | return -ENOMEM; | |
592 | } | |
593 | ||
594 | if (tp->md5sig_info->entries6) | |
595 | memmove(keys, tp->md5sig_info->keys6, | |
596 | (sizeof (tp->md5sig_info->keys6[0]) * | |
597 | tp->md5sig_info->entries6)); | |
598 | ||
599 | kfree(tp->md5sig_info->keys6); | |
600 | tp->md5sig_info->keys6 = keys; | |
601 | tp->md5sig_info->alloced6++; | |
602 | } | |
603 | ||
604 | ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr, | |
605 | peer); | |
f8ab18d2 DM |
606 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey; |
607 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen; | |
cfb6eeb4 YH |
608 | |
609 | tp->md5sig_info->entries6++; | |
610 | } | |
611 | return 0; | |
612 | } | |
613 | ||
614 | static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk, | |
615 | u8 *newkey, __u8 newkeylen) | |
616 | { | |
617 | return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr, | |
618 | newkey, newkeylen); | |
619 | } | |
620 | ||
621 | static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer) | |
622 | { | |
623 | struct tcp_sock *tp = tcp_sk(sk); | |
624 | int i; | |
625 | ||
626 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
627 | if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, peer) == 0) { | |
628 | /* Free the key */ | |
f8ab18d2 | 629 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
630 | tp->md5sig_info->entries6--; |
631 | ||
632 | if (tp->md5sig_info->entries6 == 0) { | |
633 | kfree(tp->md5sig_info->keys6); | |
634 | tp->md5sig_info->keys6 = NULL; | |
ca983cef | 635 | tp->md5sig_info->alloced6 = 0; |
cfb6eeb4 YH |
636 | |
637 | tcp_free_md5sig_pool(); | |
638 | ||
639 | return 0; | |
640 | } else { | |
641 | /* shrink the database */ | |
642 | if (tp->md5sig_info->entries6 != i) | |
643 | memmove(&tp->md5sig_info->keys6[i], | |
644 | &tp->md5sig_info->keys6[i+1], | |
645 | (tp->md5sig_info->entries6 - i) | |
646 | * sizeof (tp->md5sig_info->keys6[0])); | |
647 | } | |
648 | } | |
649 | } | |
650 | return -ENOENT; | |
651 | } | |
652 | ||
653 | static void tcp_v6_clear_md5_list (struct sock *sk) | |
654 | { | |
655 | struct tcp_sock *tp = tcp_sk(sk); | |
656 | int i; | |
657 | ||
658 | if (tp->md5sig_info->entries6) { | |
659 | for (i = 0; i < tp->md5sig_info->entries6; i++) | |
f8ab18d2 | 660 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
661 | tp->md5sig_info->entries6 = 0; |
662 | tcp_free_md5sig_pool(); | |
663 | } | |
664 | ||
665 | kfree(tp->md5sig_info->keys6); | |
666 | tp->md5sig_info->keys6 = NULL; | |
667 | tp->md5sig_info->alloced6 = 0; | |
668 | ||
669 | if (tp->md5sig_info->entries4) { | |
670 | for (i = 0; i < tp->md5sig_info->entries4; i++) | |
f8ab18d2 | 671 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
672 | tp->md5sig_info->entries4 = 0; |
673 | tcp_free_md5sig_pool(); | |
674 | } | |
675 | ||
676 | kfree(tp->md5sig_info->keys4); | |
677 | tp->md5sig_info->keys4 = NULL; | |
678 | tp->md5sig_info->alloced4 = 0; | |
679 | } | |
680 | ||
681 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, | |
682 | int optlen) | |
683 | { | |
684 | struct tcp_md5sig cmd; | |
685 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
686 | u8 *newkey; | |
687 | ||
688 | if (optlen < sizeof(cmd)) | |
689 | return -EINVAL; | |
690 | ||
691 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
692 | return -EFAULT; | |
693 | ||
694 | if (sin6->sin6_family != AF_INET6) | |
695 | return -EINVAL; | |
696 | ||
697 | if (!cmd.tcpm_keylen) { | |
698 | if (!tcp_sk(sk)->md5sig_info) | |
699 | return -ENOENT; | |
e773e4fa | 700 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
cfb6eeb4 YH |
701 | return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]); |
702 | return tcp_v6_md5_do_del(sk, &sin6->sin6_addr); | |
703 | } | |
704 | ||
705 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
706 | return -EINVAL; | |
707 | ||
708 | if (!tcp_sk(sk)->md5sig_info) { | |
709 | struct tcp_sock *tp = tcp_sk(sk); | |
710 | struct tcp_md5sig_info *p; | |
711 | ||
712 | p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL); | |
713 | if (!p) | |
714 | return -ENOMEM; | |
715 | ||
716 | tp->md5sig_info = p; | |
3d7dbeac | 717 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 YH |
718 | } |
719 | ||
af879cc7 | 720 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
721 | if (!newkey) |
722 | return -ENOMEM; | |
e773e4fa | 723 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { |
cfb6eeb4 YH |
724 | return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3], |
725 | newkey, cmd.tcpm_keylen); | |
726 | } | |
727 | return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen); | |
728 | } | |
729 | ||
730 | static int tcp_v6_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, | |
731 | struct in6_addr *saddr, | |
732 | struct in6_addr *daddr, | |
733 | struct tcphdr *th, int protocol, | |
734 | int tcplen) | |
735 | { | |
736 | struct scatterlist sg[4]; | |
737 | __u16 data_len; | |
738 | int block = 0; | |
8e5200f5 | 739 | __sum16 cksum; |
cfb6eeb4 YH |
740 | struct tcp_md5sig_pool *hp; |
741 | struct tcp6_pseudohdr *bp; | |
742 | struct hash_desc *desc; | |
743 | int err; | |
744 | unsigned int nbytes = 0; | |
745 | ||
746 | hp = tcp_get_md5sig_pool(); | |
747 | if (!hp) { | |
748 | printk(KERN_WARNING "%s(): hash pool not found...\n", __FUNCTION__); | |
749 | goto clear_hash_noput; | |
750 | } | |
751 | bp = &hp->md5_blk.ip6; | |
752 | desc = &hp->md5_desc; | |
753 | ||
754 | /* 1. TCP pseudo-header (RFC2460) */ | |
755 | ipv6_addr_copy(&bp->saddr, saddr); | |
756 | ipv6_addr_copy(&bp->daddr, daddr); | |
757 | bp->len = htonl(tcplen); | |
758 | bp->protocol = htonl(protocol); | |
759 | ||
760 | sg_set_buf(&sg[block++], bp, sizeof(*bp)); | |
761 | nbytes += sizeof(*bp); | |
762 | ||
763 | /* 2. TCP header, excluding options */ | |
764 | cksum = th->check; | |
765 | th->check = 0; | |
766 | sg_set_buf(&sg[block++], th, sizeof(*th)); | |
767 | nbytes += sizeof(*th); | |
768 | ||
769 | /* 3. TCP segment data (if any) */ | |
770 | data_len = tcplen - (th->doff << 2); | |
771 | if (data_len > 0) { | |
772 | u8 *data = (u8 *)th + (th->doff << 2); | |
773 | sg_set_buf(&sg[block++], data, data_len); | |
774 | nbytes += data_len; | |
775 | } | |
776 | ||
777 | /* 4. shared key */ | |
778 | sg_set_buf(&sg[block++], key->key, key->keylen); | |
779 | nbytes += key->keylen; | |
780 | ||
781 | /* Now store the hash into the packet */ | |
782 | err = crypto_hash_init(desc); | |
783 | if (err) { | |
784 | printk(KERN_WARNING "%s(): hash_init failed\n", __FUNCTION__); | |
785 | goto clear_hash; | |
786 | } | |
787 | err = crypto_hash_update(desc, sg, nbytes); | |
788 | if (err) { | |
789 | printk(KERN_WARNING "%s(): hash_update failed\n", __FUNCTION__); | |
790 | goto clear_hash; | |
791 | } | |
792 | err = crypto_hash_final(desc, md5_hash); | |
793 | if (err) { | |
794 | printk(KERN_WARNING "%s(): hash_final failed\n", __FUNCTION__); | |
795 | goto clear_hash; | |
796 | } | |
797 | ||
798 | /* Reset header, and free up the crypto */ | |
799 | tcp_put_md5sig_pool(); | |
800 | th->check = cksum; | |
801 | out: | |
802 | return 0; | |
803 | clear_hash: | |
804 | tcp_put_md5sig_pool(); | |
805 | clear_hash_noput: | |
806 | memset(md5_hash, 0, 16); | |
807 | goto out; | |
808 | } | |
809 | ||
810 | static int tcp_v6_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, | |
811 | struct sock *sk, | |
812 | struct dst_entry *dst, | |
813 | struct request_sock *req, | |
814 | struct tcphdr *th, int protocol, | |
815 | int tcplen) | |
816 | { | |
817 | struct in6_addr *saddr, *daddr; | |
818 | ||
819 | if (sk) { | |
820 | saddr = &inet6_sk(sk)->saddr; | |
821 | daddr = &inet6_sk(sk)->daddr; | |
822 | } else { | |
823 | saddr = &inet6_rsk(req)->loc_addr; | |
824 | daddr = &inet6_rsk(req)->rmt_addr; | |
825 | } | |
826 | return tcp_v6_do_calc_md5_hash(md5_hash, key, | |
827 | saddr, daddr, | |
828 | th, protocol, tcplen); | |
829 | } | |
830 | ||
831 | static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb) | |
832 | { | |
833 | __u8 *hash_location = NULL; | |
834 | struct tcp_md5sig_key *hash_expected; | |
0660e03f | 835 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
aa8223c7 | 836 | struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
837 | int length = (th->doff << 2) - sizeof (*th); |
838 | int genhash; | |
839 | u8 *ptr; | |
840 | u8 newhash[16]; | |
841 | ||
842 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
843 | ||
844 | /* If the TCP option is too short, we can short cut */ | |
845 | if (length < TCPOLEN_MD5SIG) | |
846 | return hash_expected ? 1 : 0; | |
847 | ||
848 | /* parse options */ | |
849 | ptr = (u8*)(th + 1); | |
850 | while (length > 0) { | |
851 | int opcode = *ptr++; | |
852 | int opsize; | |
853 | ||
854 | switch(opcode) { | |
855 | case TCPOPT_EOL: | |
856 | goto done_opts; | |
857 | case TCPOPT_NOP: | |
858 | length--; | |
859 | continue; | |
860 | default: | |
861 | opsize = *ptr++; | |
862 | if (opsize < 2 || opsize > length) | |
863 | goto done_opts; | |
864 | if (opcode == TCPOPT_MD5SIG) { | |
865 | hash_location = ptr; | |
866 | goto done_opts; | |
867 | } | |
868 | } | |
869 | ptr += opsize - 2; | |
870 | length -= opsize; | |
871 | } | |
872 | ||
873 | done_opts: | |
874 | /* do we have a hash as expected? */ | |
875 | if (!hash_expected) { | |
876 | if (!hash_location) | |
877 | return 0; | |
878 | if (net_ratelimit()) { | |
879 | printk(KERN_INFO "MD5 Hash NOT expected but found " | |
880 | "(" NIP6_FMT ", %u)->" | |
881 | "(" NIP6_FMT ", %u)\n", | |
882 | NIP6(ip6h->saddr), ntohs(th->source), | |
883 | NIP6(ip6h->daddr), ntohs(th->dest)); | |
884 | } | |
885 | return 1; | |
886 | } | |
887 | ||
888 | if (!hash_location) { | |
889 | if (net_ratelimit()) { | |
890 | printk(KERN_INFO "MD5 Hash expected but NOT found " | |
891 | "(" NIP6_FMT ", %u)->" | |
892 | "(" NIP6_FMT ", %u)\n", | |
893 | NIP6(ip6h->saddr), ntohs(th->source), | |
894 | NIP6(ip6h->daddr), ntohs(th->dest)); | |
895 | } | |
896 | return 1; | |
897 | } | |
898 | ||
899 | /* check the signature */ | |
900 | genhash = tcp_v6_do_calc_md5_hash(newhash, | |
901 | hash_expected, | |
902 | &ip6h->saddr, &ip6h->daddr, | |
903 | th, sk->sk_protocol, | |
904 | skb->len); | |
905 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { | |
906 | if (net_ratelimit()) { | |
907 | printk(KERN_INFO "MD5 Hash %s for " | |
908 | "(" NIP6_FMT ", %u)->" | |
909 | "(" NIP6_FMT ", %u)\n", | |
910 | genhash ? "failed" : "mismatch", | |
911 | NIP6(ip6h->saddr), ntohs(th->source), | |
912 | NIP6(ip6h->daddr), ntohs(th->dest)); | |
913 | } | |
914 | return 1; | |
915 | } | |
916 | return 0; | |
917 | } | |
918 | #endif | |
919 | ||
9ec75fe8 | 920 | static struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 921 | .family = AF_INET6, |
2e6599cb | 922 | .obj_size = sizeof(struct tcp6_request_sock), |
1da177e4 | 923 | .rtx_syn_ack = tcp_v6_send_synack, |
60236fdd ACM |
924 | .send_ack = tcp_v6_reqsk_send_ack, |
925 | .destructor = tcp_v6_reqsk_destructor, | |
1da177e4 LT |
926 | .send_reset = tcp_v6_send_reset |
927 | }; | |
928 | ||
cfb6eeb4 | 929 | #ifdef CONFIG_TCP_MD5SIG |
b6332e6c | 930 | static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 931 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
cfb6eeb4 | 932 | }; |
b6332e6c | 933 | #endif |
cfb6eeb4 | 934 | |
6d6ee43e ACM |
935 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
936 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
937 | .twsk_unique = tcp_twsk_unique, | |
cfb6eeb4 | 938 | .twsk_destructor= tcp_twsk_destructor, |
6d6ee43e ACM |
939 | }; |
940 | ||
8292a17a | 941 | static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) |
1da177e4 LT |
942 | { |
943 | struct ipv6_pinfo *np = inet6_sk(sk); | |
aa8223c7 | 944 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 945 | |
84fa7933 | 946 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1da177e4 | 947 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); |
663ead3b | 948 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 949 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 950 | } else { |
1ab1457c YH |
951 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, |
952 | csum_partial((char *)th, th->doff<<2, | |
1da177e4 LT |
953 | skb->csum)); |
954 | } | |
955 | } | |
956 | ||
a430a43d HX |
957 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
958 | { | |
959 | struct ipv6hdr *ipv6h; | |
960 | struct tcphdr *th; | |
961 | ||
962 | if (!pskb_may_pull(skb, sizeof(*th))) | |
963 | return -EINVAL; | |
964 | ||
0660e03f | 965 | ipv6h = ipv6_hdr(skb); |
aa8223c7 | 966 | th = tcp_hdr(skb); |
a430a43d HX |
967 | |
968 | th->check = 0; | |
969 | th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, | |
970 | IPPROTO_TCP, 0); | |
663ead3b | 971 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 972 | skb->csum_offset = offsetof(struct tcphdr, check); |
84fa7933 | 973 | skb->ip_summed = CHECKSUM_PARTIAL; |
a430a43d HX |
974 | return 0; |
975 | } | |
1da177e4 | 976 | |
cfb6eeb4 | 977 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 978 | { |
aa8223c7 | 979 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
980 | struct sk_buff *buff; |
981 | struct flowi fl; | |
cfb6eeb4 YH |
982 | int tot_len = sizeof(*th); |
983 | #ifdef CONFIG_TCP_MD5SIG | |
984 | struct tcp_md5sig_key *key; | |
985 | #endif | |
1da177e4 LT |
986 | |
987 | if (th->rst) | |
988 | return; | |
989 | ||
990 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 991 | return; |
1da177e4 | 992 | |
cfb6eeb4 YH |
993 | #ifdef CONFIG_TCP_MD5SIG |
994 | if (sk) | |
0660e03f | 995 | key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr); |
cfb6eeb4 YH |
996 | else |
997 | key = NULL; | |
998 | ||
999 | if (key) | |
1000 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
1001 | #endif | |
1002 | ||
1da177e4 LT |
1003 | /* |
1004 | * We need to grab some memory, and put together an RST, | |
1005 | * and then put it into the queue to be sent. | |
1006 | */ | |
1007 | ||
cfb6eeb4 | 1008 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 1009 | GFP_ATOMIC); |
1ab1457c YH |
1010 | if (buff == NULL) |
1011 | return; | |
1da177e4 | 1012 | |
cfb6eeb4 | 1013 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 1014 | |
cfb6eeb4 | 1015 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
1da177e4 LT |
1016 | |
1017 | /* Swap the send and the receive. */ | |
1018 | memset(t1, 0, sizeof(*t1)); | |
1019 | t1->dest = th->source; | |
1020 | t1->source = th->dest; | |
cfb6eeb4 | 1021 | t1->doff = tot_len / 4; |
1da177e4 | 1022 | t1->rst = 1; |
1ab1457c | 1023 | |
1da177e4 | 1024 | if(th->ack) { |
1ab1457c | 1025 | t1->seq = th->ack_seq; |
1da177e4 LT |
1026 | } else { |
1027 | t1->ack = 1; | |
1028 | t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin | |
1029 | + skb->len - (th->doff<<2)); | |
1030 | } | |
1031 | ||
cfb6eeb4 YH |
1032 | #ifdef CONFIG_TCP_MD5SIG |
1033 | if (key) { | |
8e5200f5 | 1034 | __be32 *opt = (__be32*)(t1 + 1); |
cfb6eeb4 YH |
1035 | opt[0] = htonl((TCPOPT_NOP << 24) | |
1036 | (TCPOPT_NOP << 16) | | |
1037 | (TCPOPT_MD5SIG << 8) | | |
1038 | TCPOLEN_MD5SIG); | |
0660e03f ACM |
1039 | tcp_v6_do_calc_md5_hash((__u8 *)&opt[1], key, |
1040 | &ipv6_hdr(skb)->daddr, | |
1041 | &ipv6_hdr(skb)->saddr, | |
1042 | t1, IPPROTO_TCP, tot_len); | |
cfb6eeb4 YH |
1043 | } |
1044 | #endif | |
1045 | ||
1da177e4 LT |
1046 | buff->csum = csum_partial((char *)t1, sizeof(*t1), 0); |
1047 | ||
1048 | memset(&fl, 0, sizeof(fl)); | |
0660e03f ACM |
1049 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
1050 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1051 | |
1052 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
1053 | sizeof(*t1), IPPROTO_TCP, | |
1054 | buff->csum); | |
1055 | ||
1056 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 1057 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
1058 | fl.fl_ip_dport = t1->dest; |
1059 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 1060 | security_skb_classify_flow(skb, &fl); |
1da177e4 LT |
1061 | |
1062 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
1063 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
1064 | ||
ecc51b6d | 1065 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
ae0f7d5f | 1066 | ip6_xmit(tcp6_socket->sk, buff, &fl, NULL, 0); |
ecc51b6d ACM |
1067 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); |
1068 | TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); | |
1da177e4 | 1069 | return; |
ecc51b6d | 1070 | } |
1da177e4 LT |
1071 | } |
1072 | ||
1073 | kfree_skb(buff); | |
1074 | } | |
1075 | ||
cfb6eeb4 YH |
1076 | static void tcp_v6_send_ack(struct tcp_timewait_sock *tw, |
1077 | struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts) | |
1da177e4 | 1078 | { |
aa8223c7 | 1079 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
1080 | struct sk_buff *buff; |
1081 | struct flowi fl; | |
1082 | int tot_len = sizeof(struct tcphdr); | |
e69a4adc | 1083 | __be32 *topt; |
cfb6eeb4 YH |
1084 | #ifdef CONFIG_TCP_MD5SIG |
1085 | struct tcp_md5sig_key *key; | |
1086 | struct tcp_md5sig_key tw_key; | |
1087 | #endif | |
1088 | ||
1089 | #ifdef CONFIG_TCP_MD5SIG | |
1090 | if (!tw && skb->sk) { | |
0660e03f | 1091 | key = tcp_v6_md5_do_lookup(skb->sk, &ipv6_hdr(skb)->daddr); |
cfb6eeb4 YH |
1092 | } else if (tw && tw->tw_md5_keylen) { |
1093 | tw_key.key = tw->tw_md5_key; | |
1094 | tw_key.keylen = tw->tw_md5_keylen; | |
1095 | key = &tw_key; | |
1096 | } else { | |
1097 | key = NULL; | |
1098 | } | |
1099 | #endif | |
1da177e4 LT |
1100 | |
1101 | if (ts) | |
4244f8a9 | 1102 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 YH |
1103 | #ifdef CONFIG_TCP_MD5SIG |
1104 | if (key) | |
1105 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
1106 | #endif | |
1da177e4 LT |
1107 | |
1108 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, | |
1109 | GFP_ATOMIC); | |
1110 | if (buff == NULL) | |
1111 | return; | |
1112 | ||
1113 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); | |
1114 | ||
1115 | t1 = (struct tcphdr *) skb_push(buff,tot_len); | |
1116 | ||
1117 | /* Swap the send and the receive. */ | |
1118 | memset(t1, 0, sizeof(*t1)); | |
1119 | t1->dest = th->source; | |
1120 | t1->source = th->dest; | |
1121 | t1->doff = tot_len/4; | |
1122 | t1->seq = htonl(seq); | |
1123 | t1->ack_seq = htonl(ack); | |
1124 | t1->ack = 1; | |
1125 | t1->window = htons(win); | |
cfb6eeb4 | 1126 | |
e69a4adc | 1127 | topt = (__be32 *)(t1 + 1); |
1ab1457c | 1128 | |
1da177e4 | 1129 | if (ts) { |
cfb6eeb4 YH |
1130 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
1131 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
1132 | *topt++ = htonl(tcp_time_stamp); | |
1133 | *topt = htonl(ts); | |
1da177e4 LT |
1134 | } |
1135 | ||
cfb6eeb4 YH |
1136 | #ifdef CONFIG_TCP_MD5SIG |
1137 | if (key) { | |
1138 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
1139 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
0660e03f ACM |
1140 | tcp_v6_do_calc_md5_hash((__u8 *)topt, key, |
1141 | &ipv6_hdr(skb)->daddr, | |
1142 | &ipv6_hdr(skb)->saddr, | |
1143 | t1, IPPROTO_TCP, tot_len); | |
cfb6eeb4 YH |
1144 | } |
1145 | #endif | |
1146 | ||
1da177e4 LT |
1147 | buff->csum = csum_partial((char *)t1, tot_len, 0); |
1148 | ||
1149 | memset(&fl, 0, sizeof(fl)); | |
0660e03f ACM |
1150 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
1151 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1152 | |
1153 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
1154 | tot_len, IPPROTO_TCP, | |
1155 | buff->csum); | |
1156 | ||
1157 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 1158 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
1159 | fl.fl_ip_dport = t1->dest; |
1160 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 1161 | security_skb_classify_flow(skb, &fl); |
1da177e4 LT |
1162 | |
1163 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
ecc51b6d | 1164 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
ae0f7d5f | 1165 | ip6_xmit(tcp6_socket->sk, buff, &fl, NULL, 0); |
ecc51b6d | 1166 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); |
1da177e4 | 1167 | return; |
ecc51b6d | 1168 | } |
1da177e4 LT |
1169 | } |
1170 | ||
1171 | kfree_skb(buff); | |
1172 | } | |
1173 | ||
1174 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1175 | { | |
8feaf0c0 | 1176 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 1177 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 1178 | |
cfb6eeb4 | 1179 | tcp_v6_send_ack(tcptw, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 ACM |
1180 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
1181 | tcptw->tw_ts_recent); | |
1da177e4 | 1182 | |
8feaf0c0 | 1183 | inet_twsk_put(tw); |
1da177e4 LT |
1184 | } |
1185 | ||
60236fdd | 1186 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req) |
1da177e4 | 1187 | { |
cfb6eeb4 | 1188 | tcp_v6_send_ack(NULL, skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent); |
1da177e4 LT |
1189 | } |
1190 | ||
1191 | ||
1192 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
1193 | { | |
60236fdd | 1194 | struct request_sock *req, **prev; |
aa8223c7 | 1195 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
1196 | struct sock *nsk; |
1197 | ||
1198 | /* Find possible connection requests. */ | |
8129765a | 1199 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
1200 | &ipv6_hdr(skb)->saddr, |
1201 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 LT |
1202 | if (req) |
1203 | return tcp_check_req(sk, skb, req, prev); | |
1204 | ||
0660e03f ACM |
1205 | nsk = __inet6_lookup_established(&tcp_hashinfo, &ipv6_hdr(skb)->saddr, |
1206 | th->source, &ipv6_hdr(skb)->daddr, | |
505cbfc5 | 1207 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 LT |
1208 | |
1209 | if (nsk) { | |
1210 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1211 | bh_lock_sock(nsk); | |
1212 | return nsk; | |
1213 | } | |
9469c7b4 | 1214 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1215 | return NULL; |
1216 | } | |
1217 | ||
1218 | #if 0 /*def CONFIG_SYN_COOKIES*/ | |
1219 | if (!th->rst && !th->syn && th->ack) | |
1220 | sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt)); | |
1221 | #endif | |
1222 | return sk; | |
1223 | } | |
1224 | ||
1da177e4 LT |
1225 | /* FIXME: this is substantially similar to the ipv4 code. |
1226 | * Can some kind of merge be done? -- erics | |
1227 | */ | |
1228 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1229 | { | |
ca304b61 | 1230 | struct inet6_request_sock *treq; |
1da177e4 LT |
1231 | struct ipv6_pinfo *np = inet6_sk(sk); |
1232 | struct tcp_options_received tmp_opt; | |
1233 | struct tcp_sock *tp = tcp_sk(sk); | |
60236fdd | 1234 | struct request_sock *req = NULL; |
1da177e4 LT |
1235 | __u32 isn = TCP_SKB_CB(skb)->when; |
1236 | ||
1237 | if (skb->protocol == htons(ETH_P_IP)) | |
1238 | return tcp_v4_conn_request(sk, skb); | |
1239 | ||
1240 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1241 | goto drop; |
1da177e4 LT |
1242 | |
1243 | /* | |
1ab1457c | 1244 | * There are no SYN attacks on IPv6, yet... |
1da177e4 | 1245 | */ |
463c84b9 | 1246 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 LT |
1247 | if (net_ratelimit()) |
1248 | printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n"); | |
1ab1457c | 1249 | goto drop; |
1da177e4 LT |
1250 | } |
1251 | ||
463c84b9 | 1252 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1253 | goto drop; |
1254 | ||
ca304b61 | 1255 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1256 | if (req == NULL) |
1257 | goto drop; | |
1258 | ||
cfb6eeb4 YH |
1259 | #ifdef CONFIG_TCP_MD5SIG |
1260 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
1261 | #endif | |
1262 | ||
1da177e4 LT |
1263 | tcp_clear_options(&tmp_opt); |
1264 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1265 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
1266 | ||
1267 | tcp_parse_options(skb, &tmp_opt, 0); | |
1268 | ||
1269 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; | |
1270 | tcp_openreq_init(req, &tmp_opt, skb); | |
1271 | ||
ca304b61 | 1272 | treq = inet6_rsk(req); |
0660e03f ACM |
1273 | ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr); |
1274 | ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr); | |
aa8223c7 | 1275 | TCP_ECN_create_request(req, tcp_hdr(skb)); |
2e6599cb | 1276 | treq->pktopts = NULL; |
1da177e4 | 1277 | if (ipv6_opt_accepted(sk, skb) || |
333fad53 YH |
1278 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
1279 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1da177e4 | 1280 | atomic_inc(&skb->users); |
2e6599cb | 1281 | treq->pktopts = skb; |
1da177e4 | 1282 | } |
2e6599cb | 1283 | treq->iif = sk->sk_bound_dev_if; |
1da177e4 LT |
1284 | |
1285 | /* So that link locals have meaning */ | |
1286 | if (!sk->sk_bound_dev_if && | |
2e6599cb | 1287 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) |
505cbfc5 | 1288 | treq->iif = inet6_iif(skb); |
1da177e4 | 1289 | |
1ab1457c | 1290 | if (isn == 0) |
a94f723d | 1291 | isn = tcp_v6_init_sequence(skb); |
1da177e4 | 1292 | |
2e6599cb | 1293 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1294 | |
4237c75c VY |
1295 | security_inet_conn_request(sk, skb, req); |
1296 | ||
1da177e4 LT |
1297 | if (tcp_v6_send_synack(sk, req, NULL)) |
1298 | goto drop; | |
1299 | ||
8129765a | 1300 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1da177e4 LT |
1301 | return 0; |
1302 | ||
1303 | drop: | |
1304 | if (req) | |
60236fdd | 1305 | reqsk_free(req); |
1da177e4 | 1306 | |
1da177e4 LT |
1307 | return 0; /* don't send reset */ |
1308 | } | |
1309 | ||
1310 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1311 | struct request_sock *req, |
1da177e4 LT |
1312 | struct dst_entry *dst) |
1313 | { | |
ca304b61 | 1314 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
1315 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1316 | struct tcp6_sock *newtcp6sk; | |
1317 | struct inet_sock *newinet; | |
1318 | struct tcp_sock *newtp; | |
1319 | struct sock *newsk; | |
1320 | struct ipv6_txoptions *opt; | |
cfb6eeb4 YH |
1321 | #ifdef CONFIG_TCP_MD5SIG |
1322 | struct tcp_md5sig_key *key; | |
1323 | #endif | |
1da177e4 LT |
1324 | |
1325 | if (skb->protocol == htons(ETH_P_IP)) { | |
1326 | /* | |
1327 | * v6 mapped | |
1328 | */ | |
1329 | ||
1330 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1331 | ||
1ab1457c | 1332 | if (newsk == NULL) |
1da177e4 LT |
1333 | return NULL; |
1334 | ||
1335 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1336 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1337 | ||
1338 | newinet = inet_sk(newsk); | |
1339 | newnp = inet6_sk(newsk); | |
1340 | newtp = tcp_sk(newsk); | |
1341 | ||
1342 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1343 | ||
1344 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
1345 | newinet->daddr); | |
1346 | ||
1347 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
1348 | newinet->saddr); | |
1349 | ||
1350 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1351 | ||
8292a17a | 1352 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1353 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1354 | #ifdef CONFIG_TCP_MD5SIG |
1355 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1356 | #endif | |
1357 | ||
1da177e4 LT |
1358 | newnp->pktoptions = NULL; |
1359 | newnp->opt = NULL; | |
505cbfc5 | 1360 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1361 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 | 1362 | |
e6848976 ACM |
1363 | /* |
1364 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1365 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1366 | * that function for the gory details. -acme | |
1da177e4 | 1367 | */ |
1da177e4 LT |
1368 | |
1369 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1370 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1371 | Sync it now. |
1372 | */ | |
d83d8461 | 1373 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1374 | |
1375 | return newsk; | |
1376 | } | |
1377 | ||
1378 | opt = np->opt; | |
1379 | ||
1380 | if (sk_acceptq_is_full(sk)) | |
1381 | goto out_overflow; | |
1382 | ||
1da177e4 LT |
1383 | if (dst == NULL) { |
1384 | struct in6_addr *final_p = NULL, final; | |
1385 | struct flowi fl; | |
1386 | ||
1387 | memset(&fl, 0, sizeof(fl)); | |
1388 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1389 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
1390 | if (opt && opt->srcrt) { |
1391 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1392 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1393 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1394 | final_p = &final; | |
1395 | } | |
2e6599cb | 1396 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1397 | fl.oif = sk->sk_bound_dev_if; |
2e6599cb | 1398 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
1da177e4 | 1399 | fl.fl_ip_sport = inet_sk(sk)->sport; |
4237c75c | 1400 | security_req_classify_flow(req, &fl); |
1da177e4 LT |
1401 | |
1402 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1403 | goto out; | |
1404 | ||
1405 | if (final_p) | |
1406 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1407 | ||
1408 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
1409 | goto out; | |
1ab1457c | 1410 | } |
1da177e4 LT |
1411 | |
1412 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1413 | if (newsk == NULL) | |
1414 | goto out; | |
1415 | ||
e6848976 ACM |
1416 | /* |
1417 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1418 | * count here, tcp_create_openreq_child now does this for us, see the | |
1419 | * comment in that function for the gory details. -acme | |
1420 | */ | |
1da177e4 | 1421 | |
59eed279 | 1422 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1423 | __ip6_dst_store(newsk, dst, NULL, NULL); |
1da177e4 LT |
1424 | |
1425 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1426 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1427 | ||
1428 | newtp = tcp_sk(newsk); | |
1429 | newinet = inet_sk(newsk); | |
1430 | newnp = inet6_sk(newsk); | |
1431 | ||
1432 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1433 | ||
2e6599cb ACM |
1434 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1435 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1436 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1437 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 | 1438 | |
1ab1457c | 1439 | /* Now IPv6 options... |
1da177e4 LT |
1440 | |
1441 | First: no IPv4 options. | |
1442 | */ | |
1443 | newinet->opt = NULL; | |
d35690be | 1444 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1445 | |
1446 | /* Clone RX bits */ | |
1447 | newnp->rxopt.all = np->rxopt.all; | |
1448 | ||
1449 | /* Clone pktoptions received with SYN */ | |
1450 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1451 | if (treq->pktopts != NULL) { |
1452 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1453 | kfree_skb(treq->pktopts); | |
1454 | treq->pktopts = NULL; | |
1da177e4 LT |
1455 | if (newnp->pktoptions) |
1456 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1457 | } | |
1458 | newnp->opt = NULL; | |
505cbfc5 | 1459 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1460 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
1461 | |
1462 | /* Clone native IPv6 options from listening socket (if any) | |
1463 | ||
1464 | Yes, keeping reference count would be much more clever, | |
1465 | but we make one more one thing there: reattach optmem | |
1466 | to newsk. | |
1467 | */ | |
1468 | if (opt) { | |
1469 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1470 | if (opt != np->opt) | |
1471 | sock_kfree_s(sk, opt, opt->tot_len); | |
1472 | } | |
1473 | ||
d83d8461 | 1474 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1475 | if (newnp->opt) |
d83d8461 ACM |
1476 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1477 | newnp->opt->opt_flen); | |
1da177e4 | 1478 | |
5d424d5a | 1479 | tcp_mtup_init(newsk); |
1da177e4 LT |
1480 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1481 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1482 | tcp_initialize_rcv_mss(newsk); | |
1483 | ||
1484 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
1485 | ||
cfb6eeb4 YH |
1486 | #ifdef CONFIG_TCP_MD5SIG |
1487 | /* Copy over the MD5 key from the original socket */ | |
1488 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1489 | /* We're using one, so create a matching key | |
1490 | * on the newsk structure. If we fail to get | |
1491 | * memory, then we end up not copying the key | |
1492 | * across. Shucks. | |
1493 | */ | |
af879cc7 ACM |
1494 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1495 | if (newkey != NULL) | |
cfb6eeb4 YH |
1496 | tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr, |
1497 | newkey, key->keylen); | |
cfb6eeb4 YH |
1498 | } |
1499 | #endif | |
1500 | ||
90b19d31 | 1501 | __inet6_hash(&tcp_hashinfo, newsk); |
2d8c4ce5 | 1502 | inet_inherit_port(&tcp_hashinfo, sk, newsk); |
1da177e4 LT |
1503 | |
1504 | return newsk; | |
1505 | ||
1506 | out_overflow: | |
1507 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
1508 | out: | |
1509 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
1510 | if (opt && opt != np->opt) | |
1511 | sock_kfree_s(sk, opt, opt->tot_len); | |
1512 | dst_release(dst); | |
1513 | return NULL; | |
1514 | } | |
1515 | ||
b51655b9 | 1516 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1517 | { |
84fa7933 | 1518 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
aa8223c7 | 1519 | if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1520 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1521 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1522 | return 0; |
fb286bb2 | 1523 | } |
1da177e4 | 1524 | } |
fb286bb2 | 1525 | |
aa8223c7 | 1526 | skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len, |
0660e03f ACM |
1527 | &ipv6_hdr(skb)->saddr, |
1528 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1529 | |
1da177e4 | 1530 | if (skb->len <= 76) { |
fb286bb2 | 1531 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1532 | } |
1533 | return 0; | |
1534 | } | |
1535 | ||
1536 | /* The socket must have it's spinlock held when we get | |
1537 | * here. | |
1538 | * | |
1539 | * We have a potential double-lock case here, so even when | |
1540 | * doing backlog processing we use the BH locking scheme. | |
1541 | * This is because we cannot sleep with the original spinlock | |
1542 | * held. | |
1543 | */ | |
1544 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1545 | { | |
1546 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1547 | struct tcp_sock *tp; | |
1548 | struct sk_buff *opt_skb = NULL; | |
1549 | ||
1550 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1551 | goes to IPv4 receive handler and backlogged. | |
1552 | From backlog it always goes here. Kerboom... | |
1553 | Fortunately, tcp_rcv_established and rcv_established | |
1554 | handle them correctly, but it is not case with | |
1555 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1556 | */ | |
1557 | ||
1558 | if (skb->protocol == htons(ETH_P_IP)) | |
1559 | return tcp_v4_do_rcv(sk, skb); | |
1560 | ||
cfb6eeb4 YH |
1561 | #ifdef CONFIG_TCP_MD5SIG |
1562 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1563 | goto discard; | |
1564 | #endif | |
1565 | ||
fda9ef5d | 1566 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1567 | goto discard; |
1568 | ||
1569 | /* | |
1570 | * socket locking is here for SMP purposes as backlog rcv | |
1571 | * is currently called with bh processing disabled. | |
1572 | */ | |
1573 | ||
1574 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1575 | ||
1576 | Yes, guys, it is the only place in our code, where we | |
1577 | may make it not affecting IPv4. | |
1578 | The rest of code is protocol independent, | |
1579 | and I do not like idea to uglify IPv4. | |
1580 | ||
1581 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1582 | looks not very well thought. For now we latch | |
1583 | options, received in the last packet, enqueued | |
1584 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1585 | --ANK (980728) |
1da177e4 LT |
1586 | */ |
1587 | if (np->rxopt.all) | |
1588 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1589 | ||
1590 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1591 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1592 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1593 | goto reset; |
1594 | TCP_CHECK_TIMER(sk); | |
1595 | if (opt_skb) | |
1596 | goto ipv6_pktoptions; | |
1597 | return 0; | |
1598 | } | |
1599 | ||
ab6a5bb6 | 1600 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1601 | goto csum_err; |
1602 | ||
1ab1457c | 1603 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1604 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1605 | if (!nsk) | |
1606 | goto discard; | |
1607 | ||
1608 | /* | |
1609 | * Queue it on the new socket if the new socket is active, | |
1610 | * otherwise we just shortcircuit this and continue with | |
1611 | * the new socket.. | |
1612 | */ | |
1ab1457c | 1613 | if(nsk != sk) { |
1da177e4 LT |
1614 | if (tcp_child_process(sk, nsk, skb)) |
1615 | goto reset; | |
1616 | if (opt_skb) | |
1617 | __kfree_skb(opt_skb); | |
1618 | return 0; | |
1619 | } | |
1620 | } | |
1621 | ||
1622 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1623 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1624 | goto reset; |
1625 | TCP_CHECK_TIMER(sk); | |
1626 | if (opt_skb) | |
1627 | goto ipv6_pktoptions; | |
1628 | return 0; | |
1629 | ||
1630 | reset: | |
cfb6eeb4 | 1631 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1632 | discard: |
1633 | if (opt_skb) | |
1634 | __kfree_skb(opt_skb); | |
1635 | kfree_skb(skb); | |
1636 | return 0; | |
1637 | csum_err: | |
1638 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1639 | goto discard; | |
1640 | ||
1641 | ||
1642 | ipv6_pktoptions: | |
1643 | /* Do you ask, what is it? | |
1644 | ||
1645 | 1. skb was enqueued by tcp. | |
1646 | 2. skb is added to tail of read queue, rather than out of order. | |
1647 | 3. socket is not in passive state. | |
1648 | 4. Finally, it really contains options, which user wants to receive. | |
1649 | */ | |
1650 | tp = tcp_sk(sk); | |
1651 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1652 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1653 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1654 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1655 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1656 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
1da177e4 LT |
1657 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1658 | skb_set_owner_r(opt_skb, sk); | |
1659 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1660 | } else { | |
1661 | __kfree_skb(opt_skb); | |
1662 | opt_skb = xchg(&np->pktoptions, NULL); | |
1663 | } | |
1664 | } | |
1665 | ||
1666 | if (opt_skb) | |
1667 | kfree_skb(opt_skb); | |
1668 | return 0; | |
1669 | } | |
1670 | ||
951dbc8a | 1671 | static int tcp_v6_rcv(struct sk_buff **pskb) |
1da177e4 LT |
1672 | { |
1673 | struct sk_buff *skb = *pskb; | |
1ab1457c | 1674 | struct tcphdr *th; |
1da177e4 LT |
1675 | struct sock *sk; |
1676 | int ret; | |
1677 | ||
1678 | if (skb->pkt_type != PACKET_HOST) | |
1679 | goto discard_it; | |
1680 | ||
1681 | /* | |
1682 | * Count it even if it's bad. | |
1683 | */ | |
1684 | TCP_INC_STATS_BH(TCP_MIB_INSEGS); | |
1685 | ||
1686 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1687 | goto discard_it; | |
1688 | ||
aa8223c7 | 1689 | th = tcp_hdr(skb); |
1da177e4 LT |
1690 | |
1691 | if (th->doff < sizeof(struct tcphdr)/4) | |
1692 | goto bad_packet; | |
1693 | if (!pskb_may_pull(skb, th->doff*4)) | |
1694 | goto discard_it; | |
1695 | ||
60476372 | 1696 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1da177e4 LT |
1697 | goto bad_packet; |
1698 | ||
aa8223c7 | 1699 | th = tcp_hdr(skb); |
1da177e4 LT |
1700 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1701 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1702 | skb->len - th->doff*4); | |
1703 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1704 | TCP_SKB_CB(skb)->when = 0; | |
0660e03f | 1705 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 LT |
1706 | TCP_SKB_CB(skb)->sacked = 0; |
1707 | ||
0660e03f ACM |
1708 | sk = __inet6_lookup(&tcp_hashinfo, &ipv6_hdr(skb)->saddr, th->source, |
1709 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), | |
505cbfc5 | 1710 | inet6_iif(skb)); |
1da177e4 LT |
1711 | |
1712 | if (!sk) | |
1713 | goto no_tcp_socket; | |
1714 | ||
1715 | process: | |
1716 | if (sk->sk_state == TCP_TIME_WAIT) | |
1717 | goto do_time_wait; | |
1718 | ||
1719 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1720 | goto discard_and_relse; | |
1721 | ||
fda9ef5d | 1722 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1723 | goto discard_and_relse; |
1724 | ||
1725 | skb->dev = NULL; | |
1726 | ||
293b9c42 | 1727 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1728 | ret = 0; |
1729 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1730 | #ifdef CONFIG_NET_DMA |
1ab1457c YH |
1731 | struct tcp_sock *tp = tcp_sk(sk); |
1732 | if (tp->ucopy.dma_chan) | |
1733 | ret = tcp_v6_do_rcv(sk, skb); | |
1734 | else | |
1a2449a8 CL |
1735 | #endif |
1736 | { | |
1737 | if (!tcp_prequeue(sk, skb)) | |
1738 | ret = tcp_v6_do_rcv(sk, skb); | |
1739 | } | |
1da177e4 LT |
1740 | } else |
1741 | sk_add_backlog(sk, skb); | |
1742 | bh_unlock_sock(sk); | |
1743 | ||
1744 | sock_put(sk); | |
1745 | return ret ? -1 : 0; | |
1746 | ||
1747 | no_tcp_socket: | |
1748 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1749 | goto discard_it; | |
1750 | ||
1751 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1752 | bad_packet: | |
1753 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1754 | } else { | |
cfb6eeb4 | 1755 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1756 | } |
1757 | ||
1758 | discard_it: | |
1759 | ||
1760 | /* | |
1761 | * Discard frame | |
1762 | */ | |
1763 | ||
1764 | kfree_skb(skb); | |
1765 | return 0; | |
1766 | ||
1767 | discard_and_relse: | |
1768 | sock_put(sk); | |
1769 | goto discard_it; | |
1770 | ||
1771 | do_time_wait: | |
1772 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1773 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1774 | goto discard_it; |
1775 | } | |
1776 | ||
1777 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1778 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
9469c7b4 | 1779 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1780 | goto discard_it; |
1781 | } | |
1782 | ||
9469c7b4 | 1783 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1784 | case TCP_TW_SYN: |
1785 | { | |
1786 | struct sock *sk2; | |
1787 | ||
505cbfc5 | 1788 | sk2 = inet6_lookup_listener(&tcp_hashinfo, |
0660e03f | 1789 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1790 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1791 | if (sk2 != NULL) { |
295ff7ed ACM |
1792 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1793 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1794 | inet_twsk_put(tw); | |
1da177e4 LT |
1795 | sk = sk2; |
1796 | goto process; | |
1797 | } | |
1798 | /* Fall through to ACK */ | |
1799 | } | |
1800 | case TCP_TW_ACK: | |
1801 | tcp_v6_timewait_ack(sk, skb); | |
1802 | break; | |
1803 | case TCP_TW_RST: | |
1804 | goto no_tcp_socket; | |
1805 | case TCP_TW_SUCCESS:; | |
1806 | } | |
1807 | goto discard_it; | |
1808 | } | |
1809 | ||
1da177e4 LT |
1810 | static int tcp_v6_remember_stamp(struct sock *sk) |
1811 | { | |
1812 | /* Alas, not yet... */ | |
1813 | return 0; | |
1814 | } | |
1815 | ||
8292a17a | 1816 | static struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1817 | .queue_xmit = inet6_csk_xmit, |
1818 | .send_check = tcp_v6_send_check, | |
1819 | .rebuild_header = inet6_sk_rebuild_header, | |
1820 | .conn_request = tcp_v6_conn_request, | |
1821 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1822 | .remember_stamp = tcp_v6_remember_stamp, | |
1823 | .net_header_len = sizeof(struct ipv6hdr), | |
1824 | .setsockopt = ipv6_setsockopt, | |
1825 | .getsockopt = ipv6_getsockopt, | |
1826 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1827 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1828 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1829 | .compat_setsockopt = compat_ipv6_setsockopt, |
1830 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1831 | #endif |
1da177e4 LT |
1832 | }; |
1833 | ||
cfb6eeb4 | 1834 | #ifdef CONFIG_TCP_MD5SIG |
a928630a | 1835 | static struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 YH |
1836 | .md5_lookup = tcp_v6_md5_lookup, |
1837 | .calc_md5_hash = tcp_v6_calc_md5_hash, | |
1838 | .md5_add = tcp_v6_md5_add_func, | |
1839 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1840 | }; |
a928630a | 1841 | #endif |
cfb6eeb4 | 1842 | |
1da177e4 LT |
1843 | /* |
1844 | * TCP over IPv4 via INET6 API | |
1845 | */ | |
1846 | ||
8292a17a | 1847 | static struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1848 | .queue_xmit = ip_queue_xmit, |
1849 | .send_check = tcp_v4_send_check, | |
1850 | .rebuild_header = inet_sk_rebuild_header, | |
1851 | .conn_request = tcp_v6_conn_request, | |
1852 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1853 | .remember_stamp = tcp_v4_remember_stamp, | |
1854 | .net_header_len = sizeof(struct iphdr), | |
1855 | .setsockopt = ipv6_setsockopt, | |
1856 | .getsockopt = ipv6_getsockopt, | |
1857 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1858 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1859 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1860 | .compat_setsockopt = compat_ipv6_setsockopt, |
1861 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1862 | #endif |
1da177e4 LT |
1863 | }; |
1864 | ||
cfb6eeb4 | 1865 | #ifdef CONFIG_TCP_MD5SIG |
a928630a | 1866 | static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 YH |
1867 | .md5_lookup = tcp_v4_md5_lookup, |
1868 | .calc_md5_hash = tcp_v4_calc_md5_hash, | |
1869 | .md5_add = tcp_v6_md5_add_func, | |
1870 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1871 | }; |
a928630a | 1872 | #endif |
cfb6eeb4 | 1873 | |
1da177e4 LT |
1874 | /* NOTE: A lot of things set to zero explicitly by call to |
1875 | * sk_alloc() so need not be done here. | |
1876 | */ | |
1877 | static int tcp_v6_init_sock(struct sock *sk) | |
1878 | { | |
6687e988 | 1879 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1880 | struct tcp_sock *tp = tcp_sk(sk); |
1881 | ||
1882 | skb_queue_head_init(&tp->out_of_order_queue); | |
1883 | tcp_init_xmit_timers(sk); | |
1884 | tcp_prequeue_init(tp); | |
1885 | ||
6687e988 | 1886 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1887 | tp->mdev = TCP_TIMEOUT_INIT; |
1888 | ||
1889 | /* So many TCP implementations out there (incorrectly) count the | |
1890 | * initial SYN frame in their delayed-ACK and congestion control | |
1891 | * algorithms that we must have the following bandaid to talk | |
1892 | * efficiently to them. -DaveM | |
1893 | */ | |
1894 | tp->snd_cwnd = 2; | |
1895 | ||
1896 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1897 | * initialization of these values. | |
1898 | */ | |
1899 | tp->snd_ssthresh = 0x7fffffff; | |
1900 | tp->snd_cwnd_clamp = ~0; | |
c1b4a7e6 | 1901 | tp->mss_cache = 536; |
1da177e4 LT |
1902 | |
1903 | tp->reordering = sysctl_tcp_reordering; | |
1904 | ||
1905 | sk->sk_state = TCP_CLOSE; | |
1906 | ||
8292a17a | 1907 | icsk->icsk_af_ops = &ipv6_specific; |
6687e988 | 1908 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
d83d8461 | 1909 | icsk->icsk_sync_mss = tcp_sync_mss; |
1da177e4 LT |
1910 | sk->sk_write_space = sk_stream_write_space; |
1911 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1912 | ||
cfb6eeb4 YH |
1913 | #ifdef CONFIG_TCP_MD5SIG |
1914 | tp->af_specific = &tcp_sock_ipv6_specific; | |
1915 | #endif | |
1916 | ||
1da177e4 LT |
1917 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
1918 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1919 | ||
1920 | atomic_inc(&tcp_sockets_allocated); | |
1921 | ||
1922 | return 0; | |
1923 | } | |
1924 | ||
1925 | static int tcp_v6_destroy_sock(struct sock *sk) | |
1926 | { | |
cfb6eeb4 YH |
1927 | #ifdef CONFIG_TCP_MD5SIG |
1928 | /* Clean up the MD5 key list */ | |
1929 | if (tcp_sk(sk)->md5sig_info) | |
1930 | tcp_v6_clear_md5_list(sk); | |
1931 | #endif | |
1da177e4 LT |
1932 | tcp_v4_destroy_sock(sk); |
1933 | return inet6_destroy_sock(sk); | |
1934 | } | |
1935 | ||
952a10be | 1936 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1937 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1938 | static void get_openreq6(struct seq_file *seq, |
60236fdd | 1939 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 1940 | { |
1da177e4 | 1941 | int ttd = req->expires - jiffies; |
ca304b61 ACM |
1942 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1943 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1944 | |
1945 | if (ttd < 0) | |
1946 | ttd = 0; | |
1947 | ||
1da177e4 LT |
1948 | seq_printf(seq, |
1949 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1950 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1951 | i, | |
1952 | src->s6_addr32[0], src->s6_addr32[1], | |
1953 | src->s6_addr32[2], src->s6_addr32[3], | |
1954 | ntohs(inet_sk(sk)->sport), | |
1955 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1956 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1957 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1958 | TCP_SYN_RECV, |
1959 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
1960 | 1, /* timers active (only the expire timer) */ |
1961 | jiffies_to_clock_t(ttd), | |
1da177e4 LT |
1962 | req->retrans, |
1963 | uid, | |
1ab1457c | 1964 | 0, /* non standard timer */ |
1da177e4 LT |
1965 | 0, /* open_requests have no inode */ |
1966 | 0, req); | |
1967 | } | |
1968 | ||
1969 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1970 | { | |
1971 | struct in6_addr *dest, *src; | |
1972 | __u16 destp, srcp; | |
1973 | int timer_active; | |
1974 | unsigned long timer_expires; | |
1975 | struct inet_sock *inet = inet_sk(sp); | |
1976 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1977 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
1978 | struct ipv6_pinfo *np = inet6_sk(sp); |
1979 | ||
1980 | dest = &np->daddr; | |
1981 | src = &np->rcv_saddr; | |
1982 | destp = ntohs(inet->dport); | |
1983 | srcp = ntohs(inet->sport); | |
463c84b9 ACM |
1984 | |
1985 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1986 | timer_active = 1; |
463c84b9 ACM |
1987 | timer_expires = icsk->icsk_timeout; |
1988 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1989 | timer_active = 4; |
463c84b9 | 1990 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1991 | } else if (timer_pending(&sp->sk_timer)) { |
1992 | timer_active = 2; | |
1993 | timer_expires = sp->sk_timer.expires; | |
1994 | } else { | |
1995 | timer_active = 0; | |
1996 | timer_expires = jiffies; | |
1997 | } | |
1998 | ||
1999 | seq_printf(seq, | |
2000 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2001 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n", | |
2002 | i, | |
2003 | src->s6_addr32[0], src->s6_addr32[1], | |
2004 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2005 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2006 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 2007 | sp->sk_state, |
47da8ee6 SS |
2008 | tp->write_seq-tp->snd_una, |
2009 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 LT |
2010 | timer_active, |
2011 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 2012 | icsk->icsk_retransmits, |
1da177e4 | 2013 | sock_i_uid(sp), |
6687e988 | 2014 | icsk->icsk_probes_out, |
1da177e4 LT |
2015 | sock_i_ino(sp), |
2016 | atomic_read(&sp->sk_refcnt), sp, | |
463c84b9 ACM |
2017 | icsk->icsk_rto, |
2018 | icsk->icsk_ack.ato, | |
2019 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, | |
1da177e4 LT |
2020 | tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh |
2021 | ); | |
2022 | } | |
2023 | ||
1ab1457c | 2024 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 2025 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
2026 | { |
2027 | struct in6_addr *dest, *src; | |
2028 | __u16 destp, srcp; | |
0fa1a53e | 2029 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
2030 | int ttd = tw->tw_ttd - jiffies; |
2031 | ||
2032 | if (ttd < 0) | |
2033 | ttd = 0; | |
2034 | ||
0fa1a53e ACM |
2035 | dest = &tw6->tw_v6_daddr; |
2036 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
2037 | destp = ntohs(tw->tw_dport); |
2038 | srcp = ntohs(tw->tw_sport); | |
2039 | ||
2040 | seq_printf(seq, | |
2041 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2042 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
2043 | i, | |
2044 | src->s6_addr32[0], src->s6_addr32[1], | |
2045 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2046 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2047 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2048 | tw->tw_substate, 0, 0, | |
2049 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2050 | atomic_read(&tw->tw_refcnt), tw); | |
2051 | } | |
2052 | ||
1da177e4 LT |
2053 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
2054 | { | |
2055 | struct tcp_iter_state *st; | |
2056 | ||
2057 | if (v == SEQ_START_TOKEN) { | |
2058 | seq_puts(seq, | |
2059 | " sl " | |
2060 | "local_address " | |
2061 | "remote_address " | |
2062 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2063 | " uid timeout inode\n"); | |
2064 | goto out; | |
2065 | } | |
2066 | st = seq->private; | |
2067 | ||
2068 | switch (st->state) { | |
2069 | case TCP_SEQ_STATE_LISTENING: | |
2070 | case TCP_SEQ_STATE_ESTABLISHED: | |
2071 | get_tcp6_sock(seq, v, st->num); | |
2072 | break; | |
2073 | case TCP_SEQ_STATE_OPENREQ: | |
2074 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
2075 | break; | |
2076 | case TCP_SEQ_STATE_TIME_WAIT: | |
2077 | get_timewait6_sock(seq, v, st->num); | |
2078 | break; | |
2079 | } | |
2080 | out: | |
2081 | return 0; | |
2082 | } | |
2083 | ||
2084 | static struct file_operations tcp6_seq_fops; | |
2085 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { | |
2086 | .owner = THIS_MODULE, | |
2087 | .name = "tcp6", | |
2088 | .family = AF_INET6, | |
2089 | .seq_show = tcp6_seq_show, | |
2090 | .seq_fops = &tcp6_seq_fops, | |
2091 | }; | |
2092 | ||
2093 | int __init tcp6_proc_init(void) | |
2094 | { | |
2095 | return tcp_proc_register(&tcp6_seq_afinfo); | |
2096 | } | |
2097 | ||
2098 | void tcp6_proc_exit(void) | |
2099 | { | |
2100 | tcp_proc_unregister(&tcp6_seq_afinfo); | |
2101 | } | |
2102 | #endif | |
2103 | ||
2104 | struct proto tcpv6_prot = { | |
2105 | .name = "TCPv6", | |
2106 | .owner = THIS_MODULE, | |
2107 | .close = tcp_close, | |
2108 | .connect = tcp_v6_connect, | |
2109 | .disconnect = tcp_disconnect, | |
463c84b9 | 2110 | .accept = inet_csk_accept, |
1da177e4 LT |
2111 | .ioctl = tcp_ioctl, |
2112 | .init = tcp_v6_init_sock, | |
2113 | .destroy = tcp_v6_destroy_sock, | |
2114 | .shutdown = tcp_shutdown, | |
2115 | .setsockopt = tcp_setsockopt, | |
2116 | .getsockopt = tcp_getsockopt, | |
1da177e4 LT |
2117 | .recvmsg = tcp_recvmsg, |
2118 | .backlog_rcv = tcp_v6_do_rcv, | |
2119 | .hash = tcp_v6_hash, | |
2120 | .unhash = tcp_unhash, | |
2121 | .get_port = tcp_v6_get_port, | |
2122 | .enter_memory_pressure = tcp_enter_memory_pressure, | |
2123 | .sockets_allocated = &tcp_sockets_allocated, | |
2124 | .memory_allocated = &tcp_memory_allocated, | |
2125 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2126 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2127 | .sysctl_mem = sysctl_tcp_mem, |
2128 | .sysctl_wmem = sysctl_tcp_wmem, | |
2129 | .sysctl_rmem = sysctl_tcp_rmem, | |
2130 | .max_header = MAX_TCP_HEADER, | |
2131 | .obj_size = sizeof(struct tcp6_sock), | |
6d6ee43e | 2132 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2133 | .rsk_prot = &tcp6_request_sock_ops, |
543d9cfe ACM |
2134 | #ifdef CONFIG_COMPAT |
2135 | .compat_setsockopt = compat_tcp_setsockopt, | |
2136 | .compat_getsockopt = compat_tcp_getsockopt, | |
2137 | #endif | |
1da177e4 LT |
2138 | }; |
2139 | ||
2140 | static struct inet6_protocol tcpv6_protocol = { | |
2141 | .handler = tcp_v6_rcv, | |
2142 | .err_handler = tcp_v6_err, | |
a430a43d | 2143 | .gso_send_check = tcp_v6_gso_send_check, |
adcfc7d0 | 2144 | .gso_segment = tcp_tso_segment, |
1da177e4 LT |
2145 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
2146 | }; | |
2147 | ||
1da177e4 LT |
2148 | static struct inet_protosw tcpv6_protosw = { |
2149 | .type = SOCK_STREAM, | |
2150 | .protocol = IPPROTO_TCP, | |
2151 | .prot = &tcpv6_prot, | |
2152 | .ops = &inet6_stream_ops, | |
2153 | .capability = -1, | |
2154 | .no_check = 0, | |
d83d8461 ACM |
2155 | .flags = INET_PROTOSW_PERMANENT | |
2156 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2157 | }; |
2158 | ||
2159 | void __init tcpv6_init(void) | |
2160 | { | |
2161 | /* register inet6 protocol */ | |
2162 | if (inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP) < 0) | |
2163 | printk(KERN_ERR "tcpv6_init: Could not register protocol\n"); | |
2164 | inet6_register_protosw(&tcpv6_protosw); | |
ae0f7d5f | 2165 | |
c4d93909 ACM |
2166 | if (inet_csk_ctl_sock_create(&tcp6_socket, PF_INET6, SOCK_RAW, |
2167 | IPPROTO_TCP) < 0) | |
ae0f7d5f | 2168 | panic("Failed to create the TCPv6 control socket.\n"); |
1da177e4 | 2169 | } |