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Commit | Line | Data |
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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); | |
20c59de2 | 132 | struct in6_addr *saddr = NULL, *final_p, final; |
1da177e4 LT |
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 | 252 | |
20c59de2 | 253 | final_p = fl6_update_dst(&fl, np->opt, &final); |
1da177e4 | 254 | |
beb8d13b VY |
255 | security_sk_classify_flow(sk, &fl); |
256 | ||
1da177e4 LT |
257 | err = ip6_dst_lookup(sk, &dst, &fl); |
258 | if (err) | |
259 | goto failure; | |
260 | if (final_p) | |
261 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
262 | ||
52479b62 AD |
263 | err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); |
264 | if (err < 0) { | |
14e50e57 DM |
265 | if (err == -EREMOTE) |
266 | err = ip6_dst_blackhole(sk, &dst, &fl); | |
267 | if (err < 0) | |
268 | goto failure; | |
269 | } | |
1da177e4 LT |
270 | |
271 | if (saddr == NULL) { | |
272 | saddr = &fl.fl6_src; | |
273 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
274 | } | |
275 | ||
276 | /* set the source address */ | |
277 | ipv6_addr_copy(&np->saddr, saddr); | |
c720c7e8 | 278 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 279 | |
f83ef8c0 | 280 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 281 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 282 | |
d83d8461 | 283 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 284 | if (np->opt) |
d83d8461 ACM |
285 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
286 | np->opt->opt_nflen); | |
1da177e4 LT |
287 | |
288 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
289 | ||
c720c7e8 | 290 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
291 | |
292 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 293 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
294 | if (err) |
295 | goto late_failure; | |
296 | ||
297 | if (!tp->write_seq) | |
298 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
299 | np->daddr.s6_addr32, | |
c720c7e8 ED |
300 | inet->inet_sport, |
301 | inet->inet_dport); | |
1da177e4 LT |
302 | |
303 | err = tcp_connect(sk); | |
304 | if (err) | |
305 | goto late_failure; | |
306 | ||
307 | return 0; | |
308 | ||
309 | late_failure: | |
310 | tcp_set_state(sk, TCP_CLOSE); | |
311 | __sk_dst_reset(sk); | |
312 | failure: | |
c720c7e8 | 313 | inet->inet_dport = 0; |
1da177e4 LT |
314 | sk->sk_route_caps = 0; |
315 | return err; | |
316 | } | |
317 | ||
318 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 319 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 LT |
320 | { |
321 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
505cbfc5 | 322 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
323 | struct ipv6_pinfo *np; |
324 | struct sock *sk; | |
325 | int err; | |
1ab1457c | 326 | struct tcp_sock *tp; |
1da177e4 | 327 | __u32 seq; |
ca12a1a4 | 328 | struct net *net = dev_net(skb->dev); |
1da177e4 | 329 | |
ca12a1a4 | 330 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 331 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
332 | |
333 | if (sk == NULL) { | |
e41b5368 DL |
334 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
335 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
336 | return; |
337 | } | |
338 | ||
339 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 340 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
341 | return; |
342 | } | |
343 | ||
344 | bh_lock_sock(sk); | |
345 | if (sock_owned_by_user(sk)) | |
de0744af | 346 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
347 | |
348 | if (sk->sk_state == TCP_CLOSE) | |
349 | goto out; | |
350 | ||
e802af9c SH |
351 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
352 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
353 | goto out; | |
354 | } | |
355 | ||
1da177e4 | 356 | tp = tcp_sk(sk); |
1ab1457c | 357 | seq = ntohl(th->seq); |
1da177e4 LT |
358 | if (sk->sk_state != TCP_LISTEN && |
359 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
de0744af | 360 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
361 | goto out; |
362 | } | |
363 | ||
364 | np = inet6_sk(sk); | |
365 | ||
366 | if (type == ICMPV6_PKT_TOOBIG) { | |
367 | struct dst_entry *dst = NULL; | |
368 | ||
369 | if (sock_owned_by_user(sk)) | |
370 | goto out; | |
371 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
372 | goto out; | |
373 | ||
374 | /* icmp should have updated the destination cache entry */ | |
375 | dst = __sk_dst_check(sk, np->dst_cookie); | |
376 | ||
377 | if (dst == NULL) { | |
378 | struct inet_sock *inet = inet_sk(sk); | |
379 | struct flowi fl; | |
380 | ||
381 | /* BUGGG_FUTURE: Again, it is not clear how | |
382 | to handle rthdr case. Ignore this complexity | |
383 | for now. | |
384 | */ | |
385 | memset(&fl, 0, sizeof(fl)); | |
386 | fl.proto = IPPROTO_TCP; | |
387 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
388 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
389 | fl.oif = sk->sk_bound_dev_if; | |
51953d5b | 390 | fl.mark = sk->sk_mark; |
c720c7e8 ED |
391 | fl.fl_ip_dport = inet->inet_dport; |
392 | fl.fl_ip_sport = inet->inet_sport; | |
beb8d13b | 393 | security_skb_classify_flow(skb, &fl); |
1da177e4 LT |
394 | |
395 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
396 | sk->sk_err_soft = -err; | |
397 | goto out; | |
398 | } | |
399 | ||
52479b62 | 400 | if ((err = xfrm_lookup(net, &dst, &fl, sk, 0)) < 0) { |
1da177e4 LT |
401 | sk->sk_err_soft = -err; |
402 | goto out; | |
403 | } | |
404 | ||
405 | } else | |
406 | dst_hold(dst); | |
407 | ||
d83d8461 | 408 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
1da177e4 LT |
409 | tcp_sync_mss(sk, dst_mtu(dst)); |
410 | tcp_simple_retransmit(sk); | |
411 | } /* else let the usual retransmit timer handle it */ | |
412 | dst_release(dst); | |
413 | goto out; | |
414 | } | |
415 | ||
416 | icmpv6_err_convert(type, code, &err); | |
417 | ||
60236fdd | 418 | /* Might be for an request_sock */ |
1da177e4 | 419 | switch (sk->sk_state) { |
60236fdd | 420 | struct request_sock *req, **prev; |
1da177e4 LT |
421 | case TCP_LISTEN: |
422 | if (sock_owned_by_user(sk)) | |
423 | goto out; | |
424 | ||
8129765a ACM |
425 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
426 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
427 | if (!req) |
428 | goto out; | |
429 | ||
430 | /* ICMPs are not backlogged, hence we cannot get | |
431 | * an established socket here. | |
432 | */ | |
547b792c | 433 | WARN_ON(req->sk != NULL); |
1da177e4 | 434 | |
2e6599cb | 435 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 436 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
437 | goto out; |
438 | } | |
439 | ||
463c84b9 | 440 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
441 | goto out; |
442 | ||
443 | case TCP_SYN_SENT: | |
444 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 445 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 446 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
447 | sk->sk_err = err; |
448 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
449 | ||
450 | tcp_done(sk); | |
451 | } else | |
452 | sk->sk_err_soft = err; | |
453 | goto out; | |
454 | } | |
455 | ||
456 | if (!sock_owned_by_user(sk) && np->recverr) { | |
457 | sk->sk_err = err; | |
458 | sk->sk_error_report(sk); | |
459 | } else | |
460 | sk->sk_err_soft = err; | |
461 | ||
462 | out: | |
463 | bh_unlock_sock(sk); | |
464 | sock_put(sk); | |
465 | } | |
466 | ||
467 | ||
e6b4d113 WAS |
468 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, |
469 | struct request_values *rvp) | |
1da177e4 | 470 | { |
ca304b61 | 471 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
472 | struct ipv6_pinfo *np = inet6_sk(sk); |
473 | struct sk_buff * skb; | |
474 | struct ipv6_txoptions *opt = NULL; | |
20c59de2 | 475 | struct in6_addr * final_p, final; |
1da177e4 | 476 | struct flowi fl; |
fd80eb94 | 477 | struct dst_entry *dst; |
1da177e4 LT |
478 | int err = -1; |
479 | ||
480 | memset(&fl, 0, sizeof(fl)); | |
481 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
482 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
483 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 484 | fl.fl6_flowlabel = 0; |
2e6599cb | 485 | fl.oif = treq->iif; |
51953d5b | 486 | fl.mark = sk->sk_mark; |
2e6599cb | 487 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
fd507037 | 488 | fl.fl_ip_sport = inet_rsk(req)->loc_port; |
4237c75c | 489 | security_req_classify_flow(req, &fl); |
1da177e4 | 490 | |
fd80eb94 | 491 | opt = np->opt; |
20c59de2 | 492 | final_p = fl6_update_dst(&fl, opt, &final); |
1da177e4 | 493 | |
fd80eb94 DL |
494 | err = ip6_dst_lookup(sk, &dst, &fl); |
495 | if (err) | |
496 | goto done; | |
497 | if (final_p) | |
498 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
52479b62 | 499 | if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) |
fd80eb94 DL |
500 | goto done; |
501 | ||
e6b4d113 | 502 | skb = tcp_make_synack(sk, dst, req, rvp); |
1da177e4 | 503 | if (skb) { |
8ad50d96 | 504 | __tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr); |
1da177e4 | 505 | |
2e6599cb | 506 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
4e15ed4d | 507 | err = ip6_xmit(sk, skb, &fl, opt); |
b9df3cb8 | 508 | err = net_xmit_eval(err); |
1da177e4 LT |
509 | } |
510 | ||
511 | done: | |
1ab1457c | 512 | if (opt && opt != np->opt) |
1da177e4 | 513 | sock_kfree_s(sk, opt, opt->tot_len); |
78b91042 | 514 | dst_release(dst); |
1da177e4 LT |
515 | return err; |
516 | } | |
517 | ||
72659ecc OP |
518 | static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req, |
519 | struct request_values *rvp) | |
520 | { | |
521 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); | |
522 | return tcp_v6_send_synack(sk, req, rvp); | |
523 | } | |
524 | ||
c6aefafb GG |
525 | static inline void syn_flood_warning(struct sk_buff *skb) |
526 | { | |
527 | #ifdef CONFIG_SYN_COOKIES | |
528 | if (sysctl_tcp_syncookies) | |
529 | printk(KERN_INFO | |
530 | "TCPv6: Possible SYN flooding on port %d. " | |
531 | "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest)); | |
532 | else | |
533 | #endif | |
534 | printk(KERN_INFO | |
535 | "TCPv6: Possible SYN flooding on port %d. " | |
536 | "Dropping request.\n", ntohs(tcp_hdr(skb)->dest)); | |
537 | } | |
538 | ||
60236fdd | 539 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 540 | { |
800d55f1 | 541 | kfree_skb(inet6_rsk(req)->pktopts); |
1da177e4 LT |
542 | } |
543 | ||
cfb6eeb4 YH |
544 | #ifdef CONFIG_TCP_MD5SIG |
545 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
546 | struct in6_addr *addr) | |
547 | { | |
548 | struct tcp_sock *tp = tcp_sk(sk); | |
549 | int i; | |
550 | ||
551 | BUG_ON(tp == NULL); | |
552 | ||
553 | if (!tp->md5sig_info || !tp->md5sig_info->entries6) | |
554 | return NULL; | |
555 | ||
556 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 557 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr)) |
f8ab18d2 | 558 | return &tp->md5sig_info->keys6[i].base; |
cfb6eeb4 YH |
559 | } |
560 | return NULL; | |
561 | } | |
562 | ||
563 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
564 | struct sock *addr_sk) | |
565 | { | |
566 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); | |
567 | } | |
568 | ||
569 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
570 | struct request_sock *req) | |
571 | { | |
572 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
573 | } | |
574 | ||
575 | static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer, | |
576 | char *newkey, u8 newkeylen) | |
577 | { | |
578 | /* Add key to the list */ | |
b0a713e9 | 579 | struct tcp_md5sig_key *key; |
cfb6eeb4 YH |
580 | struct tcp_sock *tp = tcp_sk(sk); |
581 | struct tcp6_md5sig_key *keys; | |
582 | ||
b0a713e9 | 583 | key = tcp_v6_md5_do_lookup(sk, peer); |
cfb6eeb4 YH |
584 | if (key) { |
585 | /* modify existing entry - just update that one */ | |
b0a713e9 MD |
586 | kfree(key->key); |
587 | key->key = newkey; | |
588 | key->keylen = newkeylen; | |
cfb6eeb4 YH |
589 | } else { |
590 | /* reallocate new list if current one is full. */ | |
591 | if (!tp->md5sig_info) { | |
592 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC); | |
593 | if (!tp->md5sig_info) { | |
594 | kfree(newkey); | |
595 | return -ENOMEM; | |
596 | } | |
a465419b | 597 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
cfb6eeb4 | 598 | } |
aa133076 | 599 | if (tcp_alloc_md5sig_pool(sk) == NULL) { |
aacbe8c8 YH |
600 | kfree(newkey); |
601 | return -ENOMEM; | |
602 | } | |
cfb6eeb4 YH |
603 | if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) { |
604 | keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) * | |
605 | (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC); | |
606 | ||
607 | if (!keys) { | |
608 | tcp_free_md5sig_pool(); | |
609 | kfree(newkey); | |
610 | return -ENOMEM; | |
611 | } | |
612 | ||
613 | if (tp->md5sig_info->entries6) | |
614 | memmove(keys, tp->md5sig_info->keys6, | |
615 | (sizeof (tp->md5sig_info->keys6[0]) * | |
616 | tp->md5sig_info->entries6)); | |
617 | ||
618 | kfree(tp->md5sig_info->keys6); | |
619 | tp->md5sig_info->keys6 = keys; | |
620 | tp->md5sig_info->alloced6++; | |
621 | } | |
622 | ||
623 | ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr, | |
624 | peer); | |
f8ab18d2 DM |
625 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey; |
626 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen; | |
cfb6eeb4 YH |
627 | |
628 | tp->md5sig_info->entries6++; | |
629 | } | |
630 | return 0; | |
631 | } | |
632 | ||
633 | static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk, | |
634 | u8 *newkey, __u8 newkeylen) | |
635 | { | |
636 | return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr, | |
637 | newkey, newkeylen); | |
638 | } | |
639 | ||
640 | static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer) | |
641 | { | |
642 | struct tcp_sock *tp = tcp_sk(sk); | |
643 | int i; | |
644 | ||
645 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 646 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) { |
cfb6eeb4 | 647 | /* Free the key */ |
f8ab18d2 | 648 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
649 | tp->md5sig_info->entries6--; |
650 | ||
651 | if (tp->md5sig_info->entries6 == 0) { | |
652 | kfree(tp->md5sig_info->keys6); | |
653 | tp->md5sig_info->keys6 = NULL; | |
ca983cef | 654 | tp->md5sig_info->alloced6 = 0; |
cfb6eeb4 YH |
655 | } else { |
656 | /* shrink the database */ | |
657 | if (tp->md5sig_info->entries6 != i) | |
658 | memmove(&tp->md5sig_info->keys6[i], | |
659 | &tp->md5sig_info->keys6[i+1], | |
660 | (tp->md5sig_info->entries6 - i) | |
661 | * sizeof (tp->md5sig_info->keys6[0])); | |
662 | } | |
77adefdc YH |
663 | tcp_free_md5sig_pool(); |
664 | return 0; | |
cfb6eeb4 YH |
665 | } |
666 | } | |
667 | return -ENOENT; | |
668 | } | |
669 | ||
670 | static void tcp_v6_clear_md5_list (struct sock *sk) | |
671 | { | |
672 | struct tcp_sock *tp = tcp_sk(sk); | |
673 | int i; | |
674 | ||
675 | if (tp->md5sig_info->entries6) { | |
676 | for (i = 0; i < tp->md5sig_info->entries6; i++) | |
f8ab18d2 | 677 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
678 | tp->md5sig_info->entries6 = 0; |
679 | tcp_free_md5sig_pool(); | |
680 | } | |
681 | ||
682 | kfree(tp->md5sig_info->keys6); | |
683 | tp->md5sig_info->keys6 = NULL; | |
684 | tp->md5sig_info->alloced6 = 0; | |
685 | ||
686 | if (tp->md5sig_info->entries4) { | |
687 | for (i = 0; i < tp->md5sig_info->entries4; i++) | |
f8ab18d2 | 688 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
689 | tp->md5sig_info->entries4 = 0; |
690 | tcp_free_md5sig_pool(); | |
691 | } | |
692 | ||
693 | kfree(tp->md5sig_info->keys4); | |
694 | tp->md5sig_info->keys4 = NULL; | |
695 | tp->md5sig_info->alloced4 = 0; | |
696 | } | |
697 | ||
698 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, | |
699 | int optlen) | |
700 | { | |
701 | struct tcp_md5sig cmd; | |
702 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
703 | u8 *newkey; | |
704 | ||
705 | if (optlen < sizeof(cmd)) | |
706 | return -EINVAL; | |
707 | ||
708 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
709 | return -EFAULT; | |
710 | ||
711 | if (sin6->sin6_family != AF_INET6) | |
712 | return -EINVAL; | |
713 | ||
714 | if (!cmd.tcpm_keylen) { | |
715 | if (!tcp_sk(sk)->md5sig_info) | |
716 | return -ENOENT; | |
e773e4fa | 717 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
cfb6eeb4 YH |
718 | return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]); |
719 | return tcp_v6_md5_do_del(sk, &sin6->sin6_addr); | |
720 | } | |
721 | ||
722 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
723 | return -EINVAL; | |
724 | ||
725 | if (!tcp_sk(sk)->md5sig_info) { | |
726 | struct tcp_sock *tp = tcp_sk(sk); | |
727 | struct tcp_md5sig_info *p; | |
728 | ||
729 | p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL); | |
730 | if (!p) | |
731 | return -ENOMEM; | |
732 | ||
733 | tp->md5sig_info = p; | |
a465419b | 734 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
cfb6eeb4 YH |
735 | } |
736 | ||
af879cc7 | 737 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
738 | if (!newkey) |
739 | return -ENOMEM; | |
e773e4fa | 740 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { |
cfb6eeb4 YH |
741 | return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3], |
742 | newkey, cmd.tcpm_keylen); | |
743 | } | |
744 | return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen); | |
745 | } | |
746 | ||
49a72dfb AL |
747 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
748 | struct in6_addr *daddr, | |
749 | struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 750 | { |
cfb6eeb4 | 751 | struct tcp6_pseudohdr *bp; |
49a72dfb | 752 | struct scatterlist sg; |
8d26d76d | 753 | |
cfb6eeb4 | 754 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 YH |
755 | /* 1. TCP pseudo-header (RFC2460) */ |
756 | ipv6_addr_copy(&bp->saddr, saddr); | |
757 | ipv6_addr_copy(&bp->daddr, daddr); | |
49a72dfb | 758 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 759 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 760 | |
49a72dfb AL |
761 | sg_init_one(&sg, bp, sizeof(*bp)); |
762 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
763 | } | |
c7da57a1 | 764 | |
49a72dfb AL |
765 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
766 | struct in6_addr *daddr, struct in6_addr *saddr, | |
767 | struct tcphdr *th) | |
768 | { | |
769 | struct tcp_md5sig_pool *hp; | |
770 | struct hash_desc *desc; | |
771 | ||
772 | hp = tcp_get_md5sig_pool(); | |
773 | if (!hp) | |
774 | goto clear_hash_noput; | |
775 | desc = &hp->md5_desc; | |
776 | ||
777 | if (crypto_hash_init(desc)) | |
778 | goto clear_hash; | |
779 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
780 | goto clear_hash; | |
781 | if (tcp_md5_hash_header(hp, th)) | |
782 | goto clear_hash; | |
783 | if (tcp_md5_hash_key(hp, key)) | |
784 | goto clear_hash; | |
785 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 786 | goto clear_hash; |
cfb6eeb4 | 787 | |
cfb6eeb4 | 788 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 789 | return 0; |
49a72dfb | 790 | |
cfb6eeb4 YH |
791 | clear_hash: |
792 | tcp_put_md5sig_pool(); | |
793 | clear_hash_noput: | |
794 | memset(md5_hash, 0, 16); | |
49a72dfb | 795 | return 1; |
cfb6eeb4 YH |
796 | } |
797 | ||
49a72dfb AL |
798 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
799 | struct sock *sk, struct request_sock *req, | |
800 | struct sk_buff *skb) | |
cfb6eeb4 YH |
801 | { |
802 | struct in6_addr *saddr, *daddr; | |
49a72dfb AL |
803 | struct tcp_md5sig_pool *hp; |
804 | struct hash_desc *desc; | |
805 | struct tcphdr *th = tcp_hdr(skb); | |
cfb6eeb4 YH |
806 | |
807 | if (sk) { | |
808 | saddr = &inet6_sk(sk)->saddr; | |
809 | daddr = &inet6_sk(sk)->daddr; | |
49a72dfb | 810 | } else if (req) { |
cfb6eeb4 YH |
811 | saddr = &inet6_rsk(req)->loc_addr; |
812 | daddr = &inet6_rsk(req)->rmt_addr; | |
49a72dfb AL |
813 | } else { |
814 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
815 | saddr = &ip6h->saddr; | |
816 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 817 | } |
49a72dfb AL |
818 | |
819 | hp = tcp_get_md5sig_pool(); | |
820 | if (!hp) | |
821 | goto clear_hash_noput; | |
822 | desc = &hp->md5_desc; | |
823 | ||
824 | if (crypto_hash_init(desc)) | |
825 | goto clear_hash; | |
826 | ||
827 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
828 | goto clear_hash; | |
829 | if (tcp_md5_hash_header(hp, th)) | |
830 | goto clear_hash; | |
831 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
832 | goto clear_hash; | |
833 | if (tcp_md5_hash_key(hp, key)) | |
834 | goto clear_hash; | |
835 | if (crypto_hash_final(desc, md5_hash)) | |
836 | goto clear_hash; | |
837 | ||
838 | tcp_put_md5sig_pool(); | |
839 | return 0; | |
840 | ||
841 | clear_hash: | |
842 | tcp_put_md5sig_pool(); | |
843 | clear_hash_noput: | |
844 | memset(md5_hash, 0, 16); | |
845 | return 1; | |
cfb6eeb4 YH |
846 | } |
847 | ||
848 | static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb) | |
849 | { | |
850 | __u8 *hash_location = NULL; | |
851 | struct tcp_md5sig_key *hash_expected; | |
0660e03f | 852 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
aa8223c7 | 853 | struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 854 | int genhash; |
cfb6eeb4 YH |
855 | u8 newhash[16]; |
856 | ||
857 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 858 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 859 | |
785957d3 DM |
860 | /* We've parsed the options - do we have a hash? */ |
861 | if (!hash_expected && !hash_location) | |
862 | return 0; | |
863 | ||
864 | if (hash_expected && !hash_location) { | |
865 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
866 | return 1; |
867 | } | |
868 | ||
785957d3 DM |
869 | if (!hash_expected && hash_location) { |
870 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
871 | return 1; |
872 | } | |
873 | ||
874 | /* check the signature */ | |
49a72dfb AL |
875 | genhash = tcp_v6_md5_hash_skb(newhash, |
876 | hash_expected, | |
877 | NULL, NULL, skb); | |
878 | ||
cfb6eeb4 YH |
879 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
880 | if (net_ratelimit()) { | |
5856b606 | 881 | printk(KERN_INFO "MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
cfb6eeb4 | 882 | genhash ? "failed" : "mismatch", |
0c6ce78a HH |
883 | &ip6h->saddr, ntohs(th->source), |
884 | &ip6h->daddr, ntohs(th->dest)); | |
cfb6eeb4 YH |
885 | } |
886 | return 1; | |
887 | } | |
888 | return 0; | |
889 | } | |
890 | #endif | |
891 | ||
c6aefafb | 892 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 893 | .family = AF_INET6, |
2e6599cb | 894 | .obj_size = sizeof(struct tcp6_request_sock), |
72659ecc | 895 | .rtx_syn_ack = tcp_v6_rtx_synack, |
60236fdd ACM |
896 | .send_ack = tcp_v6_reqsk_send_ack, |
897 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc OP |
898 | .send_reset = tcp_v6_send_reset, |
899 | .syn_ack_timeout = tcp_syn_ack_timeout, | |
1da177e4 LT |
900 | }; |
901 | ||
cfb6eeb4 | 902 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 903 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 904 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 905 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 906 | }; |
b6332e6c | 907 | #endif |
cfb6eeb4 | 908 | |
6d6ee43e ACM |
909 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
910 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
911 | .twsk_unique = tcp_twsk_unique, | |
cfb6eeb4 | 912 | .twsk_destructor= tcp_twsk_destructor, |
6d6ee43e ACM |
913 | }; |
914 | ||
8ad50d96 HX |
915 | static void __tcp_v6_send_check(struct sk_buff *skb, |
916 | struct in6_addr *saddr, struct in6_addr *daddr) | |
1da177e4 | 917 | { |
aa8223c7 | 918 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 919 | |
84fa7933 | 920 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
8ad50d96 | 921 | th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0); |
663ead3b | 922 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 923 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 924 | } else { |
8ad50d96 HX |
925 | th->check = tcp_v6_check(skb->len, saddr, daddr, |
926 | csum_partial(th, th->doff << 2, | |
927 | skb->csum)); | |
1da177e4 LT |
928 | } |
929 | } | |
930 | ||
bb296246 | 931 | static void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
8ad50d96 HX |
932 | { |
933 | struct ipv6_pinfo *np = inet6_sk(sk); | |
934 | ||
935 | __tcp_v6_send_check(skb, &np->saddr, &np->daddr); | |
936 | } | |
937 | ||
a430a43d HX |
938 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
939 | { | |
940 | struct ipv6hdr *ipv6h; | |
941 | struct tcphdr *th; | |
942 | ||
943 | if (!pskb_may_pull(skb, sizeof(*th))) | |
944 | return -EINVAL; | |
945 | ||
0660e03f | 946 | ipv6h = ipv6_hdr(skb); |
aa8223c7 | 947 | th = tcp_hdr(skb); |
a430a43d HX |
948 | |
949 | th->check = 0; | |
84fa7933 | 950 | skb->ip_summed = CHECKSUM_PARTIAL; |
8ad50d96 | 951 | __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr); |
a430a43d HX |
952 | return 0; |
953 | } | |
1da177e4 | 954 | |
36990673 HX |
955 | static struct sk_buff **tcp6_gro_receive(struct sk_buff **head, |
956 | struct sk_buff *skb) | |
684f2176 | 957 | { |
36e7b1b8 | 958 | struct ipv6hdr *iph = skb_gro_network_header(skb); |
684f2176 HX |
959 | |
960 | switch (skb->ip_summed) { | |
961 | case CHECKSUM_COMPLETE: | |
86911732 | 962 | if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr, |
684f2176 HX |
963 | skb->csum)) { |
964 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
965 | break; | |
966 | } | |
967 | ||
968 | /* fall through */ | |
969 | case CHECKSUM_NONE: | |
970 | NAPI_GRO_CB(skb)->flush = 1; | |
971 | return NULL; | |
972 | } | |
973 | ||
974 | return tcp_gro_receive(head, skb); | |
975 | } | |
684f2176 | 976 | |
36990673 | 977 | static int tcp6_gro_complete(struct sk_buff *skb) |
684f2176 HX |
978 | { |
979 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
980 | struct tcphdr *th = tcp_hdr(skb); | |
981 | ||
982 | th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb), | |
983 | &iph->saddr, &iph->daddr, 0); | |
984 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
985 | ||
986 | return tcp_gro_complete(skb); | |
987 | } | |
684f2176 | 988 | |
626e264d IJ |
989 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
990 | u32 ts, struct tcp_md5sig_key *key, int rst) | |
1da177e4 | 991 | { |
aa8223c7 | 992 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
993 | struct sk_buff *buff; |
994 | struct flowi fl; | |
adf30907 | 995 | struct net *net = dev_net(skb_dst(skb)->dev); |
e5047992 | 996 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 997 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 998 | struct dst_entry *dst; |
81ada62d | 999 | __be32 *topt; |
1da177e4 | 1000 | |
626e264d IJ |
1001 | if (ts) |
1002 | tot_len += TCPOLEN_TSTAMP_ALIGNED; | |
cfb6eeb4 | 1003 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
1004 | if (key) |
1005 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
1006 | #endif | |
1007 | ||
cfb6eeb4 | 1008 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 1009 | GFP_ATOMIC); |
1ab1457c YH |
1010 | if (buff == NULL) |
1011 | return; | |
1da177e4 | 1012 | |
cfb6eeb4 | 1013 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 1014 | |
cfb6eeb4 | 1015 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 1016 | skb_reset_transport_header(buff); |
1da177e4 LT |
1017 | |
1018 | /* Swap the send and the receive. */ | |
1019 | memset(t1, 0, sizeof(*t1)); | |
1020 | t1->dest = th->source; | |
1021 | t1->source = th->dest; | |
cfb6eeb4 | 1022 | t1->doff = tot_len / 4; |
626e264d IJ |
1023 | t1->seq = htonl(seq); |
1024 | t1->ack_seq = htonl(ack); | |
1025 | t1->ack = !rst || !th->ack; | |
1026 | t1->rst = rst; | |
1027 | t1->window = htons(win); | |
1da177e4 | 1028 | |
81ada62d IJ |
1029 | topt = (__be32 *)(t1 + 1); |
1030 | ||
626e264d IJ |
1031 | if (ts) { |
1032 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
1033 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
1034 | *topt++ = htonl(tcp_time_stamp); | |
1035 | *topt++ = htonl(ts); | |
1036 | } | |
1037 | ||
cfb6eeb4 YH |
1038 | #ifdef CONFIG_TCP_MD5SIG |
1039 | if (key) { | |
81ada62d IJ |
1040 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
1041 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
1042 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
1043 | &ipv6_hdr(skb)->saddr, |
1044 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
1045 | } |
1046 | #endif | |
1047 | ||
1da177e4 | 1048 | memset(&fl, 0, sizeof(fl)); |
0660e03f ACM |
1049 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
1050 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 | 1051 | |
e5700aff DM |
1052 | buff->ip_summed = CHECKSUM_PARTIAL; |
1053 | buff->csum = 0; | |
1054 | ||
8ad50d96 | 1055 | __tcp_v6_send_check(buff, &fl.fl6_src, &fl.fl6_dst); |
1da177e4 LT |
1056 | |
1057 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 1058 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
1059 | fl.fl_ip_dport = t1->dest; |
1060 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 1061 | security_skb_classify_flow(skb, &fl); |
1da177e4 | 1062 | |
c20121ae DL |
1063 | /* Pass a socket to ip6_dst_lookup either it is for RST |
1064 | * Underlying function will use this to retrieve the network | |
1065 | * namespace | |
1066 | */ | |
adf30907 ED |
1067 | if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) { |
1068 | if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) { | |
1069 | skb_dst_set(buff, dst); | |
4e15ed4d | 1070 | ip6_xmit(ctl_sk, buff, &fl, NULL); |
63231bdd | 1071 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
626e264d IJ |
1072 | if (rst) |
1073 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
1da177e4 | 1074 | return; |
ecc51b6d | 1075 | } |
1da177e4 LT |
1076 | } |
1077 | ||
1078 | kfree_skb(buff); | |
1079 | } | |
1080 | ||
626e264d | 1081 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1082 | { |
626e264d IJ |
1083 | struct tcphdr *th = tcp_hdr(skb); |
1084 | u32 seq = 0, ack_seq = 0; | |
fa3e5b4e | 1085 | struct tcp_md5sig_key *key = NULL; |
1da177e4 | 1086 | |
626e264d | 1087 | if (th->rst) |
1da177e4 LT |
1088 | return; |
1089 | ||
626e264d IJ |
1090 | if (!ipv6_unicast_destination(skb)) |
1091 | return; | |
1da177e4 | 1092 | |
cfb6eeb4 | 1093 | #ifdef CONFIG_TCP_MD5SIG |
626e264d IJ |
1094 | if (sk) |
1095 | key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr); | |
cfb6eeb4 YH |
1096 | #endif |
1097 | ||
626e264d IJ |
1098 | if (th->ack) |
1099 | seq = ntohl(th->ack_seq); | |
1100 | else | |
1101 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
1102 | (th->doff << 2); | |
1da177e4 | 1103 | |
626e264d IJ |
1104 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1); |
1105 | } | |
1da177e4 | 1106 | |
626e264d IJ |
1107 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts, |
1108 | struct tcp_md5sig_key *key) | |
1109 | { | |
1110 | tcp_v6_send_response(skb, seq, ack, win, ts, key, 0); | |
1da177e4 LT |
1111 | } |
1112 | ||
1113 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1114 | { | |
8feaf0c0 | 1115 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 1116 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 1117 | |
9501f972 | 1118 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 1119 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
9501f972 | 1120 | tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw)); |
1da177e4 | 1121 | |
8feaf0c0 | 1122 | inet_twsk_put(tw); |
1da177e4 LT |
1123 | } |
1124 | ||
6edafaaf GJ |
1125 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
1126 | struct request_sock *req) | |
1da177e4 | 1127 | { |
9501f972 | 1128 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent, |
6edafaaf | 1129 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr)); |
1da177e4 LT |
1130 | } |
1131 | ||
1132 | ||
1133 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
1134 | { | |
60236fdd | 1135 | struct request_sock *req, **prev; |
aa8223c7 | 1136 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
1137 | struct sock *nsk; |
1138 | ||
1139 | /* Find possible connection requests. */ | |
8129765a | 1140 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
1141 | &ipv6_hdr(skb)->saddr, |
1142 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 LT |
1143 | if (req) |
1144 | return tcp_check_req(sk, skb, req, prev); | |
1145 | ||
3b1e0a65 | 1146 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
1147 | &ipv6_hdr(skb)->saddr, th->source, |
1148 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
1149 | |
1150 | if (nsk) { | |
1151 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1152 | bh_lock_sock(nsk); | |
1153 | return nsk; | |
1154 | } | |
9469c7b4 | 1155 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1156 | return NULL; |
1157 | } | |
1158 | ||
c6aefafb | 1159 | #ifdef CONFIG_SYN_COOKIES |
1da177e4 | 1160 | if (!th->rst && !th->syn && th->ack) |
c6aefafb | 1161 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1162 | #endif |
1163 | return sk; | |
1164 | } | |
1165 | ||
1da177e4 LT |
1166 | /* FIXME: this is substantially similar to the ipv4 code. |
1167 | * Can some kind of merge be done? -- erics | |
1168 | */ | |
1169 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1170 | { | |
4957faad | 1171 | struct tcp_extend_values tmp_ext; |
e6b4d113 | 1172 | struct tcp_options_received tmp_opt; |
4957faad | 1173 | u8 *hash_location; |
e6b4d113 | 1174 | struct request_sock *req; |
ca304b61 | 1175 | struct inet6_request_sock *treq; |
1da177e4 | 1176 | struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 | 1177 | struct tcp_sock *tp = tcp_sk(sk); |
e6b4d113 | 1178 | __u32 isn = TCP_SKB_CB(skb)->when; |
c6aefafb GG |
1179 | #ifdef CONFIG_SYN_COOKIES |
1180 | int want_cookie = 0; | |
1181 | #else | |
1182 | #define want_cookie 0 | |
1183 | #endif | |
1da177e4 LT |
1184 | |
1185 | if (skb->protocol == htons(ETH_P_IP)) | |
1186 | return tcp_v4_conn_request(sk, skb); | |
1187 | ||
1188 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1189 | goto drop; |
1da177e4 | 1190 | |
463c84b9 | 1191 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 | 1192 | if (net_ratelimit()) |
c6aefafb GG |
1193 | syn_flood_warning(skb); |
1194 | #ifdef CONFIG_SYN_COOKIES | |
1195 | if (sysctl_tcp_syncookies) | |
1196 | want_cookie = 1; | |
1197 | else | |
1198 | #endif | |
1ab1457c | 1199 | goto drop; |
1da177e4 LT |
1200 | } |
1201 | ||
463c84b9 | 1202 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1203 | goto drop; |
1204 | ||
ca304b61 | 1205 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1206 | if (req == NULL) |
1207 | goto drop; | |
1208 | ||
cfb6eeb4 YH |
1209 | #ifdef CONFIG_TCP_MD5SIG |
1210 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
1211 | #endif | |
1212 | ||
1da177e4 LT |
1213 | tcp_clear_options(&tmp_opt); |
1214 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1215 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
bb5b7c11 | 1216 | tcp_parse_options(skb, &tmp_opt, &hash_location, 0); |
4957faad WAS |
1217 | |
1218 | if (tmp_opt.cookie_plus > 0 && | |
1219 | tmp_opt.saw_tstamp && | |
1220 | !tp->rx_opt.cookie_out_never && | |
1221 | (sysctl_tcp_cookie_size > 0 || | |
1222 | (tp->cookie_values != NULL && | |
1223 | tp->cookie_values->cookie_desired > 0))) { | |
1224 | u8 *c; | |
1225 | u32 *d; | |
1226 | u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS]; | |
1227 | int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE; | |
1228 | ||
1229 | if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0) | |
1230 | goto drop_and_free; | |
1231 | ||
1232 | /* Secret recipe starts with IP addresses */ | |
0eae88f3 | 1233 | d = (__force u32 *)&ipv6_hdr(skb)->daddr.s6_addr32[0]; |
4957faad WAS |
1234 | *mess++ ^= *d++; |
1235 | *mess++ ^= *d++; | |
1236 | *mess++ ^= *d++; | |
1237 | *mess++ ^= *d++; | |
0eae88f3 | 1238 | d = (__force u32 *)&ipv6_hdr(skb)->saddr.s6_addr32[0]; |
4957faad WAS |
1239 | *mess++ ^= *d++; |
1240 | *mess++ ^= *d++; | |
1241 | *mess++ ^= *d++; | |
1242 | *mess++ ^= *d++; | |
1243 | ||
1244 | /* plus variable length Initiator Cookie */ | |
1245 | c = (u8 *)mess; | |
1246 | while (l-- > 0) | |
1247 | *c++ ^= *hash_location++; | |
1da177e4 | 1248 | |
4957faad WAS |
1249 | #ifdef CONFIG_SYN_COOKIES |
1250 | want_cookie = 0; /* not our kind of cookie */ | |
1251 | #endif | |
1252 | tmp_ext.cookie_out_never = 0; /* false */ | |
1253 | tmp_ext.cookie_plus = tmp_opt.cookie_plus; | |
1254 | } else if (!tp->rx_opt.cookie_in_always) { | |
1255 | /* redundant indications, but ensure initialization. */ | |
1256 | tmp_ext.cookie_out_never = 1; /* true */ | |
1257 | tmp_ext.cookie_plus = 0; | |
1258 | } else { | |
1259 | goto drop_and_free; | |
1260 | } | |
1261 | tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always; | |
1da177e4 | 1262 | |
4dfc2817 | 1263 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 1264 | tcp_clear_options(&tmp_opt); |
c6aefafb | 1265 | |
1da177e4 LT |
1266 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1267 | tcp_openreq_init(req, &tmp_opt, skb); | |
1268 | ||
ca304b61 | 1269 | treq = inet6_rsk(req); |
0660e03f ACM |
1270 | ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr); |
1271 | ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr); | |
c6aefafb GG |
1272 | if (!want_cookie) |
1273 | TCP_ECN_create_request(req, tcp_hdr(skb)); | |
1274 | ||
1275 | if (want_cookie) { | |
1276 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); | |
4dfc2817 | 1277 | req->cookie_ts = tmp_opt.tstamp_ok; |
c6aefafb GG |
1278 | } else if (!isn) { |
1279 | if (ipv6_opt_accepted(sk, skb) || | |
1280 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1281 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1282 | atomic_inc(&skb->users); | |
1283 | treq->pktopts = skb; | |
1284 | } | |
1285 | treq->iif = sk->sk_bound_dev_if; | |
1da177e4 | 1286 | |
c6aefafb GG |
1287 | /* So that link locals have meaning */ |
1288 | if (!sk->sk_bound_dev_if && | |
1289 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1290 | treq->iif = inet6_iif(skb); | |
1da177e4 | 1291 | |
a94f723d | 1292 | isn = tcp_v6_init_sequence(skb); |
c6aefafb | 1293 | } |
2e6599cb | 1294 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1295 | |
4237c75c VY |
1296 | security_inet_conn_request(sk, skb, req); |
1297 | ||
4957faad WAS |
1298 | if (tcp_v6_send_synack(sk, req, |
1299 | (struct request_values *)&tmp_ext) || | |
1300 | want_cookie) | |
e6b4d113 | 1301 | goto drop_and_free; |
1da177e4 | 1302 | |
e6b4d113 WAS |
1303 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1304 | return 0; | |
1da177e4 | 1305 | |
e6b4d113 WAS |
1306 | drop_and_free: |
1307 | reqsk_free(req); | |
1da177e4 | 1308 | drop: |
1da177e4 LT |
1309 | return 0; /* don't send reset */ |
1310 | } | |
1311 | ||
1312 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1313 | struct request_sock *req, |
1da177e4 LT |
1314 | struct dst_entry *dst) |
1315 | { | |
78d15e82 | 1316 | struct inet6_request_sock *treq; |
1da177e4 LT |
1317 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1318 | struct tcp6_sock *newtcp6sk; | |
1319 | struct inet_sock *newinet; | |
1320 | struct tcp_sock *newtp; | |
1321 | struct sock *newsk; | |
1322 | struct ipv6_txoptions *opt; | |
cfb6eeb4 YH |
1323 | #ifdef CONFIG_TCP_MD5SIG |
1324 | struct tcp_md5sig_key *key; | |
1325 | #endif | |
1da177e4 LT |
1326 | |
1327 | if (skb->protocol == htons(ETH_P_IP)) { | |
1328 | /* | |
1329 | * v6 mapped | |
1330 | */ | |
1331 | ||
1332 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1333 | ||
1ab1457c | 1334 | if (newsk == NULL) |
1da177e4 LT |
1335 | return NULL; |
1336 | ||
1337 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1338 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1339 | ||
1340 | newinet = inet_sk(newsk); | |
1341 | newnp = inet6_sk(newsk); | |
1342 | newtp = tcp_sk(newsk); | |
1343 | ||
1344 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1345 | ||
c720c7e8 | 1346 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); |
1da177e4 | 1347 | |
c720c7e8 | 1348 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 LT |
1349 | |
1350 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1351 | ||
8292a17a | 1352 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1353 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1354 | #ifdef CONFIG_TCP_MD5SIG |
1355 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1356 | #endif | |
1357 | ||
1da177e4 LT |
1358 | newnp->pktoptions = NULL; |
1359 | newnp->opt = NULL; | |
505cbfc5 | 1360 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1361 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 | 1362 | |
e6848976 ACM |
1363 | /* |
1364 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1365 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1366 | * that function for the gory details. -acme | |
1da177e4 | 1367 | */ |
1da177e4 LT |
1368 | |
1369 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1370 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1371 | Sync it now. |
1372 | */ | |
d83d8461 | 1373 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1374 | |
1375 | return newsk; | |
1376 | } | |
1377 | ||
78d15e82 | 1378 | treq = inet6_rsk(req); |
1da177e4 LT |
1379 | opt = np->opt; |
1380 | ||
1381 | if (sk_acceptq_is_full(sk)) | |
1382 | goto out_overflow; | |
1383 | ||
1da177e4 | 1384 | if (dst == NULL) { |
20c59de2 | 1385 | struct in6_addr *final_p, final; |
1da177e4 LT |
1386 | struct flowi fl; |
1387 | ||
1388 | memset(&fl, 0, sizeof(fl)); | |
1389 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1390 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
20c59de2 | 1391 | final_p = fl6_update_dst(&fl, opt, &final); |
2e6599cb | 1392 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1393 | fl.oif = sk->sk_bound_dev_if; |
51953d5b | 1394 | fl.mark = sk->sk_mark; |
2e6599cb | 1395 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
fd507037 | 1396 | fl.fl_ip_sport = inet_rsk(req)->loc_port; |
4237c75c | 1397 | security_req_classify_flow(req, &fl); |
1da177e4 LT |
1398 | |
1399 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1400 | goto out; | |
1401 | ||
1402 | if (final_p) | |
1403 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1404 | ||
52479b62 | 1405 | if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) |
1da177e4 | 1406 | goto out; |
1ab1457c | 1407 | } |
1da177e4 LT |
1408 | |
1409 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1410 | if (newsk == NULL) | |
1411 | goto out; | |
1412 | ||
e6848976 ACM |
1413 | /* |
1414 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1415 | * count here, tcp_create_openreq_child now does this for us, see the | |
1416 | * comment in that function for the gory details. -acme | |
1417 | */ | |
1da177e4 | 1418 | |
59eed279 | 1419 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1420 | __ip6_dst_store(newsk, dst, NULL, NULL); |
1da177e4 LT |
1421 | |
1422 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1423 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1424 | ||
1425 | newtp = tcp_sk(newsk); | |
1426 | newinet = inet_sk(newsk); | |
1427 | newnp = inet6_sk(newsk); | |
1428 | ||
1429 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1430 | ||
2e6599cb ACM |
1431 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1432 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1433 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1434 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 | 1435 | |
1ab1457c | 1436 | /* Now IPv6 options... |
1da177e4 LT |
1437 | |
1438 | First: no IPv4 options. | |
1439 | */ | |
1440 | newinet->opt = NULL; | |
d35690be | 1441 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1442 | |
1443 | /* Clone RX bits */ | |
1444 | newnp->rxopt.all = np->rxopt.all; | |
1445 | ||
1446 | /* Clone pktoptions received with SYN */ | |
1447 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1448 | if (treq->pktopts != NULL) { |
1449 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1450 | kfree_skb(treq->pktopts); | |
1451 | treq->pktopts = NULL; | |
1da177e4 LT |
1452 | if (newnp->pktoptions) |
1453 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1454 | } | |
1455 | newnp->opt = NULL; | |
505cbfc5 | 1456 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1457 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
1458 | |
1459 | /* Clone native IPv6 options from listening socket (if any) | |
1460 | ||
1461 | Yes, keeping reference count would be much more clever, | |
1462 | but we make one more one thing there: reattach optmem | |
1463 | to newsk. | |
1464 | */ | |
1465 | if (opt) { | |
1466 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1467 | if (opt != np->opt) | |
1468 | sock_kfree_s(sk, opt, opt->tot_len); | |
1469 | } | |
1470 | ||
d83d8461 | 1471 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1472 | if (newnp->opt) |
d83d8461 ACM |
1473 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1474 | newnp->opt->opt_flen); | |
1da177e4 | 1475 | |
5d424d5a | 1476 | tcp_mtup_init(newsk); |
1da177e4 LT |
1477 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1478 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1479 | tcp_initialize_rcv_mss(newsk); | |
1480 | ||
c720c7e8 ED |
1481 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1482 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1483 | |
cfb6eeb4 YH |
1484 | #ifdef CONFIG_TCP_MD5SIG |
1485 | /* Copy over the MD5 key from the original socket */ | |
1486 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1487 | /* We're using one, so create a matching key | |
1488 | * on the newsk structure. If we fail to get | |
1489 | * memory, then we end up not copying the key | |
1490 | * across. Shucks. | |
1491 | */ | |
af879cc7 ACM |
1492 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1493 | if (newkey != NULL) | |
e547bc1e | 1494 | tcp_v6_md5_do_add(newsk, &newnp->daddr, |
cfb6eeb4 | 1495 | newkey, key->keylen); |
cfb6eeb4 YH |
1496 | } |
1497 | #endif | |
1498 | ||
9327f705 | 1499 | __inet6_hash(newsk, NULL); |
e56d8b8a | 1500 | __inet_inherit_port(sk, newsk); |
1da177e4 LT |
1501 | |
1502 | return newsk; | |
1503 | ||
1504 | out_overflow: | |
de0744af | 1505 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
1da177e4 | 1506 | out: |
de0744af | 1507 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1508 | if (opt && opt != np->opt) |
1509 | sock_kfree_s(sk, opt, opt->tot_len); | |
1510 | dst_release(dst); | |
1511 | return NULL; | |
1512 | } | |
1513 | ||
b51655b9 | 1514 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1515 | { |
84fa7933 | 1516 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
684f2176 | 1517 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1518 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1519 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1520 | return 0; |
fb286bb2 | 1521 | } |
1da177e4 | 1522 | } |
fb286bb2 | 1523 | |
684f2176 | 1524 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
0660e03f ACM |
1525 | &ipv6_hdr(skb)->saddr, |
1526 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1527 | |
1da177e4 | 1528 | if (skb->len <= 76) { |
fb286bb2 | 1529 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1530 | } |
1531 | return 0; | |
1532 | } | |
1533 | ||
1534 | /* The socket must have it's spinlock held when we get | |
1535 | * here. | |
1536 | * | |
1537 | * We have a potential double-lock case here, so even when | |
1538 | * doing backlog processing we use the BH locking scheme. | |
1539 | * This is because we cannot sleep with the original spinlock | |
1540 | * held. | |
1541 | */ | |
1542 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1543 | { | |
1544 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1545 | struct tcp_sock *tp; | |
1546 | struct sk_buff *opt_skb = NULL; | |
1547 | ||
1548 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1549 | goes to IPv4 receive handler and backlogged. | |
1550 | From backlog it always goes here. Kerboom... | |
1551 | Fortunately, tcp_rcv_established and rcv_established | |
1552 | handle them correctly, but it is not case with | |
1553 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1554 | */ | |
1555 | ||
1556 | if (skb->protocol == htons(ETH_P_IP)) | |
1557 | return tcp_v4_do_rcv(sk, skb); | |
1558 | ||
cfb6eeb4 YH |
1559 | #ifdef CONFIG_TCP_MD5SIG |
1560 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1561 | goto discard; | |
1562 | #endif | |
1563 | ||
fda9ef5d | 1564 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1565 | goto discard; |
1566 | ||
1567 | /* | |
1568 | * socket locking is here for SMP purposes as backlog rcv | |
1569 | * is currently called with bh processing disabled. | |
1570 | */ | |
1571 | ||
1572 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1573 | ||
1574 | Yes, guys, it is the only place in our code, where we | |
1575 | may make it not affecting IPv4. | |
1576 | The rest of code is protocol independent, | |
1577 | and I do not like idea to uglify IPv4. | |
1578 | ||
1579 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1580 | looks not very well thought. For now we latch | |
1581 | options, received in the last packet, enqueued | |
1582 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1583 | --ANK (980728) |
1da177e4 LT |
1584 | */ |
1585 | if (np->rxopt.all) | |
1586 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1587 | ||
1588 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1589 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1590 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1591 | goto reset; |
1592 | TCP_CHECK_TIMER(sk); | |
1593 | if (opt_skb) | |
1594 | goto ipv6_pktoptions; | |
1595 | return 0; | |
1596 | } | |
1597 | ||
ab6a5bb6 | 1598 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1599 | goto csum_err; |
1600 | ||
1ab1457c | 1601 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1602 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1603 | if (!nsk) | |
1604 | goto discard; | |
1605 | ||
1606 | /* | |
1607 | * Queue it on the new socket if the new socket is active, | |
1608 | * otherwise we just shortcircuit this and continue with | |
1609 | * the new socket.. | |
1610 | */ | |
1ab1457c | 1611 | if(nsk != sk) { |
1da177e4 LT |
1612 | if (tcp_child_process(sk, nsk, skb)) |
1613 | goto reset; | |
1614 | if (opt_skb) | |
1615 | __kfree_skb(opt_skb); | |
1616 | return 0; | |
1617 | } | |
1618 | } | |
1619 | ||
1620 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1621 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1622 | goto reset; |
1623 | TCP_CHECK_TIMER(sk); | |
1624 | if (opt_skb) | |
1625 | goto ipv6_pktoptions; | |
1626 | return 0; | |
1627 | ||
1628 | reset: | |
cfb6eeb4 | 1629 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1630 | discard: |
1631 | if (opt_skb) | |
1632 | __kfree_skb(opt_skb); | |
1633 | kfree_skb(skb); | |
1634 | return 0; | |
1635 | csum_err: | |
63231bdd | 1636 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1637 | goto discard; |
1638 | ||
1639 | ||
1640 | ipv6_pktoptions: | |
1641 | /* Do you ask, what is it? | |
1642 | ||
1643 | 1. skb was enqueued by tcp. | |
1644 | 2. skb is added to tail of read queue, rather than out of order. | |
1645 | 3. socket is not in passive state. | |
1646 | 4. Finally, it really contains options, which user wants to receive. | |
1647 | */ | |
1648 | tp = tcp_sk(sk); | |
1649 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1650 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1651 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1652 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1653 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1654 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
1da177e4 LT |
1655 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1656 | skb_set_owner_r(opt_skb, sk); | |
1657 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1658 | } else { | |
1659 | __kfree_skb(opt_skb); | |
1660 | opt_skb = xchg(&np->pktoptions, NULL); | |
1661 | } | |
1662 | } | |
1663 | ||
800d55f1 | 1664 | kfree_skb(opt_skb); |
1da177e4 LT |
1665 | return 0; |
1666 | } | |
1667 | ||
e5bbef20 | 1668 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1669 | { |
1ab1457c | 1670 | struct tcphdr *th; |
e802af9c | 1671 | struct ipv6hdr *hdr; |
1da177e4 LT |
1672 | struct sock *sk; |
1673 | int ret; | |
a86b1e30 | 1674 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1675 | |
1676 | if (skb->pkt_type != PACKET_HOST) | |
1677 | goto discard_it; | |
1678 | ||
1679 | /* | |
1680 | * Count it even if it's bad. | |
1681 | */ | |
63231bdd | 1682 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1683 | |
1684 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1685 | goto discard_it; | |
1686 | ||
aa8223c7 | 1687 | th = tcp_hdr(skb); |
1da177e4 LT |
1688 | |
1689 | if (th->doff < sizeof(struct tcphdr)/4) | |
1690 | goto bad_packet; | |
1691 | if (!pskb_may_pull(skb, th->doff*4)) | |
1692 | goto discard_it; | |
1693 | ||
60476372 | 1694 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1da177e4 LT |
1695 | goto bad_packet; |
1696 | ||
aa8223c7 | 1697 | th = tcp_hdr(skb); |
e802af9c | 1698 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
1699 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1700 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1701 | skb->len - th->doff*4); | |
1702 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1703 | TCP_SKB_CB(skb)->when = 0; | |
e802af9c | 1704 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(hdr); |
1da177e4 LT |
1705 | TCP_SKB_CB(skb)->sacked = 0; |
1706 | ||
9a1f27c4 | 1707 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1708 | if (!sk) |
1709 | goto no_tcp_socket; | |
1710 | ||
1711 | process: | |
1712 | if (sk->sk_state == TCP_TIME_WAIT) | |
1713 | goto do_time_wait; | |
1714 | ||
e802af9c SH |
1715 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1716 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1717 | goto discard_and_relse; | |
1718 | } | |
1719 | ||
1da177e4 LT |
1720 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1721 | goto discard_and_relse; | |
1722 | ||
fda9ef5d | 1723 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1724 | goto discard_and_relse; |
1725 | ||
1726 | skb->dev = NULL; | |
1727 | ||
293b9c42 | 1728 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1729 | ret = 0; |
1730 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1731 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1732 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a | 1733 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
f67b4599 | 1734 | tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY); |
1ab1457c YH |
1735 | if (tp->ucopy.dma_chan) |
1736 | ret = tcp_v6_do_rcv(sk, skb); | |
1737 | else | |
1a2449a8 CL |
1738 | #endif |
1739 | { | |
1740 | if (!tcp_prequeue(sk, skb)) | |
1741 | ret = tcp_v6_do_rcv(sk, skb); | |
1742 | } | |
6cce09f8 | 1743 | } else if (unlikely(sk_add_backlog(sk, skb))) { |
6b03a53a | 1744 | bh_unlock_sock(sk); |
6cce09f8 | 1745 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1746 | goto discard_and_relse; |
1747 | } | |
1da177e4 LT |
1748 | bh_unlock_sock(sk); |
1749 | ||
1750 | sock_put(sk); | |
1751 | return ret ? -1 : 0; | |
1752 | ||
1753 | no_tcp_socket: | |
1754 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1755 | goto discard_it; | |
1756 | ||
1757 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1758 | bad_packet: | |
63231bdd | 1759 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1760 | } else { |
cfb6eeb4 | 1761 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1762 | } |
1763 | ||
1764 | discard_it: | |
1765 | ||
1766 | /* | |
1767 | * Discard frame | |
1768 | */ | |
1769 | ||
1770 | kfree_skb(skb); | |
1771 | return 0; | |
1772 | ||
1773 | discard_and_relse: | |
1774 | sock_put(sk); | |
1775 | goto discard_it; | |
1776 | ||
1777 | do_time_wait: | |
1778 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1779 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1780 | goto discard_it; |
1781 | } | |
1782 | ||
1783 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
63231bdd | 1784 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
9469c7b4 | 1785 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1786 | goto discard_it; |
1787 | } | |
1788 | ||
9469c7b4 | 1789 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1790 | case TCP_TW_SYN: |
1791 | { | |
1792 | struct sock *sk2; | |
1793 | ||
c346dca1 | 1794 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
0660e03f | 1795 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1796 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1797 | if (sk2 != NULL) { |
295ff7ed ACM |
1798 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1799 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1800 | inet_twsk_put(tw); | |
1da177e4 LT |
1801 | sk = sk2; |
1802 | goto process; | |
1803 | } | |
1804 | /* Fall through to ACK */ | |
1805 | } | |
1806 | case TCP_TW_ACK: | |
1807 | tcp_v6_timewait_ack(sk, skb); | |
1808 | break; | |
1809 | case TCP_TW_RST: | |
1810 | goto no_tcp_socket; | |
1811 | case TCP_TW_SUCCESS:; | |
1812 | } | |
1813 | goto discard_it; | |
1814 | } | |
1815 | ||
1da177e4 LT |
1816 | static int tcp_v6_remember_stamp(struct sock *sk) |
1817 | { | |
1818 | /* Alas, not yet... */ | |
1819 | return 0; | |
1820 | } | |
1821 | ||
3b401a81 | 1822 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1823 | .queue_xmit = inet6_csk_xmit, |
1824 | .send_check = tcp_v6_send_check, | |
1825 | .rebuild_header = inet6_sk_rebuild_header, | |
1826 | .conn_request = tcp_v6_conn_request, | |
1827 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1828 | .remember_stamp = tcp_v6_remember_stamp, | |
1829 | .net_header_len = sizeof(struct ipv6hdr), | |
1830 | .setsockopt = ipv6_setsockopt, | |
1831 | .getsockopt = ipv6_getsockopt, | |
1832 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1833 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1834 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1835 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1836 | .compat_setsockopt = compat_ipv6_setsockopt, |
1837 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1838 | #endif |
1da177e4 LT |
1839 | }; |
1840 | ||
cfb6eeb4 | 1841 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1842 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1843 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1844 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 YH |
1845 | .md5_add = tcp_v6_md5_add_func, |
1846 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1847 | }; |
a928630a | 1848 | #endif |
cfb6eeb4 | 1849 | |
1da177e4 LT |
1850 | /* |
1851 | * TCP over IPv4 via INET6 API | |
1852 | */ | |
1853 | ||
3b401a81 | 1854 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1855 | .queue_xmit = ip_queue_xmit, |
1856 | .send_check = tcp_v4_send_check, | |
1857 | .rebuild_header = inet_sk_rebuild_header, | |
1858 | .conn_request = tcp_v6_conn_request, | |
1859 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1860 | .remember_stamp = tcp_v4_remember_stamp, | |
1861 | .net_header_len = sizeof(struct iphdr), | |
1862 | .setsockopt = ipv6_setsockopt, | |
1863 | .getsockopt = ipv6_getsockopt, | |
1864 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1865 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1866 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1867 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1868 | .compat_setsockopt = compat_ipv6_setsockopt, |
1869 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1870 | #endif |
1da177e4 LT |
1871 | }; |
1872 | ||
cfb6eeb4 | 1873 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1874 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1875 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1876 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 YH |
1877 | .md5_add = tcp_v6_md5_add_func, |
1878 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1879 | }; |
a928630a | 1880 | #endif |
cfb6eeb4 | 1881 | |
1da177e4 LT |
1882 | /* NOTE: A lot of things set to zero explicitly by call to |
1883 | * sk_alloc() so need not be done here. | |
1884 | */ | |
1885 | static int tcp_v6_init_sock(struct sock *sk) | |
1886 | { | |
6687e988 | 1887 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1888 | struct tcp_sock *tp = tcp_sk(sk); |
1889 | ||
1890 | skb_queue_head_init(&tp->out_of_order_queue); | |
1891 | tcp_init_xmit_timers(sk); | |
1892 | tcp_prequeue_init(tp); | |
1893 | ||
6687e988 | 1894 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1895 | tp->mdev = TCP_TIMEOUT_INIT; |
1896 | ||
1897 | /* So many TCP implementations out there (incorrectly) count the | |
1898 | * initial SYN frame in their delayed-ACK and congestion control | |
1899 | * algorithms that we must have the following bandaid to talk | |
1900 | * efficiently to them. -DaveM | |
1901 | */ | |
1902 | tp->snd_cwnd = 2; | |
1903 | ||
1904 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1905 | * initialization of these values. | |
1906 | */ | |
0b6a05c1 | 1907 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; |
1da177e4 | 1908 | tp->snd_cwnd_clamp = ~0; |
bee7ca9e | 1909 | tp->mss_cache = TCP_MSS_DEFAULT; |
1da177e4 LT |
1910 | |
1911 | tp->reordering = sysctl_tcp_reordering; | |
1912 | ||
1913 | sk->sk_state = TCP_CLOSE; | |
1914 | ||
8292a17a | 1915 | icsk->icsk_af_ops = &ipv6_specific; |
6687e988 | 1916 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
d83d8461 | 1917 | icsk->icsk_sync_mss = tcp_sync_mss; |
1da177e4 LT |
1918 | sk->sk_write_space = sk_stream_write_space; |
1919 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1920 | ||
cfb6eeb4 YH |
1921 | #ifdef CONFIG_TCP_MD5SIG |
1922 | tp->af_specific = &tcp_sock_ipv6_specific; | |
1923 | #endif | |
1924 | ||
435cf559 WAS |
1925 | /* TCP Cookie Transactions */ |
1926 | if (sysctl_tcp_cookie_size > 0) { | |
1927 | /* Default, cookies without s_data_payload. */ | |
1928 | tp->cookie_values = | |
1929 | kzalloc(sizeof(*tp->cookie_values), | |
1930 | sk->sk_allocation); | |
1931 | if (tp->cookie_values != NULL) | |
1932 | kref_init(&tp->cookie_values->kref); | |
1933 | } | |
1934 | /* Presumed zeroed, in order of appearance: | |
1935 | * cookie_in_always, cookie_out_never, | |
1936 | * s_data_constant, s_data_in, s_data_out | |
1937 | */ | |
1da177e4 LT |
1938 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
1939 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1940 | ||
eb4dea58 | 1941 | local_bh_disable(); |
1748376b | 1942 | percpu_counter_inc(&tcp_sockets_allocated); |
eb4dea58 | 1943 | local_bh_enable(); |
1da177e4 LT |
1944 | |
1945 | return 0; | |
1946 | } | |
1947 | ||
7d06b2e0 | 1948 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1949 | { |
cfb6eeb4 YH |
1950 | #ifdef CONFIG_TCP_MD5SIG |
1951 | /* Clean up the MD5 key list */ | |
1952 | if (tcp_sk(sk)->md5sig_info) | |
1953 | tcp_v6_clear_md5_list(sk); | |
1954 | #endif | |
1da177e4 | 1955 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1956 | inet6_destroy_sock(sk); |
1da177e4 LT |
1957 | } |
1958 | ||
952a10be | 1959 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1960 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1961 | static void get_openreq6(struct seq_file *seq, |
60236fdd | 1962 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 1963 | { |
1da177e4 | 1964 | int ttd = req->expires - jiffies; |
ca304b61 ACM |
1965 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1966 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1967 | |
1968 | if (ttd < 0) | |
1969 | ttd = 0; | |
1970 | ||
1da177e4 LT |
1971 | seq_printf(seq, |
1972 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1973 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1974 | i, | |
1975 | src->s6_addr32[0], src->s6_addr32[1], | |
1976 | src->s6_addr32[2], src->s6_addr32[3], | |
fd507037 | 1977 | ntohs(inet_rsk(req)->loc_port), |
1da177e4 LT |
1978 | dest->s6_addr32[0], dest->s6_addr32[1], |
1979 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1980 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1981 | TCP_SYN_RECV, |
1982 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
1983 | 1, /* timers active (only the expire timer) */ |
1984 | jiffies_to_clock_t(ttd), | |
1da177e4 LT |
1985 | req->retrans, |
1986 | uid, | |
1ab1457c | 1987 | 0, /* non standard timer */ |
1da177e4 LT |
1988 | 0, /* open_requests have no inode */ |
1989 | 0, req); | |
1990 | } | |
1991 | ||
1992 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1993 | { | |
1994 | struct in6_addr *dest, *src; | |
1995 | __u16 destp, srcp; | |
1996 | int timer_active; | |
1997 | unsigned long timer_expires; | |
1998 | struct inet_sock *inet = inet_sk(sp); | |
1999 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 2000 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
2001 | struct ipv6_pinfo *np = inet6_sk(sp); |
2002 | ||
2003 | dest = &np->daddr; | |
2004 | src = &np->rcv_saddr; | |
c720c7e8 ED |
2005 | destp = ntohs(inet->inet_dport); |
2006 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
2007 | |
2008 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 2009 | timer_active = 1; |
463c84b9 ACM |
2010 | timer_expires = icsk->icsk_timeout; |
2011 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 2012 | timer_active = 4; |
463c84b9 | 2013 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
2014 | } else if (timer_pending(&sp->sk_timer)) { |
2015 | timer_active = 2; | |
2016 | timer_expires = sp->sk_timer.expires; | |
2017 | } else { | |
2018 | timer_active = 0; | |
2019 | timer_expires = jiffies; | |
2020 | } | |
2021 | ||
2022 | seq_printf(seq, | |
2023 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
7be87351 | 2024 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n", |
1da177e4 LT |
2025 | i, |
2026 | src->s6_addr32[0], src->s6_addr32[1], | |
2027 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2028 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2029 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 2030 | sp->sk_state, |
47da8ee6 SS |
2031 | tp->write_seq-tp->snd_una, |
2032 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 LT |
2033 | timer_active, |
2034 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 2035 | icsk->icsk_retransmits, |
1da177e4 | 2036 | sock_i_uid(sp), |
6687e988 | 2037 | icsk->icsk_probes_out, |
1da177e4 LT |
2038 | sock_i_ino(sp), |
2039 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
2040 | jiffies_to_clock_t(icsk->icsk_rto), |
2041 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 2042 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
0b6a05c1 IJ |
2043 | tp->snd_cwnd, |
2044 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh | |
1da177e4 LT |
2045 | ); |
2046 | } | |
2047 | ||
1ab1457c | 2048 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 2049 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
2050 | { |
2051 | struct in6_addr *dest, *src; | |
2052 | __u16 destp, srcp; | |
0fa1a53e | 2053 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
2054 | int ttd = tw->tw_ttd - jiffies; |
2055 | ||
2056 | if (ttd < 0) | |
2057 | ttd = 0; | |
2058 | ||
0fa1a53e ACM |
2059 | dest = &tw6->tw_v6_daddr; |
2060 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
2061 | destp = ntohs(tw->tw_dport); |
2062 | srcp = ntohs(tw->tw_sport); | |
2063 | ||
2064 | seq_printf(seq, | |
2065 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2066 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
2067 | i, | |
2068 | src->s6_addr32[0], src->s6_addr32[1], | |
2069 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2070 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2071 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2072 | tw->tw_substate, 0, 0, | |
2073 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2074 | atomic_read(&tw->tw_refcnt), tw); | |
2075 | } | |
2076 | ||
1da177e4 LT |
2077 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
2078 | { | |
2079 | struct tcp_iter_state *st; | |
2080 | ||
2081 | if (v == SEQ_START_TOKEN) { | |
2082 | seq_puts(seq, | |
2083 | " sl " | |
2084 | "local_address " | |
2085 | "remote_address " | |
2086 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2087 | " uid timeout inode\n"); | |
2088 | goto out; | |
2089 | } | |
2090 | st = seq->private; | |
2091 | ||
2092 | switch (st->state) { | |
2093 | case TCP_SEQ_STATE_LISTENING: | |
2094 | case TCP_SEQ_STATE_ESTABLISHED: | |
2095 | get_tcp6_sock(seq, v, st->num); | |
2096 | break; | |
2097 | case TCP_SEQ_STATE_OPENREQ: | |
2098 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
2099 | break; | |
2100 | case TCP_SEQ_STATE_TIME_WAIT: | |
2101 | get_timewait6_sock(seq, v, st->num); | |
2102 | break; | |
2103 | } | |
2104 | out: | |
2105 | return 0; | |
2106 | } | |
2107 | ||
1da177e4 | 2108 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
2109 | .name = "tcp6", |
2110 | .family = AF_INET6, | |
5f4472c5 DL |
2111 | .seq_fops = { |
2112 | .owner = THIS_MODULE, | |
2113 | }, | |
9427c4b3 DL |
2114 | .seq_ops = { |
2115 | .show = tcp6_seq_show, | |
2116 | }, | |
1da177e4 LT |
2117 | }; |
2118 | ||
2c8c1e72 | 2119 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 2120 | { |
6f8b13bc | 2121 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2122 | } |
2123 | ||
6f8b13bc | 2124 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2125 | { |
6f8b13bc | 2126 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2127 | } |
2128 | #endif | |
2129 | ||
2130 | struct proto tcpv6_prot = { | |
2131 | .name = "TCPv6", | |
2132 | .owner = THIS_MODULE, | |
2133 | .close = tcp_close, | |
2134 | .connect = tcp_v6_connect, | |
2135 | .disconnect = tcp_disconnect, | |
463c84b9 | 2136 | .accept = inet_csk_accept, |
1da177e4 LT |
2137 | .ioctl = tcp_ioctl, |
2138 | .init = tcp_v6_init_sock, | |
2139 | .destroy = tcp_v6_destroy_sock, | |
2140 | .shutdown = tcp_shutdown, | |
2141 | .setsockopt = tcp_setsockopt, | |
2142 | .getsockopt = tcp_getsockopt, | |
1da177e4 LT |
2143 | .recvmsg = tcp_recvmsg, |
2144 | .backlog_rcv = tcp_v6_do_rcv, | |
2145 | .hash = tcp_v6_hash, | |
ab1e0a13 ACM |
2146 | .unhash = inet_unhash, |
2147 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2148 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2149 | .sockets_allocated = &tcp_sockets_allocated, | |
2150 | .memory_allocated = &tcp_memory_allocated, | |
2151 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2152 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2153 | .sysctl_mem = sysctl_tcp_mem, |
2154 | .sysctl_wmem = sysctl_tcp_wmem, | |
2155 | .sysctl_rmem = sysctl_tcp_rmem, | |
2156 | .max_header = MAX_TCP_HEADER, | |
2157 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 2158 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 2159 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2160 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2161 | .h.hashinfo = &tcp_hashinfo, |
543d9cfe ACM |
2162 | #ifdef CONFIG_COMPAT |
2163 | .compat_setsockopt = compat_tcp_setsockopt, | |
2164 | .compat_getsockopt = compat_tcp_getsockopt, | |
2165 | #endif | |
1da177e4 LT |
2166 | }; |
2167 | ||
41135cc8 | 2168 | static const struct inet6_protocol tcpv6_protocol = { |
1da177e4 LT |
2169 | .handler = tcp_v6_rcv, |
2170 | .err_handler = tcp_v6_err, | |
a430a43d | 2171 | .gso_send_check = tcp_v6_gso_send_check, |
adcfc7d0 | 2172 | .gso_segment = tcp_tso_segment, |
684f2176 HX |
2173 | .gro_receive = tcp6_gro_receive, |
2174 | .gro_complete = tcp6_gro_complete, | |
1da177e4 LT |
2175 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
2176 | }; | |
2177 | ||
1da177e4 LT |
2178 | static struct inet_protosw tcpv6_protosw = { |
2179 | .type = SOCK_STREAM, | |
2180 | .protocol = IPPROTO_TCP, | |
2181 | .prot = &tcpv6_prot, | |
2182 | .ops = &inet6_stream_ops, | |
1da177e4 | 2183 | .no_check = 0, |
d83d8461 ACM |
2184 | .flags = INET_PROTOSW_PERMANENT | |
2185 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2186 | }; |
2187 | ||
2c8c1e72 | 2188 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 2189 | { |
5677242f DL |
2190 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2191 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2192 | } |
2193 | ||
2c8c1e72 | 2194 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 2195 | { |
5677242f | 2196 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
2197 | } |
2198 | ||
2c8c1e72 | 2199 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
2200 | { |
2201 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
2202 | } |
2203 | ||
2204 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
2205 | .init = tcpv6_net_init, |
2206 | .exit = tcpv6_net_exit, | |
2207 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
2208 | }; |
2209 | ||
7f4e4868 | 2210 | int __init tcpv6_init(void) |
1da177e4 | 2211 | { |
7f4e4868 DL |
2212 | int ret; |
2213 | ||
2214 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2215 | if (ret) | |
2216 | goto out; | |
2217 | ||
1da177e4 | 2218 | /* register inet6 protocol */ |
7f4e4868 DL |
2219 | ret = inet6_register_protosw(&tcpv6_protosw); |
2220 | if (ret) | |
2221 | goto out_tcpv6_protocol; | |
2222 | ||
93ec926b | 2223 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2224 | if (ret) |
2225 | goto out_tcpv6_protosw; | |
2226 | out: | |
2227 | return ret; | |
ae0f7d5f | 2228 | |
7f4e4868 DL |
2229 | out_tcpv6_protocol: |
2230 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2231 | out_tcpv6_protosw: | |
2232 | inet6_unregister_protosw(&tcpv6_protosw); | |
2233 | goto out; | |
2234 | } | |
2235 | ||
09f7709f | 2236 | void tcpv6_exit(void) |
7f4e4868 | 2237 | { |
93ec926b | 2238 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2239 | inet6_unregister_protosw(&tcpv6_protosw); |
2240 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2241 | } |