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 | 7 | * |
1ab1457c | 8 | * Based on: |
1da177e4 LT |
9 | * linux/net/ipv4/tcp.c |
10 | * linux/net/ipv4/tcp_input.c | |
11 | * linux/net/ipv4/tcp_output.c | |
12 | * | |
13 | * Fixes: | |
14 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
15 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
16 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
17 | * a single port at the same time. | |
18 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file. | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or | |
21 | * modify it under the terms of the GNU General Public License | |
22 | * as published by the Free Software Foundation; either version | |
23 | * 2 of the License, or (at your option) any later version. | |
24 | */ | |
25 | ||
26 | #include <linux/module.h> | |
1da177e4 LT |
27 | #include <linux/errno.h> |
28 | #include <linux/types.h> | |
29 | #include <linux/socket.h> | |
30 | #include <linux/sockios.h> | |
31 | #include <linux/net.h> | |
32 | #include <linux/jiffies.h> | |
33 | #include <linux/in.h> | |
34 | #include <linux/in6.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/jhash.h> | |
38 | #include <linux/ipsec.h> | |
39 | #include <linux/times.h> | |
40 | ||
41 | #include <linux/ipv6.h> | |
42 | #include <linux/icmpv6.h> | |
43 | #include <linux/random.h> | |
44 | ||
45 | #include <net/tcp.h> | |
46 | #include <net/ndisc.h> | |
5324a040 | 47 | #include <net/inet6_hashtables.h> |
8129765a | 48 | #include <net/inet6_connection_sock.h> |
1da177e4 LT |
49 | #include <net/ipv6.h> |
50 | #include <net/transp_v6.h> | |
51 | #include <net/addrconf.h> | |
52 | #include <net/ip6_route.h> | |
53 | #include <net/ip6_checksum.h> | |
54 | #include <net/inet_ecn.h> | |
55 | #include <net/protocol.h> | |
56 | #include <net/xfrm.h> | |
1da177e4 LT |
57 | #include <net/snmp.h> |
58 | #include <net/dsfield.h> | |
6d6ee43e | 59 | #include <net/timewait_sock.h> |
18134bed | 60 | #include <net/netdma.h> |
3d58b5fa | 61 | #include <net/inet_common.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 | ||
cfb6eeb4 | 71 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
6edafaaf GJ |
72 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
73 | struct request_sock *req); | |
1da177e4 LT |
74 | |
75 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 76 | |
8292a17a ACM |
77 | static struct inet_connection_sock_af_ops ipv6_mapped; |
78 | static struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 79 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
80 | static struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
81 | static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
82 | #else |
83 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
84 | struct in6_addr *addr) | |
85 | { | |
86 | return NULL; | |
87 | } | |
a928630a | 88 | #endif |
1da177e4 | 89 | |
1da177e4 LT |
90 | static void tcp_v6_hash(struct sock *sk) |
91 | { | |
92 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 93 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
94 | tcp_prot.hash(sk); |
95 | return; | |
96 | } | |
97 | local_bh_disable(); | |
ab1e0a13 | 98 | __inet6_hash(sk); |
1da177e4 LT |
99 | local_bh_enable(); |
100 | } | |
101 | } | |
102 | ||
868c86bc | 103 | static __inline__ __sum16 tcp_v6_check(struct tcphdr *th, int len, |
1ab1457c YH |
104 | struct in6_addr *saddr, |
105 | struct in6_addr *daddr, | |
868c86bc | 106 | __wsum base) |
1da177e4 LT |
107 | { |
108 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
109 | } | |
110 | ||
a94f723d | 111 | static __u32 tcp_v6_init_sequence(struct sk_buff *skb) |
1da177e4 | 112 | { |
0660e03f ACM |
113 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
114 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
115 | tcp_hdr(skb)->dest, |
116 | tcp_hdr(skb)->source); | |
1da177e4 LT |
117 | } |
118 | ||
1ab1457c | 119 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
120 | int addr_len) |
121 | { | |
122 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 123 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 124 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
125 | struct ipv6_pinfo *np = inet6_sk(sk); |
126 | struct tcp_sock *tp = tcp_sk(sk); | |
127 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
128 | struct flowi fl; | |
129 | struct dst_entry *dst; | |
130 | int addr_type; | |
131 | int err; | |
132 | ||
1ab1457c | 133 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
134 | return -EINVAL; |
135 | ||
1ab1457c | 136 | if (usin->sin6_family != AF_INET6) |
1da177e4 LT |
137 | return(-EAFNOSUPPORT); |
138 | ||
139 | memset(&fl, 0, sizeof(fl)); | |
140 | ||
141 | if (np->sndflow) { | |
142 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
143 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
144 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
145 | struct ip6_flowlabel *flowlabel; | |
146 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
147 | if (flowlabel == NULL) | |
148 | return -EINVAL; | |
149 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
150 | fl6_sock_release(flowlabel); | |
151 | } | |
152 | } | |
153 | ||
154 | /* | |
1ab1457c YH |
155 | * connect() to INADDR_ANY means loopback (BSD'ism). |
156 | */ | |
157 | ||
158 | if(ipv6_addr_any(&usin->sin6_addr)) | |
159 | usin->sin6_addr.s6_addr[15] = 0x1; | |
1da177e4 LT |
160 | |
161 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
162 | ||
163 | if(addr_type & IPV6_ADDR_MULTICAST) | |
164 | return -ENETUNREACH; | |
165 | ||
166 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
167 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
168 | usin->sin6_scope_id) { | |
169 | /* If interface is set while binding, indices | |
170 | * must coincide. | |
171 | */ | |
172 | if (sk->sk_bound_dev_if && | |
173 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
174 | return -EINVAL; | |
175 | ||
176 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
177 | } | |
178 | ||
179 | /* Connect to link-local address requires an interface */ | |
180 | if (!sk->sk_bound_dev_if) | |
181 | return -EINVAL; | |
182 | } | |
183 | ||
184 | if (tp->rx_opt.ts_recent_stamp && | |
185 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
186 | tp->rx_opt.ts_recent = 0; | |
187 | tp->rx_opt.ts_recent_stamp = 0; | |
188 | tp->write_seq = 0; | |
189 | } | |
190 | ||
191 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
192 | np->flow_label = fl.fl6_flowlabel; | |
193 | ||
194 | /* | |
195 | * TCP over IPv4 | |
196 | */ | |
197 | ||
198 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 199 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
200 | struct sockaddr_in sin; |
201 | ||
202 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
203 | ||
204 | if (__ipv6_only_sock(sk)) | |
205 | return -ENETUNREACH; | |
206 | ||
207 | sin.sin_family = AF_INET; | |
208 | sin.sin_port = usin->sin6_port; | |
209 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
210 | ||
d83d8461 | 211 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 212 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
213 | #ifdef CONFIG_TCP_MD5SIG |
214 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
215 | #endif | |
1da177e4 LT |
216 | |
217 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
218 | ||
219 | if (err) { | |
d83d8461 ACM |
220 | icsk->icsk_ext_hdr_len = exthdrlen; |
221 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 222 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
223 | #ifdef CONFIG_TCP_MD5SIG |
224 | tp->af_specific = &tcp_sock_ipv6_specific; | |
225 | #endif | |
1da177e4 LT |
226 | goto failure; |
227 | } else { | |
228 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
229 | inet->saddr); | |
230 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
231 | inet->rcv_saddr); | |
232 | } | |
233 | ||
234 | return err; | |
235 | } | |
236 | ||
237 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
238 | saddr = &np->rcv_saddr; | |
239 | ||
240 | fl.proto = IPPROTO_TCP; | |
241 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
242 | ipv6_addr_copy(&fl.fl6_src, | |
243 | (saddr ? saddr : &np->saddr)); | |
244 | fl.oif = sk->sk_bound_dev_if; | |
245 | fl.fl_ip_dport = usin->sin6_port; | |
246 | fl.fl_ip_sport = inet->sport; | |
247 | ||
248 | if (np->opt && np->opt->srcrt) { | |
249 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
250 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
251 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
252 | final_p = &final; | |
253 | } | |
254 | ||
beb8d13b VY |
255 | security_sk_classify_flow(sk, &fl); |
256 | ||
1da177e4 LT |
257 | err = ip6_dst_lookup(sk, &dst, &fl); |
258 | if (err) | |
259 | goto failure; | |
260 | if (final_p) | |
261 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
262 | ||
bb72845e | 263 | if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) { |
14e50e57 DM |
264 | if (err == -EREMOTE) |
265 | err = ip6_dst_blackhole(sk, &dst, &fl); | |
266 | if (err < 0) | |
267 | goto failure; | |
268 | } | |
1da177e4 LT |
269 | |
270 | if (saddr == NULL) { | |
271 | saddr = &fl.fl6_src; | |
272 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
273 | } | |
274 | ||
275 | /* set the source address */ | |
276 | ipv6_addr_copy(&np->saddr, saddr); | |
277 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
278 | ||
f83ef8c0 | 279 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 280 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 281 | |
d83d8461 | 282 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 283 | if (np->opt) |
d83d8461 ACM |
284 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
285 | np->opt->opt_nflen); | |
1da177e4 LT |
286 | |
287 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
288 | ||
289 | inet->dport = usin->sin6_port; | |
290 | ||
291 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 292 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
293 | if (err) |
294 | goto late_failure; | |
295 | ||
296 | if (!tp->write_seq) | |
297 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
298 | np->daddr.s6_addr32, | |
299 | inet->sport, | |
300 | inet->dport); | |
301 | ||
302 | err = tcp_connect(sk); | |
303 | if (err) | |
304 | goto late_failure; | |
305 | ||
306 | return 0; | |
307 | ||
308 | late_failure: | |
309 | tcp_set_state(sk, TCP_CLOSE); | |
310 | __sk_dst_reset(sk); | |
311 | failure: | |
312 | inet->dport = 0; | |
313 | sk->sk_route_caps = 0; | |
314 | return err; | |
315 | } | |
316 | ||
317 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
04ce6909 | 318 | int type, int code, int offset, __be32 info) |
1da177e4 LT |
319 | { |
320 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
505cbfc5 | 321 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
322 | struct ipv6_pinfo *np; |
323 | struct sock *sk; | |
324 | int err; | |
1ab1457c | 325 | struct tcp_sock *tp; |
1da177e4 | 326 | __u32 seq; |
ca12a1a4 | 327 | struct net *net = dev_net(skb->dev); |
1da177e4 | 328 | |
ca12a1a4 | 329 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 330 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
331 | |
332 | if (sk == NULL) { | |
333 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
334 | return; | |
335 | } | |
336 | ||
337 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 338 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
339 | return; |
340 | } | |
341 | ||
342 | bh_lock_sock(sk); | |
343 | if (sock_owned_by_user(sk)) | |
de0744af | 344 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
345 | |
346 | if (sk->sk_state == TCP_CLOSE) | |
347 | goto out; | |
348 | ||
349 | tp = tcp_sk(sk); | |
1ab1457c | 350 | seq = ntohl(th->seq); |
1da177e4 LT |
351 | if (sk->sk_state != TCP_LISTEN && |
352 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
de0744af | 353 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
354 | goto out; |
355 | } | |
356 | ||
357 | np = inet6_sk(sk); | |
358 | ||
359 | if (type == ICMPV6_PKT_TOOBIG) { | |
360 | struct dst_entry *dst = NULL; | |
361 | ||
362 | if (sock_owned_by_user(sk)) | |
363 | goto out; | |
364 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
365 | goto out; | |
366 | ||
367 | /* icmp should have updated the destination cache entry */ | |
368 | dst = __sk_dst_check(sk, np->dst_cookie); | |
369 | ||
370 | if (dst == NULL) { | |
371 | struct inet_sock *inet = inet_sk(sk); | |
372 | struct flowi fl; | |
373 | ||
374 | /* BUGGG_FUTURE: Again, it is not clear how | |
375 | to handle rthdr case. Ignore this complexity | |
376 | for now. | |
377 | */ | |
378 | memset(&fl, 0, sizeof(fl)); | |
379 | fl.proto = IPPROTO_TCP; | |
380 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
381 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
382 | fl.oif = sk->sk_bound_dev_if; | |
383 | fl.fl_ip_dport = inet->dport; | |
384 | fl.fl_ip_sport = inet->sport; | |
beb8d13b | 385 | security_skb_classify_flow(skb, &fl); |
1da177e4 LT |
386 | |
387 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
388 | sk->sk_err_soft = -err; | |
389 | goto out; | |
390 | } | |
391 | ||
392 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
393 | sk->sk_err_soft = -err; | |
394 | goto out; | |
395 | } | |
396 | ||
397 | } else | |
398 | dst_hold(dst); | |
399 | ||
d83d8461 | 400 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
1da177e4 LT |
401 | tcp_sync_mss(sk, dst_mtu(dst)); |
402 | tcp_simple_retransmit(sk); | |
403 | } /* else let the usual retransmit timer handle it */ | |
404 | dst_release(dst); | |
405 | goto out; | |
406 | } | |
407 | ||
408 | icmpv6_err_convert(type, code, &err); | |
409 | ||
60236fdd | 410 | /* Might be for an request_sock */ |
1da177e4 | 411 | switch (sk->sk_state) { |
60236fdd | 412 | struct request_sock *req, **prev; |
1da177e4 LT |
413 | case TCP_LISTEN: |
414 | if (sock_owned_by_user(sk)) | |
415 | goto out; | |
416 | ||
8129765a ACM |
417 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
418 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
419 | if (!req) |
420 | goto out; | |
421 | ||
422 | /* ICMPs are not backlogged, hence we cannot get | |
423 | * an established socket here. | |
424 | */ | |
547b792c | 425 | WARN_ON(req->sk != NULL); |
1da177e4 | 426 | |
2e6599cb | 427 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 428 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
429 | goto out; |
430 | } | |
431 | ||
463c84b9 | 432 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
433 | goto out; |
434 | ||
435 | case TCP_SYN_SENT: | |
436 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 437 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 438 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
439 | sk->sk_err = err; |
440 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
441 | ||
442 | tcp_done(sk); | |
443 | } else | |
444 | sk->sk_err_soft = err; | |
445 | goto out; | |
446 | } | |
447 | ||
448 | if (!sock_owned_by_user(sk) && np->recverr) { | |
449 | sk->sk_err = err; | |
450 | sk->sk_error_report(sk); | |
451 | } else | |
452 | sk->sk_err_soft = err; | |
453 | ||
454 | out: | |
455 | bh_unlock_sock(sk); | |
456 | sock_put(sk); | |
457 | } | |
458 | ||
459 | ||
fd80eb94 | 460 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req) |
1da177e4 | 461 | { |
ca304b61 | 462 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
463 | struct ipv6_pinfo *np = inet6_sk(sk); |
464 | struct sk_buff * skb; | |
465 | struct ipv6_txoptions *opt = NULL; | |
466 | struct in6_addr * final_p = NULL, final; | |
467 | struct flowi fl; | |
fd80eb94 | 468 | struct dst_entry *dst; |
1da177e4 LT |
469 | int err = -1; |
470 | ||
471 | memset(&fl, 0, sizeof(fl)); | |
472 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
473 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
474 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 475 | fl.fl6_flowlabel = 0; |
2e6599cb ACM |
476 | fl.oif = treq->iif; |
477 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
1da177e4 | 478 | fl.fl_ip_sport = inet_sk(sk)->sport; |
4237c75c | 479 | security_req_classify_flow(req, &fl); |
1da177e4 | 480 | |
fd80eb94 DL |
481 | opt = np->opt; |
482 | if (opt && opt->srcrt) { | |
483 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
484 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
485 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
486 | final_p = &final; | |
1da177e4 LT |
487 | } |
488 | ||
fd80eb94 DL |
489 | err = ip6_dst_lookup(sk, &dst, &fl); |
490 | if (err) | |
491 | goto done; | |
492 | if (final_p) | |
493 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
494 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
495 | goto done; | |
496 | ||
1da177e4 LT |
497 | skb = tcp_make_synack(sk, dst, req); |
498 | if (skb) { | |
aa8223c7 | 499 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
500 | |
501 | th->check = tcp_v6_check(th, skb->len, | |
2e6599cb | 502 | &treq->loc_addr, &treq->rmt_addr, |
1da177e4 LT |
503 | csum_partial((char *)th, skb->len, skb->csum)); |
504 | ||
2e6599cb | 505 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 | 506 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
b9df3cb8 | 507 | err = net_xmit_eval(err); |
1da177e4 LT |
508 | } |
509 | ||
510 | done: | |
1ab1457c | 511 | if (opt && opt != np->opt) |
1da177e4 | 512 | sock_kfree_s(sk, opt, opt->tot_len); |
78b91042 | 513 | dst_release(dst); |
1da177e4 LT |
514 | return err; |
515 | } | |
516 | ||
c6aefafb GG |
517 | static inline void syn_flood_warning(struct sk_buff *skb) |
518 | { | |
519 | #ifdef CONFIG_SYN_COOKIES | |
520 | if (sysctl_tcp_syncookies) | |
521 | printk(KERN_INFO | |
522 | "TCPv6: Possible SYN flooding on port %d. " | |
523 | "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest)); | |
524 | else | |
525 | #endif | |
526 | printk(KERN_INFO | |
527 | "TCPv6: Possible SYN flooding on port %d. " | |
528 | "Dropping request.\n", ntohs(tcp_hdr(skb)->dest)); | |
529 | } | |
530 | ||
60236fdd | 531 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 532 | { |
ca304b61 ACM |
533 | if (inet6_rsk(req)->pktopts) |
534 | kfree_skb(inet6_rsk(req)->pktopts); | |
1da177e4 LT |
535 | } |
536 | ||
cfb6eeb4 YH |
537 | #ifdef CONFIG_TCP_MD5SIG |
538 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
539 | struct in6_addr *addr) | |
540 | { | |
541 | struct tcp_sock *tp = tcp_sk(sk); | |
542 | int i; | |
543 | ||
544 | BUG_ON(tp == NULL); | |
545 | ||
546 | if (!tp->md5sig_info || !tp->md5sig_info->entries6) | |
547 | return NULL; | |
548 | ||
549 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 550 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr)) |
f8ab18d2 | 551 | return &tp->md5sig_info->keys6[i].base; |
cfb6eeb4 YH |
552 | } |
553 | return NULL; | |
554 | } | |
555 | ||
556 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
557 | struct sock *addr_sk) | |
558 | { | |
559 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); | |
560 | } | |
561 | ||
562 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
563 | struct request_sock *req) | |
564 | { | |
565 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
566 | } | |
567 | ||
568 | static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer, | |
569 | char *newkey, u8 newkeylen) | |
570 | { | |
571 | /* Add key to the list */ | |
b0a713e9 | 572 | struct tcp_md5sig_key *key; |
cfb6eeb4 YH |
573 | struct tcp_sock *tp = tcp_sk(sk); |
574 | struct tcp6_md5sig_key *keys; | |
575 | ||
b0a713e9 | 576 | key = tcp_v6_md5_do_lookup(sk, peer); |
cfb6eeb4 YH |
577 | if (key) { |
578 | /* modify existing entry - just update that one */ | |
b0a713e9 MD |
579 | kfree(key->key); |
580 | key->key = newkey; | |
581 | key->keylen = newkeylen; | |
cfb6eeb4 YH |
582 | } else { |
583 | /* reallocate new list if current one is full. */ | |
584 | if (!tp->md5sig_info) { | |
585 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC); | |
586 | if (!tp->md5sig_info) { | |
587 | kfree(newkey); | |
588 | return -ENOMEM; | |
589 | } | |
3d7dbeac | 590 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 | 591 | } |
aacbe8c8 YH |
592 | if (tcp_alloc_md5sig_pool() == NULL) { |
593 | kfree(newkey); | |
594 | return -ENOMEM; | |
595 | } | |
cfb6eeb4 YH |
596 | if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) { |
597 | keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) * | |
598 | (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC); | |
599 | ||
600 | if (!keys) { | |
601 | tcp_free_md5sig_pool(); | |
602 | kfree(newkey); | |
603 | return -ENOMEM; | |
604 | } | |
605 | ||
606 | if (tp->md5sig_info->entries6) | |
607 | memmove(keys, tp->md5sig_info->keys6, | |
608 | (sizeof (tp->md5sig_info->keys6[0]) * | |
609 | tp->md5sig_info->entries6)); | |
610 | ||
611 | kfree(tp->md5sig_info->keys6); | |
612 | tp->md5sig_info->keys6 = keys; | |
613 | tp->md5sig_info->alloced6++; | |
614 | } | |
615 | ||
616 | ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr, | |
617 | peer); | |
f8ab18d2 DM |
618 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey; |
619 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen; | |
cfb6eeb4 YH |
620 | |
621 | tp->md5sig_info->entries6++; | |
622 | } | |
623 | return 0; | |
624 | } | |
625 | ||
626 | static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk, | |
627 | u8 *newkey, __u8 newkeylen) | |
628 | { | |
629 | return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr, | |
630 | newkey, newkeylen); | |
631 | } | |
632 | ||
633 | static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer) | |
634 | { | |
635 | struct tcp_sock *tp = tcp_sk(sk); | |
636 | int i; | |
637 | ||
638 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 639 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) { |
cfb6eeb4 | 640 | /* Free the key */ |
f8ab18d2 | 641 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
642 | tp->md5sig_info->entries6--; |
643 | ||
644 | if (tp->md5sig_info->entries6 == 0) { | |
645 | kfree(tp->md5sig_info->keys6); | |
646 | tp->md5sig_info->keys6 = NULL; | |
ca983cef | 647 | tp->md5sig_info->alloced6 = 0; |
cfb6eeb4 YH |
648 | } else { |
649 | /* shrink the database */ | |
650 | if (tp->md5sig_info->entries6 != i) | |
651 | memmove(&tp->md5sig_info->keys6[i], | |
652 | &tp->md5sig_info->keys6[i+1], | |
653 | (tp->md5sig_info->entries6 - i) | |
654 | * sizeof (tp->md5sig_info->keys6[0])); | |
655 | } | |
77adefdc YH |
656 | tcp_free_md5sig_pool(); |
657 | return 0; | |
cfb6eeb4 YH |
658 | } |
659 | } | |
660 | return -ENOENT; | |
661 | } | |
662 | ||
663 | static void tcp_v6_clear_md5_list (struct sock *sk) | |
664 | { | |
665 | struct tcp_sock *tp = tcp_sk(sk); | |
666 | int i; | |
667 | ||
668 | if (tp->md5sig_info->entries6) { | |
669 | for (i = 0; i < tp->md5sig_info->entries6; i++) | |
f8ab18d2 | 670 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
671 | tp->md5sig_info->entries6 = 0; |
672 | tcp_free_md5sig_pool(); | |
673 | } | |
674 | ||
675 | kfree(tp->md5sig_info->keys6); | |
676 | tp->md5sig_info->keys6 = NULL; | |
677 | tp->md5sig_info->alloced6 = 0; | |
678 | ||
679 | if (tp->md5sig_info->entries4) { | |
680 | for (i = 0; i < tp->md5sig_info->entries4; i++) | |
f8ab18d2 | 681 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
682 | tp->md5sig_info->entries4 = 0; |
683 | tcp_free_md5sig_pool(); | |
684 | } | |
685 | ||
686 | kfree(tp->md5sig_info->keys4); | |
687 | tp->md5sig_info->keys4 = NULL; | |
688 | tp->md5sig_info->alloced4 = 0; | |
689 | } | |
690 | ||
691 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, | |
692 | int optlen) | |
693 | { | |
694 | struct tcp_md5sig cmd; | |
695 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
696 | u8 *newkey; | |
697 | ||
698 | if (optlen < sizeof(cmd)) | |
699 | return -EINVAL; | |
700 | ||
701 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
702 | return -EFAULT; | |
703 | ||
704 | if (sin6->sin6_family != AF_INET6) | |
705 | return -EINVAL; | |
706 | ||
707 | if (!cmd.tcpm_keylen) { | |
708 | if (!tcp_sk(sk)->md5sig_info) | |
709 | return -ENOENT; | |
e773e4fa | 710 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
cfb6eeb4 YH |
711 | return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]); |
712 | return tcp_v6_md5_do_del(sk, &sin6->sin6_addr); | |
713 | } | |
714 | ||
715 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
716 | return -EINVAL; | |
717 | ||
718 | if (!tcp_sk(sk)->md5sig_info) { | |
719 | struct tcp_sock *tp = tcp_sk(sk); | |
720 | struct tcp_md5sig_info *p; | |
721 | ||
722 | p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL); | |
723 | if (!p) | |
724 | return -ENOMEM; | |
725 | ||
726 | tp->md5sig_info = p; | |
3d7dbeac | 727 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 YH |
728 | } |
729 | ||
af879cc7 | 730 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
731 | if (!newkey) |
732 | return -ENOMEM; | |
e773e4fa | 733 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { |
cfb6eeb4 YH |
734 | return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3], |
735 | newkey, cmd.tcpm_keylen); | |
736 | } | |
737 | return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen); | |
738 | } | |
739 | ||
49a72dfb AL |
740 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
741 | struct in6_addr *daddr, | |
742 | struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 743 | { |
cfb6eeb4 | 744 | struct tcp6_pseudohdr *bp; |
49a72dfb | 745 | struct scatterlist sg; |
8d26d76d | 746 | |
cfb6eeb4 | 747 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 YH |
748 | /* 1. TCP pseudo-header (RFC2460) */ |
749 | ipv6_addr_copy(&bp->saddr, saddr); | |
750 | ipv6_addr_copy(&bp->daddr, daddr); | |
49a72dfb | 751 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 752 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 753 | |
49a72dfb AL |
754 | sg_init_one(&sg, bp, sizeof(*bp)); |
755 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
756 | } | |
c7da57a1 | 757 | |
49a72dfb AL |
758 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
759 | struct in6_addr *daddr, struct in6_addr *saddr, | |
760 | struct tcphdr *th) | |
761 | { | |
762 | struct tcp_md5sig_pool *hp; | |
763 | struct hash_desc *desc; | |
764 | ||
765 | hp = tcp_get_md5sig_pool(); | |
766 | if (!hp) | |
767 | goto clear_hash_noput; | |
768 | desc = &hp->md5_desc; | |
769 | ||
770 | if (crypto_hash_init(desc)) | |
771 | goto clear_hash; | |
772 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
773 | goto clear_hash; | |
774 | if (tcp_md5_hash_header(hp, th)) | |
775 | goto clear_hash; | |
776 | if (tcp_md5_hash_key(hp, key)) | |
777 | goto clear_hash; | |
778 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 779 | goto clear_hash; |
cfb6eeb4 | 780 | |
cfb6eeb4 | 781 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 782 | return 0; |
49a72dfb | 783 | |
cfb6eeb4 YH |
784 | clear_hash: |
785 | tcp_put_md5sig_pool(); | |
786 | clear_hash_noput: | |
787 | memset(md5_hash, 0, 16); | |
49a72dfb | 788 | return 1; |
cfb6eeb4 YH |
789 | } |
790 | ||
49a72dfb AL |
791 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
792 | struct sock *sk, struct request_sock *req, | |
793 | struct sk_buff *skb) | |
cfb6eeb4 YH |
794 | { |
795 | struct in6_addr *saddr, *daddr; | |
49a72dfb AL |
796 | struct tcp_md5sig_pool *hp; |
797 | struct hash_desc *desc; | |
798 | struct tcphdr *th = tcp_hdr(skb); | |
cfb6eeb4 YH |
799 | |
800 | if (sk) { | |
801 | saddr = &inet6_sk(sk)->saddr; | |
802 | daddr = &inet6_sk(sk)->daddr; | |
49a72dfb | 803 | } else if (req) { |
cfb6eeb4 YH |
804 | saddr = &inet6_rsk(req)->loc_addr; |
805 | daddr = &inet6_rsk(req)->rmt_addr; | |
49a72dfb AL |
806 | } else { |
807 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
808 | saddr = &ip6h->saddr; | |
809 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 810 | } |
49a72dfb AL |
811 | |
812 | hp = tcp_get_md5sig_pool(); | |
813 | if (!hp) | |
814 | goto clear_hash_noput; | |
815 | desc = &hp->md5_desc; | |
816 | ||
817 | if (crypto_hash_init(desc)) | |
818 | goto clear_hash; | |
819 | ||
820 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
821 | goto clear_hash; | |
822 | if (tcp_md5_hash_header(hp, th)) | |
823 | goto clear_hash; | |
824 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
825 | goto clear_hash; | |
826 | if (tcp_md5_hash_key(hp, key)) | |
827 | goto clear_hash; | |
828 | if (crypto_hash_final(desc, md5_hash)) | |
829 | goto clear_hash; | |
830 | ||
831 | tcp_put_md5sig_pool(); | |
832 | return 0; | |
833 | ||
834 | clear_hash: | |
835 | tcp_put_md5sig_pool(); | |
836 | clear_hash_noput: | |
837 | memset(md5_hash, 0, 16); | |
838 | return 1; | |
cfb6eeb4 YH |
839 | } |
840 | ||
841 | static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb) | |
842 | { | |
843 | __u8 *hash_location = NULL; | |
844 | struct tcp_md5sig_key *hash_expected; | |
0660e03f | 845 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
aa8223c7 | 846 | struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 847 | int genhash; |
cfb6eeb4 YH |
848 | u8 newhash[16]; |
849 | ||
850 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 851 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 852 | |
785957d3 DM |
853 | /* We've parsed the options - do we have a hash? */ |
854 | if (!hash_expected && !hash_location) | |
855 | return 0; | |
856 | ||
857 | if (hash_expected && !hash_location) { | |
858 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
859 | return 1; |
860 | } | |
861 | ||
785957d3 DM |
862 | if (!hash_expected && hash_location) { |
863 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
864 | return 1; |
865 | } | |
866 | ||
867 | /* check the signature */ | |
49a72dfb AL |
868 | genhash = tcp_v6_md5_hash_skb(newhash, |
869 | hash_expected, | |
870 | NULL, NULL, skb); | |
871 | ||
cfb6eeb4 YH |
872 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
873 | if (net_ratelimit()) { | |
874 | printk(KERN_INFO "MD5 Hash %s for " | |
875 | "(" NIP6_FMT ", %u)->" | |
876 | "(" NIP6_FMT ", %u)\n", | |
877 | genhash ? "failed" : "mismatch", | |
878 | NIP6(ip6h->saddr), ntohs(th->source), | |
879 | NIP6(ip6h->daddr), ntohs(th->dest)); | |
880 | } | |
881 | return 1; | |
882 | } | |
883 | return 0; | |
884 | } | |
885 | #endif | |
886 | ||
c6aefafb | 887 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 888 | .family = AF_INET6, |
2e6599cb | 889 | .obj_size = sizeof(struct tcp6_request_sock), |
1da177e4 | 890 | .rtx_syn_ack = tcp_v6_send_synack, |
60236fdd ACM |
891 | .send_ack = tcp_v6_reqsk_send_ack, |
892 | .destructor = tcp_v6_reqsk_destructor, | |
1da177e4 LT |
893 | .send_reset = tcp_v6_send_reset |
894 | }; | |
895 | ||
cfb6eeb4 | 896 | #ifdef CONFIG_TCP_MD5SIG |
b6332e6c | 897 | static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 898 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
cfb6eeb4 | 899 | }; |
b6332e6c | 900 | #endif |
cfb6eeb4 | 901 | |
6d6ee43e ACM |
902 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
903 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
904 | .twsk_unique = tcp_twsk_unique, | |
cfb6eeb4 | 905 | .twsk_destructor= tcp_twsk_destructor, |
6d6ee43e ACM |
906 | }; |
907 | ||
8292a17a | 908 | static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) |
1da177e4 LT |
909 | { |
910 | struct ipv6_pinfo *np = inet6_sk(sk); | |
aa8223c7 | 911 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 912 | |
84fa7933 | 913 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1da177e4 | 914 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); |
663ead3b | 915 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 916 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 917 | } else { |
1ab1457c YH |
918 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, |
919 | csum_partial((char *)th, th->doff<<2, | |
1da177e4 LT |
920 | skb->csum)); |
921 | } | |
922 | } | |
923 | ||
a430a43d HX |
924 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
925 | { | |
926 | struct ipv6hdr *ipv6h; | |
927 | struct tcphdr *th; | |
928 | ||
929 | if (!pskb_may_pull(skb, sizeof(*th))) | |
930 | return -EINVAL; | |
931 | ||
0660e03f | 932 | ipv6h = ipv6_hdr(skb); |
aa8223c7 | 933 | th = tcp_hdr(skb); |
a430a43d HX |
934 | |
935 | th->check = 0; | |
936 | th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, | |
937 | IPPROTO_TCP, 0); | |
663ead3b | 938 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 939 | skb->csum_offset = offsetof(struct tcphdr, check); |
84fa7933 | 940 | skb->ip_summed = CHECKSUM_PARTIAL; |
a430a43d HX |
941 | return 0; |
942 | } | |
1da177e4 | 943 | |
cfb6eeb4 | 944 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 945 | { |
aa8223c7 | 946 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
947 | struct sk_buff *buff; |
948 | struct flowi fl; | |
c346dca1 | 949 | struct net *net = dev_net(skb->dst->dev); |
e5047992 | 950 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
9cb5734e | 951 | unsigned int tot_len = sizeof(*th); |
cfb6eeb4 YH |
952 | #ifdef CONFIG_TCP_MD5SIG |
953 | struct tcp_md5sig_key *key; | |
954 | #endif | |
1da177e4 LT |
955 | |
956 | if (th->rst) | |
957 | return; | |
958 | ||
959 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 960 | return; |
1da177e4 | 961 | |
cfb6eeb4 YH |
962 | #ifdef CONFIG_TCP_MD5SIG |
963 | if (sk) | |
0660e03f | 964 | key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr); |
cfb6eeb4 YH |
965 | else |
966 | key = NULL; | |
967 | ||
968 | if (key) | |
969 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
970 | #endif | |
971 | ||
1da177e4 LT |
972 | /* |
973 | * We need to grab some memory, and put together an RST, | |
974 | * and then put it into the queue to be sent. | |
975 | */ | |
976 | ||
cfb6eeb4 | 977 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 978 | GFP_ATOMIC); |
1ab1457c YH |
979 | if (buff == NULL) |
980 | return; | |
1da177e4 | 981 | |
cfb6eeb4 | 982 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 983 | |
cfb6eeb4 | 984 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
1da177e4 LT |
985 | |
986 | /* Swap the send and the receive. */ | |
987 | memset(t1, 0, sizeof(*t1)); | |
988 | t1->dest = th->source; | |
989 | t1->source = th->dest; | |
cfb6eeb4 | 990 | t1->doff = tot_len / 4; |
1da177e4 | 991 | t1->rst = 1; |
1ab1457c | 992 | |
1da177e4 | 993 | if(th->ack) { |
1ab1457c | 994 | t1->seq = th->ack_seq; |
1da177e4 LT |
995 | } else { |
996 | t1->ack = 1; | |
997 | t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin | |
998 | + skb->len - (th->doff<<2)); | |
999 | } | |
1000 | ||
cfb6eeb4 YH |
1001 | #ifdef CONFIG_TCP_MD5SIG |
1002 | if (key) { | |
8e5200f5 | 1003 | __be32 *opt = (__be32*)(t1 + 1); |
cfb6eeb4 YH |
1004 | opt[0] = htonl((TCPOPT_NOP << 24) | |
1005 | (TCPOPT_NOP << 16) | | |
1006 | (TCPOPT_MD5SIG << 8) | | |
1007 | TCPOLEN_MD5SIG); | |
49a72dfb AL |
1008 | tcp_v6_md5_hash_hdr((__u8 *)&opt[1], key, |
1009 | &ipv6_hdr(skb)->daddr, | |
1010 | &ipv6_hdr(skb)->saddr, t1); | |
cfb6eeb4 YH |
1011 | } |
1012 | #endif | |
1013 | ||
1da177e4 LT |
1014 | buff->csum = csum_partial((char *)t1, sizeof(*t1), 0); |
1015 | ||
1016 | memset(&fl, 0, sizeof(fl)); | |
0660e03f ACM |
1017 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
1018 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1019 | |
1020 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
1021 | sizeof(*t1), IPPROTO_TCP, | |
1022 | buff->csum); | |
1023 | ||
1024 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 1025 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
1026 | fl.fl_ip_dport = t1->dest; |
1027 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 1028 | security_skb_classify_flow(skb, &fl); |
1da177e4 | 1029 | |
c20121ae DL |
1030 | /* Pass a socket to ip6_dst_lookup either it is for RST |
1031 | * Underlying function will use this to retrieve the network | |
1032 | * namespace | |
1033 | */ | |
e5047992 | 1034 | if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) { |
1da177e4 | 1035 | |
ecc51b6d | 1036 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
e5047992 | 1037 | ip6_xmit(ctl_sk, buff, &fl, NULL, 0); |
63231bdd PE |
1038 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
1039 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
1da177e4 | 1040 | return; |
ecc51b6d | 1041 | } |
1da177e4 LT |
1042 | } |
1043 | ||
1044 | kfree_skb(buff); | |
1045 | } | |
1046 | ||
9501f972 YH |
1047 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts, |
1048 | struct tcp_md5sig_key *key) | |
1da177e4 | 1049 | { |
aa8223c7 | 1050 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
1051 | struct sk_buff *buff; |
1052 | struct flowi fl; | |
c346dca1 | 1053 | struct net *net = dev_net(skb->dev); |
e5047992 | 1054 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
9cb5734e | 1055 | unsigned int tot_len = sizeof(struct tcphdr); |
e69a4adc | 1056 | __be32 *topt; |
1da177e4 LT |
1057 | |
1058 | if (ts) | |
4244f8a9 | 1059 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 YH |
1060 | #ifdef CONFIG_TCP_MD5SIG |
1061 | if (key) | |
1062 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
1063 | #endif | |
1da177e4 LT |
1064 | |
1065 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, | |
1066 | GFP_ATOMIC); | |
1067 | if (buff == NULL) | |
1068 | return; | |
1069 | ||
1070 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); | |
1071 | ||
1072 | t1 = (struct tcphdr *) skb_push(buff,tot_len); | |
1073 | ||
1074 | /* Swap the send and the receive. */ | |
1075 | memset(t1, 0, sizeof(*t1)); | |
1076 | t1->dest = th->source; | |
1077 | t1->source = th->dest; | |
1078 | t1->doff = tot_len/4; | |
1079 | t1->seq = htonl(seq); | |
1080 | t1->ack_seq = htonl(ack); | |
1081 | t1->ack = 1; | |
1082 | t1->window = htons(win); | |
cfb6eeb4 | 1083 | |
e69a4adc | 1084 | topt = (__be32 *)(t1 + 1); |
1ab1457c | 1085 | |
1da177e4 | 1086 | if (ts) { |
cfb6eeb4 YH |
1087 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
1088 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
1089 | *topt++ = htonl(tcp_time_stamp); | |
1090 | *topt = htonl(ts); | |
1da177e4 LT |
1091 | } |
1092 | ||
cfb6eeb4 YH |
1093 | #ifdef CONFIG_TCP_MD5SIG |
1094 | if (key) { | |
1095 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
1096 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
49a72dfb | 1097 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, |
90b7e112 AL |
1098 | &ipv6_hdr(skb)->saddr, |
1099 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
1100 | } |
1101 | #endif | |
1102 | ||
1da177e4 LT |
1103 | buff->csum = csum_partial((char *)t1, tot_len, 0); |
1104 | ||
1105 | memset(&fl, 0, sizeof(fl)); | |
0660e03f ACM |
1106 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
1107 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1108 | |
1109 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
1110 | tot_len, IPPROTO_TCP, | |
1111 | buff->csum); | |
1112 | ||
1113 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 1114 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
1115 | fl.fl_ip_dport = t1->dest; |
1116 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 1117 | security_skb_classify_flow(skb, &fl); |
1da177e4 | 1118 | |
e5047992 | 1119 | if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) { |
ecc51b6d | 1120 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
e5047992 | 1121 | ip6_xmit(ctl_sk, buff, &fl, NULL, 0); |
63231bdd | 1122 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
1da177e4 | 1123 | return; |
ecc51b6d | 1124 | } |
1da177e4 LT |
1125 | } |
1126 | ||
1127 | kfree_skb(buff); | |
1128 | } | |
1129 | ||
1130 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1131 | { | |
8feaf0c0 | 1132 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 1133 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 1134 | |
9501f972 | 1135 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 1136 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
9501f972 | 1137 | tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw)); |
1da177e4 | 1138 | |
8feaf0c0 | 1139 | inet_twsk_put(tw); |
1da177e4 LT |
1140 | } |
1141 | ||
6edafaaf GJ |
1142 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
1143 | struct request_sock *req) | |
1da177e4 | 1144 | { |
9501f972 | 1145 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent, |
6edafaaf | 1146 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr)); |
1da177e4 LT |
1147 | } |
1148 | ||
1149 | ||
1150 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
1151 | { | |
60236fdd | 1152 | struct request_sock *req, **prev; |
aa8223c7 | 1153 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
1154 | struct sock *nsk; |
1155 | ||
1156 | /* Find possible connection requests. */ | |
8129765a | 1157 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
1158 | &ipv6_hdr(skb)->saddr, |
1159 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 LT |
1160 | if (req) |
1161 | return tcp_check_req(sk, skb, req, prev); | |
1162 | ||
3b1e0a65 | 1163 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
1164 | &ipv6_hdr(skb)->saddr, th->source, |
1165 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
1166 | |
1167 | if (nsk) { | |
1168 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1169 | bh_lock_sock(nsk); | |
1170 | return nsk; | |
1171 | } | |
9469c7b4 | 1172 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1173 | return NULL; |
1174 | } | |
1175 | ||
c6aefafb | 1176 | #ifdef CONFIG_SYN_COOKIES |
1da177e4 | 1177 | if (!th->rst && !th->syn && th->ack) |
c6aefafb | 1178 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1179 | #endif |
1180 | return sk; | |
1181 | } | |
1182 | ||
1da177e4 LT |
1183 | /* FIXME: this is substantially similar to the ipv4 code. |
1184 | * Can some kind of merge be done? -- erics | |
1185 | */ | |
1186 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1187 | { | |
ca304b61 | 1188 | struct inet6_request_sock *treq; |
1da177e4 LT |
1189 | struct ipv6_pinfo *np = inet6_sk(sk); |
1190 | struct tcp_options_received tmp_opt; | |
1191 | struct tcp_sock *tp = tcp_sk(sk); | |
60236fdd | 1192 | struct request_sock *req = NULL; |
1da177e4 | 1193 | __u32 isn = TCP_SKB_CB(skb)->when; |
c6aefafb GG |
1194 | #ifdef CONFIG_SYN_COOKIES |
1195 | int want_cookie = 0; | |
1196 | #else | |
1197 | #define want_cookie 0 | |
1198 | #endif | |
1da177e4 LT |
1199 | |
1200 | if (skb->protocol == htons(ETH_P_IP)) | |
1201 | return tcp_v4_conn_request(sk, skb); | |
1202 | ||
1203 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1204 | goto drop; |
1da177e4 | 1205 | |
463c84b9 | 1206 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 | 1207 | if (net_ratelimit()) |
c6aefafb GG |
1208 | syn_flood_warning(skb); |
1209 | #ifdef CONFIG_SYN_COOKIES | |
1210 | if (sysctl_tcp_syncookies) | |
1211 | want_cookie = 1; | |
1212 | else | |
1213 | #endif | |
1ab1457c | 1214 | goto drop; |
1da177e4 LT |
1215 | } |
1216 | ||
463c84b9 | 1217 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1218 | goto drop; |
1219 | ||
ca304b61 | 1220 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1221 | if (req == NULL) |
1222 | goto drop; | |
1223 | ||
cfb6eeb4 YH |
1224 | #ifdef CONFIG_TCP_MD5SIG |
1225 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
1226 | #endif | |
1227 | ||
1da177e4 LT |
1228 | tcp_clear_options(&tmp_opt); |
1229 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1230 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
1231 | ||
1232 | tcp_parse_options(skb, &tmp_opt, 0); | |
1233 | ||
4dfc2817 | 1234 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 1235 | tcp_clear_options(&tmp_opt); |
c6aefafb | 1236 | |
1da177e4 LT |
1237 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1238 | tcp_openreq_init(req, &tmp_opt, skb); | |
1239 | ||
ca304b61 | 1240 | treq = inet6_rsk(req); |
0660e03f ACM |
1241 | ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr); |
1242 | ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr); | |
c6aefafb GG |
1243 | if (!want_cookie) |
1244 | TCP_ECN_create_request(req, tcp_hdr(skb)); | |
1245 | ||
1246 | if (want_cookie) { | |
1247 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); | |
4dfc2817 | 1248 | req->cookie_ts = tmp_opt.tstamp_ok; |
c6aefafb GG |
1249 | } else if (!isn) { |
1250 | if (ipv6_opt_accepted(sk, skb) || | |
1251 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1252 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1253 | atomic_inc(&skb->users); | |
1254 | treq->pktopts = skb; | |
1255 | } | |
1256 | treq->iif = sk->sk_bound_dev_if; | |
1da177e4 | 1257 | |
c6aefafb GG |
1258 | /* So that link locals have meaning */ |
1259 | if (!sk->sk_bound_dev_if && | |
1260 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1261 | treq->iif = inet6_iif(skb); | |
1da177e4 | 1262 | |
a94f723d | 1263 | isn = tcp_v6_init_sequence(skb); |
c6aefafb | 1264 | } |
1da177e4 | 1265 | |
2e6599cb | 1266 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1267 | |
4237c75c VY |
1268 | security_inet_conn_request(sk, skb, req); |
1269 | ||
fd80eb94 | 1270 | if (tcp_v6_send_synack(sk, req)) |
1da177e4 LT |
1271 | goto drop; |
1272 | ||
c6aefafb GG |
1273 | if (!want_cookie) { |
1274 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); | |
1275 | return 0; | |
1276 | } | |
1da177e4 LT |
1277 | |
1278 | drop: | |
1279 | if (req) | |
60236fdd | 1280 | reqsk_free(req); |
1da177e4 | 1281 | |
1da177e4 LT |
1282 | return 0; /* don't send reset */ |
1283 | } | |
1284 | ||
1285 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1286 | struct request_sock *req, |
1da177e4 LT |
1287 | struct dst_entry *dst) |
1288 | { | |
78d15e82 | 1289 | struct inet6_request_sock *treq; |
1da177e4 LT |
1290 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1291 | struct tcp6_sock *newtcp6sk; | |
1292 | struct inet_sock *newinet; | |
1293 | struct tcp_sock *newtp; | |
1294 | struct sock *newsk; | |
1295 | struct ipv6_txoptions *opt; | |
cfb6eeb4 YH |
1296 | #ifdef CONFIG_TCP_MD5SIG |
1297 | struct tcp_md5sig_key *key; | |
1298 | #endif | |
1da177e4 LT |
1299 | |
1300 | if (skb->protocol == htons(ETH_P_IP)) { | |
1301 | /* | |
1302 | * v6 mapped | |
1303 | */ | |
1304 | ||
1305 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1306 | ||
1ab1457c | 1307 | if (newsk == NULL) |
1da177e4 LT |
1308 | return NULL; |
1309 | ||
1310 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1311 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1312 | ||
1313 | newinet = inet_sk(newsk); | |
1314 | newnp = inet6_sk(newsk); | |
1315 | newtp = tcp_sk(newsk); | |
1316 | ||
1317 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1318 | ||
1319 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
1320 | newinet->daddr); | |
1321 | ||
1322 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
1323 | newinet->saddr); | |
1324 | ||
1325 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1326 | ||
8292a17a | 1327 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1328 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1329 | #ifdef CONFIG_TCP_MD5SIG |
1330 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1331 | #endif | |
1332 | ||
1da177e4 LT |
1333 | newnp->pktoptions = NULL; |
1334 | newnp->opt = NULL; | |
505cbfc5 | 1335 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1336 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 | 1337 | |
e6848976 ACM |
1338 | /* |
1339 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1340 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1341 | * that function for the gory details. -acme | |
1da177e4 | 1342 | */ |
1da177e4 LT |
1343 | |
1344 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1345 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1346 | Sync it now. |
1347 | */ | |
d83d8461 | 1348 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1349 | |
1350 | return newsk; | |
1351 | } | |
1352 | ||
78d15e82 | 1353 | treq = inet6_rsk(req); |
1da177e4 LT |
1354 | opt = np->opt; |
1355 | ||
1356 | if (sk_acceptq_is_full(sk)) | |
1357 | goto out_overflow; | |
1358 | ||
1da177e4 LT |
1359 | if (dst == NULL) { |
1360 | struct in6_addr *final_p = NULL, final; | |
1361 | struct flowi fl; | |
1362 | ||
1363 | memset(&fl, 0, sizeof(fl)); | |
1364 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1365 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
1366 | if (opt && opt->srcrt) { |
1367 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1368 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1369 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1370 | final_p = &final; | |
1371 | } | |
2e6599cb | 1372 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1373 | fl.oif = sk->sk_bound_dev_if; |
2e6599cb | 1374 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
1da177e4 | 1375 | fl.fl_ip_sport = inet_sk(sk)->sport; |
4237c75c | 1376 | security_req_classify_flow(req, &fl); |
1da177e4 LT |
1377 | |
1378 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1379 | goto out; | |
1380 | ||
1381 | if (final_p) | |
1382 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1383 | ||
1384 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
1385 | goto out; | |
1ab1457c | 1386 | } |
1da177e4 LT |
1387 | |
1388 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1389 | if (newsk == NULL) | |
1390 | goto out; | |
1391 | ||
e6848976 ACM |
1392 | /* |
1393 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1394 | * count here, tcp_create_openreq_child now does this for us, see the | |
1395 | * comment in that function for the gory details. -acme | |
1396 | */ | |
1da177e4 | 1397 | |
59eed279 | 1398 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1399 | __ip6_dst_store(newsk, dst, NULL, NULL); |
1da177e4 LT |
1400 | |
1401 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1402 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1403 | ||
1404 | newtp = tcp_sk(newsk); | |
1405 | newinet = inet_sk(newsk); | |
1406 | newnp = inet6_sk(newsk); | |
1407 | ||
1408 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1409 | ||
2e6599cb ACM |
1410 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1411 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1412 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1413 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 | 1414 | |
1ab1457c | 1415 | /* Now IPv6 options... |
1da177e4 LT |
1416 | |
1417 | First: no IPv4 options. | |
1418 | */ | |
1419 | newinet->opt = NULL; | |
d35690be | 1420 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1421 | |
1422 | /* Clone RX bits */ | |
1423 | newnp->rxopt.all = np->rxopt.all; | |
1424 | ||
1425 | /* Clone pktoptions received with SYN */ | |
1426 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1427 | if (treq->pktopts != NULL) { |
1428 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1429 | kfree_skb(treq->pktopts); | |
1430 | treq->pktopts = NULL; | |
1da177e4 LT |
1431 | if (newnp->pktoptions) |
1432 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1433 | } | |
1434 | newnp->opt = NULL; | |
505cbfc5 | 1435 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1436 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
1437 | |
1438 | /* Clone native IPv6 options from listening socket (if any) | |
1439 | ||
1440 | Yes, keeping reference count would be much more clever, | |
1441 | but we make one more one thing there: reattach optmem | |
1442 | to newsk. | |
1443 | */ | |
1444 | if (opt) { | |
1445 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1446 | if (opt != np->opt) | |
1447 | sock_kfree_s(sk, opt, opt->tot_len); | |
1448 | } | |
1449 | ||
d83d8461 | 1450 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1451 | if (newnp->opt) |
d83d8461 ACM |
1452 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1453 | newnp->opt->opt_flen); | |
1da177e4 | 1454 | |
5d424d5a | 1455 | tcp_mtup_init(newsk); |
1da177e4 LT |
1456 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1457 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1458 | tcp_initialize_rcv_mss(newsk); | |
1459 | ||
1460 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
1461 | ||
cfb6eeb4 YH |
1462 | #ifdef CONFIG_TCP_MD5SIG |
1463 | /* Copy over the MD5 key from the original socket */ | |
1464 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1465 | /* We're using one, so create a matching key | |
1466 | * on the newsk structure. If we fail to get | |
1467 | * memory, then we end up not copying the key | |
1468 | * across. Shucks. | |
1469 | */ | |
af879cc7 ACM |
1470 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1471 | if (newkey != NULL) | |
cfb6eeb4 YH |
1472 | tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr, |
1473 | newkey, key->keylen); | |
cfb6eeb4 YH |
1474 | } |
1475 | #endif | |
1476 | ||
ab1e0a13 | 1477 | __inet6_hash(newsk); |
e56d8b8a | 1478 | __inet_inherit_port(sk, newsk); |
1da177e4 LT |
1479 | |
1480 | return newsk; | |
1481 | ||
1482 | out_overflow: | |
de0744af | 1483 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
1da177e4 | 1484 | out: |
de0744af | 1485 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1486 | if (opt && opt != np->opt) |
1487 | sock_kfree_s(sk, opt, opt->tot_len); | |
1488 | dst_release(dst); | |
1489 | return NULL; | |
1490 | } | |
1491 | ||
b51655b9 | 1492 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1493 | { |
84fa7933 | 1494 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
aa8223c7 | 1495 | if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1496 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1497 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1498 | return 0; |
fb286bb2 | 1499 | } |
1da177e4 | 1500 | } |
fb286bb2 | 1501 | |
aa8223c7 | 1502 | skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len, |
0660e03f ACM |
1503 | &ipv6_hdr(skb)->saddr, |
1504 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1505 | |
1da177e4 | 1506 | if (skb->len <= 76) { |
fb286bb2 | 1507 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1508 | } |
1509 | return 0; | |
1510 | } | |
1511 | ||
1512 | /* The socket must have it's spinlock held when we get | |
1513 | * here. | |
1514 | * | |
1515 | * We have a potential double-lock case here, so even when | |
1516 | * doing backlog processing we use the BH locking scheme. | |
1517 | * This is because we cannot sleep with the original spinlock | |
1518 | * held. | |
1519 | */ | |
1520 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1521 | { | |
1522 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1523 | struct tcp_sock *tp; | |
1524 | struct sk_buff *opt_skb = NULL; | |
1525 | ||
1526 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1527 | goes to IPv4 receive handler and backlogged. | |
1528 | From backlog it always goes here. Kerboom... | |
1529 | Fortunately, tcp_rcv_established and rcv_established | |
1530 | handle them correctly, but it is not case with | |
1531 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1532 | */ | |
1533 | ||
1534 | if (skb->protocol == htons(ETH_P_IP)) | |
1535 | return tcp_v4_do_rcv(sk, skb); | |
1536 | ||
cfb6eeb4 YH |
1537 | #ifdef CONFIG_TCP_MD5SIG |
1538 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1539 | goto discard; | |
1540 | #endif | |
1541 | ||
fda9ef5d | 1542 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1543 | goto discard; |
1544 | ||
1545 | /* | |
1546 | * socket locking is here for SMP purposes as backlog rcv | |
1547 | * is currently called with bh processing disabled. | |
1548 | */ | |
1549 | ||
1550 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1551 | ||
1552 | Yes, guys, it is the only place in our code, where we | |
1553 | may make it not affecting IPv4. | |
1554 | The rest of code is protocol independent, | |
1555 | and I do not like idea to uglify IPv4. | |
1556 | ||
1557 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1558 | looks not very well thought. For now we latch | |
1559 | options, received in the last packet, enqueued | |
1560 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1561 | --ANK (980728) |
1da177e4 LT |
1562 | */ |
1563 | if (np->rxopt.all) | |
1564 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1565 | ||
1566 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1567 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1568 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1569 | goto reset; |
1570 | TCP_CHECK_TIMER(sk); | |
1571 | if (opt_skb) | |
1572 | goto ipv6_pktoptions; | |
1573 | return 0; | |
1574 | } | |
1575 | ||
ab6a5bb6 | 1576 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1577 | goto csum_err; |
1578 | ||
1ab1457c | 1579 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1580 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1581 | if (!nsk) | |
1582 | goto discard; | |
1583 | ||
1584 | /* | |
1585 | * Queue it on the new socket if the new socket is active, | |
1586 | * otherwise we just shortcircuit this and continue with | |
1587 | * the new socket.. | |
1588 | */ | |
1ab1457c | 1589 | if(nsk != sk) { |
1da177e4 LT |
1590 | if (tcp_child_process(sk, nsk, skb)) |
1591 | goto reset; | |
1592 | if (opt_skb) | |
1593 | __kfree_skb(opt_skb); | |
1594 | return 0; | |
1595 | } | |
1596 | } | |
1597 | ||
1598 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1599 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1600 | goto reset; |
1601 | TCP_CHECK_TIMER(sk); | |
1602 | if (opt_skb) | |
1603 | goto ipv6_pktoptions; | |
1604 | return 0; | |
1605 | ||
1606 | reset: | |
cfb6eeb4 | 1607 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1608 | discard: |
1609 | if (opt_skb) | |
1610 | __kfree_skb(opt_skb); | |
1611 | kfree_skb(skb); | |
1612 | return 0; | |
1613 | csum_err: | |
63231bdd | 1614 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1615 | goto discard; |
1616 | ||
1617 | ||
1618 | ipv6_pktoptions: | |
1619 | /* Do you ask, what is it? | |
1620 | ||
1621 | 1. skb was enqueued by tcp. | |
1622 | 2. skb is added to tail of read queue, rather than out of order. | |
1623 | 3. socket is not in passive state. | |
1624 | 4. Finally, it really contains options, which user wants to receive. | |
1625 | */ | |
1626 | tp = tcp_sk(sk); | |
1627 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1628 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1629 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1630 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1631 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1632 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
1da177e4 LT |
1633 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1634 | skb_set_owner_r(opt_skb, sk); | |
1635 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1636 | } else { | |
1637 | __kfree_skb(opt_skb); | |
1638 | opt_skb = xchg(&np->pktoptions, NULL); | |
1639 | } | |
1640 | } | |
1641 | ||
1642 | if (opt_skb) | |
1643 | kfree_skb(opt_skb); | |
1644 | return 0; | |
1645 | } | |
1646 | ||
e5bbef20 | 1647 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1648 | { |
1ab1457c | 1649 | struct tcphdr *th; |
1da177e4 LT |
1650 | struct sock *sk; |
1651 | int ret; | |
a86b1e30 | 1652 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1653 | |
1654 | if (skb->pkt_type != PACKET_HOST) | |
1655 | goto discard_it; | |
1656 | ||
1657 | /* | |
1658 | * Count it even if it's bad. | |
1659 | */ | |
63231bdd | 1660 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1661 | |
1662 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1663 | goto discard_it; | |
1664 | ||
aa8223c7 | 1665 | th = tcp_hdr(skb); |
1da177e4 LT |
1666 | |
1667 | if (th->doff < sizeof(struct tcphdr)/4) | |
1668 | goto bad_packet; | |
1669 | if (!pskb_may_pull(skb, th->doff*4)) | |
1670 | goto discard_it; | |
1671 | ||
60476372 | 1672 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1da177e4 LT |
1673 | goto bad_packet; |
1674 | ||
aa8223c7 | 1675 | th = tcp_hdr(skb); |
1da177e4 LT |
1676 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1677 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1678 | skb->len - th->doff*4); | |
1679 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1680 | TCP_SKB_CB(skb)->when = 0; | |
0660e03f | 1681 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 LT |
1682 | TCP_SKB_CB(skb)->sacked = 0; |
1683 | ||
a86b1e30 | 1684 | sk = __inet6_lookup(net, &tcp_hashinfo, |
d86e0dac PE |
1685 | &ipv6_hdr(skb)->saddr, th->source, |
1686 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), | |
1687 | inet6_iif(skb)); | |
1da177e4 LT |
1688 | |
1689 | if (!sk) | |
1690 | goto no_tcp_socket; | |
1691 | ||
1692 | process: | |
1693 | if (sk->sk_state == TCP_TIME_WAIT) | |
1694 | goto do_time_wait; | |
1695 | ||
1696 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1697 | goto discard_and_relse; | |
1698 | ||
fda9ef5d | 1699 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1700 | goto discard_and_relse; |
1701 | ||
1702 | skb->dev = NULL; | |
1703 | ||
293b9c42 | 1704 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1705 | ret = 0; |
1706 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1707 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1708 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a DM |
1709 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
1710 | tp->ucopy.dma_chan = get_softnet_dma(); | |
1ab1457c YH |
1711 | if (tp->ucopy.dma_chan) |
1712 | ret = tcp_v6_do_rcv(sk, skb); | |
1713 | else | |
1a2449a8 CL |
1714 | #endif |
1715 | { | |
1716 | if (!tcp_prequeue(sk, skb)) | |
1717 | ret = tcp_v6_do_rcv(sk, skb); | |
1718 | } | |
1da177e4 LT |
1719 | } else |
1720 | sk_add_backlog(sk, skb); | |
1721 | bh_unlock_sock(sk); | |
1722 | ||
1723 | sock_put(sk); | |
1724 | return ret ? -1 : 0; | |
1725 | ||
1726 | no_tcp_socket: | |
1727 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1728 | goto discard_it; | |
1729 | ||
1730 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1731 | bad_packet: | |
63231bdd | 1732 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1733 | } else { |
cfb6eeb4 | 1734 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1735 | } |
1736 | ||
1737 | discard_it: | |
1738 | ||
1739 | /* | |
1740 | * Discard frame | |
1741 | */ | |
1742 | ||
1743 | kfree_skb(skb); | |
1744 | return 0; | |
1745 | ||
1746 | discard_and_relse: | |
1747 | sock_put(sk); | |
1748 | goto discard_it; | |
1749 | ||
1750 | do_time_wait: | |
1751 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1752 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1753 | goto discard_it; |
1754 | } | |
1755 | ||
1756 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
63231bdd | 1757 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
9469c7b4 | 1758 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1759 | goto discard_it; |
1760 | } | |
1761 | ||
9469c7b4 | 1762 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1763 | case TCP_TW_SYN: |
1764 | { | |
1765 | struct sock *sk2; | |
1766 | ||
c346dca1 | 1767 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
0660e03f | 1768 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1769 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1770 | if (sk2 != NULL) { |
295ff7ed ACM |
1771 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1772 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1773 | inet_twsk_put(tw); | |
1da177e4 LT |
1774 | sk = sk2; |
1775 | goto process; | |
1776 | } | |
1777 | /* Fall through to ACK */ | |
1778 | } | |
1779 | case TCP_TW_ACK: | |
1780 | tcp_v6_timewait_ack(sk, skb); | |
1781 | break; | |
1782 | case TCP_TW_RST: | |
1783 | goto no_tcp_socket; | |
1784 | case TCP_TW_SUCCESS:; | |
1785 | } | |
1786 | goto discard_it; | |
1787 | } | |
1788 | ||
1da177e4 LT |
1789 | static int tcp_v6_remember_stamp(struct sock *sk) |
1790 | { | |
1791 | /* Alas, not yet... */ | |
1792 | return 0; | |
1793 | } | |
1794 | ||
8292a17a | 1795 | static struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1796 | .queue_xmit = inet6_csk_xmit, |
1797 | .send_check = tcp_v6_send_check, | |
1798 | .rebuild_header = inet6_sk_rebuild_header, | |
1799 | .conn_request = tcp_v6_conn_request, | |
1800 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1801 | .remember_stamp = tcp_v6_remember_stamp, | |
1802 | .net_header_len = sizeof(struct ipv6hdr), | |
1803 | .setsockopt = ipv6_setsockopt, | |
1804 | .getsockopt = ipv6_getsockopt, | |
1805 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1806 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1807 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1808 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1809 | .compat_setsockopt = compat_ipv6_setsockopt, |
1810 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1811 | #endif |
1da177e4 LT |
1812 | }; |
1813 | ||
cfb6eeb4 | 1814 | #ifdef CONFIG_TCP_MD5SIG |
a928630a | 1815 | static struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1816 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1817 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 YH |
1818 | .md5_add = tcp_v6_md5_add_func, |
1819 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1820 | }; |
a928630a | 1821 | #endif |
cfb6eeb4 | 1822 | |
1da177e4 LT |
1823 | /* |
1824 | * TCP over IPv4 via INET6 API | |
1825 | */ | |
1826 | ||
8292a17a | 1827 | static struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1828 | .queue_xmit = ip_queue_xmit, |
1829 | .send_check = tcp_v4_send_check, | |
1830 | .rebuild_header = inet_sk_rebuild_header, | |
1831 | .conn_request = tcp_v6_conn_request, | |
1832 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1833 | .remember_stamp = tcp_v4_remember_stamp, | |
1834 | .net_header_len = sizeof(struct iphdr), | |
1835 | .setsockopt = ipv6_setsockopt, | |
1836 | .getsockopt = ipv6_getsockopt, | |
1837 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1838 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1839 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1840 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1841 | .compat_setsockopt = compat_ipv6_setsockopt, |
1842 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1843 | #endif |
1da177e4 LT |
1844 | }; |
1845 | ||
cfb6eeb4 | 1846 | #ifdef CONFIG_TCP_MD5SIG |
a928630a | 1847 | static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1848 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1849 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 YH |
1850 | .md5_add = tcp_v6_md5_add_func, |
1851 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1852 | }; |
a928630a | 1853 | #endif |
cfb6eeb4 | 1854 | |
1da177e4 LT |
1855 | /* NOTE: A lot of things set to zero explicitly by call to |
1856 | * sk_alloc() so need not be done here. | |
1857 | */ | |
1858 | static int tcp_v6_init_sock(struct sock *sk) | |
1859 | { | |
6687e988 | 1860 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1861 | struct tcp_sock *tp = tcp_sk(sk); |
1862 | ||
1863 | skb_queue_head_init(&tp->out_of_order_queue); | |
1864 | tcp_init_xmit_timers(sk); | |
1865 | tcp_prequeue_init(tp); | |
1866 | ||
6687e988 | 1867 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1868 | tp->mdev = TCP_TIMEOUT_INIT; |
1869 | ||
1870 | /* So many TCP implementations out there (incorrectly) count the | |
1871 | * initial SYN frame in their delayed-ACK and congestion control | |
1872 | * algorithms that we must have the following bandaid to talk | |
1873 | * efficiently to them. -DaveM | |
1874 | */ | |
1875 | tp->snd_cwnd = 2; | |
1876 | ||
1877 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1878 | * initialization of these values. | |
1879 | */ | |
1880 | tp->snd_ssthresh = 0x7fffffff; | |
1881 | tp->snd_cwnd_clamp = ~0; | |
c1b4a7e6 | 1882 | tp->mss_cache = 536; |
1da177e4 LT |
1883 | |
1884 | tp->reordering = sysctl_tcp_reordering; | |
1885 | ||
1886 | sk->sk_state = TCP_CLOSE; | |
1887 | ||
8292a17a | 1888 | icsk->icsk_af_ops = &ipv6_specific; |
6687e988 | 1889 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
d83d8461 | 1890 | icsk->icsk_sync_mss = tcp_sync_mss; |
1da177e4 LT |
1891 | sk->sk_write_space = sk_stream_write_space; |
1892 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1893 | ||
cfb6eeb4 YH |
1894 | #ifdef CONFIG_TCP_MD5SIG |
1895 | tp->af_specific = &tcp_sock_ipv6_specific; | |
1896 | #endif | |
1897 | ||
1da177e4 LT |
1898 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
1899 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1900 | ||
1901 | atomic_inc(&tcp_sockets_allocated); | |
1902 | ||
1903 | return 0; | |
1904 | } | |
1905 | ||
7d06b2e0 | 1906 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1907 | { |
cfb6eeb4 YH |
1908 | #ifdef CONFIG_TCP_MD5SIG |
1909 | /* Clean up the MD5 key list */ | |
1910 | if (tcp_sk(sk)->md5sig_info) | |
1911 | tcp_v6_clear_md5_list(sk); | |
1912 | #endif | |
1da177e4 | 1913 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1914 | inet6_destroy_sock(sk); |
1da177e4 LT |
1915 | } |
1916 | ||
952a10be | 1917 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1918 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1919 | static void get_openreq6(struct seq_file *seq, |
60236fdd | 1920 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 1921 | { |
1da177e4 | 1922 | int ttd = req->expires - jiffies; |
ca304b61 ACM |
1923 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1924 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1925 | |
1926 | if (ttd < 0) | |
1927 | ttd = 0; | |
1928 | ||
1da177e4 LT |
1929 | seq_printf(seq, |
1930 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1931 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1932 | i, | |
1933 | src->s6_addr32[0], src->s6_addr32[1], | |
1934 | src->s6_addr32[2], src->s6_addr32[3], | |
1935 | ntohs(inet_sk(sk)->sport), | |
1936 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1937 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1938 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1939 | TCP_SYN_RECV, |
1940 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
1941 | 1, /* timers active (only the expire timer) */ |
1942 | jiffies_to_clock_t(ttd), | |
1da177e4 LT |
1943 | req->retrans, |
1944 | uid, | |
1ab1457c | 1945 | 0, /* non standard timer */ |
1da177e4 LT |
1946 | 0, /* open_requests have no inode */ |
1947 | 0, req); | |
1948 | } | |
1949 | ||
1950 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1951 | { | |
1952 | struct in6_addr *dest, *src; | |
1953 | __u16 destp, srcp; | |
1954 | int timer_active; | |
1955 | unsigned long timer_expires; | |
1956 | struct inet_sock *inet = inet_sk(sp); | |
1957 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1958 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
1959 | struct ipv6_pinfo *np = inet6_sk(sp); |
1960 | ||
1961 | dest = &np->daddr; | |
1962 | src = &np->rcv_saddr; | |
1963 | destp = ntohs(inet->dport); | |
1964 | srcp = ntohs(inet->sport); | |
463c84b9 ACM |
1965 | |
1966 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1967 | timer_active = 1; |
463c84b9 ACM |
1968 | timer_expires = icsk->icsk_timeout; |
1969 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1970 | timer_active = 4; |
463c84b9 | 1971 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1972 | } else if (timer_pending(&sp->sk_timer)) { |
1973 | timer_active = 2; | |
1974 | timer_expires = sp->sk_timer.expires; | |
1975 | } else { | |
1976 | timer_active = 0; | |
1977 | timer_expires = jiffies; | |
1978 | } | |
1979 | ||
1980 | seq_printf(seq, | |
1981 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
7be87351 | 1982 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n", |
1da177e4 LT |
1983 | i, |
1984 | src->s6_addr32[0], src->s6_addr32[1], | |
1985 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1986 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1987 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1988 | sp->sk_state, |
47da8ee6 SS |
1989 | tp->write_seq-tp->snd_una, |
1990 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 LT |
1991 | timer_active, |
1992 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 1993 | icsk->icsk_retransmits, |
1da177e4 | 1994 | sock_i_uid(sp), |
6687e988 | 1995 | icsk->icsk_probes_out, |
1da177e4 LT |
1996 | sock_i_ino(sp), |
1997 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1998 | jiffies_to_clock_t(icsk->icsk_rto), |
1999 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 2000 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
1da177e4 LT |
2001 | tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh |
2002 | ); | |
2003 | } | |
2004 | ||
1ab1457c | 2005 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 2006 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
2007 | { |
2008 | struct in6_addr *dest, *src; | |
2009 | __u16 destp, srcp; | |
0fa1a53e | 2010 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
2011 | int ttd = tw->tw_ttd - jiffies; |
2012 | ||
2013 | if (ttd < 0) | |
2014 | ttd = 0; | |
2015 | ||
0fa1a53e ACM |
2016 | dest = &tw6->tw_v6_daddr; |
2017 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
2018 | destp = ntohs(tw->tw_dport); |
2019 | srcp = ntohs(tw->tw_sport); | |
2020 | ||
2021 | seq_printf(seq, | |
2022 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2023 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
2024 | i, | |
2025 | src->s6_addr32[0], src->s6_addr32[1], | |
2026 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2027 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2028 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2029 | tw->tw_substate, 0, 0, | |
2030 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2031 | atomic_read(&tw->tw_refcnt), tw); | |
2032 | } | |
2033 | ||
1da177e4 LT |
2034 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
2035 | { | |
2036 | struct tcp_iter_state *st; | |
2037 | ||
2038 | if (v == SEQ_START_TOKEN) { | |
2039 | seq_puts(seq, | |
2040 | " sl " | |
2041 | "local_address " | |
2042 | "remote_address " | |
2043 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2044 | " uid timeout inode\n"); | |
2045 | goto out; | |
2046 | } | |
2047 | st = seq->private; | |
2048 | ||
2049 | switch (st->state) { | |
2050 | case TCP_SEQ_STATE_LISTENING: | |
2051 | case TCP_SEQ_STATE_ESTABLISHED: | |
2052 | get_tcp6_sock(seq, v, st->num); | |
2053 | break; | |
2054 | case TCP_SEQ_STATE_OPENREQ: | |
2055 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
2056 | break; | |
2057 | case TCP_SEQ_STATE_TIME_WAIT: | |
2058 | get_timewait6_sock(seq, v, st->num); | |
2059 | break; | |
2060 | } | |
2061 | out: | |
2062 | return 0; | |
2063 | } | |
2064 | ||
1da177e4 | 2065 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
2066 | .name = "tcp6", |
2067 | .family = AF_INET6, | |
5f4472c5 DL |
2068 | .seq_fops = { |
2069 | .owner = THIS_MODULE, | |
2070 | }, | |
9427c4b3 DL |
2071 | .seq_ops = { |
2072 | .show = tcp6_seq_show, | |
2073 | }, | |
1da177e4 LT |
2074 | }; |
2075 | ||
6f8b13bc | 2076 | int tcp6_proc_init(struct net *net) |
1da177e4 | 2077 | { |
6f8b13bc | 2078 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2079 | } |
2080 | ||
6f8b13bc | 2081 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2082 | { |
6f8b13bc | 2083 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2084 | } |
2085 | #endif | |
2086 | ||
2087 | struct proto tcpv6_prot = { | |
2088 | .name = "TCPv6", | |
2089 | .owner = THIS_MODULE, | |
2090 | .close = tcp_close, | |
2091 | .connect = tcp_v6_connect, | |
2092 | .disconnect = tcp_disconnect, | |
463c84b9 | 2093 | .accept = inet_csk_accept, |
1da177e4 LT |
2094 | .ioctl = tcp_ioctl, |
2095 | .init = tcp_v6_init_sock, | |
2096 | .destroy = tcp_v6_destroy_sock, | |
2097 | .shutdown = tcp_shutdown, | |
2098 | .setsockopt = tcp_setsockopt, | |
2099 | .getsockopt = tcp_getsockopt, | |
1da177e4 LT |
2100 | .recvmsg = tcp_recvmsg, |
2101 | .backlog_rcv = tcp_v6_do_rcv, | |
2102 | .hash = tcp_v6_hash, | |
ab1e0a13 ACM |
2103 | .unhash = inet_unhash, |
2104 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2105 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2106 | .sockets_allocated = &tcp_sockets_allocated, | |
2107 | .memory_allocated = &tcp_memory_allocated, | |
2108 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2109 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2110 | .sysctl_mem = sysctl_tcp_mem, |
2111 | .sysctl_wmem = sysctl_tcp_wmem, | |
2112 | .sysctl_rmem = sysctl_tcp_rmem, | |
2113 | .max_header = MAX_TCP_HEADER, | |
2114 | .obj_size = sizeof(struct tcp6_sock), | |
6d6ee43e | 2115 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2116 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2117 | .h.hashinfo = &tcp_hashinfo, |
543d9cfe ACM |
2118 | #ifdef CONFIG_COMPAT |
2119 | .compat_setsockopt = compat_tcp_setsockopt, | |
2120 | .compat_getsockopt = compat_tcp_getsockopt, | |
2121 | #endif | |
1da177e4 LT |
2122 | }; |
2123 | ||
2124 | static struct inet6_protocol tcpv6_protocol = { | |
2125 | .handler = tcp_v6_rcv, | |
2126 | .err_handler = tcp_v6_err, | |
a430a43d | 2127 | .gso_send_check = tcp_v6_gso_send_check, |
adcfc7d0 | 2128 | .gso_segment = tcp_tso_segment, |
1da177e4 LT |
2129 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
2130 | }; | |
2131 | ||
1da177e4 LT |
2132 | static struct inet_protosw tcpv6_protosw = { |
2133 | .type = SOCK_STREAM, | |
2134 | .protocol = IPPROTO_TCP, | |
2135 | .prot = &tcpv6_prot, | |
2136 | .ops = &inet6_stream_ops, | |
2137 | .capability = -1, | |
2138 | .no_check = 0, | |
d83d8461 ACM |
2139 | .flags = INET_PROTOSW_PERMANENT | |
2140 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2141 | }; |
2142 | ||
93ec926b DL |
2143 | static int tcpv6_net_init(struct net *net) |
2144 | { | |
5677242f DL |
2145 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2146 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2147 | } |
2148 | ||
2149 | static void tcpv6_net_exit(struct net *net) | |
2150 | { | |
5677242f | 2151 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
d315492b | 2152 | inet_twsk_purge(net, &tcp_hashinfo, &tcp_death_row, AF_INET6); |
93ec926b DL |
2153 | } |
2154 | ||
2155 | static struct pernet_operations tcpv6_net_ops = { | |
2156 | .init = tcpv6_net_init, | |
2157 | .exit = tcpv6_net_exit, | |
2158 | }; | |
2159 | ||
7f4e4868 | 2160 | int __init tcpv6_init(void) |
1da177e4 | 2161 | { |
7f4e4868 DL |
2162 | int ret; |
2163 | ||
2164 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2165 | if (ret) | |
2166 | goto out; | |
2167 | ||
1da177e4 | 2168 | /* register inet6 protocol */ |
7f4e4868 DL |
2169 | ret = inet6_register_protosw(&tcpv6_protosw); |
2170 | if (ret) | |
2171 | goto out_tcpv6_protocol; | |
2172 | ||
93ec926b | 2173 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2174 | if (ret) |
2175 | goto out_tcpv6_protosw; | |
2176 | out: | |
2177 | return ret; | |
ae0f7d5f | 2178 | |
7f4e4868 DL |
2179 | out_tcpv6_protocol: |
2180 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2181 | out_tcpv6_protosw: | |
2182 | inet6_unregister_protosw(&tcpv6_protosw); | |
2183 | goto out; | |
2184 | } | |
2185 | ||
09f7709f | 2186 | void tcpv6_exit(void) |
7f4e4868 | 2187 | { |
93ec926b | 2188 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2189 | inet6_unregister_protosw(&tcpv6_protosw); |
2190 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2191 | } |