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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 | ||
fd80eb94 | 464 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req) |
1da177e4 | 465 | { |
ca304b61 | 466 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
467 | struct ipv6_pinfo *np = inet6_sk(sk); |
468 | struct sk_buff * skb; | |
469 | struct ipv6_txoptions *opt = NULL; | |
470 | struct in6_addr * final_p = NULL, final; | |
471 | struct flowi fl; | |
fd80eb94 | 472 | struct dst_entry *dst; |
1da177e4 LT |
473 | int err = -1; |
474 | ||
475 | memset(&fl, 0, sizeof(fl)); | |
476 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
477 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
478 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 479 | fl.fl6_flowlabel = 0; |
2e6599cb | 480 | fl.oif = treq->iif; |
51953d5b | 481 | fl.mark = sk->sk_mark; |
2e6599cb | 482 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
fd507037 | 483 | fl.fl_ip_sport = inet_rsk(req)->loc_port; |
4237c75c | 484 | security_req_classify_flow(req, &fl); |
1da177e4 | 485 | |
fd80eb94 DL |
486 | opt = np->opt; |
487 | if (opt && opt->srcrt) { | |
488 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
489 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
490 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
491 | final_p = &final; | |
1da177e4 LT |
492 | } |
493 | ||
fd80eb94 DL |
494 | err = ip6_dst_lookup(sk, &dst, &fl); |
495 | if (err) | |
496 | goto done; | |
497 | if (final_p) | |
498 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
52479b62 | 499 | if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) |
fd80eb94 DL |
500 | goto done; |
501 | ||
1da177e4 LT |
502 | skb = tcp_make_synack(sk, dst, req); |
503 | if (skb) { | |
aa8223c7 | 504 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 505 | |
684f2176 | 506 | th->check = tcp_v6_check(skb->len, |
2e6599cb | 507 | &treq->loc_addr, &treq->rmt_addr, |
07f0757a | 508 | csum_partial(th, skb->len, skb->csum)); |
1da177e4 | 509 | |
2e6599cb | 510 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 | 511 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
b9df3cb8 | 512 | err = net_xmit_eval(err); |
1da177e4 LT |
513 | } |
514 | ||
515 | done: | |
1ab1457c | 516 | if (opt && opt != np->opt) |
1da177e4 | 517 | sock_kfree_s(sk, opt, opt->tot_len); |
78b91042 | 518 | dst_release(dst); |
1da177e4 LT |
519 | return err; |
520 | } | |
521 | ||
c6aefafb GG |
522 | static inline void syn_flood_warning(struct sk_buff *skb) |
523 | { | |
524 | #ifdef CONFIG_SYN_COOKIES | |
525 | if (sysctl_tcp_syncookies) | |
526 | printk(KERN_INFO | |
527 | "TCPv6: Possible SYN flooding on port %d. " | |
528 | "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest)); | |
529 | else | |
530 | #endif | |
531 | printk(KERN_INFO | |
532 | "TCPv6: Possible SYN flooding on port %d. " | |
533 | "Dropping request.\n", ntohs(tcp_hdr(skb)->dest)); | |
534 | } | |
535 | ||
60236fdd | 536 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 537 | { |
800d55f1 | 538 | kfree_skb(inet6_rsk(req)->pktopts); |
1da177e4 LT |
539 | } |
540 | ||
cfb6eeb4 YH |
541 | #ifdef CONFIG_TCP_MD5SIG |
542 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
543 | struct in6_addr *addr) | |
544 | { | |
545 | struct tcp_sock *tp = tcp_sk(sk); | |
546 | int i; | |
547 | ||
548 | BUG_ON(tp == NULL); | |
549 | ||
550 | if (!tp->md5sig_info || !tp->md5sig_info->entries6) | |
551 | return NULL; | |
552 | ||
553 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 554 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr)) |
f8ab18d2 | 555 | return &tp->md5sig_info->keys6[i].base; |
cfb6eeb4 YH |
556 | } |
557 | return NULL; | |
558 | } | |
559 | ||
560 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
561 | struct sock *addr_sk) | |
562 | { | |
563 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); | |
564 | } | |
565 | ||
566 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
567 | struct request_sock *req) | |
568 | { | |
569 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
570 | } | |
571 | ||
572 | static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer, | |
573 | char *newkey, u8 newkeylen) | |
574 | { | |
575 | /* Add key to the list */ | |
b0a713e9 | 576 | struct tcp_md5sig_key *key; |
cfb6eeb4 YH |
577 | struct tcp_sock *tp = tcp_sk(sk); |
578 | struct tcp6_md5sig_key *keys; | |
579 | ||
b0a713e9 | 580 | key = tcp_v6_md5_do_lookup(sk, peer); |
cfb6eeb4 YH |
581 | if (key) { |
582 | /* modify existing entry - just update that one */ | |
b0a713e9 MD |
583 | kfree(key->key); |
584 | key->key = newkey; | |
585 | key->keylen = newkeylen; | |
cfb6eeb4 YH |
586 | } else { |
587 | /* reallocate new list if current one is full. */ | |
588 | if (!tp->md5sig_info) { | |
589 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC); | |
590 | if (!tp->md5sig_info) { | |
591 | kfree(newkey); | |
592 | return -ENOMEM; | |
593 | } | |
3d7dbeac | 594 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 | 595 | } |
aa133076 | 596 | if (tcp_alloc_md5sig_pool(sk) == NULL) { |
aacbe8c8 YH |
597 | kfree(newkey); |
598 | return -ENOMEM; | |
599 | } | |
cfb6eeb4 YH |
600 | if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) { |
601 | keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) * | |
602 | (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC); | |
603 | ||
604 | if (!keys) { | |
605 | tcp_free_md5sig_pool(); | |
606 | kfree(newkey); | |
607 | return -ENOMEM; | |
608 | } | |
609 | ||
610 | if (tp->md5sig_info->entries6) | |
611 | memmove(keys, tp->md5sig_info->keys6, | |
612 | (sizeof (tp->md5sig_info->keys6[0]) * | |
613 | tp->md5sig_info->entries6)); | |
614 | ||
615 | kfree(tp->md5sig_info->keys6); | |
616 | tp->md5sig_info->keys6 = keys; | |
617 | tp->md5sig_info->alloced6++; | |
618 | } | |
619 | ||
620 | ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr, | |
621 | peer); | |
f8ab18d2 DM |
622 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey; |
623 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen; | |
cfb6eeb4 YH |
624 | |
625 | tp->md5sig_info->entries6++; | |
626 | } | |
627 | return 0; | |
628 | } | |
629 | ||
630 | static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk, | |
631 | u8 *newkey, __u8 newkeylen) | |
632 | { | |
633 | return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr, | |
634 | newkey, newkeylen); | |
635 | } | |
636 | ||
637 | static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer) | |
638 | { | |
639 | struct tcp_sock *tp = tcp_sk(sk); | |
640 | int i; | |
641 | ||
642 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 643 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) { |
cfb6eeb4 | 644 | /* Free the key */ |
f8ab18d2 | 645 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
646 | tp->md5sig_info->entries6--; |
647 | ||
648 | if (tp->md5sig_info->entries6 == 0) { | |
649 | kfree(tp->md5sig_info->keys6); | |
650 | tp->md5sig_info->keys6 = NULL; | |
ca983cef | 651 | tp->md5sig_info->alloced6 = 0; |
cfb6eeb4 YH |
652 | } else { |
653 | /* shrink the database */ | |
654 | if (tp->md5sig_info->entries6 != i) | |
655 | memmove(&tp->md5sig_info->keys6[i], | |
656 | &tp->md5sig_info->keys6[i+1], | |
657 | (tp->md5sig_info->entries6 - i) | |
658 | * sizeof (tp->md5sig_info->keys6[0])); | |
659 | } | |
77adefdc YH |
660 | tcp_free_md5sig_pool(); |
661 | return 0; | |
cfb6eeb4 YH |
662 | } |
663 | } | |
664 | return -ENOENT; | |
665 | } | |
666 | ||
667 | static void tcp_v6_clear_md5_list (struct sock *sk) | |
668 | { | |
669 | struct tcp_sock *tp = tcp_sk(sk); | |
670 | int i; | |
671 | ||
672 | if (tp->md5sig_info->entries6) { | |
673 | for (i = 0; i < tp->md5sig_info->entries6; i++) | |
f8ab18d2 | 674 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
675 | tp->md5sig_info->entries6 = 0; |
676 | tcp_free_md5sig_pool(); | |
677 | } | |
678 | ||
679 | kfree(tp->md5sig_info->keys6); | |
680 | tp->md5sig_info->keys6 = NULL; | |
681 | tp->md5sig_info->alloced6 = 0; | |
682 | ||
683 | if (tp->md5sig_info->entries4) { | |
684 | for (i = 0; i < tp->md5sig_info->entries4; i++) | |
f8ab18d2 | 685 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
686 | tp->md5sig_info->entries4 = 0; |
687 | tcp_free_md5sig_pool(); | |
688 | } | |
689 | ||
690 | kfree(tp->md5sig_info->keys4); | |
691 | tp->md5sig_info->keys4 = NULL; | |
692 | tp->md5sig_info->alloced4 = 0; | |
693 | } | |
694 | ||
695 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, | |
696 | int optlen) | |
697 | { | |
698 | struct tcp_md5sig cmd; | |
699 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
700 | u8 *newkey; | |
701 | ||
702 | if (optlen < sizeof(cmd)) | |
703 | return -EINVAL; | |
704 | ||
705 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
706 | return -EFAULT; | |
707 | ||
708 | if (sin6->sin6_family != AF_INET6) | |
709 | return -EINVAL; | |
710 | ||
711 | if (!cmd.tcpm_keylen) { | |
712 | if (!tcp_sk(sk)->md5sig_info) | |
713 | return -ENOENT; | |
e773e4fa | 714 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
cfb6eeb4 YH |
715 | return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]); |
716 | return tcp_v6_md5_do_del(sk, &sin6->sin6_addr); | |
717 | } | |
718 | ||
719 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
720 | return -EINVAL; | |
721 | ||
722 | if (!tcp_sk(sk)->md5sig_info) { | |
723 | struct tcp_sock *tp = tcp_sk(sk); | |
724 | struct tcp_md5sig_info *p; | |
725 | ||
726 | p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL); | |
727 | if (!p) | |
728 | return -ENOMEM; | |
729 | ||
730 | tp->md5sig_info = p; | |
3d7dbeac | 731 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 YH |
732 | } |
733 | ||
af879cc7 | 734 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
735 | if (!newkey) |
736 | return -ENOMEM; | |
e773e4fa | 737 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { |
cfb6eeb4 YH |
738 | return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3], |
739 | newkey, cmd.tcpm_keylen); | |
740 | } | |
741 | return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen); | |
742 | } | |
743 | ||
49a72dfb AL |
744 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
745 | struct in6_addr *daddr, | |
746 | struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 747 | { |
cfb6eeb4 | 748 | struct tcp6_pseudohdr *bp; |
49a72dfb | 749 | struct scatterlist sg; |
8d26d76d | 750 | |
cfb6eeb4 | 751 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 YH |
752 | /* 1. TCP pseudo-header (RFC2460) */ |
753 | ipv6_addr_copy(&bp->saddr, saddr); | |
754 | ipv6_addr_copy(&bp->daddr, daddr); | |
49a72dfb | 755 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 756 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 757 | |
49a72dfb AL |
758 | sg_init_one(&sg, bp, sizeof(*bp)); |
759 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
760 | } | |
c7da57a1 | 761 | |
49a72dfb AL |
762 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
763 | struct in6_addr *daddr, struct in6_addr *saddr, | |
764 | struct tcphdr *th) | |
765 | { | |
766 | struct tcp_md5sig_pool *hp; | |
767 | struct hash_desc *desc; | |
768 | ||
769 | hp = tcp_get_md5sig_pool(); | |
770 | if (!hp) | |
771 | goto clear_hash_noput; | |
772 | desc = &hp->md5_desc; | |
773 | ||
774 | if (crypto_hash_init(desc)) | |
775 | goto clear_hash; | |
776 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
777 | goto clear_hash; | |
778 | if (tcp_md5_hash_header(hp, th)) | |
779 | goto clear_hash; | |
780 | if (tcp_md5_hash_key(hp, key)) | |
781 | goto clear_hash; | |
782 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 783 | goto clear_hash; |
cfb6eeb4 | 784 | |
cfb6eeb4 | 785 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 786 | return 0; |
49a72dfb | 787 | |
cfb6eeb4 YH |
788 | clear_hash: |
789 | tcp_put_md5sig_pool(); | |
790 | clear_hash_noput: | |
791 | memset(md5_hash, 0, 16); | |
49a72dfb | 792 | return 1; |
cfb6eeb4 YH |
793 | } |
794 | ||
49a72dfb AL |
795 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
796 | struct sock *sk, struct request_sock *req, | |
797 | struct sk_buff *skb) | |
cfb6eeb4 YH |
798 | { |
799 | struct in6_addr *saddr, *daddr; | |
49a72dfb AL |
800 | struct tcp_md5sig_pool *hp; |
801 | struct hash_desc *desc; | |
802 | struct tcphdr *th = tcp_hdr(skb); | |
cfb6eeb4 YH |
803 | |
804 | if (sk) { | |
805 | saddr = &inet6_sk(sk)->saddr; | |
806 | daddr = &inet6_sk(sk)->daddr; | |
49a72dfb | 807 | } else if (req) { |
cfb6eeb4 YH |
808 | saddr = &inet6_rsk(req)->loc_addr; |
809 | daddr = &inet6_rsk(req)->rmt_addr; | |
49a72dfb AL |
810 | } else { |
811 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
812 | saddr = &ip6h->saddr; | |
813 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 814 | } |
49a72dfb AL |
815 | |
816 | hp = tcp_get_md5sig_pool(); | |
817 | if (!hp) | |
818 | goto clear_hash_noput; | |
819 | desc = &hp->md5_desc; | |
820 | ||
821 | if (crypto_hash_init(desc)) | |
822 | goto clear_hash; | |
823 | ||
824 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
825 | goto clear_hash; | |
826 | if (tcp_md5_hash_header(hp, th)) | |
827 | goto clear_hash; | |
828 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
829 | goto clear_hash; | |
830 | if (tcp_md5_hash_key(hp, key)) | |
831 | goto clear_hash; | |
832 | if (crypto_hash_final(desc, md5_hash)) | |
833 | goto clear_hash; | |
834 | ||
835 | tcp_put_md5sig_pool(); | |
836 | return 0; | |
837 | ||
838 | clear_hash: | |
839 | tcp_put_md5sig_pool(); | |
840 | clear_hash_noput: | |
841 | memset(md5_hash, 0, 16); | |
842 | return 1; | |
cfb6eeb4 YH |
843 | } |
844 | ||
845 | static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb) | |
846 | { | |
847 | __u8 *hash_location = NULL; | |
848 | struct tcp_md5sig_key *hash_expected; | |
0660e03f | 849 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
aa8223c7 | 850 | struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 851 | int genhash; |
cfb6eeb4 YH |
852 | u8 newhash[16]; |
853 | ||
854 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 855 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 856 | |
785957d3 DM |
857 | /* We've parsed the options - do we have a hash? */ |
858 | if (!hash_expected && !hash_location) | |
859 | return 0; | |
860 | ||
861 | if (hash_expected && !hash_location) { | |
862 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
863 | return 1; |
864 | } | |
865 | ||
785957d3 DM |
866 | if (!hash_expected && hash_location) { |
867 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
868 | return 1; |
869 | } | |
870 | ||
871 | /* check the signature */ | |
49a72dfb AL |
872 | genhash = tcp_v6_md5_hash_skb(newhash, |
873 | hash_expected, | |
874 | NULL, NULL, skb); | |
875 | ||
cfb6eeb4 YH |
876 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
877 | if (net_ratelimit()) { | |
5b095d98 | 878 | printk(KERN_INFO "MD5 Hash %s for (%pI6, %u)->(%pI6, %u)\n", |
cfb6eeb4 | 879 | genhash ? "failed" : "mismatch", |
0c6ce78a HH |
880 | &ip6h->saddr, ntohs(th->source), |
881 | &ip6h->daddr, ntohs(th->dest)); | |
cfb6eeb4 YH |
882 | } |
883 | return 1; | |
884 | } | |
885 | return 0; | |
886 | } | |
887 | #endif | |
888 | ||
c6aefafb | 889 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 890 | .family = AF_INET6, |
2e6599cb | 891 | .obj_size = sizeof(struct tcp6_request_sock), |
1da177e4 | 892 | .rtx_syn_ack = tcp_v6_send_synack, |
60236fdd ACM |
893 | .send_ack = tcp_v6_reqsk_send_ack, |
894 | .destructor = tcp_v6_reqsk_destructor, | |
1da177e4 LT |
895 | .send_reset = tcp_v6_send_reset |
896 | }; | |
897 | ||
cfb6eeb4 | 898 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 899 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 900 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 901 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 902 | }; |
b6332e6c | 903 | #endif |
cfb6eeb4 | 904 | |
6d6ee43e ACM |
905 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
906 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
907 | .twsk_unique = tcp_twsk_unique, | |
cfb6eeb4 | 908 | .twsk_destructor= tcp_twsk_destructor, |
6d6ee43e ACM |
909 | }; |
910 | ||
8292a17a | 911 | static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) |
1da177e4 LT |
912 | { |
913 | struct ipv6_pinfo *np = inet6_sk(sk); | |
aa8223c7 | 914 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 915 | |
84fa7933 | 916 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1da177e4 | 917 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); |
663ead3b | 918 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 919 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 920 | } else { |
1ab1457c | 921 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, |
07f0757a | 922 | csum_partial(th, th->doff<<2, |
1da177e4 LT |
923 | skb->csum)); |
924 | } | |
925 | } | |
926 | ||
a430a43d HX |
927 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
928 | { | |
929 | struct ipv6hdr *ipv6h; | |
930 | struct tcphdr *th; | |
931 | ||
932 | if (!pskb_may_pull(skb, sizeof(*th))) | |
933 | return -EINVAL; | |
934 | ||
0660e03f | 935 | ipv6h = ipv6_hdr(skb); |
aa8223c7 | 936 | th = tcp_hdr(skb); |
a430a43d HX |
937 | |
938 | th->check = 0; | |
939 | th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, | |
940 | IPPROTO_TCP, 0); | |
663ead3b | 941 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 942 | skb->csum_offset = offsetof(struct tcphdr, check); |
84fa7933 | 943 | skb->ip_summed = CHECKSUM_PARTIAL; |
a430a43d HX |
944 | return 0; |
945 | } | |
1da177e4 | 946 | |
36990673 HX |
947 | static struct sk_buff **tcp6_gro_receive(struct sk_buff **head, |
948 | struct sk_buff *skb) | |
684f2176 | 949 | { |
36e7b1b8 | 950 | struct ipv6hdr *iph = skb_gro_network_header(skb); |
684f2176 HX |
951 | |
952 | switch (skb->ip_summed) { | |
953 | case CHECKSUM_COMPLETE: | |
86911732 | 954 | if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr, |
684f2176 HX |
955 | skb->csum)) { |
956 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
957 | break; | |
958 | } | |
959 | ||
960 | /* fall through */ | |
961 | case CHECKSUM_NONE: | |
962 | NAPI_GRO_CB(skb)->flush = 1; | |
963 | return NULL; | |
964 | } | |
965 | ||
966 | return tcp_gro_receive(head, skb); | |
967 | } | |
684f2176 | 968 | |
36990673 | 969 | static int tcp6_gro_complete(struct sk_buff *skb) |
684f2176 HX |
970 | { |
971 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
972 | struct tcphdr *th = tcp_hdr(skb); | |
973 | ||
974 | th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb), | |
975 | &iph->saddr, &iph->daddr, 0); | |
976 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
977 | ||
978 | return tcp_gro_complete(skb); | |
979 | } | |
684f2176 | 980 | |
626e264d IJ |
981 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
982 | u32 ts, struct tcp_md5sig_key *key, int rst) | |
1da177e4 | 983 | { |
aa8223c7 | 984 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
985 | struct sk_buff *buff; |
986 | struct flowi fl; | |
adf30907 | 987 | struct net *net = dev_net(skb_dst(skb)->dev); |
e5047992 | 988 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 989 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 990 | struct dst_entry *dst; |
81ada62d | 991 | __be32 *topt; |
1da177e4 | 992 | |
626e264d IJ |
993 | if (ts) |
994 | tot_len += TCPOLEN_TSTAMP_ALIGNED; | |
cfb6eeb4 | 995 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
996 | if (key) |
997 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
998 | #endif | |
999 | ||
cfb6eeb4 | 1000 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 1001 | GFP_ATOMIC); |
1ab1457c YH |
1002 | if (buff == NULL) |
1003 | return; | |
1da177e4 | 1004 | |
cfb6eeb4 | 1005 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 1006 | |
cfb6eeb4 | 1007 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
a8fdf2b3 | 1008 | skb_reset_transport_header(skb); |
1da177e4 LT |
1009 | |
1010 | /* Swap the send and the receive. */ | |
1011 | memset(t1, 0, sizeof(*t1)); | |
1012 | t1->dest = th->source; | |
1013 | t1->source = th->dest; | |
cfb6eeb4 | 1014 | t1->doff = tot_len / 4; |
626e264d IJ |
1015 | t1->seq = htonl(seq); |
1016 | t1->ack_seq = htonl(ack); | |
1017 | t1->ack = !rst || !th->ack; | |
1018 | t1->rst = rst; | |
1019 | t1->window = htons(win); | |
1da177e4 | 1020 | |
81ada62d IJ |
1021 | topt = (__be32 *)(t1 + 1); |
1022 | ||
626e264d IJ |
1023 | if (ts) { |
1024 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
1025 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
1026 | *topt++ = htonl(tcp_time_stamp); | |
1027 | *topt++ = htonl(ts); | |
1028 | } | |
1029 | ||
cfb6eeb4 YH |
1030 | #ifdef CONFIG_TCP_MD5SIG |
1031 | if (key) { | |
81ada62d IJ |
1032 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
1033 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
1034 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
1035 | &ipv6_hdr(skb)->saddr, |
1036 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
1037 | } |
1038 | #endif | |
1039 | ||
07f0757a | 1040 | buff->csum = csum_partial(t1, tot_len, 0); |
1da177e4 LT |
1041 | |
1042 | memset(&fl, 0, sizeof(fl)); | |
0660e03f ACM |
1043 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
1044 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1045 | |
1046 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
52cd5750 | 1047 | tot_len, IPPROTO_TCP, |
1da177e4 LT |
1048 | buff->csum); |
1049 | ||
1050 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 1051 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
1052 | fl.fl_ip_dport = t1->dest; |
1053 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 1054 | security_skb_classify_flow(skb, &fl); |
1da177e4 | 1055 | |
c20121ae DL |
1056 | /* Pass a socket to ip6_dst_lookup either it is for RST |
1057 | * Underlying function will use this to retrieve the network | |
1058 | * namespace | |
1059 | */ | |
adf30907 ED |
1060 | if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) { |
1061 | if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) { | |
1062 | skb_dst_set(buff, dst); | |
e5047992 | 1063 | ip6_xmit(ctl_sk, buff, &fl, NULL, 0); |
63231bdd | 1064 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
626e264d IJ |
1065 | if (rst) |
1066 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
1da177e4 | 1067 | return; |
ecc51b6d | 1068 | } |
1da177e4 LT |
1069 | } |
1070 | ||
1071 | kfree_skb(buff); | |
1072 | } | |
1073 | ||
626e264d | 1074 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1075 | { |
626e264d IJ |
1076 | struct tcphdr *th = tcp_hdr(skb); |
1077 | u32 seq = 0, ack_seq = 0; | |
fa3e5b4e | 1078 | struct tcp_md5sig_key *key = NULL; |
1da177e4 | 1079 | |
626e264d | 1080 | if (th->rst) |
1da177e4 LT |
1081 | return; |
1082 | ||
626e264d IJ |
1083 | if (!ipv6_unicast_destination(skb)) |
1084 | return; | |
1da177e4 | 1085 | |
cfb6eeb4 | 1086 | #ifdef CONFIG_TCP_MD5SIG |
626e264d IJ |
1087 | if (sk) |
1088 | key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr); | |
cfb6eeb4 YH |
1089 | #endif |
1090 | ||
626e264d IJ |
1091 | if (th->ack) |
1092 | seq = ntohl(th->ack_seq); | |
1093 | else | |
1094 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
1095 | (th->doff << 2); | |
1da177e4 | 1096 | |
626e264d IJ |
1097 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1); |
1098 | } | |
1da177e4 | 1099 | |
626e264d IJ |
1100 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts, |
1101 | struct tcp_md5sig_key *key) | |
1102 | { | |
1103 | tcp_v6_send_response(skb, seq, ack, win, ts, key, 0); | |
1da177e4 LT |
1104 | } |
1105 | ||
1106 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1107 | { | |
8feaf0c0 | 1108 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 1109 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 1110 | |
9501f972 | 1111 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 1112 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
9501f972 | 1113 | tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw)); |
1da177e4 | 1114 | |
8feaf0c0 | 1115 | inet_twsk_put(tw); |
1da177e4 LT |
1116 | } |
1117 | ||
6edafaaf GJ |
1118 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
1119 | struct request_sock *req) | |
1da177e4 | 1120 | { |
9501f972 | 1121 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent, |
6edafaaf | 1122 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr)); |
1da177e4 LT |
1123 | } |
1124 | ||
1125 | ||
1126 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
1127 | { | |
60236fdd | 1128 | struct request_sock *req, **prev; |
aa8223c7 | 1129 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
1130 | struct sock *nsk; |
1131 | ||
1132 | /* Find possible connection requests. */ | |
8129765a | 1133 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
1134 | &ipv6_hdr(skb)->saddr, |
1135 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 LT |
1136 | if (req) |
1137 | return tcp_check_req(sk, skb, req, prev); | |
1138 | ||
3b1e0a65 | 1139 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
1140 | &ipv6_hdr(skb)->saddr, th->source, |
1141 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
1142 | |
1143 | if (nsk) { | |
1144 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1145 | bh_lock_sock(nsk); | |
1146 | return nsk; | |
1147 | } | |
9469c7b4 | 1148 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1149 | return NULL; |
1150 | } | |
1151 | ||
c6aefafb | 1152 | #ifdef CONFIG_SYN_COOKIES |
1da177e4 | 1153 | if (!th->rst && !th->syn && th->ack) |
c6aefafb | 1154 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1155 | #endif |
1156 | return sk; | |
1157 | } | |
1158 | ||
1da177e4 LT |
1159 | /* FIXME: this is substantially similar to the ipv4 code. |
1160 | * Can some kind of merge be done? -- erics | |
1161 | */ | |
1162 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1163 | { | |
ca304b61 | 1164 | struct inet6_request_sock *treq; |
1da177e4 LT |
1165 | struct ipv6_pinfo *np = inet6_sk(sk); |
1166 | struct tcp_options_received tmp_opt; | |
1167 | struct tcp_sock *tp = tcp_sk(sk); | |
60236fdd | 1168 | struct request_sock *req = NULL; |
1da177e4 | 1169 | __u32 isn = TCP_SKB_CB(skb)->when; |
c6aefafb GG |
1170 | #ifdef CONFIG_SYN_COOKIES |
1171 | int want_cookie = 0; | |
1172 | #else | |
1173 | #define want_cookie 0 | |
1174 | #endif | |
1da177e4 LT |
1175 | |
1176 | if (skb->protocol == htons(ETH_P_IP)) | |
1177 | return tcp_v4_conn_request(sk, skb); | |
1178 | ||
1179 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1180 | goto drop; |
1da177e4 | 1181 | |
463c84b9 | 1182 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 | 1183 | if (net_ratelimit()) |
c6aefafb GG |
1184 | syn_flood_warning(skb); |
1185 | #ifdef CONFIG_SYN_COOKIES | |
1186 | if (sysctl_tcp_syncookies) | |
1187 | want_cookie = 1; | |
1188 | else | |
1189 | #endif | |
1ab1457c | 1190 | goto drop; |
1da177e4 LT |
1191 | } |
1192 | ||
463c84b9 | 1193 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1194 | goto drop; |
1195 | ||
ca304b61 | 1196 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1197 | if (req == NULL) |
1198 | goto drop; | |
1199 | ||
cfb6eeb4 YH |
1200 | #ifdef CONFIG_TCP_MD5SIG |
1201 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
1202 | #endif | |
1203 | ||
1da177e4 LT |
1204 | tcp_clear_options(&tmp_opt); |
1205 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1206 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
1207 | ||
1208 | tcp_parse_options(skb, &tmp_opt, 0); | |
1209 | ||
4dfc2817 | 1210 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 1211 | tcp_clear_options(&tmp_opt); |
c6aefafb | 1212 | |
1da177e4 LT |
1213 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1214 | tcp_openreq_init(req, &tmp_opt, skb); | |
1215 | ||
ca304b61 | 1216 | treq = inet6_rsk(req); |
0660e03f ACM |
1217 | ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr); |
1218 | ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr); | |
c6aefafb GG |
1219 | if (!want_cookie) |
1220 | TCP_ECN_create_request(req, tcp_hdr(skb)); | |
1221 | ||
1222 | if (want_cookie) { | |
1223 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); | |
4dfc2817 | 1224 | req->cookie_ts = tmp_opt.tstamp_ok; |
c6aefafb GG |
1225 | } else if (!isn) { |
1226 | if (ipv6_opt_accepted(sk, skb) || | |
1227 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1228 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1229 | atomic_inc(&skb->users); | |
1230 | treq->pktopts = skb; | |
1231 | } | |
1232 | treq->iif = sk->sk_bound_dev_if; | |
1da177e4 | 1233 | |
c6aefafb GG |
1234 | /* So that link locals have meaning */ |
1235 | if (!sk->sk_bound_dev_if && | |
1236 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1237 | treq->iif = inet6_iif(skb); | |
1da177e4 | 1238 | |
a94f723d | 1239 | isn = tcp_v6_init_sequence(skb); |
c6aefafb | 1240 | } |
1da177e4 | 1241 | |
2e6599cb | 1242 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1243 | |
4237c75c VY |
1244 | security_inet_conn_request(sk, skb, req); |
1245 | ||
fd80eb94 | 1246 | if (tcp_v6_send_synack(sk, req)) |
1da177e4 LT |
1247 | goto drop; |
1248 | ||
c6aefafb GG |
1249 | if (!want_cookie) { |
1250 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); | |
1251 | return 0; | |
1252 | } | |
1da177e4 LT |
1253 | |
1254 | drop: | |
1255 | if (req) | |
60236fdd | 1256 | reqsk_free(req); |
1da177e4 | 1257 | |
1da177e4 LT |
1258 | return 0; /* don't send reset */ |
1259 | } | |
1260 | ||
1261 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1262 | struct request_sock *req, |
1da177e4 LT |
1263 | struct dst_entry *dst) |
1264 | { | |
78d15e82 | 1265 | struct inet6_request_sock *treq; |
1da177e4 LT |
1266 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1267 | struct tcp6_sock *newtcp6sk; | |
1268 | struct inet_sock *newinet; | |
1269 | struct tcp_sock *newtp; | |
1270 | struct sock *newsk; | |
1271 | struct ipv6_txoptions *opt; | |
cfb6eeb4 YH |
1272 | #ifdef CONFIG_TCP_MD5SIG |
1273 | struct tcp_md5sig_key *key; | |
1274 | #endif | |
1da177e4 LT |
1275 | |
1276 | if (skb->protocol == htons(ETH_P_IP)) { | |
1277 | /* | |
1278 | * v6 mapped | |
1279 | */ | |
1280 | ||
1281 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1282 | ||
1ab1457c | 1283 | if (newsk == NULL) |
1da177e4 LT |
1284 | return NULL; |
1285 | ||
1286 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1287 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1288 | ||
1289 | newinet = inet_sk(newsk); | |
1290 | newnp = inet6_sk(newsk); | |
1291 | newtp = tcp_sk(newsk); | |
1292 | ||
1293 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1294 | ||
c720c7e8 | 1295 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); |
1da177e4 | 1296 | |
c720c7e8 | 1297 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 LT |
1298 | |
1299 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1300 | ||
8292a17a | 1301 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1302 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1303 | #ifdef CONFIG_TCP_MD5SIG |
1304 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1305 | #endif | |
1306 | ||
1da177e4 LT |
1307 | newnp->pktoptions = NULL; |
1308 | newnp->opt = NULL; | |
505cbfc5 | 1309 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1310 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 | 1311 | |
e6848976 ACM |
1312 | /* |
1313 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1314 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1315 | * that function for the gory details. -acme | |
1da177e4 | 1316 | */ |
1da177e4 LT |
1317 | |
1318 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1319 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1320 | Sync it now. |
1321 | */ | |
d83d8461 | 1322 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1323 | |
1324 | return newsk; | |
1325 | } | |
1326 | ||
78d15e82 | 1327 | treq = inet6_rsk(req); |
1da177e4 LT |
1328 | opt = np->opt; |
1329 | ||
1330 | if (sk_acceptq_is_full(sk)) | |
1331 | goto out_overflow; | |
1332 | ||
1da177e4 LT |
1333 | if (dst == NULL) { |
1334 | struct in6_addr *final_p = NULL, final; | |
1335 | struct flowi fl; | |
1336 | ||
1337 | memset(&fl, 0, sizeof(fl)); | |
1338 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1339 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
1340 | if (opt && opt->srcrt) { |
1341 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1342 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1343 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1344 | final_p = &final; | |
1345 | } | |
2e6599cb | 1346 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1347 | fl.oif = sk->sk_bound_dev_if; |
51953d5b | 1348 | fl.mark = sk->sk_mark; |
2e6599cb | 1349 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
fd507037 | 1350 | fl.fl_ip_sport = inet_rsk(req)->loc_port; |
4237c75c | 1351 | security_req_classify_flow(req, &fl); |
1da177e4 LT |
1352 | |
1353 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1354 | goto out; | |
1355 | ||
1356 | if (final_p) | |
1357 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1358 | ||
52479b62 | 1359 | if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) |
1da177e4 | 1360 | goto out; |
1ab1457c | 1361 | } |
1da177e4 LT |
1362 | |
1363 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1364 | if (newsk == NULL) | |
1365 | goto out; | |
1366 | ||
e6848976 ACM |
1367 | /* |
1368 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1369 | * count here, tcp_create_openreq_child now does this for us, see the | |
1370 | * comment in that function for the gory details. -acme | |
1371 | */ | |
1da177e4 | 1372 | |
59eed279 | 1373 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1374 | __ip6_dst_store(newsk, dst, NULL, NULL); |
1da177e4 LT |
1375 | |
1376 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1377 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1378 | ||
1379 | newtp = tcp_sk(newsk); | |
1380 | newinet = inet_sk(newsk); | |
1381 | newnp = inet6_sk(newsk); | |
1382 | ||
1383 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1384 | ||
2e6599cb ACM |
1385 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1386 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1387 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1388 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 | 1389 | |
1ab1457c | 1390 | /* Now IPv6 options... |
1da177e4 LT |
1391 | |
1392 | First: no IPv4 options. | |
1393 | */ | |
1394 | newinet->opt = NULL; | |
d35690be | 1395 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1396 | |
1397 | /* Clone RX bits */ | |
1398 | newnp->rxopt.all = np->rxopt.all; | |
1399 | ||
1400 | /* Clone pktoptions received with SYN */ | |
1401 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1402 | if (treq->pktopts != NULL) { |
1403 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1404 | kfree_skb(treq->pktopts); | |
1405 | treq->pktopts = NULL; | |
1da177e4 LT |
1406 | if (newnp->pktoptions) |
1407 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1408 | } | |
1409 | newnp->opt = NULL; | |
505cbfc5 | 1410 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1411 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
1412 | |
1413 | /* Clone native IPv6 options from listening socket (if any) | |
1414 | ||
1415 | Yes, keeping reference count would be much more clever, | |
1416 | but we make one more one thing there: reattach optmem | |
1417 | to newsk. | |
1418 | */ | |
1419 | if (opt) { | |
1420 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1421 | if (opt != np->opt) | |
1422 | sock_kfree_s(sk, opt, opt->tot_len); | |
1423 | } | |
1424 | ||
d83d8461 | 1425 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1426 | if (newnp->opt) |
d83d8461 ACM |
1427 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1428 | newnp->opt->opt_flen); | |
1da177e4 | 1429 | |
5d424d5a | 1430 | tcp_mtup_init(newsk); |
1da177e4 LT |
1431 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1432 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1433 | tcp_initialize_rcv_mss(newsk); | |
1434 | ||
c720c7e8 ED |
1435 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1436 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1437 | |
cfb6eeb4 YH |
1438 | #ifdef CONFIG_TCP_MD5SIG |
1439 | /* Copy over the MD5 key from the original socket */ | |
1440 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1441 | /* We're using one, so create a matching key | |
1442 | * on the newsk structure. If we fail to get | |
1443 | * memory, then we end up not copying the key | |
1444 | * across. Shucks. | |
1445 | */ | |
af879cc7 ACM |
1446 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1447 | if (newkey != NULL) | |
e547bc1e | 1448 | tcp_v6_md5_do_add(newsk, &newnp->daddr, |
cfb6eeb4 | 1449 | newkey, key->keylen); |
cfb6eeb4 YH |
1450 | } |
1451 | #endif | |
1452 | ||
ab1e0a13 | 1453 | __inet6_hash(newsk); |
e56d8b8a | 1454 | __inet_inherit_port(sk, newsk); |
1da177e4 LT |
1455 | |
1456 | return newsk; | |
1457 | ||
1458 | out_overflow: | |
de0744af | 1459 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
1da177e4 | 1460 | out: |
de0744af | 1461 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1462 | if (opt && opt != np->opt) |
1463 | sock_kfree_s(sk, opt, opt->tot_len); | |
1464 | dst_release(dst); | |
1465 | return NULL; | |
1466 | } | |
1467 | ||
b51655b9 | 1468 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1469 | { |
84fa7933 | 1470 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
684f2176 | 1471 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1472 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1473 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1474 | return 0; |
fb286bb2 | 1475 | } |
1da177e4 | 1476 | } |
fb286bb2 | 1477 | |
684f2176 | 1478 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
0660e03f ACM |
1479 | &ipv6_hdr(skb)->saddr, |
1480 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1481 | |
1da177e4 | 1482 | if (skb->len <= 76) { |
fb286bb2 | 1483 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1484 | } |
1485 | return 0; | |
1486 | } | |
1487 | ||
1488 | /* The socket must have it's spinlock held when we get | |
1489 | * here. | |
1490 | * | |
1491 | * We have a potential double-lock case here, so even when | |
1492 | * doing backlog processing we use the BH locking scheme. | |
1493 | * This is because we cannot sleep with the original spinlock | |
1494 | * held. | |
1495 | */ | |
1496 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1497 | { | |
1498 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1499 | struct tcp_sock *tp; | |
1500 | struct sk_buff *opt_skb = NULL; | |
1501 | ||
1502 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1503 | goes to IPv4 receive handler and backlogged. | |
1504 | From backlog it always goes here. Kerboom... | |
1505 | Fortunately, tcp_rcv_established and rcv_established | |
1506 | handle them correctly, but it is not case with | |
1507 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1508 | */ | |
1509 | ||
1510 | if (skb->protocol == htons(ETH_P_IP)) | |
1511 | return tcp_v4_do_rcv(sk, skb); | |
1512 | ||
cfb6eeb4 YH |
1513 | #ifdef CONFIG_TCP_MD5SIG |
1514 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1515 | goto discard; | |
1516 | #endif | |
1517 | ||
fda9ef5d | 1518 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1519 | goto discard; |
1520 | ||
1521 | /* | |
1522 | * socket locking is here for SMP purposes as backlog rcv | |
1523 | * is currently called with bh processing disabled. | |
1524 | */ | |
1525 | ||
1526 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1527 | ||
1528 | Yes, guys, it is the only place in our code, where we | |
1529 | may make it not affecting IPv4. | |
1530 | The rest of code is protocol independent, | |
1531 | and I do not like idea to uglify IPv4. | |
1532 | ||
1533 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1534 | looks not very well thought. For now we latch | |
1535 | options, received in the last packet, enqueued | |
1536 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1537 | --ANK (980728) |
1da177e4 LT |
1538 | */ |
1539 | if (np->rxopt.all) | |
1540 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1541 | ||
1542 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1543 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1544 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1545 | goto reset; |
1546 | TCP_CHECK_TIMER(sk); | |
1547 | if (opt_skb) | |
1548 | goto ipv6_pktoptions; | |
1549 | return 0; | |
1550 | } | |
1551 | ||
ab6a5bb6 | 1552 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1553 | goto csum_err; |
1554 | ||
1ab1457c | 1555 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1556 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1557 | if (!nsk) | |
1558 | goto discard; | |
1559 | ||
1560 | /* | |
1561 | * Queue it on the new socket if the new socket is active, | |
1562 | * otherwise we just shortcircuit this and continue with | |
1563 | * the new socket.. | |
1564 | */ | |
1ab1457c | 1565 | if(nsk != sk) { |
1da177e4 LT |
1566 | if (tcp_child_process(sk, nsk, skb)) |
1567 | goto reset; | |
1568 | if (opt_skb) | |
1569 | __kfree_skb(opt_skb); | |
1570 | return 0; | |
1571 | } | |
1572 | } | |
1573 | ||
1574 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1575 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1576 | goto reset; |
1577 | TCP_CHECK_TIMER(sk); | |
1578 | if (opt_skb) | |
1579 | goto ipv6_pktoptions; | |
1580 | return 0; | |
1581 | ||
1582 | reset: | |
cfb6eeb4 | 1583 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1584 | discard: |
1585 | if (opt_skb) | |
1586 | __kfree_skb(opt_skb); | |
1587 | kfree_skb(skb); | |
1588 | return 0; | |
1589 | csum_err: | |
63231bdd | 1590 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1591 | goto discard; |
1592 | ||
1593 | ||
1594 | ipv6_pktoptions: | |
1595 | /* Do you ask, what is it? | |
1596 | ||
1597 | 1. skb was enqueued by tcp. | |
1598 | 2. skb is added to tail of read queue, rather than out of order. | |
1599 | 3. socket is not in passive state. | |
1600 | 4. Finally, it really contains options, which user wants to receive. | |
1601 | */ | |
1602 | tp = tcp_sk(sk); | |
1603 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1604 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1605 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1606 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1607 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1608 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
1da177e4 LT |
1609 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1610 | skb_set_owner_r(opt_skb, sk); | |
1611 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1612 | } else { | |
1613 | __kfree_skb(opt_skb); | |
1614 | opt_skb = xchg(&np->pktoptions, NULL); | |
1615 | } | |
1616 | } | |
1617 | ||
800d55f1 | 1618 | kfree_skb(opt_skb); |
1da177e4 LT |
1619 | return 0; |
1620 | } | |
1621 | ||
e5bbef20 | 1622 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1623 | { |
1ab1457c | 1624 | struct tcphdr *th; |
1da177e4 LT |
1625 | struct sock *sk; |
1626 | int ret; | |
a86b1e30 | 1627 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1628 | |
1629 | if (skb->pkt_type != PACKET_HOST) | |
1630 | goto discard_it; | |
1631 | ||
1632 | /* | |
1633 | * Count it even if it's bad. | |
1634 | */ | |
63231bdd | 1635 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1636 | |
1637 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1638 | goto discard_it; | |
1639 | ||
aa8223c7 | 1640 | th = tcp_hdr(skb); |
1da177e4 LT |
1641 | |
1642 | if (th->doff < sizeof(struct tcphdr)/4) | |
1643 | goto bad_packet; | |
1644 | if (!pskb_may_pull(skb, th->doff*4)) | |
1645 | goto discard_it; | |
1646 | ||
60476372 | 1647 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1da177e4 LT |
1648 | goto bad_packet; |
1649 | ||
aa8223c7 | 1650 | th = tcp_hdr(skb); |
1da177e4 LT |
1651 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1652 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1653 | skb->len - th->doff*4); | |
1654 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1655 | TCP_SKB_CB(skb)->when = 0; | |
0660e03f | 1656 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 LT |
1657 | TCP_SKB_CB(skb)->sacked = 0; |
1658 | ||
9a1f27c4 | 1659 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1660 | if (!sk) |
1661 | goto no_tcp_socket; | |
1662 | ||
1663 | process: | |
1664 | if (sk->sk_state == TCP_TIME_WAIT) | |
1665 | goto do_time_wait; | |
1666 | ||
1667 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1668 | goto discard_and_relse; | |
1669 | ||
fda9ef5d | 1670 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1671 | goto discard_and_relse; |
1672 | ||
1673 | skb->dev = NULL; | |
1674 | ||
293b9c42 | 1675 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1676 | ret = 0; |
1677 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1678 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1679 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a | 1680 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
f67b4599 | 1681 | tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY); |
1ab1457c YH |
1682 | if (tp->ucopy.dma_chan) |
1683 | ret = tcp_v6_do_rcv(sk, skb); | |
1684 | else | |
1a2449a8 CL |
1685 | #endif |
1686 | { | |
1687 | if (!tcp_prequeue(sk, skb)) | |
1688 | ret = tcp_v6_do_rcv(sk, skb); | |
1689 | } | |
1da177e4 LT |
1690 | } else |
1691 | sk_add_backlog(sk, skb); | |
1692 | bh_unlock_sock(sk); | |
1693 | ||
1694 | sock_put(sk); | |
1695 | return ret ? -1 : 0; | |
1696 | ||
1697 | no_tcp_socket: | |
1698 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1699 | goto discard_it; | |
1700 | ||
1701 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1702 | bad_packet: | |
63231bdd | 1703 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1704 | } else { |
cfb6eeb4 | 1705 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1706 | } |
1707 | ||
1708 | discard_it: | |
1709 | ||
1710 | /* | |
1711 | * Discard frame | |
1712 | */ | |
1713 | ||
1714 | kfree_skb(skb); | |
1715 | return 0; | |
1716 | ||
1717 | discard_and_relse: | |
1718 | sock_put(sk); | |
1719 | goto discard_it; | |
1720 | ||
1721 | do_time_wait: | |
1722 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1723 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1724 | goto discard_it; |
1725 | } | |
1726 | ||
1727 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
63231bdd | 1728 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
9469c7b4 | 1729 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1730 | goto discard_it; |
1731 | } | |
1732 | ||
9469c7b4 | 1733 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1734 | case TCP_TW_SYN: |
1735 | { | |
1736 | struct sock *sk2; | |
1737 | ||
c346dca1 | 1738 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
0660e03f | 1739 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1740 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1741 | if (sk2 != NULL) { |
295ff7ed ACM |
1742 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1743 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1744 | inet_twsk_put(tw); | |
1da177e4 LT |
1745 | sk = sk2; |
1746 | goto process; | |
1747 | } | |
1748 | /* Fall through to ACK */ | |
1749 | } | |
1750 | case TCP_TW_ACK: | |
1751 | tcp_v6_timewait_ack(sk, skb); | |
1752 | break; | |
1753 | case TCP_TW_RST: | |
1754 | goto no_tcp_socket; | |
1755 | case TCP_TW_SUCCESS:; | |
1756 | } | |
1757 | goto discard_it; | |
1758 | } | |
1759 | ||
1da177e4 LT |
1760 | static int tcp_v6_remember_stamp(struct sock *sk) |
1761 | { | |
1762 | /* Alas, not yet... */ | |
1763 | return 0; | |
1764 | } | |
1765 | ||
3b401a81 | 1766 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1767 | .queue_xmit = inet6_csk_xmit, |
1768 | .send_check = tcp_v6_send_check, | |
1769 | .rebuild_header = inet6_sk_rebuild_header, | |
1770 | .conn_request = tcp_v6_conn_request, | |
1771 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1772 | .remember_stamp = tcp_v6_remember_stamp, | |
1773 | .net_header_len = sizeof(struct ipv6hdr), | |
1774 | .setsockopt = ipv6_setsockopt, | |
1775 | .getsockopt = ipv6_getsockopt, | |
1776 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1777 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1778 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1779 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1780 | .compat_setsockopt = compat_ipv6_setsockopt, |
1781 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1782 | #endif |
1da177e4 LT |
1783 | }; |
1784 | ||
cfb6eeb4 | 1785 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1786 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1787 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1788 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 YH |
1789 | .md5_add = tcp_v6_md5_add_func, |
1790 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1791 | }; |
a928630a | 1792 | #endif |
cfb6eeb4 | 1793 | |
1da177e4 LT |
1794 | /* |
1795 | * TCP over IPv4 via INET6 API | |
1796 | */ | |
1797 | ||
3b401a81 | 1798 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1799 | .queue_xmit = ip_queue_xmit, |
1800 | .send_check = tcp_v4_send_check, | |
1801 | .rebuild_header = inet_sk_rebuild_header, | |
1802 | .conn_request = tcp_v6_conn_request, | |
1803 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1804 | .remember_stamp = tcp_v4_remember_stamp, | |
1805 | .net_header_len = sizeof(struct iphdr), | |
1806 | .setsockopt = ipv6_setsockopt, | |
1807 | .getsockopt = ipv6_getsockopt, | |
1808 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1809 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1810 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1811 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1812 | .compat_setsockopt = compat_ipv6_setsockopt, |
1813 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1814 | #endif |
1da177e4 LT |
1815 | }; |
1816 | ||
cfb6eeb4 | 1817 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1818 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1819 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1820 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 YH |
1821 | .md5_add = tcp_v6_md5_add_func, |
1822 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1823 | }; |
a928630a | 1824 | #endif |
cfb6eeb4 | 1825 | |
1da177e4 LT |
1826 | /* NOTE: A lot of things set to zero explicitly by call to |
1827 | * sk_alloc() so need not be done here. | |
1828 | */ | |
1829 | static int tcp_v6_init_sock(struct sock *sk) | |
1830 | { | |
6687e988 | 1831 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1832 | struct tcp_sock *tp = tcp_sk(sk); |
1833 | ||
1834 | skb_queue_head_init(&tp->out_of_order_queue); | |
1835 | tcp_init_xmit_timers(sk); | |
1836 | tcp_prequeue_init(tp); | |
1837 | ||
6687e988 | 1838 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1839 | tp->mdev = TCP_TIMEOUT_INIT; |
1840 | ||
1841 | /* So many TCP implementations out there (incorrectly) count the | |
1842 | * initial SYN frame in their delayed-ACK and congestion control | |
1843 | * algorithms that we must have the following bandaid to talk | |
1844 | * efficiently to them. -DaveM | |
1845 | */ | |
1846 | tp->snd_cwnd = 2; | |
1847 | ||
1848 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1849 | * initialization of these values. | |
1850 | */ | |
0b6a05c1 | 1851 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; |
1da177e4 | 1852 | tp->snd_cwnd_clamp = ~0; |
c1b4a7e6 | 1853 | tp->mss_cache = 536; |
1da177e4 LT |
1854 | |
1855 | tp->reordering = sysctl_tcp_reordering; | |
1856 | ||
1857 | sk->sk_state = TCP_CLOSE; | |
1858 | ||
8292a17a | 1859 | icsk->icsk_af_ops = &ipv6_specific; |
6687e988 | 1860 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
d83d8461 | 1861 | icsk->icsk_sync_mss = tcp_sync_mss; |
1da177e4 LT |
1862 | sk->sk_write_space = sk_stream_write_space; |
1863 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1864 | ||
cfb6eeb4 YH |
1865 | #ifdef CONFIG_TCP_MD5SIG |
1866 | tp->af_specific = &tcp_sock_ipv6_specific; | |
1867 | #endif | |
1868 | ||
1da177e4 LT |
1869 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
1870 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1871 | ||
eb4dea58 | 1872 | local_bh_disable(); |
1748376b | 1873 | percpu_counter_inc(&tcp_sockets_allocated); |
eb4dea58 | 1874 | local_bh_enable(); |
1da177e4 LT |
1875 | |
1876 | return 0; | |
1877 | } | |
1878 | ||
7d06b2e0 | 1879 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1880 | { |
cfb6eeb4 YH |
1881 | #ifdef CONFIG_TCP_MD5SIG |
1882 | /* Clean up the MD5 key list */ | |
1883 | if (tcp_sk(sk)->md5sig_info) | |
1884 | tcp_v6_clear_md5_list(sk); | |
1885 | #endif | |
1da177e4 | 1886 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1887 | inet6_destroy_sock(sk); |
1da177e4 LT |
1888 | } |
1889 | ||
952a10be | 1890 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1891 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1892 | static void get_openreq6(struct seq_file *seq, |
60236fdd | 1893 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 1894 | { |
1da177e4 | 1895 | int ttd = req->expires - jiffies; |
ca304b61 ACM |
1896 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1897 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1898 | |
1899 | if (ttd < 0) | |
1900 | ttd = 0; | |
1901 | ||
1da177e4 LT |
1902 | seq_printf(seq, |
1903 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1904 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1905 | i, | |
1906 | src->s6_addr32[0], src->s6_addr32[1], | |
1907 | src->s6_addr32[2], src->s6_addr32[3], | |
fd507037 | 1908 | ntohs(inet_rsk(req)->loc_port), |
1da177e4 LT |
1909 | dest->s6_addr32[0], dest->s6_addr32[1], |
1910 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1911 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1912 | TCP_SYN_RECV, |
1913 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
1914 | 1, /* timers active (only the expire timer) */ |
1915 | jiffies_to_clock_t(ttd), | |
1da177e4 LT |
1916 | req->retrans, |
1917 | uid, | |
1ab1457c | 1918 | 0, /* non standard timer */ |
1da177e4 LT |
1919 | 0, /* open_requests have no inode */ |
1920 | 0, req); | |
1921 | } | |
1922 | ||
1923 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1924 | { | |
1925 | struct in6_addr *dest, *src; | |
1926 | __u16 destp, srcp; | |
1927 | int timer_active; | |
1928 | unsigned long timer_expires; | |
1929 | struct inet_sock *inet = inet_sk(sp); | |
1930 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1931 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
1932 | struct ipv6_pinfo *np = inet6_sk(sp); |
1933 | ||
1934 | dest = &np->daddr; | |
1935 | src = &np->rcv_saddr; | |
c720c7e8 ED |
1936 | destp = ntohs(inet->inet_dport); |
1937 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
1938 | |
1939 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1940 | timer_active = 1; |
463c84b9 ACM |
1941 | timer_expires = icsk->icsk_timeout; |
1942 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1943 | timer_active = 4; |
463c84b9 | 1944 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1945 | } else if (timer_pending(&sp->sk_timer)) { |
1946 | timer_active = 2; | |
1947 | timer_expires = sp->sk_timer.expires; | |
1948 | } else { | |
1949 | timer_active = 0; | |
1950 | timer_expires = jiffies; | |
1951 | } | |
1952 | ||
1953 | seq_printf(seq, | |
1954 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
7be87351 | 1955 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n", |
1da177e4 LT |
1956 | i, |
1957 | src->s6_addr32[0], src->s6_addr32[1], | |
1958 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1959 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1960 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1961 | sp->sk_state, |
47da8ee6 SS |
1962 | tp->write_seq-tp->snd_una, |
1963 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 LT |
1964 | timer_active, |
1965 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 1966 | icsk->icsk_retransmits, |
1da177e4 | 1967 | sock_i_uid(sp), |
6687e988 | 1968 | icsk->icsk_probes_out, |
1da177e4 LT |
1969 | sock_i_ino(sp), |
1970 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1971 | jiffies_to_clock_t(icsk->icsk_rto), |
1972 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 1973 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
0b6a05c1 IJ |
1974 | tp->snd_cwnd, |
1975 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh | |
1da177e4 LT |
1976 | ); |
1977 | } | |
1978 | ||
1ab1457c | 1979 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1980 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
1981 | { |
1982 | struct in6_addr *dest, *src; | |
1983 | __u16 destp, srcp; | |
0fa1a53e | 1984 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
1985 | int ttd = tw->tw_ttd - jiffies; |
1986 | ||
1987 | if (ttd < 0) | |
1988 | ttd = 0; | |
1989 | ||
0fa1a53e ACM |
1990 | dest = &tw6->tw_v6_daddr; |
1991 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
1992 | destp = ntohs(tw->tw_dport); |
1993 | srcp = ntohs(tw->tw_sport); | |
1994 | ||
1995 | seq_printf(seq, | |
1996 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1997 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1998 | i, | |
1999 | src->s6_addr32[0], src->s6_addr32[1], | |
2000 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2001 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2002 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2003 | tw->tw_substate, 0, 0, | |
2004 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2005 | atomic_read(&tw->tw_refcnt), tw); | |
2006 | } | |
2007 | ||
1da177e4 LT |
2008 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
2009 | { | |
2010 | struct tcp_iter_state *st; | |
2011 | ||
2012 | if (v == SEQ_START_TOKEN) { | |
2013 | seq_puts(seq, | |
2014 | " sl " | |
2015 | "local_address " | |
2016 | "remote_address " | |
2017 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2018 | " uid timeout inode\n"); | |
2019 | goto out; | |
2020 | } | |
2021 | st = seq->private; | |
2022 | ||
2023 | switch (st->state) { | |
2024 | case TCP_SEQ_STATE_LISTENING: | |
2025 | case TCP_SEQ_STATE_ESTABLISHED: | |
2026 | get_tcp6_sock(seq, v, st->num); | |
2027 | break; | |
2028 | case TCP_SEQ_STATE_OPENREQ: | |
2029 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
2030 | break; | |
2031 | case TCP_SEQ_STATE_TIME_WAIT: | |
2032 | get_timewait6_sock(seq, v, st->num); | |
2033 | break; | |
2034 | } | |
2035 | out: | |
2036 | return 0; | |
2037 | } | |
2038 | ||
1da177e4 | 2039 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
2040 | .name = "tcp6", |
2041 | .family = AF_INET6, | |
5f4472c5 DL |
2042 | .seq_fops = { |
2043 | .owner = THIS_MODULE, | |
2044 | }, | |
9427c4b3 DL |
2045 | .seq_ops = { |
2046 | .show = tcp6_seq_show, | |
2047 | }, | |
1da177e4 LT |
2048 | }; |
2049 | ||
6f8b13bc | 2050 | int tcp6_proc_init(struct net *net) |
1da177e4 | 2051 | { |
6f8b13bc | 2052 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2053 | } |
2054 | ||
6f8b13bc | 2055 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2056 | { |
6f8b13bc | 2057 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2058 | } |
2059 | #endif | |
2060 | ||
2061 | struct proto tcpv6_prot = { | |
2062 | .name = "TCPv6", | |
2063 | .owner = THIS_MODULE, | |
2064 | .close = tcp_close, | |
2065 | .connect = tcp_v6_connect, | |
2066 | .disconnect = tcp_disconnect, | |
463c84b9 | 2067 | .accept = inet_csk_accept, |
1da177e4 LT |
2068 | .ioctl = tcp_ioctl, |
2069 | .init = tcp_v6_init_sock, | |
2070 | .destroy = tcp_v6_destroy_sock, | |
2071 | .shutdown = tcp_shutdown, | |
2072 | .setsockopt = tcp_setsockopt, | |
2073 | .getsockopt = tcp_getsockopt, | |
1da177e4 LT |
2074 | .recvmsg = tcp_recvmsg, |
2075 | .backlog_rcv = tcp_v6_do_rcv, | |
2076 | .hash = tcp_v6_hash, | |
ab1e0a13 ACM |
2077 | .unhash = inet_unhash, |
2078 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2079 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2080 | .sockets_allocated = &tcp_sockets_allocated, | |
2081 | .memory_allocated = &tcp_memory_allocated, | |
2082 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2083 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2084 | .sysctl_mem = sysctl_tcp_mem, |
2085 | .sysctl_wmem = sysctl_tcp_wmem, | |
2086 | .sysctl_rmem = sysctl_tcp_rmem, | |
2087 | .max_header = MAX_TCP_HEADER, | |
2088 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 2089 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 2090 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2091 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2092 | .h.hashinfo = &tcp_hashinfo, |
543d9cfe ACM |
2093 | #ifdef CONFIG_COMPAT |
2094 | .compat_setsockopt = compat_tcp_setsockopt, | |
2095 | .compat_getsockopt = compat_tcp_getsockopt, | |
2096 | #endif | |
1da177e4 LT |
2097 | }; |
2098 | ||
41135cc8 | 2099 | static const struct inet6_protocol tcpv6_protocol = { |
1da177e4 LT |
2100 | .handler = tcp_v6_rcv, |
2101 | .err_handler = tcp_v6_err, | |
a430a43d | 2102 | .gso_send_check = tcp_v6_gso_send_check, |
adcfc7d0 | 2103 | .gso_segment = tcp_tso_segment, |
684f2176 HX |
2104 | .gro_receive = tcp6_gro_receive, |
2105 | .gro_complete = tcp6_gro_complete, | |
1da177e4 LT |
2106 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
2107 | }; | |
2108 | ||
1da177e4 LT |
2109 | static struct inet_protosw tcpv6_protosw = { |
2110 | .type = SOCK_STREAM, | |
2111 | .protocol = IPPROTO_TCP, | |
2112 | .prot = &tcpv6_prot, | |
2113 | .ops = &inet6_stream_ops, | |
2114 | .capability = -1, | |
2115 | .no_check = 0, | |
d83d8461 ACM |
2116 | .flags = INET_PROTOSW_PERMANENT | |
2117 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2118 | }; |
2119 | ||
93ec926b DL |
2120 | static int tcpv6_net_init(struct net *net) |
2121 | { | |
5677242f DL |
2122 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2123 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2124 | } |
2125 | ||
2126 | static void tcpv6_net_exit(struct net *net) | |
2127 | { | |
5677242f | 2128 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
d315492b | 2129 | inet_twsk_purge(net, &tcp_hashinfo, &tcp_death_row, AF_INET6); |
93ec926b DL |
2130 | } |
2131 | ||
2132 | static struct pernet_operations tcpv6_net_ops = { | |
2133 | .init = tcpv6_net_init, | |
2134 | .exit = tcpv6_net_exit, | |
2135 | }; | |
2136 | ||
7f4e4868 | 2137 | int __init tcpv6_init(void) |
1da177e4 | 2138 | { |
7f4e4868 DL |
2139 | int ret; |
2140 | ||
2141 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2142 | if (ret) | |
2143 | goto out; | |
2144 | ||
1da177e4 | 2145 | /* register inet6 protocol */ |
7f4e4868 DL |
2146 | ret = inet6_register_protosw(&tcpv6_protosw); |
2147 | if (ret) | |
2148 | goto out_tcpv6_protocol; | |
2149 | ||
93ec926b | 2150 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2151 | if (ret) |
2152 | goto out_tcpv6_protosw; | |
2153 | out: | |
2154 | return ret; | |
ae0f7d5f | 2155 | |
7f4e4868 DL |
2156 | out_tcpv6_protocol: |
2157 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2158 | out_tcpv6_protosw: | |
2159 | inet6_unregister_protosw(&tcpv6_protosw); | |
2160 | goto out; | |
2161 | } | |
2162 | ||
09f7709f | 2163 | void tcpv6_exit(void) |
7f4e4868 | 2164 | { |
93ec926b | 2165 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2166 | inet6_unregister_protosw(&tcpv6_protosw); |
2167 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2168 | } |