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) { | |
e41b5368 DL |
333 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
334 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
335 | return; |
336 | } | |
337 | ||
338 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 339 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
340 | return; |
341 | } | |
342 | ||
343 | bh_lock_sock(sk); | |
344 | if (sock_owned_by_user(sk)) | |
de0744af | 345 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
346 | |
347 | if (sk->sk_state == TCP_CLOSE) | |
348 | goto out; | |
349 | ||
350 | tp = tcp_sk(sk); | |
1ab1457c | 351 | seq = ntohl(th->seq); |
1da177e4 LT |
352 | if (sk->sk_state != TCP_LISTEN && |
353 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
de0744af | 354 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
355 | goto out; |
356 | } | |
357 | ||
358 | np = inet6_sk(sk); | |
359 | ||
360 | if (type == ICMPV6_PKT_TOOBIG) { | |
361 | struct dst_entry *dst = NULL; | |
362 | ||
363 | if (sock_owned_by_user(sk)) | |
364 | goto out; | |
365 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
366 | goto out; | |
367 | ||
368 | /* icmp should have updated the destination cache entry */ | |
369 | dst = __sk_dst_check(sk, np->dst_cookie); | |
370 | ||
371 | if (dst == NULL) { | |
372 | struct inet_sock *inet = inet_sk(sk); | |
373 | struct flowi fl; | |
374 | ||
375 | /* BUGGG_FUTURE: Again, it is not clear how | |
376 | to handle rthdr case. Ignore this complexity | |
377 | for now. | |
378 | */ | |
379 | memset(&fl, 0, sizeof(fl)); | |
380 | fl.proto = IPPROTO_TCP; | |
381 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
382 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
383 | fl.oif = sk->sk_bound_dev_if; | |
384 | fl.fl_ip_dport = inet->dport; | |
385 | fl.fl_ip_sport = inet->sport; | |
beb8d13b | 386 | security_skb_classify_flow(skb, &fl); |
1da177e4 LT |
387 | |
388 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
389 | sk->sk_err_soft = -err; | |
390 | goto out; | |
391 | } | |
392 | ||
393 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
394 | sk->sk_err_soft = -err; | |
395 | goto out; | |
396 | } | |
397 | ||
398 | } else | |
399 | dst_hold(dst); | |
400 | ||
d83d8461 | 401 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
1da177e4 LT |
402 | tcp_sync_mss(sk, dst_mtu(dst)); |
403 | tcp_simple_retransmit(sk); | |
404 | } /* else let the usual retransmit timer handle it */ | |
405 | dst_release(dst); | |
406 | goto out; | |
407 | } | |
408 | ||
409 | icmpv6_err_convert(type, code, &err); | |
410 | ||
60236fdd | 411 | /* Might be for an request_sock */ |
1da177e4 | 412 | switch (sk->sk_state) { |
60236fdd | 413 | struct request_sock *req, **prev; |
1da177e4 LT |
414 | case TCP_LISTEN: |
415 | if (sock_owned_by_user(sk)) | |
416 | goto out; | |
417 | ||
8129765a ACM |
418 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
419 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
420 | if (!req) |
421 | goto out; | |
422 | ||
423 | /* ICMPs are not backlogged, hence we cannot get | |
424 | * an established socket here. | |
425 | */ | |
547b792c | 426 | WARN_ON(req->sk != NULL); |
1da177e4 | 427 | |
2e6599cb | 428 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 429 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
430 | goto out; |
431 | } | |
432 | ||
463c84b9 | 433 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
434 | goto out; |
435 | ||
436 | case TCP_SYN_SENT: | |
437 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 438 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 439 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
440 | sk->sk_err = err; |
441 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
442 | ||
443 | tcp_done(sk); | |
444 | } else | |
445 | sk->sk_err_soft = err; | |
446 | goto out; | |
447 | } | |
448 | ||
449 | if (!sock_owned_by_user(sk) && np->recverr) { | |
450 | sk->sk_err = err; | |
451 | sk->sk_error_report(sk); | |
452 | } else | |
453 | sk->sk_err_soft = err; | |
454 | ||
455 | out: | |
456 | bh_unlock_sock(sk); | |
457 | sock_put(sk); | |
458 | } | |
459 | ||
460 | ||
fd80eb94 | 461 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req) |
1da177e4 | 462 | { |
ca304b61 | 463 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
464 | struct ipv6_pinfo *np = inet6_sk(sk); |
465 | struct sk_buff * skb; | |
466 | struct ipv6_txoptions *opt = NULL; | |
467 | struct in6_addr * final_p = NULL, final; | |
468 | struct flowi fl; | |
fd80eb94 | 469 | struct dst_entry *dst; |
1da177e4 LT |
470 | int err = -1; |
471 | ||
472 | memset(&fl, 0, sizeof(fl)); | |
473 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
474 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
475 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 476 | fl.fl6_flowlabel = 0; |
2e6599cb ACM |
477 | fl.oif = treq->iif; |
478 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
fd507037 | 479 | fl.fl_ip_sport = inet_rsk(req)->loc_port; |
4237c75c | 480 | security_req_classify_flow(req, &fl); |
1da177e4 | 481 | |
fd80eb94 DL |
482 | opt = np->opt; |
483 | if (opt && opt->srcrt) { | |
484 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
485 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
486 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
487 | final_p = &final; | |
1da177e4 LT |
488 | } |
489 | ||
fd80eb94 DL |
490 | err = ip6_dst_lookup(sk, &dst, &fl); |
491 | if (err) | |
492 | goto done; | |
493 | if (final_p) | |
494 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
495 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
496 | goto done; | |
497 | ||
1da177e4 LT |
498 | skb = tcp_make_synack(sk, dst, req); |
499 | if (skb) { | |
aa8223c7 | 500 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
501 | |
502 | th->check = tcp_v6_check(th, skb->len, | |
2e6599cb | 503 | &treq->loc_addr, &treq->rmt_addr, |
1da177e4 LT |
504 | csum_partial((char *)th, skb->len, skb->csum)); |
505 | ||
2e6599cb | 506 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 | 507 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
b9df3cb8 | 508 | err = net_xmit_eval(err); |
1da177e4 LT |
509 | } |
510 | ||
511 | done: | |
1ab1457c | 512 | if (opt && opt != np->opt) |
1da177e4 | 513 | sock_kfree_s(sk, opt, opt->tot_len); |
78b91042 | 514 | dst_release(dst); |
1da177e4 LT |
515 | return err; |
516 | } | |
517 | ||
c6aefafb GG |
518 | static inline void syn_flood_warning(struct sk_buff *skb) |
519 | { | |
520 | #ifdef CONFIG_SYN_COOKIES | |
521 | if (sysctl_tcp_syncookies) | |
522 | printk(KERN_INFO | |
523 | "TCPv6: Possible SYN flooding on port %d. " | |
524 | "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest)); | |
525 | else | |
526 | #endif | |
527 | printk(KERN_INFO | |
528 | "TCPv6: Possible SYN flooding on port %d. " | |
529 | "Dropping request.\n", ntohs(tcp_hdr(skb)->dest)); | |
530 | } | |
531 | ||
60236fdd | 532 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 533 | { |
ca304b61 ACM |
534 | if (inet6_rsk(req)->pktopts) |
535 | kfree_skb(inet6_rsk(req)->pktopts); | |
1da177e4 LT |
536 | } |
537 | ||
cfb6eeb4 YH |
538 | #ifdef CONFIG_TCP_MD5SIG |
539 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
540 | struct in6_addr *addr) | |
541 | { | |
542 | struct tcp_sock *tp = tcp_sk(sk); | |
543 | int i; | |
544 | ||
545 | BUG_ON(tp == NULL); | |
546 | ||
547 | if (!tp->md5sig_info || !tp->md5sig_info->entries6) | |
548 | return NULL; | |
549 | ||
550 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 551 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr)) |
f8ab18d2 | 552 | return &tp->md5sig_info->keys6[i].base; |
cfb6eeb4 YH |
553 | } |
554 | return NULL; | |
555 | } | |
556 | ||
557 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
558 | struct sock *addr_sk) | |
559 | { | |
560 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); | |
561 | } | |
562 | ||
563 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
564 | struct request_sock *req) | |
565 | { | |
566 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
567 | } | |
568 | ||
569 | static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer, | |
570 | char *newkey, u8 newkeylen) | |
571 | { | |
572 | /* Add key to the list */ | |
b0a713e9 | 573 | struct tcp_md5sig_key *key; |
cfb6eeb4 YH |
574 | struct tcp_sock *tp = tcp_sk(sk); |
575 | struct tcp6_md5sig_key *keys; | |
576 | ||
b0a713e9 | 577 | key = tcp_v6_md5_do_lookup(sk, peer); |
cfb6eeb4 YH |
578 | if (key) { |
579 | /* modify existing entry - just update that one */ | |
b0a713e9 MD |
580 | kfree(key->key); |
581 | key->key = newkey; | |
582 | key->keylen = newkeylen; | |
cfb6eeb4 YH |
583 | } else { |
584 | /* reallocate new list if current one is full. */ | |
585 | if (!tp->md5sig_info) { | |
586 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC); | |
587 | if (!tp->md5sig_info) { | |
588 | kfree(newkey); | |
589 | return -ENOMEM; | |
590 | } | |
3d7dbeac | 591 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 | 592 | } |
aacbe8c8 YH |
593 | if (tcp_alloc_md5sig_pool() == NULL) { |
594 | kfree(newkey); | |
595 | return -ENOMEM; | |
596 | } | |
cfb6eeb4 YH |
597 | if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) { |
598 | keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) * | |
599 | (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC); | |
600 | ||
601 | if (!keys) { | |
602 | tcp_free_md5sig_pool(); | |
603 | kfree(newkey); | |
604 | return -ENOMEM; | |
605 | } | |
606 | ||
607 | if (tp->md5sig_info->entries6) | |
608 | memmove(keys, tp->md5sig_info->keys6, | |
609 | (sizeof (tp->md5sig_info->keys6[0]) * | |
610 | tp->md5sig_info->entries6)); | |
611 | ||
612 | kfree(tp->md5sig_info->keys6); | |
613 | tp->md5sig_info->keys6 = keys; | |
614 | tp->md5sig_info->alloced6++; | |
615 | } | |
616 | ||
617 | ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr, | |
618 | peer); | |
f8ab18d2 DM |
619 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey; |
620 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen; | |
cfb6eeb4 YH |
621 | |
622 | tp->md5sig_info->entries6++; | |
623 | } | |
624 | return 0; | |
625 | } | |
626 | ||
627 | static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk, | |
628 | u8 *newkey, __u8 newkeylen) | |
629 | { | |
630 | return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr, | |
631 | newkey, newkeylen); | |
632 | } | |
633 | ||
634 | static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer) | |
635 | { | |
636 | struct tcp_sock *tp = tcp_sk(sk); | |
637 | int i; | |
638 | ||
639 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 640 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) { |
cfb6eeb4 | 641 | /* Free the key */ |
f8ab18d2 | 642 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
643 | tp->md5sig_info->entries6--; |
644 | ||
645 | if (tp->md5sig_info->entries6 == 0) { | |
646 | kfree(tp->md5sig_info->keys6); | |
647 | tp->md5sig_info->keys6 = NULL; | |
ca983cef | 648 | tp->md5sig_info->alloced6 = 0; |
cfb6eeb4 YH |
649 | } else { |
650 | /* shrink the database */ | |
651 | if (tp->md5sig_info->entries6 != i) | |
652 | memmove(&tp->md5sig_info->keys6[i], | |
653 | &tp->md5sig_info->keys6[i+1], | |
654 | (tp->md5sig_info->entries6 - i) | |
655 | * sizeof (tp->md5sig_info->keys6[0])); | |
656 | } | |
77adefdc YH |
657 | tcp_free_md5sig_pool(); |
658 | return 0; | |
cfb6eeb4 YH |
659 | } |
660 | } | |
661 | return -ENOENT; | |
662 | } | |
663 | ||
664 | static void tcp_v6_clear_md5_list (struct sock *sk) | |
665 | { | |
666 | struct tcp_sock *tp = tcp_sk(sk); | |
667 | int i; | |
668 | ||
669 | if (tp->md5sig_info->entries6) { | |
670 | for (i = 0; i < tp->md5sig_info->entries6; i++) | |
f8ab18d2 | 671 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
672 | tp->md5sig_info->entries6 = 0; |
673 | tcp_free_md5sig_pool(); | |
674 | } | |
675 | ||
676 | kfree(tp->md5sig_info->keys6); | |
677 | tp->md5sig_info->keys6 = NULL; | |
678 | tp->md5sig_info->alloced6 = 0; | |
679 | ||
680 | if (tp->md5sig_info->entries4) { | |
681 | for (i = 0; i < tp->md5sig_info->entries4; i++) | |
f8ab18d2 | 682 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
683 | tp->md5sig_info->entries4 = 0; |
684 | tcp_free_md5sig_pool(); | |
685 | } | |
686 | ||
687 | kfree(tp->md5sig_info->keys4); | |
688 | tp->md5sig_info->keys4 = NULL; | |
689 | tp->md5sig_info->alloced4 = 0; | |
690 | } | |
691 | ||
692 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, | |
693 | int optlen) | |
694 | { | |
695 | struct tcp_md5sig cmd; | |
696 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
697 | u8 *newkey; | |
698 | ||
699 | if (optlen < sizeof(cmd)) | |
700 | return -EINVAL; | |
701 | ||
702 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
703 | return -EFAULT; | |
704 | ||
705 | if (sin6->sin6_family != AF_INET6) | |
706 | return -EINVAL; | |
707 | ||
708 | if (!cmd.tcpm_keylen) { | |
709 | if (!tcp_sk(sk)->md5sig_info) | |
710 | return -ENOENT; | |
e773e4fa | 711 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
cfb6eeb4 YH |
712 | return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]); |
713 | return tcp_v6_md5_do_del(sk, &sin6->sin6_addr); | |
714 | } | |
715 | ||
716 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
717 | return -EINVAL; | |
718 | ||
719 | if (!tcp_sk(sk)->md5sig_info) { | |
720 | struct tcp_sock *tp = tcp_sk(sk); | |
721 | struct tcp_md5sig_info *p; | |
722 | ||
723 | p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL); | |
724 | if (!p) | |
725 | return -ENOMEM; | |
726 | ||
727 | tp->md5sig_info = p; | |
3d7dbeac | 728 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 YH |
729 | } |
730 | ||
af879cc7 | 731 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
732 | if (!newkey) |
733 | return -ENOMEM; | |
e773e4fa | 734 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { |
cfb6eeb4 YH |
735 | return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3], |
736 | newkey, cmd.tcpm_keylen); | |
737 | } | |
738 | return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen); | |
739 | } | |
740 | ||
49a72dfb AL |
741 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
742 | struct in6_addr *daddr, | |
743 | struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 744 | { |
cfb6eeb4 | 745 | struct tcp6_pseudohdr *bp; |
49a72dfb | 746 | struct scatterlist sg; |
8d26d76d | 747 | |
cfb6eeb4 | 748 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 YH |
749 | /* 1. TCP pseudo-header (RFC2460) */ |
750 | ipv6_addr_copy(&bp->saddr, saddr); | |
751 | ipv6_addr_copy(&bp->daddr, daddr); | |
49a72dfb | 752 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 753 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 754 | |
49a72dfb AL |
755 | sg_init_one(&sg, bp, sizeof(*bp)); |
756 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
757 | } | |
c7da57a1 | 758 | |
49a72dfb AL |
759 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
760 | struct in6_addr *daddr, struct in6_addr *saddr, | |
761 | struct tcphdr *th) | |
762 | { | |
763 | struct tcp_md5sig_pool *hp; | |
764 | struct hash_desc *desc; | |
765 | ||
766 | hp = tcp_get_md5sig_pool(); | |
767 | if (!hp) | |
768 | goto clear_hash_noput; | |
769 | desc = &hp->md5_desc; | |
770 | ||
771 | if (crypto_hash_init(desc)) | |
772 | goto clear_hash; | |
773 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
774 | goto clear_hash; | |
775 | if (tcp_md5_hash_header(hp, th)) | |
776 | goto clear_hash; | |
777 | if (tcp_md5_hash_key(hp, key)) | |
778 | goto clear_hash; | |
779 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 780 | goto clear_hash; |
cfb6eeb4 | 781 | |
cfb6eeb4 | 782 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 783 | return 0; |
49a72dfb | 784 | |
cfb6eeb4 YH |
785 | clear_hash: |
786 | tcp_put_md5sig_pool(); | |
787 | clear_hash_noput: | |
788 | memset(md5_hash, 0, 16); | |
49a72dfb | 789 | return 1; |
cfb6eeb4 YH |
790 | } |
791 | ||
49a72dfb AL |
792 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
793 | struct sock *sk, struct request_sock *req, | |
794 | struct sk_buff *skb) | |
cfb6eeb4 YH |
795 | { |
796 | struct in6_addr *saddr, *daddr; | |
49a72dfb AL |
797 | struct tcp_md5sig_pool *hp; |
798 | struct hash_desc *desc; | |
799 | struct tcphdr *th = tcp_hdr(skb); | |
cfb6eeb4 YH |
800 | |
801 | if (sk) { | |
802 | saddr = &inet6_sk(sk)->saddr; | |
803 | daddr = &inet6_sk(sk)->daddr; | |
49a72dfb | 804 | } else if (req) { |
cfb6eeb4 YH |
805 | saddr = &inet6_rsk(req)->loc_addr; |
806 | daddr = &inet6_rsk(req)->rmt_addr; | |
49a72dfb AL |
807 | } else { |
808 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
809 | saddr = &ip6h->saddr; | |
810 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 811 | } |
49a72dfb AL |
812 | |
813 | hp = tcp_get_md5sig_pool(); | |
814 | if (!hp) | |
815 | goto clear_hash_noput; | |
816 | desc = &hp->md5_desc; | |
817 | ||
818 | if (crypto_hash_init(desc)) | |
819 | goto clear_hash; | |
820 | ||
821 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
822 | goto clear_hash; | |
823 | if (tcp_md5_hash_header(hp, th)) | |
824 | goto clear_hash; | |
825 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
826 | goto clear_hash; | |
827 | if (tcp_md5_hash_key(hp, key)) | |
828 | goto clear_hash; | |
829 | if (crypto_hash_final(desc, md5_hash)) | |
830 | goto clear_hash; | |
831 | ||
832 | tcp_put_md5sig_pool(); | |
833 | return 0; | |
834 | ||
835 | clear_hash: | |
836 | tcp_put_md5sig_pool(); | |
837 | clear_hash_noput: | |
838 | memset(md5_hash, 0, 16); | |
839 | return 1; | |
cfb6eeb4 YH |
840 | } |
841 | ||
842 | static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb) | |
843 | { | |
844 | __u8 *hash_location = NULL; | |
845 | struct tcp_md5sig_key *hash_expected; | |
0660e03f | 846 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
aa8223c7 | 847 | struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 848 | int genhash; |
cfb6eeb4 YH |
849 | u8 newhash[16]; |
850 | ||
851 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 852 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 853 | |
785957d3 DM |
854 | /* We've parsed the options - do we have a hash? */ |
855 | if (!hash_expected && !hash_location) | |
856 | return 0; | |
857 | ||
858 | if (hash_expected && !hash_location) { | |
859 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
860 | return 1; |
861 | } | |
862 | ||
785957d3 DM |
863 | if (!hash_expected && hash_location) { |
864 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
865 | return 1; |
866 | } | |
867 | ||
868 | /* check the signature */ | |
49a72dfb AL |
869 | genhash = tcp_v6_md5_hash_skb(newhash, |
870 | hash_expected, | |
871 | NULL, NULL, skb); | |
872 | ||
cfb6eeb4 YH |
873 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
874 | if (net_ratelimit()) { | |
875 | printk(KERN_INFO "MD5 Hash %s for " | |
876 | "(" NIP6_FMT ", %u)->" | |
877 | "(" NIP6_FMT ", %u)\n", | |
878 | genhash ? "failed" : "mismatch", | |
879 | NIP6(ip6h->saddr), ntohs(th->source), | |
880 | NIP6(ip6h->daddr), ntohs(th->dest)); | |
881 | } | |
882 | return 1; | |
883 | } | |
884 | return 0; | |
885 | } | |
886 | #endif | |
887 | ||
c6aefafb | 888 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 889 | .family = AF_INET6, |
2e6599cb | 890 | .obj_size = sizeof(struct tcp6_request_sock), |
1da177e4 | 891 | .rtx_syn_ack = tcp_v6_send_synack, |
60236fdd ACM |
892 | .send_ack = tcp_v6_reqsk_send_ack, |
893 | .destructor = tcp_v6_reqsk_destructor, | |
1da177e4 LT |
894 | .send_reset = tcp_v6_send_reset |
895 | }; | |
896 | ||
cfb6eeb4 | 897 | #ifdef CONFIG_TCP_MD5SIG |
b6332e6c | 898 | static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 899 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
cfb6eeb4 | 900 | }; |
b6332e6c | 901 | #endif |
cfb6eeb4 | 902 | |
6d6ee43e ACM |
903 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
904 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
905 | .twsk_unique = tcp_twsk_unique, | |
cfb6eeb4 | 906 | .twsk_destructor= tcp_twsk_destructor, |
6d6ee43e ACM |
907 | }; |
908 | ||
8292a17a | 909 | static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) |
1da177e4 LT |
910 | { |
911 | struct ipv6_pinfo *np = inet6_sk(sk); | |
aa8223c7 | 912 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 913 | |
84fa7933 | 914 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1da177e4 | 915 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); |
663ead3b | 916 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 917 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 918 | } else { |
1ab1457c YH |
919 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, |
920 | csum_partial((char *)th, th->doff<<2, | |
1da177e4 LT |
921 | skb->csum)); |
922 | } | |
923 | } | |
924 | ||
a430a43d HX |
925 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
926 | { | |
927 | struct ipv6hdr *ipv6h; | |
928 | struct tcphdr *th; | |
929 | ||
930 | if (!pskb_may_pull(skb, sizeof(*th))) | |
931 | return -EINVAL; | |
932 | ||
0660e03f | 933 | ipv6h = ipv6_hdr(skb); |
aa8223c7 | 934 | th = tcp_hdr(skb); |
a430a43d HX |
935 | |
936 | th->check = 0; | |
937 | th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, | |
938 | IPPROTO_TCP, 0); | |
663ead3b | 939 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 940 | skb->csum_offset = offsetof(struct tcphdr, check); |
84fa7933 | 941 | skb->ip_summed = CHECKSUM_PARTIAL; |
a430a43d HX |
942 | return 0; |
943 | } | |
1da177e4 | 944 | |
626e264d IJ |
945 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
946 | u32 ts, struct tcp_md5sig_key *key, int rst) | |
1da177e4 | 947 | { |
aa8223c7 | 948 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
949 | struct sk_buff *buff; |
950 | struct flowi fl; | |
c346dca1 | 951 | struct net *net = dev_net(skb->dst->dev); |
e5047992 | 952 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 953 | unsigned int tot_len = sizeof(struct tcphdr); |
81ada62d | 954 | __be32 *topt; |
1da177e4 | 955 | |
626e264d IJ |
956 | if (ts) |
957 | tot_len += TCPOLEN_TSTAMP_ALIGNED; | |
cfb6eeb4 | 958 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
959 | if (key) |
960 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
961 | #endif | |
962 | ||
cfb6eeb4 | 963 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 964 | GFP_ATOMIC); |
1ab1457c YH |
965 | if (buff == NULL) |
966 | return; | |
1da177e4 | 967 | |
cfb6eeb4 | 968 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 969 | |
cfb6eeb4 | 970 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
1da177e4 LT |
971 | |
972 | /* Swap the send and the receive. */ | |
973 | memset(t1, 0, sizeof(*t1)); | |
974 | t1->dest = th->source; | |
975 | t1->source = th->dest; | |
cfb6eeb4 | 976 | t1->doff = tot_len / 4; |
626e264d IJ |
977 | t1->seq = htonl(seq); |
978 | t1->ack_seq = htonl(ack); | |
979 | t1->ack = !rst || !th->ack; | |
980 | t1->rst = rst; | |
981 | t1->window = htons(win); | |
1da177e4 | 982 | |
81ada62d IJ |
983 | topt = (__be32 *)(t1 + 1); |
984 | ||
626e264d IJ |
985 | if (ts) { |
986 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
987 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
988 | *topt++ = htonl(tcp_time_stamp); | |
989 | *topt++ = htonl(ts); | |
990 | } | |
991 | ||
cfb6eeb4 YH |
992 | #ifdef CONFIG_TCP_MD5SIG |
993 | if (key) { | |
81ada62d IJ |
994 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
995 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
996 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
997 | &ipv6_hdr(skb)->saddr, |
998 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
999 | } |
1000 | #endif | |
1001 | ||
52cd5750 | 1002 | buff->csum = csum_partial((char *)t1, tot_len, 0); |
1da177e4 LT |
1003 | |
1004 | memset(&fl, 0, sizeof(fl)); | |
0660e03f ACM |
1005 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
1006 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1007 | |
1008 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
52cd5750 | 1009 | tot_len, IPPROTO_TCP, |
1da177e4 LT |
1010 | buff->csum); |
1011 | ||
1012 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 1013 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
1014 | fl.fl_ip_dport = t1->dest; |
1015 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 1016 | security_skb_classify_flow(skb, &fl); |
1da177e4 | 1017 | |
c20121ae DL |
1018 | /* Pass a socket to ip6_dst_lookup either it is for RST |
1019 | * Underlying function will use this to retrieve the network | |
1020 | * namespace | |
1021 | */ | |
e5047992 | 1022 | if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) { |
ecc51b6d | 1023 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
e5047992 | 1024 | ip6_xmit(ctl_sk, buff, &fl, NULL, 0); |
63231bdd | 1025 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
626e264d IJ |
1026 | if (rst) |
1027 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
1da177e4 | 1028 | return; |
ecc51b6d | 1029 | } |
1da177e4 LT |
1030 | } |
1031 | ||
1032 | kfree_skb(buff); | |
1033 | } | |
1034 | ||
626e264d | 1035 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1036 | { |
626e264d IJ |
1037 | struct tcphdr *th = tcp_hdr(skb); |
1038 | u32 seq = 0, ack_seq = 0; | |
fa3e5b4e | 1039 | struct tcp_md5sig_key *key = NULL; |
1da177e4 | 1040 | |
626e264d | 1041 | if (th->rst) |
1da177e4 LT |
1042 | return; |
1043 | ||
626e264d IJ |
1044 | if (!ipv6_unicast_destination(skb)) |
1045 | return; | |
1da177e4 | 1046 | |
cfb6eeb4 | 1047 | #ifdef CONFIG_TCP_MD5SIG |
626e264d IJ |
1048 | if (sk) |
1049 | key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr); | |
cfb6eeb4 YH |
1050 | #endif |
1051 | ||
626e264d IJ |
1052 | if (th->ack) |
1053 | seq = ntohl(th->ack_seq); | |
1054 | else | |
1055 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
1056 | (th->doff << 2); | |
1da177e4 | 1057 | |
626e264d IJ |
1058 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1); |
1059 | } | |
1da177e4 | 1060 | |
626e264d IJ |
1061 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts, |
1062 | struct tcp_md5sig_key *key) | |
1063 | { | |
1064 | tcp_v6_send_response(skb, seq, ack, win, ts, key, 0); | |
1da177e4 LT |
1065 | } |
1066 | ||
1067 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1068 | { | |
8feaf0c0 | 1069 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 1070 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 1071 | |
9501f972 | 1072 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 1073 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
9501f972 | 1074 | tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw)); |
1da177e4 | 1075 | |
8feaf0c0 | 1076 | inet_twsk_put(tw); |
1da177e4 LT |
1077 | } |
1078 | ||
6edafaaf GJ |
1079 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
1080 | struct request_sock *req) | |
1da177e4 | 1081 | { |
9501f972 | 1082 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent, |
6edafaaf | 1083 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr)); |
1da177e4 LT |
1084 | } |
1085 | ||
1086 | ||
1087 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
1088 | { | |
60236fdd | 1089 | struct request_sock *req, **prev; |
aa8223c7 | 1090 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
1091 | struct sock *nsk; |
1092 | ||
1093 | /* Find possible connection requests. */ | |
8129765a | 1094 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
1095 | &ipv6_hdr(skb)->saddr, |
1096 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 LT |
1097 | if (req) |
1098 | return tcp_check_req(sk, skb, req, prev); | |
1099 | ||
3b1e0a65 | 1100 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
1101 | &ipv6_hdr(skb)->saddr, th->source, |
1102 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
1103 | |
1104 | if (nsk) { | |
1105 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1106 | bh_lock_sock(nsk); | |
1107 | return nsk; | |
1108 | } | |
9469c7b4 | 1109 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1110 | return NULL; |
1111 | } | |
1112 | ||
c6aefafb | 1113 | #ifdef CONFIG_SYN_COOKIES |
1da177e4 | 1114 | if (!th->rst && !th->syn && th->ack) |
c6aefafb | 1115 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1116 | #endif |
1117 | return sk; | |
1118 | } | |
1119 | ||
1da177e4 LT |
1120 | /* FIXME: this is substantially similar to the ipv4 code. |
1121 | * Can some kind of merge be done? -- erics | |
1122 | */ | |
1123 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1124 | { | |
ca304b61 | 1125 | struct inet6_request_sock *treq; |
1da177e4 LT |
1126 | struct ipv6_pinfo *np = inet6_sk(sk); |
1127 | struct tcp_options_received tmp_opt; | |
1128 | struct tcp_sock *tp = tcp_sk(sk); | |
60236fdd | 1129 | struct request_sock *req = NULL; |
1da177e4 | 1130 | __u32 isn = TCP_SKB_CB(skb)->when; |
c6aefafb GG |
1131 | #ifdef CONFIG_SYN_COOKIES |
1132 | int want_cookie = 0; | |
1133 | #else | |
1134 | #define want_cookie 0 | |
1135 | #endif | |
1da177e4 LT |
1136 | |
1137 | if (skb->protocol == htons(ETH_P_IP)) | |
1138 | return tcp_v4_conn_request(sk, skb); | |
1139 | ||
1140 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1141 | goto drop; |
1da177e4 | 1142 | |
463c84b9 | 1143 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 | 1144 | if (net_ratelimit()) |
c6aefafb GG |
1145 | syn_flood_warning(skb); |
1146 | #ifdef CONFIG_SYN_COOKIES | |
1147 | if (sysctl_tcp_syncookies) | |
1148 | want_cookie = 1; | |
1149 | else | |
1150 | #endif | |
1ab1457c | 1151 | goto drop; |
1da177e4 LT |
1152 | } |
1153 | ||
463c84b9 | 1154 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1155 | goto drop; |
1156 | ||
ca304b61 | 1157 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1158 | if (req == NULL) |
1159 | goto drop; | |
1160 | ||
cfb6eeb4 YH |
1161 | #ifdef CONFIG_TCP_MD5SIG |
1162 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
1163 | #endif | |
1164 | ||
1da177e4 LT |
1165 | tcp_clear_options(&tmp_opt); |
1166 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1167 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
1168 | ||
1169 | tcp_parse_options(skb, &tmp_opt, 0); | |
1170 | ||
4dfc2817 | 1171 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 1172 | tcp_clear_options(&tmp_opt); |
c6aefafb | 1173 | |
1da177e4 LT |
1174 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1175 | tcp_openreq_init(req, &tmp_opt, skb); | |
1176 | ||
ca304b61 | 1177 | treq = inet6_rsk(req); |
0660e03f ACM |
1178 | ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr); |
1179 | ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr); | |
c6aefafb GG |
1180 | if (!want_cookie) |
1181 | TCP_ECN_create_request(req, tcp_hdr(skb)); | |
1182 | ||
1183 | if (want_cookie) { | |
1184 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); | |
4dfc2817 | 1185 | req->cookie_ts = tmp_opt.tstamp_ok; |
c6aefafb GG |
1186 | } else if (!isn) { |
1187 | if (ipv6_opt_accepted(sk, skb) || | |
1188 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1189 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1190 | atomic_inc(&skb->users); | |
1191 | treq->pktopts = skb; | |
1192 | } | |
1193 | treq->iif = sk->sk_bound_dev_if; | |
1da177e4 | 1194 | |
c6aefafb GG |
1195 | /* So that link locals have meaning */ |
1196 | if (!sk->sk_bound_dev_if && | |
1197 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1198 | treq->iif = inet6_iif(skb); | |
1da177e4 | 1199 | |
a94f723d | 1200 | isn = tcp_v6_init_sequence(skb); |
c6aefafb | 1201 | } |
1da177e4 | 1202 | |
2e6599cb | 1203 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1204 | |
4237c75c VY |
1205 | security_inet_conn_request(sk, skb, req); |
1206 | ||
fd80eb94 | 1207 | if (tcp_v6_send_synack(sk, req)) |
1da177e4 LT |
1208 | goto drop; |
1209 | ||
c6aefafb GG |
1210 | if (!want_cookie) { |
1211 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); | |
1212 | return 0; | |
1213 | } | |
1da177e4 LT |
1214 | |
1215 | drop: | |
1216 | if (req) | |
60236fdd | 1217 | reqsk_free(req); |
1da177e4 | 1218 | |
1da177e4 LT |
1219 | return 0; /* don't send reset */ |
1220 | } | |
1221 | ||
1222 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1223 | struct request_sock *req, |
1da177e4 LT |
1224 | struct dst_entry *dst) |
1225 | { | |
78d15e82 | 1226 | struct inet6_request_sock *treq; |
1da177e4 LT |
1227 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1228 | struct tcp6_sock *newtcp6sk; | |
1229 | struct inet_sock *newinet; | |
1230 | struct tcp_sock *newtp; | |
1231 | struct sock *newsk; | |
1232 | struct ipv6_txoptions *opt; | |
cfb6eeb4 YH |
1233 | #ifdef CONFIG_TCP_MD5SIG |
1234 | struct tcp_md5sig_key *key; | |
1235 | #endif | |
1da177e4 LT |
1236 | |
1237 | if (skb->protocol == htons(ETH_P_IP)) { | |
1238 | /* | |
1239 | * v6 mapped | |
1240 | */ | |
1241 | ||
1242 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1243 | ||
1ab1457c | 1244 | if (newsk == NULL) |
1da177e4 LT |
1245 | return NULL; |
1246 | ||
1247 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1248 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1249 | ||
1250 | newinet = inet_sk(newsk); | |
1251 | newnp = inet6_sk(newsk); | |
1252 | newtp = tcp_sk(newsk); | |
1253 | ||
1254 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1255 | ||
1256 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
1257 | newinet->daddr); | |
1258 | ||
1259 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
1260 | newinet->saddr); | |
1261 | ||
1262 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1263 | ||
8292a17a | 1264 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1265 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1266 | #ifdef CONFIG_TCP_MD5SIG |
1267 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1268 | #endif | |
1269 | ||
1da177e4 LT |
1270 | newnp->pktoptions = NULL; |
1271 | newnp->opt = NULL; | |
505cbfc5 | 1272 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1273 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 | 1274 | |
e6848976 ACM |
1275 | /* |
1276 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1277 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1278 | * that function for the gory details. -acme | |
1da177e4 | 1279 | */ |
1da177e4 LT |
1280 | |
1281 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1282 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1283 | Sync it now. |
1284 | */ | |
d83d8461 | 1285 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1286 | |
1287 | return newsk; | |
1288 | } | |
1289 | ||
78d15e82 | 1290 | treq = inet6_rsk(req); |
1da177e4 LT |
1291 | opt = np->opt; |
1292 | ||
1293 | if (sk_acceptq_is_full(sk)) | |
1294 | goto out_overflow; | |
1295 | ||
1da177e4 LT |
1296 | if (dst == NULL) { |
1297 | struct in6_addr *final_p = NULL, final; | |
1298 | struct flowi fl; | |
1299 | ||
1300 | memset(&fl, 0, sizeof(fl)); | |
1301 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1302 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
1303 | if (opt && opt->srcrt) { |
1304 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1305 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1306 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1307 | final_p = &final; | |
1308 | } | |
2e6599cb | 1309 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1310 | fl.oif = sk->sk_bound_dev_if; |
2e6599cb | 1311 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
fd507037 | 1312 | fl.fl_ip_sport = inet_rsk(req)->loc_port; |
4237c75c | 1313 | security_req_classify_flow(req, &fl); |
1da177e4 LT |
1314 | |
1315 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1316 | goto out; | |
1317 | ||
1318 | if (final_p) | |
1319 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1320 | ||
1321 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
1322 | goto out; | |
1ab1457c | 1323 | } |
1da177e4 LT |
1324 | |
1325 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1326 | if (newsk == NULL) | |
1327 | goto out; | |
1328 | ||
e6848976 ACM |
1329 | /* |
1330 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1331 | * count here, tcp_create_openreq_child now does this for us, see the | |
1332 | * comment in that function for the gory details. -acme | |
1333 | */ | |
1da177e4 | 1334 | |
59eed279 | 1335 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1336 | __ip6_dst_store(newsk, dst, NULL, NULL); |
1da177e4 LT |
1337 | |
1338 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1339 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1340 | ||
1341 | newtp = tcp_sk(newsk); | |
1342 | newinet = inet_sk(newsk); | |
1343 | newnp = inet6_sk(newsk); | |
1344 | ||
1345 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1346 | ||
2e6599cb ACM |
1347 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1348 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1349 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1350 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 | 1351 | |
1ab1457c | 1352 | /* Now IPv6 options... |
1da177e4 LT |
1353 | |
1354 | First: no IPv4 options. | |
1355 | */ | |
1356 | newinet->opt = NULL; | |
d35690be | 1357 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1358 | |
1359 | /* Clone RX bits */ | |
1360 | newnp->rxopt.all = np->rxopt.all; | |
1361 | ||
1362 | /* Clone pktoptions received with SYN */ | |
1363 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1364 | if (treq->pktopts != NULL) { |
1365 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1366 | kfree_skb(treq->pktopts); | |
1367 | treq->pktopts = NULL; | |
1da177e4 LT |
1368 | if (newnp->pktoptions) |
1369 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1370 | } | |
1371 | newnp->opt = NULL; | |
505cbfc5 | 1372 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1373 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
1374 | |
1375 | /* Clone native IPv6 options from listening socket (if any) | |
1376 | ||
1377 | Yes, keeping reference count would be much more clever, | |
1378 | but we make one more one thing there: reattach optmem | |
1379 | to newsk. | |
1380 | */ | |
1381 | if (opt) { | |
1382 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1383 | if (opt != np->opt) | |
1384 | sock_kfree_s(sk, opt, opt->tot_len); | |
1385 | } | |
1386 | ||
d83d8461 | 1387 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1388 | if (newnp->opt) |
d83d8461 ACM |
1389 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1390 | newnp->opt->opt_flen); | |
1da177e4 | 1391 | |
5d424d5a | 1392 | tcp_mtup_init(newsk); |
1da177e4 LT |
1393 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1394 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1395 | tcp_initialize_rcv_mss(newsk); | |
1396 | ||
1397 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
1398 | ||
cfb6eeb4 YH |
1399 | #ifdef CONFIG_TCP_MD5SIG |
1400 | /* Copy over the MD5 key from the original socket */ | |
1401 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1402 | /* We're using one, so create a matching key | |
1403 | * on the newsk structure. If we fail to get | |
1404 | * memory, then we end up not copying the key | |
1405 | * across. Shucks. | |
1406 | */ | |
af879cc7 ACM |
1407 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1408 | if (newkey != NULL) | |
cfb6eeb4 YH |
1409 | tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr, |
1410 | newkey, key->keylen); | |
cfb6eeb4 YH |
1411 | } |
1412 | #endif | |
1413 | ||
ab1e0a13 | 1414 | __inet6_hash(newsk); |
e56d8b8a | 1415 | __inet_inherit_port(sk, newsk); |
1da177e4 LT |
1416 | |
1417 | return newsk; | |
1418 | ||
1419 | out_overflow: | |
de0744af | 1420 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
1da177e4 | 1421 | out: |
de0744af | 1422 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1423 | if (opt && opt != np->opt) |
1424 | sock_kfree_s(sk, opt, opt->tot_len); | |
1425 | dst_release(dst); | |
1426 | return NULL; | |
1427 | } | |
1428 | ||
b51655b9 | 1429 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1430 | { |
84fa7933 | 1431 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
aa8223c7 | 1432 | if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1433 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1434 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1435 | return 0; |
fb286bb2 | 1436 | } |
1da177e4 | 1437 | } |
fb286bb2 | 1438 | |
aa8223c7 | 1439 | skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len, |
0660e03f ACM |
1440 | &ipv6_hdr(skb)->saddr, |
1441 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1442 | |
1da177e4 | 1443 | if (skb->len <= 76) { |
fb286bb2 | 1444 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1445 | } |
1446 | return 0; | |
1447 | } | |
1448 | ||
1449 | /* The socket must have it's spinlock held when we get | |
1450 | * here. | |
1451 | * | |
1452 | * We have a potential double-lock case here, so even when | |
1453 | * doing backlog processing we use the BH locking scheme. | |
1454 | * This is because we cannot sleep with the original spinlock | |
1455 | * held. | |
1456 | */ | |
1457 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1458 | { | |
1459 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1460 | struct tcp_sock *tp; | |
1461 | struct sk_buff *opt_skb = NULL; | |
1462 | ||
1463 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1464 | goes to IPv4 receive handler and backlogged. | |
1465 | From backlog it always goes here. Kerboom... | |
1466 | Fortunately, tcp_rcv_established and rcv_established | |
1467 | handle them correctly, but it is not case with | |
1468 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1469 | */ | |
1470 | ||
1471 | if (skb->protocol == htons(ETH_P_IP)) | |
1472 | return tcp_v4_do_rcv(sk, skb); | |
1473 | ||
cfb6eeb4 YH |
1474 | #ifdef CONFIG_TCP_MD5SIG |
1475 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1476 | goto discard; | |
1477 | #endif | |
1478 | ||
fda9ef5d | 1479 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1480 | goto discard; |
1481 | ||
1482 | /* | |
1483 | * socket locking is here for SMP purposes as backlog rcv | |
1484 | * is currently called with bh processing disabled. | |
1485 | */ | |
1486 | ||
1487 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1488 | ||
1489 | Yes, guys, it is the only place in our code, where we | |
1490 | may make it not affecting IPv4. | |
1491 | The rest of code is protocol independent, | |
1492 | and I do not like idea to uglify IPv4. | |
1493 | ||
1494 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1495 | looks not very well thought. For now we latch | |
1496 | options, received in the last packet, enqueued | |
1497 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1498 | --ANK (980728) |
1da177e4 LT |
1499 | */ |
1500 | if (np->rxopt.all) | |
1501 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1502 | ||
1503 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1504 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1505 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1506 | goto reset; |
1507 | TCP_CHECK_TIMER(sk); | |
1508 | if (opt_skb) | |
1509 | goto ipv6_pktoptions; | |
1510 | return 0; | |
1511 | } | |
1512 | ||
ab6a5bb6 | 1513 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1514 | goto csum_err; |
1515 | ||
1ab1457c | 1516 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1517 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1518 | if (!nsk) | |
1519 | goto discard; | |
1520 | ||
1521 | /* | |
1522 | * Queue it on the new socket if the new socket is active, | |
1523 | * otherwise we just shortcircuit this and continue with | |
1524 | * the new socket.. | |
1525 | */ | |
1ab1457c | 1526 | if(nsk != sk) { |
1da177e4 LT |
1527 | if (tcp_child_process(sk, nsk, skb)) |
1528 | goto reset; | |
1529 | if (opt_skb) | |
1530 | __kfree_skb(opt_skb); | |
1531 | return 0; | |
1532 | } | |
1533 | } | |
1534 | ||
1535 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1536 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1537 | goto reset; |
1538 | TCP_CHECK_TIMER(sk); | |
1539 | if (opt_skb) | |
1540 | goto ipv6_pktoptions; | |
1541 | return 0; | |
1542 | ||
1543 | reset: | |
cfb6eeb4 | 1544 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1545 | discard: |
1546 | if (opt_skb) | |
1547 | __kfree_skb(opt_skb); | |
1548 | kfree_skb(skb); | |
1549 | return 0; | |
1550 | csum_err: | |
63231bdd | 1551 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1552 | goto discard; |
1553 | ||
1554 | ||
1555 | ipv6_pktoptions: | |
1556 | /* Do you ask, what is it? | |
1557 | ||
1558 | 1. skb was enqueued by tcp. | |
1559 | 2. skb is added to tail of read queue, rather than out of order. | |
1560 | 3. socket is not in passive state. | |
1561 | 4. Finally, it really contains options, which user wants to receive. | |
1562 | */ | |
1563 | tp = tcp_sk(sk); | |
1564 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1565 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1566 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1567 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1568 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1569 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
1da177e4 LT |
1570 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1571 | skb_set_owner_r(opt_skb, sk); | |
1572 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1573 | } else { | |
1574 | __kfree_skb(opt_skb); | |
1575 | opt_skb = xchg(&np->pktoptions, NULL); | |
1576 | } | |
1577 | } | |
1578 | ||
1579 | if (opt_skb) | |
1580 | kfree_skb(opt_skb); | |
1581 | return 0; | |
1582 | } | |
1583 | ||
e5bbef20 | 1584 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1585 | { |
1ab1457c | 1586 | struct tcphdr *th; |
1da177e4 LT |
1587 | struct sock *sk; |
1588 | int ret; | |
a86b1e30 | 1589 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1590 | |
1591 | if (skb->pkt_type != PACKET_HOST) | |
1592 | goto discard_it; | |
1593 | ||
1594 | /* | |
1595 | * Count it even if it's bad. | |
1596 | */ | |
63231bdd | 1597 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1598 | |
1599 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1600 | goto discard_it; | |
1601 | ||
aa8223c7 | 1602 | th = tcp_hdr(skb); |
1da177e4 LT |
1603 | |
1604 | if (th->doff < sizeof(struct tcphdr)/4) | |
1605 | goto bad_packet; | |
1606 | if (!pskb_may_pull(skb, th->doff*4)) | |
1607 | goto discard_it; | |
1608 | ||
60476372 | 1609 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1da177e4 LT |
1610 | goto bad_packet; |
1611 | ||
aa8223c7 | 1612 | th = tcp_hdr(skb); |
1da177e4 LT |
1613 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1614 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1615 | skb->len - th->doff*4); | |
1616 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1617 | TCP_SKB_CB(skb)->when = 0; | |
0660e03f | 1618 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 LT |
1619 | TCP_SKB_CB(skb)->sacked = 0; |
1620 | ||
9a1f27c4 | 1621 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1622 | if (!sk) |
1623 | goto no_tcp_socket; | |
1624 | ||
1625 | process: | |
1626 | if (sk->sk_state == TCP_TIME_WAIT) | |
1627 | goto do_time_wait; | |
1628 | ||
1629 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1630 | goto discard_and_relse; | |
1631 | ||
fda9ef5d | 1632 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1633 | goto discard_and_relse; |
1634 | ||
1635 | skb->dev = NULL; | |
1636 | ||
293b9c42 | 1637 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1638 | ret = 0; |
1639 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1640 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1641 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a DM |
1642 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
1643 | tp->ucopy.dma_chan = get_softnet_dma(); | |
1ab1457c YH |
1644 | if (tp->ucopy.dma_chan) |
1645 | ret = tcp_v6_do_rcv(sk, skb); | |
1646 | else | |
1a2449a8 CL |
1647 | #endif |
1648 | { | |
1649 | if (!tcp_prequeue(sk, skb)) | |
1650 | ret = tcp_v6_do_rcv(sk, skb); | |
1651 | } | |
1da177e4 LT |
1652 | } else |
1653 | sk_add_backlog(sk, skb); | |
1654 | bh_unlock_sock(sk); | |
1655 | ||
1656 | sock_put(sk); | |
1657 | return ret ? -1 : 0; | |
1658 | ||
1659 | no_tcp_socket: | |
1660 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1661 | goto discard_it; | |
1662 | ||
1663 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1664 | bad_packet: | |
63231bdd | 1665 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1666 | } else { |
cfb6eeb4 | 1667 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1668 | } |
1669 | ||
1670 | discard_it: | |
1671 | ||
1672 | /* | |
1673 | * Discard frame | |
1674 | */ | |
1675 | ||
1676 | kfree_skb(skb); | |
1677 | return 0; | |
1678 | ||
1679 | discard_and_relse: | |
1680 | sock_put(sk); | |
1681 | goto discard_it; | |
1682 | ||
1683 | do_time_wait: | |
1684 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1685 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1686 | goto discard_it; |
1687 | } | |
1688 | ||
1689 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
63231bdd | 1690 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
9469c7b4 | 1691 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1692 | goto discard_it; |
1693 | } | |
1694 | ||
9469c7b4 | 1695 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1696 | case TCP_TW_SYN: |
1697 | { | |
1698 | struct sock *sk2; | |
1699 | ||
c346dca1 | 1700 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
0660e03f | 1701 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1702 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1703 | if (sk2 != NULL) { |
295ff7ed ACM |
1704 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1705 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1706 | inet_twsk_put(tw); | |
1da177e4 LT |
1707 | sk = sk2; |
1708 | goto process; | |
1709 | } | |
1710 | /* Fall through to ACK */ | |
1711 | } | |
1712 | case TCP_TW_ACK: | |
1713 | tcp_v6_timewait_ack(sk, skb); | |
1714 | break; | |
1715 | case TCP_TW_RST: | |
1716 | goto no_tcp_socket; | |
1717 | case TCP_TW_SUCCESS:; | |
1718 | } | |
1719 | goto discard_it; | |
1720 | } | |
1721 | ||
1da177e4 LT |
1722 | static int tcp_v6_remember_stamp(struct sock *sk) |
1723 | { | |
1724 | /* Alas, not yet... */ | |
1725 | return 0; | |
1726 | } | |
1727 | ||
8292a17a | 1728 | static struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1729 | .queue_xmit = inet6_csk_xmit, |
1730 | .send_check = tcp_v6_send_check, | |
1731 | .rebuild_header = inet6_sk_rebuild_header, | |
1732 | .conn_request = tcp_v6_conn_request, | |
1733 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1734 | .remember_stamp = tcp_v6_remember_stamp, | |
1735 | .net_header_len = sizeof(struct ipv6hdr), | |
1736 | .setsockopt = ipv6_setsockopt, | |
1737 | .getsockopt = ipv6_getsockopt, | |
1738 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1739 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1740 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1741 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1742 | .compat_setsockopt = compat_ipv6_setsockopt, |
1743 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1744 | #endif |
1da177e4 LT |
1745 | }; |
1746 | ||
cfb6eeb4 | 1747 | #ifdef CONFIG_TCP_MD5SIG |
a928630a | 1748 | static struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1749 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1750 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 YH |
1751 | .md5_add = tcp_v6_md5_add_func, |
1752 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1753 | }; |
a928630a | 1754 | #endif |
cfb6eeb4 | 1755 | |
1da177e4 LT |
1756 | /* |
1757 | * TCP over IPv4 via INET6 API | |
1758 | */ | |
1759 | ||
8292a17a | 1760 | static struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1761 | .queue_xmit = ip_queue_xmit, |
1762 | .send_check = tcp_v4_send_check, | |
1763 | .rebuild_header = inet_sk_rebuild_header, | |
1764 | .conn_request = tcp_v6_conn_request, | |
1765 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1766 | .remember_stamp = tcp_v4_remember_stamp, | |
1767 | .net_header_len = sizeof(struct iphdr), | |
1768 | .setsockopt = ipv6_setsockopt, | |
1769 | .getsockopt = ipv6_getsockopt, | |
1770 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1771 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1772 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1773 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1774 | .compat_setsockopt = compat_ipv6_setsockopt, |
1775 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1776 | #endif |
1da177e4 LT |
1777 | }; |
1778 | ||
cfb6eeb4 | 1779 | #ifdef CONFIG_TCP_MD5SIG |
a928630a | 1780 | static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1781 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1782 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 YH |
1783 | .md5_add = tcp_v6_md5_add_func, |
1784 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1785 | }; |
a928630a | 1786 | #endif |
cfb6eeb4 | 1787 | |
1da177e4 LT |
1788 | /* NOTE: A lot of things set to zero explicitly by call to |
1789 | * sk_alloc() so need not be done here. | |
1790 | */ | |
1791 | static int tcp_v6_init_sock(struct sock *sk) | |
1792 | { | |
6687e988 | 1793 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1794 | struct tcp_sock *tp = tcp_sk(sk); |
1795 | ||
1796 | skb_queue_head_init(&tp->out_of_order_queue); | |
1797 | tcp_init_xmit_timers(sk); | |
1798 | tcp_prequeue_init(tp); | |
1799 | ||
6687e988 | 1800 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1801 | tp->mdev = TCP_TIMEOUT_INIT; |
1802 | ||
1803 | /* So many TCP implementations out there (incorrectly) count the | |
1804 | * initial SYN frame in their delayed-ACK and congestion control | |
1805 | * algorithms that we must have the following bandaid to talk | |
1806 | * efficiently to them. -DaveM | |
1807 | */ | |
1808 | tp->snd_cwnd = 2; | |
1809 | ||
1810 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1811 | * initialization of these values. | |
1812 | */ | |
1813 | tp->snd_ssthresh = 0x7fffffff; | |
1814 | tp->snd_cwnd_clamp = ~0; | |
c1b4a7e6 | 1815 | tp->mss_cache = 536; |
1da177e4 LT |
1816 | |
1817 | tp->reordering = sysctl_tcp_reordering; | |
1818 | ||
1819 | sk->sk_state = TCP_CLOSE; | |
1820 | ||
8292a17a | 1821 | icsk->icsk_af_ops = &ipv6_specific; |
6687e988 | 1822 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
d83d8461 | 1823 | icsk->icsk_sync_mss = tcp_sync_mss; |
1da177e4 LT |
1824 | sk->sk_write_space = sk_stream_write_space; |
1825 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1826 | ||
cfb6eeb4 YH |
1827 | #ifdef CONFIG_TCP_MD5SIG |
1828 | tp->af_specific = &tcp_sock_ipv6_specific; | |
1829 | #endif | |
1830 | ||
1da177e4 LT |
1831 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
1832 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1833 | ||
1834 | atomic_inc(&tcp_sockets_allocated); | |
1835 | ||
1836 | return 0; | |
1837 | } | |
1838 | ||
7d06b2e0 | 1839 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1840 | { |
cfb6eeb4 YH |
1841 | #ifdef CONFIG_TCP_MD5SIG |
1842 | /* Clean up the MD5 key list */ | |
1843 | if (tcp_sk(sk)->md5sig_info) | |
1844 | tcp_v6_clear_md5_list(sk); | |
1845 | #endif | |
1da177e4 | 1846 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1847 | inet6_destroy_sock(sk); |
1da177e4 LT |
1848 | } |
1849 | ||
952a10be | 1850 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1851 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1852 | static void get_openreq6(struct seq_file *seq, |
60236fdd | 1853 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 1854 | { |
1da177e4 | 1855 | int ttd = req->expires - jiffies; |
ca304b61 ACM |
1856 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1857 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1858 | |
1859 | if (ttd < 0) | |
1860 | ttd = 0; | |
1861 | ||
1da177e4 LT |
1862 | seq_printf(seq, |
1863 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1864 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1865 | i, | |
1866 | src->s6_addr32[0], src->s6_addr32[1], | |
1867 | src->s6_addr32[2], src->s6_addr32[3], | |
fd507037 | 1868 | ntohs(inet_rsk(req)->loc_port), |
1da177e4 LT |
1869 | dest->s6_addr32[0], dest->s6_addr32[1], |
1870 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1871 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1872 | TCP_SYN_RECV, |
1873 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
1874 | 1, /* timers active (only the expire timer) */ |
1875 | jiffies_to_clock_t(ttd), | |
1da177e4 LT |
1876 | req->retrans, |
1877 | uid, | |
1ab1457c | 1878 | 0, /* non standard timer */ |
1da177e4 LT |
1879 | 0, /* open_requests have no inode */ |
1880 | 0, req); | |
1881 | } | |
1882 | ||
1883 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1884 | { | |
1885 | struct in6_addr *dest, *src; | |
1886 | __u16 destp, srcp; | |
1887 | int timer_active; | |
1888 | unsigned long timer_expires; | |
1889 | struct inet_sock *inet = inet_sk(sp); | |
1890 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1891 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
1892 | struct ipv6_pinfo *np = inet6_sk(sp); |
1893 | ||
1894 | dest = &np->daddr; | |
1895 | src = &np->rcv_saddr; | |
1896 | destp = ntohs(inet->dport); | |
1897 | srcp = ntohs(inet->sport); | |
463c84b9 ACM |
1898 | |
1899 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1900 | timer_active = 1; |
463c84b9 ACM |
1901 | timer_expires = icsk->icsk_timeout; |
1902 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1903 | timer_active = 4; |
463c84b9 | 1904 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1905 | } else if (timer_pending(&sp->sk_timer)) { |
1906 | timer_active = 2; | |
1907 | timer_expires = sp->sk_timer.expires; | |
1908 | } else { | |
1909 | timer_active = 0; | |
1910 | timer_expires = jiffies; | |
1911 | } | |
1912 | ||
1913 | seq_printf(seq, | |
1914 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
7be87351 | 1915 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n", |
1da177e4 LT |
1916 | i, |
1917 | src->s6_addr32[0], src->s6_addr32[1], | |
1918 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1919 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1920 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1921 | sp->sk_state, |
47da8ee6 SS |
1922 | tp->write_seq-tp->snd_una, |
1923 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 LT |
1924 | timer_active, |
1925 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 1926 | icsk->icsk_retransmits, |
1da177e4 | 1927 | sock_i_uid(sp), |
6687e988 | 1928 | icsk->icsk_probes_out, |
1da177e4 LT |
1929 | sock_i_ino(sp), |
1930 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1931 | jiffies_to_clock_t(icsk->icsk_rto), |
1932 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 1933 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
1da177e4 LT |
1934 | tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh |
1935 | ); | |
1936 | } | |
1937 | ||
1ab1457c | 1938 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1939 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
1940 | { |
1941 | struct in6_addr *dest, *src; | |
1942 | __u16 destp, srcp; | |
0fa1a53e | 1943 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
1944 | int ttd = tw->tw_ttd - jiffies; |
1945 | ||
1946 | if (ttd < 0) | |
1947 | ttd = 0; | |
1948 | ||
0fa1a53e ACM |
1949 | dest = &tw6->tw_v6_daddr; |
1950 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
1951 | destp = ntohs(tw->tw_dport); |
1952 | srcp = ntohs(tw->tw_sport); | |
1953 | ||
1954 | seq_printf(seq, | |
1955 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1956 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1957 | i, | |
1958 | src->s6_addr32[0], src->s6_addr32[1], | |
1959 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1960 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1961 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1962 | tw->tw_substate, 0, 0, | |
1963 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
1964 | atomic_read(&tw->tw_refcnt), tw); | |
1965 | } | |
1966 | ||
1da177e4 LT |
1967 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1968 | { | |
1969 | struct tcp_iter_state *st; | |
1970 | ||
1971 | if (v == SEQ_START_TOKEN) { | |
1972 | seq_puts(seq, | |
1973 | " sl " | |
1974 | "local_address " | |
1975 | "remote_address " | |
1976 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1977 | " uid timeout inode\n"); | |
1978 | goto out; | |
1979 | } | |
1980 | st = seq->private; | |
1981 | ||
1982 | switch (st->state) { | |
1983 | case TCP_SEQ_STATE_LISTENING: | |
1984 | case TCP_SEQ_STATE_ESTABLISHED: | |
1985 | get_tcp6_sock(seq, v, st->num); | |
1986 | break; | |
1987 | case TCP_SEQ_STATE_OPENREQ: | |
1988 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
1989 | break; | |
1990 | case TCP_SEQ_STATE_TIME_WAIT: | |
1991 | get_timewait6_sock(seq, v, st->num); | |
1992 | break; | |
1993 | } | |
1994 | out: | |
1995 | return 0; | |
1996 | } | |
1997 | ||
1da177e4 | 1998 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1999 | .name = "tcp6", |
2000 | .family = AF_INET6, | |
5f4472c5 DL |
2001 | .seq_fops = { |
2002 | .owner = THIS_MODULE, | |
2003 | }, | |
9427c4b3 DL |
2004 | .seq_ops = { |
2005 | .show = tcp6_seq_show, | |
2006 | }, | |
1da177e4 LT |
2007 | }; |
2008 | ||
6f8b13bc | 2009 | int tcp6_proc_init(struct net *net) |
1da177e4 | 2010 | { |
6f8b13bc | 2011 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2012 | } |
2013 | ||
6f8b13bc | 2014 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2015 | { |
6f8b13bc | 2016 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2017 | } |
2018 | #endif | |
2019 | ||
2020 | struct proto tcpv6_prot = { | |
2021 | .name = "TCPv6", | |
2022 | .owner = THIS_MODULE, | |
2023 | .close = tcp_close, | |
2024 | .connect = tcp_v6_connect, | |
2025 | .disconnect = tcp_disconnect, | |
463c84b9 | 2026 | .accept = inet_csk_accept, |
1da177e4 LT |
2027 | .ioctl = tcp_ioctl, |
2028 | .init = tcp_v6_init_sock, | |
2029 | .destroy = tcp_v6_destroy_sock, | |
2030 | .shutdown = tcp_shutdown, | |
2031 | .setsockopt = tcp_setsockopt, | |
2032 | .getsockopt = tcp_getsockopt, | |
1da177e4 LT |
2033 | .recvmsg = tcp_recvmsg, |
2034 | .backlog_rcv = tcp_v6_do_rcv, | |
2035 | .hash = tcp_v6_hash, | |
ab1e0a13 ACM |
2036 | .unhash = inet_unhash, |
2037 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2038 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2039 | .sockets_allocated = &tcp_sockets_allocated, | |
2040 | .memory_allocated = &tcp_memory_allocated, | |
2041 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2042 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2043 | .sysctl_mem = sysctl_tcp_mem, |
2044 | .sysctl_wmem = sysctl_tcp_wmem, | |
2045 | .sysctl_rmem = sysctl_tcp_rmem, | |
2046 | .max_header = MAX_TCP_HEADER, | |
2047 | .obj_size = sizeof(struct tcp6_sock), | |
6d6ee43e | 2048 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2049 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2050 | .h.hashinfo = &tcp_hashinfo, |
543d9cfe ACM |
2051 | #ifdef CONFIG_COMPAT |
2052 | .compat_setsockopt = compat_tcp_setsockopt, | |
2053 | .compat_getsockopt = compat_tcp_getsockopt, | |
2054 | #endif | |
1da177e4 LT |
2055 | }; |
2056 | ||
2057 | static struct inet6_protocol tcpv6_protocol = { | |
2058 | .handler = tcp_v6_rcv, | |
2059 | .err_handler = tcp_v6_err, | |
a430a43d | 2060 | .gso_send_check = tcp_v6_gso_send_check, |
adcfc7d0 | 2061 | .gso_segment = tcp_tso_segment, |
1da177e4 LT |
2062 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
2063 | }; | |
2064 | ||
1da177e4 LT |
2065 | static struct inet_protosw tcpv6_protosw = { |
2066 | .type = SOCK_STREAM, | |
2067 | .protocol = IPPROTO_TCP, | |
2068 | .prot = &tcpv6_prot, | |
2069 | .ops = &inet6_stream_ops, | |
2070 | .capability = -1, | |
2071 | .no_check = 0, | |
d83d8461 ACM |
2072 | .flags = INET_PROTOSW_PERMANENT | |
2073 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2074 | }; |
2075 | ||
93ec926b DL |
2076 | static int tcpv6_net_init(struct net *net) |
2077 | { | |
5677242f DL |
2078 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2079 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2080 | } |
2081 | ||
2082 | static void tcpv6_net_exit(struct net *net) | |
2083 | { | |
5677242f | 2084 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
d315492b | 2085 | inet_twsk_purge(net, &tcp_hashinfo, &tcp_death_row, AF_INET6); |
93ec926b DL |
2086 | } |
2087 | ||
2088 | static struct pernet_operations tcpv6_net_ops = { | |
2089 | .init = tcpv6_net_init, | |
2090 | .exit = tcpv6_net_exit, | |
2091 | }; | |
2092 | ||
7f4e4868 | 2093 | int __init tcpv6_init(void) |
1da177e4 | 2094 | { |
7f4e4868 DL |
2095 | int ret; |
2096 | ||
2097 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2098 | if (ret) | |
2099 | goto out; | |
2100 | ||
1da177e4 | 2101 | /* register inet6 protocol */ |
7f4e4868 DL |
2102 | ret = inet6_register_protosw(&tcpv6_protosw); |
2103 | if (ret) | |
2104 | goto out_tcpv6_protocol; | |
2105 | ||
93ec926b | 2106 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2107 | if (ret) |
2108 | goto out_tcpv6_protosw; | |
2109 | out: | |
2110 | return ret; | |
ae0f7d5f | 2111 | |
7f4e4868 DL |
2112 | out_tcpv6_protocol: |
2113 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2114 | out_tcpv6_protosw: | |
2115 | inet6_unregister_protosw(&tcpv6_protosw); | |
2116 | goto out; | |
2117 | } | |
2118 | ||
09f7709f | 2119 | void tcpv6_exit(void) |
7f4e4868 | 2120 | { |
93ec926b | 2121 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2122 | inet6_unregister_protosw(&tcpv6_protosw); |
2123 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2124 | } |