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> |
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); |
60236fdd | 73 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req); |
1ab1457c | 74 | static void tcp_v6_send_check(struct sock *sk, int len, |
1da177e4 LT |
75 | struct sk_buff *skb); |
76 | ||
77 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 78 | |
8292a17a ACM |
79 | static struct inet_connection_sock_af_ops ipv6_mapped; |
80 | static struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 81 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
82 | static struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
83 | static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
a928630a | 84 | #endif |
1da177e4 | 85 | |
1da177e4 LT |
86 | static void tcp_v6_hash(struct sock *sk) |
87 | { | |
88 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 89 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
90 | tcp_prot.hash(sk); |
91 | return; | |
92 | } | |
93 | local_bh_disable(); | |
ab1e0a13 | 94 | __inet6_hash(sk); |
1da177e4 LT |
95 | local_bh_enable(); |
96 | } | |
97 | } | |
98 | ||
868c86bc | 99 | static __inline__ __sum16 tcp_v6_check(struct tcphdr *th, int len, |
1ab1457c YH |
100 | struct in6_addr *saddr, |
101 | struct in6_addr *daddr, | |
868c86bc | 102 | __wsum base) |
1da177e4 LT |
103 | { |
104 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
105 | } | |
106 | ||
a94f723d | 107 | static __u32 tcp_v6_init_sequence(struct sk_buff *skb) |
1da177e4 | 108 | { |
0660e03f ACM |
109 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
110 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
111 | tcp_hdr(skb)->dest, |
112 | tcp_hdr(skb)->source); | |
1da177e4 LT |
113 | } |
114 | ||
1ab1457c | 115 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
116 | int addr_len) |
117 | { | |
118 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 119 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 120 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
121 | struct ipv6_pinfo *np = inet6_sk(sk); |
122 | struct tcp_sock *tp = tcp_sk(sk); | |
123 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
124 | struct flowi fl; | |
125 | struct dst_entry *dst; | |
126 | int addr_type; | |
127 | int err; | |
128 | ||
1ab1457c | 129 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
130 | return -EINVAL; |
131 | ||
1ab1457c | 132 | if (usin->sin6_family != AF_INET6) |
1da177e4 LT |
133 | return(-EAFNOSUPPORT); |
134 | ||
135 | memset(&fl, 0, sizeof(fl)); | |
136 | ||
137 | if (np->sndflow) { | |
138 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
139 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
140 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
141 | struct ip6_flowlabel *flowlabel; | |
142 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
143 | if (flowlabel == NULL) | |
144 | return -EINVAL; | |
145 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
146 | fl6_sock_release(flowlabel); | |
147 | } | |
148 | } | |
149 | ||
150 | /* | |
1ab1457c YH |
151 | * connect() to INADDR_ANY means loopback (BSD'ism). |
152 | */ | |
153 | ||
154 | if(ipv6_addr_any(&usin->sin6_addr)) | |
155 | usin->sin6_addr.s6_addr[15] = 0x1; | |
1da177e4 LT |
156 | |
157 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
158 | ||
159 | if(addr_type & IPV6_ADDR_MULTICAST) | |
160 | return -ENETUNREACH; | |
161 | ||
162 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
163 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
164 | usin->sin6_scope_id) { | |
165 | /* If interface is set while binding, indices | |
166 | * must coincide. | |
167 | */ | |
168 | if (sk->sk_bound_dev_if && | |
169 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
170 | return -EINVAL; | |
171 | ||
172 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
173 | } | |
174 | ||
175 | /* Connect to link-local address requires an interface */ | |
176 | if (!sk->sk_bound_dev_if) | |
177 | return -EINVAL; | |
178 | } | |
179 | ||
180 | if (tp->rx_opt.ts_recent_stamp && | |
181 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
182 | tp->rx_opt.ts_recent = 0; | |
183 | tp->rx_opt.ts_recent_stamp = 0; | |
184 | tp->write_seq = 0; | |
185 | } | |
186 | ||
187 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
188 | np->flow_label = fl.fl6_flowlabel; | |
189 | ||
190 | /* | |
191 | * TCP over IPv4 | |
192 | */ | |
193 | ||
194 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 195 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
196 | struct sockaddr_in sin; |
197 | ||
198 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
199 | ||
200 | if (__ipv6_only_sock(sk)) | |
201 | return -ENETUNREACH; | |
202 | ||
203 | sin.sin_family = AF_INET; | |
204 | sin.sin_port = usin->sin6_port; | |
205 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
206 | ||
d83d8461 | 207 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 208 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
209 | #ifdef CONFIG_TCP_MD5SIG |
210 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
211 | #endif | |
1da177e4 LT |
212 | |
213 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
214 | ||
215 | if (err) { | |
d83d8461 ACM |
216 | icsk->icsk_ext_hdr_len = exthdrlen; |
217 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 218 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
219 | #ifdef CONFIG_TCP_MD5SIG |
220 | tp->af_specific = &tcp_sock_ipv6_specific; | |
221 | #endif | |
1da177e4 LT |
222 | goto failure; |
223 | } else { | |
224 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
225 | inet->saddr); | |
226 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
227 | inet->rcv_saddr); | |
228 | } | |
229 | ||
230 | return err; | |
231 | } | |
232 | ||
233 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
234 | saddr = &np->rcv_saddr; | |
235 | ||
236 | fl.proto = IPPROTO_TCP; | |
237 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
238 | ipv6_addr_copy(&fl.fl6_src, | |
239 | (saddr ? saddr : &np->saddr)); | |
240 | fl.oif = sk->sk_bound_dev_if; | |
241 | fl.fl_ip_dport = usin->sin6_port; | |
242 | fl.fl_ip_sport = inet->sport; | |
243 | ||
244 | if (np->opt && np->opt->srcrt) { | |
245 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
246 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
247 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
248 | final_p = &final; | |
249 | } | |
250 | ||
beb8d13b VY |
251 | security_sk_classify_flow(sk, &fl); |
252 | ||
1da177e4 LT |
253 | err = ip6_dst_lookup(sk, &dst, &fl); |
254 | if (err) | |
255 | goto failure; | |
256 | if (final_p) | |
257 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
258 | ||
bb72845e | 259 | if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) { |
14e50e57 DM |
260 | if (err == -EREMOTE) |
261 | err = ip6_dst_blackhole(sk, &dst, &fl); | |
262 | if (err < 0) | |
263 | goto failure; | |
264 | } | |
1da177e4 LT |
265 | |
266 | if (saddr == NULL) { | |
267 | saddr = &fl.fl6_src; | |
268 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
269 | } | |
270 | ||
271 | /* set the source address */ | |
272 | ipv6_addr_copy(&np->saddr, saddr); | |
273 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
274 | ||
f83ef8c0 | 275 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 276 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 277 | |
d83d8461 | 278 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 279 | if (np->opt) |
d83d8461 ACM |
280 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
281 | np->opt->opt_nflen); | |
1da177e4 LT |
282 | |
283 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
284 | ||
285 | inet->dport = usin->sin6_port; | |
286 | ||
287 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 288 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
289 | if (err) |
290 | goto late_failure; | |
291 | ||
292 | if (!tp->write_seq) | |
293 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
294 | np->daddr.s6_addr32, | |
295 | inet->sport, | |
296 | inet->dport); | |
297 | ||
298 | err = tcp_connect(sk); | |
299 | if (err) | |
300 | goto late_failure; | |
301 | ||
302 | return 0; | |
303 | ||
304 | late_failure: | |
305 | tcp_set_state(sk, TCP_CLOSE); | |
306 | __sk_dst_reset(sk); | |
307 | failure: | |
308 | inet->dport = 0; | |
309 | sk->sk_route_caps = 0; | |
310 | return err; | |
311 | } | |
312 | ||
313 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
04ce6909 | 314 | int type, int code, int offset, __be32 info) |
1da177e4 LT |
315 | { |
316 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
505cbfc5 | 317 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
318 | struct ipv6_pinfo *np; |
319 | struct sock *sk; | |
320 | int err; | |
1ab1457c | 321 | struct tcp_sock *tp; |
1da177e4 LT |
322 | __u32 seq; |
323 | ||
c346dca1 | 324 | sk = inet6_lookup(dev_net(skb->dev), &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 325 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
326 | |
327 | if (sk == NULL) { | |
328 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
329 | return; | |
330 | } | |
331 | ||
332 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 333 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
334 | return; |
335 | } | |
336 | ||
337 | bh_lock_sock(sk); | |
338 | if (sock_owned_by_user(sk)) | |
339 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
340 | ||
341 | if (sk->sk_state == TCP_CLOSE) | |
342 | goto out; | |
343 | ||
344 | tp = tcp_sk(sk); | |
1ab1457c | 345 | seq = ntohl(th->seq); |
1da177e4 LT |
346 | if (sk->sk_state != TCP_LISTEN && |
347 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
348 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
349 | goto out; | |
350 | } | |
351 | ||
352 | np = inet6_sk(sk); | |
353 | ||
354 | if (type == ICMPV6_PKT_TOOBIG) { | |
355 | struct dst_entry *dst = NULL; | |
356 | ||
357 | if (sock_owned_by_user(sk)) | |
358 | goto out; | |
359 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
360 | goto out; | |
361 | ||
362 | /* icmp should have updated the destination cache entry */ | |
363 | dst = __sk_dst_check(sk, np->dst_cookie); | |
364 | ||
365 | if (dst == NULL) { | |
366 | struct inet_sock *inet = inet_sk(sk); | |
367 | struct flowi fl; | |
368 | ||
369 | /* BUGGG_FUTURE: Again, it is not clear how | |
370 | to handle rthdr case. Ignore this complexity | |
371 | for now. | |
372 | */ | |
373 | memset(&fl, 0, sizeof(fl)); | |
374 | fl.proto = IPPROTO_TCP; | |
375 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
376 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
377 | fl.oif = sk->sk_bound_dev_if; | |
378 | fl.fl_ip_dport = inet->dport; | |
379 | fl.fl_ip_sport = inet->sport; | |
beb8d13b | 380 | security_skb_classify_flow(skb, &fl); |
1da177e4 LT |
381 | |
382 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
383 | sk->sk_err_soft = -err; | |
384 | goto out; | |
385 | } | |
386 | ||
387 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
388 | sk->sk_err_soft = -err; | |
389 | goto out; | |
390 | } | |
391 | ||
392 | } else | |
393 | dst_hold(dst); | |
394 | ||
d83d8461 | 395 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
1da177e4 LT |
396 | tcp_sync_mss(sk, dst_mtu(dst)); |
397 | tcp_simple_retransmit(sk); | |
398 | } /* else let the usual retransmit timer handle it */ | |
399 | dst_release(dst); | |
400 | goto out; | |
401 | } | |
402 | ||
403 | icmpv6_err_convert(type, code, &err); | |
404 | ||
60236fdd | 405 | /* Might be for an request_sock */ |
1da177e4 | 406 | switch (sk->sk_state) { |
60236fdd | 407 | struct request_sock *req, **prev; |
1da177e4 LT |
408 | case TCP_LISTEN: |
409 | if (sock_owned_by_user(sk)) | |
410 | goto out; | |
411 | ||
8129765a ACM |
412 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
413 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
414 | if (!req) |
415 | goto out; | |
416 | ||
417 | /* ICMPs are not backlogged, hence we cannot get | |
418 | * an established socket here. | |
419 | */ | |
420 | BUG_TRAP(req->sk == NULL); | |
421 | ||
2e6599cb | 422 | if (seq != tcp_rsk(req)->snt_isn) { |
1da177e4 LT |
423 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
424 | goto out; | |
425 | } | |
426 | ||
463c84b9 | 427 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
428 | goto out; |
429 | ||
430 | case TCP_SYN_SENT: | |
431 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 432 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 433 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
434 | sk->sk_err = err; |
435 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
436 | ||
437 | tcp_done(sk); | |
438 | } else | |
439 | sk->sk_err_soft = err; | |
440 | goto out; | |
441 | } | |
442 | ||
443 | if (!sock_owned_by_user(sk) && np->recverr) { | |
444 | sk->sk_err = err; | |
445 | sk->sk_error_report(sk); | |
446 | } else | |
447 | sk->sk_err_soft = err; | |
448 | ||
449 | out: | |
450 | bh_unlock_sock(sk); | |
451 | sock_put(sk); | |
452 | } | |
453 | ||
454 | ||
fd80eb94 | 455 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req) |
1da177e4 | 456 | { |
ca304b61 | 457 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
458 | struct ipv6_pinfo *np = inet6_sk(sk); |
459 | struct sk_buff * skb; | |
460 | struct ipv6_txoptions *opt = NULL; | |
461 | struct in6_addr * final_p = NULL, final; | |
462 | struct flowi fl; | |
fd80eb94 | 463 | struct dst_entry *dst; |
1da177e4 LT |
464 | int err = -1; |
465 | ||
466 | memset(&fl, 0, sizeof(fl)); | |
467 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
468 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
469 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 470 | fl.fl6_flowlabel = 0; |
2e6599cb ACM |
471 | fl.oif = treq->iif; |
472 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
1da177e4 | 473 | fl.fl_ip_sport = inet_sk(sk)->sport; |
4237c75c | 474 | security_req_classify_flow(req, &fl); |
1da177e4 | 475 | |
fd80eb94 DL |
476 | opt = np->opt; |
477 | if (opt && opt->srcrt) { | |
478 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
479 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
480 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
481 | final_p = &final; | |
1da177e4 LT |
482 | } |
483 | ||
fd80eb94 DL |
484 | err = ip6_dst_lookup(sk, &dst, &fl); |
485 | if (err) | |
486 | goto done; | |
487 | if (final_p) | |
488 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
489 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
490 | goto done; | |
491 | ||
1da177e4 LT |
492 | skb = tcp_make_synack(sk, dst, req); |
493 | if (skb) { | |
aa8223c7 | 494 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
495 | |
496 | th->check = tcp_v6_check(th, skb->len, | |
2e6599cb | 497 | &treq->loc_addr, &treq->rmt_addr, |
1da177e4 LT |
498 | csum_partial((char *)th, skb->len, skb->csum)); |
499 | ||
2e6599cb | 500 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 | 501 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
b9df3cb8 | 502 | err = net_xmit_eval(err); |
1da177e4 LT |
503 | } |
504 | ||
505 | done: | |
1ab1457c | 506 | if (opt && opt != np->opt) |
1da177e4 | 507 | sock_kfree_s(sk, opt, opt->tot_len); |
78b91042 | 508 | dst_release(dst); |
1da177e4 LT |
509 | return err; |
510 | } | |
511 | ||
c6aefafb GG |
512 | static inline void syn_flood_warning(struct sk_buff *skb) |
513 | { | |
514 | #ifdef CONFIG_SYN_COOKIES | |
515 | if (sysctl_tcp_syncookies) | |
516 | printk(KERN_INFO | |
517 | "TCPv6: Possible SYN flooding on port %d. " | |
518 | "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest)); | |
519 | else | |
520 | #endif | |
521 | printk(KERN_INFO | |
522 | "TCPv6: Possible SYN flooding on port %d. " | |
523 | "Dropping request.\n", ntohs(tcp_hdr(skb)->dest)); | |
524 | } | |
525 | ||
60236fdd | 526 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 527 | { |
ca304b61 ACM |
528 | if (inet6_rsk(req)->pktopts) |
529 | kfree_skb(inet6_rsk(req)->pktopts); | |
1da177e4 LT |
530 | } |
531 | ||
cfb6eeb4 YH |
532 | #ifdef CONFIG_TCP_MD5SIG |
533 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
534 | struct in6_addr *addr) | |
535 | { | |
536 | struct tcp_sock *tp = tcp_sk(sk); | |
537 | int i; | |
538 | ||
539 | BUG_ON(tp == NULL); | |
540 | ||
541 | if (!tp->md5sig_info || !tp->md5sig_info->entries6) | |
542 | return NULL; | |
543 | ||
544 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
545 | if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, addr) == 0) | |
f8ab18d2 | 546 | return &tp->md5sig_info->keys6[i].base; |
cfb6eeb4 YH |
547 | } |
548 | return NULL; | |
549 | } | |
550 | ||
551 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
552 | struct sock *addr_sk) | |
553 | { | |
554 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); | |
555 | } | |
556 | ||
557 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
558 | struct request_sock *req) | |
559 | { | |
560 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
561 | } | |
562 | ||
563 | static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer, | |
564 | char *newkey, u8 newkeylen) | |
565 | { | |
566 | /* Add key to the list */ | |
b0a713e9 | 567 | struct tcp_md5sig_key *key; |
cfb6eeb4 YH |
568 | struct tcp_sock *tp = tcp_sk(sk); |
569 | struct tcp6_md5sig_key *keys; | |
570 | ||
b0a713e9 | 571 | key = tcp_v6_md5_do_lookup(sk, peer); |
cfb6eeb4 YH |
572 | if (key) { |
573 | /* modify existing entry - just update that one */ | |
b0a713e9 MD |
574 | kfree(key->key); |
575 | key->key = newkey; | |
576 | key->keylen = newkeylen; | |
cfb6eeb4 YH |
577 | } else { |
578 | /* reallocate new list if current one is full. */ | |
579 | if (!tp->md5sig_info) { | |
580 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC); | |
581 | if (!tp->md5sig_info) { | |
582 | kfree(newkey); | |
583 | return -ENOMEM; | |
584 | } | |
3d7dbeac | 585 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 | 586 | } |
aacbe8c8 YH |
587 | if (tcp_alloc_md5sig_pool() == NULL) { |
588 | kfree(newkey); | |
589 | return -ENOMEM; | |
590 | } | |
cfb6eeb4 YH |
591 | if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) { |
592 | keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) * | |
593 | (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC); | |
594 | ||
595 | if (!keys) { | |
596 | tcp_free_md5sig_pool(); | |
597 | kfree(newkey); | |
598 | return -ENOMEM; | |
599 | } | |
600 | ||
601 | if (tp->md5sig_info->entries6) | |
602 | memmove(keys, tp->md5sig_info->keys6, | |
603 | (sizeof (tp->md5sig_info->keys6[0]) * | |
604 | tp->md5sig_info->entries6)); | |
605 | ||
606 | kfree(tp->md5sig_info->keys6); | |
607 | tp->md5sig_info->keys6 = keys; | |
608 | tp->md5sig_info->alloced6++; | |
609 | } | |
610 | ||
611 | ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr, | |
612 | peer); | |
f8ab18d2 DM |
613 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey; |
614 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen; | |
cfb6eeb4 YH |
615 | |
616 | tp->md5sig_info->entries6++; | |
617 | } | |
618 | return 0; | |
619 | } | |
620 | ||
621 | static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk, | |
622 | u8 *newkey, __u8 newkeylen) | |
623 | { | |
624 | return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr, | |
625 | newkey, newkeylen); | |
626 | } | |
627 | ||
628 | static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer) | |
629 | { | |
630 | struct tcp_sock *tp = tcp_sk(sk); | |
631 | int i; | |
632 | ||
633 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
634 | if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, peer) == 0) { | |
635 | /* Free the key */ | |
f8ab18d2 | 636 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
637 | tp->md5sig_info->entries6--; |
638 | ||
639 | if (tp->md5sig_info->entries6 == 0) { | |
640 | kfree(tp->md5sig_info->keys6); | |
641 | tp->md5sig_info->keys6 = NULL; | |
ca983cef | 642 | tp->md5sig_info->alloced6 = 0; |
cfb6eeb4 YH |
643 | } else { |
644 | /* shrink the database */ | |
645 | if (tp->md5sig_info->entries6 != i) | |
646 | memmove(&tp->md5sig_info->keys6[i], | |
647 | &tp->md5sig_info->keys6[i+1], | |
648 | (tp->md5sig_info->entries6 - i) | |
649 | * sizeof (tp->md5sig_info->keys6[0])); | |
650 | } | |
77adefdc YH |
651 | tcp_free_md5sig_pool(); |
652 | return 0; | |
cfb6eeb4 YH |
653 | } |
654 | } | |
655 | return -ENOENT; | |
656 | } | |
657 | ||
658 | static void tcp_v6_clear_md5_list (struct sock *sk) | |
659 | { | |
660 | struct tcp_sock *tp = tcp_sk(sk); | |
661 | int i; | |
662 | ||
663 | if (tp->md5sig_info->entries6) { | |
664 | for (i = 0; i < tp->md5sig_info->entries6; i++) | |
f8ab18d2 | 665 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
666 | tp->md5sig_info->entries6 = 0; |
667 | tcp_free_md5sig_pool(); | |
668 | } | |
669 | ||
670 | kfree(tp->md5sig_info->keys6); | |
671 | tp->md5sig_info->keys6 = NULL; | |
672 | tp->md5sig_info->alloced6 = 0; | |
673 | ||
674 | if (tp->md5sig_info->entries4) { | |
675 | for (i = 0; i < tp->md5sig_info->entries4; i++) | |
f8ab18d2 | 676 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
677 | tp->md5sig_info->entries4 = 0; |
678 | tcp_free_md5sig_pool(); | |
679 | } | |
680 | ||
681 | kfree(tp->md5sig_info->keys4); | |
682 | tp->md5sig_info->keys4 = NULL; | |
683 | tp->md5sig_info->alloced4 = 0; | |
684 | } | |
685 | ||
686 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, | |
687 | int optlen) | |
688 | { | |
689 | struct tcp_md5sig cmd; | |
690 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
691 | u8 *newkey; | |
692 | ||
693 | if (optlen < sizeof(cmd)) | |
694 | return -EINVAL; | |
695 | ||
696 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
697 | return -EFAULT; | |
698 | ||
699 | if (sin6->sin6_family != AF_INET6) | |
700 | return -EINVAL; | |
701 | ||
702 | if (!cmd.tcpm_keylen) { | |
703 | if (!tcp_sk(sk)->md5sig_info) | |
704 | return -ENOENT; | |
e773e4fa | 705 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
cfb6eeb4 YH |
706 | return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]); |
707 | return tcp_v6_md5_do_del(sk, &sin6->sin6_addr); | |
708 | } | |
709 | ||
710 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
711 | return -EINVAL; | |
712 | ||
713 | if (!tcp_sk(sk)->md5sig_info) { | |
714 | struct tcp_sock *tp = tcp_sk(sk); | |
715 | struct tcp_md5sig_info *p; | |
716 | ||
717 | p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL); | |
718 | if (!p) | |
719 | return -ENOMEM; | |
720 | ||
721 | tp->md5sig_info = p; | |
3d7dbeac | 722 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
cfb6eeb4 YH |
723 | } |
724 | ||
af879cc7 | 725 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
726 | if (!newkey) |
727 | return -ENOMEM; | |
e773e4fa | 728 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { |
cfb6eeb4 YH |
729 | return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3], |
730 | newkey, cmd.tcpm_keylen); | |
731 | } | |
732 | return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen); | |
733 | } | |
734 | ||
735 | static int tcp_v6_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, | |
736 | struct in6_addr *saddr, | |
737 | struct in6_addr *daddr, | |
738 | struct tcphdr *th, int protocol, | |
9cb5734e | 739 | unsigned int tcplen) |
cfb6eeb4 YH |
740 | { |
741 | struct scatterlist sg[4]; | |
742 | __u16 data_len; | |
743 | int block = 0; | |
8e5200f5 | 744 | __sum16 cksum; |
cfb6eeb4 YH |
745 | struct tcp_md5sig_pool *hp; |
746 | struct tcp6_pseudohdr *bp; | |
747 | struct hash_desc *desc; | |
748 | int err; | |
749 | unsigned int nbytes = 0; | |
750 | ||
751 | hp = tcp_get_md5sig_pool(); | |
752 | if (!hp) { | |
0dc47877 | 753 | printk(KERN_WARNING "%s(): hash pool not found...\n", __func__); |
cfb6eeb4 YH |
754 | goto clear_hash_noput; |
755 | } | |
756 | bp = &hp->md5_blk.ip6; | |
757 | desc = &hp->md5_desc; | |
758 | ||
759 | /* 1. TCP pseudo-header (RFC2460) */ | |
760 | ipv6_addr_copy(&bp->saddr, saddr); | |
761 | ipv6_addr_copy(&bp->daddr, daddr); | |
762 | bp->len = htonl(tcplen); | |
763 | bp->protocol = htonl(protocol); | |
764 | ||
c7da57a1 DM |
765 | sg_init_table(sg, 4); |
766 | ||
cfb6eeb4 YH |
767 | sg_set_buf(&sg[block++], bp, sizeof(*bp)); |
768 | nbytes += sizeof(*bp); | |
769 | ||
770 | /* 2. TCP header, excluding options */ | |
771 | cksum = th->check; | |
772 | th->check = 0; | |
773 | sg_set_buf(&sg[block++], th, sizeof(*th)); | |
774 | nbytes += sizeof(*th); | |
775 | ||
776 | /* 3. TCP segment data (if any) */ | |
777 | data_len = tcplen - (th->doff << 2); | |
778 | if (data_len > 0) { | |
779 | u8 *data = (u8 *)th + (th->doff << 2); | |
780 | sg_set_buf(&sg[block++], data, data_len); | |
781 | nbytes += data_len; | |
782 | } | |
783 | ||
784 | /* 4. shared key */ | |
785 | sg_set_buf(&sg[block++], key->key, key->keylen); | |
786 | nbytes += key->keylen; | |
787 | ||
c46f2334 | 788 | sg_mark_end(&sg[block - 1]); |
c7da57a1 | 789 | |
cfb6eeb4 YH |
790 | /* Now store the hash into the packet */ |
791 | err = crypto_hash_init(desc); | |
792 | if (err) { | |
0dc47877 | 793 | printk(KERN_WARNING "%s(): hash_init failed\n", __func__); |
cfb6eeb4 YH |
794 | goto clear_hash; |
795 | } | |
796 | err = crypto_hash_update(desc, sg, nbytes); | |
797 | if (err) { | |
0dc47877 | 798 | printk(KERN_WARNING "%s(): hash_update failed\n", __func__); |
cfb6eeb4 YH |
799 | goto clear_hash; |
800 | } | |
801 | err = crypto_hash_final(desc, md5_hash); | |
802 | if (err) { | |
0dc47877 | 803 | printk(KERN_WARNING "%s(): hash_final failed\n", __func__); |
cfb6eeb4 YH |
804 | goto clear_hash; |
805 | } | |
806 | ||
807 | /* Reset header, and free up the crypto */ | |
808 | tcp_put_md5sig_pool(); | |
809 | th->check = cksum; | |
810 | out: | |
811 | return 0; | |
812 | clear_hash: | |
813 | tcp_put_md5sig_pool(); | |
814 | clear_hash_noput: | |
815 | memset(md5_hash, 0, 16); | |
816 | goto out; | |
817 | } | |
818 | ||
819 | static int tcp_v6_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, | |
820 | struct sock *sk, | |
821 | struct dst_entry *dst, | |
822 | struct request_sock *req, | |
823 | struct tcphdr *th, int protocol, | |
9cb5734e | 824 | unsigned int tcplen) |
cfb6eeb4 YH |
825 | { |
826 | struct in6_addr *saddr, *daddr; | |
827 | ||
828 | if (sk) { | |
829 | saddr = &inet6_sk(sk)->saddr; | |
830 | daddr = &inet6_sk(sk)->daddr; | |
831 | } else { | |
832 | saddr = &inet6_rsk(req)->loc_addr; | |
833 | daddr = &inet6_rsk(req)->rmt_addr; | |
834 | } | |
835 | return tcp_v6_do_calc_md5_hash(md5_hash, key, | |
836 | saddr, daddr, | |
837 | th, protocol, tcplen); | |
838 | } | |
839 | ||
840 | static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb) | |
841 | { | |
842 | __u8 *hash_location = NULL; | |
843 | struct tcp_md5sig_key *hash_expected; | |
0660e03f | 844 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
aa8223c7 | 845 | struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
846 | int length = (th->doff << 2) - sizeof (*th); |
847 | int genhash; | |
848 | u8 *ptr; | |
849 | u8 newhash[16]; | |
850 | ||
851 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
852 | ||
853 | /* If the TCP option is too short, we can short cut */ | |
854 | if (length < TCPOLEN_MD5SIG) | |
855 | return hash_expected ? 1 : 0; | |
856 | ||
857 | /* parse options */ | |
858 | ptr = (u8*)(th + 1); | |
859 | while (length > 0) { | |
860 | int opcode = *ptr++; | |
861 | int opsize; | |
862 | ||
863 | switch(opcode) { | |
864 | case TCPOPT_EOL: | |
865 | goto done_opts; | |
866 | case TCPOPT_NOP: | |
867 | length--; | |
868 | continue; | |
869 | default: | |
870 | opsize = *ptr++; | |
871 | if (opsize < 2 || opsize > length) | |
872 | goto done_opts; | |
873 | if (opcode == TCPOPT_MD5SIG) { | |
874 | hash_location = ptr; | |
875 | goto done_opts; | |
876 | } | |
877 | } | |
878 | ptr += opsize - 2; | |
879 | length -= opsize; | |
880 | } | |
881 | ||
882 | done_opts: | |
883 | /* do we have a hash as expected? */ | |
884 | if (!hash_expected) { | |
885 | if (!hash_location) | |
886 | return 0; | |
887 | if (net_ratelimit()) { | |
888 | printk(KERN_INFO "MD5 Hash NOT expected but found " | |
889 | "(" NIP6_FMT ", %u)->" | |
890 | "(" NIP6_FMT ", %u)\n", | |
891 | NIP6(ip6h->saddr), ntohs(th->source), | |
892 | NIP6(ip6h->daddr), ntohs(th->dest)); | |
893 | } | |
894 | return 1; | |
895 | } | |
896 | ||
897 | if (!hash_location) { | |
898 | if (net_ratelimit()) { | |
899 | printk(KERN_INFO "MD5 Hash expected but NOT found " | |
900 | "(" NIP6_FMT ", %u)->" | |
901 | "(" NIP6_FMT ", %u)\n", | |
902 | NIP6(ip6h->saddr), ntohs(th->source), | |
903 | NIP6(ip6h->daddr), ntohs(th->dest)); | |
904 | } | |
905 | return 1; | |
906 | } | |
907 | ||
908 | /* check the signature */ | |
909 | genhash = tcp_v6_do_calc_md5_hash(newhash, | |
910 | hash_expected, | |
911 | &ip6h->saddr, &ip6h->daddr, | |
912 | th, sk->sk_protocol, | |
913 | skb->len); | |
914 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { | |
915 | if (net_ratelimit()) { | |
916 | printk(KERN_INFO "MD5 Hash %s for " | |
917 | "(" NIP6_FMT ", %u)->" | |
918 | "(" NIP6_FMT ", %u)\n", | |
919 | genhash ? "failed" : "mismatch", | |
920 | NIP6(ip6h->saddr), ntohs(th->source), | |
921 | NIP6(ip6h->daddr), ntohs(th->dest)); | |
922 | } | |
923 | return 1; | |
924 | } | |
925 | return 0; | |
926 | } | |
927 | #endif | |
928 | ||
c6aefafb | 929 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 930 | .family = AF_INET6, |
2e6599cb | 931 | .obj_size = sizeof(struct tcp6_request_sock), |
1da177e4 | 932 | .rtx_syn_ack = tcp_v6_send_synack, |
60236fdd ACM |
933 | .send_ack = tcp_v6_reqsk_send_ack, |
934 | .destructor = tcp_v6_reqsk_destructor, | |
1da177e4 LT |
935 | .send_reset = tcp_v6_send_reset |
936 | }; | |
937 | ||
cfb6eeb4 | 938 | #ifdef CONFIG_TCP_MD5SIG |
b6332e6c | 939 | static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 940 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
cfb6eeb4 | 941 | }; |
b6332e6c | 942 | #endif |
cfb6eeb4 | 943 | |
6d6ee43e ACM |
944 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
945 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
946 | .twsk_unique = tcp_twsk_unique, | |
cfb6eeb4 | 947 | .twsk_destructor= tcp_twsk_destructor, |
6d6ee43e ACM |
948 | }; |
949 | ||
8292a17a | 950 | static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) |
1da177e4 LT |
951 | { |
952 | struct ipv6_pinfo *np = inet6_sk(sk); | |
aa8223c7 | 953 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 954 | |
84fa7933 | 955 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1da177e4 | 956 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); |
663ead3b | 957 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 958 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 959 | } else { |
1ab1457c YH |
960 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, |
961 | csum_partial((char *)th, th->doff<<2, | |
1da177e4 LT |
962 | skb->csum)); |
963 | } | |
964 | } | |
965 | ||
a430a43d HX |
966 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
967 | { | |
968 | struct ipv6hdr *ipv6h; | |
969 | struct tcphdr *th; | |
970 | ||
971 | if (!pskb_may_pull(skb, sizeof(*th))) | |
972 | return -EINVAL; | |
973 | ||
0660e03f | 974 | ipv6h = ipv6_hdr(skb); |
aa8223c7 | 975 | th = tcp_hdr(skb); |
a430a43d HX |
976 | |
977 | th->check = 0; | |
978 | th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, | |
979 | IPPROTO_TCP, 0); | |
663ead3b | 980 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 981 | skb->csum_offset = offsetof(struct tcphdr, check); |
84fa7933 | 982 | skb->ip_summed = CHECKSUM_PARTIAL; |
a430a43d HX |
983 | return 0; |
984 | } | |
1da177e4 | 985 | |
cfb6eeb4 | 986 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 987 | { |
aa8223c7 | 988 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
989 | struct sk_buff *buff; |
990 | struct flowi fl; | |
c346dca1 | 991 | struct net *net = dev_net(skb->dst->dev); |
e5047992 | 992 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
9cb5734e | 993 | unsigned int tot_len = sizeof(*th); |
cfb6eeb4 YH |
994 | #ifdef CONFIG_TCP_MD5SIG |
995 | struct tcp_md5sig_key *key; | |
996 | #endif | |
1da177e4 LT |
997 | |
998 | if (th->rst) | |
999 | return; | |
1000 | ||
1001 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1002 | return; |
1da177e4 | 1003 | |
cfb6eeb4 YH |
1004 | #ifdef CONFIG_TCP_MD5SIG |
1005 | if (sk) | |
0660e03f | 1006 | key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr); |
cfb6eeb4 YH |
1007 | else |
1008 | key = NULL; | |
1009 | ||
1010 | if (key) | |
1011 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
1012 | #endif | |
1013 | ||
1da177e4 LT |
1014 | /* |
1015 | * We need to grab some memory, and put together an RST, | |
1016 | * and then put it into the queue to be sent. | |
1017 | */ | |
1018 | ||
cfb6eeb4 | 1019 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 1020 | GFP_ATOMIC); |
1ab1457c YH |
1021 | if (buff == NULL) |
1022 | return; | |
1da177e4 | 1023 | |
cfb6eeb4 | 1024 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 1025 | |
cfb6eeb4 | 1026 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
1da177e4 LT |
1027 | |
1028 | /* Swap the send and the receive. */ | |
1029 | memset(t1, 0, sizeof(*t1)); | |
1030 | t1->dest = th->source; | |
1031 | t1->source = th->dest; | |
cfb6eeb4 | 1032 | t1->doff = tot_len / 4; |
1da177e4 | 1033 | t1->rst = 1; |
1ab1457c | 1034 | |
1da177e4 | 1035 | if(th->ack) { |
1ab1457c | 1036 | t1->seq = th->ack_seq; |
1da177e4 LT |
1037 | } else { |
1038 | t1->ack = 1; | |
1039 | t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin | |
1040 | + skb->len - (th->doff<<2)); | |
1041 | } | |
1042 | ||
cfb6eeb4 YH |
1043 | #ifdef CONFIG_TCP_MD5SIG |
1044 | if (key) { | |
8e5200f5 | 1045 | __be32 *opt = (__be32*)(t1 + 1); |
cfb6eeb4 YH |
1046 | opt[0] = htonl((TCPOPT_NOP << 24) | |
1047 | (TCPOPT_NOP << 16) | | |
1048 | (TCPOPT_MD5SIG << 8) | | |
1049 | TCPOLEN_MD5SIG); | |
0660e03f ACM |
1050 | tcp_v6_do_calc_md5_hash((__u8 *)&opt[1], key, |
1051 | &ipv6_hdr(skb)->daddr, | |
1052 | &ipv6_hdr(skb)->saddr, | |
1053 | t1, IPPROTO_TCP, tot_len); | |
cfb6eeb4 YH |
1054 | } |
1055 | #endif | |
1056 | ||
1da177e4 LT |
1057 | buff->csum = csum_partial((char *)t1, sizeof(*t1), 0); |
1058 | ||
1059 | memset(&fl, 0, sizeof(fl)); | |
0660e03f ACM |
1060 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
1061 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1062 | |
1063 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
1064 | sizeof(*t1), IPPROTO_TCP, | |
1065 | buff->csum); | |
1066 | ||
1067 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 1068 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
1069 | fl.fl_ip_dport = t1->dest; |
1070 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 1071 | security_skb_classify_flow(skb, &fl); |
1da177e4 | 1072 | |
c20121ae DL |
1073 | /* Pass a socket to ip6_dst_lookup either it is for RST |
1074 | * Underlying function will use this to retrieve the network | |
1075 | * namespace | |
1076 | */ | |
e5047992 | 1077 | if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) { |
1da177e4 | 1078 | |
ecc51b6d | 1079 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
e5047992 | 1080 | ip6_xmit(ctl_sk, buff, &fl, NULL, 0); |
ecc51b6d ACM |
1081 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); |
1082 | TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); | |
1da177e4 | 1083 | return; |
ecc51b6d | 1084 | } |
1da177e4 LT |
1085 | } |
1086 | ||
1087 | kfree_skb(buff); | |
1088 | } | |
1089 | ||
cfb6eeb4 YH |
1090 | static void tcp_v6_send_ack(struct tcp_timewait_sock *tw, |
1091 | struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts) | |
1da177e4 | 1092 | { |
aa8223c7 | 1093 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 LT |
1094 | struct sk_buff *buff; |
1095 | struct flowi fl; | |
c346dca1 | 1096 | struct net *net = dev_net(skb->dev); |
e5047992 | 1097 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
9cb5734e | 1098 | unsigned int tot_len = sizeof(struct tcphdr); |
e69a4adc | 1099 | __be32 *topt; |
cfb6eeb4 YH |
1100 | #ifdef CONFIG_TCP_MD5SIG |
1101 | struct tcp_md5sig_key *key; | |
1102 | struct tcp_md5sig_key tw_key; | |
1103 | #endif | |
1104 | ||
1105 | #ifdef CONFIG_TCP_MD5SIG | |
1106 | if (!tw && skb->sk) { | |
0660e03f | 1107 | key = tcp_v6_md5_do_lookup(skb->sk, &ipv6_hdr(skb)->daddr); |
cfb6eeb4 YH |
1108 | } else if (tw && tw->tw_md5_keylen) { |
1109 | tw_key.key = tw->tw_md5_key; | |
1110 | tw_key.keylen = tw->tw_md5_keylen; | |
1111 | key = &tw_key; | |
1112 | } else { | |
1113 | key = NULL; | |
1114 | } | |
1115 | #endif | |
1da177e4 LT |
1116 | |
1117 | if (ts) | |
4244f8a9 | 1118 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 YH |
1119 | #ifdef CONFIG_TCP_MD5SIG |
1120 | if (key) | |
1121 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
1122 | #endif | |
1da177e4 LT |
1123 | |
1124 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, | |
1125 | GFP_ATOMIC); | |
1126 | if (buff == NULL) | |
1127 | return; | |
1128 | ||
1129 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); | |
1130 | ||
1131 | t1 = (struct tcphdr *) skb_push(buff,tot_len); | |
1132 | ||
1133 | /* Swap the send and the receive. */ | |
1134 | memset(t1, 0, sizeof(*t1)); | |
1135 | t1->dest = th->source; | |
1136 | t1->source = th->dest; | |
1137 | t1->doff = tot_len/4; | |
1138 | t1->seq = htonl(seq); | |
1139 | t1->ack_seq = htonl(ack); | |
1140 | t1->ack = 1; | |
1141 | t1->window = htons(win); | |
cfb6eeb4 | 1142 | |
e69a4adc | 1143 | topt = (__be32 *)(t1 + 1); |
1ab1457c | 1144 | |
1da177e4 | 1145 | if (ts) { |
cfb6eeb4 YH |
1146 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
1147 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
1148 | *topt++ = htonl(tcp_time_stamp); | |
1149 | *topt = htonl(ts); | |
1da177e4 LT |
1150 | } |
1151 | ||
cfb6eeb4 YH |
1152 | #ifdef CONFIG_TCP_MD5SIG |
1153 | if (key) { | |
1154 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
1155 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
0660e03f ACM |
1156 | tcp_v6_do_calc_md5_hash((__u8 *)topt, key, |
1157 | &ipv6_hdr(skb)->daddr, | |
1158 | &ipv6_hdr(skb)->saddr, | |
1159 | t1, IPPROTO_TCP, tot_len); | |
cfb6eeb4 YH |
1160 | } |
1161 | #endif | |
1162 | ||
1da177e4 LT |
1163 | buff->csum = csum_partial((char *)t1, tot_len, 0); |
1164 | ||
1165 | memset(&fl, 0, sizeof(fl)); | |
0660e03f ACM |
1166 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
1167 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1168 | |
1169 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
1170 | tot_len, IPPROTO_TCP, | |
1171 | buff->csum); | |
1172 | ||
1173 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 1174 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
1175 | fl.fl_ip_dport = t1->dest; |
1176 | fl.fl_ip_sport = t1->source; | |
beb8d13b | 1177 | security_skb_classify_flow(skb, &fl); |
1da177e4 | 1178 | |
e5047992 | 1179 | if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) { |
ecc51b6d | 1180 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
e5047992 | 1181 | ip6_xmit(ctl_sk, buff, &fl, NULL, 0); |
ecc51b6d | 1182 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); |
1da177e4 | 1183 | return; |
ecc51b6d | 1184 | } |
1da177e4 LT |
1185 | } |
1186 | ||
1187 | kfree_skb(buff); | |
1188 | } | |
1189 | ||
1190 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1191 | { | |
8feaf0c0 | 1192 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 1193 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 1194 | |
cfb6eeb4 | 1195 | tcp_v6_send_ack(tcptw, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 ACM |
1196 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
1197 | tcptw->tw_ts_recent); | |
1da177e4 | 1198 | |
8feaf0c0 | 1199 | inet_twsk_put(tw); |
1da177e4 LT |
1200 | } |
1201 | ||
60236fdd | 1202 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req) |
1da177e4 | 1203 | { |
cfb6eeb4 | 1204 | 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 |
1205 | } |
1206 | ||
1207 | ||
1208 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
1209 | { | |
60236fdd | 1210 | struct request_sock *req, **prev; |
aa8223c7 | 1211 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
1212 | struct sock *nsk; |
1213 | ||
1214 | /* Find possible connection requests. */ | |
8129765a | 1215 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
1216 | &ipv6_hdr(skb)->saddr, |
1217 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 LT |
1218 | if (req) |
1219 | return tcp_check_req(sk, skb, req, prev); | |
1220 | ||
d86e0dac PE |
1221 | nsk = __inet6_lookup_established(sk->sk_net, &tcp_hashinfo, |
1222 | &ipv6_hdr(skb)->saddr, th->source, | |
1223 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
1224 | |
1225 | if (nsk) { | |
1226 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1227 | bh_lock_sock(nsk); | |
1228 | return nsk; | |
1229 | } | |
9469c7b4 | 1230 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1231 | return NULL; |
1232 | } | |
1233 | ||
c6aefafb | 1234 | #ifdef CONFIG_SYN_COOKIES |
1da177e4 | 1235 | if (!th->rst && !th->syn && th->ack) |
c6aefafb | 1236 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1237 | #endif |
1238 | return sk; | |
1239 | } | |
1240 | ||
1da177e4 LT |
1241 | /* FIXME: this is substantially similar to the ipv4 code. |
1242 | * Can some kind of merge be done? -- erics | |
1243 | */ | |
1244 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1245 | { | |
ca304b61 | 1246 | struct inet6_request_sock *treq; |
1da177e4 LT |
1247 | struct ipv6_pinfo *np = inet6_sk(sk); |
1248 | struct tcp_options_received tmp_opt; | |
1249 | struct tcp_sock *tp = tcp_sk(sk); | |
60236fdd | 1250 | struct request_sock *req = NULL; |
1da177e4 | 1251 | __u32 isn = TCP_SKB_CB(skb)->when; |
c6aefafb GG |
1252 | #ifdef CONFIG_SYN_COOKIES |
1253 | int want_cookie = 0; | |
1254 | #else | |
1255 | #define want_cookie 0 | |
1256 | #endif | |
1da177e4 LT |
1257 | |
1258 | if (skb->protocol == htons(ETH_P_IP)) | |
1259 | return tcp_v4_conn_request(sk, skb); | |
1260 | ||
1261 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1262 | goto drop; |
1da177e4 | 1263 | |
463c84b9 | 1264 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 | 1265 | if (net_ratelimit()) |
c6aefafb GG |
1266 | syn_flood_warning(skb); |
1267 | #ifdef CONFIG_SYN_COOKIES | |
1268 | if (sysctl_tcp_syncookies) | |
1269 | want_cookie = 1; | |
1270 | else | |
1271 | #endif | |
1ab1457c | 1272 | goto drop; |
1da177e4 LT |
1273 | } |
1274 | ||
463c84b9 | 1275 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1276 | goto drop; |
1277 | ||
ca304b61 | 1278 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1279 | if (req == NULL) |
1280 | goto drop; | |
1281 | ||
cfb6eeb4 YH |
1282 | #ifdef CONFIG_TCP_MD5SIG |
1283 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
1284 | #endif | |
1285 | ||
1da177e4 LT |
1286 | tcp_clear_options(&tmp_opt); |
1287 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1288 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
1289 | ||
1290 | tcp_parse_options(skb, &tmp_opt, 0); | |
1291 | ||
c6aefafb GG |
1292 | if (want_cookie) { |
1293 | tcp_clear_options(&tmp_opt); | |
1294 | tmp_opt.saw_tstamp = 0; | |
1295 | } | |
1296 | ||
1da177e4 LT |
1297 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1298 | tcp_openreq_init(req, &tmp_opt, skb); | |
1299 | ||
ca304b61 | 1300 | treq = inet6_rsk(req); |
0660e03f ACM |
1301 | ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr); |
1302 | ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr); | |
2e6599cb | 1303 | treq->pktopts = NULL; |
c6aefafb GG |
1304 | if (!want_cookie) |
1305 | TCP_ECN_create_request(req, tcp_hdr(skb)); | |
1306 | ||
1307 | if (want_cookie) { | |
1308 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); | |
1309 | } else if (!isn) { | |
1310 | if (ipv6_opt_accepted(sk, skb) || | |
1311 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1312 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1313 | atomic_inc(&skb->users); | |
1314 | treq->pktopts = skb; | |
1315 | } | |
1316 | treq->iif = sk->sk_bound_dev_if; | |
1da177e4 | 1317 | |
c6aefafb GG |
1318 | /* So that link locals have meaning */ |
1319 | if (!sk->sk_bound_dev_if && | |
1320 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1321 | treq->iif = inet6_iif(skb); | |
1da177e4 | 1322 | |
a94f723d | 1323 | isn = tcp_v6_init_sequence(skb); |
c6aefafb | 1324 | } |
1da177e4 | 1325 | |
2e6599cb | 1326 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1327 | |
4237c75c VY |
1328 | security_inet_conn_request(sk, skb, req); |
1329 | ||
fd80eb94 | 1330 | if (tcp_v6_send_synack(sk, req)) |
1da177e4 LT |
1331 | goto drop; |
1332 | ||
c6aefafb GG |
1333 | if (!want_cookie) { |
1334 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); | |
1335 | return 0; | |
1336 | } | |
1da177e4 LT |
1337 | |
1338 | drop: | |
1339 | if (req) | |
60236fdd | 1340 | reqsk_free(req); |
1da177e4 | 1341 | |
1da177e4 LT |
1342 | return 0; /* don't send reset */ |
1343 | } | |
1344 | ||
1345 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1346 | struct request_sock *req, |
1da177e4 LT |
1347 | struct dst_entry *dst) |
1348 | { | |
ca304b61 | 1349 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
1350 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1351 | struct tcp6_sock *newtcp6sk; | |
1352 | struct inet_sock *newinet; | |
1353 | struct tcp_sock *newtp; | |
1354 | struct sock *newsk; | |
1355 | struct ipv6_txoptions *opt; | |
cfb6eeb4 YH |
1356 | #ifdef CONFIG_TCP_MD5SIG |
1357 | struct tcp_md5sig_key *key; | |
1358 | #endif | |
1da177e4 LT |
1359 | |
1360 | if (skb->protocol == htons(ETH_P_IP)) { | |
1361 | /* | |
1362 | * v6 mapped | |
1363 | */ | |
1364 | ||
1365 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1366 | ||
1ab1457c | 1367 | if (newsk == NULL) |
1da177e4 LT |
1368 | return NULL; |
1369 | ||
1370 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1371 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1372 | ||
1373 | newinet = inet_sk(newsk); | |
1374 | newnp = inet6_sk(newsk); | |
1375 | newtp = tcp_sk(newsk); | |
1376 | ||
1377 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1378 | ||
1379 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
1380 | newinet->daddr); | |
1381 | ||
1382 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
1383 | newinet->saddr); | |
1384 | ||
1385 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1386 | ||
8292a17a | 1387 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1388 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1389 | #ifdef CONFIG_TCP_MD5SIG |
1390 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1391 | #endif | |
1392 | ||
1da177e4 LT |
1393 | newnp->pktoptions = NULL; |
1394 | newnp->opt = NULL; | |
505cbfc5 | 1395 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1396 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 | 1397 | |
e6848976 ACM |
1398 | /* |
1399 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1400 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1401 | * that function for the gory details. -acme | |
1da177e4 | 1402 | */ |
1da177e4 LT |
1403 | |
1404 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1405 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1406 | Sync it now. |
1407 | */ | |
d83d8461 | 1408 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1409 | |
1410 | return newsk; | |
1411 | } | |
1412 | ||
1413 | opt = np->opt; | |
1414 | ||
1415 | if (sk_acceptq_is_full(sk)) | |
1416 | goto out_overflow; | |
1417 | ||
1da177e4 LT |
1418 | if (dst == NULL) { |
1419 | struct in6_addr *final_p = NULL, final; | |
1420 | struct flowi fl; | |
1421 | ||
1422 | memset(&fl, 0, sizeof(fl)); | |
1423 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1424 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
1425 | if (opt && opt->srcrt) { |
1426 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1427 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1428 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1429 | final_p = &final; | |
1430 | } | |
2e6599cb | 1431 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1432 | fl.oif = sk->sk_bound_dev_if; |
2e6599cb | 1433 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
1da177e4 | 1434 | fl.fl_ip_sport = inet_sk(sk)->sport; |
4237c75c | 1435 | security_req_classify_flow(req, &fl); |
1da177e4 LT |
1436 | |
1437 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1438 | goto out; | |
1439 | ||
1440 | if (final_p) | |
1441 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1442 | ||
1443 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
1444 | goto out; | |
1ab1457c | 1445 | } |
1da177e4 LT |
1446 | |
1447 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1448 | if (newsk == NULL) | |
1449 | goto out; | |
1450 | ||
e6848976 ACM |
1451 | /* |
1452 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1453 | * count here, tcp_create_openreq_child now does this for us, see the | |
1454 | * comment in that function for the gory details. -acme | |
1455 | */ | |
1da177e4 | 1456 | |
59eed279 | 1457 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1458 | __ip6_dst_store(newsk, dst, NULL, NULL); |
1da177e4 LT |
1459 | |
1460 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1461 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1462 | ||
1463 | newtp = tcp_sk(newsk); | |
1464 | newinet = inet_sk(newsk); | |
1465 | newnp = inet6_sk(newsk); | |
1466 | ||
1467 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1468 | ||
2e6599cb ACM |
1469 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1470 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1471 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1472 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 | 1473 | |
1ab1457c | 1474 | /* Now IPv6 options... |
1da177e4 LT |
1475 | |
1476 | First: no IPv4 options. | |
1477 | */ | |
1478 | newinet->opt = NULL; | |
d35690be | 1479 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1480 | |
1481 | /* Clone RX bits */ | |
1482 | newnp->rxopt.all = np->rxopt.all; | |
1483 | ||
1484 | /* Clone pktoptions received with SYN */ | |
1485 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1486 | if (treq->pktopts != NULL) { |
1487 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1488 | kfree_skb(treq->pktopts); | |
1489 | treq->pktopts = NULL; | |
1da177e4 LT |
1490 | if (newnp->pktoptions) |
1491 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1492 | } | |
1493 | newnp->opt = NULL; | |
505cbfc5 | 1494 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1495 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
1496 | |
1497 | /* Clone native IPv6 options from listening socket (if any) | |
1498 | ||
1499 | Yes, keeping reference count would be much more clever, | |
1500 | but we make one more one thing there: reattach optmem | |
1501 | to newsk. | |
1502 | */ | |
1503 | if (opt) { | |
1504 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1505 | if (opt != np->opt) | |
1506 | sock_kfree_s(sk, opt, opt->tot_len); | |
1507 | } | |
1508 | ||
d83d8461 | 1509 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1510 | if (newnp->opt) |
d83d8461 ACM |
1511 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1512 | newnp->opt->opt_flen); | |
1da177e4 | 1513 | |
5d424d5a | 1514 | tcp_mtup_init(newsk); |
1da177e4 LT |
1515 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1516 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1517 | tcp_initialize_rcv_mss(newsk); | |
1518 | ||
1519 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
1520 | ||
cfb6eeb4 YH |
1521 | #ifdef CONFIG_TCP_MD5SIG |
1522 | /* Copy over the MD5 key from the original socket */ | |
1523 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1524 | /* We're using one, so create a matching key | |
1525 | * on the newsk structure. If we fail to get | |
1526 | * memory, then we end up not copying the key | |
1527 | * across. Shucks. | |
1528 | */ | |
af879cc7 ACM |
1529 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1530 | if (newkey != NULL) | |
cfb6eeb4 YH |
1531 | tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr, |
1532 | newkey, key->keylen); | |
cfb6eeb4 YH |
1533 | } |
1534 | #endif | |
1535 | ||
ab1e0a13 ACM |
1536 | __inet6_hash(newsk); |
1537 | inet_inherit_port(sk, newsk); | |
1da177e4 LT |
1538 | |
1539 | return newsk; | |
1540 | ||
1541 | out_overflow: | |
1542 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
1543 | out: | |
1544 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
1545 | if (opt && opt != np->opt) | |
1546 | sock_kfree_s(sk, opt, opt->tot_len); | |
1547 | dst_release(dst); | |
1548 | return NULL; | |
1549 | } | |
1550 | ||
b51655b9 | 1551 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1552 | { |
84fa7933 | 1553 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
aa8223c7 | 1554 | if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1555 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1556 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1557 | return 0; |
fb286bb2 | 1558 | } |
1da177e4 | 1559 | } |
fb286bb2 | 1560 | |
aa8223c7 | 1561 | skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len, |
0660e03f ACM |
1562 | &ipv6_hdr(skb)->saddr, |
1563 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1564 | |
1da177e4 | 1565 | if (skb->len <= 76) { |
fb286bb2 | 1566 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1567 | } |
1568 | return 0; | |
1569 | } | |
1570 | ||
1571 | /* The socket must have it's spinlock held when we get | |
1572 | * here. | |
1573 | * | |
1574 | * We have a potential double-lock case here, so even when | |
1575 | * doing backlog processing we use the BH locking scheme. | |
1576 | * This is because we cannot sleep with the original spinlock | |
1577 | * held. | |
1578 | */ | |
1579 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1580 | { | |
1581 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1582 | struct tcp_sock *tp; | |
1583 | struct sk_buff *opt_skb = NULL; | |
1584 | ||
1585 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1586 | goes to IPv4 receive handler and backlogged. | |
1587 | From backlog it always goes here. Kerboom... | |
1588 | Fortunately, tcp_rcv_established and rcv_established | |
1589 | handle them correctly, but it is not case with | |
1590 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1591 | */ | |
1592 | ||
1593 | if (skb->protocol == htons(ETH_P_IP)) | |
1594 | return tcp_v4_do_rcv(sk, skb); | |
1595 | ||
cfb6eeb4 YH |
1596 | #ifdef CONFIG_TCP_MD5SIG |
1597 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1598 | goto discard; | |
1599 | #endif | |
1600 | ||
fda9ef5d | 1601 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1602 | goto discard; |
1603 | ||
1604 | /* | |
1605 | * socket locking is here for SMP purposes as backlog rcv | |
1606 | * is currently called with bh processing disabled. | |
1607 | */ | |
1608 | ||
1609 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1610 | ||
1611 | Yes, guys, it is the only place in our code, where we | |
1612 | may make it not affecting IPv4. | |
1613 | The rest of code is protocol independent, | |
1614 | and I do not like idea to uglify IPv4. | |
1615 | ||
1616 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1617 | looks not very well thought. For now we latch | |
1618 | options, received in the last packet, enqueued | |
1619 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1620 | --ANK (980728) |
1da177e4 LT |
1621 | */ |
1622 | if (np->rxopt.all) | |
1623 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1624 | ||
1625 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1626 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1627 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1628 | goto reset; |
1629 | TCP_CHECK_TIMER(sk); | |
1630 | if (opt_skb) | |
1631 | goto ipv6_pktoptions; | |
1632 | return 0; | |
1633 | } | |
1634 | ||
ab6a5bb6 | 1635 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1636 | goto csum_err; |
1637 | ||
1ab1457c | 1638 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1639 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1640 | if (!nsk) | |
1641 | goto discard; | |
1642 | ||
1643 | /* | |
1644 | * Queue it on the new socket if the new socket is active, | |
1645 | * otherwise we just shortcircuit this and continue with | |
1646 | * the new socket.. | |
1647 | */ | |
1ab1457c | 1648 | if(nsk != sk) { |
1da177e4 LT |
1649 | if (tcp_child_process(sk, nsk, skb)) |
1650 | goto reset; | |
1651 | if (opt_skb) | |
1652 | __kfree_skb(opt_skb); | |
1653 | return 0; | |
1654 | } | |
1655 | } | |
1656 | ||
1657 | TCP_CHECK_TIMER(sk); | |
aa8223c7 | 1658 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 LT |
1659 | goto reset; |
1660 | TCP_CHECK_TIMER(sk); | |
1661 | if (opt_skb) | |
1662 | goto ipv6_pktoptions; | |
1663 | return 0; | |
1664 | ||
1665 | reset: | |
cfb6eeb4 | 1666 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1667 | discard: |
1668 | if (opt_skb) | |
1669 | __kfree_skb(opt_skb); | |
1670 | kfree_skb(skb); | |
1671 | return 0; | |
1672 | csum_err: | |
1673 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1674 | goto discard; | |
1675 | ||
1676 | ||
1677 | ipv6_pktoptions: | |
1678 | /* Do you ask, what is it? | |
1679 | ||
1680 | 1. skb was enqueued by tcp. | |
1681 | 2. skb is added to tail of read queue, rather than out of order. | |
1682 | 3. socket is not in passive state. | |
1683 | 4. Finally, it really contains options, which user wants to receive. | |
1684 | */ | |
1685 | tp = tcp_sk(sk); | |
1686 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1687 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1688 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1689 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1690 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1691 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
1da177e4 LT |
1692 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1693 | skb_set_owner_r(opt_skb, sk); | |
1694 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1695 | } else { | |
1696 | __kfree_skb(opt_skb); | |
1697 | opt_skb = xchg(&np->pktoptions, NULL); | |
1698 | } | |
1699 | } | |
1700 | ||
1701 | if (opt_skb) | |
1702 | kfree_skb(opt_skb); | |
1703 | return 0; | |
1704 | } | |
1705 | ||
e5bbef20 | 1706 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1707 | { |
1ab1457c | 1708 | struct tcphdr *th; |
1da177e4 LT |
1709 | struct sock *sk; |
1710 | int ret; | |
1711 | ||
1712 | if (skb->pkt_type != PACKET_HOST) | |
1713 | goto discard_it; | |
1714 | ||
1715 | /* | |
1716 | * Count it even if it's bad. | |
1717 | */ | |
1718 | TCP_INC_STATS_BH(TCP_MIB_INSEGS); | |
1719 | ||
1720 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1721 | goto discard_it; | |
1722 | ||
aa8223c7 | 1723 | th = tcp_hdr(skb); |
1da177e4 LT |
1724 | |
1725 | if (th->doff < sizeof(struct tcphdr)/4) | |
1726 | goto bad_packet; | |
1727 | if (!pskb_may_pull(skb, th->doff*4)) | |
1728 | goto discard_it; | |
1729 | ||
60476372 | 1730 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1da177e4 LT |
1731 | goto bad_packet; |
1732 | ||
aa8223c7 | 1733 | th = tcp_hdr(skb); |
1da177e4 LT |
1734 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1735 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1736 | skb->len - th->doff*4); | |
1737 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1738 | TCP_SKB_CB(skb)->when = 0; | |
0660e03f | 1739 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 LT |
1740 | TCP_SKB_CB(skb)->sacked = 0; |
1741 | ||
c346dca1 | 1742 | sk = __inet6_lookup(dev_net(skb->dev), &tcp_hashinfo, |
d86e0dac PE |
1743 | &ipv6_hdr(skb)->saddr, th->source, |
1744 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), | |
1745 | inet6_iif(skb)); | |
1da177e4 LT |
1746 | |
1747 | if (!sk) | |
1748 | goto no_tcp_socket; | |
1749 | ||
1750 | process: | |
1751 | if (sk->sk_state == TCP_TIME_WAIT) | |
1752 | goto do_time_wait; | |
1753 | ||
1754 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1755 | goto discard_and_relse; | |
1756 | ||
fda9ef5d | 1757 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1758 | goto discard_and_relse; |
1759 | ||
1760 | skb->dev = NULL; | |
1761 | ||
293b9c42 | 1762 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1763 | ret = 0; |
1764 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1765 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1766 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a DM |
1767 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
1768 | tp->ucopy.dma_chan = get_softnet_dma(); | |
1ab1457c YH |
1769 | if (tp->ucopy.dma_chan) |
1770 | ret = tcp_v6_do_rcv(sk, skb); | |
1771 | else | |
1a2449a8 CL |
1772 | #endif |
1773 | { | |
1774 | if (!tcp_prequeue(sk, skb)) | |
1775 | ret = tcp_v6_do_rcv(sk, skb); | |
1776 | } | |
1da177e4 LT |
1777 | } else |
1778 | sk_add_backlog(sk, skb); | |
1779 | bh_unlock_sock(sk); | |
1780 | ||
1781 | sock_put(sk); | |
1782 | return ret ? -1 : 0; | |
1783 | ||
1784 | no_tcp_socket: | |
1785 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1786 | goto discard_it; | |
1787 | ||
1788 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1789 | bad_packet: | |
1790 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1791 | } else { | |
cfb6eeb4 | 1792 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1793 | } |
1794 | ||
1795 | discard_it: | |
1796 | ||
1797 | /* | |
1798 | * Discard frame | |
1799 | */ | |
1800 | ||
1801 | kfree_skb(skb); | |
1802 | return 0; | |
1803 | ||
1804 | discard_and_relse: | |
1805 | sock_put(sk); | |
1806 | goto discard_it; | |
1807 | ||
1808 | do_time_wait: | |
1809 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1810 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1811 | goto discard_it; |
1812 | } | |
1813 | ||
1814 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1815 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
9469c7b4 | 1816 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1817 | goto discard_it; |
1818 | } | |
1819 | ||
9469c7b4 | 1820 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1821 | case TCP_TW_SYN: |
1822 | { | |
1823 | struct sock *sk2; | |
1824 | ||
c346dca1 | 1825 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
0660e03f | 1826 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1827 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1828 | if (sk2 != NULL) { |
295ff7ed ACM |
1829 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1830 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1831 | inet_twsk_put(tw); | |
1da177e4 LT |
1832 | sk = sk2; |
1833 | goto process; | |
1834 | } | |
1835 | /* Fall through to ACK */ | |
1836 | } | |
1837 | case TCP_TW_ACK: | |
1838 | tcp_v6_timewait_ack(sk, skb); | |
1839 | break; | |
1840 | case TCP_TW_RST: | |
1841 | goto no_tcp_socket; | |
1842 | case TCP_TW_SUCCESS:; | |
1843 | } | |
1844 | goto discard_it; | |
1845 | } | |
1846 | ||
1da177e4 LT |
1847 | static int tcp_v6_remember_stamp(struct sock *sk) |
1848 | { | |
1849 | /* Alas, not yet... */ | |
1850 | return 0; | |
1851 | } | |
1852 | ||
8292a17a | 1853 | static struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1854 | .queue_xmit = inet6_csk_xmit, |
1855 | .send_check = tcp_v6_send_check, | |
1856 | .rebuild_header = inet6_sk_rebuild_header, | |
1857 | .conn_request = tcp_v6_conn_request, | |
1858 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1859 | .remember_stamp = tcp_v6_remember_stamp, | |
1860 | .net_header_len = sizeof(struct ipv6hdr), | |
1861 | .setsockopt = ipv6_setsockopt, | |
1862 | .getsockopt = ipv6_getsockopt, | |
1863 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1864 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1865 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1866 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1867 | .compat_setsockopt = compat_ipv6_setsockopt, |
1868 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1869 | #endif |
1da177e4 LT |
1870 | }; |
1871 | ||
cfb6eeb4 | 1872 | #ifdef CONFIG_TCP_MD5SIG |
a928630a | 1873 | static struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 YH |
1874 | .md5_lookup = tcp_v6_md5_lookup, |
1875 | .calc_md5_hash = tcp_v6_calc_md5_hash, | |
1876 | .md5_add = tcp_v6_md5_add_func, | |
1877 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1878 | }; |
a928630a | 1879 | #endif |
cfb6eeb4 | 1880 | |
1da177e4 LT |
1881 | /* |
1882 | * TCP over IPv4 via INET6 API | |
1883 | */ | |
1884 | ||
8292a17a | 1885 | static struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1886 | .queue_xmit = ip_queue_xmit, |
1887 | .send_check = tcp_v4_send_check, | |
1888 | .rebuild_header = inet_sk_rebuild_header, | |
1889 | .conn_request = tcp_v6_conn_request, | |
1890 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1891 | .remember_stamp = tcp_v4_remember_stamp, | |
1892 | .net_header_len = sizeof(struct iphdr), | |
1893 | .setsockopt = ipv6_setsockopt, | |
1894 | .getsockopt = ipv6_getsockopt, | |
1895 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1896 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1897 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1898 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1899 | .compat_setsockopt = compat_ipv6_setsockopt, |
1900 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1901 | #endif |
1da177e4 LT |
1902 | }; |
1903 | ||
cfb6eeb4 | 1904 | #ifdef CONFIG_TCP_MD5SIG |
a928630a | 1905 | static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 YH |
1906 | .md5_lookup = tcp_v4_md5_lookup, |
1907 | .calc_md5_hash = tcp_v4_calc_md5_hash, | |
1908 | .md5_add = tcp_v6_md5_add_func, | |
1909 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1910 | }; |
a928630a | 1911 | #endif |
cfb6eeb4 | 1912 | |
1da177e4 LT |
1913 | /* NOTE: A lot of things set to zero explicitly by call to |
1914 | * sk_alloc() so need not be done here. | |
1915 | */ | |
1916 | static int tcp_v6_init_sock(struct sock *sk) | |
1917 | { | |
6687e988 | 1918 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1919 | struct tcp_sock *tp = tcp_sk(sk); |
1920 | ||
1921 | skb_queue_head_init(&tp->out_of_order_queue); | |
1922 | tcp_init_xmit_timers(sk); | |
1923 | tcp_prequeue_init(tp); | |
1924 | ||
6687e988 | 1925 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1926 | tp->mdev = TCP_TIMEOUT_INIT; |
1927 | ||
1928 | /* So many TCP implementations out there (incorrectly) count the | |
1929 | * initial SYN frame in their delayed-ACK and congestion control | |
1930 | * algorithms that we must have the following bandaid to talk | |
1931 | * efficiently to them. -DaveM | |
1932 | */ | |
1933 | tp->snd_cwnd = 2; | |
1934 | ||
1935 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1936 | * initialization of these values. | |
1937 | */ | |
1938 | tp->snd_ssthresh = 0x7fffffff; | |
1939 | tp->snd_cwnd_clamp = ~0; | |
c1b4a7e6 | 1940 | tp->mss_cache = 536; |
1da177e4 LT |
1941 | |
1942 | tp->reordering = sysctl_tcp_reordering; | |
1943 | ||
1944 | sk->sk_state = TCP_CLOSE; | |
1945 | ||
8292a17a | 1946 | icsk->icsk_af_ops = &ipv6_specific; |
6687e988 | 1947 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
d83d8461 | 1948 | icsk->icsk_sync_mss = tcp_sync_mss; |
1da177e4 LT |
1949 | sk->sk_write_space = sk_stream_write_space; |
1950 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1951 | ||
cfb6eeb4 YH |
1952 | #ifdef CONFIG_TCP_MD5SIG |
1953 | tp->af_specific = &tcp_sock_ipv6_specific; | |
1954 | #endif | |
1955 | ||
1da177e4 LT |
1956 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
1957 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1958 | ||
1959 | atomic_inc(&tcp_sockets_allocated); | |
1960 | ||
1961 | return 0; | |
1962 | } | |
1963 | ||
1964 | static int tcp_v6_destroy_sock(struct sock *sk) | |
1965 | { | |
cfb6eeb4 YH |
1966 | #ifdef CONFIG_TCP_MD5SIG |
1967 | /* Clean up the MD5 key list */ | |
1968 | if (tcp_sk(sk)->md5sig_info) | |
1969 | tcp_v6_clear_md5_list(sk); | |
1970 | #endif | |
1da177e4 LT |
1971 | tcp_v4_destroy_sock(sk); |
1972 | return inet6_destroy_sock(sk); | |
1973 | } | |
1974 | ||
952a10be | 1975 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1976 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1977 | static void get_openreq6(struct seq_file *seq, |
60236fdd | 1978 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 1979 | { |
1da177e4 | 1980 | int ttd = req->expires - jiffies; |
ca304b61 ACM |
1981 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1982 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1983 | |
1984 | if (ttd < 0) | |
1985 | ttd = 0; | |
1986 | ||
1da177e4 LT |
1987 | seq_printf(seq, |
1988 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1989 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1990 | i, | |
1991 | src->s6_addr32[0], src->s6_addr32[1], | |
1992 | src->s6_addr32[2], src->s6_addr32[3], | |
1993 | ntohs(inet_sk(sk)->sport), | |
1994 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1995 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1996 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1997 | TCP_SYN_RECV, |
1998 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
1999 | 1, /* timers active (only the expire timer) */ |
2000 | jiffies_to_clock_t(ttd), | |
1da177e4 LT |
2001 | req->retrans, |
2002 | uid, | |
1ab1457c | 2003 | 0, /* non standard timer */ |
1da177e4 LT |
2004 | 0, /* open_requests have no inode */ |
2005 | 0, req); | |
2006 | } | |
2007 | ||
2008 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
2009 | { | |
2010 | struct in6_addr *dest, *src; | |
2011 | __u16 destp, srcp; | |
2012 | int timer_active; | |
2013 | unsigned long timer_expires; | |
2014 | struct inet_sock *inet = inet_sk(sp); | |
2015 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 2016 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
2017 | struct ipv6_pinfo *np = inet6_sk(sp); |
2018 | ||
2019 | dest = &np->daddr; | |
2020 | src = &np->rcv_saddr; | |
2021 | destp = ntohs(inet->dport); | |
2022 | srcp = ntohs(inet->sport); | |
463c84b9 ACM |
2023 | |
2024 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 2025 | timer_active = 1; |
463c84b9 ACM |
2026 | timer_expires = icsk->icsk_timeout; |
2027 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 2028 | timer_active = 4; |
463c84b9 | 2029 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
2030 | } else if (timer_pending(&sp->sk_timer)) { |
2031 | timer_active = 2; | |
2032 | timer_expires = sp->sk_timer.expires; | |
2033 | } else { | |
2034 | timer_active = 0; | |
2035 | timer_expires = jiffies; | |
2036 | } | |
2037 | ||
2038 | seq_printf(seq, | |
2039 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2040 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n", | |
2041 | i, | |
2042 | src->s6_addr32[0], src->s6_addr32[1], | |
2043 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2044 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2045 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 2046 | sp->sk_state, |
47da8ee6 SS |
2047 | tp->write_seq-tp->snd_una, |
2048 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 LT |
2049 | timer_active, |
2050 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 2051 | icsk->icsk_retransmits, |
1da177e4 | 2052 | sock_i_uid(sp), |
6687e988 | 2053 | icsk->icsk_probes_out, |
1da177e4 LT |
2054 | sock_i_ino(sp), |
2055 | atomic_read(&sp->sk_refcnt), sp, | |
463c84b9 ACM |
2056 | icsk->icsk_rto, |
2057 | icsk->icsk_ack.ato, | |
2058 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, | |
1da177e4 LT |
2059 | tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh |
2060 | ); | |
2061 | } | |
2062 | ||
1ab1457c | 2063 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 2064 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
2065 | { |
2066 | struct in6_addr *dest, *src; | |
2067 | __u16 destp, srcp; | |
0fa1a53e | 2068 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
2069 | int ttd = tw->tw_ttd - jiffies; |
2070 | ||
2071 | if (ttd < 0) | |
2072 | ttd = 0; | |
2073 | ||
0fa1a53e ACM |
2074 | dest = &tw6->tw_v6_daddr; |
2075 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
2076 | destp = ntohs(tw->tw_dport); |
2077 | srcp = ntohs(tw->tw_sport); | |
2078 | ||
2079 | seq_printf(seq, | |
2080 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
2081 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
2082 | i, | |
2083 | src->s6_addr32[0], src->s6_addr32[1], | |
2084 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2085 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2086 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2087 | tw->tw_substate, 0, 0, | |
2088 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2089 | atomic_read(&tw->tw_refcnt), tw); | |
2090 | } | |
2091 | ||
1da177e4 LT |
2092 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
2093 | { | |
2094 | struct tcp_iter_state *st; | |
2095 | ||
2096 | if (v == SEQ_START_TOKEN) { | |
2097 | seq_puts(seq, | |
2098 | " sl " | |
2099 | "local_address " | |
2100 | "remote_address " | |
2101 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2102 | " uid timeout inode\n"); | |
2103 | goto out; | |
2104 | } | |
2105 | st = seq->private; | |
2106 | ||
2107 | switch (st->state) { | |
2108 | case TCP_SEQ_STATE_LISTENING: | |
2109 | case TCP_SEQ_STATE_ESTABLISHED: | |
2110 | get_tcp6_sock(seq, v, st->num); | |
2111 | break; | |
2112 | case TCP_SEQ_STATE_OPENREQ: | |
2113 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
2114 | break; | |
2115 | case TCP_SEQ_STATE_TIME_WAIT: | |
2116 | get_timewait6_sock(seq, v, st->num); | |
2117 | break; | |
2118 | } | |
2119 | out: | |
2120 | return 0; | |
2121 | } | |
2122 | ||
2123 | static struct file_operations tcp6_seq_fops; | |
2124 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { | |
2125 | .owner = THIS_MODULE, | |
2126 | .name = "tcp6", | |
2127 | .family = AF_INET6, | |
2128 | .seq_show = tcp6_seq_show, | |
2129 | .seq_fops = &tcp6_seq_fops, | |
2130 | }; | |
2131 | ||
6f8b13bc | 2132 | int tcp6_proc_init(struct net *net) |
1da177e4 | 2133 | { |
6f8b13bc | 2134 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2135 | } |
2136 | ||
6f8b13bc | 2137 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2138 | { |
6f8b13bc | 2139 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2140 | } |
2141 | #endif | |
2142 | ||
c5a432f1 ED |
2143 | DEFINE_PROTO_INUSE(tcpv6) |
2144 | ||
1da177e4 LT |
2145 | struct proto tcpv6_prot = { |
2146 | .name = "TCPv6", | |
2147 | .owner = THIS_MODULE, | |
2148 | .close = tcp_close, | |
2149 | .connect = tcp_v6_connect, | |
2150 | .disconnect = tcp_disconnect, | |
463c84b9 | 2151 | .accept = inet_csk_accept, |
1da177e4 LT |
2152 | .ioctl = tcp_ioctl, |
2153 | .init = tcp_v6_init_sock, | |
2154 | .destroy = tcp_v6_destroy_sock, | |
2155 | .shutdown = tcp_shutdown, | |
2156 | .setsockopt = tcp_setsockopt, | |
2157 | .getsockopt = tcp_getsockopt, | |
1da177e4 LT |
2158 | .recvmsg = tcp_recvmsg, |
2159 | .backlog_rcv = tcp_v6_do_rcv, | |
2160 | .hash = tcp_v6_hash, | |
ab1e0a13 ACM |
2161 | .unhash = inet_unhash, |
2162 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2163 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2164 | .sockets_allocated = &tcp_sockets_allocated, | |
2165 | .memory_allocated = &tcp_memory_allocated, | |
2166 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2167 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2168 | .sysctl_mem = sysctl_tcp_mem, |
2169 | .sysctl_wmem = sysctl_tcp_wmem, | |
2170 | .sysctl_rmem = sysctl_tcp_rmem, | |
2171 | .max_header = MAX_TCP_HEADER, | |
2172 | .obj_size = sizeof(struct tcp6_sock), | |
6d6ee43e | 2173 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2174 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2175 | .h.hashinfo = &tcp_hashinfo, |
543d9cfe ACM |
2176 | #ifdef CONFIG_COMPAT |
2177 | .compat_setsockopt = compat_tcp_setsockopt, | |
2178 | .compat_getsockopt = compat_tcp_getsockopt, | |
2179 | #endif | |
c5a432f1 | 2180 | REF_PROTO_INUSE(tcpv6) |
1da177e4 LT |
2181 | }; |
2182 | ||
2183 | static struct inet6_protocol tcpv6_protocol = { | |
2184 | .handler = tcp_v6_rcv, | |
2185 | .err_handler = tcp_v6_err, | |
a430a43d | 2186 | .gso_send_check = tcp_v6_gso_send_check, |
adcfc7d0 | 2187 | .gso_segment = tcp_tso_segment, |
1da177e4 LT |
2188 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
2189 | }; | |
2190 | ||
1da177e4 LT |
2191 | static struct inet_protosw tcpv6_protosw = { |
2192 | .type = SOCK_STREAM, | |
2193 | .protocol = IPPROTO_TCP, | |
2194 | .prot = &tcpv6_prot, | |
2195 | .ops = &inet6_stream_ops, | |
2196 | .capability = -1, | |
2197 | .no_check = 0, | |
d83d8461 ACM |
2198 | .flags = INET_PROTOSW_PERMANENT | |
2199 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2200 | }; |
2201 | ||
93ec926b DL |
2202 | static int tcpv6_net_init(struct net *net) |
2203 | { | |
2204 | int err; | |
2205 | struct socket *sock; | |
2206 | struct sock *sk; | |
2207 | ||
2208 | err = inet_csk_ctl_sock_create(&sock, PF_INET6, SOCK_RAW, IPPROTO_TCP); | |
2209 | if (err) | |
2210 | return err; | |
2211 | ||
2212 | net->ipv6.tcp_sk = sk = sock->sk; | |
2213 | sk_change_net(sk, net); | |
2214 | return err; | |
2215 | } | |
2216 | ||
2217 | static void tcpv6_net_exit(struct net *net) | |
2218 | { | |
2219 | sk_release_kernel(net->ipv6.tcp_sk); | |
2220 | } | |
2221 | ||
2222 | static struct pernet_operations tcpv6_net_ops = { | |
2223 | .init = tcpv6_net_init, | |
2224 | .exit = tcpv6_net_exit, | |
2225 | }; | |
2226 | ||
7f4e4868 | 2227 | int __init tcpv6_init(void) |
1da177e4 | 2228 | { |
7f4e4868 DL |
2229 | int ret; |
2230 | ||
2231 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2232 | if (ret) | |
2233 | goto out; | |
2234 | ||
1da177e4 | 2235 | /* register inet6 protocol */ |
7f4e4868 DL |
2236 | ret = inet6_register_protosw(&tcpv6_protosw); |
2237 | if (ret) | |
2238 | goto out_tcpv6_protocol; | |
2239 | ||
93ec926b | 2240 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2241 | if (ret) |
2242 | goto out_tcpv6_protosw; | |
2243 | out: | |
2244 | return ret; | |
ae0f7d5f | 2245 | |
7f4e4868 DL |
2246 | out_tcpv6_protocol: |
2247 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2248 | out_tcpv6_protosw: | |
2249 | inet6_unregister_protosw(&tcpv6_protosw); | |
2250 | goto out; | |
2251 | } | |
2252 | ||
09f7709f | 2253 | void tcpv6_exit(void) |
7f4e4868 | 2254 | { |
93ec926b | 2255 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2256 | inet6_unregister_protosw(&tcpv6_protosw); |
2257 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2258 | } |