Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * TCP over IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1ab1457c | 8 | * Based on: |
1da177e4 LT |
9 | * linux/net/ipv4/tcp.c |
10 | * linux/net/ipv4/tcp_input.c | |
11 | * linux/net/ipv4/tcp_output.c | |
12 | * | |
13 | * Fixes: | |
14 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
15 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
16 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
17 | * a single port at the same time. | |
18 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file. | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or | |
21 | * modify it under the terms of the GNU General Public License | |
22 | * as published by the Free Software Foundation; either version | |
23 | * 2 of the License, or (at your option) any later version. | |
24 | */ | |
25 | ||
eb4dea58 | 26 | #include <linux/bottom_half.h> |
1da177e4 | 27 | #include <linux/module.h> |
1da177e4 LT |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/socket.h> | |
31 | #include <linux/sockios.h> | |
32 | #include <linux/net.h> | |
33 | #include <linux/jiffies.h> | |
34 | #include <linux/in.h> | |
35 | #include <linux/in6.h> | |
36 | #include <linux/netdevice.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/jhash.h> | |
39 | #include <linux/ipsec.h> | |
40 | #include <linux/times.h> | |
5a0e3ad6 | 41 | #include <linux/slab.h> |
1da177e4 LT |
42 | |
43 | #include <linux/ipv6.h> | |
44 | #include <linux/icmpv6.h> | |
45 | #include <linux/random.h> | |
46 | ||
47 | #include <net/tcp.h> | |
48 | #include <net/ndisc.h> | |
5324a040 | 49 | #include <net/inet6_hashtables.h> |
8129765a | 50 | #include <net/inet6_connection_sock.h> |
1da177e4 LT |
51 | #include <net/ipv6.h> |
52 | #include <net/transp_v6.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/ip6_route.h> | |
55 | #include <net/ip6_checksum.h> | |
56 | #include <net/inet_ecn.h> | |
57 | #include <net/protocol.h> | |
58 | #include <net/xfrm.h> | |
1da177e4 LT |
59 | #include <net/snmp.h> |
60 | #include <net/dsfield.h> | |
6d6ee43e | 61 | #include <net/timewait_sock.h> |
18134bed | 62 | #include <net/netdma.h> |
3d58b5fa | 63 | #include <net/inet_common.h> |
1da177e4 LT |
64 | |
65 | #include <asm/uaccess.h> | |
66 | ||
67 | #include <linux/proc_fs.h> | |
68 | #include <linux/seq_file.h> | |
69 | ||
cfb6eeb4 YH |
70 | #include <linux/crypto.h> |
71 | #include <linux/scatterlist.h> | |
72 | ||
cfb6eeb4 | 73 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
6edafaaf GJ |
74 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
75 | struct request_sock *req); | |
1da177e4 LT |
76 | |
77 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
8ad50d96 HX |
78 | static void __tcp_v6_send_check(struct sk_buff *skb, |
79 | struct in6_addr *saddr, | |
80 | struct in6_addr *daddr); | |
1da177e4 | 81 | |
3b401a81 SH |
82 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
83 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 84 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
85 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
86 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
87 | #else |
88 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
89 | struct in6_addr *addr) | |
90 | { | |
91 | return NULL; | |
92 | } | |
a928630a | 93 | #endif |
1da177e4 | 94 | |
1da177e4 LT |
95 | static void tcp_v6_hash(struct sock *sk) |
96 | { | |
97 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 98 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
99 | tcp_prot.hash(sk); |
100 | return; | |
101 | } | |
102 | local_bh_disable(); | |
9327f705 | 103 | __inet6_hash(sk, NULL); |
1da177e4 LT |
104 | local_bh_enable(); |
105 | } | |
106 | } | |
107 | ||
684f2176 | 108 | static __inline__ __sum16 tcp_v6_check(int len, |
1ab1457c YH |
109 | struct in6_addr *saddr, |
110 | struct in6_addr *daddr, | |
868c86bc | 111 | __wsum base) |
1da177e4 LT |
112 | { |
113 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
114 | } | |
115 | ||
a94f723d | 116 | static __u32 tcp_v6_init_sequence(struct sk_buff *skb) |
1da177e4 | 117 | { |
0660e03f ACM |
118 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
119 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
120 | tcp_hdr(skb)->dest, |
121 | tcp_hdr(skb)->source); | |
1da177e4 LT |
122 | } |
123 | ||
1ab1457c | 124 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
125 | int addr_len) |
126 | { | |
127 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 128 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 129 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
130 | struct ipv6_pinfo *np = inet6_sk(sk); |
131 | struct tcp_sock *tp = tcp_sk(sk); | |
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) |
a02cec21 | 142 | return -EAFNOSUPPORT; |
1da177e4 LT |
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 | |
8ad50d96 HX |
909 | static void __tcp_v6_send_check(struct sk_buff *skb, |
910 | struct in6_addr *saddr, struct in6_addr *daddr) | |
1da177e4 | 911 | { |
aa8223c7 | 912 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 913 | |
84fa7933 | 914 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
8ad50d96 | 915 | th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0); |
663ead3b | 916 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 917 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 918 | } else { |
8ad50d96 HX |
919 | th->check = tcp_v6_check(skb->len, saddr, daddr, |
920 | csum_partial(th, th->doff << 2, | |
921 | skb->csum)); | |
1da177e4 LT |
922 | } |
923 | } | |
924 | ||
bb296246 | 925 | static void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
8ad50d96 HX |
926 | { |
927 | struct ipv6_pinfo *np = inet6_sk(sk); | |
928 | ||
929 | __tcp_v6_send_check(skb, &np->saddr, &np->daddr); | |
930 | } | |
931 | ||
a430a43d HX |
932 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
933 | { | |
934 | struct ipv6hdr *ipv6h; | |
935 | struct tcphdr *th; | |
936 | ||
937 | if (!pskb_may_pull(skb, sizeof(*th))) | |
938 | return -EINVAL; | |
939 | ||
0660e03f | 940 | ipv6h = ipv6_hdr(skb); |
aa8223c7 | 941 | th = tcp_hdr(skb); |
a430a43d HX |
942 | |
943 | th->check = 0; | |
84fa7933 | 944 | skb->ip_summed = CHECKSUM_PARTIAL; |
8ad50d96 | 945 | __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr); |
a430a43d HX |
946 | return 0; |
947 | } | |
1da177e4 | 948 | |
36990673 HX |
949 | static struct sk_buff **tcp6_gro_receive(struct sk_buff **head, |
950 | struct sk_buff *skb) | |
684f2176 | 951 | { |
36e7b1b8 | 952 | struct ipv6hdr *iph = skb_gro_network_header(skb); |
684f2176 HX |
953 | |
954 | switch (skb->ip_summed) { | |
955 | case CHECKSUM_COMPLETE: | |
86911732 | 956 | if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr, |
684f2176 HX |
957 | skb->csum)) { |
958 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
959 | break; | |
960 | } | |
961 | ||
962 | /* fall through */ | |
963 | case CHECKSUM_NONE: | |
964 | NAPI_GRO_CB(skb)->flush = 1; | |
965 | return NULL; | |
966 | } | |
967 | ||
968 | return tcp_gro_receive(head, skb); | |
969 | } | |
684f2176 | 970 | |
36990673 | 971 | static int tcp6_gro_complete(struct sk_buff *skb) |
684f2176 HX |
972 | { |
973 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
974 | struct tcphdr *th = tcp_hdr(skb); | |
975 | ||
976 | th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb), | |
977 | &iph->saddr, &iph->daddr, 0); | |
978 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
979 | ||
980 | return tcp_gro_complete(skb); | |
981 | } | |
684f2176 | 982 | |
626e264d IJ |
983 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
984 | u32 ts, struct tcp_md5sig_key *key, int rst) | |
1da177e4 | 985 | { |
aa8223c7 | 986 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
987 | struct sk_buff *buff; |
988 | struct flowi fl; | |
adf30907 | 989 | struct net *net = dev_net(skb_dst(skb)->dev); |
e5047992 | 990 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 991 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 992 | struct dst_entry *dst; |
81ada62d | 993 | __be32 *topt; |
1da177e4 | 994 | |
626e264d IJ |
995 | if (ts) |
996 | tot_len += TCPOLEN_TSTAMP_ALIGNED; | |
cfb6eeb4 | 997 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
998 | if (key) |
999 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
1000 | #endif | |
1001 | ||
cfb6eeb4 | 1002 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 1003 | GFP_ATOMIC); |
1ab1457c YH |
1004 | if (buff == NULL) |
1005 | return; | |
1da177e4 | 1006 | |
cfb6eeb4 | 1007 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 1008 | |
cfb6eeb4 | 1009 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 1010 | skb_reset_transport_header(buff); |
1da177e4 LT |
1011 | |
1012 | /* Swap the send and the receive. */ | |
1013 | memset(t1, 0, sizeof(*t1)); | |
1014 | t1->dest = th->source; | |
1015 | t1->source = th->dest; | |
cfb6eeb4 | 1016 | t1->doff = tot_len / 4; |
626e264d IJ |
1017 | t1->seq = htonl(seq); |
1018 | t1->ack_seq = htonl(ack); | |
1019 | t1->ack = !rst || !th->ack; | |
1020 | t1->rst = rst; | |
1021 | t1->window = htons(win); | |
1da177e4 | 1022 | |
81ada62d IJ |
1023 | topt = (__be32 *)(t1 + 1); |
1024 | ||
626e264d IJ |
1025 | if (ts) { |
1026 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
1027 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
1028 | *topt++ = htonl(tcp_time_stamp); | |
1029 | *topt++ = htonl(ts); | |
1030 | } | |
1031 | ||
cfb6eeb4 YH |
1032 | #ifdef CONFIG_TCP_MD5SIG |
1033 | if (key) { | |
81ada62d IJ |
1034 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
1035 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
1036 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
1037 | &ipv6_hdr(skb)->saddr, |
1038 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
1039 | } |
1040 | #endif | |
1041 | ||
1da177e4 | 1042 | memset(&fl, 0, sizeof(fl)); |
0660e03f ACM |
1043 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
1044 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 | 1045 | |
e5700aff DM |
1046 | buff->ip_summed = CHECKSUM_PARTIAL; |
1047 | buff->csum = 0; | |
1048 | ||
8ad50d96 | 1049 | __tcp_v6_send_check(buff, &fl.fl6_src, &fl.fl6_dst); |
1da177e4 LT |
1050 | |
1051 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 1052 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
1053 | fl.fl_ip_dport = t1->dest; |
1054 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 1055 | security_skb_classify_flow(skb, &fl); |
1da177e4 | 1056 | |
c20121ae DL |
1057 | /* Pass a socket to ip6_dst_lookup either it is for RST |
1058 | * Underlying function will use this to retrieve the network | |
1059 | * namespace | |
1060 | */ | |
adf30907 ED |
1061 | if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) { |
1062 | if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) { | |
1063 | skb_dst_set(buff, dst); | |
4e15ed4d | 1064 | ip6_xmit(ctl_sk, buff, &fl, NULL); |
63231bdd | 1065 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
626e264d IJ |
1066 | if (rst) |
1067 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
1da177e4 | 1068 | return; |
ecc51b6d | 1069 | } |
1da177e4 LT |
1070 | } |
1071 | ||
1072 | kfree_skb(buff); | |
1073 | } | |
1074 | ||
626e264d | 1075 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1076 | { |
626e264d IJ |
1077 | struct tcphdr *th = tcp_hdr(skb); |
1078 | u32 seq = 0, ack_seq = 0; | |
fa3e5b4e | 1079 | struct tcp_md5sig_key *key = NULL; |
1da177e4 | 1080 | |
626e264d | 1081 | if (th->rst) |
1da177e4 LT |
1082 | return; |
1083 | ||
626e264d IJ |
1084 | if (!ipv6_unicast_destination(skb)) |
1085 | return; | |
1da177e4 | 1086 | |
cfb6eeb4 | 1087 | #ifdef CONFIG_TCP_MD5SIG |
626e264d IJ |
1088 | if (sk) |
1089 | key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr); | |
cfb6eeb4 YH |
1090 | #endif |
1091 | ||
626e264d IJ |
1092 | if (th->ack) |
1093 | seq = ntohl(th->ack_seq); | |
1094 | else | |
1095 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
1096 | (th->doff << 2); | |
1da177e4 | 1097 | |
626e264d IJ |
1098 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1); |
1099 | } | |
1da177e4 | 1100 | |
626e264d IJ |
1101 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts, |
1102 | struct tcp_md5sig_key *key) | |
1103 | { | |
1104 | tcp_v6_send_response(skb, seq, ack, win, ts, key, 0); | |
1da177e4 LT |
1105 | } |
1106 | ||
1107 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1108 | { | |
8feaf0c0 | 1109 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 1110 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 1111 | |
9501f972 | 1112 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 1113 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
9501f972 | 1114 | tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw)); |
1da177e4 | 1115 | |
8feaf0c0 | 1116 | inet_twsk_put(tw); |
1da177e4 LT |
1117 | } |
1118 | ||
6edafaaf GJ |
1119 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
1120 | struct request_sock *req) | |
1da177e4 | 1121 | { |
9501f972 | 1122 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent, |
6edafaaf | 1123 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr)); |
1da177e4 LT |
1124 | } |
1125 | ||
1126 | ||
1127 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
1128 | { | |
60236fdd | 1129 | struct request_sock *req, **prev; |
aa8223c7 | 1130 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
1131 | struct sock *nsk; |
1132 | ||
1133 | /* Find possible connection requests. */ | |
8129765a | 1134 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
1135 | &ipv6_hdr(skb)->saddr, |
1136 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 LT |
1137 | if (req) |
1138 | return tcp_check_req(sk, skb, req, prev); | |
1139 | ||
3b1e0a65 | 1140 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
1141 | &ipv6_hdr(skb)->saddr, th->source, |
1142 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
1143 | |
1144 | if (nsk) { | |
1145 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1146 | bh_lock_sock(nsk); | |
1147 | return nsk; | |
1148 | } | |
9469c7b4 | 1149 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1150 | return NULL; |
1151 | } | |
1152 | ||
c6aefafb | 1153 | #ifdef CONFIG_SYN_COOKIES |
af9b4738 | 1154 | if (!th->syn) |
c6aefafb | 1155 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1156 | #endif |
1157 | return sk; | |
1158 | } | |
1159 | ||
1da177e4 LT |
1160 | /* FIXME: this is substantially similar to the ipv4 code. |
1161 | * Can some kind of merge be done? -- erics | |
1162 | */ | |
1163 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1164 | { | |
4957faad | 1165 | struct tcp_extend_values tmp_ext; |
e6b4d113 | 1166 | struct tcp_options_received tmp_opt; |
4957faad | 1167 | u8 *hash_location; |
e6b4d113 | 1168 | struct request_sock *req; |
ca304b61 | 1169 | struct inet6_request_sock *treq; |
1da177e4 | 1170 | struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 | 1171 | struct tcp_sock *tp = tcp_sk(sk); |
e6b4d113 | 1172 | __u32 isn = TCP_SKB_CB(skb)->when; |
c6aefafb GG |
1173 | #ifdef CONFIG_SYN_COOKIES |
1174 | int want_cookie = 0; | |
1175 | #else | |
1176 | #define want_cookie 0 | |
1177 | #endif | |
1da177e4 LT |
1178 | |
1179 | if (skb->protocol == htons(ETH_P_IP)) | |
1180 | return tcp_v4_conn_request(sk, skb); | |
1181 | ||
1182 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1183 | goto drop; |
1da177e4 | 1184 | |
463c84b9 | 1185 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 | 1186 | if (net_ratelimit()) |
c6aefafb GG |
1187 | syn_flood_warning(skb); |
1188 | #ifdef CONFIG_SYN_COOKIES | |
1189 | if (sysctl_tcp_syncookies) | |
1190 | want_cookie = 1; | |
1191 | else | |
1192 | #endif | |
1ab1457c | 1193 | goto drop; |
1da177e4 LT |
1194 | } |
1195 | ||
463c84b9 | 1196 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1197 | goto drop; |
1198 | ||
ca304b61 | 1199 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1200 | if (req == NULL) |
1201 | goto drop; | |
1202 | ||
cfb6eeb4 YH |
1203 | #ifdef CONFIG_TCP_MD5SIG |
1204 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
1205 | #endif | |
1206 | ||
1da177e4 LT |
1207 | tcp_clear_options(&tmp_opt); |
1208 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1209 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
bb5b7c11 | 1210 | tcp_parse_options(skb, &tmp_opt, &hash_location, 0); |
4957faad WAS |
1211 | |
1212 | if (tmp_opt.cookie_plus > 0 && | |
1213 | tmp_opt.saw_tstamp && | |
1214 | !tp->rx_opt.cookie_out_never && | |
1215 | (sysctl_tcp_cookie_size > 0 || | |
1216 | (tp->cookie_values != NULL && | |
1217 | tp->cookie_values->cookie_desired > 0))) { | |
1218 | u8 *c; | |
1219 | u32 *d; | |
1220 | u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS]; | |
1221 | int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE; | |
1222 | ||
1223 | if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0) | |
1224 | goto drop_and_free; | |
1225 | ||
1226 | /* Secret recipe starts with IP addresses */ | |
0eae88f3 | 1227 | d = (__force u32 *)&ipv6_hdr(skb)->daddr.s6_addr32[0]; |
4957faad WAS |
1228 | *mess++ ^= *d++; |
1229 | *mess++ ^= *d++; | |
1230 | *mess++ ^= *d++; | |
1231 | *mess++ ^= *d++; | |
0eae88f3 | 1232 | d = (__force u32 *)&ipv6_hdr(skb)->saddr.s6_addr32[0]; |
4957faad WAS |
1233 | *mess++ ^= *d++; |
1234 | *mess++ ^= *d++; | |
1235 | *mess++ ^= *d++; | |
1236 | *mess++ ^= *d++; | |
1237 | ||
1238 | /* plus variable length Initiator Cookie */ | |
1239 | c = (u8 *)mess; | |
1240 | while (l-- > 0) | |
1241 | *c++ ^= *hash_location++; | |
1da177e4 | 1242 | |
4957faad WAS |
1243 | #ifdef CONFIG_SYN_COOKIES |
1244 | want_cookie = 0; /* not our kind of cookie */ | |
1245 | #endif | |
1246 | tmp_ext.cookie_out_never = 0; /* false */ | |
1247 | tmp_ext.cookie_plus = tmp_opt.cookie_plus; | |
1248 | } else if (!tp->rx_opt.cookie_in_always) { | |
1249 | /* redundant indications, but ensure initialization. */ | |
1250 | tmp_ext.cookie_out_never = 1; /* true */ | |
1251 | tmp_ext.cookie_plus = 0; | |
1252 | } else { | |
1253 | goto drop_and_free; | |
1254 | } | |
1255 | tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always; | |
1da177e4 | 1256 | |
4dfc2817 | 1257 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 1258 | tcp_clear_options(&tmp_opt); |
c6aefafb | 1259 | |
1da177e4 LT |
1260 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1261 | tcp_openreq_init(req, &tmp_opt, skb); | |
1262 | ||
ca304b61 | 1263 | treq = inet6_rsk(req); |
0660e03f ACM |
1264 | ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr); |
1265 | ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr); | |
172d69e6 | 1266 | if (!want_cookie || tmp_opt.tstamp_ok) |
c6aefafb GG |
1267 | TCP_ECN_create_request(req, tcp_hdr(skb)); |
1268 | ||
2bbdf389 | 1269 | if (!isn) { |
c6aefafb GG |
1270 | if (ipv6_opt_accepted(sk, skb) || |
1271 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1272 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1273 | atomic_inc(&skb->users); | |
1274 | treq->pktopts = skb; | |
1275 | } | |
1276 | treq->iif = sk->sk_bound_dev_if; | |
1da177e4 | 1277 | |
c6aefafb GG |
1278 | /* So that link locals have meaning */ |
1279 | if (!sk->sk_bound_dev_if && | |
1280 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1281 | treq->iif = inet6_iif(skb); | |
2bbdf389 FW |
1282 | if (!want_cookie) { |
1283 | isn = tcp_v6_init_sequence(skb); | |
1284 | } else { | |
1285 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); | |
1286 | req->cookie_ts = tmp_opt.tstamp_ok; | |
1287 | } | |
c6aefafb | 1288 | } |
2e6599cb | 1289 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1290 | |
4237c75c VY |
1291 | security_inet_conn_request(sk, skb, req); |
1292 | ||
4957faad WAS |
1293 | if (tcp_v6_send_synack(sk, req, |
1294 | (struct request_values *)&tmp_ext) || | |
1295 | want_cookie) | |
e6b4d113 | 1296 | goto drop_and_free; |
1da177e4 | 1297 | |
e6b4d113 WAS |
1298 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1299 | return 0; | |
1da177e4 | 1300 | |
e6b4d113 WAS |
1301 | drop_and_free: |
1302 | reqsk_free(req); | |
1da177e4 | 1303 | drop: |
1da177e4 LT |
1304 | return 0; /* don't send reset */ |
1305 | } | |
1306 | ||
1307 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1308 | struct request_sock *req, |
1da177e4 LT |
1309 | struct dst_entry *dst) |
1310 | { | |
78d15e82 | 1311 | struct inet6_request_sock *treq; |
1da177e4 LT |
1312 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1313 | struct tcp6_sock *newtcp6sk; | |
1314 | struct inet_sock *newinet; | |
1315 | struct tcp_sock *newtp; | |
1316 | struct sock *newsk; | |
1317 | struct ipv6_txoptions *opt; | |
cfb6eeb4 YH |
1318 | #ifdef CONFIG_TCP_MD5SIG |
1319 | struct tcp_md5sig_key *key; | |
1320 | #endif | |
1da177e4 LT |
1321 | |
1322 | if (skb->protocol == htons(ETH_P_IP)) { | |
1323 | /* | |
1324 | * v6 mapped | |
1325 | */ | |
1326 | ||
1327 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1328 | ||
1ab1457c | 1329 | if (newsk == NULL) |
1da177e4 LT |
1330 | return NULL; |
1331 | ||
1332 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1333 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1334 | ||
1335 | newinet = inet_sk(newsk); | |
1336 | newnp = inet6_sk(newsk); | |
1337 | newtp = tcp_sk(newsk); | |
1338 | ||
1339 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1340 | ||
c720c7e8 | 1341 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); |
1da177e4 | 1342 | |
c720c7e8 | 1343 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 LT |
1344 | |
1345 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1346 | ||
8292a17a | 1347 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1348 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1349 | #ifdef CONFIG_TCP_MD5SIG |
1350 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1351 | #endif | |
1352 | ||
1da177e4 LT |
1353 | newnp->pktoptions = NULL; |
1354 | newnp->opt = NULL; | |
505cbfc5 | 1355 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1356 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 | 1357 | |
e6848976 ACM |
1358 | /* |
1359 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1360 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1361 | * that function for the gory details. -acme | |
1da177e4 | 1362 | */ |
1da177e4 LT |
1363 | |
1364 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1365 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1366 | Sync it now. |
1367 | */ | |
d83d8461 | 1368 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1369 | |
1370 | return newsk; | |
1371 | } | |
1372 | ||
78d15e82 | 1373 | treq = inet6_rsk(req); |
1da177e4 LT |
1374 | opt = np->opt; |
1375 | ||
1376 | if (sk_acceptq_is_full(sk)) | |
1377 | goto out_overflow; | |
1378 | ||
1da177e4 | 1379 | if (dst == NULL) { |
20c59de2 | 1380 | struct in6_addr *final_p, final; |
1da177e4 LT |
1381 | struct flowi fl; |
1382 | ||
1383 | memset(&fl, 0, sizeof(fl)); | |
1384 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1385 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
20c59de2 | 1386 | final_p = fl6_update_dst(&fl, opt, &final); |
2e6599cb | 1387 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1388 | fl.oif = sk->sk_bound_dev_if; |
51953d5b | 1389 | fl.mark = sk->sk_mark; |
2e6599cb | 1390 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
fd507037 | 1391 | fl.fl_ip_sport = inet_rsk(req)->loc_port; |
4237c75c | 1392 | security_req_classify_flow(req, &fl); |
1da177e4 LT |
1393 | |
1394 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1395 | goto out; | |
1396 | ||
1397 | if (final_p) | |
1398 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1399 | ||
52479b62 | 1400 | if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) |
1da177e4 | 1401 | goto out; |
1ab1457c | 1402 | } |
1da177e4 LT |
1403 | |
1404 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1405 | if (newsk == NULL) | |
093d2823 | 1406 | goto out_nonewsk; |
1da177e4 | 1407 | |
e6848976 ACM |
1408 | /* |
1409 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1410 | * count here, tcp_create_openreq_child now does this for us, see the | |
1411 | * comment in that function for the gory details. -acme | |
1412 | */ | |
1da177e4 | 1413 | |
59eed279 | 1414 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1415 | __ip6_dst_store(newsk, dst, NULL, NULL); |
1da177e4 LT |
1416 | |
1417 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1418 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1419 | ||
1420 | newtp = tcp_sk(newsk); | |
1421 | newinet = inet_sk(newsk); | |
1422 | newnp = inet6_sk(newsk); | |
1423 | ||
1424 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1425 | ||
2e6599cb ACM |
1426 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1427 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1428 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1429 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 | 1430 | |
1ab1457c | 1431 | /* Now IPv6 options... |
1da177e4 LT |
1432 | |
1433 | First: no IPv4 options. | |
1434 | */ | |
1435 | newinet->opt = NULL; | |
d35690be | 1436 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1437 | |
1438 | /* Clone RX bits */ | |
1439 | newnp->rxopt.all = np->rxopt.all; | |
1440 | ||
1441 | /* Clone pktoptions received with SYN */ | |
1442 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1443 | if (treq->pktopts != NULL) { |
1444 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1445 | kfree_skb(treq->pktopts); | |
1446 | treq->pktopts = NULL; | |
1da177e4 LT |
1447 | if (newnp->pktoptions) |
1448 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1449 | } | |
1450 | newnp->opt = NULL; | |
505cbfc5 | 1451 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1452 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
1453 | |
1454 | /* Clone native IPv6 options from listening socket (if any) | |
1455 | ||
1456 | Yes, keeping reference count would be much more clever, | |
1457 | but we make one more one thing there: reattach optmem | |
1458 | to newsk. | |
1459 | */ | |
1460 | if (opt) { | |
1461 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1462 | if (opt != np->opt) | |
1463 | sock_kfree_s(sk, opt, opt->tot_len); | |
1464 | } | |
1465 | ||
d83d8461 | 1466 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1467 | if (newnp->opt) |
d83d8461 ACM |
1468 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1469 | newnp->opt->opt_flen); | |
1da177e4 | 1470 | |
5d424d5a | 1471 | tcp_mtup_init(newsk); |
1da177e4 LT |
1472 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1473 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1474 | tcp_initialize_rcv_mss(newsk); | |
1475 | ||
c720c7e8 ED |
1476 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1477 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1478 | |
cfb6eeb4 YH |
1479 | #ifdef CONFIG_TCP_MD5SIG |
1480 | /* Copy over the MD5 key from the original socket */ | |
1481 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1482 | /* We're using one, so create a matching key | |
1483 | * on the newsk structure. If we fail to get | |
1484 | * memory, then we end up not copying the key | |
1485 | * across. Shucks. | |
1486 | */ | |
af879cc7 ACM |
1487 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1488 | if (newkey != NULL) | |
e547bc1e | 1489 | tcp_v6_md5_do_add(newsk, &newnp->daddr, |
cfb6eeb4 | 1490 | newkey, key->keylen); |
cfb6eeb4 YH |
1491 | } |
1492 | #endif | |
1493 | ||
093d2823 BS |
1494 | if (__inet_inherit_port(sk, newsk) < 0) { |
1495 | sock_put(newsk); | |
1496 | goto out; | |
1497 | } | |
9327f705 | 1498 | __inet6_hash(newsk, NULL); |
1da177e4 LT |
1499 | |
1500 | return newsk; | |
1501 | ||
1502 | out_overflow: | |
de0744af | 1503 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1504 | out_nonewsk: |
1da177e4 LT |
1505 | if (opt && opt != np->opt) |
1506 | sock_kfree_s(sk, opt, opt->tot_len); | |
1507 | dst_release(dst); | |
093d2823 BS |
1508 | out: |
1509 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); | |
1da177e4 LT |
1510 | return NULL; |
1511 | } | |
1512 | ||
b51655b9 | 1513 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1514 | { |
84fa7933 | 1515 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
684f2176 | 1516 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1517 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1518 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1519 | return 0; |
fb286bb2 | 1520 | } |
1da177e4 | 1521 | } |
fb286bb2 | 1522 | |
684f2176 | 1523 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
0660e03f ACM |
1524 | &ipv6_hdr(skb)->saddr, |
1525 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1526 | |
1da177e4 | 1527 | if (skb->len <= 76) { |
fb286bb2 | 1528 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1529 | } |
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | /* The socket must have it's spinlock held when we get | |
1534 | * here. | |
1535 | * | |
1536 | * We have a potential double-lock case here, so even when | |
1537 | * doing backlog processing we use the BH locking scheme. | |
1538 | * This is because we cannot sleep with the original spinlock | |
1539 | * held. | |
1540 | */ | |
1541 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1542 | { | |
1543 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1544 | struct tcp_sock *tp; | |
1545 | struct sk_buff *opt_skb = NULL; | |
1546 | ||
1547 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1548 | goes to IPv4 receive handler and backlogged. | |
1549 | From backlog it always goes here. Kerboom... | |
1550 | Fortunately, tcp_rcv_established and rcv_established | |
1551 | handle them correctly, but it is not case with | |
1552 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1553 | */ | |
1554 | ||
1555 | if (skb->protocol == htons(ETH_P_IP)) | |
1556 | return tcp_v4_do_rcv(sk, skb); | |
1557 | ||
cfb6eeb4 YH |
1558 | #ifdef CONFIG_TCP_MD5SIG |
1559 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1560 | goto discard; | |
1561 | #endif | |
1562 | ||
fda9ef5d | 1563 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1564 | goto discard; |
1565 | ||
1566 | /* | |
1567 | * socket locking is here for SMP purposes as backlog rcv | |
1568 | * is currently called with bh processing disabled. | |
1569 | */ | |
1570 | ||
1571 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1572 | ||
1573 | Yes, guys, it is the only place in our code, where we | |
1574 | may make it not affecting IPv4. | |
1575 | The rest of code is protocol independent, | |
1576 | and I do not like idea to uglify IPv4. | |
1577 | ||
1578 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1579 | looks not very well thought. For now we latch | |
1580 | options, received in the last packet, enqueued | |
1581 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1582 | --ANK (980728) |
1da177e4 LT |
1583 | */ |
1584 | if (np->rxopt.all) | |
1585 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1586 | ||
1587 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1588 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1589 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1590 | goto reset; |
1591 | TCP_CHECK_TIMER(sk); | |
1592 | if (opt_skb) | |
1593 | goto ipv6_pktoptions; | |
1594 | return 0; | |
1595 | } | |
1596 | ||
ab6a5bb6 | 1597 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1598 | goto csum_err; |
1599 | ||
1ab1457c | 1600 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1601 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1602 | if (!nsk) | |
1603 | goto discard; | |
1604 | ||
1605 | /* | |
1606 | * Queue it on the new socket if the new socket is active, | |
1607 | * otherwise we just shortcircuit this and continue with | |
1608 | * the new socket.. | |
1609 | */ | |
1ab1457c | 1610 | if(nsk != sk) { |
1da177e4 LT |
1611 | if (tcp_child_process(sk, nsk, skb)) |
1612 | goto reset; | |
1613 | if (opt_skb) | |
1614 | __kfree_skb(opt_skb); | |
1615 | return 0; | |
1616 | } | |
1617 | } | |
1618 | ||
1619 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1620 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1621 | goto reset; |
1622 | TCP_CHECK_TIMER(sk); | |
1623 | if (opt_skb) | |
1624 | goto ipv6_pktoptions; | |
1625 | return 0; | |
1626 | ||
1627 | reset: | |
cfb6eeb4 | 1628 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1629 | discard: |
1630 | if (opt_skb) | |
1631 | __kfree_skb(opt_skb); | |
1632 | kfree_skb(skb); | |
1633 | return 0; | |
1634 | csum_err: | |
63231bdd | 1635 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1636 | goto discard; |
1637 | ||
1638 | ||
1639 | ipv6_pktoptions: | |
1640 | /* Do you ask, what is it? | |
1641 | ||
1642 | 1. skb was enqueued by tcp. | |
1643 | 2. skb is added to tail of read queue, rather than out of order. | |
1644 | 3. socket is not in passive state. | |
1645 | 4. Finally, it really contains options, which user wants to receive. | |
1646 | */ | |
1647 | tp = tcp_sk(sk); | |
1648 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1649 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1650 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1651 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1652 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1653 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
1da177e4 LT |
1654 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1655 | skb_set_owner_r(opt_skb, sk); | |
1656 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1657 | } else { | |
1658 | __kfree_skb(opt_skb); | |
1659 | opt_skb = xchg(&np->pktoptions, NULL); | |
1660 | } | |
1661 | } | |
1662 | ||
800d55f1 | 1663 | kfree_skb(opt_skb); |
1da177e4 LT |
1664 | return 0; |
1665 | } | |
1666 | ||
e5bbef20 | 1667 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1668 | { |
1ab1457c | 1669 | struct tcphdr *th; |
e802af9c | 1670 | struct ipv6hdr *hdr; |
1da177e4 LT |
1671 | struct sock *sk; |
1672 | int ret; | |
a86b1e30 | 1673 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1674 | |
1675 | if (skb->pkt_type != PACKET_HOST) | |
1676 | goto discard_it; | |
1677 | ||
1678 | /* | |
1679 | * Count it even if it's bad. | |
1680 | */ | |
63231bdd | 1681 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1682 | |
1683 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1684 | goto discard_it; | |
1685 | ||
aa8223c7 | 1686 | th = tcp_hdr(skb); |
1da177e4 LT |
1687 | |
1688 | if (th->doff < sizeof(struct tcphdr)/4) | |
1689 | goto bad_packet; | |
1690 | if (!pskb_may_pull(skb, th->doff*4)) | |
1691 | goto discard_it; | |
1692 | ||
60476372 | 1693 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1da177e4 LT |
1694 | goto bad_packet; |
1695 | ||
aa8223c7 | 1696 | th = tcp_hdr(skb); |
e802af9c | 1697 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
1698 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1699 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1700 | skb->len - th->doff*4); | |
1701 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1702 | TCP_SKB_CB(skb)->when = 0; | |
e802af9c | 1703 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(hdr); |
1da177e4 LT |
1704 | TCP_SKB_CB(skb)->sacked = 0; |
1705 | ||
9a1f27c4 | 1706 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1707 | if (!sk) |
1708 | goto no_tcp_socket; | |
1709 | ||
1710 | process: | |
1711 | if (sk->sk_state == TCP_TIME_WAIT) | |
1712 | goto do_time_wait; | |
1713 | ||
e802af9c SH |
1714 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1715 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1716 | goto discard_and_relse; | |
1717 | } | |
1718 | ||
1da177e4 LT |
1719 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1720 | goto discard_and_relse; | |
1721 | ||
fda9ef5d | 1722 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1723 | goto discard_and_relse; |
1724 | ||
1725 | skb->dev = NULL; | |
1726 | ||
293b9c42 | 1727 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1728 | ret = 0; |
1729 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1730 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1731 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a | 1732 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
f67b4599 | 1733 | tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY); |
1ab1457c YH |
1734 | if (tp->ucopy.dma_chan) |
1735 | ret = tcp_v6_do_rcv(sk, skb); | |
1736 | else | |
1a2449a8 CL |
1737 | #endif |
1738 | { | |
1739 | if (!tcp_prequeue(sk, skb)) | |
1740 | ret = tcp_v6_do_rcv(sk, skb); | |
1741 | } | |
6cce09f8 | 1742 | } else if (unlikely(sk_add_backlog(sk, skb))) { |
6b03a53a | 1743 | bh_unlock_sock(sk); |
6cce09f8 | 1744 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1745 | goto discard_and_relse; |
1746 | } | |
1da177e4 LT |
1747 | bh_unlock_sock(sk); |
1748 | ||
1749 | sock_put(sk); | |
1750 | return ret ? -1 : 0; | |
1751 | ||
1752 | no_tcp_socket: | |
1753 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1754 | goto discard_it; | |
1755 | ||
1756 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1757 | bad_packet: | |
63231bdd | 1758 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1759 | } else { |
cfb6eeb4 | 1760 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1761 | } |
1762 | ||
1763 | discard_it: | |
1764 | ||
1765 | /* | |
1766 | * Discard frame | |
1767 | */ | |
1768 | ||
1769 | kfree_skb(skb); | |
1770 | return 0; | |
1771 | ||
1772 | discard_and_relse: | |
1773 | sock_put(sk); | |
1774 | goto discard_it; | |
1775 | ||
1776 | do_time_wait: | |
1777 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1778 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1779 | goto discard_it; |
1780 | } | |
1781 | ||
1782 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
63231bdd | 1783 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
9469c7b4 | 1784 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1785 | goto discard_it; |
1786 | } | |
1787 | ||
9469c7b4 | 1788 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1789 | case TCP_TW_SYN: |
1790 | { | |
1791 | struct sock *sk2; | |
1792 | ||
c346dca1 | 1793 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
0660e03f | 1794 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1795 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1796 | if (sk2 != NULL) { |
295ff7ed ACM |
1797 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1798 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1799 | inet_twsk_put(tw); | |
1da177e4 LT |
1800 | sk = sk2; |
1801 | goto process; | |
1802 | } | |
1803 | /* Fall through to ACK */ | |
1804 | } | |
1805 | case TCP_TW_ACK: | |
1806 | tcp_v6_timewait_ack(sk, skb); | |
1807 | break; | |
1808 | case TCP_TW_RST: | |
1809 | goto no_tcp_socket; | |
1810 | case TCP_TW_SUCCESS:; | |
1811 | } | |
1812 | goto discard_it; | |
1813 | } | |
1814 | ||
ccb7c410 DM |
1815 | static struct inet_peer *tcp_v6_get_peer(struct sock *sk, bool *release_it) |
1816 | { | |
1817 | /* Alas, not yet... */ | |
1818 | return NULL; | |
1819 | } | |
1820 | ||
1821 | static void *tcp_v6_tw_get_peer(struct sock *sk) | |
1da177e4 | 1822 | { |
ccb7c410 DM |
1823 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1824 | ||
1825 | if (tw->tw_family == AF_INET) | |
1826 | return tcp_v4_tw_get_peer(sk); | |
1827 | ||
1da177e4 | 1828 | /* Alas, not yet... */ |
3f419d2d | 1829 | return NULL; |
1da177e4 LT |
1830 | } |
1831 | ||
ccb7c410 DM |
1832 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1833 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1834 | .twsk_unique = tcp_twsk_unique, | |
1835 | .twsk_destructor= tcp_twsk_destructor, | |
1836 | .twsk_getpeer = tcp_v6_tw_get_peer, | |
1837 | }; | |
1838 | ||
3b401a81 | 1839 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1840 | .queue_xmit = inet6_csk_xmit, |
1841 | .send_check = tcp_v6_send_check, | |
1842 | .rebuild_header = inet6_sk_rebuild_header, | |
1843 | .conn_request = tcp_v6_conn_request, | |
1844 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
3f419d2d | 1845 | .get_peer = tcp_v6_get_peer, |
543d9cfe ACM |
1846 | .net_header_len = sizeof(struct ipv6hdr), |
1847 | .setsockopt = ipv6_setsockopt, | |
1848 | .getsockopt = ipv6_getsockopt, | |
1849 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1850 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1851 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1852 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1853 | .compat_setsockopt = compat_ipv6_setsockopt, |
1854 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1855 | #endif |
1da177e4 LT |
1856 | }; |
1857 | ||
cfb6eeb4 | 1858 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1859 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1860 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1861 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 YH |
1862 | .md5_add = tcp_v6_md5_add_func, |
1863 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1864 | }; |
a928630a | 1865 | #endif |
cfb6eeb4 | 1866 | |
1da177e4 LT |
1867 | /* |
1868 | * TCP over IPv4 via INET6 API | |
1869 | */ | |
1870 | ||
3b401a81 | 1871 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1872 | .queue_xmit = ip_queue_xmit, |
1873 | .send_check = tcp_v4_send_check, | |
1874 | .rebuild_header = inet_sk_rebuild_header, | |
1875 | .conn_request = tcp_v6_conn_request, | |
1876 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
3f419d2d | 1877 | .get_peer = tcp_v4_get_peer, |
543d9cfe ACM |
1878 | .net_header_len = sizeof(struct iphdr), |
1879 | .setsockopt = ipv6_setsockopt, | |
1880 | .getsockopt = ipv6_getsockopt, | |
1881 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1882 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1883 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1884 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1885 | .compat_setsockopt = compat_ipv6_setsockopt, |
1886 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1887 | #endif |
1da177e4 LT |
1888 | }; |
1889 | ||
cfb6eeb4 | 1890 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1891 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1892 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1893 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 YH |
1894 | .md5_add = tcp_v6_md5_add_func, |
1895 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1896 | }; |
a928630a | 1897 | #endif |
cfb6eeb4 | 1898 | |
1da177e4 LT |
1899 | /* NOTE: A lot of things set to zero explicitly by call to |
1900 | * sk_alloc() so need not be done here. | |
1901 | */ | |
1902 | static int tcp_v6_init_sock(struct sock *sk) | |
1903 | { | |
6687e988 | 1904 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1905 | struct tcp_sock *tp = tcp_sk(sk); |
1906 | ||
1907 | skb_queue_head_init(&tp->out_of_order_queue); | |
1908 | tcp_init_xmit_timers(sk); | |
1909 | tcp_prequeue_init(tp); | |
1910 | ||
6687e988 | 1911 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1912 | tp->mdev = TCP_TIMEOUT_INIT; |
1913 | ||
1914 | /* So many TCP implementations out there (incorrectly) count the | |
1915 | * initial SYN frame in their delayed-ACK and congestion control | |
1916 | * algorithms that we must have the following bandaid to talk | |
1917 | * efficiently to them. -DaveM | |
1918 | */ | |
1919 | tp->snd_cwnd = 2; | |
1920 | ||
1921 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1922 | * initialization of these values. | |
1923 | */ | |
0b6a05c1 | 1924 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; |
1da177e4 | 1925 | tp->snd_cwnd_clamp = ~0; |
bee7ca9e | 1926 | tp->mss_cache = TCP_MSS_DEFAULT; |
1da177e4 LT |
1927 | |
1928 | tp->reordering = sysctl_tcp_reordering; | |
1929 | ||
1930 | sk->sk_state = TCP_CLOSE; | |
1931 | ||
8292a17a | 1932 | icsk->icsk_af_ops = &ipv6_specific; |
6687e988 | 1933 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
d83d8461 | 1934 | icsk->icsk_sync_mss = tcp_sync_mss; |
1da177e4 LT |
1935 | sk->sk_write_space = sk_stream_write_space; |
1936 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1937 | ||
cfb6eeb4 YH |
1938 | #ifdef CONFIG_TCP_MD5SIG |
1939 | tp->af_specific = &tcp_sock_ipv6_specific; | |
1940 | #endif | |
1941 | ||
435cf559 WAS |
1942 | /* TCP Cookie Transactions */ |
1943 | if (sysctl_tcp_cookie_size > 0) { | |
1944 | /* Default, cookies without s_data_payload. */ | |
1945 | tp->cookie_values = | |
1946 | kzalloc(sizeof(*tp->cookie_values), | |
1947 | sk->sk_allocation); | |
1948 | if (tp->cookie_values != NULL) | |
1949 | kref_init(&tp->cookie_values->kref); | |
1950 | } | |
1951 | /* Presumed zeroed, in order of appearance: | |
1952 | * cookie_in_always, cookie_out_never, | |
1953 | * s_data_constant, s_data_in, s_data_out | |
1954 | */ | |
1da177e4 LT |
1955 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
1956 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1957 | ||
eb4dea58 | 1958 | local_bh_disable(); |
1748376b | 1959 | percpu_counter_inc(&tcp_sockets_allocated); |
eb4dea58 | 1960 | local_bh_enable(); |
1da177e4 LT |
1961 | |
1962 | return 0; | |
1963 | } | |
1964 | ||
7d06b2e0 | 1965 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1966 | { |
cfb6eeb4 YH |
1967 | #ifdef CONFIG_TCP_MD5SIG |
1968 | /* Clean up the MD5 key list */ | |
1969 | if (tcp_sk(sk)->md5sig_info) | |
1970 | tcp_v6_clear_md5_list(sk); | |
1971 | #endif | |
1da177e4 | 1972 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1973 | inet6_destroy_sock(sk); |
1da177e4 LT |
1974 | } |
1975 | ||
952a10be | 1976 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1977 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1978 | static void get_openreq6(struct seq_file *seq, |
60236fdd | 1979 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 1980 | { |
1da177e4 | 1981 | int ttd = req->expires - jiffies; |
ca304b61 ACM |
1982 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1983 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1984 | |
1985 | if (ttd < 0) | |
1986 | ttd = 0; | |
1987 | ||
1da177e4 LT |
1988 | seq_printf(seq, |
1989 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1990 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1991 | i, | |
1992 | src->s6_addr32[0], src->s6_addr32[1], | |
1993 | src->s6_addr32[2], src->s6_addr32[3], | |
fd507037 | 1994 | ntohs(inet_rsk(req)->loc_port), |
1da177e4 LT |
1995 | dest->s6_addr32[0], dest->s6_addr32[1], |
1996 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1997 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1998 | TCP_SYN_RECV, |
1999 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
2000 | 1, /* timers active (only the expire timer) */ |
2001 | jiffies_to_clock_t(ttd), | |
1da177e4 LT |
2002 | req->retrans, |
2003 | uid, | |
1ab1457c | 2004 | 0, /* non standard timer */ |
1da177e4 LT |
2005 | 0, /* open_requests have no inode */ |
2006 | 0, req); | |
2007 | } | |
2008 | ||
2009 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
2010 | { | |
2011 | struct in6_addr *dest, *src; | |
2012 | __u16 destp, srcp; | |
2013 | int timer_active; | |
2014 | unsigned long timer_expires; | |
2015 | struct inet_sock *inet = inet_sk(sp); | |
2016 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 2017 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
2018 | struct ipv6_pinfo *np = inet6_sk(sp); |
2019 | ||
2020 | dest = &np->daddr; | |
2021 | src = &np->rcv_saddr; | |
c720c7e8 ED |
2022 | destp = ntohs(inet->inet_dport); |
2023 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
2024 | |
2025 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 2026 | timer_active = 1; |
463c84b9 ACM |
2027 | timer_expires = icsk->icsk_timeout; |
2028 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 2029 | timer_active = 4; |
463c84b9 | 2030 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
2031 | } else if (timer_pending(&sp->sk_timer)) { |
2032 | timer_active = 2; | |
2033 | timer_expires = sp->sk_timer.expires; | |
2034 | } else { | |
2035 | timer_active = 0; | |
2036 | timer_expires = jiffies; | |
2037 | } | |
2038 | ||
2039 | seq_printf(seq, | |
2040 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
7be87351 | 2041 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n", |
1da177e4 LT |
2042 | i, |
2043 | src->s6_addr32[0], src->s6_addr32[1], | |
2044 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2045 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2046 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 2047 | sp->sk_state, |
47da8ee6 SS |
2048 | tp->write_seq-tp->snd_una, |
2049 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 LT |
2050 | timer_active, |
2051 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 2052 | icsk->icsk_retransmits, |
1da177e4 | 2053 | sock_i_uid(sp), |
6687e988 | 2054 | icsk->icsk_probes_out, |
1da177e4 LT |
2055 | sock_i_ino(sp), |
2056 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
2057 | jiffies_to_clock_t(icsk->icsk_rto), |
2058 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 2059 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
0b6a05c1 IJ |
2060 | tp->snd_cwnd, |
2061 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh | |
1da177e4 LT |
2062 | ); |
2063 | } | |
2064 | ||
1ab1457c | 2065 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 2066 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
2067 | { |
2068 | struct in6_addr *dest, *src; | |
2069 | __u16 destp, srcp; | |
0fa1a53e | 2070 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
2071 | int ttd = tw->tw_ttd - jiffies; |
2072 | ||
2073 | if (ttd < 0) | |
2074 | ttd = 0; | |
2075 | ||
0fa1a53e ACM |
2076 | dest = &tw6->tw_v6_daddr; |
2077 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
2078 | destp = ntohs(tw->tw_dport); |
2079 | srcp = ntohs(tw->tw_sport); | |
2080 | ||
2081 | seq_printf(seq, | |
2082 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2083 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
2084 | i, | |
2085 | src->s6_addr32[0], src->s6_addr32[1], | |
2086 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2087 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2088 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2089 | tw->tw_substate, 0, 0, | |
2090 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2091 | atomic_read(&tw->tw_refcnt), tw); | |
2092 | } | |
2093 | ||
1da177e4 LT |
2094 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
2095 | { | |
2096 | struct tcp_iter_state *st; | |
2097 | ||
2098 | if (v == SEQ_START_TOKEN) { | |
2099 | seq_puts(seq, | |
2100 | " sl " | |
2101 | "local_address " | |
2102 | "remote_address " | |
2103 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2104 | " uid timeout inode\n"); | |
2105 | goto out; | |
2106 | } | |
2107 | st = seq->private; | |
2108 | ||
2109 | switch (st->state) { | |
2110 | case TCP_SEQ_STATE_LISTENING: | |
2111 | case TCP_SEQ_STATE_ESTABLISHED: | |
2112 | get_tcp6_sock(seq, v, st->num); | |
2113 | break; | |
2114 | case TCP_SEQ_STATE_OPENREQ: | |
2115 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
2116 | break; | |
2117 | case TCP_SEQ_STATE_TIME_WAIT: | |
2118 | get_timewait6_sock(seq, v, st->num); | |
2119 | break; | |
2120 | } | |
2121 | out: | |
2122 | return 0; | |
2123 | } | |
2124 | ||
1da177e4 | 2125 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
2126 | .name = "tcp6", |
2127 | .family = AF_INET6, | |
5f4472c5 DL |
2128 | .seq_fops = { |
2129 | .owner = THIS_MODULE, | |
2130 | }, | |
9427c4b3 DL |
2131 | .seq_ops = { |
2132 | .show = tcp6_seq_show, | |
2133 | }, | |
1da177e4 LT |
2134 | }; |
2135 | ||
2c8c1e72 | 2136 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 2137 | { |
6f8b13bc | 2138 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2139 | } |
2140 | ||
6f8b13bc | 2141 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2142 | { |
6f8b13bc | 2143 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2144 | } |
2145 | #endif | |
2146 | ||
2147 | struct proto tcpv6_prot = { | |
2148 | .name = "TCPv6", | |
2149 | .owner = THIS_MODULE, | |
2150 | .close = tcp_close, | |
2151 | .connect = tcp_v6_connect, | |
2152 | .disconnect = tcp_disconnect, | |
463c84b9 | 2153 | .accept = inet_csk_accept, |
1da177e4 LT |
2154 | .ioctl = tcp_ioctl, |
2155 | .init = tcp_v6_init_sock, | |
2156 | .destroy = tcp_v6_destroy_sock, | |
2157 | .shutdown = tcp_shutdown, | |
2158 | .setsockopt = tcp_setsockopt, | |
2159 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 2160 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
2161 | .sendmsg = tcp_sendmsg, |
2162 | .sendpage = tcp_sendpage, | |
1da177e4 LT |
2163 | .backlog_rcv = tcp_v6_do_rcv, |
2164 | .hash = tcp_v6_hash, | |
ab1e0a13 ACM |
2165 | .unhash = inet_unhash, |
2166 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2167 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2168 | .sockets_allocated = &tcp_sockets_allocated, | |
2169 | .memory_allocated = &tcp_memory_allocated, | |
2170 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2171 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2172 | .sysctl_mem = sysctl_tcp_mem, |
2173 | .sysctl_wmem = sysctl_tcp_wmem, | |
2174 | .sysctl_rmem = sysctl_tcp_rmem, | |
2175 | .max_header = MAX_TCP_HEADER, | |
2176 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 2177 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 2178 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2179 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2180 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 2181 | .no_autobind = true, |
543d9cfe ACM |
2182 | #ifdef CONFIG_COMPAT |
2183 | .compat_setsockopt = compat_tcp_setsockopt, | |
2184 | .compat_getsockopt = compat_tcp_getsockopt, | |
2185 | #endif | |
1da177e4 LT |
2186 | }; |
2187 | ||
41135cc8 | 2188 | static const struct inet6_protocol tcpv6_protocol = { |
1da177e4 LT |
2189 | .handler = tcp_v6_rcv, |
2190 | .err_handler = tcp_v6_err, | |
a430a43d | 2191 | .gso_send_check = tcp_v6_gso_send_check, |
adcfc7d0 | 2192 | .gso_segment = tcp_tso_segment, |
684f2176 HX |
2193 | .gro_receive = tcp6_gro_receive, |
2194 | .gro_complete = tcp6_gro_complete, | |
1da177e4 LT |
2195 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
2196 | }; | |
2197 | ||
1da177e4 LT |
2198 | static struct inet_protosw tcpv6_protosw = { |
2199 | .type = SOCK_STREAM, | |
2200 | .protocol = IPPROTO_TCP, | |
2201 | .prot = &tcpv6_prot, | |
2202 | .ops = &inet6_stream_ops, | |
1da177e4 | 2203 | .no_check = 0, |
d83d8461 ACM |
2204 | .flags = INET_PROTOSW_PERMANENT | |
2205 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2206 | }; |
2207 | ||
2c8c1e72 | 2208 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 2209 | { |
5677242f DL |
2210 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2211 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2212 | } |
2213 | ||
2c8c1e72 | 2214 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 2215 | { |
5677242f | 2216 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
2217 | } |
2218 | ||
2c8c1e72 | 2219 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
2220 | { |
2221 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
2222 | } |
2223 | ||
2224 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
2225 | .init = tcpv6_net_init, |
2226 | .exit = tcpv6_net_exit, | |
2227 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
2228 | }; |
2229 | ||
7f4e4868 | 2230 | int __init tcpv6_init(void) |
1da177e4 | 2231 | { |
7f4e4868 DL |
2232 | int ret; |
2233 | ||
2234 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2235 | if (ret) | |
2236 | goto out; | |
2237 | ||
1da177e4 | 2238 | /* register inet6 protocol */ |
7f4e4868 DL |
2239 | ret = inet6_register_protosw(&tcpv6_protosw); |
2240 | if (ret) | |
2241 | goto out_tcpv6_protocol; | |
2242 | ||
93ec926b | 2243 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2244 | if (ret) |
2245 | goto out_tcpv6_protosw; | |
2246 | out: | |
2247 | return ret; | |
ae0f7d5f | 2248 | |
7f4e4868 DL |
2249 | out_tcpv6_protocol: |
2250 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2251 | out_tcpv6_protosw: | |
2252 | inet6_unregister_protosw(&tcpv6_protosw); | |
2253 | goto out; | |
2254 | } | |
2255 | ||
09f7709f | 2256 | void tcpv6_exit(void) |
7f4e4868 | 2257 | { |
93ec926b | 2258 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2259 | inet6_unregister_protosw(&tcpv6_protosw); |
2260 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2261 | } |