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); |
60236fdd | 72 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req); |
1da177e4 LT |
73 | |
74 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 75 | |
8292a17a ACM |
76 | static struct inet_connection_sock_af_ops ipv6_mapped; |
77 | static struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 78 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
79 | static struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
80 | static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
81 | #else |
82 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
83 | struct in6_addr *addr) | |
84 | { | |
85 | return NULL; | |
86 | } | |
a928630a | 87 | #endif |
1da177e4 | 88 | |
1da177e4 LT |
89 | static void tcp_v6_hash(struct sock *sk) |
90 | { | |
91 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 92 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
93 | tcp_prot.hash(sk); |
94 | return; | |
95 | } | |
96 | local_bh_disable(); | |
ab1e0a13 | 97 | __inet6_hash(sk); |
1da177e4 LT |
98 | local_bh_enable(); |
99 | } | |
100 | } | |
101 | ||
868c86bc | 102 | static __inline__ __sum16 tcp_v6_check(struct tcphdr *th, int len, |
1ab1457c YH |
103 | struct in6_addr *saddr, |
104 | struct in6_addr *daddr, | |
868c86bc | 105 | __wsum base) |
1da177e4 LT |
106 | { |
107 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
108 | } | |
109 | ||
a94f723d | 110 | static __u32 tcp_v6_init_sequence(struct sk_buff *skb) |
1da177e4 | 111 | { |
0660e03f ACM |
112 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
113 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
114 | tcp_hdr(skb)->dest, |
115 | tcp_hdr(skb)->source); | |
1da177e4 LT |
116 | } |
117 | ||
1ab1457c | 118 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
119 | int addr_len) |
120 | { | |
121 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 122 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 123 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
124 | struct ipv6_pinfo *np = inet6_sk(sk); |
125 | struct tcp_sock *tp = tcp_sk(sk); | |
126 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
127 | struct flowi fl; | |
128 | struct dst_entry *dst; | |
129 | int addr_type; | |
130 | int err; | |
131 | ||
1ab1457c | 132 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
133 | return -EINVAL; |
134 | ||
1ab1457c | 135 | if (usin->sin6_family != AF_INET6) |
1da177e4 LT |
136 | return(-EAFNOSUPPORT); |
137 | ||
138 | memset(&fl, 0, sizeof(fl)); | |
139 | ||
140 | if (np->sndflow) { | |
141 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
142 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
143 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
144 | struct ip6_flowlabel *flowlabel; | |
145 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
146 | if (flowlabel == NULL) | |
147 | return -EINVAL; | |
148 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
149 | fl6_sock_release(flowlabel); | |
150 | } | |
151 | } | |
152 | ||
153 | /* | |
1ab1457c YH |
154 | * connect() to INADDR_ANY means loopback (BSD'ism). |
155 | */ | |
156 | ||
157 | if(ipv6_addr_any(&usin->sin6_addr)) | |
158 | usin->sin6_addr.s6_addr[15] = 0x1; | |
1da177e4 LT |
159 | |
160 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
161 | ||
162 | if(addr_type & IPV6_ADDR_MULTICAST) | |
163 | return -ENETUNREACH; | |
164 | ||
165 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
166 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
167 | usin->sin6_scope_id) { | |
168 | /* If interface is set while binding, indices | |
169 | * must coincide. | |
170 | */ | |
171 | if (sk->sk_bound_dev_if && | |
172 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
173 | return -EINVAL; | |
174 | ||
175 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
176 | } | |
177 | ||
178 | /* Connect to link-local address requires an interface */ | |
179 | if (!sk->sk_bound_dev_if) | |
180 | return -EINVAL; | |
181 | } | |
182 | ||
183 | if (tp->rx_opt.ts_recent_stamp && | |
184 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
185 | tp->rx_opt.ts_recent = 0; | |
186 | tp->rx_opt.ts_recent_stamp = 0; | |
187 | tp->write_seq = 0; | |
188 | } | |
189 | ||
190 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
191 | np->flow_label = fl.fl6_flowlabel; | |
192 | ||
193 | /* | |
194 | * TCP over IPv4 | |
195 | */ | |
196 | ||
197 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 198 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
199 | struct sockaddr_in sin; |
200 | ||
201 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
202 | ||
203 | if (__ipv6_only_sock(sk)) | |
204 | return -ENETUNREACH; | |
205 | ||
206 | sin.sin_family = AF_INET; | |
207 | sin.sin_port = usin->sin6_port; | |
208 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
209 | ||
d83d8461 | 210 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 211 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
212 | #ifdef CONFIG_TCP_MD5SIG |
213 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
214 | #endif | |
1da177e4 LT |
215 | |
216 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
217 | ||
218 | if (err) { | |
d83d8461 ACM |
219 | icsk->icsk_ext_hdr_len = exthdrlen; |
220 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 221 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
222 | #ifdef CONFIG_TCP_MD5SIG |
223 | tp->af_specific = &tcp_sock_ipv6_specific; | |
224 | #endif | |
1da177e4 LT |
225 | goto failure; |
226 | } else { | |
227 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
228 | inet->saddr); | |
229 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
230 | inet->rcv_saddr); | |
231 | } | |
232 | ||
233 | return err; | |
234 | } | |
235 | ||
236 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
237 | saddr = &np->rcv_saddr; | |
238 | ||
239 | fl.proto = IPPROTO_TCP; | |
240 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
241 | ipv6_addr_copy(&fl.fl6_src, | |
242 | (saddr ? saddr : &np->saddr)); | |
243 | fl.oif = sk->sk_bound_dev_if; | |
244 | fl.fl_ip_dport = usin->sin6_port; | |
245 | fl.fl_ip_sport = inet->sport; | |
246 | ||
247 | if (np->opt && np->opt->srcrt) { | |
248 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
249 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
250 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
251 | final_p = &final; | |
252 | } | |
253 | ||
beb8d13b VY |
254 | security_sk_classify_flow(sk, &fl); |
255 | ||
1da177e4 LT |
256 | err = ip6_dst_lookup(sk, &dst, &fl); |
257 | if (err) | |
258 | goto failure; | |
259 | if (final_p) | |
260 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
261 | ||
bb72845e | 262 | if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) { |
14e50e57 DM |
263 | if (err == -EREMOTE) |
264 | err = ip6_dst_blackhole(sk, &dst, &fl); | |
265 | if (err < 0) | |
266 | goto failure; | |
267 | } | |
1da177e4 LT |
268 | |
269 | if (saddr == NULL) { | |
270 | saddr = &fl.fl6_src; | |
271 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
272 | } | |
273 | ||
274 | /* set the source address */ | |
275 | ipv6_addr_copy(&np->saddr, saddr); | |
276 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
277 | ||
f83ef8c0 | 278 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 279 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 280 | |
d83d8461 | 281 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 282 | if (np->opt) |
d83d8461 ACM |
283 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
284 | np->opt->opt_nflen); | |
1da177e4 LT |
285 | |
286 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
287 | ||
288 | inet->dport = usin->sin6_port; | |
289 | ||
290 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 291 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
292 | if (err) |
293 | goto late_failure; | |
294 | ||
295 | if (!tp->write_seq) | |
296 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
297 | np->daddr.s6_addr32, | |
298 | inet->sport, | |
299 | inet->dport); | |
300 | ||
301 | err = tcp_connect(sk); | |
302 | if (err) | |
303 | goto late_failure; | |
304 | ||
305 | return 0; | |
306 | ||
307 | late_failure: | |
308 | tcp_set_state(sk, TCP_CLOSE); | |
309 | __sk_dst_reset(sk); | |
310 | failure: | |
311 | inet->dport = 0; | |
312 | sk->sk_route_caps = 0; | |
313 | return err; | |
314 | } | |
315 | ||
316 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
04ce6909 | 317 | int type, int code, int offset, __be32 info) |
1da177e4 LT |
318 | { |
319 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
505cbfc5 | 320 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
321 | struct ipv6_pinfo *np; |
322 | struct sock *sk; | |
323 | int err; | |
1ab1457c | 324 | struct tcp_sock *tp; |
1da177e4 | 325 | __u32 seq; |
ca12a1a4 | 326 | struct net *net = dev_net(skb->dev); |
1da177e4 | 327 | |
ca12a1a4 | 328 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 329 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
330 | |
331 | if (sk == NULL) { | |
332 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
333 | return; | |
334 | } | |
335 | ||
336 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 337 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
338 | return; |
339 | } | |
340 | ||
341 | bh_lock_sock(sk); | |
342 | if (sock_owned_by_user(sk)) | |
de0744af | 343 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
344 | |
345 | if (sk->sk_state == TCP_CLOSE) | |
346 | goto out; | |
347 | ||
348 | tp = tcp_sk(sk); | |
1ab1457c | 349 | seq = ntohl(th->seq); |
1da177e4 LT |
350 | if (sk->sk_state != TCP_LISTEN && |
351 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
de0744af | 352 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
353 | goto out; |
354 | } | |
355 | ||
356 | np = inet6_sk(sk); | |
357 | ||
358 | if (type == ICMPV6_PKT_TOOBIG) { | |
359 | struct dst_entry *dst = NULL; | |
360 | ||
361 | if (sock_owned_by_user(sk)) | |
362 | goto out; | |
363 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
364 | goto out; | |
365 | ||
366 | /* icmp should have updated the destination cache entry */ | |
367 | dst = __sk_dst_check(sk, np->dst_cookie); | |
368 | ||
369 | if (dst == NULL) { | |
370 | struct inet_sock *inet = inet_sk(sk); | |
371 | struct flowi fl; | |
372 | ||
373 | /* BUGGG_FUTURE: Again, it is not clear how | |
374 | to handle rthdr case. Ignore this complexity | |
375 | for now. | |
376 | */ | |
377 | memset(&fl, 0, sizeof(fl)); | |
378 | fl.proto = IPPROTO_TCP; | |
379 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
380 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
381 | fl.oif = sk->sk_bound_dev_if; | |
382 | fl.fl_ip_dport = inet->dport; | |
383 | fl.fl_ip_sport = inet->sport; | |
beb8d13b | 384 | security_skb_classify_flow(skb, &fl); |
1da177e4 LT |
385 | |
386 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
387 | sk->sk_err_soft = -err; | |
388 | goto out; | |
389 | } | |
390 | ||
391 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
392 | sk->sk_err_soft = -err; | |
393 | goto out; | |
394 | } | |
395 | ||
396 | } else | |
397 | dst_hold(dst); | |
398 | ||
d83d8461 | 399 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
1da177e4 LT |
400 | tcp_sync_mss(sk, dst_mtu(dst)); |
401 | tcp_simple_retransmit(sk); | |
402 | } /* else let the usual retransmit timer handle it */ | |
403 | dst_release(dst); | |
404 | goto out; | |
405 | } | |
406 | ||
407 | icmpv6_err_convert(type, code, &err); | |
408 | ||
60236fdd | 409 | /* Might be for an request_sock */ |
1da177e4 | 410 | switch (sk->sk_state) { |
60236fdd | 411 | struct request_sock *req, **prev; |
1da177e4 LT |
412 | case TCP_LISTEN: |
413 | if (sock_owned_by_user(sk)) | |
414 | goto out; | |
415 | ||
8129765a ACM |
416 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
417 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
418 | if (!req) |
419 | goto out; | |
420 | ||
421 | /* ICMPs are not backlogged, hence we cannot get | |
422 | * an established socket here. | |
423 | */ | |
547b792c | 424 | WARN_ON(req->sk != NULL); |
1da177e4 | 425 | |
2e6599cb | 426 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 427 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
428 | goto out; |
429 | } | |
430 | ||
463c84b9 | 431 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
432 | goto out; |
433 | ||
434 | case TCP_SYN_SENT: | |
435 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 436 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 437 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
438 | sk->sk_err = err; |
439 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
440 | ||
441 | tcp_done(sk); | |
442 | } else | |
443 | sk->sk_err_soft = err; | |
444 | goto out; | |
445 | } | |
446 | ||
447 | if (!sock_owned_by_user(sk) && np->recverr) { | |
448 | sk->sk_err = err; | |
449 | sk->sk_error_report(sk); | |
450 | } else | |
451 | sk->sk_err_soft = err; | |
452 | ||
453 | out: | |
454 | bh_unlock_sock(sk); | |
455 | sock_put(sk); | |
456 | } | |
457 | ||
458 | ||
fd80eb94 | 459 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req) |
1da177e4 | 460 | { |
ca304b61 | 461 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
462 | struct ipv6_pinfo *np = inet6_sk(sk); |
463 | struct sk_buff * skb; | |
464 | struct ipv6_txoptions *opt = NULL; | |
465 | struct in6_addr * final_p = NULL, final; | |
466 | struct flowi fl; | |
fd80eb94 | 467 | struct dst_entry *dst; |
1da177e4 LT |
468 | int err = -1; |
469 | ||
470 | memset(&fl, 0, sizeof(fl)); | |
471 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
472 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
473 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 474 | fl.fl6_flowlabel = 0; |
2e6599cb ACM |
475 | fl.oif = treq->iif; |
476 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
1da177e4 | 477 | fl.fl_ip_sport = inet_sk(sk)->sport; |
4237c75c | 478 | security_req_classify_flow(req, &fl); |
1da177e4 | 479 | |
fd80eb94 DL |
480 | opt = np->opt; |
481 | if (opt && opt->srcrt) { | |
482 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
483 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
484 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
485 | final_p = &final; | |
1da177e4 LT |
486 | } |
487 | ||
fd80eb94 DL |
488 | err = ip6_dst_lookup(sk, &dst, &fl); |
489 | if (err) | |
490 | goto done; | |
491 | if (final_p) | |
492 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
493 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
494 | goto done; | |
495 | ||
1da177e4 LT |
496 | skb = tcp_make_synack(sk, dst, req); |
497 | if (skb) { | |
aa8223c7 | 498 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
499 | |
500 | th->check = tcp_v6_check(th, skb->len, | |
2e6599cb | 501 | &treq->loc_addr, &treq->rmt_addr, |
1da177e4 LT |
502 | csum_partial((char *)th, skb->len, skb->csum)); |
503 | ||
2e6599cb | 504 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 | 505 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
b9df3cb8 | 506 | err = net_xmit_eval(err); |
1da177e4 LT |
507 | } |
508 | ||
509 | done: | |
1ab1457c | 510 | if (opt && opt != np->opt) |
1da177e4 | 511 | sock_kfree_s(sk, opt, opt->tot_len); |
78b91042 | 512 | dst_release(dst); |
1da177e4 LT |
513 | return err; |
514 | } | |
515 | ||
c6aefafb GG |
516 | static inline void syn_flood_warning(struct sk_buff *skb) |
517 | { | |
518 | #ifdef CONFIG_SYN_COOKIES | |
519 | if (sysctl_tcp_syncookies) | |
520 | printk(KERN_INFO | |
521 | "TCPv6: Possible SYN flooding on port %d. " | |
522 | "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest)); | |
523 | else | |
524 | #endif | |
525 | printk(KERN_INFO | |
526 | "TCPv6: Possible SYN flooding on port %d. " | |
527 | "Dropping request.\n", ntohs(tcp_hdr(skb)->dest)); | |
528 | } | |
529 | ||
60236fdd | 530 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 531 | { |
ca304b61 ACM |
532 | if (inet6_rsk(req)->pktopts) |
533 | kfree_skb(inet6_rsk(req)->pktopts); | |
1da177e4 LT |
534 | } |
535 | ||
cfb6eeb4 YH |
536 | #ifdef CONFIG_TCP_MD5SIG |
537 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
538 | struct in6_addr *addr) | |
539 | { | |
540 | struct tcp_sock *tp = tcp_sk(sk); | |
541 | int i; | |
542 | ||
543 | BUG_ON(tp == NULL); | |
544 | ||
545 | if (!tp->md5sig_info || !tp->md5sig_info->entries6) | |
546 | return NULL; | |
547 | ||
548 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 549 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr)) |
f8ab18d2 | 550 | return &tp->md5sig_info->keys6[i].base; |
cfb6eeb4 YH |
551 | } |
552 | return NULL; | |
553 | } | |
554 | ||
555 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
556 | struct sock *addr_sk) | |
557 | { | |
558 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); | |
559 | } | |
560 | ||
561 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
562 | struct request_sock *req) | |
563 | { | |
564 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
565 | } | |
566 | ||
567 | static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer, | |
568 | char *newkey, u8 newkeylen) | |
569 | { | |
570 | /* Add key to the list */ | |
b0a713e9 | 571 | struct tcp_md5sig_key *key; |
cfb6eeb4 YH |
572 | struct tcp_sock *tp = tcp_sk(sk); |
573 | struct tcp6_md5sig_key *keys; | |
574 | ||
b0a713e9 | 575 | key = tcp_v6_md5_do_lookup(sk, peer); |
cfb6eeb4 YH |
576 | if (key) { |
577 | /* modify existing entry - just update that one */ | |
b0a713e9 MD |
578 | kfree(key->key); |
579 | key->key = newkey; | |
580 | key->keylen = newkeylen; | |
cfb6eeb4 YH |
581 | } else { |
582 | /* reallocate new list if current one is full. */ | |
583 | if (!tp->md5sig_info) { | |
584 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC); | |
585 | if (!tp->md5sig_info) { | |
586 | kfree(newkey); | |
587 | return -ENOMEM; | |
588 | } | |
3d7dbeac | 589 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 | 590 | } |
aacbe8c8 YH |
591 | if (tcp_alloc_md5sig_pool() == NULL) { |
592 | kfree(newkey); | |
593 | return -ENOMEM; | |
594 | } | |
cfb6eeb4 YH |
595 | if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) { |
596 | keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) * | |
597 | (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC); | |
598 | ||
599 | if (!keys) { | |
600 | tcp_free_md5sig_pool(); | |
601 | kfree(newkey); | |
602 | return -ENOMEM; | |
603 | } | |
604 | ||
605 | if (tp->md5sig_info->entries6) | |
606 | memmove(keys, tp->md5sig_info->keys6, | |
607 | (sizeof (tp->md5sig_info->keys6[0]) * | |
608 | tp->md5sig_info->entries6)); | |
609 | ||
610 | kfree(tp->md5sig_info->keys6); | |
611 | tp->md5sig_info->keys6 = keys; | |
612 | tp->md5sig_info->alloced6++; | |
613 | } | |
614 | ||
615 | ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr, | |
616 | peer); | |
f8ab18d2 DM |
617 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey; |
618 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen; | |
cfb6eeb4 YH |
619 | |
620 | tp->md5sig_info->entries6++; | |
621 | } | |
622 | return 0; | |
623 | } | |
624 | ||
625 | static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk, | |
626 | u8 *newkey, __u8 newkeylen) | |
627 | { | |
628 | return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr, | |
629 | newkey, newkeylen); | |
630 | } | |
631 | ||
632 | static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer) | |
633 | { | |
634 | struct tcp_sock *tp = tcp_sk(sk); | |
635 | int i; | |
636 | ||
637 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 638 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) { |
cfb6eeb4 | 639 | /* Free the key */ |
f8ab18d2 | 640 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
641 | tp->md5sig_info->entries6--; |
642 | ||
643 | if (tp->md5sig_info->entries6 == 0) { | |
644 | kfree(tp->md5sig_info->keys6); | |
645 | tp->md5sig_info->keys6 = NULL; | |
ca983cef | 646 | tp->md5sig_info->alloced6 = 0; |
cfb6eeb4 YH |
647 | } else { |
648 | /* shrink the database */ | |
649 | if (tp->md5sig_info->entries6 != i) | |
650 | memmove(&tp->md5sig_info->keys6[i], | |
651 | &tp->md5sig_info->keys6[i+1], | |
652 | (tp->md5sig_info->entries6 - i) | |
653 | * sizeof (tp->md5sig_info->keys6[0])); | |
654 | } | |
77adefdc YH |
655 | tcp_free_md5sig_pool(); |
656 | return 0; | |
cfb6eeb4 YH |
657 | } |
658 | } | |
659 | return -ENOENT; | |
660 | } | |
661 | ||
662 | static void tcp_v6_clear_md5_list (struct sock *sk) | |
663 | { | |
664 | struct tcp_sock *tp = tcp_sk(sk); | |
665 | int i; | |
666 | ||
667 | if (tp->md5sig_info->entries6) { | |
668 | for (i = 0; i < tp->md5sig_info->entries6; i++) | |
f8ab18d2 | 669 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
670 | tp->md5sig_info->entries6 = 0; |
671 | tcp_free_md5sig_pool(); | |
672 | } | |
673 | ||
674 | kfree(tp->md5sig_info->keys6); | |
675 | tp->md5sig_info->keys6 = NULL; | |
676 | tp->md5sig_info->alloced6 = 0; | |
677 | ||
678 | if (tp->md5sig_info->entries4) { | |
679 | for (i = 0; i < tp->md5sig_info->entries4; i++) | |
f8ab18d2 | 680 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
681 | tp->md5sig_info->entries4 = 0; |
682 | tcp_free_md5sig_pool(); | |
683 | } | |
684 | ||
685 | kfree(tp->md5sig_info->keys4); | |
686 | tp->md5sig_info->keys4 = NULL; | |
687 | tp->md5sig_info->alloced4 = 0; | |
688 | } | |
689 | ||
690 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, | |
691 | int optlen) | |
692 | { | |
693 | struct tcp_md5sig cmd; | |
694 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
695 | u8 *newkey; | |
696 | ||
697 | if (optlen < sizeof(cmd)) | |
698 | return -EINVAL; | |
699 | ||
700 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
701 | return -EFAULT; | |
702 | ||
703 | if (sin6->sin6_family != AF_INET6) | |
704 | return -EINVAL; | |
705 | ||
706 | if (!cmd.tcpm_keylen) { | |
707 | if (!tcp_sk(sk)->md5sig_info) | |
708 | return -ENOENT; | |
e773e4fa | 709 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
cfb6eeb4 YH |
710 | return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]); |
711 | return tcp_v6_md5_do_del(sk, &sin6->sin6_addr); | |
712 | } | |
713 | ||
714 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
715 | return -EINVAL; | |
716 | ||
717 | if (!tcp_sk(sk)->md5sig_info) { | |
718 | struct tcp_sock *tp = tcp_sk(sk); | |
719 | struct tcp_md5sig_info *p; | |
720 | ||
721 | p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL); | |
722 | if (!p) | |
723 | return -ENOMEM; | |
724 | ||
725 | tp->md5sig_info = p; | |
3d7dbeac | 726 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 YH |
727 | } |
728 | ||
af879cc7 | 729 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
730 | if (!newkey) |
731 | return -ENOMEM; | |
e773e4fa | 732 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { |
cfb6eeb4 YH |
733 | return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3], |
734 | newkey, cmd.tcpm_keylen); | |
735 | } | |
736 | return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen); | |
737 | } | |
738 | ||
49a72dfb AL |
739 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
740 | struct in6_addr *daddr, | |
741 | struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 742 | { |
cfb6eeb4 | 743 | struct tcp6_pseudohdr *bp; |
49a72dfb | 744 | struct scatterlist sg; |
8d26d76d | 745 | |
cfb6eeb4 | 746 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 YH |
747 | /* 1. TCP pseudo-header (RFC2460) */ |
748 | ipv6_addr_copy(&bp->saddr, saddr); | |
749 | ipv6_addr_copy(&bp->daddr, daddr); | |
49a72dfb AL |
750 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
751 | bp->len = cpu_to_be16(nbytes); | |
cfb6eeb4 | 752 | |
49a72dfb AL |
753 | sg_init_one(&sg, bp, sizeof(*bp)); |
754 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
755 | } | |
c7da57a1 | 756 | |
49a72dfb AL |
757 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
758 | struct in6_addr *daddr, struct in6_addr *saddr, | |
759 | struct tcphdr *th) | |
760 | { | |
761 | struct tcp_md5sig_pool *hp; | |
762 | struct hash_desc *desc; | |
763 | ||
764 | hp = tcp_get_md5sig_pool(); | |
765 | if (!hp) | |
766 | goto clear_hash_noput; | |
767 | desc = &hp->md5_desc; | |
768 | ||
769 | if (crypto_hash_init(desc)) | |
770 | goto clear_hash; | |
771 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
772 | goto clear_hash; | |
773 | if (tcp_md5_hash_header(hp, th)) | |
774 | goto clear_hash; | |
775 | if (tcp_md5_hash_key(hp, key)) | |
776 | goto clear_hash; | |
777 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 778 | goto clear_hash; |
cfb6eeb4 | 779 | |
cfb6eeb4 | 780 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 781 | return 0; |
49a72dfb | 782 | |
cfb6eeb4 YH |
783 | clear_hash: |
784 | tcp_put_md5sig_pool(); | |
785 | clear_hash_noput: | |
786 | memset(md5_hash, 0, 16); | |
49a72dfb | 787 | return 1; |
cfb6eeb4 YH |
788 | } |
789 | ||
49a72dfb AL |
790 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
791 | struct sock *sk, struct request_sock *req, | |
792 | struct sk_buff *skb) | |
cfb6eeb4 YH |
793 | { |
794 | struct in6_addr *saddr, *daddr; | |
49a72dfb AL |
795 | struct tcp_md5sig_pool *hp; |
796 | struct hash_desc *desc; | |
797 | struct tcphdr *th = tcp_hdr(skb); | |
cfb6eeb4 YH |
798 | |
799 | if (sk) { | |
800 | saddr = &inet6_sk(sk)->saddr; | |
801 | daddr = &inet6_sk(sk)->daddr; | |
49a72dfb | 802 | } else if (req) { |
cfb6eeb4 YH |
803 | saddr = &inet6_rsk(req)->loc_addr; |
804 | daddr = &inet6_rsk(req)->rmt_addr; | |
49a72dfb AL |
805 | } else { |
806 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
807 | saddr = &ip6h->saddr; | |
808 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 809 | } |
49a72dfb AL |
810 | |
811 | hp = tcp_get_md5sig_pool(); | |
812 | if (!hp) | |
813 | goto clear_hash_noput; | |
814 | desc = &hp->md5_desc; | |
815 | ||
816 | if (crypto_hash_init(desc)) | |
817 | goto clear_hash; | |
818 | ||
819 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
820 | goto clear_hash; | |
821 | if (tcp_md5_hash_header(hp, th)) | |
822 | goto clear_hash; | |
823 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
824 | goto clear_hash; | |
825 | if (tcp_md5_hash_key(hp, key)) | |
826 | goto clear_hash; | |
827 | if (crypto_hash_final(desc, md5_hash)) | |
828 | goto clear_hash; | |
829 | ||
830 | tcp_put_md5sig_pool(); | |
831 | return 0; | |
832 | ||
833 | clear_hash: | |
834 | tcp_put_md5sig_pool(); | |
835 | clear_hash_noput: | |
836 | memset(md5_hash, 0, 16); | |
837 | return 1; | |
cfb6eeb4 YH |
838 | } |
839 | ||
840 | static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb) | |
841 | { | |
842 | __u8 *hash_location = NULL; | |
843 | struct tcp_md5sig_key *hash_expected; | |
0660e03f | 844 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
aa8223c7 | 845 | struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 846 | int genhash; |
cfb6eeb4 YH |
847 | u8 newhash[16]; |
848 | ||
849 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 850 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 851 | |
cfb6eeb4 YH |
852 | /* do we have a hash as expected? */ |
853 | if (!hash_expected) { | |
854 | if (!hash_location) | |
855 | return 0; | |
856 | if (net_ratelimit()) { | |
857 | printk(KERN_INFO "MD5 Hash NOT expected but found " | |
858 | "(" NIP6_FMT ", %u)->" | |
859 | "(" NIP6_FMT ", %u)\n", | |
860 | NIP6(ip6h->saddr), ntohs(th->source), | |
861 | NIP6(ip6h->daddr), ntohs(th->dest)); | |
862 | } | |
863 | return 1; | |
864 | } | |
865 | ||
866 | if (!hash_location) { | |
867 | if (net_ratelimit()) { | |
868 | printk(KERN_INFO "MD5 Hash expected but NOT found " | |
869 | "(" NIP6_FMT ", %u)->" | |
870 | "(" NIP6_FMT ", %u)\n", | |
871 | NIP6(ip6h->saddr), ntohs(th->source), | |
872 | NIP6(ip6h->daddr), ntohs(th->dest)); | |
873 | } | |
874 | return 1; | |
875 | } | |
876 | ||
877 | /* check the signature */ | |
49a72dfb AL |
878 | genhash = tcp_v6_md5_hash_skb(newhash, |
879 | hash_expected, | |
880 | NULL, NULL, skb); | |
881 | ||
cfb6eeb4 YH |
882 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
883 | if (net_ratelimit()) { | |
884 | printk(KERN_INFO "MD5 Hash %s for " | |
885 | "(" NIP6_FMT ", %u)->" | |
886 | "(" NIP6_FMT ", %u)\n", | |
887 | genhash ? "failed" : "mismatch", | |
888 | NIP6(ip6h->saddr), ntohs(th->source), | |
889 | NIP6(ip6h->daddr), ntohs(th->dest)); | |
890 | } | |
891 | return 1; | |
892 | } | |
893 | return 0; | |
894 | } | |
895 | #endif | |
896 | ||
c6aefafb | 897 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 898 | .family = AF_INET6, |
2e6599cb | 899 | .obj_size = sizeof(struct tcp6_request_sock), |
1da177e4 | 900 | .rtx_syn_ack = tcp_v6_send_synack, |
60236fdd ACM |
901 | .send_ack = tcp_v6_reqsk_send_ack, |
902 | .destructor = tcp_v6_reqsk_destructor, | |
1da177e4 LT |
903 | .send_reset = tcp_v6_send_reset |
904 | }; | |
905 | ||
cfb6eeb4 | 906 | #ifdef CONFIG_TCP_MD5SIG |
b6332e6c | 907 | static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 908 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
cfb6eeb4 | 909 | }; |
b6332e6c | 910 | #endif |
cfb6eeb4 | 911 | |
6d6ee43e ACM |
912 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
913 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
914 | .twsk_unique = tcp_twsk_unique, | |
cfb6eeb4 | 915 | .twsk_destructor= tcp_twsk_destructor, |
6d6ee43e ACM |
916 | }; |
917 | ||
8292a17a | 918 | static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) |
1da177e4 LT |
919 | { |
920 | struct ipv6_pinfo *np = inet6_sk(sk); | |
aa8223c7 | 921 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 922 | |
84fa7933 | 923 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1da177e4 | 924 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); |
663ead3b | 925 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 926 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 927 | } else { |
1ab1457c YH |
928 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, |
929 | csum_partial((char *)th, th->doff<<2, | |
1da177e4 LT |
930 | skb->csum)); |
931 | } | |
932 | } | |
933 | ||
a430a43d HX |
934 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
935 | { | |
936 | struct ipv6hdr *ipv6h; | |
937 | struct tcphdr *th; | |
938 | ||
939 | if (!pskb_may_pull(skb, sizeof(*th))) | |
940 | return -EINVAL; | |
941 | ||
0660e03f | 942 | ipv6h = ipv6_hdr(skb); |
aa8223c7 | 943 | th = tcp_hdr(skb); |
a430a43d HX |
944 | |
945 | th->check = 0; | |
946 | th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, | |
947 | IPPROTO_TCP, 0); | |
663ead3b | 948 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 949 | skb->csum_offset = offsetof(struct tcphdr, check); |
84fa7933 | 950 | skb->ip_summed = CHECKSUM_PARTIAL; |
a430a43d HX |
951 | return 0; |
952 | } | |
1da177e4 | 953 | |
cfb6eeb4 | 954 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 955 | { |
aa8223c7 | 956 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
957 | struct sk_buff *buff; |
958 | struct flowi fl; | |
c346dca1 | 959 | struct net *net = dev_net(skb->dst->dev); |
e5047992 | 960 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
9cb5734e | 961 | unsigned int tot_len = sizeof(*th); |
cfb6eeb4 YH |
962 | #ifdef CONFIG_TCP_MD5SIG |
963 | struct tcp_md5sig_key *key; | |
964 | #endif | |
1da177e4 LT |
965 | |
966 | if (th->rst) | |
967 | return; | |
968 | ||
969 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 970 | return; |
1da177e4 | 971 | |
cfb6eeb4 YH |
972 | #ifdef CONFIG_TCP_MD5SIG |
973 | if (sk) | |
0660e03f | 974 | key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr); |
cfb6eeb4 YH |
975 | else |
976 | key = NULL; | |
977 | ||
978 | if (key) | |
979 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
980 | #endif | |
981 | ||
1da177e4 LT |
982 | /* |
983 | * We need to grab some memory, and put together an RST, | |
984 | * and then put it into the queue to be sent. | |
985 | */ | |
986 | ||
cfb6eeb4 | 987 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 988 | GFP_ATOMIC); |
1ab1457c YH |
989 | if (buff == NULL) |
990 | return; | |
1da177e4 | 991 | |
cfb6eeb4 | 992 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 993 | |
cfb6eeb4 | 994 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
1da177e4 LT |
995 | |
996 | /* Swap the send and the receive. */ | |
997 | memset(t1, 0, sizeof(*t1)); | |
998 | t1->dest = th->source; | |
999 | t1->source = th->dest; | |
cfb6eeb4 | 1000 | t1->doff = tot_len / 4; |
1da177e4 | 1001 | t1->rst = 1; |
1ab1457c | 1002 | |
1da177e4 | 1003 | if(th->ack) { |
1ab1457c | 1004 | t1->seq = th->ack_seq; |
1da177e4 LT |
1005 | } else { |
1006 | t1->ack = 1; | |
1007 | t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin | |
1008 | + skb->len - (th->doff<<2)); | |
1009 | } | |
1010 | ||
cfb6eeb4 YH |
1011 | #ifdef CONFIG_TCP_MD5SIG |
1012 | if (key) { | |
8e5200f5 | 1013 | __be32 *opt = (__be32*)(t1 + 1); |
cfb6eeb4 YH |
1014 | opt[0] = htonl((TCPOPT_NOP << 24) | |
1015 | (TCPOPT_NOP << 16) | | |
1016 | (TCPOPT_MD5SIG << 8) | | |
1017 | TCPOLEN_MD5SIG); | |
49a72dfb AL |
1018 | tcp_v6_md5_hash_hdr((__u8 *)&opt[1], key, |
1019 | &ipv6_hdr(skb)->daddr, | |
1020 | &ipv6_hdr(skb)->saddr, t1); | |
cfb6eeb4 YH |
1021 | } |
1022 | #endif | |
1023 | ||
1da177e4 LT |
1024 | buff->csum = csum_partial((char *)t1, sizeof(*t1), 0); |
1025 | ||
1026 | memset(&fl, 0, sizeof(fl)); | |
0660e03f ACM |
1027 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
1028 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1029 | |
1030 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
1031 | sizeof(*t1), IPPROTO_TCP, | |
1032 | buff->csum); | |
1033 | ||
1034 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 1035 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
1036 | fl.fl_ip_dport = t1->dest; |
1037 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 1038 | security_skb_classify_flow(skb, &fl); |
1da177e4 | 1039 | |
c20121ae DL |
1040 | /* Pass a socket to ip6_dst_lookup either it is for RST |
1041 | * Underlying function will use this to retrieve the network | |
1042 | * namespace | |
1043 | */ | |
e5047992 | 1044 | if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) { |
1da177e4 | 1045 | |
ecc51b6d | 1046 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
e5047992 | 1047 | ip6_xmit(ctl_sk, buff, &fl, NULL, 0); |
63231bdd PE |
1048 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
1049 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
1da177e4 | 1050 | return; |
ecc51b6d | 1051 | } |
1da177e4 LT |
1052 | } |
1053 | ||
1054 | kfree_skb(buff); | |
1055 | } | |
1056 | ||
9501f972 YH |
1057 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts, |
1058 | struct tcp_md5sig_key *key) | |
1da177e4 | 1059 | { |
aa8223c7 | 1060 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
1061 | struct sk_buff *buff; |
1062 | struct flowi fl; | |
c346dca1 | 1063 | struct net *net = dev_net(skb->dev); |
e5047992 | 1064 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
9cb5734e | 1065 | unsigned int tot_len = sizeof(struct tcphdr); |
e69a4adc | 1066 | __be32 *topt; |
1da177e4 LT |
1067 | |
1068 | if (ts) | |
4244f8a9 | 1069 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 YH |
1070 | #ifdef CONFIG_TCP_MD5SIG |
1071 | if (key) | |
1072 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
1073 | #endif | |
1da177e4 LT |
1074 | |
1075 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, | |
1076 | GFP_ATOMIC); | |
1077 | if (buff == NULL) | |
1078 | return; | |
1079 | ||
1080 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); | |
1081 | ||
1082 | t1 = (struct tcphdr *) skb_push(buff,tot_len); | |
1083 | ||
1084 | /* Swap the send and the receive. */ | |
1085 | memset(t1, 0, sizeof(*t1)); | |
1086 | t1->dest = th->source; | |
1087 | t1->source = th->dest; | |
1088 | t1->doff = tot_len/4; | |
1089 | t1->seq = htonl(seq); | |
1090 | t1->ack_seq = htonl(ack); | |
1091 | t1->ack = 1; | |
1092 | t1->window = htons(win); | |
cfb6eeb4 | 1093 | |
e69a4adc | 1094 | topt = (__be32 *)(t1 + 1); |
1ab1457c | 1095 | |
1da177e4 | 1096 | if (ts) { |
cfb6eeb4 YH |
1097 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
1098 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
1099 | *topt++ = htonl(tcp_time_stamp); | |
1100 | *topt = htonl(ts); | |
1da177e4 LT |
1101 | } |
1102 | ||
cfb6eeb4 YH |
1103 | #ifdef CONFIG_TCP_MD5SIG |
1104 | if (key) { | |
1105 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
1106 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
49a72dfb AL |
1107 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, |
1108 | &ipv6_hdr(skb)->daddr, | |
1109 | &ipv6_hdr(skb)->saddr, t1); | |
cfb6eeb4 YH |
1110 | } |
1111 | #endif | |
1112 | ||
1da177e4 LT |
1113 | buff->csum = csum_partial((char *)t1, tot_len, 0); |
1114 | ||
1115 | memset(&fl, 0, sizeof(fl)); | |
0660e03f ACM |
1116 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
1117 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1118 | |
1119 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
1120 | tot_len, IPPROTO_TCP, | |
1121 | buff->csum); | |
1122 | ||
1123 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 1124 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
1125 | fl.fl_ip_dport = t1->dest; |
1126 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 1127 | security_skb_classify_flow(skb, &fl); |
1da177e4 | 1128 | |
e5047992 | 1129 | if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) { |
ecc51b6d | 1130 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
e5047992 | 1131 | ip6_xmit(ctl_sk, buff, &fl, NULL, 0); |
63231bdd | 1132 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
1da177e4 | 1133 | return; |
ecc51b6d | 1134 | } |
1da177e4 LT |
1135 | } |
1136 | ||
1137 | kfree_skb(buff); | |
1138 | } | |
1139 | ||
1140 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1141 | { | |
8feaf0c0 | 1142 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 1143 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 1144 | |
9501f972 | 1145 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 1146 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
9501f972 | 1147 | tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw)); |
1da177e4 | 1148 | |
8feaf0c0 | 1149 | inet_twsk_put(tw); |
1da177e4 LT |
1150 | } |
1151 | ||
60236fdd | 1152 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req) |
1da177e4 | 1153 | { |
9501f972 YH |
1154 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent, |
1155 | tcp_v6_md5_do_lookup(skb->sk, &ipv6_hdr(skb)->daddr)); | |
1da177e4 LT |
1156 | } |
1157 | ||
1158 | ||
1159 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
1160 | { | |
60236fdd | 1161 | struct request_sock *req, **prev; |
aa8223c7 | 1162 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
1163 | struct sock *nsk; |
1164 | ||
1165 | /* Find possible connection requests. */ | |
8129765a | 1166 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
1167 | &ipv6_hdr(skb)->saddr, |
1168 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 LT |
1169 | if (req) |
1170 | return tcp_check_req(sk, skb, req, prev); | |
1171 | ||
3b1e0a65 | 1172 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
1173 | &ipv6_hdr(skb)->saddr, th->source, |
1174 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
1175 | |
1176 | if (nsk) { | |
1177 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1178 | bh_lock_sock(nsk); | |
1179 | return nsk; | |
1180 | } | |
9469c7b4 | 1181 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1182 | return NULL; |
1183 | } | |
1184 | ||
c6aefafb | 1185 | #ifdef CONFIG_SYN_COOKIES |
1da177e4 | 1186 | if (!th->rst && !th->syn && th->ack) |
c6aefafb | 1187 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1188 | #endif |
1189 | return sk; | |
1190 | } | |
1191 | ||
1da177e4 LT |
1192 | /* FIXME: this is substantially similar to the ipv4 code. |
1193 | * Can some kind of merge be done? -- erics | |
1194 | */ | |
1195 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1196 | { | |
ca304b61 | 1197 | struct inet6_request_sock *treq; |
1da177e4 LT |
1198 | struct ipv6_pinfo *np = inet6_sk(sk); |
1199 | struct tcp_options_received tmp_opt; | |
1200 | struct tcp_sock *tp = tcp_sk(sk); | |
60236fdd | 1201 | struct request_sock *req = NULL; |
1da177e4 | 1202 | __u32 isn = TCP_SKB_CB(skb)->when; |
c6aefafb GG |
1203 | #ifdef CONFIG_SYN_COOKIES |
1204 | int want_cookie = 0; | |
1205 | #else | |
1206 | #define want_cookie 0 | |
1207 | #endif | |
1da177e4 LT |
1208 | |
1209 | if (skb->protocol == htons(ETH_P_IP)) | |
1210 | return tcp_v4_conn_request(sk, skb); | |
1211 | ||
1212 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1213 | goto drop; |
1da177e4 | 1214 | |
463c84b9 | 1215 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 | 1216 | if (net_ratelimit()) |
c6aefafb GG |
1217 | syn_flood_warning(skb); |
1218 | #ifdef CONFIG_SYN_COOKIES | |
1219 | if (sysctl_tcp_syncookies) | |
1220 | want_cookie = 1; | |
1221 | else | |
1222 | #endif | |
1ab1457c | 1223 | goto drop; |
1da177e4 LT |
1224 | } |
1225 | ||
463c84b9 | 1226 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1227 | goto drop; |
1228 | ||
ca304b61 | 1229 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1230 | if (req == NULL) |
1231 | goto drop; | |
1232 | ||
cfb6eeb4 YH |
1233 | #ifdef CONFIG_TCP_MD5SIG |
1234 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
1235 | #endif | |
1236 | ||
1da177e4 LT |
1237 | tcp_clear_options(&tmp_opt); |
1238 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1239 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
1240 | ||
1241 | tcp_parse_options(skb, &tmp_opt, 0); | |
1242 | ||
4dfc2817 | 1243 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 1244 | tcp_clear_options(&tmp_opt); |
c6aefafb | 1245 | |
1da177e4 LT |
1246 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1247 | tcp_openreq_init(req, &tmp_opt, skb); | |
1248 | ||
ca304b61 | 1249 | treq = inet6_rsk(req); |
0660e03f ACM |
1250 | ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr); |
1251 | ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr); | |
c6aefafb GG |
1252 | if (!want_cookie) |
1253 | TCP_ECN_create_request(req, tcp_hdr(skb)); | |
1254 | ||
1255 | if (want_cookie) { | |
1256 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); | |
4dfc2817 | 1257 | req->cookie_ts = tmp_opt.tstamp_ok; |
c6aefafb GG |
1258 | } else if (!isn) { |
1259 | if (ipv6_opt_accepted(sk, skb) || | |
1260 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1261 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1262 | atomic_inc(&skb->users); | |
1263 | treq->pktopts = skb; | |
1264 | } | |
1265 | treq->iif = sk->sk_bound_dev_if; | |
1da177e4 | 1266 | |
c6aefafb GG |
1267 | /* So that link locals have meaning */ |
1268 | if (!sk->sk_bound_dev_if && | |
1269 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1270 | treq->iif = inet6_iif(skb); | |
1da177e4 | 1271 | |
a94f723d | 1272 | isn = tcp_v6_init_sequence(skb); |
c6aefafb | 1273 | } |
1da177e4 | 1274 | |
2e6599cb | 1275 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1276 | |
4237c75c VY |
1277 | security_inet_conn_request(sk, skb, req); |
1278 | ||
fd80eb94 | 1279 | if (tcp_v6_send_synack(sk, req)) |
1da177e4 LT |
1280 | goto drop; |
1281 | ||
c6aefafb GG |
1282 | if (!want_cookie) { |
1283 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); | |
1284 | return 0; | |
1285 | } | |
1da177e4 LT |
1286 | |
1287 | drop: | |
1288 | if (req) | |
60236fdd | 1289 | reqsk_free(req); |
1da177e4 | 1290 | |
1da177e4 LT |
1291 | return 0; /* don't send reset */ |
1292 | } | |
1293 | ||
1294 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1295 | struct request_sock *req, |
1da177e4 LT |
1296 | struct dst_entry *dst) |
1297 | { | |
ca304b61 | 1298 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
1299 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1300 | struct tcp6_sock *newtcp6sk; | |
1301 | struct inet_sock *newinet; | |
1302 | struct tcp_sock *newtp; | |
1303 | struct sock *newsk; | |
1304 | struct ipv6_txoptions *opt; | |
cfb6eeb4 YH |
1305 | #ifdef CONFIG_TCP_MD5SIG |
1306 | struct tcp_md5sig_key *key; | |
1307 | #endif | |
1da177e4 LT |
1308 | |
1309 | if (skb->protocol == htons(ETH_P_IP)) { | |
1310 | /* | |
1311 | * v6 mapped | |
1312 | */ | |
1313 | ||
1314 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1315 | ||
1ab1457c | 1316 | if (newsk == NULL) |
1da177e4 LT |
1317 | return NULL; |
1318 | ||
1319 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1320 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1321 | ||
1322 | newinet = inet_sk(newsk); | |
1323 | newnp = inet6_sk(newsk); | |
1324 | newtp = tcp_sk(newsk); | |
1325 | ||
1326 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1327 | ||
1328 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
1329 | newinet->daddr); | |
1330 | ||
1331 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
1332 | newinet->saddr); | |
1333 | ||
1334 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1335 | ||
8292a17a | 1336 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1337 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1338 | #ifdef CONFIG_TCP_MD5SIG |
1339 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1340 | #endif | |
1341 | ||
1da177e4 LT |
1342 | newnp->pktoptions = NULL; |
1343 | newnp->opt = NULL; | |
505cbfc5 | 1344 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1345 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 | 1346 | |
e6848976 ACM |
1347 | /* |
1348 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1349 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1350 | * that function for the gory details. -acme | |
1da177e4 | 1351 | */ |
1da177e4 LT |
1352 | |
1353 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1354 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1355 | Sync it now. |
1356 | */ | |
d83d8461 | 1357 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1358 | |
1359 | return newsk; | |
1360 | } | |
1361 | ||
1362 | opt = np->opt; | |
1363 | ||
1364 | if (sk_acceptq_is_full(sk)) | |
1365 | goto out_overflow; | |
1366 | ||
1da177e4 LT |
1367 | if (dst == NULL) { |
1368 | struct in6_addr *final_p = NULL, final; | |
1369 | struct flowi fl; | |
1370 | ||
1371 | memset(&fl, 0, sizeof(fl)); | |
1372 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1373 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
1374 | if (opt && opt->srcrt) { |
1375 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1376 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1377 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1378 | final_p = &final; | |
1379 | } | |
2e6599cb | 1380 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1381 | fl.oif = sk->sk_bound_dev_if; |
2e6599cb | 1382 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
1da177e4 | 1383 | fl.fl_ip_sport = inet_sk(sk)->sport; |
4237c75c | 1384 | security_req_classify_flow(req, &fl); |
1da177e4 LT |
1385 | |
1386 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1387 | goto out; | |
1388 | ||
1389 | if (final_p) | |
1390 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1391 | ||
1392 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
1393 | goto out; | |
1ab1457c | 1394 | } |
1da177e4 LT |
1395 | |
1396 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1397 | if (newsk == NULL) | |
1398 | goto out; | |
1399 | ||
e6848976 ACM |
1400 | /* |
1401 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1402 | * count here, tcp_create_openreq_child now does this for us, see the | |
1403 | * comment in that function for the gory details. -acme | |
1404 | */ | |
1da177e4 | 1405 | |
59eed279 | 1406 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1407 | __ip6_dst_store(newsk, dst, NULL, NULL); |
1da177e4 LT |
1408 | |
1409 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1410 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1411 | ||
1412 | newtp = tcp_sk(newsk); | |
1413 | newinet = inet_sk(newsk); | |
1414 | newnp = inet6_sk(newsk); | |
1415 | ||
1416 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1417 | ||
2e6599cb ACM |
1418 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1419 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1420 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1421 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 | 1422 | |
1ab1457c | 1423 | /* Now IPv6 options... |
1da177e4 LT |
1424 | |
1425 | First: no IPv4 options. | |
1426 | */ | |
1427 | newinet->opt = NULL; | |
d35690be | 1428 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1429 | |
1430 | /* Clone RX bits */ | |
1431 | newnp->rxopt.all = np->rxopt.all; | |
1432 | ||
1433 | /* Clone pktoptions received with SYN */ | |
1434 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1435 | if (treq->pktopts != NULL) { |
1436 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1437 | kfree_skb(treq->pktopts); | |
1438 | treq->pktopts = NULL; | |
1da177e4 LT |
1439 | if (newnp->pktoptions) |
1440 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1441 | } | |
1442 | newnp->opt = NULL; | |
505cbfc5 | 1443 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1444 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
1445 | |
1446 | /* Clone native IPv6 options from listening socket (if any) | |
1447 | ||
1448 | Yes, keeping reference count would be much more clever, | |
1449 | but we make one more one thing there: reattach optmem | |
1450 | to newsk. | |
1451 | */ | |
1452 | if (opt) { | |
1453 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1454 | if (opt != np->opt) | |
1455 | sock_kfree_s(sk, opt, opt->tot_len); | |
1456 | } | |
1457 | ||
d83d8461 | 1458 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1459 | if (newnp->opt) |
d83d8461 ACM |
1460 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1461 | newnp->opt->opt_flen); | |
1da177e4 | 1462 | |
5d424d5a | 1463 | tcp_mtup_init(newsk); |
1da177e4 LT |
1464 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1465 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1466 | tcp_initialize_rcv_mss(newsk); | |
1467 | ||
1468 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
1469 | ||
cfb6eeb4 YH |
1470 | #ifdef CONFIG_TCP_MD5SIG |
1471 | /* Copy over the MD5 key from the original socket */ | |
1472 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1473 | /* We're using one, so create a matching key | |
1474 | * on the newsk structure. If we fail to get | |
1475 | * memory, then we end up not copying the key | |
1476 | * across. Shucks. | |
1477 | */ | |
af879cc7 ACM |
1478 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1479 | if (newkey != NULL) | |
cfb6eeb4 YH |
1480 | tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr, |
1481 | newkey, key->keylen); | |
cfb6eeb4 YH |
1482 | } |
1483 | #endif | |
1484 | ||
ab1e0a13 | 1485 | __inet6_hash(newsk); |
e56d8b8a | 1486 | __inet_inherit_port(sk, newsk); |
1da177e4 LT |
1487 | |
1488 | return newsk; | |
1489 | ||
1490 | out_overflow: | |
de0744af | 1491 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
1da177e4 | 1492 | out: |
de0744af | 1493 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1494 | if (opt && opt != np->opt) |
1495 | sock_kfree_s(sk, opt, opt->tot_len); | |
1496 | dst_release(dst); | |
1497 | return NULL; | |
1498 | } | |
1499 | ||
b51655b9 | 1500 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1501 | { |
84fa7933 | 1502 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
aa8223c7 | 1503 | if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1504 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1505 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1506 | return 0; |
fb286bb2 | 1507 | } |
1da177e4 | 1508 | } |
fb286bb2 | 1509 | |
aa8223c7 | 1510 | skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len, |
0660e03f ACM |
1511 | &ipv6_hdr(skb)->saddr, |
1512 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1513 | |
1da177e4 | 1514 | if (skb->len <= 76) { |
fb286bb2 | 1515 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1516 | } |
1517 | return 0; | |
1518 | } | |
1519 | ||
1520 | /* The socket must have it's spinlock held when we get | |
1521 | * here. | |
1522 | * | |
1523 | * We have a potential double-lock case here, so even when | |
1524 | * doing backlog processing we use the BH locking scheme. | |
1525 | * This is because we cannot sleep with the original spinlock | |
1526 | * held. | |
1527 | */ | |
1528 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1529 | { | |
1530 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1531 | struct tcp_sock *tp; | |
1532 | struct sk_buff *opt_skb = NULL; | |
1533 | ||
1534 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1535 | goes to IPv4 receive handler and backlogged. | |
1536 | From backlog it always goes here. Kerboom... | |
1537 | Fortunately, tcp_rcv_established and rcv_established | |
1538 | handle them correctly, but it is not case with | |
1539 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1540 | */ | |
1541 | ||
1542 | if (skb->protocol == htons(ETH_P_IP)) | |
1543 | return tcp_v4_do_rcv(sk, skb); | |
1544 | ||
cfb6eeb4 YH |
1545 | #ifdef CONFIG_TCP_MD5SIG |
1546 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1547 | goto discard; | |
1548 | #endif | |
1549 | ||
fda9ef5d | 1550 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1551 | goto discard; |
1552 | ||
1553 | /* | |
1554 | * socket locking is here for SMP purposes as backlog rcv | |
1555 | * is currently called with bh processing disabled. | |
1556 | */ | |
1557 | ||
1558 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1559 | ||
1560 | Yes, guys, it is the only place in our code, where we | |
1561 | may make it not affecting IPv4. | |
1562 | The rest of code is protocol independent, | |
1563 | and I do not like idea to uglify IPv4. | |
1564 | ||
1565 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1566 | looks not very well thought. For now we latch | |
1567 | options, received in the last packet, enqueued | |
1568 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1569 | --ANK (980728) |
1da177e4 LT |
1570 | */ |
1571 | if (np->rxopt.all) | |
1572 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1573 | ||
1574 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1575 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1576 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1577 | goto reset; |
1578 | TCP_CHECK_TIMER(sk); | |
1579 | if (opt_skb) | |
1580 | goto ipv6_pktoptions; | |
1581 | return 0; | |
1582 | } | |
1583 | ||
ab6a5bb6 | 1584 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1585 | goto csum_err; |
1586 | ||
1ab1457c | 1587 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1588 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1589 | if (!nsk) | |
1590 | goto discard; | |
1591 | ||
1592 | /* | |
1593 | * Queue it on the new socket if the new socket is active, | |
1594 | * otherwise we just shortcircuit this and continue with | |
1595 | * the new socket.. | |
1596 | */ | |
1ab1457c | 1597 | if(nsk != sk) { |
1da177e4 LT |
1598 | if (tcp_child_process(sk, nsk, skb)) |
1599 | goto reset; | |
1600 | if (opt_skb) | |
1601 | __kfree_skb(opt_skb); | |
1602 | return 0; | |
1603 | } | |
1604 | } | |
1605 | ||
1606 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1607 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1608 | goto reset; |
1609 | TCP_CHECK_TIMER(sk); | |
1610 | if (opt_skb) | |
1611 | goto ipv6_pktoptions; | |
1612 | return 0; | |
1613 | ||
1614 | reset: | |
cfb6eeb4 | 1615 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1616 | discard: |
1617 | if (opt_skb) | |
1618 | __kfree_skb(opt_skb); | |
1619 | kfree_skb(skb); | |
1620 | return 0; | |
1621 | csum_err: | |
63231bdd | 1622 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1623 | goto discard; |
1624 | ||
1625 | ||
1626 | ipv6_pktoptions: | |
1627 | /* Do you ask, what is it? | |
1628 | ||
1629 | 1. skb was enqueued by tcp. | |
1630 | 2. skb is added to tail of read queue, rather than out of order. | |
1631 | 3. socket is not in passive state. | |
1632 | 4. Finally, it really contains options, which user wants to receive. | |
1633 | */ | |
1634 | tp = tcp_sk(sk); | |
1635 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1636 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1637 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1638 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1639 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1640 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
1da177e4 LT |
1641 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1642 | skb_set_owner_r(opt_skb, sk); | |
1643 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1644 | } else { | |
1645 | __kfree_skb(opt_skb); | |
1646 | opt_skb = xchg(&np->pktoptions, NULL); | |
1647 | } | |
1648 | } | |
1649 | ||
1650 | if (opt_skb) | |
1651 | kfree_skb(opt_skb); | |
1652 | return 0; | |
1653 | } | |
1654 | ||
e5bbef20 | 1655 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1656 | { |
1ab1457c | 1657 | struct tcphdr *th; |
1da177e4 LT |
1658 | struct sock *sk; |
1659 | int ret; | |
a86b1e30 | 1660 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1661 | |
1662 | if (skb->pkt_type != PACKET_HOST) | |
1663 | goto discard_it; | |
1664 | ||
1665 | /* | |
1666 | * Count it even if it's bad. | |
1667 | */ | |
63231bdd | 1668 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1669 | |
1670 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1671 | goto discard_it; | |
1672 | ||
aa8223c7 | 1673 | th = tcp_hdr(skb); |
1da177e4 LT |
1674 | |
1675 | if (th->doff < sizeof(struct tcphdr)/4) | |
1676 | goto bad_packet; | |
1677 | if (!pskb_may_pull(skb, th->doff*4)) | |
1678 | goto discard_it; | |
1679 | ||
60476372 | 1680 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1da177e4 LT |
1681 | goto bad_packet; |
1682 | ||
aa8223c7 | 1683 | th = tcp_hdr(skb); |
1da177e4 LT |
1684 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1685 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1686 | skb->len - th->doff*4); | |
1687 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1688 | TCP_SKB_CB(skb)->when = 0; | |
0660e03f | 1689 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 LT |
1690 | TCP_SKB_CB(skb)->sacked = 0; |
1691 | ||
a86b1e30 | 1692 | sk = __inet6_lookup(net, &tcp_hashinfo, |
d86e0dac PE |
1693 | &ipv6_hdr(skb)->saddr, th->source, |
1694 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), | |
1695 | inet6_iif(skb)); | |
1da177e4 LT |
1696 | |
1697 | if (!sk) | |
1698 | goto no_tcp_socket; | |
1699 | ||
1700 | process: | |
1701 | if (sk->sk_state == TCP_TIME_WAIT) | |
1702 | goto do_time_wait; | |
1703 | ||
1704 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1705 | goto discard_and_relse; | |
1706 | ||
fda9ef5d | 1707 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1708 | goto discard_and_relse; |
1709 | ||
1710 | skb->dev = NULL; | |
1711 | ||
293b9c42 | 1712 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1713 | ret = 0; |
1714 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1715 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1716 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a DM |
1717 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
1718 | tp->ucopy.dma_chan = get_softnet_dma(); | |
1ab1457c YH |
1719 | if (tp->ucopy.dma_chan) |
1720 | ret = tcp_v6_do_rcv(sk, skb); | |
1721 | else | |
1a2449a8 CL |
1722 | #endif |
1723 | { | |
1724 | if (!tcp_prequeue(sk, skb)) | |
1725 | ret = tcp_v6_do_rcv(sk, skb); | |
1726 | } | |
1da177e4 LT |
1727 | } else |
1728 | sk_add_backlog(sk, skb); | |
1729 | bh_unlock_sock(sk); | |
1730 | ||
1731 | sock_put(sk); | |
1732 | return ret ? -1 : 0; | |
1733 | ||
1734 | no_tcp_socket: | |
1735 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1736 | goto discard_it; | |
1737 | ||
1738 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1739 | bad_packet: | |
63231bdd | 1740 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1741 | } else { |
cfb6eeb4 | 1742 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1743 | } |
1744 | ||
1745 | discard_it: | |
1746 | ||
1747 | /* | |
1748 | * Discard frame | |
1749 | */ | |
1750 | ||
1751 | kfree_skb(skb); | |
1752 | return 0; | |
1753 | ||
1754 | discard_and_relse: | |
1755 | sock_put(sk); | |
1756 | goto discard_it; | |
1757 | ||
1758 | do_time_wait: | |
1759 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1760 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1761 | goto discard_it; |
1762 | } | |
1763 | ||
1764 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
63231bdd | 1765 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
9469c7b4 | 1766 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1767 | goto discard_it; |
1768 | } | |
1769 | ||
9469c7b4 | 1770 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1771 | case TCP_TW_SYN: |
1772 | { | |
1773 | struct sock *sk2; | |
1774 | ||
c346dca1 | 1775 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
0660e03f | 1776 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1777 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1778 | if (sk2 != NULL) { |
295ff7ed ACM |
1779 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1780 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1781 | inet_twsk_put(tw); | |
1da177e4 LT |
1782 | sk = sk2; |
1783 | goto process; | |
1784 | } | |
1785 | /* Fall through to ACK */ | |
1786 | } | |
1787 | case TCP_TW_ACK: | |
1788 | tcp_v6_timewait_ack(sk, skb); | |
1789 | break; | |
1790 | case TCP_TW_RST: | |
1791 | goto no_tcp_socket; | |
1792 | case TCP_TW_SUCCESS:; | |
1793 | } | |
1794 | goto discard_it; | |
1795 | } | |
1796 | ||
1da177e4 LT |
1797 | static int tcp_v6_remember_stamp(struct sock *sk) |
1798 | { | |
1799 | /* Alas, not yet... */ | |
1800 | return 0; | |
1801 | } | |
1802 | ||
8292a17a | 1803 | static struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1804 | .queue_xmit = inet6_csk_xmit, |
1805 | .send_check = tcp_v6_send_check, | |
1806 | .rebuild_header = inet6_sk_rebuild_header, | |
1807 | .conn_request = tcp_v6_conn_request, | |
1808 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1809 | .remember_stamp = tcp_v6_remember_stamp, | |
1810 | .net_header_len = sizeof(struct ipv6hdr), | |
1811 | .setsockopt = ipv6_setsockopt, | |
1812 | .getsockopt = ipv6_getsockopt, | |
1813 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1814 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1815 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1816 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1817 | .compat_setsockopt = compat_ipv6_setsockopt, |
1818 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1819 | #endif |
1da177e4 LT |
1820 | }; |
1821 | ||
cfb6eeb4 | 1822 | #ifdef CONFIG_TCP_MD5SIG |
a928630a | 1823 | static struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1824 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1825 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 YH |
1826 | .md5_add = tcp_v6_md5_add_func, |
1827 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1828 | }; |
a928630a | 1829 | #endif |
cfb6eeb4 | 1830 | |
1da177e4 LT |
1831 | /* |
1832 | * TCP over IPv4 via INET6 API | |
1833 | */ | |
1834 | ||
8292a17a | 1835 | static struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1836 | .queue_xmit = ip_queue_xmit, |
1837 | .send_check = tcp_v4_send_check, | |
1838 | .rebuild_header = inet_sk_rebuild_header, | |
1839 | .conn_request = tcp_v6_conn_request, | |
1840 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1841 | .remember_stamp = tcp_v4_remember_stamp, | |
1842 | .net_header_len = sizeof(struct iphdr), | |
1843 | .setsockopt = ipv6_setsockopt, | |
1844 | .getsockopt = ipv6_getsockopt, | |
1845 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1846 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1847 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1848 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1849 | .compat_setsockopt = compat_ipv6_setsockopt, |
1850 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1851 | #endif |
1da177e4 LT |
1852 | }; |
1853 | ||
cfb6eeb4 | 1854 | #ifdef CONFIG_TCP_MD5SIG |
a928630a | 1855 | static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1856 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1857 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 YH |
1858 | .md5_add = tcp_v6_md5_add_func, |
1859 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1860 | }; |
a928630a | 1861 | #endif |
cfb6eeb4 | 1862 | |
1da177e4 LT |
1863 | /* NOTE: A lot of things set to zero explicitly by call to |
1864 | * sk_alloc() so need not be done here. | |
1865 | */ | |
1866 | static int tcp_v6_init_sock(struct sock *sk) | |
1867 | { | |
6687e988 | 1868 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1869 | struct tcp_sock *tp = tcp_sk(sk); |
1870 | ||
1871 | skb_queue_head_init(&tp->out_of_order_queue); | |
1872 | tcp_init_xmit_timers(sk); | |
1873 | tcp_prequeue_init(tp); | |
1874 | ||
6687e988 | 1875 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1876 | tp->mdev = TCP_TIMEOUT_INIT; |
1877 | ||
1878 | /* So many TCP implementations out there (incorrectly) count the | |
1879 | * initial SYN frame in their delayed-ACK and congestion control | |
1880 | * algorithms that we must have the following bandaid to talk | |
1881 | * efficiently to them. -DaveM | |
1882 | */ | |
1883 | tp->snd_cwnd = 2; | |
1884 | ||
1885 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1886 | * initialization of these values. | |
1887 | */ | |
1888 | tp->snd_ssthresh = 0x7fffffff; | |
1889 | tp->snd_cwnd_clamp = ~0; | |
c1b4a7e6 | 1890 | tp->mss_cache = 536; |
1da177e4 LT |
1891 | |
1892 | tp->reordering = sysctl_tcp_reordering; | |
1893 | ||
1894 | sk->sk_state = TCP_CLOSE; | |
1895 | ||
8292a17a | 1896 | icsk->icsk_af_ops = &ipv6_specific; |
6687e988 | 1897 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
d83d8461 | 1898 | icsk->icsk_sync_mss = tcp_sync_mss; |
1da177e4 LT |
1899 | sk->sk_write_space = sk_stream_write_space; |
1900 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1901 | ||
cfb6eeb4 YH |
1902 | #ifdef CONFIG_TCP_MD5SIG |
1903 | tp->af_specific = &tcp_sock_ipv6_specific; | |
1904 | #endif | |
1905 | ||
1da177e4 LT |
1906 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
1907 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1908 | ||
1909 | atomic_inc(&tcp_sockets_allocated); | |
1910 | ||
1911 | return 0; | |
1912 | } | |
1913 | ||
7d06b2e0 | 1914 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1915 | { |
cfb6eeb4 YH |
1916 | #ifdef CONFIG_TCP_MD5SIG |
1917 | /* Clean up the MD5 key list */ | |
1918 | if (tcp_sk(sk)->md5sig_info) | |
1919 | tcp_v6_clear_md5_list(sk); | |
1920 | #endif | |
1da177e4 | 1921 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1922 | inet6_destroy_sock(sk); |
1da177e4 LT |
1923 | } |
1924 | ||
952a10be | 1925 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1926 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1927 | static void get_openreq6(struct seq_file *seq, |
60236fdd | 1928 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 1929 | { |
1da177e4 | 1930 | int ttd = req->expires - jiffies; |
ca304b61 ACM |
1931 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1932 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1933 | |
1934 | if (ttd < 0) | |
1935 | ttd = 0; | |
1936 | ||
1da177e4 LT |
1937 | seq_printf(seq, |
1938 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1939 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1940 | i, | |
1941 | src->s6_addr32[0], src->s6_addr32[1], | |
1942 | src->s6_addr32[2], src->s6_addr32[3], | |
1943 | ntohs(inet_sk(sk)->sport), | |
1944 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1945 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1946 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1947 | TCP_SYN_RECV, |
1948 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
1949 | 1, /* timers active (only the expire timer) */ |
1950 | jiffies_to_clock_t(ttd), | |
1da177e4 LT |
1951 | req->retrans, |
1952 | uid, | |
1ab1457c | 1953 | 0, /* non standard timer */ |
1da177e4 LT |
1954 | 0, /* open_requests have no inode */ |
1955 | 0, req); | |
1956 | } | |
1957 | ||
1958 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1959 | { | |
1960 | struct in6_addr *dest, *src; | |
1961 | __u16 destp, srcp; | |
1962 | int timer_active; | |
1963 | unsigned long timer_expires; | |
1964 | struct inet_sock *inet = inet_sk(sp); | |
1965 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1966 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
1967 | struct ipv6_pinfo *np = inet6_sk(sp); |
1968 | ||
1969 | dest = &np->daddr; | |
1970 | src = &np->rcv_saddr; | |
1971 | destp = ntohs(inet->dport); | |
1972 | srcp = ntohs(inet->sport); | |
463c84b9 ACM |
1973 | |
1974 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1975 | timer_active = 1; |
463c84b9 ACM |
1976 | timer_expires = icsk->icsk_timeout; |
1977 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1978 | timer_active = 4; |
463c84b9 | 1979 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1980 | } else if (timer_pending(&sp->sk_timer)) { |
1981 | timer_active = 2; | |
1982 | timer_expires = sp->sk_timer.expires; | |
1983 | } else { | |
1984 | timer_active = 0; | |
1985 | timer_expires = jiffies; | |
1986 | } | |
1987 | ||
1988 | seq_printf(seq, | |
1989 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
7be87351 | 1990 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n", |
1da177e4 LT |
1991 | i, |
1992 | src->s6_addr32[0], src->s6_addr32[1], | |
1993 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1994 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1995 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1996 | sp->sk_state, |
47da8ee6 SS |
1997 | tp->write_seq-tp->snd_una, |
1998 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 LT |
1999 | timer_active, |
2000 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 2001 | icsk->icsk_retransmits, |
1da177e4 | 2002 | sock_i_uid(sp), |
6687e988 | 2003 | icsk->icsk_probes_out, |
1da177e4 LT |
2004 | sock_i_ino(sp), |
2005 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
2006 | jiffies_to_clock_t(icsk->icsk_rto), |
2007 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 2008 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
1da177e4 LT |
2009 | tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh |
2010 | ); | |
2011 | } | |
2012 | ||
1ab1457c | 2013 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 2014 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
2015 | { |
2016 | struct in6_addr *dest, *src; | |
2017 | __u16 destp, srcp; | |
0fa1a53e | 2018 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
2019 | int ttd = tw->tw_ttd - jiffies; |
2020 | ||
2021 | if (ttd < 0) | |
2022 | ttd = 0; | |
2023 | ||
0fa1a53e ACM |
2024 | dest = &tw6->tw_v6_daddr; |
2025 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
2026 | destp = ntohs(tw->tw_dport); |
2027 | srcp = ntohs(tw->tw_sport); | |
2028 | ||
2029 | seq_printf(seq, | |
2030 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2031 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
2032 | i, | |
2033 | src->s6_addr32[0], src->s6_addr32[1], | |
2034 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2035 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2036 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2037 | tw->tw_substate, 0, 0, | |
2038 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2039 | atomic_read(&tw->tw_refcnt), tw); | |
2040 | } | |
2041 | ||
1da177e4 LT |
2042 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
2043 | { | |
2044 | struct tcp_iter_state *st; | |
2045 | ||
2046 | if (v == SEQ_START_TOKEN) { | |
2047 | seq_puts(seq, | |
2048 | " sl " | |
2049 | "local_address " | |
2050 | "remote_address " | |
2051 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2052 | " uid timeout inode\n"); | |
2053 | goto out; | |
2054 | } | |
2055 | st = seq->private; | |
2056 | ||
2057 | switch (st->state) { | |
2058 | case TCP_SEQ_STATE_LISTENING: | |
2059 | case TCP_SEQ_STATE_ESTABLISHED: | |
2060 | get_tcp6_sock(seq, v, st->num); | |
2061 | break; | |
2062 | case TCP_SEQ_STATE_OPENREQ: | |
2063 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
2064 | break; | |
2065 | case TCP_SEQ_STATE_TIME_WAIT: | |
2066 | get_timewait6_sock(seq, v, st->num); | |
2067 | break; | |
2068 | } | |
2069 | out: | |
2070 | return 0; | |
2071 | } | |
2072 | ||
1da177e4 | 2073 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
2074 | .name = "tcp6", |
2075 | .family = AF_INET6, | |
5f4472c5 DL |
2076 | .seq_fops = { |
2077 | .owner = THIS_MODULE, | |
2078 | }, | |
9427c4b3 DL |
2079 | .seq_ops = { |
2080 | .show = tcp6_seq_show, | |
2081 | }, | |
1da177e4 LT |
2082 | }; |
2083 | ||
6f8b13bc | 2084 | int tcp6_proc_init(struct net *net) |
1da177e4 | 2085 | { |
6f8b13bc | 2086 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2087 | } |
2088 | ||
6f8b13bc | 2089 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2090 | { |
6f8b13bc | 2091 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2092 | } |
2093 | #endif | |
2094 | ||
2095 | struct proto tcpv6_prot = { | |
2096 | .name = "TCPv6", | |
2097 | .owner = THIS_MODULE, | |
2098 | .close = tcp_close, | |
2099 | .connect = tcp_v6_connect, | |
2100 | .disconnect = tcp_disconnect, | |
463c84b9 | 2101 | .accept = inet_csk_accept, |
1da177e4 LT |
2102 | .ioctl = tcp_ioctl, |
2103 | .init = tcp_v6_init_sock, | |
2104 | .destroy = tcp_v6_destroy_sock, | |
2105 | .shutdown = tcp_shutdown, | |
2106 | .setsockopt = tcp_setsockopt, | |
2107 | .getsockopt = tcp_getsockopt, | |
1da177e4 LT |
2108 | .recvmsg = tcp_recvmsg, |
2109 | .backlog_rcv = tcp_v6_do_rcv, | |
2110 | .hash = tcp_v6_hash, | |
ab1e0a13 ACM |
2111 | .unhash = inet_unhash, |
2112 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2113 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2114 | .sockets_allocated = &tcp_sockets_allocated, | |
2115 | .memory_allocated = &tcp_memory_allocated, | |
2116 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2117 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2118 | .sysctl_mem = sysctl_tcp_mem, |
2119 | .sysctl_wmem = sysctl_tcp_wmem, | |
2120 | .sysctl_rmem = sysctl_tcp_rmem, | |
2121 | .max_header = MAX_TCP_HEADER, | |
2122 | .obj_size = sizeof(struct tcp6_sock), | |
6d6ee43e | 2123 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2124 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2125 | .h.hashinfo = &tcp_hashinfo, |
543d9cfe ACM |
2126 | #ifdef CONFIG_COMPAT |
2127 | .compat_setsockopt = compat_tcp_setsockopt, | |
2128 | .compat_getsockopt = compat_tcp_getsockopt, | |
2129 | #endif | |
1da177e4 LT |
2130 | }; |
2131 | ||
2132 | static struct inet6_protocol tcpv6_protocol = { | |
2133 | .handler = tcp_v6_rcv, | |
2134 | .err_handler = tcp_v6_err, | |
a430a43d | 2135 | .gso_send_check = tcp_v6_gso_send_check, |
adcfc7d0 | 2136 | .gso_segment = tcp_tso_segment, |
1da177e4 LT |
2137 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
2138 | }; | |
2139 | ||
1da177e4 LT |
2140 | static struct inet_protosw tcpv6_protosw = { |
2141 | .type = SOCK_STREAM, | |
2142 | .protocol = IPPROTO_TCP, | |
2143 | .prot = &tcpv6_prot, | |
2144 | .ops = &inet6_stream_ops, | |
2145 | .capability = -1, | |
2146 | .no_check = 0, | |
d83d8461 ACM |
2147 | .flags = INET_PROTOSW_PERMANENT | |
2148 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2149 | }; |
2150 | ||
93ec926b DL |
2151 | static int tcpv6_net_init(struct net *net) |
2152 | { | |
5677242f DL |
2153 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2154 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2155 | } |
2156 | ||
2157 | static void tcpv6_net_exit(struct net *net) | |
2158 | { | |
5677242f | 2159 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
93ec926b DL |
2160 | } |
2161 | ||
2162 | static struct pernet_operations tcpv6_net_ops = { | |
2163 | .init = tcpv6_net_init, | |
2164 | .exit = tcpv6_net_exit, | |
2165 | }; | |
2166 | ||
7f4e4868 | 2167 | int __init tcpv6_init(void) |
1da177e4 | 2168 | { |
7f4e4868 DL |
2169 | int ret; |
2170 | ||
2171 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2172 | if (ret) | |
2173 | goto out; | |
2174 | ||
1da177e4 | 2175 | /* register inet6 protocol */ |
7f4e4868 DL |
2176 | ret = inet6_register_protosw(&tcpv6_protosw); |
2177 | if (ret) | |
2178 | goto out_tcpv6_protocol; | |
2179 | ||
93ec926b | 2180 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2181 | if (ret) |
2182 | goto out_tcpv6_protosw; | |
2183 | out: | |
2184 | return ret; | |
ae0f7d5f | 2185 | |
7f4e4868 DL |
2186 | out_tcpv6_protocol: |
2187 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2188 | out_tcpv6_protosw: | |
2189 | inet6_unregister_protosw(&tcpv6_protosw); | |
2190 | goto out; | |
2191 | } | |
2192 | ||
09f7709f | 2193 | void tcpv6_exit(void) |
7f4e4868 | 2194 | { |
93ec926b | 2195 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2196 | inet6_unregister_protosw(&tcpv6_protosw); |
2197 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2198 | } |