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Commit | Line | Data |
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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> |
1da177e4 LT |
66 | |
67 | #include <asm/uaccess.h> | |
68 | ||
69 | #include <linux/proc_fs.h> | |
70 | #include <linux/seq_file.h> | |
71 | ||
cfb6eeb4 YH |
72 | #include <linux/crypto.h> |
73 | #include <linux/scatterlist.h> | |
74 | ||
cfb6eeb4 | 75 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
6edafaaf GJ |
76 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
77 | struct request_sock *req); | |
1da177e4 LT |
78 | |
79 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 80 | |
3b401a81 SH |
81 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
82 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 83 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
84 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
85 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
86 | #else |
87 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 88 | const struct in6_addr *addr) |
9501f972 YH |
89 | { |
90 | return NULL; | |
91 | } | |
a928630a | 92 | #endif |
1da177e4 | 93 | |
fae6ef87 NC |
94 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
95 | { | |
96 | struct dst_entry *dst = skb_dst(skb); | |
97 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
98 | ||
99 | dst_hold(dst); | |
100 | sk->sk_rx_dst = dst; | |
101 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
102 | if (rt->rt6i_node) | |
103 | inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum; | |
104 | } | |
105 | ||
1da177e4 LT |
106 | static void tcp_v6_hash(struct sock *sk) |
107 | { | |
108 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 109 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
110 | tcp_prot.hash(sk); |
111 | return; | |
112 | } | |
113 | local_bh_disable(); | |
9327f705 | 114 | __inet6_hash(sk, NULL); |
1da177e4 LT |
115 | local_bh_enable(); |
116 | } | |
117 | } | |
118 | ||
cf533ea5 | 119 | static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) |
1da177e4 | 120 | { |
0660e03f ACM |
121 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
122 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
123 | tcp_hdr(skb)->dest, |
124 | tcp_hdr(skb)->source); | |
1da177e4 LT |
125 | } |
126 | ||
1ab1457c | 127 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
128 | int addr_len) |
129 | { | |
130 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 131 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 132 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
133 | struct ipv6_pinfo *np = inet6_sk(sk); |
134 | struct tcp_sock *tp = tcp_sk(sk); | |
20c59de2 | 135 | struct in6_addr *saddr = NULL, *final_p, final; |
493f377d | 136 | struct rt6_info *rt; |
4c9483b2 | 137 | struct flowi6 fl6; |
1da177e4 LT |
138 | struct dst_entry *dst; |
139 | int addr_type; | |
140 | int err; | |
141 | ||
1ab1457c | 142 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
143 | return -EINVAL; |
144 | ||
1ab1457c | 145 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 146 | return -EAFNOSUPPORT; |
1da177e4 | 147 | |
4c9483b2 | 148 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
149 | |
150 | if (np->sndflow) { | |
4c9483b2 DM |
151 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
152 | IP6_ECN_flow_init(fl6.flowlabel); | |
153 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 154 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 155 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
1da177e4 LT |
156 | if (flowlabel == NULL) |
157 | return -EINVAL; | |
4e3fd7a0 | 158 | usin->sin6_addr = flowlabel->dst; |
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 && | |
194 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
195 | tp->rx_opt.ts_recent = 0; | |
196 | tp->rx_opt.ts_recent_stamp = 0; | |
197 | tp->write_seq = 0; | |
198 | } | |
199 | ||
4e3fd7a0 | 200 | np->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, | |
239 | &np->rcv_saddr); | |
1da177e4 LT |
240 | } |
241 | ||
242 | return err; | |
243 | } | |
244 | ||
245 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
246 | saddr = &np->rcv_saddr; | |
247 | ||
4c9483b2 | 248 | fl6.flowi6_proto = IPPROTO_TCP; |
4e3fd7a0 AD |
249 | fl6.daddr = np->daddr; |
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 | |
4c9483b2 | 260 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); |
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; |
4e3fd7a0 | 268 | np->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 && | |
81166dd6 DM |
281 | ipv6_addr_equal(&rt->rt6i_dst.addr, &np->daddr)) |
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 LT |
299 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
300 | np->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); |
ec18d9a2 DM |
389 | } |
390 | ||
1da177e4 | 391 | if (type == ICMPV6_PKT_TOOBIG) { |
563d34d0 ED |
392 | tp->mtu_info = ntohl(info); |
393 | if (!sock_owned_by_user(sk)) | |
394 | tcp_v6_mtu_reduced(sk); | |
d013ef2a JA |
395 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
396 | &tp->tsq_flags)) | |
397 | sock_hold(sk); | |
1da177e4 LT |
398 | goto out; |
399 | } | |
400 | ||
401 | icmpv6_err_convert(type, code, &err); | |
402 | ||
60236fdd | 403 | /* Might be for an request_sock */ |
1da177e4 | 404 | switch (sk->sk_state) { |
60236fdd | 405 | struct request_sock *req, **prev; |
1da177e4 LT |
406 | case TCP_LISTEN: |
407 | if (sock_owned_by_user(sk)) | |
408 | goto out; | |
409 | ||
8129765a ACM |
410 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
411 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
412 | if (!req) |
413 | goto out; | |
414 | ||
415 | /* ICMPs are not backlogged, hence we cannot get | |
416 | * an established socket here. | |
417 | */ | |
547b792c | 418 | WARN_ON(req->sk != NULL); |
1da177e4 | 419 | |
2e6599cb | 420 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 421 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
422 | goto out; |
423 | } | |
424 | ||
463c84b9 | 425 | inet_csk_reqsk_queue_drop(sk, req, prev); |
5f1e942c | 426 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
427 | goto out; |
428 | ||
429 | case TCP_SYN_SENT: | |
430 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 431 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 432 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
433 | sk->sk_err = err; |
434 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
435 | ||
436 | tcp_done(sk); | |
437 | } else | |
438 | sk->sk_err_soft = err; | |
439 | goto out; | |
440 | } | |
441 | ||
442 | if (!sock_owned_by_user(sk) && np->recverr) { | |
443 | sk->sk_err = err; | |
444 | sk->sk_error_report(sk); | |
445 | } else | |
446 | sk->sk_err_soft = err; | |
447 | ||
448 | out: | |
449 | bh_unlock_sock(sk); | |
450 | sock_put(sk); | |
451 | } | |
452 | ||
453 | ||
9f10d3f6 NC |
454 | static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst, |
455 | struct flowi6 *fl6, | |
3840a06e | 456 | struct request_sock *req, |
fff32699 ED |
457 | struct request_values *rvp, |
458 | u16 queue_mapping) | |
1da177e4 | 459 | { |
ca304b61 | 460 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
461 | struct ipv6_pinfo *np = inet6_sk(sk); |
462 | struct sk_buff * skb; | |
9494218f | 463 | int err = -ENOMEM; |
1da177e4 | 464 | |
9f10d3f6 NC |
465 | /* First, grab a route. */ |
466 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL) | |
fd80eb94 | 467 | goto done; |
9494218f | 468 | |
8336886f | 469 | skb = tcp_make_synack(sk, dst, req, rvp, NULL); |
9494218f | 470 | |
1da177e4 | 471 | if (skb) { |
8ad50d96 | 472 | __tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr); |
1da177e4 | 473 | |
9f10d3f6 | 474 | fl6->daddr = treq->rmt_addr; |
fff32699 | 475 | skb_set_queue_mapping(skb, queue_mapping); |
43264e0b | 476 | err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass); |
b9df3cb8 | 477 | err = net_xmit_eval(err); |
1da177e4 LT |
478 | } |
479 | ||
480 | done: | |
1da177e4 LT |
481 | return err; |
482 | } | |
483 | ||
72659ecc OP |
484 | static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req, |
485 | struct request_values *rvp) | |
486 | { | |
9f10d3f6 | 487 | struct flowi6 fl6; |
e6c022a4 | 488 | int res; |
9f10d3f6 | 489 | |
e6c022a4 ED |
490 | res = tcp_v6_send_synack(sk, NULL, &fl6, req, rvp, 0); |
491 | if (!res) | |
492 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); | |
493 | return res; | |
72659ecc OP |
494 | } |
495 | ||
60236fdd | 496 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 497 | { |
800d55f1 | 498 | kfree_skb(inet6_rsk(req)->pktopts); |
1da177e4 LT |
499 | } |
500 | ||
cfb6eeb4 YH |
501 | #ifdef CONFIG_TCP_MD5SIG |
502 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 503 | const struct in6_addr *addr) |
cfb6eeb4 | 504 | { |
a915da9b | 505 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
506 | } |
507 | ||
508 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
509 | struct sock *addr_sk) | |
510 | { | |
511 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); | |
512 | } | |
513 | ||
514 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
515 | struct request_sock *req) | |
516 | { | |
517 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
518 | } | |
519 | ||
cfb6eeb4 YH |
520 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, |
521 | int optlen) | |
522 | { | |
523 | struct tcp_md5sig cmd; | |
524 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
525 | |
526 | if (optlen < sizeof(cmd)) | |
527 | return -EINVAL; | |
528 | ||
529 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
530 | return -EFAULT; | |
531 | ||
532 | if (sin6->sin6_family != AF_INET6) | |
533 | return -EINVAL; | |
534 | ||
535 | if (!cmd.tcpm_keylen) { | |
e773e4fa | 536 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b ED |
537 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
538 | AF_INET); | |
539 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, | |
540 | AF_INET6); | |
cfb6eeb4 YH |
541 | } |
542 | ||
543 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
544 | return -EINVAL; | |
545 | ||
a915da9b ED |
546 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
547 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
548 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 | 549 | |
a915da9b ED |
550 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
551 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
552 | } |
553 | ||
49a72dfb | 554 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
b71d1d42 ED |
555 | const struct in6_addr *daddr, |
556 | const struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 557 | { |
cfb6eeb4 | 558 | struct tcp6_pseudohdr *bp; |
49a72dfb | 559 | struct scatterlist sg; |
8d26d76d | 560 | |
cfb6eeb4 | 561 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 | 562 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
563 | bp->saddr = *saddr; |
564 | bp->daddr = *daddr; | |
49a72dfb | 565 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 566 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 567 | |
49a72dfb AL |
568 | sg_init_one(&sg, bp, sizeof(*bp)); |
569 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
570 | } | |
c7da57a1 | 571 | |
49a72dfb | 572 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
b71d1d42 | 573 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 574 | const struct tcphdr *th) |
49a72dfb AL |
575 | { |
576 | struct tcp_md5sig_pool *hp; | |
577 | struct hash_desc *desc; | |
578 | ||
579 | hp = tcp_get_md5sig_pool(); | |
580 | if (!hp) | |
581 | goto clear_hash_noput; | |
582 | desc = &hp->md5_desc; | |
583 | ||
584 | if (crypto_hash_init(desc)) | |
585 | goto clear_hash; | |
586 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
587 | goto clear_hash; | |
588 | if (tcp_md5_hash_header(hp, th)) | |
589 | goto clear_hash; | |
590 | if (tcp_md5_hash_key(hp, key)) | |
591 | goto clear_hash; | |
592 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 593 | goto clear_hash; |
cfb6eeb4 | 594 | |
cfb6eeb4 | 595 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 596 | return 0; |
49a72dfb | 597 | |
cfb6eeb4 YH |
598 | clear_hash: |
599 | tcp_put_md5sig_pool(); | |
600 | clear_hash_noput: | |
601 | memset(md5_hash, 0, 16); | |
49a72dfb | 602 | return 1; |
cfb6eeb4 YH |
603 | } |
604 | ||
49a72dfb | 605 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
318cf7aa ED |
606 | const struct sock *sk, |
607 | const struct request_sock *req, | |
608 | const struct sk_buff *skb) | |
cfb6eeb4 | 609 | { |
b71d1d42 | 610 | const struct in6_addr *saddr, *daddr; |
49a72dfb AL |
611 | struct tcp_md5sig_pool *hp; |
612 | struct hash_desc *desc; | |
318cf7aa | 613 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
614 | |
615 | if (sk) { | |
616 | saddr = &inet6_sk(sk)->saddr; | |
617 | daddr = &inet6_sk(sk)->daddr; | |
49a72dfb | 618 | } else if (req) { |
cfb6eeb4 YH |
619 | saddr = &inet6_rsk(req)->loc_addr; |
620 | daddr = &inet6_rsk(req)->rmt_addr; | |
49a72dfb | 621 | } else { |
b71d1d42 | 622 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
623 | saddr = &ip6h->saddr; |
624 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 625 | } |
49a72dfb AL |
626 | |
627 | hp = tcp_get_md5sig_pool(); | |
628 | if (!hp) | |
629 | goto clear_hash_noput; | |
630 | desc = &hp->md5_desc; | |
631 | ||
632 | if (crypto_hash_init(desc)) | |
633 | goto clear_hash; | |
634 | ||
635 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
636 | goto clear_hash; | |
637 | if (tcp_md5_hash_header(hp, th)) | |
638 | goto clear_hash; | |
639 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
640 | goto clear_hash; | |
641 | if (tcp_md5_hash_key(hp, key)) | |
642 | goto clear_hash; | |
643 | if (crypto_hash_final(desc, md5_hash)) | |
644 | goto clear_hash; | |
645 | ||
646 | tcp_put_md5sig_pool(); | |
647 | return 0; | |
648 | ||
649 | clear_hash: | |
650 | tcp_put_md5sig_pool(); | |
651 | clear_hash_noput: | |
652 | memset(md5_hash, 0, 16); | |
653 | return 1; | |
cfb6eeb4 YH |
654 | } |
655 | ||
318cf7aa | 656 | static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
cfb6eeb4 | 657 | { |
cf533ea5 | 658 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 659 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 660 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 661 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 662 | int genhash; |
cfb6eeb4 YH |
663 | u8 newhash[16]; |
664 | ||
665 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 666 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 667 | |
785957d3 DM |
668 | /* We've parsed the options - do we have a hash? */ |
669 | if (!hash_expected && !hash_location) | |
670 | return 0; | |
671 | ||
672 | if (hash_expected && !hash_location) { | |
673 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
674 | return 1; |
675 | } | |
676 | ||
785957d3 DM |
677 | if (!hash_expected && hash_location) { |
678 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
679 | return 1; |
680 | } | |
681 | ||
682 | /* check the signature */ | |
49a72dfb AL |
683 | genhash = tcp_v6_md5_hash_skb(newhash, |
684 | hash_expected, | |
685 | NULL, NULL, skb); | |
686 | ||
cfb6eeb4 | 687 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
e87cc472 JP |
688 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
689 | genhash ? "failed" : "mismatch", | |
690 | &ip6h->saddr, ntohs(th->source), | |
691 | &ip6h->daddr, ntohs(th->dest)); | |
cfb6eeb4 YH |
692 | return 1; |
693 | } | |
694 | return 0; | |
695 | } | |
696 | #endif | |
697 | ||
c6aefafb | 698 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 699 | .family = AF_INET6, |
2e6599cb | 700 | .obj_size = sizeof(struct tcp6_request_sock), |
72659ecc | 701 | .rtx_syn_ack = tcp_v6_rtx_synack, |
60236fdd ACM |
702 | .send_ack = tcp_v6_reqsk_send_ack, |
703 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc OP |
704 | .send_reset = tcp_v6_send_reset, |
705 | .syn_ack_timeout = tcp_syn_ack_timeout, | |
1da177e4 LT |
706 | }; |
707 | ||
cfb6eeb4 | 708 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 709 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 710 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 711 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 712 | }; |
b6332e6c | 713 | #endif |
cfb6eeb4 | 714 | |
626e264d | 715 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
ee684b6f AV |
716 | u32 tsval, u32 tsecr, |
717 | struct tcp_md5sig_key *key, int rst, u8 tclass) | |
1da177e4 | 718 | { |
cf533ea5 ED |
719 | const struct tcphdr *th = tcp_hdr(skb); |
720 | struct tcphdr *t1; | |
1da177e4 | 721 | struct sk_buff *buff; |
4c9483b2 | 722 | struct flowi6 fl6; |
adf30907 | 723 | struct net *net = dev_net(skb_dst(skb)->dev); |
e5047992 | 724 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 725 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 726 | struct dst_entry *dst; |
81ada62d | 727 | __be32 *topt; |
1da177e4 | 728 | |
ee684b6f | 729 | if (tsecr) |
626e264d | 730 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 731 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
732 | if (key) |
733 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
734 | #endif | |
735 | ||
cfb6eeb4 | 736 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 737 | GFP_ATOMIC); |
1ab1457c YH |
738 | if (buff == NULL) |
739 | return; | |
1da177e4 | 740 | |
cfb6eeb4 | 741 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 742 | |
cfb6eeb4 | 743 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 744 | skb_reset_transport_header(buff); |
1da177e4 LT |
745 | |
746 | /* Swap the send and the receive. */ | |
747 | memset(t1, 0, sizeof(*t1)); | |
748 | t1->dest = th->source; | |
749 | t1->source = th->dest; | |
cfb6eeb4 | 750 | t1->doff = tot_len / 4; |
626e264d IJ |
751 | t1->seq = htonl(seq); |
752 | t1->ack_seq = htonl(ack); | |
753 | t1->ack = !rst || !th->ack; | |
754 | t1->rst = rst; | |
755 | t1->window = htons(win); | |
1da177e4 | 756 | |
81ada62d IJ |
757 | topt = (__be32 *)(t1 + 1); |
758 | ||
ee684b6f | 759 | if (tsecr) { |
626e264d IJ |
760 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
761 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
762 | *topt++ = htonl(tsval); |
763 | *topt++ = htonl(tsecr); | |
626e264d IJ |
764 | } |
765 | ||
cfb6eeb4 YH |
766 | #ifdef CONFIG_TCP_MD5SIG |
767 | if (key) { | |
81ada62d IJ |
768 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
769 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
770 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
771 | &ipv6_hdr(skb)->saddr, |
772 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
773 | } |
774 | #endif | |
775 | ||
4c9483b2 | 776 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
777 | fl6.daddr = ipv6_hdr(skb)->saddr; |
778 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1da177e4 | 779 | |
e5700aff DM |
780 | buff->ip_summed = CHECKSUM_PARTIAL; |
781 | buff->csum = 0; | |
782 | ||
4c9483b2 | 783 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 784 | |
4c9483b2 | 785 | fl6.flowi6_proto = IPPROTO_TCP; |
4c675258 AK |
786 | if (ipv6_addr_type(&fl6.daddr) & IPV6_ADDR_LINKLOCAL) |
787 | fl6.flowi6_oif = inet6_iif(skb); | |
1958b856 DM |
788 | fl6.fl6_dport = t1->dest; |
789 | fl6.fl6_sport = t1->source; | |
4c9483b2 | 790 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 791 | |
c20121ae DL |
792 | /* Pass a socket to ip6_dst_lookup either it is for RST |
793 | * Underlying function will use this to retrieve the network | |
794 | * namespace | |
795 | */ | |
4c9483b2 | 796 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false); |
68d0c6d3 DM |
797 | if (!IS_ERR(dst)) { |
798 | skb_dst_set(buff, dst); | |
b903d324 | 799 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
68d0c6d3 DM |
800 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
801 | if (rst) | |
802 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
803 | return; | |
1da177e4 LT |
804 | } |
805 | ||
806 | kfree_skb(buff); | |
807 | } | |
808 | ||
626e264d | 809 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 810 | { |
cf533ea5 | 811 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 812 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 813 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
814 | #ifdef CONFIG_TCP_MD5SIG |
815 | const __u8 *hash_location = NULL; | |
816 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
817 | unsigned char newhash[16]; | |
818 | int genhash; | |
819 | struct sock *sk1 = NULL; | |
820 | #endif | |
1da177e4 | 821 | |
626e264d | 822 | if (th->rst) |
1da177e4 LT |
823 | return; |
824 | ||
626e264d IJ |
825 | if (!ipv6_unicast_destination(skb)) |
826 | return; | |
1da177e4 | 827 | |
cfb6eeb4 | 828 | #ifdef CONFIG_TCP_MD5SIG |
658ddaaf SL |
829 | hash_location = tcp_parse_md5sig_option(th); |
830 | if (!sk && hash_location) { | |
831 | /* | |
832 | * active side is lost. Try to find listening socket through | |
833 | * source port, and then find md5 key through listening socket. | |
834 | * we are not loose security here: | |
835 | * Incoming packet is checked with md5 hash with finding key, | |
836 | * no RST generated if md5 hash doesn't match. | |
837 | */ | |
838 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
5ba24953 TH |
839 | &tcp_hashinfo, &ipv6h->saddr, |
840 | th->source, &ipv6h->daddr, | |
658ddaaf SL |
841 | ntohs(th->source), inet6_iif(skb)); |
842 | if (!sk1) | |
843 | return; | |
844 | ||
845 | rcu_read_lock(); | |
846 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); | |
847 | if (!key) | |
848 | goto release_sk1; | |
849 | ||
850 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb); | |
851 | if (genhash || memcmp(hash_location, newhash, 16) != 0) | |
852 | goto release_sk1; | |
853 | } else { | |
854 | key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; | |
855 | } | |
cfb6eeb4 YH |
856 | #endif |
857 | ||
626e264d IJ |
858 | if (th->ack) |
859 | seq = ntohl(th->ack_seq); | |
860 | else | |
861 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
862 | (th->doff << 2); | |
1da177e4 | 863 | |
ee684b6f | 864 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, 0, key, 1, 0); |
658ddaaf SL |
865 | |
866 | #ifdef CONFIG_TCP_MD5SIG | |
867 | release_sk1: | |
868 | if (sk1) { | |
869 | rcu_read_unlock(); | |
870 | sock_put(sk1); | |
871 | } | |
872 | #endif | |
626e264d | 873 | } |
1da177e4 | 874 | |
ee684b6f AV |
875 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, |
876 | u32 win, u32 tsval, u32 tsecr, | |
b903d324 | 877 | struct tcp_md5sig_key *key, u8 tclass) |
626e264d | 878 | { |
ee684b6f | 879 | tcp_v6_send_response(skb, seq, ack, win, tsval, tsecr, key, 0, tclass); |
1da177e4 LT |
880 | } |
881 | ||
882 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
883 | { | |
8feaf0c0 | 884 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 885 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 886 | |
9501f972 | 887 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 888 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
ee684b6f | 889 | tcp_time_stamp + tcptw->tw_ts_offset, |
b903d324 ED |
890 | tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw), |
891 | tw->tw_tclass); | |
1da177e4 | 892 | |
8feaf0c0 | 893 | inet_twsk_put(tw); |
1da177e4 LT |
894 | } |
895 | ||
6edafaaf GJ |
896 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
897 | struct request_sock *req) | |
1da177e4 | 898 | { |
ee684b6f AV |
899 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, |
900 | req->rcv_wnd, tcp_time_stamp, req->ts_recent, | |
b903d324 | 901 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), 0); |
1da177e4 LT |
902 | } |
903 | ||
904 | ||
905 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
906 | { | |
60236fdd | 907 | struct request_sock *req, **prev; |
aa8223c7 | 908 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
909 | struct sock *nsk; |
910 | ||
911 | /* Find possible connection requests. */ | |
8129765a | 912 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
913 | &ipv6_hdr(skb)->saddr, |
914 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 | 915 | if (req) |
8336886f | 916 | return tcp_check_req(sk, skb, req, prev, false); |
1da177e4 | 917 | |
3b1e0a65 | 918 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
919 | &ipv6_hdr(skb)->saddr, th->source, |
920 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
921 | |
922 | if (nsk) { | |
923 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
924 | bh_lock_sock(nsk); | |
925 | return nsk; | |
926 | } | |
9469c7b4 | 927 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
928 | return NULL; |
929 | } | |
930 | ||
c6aefafb | 931 | #ifdef CONFIG_SYN_COOKIES |
af9b4738 | 932 | if (!th->syn) |
c6aefafb | 933 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
934 | #endif |
935 | return sk; | |
936 | } | |
937 | ||
1da177e4 LT |
938 | /* FIXME: this is substantially similar to the ipv4 code. |
939 | * Can some kind of merge be done? -- erics | |
940 | */ | |
941 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
942 | { | |
4957faad | 943 | struct tcp_extend_values tmp_ext; |
e6b4d113 | 944 | struct tcp_options_received tmp_opt; |
cf533ea5 | 945 | const u8 *hash_location; |
e6b4d113 | 946 | struct request_sock *req; |
ca304b61 | 947 | struct inet6_request_sock *treq; |
1da177e4 | 948 | struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 | 949 | struct tcp_sock *tp = tcp_sk(sk); |
e6b4d113 | 950 | __u32 isn = TCP_SKB_CB(skb)->when; |
493f377d | 951 | struct dst_entry *dst = NULL; |
3840a06e | 952 | struct flowi6 fl6; |
a2a385d6 | 953 | bool want_cookie = false; |
1da177e4 LT |
954 | |
955 | if (skb->protocol == htons(ETH_P_IP)) | |
956 | return tcp_v4_conn_request(sk, skb); | |
957 | ||
958 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 959 | goto drop; |
1da177e4 | 960 | |
463c84b9 | 961 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
946cedcc ED |
962 | want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6"); |
963 | if (!want_cookie) | |
964 | goto drop; | |
1da177e4 LT |
965 | } |
966 | ||
5f1e942c VS |
967 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) { |
968 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); | |
1da177e4 | 969 | goto drop; |
5f1e942c | 970 | } |
1da177e4 | 971 | |
ca304b61 | 972 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
973 | if (req == NULL) |
974 | goto drop; | |
975 | ||
cfb6eeb4 YH |
976 | #ifdef CONFIG_TCP_MD5SIG |
977 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
978 | #endif | |
979 | ||
1da177e4 LT |
980 | tcp_clear_options(&tmp_opt); |
981 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
982 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
2100c8d2 | 983 | tcp_parse_options(skb, &tmp_opt, &hash_location, 0, NULL); |
4957faad WAS |
984 | |
985 | if (tmp_opt.cookie_plus > 0 && | |
986 | tmp_opt.saw_tstamp && | |
987 | !tp->rx_opt.cookie_out_never && | |
988 | (sysctl_tcp_cookie_size > 0 || | |
989 | (tp->cookie_values != NULL && | |
990 | tp->cookie_values->cookie_desired > 0))) { | |
991 | u8 *c; | |
992 | u32 *d; | |
993 | u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS]; | |
994 | int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE; | |
995 | ||
996 | if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0) | |
997 | goto drop_and_free; | |
998 | ||
999 | /* Secret recipe starts with IP addresses */ | |
0eae88f3 | 1000 | d = (__force u32 *)&ipv6_hdr(skb)->daddr.s6_addr32[0]; |
4957faad WAS |
1001 | *mess++ ^= *d++; |
1002 | *mess++ ^= *d++; | |
1003 | *mess++ ^= *d++; | |
1004 | *mess++ ^= *d++; | |
0eae88f3 | 1005 | d = (__force u32 *)&ipv6_hdr(skb)->saddr.s6_addr32[0]; |
4957faad WAS |
1006 | *mess++ ^= *d++; |
1007 | *mess++ ^= *d++; | |
1008 | *mess++ ^= *d++; | |
1009 | *mess++ ^= *d++; | |
1010 | ||
1011 | /* plus variable length Initiator Cookie */ | |
1012 | c = (u8 *)mess; | |
1013 | while (l-- > 0) | |
1014 | *c++ ^= *hash_location++; | |
1da177e4 | 1015 | |
a2a385d6 | 1016 | want_cookie = false; /* not our kind of cookie */ |
4957faad WAS |
1017 | tmp_ext.cookie_out_never = 0; /* false */ |
1018 | tmp_ext.cookie_plus = tmp_opt.cookie_plus; | |
1019 | } else if (!tp->rx_opt.cookie_in_always) { | |
1020 | /* redundant indications, but ensure initialization. */ | |
1021 | tmp_ext.cookie_out_never = 1; /* true */ | |
1022 | tmp_ext.cookie_plus = 0; | |
1023 | } else { | |
1024 | goto drop_and_free; | |
1025 | } | |
1026 | tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always; | |
1da177e4 | 1027 | |
4dfc2817 | 1028 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 1029 | tcp_clear_options(&tmp_opt); |
c6aefafb | 1030 | |
1da177e4 LT |
1031 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1032 | tcp_openreq_init(req, &tmp_opt, skb); | |
1033 | ||
ca304b61 | 1034 | treq = inet6_rsk(req); |
4e3fd7a0 AD |
1035 | treq->rmt_addr = ipv6_hdr(skb)->saddr; |
1036 | treq->loc_addr = ipv6_hdr(skb)->daddr; | |
172d69e6 | 1037 | if (!want_cookie || tmp_opt.tstamp_ok) |
5d134f1c | 1038 | TCP_ECN_create_request(req, skb, sock_net(sk)); |
c6aefafb | 1039 | |
4d0fe50c ED |
1040 | treq->iif = sk->sk_bound_dev_if; |
1041 | ||
1042 | /* So that link locals have meaning */ | |
1043 | if (!sk->sk_bound_dev_if && | |
1044 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1045 | treq->iif = inet6_iif(skb); | |
1046 | ||
2bbdf389 | 1047 | if (!isn) { |
c6aefafb GG |
1048 | if (ipv6_opt_accepted(sk, skb) || |
1049 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1050 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1051 | atomic_inc(&skb->users); | |
1052 | treq->pktopts = skb; | |
1053 | } | |
493f377d DM |
1054 | |
1055 | if (want_cookie) { | |
2bbdf389 FW |
1056 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); |
1057 | req->cookie_ts = tmp_opt.tstamp_ok; | |
493f377d DM |
1058 | goto have_isn; |
1059 | } | |
1060 | ||
1061 | /* VJ's idea. We save last timestamp seen | |
1062 | * from the destination in peer table, when entering | |
1063 | * state TIME-WAIT, and check against it before | |
1064 | * accepting new connection request. | |
1065 | * | |
1066 | * If "isn" is not zero, this request hit alive | |
1067 | * timewait bucket, so that all the necessary checks | |
1068 | * are made in the function processing timewait state. | |
1069 | */ | |
1070 | if (tmp_opt.saw_tstamp && | |
1071 | tcp_death_row.sysctl_tw_recycle && | |
81166dd6 DM |
1072 | (dst = inet6_csk_route_req(sk, &fl6, req)) != NULL) { |
1073 | if (!tcp_peer_is_proven(req, dst, true)) { | |
493f377d DM |
1074 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); |
1075 | goto drop_and_release; | |
1076 | } | |
1077 | } | |
1078 | /* Kill the following clause, if you dislike this way. */ | |
1079 | else if (!sysctl_tcp_syncookies && | |
1080 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < | |
1081 | (sysctl_max_syn_backlog >> 2)) && | |
81166dd6 | 1082 | !tcp_peer_is_proven(req, dst, false)) { |
493f377d DM |
1083 | /* Without syncookies last quarter of |
1084 | * backlog is filled with destinations, | |
1085 | * proven to be alive. | |
1086 | * It means that we continue to communicate | |
1087 | * to destinations, already remembered | |
1088 | * to the moment of synflood. | |
1089 | */ | |
1090 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n", | |
1091 | &treq->rmt_addr, ntohs(tcp_hdr(skb)->source)); | |
1092 | goto drop_and_release; | |
2bbdf389 | 1093 | } |
493f377d DM |
1094 | |
1095 | isn = tcp_v6_init_sequence(skb); | |
c6aefafb | 1096 | } |
493f377d | 1097 | have_isn: |
2e6599cb | 1098 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1099 | |
437c5b53 NC |
1100 | if (security_inet_conn_request(sk, skb, req)) |
1101 | goto drop_and_release; | |
4237c75c | 1102 | |
9f10d3f6 | 1103 | if (tcp_v6_send_synack(sk, dst, &fl6, req, |
fff32699 ED |
1104 | (struct request_values *)&tmp_ext, |
1105 | skb_get_queue_mapping(skb)) || | |
4957faad | 1106 | want_cookie) |
e6b4d113 | 1107 | goto drop_and_free; |
1da177e4 | 1108 | |
016818d0 | 1109 | tcp_rsk(req)->snt_synack = tcp_time_stamp; |
8336886f | 1110 | tcp_rsk(req)->listener = NULL; |
e6b4d113 WAS |
1111 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1112 | return 0; | |
1da177e4 | 1113 | |
493f377d DM |
1114 | drop_and_release: |
1115 | dst_release(dst); | |
e6b4d113 WAS |
1116 | drop_and_free: |
1117 | reqsk_free(req); | |
1da177e4 | 1118 | drop: |
5f1e942c | 1119 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1120 | return 0; /* don't send reset */ |
1121 | } | |
1122 | ||
1123 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1124 | struct request_sock *req, |
1da177e4 LT |
1125 | struct dst_entry *dst) |
1126 | { | |
78d15e82 | 1127 | struct inet6_request_sock *treq; |
1da177e4 LT |
1128 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1129 | struct tcp6_sock *newtcp6sk; | |
1130 | struct inet_sock *newinet; | |
1131 | struct tcp_sock *newtp; | |
1132 | struct sock *newsk; | |
cfb6eeb4 YH |
1133 | #ifdef CONFIG_TCP_MD5SIG |
1134 | struct tcp_md5sig_key *key; | |
1135 | #endif | |
3840a06e | 1136 | struct flowi6 fl6; |
1da177e4 LT |
1137 | |
1138 | if (skb->protocol == htons(ETH_P_IP)) { | |
1139 | /* | |
1140 | * v6 mapped | |
1141 | */ | |
1142 | ||
1143 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1144 | ||
1ab1457c | 1145 | if (newsk == NULL) |
1da177e4 LT |
1146 | return NULL; |
1147 | ||
1148 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1149 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1150 | ||
1151 | newinet = inet_sk(newsk); | |
1152 | newnp = inet6_sk(newsk); | |
1153 | newtp = tcp_sk(newsk); | |
1154 | ||
1155 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1156 | ||
c720c7e8 | 1157 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); |
1da177e4 | 1158 | |
c720c7e8 | 1159 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 | 1160 | |
4e3fd7a0 | 1161 | newnp->rcv_saddr = newnp->saddr; |
1da177e4 | 1162 | |
8292a17a | 1163 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1164 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1165 | #ifdef CONFIG_TCP_MD5SIG |
1166 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1167 | #endif | |
1168 | ||
676a1184 YZ |
1169 | newnp->ipv6_ac_list = NULL; |
1170 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1171 | newnp->pktoptions = NULL; |
1172 | newnp->opt = NULL; | |
505cbfc5 | 1173 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1174 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
e7219858 | 1175 | newnp->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 | 1176 | |
e6848976 ACM |
1177 | /* |
1178 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1179 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1180 | * that function for the gory details. -acme | |
1da177e4 | 1181 | */ |
1da177e4 LT |
1182 | |
1183 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1184 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1185 | Sync it now. |
1186 | */ | |
d83d8461 | 1187 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1188 | |
1189 | return newsk; | |
1190 | } | |
1191 | ||
78d15e82 | 1192 | treq = inet6_rsk(req); |
1da177e4 LT |
1193 | |
1194 | if (sk_acceptq_is_full(sk)) | |
1195 | goto out_overflow; | |
1196 | ||
493f377d | 1197 | if (!dst) { |
3840a06e | 1198 | dst = inet6_csk_route_req(sk, &fl6, req); |
493f377d | 1199 | if (!dst) |
1da177e4 | 1200 | goto out; |
1ab1457c | 1201 | } |
1da177e4 LT |
1202 | |
1203 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1204 | if (newsk == NULL) | |
093d2823 | 1205 | goto out_nonewsk; |
1da177e4 | 1206 | |
e6848976 ACM |
1207 | /* |
1208 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1209 | * count here, tcp_create_openreq_child now does this for us, see the | |
1210 | * comment in that function for the gory details. -acme | |
1211 | */ | |
1da177e4 | 1212 | |
59eed279 | 1213 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1214 | __ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1215 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1216 | |
1217 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1218 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1219 | ||
1220 | newtp = tcp_sk(newsk); | |
1221 | newinet = inet_sk(newsk); | |
1222 | newnp = inet6_sk(newsk); | |
1223 | ||
1224 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1225 | ||
4e3fd7a0 AD |
1226 | newnp->daddr = treq->rmt_addr; |
1227 | newnp->saddr = treq->loc_addr; | |
1228 | newnp->rcv_saddr = treq->loc_addr; | |
2e6599cb | 1229 | newsk->sk_bound_dev_if = treq->iif; |
1da177e4 | 1230 | |
1ab1457c | 1231 | /* Now IPv6 options... |
1da177e4 LT |
1232 | |
1233 | First: no IPv4 options. | |
1234 | */ | |
f6d8bd05 | 1235 | newinet->inet_opt = NULL; |
676a1184 | 1236 | newnp->ipv6_ac_list = NULL; |
d35690be | 1237 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1238 | |
1239 | /* Clone RX bits */ | |
1240 | newnp->rxopt.all = np->rxopt.all; | |
1241 | ||
1242 | /* Clone pktoptions received with SYN */ | |
1243 | newnp->pktoptions = NULL; | |
2e6599cb | 1244 | if (treq->pktopts != NULL) { |
99a1dec7 MG |
1245 | newnp->pktoptions = skb_clone(treq->pktopts, |
1246 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
ab185d7b | 1247 | consume_skb(treq->pktopts); |
2e6599cb | 1248 | treq->pktopts = NULL; |
1da177e4 LT |
1249 | if (newnp->pktoptions) |
1250 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1251 | } | |
1252 | newnp->opt = NULL; | |
505cbfc5 | 1253 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1254 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
e7219858 | 1255 | newnp->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 LT |
1256 | |
1257 | /* Clone native IPv6 options from listening socket (if any) | |
1258 | ||
1259 | Yes, keeping reference count would be much more clever, | |
1260 | but we make one more one thing there: reattach optmem | |
1261 | to newsk. | |
1262 | */ | |
43264e0b RL |
1263 | if (np->opt) |
1264 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
1da177e4 | 1265 | |
d83d8461 | 1266 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1267 | if (newnp->opt) |
d83d8461 ACM |
1268 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1269 | newnp->opt->opt_flen); | |
1da177e4 | 1270 | |
5d424d5a | 1271 | tcp_mtup_init(newsk); |
1da177e4 | 1272 | tcp_sync_mss(newsk, dst_mtu(dst)); |
0dbaee3b | 1273 | newtp->advmss = dst_metric_advmss(dst); |
d135c522 NC |
1274 | if (tcp_sk(sk)->rx_opt.user_mss && |
1275 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1276 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1277 | ||
1da177e4 | 1278 | tcp_initialize_rcv_mss(newsk); |
623df484 | 1279 | tcp_synack_rtt_meas(newsk, req); |
e6c022a4 | 1280 | newtp->total_retrans = req->num_retrans; |
1da177e4 | 1281 | |
c720c7e8 ED |
1282 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1283 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1284 | |
cfb6eeb4 YH |
1285 | #ifdef CONFIG_TCP_MD5SIG |
1286 | /* Copy over the MD5 key from the original socket */ | |
1287 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1288 | /* We're using one, so create a matching key | |
1289 | * on the newsk structure. If we fail to get | |
1290 | * memory, then we end up not copying the key | |
1291 | * across. Shucks. | |
1292 | */ | |
a915da9b | 1293 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newnp->daddr, |
99a1dec7 MG |
1294 | AF_INET6, key->key, key->keylen, |
1295 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
cfb6eeb4 YH |
1296 | } |
1297 | #endif | |
1298 | ||
093d2823 | 1299 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1300 | inet_csk_prepare_forced_close(newsk); |
1301 | tcp_done(newsk); | |
093d2823 BS |
1302 | goto out; |
1303 | } | |
9327f705 | 1304 | __inet6_hash(newsk, NULL); |
1da177e4 LT |
1305 | |
1306 | return newsk; | |
1307 | ||
1308 | out_overflow: | |
de0744af | 1309 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1310 | out_nonewsk: |
1da177e4 | 1311 | dst_release(dst); |
093d2823 BS |
1312 | out: |
1313 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); | |
1da177e4 LT |
1314 | return NULL; |
1315 | } | |
1316 | ||
b51655b9 | 1317 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1318 | { |
84fa7933 | 1319 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
684f2176 | 1320 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1321 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1322 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1323 | return 0; |
fb286bb2 | 1324 | } |
1da177e4 | 1325 | } |
fb286bb2 | 1326 | |
684f2176 | 1327 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
0660e03f ACM |
1328 | &ipv6_hdr(skb)->saddr, |
1329 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1330 | |
1da177e4 | 1331 | if (skb->len <= 76) { |
fb286bb2 | 1332 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1333 | } |
1334 | return 0; | |
1335 | } | |
1336 | ||
1337 | /* The socket must have it's spinlock held when we get | |
1338 | * here. | |
1339 | * | |
1340 | * We have a potential double-lock case here, so even when | |
1341 | * doing backlog processing we use the BH locking scheme. | |
1342 | * This is because we cannot sleep with the original spinlock | |
1343 | * held. | |
1344 | */ | |
1345 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1346 | { | |
1347 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1348 | struct tcp_sock *tp; | |
1349 | struct sk_buff *opt_skb = NULL; | |
1350 | ||
1351 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1352 | goes to IPv4 receive handler and backlogged. | |
1353 | From backlog it always goes here. Kerboom... | |
1354 | Fortunately, tcp_rcv_established and rcv_established | |
1355 | handle them correctly, but it is not case with | |
1356 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1357 | */ | |
1358 | ||
1359 | if (skb->protocol == htons(ETH_P_IP)) | |
1360 | return tcp_v4_do_rcv(sk, skb); | |
1361 | ||
cfb6eeb4 YH |
1362 | #ifdef CONFIG_TCP_MD5SIG |
1363 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1364 | goto discard; | |
1365 | #endif | |
1366 | ||
fda9ef5d | 1367 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1368 | goto discard; |
1369 | ||
1370 | /* | |
1371 | * socket locking is here for SMP purposes as backlog rcv | |
1372 | * is currently called with bh processing disabled. | |
1373 | */ | |
1374 | ||
1375 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1376 | ||
1377 | Yes, guys, it is the only place in our code, where we | |
1378 | may make it not affecting IPv4. | |
1379 | The rest of code is protocol independent, | |
1380 | and I do not like idea to uglify IPv4. | |
1381 | ||
1382 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1383 | looks not very well thought. For now we latch | |
1384 | options, received in the last packet, enqueued | |
1385 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1386 | --ANK (980728) |
1da177e4 LT |
1387 | */ |
1388 | if (np->rxopt.all) | |
99a1dec7 | 1389 | opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC)); |
1da177e4 LT |
1390 | |
1391 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1392 | struct dst_entry *dst = sk->sk_rx_dst; |
1393 | ||
bdeab991 | 1394 | sock_rps_save_rxhash(sk, skb); |
5d299f3d ED |
1395 | if (dst) { |
1396 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1397 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1398 | dst_release(dst); | |
1399 | sk->sk_rx_dst = NULL; | |
1400 | } | |
1401 | } | |
1402 | ||
aa8223c7 | 1403 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1404 | goto reset; |
1da177e4 LT |
1405 | if (opt_skb) |
1406 | goto ipv6_pktoptions; | |
1407 | return 0; | |
1408 | } | |
1409 | ||
ab6a5bb6 | 1410 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1411 | goto csum_err; |
1412 | ||
1ab1457c | 1413 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1414 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1415 | if (!nsk) | |
1416 | goto discard; | |
1417 | ||
1418 | /* | |
1419 | * Queue it on the new socket if the new socket is active, | |
1420 | * otherwise we just shortcircuit this and continue with | |
1421 | * the new socket.. | |
1422 | */ | |
1ab1457c | 1423 | if(nsk != sk) { |
bdeab991 | 1424 | sock_rps_save_rxhash(nsk, skb); |
1da177e4 LT |
1425 | if (tcp_child_process(sk, nsk, skb)) |
1426 | goto reset; | |
1427 | if (opt_skb) | |
1428 | __kfree_skb(opt_skb); | |
1429 | return 0; | |
1430 | } | |
47482f13 | 1431 | } else |
bdeab991 | 1432 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1433 | |
aa8223c7 | 1434 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1435 | goto reset; |
1da177e4 LT |
1436 | if (opt_skb) |
1437 | goto ipv6_pktoptions; | |
1438 | return 0; | |
1439 | ||
1440 | reset: | |
cfb6eeb4 | 1441 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1442 | discard: |
1443 | if (opt_skb) | |
1444 | __kfree_skb(opt_skb); | |
1445 | kfree_skb(skb); | |
1446 | return 0; | |
1447 | csum_err: | |
63231bdd | 1448 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1449 | goto discard; |
1450 | ||
1451 | ||
1452 | ipv6_pktoptions: | |
1453 | /* Do you ask, what is it? | |
1454 | ||
1455 | 1. skb was enqueued by tcp. | |
1456 | 2. skb is added to tail of read queue, rather than out of order. | |
1457 | 3. socket is not in passive state. | |
1458 | 4. Finally, it really contains options, which user wants to receive. | |
1459 | */ | |
1460 | tp = tcp_sk(sk); | |
1461 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1462 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1463 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1464 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1465 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1466 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
4c507d28 | 1467 | if (np->rxopt.bits.rxtclass) |
e7219858 | 1468 | np->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 LT |
1469 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1470 | skb_set_owner_r(opt_skb, sk); | |
1471 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1472 | } else { | |
1473 | __kfree_skb(opt_skb); | |
1474 | opt_skb = xchg(&np->pktoptions, NULL); | |
1475 | } | |
1476 | } | |
1477 | ||
800d55f1 | 1478 | kfree_skb(opt_skb); |
1da177e4 LT |
1479 | return 0; |
1480 | } | |
1481 | ||
e5bbef20 | 1482 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1483 | { |
cf533ea5 | 1484 | const struct tcphdr *th; |
b71d1d42 | 1485 | const struct ipv6hdr *hdr; |
1da177e4 LT |
1486 | struct sock *sk; |
1487 | int ret; | |
a86b1e30 | 1488 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1489 | |
1490 | if (skb->pkt_type != PACKET_HOST) | |
1491 | goto discard_it; | |
1492 | ||
1493 | /* | |
1494 | * Count it even if it's bad. | |
1495 | */ | |
63231bdd | 1496 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1497 | |
1498 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1499 | goto discard_it; | |
1500 | ||
aa8223c7 | 1501 | th = tcp_hdr(skb); |
1da177e4 LT |
1502 | |
1503 | if (th->doff < sizeof(struct tcphdr)/4) | |
1504 | goto bad_packet; | |
1505 | if (!pskb_may_pull(skb, th->doff*4)) | |
1506 | goto discard_it; | |
1507 | ||
60476372 | 1508 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1da177e4 LT |
1509 | goto bad_packet; |
1510 | ||
aa8223c7 | 1511 | th = tcp_hdr(skb); |
e802af9c | 1512 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
1513 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1514 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1515 | skb->len - th->doff*4); | |
1516 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1517 | TCP_SKB_CB(skb)->when = 0; | |
b82d1bb4 | 1518 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); |
1da177e4 LT |
1519 | TCP_SKB_CB(skb)->sacked = 0; |
1520 | ||
9a1f27c4 | 1521 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1522 | if (!sk) |
1523 | goto no_tcp_socket; | |
1524 | ||
1525 | process: | |
1526 | if (sk->sk_state == TCP_TIME_WAIT) | |
1527 | goto do_time_wait; | |
1528 | ||
e802af9c SH |
1529 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1530 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1531 | goto discard_and_relse; | |
1532 | } | |
1533 | ||
1da177e4 LT |
1534 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1535 | goto discard_and_relse; | |
1536 | ||
fda9ef5d | 1537 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1538 | goto discard_and_relse; |
1539 | ||
1540 | skb->dev = NULL; | |
1541 | ||
293b9c42 | 1542 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1543 | ret = 0; |
1544 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1545 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1546 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a | 1547 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
a2bd1140 | 1548 | tp->ucopy.dma_chan = net_dma_find_channel(); |
1ab1457c YH |
1549 | if (tp->ucopy.dma_chan) |
1550 | ret = tcp_v6_do_rcv(sk, skb); | |
1551 | else | |
1a2449a8 CL |
1552 | #endif |
1553 | { | |
1554 | if (!tcp_prequeue(sk, skb)) | |
1555 | ret = tcp_v6_do_rcv(sk, skb); | |
1556 | } | |
da882c1f ED |
1557 | } else if (unlikely(sk_add_backlog(sk, skb, |
1558 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1559 | bh_unlock_sock(sk); |
6cce09f8 | 1560 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1561 | goto discard_and_relse; |
1562 | } | |
1da177e4 LT |
1563 | bh_unlock_sock(sk); |
1564 | ||
1565 | sock_put(sk); | |
1566 | return ret ? -1 : 0; | |
1567 | ||
1568 | no_tcp_socket: | |
1569 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1570 | goto discard_it; | |
1571 | ||
1572 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1573 | bad_packet: | |
63231bdd | 1574 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1575 | } else { |
cfb6eeb4 | 1576 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1577 | } |
1578 | ||
1579 | discard_it: | |
1580 | ||
1581 | /* | |
1582 | * Discard frame | |
1583 | */ | |
1584 | ||
1585 | kfree_skb(skb); | |
1586 | return 0; | |
1587 | ||
1588 | discard_and_relse: | |
1589 | sock_put(sk); | |
1590 | goto discard_it; | |
1591 | ||
1592 | do_time_wait: | |
1593 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1594 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1595 | goto discard_it; |
1596 | } | |
1597 | ||
1598 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
63231bdd | 1599 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
9469c7b4 | 1600 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1601 | goto discard_it; |
1602 | } | |
1603 | ||
9469c7b4 | 1604 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1605 | case TCP_TW_SYN: |
1606 | { | |
1607 | struct sock *sk2; | |
1608 | ||
c346dca1 | 1609 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
5ba24953 | 1610 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1611 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1612 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1613 | if (sk2 != NULL) { |
295ff7ed ACM |
1614 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1615 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1616 | inet_twsk_put(tw); | |
1da177e4 LT |
1617 | sk = sk2; |
1618 | goto process; | |
1619 | } | |
1620 | /* Fall through to ACK */ | |
1621 | } | |
1622 | case TCP_TW_ACK: | |
1623 | tcp_v6_timewait_ack(sk, skb); | |
1624 | break; | |
1625 | case TCP_TW_RST: | |
1626 | goto no_tcp_socket; | |
1627 | case TCP_TW_SUCCESS:; | |
1628 | } | |
1629 | goto discard_it; | |
1630 | } | |
1631 | ||
c7109986 ED |
1632 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1633 | { | |
1634 | const struct ipv6hdr *hdr; | |
1635 | const struct tcphdr *th; | |
1636 | struct sock *sk; | |
1637 | ||
1638 | if (skb->pkt_type != PACKET_HOST) | |
1639 | return; | |
1640 | ||
1641 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1642 | return; | |
1643 | ||
1644 | hdr = ipv6_hdr(skb); | |
1645 | th = tcp_hdr(skb); | |
1646 | ||
1647 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1648 | return; | |
1649 | ||
1650 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, | |
1651 | &hdr->saddr, th->source, | |
1652 | &hdr->daddr, ntohs(th->dest), | |
1653 | inet6_iif(skb)); | |
1654 | if (sk) { | |
1655 | skb->sk = sk; | |
1656 | skb->destructor = sock_edemux; | |
1657 | if (sk->sk_state != TCP_TIME_WAIT) { | |
1658 | struct dst_entry *dst = sk->sk_rx_dst; | |
f3f12135 | 1659 | |
c7109986 | 1660 | if (dst) |
5d299f3d | 1661 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1662 | if (dst && |
f3f12135 | 1663 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1664 | skb_dst_set_noref(skb, dst); |
1665 | } | |
1666 | } | |
1667 | } | |
1668 | ||
ccb7c410 DM |
1669 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1670 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1671 | .twsk_unique = tcp_twsk_unique, | |
1672 | .twsk_destructor= tcp_twsk_destructor, | |
ccb7c410 DM |
1673 | }; |
1674 | ||
3b401a81 | 1675 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1676 | .queue_xmit = inet6_csk_xmit, |
1677 | .send_check = tcp_v6_send_check, | |
1678 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1679 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1680 | .conn_request = tcp_v6_conn_request, |
1681 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1682 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1683 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1684 | .setsockopt = ipv6_setsockopt, |
1685 | .getsockopt = ipv6_getsockopt, | |
1686 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1687 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1688 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1689 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1690 | .compat_setsockopt = compat_ipv6_setsockopt, |
1691 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1692 | #endif |
1da177e4 LT |
1693 | }; |
1694 | ||
cfb6eeb4 | 1695 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1696 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1697 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1698 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1699 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1700 | }; |
a928630a | 1701 | #endif |
cfb6eeb4 | 1702 | |
1da177e4 LT |
1703 | /* |
1704 | * TCP over IPv4 via INET6 API | |
1705 | */ | |
1706 | ||
3b401a81 | 1707 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1708 | .queue_xmit = ip_queue_xmit, |
1709 | .send_check = tcp_v4_send_check, | |
1710 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1711 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1712 | .conn_request = tcp_v6_conn_request, |
1713 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1714 | .net_header_len = sizeof(struct iphdr), |
1715 | .setsockopt = ipv6_setsockopt, | |
1716 | .getsockopt = ipv6_getsockopt, | |
1717 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1718 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1719 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1720 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1721 | .compat_setsockopt = compat_ipv6_setsockopt, |
1722 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1723 | #endif |
1da177e4 LT |
1724 | }; |
1725 | ||
cfb6eeb4 | 1726 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1727 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1728 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1729 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1730 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1731 | }; |
a928630a | 1732 | #endif |
cfb6eeb4 | 1733 | |
1da177e4 LT |
1734 | /* NOTE: A lot of things set to zero explicitly by call to |
1735 | * sk_alloc() so need not be done here. | |
1736 | */ | |
1737 | static int tcp_v6_init_sock(struct sock *sk) | |
1738 | { | |
6687e988 | 1739 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1740 | |
900f65d3 | 1741 | tcp_init_sock(sk); |
1da177e4 | 1742 | |
8292a17a | 1743 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1744 | |
cfb6eeb4 | 1745 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1746 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1747 | #endif |
1748 | ||
1da177e4 LT |
1749 | return 0; |
1750 | } | |
1751 | ||
7d06b2e0 | 1752 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1753 | { |
1da177e4 | 1754 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1755 | inet6_destroy_sock(sk); |
1da177e4 LT |
1756 | } |
1757 | ||
952a10be | 1758 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1759 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1760 | static void get_openreq6(struct seq_file *seq, |
a7cb5a49 | 1761 | const struct sock *sk, struct request_sock *req, int i, kuid_t uid) |
1da177e4 | 1762 | { |
1da177e4 | 1763 | int ttd = req->expires - jiffies; |
b71d1d42 ED |
1764 | const struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1765 | const struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1766 | |
1767 | if (ttd < 0) | |
1768 | ttd = 0; | |
1769 | ||
1da177e4 LT |
1770 | seq_printf(seq, |
1771 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1772 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1773 | i, |
1774 | src->s6_addr32[0], src->s6_addr32[1], | |
1775 | src->s6_addr32[2], src->s6_addr32[3], | |
fd507037 | 1776 | ntohs(inet_rsk(req)->loc_port), |
1da177e4 LT |
1777 | dest->s6_addr32[0], dest->s6_addr32[1], |
1778 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1779 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1780 | TCP_SYN_RECV, |
1781 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
1782 | 1, /* timers active (only the expire timer) */ |
1783 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1784 | req->num_timeout, |
a7cb5a49 | 1785 | from_kuid_munged(seq_user_ns(seq), uid), |
1ab1457c | 1786 | 0, /* non standard timer */ |
1da177e4 LT |
1787 | 0, /* open_requests have no inode */ |
1788 | 0, req); | |
1789 | } | |
1790 | ||
1791 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1792 | { | |
b71d1d42 | 1793 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1794 | __u16 destp, srcp; |
1795 | int timer_active; | |
1796 | unsigned long timer_expires; | |
cf533ea5 ED |
1797 | const struct inet_sock *inet = inet_sk(sp); |
1798 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1799 | const struct inet_connection_sock *icsk = inet_csk(sp); |
cf533ea5 | 1800 | const struct ipv6_pinfo *np = inet6_sk(sp); |
1da177e4 LT |
1801 | |
1802 | dest = &np->daddr; | |
1803 | src = &np->rcv_saddr; | |
c720c7e8 ED |
1804 | destp = ntohs(inet->inet_dport); |
1805 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
1806 | |
1807 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1808 | timer_active = 1; |
463c84b9 ACM |
1809 | timer_expires = icsk->icsk_timeout; |
1810 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1811 | timer_active = 4; |
463c84b9 | 1812 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1813 | } else if (timer_pending(&sp->sk_timer)) { |
1814 | timer_active = 2; | |
1815 | timer_expires = sp->sk_timer.expires; | |
1816 | } else { | |
1817 | timer_active = 0; | |
1818 | timer_expires = jiffies; | |
1819 | } | |
1820 | ||
1821 | seq_printf(seq, | |
1822 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1823 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1824 | i, |
1825 | src->s6_addr32[0], src->s6_addr32[1], | |
1826 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1827 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1828 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1829 | sp->sk_state, |
47da8ee6 SS |
1830 | tp->write_seq-tp->snd_una, |
1831 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 | 1832 | timer_active, |
a399a805 | 1833 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1834 | icsk->icsk_retransmits, |
a7cb5a49 | 1835 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1836 | icsk->icsk_probes_out, |
1da177e4 LT |
1837 | sock_i_ino(sp), |
1838 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1839 | jiffies_to_clock_t(icsk->icsk_rto), |
1840 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 1841 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
0b6a05c1 IJ |
1842 | tp->snd_cwnd, |
1843 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh | |
1da177e4 LT |
1844 | ); |
1845 | } | |
1846 | ||
1ab1457c | 1847 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1848 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1849 | { |
b71d1d42 | 1850 | const struct in6_addr *dest, *src; |
1da177e4 | 1851 | __u16 destp, srcp; |
cf533ea5 | 1852 | const struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
a399a805 | 1853 | long delta = tw->tw_ttd - jiffies; |
1da177e4 | 1854 | |
0fa1a53e ACM |
1855 | dest = &tw6->tw_v6_daddr; |
1856 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
1857 | destp = ntohs(tw->tw_dport); |
1858 | srcp = ntohs(tw->tw_sport); | |
1859 | ||
1860 | seq_printf(seq, | |
1861 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1862 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1863 | i, |
1864 | src->s6_addr32[0], src->s6_addr32[1], | |
1865 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1866 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1867 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1868 | tw->tw_substate, 0, 0, | |
a399a805 | 1869 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
1da177e4 LT |
1870 | atomic_read(&tw->tw_refcnt), tw); |
1871 | } | |
1872 | ||
1da177e4 LT |
1873 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1874 | { | |
1875 | struct tcp_iter_state *st; | |
1876 | ||
1877 | if (v == SEQ_START_TOKEN) { | |
1878 | seq_puts(seq, | |
1879 | " sl " | |
1880 | "local_address " | |
1881 | "remote_address " | |
1882 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1883 | " uid timeout inode\n"); | |
1884 | goto out; | |
1885 | } | |
1886 | st = seq->private; | |
1887 | ||
1888 | switch (st->state) { | |
1889 | case TCP_SEQ_STATE_LISTENING: | |
1890 | case TCP_SEQ_STATE_ESTABLISHED: | |
1891 | get_tcp6_sock(seq, v, st->num); | |
1892 | break; | |
1893 | case TCP_SEQ_STATE_OPENREQ: | |
1894 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
1895 | break; | |
1896 | case TCP_SEQ_STATE_TIME_WAIT: | |
1897 | get_timewait6_sock(seq, v, st->num); | |
1898 | break; | |
1899 | } | |
1900 | out: | |
1901 | return 0; | |
1902 | } | |
1903 | ||
73cb88ec AV |
1904 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1905 | .owner = THIS_MODULE, | |
1906 | .open = tcp_seq_open, | |
1907 | .read = seq_read, | |
1908 | .llseek = seq_lseek, | |
1909 | .release = seq_release_net | |
1910 | }; | |
1911 | ||
1da177e4 | 1912 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1913 | .name = "tcp6", |
1914 | .family = AF_INET6, | |
73cb88ec | 1915 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
1916 | .seq_ops = { |
1917 | .show = tcp6_seq_show, | |
1918 | }, | |
1da177e4 LT |
1919 | }; |
1920 | ||
2c8c1e72 | 1921 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1922 | { |
6f8b13bc | 1923 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1924 | } |
1925 | ||
6f8b13bc | 1926 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1927 | { |
6f8b13bc | 1928 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1929 | } |
1930 | #endif | |
1931 | ||
1932 | struct proto tcpv6_prot = { | |
1933 | .name = "TCPv6", | |
1934 | .owner = THIS_MODULE, | |
1935 | .close = tcp_close, | |
1936 | .connect = tcp_v6_connect, | |
1937 | .disconnect = tcp_disconnect, | |
463c84b9 | 1938 | .accept = inet_csk_accept, |
1da177e4 LT |
1939 | .ioctl = tcp_ioctl, |
1940 | .init = tcp_v6_init_sock, | |
1941 | .destroy = tcp_v6_destroy_sock, | |
1942 | .shutdown = tcp_shutdown, | |
1943 | .setsockopt = tcp_setsockopt, | |
1944 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 1945 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
1946 | .sendmsg = tcp_sendmsg, |
1947 | .sendpage = tcp_sendpage, | |
1da177e4 | 1948 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 1949 | .release_cb = tcp_release_cb, |
563d34d0 | 1950 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 | 1951 | .hash = tcp_v6_hash, |
ab1e0a13 ACM |
1952 | .unhash = inet_unhash, |
1953 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
1954 | .enter_memory_pressure = tcp_enter_memory_pressure, |
1955 | .sockets_allocated = &tcp_sockets_allocated, | |
1956 | .memory_allocated = &tcp_memory_allocated, | |
1957 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1958 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
1959 | .sysctl_wmem = sysctl_tcp_wmem, |
1960 | .sysctl_rmem = sysctl_tcp_rmem, | |
1961 | .max_header = MAX_TCP_HEADER, | |
1962 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 1963 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 1964 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1965 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 1966 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 1967 | .no_autobind = true, |
543d9cfe ACM |
1968 | #ifdef CONFIG_COMPAT |
1969 | .compat_setsockopt = compat_tcp_setsockopt, | |
1970 | .compat_getsockopt = compat_tcp_getsockopt, | |
1971 | #endif | |
c255a458 | 1972 | #ifdef CONFIG_MEMCG_KMEM |
d1a4c0b3 GC |
1973 | .proto_cgroup = tcp_proto_cgroup, |
1974 | #endif | |
1da177e4 LT |
1975 | }; |
1976 | ||
41135cc8 | 1977 | static const struct inet6_protocol tcpv6_protocol = { |
c7109986 | 1978 | .early_demux = tcp_v6_early_demux, |
1da177e4 LT |
1979 | .handler = tcp_v6_rcv, |
1980 | .err_handler = tcp_v6_err, | |
1981 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1982 | }; | |
1983 | ||
1da177e4 LT |
1984 | static struct inet_protosw tcpv6_protosw = { |
1985 | .type = SOCK_STREAM, | |
1986 | .protocol = IPPROTO_TCP, | |
1987 | .prot = &tcpv6_prot, | |
1988 | .ops = &inet6_stream_ops, | |
1da177e4 | 1989 | .no_check = 0, |
d83d8461 ACM |
1990 | .flags = INET_PROTOSW_PERMANENT | |
1991 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
1992 | }; |
1993 | ||
2c8c1e72 | 1994 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 1995 | { |
5677242f DL |
1996 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
1997 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
1998 | } |
1999 | ||
2c8c1e72 | 2000 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 2001 | { |
5677242f | 2002 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
2003 | } |
2004 | ||
2c8c1e72 | 2005 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
2006 | { |
2007 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
2008 | } |
2009 | ||
2010 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
2011 | .init = tcpv6_net_init, |
2012 | .exit = tcpv6_net_exit, | |
2013 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
2014 | }; |
2015 | ||
7f4e4868 | 2016 | int __init tcpv6_init(void) |
1da177e4 | 2017 | { |
7f4e4868 DL |
2018 | int ret; |
2019 | ||
3336288a VY |
2020 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
2021 | if (ret) | |
c6b641a4 | 2022 | goto out; |
3336288a | 2023 | |
1da177e4 | 2024 | /* register inet6 protocol */ |
7f4e4868 DL |
2025 | ret = inet6_register_protosw(&tcpv6_protosw); |
2026 | if (ret) | |
2027 | goto out_tcpv6_protocol; | |
2028 | ||
93ec926b | 2029 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2030 | if (ret) |
2031 | goto out_tcpv6_protosw; | |
2032 | out: | |
2033 | return ret; | |
ae0f7d5f | 2034 | |
7f4e4868 DL |
2035 | out_tcpv6_protosw: |
2036 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
2037 | out_tcpv6_protocol: |
2038 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
2039 | goto out; |
2040 | } | |
2041 | ||
09f7709f | 2042 | void tcpv6_exit(void) |
7f4e4868 | 2043 | { |
93ec926b | 2044 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2045 | inet6_unregister_protosw(&tcpv6_protosw); |
2046 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2047 | } |