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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> | |
41 | ||
42 | #include <linux/ipv6.h> | |
43 | #include <linux/icmpv6.h> | |
44 | #include <linux/random.h> | |
45 | ||
46 | #include <net/tcp.h> | |
47 | #include <net/ndisc.h> | |
5324a040 | 48 | #include <net/inet6_hashtables.h> |
8129765a | 49 | #include <net/inet6_connection_sock.h> |
1da177e4 LT |
50 | #include <net/ipv6.h> |
51 | #include <net/transp_v6.h> | |
52 | #include <net/addrconf.h> | |
53 | #include <net/ip6_route.h> | |
54 | #include <net/ip6_checksum.h> | |
55 | #include <net/inet_ecn.h> | |
56 | #include <net/protocol.h> | |
57 | #include <net/xfrm.h> | |
1da177e4 LT |
58 | #include <net/snmp.h> |
59 | #include <net/dsfield.h> | |
6d6ee43e | 60 | #include <net/timewait_sock.h> |
18134bed | 61 | #include <net/netdma.h> |
3d58b5fa | 62 | #include <net/inet_common.h> |
1da177e4 LT |
63 | |
64 | #include <asm/uaccess.h> | |
65 | ||
66 | #include <linux/proc_fs.h> | |
67 | #include <linux/seq_file.h> | |
68 | ||
cfb6eeb4 YH |
69 | #include <linux/crypto.h> |
70 | #include <linux/scatterlist.h> | |
71 | ||
cfb6eeb4 | 72 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
6edafaaf GJ |
73 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
74 | struct request_sock *req); | |
1da177e4 LT |
75 | |
76 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 77 | |
3b401a81 SH |
78 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
79 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 80 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
81 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
82 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
83 | #else |
84 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
85 | struct in6_addr *addr) | |
86 | { | |
87 | return NULL; | |
88 | } | |
a928630a | 89 | #endif |
1da177e4 | 90 | |
1da177e4 LT |
91 | static void tcp_v6_hash(struct sock *sk) |
92 | { | |
93 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 94 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
95 | tcp_prot.hash(sk); |
96 | return; | |
97 | } | |
98 | local_bh_disable(); | |
ab1e0a13 | 99 | __inet6_hash(sk); |
1da177e4 LT |
100 | local_bh_enable(); |
101 | } | |
102 | } | |
103 | ||
684f2176 | 104 | static __inline__ __sum16 tcp_v6_check(int len, |
1ab1457c YH |
105 | struct in6_addr *saddr, |
106 | struct in6_addr *daddr, | |
868c86bc | 107 | __wsum base) |
1da177e4 LT |
108 | { |
109 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
110 | } | |
111 | ||
a94f723d | 112 | static __u32 tcp_v6_init_sequence(struct sk_buff *skb) |
1da177e4 | 113 | { |
0660e03f ACM |
114 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
115 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
116 | tcp_hdr(skb)->dest, |
117 | tcp_hdr(skb)->source); | |
1da177e4 LT |
118 | } |
119 | ||
1ab1457c | 120 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
121 | int addr_len) |
122 | { | |
123 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 124 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 125 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
126 | struct ipv6_pinfo *np = inet6_sk(sk); |
127 | struct tcp_sock *tp = tcp_sk(sk); | |
128 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
129 | struct flowi fl; | |
130 | struct dst_entry *dst; | |
131 | int addr_type; | |
132 | int err; | |
133 | ||
1ab1457c | 134 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
135 | return -EINVAL; |
136 | ||
1ab1457c | 137 | if (usin->sin6_family != AF_INET6) |
1da177e4 LT |
138 | return(-EAFNOSUPPORT); |
139 | ||
140 | memset(&fl, 0, sizeof(fl)); | |
141 | ||
142 | if (np->sndflow) { | |
143 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
144 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
145 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
146 | struct ip6_flowlabel *flowlabel; | |
147 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
148 | if (flowlabel == NULL) | |
149 | return -EINVAL; | |
150 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
151 | fl6_sock_release(flowlabel); | |
152 | } | |
153 | } | |
154 | ||
155 | /* | |
1ab1457c YH |
156 | * connect() to INADDR_ANY means loopback (BSD'ism). |
157 | */ | |
158 | ||
159 | if(ipv6_addr_any(&usin->sin6_addr)) | |
160 | usin->sin6_addr.s6_addr[15] = 0x1; | |
1da177e4 LT |
161 | |
162 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
163 | ||
164 | if(addr_type & IPV6_ADDR_MULTICAST) | |
165 | return -ENETUNREACH; | |
166 | ||
167 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
168 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
169 | usin->sin6_scope_id) { | |
170 | /* If interface is set while binding, indices | |
171 | * must coincide. | |
172 | */ | |
173 | if (sk->sk_bound_dev_if && | |
174 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
175 | return -EINVAL; | |
176 | ||
177 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
178 | } | |
179 | ||
180 | /* Connect to link-local address requires an interface */ | |
181 | if (!sk->sk_bound_dev_if) | |
182 | return -EINVAL; | |
183 | } | |
184 | ||
185 | if (tp->rx_opt.ts_recent_stamp && | |
186 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
187 | tp->rx_opt.ts_recent = 0; | |
188 | tp->rx_opt.ts_recent_stamp = 0; | |
189 | tp->write_seq = 0; | |
190 | } | |
191 | ||
192 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
193 | np->flow_label = fl.fl6_flowlabel; | |
194 | ||
195 | /* | |
196 | * TCP over IPv4 | |
197 | */ | |
198 | ||
199 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 200 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
201 | struct sockaddr_in sin; |
202 | ||
203 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
204 | ||
205 | if (__ipv6_only_sock(sk)) | |
206 | return -ENETUNREACH; | |
207 | ||
208 | sin.sin_family = AF_INET; | |
209 | sin.sin_port = usin->sin6_port; | |
210 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
211 | ||
d83d8461 | 212 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 213 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
214 | #ifdef CONFIG_TCP_MD5SIG |
215 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
216 | #endif | |
1da177e4 LT |
217 | |
218 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
219 | ||
220 | if (err) { | |
d83d8461 ACM |
221 | icsk->icsk_ext_hdr_len = exthdrlen; |
222 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 223 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
224 | #ifdef CONFIG_TCP_MD5SIG |
225 | tp->af_specific = &tcp_sock_ipv6_specific; | |
226 | #endif | |
1da177e4 LT |
227 | goto failure; |
228 | } else { | |
c720c7e8 ED |
229 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
230 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, | |
231 | &np->rcv_saddr); | |
1da177e4 LT |
232 | } |
233 | ||
234 | return err; | |
235 | } | |
236 | ||
237 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
238 | saddr = &np->rcv_saddr; | |
239 | ||
240 | fl.proto = IPPROTO_TCP; | |
241 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
242 | ipv6_addr_copy(&fl.fl6_src, | |
243 | (saddr ? saddr : &np->saddr)); | |
244 | fl.oif = sk->sk_bound_dev_if; | |
51953d5b | 245 | fl.mark = sk->sk_mark; |
1da177e4 | 246 | fl.fl_ip_dport = usin->sin6_port; |
c720c7e8 | 247 | fl.fl_ip_sport = inet->inet_sport; |
1da177e4 LT |
248 | |
249 | if (np->opt && np->opt->srcrt) { | |
250 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
251 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
252 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
253 | final_p = &final; | |
254 | } | |
255 | ||
beb8d13b VY |
256 | security_sk_classify_flow(sk, &fl); |
257 | ||
1da177e4 LT |
258 | err = ip6_dst_lookup(sk, &dst, &fl); |
259 | if (err) | |
260 | goto failure; | |
261 | if (final_p) | |
262 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
263 | ||
52479b62 AD |
264 | err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); |
265 | if (err < 0) { | |
14e50e57 DM |
266 | if (err == -EREMOTE) |
267 | err = ip6_dst_blackhole(sk, &dst, &fl); | |
268 | if (err < 0) | |
269 | goto failure; | |
270 | } | |
1da177e4 LT |
271 | |
272 | if (saddr == NULL) { | |
273 | saddr = &fl.fl6_src; | |
274 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
275 | } | |
276 | ||
277 | /* set the source address */ | |
278 | ipv6_addr_copy(&np->saddr, saddr); | |
c720c7e8 | 279 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 280 | |
f83ef8c0 | 281 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 282 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 283 | |
d83d8461 | 284 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 285 | if (np->opt) |
d83d8461 ACM |
286 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
287 | np->opt->opt_nflen); | |
1da177e4 LT |
288 | |
289 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
290 | ||
c720c7e8 | 291 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
292 | |
293 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 294 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
295 | if (err) |
296 | goto late_failure; | |
297 | ||
298 | if (!tp->write_seq) | |
299 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
300 | np->daddr.s6_addr32, | |
c720c7e8 ED |
301 | inet->inet_sport, |
302 | inet->inet_dport); | |
1da177e4 LT |
303 | |
304 | err = tcp_connect(sk); | |
305 | if (err) | |
306 | goto late_failure; | |
307 | ||
308 | return 0; | |
309 | ||
310 | late_failure: | |
311 | tcp_set_state(sk, TCP_CLOSE); | |
312 | __sk_dst_reset(sk); | |
313 | failure: | |
c720c7e8 | 314 | inet->inet_dport = 0; |
1da177e4 LT |
315 | sk->sk_route_caps = 0; |
316 | return err; | |
317 | } | |
318 | ||
319 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 320 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 LT |
321 | { |
322 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
505cbfc5 | 323 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
324 | struct ipv6_pinfo *np; |
325 | struct sock *sk; | |
326 | int err; | |
1ab1457c | 327 | struct tcp_sock *tp; |
1da177e4 | 328 | __u32 seq; |
ca12a1a4 | 329 | struct net *net = dev_net(skb->dev); |
1da177e4 | 330 | |
ca12a1a4 | 331 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 332 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
333 | |
334 | if (sk == NULL) { | |
e41b5368 DL |
335 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
336 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
337 | return; |
338 | } | |
339 | ||
340 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 341 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
342 | return; |
343 | } | |
344 | ||
345 | bh_lock_sock(sk); | |
346 | if (sock_owned_by_user(sk)) | |
de0744af | 347 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
348 | |
349 | if (sk->sk_state == TCP_CLOSE) | |
350 | goto out; | |
351 | ||
352 | tp = tcp_sk(sk); | |
1ab1457c | 353 | seq = ntohl(th->seq); |
1da177e4 LT |
354 | if (sk->sk_state != TCP_LISTEN && |
355 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
de0744af | 356 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
357 | goto out; |
358 | } | |
359 | ||
360 | np = inet6_sk(sk); | |
361 | ||
362 | if (type == ICMPV6_PKT_TOOBIG) { | |
363 | struct dst_entry *dst = NULL; | |
364 | ||
365 | if (sock_owned_by_user(sk)) | |
366 | goto out; | |
367 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
368 | goto out; | |
369 | ||
370 | /* icmp should have updated the destination cache entry */ | |
371 | dst = __sk_dst_check(sk, np->dst_cookie); | |
372 | ||
373 | if (dst == NULL) { | |
374 | struct inet_sock *inet = inet_sk(sk); | |
375 | struct flowi fl; | |
376 | ||
377 | /* BUGGG_FUTURE: Again, it is not clear how | |
378 | to handle rthdr case. Ignore this complexity | |
379 | for now. | |
380 | */ | |
381 | memset(&fl, 0, sizeof(fl)); | |
382 | fl.proto = IPPROTO_TCP; | |
383 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
384 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
385 | fl.oif = sk->sk_bound_dev_if; | |
51953d5b | 386 | fl.mark = sk->sk_mark; |
c720c7e8 ED |
387 | fl.fl_ip_dport = inet->inet_dport; |
388 | fl.fl_ip_sport = inet->inet_sport; | |
beb8d13b | 389 | security_skb_classify_flow(skb, &fl); |
1da177e4 LT |
390 | |
391 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
392 | sk->sk_err_soft = -err; | |
393 | goto out; | |
394 | } | |
395 | ||
52479b62 | 396 | if ((err = xfrm_lookup(net, &dst, &fl, sk, 0)) < 0) { |
1da177e4 LT |
397 | sk->sk_err_soft = -err; |
398 | goto out; | |
399 | } | |
400 | ||
401 | } else | |
402 | dst_hold(dst); | |
403 | ||
d83d8461 | 404 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
1da177e4 LT |
405 | tcp_sync_mss(sk, dst_mtu(dst)); |
406 | tcp_simple_retransmit(sk); | |
407 | } /* else let the usual retransmit timer handle it */ | |
408 | dst_release(dst); | |
409 | goto out; | |
410 | } | |
411 | ||
412 | icmpv6_err_convert(type, code, &err); | |
413 | ||
60236fdd | 414 | /* Might be for an request_sock */ |
1da177e4 | 415 | switch (sk->sk_state) { |
60236fdd | 416 | struct request_sock *req, **prev; |
1da177e4 LT |
417 | case TCP_LISTEN: |
418 | if (sock_owned_by_user(sk)) | |
419 | goto out; | |
420 | ||
8129765a ACM |
421 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
422 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
423 | if (!req) |
424 | goto out; | |
425 | ||
426 | /* ICMPs are not backlogged, hence we cannot get | |
427 | * an established socket here. | |
428 | */ | |
547b792c | 429 | WARN_ON(req->sk != NULL); |
1da177e4 | 430 | |
2e6599cb | 431 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 432 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
433 | goto out; |
434 | } | |
435 | ||
463c84b9 | 436 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
437 | goto out; |
438 | ||
439 | case TCP_SYN_SENT: | |
440 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 441 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 442 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
443 | sk->sk_err = err; |
444 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
445 | ||
446 | tcp_done(sk); | |
447 | } else | |
448 | sk->sk_err_soft = err; | |
449 | goto out; | |
450 | } | |
451 | ||
452 | if (!sock_owned_by_user(sk) && np->recverr) { | |
453 | sk->sk_err = err; | |
454 | sk->sk_error_report(sk); | |
455 | } else | |
456 | sk->sk_err_soft = err; | |
457 | ||
458 | out: | |
459 | bh_unlock_sock(sk); | |
460 | sock_put(sk); | |
461 | } | |
462 | ||
463 | ||
e6b4d113 WAS |
464 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, |
465 | struct request_values *rvp) | |
1da177e4 | 466 | { |
ca304b61 | 467 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
468 | struct ipv6_pinfo *np = inet6_sk(sk); |
469 | struct sk_buff * skb; | |
470 | struct ipv6_txoptions *opt = NULL; | |
471 | struct in6_addr * final_p = NULL, final; | |
472 | struct flowi fl; | |
fd80eb94 | 473 | struct dst_entry *dst; |
1da177e4 LT |
474 | int err = -1; |
475 | ||
476 | memset(&fl, 0, sizeof(fl)); | |
477 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
478 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
479 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 480 | fl.fl6_flowlabel = 0; |
2e6599cb | 481 | fl.oif = treq->iif; |
51953d5b | 482 | fl.mark = sk->sk_mark; |
2e6599cb | 483 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
fd507037 | 484 | fl.fl_ip_sport = inet_rsk(req)->loc_port; |
4237c75c | 485 | security_req_classify_flow(req, &fl); |
1da177e4 | 486 | |
fd80eb94 DL |
487 | opt = np->opt; |
488 | if (opt && opt->srcrt) { | |
489 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
490 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
491 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
492 | final_p = &final; | |
1da177e4 LT |
493 | } |
494 | ||
fd80eb94 DL |
495 | err = ip6_dst_lookup(sk, &dst, &fl); |
496 | if (err) | |
497 | goto done; | |
498 | if (final_p) | |
499 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
52479b62 | 500 | if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) |
fd80eb94 DL |
501 | goto done; |
502 | ||
e6b4d113 | 503 | skb = tcp_make_synack(sk, dst, req, rvp); |
1da177e4 | 504 | if (skb) { |
aa8223c7 | 505 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 506 | |
684f2176 | 507 | th->check = tcp_v6_check(skb->len, |
2e6599cb | 508 | &treq->loc_addr, &treq->rmt_addr, |
07f0757a | 509 | csum_partial(th, skb->len, skb->csum)); |
1da177e4 | 510 | |
2e6599cb | 511 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 | 512 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
b9df3cb8 | 513 | err = net_xmit_eval(err); |
1da177e4 LT |
514 | } |
515 | ||
516 | done: | |
1ab1457c | 517 | if (opt && opt != np->opt) |
1da177e4 | 518 | sock_kfree_s(sk, opt, opt->tot_len); |
78b91042 | 519 | dst_release(dst); |
1da177e4 LT |
520 | return err; |
521 | } | |
522 | ||
c6aefafb GG |
523 | static inline void syn_flood_warning(struct sk_buff *skb) |
524 | { | |
525 | #ifdef CONFIG_SYN_COOKIES | |
526 | if (sysctl_tcp_syncookies) | |
527 | printk(KERN_INFO | |
528 | "TCPv6: Possible SYN flooding on port %d. " | |
529 | "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest)); | |
530 | else | |
531 | #endif | |
532 | printk(KERN_INFO | |
533 | "TCPv6: Possible SYN flooding on port %d. " | |
534 | "Dropping request.\n", ntohs(tcp_hdr(skb)->dest)); | |
535 | } | |
536 | ||
60236fdd | 537 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 538 | { |
800d55f1 | 539 | kfree_skb(inet6_rsk(req)->pktopts); |
1da177e4 LT |
540 | } |
541 | ||
cfb6eeb4 YH |
542 | #ifdef CONFIG_TCP_MD5SIG |
543 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
544 | struct in6_addr *addr) | |
545 | { | |
546 | struct tcp_sock *tp = tcp_sk(sk); | |
547 | int i; | |
548 | ||
549 | BUG_ON(tp == NULL); | |
550 | ||
551 | if (!tp->md5sig_info || !tp->md5sig_info->entries6) | |
552 | return NULL; | |
553 | ||
554 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 555 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr)) |
f8ab18d2 | 556 | return &tp->md5sig_info->keys6[i].base; |
cfb6eeb4 YH |
557 | } |
558 | return NULL; | |
559 | } | |
560 | ||
561 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
562 | struct sock *addr_sk) | |
563 | { | |
564 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); | |
565 | } | |
566 | ||
567 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
568 | struct request_sock *req) | |
569 | { | |
570 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
571 | } | |
572 | ||
573 | static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer, | |
574 | char *newkey, u8 newkeylen) | |
575 | { | |
576 | /* Add key to the list */ | |
b0a713e9 | 577 | struct tcp_md5sig_key *key; |
cfb6eeb4 YH |
578 | struct tcp_sock *tp = tcp_sk(sk); |
579 | struct tcp6_md5sig_key *keys; | |
580 | ||
b0a713e9 | 581 | key = tcp_v6_md5_do_lookup(sk, peer); |
cfb6eeb4 YH |
582 | if (key) { |
583 | /* modify existing entry - just update that one */ | |
b0a713e9 MD |
584 | kfree(key->key); |
585 | key->key = newkey; | |
586 | key->keylen = newkeylen; | |
cfb6eeb4 YH |
587 | } else { |
588 | /* reallocate new list if current one is full. */ | |
589 | if (!tp->md5sig_info) { | |
590 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC); | |
591 | if (!tp->md5sig_info) { | |
592 | kfree(newkey); | |
593 | return -ENOMEM; | |
594 | } | |
3d7dbeac | 595 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 | 596 | } |
aa133076 | 597 | if (tcp_alloc_md5sig_pool(sk) == NULL) { |
aacbe8c8 YH |
598 | kfree(newkey); |
599 | return -ENOMEM; | |
600 | } | |
cfb6eeb4 YH |
601 | if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) { |
602 | keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) * | |
603 | (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC); | |
604 | ||
605 | if (!keys) { | |
606 | tcp_free_md5sig_pool(); | |
607 | kfree(newkey); | |
608 | return -ENOMEM; | |
609 | } | |
610 | ||
611 | if (tp->md5sig_info->entries6) | |
612 | memmove(keys, tp->md5sig_info->keys6, | |
613 | (sizeof (tp->md5sig_info->keys6[0]) * | |
614 | tp->md5sig_info->entries6)); | |
615 | ||
616 | kfree(tp->md5sig_info->keys6); | |
617 | tp->md5sig_info->keys6 = keys; | |
618 | tp->md5sig_info->alloced6++; | |
619 | } | |
620 | ||
621 | ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr, | |
622 | peer); | |
f8ab18d2 DM |
623 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey; |
624 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen; | |
cfb6eeb4 YH |
625 | |
626 | tp->md5sig_info->entries6++; | |
627 | } | |
628 | return 0; | |
629 | } | |
630 | ||
631 | static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk, | |
632 | u8 *newkey, __u8 newkeylen) | |
633 | { | |
634 | return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr, | |
635 | newkey, newkeylen); | |
636 | } | |
637 | ||
638 | static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer) | |
639 | { | |
640 | struct tcp_sock *tp = tcp_sk(sk); | |
641 | int i; | |
642 | ||
643 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 644 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) { |
cfb6eeb4 | 645 | /* Free the key */ |
f8ab18d2 | 646 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
647 | tp->md5sig_info->entries6--; |
648 | ||
649 | if (tp->md5sig_info->entries6 == 0) { | |
650 | kfree(tp->md5sig_info->keys6); | |
651 | tp->md5sig_info->keys6 = NULL; | |
ca983cef | 652 | tp->md5sig_info->alloced6 = 0; |
cfb6eeb4 YH |
653 | } else { |
654 | /* shrink the database */ | |
655 | if (tp->md5sig_info->entries6 != i) | |
656 | memmove(&tp->md5sig_info->keys6[i], | |
657 | &tp->md5sig_info->keys6[i+1], | |
658 | (tp->md5sig_info->entries6 - i) | |
659 | * sizeof (tp->md5sig_info->keys6[0])); | |
660 | } | |
77adefdc YH |
661 | tcp_free_md5sig_pool(); |
662 | return 0; | |
cfb6eeb4 YH |
663 | } |
664 | } | |
665 | return -ENOENT; | |
666 | } | |
667 | ||
668 | static void tcp_v6_clear_md5_list (struct sock *sk) | |
669 | { | |
670 | struct tcp_sock *tp = tcp_sk(sk); | |
671 | int i; | |
672 | ||
673 | if (tp->md5sig_info->entries6) { | |
674 | for (i = 0; i < tp->md5sig_info->entries6; i++) | |
f8ab18d2 | 675 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
676 | tp->md5sig_info->entries6 = 0; |
677 | tcp_free_md5sig_pool(); | |
678 | } | |
679 | ||
680 | kfree(tp->md5sig_info->keys6); | |
681 | tp->md5sig_info->keys6 = NULL; | |
682 | tp->md5sig_info->alloced6 = 0; | |
683 | ||
684 | if (tp->md5sig_info->entries4) { | |
685 | for (i = 0; i < tp->md5sig_info->entries4; i++) | |
f8ab18d2 | 686 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
687 | tp->md5sig_info->entries4 = 0; |
688 | tcp_free_md5sig_pool(); | |
689 | } | |
690 | ||
691 | kfree(tp->md5sig_info->keys4); | |
692 | tp->md5sig_info->keys4 = NULL; | |
693 | tp->md5sig_info->alloced4 = 0; | |
694 | } | |
695 | ||
696 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, | |
697 | int optlen) | |
698 | { | |
699 | struct tcp_md5sig cmd; | |
700 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
701 | u8 *newkey; | |
702 | ||
703 | if (optlen < sizeof(cmd)) | |
704 | return -EINVAL; | |
705 | ||
706 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
707 | return -EFAULT; | |
708 | ||
709 | if (sin6->sin6_family != AF_INET6) | |
710 | return -EINVAL; | |
711 | ||
712 | if (!cmd.tcpm_keylen) { | |
713 | if (!tcp_sk(sk)->md5sig_info) | |
714 | return -ENOENT; | |
e773e4fa | 715 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
cfb6eeb4 YH |
716 | return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]); |
717 | return tcp_v6_md5_do_del(sk, &sin6->sin6_addr); | |
718 | } | |
719 | ||
720 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
721 | return -EINVAL; | |
722 | ||
723 | if (!tcp_sk(sk)->md5sig_info) { | |
724 | struct tcp_sock *tp = tcp_sk(sk); | |
725 | struct tcp_md5sig_info *p; | |
726 | ||
727 | p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL); | |
728 | if (!p) | |
729 | return -ENOMEM; | |
730 | ||
731 | tp->md5sig_info = p; | |
3d7dbeac | 732 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 YH |
733 | } |
734 | ||
af879cc7 | 735 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
736 | if (!newkey) |
737 | return -ENOMEM; | |
e773e4fa | 738 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { |
cfb6eeb4 YH |
739 | return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3], |
740 | newkey, cmd.tcpm_keylen); | |
741 | } | |
742 | return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen); | |
743 | } | |
744 | ||
49a72dfb AL |
745 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
746 | struct in6_addr *daddr, | |
747 | struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 748 | { |
cfb6eeb4 | 749 | struct tcp6_pseudohdr *bp; |
49a72dfb | 750 | struct scatterlist sg; |
8d26d76d | 751 | |
cfb6eeb4 | 752 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 YH |
753 | /* 1. TCP pseudo-header (RFC2460) */ |
754 | ipv6_addr_copy(&bp->saddr, saddr); | |
755 | ipv6_addr_copy(&bp->daddr, daddr); | |
49a72dfb | 756 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 757 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 758 | |
49a72dfb AL |
759 | sg_init_one(&sg, bp, sizeof(*bp)); |
760 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
761 | } | |
c7da57a1 | 762 | |
49a72dfb AL |
763 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
764 | struct in6_addr *daddr, struct in6_addr *saddr, | |
765 | struct tcphdr *th) | |
766 | { | |
767 | struct tcp_md5sig_pool *hp; | |
768 | struct hash_desc *desc; | |
769 | ||
770 | hp = tcp_get_md5sig_pool(); | |
771 | if (!hp) | |
772 | goto clear_hash_noput; | |
773 | desc = &hp->md5_desc; | |
774 | ||
775 | if (crypto_hash_init(desc)) | |
776 | goto clear_hash; | |
777 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
778 | goto clear_hash; | |
779 | if (tcp_md5_hash_header(hp, th)) | |
780 | goto clear_hash; | |
781 | if (tcp_md5_hash_key(hp, key)) | |
782 | goto clear_hash; | |
783 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 784 | goto clear_hash; |
cfb6eeb4 | 785 | |
cfb6eeb4 | 786 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 787 | return 0; |
49a72dfb | 788 | |
cfb6eeb4 YH |
789 | clear_hash: |
790 | tcp_put_md5sig_pool(); | |
791 | clear_hash_noput: | |
792 | memset(md5_hash, 0, 16); | |
49a72dfb | 793 | return 1; |
cfb6eeb4 YH |
794 | } |
795 | ||
49a72dfb AL |
796 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
797 | struct sock *sk, struct request_sock *req, | |
798 | struct sk_buff *skb) | |
cfb6eeb4 YH |
799 | { |
800 | struct in6_addr *saddr, *daddr; | |
49a72dfb AL |
801 | struct tcp_md5sig_pool *hp; |
802 | struct hash_desc *desc; | |
803 | struct tcphdr *th = tcp_hdr(skb); | |
cfb6eeb4 YH |
804 | |
805 | if (sk) { | |
806 | saddr = &inet6_sk(sk)->saddr; | |
807 | daddr = &inet6_sk(sk)->daddr; | |
49a72dfb | 808 | } else if (req) { |
cfb6eeb4 YH |
809 | saddr = &inet6_rsk(req)->loc_addr; |
810 | daddr = &inet6_rsk(req)->rmt_addr; | |
49a72dfb AL |
811 | } else { |
812 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
813 | saddr = &ip6h->saddr; | |
814 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 815 | } |
49a72dfb AL |
816 | |
817 | hp = tcp_get_md5sig_pool(); | |
818 | if (!hp) | |
819 | goto clear_hash_noput; | |
820 | desc = &hp->md5_desc; | |
821 | ||
822 | if (crypto_hash_init(desc)) | |
823 | goto clear_hash; | |
824 | ||
825 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
826 | goto clear_hash; | |
827 | if (tcp_md5_hash_header(hp, th)) | |
828 | goto clear_hash; | |
829 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
830 | goto clear_hash; | |
831 | if (tcp_md5_hash_key(hp, key)) | |
832 | goto clear_hash; | |
833 | if (crypto_hash_final(desc, md5_hash)) | |
834 | goto clear_hash; | |
835 | ||
836 | tcp_put_md5sig_pool(); | |
837 | return 0; | |
838 | ||
839 | clear_hash: | |
840 | tcp_put_md5sig_pool(); | |
841 | clear_hash_noput: | |
842 | memset(md5_hash, 0, 16); | |
843 | return 1; | |
cfb6eeb4 YH |
844 | } |
845 | ||
846 | static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb) | |
847 | { | |
848 | __u8 *hash_location = NULL; | |
849 | struct tcp_md5sig_key *hash_expected; | |
0660e03f | 850 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
aa8223c7 | 851 | struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 852 | int genhash; |
cfb6eeb4 YH |
853 | u8 newhash[16]; |
854 | ||
855 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 856 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 857 | |
785957d3 DM |
858 | /* We've parsed the options - do we have a hash? */ |
859 | if (!hash_expected && !hash_location) | |
860 | return 0; | |
861 | ||
862 | if (hash_expected && !hash_location) { | |
863 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
864 | return 1; |
865 | } | |
866 | ||
785957d3 DM |
867 | if (!hash_expected && hash_location) { |
868 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
869 | return 1; |
870 | } | |
871 | ||
872 | /* check the signature */ | |
49a72dfb AL |
873 | genhash = tcp_v6_md5_hash_skb(newhash, |
874 | hash_expected, | |
875 | NULL, NULL, skb); | |
876 | ||
cfb6eeb4 YH |
877 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
878 | if (net_ratelimit()) { | |
5b095d98 | 879 | printk(KERN_INFO "MD5 Hash %s for (%pI6, %u)->(%pI6, %u)\n", |
cfb6eeb4 | 880 | genhash ? "failed" : "mismatch", |
0c6ce78a HH |
881 | &ip6h->saddr, ntohs(th->source), |
882 | &ip6h->daddr, ntohs(th->dest)); | |
cfb6eeb4 YH |
883 | } |
884 | return 1; | |
885 | } | |
886 | return 0; | |
887 | } | |
888 | #endif | |
889 | ||
c6aefafb | 890 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 891 | .family = AF_INET6, |
2e6599cb | 892 | .obj_size = sizeof(struct tcp6_request_sock), |
1da177e4 | 893 | .rtx_syn_ack = tcp_v6_send_synack, |
60236fdd ACM |
894 | .send_ack = tcp_v6_reqsk_send_ack, |
895 | .destructor = tcp_v6_reqsk_destructor, | |
1da177e4 LT |
896 | .send_reset = tcp_v6_send_reset |
897 | }; | |
898 | ||
cfb6eeb4 | 899 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 900 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 901 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 902 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 903 | }; |
b6332e6c | 904 | #endif |
cfb6eeb4 | 905 | |
6d6ee43e ACM |
906 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
907 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
908 | .twsk_unique = tcp_twsk_unique, | |
cfb6eeb4 | 909 | .twsk_destructor= tcp_twsk_destructor, |
6d6ee43e ACM |
910 | }; |
911 | ||
8292a17a | 912 | static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) |
1da177e4 LT |
913 | { |
914 | struct ipv6_pinfo *np = inet6_sk(sk); | |
aa8223c7 | 915 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 916 | |
84fa7933 | 917 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1da177e4 | 918 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); |
663ead3b | 919 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 920 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 921 | } else { |
1ab1457c | 922 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, |
07f0757a | 923 | csum_partial(th, th->doff<<2, |
1da177e4 LT |
924 | skb->csum)); |
925 | } | |
926 | } | |
927 | ||
a430a43d HX |
928 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
929 | { | |
930 | struct ipv6hdr *ipv6h; | |
931 | struct tcphdr *th; | |
932 | ||
933 | if (!pskb_may_pull(skb, sizeof(*th))) | |
934 | return -EINVAL; | |
935 | ||
0660e03f | 936 | ipv6h = ipv6_hdr(skb); |
aa8223c7 | 937 | th = tcp_hdr(skb); |
a430a43d HX |
938 | |
939 | th->check = 0; | |
940 | th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, | |
941 | IPPROTO_TCP, 0); | |
663ead3b | 942 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 943 | skb->csum_offset = offsetof(struct tcphdr, check); |
84fa7933 | 944 | skb->ip_summed = CHECKSUM_PARTIAL; |
a430a43d HX |
945 | return 0; |
946 | } | |
1da177e4 | 947 | |
36990673 HX |
948 | static struct sk_buff **tcp6_gro_receive(struct sk_buff **head, |
949 | struct sk_buff *skb) | |
684f2176 | 950 | { |
36e7b1b8 | 951 | struct ipv6hdr *iph = skb_gro_network_header(skb); |
684f2176 HX |
952 | |
953 | switch (skb->ip_summed) { | |
954 | case CHECKSUM_COMPLETE: | |
86911732 | 955 | if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr, |
684f2176 HX |
956 | skb->csum)) { |
957 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
958 | break; | |
959 | } | |
960 | ||
961 | /* fall through */ | |
962 | case CHECKSUM_NONE: | |
963 | NAPI_GRO_CB(skb)->flush = 1; | |
964 | return NULL; | |
965 | } | |
966 | ||
967 | return tcp_gro_receive(head, skb); | |
968 | } | |
684f2176 | 969 | |
36990673 | 970 | static int tcp6_gro_complete(struct sk_buff *skb) |
684f2176 HX |
971 | { |
972 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
973 | struct tcphdr *th = tcp_hdr(skb); | |
974 | ||
975 | th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb), | |
976 | &iph->saddr, &iph->daddr, 0); | |
977 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
978 | ||
979 | return tcp_gro_complete(skb); | |
980 | } | |
684f2176 | 981 | |
626e264d IJ |
982 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
983 | u32 ts, struct tcp_md5sig_key *key, int rst) | |
1da177e4 | 984 | { |
aa8223c7 | 985 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
986 | struct sk_buff *buff; |
987 | struct flowi fl; | |
adf30907 | 988 | struct net *net = dev_net(skb_dst(skb)->dev); |
e5047992 | 989 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 990 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 991 | struct dst_entry *dst; |
81ada62d | 992 | __be32 *topt; |
1da177e4 | 993 | |
626e264d IJ |
994 | if (ts) |
995 | tot_len += TCPOLEN_TSTAMP_ALIGNED; | |
cfb6eeb4 | 996 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
997 | if (key) |
998 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
999 | #endif | |
1000 | ||
cfb6eeb4 | 1001 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 1002 | GFP_ATOMIC); |
1ab1457c YH |
1003 | if (buff == NULL) |
1004 | return; | |
1da177e4 | 1005 | |
cfb6eeb4 | 1006 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 1007 | |
cfb6eeb4 | 1008 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
a8fdf2b3 | 1009 | skb_reset_transport_header(skb); |
1da177e4 LT |
1010 | |
1011 | /* Swap the send and the receive. */ | |
1012 | memset(t1, 0, sizeof(*t1)); | |
1013 | t1->dest = th->source; | |
1014 | t1->source = th->dest; | |
cfb6eeb4 | 1015 | t1->doff = tot_len / 4; |
626e264d IJ |
1016 | t1->seq = htonl(seq); |
1017 | t1->ack_seq = htonl(ack); | |
1018 | t1->ack = !rst || !th->ack; | |
1019 | t1->rst = rst; | |
1020 | t1->window = htons(win); | |
1da177e4 | 1021 | |
81ada62d IJ |
1022 | topt = (__be32 *)(t1 + 1); |
1023 | ||
626e264d IJ |
1024 | if (ts) { |
1025 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
1026 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
1027 | *topt++ = htonl(tcp_time_stamp); | |
1028 | *topt++ = htonl(ts); | |
1029 | } | |
1030 | ||
cfb6eeb4 YH |
1031 | #ifdef CONFIG_TCP_MD5SIG |
1032 | if (key) { | |
81ada62d IJ |
1033 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
1034 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
1035 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
1036 | &ipv6_hdr(skb)->saddr, |
1037 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
1038 | } |
1039 | #endif | |
1040 | ||
07f0757a | 1041 | buff->csum = csum_partial(t1, tot_len, 0); |
1da177e4 LT |
1042 | |
1043 | memset(&fl, 0, sizeof(fl)); | |
0660e03f ACM |
1044 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
1045 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1046 | |
1047 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
52cd5750 | 1048 | tot_len, IPPROTO_TCP, |
1da177e4 LT |
1049 | buff->csum); |
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); | |
e5047992 | 1064 | ip6_xmit(ctl_sk, buff, &fl, NULL, 0); |
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 |
1da177e4 | 1154 | if (!th->rst && !th->syn && th->ack) |
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 | { | |
e6b4d113 WAS |
1165 | struct tcp_options_received tmp_opt; |
1166 | struct request_sock *req; | |
ca304b61 | 1167 | struct inet6_request_sock *treq; |
1da177e4 | 1168 | struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 | 1169 | struct tcp_sock *tp = tcp_sk(sk); |
022c3f7d | 1170 | struct dst_entry *dst = __sk_dst_get(sk); |
e6b4d113 | 1171 | __u32 isn = TCP_SKB_CB(skb)->when; |
c6aefafb GG |
1172 | #ifdef CONFIG_SYN_COOKIES |
1173 | int want_cookie = 0; | |
1174 | #else | |
1175 | #define want_cookie 0 | |
1176 | #endif | |
1da177e4 LT |
1177 | |
1178 | if (skb->protocol == htons(ETH_P_IP)) | |
1179 | return tcp_v4_conn_request(sk, skb); | |
1180 | ||
1181 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1182 | goto drop; |
1da177e4 | 1183 | |
463c84b9 | 1184 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 | 1185 | if (net_ratelimit()) |
c6aefafb GG |
1186 | syn_flood_warning(skb); |
1187 | #ifdef CONFIG_SYN_COOKIES | |
1188 | if (sysctl_tcp_syncookies) | |
1189 | want_cookie = 1; | |
1190 | else | |
1191 | #endif | |
1ab1457c | 1192 | goto drop; |
1da177e4 LT |
1193 | } |
1194 | ||
463c84b9 | 1195 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1196 | goto drop; |
1197 | ||
ca304b61 | 1198 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1199 | if (req == NULL) |
1200 | goto drop; | |
1201 | ||
cfb6eeb4 YH |
1202 | #ifdef CONFIG_TCP_MD5SIG |
1203 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
1204 | #endif | |
1205 | ||
1da177e4 LT |
1206 | tcp_clear_options(&tmp_opt); |
1207 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1208 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
1209 | ||
022c3f7d | 1210 | tcp_parse_options(skb, &tmp_opt, 0, dst); |
1da177e4 | 1211 | |
4dfc2817 | 1212 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 1213 | tcp_clear_options(&tmp_opt); |
c6aefafb | 1214 | |
1da177e4 LT |
1215 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1216 | tcp_openreq_init(req, &tmp_opt, skb); | |
1217 | ||
ca304b61 | 1218 | treq = inet6_rsk(req); |
0660e03f ACM |
1219 | ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr); |
1220 | ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr); | |
c6aefafb GG |
1221 | if (!want_cookie) |
1222 | TCP_ECN_create_request(req, tcp_hdr(skb)); | |
1223 | ||
1224 | if (want_cookie) { | |
1225 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); | |
4dfc2817 | 1226 | req->cookie_ts = tmp_opt.tstamp_ok; |
c6aefafb GG |
1227 | } else if (!isn) { |
1228 | if (ipv6_opt_accepted(sk, skb) || | |
1229 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1230 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1231 | atomic_inc(&skb->users); | |
1232 | treq->pktopts = skb; | |
1233 | } | |
1234 | treq->iif = sk->sk_bound_dev_if; | |
1da177e4 | 1235 | |
c6aefafb GG |
1236 | /* So that link locals have meaning */ |
1237 | if (!sk->sk_bound_dev_if && | |
1238 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1239 | treq->iif = inet6_iif(skb); | |
1da177e4 | 1240 | |
a94f723d | 1241 | isn = tcp_v6_init_sequence(skb); |
c6aefafb | 1242 | } |
2e6599cb | 1243 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1244 | |
4237c75c VY |
1245 | security_inet_conn_request(sk, skb, req); |
1246 | ||
e6b4d113 WAS |
1247 | if (tcp_v6_send_synack(sk, req, NULL) || want_cookie) |
1248 | goto drop_and_free; | |
1da177e4 | 1249 | |
e6b4d113 WAS |
1250 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1251 | return 0; | |
1da177e4 | 1252 | |
e6b4d113 WAS |
1253 | drop_and_free: |
1254 | reqsk_free(req); | |
1da177e4 | 1255 | drop: |
1da177e4 LT |
1256 | return 0; /* don't send reset */ |
1257 | } | |
1258 | ||
1259 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1260 | struct request_sock *req, |
1da177e4 LT |
1261 | struct dst_entry *dst) |
1262 | { | |
78d15e82 | 1263 | struct inet6_request_sock *treq; |
1da177e4 LT |
1264 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1265 | struct tcp6_sock *newtcp6sk; | |
1266 | struct inet_sock *newinet; | |
1267 | struct tcp_sock *newtp; | |
1268 | struct sock *newsk; | |
1269 | struct ipv6_txoptions *opt; | |
cfb6eeb4 YH |
1270 | #ifdef CONFIG_TCP_MD5SIG |
1271 | struct tcp_md5sig_key *key; | |
1272 | #endif | |
1da177e4 LT |
1273 | |
1274 | if (skb->protocol == htons(ETH_P_IP)) { | |
1275 | /* | |
1276 | * v6 mapped | |
1277 | */ | |
1278 | ||
1279 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1280 | ||
1ab1457c | 1281 | if (newsk == NULL) |
1da177e4 LT |
1282 | return NULL; |
1283 | ||
1284 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1285 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1286 | ||
1287 | newinet = inet_sk(newsk); | |
1288 | newnp = inet6_sk(newsk); | |
1289 | newtp = tcp_sk(newsk); | |
1290 | ||
1291 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1292 | ||
c720c7e8 | 1293 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); |
1da177e4 | 1294 | |
c720c7e8 | 1295 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 LT |
1296 | |
1297 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1298 | ||
8292a17a | 1299 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1300 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1301 | #ifdef CONFIG_TCP_MD5SIG |
1302 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1303 | #endif | |
1304 | ||
1da177e4 LT |
1305 | newnp->pktoptions = NULL; |
1306 | newnp->opt = NULL; | |
505cbfc5 | 1307 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1308 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 | 1309 | |
e6848976 ACM |
1310 | /* |
1311 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1312 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1313 | * that function for the gory details. -acme | |
1da177e4 | 1314 | */ |
1da177e4 LT |
1315 | |
1316 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1317 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1318 | Sync it now. |
1319 | */ | |
d83d8461 | 1320 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1321 | |
1322 | return newsk; | |
1323 | } | |
1324 | ||
78d15e82 | 1325 | treq = inet6_rsk(req); |
1da177e4 LT |
1326 | opt = np->opt; |
1327 | ||
1328 | if (sk_acceptq_is_full(sk)) | |
1329 | goto out_overflow; | |
1330 | ||
1da177e4 LT |
1331 | if (dst == NULL) { |
1332 | struct in6_addr *final_p = NULL, final; | |
1333 | struct flowi fl; | |
1334 | ||
1335 | memset(&fl, 0, sizeof(fl)); | |
1336 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1337 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
1338 | if (opt && opt->srcrt) { |
1339 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1340 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1341 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1342 | final_p = &final; | |
1343 | } | |
2e6599cb | 1344 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1345 | fl.oif = sk->sk_bound_dev_if; |
51953d5b | 1346 | fl.mark = sk->sk_mark; |
2e6599cb | 1347 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
fd507037 | 1348 | fl.fl_ip_sport = inet_rsk(req)->loc_port; |
4237c75c | 1349 | security_req_classify_flow(req, &fl); |
1da177e4 LT |
1350 | |
1351 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1352 | goto out; | |
1353 | ||
1354 | if (final_p) | |
1355 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1356 | ||
52479b62 | 1357 | if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) |
1da177e4 | 1358 | goto out; |
1ab1457c | 1359 | } |
1da177e4 LT |
1360 | |
1361 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1362 | if (newsk == NULL) | |
1363 | goto out; | |
1364 | ||
e6848976 ACM |
1365 | /* |
1366 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1367 | * count here, tcp_create_openreq_child now does this for us, see the | |
1368 | * comment in that function for the gory details. -acme | |
1369 | */ | |
1da177e4 | 1370 | |
59eed279 | 1371 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1372 | __ip6_dst_store(newsk, dst, NULL, NULL); |
1da177e4 LT |
1373 | |
1374 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1375 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1376 | ||
1377 | newtp = tcp_sk(newsk); | |
1378 | newinet = inet_sk(newsk); | |
1379 | newnp = inet6_sk(newsk); | |
1380 | ||
1381 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1382 | ||
2e6599cb ACM |
1383 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1384 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1385 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1386 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 | 1387 | |
1ab1457c | 1388 | /* Now IPv6 options... |
1da177e4 LT |
1389 | |
1390 | First: no IPv4 options. | |
1391 | */ | |
1392 | newinet->opt = NULL; | |
d35690be | 1393 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1394 | |
1395 | /* Clone RX bits */ | |
1396 | newnp->rxopt.all = np->rxopt.all; | |
1397 | ||
1398 | /* Clone pktoptions received with SYN */ | |
1399 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1400 | if (treq->pktopts != NULL) { |
1401 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1402 | kfree_skb(treq->pktopts); | |
1403 | treq->pktopts = NULL; | |
1da177e4 LT |
1404 | if (newnp->pktoptions) |
1405 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1406 | } | |
1407 | newnp->opt = NULL; | |
505cbfc5 | 1408 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1409 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
1410 | |
1411 | /* Clone native IPv6 options from listening socket (if any) | |
1412 | ||
1413 | Yes, keeping reference count would be much more clever, | |
1414 | but we make one more one thing there: reattach optmem | |
1415 | to newsk. | |
1416 | */ | |
1417 | if (opt) { | |
1418 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1419 | if (opt != np->opt) | |
1420 | sock_kfree_s(sk, opt, opt->tot_len); | |
1421 | } | |
1422 | ||
d83d8461 | 1423 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1424 | if (newnp->opt) |
d83d8461 ACM |
1425 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1426 | newnp->opt->opt_flen); | |
1da177e4 | 1427 | |
5d424d5a | 1428 | tcp_mtup_init(newsk); |
1da177e4 LT |
1429 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1430 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1431 | tcp_initialize_rcv_mss(newsk); | |
1432 | ||
c720c7e8 ED |
1433 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1434 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1435 | |
cfb6eeb4 YH |
1436 | #ifdef CONFIG_TCP_MD5SIG |
1437 | /* Copy over the MD5 key from the original socket */ | |
1438 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1439 | /* We're using one, so create a matching key | |
1440 | * on the newsk structure. If we fail to get | |
1441 | * memory, then we end up not copying the key | |
1442 | * across. Shucks. | |
1443 | */ | |
af879cc7 ACM |
1444 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1445 | if (newkey != NULL) | |
e547bc1e | 1446 | tcp_v6_md5_do_add(newsk, &newnp->daddr, |
cfb6eeb4 | 1447 | newkey, key->keylen); |
cfb6eeb4 YH |
1448 | } |
1449 | #endif | |
1450 | ||
ab1e0a13 | 1451 | __inet6_hash(newsk); |
e56d8b8a | 1452 | __inet_inherit_port(sk, newsk); |
1da177e4 LT |
1453 | |
1454 | return newsk; | |
1455 | ||
1456 | out_overflow: | |
de0744af | 1457 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
1da177e4 | 1458 | out: |
de0744af | 1459 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1460 | if (opt && opt != np->opt) |
1461 | sock_kfree_s(sk, opt, opt->tot_len); | |
1462 | dst_release(dst); | |
1463 | return NULL; | |
1464 | } | |
1465 | ||
b51655b9 | 1466 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1467 | { |
84fa7933 | 1468 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
684f2176 | 1469 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1470 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1471 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1472 | return 0; |
fb286bb2 | 1473 | } |
1da177e4 | 1474 | } |
fb286bb2 | 1475 | |
684f2176 | 1476 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
0660e03f ACM |
1477 | &ipv6_hdr(skb)->saddr, |
1478 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1479 | |
1da177e4 | 1480 | if (skb->len <= 76) { |
fb286bb2 | 1481 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1482 | } |
1483 | return 0; | |
1484 | } | |
1485 | ||
1486 | /* The socket must have it's spinlock held when we get | |
1487 | * here. | |
1488 | * | |
1489 | * We have a potential double-lock case here, so even when | |
1490 | * doing backlog processing we use the BH locking scheme. | |
1491 | * This is because we cannot sleep with the original spinlock | |
1492 | * held. | |
1493 | */ | |
1494 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1495 | { | |
1496 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1497 | struct tcp_sock *tp; | |
1498 | struct sk_buff *opt_skb = NULL; | |
1499 | ||
1500 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1501 | goes to IPv4 receive handler and backlogged. | |
1502 | From backlog it always goes here. Kerboom... | |
1503 | Fortunately, tcp_rcv_established and rcv_established | |
1504 | handle them correctly, but it is not case with | |
1505 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1506 | */ | |
1507 | ||
1508 | if (skb->protocol == htons(ETH_P_IP)) | |
1509 | return tcp_v4_do_rcv(sk, skb); | |
1510 | ||
cfb6eeb4 YH |
1511 | #ifdef CONFIG_TCP_MD5SIG |
1512 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1513 | goto discard; | |
1514 | #endif | |
1515 | ||
fda9ef5d | 1516 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1517 | goto discard; |
1518 | ||
1519 | /* | |
1520 | * socket locking is here for SMP purposes as backlog rcv | |
1521 | * is currently called with bh processing disabled. | |
1522 | */ | |
1523 | ||
1524 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1525 | ||
1526 | Yes, guys, it is the only place in our code, where we | |
1527 | may make it not affecting IPv4. | |
1528 | The rest of code is protocol independent, | |
1529 | and I do not like idea to uglify IPv4. | |
1530 | ||
1531 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1532 | looks not very well thought. For now we latch | |
1533 | options, received in the last packet, enqueued | |
1534 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1535 | --ANK (980728) |
1da177e4 LT |
1536 | */ |
1537 | if (np->rxopt.all) | |
1538 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1539 | ||
1540 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1541 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1542 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1543 | goto reset; |
1544 | TCP_CHECK_TIMER(sk); | |
1545 | if (opt_skb) | |
1546 | goto ipv6_pktoptions; | |
1547 | return 0; | |
1548 | } | |
1549 | ||
ab6a5bb6 | 1550 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1551 | goto csum_err; |
1552 | ||
1ab1457c | 1553 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1554 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1555 | if (!nsk) | |
1556 | goto discard; | |
1557 | ||
1558 | /* | |
1559 | * Queue it on the new socket if the new socket is active, | |
1560 | * otherwise we just shortcircuit this and continue with | |
1561 | * the new socket.. | |
1562 | */ | |
1ab1457c | 1563 | if(nsk != sk) { |
1da177e4 LT |
1564 | if (tcp_child_process(sk, nsk, skb)) |
1565 | goto reset; | |
1566 | if (opt_skb) | |
1567 | __kfree_skb(opt_skb); | |
1568 | return 0; | |
1569 | } | |
1570 | } | |
1571 | ||
1572 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1573 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1574 | goto reset; |
1575 | TCP_CHECK_TIMER(sk); | |
1576 | if (opt_skb) | |
1577 | goto ipv6_pktoptions; | |
1578 | return 0; | |
1579 | ||
1580 | reset: | |
cfb6eeb4 | 1581 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1582 | discard: |
1583 | if (opt_skb) | |
1584 | __kfree_skb(opt_skb); | |
1585 | kfree_skb(skb); | |
1586 | return 0; | |
1587 | csum_err: | |
63231bdd | 1588 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1589 | goto discard; |
1590 | ||
1591 | ||
1592 | ipv6_pktoptions: | |
1593 | /* Do you ask, what is it? | |
1594 | ||
1595 | 1. skb was enqueued by tcp. | |
1596 | 2. skb is added to tail of read queue, rather than out of order. | |
1597 | 3. socket is not in passive state. | |
1598 | 4. Finally, it really contains options, which user wants to receive. | |
1599 | */ | |
1600 | tp = tcp_sk(sk); | |
1601 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1602 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1603 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1604 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1605 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1606 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
1da177e4 LT |
1607 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1608 | skb_set_owner_r(opt_skb, sk); | |
1609 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1610 | } else { | |
1611 | __kfree_skb(opt_skb); | |
1612 | opt_skb = xchg(&np->pktoptions, NULL); | |
1613 | } | |
1614 | } | |
1615 | ||
800d55f1 | 1616 | kfree_skb(opt_skb); |
1da177e4 LT |
1617 | return 0; |
1618 | } | |
1619 | ||
e5bbef20 | 1620 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1621 | { |
1ab1457c | 1622 | struct tcphdr *th; |
1da177e4 LT |
1623 | struct sock *sk; |
1624 | int ret; | |
a86b1e30 | 1625 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1626 | |
1627 | if (skb->pkt_type != PACKET_HOST) | |
1628 | goto discard_it; | |
1629 | ||
1630 | /* | |
1631 | * Count it even if it's bad. | |
1632 | */ | |
63231bdd | 1633 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1634 | |
1635 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1636 | goto discard_it; | |
1637 | ||
aa8223c7 | 1638 | th = tcp_hdr(skb); |
1da177e4 LT |
1639 | |
1640 | if (th->doff < sizeof(struct tcphdr)/4) | |
1641 | goto bad_packet; | |
1642 | if (!pskb_may_pull(skb, th->doff*4)) | |
1643 | goto discard_it; | |
1644 | ||
60476372 | 1645 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1da177e4 LT |
1646 | goto bad_packet; |
1647 | ||
aa8223c7 | 1648 | th = tcp_hdr(skb); |
1da177e4 LT |
1649 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1650 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1651 | skb->len - th->doff*4); | |
1652 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1653 | TCP_SKB_CB(skb)->when = 0; | |
0660e03f | 1654 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 LT |
1655 | TCP_SKB_CB(skb)->sacked = 0; |
1656 | ||
9a1f27c4 | 1657 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1658 | if (!sk) |
1659 | goto no_tcp_socket; | |
1660 | ||
1661 | process: | |
1662 | if (sk->sk_state == TCP_TIME_WAIT) | |
1663 | goto do_time_wait; | |
1664 | ||
1665 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1666 | goto discard_and_relse; | |
1667 | ||
fda9ef5d | 1668 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1669 | goto discard_and_relse; |
1670 | ||
1671 | skb->dev = NULL; | |
1672 | ||
293b9c42 | 1673 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1674 | ret = 0; |
1675 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1676 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1677 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a | 1678 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
f67b4599 | 1679 | tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY); |
1ab1457c YH |
1680 | if (tp->ucopy.dma_chan) |
1681 | ret = tcp_v6_do_rcv(sk, skb); | |
1682 | else | |
1a2449a8 CL |
1683 | #endif |
1684 | { | |
1685 | if (!tcp_prequeue(sk, skb)) | |
1686 | ret = tcp_v6_do_rcv(sk, skb); | |
1687 | } | |
1da177e4 LT |
1688 | } else |
1689 | sk_add_backlog(sk, skb); | |
1690 | bh_unlock_sock(sk); | |
1691 | ||
1692 | sock_put(sk); | |
1693 | return ret ? -1 : 0; | |
1694 | ||
1695 | no_tcp_socket: | |
1696 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1697 | goto discard_it; | |
1698 | ||
1699 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1700 | bad_packet: | |
63231bdd | 1701 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1702 | } else { |
cfb6eeb4 | 1703 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1704 | } |
1705 | ||
1706 | discard_it: | |
1707 | ||
1708 | /* | |
1709 | * Discard frame | |
1710 | */ | |
1711 | ||
1712 | kfree_skb(skb); | |
1713 | return 0; | |
1714 | ||
1715 | discard_and_relse: | |
1716 | sock_put(sk); | |
1717 | goto discard_it; | |
1718 | ||
1719 | do_time_wait: | |
1720 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1721 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1722 | goto discard_it; |
1723 | } | |
1724 | ||
1725 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
63231bdd | 1726 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
9469c7b4 | 1727 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1728 | goto discard_it; |
1729 | } | |
1730 | ||
9469c7b4 | 1731 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1732 | case TCP_TW_SYN: |
1733 | { | |
1734 | struct sock *sk2; | |
1735 | ||
c346dca1 | 1736 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
0660e03f | 1737 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1738 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1739 | if (sk2 != NULL) { |
295ff7ed ACM |
1740 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1741 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1742 | inet_twsk_put(tw); | |
1da177e4 LT |
1743 | sk = sk2; |
1744 | goto process; | |
1745 | } | |
1746 | /* Fall through to ACK */ | |
1747 | } | |
1748 | case TCP_TW_ACK: | |
1749 | tcp_v6_timewait_ack(sk, skb); | |
1750 | break; | |
1751 | case TCP_TW_RST: | |
1752 | goto no_tcp_socket; | |
1753 | case TCP_TW_SUCCESS:; | |
1754 | } | |
1755 | goto discard_it; | |
1756 | } | |
1757 | ||
1da177e4 LT |
1758 | static int tcp_v6_remember_stamp(struct sock *sk) |
1759 | { | |
1760 | /* Alas, not yet... */ | |
1761 | return 0; | |
1762 | } | |
1763 | ||
3b401a81 | 1764 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1765 | .queue_xmit = inet6_csk_xmit, |
1766 | .send_check = tcp_v6_send_check, | |
1767 | .rebuild_header = inet6_sk_rebuild_header, | |
1768 | .conn_request = tcp_v6_conn_request, | |
1769 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1770 | .remember_stamp = tcp_v6_remember_stamp, | |
1771 | .net_header_len = sizeof(struct ipv6hdr), | |
1772 | .setsockopt = ipv6_setsockopt, | |
1773 | .getsockopt = ipv6_getsockopt, | |
1774 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1775 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1776 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1777 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1778 | .compat_setsockopt = compat_ipv6_setsockopt, |
1779 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1780 | #endif |
1da177e4 LT |
1781 | }; |
1782 | ||
cfb6eeb4 | 1783 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1784 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1785 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1786 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 YH |
1787 | .md5_add = tcp_v6_md5_add_func, |
1788 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1789 | }; |
a928630a | 1790 | #endif |
cfb6eeb4 | 1791 | |
1da177e4 LT |
1792 | /* |
1793 | * TCP over IPv4 via INET6 API | |
1794 | */ | |
1795 | ||
3b401a81 | 1796 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1797 | .queue_xmit = ip_queue_xmit, |
1798 | .send_check = tcp_v4_send_check, | |
1799 | .rebuild_header = inet_sk_rebuild_header, | |
1800 | .conn_request = tcp_v6_conn_request, | |
1801 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1802 | .remember_stamp = tcp_v4_remember_stamp, | |
1803 | .net_header_len = sizeof(struct iphdr), | |
1804 | .setsockopt = ipv6_setsockopt, | |
1805 | .getsockopt = ipv6_getsockopt, | |
1806 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1807 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1808 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1809 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1810 | .compat_setsockopt = compat_ipv6_setsockopt, |
1811 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1812 | #endif |
1da177e4 LT |
1813 | }; |
1814 | ||
cfb6eeb4 | 1815 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1816 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1817 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1818 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 YH |
1819 | .md5_add = tcp_v6_md5_add_func, |
1820 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1821 | }; |
a928630a | 1822 | #endif |
cfb6eeb4 | 1823 | |
1da177e4 LT |
1824 | /* NOTE: A lot of things set to zero explicitly by call to |
1825 | * sk_alloc() so need not be done here. | |
1826 | */ | |
1827 | static int tcp_v6_init_sock(struct sock *sk) | |
1828 | { | |
6687e988 | 1829 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1830 | struct tcp_sock *tp = tcp_sk(sk); |
1831 | ||
1832 | skb_queue_head_init(&tp->out_of_order_queue); | |
1833 | tcp_init_xmit_timers(sk); | |
1834 | tcp_prequeue_init(tp); | |
1835 | ||
6687e988 | 1836 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1837 | tp->mdev = TCP_TIMEOUT_INIT; |
1838 | ||
1839 | /* So many TCP implementations out there (incorrectly) count the | |
1840 | * initial SYN frame in their delayed-ACK and congestion control | |
1841 | * algorithms that we must have the following bandaid to talk | |
1842 | * efficiently to them. -DaveM | |
1843 | */ | |
1844 | tp->snd_cwnd = 2; | |
1845 | ||
1846 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1847 | * initialization of these values. | |
1848 | */ | |
0b6a05c1 | 1849 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; |
1da177e4 | 1850 | tp->snd_cwnd_clamp = ~0; |
bee7ca9e | 1851 | tp->mss_cache = TCP_MSS_DEFAULT; |
1da177e4 LT |
1852 | |
1853 | tp->reordering = sysctl_tcp_reordering; | |
1854 | ||
1855 | sk->sk_state = TCP_CLOSE; | |
1856 | ||
8292a17a | 1857 | icsk->icsk_af_ops = &ipv6_specific; |
6687e988 | 1858 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
d83d8461 | 1859 | icsk->icsk_sync_mss = tcp_sync_mss; |
1da177e4 LT |
1860 | sk->sk_write_space = sk_stream_write_space; |
1861 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1862 | ||
cfb6eeb4 YH |
1863 | #ifdef CONFIG_TCP_MD5SIG |
1864 | tp->af_specific = &tcp_sock_ipv6_specific; | |
1865 | #endif | |
1866 | ||
435cf559 WAS |
1867 | /* TCP Cookie Transactions */ |
1868 | if (sysctl_tcp_cookie_size > 0) { | |
1869 | /* Default, cookies without s_data_payload. */ | |
1870 | tp->cookie_values = | |
1871 | kzalloc(sizeof(*tp->cookie_values), | |
1872 | sk->sk_allocation); | |
1873 | if (tp->cookie_values != NULL) | |
1874 | kref_init(&tp->cookie_values->kref); | |
1875 | } | |
1876 | /* Presumed zeroed, in order of appearance: | |
1877 | * cookie_in_always, cookie_out_never, | |
1878 | * s_data_constant, s_data_in, s_data_out | |
1879 | */ | |
1da177e4 LT |
1880 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
1881 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1882 | ||
eb4dea58 | 1883 | local_bh_disable(); |
1748376b | 1884 | percpu_counter_inc(&tcp_sockets_allocated); |
eb4dea58 | 1885 | local_bh_enable(); |
1da177e4 LT |
1886 | |
1887 | return 0; | |
1888 | } | |
1889 | ||
7d06b2e0 | 1890 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1891 | { |
cfb6eeb4 YH |
1892 | #ifdef CONFIG_TCP_MD5SIG |
1893 | /* Clean up the MD5 key list */ | |
1894 | if (tcp_sk(sk)->md5sig_info) | |
1895 | tcp_v6_clear_md5_list(sk); | |
1896 | #endif | |
1da177e4 | 1897 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1898 | inet6_destroy_sock(sk); |
1da177e4 LT |
1899 | } |
1900 | ||
952a10be | 1901 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1902 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1903 | static void get_openreq6(struct seq_file *seq, |
60236fdd | 1904 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 1905 | { |
1da177e4 | 1906 | int ttd = req->expires - jiffies; |
ca304b61 ACM |
1907 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1908 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1909 | |
1910 | if (ttd < 0) | |
1911 | ttd = 0; | |
1912 | ||
1da177e4 LT |
1913 | seq_printf(seq, |
1914 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1915 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1916 | i, | |
1917 | src->s6_addr32[0], src->s6_addr32[1], | |
1918 | src->s6_addr32[2], src->s6_addr32[3], | |
fd507037 | 1919 | ntohs(inet_rsk(req)->loc_port), |
1da177e4 LT |
1920 | dest->s6_addr32[0], dest->s6_addr32[1], |
1921 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1922 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1923 | TCP_SYN_RECV, |
1924 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
1925 | 1, /* timers active (only the expire timer) */ |
1926 | jiffies_to_clock_t(ttd), | |
1da177e4 LT |
1927 | req->retrans, |
1928 | uid, | |
1ab1457c | 1929 | 0, /* non standard timer */ |
1da177e4 LT |
1930 | 0, /* open_requests have no inode */ |
1931 | 0, req); | |
1932 | } | |
1933 | ||
1934 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1935 | { | |
1936 | struct in6_addr *dest, *src; | |
1937 | __u16 destp, srcp; | |
1938 | int timer_active; | |
1939 | unsigned long timer_expires; | |
1940 | struct inet_sock *inet = inet_sk(sp); | |
1941 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1942 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
1943 | struct ipv6_pinfo *np = inet6_sk(sp); |
1944 | ||
1945 | dest = &np->daddr; | |
1946 | src = &np->rcv_saddr; | |
c720c7e8 ED |
1947 | destp = ntohs(inet->inet_dport); |
1948 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
1949 | |
1950 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1951 | timer_active = 1; |
463c84b9 ACM |
1952 | timer_expires = icsk->icsk_timeout; |
1953 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1954 | timer_active = 4; |
463c84b9 | 1955 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1956 | } else if (timer_pending(&sp->sk_timer)) { |
1957 | timer_active = 2; | |
1958 | timer_expires = sp->sk_timer.expires; | |
1959 | } else { | |
1960 | timer_active = 0; | |
1961 | timer_expires = jiffies; | |
1962 | } | |
1963 | ||
1964 | seq_printf(seq, | |
1965 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
7be87351 | 1966 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n", |
1da177e4 LT |
1967 | i, |
1968 | src->s6_addr32[0], src->s6_addr32[1], | |
1969 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1970 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1971 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1972 | sp->sk_state, |
47da8ee6 SS |
1973 | tp->write_seq-tp->snd_una, |
1974 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 LT |
1975 | timer_active, |
1976 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 1977 | icsk->icsk_retransmits, |
1da177e4 | 1978 | sock_i_uid(sp), |
6687e988 | 1979 | icsk->icsk_probes_out, |
1da177e4 LT |
1980 | sock_i_ino(sp), |
1981 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1982 | jiffies_to_clock_t(icsk->icsk_rto), |
1983 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 1984 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
0b6a05c1 IJ |
1985 | tp->snd_cwnd, |
1986 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh | |
1da177e4 LT |
1987 | ); |
1988 | } | |
1989 | ||
1ab1457c | 1990 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1991 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
1992 | { |
1993 | struct in6_addr *dest, *src; | |
1994 | __u16 destp, srcp; | |
0fa1a53e | 1995 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
1996 | int ttd = tw->tw_ttd - jiffies; |
1997 | ||
1998 | if (ttd < 0) | |
1999 | ttd = 0; | |
2000 | ||
0fa1a53e ACM |
2001 | dest = &tw6->tw_v6_daddr; |
2002 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
2003 | destp = ntohs(tw->tw_dport); |
2004 | srcp = ntohs(tw->tw_sport); | |
2005 | ||
2006 | seq_printf(seq, | |
2007 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2008 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
2009 | i, | |
2010 | src->s6_addr32[0], src->s6_addr32[1], | |
2011 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2012 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2013 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2014 | tw->tw_substate, 0, 0, | |
2015 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2016 | atomic_read(&tw->tw_refcnt), tw); | |
2017 | } | |
2018 | ||
1da177e4 LT |
2019 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
2020 | { | |
2021 | struct tcp_iter_state *st; | |
2022 | ||
2023 | if (v == SEQ_START_TOKEN) { | |
2024 | seq_puts(seq, | |
2025 | " sl " | |
2026 | "local_address " | |
2027 | "remote_address " | |
2028 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2029 | " uid timeout inode\n"); | |
2030 | goto out; | |
2031 | } | |
2032 | st = seq->private; | |
2033 | ||
2034 | switch (st->state) { | |
2035 | case TCP_SEQ_STATE_LISTENING: | |
2036 | case TCP_SEQ_STATE_ESTABLISHED: | |
2037 | get_tcp6_sock(seq, v, st->num); | |
2038 | break; | |
2039 | case TCP_SEQ_STATE_OPENREQ: | |
2040 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
2041 | break; | |
2042 | case TCP_SEQ_STATE_TIME_WAIT: | |
2043 | get_timewait6_sock(seq, v, st->num); | |
2044 | break; | |
2045 | } | |
2046 | out: | |
2047 | return 0; | |
2048 | } | |
2049 | ||
1da177e4 | 2050 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
2051 | .name = "tcp6", |
2052 | .family = AF_INET6, | |
5f4472c5 DL |
2053 | .seq_fops = { |
2054 | .owner = THIS_MODULE, | |
2055 | }, | |
9427c4b3 DL |
2056 | .seq_ops = { |
2057 | .show = tcp6_seq_show, | |
2058 | }, | |
1da177e4 LT |
2059 | }; |
2060 | ||
6f8b13bc | 2061 | int tcp6_proc_init(struct net *net) |
1da177e4 | 2062 | { |
6f8b13bc | 2063 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2064 | } |
2065 | ||
6f8b13bc | 2066 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2067 | { |
6f8b13bc | 2068 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2069 | } |
2070 | #endif | |
2071 | ||
2072 | struct proto tcpv6_prot = { | |
2073 | .name = "TCPv6", | |
2074 | .owner = THIS_MODULE, | |
2075 | .close = tcp_close, | |
2076 | .connect = tcp_v6_connect, | |
2077 | .disconnect = tcp_disconnect, | |
463c84b9 | 2078 | .accept = inet_csk_accept, |
1da177e4 LT |
2079 | .ioctl = tcp_ioctl, |
2080 | .init = tcp_v6_init_sock, | |
2081 | .destroy = tcp_v6_destroy_sock, | |
2082 | .shutdown = tcp_shutdown, | |
2083 | .setsockopt = tcp_setsockopt, | |
2084 | .getsockopt = tcp_getsockopt, | |
1da177e4 LT |
2085 | .recvmsg = tcp_recvmsg, |
2086 | .backlog_rcv = tcp_v6_do_rcv, | |
2087 | .hash = tcp_v6_hash, | |
ab1e0a13 ACM |
2088 | .unhash = inet_unhash, |
2089 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2090 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2091 | .sockets_allocated = &tcp_sockets_allocated, | |
2092 | .memory_allocated = &tcp_memory_allocated, | |
2093 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2094 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2095 | .sysctl_mem = sysctl_tcp_mem, |
2096 | .sysctl_wmem = sysctl_tcp_wmem, | |
2097 | .sysctl_rmem = sysctl_tcp_rmem, | |
2098 | .max_header = MAX_TCP_HEADER, | |
2099 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 2100 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 2101 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2102 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2103 | .h.hashinfo = &tcp_hashinfo, |
543d9cfe ACM |
2104 | #ifdef CONFIG_COMPAT |
2105 | .compat_setsockopt = compat_tcp_setsockopt, | |
2106 | .compat_getsockopt = compat_tcp_getsockopt, | |
2107 | #endif | |
1da177e4 LT |
2108 | }; |
2109 | ||
41135cc8 | 2110 | static const struct inet6_protocol tcpv6_protocol = { |
1da177e4 LT |
2111 | .handler = tcp_v6_rcv, |
2112 | .err_handler = tcp_v6_err, | |
a430a43d | 2113 | .gso_send_check = tcp_v6_gso_send_check, |
adcfc7d0 | 2114 | .gso_segment = tcp_tso_segment, |
684f2176 HX |
2115 | .gro_receive = tcp6_gro_receive, |
2116 | .gro_complete = tcp6_gro_complete, | |
1da177e4 LT |
2117 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
2118 | }; | |
2119 | ||
1da177e4 LT |
2120 | static struct inet_protosw tcpv6_protosw = { |
2121 | .type = SOCK_STREAM, | |
2122 | .protocol = IPPROTO_TCP, | |
2123 | .prot = &tcpv6_prot, | |
2124 | .ops = &inet6_stream_ops, | |
1da177e4 | 2125 | .no_check = 0, |
d83d8461 ACM |
2126 | .flags = INET_PROTOSW_PERMANENT | |
2127 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2128 | }; |
2129 | ||
93ec926b DL |
2130 | static int tcpv6_net_init(struct net *net) |
2131 | { | |
5677242f DL |
2132 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2133 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2134 | } |
2135 | ||
2136 | static void tcpv6_net_exit(struct net *net) | |
2137 | { | |
5677242f | 2138 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
d315492b | 2139 | inet_twsk_purge(net, &tcp_hashinfo, &tcp_death_row, AF_INET6); |
93ec926b DL |
2140 | } |
2141 | ||
2142 | static struct pernet_operations tcpv6_net_ops = { | |
2143 | .init = tcpv6_net_init, | |
2144 | .exit = tcpv6_net_exit, | |
2145 | }; | |
2146 | ||
7f4e4868 | 2147 | int __init tcpv6_init(void) |
1da177e4 | 2148 | { |
7f4e4868 DL |
2149 | int ret; |
2150 | ||
2151 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2152 | if (ret) | |
2153 | goto out; | |
2154 | ||
1da177e4 | 2155 | /* register inet6 protocol */ |
7f4e4868 DL |
2156 | ret = inet6_register_protosw(&tcpv6_protosw); |
2157 | if (ret) | |
2158 | goto out_tcpv6_protocol; | |
2159 | ||
93ec926b | 2160 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2161 | if (ret) |
2162 | goto out_tcpv6_protosw; | |
2163 | out: | |
2164 | return ret; | |
ae0f7d5f | 2165 | |
7f4e4868 DL |
2166 | out_tcpv6_protocol: |
2167 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2168 | out_tcpv6_protosw: | |
2169 | inet6_unregister_protosw(&tcpv6_protosw); | |
2170 | goto out; | |
2171 | } | |
2172 | ||
09f7709f | 2173 | void tcpv6_exit(void) |
7f4e4868 | 2174 | { |
93ec926b | 2175 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2176 | inet6_unregister_protosw(&tcpv6_protosw); |
2177 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2178 | } |