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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); | |
8ad50d96 | 80 | static void __tcp_v6_send_check(struct sk_buff *skb, |
b71d1d42 ED |
81 | const struct in6_addr *saddr, |
82 | const struct in6_addr *daddr); | |
1da177e4 | 83 | |
3b401a81 SH |
84 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
85 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 86 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
87 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
88 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
89 | #else |
90 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 91 | const struct in6_addr *addr) |
9501f972 YH |
92 | { |
93 | return NULL; | |
94 | } | |
a928630a | 95 | #endif |
1da177e4 | 96 | |
fae6ef87 NC |
97 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
98 | { | |
99 | struct dst_entry *dst = skb_dst(skb); | |
100 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
101 | ||
102 | dst_hold(dst); | |
103 | sk->sk_rx_dst = dst; | |
104 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
105 | if (rt->rt6i_node) | |
106 | inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum; | |
107 | } | |
108 | ||
1da177e4 LT |
109 | static void tcp_v6_hash(struct sock *sk) |
110 | { | |
111 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 112 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
113 | tcp_prot.hash(sk); |
114 | return; | |
115 | } | |
116 | local_bh_disable(); | |
9327f705 | 117 | __inet6_hash(sk, NULL); |
1da177e4 LT |
118 | local_bh_enable(); |
119 | } | |
120 | } | |
121 | ||
684f2176 | 122 | static __inline__ __sum16 tcp_v6_check(int len, |
b71d1d42 ED |
123 | const struct in6_addr *saddr, |
124 | const struct in6_addr *daddr, | |
868c86bc | 125 | __wsum base) |
1da177e4 LT |
126 | { |
127 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
128 | } | |
129 | ||
cf533ea5 | 130 | static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) |
1da177e4 | 131 | { |
0660e03f ACM |
132 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
133 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
134 | tcp_hdr(skb)->dest, |
135 | tcp_hdr(skb)->source); | |
1da177e4 LT |
136 | } |
137 | ||
1ab1457c | 138 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
139 | int addr_len) |
140 | { | |
141 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 142 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 143 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
144 | struct ipv6_pinfo *np = inet6_sk(sk); |
145 | struct tcp_sock *tp = tcp_sk(sk); | |
20c59de2 | 146 | struct in6_addr *saddr = NULL, *final_p, final; |
493f377d | 147 | struct rt6_info *rt; |
4c9483b2 | 148 | struct flowi6 fl6; |
1da177e4 LT |
149 | struct dst_entry *dst; |
150 | int addr_type; | |
151 | int err; | |
152 | ||
1ab1457c | 153 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
154 | return -EINVAL; |
155 | ||
1ab1457c | 156 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 157 | return -EAFNOSUPPORT; |
1da177e4 | 158 | |
4c9483b2 | 159 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
160 | |
161 | if (np->sndflow) { | |
4c9483b2 DM |
162 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
163 | IP6_ECN_flow_init(fl6.flowlabel); | |
164 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 165 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 166 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
1da177e4 LT |
167 | if (flowlabel == NULL) |
168 | return -EINVAL; | |
4e3fd7a0 | 169 | usin->sin6_addr = flowlabel->dst; |
1da177e4 LT |
170 | fl6_sock_release(flowlabel); |
171 | } | |
172 | } | |
173 | ||
174 | /* | |
1ab1457c YH |
175 | * connect() to INADDR_ANY means loopback (BSD'ism). |
176 | */ | |
177 | ||
178 | if(ipv6_addr_any(&usin->sin6_addr)) | |
179 | usin->sin6_addr.s6_addr[15] = 0x1; | |
1da177e4 LT |
180 | |
181 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
182 | ||
183 | if(addr_type & IPV6_ADDR_MULTICAST) | |
184 | return -ENETUNREACH; | |
185 | ||
186 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
187 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
188 | usin->sin6_scope_id) { | |
189 | /* If interface is set while binding, indices | |
190 | * must coincide. | |
191 | */ | |
192 | if (sk->sk_bound_dev_if && | |
193 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
194 | return -EINVAL; | |
195 | ||
196 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
197 | } | |
198 | ||
199 | /* Connect to link-local address requires an interface */ | |
200 | if (!sk->sk_bound_dev_if) | |
201 | return -EINVAL; | |
202 | } | |
203 | ||
204 | if (tp->rx_opt.ts_recent_stamp && | |
205 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
206 | tp->rx_opt.ts_recent = 0; | |
207 | tp->rx_opt.ts_recent_stamp = 0; | |
208 | tp->write_seq = 0; | |
209 | } | |
210 | ||
4e3fd7a0 | 211 | np->daddr = usin->sin6_addr; |
4c9483b2 | 212 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
213 | |
214 | /* | |
215 | * TCP over IPv4 | |
216 | */ | |
217 | ||
218 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 219 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
220 | struct sockaddr_in sin; |
221 | ||
222 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
223 | ||
224 | if (__ipv6_only_sock(sk)) | |
225 | return -ENETUNREACH; | |
226 | ||
227 | sin.sin_family = AF_INET; | |
228 | sin.sin_port = usin->sin6_port; | |
229 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
230 | ||
d83d8461 | 231 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 232 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
233 | #ifdef CONFIG_TCP_MD5SIG |
234 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
235 | #endif | |
1da177e4 LT |
236 | |
237 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
238 | ||
239 | if (err) { | |
d83d8461 ACM |
240 | icsk->icsk_ext_hdr_len = exthdrlen; |
241 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 242 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
243 | #ifdef CONFIG_TCP_MD5SIG |
244 | tp->af_specific = &tcp_sock_ipv6_specific; | |
245 | #endif | |
1da177e4 LT |
246 | goto failure; |
247 | } else { | |
c720c7e8 ED |
248 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
249 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, | |
250 | &np->rcv_saddr); | |
1da177e4 LT |
251 | } |
252 | ||
253 | return err; | |
254 | } | |
255 | ||
256 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
257 | saddr = &np->rcv_saddr; | |
258 | ||
4c9483b2 | 259 | fl6.flowi6_proto = IPPROTO_TCP; |
4e3fd7a0 AD |
260 | fl6.daddr = np->daddr; |
261 | fl6.saddr = saddr ? *saddr : np->saddr; | |
4c9483b2 DM |
262 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
263 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
264 | fl6.fl6_dport = usin->sin6_port; |
265 | fl6.fl6_sport = inet->inet_sport; | |
1da177e4 | 266 | |
4c9483b2 | 267 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
1da177e4 | 268 | |
4c9483b2 | 269 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 270 | |
4c9483b2 | 271 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); |
68d0c6d3 DM |
272 | if (IS_ERR(dst)) { |
273 | err = PTR_ERR(dst); | |
1da177e4 | 274 | goto failure; |
14e50e57 | 275 | } |
1da177e4 LT |
276 | |
277 | if (saddr == NULL) { | |
4c9483b2 | 278 | saddr = &fl6.saddr; |
4e3fd7a0 | 279 | np->rcv_saddr = *saddr; |
1da177e4 LT |
280 | } |
281 | ||
282 | /* set the source address */ | |
4e3fd7a0 | 283 | np->saddr = *saddr; |
c720c7e8 | 284 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 285 | |
f83ef8c0 | 286 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 287 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 288 | |
493f377d DM |
289 | rt = (struct rt6_info *) dst; |
290 | if (tcp_death_row.sysctl_tw_recycle && | |
291 | !tp->rx_opt.ts_recent_stamp && | |
81166dd6 DM |
292 | ipv6_addr_equal(&rt->rt6i_dst.addr, &np->daddr)) |
293 | tcp_fetch_timewait_stamp(sk, dst); | |
493f377d | 294 | |
d83d8461 | 295 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 296 | if (np->opt) |
d83d8461 ACM |
297 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
298 | np->opt->opt_nflen); | |
1da177e4 LT |
299 | |
300 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
301 | ||
c720c7e8 | 302 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
303 | |
304 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 305 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
306 | if (err) |
307 | goto late_failure; | |
308 | ||
309 | if (!tp->write_seq) | |
310 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
311 | np->daddr.s6_addr32, | |
c720c7e8 ED |
312 | inet->inet_sport, |
313 | inet->inet_dport); | |
1da177e4 LT |
314 | |
315 | err = tcp_connect(sk); | |
316 | if (err) | |
317 | goto late_failure; | |
318 | ||
319 | return 0; | |
320 | ||
321 | late_failure: | |
322 | tcp_set_state(sk, TCP_CLOSE); | |
323 | __sk_dst_reset(sk); | |
324 | failure: | |
c720c7e8 | 325 | inet->inet_dport = 0; |
1da177e4 LT |
326 | sk->sk_route_caps = 0; |
327 | return err; | |
328 | } | |
329 | ||
563d34d0 ED |
330 | static void tcp_v6_mtu_reduced(struct sock *sk) |
331 | { | |
332 | struct dst_entry *dst; | |
333 | ||
334 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
335 | return; | |
336 | ||
337 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
338 | if (!dst) | |
339 | return; | |
340 | ||
341 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
342 | tcp_sync_mss(sk, dst_mtu(dst)); | |
343 | tcp_simple_retransmit(sk); | |
344 | } | |
345 | } | |
346 | ||
1da177e4 | 347 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 348 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 349 | { |
b71d1d42 | 350 | const struct ipv6hdr *hdr = (const struct ipv6hdr*)skb->data; |
505cbfc5 | 351 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
352 | struct ipv6_pinfo *np; |
353 | struct sock *sk; | |
354 | int err; | |
1ab1457c | 355 | struct tcp_sock *tp; |
1da177e4 | 356 | __u32 seq; |
ca12a1a4 | 357 | struct net *net = dev_net(skb->dev); |
1da177e4 | 358 | |
ca12a1a4 | 359 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 360 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
361 | |
362 | if (sk == NULL) { | |
e41b5368 DL |
363 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
364 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
365 | return; |
366 | } | |
367 | ||
368 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 369 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
370 | return; |
371 | } | |
372 | ||
373 | bh_lock_sock(sk); | |
563d34d0 | 374 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
de0744af | 375 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
376 | |
377 | if (sk->sk_state == TCP_CLOSE) | |
378 | goto out; | |
379 | ||
e802af9c SH |
380 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
381 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
382 | goto out; | |
383 | } | |
384 | ||
1da177e4 | 385 | tp = tcp_sk(sk); |
1ab1457c | 386 | seq = ntohl(th->seq); |
1da177e4 LT |
387 | if (sk->sk_state != TCP_LISTEN && |
388 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
de0744af | 389 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
390 | goto out; |
391 | } | |
392 | ||
393 | np = inet6_sk(sk); | |
394 | ||
ec18d9a2 DM |
395 | if (type == NDISC_REDIRECT) { |
396 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
397 | ||
1ed5c48f | 398 | if (dst) |
6700c270 | 399 | dst->ops->redirect(dst, sk, skb); |
ec18d9a2 DM |
400 | } |
401 | ||
1da177e4 | 402 | if (type == ICMPV6_PKT_TOOBIG) { |
563d34d0 ED |
403 | tp->mtu_info = ntohl(info); |
404 | if (!sock_owned_by_user(sk)) | |
405 | tcp_v6_mtu_reduced(sk); | |
d013ef2a JA |
406 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
407 | &tp->tsq_flags)) | |
408 | sock_hold(sk); | |
1da177e4 LT |
409 | goto out; |
410 | } | |
411 | ||
412 | icmpv6_err_convert(type, code, &err); | |
413 | ||
60236fdd | 414 | /* Might be for an request_sock */ |
1da177e4 | 415 | switch (sk->sk_state) { |
60236fdd | 416 | struct request_sock *req, **prev; |
1da177e4 LT |
417 | case TCP_LISTEN: |
418 | if (sock_owned_by_user(sk)) | |
419 | goto out; | |
420 | ||
8129765a ACM |
421 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
422 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
423 | if (!req) |
424 | goto out; | |
425 | ||
426 | /* ICMPs are not backlogged, hence we cannot get | |
427 | * an established socket here. | |
428 | */ | |
547b792c | 429 | WARN_ON(req->sk != NULL); |
1da177e4 | 430 | |
2e6599cb | 431 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 432 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
433 | goto out; |
434 | } | |
435 | ||
463c84b9 | 436 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
437 | goto out; |
438 | ||
439 | case TCP_SYN_SENT: | |
440 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 441 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 442 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
443 | sk->sk_err = err; |
444 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
445 | ||
446 | tcp_done(sk); | |
447 | } else | |
448 | sk->sk_err_soft = err; | |
449 | goto out; | |
450 | } | |
451 | ||
452 | if (!sock_owned_by_user(sk) && np->recverr) { | |
453 | sk->sk_err = err; | |
454 | sk->sk_error_report(sk); | |
455 | } else | |
456 | sk->sk_err_soft = err; | |
457 | ||
458 | out: | |
459 | bh_unlock_sock(sk); | |
460 | sock_put(sk); | |
461 | } | |
462 | ||
463 | ||
9f10d3f6 NC |
464 | static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst, |
465 | struct flowi6 *fl6, | |
3840a06e | 466 | struct request_sock *req, |
fff32699 ED |
467 | struct request_values *rvp, |
468 | u16 queue_mapping) | |
1da177e4 | 469 | { |
ca304b61 | 470 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
471 | struct ipv6_pinfo *np = inet6_sk(sk); |
472 | struct sk_buff * skb; | |
9494218f | 473 | int err = -ENOMEM; |
1da177e4 | 474 | |
9f10d3f6 NC |
475 | /* First, grab a route. */ |
476 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL) | |
fd80eb94 | 477 | goto done; |
9494218f | 478 | |
8336886f | 479 | skb = tcp_make_synack(sk, dst, req, rvp, NULL); |
9494218f | 480 | |
1da177e4 | 481 | if (skb) { |
8ad50d96 | 482 | __tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr); |
1da177e4 | 483 | |
9f10d3f6 | 484 | fl6->daddr = treq->rmt_addr; |
fff32699 | 485 | skb_set_queue_mapping(skb, queue_mapping); |
43264e0b | 486 | err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass); |
b9df3cb8 | 487 | err = net_xmit_eval(err); |
1da177e4 LT |
488 | } |
489 | ||
490 | done: | |
1da177e4 LT |
491 | return err; |
492 | } | |
493 | ||
72659ecc OP |
494 | static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req, |
495 | struct request_values *rvp) | |
496 | { | |
9f10d3f6 NC |
497 | struct flowi6 fl6; |
498 | ||
72659ecc | 499 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); |
9f10d3f6 | 500 | return tcp_v6_send_synack(sk, NULL, &fl6, req, rvp, 0); |
72659ecc OP |
501 | } |
502 | ||
60236fdd | 503 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 504 | { |
800d55f1 | 505 | kfree_skb(inet6_rsk(req)->pktopts); |
1da177e4 LT |
506 | } |
507 | ||
cfb6eeb4 YH |
508 | #ifdef CONFIG_TCP_MD5SIG |
509 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 510 | const struct in6_addr *addr) |
cfb6eeb4 | 511 | { |
a915da9b | 512 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
513 | } |
514 | ||
515 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
516 | struct sock *addr_sk) | |
517 | { | |
518 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); | |
519 | } | |
520 | ||
521 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
522 | struct request_sock *req) | |
523 | { | |
524 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
525 | } | |
526 | ||
cfb6eeb4 YH |
527 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, |
528 | int optlen) | |
529 | { | |
530 | struct tcp_md5sig cmd; | |
531 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
532 | |
533 | if (optlen < sizeof(cmd)) | |
534 | return -EINVAL; | |
535 | ||
536 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
537 | return -EFAULT; | |
538 | ||
539 | if (sin6->sin6_family != AF_INET6) | |
540 | return -EINVAL; | |
541 | ||
542 | if (!cmd.tcpm_keylen) { | |
e773e4fa | 543 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b ED |
544 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
545 | AF_INET); | |
546 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, | |
547 | AF_INET6); | |
cfb6eeb4 YH |
548 | } |
549 | ||
550 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
551 | return -EINVAL; | |
552 | ||
a915da9b ED |
553 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
554 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
555 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 | 556 | |
a915da9b ED |
557 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
558 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
559 | } |
560 | ||
49a72dfb | 561 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
b71d1d42 ED |
562 | const struct in6_addr *daddr, |
563 | const struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 564 | { |
cfb6eeb4 | 565 | struct tcp6_pseudohdr *bp; |
49a72dfb | 566 | struct scatterlist sg; |
8d26d76d | 567 | |
cfb6eeb4 | 568 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 | 569 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
570 | bp->saddr = *saddr; |
571 | bp->daddr = *daddr; | |
49a72dfb | 572 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 573 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 574 | |
49a72dfb AL |
575 | sg_init_one(&sg, bp, sizeof(*bp)); |
576 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
577 | } | |
c7da57a1 | 578 | |
49a72dfb | 579 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
b71d1d42 | 580 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 581 | const struct tcphdr *th) |
49a72dfb AL |
582 | { |
583 | struct tcp_md5sig_pool *hp; | |
584 | struct hash_desc *desc; | |
585 | ||
586 | hp = tcp_get_md5sig_pool(); | |
587 | if (!hp) | |
588 | goto clear_hash_noput; | |
589 | desc = &hp->md5_desc; | |
590 | ||
591 | if (crypto_hash_init(desc)) | |
592 | goto clear_hash; | |
593 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
594 | goto clear_hash; | |
595 | if (tcp_md5_hash_header(hp, th)) | |
596 | goto clear_hash; | |
597 | if (tcp_md5_hash_key(hp, key)) | |
598 | goto clear_hash; | |
599 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 600 | goto clear_hash; |
cfb6eeb4 | 601 | |
cfb6eeb4 | 602 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 603 | return 0; |
49a72dfb | 604 | |
cfb6eeb4 YH |
605 | clear_hash: |
606 | tcp_put_md5sig_pool(); | |
607 | clear_hash_noput: | |
608 | memset(md5_hash, 0, 16); | |
49a72dfb | 609 | return 1; |
cfb6eeb4 YH |
610 | } |
611 | ||
49a72dfb | 612 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
318cf7aa ED |
613 | const struct sock *sk, |
614 | const struct request_sock *req, | |
615 | const struct sk_buff *skb) | |
cfb6eeb4 | 616 | { |
b71d1d42 | 617 | const struct in6_addr *saddr, *daddr; |
49a72dfb AL |
618 | struct tcp_md5sig_pool *hp; |
619 | struct hash_desc *desc; | |
318cf7aa | 620 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
621 | |
622 | if (sk) { | |
623 | saddr = &inet6_sk(sk)->saddr; | |
624 | daddr = &inet6_sk(sk)->daddr; | |
49a72dfb | 625 | } else if (req) { |
cfb6eeb4 YH |
626 | saddr = &inet6_rsk(req)->loc_addr; |
627 | daddr = &inet6_rsk(req)->rmt_addr; | |
49a72dfb | 628 | } else { |
b71d1d42 | 629 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
630 | saddr = &ip6h->saddr; |
631 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 632 | } |
49a72dfb AL |
633 | |
634 | hp = tcp_get_md5sig_pool(); | |
635 | if (!hp) | |
636 | goto clear_hash_noput; | |
637 | desc = &hp->md5_desc; | |
638 | ||
639 | if (crypto_hash_init(desc)) | |
640 | goto clear_hash; | |
641 | ||
642 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
643 | goto clear_hash; | |
644 | if (tcp_md5_hash_header(hp, th)) | |
645 | goto clear_hash; | |
646 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
647 | goto clear_hash; | |
648 | if (tcp_md5_hash_key(hp, key)) | |
649 | goto clear_hash; | |
650 | if (crypto_hash_final(desc, md5_hash)) | |
651 | goto clear_hash; | |
652 | ||
653 | tcp_put_md5sig_pool(); | |
654 | return 0; | |
655 | ||
656 | clear_hash: | |
657 | tcp_put_md5sig_pool(); | |
658 | clear_hash_noput: | |
659 | memset(md5_hash, 0, 16); | |
660 | return 1; | |
cfb6eeb4 YH |
661 | } |
662 | ||
318cf7aa | 663 | static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
cfb6eeb4 | 664 | { |
cf533ea5 | 665 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 666 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 667 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 668 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 669 | int genhash; |
cfb6eeb4 YH |
670 | u8 newhash[16]; |
671 | ||
672 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 673 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 674 | |
785957d3 DM |
675 | /* We've parsed the options - do we have a hash? */ |
676 | if (!hash_expected && !hash_location) | |
677 | return 0; | |
678 | ||
679 | if (hash_expected && !hash_location) { | |
680 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
681 | return 1; |
682 | } | |
683 | ||
785957d3 DM |
684 | if (!hash_expected && hash_location) { |
685 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
686 | return 1; |
687 | } | |
688 | ||
689 | /* check the signature */ | |
49a72dfb AL |
690 | genhash = tcp_v6_md5_hash_skb(newhash, |
691 | hash_expected, | |
692 | NULL, NULL, skb); | |
693 | ||
cfb6eeb4 | 694 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
e87cc472 JP |
695 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
696 | genhash ? "failed" : "mismatch", | |
697 | &ip6h->saddr, ntohs(th->source), | |
698 | &ip6h->daddr, ntohs(th->dest)); | |
cfb6eeb4 YH |
699 | return 1; |
700 | } | |
701 | return 0; | |
702 | } | |
703 | #endif | |
704 | ||
c6aefafb | 705 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 706 | .family = AF_INET6, |
2e6599cb | 707 | .obj_size = sizeof(struct tcp6_request_sock), |
72659ecc | 708 | .rtx_syn_ack = tcp_v6_rtx_synack, |
60236fdd ACM |
709 | .send_ack = tcp_v6_reqsk_send_ack, |
710 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc OP |
711 | .send_reset = tcp_v6_send_reset, |
712 | .syn_ack_timeout = tcp_syn_ack_timeout, | |
1da177e4 LT |
713 | }; |
714 | ||
cfb6eeb4 | 715 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 716 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 717 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 718 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 719 | }; |
b6332e6c | 720 | #endif |
cfb6eeb4 | 721 | |
8ad50d96 | 722 | static void __tcp_v6_send_check(struct sk_buff *skb, |
b71d1d42 | 723 | const struct in6_addr *saddr, const struct in6_addr *daddr) |
1da177e4 | 724 | { |
aa8223c7 | 725 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 726 | |
84fa7933 | 727 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
8ad50d96 | 728 | th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0); |
663ead3b | 729 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 730 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 731 | } else { |
8ad50d96 HX |
732 | th->check = tcp_v6_check(skb->len, saddr, daddr, |
733 | csum_partial(th, th->doff << 2, | |
734 | skb->csum)); | |
1da177e4 LT |
735 | } |
736 | } | |
737 | ||
bb296246 | 738 | static void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
8ad50d96 HX |
739 | { |
740 | struct ipv6_pinfo *np = inet6_sk(sk); | |
741 | ||
742 | __tcp_v6_send_check(skb, &np->saddr, &np->daddr); | |
743 | } | |
744 | ||
a430a43d HX |
745 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
746 | { | |
b71d1d42 | 747 | const struct ipv6hdr *ipv6h; |
a430a43d HX |
748 | struct tcphdr *th; |
749 | ||
750 | if (!pskb_may_pull(skb, sizeof(*th))) | |
751 | return -EINVAL; | |
752 | ||
0660e03f | 753 | ipv6h = ipv6_hdr(skb); |
aa8223c7 | 754 | th = tcp_hdr(skb); |
a430a43d HX |
755 | |
756 | th->check = 0; | |
84fa7933 | 757 | skb->ip_summed = CHECKSUM_PARTIAL; |
8ad50d96 | 758 | __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr); |
a430a43d HX |
759 | return 0; |
760 | } | |
1da177e4 | 761 | |
36990673 HX |
762 | static struct sk_buff **tcp6_gro_receive(struct sk_buff **head, |
763 | struct sk_buff *skb) | |
684f2176 | 764 | { |
b71d1d42 | 765 | const struct ipv6hdr *iph = skb_gro_network_header(skb); |
861b6501 ED |
766 | __wsum wsum; |
767 | __sum16 sum; | |
684f2176 HX |
768 | |
769 | switch (skb->ip_summed) { | |
770 | case CHECKSUM_COMPLETE: | |
86911732 | 771 | if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr, |
684f2176 HX |
772 | skb->csum)) { |
773 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
774 | break; | |
775 | } | |
861b6501 | 776 | flush: |
684f2176 HX |
777 | NAPI_GRO_CB(skb)->flush = 1; |
778 | return NULL; | |
861b6501 ED |
779 | |
780 | case CHECKSUM_NONE: | |
781 | wsum = ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr, | |
782 | skb_gro_len(skb), | |
783 | IPPROTO_TCP, 0)); | |
784 | sum = csum_fold(skb_checksum(skb, | |
785 | skb_gro_offset(skb), | |
786 | skb_gro_len(skb), | |
787 | wsum)); | |
788 | if (sum) | |
789 | goto flush; | |
790 | ||
791 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
792 | break; | |
684f2176 HX |
793 | } |
794 | ||
795 | return tcp_gro_receive(head, skb); | |
796 | } | |
684f2176 | 797 | |
36990673 | 798 | static int tcp6_gro_complete(struct sk_buff *skb) |
684f2176 | 799 | { |
b71d1d42 | 800 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
684f2176 HX |
801 | struct tcphdr *th = tcp_hdr(skb); |
802 | ||
803 | th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb), | |
804 | &iph->saddr, &iph->daddr, 0); | |
805 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
806 | ||
807 | return tcp_gro_complete(skb); | |
808 | } | |
684f2176 | 809 | |
626e264d | 810 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
b903d324 | 811 | u32 ts, struct tcp_md5sig_key *key, int rst, u8 tclass) |
1da177e4 | 812 | { |
cf533ea5 ED |
813 | const struct tcphdr *th = tcp_hdr(skb); |
814 | struct tcphdr *t1; | |
1da177e4 | 815 | struct sk_buff *buff; |
4c9483b2 | 816 | struct flowi6 fl6; |
adf30907 | 817 | struct net *net = dev_net(skb_dst(skb)->dev); |
e5047992 | 818 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 819 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 820 | struct dst_entry *dst; |
81ada62d | 821 | __be32 *topt; |
1da177e4 | 822 | |
626e264d IJ |
823 | if (ts) |
824 | tot_len += TCPOLEN_TSTAMP_ALIGNED; | |
cfb6eeb4 | 825 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
826 | if (key) |
827 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
828 | #endif | |
829 | ||
cfb6eeb4 | 830 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 831 | GFP_ATOMIC); |
1ab1457c YH |
832 | if (buff == NULL) |
833 | return; | |
1da177e4 | 834 | |
cfb6eeb4 | 835 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 836 | |
cfb6eeb4 | 837 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 838 | skb_reset_transport_header(buff); |
1da177e4 LT |
839 | |
840 | /* Swap the send and the receive. */ | |
841 | memset(t1, 0, sizeof(*t1)); | |
842 | t1->dest = th->source; | |
843 | t1->source = th->dest; | |
cfb6eeb4 | 844 | t1->doff = tot_len / 4; |
626e264d IJ |
845 | t1->seq = htonl(seq); |
846 | t1->ack_seq = htonl(ack); | |
847 | t1->ack = !rst || !th->ack; | |
848 | t1->rst = rst; | |
849 | t1->window = htons(win); | |
1da177e4 | 850 | |
81ada62d IJ |
851 | topt = (__be32 *)(t1 + 1); |
852 | ||
626e264d IJ |
853 | if (ts) { |
854 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
855 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
856 | *topt++ = htonl(tcp_time_stamp); | |
857 | *topt++ = htonl(ts); | |
858 | } | |
859 | ||
cfb6eeb4 YH |
860 | #ifdef CONFIG_TCP_MD5SIG |
861 | if (key) { | |
81ada62d IJ |
862 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
863 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
864 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
865 | &ipv6_hdr(skb)->saddr, |
866 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
867 | } |
868 | #endif | |
869 | ||
4c9483b2 | 870 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
871 | fl6.daddr = ipv6_hdr(skb)->saddr; |
872 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1da177e4 | 873 | |
e5700aff DM |
874 | buff->ip_summed = CHECKSUM_PARTIAL; |
875 | buff->csum = 0; | |
876 | ||
4c9483b2 | 877 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 878 | |
4c9483b2 | 879 | fl6.flowi6_proto = IPPROTO_TCP; |
4c675258 AK |
880 | if (ipv6_addr_type(&fl6.daddr) & IPV6_ADDR_LINKLOCAL) |
881 | fl6.flowi6_oif = inet6_iif(skb); | |
1958b856 DM |
882 | fl6.fl6_dport = t1->dest; |
883 | fl6.fl6_sport = t1->source; | |
4c9483b2 | 884 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 885 | |
c20121ae DL |
886 | /* Pass a socket to ip6_dst_lookup either it is for RST |
887 | * Underlying function will use this to retrieve the network | |
888 | * namespace | |
889 | */ | |
4c9483b2 | 890 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false); |
68d0c6d3 DM |
891 | if (!IS_ERR(dst)) { |
892 | skb_dst_set(buff, dst); | |
b903d324 | 893 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
68d0c6d3 DM |
894 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
895 | if (rst) | |
896 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
897 | return; | |
1da177e4 LT |
898 | } |
899 | ||
900 | kfree_skb(buff); | |
901 | } | |
902 | ||
626e264d | 903 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 904 | { |
cf533ea5 | 905 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 906 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 907 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
908 | #ifdef CONFIG_TCP_MD5SIG |
909 | const __u8 *hash_location = NULL; | |
910 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
911 | unsigned char newhash[16]; | |
912 | int genhash; | |
913 | struct sock *sk1 = NULL; | |
914 | #endif | |
1da177e4 | 915 | |
626e264d | 916 | if (th->rst) |
1da177e4 LT |
917 | return; |
918 | ||
626e264d IJ |
919 | if (!ipv6_unicast_destination(skb)) |
920 | return; | |
1da177e4 | 921 | |
cfb6eeb4 | 922 | #ifdef CONFIG_TCP_MD5SIG |
658ddaaf SL |
923 | hash_location = tcp_parse_md5sig_option(th); |
924 | if (!sk && hash_location) { | |
925 | /* | |
926 | * active side is lost. Try to find listening socket through | |
927 | * source port, and then find md5 key through listening socket. | |
928 | * we are not loose security here: | |
929 | * Incoming packet is checked with md5 hash with finding key, | |
930 | * no RST generated if md5 hash doesn't match. | |
931 | */ | |
932 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
933 | &tcp_hashinfo, &ipv6h->daddr, | |
934 | ntohs(th->source), inet6_iif(skb)); | |
935 | if (!sk1) | |
936 | return; | |
937 | ||
938 | rcu_read_lock(); | |
939 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); | |
940 | if (!key) | |
941 | goto release_sk1; | |
942 | ||
943 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb); | |
944 | if (genhash || memcmp(hash_location, newhash, 16) != 0) | |
945 | goto release_sk1; | |
946 | } else { | |
947 | key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; | |
948 | } | |
cfb6eeb4 YH |
949 | #endif |
950 | ||
626e264d IJ |
951 | if (th->ack) |
952 | seq = ntohl(th->ack_seq); | |
953 | else | |
954 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
955 | (th->doff << 2); | |
1da177e4 | 956 | |
b903d324 | 957 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1, 0); |
658ddaaf SL |
958 | |
959 | #ifdef CONFIG_TCP_MD5SIG | |
960 | release_sk1: | |
961 | if (sk1) { | |
962 | rcu_read_unlock(); | |
963 | sock_put(sk1); | |
964 | } | |
965 | #endif | |
626e264d | 966 | } |
1da177e4 | 967 | |
626e264d | 968 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts, |
b903d324 | 969 | struct tcp_md5sig_key *key, u8 tclass) |
626e264d | 970 | { |
b903d324 | 971 | tcp_v6_send_response(skb, seq, ack, win, ts, key, 0, tclass); |
1da177e4 LT |
972 | } |
973 | ||
974 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
975 | { | |
8feaf0c0 | 976 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 977 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 978 | |
9501f972 | 979 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 980 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
b903d324 ED |
981 | tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw), |
982 | tw->tw_tclass); | |
1da177e4 | 983 | |
8feaf0c0 | 984 | inet_twsk_put(tw); |
1da177e4 LT |
985 | } |
986 | ||
6edafaaf GJ |
987 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
988 | struct request_sock *req) | |
1da177e4 | 989 | { |
9501f972 | 990 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent, |
b903d324 | 991 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), 0); |
1da177e4 LT |
992 | } |
993 | ||
994 | ||
995 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
996 | { | |
60236fdd | 997 | struct request_sock *req, **prev; |
aa8223c7 | 998 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
999 | struct sock *nsk; |
1000 | ||
1001 | /* Find possible connection requests. */ | |
8129765a | 1002 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
1003 | &ipv6_hdr(skb)->saddr, |
1004 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 | 1005 | if (req) |
8336886f | 1006 | return tcp_check_req(sk, skb, req, prev, false); |
1da177e4 | 1007 | |
3b1e0a65 | 1008 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
1009 | &ipv6_hdr(skb)->saddr, th->source, |
1010 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
1011 | |
1012 | if (nsk) { | |
1013 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1014 | bh_lock_sock(nsk); | |
1015 | return nsk; | |
1016 | } | |
9469c7b4 | 1017 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1018 | return NULL; |
1019 | } | |
1020 | ||
c6aefafb | 1021 | #ifdef CONFIG_SYN_COOKIES |
af9b4738 | 1022 | if (!th->syn) |
c6aefafb | 1023 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1024 | #endif |
1025 | return sk; | |
1026 | } | |
1027 | ||
1da177e4 LT |
1028 | /* FIXME: this is substantially similar to the ipv4 code. |
1029 | * Can some kind of merge be done? -- erics | |
1030 | */ | |
1031 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1032 | { | |
4957faad | 1033 | struct tcp_extend_values tmp_ext; |
e6b4d113 | 1034 | struct tcp_options_received tmp_opt; |
cf533ea5 | 1035 | const u8 *hash_location; |
e6b4d113 | 1036 | struct request_sock *req; |
ca304b61 | 1037 | struct inet6_request_sock *treq; |
1da177e4 | 1038 | struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 | 1039 | struct tcp_sock *tp = tcp_sk(sk); |
e6b4d113 | 1040 | __u32 isn = TCP_SKB_CB(skb)->when; |
493f377d | 1041 | struct dst_entry *dst = NULL; |
3840a06e | 1042 | struct flowi6 fl6; |
a2a385d6 | 1043 | bool want_cookie = false; |
1da177e4 LT |
1044 | |
1045 | if (skb->protocol == htons(ETH_P_IP)) | |
1046 | return tcp_v4_conn_request(sk, skb); | |
1047 | ||
1048 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1049 | goto drop; |
1da177e4 | 1050 | |
463c84b9 | 1051 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
946cedcc ED |
1052 | want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6"); |
1053 | if (!want_cookie) | |
1054 | goto drop; | |
1da177e4 LT |
1055 | } |
1056 | ||
463c84b9 | 1057 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1058 | goto drop; |
1059 | ||
ca304b61 | 1060 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1061 | if (req == NULL) |
1062 | goto drop; | |
1063 | ||
cfb6eeb4 YH |
1064 | #ifdef CONFIG_TCP_MD5SIG |
1065 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
1066 | #endif | |
1067 | ||
1da177e4 LT |
1068 | tcp_clear_options(&tmp_opt); |
1069 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1070 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
2100c8d2 | 1071 | tcp_parse_options(skb, &tmp_opt, &hash_location, 0, NULL); |
4957faad WAS |
1072 | |
1073 | if (tmp_opt.cookie_plus > 0 && | |
1074 | tmp_opt.saw_tstamp && | |
1075 | !tp->rx_opt.cookie_out_never && | |
1076 | (sysctl_tcp_cookie_size > 0 || | |
1077 | (tp->cookie_values != NULL && | |
1078 | tp->cookie_values->cookie_desired > 0))) { | |
1079 | u8 *c; | |
1080 | u32 *d; | |
1081 | u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS]; | |
1082 | int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE; | |
1083 | ||
1084 | if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0) | |
1085 | goto drop_and_free; | |
1086 | ||
1087 | /* Secret recipe starts with IP addresses */ | |
0eae88f3 | 1088 | d = (__force u32 *)&ipv6_hdr(skb)->daddr.s6_addr32[0]; |
4957faad WAS |
1089 | *mess++ ^= *d++; |
1090 | *mess++ ^= *d++; | |
1091 | *mess++ ^= *d++; | |
1092 | *mess++ ^= *d++; | |
0eae88f3 | 1093 | d = (__force u32 *)&ipv6_hdr(skb)->saddr.s6_addr32[0]; |
4957faad WAS |
1094 | *mess++ ^= *d++; |
1095 | *mess++ ^= *d++; | |
1096 | *mess++ ^= *d++; | |
1097 | *mess++ ^= *d++; | |
1098 | ||
1099 | /* plus variable length Initiator Cookie */ | |
1100 | c = (u8 *)mess; | |
1101 | while (l-- > 0) | |
1102 | *c++ ^= *hash_location++; | |
1da177e4 | 1103 | |
a2a385d6 | 1104 | want_cookie = false; /* not our kind of cookie */ |
4957faad WAS |
1105 | tmp_ext.cookie_out_never = 0; /* false */ |
1106 | tmp_ext.cookie_plus = tmp_opt.cookie_plus; | |
1107 | } else if (!tp->rx_opt.cookie_in_always) { | |
1108 | /* redundant indications, but ensure initialization. */ | |
1109 | tmp_ext.cookie_out_never = 1; /* true */ | |
1110 | tmp_ext.cookie_plus = 0; | |
1111 | } else { | |
1112 | goto drop_and_free; | |
1113 | } | |
1114 | tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always; | |
1da177e4 | 1115 | |
4dfc2817 | 1116 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 1117 | tcp_clear_options(&tmp_opt); |
c6aefafb | 1118 | |
1da177e4 LT |
1119 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1120 | tcp_openreq_init(req, &tmp_opt, skb); | |
1121 | ||
ca304b61 | 1122 | treq = inet6_rsk(req); |
4e3fd7a0 AD |
1123 | treq->rmt_addr = ipv6_hdr(skb)->saddr; |
1124 | treq->loc_addr = ipv6_hdr(skb)->daddr; | |
172d69e6 | 1125 | if (!want_cookie || tmp_opt.tstamp_ok) |
bd14b1b2 | 1126 | TCP_ECN_create_request(req, skb); |
c6aefafb | 1127 | |
4d0fe50c ED |
1128 | treq->iif = sk->sk_bound_dev_if; |
1129 | ||
1130 | /* So that link locals have meaning */ | |
1131 | if (!sk->sk_bound_dev_if && | |
1132 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1133 | treq->iif = inet6_iif(skb); | |
1134 | ||
2bbdf389 | 1135 | if (!isn) { |
c6aefafb GG |
1136 | if (ipv6_opt_accepted(sk, skb) || |
1137 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1138 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1139 | atomic_inc(&skb->users); | |
1140 | treq->pktopts = skb; | |
1141 | } | |
493f377d DM |
1142 | |
1143 | if (want_cookie) { | |
2bbdf389 FW |
1144 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); |
1145 | req->cookie_ts = tmp_opt.tstamp_ok; | |
493f377d DM |
1146 | goto have_isn; |
1147 | } | |
1148 | ||
1149 | /* VJ's idea. We save last timestamp seen | |
1150 | * from the destination in peer table, when entering | |
1151 | * state TIME-WAIT, and check against it before | |
1152 | * accepting new connection request. | |
1153 | * | |
1154 | * If "isn" is not zero, this request hit alive | |
1155 | * timewait bucket, so that all the necessary checks | |
1156 | * are made in the function processing timewait state. | |
1157 | */ | |
1158 | if (tmp_opt.saw_tstamp && | |
1159 | tcp_death_row.sysctl_tw_recycle && | |
81166dd6 DM |
1160 | (dst = inet6_csk_route_req(sk, &fl6, req)) != NULL) { |
1161 | if (!tcp_peer_is_proven(req, dst, true)) { | |
493f377d DM |
1162 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); |
1163 | goto drop_and_release; | |
1164 | } | |
1165 | } | |
1166 | /* Kill the following clause, if you dislike this way. */ | |
1167 | else if (!sysctl_tcp_syncookies && | |
1168 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < | |
1169 | (sysctl_max_syn_backlog >> 2)) && | |
81166dd6 | 1170 | !tcp_peer_is_proven(req, dst, false)) { |
493f377d DM |
1171 | /* Without syncookies last quarter of |
1172 | * backlog is filled with destinations, | |
1173 | * proven to be alive. | |
1174 | * It means that we continue to communicate | |
1175 | * to destinations, already remembered | |
1176 | * to the moment of synflood. | |
1177 | */ | |
1178 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n", | |
1179 | &treq->rmt_addr, ntohs(tcp_hdr(skb)->source)); | |
1180 | goto drop_and_release; | |
2bbdf389 | 1181 | } |
493f377d DM |
1182 | |
1183 | isn = tcp_v6_init_sequence(skb); | |
c6aefafb | 1184 | } |
493f377d | 1185 | have_isn: |
2e6599cb | 1186 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1187 | |
437c5b53 NC |
1188 | if (security_inet_conn_request(sk, skb, req)) |
1189 | goto drop_and_release; | |
4237c75c | 1190 | |
9f10d3f6 | 1191 | if (tcp_v6_send_synack(sk, dst, &fl6, req, |
fff32699 ED |
1192 | (struct request_values *)&tmp_ext, |
1193 | skb_get_queue_mapping(skb)) || | |
4957faad | 1194 | want_cookie) |
e6b4d113 | 1195 | goto drop_and_free; |
1da177e4 | 1196 | |
016818d0 | 1197 | tcp_rsk(req)->snt_synack = tcp_time_stamp; |
8336886f | 1198 | tcp_rsk(req)->listener = NULL; |
e6b4d113 WAS |
1199 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1200 | return 0; | |
1da177e4 | 1201 | |
493f377d DM |
1202 | drop_and_release: |
1203 | dst_release(dst); | |
e6b4d113 WAS |
1204 | drop_and_free: |
1205 | reqsk_free(req); | |
1da177e4 | 1206 | drop: |
1da177e4 LT |
1207 | return 0; /* don't send reset */ |
1208 | } | |
1209 | ||
1210 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1211 | struct request_sock *req, |
1da177e4 LT |
1212 | struct dst_entry *dst) |
1213 | { | |
78d15e82 | 1214 | struct inet6_request_sock *treq; |
1da177e4 LT |
1215 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1216 | struct tcp6_sock *newtcp6sk; | |
1217 | struct inet_sock *newinet; | |
1218 | struct tcp_sock *newtp; | |
1219 | struct sock *newsk; | |
cfb6eeb4 YH |
1220 | #ifdef CONFIG_TCP_MD5SIG |
1221 | struct tcp_md5sig_key *key; | |
1222 | #endif | |
3840a06e | 1223 | struct flowi6 fl6; |
1da177e4 LT |
1224 | |
1225 | if (skb->protocol == htons(ETH_P_IP)) { | |
1226 | /* | |
1227 | * v6 mapped | |
1228 | */ | |
1229 | ||
1230 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1231 | ||
1ab1457c | 1232 | if (newsk == NULL) |
1da177e4 LT |
1233 | return NULL; |
1234 | ||
1235 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1236 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1237 | ||
1238 | newinet = inet_sk(newsk); | |
1239 | newnp = inet6_sk(newsk); | |
1240 | newtp = tcp_sk(newsk); | |
1241 | ||
1242 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1243 | ||
c720c7e8 | 1244 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); |
1da177e4 | 1245 | |
c720c7e8 | 1246 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 | 1247 | |
4e3fd7a0 | 1248 | newnp->rcv_saddr = newnp->saddr; |
1da177e4 | 1249 | |
8292a17a | 1250 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1251 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1252 | #ifdef CONFIG_TCP_MD5SIG |
1253 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1254 | #endif | |
1255 | ||
676a1184 YZ |
1256 | newnp->ipv6_ac_list = NULL; |
1257 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1258 | newnp->pktoptions = NULL; |
1259 | newnp->opt = NULL; | |
505cbfc5 | 1260 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1261 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
4c507d28 | 1262 | newnp->rcv_tclass = ipv6_tclass(ipv6_hdr(skb)); |
1da177e4 | 1263 | |
e6848976 ACM |
1264 | /* |
1265 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1266 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1267 | * that function for the gory details. -acme | |
1da177e4 | 1268 | */ |
1da177e4 LT |
1269 | |
1270 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1271 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1272 | Sync it now. |
1273 | */ | |
d83d8461 | 1274 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1275 | |
1276 | return newsk; | |
1277 | } | |
1278 | ||
78d15e82 | 1279 | treq = inet6_rsk(req); |
1da177e4 LT |
1280 | |
1281 | if (sk_acceptq_is_full(sk)) | |
1282 | goto out_overflow; | |
1283 | ||
493f377d | 1284 | if (!dst) { |
3840a06e | 1285 | dst = inet6_csk_route_req(sk, &fl6, req); |
493f377d | 1286 | if (!dst) |
1da177e4 | 1287 | goto out; |
1ab1457c | 1288 | } |
1da177e4 LT |
1289 | |
1290 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1291 | if (newsk == NULL) | |
093d2823 | 1292 | goto out_nonewsk; |
1da177e4 | 1293 | |
e6848976 ACM |
1294 | /* |
1295 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1296 | * count here, tcp_create_openreq_child now does this for us, see the | |
1297 | * comment in that function for the gory details. -acme | |
1298 | */ | |
1da177e4 | 1299 | |
59eed279 | 1300 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1301 | __ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1302 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1303 | |
1304 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1305 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1306 | ||
1307 | newtp = tcp_sk(newsk); | |
1308 | newinet = inet_sk(newsk); | |
1309 | newnp = inet6_sk(newsk); | |
1310 | ||
1311 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1312 | ||
4e3fd7a0 AD |
1313 | newnp->daddr = treq->rmt_addr; |
1314 | newnp->saddr = treq->loc_addr; | |
1315 | newnp->rcv_saddr = treq->loc_addr; | |
2e6599cb | 1316 | newsk->sk_bound_dev_if = treq->iif; |
1da177e4 | 1317 | |
1ab1457c | 1318 | /* Now IPv6 options... |
1da177e4 LT |
1319 | |
1320 | First: no IPv4 options. | |
1321 | */ | |
f6d8bd05 | 1322 | newinet->inet_opt = NULL; |
676a1184 | 1323 | newnp->ipv6_ac_list = NULL; |
d35690be | 1324 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1325 | |
1326 | /* Clone RX bits */ | |
1327 | newnp->rxopt.all = np->rxopt.all; | |
1328 | ||
1329 | /* Clone pktoptions received with SYN */ | |
1330 | newnp->pktoptions = NULL; | |
2e6599cb | 1331 | if (treq->pktopts != NULL) { |
99a1dec7 MG |
1332 | newnp->pktoptions = skb_clone(treq->pktopts, |
1333 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
ab185d7b | 1334 | consume_skb(treq->pktopts); |
2e6599cb | 1335 | treq->pktopts = NULL; |
1da177e4 LT |
1336 | if (newnp->pktoptions) |
1337 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1338 | } | |
1339 | newnp->opt = NULL; | |
505cbfc5 | 1340 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1341 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
4c507d28 | 1342 | newnp->rcv_tclass = ipv6_tclass(ipv6_hdr(skb)); |
1da177e4 LT |
1343 | |
1344 | /* Clone native IPv6 options from listening socket (if any) | |
1345 | ||
1346 | Yes, keeping reference count would be much more clever, | |
1347 | but we make one more one thing there: reattach optmem | |
1348 | to newsk. | |
1349 | */ | |
43264e0b RL |
1350 | if (np->opt) |
1351 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
1da177e4 | 1352 | |
d83d8461 | 1353 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1354 | if (newnp->opt) |
d83d8461 ACM |
1355 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1356 | newnp->opt->opt_flen); | |
1da177e4 | 1357 | |
5d424d5a | 1358 | tcp_mtup_init(newsk); |
1da177e4 | 1359 | tcp_sync_mss(newsk, dst_mtu(dst)); |
0dbaee3b | 1360 | newtp->advmss = dst_metric_advmss(dst); |
d135c522 NC |
1361 | if (tcp_sk(sk)->rx_opt.user_mss && |
1362 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1363 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1364 | ||
1da177e4 | 1365 | tcp_initialize_rcv_mss(newsk); |
623df484 | 1366 | tcp_synack_rtt_meas(newsk, req); |
9ad7c049 | 1367 | newtp->total_retrans = req->retrans; |
1da177e4 | 1368 | |
c720c7e8 ED |
1369 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1370 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1371 | |
cfb6eeb4 YH |
1372 | #ifdef CONFIG_TCP_MD5SIG |
1373 | /* Copy over the MD5 key from the original socket */ | |
1374 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1375 | /* We're using one, so create a matching key | |
1376 | * on the newsk structure. If we fail to get | |
1377 | * memory, then we end up not copying the key | |
1378 | * across. Shucks. | |
1379 | */ | |
a915da9b | 1380 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newnp->daddr, |
99a1dec7 MG |
1381 | AF_INET6, key->key, key->keylen, |
1382 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
cfb6eeb4 YH |
1383 | } |
1384 | #endif | |
1385 | ||
093d2823 BS |
1386 | if (__inet_inherit_port(sk, newsk) < 0) { |
1387 | sock_put(newsk); | |
1388 | goto out; | |
1389 | } | |
9327f705 | 1390 | __inet6_hash(newsk, NULL); |
1da177e4 LT |
1391 | |
1392 | return newsk; | |
1393 | ||
1394 | out_overflow: | |
de0744af | 1395 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1396 | out_nonewsk: |
1da177e4 | 1397 | dst_release(dst); |
093d2823 BS |
1398 | out: |
1399 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); | |
1da177e4 LT |
1400 | return NULL; |
1401 | } | |
1402 | ||
b51655b9 | 1403 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1404 | { |
84fa7933 | 1405 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
684f2176 | 1406 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1407 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1408 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1409 | return 0; |
fb286bb2 | 1410 | } |
1da177e4 | 1411 | } |
fb286bb2 | 1412 | |
684f2176 | 1413 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
0660e03f ACM |
1414 | &ipv6_hdr(skb)->saddr, |
1415 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1416 | |
1da177e4 | 1417 | if (skb->len <= 76) { |
fb286bb2 | 1418 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1419 | } |
1420 | return 0; | |
1421 | } | |
1422 | ||
1423 | /* The socket must have it's spinlock held when we get | |
1424 | * here. | |
1425 | * | |
1426 | * We have a potential double-lock case here, so even when | |
1427 | * doing backlog processing we use the BH locking scheme. | |
1428 | * This is because we cannot sleep with the original spinlock | |
1429 | * held. | |
1430 | */ | |
1431 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1432 | { | |
1433 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1434 | struct tcp_sock *tp; | |
1435 | struct sk_buff *opt_skb = NULL; | |
1436 | ||
1437 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1438 | goes to IPv4 receive handler and backlogged. | |
1439 | From backlog it always goes here. Kerboom... | |
1440 | Fortunately, tcp_rcv_established and rcv_established | |
1441 | handle them correctly, but it is not case with | |
1442 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1443 | */ | |
1444 | ||
1445 | if (skb->protocol == htons(ETH_P_IP)) | |
1446 | return tcp_v4_do_rcv(sk, skb); | |
1447 | ||
cfb6eeb4 YH |
1448 | #ifdef CONFIG_TCP_MD5SIG |
1449 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1450 | goto discard; | |
1451 | #endif | |
1452 | ||
fda9ef5d | 1453 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1454 | goto discard; |
1455 | ||
1456 | /* | |
1457 | * socket locking is here for SMP purposes as backlog rcv | |
1458 | * is currently called with bh processing disabled. | |
1459 | */ | |
1460 | ||
1461 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1462 | ||
1463 | Yes, guys, it is the only place in our code, where we | |
1464 | may make it not affecting IPv4. | |
1465 | The rest of code is protocol independent, | |
1466 | and I do not like idea to uglify IPv4. | |
1467 | ||
1468 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1469 | looks not very well thought. For now we latch | |
1470 | options, received in the last packet, enqueued | |
1471 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1472 | --ANK (980728) |
1da177e4 LT |
1473 | */ |
1474 | if (np->rxopt.all) | |
99a1dec7 | 1475 | opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC)); |
1da177e4 LT |
1476 | |
1477 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1478 | struct dst_entry *dst = sk->sk_rx_dst; |
1479 | ||
bdeab991 | 1480 | sock_rps_save_rxhash(sk, skb); |
5d299f3d ED |
1481 | if (dst) { |
1482 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1483 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1484 | dst_release(dst); | |
1485 | sk->sk_rx_dst = NULL; | |
1486 | } | |
1487 | } | |
1488 | ||
aa8223c7 | 1489 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1490 | goto reset; |
1da177e4 LT |
1491 | if (opt_skb) |
1492 | goto ipv6_pktoptions; | |
1493 | return 0; | |
1494 | } | |
1495 | ||
ab6a5bb6 | 1496 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1497 | goto csum_err; |
1498 | ||
1ab1457c | 1499 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1500 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1501 | if (!nsk) | |
1502 | goto discard; | |
1503 | ||
1504 | /* | |
1505 | * Queue it on the new socket if the new socket is active, | |
1506 | * otherwise we just shortcircuit this and continue with | |
1507 | * the new socket.. | |
1508 | */ | |
1ab1457c | 1509 | if(nsk != sk) { |
bdeab991 | 1510 | sock_rps_save_rxhash(nsk, skb); |
1da177e4 LT |
1511 | if (tcp_child_process(sk, nsk, skb)) |
1512 | goto reset; | |
1513 | if (opt_skb) | |
1514 | __kfree_skb(opt_skb); | |
1515 | return 0; | |
1516 | } | |
47482f13 | 1517 | } else |
bdeab991 | 1518 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1519 | |
aa8223c7 | 1520 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1521 | goto reset; |
1da177e4 LT |
1522 | if (opt_skb) |
1523 | goto ipv6_pktoptions; | |
1524 | return 0; | |
1525 | ||
1526 | reset: | |
cfb6eeb4 | 1527 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1528 | discard: |
1529 | if (opt_skb) | |
1530 | __kfree_skb(opt_skb); | |
1531 | kfree_skb(skb); | |
1532 | return 0; | |
1533 | csum_err: | |
63231bdd | 1534 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1535 | goto discard; |
1536 | ||
1537 | ||
1538 | ipv6_pktoptions: | |
1539 | /* Do you ask, what is it? | |
1540 | ||
1541 | 1. skb was enqueued by tcp. | |
1542 | 2. skb is added to tail of read queue, rather than out of order. | |
1543 | 3. socket is not in passive state. | |
1544 | 4. Finally, it really contains options, which user wants to receive. | |
1545 | */ | |
1546 | tp = tcp_sk(sk); | |
1547 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1548 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1549 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1550 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1551 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1552 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
4c507d28 JB |
1553 | if (np->rxopt.bits.rxtclass) |
1554 | np->rcv_tclass = ipv6_tclass(ipv6_hdr(skb)); | |
1da177e4 LT |
1555 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1556 | skb_set_owner_r(opt_skb, sk); | |
1557 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1558 | } else { | |
1559 | __kfree_skb(opt_skb); | |
1560 | opt_skb = xchg(&np->pktoptions, NULL); | |
1561 | } | |
1562 | } | |
1563 | ||
800d55f1 | 1564 | kfree_skb(opt_skb); |
1da177e4 LT |
1565 | return 0; |
1566 | } | |
1567 | ||
e5bbef20 | 1568 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1569 | { |
cf533ea5 | 1570 | const struct tcphdr *th; |
b71d1d42 | 1571 | const struct ipv6hdr *hdr; |
1da177e4 LT |
1572 | struct sock *sk; |
1573 | int ret; | |
a86b1e30 | 1574 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1575 | |
1576 | if (skb->pkt_type != PACKET_HOST) | |
1577 | goto discard_it; | |
1578 | ||
1579 | /* | |
1580 | * Count it even if it's bad. | |
1581 | */ | |
63231bdd | 1582 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1583 | |
1584 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1585 | goto discard_it; | |
1586 | ||
aa8223c7 | 1587 | th = tcp_hdr(skb); |
1da177e4 LT |
1588 | |
1589 | if (th->doff < sizeof(struct tcphdr)/4) | |
1590 | goto bad_packet; | |
1591 | if (!pskb_may_pull(skb, th->doff*4)) | |
1592 | goto discard_it; | |
1593 | ||
60476372 | 1594 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1da177e4 LT |
1595 | goto bad_packet; |
1596 | ||
aa8223c7 | 1597 | th = tcp_hdr(skb); |
e802af9c | 1598 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
1599 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1600 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1601 | skb->len - th->doff*4); | |
1602 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1603 | TCP_SKB_CB(skb)->when = 0; | |
b82d1bb4 | 1604 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); |
1da177e4 LT |
1605 | TCP_SKB_CB(skb)->sacked = 0; |
1606 | ||
9a1f27c4 | 1607 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1608 | if (!sk) |
1609 | goto no_tcp_socket; | |
1610 | ||
1611 | process: | |
1612 | if (sk->sk_state == TCP_TIME_WAIT) | |
1613 | goto do_time_wait; | |
1614 | ||
e802af9c SH |
1615 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1616 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1617 | goto discard_and_relse; | |
1618 | } | |
1619 | ||
1da177e4 LT |
1620 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1621 | goto discard_and_relse; | |
1622 | ||
fda9ef5d | 1623 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1624 | goto discard_and_relse; |
1625 | ||
1626 | skb->dev = NULL; | |
1627 | ||
293b9c42 | 1628 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1629 | ret = 0; |
1630 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1631 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1632 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a | 1633 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
a2bd1140 | 1634 | tp->ucopy.dma_chan = net_dma_find_channel(); |
1ab1457c YH |
1635 | if (tp->ucopy.dma_chan) |
1636 | ret = tcp_v6_do_rcv(sk, skb); | |
1637 | else | |
1a2449a8 CL |
1638 | #endif |
1639 | { | |
1640 | if (!tcp_prequeue(sk, skb)) | |
1641 | ret = tcp_v6_do_rcv(sk, skb); | |
1642 | } | |
da882c1f ED |
1643 | } else if (unlikely(sk_add_backlog(sk, skb, |
1644 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1645 | bh_unlock_sock(sk); |
6cce09f8 | 1646 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1647 | goto discard_and_relse; |
1648 | } | |
1da177e4 LT |
1649 | bh_unlock_sock(sk); |
1650 | ||
1651 | sock_put(sk); | |
1652 | return ret ? -1 : 0; | |
1653 | ||
1654 | no_tcp_socket: | |
1655 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1656 | goto discard_it; | |
1657 | ||
1658 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1659 | bad_packet: | |
63231bdd | 1660 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1661 | } else { |
cfb6eeb4 | 1662 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1663 | } |
1664 | ||
1665 | discard_it: | |
1666 | ||
1667 | /* | |
1668 | * Discard frame | |
1669 | */ | |
1670 | ||
1671 | kfree_skb(skb); | |
1672 | return 0; | |
1673 | ||
1674 | discard_and_relse: | |
1675 | sock_put(sk); | |
1676 | goto discard_it; | |
1677 | ||
1678 | do_time_wait: | |
1679 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1680 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1681 | goto discard_it; |
1682 | } | |
1683 | ||
1684 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
63231bdd | 1685 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
9469c7b4 | 1686 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1687 | goto discard_it; |
1688 | } | |
1689 | ||
9469c7b4 | 1690 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1691 | case TCP_TW_SYN: |
1692 | { | |
1693 | struct sock *sk2; | |
1694 | ||
c346dca1 | 1695 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
0660e03f | 1696 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1697 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1698 | if (sk2 != NULL) { |
295ff7ed ACM |
1699 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1700 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1701 | inet_twsk_put(tw); | |
1da177e4 LT |
1702 | sk = sk2; |
1703 | goto process; | |
1704 | } | |
1705 | /* Fall through to ACK */ | |
1706 | } | |
1707 | case TCP_TW_ACK: | |
1708 | tcp_v6_timewait_ack(sk, skb); | |
1709 | break; | |
1710 | case TCP_TW_RST: | |
1711 | goto no_tcp_socket; | |
1712 | case TCP_TW_SUCCESS:; | |
1713 | } | |
1714 | goto discard_it; | |
1715 | } | |
1716 | ||
c7109986 ED |
1717 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1718 | { | |
1719 | const struct ipv6hdr *hdr; | |
1720 | const struct tcphdr *th; | |
1721 | struct sock *sk; | |
1722 | ||
1723 | if (skb->pkt_type != PACKET_HOST) | |
1724 | return; | |
1725 | ||
1726 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1727 | return; | |
1728 | ||
1729 | hdr = ipv6_hdr(skb); | |
1730 | th = tcp_hdr(skb); | |
1731 | ||
1732 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1733 | return; | |
1734 | ||
1735 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, | |
1736 | &hdr->saddr, th->source, | |
1737 | &hdr->daddr, ntohs(th->dest), | |
1738 | inet6_iif(skb)); | |
1739 | if (sk) { | |
1740 | skb->sk = sk; | |
1741 | skb->destructor = sock_edemux; | |
1742 | if (sk->sk_state != TCP_TIME_WAIT) { | |
1743 | struct dst_entry *dst = sk->sk_rx_dst; | |
f3f12135 | 1744 | |
c7109986 | 1745 | if (dst) |
5d299f3d | 1746 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1747 | if (dst && |
f3f12135 | 1748 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1749 | skb_dst_set_noref(skb, dst); |
1750 | } | |
1751 | } | |
1752 | } | |
1753 | ||
ccb7c410 DM |
1754 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1755 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1756 | .twsk_unique = tcp_twsk_unique, | |
1757 | .twsk_destructor= tcp_twsk_destructor, | |
ccb7c410 DM |
1758 | }; |
1759 | ||
3b401a81 | 1760 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1761 | .queue_xmit = inet6_csk_xmit, |
1762 | .send_check = tcp_v6_send_check, | |
1763 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1764 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1765 | .conn_request = tcp_v6_conn_request, |
1766 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1767 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1768 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1769 | .setsockopt = ipv6_setsockopt, |
1770 | .getsockopt = ipv6_getsockopt, | |
1771 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1772 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1773 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1774 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1775 | .compat_setsockopt = compat_ipv6_setsockopt, |
1776 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1777 | #endif |
1da177e4 LT |
1778 | }; |
1779 | ||
cfb6eeb4 | 1780 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1781 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1782 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1783 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1784 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1785 | }; |
a928630a | 1786 | #endif |
cfb6eeb4 | 1787 | |
1da177e4 LT |
1788 | /* |
1789 | * TCP over IPv4 via INET6 API | |
1790 | */ | |
1791 | ||
3b401a81 | 1792 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1793 | .queue_xmit = ip_queue_xmit, |
1794 | .send_check = tcp_v4_send_check, | |
1795 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1796 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1797 | .conn_request = tcp_v6_conn_request, |
1798 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1799 | .net_header_len = sizeof(struct iphdr), |
1800 | .setsockopt = ipv6_setsockopt, | |
1801 | .getsockopt = ipv6_getsockopt, | |
1802 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1803 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1804 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1805 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1806 | .compat_setsockopt = compat_ipv6_setsockopt, |
1807 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1808 | #endif |
1da177e4 LT |
1809 | }; |
1810 | ||
cfb6eeb4 | 1811 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1812 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1813 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1814 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1815 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1816 | }; |
a928630a | 1817 | #endif |
cfb6eeb4 | 1818 | |
1da177e4 LT |
1819 | /* NOTE: A lot of things set to zero explicitly by call to |
1820 | * sk_alloc() so need not be done here. | |
1821 | */ | |
1822 | static int tcp_v6_init_sock(struct sock *sk) | |
1823 | { | |
6687e988 | 1824 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1825 | |
900f65d3 | 1826 | tcp_init_sock(sk); |
1da177e4 | 1827 | |
8292a17a | 1828 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1829 | |
cfb6eeb4 | 1830 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1831 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1832 | #endif |
1833 | ||
1da177e4 LT |
1834 | return 0; |
1835 | } | |
1836 | ||
7d06b2e0 | 1837 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1838 | { |
1da177e4 | 1839 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1840 | inet6_destroy_sock(sk); |
1da177e4 LT |
1841 | } |
1842 | ||
952a10be | 1843 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1844 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1845 | static void get_openreq6(struct seq_file *seq, |
a7cb5a49 | 1846 | const struct sock *sk, struct request_sock *req, int i, kuid_t uid) |
1da177e4 | 1847 | { |
1da177e4 | 1848 | int ttd = req->expires - jiffies; |
b71d1d42 ED |
1849 | const struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1850 | const struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1851 | |
1852 | if (ttd < 0) | |
1853 | ttd = 0; | |
1854 | ||
1da177e4 LT |
1855 | seq_printf(seq, |
1856 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1857 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1858 | i, |
1859 | src->s6_addr32[0], src->s6_addr32[1], | |
1860 | src->s6_addr32[2], src->s6_addr32[3], | |
fd507037 | 1861 | ntohs(inet_rsk(req)->loc_port), |
1da177e4 LT |
1862 | dest->s6_addr32[0], dest->s6_addr32[1], |
1863 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1864 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1865 | TCP_SYN_RECV, |
1866 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
1867 | 1, /* timers active (only the expire timer) */ |
1868 | jiffies_to_clock_t(ttd), | |
1da177e4 | 1869 | req->retrans, |
a7cb5a49 | 1870 | from_kuid_munged(seq_user_ns(seq), uid), |
1ab1457c | 1871 | 0, /* non standard timer */ |
1da177e4 LT |
1872 | 0, /* open_requests have no inode */ |
1873 | 0, req); | |
1874 | } | |
1875 | ||
1876 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1877 | { | |
b71d1d42 | 1878 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1879 | __u16 destp, srcp; |
1880 | int timer_active; | |
1881 | unsigned long timer_expires; | |
cf533ea5 ED |
1882 | const struct inet_sock *inet = inet_sk(sp); |
1883 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1884 | const struct inet_connection_sock *icsk = inet_csk(sp); |
cf533ea5 | 1885 | const struct ipv6_pinfo *np = inet6_sk(sp); |
1da177e4 LT |
1886 | |
1887 | dest = &np->daddr; | |
1888 | src = &np->rcv_saddr; | |
c720c7e8 ED |
1889 | destp = ntohs(inet->inet_dport); |
1890 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
1891 | |
1892 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1893 | timer_active = 1; |
463c84b9 ACM |
1894 | timer_expires = icsk->icsk_timeout; |
1895 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1896 | timer_active = 4; |
463c84b9 | 1897 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1898 | } else if (timer_pending(&sp->sk_timer)) { |
1899 | timer_active = 2; | |
1900 | timer_expires = sp->sk_timer.expires; | |
1901 | } else { | |
1902 | timer_active = 0; | |
1903 | timer_expires = jiffies; | |
1904 | } | |
1905 | ||
1906 | seq_printf(seq, | |
1907 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1908 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1909 | i, |
1910 | src->s6_addr32[0], src->s6_addr32[1], | |
1911 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1912 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1913 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1914 | sp->sk_state, |
47da8ee6 SS |
1915 | tp->write_seq-tp->snd_una, |
1916 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 | 1917 | timer_active, |
a399a805 | 1918 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1919 | icsk->icsk_retransmits, |
a7cb5a49 | 1920 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1921 | icsk->icsk_probes_out, |
1da177e4 LT |
1922 | sock_i_ino(sp), |
1923 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1924 | jiffies_to_clock_t(icsk->icsk_rto), |
1925 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 1926 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
0b6a05c1 IJ |
1927 | tp->snd_cwnd, |
1928 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh | |
1da177e4 LT |
1929 | ); |
1930 | } | |
1931 | ||
1ab1457c | 1932 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1933 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1934 | { |
b71d1d42 | 1935 | const struct in6_addr *dest, *src; |
1da177e4 | 1936 | __u16 destp, srcp; |
cf533ea5 | 1937 | const struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
a399a805 | 1938 | long delta = tw->tw_ttd - jiffies; |
1da177e4 | 1939 | |
0fa1a53e ACM |
1940 | dest = &tw6->tw_v6_daddr; |
1941 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
1942 | destp = ntohs(tw->tw_dport); |
1943 | srcp = ntohs(tw->tw_sport); | |
1944 | ||
1945 | seq_printf(seq, | |
1946 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1947 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1948 | i, |
1949 | src->s6_addr32[0], src->s6_addr32[1], | |
1950 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1951 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1952 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1953 | tw->tw_substate, 0, 0, | |
a399a805 | 1954 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
1da177e4 LT |
1955 | atomic_read(&tw->tw_refcnt), tw); |
1956 | } | |
1957 | ||
1da177e4 LT |
1958 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1959 | { | |
1960 | struct tcp_iter_state *st; | |
1961 | ||
1962 | if (v == SEQ_START_TOKEN) { | |
1963 | seq_puts(seq, | |
1964 | " sl " | |
1965 | "local_address " | |
1966 | "remote_address " | |
1967 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1968 | " uid timeout inode\n"); | |
1969 | goto out; | |
1970 | } | |
1971 | st = seq->private; | |
1972 | ||
1973 | switch (st->state) { | |
1974 | case TCP_SEQ_STATE_LISTENING: | |
1975 | case TCP_SEQ_STATE_ESTABLISHED: | |
1976 | get_tcp6_sock(seq, v, st->num); | |
1977 | break; | |
1978 | case TCP_SEQ_STATE_OPENREQ: | |
1979 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
1980 | break; | |
1981 | case TCP_SEQ_STATE_TIME_WAIT: | |
1982 | get_timewait6_sock(seq, v, st->num); | |
1983 | break; | |
1984 | } | |
1985 | out: | |
1986 | return 0; | |
1987 | } | |
1988 | ||
73cb88ec AV |
1989 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1990 | .owner = THIS_MODULE, | |
1991 | .open = tcp_seq_open, | |
1992 | .read = seq_read, | |
1993 | .llseek = seq_lseek, | |
1994 | .release = seq_release_net | |
1995 | }; | |
1996 | ||
1da177e4 | 1997 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1998 | .name = "tcp6", |
1999 | .family = AF_INET6, | |
73cb88ec | 2000 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
2001 | .seq_ops = { |
2002 | .show = tcp6_seq_show, | |
2003 | }, | |
1da177e4 LT |
2004 | }; |
2005 | ||
2c8c1e72 | 2006 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 2007 | { |
6f8b13bc | 2008 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2009 | } |
2010 | ||
6f8b13bc | 2011 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2012 | { |
6f8b13bc | 2013 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2014 | } |
2015 | #endif | |
2016 | ||
2017 | struct proto tcpv6_prot = { | |
2018 | .name = "TCPv6", | |
2019 | .owner = THIS_MODULE, | |
2020 | .close = tcp_close, | |
2021 | .connect = tcp_v6_connect, | |
2022 | .disconnect = tcp_disconnect, | |
463c84b9 | 2023 | .accept = inet_csk_accept, |
1da177e4 LT |
2024 | .ioctl = tcp_ioctl, |
2025 | .init = tcp_v6_init_sock, | |
2026 | .destroy = tcp_v6_destroy_sock, | |
2027 | .shutdown = tcp_shutdown, | |
2028 | .setsockopt = tcp_setsockopt, | |
2029 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 2030 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
2031 | .sendmsg = tcp_sendmsg, |
2032 | .sendpage = tcp_sendpage, | |
1da177e4 | 2033 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 2034 | .release_cb = tcp_release_cb, |
563d34d0 | 2035 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 | 2036 | .hash = tcp_v6_hash, |
ab1e0a13 ACM |
2037 | .unhash = inet_unhash, |
2038 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2039 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2040 | .sockets_allocated = &tcp_sockets_allocated, | |
2041 | .memory_allocated = &tcp_memory_allocated, | |
2042 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2043 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2044 | .sysctl_wmem = sysctl_tcp_wmem, |
2045 | .sysctl_rmem = sysctl_tcp_rmem, | |
2046 | .max_header = MAX_TCP_HEADER, | |
2047 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 2048 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 2049 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2050 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2051 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 2052 | .no_autobind = true, |
543d9cfe ACM |
2053 | #ifdef CONFIG_COMPAT |
2054 | .compat_setsockopt = compat_tcp_setsockopt, | |
2055 | .compat_getsockopt = compat_tcp_getsockopt, | |
2056 | #endif | |
c255a458 | 2057 | #ifdef CONFIG_MEMCG_KMEM |
d1a4c0b3 GC |
2058 | .proto_cgroup = tcp_proto_cgroup, |
2059 | #endif | |
1da177e4 LT |
2060 | }; |
2061 | ||
41135cc8 | 2062 | static const struct inet6_protocol tcpv6_protocol = { |
c7109986 | 2063 | .early_demux = tcp_v6_early_demux, |
1da177e4 LT |
2064 | .handler = tcp_v6_rcv, |
2065 | .err_handler = tcp_v6_err, | |
a430a43d | 2066 | .gso_send_check = tcp_v6_gso_send_check, |
adcfc7d0 | 2067 | .gso_segment = tcp_tso_segment, |
684f2176 HX |
2068 | .gro_receive = tcp6_gro_receive, |
2069 | .gro_complete = tcp6_gro_complete, | |
1da177e4 LT |
2070 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
2071 | }; | |
2072 | ||
1da177e4 LT |
2073 | static struct inet_protosw tcpv6_protosw = { |
2074 | .type = SOCK_STREAM, | |
2075 | .protocol = IPPROTO_TCP, | |
2076 | .prot = &tcpv6_prot, | |
2077 | .ops = &inet6_stream_ops, | |
1da177e4 | 2078 | .no_check = 0, |
d83d8461 ACM |
2079 | .flags = INET_PROTOSW_PERMANENT | |
2080 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2081 | }; |
2082 | ||
2c8c1e72 | 2083 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 2084 | { |
5677242f DL |
2085 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2086 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2087 | } |
2088 | ||
2c8c1e72 | 2089 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 2090 | { |
5677242f | 2091 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
2092 | } |
2093 | ||
2c8c1e72 | 2094 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
2095 | { |
2096 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
2097 | } |
2098 | ||
2099 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
2100 | .init = tcpv6_net_init, |
2101 | .exit = tcpv6_net_exit, | |
2102 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
2103 | }; |
2104 | ||
7f4e4868 | 2105 | int __init tcpv6_init(void) |
1da177e4 | 2106 | { |
7f4e4868 DL |
2107 | int ret; |
2108 | ||
2109 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2110 | if (ret) | |
2111 | goto out; | |
2112 | ||
1da177e4 | 2113 | /* register inet6 protocol */ |
7f4e4868 DL |
2114 | ret = inet6_register_protosw(&tcpv6_protosw); |
2115 | if (ret) | |
2116 | goto out_tcpv6_protocol; | |
2117 | ||
93ec926b | 2118 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2119 | if (ret) |
2120 | goto out_tcpv6_protosw; | |
2121 | out: | |
2122 | return ret; | |
ae0f7d5f | 2123 | |
7f4e4868 DL |
2124 | out_tcpv6_protocol: |
2125 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2126 | out_tcpv6_protosw: | |
2127 | inet6_unregister_protosw(&tcpv6_protosw); | |
2128 | goto out; | |
2129 | } | |
2130 | ||
09f7709f | 2131 | void tcpv6_exit(void) |
7f4e4868 | 2132 | { |
93ec926b | 2133 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2134 | inet6_unregister_protosw(&tcpv6_protosw); |
2135 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2136 | } |