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 | ||
eb4dea58 | 26 | #include <linux/bottom_half.h> |
1da177e4 | 27 | #include <linux/module.h> |
1da177e4 LT |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/socket.h> | |
31 | #include <linux/sockios.h> | |
32 | #include <linux/net.h> | |
33 | #include <linux/jiffies.h> | |
34 | #include <linux/in.h> | |
35 | #include <linux/in6.h> | |
36 | #include <linux/netdevice.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/jhash.h> | |
39 | #include <linux/ipsec.h> | |
40 | #include <linux/times.h> | |
5a0e3ad6 | 41 | #include <linux/slab.h> |
1da177e4 LT |
42 | |
43 | #include <linux/ipv6.h> | |
44 | #include <linux/icmpv6.h> | |
45 | #include <linux/random.h> | |
46 | ||
47 | #include <net/tcp.h> | |
48 | #include <net/ndisc.h> | |
5324a040 | 49 | #include <net/inet6_hashtables.h> |
8129765a | 50 | #include <net/inet6_connection_sock.h> |
1da177e4 LT |
51 | #include <net/ipv6.h> |
52 | #include <net/transp_v6.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/ip6_route.h> | |
55 | #include <net/ip6_checksum.h> | |
56 | #include <net/inet_ecn.h> | |
57 | #include <net/protocol.h> | |
58 | #include <net/xfrm.h> | |
1da177e4 LT |
59 | #include <net/snmp.h> |
60 | #include <net/dsfield.h> | |
6d6ee43e | 61 | #include <net/timewait_sock.h> |
18134bed | 62 | #include <net/netdma.h> |
3d58b5fa | 63 | #include <net/inet_common.h> |
1da177e4 LT |
64 | |
65 | #include <asm/uaccess.h> | |
66 | ||
67 | #include <linux/proc_fs.h> | |
68 | #include <linux/seq_file.h> | |
69 | ||
cfb6eeb4 YH |
70 | #include <linux/crypto.h> |
71 | #include <linux/scatterlist.h> | |
72 | ||
cfb6eeb4 | 73 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
6edafaaf GJ |
74 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
75 | struct request_sock *req); | |
1da177e4 LT |
76 | |
77 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
8ad50d96 HX |
78 | static void __tcp_v6_send_check(struct sk_buff *skb, |
79 | struct in6_addr *saddr, | |
80 | struct in6_addr *daddr); | |
1da177e4 | 81 | |
3b401a81 SH |
82 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
83 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 84 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
85 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
86 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
87 | #else |
88 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
89 | struct in6_addr *addr) | |
90 | { | |
91 | return NULL; | |
92 | } | |
a928630a | 93 | #endif |
1da177e4 | 94 | |
1da177e4 LT |
95 | static void tcp_v6_hash(struct sock *sk) |
96 | { | |
97 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 98 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
99 | tcp_prot.hash(sk); |
100 | return; | |
101 | } | |
102 | local_bh_disable(); | |
9327f705 | 103 | __inet6_hash(sk, NULL); |
1da177e4 LT |
104 | local_bh_enable(); |
105 | } | |
106 | } | |
107 | ||
684f2176 | 108 | static __inline__ __sum16 tcp_v6_check(int len, |
1ab1457c YH |
109 | struct in6_addr *saddr, |
110 | struct in6_addr *daddr, | |
868c86bc | 111 | __wsum base) |
1da177e4 LT |
112 | { |
113 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
114 | } | |
115 | ||
a94f723d | 116 | static __u32 tcp_v6_init_sequence(struct sk_buff *skb) |
1da177e4 | 117 | { |
0660e03f ACM |
118 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
119 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
120 | tcp_hdr(skb)->dest, |
121 | tcp_hdr(skb)->source); | |
1da177e4 LT |
122 | } |
123 | ||
1ab1457c | 124 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
125 | int addr_len) |
126 | { | |
127 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 128 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 129 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
130 | struct ipv6_pinfo *np = inet6_sk(sk); |
131 | struct tcp_sock *tp = tcp_sk(sk); | |
132 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
133 | struct flowi fl; | |
134 | struct dst_entry *dst; | |
135 | int addr_type; | |
136 | int err; | |
137 | ||
1ab1457c | 138 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
139 | return -EINVAL; |
140 | ||
1ab1457c | 141 | if (usin->sin6_family != AF_INET6) |
1da177e4 LT |
142 | return(-EAFNOSUPPORT); |
143 | ||
144 | memset(&fl, 0, sizeof(fl)); | |
145 | ||
146 | if (np->sndflow) { | |
147 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
148 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
149 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
150 | struct ip6_flowlabel *flowlabel; | |
151 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
152 | if (flowlabel == NULL) | |
153 | return -EINVAL; | |
154 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
155 | fl6_sock_release(flowlabel); | |
156 | } | |
157 | } | |
158 | ||
159 | /* | |
1ab1457c YH |
160 | * connect() to INADDR_ANY means loopback (BSD'ism). |
161 | */ | |
162 | ||
163 | if(ipv6_addr_any(&usin->sin6_addr)) | |
164 | usin->sin6_addr.s6_addr[15] = 0x1; | |
1da177e4 LT |
165 | |
166 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
167 | ||
168 | if(addr_type & IPV6_ADDR_MULTICAST) | |
169 | return -ENETUNREACH; | |
170 | ||
171 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
172 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
173 | usin->sin6_scope_id) { | |
174 | /* If interface is set while binding, indices | |
175 | * must coincide. | |
176 | */ | |
177 | if (sk->sk_bound_dev_if && | |
178 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
179 | return -EINVAL; | |
180 | ||
181 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
182 | } | |
183 | ||
184 | /* Connect to link-local address requires an interface */ | |
185 | if (!sk->sk_bound_dev_if) | |
186 | return -EINVAL; | |
187 | } | |
188 | ||
189 | if (tp->rx_opt.ts_recent_stamp && | |
190 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
191 | tp->rx_opt.ts_recent = 0; | |
192 | tp->rx_opt.ts_recent_stamp = 0; | |
193 | tp->write_seq = 0; | |
194 | } | |
195 | ||
196 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
197 | np->flow_label = fl.fl6_flowlabel; | |
198 | ||
199 | /* | |
200 | * TCP over IPv4 | |
201 | */ | |
202 | ||
203 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 204 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
205 | struct sockaddr_in sin; |
206 | ||
207 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
208 | ||
209 | if (__ipv6_only_sock(sk)) | |
210 | return -ENETUNREACH; | |
211 | ||
212 | sin.sin_family = AF_INET; | |
213 | sin.sin_port = usin->sin6_port; | |
214 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
215 | ||
d83d8461 | 216 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 217 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
218 | #ifdef CONFIG_TCP_MD5SIG |
219 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
220 | #endif | |
1da177e4 LT |
221 | |
222 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
223 | ||
224 | if (err) { | |
d83d8461 ACM |
225 | icsk->icsk_ext_hdr_len = exthdrlen; |
226 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 227 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
228 | #ifdef CONFIG_TCP_MD5SIG |
229 | tp->af_specific = &tcp_sock_ipv6_specific; | |
230 | #endif | |
1da177e4 LT |
231 | goto failure; |
232 | } else { | |
c720c7e8 ED |
233 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
234 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, | |
235 | &np->rcv_saddr); | |
1da177e4 LT |
236 | } |
237 | ||
238 | return err; | |
239 | } | |
240 | ||
241 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
242 | saddr = &np->rcv_saddr; | |
243 | ||
244 | fl.proto = IPPROTO_TCP; | |
245 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
246 | ipv6_addr_copy(&fl.fl6_src, | |
247 | (saddr ? saddr : &np->saddr)); | |
248 | fl.oif = sk->sk_bound_dev_if; | |
51953d5b | 249 | fl.mark = sk->sk_mark; |
1da177e4 | 250 | fl.fl_ip_dport = usin->sin6_port; |
c720c7e8 | 251 | fl.fl_ip_sport = inet->inet_sport; |
1da177e4 LT |
252 | |
253 | if (np->opt && np->opt->srcrt) { | |
254 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
255 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
256 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
257 | final_p = &final; | |
258 | } | |
259 | ||
beb8d13b VY |
260 | security_sk_classify_flow(sk, &fl); |
261 | ||
1da177e4 LT |
262 | err = ip6_dst_lookup(sk, &dst, &fl); |
263 | if (err) | |
264 | goto failure; | |
265 | if (final_p) | |
266 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
267 | ||
52479b62 AD |
268 | err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); |
269 | if (err < 0) { | |
14e50e57 DM |
270 | if (err == -EREMOTE) |
271 | err = ip6_dst_blackhole(sk, &dst, &fl); | |
272 | if (err < 0) | |
273 | goto failure; | |
274 | } | |
1da177e4 LT |
275 | |
276 | if (saddr == NULL) { | |
277 | saddr = &fl.fl6_src; | |
278 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
279 | } | |
280 | ||
281 | /* set the source address */ | |
282 | ipv6_addr_copy(&np->saddr, saddr); | |
c720c7e8 | 283 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 284 | |
f83ef8c0 | 285 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 286 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 287 | |
d83d8461 | 288 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 289 | if (np->opt) |
d83d8461 ACM |
290 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
291 | np->opt->opt_nflen); | |
1da177e4 LT |
292 | |
293 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
294 | ||
c720c7e8 | 295 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
296 | |
297 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 298 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
299 | if (err) |
300 | goto late_failure; | |
301 | ||
302 | if (!tp->write_seq) | |
303 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
304 | np->daddr.s6_addr32, | |
c720c7e8 ED |
305 | inet->inet_sport, |
306 | inet->inet_dport); | |
1da177e4 LT |
307 | |
308 | err = tcp_connect(sk); | |
309 | if (err) | |
310 | goto late_failure; | |
311 | ||
312 | return 0; | |
313 | ||
314 | late_failure: | |
315 | tcp_set_state(sk, TCP_CLOSE); | |
316 | __sk_dst_reset(sk); | |
317 | failure: | |
c720c7e8 | 318 | inet->inet_dport = 0; |
1da177e4 LT |
319 | sk->sk_route_caps = 0; |
320 | return err; | |
321 | } | |
322 | ||
323 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 324 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 LT |
325 | { |
326 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
505cbfc5 | 327 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
328 | struct ipv6_pinfo *np; |
329 | struct sock *sk; | |
330 | int err; | |
1ab1457c | 331 | struct tcp_sock *tp; |
1da177e4 | 332 | __u32 seq; |
ca12a1a4 | 333 | struct net *net = dev_net(skb->dev); |
1da177e4 | 334 | |
ca12a1a4 | 335 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 336 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
337 | |
338 | if (sk == NULL) { | |
e41b5368 DL |
339 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
340 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
341 | return; |
342 | } | |
343 | ||
344 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 345 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
346 | return; |
347 | } | |
348 | ||
349 | bh_lock_sock(sk); | |
350 | if (sock_owned_by_user(sk)) | |
de0744af | 351 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
352 | |
353 | if (sk->sk_state == TCP_CLOSE) | |
354 | goto out; | |
355 | ||
e802af9c SH |
356 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
357 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
358 | goto out; | |
359 | } | |
360 | ||
1da177e4 | 361 | tp = tcp_sk(sk); |
1ab1457c | 362 | seq = ntohl(th->seq); |
1da177e4 LT |
363 | if (sk->sk_state != TCP_LISTEN && |
364 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
de0744af | 365 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
366 | goto out; |
367 | } | |
368 | ||
369 | np = inet6_sk(sk); | |
370 | ||
371 | if (type == ICMPV6_PKT_TOOBIG) { | |
372 | struct dst_entry *dst = NULL; | |
373 | ||
374 | if (sock_owned_by_user(sk)) | |
375 | goto out; | |
376 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
377 | goto out; | |
378 | ||
379 | /* icmp should have updated the destination cache entry */ | |
380 | dst = __sk_dst_check(sk, np->dst_cookie); | |
381 | ||
382 | if (dst == NULL) { | |
383 | struct inet_sock *inet = inet_sk(sk); | |
384 | struct flowi fl; | |
385 | ||
386 | /* BUGGG_FUTURE: Again, it is not clear how | |
387 | to handle rthdr case. Ignore this complexity | |
388 | for now. | |
389 | */ | |
390 | memset(&fl, 0, sizeof(fl)); | |
391 | fl.proto = IPPROTO_TCP; | |
392 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
393 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
394 | fl.oif = sk->sk_bound_dev_if; | |
51953d5b | 395 | fl.mark = sk->sk_mark; |
c720c7e8 ED |
396 | fl.fl_ip_dport = inet->inet_dport; |
397 | fl.fl_ip_sport = inet->inet_sport; | |
beb8d13b | 398 | security_skb_classify_flow(skb, &fl); |
1da177e4 LT |
399 | |
400 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
401 | sk->sk_err_soft = -err; | |
402 | goto out; | |
403 | } | |
404 | ||
52479b62 | 405 | if ((err = xfrm_lookup(net, &dst, &fl, sk, 0)) < 0) { |
1da177e4 LT |
406 | sk->sk_err_soft = -err; |
407 | goto out; | |
408 | } | |
409 | ||
410 | } else | |
411 | dst_hold(dst); | |
412 | ||
d83d8461 | 413 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
1da177e4 LT |
414 | tcp_sync_mss(sk, dst_mtu(dst)); |
415 | tcp_simple_retransmit(sk); | |
416 | } /* else let the usual retransmit timer handle it */ | |
417 | dst_release(dst); | |
418 | goto out; | |
419 | } | |
420 | ||
421 | icmpv6_err_convert(type, code, &err); | |
422 | ||
60236fdd | 423 | /* Might be for an request_sock */ |
1da177e4 | 424 | switch (sk->sk_state) { |
60236fdd | 425 | struct request_sock *req, **prev; |
1da177e4 LT |
426 | case TCP_LISTEN: |
427 | if (sock_owned_by_user(sk)) | |
428 | goto out; | |
429 | ||
8129765a ACM |
430 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
431 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
432 | if (!req) |
433 | goto out; | |
434 | ||
435 | /* ICMPs are not backlogged, hence we cannot get | |
436 | * an established socket here. | |
437 | */ | |
547b792c | 438 | WARN_ON(req->sk != NULL); |
1da177e4 | 439 | |
2e6599cb | 440 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 441 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
442 | goto out; |
443 | } | |
444 | ||
463c84b9 | 445 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
446 | goto out; |
447 | ||
448 | case TCP_SYN_SENT: | |
449 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 450 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 451 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
452 | sk->sk_err = err; |
453 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
454 | ||
455 | tcp_done(sk); | |
456 | } else | |
457 | sk->sk_err_soft = err; | |
458 | goto out; | |
459 | } | |
460 | ||
461 | if (!sock_owned_by_user(sk) && np->recverr) { | |
462 | sk->sk_err = err; | |
463 | sk->sk_error_report(sk); | |
464 | } else | |
465 | sk->sk_err_soft = err; | |
466 | ||
467 | out: | |
468 | bh_unlock_sock(sk); | |
469 | sock_put(sk); | |
470 | } | |
471 | ||
472 | ||
e6b4d113 WAS |
473 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, |
474 | struct request_values *rvp) | |
1da177e4 | 475 | { |
ca304b61 | 476 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
477 | struct ipv6_pinfo *np = inet6_sk(sk); |
478 | struct sk_buff * skb; | |
479 | struct ipv6_txoptions *opt = NULL; | |
480 | struct in6_addr * final_p = NULL, final; | |
481 | struct flowi fl; | |
fd80eb94 | 482 | struct dst_entry *dst; |
1da177e4 LT |
483 | int err = -1; |
484 | ||
485 | memset(&fl, 0, sizeof(fl)); | |
486 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
487 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
488 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 489 | fl.fl6_flowlabel = 0; |
2e6599cb | 490 | fl.oif = treq->iif; |
51953d5b | 491 | fl.mark = sk->sk_mark; |
2e6599cb | 492 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
fd507037 | 493 | fl.fl_ip_sport = inet_rsk(req)->loc_port; |
4237c75c | 494 | security_req_classify_flow(req, &fl); |
1da177e4 | 495 | |
fd80eb94 DL |
496 | opt = np->opt; |
497 | if (opt && opt->srcrt) { | |
498 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
499 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
500 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
501 | final_p = &final; | |
1da177e4 LT |
502 | } |
503 | ||
fd80eb94 DL |
504 | err = ip6_dst_lookup(sk, &dst, &fl); |
505 | if (err) | |
506 | goto done; | |
507 | if (final_p) | |
508 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
52479b62 | 509 | if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) |
fd80eb94 DL |
510 | goto done; |
511 | ||
e6b4d113 | 512 | skb = tcp_make_synack(sk, dst, req, rvp); |
1da177e4 | 513 | if (skb) { |
8ad50d96 | 514 | __tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr); |
1da177e4 | 515 | |
2e6599cb | 516 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
4e15ed4d | 517 | err = ip6_xmit(sk, skb, &fl, opt); |
b9df3cb8 | 518 | err = net_xmit_eval(err); |
1da177e4 LT |
519 | } |
520 | ||
521 | done: | |
1ab1457c | 522 | if (opt && opt != np->opt) |
1da177e4 | 523 | sock_kfree_s(sk, opt, opt->tot_len); |
78b91042 | 524 | dst_release(dst); |
1da177e4 LT |
525 | return err; |
526 | } | |
527 | ||
72659ecc OP |
528 | static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req, |
529 | struct request_values *rvp) | |
530 | { | |
531 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); | |
532 | return tcp_v6_send_synack(sk, req, rvp); | |
533 | } | |
534 | ||
c6aefafb GG |
535 | static inline void syn_flood_warning(struct sk_buff *skb) |
536 | { | |
537 | #ifdef CONFIG_SYN_COOKIES | |
538 | if (sysctl_tcp_syncookies) | |
539 | printk(KERN_INFO | |
540 | "TCPv6: Possible SYN flooding on port %d. " | |
541 | "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest)); | |
542 | else | |
543 | #endif | |
544 | printk(KERN_INFO | |
545 | "TCPv6: Possible SYN flooding on port %d. " | |
546 | "Dropping request.\n", ntohs(tcp_hdr(skb)->dest)); | |
547 | } | |
548 | ||
60236fdd | 549 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 550 | { |
800d55f1 | 551 | kfree_skb(inet6_rsk(req)->pktopts); |
1da177e4 LT |
552 | } |
553 | ||
cfb6eeb4 YH |
554 | #ifdef CONFIG_TCP_MD5SIG |
555 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
556 | struct in6_addr *addr) | |
557 | { | |
558 | struct tcp_sock *tp = tcp_sk(sk); | |
559 | int i; | |
560 | ||
561 | BUG_ON(tp == NULL); | |
562 | ||
563 | if (!tp->md5sig_info || !tp->md5sig_info->entries6) | |
564 | return NULL; | |
565 | ||
566 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 567 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr)) |
f8ab18d2 | 568 | return &tp->md5sig_info->keys6[i].base; |
cfb6eeb4 YH |
569 | } |
570 | return NULL; | |
571 | } | |
572 | ||
573 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
574 | struct sock *addr_sk) | |
575 | { | |
576 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); | |
577 | } | |
578 | ||
579 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
580 | struct request_sock *req) | |
581 | { | |
582 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
583 | } | |
584 | ||
585 | static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer, | |
586 | char *newkey, u8 newkeylen) | |
587 | { | |
588 | /* Add key to the list */ | |
b0a713e9 | 589 | struct tcp_md5sig_key *key; |
cfb6eeb4 YH |
590 | struct tcp_sock *tp = tcp_sk(sk); |
591 | struct tcp6_md5sig_key *keys; | |
592 | ||
b0a713e9 | 593 | key = tcp_v6_md5_do_lookup(sk, peer); |
cfb6eeb4 YH |
594 | if (key) { |
595 | /* modify existing entry - just update that one */ | |
b0a713e9 MD |
596 | kfree(key->key); |
597 | key->key = newkey; | |
598 | key->keylen = newkeylen; | |
cfb6eeb4 YH |
599 | } else { |
600 | /* reallocate new list if current one is full. */ | |
601 | if (!tp->md5sig_info) { | |
602 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC); | |
603 | if (!tp->md5sig_info) { | |
604 | kfree(newkey); | |
605 | return -ENOMEM; | |
606 | } | |
a465419b | 607 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
cfb6eeb4 | 608 | } |
aa133076 | 609 | if (tcp_alloc_md5sig_pool(sk) == NULL) { |
aacbe8c8 YH |
610 | kfree(newkey); |
611 | return -ENOMEM; | |
612 | } | |
cfb6eeb4 YH |
613 | if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) { |
614 | keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) * | |
615 | (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC); | |
616 | ||
617 | if (!keys) { | |
618 | tcp_free_md5sig_pool(); | |
619 | kfree(newkey); | |
620 | return -ENOMEM; | |
621 | } | |
622 | ||
623 | if (tp->md5sig_info->entries6) | |
624 | memmove(keys, tp->md5sig_info->keys6, | |
625 | (sizeof (tp->md5sig_info->keys6[0]) * | |
626 | tp->md5sig_info->entries6)); | |
627 | ||
628 | kfree(tp->md5sig_info->keys6); | |
629 | tp->md5sig_info->keys6 = keys; | |
630 | tp->md5sig_info->alloced6++; | |
631 | } | |
632 | ||
633 | ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr, | |
634 | peer); | |
f8ab18d2 DM |
635 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey; |
636 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen; | |
cfb6eeb4 YH |
637 | |
638 | tp->md5sig_info->entries6++; | |
639 | } | |
640 | return 0; | |
641 | } | |
642 | ||
643 | static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk, | |
644 | u8 *newkey, __u8 newkeylen) | |
645 | { | |
646 | return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr, | |
647 | newkey, newkeylen); | |
648 | } | |
649 | ||
650 | static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer) | |
651 | { | |
652 | struct tcp_sock *tp = tcp_sk(sk); | |
653 | int i; | |
654 | ||
655 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 656 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) { |
cfb6eeb4 | 657 | /* Free the key */ |
f8ab18d2 | 658 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
659 | tp->md5sig_info->entries6--; |
660 | ||
661 | if (tp->md5sig_info->entries6 == 0) { | |
662 | kfree(tp->md5sig_info->keys6); | |
663 | tp->md5sig_info->keys6 = NULL; | |
ca983cef | 664 | tp->md5sig_info->alloced6 = 0; |
cfb6eeb4 YH |
665 | } else { |
666 | /* shrink the database */ | |
667 | if (tp->md5sig_info->entries6 != i) | |
668 | memmove(&tp->md5sig_info->keys6[i], | |
669 | &tp->md5sig_info->keys6[i+1], | |
670 | (tp->md5sig_info->entries6 - i) | |
671 | * sizeof (tp->md5sig_info->keys6[0])); | |
672 | } | |
77adefdc YH |
673 | tcp_free_md5sig_pool(); |
674 | return 0; | |
cfb6eeb4 YH |
675 | } |
676 | } | |
677 | return -ENOENT; | |
678 | } | |
679 | ||
680 | static void tcp_v6_clear_md5_list (struct sock *sk) | |
681 | { | |
682 | struct tcp_sock *tp = tcp_sk(sk); | |
683 | int i; | |
684 | ||
685 | if (tp->md5sig_info->entries6) { | |
686 | for (i = 0; i < tp->md5sig_info->entries6; i++) | |
f8ab18d2 | 687 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
688 | tp->md5sig_info->entries6 = 0; |
689 | tcp_free_md5sig_pool(); | |
690 | } | |
691 | ||
692 | kfree(tp->md5sig_info->keys6); | |
693 | tp->md5sig_info->keys6 = NULL; | |
694 | tp->md5sig_info->alloced6 = 0; | |
695 | ||
696 | if (tp->md5sig_info->entries4) { | |
697 | for (i = 0; i < tp->md5sig_info->entries4; i++) | |
f8ab18d2 | 698 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
699 | tp->md5sig_info->entries4 = 0; |
700 | tcp_free_md5sig_pool(); | |
701 | } | |
702 | ||
703 | kfree(tp->md5sig_info->keys4); | |
704 | tp->md5sig_info->keys4 = NULL; | |
705 | tp->md5sig_info->alloced4 = 0; | |
706 | } | |
707 | ||
708 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, | |
709 | int optlen) | |
710 | { | |
711 | struct tcp_md5sig cmd; | |
712 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
713 | u8 *newkey; | |
714 | ||
715 | if (optlen < sizeof(cmd)) | |
716 | return -EINVAL; | |
717 | ||
718 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
719 | return -EFAULT; | |
720 | ||
721 | if (sin6->sin6_family != AF_INET6) | |
722 | return -EINVAL; | |
723 | ||
724 | if (!cmd.tcpm_keylen) { | |
725 | if (!tcp_sk(sk)->md5sig_info) | |
726 | return -ENOENT; | |
e773e4fa | 727 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
cfb6eeb4 YH |
728 | return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]); |
729 | return tcp_v6_md5_do_del(sk, &sin6->sin6_addr); | |
730 | } | |
731 | ||
732 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
733 | return -EINVAL; | |
734 | ||
735 | if (!tcp_sk(sk)->md5sig_info) { | |
736 | struct tcp_sock *tp = tcp_sk(sk); | |
737 | struct tcp_md5sig_info *p; | |
738 | ||
739 | p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL); | |
740 | if (!p) | |
741 | return -ENOMEM; | |
742 | ||
743 | tp->md5sig_info = p; | |
a465419b | 744 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
cfb6eeb4 YH |
745 | } |
746 | ||
af879cc7 | 747 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
748 | if (!newkey) |
749 | return -ENOMEM; | |
e773e4fa | 750 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { |
cfb6eeb4 YH |
751 | return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3], |
752 | newkey, cmd.tcpm_keylen); | |
753 | } | |
754 | return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen); | |
755 | } | |
756 | ||
49a72dfb AL |
757 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
758 | struct in6_addr *daddr, | |
759 | struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 760 | { |
cfb6eeb4 | 761 | struct tcp6_pseudohdr *bp; |
49a72dfb | 762 | struct scatterlist sg; |
8d26d76d | 763 | |
cfb6eeb4 | 764 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 YH |
765 | /* 1. TCP pseudo-header (RFC2460) */ |
766 | ipv6_addr_copy(&bp->saddr, saddr); | |
767 | ipv6_addr_copy(&bp->daddr, daddr); | |
49a72dfb | 768 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 769 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 770 | |
49a72dfb AL |
771 | sg_init_one(&sg, bp, sizeof(*bp)); |
772 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
773 | } | |
c7da57a1 | 774 | |
49a72dfb AL |
775 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
776 | struct in6_addr *daddr, struct in6_addr *saddr, | |
777 | struct tcphdr *th) | |
778 | { | |
779 | struct tcp_md5sig_pool *hp; | |
780 | struct hash_desc *desc; | |
781 | ||
782 | hp = tcp_get_md5sig_pool(); | |
783 | if (!hp) | |
784 | goto clear_hash_noput; | |
785 | desc = &hp->md5_desc; | |
786 | ||
787 | if (crypto_hash_init(desc)) | |
788 | goto clear_hash; | |
789 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
790 | goto clear_hash; | |
791 | if (tcp_md5_hash_header(hp, th)) | |
792 | goto clear_hash; | |
793 | if (tcp_md5_hash_key(hp, key)) | |
794 | goto clear_hash; | |
795 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 796 | goto clear_hash; |
cfb6eeb4 | 797 | |
cfb6eeb4 | 798 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 799 | return 0; |
49a72dfb | 800 | |
cfb6eeb4 YH |
801 | clear_hash: |
802 | tcp_put_md5sig_pool(); | |
803 | clear_hash_noput: | |
804 | memset(md5_hash, 0, 16); | |
49a72dfb | 805 | return 1; |
cfb6eeb4 YH |
806 | } |
807 | ||
49a72dfb AL |
808 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
809 | struct sock *sk, struct request_sock *req, | |
810 | struct sk_buff *skb) | |
cfb6eeb4 YH |
811 | { |
812 | struct in6_addr *saddr, *daddr; | |
49a72dfb AL |
813 | struct tcp_md5sig_pool *hp; |
814 | struct hash_desc *desc; | |
815 | struct tcphdr *th = tcp_hdr(skb); | |
cfb6eeb4 YH |
816 | |
817 | if (sk) { | |
818 | saddr = &inet6_sk(sk)->saddr; | |
819 | daddr = &inet6_sk(sk)->daddr; | |
49a72dfb | 820 | } else if (req) { |
cfb6eeb4 YH |
821 | saddr = &inet6_rsk(req)->loc_addr; |
822 | daddr = &inet6_rsk(req)->rmt_addr; | |
49a72dfb AL |
823 | } else { |
824 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
825 | saddr = &ip6h->saddr; | |
826 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 827 | } |
49a72dfb AL |
828 | |
829 | hp = tcp_get_md5sig_pool(); | |
830 | if (!hp) | |
831 | goto clear_hash_noput; | |
832 | desc = &hp->md5_desc; | |
833 | ||
834 | if (crypto_hash_init(desc)) | |
835 | goto clear_hash; | |
836 | ||
837 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
838 | goto clear_hash; | |
839 | if (tcp_md5_hash_header(hp, th)) | |
840 | goto clear_hash; | |
841 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
842 | goto clear_hash; | |
843 | if (tcp_md5_hash_key(hp, key)) | |
844 | goto clear_hash; | |
845 | if (crypto_hash_final(desc, md5_hash)) | |
846 | goto clear_hash; | |
847 | ||
848 | tcp_put_md5sig_pool(); | |
849 | return 0; | |
850 | ||
851 | clear_hash: | |
852 | tcp_put_md5sig_pool(); | |
853 | clear_hash_noput: | |
854 | memset(md5_hash, 0, 16); | |
855 | return 1; | |
cfb6eeb4 YH |
856 | } |
857 | ||
858 | static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb) | |
859 | { | |
860 | __u8 *hash_location = NULL; | |
861 | struct tcp_md5sig_key *hash_expected; | |
0660e03f | 862 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
aa8223c7 | 863 | struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 864 | int genhash; |
cfb6eeb4 YH |
865 | u8 newhash[16]; |
866 | ||
867 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 868 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 869 | |
785957d3 DM |
870 | /* We've parsed the options - do we have a hash? */ |
871 | if (!hash_expected && !hash_location) | |
872 | return 0; | |
873 | ||
874 | if (hash_expected && !hash_location) { | |
875 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
876 | return 1; |
877 | } | |
878 | ||
785957d3 DM |
879 | if (!hash_expected && hash_location) { |
880 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
881 | return 1; |
882 | } | |
883 | ||
884 | /* check the signature */ | |
49a72dfb AL |
885 | genhash = tcp_v6_md5_hash_skb(newhash, |
886 | hash_expected, | |
887 | NULL, NULL, skb); | |
888 | ||
cfb6eeb4 YH |
889 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
890 | if (net_ratelimit()) { | |
5856b606 | 891 | printk(KERN_INFO "MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
cfb6eeb4 | 892 | genhash ? "failed" : "mismatch", |
0c6ce78a HH |
893 | &ip6h->saddr, ntohs(th->source), |
894 | &ip6h->daddr, ntohs(th->dest)); | |
cfb6eeb4 YH |
895 | } |
896 | return 1; | |
897 | } | |
898 | return 0; | |
899 | } | |
900 | #endif | |
901 | ||
c6aefafb | 902 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 903 | .family = AF_INET6, |
2e6599cb | 904 | .obj_size = sizeof(struct tcp6_request_sock), |
72659ecc | 905 | .rtx_syn_ack = tcp_v6_rtx_synack, |
60236fdd ACM |
906 | .send_ack = tcp_v6_reqsk_send_ack, |
907 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc OP |
908 | .send_reset = tcp_v6_send_reset, |
909 | .syn_ack_timeout = tcp_syn_ack_timeout, | |
1da177e4 LT |
910 | }; |
911 | ||
cfb6eeb4 | 912 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 913 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 914 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 915 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 916 | }; |
b6332e6c | 917 | #endif |
cfb6eeb4 | 918 | |
6d6ee43e ACM |
919 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
920 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
921 | .twsk_unique = tcp_twsk_unique, | |
cfb6eeb4 | 922 | .twsk_destructor= tcp_twsk_destructor, |
6d6ee43e ACM |
923 | }; |
924 | ||
8ad50d96 HX |
925 | static void __tcp_v6_send_check(struct sk_buff *skb, |
926 | struct in6_addr *saddr, struct in6_addr *daddr) | |
1da177e4 | 927 | { |
aa8223c7 | 928 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 929 | |
84fa7933 | 930 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
8ad50d96 | 931 | th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0); |
663ead3b | 932 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 933 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 934 | } else { |
8ad50d96 HX |
935 | th->check = tcp_v6_check(skb->len, saddr, daddr, |
936 | csum_partial(th, th->doff << 2, | |
937 | skb->csum)); | |
1da177e4 LT |
938 | } |
939 | } | |
940 | ||
bb296246 | 941 | static void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
8ad50d96 HX |
942 | { |
943 | struct ipv6_pinfo *np = inet6_sk(sk); | |
944 | ||
945 | __tcp_v6_send_check(skb, &np->saddr, &np->daddr); | |
946 | } | |
947 | ||
a430a43d HX |
948 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
949 | { | |
950 | struct ipv6hdr *ipv6h; | |
951 | struct tcphdr *th; | |
952 | ||
953 | if (!pskb_may_pull(skb, sizeof(*th))) | |
954 | return -EINVAL; | |
955 | ||
0660e03f | 956 | ipv6h = ipv6_hdr(skb); |
aa8223c7 | 957 | th = tcp_hdr(skb); |
a430a43d HX |
958 | |
959 | th->check = 0; | |
84fa7933 | 960 | skb->ip_summed = CHECKSUM_PARTIAL; |
8ad50d96 | 961 | __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr); |
a430a43d HX |
962 | return 0; |
963 | } | |
1da177e4 | 964 | |
36990673 HX |
965 | static struct sk_buff **tcp6_gro_receive(struct sk_buff **head, |
966 | struct sk_buff *skb) | |
684f2176 | 967 | { |
36e7b1b8 | 968 | struct ipv6hdr *iph = skb_gro_network_header(skb); |
684f2176 HX |
969 | |
970 | switch (skb->ip_summed) { | |
971 | case CHECKSUM_COMPLETE: | |
86911732 | 972 | if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr, |
684f2176 HX |
973 | skb->csum)) { |
974 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
975 | break; | |
976 | } | |
977 | ||
978 | /* fall through */ | |
979 | case CHECKSUM_NONE: | |
980 | NAPI_GRO_CB(skb)->flush = 1; | |
981 | return NULL; | |
982 | } | |
983 | ||
984 | return tcp_gro_receive(head, skb); | |
985 | } | |
684f2176 | 986 | |
36990673 | 987 | static int tcp6_gro_complete(struct sk_buff *skb) |
684f2176 HX |
988 | { |
989 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
990 | struct tcphdr *th = tcp_hdr(skb); | |
991 | ||
992 | th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb), | |
993 | &iph->saddr, &iph->daddr, 0); | |
994 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
995 | ||
996 | return tcp_gro_complete(skb); | |
997 | } | |
684f2176 | 998 | |
626e264d IJ |
999 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
1000 | u32 ts, struct tcp_md5sig_key *key, int rst) | |
1da177e4 | 1001 | { |
aa8223c7 | 1002 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
1003 | struct sk_buff *buff; |
1004 | struct flowi fl; | |
adf30907 | 1005 | struct net *net = dev_net(skb_dst(skb)->dev); |
e5047992 | 1006 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 1007 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 1008 | struct dst_entry *dst; |
81ada62d | 1009 | __be32 *topt; |
1da177e4 | 1010 | |
626e264d IJ |
1011 | if (ts) |
1012 | tot_len += TCPOLEN_TSTAMP_ALIGNED; | |
cfb6eeb4 | 1013 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
1014 | if (key) |
1015 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
1016 | #endif | |
1017 | ||
cfb6eeb4 | 1018 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 1019 | GFP_ATOMIC); |
1ab1457c YH |
1020 | if (buff == NULL) |
1021 | return; | |
1da177e4 | 1022 | |
cfb6eeb4 | 1023 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 1024 | |
cfb6eeb4 | 1025 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 1026 | skb_reset_transport_header(buff); |
1da177e4 LT |
1027 | |
1028 | /* Swap the send and the receive. */ | |
1029 | memset(t1, 0, sizeof(*t1)); | |
1030 | t1->dest = th->source; | |
1031 | t1->source = th->dest; | |
cfb6eeb4 | 1032 | t1->doff = tot_len / 4; |
626e264d IJ |
1033 | t1->seq = htonl(seq); |
1034 | t1->ack_seq = htonl(ack); | |
1035 | t1->ack = !rst || !th->ack; | |
1036 | t1->rst = rst; | |
1037 | t1->window = htons(win); | |
1da177e4 | 1038 | |
81ada62d IJ |
1039 | topt = (__be32 *)(t1 + 1); |
1040 | ||
626e264d IJ |
1041 | if (ts) { |
1042 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
1043 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
1044 | *topt++ = htonl(tcp_time_stamp); | |
1045 | *topt++ = htonl(ts); | |
1046 | } | |
1047 | ||
cfb6eeb4 YH |
1048 | #ifdef CONFIG_TCP_MD5SIG |
1049 | if (key) { | |
81ada62d IJ |
1050 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
1051 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
1052 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
1053 | &ipv6_hdr(skb)->saddr, |
1054 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
1055 | } |
1056 | #endif | |
1057 | ||
1da177e4 | 1058 | memset(&fl, 0, sizeof(fl)); |
0660e03f ACM |
1059 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
1060 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 | 1061 | |
e5700aff DM |
1062 | buff->ip_summed = CHECKSUM_PARTIAL; |
1063 | buff->csum = 0; | |
1064 | ||
8ad50d96 | 1065 | __tcp_v6_send_check(buff, &fl.fl6_src, &fl.fl6_dst); |
1da177e4 LT |
1066 | |
1067 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 1068 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
1069 | fl.fl_ip_dport = t1->dest; |
1070 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 1071 | security_skb_classify_flow(skb, &fl); |
1da177e4 | 1072 | |
c20121ae DL |
1073 | /* Pass a socket to ip6_dst_lookup either it is for RST |
1074 | * Underlying function will use this to retrieve the network | |
1075 | * namespace | |
1076 | */ | |
adf30907 ED |
1077 | if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) { |
1078 | if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) { | |
1079 | skb_dst_set(buff, dst); | |
4e15ed4d | 1080 | ip6_xmit(ctl_sk, buff, &fl, NULL); |
63231bdd | 1081 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
626e264d IJ |
1082 | if (rst) |
1083 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
1da177e4 | 1084 | return; |
ecc51b6d | 1085 | } |
1da177e4 LT |
1086 | } |
1087 | ||
1088 | kfree_skb(buff); | |
1089 | } | |
1090 | ||
626e264d | 1091 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1092 | { |
626e264d IJ |
1093 | struct tcphdr *th = tcp_hdr(skb); |
1094 | u32 seq = 0, ack_seq = 0; | |
fa3e5b4e | 1095 | struct tcp_md5sig_key *key = NULL; |
1da177e4 | 1096 | |
626e264d | 1097 | if (th->rst) |
1da177e4 LT |
1098 | return; |
1099 | ||
626e264d IJ |
1100 | if (!ipv6_unicast_destination(skb)) |
1101 | return; | |
1da177e4 | 1102 | |
cfb6eeb4 | 1103 | #ifdef CONFIG_TCP_MD5SIG |
626e264d IJ |
1104 | if (sk) |
1105 | key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr); | |
cfb6eeb4 YH |
1106 | #endif |
1107 | ||
626e264d IJ |
1108 | if (th->ack) |
1109 | seq = ntohl(th->ack_seq); | |
1110 | else | |
1111 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
1112 | (th->doff << 2); | |
1da177e4 | 1113 | |
626e264d IJ |
1114 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1); |
1115 | } | |
1da177e4 | 1116 | |
626e264d IJ |
1117 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts, |
1118 | struct tcp_md5sig_key *key) | |
1119 | { | |
1120 | tcp_v6_send_response(skb, seq, ack, win, ts, key, 0); | |
1da177e4 LT |
1121 | } |
1122 | ||
1123 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1124 | { | |
8feaf0c0 | 1125 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 1126 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 1127 | |
9501f972 | 1128 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 1129 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
9501f972 | 1130 | tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw)); |
1da177e4 | 1131 | |
8feaf0c0 | 1132 | inet_twsk_put(tw); |
1da177e4 LT |
1133 | } |
1134 | ||
6edafaaf GJ |
1135 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
1136 | struct request_sock *req) | |
1da177e4 | 1137 | { |
9501f972 | 1138 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent, |
6edafaaf | 1139 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr)); |
1da177e4 LT |
1140 | } |
1141 | ||
1142 | ||
1143 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
1144 | { | |
60236fdd | 1145 | struct request_sock *req, **prev; |
aa8223c7 | 1146 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
1147 | struct sock *nsk; |
1148 | ||
1149 | /* Find possible connection requests. */ | |
8129765a | 1150 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
1151 | &ipv6_hdr(skb)->saddr, |
1152 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 LT |
1153 | if (req) |
1154 | return tcp_check_req(sk, skb, req, prev); | |
1155 | ||
3b1e0a65 | 1156 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
1157 | &ipv6_hdr(skb)->saddr, th->source, |
1158 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
1159 | |
1160 | if (nsk) { | |
1161 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1162 | bh_lock_sock(nsk); | |
1163 | return nsk; | |
1164 | } | |
9469c7b4 | 1165 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1166 | return NULL; |
1167 | } | |
1168 | ||
c6aefafb | 1169 | #ifdef CONFIG_SYN_COOKIES |
1da177e4 | 1170 | if (!th->rst && !th->syn && th->ack) |
c6aefafb | 1171 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1172 | #endif |
1173 | return sk; | |
1174 | } | |
1175 | ||
1da177e4 LT |
1176 | /* FIXME: this is substantially similar to the ipv4 code. |
1177 | * Can some kind of merge be done? -- erics | |
1178 | */ | |
1179 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1180 | { | |
4957faad | 1181 | struct tcp_extend_values tmp_ext; |
e6b4d113 | 1182 | struct tcp_options_received tmp_opt; |
4957faad | 1183 | u8 *hash_location; |
e6b4d113 | 1184 | struct request_sock *req; |
ca304b61 | 1185 | struct inet6_request_sock *treq; |
1da177e4 | 1186 | struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 | 1187 | struct tcp_sock *tp = tcp_sk(sk); |
e6b4d113 | 1188 | __u32 isn = TCP_SKB_CB(skb)->when; |
c6aefafb GG |
1189 | #ifdef CONFIG_SYN_COOKIES |
1190 | int want_cookie = 0; | |
1191 | #else | |
1192 | #define want_cookie 0 | |
1193 | #endif | |
1da177e4 LT |
1194 | |
1195 | if (skb->protocol == htons(ETH_P_IP)) | |
1196 | return tcp_v4_conn_request(sk, skb); | |
1197 | ||
1198 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1199 | goto drop; |
1da177e4 | 1200 | |
463c84b9 | 1201 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 | 1202 | if (net_ratelimit()) |
c6aefafb GG |
1203 | syn_flood_warning(skb); |
1204 | #ifdef CONFIG_SYN_COOKIES | |
1205 | if (sysctl_tcp_syncookies) | |
1206 | want_cookie = 1; | |
1207 | else | |
1208 | #endif | |
1ab1457c | 1209 | goto drop; |
1da177e4 LT |
1210 | } |
1211 | ||
463c84b9 | 1212 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1213 | goto drop; |
1214 | ||
ca304b61 | 1215 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1216 | if (req == NULL) |
1217 | goto drop; | |
1218 | ||
cfb6eeb4 YH |
1219 | #ifdef CONFIG_TCP_MD5SIG |
1220 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
1221 | #endif | |
1222 | ||
1da177e4 LT |
1223 | tcp_clear_options(&tmp_opt); |
1224 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1225 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
bb5b7c11 | 1226 | tcp_parse_options(skb, &tmp_opt, &hash_location, 0); |
4957faad WAS |
1227 | |
1228 | if (tmp_opt.cookie_plus > 0 && | |
1229 | tmp_opt.saw_tstamp && | |
1230 | !tp->rx_opt.cookie_out_never && | |
1231 | (sysctl_tcp_cookie_size > 0 || | |
1232 | (tp->cookie_values != NULL && | |
1233 | tp->cookie_values->cookie_desired > 0))) { | |
1234 | u8 *c; | |
1235 | u32 *d; | |
1236 | u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS]; | |
1237 | int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE; | |
1238 | ||
1239 | if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0) | |
1240 | goto drop_and_free; | |
1241 | ||
1242 | /* Secret recipe starts with IP addresses */ | |
0eae88f3 | 1243 | d = (__force u32 *)&ipv6_hdr(skb)->daddr.s6_addr32[0]; |
4957faad WAS |
1244 | *mess++ ^= *d++; |
1245 | *mess++ ^= *d++; | |
1246 | *mess++ ^= *d++; | |
1247 | *mess++ ^= *d++; | |
0eae88f3 | 1248 | d = (__force u32 *)&ipv6_hdr(skb)->saddr.s6_addr32[0]; |
4957faad WAS |
1249 | *mess++ ^= *d++; |
1250 | *mess++ ^= *d++; | |
1251 | *mess++ ^= *d++; | |
1252 | *mess++ ^= *d++; | |
1253 | ||
1254 | /* plus variable length Initiator Cookie */ | |
1255 | c = (u8 *)mess; | |
1256 | while (l-- > 0) | |
1257 | *c++ ^= *hash_location++; | |
1da177e4 | 1258 | |
4957faad WAS |
1259 | #ifdef CONFIG_SYN_COOKIES |
1260 | want_cookie = 0; /* not our kind of cookie */ | |
1261 | #endif | |
1262 | tmp_ext.cookie_out_never = 0; /* false */ | |
1263 | tmp_ext.cookie_plus = tmp_opt.cookie_plus; | |
1264 | } else if (!tp->rx_opt.cookie_in_always) { | |
1265 | /* redundant indications, but ensure initialization. */ | |
1266 | tmp_ext.cookie_out_never = 1; /* true */ | |
1267 | tmp_ext.cookie_plus = 0; | |
1268 | } else { | |
1269 | goto drop_and_free; | |
1270 | } | |
1271 | tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always; | |
1da177e4 | 1272 | |
4dfc2817 | 1273 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 1274 | tcp_clear_options(&tmp_opt); |
c6aefafb | 1275 | |
1da177e4 LT |
1276 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1277 | tcp_openreq_init(req, &tmp_opt, skb); | |
1278 | ||
ca304b61 | 1279 | treq = inet6_rsk(req); |
0660e03f ACM |
1280 | ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr); |
1281 | ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr); | |
c6aefafb GG |
1282 | if (!want_cookie) |
1283 | TCP_ECN_create_request(req, tcp_hdr(skb)); | |
1284 | ||
1285 | if (want_cookie) { | |
1286 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); | |
4dfc2817 | 1287 | req->cookie_ts = tmp_opt.tstamp_ok; |
c6aefafb GG |
1288 | } else if (!isn) { |
1289 | if (ipv6_opt_accepted(sk, skb) || | |
1290 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1291 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1292 | atomic_inc(&skb->users); | |
1293 | treq->pktopts = skb; | |
1294 | } | |
1295 | treq->iif = sk->sk_bound_dev_if; | |
1da177e4 | 1296 | |
c6aefafb GG |
1297 | /* So that link locals have meaning */ |
1298 | if (!sk->sk_bound_dev_if && | |
1299 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1300 | treq->iif = inet6_iif(skb); | |
1da177e4 | 1301 | |
a94f723d | 1302 | isn = tcp_v6_init_sequence(skb); |
c6aefafb | 1303 | } |
2e6599cb | 1304 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1305 | |
4237c75c VY |
1306 | security_inet_conn_request(sk, skb, req); |
1307 | ||
4957faad WAS |
1308 | if (tcp_v6_send_synack(sk, req, |
1309 | (struct request_values *)&tmp_ext) || | |
1310 | want_cookie) | |
e6b4d113 | 1311 | goto drop_and_free; |
1da177e4 | 1312 | |
e6b4d113 WAS |
1313 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1314 | return 0; | |
1da177e4 | 1315 | |
e6b4d113 WAS |
1316 | drop_and_free: |
1317 | reqsk_free(req); | |
1da177e4 | 1318 | drop: |
1da177e4 LT |
1319 | return 0; /* don't send reset */ |
1320 | } | |
1321 | ||
1322 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1323 | struct request_sock *req, |
1da177e4 LT |
1324 | struct dst_entry *dst) |
1325 | { | |
78d15e82 | 1326 | struct inet6_request_sock *treq; |
1da177e4 LT |
1327 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1328 | struct tcp6_sock *newtcp6sk; | |
1329 | struct inet_sock *newinet; | |
1330 | struct tcp_sock *newtp; | |
1331 | struct sock *newsk; | |
1332 | struct ipv6_txoptions *opt; | |
cfb6eeb4 YH |
1333 | #ifdef CONFIG_TCP_MD5SIG |
1334 | struct tcp_md5sig_key *key; | |
1335 | #endif | |
1da177e4 LT |
1336 | |
1337 | if (skb->protocol == htons(ETH_P_IP)) { | |
1338 | /* | |
1339 | * v6 mapped | |
1340 | */ | |
1341 | ||
1342 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1343 | ||
1ab1457c | 1344 | if (newsk == NULL) |
1da177e4 LT |
1345 | return NULL; |
1346 | ||
1347 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1348 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1349 | ||
1350 | newinet = inet_sk(newsk); | |
1351 | newnp = inet6_sk(newsk); | |
1352 | newtp = tcp_sk(newsk); | |
1353 | ||
1354 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1355 | ||
c720c7e8 | 1356 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); |
1da177e4 | 1357 | |
c720c7e8 | 1358 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 LT |
1359 | |
1360 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1361 | ||
8292a17a | 1362 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1363 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1364 | #ifdef CONFIG_TCP_MD5SIG |
1365 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1366 | #endif | |
1367 | ||
1da177e4 LT |
1368 | newnp->pktoptions = NULL; |
1369 | newnp->opt = NULL; | |
505cbfc5 | 1370 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1371 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 | 1372 | |
e6848976 ACM |
1373 | /* |
1374 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1375 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1376 | * that function for the gory details. -acme | |
1da177e4 | 1377 | */ |
1da177e4 LT |
1378 | |
1379 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1380 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1381 | Sync it now. |
1382 | */ | |
d83d8461 | 1383 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1384 | |
1385 | return newsk; | |
1386 | } | |
1387 | ||
78d15e82 | 1388 | treq = inet6_rsk(req); |
1da177e4 LT |
1389 | opt = np->opt; |
1390 | ||
1391 | if (sk_acceptq_is_full(sk)) | |
1392 | goto out_overflow; | |
1393 | ||
1da177e4 LT |
1394 | if (dst == NULL) { |
1395 | struct in6_addr *final_p = NULL, final; | |
1396 | struct flowi fl; | |
1397 | ||
1398 | memset(&fl, 0, sizeof(fl)); | |
1399 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1400 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
1401 | if (opt && opt->srcrt) { |
1402 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1403 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1404 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1405 | final_p = &final; | |
1406 | } | |
2e6599cb | 1407 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1408 | fl.oif = sk->sk_bound_dev_if; |
51953d5b | 1409 | fl.mark = sk->sk_mark; |
2e6599cb | 1410 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
fd507037 | 1411 | fl.fl_ip_sport = inet_rsk(req)->loc_port; |
4237c75c | 1412 | security_req_classify_flow(req, &fl); |
1da177e4 LT |
1413 | |
1414 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1415 | goto out; | |
1416 | ||
1417 | if (final_p) | |
1418 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1419 | ||
52479b62 | 1420 | if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) |
1da177e4 | 1421 | goto out; |
1ab1457c | 1422 | } |
1da177e4 LT |
1423 | |
1424 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1425 | if (newsk == NULL) | |
1426 | goto out; | |
1427 | ||
e6848976 ACM |
1428 | /* |
1429 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1430 | * count here, tcp_create_openreq_child now does this for us, see the | |
1431 | * comment in that function for the gory details. -acme | |
1432 | */ | |
1da177e4 | 1433 | |
59eed279 | 1434 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1435 | __ip6_dst_store(newsk, dst, NULL, NULL); |
1da177e4 LT |
1436 | |
1437 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1438 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1439 | ||
1440 | newtp = tcp_sk(newsk); | |
1441 | newinet = inet_sk(newsk); | |
1442 | newnp = inet6_sk(newsk); | |
1443 | ||
1444 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1445 | ||
2e6599cb ACM |
1446 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1447 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1448 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1449 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 | 1450 | |
1ab1457c | 1451 | /* Now IPv6 options... |
1da177e4 LT |
1452 | |
1453 | First: no IPv4 options. | |
1454 | */ | |
1455 | newinet->opt = NULL; | |
d35690be | 1456 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1457 | |
1458 | /* Clone RX bits */ | |
1459 | newnp->rxopt.all = np->rxopt.all; | |
1460 | ||
1461 | /* Clone pktoptions received with SYN */ | |
1462 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1463 | if (treq->pktopts != NULL) { |
1464 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1465 | kfree_skb(treq->pktopts); | |
1466 | treq->pktopts = NULL; | |
1da177e4 LT |
1467 | if (newnp->pktoptions) |
1468 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1469 | } | |
1470 | newnp->opt = NULL; | |
505cbfc5 | 1471 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1472 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
1473 | |
1474 | /* Clone native IPv6 options from listening socket (if any) | |
1475 | ||
1476 | Yes, keeping reference count would be much more clever, | |
1477 | but we make one more one thing there: reattach optmem | |
1478 | to newsk. | |
1479 | */ | |
1480 | if (opt) { | |
1481 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1482 | if (opt != np->opt) | |
1483 | sock_kfree_s(sk, opt, opt->tot_len); | |
1484 | } | |
1485 | ||
d83d8461 | 1486 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1487 | if (newnp->opt) |
d83d8461 ACM |
1488 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1489 | newnp->opt->opt_flen); | |
1da177e4 | 1490 | |
5d424d5a | 1491 | tcp_mtup_init(newsk); |
1da177e4 LT |
1492 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1493 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1494 | tcp_initialize_rcv_mss(newsk); | |
1495 | ||
c720c7e8 ED |
1496 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1497 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1498 | |
cfb6eeb4 YH |
1499 | #ifdef CONFIG_TCP_MD5SIG |
1500 | /* Copy over the MD5 key from the original socket */ | |
1501 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1502 | /* We're using one, so create a matching key | |
1503 | * on the newsk structure. If we fail to get | |
1504 | * memory, then we end up not copying the key | |
1505 | * across. Shucks. | |
1506 | */ | |
af879cc7 ACM |
1507 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1508 | if (newkey != NULL) | |
e547bc1e | 1509 | tcp_v6_md5_do_add(newsk, &newnp->daddr, |
cfb6eeb4 | 1510 | newkey, key->keylen); |
cfb6eeb4 YH |
1511 | } |
1512 | #endif | |
1513 | ||
9327f705 | 1514 | __inet6_hash(newsk, NULL); |
e56d8b8a | 1515 | __inet_inherit_port(sk, newsk); |
1da177e4 LT |
1516 | |
1517 | return newsk; | |
1518 | ||
1519 | out_overflow: | |
de0744af | 1520 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
1da177e4 | 1521 | out: |
de0744af | 1522 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1523 | if (opt && opt != np->opt) |
1524 | sock_kfree_s(sk, opt, opt->tot_len); | |
1525 | dst_release(dst); | |
1526 | return NULL; | |
1527 | } | |
1528 | ||
b51655b9 | 1529 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1530 | { |
84fa7933 | 1531 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
684f2176 | 1532 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1533 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1534 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1535 | return 0; |
fb286bb2 | 1536 | } |
1da177e4 | 1537 | } |
fb286bb2 | 1538 | |
684f2176 | 1539 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
0660e03f ACM |
1540 | &ipv6_hdr(skb)->saddr, |
1541 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1542 | |
1da177e4 | 1543 | if (skb->len <= 76) { |
fb286bb2 | 1544 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1545 | } |
1546 | return 0; | |
1547 | } | |
1548 | ||
1549 | /* The socket must have it's spinlock held when we get | |
1550 | * here. | |
1551 | * | |
1552 | * We have a potential double-lock case here, so even when | |
1553 | * doing backlog processing we use the BH locking scheme. | |
1554 | * This is because we cannot sleep with the original spinlock | |
1555 | * held. | |
1556 | */ | |
1557 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1558 | { | |
1559 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1560 | struct tcp_sock *tp; | |
1561 | struct sk_buff *opt_skb = NULL; | |
1562 | ||
1563 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1564 | goes to IPv4 receive handler and backlogged. | |
1565 | From backlog it always goes here. Kerboom... | |
1566 | Fortunately, tcp_rcv_established and rcv_established | |
1567 | handle them correctly, but it is not case with | |
1568 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1569 | */ | |
1570 | ||
1571 | if (skb->protocol == htons(ETH_P_IP)) | |
1572 | return tcp_v4_do_rcv(sk, skb); | |
1573 | ||
cfb6eeb4 YH |
1574 | #ifdef CONFIG_TCP_MD5SIG |
1575 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1576 | goto discard; | |
1577 | #endif | |
1578 | ||
fda9ef5d | 1579 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1580 | goto discard; |
1581 | ||
1582 | /* | |
1583 | * socket locking is here for SMP purposes as backlog rcv | |
1584 | * is currently called with bh processing disabled. | |
1585 | */ | |
1586 | ||
1587 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1588 | ||
1589 | Yes, guys, it is the only place in our code, where we | |
1590 | may make it not affecting IPv4. | |
1591 | The rest of code is protocol independent, | |
1592 | and I do not like idea to uglify IPv4. | |
1593 | ||
1594 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1595 | looks not very well thought. For now we latch | |
1596 | options, received in the last packet, enqueued | |
1597 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1598 | --ANK (980728) |
1da177e4 LT |
1599 | */ |
1600 | if (np->rxopt.all) | |
1601 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1602 | ||
1603 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1604 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1605 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1606 | goto reset; |
1607 | TCP_CHECK_TIMER(sk); | |
1608 | if (opt_skb) | |
1609 | goto ipv6_pktoptions; | |
1610 | return 0; | |
1611 | } | |
1612 | ||
ab6a5bb6 | 1613 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1614 | goto csum_err; |
1615 | ||
1ab1457c | 1616 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1617 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1618 | if (!nsk) | |
1619 | goto discard; | |
1620 | ||
1621 | /* | |
1622 | * Queue it on the new socket if the new socket is active, | |
1623 | * otherwise we just shortcircuit this and continue with | |
1624 | * the new socket.. | |
1625 | */ | |
1ab1457c | 1626 | if(nsk != sk) { |
1da177e4 LT |
1627 | if (tcp_child_process(sk, nsk, skb)) |
1628 | goto reset; | |
1629 | if (opt_skb) | |
1630 | __kfree_skb(opt_skb); | |
1631 | return 0; | |
1632 | } | |
1633 | } | |
1634 | ||
1635 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1636 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1637 | goto reset; |
1638 | TCP_CHECK_TIMER(sk); | |
1639 | if (opt_skb) | |
1640 | goto ipv6_pktoptions; | |
1641 | return 0; | |
1642 | ||
1643 | reset: | |
cfb6eeb4 | 1644 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1645 | discard: |
1646 | if (opt_skb) | |
1647 | __kfree_skb(opt_skb); | |
1648 | kfree_skb(skb); | |
1649 | return 0; | |
1650 | csum_err: | |
63231bdd | 1651 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1652 | goto discard; |
1653 | ||
1654 | ||
1655 | ipv6_pktoptions: | |
1656 | /* Do you ask, what is it? | |
1657 | ||
1658 | 1. skb was enqueued by tcp. | |
1659 | 2. skb is added to tail of read queue, rather than out of order. | |
1660 | 3. socket is not in passive state. | |
1661 | 4. Finally, it really contains options, which user wants to receive. | |
1662 | */ | |
1663 | tp = tcp_sk(sk); | |
1664 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1665 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1666 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1667 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1668 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1669 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
1da177e4 LT |
1670 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1671 | skb_set_owner_r(opt_skb, sk); | |
1672 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1673 | } else { | |
1674 | __kfree_skb(opt_skb); | |
1675 | opt_skb = xchg(&np->pktoptions, NULL); | |
1676 | } | |
1677 | } | |
1678 | ||
800d55f1 | 1679 | kfree_skb(opt_skb); |
1da177e4 LT |
1680 | return 0; |
1681 | } | |
1682 | ||
e5bbef20 | 1683 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1684 | { |
1ab1457c | 1685 | struct tcphdr *th; |
e802af9c | 1686 | struct ipv6hdr *hdr; |
1da177e4 LT |
1687 | struct sock *sk; |
1688 | int ret; | |
a86b1e30 | 1689 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1690 | |
1691 | if (skb->pkt_type != PACKET_HOST) | |
1692 | goto discard_it; | |
1693 | ||
1694 | /* | |
1695 | * Count it even if it's bad. | |
1696 | */ | |
63231bdd | 1697 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1698 | |
1699 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1700 | goto discard_it; | |
1701 | ||
aa8223c7 | 1702 | th = tcp_hdr(skb); |
1da177e4 LT |
1703 | |
1704 | if (th->doff < sizeof(struct tcphdr)/4) | |
1705 | goto bad_packet; | |
1706 | if (!pskb_may_pull(skb, th->doff*4)) | |
1707 | goto discard_it; | |
1708 | ||
60476372 | 1709 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1da177e4 LT |
1710 | goto bad_packet; |
1711 | ||
aa8223c7 | 1712 | th = tcp_hdr(skb); |
e802af9c | 1713 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
1714 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1715 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1716 | skb->len - th->doff*4); | |
1717 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1718 | TCP_SKB_CB(skb)->when = 0; | |
e802af9c | 1719 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(hdr); |
1da177e4 LT |
1720 | TCP_SKB_CB(skb)->sacked = 0; |
1721 | ||
9a1f27c4 | 1722 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1723 | if (!sk) |
1724 | goto no_tcp_socket; | |
1725 | ||
1726 | process: | |
1727 | if (sk->sk_state == TCP_TIME_WAIT) | |
1728 | goto do_time_wait; | |
1729 | ||
e802af9c SH |
1730 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1731 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1732 | goto discard_and_relse; | |
1733 | } | |
1734 | ||
1da177e4 LT |
1735 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1736 | goto discard_and_relse; | |
1737 | ||
fda9ef5d | 1738 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1739 | goto discard_and_relse; |
1740 | ||
1741 | skb->dev = NULL; | |
1742 | ||
293b9c42 | 1743 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1744 | ret = 0; |
1745 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1746 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1747 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a | 1748 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
f67b4599 | 1749 | tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY); |
1ab1457c YH |
1750 | if (tp->ucopy.dma_chan) |
1751 | ret = tcp_v6_do_rcv(sk, skb); | |
1752 | else | |
1a2449a8 CL |
1753 | #endif |
1754 | { | |
1755 | if (!tcp_prequeue(sk, skb)) | |
1756 | ret = tcp_v6_do_rcv(sk, skb); | |
1757 | } | |
6cce09f8 | 1758 | } else if (unlikely(sk_add_backlog(sk, skb))) { |
6b03a53a | 1759 | bh_unlock_sock(sk); |
6cce09f8 | 1760 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1761 | goto discard_and_relse; |
1762 | } | |
1da177e4 LT |
1763 | bh_unlock_sock(sk); |
1764 | ||
1765 | sock_put(sk); | |
1766 | return ret ? -1 : 0; | |
1767 | ||
1768 | no_tcp_socket: | |
1769 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1770 | goto discard_it; | |
1771 | ||
1772 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1773 | bad_packet: | |
63231bdd | 1774 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1775 | } else { |
cfb6eeb4 | 1776 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1777 | } |
1778 | ||
1779 | discard_it: | |
1780 | ||
1781 | /* | |
1782 | * Discard frame | |
1783 | */ | |
1784 | ||
1785 | kfree_skb(skb); | |
1786 | return 0; | |
1787 | ||
1788 | discard_and_relse: | |
1789 | sock_put(sk); | |
1790 | goto discard_it; | |
1791 | ||
1792 | do_time_wait: | |
1793 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1794 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1795 | goto discard_it; |
1796 | } | |
1797 | ||
1798 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
63231bdd | 1799 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
9469c7b4 | 1800 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1801 | goto discard_it; |
1802 | } | |
1803 | ||
9469c7b4 | 1804 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1805 | case TCP_TW_SYN: |
1806 | { | |
1807 | struct sock *sk2; | |
1808 | ||
c346dca1 | 1809 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
0660e03f | 1810 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1811 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1812 | if (sk2 != NULL) { |
295ff7ed ACM |
1813 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1814 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1815 | inet_twsk_put(tw); | |
1da177e4 LT |
1816 | sk = sk2; |
1817 | goto process; | |
1818 | } | |
1819 | /* Fall through to ACK */ | |
1820 | } | |
1821 | case TCP_TW_ACK: | |
1822 | tcp_v6_timewait_ack(sk, skb); | |
1823 | break; | |
1824 | case TCP_TW_RST: | |
1825 | goto no_tcp_socket; | |
1826 | case TCP_TW_SUCCESS:; | |
1827 | } | |
1828 | goto discard_it; | |
1829 | } | |
1830 | ||
1da177e4 LT |
1831 | static int tcp_v6_remember_stamp(struct sock *sk) |
1832 | { | |
1833 | /* Alas, not yet... */ | |
1834 | return 0; | |
1835 | } | |
1836 | ||
3b401a81 | 1837 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1838 | .queue_xmit = inet6_csk_xmit, |
1839 | .send_check = tcp_v6_send_check, | |
1840 | .rebuild_header = inet6_sk_rebuild_header, | |
1841 | .conn_request = tcp_v6_conn_request, | |
1842 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1843 | .remember_stamp = tcp_v6_remember_stamp, | |
1844 | .net_header_len = sizeof(struct ipv6hdr), | |
1845 | .setsockopt = ipv6_setsockopt, | |
1846 | .getsockopt = ipv6_getsockopt, | |
1847 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1848 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1849 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1850 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1851 | .compat_setsockopt = compat_ipv6_setsockopt, |
1852 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1853 | #endif |
1da177e4 LT |
1854 | }; |
1855 | ||
cfb6eeb4 | 1856 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1857 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1858 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1859 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 YH |
1860 | .md5_add = tcp_v6_md5_add_func, |
1861 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1862 | }; |
a928630a | 1863 | #endif |
cfb6eeb4 | 1864 | |
1da177e4 LT |
1865 | /* |
1866 | * TCP over IPv4 via INET6 API | |
1867 | */ | |
1868 | ||
3b401a81 | 1869 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1870 | .queue_xmit = ip_queue_xmit, |
1871 | .send_check = tcp_v4_send_check, | |
1872 | .rebuild_header = inet_sk_rebuild_header, | |
1873 | .conn_request = tcp_v6_conn_request, | |
1874 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1875 | .remember_stamp = tcp_v4_remember_stamp, | |
1876 | .net_header_len = sizeof(struct iphdr), | |
1877 | .setsockopt = ipv6_setsockopt, | |
1878 | .getsockopt = ipv6_getsockopt, | |
1879 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1880 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1881 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1882 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1883 | .compat_setsockopt = compat_ipv6_setsockopt, |
1884 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1885 | #endif |
1da177e4 LT |
1886 | }; |
1887 | ||
cfb6eeb4 | 1888 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1889 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1890 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1891 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 YH |
1892 | .md5_add = tcp_v6_md5_add_func, |
1893 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1894 | }; |
a928630a | 1895 | #endif |
cfb6eeb4 | 1896 | |
1da177e4 LT |
1897 | /* NOTE: A lot of things set to zero explicitly by call to |
1898 | * sk_alloc() so need not be done here. | |
1899 | */ | |
1900 | static int tcp_v6_init_sock(struct sock *sk) | |
1901 | { | |
6687e988 | 1902 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1903 | struct tcp_sock *tp = tcp_sk(sk); |
1904 | ||
1905 | skb_queue_head_init(&tp->out_of_order_queue); | |
1906 | tcp_init_xmit_timers(sk); | |
1907 | tcp_prequeue_init(tp); | |
1908 | ||
6687e988 | 1909 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1910 | tp->mdev = TCP_TIMEOUT_INIT; |
1911 | ||
1912 | /* So many TCP implementations out there (incorrectly) count the | |
1913 | * initial SYN frame in their delayed-ACK and congestion control | |
1914 | * algorithms that we must have the following bandaid to talk | |
1915 | * efficiently to them. -DaveM | |
1916 | */ | |
1917 | tp->snd_cwnd = 2; | |
1918 | ||
1919 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1920 | * initialization of these values. | |
1921 | */ | |
0b6a05c1 | 1922 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; |
1da177e4 | 1923 | tp->snd_cwnd_clamp = ~0; |
bee7ca9e | 1924 | tp->mss_cache = TCP_MSS_DEFAULT; |
1da177e4 LT |
1925 | |
1926 | tp->reordering = sysctl_tcp_reordering; | |
1927 | ||
1928 | sk->sk_state = TCP_CLOSE; | |
1929 | ||
8292a17a | 1930 | icsk->icsk_af_ops = &ipv6_specific; |
6687e988 | 1931 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
d83d8461 | 1932 | icsk->icsk_sync_mss = tcp_sync_mss; |
1da177e4 LT |
1933 | sk->sk_write_space = sk_stream_write_space; |
1934 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1935 | ||
cfb6eeb4 YH |
1936 | #ifdef CONFIG_TCP_MD5SIG |
1937 | tp->af_specific = &tcp_sock_ipv6_specific; | |
1938 | #endif | |
1939 | ||
435cf559 WAS |
1940 | /* TCP Cookie Transactions */ |
1941 | if (sysctl_tcp_cookie_size > 0) { | |
1942 | /* Default, cookies without s_data_payload. */ | |
1943 | tp->cookie_values = | |
1944 | kzalloc(sizeof(*tp->cookie_values), | |
1945 | sk->sk_allocation); | |
1946 | if (tp->cookie_values != NULL) | |
1947 | kref_init(&tp->cookie_values->kref); | |
1948 | } | |
1949 | /* Presumed zeroed, in order of appearance: | |
1950 | * cookie_in_always, cookie_out_never, | |
1951 | * s_data_constant, s_data_in, s_data_out | |
1952 | */ | |
1da177e4 LT |
1953 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
1954 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1955 | ||
eb4dea58 | 1956 | local_bh_disable(); |
1748376b | 1957 | percpu_counter_inc(&tcp_sockets_allocated); |
eb4dea58 | 1958 | local_bh_enable(); |
1da177e4 LT |
1959 | |
1960 | return 0; | |
1961 | } | |
1962 | ||
7d06b2e0 | 1963 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1964 | { |
cfb6eeb4 YH |
1965 | #ifdef CONFIG_TCP_MD5SIG |
1966 | /* Clean up the MD5 key list */ | |
1967 | if (tcp_sk(sk)->md5sig_info) | |
1968 | tcp_v6_clear_md5_list(sk); | |
1969 | #endif | |
1da177e4 | 1970 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1971 | inet6_destroy_sock(sk); |
1da177e4 LT |
1972 | } |
1973 | ||
952a10be | 1974 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1975 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1976 | static void get_openreq6(struct seq_file *seq, |
60236fdd | 1977 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 1978 | { |
1da177e4 | 1979 | int ttd = req->expires - jiffies; |
ca304b61 ACM |
1980 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1981 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1982 | |
1983 | if (ttd < 0) | |
1984 | ttd = 0; | |
1985 | ||
1da177e4 LT |
1986 | seq_printf(seq, |
1987 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1988 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1989 | i, | |
1990 | src->s6_addr32[0], src->s6_addr32[1], | |
1991 | src->s6_addr32[2], src->s6_addr32[3], | |
fd507037 | 1992 | ntohs(inet_rsk(req)->loc_port), |
1da177e4 LT |
1993 | dest->s6_addr32[0], dest->s6_addr32[1], |
1994 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1995 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1996 | TCP_SYN_RECV, |
1997 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
1998 | 1, /* timers active (only the expire timer) */ |
1999 | jiffies_to_clock_t(ttd), | |
1da177e4 LT |
2000 | req->retrans, |
2001 | uid, | |
1ab1457c | 2002 | 0, /* non standard timer */ |
1da177e4 LT |
2003 | 0, /* open_requests have no inode */ |
2004 | 0, req); | |
2005 | } | |
2006 | ||
2007 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
2008 | { | |
2009 | struct in6_addr *dest, *src; | |
2010 | __u16 destp, srcp; | |
2011 | int timer_active; | |
2012 | unsigned long timer_expires; | |
2013 | struct inet_sock *inet = inet_sk(sp); | |
2014 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 2015 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
2016 | struct ipv6_pinfo *np = inet6_sk(sp); |
2017 | ||
2018 | dest = &np->daddr; | |
2019 | src = &np->rcv_saddr; | |
c720c7e8 ED |
2020 | destp = ntohs(inet->inet_dport); |
2021 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
2022 | |
2023 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 2024 | timer_active = 1; |
463c84b9 ACM |
2025 | timer_expires = icsk->icsk_timeout; |
2026 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 2027 | timer_active = 4; |
463c84b9 | 2028 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
2029 | } else if (timer_pending(&sp->sk_timer)) { |
2030 | timer_active = 2; | |
2031 | timer_expires = sp->sk_timer.expires; | |
2032 | } else { | |
2033 | timer_active = 0; | |
2034 | timer_expires = jiffies; | |
2035 | } | |
2036 | ||
2037 | seq_printf(seq, | |
2038 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
7be87351 | 2039 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n", |
1da177e4 LT |
2040 | i, |
2041 | src->s6_addr32[0], src->s6_addr32[1], | |
2042 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2043 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2044 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 2045 | sp->sk_state, |
47da8ee6 SS |
2046 | tp->write_seq-tp->snd_una, |
2047 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 LT |
2048 | timer_active, |
2049 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 2050 | icsk->icsk_retransmits, |
1da177e4 | 2051 | sock_i_uid(sp), |
6687e988 | 2052 | icsk->icsk_probes_out, |
1da177e4 LT |
2053 | sock_i_ino(sp), |
2054 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
2055 | jiffies_to_clock_t(icsk->icsk_rto), |
2056 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 2057 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
0b6a05c1 IJ |
2058 | tp->snd_cwnd, |
2059 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh | |
1da177e4 LT |
2060 | ); |
2061 | } | |
2062 | ||
1ab1457c | 2063 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 2064 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
2065 | { |
2066 | struct in6_addr *dest, *src; | |
2067 | __u16 destp, srcp; | |
0fa1a53e | 2068 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
2069 | int ttd = tw->tw_ttd - jiffies; |
2070 | ||
2071 | if (ttd < 0) | |
2072 | ttd = 0; | |
2073 | ||
0fa1a53e ACM |
2074 | dest = &tw6->tw_v6_daddr; |
2075 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
2076 | destp = ntohs(tw->tw_dport); |
2077 | srcp = ntohs(tw->tw_sport); | |
2078 | ||
2079 | seq_printf(seq, | |
2080 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2081 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
2082 | i, | |
2083 | src->s6_addr32[0], src->s6_addr32[1], | |
2084 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2085 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2086 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2087 | tw->tw_substate, 0, 0, | |
2088 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2089 | atomic_read(&tw->tw_refcnt), tw); | |
2090 | } | |
2091 | ||
1da177e4 LT |
2092 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
2093 | { | |
2094 | struct tcp_iter_state *st; | |
2095 | ||
2096 | if (v == SEQ_START_TOKEN) { | |
2097 | seq_puts(seq, | |
2098 | " sl " | |
2099 | "local_address " | |
2100 | "remote_address " | |
2101 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2102 | " uid timeout inode\n"); | |
2103 | goto out; | |
2104 | } | |
2105 | st = seq->private; | |
2106 | ||
2107 | switch (st->state) { | |
2108 | case TCP_SEQ_STATE_LISTENING: | |
2109 | case TCP_SEQ_STATE_ESTABLISHED: | |
2110 | get_tcp6_sock(seq, v, st->num); | |
2111 | break; | |
2112 | case TCP_SEQ_STATE_OPENREQ: | |
2113 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
2114 | break; | |
2115 | case TCP_SEQ_STATE_TIME_WAIT: | |
2116 | get_timewait6_sock(seq, v, st->num); | |
2117 | break; | |
2118 | } | |
2119 | out: | |
2120 | return 0; | |
2121 | } | |
2122 | ||
1da177e4 | 2123 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
2124 | .name = "tcp6", |
2125 | .family = AF_INET6, | |
5f4472c5 DL |
2126 | .seq_fops = { |
2127 | .owner = THIS_MODULE, | |
2128 | }, | |
9427c4b3 DL |
2129 | .seq_ops = { |
2130 | .show = tcp6_seq_show, | |
2131 | }, | |
1da177e4 LT |
2132 | }; |
2133 | ||
2c8c1e72 | 2134 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 2135 | { |
6f8b13bc | 2136 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2137 | } |
2138 | ||
6f8b13bc | 2139 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2140 | { |
6f8b13bc | 2141 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2142 | } |
2143 | #endif | |
2144 | ||
2145 | struct proto tcpv6_prot = { | |
2146 | .name = "TCPv6", | |
2147 | .owner = THIS_MODULE, | |
2148 | .close = tcp_close, | |
2149 | .connect = tcp_v6_connect, | |
2150 | .disconnect = tcp_disconnect, | |
463c84b9 | 2151 | .accept = inet_csk_accept, |
1da177e4 LT |
2152 | .ioctl = tcp_ioctl, |
2153 | .init = tcp_v6_init_sock, | |
2154 | .destroy = tcp_v6_destroy_sock, | |
2155 | .shutdown = tcp_shutdown, | |
2156 | .setsockopt = tcp_setsockopt, | |
2157 | .getsockopt = tcp_getsockopt, | |
1da177e4 LT |
2158 | .recvmsg = tcp_recvmsg, |
2159 | .backlog_rcv = tcp_v6_do_rcv, | |
2160 | .hash = tcp_v6_hash, | |
ab1e0a13 ACM |
2161 | .unhash = inet_unhash, |
2162 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2163 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2164 | .sockets_allocated = &tcp_sockets_allocated, | |
2165 | .memory_allocated = &tcp_memory_allocated, | |
2166 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2167 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2168 | .sysctl_mem = sysctl_tcp_mem, |
2169 | .sysctl_wmem = sysctl_tcp_wmem, | |
2170 | .sysctl_rmem = sysctl_tcp_rmem, | |
2171 | .max_header = MAX_TCP_HEADER, | |
2172 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 2173 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 2174 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2175 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2176 | .h.hashinfo = &tcp_hashinfo, |
543d9cfe ACM |
2177 | #ifdef CONFIG_COMPAT |
2178 | .compat_setsockopt = compat_tcp_setsockopt, | |
2179 | .compat_getsockopt = compat_tcp_getsockopt, | |
2180 | #endif | |
1da177e4 LT |
2181 | }; |
2182 | ||
41135cc8 | 2183 | static const struct inet6_protocol tcpv6_protocol = { |
1da177e4 LT |
2184 | .handler = tcp_v6_rcv, |
2185 | .err_handler = tcp_v6_err, | |
a430a43d | 2186 | .gso_send_check = tcp_v6_gso_send_check, |
adcfc7d0 | 2187 | .gso_segment = tcp_tso_segment, |
684f2176 HX |
2188 | .gro_receive = tcp6_gro_receive, |
2189 | .gro_complete = tcp6_gro_complete, | |
1da177e4 LT |
2190 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
2191 | }; | |
2192 | ||
1da177e4 LT |
2193 | static struct inet_protosw tcpv6_protosw = { |
2194 | .type = SOCK_STREAM, | |
2195 | .protocol = IPPROTO_TCP, | |
2196 | .prot = &tcpv6_prot, | |
2197 | .ops = &inet6_stream_ops, | |
1da177e4 | 2198 | .no_check = 0, |
d83d8461 ACM |
2199 | .flags = INET_PROTOSW_PERMANENT | |
2200 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2201 | }; |
2202 | ||
2c8c1e72 | 2203 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 2204 | { |
5677242f DL |
2205 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2206 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2207 | } |
2208 | ||
2c8c1e72 | 2209 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 2210 | { |
5677242f | 2211 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
2212 | } |
2213 | ||
2c8c1e72 | 2214 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
2215 | { |
2216 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
2217 | } |
2218 | ||
2219 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
2220 | .init = tcpv6_net_init, |
2221 | .exit = tcpv6_net_exit, | |
2222 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
2223 | }; |
2224 | ||
7f4e4868 | 2225 | int __init tcpv6_init(void) |
1da177e4 | 2226 | { |
7f4e4868 DL |
2227 | int ret; |
2228 | ||
2229 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2230 | if (ret) | |
2231 | goto out; | |
2232 | ||
1da177e4 | 2233 | /* register inet6 protocol */ |
7f4e4868 DL |
2234 | ret = inet6_register_protosw(&tcpv6_protosw); |
2235 | if (ret) | |
2236 | goto out_tcpv6_protocol; | |
2237 | ||
93ec926b | 2238 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2239 | if (ret) |
2240 | goto out_tcpv6_protosw; | |
2241 | out: | |
2242 | return ret; | |
ae0f7d5f | 2243 | |
7f4e4868 DL |
2244 | out_tcpv6_protocol: |
2245 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2246 | out_tcpv6_protosw: | |
2247 | inet6_unregister_protosw(&tcpv6_protosw); | |
2248 | goto out; | |
2249 | } | |
2250 | ||
09f7709f | 2251 | void tcpv6_exit(void) |
7f4e4868 | 2252 | { |
93ec926b | 2253 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2254 | inet6_unregister_protosw(&tcpv6_protosw); |
2255 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2256 | } |