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Commit | Line | Data |
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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 | 77 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
35b2c321 | 78 | 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, |
dea53bb8 DA |
84 | const struct in6_addr *addr, |
85 | int l3index) | |
9501f972 YH |
86 | { |
87 | return NULL; | |
88 | } | |
a928630a | 89 | #endif |
1da177e4 | 90 | |
93a77c11 ED |
91 | /* Helper returning the inet6 address from a given tcp socket. |
92 | * It can be used in TCP stack instead of inet6_sk(sk). | |
93 | * This avoids a dereference and allow compiler optimizations. | |
f5d54767 | 94 | * It is a specialized version of inet6_sk_generic(). |
93a77c11 ED |
95 | */ |
96 | static struct ipv6_pinfo *tcp_inet6_sk(const struct sock *sk) | |
97 | { | |
f5d54767 | 98 | unsigned int offset = sizeof(struct tcp6_sock) - sizeof(struct ipv6_pinfo); |
93a77c11 | 99 | |
f5d54767 | 100 | return (struct ipv6_pinfo *)(((u8 *)sk) + offset); |
93a77c11 ED |
101 | } |
102 | ||
fae6ef87 NC |
103 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
104 | { | |
105 | struct dst_entry *dst = skb_dst(skb); | |
fae6ef87 | 106 | |
5037e9ef | 107 | if (dst && dst_hold_safe(dst)) { |
ca777eff ED |
108 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
109 | ||
ca777eff ED |
110 | sk->sk_rx_dst = dst; |
111 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
93a77c11 | 112 | tcp_inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt); |
ca777eff | 113 | } |
fae6ef87 NC |
114 | } |
115 | ||
84b114b9 | 116 | static u32 tcp_v6_init_seq(const struct sk_buff *skb) |
1da177e4 | 117 | { |
84b114b9 ED |
118 | return secure_tcpv6_seq(ipv6_hdr(skb)->daddr.s6_addr32, |
119 | ipv6_hdr(skb)->saddr.s6_addr32, | |
120 | tcp_hdr(skb)->dest, | |
121 | tcp_hdr(skb)->source); | |
122 | } | |
123 | ||
5d2ed052 | 124 | static u32 tcp_v6_init_ts_off(const struct net *net, const struct sk_buff *skb) |
84b114b9 | 125 | { |
5d2ed052 | 126 | return secure_tcpv6_ts_off(net, ipv6_hdr(skb)->daddr.s6_addr32, |
84b114b9 | 127 | ipv6_hdr(skb)->saddr.s6_addr32); |
1da177e4 LT |
128 | } |
129 | ||
d74bad4e AI |
130 | static int tcp_v6_pre_connect(struct sock *sk, struct sockaddr *uaddr, |
131 | int addr_len) | |
132 | { | |
133 | /* This check is replicated from tcp_v6_connect() and intended to | |
134 | * prevent BPF program called below from accessing bytes that are out | |
135 | * of the bound specified by user in addr_len. | |
136 | */ | |
137 | if (addr_len < SIN6_LEN_RFC2133) | |
138 | return -EINVAL; | |
139 | ||
140 | sock_owned_by_me(sk); | |
141 | ||
142 | return BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr); | |
143 | } | |
144 | ||
1ab1457c | 145 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
146 | int addr_len) |
147 | { | |
148 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 149 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 150 | struct inet_connection_sock *icsk = inet_csk(sk); |
93a77c11 | 151 | struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
1da177e4 | 152 | struct tcp_sock *tp = tcp_sk(sk); |
20c59de2 | 153 | struct in6_addr *saddr = NULL, *final_p, final; |
45f6fad8 | 154 | struct ipv6_txoptions *opt; |
4c9483b2 | 155 | struct flowi6 fl6; |
1da177e4 LT |
156 | struct dst_entry *dst; |
157 | int addr_type; | |
158 | int err; | |
1946e672 | 159 | struct inet_timewait_death_row *tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row; |
1da177e4 | 160 | |
1ab1457c | 161 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
162 | return -EINVAL; |
163 | ||
1ab1457c | 164 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 165 | return -EAFNOSUPPORT; |
1da177e4 | 166 | |
4c9483b2 | 167 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
168 | |
169 | if (np->sndflow) { | |
4c9483b2 DM |
170 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
171 | IP6_ECN_flow_init(fl6.flowlabel); | |
172 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 173 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 174 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
59c820b2 | 175 | if (IS_ERR(flowlabel)) |
1da177e4 | 176 | return -EINVAL; |
1da177e4 LT |
177 | fl6_sock_release(flowlabel); |
178 | } | |
179 | } | |
180 | ||
181 | /* | |
1ab1457c YH |
182 | * connect() to INADDR_ANY means loopback (BSD'ism). |
183 | */ | |
184 | ||
052d2369 JL |
185 | if (ipv6_addr_any(&usin->sin6_addr)) { |
186 | if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) | |
187 | ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), | |
188 | &usin->sin6_addr); | |
189 | else | |
190 | usin->sin6_addr = in6addr_loopback; | |
191 | } | |
1da177e4 LT |
192 | |
193 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
194 | ||
4c99aa40 | 195 | if (addr_type & IPV6_ADDR_MULTICAST) |
1da177e4 LT |
196 | return -ENETUNREACH; |
197 | ||
198 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
199 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
200 | usin->sin6_scope_id) { | |
201 | /* If interface is set while binding, indices | |
202 | * must coincide. | |
203 | */ | |
54dc3e33 | 204 | if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id)) |
1da177e4 LT |
205 | return -EINVAL; |
206 | ||
207 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
208 | } | |
209 | ||
210 | /* Connect to link-local address requires an interface */ | |
211 | if (!sk->sk_bound_dev_if) | |
212 | return -EINVAL; | |
213 | } | |
214 | ||
215 | if (tp->rx_opt.ts_recent_stamp && | |
efe4208f | 216 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
1da177e4 LT |
217 | tp->rx_opt.ts_recent = 0; |
218 | tp->rx_opt.ts_recent_stamp = 0; | |
0f317464 | 219 | WRITE_ONCE(tp->write_seq, 0); |
1da177e4 LT |
220 | } |
221 | ||
efe4208f | 222 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 223 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
224 | |
225 | /* | |
226 | * TCP over IPv4 | |
227 | */ | |
228 | ||
052d2369 | 229 | if (addr_type & IPV6_ADDR_MAPPED) { |
d83d8461 | 230 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
231 | struct sockaddr_in sin; |
232 | ||
1da177e4 LT |
233 | if (__ipv6_only_sock(sk)) |
234 | return -ENETUNREACH; | |
235 | ||
236 | sin.sin_family = AF_INET; | |
237 | sin.sin_port = usin->sin6_port; | |
238 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
239 | ||
d83d8461 | 240 | icsk->icsk_af_ops = &ipv6_mapped; |
cec37a6e | 241 | if (sk_is_mptcp(sk)) |
31484d56 | 242 | mptcpv6_handle_mapped(sk, true); |
1da177e4 | 243 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
244 | #ifdef CONFIG_TCP_MD5SIG |
245 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
246 | #endif | |
1da177e4 LT |
247 | |
248 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
249 | ||
250 | if (err) { | |
d83d8461 ACM |
251 | icsk->icsk_ext_hdr_len = exthdrlen; |
252 | icsk->icsk_af_ops = &ipv6_specific; | |
cec37a6e | 253 | if (sk_is_mptcp(sk)) |
31484d56 | 254 | mptcpv6_handle_mapped(sk, false); |
1da177e4 | 255 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
256 | #ifdef CONFIG_TCP_MD5SIG |
257 | tp->af_specific = &tcp_sock_ipv6_specific; | |
258 | #endif | |
1da177e4 | 259 | goto failure; |
1da177e4 | 260 | } |
d1e559d0 | 261 | np->saddr = sk->sk_v6_rcv_saddr; |
1da177e4 LT |
262 | |
263 | return err; | |
264 | } | |
265 | ||
efe4208f ED |
266 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
267 | saddr = &sk->sk_v6_rcv_saddr; | |
1da177e4 | 268 | |
4c9483b2 | 269 | fl6.flowi6_proto = IPPROTO_TCP; |
efe4208f | 270 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 271 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 DM |
272 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
273 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
274 | fl6.fl6_dport = usin->sin6_port; |
275 | fl6.fl6_sport = inet->inet_sport; | |
e2d118a1 | 276 | fl6.flowi6_uid = sk->sk_uid; |
1da177e4 | 277 | |
1e1d04e6 | 278 | opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); |
45f6fad8 | 279 | final_p = fl6_update_dst(&fl6, opt, &final); |
1da177e4 | 280 | |
4c9483b2 | 281 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 282 | |
c4e85f73 | 283 | dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); |
68d0c6d3 DM |
284 | if (IS_ERR(dst)) { |
285 | err = PTR_ERR(dst); | |
1da177e4 | 286 | goto failure; |
14e50e57 | 287 | } |
1da177e4 | 288 | |
63159f29 | 289 | if (!saddr) { |
4c9483b2 | 290 | saddr = &fl6.saddr; |
efe4208f | 291 | sk->sk_v6_rcv_saddr = *saddr; |
1da177e4 LT |
292 | } |
293 | ||
294 | /* set the source address */ | |
4e3fd7a0 | 295 | np->saddr = *saddr; |
c720c7e8 | 296 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 297 | |
f83ef8c0 | 298 | sk->sk_gso_type = SKB_GSO_TCPV6; |
6bd4f355 | 299 | ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 300 | |
d83d8461 | 301 | icsk->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
302 | if (opt) |
303 | icsk->icsk_ext_hdr_len = opt->opt_flen + | |
304 | opt->opt_nflen; | |
1da177e4 LT |
305 | |
306 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
307 | ||
c720c7e8 | 308 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
309 | |
310 | tcp_set_state(sk, TCP_SYN_SENT); | |
1946e672 | 311 | err = inet6_hash_connect(tcp_death_row, sk); |
1da177e4 LT |
312 | if (err) |
313 | goto late_failure; | |
314 | ||
877d1f62 | 315 | sk_set_txhash(sk); |
9e7ceb06 | 316 | |
00355fa5 | 317 | if (likely(!tp->repair)) { |
00355fa5 | 318 | if (!tp->write_seq) |
0f317464 ED |
319 | WRITE_ONCE(tp->write_seq, |
320 | secure_tcpv6_seq(np->saddr.s6_addr32, | |
321 | sk->sk_v6_daddr.s6_addr32, | |
322 | inet->inet_sport, | |
323 | inet->inet_dport)); | |
5d2ed052 ED |
324 | tp->tsoffset = secure_tcpv6_ts_off(sock_net(sk), |
325 | np->saddr.s6_addr32, | |
84b114b9 | 326 | sk->sk_v6_daddr.s6_addr32); |
00355fa5 | 327 | } |
1da177e4 | 328 | |
19f6d3f3 WW |
329 | if (tcp_fastopen_defer_connect(sk, &err)) |
330 | return err; | |
331 | if (err) | |
332 | goto late_failure; | |
333 | ||
1da177e4 LT |
334 | err = tcp_connect(sk); |
335 | if (err) | |
336 | goto late_failure; | |
337 | ||
338 | return 0; | |
339 | ||
340 | late_failure: | |
341 | tcp_set_state(sk, TCP_CLOSE); | |
1da177e4 | 342 | failure: |
c720c7e8 | 343 | inet->inet_dport = 0; |
1da177e4 LT |
344 | sk->sk_route_caps = 0; |
345 | return err; | |
346 | } | |
347 | ||
563d34d0 ED |
348 | static void tcp_v6_mtu_reduced(struct sock *sk) |
349 | { | |
350 | struct dst_entry *dst; | |
351 | ||
352 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
353 | return; | |
354 | ||
355 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
356 | if (!dst) | |
357 | return; | |
358 | ||
359 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
360 | tcp_sync_mss(sk, dst_mtu(dst)); | |
361 | tcp_simple_retransmit(sk); | |
362 | } | |
363 | } | |
364 | ||
32bbd879 | 365 | static int tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 366 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 367 | { |
4c99aa40 | 368 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
505cbfc5 | 369 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
2215089b ED |
370 | struct net *net = dev_net(skb->dev); |
371 | struct request_sock *fastopen; | |
1da177e4 | 372 | struct ipv6_pinfo *np; |
1ab1457c | 373 | struct tcp_sock *tp; |
0a672f74 | 374 | __u32 seq, snd_una; |
2215089b | 375 | struct sock *sk; |
9cf74903 | 376 | bool fatal; |
2215089b | 377 | int err; |
1da177e4 | 378 | |
2215089b ED |
379 | sk = __inet6_lookup_established(net, &tcp_hashinfo, |
380 | &hdr->daddr, th->dest, | |
381 | &hdr->saddr, ntohs(th->source), | |
4297a0ef | 382 | skb->dev->ifindex, inet6_sdif(skb)); |
1da177e4 | 383 | |
2215089b | 384 | if (!sk) { |
a16292a0 ED |
385 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
386 | ICMP6_MIB_INERRORS); | |
32bbd879 | 387 | return -ENOENT; |
1da177e4 LT |
388 | } |
389 | ||
390 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 391 | inet_twsk_put(inet_twsk(sk)); |
32bbd879 | 392 | return 0; |
1da177e4 | 393 | } |
2215089b | 394 | seq = ntohl(th->seq); |
9cf74903 | 395 | fatal = icmpv6_err_convert(type, code, &err); |
32bbd879 SB |
396 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
397 | tcp_req_err(sk, seq, fatal); | |
398 | return 0; | |
399 | } | |
1da177e4 LT |
400 | |
401 | bh_lock_sock(sk); | |
563d34d0 | 402 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
02a1d6e7 | 403 | __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
404 | |
405 | if (sk->sk_state == TCP_CLOSE) | |
406 | goto out; | |
407 | ||
93a77c11 | 408 | if (ipv6_hdr(skb)->hop_limit < tcp_inet6_sk(sk)->min_hopcount) { |
02a1d6e7 | 409 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
e802af9c SH |
410 | goto out; |
411 | } | |
412 | ||
1da177e4 | 413 | tp = tcp_sk(sk); |
0a672f74 | 414 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
d983ea6f | 415 | fastopen = rcu_dereference(tp->fastopen_rsk); |
0a672f74 | 416 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; |
1da177e4 | 417 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 418 | !between(seq, snd_una, tp->snd_nxt)) { |
02a1d6e7 | 419 | __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
420 | goto out; |
421 | } | |
422 | ||
93a77c11 | 423 | np = tcp_inet6_sk(sk); |
1da177e4 | 424 | |
ec18d9a2 | 425 | if (type == NDISC_REDIRECT) { |
45caeaa5 JM |
426 | if (!sock_owned_by_user(sk)) { |
427 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
ec18d9a2 | 428 | |
45caeaa5 JM |
429 | if (dst) |
430 | dst->ops->redirect(dst, sk, skb); | |
431 | } | |
50a75a89 | 432 | goto out; |
ec18d9a2 DM |
433 | } |
434 | ||
1da177e4 | 435 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
436 | /* We are not interested in TCP_LISTEN and open_requests |
437 | * (SYN-ACKs send out by Linux are always <576bytes so | |
438 | * they should go through unfragmented). | |
439 | */ | |
440 | if (sk->sk_state == TCP_LISTEN) | |
441 | goto out; | |
442 | ||
93b36cf3 HFS |
443 | if (!ip6_sk_accept_pmtu(sk)) |
444 | goto out; | |
445 | ||
563d34d0 ED |
446 | tp->mtu_info = ntohl(info); |
447 | if (!sock_owned_by_user(sk)) | |
448 | tcp_v6_mtu_reduced(sk); | |
d013ef2a | 449 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
7aa5470c | 450 | &sk->sk_tsq_flags)) |
d013ef2a | 451 | sock_hold(sk); |
1da177e4 LT |
452 | goto out; |
453 | } | |
454 | ||
1da177e4 | 455 | |
60236fdd | 456 | /* Might be for an request_sock */ |
1da177e4 | 457 | switch (sk->sk_state) { |
1da177e4 | 458 | case TCP_SYN_SENT: |
0a672f74 YC |
459 | case TCP_SYN_RECV: |
460 | /* Only in fast or simultaneous open. If a fast open socket is | |
461 | * is already accepted it is treated as a connected one below. | |
462 | */ | |
63159f29 | 463 | if (fastopen && !fastopen->sk) |
0a672f74 YC |
464 | break; |
465 | ||
45af29ca ED |
466 | ipv6_icmp_error(sk, skb, err, th->dest, ntohl(info), (u8 *)th); |
467 | ||
1da177e4 | 468 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
469 | sk->sk_err = err; |
470 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
471 | ||
472 | tcp_done(sk); | |
473 | } else | |
474 | sk->sk_err_soft = err; | |
475 | goto out; | |
d2924569 ED |
476 | case TCP_LISTEN: |
477 | break; | |
478 | default: | |
479 | /* check if this ICMP message allows revert of backoff. | |
480 | * (see RFC 6069) | |
481 | */ | |
482 | if (!fastopen && type == ICMPV6_DEST_UNREACH && | |
483 | code == ICMPV6_NOROUTE) | |
484 | tcp_ld_RTO_revert(sk, seq); | |
1da177e4 LT |
485 | } |
486 | ||
487 | if (!sock_owned_by_user(sk) && np->recverr) { | |
488 | sk->sk_err = err; | |
489 | sk->sk_error_report(sk); | |
490 | } else | |
491 | sk->sk_err_soft = err; | |
492 | ||
493 | out: | |
494 | bh_unlock_sock(sk); | |
495 | sock_put(sk); | |
32bbd879 | 496 | return 0; |
1da177e4 LT |
497 | } |
498 | ||
499 | ||
0f935dbe | 500 | static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst, |
d6274bd8 | 501 | struct flowi *fl, |
3840a06e | 502 | struct request_sock *req, |
ca6fb065 | 503 | struct tcp_fastopen_cookie *foc, |
331fca43 MKL |
504 | enum tcp_synack_type synack_type, |
505 | struct sk_buff *syn_skb) | |
1da177e4 | 506 | { |
634fb979 | 507 | struct inet_request_sock *ireq = inet_rsk(req); |
93a77c11 | 508 | struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
56ac42bc | 509 | struct ipv6_txoptions *opt; |
d6274bd8 | 510 | struct flowi6 *fl6 = &fl->u.ip6; |
4c99aa40 | 511 | struct sk_buff *skb; |
9494218f | 512 | int err = -ENOMEM; |
1da177e4 | 513 | |
9f10d3f6 | 514 | /* First, grab a route. */ |
f76b33c3 ED |
515 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req, |
516 | IPPROTO_TCP)) == NULL) | |
fd80eb94 | 517 | goto done; |
9494218f | 518 | |
331fca43 | 519 | skb = tcp_make_synack(sk, dst, req, foc, synack_type, syn_skb); |
9494218f | 520 | |
1da177e4 | 521 | if (skb) { |
634fb979 ED |
522 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
523 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 524 | |
634fb979 | 525 | fl6->daddr = ireq->ir_v6_rmt_addr; |
53b24b8f | 526 | if (np->repflow && ireq->pktopts) |
df3687ff FF |
527 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); |
528 | ||
3e4006f0 | 529 | rcu_read_lock(); |
56ac42bc HD |
530 | opt = ireq->ipv6_opt; |
531 | if (!opt) | |
532 | opt = rcu_dereference(np->opt); | |
4f6570d7 ED |
533 | err = ip6_xmit(sk, skb, fl6, sk->sk_mark, opt, np->tclass, |
534 | sk->sk_priority); | |
3e4006f0 | 535 | rcu_read_unlock(); |
b9df3cb8 | 536 | err = net_xmit_eval(err); |
1da177e4 LT |
537 | } |
538 | ||
539 | done: | |
1da177e4 LT |
540 | return err; |
541 | } | |
542 | ||
72659ecc | 543 | |
60236fdd | 544 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 545 | { |
56ac42bc | 546 | kfree(inet_rsk(req)->ipv6_opt); |
634fb979 | 547 | kfree_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
548 | } |
549 | ||
cfb6eeb4 | 550 | #ifdef CONFIG_TCP_MD5SIG |
b83e3deb | 551 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk, |
dea53bb8 DA |
552 | const struct in6_addr *addr, |
553 | int l3index) | |
cfb6eeb4 | 554 | { |
dea53bb8 DA |
555 | return tcp_md5_do_lookup(sk, l3index, |
556 | (union tcp_md5_addr *)addr, AF_INET6); | |
cfb6eeb4 YH |
557 | } |
558 | ||
b83e3deb | 559 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk, |
fd3a154a | 560 | const struct sock *addr_sk) |
cfb6eeb4 | 561 | { |
dea53bb8 DA |
562 | int l3index; |
563 | ||
564 | l3index = l3mdev_master_ifindex_by_index(sock_net(sk), | |
565 | addr_sk->sk_bound_dev_if); | |
566 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr, | |
567 | l3index); | |
cfb6eeb4 YH |
568 | } |
569 | ||
8917a777 | 570 | static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, |
d4c19c49 | 571 | sockptr_t optval, int optlen) |
cfb6eeb4 YH |
572 | { |
573 | struct tcp_md5sig cmd; | |
574 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
dea53bb8 | 575 | int l3index = 0; |
8917a777 | 576 | u8 prefixlen; |
cfb6eeb4 YH |
577 | |
578 | if (optlen < sizeof(cmd)) | |
579 | return -EINVAL; | |
580 | ||
d4c19c49 | 581 | if (copy_from_sockptr(&cmd, optval, sizeof(cmd))) |
cfb6eeb4 YH |
582 | return -EFAULT; |
583 | ||
584 | if (sin6->sin6_family != AF_INET6) | |
585 | return -EINVAL; | |
586 | ||
8917a777 ID |
587 | if (optname == TCP_MD5SIG_EXT && |
588 | cmd.tcpm_flags & TCP_MD5SIG_FLAG_PREFIX) { | |
589 | prefixlen = cmd.tcpm_prefixlen; | |
590 | if (prefixlen > 128 || (ipv6_addr_v4mapped(&sin6->sin6_addr) && | |
591 | prefixlen > 32)) | |
592 | return -EINVAL; | |
593 | } else { | |
594 | prefixlen = ipv6_addr_v4mapped(&sin6->sin6_addr) ? 32 : 128; | |
595 | } | |
596 | ||
6b102db5 DA |
597 | if (optname == TCP_MD5SIG_EXT && |
598 | cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX) { | |
599 | struct net_device *dev; | |
600 | ||
601 | rcu_read_lock(); | |
602 | dev = dev_get_by_index_rcu(sock_net(sk), cmd.tcpm_ifindex); | |
603 | if (dev && netif_is_l3_master(dev)) | |
604 | l3index = dev->ifindex; | |
605 | rcu_read_unlock(); | |
606 | ||
607 | /* ok to reference set/not set outside of rcu; | |
608 | * right now device MUST be an L3 master | |
609 | */ | |
610 | if (!dev || !l3index) | |
611 | return -EINVAL; | |
612 | } | |
613 | ||
cfb6eeb4 | 614 | if (!cmd.tcpm_keylen) { |
e773e4fa | 615 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b | 616 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
6b102db5 DA |
617 | AF_INET, prefixlen, |
618 | l3index); | |
a915da9b | 619 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
dea53bb8 | 620 | AF_INET6, prefixlen, l3index); |
cfb6eeb4 YH |
621 | } |
622 | ||
623 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
624 | return -EINVAL; | |
625 | ||
a915da9b ED |
626 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
627 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
dea53bb8 DA |
628 | AF_INET, prefixlen, l3index, |
629 | cmd.tcpm_key, cmd.tcpm_keylen, | |
630 | GFP_KERNEL); | |
cfb6eeb4 | 631 | |
a915da9b | 632 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
dea53bb8 DA |
633 | AF_INET6, prefixlen, l3index, |
634 | cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
635 | } |
636 | ||
19689e38 ED |
637 | static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp, |
638 | const struct in6_addr *daddr, | |
639 | const struct in6_addr *saddr, | |
640 | const struct tcphdr *th, int nbytes) | |
cfb6eeb4 | 641 | { |
cfb6eeb4 | 642 | struct tcp6_pseudohdr *bp; |
49a72dfb | 643 | struct scatterlist sg; |
19689e38 | 644 | struct tcphdr *_th; |
8d26d76d | 645 | |
19689e38 | 646 | bp = hp->scratch; |
cfb6eeb4 | 647 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
648 | bp->saddr = *saddr; |
649 | bp->daddr = *daddr; | |
49a72dfb | 650 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 651 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 652 | |
19689e38 ED |
653 | _th = (struct tcphdr *)(bp + 1); |
654 | memcpy(_th, th, sizeof(*th)); | |
655 | _th->check = 0; | |
656 | ||
657 | sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th)); | |
658 | ahash_request_set_crypt(hp->md5_req, &sg, NULL, | |
659 | sizeof(*bp) + sizeof(*th)); | |
cf80e0e4 | 660 | return crypto_ahash_update(hp->md5_req); |
49a72dfb | 661 | } |
c7da57a1 | 662 | |
19689e38 | 663 | static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, |
b71d1d42 | 664 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 665 | const struct tcphdr *th) |
49a72dfb AL |
666 | { |
667 | struct tcp_md5sig_pool *hp; | |
cf80e0e4 | 668 | struct ahash_request *req; |
49a72dfb AL |
669 | |
670 | hp = tcp_get_md5sig_pool(); | |
671 | if (!hp) | |
672 | goto clear_hash_noput; | |
cf80e0e4 | 673 | req = hp->md5_req; |
49a72dfb | 674 | |
cf80e0e4 | 675 | if (crypto_ahash_init(req)) |
49a72dfb | 676 | goto clear_hash; |
19689e38 | 677 | if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2)) |
49a72dfb AL |
678 | goto clear_hash; |
679 | if (tcp_md5_hash_key(hp, key)) | |
680 | goto clear_hash; | |
cf80e0e4 HX |
681 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
682 | if (crypto_ahash_final(req)) | |
cfb6eeb4 | 683 | goto clear_hash; |
cfb6eeb4 | 684 | |
cfb6eeb4 | 685 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 686 | return 0; |
49a72dfb | 687 | |
cfb6eeb4 YH |
688 | clear_hash: |
689 | tcp_put_md5sig_pool(); | |
690 | clear_hash_noput: | |
691 | memset(md5_hash, 0, 16); | |
49a72dfb | 692 | return 1; |
cfb6eeb4 YH |
693 | } |
694 | ||
39f8e58e ED |
695 | static int tcp_v6_md5_hash_skb(char *md5_hash, |
696 | const struct tcp_md5sig_key *key, | |
318cf7aa | 697 | const struct sock *sk, |
318cf7aa | 698 | const struct sk_buff *skb) |
cfb6eeb4 | 699 | { |
b71d1d42 | 700 | const struct in6_addr *saddr, *daddr; |
49a72dfb | 701 | struct tcp_md5sig_pool *hp; |
cf80e0e4 | 702 | struct ahash_request *req; |
318cf7aa | 703 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 704 | |
39f8e58e ED |
705 | if (sk) { /* valid for establish/request sockets */ |
706 | saddr = &sk->sk_v6_rcv_saddr; | |
efe4208f | 707 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 708 | } else { |
b71d1d42 | 709 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
710 | saddr = &ip6h->saddr; |
711 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 712 | } |
49a72dfb AL |
713 | |
714 | hp = tcp_get_md5sig_pool(); | |
715 | if (!hp) | |
716 | goto clear_hash_noput; | |
cf80e0e4 | 717 | req = hp->md5_req; |
49a72dfb | 718 | |
cf80e0e4 | 719 | if (crypto_ahash_init(req)) |
49a72dfb AL |
720 | goto clear_hash; |
721 | ||
19689e38 | 722 | if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len)) |
49a72dfb AL |
723 | goto clear_hash; |
724 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
725 | goto clear_hash; | |
726 | if (tcp_md5_hash_key(hp, key)) | |
727 | goto clear_hash; | |
cf80e0e4 HX |
728 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
729 | if (crypto_ahash_final(req)) | |
49a72dfb AL |
730 | goto clear_hash; |
731 | ||
732 | tcp_put_md5sig_pool(); | |
733 | return 0; | |
734 | ||
735 | clear_hash: | |
736 | tcp_put_md5sig_pool(); | |
737 | clear_hash_noput: | |
738 | memset(md5_hash, 0, 16); | |
739 | return 1; | |
cfb6eeb4 YH |
740 | } |
741 | ||
ba8e275a ED |
742 | #endif |
743 | ||
744 | static bool tcp_v6_inbound_md5_hash(const struct sock *sk, | |
d14c77e0 DA |
745 | const struct sk_buff *skb, |
746 | int dif, int sdif) | |
cfb6eeb4 | 747 | { |
ba8e275a | 748 | #ifdef CONFIG_TCP_MD5SIG |
cf533ea5 | 749 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 750 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 751 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 752 | const struct tcphdr *th = tcp_hdr(skb); |
dea53bb8 | 753 | int genhash, l3index; |
cfb6eeb4 YH |
754 | u8 newhash[16]; |
755 | ||
dea53bb8 DA |
756 | /* sdif set, means packet ingressed via a device |
757 | * in an L3 domain and dif is set to the l3mdev | |
758 | */ | |
759 | l3index = sdif ? dif : 0; | |
760 | ||
761 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr, l3index); | |
7d5d5525 | 762 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 763 | |
785957d3 DM |
764 | /* We've parsed the options - do we have a hash? */ |
765 | if (!hash_expected && !hash_location) | |
ff74e23f | 766 | return false; |
785957d3 DM |
767 | |
768 | if (hash_expected && !hash_location) { | |
c10d9310 | 769 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
ff74e23f | 770 | return true; |
cfb6eeb4 YH |
771 | } |
772 | ||
785957d3 | 773 | if (!hash_expected && hash_location) { |
c10d9310 | 774 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
ff74e23f | 775 | return true; |
cfb6eeb4 YH |
776 | } |
777 | ||
778 | /* check the signature */ | |
49a72dfb AL |
779 | genhash = tcp_v6_md5_hash_skb(newhash, |
780 | hash_expected, | |
39f8e58e | 781 | NULL, skb); |
49a72dfb | 782 | |
cfb6eeb4 | 783 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
72145a68 | 784 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE); |
dea53bb8 | 785 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u L3 index %d\n", |
e87cc472 JP |
786 | genhash ? "failed" : "mismatch", |
787 | &ip6h->saddr, ntohs(th->source), | |
dea53bb8 | 788 | &ip6h->daddr, ntohs(th->dest), l3index); |
ff74e23f | 789 | return true; |
cfb6eeb4 | 790 | } |
ba8e275a | 791 | #endif |
ff74e23f | 792 | return false; |
cfb6eeb4 | 793 | } |
cfb6eeb4 | 794 | |
b40cf18e ED |
795 | static void tcp_v6_init_req(struct request_sock *req, |
796 | const struct sock *sk_listener, | |
16bea70a OP |
797 | struct sk_buff *skb) |
798 | { | |
c2027d1e | 799 | bool l3_slave = ipv6_l3mdev_skb(TCP_SKB_CB(skb)->header.h6.flags); |
16bea70a | 800 | struct inet_request_sock *ireq = inet_rsk(req); |
93a77c11 | 801 | const struct ipv6_pinfo *np = tcp_inet6_sk(sk_listener); |
16bea70a OP |
802 | |
803 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
804 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
805 | ||
16bea70a | 806 | /* So that link locals have meaning */ |
c2027d1e | 807 | if ((!sk_listener->sk_bound_dev_if || l3_slave) && |
16bea70a | 808 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
870c3151 | 809 | ireq->ir_iif = tcp_v6_iif(skb); |
16bea70a | 810 | |
04317daf | 811 | if (!TCP_SKB_CB(skb)->tcp_tw_isn && |
b40cf18e | 812 | (ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) || |
a224772d | 813 | np->rxopt.bits.rxinfo || |
16bea70a OP |
814 | np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim || |
815 | np->rxopt.bits.rxohlim || np->repflow)) { | |
63354797 | 816 | refcount_inc(&skb->users); |
16bea70a OP |
817 | ireq->pktopts = skb; |
818 | } | |
819 | } | |
820 | ||
f964629e ED |
821 | static struct dst_entry *tcp_v6_route_req(const struct sock *sk, |
822 | struct flowi *fl, | |
4396e461 | 823 | const struct request_sock *req) |
d94e0417 | 824 | { |
f76b33c3 | 825 | return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP); |
d94e0417 OP |
826 | } |
827 | ||
c6aefafb | 828 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 829 | .family = AF_INET6, |
2e6599cb | 830 | .obj_size = sizeof(struct tcp6_request_sock), |
5db92c99 | 831 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
832 | .send_ack = tcp_v6_reqsk_send_ack, |
833 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 834 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 835 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
836 | }; |
837 | ||
35b2c321 | 838 | const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
2aec4a29 OP |
839 | .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - |
840 | sizeof(struct ipv6hdr), | |
16bea70a | 841 | #ifdef CONFIG_TCP_MD5SIG |
fd3a154a | 842 | .req_md5_lookup = tcp_v6_md5_lookup, |
e3afe7b7 | 843 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
b6332e6c | 844 | #endif |
16bea70a | 845 | .init_req = tcp_v6_init_req, |
fb7b37a7 OP |
846 | #ifdef CONFIG_SYN_COOKIES |
847 | .cookie_init_seq = cookie_v6_init_sequence, | |
848 | #endif | |
d94e0417 | 849 | .route_req = tcp_v6_route_req, |
84b114b9 ED |
850 | .init_seq = tcp_v6_init_seq, |
851 | .init_ts_off = tcp_v6_init_ts_off, | |
d6274bd8 | 852 | .send_synack = tcp_v6_send_synack, |
16bea70a | 853 | }; |
cfb6eeb4 | 854 | |
a00e7444 | 855 | static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae ED |
856 | u32 ack, u32 win, u32 tsval, u32 tsecr, |
857 | int oif, struct tcp_md5sig_key *key, int rst, | |
e9a5dcee | 858 | u8 tclass, __be32 label, u32 priority) |
1da177e4 | 859 | { |
cf533ea5 ED |
860 | const struct tcphdr *th = tcp_hdr(skb); |
861 | struct tcphdr *t1; | |
1da177e4 | 862 | struct sk_buff *buff; |
4c9483b2 | 863 | struct flowi6 fl6; |
0f85feae | 864 | struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
e5047992 | 865 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 866 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 867 | struct dst_entry *dst; |
81ada62d | 868 | __be32 *topt; |
00483690 | 869 | __u32 mark = 0; |
1da177e4 | 870 | |
ee684b6f | 871 | if (tsecr) |
626e264d | 872 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 873 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
874 | if (key) |
875 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
876 | #endif | |
877 | ||
cfb6eeb4 | 878 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 879 | GFP_ATOMIC); |
63159f29 | 880 | if (!buff) |
1ab1457c | 881 | return; |
1da177e4 | 882 | |
cfb6eeb4 | 883 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 884 | |
d58ff351 | 885 | t1 = skb_push(buff, tot_len); |
6651ffc8 | 886 | skb_reset_transport_header(buff); |
1da177e4 LT |
887 | |
888 | /* Swap the send and the receive. */ | |
889 | memset(t1, 0, sizeof(*t1)); | |
890 | t1->dest = th->source; | |
891 | t1->source = th->dest; | |
cfb6eeb4 | 892 | t1->doff = tot_len / 4; |
626e264d IJ |
893 | t1->seq = htonl(seq); |
894 | t1->ack_seq = htonl(ack); | |
895 | t1->ack = !rst || !th->ack; | |
896 | t1->rst = rst; | |
897 | t1->window = htons(win); | |
1da177e4 | 898 | |
81ada62d IJ |
899 | topt = (__be32 *)(t1 + 1); |
900 | ||
ee684b6f | 901 | if (tsecr) { |
626e264d IJ |
902 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
903 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
904 | *topt++ = htonl(tsval); |
905 | *topt++ = htonl(tsecr); | |
626e264d IJ |
906 | } |
907 | ||
cfb6eeb4 YH |
908 | #ifdef CONFIG_TCP_MD5SIG |
909 | if (key) { | |
81ada62d IJ |
910 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
911 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
912 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
913 | &ipv6_hdr(skb)->saddr, |
914 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
915 | } |
916 | #endif | |
917 | ||
4c9483b2 | 918 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
919 | fl6.daddr = ipv6_hdr(skb)->saddr; |
920 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 921 | fl6.flowlabel = label; |
1da177e4 | 922 | |
e5700aff DM |
923 | buff->ip_summed = CHECKSUM_PARTIAL; |
924 | buff->csum = 0; | |
925 | ||
4c9483b2 | 926 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 927 | |
4c9483b2 | 928 | fl6.flowi6_proto = IPPROTO_TCP; |
a36dbdb2 | 929 | if (rt6_need_strict(&fl6.daddr) && !oif) |
870c3151 | 930 | fl6.flowi6_oif = tcp_v6_iif(skb); |
9b6c14d5 DA |
931 | else { |
932 | if (!oif && netif_index_is_l3_master(net, skb->skb_iif)) | |
933 | oif = skb->skb_iif; | |
934 | ||
935 | fl6.flowi6_oif = oif; | |
936 | } | |
1d2f7b2d | 937 | |
c67b8555 ED |
938 | if (sk) { |
939 | if (sk->sk_state == TCP_TIME_WAIT) { | |
940 | mark = inet_twsk(sk)->tw_mark; | |
941 | /* autoflowlabel relies on buff->hash */ | |
942 | skb_set_hash(buff, inet_twsk(sk)->tw_txhash, | |
943 | PKT_HASH_TYPE_L4); | |
944 | } else { | |
945 | mark = sk->sk_mark; | |
946 | } | |
d6fb396c | 947 | buff->tstamp = tcp_transmit_time(sk); |
c67b8555 | 948 | } |
00483690 | 949 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark) ?: mark; |
1958b856 DM |
950 | fl6.fl6_dport = t1->dest; |
951 | fl6.fl6_sport = t1->source; | |
e2d118a1 | 952 | fl6.flowi6_uid = sock_net_uid(net, sk && sk_fullsock(sk) ? sk : NULL); |
4c9483b2 | 953 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 954 | |
c20121ae DL |
955 | /* Pass a socket to ip6_dst_lookup either it is for RST |
956 | * Underlying function will use this to retrieve the network | |
957 | * namespace | |
958 | */ | |
c4e85f73 | 959 | dst = ip6_dst_lookup_flow(sock_net(ctl_sk), ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
960 | if (!IS_ERR(dst)) { |
961 | skb_dst_set(buff, dst); | |
4f6570d7 | 962 | ip6_xmit(ctl_sk, buff, &fl6, fl6.flowi6_mark, NULL, tclass, |
e9a5dcee | 963 | priority); |
c10d9310 | 964 | TCP_INC_STATS(net, TCP_MIB_OUTSEGS); |
68d0c6d3 | 965 | if (rst) |
c10d9310 | 966 | TCP_INC_STATS(net, TCP_MIB_OUTRSTS); |
68d0c6d3 | 967 | return; |
1da177e4 LT |
968 | } |
969 | ||
970 | kfree_skb(buff); | |
971 | } | |
972 | ||
a00e7444 | 973 | static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) |
1da177e4 | 974 | { |
cf533ea5 | 975 | const struct tcphdr *th = tcp_hdr(skb); |
323a53c4 | 976 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
626e264d | 977 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 978 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
979 | #ifdef CONFIG_TCP_MD5SIG |
980 | const __u8 *hash_location = NULL; | |
658ddaaf SL |
981 | unsigned char newhash[16]; |
982 | int genhash; | |
983 | struct sock *sk1 = NULL; | |
984 | #endif | |
323a53c4 | 985 | __be32 label = 0; |
e9a5dcee | 986 | u32 priority = 0; |
323a53c4 | 987 | struct net *net; |
c24b14c4 | 988 | int oif = 0; |
1da177e4 | 989 | |
626e264d | 990 | if (th->rst) |
1da177e4 LT |
991 | return; |
992 | ||
c3658e8d ED |
993 | /* If sk not NULL, it means we did a successful lookup and incoming |
994 | * route had to be correct. prequeue might have dropped our dst. | |
995 | */ | |
996 | if (!sk && !ipv6_unicast_destination(skb)) | |
626e264d | 997 | return; |
1da177e4 | 998 | |
39209673 | 999 | net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
cfb6eeb4 | 1000 | #ifdef CONFIG_TCP_MD5SIG |
3b24d854 | 1001 | rcu_read_lock(); |
658ddaaf | 1002 | hash_location = tcp_parse_md5sig_option(th); |
271c3b9b | 1003 | if (sk && sk_fullsock(sk)) { |
dea53bb8 DA |
1004 | int l3index; |
1005 | ||
1006 | /* sdif set, means packet ingressed via a device | |
1007 | * in an L3 domain and inet_iif is set to it. | |
1008 | */ | |
1009 | l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0; | |
1010 | key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr, l3index); | |
e46787f0 | 1011 | } else if (hash_location) { |
d14c77e0 DA |
1012 | int dif = tcp_v6_iif_l3_slave(skb); |
1013 | int sdif = tcp_v6_sdif(skb); | |
dea53bb8 | 1014 | int l3index; |
d14c77e0 | 1015 | |
658ddaaf SL |
1016 | /* |
1017 | * active side is lost. Try to find listening socket through | |
1018 | * source port, and then find md5 key through listening socket. | |
1019 | * we are not loose security here: | |
1020 | * Incoming packet is checked with md5 hash with finding key, | |
1021 | * no RST generated if md5 hash doesn't match. | |
1022 | */ | |
323a53c4 | 1023 | sk1 = inet6_lookup_listener(net, |
a583636a CG |
1024 | &tcp_hashinfo, NULL, 0, |
1025 | &ipv6h->saddr, | |
5ba24953 | 1026 | th->source, &ipv6h->daddr, |
d14c77e0 | 1027 | ntohs(th->source), dif, sdif); |
658ddaaf | 1028 | if (!sk1) |
3b24d854 | 1029 | goto out; |
658ddaaf | 1030 | |
dea53bb8 DA |
1031 | /* sdif set, means packet ingressed via a device |
1032 | * in an L3 domain and dif is set to it. | |
1033 | */ | |
1034 | l3index = tcp_v6_sdif(skb) ? dif : 0; | |
1035 | ||
1036 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr, l3index); | |
658ddaaf | 1037 | if (!key) |
3b24d854 | 1038 | goto out; |
658ddaaf | 1039 | |
39f8e58e | 1040 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb); |
658ddaaf | 1041 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
3b24d854 | 1042 | goto out; |
658ddaaf | 1043 | } |
cfb6eeb4 YH |
1044 | #endif |
1045 | ||
626e264d IJ |
1046 | if (th->ack) |
1047 | seq = ntohl(th->ack_seq); | |
1048 | else | |
1049 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
1050 | (th->doff << 2); | |
1da177e4 | 1051 | |
c24b14c4 SL |
1052 | if (sk) { |
1053 | oif = sk->sk_bound_dev_if; | |
052e0690 ED |
1054 | if (sk_fullsock(sk)) { |
1055 | const struct ipv6_pinfo *np = tcp_inet6_sk(sk); | |
1056 | ||
5c487bb9 | 1057 | trace_tcp_send_reset(sk, skb); |
052e0690 ED |
1058 | if (np->repflow) |
1059 | label = ip6_flowlabel(ipv6h); | |
e9a5dcee | 1060 | priority = sk->sk_priority; |
052e0690 | 1061 | } |
f6c0f5d2 | 1062 | if (sk->sk_state == TCP_TIME_WAIT) { |
50a8accf | 1063 | label = cpu_to_be32(inet_twsk(sk)->tw_flowlabel); |
f6c0f5d2 ED |
1064 | priority = inet_twsk(sk)->tw_priority; |
1065 | } | |
323a53c4 | 1066 | } else { |
a346abe0 | 1067 | if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_TCP_RESET) |
323a53c4 | 1068 | label = ip6_flowlabel(ipv6h); |
c24b14c4 SL |
1069 | } |
1070 | ||
323a53c4 | 1071 | tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, |
e9a5dcee | 1072 | label, priority); |
658ddaaf SL |
1073 | |
1074 | #ifdef CONFIG_TCP_MD5SIG | |
3b24d854 ED |
1075 | out: |
1076 | rcu_read_unlock(); | |
658ddaaf | 1077 | #endif |
626e264d | 1078 | } |
1da177e4 | 1079 | |
a00e7444 | 1080 | static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae | 1081 | u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, |
1d13a96c | 1082 | struct tcp_md5sig_key *key, u8 tclass, |
e9a5dcee | 1083 | __be32 label, u32 priority) |
626e264d | 1084 | { |
0f85feae | 1085 | tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0, |
e9a5dcee | 1086 | tclass, label, priority); |
1da177e4 LT |
1087 | } |
1088 | ||
1089 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1090 | { | |
8feaf0c0 | 1091 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 1092 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 1093 | |
0f85feae | 1094 | tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 1095 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
9a568de4 | 1096 | tcp_time_stamp_raw() + tcptw->tw_ts_offset, |
9c76a114 | 1097 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
f6c0f5d2 | 1098 | tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel), tw->tw_priority); |
1da177e4 | 1099 | |
8feaf0c0 | 1100 | inet_twsk_put(tw); |
1da177e4 LT |
1101 | } |
1102 | ||
a00e7444 | 1103 | static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, |
6edafaaf | 1104 | struct request_sock *req) |
1da177e4 | 1105 | { |
dea53bb8 DA |
1106 | int l3index; |
1107 | ||
1108 | l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0; | |
1109 | ||
3a19ce0e DL |
1110 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
1111 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
1112 | */ | |
20a2b49f ED |
1113 | /* RFC 7323 2.3 |
1114 | * The window field (SEG.WND) of every outgoing segment, with the | |
1115 | * exception of <SYN> segments, MUST be right-shifted by | |
1116 | * Rcv.Wind.Shift bits: | |
1117 | */ | |
0f85feae | 1118 | tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ? |
3a19ce0e | 1119 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
20a2b49f ED |
1120 | tcp_rsk(req)->rcv_nxt, |
1121 | req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale, | |
9a568de4 | 1122 | tcp_time_stamp_raw() + tcp_rsk(req)->ts_off, |
95a22cae | 1123 | req->ts_recent, sk->sk_bound_dev_if, |
dea53bb8 | 1124 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr, l3index), |
e9a5dcee | 1125 | 0, 0, sk->sk_priority); |
1da177e4 LT |
1126 | } |
1127 | ||
1128 | ||
079096f1 | 1129 | static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1130 | { |
079096f1 | 1131 | #ifdef CONFIG_SYN_COOKIES |
aa8223c7 | 1132 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 1133 | |
af9b4738 | 1134 | if (!th->syn) |
c6aefafb | 1135 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1136 | #endif |
1137 | return sk; | |
1138 | } | |
1139 | ||
9349d600 PP |
1140 | u16 tcp_v6_get_syncookie(struct sock *sk, struct ipv6hdr *iph, |
1141 | struct tcphdr *th, u32 *cookie) | |
1142 | { | |
1143 | u16 mss = 0; | |
1144 | #ifdef CONFIG_SYN_COOKIES | |
1145 | mss = tcp_get_syncookie_mss(&tcp6_request_sock_ops, | |
1146 | &tcp_request_sock_ipv6_ops, sk, th); | |
1147 | if (mss) { | |
1148 | *cookie = __cookie_v6_init_sequence(iph, th, &mss); | |
1149 | tcp_synq_overflow(sk); | |
1150 | } | |
1151 | #endif | |
1152 | return mss; | |
1153 | } | |
1154 | ||
1da177e4 LT |
1155 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
1156 | { | |
1da177e4 LT |
1157 | if (skb->protocol == htons(ETH_P_IP)) |
1158 | return tcp_v4_conn_request(sk, skb); | |
1159 | ||
1160 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1161 | goto drop; |
1da177e4 | 1162 | |
1fb6f159 OP |
1163 | return tcp_conn_request(&tcp6_request_sock_ops, |
1164 | &tcp_request_sock_ipv6_ops, sk, skb); | |
1da177e4 LT |
1165 | |
1166 | drop: | |
9caad864 | 1167 | tcp_listendrop(sk); |
1da177e4 LT |
1168 | return 0; /* don't send reset */ |
1169 | } | |
1170 | ||
ebf6c9cb ED |
1171 | static void tcp_v6_restore_cb(struct sk_buff *skb) |
1172 | { | |
1173 | /* We need to move header back to the beginning if xfrm6_policy_check() | |
1174 | * and tcp_v6_fill_cb() are going to be called again. | |
1175 | * ip6_datagram_recv_specific_ctl() also expects IP6CB to be there. | |
1176 | */ | |
1177 | memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6, | |
1178 | sizeof(struct inet6_skb_parm)); | |
1179 | } | |
1180 | ||
0c27171e | 1181 | static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, |
4c99aa40 | 1182 | struct request_sock *req, |
5e0724d0 ED |
1183 | struct dst_entry *dst, |
1184 | struct request_sock *req_unhash, | |
1185 | bool *own_req) | |
1da177e4 | 1186 | { |
634fb979 | 1187 | struct inet_request_sock *ireq; |
0c27171e | 1188 | struct ipv6_pinfo *newnp; |
93a77c11 | 1189 | const struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
45f6fad8 | 1190 | struct ipv6_txoptions *opt; |
1da177e4 LT |
1191 | struct inet_sock *newinet; |
1192 | struct tcp_sock *newtp; | |
1193 | struct sock *newsk; | |
cfb6eeb4 YH |
1194 | #ifdef CONFIG_TCP_MD5SIG |
1195 | struct tcp_md5sig_key *key; | |
dea53bb8 | 1196 | int l3index; |
cfb6eeb4 | 1197 | #endif |
3840a06e | 1198 | struct flowi6 fl6; |
1da177e4 LT |
1199 | |
1200 | if (skb->protocol == htons(ETH_P_IP)) { | |
1201 | /* | |
1202 | * v6 mapped | |
1203 | */ | |
1204 | ||
5e0724d0 ED |
1205 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst, |
1206 | req_unhash, own_req); | |
1da177e4 | 1207 | |
63159f29 | 1208 | if (!newsk) |
1da177e4 LT |
1209 | return NULL; |
1210 | ||
93a77c11 | 1211 | inet_sk(newsk)->pinet6 = tcp_inet6_sk(newsk); |
1da177e4 LT |
1212 | |
1213 | newinet = inet_sk(newsk); | |
93a77c11 | 1214 | newnp = tcp_inet6_sk(newsk); |
1da177e4 LT |
1215 | newtp = tcp_sk(newsk); |
1216 | ||
1217 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1218 | ||
d1e559d0 | 1219 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
1da177e4 | 1220 | |
8292a17a | 1221 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
cec37a6e | 1222 | if (sk_is_mptcp(newsk)) |
31484d56 | 1223 | mptcpv6_handle_mapped(newsk, true); |
1da177e4 | 1224 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1225 | #ifdef CONFIG_TCP_MD5SIG |
1226 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1227 | #endif | |
1228 | ||
83eaddab | 1229 | newnp->ipv6_mc_list = NULL; |
676a1184 YZ |
1230 | newnp->ipv6_ac_list = NULL; |
1231 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1232 | newnp->pktoptions = NULL; |
1233 | newnp->opt = NULL; | |
89e41309 ED |
1234 | newnp->mcast_oif = inet_iif(skb); |
1235 | newnp->mcast_hops = ip_hdr(skb)->ttl; | |
1236 | newnp->rcv_flowinfo = 0; | |
df3687ff | 1237 | if (np->repflow) |
89e41309 | 1238 | newnp->flow_label = 0; |
1da177e4 | 1239 | |
e6848976 ACM |
1240 | /* |
1241 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1242 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1243 | * that function for the gory details. -acme | |
1da177e4 | 1244 | */ |
1da177e4 LT |
1245 | |
1246 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1247 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1248 | Sync it now. |
1249 | */ | |
d83d8461 | 1250 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1251 | |
1252 | return newsk; | |
1253 | } | |
1254 | ||
634fb979 | 1255 | ireq = inet_rsk(req); |
1da177e4 LT |
1256 | |
1257 | if (sk_acceptq_is_full(sk)) | |
1258 | goto out_overflow; | |
1259 | ||
493f377d | 1260 | if (!dst) { |
f76b33c3 | 1261 | dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_TCP); |
493f377d | 1262 | if (!dst) |
1da177e4 | 1263 | goto out; |
1ab1457c | 1264 | } |
1da177e4 LT |
1265 | |
1266 | newsk = tcp_create_openreq_child(sk, req, skb); | |
63159f29 | 1267 | if (!newsk) |
093d2823 | 1268 | goto out_nonewsk; |
1da177e4 | 1269 | |
e6848976 ACM |
1270 | /* |
1271 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1272 | * count here, tcp_create_openreq_child now does this for us, see the | |
1273 | * comment in that function for the gory details. -acme | |
1274 | */ | |
1da177e4 | 1275 | |
59eed279 | 1276 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
6bd4f355 | 1277 | ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1278 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 | 1279 | |
93a77c11 | 1280 | inet_sk(newsk)->pinet6 = tcp_inet6_sk(newsk); |
1da177e4 LT |
1281 | |
1282 | newtp = tcp_sk(newsk); | |
1283 | newinet = inet_sk(newsk); | |
93a77c11 | 1284 | newnp = tcp_inet6_sk(newsk); |
1da177e4 LT |
1285 | |
1286 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1287 | ||
634fb979 ED |
1288 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1289 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1290 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1291 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1292 | |
1ab1457c | 1293 | /* Now IPv6 options... |
1da177e4 LT |
1294 | |
1295 | First: no IPv4 options. | |
1296 | */ | |
f6d8bd05 | 1297 | newinet->inet_opt = NULL; |
83eaddab | 1298 | newnp->ipv6_mc_list = NULL; |
676a1184 | 1299 | newnp->ipv6_ac_list = NULL; |
d35690be | 1300 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1301 | |
1302 | /* Clone RX bits */ | |
1303 | newnp->rxopt.all = np->rxopt.all; | |
1304 | ||
1da177e4 | 1305 | newnp->pktoptions = NULL; |
1da177e4 | 1306 | newnp->opt = NULL; |
870c3151 | 1307 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1308 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1309 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1310 | if (np->repflow) |
1311 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 LT |
1312 | |
1313 | /* Clone native IPv6 options from listening socket (if any) | |
1314 | ||
1315 | Yes, keeping reference count would be much more clever, | |
1316 | but we make one more one thing there: reattach optmem | |
1317 | to newsk. | |
1318 | */ | |
56ac42bc HD |
1319 | opt = ireq->ipv6_opt; |
1320 | if (!opt) | |
1321 | opt = rcu_dereference(np->opt); | |
45f6fad8 ED |
1322 | if (opt) { |
1323 | opt = ipv6_dup_options(newsk, opt); | |
1324 | RCU_INIT_POINTER(newnp->opt, opt); | |
1325 | } | |
d83d8461 | 1326 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
1327 | if (opt) |
1328 | inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen + | |
1329 | opt->opt_flen; | |
1da177e4 | 1330 | |
81164413 DB |
1331 | tcp_ca_openreq_child(newsk, dst); |
1332 | ||
1da177e4 | 1333 | tcp_sync_mss(newsk, dst_mtu(dst)); |
3541f9e8 | 1334 | newtp->advmss = tcp_mss_clamp(tcp_sk(sk), dst_metric_advmss(dst)); |
d135c522 | 1335 | |
1da177e4 LT |
1336 | tcp_initialize_rcv_mss(newsk); |
1337 | ||
c720c7e8 ED |
1338 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1339 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1340 | |
cfb6eeb4 | 1341 | #ifdef CONFIG_TCP_MD5SIG |
dea53bb8 DA |
1342 | l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif); |
1343 | ||
cfb6eeb4 | 1344 | /* Copy over the MD5 key from the original socket */ |
dea53bb8 | 1345 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr, l3index); |
53b24b8f | 1346 | if (key) { |
cfb6eeb4 YH |
1347 | /* We're using one, so create a matching key |
1348 | * on the newsk structure. If we fail to get | |
1349 | * memory, then we end up not copying the key | |
1350 | * across. Shucks. | |
1351 | */ | |
efe4208f | 1352 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
dea53bb8 | 1353 | AF_INET6, 128, l3index, key->key, key->keylen, |
7450aaf6 | 1354 | sk_gfp_mask(sk, GFP_ATOMIC)); |
cfb6eeb4 YH |
1355 | } |
1356 | #endif | |
1357 | ||
093d2823 | 1358 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1359 | inet_csk_prepare_forced_close(newsk); |
1360 | tcp_done(newsk); | |
093d2823 BS |
1361 | goto out; |
1362 | } | |
5e0724d0 | 1363 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); |
805c4bc0 | 1364 | if (*own_req) { |
49a496c9 | 1365 | tcp_move_syn(newtp, req); |
805c4bc0 ED |
1366 | |
1367 | /* Clone pktoptions received with SYN, if we own the req */ | |
1368 | if (ireq->pktopts) { | |
1369 | newnp->pktoptions = skb_clone(ireq->pktopts, | |
7450aaf6 | 1370 | sk_gfp_mask(sk, GFP_ATOMIC)); |
805c4bc0 ED |
1371 | consume_skb(ireq->pktopts); |
1372 | ireq->pktopts = NULL; | |
ebf6c9cb ED |
1373 | if (newnp->pktoptions) { |
1374 | tcp_v6_restore_cb(newnp->pktoptions); | |
805c4bc0 | 1375 | skb_set_owner_r(newnp->pktoptions, newsk); |
ebf6c9cb | 1376 | } |
805c4bc0 | 1377 | } |
ce105008 | 1378 | } |
1da177e4 LT |
1379 | |
1380 | return newsk; | |
1381 | ||
1382 | out_overflow: | |
02a1d6e7 | 1383 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1384 | out_nonewsk: |
1da177e4 | 1385 | dst_release(dst); |
093d2823 | 1386 | out: |
9caad864 | 1387 | tcp_listendrop(sk); |
1da177e4 LT |
1388 | return NULL; |
1389 | } | |
1390 | ||
1da177e4 | 1391 | /* The socket must have it's spinlock held when we get |
e994b2f0 | 1392 | * here, unless it is a TCP_LISTEN socket. |
1da177e4 LT |
1393 | * |
1394 | * We have a potential double-lock case here, so even when | |
1395 | * doing backlog processing we use the BH locking scheme. | |
1396 | * This is because we cannot sleep with the original spinlock | |
1397 | * held. | |
1398 | */ | |
1399 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1400 | { | |
93a77c11 | 1401 | struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
1da177e4 | 1402 | struct sk_buff *opt_skb = NULL; |
93a77c11 | 1403 | struct tcp_sock *tp; |
1da177e4 LT |
1404 | |
1405 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1406 | goes to IPv4 receive handler and backlogged. | |
1407 | From backlog it always goes here. Kerboom... | |
1408 | Fortunately, tcp_rcv_established and rcv_established | |
1409 | handle them correctly, but it is not case with | |
1410 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1411 | */ | |
1412 | ||
1413 | if (skb->protocol == htons(ETH_P_IP)) | |
1414 | return tcp_v4_do_rcv(sk, skb); | |
1415 | ||
1da177e4 LT |
1416 | /* |
1417 | * socket locking is here for SMP purposes as backlog rcv | |
1418 | * is currently called with bh processing disabled. | |
1419 | */ | |
1420 | ||
1421 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1422 | ||
1423 | Yes, guys, it is the only place in our code, where we | |
1424 | may make it not affecting IPv4. | |
1425 | The rest of code is protocol independent, | |
1426 | and I do not like idea to uglify IPv4. | |
1427 | ||
1428 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1429 | looks not very well thought. For now we latch | |
1430 | options, received in the last packet, enqueued | |
1431 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1432 | --ANK (980728) |
1da177e4 LT |
1433 | */ |
1434 | if (np->rxopt.all) | |
7450aaf6 | 1435 | opt_skb = skb_clone(skb, sk_gfp_mask(sk, GFP_ATOMIC)); |
1da177e4 LT |
1436 | |
1437 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1438 | struct dst_entry *dst = sk->sk_rx_dst; |
1439 | ||
bdeab991 | 1440 | sock_rps_save_rxhash(sk, skb); |
3d97379a | 1441 | sk_mark_napi_id(sk, skb); |
5d299f3d ED |
1442 | if (dst) { |
1443 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1444 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1445 | dst_release(dst); | |
1446 | sk->sk_rx_dst = NULL; | |
1447 | } | |
1448 | } | |
1449 | ||
3d97d88e | 1450 | tcp_rcv_established(sk, skb); |
1da177e4 LT |
1451 | if (opt_skb) |
1452 | goto ipv6_pktoptions; | |
1453 | return 0; | |
1454 | } | |
1455 | ||
12e25e10 | 1456 | if (tcp_checksum_complete(skb)) |
1da177e4 LT |
1457 | goto csum_err; |
1458 | ||
1ab1457c | 1459 | if (sk->sk_state == TCP_LISTEN) { |
079096f1 ED |
1460 | struct sock *nsk = tcp_v6_cookie_check(sk, skb); |
1461 | ||
1da177e4 LT |
1462 | if (!nsk) |
1463 | goto discard; | |
1464 | ||
4c99aa40 | 1465 | if (nsk != sk) { |
1da177e4 LT |
1466 | if (tcp_child_process(sk, nsk, skb)) |
1467 | goto reset; | |
1468 | if (opt_skb) | |
1469 | __kfree_skb(opt_skb); | |
1470 | return 0; | |
1471 | } | |
47482f13 | 1472 | } else |
bdeab991 | 1473 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1474 | |
72ab4a86 | 1475 | if (tcp_rcv_state_process(sk, skb)) |
1da177e4 | 1476 | goto reset; |
1da177e4 LT |
1477 | if (opt_skb) |
1478 | goto ipv6_pktoptions; | |
1479 | return 0; | |
1480 | ||
1481 | reset: | |
cfb6eeb4 | 1482 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1483 | discard: |
1484 | if (opt_skb) | |
1485 | __kfree_skb(opt_skb); | |
1486 | kfree_skb(skb); | |
1487 | return 0; | |
1488 | csum_err: | |
c10d9310 ED |
1489 | TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS); |
1490 | TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS); | |
1da177e4 LT |
1491 | goto discard; |
1492 | ||
1493 | ||
1494 | ipv6_pktoptions: | |
1495 | /* Do you ask, what is it? | |
1496 | ||
1497 | 1. skb was enqueued by tcp. | |
1498 | 2. skb is added to tail of read queue, rather than out of order. | |
1499 | 3. socket is not in passive state. | |
1500 | 4. Finally, it really contains options, which user wants to receive. | |
1501 | */ | |
1502 | tp = tcp_sk(sk); | |
1503 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1504 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1505 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
870c3151 | 1506 | np->mcast_oif = tcp_v6_iif(opt_skb); |
333fad53 | 1507 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1508 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
82e9f105 | 1509 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1510 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
df3687ff FF |
1511 | if (np->repflow) |
1512 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
a224772d | 1513 | if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) { |
1da177e4 | 1514 | skb_set_owner_r(opt_skb, sk); |
8ce48623 | 1515 | tcp_v6_restore_cb(opt_skb); |
1da177e4 LT |
1516 | opt_skb = xchg(&np->pktoptions, opt_skb); |
1517 | } else { | |
1518 | __kfree_skb(opt_skb); | |
1519 | opt_skb = xchg(&np->pktoptions, NULL); | |
1520 | } | |
1521 | } | |
1522 | ||
800d55f1 | 1523 | kfree_skb(opt_skb); |
1da177e4 LT |
1524 | return 0; |
1525 | } | |
1526 | ||
2dc49d16 ND |
1527 | static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr, |
1528 | const struct tcphdr *th) | |
1529 | { | |
1530 | /* This is tricky: we move IP6CB at its correct location into | |
1531 | * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because | |
1532 | * _decode_session6() uses IP6CB(). | |
1533 | * barrier() makes sure compiler won't play aliasing games. | |
1534 | */ | |
1535 | memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb), | |
1536 | sizeof(struct inet6_skb_parm)); | |
1537 | barrier(); | |
1538 | ||
1539 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1540 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1541 | skb->len - th->doff*4); | |
1542 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1543 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); | |
1544 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; | |
1545 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); | |
1546 | TCP_SKB_CB(skb)->sacked = 0; | |
98aaa913 MM |
1547 | TCP_SKB_CB(skb)->has_rxtstamp = |
1548 | skb->tstamp || skb_hwtstamps(skb)->hwtstamp; | |
2dc49d16 ND |
1549 | } |
1550 | ||
0e219ae4 | 1551 | INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1552 | { |
8b27dae5 | 1553 | struct sk_buff *skb_to_free; |
4297a0ef | 1554 | int sdif = inet6_sdif(skb); |
d14c77e0 | 1555 | int dif = inet6_iif(skb); |
cf533ea5 | 1556 | const struct tcphdr *th; |
b71d1d42 | 1557 | const struct ipv6hdr *hdr; |
3b24d854 | 1558 | bool refcounted; |
1da177e4 LT |
1559 | struct sock *sk; |
1560 | int ret; | |
a86b1e30 | 1561 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1562 | |
1563 | if (skb->pkt_type != PACKET_HOST) | |
1564 | goto discard_it; | |
1565 | ||
1566 | /* | |
1567 | * Count it even if it's bad. | |
1568 | */ | |
90bbcc60 | 1569 | __TCP_INC_STATS(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1570 | |
1571 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1572 | goto discard_it; | |
1573 | ||
ea1627c2 | 1574 | th = (const struct tcphdr *)skb->data; |
1da177e4 | 1575 | |
ea1627c2 | 1576 | if (unlikely(th->doff < sizeof(struct tcphdr)/4)) |
1da177e4 LT |
1577 | goto bad_packet; |
1578 | if (!pskb_may_pull(skb, th->doff*4)) | |
1579 | goto discard_it; | |
1580 | ||
e4f45b7f | 1581 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
6a5dc9e5 | 1582 | goto csum_error; |
1da177e4 | 1583 | |
ea1627c2 | 1584 | th = (const struct tcphdr *)skb->data; |
e802af9c | 1585 | hdr = ipv6_hdr(skb); |
1da177e4 | 1586 | |
4bdc3d66 | 1587 | lookup: |
a583636a | 1588 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, __tcp_hdrlen(th), |
4297a0ef | 1589 | th->source, th->dest, inet6_iif(skb), sdif, |
3b24d854 | 1590 | &refcounted); |
1da177e4 LT |
1591 | if (!sk) |
1592 | goto no_tcp_socket; | |
1593 | ||
1594 | process: | |
1595 | if (sk->sk_state == TCP_TIME_WAIT) | |
1596 | goto do_time_wait; | |
1597 | ||
079096f1 ED |
1598 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
1599 | struct request_sock *req = inet_reqsk(sk); | |
e0f9759f | 1600 | bool req_stolen = false; |
7716682c | 1601 | struct sock *nsk; |
079096f1 ED |
1602 | |
1603 | sk = req->rsk_listener; | |
d14c77e0 | 1604 | if (tcp_v6_inbound_md5_hash(sk, skb, dif, sdif)) { |
e65c332d | 1605 | sk_drops_add(sk, skb); |
079096f1 ED |
1606 | reqsk_put(req); |
1607 | goto discard_it; | |
1608 | } | |
4fd44a98 FL |
1609 | if (tcp_checksum_complete(skb)) { |
1610 | reqsk_put(req); | |
1611 | goto csum_error; | |
1612 | } | |
7716682c | 1613 | if (unlikely(sk->sk_state != TCP_LISTEN)) { |
f03f2e15 | 1614 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
4bdc3d66 ED |
1615 | goto lookup; |
1616 | } | |
7716682c | 1617 | sock_hold(sk); |
3b24d854 | 1618 | refcounted = true; |
1f3b359f | 1619 | nsk = NULL; |
eeea10b8 ED |
1620 | if (!tcp_filter(sk, skb)) { |
1621 | th = (const struct tcphdr *)skb->data; | |
1622 | hdr = ipv6_hdr(skb); | |
1623 | tcp_v6_fill_cb(skb, hdr, th); | |
e0f9759f | 1624 | nsk = tcp_check_req(sk, skb, req, false, &req_stolen); |
eeea10b8 | 1625 | } |
079096f1 ED |
1626 | if (!nsk) { |
1627 | reqsk_put(req); | |
e0f9759f ED |
1628 | if (req_stolen) { |
1629 | /* Another cpu got exclusive access to req | |
1630 | * and created a full blown socket. | |
1631 | * Try to feed this packet to this socket | |
1632 | * instead of discarding it. | |
1633 | */ | |
1634 | tcp_v6_restore_cb(skb); | |
1635 | sock_put(sk); | |
1636 | goto lookup; | |
1637 | } | |
7716682c | 1638 | goto discard_and_relse; |
079096f1 ED |
1639 | } |
1640 | if (nsk == sk) { | |
079096f1 ED |
1641 | reqsk_put(req); |
1642 | tcp_v6_restore_cb(skb); | |
1643 | } else if (tcp_child_process(sk, nsk, skb)) { | |
1644 | tcp_v6_send_reset(nsk, skb); | |
7716682c | 1645 | goto discard_and_relse; |
079096f1 | 1646 | } else { |
7716682c | 1647 | sock_put(sk); |
079096f1 ED |
1648 | return 0; |
1649 | } | |
1650 | } | |
93a77c11 | 1651 | if (hdr->hop_limit < tcp_inet6_sk(sk)->min_hopcount) { |
02a1d6e7 | 1652 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
e802af9c SH |
1653 | goto discard_and_relse; |
1654 | } | |
1655 | ||
1da177e4 LT |
1656 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1657 | goto discard_and_relse; | |
1658 | ||
d14c77e0 | 1659 | if (tcp_v6_inbound_md5_hash(sk, skb, dif, sdif)) |
9ea88a15 | 1660 | goto discard_and_relse; |
9ea88a15 | 1661 | |
ac6e7800 | 1662 | if (tcp_filter(sk, skb)) |
1da177e4 | 1663 | goto discard_and_relse; |
ac6e7800 ED |
1664 | th = (const struct tcphdr *)skb->data; |
1665 | hdr = ipv6_hdr(skb); | |
eeea10b8 | 1666 | tcp_v6_fill_cb(skb, hdr, th); |
1da177e4 LT |
1667 | |
1668 | skb->dev = NULL; | |
1669 | ||
e994b2f0 ED |
1670 | if (sk->sk_state == TCP_LISTEN) { |
1671 | ret = tcp_v6_do_rcv(sk, skb); | |
1672 | goto put_and_return; | |
1673 | } | |
1674 | ||
1675 | sk_incoming_cpu_update(sk); | |
1676 | ||
293b9c42 | 1677 | bh_lock_sock_nested(sk); |
a44d6eac | 1678 | tcp_segs_in(tcp_sk(sk), skb); |
1da177e4 LT |
1679 | ret = 0; |
1680 | if (!sock_owned_by_user(sk)) { | |
8b27dae5 ED |
1681 | skb_to_free = sk->sk_rx_skb_cache; |
1682 | sk->sk_rx_skb_cache = NULL; | |
e7942d06 | 1683 | ret = tcp_v6_do_rcv(sk, skb); |
8b27dae5 ED |
1684 | } else { |
1685 | if (tcp_add_backlog(sk, skb)) | |
1686 | goto discard_and_relse; | |
1687 | skb_to_free = NULL; | |
6b03a53a | 1688 | } |
1da177e4 | 1689 | bh_unlock_sock(sk); |
8b27dae5 ED |
1690 | if (skb_to_free) |
1691 | __kfree_skb(skb_to_free); | |
e994b2f0 | 1692 | put_and_return: |
3b24d854 ED |
1693 | if (refcounted) |
1694 | sock_put(sk); | |
1da177e4 LT |
1695 | return ret ? -1 : 0; |
1696 | ||
1697 | no_tcp_socket: | |
1698 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1699 | goto discard_it; | |
1700 | ||
2dc49d16 ND |
1701 | tcp_v6_fill_cb(skb, hdr, th); |
1702 | ||
12e25e10 | 1703 | if (tcp_checksum_complete(skb)) { |
6a5dc9e5 | 1704 | csum_error: |
90bbcc60 | 1705 | __TCP_INC_STATS(net, TCP_MIB_CSUMERRORS); |
1da177e4 | 1706 | bad_packet: |
90bbcc60 | 1707 | __TCP_INC_STATS(net, TCP_MIB_INERRS); |
1da177e4 | 1708 | } else { |
cfb6eeb4 | 1709 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1710 | } |
1711 | ||
1712 | discard_it: | |
1da177e4 LT |
1713 | kfree_skb(skb); |
1714 | return 0; | |
1715 | ||
1716 | discard_and_relse: | |
532182cd | 1717 | sk_drops_add(sk, skb); |
3b24d854 ED |
1718 | if (refcounted) |
1719 | sock_put(sk); | |
1da177e4 LT |
1720 | goto discard_it; |
1721 | ||
1722 | do_time_wait: | |
1723 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1724 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1725 | goto discard_it; |
1726 | } | |
1727 | ||
2dc49d16 ND |
1728 | tcp_v6_fill_cb(skb, hdr, th); |
1729 | ||
6a5dc9e5 ED |
1730 | if (tcp_checksum_complete(skb)) { |
1731 | inet_twsk_put(inet_twsk(sk)); | |
1732 | goto csum_error; | |
1da177e4 LT |
1733 | } |
1734 | ||
9469c7b4 | 1735 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1736 | case TCP_TW_SYN: |
1737 | { | |
1738 | struct sock *sk2; | |
1739 | ||
c346dca1 | 1740 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
a583636a | 1741 | skb, __tcp_hdrlen(th), |
5ba24953 | 1742 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1743 | &ipv6_hdr(skb)->daddr, |
24b711ed DA |
1744 | ntohs(th->dest), |
1745 | tcp_v6_iif_l3_slave(skb), | |
4297a0ef | 1746 | sdif); |
53b24b8f | 1747 | if (sk2) { |
295ff7ed | 1748 | struct inet_timewait_sock *tw = inet_twsk(sk); |
dbe7faa4 | 1749 | inet_twsk_deschedule_put(tw); |
1da177e4 | 1750 | sk = sk2; |
4ad19de8 | 1751 | tcp_v6_restore_cb(skb); |
3b24d854 | 1752 | refcounted = false; |
1da177e4 LT |
1753 | goto process; |
1754 | } | |
1da177e4 | 1755 | } |
275757e6 | 1756 | /* to ACK */ |
a8eceea8 | 1757 | fallthrough; |
1da177e4 LT |
1758 | case TCP_TW_ACK: |
1759 | tcp_v6_timewait_ack(sk, skb); | |
1760 | break; | |
1761 | case TCP_TW_RST: | |
271c3b9b FW |
1762 | tcp_v6_send_reset(sk, skb); |
1763 | inet_twsk_deschedule_put(inet_twsk(sk)); | |
1764 | goto discard_it; | |
4aa956d8 WY |
1765 | case TCP_TW_SUCCESS: |
1766 | ; | |
1da177e4 LT |
1767 | } |
1768 | goto discard_it; | |
1769 | } | |
1770 | ||
97ff7ffb | 1771 | INDIRECT_CALLABLE_SCOPE void tcp_v6_early_demux(struct sk_buff *skb) |
c7109986 ED |
1772 | { |
1773 | const struct ipv6hdr *hdr; | |
1774 | const struct tcphdr *th; | |
1775 | struct sock *sk; | |
1776 | ||
1777 | if (skb->pkt_type != PACKET_HOST) | |
1778 | return; | |
1779 | ||
1780 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1781 | return; | |
1782 | ||
1783 | hdr = ipv6_hdr(skb); | |
1784 | th = tcp_hdr(skb); | |
1785 | ||
1786 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1787 | return; | |
1788 | ||
870c3151 | 1789 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
c7109986 ED |
1790 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
1791 | &hdr->saddr, th->source, | |
1792 | &hdr->daddr, ntohs(th->dest), | |
4297a0ef | 1793 | inet6_iif(skb), inet6_sdif(skb)); |
c7109986 ED |
1794 | if (sk) { |
1795 | skb->sk = sk; | |
1796 | skb->destructor = sock_edemux; | |
f7e4eb03 | 1797 | if (sk_fullsock(sk)) { |
d0c294c5 | 1798 | struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst); |
f3f12135 | 1799 | |
c7109986 | 1800 | if (dst) |
93a77c11 | 1801 | dst = dst_check(dst, tcp_inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1802 | if (dst && |
f3f12135 | 1803 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1804 | skb_dst_set_noref(skb, dst); |
1805 | } | |
1806 | } | |
1807 | } | |
1808 | ||
ccb7c410 DM |
1809 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1810 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1811 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 1812 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
1813 | }; |
1814 | ||
dd2e0b86 ED |
1815 | INDIRECT_CALLABLE_SCOPE void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
1816 | { | |
1817 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1818 | ||
1819 | __tcp_v6_send_check(skb, &np->saddr, &sk->sk_v6_daddr); | |
1820 | } | |
1821 | ||
35b2c321 | 1822 | const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1823 | .queue_xmit = inet6_csk_xmit, |
1824 | .send_check = tcp_v6_send_check, | |
1825 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1826 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1827 | .conn_request = tcp_v6_conn_request, |
1828 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1829 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1830 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1831 | .setsockopt = ipv6_setsockopt, |
1832 | .getsockopt = ipv6_getsockopt, | |
1833 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1834 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
4fab9071 | 1835 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 LT |
1836 | }; |
1837 | ||
cfb6eeb4 | 1838 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1839 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1840 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1841 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1842 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1843 | }; |
a928630a | 1844 | #endif |
cfb6eeb4 | 1845 | |
1da177e4 LT |
1846 | /* |
1847 | * TCP over IPv4 via INET6 API | |
1848 | */ | |
3b401a81 | 1849 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1850 | .queue_xmit = ip_queue_xmit, |
1851 | .send_check = tcp_v4_send_check, | |
1852 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1853 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1854 | .conn_request = tcp_v6_conn_request, |
1855 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1856 | .net_header_len = sizeof(struct iphdr), |
1857 | .setsockopt = ipv6_setsockopt, | |
1858 | .getsockopt = ipv6_getsockopt, | |
1859 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1860 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
4fab9071 | 1861 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 LT |
1862 | }; |
1863 | ||
cfb6eeb4 | 1864 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1865 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1866 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1867 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1868 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1869 | }; |
a928630a | 1870 | #endif |
cfb6eeb4 | 1871 | |
1da177e4 LT |
1872 | /* NOTE: A lot of things set to zero explicitly by call to |
1873 | * sk_alloc() so need not be done here. | |
1874 | */ | |
1875 | static int tcp_v6_init_sock(struct sock *sk) | |
1876 | { | |
6687e988 | 1877 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1878 | |
900f65d3 | 1879 | tcp_init_sock(sk); |
1da177e4 | 1880 | |
8292a17a | 1881 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1882 | |
cfb6eeb4 | 1883 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1884 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1885 | #endif |
1886 | ||
1da177e4 LT |
1887 | return 0; |
1888 | } | |
1889 | ||
7d06b2e0 | 1890 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1891 | { |
1da177e4 | 1892 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1893 | inet6_destroy_sock(sk); |
1da177e4 LT |
1894 | } |
1895 | ||
952a10be | 1896 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1897 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1898 | static void get_openreq6(struct seq_file *seq, |
aa3a0c8c | 1899 | const struct request_sock *req, int i) |
1da177e4 | 1900 | { |
fa76ce73 | 1901 | long ttd = req->rsk_timer.expires - jiffies; |
634fb979 ED |
1902 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1903 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1904 | |
1905 | if (ttd < 0) | |
1906 | ttd = 0; | |
1907 | ||
1da177e4 LT |
1908 | seq_printf(seq, |
1909 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1910 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1911 | i, |
1912 | src->s6_addr32[0], src->s6_addr32[1], | |
1913 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1914 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1915 | dest->s6_addr32[0], dest->s6_addr32[1], |
1916 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1917 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 1918 | TCP_SYN_RECV, |
4c99aa40 | 1919 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
1920 | 1, /* timers active (only the expire timer) */ |
1921 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1922 | req->num_timeout, |
aa3a0c8c ED |
1923 | from_kuid_munged(seq_user_ns(seq), |
1924 | sock_i_uid(req->rsk_listener)), | |
1ab1457c | 1925 | 0, /* non standard timer */ |
1da177e4 LT |
1926 | 0, /* open_requests have no inode */ |
1927 | 0, req); | |
1928 | } | |
1929 | ||
1930 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1931 | { | |
b71d1d42 | 1932 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1933 | __u16 destp, srcp; |
1934 | int timer_active; | |
1935 | unsigned long timer_expires; | |
cf533ea5 ED |
1936 | const struct inet_sock *inet = inet_sk(sp); |
1937 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1938 | const struct inet_connection_sock *icsk = inet_csk(sp); |
0536fcc0 | 1939 | const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq; |
00fd38d9 ED |
1940 | int rx_queue; |
1941 | int state; | |
1da177e4 | 1942 | |
efe4208f ED |
1943 | dest = &sp->sk_v6_daddr; |
1944 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1945 | destp = ntohs(inet->inet_dport); |
1946 | srcp = ntohs(inet->inet_sport); | |
463c84b9 | 1947 | |
ce3cf4ec | 1948 | if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
57dde7f7 | 1949 | icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT || |
ce3cf4ec | 1950 | icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { |
1da177e4 | 1951 | timer_active = 1; |
463c84b9 ACM |
1952 | timer_expires = icsk->icsk_timeout; |
1953 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1954 | timer_active = 4; |
463c84b9 | 1955 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1956 | } else if (timer_pending(&sp->sk_timer)) { |
1957 | timer_active = 2; | |
1958 | timer_expires = sp->sk_timer.expires; | |
1959 | } else { | |
1960 | timer_active = 0; | |
1961 | timer_expires = jiffies; | |
1962 | } | |
1963 | ||
986ffdfd | 1964 | state = inet_sk_state_load(sp); |
00fd38d9 | 1965 | if (state == TCP_LISTEN) |
288efe86 | 1966 | rx_queue = READ_ONCE(sp->sk_ack_backlog); |
00fd38d9 ED |
1967 | else |
1968 | /* Because we don't lock the socket, | |
1969 | * we might find a transient negative value. | |
1970 | */ | |
dba7d9b8 | 1971 | rx_queue = max_t(int, READ_ONCE(tp->rcv_nxt) - |
7db48e98 | 1972 | READ_ONCE(tp->copied_seq), 0); |
00fd38d9 | 1973 | |
1da177e4 LT |
1974 | seq_printf(seq, |
1975 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1976 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1977 | i, |
1978 | src->s6_addr32[0], src->s6_addr32[1], | |
1979 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1980 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1981 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
00fd38d9 | 1982 | state, |
0f317464 | 1983 | READ_ONCE(tp->write_seq) - tp->snd_una, |
00fd38d9 | 1984 | rx_queue, |
1da177e4 | 1985 | timer_active, |
a399a805 | 1986 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1987 | icsk->icsk_retransmits, |
a7cb5a49 | 1988 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1989 | icsk->icsk_probes_out, |
1da177e4 | 1990 | sock_i_ino(sp), |
41c6d650 | 1991 | refcount_read(&sp->sk_refcnt), sp, |
7be87351 SH |
1992 | jiffies_to_clock_t(icsk->icsk_rto), |
1993 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
31954cd8 | 1994 | (icsk->icsk_ack.quick << 1) | inet_csk_in_pingpong_mode(sp), |
0b6a05c1 | 1995 | tp->snd_cwnd, |
00fd38d9 | 1996 | state == TCP_LISTEN ? |
0536fcc0 | 1997 | fastopenq->max_qlen : |
0a672f74 | 1998 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) |
1da177e4 LT |
1999 | ); |
2000 | } | |
2001 | ||
1ab1457c | 2002 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 2003 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 2004 | { |
789f558c | 2005 | long delta = tw->tw_timer.expires - jiffies; |
b71d1d42 | 2006 | const struct in6_addr *dest, *src; |
1da177e4 | 2007 | __u16 destp, srcp; |
1da177e4 | 2008 | |
efe4208f ED |
2009 | dest = &tw->tw_v6_daddr; |
2010 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
2011 | destp = ntohs(tw->tw_dport); |
2012 | srcp = ntohs(tw->tw_sport); | |
2013 | ||
2014 | seq_printf(seq, | |
2015 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 2016 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
2017 | i, |
2018 | src->s6_addr32[0], src->s6_addr32[1], | |
2019 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2020 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2021 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2022 | tw->tw_substate, 0, 0, | |
a399a805 | 2023 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
41c6d650 | 2024 | refcount_read(&tw->tw_refcnt), tw); |
1da177e4 LT |
2025 | } |
2026 | ||
1da177e4 LT |
2027 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
2028 | { | |
2029 | struct tcp_iter_state *st; | |
05dbc7b5 | 2030 | struct sock *sk = v; |
1da177e4 LT |
2031 | |
2032 | if (v == SEQ_START_TOKEN) { | |
2033 | seq_puts(seq, | |
2034 | " sl " | |
2035 | "local_address " | |
2036 | "remote_address " | |
2037 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2038 | " uid timeout inode\n"); | |
2039 | goto out; | |
2040 | } | |
2041 | st = seq->private; | |
2042 | ||
079096f1 ED |
2043 | if (sk->sk_state == TCP_TIME_WAIT) |
2044 | get_timewait6_sock(seq, v, st->num); | |
2045 | else if (sk->sk_state == TCP_NEW_SYN_RECV) | |
aa3a0c8c | 2046 | get_openreq6(seq, v, st->num); |
079096f1 ED |
2047 | else |
2048 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
2049 | out: |
2050 | return 0; | |
2051 | } | |
2052 | ||
37d849bb CH |
2053 | static const struct seq_operations tcp6_seq_ops = { |
2054 | .show = tcp6_seq_show, | |
2055 | .start = tcp_seq_start, | |
2056 | .next = tcp_seq_next, | |
2057 | .stop = tcp_seq_stop, | |
2058 | }; | |
2059 | ||
1da177e4 | 2060 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 | 2061 | .family = AF_INET6, |
1da177e4 LT |
2062 | }; |
2063 | ||
2c8c1e72 | 2064 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 2065 | { |
c3506372 CH |
2066 | if (!proc_create_net_data("tcp6", 0444, net->proc_net, &tcp6_seq_ops, |
2067 | sizeof(struct tcp_iter_state), &tcp6_seq_afinfo)) | |
37d849bb CH |
2068 | return -ENOMEM; |
2069 | return 0; | |
1da177e4 LT |
2070 | } |
2071 | ||
6f8b13bc | 2072 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2073 | { |
37d849bb | 2074 | remove_proc_entry("tcp6", net->proc_net); |
1da177e4 LT |
2075 | } |
2076 | #endif | |
2077 | ||
2078 | struct proto tcpv6_prot = { | |
2079 | .name = "TCPv6", | |
2080 | .owner = THIS_MODULE, | |
2081 | .close = tcp_close, | |
d74bad4e | 2082 | .pre_connect = tcp_v6_pre_connect, |
1da177e4 LT |
2083 | .connect = tcp_v6_connect, |
2084 | .disconnect = tcp_disconnect, | |
463c84b9 | 2085 | .accept = inet_csk_accept, |
1da177e4 LT |
2086 | .ioctl = tcp_ioctl, |
2087 | .init = tcp_v6_init_sock, | |
2088 | .destroy = tcp_v6_destroy_sock, | |
2089 | .shutdown = tcp_shutdown, | |
2090 | .setsockopt = tcp_setsockopt, | |
2091 | .getsockopt = tcp_getsockopt, | |
4b9d07a4 | 2092 | .keepalive = tcp_set_keepalive, |
1da177e4 | 2093 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
2094 | .sendmsg = tcp_sendmsg, |
2095 | .sendpage = tcp_sendpage, | |
1da177e4 | 2096 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 2097 | .release_cb = tcp_release_cb, |
496611d7 | 2098 | .hash = inet6_hash, |
ab1e0a13 ACM |
2099 | .unhash = inet_unhash, |
2100 | .get_port = inet_csk_get_port, | |
1da177e4 | 2101 | .enter_memory_pressure = tcp_enter_memory_pressure, |
06044751 | 2102 | .leave_memory_pressure = tcp_leave_memory_pressure, |
c9bee3b7 | 2103 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
2104 | .sockets_allocated = &tcp_sockets_allocated, |
2105 | .memory_allocated = &tcp_memory_allocated, | |
2106 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2107 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 2108 | .sysctl_mem = sysctl_tcp_mem, |
356d1833 ED |
2109 | .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem), |
2110 | .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_tcp_rmem), | |
1da177e4 LT |
2111 | .max_header = MAX_TCP_HEADER, |
2112 | .obj_size = sizeof(struct tcp6_sock), | |
5f0d5a3a | 2113 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
6d6ee43e | 2114 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2115 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2116 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 2117 | .no_autobind = true, |
c1e64e29 | 2118 | .diag_destroy = tcp_abort, |
1da177e4 | 2119 | }; |
6abde0b2 | 2120 | EXPORT_SYMBOL_GPL(tcpv6_prot); |
1da177e4 | 2121 | |
a8e3bb34 DA |
2122 | /* thinking of making this const? Don't. |
2123 | * early_demux can change based on sysctl. | |
2124 | */ | |
39294c3d | 2125 | static struct inet6_protocol tcpv6_protocol = { |
c7109986 | 2126 | .early_demux = tcp_v6_early_demux, |
dddb64bc | 2127 | .early_demux_handler = tcp_v6_early_demux, |
1da177e4 LT |
2128 | .handler = tcp_v6_rcv, |
2129 | .err_handler = tcp_v6_err, | |
2130 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
2131 | }; | |
2132 | ||
1da177e4 LT |
2133 | static struct inet_protosw tcpv6_protosw = { |
2134 | .type = SOCK_STREAM, | |
2135 | .protocol = IPPROTO_TCP, | |
2136 | .prot = &tcpv6_prot, | |
2137 | .ops = &inet6_stream_ops, | |
d83d8461 ACM |
2138 | .flags = INET_PROTOSW_PERMANENT | |
2139 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2140 | }; |
2141 | ||
2c8c1e72 | 2142 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 2143 | { |
5677242f DL |
2144 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2145 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2146 | } |
2147 | ||
2c8c1e72 | 2148 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 2149 | { |
5677242f | 2150 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
2151 | } |
2152 | ||
2c8c1e72 | 2153 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 | 2154 | { |
1946e672 | 2155 | inet_twsk_purge(&tcp_hashinfo, AF_INET6); |
93ec926b DL |
2156 | } |
2157 | ||
2158 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
2159 | .init = tcpv6_net_init, |
2160 | .exit = tcpv6_net_exit, | |
2161 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
2162 | }; |
2163 | ||
7f4e4868 | 2164 | int __init tcpv6_init(void) |
1da177e4 | 2165 | { |
7f4e4868 DL |
2166 | int ret; |
2167 | ||
3336288a VY |
2168 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
2169 | if (ret) | |
c6b641a4 | 2170 | goto out; |
3336288a | 2171 | |
1da177e4 | 2172 | /* register inet6 protocol */ |
7f4e4868 DL |
2173 | ret = inet6_register_protosw(&tcpv6_protosw); |
2174 | if (ret) | |
2175 | goto out_tcpv6_protocol; | |
2176 | ||
93ec926b | 2177 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2178 | if (ret) |
2179 | goto out_tcpv6_protosw; | |
f870fa0b MM |
2180 | |
2181 | ret = mptcpv6_init(); | |
2182 | if (ret) | |
2183 | goto out_tcpv6_pernet_subsys; | |
2184 | ||
7f4e4868 DL |
2185 | out: |
2186 | return ret; | |
ae0f7d5f | 2187 | |
f870fa0b MM |
2188 | out_tcpv6_pernet_subsys: |
2189 | unregister_pernet_subsys(&tcpv6_net_ops); | |
7f4e4868 DL |
2190 | out_tcpv6_protosw: |
2191 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
2192 | out_tcpv6_protocol: |
2193 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
2194 | goto out; |
2195 | } | |
2196 | ||
09f7709f | 2197 | void tcpv6_exit(void) |
7f4e4868 | 2198 | { |
93ec926b | 2199 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2200 | inet6_unregister_protosw(&tcpv6_protosw); |
2201 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2202 | } |