Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * TCP over IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * |
8 | * $Id: tcp_ipv6.c,v 1.144 2002/02/01 22:01:04 davem Exp $ | |
9 | * | |
1ab1457c | 10 | * Based on: |
1da177e4 LT |
11 | * linux/net/ipv4/tcp.c |
12 | * linux/net/ipv4/tcp_input.c | |
13 | * linux/net/ipv4/tcp_output.c | |
14 | * | |
15 | * Fixes: | |
16 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
17 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
18 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
19 | * a single port at the same time. | |
20 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file. | |
21 | * | |
22 | * This program is free software; you can redistribute it and/or | |
23 | * modify it under the terms of the GNU General Public License | |
24 | * as published by the Free Software Foundation; either version | |
25 | * 2 of the License, or (at your option) any later version. | |
26 | */ | |
27 | ||
28 | #include <linux/module.h> | |
1da177e4 LT |
29 | #include <linux/errno.h> |
30 | #include <linux/types.h> | |
31 | #include <linux/socket.h> | |
32 | #include <linux/sockios.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/jiffies.h> | |
35 | #include <linux/in.h> | |
36 | #include <linux/in6.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/jhash.h> | |
40 | #include <linux/ipsec.h> | |
41 | #include <linux/times.h> | |
42 | ||
43 | #include <linux/ipv6.h> | |
44 | #include <linux/icmpv6.h> | |
45 | #include <linux/random.h> | |
46 | ||
47 | #include <net/tcp.h> | |
48 | #include <net/ndisc.h> | |
5324a040 | 49 | #include <net/inet6_hashtables.h> |
8129765a | 50 | #include <net/inet6_connection_sock.h> |
1da177e4 LT |
51 | #include <net/ipv6.h> |
52 | #include <net/transp_v6.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/ip6_route.h> | |
55 | #include <net/ip6_checksum.h> | |
56 | #include <net/inet_ecn.h> | |
57 | #include <net/protocol.h> | |
58 | #include <net/xfrm.h> | |
1da177e4 LT |
59 | #include <net/snmp.h> |
60 | #include <net/dsfield.h> | |
6d6ee43e | 61 | #include <net/timewait_sock.h> |
18134bed | 62 | #include <net/netdma.h> |
3d58b5fa | 63 | #include <net/inet_common.h> |
1da177e4 LT |
64 | |
65 | #include <asm/uaccess.h> | |
66 | ||
67 | #include <linux/proc_fs.h> | |
68 | #include <linux/seq_file.h> | |
69 | ||
cfb6eeb4 YH |
70 | #include <linux/crypto.h> |
71 | #include <linux/scatterlist.h> | |
72 | ||
cfb6eeb4 | 73 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
60236fdd | 74 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req); |
1ab1457c | 75 | static void tcp_v6_send_check(struct sock *sk, int len, |
1da177e4 LT |
76 | struct sk_buff *skb); |
77 | ||
78 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 79 | |
8292a17a ACM |
80 | static struct inet_connection_sock_af_ops ipv6_mapped; |
81 | static struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 82 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
83 | static struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
84 | static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
a928630a | 85 | #endif |
1da177e4 | 86 | |
1da177e4 LT |
87 | static void tcp_v6_hash(struct sock *sk) |
88 | { | |
89 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 90 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
91 | tcp_prot.hash(sk); |
92 | return; | |
93 | } | |
94 | local_bh_disable(); | |
ab1e0a13 | 95 | __inet6_hash(sk); |
1da177e4 LT |
96 | local_bh_enable(); |
97 | } | |
98 | } | |
99 | ||
868c86bc | 100 | static __inline__ __sum16 tcp_v6_check(struct tcphdr *th, int len, |
1ab1457c YH |
101 | struct in6_addr *saddr, |
102 | struct in6_addr *daddr, | |
868c86bc | 103 | __wsum base) |
1da177e4 LT |
104 | { |
105 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
106 | } | |
107 | ||
a94f723d | 108 | static __u32 tcp_v6_init_sequence(struct sk_buff *skb) |
1da177e4 | 109 | { |
0660e03f ACM |
110 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
111 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
112 | tcp_hdr(skb)->dest, |
113 | tcp_hdr(skb)->source); | |
1da177e4 LT |
114 | } |
115 | ||
1ab1457c | 116 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
117 | int addr_len) |
118 | { | |
119 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 120 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 121 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
122 | struct ipv6_pinfo *np = inet6_sk(sk); |
123 | struct tcp_sock *tp = tcp_sk(sk); | |
124 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
125 | struct flowi fl; | |
126 | struct dst_entry *dst; | |
127 | int addr_type; | |
128 | int err; | |
129 | ||
1ab1457c | 130 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
131 | return -EINVAL; |
132 | ||
1ab1457c | 133 | if (usin->sin6_family != AF_INET6) |
1da177e4 LT |
134 | return(-EAFNOSUPPORT); |
135 | ||
136 | memset(&fl, 0, sizeof(fl)); | |
137 | ||
138 | if (np->sndflow) { | |
139 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
140 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
141 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
142 | struct ip6_flowlabel *flowlabel; | |
143 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
144 | if (flowlabel == NULL) | |
145 | return -EINVAL; | |
146 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
147 | fl6_sock_release(flowlabel); | |
148 | } | |
149 | } | |
150 | ||
151 | /* | |
1ab1457c YH |
152 | * connect() to INADDR_ANY means loopback (BSD'ism). |
153 | */ | |
154 | ||
155 | if(ipv6_addr_any(&usin->sin6_addr)) | |
156 | usin->sin6_addr.s6_addr[15] = 0x1; | |
1da177e4 LT |
157 | |
158 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
159 | ||
160 | if(addr_type & IPV6_ADDR_MULTICAST) | |
161 | return -ENETUNREACH; | |
162 | ||
163 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
164 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
165 | usin->sin6_scope_id) { | |
166 | /* If interface is set while binding, indices | |
167 | * must coincide. | |
168 | */ | |
169 | if (sk->sk_bound_dev_if && | |
170 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
171 | return -EINVAL; | |
172 | ||
173 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
174 | } | |
175 | ||
176 | /* Connect to link-local address requires an interface */ | |
177 | if (!sk->sk_bound_dev_if) | |
178 | return -EINVAL; | |
179 | } | |
180 | ||
181 | if (tp->rx_opt.ts_recent_stamp && | |
182 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
183 | tp->rx_opt.ts_recent = 0; | |
184 | tp->rx_opt.ts_recent_stamp = 0; | |
185 | tp->write_seq = 0; | |
186 | } | |
187 | ||
188 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
189 | np->flow_label = fl.fl6_flowlabel; | |
190 | ||
191 | /* | |
192 | * TCP over IPv4 | |
193 | */ | |
194 | ||
195 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 196 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
197 | struct sockaddr_in sin; |
198 | ||
199 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
200 | ||
201 | if (__ipv6_only_sock(sk)) | |
202 | return -ENETUNREACH; | |
203 | ||
204 | sin.sin_family = AF_INET; | |
205 | sin.sin_port = usin->sin6_port; | |
206 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
207 | ||
d83d8461 | 208 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 209 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
210 | #ifdef CONFIG_TCP_MD5SIG |
211 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
212 | #endif | |
1da177e4 LT |
213 | |
214 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
215 | ||
216 | if (err) { | |
d83d8461 ACM |
217 | icsk->icsk_ext_hdr_len = exthdrlen; |
218 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 219 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
220 | #ifdef CONFIG_TCP_MD5SIG |
221 | tp->af_specific = &tcp_sock_ipv6_specific; | |
222 | #endif | |
1da177e4 LT |
223 | goto failure; |
224 | } else { | |
225 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
226 | inet->saddr); | |
227 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
228 | inet->rcv_saddr); | |
229 | } | |
230 | ||
231 | return err; | |
232 | } | |
233 | ||
234 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
235 | saddr = &np->rcv_saddr; | |
236 | ||
237 | fl.proto = IPPROTO_TCP; | |
238 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
239 | ipv6_addr_copy(&fl.fl6_src, | |
240 | (saddr ? saddr : &np->saddr)); | |
241 | fl.oif = sk->sk_bound_dev_if; | |
242 | fl.fl_ip_dport = usin->sin6_port; | |
243 | fl.fl_ip_sport = inet->sport; | |
244 | ||
245 | if (np->opt && np->opt->srcrt) { | |
246 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
247 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
248 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
249 | final_p = &final; | |
250 | } | |
251 | ||
beb8d13b VY |
252 | security_sk_classify_flow(sk, &fl); |
253 | ||
1da177e4 LT |
254 | err = ip6_dst_lookup(sk, &dst, &fl); |
255 | if (err) | |
256 | goto failure; | |
257 | if (final_p) | |
258 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
259 | ||
bb72845e | 260 | if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) { |
14e50e57 DM |
261 | if (err == -EREMOTE) |
262 | err = ip6_dst_blackhole(sk, &dst, &fl); | |
263 | if (err < 0) | |
264 | goto failure; | |
265 | } | |
1da177e4 LT |
266 | |
267 | if (saddr == NULL) { | |
268 | saddr = &fl.fl6_src; | |
269 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
270 | } | |
271 | ||
272 | /* set the source address */ | |
273 | ipv6_addr_copy(&np->saddr, saddr); | |
274 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
275 | ||
f83ef8c0 | 276 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 277 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 278 | |
d83d8461 | 279 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 280 | if (np->opt) |
d83d8461 ACM |
281 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
282 | np->opt->opt_nflen); | |
1da177e4 LT |
283 | |
284 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
285 | ||
286 | inet->dport = usin->sin6_port; | |
287 | ||
288 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 289 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
290 | if (err) |
291 | goto late_failure; | |
292 | ||
293 | if (!tp->write_seq) | |
294 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
295 | np->daddr.s6_addr32, | |
296 | inet->sport, | |
297 | inet->dport); | |
298 | ||
299 | err = tcp_connect(sk); | |
300 | if (err) | |
301 | goto late_failure; | |
302 | ||
303 | return 0; | |
304 | ||
305 | late_failure: | |
306 | tcp_set_state(sk, TCP_CLOSE); | |
307 | __sk_dst_reset(sk); | |
308 | failure: | |
309 | inet->dport = 0; | |
310 | sk->sk_route_caps = 0; | |
311 | return err; | |
312 | } | |
313 | ||
314 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
04ce6909 | 315 | int type, int code, int offset, __be32 info) |
1da177e4 LT |
316 | { |
317 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
505cbfc5 | 318 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
319 | struct ipv6_pinfo *np; |
320 | struct sock *sk; | |
321 | int err; | |
1ab1457c | 322 | struct tcp_sock *tp; |
1da177e4 LT |
323 | __u32 seq; |
324 | ||
c346dca1 | 325 | sk = inet6_lookup(dev_net(skb->dev), &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 326 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
327 | |
328 | if (sk == NULL) { | |
329 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
330 | return; | |
331 | } | |
332 | ||
333 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 334 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
335 | return; |
336 | } | |
337 | ||
338 | bh_lock_sock(sk); | |
339 | if (sock_owned_by_user(sk)) | |
340 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
341 | ||
342 | if (sk->sk_state == TCP_CLOSE) | |
343 | goto out; | |
344 | ||
345 | tp = tcp_sk(sk); | |
1ab1457c | 346 | seq = ntohl(th->seq); |
1da177e4 LT |
347 | if (sk->sk_state != TCP_LISTEN && |
348 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
349 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
350 | goto out; | |
351 | } | |
352 | ||
353 | np = inet6_sk(sk); | |
354 | ||
355 | if (type == ICMPV6_PKT_TOOBIG) { | |
356 | struct dst_entry *dst = NULL; | |
357 | ||
358 | if (sock_owned_by_user(sk)) | |
359 | goto out; | |
360 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
361 | goto out; | |
362 | ||
363 | /* icmp should have updated the destination cache entry */ | |
364 | dst = __sk_dst_check(sk, np->dst_cookie); | |
365 | ||
366 | if (dst == NULL) { | |
367 | struct inet_sock *inet = inet_sk(sk); | |
368 | struct flowi fl; | |
369 | ||
370 | /* BUGGG_FUTURE: Again, it is not clear how | |
371 | to handle rthdr case. Ignore this complexity | |
372 | for now. | |
373 | */ | |
374 | memset(&fl, 0, sizeof(fl)); | |
375 | fl.proto = IPPROTO_TCP; | |
376 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
377 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
378 | fl.oif = sk->sk_bound_dev_if; | |
379 | fl.fl_ip_dport = inet->dport; | |
380 | fl.fl_ip_sport = inet->sport; | |
beb8d13b | 381 | security_skb_classify_flow(skb, &fl); |
1da177e4 LT |
382 | |
383 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
384 | sk->sk_err_soft = -err; | |
385 | goto out; | |
386 | } | |
387 | ||
388 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
389 | sk->sk_err_soft = -err; | |
390 | goto out; | |
391 | } | |
392 | ||
393 | } else | |
394 | dst_hold(dst); | |
395 | ||
d83d8461 | 396 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
1da177e4 LT |
397 | tcp_sync_mss(sk, dst_mtu(dst)); |
398 | tcp_simple_retransmit(sk); | |
399 | } /* else let the usual retransmit timer handle it */ | |
400 | dst_release(dst); | |
401 | goto out; | |
402 | } | |
403 | ||
404 | icmpv6_err_convert(type, code, &err); | |
405 | ||
60236fdd | 406 | /* Might be for an request_sock */ |
1da177e4 | 407 | switch (sk->sk_state) { |
60236fdd | 408 | struct request_sock *req, **prev; |
1da177e4 LT |
409 | case TCP_LISTEN: |
410 | if (sock_owned_by_user(sk)) | |
411 | goto out; | |
412 | ||
8129765a ACM |
413 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
414 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
415 | if (!req) |
416 | goto out; | |
417 | ||
418 | /* ICMPs are not backlogged, hence we cannot get | |
419 | * an established socket here. | |
420 | */ | |
421 | BUG_TRAP(req->sk == NULL); | |
422 | ||
2e6599cb | 423 | if (seq != tcp_rsk(req)->snt_isn) { |
1da177e4 LT |
424 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
425 | goto out; | |
426 | } | |
427 | ||
463c84b9 | 428 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
429 | goto out; |
430 | ||
431 | case TCP_SYN_SENT: | |
432 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 433 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 434 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
435 | sk->sk_err = err; |
436 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
437 | ||
438 | tcp_done(sk); | |
439 | } else | |
440 | sk->sk_err_soft = err; | |
441 | goto out; | |
442 | } | |
443 | ||
444 | if (!sock_owned_by_user(sk) && np->recverr) { | |
445 | sk->sk_err = err; | |
446 | sk->sk_error_report(sk); | |
447 | } else | |
448 | sk->sk_err_soft = err; | |
449 | ||
450 | out: | |
451 | bh_unlock_sock(sk); | |
452 | sock_put(sk); | |
453 | } | |
454 | ||
455 | ||
fd80eb94 | 456 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req) |
1da177e4 | 457 | { |
ca304b61 | 458 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
459 | struct ipv6_pinfo *np = inet6_sk(sk); |
460 | struct sk_buff * skb; | |
461 | struct ipv6_txoptions *opt = NULL; | |
462 | struct in6_addr * final_p = NULL, final; | |
463 | struct flowi fl; | |
fd80eb94 | 464 | struct dst_entry *dst; |
1da177e4 LT |
465 | int err = -1; |
466 | ||
467 | memset(&fl, 0, sizeof(fl)); | |
468 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
469 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
470 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 471 | fl.fl6_flowlabel = 0; |
2e6599cb ACM |
472 | fl.oif = treq->iif; |
473 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
1da177e4 | 474 | fl.fl_ip_sport = inet_sk(sk)->sport; |
4237c75c | 475 | security_req_classify_flow(req, &fl); |
1da177e4 | 476 | |
fd80eb94 DL |
477 | opt = np->opt; |
478 | if (opt && opt->srcrt) { | |
479 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
480 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
481 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
482 | final_p = &final; | |
1da177e4 LT |
483 | } |
484 | ||
fd80eb94 DL |
485 | err = ip6_dst_lookup(sk, &dst, &fl); |
486 | if (err) | |
487 | goto done; | |
488 | if (final_p) | |
489 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
490 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
491 | goto done; | |
492 | ||
1da177e4 LT |
493 | skb = tcp_make_synack(sk, dst, req); |
494 | if (skb) { | |
aa8223c7 | 495 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
496 | |
497 | th->check = tcp_v6_check(th, skb->len, | |
2e6599cb | 498 | &treq->loc_addr, &treq->rmt_addr, |
1da177e4 LT |
499 | csum_partial((char *)th, skb->len, skb->csum)); |
500 | ||
2e6599cb | 501 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 | 502 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
b9df3cb8 | 503 | err = net_xmit_eval(err); |
1da177e4 LT |
504 | } |
505 | ||
506 | done: | |
1ab1457c | 507 | if (opt && opt != np->opt) |
1da177e4 | 508 | sock_kfree_s(sk, opt, opt->tot_len); |
78b91042 | 509 | dst_release(dst); |
1da177e4 LT |
510 | return err; |
511 | } | |
512 | ||
c6aefafb GG |
513 | static inline void syn_flood_warning(struct sk_buff *skb) |
514 | { | |
515 | #ifdef CONFIG_SYN_COOKIES | |
516 | if (sysctl_tcp_syncookies) | |
517 | printk(KERN_INFO | |
518 | "TCPv6: Possible SYN flooding on port %d. " | |
519 | "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest)); | |
520 | else | |
521 | #endif | |
522 | printk(KERN_INFO | |
523 | "TCPv6: Possible SYN flooding on port %d. " | |
524 | "Dropping request.\n", ntohs(tcp_hdr(skb)->dest)); | |
525 | } | |
526 | ||
60236fdd | 527 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 528 | { |
ca304b61 ACM |
529 | if (inet6_rsk(req)->pktopts) |
530 | kfree_skb(inet6_rsk(req)->pktopts); | |
1da177e4 LT |
531 | } |
532 | ||
cfb6eeb4 YH |
533 | #ifdef CONFIG_TCP_MD5SIG |
534 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
535 | struct in6_addr *addr) | |
536 | { | |
537 | struct tcp_sock *tp = tcp_sk(sk); | |
538 | int i; | |
539 | ||
540 | BUG_ON(tp == NULL); | |
541 | ||
542 | if (!tp->md5sig_info || !tp->md5sig_info->entries6) | |
543 | return NULL; | |
544 | ||
545 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 546 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr)) |
f8ab18d2 | 547 | return &tp->md5sig_info->keys6[i].base; |
cfb6eeb4 YH |
548 | } |
549 | return NULL; | |
550 | } | |
551 | ||
552 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
553 | struct sock *addr_sk) | |
554 | { | |
555 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); | |
556 | } | |
557 | ||
558 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
559 | struct request_sock *req) | |
560 | { | |
561 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
562 | } | |
563 | ||
564 | static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer, | |
565 | char *newkey, u8 newkeylen) | |
566 | { | |
567 | /* Add key to the list */ | |
b0a713e9 | 568 | struct tcp_md5sig_key *key; |
cfb6eeb4 YH |
569 | struct tcp_sock *tp = tcp_sk(sk); |
570 | struct tcp6_md5sig_key *keys; | |
571 | ||
b0a713e9 | 572 | key = tcp_v6_md5_do_lookup(sk, peer); |
cfb6eeb4 YH |
573 | if (key) { |
574 | /* modify existing entry - just update that one */ | |
b0a713e9 MD |
575 | kfree(key->key); |
576 | key->key = newkey; | |
577 | key->keylen = newkeylen; | |
cfb6eeb4 YH |
578 | } else { |
579 | /* reallocate new list if current one is full. */ | |
580 | if (!tp->md5sig_info) { | |
581 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC); | |
582 | if (!tp->md5sig_info) { | |
583 | kfree(newkey); | |
584 | return -ENOMEM; | |
585 | } | |
3d7dbeac | 586 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 | 587 | } |
aacbe8c8 YH |
588 | if (tcp_alloc_md5sig_pool() == NULL) { |
589 | kfree(newkey); | |
590 | return -ENOMEM; | |
591 | } | |
cfb6eeb4 YH |
592 | if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) { |
593 | keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) * | |
594 | (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC); | |
595 | ||
596 | if (!keys) { | |
597 | tcp_free_md5sig_pool(); | |
598 | kfree(newkey); | |
599 | return -ENOMEM; | |
600 | } | |
601 | ||
602 | if (tp->md5sig_info->entries6) | |
603 | memmove(keys, tp->md5sig_info->keys6, | |
604 | (sizeof (tp->md5sig_info->keys6[0]) * | |
605 | tp->md5sig_info->entries6)); | |
606 | ||
607 | kfree(tp->md5sig_info->keys6); | |
608 | tp->md5sig_info->keys6 = keys; | |
609 | tp->md5sig_info->alloced6++; | |
610 | } | |
611 | ||
612 | ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr, | |
613 | peer); | |
f8ab18d2 DM |
614 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey; |
615 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen; | |
cfb6eeb4 YH |
616 | |
617 | tp->md5sig_info->entries6++; | |
618 | } | |
619 | return 0; | |
620 | } | |
621 | ||
622 | static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk, | |
623 | u8 *newkey, __u8 newkeylen) | |
624 | { | |
625 | return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr, | |
626 | newkey, newkeylen); | |
627 | } | |
628 | ||
629 | static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer) | |
630 | { | |
631 | struct tcp_sock *tp = tcp_sk(sk); | |
632 | int i; | |
633 | ||
634 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 635 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) { |
cfb6eeb4 | 636 | /* Free the key */ |
f8ab18d2 | 637 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
638 | tp->md5sig_info->entries6--; |
639 | ||
640 | if (tp->md5sig_info->entries6 == 0) { | |
641 | kfree(tp->md5sig_info->keys6); | |
642 | tp->md5sig_info->keys6 = NULL; | |
ca983cef | 643 | tp->md5sig_info->alloced6 = 0; |
cfb6eeb4 YH |
644 | } else { |
645 | /* shrink the database */ | |
646 | if (tp->md5sig_info->entries6 != i) | |
647 | memmove(&tp->md5sig_info->keys6[i], | |
648 | &tp->md5sig_info->keys6[i+1], | |
649 | (tp->md5sig_info->entries6 - i) | |
650 | * sizeof (tp->md5sig_info->keys6[0])); | |
651 | } | |
77adefdc YH |
652 | tcp_free_md5sig_pool(); |
653 | return 0; | |
cfb6eeb4 YH |
654 | } |
655 | } | |
656 | return -ENOENT; | |
657 | } | |
658 | ||
659 | static void tcp_v6_clear_md5_list (struct sock *sk) | |
660 | { | |
661 | struct tcp_sock *tp = tcp_sk(sk); | |
662 | int i; | |
663 | ||
664 | if (tp->md5sig_info->entries6) { | |
665 | for (i = 0; i < tp->md5sig_info->entries6; i++) | |
f8ab18d2 | 666 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
667 | tp->md5sig_info->entries6 = 0; |
668 | tcp_free_md5sig_pool(); | |
669 | } | |
670 | ||
671 | kfree(tp->md5sig_info->keys6); | |
672 | tp->md5sig_info->keys6 = NULL; | |
673 | tp->md5sig_info->alloced6 = 0; | |
674 | ||
675 | if (tp->md5sig_info->entries4) { | |
676 | for (i = 0; i < tp->md5sig_info->entries4; i++) | |
f8ab18d2 | 677 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
678 | tp->md5sig_info->entries4 = 0; |
679 | tcp_free_md5sig_pool(); | |
680 | } | |
681 | ||
682 | kfree(tp->md5sig_info->keys4); | |
683 | tp->md5sig_info->keys4 = NULL; | |
684 | tp->md5sig_info->alloced4 = 0; | |
685 | } | |
686 | ||
687 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, | |
688 | int optlen) | |
689 | { | |
690 | struct tcp_md5sig cmd; | |
691 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
692 | u8 *newkey; | |
693 | ||
694 | if (optlen < sizeof(cmd)) | |
695 | return -EINVAL; | |
696 | ||
697 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
698 | return -EFAULT; | |
699 | ||
700 | if (sin6->sin6_family != AF_INET6) | |
701 | return -EINVAL; | |
702 | ||
703 | if (!cmd.tcpm_keylen) { | |
704 | if (!tcp_sk(sk)->md5sig_info) | |
705 | return -ENOENT; | |
e773e4fa | 706 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
cfb6eeb4 YH |
707 | return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]); |
708 | return tcp_v6_md5_do_del(sk, &sin6->sin6_addr); | |
709 | } | |
710 | ||
711 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
712 | return -EINVAL; | |
713 | ||
714 | if (!tcp_sk(sk)->md5sig_info) { | |
715 | struct tcp_sock *tp = tcp_sk(sk); | |
716 | struct tcp_md5sig_info *p; | |
717 | ||
718 | p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL); | |
719 | if (!p) | |
720 | return -ENOMEM; | |
721 | ||
722 | tp->md5sig_info = p; | |
3d7dbeac | 723 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 YH |
724 | } |
725 | ||
af879cc7 | 726 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
727 | if (!newkey) |
728 | return -ENOMEM; | |
e773e4fa | 729 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { |
cfb6eeb4 YH |
730 | return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3], |
731 | newkey, cmd.tcpm_keylen); | |
732 | } | |
733 | return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen); | |
734 | } | |
735 | ||
736 | static int tcp_v6_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, | |
737 | struct in6_addr *saddr, | |
738 | struct in6_addr *daddr, | |
076fb722 | 739 | struct tcphdr *th, unsigned int tcplen) |
cfb6eeb4 | 740 | { |
cfb6eeb4 YH |
741 | struct tcp_md5sig_pool *hp; |
742 | struct tcp6_pseudohdr *bp; | |
cfb6eeb4 | 743 | int err; |
cfb6eeb4 YH |
744 | |
745 | hp = tcp_get_md5sig_pool(); | |
746 | if (!hp) { | |
0dc47877 | 747 | printk(KERN_WARNING "%s(): hash pool not found...\n", __func__); |
cfb6eeb4 YH |
748 | goto clear_hash_noput; |
749 | } | |
8d26d76d | 750 | |
cfb6eeb4 | 751 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 YH |
752 | |
753 | /* 1. TCP pseudo-header (RFC2460) */ | |
754 | ipv6_addr_copy(&bp->saddr, saddr); | |
755 | ipv6_addr_copy(&bp->daddr, daddr); | |
756 | bp->len = htonl(tcplen); | |
076fb722 | 757 | bp->protocol = htonl(IPPROTO_TCP); |
cfb6eeb4 | 758 | |
8d26d76d YH |
759 | err = tcp_calc_md5_hash(md5_hash, key, sizeof(*bp), |
760 | th, tcplen, hp); | |
c7da57a1 | 761 | |
8d26d76d | 762 | if (err) |
cfb6eeb4 | 763 | goto clear_hash; |
cfb6eeb4 | 764 | |
8d26d76d | 765 | /* Free up the crypto pool */ |
cfb6eeb4 | 766 | tcp_put_md5sig_pool(); |
cfb6eeb4 YH |
767 | out: |
768 | return 0; | |
769 | clear_hash: | |
770 | tcp_put_md5sig_pool(); | |
771 | clear_hash_noput: | |
772 | memset(md5_hash, 0, 16); | |
773 | goto out; | |
774 | } | |
775 | ||
776 | static int tcp_v6_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, | |
777 | struct sock *sk, | |
778 | struct dst_entry *dst, | |
779 | struct request_sock *req, | |
076fb722 | 780 | struct tcphdr *th, unsigned int tcplen) |
cfb6eeb4 YH |
781 | { |
782 | struct in6_addr *saddr, *daddr; | |
783 | ||
784 | if (sk) { | |
785 | saddr = &inet6_sk(sk)->saddr; | |
786 | daddr = &inet6_sk(sk)->daddr; | |
787 | } else { | |
788 | saddr = &inet6_rsk(req)->loc_addr; | |
789 | daddr = &inet6_rsk(req)->rmt_addr; | |
790 | } | |
791 | return tcp_v6_do_calc_md5_hash(md5_hash, key, | |
792 | saddr, daddr, | |
076fb722 | 793 | th, tcplen); |
cfb6eeb4 YH |
794 | } |
795 | ||
796 | static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb) | |
797 | { | |
798 | __u8 *hash_location = NULL; | |
799 | struct tcp_md5sig_key *hash_expected; | |
0660e03f | 800 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
aa8223c7 | 801 | struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 802 | int genhash; |
cfb6eeb4 YH |
803 | u8 newhash[16]; |
804 | ||
805 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 806 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 807 | |
cfb6eeb4 YH |
808 | /* do we have a hash as expected? */ |
809 | if (!hash_expected) { | |
810 | if (!hash_location) | |
811 | return 0; | |
812 | if (net_ratelimit()) { | |
813 | printk(KERN_INFO "MD5 Hash NOT expected but found " | |
814 | "(" NIP6_FMT ", %u)->" | |
815 | "(" NIP6_FMT ", %u)\n", | |
816 | NIP6(ip6h->saddr), ntohs(th->source), | |
817 | NIP6(ip6h->daddr), ntohs(th->dest)); | |
818 | } | |
819 | return 1; | |
820 | } | |
821 | ||
822 | if (!hash_location) { | |
823 | if (net_ratelimit()) { | |
824 | printk(KERN_INFO "MD5 Hash expected but NOT found " | |
825 | "(" NIP6_FMT ", %u)->" | |
826 | "(" NIP6_FMT ", %u)\n", | |
827 | NIP6(ip6h->saddr), ntohs(th->source), | |
828 | NIP6(ip6h->daddr), ntohs(th->dest)); | |
829 | } | |
830 | return 1; | |
831 | } | |
832 | ||
833 | /* check the signature */ | |
834 | genhash = tcp_v6_do_calc_md5_hash(newhash, | |
835 | hash_expected, | |
836 | &ip6h->saddr, &ip6h->daddr, | |
076fb722 | 837 | th, skb->len); |
cfb6eeb4 YH |
838 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
839 | if (net_ratelimit()) { | |
840 | printk(KERN_INFO "MD5 Hash %s for " | |
841 | "(" NIP6_FMT ", %u)->" | |
842 | "(" NIP6_FMT ", %u)\n", | |
843 | genhash ? "failed" : "mismatch", | |
844 | NIP6(ip6h->saddr), ntohs(th->source), | |
845 | NIP6(ip6h->daddr), ntohs(th->dest)); | |
846 | } | |
847 | return 1; | |
848 | } | |
849 | return 0; | |
850 | } | |
851 | #endif | |
852 | ||
c6aefafb | 853 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 854 | .family = AF_INET6, |
2e6599cb | 855 | .obj_size = sizeof(struct tcp6_request_sock), |
1da177e4 | 856 | .rtx_syn_ack = tcp_v6_send_synack, |
60236fdd ACM |
857 | .send_ack = tcp_v6_reqsk_send_ack, |
858 | .destructor = tcp_v6_reqsk_destructor, | |
1da177e4 LT |
859 | .send_reset = tcp_v6_send_reset |
860 | }; | |
861 | ||
cfb6eeb4 | 862 | #ifdef CONFIG_TCP_MD5SIG |
b6332e6c | 863 | static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 864 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
cfb6eeb4 | 865 | }; |
b6332e6c | 866 | #endif |
cfb6eeb4 | 867 | |
6d6ee43e ACM |
868 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
869 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
870 | .twsk_unique = tcp_twsk_unique, | |
cfb6eeb4 | 871 | .twsk_destructor= tcp_twsk_destructor, |
6d6ee43e ACM |
872 | }; |
873 | ||
8292a17a | 874 | static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) |
1da177e4 LT |
875 | { |
876 | struct ipv6_pinfo *np = inet6_sk(sk); | |
aa8223c7 | 877 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 878 | |
84fa7933 | 879 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1da177e4 | 880 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); |
663ead3b | 881 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 882 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 883 | } else { |
1ab1457c YH |
884 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, |
885 | csum_partial((char *)th, th->doff<<2, | |
1da177e4 LT |
886 | skb->csum)); |
887 | } | |
888 | } | |
889 | ||
a430a43d HX |
890 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
891 | { | |
892 | struct ipv6hdr *ipv6h; | |
893 | struct tcphdr *th; | |
894 | ||
895 | if (!pskb_may_pull(skb, sizeof(*th))) | |
896 | return -EINVAL; | |
897 | ||
0660e03f | 898 | ipv6h = ipv6_hdr(skb); |
aa8223c7 | 899 | th = tcp_hdr(skb); |
a430a43d HX |
900 | |
901 | th->check = 0; | |
902 | th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, | |
903 | IPPROTO_TCP, 0); | |
663ead3b | 904 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 905 | skb->csum_offset = offsetof(struct tcphdr, check); |
84fa7933 | 906 | skb->ip_summed = CHECKSUM_PARTIAL; |
a430a43d HX |
907 | return 0; |
908 | } | |
1da177e4 | 909 | |
cfb6eeb4 | 910 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 911 | { |
aa8223c7 | 912 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
913 | struct sk_buff *buff; |
914 | struct flowi fl; | |
c346dca1 | 915 | struct net *net = dev_net(skb->dst->dev); |
e5047992 | 916 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
9cb5734e | 917 | unsigned int tot_len = sizeof(*th); |
cfb6eeb4 YH |
918 | #ifdef CONFIG_TCP_MD5SIG |
919 | struct tcp_md5sig_key *key; | |
920 | #endif | |
1da177e4 LT |
921 | |
922 | if (th->rst) | |
923 | return; | |
924 | ||
925 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 926 | return; |
1da177e4 | 927 | |
cfb6eeb4 YH |
928 | #ifdef CONFIG_TCP_MD5SIG |
929 | if (sk) | |
0660e03f | 930 | key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr); |
cfb6eeb4 YH |
931 | else |
932 | key = NULL; | |
933 | ||
934 | if (key) | |
935 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
936 | #endif | |
937 | ||
1da177e4 LT |
938 | /* |
939 | * We need to grab some memory, and put together an RST, | |
940 | * and then put it into the queue to be sent. | |
941 | */ | |
942 | ||
cfb6eeb4 | 943 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 944 | GFP_ATOMIC); |
1ab1457c YH |
945 | if (buff == NULL) |
946 | return; | |
1da177e4 | 947 | |
cfb6eeb4 | 948 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 949 | |
cfb6eeb4 | 950 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
1da177e4 LT |
951 | |
952 | /* Swap the send and the receive. */ | |
953 | memset(t1, 0, sizeof(*t1)); | |
954 | t1->dest = th->source; | |
955 | t1->source = th->dest; | |
cfb6eeb4 | 956 | t1->doff = tot_len / 4; |
1da177e4 | 957 | t1->rst = 1; |
1ab1457c | 958 | |
1da177e4 | 959 | if(th->ack) { |
1ab1457c | 960 | t1->seq = th->ack_seq; |
1da177e4 LT |
961 | } else { |
962 | t1->ack = 1; | |
963 | t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin | |
964 | + skb->len - (th->doff<<2)); | |
965 | } | |
966 | ||
cfb6eeb4 YH |
967 | #ifdef CONFIG_TCP_MD5SIG |
968 | if (key) { | |
8e5200f5 | 969 | __be32 *opt = (__be32*)(t1 + 1); |
cfb6eeb4 YH |
970 | opt[0] = htonl((TCPOPT_NOP << 24) | |
971 | (TCPOPT_NOP << 16) | | |
972 | (TCPOPT_MD5SIG << 8) | | |
973 | TCPOLEN_MD5SIG); | |
0660e03f ACM |
974 | tcp_v6_do_calc_md5_hash((__u8 *)&opt[1], key, |
975 | &ipv6_hdr(skb)->daddr, | |
976 | &ipv6_hdr(skb)->saddr, | |
076fb722 | 977 | t1, tot_len); |
cfb6eeb4 YH |
978 | } |
979 | #endif | |
980 | ||
1da177e4 LT |
981 | buff->csum = csum_partial((char *)t1, sizeof(*t1), 0); |
982 | ||
983 | memset(&fl, 0, sizeof(fl)); | |
0660e03f ACM |
984 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
985 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
986 | |
987 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
988 | sizeof(*t1), IPPROTO_TCP, | |
989 | buff->csum); | |
990 | ||
991 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 992 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
993 | fl.fl_ip_dport = t1->dest; |
994 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 995 | security_skb_classify_flow(skb, &fl); |
1da177e4 | 996 | |
c20121ae DL |
997 | /* Pass a socket to ip6_dst_lookup either it is for RST |
998 | * Underlying function will use this to retrieve the network | |
999 | * namespace | |
1000 | */ | |
e5047992 | 1001 | if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) { |
1da177e4 | 1002 | |
ecc51b6d | 1003 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
e5047992 | 1004 | ip6_xmit(ctl_sk, buff, &fl, NULL, 0); |
ecc51b6d ACM |
1005 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); |
1006 | TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); | |
1da177e4 | 1007 | return; |
ecc51b6d | 1008 | } |
1da177e4 LT |
1009 | } |
1010 | ||
1011 | kfree_skb(buff); | |
1012 | } | |
1013 | ||
cfb6eeb4 YH |
1014 | static void tcp_v6_send_ack(struct tcp_timewait_sock *tw, |
1015 | struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts) | |
1da177e4 | 1016 | { |
aa8223c7 | 1017 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
1018 | struct sk_buff *buff; |
1019 | struct flowi fl; | |
c346dca1 | 1020 | struct net *net = dev_net(skb->dev); |
e5047992 | 1021 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
9cb5734e | 1022 | unsigned int tot_len = sizeof(struct tcphdr); |
e69a4adc | 1023 | __be32 *topt; |
cfb6eeb4 YH |
1024 | #ifdef CONFIG_TCP_MD5SIG |
1025 | struct tcp_md5sig_key *key; | |
1026 | struct tcp_md5sig_key tw_key; | |
1027 | #endif | |
1028 | ||
1029 | #ifdef CONFIG_TCP_MD5SIG | |
1030 | if (!tw && skb->sk) { | |
0660e03f | 1031 | key = tcp_v6_md5_do_lookup(skb->sk, &ipv6_hdr(skb)->daddr); |
cfb6eeb4 YH |
1032 | } else if (tw && tw->tw_md5_keylen) { |
1033 | tw_key.key = tw->tw_md5_key; | |
1034 | tw_key.keylen = tw->tw_md5_keylen; | |
1035 | key = &tw_key; | |
1036 | } else { | |
1037 | key = NULL; | |
1038 | } | |
1039 | #endif | |
1da177e4 LT |
1040 | |
1041 | if (ts) | |
4244f8a9 | 1042 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 YH |
1043 | #ifdef CONFIG_TCP_MD5SIG |
1044 | if (key) | |
1045 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
1046 | #endif | |
1da177e4 LT |
1047 | |
1048 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, | |
1049 | GFP_ATOMIC); | |
1050 | if (buff == NULL) | |
1051 | return; | |
1052 | ||
1053 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); | |
1054 | ||
1055 | t1 = (struct tcphdr *) skb_push(buff,tot_len); | |
1056 | ||
1057 | /* Swap the send and the receive. */ | |
1058 | memset(t1, 0, sizeof(*t1)); | |
1059 | t1->dest = th->source; | |
1060 | t1->source = th->dest; | |
1061 | t1->doff = tot_len/4; | |
1062 | t1->seq = htonl(seq); | |
1063 | t1->ack_seq = htonl(ack); | |
1064 | t1->ack = 1; | |
1065 | t1->window = htons(win); | |
cfb6eeb4 | 1066 | |
e69a4adc | 1067 | topt = (__be32 *)(t1 + 1); |
1ab1457c | 1068 | |
1da177e4 | 1069 | if (ts) { |
cfb6eeb4 YH |
1070 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
1071 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
1072 | *topt++ = htonl(tcp_time_stamp); | |
1073 | *topt = htonl(ts); | |
1da177e4 LT |
1074 | } |
1075 | ||
cfb6eeb4 YH |
1076 | #ifdef CONFIG_TCP_MD5SIG |
1077 | if (key) { | |
1078 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
1079 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
0660e03f ACM |
1080 | tcp_v6_do_calc_md5_hash((__u8 *)topt, key, |
1081 | &ipv6_hdr(skb)->daddr, | |
1082 | &ipv6_hdr(skb)->saddr, | |
076fb722 | 1083 | t1, tot_len); |
cfb6eeb4 YH |
1084 | } |
1085 | #endif | |
1086 | ||
1da177e4 LT |
1087 | buff->csum = csum_partial((char *)t1, tot_len, 0); |
1088 | ||
1089 | memset(&fl, 0, sizeof(fl)); | |
0660e03f ACM |
1090 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
1091 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1092 | |
1093 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
1094 | tot_len, IPPROTO_TCP, | |
1095 | buff->csum); | |
1096 | ||
1097 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 1098 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
1099 | fl.fl_ip_dport = t1->dest; |
1100 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 1101 | security_skb_classify_flow(skb, &fl); |
1da177e4 | 1102 | |
e5047992 | 1103 | if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) { |
ecc51b6d | 1104 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
e5047992 | 1105 | ip6_xmit(ctl_sk, buff, &fl, NULL, 0); |
ecc51b6d | 1106 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); |
1da177e4 | 1107 | return; |
ecc51b6d | 1108 | } |
1da177e4 LT |
1109 | } |
1110 | ||
1111 | kfree_skb(buff); | |
1112 | } | |
1113 | ||
1114 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1115 | { | |
8feaf0c0 | 1116 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 1117 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 1118 | |
cfb6eeb4 | 1119 | tcp_v6_send_ack(tcptw, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 ACM |
1120 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
1121 | tcptw->tw_ts_recent); | |
1da177e4 | 1122 | |
8feaf0c0 | 1123 | inet_twsk_put(tw); |
1da177e4 LT |
1124 | } |
1125 | ||
60236fdd | 1126 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req) |
1da177e4 | 1127 | { |
cfb6eeb4 | 1128 | tcp_v6_send_ack(NULL, skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent); |
1da177e4 LT |
1129 | } |
1130 | ||
1131 | ||
1132 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
1133 | { | |
60236fdd | 1134 | struct request_sock *req, **prev; |
aa8223c7 | 1135 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
1136 | struct sock *nsk; |
1137 | ||
1138 | /* Find possible connection requests. */ | |
8129765a | 1139 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
1140 | &ipv6_hdr(skb)->saddr, |
1141 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 LT |
1142 | if (req) |
1143 | return tcp_check_req(sk, skb, req, prev); | |
1144 | ||
3b1e0a65 | 1145 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
1146 | &ipv6_hdr(skb)->saddr, th->source, |
1147 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
1148 | |
1149 | if (nsk) { | |
1150 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1151 | bh_lock_sock(nsk); | |
1152 | return nsk; | |
1153 | } | |
9469c7b4 | 1154 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1155 | return NULL; |
1156 | } | |
1157 | ||
c6aefafb | 1158 | #ifdef CONFIG_SYN_COOKIES |
1da177e4 | 1159 | if (!th->rst && !th->syn && th->ack) |
c6aefafb | 1160 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1161 | #endif |
1162 | return sk; | |
1163 | } | |
1164 | ||
1da177e4 LT |
1165 | /* FIXME: this is substantially similar to the ipv4 code. |
1166 | * Can some kind of merge be done? -- erics | |
1167 | */ | |
1168 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1169 | { | |
ca304b61 | 1170 | struct inet6_request_sock *treq; |
1da177e4 LT |
1171 | struct ipv6_pinfo *np = inet6_sk(sk); |
1172 | struct tcp_options_received tmp_opt; | |
1173 | struct tcp_sock *tp = tcp_sk(sk); | |
60236fdd | 1174 | struct request_sock *req = NULL; |
1da177e4 | 1175 | __u32 isn = TCP_SKB_CB(skb)->when; |
c6aefafb GG |
1176 | #ifdef CONFIG_SYN_COOKIES |
1177 | int want_cookie = 0; | |
1178 | #else | |
1179 | #define want_cookie 0 | |
1180 | #endif | |
1da177e4 LT |
1181 | |
1182 | if (skb->protocol == htons(ETH_P_IP)) | |
1183 | return tcp_v4_conn_request(sk, skb); | |
1184 | ||
1185 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1186 | goto drop; |
1da177e4 | 1187 | |
463c84b9 | 1188 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 | 1189 | if (net_ratelimit()) |
c6aefafb GG |
1190 | syn_flood_warning(skb); |
1191 | #ifdef CONFIG_SYN_COOKIES | |
1192 | if (sysctl_tcp_syncookies) | |
1193 | want_cookie = 1; | |
1194 | else | |
1195 | #endif | |
1ab1457c | 1196 | goto drop; |
1da177e4 LT |
1197 | } |
1198 | ||
463c84b9 | 1199 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1200 | goto drop; |
1201 | ||
ca304b61 | 1202 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1203 | if (req == NULL) |
1204 | goto drop; | |
1205 | ||
cfb6eeb4 YH |
1206 | #ifdef CONFIG_TCP_MD5SIG |
1207 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
1208 | #endif | |
1209 | ||
1da177e4 LT |
1210 | tcp_clear_options(&tmp_opt); |
1211 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1212 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
1213 | ||
1214 | tcp_parse_options(skb, &tmp_opt, 0); | |
1215 | ||
4dfc2817 | 1216 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 1217 | tcp_clear_options(&tmp_opt); |
c6aefafb | 1218 | |
1da177e4 LT |
1219 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1220 | tcp_openreq_init(req, &tmp_opt, skb); | |
1221 | ||
ca304b61 | 1222 | treq = inet6_rsk(req); |
0660e03f ACM |
1223 | ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr); |
1224 | ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr); | |
2e6599cb | 1225 | treq->pktopts = NULL; |
c6aefafb GG |
1226 | if (!want_cookie) |
1227 | TCP_ECN_create_request(req, tcp_hdr(skb)); | |
1228 | ||
1229 | if (want_cookie) { | |
1230 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); | |
4dfc2817 | 1231 | req->cookie_ts = tmp_opt.tstamp_ok; |
c6aefafb GG |
1232 | } else if (!isn) { |
1233 | if (ipv6_opt_accepted(sk, skb) || | |
1234 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1235 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1236 | atomic_inc(&skb->users); | |
1237 | treq->pktopts = skb; | |
1238 | } | |
1239 | treq->iif = sk->sk_bound_dev_if; | |
1da177e4 | 1240 | |
c6aefafb GG |
1241 | /* So that link locals have meaning */ |
1242 | if (!sk->sk_bound_dev_if && | |
1243 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1244 | treq->iif = inet6_iif(skb); | |
1da177e4 | 1245 | |
a94f723d | 1246 | isn = tcp_v6_init_sequence(skb); |
c6aefafb | 1247 | } |
1da177e4 | 1248 | |
2e6599cb | 1249 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1250 | |
4237c75c VY |
1251 | security_inet_conn_request(sk, skb, req); |
1252 | ||
fd80eb94 | 1253 | if (tcp_v6_send_synack(sk, req)) |
1da177e4 LT |
1254 | goto drop; |
1255 | ||
c6aefafb GG |
1256 | if (!want_cookie) { |
1257 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); | |
1258 | return 0; | |
1259 | } | |
1da177e4 LT |
1260 | |
1261 | drop: | |
1262 | if (req) | |
60236fdd | 1263 | reqsk_free(req); |
1da177e4 | 1264 | |
1da177e4 LT |
1265 | return 0; /* don't send reset */ |
1266 | } | |
1267 | ||
1268 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1269 | struct request_sock *req, |
1da177e4 LT |
1270 | struct dst_entry *dst) |
1271 | { | |
ca304b61 | 1272 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
1273 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1274 | struct tcp6_sock *newtcp6sk; | |
1275 | struct inet_sock *newinet; | |
1276 | struct tcp_sock *newtp; | |
1277 | struct sock *newsk; | |
1278 | struct ipv6_txoptions *opt; | |
cfb6eeb4 YH |
1279 | #ifdef CONFIG_TCP_MD5SIG |
1280 | struct tcp_md5sig_key *key; | |
1281 | #endif | |
1da177e4 LT |
1282 | |
1283 | if (skb->protocol == htons(ETH_P_IP)) { | |
1284 | /* | |
1285 | * v6 mapped | |
1286 | */ | |
1287 | ||
1288 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1289 | ||
1ab1457c | 1290 | if (newsk == NULL) |
1da177e4 LT |
1291 | return NULL; |
1292 | ||
1293 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1294 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1295 | ||
1296 | newinet = inet_sk(newsk); | |
1297 | newnp = inet6_sk(newsk); | |
1298 | newtp = tcp_sk(newsk); | |
1299 | ||
1300 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1301 | ||
1302 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
1303 | newinet->daddr); | |
1304 | ||
1305 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
1306 | newinet->saddr); | |
1307 | ||
1308 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1309 | ||
8292a17a | 1310 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1311 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1312 | #ifdef CONFIG_TCP_MD5SIG |
1313 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1314 | #endif | |
1315 | ||
1da177e4 LT |
1316 | newnp->pktoptions = NULL; |
1317 | newnp->opt = NULL; | |
505cbfc5 | 1318 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1319 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 | 1320 | |
e6848976 ACM |
1321 | /* |
1322 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1323 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1324 | * that function for the gory details. -acme | |
1da177e4 | 1325 | */ |
1da177e4 LT |
1326 | |
1327 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1328 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1329 | Sync it now. |
1330 | */ | |
d83d8461 | 1331 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1332 | |
1333 | return newsk; | |
1334 | } | |
1335 | ||
1336 | opt = np->opt; | |
1337 | ||
1338 | if (sk_acceptq_is_full(sk)) | |
1339 | goto out_overflow; | |
1340 | ||
1da177e4 LT |
1341 | if (dst == NULL) { |
1342 | struct in6_addr *final_p = NULL, final; | |
1343 | struct flowi fl; | |
1344 | ||
1345 | memset(&fl, 0, sizeof(fl)); | |
1346 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1347 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
1348 | if (opt && opt->srcrt) { |
1349 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1350 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1351 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1352 | final_p = &final; | |
1353 | } | |
2e6599cb | 1354 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1355 | fl.oif = sk->sk_bound_dev_if; |
2e6599cb | 1356 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
1da177e4 | 1357 | fl.fl_ip_sport = inet_sk(sk)->sport; |
4237c75c | 1358 | security_req_classify_flow(req, &fl); |
1da177e4 LT |
1359 | |
1360 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1361 | goto out; | |
1362 | ||
1363 | if (final_p) | |
1364 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1365 | ||
1366 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
1367 | goto out; | |
1ab1457c | 1368 | } |
1da177e4 LT |
1369 | |
1370 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1371 | if (newsk == NULL) | |
1372 | goto out; | |
1373 | ||
e6848976 ACM |
1374 | /* |
1375 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1376 | * count here, tcp_create_openreq_child now does this for us, see the | |
1377 | * comment in that function for the gory details. -acme | |
1378 | */ | |
1da177e4 | 1379 | |
59eed279 | 1380 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1381 | __ip6_dst_store(newsk, dst, NULL, NULL); |
1da177e4 LT |
1382 | |
1383 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1384 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1385 | ||
1386 | newtp = tcp_sk(newsk); | |
1387 | newinet = inet_sk(newsk); | |
1388 | newnp = inet6_sk(newsk); | |
1389 | ||
1390 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1391 | ||
2e6599cb ACM |
1392 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1393 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1394 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1395 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 | 1396 | |
1ab1457c | 1397 | /* Now IPv6 options... |
1da177e4 LT |
1398 | |
1399 | First: no IPv4 options. | |
1400 | */ | |
1401 | newinet->opt = NULL; | |
d35690be | 1402 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1403 | |
1404 | /* Clone RX bits */ | |
1405 | newnp->rxopt.all = np->rxopt.all; | |
1406 | ||
1407 | /* Clone pktoptions received with SYN */ | |
1408 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1409 | if (treq->pktopts != NULL) { |
1410 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1411 | kfree_skb(treq->pktopts); | |
1412 | treq->pktopts = NULL; | |
1da177e4 LT |
1413 | if (newnp->pktoptions) |
1414 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1415 | } | |
1416 | newnp->opt = NULL; | |
505cbfc5 | 1417 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1418 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
1419 | |
1420 | /* Clone native IPv6 options from listening socket (if any) | |
1421 | ||
1422 | Yes, keeping reference count would be much more clever, | |
1423 | but we make one more one thing there: reattach optmem | |
1424 | to newsk. | |
1425 | */ | |
1426 | if (opt) { | |
1427 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1428 | if (opt != np->opt) | |
1429 | sock_kfree_s(sk, opt, opt->tot_len); | |
1430 | } | |
1431 | ||
d83d8461 | 1432 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1433 | if (newnp->opt) |
d83d8461 ACM |
1434 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1435 | newnp->opt->opt_flen); | |
1da177e4 | 1436 | |
5d424d5a | 1437 | tcp_mtup_init(newsk); |
1da177e4 LT |
1438 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1439 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1440 | tcp_initialize_rcv_mss(newsk); | |
1441 | ||
1442 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
1443 | ||
cfb6eeb4 YH |
1444 | #ifdef CONFIG_TCP_MD5SIG |
1445 | /* Copy over the MD5 key from the original socket */ | |
1446 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1447 | /* We're using one, so create a matching key | |
1448 | * on the newsk structure. If we fail to get | |
1449 | * memory, then we end up not copying the key | |
1450 | * across. Shucks. | |
1451 | */ | |
af879cc7 ACM |
1452 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1453 | if (newkey != NULL) | |
cfb6eeb4 YH |
1454 | tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr, |
1455 | newkey, key->keylen); | |
cfb6eeb4 YH |
1456 | } |
1457 | #endif | |
1458 | ||
ab1e0a13 | 1459 | __inet6_hash(newsk); |
e56d8b8a | 1460 | __inet_inherit_port(sk, newsk); |
1da177e4 LT |
1461 | |
1462 | return newsk; | |
1463 | ||
1464 | out_overflow: | |
1465 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
1466 | out: | |
1467 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
1468 | if (opt && opt != np->opt) | |
1469 | sock_kfree_s(sk, opt, opt->tot_len); | |
1470 | dst_release(dst); | |
1471 | return NULL; | |
1472 | } | |
1473 | ||
b51655b9 | 1474 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1475 | { |
84fa7933 | 1476 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
aa8223c7 | 1477 | if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1478 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1479 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1480 | return 0; |
fb286bb2 | 1481 | } |
1da177e4 | 1482 | } |
fb286bb2 | 1483 | |
aa8223c7 | 1484 | skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len, |
0660e03f ACM |
1485 | &ipv6_hdr(skb)->saddr, |
1486 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1487 | |
1da177e4 | 1488 | if (skb->len <= 76) { |
fb286bb2 | 1489 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1490 | } |
1491 | return 0; | |
1492 | } | |
1493 | ||
1494 | /* The socket must have it's spinlock held when we get | |
1495 | * here. | |
1496 | * | |
1497 | * We have a potential double-lock case here, so even when | |
1498 | * doing backlog processing we use the BH locking scheme. | |
1499 | * This is because we cannot sleep with the original spinlock | |
1500 | * held. | |
1501 | */ | |
1502 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1503 | { | |
1504 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1505 | struct tcp_sock *tp; | |
1506 | struct sk_buff *opt_skb = NULL; | |
1507 | ||
1508 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1509 | goes to IPv4 receive handler and backlogged. | |
1510 | From backlog it always goes here. Kerboom... | |
1511 | Fortunately, tcp_rcv_established and rcv_established | |
1512 | handle them correctly, but it is not case with | |
1513 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1514 | */ | |
1515 | ||
1516 | if (skb->protocol == htons(ETH_P_IP)) | |
1517 | return tcp_v4_do_rcv(sk, skb); | |
1518 | ||
cfb6eeb4 YH |
1519 | #ifdef CONFIG_TCP_MD5SIG |
1520 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1521 | goto discard; | |
1522 | #endif | |
1523 | ||
fda9ef5d | 1524 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1525 | goto discard; |
1526 | ||
1527 | /* | |
1528 | * socket locking is here for SMP purposes as backlog rcv | |
1529 | * is currently called with bh processing disabled. | |
1530 | */ | |
1531 | ||
1532 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1533 | ||
1534 | Yes, guys, it is the only place in our code, where we | |
1535 | may make it not affecting IPv4. | |
1536 | The rest of code is protocol independent, | |
1537 | and I do not like idea to uglify IPv4. | |
1538 | ||
1539 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1540 | looks not very well thought. For now we latch | |
1541 | options, received in the last packet, enqueued | |
1542 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1543 | --ANK (980728) |
1da177e4 LT |
1544 | */ |
1545 | if (np->rxopt.all) | |
1546 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1547 | ||
1548 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1549 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1550 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1551 | goto reset; |
1552 | TCP_CHECK_TIMER(sk); | |
1553 | if (opt_skb) | |
1554 | goto ipv6_pktoptions; | |
1555 | return 0; | |
1556 | } | |
1557 | ||
ab6a5bb6 | 1558 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1559 | goto csum_err; |
1560 | ||
1ab1457c | 1561 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1562 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1563 | if (!nsk) | |
1564 | goto discard; | |
1565 | ||
1566 | /* | |
1567 | * Queue it on the new socket if the new socket is active, | |
1568 | * otherwise we just shortcircuit this and continue with | |
1569 | * the new socket.. | |
1570 | */ | |
1ab1457c | 1571 | if(nsk != sk) { |
1da177e4 LT |
1572 | if (tcp_child_process(sk, nsk, skb)) |
1573 | goto reset; | |
1574 | if (opt_skb) | |
1575 | __kfree_skb(opt_skb); | |
1576 | return 0; | |
1577 | } | |
1578 | } | |
1579 | ||
1580 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1581 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1582 | goto reset; |
1583 | TCP_CHECK_TIMER(sk); | |
1584 | if (opt_skb) | |
1585 | goto ipv6_pktoptions; | |
1586 | return 0; | |
1587 | ||
1588 | reset: | |
cfb6eeb4 | 1589 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1590 | discard: |
1591 | if (opt_skb) | |
1592 | __kfree_skb(opt_skb); | |
1593 | kfree_skb(skb); | |
1594 | return 0; | |
1595 | csum_err: | |
1596 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1597 | goto discard; | |
1598 | ||
1599 | ||
1600 | ipv6_pktoptions: | |
1601 | /* Do you ask, what is it? | |
1602 | ||
1603 | 1. skb was enqueued by tcp. | |
1604 | 2. skb is added to tail of read queue, rather than out of order. | |
1605 | 3. socket is not in passive state. | |
1606 | 4. Finally, it really contains options, which user wants to receive. | |
1607 | */ | |
1608 | tp = tcp_sk(sk); | |
1609 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1610 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1611 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1612 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1613 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1614 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
1da177e4 LT |
1615 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1616 | skb_set_owner_r(opt_skb, sk); | |
1617 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1618 | } else { | |
1619 | __kfree_skb(opt_skb); | |
1620 | opt_skb = xchg(&np->pktoptions, NULL); | |
1621 | } | |
1622 | } | |
1623 | ||
1624 | if (opt_skb) | |
1625 | kfree_skb(opt_skb); | |
1626 | return 0; | |
1627 | } | |
1628 | ||
e5bbef20 | 1629 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1630 | { |
1ab1457c | 1631 | struct tcphdr *th; |
1da177e4 LT |
1632 | struct sock *sk; |
1633 | int ret; | |
1634 | ||
1635 | if (skb->pkt_type != PACKET_HOST) | |
1636 | goto discard_it; | |
1637 | ||
1638 | /* | |
1639 | * Count it even if it's bad. | |
1640 | */ | |
1641 | TCP_INC_STATS_BH(TCP_MIB_INSEGS); | |
1642 | ||
1643 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1644 | goto discard_it; | |
1645 | ||
aa8223c7 | 1646 | th = tcp_hdr(skb); |
1da177e4 LT |
1647 | |
1648 | if (th->doff < sizeof(struct tcphdr)/4) | |
1649 | goto bad_packet; | |
1650 | if (!pskb_may_pull(skb, th->doff*4)) | |
1651 | goto discard_it; | |
1652 | ||
60476372 | 1653 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1da177e4 LT |
1654 | goto bad_packet; |
1655 | ||
aa8223c7 | 1656 | th = tcp_hdr(skb); |
1da177e4 LT |
1657 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1658 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1659 | skb->len - th->doff*4); | |
1660 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1661 | TCP_SKB_CB(skb)->when = 0; | |
0660e03f | 1662 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 LT |
1663 | TCP_SKB_CB(skb)->sacked = 0; |
1664 | ||
c346dca1 | 1665 | sk = __inet6_lookup(dev_net(skb->dev), &tcp_hashinfo, |
d86e0dac PE |
1666 | &ipv6_hdr(skb)->saddr, th->source, |
1667 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), | |
1668 | inet6_iif(skb)); | |
1da177e4 LT |
1669 | |
1670 | if (!sk) | |
1671 | goto no_tcp_socket; | |
1672 | ||
1673 | process: | |
1674 | if (sk->sk_state == TCP_TIME_WAIT) | |
1675 | goto do_time_wait; | |
1676 | ||
1677 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1678 | goto discard_and_relse; | |
1679 | ||
fda9ef5d | 1680 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1681 | goto discard_and_relse; |
1682 | ||
1683 | skb->dev = NULL; | |
1684 | ||
293b9c42 | 1685 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1686 | ret = 0; |
1687 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1688 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1689 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a DM |
1690 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
1691 | tp->ucopy.dma_chan = get_softnet_dma(); | |
1ab1457c YH |
1692 | if (tp->ucopy.dma_chan) |
1693 | ret = tcp_v6_do_rcv(sk, skb); | |
1694 | else | |
1a2449a8 CL |
1695 | #endif |
1696 | { | |
1697 | if (!tcp_prequeue(sk, skb)) | |
1698 | ret = tcp_v6_do_rcv(sk, skb); | |
1699 | } | |
1da177e4 LT |
1700 | } else |
1701 | sk_add_backlog(sk, skb); | |
1702 | bh_unlock_sock(sk); | |
1703 | ||
1704 | sock_put(sk); | |
1705 | return ret ? -1 : 0; | |
1706 | ||
1707 | no_tcp_socket: | |
1708 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1709 | goto discard_it; | |
1710 | ||
1711 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1712 | bad_packet: | |
1713 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1714 | } else { | |
cfb6eeb4 | 1715 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1716 | } |
1717 | ||
1718 | discard_it: | |
1719 | ||
1720 | /* | |
1721 | * Discard frame | |
1722 | */ | |
1723 | ||
1724 | kfree_skb(skb); | |
1725 | return 0; | |
1726 | ||
1727 | discard_and_relse: | |
1728 | sock_put(sk); | |
1729 | goto discard_it; | |
1730 | ||
1731 | do_time_wait: | |
1732 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1733 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1734 | goto discard_it; |
1735 | } | |
1736 | ||
1737 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1738 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
9469c7b4 | 1739 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1740 | goto discard_it; |
1741 | } | |
1742 | ||
9469c7b4 | 1743 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1744 | case TCP_TW_SYN: |
1745 | { | |
1746 | struct sock *sk2; | |
1747 | ||
c346dca1 | 1748 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
0660e03f | 1749 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1750 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1751 | if (sk2 != NULL) { |
295ff7ed ACM |
1752 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1753 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1754 | inet_twsk_put(tw); | |
1da177e4 LT |
1755 | sk = sk2; |
1756 | goto process; | |
1757 | } | |
1758 | /* Fall through to ACK */ | |
1759 | } | |
1760 | case TCP_TW_ACK: | |
1761 | tcp_v6_timewait_ack(sk, skb); | |
1762 | break; | |
1763 | case TCP_TW_RST: | |
1764 | goto no_tcp_socket; | |
1765 | case TCP_TW_SUCCESS:; | |
1766 | } | |
1767 | goto discard_it; | |
1768 | } | |
1769 | ||
1da177e4 LT |
1770 | static int tcp_v6_remember_stamp(struct sock *sk) |
1771 | { | |
1772 | /* Alas, not yet... */ | |
1773 | return 0; | |
1774 | } | |
1775 | ||
8292a17a | 1776 | static struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1777 | .queue_xmit = inet6_csk_xmit, |
1778 | .send_check = tcp_v6_send_check, | |
1779 | .rebuild_header = inet6_sk_rebuild_header, | |
1780 | .conn_request = tcp_v6_conn_request, | |
1781 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1782 | .remember_stamp = tcp_v6_remember_stamp, | |
1783 | .net_header_len = sizeof(struct ipv6hdr), | |
1784 | .setsockopt = ipv6_setsockopt, | |
1785 | .getsockopt = ipv6_getsockopt, | |
1786 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1787 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1788 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1789 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1790 | .compat_setsockopt = compat_ipv6_setsockopt, |
1791 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1792 | #endif |
1da177e4 LT |
1793 | }; |
1794 | ||
cfb6eeb4 | 1795 | #ifdef CONFIG_TCP_MD5SIG |
a928630a | 1796 | static struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 YH |
1797 | .md5_lookup = tcp_v6_md5_lookup, |
1798 | .calc_md5_hash = tcp_v6_calc_md5_hash, | |
1799 | .md5_add = tcp_v6_md5_add_func, | |
1800 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1801 | }; |
a928630a | 1802 | #endif |
cfb6eeb4 | 1803 | |
1da177e4 LT |
1804 | /* |
1805 | * TCP over IPv4 via INET6 API | |
1806 | */ | |
1807 | ||
8292a17a | 1808 | static struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1809 | .queue_xmit = ip_queue_xmit, |
1810 | .send_check = tcp_v4_send_check, | |
1811 | .rebuild_header = inet_sk_rebuild_header, | |
1812 | .conn_request = tcp_v6_conn_request, | |
1813 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1814 | .remember_stamp = tcp_v4_remember_stamp, | |
1815 | .net_header_len = sizeof(struct iphdr), | |
1816 | .setsockopt = ipv6_setsockopt, | |
1817 | .getsockopt = ipv6_getsockopt, | |
1818 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1819 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1820 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1821 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1822 | .compat_setsockopt = compat_ipv6_setsockopt, |
1823 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1824 | #endif |
1da177e4 LT |
1825 | }; |
1826 | ||
cfb6eeb4 | 1827 | #ifdef CONFIG_TCP_MD5SIG |
a928630a | 1828 | static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 YH |
1829 | .md5_lookup = tcp_v4_md5_lookup, |
1830 | .calc_md5_hash = tcp_v4_calc_md5_hash, | |
1831 | .md5_add = tcp_v6_md5_add_func, | |
1832 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1833 | }; |
a928630a | 1834 | #endif |
cfb6eeb4 | 1835 | |
1da177e4 LT |
1836 | /* NOTE: A lot of things set to zero explicitly by call to |
1837 | * sk_alloc() so need not be done here. | |
1838 | */ | |
1839 | static int tcp_v6_init_sock(struct sock *sk) | |
1840 | { | |
6687e988 | 1841 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1842 | struct tcp_sock *tp = tcp_sk(sk); |
1843 | ||
1844 | skb_queue_head_init(&tp->out_of_order_queue); | |
1845 | tcp_init_xmit_timers(sk); | |
1846 | tcp_prequeue_init(tp); | |
1847 | ||
6687e988 | 1848 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1849 | tp->mdev = TCP_TIMEOUT_INIT; |
1850 | ||
1851 | /* So many TCP implementations out there (incorrectly) count the | |
1852 | * initial SYN frame in their delayed-ACK and congestion control | |
1853 | * algorithms that we must have the following bandaid to talk | |
1854 | * efficiently to them. -DaveM | |
1855 | */ | |
1856 | tp->snd_cwnd = 2; | |
1857 | ||
1858 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1859 | * initialization of these values. | |
1860 | */ | |
1861 | tp->snd_ssthresh = 0x7fffffff; | |
1862 | tp->snd_cwnd_clamp = ~0; | |
c1b4a7e6 | 1863 | tp->mss_cache = 536; |
1da177e4 LT |
1864 | |
1865 | tp->reordering = sysctl_tcp_reordering; | |
1866 | ||
1867 | sk->sk_state = TCP_CLOSE; | |
1868 | ||
8292a17a | 1869 | icsk->icsk_af_ops = &ipv6_specific; |
6687e988 | 1870 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
d83d8461 | 1871 | icsk->icsk_sync_mss = tcp_sync_mss; |
1da177e4 LT |
1872 | sk->sk_write_space = sk_stream_write_space; |
1873 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1874 | ||
cfb6eeb4 YH |
1875 | #ifdef CONFIG_TCP_MD5SIG |
1876 | tp->af_specific = &tcp_sock_ipv6_specific; | |
1877 | #endif | |
1878 | ||
1da177e4 LT |
1879 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
1880 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1881 | ||
1882 | atomic_inc(&tcp_sockets_allocated); | |
1883 | ||
1884 | return 0; | |
1885 | } | |
1886 | ||
1887 | static int tcp_v6_destroy_sock(struct sock *sk) | |
1888 | { | |
cfb6eeb4 YH |
1889 | #ifdef CONFIG_TCP_MD5SIG |
1890 | /* Clean up the MD5 key list */ | |
1891 | if (tcp_sk(sk)->md5sig_info) | |
1892 | tcp_v6_clear_md5_list(sk); | |
1893 | #endif | |
1da177e4 LT |
1894 | tcp_v4_destroy_sock(sk); |
1895 | return inet6_destroy_sock(sk); | |
1896 | } | |
1897 | ||
952a10be | 1898 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1899 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1900 | static void get_openreq6(struct seq_file *seq, |
60236fdd | 1901 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 1902 | { |
1da177e4 | 1903 | int ttd = req->expires - jiffies; |
ca304b61 ACM |
1904 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1905 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1906 | |
1907 | if (ttd < 0) | |
1908 | ttd = 0; | |
1909 | ||
1da177e4 LT |
1910 | seq_printf(seq, |
1911 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1912 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1913 | i, | |
1914 | src->s6_addr32[0], src->s6_addr32[1], | |
1915 | src->s6_addr32[2], src->s6_addr32[3], | |
1916 | ntohs(inet_sk(sk)->sport), | |
1917 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1918 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1919 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1920 | TCP_SYN_RECV, |
1921 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
1922 | 1, /* timers active (only the expire timer) */ |
1923 | jiffies_to_clock_t(ttd), | |
1da177e4 LT |
1924 | req->retrans, |
1925 | uid, | |
1ab1457c | 1926 | 0, /* non standard timer */ |
1da177e4 LT |
1927 | 0, /* open_requests have no inode */ |
1928 | 0, req); | |
1929 | } | |
1930 | ||
1931 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1932 | { | |
1933 | struct in6_addr *dest, *src; | |
1934 | __u16 destp, srcp; | |
1935 | int timer_active; | |
1936 | unsigned long timer_expires; | |
1937 | struct inet_sock *inet = inet_sk(sp); | |
1938 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1939 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
1940 | struct ipv6_pinfo *np = inet6_sk(sp); |
1941 | ||
1942 | dest = &np->daddr; | |
1943 | src = &np->rcv_saddr; | |
1944 | destp = ntohs(inet->dport); | |
1945 | srcp = ntohs(inet->sport); | |
463c84b9 ACM |
1946 | |
1947 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1948 | timer_active = 1; |
463c84b9 ACM |
1949 | timer_expires = icsk->icsk_timeout; |
1950 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1951 | timer_active = 4; |
463c84b9 | 1952 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1953 | } else if (timer_pending(&sp->sk_timer)) { |
1954 | timer_active = 2; | |
1955 | timer_expires = sp->sk_timer.expires; | |
1956 | } else { | |
1957 | timer_active = 0; | |
1958 | timer_expires = jiffies; | |
1959 | } | |
1960 | ||
1961 | seq_printf(seq, | |
1962 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1963 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n", | |
1964 | i, | |
1965 | src->s6_addr32[0], src->s6_addr32[1], | |
1966 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1967 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1968 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1969 | sp->sk_state, |
47da8ee6 SS |
1970 | tp->write_seq-tp->snd_una, |
1971 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 LT |
1972 | timer_active, |
1973 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 1974 | icsk->icsk_retransmits, |
1da177e4 | 1975 | sock_i_uid(sp), |
6687e988 | 1976 | icsk->icsk_probes_out, |
1da177e4 LT |
1977 | sock_i_ino(sp), |
1978 | atomic_read(&sp->sk_refcnt), sp, | |
463c84b9 ACM |
1979 | icsk->icsk_rto, |
1980 | icsk->icsk_ack.ato, | |
1981 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, | |
1da177e4 LT |
1982 | tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh |
1983 | ); | |
1984 | } | |
1985 | ||
1ab1457c | 1986 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1987 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
1988 | { |
1989 | struct in6_addr *dest, *src; | |
1990 | __u16 destp, srcp; | |
0fa1a53e | 1991 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
1992 | int ttd = tw->tw_ttd - jiffies; |
1993 | ||
1994 | if (ttd < 0) | |
1995 | ttd = 0; | |
1996 | ||
0fa1a53e ACM |
1997 | dest = &tw6->tw_v6_daddr; |
1998 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
1999 | destp = ntohs(tw->tw_dport); |
2000 | srcp = ntohs(tw->tw_sport); | |
2001 | ||
2002 | seq_printf(seq, | |
2003 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2004 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
2005 | i, | |
2006 | src->s6_addr32[0], src->s6_addr32[1], | |
2007 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2008 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2009 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2010 | tw->tw_substate, 0, 0, | |
2011 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2012 | atomic_read(&tw->tw_refcnt), tw); | |
2013 | } | |
2014 | ||
1da177e4 LT |
2015 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
2016 | { | |
2017 | struct tcp_iter_state *st; | |
2018 | ||
2019 | if (v == SEQ_START_TOKEN) { | |
2020 | seq_puts(seq, | |
2021 | " sl " | |
2022 | "local_address " | |
2023 | "remote_address " | |
2024 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2025 | " uid timeout inode\n"); | |
2026 | goto out; | |
2027 | } | |
2028 | st = seq->private; | |
2029 | ||
2030 | switch (st->state) { | |
2031 | case TCP_SEQ_STATE_LISTENING: | |
2032 | case TCP_SEQ_STATE_ESTABLISHED: | |
2033 | get_tcp6_sock(seq, v, st->num); | |
2034 | break; | |
2035 | case TCP_SEQ_STATE_OPENREQ: | |
2036 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
2037 | break; | |
2038 | case TCP_SEQ_STATE_TIME_WAIT: | |
2039 | get_timewait6_sock(seq, v, st->num); | |
2040 | break; | |
2041 | } | |
2042 | out: | |
2043 | return 0; | |
2044 | } | |
2045 | ||
1da177e4 | 2046 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
2047 | .name = "tcp6", |
2048 | .family = AF_INET6, | |
5f4472c5 DL |
2049 | .seq_fops = { |
2050 | .owner = THIS_MODULE, | |
2051 | }, | |
9427c4b3 DL |
2052 | .seq_ops = { |
2053 | .show = tcp6_seq_show, | |
2054 | }, | |
1da177e4 LT |
2055 | }; |
2056 | ||
6f8b13bc | 2057 | int tcp6_proc_init(struct net *net) |
1da177e4 | 2058 | { |
6f8b13bc | 2059 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2060 | } |
2061 | ||
6f8b13bc | 2062 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2063 | { |
6f8b13bc | 2064 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2065 | } |
2066 | #endif | |
2067 | ||
2068 | struct proto tcpv6_prot = { | |
2069 | .name = "TCPv6", | |
2070 | .owner = THIS_MODULE, | |
2071 | .close = tcp_close, | |
2072 | .connect = tcp_v6_connect, | |
2073 | .disconnect = tcp_disconnect, | |
463c84b9 | 2074 | .accept = inet_csk_accept, |
1da177e4 LT |
2075 | .ioctl = tcp_ioctl, |
2076 | .init = tcp_v6_init_sock, | |
2077 | .destroy = tcp_v6_destroy_sock, | |
2078 | .shutdown = tcp_shutdown, | |
2079 | .setsockopt = tcp_setsockopt, | |
2080 | .getsockopt = tcp_getsockopt, | |
1da177e4 LT |
2081 | .recvmsg = tcp_recvmsg, |
2082 | .backlog_rcv = tcp_v6_do_rcv, | |
2083 | .hash = tcp_v6_hash, | |
ab1e0a13 ACM |
2084 | .unhash = inet_unhash, |
2085 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2086 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2087 | .sockets_allocated = &tcp_sockets_allocated, | |
2088 | .memory_allocated = &tcp_memory_allocated, | |
2089 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2090 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2091 | .sysctl_mem = sysctl_tcp_mem, |
2092 | .sysctl_wmem = sysctl_tcp_wmem, | |
2093 | .sysctl_rmem = sysctl_tcp_rmem, | |
2094 | .max_header = MAX_TCP_HEADER, | |
2095 | .obj_size = sizeof(struct tcp6_sock), | |
6d6ee43e | 2096 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2097 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2098 | .h.hashinfo = &tcp_hashinfo, |
543d9cfe ACM |
2099 | #ifdef CONFIG_COMPAT |
2100 | .compat_setsockopt = compat_tcp_setsockopt, | |
2101 | .compat_getsockopt = compat_tcp_getsockopt, | |
2102 | #endif | |
1da177e4 LT |
2103 | }; |
2104 | ||
2105 | static struct inet6_protocol tcpv6_protocol = { | |
2106 | .handler = tcp_v6_rcv, | |
2107 | .err_handler = tcp_v6_err, | |
a430a43d | 2108 | .gso_send_check = tcp_v6_gso_send_check, |
adcfc7d0 | 2109 | .gso_segment = tcp_tso_segment, |
1da177e4 LT |
2110 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
2111 | }; | |
2112 | ||
1da177e4 LT |
2113 | static struct inet_protosw tcpv6_protosw = { |
2114 | .type = SOCK_STREAM, | |
2115 | .protocol = IPPROTO_TCP, | |
2116 | .prot = &tcpv6_prot, | |
2117 | .ops = &inet6_stream_ops, | |
2118 | .capability = -1, | |
2119 | .no_check = 0, | |
d83d8461 ACM |
2120 | .flags = INET_PROTOSW_PERMANENT | |
2121 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2122 | }; |
2123 | ||
93ec926b DL |
2124 | static int tcpv6_net_init(struct net *net) |
2125 | { | |
5677242f DL |
2126 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2127 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2128 | } |
2129 | ||
2130 | static void tcpv6_net_exit(struct net *net) | |
2131 | { | |
5677242f | 2132 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
93ec926b DL |
2133 | } |
2134 | ||
2135 | static struct pernet_operations tcpv6_net_ops = { | |
2136 | .init = tcpv6_net_init, | |
2137 | .exit = tcpv6_net_exit, | |
2138 | }; | |
2139 | ||
7f4e4868 | 2140 | int __init tcpv6_init(void) |
1da177e4 | 2141 | { |
7f4e4868 DL |
2142 | int ret; |
2143 | ||
2144 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2145 | if (ret) | |
2146 | goto out; | |
2147 | ||
1da177e4 | 2148 | /* register inet6 protocol */ |
7f4e4868 DL |
2149 | ret = inet6_register_protosw(&tcpv6_protosw); |
2150 | if (ret) | |
2151 | goto out_tcpv6_protocol; | |
2152 | ||
93ec926b | 2153 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2154 | if (ret) |
2155 | goto out_tcpv6_protosw; | |
2156 | out: | |
2157 | return ret; | |
ae0f7d5f | 2158 | |
7f4e4868 DL |
2159 | out_tcpv6_protocol: |
2160 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2161 | out_tcpv6_protosw: | |
2162 | inet6_unregister_protosw(&tcpv6_protosw); | |
2163 | goto out; | |
2164 | } | |
2165 | ||
09f7709f | 2166 | void tcpv6_exit(void) |
7f4e4868 | 2167 | { |
93ec926b | 2168 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2169 | inet6_unregister_protosw(&tcpv6_protosw); |
2170 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2171 | } |