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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; |
493f377d | 133 | struct rt6_info *rt; |
1da177e4 LT |
134 | struct flowi fl; |
135 | struct dst_entry *dst; | |
136 | int addr_type; | |
137 | int err; | |
138 | ||
1ab1457c | 139 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
140 | return -EINVAL; |
141 | ||
1ab1457c | 142 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 143 | return -EAFNOSUPPORT; |
1da177e4 LT |
144 | |
145 | memset(&fl, 0, sizeof(fl)); | |
146 | ||
147 | if (np->sndflow) { | |
148 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
149 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
150 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
151 | struct ip6_flowlabel *flowlabel; | |
152 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
153 | if (flowlabel == NULL) | |
154 | return -EINVAL; | |
155 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
156 | fl6_sock_release(flowlabel); | |
157 | } | |
158 | } | |
159 | ||
160 | /* | |
1ab1457c YH |
161 | * connect() to INADDR_ANY means loopback (BSD'ism). |
162 | */ | |
163 | ||
164 | if(ipv6_addr_any(&usin->sin6_addr)) | |
165 | usin->sin6_addr.s6_addr[15] = 0x1; | |
1da177e4 LT |
166 | |
167 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
168 | ||
169 | if(addr_type & IPV6_ADDR_MULTICAST) | |
170 | return -ENETUNREACH; | |
171 | ||
172 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
173 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
174 | usin->sin6_scope_id) { | |
175 | /* If interface is set while binding, indices | |
176 | * must coincide. | |
177 | */ | |
178 | if (sk->sk_bound_dev_if && | |
179 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
180 | return -EINVAL; | |
181 | ||
182 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
183 | } | |
184 | ||
185 | /* Connect to link-local address requires an interface */ | |
186 | if (!sk->sk_bound_dev_if) | |
187 | return -EINVAL; | |
188 | } | |
189 | ||
190 | if (tp->rx_opt.ts_recent_stamp && | |
191 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
192 | tp->rx_opt.ts_recent = 0; | |
193 | tp->rx_opt.ts_recent_stamp = 0; | |
194 | tp->write_seq = 0; | |
195 | } | |
196 | ||
197 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
198 | np->flow_label = fl.fl6_flowlabel; | |
199 | ||
200 | /* | |
201 | * TCP over IPv4 | |
202 | */ | |
203 | ||
204 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 205 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
206 | struct sockaddr_in sin; |
207 | ||
208 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
209 | ||
210 | if (__ipv6_only_sock(sk)) | |
211 | return -ENETUNREACH; | |
212 | ||
213 | sin.sin_family = AF_INET; | |
214 | sin.sin_port = usin->sin6_port; | |
215 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
216 | ||
d83d8461 | 217 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 218 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
219 | #ifdef CONFIG_TCP_MD5SIG |
220 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
221 | #endif | |
1da177e4 LT |
222 | |
223 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
224 | ||
225 | if (err) { | |
d83d8461 ACM |
226 | icsk->icsk_ext_hdr_len = exthdrlen; |
227 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 228 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
229 | #ifdef CONFIG_TCP_MD5SIG |
230 | tp->af_specific = &tcp_sock_ipv6_specific; | |
231 | #endif | |
1da177e4 LT |
232 | goto failure; |
233 | } else { | |
c720c7e8 ED |
234 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
235 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, | |
236 | &np->rcv_saddr); | |
1da177e4 LT |
237 | } |
238 | ||
239 | return err; | |
240 | } | |
241 | ||
242 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
243 | saddr = &np->rcv_saddr; | |
244 | ||
1d28f42c | 245 | fl.flowi_proto = IPPROTO_TCP; |
1da177e4 LT |
246 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
247 | ipv6_addr_copy(&fl.fl6_src, | |
248 | (saddr ? saddr : &np->saddr)); | |
1d28f42c DM |
249 | fl.flowi_oif = sk->sk_bound_dev_if; |
250 | fl.flowi_mark = sk->sk_mark; | |
1da177e4 | 251 | fl.fl_ip_dport = usin->sin6_port; |
c720c7e8 | 252 | fl.fl_ip_sport = inet->inet_sport; |
1da177e4 | 253 | |
20c59de2 | 254 | final_p = fl6_update_dst(&fl, np->opt, &final); |
1da177e4 | 255 | |
beb8d13b VY |
256 | security_sk_classify_flow(sk, &fl); |
257 | ||
68d0c6d3 DM |
258 | dst = ip6_dst_lookup_flow(sk, &fl, final_p, true); |
259 | if (IS_ERR(dst)) { | |
260 | err = PTR_ERR(dst); | |
1da177e4 | 261 | goto failure; |
14e50e57 | 262 | } |
1da177e4 LT |
263 | |
264 | if (saddr == NULL) { | |
265 | saddr = &fl.fl6_src; | |
266 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
267 | } | |
268 | ||
269 | /* set the source address */ | |
270 | ipv6_addr_copy(&np->saddr, saddr); | |
c720c7e8 | 271 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 272 | |
f83ef8c0 | 273 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 274 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 275 | |
493f377d DM |
276 | rt = (struct rt6_info *) dst; |
277 | if (tcp_death_row.sysctl_tw_recycle && | |
278 | !tp->rx_opt.ts_recent_stamp && | |
279 | ipv6_addr_equal(&rt->rt6i_dst.addr, &np->daddr)) { | |
280 | struct inet_peer *peer = rt6_get_peer(rt); | |
281 | /* | |
282 | * VJ's idea. We save last timestamp seen from | |
283 | * the destination in peer table, when entering state | |
284 | * TIME-WAIT * and initialize rx_opt.ts_recent from it, | |
285 | * when trying new connection. | |
286 | */ | |
287 | if (peer) { | |
288 | inet_peer_refcheck(peer); | |
289 | if ((u32)get_seconds() - peer->tcp_ts_stamp <= TCP_PAWS_MSL) { | |
290 | tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp; | |
291 | tp->rx_opt.ts_recent = peer->tcp_ts; | |
292 | } | |
293 | } | |
294 | } | |
295 | ||
d83d8461 | 296 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 297 | if (np->opt) |
d83d8461 ACM |
298 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
299 | np->opt->opt_nflen); | |
1da177e4 LT |
300 | |
301 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
302 | ||
c720c7e8 | 303 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
304 | |
305 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 306 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
307 | if (err) |
308 | goto late_failure; | |
309 | ||
310 | if (!tp->write_seq) | |
311 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
312 | np->daddr.s6_addr32, | |
c720c7e8 ED |
313 | inet->inet_sport, |
314 | inet->inet_dport); | |
1da177e4 LT |
315 | |
316 | err = tcp_connect(sk); | |
317 | if (err) | |
318 | goto late_failure; | |
319 | ||
320 | return 0; | |
321 | ||
322 | late_failure: | |
323 | tcp_set_state(sk, TCP_CLOSE); | |
324 | __sk_dst_reset(sk); | |
325 | failure: | |
c720c7e8 | 326 | inet->inet_dport = 0; |
1da177e4 LT |
327 | sk->sk_route_caps = 0; |
328 | return err; | |
329 | } | |
330 | ||
331 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 332 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 LT |
333 | { |
334 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
505cbfc5 | 335 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
336 | struct ipv6_pinfo *np; |
337 | struct sock *sk; | |
338 | int err; | |
1ab1457c | 339 | struct tcp_sock *tp; |
1da177e4 | 340 | __u32 seq; |
ca12a1a4 | 341 | struct net *net = dev_net(skb->dev); |
1da177e4 | 342 | |
ca12a1a4 | 343 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 344 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
345 | |
346 | if (sk == NULL) { | |
e41b5368 DL |
347 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
348 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
349 | return; |
350 | } | |
351 | ||
352 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 353 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
354 | return; |
355 | } | |
356 | ||
357 | bh_lock_sock(sk); | |
358 | if (sock_owned_by_user(sk)) | |
de0744af | 359 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
360 | |
361 | if (sk->sk_state == TCP_CLOSE) | |
362 | goto out; | |
363 | ||
e802af9c SH |
364 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
365 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
366 | goto out; | |
367 | } | |
368 | ||
1da177e4 | 369 | tp = tcp_sk(sk); |
1ab1457c | 370 | seq = ntohl(th->seq); |
1da177e4 LT |
371 | if (sk->sk_state != TCP_LISTEN && |
372 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
de0744af | 373 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
374 | goto out; |
375 | } | |
376 | ||
377 | np = inet6_sk(sk); | |
378 | ||
379 | if (type == ICMPV6_PKT_TOOBIG) { | |
68d0c6d3 | 380 | struct dst_entry *dst; |
1da177e4 LT |
381 | |
382 | if (sock_owned_by_user(sk)) | |
383 | goto out; | |
384 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
385 | goto out; | |
386 | ||
387 | /* icmp should have updated the destination cache entry */ | |
388 | dst = __sk_dst_check(sk, np->dst_cookie); | |
389 | ||
390 | if (dst == NULL) { | |
391 | struct inet_sock *inet = inet_sk(sk); | |
392 | struct flowi fl; | |
393 | ||
394 | /* BUGGG_FUTURE: Again, it is not clear how | |
395 | to handle rthdr case. Ignore this complexity | |
396 | for now. | |
397 | */ | |
398 | memset(&fl, 0, sizeof(fl)); | |
1d28f42c | 399 | fl.flowi_proto = IPPROTO_TCP; |
1da177e4 LT |
400 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
401 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
1d28f42c DM |
402 | fl.flowi_oif = sk->sk_bound_dev_if; |
403 | fl.flowi_mark = sk->sk_mark; | |
c720c7e8 ED |
404 | fl.fl_ip_dport = inet->inet_dport; |
405 | fl.fl_ip_sport = inet->inet_sport; | |
beb8d13b | 406 | security_skb_classify_flow(skb, &fl); |
1da177e4 | 407 | |
68d0c6d3 DM |
408 | dst = ip6_dst_lookup_flow(sk, &fl, NULL, false); |
409 | if (IS_ERR(dst)) { | |
410 | sk->sk_err_soft = -PTR_ERR(dst); | |
1da177e4 LT |
411 | goto out; |
412 | } | |
413 | ||
414 | } else | |
415 | dst_hold(dst); | |
416 | ||
d83d8461 | 417 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
1da177e4 LT |
418 | tcp_sync_mss(sk, dst_mtu(dst)); |
419 | tcp_simple_retransmit(sk); | |
420 | } /* else let the usual retransmit timer handle it */ | |
421 | dst_release(dst); | |
422 | goto out; | |
423 | } | |
424 | ||
425 | icmpv6_err_convert(type, code, &err); | |
426 | ||
60236fdd | 427 | /* Might be for an request_sock */ |
1da177e4 | 428 | switch (sk->sk_state) { |
60236fdd | 429 | struct request_sock *req, **prev; |
1da177e4 LT |
430 | case TCP_LISTEN: |
431 | if (sock_owned_by_user(sk)) | |
432 | goto out; | |
433 | ||
8129765a ACM |
434 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
435 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
436 | if (!req) |
437 | goto out; | |
438 | ||
439 | /* ICMPs are not backlogged, hence we cannot get | |
440 | * an established socket here. | |
441 | */ | |
547b792c | 442 | WARN_ON(req->sk != NULL); |
1da177e4 | 443 | |
2e6599cb | 444 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 445 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
446 | goto out; |
447 | } | |
448 | ||
463c84b9 | 449 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
450 | goto out; |
451 | ||
452 | case TCP_SYN_SENT: | |
453 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 454 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 455 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
456 | sk->sk_err = err; |
457 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
458 | ||
459 | tcp_done(sk); | |
460 | } else | |
461 | sk->sk_err_soft = err; | |
462 | goto out; | |
463 | } | |
464 | ||
465 | if (!sock_owned_by_user(sk) && np->recverr) { | |
466 | sk->sk_err = err; | |
467 | sk->sk_error_report(sk); | |
468 | } else | |
469 | sk->sk_err_soft = err; | |
470 | ||
471 | out: | |
472 | bh_unlock_sock(sk); | |
473 | sock_put(sk); | |
474 | } | |
475 | ||
476 | ||
e6b4d113 WAS |
477 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, |
478 | struct request_values *rvp) | |
1da177e4 | 479 | { |
ca304b61 | 480 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
481 | struct ipv6_pinfo *np = inet6_sk(sk); |
482 | struct sk_buff * skb; | |
483 | struct ipv6_txoptions *opt = NULL; | |
20c59de2 | 484 | struct in6_addr * final_p, final; |
1da177e4 | 485 | struct flowi fl; |
fd80eb94 | 486 | struct dst_entry *dst; |
68d0c6d3 | 487 | int err; |
1da177e4 LT |
488 | |
489 | memset(&fl, 0, sizeof(fl)); | |
1d28f42c | 490 | fl.flowi_proto = IPPROTO_TCP; |
2e6599cb ACM |
491 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
492 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 493 | fl.fl6_flowlabel = 0; |
1d28f42c DM |
494 | fl.flowi_oif = treq->iif; |
495 | fl.flowi_mark = sk->sk_mark; | |
2e6599cb | 496 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
fd507037 | 497 | fl.fl_ip_sport = inet_rsk(req)->loc_port; |
4237c75c | 498 | security_req_classify_flow(req, &fl); |
1da177e4 | 499 | |
fd80eb94 | 500 | opt = np->opt; |
20c59de2 | 501 | final_p = fl6_update_dst(&fl, opt, &final); |
1da177e4 | 502 | |
68d0c6d3 DM |
503 | dst = ip6_dst_lookup_flow(sk, &fl, final_p, false); |
504 | if (IS_ERR(dst)) { | |
505 | err = PTR_ERR(dst); | |
fd80eb94 | 506 | goto done; |
68d0c6d3 | 507 | } |
e6b4d113 | 508 | skb = tcp_make_synack(sk, dst, req, rvp); |
68d0c6d3 | 509 | err = -ENOMEM; |
1da177e4 | 510 | if (skb) { |
8ad50d96 | 511 | __tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr); |
1da177e4 | 512 | |
2e6599cb | 513 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
4e15ed4d | 514 | err = ip6_xmit(sk, skb, &fl, opt); |
b9df3cb8 | 515 | err = net_xmit_eval(err); |
1da177e4 LT |
516 | } |
517 | ||
518 | done: | |
1ab1457c | 519 | if (opt && opt != np->opt) |
1da177e4 | 520 | sock_kfree_s(sk, opt, opt->tot_len); |
78b91042 | 521 | dst_release(dst); |
1da177e4 LT |
522 | return err; |
523 | } | |
524 | ||
72659ecc OP |
525 | static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req, |
526 | struct request_values *rvp) | |
527 | { | |
528 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); | |
529 | return tcp_v6_send_synack(sk, req, rvp); | |
530 | } | |
531 | ||
c6aefafb GG |
532 | static inline void syn_flood_warning(struct sk_buff *skb) |
533 | { | |
534 | #ifdef CONFIG_SYN_COOKIES | |
535 | if (sysctl_tcp_syncookies) | |
536 | printk(KERN_INFO | |
537 | "TCPv6: Possible SYN flooding on port %d. " | |
538 | "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest)); | |
539 | else | |
540 | #endif | |
541 | printk(KERN_INFO | |
542 | "TCPv6: Possible SYN flooding on port %d. " | |
543 | "Dropping request.\n", ntohs(tcp_hdr(skb)->dest)); | |
544 | } | |
545 | ||
60236fdd | 546 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 547 | { |
800d55f1 | 548 | kfree_skb(inet6_rsk(req)->pktopts); |
1da177e4 LT |
549 | } |
550 | ||
cfb6eeb4 YH |
551 | #ifdef CONFIG_TCP_MD5SIG |
552 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
553 | struct in6_addr *addr) | |
554 | { | |
555 | struct tcp_sock *tp = tcp_sk(sk); | |
556 | int i; | |
557 | ||
558 | BUG_ON(tp == NULL); | |
559 | ||
560 | if (!tp->md5sig_info || !tp->md5sig_info->entries6) | |
561 | return NULL; | |
562 | ||
563 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 564 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr)) |
f8ab18d2 | 565 | return &tp->md5sig_info->keys6[i].base; |
cfb6eeb4 YH |
566 | } |
567 | return NULL; | |
568 | } | |
569 | ||
570 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
571 | struct sock *addr_sk) | |
572 | { | |
573 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); | |
574 | } | |
575 | ||
576 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
577 | struct request_sock *req) | |
578 | { | |
579 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
580 | } | |
581 | ||
582 | static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer, | |
583 | char *newkey, u8 newkeylen) | |
584 | { | |
585 | /* Add key to the list */ | |
b0a713e9 | 586 | struct tcp_md5sig_key *key; |
cfb6eeb4 YH |
587 | struct tcp_sock *tp = tcp_sk(sk); |
588 | struct tcp6_md5sig_key *keys; | |
589 | ||
b0a713e9 | 590 | key = tcp_v6_md5_do_lookup(sk, peer); |
cfb6eeb4 YH |
591 | if (key) { |
592 | /* modify existing entry - just update that one */ | |
b0a713e9 MD |
593 | kfree(key->key); |
594 | key->key = newkey; | |
595 | key->keylen = newkeylen; | |
cfb6eeb4 YH |
596 | } else { |
597 | /* reallocate new list if current one is full. */ | |
598 | if (!tp->md5sig_info) { | |
599 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC); | |
600 | if (!tp->md5sig_info) { | |
601 | kfree(newkey); | |
602 | return -ENOMEM; | |
603 | } | |
a465419b | 604 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
cfb6eeb4 | 605 | } |
aa133076 | 606 | if (tcp_alloc_md5sig_pool(sk) == NULL) { |
aacbe8c8 YH |
607 | kfree(newkey); |
608 | return -ENOMEM; | |
609 | } | |
cfb6eeb4 YH |
610 | if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) { |
611 | keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) * | |
612 | (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC); | |
613 | ||
614 | if (!keys) { | |
615 | tcp_free_md5sig_pool(); | |
616 | kfree(newkey); | |
617 | return -ENOMEM; | |
618 | } | |
619 | ||
620 | if (tp->md5sig_info->entries6) | |
621 | memmove(keys, tp->md5sig_info->keys6, | |
622 | (sizeof (tp->md5sig_info->keys6[0]) * | |
623 | tp->md5sig_info->entries6)); | |
624 | ||
625 | kfree(tp->md5sig_info->keys6); | |
626 | tp->md5sig_info->keys6 = keys; | |
627 | tp->md5sig_info->alloced6++; | |
628 | } | |
629 | ||
630 | ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr, | |
631 | peer); | |
f8ab18d2 DM |
632 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey; |
633 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen; | |
cfb6eeb4 YH |
634 | |
635 | tp->md5sig_info->entries6++; | |
636 | } | |
637 | return 0; | |
638 | } | |
639 | ||
640 | static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk, | |
641 | u8 *newkey, __u8 newkeylen) | |
642 | { | |
643 | return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr, | |
644 | newkey, newkeylen); | |
645 | } | |
646 | ||
647 | static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer) | |
648 | { | |
649 | struct tcp_sock *tp = tcp_sk(sk); | |
650 | int i; | |
651 | ||
652 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 653 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) { |
cfb6eeb4 | 654 | /* Free the key */ |
f8ab18d2 | 655 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
656 | tp->md5sig_info->entries6--; |
657 | ||
658 | if (tp->md5sig_info->entries6 == 0) { | |
659 | kfree(tp->md5sig_info->keys6); | |
660 | tp->md5sig_info->keys6 = NULL; | |
ca983cef | 661 | tp->md5sig_info->alloced6 = 0; |
cfb6eeb4 YH |
662 | } else { |
663 | /* shrink the database */ | |
664 | if (tp->md5sig_info->entries6 != i) | |
665 | memmove(&tp->md5sig_info->keys6[i], | |
666 | &tp->md5sig_info->keys6[i+1], | |
667 | (tp->md5sig_info->entries6 - i) | |
668 | * sizeof (tp->md5sig_info->keys6[0])); | |
669 | } | |
77adefdc YH |
670 | tcp_free_md5sig_pool(); |
671 | return 0; | |
cfb6eeb4 YH |
672 | } |
673 | } | |
674 | return -ENOENT; | |
675 | } | |
676 | ||
677 | static void tcp_v6_clear_md5_list (struct sock *sk) | |
678 | { | |
679 | struct tcp_sock *tp = tcp_sk(sk); | |
680 | int i; | |
681 | ||
682 | if (tp->md5sig_info->entries6) { | |
683 | for (i = 0; i < tp->md5sig_info->entries6; i++) | |
f8ab18d2 | 684 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
685 | tp->md5sig_info->entries6 = 0; |
686 | tcp_free_md5sig_pool(); | |
687 | } | |
688 | ||
689 | kfree(tp->md5sig_info->keys6); | |
690 | tp->md5sig_info->keys6 = NULL; | |
691 | tp->md5sig_info->alloced6 = 0; | |
692 | ||
693 | if (tp->md5sig_info->entries4) { | |
694 | for (i = 0; i < tp->md5sig_info->entries4; i++) | |
f8ab18d2 | 695 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
696 | tp->md5sig_info->entries4 = 0; |
697 | tcp_free_md5sig_pool(); | |
698 | } | |
699 | ||
700 | kfree(tp->md5sig_info->keys4); | |
701 | tp->md5sig_info->keys4 = NULL; | |
702 | tp->md5sig_info->alloced4 = 0; | |
703 | } | |
704 | ||
705 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, | |
706 | int optlen) | |
707 | { | |
708 | struct tcp_md5sig cmd; | |
709 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
710 | u8 *newkey; | |
711 | ||
712 | if (optlen < sizeof(cmd)) | |
713 | return -EINVAL; | |
714 | ||
715 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
716 | return -EFAULT; | |
717 | ||
718 | if (sin6->sin6_family != AF_INET6) | |
719 | return -EINVAL; | |
720 | ||
721 | if (!cmd.tcpm_keylen) { | |
722 | if (!tcp_sk(sk)->md5sig_info) | |
723 | return -ENOENT; | |
e773e4fa | 724 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
cfb6eeb4 YH |
725 | return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]); |
726 | return tcp_v6_md5_do_del(sk, &sin6->sin6_addr); | |
727 | } | |
728 | ||
729 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
730 | return -EINVAL; | |
731 | ||
732 | if (!tcp_sk(sk)->md5sig_info) { | |
733 | struct tcp_sock *tp = tcp_sk(sk); | |
734 | struct tcp_md5sig_info *p; | |
735 | ||
736 | p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL); | |
737 | if (!p) | |
738 | return -ENOMEM; | |
739 | ||
740 | tp->md5sig_info = p; | |
a465419b | 741 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
cfb6eeb4 YH |
742 | } |
743 | ||
af879cc7 | 744 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
745 | if (!newkey) |
746 | return -ENOMEM; | |
e773e4fa | 747 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { |
cfb6eeb4 YH |
748 | return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3], |
749 | newkey, cmd.tcpm_keylen); | |
750 | } | |
751 | return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen); | |
752 | } | |
753 | ||
49a72dfb AL |
754 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
755 | struct in6_addr *daddr, | |
756 | struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 757 | { |
cfb6eeb4 | 758 | struct tcp6_pseudohdr *bp; |
49a72dfb | 759 | struct scatterlist sg; |
8d26d76d | 760 | |
cfb6eeb4 | 761 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 YH |
762 | /* 1. TCP pseudo-header (RFC2460) */ |
763 | ipv6_addr_copy(&bp->saddr, saddr); | |
764 | ipv6_addr_copy(&bp->daddr, daddr); | |
49a72dfb | 765 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 766 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 767 | |
49a72dfb AL |
768 | sg_init_one(&sg, bp, sizeof(*bp)); |
769 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
770 | } | |
c7da57a1 | 771 | |
49a72dfb AL |
772 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
773 | struct in6_addr *daddr, struct in6_addr *saddr, | |
774 | struct tcphdr *th) | |
775 | { | |
776 | struct tcp_md5sig_pool *hp; | |
777 | struct hash_desc *desc; | |
778 | ||
779 | hp = tcp_get_md5sig_pool(); | |
780 | if (!hp) | |
781 | goto clear_hash_noput; | |
782 | desc = &hp->md5_desc; | |
783 | ||
784 | if (crypto_hash_init(desc)) | |
785 | goto clear_hash; | |
786 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
787 | goto clear_hash; | |
788 | if (tcp_md5_hash_header(hp, th)) | |
789 | goto clear_hash; | |
790 | if (tcp_md5_hash_key(hp, key)) | |
791 | goto clear_hash; | |
792 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 793 | goto clear_hash; |
cfb6eeb4 | 794 | |
cfb6eeb4 | 795 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 796 | return 0; |
49a72dfb | 797 | |
cfb6eeb4 YH |
798 | clear_hash: |
799 | tcp_put_md5sig_pool(); | |
800 | clear_hash_noput: | |
801 | memset(md5_hash, 0, 16); | |
49a72dfb | 802 | return 1; |
cfb6eeb4 YH |
803 | } |
804 | ||
49a72dfb AL |
805 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
806 | struct sock *sk, struct request_sock *req, | |
807 | struct sk_buff *skb) | |
cfb6eeb4 YH |
808 | { |
809 | struct in6_addr *saddr, *daddr; | |
49a72dfb AL |
810 | struct tcp_md5sig_pool *hp; |
811 | struct hash_desc *desc; | |
812 | struct tcphdr *th = tcp_hdr(skb); | |
cfb6eeb4 YH |
813 | |
814 | if (sk) { | |
815 | saddr = &inet6_sk(sk)->saddr; | |
816 | daddr = &inet6_sk(sk)->daddr; | |
49a72dfb | 817 | } else if (req) { |
cfb6eeb4 YH |
818 | saddr = &inet6_rsk(req)->loc_addr; |
819 | daddr = &inet6_rsk(req)->rmt_addr; | |
49a72dfb AL |
820 | } else { |
821 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
822 | saddr = &ip6h->saddr; | |
823 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 824 | } |
49a72dfb AL |
825 | |
826 | hp = tcp_get_md5sig_pool(); | |
827 | if (!hp) | |
828 | goto clear_hash_noput; | |
829 | desc = &hp->md5_desc; | |
830 | ||
831 | if (crypto_hash_init(desc)) | |
832 | goto clear_hash; | |
833 | ||
834 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
835 | goto clear_hash; | |
836 | if (tcp_md5_hash_header(hp, th)) | |
837 | goto clear_hash; | |
838 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
839 | goto clear_hash; | |
840 | if (tcp_md5_hash_key(hp, key)) | |
841 | goto clear_hash; | |
842 | if (crypto_hash_final(desc, md5_hash)) | |
843 | goto clear_hash; | |
844 | ||
845 | tcp_put_md5sig_pool(); | |
846 | return 0; | |
847 | ||
848 | clear_hash: | |
849 | tcp_put_md5sig_pool(); | |
850 | clear_hash_noput: | |
851 | memset(md5_hash, 0, 16); | |
852 | return 1; | |
cfb6eeb4 YH |
853 | } |
854 | ||
855 | static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb) | |
856 | { | |
857 | __u8 *hash_location = NULL; | |
858 | struct tcp_md5sig_key *hash_expected; | |
0660e03f | 859 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
aa8223c7 | 860 | struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 861 | int genhash; |
cfb6eeb4 YH |
862 | u8 newhash[16]; |
863 | ||
864 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 865 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 866 | |
785957d3 DM |
867 | /* We've parsed the options - do we have a hash? */ |
868 | if (!hash_expected && !hash_location) | |
869 | return 0; | |
870 | ||
871 | if (hash_expected && !hash_location) { | |
872 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
873 | return 1; |
874 | } | |
875 | ||
785957d3 DM |
876 | if (!hash_expected && hash_location) { |
877 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
878 | return 1; |
879 | } | |
880 | ||
881 | /* check the signature */ | |
49a72dfb AL |
882 | genhash = tcp_v6_md5_hash_skb(newhash, |
883 | hash_expected, | |
884 | NULL, NULL, skb); | |
885 | ||
cfb6eeb4 YH |
886 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
887 | if (net_ratelimit()) { | |
5856b606 | 888 | printk(KERN_INFO "MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
cfb6eeb4 | 889 | genhash ? "failed" : "mismatch", |
0c6ce78a HH |
890 | &ip6h->saddr, ntohs(th->source), |
891 | &ip6h->daddr, ntohs(th->dest)); | |
cfb6eeb4 YH |
892 | } |
893 | return 1; | |
894 | } | |
895 | return 0; | |
896 | } | |
897 | #endif | |
898 | ||
c6aefafb | 899 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 900 | .family = AF_INET6, |
2e6599cb | 901 | .obj_size = sizeof(struct tcp6_request_sock), |
72659ecc | 902 | .rtx_syn_ack = tcp_v6_rtx_synack, |
60236fdd ACM |
903 | .send_ack = tcp_v6_reqsk_send_ack, |
904 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc OP |
905 | .send_reset = tcp_v6_send_reset, |
906 | .syn_ack_timeout = tcp_syn_ack_timeout, | |
1da177e4 LT |
907 | }; |
908 | ||
cfb6eeb4 | 909 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 910 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 911 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 912 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 913 | }; |
b6332e6c | 914 | #endif |
cfb6eeb4 | 915 | |
8ad50d96 HX |
916 | static void __tcp_v6_send_check(struct sk_buff *skb, |
917 | struct in6_addr *saddr, struct in6_addr *daddr) | |
1da177e4 | 918 | { |
aa8223c7 | 919 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 920 | |
84fa7933 | 921 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
8ad50d96 | 922 | th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0); |
663ead3b | 923 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 924 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 925 | } else { |
8ad50d96 HX |
926 | th->check = tcp_v6_check(skb->len, saddr, daddr, |
927 | csum_partial(th, th->doff << 2, | |
928 | skb->csum)); | |
1da177e4 LT |
929 | } |
930 | } | |
931 | ||
bb296246 | 932 | static void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
8ad50d96 HX |
933 | { |
934 | struct ipv6_pinfo *np = inet6_sk(sk); | |
935 | ||
936 | __tcp_v6_send_check(skb, &np->saddr, &np->daddr); | |
937 | } | |
938 | ||
a430a43d HX |
939 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
940 | { | |
941 | struct ipv6hdr *ipv6h; | |
942 | struct tcphdr *th; | |
943 | ||
944 | if (!pskb_may_pull(skb, sizeof(*th))) | |
945 | return -EINVAL; | |
946 | ||
0660e03f | 947 | ipv6h = ipv6_hdr(skb); |
aa8223c7 | 948 | th = tcp_hdr(skb); |
a430a43d HX |
949 | |
950 | th->check = 0; | |
84fa7933 | 951 | skb->ip_summed = CHECKSUM_PARTIAL; |
8ad50d96 | 952 | __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr); |
a430a43d HX |
953 | return 0; |
954 | } | |
1da177e4 | 955 | |
36990673 HX |
956 | static struct sk_buff **tcp6_gro_receive(struct sk_buff **head, |
957 | struct sk_buff *skb) | |
684f2176 | 958 | { |
36e7b1b8 | 959 | struct ipv6hdr *iph = skb_gro_network_header(skb); |
684f2176 HX |
960 | |
961 | switch (skb->ip_summed) { | |
962 | case CHECKSUM_COMPLETE: | |
86911732 | 963 | if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr, |
684f2176 HX |
964 | skb->csum)) { |
965 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
966 | break; | |
967 | } | |
968 | ||
969 | /* fall through */ | |
970 | case CHECKSUM_NONE: | |
971 | NAPI_GRO_CB(skb)->flush = 1; | |
972 | return NULL; | |
973 | } | |
974 | ||
975 | return tcp_gro_receive(head, skb); | |
976 | } | |
684f2176 | 977 | |
36990673 | 978 | static int tcp6_gro_complete(struct sk_buff *skb) |
684f2176 HX |
979 | { |
980 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
981 | struct tcphdr *th = tcp_hdr(skb); | |
982 | ||
983 | th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb), | |
984 | &iph->saddr, &iph->daddr, 0); | |
985 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
986 | ||
987 | return tcp_gro_complete(skb); | |
988 | } | |
684f2176 | 989 | |
626e264d IJ |
990 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
991 | u32 ts, struct tcp_md5sig_key *key, int rst) | |
1da177e4 | 992 | { |
aa8223c7 | 993 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
994 | struct sk_buff *buff; |
995 | struct flowi fl; | |
adf30907 | 996 | struct net *net = dev_net(skb_dst(skb)->dev); |
e5047992 | 997 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 998 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 999 | struct dst_entry *dst; |
81ada62d | 1000 | __be32 *topt; |
1da177e4 | 1001 | |
626e264d IJ |
1002 | if (ts) |
1003 | tot_len += TCPOLEN_TSTAMP_ALIGNED; | |
cfb6eeb4 | 1004 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
1005 | if (key) |
1006 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
1007 | #endif | |
1008 | ||
cfb6eeb4 | 1009 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 1010 | GFP_ATOMIC); |
1ab1457c YH |
1011 | if (buff == NULL) |
1012 | return; | |
1da177e4 | 1013 | |
cfb6eeb4 | 1014 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 1015 | |
cfb6eeb4 | 1016 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 1017 | skb_reset_transport_header(buff); |
1da177e4 LT |
1018 | |
1019 | /* Swap the send and the receive. */ | |
1020 | memset(t1, 0, sizeof(*t1)); | |
1021 | t1->dest = th->source; | |
1022 | t1->source = th->dest; | |
cfb6eeb4 | 1023 | t1->doff = tot_len / 4; |
626e264d IJ |
1024 | t1->seq = htonl(seq); |
1025 | t1->ack_seq = htonl(ack); | |
1026 | t1->ack = !rst || !th->ack; | |
1027 | t1->rst = rst; | |
1028 | t1->window = htons(win); | |
1da177e4 | 1029 | |
81ada62d IJ |
1030 | topt = (__be32 *)(t1 + 1); |
1031 | ||
626e264d IJ |
1032 | if (ts) { |
1033 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
1034 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
1035 | *topt++ = htonl(tcp_time_stamp); | |
1036 | *topt++ = htonl(ts); | |
1037 | } | |
1038 | ||
cfb6eeb4 YH |
1039 | #ifdef CONFIG_TCP_MD5SIG |
1040 | if (key) { | |
81ada62d IJ |
1041 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
1042 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
1043 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
1044 | &ipv6_hdr(skb)->saddr, |
1045 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
1046 | } |
1047 | #endif | |
1048 | ||
1da177e4 | 1049 | memset(&fl, 0, sizeof(fl)); |
0660e03f ACM |
1050 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
1051 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 | 1052 | |
e5700aff DM |
1053 | buff->ip_summed = CHECKSUM_PARTIAL; |
1054 | buff->csum = 0; | |
1055 | ||
8ad50d96 | 1056 | __tcp_v6_send_check(buff, &fl.fl6_src, &fl.fl6_dst); |
1da177e4 | 1057 | |
1d28f42c DM |
1058 | fl.flowi_proto = IPPROTO_TCP; |
1059 | fl.flowi_oif = inet6_iif(skb); | |
1da177e4 LT |
1060 | fl.fl_ip_dport = t1->dest; |
1061 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 1062 | security_skb_classify_flow(skb, &fl); |
1da177e4 | 1063 | |
c20121ae DL |
1064 | /* Pass a socket to ip6_dst_lookup either it is for RST |
1065 | * Underlying function will use this to retrieve the network | |
1066 | * namespace | |
1067 | */ | |
68d0c6d3 DM |
1068 | dst = ip6_dst_lookup_flow(ctl_sk, &fl, NULL, false); |
1069 | if (!IS_ERR(dst)) { | |
1070 | skb_dst_set(buff, dst); | |
1071 | ip6_xmit(ctl_sk, buff, &fl, NULL); | |
1072 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); | |
1073 | if (rst) | |
1074 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
1075 | return; | |
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 |
af9b4738 | 1160 | if (!th->syn) |
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; |
493f377d | 1179 | struct dst_entry *dst = NULL; |
c6aefafb GG |
1180 | #ifdef CONFIG_SYN_COOKIES |
1181 | int want_cookie = 0; | |
1182 | #else | |
1183 | #define want_cookie 0 | |
1184 | #endif | |
1da177e4 LT |
1185 | |
1186 | if (skb->protocol == htons(ETH_P_IP)) | |
1187 | return tcp_v4_conn_request(sk, skb); | |
1188 | ||
1189 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1190 | goto drop; |
1da177e4 | 1191 | |
463c84b9 | 1192 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 | 1193 | if (net_ratelimit()) |
c6aefafb GG |
1194 | syn_flood_warning(skb); |
1195 | #ifdef CONFIG_SYN_COOKIES | |
1196 | if (sysctl_tcp_syncookies) | |
1197 | want_cookie = 1; | |
1198 | else | |
1199 | #endif | |
1ab1457c | 1200 | goto drop; |
1da177e4 LT |
1201 | } |
1202 | ||
463c84b9 | 1203 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1204 | goto drop; |
1205 | ||
ca304b61 | 1206 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1207 | if (req == NULL) |
1208 | goto drop; | |
1209 | ||
cfb6eeb4 YH |
1210 | #ifdef CONFIG_TCP_MD5SIG |
1211 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
1212 | #endif | |
1213 | ||
1da177e4 LT |
1214 | tcp_clear_options(&tmp_opt); |
1215 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1216 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
bb5b7c11 | 1217 | tcp_parse_options(skb, &tmp_opt, &hash_location, 0); |
4957faad WAS |
1218 | |
1219 | if (tmp_opt.cookie_plus > 0 && | |
1220 | tmp_opt.saw_tstamp && | |
1221 | !tp->rx_opt.cookie_out_never && | |
1222 | (sysctl_tcp_cookie_size > 0 || | |
1223 | (tp->cookie_values != NULL && | |
1224 | tp->cookie_values->cookie_desired > 0))) { | |
1225 | u8 *c; | |
1226 | u32 *d; | |
1227 | u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS]; | |
1228 | int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE; | |
1229 | ||
1230 | if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0) | |
1231 | goto drop_and_free; | |
1232 | ||
1233 | /* Secret recipe starts with IP addresses */ | |
0eae88f3 | 1234 | d = (__force u32 *)&ipv6_hdr(skb)->daddr.s6_addr32[0]; |
4957faad WAS |
1235 | *mess++ ^= *d++; |
1236 | *mess++ ^= *d++; | |
1237 | *mess++ ^= *d++; | |
1238 | *mess++ ^= *d++; | |
0eae88f3 | 1239 | d = (__force u32 *)&ipv6_hdr(skb)->saddr.s6_addr32[0]; |
4957faad WAS |
1240 | *mess++ ^= *d++; |
1241 | *mess++ ^= *d++; | |
1242 | *mess++ ^= *d++; | |
1243 | *mess++ ^= *d++; | |
1244 | ||
1245 | /* plus variable length Initiator Cookie */ | |
1246 | c = (u8 *)mess; | |
1247 | while (l-- > 0) | |
1248 | *c++ ^= *hash_location++; | |
1da177e4 | 1249 | |
4957faad WAS |
1250 | #ifdef CONFIG_SYN_COOKIES |
1251 | want_cookie = 0; /* not our kind of cookie */ | |
1252 | #endif | |
1253 | tmp_ext.cookie_out_never = 0; /* false */ | |
1254 | tmp_ext.cookie_plus = tmp_opt.cookie_plus; | |
1255 | } else if (!tp->rx_opt.cookie_in_always) { | |
1256 | /* redundant indications, but ensure initialization. */ | |
1257 | tmp_ext.cookie_out_never = 1; /* true */ | |
1258 | tmp_ext.cookie_plus = 0; | |
1259 | } else { | |
1260 | goto drop_and_free; | |
1261 | } | |
1262 | tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always; | |
1da177e4 | 1263 | |
4dfc2817 | 1264 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 1265 | tcp_clear_options(&tmp_opt); |
c6aefafb | 1266 | |
1da177e4 LT |
1267 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1268 | tcp_openreq_init(req, &tmp_opt, skb); | |
1269 | ||
ca304b61 | 1270 | treq = inet6_rsk(req); |
0660e03f ACM |
1271 | ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr); |
1272 | ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr); | |
172d69e6 | 1273 | if (!want_cookie || tmp_opt.tstamp_ok) |
c6aefafb GG |
1274 | TCP_ECN_create_request(req, tcp_hdr(skb)); |
1275 | ||
2bbdf389 | 1276 | if (!isn) { |
493f377d DM |
1277 | struct inet_peer *peer = NULL; |
1278 | ||
c6aefafb GG |
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); | |
493f377d DM |
1291 | |
1292 | if (want_cookie) { | |
2bbdf389 FW |
1293 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); |
1294 | req->cookie_ts = tmp_opt.tstamp_ok; | |
493f377d DM |
1295 | goto have_isn; |
1296 | } | |
1297 | ||
1298 | /* VJ's idea. We save last timestamp seen | |
1299 | * from the destination in peer table, when entering | |
1300 | * state TIME-WAIT, and check against it before | |
1301 | * accepting new connection request. | |
1302 | * | |
1303 | * If "isn" is not zero, this request hit alive | |
1304 | * timewait bucket, so that all the necessary checks | |
1305 | * are made in the function processing timewait state. | |
1306 | */ | |
1307 | if (tmp_opt.saw_tstamp && | |
1308 | tcp_death_row.sysctl_tw_recycle && | |
1309 | (dst = inet6_csk_route_req(sk, req)) != NULL && | |
1310 | (peer = rt6_get_peer((struct rt6_info *)dst)) != NULL && | |
7a71ed89 | 1311 | ipv6_addr_equal((struct in6_addr *)peer->daddr.addr.a6, |
493f377d DM |
1312 | &treq->rmt_addr)) { |
1313 | inet_peer_refcheck(peer); | |
1314 | if ((u32)get_seconds() - peer->tcp_ts_stamp < TCP_PAWS_MSL && | |
1315 | (s32)(peer->tcp_ts - req->ts_recent) > | |
1316 | TCP_PAWS_WINDOW) { | |
1317 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); | |
1318 | goto drop_and_release; | |
1319 | } | |
1320 | } | |
1321 | /* Kill the following clause, if you dislike this way. */ | |
1322 | else if (!sysctl_tcp_syncookies && | |
1323 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < | |
1324 | (sysctl_max_syn_backlog >> 2)) && | |
1325 | (!peer || !peer->tcp_ts_stamp) && | |
1326 | (!dst || !dst_metric(dst, RTAX_RTT))) { | |
1327 | /* Without syncookies last quarter of | |
1328 | * backlog is filled with destinations, | |
1329 | * proven to be alive. | |
1330 | * It means that we continue to communicate | |
1331 | * to destinations, already remembered | |
1332 | * to the moment of synflood. | |
1333 | */ | |
1334 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n", | |
1335 | &treq->rmt_addr, ntohs(tcp_hdr(skb)->source)); | |
1336 | goto drop_and_release; | |
2bbdf389 | 1337 | } |
493f377d DM |
1338 | |
1339 | isn = tcp_v6_init_sequence(skb); | |
c6aefafb | 1340 | } |
493f377d | 1341 | have_isn: |
2e6599cb | 1342 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1343 | |
4237c75c VY |
1344 | security_inet_conn_request(sk, skb, req); |
1345 | ||
4957faad WAS |
1346 | if (tcp_v6_send_synack(sk, req, |
1347 | (struct request_values *)&tmp_ext) || | |
1348 | want_cookie) | |
e6b4d113 | 1349 | goto drop_and_free; |
1da177e4 | 1350 | |
e6b4d113 WAS |
1351 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1352 | return 0; | |
1da177e4 | 1353 | |
493f377d DM |
1354 | drop_and_release: |
1355 | dst_release(dst); | |
e6b4d113 WAS |
1356 | drop_and_free: |
1357 | reqsk_free(req); | |
1da177e4 | 1358 | drop: |
1da177e4 LT |
1359 | return 0; /* don't send reset */ |
1360 | } | |
1361 | ||
1362 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1363 | struct request_sock *req, |
1da177e4 LT |
1364 | struct dst_entry *dst) |
1365 | { | |
78d15e82 | 1366 | struct inet6_request_sock *treq; |
1da177e4 LT |
1367 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1368 | struct tcp6_sock *newtcp6sk; | |
1369 | struct inet_sock *newinet; | |
1370 | struct tcp_sock *newtp; | |
1371 | struct sock *newsk; | |
1372 | struct ipv6_txoptions *opt; | |
cfb6eeb4 YH |
1373 | #ifdef CONFIG_TCP_MD5SIG |
1374 | struct tcp_md5sig_key *key; | |
1375 | #endif | |
1da177e4 LT |
1376 | |
1377 | if (skb->protocol == htons(ETH_P_IP)) { | |
1378 | /* | |
1379 | * v6 mapped | |
1380 | */ | |
1381 | ||
1382 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1383 | ||
1ab1457c | 1384 | if (newsk == NULL) |
1da177e4 LT |
1385 | return NULL; |
1386 | ||
1387 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1388 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1389 | ||
1390 | newinet = inet_sk(newsk); | |
1391 | newnp = inet6_sk(newsk); | |
1392 | newtp = tcp_sk(newsk); | |
1393 | ||
1394 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1395 | ||
c720c7e8 | 1396 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); |
1da177e4 | 1397 | |
c720c7e8 | 1398 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 LT |
1399 | |
1400 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1401 | ||
8292a17a | 1402 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1403 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1404 | #ifdef CONFIG_TCP_MD5SIG |
1405 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1406 | #endif | |
1407 | ||
1da177e4 LT |
1408 | newnp->pktoptions = NULL; |
1409 | newnp->opt = NULL; | |
505cbfc5 | 1410 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1411 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 | 1412 | |
e6848976 ACM |
1413 | /* |
1414 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1415 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1416 | * that function for the gory details. -acme | |
1da177e4 | 1417 | */ |
1da177e4 LT |
1418 | |
1419 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1420 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1421 | Sync it now. |
1422 | */ | |
d83d8461 | 1423 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1424 | |
1425 | return newsk; | |
1426 | } | |
1427 | ||
78d15e82 | 1428 | treq = inet6_rsk(req); |
1da177e4 LT |
1429 | opt = np->opt; |
1430 | ||
1431 | if (sk_acceptq_is_full(sk)) | |
1432 | goto out_overflow; | |
1433 | ||
493f377d DM |
1434 | if (!dst) { |
1435 | dst = inet6_csk_route_req(sk, req); | |
1436 | if (!dst) | |
1da177e4 | 1437 | goto out; |
1ab1457c | 1438 | } |
1da177e4 LT |
1439 | |
1440 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1441 | if (newsk == NULL) | |
093d2823 | 1442 | goto out_nonewsk; |
1da177e4 | 1443 | |
e6848976 ACM |
1444 | /* |
1445 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1446 | * count here, tcp_create_openreq_child now does this for us, see the | |
1447 | * comment in that function for the gory details. -acme | |
1448 | */ | |
1da177e4 | 1449 | |
59eed279 | 1450 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1451 | __ip6_dst_store(newsk, dst, NULL, NULL); |
1da177e4 LT |
1452 | |
1453 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1454 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1455 | ||
1456 | newtp = tcp_sk(newsk); | |
1457 | newinet = inet_sk(newsk); | |
1458 | newnp = inet6_sk(newsk); | |
1459 | ||
1460 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1461 | ||
2e6599cb ACM |
1462 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1463 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1464 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1465 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 | 1466 | |
1ab1457c | 1467 | /* Now IPv6 options... |
1da177e4 LT |
1468 | |
1469 | First: no IPv4 options. | |
1470 | */ | |
1471 | newinet->opt = NULL; | |
d35690be | 1472 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1473 | |
1474 | /* Clone RX bits */ | |
1475 | newnp->rxopt.all = np->rxopt.all; | |
1476 | ||
1477 | /* Clone pktoptions received with SYN */ | |
1478 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1479 | if (treq->pktopts != NULL) { |
1480 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1481 | kfree_skb(treq->pktopts); | |
1482 | treq->pktopts = NULL; | |
1da177e4 LT |
1483 | if (newnp->pktoptions) |
1484 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1485 | } | |
1486 | newnp->opt = NULL; | |
505cbfc5 | 1487 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1488 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
1489 | |
1490 | /* Clone native IPv6 options from listening socket (if any) | |
1491 | ||
1492 | Yes, keeping reference count would be much more clever, | |
1493 | but we make one more one thing there: reattach optmem | |
1494 | to newsk. | |
1495 | */ | |
1496 | if (opt) { | |
1497 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1498 | if (opt != np->opt) | |
1499 | sock_kfree_s(sk, opt, opt->tot_len); | |
1500 | } | |
1501 | ||
d83d8461 | 1502 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1503 | if (newnp->opt) |
d83d8461 ACM |
1504 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1505 | newnp->opt->opt_flen); | |
1da177e4 | 1506 | |
5d424d5a | 1507 | tcp_mtup_init(newsk); |
1da177e4 | 1508 | tcp_sync_mss(newsk, dst_mtu(dst)); |
0dbaee3b | 1509 | newtp->advmss = dst_metric_advmss(dst); |
1da177e4 LT |
1510 | tcp_initialize_rcv_mss(newsk); |
1511 | ||
c720c7e8 ED |
1512 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1513 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1514 | |
cfb6eeb4 YH |
1515 | #ifdef CONFIG_TCP_MD5SIG |
1516 | /* Copy over the MD5 key from the original socket */ | |
1517 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1518 | /* We're using one, so create a matching key | |
1519 | * on the newsk structure. If we fail to get | |
1520 | * memory, then we end up not copying the key | |
1521 | * across. Shucks. | |
1522 | */ | |
af879cc7 ACM |
1523 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1524 | if (newkey != NULL) | |
e547bc1e | 1525 | tcp_v6_md5_do_add(newsk, &newnp->daddr, |
cfb6eeb4 | 1526 | newkey, key->keylen); |
cfb6eeb4 YH |
1527 | } |
1528 | #endif | |
1529 | ||
093d2823 BS |
1530 | if (__inet_inherit_port(sk, newsk) < 0) { |
1531 | sock_put(newsk); | |
1532 | goto out; | |
1533 | } | |
9327f705 | 1534 | __inet6_hash(newsk, NULL); |
1da177e4 LT |
1535 | |
1536 | return newsk; | |
1537 | ||
1538 | out_overflow: | |
de0744af | 1539 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1540 | out_nonewsk: |
1da177e4 LT |
1541 | if (opt && opt != np->opt) |
1542 | sock_kfree_s(sk, opt, opt->tot_len); | |
1543 | dst_release(dst); | |
093d2823 BS |
1544 | out: |
1545 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); | |
1da177e4 LT |
1546 | return NULL; |
1547 | } | |
1548 | ||
b51655b9 | 1549 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1550 | { |
84fa7933 | 1551 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
684f2176 | 1552 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1553 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1554 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1555 | return 0; |
fb286bb2 | 1556 | } |
1da177e4 | 1557 | } |
fb286bb2 | 1558 | |
684f2176 | 1559 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
0660e03f ACM |
1560 | &ipv6_hdr(skb)->saddr, |
1561 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1562 | |
1da177e4 | 1563 | if (skb->len <= 76) { |
fb286bb2 | 1564 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1565 | } |
1566 | return 0; | |
1567 | } | |
1568 | ||
1569 | /* The socket must have it's spinlock held when we get | |
1570 | * here. | |
1571 | * | |
1572 | * We have a potential double-lock case here, so even when | |
1573 | * doing backlog processing we use the BH locking scheme. | |
1574 | * This is because we cannot sleep with the original spinlock | |
1575 | * held. | |
1576 | */ | |
1577 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1578 | { | |
1579 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1580 | struct tcp_sock *tp; | |
1581 | struct sk_buff *opt_skb = NULL; | |
1582 | ||
1583 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1584 | goes to IPv4 receive handler and backlogged. | |
1585 | From backlog it always goes here. Kerboom... | |
1586 | Fortunately, tcp_rcv_established and rcv_established | |
1587 | handle them correctly, but it is not case with | |
1588 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1589 | */ | |
1590 | ||
1591 | if (skb->protocol == htons(ETH_P_IP)) | |
1592 | return tcp_v4_do_rcv(sk, skb); | |
1593 | ||
cfb6eeb4 YH |
1594 | #ifdef CONFIG_TCP_MD5SIG |
1595 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1596 | goto discard; | |
1597 | #endif | |
1598 | ||
fda9ef5d | 1599 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1600 | goto discard; |
1601 | ||
1602 | /* | |
1603 | * socket locking is here for SMP purposes as backlog rcv | |
1604 | * is currently called with bh processing disabled. | |
1605 | */ | |
1606 | ||
1607 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1608 | ||
1609 | Yes, guys, it is the only place in our code, where we | |
1610 | may make it not affecting IPv4. | |
1611 | The rest of code is protocol independent, | |
1612 | and I do not like idea to uglify IPv4. | |
1613 | ||
1614 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1615 | looks not very well thought. For now we latch | |
1616 | options, received in the last packet, enqueued | |
1617 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1618 | --ANK (980728) |
1da177e4 LT |
1619 | */ |
1620 | if (np->rxopt.all) | |
1621 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1622 | ||
1623 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
aa8223c7 | 1624 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1625 | goto reset; |
1da177e4 LT |
1626 | if (opt_skb) |
1627 | goto ipv6_pktoptions; | |
1628 | return 0; | |
1629 | } | |
1630 | ||
ab6a5bb6 | 1631 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1632 | goto csum_err; |
1633 | ||
1ab1457c | 1634 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1635 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1636 | if (!nsk) | |
1637 | goto discard; | |
1638 | ||
1639 | /* | |
1640 | * Queue it on the new socket if the new socket is active, | |
1641 | * otherwise we just shortcircuit this and continue with | |
1642 | * the new socket.. | |
1643 | */ | |
1ab1457c | 1644 | if(nsk != sk) { |
1da177e4 LT |
1645 | if (tcp_child_process(sk, nsk, skb)) |
1646 | goto reset; | |
1647 | if (opt_skb) | |
1648 | __kfree_skb(opt_skb); | |
1649 | return 0; | |
1650 | } | |
1651 | } | |
1652 | ||
aa8223c7 | 1653 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1654 | goto reset; |
1da177e4 LT |
1655 | if (opt_skb) |
1656 | goto ipv6_pktoptions; | |
1657 | return 0; | |
1658 | ||
1659 | reset: | |
cfb6eeb4 | 1660 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1661 | discard: |
1662 | if (opt_skb) | |
1663 | __kfree_skb(opt_skb); | |
1664 | kfree_skb(skb); | |
1665 | return 0; | |
1666 | csum_err: | |
63231bdd | 1667 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1668 | goto discard; |
1669 | ||
1670 | ||
1671 | ipv6_pktoptions: | |
1672 | /* Do you ask, what is it? | |
1673 | ||
1674 | 1. skb was enqueued by tcp. | |
1675 | 2. skb is added to tail of read queue, rather than out of order. | |
1676 | 3. socket is not in passive state. | |
1677 | 4. Finally, it really contains options, which user wants to receive. | |
1678 | */ | |
1679 | tp = tcp_sk(sk); | |
1680 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1681 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1682 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1683 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1684 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1685 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
1da177e4 LT |
1686 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1687 | skb_set_owner_r(opt_skb, sk); | |
1688 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1689 | } else { | |
1690 | __kfree_skb(opt_skb); | |
1691 | opt_skb = xchg(&np->pktoptions, NULL); | |
1692 | } | |
1693 | } | |
1694 | ||
800d55f1 | 1695 | kfree_skb(opt_skb); |
1da177e4 LT |
1696 | return 0; |
1697 | } | |
1698 | ||
e5bbef20 | 1699 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1700 | { |
1ab1457c | 1701 | struct tcphdr *th; |
e802af9c | 1702 | struct ipv6hdr *hdr; |
1da177e4 LT |
1703 | struct sock *sk; |
1704 | int ret; | |
a86b1e30 | 1705 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1706 | |
1707 | if (skb->pkt_type != PACKET_HOST) | |
1708 | goto discard_it; | |
1709 | ||
1710 | /* | |
1711 | * Count it even if it's bad. | |
1712 | */ | |
63231bdd | 1713 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1714 | |
1715 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1716 | goto discard_it; | |
1717 | ||
aa8223c7 | 1718 | th = tcp_hdr(skb); |
1da177e4 LT |
1719 | |
1720 | if (th->doff < sizeof(struct tcphdr)/4) | |
1721 | goto bad_packet; | |
1722 | if (!pskb_may_pull(skb, th->doff*4)) | |
1723 | goto discard_it; | |
1724 | ||
60476372 | 1725 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1da177e4 LT |
1726 | goto bad_packet; |
1727 | ||
aa8223c7 | 1728 | th = tcp_hdr(skb); |
e802af9c | 1729 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
1730 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1731 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1732 | skb->len - th->doff*4); | |
1733 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1734 | TCP_SKB_CB(skb)->when = 0; | |
e802af9c | 1735 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(hdr); |
1da177e4 LT |
1736 | TCP_SKB_CB(skb)->sacked = 0; |
1737 | ||
9a1f27c4 | 1738 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1739 | if (!sk) |
1740 | goto no_tcp_socket; | |
1741 | ||
1742 | process: | |
1743 | if (sk->sk_state == TCP_TIME_WAIT) | |
1744 | goto do_time_wait; | |
1745 | ||
e802af9c SH |
1746 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1747 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1748 | goto discard_and_relse; | |
1749 | } | |
1750 | ||
1da177e4 LT |
1751 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1752 | goto discard_and_relse; | |
1753 | ||
fda9ef5d | 1754 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1755 | goto discard_and_relse; |
1756 | ||
1757 | skb->dev = NULL; | |
1758 | ||
293b9c42 | 1759 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1760 | ret = 0; |
1761 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1762 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1763 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a | 1764 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
f67b4599 | 1765 | tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY); |
1ab1457c YH |
1766 | if (tp->ucopy.dma_chan) |
1767 | ret = tcp_v6_do_rcv(sk, skb); | |
1768 | else | |
1a2449a8 CL |
1769 | #endif |
1770 | { | |
1771 | if (!tcp_prequeue(sk, skb)) | |
1772 | ret = tcp_v6_do_rcv(sk, skb); | |
1773 | } | |
6cce09f8 | 1774 | } else if (unlikely(sk_add_backlog(sk, skb))) { |
6b03a53a | 1775 | bh_unlock_sock(sk); |
6cce09f8 | 1776 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1777 | goto discard_and_relse; |
1778 | } | |
1da177e4 LT |
1779 | bh_unlock_sock(sk); |
1780 | ||
1781 | sock_put(sk); | |
1782 | return ret ? -1 : 0; | |
1783 | ||
1784 | no_tcp_socket: | |
1785 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1786 | goto discard_it; | |
1787 | ||
1788 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1789 | bad_packet: | |
63231bdd | 1790 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1791 | } else { |
cfb6eeb4 | 1792 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1793 | } |
1794 | ||
1795 | discard_it: | |
1796 | ||
1797 | /* | |
1798 | * Discard frame | |
1799 | */ | |
1800 | ||
1801 | kfree_skb(skb); | |
1802 | return 0; | |
1803 | ||
1804 | discard_and_relse: | |
1805 | sock_put(sk); | |
1806 | goto discard_it; | |
1807 | ||
1808 | do_time_wait: | |
1809 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1810 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1811 | goto discard_it; |
1812 | } | |
1813 | ||
1814 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
63231bdd | 1815 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
9469c7b4 | 1816 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1817 | goto discard_it; |
1818 | } | |
1819 | ||
9469c7b4 | 1820 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1821 | case TCP_TW_SYN: |
1822 | { | |
1823 | struct sock *sk2; | |
1824 | ||
c346dca1 | 1825 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
0660e03f | 1826 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1827 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1828 | if (sk2 != NULL) { |
295ff7ed ACM |
1829 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1830 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1831 | inet_twsk_put(tw); | |
1da177e4 LT |
1832 | sk = sk2; |
1833 | goto process; | |
1834 | } | |
1835 | /* Fall through to ACK */ | |
1836 | } | |
1837 | case TCP_TW_ACK: | |
1838 | tcp_v6_timewait_ack(sk, skb); | |
1839 | break; | |
1840 | case TCP_TW_RST: | |
1841 | goto no_tcp_socket; | |
1842 | case TCP_TW_SUCCESS:; | |
1843 | } | |
1844 | goto discard_it; | |
1845 | } | |
1846 | ||
ccb7c410 DM |
1847 | static struct inet_peer *tcp_v6_get_peer(struct sock *sk, bool *release_it) |
1848 | { | |
db3949c4 DM |
1849 | struct rt6_info *rt = (struct rt6_info *) __sk_dst_get(sk); |
1850 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1851 | struct inet_peer *peer; | |
1852 | ||
1853 | if (!rt || | |
1854 | !ipv6_addr_equal(&np->daddr, &rt->rt6i_dst.addr)) { | |
1855 | peer = inet_getpeer_v6(&np->daddr, 1); | |
1856 | *release_it = true; | |
1857 | } else { | |
1858 | if (!rt->rt6i_peer) | |
1859 | rt6_bind_peer(rt, 1); | |
1860 | peer = rt->rt6i_peer; | |
457de438 | 1861 | *release_it = false; |
db3949c4 DM |
1862 | } |
1863 | ||
1864 | return peer; | |
ccb7c410 DM |
1865 | } |
1866 | ||
1867 | static void *tcp_v6_tw_get_peer(struct sock *sk) | |
1da177e4 | 1868 | { |
db3949c4 | 1869 | struct inet6_timewait_sock *tw6 = inet6_twsk(sk); |
ccb7c410 DM |
1870 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1871 | ||
1872 | if (tw->tw_family == AF_INET) | |
1873 | return tcp_v4_tw_get_peer(sk); | |
1874 | ||
db3949c4 | 1875 | return inet_getpeer_v6(&tw6->tw_v6_daddr, 1); |
1da177e4 LT |
1876 | } |
1877 | ||
ccb7c410 DM |
1878 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1879 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1880 | .twsk_unique = tcp_twsk_unique, | |
1881 | .twsk_destructor= tcp_twsk_destructor, | |
1882 | .twsk_getpeer = tcp_v6_tw_get_peer, | |
1883 | }; | |
1884 | ||
3b401a81 | 1885 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1886 | .queue_xmit = inet6_csk_xmit, |
1887 | .send_check = tcp_v6_send_check, | |
1888 | .rebuild_header = inet6_sk_rebuild_header, | |
1889 | .conn_request = tcp_v6_conn_request, | |
1890 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
3f419d2d | 1891 | .get_peer = tcp_v6_get_peer, |
543d9cfe ACM |
1892 | .net_header_len = sizeof(struct ipv6hdr), |
1893 | .setsockopt = ipv6_setsockopt, | |
1894 | .getsockopt = ipv6_getsockopt, | |
1895 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1896 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1897 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1898 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1899 | .compat_setsockopt = compat_ipv6_setsockopt, |
1900 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1901 | #endif |
1da177e4 LT |
1902 | }; |
1903 | ||
cfb6eeb4 | 1904 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1905 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1906 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1907 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 YH |
1908 | .md5_add = tcp_v6_md5_add_func, |
1909 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1910 | }; |
a928630a | 1911 | #endif |
cfb6eeb4 | 1912 | |
1da177e4 LT |
1913 | /* |
1914 | * TCP over IPv4 via INET6 API | |
1915 | */ | |
1916 | ||
3b401a81 | 1917 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1918 | .queue_xmit = ip_queue_xmit, |
1919 | .send_check = tcp_v4_send_check, | |
1920 | .rebuild_header = inet_sk_rebuild_header, | |
1921 | .conn_request = tcp_v6_conn_request, | |
1922 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
3f419d2d | 1923 | .get_peer = tcp_v4_get_peer, |
543d9cfe ACM |
1924 | .net_header_len = sizeof(struct iphdr), |
1925 | .setsockopt = ipv6_setsockopt, | |
1926 | .getsockopt = ipv6_getsockopt, | |
1927 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1928 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1929 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1930 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1931 | .compat_setsockopt = compat_ipv6_setsockopt, |
1932 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1933 | #endif |
1da177e4 LT |
1934 | }; |
1935 | ||
cfb6eeb4 | 1936 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1937 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1938 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1939 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 YH |
1940 | .md5_add = tcp_v6_md5_add_func, |
1941 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1942 | }; |
a928630a | 1943 | #endif |
cfb6eeb4 | 1944 | |
1da177e4 LT |
1945 | /* NOTE: A lot of things set to zero explicitly by call to |
1946 | * sk_alloc() so need not be done here. | |
1947 | */ | |
1948 | static int tcp_v6_init_sock(struct sock *sk) | |
1949 | { | |
6687e988 | 1950 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1951 | struct tcp_sock *tp = tcp_sk(sk); |
1952 | ||
1953 | skb_queue_head_init(&tp->out_of_order_queue); | |
1954 | tcp_init_xmit_timers(sk); | |
1955 | tcp_prequeue_init(tp); | |
1956 | ||
6687e988 | 1957 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1958 | tp->mdev = TCP_TIMEOUT_INIT; |
1959 | ||
1960 | /* So many TCP implementations out there (incorrectly) count the | |
1961 | * initial SYN frame in their delayed-ACK and congestion control | |
1962 | * algorithms that we must have the following bandaid to talk | |
1963 | * efficiently to them. -DaveM | |
1964 | */ | |
1965 | tp->snd_cwnd = 2; | |
1966 | ||
1967 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1968 | * initialization of these values. | |
1969 | */ | |
0b6a05c1 | 1970 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; |
1da177e4 | 1971 | tp->snd_cwnd_clamp = ~0; |
bee7ca9e | 1972 | tp->mss_cache = TCP_MSS_DEFAULT; |
1da177e4 LT |
1973 | |
1974 | tp->reordering = sysctl_tcp_reordering; | |
1975 | ||
1976 | sk->sk_state = TCP_CLOSE; | |
1977 | ||
8292a17a | 1978 | icsk->icsk_af_ops = &ipv6_specific; |
6687e988 | 1979 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
d83d8461 | 1980 | icsk->icsk_sync_mss = tcp_sync_mss; |
1da177e4 LT |
1981 | sk->sk_write_space = sk_stream_write_space; |
1982 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1983 | ||
cfb6eeb4 YH |
1984 | #ifdef CONFIG_TCP_MD5SIG |
1985 | tp->af_specific = &tcp_sock_ipv6_specific; | |
1986 | #endif | |
1987 | ||
435cf559 WAS |
1988 | /* TCP Cookie Transactions */ |
1989 | if (sysctl_tcp_cookie_size > 0) { | |
1990 | /* Default, cookies without s_data_payload. */ | |
1991 | tp->cookie_values = | |
1992 | kzalloc(sizeof(*tp->cookie_values), | |
1993 | sk->sk_allocation); | |
1994 | if (tp->cookie_values != NULL) | |
1995 | kref_init(&tp->cookie_values->kref); | |
1996 | } | |
1997 | /* Presumed zeroed, in order of appearance: | |
1998 | * cookie_in_always, cookie_out_never, | |
1999 | * s_data_constant, s_data_in, s_data_out | |
2000 | */ | |
1da177e4 LT |
2001 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
2002 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
2003 | ||
eb4dea58 | 2004 | local_bh_disable(); |
1748376b | 2005 | percpu_counter_inc(&tcp_sockets_allocated); |
eb4dea58 | 2006 | local_bh_enable(); |
1da177e4 LT |
2007 | |
2008 | return 0; | |
2009 | } | |
2010 | ||
7d06b2e0 | 2011 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 2012 | { |
cfb6eeb4 YH |
2013 | #ifdef CONFIG_TCP_MD5SIG |
2014 | /* Clean up the MD5 key list */ | |
2015 | if (tcp_sk(sk)->md5sig_info) | |
2016 | tcp_v6_clear_md5_list(sk); | |
2017 | #endif | |
1da177e4 | 2018 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 2019 | inet6_destroy_sock(sk); |
1da177e4 LT |
2020 | } |
2021 | ||
952a10be | 2022 | #ifdef CONFIG_PROC_FS |
1da177e4 | 2023 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 2024 | static void get_openreq6(struct seq_file *seq, |
60236fdd | 2025 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 2026 | { |
1da177e4 | 2027 | int ttd = req->expires - jiffies; |
ca304b61 ACM |
2028 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
2029 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
2030 | |
2031 | if (ttd < 0) | |
2032 | ttd = 0; | |
2033 | ||
1da177e4 LT |
2034 | seq_printf(seq, |
2035 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2036 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
2037 | i, | |
2038 | src->s6_addr32[0], src->s6_addr32[1], | |
2039 | src->s6_addr32[2], src->s6_addr32[3], | |
fd507037 | 2040 | ntohs(inet_rsk(req)->loc_port), |
1da177e4 LT |
2041 | dest->s6_addr32[0], dest->s6_addr32[1], |
2042 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 2043 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
2044 | TCP_SYN_RECV, |
2045 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
2046 | 1, /* timers active (only the expire timer) */ |
2047 | jiffies_to_clock_t(ttd), | |
1da177e4 LT |
2048 | req->retrans, |
2049 | uid, | |
1ab1457c | 2050 | 0, /* non standard timer */ |
1da177e4 LT |
2051 | 0, /* open_requests have no inode */ |
2052 | 0, req); | |
2053 | } | |
2054 | ||
2055 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
2056 | { | |
2057 | struct in6_addr *dest, *src; | |
2058 | __u16 destp, srcp; | |
2059 | int timer_active; | |
2060 | unsigned long timer_expires; | |
2061 | struct inet_sock *inet = inet_sk(sp); | |
2062 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 2063 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
2064 | struct ipv6_pinfo *np = inet6_sk(sp); |
2065 | ||
2066 | dest = &np->daddr; | |
2067 | src = &np->rcv_saddr; | |
c720c7e8 ED |
2068 | destp = ntohs(inet->inet_dport); |
2069 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
2070 | |
2071 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 2072 | timer_active = 1; |
463c84b9 ACM |
2073 | timer_expires = icsk->icsk_timeout; |
2074 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 2075 | timer_active = 4; |
463c84b9 | 2076 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
2077 | } else if (timer_pending(&sp->sk_timer)) { |
2078 | timer_active = 2; | |
2079 | timer_expires = sp->sk_timer.expires; | |
2080 | } else { | |
2081 | timer_active = 0; | |
2082 | timer_expires = jiffies; | |
2083 | } | |
2084 | ||
2085 | seq_printf(seq, | |
2086 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
7be87351 | 2087 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n", |
1da177e4 LT |
2088 | i, |
2089 | src->s6_addr32[0], src->s6_addr32[1], | |
2090 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2091 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2092 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 2093 | sp->sk_state, |
47da8ee6 SS |
2094 | tp->write_seq-tp->snd_una, |
2095 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 LT |
2096 | timer_active, |
2097 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 2098 | icsk->icsk_retransmits, |
1da177e4 | 2099 | sock_i_uid(sp), |
6687e988 | 2100 | icsk->icsk_probes_out, |
1da177e4 LT |
2101 | sock_i_ino(sp), |
2102 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
2103 | jiffies_to_clock_t(icsk->icsk_rto), |
2104 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 2105 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
0b6a05c1 IJ |
2106 | tp->snd_cwnd, |
2107 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh | |
1da177e4 LT |
2108 | ); |
2109 | } | |
2110 | ||
1ab1457c | 2111 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 2112 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
2113 | { |
2114 | struct in6_addr *dest, *src; | |
2115 | __u16 destp, srcp; | |
0fa1a53e | 2116 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
2117 | int ttd = tw->tw_ttd - jiffies; |
2118 | ||
2119 | if (ttd < 0) | |
2120 | ttd = 0; | |
2121 | ||
0fa1a53e ACM |
2122 | dest = &tw6->tw_v6_daddr; |
2123 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
2124 | destp = ntohs(tw->tw_dport); |
2125 | srcp = ntohs(tw->tw_sport); | |
2126 | ||
2127 | seq_printf(seq, | |
2128 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2129 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
2130 | i, | |
2131 | src->s6_addr32[0], src->s6_addr32[1], | |
2132 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2133 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2134 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2135 | tw->tw_substate, 0, 0, | |
2136 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2137 | atomic_read(&tw->tw_refcnt), tw); | |
2138 | } | |
2139 | ||
1da177e4 LT |
2140 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
2141 | { | |
2142 | struct tcp_iter_state *st; | |
2143 | ||
2144 | if (v == SEQ_START_TOKEN) { | |
2145 | seq_puts(seq, | |
2146 | " sl " | |
2147 | "local_address " | |
2148 | "remote_address " | |
2149 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2150 | " uid timeout inode\n"); | |
2151 | goto out; | |
2152 | } | |
2153 | st = seq->private; | |
2154 | ||
2155 | switch (st->state) { | |
2156 | case TCP_SEQ_STATE_LISTENING: | |
2157 | case TCP_SEQ_STATE_ESTABLISHED: | |
2158 | get_tcp6_sock(seq, v, st->num); | |
2159 | break; | |
2160 | case TCP_SEQ_STATE_OPENREQ: | |
2161 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
2162 | break; | |
2163 | case TCP_SEQ_STATE_TIME_WAIT: | |
2164 | get_timewait6_sock(seq, v, st->num); | |
2165 | break; | |
2166 | } | |
2167 | out: | |
2168 | return 0; | |
2169 | } | |
2170 | ||
1da177e4 | 2171 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
2172 | .name = "tcp6", |
2173 | .family = AF_INET6, | |
5f4472c5 DL |
2174 | .seq_fops = { |
2175 | .owner = THIS_MODULE, | |
2176 | }, | |
9427c4b3 DL |
2177 | .seq_ops = { |
2178 | .show = tcp6_seq_show, | |
2179 | }, | |
1da177e4 LT |
2180 | }; |
2181 | ||
2c8c1e72 | 2182 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 2183 | { |
6f8b13bc | 2184 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2185 | } |
2186 | ||
6f8b13bc | 2187 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2188 | { |
6f8b13bc | 2189 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2190 | } |
2191 | #endif | |
2192 | ||
2193 | struct proto tcpv6_prot = { | |
2194 | .name = "TCPv6", | |
2195 | .owner = THIS_MODULE, | |
2196 | .close = tcp_close, | |
2197 | .connect = tcp_v6_connect, | |
2198 | .disconnect = tcp_disconnect, | |
463c84b9 | 2199 | .accept = inet_csk_accept, |
1da177e4 LT |
2200 | .ioctl = tcp_ioctl, |
2201 | .init = tcp_v6_init_sock, | |
2202 | .destroy = tcp_v6_destroy_sock, | |
2203 | .shutdown = tcp_shutdown, | |
2204 | .setsockopt = tcp_setsockopt, | |
2205 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 2206 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
2207 | .sendmsg = tcp_sendmsg, |
2208 | .sendpage = tcp_sendpage, | |
1da177e4 LT |
2209 | .backlog_rcv = tcp_v6_do_rcv, |
2210 | .hash = tcp_v6_hash, | |
ab1e0a13 ACM |
2211 | .unhash = inet_unhash, |
2212 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2213 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2214 | .sockets_allocated = &tcp_sockets_allocated, | |
2215 | .memory_allocated = &tcp_memory_allocated, | |
2216 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2217 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2218 | .sysctl_mem = sysctl_tcp_mem, |
2219 | .sysctl_wmem = sysctl_tcp_wmem, | |
2220 | .sysctl_rmem = sysctl_tcp_rmem, | |
2221 | .max_header = MAX_TCP_HEADER, | |
2222 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 2223 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 2224 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2225 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2226 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 2227 | .no_autobind = true, |
543d9cfe ACM |
2228 | #ifdef CONFIG_COMPAT |
2229 | .compat_setsockopt = compat_tcp_setsockopt, | |
2230 | .compat_getsockopt = compat_tcp_getsockopt, | |
2231 | #endif | |
1da177e4 LT |
2232 | }; |
2233 | ||
41135cc8 | 2234 | static const struct inet6_protocol tcpv6_protocol = { |
1da177e4 LT |
2235 | .handler = tcp_v6_rcv, |
2236 | .err_handler = tcp_v6_err, | |
a430a43d | 2237 | .gso_send_check = tcp_v6_gso_send_check, |
adcfc7d0 | 2238 | .gso_segment = tcp_tso_segment, |
684f2176 HX |
2239 | .gro_receive = tcp6_gro_receive, |
2240 | .gro_complete = tcp6_gro_complete, | |
1da177e4 LT |
2241 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
2242 | }; | |
2243 | ||
1da177e4 LT |
2244 | static struct inet_protosw tcpv6_protosw = { |
2245 | .type = SOCK_STREAM, | |
2246 | .protocol = IPPROTO_TCP, | |
2247 | .prot = &tcpv6_prot, | |
2248 | .ops = &inet6_stream_ops, | |
1da177e4 | 2249 | .no_check = 0, |
d83d8461 ACM |
2250 | .flags = INET_PROTOSW_PERMANENT | |
2251 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2252 | }; |
2253 | ||
2c8c1e72 | 2254 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 2255 | { |
5677242f DL |
2256 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2257 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2258 | } |
2259 | ||
2c8c1e72 | 2260 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 2261 | { |
5677242f | 2262 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
2263 | } |
2264 | ||
2c8c1e72 | 2265 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
2266 | { |
2267 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
2268 | } |
2269 | ||
2270 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
2271 | .init = tcpv6_net_init, |
2272 | .exit = tcpv6_net_exit, | |
2273 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
2274 | }; |
2275 | ||
7f4e4868 | 2276 | int __init tcpv6_init(void) |
1da177e4 | 2277 | { |
7f4e4868 DL |
2278 | int ret; |
2279 | ||
2280 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2281 | if (ret) | |
2282 | goto out; | |
2283 | ||
1da177e4 | 2284 | /* register inet6 protocol */ |
7f4e4868 DL |
2285 | ret = inet6_register_protosw(&tcpv6_protosw); |
2286 | if (ret) | |
2287 | goto out_tcpv6_protocol; | |
2288 | ||
93ec926b | 2289 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2290 | if (ret) |
2291 | goto out_tcpv6_protosw; | |
2292 | out: | |
2293 | return ret; | |
ae0f7d5f | 2294 | |
7f4e4868 DL |
2295 | out_tcpv6_protocol: |
2296 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2297 | out_tcpv6_protosw: | |
2298 | inet6_unregister_protosw(&tcpv6_protosw); | |
2299 | goto out; | |
2300 | } | |
2301 | ||
09f7709f | 2302 | void tcpv6_exit(void) |
7f4e4868 | 2303 | { |
93ec926b | 2304 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2305 | inet6_unregister_protosw(&tcpv6_protosw); |
2306 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2307 | } |