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); | |
1da177e4 | 78 | |
3b401a81 SH |
79 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
80 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 81 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
82 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
83 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
84 | #else |
85 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
86 | struct in6_addr *addr) | |
87 | { | |
88 | return NULL; | |
89 | } | |
a928630a | 90 | #endif |
1da177e4 | 91 | |
1da177e4 LT |
92 | static void tcp_v6_hash(struct sock *sk) |
93 | { | |
94 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 95 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
96 | tcp_prot.hash(sk); |
97 | return; | |
98 | } | |
99 | local_bh_disable(); | |
9327f705 | 100 | __inet6_hash(sk, NULL); |
1da177e4 LT |
101 | local_bh_enable(); |
102 | } | |
103 | } | |
104 | ||
684f2176 | 105 | static __inline__ __sum16 tcp_v6_check(int len, |
1ab1457c YH |
106 | struct in6_addr *saddr, |
107 | struct in6_addr *daddr, | |
868c86bc | 108 | __wsum base) |
1da177e4 LT |
109 | { |
110 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
111 | } | |
112 | ||
a94f723d | 113 | static __u32 tcp_v6_init_sequence(struct sk_buff *skb) |
1da177e4 | 114 | { |
0660e03f ACM |
115 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
116 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
117 | tcp_hdr(skb)->dest, |
118 | tcp_hdr(skb)->source); | |
1da177e4 LT |
119 | } |
120 | ||
1ab1457c | 121 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
122 | int addr_len) |
123 | { | |
124 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 125 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 126 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
127 | struct ipv6_pinfo *np = inet6_sk(sk); |
128 | struct tcp_sock *tp = tcp_sk(sk); | |
129 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
130 | struct flowi fl; | |
131 | struct dst_entry *dst; | |
132 | int addr_type; | |
133 | int err; | |
134 | ||
1ab1457c | 135 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
136 | return -EINVAL; |
137 | ||
1ab1457c | 138 | if (usin->sin6_family != AF_INET6) |
1da177e4 LT |
139 | return(-EAFNOSUPPORT); |
140 | ||
141 | memset(&fl, 0, sizeof(fl)); | |
142 | ||
143 | if (np->sndflow) { | |
144 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
145 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
146 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
147 | struct ip6_flowlabel *flowlabel; | |
148 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
149 | if (flowlabel == NULL) | |
150 | return -EINVAL; | |
151 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
152 | fl6_sock_release(flowlabel); | |
153 | } | |
154 | } | |
155 | ||
156 | /* | |
1ab1457c YH |
157 | * connect() to INADDR_ANY means loopback (BSD'ism). |
158 | */ | |
159 | ||
160 | if(ipv6_addr_any(&usin->sin6_addr)) | |
161 | usin->sin6_addr.s6_addr[15] = 0x1; | |
1da177e4 LT |
162 | |
163 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
164 | ||
165 | if(addr_type & IPV6_ADDR_MULTICAST) | |
166 | return -ENETUNREACH; | |
167 | ||
168 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
169 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
170 | usin->sin6_scope_id) { | |
171 | /* If interface is set while binding, indices | |
172 | * must coincide. | |
173 | */ | |
174 | if (sk->sk_bound_dev_if && | |
175 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
176 | return -EINVAL; | |
177 | ||
178 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
179 | } | |
180 | ||
181 | /* Connect to link-local address requires an interface */ | |
182 | if (!sk->sk_bound_dev_if) | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
186 | if (tp->rx_opt.ts_recent_stamp && | |
187 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
188 | tp->rx_opt.ts_recent = 0; | |
189 | tp->rx_opt.ts_recent_stamp = 0; | |
190 | tp->write_seq = 0; | |
191 | } | |
192 | ||
193 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
194 | np->flow_label = fl.fl6_flowlabel; | |
195 | ||
196 | /* | |
197 | * TCP over IPv4 | |
198 | */ | |
199 | ||
200 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 201 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
202 | struct sockaddr_in sin; |
203 | ||
204 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
205 | ||
206 | if (__ipv6_only_sock(sk)) | |
207 | return -ENETUNREACH; | |
208 | ||
209 | sin.sin_family = AF_INET; | |
210 | sin.sin_port = usin->sin6_port; | |
211 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
212 | ||
d83d8461 | 213 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 214 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
215 | #ifdef CONFIG_TCP_MD5SIG |
216 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
217 | #endif | |
1da177e4 LT |
218 | |
219 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
220 | ||
221 | if (err) { | |
d83d8461 ACM |
222 | icsk->icsk_ext_hdr_len = exthdrlen; |
223 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 224 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
225 | #ifdef CONFIG_TCP_MD5SIG |
226 | tp->af_specific = &tcp_sock_ipv6_specific; | |
227 | #endif | |
1da177e4 LT |
228 | goto failure; |
229 | } else { | |
c720c7e8 ED |
230 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
231 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, | |
232 | &np->rcv_saddr); | |
1da177e4 LT |
233 | } |
234 | ||
235 | return err; | |
236 | } | |
237 | ||
238 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
239 | saddr = &np->rcv_saddr; | |
240 | ||
241 | fl.proto = IPPROTO_TCP; | |
242 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
243 | ipv6_addr_copy(&fl.fl6_src, | |
244 | (saddr ? saddr : &np->saddr)); | |
245 | fl.oif = sk->sk_bound_dev_if; | |
51953d5b | 246 | fl.mark = sk->sk_mark; |
1da177e4 | 247 | fl.fl_ip_dport = usin->sin6_port; |
c720c7e8 | 248 | fl.fl_ip_sport = inet->inet_sport; |
1da177e4 LT |
249 | |
250 | if (np->opt && np->opt->srcrt) { | |
251 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
252 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
253 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
254 | final_p = &final; | |
255 | } | |
256 | ||
beb8d13b VY |
257 | security_sk_classify_flow(sk, &fl); |
258 | ||
1da177e4 LT |
259 | err = ip6_dst_lookup(sk, &dst, &fl); |
260 | if (err) | |
261 | goto failure; | |
262 | if (final_p) | |
263 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
264 | ||
52479b62 AD |
265 | err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); |
266 | if (err < 0) { | |
14e50e57 DM |
267 | if (err == -EREMOTE) |
268 | err = ip6_dst_blackhole(sk, &dst, &fl); | |
269 | if (err < 0) | |
270 | goto failure; | |
271 | } | |
1da177e4 LT |
272 | |
273 | if (saddr == NULL) { | |
274 | saddr = &fl.fl6_src; | |
275 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
276 | } | |
277 | ||
278 | /* set the source address */ | |
279 | ipv6_addr_copy(&np->saddr, saddr); | |
c720c7e8 | 280 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 281 | |
f83ef8c0 | 282 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 283 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 284 | |
d83d8461 | 285 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 286 | if (np->opt) |
d83d8461 ACM |
287 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
288 | np->opt->opt_nflen); | |
1da177e4 LT |
289 | |
290 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
291 | ||
c720c7e8 | 292 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
293 | |
294 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 295 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
296 | if (err) |
297 | goto late_failure; | |
298 | ||
299 | if (!tp->write_seq) | |
300 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
301 | np->daddr.s6_addr32, | |
c720c7e8 ED |
302 | inet->inet_sport, |
303 | inet->inet_dport); | |
1da177e4 LT |
304 | |
305 | err = tcp_connect(sk); | |
306 | if (err) | |
307 | goto late_failure; | |
308 | ||
309 | return 0; | |
310 | ||
311 | late_failure: | |
312 | tcp_set_state(sk, TCP_CLOSE); | |
313 | __sk_dst_reset(sk); | |
314 | failure: | |
c720c7e8 | 315 | inet->inet_dport = 0; |
1da177e4 LT |
316 | sk->sk_route_caps = 0; |
317 | return err; | |
318 | } | |
319 | ||
320 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 321 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 LT |
322 | { |
323 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
505cbfc5 | 324 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
325 | struct ipv6_pinfo *np; |
326 | struct sock *sk; | |
327 | int err; | |
1ab1457c | 328 | struct tcp_sock *tp; |
1da177e4 | 329 | __u32 seq; |
ca12a1a4 | 330 | struct net *net = dev_net(skb->dev); |
1da177e4 | 331 | |
ca12a1a4 | 332 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 333 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
334 | |
335 | if (sk == NULL) { | |
e41b5368 DL |
336 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
337 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
338 | return; |
339 | } | |
340 | ||
341 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 342 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
343 | return; |
344 | } | |
345 | ||
346 | bh_lock_sock(sk); | |
347 | if (sock_owned_by_user(sk)) | |
de0744af | 348 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
349 | |
350 | if (sk->sk_state == TCP_CLOSE) | |
351 | goto out; | |
352 | ||
353 | tp = tcp_sk(sk); | |
1ab1457c | 354 | seq = ntohl(th->seq); |
1da177e4 LT |
355 | if (sk->sk_state != TCP_LISTEN && |
356 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
de0744af | 357 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
358 | goto out; |
359 | } | |
360 | ||
361 | np = inet6_sk(sk); | |
362 | ||
363 | if (type == ICMPV6_PKT_TOOBIG) { | |
364 | struct dst_entry *dst = NULL; | |
365 | ||
366 | if (sock_owned_by_user(sk)) | |
367 | goto out; | |
368 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
369 | goto out; | |
370 | ||
371 | /* icmp should have updated the destination cache entry */ | |
372 | dst = __sk_dst_check(sk, np->dst_cookie); | |
373 | ||
374 | if (dst == NULL) { | |
375 | struct inet_sock *inet = inet_sk(sk); | |
376 | struct flowi fl; | |
377 | ||
378 | /* BUGGG_FUTURE: Again, it is not clear how | |
379 | to handle rthdr case. Ignore this complexity | |
380 | for now. | |
381 | */ | |
382 | memset(&fl, 0, sizeof(fl)); | |
383 | fl.proto = IPPROTO_TCP; | |
384 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
385 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
386 | fl.oif = sk->sk_bound_dev_if; | |
51953d5b | 387 | fl.mark = sk->sk_mark; |
c720c7e8 ED |
388 | fl.fl_ip_dport = inet->inet_dport; |
389 | fl.fl_ip_sport = inet->inet_sport; | |
beb8d13b | 390 | security_skb_classify_flow(skb, &fl); |
1da177e4 LT |
391 | |
392 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
393 | sk->sk_err_soft = -err; | |
394 | goto out; | |
395 | } | |
396 | ||
52479b62 | 397 | if ((err = xfrm_lookup(net, &dst, &fl, sk, 0)) < 0) { |
1da177e4 LT |
398 | sk->sk_err_soft = -err; |
399 | goto out; | |
400 | } | |
401 | ||
402 | } else | |
403 | dst_hold(dst); | |
404 | ||
d83d8461 | 405 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
1da177e4 LT |
406 | tcp_sync_mss(sk, dst_mtu(dst)); |
407 | tcp_simple_retransmit(sk); | |
408 | } /* else let the usual retransmit timer handle it */ | |
409 | dst_release(dst); | |
410 | goto out; | |
411 | } | |
412 | ||
413 | icmpv6_err_convert(type, code, &err); | |
414 | ||
60236fdd | 415 | /* Might be for an request_sock */ |
1da177e4 | 416 | switch (sk->sk_state) { |
60236fdd | 417 | struct request_sock *req, **prev; |
1da177e4 LT |
418 | case TCP_LISTEN: |
419 | if (sock_owned_by_user(sk)) | |
420 | goto out; | |
421 | ||
8129765a ACM |
422 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
423 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
424 | if (!req) |
425 | goto out; | |
426 | ||
427 | /* ICMPs are not backlogged, hence we cannot get | |
428 | * an established socket here. | |
429 | */ | |
547b792c | 430 | WARN_ON(req->sk != NULL); |
1da177e4 | 431 | |
2e6599cb | 432 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 433 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
434 | goto out; |
435 | } | |
436 | ||
463c84b9 | 437 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
438 | goto out; |
439 | ||
440 | case TCP_SYN_SENT: | |
441 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 442 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 443 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
444 | sk->sk_err = err; |
445 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
446 | ||
447 | tcp_done(sk); | |
448 | } else | |
449 | sk->sk_err_soft = err; | |
450 | goto out; | |
451 | } | |
452 | ||
453 | if (!sock_owned_by_user(sk) && np->recverr) { | |
454 | sk->sk_err = err; | |
455 | sk->sk_error_report(sk); | |
456 | } else | |
457 | sk->sk_err_soft = err; | |
458 | ||
459 | out: | |
460 | bh_unlock_sock(sk); | |
461 | sock_put(sk); | |
462 | } | |
463 | ||
464 | ||
e6b4d113 WAS |
465 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, |
466 | struct request_values *rvp) | |
1da177e4 | 467 | { |
ca304b61 | 468 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
469 | struct ipv6_pinfo *np = inet6_sk(sk); |
470 | struct sk_buff * skb; | |
471 | struct ipv6_txoptions *opt = NULL; | |
472 | struct in6_addr * final_p = NULL, final; | |
473 | struct flowi fl; | |
fd80eb94 | 474 | struct dst_entry *dst; |
1da177e4 LT |
475 | int err = -1; |
476 | ||
477 | memset(&fl, 0, sizeof(fl)); | |
478 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
479 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
480 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 481 | fl.fl6_flowlabel = 0; |
2e6599cb | 482 | fl.oif = treq->iif; |
51953d5b | 483 | fl.mark = sk->sk_mark; |
2e6599cb | 484 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
fd507037 | 485 | fl.fl_ip_sport = inet_rsk(req)->loc_port; |
4237c75c | 486 | security_req_classify_flow(req, &fl); |
1da177e4 | 487 | |
fd80eb94 DL |
488 | opt = np->opt; |
489 | if (opt && opt->srcrt) { | |
490 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
491 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
492 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
493 | final_p = &final; | |
1da177e4 LT |
494 | } |
495 | ||
fd80eb94 DL |
496 | err = ip6_dst_lookup(sk, &dst, &fl); |
497 | if (err) | |
498 | goto done; | |
499 | if (final_p) | |
500 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
52479b62 | 501 | if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) |
fd80eb94 DL |
502 | goto done; |
503 | ||
e6b4d113 | 504 | skb = tcp_make_synack(sk, dst, req, rvp); |
1da177e4 | 505 | if (skb) { |
aa8223c7 | 506 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 507 | |
684f2176 | 508 | th->check = tcp_v6_check(skb->len, |
2e6599cb | 509 | &treq->loc_addr, &treq->rmt_addr, |
07f0757a | 510 | csum_partial(th, skb->len, skb->csum)); |
1da177e4 | 511 | |
2e6599cb | 512 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 | 513 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
b9df3cb8 | 514 | err = net_xmit_eval(err); |
1da177e4 LT |
515 | } |
516 | ||
517 | done: | |
1ab1457c | 518 | if (opt && opt != np->opt) |
1da177e4 | 519 | sock_kfree_s(sk, opt, opt->tot_len); |
78b91042 | 520 | dst_release(dst); |
1da177e4 LT |
521 | return err; |
522 | } | |
523 | ||
72659ecc OP |
524 | static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req, |
525 | struct request_values *rvp) | |
526 | { | |
527 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); | |
528 | return tcp_v6_send_synack(sk, req, rvp); | |
529 | } | |
530 | ||
c6aefafb GG |
531 | static inline void syn_flood_warning(struct sk_buff *skb) |
532 | { | |
533 | #ifdef CONFIG_SYN_COOKIES | |
534 | if (sysctl_tcp_syncookies) | |
535 | printk(KERN_INFO | |
536 | "TCPv6: Possible SYN flooding on port %d. " | |
537 | "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest)); | |
538 | else | |
539 | #endif | |
540 | printk(KERN_INFO | |
541 | "TCPv6: Possible SYN flooding on port %d. " | |
542 | "Dropping request.\n", ntohs(tcp_hdr(skb)->dest)); | |
543 | } | |
544 | ||
60236fdd | 545 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 546 | { |
800d55f1 | 547 | kfree_skb(inet6_rsk(req)->pktopts); |
1da177e4 LT |
548 | } |
549 | ||
cfb6eeb4 YH |
550 | #ifdef CONFIG_TCP_MD5SIG |
551 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
552 | struct in6_addr *addr) | |
553 | { | |
554 | struct tcp_sock *tp = tcp_sk(sk); | |
555 | int i; | |
556 | ||
557 | BUG_ON(tp == NULL); | |
558 | ||
559 | if (!tp->md5sig_info || !tp->md5sig_info->entries6) | |
560 | return NULL; | |
561 | ||
562 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 563 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr)) |
f8ab18d2 | 564 | return &tp->md5sig_info->keys6[i].base; |
cfb6eeb4 YH |
565 | } |
566 | return NULL; | |
567 | } | |
568 | ||
569 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
570 | struct sock *addr_sk) | |
571 | { | |
572 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); | |
573 | } | |
574 | ||
575 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
576 | struct request_sock *req) | |
577 | { | |
578 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
579 | } | |
580 | ||
581 | static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer, | |
582 | char *newkey, u8 newkeylen) | |
583 | { | |
584 | /* Add key to the list */ | |
b0a713e9 | 585 | struct tcp_md5sig_key *key; |
cfb6eeb4 YH |
586 | struct tcp_sock *tp = tcp_sk(sk); |
587 | struct tcp6_md5sig_key *keys; | |
588 | ||
b0a713e9 | 589 | key = tcp_v6_md5_do_lookup(sk, peer); |
cfb6eeb4 YH |
590 | if (key) { |
591 | /* modify existing entry - just update that one */ | |
b0a713e9 MD |
592 | kfree(key->key); |
593 | key->key = newkey; | |
594 | key->keylen = newkeylen; | |
cfb6eeb4 YH |
595 | } else { |
596 | /* reallocate new list if current one is full. */ | |
597 | if (!tp->md5sig_info) { | |
598 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC); | |
599 | if (!tp->md5sig_info) { | |
600 | kfree(newkey); | |
601 | return -ENOMEM; | |
602 | } | |
3d7dbeac | 603 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 | 604 | } |
aa133076 | 605 | if (tcp_alloc_md5sig_pool(sk) == NULL) { |
aacbe8c8 YH |
606 | kfree(newkey); |
607 | return -ENOMEM; | |
608 | } | |
cfb6eeb4 YH |
609 | if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) { |
610 | keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) * | |
611 | (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC); | |
612 | ||
613 | if (!keys) { | |
614 | tcp_free_md5sig_pool(); | |
615 | kfree(newkey); | |
616 | return -ENOMEM; | |
617 | } | |
618 | ||
619 | if (tp->md5sig_info->entries6) | |
620 | memmove(keys, tp->md5sig_info->keys6, | |
621 | (sizeof (tp->md5sig_info->keys6[0]) * | |
622 | tp->md5sig_info->entries6)); | |
623 | ||
624 | kfree(tp->md5sig_info->keys6); | |
625 | tp->md5sig_info->keys6 = keys; | |
626 | tp->md5sig_info->alloced6++; | |
627 | } | |
628 | ||
629 | ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr, | |
630 | peer); | |
f8ab18d2 DM |
631 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey; |
632 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen; | |
cfb6eeb4 YH |
633 | |
634 | tp->md5sig_info->entries6++; | |
635 | } | |
636 | return 0; | |
637 | } | |
638 | ||
639 | static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk, | |
640 | u8 *newkey, __u8 newkeylen) | |
641 | { | |
642 | return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr, | |
643 | newkey, newkeylen); | |
644 | } | |
645 | ||
646 | static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer) | |
647 | { | |
648 | struct tcp_sock *tp = tcp_sk(sk); | |
649 | int i; | |
650 | ||
651 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 652 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) { |
cfb6eeb4 | 653 | /* Free the key */ |
f8ab18d2 | 654 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
655 | tp->md5sig_info->entries6--; |
656 | ||
657 | if (tp->md5sig_info->entries6 == 0) { | |
658 | kfree(tp->md5sig_info->keys6); | |
659 | tp->md5sig_info->keys6 = NULL; | |
ca983cef | 660 | tp->md5sig_info->alloced6 = 0; |
cfb6eeb4 YH |
661 | } else { |
662 | /* shrink the database */ | |
663 | if (tp->md5sig_info->entries6 != i) | |
664 | memmove(&tp->md5sig_info->keys6[i], | |
665 | &tp->md5sig_info->keys6[i+1], | |
666 | (tp->md5sig_info->entries6 - i) | |
667 | * sizeof (tp->md5sig_info->keys6[0])); | |
668 | } | |
77adefdc YH |
669 | tcp_free_md5sig_pool(); |
670 | return 0; | |
cfb6eeb4 YH |
671 | } |
672 | } | |
673 | return -ENOENT; | |
674 | } | |
675 | ||
676 | static void tcp_v6_clear_md5_list (struct sock *sk) | |
677 | { | |
678 | struct tcp_sock *tp = tcp_sk(sk); | |
679 | int i; | |
680 | ||
681 | if (tp->md5sig_info->entries6) { | |
682 | for (i = 0; i < tp->md5sig_info->entries6; i++) | |
f8ab18d2 | 683 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
684 | tp->md5sig_info->entries6 = 0; |
685 | tcp_free_md5sig_pool(); | |
686 | } | |
687 | ||
688 | kfree(tp->md5sig_info->keys6); | |
689 | tp->md5sig_info->keys6 = NULL; | |
690 | tp->md5sig_info->alloced6 = 0; | |
691 | ||
692 | if (tp->md5sig_info->entries4) { | |
693 | for (i = 0; i < tp->md5sig_info->entries4; i++) | |
f8ab18d2 | 694 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
695 | tp->md5sig_info->entries4 = 0; |
696 | tcp_free_md5sig_pool(); | |
697 | } | |
698 | ||
699 | kfree(tp->md5sig_info->keys4); | |
700 | tp->md5sig_info->keys4 = NULL; | |
701 | tp->md5sig_info->alloced4 = 0; | |
702 | } | |
703 | ||
704 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, | |
705 | int optlen) | |
706 | { | |
707 | struct tcp_md5sig cmd; | |
708 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
709 | u8 *newkey; | |
710 | ||
711 | if (optlen < sizeof(cmd)) | |
712 | return -EINVAL; | |
713 | ||
714 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
715 | return -EFAULT; | |
716 | ||
717 | if (sin6->sin6_family != AF_INET6) | |
718 | return -EINVAL; | |
719 | ||
720 | if (!cmd.tcpm_keylen) { | |
721 | if (!tcp_sk(sk)->md5sig_info) | |
722 | return -ENOENT; | |
e773e4fa | 723 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
cfb6eeb4 YH |
724 | return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]); |
725 | return tcp_v6_md5_do_del(sk, &sin6->sin6_addr); | |
726 | } | |
727 | ||
728 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
729 | return -EINVAL; | |
730 | ||
731 | if (!tcp_sk(sk)->md5sig_info) { | |
732 | struct tcp_sock *tp = tcp_sk(sk); | |
733 | struct tcp_md5sig_info *p; | |
734 | ||
735 | p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL); | |
736 | if (!p) | |
737 | return -ENOMEM; | |
738 | ||
739 | tp->md5sig_info = p; | |
3d7dbeac | 740 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 YH |
741 | } |
742 | ||
af879cc7 | 743 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
744 | if (!newkey) |
745 | return -ENOMEM; | |
e773e4fa | 746 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { |
cfb6eeb4 YH |
747 | return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3], |
748 | newkey, cmd.tcpm_keylen); | |
749 | } | |
750 | return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen); | |
751 | } | |
752 | ||
49a72dfb AL |
753 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
754 | struct in6_addr *daddr, | |
755 | struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 756 | { |
cfb6eeb4 | 757 | struct tcp6_pseudohdr *bp; |
49a72dfb | 758 | struct scatterlist sg; |
8d26d76d | 759 | |
cfb6eeb4 | 760 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 YH |
761 | /* 1. TCP pseudo-header (RFC2460) */ |
762 | ipv6_addr_copy(&bp->saddr, saddr); | |
763 | ipv6_addr_copy(&bp->daddr, daddr); | |
49a72dfb | 764 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 765 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 766 | |
49a72dfb AL |
767 | sg_init_one(&sg, bp, sizeof(*bp)); |
768 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
769 | } | |
c7da57a1 | 770 | |
49a72dfb AL |
771 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
772 | struct in6_addr *daddr, struct in6_addr *saddr, | |
773 | struct tcphdr *th) | |
774 | { | |
775 | struct tcp_md5sig_pool *hp; | |
776 | struct hash_desc *desc; | |
777 | ||
778 | hp = tcp_get_md5sig_pool(); | |
779 | if (!hp) | |
780 | goto clear_hash_noput; | |
781 | desc = &hp->md5_desc; | |
782 | ||
783 | if (crypto_hash_init(desc)) | |
784 | goto clear_hash; | |
785 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
786 | goto clear_hash; | |
787 | if (tcp_md5_hash_header(hp, th)) | |
788 | goto clear_hash; | |
789 | if (tcp_md5_hash_key(hp, key)) | |
790 | goto clear_hash; | |
791 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 792 | goto clear_hash; |
cfb6eeb4 | 793 | |
cfb6eeb4 | 794 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 795 | return 0; |
49a72dfb | 796 | |
cfb6eeb4 YH |
797 | clear_hash: |
798 | tcp_put_md5sig_pool(); | |
799 | clear_hash_noput: | |
800 | memset(md5_hash, 0, 16); | |
49a72dfb | 801 | return 1; |
cfb6eeb4 YH |
802 | } |
803 | ||
49a72dfb AL |
804 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
805 | struct sock *sk, struct request_sock *req, | |
806 | struct sk_buff *skb) | |
cfb6eeb4 YH |
807 | { |
808 | struct in6_addr *saddr, *daddr; | |
49a72dfb AL |
809 | struct tcp_md5sig_pool *hp; |
810 | struct hash_desc *desc; | |
811 | struct tcphdr *th = tcp_hdr(skb); | |
cfb6eeb4 YH |
812 | |
813 | if (sk) { | |
814 | saddr = &inet6_sk(sk)->saddr; | |
815 | daddr = &inet6_sk(sk)->daddr; | |
49a72dfb | 816 | } else if (req) { |
cfb6eeb4 YH |
817 | saddr = &inet6_rsk(req)->loc_addr; |
818 | daddr = &inet6_rsk(req)->rmt_addr; | |
49a72dfb AL |
819 | } else { |
820 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
821 | saddr = &ip6h->saddr; | |
822 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 823 | } |
49a72dfb AL |
824 | |
825 | hp = tcp_get_md5sig_pool(); | |
826 | if (!hp) | |
827 | goto clear_hash_noput; | |
828 | desc = &hp->md5_desc; | |
829 | ||
830 | if (crypto_hash_init(desc)) | |
831 | goto clear_hash; | |
832 | ||
833 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
834 | goto clear_hash; | |
835 | if (tcp_md5_hash_header(hp, th)) | |
836 | goto clear_hash; | |
837 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
838 | goto clear_hash; | |
839 | if (tcp_md5_hash_key(hp, key)) | |
840 | goto clear_hash; | |
841 | if (crypto_hash_final(desc, md5_hash)) | |
842 | goto clear_hash; | |
843 | ||
844 | tcp_put_md5sig_pool(); | |
845 | return 0; | |
846 | ||
847 | clear_hash: | |
848 | tcp_put_md5sig_pool(); | |
849 | clear_hash_noput: | |
850 | memset(md5_hash, 0, 16); | |
851 | return 1; | |
cfb6eeb4 YH |
852 | } |
853 | ||
854 | static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb) | |
855 | { | |
856 | __u8 *hash_location = NULL; | |
857 | struct tcp_md5sig_key *hash_expected; | |
0660e03f | 858 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
aa8223c7 | 859 | struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 860 | int genhash; |
cfb6eeb4 YH |
861 | u8 newhash[16]; |
862 | ||
863 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 864 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 865 | |
785957d3 DM |
866 | /* We've parsed the options - do we have a hash? */ |
867 | if (!hash_expected && !hash_location) | |
868 | return 0; | |
869 | ||
870 | if (hash_expected && !hash_location) { | |
871 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
872 | return 1; |
873 | } | |
874 | ||
785957d3 DM |
875 | if (!hash_expected && hash_location) { |
876 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
877 | return 1; |
878 | } | |
879 | ||
880 | /* check the signature */ | |
49a72dfb AL |
881 | genhash = tcp_v6_md5_hash_skb(newhash, |
882 | hash_expected, | |
883 | NULL, NULL, skb); | |
884 | ||
cfb6eeb4 YH |
885 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
886 | if (net_ratelimit()) { | |
5856b606 | 887 | printk(KERN_INFO "MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
cfb6eeb4 | 888 | genhash ? "failed" : "mismatch", |
0c6ce78a HH |
889 | &ip6h->saddr, ntohs(th->source), |
890 | &ip6h->daddr, ntohs(th->dest)); | |
cfb6eeb4 YH |
891 | } |
892 | return 1; | |
893 | } | |
894 | return 0; | |
895 | } | |
896 | #endif | |
897 | ||
c6aefafb | 898 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 899 | .family = AF_INET6, |
2e6599cb | 900 | .obj_size = sizeof(struct tcp6_request_sock), |
72659ecc | 901 | .rtx_syn_ack = tcp_v6_rtx_synack, |
60236fdd ACM |
902 | .send_ack = tcp_v6_reqsk_send_ack, |
903 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc OP |
904 | .send_reset = tcp_v6_send_reset, |
905 | .syn_ack_timeout = tcp_syn_ack_timeout, | |
1da177e4 LT |
906 | }; |
907 | ||
cfb6eeb4 | 908 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 909 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 910 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 911 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 912 | }; |
b6332e6c | 913 | #endif |
cfb6eeb4 | 914 | |
6d6ee43e ACM |
915 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
916 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
917 | .twsk_unique = tcp_twsk_unique, | |
cfb6eeb4 | 918 | .twsk_destructor= tcp_twsk_destructor, |
6d6ee43e ACM |
919 | }; |
920 | ||
8292a17a | 921 | static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) |
1da177e4 LT |
922 | { |
923 | struct ipv6_pinfo *np = inet6_sk(sk); | |
aa8223c7 | 924 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 925 | |
84fa7933 | 926 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1da177e4 | 927 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); |
663ead3b | 928 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 929 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 930 | } else { |
1ab1457c | 931 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, |
07f0757a | 932 | csum_partial(th, th->doff<<2, |
1da177e4 LT |
933 | skb->csum)); |
934 | } | |
935 | } | |
936 | ||
a430a43d HX |
937 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
938 | { | |
939 | struct ipv6hdr *ipv6h; | |
940 | struct tcphdr *th; | |
941 | ||
942 | if (!pskb_may_pull(skb, sizeof(*th))) | |
943 | return -EINVAL; | |
944 | ||
0660e03f | 945 | ipv6h = ipv6_hdr(skb); |
aa8223c7 | 946 | th = tcp_hdr(skb); |
a430a43d HX |
947 | |
948 | th->check = 0; | |
949 | th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, | |
950 | IPPROTO_TCP, 0); | |
663ead3b | 951 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 952 | skb->csum_offset = offsetof(struct tcphdr, check); |
84fa7933 | 953 | skb->ip_summed = CHECKSUM_PARTIAL; |
a430a43d HX |
954 | return 0; |
955 | } | |
1da177e4 | 956 | |
36990673 HX |
957 | static struct sk_buff **tcp6_gro_receive(struct sk_buff **head, |
958 | struct sk_buff *skb) | |
684f2176 | 959 | { |
36e7b1b8 | 960 | struct ipv6hdr *iph = skb_gro_network_header(skb); |
684f2176 HX |
961 | |
962 | switch (skb->ip_summed) { | |
963 | case CHECKSUM_COMPLETE: | |
86911732 | 964 | if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr, |
684f2176 HX |
965 | skb->csum)) { |
966 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
967 | break; | |
968 | } | |
969 | ||
970 | /* fall through */ | |
971 | case CHECKSUM_NONE: | |
972 | NAPI_GRO_CB(skb)->flush = 1; | |
973 | return NULL; | |
974 | } | |
975 | ||
976 | return tcp_gro_receive(head, skb); | |
977 | } | |
684f2176 | 978 | |
36990673 | 979 | static int tcp6_gro_complete(struct sk_buff *skb) |
684f2176 HX |
980 | { |
981 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
982 | struct tcphdr *th = tcp_hdr(skb); | |
983 | ||
984 | th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb), | |
985 | &iph->saddr, &iph->daddr, 0); | |
986 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
987 | ||
988 | return tcp_gro_complete(skb); | |
989 | } | |
684f2176 | 990 | |
626e264d IJ |
991 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
992 | u32 ts, struct tcp_md5sig_key *key, int rst) | |
1da177e4 | 993 | { |
aa8223c7 | 994 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
995 | struct sk_buff *buff; |
996 | struct flowi fl; | |
adf30907 | 997 | struct net *net = dev_net(skb_dst(skb)->dev); |
e5047992 | 998 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 999 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 1000 | struct dst_entry *dst; |
81ada62d | 1001 | __be32 *topt; |
1da177e4 | 1002 | |
626e264d IJ |
1003 | if (ts) |
1004 | tot_len += TCPOLEN_TSTAMP_ALIGNED; | |
cfb6eeb4 | 1005 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
1006 | if (key) |
1007 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
1008 | #endif | |
1009 | ||
cfb6eeb4 | 1010 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 1011 | GFP_ATOMIC); |
1ab1457c YH |
1012 | if (buff == NULL) |
1013 | return; | |
1da177e4 | 1014 | |
cfb6eeb4 | 1015 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 1016 | |
cfb6eeb4 | 1017 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
a8fdf2b3 | 1018 | skb_reset_transport_header(skb); |
1da177e4 LT |
1019 | |
1020 | /* Swap the send and the receive. */ | |
1021 | memset(t1, 0, sizeof(*t1)); | |
1022 | t1->dest = th->source; | |
1023 | t1->source = th->dest; | |
cfb6eeb4 | 1024 | t1->doff = tot_len / 4; |
626e264d IJ |
1025 | t1->seq = htonl(seq); |
1026 | t1->ack_seq = htonl(ack); | |
1027 | t1->ack = !rst || !th->ack; | |
1028 | t1->rst = rst; | |
1029 | t1->window = htons(win); | |
1da177e4 | 1030 | |
81ada62d IJ |
1031 | topt = (__be32 *)(t1 + 1); |
1032 | ||
626e264d IJ |
1033 | if (ts) { |
1034 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
1035 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
1036 | *topt++ = htonl(tcp_time_stamp); | |
1037 | *topt++ = htonl(ts); | |
1038 | } | |
1039 | ||
cfb6eeb4 YH |
1040 | #ifdef CONFIG_TCP_MD5SIG |
1041 | if (key) { | |
81ada62d IJ |
1042 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
1043 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
1044 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
1045 | &ipv6_hdr(skb)->saddr, |
1046 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
1047 | } |
1048 | #endif | |
1049 | ||
07f0757a | 1050 | buff->csum = csum_partial(t1, tot_len, 0); |
1da177e4 LT |
1051 | |
1052 | memset(&fl, 0, sizeof(fl)); | |
0660e03f ACM |
1053 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
1054 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1055 | |
1056 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
52cd5750 | 1057 | tot_len, IPPROTO_TCP, |
1da177e4 LT |
1058 | buff->csum); |
1059 | ||
1060 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 1061 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
1062 | fl.fl_ip_dport = t1->dest; |
1063 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 1064 | security_skb_classify_flow(skb, &fl); |
1da177e4 | 1065 | |
c20121ae DL |
1066 | /* Pass a socket to ip6_dst_lookup either it is for RST |
1067 | * Underlying function will use this to retrieve the network | |
1068 | * namespace | |
1069 | */ | |
adf30907 ED |
1070 | if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) { |
1071 | if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) { | |
1072 | skb_dst_set(buff, dst); | |
e5047992 | 1073 | ip6_xmit(ctl_sk, buff, &fl, NULL, 0); |
63231bdd | 1074 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
626e264d IJ |
1075 | if (rst) |
1076 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
1da177e4 | 1077 | return; |
ecc51b6d | 1078 | } |
1da177e4 LT |
1079 | } |
1080 | ||
1081 | kfree_skb(buff); | |
1082 | } | |
1083 | ||
626e264d | 1084 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1085 | { |
626e264d IJ |
1086 | struct tcphdr *th = tcp_hdr(skb); |
1087 | u32 seq = 0, ack_seq = 0; | |
fa3e5b4e | 1088 | struct tcp_md5sig_key *key = NULL; |
1da177e4 | 1089 | |
626e264d | 1090 | if (th->rst) |
1da177e4 LT |
1091 | return; |
1092 | ||
626e264d IJ |
1093 | if (!ipv6_unicast_destination(skb)) |
1094 | return; | |
1da177e4 | 1095 | |
cfb6eeb4 | 1096 | #ifdef CONFIG_TCP_MD5SIG |
626e264d IJ |
1097 | if (sk) |
1098 | key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr); | |
cfb6eeb4 YH |
1099 | #endif |
1100 | ||
626e264d IJ |
1101 | if (th->ack) |
1102 | seq = ntohl(th->ack_seq); | |
1103 | else | |
1104 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
1105 | (th->doff << 2); | |
1da177e4 | 1106 | |
626e264d IJ |
1107 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1); |
1108 | } | |
1da177e4 | 1109 | |
626e264d IJ |
1110 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts, |
1111 | struct tcp_md5sig_key *key) | |
1112 | { | |
1113 | tcp_v6_send_response(skb, seq, ack, win, ts, key, 0); | |
1da177e4 LT |
1114 | } |
1115 | ||
1116 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1117 | { | |
8feaf0c0 | 1118 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 1119 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 1120 | |
9501f972 | 1121 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 1122 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
9501f972 | 1123 | tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw)); |
1da177e4 | 1124 | |
8feaf0c0 | 1125 | inet_twsk_put(tw); |
1da177e4 LT |
1126 | } |
1127 | ||
6edafaaf GJ |
1128 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
1129 | struct request_sock *req) | |
1da177e4 | 1130 | { |
9501f972 | 1131 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent, |
6edafaaf | 1132 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr)); |
1da177e4 LT |
1133 | } |
1134 | ||
1135 | ||
1136 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
1137 | { | |
60236fdd | 1138 | struct request_sock *req, **prev; |
aa8223c7 | 1139 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
1140 | struct sock *nsk; |
1141 | ||
1142 | /* Find possible connection requests. */ | |
8129765a | 1143 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
1144 | &ipv6_hdr(skb)->saddr, |
1145 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 LT |
1146 | if (req) |
1147 | return tcp_check_req(sk, skb, req, prev); | |
1148 | ||
3b1e0a65 | 1149 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
1150 | &ipv6_hdr(skb)->saddr, th->source, |
1151 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
1152 | |
1153 | if (nsk) { | |
1154 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1155 | bh_lock_sock(nsk); | |
1156 | return nsk; | |
1157 | } | |
9469c7b4 | 1158 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1159 | return NULL; |
1160 | } | |
1161 | ||
c6aefafb | 1162 | #ifdef CONFIG_SYN_COOKIES |
1da177e4 | 1163 | if (!th->rst && !th->syn && th->ack) |
c6aefafb | 1164 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1165 | #endif |
1166 | return sk; | |
1167 | } | |
1168 | ||
1da177e4 LT |
1169 | /* FIXME: this is substantially similar to the ipv4 code. |
1170 | * Can some kind of merge be done? -- erics | |
1171 | */ | |
1172 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1173 | { | |
4957faad | 1174 | struct tcp_extend_values tmp_ext; |
e6b4d113 | 1175 | struct tcp_options_received tmp_opt; |
4957faad | 1176 | u8 *hash_location; |
e6b4d113 | 1177 | struct request_sock *req; |
ca304b61 | 1178 | struct inet6_request_sock *treq; |
1da177e4 | 1179 | struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 | 1180 | struct tcp_sock *tp = tcp_sk(sk); |
e6b4d113 | 1181 | __u32 isn = TCP_SKB_CB(skb)->when; |
c6aefafb GG |
1182 | #ifdef CONFIG_SYN_COOKIES |
1183 | int want_cookie = 0; | |
1184 | #else | |
1185 | #define want_cookie 0 | |
1186 | #endif | |
1da177e4 LT |
1187 | |
1188 | if (skb->protocol == htons(ETH_P_IP)) | |
1189 | return tcp_v4_conn_request(sk, skb); | |
1190 | ||
1191 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1192 | goto drop; |
1da177e4 | 1193 | |
463c84b9 | 1194 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 | 1195 | if (net_ratelimit()) |
c6aefafb GG |
1196 | syn_flood_warning(skb); |
1197 | #ifdef CONFIG_SYN_COOKIES | |
1198 | if (sysctl_tcp_syncookies) | |
1199 | want_cookie = 1; | |
1200 | else | |
1201 | #endif | |
1ab1457c | 1202 | goto drop; |
1da177e4 LT |
1203 | } |
1204 | ||
463c84b9 | 1205 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1206 | goto drop; |
1207 | ||
ca304b61 | 1208 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1209 | if (req == NULL) |
1210 | goto drop; | |
1211 | ||
cfb6eeb4 YH |
1212 | #ifdef CONFIG_TCP_MD5SIG |
1213 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
1214 | #endif | |
1215 | ||
1da177e4 LT |
1216 | tcp_clear_options(&tmp_opt); |
1217 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1218 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
bb5b7c11 | 1219 | tcp_parse_options(skb, &tmp_opt, &hash_location, 0); |
4957faad WAS |
1220 | |
1221 | if (tmp_opt.cookie_plus > 0 && | |
1222 | tmp_opt.saw_tstamp && | |
1223 | !tp->rx_opt.cookie_out_never && | |
1224 | (sysctl_tcp_cookie_size > 0 || | |
1225 | (tp->cookie_values != NULL && | |
1226 | tp->cookie_values->cookie_desired > 0))) { | |
1227 | u8 *c; | |
1228 | u32 *d; | |
1229 | u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS]; | |
1230 | int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE; | |
1231 | ||
1232 | if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0) | |
1233 | goto drop_and_free; | |
1234 | ||
1235 | /* Secret recipe starts with IP addresses */ | |
1236 | d = &ipv6_hdr(skb)->daddr.s6_addr32[0]; | |
1237 | *mess++ ^= *d++; | |
1238 | *mess++ ^= *d++; | |
1239 | *mess++ ^= *d++; | |
1240 | *mess++ ^= *d++; | |
1241 | d = &ipv6_hdr(skb)->saddr.s6_addr32[0]; | |
1242 | *mess++ ^= *d++; | |
1243 | *mess++ ^= *d++; | |
1244 | *mess++ ^= *d++; | |
1245 | *mess++ ^= *d++; | |
1246 | ||
1247 | /* plus variable length Initiator Cookie */ | |
1248 | c = (u8 *)mess; | |
1249 | while (l-- > 0) | |
1250 | *c++ ^= *hash_location++; | |
1da177e4 | 1251 | |
4957faad WAS |
1252 | #ifdef CONFIG_SYN_COOKIES |
1253 | want_cookie = 0; /* not our kind of cookie */ | |
1254 | #endif | |
1255 | tmp_ext.cookie_out_never = 0; /* false */ | |
1256 | tmp_ext.cookie_plus = tmp_opt.cookie_plus; | |
1257 | } else if (!tp->rx_opt.cookie_in_always) { | |
1258 | /* redundant indications, but ensure initialization. */ | |
1259 | tmp_ext.cookie_out_never = 1; /* true */ | |
1260 | tmp_ext.cookie_plus = 0; | |
1261 | } else { | |
1262 | goto drop_and_free; | |
1263 | } | |
1264 | tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always; | |
1da177e4 | 1265 | |
4dfc2817 | 1266 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 1267 | tcp_clear_options(&tmp_opt); |
c6aefafb | 1268 | |
1da177e4 LT |
1269 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1270 | tcp_openreq_init(req, &tmp_opt, skb); | |
1271 | ||
ca304b61 | 1272 | treq = inet6_rsk(req); |
0660e03f ACM |
1273 | ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr); |
1274 | ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr); | |
c6aefafb GG |
1275 | if (!want_cookie) |
1276 | TCP_ECN_create_request(req, tcp_hdr(skb)); | |
1277 | ||
1278 | if (want_cookie) { | |
1279 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); | |
4dfc2817 | 1280 | req->cookie_ts = tmp_opt.tstamp_ok; |
c6aefafb GG |
1281 | } else if (!isn) { |
1282 | if (ipv6_opt_accepted(sk, skb) || | |
1283 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1284 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1285 | atomic_inc(&skb->users); | |
1286 | treq->pktopts = skb; | |
1287 | } | |
1288 | treq->iif = sk->sk_bound_dev_if; | |
1da177e4 | 1289 | |
c6aefafb GG |
1290 | /* So that link locals have meaning */ |
1291 | if (!sk->sk_bound_dev_if && | |
1292 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1293 | treq->iif = inet6_iif(skb); | |
1da177e4 | 1294 | |
a94f723d | 1295 | isn = tcp_v6_init_sequence(skb); |
c6aefafb | 1296 | } |
2e6599cb | 1297 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1298 | |
4237c75c VY |
1299 | security_inet_conn_request(sk, skb, req); |
1300 | ||
4957faad WAS |
1301 | if (tcp_v6_send_synack(sk, req, |
1302 | (struct request_values *)&tmp_ext) || | |
1303 | want_cookie) | |
e6b4d113 | 1304 | goto drop_and_free; |
1da177e4 | 1305 | |
e6b4d113 WAS |
1306 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1307 | return 0; | |
1da177e4 | 1308 | |
e6b4d113 WAS |
1309 | drop_and_free: |
1310 | reqsk_free(req); | |
1da177e4 | 1311 | drop: |
1da177e4 LT |
1312 | return 0; /* don't send reset */ |
1313 | } | |
1314 | ||
1315 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1316 | struct request_sock *req, |
1da177e4 LT |
1317 | struct dst_entry *dst) |
1318 | { | |
78d15e82 | 1319 | struct inet6_request_sock *treq; |
1da177e4 LT |
1320 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1321 | struct tcp6_sock *newtcp6sk; | |
1322 | struct inet_sock *newinet; | |
1323 | struct tcp_sock *newtp; | |
1324 | struct sock *newsk; | |
1325 | struct ipv6_txoptions *opt; | |
cfb6eeb4 YH |
1326 | #ifdef CONFIG_TCP_MD5SIG |
1327 | struct tcp_md5sig_key *key; | |
1328 | #endif | |
1da177e4 LT |
1329 | |
1330 | if (skb->protocol == htons(ETH_P_IP)) { | |
1331 | /* | |
1332 | * v6 mapped | |
1333 | */ | |
1334 | ||
1335 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1336 | ||
1ab1457c | 1337 | if (newsk == NULL) |
1da177e4 LT |
1338 | return NULL; |
1339 | ||
1340 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1341 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1342 | ||
1343 | newinet = inet_sk(newsk); | |
1344 | newnp = inet6_sk(newsk); | |
1345 | newtp = tcp_sk(newsk); | |
1346 | ||
1347 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1348 | ||
c720c7e8 | 1349 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); |
1da177e4 | 1350 | |
c720c7e8 | 1351 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 LT |
1352 | |
1353 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1354 | ||
8292a17a | 1355 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1356 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1357 | #ifdef CONFIG_TCP_MD5SIG |
1358 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1359 | #endif | |
1360 | ||
1da177e4 LT |
1361 | newnp->pktoptions = NULL; |
1362 | newnp->opt = NULL; | |
505cbfc5 | 1363 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1364 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 | 1365 | |
e6848976 ACM |
1366 | /* |
1367 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1368 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1369 | * that function for the gory details. -acme | |
1da177e4 | 1370 | */ |
1da177e4 LT |
1371 | |
1372 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1373 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1374 | Sync it now. |
1375 | */ | |
d83d8461 | 1376 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1377 | |
1378 | return newsk; | |
1379 | } | |
1380 | ||
78d15e82 | 1381 | treq = inet6_rsk(req); |
1da177e4 LT |
1382 | opt = np->opt; |
1383 | ||
1384 | if (sk_acceptq_is_full(sk)) | |
1385 | goto out_overflow; | |
1386 | ||
1da177e4 LT |
1387 | if (dst == NULL) { |
1388 | struct in6_addr *final_p = NULL, final; | |
1389 | struct flowi fl; | |
1390 | ||
1391 | memset(&fl, 0, sizeof(fl)); | |
1392 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1393 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
1394 | if (opt && opt->srcrt) { |
1395 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1396 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1397 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1398 | final_p = &final; | |
1399 | } | |
2e6599cb | 1400 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1401 | fl.oif = sk->sk_bound_dev_if; |
51953d5b | 1402 | fl.mark = sk->sk_mark; |
2e6599cb | 1403 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
fd507037 | 1404 | fl.fl_ip_sport = inet_rsk(req)->loc_port; |
4237c75c | 1405 | security_req_classify_flow(req, &fl); |
1da177e4 LT |
1406 | |
1407 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1408 | goto out; | |
1409 | ||
1410 | if (final_p) | |
1411 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1412 | ||
52479b62 | 1413 | if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) |
1da177e4 | 1414 | goto out; |
1ab1457c | 1415 | } |
1da177e4 LT |
1416 | |
1417 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1418 | if (newsk == NULL) | |
1419 | goto out; | |
1420 | ||
e6848976 ACM |
1421 | /* |
1422 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1423 | * count here, tcp_create_openreq_child now does this for us, see the | |
1424 | * comment in that function for the gory details. -acme | |
1425 | */ | |
1da177e4 | 1426 | |
59eed279 | 1427 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1428 | __ip6_dst_store(newsk, dst, NULL, NULL); |
1da177e4 LT |
1429 | |
1430 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1431 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1432 | ||
1433 | newtp = tcp_sk(newsk); | |
1434 | newinet = inet_sk(newsk); | |
1435 | newnp = inet6_sk(newsk); | |
1436 | ||
1437 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1438 | ||
2e6599cb ACM |
1439 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1440 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1441 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1442 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 | 1443 | |
1ab1457c | 1444 | /* Now IPv6 options... |
1da177e4 LT |
1445 | |
1446 | First: no IPv4 options. | |
1447 | */ | |
1448 | newinet->opt = NULL; | |
d35690be | 1449 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1450 | |
1451 | /* Clone RX bits */ | |
1452 | newnp->rxopt.all = np->rxopt.all; | |
1453 | ||
1454 | /* Clone pktoptions received with SYN */ | |
1455 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1456 | if (treq->pktopts != NULL) { |
1457 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1458 | kfree_skb(treq->pktopts); | |
1459 | treq->pktopts = NULL; | |
1da177e4 LT |
1460 | if (newnp->pktoptions) |
1461 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1462 | } | |
1463 | newnp->opt = NULL; | |
505cbfc5 | 1464 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1465 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
1466 | |
1467 | /* Clone native IPv6 options from listening socket (if any) | |
1468 | ||
1469 | Yes, keeping reference count would be much more clever, | |
1470 | but we make one more one thing there: reattach optmem | |
1471 | to newsk. | |
1472 | */ | |
1473 | if (opt) { | |
1474 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1475 | if (opt != np->opt) | |
1476 | sock_kfree_s(sk, opt, opt->tot_len); | |
1477 | } | |
1478 | ||
d83d8461 | 1479 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1480 | if (newnp->opt) |
d83d8461 ACM |
1481 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1482 | newnp->opt->opt_flen); | |
1da177e4 | 1483 | |
5d424d5a | 1484 | tcp_mtup_init(newsk); |
1da177e4 LT |
1485 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1486 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1487 | tcp_initialize_rcv_mss(newsk); | |
1488 | ||
c720c7e8 ED |
1489 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1490 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1491 | |
cfb6eeb4 YH |
1492 | #ifdef CONFIG_TCP_MD5SIG |
1493 | /* Copy over the MD5 key from the original socket */ | |
1494 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1495 | /* We're using one, so create a matching key | |
1496 | * on the newsk structure. If we fail to get | |
1497 | * memory, then we end up not copying the key | |
1498 | * across. Shucks. | |
1499 | */ | |
af879cc7 ACM |
1500 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1501 | if (newkey != NULL) | |
e547bc1e | 1502 | tcp_v6_md5_do_add(newsk, &newnp->daddr, |
cfb6eeb4 | 1503 | newkey, key->keylen); |
cfb6eeb4 YH |
1504 | } |
1505 | #endif | |
1506 | ||
9327f705 | 1507 | __inet6_hash(newsk, NULL); |
e56d8b8a | 1508 | __inet_inherit_port(sk, newsk); |
1da177e4 LT |
1509 | |
1510 | return newsk; | |
1511 | ||
1512 | out_overflow: | |
de0744af | 1513 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
1da177e4 | 1514 | out: |
de0744af | 1515 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1516 | if (opt && opt != np->opt) |
1517 | sock_kfree_s(sk, opt, opt->tot_len); | |
1518 | dst_release(dst); | |
1519 | return NULL; | |
1520 | } | |
1521 | ||
b51655b9 | 1522 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1523 | { |
84fa7933 | 1524 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
684f2176 | 1525 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1526 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1527 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1528 | return 0; |
fb286bb2 | 1529 | } |
1da177e4 | 1530 | } |
fb286bb2 | 1531 | |
684f2176 | 1532 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
0660e03f ACM |
1533 | &ipv6_hdr(skb)->saddr, |
1534 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1535 | |
1da177e4 | 1536 | if (skb->len <= 76) { |
fb286bb2 | 1537 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1538 | } |
1539 | return 0; | |
1540 | } | |
1541 | ||
1542 | /* The socket must have it's spinlock held when we get | |
1543 | * here. | |
1544 | * | |
1545 | * We have a potential double-lock case here, so even when | |
1546 | * doing backlog processing we use the BH locking scheme. | |
1547 | * This is because we cannot sleep with the original spinlock | |
1548 | * held. | |
1549 | */ | |
1550 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1551 | { | |
1552 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1553 | struct tcp_sock *tp; | |
1554 | struct sk_buff *opt_skb = NULL; | |
1555 | ||
1556 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1557 | goes to IPv4 receive handler and backlogged. | |
1558 | From backlog it always goes here. Kerboom... | |
1559 | Fortunately, tcp_rcv_established and rcv_established | |
1560 | handle them correctly, but it is not case with | |
1561 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1562 | */ | |
1563 | ||
1564 | if (skb->protocol == htons(ETH_P_IP)) | |
1565 | return tcp_v4_do_rcv(sk, skb); | |
1566 | ||
cfb6eeb4 YH |
1567 | #ifdef CONFIG_TCP_MD5SIG |
1568 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1569 | goto discard; | |
1570 | #endif | |
1571 | ||
fda9ef5d | 1572 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1573 | goto discard; |
1574 | ||
1575 | /* | |
1576 | * socket locking is here for SMP purposes as backlog rcv | |
1577 | * is currently called with bh processing disabled. | |
1578 | */ | |
1579 | ||
1580 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1581 | ||
1582 | Yes, guys, it is the only place in our code, where we | |
1583 | may make it not affecting IPv4. | |
1584 | The rest of code is protocol independent, | |
1585 | and I do not like idea to uglify IPv4. | |
1586 | ||
1587 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1588 | looks not very well thought. For now we latch | |
1589 | options, received in the last packet, enqueued | |
1590 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1591 | --ANK (980728) |
1da177e4 LT |
1592 | */ |
1593 | if (np->rxopt.all) | |
1594 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1595 | ||
1596 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1597 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1598 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1599 | goto reset; |
1600 | TCP_CHECK_TIMER(sk); | |
1601 | if (opt_skb) | |
1602 | goto ipv6_pktoptions; | |
1603 | return 0; | |
1604 | } | |
1605 | ||
ab6a5bb6 | 1606 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1607 | goto csum_err; |
1608 | ||
1ab1457c | 1609 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1610 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1611 | if (!nsk) | |
1612 | goto discard; | |
1613 | ||
1614 | /* | |
1615 | * Queue it on the new socket if the new socket is active, | |
1616 | * otherwise we just shortcircuit this and continue with | |
1617 | * the new socket.. | |
1618 | */ | |
1ab1457c | 1619 | if(nsk != sk) { |
1da177e4 LT |
1620 | if (tcp_child_process(sk, nsk, skb)) |
1621 | goto reset; | |
1622 | if (opt_skb) | |
1623 | __kfree_skb(opt_skb); | |
1624 | return 0; | |
1625 | } | |
1626 | } | |
1627 | ||
1628 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1629 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1630 | goto reset; |
1631 | TCP_CHECK_TIMER(sk); | |
1632 | if (opt_skb) | |
1633 | goto ipv6_pktoptions; | |
1634 | return 0; | |
1635 | ||
1636 | reset: | |
cfb6eeb4 | 1637 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1638 | discard: |
1639 | if (opt_skb) | |
1640 | __kfree_skb(opt_skb); | |
1641 | kfree_skb(skb); | |
1642 | return 0; | |
1643 | csum_err: | |
63231bdd | 1644 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1645 | goto discard; |
1646 | ||
1647 | ||
1648 | ipv6_pktoptions: | |
1649 | /* Do you ask, what is it? | |
1650 | ||
1651 | 1. skb was enqueued by tcp. | |
1652 | 2. skb is added to tail of read queue, rather than out of order. | |
1653 | 3. socket is not in passive state. | |
1654 | 4. Finally, it really contains options, which user wants to receive. | |
1655 | */ | |
1656 | tp = tcp_sk(sk); | |
1657 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1658 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1659 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1660 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1661 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1662 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
1da177e4 LT |
1663 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1664 | skb_set_owner_r(opt_skb, sk); | |
1665 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1666 | } else { | |
1667 | __kfree_skb(opt_skb); | |
1668 | opt_skb = xchg(&np->pktoptions, NULL); | |
1669 | } | |
1670 | } | |
1671 | ||
800d55f1 | 1672 | kfree_skb(opt_skb); |
1da177e4 LT |
1673 | return 0; |
1674 | } | |
1675 | ||
e5bbef20 | 1676 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1677 | { |
1ab1457c | 1678 | struct tcphdr *th; |
1da177e4 LT |
1679 | struct sock *sk; |
1680 | int ret; | |
a86b1e30 | 1681 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1682 | |
1683 | if (skb->pkt_type != PACKET_HOST) | |
1684 | goto discard_it; | |
1685 | ||
1686 | /* | |
1687 | * Count it even if it's bad. | |
1688 | */ | |
63231bdd | 1689 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1690 | |
1691 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1692 | goto discard_it; | |
1693 | ||
aa8223c7 | 1694 | th = tcp_hdr(skb); |
1da177e4 LT |
1695 | |
1696 | if (th->doff < sizeof(struct tcphdr)/4) | |
1697 | goto bad_packet; | |
1698 | if (!pskb_may_pull(skb, th->doff*4)) | |
1699 | goto discard_it; | |
1700 | ||
60476372 | 1701 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1da177e4 LT |
1702 | goto bad_packet; |
1703 | ||
aa8223c7 | 1704 | th = tcp_hdr(skb); |
1da177e4 LT |
1705 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1706 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1707 | skb->len - th->doff*4); | |
1708 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1709 | TCP_SKB_CB(skb)->when = 0; | |
0660e03f | 1710 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 LT |
1711 | TCP_SKB_CB(skb)->sacked = 0; |
1712 | ||
9a1f27c4 | 1713 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1714 | if (!sk) |
1715 | goto no_tcp_socket; | |
1716 | ||
1717 | process: | |
1718 | if (sk->sk_state == TCP_TIME_WAIT) | |
1719 | goto do_time_wait; | |
1720 | ||
1721 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1722 | goto discard_and_relse; | |
1723 | ||
fda9ef5d | 1724 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1725 | goto discard_and_relse; |
1726 | ||
1727 | skb->dev = NULL; | |
1728 | ||
293b9c42 | 1729 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1730 | ret = 0; |
1731 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1732 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1733 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a | 1734 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
f67b4599 | 1735 | tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY); |
1ab1457c YH |
1736 | if (tp->ucopy.dma_chan) |
1737 | ret = tcp_v6_do_rcv(sk, skb); | |
1738 | else | |
1a2449a8 CL |
1739 | #endif |
1740 | { | |
1741 | if (!tcp_prequeue(sk, skb)) | |
1742 | ret = tcp_v6_do_rcv(sk, skb); | |
1743 | } | |
6cce09f8 | 1744 | } else if (unlikely(sk_add_backlog(sk, skb))) { |
6b03a53a | 1745 | bh_unlock_sock(sk); |
6cce09f8 | 1746 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1747 | goto discard_and_relse; |
1748 | } | |
1da177e4 LT |
1749 | bh_unlock_sock(sk); |
1750 | ||
1751 | sock_put(sk); | |
1752 | return ret ? -1 : 0; | |
1753 | ||
1754 | no_tcp_socket: | |
1755 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1756 | goto discard_it; | |
1757 | ||
1758 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1759 | bad_packet: | |
63231bdd | 1760 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1761 | } else { |
cfb6eeb4 | 1762 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1763 | } |
1764 | ||
1765 | discard_it: | |
1766 | ||
1767 | /* | |
1768 | * Discard frame | |
1769 | */ | |
1770 | ||
1771 | kfree_skb(skb); | |
1772 | return 0; | |
1773 | ||
1774 | discard_and_relse: | |
1775 | sock_put(sk); | |
1776 | goto discard_it; | |
1777 | ||
1778 | do_time_wait: | |
1779 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1780 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1781 | goto discard_it; |
1782 | } | |
1783 | ||
1784 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
63231bdd | 1785 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
9469c7b4 | 1786 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1787 | goto discard_it; |
1788 | } | |
1789 | ||
9469c7b4 | 1790 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1791 | case TCP_TW_SYN: |
1792 | { | |
1793 | struct sock *sk2; | |
1794 | ||
c346dca1 | 1795 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
0660e03f | 1796 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1797 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1798 | if (sk2 != NULL) { |
295ff7ed ACM |
1799 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1800 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1801 | inet_twsk_put(tw); | |
1da177e4 LT |
1802 | sk = sk2; |
1803 | goto process; | |
1804 | } | |
1805 | /* Fall through to ACK */ | |
1806 | } | |
1807 | case TCP_TW_ACK: | |
1808 | tcp_v6_timewait_ack(sk, skb); | |
1809 | break; | |
1810 | case TCP_TW_RST: | |
1811 | goto no_tcp_socket; | |
1812 | case TCP_TW_SUCCESS:; | |
1813 | } | |
1814 | goto discard_it; | |
1815 | } | |
1816 | ||
1da177e4 LT |
1817 | static int tcp_v6_remember_stamp(struct sock *sk) |
1818 | { | |
1819 | /* Alas, not yet... */ | |
1820 | return 0; | |
1821 | } | |
1822 | ||
3b401a81 | 1823 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1824 | .queue_xmit = inet6_csk_xmit, |
1825 | .send_check = tcp_v6_send_check, | |
1826 | .rebuild_header = inet6_sk_rebuild_header, | |
1827 | .conn_request = tcp_v6_conn_request, | |
1828 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1829 | .remember_stamp = tcp_v6_remember_stamp, | |
1830 | .net_header_len = sizeof(struct ipv6hdr), | |
1831 | .setsockopt = ipv6_setsockopt, | |
1832 | .getsockopt = ipv6_getsockopt, | |
1833 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1834 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1835 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1836 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1837 | .compat_setsockopt = compat_ipv6_setsockopt, |
1838 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1839 | #endif |
1da177e4 LT |
1840 | }; |
1841 | ||
cfb6eeb4 | 1842 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1843 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1844 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1845 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 YH |
1846 | .md5_add = tcp_v6_md5_add_func, |
1847 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1848 | }; |
a928630a | 1849 | #endif |
cfb6eeb4 | 1850 | |
1da177e4 LT |
1851 | /* |
1852 | * TCP over IPv4 via INET6 API | |
1853 | */ | |
1854 | ||
3b401a81 | 1855 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1856 | .queue_xmit = ip_queue_xmit, |
1857 | .send_check = tcp_v4_send_check, | |
1858 | .rebuild_header = inet_sk_rebuild_header, | |
1859 | .conn_request = tcp_v6_conn_request, | |
1860 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1861 | .remember_stamp = tcp_v4_remember_stamp, | |
1862 | .net_header_len = sizeof(struct iphdr), | |
1863 | .setsockopt = ipv6_setsockopt, | |
1864 | .getsockopt = ipv6_getsockopt, | |
1865 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1866 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1867 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1868 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1869 | .compat_setsockopt = compat_ipv6_setsockopt, |
1870 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1871 | #endif |
1da177e4 LT |
1872 | }; |
1873 | ||
cfb6eeb4 | 1874 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1875 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1876 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1877 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 YH |
1878 | .md5_add = tcp_v6_md5_add_func, |
1879 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1880 | }; |
a928630a | 1881 | #endif |
cfb6eeb4 | 1882 | |
1da177e4 LT |
1883 | /* NOTE: A lot of things set to zero explicitly by call to |
1884 | * sk_alloc() so need not be done here. | |
1885 | */ | |
1886 | static int tcp_v6_init_sock(struct sock *sk) | |
1887 | { | |
6687e988 | 1888 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1889 | struct tcp_sock *tp = tcp_sk(sk); |
1890 | ||
1891 | skb_queue_head_init(&tp->out_of_order_queue); | |
1892 | tcp_init_xmit_timers(sk); | |
1893 | tcp_prequeue_init(tp); | |
1894 | ||
6687e988 | 1895 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1896 | tp->mdev = TCP_TIMEOUT_INIT; |
1897 | ||
1898 | /* So many TCP implementations out there (incorrectly) count the | |
1899 | * initial SYN frame in their delayed-ACK and congestion control | |
1900 | * algorithms that we must have the following bandaid to talk | |
1901 | * efficiently to them. -DaveM | |
1902 | */ | |
1903 | tp->snd_cwnd = 2; | |
1904 | ||
1905 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1906 | * initialization of these values. | |
1907 | */ | |
0b6a05c1 | 1908 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; |
1da177e4 | 1909 | tp->snd_cwnd_clamp = ~0; |
bee7ca9e | 1910 | tp->mss_cache = TCP_MSS_DEFAULT; |
1da177e4 LT |
1911 | |
1912 | tp->reordering = sysctl_tcp_reordering; | |
1913 | ||
1914 | sk->sk_state = TCP_CLOSE; | |
1915 | ||
8292a17a | 1916 | icsk->icsk_af_ops = &ipv6_specific; |
6687e988 | 1917 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
d83d8461 | 1918 | icsk->icsk_sync_mss = tcp_sync_mss; |
1da177e4 LT |
1919 | sk->sk_write_space = sk_stream_write_space; |
1920 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1921 | ||
cfb6eeb4 YH |
1922 | #ifdef CONFIG_TCP_MD5SIG |
1923 | tp->af_specific = &tcp_sock_ipv6_specific; | |
1924 | #endif | |
1925 | ||
435cf559 WAS |
1926 | /* TCP Cookie Transactions */ |
1927 | if (sysctl_tcp_cookie_size > 0) { | |
1928 | /* Default, cookies without s_data_payload. */ | |
1929 | tp->cookie_values = | |
1930 | kzalloc(sizeof(*tp->cookie_values), | |
1931 | sk->sk_allocation); | |
1932 | if (tp->cookie_values != NULL) | |
1933 | kref_init(&tp->cookie_values->kref); | |
1934 | } | |
1935 | /* Presumed zeroed, in order of appearance: | |
1936 | * cookie_in_always, cookie_out_never, | |
1937 | * s_data_constant, s_data_in, s_data_out | |
1938 | */ | |
1da177e4 LT |
1939 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
1940 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1941 | ||
eb4dea58 | 1942 | local_bh_disable(); |
1748376b | 1943 | percpu_counter_inc(&tcp_sockets_allocated); |
eb4dea58 | 1944 | local_bh_enable(); |
1da177e4 LT |
1945 | |
1946 | return 0; | |
1947 | } | |
1948 | ||
7d06b2e0 | 1949 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1950 | { |
cfb6eeb4 YH |
1951 | #ifdef CONFIG_TCP_MD5SIG |
1952 | /* Clean up the MD5 key list */ | |
1953 | if (tcp_sk(sk)->md5sig_info) | |
1954 | tcp_v6_clear_md5_list(sk); | |
1955 | #endif | |
1da177e4 | 1956 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1957 | inet6_destroy_sock(sk); |
1da177e4 LT |
1958 | } |
1959 | ||
952a10be | 1960 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1961 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1962 | static void get_openreq6(struct seq_file *seq, |
60236fdd | 1963 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 1964 | { |
1da177e4 | 1965 | int ttd = req->expires - jiffies; |
ca304b61 ACM |
1966 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1967 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1968 | |
1969 | if (ttd < 0) | |
1970 | ttd = 0; | |
1971 | ||
1da177e4 LT |
1972 | seq_printf(seq, |
1973 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1974 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1975 | i, | |
1976 | src->s6_addr32[0], src->s6_addr32[1], | |
1977 | src->s6_addr32[2], src->s6_addr32[3], | |
fd507037 | 1978 | ntohs(inet_rsk(req)->loc_port), |
1da177e4 LT |
1979 | dest->s6_addr32[0], dest->s6_addr32[1], |
1980 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1981 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1982 | TCP_SYN_RECV, |
1983 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
1984 | 1, /* timers active (only the expire timer) */ |
1985 | jiffies_to_clock_t(ttd), | |
1da177e4 LT |
1986 | req->retrans, |
1987 | uid, | |
1ab1457c | 1988 | 0, /* non standard timer */ |
1da177e4 LT |
1989 | 0, /* open_requests have no inode */ |
1990 | 0, req); | |
1991 | } | |
1992 | ||
1993 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1994 | { | |
1995 | struct in6_addr *dest, *src; | |
1996 | __u16 destp, srcp; | |
1997 | int timer_active; | |
1998 | unsigned long timer_expires; | |
1999 | struct inet_sock *inet = inet_sk(sp); | |
2000 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 2001 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
2002 | struct ipv6_pinfo *np = inet6_sk(sp); |
2003 | ||
2004 | dest = &np->daddr; | |
2005 | src = &np->rcv_saddr; | |
c720c7e8 ED |
2006 | destp = ntohs(inet->inet_dport); |
2007 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
2008 | |
2009 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 2010 | timer_active = 1; |
463c84b9 ACM |
2011 | timer_expires = icsk->icsk_timeout; |
2012 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 2013 | timer_active = 4; |
463c84b9 | 2014 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
2015 | } else if (timer_pending(&sp->sk_timer)) { |
2016 | timer_active = 2; | |
2017 | timer_expires = sp->sk_timer.expires; | |
2018 | } else { | |
2019 | timer_active = 0; | |
2020 | timer_expires = jiffies; | |
2021 | } | |
2022 | ||
2023 | seq_printf(seq, | |
2024 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
7be87351 | 2025 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n", |
1da177e4 LT |
2026 | i, |
2027 | src->s6_addr32[0], src->s6_addr32[1], | |
2028 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2029 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2030 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 2031 | sp->sk_state, |
47da8ee6 SS |
2032 | tp->write_seq-tp->snd_una, |
2033 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 LT |
2034 | timer_active, |
2035 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 2036 | icsk->icsk_retransmits, |
1da177e4 | 2037 | sock_i_uid(sp), |
6687e988 | 2038 | icsk->icsk_probes_out, |
1da177e4 LT |
2039 | sock_i_ino(sp), |
2040 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
2041 | jiffies_to_clock_t(icsk->icsk_rto), |
2042 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 2043 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
0b6a05c1 IJ |
2044 | tp->snd_cwnd, |
2045 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh | |
1da177e4 LT |
2046 | ); |
2047 | } | |
2048 | ||
1ab1457c | 2049 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 2050 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
2051 | { |
2052 | struct in6_addr *dest, *src; | |
2053 | __u16 destp, srcp; | |
0fa1a53e | 2054 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
2055 | int ttd = tw->tw_ttd - jiffies; |
2056 | ||
2057 | if (ttd < 0) | |
2058 | ttd = 0; | |
2059 | ||
0fa1a53e ACM |
2060 | dest = &tw6->tw_v6_daddr; |
2061 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
2062 | destp = ntohs(tw->tw_dport); |
2063 | srcp = ntohs(tw->tw_sport); | |
2064 | ||
2065 | seq_printf(seq, | |
2066 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2067 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
2068 | i, | |
2069 | src->s6_addr32[0], src->s6_addr32[1], | |
2070 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2071 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2072 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2073 | tw->tw_substate, 0, 0, | |
2074 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2075 | atomic_read(&tw->tw_refcnt), tw); | |
2076 | } | |
2077 | ||
1da177e4 LT |
2078 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
2079 | { | |
2080 | struct tcp_iter_state *st; | |
2081 | ||
2082 | if (v == SEQ_START_TOKEN) { | |
2083 | seq_puts(seq, | |
2084 | " sl " | |
2085 | "local_address " | |
2086 | "remote_address " | |
2087 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2088 | " uid timeout inode\n"); | |
2089 | goto out; | |
2090 | } | |
2091 | st = seq->private; | |
2092 | ||
2093 | switch (st->state) { | |
2094 | case TCP_SEQ_STATE_LISTENING: | |
2095 | case TCP_SEQ_STATE_ESTABLISHED: | |
2096 | get_tcp6_sock(seq, v, st->num); | |
2097 | break; | |
2098 | case TCP_SEQ_STATE_OPENREQ: | |
2099 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
2100 | break; | |
2101 | case TCP_SEQ_STATE_TIME_WAIT: | |
2102 | get_timewait6_sock(seq, v, st->num); | |
2103 | break; | |
2104 | } | |
2105 | out: | |
2106 | return 0; | |
2107 | } | |
2108 | ||
1da177e4 | 2109 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
2110 | .name = "tcp6", |
2111 | .family = AF_INET6, | |
5f4472c5 DL |
2112 | .seq_fops = { |
2113 | .owner = THIS_MODULE, | |
2114 | }, | |
9427c4b3 DL |
2115 | .seq_ops = { |
2116 | .show = tcp6_seq_show, | |
2117 | }, | |
1da177e4 LT |
2118 | }; |
2119 | ||
2c8c1e72 | 2120 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 2121 | { |
6f8b13bc | 2122 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2123 | } |
2124 | ||
6f8b13bc | 2125 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2126 | { |
6f8b13bc | 2127 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2128 | } |
2129 | #endif | |
2130 | ||
2131 | struct proto tcpv6_prot = { | |
2132 | .name = "TCPv6", | |
2133 | .owner = THIS_MODULE, | |
2134 | .close = tcp_close, | |
2135 | .connect = tcp_v6_connect, | |
2136 | .disconnect = tcp_disconnect, | |
463c84b9 | 2137 | .accept = inet_csk_accept, |
1da177e4 LT |
2138 | .ioctl = tcp_ioctl, |
2139 | .init = tcp_v6_init_sock, | |
2140 | .destroy = tcp_v6_destroy_sock, | |
2141 | .shutdown = tcp_shutdown, | |
2142 | .setsockopt = tcp_setsockopt, | |
2143 | .getsockopt = tcp_getsockopt, | |
1da177e4 LT |
2144 | .recvmsg = tcp_recvmsg, |
2145 | .backlog_rcv = tcp_v6_do_rcv, | |
2146 | .hash = tcp_v6_hash, | |
ab1e0a13 ACM |
2147 | .unhash = inet_unhash, |
2148 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2149 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2150 | .sockets_allocated = &tcp_sockets_allocated, | |
2151 | .memory_allocated = &tcp_memory_allocated, | |
2152 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2153 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2154 | .sysctl_mem = sysctl_tcp_mem, |
2155 | .sysctl_wmem = sysctl_tcp_wmem, | |
2156 | .sysctl_rmem = sysctl_tcp_rmem, | |
2157 | .max_header = MAX_TCP_HEADER, | |
2158 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 2159 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 2160 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2161 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2162 | .h.hashinfo = &tcp_hashinfo, |
543d9cfe ACM |
2163 | #ifdef CONFIG_COMPAT |
2164 | .compat_setsockopt = compat_tcp_setsockopt, | |
2165 | .compat_getsockopt = compat_tcp_getsockopt, | |
2166 | #endif | |
1da177e4 LT |
2167 | }; |
2168 | ||
41135cc8 | 2169 | static const struct inet6_protocol tcpv6_protocol = { |
1da177e4 LT |
2170 | .handler = tcp_v6_rcv, |
2171 | .err_handler = tcp_v6_err, | |
a430a43d | 2172 | .gso_send_check = tcp_v6_gso_send_check, |
adcfc7d0 | 2173 | .gso_segment = tcp_tso_segment, |
684f2176 HX |
2174 | .gro_receive = tcp6_gro_receive, |
2175 | .gro_complete = tcp6_gro_complete, | |
1da177e4 LT |
2176 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
2177 | }; | |
2178 | ||
1da177e4 LT |
2179 | static struct inet_protosw tcpv6_protosw = { |
2180 | .type = SOCK_STREAM, | |
2181 | .protocol = IPPROTO_TCP, | |
2182 | .prot = &tcpv6_prot, | |
2183 | .ops = &inet6_stream_ops, | |
1da177e4 | 2184 | .no_check = 0, |
d83d8461 ACM |
2185 | .flags = INET_PROTOSW_PERMANENT | |
2186 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2187 | }; |
2188 | ||
2c8c1e72 | 2189 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 2190 | { |
5677242f DL |
2191 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2192 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2193 | } |
2194 | ||
2c8c1e72 | 2195 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 2196 | { |
5677242f | 2197 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
2198 | } |
2199 | ||
2c8c1e72 | 2200 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
2201 | { |
2202 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
2203 | } |
2204 | ||
2205 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
2206 | .init = tcpv6_net_init, |
2207 | .exit = tcpv6_net_exit, | |
2208 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
2209 | }; |
2210 | ||
7f4e4868 | 2211 | int __init tcpv6_init(void) |
1da177e4 | 2212 | { |
7f4e4868 DL |
2213 | int ret; |
2214 | ||
2215 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2216 | if (ret) | |
2217 | goto out; | |
2218 | ||
1da177e4 | 2219 | /* register inet6 protocol */ |
7f4e4868 DL |
2220 | ret = inet6_register_protosw(&tcpv6_protosw); |
2221 | if (ret) | |
2222 | goto out_tcpv6_protocol; | |
2223 | ||
93ec926b | 2224 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2225 | if (ret) |
2226 | goto out_tcpv6_protosw; | |
2227 | out: | |
2228 | return ret; | |
ae0f7d5f | 2229 | |
7f4e4868 DL |
2230 | out_tcpv6_protocol: |
2231 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2232 | out_tcpv6_protosw: | |
2233 | inet6_unregister_protosw(&tcpv6_protosw); | |
2234 | goto out; | |
2235 | } | |
2236 | ||
09f7709f | 2237 | void tcpv6_exit(void) |
7f4e4868 | 2238 | { |
93ec926b | 2239 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2240 | inet6_unregister_protosw(&tcpv6_protosw); |
2241 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2242 | } |