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1 | /* |
2 | * TCP over IPv6 |
3 | * Linux INET6 implementation |
4 | * |
5 | * Authors: |
6 | * Pedro Roque <roque@di.fc.ul.pt> |
7 | * |
8 | * Based on: |
9 | * linux/net/ipv4/tcp.c |
10 | * linux/net/ipv4/tcp_input.c |
11 | * linux/net/ipv4/tcp_output.c |
12 | * |
13 | * Fixes: |
14 | * Hideaki YOSHIFUJI : sin6_scope_id support |
15 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which |
16 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind |
17 | * a single port at the same time. |
18 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file. |
19 | * |
20 | * This program is free software; you can redistribute it and/or |
21 | * modify it under the terms of the GNU General Public License |
22 | * as published by the Free Software Foundation; either version |
23 | * 2 of the License, or (at your option) any later version. |
24 | */ |
25 | |
26 | #include <linux/bottom_half.h> |
27 | #include <linux/module.h> |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> |
30 | #include <linux/socket.h> |
31 | #include <linux/sockios.h> |
32 | #include <linux/net.h> |
33 | #include <linux/jiffies.h> |
34 | #include <linux/in.h> |
35 | #include <linux/in6.h> |
36 | #include <linux/netdevice.h> |
37 | #include <linux/init.h> |
38 | #include <linux/jhash.h> |
39 | #include <linux/ipsec.h> |
40 | #include <linux/times.h> |
41 | #include <linux/slab.h> |
42 | #include <linux/uaccess.h> |
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> |
49 | #include <net/inet6_hashtables.h> |
50 | #include <net/inet6_connection_sock.h> |
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> |
59 | #include <net/snmp.h> |
60 | #include <net/dsfield.h> |
61 | #include <net/timewait_sock.h> |
62 | #include <net/netdma.h> |
63 | #include <net/inet_common.h> |
64 | #include <net/secure_seq.h> |
65 | #include <net/tcp_memcontrol.h> |
66 | #include <net/busy_poll.h> |
67 | |
68 | #include <linux/proc_fs.h> |
69 | #include <linux/seq_file.h> |
70 | |
71 | #include <linux/crypto.h> |
72 | #include <linux/scatterlist.h> |
73 | |
74 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
75 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
76 | struct request_sock *req); |
77 | |
78 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); |
79 | |
80 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
81 | static const struct inet_connection_sock_af_ops ipv6_specific; |
82 | #ifdef CONFIG_TCP_MD5SIG |
83 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
84 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; |
85 | #else |
86 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, |
87 | const struct in6_addr *addr) |
88 | { |
89 | return NULL; |
90 | } |
91 | #endif |
92 | |
93 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
94 | { |
95 | struct dst_entry *dst = skb_dst(skb); |
96 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
97 | |
98 | dst_hold(dst); |
99 | sk->sk_rx_dst = dst; |
100 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; |
101 | if (rt->rt6i_node) |
102 | inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum; |
103 | } |
104 | |
105 | static void tcp_v6_hash(struct sock *sk) |
106 | { |
107 | if (sk->sk_state != TCP_CLOSE) { |
108 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
109 | tcp_prot.hash(sk); |
110 | return; |
111 | } |
112 | local_bh_disable(); |
113 | __inet6_hash(sk, NULL); |
114 | local_bh_enable(); |
115 | } |
116 | } |
117 | |
118 | static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) |
119 | { |
120 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
121 | ipv6_hdr(skb)->saddr.s6_addr32, |
122 | tcp_hdr(skb)->dest, |
123 | tcp_hdr(skb)->source); |
124 | } |
125 | |
126 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
127 | int addr_len) |
128 | { |
129 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; |
130 | struct inet_sock *inet = inet_sk(sk); |
131 | struct inet_connection_sock *icsk = inet_csk(sk); |
132 | struct ipv6_pinfo *np = inet6_sk(sk); |
133 | struct tcp_sock *tp = tcp_sk(sk); |
134 | struct in6_addr *saddr = NULL, *final_p, final; |
135 | struct rt6_info *rt; |
136 | struct flowi6 fl6; |
137 | struct dst_entry *dst; |
138 | int addr_type; |
139 | int err; |
140 | |
141 | if (addr_len < SIN6_LEN_RFC2133) |
142 | return -EINVAL; |
143 | |
144 | if (usin->sin6_family != AF_INET6) |
145 | return -EAFNOSUPPORT; |
146 | |
147 | memset(&fl6, 0, sizeof(fl6)); |
148 | |
149 | if (np->sndflow) { |
150 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
151 | IP6_ECN_flow_init(fl6.flowlabel); |
152 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { |
153 | struct ip6_flowlabel *flowlabel; |
154 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
155 | if (flowlabel == NULL) |
156 | return -EINVAL; |
157 | fl6_sock_release(flowlabel); |
158 | } |
159 | } |
160 | |
161 | /* |
162 | * connect() to INADDR_ANY means loopback (BSD'ism). |
163 | */ |
164 | |
165 | if (ipv6_addr_any(&usin->sin6_addr)) |
166 | usin->sin6_addr.s6_addr[15] = 0x1; |
167 | |
168 | addr_type = ipv6_addr_type(&usin->sin6_addr); |
169 | |
170 | if (addr_type & IPV6_ADDR_MULTICAST) |
171 | return -ENETUNREACH; |
172 | |
173 | if (addr_type&IPV6_ADDR_LINKLOCAL) { |
174 | if (addr_len >= sizeof(struct sockaddr_in6) && |
175 | usin->sin6_scope_id) { |
176 | /* If interface is set while binding, indices |
177 | * must coincide. |
178 | */ |
179 | if (sk->sk_bound_dev_if && |
180 | sk->sk_bound_dev_if != usin->sin6_scope_id) |
181 | return -EINVAL; |
182 | |
183 | sk->sk_bound_dev_if = usin->sin6_scope_id; |
184 | } |
185 | |
186 | /* Connect to link-local address requires an interface */ |
187 | if (!sk->sk_bound_dev_if) |
188 | return -EINVAL; |
189 | } |
190 | |
191 | if (tp->rx_opt.ts_recent_stamp && |
192 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
193 | tp->rx_opt.ts_recent = 0; |
194 | tp->rx_opt.ts_recent_stamp = 0; |
195 | tp->write_seq = 0; |
196 | } |
197 | |
198 | sk->sk_v6_daddr = usin->sin6_addr; |
199 | np->flow_label = fl6.flowlabel; |
200 | |
201 | /* |
202 | * TCP over IPv4 |
203 | */ |
204 | |
205 | if (addr_type == IPV6_ADDR_MAPPED) { |
206 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
207 | struct sockaddr_in sin; |
208 | |
209 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); |
210 | |
211 | if (__ipv6_only_sock(sk)) |
212 | return -ENETUNREACH; |
213 | |
214 | sin.sin_family = AF_INET; |
215 | sin.sin_port = usin->sin6_port; |
216 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; |
217 | |
218 | icsk->icsk_af_ops = &ipv6_mapped; |
219 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
220 | #ifdef CONFIG_TCP_MD5SIG |
221 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; |
222 | #endif |
223 | |
224 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); |
225 | |
226 | if (err) { |
227 | icsk->icsk_ext_hdr_len = exthdrlen; |
228 | icsk->icsk_af_ops = &ipv6_specific; |
229 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
230 | #ifdef CONFIG_TCP_MD5SIG |
231 | tp->af_specific = &tcp_sock_ipv6_specific; |
232 | #endif |
233 | goto failure; |
234 | } else { |
235 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
236 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, |
237 | &sk->sk_v6_rcv_saddr); |
238 | } |
239 | |
240 | return err; |
241 | } |
242 | |
243 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
244 | saddr = &sk->sk_v6_rcv_saddr; |
245 | |
246 | fl6.flowi6_proto = IPPROTO_TCP; |
247 | fl6.daddr = sk->sk_v6_daddr; |
248 | fl6.saddr = saddr ? *saddr : np->saddr; |
249 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
250 | fl6.flowi6_mark = sk->sk_mark; |
251 | fl6.fl6_dport = usin->sin6_port; |
252 | fl6.fl6_sport = inet->inet_sport; |
253 | |
254 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
255 | |
256 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
257 | |
258 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
259 | if (IS_ERR(dst)) { |
260 | err = PTR_ERR(dst); |
261 | goto failure; |
262 | } |
263 | |
264 | if (saddr == NULL) { |
265 | saddr = &fl6.saddr; |
266 | sk->sk_v6_rcv_saddr = *saddr; |
267 | } |
268 | |
269 | /* set the source address */ |
270 | np->saddr = *saddr; |
271 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
272 | |
273 | sk->sk_gso_type = SKB_GSO_TCPV6; |
274 | __ip6_dst_store(sk, dst, NULL, NULL); |
275 | |
276 | rt = (struct rt6_info *) dst; |
277 | if (tcp_death_row.sysctl_tw_recycle && |
278 | !tp->rx_opt.ts_recent_stamp && |
279 | ipv6_addr_equal(&rt->rt6i_dst.addr, &sk->sk_v6_daddr)) |
280 | tcp_fetch_timewait_stamp(sk, dst); |
281 | |
282 | icsk->icsk_ext_hdr_len = 0; |
283 | if (np->opt) |
284 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
285 | np->opt->opt_nflen); |
286 | |
287 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); |
288 | |
289 | inet->inet_dport = usin->sin6_port; |
290 | |
291 | tcp_set_state(sk, TCP_SYN_SENT); |
292 | err = inet6_hash_connect(&tcp_death_row, sk); |
293 | if (err) |
294 | goto late_failure; |
295 | |
296 | if (!tp->write_seq && likely(!tp->repair)) |
297 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
298 | sk->sk_v6_daddr.s6_addr32, |
299 | inet->inet_sport, |
300 | inet->inet_dport); |
301 | |
302 | err = tcp_connect(sk); |
303 | if (err) |
304 | goto late_failure; |
305 | |
306 | return 0; |
307 | |
308 | late_failure: |
309 | tcp_set_state(sk, TCP_CLOSE); |
310 | __sk_dst_reset(sk); |
311 | failure: |
312 | inet->inet_dport = 0; |
313 | sk->sk_route_caps = 0; |
314 | return err; |
315 | } |
316 | |
317 | static void tcp_v6_mtu_reduced(struct sock *sk) |
318 | { |
319 | struct dst_entry *dst; |
320 | |
321 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) |
322 | return; |
323 | |
324 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); |
325 | if (!dst) |
326 | return; |
327 | |
328 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
329 | tcp_sync_mss(sk, dst_mtu(dst)); |
330 | tcp_simple_retransmit(sk); |
331 | } |
332 | } |
333 | |
334 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
335 | u8 type, u8 code, int offset, __be32 info) |
336 | { |
337 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
338 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
339 | struct ipv6_pinfo *np; |
340 | struct sock *sk; |
341 | int err; |
342 | struct tcp_sock *tp; |
343 | __u32 seq; |
344 | struct net *net = dev_net(skb->dev); |
345 | |
346 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
347 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
348 | |
349 | if (sk == NULL) { |
350 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
351 | ICMP6_MIB_INERRORS); |
352 | return; |
353 | } |
354 | |
355 | if (sk->sk_state == TCP_TIME_WAIT) { |
356 | inet_twsk_put(inet_twsk(sk)); |
357 | return; |
358 | } |
359 | |
360 | bh_lock_sock(sk); |
361 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
362 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
363 | |
364 | if (sk->sk_state == TCP_CLOSE) |
365 | goto out; |
366 | |
367 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
368 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); |
369 | goto out; |
370 | } |
371 | |
372 | tp = tcp_sk(sk); |
373 | seq = ntohl(th->seq); |
374 | if (sk->sk_state != TCP_LISTEN && |
375 | !between(seq, tp->snd_una, tp->snd_nxt)) { |
376 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
377 | goto out; |
378 | } |
379 | |
380 | np = inet6_sk(sk); |
381 | |
382 | if (type == NDISC_REDIRECT) { |
383 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); |
384 | |
385 | if (dst) |
386 | dst->ops->redirect(dst, sk, skb); |
387 | goto out; |
388 | } |
389 | |
390 | if (type == ICMPV6_PKT_TOOBIG) { |
391 | /* We are not interested in TCP_LISTEN and open_requests |
392 | * (SYN-ACKs send out by Linux are always <576bytes so |
393 | * they should go through unfragmented). |
394 | */ |
395 | if (sk->sk_state == TCP_LISTEN) |
396 | goto out; |
397 | |
398 | if (!ip6_sk_accept_pmtu(sk)) |
399 | goto out; |
400 | |
401 | tp->mtu_info = ntohl(info); |
402 | if (!sock_owned_by_user(sk)) |
403 | tcp_v6_mtu_reduced(sk); |
404 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
405 | &tp->tsq_flags)) |
406 | sock_hold(sk); |
407 | goto out; |
408 | } |
409 | |
410 | icmpv6_err_convert(type, code, &err); |
411 | |
412 | /* Might be for an request_sock */ |
413 | switch (sk->sk_state) { |
414 | struct request_sock *req, **prev; |
415 | case TCP_LISTEN: |
416 | if (sock_owned_by_user(sk)) |
417 | goto out; |
418 | |
419 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
420 | &hdr->saddr, inet6_iif(skb)); |
421 | if (!req) |
422 | goto out; |
423 | |
424 | /* ICMPs are not backlogged, hence we cannot get |
425 | * an established socket here. |
426 | */ |
427 | WARN_ON(req->sk != NULL); |
428 | |
429 | if (seq != tcp_rsk(req)->snt_isn) { |
430 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
431 | goto out; |
432 | } |
433 | |
434 | inet_csk_reqsk_queue_drop(sk, req, prev); |
435 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
436 | goto out; |
437 | |
438 | case TCP_SYN_SENT: |
439 | case TCP_SYN_RECV: /* Cannot happen. |
440 | It can, it SYNs are crossed. --ANK */ |
441 | if (!sock_owned_by_user(sk)) { |
442 | sk->sk_err = err; |
443 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ |
444 | |
445 | tcp_done(sk); |
446 | } else |
447 | sk->sk_err_soft = err; |
448 | goto out; |
449 | } |
450 | |
451 | if (!sock_owned_by_user(sk) && np->recverr) { |
452 | sk->sk_err = err; |
453 | sk->sk_error_report(sk); |
454 | } else |
455 | sk->sk_err_soft = err; |
456 | |
457 | out: |
458 | bh_unlock_sock(sk); |
459 | sock_put(sk); |
460 | } |
461 | |
462 | |
463 | static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst, |
464 | struct flowi6 *fl6, |
465 | struct request_sock *req, |
466 | u16 queue_mapping) |
467 | { |
468 | struct inet_request_sock *ireq = inet_rsk(req); |
469 | struct ipv6_pinfo *np = inet6_sk(sk); |
470 | struct sk_buff *skb; |
471 | int err = -ENOMEM; |
472 | |
473 | /* First, grab a route. */ |
474 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL) |
475 | goto done; |
476 | |
477 | skb = tcp_make_synack(sk, dst, req, NULL); |
478 | |
479 | if (skb) { |
480 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
481 | &ireq->ir_v6_rmt_addr); |
482 | |
483 | fl6->daddr = ireq->ir_v6_rmt_addr; |
484 | if (np->repflow && (ireq->pktopts != NULL)) |
485 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); |
486 | |
487 | skb_set_queue_mapping(skb, queue_mapping); |
488 | err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass); |
489 | err = net_xmit_eval(err); |
490 | } |
491 | |
492 | done: |
493 | return err; |
494 | } |
495 | |
496 | static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req) |
497 | { |
498 | struct flowi6 fl6; |
499 | int res; |
500 | |
501 | res = tcp_v6_send_synack(sk, NULL, &fl6, req, 0); |
502 | if (!res) { |
503 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); |
504 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPSYNRETRANS); |
505 | } |
506 | return res; |
507 | } |
508 | |
509 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
510 | { |
511 | kfree_skb(inet_rsk(req)->pktopts); |
512 | } |
513 | |
514 | #ifdef CONFIG_TCP_MD5SIG |
515 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, |
516 | const struct in6_addr *addr) |
517 | { |
518 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
519 | } |
520 | |
521 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, |
522 | struct sock *addr_sk) |
523 | { |
524 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
525 | } |
526 | |
527 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, |
528 | struct request_sock *req) |
529 | { |
530 | return tcp_v6_md5_do_lookup(sk, &inet_rsk(req)->ir_v6_rmt_addr); |
531 | } |
532 | |
533 | static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval, |
534 | int optlen) |
535 | { |
536 | struct tcp_md5sig cmd; |
537 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; |
538 | |
539 | if (optlen < sizeof(cmd)) |
540 | return -EINVAL; |
541 | |
542 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
543 | return -EFAULT; |
544 | |
545 | if (sin6->sin6_family != AF_INET6) |
546 | return -EINVAL; |
547 | |
548 | if (!cmd.tcpm_keylen) { |
549 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
550 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
551 | AF_INET); |
552 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
553 | AF_INET6); |
554 | } |
555 | |
556 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) |
557 | return -EINVAL; |
558 | |
559 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
560 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
561 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
562 | |
563 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
564 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
565 | } |
566 | |
567 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
568 | const struct in6_addr *daddr, |
569 | const struct in6_addr *saddr, int nbytes) |
570 | { |
571 | struct tcp6_pseudohdr *bp; |
572 | struct scatterlist sg; |
573 | |
574 | bp = &hp->md5_blk.ip6; |
575 | /* 1. TCP pseudo-header (RFC2460) */ |
576 | bp->saddr = *saddr; |
577 | bp->daddr = *daddr; |
578 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
579 | bp->len = cpu_to_be32(nbytes); |
580 | |
581 | sg_init_one(&sg, bp, sizeof(*bp)); |
582 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); |
583 | } |
584 | |
585 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
586 | const struct in6_addr *daddr, struct in6_addr *saddr, |
587 | const struct tcphdr *th) |
588 | { |
589 | struct tcp_md5sig_pool *hp; |
590 | struct hash_desc *desc; |
591 | |
592 | hp = tcp_get_md5sig_pool(); |
593 | if (!hp) |
594 | goto clear_hash_noput; |
595 | desc = &hp->md5_desc; |
596 | |
597 | if (crypto_hash_init(desc)) |
598 | goto clear_hash; |
599 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) |
600 | goto clear_hash; |
601 | if (tcp_md5_hash_header(hp, th)) |
602 | goto clear_hash; |
603 | if (tcp_md5_hash_key(hp, key)) |
604 | goto clear_hash; |
605 | if (crypto_hash_final(desc, md5_hash)) |
606 | goto clear_hash; |
607 | |
608 | tcp_put_md5sig_pool(); |
609 | return 0; |
610 | |
611 | clear_hash: |
612 | tcp_put_md5sig_pool(); |
613 | clear_hash_noput: |
614 | memset(md5_hash, 0, 16); |
615 | return 1; |
616 | } |
617 | |
618 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
619 | const struct sock *sk, |
620 | const struct request_sock *req, |
621 | const struct sk_buff *skb) |
622 | { |
623 | const struct in6_addr *saddr, *daddr; |
624 | struct tcp_md5sig_pool *hp; |
625 | struct hash_desc *desc; |
626 | const struct tcphdr *th = tcp_hdr(skb); |
627 | |
628 | if (sk) { |
629 | saddr = &inet6_sk(sk)->saddr; |
630 | daddr = &sk->sk_v6_daddr; |
631 | } else if (req) { |
632 | saddr = &inet_rsk(req)->ir_v6_loc_addr; |
633 | daddr = &inet_rsk(req)->ir_v6_rmt_addr; |
634 | } else { |
635 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
636 | saddr = &ip6h->saddr; |
637 | daddr = &ip6h->daddr; |
638 | } |
639 | |
640 | hp = tcp_get_md5sig_pool(); |
641 | if (!hp) |
642 | goto clear_hash_noput; |
643 | desc = &hp->md5_desc; |
644 | |
645 | if (crypto_hash_init(desc)) |
646 | goto clear_hash; |
647 | |
648 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) |
649 | goto clear_hash; |
650 | if (tcp_md5_hash_header(hp, th)) |
651 | goto clear_hash; |
652 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) |
653 | goto clear_hash; |
654 | if (tcp_md5_hash_key(hp, key)) |
655 | goto clear_hash; |
656 | if (crypto_hash_final(desc, md5_hash)) |
657 | goto clear_hash; |
658 | |
659 | tcp_put_md5sig_pool(); |
660 | return 0; |
661 | |
662 | clear_hash: |
663 | tcp_put_md5sig_pool(); |
664 | clear_hash_noput: |
665 | memset(md5_hash, 0, 16); |
666 | return 1; |
667 | } |
668 | |
669 | static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
670 | { |
671 | const __u8 *hash_location = NULL; |
672 | struct tcp_md5sig_key *hash_expected; |
673 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
674 | const struct tcphdr *th = tcp_hdr(skb); |
675 | int genhash; |
676 | u8 newhash[16]; |
677 | |
678 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); |
679 | hash_location = tcp_parse_md5sig_option(th); |
680 | |
681 | /* We've parsed the options - do we have a hash? */ |
682 | if (!hash_expected && !hash_location) |
683 | return 0; |
684 | |
685 | if (hash_expected && !hash_location) { |
686 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
687 | return 1; |
688 | } |
689 | |
690 | if (!hash_expected && hash_location) { |
691 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
692 | return 1; |
693 | } |
694 | |
695 | /* check the signature */ |
696 | genhash = tcp_v6_md5_hash_skb(newhash, |
697 | hash_expected, |
698 | NULL, NULL, skb); |
699 | |
700 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
701 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
702 | genhash ? "failed" : "mismatch", |
703 | &ip6h->saddr, ntohs(th->source), |
704 | &ip6h->daddr, ntohs(th->dest)); |
705 | return 1; |
706 | } |
707 | return 0; |
708 | } |
709 | #endif |
710 | |
711 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
712 | .family = AF_INET6, |
713 | .obj_size = sizeof(struct tcp6_request_sock), |
714 | .rtx_syn_ack = tcp_v6_rtx_synack, |
715 | .send_ack = tcp_v6_reqsk_send_ack, |
716 | .destructor = tcp_v6_reqsk_destructor, |
717 | .send_reset = tcp_v6_send_reset, |
718 | .syn_ack_timeout = tcp_syn_ack_timeout, |
719 | }; |
720 | |
721 | #ifdef CONFIG_TCP_MD5SIG |
722 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
723 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
724 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
725 | }; |
726 | #endif |
727 | |
728 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
729 | u32 tsval, u32 tsecr, int oif, |
730 | struct tcp_md5sig_key *key, int rst, u8 tclass, |
731 | u32 label) |
732 | { |
733 | const struct tcphdr *th = tcp_hdr(skb); |
734 | struct tcphdr *t1; |
735 | struct sk_buff *buff; |
736 | struct flowi6 fl6; |
737 | struct net *net = dev_net(skb_dst(skb)->dev); |
738 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
739 | unsigned int tot_len = sizeof(struct tcphdr); |
740 | struct dst_entry *dst; |
741 | __be32 *topt; |
742 | |
743 | if (tsecr) |
744 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
745 | #ifdef CONFIG_TCP_MD5SIG |
746 | if (key) |
747 | tot_len += TCPOLEN_MD5SIG_ALIGNED; |
748 | #endif |
749 | |
750 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
751 | GFP_ATOMIC); |
752 | if (buff == NULL) |
753 | return; |
754 | |
755 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
756 | |
757 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
758 | skb_reset_transport_header(buff); |
759 | |
760 | /* Swap the send and the receive. */ |
761 | memset(t1, 0, sizeof(*t1)); |
762 | t1->dest = th->source; |
763 | t1->source = th->dest; |
764 | t1->doff = tot_len / 4; |
765 | t1->seq = htonl(seq); |
766 | t1->ack_seq = htonl(ack); |
767 | t1->ack = !rst || !th->ack; |
768 | t1->rst = rst; |
769 | t1->window = htons(win); |
770 | |
771 | topt = (__be32 *)(t1 + 1); |
772 | |
773 | if (tsecr) { |
774 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
775 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); |
776 | *topt++ = htonl(tsval); |
777 | *topt++ = htonl(tsecr); |
778 | } |
779 | |
780 | #ifdef CONFIG_TCP_MD5SIG |
781 | if (key) { |
782 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
783 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); |
784 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, |
785 | &ipv6_hdr(skb)->saddr, |
786 | &ipv6_hdr(skb)->daddr, t1); |
787 | } |
788 | #endif |
789 | |
790 | memset(&fl6, 0, sizeof(fl6)); |
791 | fl6.daddr = ipv6_hdr(skb)->saddr; |
792 | fl6.saddr = ipv6_hdr(skb)->daddr; |
793 | fl6.flowlabel = label; |
794 | |
795 | buff->ip_summed = CHECKSUM_PARTIAL; |
796 | buff->csum = 0; |
797 | |
798 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
799 | |
800 | fl6.flowi6_proto = IPPROTO_TCP; |
801 | if (rt6_need_strict(&fl6.daddr) && !oif) |
802 | fl6.flowi6_oif = inet6_iif(skb); |
803 | else |
804 | fl6.flowi6_oif = oif; |
805 | fl6.fl6_dport = t1->dest; |
806 | fl6.fl6_sport = t1->source; |
807 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
808 | |
809 | /* Pass a socket to ip6_dst_lookup either it is for RST |
810 | * Underlying function will use this to retrieve the network |
811 | * namespace |
812 | */ |
813 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
814 | if (!IS_ERR(dst)) { |
815 | skb_dst_set(buff, dst); |
816 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
817 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
818 | if (rst) |
819 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); |
820 | return; |
821 | } |
822 | |
823 | kfree_skb(buff); |
824 | } |
825 | |
826 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
827 | { |
828 | const struct tcphdr *th = tcp_hdr(skb); |
829 | u32 seq = 0, ack_seq = 0; |
830 | struct tcp_md5sig_key *key = NULL; |
831 | #ifdef CONFIG_TCP_MD5SIG |
832 | const __u8 *hash_location = NULL; |
833 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
834 | unsigned char newhash[16]; |
835 | int genhash; |
836 | struct sock *sk1 = NULL; |
837 | #endif |
838 | int oif; |
839 | |
840 | if (th->rst) |
841 | return; |
842 | |
843 | if (!ipv6_unicast_destination(skb)) |
844 | return; |
845 | |
846 | #ifdef CONFIG_TCP_MD5SIG |
847 | hash_location = tcp_parse_md5sig_option(th); |
848 | if (!sk && hash_location) { |
849 | /* |
850 | * active side is lost. Try to find listening socket through |
851 | * source port, and then find md5 key through listening socket. |
852 | * we are not loose security here: |
853 | * Incoming packet is checked with md5 hash with finding key, |
854 | * no RST generated if md5 hash doesn't match. |
855 | */ |
856 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), |
857 | &tcp_hashinfo, &ipv6h->saddr, |
858 | th->source, &ipv6h->daddr, |
859 | ntohs(th->source), inet6_iif(skb)); |
860 | if (!sk1) |
861 | return; |
862 | |
863 | rcu_read_lock(); |
864 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); |
865 | if (!key) |
866 | goto release_sk1; |
867 | |
868 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb); |
869 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
870 | goto release_sk1; |
871 | } else { |
872 | key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; |
873 | } |
874 | #endif |
875 | |
876 | if (th->ack) |
877 | seq = ntohl(th->ack_seq); |
878 | else |
879 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - |
880 | (th->doff << 2); |
881 | |
882 | oif = sk ? sk->sk_bound_dev_if : 0; |
883 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0); |
884 | |
885 | #ifdef CONFIG_TCP_MD5SIG |
886 | release_sk1: |
887 | if (sk1) { |
888 | rcu_read_unlock(); |
889 | sock_put(sk1); |
890 | } |
891 | #endif |
892 | } |
893 | |
894 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, |
895 | u32 win, u32 tsval, u32 tsecr, int oif, |
896 | struct tcp_md5sig_key *key, u8 tclass, |
897 | u32 label) |
898 | { |
899 | tcp_v6_send_response(skb, seq, ack, win, tsval, tsecr, oif, key, 0, tclass, |
900 | label); |
901 | } |
902 | |
903 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) |
904 | { |
905 | struct inet_timewait_sock *tw = inet_twsk(sk); |
906 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
907 | |
908 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
909 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
910 | tcp_time_stamp + tcptw->tw_ts_offset, |
911 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
912 | tw->tw_tclass, (tw->tw_flowlabel << 12)); |
913 | |
914 | inet_twsk_put(tw); |
915 | } |
916 | |
917 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
918 | struct request_sock *req) |
919 | { |
920 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, |
921 | req->rcv_wnd, tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if, |
922 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), |
923 | 0, 0); |
924 | } |
925 | |
926 | |
927 | static struct sock *tcp_v6_hnd_req(struct sock *sk, struct sk_buff *skb) |
928 | { |
929 | struct request_sock *req, **prev; |
930 | const struct tcphdr *th = tcp_hdr(skb); |
931 | struct sock *nsk; |
932 | |
933 | /* Find possible connection requests. */ |
934 | req = inet6_csk_search_req(sk, &prev, th->source, |
935 | &ipv6_hdr(skb)->saddr, |
936 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); |
937 | if (req) |
938 | return tcp_check_req(sk, skb, req, prev, false); |
939 | |
940 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
941 | &ipv6_hdr(skb)->saddr, th->source, |
942 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); |
943 | |
944 | if (nsk) { |
945 | if (nsk->sk_state != TCP_TIME_WAIT) { |
946 | bh_lock_sock(nsk); |
947 | return nsk; |
948 | } |
949 | inet_twsk_put(inet_twsk(nsk)); |
950 | return NULL; |
951 | } |
952 | |
953 | #ifdef CONFIG_SYN_COOKIES |
954 | if (!th->syn) |
955 | sk = cookie_v6_check(sk, skb); |
956 | #endif |
957 | return sk; |
958 | } |
959 | |
960 | /* FIXME: this is substantially similar to the ipv4 code. |
961 | * Can some kind of merge be done? -- erics |
962 | */ |
963 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
964 | { |
965 | struct tcp_options_received tmp_opt; |
966 | struct request_sock *req; |
967 | struct inet_request_sock *ireq; |
968 | struct ipv6_pinfo *np = inet6_sk(sk); |
969 | struct tcp_sock *tp = tcp_sk(sk); |
970 | __u32 isn = TCP_SKB_CB(skb)->when; |
971 | struct dst_entry *dst = NULL; |
972 | struct flowi6 fl6; |
973 | bool want_cookie = false; |
974 | |
975 | if (skb->protocol == htons(ETH_P_IP)) |
976 | return tcp_v4_conn_request(sk, skb); |
977 | |
978 | if (!ipv6_unicast_destination(skb)) |
979 | goto drop; |
980 | |
981 | if ((sysctl_tcp_syncookies == 2 || |
982 | inet_csk_reqsk_queue_is_full(sk)) && !isn) { |
983 | want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6"); |
984 | if (!want_cookie) |
985 | goto drop; |
986 | } |
987 | |
988 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) { |
989 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
990 | goto drop; |
991 | } |
992 | |
993 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
994 | if (req == NULL) |
995 | goto drop; |
996 | |
997 | #ifdef CONFIG_TCP_MD5SIG |
998 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; |
999 | #endif |
1000 | |
1001 | tcp_clear_options(&tmp_opt); |
1002 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); |
1003 | tmp_opt.user_mss = tp->rx_opt.user_mss; |
1004 | tcp_parse_options(skb, &tmp_opt, 0, NULL); |
1005 | |
1006 | if (want_cookie && !tmp_opt.saw_tstamp) |
1007 | tcp_clear_options(&tmp_opt); |
1008 | |
1009 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1010 | tcp_openreq_init(req, &tmp_opt, skb); |
1011 | |
1012 | ireq = inet_rsk(req); |
1013 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; |
1014 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; |
1015 | if (!want_cookie || tmp_opt.tstamp_ok) |
1016 | TCP_ECN_create_request(req, skb, sock_net(sk)); |
1017 | |
1018 | ireq->ir_iif = sk->sk_bound_dev_if; |
1019 | |
1020 | /* So that link locals have meaning */ |
1021 | if (!sk->sk_bound_dev_if && |
1022 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
1023 | ireq->ir_iif = inet6_iif(skb); |
1024 | |
1025 | if (!isn) { |
1026 | if (ipv6_opt_accepted(sk, skb) || |
1027 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
1028 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim || |
1029 | np->repflow) { |
1030 | atomic_inc(&skb->users); |
1031 | ireq->pktopts = skb; |
1032 | } |
1033 | |
1034 | if (want_cookie) { |
1035 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); |
1036 | req->cookie_ts = tmp_opt.tstamp_ok; |
1037 | goto have_isn; |
1038 | } |
1039 | |
1040 | /* VJ's idea. We save last timestamp seen |
1041 | * from the destination in peer table, when entering |
1042 | * state TIME-WAIT, and check against it before |
1043 | * accepting new connection request. |
1044 | * |
1045 | * If "isn" is not zero, this request hit alive |
1046 | * timewait bucket, so that all the necessary checks |
1047 | * are made in the function processing timewait state. |
1048 | */ |
1049 | if (tmp_opt.saw_tstamp && |
1050 | tcp_death_row.sysctl_tw_recycle && |
1051 | (dst = inet6_csk_route_req(sk, &fl6, req)) != NULL) { |
1052 | if (!tcp_peer_is_proven(req, dst, true)) { |
1053 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); |
1054 | goto drop_and_release; |
1055 | } |
1056 | } |
1057 | /* Kill the following clause, if you dislike this way. */ |
1058 | else if (!sysctl_tcp_syncookies && |
1059 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < |
1060 | (sysctl_max_syn_backlog >> 2)) && |
1061 | !tcp_peer_is_proven(req, dst, false)) { |
1062 | /* Without syncookies last quarter of |
1063 | * backlog is filled with destinations, |
1064 | * proven to be alive. |
1065 | * It means that we continue to communicate |
1066 | * to destinations, already remembered |
1067 | * to the moment of synflood. |
1068 | */ |
1069 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n", |
1070 | &ireq->ir_v6_rmt_addr, ntohs(tcp_hdr(skb)->source)); |
1071 | goto drop_and_release; |
1072 | } |
1073 | |
1074 | isn = tcp_v6_init_sequence(skb); |
1075 | } |
1076 | have_isn: |
1077 | tcp_rsk(req)->snt_isn = isn; |
1078 | |
1079 | if (security_inet_conn_request(sk, skb, req)) |
1080 | goto drop_and_release; |
1081 | |
1082 | if (tcp_v6_send_synack(sk, dst, &fl6, req, |
1083 | skb_get_queue_mapping(skb)) || |
1084 | want_cookie) |
1085 | goto drop_and_free; |
1086 | |
1087 | tcp_rsk(req)->snt_synack = tcp_time_stamp; |
1088 | tcp_rsk(req)->listener = NULL; |
1089 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1090 | return 0; |
1091 | |
1092 | drop_and_release: |
1093 | dst_release(dst); |
1094 | drop_and_free: |
1095 | reqsk_free(req); |
1096 | drop: |
1097 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1098 | return 0; /* don't send reset */ |
1099 | } |
1100 | |
1101 | static struct sock *tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, |
1102 | struct request_sock *req, |
1103 | struct dst_entry *dst) |
1104 | { |
1105 | struct inet_request_sock *ireq; |
1106 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1107 | struct tcp6_sock *newtcp6sk; |
1108 | struct inet_sock *newinet; |
1109 | struct tcp_sock *newtp; |
1110 | struct sock *newsk; |
1111 | #ifdef CONFIG_TCP_MD5SIG |
1112 | struct tcp_md5sig_key *key; |
1113 | #endif |
1114 | struct flowi6 fl6; |
1115 | |
1116 | if (skb->protocol == htons(ETH_P_IP)) { |
1117 | /* |
1118 | * v6 mapped |
1119 | */ |
1120 | |
1121 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); |
1122 | |
1123 | if (newsk == NULL) |
1124 | return NULL; |
1125 | |
1126 | newtcp6sk = (struct tcp6_sock *)newsk; |
1127 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; |
1128 | |
1129 | newinet = inet_sk(newsk); |
1130 | newnp = inet6_sk(newsk); |
1131 | newtp = tcp_sk(newsk); |
1132 | |
1133 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
1134 | |
1135 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newsk->sk_v6_daddr); |
1136 | |
1137 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1138 | |
1139 | newsk->sk_v6_rcv_saddr = newnp->saddr; |
1140 | |
1141 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1142 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
1143 | #ifdef CONFIG_TCP_MD5SIG |
1144 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; |
1145 | #endif |
1146 | |
1147 | newnp->ipv6_ac_list = NULL; |
1148 | newnp->ipv6_fl_list = NULL; |
1149 | newnp->pktoptions = NULL; |
1150 | newnp->opt = NULL; |
1151 | newnp->mcast_oif = inet6_iif(skb); |
1152 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1153 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
1154 | if (np->repflow) |
1155 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); |
1156 | |
1157 | /* |
1158 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count |
1159 | * here, tcp_create_openreq_child now does this for us, see the comment in |
1160 | * that function for the gory details. -acme |
1161 | */ |
1162 | |
1163 | /* It is tricky place. Until this moment IPv4 tcp |
1164 | worked with IPv6 icsk.icsk_af_ops. |
1165 | Sync it now. |
1166 | */ |
1167 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1168 | |
1169 | return newsk; |
1170 | } |
1171 | |
1172 | ireq = inet_rsk(req); |
1173 | |
1174 | if (sk_acceptq_is_full(sk)) |
1175 | goto out_overflow; |
1176 | |
1177 | if (!dst) { |
1178 | dst = inet6_csk_route_req(sk, &fl6, req); |
1179 | if (!dst) |
1180 | goto out; |
1181 | } |
1182 | |
1183 | newsk = tcp_create_openreq_child(sk, req, skb); |
1184 | if (newsk == NULL) |
1185 | goto out_nonewsk; |
1186 | |
1187 | /* |
1188 | * No need to charge this sock to the relevant IPv6 refcnt debug socks |
1189 | * count here, tcp_create_openreq_child now does this for us, see the |
1190 | * comment in that function for the gory details. -acme |
1191 | */ |
1192 | |
1193 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
1194 | __ip6_dst_store(newsk, dst, NULL, NULL); |
1195 | inet6_sk_rx_dst_set(newsk, skb); |
1196 | |
1197 | newtcp6sk = (struct tcp6_sock *)newsk; |
1198 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; |
1199 | |
1200 | newtp = tcp_sk(newsk); |
1201 | newinet = inet_sk(newsk); |
1202 | newnp = inet6_sk(newsk); |
1203 | |
1204 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
1205 | |
1206 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1207 | newnp->saddr = ireq->ir_v6_loc_addr; |
1208 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; |
1209 | newsk->sk_bound_dev_if = ireq->ir_iif; |
1210 | |
1211 | /* Now IPv6 options... |
1212 | |
1213 | First: no IPv4 options. |
1214 | */ |
1215 | newinet->inet_opt = NULL; |
1216 | newnp->ipv6_ac_list = NULL; |
1217 | newnp->ipv6_fl_list = NULL; |
1218 | |
1219 | /* Clone RX bits */ |
1220 | newnp->rxopt.all = np->rxopt.all; |
1221 | |
1222 | /* Clone pktoptions received with SYN */ |
1223 | newnp->pktoptions = NULL; |
1224 | if (ireq->pktopts != NULL) { |
1225 | newnp->pktoptions = skb_clone(ireq->pktopts, |
1226 | sk_gfp_atomic(sk, GFP_ATOMIC)); |
1227 | consume_skb(ireq->pktopts); |
1228 | ireq->pktopts = NULL; |
1229 | if (newnp->pktoptions) |
1230 | skb_set_owner_r(newnp->pktoptions, newsk); |
1231 | } |
1232 | newnp->opt = NULL; |
1233 | newnp->mcast_oif = inet6_iif(skb); |
1234 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1235 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
1236 | if (np->repflow) |
1237 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); |
1238 | |
1239 | /* Clone native IPv6 options from listening socket (if any) |
1240 | |
1241 | Yes, keeping reference count would be much more clever, |
1242 | but we make one more one thing there: reattach optmem |
1243 | to newsk. |
1244 | */ |
1245 | if (np->opt) |
1246 | newnp->opt = ipv6_dup_options(newsk, np->opt); |
1247 | |
1248 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1249 | if (newnp->opt) |
1250 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1251 | newnp->opt->opt_flen); |
1252 | |
1253 | tcp_sync_mss(newsk, dst_mtu(dst)); |
1254 | newtp->advmss = dst_metric_advmss(dst); |
1255 | if (tcp_sk(sk)->rx_opt.user_mss && |
1256 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) |
1257 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; |
1258 | |
1259 | tcp_initialize_rcv_mss(newsk); |
1260 | |
1261 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1262 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1263 | |
1264 | #ifdef CONFIG_TCP_MD5SIG |
1265 | /* Copy over the MD5 key from the original socket */ |
1266 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr); |
1267 | if (key != NULL) { |
1268 | /* We're using one, so create a matching key |
1269 | * on the newsk structure. If we fail to get |
1270 | * memory, then we end up not copying the key |
1271 | * across. Shucks. |
1272 | */ |
1273 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
1274 | AF_INET6, key->key, key->keylen, |
1275 | sk_gfp_atomic(sk, GFP_ATOMIC)); |
1276 | } |
1277 | #endif |
1278 | |
1279 | if (__inet_inherit_port(sk, newsk) < 0) { |
1280 | inet_csk_prepare_forced_close(newsk); |
1281 | tcp_done(newsk); |
1282 | goto out; |
1283 | } |
1284 | __inet6_hash(newsk, NULL); |
1285 | |
1286 | return newsk; |
1287 | |
1288 | out_overflow: |
1289 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
1290 | out_nonewsk: |
1291 | dst_release(dst); |
1292 | out: |
1293 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1294 | return NULL; |
1295 | } |
1296 | |
1297 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1298 | { |
1299 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
1300 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
1301 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
1302 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1303 | return 0; |
1304 | } |
1305 | } |
1306 | |
1307 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
1308 | &ipv6_hdr(skb)->saddr, |
1309 | &ipv6_hdr(skb)->daddr, 0)); |
1310 | |
1311 | if (skb->len <= 76) |
1312 | return __skb_checksum_complete(skb); |
1313 | return 0; |
1314 | } |
1315 | |
1316 | /* The socket must have it's spinlock held when we get |
1317 | * here. |
1318 | * |
1319 | * We have a potential double-lock case here, so even when |
1320 | * doing backlog processing we use the BH locking scheme. |
1321 | * This is because we cannot sleep with the original spinlock |
1322 | * held. |
1323 | */ |
1324 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) |
1325 | { |
1326 | struct ipv6_pinfo *np = inet6_sk(sk); |
1327 | struct tcp_sock *tp; |
1328 | struct sk_buff *opt_skb = NULL; |
1329 | |
1330 | /* Imagine: socket is IPv6. IPv4 packet arrives, |
1331 | goes to IPv4 receive handler and backlogged. |
1332 | From backlog it always goes here. Kerboom... |
1333 | Fortunately, tcp_rcv_established and rcv_established |
1334 | handle them correctly, but it is not case with |
1335 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK |
1336 | */ |
1337 | |
1338 | if (skb->protocol == htons(ETH_P_IP)) |
1339 | return tcp_v4_do_rcv(sk, skb); |
1340 | |
1341 | #ifdef CONFIG_TCP_MD5SIG |
1342 | if (tcp_v6_inbound_md5_hash(sk, skb)) |
1343 | goto discard; |
1344 | #endif |
1345 | |
1346 | if (sk_filter(sk, skb)) |
1347 | goto discard; |
1348 | |
1349 | /* |
1350 | * socket locking is here for SMP purposes as backlog rcv |
1351 | * is currently called with bh processing disabled. |
1352 | */ |
1353 | |
1354 | /* Do Stevens' IPV6_PKTOPTIONS. |
1355 | |
1356 | Yes, guys, it is the only place in our code, where we |
1357 | may make it not affecting IPv4. |
1358 | The rest of code is protocol independent, |
1359 | and I do not like idea to uglify IPv4. |
1360 | |
1361 | Actually, all the idea behind IPV6_PKTOPTIONS |
1362 | looks not very well thought. For now we latch |
1363 | options, received in the last packet, enqueued |
1364 | by tcp. Feel free to propose better solution. |
1365 | --ANK (980728) |
1366 | */ |
1367 | if (np->rxopt.all) |
1368 | opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC)); |
1369 | |
1370 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
1371 | struct dst_entry *dst = sk->sk_rx_dst; |
1372 | |
1373 | sock_rps_save_rxhash(sk, skb); |
1374 | if (dst) { |
1375 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || |
1376 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { |
1377 | dst_release(dst); |
1378 | sk->sk_rx_dst = NULL; |
1379 | } |
1380 | } |
1381 | |
1382 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
1383 | if (opt_skb) |
1384 | goto ipv6_pktoptions; |
1385 | return 0; |
1386 | } |
1387 | |
1388 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1389 | goto csum_err; |
1390 | |
1391 | if (sk->sk_state == TCP_LISTEN) { |
1392 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1393 | if (!nsk) |
1394 | goto discard; |
1395 | |
1396 | /* |
1397 | * Queue it on the new socket if the new socket is active, |
1398 | * otherwise we just shortcircuit this and continue with |
1399 | * the new socket.. |
1400 | */ |
1401 | if (nsk != sk) { |
1402 | sock_rps_save_rxhash(nsk, skb); |
1403 | if (tcp_child_process(sk, nsk, skb)) |
1404 | goto reset; |
1405 | if (opt_skb) |
1406 | __kfree_skb(opt_skb); |
1407 | return 0; |
1408 | } |
1409 | } else |
1410 | sock_rps_save_rxhash(sk, skb); |
1411 | |
1412 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1413 | goto reset; |
1414 | if (opt_skb) |
1415 | goto ipv6_pktoptions; |
1416 | return 0; |
1417 | |
1418 | reset: |
1419 | tcp_v6_send_reset(sk, skb); |
1420 | discard: |
1421 | if (opt_skb) |
1422 | __kfree_skb(opt_skb); |
1423 | kfree_skb(skb); |
1424 | return 0; |
1425 | csum_err: |
1426 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); |
1427 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1428 | goto discard; |
1429 | |
1430 | |
1431 | ipv6_pktoptions: |
1432 | /* Do you ask, what is it? |
1433 | |
1434 | 1. skb was enqueued by tcp. |
1435 | 2. skb is added to tail of read queue, rather than out of order. |
1436 | 3. socket is not in passive state. |
1437 | 4. Finally, it really contains options, which user wants to receive. |
1438 | */ |
1439 | tp = tcp_sk(sk); |
1440 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && |
1441 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { |
1442 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
1443 | np->mcast_oif = inet6_iif(opt_skb); |
1444 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
1445 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
1446 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1447 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
1448 | if (np->repflow) |
1449 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); |
1450 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1451 | skb_set_owner_r(opt_skb, sk); |
1452 | opt_skb = xchg(&np->pktoptions, opt_skb); |
1453 | } else { |
1454 | __kfree_skb(opt_skb); |
1455 | opt_skb = xchg(&np->pktoptions, NULL); |
1456 | } |
1457 | } |
1458 | |
1459 | kfree_skb(opt_skb); |
1460 | return 0; |
1461 | } |
1462 | |
1463 | static int tcp_v6_rcv(struct sk_buff *skb) |
1464 | { |
1465 | const struct tcphdr *th; |
1466 | const struct ipv6hdr *hdr; |
1467 | struct sock *sk; |
1468 | int ret; |
1469 | struct net *net = dev_net(skb->dev); |
1470 | |
1471 | if (skb->pkt_type != PACKET_HOST) |
1472 | goto discard_it; |
1473 | |
1474 | /* |
1475 | * Count it even if it's bad. |
1476 | */ |
1477 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1478 | |
1479 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) |
1480 | goto discard_it; |
1481 | |
1482 | th = tcp_hdr(skb); |
1483 | |
1484 | if (th->doff < sizeof(struct tcphdr)/4) |
1485 | goto bad_packet; |
1486 | if (!pskb_may_pull(skb, th->doff*4)) |
1487 | goto discard_it; |
1488 | |
1489 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1490 | goto csum_error; |
1491 | |
1492 | th = tcp_hdr(skb); |
1493 | hdr = ipv6_hdr(skb); |
1494 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1495 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + |
1496 | skb->len - th->doff*4); |
1497 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); |
1498 | TCP_SKB_CB(skb)->when = 0; |
1499 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); |
1500 | TCP_SKB_CB(skb)->sacked = 0; |
1501 | |
1502 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1503 | if (!sk) |
1504 | goto no_tcp_socket; |
1505 | |
1506 | process: |
1507 | if (sk->sk_state == TCP_TIME_WAIT) |
1508 | goto do_time_wait; |
1509 | |
1510 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1511 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); |
1512 | goto discard_and_relse; |
1513 | } |
1514 | |
1515 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1516 | goto discard_and_relse; |
1517 | |
1518 | if (sk_filter(sk, skb)) |
1519 | goto discard_and_relse; |
1520 | |
1521 | sk_mark_napi_id(sk, skb); |
1522 | skb->dev = NULL; |
1523 | |
1524 | bh_lock_sock_nested(sk); |
1525 | ret = 0; |
1526 | if (!sock_owned_by_user(sk)) { |
1527 | #ifdef CONFIG_NET_DMA |
1528 | struct tcp_sock *tp = tcp_sk(sk); |
1529 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
1530 | tp->ucopy.dma_chan = net_dma_find_channel(); |
1531 | if (tp->ucopy.dma_chan) |
1532 | ret = tcp_v6_do_rcv(sk, skb); |
1533 | else |
1534 | #endif |
1535 | { |
1536 | if (!tcp_prequeue(sk, skb)) |
1537 | ret = tcp_v6_do_rcv(sk, skb); |
1538 | } |
1539 | } else if (unlikely(sk_add_backlog(sk, skb, |
1540 | sk->sk_rcvbuf + sk->sk_sndbuf))) { |
1541 | bh_unlock_sock(sk); |
1542 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
1543 | goto discard_and_relse; |
1544 | } |
1545 | bh_unlock_sock(sk); |
1546 | |
1547 | sock_put(sk); |
1548 | return ret ? -1 : 0; |
1549 | |
1550 | no_tcp_socket: |
1551 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
1552 | goto discard_it; |
1553 | |
1554 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { |
1555 | csum_error: |
1556 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); |
1557 | bad_packet: |
1558 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1559 | } else { |
1560 | tcp_v6_send_reset(NULL, skb); |
1561 | } |
1562 | |
1563 | discard_it: |
1564 | kfree_skb(skb); |
1565 | return 0; |
1566 | |
1567 | discard_and_relse: |
1568 | sock_put(sk); |
1569 | goto discard_it; |
1570 | |
1571 | do_time_wait: |
1572 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
1573 | inet_twsk_put(inet_twsk(sk)); |
1574 | goto discard_it; |
1575 | } |
1576 | |
1577 | if (skb->len < (th->doff<<2)) { |
1578 | inet_twsk_put(inet_twsk(sk)); |
1579 | goto bad_packet; |
1580 | } |
1581 | if (tcp_checksum_complete(skb)) { |
1582 | inet_twsk_put(inet_twsk(sk)); |
1583 | goto csum_error; |
1584 | } |
1585 | |
1586 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1587 | case TCP_TW_SYN: |
1588 | { |
1589 | struct sock *sk2; |
1590 | |
1591 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
1592 | &ipv6_hdr(skb)->saddr, th->source, |
1593 | &ipv6_hdr(skb)->daddr, |
1594 | ntohs(th->dest), inet6_iif(skb)); |
1595 | if (sk2 != NULL) { |
1596 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1597 | inet_twsk_deschedule(tw, &tcp_death_row); |
1598 | inet_twsk_put(tw); |
1599 | sk = sk2; |
1600 | goto process; |
1601 | } |
1602 | /* Fall through to ACK */ |
1603 | } |
1604 | case TCP_TW_ACK: |
1605 | tcp_v6_timewait_ack(sk, skb); |
1606 | break; |
1607 | case TCP_TW_RST: |
1608 | goto no_tcp_socket; |
1609 | case TCP_TW_SUCCESS: |
1610 | ; |
1611 | } |
1612 | goto discard_it; |
1613 | } |
1614 | |
1615 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1616 | { |
1617 | const struct ipv6hdr *hdr; |
1618 | const struct tcphdr *th; |
1619 | struct sock *sk; |
1620 | |
1621 | if (skb->pkt_type != PACKET_HOST) |
1622 | return; |
1623 | |
1624 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) |
1625 | return; |
1626 | |
1627 | hdr = ipv6_hdr(skb); |
1628 | th = tcp_hdr(skb); |
1629 | |
1630 | if (th->doff < sizeof(struct tcphdr) / 4) |
1631 | return; |
1632 | |
1633 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
1634 | &hdr->saddr, th->source, |
1635 | &hdr->daddr, ntohs(th->dest), |
1636 | inet6_iif(skb)); |
1637 | if (sk) { |
1638 | skb->sk = sk; |
1639 | skb->destructor = sock_edemux; |
1640 | if (sk->sk_state != TCP_TIME_WAIT) { |
1641 | struct dst_entry *dst = sk->sk_rx_dst; |
1642 | |
1643 | if (dst) |
1644 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
1645 | if (dst && |
1646 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
1647 | skb_dst_set_noref(skb, dst); |
1648 | } |
1649 | } |
1650 | } |
1651 | |
1652 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1653 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), |
1654 | .twsk_unique = tcp_twsk_unique, |
1655 | .twsk_destructor = tcp_twsk_destructor, |
1656 | }; |
1657 | |
1658 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
1659 | .queue_xmit = inet6_csk_xmit, |
1660 | .send_check = tcp_v6_send_check, |
1661 | .rebuild_header = inet6_sk_rebuild_header, |
1662 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
1663 | .conn_request = tcp_v6_conn_request, |
1664 | .syn_recv_sock = tcp_v6_syn_recv_sock, |
1665 | .net_header_len = sizeof(struct ipv6hdr), |
1666 | .net_frag_header_len = sizeof(struct frag_hdr), |
1667 | .setsockopt = ipv6_setsockopt, |
1668 | .getsockopt = ipv6_getsockopt, |
1669 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
1670 | .sockaddr_len = sizeof(struct sockaddr_in6), |
1671 | .bind_conflict = inet6_csk_bind_conflict, |
1672 | #ifdef CONFIG_COMPAT |
1673 | .compat_setsockopt = compat_ipv6_setsockopt, |
1674 | .compat_getsockopt = compat_ipv6_getsockopt, |
1675 | #endif |
1676 | }; |
1677 | |
1678 | #ifdef CONFIG_TCP_MD5SIG |
1679 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
1680 | .md5_lookup = tcp_v6_md5_lookup, |
1681 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
1682 | .md5_parse = tcp_v6_parse_md5_keys, |
1683 | }; |
1684 | #endif |
1685 | |
1686 | /* |
1687 | * TCP over IPv4 via INET6 API |
1688 | */ |
1689 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
1690 | .queue_xmit = ip_queue_xmit, |
1691 | .send_check = tcp_v4_send_check, |
1692 | .rebuild_header = inet_sk_rebuild_header, |
1693 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
1694 | .conn_request = tcp_v6_conn_request, |
1695 | .syn_recv_sock = tcp_v6_syn_recv_sock, |
1696 | .net_header_len = sizeof(struct iphdr), |
1697 | .setsockopt = ipv6_setsockopt, |
1698 | .getsockopt = ipv6_getsockopt, |
1699 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
1700 | .sockaddr_len = sizeof(struct sockaddr_in6), |
1701 | .bind_conflict = inet6_csk_bind_conflict, |
1702 | #ifdef CONFIG_COMPAT |
1703 | .compat_setsockopt = compat_ipv6_setsockopt, |
1704 | .compat_getsockopt = compat_ipv6_getsockopt, |
1705 | #endif |
1706 | }; |
1707 | |
1708 | #ifdef CONFIG_TCP_MD5SIG |
1709 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
1710 | .md5_lookup = tcp_v4_md5_lookup, |
1711 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
1712 | .md5_parse = tcp_v6_parse_md5_keys, |
1713 | }; |
1714 | #endif |
1715 | |
1716 | /* NOTE: A lot of things set to zero explicitly by call to |
1717 | * sk_alloc() so need not be done here. |
1718 | */ |
1719 | static int tcp_v6_init_sock(struct sock *sk) |
1720 | { |
1721 | struct inet_connection_sock *icsk = inet_csk(sk); |
1722 | |
1723 | tcp_init_sock(sk); |
1724 | |
1725 | icsk->icsk_af_ops = &ipv6_specific; |
1726 | |
1727 | #ifdef CONFIG_TCP_MD5SIG |
1728 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
1729 | #endif |
1730 | |
1731 | return 0; |
1732 | } |
1733 | |
1734 | static void tcp_v6_destroy_sock(struct sock *sk) |
1735 | { |
1736 | tcp_v4_destroy_sock(sk); |
1737 | inet6_destroy_sock(sk); |
1738 | } |
1739 | |
1740 | #ifdef CONFIG_PROC_FS |
1741 | /* Proc filesystem TCPv6 sock list dumping. */ |
1742 | static void get_openreq6(struct seq_file *seq, |
1743 | const struct sock *sk, struct request_sock *req, int i, kuid_t uid) |
1744 | { |
1745 | int ttd = req->expires - jiffies; |
1746 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1747 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; |
1748 | |
1749 | if (ttd < 0) |
1750 | ttd = 0; |
1751 | |
1752 | seq_printf(seq, |
1753 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
1754 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1755 | i, |
1756 | src->s6_addr32[0], src->s6_addr32[1], |
1757 | src->s6_addr32[2], src->s6_addr32[3], |
1758 | inet_rsk(req)->ir_num, |
1759 | dest->s6_addr32[0], dest->s6_addr32[1], |
1760 | dest->s6_addr32[2], dest->s6_addr32[3], |
1761 | ntohs(inet_rsk(req)->ir_rmt_port), |
1762 | TCP_SYN_RECV, |
1763 | 0, 0, /* could print option size, but that is af dependent. */ |
1764 | 1, /* timers active (only the expire timer) */ |
1765 | jiffies_to_clock_t(ttd), |
1766 | req->num_timeout, |
1767 | from_kuid_munged(seq_user_ns(seq), uid), |
1768 | 0, /* non standard timer */ |
1769 | 0, /* open_requests have no inode */ |
1770 | 0, req); |
1771 | } |
1772 | |
1773 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) |
1774 | { |
1775 | const struct in6_addr *dest, *src; |
1776 | __u16 destp, srcp; |
1777 | int timer_active; |
1778 | unsigned long timer_expires; |
1779 | const struct inet_sock *inet = inet_sk(sp); |
1780 | const struct tcp_sock *tp = tcp_sk(sp); |
1781 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1782 | |
1783 | dest = &sp->sk_v6_daddr; |
1784 | src = &sp->sk_v6_rcv_saddr; |
1785 | destp = ntohs(inet->inet_dport); |
1786 | srcp = ntohs(inet->inet_sport); |
1787 | |
1788 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
1789 | timer_active = 1; |
1790 | timer_expires = icsk->icsk_timeout; |
1791 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
1792 | timer_active = 4; |
1793 | timer_expires = icsk->icsk_timeout; |
1794 | } else if (timer_pending(&sp->sk_timer)) { |
1795 | timer_active = 2; |
1796 | timer_expires = sp->sk_timer.expires; |
1797 | } else { |
1798 | timer_active = 0; |
1799 | timer_expires = jiffies; |
1800 | } |
1801 | |
1802 | seq_printf(seq, |
1803 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
1804 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1805 | i, |
1806 | src->s6_addr32[0], src->s6_addr32[1], |
1807 | src->s6_addr32[2], src->s6_addr32[3], srcp, |
1808 | dest->s6_addr32[0], dest->s6_addr32[1], |
1809 | dest->s6_addr32[2], dest->s6_addr32[3], destp, |
1810 | sp->sk_state, |
1811 | tp->write_seq-tp->snd_una, |
1812 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), |
1813 | timer_active, |
1814 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
1815 | icsk->icsk_retransmits, |
1816 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
1817 | icsk->icsk_probes_out, |
1818 | sock_i_ino(sp), |
1819 | atomic_read(&sp->sk_refcnt), sp, |
1820 | jiffies_to_clock_t(icsk->icsk_rto), |
1821 | jiffies_to_clock_t(icsk->icsk_ack.ato), |
1822 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
1823 | tp->snd_cwnd, |
1824 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh |
1825 | ); |
1826 | } |
1827 | |
1828 | static void get_timewait6_sock(struct seq_file *seq, |
1829 | struct inet_timewait_sock *tw, int i) |
1830 | { |
1831 | const struct in6_addr *dest, *src; |
1832 | __u16 destp, srcp; |
1833 | s32 delta = tw->tw_ttd - inet_tw_time_stamp(); |
1834 | |
1835 | dest = &tw->tw_v6_daddr; |
1836 | src = &tw->tw_v6_rcv_saddr; |
1837 | destp = ntohs(tw->tw_dport); |
1838 | srcp = ntohs(tw->tw_sport); |
1839 | |
1840 | seq_printf(seq, |
1841 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
1842 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1843 | i, |
1844 | src->s6_addr32[0], src->s6_addr32[1], |
1845 | src->s6_addr32[2], src->s6_addr32[3], srcp, |
1846 | dest->s6_addr32[0], dest->s6_addr32[1], |
1847 | dest->s6_addr32[2], dest->s6_addr32[3], destp, |
1848 | tw->tw_substate, 0, 0, |
1849 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
1850 | atomic_read(&tw->tw_refcnt), tw); |
1851 | } |
1852 | |
1853 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1854 | { |
1855 | struct tcp_iter_state *st; |
1856 | struct sock *sk = v; |
1857 | |
1858 | if (v == SEQ_START_TOKEN) { |
1859 | seq_puts(seq, |
1860 | " sl " |
1861 | "local_address " |
1862 | "remote_address " |
1863 | "st tx_queue rx_queue tr tm->when retrnsmt" |
1864 | " uid timeout inode\n"); |
1865 | goto out; |
1866 | } |
1867 | st = seq->private; |
1868 | |
1869 | switch (st->state) { |
1870 | case TCP_SEQ_STATE_LISTENING: |
1871 | case TCP_SEQ_STATE_ESTABLISHED: |
1872 | if (sk->sk_state == TCP_TIME_WAIT) |
1873 | get_timewait6_sock(seq, v, st->num); |
1874 | else |
1875 | get_tcp6_sock(seq, v, st->num); |
1876 | break; |
1877 | case TCP_SEQ_STATE_OPENREQ: |
1878 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); |
1879 | break; |
1880 | } |
1881 | out: |
1882 | return 0; |
1883 | } |
1884 | |
1885 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1886 | .owner = THIS_MODULE, |
1887 | .open = tcp_seq_open, |
1888 | .read = seq_read, |
1889 | .llseek = seq_lseek, |
1890 | .release = seq_release_net |
1891 | }; |
1892 | |
1893 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1894 | .name = "tcp6", |
1895 | .family = AF_INET6, |
1896 | .seq_fops = &tcp6_afinfo_seq_fops, |
1897 | .seq_ops = { |
1898 | .show = tcp6_seq_show, |
1899 | }, |
1900 | }; |
1901 | |
1902 | int __net_init tcp6_proc_init(struct net *net) |
1903 | { |
1904 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1905 | } |
1906 | |
1907 | void tcp6_proc_exit(struct net *net) |
1908 | { |
1909 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1910 | } |
1911 | #endif |
1912 | |
1913 | static void tcp_v6_clear_sk(struct sock *sk, int size) |
1914 | { |
1915 | struct inet_sock *inet = inet_sk(sk); |
1916 | |
1917 | /* we do not want to clear pinet6 field, because of RCU lookups */ |
1918 | sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6)); |
1919 | |
1920 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); |
1921 | memset(&inet->pinet6 + 1, 0, size); |
1922 | } |
1923 | |
1924 | struct proto tcpv6_prot = { |
1925 | .name = "TCPv6", |
1926 | .owner = THIS_MODULE, |
1927 | .close = tcp_close, |
1928 | .connect = tcp_v6_connect, |
1929 | .disconnect = tcp_disconnect, |
1930 | .accept = inet_csk_accept, |
1931 | .ioctl = tcp_ioctl, |
1932 | .init = tcp_v6_init_sock, |
1933 | .destroy = tcp_v6_destroy_sock, |
1934 | .shutdown = tcp_shutdown, |
1935 | .setsockopt = tcp_setsockopt, |
1936 | .getsockopt = tcp_getsockopt, |
1937 | .recvmsg = tcp_recvmsg, |
1938 | .sendmsg = tcp_sendmsg, |
1939 | .sendpage = tcp_sendpage, |
1940 | .backlog_rcv = tcp_v6_do_rcv, |
1941 | .release_cb = tcp_release_cb, |
1942 | .mtu_reduced = tcp_v6_mtu_reduced, |
1943 | .hash = tcp_v6_hash, |
1944 | .unhash = inet_unhash, |
1945 | .get_port = inet_csk_get_port, |
1946 | .enter_memory_pressure = tcp_enter_memory_pressure, |
1947 | .stream_memory_free = tcp_stream_memory_free, |
1948 | .sockets_allocated = &tcp_sockets_allocated, |
1949 | .memory_allocated = &tcp_memory_allocated, |
1950 | .memory_pressure = &tcp_memory_pressure, |
1951 | .orphan_count = &tcp_orphan_count, |
1952 | .sysctl_mem = sysctl_tcp_mem, |
1953 | .sysctl_wmem = sysctl_tcp_wmem, |
1954 | .sysctl_rmem = sysctl_tcp_rmem, |
1955 | .max_header = MAX_TCP_HEADER, |
1956 | .obj_size = sizeof(struct tcp6_sock), |
1957 | .slab_flags = SLAB_DESTROY_BY_RCU, |
1958 | .twsk_prot = &tcp6_timewait_sock_ops, |
1959 | .rsk_prot = &tcp6_request_sock_ops, |
1960 | .h.hashinfo = &tcp_hashinfo, |
1961 | .no_autobind = true, |
1962 | #ifdef CONFIG_COMPAT |
1963 | .compat_setsockopt = compat_tcp_setsockopt, |
1964 | .compat_getsockopt = compat_tcp_getsockopt, |
1965 | #endif |
1966 | #ifdef CONFIG_MEMCG_KMEM |
1967 | .proto_cgroup = tcp_proto_cgroup, |
1968 | #endif |
1969 | .clear_sk = tcp_v6_clear_sk, |
1970 | }; |
1971 | |
1972 | static const struct inet6_protocol tcpv6_protocol = { |
1973 | .early_demux = tcp_v6_early_demux, |
1974 | .handler = tcp_v6_rcv, |
1975 | .err_handler = tcp_v6_err, |
1976 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
1977 | }; |
1978 | |
1979 | static struct inet_protosw tcpv6_protosw = { |
1980 | .type = SOCK_STREAM, |
1981 | .protocol = IPPROTO_TCP, |
1982 | .prot = &tcpv6_prot, |
1983 | .ops = &inet6_stream_ops, |
1984 | .no_check = 0, |
1985 | .flags = INET_PROTOSW_PERMANENT | |
1986 | INET_PROTOSW_ICSK, |
1987 | }; |
1988 | |
1989 | static int __net_init tcpv6_net_init(struct net *net) |
1990 | { |
1991 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
1992 | SOCK_RAW, IPPROTO_TCP, net); |
1993 | } |
1994 | |
1995 | static void __net_exit tcpv6_net_exit(struct net *net) |
1996 | { |
1997 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
1998 | } |
1999 | |
2000 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
2001 | { |
2002 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); |
2003 | } |
2004 | |
2005 | static struct pernet_operations tcpv6_net_ops = { |
2006 | .init = tcpv6_net_init, |
2007 | .exit = tcpv6_net_exit, |
2008 | .exit_batch = tcpv6_net_exit_batch, |
2009 | }; |
2010 | |
2011 | int __init tcpv6_init(void) |
2012 | { |
2013 | int ret; |
2014 | |
2015 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
2016 | if (ret) |
2017 | goto out; |
2018 | |
2019 | /* register inet6 protocol */ |
2020 | ret = inet6_register_protosw(&tcpv6_protosw); |
2021 | if (ret) |
2022 | goto out_tcpv6_protocol; |
2023 | |
2024 | ret = register_pernet_subsys(&tcpv6_net_ops); |
2025 | if (ret) |
2026 | goto out_tcpv6_protosw; |
2027 | out: |
2028 | return ret; |
2029 | |
2030 | out_tcpv6_protosw: |
2031 | inet6_unregister_protosw(&tcpv6_protosw); |
2032 | out_tcpv6_protocol: |
2033 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); |
2034 | goto out; |
2035 | } |
2036 | |
2037 | void tcpv6_exit(void) |
2038 | { |
2039 | unregister_pernet_subsys(&tcpv6_net_ops); |
2040 | inet6_unregister_protosw(&tcpv6_protosw); |
2041 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); |
2042 | } |
2043 |
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