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 | 7 | * |
1ab1457c | 8 | * Based on: |
1da177e4 LT |
9 | * linux/net/ipv4/tcp.c |
10 | * linux/net/ipv4/tcp_input.c | |
11 | * linux/net/ipv4/tcp_output.c | |
12 | * | |
13 | * Fixes: | |
14 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
15 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
16 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
17 | * a single port at the same time. | |
18 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file. | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or | |
21 | * modify it under the terms of the GNU General Public License | |
22 | * as published by the Free Software Foundation; either version | |
23 | * 2 of the License, or (at your option) any later version. | |
24 | */ | |
25 | ||
eb4dea58 | 26 | #include <linux/bottom_half.h> |
1da177e4 | 27 | #include <linux/module.h> |
1da177e4 LT |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/socket.h> | |
31 | #include <linux/sockios.h> | |
32 | #include <linux/net.h> | |
33 | #include <linux/jiffies.h> | |
34 | #include <linux/in.h> | |
35 | #include <linux/in6.h> | |
36 | #include <linux/netdevice.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/jhash.h> | |
39 | #include <linux/ipsec.h> | |
40 | #include <linux/times.h> | |
5a0e3ad6 | 41 | #include <linux/slab.h> |
1da177e4 LT |
42 | |
43 | #include <linux/ipv6.h> | |
44 | #include <linux/icmpv6.h> | |
45 | #include <linux/random.h> | |
46 | ||
47 | #include <net/tcp.h> | |
48 | #include <net/ndisc.h> | |
5324a040 | 49 | #include <net/inet6_hashtables.h> |
8129765a | 50 | #include <net/inet6_connection_sock.h> |
1da177e4 LT |
51 | #include <net/ipv6.h> |
52 | #include <net/transp_v6.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/ip6_route.h> | |
55 | #include <net/ip6_checksum.h> | |
56 | #include <net/inet_ecn.h> | |
57 | #include <net/protocol.h> | |
58 | #include <net/xfrm.h> | |
1da177e4 LT |
59 | #include <net/snmp.h> |
60 | #include <net/dsfield.h> | |
6d6ee43e | 61 | #include <net/timewait_sock.h> |
18134bed | 62 | #include <net/netdma.h> |
3d58b5fa | 63 | #include <net/inet_common.h> |
6e5714ea | 64 | #include <net/secure_seq.h> |
d1a4c0b3 | 65 | #include <net/tcp_memcontrol.h> |
076bb0c8 | 66 | #include <net/busy_poll.h> |
1da177e4 LT |
67 | |
68 | #include <asm/uaccess.h> | |
69 | ||
70 | #include <linux/proc_fs.h> | |
71 | #include <linux/seq_file.h> | |
72 | ||
cfb6eeb4 YH |
73 | #include <linux/crypto.h> |
74 | #include <linux/scatterlist.h> | |
75 | ||
cfb6eeb4 | 76 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
6edafaaf GJ |
77 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
78 | struct request_sock *req); | |
1da177e4 LT |
79 | |
80 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 81 | |
3b401a81 SH |
82 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
83 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 84 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
85 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
86 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
87 | #else |
88 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 89 | const struct in6_addr *addr) |
9501f972 YH |
90 | { |
91 | return NULL; | |
92 | } | |
a928630a | 93 | #endif |
1da177e4 | 94 | |
fae6ef87 NC |
95 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
96 | { | |
97 | struct dst_entry *dst = skb_dst(skb); | |
98 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
99 | ||
100 | dst_hold(dst); | |
101 | sk->sk_rx_dst = dst; | |
102 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
103 | if (rt->rt6i_node) | |
104 | inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum; | |
105 | } | |
106 | ||
1da177e4 LT |
107 | static void tcp_v6_hash(struct sock *sk) |
108 | { | |
109 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 110 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
111 | tcp_prot.hash(sk); |
112 | return; | |
113 | } | |
114 | local_bh_disable(); | |
9327f705 | 115 | __inet6_hash(sk, NULL); |
1da177e4 LT |
116 | local_bh_enable(); |
117 | } | |
118 | } | |
119 | ||
cf533ea5 | 120 | static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) |
1da177e4 | 121 | { |
0660e03f ACM |
122 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
123 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
124 | tcp_hdr(skb)->dest, |
125 | tcp_hdr(skb)->source); | |
1da177e4 LT |
126 | } |
127 | ||
1ab1457c | 128 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
129 | int addr_len) |
130 | { | |
131 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 132 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 133 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
134 | struct ipv6_pinfo *np = inet6_sk(sk); |
135 | struct tcp_sock *tp = tcp_sk(sk); | |
20c59de2 | 136 | struct in6_addr *saddr = NULL, *final_p, final; |
493f377d | 137 | struct rt6_info *rt; |
4c9483b2 | 138 | struct flowi6 fl6; |
1da177e4 LT |
139 | struct dst_entry *dst; |
140 | int addr_type; | |
141 | int err; | |
142 | ||
1ab1457c | 143 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
144 | return -EINVAL; |
145 | ||
1ab1457c | 146 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 147 | return -EAFNOSUPPORT; |
1da177e4 | 148 | |
4c9483b2 | 149 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
150 | |
151 | if (np->sndflow) { | |
4c9483b2 DM |
152 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
153 | IP6_ECN_flow_init(fl6.flowlabel); | |
154 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 155 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 156 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
1da177e4 LT |
157 | if (flowlabel == NULL) |
158 | return -EINVAL; | |
1da177e4 LT |
159 | fl6_sock_release(flowlabel); |
160 | } | |
161 | } | |
162 | ||
163 | /* | |
1ab1457c YH |
164 | * connect() to INADDR_ANY means loopback (BSD'ism). |
165 | */ | |
166 | ||
167 | if(ipv6_addr_any(&usin->sin6_addr)) | |
168 | usin->sin6_addr.s6_addr[15] = 0x1; | |
1da177e4 LT |
169 | |
170 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
171 | ||
172 | if(addr_type & IPV6_ADDR_MULTICAST) | |
173 | return -ENETUNREACH; | |
174 | ||
175 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
176 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
177 | usin->sin6_scope_id) { | |
178 | /* If interface is set while binding, indices | |
179 | * must coincide. | |
180 | */ | |
181 | if (sk->sk_bound_dev_if && | |
182 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
183 | return -EINVAL; | |
184 | ||
185 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
186 | } | |
187 | ||
188 | /* Connect to link-local address requires an interface */ | |
189 | if (!sk->sk_bound_dev_if) | |
190 | return -EINVAL; | |
191 | } | |
192 | ||
193 | if (tp->rx_opt.ts_recent_stamp && | |
efe4208f | 194 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
1da177e4 LT |
195 | tp->rx_opt.ts_recent = 0; |
196 | tp->rx_opt.ts_recent_stamp = 0; | |
197 | tp->write_seq = 0; | |
198 | } | |
199 | ||
efe4208f | 200 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 201 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
202 | |
203 | /* | |
204 | * TCP over IPv4 | |
205 | */ | |
206 | ||
207 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 208 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
209 | struct sockaddr_in sin; |
210 | ||
211 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
212 | ||
213 | if (__ipv6_only_sock(sk)) | |
214 | return -ENETUNREACH; | |
215 | ||
216 | sin.sin_family = AF_INET; | |
217 | sin.sin_port = usin->sin6_port; | |
218 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
219 | ||
d83d8461 | 220 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 221 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
222 | #ifdef CONFIG_TCP_MD5SIG |
223 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
224 | #endif | |
1da177e4 LT |
225 | |
226 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
227 | ||
228 | if (err) { | |
d83d8461 ACM |
229 | icsk->icsk_ext_hdr_len = exthdrlen; |
230 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 231 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
232 | #ifdef CONFIG_TCP_MD5SIG |
233 | tp->af_specific = &tcp_sock_ipv6_specific; | |
234 | #endif | |
1da177e4 LT |
235 | goto failure; |
236 | } else { | |
c720c7e8 ED |
237 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
238 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, | |
efe4208f | 239 | &sk->sk_v6_rcv_saddr); |
1da177e4 LT |
240 | } |
241 | ||
242 | return err; | |
243 | } | |
244 | ||
efe4208f ED |
245 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
246 | saddr = &sk->sk_v6_rcv_saddr; | |
1da177e4 | 247 | |
4c9483b2 | 248 | fl6.flowi6_proto = IPPROTO_TCP; |
efe4208f | 249 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 250 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 DM |
251 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
252 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
253 | fl6.fl6_dport = usin->sin6_port; |
254 | fl6.fl6_sport = inet->inet_sport; | |
1da177e4 | 255 | |
4c9483b2 | 256 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
1da177e4 | 257 | |
4c9483b2 | 258 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 259 | |
0e0d44ab | 260 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
261 | if (IS_ERR(dst)) { |
262 | err = PTR_ERR(dst); | |
1da177e4 | 263 | goto failure; |
14e50e57 | 264 | } |
1da177e4 LT |
265 | |
266 | if (saddr == NULL) { | |
4c9483b2 | 267 | saddr = &fl6.saddr; |
efe4208f | 268 | sk->sk_v6_rcv_saddr = *saddr; |
1da177e4 LT |
269 | } |
270 | ||
271 | /* set the source address */ | |
4e3fd7a0 | 272 | np->saddr = *saddr; |
c720c7e8 | 273 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 274 | |
f83ef8c0 | 275 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 276 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 277 | |
493f377d DM |
278 | rt = (struct rt6_info *) dst; |
279 | if (tcp_death_row.sysctl_tw_recycle && | |
280 | !tp->rx_opt.ts_recent_stamp && | |
efe4208f | 281 | ipv6_addr_equal(&rt->rt6i_dst.addr, &sk->sk_v6_daddr)) |
81166dd6 | 282 | tcp_fetch_timewait_stamp(sk, dst); |
493f377d | 283 | |
d83d8461 | 284 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 285 | if (np->opt) |
d83d8461 ACM |
286 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
287 | np->opt->opt_nflen); | |
1da177e4 LT |
288 | |
289 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
290 | ||
c720c7e8 | 291 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
292 | |
293 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 294 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
295 | if (err) |
296 | goto late_failure; | |
297 | ||
2b916477 | 298 | if (!tp->write_seq && likely(!tp->repair)) |
1da177e4 | 299 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
efe4208f | 300 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
301 | inet->inet_sport, |
302 | inet->inet_dport); | |
1da177e4 LT |
303 | |
304 | err = tcp_connect(sk); | |
305 | if (err) | |
306 | goto late_failure; | |
307 | ||
308 | return 0; | |
309 | ||
310 | late_failure: | |
311 | tcp_set_state(sk, TCP_CLOSE); | |
312 | __sk_dst_reset(sk); | |
313 | failure: | |
c720c7e8 | 314 | inet->inet_dport = 0; |
1da177e4 LT |
315 | sk->sk_route_caps = 0; |
316 | return err; | |
317 | } | |
318 | ||
563d34d0 ED |
319 | static void tcp_v6_mtu_reduced(struct sock *sk) |
320 | { | |
321 | struct dst_entry *dst; | |
322 | ||
323 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
324 | return; | |
325 | ||
326 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
327 | if (!dst) | |
328 | return; | |
329 | ||
330 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
331 | tcp_sync_mss(sk, dst_mtu(dst)); | |
332 | tcp_simple_retransmit(sk); | |
333 | } | |
334 | } | |
335 | ||
1da177e4 | 336 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 337 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 338 | { |
b71d1d42 | 339 | const struct ipv6hdr *hdr = (const struct ipv6hdr*)skb->data; |
505cbfc5 | 340 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
341 | struct ipv6_pinfo *np; |
342 | struct sock *sk; | |
343 | int err; | |
1ab1457c | 344 | struct tcp_sock *tp; |
1da177e4 | 345 | __u32 seq; |
ca12a1a4 | 346 | struct net *net = dev_net(skb->dev); |
1da177e4 | 347 | |
ca12a1a4 | 348 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 349 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
350 | |
351 | if (sk == NULL) { | |
e41b5368 DL |
352 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
353 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
354 | return; |
355 | } | |
356 | ||
357 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 358 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
359 | return; |
360 | } | |
361 | ||
362 | bh_lock_sock(sk); | |
563d34d0 | 363 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
de0744af | 364 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
365 | |
366 | if (sk->sk_state == TCP_CLOSE) | |
367 | goto out; | |
368 | ||
e802af9c SH |
369 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
370 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
371 | goto out; | |
372 | } | |
373 | ||
1da177e4 | 374 | tp = tcp_sk(sk); |
1ab1457c | 375 | seq = ntohl(th->seq); |
1da177e4 LT |
376 | if (sk->sk_state != TCP_LISTEN && |
377 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
de0744af | 378 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
379 | goto out; |
380 | } | |
381 | ||
382 | np = inet6_sk(sk); | |
383 | ||
ec18d9a2 DM |
384 | if (type == NDISC_REDIRECT) { |
385 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
386 | ||
1ed5c48f | 387 | if (dst) |
6700c270 | 388 | dst->ops->redirect(dst, sk, skb); |
50a75a89 | 389 | goto out; |
ec18d9a2 DM |
390 | } |
391 | ||
1da177e4 | 392 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
393 | /* We are not interested in TCP_LISTEN and open_requests |
394 | * (SYN-ACKs send out by Linux are always <576bytes so | |
395 | * they should go through unfragmented). | |
396 | */ | |
397 | if (sk->sk_state == TCP_LISTEN) | |
398 | goto out; | |
399 | ||
93b36cf3 HFS |
400 | if (!ip6_sk_accept_pmtu(sk)) |
401 | goto out; | |
402 | ||
563d34d0 ED |
403 | tp->mtu_info = ntohl(info); |
404 | if (!sock_owned_by_user(sk)) | |
405 | tcp_v6_mtu_reduced(sk); | |
d013ef2a JA |
406 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
407 | &tp->tsq_flags)) | |
408 | sock_hold(sk); | |
1da177e4 LT |
409 | goto out; |
410 | } | |
411 | ||
412 | icmpv6_err_convert(type, code, &err); | |
413 | ||
60236fdd | 414 | /* Might be for an request_sock */ |
1da177e4 | 415 | switch (sk->sk_state) { |
60236fdd | 416 | struct request_sock *req, **prev; |
1da177e4 LT |
417 | case TCP_LISTEN: |
418 | if (sock_owned_by_user(sk)) | |
419 | goto out; | |
420 | ||
8129765a ACM |
421 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
422 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
423 | if (!req) |
424 | goto out; | |
425 | ||
426 | /* ICMPs are not backlogged, hence we cannot get | |
427 | * an established socket here. | |
428 | */ | |
547b792c | 429 | WARN_ON(req->sk != NULL); |
1da177e4 | 430 | |
2e6599cb | 431 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 432 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
433 | goto out; |
434 | } | |
435 | ||
463c84b9 | 436 | inet_csk_reqsk_queue_drop(sk, req, prev); |
5f1e942c | 437 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
438 | goto out; |
439 | ||
440 | case TCP_SYN_SENT: | |
441 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 442 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 443 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
444 | sk->sk_err = err; |
445 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
446 | ||
447 | tcp_done(sk); | |
448 | } else | |
449 | sk->sk_err_soft = err; | |
450 | goto out; | |
451 | } | |
452 | ||
453 | if (!sock_owned_by_user(sk) && np->recverr) { | |
454 | sk->sk_err = err; | |
455 | sk->sk_error_report(sk); | |
456 | } else | |
457 | sk->sk_err_soft = err; | |
458 | ||
459 | out: | |
460 | bh_unlock_sock(sk); | |
461 | sock_put(sk); | |
462 | } | |
463 | ||
464 | ||
9f10d3f6 NC |
465 | static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst, |
466 | struct flowi6 *fl6, | |
3840a06e | 467 | struct request_sock *req, |
fff32699 | 468 | u16 queue_mapping) |
1da177e4 | 469 | { |
634fb979 | 470 | struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 LT |
471 | struct ipv6_pinfo *np = inet6_sk(sk); |
472 | struct sk_buff * skb; | |
9494218f | 473 | int err = -ENOMEM; |
1da177e4 | 474 | |
9f10d3f6 NC |
475 | /* First, grab a route. */ |
476 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL) | |
fd80eb94 | 477 | goto done; |
9494218f | 478 | |
1a2c6181 | 479 | skb = tcp_make_synack(sk, dst, req, NULL); |
9494218f | 480 | |
1da177e4 | 481 | if (skb) { |
634fb979 ED |
482 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
483 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 484 | |
634fb979 | 485 | fl6->daddr = ireq->ir_v6_rmt_addr; |
fff32699 | 486 | skb_set_queue_mapping(skb, queue_mapping); |
43264e0b | 487 | err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass); |
b9df3cb8 | 488 | err = net_xmit_eval(err); |
1da177e4 LT |
489 | } |
490 | ||
491 | done: | |
1da177e4 LT |
492 | return err; |
493 | } | |
494 | ||
1a2c6181 | 495 | static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req) |
72659ecc | 496 | { |
9f10d3f6 | 497 | struct flowi6 fl6; |
e6c022a4 | 498 | int res; |
9f10d3f6 | 499 | |
1a2c6181 | 500 | res = tcp_v6_send_synack(sk, NULL, &fl6, req, 0); |
e6c022a4 ED |
501 | if (!res) |
502 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); | |
503 | return res; | |
72659ecc OP |
504 | } |
505 | ||
60236fdd | 506 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 507 | { |
634fb979 | 508 | kfree_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
509 | } |
510 | ||
cfb6eeb4 YH |
511 | #ifdef CONFIG_TCP_MD5SIG |
512 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 513 | const struct in6_addr *addr) |
cfb6eeb4 | 514 | { |
a915da9b | 515 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
516 | } |
517 | ||
518 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
519 | struct sock *addr_sk) | |
520 | { | |
efe4208f | 521 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
cfb6eeb4 YH |
522 | } |
523 | ||
524 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
525 | struct request_sock *req) | |
526 | { | |
634fb979 | 527 | return tcp_v6_md5_do_lookup(sk, &inet_rsk(req)->ir_v6_rmt_addr); |
cfb6eeb4 YH |
528 | } |
529 | ||
cfb6eeb4 YH |
530 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, |
531 | int optlen) | |
532 | { | |
533 | struct tcp_md5sig cmd; | |
534 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
535 | |
536 | if (optlen < sizeof(cmd)) | |
537 | return -EINVAL; | |
538 | ||
539 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
540 | return -EFAULT; | |
541 | ||
542 | if (sin6->sin6_family != AF_INET6) | |
543 | return -EINVAL; | |
544 | ||
545 | if (!cmd.tcpm_keylen) { | |
e773e4fa | 546 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b ED |
547 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
548 | AF_INET); | |
549 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, | |
550 | AF_INET6); | |
cfb6eeb4 YH |
551 | } |
552 | ||
553 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
554 | return -EINVAL; | |
555 | ||
a915da9b ED |
556 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
557 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
558 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 | 559 | |
a915da9b ED |
560 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
561 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
562 | } |
563 | ||
49a72dfb | 564 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
b71d1d42 ED |
565 | const struct in6_addr *daddr, |
566 | const struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 567 | { |
cfb6eeb4 | 568 | struct tcp6_pseudohdr *bp; |
49a72dfb | 569 | struct scatterlist sg; |
8d26d76d | 570 | |
cfb6eeb4 | 571 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 | 572 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
573 | bp->saddr = *saddr; |
574 | bp->daddr = *daddr; | |
49a72dfb | 575 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 576 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 577 | |
49a72dfb AL |
578 | sg_init_one(&sg, bp, sizeof(*bp)); |
579 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
580 | } | |
c7da57a1 | 581 | |
49a72dfb | 582 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
b71d1d42 | 583 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 584 | const struct tcphdr *th) |
49a72dfb AL |
585 | { |
586 | struct tcp_md5sig_pool *hp; | |
587 | struct hash_desc *desc; | |
588 | ||
589 | hp = tcp_get_md5sig_pool(); | |
590 | if (!hp) | |
591 | goto clear_hash_noput; | |
592 | desc = &hp->md5_desc; | |
593 | ||
594 | if (crypto_hash_init(desc)) | |
595 | goto clear_hash; | |
596 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
597 | goto clear_hash; | |
598 | if (tcp_md5_hash_header(hp, th)) | |
599 | goto clear_hash; | |
600 | if (tcp_md5_hash_key(hp, key)) | |
601 | goto clear_hash; | |
602 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 603 | goto clear_hash; |
cfb6eeb4 | 604 | |
cfb6eeb4 | 605 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 606 | return 0; |
49a72dfb | 607 | |
cfb6eeb4 YH |
608 | clear_hash: |
609 | tcp_put_md5sig_pool(); | |
610 | clear_hash_noput: | |
611 | memset(md5_hash, 0, 16); | |
49a72dfb | 612 | return 1; |
cfb6eeb4 YH |
613 | } |
614 | ||
49a72dfb | 615 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
318cf7aa ED |
616 | const struct sock *sk, |
617 | const struct request_sock *req, | |
618 | const struct sk_buff *skb) | |
cfb6eeb4 | 619 | { |
b71d1d42 | 620 | const struct in6_addr *saddr, *daddr; |
49a72dfb AL |
621 | struct tcp_md5sig_pool *hp; |
622 | struct hash_desc *desc; | |
318cf7aa | 623 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
624 | |
625 | if (sk) { | |
626 | saddr = &inet6_sk(sk)->saddr; | |
efe4208f | 627 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 628 | } else if (req) { |
634fb979 ED |
629 | saddr = &inet_rsk(req)->ir_v6_loc_addr; |
630 | daddr = &inet_rsk(req)->ir_v6_rmt_addr; | |
49a72dfb | 631 | } else { |
b71d1d42 | 632 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
633 | saddr = &ip6h->saddr; |
634 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 635 | } |
49a72dfb AL |
636 | |
637 | hp = tcp_get_md5sig_pool(); | |
638 | if (!hp) | |
639 | goto clear_hash_noput; | |
640 | desc = &hp->md5_desc; | |
641 | ||
642 | if (crypto_hash_init(desc)) | |
643 | goto clear_hash; | |
644 | ||
645 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
646 | goto clear_hash; | |
647 | if (tcp_md5_hash_header(hp, th)) | |
648 | goto clear_hash; | |
649 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
650 | goto clear_hash; | |
651 | if (tcp_md5_hash_key(hp, key)) | |
652 | goto clear_hash; | |
653 | if (crypto_hash_final(desc, md5_hash)) | |
654 | goto clear_hash; | |
655 | ||
656 | tcp_put_md5sig_pool(); | |
657 | return 0; | |
658 | ||
659 | clear_hash: | |
660 | tcp_put_md5sig_pool(); | |
661 | clear_hash_noput: | |
662 | memset(md5_hash, 0, 16); | |
663 | return 1; | |
cfb6eeb4 YH |
664 | } |
665 | ||
318cf7aa | 666 | static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
cfb6eeb4 | 667 | { |
cf533ea5 | 668 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 669 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 670 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 671 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 672 | int genhash; |
cfb6eeb4 YH |
673 | u8 newhash[16]; |
674 | ||
675 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 676 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 677 | |
785957d3 DM |
678 | /* We've parsed the options - do we have a hash? */ |
679 | if (!hash_expected && !hash_location) | |
680 | return 0; | |
681 | ||
682 | if (hash_expected && !hash_location) { | |
683 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
684 | return 1; |
685 | } | |
686 | ||
785957d3 DM |
687 | if (!hash_expected && hash_location) { |
688 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
689 | return 1; |
690 | } | |
691 | ||
692 | /* check the signature */ | |
49a72dfb AL |
693 | genhash = tcp_v6_md5_hash_skb(newhash, |
694 | hash_expected, | |
695 | NULL, NULL, skb); | |
696 | ||
cfb6eeb4 | 697 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
e87cc472 JP |
698 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
699 | genhash ? "failed" : "mismatch", | |
700 | &ip6h->saddr, ntohs(th->source), | |
701 | &ip6h->daddr, ntohs(th->dest)); | |
cfb6eeb4 YH |
702 | return 1; |
703 | } | |
704 | return 0; | |
705 | } | |
706 | #endif | |
707 | ||
c6aefafb | 708 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 709 | .family = AF_INET6, |
2e6599cb | 710 | .obj_size = sizeof(struct tcp6_request_sock), |
72659ecc | 711 | .rtx_syn_ack = tcp_v6_rtx_synack, |
60236fdd ACM |
712 | .send_ack = tcp_v6_reqsk_send_ack, |
713 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc OP |
714 | .send_reset = tcp_v6_send_reset, |
715 | .syn_ack_timeout = tcp_syn_ack_timeout, | |
1da177e4 LT |
716 | }; |
717 | ||
cfb6eeb4 | 718 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 719 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 720 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 721 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 722 | }; |
b6332e6c | 723 | #endif |
cfb6eeb4 | 724 | |
626e264d | 725 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
ee684b6f AV |
726 | u32 tsval, u32 tsecr, |
727 | struct tcp_md5sig_key *key, int rst, u8 tclass) | |
1da177e4 | 728 | { |
cf533ea5 ED |
729 | const struct tcphdr *th = tcp_hdr(skb); |
730 | struct tcphdr *t1; | |
1da177e4 | 731 | struct sk_buff *buff; |
4c9483b2 | 732 | struct flowi6 fl6; |
adf30907 | 733 | struct net *net = dev_net(skb_dst(skb)->dev); |
e5047992 | 734 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 735 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 736 | struct dst_entry *dst; |
81ada62d | 737 | __be32 *topt; |
1da177e4 | 738 | |
ee684b6f | 739 | if (tsecr) |
626e264d | 740 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 741 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
742 | if (key) |
743 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
744 | #endif | |
745 | ||
cfb6eeb4 | 746 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 747 | GFP_ATOMIC); |
1ab1457c YH |
748 | if (buff == NULL) |
749 | return; | |
1da177e4 | 750 | |
cfb6eeb4 | 751 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 752 | |
cfb6eeb4 | 753 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 754 | skb_reset_transport_header(buff); |
1da177e4 LT |
755 | |
756 | /* Swap the send and the receive. */ | |
757 | memset(t1, 0, sizeof(*t1)); | |
758 | t1->dest = th->source; | |
759 | t1->source = th->dest; | |
cfb6eeb4 | 760 | t1->doff = tot_len / 4; |
626e264d IJ |
761 | t1->seq = htonl(seq); |
762 | t1->ack_seq = htonl(ack); | |
763 | t1->ack = !rst || !th->ack; | |
764 | t1->rst = rst; | |
765 | t1->window = htons(win); | |
1da177e4 | 766 | |
81ada62d IJ |
767 | topt = (__be32 *)(t1 + 1); |
768 | ||
ee684b6f | 769 | if (tsecr) { |
626e264d IJ |
770 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
771 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
772 | *topt++ = htonl(tsval); |
773 | *topt++ = htonl(tsecr); | |
626e264d IJ |
774 | } |
775 | ||
cfb6eeb4 YH |
776 | #ifdef CONFIG_TCP_MD5SIG |
777 | if (key) { | |
81ada62d IJ |
778 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
779 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
780 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
781 | &ipv6_hdr(skb)->saddr, |
782 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
783 | } |
784 | #endif | |
785 | ||
4c9483b2 | 786 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
787 | fl6.daddr = ipv6_hdr(skb)->saddr; |
788 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1da177e4 | 789 | |
e5700aff DM |
790 | buff->ip_summed = CHECKSUM_PARTIAL; |
791 | buff->csum = 0; | |
792 | ||
4c9483b2 | 793 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 794 | |
4c9483b2 | 795 | fl6.flowi6_proto = IPPROTO_TCP; |
4c675258 AK |
796 | if (ipv6_addr_type(&fl6.daddr) & IPV6_ADDR_LINKLOCAL) |
797 | fl6.flowi6_oif = inet6_iif(skb); | |
1958b856 DM |
798 | fl6.fl6_dport = t1->dest; |
799 | fl6.fl6_sport = t1->source; | |
4c9483b2 | 800 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 801 | |
c20121ae DL |
802 | /* Pass a socket to ip6_dst_lookup either it is for RST |
803 | * Underlying function will use this to retrieve the network | |
804 | * namespace | |
805 | */ | |
0e0d44ab | 806 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
807 | if (!IS_ERR(dst)) { |
808 | skb_dst_set(buff, dst); | |
b903d324 | 809 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
68d0c6d3 DM |
810 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
811 | if (rst) | |
812 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
813 | return; | |
1da177e4 LT |
814 | } |
815 | ||
816 | kfree_skb(buff); | |
817 | } | |
818 | ||
626e264d | 819 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 820 | { |
cf533ea5 | 821 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 822 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 823 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
824 | #ifdef CONFIG_TCP_MD5SIG |
825 | const __u8 *hash_location = NULL; | |
826 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
827 | unsigned char newhash[16]; | |
828 | int genhash; | |
829 | struct sock *sk1 = NULL; | |
830 | #endif | |
1da177e4 | 831 | |
626e264d | 832 | if (th->rst) |
1da177e4 LT |
833 | return; |
834 | ||
626e264d IJ |
835 | if (!ipv6_unicast_destination(skb)) |
836 | return; | |
1da177e4 | 837 | |
cfb6eeb4 | 838 | #ifdef CONFIG_TCP_MD5SIG |
658ddaaf SL |
839 | hash_location = tcp_parse_md5sig_option(th); |
840 | if (!sk && hash_location) { | |
841 | /* | |
842 | * active side is lost. Try to find listening socket through | |
843 | * source port, and then find md5 key through listening socket. | |
844 | * we are not loose security here: | |
845 | * Incoming packet is checked with md5 hash with finding key, | |
846 | * no RST generated if md5 hash doesn't match. | |
847 | */ | |
848 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
5ba24953 TH |
849 | &tcp_hashinfo, &ipv6h->saddr, |
850 | th->source, &ipv6h->daddr, | |
658ddaaf SL |
851 | ntohs(th->source), inet6_iif(skb)); |
852 | if (!sk1) | |
853 | return; | |
854 | ||
855 | rcu_read_lock(); | |
856 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); | |
857 | if (!key) | |
858 | goto release_sk1; | |
859 | ||
860 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb); | |
861 | if (genhash || memcmp(hash_location, newhash, 16) != 0) | |
862 | goto release_sk1; | |
863 | } else { | |
864 | key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; | |
865 | } | |
cfb6eeb4 YH |
866 | #endif |
867 | ||
626e264d IJ |
868 | if (th->ack) |
869 | seq = ntohl(th->ack_seq); | |
870 | else | |
871 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
872 | (th->doff << 2); | |
1da177e4 | 873 | |
ee684b6f | 874 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, 0, key, 1, 0); |
658ddaaf SL |
875 | |
876 | #ifdef CONFIG_TCP_MD5SIG | |
877 | release_sk1: | |
878 | if (sk1) { | |
879 | rcu_read_unlock(); | |
880 | sock_put(sk1); | |
881 | } | |
882 | #endif | |
626e264d | 883 | } |
1da177e4 | 884 | |
ee684b6f AV |
885 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, |
886 | u32 win, u32 tsval, u32 tsecr, | |
b903d324 | 887 | struct tcp_md5sig_key *key, u8 tclass) |
626e264d | 888 | { |
ee684b6f | 889 | tcp_v6_send_response(skb, seq, ack, win, tsval, tsecr, key, 0, tclass); |
1da177e4 LT |
890 | } |
891 | ||
892 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
893 | { | |
8feaf0c0 | 894 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 895 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 896 | |
9501f972 | 897 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 898 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
ee684b6f | 899 | tcp_time_stamp + tcptw->tw_ts_offset, |
b903d324 ED |
900 | tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw), |
901 | tw->tw_tclass); | |
1da177e4 | 902 | |
8feaf0c0 | 903 | inet_twsk_put(tw); |
1da177e4 LT |
904 | } |
905 | ||
6edafaaf GJ |
906 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
907 | struct request_sock *req) | |
1da177e4 | 908 | { |
ee684b6f AV |
909 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, |
910 | req->rcv_wnd, tcp_time_stamp, req->ts_recent, | |
b903d324 | 911 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), 0); |
1da177e4 LT |
912 | } |
913 | ||
914 | ||
915 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
916 | { | |
60236fdd | 917 | struct request_sock *req, **prev; |
aa8223c7 | 918 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
919 | struct sock *nsk; |
920 | ||
921 | /* Find possible connection requests. */ | |
8129765a | 922 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
923 | &ipv6_hdr(skb)->saddr, |
924 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 | 925 | if (req) |
8336886f | 926 | return tcp_check_req(sk, skb, req, prev, false); |
1da177e4 | 927 | |
3b1e0a65 | 928 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
929 | &ipv6_hdr(skb)->saddr, th->source, |
930 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
931 | |
932 | if (nsk) { | |
933 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
934 | bh_lock_sock(nsk); | |
935 | return nsk; | |
936 | } | |
9469c7b4 | 937 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
938 | return NULL; |
939 | } | |
940 | ||
c6aefafb | 941 | #ifdef CONFIG_SYN_COOKIES |
af9b4738 | 942 | if (!th->syn) |
c6aefafb | 943 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
944 | #endif |
945 | return sk; | |
946 | } | |
947 | ||
1da177e4 LT |
948 | /* FIXME: this is substantially similar to the ipv4 code. |
949 | * Can some kind of merge be done? -- erics | |
950 | */ | |
951 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
952 | { | |
e6b4d113 WAS |
953 | struct tcp_options_received tmp_opt; |
954 | struct request_sock *req; | |
634fb979 | 955 | struct inet_request_sock *ireq; |
1da177e4 | 956 | struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 | 957 | struct tcp_sock *tp = tcp_sk(sk); |
e6b4d113 | 958 | __u32 isn = TCP_SKB_CB(skb)->when; |
493f377d | 959 | struct dst_entry *dst = NULL; |
3840a06e | 960 | struct flowi6 fl6; |
a2a385d6 | 961 | bool want_cookie = false; |
1da177e4 LT |
962 | |
963 | if (skb->protocol == htons(ETH_P_IP)) | |
964 | return tcp_v4_conn_request(sk, skb); | |
965 | ||
966 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 967 | goto drop; |
1da177e4 | 968 | |
5ad37d5d HFS |
969 | if ((sysctl_tcp_syncookies == 2 || |
970 | inet_csk_reqsk_queue_is_full(sk)) && !isn) { | |
946cedcc ED |
971 | want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6"); |
972 | if (!want_cookie) | |
973 | goto drop; | |
1da177e4 LT |
974 | } |
975 | ||
5f1e942c VS |
976 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) { |
977 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); | |
1da177e4 | 978 | goto drop; |
5f1e942c | 979 | } |
1da177e4 | 980 | |
ca304b61 | 981 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
982 | if (req == NULL) |
983 | goto drop; | |
984 | ||
cfb6eeb4 YH |
985 | #ifdef CONFIG_TCP_MD5SIG |
986 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
987 | #endif | |
988 | ||
1da177e4 LT |
989 | tcp_clear_options(&tmp_opt); |
990 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
991 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
1a2c6181 | 992 | tcp_parse_options(skb, &tmp_opt, 0, NULL); |
1da177e4 | 993 | |
4dfc2817 | 994 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 995 | tcp_clear_options(&tmp_opt); |
c6aefafb | 996 | |
1da177e4 LT |
997 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
998 | tcp_openreq_init(req, &tmp_opt, skb); | |
999 | ||
634fb979 ED |
1000 | ireq = inet_rsk(req); |
1001 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
1002 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
172d69e6 | 1003 | if (!want_cookie || tmp_opt.tstamp_ok) |
5d134f1c | 1004 | TCP_ECN_create_request(req, skb, sock_net(sk)); |
c6aefafb | 1005 | |
634fb979 | 1006 | ireq->ir_iif = sk->sk_bound_dev_if; |
4d0fe50c ED |
1007 | |
1008 | /* So that link locals have meaning */ | |
1009 | if (!sk->sk_bound_dev_if && | |
634fb979 ED |
1010 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
1011 | ireq->ir_iif = inet6_iif(skb); | |
4d0fe50c | 1012 | |
2bbdf389 | 1013 | if (!isn) { |
c6aefafb GG |
1014 | if (ipv6_opt_accepted(sk, skb) || |
1015 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1016 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1017 | atomic_inc(&skb->users); | |
634fb979 | 1018 | ireq->pktopts = skb; |
c6aefafb | 1019 | } |
493f377d DM |
1020 | |
1021 | if (want_cookie) { | |
2bbdf389 FW |
1022 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); |
1023 | req->cookie_ts = tmp_opt.tstamp_ok; | |
493f377d DM |
1024 | goto have_isn; |
1025 | } | |
1026 | ||
1027 | /* VJ's idea. We save last timestamp seen | |
1028 | * from the destination in peer table, when entering | |
1029 | * state TIME-WAIT, and check against it before | |
1030 | * accepting new connection request. | |
1031 | * | |
1032 | * If "isn" is not zero, this request hit alive | |
1033 | * timewait bucket, so that all the necessary checks | |
1034 | * are made in the function processing timewait state. | |
1035 | */ | |
1036 | if (tmp_opt.saw_tstamp && | |
1037 | tcp_death_row.sysctl_tw_recycle && | |
81166dd6 DM |
1038 | (dst = inet6_csk_route_req(sk, &fl6, req)) != NULL) { |
1039 | if (!tcp_peer_is_proven(req, dst, true)) { | |
493f377d DM |
1040 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); |
1041 | goto drop_and_release; | |
1042 | } | |
1043 | } | |
1044 | /* Kill the following clause, if you dislike this way. */ | |
1045 | else if (!sysctl_tcp_syncookies && | |
1046 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < | |
1047 | (sysctl_max_syn_backlog >> 2)) && | |
81166dd6 | 1048 | !tcp_peer_is_proven(req, dst, false)) { |
493f377d DM |
1049 | /* Without syncookies last quarter of |
1050 | * backlog is filled with destinations, | |
1051 | * proven to be alive. | |
1052 | * It means that we continue to communicate | |
1053 | * to destinations, already remembered | |
1054 | * to the moment of synflood. | |
1055 | */ | |
1056 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n", | |
634fb979 | 1057 | &ireq->ir_v6_rmt_addr, ntohs(tcp_hdr(skb)->source)); |
493f377d | 1058 | goto drop_and_release; |
2bbdf389 | 1059 | } |
493f377d DM |
1060 | |
1061 | isn = tcp_v6_init_sequence(skb); | |
c6aefafb | 1062 | } |
493f377d | 1063 | have_isn: |
2e6599cb | 1064 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1065 | |
437c5b53 NC |
1066 | if (security_inet_conn_request(sk, skb, req)) |
1067 | goto drop_and_release; | |
4237c75c | 1068 | |
9f10d3f6 | 1069 | if (tcp_v6_send_synack(sk, dst, &fl6, req, |
fff32699 | 1070 | skb_get_queue_mapping(skb)) || |
4957faad | 1071 | want_cookie) |
e6b4d113 | 1072 | goto drop_and_free; |
1da177e4 | 1073 | |
016818d0 | 1074 | tcp_rsk(req)->snt_synack = tcp_time_stamp; |
8336886f | 1075 | tcp_rsk(req)->listener = NULL; |
e6b4d113 WAS |
1076 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1077 | return 0; | |
1da177e4 | 1078 | |
493f377d DM |
1079 | drop_and_release: |
1080 | dst_release(dst); | |
e6b4d113 WAS |
1081 | drop_and_free: |
1082 | reqsk_free(req); | |
1da177e4 | 1083 | drop: |
5f1e942c | 1084 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1085 | return 0; /* don't send reset */ |
1086 | } | |
1087 | ||
1088 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1089 | struct request_sock *req, |
1da177e4 LT |
1090 | struct dst_entry *dst) |
1091 | { | |
634fb979 | 1092 | struct inet_request_sock *ireq; |
1da177e4 LT |
1093 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1094 | struct tcp6_sock *newtcp6sk; | |
1095 | struct inet_sock *newinet; | |
1096 | struct tcp_sock *newtp; | |
1097 | struct sock *newsk; | |
cfb6eeb4 YH |
1098 | #ifdef CONFIG_TCP_MD5SIG |
1099 | struct tcp_md5sig_key *key; | |
1100 | #endif | |
3840a06e | 1101 | struct flowi6 fl6; |
1da177e4 LT |
1102 | |
1103 | if (skb->protocol == htons(ETH_P_IP)) { | |
1104 | /* | |
1105 | * v6 mapped | |
1106 | */ | |
1107 | ||
1108 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1109 | ||
1ab1457c | 1110 | if (newsk == NULL) |
1da177e4 LT |
1111 | return NULL; |
1112 | ||
1113 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1114 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1115 | ||
1116 | newinet = inet_sk(newsk); | |
1117 | newnp = inet6_sk(newsk); | |
1118 | newtp = tcp_sk(newsk); | |
1119 | ||
1120 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1121 | ||
efe4208f | 1122 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newsk->sk_v6_daddr); |
1da177e4 | 1123 | |
c720c7e8 | 1124 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 | 1125 | |
efe4208f | 1126 | newsk->sk_v6_rcv_saddr = newnp->saddr; |
1da177e4 | 1127 | |
8292a17a | 1128 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1129 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1130 | #ifdef CONFIG_TCP_MD5SIG |
1131 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1132 | #endif | |
1133 | ||
676a1184 YZ |
1134 | newnp->ipv6_ac_list = NULL; |
1135 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1136 | newnp->pktoptions = NULL; |
1137 | newnp->opt = NULL; | |
505cbfc5 | 1138 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1139 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1140 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
1da177e4 | 1141 | |
e6848976 ACM |
1142 | /* |
1143 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1144 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1145 | * that function for the gory details. -acme | |
1da177e4 | 1146 | */ |
1da177e4 LT |
1147 | |
1148 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1149 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1150 | Sync it now. |
1151 | */ | |
d83d8461 | 1152 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1153 | |
1154 | return newsk; | |
1155 | } | |
1156 | ||
634fb979 | 1157 | ireq = inet_rsk(req); |
1da177e4 LT |
1158 | |
1159 | if (sk_acceptq_is_full(sk)) | |
1160 | goto out_overflow; | |
1161 | ||
493f377d | 1162 | if (!dst) { |
3840a06e | 1163 | dst = inet6_csk_route_req(sk, &fl6, req); |
493f377d | 1164 | if (!dst) |
1da177e4 | 1165 | goto out; |
1ab1457c | 1166 | } |
1da177e4 LT |
1167 | |
1168 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1169 | if (newsk == NULL) | |
093d2823 | 1170 | goto out_nonewsk; |
1da177e4 | 1171 | |
e6848976 ACM |
1172 | /* |
1173 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1174 | * count here, tcp_create_openreq_child now does this for us, see the | |
1175 | * comment in that function for the gory details. -acme | |
1176 | */ | |
1da177e4 | 1177 | |
59eed279 | 1178 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1179 | __ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1180 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1181 | |
1182 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1183 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1184 | ||
1185 | newtp = tcp_sk(newsk); | |
1186 | newinet = inet_sk(newsk); | |
1187 | newnp = inet6_sk(newsk); | |
1188 | ||
1189 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1190 | ||
634fb979 ED |
1191 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1192 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1193 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1194 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1195 | |
1ab1457c | 1196 | /* Now IPv6 options... |
1da177e4 LT |
1197 | |
1198 | First: no IPv4 options. | |
1199 | */ | |
f6d8bd05 | 1200 | newinet->inet_opt = NULL; |
676a1184 | 1201 | newnp->ipv6_ac_list = NULL; |
d35690be | 1202 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1203 | |
1204 | /* Clone RX bits */ | |
1205 | newnp->rxopt.all = np->rxopt.all; | |
1206 | ||
1207 | /* Clone pktoptions received with SYN */ | |
1208 | newnp->pktoptions = NULL; | |
634fb979 ED |
1209 | if (ireq->pktopts != NULL) { |
1210 | newnp->pktoptions = skb_clone(ireq->pktopts, | |
99a1dec7 | 1211 | sk_gfp_atomic(sk, GFP_ATOMIC)); |
634fb979 ED |
1212 | consume_skb(ireq->pktopts); |
1213 | ireq->pktopts = NULL; | |
1da177e4 LT |
1214 | if (newnp->pktoptions) |
1215 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1216 | } | |
1217 | newnp->opt = NULL; | |
505cbfc5 | 1218 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1219 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1220 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
1da177e4 LT |
1221 | |
1222 | /* Clone native IPv6 options from listening socket (if any) | |
1223 | ||
1224 | Yes, keeping reference count would be much more clever, | |
1225 | but we make one more one thing there: reattach optmem | |
1226 | to newsk. | |
1227 | */ | |
43264e0b RL |
1228 | if (np->opt) |
1229 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
1da177e4 | 1230 | |
d83d8461 | 1231 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1232 | if (newnp->opt) |
d83d8461 ACM |
1233 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1234 | newnp->opt->opt_flen); | |
1da177e4 | 1235 | |
5d424d5a | 1236 | tcp_mtup_init(newsk); |
1da177e4 | 1237 | tcp_sync_mss(newsk, dst_mtu(dst)); |
0dbaee3b | 1238 | newtp->advmss = dst_metric_advmss(dst); |
d135c522 NC |
1239 | if (tcp_sk(sk)->rx_opt.user_mss && |
1240 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1241 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1242 | ||
1da177e4 LT |
1243 | tcp_initialize_rcv_mss(newsk); |
1244 | ||
c720c7e8 ED |
1245 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1246 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1247 | |
cfb6eeb4 YH |
1248 | #ifdef CONFIG_TCP_MD5SIG |
1249 | /* Copy over the MD5 key from the original socket */ | |
efe4208f | 1250 | if ((key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr)) != NULL) { |
cfb6eeb4 YH |
1251 | /* We're using one, so create a matching key |
1252 | * on the newsk structure. If we fail to get | |
1253 | * memory, then we end up not copying the key | |
1254 | * across. Shucks. | |
1255 | */ | |
efe4208f | 1256 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
99a1dec7 MG |
1257 | AF_INET6, key->key, key->keylen, |
1258 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
cfb6eeb4 YH |
1259 | } |
1260 | #endif | |
1261 | ||
093d2823 | 1262 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1263 | inet_csk_prepare_forced_close(newsk); |
1264 | tcp_done(newsk); | |
093d2823 BS |
1265 | goto out; |
1266 | } | |
9327f705 | 1267 | __inet6_hash(newsk, NULL); |
1da177e4 LT |
1268 | |
1269 | return newsk; | |
1270 | ||
1271 | out_overflow: | |
de0744af | 1272 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1273 | out_nonewsk: |
1da177e4 | 1274 | dst_release(dst); |
093d2823 BS |
1275 | out: |
1276 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); | |
1da177e4 LT |
1277 | return NULL; |
1278 | } | |
1279 | ||
b51655b9 | 1280 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1281 | { |
84fa7933 | 1282 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
684f2176 | 1283 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1284 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1285 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1286 | return 0; |
fb286bb2 | 1287 | } |
1da177e4 | 1288 | } |
fb286bb2 | 1289 | |
684f2176 | 1290 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
0660e03f ACM |
1291 | &ipv6_hdr(skb)->saddr, |
1292 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1293 | |
1da177e4 | 1294 | if (skb->len <= 76) { |
fb286bb2 | 1295 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1296 | } |
1297 | return 0; | |
1298 | } | |
1299 | ||
1300 | /* The socket must have it's spinlock held when we get | |
1301 | * here. | |
1302 | * | |
1303 | * We have a potential double-lock case here, so even when | |
1304 | * doing backlog processing we use the BH locking scheme. | |
1305 | * This is because we cannot sleep with the original spinlock | |
1306 | * held. | |
1307 | */ | |
1308 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1309 | { | |
1310 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1311 | struct tcp_sock *tp; | |
1312 | struct sk_buff *opt_skb = NULL; | |
1313 | ||
1314 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1315 | goes to IPv4 receive handler and backlogged. | |
1316 | From backlog it always goes here. Kerboom... | |
1317 | Fortunately, tcp_rcv_established and rcv_established | |
1318 | handle them correctly, but it is not case with | |
1319 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1320 | */ | |
1321 | ||
1322 | if (skb->protocol == htons(ETH_P_IP)) | |
1323 | return tcp_v4_do_rcv(sk, skb); | |
1324 | ||
cfb6eeb4 YH |
1325 | #ifdef CONFIG_TCP_MD5SIG |
1326 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1327 | goto discard; | |
1328 | #endif | |
1329 | ||
fda9ef5d | 1330 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1331 | goto discard; |
1332 | ||
1333 | /* | |
1334 | * socket locking is here for SMP purposes as backlog rcv | |
1335 | * is currently called with bh processing disabled. | |
1336 | */ | |
1337 | ||
1338 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1339 | ||
1340 | Yes, guys, it is the only place in our code, where we | |
1341 | may make it not affecting IPv4. | |
1342 | The rest of code is protocol independent, | |
1343 | and I do not like idea to uglify IPv4. | |
1344 | ||
1345 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1346 | looks not very well thought. For now we latch | |
1347 | options, received in the last packet, enqueued | |
1348 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1349 | --ANK (980728) |
1da177e4 LT |
1350 | */ |
1351 | if (np->rxopt.all) | |
99a1dec7 | 1352 | opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC)); |
1da177e4 LT |
1353 | |
1354 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1355 | struct dst_entry *dst = sk->sk_rx_dst; |
1356 | ||
bdeab991 | 1357 | sock_rps_save_rxhash(sk, skb); |
5d299f3d ED |
1358 | if (dst) { |
1359 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1360 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1361 | dst_release(dst); | |
1362 | sk->sk_rx_dst = NULL; | |
1363 | } | |
1364 | } | |
1365 | ||
c995ae22 | 1366 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
1da177e4 LT |
1367 | if (opt_skb) |
1368 | goto ipv6_pktoptions; | |
1369 | return 0; | |
1370 | } | |
1371 | ||
ab6a5bb6 | 1372 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1373 | goto csum_err; |
1374 | ||
1ab1457c | 1375 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1376 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1377 | if (!nsk) | |
1378 | goto discard; | |
1379 | ||
1380 | /* | |
1381 | * Queue it on the new socket if the new socket is active, | |
1382 | * otherwise we just shortcircuit this and continue with | |
1383 | * the new socket.. | |
1384 | */ | |
1ab1457c | 1385 | if(nsk != sk) { |
bdeab991 | 1386 | sock_rps_save_rxhash(nsk, skb); |
1da177e4 LT |
1387 | if (tcp_child_process(sk, nsk, skb)) |
1388 | goto reset; | |
1389 | if (opt_skb) | |
1390 | __kfree_skb(opt_skb); | |
1391 | return 0; | |
1392 | } | |
47482f13 | 1393 | } else |
bdeab991 | 1394 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1395 | |
aa8223c7 | 1396 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1397 | goto reset; |
1da177e4 LT |
1398 | if (opt_skb) |
1399 | goto ipv6_pktoptions; | |
1400 | return 0; | |
1401 | ||
1402 | reset: | |
cfb6eeb4 | 1403 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1404 | discard: |
1405 | if (opt_skb) | |
1406 | __kfree_skb(opt_skb); | |
1407 | kfree_skb(skb); | |
1408 | return 0; | |
1409 | csum_err: | |
6a5dc9e5 | 1410 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); |
63231bdd | 1411 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1412 | goto discard; |
1413 | ||
1414 | ||
1415 | ipv6_pktoptions: | |
1416 | /* Do you ask, what is it? | |
1417 | ||
1418 | 1. skb was enqueued by tcp. | |
1419 | 2. skb is added to tail of read queue, rather than out of order. | |
1420 | 3. socket is not in passive state. | |
1421 | 4. Finally, it really contains options, which user wants to receive. | |
1422 | */ | |
1423 | tp = tcp_sk(sk); | |
1424 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1425 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1426 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1427 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1428 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1429 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
82e9f105 | 1430 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1431 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
1da177e4 LT |
1432 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1433 | skb_set_owner_r(opt_skb, sk); | |
1434 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1435 | } else { | |
1436 | __kfree_skb(opt_skb); | |
1437 | opt_skb = xchg(&np->pktoptions, NULL); | |
1438 | } | |
1439 | } | |
1440 | ||
800d55f1 | 1441 | kfree_skb(opt_skb); |
1da177e4 LT |
1442 | return 0; |
1443 | } | |
1444 | ||
e5bbef20 | 1445 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1446 | { |
cf533ea5 | 1447 | const struct tcphdr *th; |
b71d1d42 | 1448 | const struct ipv6hdr *hdr; |
1da177e4 LT |
1449 | struct sock *sk; |
1450 | int ret; | |
a86b1e30 | 1451 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1452 | |
1453 | if (skb->pkt_type != PACKET_HOST) | |
1454 | goto discard_it; | |
1455 | ||
1456 | /* | |
1457 | * Count it even if it's bad. | |
1458 | */ | |
63231bdd | 1459 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1460 | |
1461 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1462 | goto discard_it; | |
1463 | ||
aa8223c7 | 1464 | th = tcp_hdr(skb); |
1da177e4 LT |
1465 | |
1466 | if (th->doff < sizeof(struct tcphdr)/4) | |
1467 | goto bad_packet; | |
1468 | if (!pskb_may_pull(skb, th->doff*4)) | |
1469 | goto discard_it; | |
1470 | ||
60476372 | 1471 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
6a5dc9e5 | 1472 | goto csum_error; |
1da177e4 | 1473 | |
aa8223c7 | 1474 | th = tcp_hdr(skb); |
e802af9c | 1475 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
1476 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1477 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1478 | skb->len - th->doff*4); | |
1479 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1480 | TCP_SKB_CB(skb)->when = 0; | |
b82d1bb4 | 1481 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); |
1da177e4 LT |
1482 | TCP_SKB_CB(skb)->sacked = 0; |
1483 | ||
9a1f27c4 | 1484 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1485 | if (!sk) |
1486 | goto no_tcp_socket; | |
1487 | ||
1488 | process: | |
1489 | if (sk->sk_state == TCP_TIME_WAIT) | |
1490 | goto do_time_wait; | |
1491 | ||
e802af9c SH |
1492 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1493 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1494 | goto discard_and_relse; | |
1495 | } | |
1496 | ||
1da177e4 LT |
1497 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1498 | goto discard_and_relse; | |
1499 | ||
fda9ef5d | 1500 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1501 | goto discard_and_relse; |
1502 | ||
8b80cda5 | 1503 | sk_mark_napi_id(sk, skb); |
1da177e4 LT |
1504 | skb->dev = NULL; |
1505 | ||
293b9c42 | 1506 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1507 | ret = 0; |
1508 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1509 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1510 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a | 1511 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
a2bd1140 | 1512 | tp->ucopy.dma_chan = net_dma_find_channel(); |
1ab1457c YH |
1513 | if (tp->ucopy.dma_chan) |
1514 | ret = tcp_v6_do_rcv(sk, skb); | |
1515 | else | |
1a2449a8 CL |
1516 | #endif |
1517 | { | |
1518 | if (!tcp_prequeue(sk, skb)) | |
1519 | ret = tcp_v6_do_rcv(sk, skb); | |
1520 | } | |
da882c1f ED |
1521 | } else if (unlikely(sk_add_backlog(sk, skb, |
1522 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1523 | bh_unlock_sock(sk); |
6cce09f8 | 1524 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1525 | goto discard_and_relse; |
1526 | } | |
1da177e4 LT |
1527 | bh_unlock_sock(sk); |
1528 | ||
1529 | sock_put(sk); | |
1530 | return ret ? -1 : 0; | |
1531 | ||
1532 | no_tcp_socket: | |
1533 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1534 | goto discard_it; | |
1535 | ||
1536 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
6a5dc9e5 ED |
1537 | csum_error: |
1538 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); | |
1da177e4 | 1539 | bad_packet: |
63231bdd | 1540 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1541 | } else { |
cfb6eeb4 | 1542 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1543 | } |
1544 | ||
1545 | discard_it: | |
1da177e4 LT |
1546 | kfree_skb(skb); |
1547 | return 0; | |
1548 | ||
1549 | discard_and_relse: | |
1550 | sock_put(sk); | |
1551 | goto discard_it; | |
1552 | ||
1553 | do_time_wait: | |
1554 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1555 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1556 | goto discard_it; |
1557 | } | |
1558 | ||
6a5dc9e5 | 1559 | if (skb->len < (th->doff<<2)) { |
9469c7b4 | 1560 | inet_twsk_put(inet_twsk(sk)); |
6a5dc9e5 ED |
1561 | goto bad_packet; |
1562 | } | |
1563 | if (tcp_checksum_complete(skb)) { | |
1564 | inet_twsk_put(inet_twsk(sk)); | |
1565 | goto csum_error; | |
1da177e4 LT |
1566 | } |
1567 | ||
9469c7b4 | 1568 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1569 | case TCP_TW_SYN: |
1570 | { | |
1571 | struct sock *sk2; | |
1572 | ||
c346dca1 | 1573 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
5ba24953 | 1574 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1575 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1576 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1577 | if (sk2 != NULL) { |
295ff7ed ACM |
1578 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1579 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1580 | inet_twsk_put(tw); | |
1da177e4 LT |
1581 | sk = sk2; |
1582 | goto process; | |
1583 | } | |
1584 | /* Fall through to ACK */ | |
1585 | } | |
1586 | case TCP_TW_ACK: | |
1587 | tcp_v6_timewait_ack(sk, skb); | |
1588 | break; | |
1589 | case TCP_TW_RST: | |
1590 | goto no_tcp_socket; | |
1591 | case TCP_TW_SUCCESS:; | |
1592 | } | |
1593 | goto discard_it; | |
1594 | } | |
1595 | ||
c7109986 ED |
1596 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1597 | { | |
1598 | const struct ipv6hdr *hdr; | |
1599 | const struct tcphdr *th; | |
1600 | struct sock *sk; | |
1601 | ||
1602 | if (skb->pkt_type != PACKET_HOST) | |
1603 | return; | |
1604 | ||
1605 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1606 | return; | |
1607 | ||
1608 | hdr = ipv6_hdr(skb); | |
1609 | th = tcp_hdr(skb); | |
1610 | ||
1611 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1612 | return; | |
1613 | ||
1614 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, | |
1615 | &hdr->saddr, th->source, | |
1616 | &hdr->daddr, ntohs(th->dest), | |
1617 | inet6_iif(skb)); | |
1618 | if (sk) { | |
1619 | skb->sk = sk; | |
1620 | skb->destructor = sock_edemux; | |
1621 | if (sk->sk_state != TCP_TIME_WAIT) { | |
1622 | struct dst_entry *dst = sk->sk_rx_dst; | |
f3f12135 | 1623 | |
c7109986 | 1624 | if (dst) |
5d299f3d | 1625 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1626 | if (dst && |
f3f12135 | 1627 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1628 | skb_dst_set_noref(skb, dst); |
1629 | } | |
1630 | } | |
1631 | } | |
1632 | ||
ccb7c410 DM |
1633 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1634 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1635 | .twsk_unique = tcp_twsk_unique, | |
1636 | .twsk_destructor= tcp_twsk_destructor, | |
ccb7c410 DM |
1637 | }; |
1638 | ||
3b401a81 | 1639 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1640 | .queue_xmit = inet6_csk_xmit, |
1641 | .send_check = tcp_v6_send_check, | |
1642 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1643 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1644 | .conn_request = tcp_v6_conn_request, |
1645 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1646 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1647 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1648 | .setsockopt = ipv6_setsockopt, |
1649 | .getsockopt = ipv6_getsockopt, | |
1650 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1651 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1652 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1653 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1654 | .compat_setsockopt = compat_ipv6_setsockopt, |
1655 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1656 | #endif |
1da177e4 LT |
1657 | }; |
1658 | ||
cfb6eeb4 | 1659 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1660 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1661 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1662 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1663 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1664 | }; |
a928630a | 1665 | #endif |
cfb6eeb4 | 1666 | |
1da177e4 LT |
1667 | /* |
1668 | * TCP over IPv4 via INET6 API | |
1669 | */ | |
1670 | ||
3b401a81 | 1671 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1672 | .queue_xmit = ip_queue_xmit, |
1673 | .send_check = tcp_v4_send_check, | |
1674 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1675 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1676 | .conn_request = tcp_v6_conn_request, |
1677 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1678 | .net_header_len = sizeof(struct iphdr), |
1679 | .setsockopt = ipv6_setsockopt, | |
1680 | .getsockopt = ipv6_getsockopt, | |
1681 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1682 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1683 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1684 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1685 | .compat_setsockopt = compat_ipv6_setsockopt, |
1686 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1687 | #endif |
1da177e4 LT |
1688 | }; |
1689 | ||
cfb6eeb4 | 1690 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1691 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1692 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1693 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1694 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1695 | }; |
a928630a | 1696 | #endif |
cfb6eeb4 | 1697 | |
1da177e4 LT |
1698 | /* NOTE: A lot of things set to zero explicitly by call to |
1699 | * sk_alloc() so need not be done here. | |
1700 | */ | |
1701 | static int tcp_v6_init_sock(struct sock *sk) | |
1702 | { | |
6687e988 | 1703 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1704 | |
900f65d3 | 1705 | tcp_init_sock(sk); |
1da177e4 | 1706 | |
8292a17a | 1707 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1708 | |
cfb6eeb4 | 1709 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1710 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1711 | #endif |
1712 | ||
1da177e4 LT |
1713 | return 0; |
1714 | } | |
1715 | ||
7d06b2e0 | 1716 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1717 | { |
1da177e4 | 1718 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1719 | inet6_destroy_sock(sk); |
1da177e4 LT |
1720 | } |
1721 | ||
952a10be | 1722 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1723 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1724 | static void get_openreq6(struct seq_file *seq, |
a7cb5a49 | 1725 | const struct sock *sk, struct request_sock *req, int i, kuid_t uid) |
1da177e4 | 1726 | { |
1da177e4 | 1727 | int ttd = req->expires - jiffies; |
634fb979 ED |
1728 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1729 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1730 | |
1731 | if (ttd < 0) | |
1732 | ttd = 0; | |
1733 | ||
1da177e4 LT |
1734 | seq_printf(seq, |
1735 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1736 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1737 | i, |
1738 | src->s6_addr32[0], src->s6_addr32[1], | |
1739 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1740 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1741 | dest->s6_addr32[0], dest->s6_addr32[1], |
1742 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1743 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 LT |
1744 | TCP_SYN_RECV, |
1745 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
1746 | 1, /* timers active (only the expire timer) */ |
1747 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1748 | req->num_timeout, |
a7cb5a49 | 1749 | from_kuid_munged(seq_user_ns(seq), uid), |
1ab1457c | 1750 | 0, /* non standard timer */ |
1da177e4 LT |
1751 | 0, /* open_requests have no inode */ |
1752 | 0, req); | |
1753 | } | |
1754 | ||
1755 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1756 | { | |
b71d1d42 | 1757 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1758 | __u16 destp, srcp; |
1759 | int timer_active; | |
1760 | unsigned long timer_expires; | |
cf533ea5 ED |
1761 | const struct inet_sock *inet = inet_sk(sp); |
1762 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1763 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 | 1764 | |
efe4208f ED |
1765 | dest = &sp->sk_v6_daddr; |
1766 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1767 | destp = ntohs(inet->inet_dport); |
1768 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
1769 | |
1770 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1771 | timer_active = 1; |
463c84b9 ACM |
1772 | timer_expires = icsk->icsk_timeout; |
1773 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1774 | timer_active = 4; |
463c84b9 | 1775 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1776 | } else if (timer_pending(&sp->sk_timer)) { |
1777 | timer_active = 2; | |
1778 | timer_expires = sp->sk_timer.expires; | |
1779 | } else { | |
1780 | timer_active = 0; | |
1781 | timer_expires = jiffies; | |
1782 | } | |
1783 | ||
1784 | seq_printf(seq, | |
1785 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1786 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1787 | i, |
1788 | src->s6_addr32[0], src->s6_addr32[1], | |
1789 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1790 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1791 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1792 | sp->sk_state, |
47da8ee6 SS |
1793 | tp->write_seq-tp->snd_una, |
1794 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 | 1795 | timer_active, |
a399a805 | 1796 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1797 | icsk->icsk_retransmits, |
a7cb5a49 | 1798 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1799 | icsk->icsk_probes_out, |
1da177e4 LT |
1800 | sock_i_ino(sp), |
1801 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1802 | jiffies_to_clock_t(icsk->icsk_rto), |
1803 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 1804 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
0b6a05c1 IJ |
1805 | tp->snd_cwnd, |
1806 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh | |
1da177e4 LT |
1807 | ); |
1808 | } | |
1809 | ||
1ab1457c | 1810 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1811 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1812 | { |
b71d1d42 | 1813 | const struct in6_addr *dest, *src; |
1da177e4 | 1814 | __u16 destp, srcp; |
96f817fe | 1815 | s32 delta = tw->tw_ttd - inet_tw_time_stamp(); |
1da177e4 | 1816 | |
efe4208f ED |
1817 | dest = &tw->tw_v6_daddr; |
1818 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1819 | destp = ntohs(tw->tw_dport); |
1820 | srcp = ntohs(tw->tw_sport); | |
1821 | ||
1822 | seq_printf(seq, | |
1823 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1824 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1825 | i, |
1826 | src->s6_addr32[0], src->s6_addr32[1], | |
1827 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1828 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1829 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1830 | tw->tw_substate, 0, 0, | |
a399a805 | 1831 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
1da177e4 LT |
1832 | atomic_read(&tw->tw_refcnt), tw); |
1833 | } | |
1834 | ||
1da177e4 LT |
1835 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1836 | { | |
1837 | struct tcp_iter_state *st; | |
05dbc7b5 | 1838 | struct sock *sk = v; |
1da177e4 LT |
1839 | |
1840 | if (v == SEQ_START_TOKEN) { | |
1841 | seq_puts(seq, | |
1842 | " sl " | |
1843 | "local_address " | |
1844 | "remote_address " | |
1845 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1846 | " uid timeout inode\n"); | |
1847 | goto out; | |
1848 | } | |
1849 | st = seq->private; | |
1850 | ||
1851 | switch (st->state) { | |
1852 | case TCP_SEQ_STATE_LISTENING: | |
1853 | case TCP_SEQ_STATE_ESTABLISHED: | |
05dbc7b5 ED |
1854 | if (sk->sk_state == TCP_TIME_WAIT) |
1855 | get_timewait6_sock(seq, v, st->num); | |
1856 | else | |
1857 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
1858 | break; |
1859 | case TCP_SEQ_STATE_OPENREQ: | |
1860 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
1861 | break; | |
1da177e4 LT |
1862 | } |
1863 | out: | |
1864 | return 0; | |
1865 | } | |
1866 | ||
73cb88ec AV |
1867 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1868 | .owner = THIS_MODULE, | |
1869 | .open = tcp_seq_open, | |
1870 | .read = seq_read, | |
1871 | .llseek = seq_lseek, | |
1872 | .release = seq_release_net | |
1873 | }; | |
1874 | ||
1da177e4 | 1875 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1876 | .name = "tcp6", |
1877 | .family = AF_INET6, | |
73cb88ec | 1878 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
1879 | .seq_ops = { |
1880 | .show = tcp6_seq_show, | |
1881 | }, | |
1da177e4 LT |
1882 | }; |
1883 | ||
2c8c1e72 | 1884 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1885 | { |
6f8b13bc | 1886 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1887 | } |
1888 | ||
6f8b13bc | 1889 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1890 | { |
6f8b13bc | 1891 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1892 | } |
1893 | #endif | |
1894 | ||
f77d6021 ED |
1895 | static void tcp_v6_clear_sk(struct sock *sk, int size) |
1896 | { | |
1897 | struct inet_sock *inet = inet_sk(sk); | |
1898 | ||
1899 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1900 | sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1901 | ||
1902 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1903 | memset(&inet->pinet6 + 1, 0, size); | |
1904 | } | |
1905 | ||
1da177e4 LT |
1906 | struct proto tcpv6_prot = { |
1907 | .name = "TCPv6", | |
1908 | .owner = THIS_MODULE, | |
1909 | .close = tcp_close, | |
1910 | .connect = tcp_v6_connect, | |
1911 | .disconnect = tcp_disconnect, | |
463c84b9 | 1912 | .accept = inet_csk_accept, |
1da177e4 LT |
1913 | .ioctl = tcp_ioctl, |
1914 | .init = tcp_v6_init_sock, | |
1915 | .destroy = tcp_v6_destroy_sock, | |
1916 | .shutdown = tcp_shutdown, | |
1917 | .setsockopt = tcp_setsockopt, | |
1918 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 1919 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
1920 | .sendmsg = tcp_sendmsg, |
1921 | .sendpage = tcp_sendpage, | |
1da177e4 | 1922 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 1923 | .release_cb = tcp_release_cb, |
563d34d0 | 1924 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 | 1925 | .hash = tcp_v6_hash, |
ab1e0a13 ACM |
1926 | .unhash = inet_unhash, |
1927 | .get_port = inet_csk_get_port, | |
1da177e4 | 1928 | .enter_memory_pressure = tcp_enter_memory_pressure, |
c9bee3b7 | 1929 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
1930 | .sockets_allocated = &tcp_sockets_allocated, |
1931 | .memory_allocated = &tcp_memory_allocated, | |
1932 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1933 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 1934 | .sysctl_mem = sysctl_tcp_mem, |
1da177e4 LT |
1935 | .sysctl_wmem = sysctl_tcp_wmem, |
1936 | .sysctl_rmem = sysctl_tcp_rmem, | |
1937 | .max_header = MAX_TCP_HEADER, | |
1938 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 1939 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 1940 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1941 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 1942 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 1943 | .no_autobind = true, |
543d9cfe ACM |
1944 | #ifdef CONFIG_COMPAT |
1945 | .compat_setsockopt = compat_tcp_setsockopt, | |
1946 | .compat_getsockopt = compat_tcp_getsockopt, | |
1947 | #endif | |
c255a458 | 1948 | #ifdef CONFIG_MEMCG_KMEM |
d1a4c0b3 GC |
1949 | .proto_cgroup = tcp_proto_cgroup, |
1950 | #endif | |
f77d6021 | 1951 | .clear_sk = tcp_v6_clear_sk, |
1da177e4 LT |
1952 | }; |
1953 | ||
41135cc8 | 1954 | static const struct inet6_protocol tcpv6_protocol = { |
c7109986 | 1955 | .early_demux = tcp_v6_early_demux, |
1da177e4 LT |
1956 | .handler = tcp_v6_rcv, |
1957 | .err_handler = tcp_v6_err, | |
1958 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1959 | }; | |
1960 | ||
1da177e4 LT |
1961 | static struct inet_protosw tcpv6_protosw = { |
1962 | .type = SOCK_STREAM, | |
1963 | .protocol = IPPROTO_TCP, | |
1964 | .prot = &tcpv6_prot, | |
1965 | .ops = &inet6_stream_ops, | |
1da177e4 | 1966 | .no_check = 0, |
d83d8461 ACM |
1967 | .flags = INET_PROTOSW_PERMANENT | |
1968 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
1969 | }; |
1970 | ||
2c8c1e72 | 1971 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 1972 | { |
5677242f DL |
1973 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
1974 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
1975 | } |
1976 | ||
2c8c1e72 | 1977 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 1978 | { |
5677242f | 1979 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
1980 | } |
1981 | ||
2c8c1e72 | 1982 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
1983 | { |
1984 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
1985 | } |
1986 | ||
1987 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
1988 | .init = tcpv6_net_init, |
1989 | .exit = tcpv6_net_exit, | |
1990 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
1991 | }; |
1992 | ||
7f4e4868 | 1993 | int __init tcpv6_init(void) |
1da177e4 | 1994 | { |
7f4e4868 DL |
1995 | int ret; |
1996 | ||
3336288a VY |
1997 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
1998 | if (ret) | |
c6b641a4 | 1999 | goto out; |
3336288a | 2000 | |
1da177e4 | 2001 | /* register inet6 protocol */ |
7f4e4868 DL |
2002 | ret = inet6_register_protosw(&tcpv6_protosw); |
2003 | if (ret) | |
2004 | goto out_tcpv6_protocol; | |
2005 | ||
93ec926b | 2006 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2007 | if (ret) |
2008 | goto out_tcpv6_protosw; | |
2009 | out: | |
2010 | return ret; | |
ae0f7d5f | 2011 | |
7f4e4868 DL |
2012 | out_tcpv6_protosw: |
2013 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
2014 | out_tcpv6_protocol: |
2015 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
2016 | goto out; |
2017 | } | |
2018 | ||
09f7709f | 2019 | void tcpv6_exit(void) |
7f4e4868 | 2020 | { |
93ec926b | 2021 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2022 | inet6_unregister_protosw(&tcpv6_protosw); |
2023 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2024 | } |