Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * TCP over IPv6 | |
1ab1457c | 4 | * Linux INET6 implementation |
1da177e4 LT |
5 | * |
6 | * Authors: | |
1ab1457c | 7 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 8 | * |
1ab1457c | 9 | * Based on: |
1da177e4 LT |
10 | * linux/net/ipv4/tcp.c |
11 | * linux/net/ipv4/tcp_input.c | |
12 | * linux/net/ipv4/tcp_output.c | |
13 | * | |
14 | * Fixes: | |
15 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
16 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
17 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
18 | * a single port at the same time. | |
19 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file. | |
1da177e4 LT |
20 | */ |
21 | ||
eb4dea58 | 22 | #include <linux/bottom_half.h> |
1da177e4 | 23 | #include <linux/module.h> |
1da177e4 LT |
24 | #include <linux/errno.h> |
25 | #include <linux/types.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/sockios.h> | |
28 | #include <linux/net.h> | |
29 | #include <linux/jiffies.h> | |
30 | #include <linux/in.h> | |
31 | #include <linux/in6.h> | |
32 | #include <linux/netdevice.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/jhash.h> | |
35 | #include <linux/ipsec.h> | |
36 | #include <linux/times.h> | |
5a0e3ad6 | 37 | #include <linux/slab.h> |
4aa956d8 | 38 | #include <linux/uaccess.h> |
1da177e4 LT |
39 | #include <linux/ipv6.h> |
40 | #include <linux/icmpv6.h> | |
41 | #include <linux/random.h> | |
0e219ae4 | 42 | #include <linux/indirect_call_wrapper.h> |
1da177e4 LT |
43 | |
44 | #include <net/tcp.h> | |
45 | #include <net/ndisc.h> | |
5324a040 | 46 | #include <net/inet6_hashtables.h> |
8129765a | 47 | #include <net/inet6_connection_sock.h> |
1da177e4 LT |
48 | #include <net/ipv6.h> |
49 | #include <net/transp_v6.h> | |
50 | #include <net/addrconf.h> | |
51 | #include <net/ip6_route.h> | |
52 | #include <net/ip6_checksum.h> | |
53 | #include <net/inet_ecn.h> | |
54 | #include <net/protocol.h> | |
55 | #include <net/xfrm.h> | |
1da177e4 LT |
56 | #include <net/snmp.h> |
57 | #include <net/dsfield.h> | |
6d6ee43e | 58 | #include <net/timewait_sock.h> |
3d58b5fa | 59 | #include <net/inet_common.h> |
6e5714ea | 60 | #include <net/secure_seq.h> |
076bb0c8 | 61 | #include <net/busy_poll.h> |
1da177e4 | 62 | |
1da177e4 LT |
63 | #include <linux/proc_fs.h> |
64 | #include <linux/seq_file.h> | |
65 | ||
cf80e0e4 | 66 | #include <crypto/hash.h> |
cfb6eeb4 YH |
67 | #include <linux/scatterlist.h> |
68 | ||
c24b14c4 SL |
69 | #include <trace/events/tcp.h> |
70 | ||
a00e7444 ED |
71 | static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb); |
72 | static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, | |
6edafaaf | 73 | struct request_sock *req); |
1da177e4 LT |
74 | |
75 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 76 | |
3b401a81 SH |
77 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
78 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 79 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
80 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
81 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 | 82 | #else |
51723935 | 83 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk, |
b71d1d42 | 84 | const struct in6_addr *addr) |
9501f972 YH |
85 | { |
86 | return NULL; | |
87 | } | |
a928630a | 88 | #endif |
1da177e4 | 89 | |
93a77c11 ED |
90 | /* Helper returning the inet6 address from a given tcp socket. |
91 | * It can be used in TCP stack instead of inet6_sk(sk). | |
92 | * This avoids a dereference and allow compiler optimizations. | |
f5d54767 | 93 | * It is a specialized version of inet6_sk_generic(). |
93a77c11 ED |
94 | */ |
95 | static struct ipv6_pinfo *tcp_inet6_sk(const struct sock *sk) | |
96 | { | |
f5d54767 | 97 | unsigned int offset = sizeof(struct tcp6_sock) - sizeof(struct ipv6_pinfo); |
93a77c11 | 98 | |
f5d54767 | 99 | return (struct ipv6_pinfo *)(((u8 *)sk) + offset); |
93a77c11 ED |
100 | } |
101 | ||
fae6ef87 NC |
102 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
103 | { | |
104 | struct dst_entry *dst = skb_dst(skb); | |
fae6ef87 | 105 | |
5037e9ef | 106 | if (dst && dst_hold_safe(dst)) { |
ca777eff ED |
107 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
108 | ||
ca777eff ED |
109 | sk->sk_rx_dst = dst; |
110 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
93a77c11 | 111 | tcp_inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt); |
ca777eff | 112 | } |
fae6ef87 NC |
113 | } |
114 | ||
84b114b9 | 115 | static u32 tcp_v6_init_seq(const struct sk_buff *skb) |
1da177e4 | 116 | { |
84b114b9 ED |
117 | return secure_tcpv6_seq(ipv6_hdr(skb)->daddr.s6_addr32, |
118 | ipv6_hdr(skb)->saddr.s6_addr32, | |
119 | tcp_hdr(skb)->dest, | |
120 | tcp_hdr(skb)->source); | |
121 | } | |
122 | ||
5d2ed052 | 123 | static u32 tcp_v6_init_ts_off(const struct net *net, const struct sk_buff *skb) |
84b114b9 | 124 | { |
5d2ed052 | 125 | return secure_tcpv6_ts_off(net, ipv6_hdr(skb)->daddr.s6_addr32, |
84b114b9 | 126 | ipv6_hdr(skb)->saddr.s6_addr32); |
1da177e4 LT |
127 | } |
128 | ||
d74bad4e AI |
129 | static int tcp_v6_pre_connect(struct sock *sk, struct sockaddr *uaddr, |
130 | int addr_len) | |
131 | { | |
132 | /* This check is replicated from tcp_v6_connect() and intended to | |
133 | * prevent BPF program called below from accessing bytes that are out | |
134 | * of the bound specified by user in addr_len. | |
135 | */ | |
136 | if (addr_len < SIN6_LEN_RFC2133) | |
137 | return -EINVAL; | |
138 | ||
139 | sock_owned_by_me(sk); | |
140 | ||
141 | return BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr); | |
142 | } | |
143 | ||
1ab1457c | 144 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
145 | int addr_len) |
146 | { | |
147 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 148 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 149 | struct inet_connection_sock *icsk = inet_csk(sk); |
93a77c11 | 150 | struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
1da177e4 | 151 | struct tcp_sock *tp = tcp_sk(sk); |
20c59de2 | 152 | struct in6_addr *saddr = NULL, *final_p, final; |
45f6fad8 | 153 | struct ipv6_txoptions *opt; |
4c9483b2 | 154 | struct flowi6 fl6; |
1da177e4 LT |
155 | struct dst_entry *dst; |
156 | int addr_type; | |
157 | int err; | |
1946e672 | 158 | struct inet_timewait_death_row *tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row; |
1da177e4 | 159 | |
1ab1457c | 160 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
161 | return -EINVAL; |
162 | ||
1ab1457c | 163 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 164 | return -EAFNOSUPPORT; |
1da177e4 | 165 | |
4c9483b2 | 166 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
167 | |
168 | if (np->sndflow) { | |
4c9483b2 DM |
169 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
170 | IP6_ECN_flow_init(fl6.flowlabel); | |
171 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 172 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 173 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
59c820b2 | 174 | if (IS_ERR(flowlabel)) |
1da177e4 | 175 | return -EINVAL; |
1da177e4 LT |
176 | fl6_sock_release(flowlabel); |
177 | } | |
178 | } | |
179 | ||
180 | /* | |
1ab1457c YH |
181 | * connect() to INADDR_ANY means loopback (BSD'ism). |
182 | */ | |
183 | ||
052d2369 JL |
184 | if (ipv6_addr_any(&usin->sin6_addr)) { |
185 | if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) | |
186 | ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), | |
187 | &usin->sin6_addr); | |
188 | else | |
189 | usin->sin6_addr = in6addr_loopback; | |
190 | } | |
1da177e4 LT |
191 | |
192 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
193 | ||
4c99aa40 | 194 | if (addr_type & IPV6_ADDR_MULTICAST) |
1da177e4 LT |
195 | return -ENETUNREACH; |
196 | ||
197 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
198 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
199 | usin->sin6_scope_id) { | |
200 | /* If interface is set while binding, indices | |
201 | * must coincide. | |
202 | */ | |
54dc3e33 | 203 | if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id)) |
1da177e4 LT |
204 | return -EINVAL; |
205 | ||
206 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
207 | } | |
208 | ||
209 | /* Connect to link-local address requires an interface */ | |
210 | if (!sk->sk_bound_dev_if) | |
211 | return -EINVAL; | |
212 | } | |
213 | ||
214 | if (tp->rx_opt.ts_recent_stamp && | |
efe4208f | 215 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
1da177e4 LT |
216 | tp->rx_opt.ts_recent = 0; |
217 | tp->rx_opt.ts_recent_stamp = 0; | |
218 | tp->write_seq = 0; | |
219 | } | |
220 | ||
efe4208f | 221 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 222 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
223 | |
224 | /* | |
225 | * TCP over IPv4 | |
226 | */ | |
227 | ||
052d2369 | 228 | if (addr_type & IPV6_ADDR_MAPPED) { |
d83d8461 | 229 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
230 | struct sockaddr_in sin; |
231 | ||
1da177e4 LT |
232 | if (__ipv6_only_sock(sk)) |
233 | return -ENETUNREACH; | |
234 | ||
235 | sin.sin_family = AF_INET; | |
236 | sin.sin_port = usin->sin6_port; | |
237 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
238 | ||
d83d8461 | 239 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 240 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
241 | #ifdef CONFIG_TCP_MD5SIG |
242 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
243 | #endif | |
1da177e4 LT |
244 | |
245 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
246 | ||
247 | if (err) { | |
d83d8461 ACM |
248 | icsk->icsk_ext_hdr_len = exthdrlen; |
249 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 250 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
251 | #ifdef CONFIG_TCP_MD5SIG |
252 | tp->af_specific = &tcp_sock_ipv6_specific; | |
253 | #endif | |
1da177e4 | 254 | goto failure; |
1da177e4 | 255 | } |
d1e559d0 | 256 | np->saddr = sk->sk_v6_rcv_saddr; |
1da177e4 LT |
257 | |
258 | return err; | |
259 | } | |
260 | ||
efe4208f ED |
261 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
262 | saddr = &sk->sk_v6_rcv_saddr; | |
1da177e4 | 263 | |
4c9483b2 | 264 | fl6.flowi6_proto = IPPROTO_TCP; |
efe4208f | 265 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 266 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 DM |
267 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
268 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
269 | fl6.fl6_dport = usin->sin6_port; |
270 | fl6.fl6_sport = inet->inet_sport; | |
e2d118a1 | 271 | fl6.flowi6_uid = sk->sk_uid; |
1da177e4 | 272 | |
1e1d04e6 | 273 | opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); |
45f6fad8 | 274 | final_p = fl6_update_dst(&fl6, opt, &final); |
1da177e4 | 275 | |
4c9483b2 | 276 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 277 | |
0e0d44ab | 278 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
279 | if (IS_ERR(dst)) { |
280 | err = PTR_ERR(dst); | |
1da177e4 | 281 | goto failure; |
14e50e57 | 282 | } |
1da177e4 | 283 | |
63159f29 | 284 | if (!saddr) { |
4c9483b2 | 285 | saddr = &fl6.saddr; |
efe4208f | 286 | sk->sk_v6_rcv_saddr = *saddr; |
1da177e4 LT |
287 | } |
288 | ||
289 | /* set the source address */ | |
4e3fd7a0 | 290 | np->saddr = *saddr; |
c720c7e8 | 291 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 292 | |
f83ef8c0 | 293 | sk->sk_gso_type = SKB_GSO_TCPV6; |
6bd4f355 | 294 | ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 295 | |
d83d8461 | 296 | icsk->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
297 | if (opt) |
298 | icsk->icsk_ext_hdr_len = opt->opt_flen + | |
299 | opt->opt_nflen; | |
1da177e4 LT |
300 | |
301 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
302 | ||
c720c7e8 | 303 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
304 | |
305 | tcp_set_state(sk, TCP_SYN_SENT); | |
1946e672 | 306 | err = inet6_hash_connect(tcp_death_row, sk); |
1da177e4 LT |
307 | if (err) |
308 | goto late_failure; | |
309 | ||
877d1f62 | 310 | sk_set_txhash(sk); |
9e7ceb06 | 311 | |
00355fa5 | 312 | if (likely(!tp->repair)) { |
00355fa5 | 313 | if (!tp->write_seq) |
84b114b9 ED |
314 | tp->write_seq = secure_tcpv6_seq(np->saddr.s6_addr32, |
315 | sk->sk_v6_daddr.s6_addr32, | |
316 | inet->inet_sport, | |
317 | inet->inet_dport); | |
5d2ed052 ED |
318 | tp->tsoffset = secure_tcpv6_ts_off(sock_net(sk), |
319 | np->saddr.s6_addr32, | |
84b114b9 | 320 | sk->sk_v6_daddr.s6_addr32); |
00355fa5 | 321 | } |
1da177e4 | 322 | |
19f6d3f3 WW |
323 | if (tcp_fastopen_defer_connect(sk, &err)) |
324 | return err; | |
325 | if (err) | |
326 | goto late_failure; | |
327 | ||
1da177e4 LT |
328 | err = tcp_connect(sk); |
329 | if (err) | |
330 | goto late_failure; | |
331 | ||
332 | return 0; | |
333 | ||
334 | late_failure: | |
335 | tcp_set_state(sk, TCP_CLOSE); | |
1da177e4 | 336 | failure: |
c720c7e8 | 337 | inet->inet_dport = 0; |
1da177e4 LT |
338 | sk->sk_route_caps = 0; |
339 | return err; | |
340 | } | |
341 | ||
563d34d0 ED |
342 | static void tcp_v6_mtu_reduced(struct sock *sk) |
343 | { | |
344 | struct dst_entry *dst; | |
345 | ||
346 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
347 | return; | |
348 | ||
349 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
350 | if (!dst) | |
351 | return; | |
352 | ||
353 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
354 | tcp_sync_mss(sk, dst_mtu(dst)); | |
355 | tcp_simple_retransmit(sk); | |
356 | } | |
357 | } | |
358 | ||
32bbd879 | 359 | static int tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 360 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 361 | { |
4c99aa40 | 362 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
505cbfc5 | 363 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
2215089b ED |
364 | struct net *net = dev_net(skb->dev); |
365 | struct request_sock *fastopen; | |
1da177e4 | 366 | struct ipv6_pinfo *np; |
1ab1457c | 367 | struct tcp_sock *tp; |
0a672f74 | 368 | __u32 seq, snd_una; |
2215089b | 369 | struct sock *sk; |
9cf74903 | 370 | bool fatal; |
2215089b | 371 | int err; |
1da177e4 | 372 | |
2215089b ED |
373 | sk = __inet6_lookup_established(net, &tcp_hashinfo, |
374 | &hdr->daddr, th->dest, | |
375 | &hdr->saddr, ntohs(th->source), | |
4297a0ef | 376 | skb->dev->ifindex, inet6_sdif(skb)); |
1da177e4 | 377 | |
2215089b | 378 | if (!sk) { |
a16292a0 ED |
379 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
380 | ICMP6_MIB_INERRORS); | |
32bbd879 | 381 | return -ENOENT; |
1da177e4 LT |
382 | } |
383 | ||
384 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 385 | inet_twsk_put(inet_twsk(sk)); |
32bbd879 | 386 | return 0; |
1da177e4 | 387 | } |
2215089b | 388 | seq = ntohl(th->seq); |
9cf74903 | 389 | fatal = icmpv6_err_convert(type, code, &err); |
32bbd879 SB |
390 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
391 | tcp_req_err(sk, seq, fatal); | |
392 | return 0; | |
393 | } | |
1da177e4 LT |
394 | |
395 | bh_lock_sock(sk); | |
563d34d0 | 396 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
02a1d6e7 | 397 | __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
398 | |
399 | if (sk->sk_state == TCP_CLOSE) | |
400 | goto out; | |
401 | ||
93a77c11 | 402 | if (ipv6_hdr(skb)->hop_limit < tcp_inet6_sk(sk)->min_hopcount) { |
02a1d6e7 | 403 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
e802af9c SH |
404 | goto out; |
405 | } | |
406 | ||
1da177e4 | 407 | tp = tcp_sk(sk); |
0a672f74 YC |
408 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
409 | fastopen = tp->fastopen_rsk; | |
410 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; | |
1da177e4 | 411 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 412 | !between(seq, snd_una, tp->snd_nxt)) { |
02a1d6e7 | 413 | __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
414 | goto out; |
415 | } | |
416 | ||
93a77c11 | 417 | np = tcp_inet6_sk(sk); |
1da177e4 | 418 | |
ec18d9a2 | 419 | if (type == NDISC_REDIRECT) { |
45caeaa5 JM |
420 | if (!sock_owned_by_user(sk)) { |
421 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
ec18d9a2 | 422 | |
45caeaa5 JM |
423 | if (dst) |
424 | dst->ops->redirect(dst, sk, skb); | |
425 | } | |
50a75a89 | 426 | goto out; |
ec18d9a2 DM |
427 | } |
428 | ||
1da177e4 | 429 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
430 | /* We are not interested in TCP_LISTEN and open_requests |
431 | * (SYN-ACKs send out by Linux are always <576bytes so | |
432 | * they should go through unfragmented). | |
433 | */ | |
434 | if (sk->sk_state == TCP_LISTEN) | |
435 | goto out; | |
436 | ||
93b36cf3 HFS |
437 | if (!ip6_sk_accept_pmtu(sk)) |
438 | goto out; | |
439 | ||
563d34d0 ED |
440 | tp->mtu_info = ntohl(info); |
441 | if (!sock_owned_by_user(sk)) | |
442 | tcp_v6_mtu_reduced(sk); | |
d013ef2a | 443 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
7aa5470c | 444 | &sk->sk_tsq_flags)) |
d013ef2a | 445 | sock_hold(sk); |
1da177e4 LT |
446 | goto out; |
447 | } | |
448 | ||
1da177e4 | 449 | |
60236fdd | 450 | /* Might be for an request_sock */ |
1da177e4 | 451 | switch (sk->sk_state) { |
1da177e4 | 452 | case TCP_SYN_SENT: |
0a672f74 YC |
453 | case TCP_SYN_RECV: |
454 | /* Only in fast or simultaneous open. If a fast open socket is | |
455 | * is already accepted it is treated as a connected one below. | |
456 | */ | |
63159f29 | 457 | if (fastopen && !fastopen->sk) |
0a672f74 YC |
458 | break; |
459 | ||
1da177e4 | 460 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
461 | sk->sk_err = err; |
462 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
463 | ||
464 | tcp_done(sk); | |
465 | } else | |
466 | sk->sk_err_soft = err; | |
467 | goto out; | |
468 | } | |
469 | ||
470 | if (!sock_owned_by_user(sk) && np->recverr) { | |
471 | sk->sk_err = err; | |
472 | sk->sk_error_report(sk); | |
473 | } else | |
474 | sk->sk_err_soft = err; | |
475 | ||
476 | out: | |
477 | bh_unlock_sock(sk); | |
478 | sock_put(sk); | |
32bbd879 | 479 | return 0; |
1da177e4 LT |
480 | } |
481 | ||
482 | ||
0f935dbe | 483 | static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst, |
d6274bd8 | 484 | struct flowi *fl, |
3840a06e | 485 | struct request_sock *req, |
ca6fb065 | 486 | struct tcp_fastopen_cookie *foc, |
b3d05147 | 487 | enum tcp_synack_type synack_type) |
1da177e4 | 488 | { |
634fb979 | 489 | struct inet_request_sock *ireq = inet_rsk(req); |
93a77c11 | 490 | struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
56ac42bc | 491 | struct ipv6_txoptions *opt; |
d6274bd8 | 492 | struct flowi6 *fl6 = &fl->u.ip6; |
4c99aa40 | 493 | struct sk_buff *skb; |
9494218f | 494 | int err = -ENOMEM; |
1da177e4 | 495 | |
9f10d3f6 | 496 | /* First, grab a route. */ |
f76b33c3 ED |
497 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req, |
498 | IPPROTO_TCP)) == NULL) | |
fd80eb94 | 499 | goto done; |
9494218f | 500 | |
b3d05147 | 501 | skb = tcp_make_synack(sk, dst, req, foc, synack_type); |
9494218f | 502 | |
1da177e4 | 503 | if (skb) { |
634fb979 ED |
504 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
505 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 506 | |
634fb979 | 507 | fl6->daddr = ireq->ir_v6_rmt_addr; |
53b24b8f | 508 | if (np->repflow && ireq->pktopts) |
df3687ff FF |
509 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); |
510 | ||
3e4006f0 | 511 | rcu_read_lock(); |
56ac42bc HD |
512 | opt = ireq->ipv6_opt; |
513 | if (!opt) | |
514 | opt = rcu_dereference(np->opt); | |
4f6570d7 ED |
515 | err = ip6_xmit(sk, skb, fl6, sk->sk_mark, opt, np->tclass, |
516 | sk->sk_priority); | |
3e4006f0 | 517 | rcu_read_unlock(); |
b9df3cb8 | 518 | err = net_xmit_eval(err); |
1da177e4 LT |
519 | } |
520 | ||
521 | done: | |
1da177e4 LT |
522 | return err; |
523 | } | |
524 | ||
72659ecc | 525 | |
60236fdd | 526 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 527 | { |
56ac42bc | 528 | kfree(inet_rsk(req)->ipv6_opt); |
634fb979 | 529 | kfree_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
530 | } |
531 | ||
cfb6eeb4 | 532 | #ifdef CONFIG_TCP_MD5SIG |
b83e3deb | 533 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk, |
b71d1d42 | 534 | const struct in6_addr *addr) |
cfb6eeb4 | 535 | { |
a915da9b | 536 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
537 | } |
538 | ||
b83e3deb | 539 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk, |
fd3a154a | 540 | const struct sock *addr_sk) |
cfb6eeb4 | 541 | { |
efe4208f | 542 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
cfb6eeb4 YH |
543 | } |
544 | ||
8917a777 ID |
545 | static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, |
546 | char __user *optval, int optlen) | |
cfb6eeb4 YH |
547 | { |
548 | struct tcp_md5sig cmd; | |
549 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
8917a777 | 550 | u8 prefixlen; |
cfb6eeb4 YH |
551 | |
552 | if (optlen < sizeof(cmd)) | |
553 | return -EINVAL; | |
554 | ||
555 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
556 | return -EFAULT; | |
557 | ||
558 | if (sin6->sin6_family != AF_INET6) | |
559 | return -EINVAL; | |
560 | ||
8917a777 ID |
561 | if (optname == TCP_MD5SIG_EXT && |
562 | cmd.tcpm_flags & TCP_MD5SIG_FLAG_PREFIX) { | |
563 | prefixlen = cmd.tcpm_prefixlen; | |
564 | if (prefixlen > 128 || (ipv6_addr_v4mapped(&sin6->sin6_addr) && | |
565 | prefixlen > 32)) | |
566 | return -EINVAL; | |
567 | } else { | |
568 | prefixlen = ipv6_addr_v4mapped(&sin6->sin6_addr) ? 32 : 128; | |
569 | } | |
570 | ||
cfb6eeb4 | 571 | if (!cmd.tcpm_keylen) { |
e773e4fa | 572 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b | 573 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
8917a777 | 574 | AF_INET, prefixlen); |
a915da9b | 575 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
8917a777 | 576 | AF_INET6, prefixlen); |
cfb6eeb4 YH |
577 | } |
578 | ||
579 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
580 | return -EINVAL; | |
581 | ||
a915da9b ED |
582 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
583 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
8917a777 | 584 | AF_INET, prefixlen, cmd.tcpm_key, |
6797318e | 585 | cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 | 586 | |
a915da9b | 587 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
8917a777 ID |
588 | AF_INET6, prefixlen, cmd.tcpm_key, |
589 | cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
590 | } |
591 | ||
19689e38 ED |
592 | static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp, |
593 | const struct in6_addr *daddr, | |
594 | const struct in6_addr *saddr, | |
595 | const struct tcphdr *th, int nbytes) | |
cfb6eeb4 | 596 | { |
cfb6eeb4 | 597 | struct tcp6_pseudohdr *bp; |
49a72dfb | 598 | struct scatterlist sg; |
19689e38 | 599 | struct tcphdr *_th; |
8d26d76d | 600 | |
19689e38 | 601 | bp = hp->scratch; |
cfb6eeb4 | 602 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
603 | bp->saddr = *saddr; |
604 | bp->daddr = *daddr; | |
49a72dfb | 605 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 606 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 607 | |
19689e38 ED |
608 | _th = (struct tcphdr *)(bp + 1); |
609 | memcpy(_th, th, sizeof(*th)); | |
610 | _th->check = 0; | |
611 | ||
612 | sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th)); | |
613 | ahash_request_set_crypt(hp->md5_req, &sg, NULL, | |
614 | sizeof(*bp) + sizeof(*th)); | |
cf80e0e4 | 615 | return crypto_ahash_update(hp->md5_req); |
49a72dfb | 616 | } |
c7da57a1 | 617 | |
19689e38 | 618 | static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, |
b71d1d42 | 619 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 620 | const struct tcphdr *th) |
49a72dfb AL |
621 | { |
622 | struct tcp_md5sig_pool *hp; | |
cf80e0e4 | 623 | struct ahash_request *req; |
49a72dfb AL |
624 | |
625 | hp = tcp_get_md5sig_pool(); | |
626 | if (!hp) | |
627 | goto clear_hash_noput; | |
cf80e0e4 | 628 | req = hp->md5_req; |
49a72dfb | 629 | |
cf80e0e4 | 630 | if (crypto_ahash_init(req)) |
49a72dfb | 631 | goto clear_hash; |
19689e38 | 632 | if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2)) |
49a72dfb AL |
633 | goto clear_hash; |
634 | if (tcp_md5_hash_key(hp, key)) | |
635 | goto clear_hash; | |
cf80e0e4 HX |
636 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
637 | if (crypto_ahash_final(req)) | |
cfb6eeb4 | 638 | goto clear_hash; |
cfb6eeb4 | 639 | |
cfb6eeb4 | 640 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 641 | return 0; |
49a72dfb | 642 | |
cfb6eeb4 YH |
643 | clear_hash: |
644 | tcp_put_md5sig_pool(); | |
645 | clear_hash_noput: | |
646 | memset(md5_hash, 0, 16); | |
49a72dfb | 647 | return 1; |
cfb6eeb4 YH |
648 | } |
649 | ||
39f8e58e ED |
650 | static int tcp_v6_md5_hash_skb(char *md5_hash, |
651 | const struct tcp_md5sig_key *key, | |
318cf7aa | 652 | const struct sock *sk, |
318cf7aa | 653 | const struct sk_buff *skb) |
cfb6eeb4 | 654 | { |
b71d1d42 | 655 | const struct in6_addr *saddr, *daddr; |
49a72dfb | 656 | struct tcp_md5sig_pool *hp; |
cf80e0e4 | 657 | struct ahash_request *req; |
318cf7aa | 658 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 659 | |
39f8e58e ED |
660 | if (sk) { /* valid for establish/request sockets */ |
661 | saddr = &sk->sk_v6_rcv_saddr; | |
efe4208f | 662 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 663 | } else { |
b71d1d42 | 664 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
665 | saddr = &ip6h->saddr; |
666 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 667 | } |
49a72dfb AL |
668 | |
669 | hp = tcp_get_md5sig_pool(); | |
670 | if (!hp) | |
671 | goto clear_hash_noput; | |
cf80e0e4 | 672 | req = hp->md5_req; |
49a72dfb | 673 | |
cf80e0e4 | 674 | if (crypto_ahash_init(req)) |
49a72dfb AL |
675 | goto clear_hash; |
676 | ||
19689e38 | 677 | if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len)) |
49a72dfb AL |
678 | goto clear_hash; |
679 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
680 | goto clear_hash; | |
681 | if (tcp_md5_hash_key(hp, key)) | |
682 | goto clear_hash; | |
cf80e0e4 HX |
683 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
684 | if (crypto_ahash_final(req)) | |
49a72dfb AL |
685 | goto clear_hash; |
686 | ||
687 | tcp_put_md5sig_pool(); | |
688 | return 0; | |
689 | ||
690 | clear_hash: | |
691 | tcp_put_md5sig_pool(); | |
692 | clear_hash_noput: | |
693 | memset(md5_hash, 0, 16); | |
694 | return 1; | |
cfb6eeb4 YH |
695 | } |
696 | ||
ba8e275a ED |
697 | #endif |
698 | ||
699 | static bool tcp_v6_inbound_md5_hash(const struct sock *sk, | |
700 | const struct sk_buff *skb) | |
cfb6eeb4 | 701 | { |
ba8e275a | 702 | #ifdef CONFIG_TCP_MD5SIG |
cf533ea5 | 703 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 704 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 705 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 706 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 707 | int genhash; |
cfb6eeb4 YH |
708 | u8 newhash[16]; |
709 | ||
710 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 711 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 712 | |
785957d3 DM |
713 | /* We've parsed the options - do we have a hash? */ |
714 | if (!hash_expected && !hash_location) | |
ff74e23f | 715 | return false; |
785957d3 DM |
716 | |
717 | if (hash_expected && !hash_location) { | |
c10d9310 | 718 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
ff74e23f | 719 | return true; |
cfb6eeb4 YH |
720 | } |
721 | ||
785957d3 | 722 | if (!hash_expected && hash_location) { |
c10d9310 | 723 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
ff74e23f | 724 | return true; |
cfb6eeb4 YH |
725 | } |
726 | ||
727 | /* check the signature */ | |
49a72dfb AL |
728 | genhash = tcp_v6_md5_hash_skb(newhash, |
729 | hash_expected, | |
39f8e58e | 730 | NULL, skb); |
49a72dfb | 731 | |
cfb6eeb4 | 732 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
72145a68 | 733 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE); |
e87cc472 JP |
734 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
735 | genhash ? "failed" : "mismatch", | |
736 | &ip6h->saddr, ntohs(th->source), | |
737 | &ip6h->daddr, ntohs(th->dest)); | |
ff74e23f | 738 | return true; |
cfb6eeb4 | 739 | } |
ba8e275a | 740 | #endif |
ff74e23f | 741 | return false; |
cfb6eeb4 | 742 | } |
cfb6eeb4 | 743 | |
b40cf18e ED |
744 | static void tcp_v6_init_req(struct request_sock *req, |
745 | const struct sock *sk_listener, | |
16bea70a OP |
746 | struct sk_buff *skb) |
747 | { | |
c2027d1e | 748 | bool l3_slave = ipv6_l3mdev_skb(TCP_SKB_CB(skb)->header.h6.flags); |
16bea70a | 749 | struct inet_request_sock *ireq = inet_rsk(req); |
93a77c11 | 750 | const struct ipv6_pinfo *np = tcp_inet6_sk(sk_listener); |
16bea70a OP |
751 | |
752 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
753 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
754 | ||
16bea70a | 755 | /* So that link locals have meaning */ |
c2027d1e | 756 | if ((!sk_listener->sk_bound_dev_if || l3_slave) && |
16bea70a | 757 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
870c3151 | 758 | ireq->ir_iif = tcp_v6_iif(skb); |
16bea70a | 759 | |
04317daf | 760 | if (!TCP_SKB_CB(skb)->tcp_tw_isn && |
b40cf18e | 761 | (ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) || |
a224772d | 762 | np->rxopt.bits.rxinfo || |
16bea70a OP |
763 | np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim || |
764 | np->rxopt.bits.rxohlim || np->repflow)) { | |
63354797 | 765 | refcount_inc(&skb->users); |
16bea70a OP |
766 | ireq->pktopts = skb; |
767 | } | |
768 | } | |
769 | ||
f964629e ED |
770 | static struct dst_entry *tcp_v6_route_req(const struct sock *sk, |
771 | struct flowi *fl, | |
4396e461 | 772 | const struct request_sock *req) |
d94e0417 | 773 | { |
f76b33c3 | 774 | return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP); |
d94e0417 OP |
775 | } |
776 | ||
c6aefafb | 777 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 778 | .family = AF_INET6, |
2e6599cb | 779 | .obj_size = sizeof(struct tcp6_request_sock), |
5db92c99 | 780 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
781 | .send_ack = tcp_v6_reqsk_send_ack, |
782 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 783 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 784 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
785 | }; |
786 | ||
b2e4b3de | 787 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
2aec4a29 OP |
788 | .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - |
789 | sizeof(struct ipv6hdr), | |
16bea70a | 790 | #ifdef CONFIG_TCP_MD5SIG |
fd3a154a | 791 | .req_md5_lookup = tcp_v6_md5_lookup, |
e3afe7b7 | 792 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
b6332e6c | 793 | #endif |
16bea70a | 794 | .init_req = tcp_v6_init_req, |
fb7b37a7 OP |
795 | #ifdef CONFIG_SYN_COOKIES |
796 | .cookie_init_seq = cookie_v6_init_sequence, | |
797 | #endif | |
d94e0417 | 798 | .route_req = tcp_v6_route_req, |
84b114b9 ED |
799 | .init_seq = tcp_v6_init_seq, |
800 | .init_ts_off = tcp_v6_init_ts_off, | |
d6274bd8 | 801 | .send_synack = tcp_v6_send_synack, |
16bea70a | 802 | }; |
cfb6eeb4 | 803 | |
a00e7444 | 804 | static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae ED |
805 | u32 ack, u32 win, u32 tsval, u32 tsecr, |
806 | int oif, struct tcp_md5sig_key *key, int rst, | |
e9a5dcee | 807 | u8 tclass, __be32 label, u32 priority) |
1da177e4 | 808 | { |
cf533ea5 ED |
809 | const struct tcphdr *th = tcp_hdr(skb); |
810 | struct tcphdr *t1; | |
1da177e4 | 811 | struct sk_buff *buff; |
4c9483b2 | 812 | struct flowi6 fl6; |
0f85feae | 813 | struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
e5047992 | 814 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 815 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 816 | struct dst_entry *dst; |
81ada62d | 817 | __be32 *topt; |
00483690 | 818 | __u32 mark = 0; |
1da177e4 | 819 | |
ee684b6f | 820 | if (tsecr) |
626e264d | 821 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 822 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
823 | if (key) |
824 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
825 | #endif | |
826 | ||
cfb6eeb4 | 827 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 828 | GFP_ATOMIC); |
63159f29 | 829 | if (!buff) |
1ab1457c | 830 | return; |
1da177e4 | 831 | |
cfb6eeb4 | 832 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 833 | |
d58ff351 | 834 | t1 = skb_push(buff, tot_len); |
6651ffc8 | 835 | skb_reset_transport_header(buff); |
1da177e4 LT |
836 | |
837 | /* Swap the send and the receive. */ | |
838 | memset(t1, 0, sizeof(*t1)); | |
839 | t1->dest = th->source; | |
840 | t1->source = th->dest; | |
cfb6eeb4 | 841 | t1->doff = tot_len / 4; |
626e264d IJ |
842 | t1->seq = htonl(seq); |
843 | t1->ack_seq = htonl(ack); | |
844 | t1->ack = !rst || !th->ack; | |
845 | t1->rst = rst; | |
846 | t1->window = htons(win); | |
1da177e4 | 847 | |
81ada62d IJ |
848 | topt = (__be32 *)(t1 + 1); |
849 | ||
ee684b6f | 850 | if (tsecr) { |
626e264d IJ |
851 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
852 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
853 | *topt++ = htonl(tsval); |
854 | *topt++ = htonl(tsecr); | |
626e264d IJ |
855 | } |
856 | ||
cfb6eeb4 YH |
857 | #ifdef CONFIG_TCP_MD5SIG |
858 | if (key) { | |
81ada62d IJ |
859 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
860 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
861 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
862 | &ipv6_hdr(skb)->saddr, |
863 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
864 | } |
865 | #endif | |
866 | ||
4c9483b2 | 867 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
868 | fl6.daddr = ipv6_hdr(skb)->saddr; |
869 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 870 | fl6.flowlabel = label; |
1da177e4 | 871 | |
e5700aff DM |
872 | buff->ip_summed = CHECKSUM_PARTIAL; |
873 | buff->csum = 0; | |
874 | ||
4c9483b2 | 875 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 876 | |
4c9483b2 | 877 | fl6.flowi6_proto = IPPROTO_TCP; |
a36dbdb2 | 878 | if (rt6_need_strict(&fl6.daddr) && !oif) |
870c3151 | 879 | fl6.flowi6_oif = tcp_v6_iif(skb); |
9b6c14d5 DA |
880 | else { |
881 | if (!oif && netif_index_is_l3_master(net, skb->skb_iif)) | |
882 | oif = skb->skb_iif; | |
883 | ||
884 | fl6.flowi6_oif = oif; | |
885 | } | |
1d2f7b2d | 886 | |
c67b8555 ED |
887 | if (sk) { |
888 | if (sk->sk_state == TCP_TIME_WAIT) { | |
889 | mark = inet_twsk(sk)->tw_mark; | |
890 | /* autoflowlabel relies on buff->hash */ | |
891 | skb_set_hash(buff, inet_twsk(sk)->tw_txhash, | |
892 | PKT_HASH_TYPE_L4); | |
893 | } else { | |
894 | mark = sk->sk_mark; | |
895 | } | |
d6fb396c | 896 | buff->tstamp = tcp_transmit_time(sk); |
c67b8555 | 897 | } |
00483690 | 898 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark) ?: mark; |
1958b856 DM |
899 | fl6.fl6_dport = t1->dest; |
900 | fl6.fl6_sport = t1->source; | |
e2d118a1 | 901 | fl6.flowi6_uid = sock_net_uid(net, sk && sk_fullsock(sk) ? sk : NULL); |
4c9483b2 | 902 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 903 | |
c20121ae DL |
904 | /* Pass a socket to ip6_dst_lookup either it is for RST |
905 | * Underlying function will use this to retrieve the network | |
906 | * namespace | |
907 | */ | |
0e0d44ab | 908 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
909 | if (!IS_ERR(dst)) { |
910 | skb_dst_set(buff, dst); | |
4f6570d7 | 911 | ip6_xmit(ctl_sk, buff, &fl6, fl6.flowi6_mark, NULL, tclass, |
e9a5dcee | 912 | priority); |
c10d9310 | 913 | TCP_INC_STATS(net, TCP_MIB_OUTSEGS); |
68d0c6d3 | 914 | if (rst) |
c10d9310 | 915 | TCP_INC_STATS(net, TCP_MIB_OUTRSTS); |
68d0c6d3 | 916 | return; |
1da177e4 LT |
917 | } |
918 | ||
919 | kfree_skb(buff); | |
920 | } | |
921 | ||
a00e7444 | 922 | static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) |
1da177e4 | 923 | { |
cf533ea5 | 924 | const struct tcphdr *th = tcp_hdr(skb); |
323a53c4 | 925 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
626e264d | 926 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 927 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
928 | #ifdef CONFIG_TCP_MD5SIG |
929 | const __u8 *hash_location = NULL; | |
658ddaaf SL |
930 | unsigned char newhash[16]; |
931 | int genhash; | |
932 | struct sock *sk1 = NULL; | |
933 | #endif | |
323a53c4 | 934 | __be32 label = 0; |
e9a5dcee | 935 | u32 priority = 0; |
323a53c4 | 936 | struct net *net; |
c24b14c4 | 937 | int oif = 0; |
1da177e4 | 938 | |
626e264d | 939 | if (th->rst) |
1da177e4 LT |
940 | return; |
941 | ||
c3658e8d ED |
942 | /* If sk not NULL, it means we did a successful lookup and incoming |
943 | * route had to be correct. prequeue might have dropped our dst. | |
944 | */ | |
945 | if (!sk && !ipv6_unicast_destination(skb)) | |
626e264d | 946 | return; |
1da177e4 | 947 | |
39209673 | 948 | net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
cfb6eeb4 | 949 | #ifdef CONFIG_TCP_MD5SIG |
3b24d854 | 950 | rcu_read_lock(); |
658ddaaf | 951 | hash_location = tcp_parse_md5sig_option(th); |
271c3b9b | 952 | if (sk && sk_fullsock(sk)) { |
e46787f0 FW |
953 | key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr); |
954 | } else if (hash_location) { | |
658ddaaf SL |
955 | /* |
956 | * active side is lost. Try to find listening socket through | |
957 | * source port, and then find md5 key through listening socket. | |
958 | * we are not loose security here: | |
959 | * Incoming packet is checked with md5 hash with finding key, | |
960 | * no RST generated if md5 hash doesn't match. | |
961 | */ | |
323a53c4 | 962 | sk1 = inet6_lookup_listener(net, |
a583636a CG |
963 | &tcp_hashinfo, NULL, 0, |
964 | &ipv6h->saddr, | |
5ba24953 | 965 | th->source, &ipv6h->daddr, |
24b711ed DA |
966 | ntohs(th->source), |
967 | tcp_v6_iif_l3_slave(skb), | |
4297a0ef | 968 | tcp_v6_sdif(skb)); |
658ddaaf | 969 | if (!sk1) |
3b24d854 | 970 | goto out; |
658ddaaf | 971 | |
658ddaaf SL |
972 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); |
973 | if (!key) | |
3b24d854 | 974 | goto out; |
658ddaaf | 975 | |
39f8e58e | 976 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb); |
658ddaaf | 977 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
3b24d854 | 978 | goto out; |
658ddaaf | 979 | } |
cfb6eeb4 YH |
980 | #endif |
981 | ||
626e264d IJ |
982 | if (th->ack) |
983 | seq = ntohl(th->ack_seq); | |
984 | else | |
985 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
986 | (th->doff << 2); | |
1da177e4 | 987 | |
c24b14c4 SL |
988 | if (sk) { |
989 | oif = sk->sk_bound_dev_if; | |
052e0690 ED |
990 | if (sk_fullsock(sk)) { |
991 | const struct ipv6_pinfo *np = tcp_inet6_sk(sk); | |
992 | ||
5c487bb9 | 993 | trace_tcp_send_reset(sk, skb); |
052e0690 ED |
994 | if (np->repflow) |
995 | label = ip6_flowlabel(ipv6h); | |
e9a5dcee | 996 | priority = sk->sk_priority; |
052e0690 | 997 | } |
50a8accf ED |
998 | if (sk->sk_state == TCP_TIME_WAIT) |
999 | label = cpu_to_be32(inet_twsk(sk)->tw_flowlabel); | |
323a53c4 | 1000 | } else { |
a346abe0 | 1001 | if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_TCP_RESET) |
323a53c4 | 1002 | label = ip6_flowlabel(ipv6h); |
c24b14c4 SL |
1003 | } |
1004 | ||
323a53c4 | 1005 | tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, |
e9a5dcee | 1006 | label, priority); |
658ddaaf SL |
1007 | |
1008 | #ifdef CONFIG_TCP_MD5SIG | |
3b24d854 ED |
1009 | out: |
1010 | rcu_read_unlock(); | |
658ddaaf | 1011 | #endif |
626e264d | 1012 | } |
1da177e4 | 1013 | |
a00e7444 | 1014 | static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae | 1015 | u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, |
1d13a96c | 1016 | struct tcp_md5sig_key *key, u8 tclass, |
e9a5dcee | 1017 | __be32 label, u32 priority) |
626e264d | 1018 | { |
0f85feae | 1019 | tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0, |
e9a5dcee | 1020 | tclass, label, priority); |
1da177e4 LT |
1021 | } |
1022 | ||
1023 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1024 | { | |
8feaf0c0 | 1025 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 1026 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 1027 | |
0f85feae | 1028 | tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 1029 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
9a568de4 | 1030 | tcp_time_stamp_raw() + tcptw->tw_ts_offset, |
9c76a114 | 1031 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
e9a5dcee | 1032 | tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel), 0); |
1da177e4 | 1033 | |
8feaf0c0 | 1034 | inet_twsk_put(tw); |
1da177e4 LT |
1035 | } |
1036 | ||
a00e7444 | 1037 | static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, |
6edafaaf | 1038 | struct request_sock *req) |
1da177e4 | 1039 | { |
3a19ce0e DL |
1040 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
1041 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
1042 | */ | |
20a2b49f ED |
1043 | /* RFC 7323 2.3 |
1044 | * The window field (SEG.WND) of every outgoing segment, with the | |
1045 | * exception of <SYN> segments, MUST be right-shifted by | |
1046 | * Rcv.Wind.Shift bits: | |
1047 | */ | |
0f85feae | 1048 | tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ? |
3a19ce0e | 1049 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
20a2b49f ED |
1050 | tcp_rsk(req)->rcv_nxt, |
1051 | req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale, | |
9a568de4 | 1052 | tcp_time_stamp_raw() + tcp_rsk(req)->ts_off, |
95a22cae | 1053 | req->ts_recent, sk->sk_bound_dev_if, |
30791ac4 | 1054 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr), |
e9a5dcee | 1055 | 0, 0, sk->sk_priority); |
1da177e4 LT |
1056 | } |
1057 | ||
1058 | ||
079096f1 | 1059 | static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1060 | { |
079096f1 | 1061 | #ifdef CONFIG_SYN_COOKIES |
aa8223c7 | 1062 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 1063 | |
af9b4738 | 1064 | if (!th->syn) |
c6aefafb | 1065 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1066 | #endif |
1067 | return sk; | |
1068 | } | |
1069 | ||
9349d600 PP |
1070 | u16 tcp_v6_get_syncookie(struct sock *sk, struct ipv6hdr *iph, |
1071 | struct tcphdr *th, u32 *cookie) | |
1072 | { | |
1073 | u16 mss = 0; | |
1074 | #ifdef CONFIG_SYN_COOKIES | |
1075 | mss = tcp_get_syncookie_mss(&tcp6_request_sock_ops, | |
1076 | &tcp_request_sock_ipv6_ops, sk, th); | |
1077 | if (mss) { | |
1078 | *cookie = __cookie_v6_init_sequence(iph, th, &mss); | |
1079 | tcp_synq_overflow(sk); | |
1080 | } | |
1081 | #endif | |
1082 | return mss; | |
1083 | } | |
1084 | ||
1da177e4 LT |
1085 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
1086 | { | |
1da177e4 LT |
1087 | if (skb->protocol == htons(ETH_P_IP)) |
1088 | return tcp_v4_conn_request(sk, skb); | |
1089 | ||
1090 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1091 | goto drop; |
1da177e4 | 1092 | |
1fb6f159 OP |
1093 | return tcp_conn_request(&tcp6_request_sock_ops, |
1094 | &tcp_request_sock_ipv6_ops, sk, skb); | |
1da177e4 LT |
1095 | |
1096 | drop: | |
9caad864 | 1097 | tcp_listendrop(sk); |
1da177e4 LT |
1098 | return 0; /* don't send reset */ |
1099 | } | |
1100 | ||
ebf6c9cb ED |
1101 | static void tcp_v6_restore_cb(struct sk_buff *skb) |
1102 | { | |
1103 | /* We need to move header back to the beginning if xfrm6_policy_check() | |
1104 | * and tcp_v6_fill_cb() are going to be called again. | |
1105 | * ip6_datagram_recv_specific_ctl() also expects IP6CB to be there. | |
1106 | */ | |
1107 | memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6, | |
1108 | sizeof(struct inet6_skb_parm)); | |
1109 | } | |
1110 | ||
0c27171e | 1111 | static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, |
4c99aa40 | 1112 | struct request_sock *req, |
5e0724d0 ED |
1113 | struct dst_entry *dst, |
1114 | struct request_sock *req_unhash, | |
1115 | bool *own_req) | |
1da177e4 | 1116 | { |
634fb979 | 1117 | struct inet_request_sock *ireq; |
0c27171e | 1118 | struct ipv6_pinfo *newnp; |
93a77c11 | 1119 | const struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
45f6fad8 | 1120 | struct ipv6_txoptions *opt; |
1da177e4 LT |
1121 | struct inet_sock *newinet; |
1122 | struct tcp_sock *newtp; | |
1123 | struct sock *newsk; | |
cfb6eeb4 YH |
1124 | #ifdef CONFIG_TCP_MD5SIG |
1125 | struct tcp_md5sig_key *key; | |
1126 | #endif | |
3840a06e | 1127 | struct flowi6 fl6; |
1da177e4 LT |
1128 | |
1129 | if (skb->protocol == htons(ETH_P_IP)) { | |
1130 | /* | |
1131 | * v6 mapped | |
1132 | */ | |
1133 | ||
5e0724d0 ED |
1134 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst, |
1135 | req_unhash, own_req); | |
1da177e4 | 1136 | |
63159f29 | 1137 | if (!newsk) |
1da177e4 LT |
1138 | return NULL; |
1139 | ||
93a77c11 | 1140 | inet_sk(newsk)->pinet6 = tcp_inet6_sk(newsk); |
1da177e4 LT |
1141 | |
1142 | newinet = inet_sk(newsk); | |
93a77c11 | 1143 | newnp = tcp_inet6_sk(newsk); |
1da177e4 LT |
1144 | newtp = tcp_sk(newsk); |
1145 | ||
1146 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1147 | ||
d1e559d0 | 1148 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
1da177e4 | 1149 | |
8292a17a | 1150 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1151 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1152 | #ifdef CONFIG_TCP_MD5SIG |
1153 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1154 | #endif | |
1155 | ||
83eaddab | 1156 | newnp->ipv6_mc_list = NULL; |
676a1184 YZ |
1157 | newnp->ipv6_ac_list = NULL; |
1158 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1159 | newnp->pktoptions = NULL; |
1160 | newnp->opt = NULL; | |
89e41309 ED |
1161 | newnp->mcast_oif = inet_iif(skb); |
1162 | newnp->mcast_hops = ip_hdr(skb)->ttl; | |
1163 | newnp->rcv_flowinfo = 0; | |
df3687ff | 1164 | if (np->repflow) |
89e41309 | 1165 | newnp->flow_label = 0; |
1da177e4 | 1166 | |
e6848976 ACM |
1167 | /* |
1168 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1169 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1170 | * that function for the gory details. -acme | |
1da177e4 | 1171 | */ |
1da177e4 LT |
1172 | |
1173 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1174 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1175 | Sync it now. |
1176 | */ | |
d83d8461 | 1177 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1178 | |
1179 | return newsk; | |
1180 | } | |
1181 | ||
634fb979 | 1182 | ireq = inet_rsk(req); |
1da177e4 LT |
1183 | |
1184 | if (sk_acceptq_is_full(sk)) | |
1185 | goto out_overflow; | |
1186 | ||
493f377d | 1187 | if (!dst) { |
f76b33c3 | 1188 | dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_TCP); |
493f377d | 1189 | if (!dst) |
1da177e4 | 1190 | goto out; |
1ab1457c | 1191 | } |
1da177e4 LT |
1192 | |
1193 | newsk = tcp_create_openreq_child(sk, req, skb); | |
63159f29 | 1194 | if (!newsk) |
093d2823 | 1195 | goto out_nonewsk; |
1da177e4 | 1196 | |
e6848976 ACM |
1197 | /* |
1198 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1199 | * count here, tcp_create_openreq_child now does this for us, see the | |
1200 | * comment in that function for the gory details. -acme | |
1201 | */ | |
1da177e4 | 1202 | |
59eed279 | 1203 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
6bd4f355 | 1204 | ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1205 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 | 1206 | |
93a77c11 | 1207 | inet_sk(newsk)->pinet6 = tcp_inet6_sk(newsk); |
1da177e4 LT |
1208 | |
1209 | newtp = tcp_sk(newsk); | |
1210 | newinet = inet_sk(newsk); | |
93a77c11 | 1211 | newnp = tcp_inet6_sk(newsk); |
1da177e4 LT |
1212 | |
1213 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1214 | ||
634fb979 ED |
1215 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1216 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1217 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1218 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1219 | |
1ab1457c | 1220 | /* Now IPv6 options... |
1da177e4 LT |
1221 | |
1222 | First: no IPv4 options. | |
1223 | */ | |
f6d8bd05 | 1224 | newinet->inet_opt = NULL; |
83eaddab | 1225 | newnp->ipv6_mc_list = NULL; |
676a1184 | 1226 | newnp->ipv6_ac_list = NULL; |
d35690be | 1227 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1228 | |
1229 | /* Clone RX bits */ | |
1230 | newnp->rxopt.all = np->rxopt.all; | |
1231 | ||
1da177e4 | 1232 | newnp->pktoptions = NULL; |
1da177e4 | 1233 | newnp->opt = NULL; |
870c3151 | 1234 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1235 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1236 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1237 | if (np->repflow) |
1238 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 LT |
1239 | |
1240 | /* Clone native IPv6 options from listening socket (if any) | |
1241 | ||
1242 | Yes, keeping reference count would be much more clever, | |
1243 | but we make one more one thing there: reattach optmem | |
1244 | to newsk. | |
1245 | */ | |
56ac42bc HD |
1246 | opt = ireq->ipv6_opt; |
1247 | if (!opt) | |
1248 | opt = rcu_dereference(np->opt); | |
45f6fad8 ED |
1249 | if (opt) { |
1250 | opt = ipv6_dup_options(newsk, opt); | |
1251 | RCU_INIT_POINTER(newnp->opt, opt); | |
1252 | } | |
d83d8461 | 1253 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
1254 | if (opt) |
1255 | inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen + | |
1256 | opt->opt_flen; | |
1da177e4 | 1257 | |
81164413 DB |
1258 | tcp_ca_openreq_child(newsk, dst); |
1259 | ||
1da177e4 | 1260 | tcp_sync_mss(newsk, dst_mtu(dst)); |
3541f9e8 | 1261 | newtp->advmss = tcp_mss_clamp(tcp_sk(sk), dst_metric_advmss(dst)); |
d135c522 | 1262 | |
1da177e4 LT |
1263 | tcp_initialize_rcv_mss(newsk); |
1264 | ||
c720c7e8 ED |
1265 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1266 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1267 | |
cfb6eeb4 YH |
1268 | #ifdef CONFIG_TCP_MD5SIG |
1269 | /* Copy over the MD5 key from the original socket */ | |
4aa956d8 | 1270 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr); |
53b24b8f | 1271 | if (key) { |
cfb6eeb4 YH |
1272 | /* We're using one, so create a matching key |
1273 | * on the newsk structure. If we fail to get | |
1274 | * memory, then we end up not copying the key | |
1275 | * across. Shucks. | |
1276 | */ | |
efe4208f | 1277 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
6797318e | 1278 | AF_INET6, 128, key->key, key->keylen, |
7450aaf6 | 1279 | sk_gfp_mask(sk, GFP_ATOMIC)); |
cfb6eeb4 YH |
1280 | } |
1281 | #endif | |
1282 | ||
093d2823 | 1283 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1284 | inet_csk_prepare_forced_close(newsk); |
1285 | tcp_done(newsk); | |
093d2823 BS |
1286 | goto out; |
1287 | } | |
5e0724d0 | 1288 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); |
805c4bc0 | 1289 | if (*own_req) { |
49a496c9 | 1290 | tcp_move_syn(newtp, req); |
805c4bc0 ED |
1291 | |
1292 | /* Clone pktoptions received with SYN, if we own the req */ | |
1293 | if (ireq->pktopts) { | |
1294 | newnp->pktoptions = skb_clone(ireq->pktopts, | |
7450aaf6 | 1295 | sk_gfp_mask(sk, GFP_ATOMIC)); |
805c4bc0 ED |
1296 | consume_skb(ireq->pktopts); |
1297 | ireq->pktopts = NULL; | |
ebf6c9cb ED |
1298 | if (newnp->pktoptions) { |
1299 | tcp_v6_restore_cb(newnp->pktoptions); | |
805c4bc0 | 1300 | skb_set_owner_r(newnp->pktoptions, newsk); |
ebf6c9cb | 1301 | } |
805c4bc0 | 1302 | } |
ce105008 | 1303 | } |
1da177e4 LT |
1304 | |
1305 | return newsk; | |
1306 | ||
1307 | out_overflow: | |
02a1d6e7 | 1308 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1309 | out_nonewsk: |
1da177e4 | 1310 | dst_release(dst); |
093d2823 | 1311 | out: |
9caad864 | 1312 | tcp_listendrop(sk); |
1da177e4 LT |
1313 | return NULL; |
1314 | } | |
1315 | ||
1da177e4 | 1316 | /* The socket must have it's spinlock held when we get |
e994b2f0 | 1317 | * here, unless it is a TCP_LISTEN socket. |
1da177e4 LT |
1318 | * |
1319 | * We have a potential double-lock case here, so even when | |
1320 | * doing backlog processing we use the BH locking scheme. | |
1321 | * This is because we cannot sleep with the original spinlock | |
1322 | * held. | |
1323 | */ | |
1324 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1325 | { | |
93a77c11 | 1326 | struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
1da177e4 | 1327 | struct sk_buff *opt_skb = NULL; |
93a77c11 | 1328 | struct tcp_sock *tp; |
1da177e4 LT |
1329 | |
1330 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1331 | goes to IPv4 receive handler and backlogged. | |
1332 | From backlog it always goes here. Kerboom... | |
1333 | Fortunately, tcp_rcv_established and rcv_established | |
1334 | handle them correctly, but it is not case with | |
1335 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1336 | */ | |
1337 | ||
1338 | if (skb->protocol == htons(ETH_P_IP)) | |
1339 | return tcp_v4_do_rcv(sk, skb); | |
1340 | ||
1da177e4 LT |
1341 | /* |
1342 | * socket locking is here for SMP purposes as backlog rcv | |
1343 | * is currently called with bh processing disabled. | |
1344 | */ | |
1345 | ||
1346 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1347 | ||
1348 | Yes, guys, it is the only place in our code, where we | |
1349 | may make it not affecting IPv4. | |
1350 | The rest of code is protocol independent, | |
1351 | and I do not like idea to uglify IPv4. | |
1352 | ||
1353 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1354 | looks not very well thought. For now we latch | |
1355 | options, received in the last packet, enqueued | |
1356 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1357 | --ANK (980728) |
1da177e4 LT |
1358 | */ |
1359 | if (np->rxopt.all) | |
7450aaf6 | 1360 | opt_skb = skb_clone(skb, sk_gfp_mask(sk, GFP_ATOMIC)); |
1da177e4 LT |
1361 | |
1362 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1363 | struct dst_entry *dst = sk->sk_rx_dst; |
1364 | ||
bdeab991 | 1365 | sock_rps_save_rxhash(sk, skb); |
3d97379a | 1366 | sk_mark_napi_id(sk, skb); |
5d299f3d ED |
1367 | if (dst) { |
1368 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1369 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1370 | dst_release(dst); | |
1371 | sk->sk_rx_dst = NULL; | |
1372 | } | |
1373 | } | |
1374 | ||
3d97d88e | 1375 | tcp_rcv_established(sk, skb); |
1da177e4 LT |
1376 | if (opt_skb) |
1377 | goto ipv6_pktoptions; | |
1378 | return 0; | |
1379 | } | |
1380 | ||
12e25e10 | 1381 | if (tcp_checksum_complete(skb)) |
1da177e4 LT |
1382 | goto csum_err; |
1383 | ||
1ab1457c | 1384 | if (sk->sk_state == TCP_LISTEN) { |
079096f1 ED |
1385 | struct sock *nsk = tcp_v6_cookie_check(sk, skb); |
1386 | ||
1da177e4 LT |
1387 | if (!nsk) |
1388 | goto discard; | |
1389 | ||
4c99aa40 | 1390 | if (nsk != sk) { |
1da177e4 LT |
1391 | if (tcp_child_process(sk, nsk, skb)) |
1392 | goto reset; | |
1393 | if (opt_skb) | |
1394 | __kfree_skb(opt_skb); | |
1395 | return 0; | |
1396 | } | |
47482f13 | 1397 | } else |
bdeab991 | 1398 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1399 | |
72ab4a86 | 1400 | if (tcp_rcv_state_process(sk, skb)) |
1da177e4 | 1401 | goto reset; |
1da177e4 LT |
1402 | if (opt_skb) |
1403 | goto ipv6_pktoptions; | |
1404 | return 0; | |
1405 | ||
1406 | reset: | |
cfb6eeb4 | 1407 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1408 | discard: |
1409 | if (opt_skb) | |
1410 | __kfree_skb(opt_skb); | |
1411 | kfree_skb(skb); | |
1412 | return 0; | |
1413 | csum_err: | |
c10d9310 ED |
1414 | TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS); |
1415 | TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS); | |
1da177e4 LT |
1416 | goto discard; |
1417 | ||
1418 | ||
1419 | ipv6_pktoptions: | |
1420 | /* Do you ask, what is it? | |
1421 | ||
1422 | 1. skb was enqueued by tcp. | |
1423 | 2. skb is added to tail of read queue, rather than out of order. | |
1424 | 3. socket is not in passive state. | |
1425 | 4. Finally, it really contains options, which user wants to receive. | |
1426 | */ | |
1427 | tp = tcp_sk(sk); | |
1428 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1429 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1430 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
870c3151 | 1431 | np->mcast_oif = tcp_v6_iif(opt_skb); |
333fad53 | 1432 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1433 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
82e9f105 | 1434 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1435 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
df3687ff FF |
1436 | if (np->repflow) |
1437 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
a224772d | 1438 | if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) { |
1da177e4 | 1439 | skb_set_owner_r(opt_skb, sk); |
8ce48623 | 1440 | tcp_v6_restore_cb(opt_skb); |
1da177e4 LT |
1441 | opt_skb = xchg(&np->pktoptions, opt_skb); |
1442 | } else { | |
1443 | __kfree_skb(opt_skb); | |
1444 | opt_skb = xchg(&np->pktoptions, NULL); | |
1445 | } | |
1446 | } | |
1447 | ||
800d55f1 | 1448 | kfree_skb(opt_skb); |
1da177e4 LT |
1449 | return 0; |
1450 | } | |
1451 | ||
2dc49d16 ND |
1452 | static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr, |
1453 | const struct tcphdr *th) | |
1454 | { | |
1455 | /* This is tricky: we move IP6CB at its correct location into | |
1456 | * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because | |
1457 | * _decode_session6() uses IP6CB(). | |
1458 | * barrier() makes sure compiler won't play aliasing games. | |
1459 | */ | |
1460 | memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb), | |
1461 | sizeof(struct inet6_skb_parm)); | |
1462 | barrier(); | |
1463 | ||
1464 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1465 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1466 | skb->len - th->doff*4); | |
1467 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1468 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); | |
1469 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; | |
1470 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); | |
1471 | TCP_SKB_CB(skb)->sacked = 0; | |
98aaa913 MM |
1472 | TCP_SKB_CB(skb)->has_rxtstamp = |
1473 | skb->tstamp || skb_hwtstamps(skb)->hwtstamp; | |
2dc49d16 ND |
1474 | } |
1475 | ||
0e219ae4 | 1476 | INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1477 | { |
8b27dae5 | 1478 | struct sk_buff *skb_to_free; |
4297a0ef | 1479 | int sdif = inet6_sdif(skb); |
cf533ea5 | 1480 | const struct tcphdr *th; |
b71d1d42 | 1481 | const struct ipv6hdr *hdr; |
3b24d854 | 1482 | bool refcounted; |
1da177e4 LT |
1483 | struct sock *sk; |
1484 | int ret; | |
a86b1e30 | 1485 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1486 | |
1487 | if (skb->pkt_type != PACKET_HOST) | |
1488 | goto discard_it; | |
1489 | ||
1490 | /* | |
1491 | * Count it even if it's bad. | |
1492 | */ | |
90bbcc60 | 1493 | __TCP_INC_STATS(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1494 | |
1495 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1496 | goto discard_it; | |
1497 | ||
ea1627c2 | 1498 | th = (const struct tcphdr *)skb->data; |
1da177e4 | 1499 | |
ea1627c2 | 1500 | if (unlikely(th->doff < sizeof(struct tcphdr)/4)) |
1da177e4 LT |
1501 | goto bad_packet; |
1502 | if (!pskb_may_pull(skb, th->doff*4)) | |
1503 | goto discard_it; | |
1504 | ||
e4f45b7f | 1505 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
6a5dc9e5 | 1506 | goto csum_error; |
1da177e4 | 1507 | |
ea1627c2 | 1508 | th = (const struct tcphdr *)skb->data; |
e802af9c | 1509 | hdr = ipv6_hdr(skb); |
1da177e4 | 1510 | |
4bdc3d66 | 1511 | lookup: |
a583636a | 1512 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, __tcp_hdrlen(th), |
4297a0ef | 1513 | th->source, th->dest, inet6_iif(skb), sdif, |
3b24d854 | 1514 | &refcounted); |
1da177e4 LT |
1515 | if (!sk) |
1516 | goto no_tcp_socket; | |
1517 | ||
1518 | process: | |
1519 | if (sk->sk_state == TCP_TIME_WAIT) | |
1520 | goto do_time_wait; | |
1521 | ||
079096f1 ED |
1522 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
1523 | struct request_sock *req = inet_reqsk(sk); | |
e0f9759f | 1524 | bool req_stolen = false; |
7716682c | 1525 | struct sock *nsk; |
079096f1 ED |
1526 | |
1527 | sk = req->rsk_listener; | |
079096f1 | 1528 | if (tcp_v6_inbound_md5_hash(sk, skb)) { |
e65c332d | 1529 | sk_drops_add(sk, skb); |
079096f1 ED |
1530 | reqsk_put(req); |
1531 | goto discard_it; | |
1532 | } | |
4fd44a98 FL |
1533 | if (tcp_checksum_complete(skb)) { |
1534 | reqsk_put(req); | |
1535 | goto csum_error; | |
1536 | } | |
7716682c | 1537 | if (unlikely(sk->sk_state != TCP_LISTEN)) { |
f03f2e15 | 1538 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
4bdc3d66 ED |
1539 | goto lookup; |
1540 | } | |
7716682c | 1541 | sock_hold(sk); |
3b24d854 | 1542 | refcounted = true; |
1f3b359f | 1543 | nsk = NULL; |
eeea10b8 ED |
1544 | if (!tcp_filter(sk, skb)) { |
1545 | th = (const struct tcphdr *)skb->data; | |
1546 | hdr = ipv6_hdr(skb); | |
1547 | tcp_v6_fill_cb(skb, hdr, th); | |
e0f9759f | 1548 | nsk = tcp_check_req(sk, skb, req, false, &req_stolen); |
eeea10b8 | 1549 | } |
079096f1 ED |
1550 | if (!nsk) { |
1551 | reqsk_put(req); | |
e0f9759f ED |
1552 | if (req_stolen) { |
1553 | /* Another cpu got exclusive access to req | |
1554 | * and created a full blown socket. | |
1555 | * Try to feed this packet to this socket | |
1556 | * instead of discarding it. | |
1557 | */ | |
1558 | tcp_v6_restore_cb(skb); | |
1559 | sock_put(sk); | |
1560 | goto lookup; | |
1561 | } | |
7716682c | 1562 | goto discard_and_relse; |
079096f1 ED |
1563 | } |
1564 | if (nsk == sk) { | |
079096f1 ED |
1565 | reqsk_put(req); |
1566 | tcp_v6_restore_cb(skb); | |
1567 | } else if (tcp_child_process(sk, nsk, skb)) { | |
1568 | tcp_v6_send_reset(nsk, skb); | |
7716682c | 1569 | goto discard_and_relse; |
079096f1 | 1570 | } else { |
7716682c | 1571 | sock_put(sk); |
079096f1 ED |
1572 | return 0; |
1573 | } | |
1574 | } | |
93a77c11 | 1575 | if (hdr->hop_limit < tcp_inet6_sk(sk)->min_hopcount) { |
02a1d6e7 | 1576 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
e802af9c SH |
1577 | goto discard_and_relse; |
1578 | } | |
1579 | ||
1da177e4 LT |
1580 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1581 | goto discard_and_relse; | |
1582 | ||
9ea88a15 DP |
1583 | if (tcp_v6_inbound_md5_hash(sk, skb)) |
1584 | goto discard_and_relse; | |
9ea88a15 | 1585 | |
ac6e7800 | 1586 | if (tcp_filter(sk, skb)) |
1da177e4 | 1587 | goto discard_and_relse; |
ac6e7800 ED |
1588 | th = (const struct tcphdr *)skb->data; |
1589 | hdr = ipv6_hdr(skb); | |
eeea10b8 | 1590 | tcp_v6_fill_cb(skb, hdr, th); |
1da177e4 LT |
1591 | |
1592 | skb->dev = NULL; | |
1593 | ||
e994b2f0 ED |
1594 | if (sk->sk_state == TCP_LISTEN) { |
1595 | ret = tcp_v6_do_rcv(sk, skb); | |
1596 | goto put_and_return; | |
1597 | } | |
1598 | ||
1599 | sk_incoming_cpu_update(sk); | |
1600 | ||
293b9c42 | 1601 | bh_lock_sock_nested(sk); |
a44d6eac | 1602 | tcp_segs_in(tcp_sk(sk), skb); |
1da177e4 LT |
1603 | ret = 0; |
1604 | if (!sock_owned_by_user(sk)) { | |
8b27dae5 ED |
1605 | skb_to_free = sk->sk_rx_skb_cache; |
1606 | sk->sk_rx_skb_cache = NULL; | |
e7942d06 | 1607 | ret = tcp_v6_do_rcv(sk, skb); |
8b27dae5 ED |
1608 | } else { |
1609 | if (tcp_add_backlog(sk, skb)) | |
1610 | goto discard_and_relse; | |
1611 | skb_to_free = NULL; | |
6b03a53a | 1612 | } |
1da177e4 | 1613 | bh_unlock_sock(sk); |
8b27dae5 ED |
1614 | if (skb_to_free) |
1615 | __kfree_skb(skb_to_free); | |
e994b2f0 | 1616 | put_and_return: |
3b24d854 ED |
1617 | if (refcounted) |
1618 | sock_put(sk); | |
1da177e4 LT |
1619 | return ret ? -1 : 0; |
1620 | ||
1621 | no_tcp_socket: | |
1622 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1623 | goto discard_it; | |
1624 | ||
2dc49d16 ND |
1625 | tcp_v6_fill_cb(skb, hdr, th); |
1626 | ||
12e25e10 | 1627 | if (tcp_checksum_complete(skb)) { |
6a5dc9e5 | 1628 | csum_error: |
90bbcc60 | 1629 | __TCP_INC_STATS(net, TCP_MIB_CSUMERRORS); |
1da177e4 | 1630 | bad_packet: |
90bbcc60 | 1631 | __TCP_INC_STATS(net, TCP_MIB_INERRS); |
1da177e4 | 1632 | } else { |
cfb6eeb4 | 1633 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1634 | } |
1635 | ||
1636 | discard_it: | |
1da177e4 LT |
1637 | kfree_skb(skb); |
1638 | return 0; | |
1639 | ||
1640 | discard_and_relse: | |
532182cd | 1641 | sk_drops_add(sk, skb); |
3b24d854 ED |
1642 | if (refcounted) |
1643 | sock_put(sk); | |
1da177e4 LT |
1644 | goto discard_it; |
1645 | ||
1646 | do_time_wait: | |
1647 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1648 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1649 | goto discard_it; |
1650 | } | |
1651 | ||
2dc49d16 ND |
1652 | tcp_v6_fill_cb(skb, hdr, th); |
1653 | ||
6a5dc9e5 ED |
1654 | if (tcp_checksum_complete(skb)) { |
1655 | inet_twsk_put(inet_twsk(sk)); | |
1656 | goto csum_error; | |
1da177e4 LT |
1657 | } |
1658 | ||
9469c7b4 | 1659 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1660 | case TCP_TW_SYN: |
1661 | { | |
1662 | struct sock *sk2; | |
1663 | ||
c346dca1 | 1664 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
a583636a | 1665 | skb, __tcp_hdrlen(th), |
5ba24953 | 1666 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1667 | &ipv6_hdr(skb)->daddr, |
24b711ed DA |
1668 | ntohs(th->dest), |
1669 | tcp_v6_iif_l3_slave(skb), | |
4297a0ef | 1670 | sdif); |
53b24b8f | 1671 | if (sk2) { |
295ff7ed | 1672 | struct inet_timewait_sock *tw = inet_twsk(sk); |
dbe7faa4 | 1673 | inet_twsk_deschedule_put(tw); |
1da177e4 | 1674 | sk = sk2; |
4ad19de8 | 1675 | tcp_v6_restore_cb(skb); |
3b24d854 | 1676 | refcounted = false; |
1da177e4 LT |
1677 | goto process; |
1678 | } | |
1da177e4 | 1679 | } |
275757e6 GS |
1680 | /* to ACK */ |
1681 | /* fall through */ | |
1da177e4 LT |
1682 | case TCP_TW_ACK: |
1683 | tcp_v6_timewait_ack(sk, skb); | |
1684 | break; | |
1685 | case TCP_TW_RST: | |
271c3b9b FW |
1686 | tcp_v6_send_reset(sk, skb); |
1687 | inet_twsk_deschedule_put(inet_twsk(sk)); | |
1688 | goto discard_it; | |
4aa956d8 WY |
1689 | case TCP_TW_SUCCESS: |
1690 | ; | |
1da177e4 LT |
1691 | } |
1692 | goto discard_it; | |
1693 | } | |
1694 | ||
97ff7ffb | 1695 | INDIRECT_CALLABLE_SCOPE void tcp_v6_early_demux(struct sk_buff *skb) |
c7109986 ED |
1696 | { |
1697 | const struct ipv6hdr *hdr; | |
1698 | const struct tcphdr *th; | |
1699 | struct sock *sk; | |
1700 | ||
1701 | if (skb->pkt_type != PACKET_HOST) | |
1702 | return; | |
1703 | ||
1704 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1705 | return; | |
1706 | ||
1707 | hdr = ipv6_hdr(skb); | |
1708 | th = tcp_hdr(skb); | |
1709 | ||
1710 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1711 | return; | |
1712 | ||
870c3151 | 1713 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
c7109986 ED |
1714 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
1715 | &hdr->saddr, th->source, | |
1716 | &hdr->daddr, ntohs(th->dest), | |
4297a0ef | 1717 | inet6_iif(skb), inet6_sdif(skb)); |
c7109986 ED |
1718 | if (sk) { |
1719 | skb->sk = sk; | |
1720 | skb->destructor = sock_edemux; | |
f7e4eb03 | 1721 | if (sk_fullsock(sk)) { |
d0c294c5 | 1722 | struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst); |
f3f12135 | 1723 | |
c7109986 | 1724 | if (dst) |
93a77c11 | 1725 | dst = dst_check(dst, tcp_inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1726 | if (dst && |
f3f12135 | 1727 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1728 | skb_dst_set_noref(skb, dst); |
1729 | } | |
1730 | } | |
1731 | } | |
1732 | ||
ccb7c410 DM |
1733 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1734 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1735 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 1736 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
1737 | }; |
1738 | ||
3b401a81 | 1739 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1740 | .queue_xmit = inet6_csk_xmit, |
1741 | .send_check = tcp_v6_send_check, | |
1742 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1743 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1744 | .conn_request = tcp_v6_conn_request, |
1745 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1746 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1747 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1748 | .setsockopt = ipv6_setsockopt, |
1749 | .getsockopt = ipv6_getsockopt, | |
1750 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1751 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1752 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1753 | .compat_setsockopt = compat_ipv6_setsockopt, |
1754 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1755 | #endif |
4fab9071 | 1756 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 LT |
1757 | }; |
1758 | ||
cfb6eeb4 | 1759 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1760 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1761 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1762 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1763 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1764 | }; |
a928630a | 1765 | #endif |
cfb6eeb4 | 1766 | |
1da177e4 LT |
1767 | /* |
1768 | * TCP over IPv4 via INET6 API | |
1769 | */ | |
3b401a81 | 1770 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1771 | .queue_xmit = ip_queue_xmit, |
1772 | .send_check = tcp_v4_send_check, | |
1773 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1774 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1775 | .conn_request = tcp_v6_conn_request, |
1776 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1777 | .net_header_len = sizeof(struct iphdr), |
1778 | .setsockopt = ipv6_setsockopt, | |
1779 | .getsockopt = ipv6_getsockopt, | |
1780 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1781 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1782 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1783 | .compat_setsockopt = compat_ipv6_setsockopt, |
1784 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1785 | #endif |
4fab9071 | 1786 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 LT |
1787 | }; |
1788 | ||
cfb6eeb4 | 1789 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1790 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1791 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1792 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1793 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1794 | }; |
a928630a | 1795 | #endif |
cfb6eeb4 | 1796 | |
1da177e4 LT |
1797 | /* NOTE: A lot of things set to zero explicitly by call to |
1798 | * sk_alloc() so need not be done here. | |
1799 | */ | |
1800 | static int tcp_v6_init_sock(struct sock *sk) | |
1801 | { | |
6687e988 | 1802 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1803 | |
900f65d3 | 1804 | tcp_init_sock(sk); |
1da177e4 | 1805 | |
8292a17a | 1806 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1807 | |
cfb6eeb4 | 1808 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1809 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1810 | #endif |
1811 | ||
1da177e4 LT |
1812 | return 0; |
1813 | } | |
1814 | ||
7d06b2e0 | 1815 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1816 | { |
1da177e4 | 1817 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1818 | inet6_destroy_sock(sk); |
1da177e4 LT |
1819 | } |
1820 | ||
952a10be | 1821 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1822 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1823 | static void get_openreq6(struct seq_file *seq, |
aa3a0c8c | 1824 | const struct request_sock *req, int i) |
1da177e4 | 1825 | { |
fa76ce73 | 1826 | long ttd = req->rsk_timer.expires - jiffies; |
634fb979 ED |
1827 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1828 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1829 | |
1830 | if (ttd < 0) | |
1831 | ttd = 0; | |
1832 | ||
1da177e4 LT |
1833 | seq_printf(seq, |
1834 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1835 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1836 | i, |
1837 | src->s6_addr32[0], src->s6_addr32[1], | |
1838 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1839 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1840 | dest->s6_addr32[0], dest->s6_addr32[1], |
1841 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1842 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 1843 | TCP_SYN_RECV, |
4c99aa40 | 1844 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
1845 | 1, /* timers active (only the expire timer) */ |
1846 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1847 | req->num_timeout, |
aa3a0c8c ED |
1848 | from_kuid_munged(seq_user_ns(seq), |
1849 | sock_i_uid(req->rsk_listener)), | |
1ab1457c | 1850 | 0, /* non standard timer */ |
1da177e4 LT |
1851 | 0, /* open_requests have no inode */ |
1852 | 0, req); | |
1853 | } | |
1854 | ||
1855 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1856 | { | |
b71d1d42 | 1857 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1858 | __u16 destp, srcp; |
1859 | int timer_active; | |
1860 | unsigned long timer_expires; | |
cf533ea5 ED |
1861 | const struct inet_sock *inet = inet_sk(sp); |
1862 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1863 | const struct inet_connection_sock *icsk = inet_csk(sp); |
0536fcc0 | 1864 | const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq; |
00fd38d9 ED |
1865 | int rx_queue; |
1866 | int state; | |
1da177e4 | 1867 | |
efe4208f ED |
1868 | dest = &sp->sk_v6_daddr; |
1869 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1870 | destp = ntohs(inet->inet_dport); |
1871 | srcp = ntohs(inet->inet_sport); | |
463c84b9 | 1872 | |
ce3cf4ec | 1873 | if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
57dde7f7 | 1874 | icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT || |
ce3cf4ec | 1875 | icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { |
1da177e4 | 1876 | timer_active = 1; |
463c84b9 ACM |
1877 | timer_expires = icsk->icsk_timeout; |
1878 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1879 | timer_active = 4; |
463c84b9 | 1880 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1881 | } else if (timer_pending(&sp->sk_timer)) { |
1882 | timer_active = 2; | |
1883 | timer_expires = sp->sk_timer.expires; | |
1884 | } else { | |
1885 | timer_active = 0; | |
1886 | timer_expires = jiffies; | |
1887 | } | |
1888 | ||
986ffdfd | 1889 | state = inet_sk_state_load(sp); |
00fd38d9 ED |
1890 | if (state == TCP_LISTEN) |
1891 | rx_queue = sp->sk_ack_backlog; | |
1892 | else | |
1893 | /* Because we don't lock the socket, | |
1894 | * we might find a transient negative value. | |
1895 | */ | |
1896 | rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); | |
1897 | ||
1da177e4 LT |
1898 | seq_printf(seq, |
1899 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1900 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1901 | i, |
1902 | src->s6_addr32[0], src->s6_addr32[1], | |
1903 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1904 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1905 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
00fd38d9 ED |
1906 | state, |
1907 | tp->write_seq - tp->snd_una, | |
1908 | rx_queue, | |
1da177e4 | 1909 | timer_active, |
a399a805 | 1910 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1911 | icsk->icsk_retransmits, |
a7cb5a49 | 1912 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1913 | icsk->icsk_probes_out, |
1da177e4 | 1914 | sock_i_ino(sp), |
41c6d650 | 1915 | refcount_read(&sp->sk_refcnt), sp, |
7be87351 SH |
1916 | jiffies_to_clock_t(icsk->icsk_rto), |
1917 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
31954cd8 | 1918 | (icsk->icsk_ack.quick << 1) | inet_csk_in_pingpong_mode(sp), |
0b6a05c1 | 1919 | tp->snd_cwnd, |
00fd38d9 | 1920 | state == TCP_LISTEN ? |
0536fcc0 | 1921 | fastopenq->max_qlen : |
0a672f74 | 1922 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) |
1da177e4 LT |
1923 | ); |
1924 | } | |
1925 | ||
1ab1457c | 1926 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1927 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1928 | { |
789f558c | 1929 | long delta = tw->tw_timer.expires - jiffies; |
b71d1d42 | 1930 | const struct in6_addr *dest, *src; |
1da177e4 | 1931 | __u16 destp, srcp; |
1da177e4 | 1932 | |
efe4208f ED |
1933 | dest = &tw->tw_v6_daddr; |
1934 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1935 | destp = ntohs(tw->tw_dport); |
1936 | srcp = ntohs(tw->tw_sport); | |
1937 | ||
1938 | seq_printf(seq, | |
1939 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1940 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1941 | i, |
1942 | src->s6_addr32[0], src->s6_addr32[1], | |
1943 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1944 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1945 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1946 | tw->tw_substate, 0, 0, | |
a399a805 | 1947 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
41c6d650 | 1948 | refcount_read(&tw->tw_refcnt), tw); |
1da177e4 LT |
1949 | } |
1950 | ||
1da177e4 LT |
1951 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1952 | { | |
1953 | struct tcp_iter_state *st; | |
05dbc7b5 | 1954 | struct sock *sk = v; |
1da177e4 LT |
1955 | |
1956 | if (v == SEQ_START_TOKEN) { | |
1957 | seq_puts(seq, | |
1958 | " sl " | |
1959 | "local_address " | |
1960 | "remote_address " | |
1961 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1962 | " uid timeout inode\n"); | |
1963 | goto out; | |
1964 | } | |
1965 | st = seq->private; | |
1966 | ||
079096f1 ED |
1967 | if (sk->sk_state == TCP_TIME_WAIT) |
1968 | get_timewait6_sock(seq, v, st->num); | |
1969 | else if (sk->sk_state == TCP_NEW_SYN_RECV) | |
aa3a0c8c | 1970 | get_openreq6(seq, v, st->num); |
079096f1 ED |
1971 | else |
1972 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
1973 | out: |
1974 | return 0; | |
1975 | } | |
1976 | ||
37d849bb CH |
1977 | static const struct seq_operations tcp6_seq_ops = { |
1978 | .show = tcp6_seq_show, | |
1979 | .start = tcp_seq_start, | |
1980 | .next = tcp_seq_next, | |
1981 | .stop = tcp_seq_stop, | |
1982 | }; | |
1983 | ||
1da177e4 | 1984 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 | 1985 | .family = AF_INET6, |
1da177e4 LT |
1986 | }; |
1987 | ||
2c8c1e72 | 1988 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1989 | { |
c3506372 CH |
1990 | if (!proc_create_net_data("tcp6", 0444, net->proc_net, &tcp6_seq_ops, |
1991 | sizeof(struct tcp_iter_state), &tcp6_seq_afinfo)) | |
37d849bb CH |
1992 | return -ENOMEM; |
1993 | return 0; | |
1da177e4 LT |
1994 | } |
1995 | ||
6f8b13bc | 1996 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1997 | { |
37d849bb | 1998 | remove_proc_entry("tcp6", net->proc_net); |
1da177e4 LT |
1999 | } |
2000 | #endif | |
2001 | ||
2002 | struct proto tcpv6_prot = { | |
2003 | .name = "TCPv6", | |
2004 | .owner = THIS_MODULE, | |
2005 | .close = tcp_close, | |
d74bad4e | 2006 | .pre_connect = tcp_v6_pre_connect, |
1da177e4 LT |
2007 | .connect = tcp_v6_connect, |
2008 | .disconnect = tcp_disconnect, | |
463c84b9 | 2009 | .accept = inet_csk_accept, |
1da177e4 LT |
2010 | .ioctl = tcp_ioctl, |
2011 | .init = tcp_v6_init_sock, | |
2012 | .destroy = tcp_v6_destroy_sock, | |
2013 | .shutdown = tcp_shutdown, | |
2014 | .setsockopt = tcp_setsockopt, | |
2015 | .getsockopt = tcp_getsockopt, | |
4b9d07a4 | 2016 | .keepalive = tcp_set_keepalive, |
1da177e4 | 2017 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
2018 | .sendmsg = tcp_sendmsg, |
2019 | .sendpage = tcp_sendpage, | |
1da177e4 | 2020 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 2021 | .release_cb = tcp_release_cb, |
496611d7 | 2022 | .hash = inet6_hash, |
ab1e0a13 ACM |
2023 | .unhash = inet_unhash, |
2024 | .get_port = inet_csk_get_port, | |
1da177e4 | 2025 | .enter_memory_pressure = tcp_enter_memory_pressure, |
06044751 | 2026 | .leave_memory_pressure = tcp_leave_memory_pressure, |
c9bee3b7 | 2027 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
2028 | .sockets_allocated = &tcp_sockets_allocated, |
2029 | .memory_allocated = &tcp_memory_allocated, | |
2030 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2031 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 2032 | .sysctl_mem = sysctl_tcp_mem, |
356d1833 ED |
2033 | .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem), |
2034 | .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_tcp_rmem), | |
1da177e4 LT |
2035 | .max_header = MAX_TCP_HEADER, |
2036 | .obj_size = sizeof(struct tcp6_sock), | |
5f0d5a3a | 2037 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
6d6ee43e | 2038 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2039 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2040 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 2041 | .no_autobind = true, |
543d9cfe ACM |
2042 | #ifdef CONFIG_COMPAT |
2043 | .compat_setsockopt = compat_tcp_setsockopt, | |
2044 | .compat_getsockopt = compat_tcp_getsockopt, | |
d1a4c0b3 | 2045 | #endif |
c1e64e29 | 2046 | .diag_destroy = tcp_abort, |
1da177e4 LT |
2047 | }; |
2048 | ||
a8e3bb34 DA |
2049 | /* thinking of making this const? Don't. |
2050 | * early_demux can change based on sysctl. | |
2051 | */ | |
39294c3d | 2052 | static struct inet6_protocol tcpv6_protocol = { |
c7109986 | 2053 | .early_demux = tcp_v6_early_demux, |
dddb64bc | 2054 | .early_demux_handler = tcp_v6_early_demux, |
1da177e4 LT |
2055 | .handler = tcp_v6_rcv, |
2056 | .err_handler = tcp_v6_err, | |
2057 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
2058 | }; | |
2059 | ||
1da177e4 LT |
2060 | static struct inet_protosw tcpv6_protosw = { |
2061 | .type = SOCK_STREAM, | |
2062 | .protocol = IPPROTO_TCP, | |
2063 | .prot = &tcpv6_prot, | |
2064 | .ops = &inet6_stream_ops, | |
d83d8461 ACM |
2065 | .flags = INET_PROTOSW_PERMANENT | |
2066 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2067 | }; |
2068 | ||
2c8c1e72 | 2069 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 2070 | { |
5677242f DL |
2071 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2072 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2073 | } |
2074 | ||
2c8c1e72 | 2075 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 2076 | { |
5677242f | 2077 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
2078 | } |
2079 | ||
2c8c1e72 | 2080 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 | 2081 | { |
1946e672 | 2082 | inet_twsk_purge(&tcp_hashinfo, AF_INET6); |
93ec926b DL |
2083 | } |
2084 | ||
2085 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
2086 | .init = tcpv6_net_init, |
2087 | .exit = tcpv6_net_exit, | |
2088 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
2089 | }; |
2090 | ||
7f4e4868 | 2091 | int __init tcpv6_init(void) |
1da177e4 | 2092 | { |
7f4e4868 DL |
2093 | int ret; |
2094 | ||
3336288a VY |
2095 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
2096 | if (ret) | |
c6b641a4 | 2097 | goto out; |
3336288a | 2098 | |
1da177e4 | 2099 | /* register inet6 protocol */ |
7f4e4868 DL |
2100 | ret = inet6_register_protosw(&tcpv6_protosw); |
2101 | if (ret) | |
2102 | goto out_tcpv6_protocol; | |
2103 | ||
93ec926b | 2104 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2105 | if (ret) |
2106 | goto out_tcpv6_protosw; | |
2107 | out: | |
2108 | return ret; | |
ae0f7d5f | 2109 | |
7f4e4868 DL |
2110 | out_tcpv6_protosw: |
2111 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
2112 | out_tcpv6_protocol: |
2113 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
2114 | goto out; |
2115 | } | |
2116 | ||
09f7709f | 2117 | void tcpv6_exit(void) |
7f4e4868 | 2118 | { |
93ec926b | 2119 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2120 | inet6_unregister_protosw(&tcpv6_protosw); |
2121 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2122 | } |