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> |
4aa956d8 | 42 | #include <linux/uaccess.h> |
1da177e4 LT |
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 | 67 | |
1da177e4 LT |
68 | #include <linux/proc_fs.h> |
69 | #include <linux/seq_file.h> | |
70 | ||
cfb6eeb4 YH |
71 | #include <linux/crypto.h> |
72 | #include <linux/scatterlist.h> | |
73 | ||
cfb6eeb4 | 74 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
6edafaaf GJ |
75 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
76 | struct request_sock *req); | |
1da177e4 LT |
77 | |
78 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 79 | |
3b401a81 SH |
80 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
81 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 82 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
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; | |
9501f972 YH |
85 | #else |
86 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 87 | const struct in6_addr *addr) |
9501f972 YH |
88 | { |
89 | return NULL; | |
90 | } | |
a928630a | 91 | #endif |
1da177e4 | 92 | |
fae6ef87 NC |
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 | ||
1da177e4 LT |
105 | static void tcp_v6_hash(struct sock *sk) |
106 | { | |
107 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 108 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
109 | tcp_prot.hash(sk); |
110 | return; | |
111 | } | |
112 | local_bh_disable(); | |
9327f705 | 113 | __inet6_hash(sk, NULL); |
1da177e4 LT |
114 | local_bh_enable(); |
115 | } | |
116 | } | |
117 | ||
cf533ea5 | 118 | static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) |
1da177e4 | 119 | { |
0660e03f ACM |
120 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
121 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
122 | tcp_hdr(skb)->dest, |
123 | tcp_hdr(skb)->source); | |
1da177e4 LT |
124 | } |
125 | ||
1ab1457c | 126 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
127 | int addr_len) |
128 | { | |
129 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 130 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 131 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
132 | struct ipv6_pinfo *np = inet6_sk(sk); |
133 | struct tcp_sock *tp = tcp_sk(sk); | |
20c59de2 | 134 | struct in6_addr *saddr = NULL, *final_p, final; |
493f377d | 135 | struct rt6_info *rt; |
4c9483b2 | 136 | struct flowi6 fl6; |
1da177e4 LT |
137 | struct dst_entry *dst; |
138 | int addr_type; | |
139 | int err; | |
140 | ||
1ab1457c | 141 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
142 | return -EINVAL; |
143 | ||
1ab1457c | 144 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 145 | return -EAFNOSUPPORT; |
1da177e4 | 146 | |
4c9483b2 | 147 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
148 | |
149 | if (np->sndflow) { | |
4c9483b2 DM |
150 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
151 | IP6_ECN_flow_init(fl6.flowlabel); | |
152 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 153 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 154 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
1da177e4 LT |
155 | if (flowlabel == NULL) |
156 | return -EINVAL; | |
1da177e4 LT |
157 | fl6_sock_release(flowlabel); |
158 | } | |
159 | } | |
160 | ||
161 | /* | |
1ab1457c YH |
162 | * connect() to INADDR_ANY means loopback (BSD'ism). |
163 | */ | |
164 | ||
4c99aa40 | 165 | if (ipv6_addr_any(&usin->sin6_addr)) |
1ab1457c | 166 | usin->sin6_addr.s6_addr[15] = 0x1; |
1da177e4 LT |
167 | |
168 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
169 | ||
4c99aa40 | 170 | if (addr_type & IPV6_ADDR_MULTICAST) |
1da177e4 LT |
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 && | |
efe4208f | 192 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
1da177e4 LT |
193 | tp->rx_opt.ts_recent = 0; |
194 | tp->rx_opt.ts_recent_stamp = 0; | |
195 | tp->write_seq = 0; | |
196 | } | |
197 | ||
efe4208f | 198 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 199 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
200 | |
201 | /* | |
202 | * TCP over IPv4 | |
203 | */ | |
204 | ||
205 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 206 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
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 | ||
d83d8461 | 218 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 219 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
220 | #ifdef CONFIG_TCP_MD5SIG |
221 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
222 | #endif | |
1da177e4 LT |
223 | |
224 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
225 | ||
226 | if (err) { | |
d83d8461 ACM |
227 | icsk->icsk_ext_hdr_len = exthdrlen; |
228 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 229 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
230 | #ifdef CONFIG_TCP_MD5SIG |
231 | tp->af_specific = &tcp_sock_ipv6_specific; | |
232 | #endif | |
1da177e4 LT |
233 | goto failure; |
234 | } else { | |
c720c7e8 ED |
235 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
236 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, | |
efe4208f | 237 | &sk->sk_v6_rcv_saddr); |
1da177e4 LT |
238 | } |
239 | ||
240 | return err; | |
241 | } | |
242 | ||
efe4208f ED |
243 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
244 | saddr = &sk->sk_v6_rcv_saddr; | |
1da177e4 | 245 | |
4c9483b2 | 246 | fl6.flowi6_proto = IPPROTO_TCP; |
efe4208f | 247 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 248 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 DM |
249 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
250 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
251 | fl6.fl6_dport = usin->sin6_port; |
252 | fl6.fl6_sport = inet->inet_sport; | |
1da177e4 | 253 | |
4c9483b2 | 254 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
1da177e4 | 255 | |
4c9483b2 | 256 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 257 | |
0e0d44ab | 258 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
259 | if (IS_ERR(dst)) { |
260 | err = PTR_ERR(dst); | |
1da177e4 | 261 | goto failure; |
14e50e57 | 262 | } |
1da177e4 LT |
263 | |
264 | if (saddr == NULL) { | |
4c9483b2 | 265 | saddr = &fl6.saddr; |
efe4208f | 266 | sk->sk_v6_rcv_saddr = *saddr; |
1da177e4 LT |
267 | } |
268 | ||
269 | /* set the source address */ | |
4e3fd7a0 | 270 | np->saddr = *saddr; |
c720c7e8 | 271 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 272 | |
f83ef8c0 | 273 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 274 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 275 | |
493f377d DM |
276 | rt = (struct rt6_info *) dst; |
277 | if (tcp_death_row.sysctl_tw_recycle && | |
278 | !tp->rx_opt.ts_recent_stamp && | |
efe4208f | 279 | ipv6_addr_equal(&rt->rt6i_dst.addr, &sk->sk_v6_daddr)) |
81166dd6 | 280 | tcp_fetch_timewait_stamp(sk, dst); |
493f377d | 281 | |
d83d8461 | 282 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 283 | if (np->opt) |
d83d8461 ACM |
284 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
285 | np->opt->opt_nflen); | |
1da177e4 LT |
286 | |
287 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
288 | ||
c720c7e8 | 289 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
290 | |
291 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 292 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
293 | if (err) |
294 | goto late_failure; | |
295 | ||
2b916477 | 296 | if (!tp->write_seq && likely(!tp->repair)) |
1da177e4 | 297 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
efe4208f | 298 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
299 | inet->inet_sport, |
300 | inet->inet_dport); | |
1da177e4 LT |
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: | |
c720c7e8 | 312 | inet->inet_dport = 0; |
1da177e4 LT |
313 | sk->sk_route_caps = 0; |
314 | return err; | |
315 | } | |
316 | ||
563d34d0 ED |
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 | ||
1da177e4 | 334 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 335 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 336 | { |
4c99aa40 | 337 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
505cbfc5 | 338 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
339 | struct ipv6_pinfo *np; |
340 | struct sock *sk; | |
341 | int err; | |
1ab1457c | 342 | struct tcp_sock *tp; |
0a672f74 YC |
343 | struct request_sock *fastopen; |
344 | __u32 seq, snd_una; | |
ca12a1a4 | 345 | struct net *net = dev_net(skb->dev); |
1da177e4 | 346 | |
ca12a1a4 | 347 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 348 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
349 | |
350 | if (sk == NULL) { | |
e41b5368 DL |
351 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
352 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
353 | return; |
354 | } | |
355 | ||
356 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 357 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
358 | return; |
359 | } | |
360 | ||
361 | bh_lock_sock(sk); | |
563d34d0 | 362 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
de0744af | 363 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
364 | |
365 | if (sk->sk_state == TCP_CLOSE) | |
366 | goto out; | |
367 | ||
e802af9c SH |
368 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
369 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
370 | goto out; | |
371 | } | |
372 | ||
1da177e4 | 373 | tp = tcp_sk(sk); |
1ab1457c | 374 | seq = ntohl(th->seq); |
0a672f74 YC |
375 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
376 | fastopen = tp->fastopen_rsk; | |
377 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; | |
1da177e4 | 378 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 379 | !between(seq, snd_una, tp->snd_nxt)) { |
de0744af | 380 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
381 | goto out; |
382 | } | |
383 | ||
384 | np = inet6_sk(sk); | |
385 | ||
ec18d9a2 DM |
386 | if (type == NDISC_REDIRECT) { |
387 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
388 | ||
1ed5c48f | 389 | if (dst) |
6700c270 | 390 | dst->ops->redirect(dst, sk, skb); |
50a75a89 | 391 | goto out; |
ec18d9a2 DM |
392 | } |
393 | ||
1da177e4 | 394 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
395 | /* We are not interested in TCP_LISTEN and open_requests |
396 | * (SYN-ACKs send out by Linux are always <576bytes so | |
397 | * they should go through unfragmented). | |
398 | */ | |
399 | if (sk->sk_state == TCP_LISTEN) | |
400 | goto out; | |
401 | ||
93b36cf3 HFS |
402 | if (!ip6_sk_accept_pmtu(sk)) |
403 | goto out; | |
404 | ||
563d34d0 ED |
405 | tp->mtu_info = ntohl(info); |
406 | if (!sock_owned_by_user(sk)) | |
407 | tcp_v6_mtu_reduced(sk); | |
d013ef2a JA |
408 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
409 | &tp->tsq_flags)) | |
410 | sock_hold(sk); | |
1da177e4 LT |
411 | goto out; |
412 | } | |
413 | ||
414 | icmpv6_err_convert(type, code, &err); | |
415 | ||
60236fdd | 416 | /* Might be for an request_sock */ |
1da177e4 | 417 | switch (sk->sk_state) { |
60236fdd | 418 | struct request_sock *req, **prev; |
1da177e4 LT |
419 | case TCP_LISTEN: |
420 | if (sock_owned_by_user(sk)) | |
421 | goto out; | |
422 | ||
8129765a ACM |
423 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
424 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
425 | if (!req) |
426 | goto out; | |
427 | ||
428 | /* ICMPs are not backlogged, hence we cannot get | |
429 | * an established socket here. | |
430 | */ | |
547b792c | 431 | WARN_ON(req->sk != NULL); |
1da177e4 | 432 | |
2e6599cb | 433 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 434 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
435 | goto out; |
436 | } | |
437 | ||
463c84b9 | 438 | inet_csk_reqsk_queue_drop(sk, req, prev); |
5f1e942c | 439 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
440 | goto out; |
441 | ||
442 | case TCP_SYN_SENT: | |
0a672f74 YC |
443 | case TCP_SYN_RECV: |
444 | /* Only in fast or simultaneous open. If a fast open socket is | |
445 | * is already accepted it is treated as a connected one below. | |
446 | */ | |
447 | if (fastopen && fastopen->sk == NULL) | |
448 | break; | |
449 | ||
1da177e4 | 450 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
451 | sk->sk_err = err; |
452 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
453 | ||
454 | tcp_done(sk); | |
455 | } else | |
456 | sk->sk_err_soft = err; | |
457 | goto out; | |
458 | } | |
459 | ||
460 | if (!sock_owned_by_user(sk) && np->recverr) { | |
461 | sk->sk_err = err; | |
462 | sk->sk_error_report(sk); | |
463 | } else | |
464 | sk->sk_err_soft = err; | |
465 | ||
466 | out: | |
467 | bh_unlock_sock(sk); | |
468 | sock_put(sk); | |
469 | } | |
470 | ||
471 | ||
9f10d3f6 NC |
472 | static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst, |
473 | struct flowi6 *fl6, | |
3840a06e | 474 | struct request_sock *req, |
3a19ce0e DL |
475 | u16 queue_mapping, |
476 | struct tcp_fastopen_cookie *foc) | |
1da177e4 | 477 | { |
634fb979 | 478 | struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 | 479 | struct ipv6_pinfo *np = inet6_sk(sk); |
4c99aa40 | 480 | struct sk_buff *skb; |
9494218f | 481 | int err = -ENOMEM; |
1da177e4 | 482 | |
9f10d3f6 NC |
483 | /* First, grab a route. */ |
484 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL) | |
fd80eb94 | 485 | goto done; |
9494218f | 486 | |
3a19ce0e | 487 | skb = tcp_make_synack(sk, dst, req, foc); |
9494218f | 488 | |
1da177e4 | 489 | if (skb) { |
634fb979 ED |
490 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
491 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 492 | |
634fb979 | 493 | fl6->daddr = ireq->ir_v6_rmt_addr; |
df3687ff FF |
494 | if (np->repflow && (ireq->pktopts != NULL)) |
495 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); | |
496 | ||
fff32699 | 497 | skb_set_queue_mapping(skb, queue_mapping); |
43264e0b | 498 | err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass); |
b9df3cb8 | 499 | err = net_xmit_eval(err); |
1da177e4 LT |
500 | } |
501 | ||
502 | done: | |
1da177e4 LT |
503 | return err; |
504 | } | |
505 | ||
1a2c6181 | 506 | static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req) |
72659ecc | 507 | { |
9f10d3f6 | 508 | struct flowi6 fl6; |
e6c022a4 | 509 | int res; |
9f10d3f6 | 510 | |
3a19ce0e | 511 | res = tcp_v6_send_synack(sk, NULL, &fl6, req, 0, NULL); |
f19c29e3 | 512 | if (!res) { |
e6c022a4 | 513 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); |
f19c29e3 YC |
514 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPSYNRETRANS); |
515 | } | |
e6c022a4 | 516 | return res; |
72659ecc OP |
517 | } |
518 | ||
60236fdd | 519 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 520 | { |
634fb979 | 521 | kfree_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
522 | } |
523 | ||
cfb6eeb4 YH |
524 | #ifdef CONFIG_TCP_MD5SIG |
525 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 526 | const struct in6_addr *addr) |
cfb6eeb4 | 527 | { |
a915da9b | 528 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
529 | } |
530 | ||
531 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
532 | struct sock *addr_sk) | |
533 | { | |
efe4208f | 534 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
cfb6eeb4 YH |
535 | } |
536 | ||
537 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
538 | struct request_sock *req) | |
539 | { | |
634fb979 | 540 | return tcp_v6_md5_do_lookup(sk, &inet_rsk(req)->ir_v6_rmt_addr); |
cfb6eeb4 YH |
541 | } |
542 | ||
4aa956d8 WY |
543 | static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval, |
544 | int optlen) | |
cfb6eeb4 YH |
545 | { |
546 | struct tcp_md5sig cmd; | |
547 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
548 | |
549 | if (optlen < sizeof(cmd)) | |
550 | return -EINVAL; | |
551 | ||
552 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
553 | return -EFAULT; | |
554 | ||
555 | if (sin6->sin6_family != AF_INET6) | |
556 | return -EINVAL; | |
557 | ||
558 | if (!cmd.tcpm_keylen) { | |
e773e4fa | 559 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b ED |
560 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
561 | AF_INET); | |
562 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, | |
563 | AF_INET6); | |
cfb6eeb4 YH |
564 | } |
565 | ||
566 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
567 | return -EINVAL; | |
568 | ||
a915da9b ED |
569 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
570 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
571 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 | 572 | |
a915da9b ED |
573 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
574 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
575 | } |
576 | ||
49a72dfb | 577 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
b71d1d42 ED |
578 | const struct in6_addr *daddr, |
579 | const struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 580 | { |
cfb6eeb4 | 581 | struct tcp6_pseudohdr *bp; |
49a72dfb | 582 | struct scatterlist sg; |
8d26d76d | 583 | |
cfb6eeb4 | 584 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 | 585 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
586 | bp->saddr = *saddr; |
587 | bp->daddr = *daddr; | |
49a72dfb | 588 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 589 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 590 | |
49a72dfb AL |
591 | sg_init_one(&sg, bp, sizeof(*bp)); |
592 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
593 | } | |
c7da57a1 | 594 | |
49a72dfb | 595 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
b71d1d42 | 596 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 597 | const struct tcphdr *th) |
49a72dfb AL |
598 | { |
599 | struct tcp_md5sig_pool *hp; | |
600 | struct hash_desc *desc; | |
601 | ||
602 | hp = tcp_get_md5sig_pool(); | |
603 | if (!hp) | |
604 | goto clear_hash_noput; | |
605 | desc = &hp->md5_desc; | |
606 | ||
607 | if (crypto_hash_init(desc)) | |
608 | goto clear_hash; | |
609 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
610 | goto clear_hash; | |
611 | if (tcp_md5_hash_header(hp, th)) | |
612 | goto clear_hash; | |
613 | if (tcp_md5_hash_key(hp, key)) | |
614 | goto clear_hash; | |
615 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 616 | goto clear_hash; |
cfb6eeb4 | 617 | |
cfb6eeb4 | 618 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 619 | return 0; |
49a72dfb | 620 | |
cfb6eeb4 YH |
621 | clear_hash: |
622 | tcp_put_md5sig_pool(); | |
623 | clear_hash_noput: | |
624 | memset(md5_hash, 0, 16); | |
49a72dfb | 625 | return 1; |
cfb6eeb4 YH |
626 | } |
627 | ||
49a72dfb | 628 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
318cf7aa ED |
629 | const struct sock *sk, |
630 | const struct request_sock *req, | |
631 | const struct sk_buff *skb) | |
cfb6eeb4 | 632 | { |
b71d1d42 | 633 | const struct in6_addr *saddr, *daddr; |
49a72dfb AL |
634 | struct tcp_md5sig_pool *hp; |
635 | struct hash_desc *desc; | |
318cf7aa | 636 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
637 | |
638 | if (sk) { | |
639 | saddr = &inet6_sk(sk)->saddr; | |
efe4208f | 640 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 641 | } else if (req) { |
634fb979 ED |
642 | saddr = &inet_rsk(req)->ir_v6_loc_addr; |
643 | daddr = &inet_rsk(req)->ir_v6_rmt_addr; | |
49a72dfb | 644 | } else { |
b71d1d42 | 645 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
646 | saddr = &ip6h->saddr; |
647 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 648 | } |
49a72dfb AL |
649 | |
650 | hp = tcp_get_md5sig_pool(); | |
651 | if (!hp) | |
652 | goto clear_hash_noput; | |
653 | desc = &hp->md5_desc; | |
654 | ||
655 | if (crypto_hash_init(desc)) | |
656 | goto clear_hash; | |
657 | ||
658 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
659 | goto clear_hash; | |
660 | if (tcp_md5_hash_header(hp, th)) | |
661 | goto clear_hash; | |
662 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
663 | goto clear_hash; | |
664 | if (tcp_md5_hash_key(hp, key)) | |
665 | goto clear_hash; | |
666 | if (crypto_hash_final(desc, md5_hash)) | |
667 | goto clear_hash; | |
668 | ||
669 | tcp_put_md5sig_pool(); | |
670 | return 0; | |
671 | ||
672 | clear_hash: | |
673 | tcp_put_md5sig_pool(); | |
674 | clear_hash_noput: | |
675 | memset(md5_hash, 0, 16); | |
676 | return 1; | |
cfb6eeb4 YH |
677 | } |
678 | ||
318cf7aa | 679 | static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
cfb6eeb4 | 680 | { |
cf533ea5 | 681 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 682 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 683 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 684 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 685 | int genhash; |
cfb6eeb4 YH |
686 | u8 newhash[16]; |
687 | ||
688 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 689 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 690 | |
785957d3 DM |
691 | /* We've parsed the options - do we have a hash? */ |
692 | if (!hash_expected && !hash_location) | |
693 | return 0; | |
694 | ||
695 | if (hash_expected && !hash_location) { | |
696 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
697 | return 1; |
698 | } | |
699 | ||
785957d3 DM |
700 | if (!hash_expected && hash_location) { |
701 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
702 | return 1; |
703 | } | |
704 | ||
705 | /* check the signature */ | |
49a72dfb AL |
706 | genhash = tcp_v6_md5_hash_skb(newhash, |
707 | hash_expected, | |
708 | NULL, NULL, skb); | |
709 | ||
cfb6eeb4 | 710 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
e87cc472 JP |
711 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
712 | genhash ? "failed" : "mismatch", | |
713 | &ip6h->saddr, ntohs(th->source), | |
714 | &ip6h->daddr, ntohs(th->dest)); | |
cfb6eeb4 YH |
715 | return 1; |
716 | } | |
717 | return 0; | |
718 | } | |
719 | #endif | |
720 | ||
c6aefafb | 721 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 722 | .family = AF_INET6, |
2e6599cb | 723 | .obj_size = sizeof(struct tcp6_request_sock), |
72659ecc | 724 | .rtx_syn_ack = tcp_v6_rtx_synack, |
60236fdd ACM |
725 | .send_ack = tcp_v6_reqsk_send_ack, |
726 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 727 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 728 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
729 | }; |
730 | ||
cfb6eeb4 | 731 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 732 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 733 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 734 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 735 | }; |
b6332e6c | 736 | #endif |
cfb6eeb4 | 737 | |
626e264d | 738 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
9c76a114 | 739 | u32 tsval, u32 tsecr, int oif, |
1d13a96c FF |
740 | struct tcp_md5sig_key *key, int rst, u8 tclass, |
741 | u32 label) | |
1da177e4 | 742 | { |
cf533ea5 ED |
743 | const struct tcphdr *th = tcp_hdr(skb); |
744 | struct tcphdr *t1; | |
1da177e4 | 745 | struct sk_buff *buff; |
4c9483b2 | 746 | struct flowi6 fl6; |
adf30907 | 747 | struct net *net = dev_net(skb_dst(skb)->dev); |
e5047992 | 748 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 749 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 750 | struct dst_entry *dst; |
81ada62d | 751 | __be32 *topt; |
1da177e4 | 752 | |
ee684b6f | 753 | if (tsecr) |
626e264d | 754 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 755 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
756 | if (key) |
757 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
758 | #endif | |
759 | ||
cfb6eeb4 | 760 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 761 | GFP_ATOMIC); |
1ab1457c YH |
762 | if (buff == NULL) |
763 | return; | |
1da177e4 | 764 | |
cfb6eeb4 | 765 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 766 | |
cfb6eeb4 | 767 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 768 | skb_reset_transport_header(buff); |
1da177e4 LT |
769 | |
770 | /* Swap the send and the receive. */ | |
771 | memset(t1, 0, sizeof(*t1)); | |
772 | t1->dest = th->source; | |
773 | t1->source = th->dest; | |
cfb6eeb4 | 774 | t1->doff = tot_len / 4; |
626e264d IJ |
775 | t1->seq = htonl(seq); |
776 | t1->ack_seq = htonl(ack); | |
777 | t1->ack = !rst || !th->ack; | |
778 | t1->rst = rst; | |
779 | t1->window = htons(win); | |
1da177e4 | 780 | |
81ada62d IJ |
781 | topt = (__be32 *)(t1 + 1); |
782 | ||
ee684b6f | 783 | if (tsecr) { |
626e264d IJ |
784 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
785 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
786 | *topt++ = htonl(tsval); |
787 | *topt++ = htonl(tsecr); | |
626e264d IJ |
788 | } |
789 | ||
cfb6eeb4 YH |
790 | #ifdef CONFIG_TCP_MD5SIG |
791 | if (key) { | |
81ada62d IJ |
792 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
793 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
794 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
795 | &ipv6_hdr(skb)->saddr, |
796 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
797 | } |
798 | #endif | |
799 | ||
4c9483b2 | 800 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
801 | fl6.daddr = ipv6_hdr(skb)->saddr; |
802 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 803 | fl6.flowlabel = label; |
1da177e4 | 804 | |
e5700aff DM |
805 | buff->ip_summed = CHECKSUM_PARTIAL; |
806 | buff->csum = 0; | |
807 | ||
4c9483b2 | 808 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 809 | |
4c9483b2 | 810 | fl6.flowi6_proto = IPPROTO_TCP; |
a36dbdb2 | 811 | if (rt6_need_strict(&fl6.daddr) && !oif) |
4c675258 | 812 | fl6.flowi6_oif = inet6_iif(skb); |
9c76a114 WY |
813 | else |
814 | fl6.flowi6_oif = oif; | |
e110861f | 815 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark); |
1958b856 DM |
816 | fl6.fl6_dport = t1->dest; |
817 | fl6.fl6_sport = t1->source; | |
4c9483b2 | 818 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 819 | |
c20121ae DL |
820 | /* Pass a socket to ip6_dst_lookup either it is for RST |
821 | * Underlying function will use this to retrieve the network | |
822 | * namespace | |
823 | */ | |
0e0d44ab | 824 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
825 | if (!IS_ERR(dst)) { |
826 | skb_dst_set(buff, dst); | |
b903d324 | 827 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
68d0c6d3 DM |
828 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
829 | if (rst) | |
830 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
831 | return; | |
1da177e4 LT |
832 | } |
833 | ||
834 | kfree_skb(buff); | |
835 | } | |
836 | ||
626e264d | 837 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 838 | { |
cf533ea5 | 839 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 840 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 841 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
842 | #ifdef CONFIG_TCP_MD5SIG |
843 | const __u8 *hash_location = NULL; | |
844 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
845 | unsigned char newhash[16]; | |
846 | int genhash; | |
847 | struct sock *sk1 = NULL; | |
848 | #endif | |
9c76a114 | 849 | int oif; |
1da177e4 | 850 | |
626e264d | 851 | if (th->rst) |
1da177e4 LT |
852 | return; |
853 | ||
626e264d IJ |
854 | if (!ipv6_unicast_destination(skb)) |
855 | return; | |
1da177e4 | 856 | |
cfb6eeb4 | 857 | #ifdef CONFIG_TCP_MD5SIG |
658ddaaf SL |
858 | hash_location = tcp_parse_md5sig_option(th); |
859 | if (!sk && hash_location) { | |
860 | /* | |
861 | * active side is lost. Try to find listening socket through | |
862 | * source port, and then find md5 key through listening socket. | |
863 | * we are not loose security here: | |
864 | * Incoming packet is checked with md5 hash with finding key, | |
865 | * no RST generated if md5 hash doesn't match. | |
866 | */ | |
867 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
5ba24953 TH |
868 | &tcp_hashinfo, &ipv6h->saddr, |
869 | th->source, &ipv6h->daddr, | |
658ddaaf SL |
870 | ntohs(th->source), inet6_iif(skb)); |
871 | if (!sk1) | |
872 | return; | |
873 | ||
874 | rcu_read_lock(); | |
875 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); | |
876 | if (!key) | |
877 | goto release_sk1; | |
878 | ||
879 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb); | |
880 | if (genhash || memcmp(hash_location, newhash, 16) != 0) | |
881 | goto release_sk1; | |
882 | } else { | |
883 | key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; | |
884 | } | |
cfb6eeb4 YH |
885 | #endif |
886 | ||
626e264d IJ |
887 | if (th->ack) |
888 | seq = ntohl(th->ack_seq); | |
889 | else | |
890 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
891 | (th->doff << 2); | |
1da177e4 | 892 | |
9c76a114 WY |
893 | oif = sk ? sk->sk_bound_dev_if : 0; |
894 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0); | |
658ddaaf SL |
895 | |
896 | #ifdef CONFIG_TCP_MD5SIG | |
897 | release_sk1: | |
898 | if (sk1) { | |
899 | rcu_read_unlock(); | |
900 | sock_put(sk1); | |
901 | } | |
902 | #endif | |
626e264d | 903 | } |
1da177e4 | 904 | |
ee684b6f | 905 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, |
9c76a114 | 906 | u32 win, u32 tsval, u32 tsecr, int oif, |
1d13a96c FF |
907 | struct tcp_md5sig_key *key, u8 tclass, |
908 | u32 label) | |
626e264d | 909 | { |
9c76a114 | 910 | tcp_v6_send_response(skb, seq, ack, win, tsval, tsecr, oif, key, 0, tclass, |
1d13a96c | 911 | label); |
1da177e4 LT |
912 | } |
913 | ||
914 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
915 | { | |
8feaf0c0 | 916 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 917 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 918 | |
9501f972 | 919 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 920 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
ee684b6f | 921 | tcp_time_stamp + tcptw->tw_ts_offset, |
9c76a114 | 922 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
1d13a96c | 923 | tw->tw_tclass, (tw->tw_flowlabel << 12)); |
1da177e4 | 924 | |
8feaf0c0 | 925 | inet_twsk_put(tw); |
1da177e4 LT |
926 | } |
927 | ||
6edafaaf GJ |
928 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
929 | struct request_sock *req) | |
1da177e4 | 930 | { |
3a19ce0e DL |
931 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
932 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
933 | */ | |
934 | tcp_v6_send_ack(skb, (sk->sk_state == TCP_LISTEN) ? | |
935 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, | |
936 | tcp_rsk(req)->rcv_nxt, | |
9c76a114 | 937 | req->rcv_wnd, tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if, |
1d13a96c FF |
938 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), |
939 | 0, 0); | |
1da177e4 LT |
940 | } |
941 | ||
942 | ||
4c99aa40 | 943 | static struct sock *tcp_v6_hnd_req(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 944 | { |
60236fdd | 945 | struct request_sock *req, **prev; |
aa8223c7 | 946 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
947 | struct sock *nsk; |
948 | ||
949 | /* Find possible connection requests. */ | |
8129765a | 950 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
951 | &ipv6_hdr(skb)->saddr, |
952 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 | 953 | if (req) |
8336886f | 954 | return tcp_check_req(sk, skb, req, prev, false); |
1da177e4 | 955 | |
3b1e0a65 | 956 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
957 | &ipv6_hdr(skb)->saddr, th->source, |
958 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
959 | |
960 | if (nsk) { | |
961 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
962 | bh_lock_sock(nsk); | |
963 | return nsk; | |
964 | } | |
9469c7b4 | 965 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
966 | return NULL; |
967 | } | |
968 | ||
c6aefafb | 969 | #ifdef CONFIG_SYN_COOKIES |
af9b4738 | 970 | if (!th->syn) |
c6aefafb | 971 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
972 | #endif |
973 | return sk; | |
974 | } | |
975 | ||
1da177e4 LT |
976 | /* FIXME: this is substantially similar to the ipv4 code. |
977 | * Can some kind of merge be done? -- erics | |
978 | */ | |
979 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
980 | { | |
e6b4d113 WAS |
981 | struct tcp_options_received tmp_opt; |
982 | struct request_sock *req; | |
634fb979 | 983 | struct inet_request_sock *ireq; |
1da177e4 | 984 | struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 | 985 | struct tcp_sock *tp = tcp_sk(sk); |
e6b4d113 | 986 | __u32 isn = TCP_SKB_CB(skb)->when; |
493f377d | 987 | struct dst_entry *dst = NULL; |
3a19ce0e DL |
988 | struct tcp_fastopen_cookie foc = { .len = -1 }; |
989 | bool want_cookie = false, fastopen; | |
3840a06e | 990 | struct flowi6 fl6; |
3a19ce0e | 991 | int err; |
1da177e4 LT |
992 | |
993 | if (skb->protocol == htons(ETH_P_IP)) | |
994 | return tcp_v4_conn_request(sk, skb); | |
995 | ||
996 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 997 | goto drop; |
1da177e4 | 998 | |
5ad37d5d HFS |
999 | if ((sysctl_tcp_syncookies == 2 || |
1000 | inet_csk_reqsk_queue_is_full(sk)) && !isn) { | |
946cedcc ED |
1001 | want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6"); |
1002 | if (!want_cookie) | |
1003 | goto drop; | |
1da177e4 LT |
1004 | } |
1005 | ||
5f1e942c VS |
1006 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) { |
1007 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); | |
1da177e4 | 1008 | goto drop; |
5f1e942c | 1009 | } |
1da177e4 | 1010 | |
ca304b61 | 1011 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1012 | if (req == NULL) |
1013 | goto drop; | |
1014 | ||
cfb6eeb4 YH |
1015 | #ifdef CONFIG_TCP_MD5SIG |
1016 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
1017 | #endif | |
1018 | ||
1da177e4 LT |
1019 | tcp_clear_options(&tmp_opt); |
1020 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1021 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
3a19ce0e | 1022 | tcp_parse_options(skb, &tmp_opt, 0, want_cookie ? NULL : &foc); |
1da177e4 | 1023 | |
4dfc2817 | 1024 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 1025 | tcp_clear_options(&tmp_opt); |
c6aefafb | 1026 | |
1da177e4 LT |
1027 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1028 | tcp_openreq_init(req, &tmp_opt, skb); | |
1029 | ||
634fb979 ED |
1030 | ireq = inet_rsk(req); |
1031 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
1032 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
172d69e6 | 1033 | if (!want_cookie || tmp_opt.tstamp_ok) |
5d134f1c | 1034 | TCP_ECN_create_request(req, skb, sock_net(sk)); |
c6aefafb | 1035 | |
634fb979 | 1036 | ireq->ir_iif = sk->sk_bound_dev_if; |
84f39b08 | 1037 | ireq->ir_mark = inet_request_mark(sk, skb); |
4d0fe50c ED |
1038 | |
1039 | /* So that link locals have meaning */ | |
1040 | if (!sk->sk_bound_dev_if && | |
634fb979 ED |
1041 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
1042 | ireq->ir_iif = inet6_iif(skb); | |
4d0fe50c | 1043 | |
2bbdf389 | 1044 | if (!isn) { |
c6aefafb GG |
1045 | if (ipv6_opt_accepted(sk, skb) || |
1046 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
df3687ff FF |
1047 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim || |
1048 | np->repflow) { | |
c6aefafb | 1049 | atomic_inc(&skb->users); |
634fb979 | 1050 | ireq->pktopts = skb; |
c6aefafb | 1051 | } |
493f377d DM |
1052 | |
1053 | if (want_cookie) { | |
2bbdf389 FW |
1054 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); |
1055 | req->cookie_ts = tmp_opt.tstamp_ok; | |
493f377d DM |
1056 | goto have_isn; |
1057 | } | |
1058 | ||
1059 | /* VJ's idea. We save last timestamp seen | |
1060 | * from the destination in peer table, when entering | |
1061 | * state TIME-WAIT, and check against it before | |
1062 | * accepting new connection request. | |
1063 | * | |
1064 | * If "isn" is not zero, this request hit alive | |
1065 | * timewait bucket, so that all the necessary checks | |
1066 | * are made in the function processing timewait state. | |
1067 | */ | |
1068 | if (tmp_opt.saw_tstamp && | |
1069 | tcp_death_row.sysctl_tw_recycle && | |
81166dd6 DM |
1070 | (dst = inet6_csk_route_req(sk, &fl6, req)) != NULL) { |
1071 | if (!tcp_peer_is_proven(req, dst, true)) { | |
493f377d DM |
1072 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); |
1073 | goto drop_and_release; | |
1074 | } | |
1075 | } | |
1076 | /* Kill the following clause, if you dislike this way. */ | |
1077 | else if (!sysctl_tcp_syncookies && | |
1078 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < | |
1079 | (sysctl_max_syn_backlog >> 2)) && | |
81166dd6 | 1080 | !tcp_peer_is_proven(req, dst, false)) { |
493f377d DM |
1081 | /* Without syncookies last quarter of |
1082 | * backlog is filled with destinations, | |
1083 | * proven to be alive. | |
1084 | * It means that we continue to communicate | |
1085 | * to destinations, already remembered | |
1086 | * to the moment of synflood. | |
1087 | */ | |
1088 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n", | |
634fb979 | 1089 | &ireq->ir_v6_rmt_addr, ntohs(tcp_hdr(skb)->source)); |
493f377d | 1090 | goto drop_and_release; |
2bbdf389 | 1091 | } |
493f377d DM |
1092 | |
1093 | isn = tcp_v6_init_sequence(skb); | |
c6aefafb | 1094 | } |
493f377d | 1095 | have_isn: |
1da177e4 | 1096 | |
437c5b53 NC |
1097 | if (security_inet_conn_request(sk, skb, req)) |
1098 | goto drop_and_release; | |
4237c75c | 1099 | |
3a19ce0e | 1100 | if (!dst && (dst = inet6_csk_route_req(sk, &fl6, req)) == NULL) |
e6b4d113 | 1101 | goto drop_and_free; |
1da177e4 | 1102 | |
3a19ce0e | 1103 | tcp_rsk(req)->snt_isn = isn; |
016818d0 | 1104 | tcp_rsk(req)->snt_synack = tcp_time_stamp; |
3a19ce0e DL |
1105 | tcp_openreq_init_rwin(req, sk, dst); |
1106 | fastopen = !want_cookie && | |
1107 | tcp_try_fastopen(sk, skb, req, &foc, dst); | |
1108 | err = tcp_v6_send_synack(sk, dst, &fl6, req, | |
1109 | skb_get_queue_mapping(skb), &foc); | |
1110 | if (!fastopen) { | |
1111 | if (err || want_cookie) | |
1112 | goto drop_and_free; | |
1113 | ||
1114 | tcp_rsk(req)->listener = NULL; | |
1115 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); | |
1116 | } | |
e6b4d113 | 1117 | return 0; |
1da177e4 | 1118 | |
493f377d DM |
1119 | drop_and_release: |
1120 | dst_release(dst); | |
e6b4d113 WAS |
1121 | drop_and_free: |
1122 | reqsk_free(req); | |
1da177e4 | 1123 | drop: |
5f1e942c | 1124 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1125 | return 0; /* don't send reset */ |
1126 | } | |
1127 | ||
4c99aa40 WC |
1128 | static struct sock *tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, |
1129 | struct request_sock *req, | |
1130 | struct dst_entry *dst) | |
1da177e4 | 1131 | { |
634fb979 | 1132 | struct inet_request_sock *ireq; |
1da177e4 LT |
1133 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1134 | struct tcp6_sock *newtcp6sk; | |
1135 | struct inet_sock *newinet; | |
1136 | struct tcp_sock *newtp; | |
1137 | struct sock *newsk; | |
cfb6eeb4 YH |
1138 | #ifdef CONFIG_TCP_MD5SIG |
1139 | struct tcp_md5sig_key *key; | |
1140 | #endif | |
3840a06e | 1141 | struct flowi6 fl6; |
1da177e4 LT |
1142 | |
1143 | if (skb->protocol == htons(ETH_P_IP)) { | |
1144 | /* | |
1145 | * v6 mapped | |
1146 | */ | |
1147 | ||
1148 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1149 | ||
1ab1457c | 1150 | if (newsk == NULL) |
1da177e4 LT |
1151 | return NULL; |
1152 | ||
1153 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1154 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1155 | ||
1156 | newinet = inet_sk(newsk); | |
1157 | newnp = inet6_sk(newsk); | |
1158 | newtp = tcp_sk(newsk); | |
1159 | ||
1160 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1161 | ||
efe4208f | 1162 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newsk->sk_v6_daddr); |
1da177e4 | 1163 | |
c720c7e8 | 1164 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 | 1165 | |
efe4208f | 1166 | newsk->sk_v6_rcv_saddr = newnp->saddr; |
1da177e4 | 1167 | |
8292a17a | 1168 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1169 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1170 | #ifdef CONFIG_TCP_MD5SIG |
1171 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1172 | #endif | |
1173 | ||
676a1184 YZ |
1174 | newnp->ipv6_ac_list = NULL; |
1175 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1176 | newnp->pktoptions = NULL; |
1177 | newnp->opt = NULL; | |
505cbfc5 | 1178 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1179 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1180 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1181 | if (np->repflow) |
1182 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 | 1183 | |
e6848976 ACM |
1184 | /* |
1185 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1186 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1187 | * that function for the gory details. -acme | |
1da177e4 | 1188 | */ |
1da177e4 LT |
1189 | |
1190 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1191 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1192 | Sync it now. |
1193 | */ | |
d83d8461 | 1194 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1195 | |
1196 | return newsk; | |
1197 | } | |
1198 | ||
634fb979 | 1199 | ireq = inet_rsk(req); |
1da177e4 LT |
1200 | |
1201 | if (sk_acceptq_is_full(sk)) | |
1202 | goto out_overflow; | |
1203 | ||
493f377d | 1204 | if (!dst) { |
3840a06e | 1205 | dst = inet6_csk_route_req(sk, &fl6, req); |
493f377d | 1206 | if (!dst) |
1da177e4 | 1207 | goto out; |
1ab1457c | 1208 | } |
1da177e4 LT |
1209 | |
1210 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1211 | if (newsk == NULL) | |
093d2823 | 1212 | goto out_nonewsk; |
1da177e4 | 1213 | |
e6848976 ACM |
1214 | /* |
1215 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1216 | * count here, tcp_create_openreq_child now does this for us, see the | |
1217 | * comment in that function for the gory details. -acme | |
1218 | */ | |
1da177e4 | 1219 | |
59eed279 | 1220 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1221 | __ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1222 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1223 | |
1224 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1225 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1226 | ||
1227 | newtp = tcp_sk(newsk); | |
1228 | newinet = inet_sk(newsk); | |
1229 | newnp = inet6_sk(newsk); | |
1230 | ||
1231 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1232 | ||
634fb979 ED |
1233 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1234 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1235 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1236 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1237 | |
1ab1457c | 1238 | /* Now IPv6 options... |
1da177e4 LT |
1239 | |
1240 | First: no IPv4 options. | |
1241 | */ | |
f6d8bd05 | 1242 | newinet->inet_opt = NULL; |
676a1184 | 1243 | newnp->ipv6_ac_list = NULL; |
d35690be | 1244 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1245 | |
1246 | /* Clone RX bits */ | |
1247 | newnp->rxopt.all = np->rxopt.all; | |
1248 | ||
1249 | /* Clone pktoptions received with SYN */ | |
1250 | newnp->pktoptions = NULL; | |
634fb979 ED |
1251 | if (ireq->pktopts != NULL) { |
1252 | newnp->pktoptions = skb_clone(ireq->pktopts, | |
99a1dec7 | 1253 | sk_gfp_atomic(sk, GFP_ATOMIC)); |
634fb979 ED |
1254 | consume_skb(ireq->pktopts); |
1255 | ireq->pktopts = NULL; | |
1da177e4 LT |
1256 | if (newnp->pktoptions) |
1257 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1258 | } | |
1259 | newnp->opt = NULL; | |
505cbfc5 | 1260 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1261 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1262 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1263 | if (np->repflow) |
1264 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 LT |
1265 | |
1266 | /* Clone native IPv6 options from listening socket (if any) | |
1267 | ||
1268 | Yes, keeping reference count would be much more clever, | |
1269 | but we make one more one thing there: reattach optmem | |
1270 | to newsk. | |
1271 | */ | |
43264e0b RL |
1272 | if (np->opt) |
1273 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
1da177e4 | 1274 | |
d83d8461 | 1275 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1276 | if (newnp->opt) |
d83d8461 ACM |
1277 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1278 | newnp->opt->opt_flen); | |
1da177e4 LT |
1279 | |
1280 | tcp_sync_mss(newsk, dst_mtu(dst)); | |
0dbaee3b | 1281 | newtp->advmss = dst_metric_advmss(dst); |
d135c522 NC |
1282 | if (tcp_sk(sk)->rx_opt.user_mss && |
1283 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1284 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1285 | ||
1da177e4 LT |
1286 | tcp_initialize_rcv_mss(newsk); |
1287 | ||
c720c7e8 ED |
1288 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1289 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1290 | |
cfb6eeb4 YH |
1291 | #ifdef CONFIG_TCP_MD5SIG |
1292 | /* Copy over the MD5 key from the original socket */ | |
4aa956d8 WY |
1293 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr); |
1294 | if (key != NULL) { | |
cfb6eeb4 YH |
1295 | /* We're using one, so create a matching key |
1296 | * on the newsk structure. If we fail to get | |
1297 | * memory, then we end up not copying the key | |
1298 | * across. Shucks. | |
1299 | */ | |
efe4208f | 1300 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
99a1dec7 MG |
1301 | AF_INET6, key->key, key->keylen, |
1302 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
cfb6eeb4 YH |
1303 | } |
1304 | #endif | |
1305 | ||
093d2823 | 1306 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1307 | inet_csk_prepare_forced_close(newsk); |
1308 | tcp_done(newsk); | |
093d2823 BS |
1309 | goto out; |
1310 | } | |
9327f705 | 1311 | __inet6_hash(newsk, NULL); |
1da177e4 LT |
1312 | |
1313 | return newsk; | |
1314 | ||
1315 | out_overflow: | |
de0744af | 1316 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1317 | out_nonewsk: |
1da177e4 | 1318 | dst_release(dst); |
093d2823 BS |
1319 | out: |
1320 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); | |
1da177e4 LT |
1321 | return NULL; |
1322 | } | |
1323 | ||
1da177e4 LT |
1324 | /* The socket must have it's spinlock held when we get |
1325 | * here. | |
1326 | * | |
1327 | * We have a potential double-lock case here, so even when | |
1328 | * doing backlog processing we use the BH locking scheme. | |
1329 | * This is because we cannot sleep with the original spinlock | |
1330 | * held. | |
1331 | */ | |
1332 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1333 | { | |
1334 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1335 | struct tcp_sock *tp; | |
1336 | struct sk_buff *opt_skb = NULL; | |
1337 | ||
1338 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1339 | goes to IPv4 receive handler and backlogged. | |
1340 | From backlog it always goes here. Kerboom... | |
1341 | Fortunately, tcp_rcv_established and rcv_established | |
1342 | handle them correctly, but it is not case with | |
1343 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1344 | */ | |
1345 | ||
1346 | if (skb->protocol == htons(ETH_P_IP)) | |
1347 | return tcp_v4_do_rcv(sk, skb); | |
1348 | ||
cfb6eeb4 | 1349 | #ifdef CONFIG_TCP_MD5SIG |
4aa956d8 | 1350 | if (tcp_v6_inbound_md5_hash(sk, skb)) |
cfb6eeb4 YH |
1351 | goto discard; |
1352 | #endif | |
1353 | ||
fda9ef5d | 1354 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1355 | goto discard; |
1356 | ||
1357 | /* | |
1358 | * socket locking is here for SMP purposes as backlog rcv | |
1359 | * is currently called with bh processing disabled. | |
1360 | */ | |
1361 | ||
1362 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1363 | ||
1364 | Yes, guys, it is the only place in our code, where we | |
1365 | may make it not affecting IPv4. | |
1366 | The rest of code is protocol independent, | |
1367 | and I do not like idea to uglify IPv4. | |
1368 | ||
1369 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1370 | looks not very well thought. For now we latch | |
1371 | options, received in the last packet, enqueued | |
1372 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1373 | --ANK (980728) |
1da177e4 LT |
1374 | */ |
1375 | if (np->rxopt.all) | |
99a1dec7 | 1376 | opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC)); |
1da177e4 LT |
1377 | |
1378 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1379 | struct dst_entry *dst = sk->sk_rx_dst; |
1380 | ||
bdeab991 | 1381 | sock_rps_save_rxhash(sk, skb); |
5d299f3d ED |
1382 | if (dst) { |
1383 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1384 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1385 | dst_release(dst); | |
1386 | sk->sk_rx_dst = NULL; | |
1387 | } | |
1388 | } | |
1389 | ||
c995ae22 | 1390 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
1da177e4 LT |
1391 | if (opt_skb) |
1392 | goto ipv6_pktoptions; | |
1393 | return 0; | |
1394 | } | |
1395 | ||
ab6a5bb6 | 1396 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1397 | goto csum_err; |
1398 | ||
1ab1457c | 1399 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1400 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1401 | if (!nsk) | |
1402 | goto discard; | |
1403 | ||
1404 | /* | |
1405 | * Queue it on the new socket if the new socket is active, | |
1406 | * otherwise we just shortcircuit this and continue with | |
1407 | * the new socket.. | |
1408 | */ | |
4c99aa40 | 1409 | if (nsk != sk) { |
bdeab991 | 1410 | sock_rps_save_rxhash(nsk, skb); |
1da177e4 LT |
1411 | if (tcp_child_process(sk, nsk, skb)) |
1412 | goto reset; | |
1413 | if (opt_skb) | |
1414 | __kfree_skb(opt_skb); | |
1415 | return 0; | |
1416 | } | |
47482f13 | 1417 | } else |
bdeab991 | 1418 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1419 | |
aa8223c7 | 1420 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1421 | goto reset; |
1da177e4 LT |
1422 | if (opt_skb) |
1423 | goto ipv6_pktoptions; | |
1424 | return 0; | |
1425 | ||
1426 | reset: | |
cfb6eeb4 | 1427 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1428 | discard: |
1429 | if (opt_skb) | |
1430 | __kfree_skb(opt_skb); | |
1431 | kfree_skb(skb); | |
1432 | return 0; | |
1433 | csum_err: | |
6a5dc9e5 | 1434 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); |
63231bdd | 1435 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1436 | goto discard; |
1437 | ||
1438 | ||
1439 | ipv6_pktoptions: | |
1440 | /* Do you ask, what is it? | |
1441 | ||
1442 | 1. skb was enqueued by tcp. | |
1443 | 2. skb is added to tail of read queue, rather than out of order. | |
1444 | 3. socket is not in passive state. | |
1445 | 4. Finally, it really contains options, which user wants to receive. | |
1446 | */ | |
1447 | tp = tcp_sk(sk); | |
1448 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1449 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1450 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1451 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1452 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1453 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
82e9f105 | 1454 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1455 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
df3687ff FF |
1456 | if (np->repflow) |
1457 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
1da177e4 LT |
1458 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1459 | skb_set_owner_r(opt_skb, sk); | |
1460 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1461 | } else { | |
1462 | __kfree_skb(opt_skb); | |
1463 | opt_skb = xchg(&np->pktoptions, NULL); | |
1464 | } | |
1465 | } | |
1466 | ||
800d55f1 | 1467 | kfree_skb(opt_skb); |
1da177e4 LT |
1468 | return 0; |
1469 | } | |
1470 | ||
e5bbef20 | 1471 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1472 | { |
cf533ea5 | 1473 | const struct tcphdr *th; |
b71d1d42 | 1474 | const struct ipv6hdr *hdr; |
1da177e4 LT |
1475 | struct sock *sk; |
1476 | int ret; | |
a86b1e30 | 1477 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1478 | |
1479 | if (skb->pkt_type != PACKET_HOST) | |
1480 | goto discard_it; | |
1481 | ||
1482 | /* | |
1483 | * Count it even if it's bad. | |
1484 | */ | |
63231bdd | 1485 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1486 | |
1487 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1488 | goto discard_it; | |
1489 | ||
aa8223c7 | 1490 | th = tcp_hdr(skb); |
1da177e4 LT |
1491 | |
1492 | if (th->doff < sizeof(struct tcphdr)/4) | |
1493 | goto bad_packet; | |
1494 | if (!pskb_may_pull(skb, th->doff*4)) | |
1495 | goto discard_it; | |
1496 | ||
e4f45b7f | 1497 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
6a5dc9e5 | 1498 | goto csum_error; |
1da177e4 | 1499 | |
aa8223c7 | 1500 | th = tcp_hdr(skb); |
e802af9c | 1501 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
1502 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1503 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1504 | skb->len - th->doff*4); | |
1505 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1506 | TCP_SKB_CB(skb)->when = 0; | |
b82d1bb4 | 1507 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); |
1da177e4 LT |
1508 | TCP_SKB_CB(skb)->sacked = 0; |
1509 | ||
9a1f27c4 | 1510 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1511 | if (!sk) |
1512 | goto no_tcp_socket; | |
1513 | ||
1514 | process: | |
1515 | if (sk->sk_state == TCP_TIME_WAIT) | |
1516 | goto do_time_wait; | |
1517 | ||
e802af9c SH |
1518 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1519 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1520 | goto discard_and_relse; | |
1521 | } | |
1522 | ||
1da177e4 LT |
1523 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1524 | goto discard_and_relse; | |
1525 | ||
fda9ef5d | 1526 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1527 | goto discard_and_relse; |
1528 | ||
8b80cda5 | 1529 | sk_mark_napi_id(sk, skb); |
1da177e4 LT |
1530 | skb->dev = NULL; |
1531 | ||
293b9c42 | 1532 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1533 | ret = 0; |
1534 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1535 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1536 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a | 1537 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
a2bd1140 | 1538 | tp->ucopy.dma_chan = net_dma_find_channel(); |
1ab1457c YH |
1539 | if (tp->ucopy.dma_chan) |
1540 | ret = tcp_v6_do_rcv(sk, skb); | |
1541 | else | |
1a2449a8 CL |
1542 | #endif |
1543 | { | |
1544 | if (!tcp_prequeue(sk, skb)) | |
1545 | ret = tcp_v6_do_rcv(sk, skb); | |
1546 | } | |
da882c1f ED |
1547 | } else if (unlikely(sk_add_backlog(sk, skb, |
1548 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1549 | bh_unlock_sock(sk); |
6cce09f8 | 1550 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1551 | goto discard_and_relse; |
1552 | } | |
1da177e4 LT |
1553 | bh_unlock_sock(sk); |
1554 | ||
1555 | sock_put(sk); | |
1556 | return ret ? -1 : 0; | |
1557 | ||
1558 | no_tcp_socket: | |
1559 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1560 | goto discard_it; | |
1561 | ||
1562 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
6a5dc9e5 ED |
1563 | csum_error: |
1564 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); | |
1da177e4 | 1565 | bad_packet: |
63231bdd | 1566 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1567 | } else { |
cfb6eeb4 | 1568 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1569 | } |
1570 | ||
1571 | discard_it: | |
1da177e4 LT |
1572 | kfree_skb(skb); |
1573 | return 0; | |
1574 | ||
1575 | discard_and_relse: | |
1576 | sock_put(sk); | |
1577 | goto discard_it; | |
1578 | ||
1579 | do_time_wait: | |
1580 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1581 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1582 | goto discard_it; |
1583 | } | |
1584 | ||
6a5dc9e5 | 1585 | if (skb->len < (th->doff<<2)) { |
9469c7b4 | 1586 | inet_twsk_put(inet_twsk(sk)); |
6a5dc9e5 ED |
1587 | goto bad_packet; |
1588 | } | |
1589 | if (tcp_checksum_complete(skb)) { | |
1590 | inet_twsk_put(inet_twsk(sk)); | |
1591 | goto csum_error; | |
1da177e4 LT |
1592 | } |
1593 | ||
9469c7b4 | 1594 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1595 | case TCP_TW_SYN: |
1596 | { | |
1597 | struct sock *sk2; | |
1598 | ||
c346dca1 | 1599 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
5ba24953 | 1600 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1601 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1602 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1603 | if (sk2 != NULL) { |
295ff7ed ACM |
1604 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1605 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1606 | inet_twsk_put(tw); | |
1da177e4 LT |
1607 | sk = sk2; |
1608 | goto process; | |
1609 | } | |
1610 | /* Fall through to ACK */ | |
1611 | } | |
1612 | case TCP_TW_ACK: | |
1613 | tcp_v6_timewait_ack(sk, skb); | |
1614 | break; | |
1615 | case TCP_TW_RST: | |
1616 | goto no_tcp_socket; | |
4aa956d8 WY |
1617 | case TCP_TW_SUCCESS: |
1618 | ; | |
1da177e4 LT |
1619 | } |
1620 | goto discard_it; | |
1621 | } | |
1622 | ||
c7109986 ED |
1623 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1624 | { | |
1625 | const struct ipv6hdr *hdr; | |
1626 | const struct tcphdr *th; | |
1627 | struct sock *sk; | |
1628 | ||
1629 | if (skb->pkt_type != PACKET_HOST) | |
1630 | return; | |
1631 | ||
1632 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1633 | return; | |
1634 | ||
1635 | hdr = ipv6_hdr(skb); | |
1636 | th = tcp_hdr(skb); | |
1637 | ||
1638 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1639 | return; | |
1640 | ||
1641 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, | |
1642 | &hdr->saddr, th->source, | |
1643 | &hdr->daddr, ntohs(th->dest), | |
1644 | inet6_iif(skb)); | |
1645 | if (sk) { | |
1646 | skb->sk = sk; | |
1647 | skb->destructor = sock_edemux; | |
1648 | if (sk->sk_state != TCP_TIME_WAIT) { | |
1649 | struct dst_entry *dst = sk->sk_rx_dst; | |
f3f12135 | 1650 | |
c7109986 | 1651 | if (dst) |
5d299f3d | 1652 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1653 | if (dst && |
f3f12135 | 1654 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1655 | skb_dst_set_noref(skb, dst); |
1656 | } | |
1657 | } | |
1658 | } | |
1659 | ||
ccb7c410 DM |
1660 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1661 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1662 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 1663 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
1664 | }; |
1665 | ||
3b401a81 | 1666 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1667 | .queue_xmit = inet6_csk_xmit, |
1668 | .send_check = tcp_v6_send_check, | |
1669 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1670 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1671 | .conn_request = tcp_v6_conn_request, |
1672 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1673 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1674 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1675 | .setsockopt = ipv6_setsockopt, |
1676 | .getsockopt = ipv6_getsockopt, | |
1677 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1678 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1679 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1680 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1681 | .compat_setsockopt = compat_ipv6_setsockopt, |
1682 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1683 | #endif |
1da177e4 LT |
1684 | }; |
1685 | ||
cfb6eeb4 | 1686 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1687 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1688 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1689 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1690 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1691 | }; |
a928630a | 1692 | #endif |
cfb6eeb4 | 1693 | |
1da177e4 LT |
1694 | /* |
1695 | * TCP over IPv4 via INET6 API | |
1696 | */ | |
3b401a81 | 1697 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1698 | .queue_xmit = ip_queue_xmit, |
1699 | .send_check = tcp_v4_send_check, | |
1700 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1701 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1702 | .conn_request = tcp_v6_conn_request, |
1703 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1704 | .net_header_len = sizeof(struct iphdr), |
1705 | .setsockopt = ipv6_setsockopt, | |
1706 | .getsockopt = ipv6_getsockopt, | |
1707 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1708 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1709 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1710 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1711 | .compat_setsockopt = compat_ipv6_setsockopt, |
1712 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1713 | #endif |
1da177e4 LT |
1714 | }; |
1715 | ||
cfb6eeb4 | 1716 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1717 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1718 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1719 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1720 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1721 | }; |
a928630a | 1722 | #endif |
cfb6eeb4 | 1723 | |
1da177e4 LT |
1724 | /* NOTE: A lot of things set to zero explicitly by call to |
1725 | * sk_alloc() so need not be done here. | |
1726 | */ | |
1727 | static int tcp_v6_init_sock(struct sock *sk) | |
1728 | { | |
6687e988 | 1729 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1730 | |
900f65d3 | 1731 | tcp_init_sock(sk); |
1da177e4 | 1732 | |
8292a17a | 1733 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1734 | |
cfb6eeb4 | 1735 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1736 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1737 | #endif |
1738 | ||
1da177e4 LT |
1739 | return 0; |
1740 | } | |
1741 | ||
7d06b2e0 | 1742 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1743 | { |
1da177e4 | 1744 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1745 | inet6_destroy_sock(sk); |
1da177e4 LT |
1746 | } |
1747 | ||
952a10be | 1748 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1749 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1750 | static void get_openreq6(struct seq_file *seq, |
a7cb5a49 | 1751 | const struct sock *sk, struct request_sock *req, int i, kuid_t uid) |
1da177e4 | 1752 | { |
1da177e4 | 1753 | int ttd = req->expires - jiffies; |
634fb979 ED |
1754 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1755 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1756 | |
1757 | if (ttd < 0) | |
1758 | ttd = 0; | |
1759 | ||
1da177e4 LT |
1760 | seq_printf(seq, |
1761 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1762 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1763 | i, |
1764 | src->s6_addr32[0], src->s6_addr32[1], | |
1765 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1766 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1767 | dest->s6_addr32[0], dest->s6_addr32[1], |
1768 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1769 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 1770 | TCP_SYN_RECV, |
4c99aa40 | 1771 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
1772 | 1, /* timers active (only the expire timer) */ |
1773 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1774 | req->num_timeout, |
a7cb5a49 | 1775 | from_kuid_munged(seq_user_ns(seq), uid), |
1ab1457c | 1776 | 0, /* non standard timer */ |
1da177e4 LT |
1777 | 0, /* open_requests have no inode */ |
1778 | 0, req); | |
1779 | } | |
1780 | ||
1781 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1782 | { | |
b71d1d42 | 1783 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1784 | __u16 destp, srcp; |
1785 | int timer_active; | |
1786 | unsigned long timer_expires; | |
cf533ea5 ED |
1787 | const struct inet_sock *inet = inet_sk(sp); |
1788 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1789 | const struct inet_connection_sock *icsk = inet_csk(sp); |
0a672f74 | 1790 | struct fastopen_queue *fastopenq = icsk->icsk_accept_queue.fastopenq; |
1da177e4 | 1791 | |
efe4208f ED |
1792 | dest = &sp->sk_v6_daddr; |
1793 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1794 | destp = ntohs(inet->inet_dport); |
1795 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
1796 | |
1797 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1798 | timer_active = 1; |
463c84b9 ACM |
1799 | timer_expires = icsk->icsk_timeout; |
1800 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1801 | timer_active = 4; |
463c84b9 | 1802 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1803 | } else if (timer_pending(&sp->sk_timer)) { |
1804 | timer_active = 2; | |
1805 | timer_expires = sp->sk_timer.expires; | |
1806 | } else { | |
1807 | timer_active = 0; | |
1808 | timer_expires = jiffies; | |
1809 | } | |
1810 | ||
1811 | seq_printf(seq, | |
1812 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1813 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1814 | i, |
1815 | src->s6_addr32[0], src->s6_addr32[1], | |
1816 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1817 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1818 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1819 | sp->sk_state, |
47da8ee6 SS |
1820 | tp->write_seq-tp->snd_una, |
1821 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 | 1822 | timer_active, |
a399a805 | 1823 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1824 | icsk->icsk_retransmits, |
a7cb5a49 | 1825 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1826 | icsk->icsk_probes_out, |
1da177e4 LT |
1827 | sock_i_ino(sp), |
1828 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1829 | jiffies_to_clock_t(icsk->icsk_rto), |
1830 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
4c99aa40 | 1831 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
0b6a05c1 | 1832 | tp->snd_cwnd, |
0a672f74 YC |
1833 | sp->sk_state == TCP_LISTEN ? |
1834 | (fastopenq ? fastopenq->max_qlen : 0) : | |
1835 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) | |
1da177e4 LT |
1836 | ); |
1837 | } | |
1838 | ||
1ab1457c | 1839 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1840 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1841 | { |
b71d1d42 | 1842 | const struct in6_addr *dest, *src; |
1da177e4 | 1843 | __u16 destp, srcp; |
96f817fe | 1844 | s32 delta = tw->tw_ttd - inet_tw_time_stamp(); |
1da177e4 | 1845 | |
efe4208f ED |
1846 | dest = &tw->tw_v6_daddr; |
1847 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1848 | destp = ntohs(tw->tw_dport); |
1849 | srcp = ntohs(tw->tw_sport); | |
1850 | ||
1851 | seq_printf(seq, | |
1852 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1853 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1854 | i, |
1855 | src->s6_addr32[0], src->s6_addr32[1], | |
1856 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1857 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1858 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1859 | tw->tw_substate, 0, 0, | |
a399a805 | 1860 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
1da177e4 LT |
1861 | atomic_read(&tw->tw_refcnt), tw); |
1862 | } | |
1863 | ||
1da177e4 LT |
1864 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1865 | { | |
1866 | struct tcp_iter_state *st; | |
05dbc7b5 | 1867 | struct sock *sk = v; |
1da177e4 LT |
1868 | |
1869 | if (v == SEQ_START_TOKEN) { | |
1870 | seq_puts(seq, | |
1871 | " sl " | |
1872 | "local_address " | |
1873 | "remote_address " | |
1874 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1875 | " uid timeout inode\n"); | |
1876 | goto out; | |
1877 | } | |
1878 | st = seq->private; | |
1879 | ||
1880 | switch (st->state) { | |
1881 | case TCP_SEQ_STATE_LISTENING: | |
1882 | case TCP_SEQ_STATE_ESTABLISHED: | |
05dbc7b5 ED |
1883 | if (sk->sk_state == TCP_TIME_WAIT) |
1884 | get_timewait6_sock(seq, v, st->num); | |
1885 | else | |
1886 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
1887 | break; |
1888 | case TCP_SEQ_STATE_OPENREQ: | |
1889 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
1890 | break; | |
1da177e4 LT |
1891 | } |
1892 | out: | |
1893 | return 0; | |
1894 | } | |
1895 | ||
73cb88ec AV |
1896 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1897 | .owner = THIS_MODULE, | |
1898 | .open = tcp_seq_open, | |
1899 | .read = seq_read, | |
1900 | .llseek = seq_lseek, | |
1901 | .release = seq_release_net | |
1902 | }; | |
1903 | ||
1da177e4 | 1904 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1905 | .name = "tcp6", |
1906 | .family = AF_INET6, | |
73cb88ec | 1907 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
1908 | .seq_ops = { |
1909 | .show = tcp6_seq_show, | |
1910 | }, | |
1da177e4 LT |
1911 | }; |
1912 | ||
2c8c1e72 | 1913 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1914 | { |
6f8b13bc | 1915 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1916 | } |
1917 | ||
6f8b13bc | 1918 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1919 | { |
6f8b13bc | 1920 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1921 | } |
1922 | #endif | |
1923 | ||
f77d6021 ED |
1924 | static void tcp_v6_clear_sk(struct sock *sk, int size) |
1925 | { | |
1926 | struct inet_sock *inet = inet_sk(sk); | |
1927 | ||
1928 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1929 | sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1930 | ||
1931 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1932 | memset(&inet->pinet6 + 1, 0, size); | |
1933 | } | |
1934 | ||
1da177e4 LT |
1935 | struct proto tcpv6_prot = { |
1936 | .name = "TCPv6", | |
1937 | .owner = THIS_MODULE, | |
1938 | .close = tcp_close, | |
1939 | .connect = tcp_v6_connect, | |
1940 | .disconnect = tcp_disconnect, | |
463c84b9 | 1941 | .accept = inet_csk_accept, |
1da177e4 LT |
1942 | .ioctl = tcp_ioctl, |
1943 | .init = tcp_v6_init_sock, | |
1944 | .destroy = tcp_v6_destroy_sock, | |
1945 | .shutdown = tcp_shutdown, | |
1946 | .setsockopt = tcp_setsockopt, | |
1947 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 1948 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
1949 | .sendmsg = tcp_sendmsg, |
1950 | .sendpage = tcp_sendpage, | |
1da177e4 | 1951 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 1952 | .release_cb = tcp_release_cb, |
563d34d0 | 1953 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 | 1954 | .hash = tcp_v6_hash, |
ab1e0a13 ACM |
1955 | .unhash = inet_unhash, |
1956 | .get_port = inet_csk_get_port, | |
1da177e4 | 1957 | .enter_memory_pressure = tcp_enter_memory_pressure, |
c9bee3b7 | 1958 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
1959 | .sockets_allocated = &tcp_sockets_allocated, |
1960 | .memory_allocated = &tcp_memory_allocated, | |
1961 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1962 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 1963 | .sysctl_mem = sysctl_tcp_mem, |
1da177e4 LT |
1964 | .sysctl_wmem = sysctl_tcp_wmem, |
1965 | .sysctl_rmem = sysctl_tcp_rmem, | |
1966 | .max_header = MAX_TCP_HEADER, | |
1967 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 1968 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 1969 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1970 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 1971 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 1972 | .no_autobind = true, |
543d9cfe ACM |
1973 | #ifdef CONFIG_COMPAT |
1974 | .compat_setsockopt = compat_tcp_setsockopt, | |
1975 | .compat_getsockopt = compat_tcp_getsockopt, | |
1976 | #endif | |
c255a458 | 1977 | #ifdef CONFIG_MEMCG_KMEM |
d1a4c0b3 GC |
1978 | .proto_cgroup = tcp_proto_cgroup, |
1979 | #endif | |
f77d6021 | 1980 | .clear_sk = tcp_v6_clear_sk, |
1da177e4 LT |
1981 | }; |
1982 | ||
41135cc8 | 1983 | static const struct inet6_protocol tcpv6_protocol = { |
c7109986 | 1984 | .early_demux = tcp_v6_early_demux, |
1da177e4 LT |
1985 | .handler = tcp_v6_rcv, |
1986 | .err_handler = tcp_v6_err, | |
1987 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1988 | }; | |
1989 | ||
1da177e4 LT |
1990 | static struct inet_protosw tcpv6_protosw = { |
1991 | .type = SOCK_STREAM, | |
1992 | .protocol = IPPROTO_TCP, | |
1993 | .prot = &tcpv6_prot, | |
1994 | .ops = &inet6_stream_ops, | |
1da177e4 | 1995 | .no_check = 0, |
d83d8461 ACM |
1996 | .flags = INET_PROTOSW_PERMANENT | |
1997 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
1998 | }; |
1999 | ||
2c8c1e72 | 2000 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 2001 | { |
5677242f DL |
2002 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2003 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2004 | } |
2005 | ||
2c8c1e72 | 2006 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 2007 | { |
5677242f | 2008 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
2009 | } |
2010 | ||
2c8c1e72 | 2011 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
2012 | { |
2013 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
2014 | } |
2015 | ||
2016 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
2017 | .init = tcpv6_net_init, |
2018 | .exit = tcpv6_net_exit, | |
2019 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
2020 | }; |
2021 | ||
7f4e4868 | 2022 | int __init tcpv6_init(void) |
1da177e4 | 2023 | { |
7f4e4868 DL |
2024 | int ret; |
2025 | ||
3336288a VY |
2026 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
2027 | if (ret) | |
c6b641a4 | 2028 | goto out; |
3336288a | 2029 | |
1da177e4 | 2030 | /* register inet6 protocol */ |
7f4e4868 DL |
2031 | ret = inet6_register_protosw(&tcpv6_protosw); |
2032 | if (ret) | |
2033 | goto out_tcpv6_protocol; | |
2034 | ||
93ec926b | 2035 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2036 | if (ret) |
2037 | goto out_tcpv6_protosw; | |
2038 | out: | |
2039 | return ret; | |
ae0f7d5f | 2040 | |
7f4e4868 DL |
2041 | out_tcpv6_protosw: |
2042 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
2043 | out_tcpv6_protocol: |
2044 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
2045 | goto out; |
2046 | } | |
2047 | ||
09f7709f | 2048 | void tcpv6_exit(void) |
7f4e4868 | 2049 | { |
93ec926b | 2050 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2051 | inet6_unregister_protosw(&tcpv6_protosw); |
2052 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2053 | } |