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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 | ||
1da177e4 | 466 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
467 | sk->sk_err = err; |
468 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
469 | ||
470 | tcp_done(sk); | |
471 | } else | |
472 | sk->sk_err_soft = err; | |
473 | goto out; | |
474 | } | |
475 | ||
476 | if (!sock_owned_by_user(sk) && np->recverr) { | |
477 | sk->sk_err = err; | |
478 | sk->sk_error_report(sk); | |
479 | } else | |
480 | sk->sk_err_soft = err; | |
481 | ||
482 | out: | |
483 | bh_unlock_sock(sk); | |
484 | sock_put(sk); | |
32bbd879 | 485 | return 0; |
1da177e4 LT |
486 | } |
487 | ||
488 | ||
0f935dbe | 489 | static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst, |
d6274bd8 | 490 | struct flowi *fl, |
3840a06e | 491 | struct request_sock *req, |
ca6fb065 | 492 | struct tcp_fastopen_cookie *foc, |
b3d05147 | 493 | enum tcp_synack_type synack_type) |
1da177e4 | 494 | { |
634fb979 | 495 | struct inet_request_sock *ireq = inet_rsk(req); |
93a77c11 | 496 | struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
56ac42bc | 497 | struct ipv6_txoptions *opt; |
d6274bd8 | 498 | struct flowi6 *fl6 = &fl->u.ip6; |
4c99aa40 | 499 | struct sk_buff *skb; |
9494218f | 500 | int err = -ENOMEM; |
1da177e4 | 501 | |
9f10d3f6 | 502 | /* First, grab a route. */ |
f76b33c3 ED |
503 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req, |
504 | IPPROTO_TCP)) == NULL) | |
fd80eb94 | 505 | goto done; |
9494218f | 506 | |
b3d05147 | 507 | skb = tcp_make_synack(sk, dst, req, foc, synack_type); |
9494218f | 508 | |
1da177e4 | 509 | if (skb) { |
634fb979 ED |
510 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
511 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 512 | |
634fb979 | 513 | fl6->daddr = ireq->ir_v6_rmt_addr; |
53b24b8f | 514 | if (np->repflow && ireq->pktopts) |
df3687ff FF |
515 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); |
516 | ||
3e4006f0 | 517 | rcu_read_lock(); |
56ac42bc HD |
518 | opt = ireq->ipv6_opt; |
519 | if (!opt) | |
520 | opt = rcu_dereference(np->opt); | |
4f6570d7 ED |
521 | err = ip6_xmit(sk, skb, fl6, sk->sk_mark, opt, np->tclass, |
522 | sk->sk_priority); | |
3e4006f0 | 523 | rcu_read_unlock(); |
b9df3cb8 | 524 | err = net_xmit_eval(err); |
1da177e4 LT |
525 | } |
526 | ||
527 | done: | |
1da177e4 LT |
528 | return err; |
529 | } | |
530 | ||
72659ecc | 531 | |
60236fdd | 532 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 533 | { |
56ac42bc | 534 | kfree(inet_rsk(req)->ipv6_opt); |
634fb979 | 535 | kfree_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
536 | } |
537 | ||
cfb6eeb4 | 538 | #ifdef CONFIG_TCP_MD5SIG |
b83e3deb | 539 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk, |
dea53bb8 DA |
540 | const struct in6_addr *addr, |
541 | int l3index) | |
cfb6eeb4 | 542 | { |
dea53bb8 DA |
543 | return tcp_md5_do_lookup(sk, l3index, |
544 | (union tcp_md5_addr *)addr, AF_INET6); | |
cfb6eeb4 YH |
545 | } |
546 | ||
b83e3deb | 547 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk, |
fd3a154a | 548 | const struct sock *addr_sk) |
cfb6eeb4 | 549 | { |
dea53bb8 DA |
550 | int l3index; |
551 | ||
552 | l3index = l3mdev_master_ifindex_by_index(sock_net(sk), | |
553 | addr_sk->sk_bound_dev_if); | |
554 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr, | |
555 | l3index); | |
cfb6eeb4 YH |
556 | } |
557 | ||
8917a777 ID |
558 | static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, |
559 | char __user *optval, int optlen) | |
cfb6eeb4 YH |
560 | { |
561 | struct tcp_md5sig cmd; | |
562 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
dea53bb8 | 563 | int l3index = 0; |
8917a777 | 564 | u8 prefixlen; |
cfb6eeb4 YH |
565 | |
566 | if (optlen < sizeof(cmd)) | |
567 | return -EINVAL; | |
568 | ||
569 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
570 | return -EFAULT; | |
571 | ||
572 | if (sin6->sin6_family != AF_INET6) | |
573 | return -EINVAL; | |
574 | ||
8917a777 ID |
575 | if (optname == TCP_MD5SIG_EXT && |
576 | cmd.tcpm_flags & TCP_MD5SIG_FLAG_PREFIX) { | |
577 | prefixlen = cmd.tcpm_prefixlen; | |
578 | if (prefixlen > 128 || (ipv6_addr_v4mapped(&sin6->sin6_addr) && | |
579 | prefixlen > 32)) | |
580 | return -EINVAL; | |
581 | } else { | |
582 | prefixlen = ipv6_addr_v4mapped(&sin6->sin6_addr) ? 32 : 128; | |
583 | } | |
584 | ||
6b102db5 DA |
585 | if (optname == TCP_MD5SIG_EXT && |
586 | cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX) { | |
587 | struct net_device *dev; | |
588 | ||
589 | rcu_read_lock(); | |
590 | dev = dev_get_by_index_rcu(sock_net(sk), cmd.tcpm_ifindex); | |
591 | if (dev && netif_is_l3_master(dev)) | |
592 | l3index = dev->ifindex; | |
593 | rcu_read_unlock(); | |
594 | ||
595 | /* ok to reference set/not set outside of rcu; | |
596 | * right now device MUST be an L3 master | |
597 | */ | |
598 | if (!dev || !l3index) | |
599 | return -EINVAL; | |
600 | } | |
601 | ||
cfb6eeb4 | 602 | if (!cmd.tcpm_keylen) { |
e773e4fa | 603 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b | 604 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
6b102db5 DA |
605 | AF_INET, prefixlen, |
606 | l3index); | |
a915da9b | 607 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
dea53bb8 | 608 | AF_INET6, prefixlen, l3index); |
cfb6eeb4 YH |
609 | } |
610 | ||
611 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
612 | return -EINVAL; | |
613 | ||
a915da9b ED |
614 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
615 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
dea53bb8 DA |
616 | AF_INET, prefixlen, l3index, |
617 | cmd.tcpm_key, cmd.tcpm_keylen, | |
618 | GFP_KERNEL); | |
cfb6eeb4 | 619 | |
a915da9b | 620 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
dea53bb8 DA |
621 | AF_INET6, prefixlen, l3index, |
622 | cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
623 | } |
624 | ||
19689e38 ED |
625 | static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp, |
626 | const struct in6_addr *daddr, | |
627 | const struct in6_addr *saddr, | |
628 | const struct tcphdr *th, int nbytes) | |
cfb6eeb4 | 629 | { |
cfb6eeb4 | 630 | struct tcp6_pseudohdr *bp; |
49a72dfb | 631 | struct scatterlist sg; |
19689e38 | 632 | struct tcphdr *_th; |
8d26d76d | 633 | |
19689e38 | 634 | bp = hp->scratch; |
cfb6eeb4 | 635 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
636 | bp->saddr = *saddr; |
637 | bp->daddr = *daddr; | |
49a72dfb | 638 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 639 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 640 | |
19689e38 ED |
641 | _th = (struct tcphdr *)(bp + 1); |
642 | memcpy(_th, th, sizeof(*th)); | |
643 | _th->check = 0; | |
644 | ||
645 | sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th)); | |
646 | ahash_request_set_crypt(hp->md5_req, &sg, NULL, | |
647 | sizeof(*bp) + sizeof(*th)); | |
cf80e0e4 | 648 | return crypto_ahash_update(hp->md5_req); |
49a72dfb | 649 | } |
c7da57a1 | 650 | |
19689e38 | 651 | static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, |
b71d1d42 | 652 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 653 | const struct tcphdr *th) |
49a72dfb AL |
654 | { |
655 | struct tcp_md5sig_pool *hp; | |
cf80e0e4 | 656 | struct ahash_request *req; |
49a72dfb AL |
657 | |
658 | hp = tcp_get_md5sig_pool(); | |
659 | if (!hp) | |
660 | goto clear_hash_noput; | |
cf80e0e4 | 661 | req = hp->md5_req; |
49a72dfb | 662 | |
cf80e0e4 | 663 | if (crypto_ahash_init(req)) |
49a72dfb | 664 | goto clear_hash; |
19689e38 | 665 | if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2)) |
49a72dfb AL |
666 | goto clear_hash; |
667 | if (tcp_md5_hash_key(hp, key)) | |
668 | goto clear_hash; | |
cf80e0e4 HX |
669 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
670 | if (crypto_ahash_final(req)) | |
cfb6eeb4 | 671 | goto clear_hash; |
cfb6eeb4 | 672 | |
cfb6eeb4 | 673 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 674 | return 0; |
49a72dfb | 675 | |
cfb6eeb4 YH |
676 | clear_hash: |
677 | tcp_put_md5sig_pool(); | |
678 | clear_hash_noput: | |
679 | memset(md5_hash, 0, 16); | |
49a72dfb | 680 | return 1; |
cfb6eeb4 YH |
681 | } |
682 | ||
39f8e58e ED |
683 | static int tcp_v6_md5_hash_skb(char *md5_hash, |
684 | const struct tcp_md5sig_key *key, | |
318cf7aa | 685 | const struct sock *sk, |
318cf7aa | 686 | const struct sk_buff *skb) |
cfb6eeb4 | 687 | { |
b71d1d42 | 688 | const struct in6_addr *saddr, *daddr; |
49a72dfb | 689 | struct tcp_md5sig_pool *hp; |
cf80e0e4 | 690 | struct ahash_request *req; |
318cf7aa | 691 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 692 | |
39f8e58e ED |
693 | if (sk) { /* valid for establish/request sockets */ |
694 | saddr = &sk->sk_v6_rcv_saddr; | |
efe4208f | 695 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 696 | } else { |
b71d1d42 | 697 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
698 | saddr = &ip6h->saddr; |
699 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 700 | } |
49a72dfb AL |
701 | |
702 | hp = tcp_get_md5sig_pool(); | |
703 | if (!hp) | |
704 | goto clear_hash_noput; | |
cf80e0e4 | 705 | req = hp->md5_req; |
49a72dfb | 706 | |
cf80e0e4 | 707 | if (crypto_ahash_init(req)) |
49a72dfb AL |
708 | goto clear_hash; |
709 | ||
19689e38 | 710 | if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len)) |
49a72dfb AL |
711 | goto clear_hash; |
712 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
713 | goto clear_hash; | |
714 | if (tcp_md5_hash_key(hp, key)) | |
715 | goto clear_hash; | |
cf80e0e4 HX |
716 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
717 | if (crypto_ahash_final(req)) | |
49a72dfb AL |
718 | goto clear_hash; |
719 | ||
720 | tcp_put_md5sig_pool(); | |
721 | return 0; | |
722 | ||
723 | clear_hash: | |
724 | tcp_put_md5sig_pool(); | |
725 | clear_hash_noput: | |
726 | memset(md5_hash, 0, 16); | |
727 | return 1; | |
cfb6eeb4 YH |
728 | } |
729 | ||
ba8e275a ED |
730 | #endif |
731 | ||
732 | static bool tcp_v6_inbound_md5_hash(const struct sock *sk, | |
d14c77e0 DA |
733 | const struct sk_buff *skb, |
734 | int dif, int sdif) | |
cfb6eeb4 | 735 | { |
ba8e275a | 736 | #ifdef CONFIG_TCP_MD5SIG |
cf533ea5 | 737 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 738 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 739 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 740 | const struct tcphdr *th = tcp_hdr(skb); |
dea53bb8 | 741 | int genhash, l3index; |
cfb6eeb4 YH |
742 | u8 newhash[16]; |
743 | ||
dea53bb8 DA |
744 | /* sdif set, means packet ingressed via a device |
745 | * in an L3 domain and dif is set to the l3mdev | |
746 | */ | |
747 | l3index = sdif ? dif : 0; | |
748 | ||
749 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr, l3index); | |
7d5d5525 | 750 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 751 | |
785957d3 DM |
752 | /* We've parsed the options - do we have a hash? */ |
753 | if (!hash_expected && !hash_location) | |
ff74e23f | 754 | return false; |
785957d3 DM |
755 | |
756 | if (hash_expected && !hash_location) { | |
c10d9310 | 757 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
ff74e23f | 758 | return true; |
cfb6eeb4 YH |
759 | } |
760 | ||
785957d3 | 761 | if (!hash_expected && hash_location) { |
c10d9310 | 762 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
ff74e23f | 763 | return true; |
cfb6eeb4 YH |
764 | } |
765 | ||
766 | /* check the signature */ | |
49a72dfb AL |
767 | genhash = tcp_v6_md5_hash_skb(newhash, |
768 | hash_expected, | |
39f8e58e | 769 | NULL, skb); |
49a72dfb | 770 | |
cfb6eeb4 | 771 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
72145a68 | 772 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE); |
dea53bb8 | 773 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u L3 index %d\n", |
e87cc472 JP |
774 | genhash ? "failed" : "mismatch", |
775 | &ip6h->saddr, ntohs(th->source), | |
dea53bb8 | 776 | &ip6h->daddr, ntohs(th->dest), l3index); |
ff74e23f | 777 | return true; |
cfb6eeb4 | 778 | } |
ba8e275a | 779 | #endif |
ff74e23f | 780 | return false; |
cfb6eeb4 | 781 | } |
cfb6eeb4 | 782 | |
b40cf18e ED |
783 | static void tcp_v6_init_req(struct request_sock *req, |
784 | const struct sock *sk_listener, | |
16bea70a OP |
785 | struct sk_buff *skb) |
786 | { | |
c2027d1e | 787 | bool l3_slave = ipv6_l3mdev_skb(TCP_SKB_CB(skb)->header.h6.flags); |
16bea70a | 788 | struct inet_request_sock *ireq = inet_rsk(req); |
93a77c11 | 789 | const struct ipv6_pinfo *np = tcp_inet6_sk(sk_listener); |
16bea70a OP |
790 | |
791 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
792 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
793 | ||
16bea70a | 794 | /* So that link locals have meaning */ |
c2027d1e | 795 | if ((!sk_listener->sk_bound_dev_if || l3_slave) && |
16bea70a | 796 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
870c3151 | 797 | ireq->ir_iif = tcp_v6_iif(skb); |
16bea70a | 798 | |
04317daf | 799 | if (!TCP_SKB_CB(skb)->tcp_tw_isn && |
b40cf18e | 800 | (ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) || |
a224772d | 801 | np->rxopt.bits.rxinfo || |
16bea70a OP |
802 | np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim || |
803 | np->rxopt.bits.rxohlim || np->repflow)) { | |
63354797 | 804 | refcount_inc(&skb->users); |
16bea70a OP |
805 | ireq->pktopts = skb; |
806 | } | |
807 | } | |
808 | ||
f964629e ED |
809 | static struct dst_entry *tcp_v6_route_req(const struct sock *sk, |
810 | struct flowi *fl, | |
4396e461 | 811 | const struct request_sock *req) |
d94e0417 | 812 | { |
f76b33c3 | 813 | return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP); |
d94e0417 OP |
814 | } |
815 | ||
c6aefafb | 816 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 817 | .family = AF_INET6, |
2e6599cb | 818 | .obj_size = sizeof(struct tcp6_request_sock), |
5db92c99 | 819 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
820 | .send_ack = tcp_v6_reqsk_send_ack, |
821 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 822 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 823 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
824 | }; |
825 | ||
35b2c321 | 826 | const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
2aec4a29 OP |
827 | .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - |
828 | sizeof(struct ipv6hdr), | |
16bea70a | 829 | #ifdef CONFIG_TCP_MD5SIG |
fd3a154a | 830 | .req_md5_lookup = tcp_v6_md5_lookup, |
e3afe7b7 | 831 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
b6332e6c | 832 | #endif |
16bea70a | 833 | .init_req = tcp_v6_init_req, |
fb7b37a7 OP |
834 | #ifdef CONFIG_SYN_COOKIES |
835 | .cookie_init_seq = cookie_v6_init_sequence, | |
836 | #endif | |
d94e0417 | 837 | .route_req = tcp_v6_route_req, |
84b114b9 ED |
838 | .init_seq = tcp_v6_init_seq, |
839 | .init_ts_off = tcp_v6_init_ts_off, | |
d6274bd8 | 840 | .send_synack = tcp_v6_send_synack, |
16bea70a | 841 | }; |
cfb6eeb4 | 842 | |
a00e7444 | 843 | static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae ED |
844 | u32 ack, u32 win, u32 tsval, u32 tsecr, |
845 | int oif, struct tcp_md5sig_key *key, int rst, | |
e9a5dcee | 846 | u8 tclass, __be32 label, u32 priority) |
1da177e4 | 847 | { |
cf533ea5 ED |
848 | const struct tcphdr *th = tcp_hdr(skb); |
849 | struct tcphdr *t1; | |
1da177e4 | 850 | struct sk_buff *buff; |
4c9483b2 | 851 | struct flowi6 fl6; |
0f85feae | 852 | struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
e5047992 | 853 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 854 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 855 | struct dst_entry *dst; |
81ada62d | 856 | __be32 *topt; |
00483690 | 857 | __u32 mark = 0; |
1da177e4 | 858 | |
ee684b6f | 859 | if (tsecr) |
626e264d | 860 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 861 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
862 | if (key) |
863 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
864 | #endif | |
865 | ||
cfb6eeb4 | 866 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 867 | GFP_ATOMIC); |
63159f29 | 868 | if (!buff) |
1ab1457c | 869 | return; |
1da177e4 | 870 | |
cfb6eeb4 | 871 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 872 | |
d58ff351 | 873 | t1 = skb_push(buff, tot_len); |
6651ffc8 | 874 | skb_reset_transport_header(buff); |
1da177e4 LT |
875 | |
876 | /* Swap the send and the receive. */ | |
877 | memset(t1, 0, sizeof(*t1)); | |
878 | t1->dest = th->source; | |
879 | t1->source = th->dest; | |
cfb6eeb4 | 880 | t1->doff = tot_len / 4; |
626e264d IJ |
881 | t1->seq = htonl(seq); |
882 | t1->ack_seq = htonl(ack); | |
883 | t1->ack = !rst || !th->ack; | |
884 | t1->rst = rst; | |
885 | t1->window = htons(win); | |
1da177e4 | 886 | |
81ada62d IJ |
887 | topt = (__be32 *)(t1 + 1); |
888 | ||
ee684b6f | 889 | if (tsecr) { |
626e264d IJ |
890 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
891 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
892 | *topt++ = htonl(tsval); |
893 | *topt++ = htonl(tsecr); | |
626e264d IJ |
894 | } |
895 | ||
cfb6eeb4 YH |
896 | #ifdef CONFIG_TCP_MD5SIG |
897 | if (key) { | |
81ada62d IJ |
898 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
899 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
900 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
901 | &ipv6_hdr(skb)->saddr, |
902 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
903 | } |
904 | #endif | |
905 | ||
4c9483b2 | 906 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
907 | fl6.daddr = ipv6_hdr(skb)->saddr; |
908 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 909 | fl6.flowlabel = label; |
1da177e4 | 910 | |
e5700aff DM |
911 | buff->ip_summed = CHECKSUM_PARTIAL; |
912 | buff->csum = 0; | |
913 | ||
4c9483b2 | 914 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 915 | |
4c9483b2 | 916 | fl6.flowi6_proto = IPPROTO_TCP; |
a36dbdb2 | 917 | if (rt6_need_strict(&fl6.daddr) && !oif) |
870c3151 | 918 | fl6.flowi6_oif = tcp_v6_iif(skb); |
9b6c14d5 DA |
919 | else { |
920 | if (!oif && netif_index_is_l3_master(net, skb->skb_iif)) | |
921 | oif = skb->skb_iif; | |
922 | ||
923 | fl6.flowi6_oif = oif; | |
924 | } | |
1d2f7b2d | 925 | |
c67b8555 ED |
926 | if (sk) { |
927 | if (sk->sk_state == TCP_TIME_WAIT) { | |
928 | mark = inet_twsk(sk)->tw_mark; | |
929 | /* autoflowlabel relies on buff->hash */ | |
930 | skb_set_hash(buff, inet_twsk(sk)->tw_txhash, | |
931 | PKT_HASH_TYPE_L4); | |
932 | } else { | |
933 | mark = sk->sk_mark; | |
934 | } | |
d6fb396c | 935 | buff->tstamp = tcp_transmit_time(sk); |
c67b8555 | 936 | } |
00483690 | 937 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark) ?: mark; |
1958b856 DM |
938 | fl6.fl6_dport = t1->dest; |
939 | fl6.fl6_sport = t1->source; | |
e2d118a1 | 940 | fl6.flowi6_uid = sock_net_uid(net, sk && sk_fullsock(sk) ? sk : NULL); |
4c9483b2 | 941 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 942 | |
c20121ae DL |
943 | /* Pass a socket to ip6_dst_lookup either it is for RST |
944 | * Underlying function will use this to retrieve the network | |
945 | * namespace | |
946 | */ | |
c4e85f73 | 947 | dst = ip6_dst_lookup_flow(sock_net(ctl_sk), ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
948 | if (!IS_ERR(dst)) { |
949 | skb_dst_set(buff, dst); | |
4f6570d7 | 950 | ip6_xmit(ctl_sk, buff, &fl6, fl6.flowi6_mark, NULL, tclass, |
e9a5dcee | 951 | priority); |
c10d9310 | 952 | TCP_INC_STATS(net, TCP_MIB_OUTSEGS); |
68d0c6d3 | 953 | if (rst) |
c10d9310 | 954 | TCP_INC_STATS(net, TCP_MIB_OUTRSTS); |
68d0c6d3 | 955 | return; |
1da177e4 LT |
956 | } |
957 | ||
958 | kfree_skb(buff); | |
959 | } | |
960 | ||
a00e7444 | 961 | static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) |
1da177e4 | 962 | { |
cf533ea5 | 963 | const struct tcphdr *th = tcp_hdr(skb); |
323a53c4 | 964 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
626e264d | 965 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 966 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
967 | #ifdef CONFIG_TCP_MD5SIG |
968 | const __u8 *hash_location = NULL; | |
658ddaaf SL |
969 | unsigned char newhash[16]; |
970 | int genhash; | |
971 | struct sock *sk1 = NULL; | |
972 | #endif | |
323a53c4 | 973 | __be32 label = 0; |
e9a5dcee | 974 | u32 priority = 0; |
323a53c4 | 975 | struct net *net; |
c24b14c4 | 976 | int oif = 0; |
1da177e4 | 977 | |
626e264d | 978 | if (th->rst) |
1da177e4 LT |
979 | return; |
980 | ||
c3658e8d ED |
981 | /* If sk not NULL, it means we did a successful lookup and incoming |
982 | * route had to be correct. prequeue might have dropped our dst. | |
983 | */ | |
984 | if (!sk && !ipv6_unicast_destination(skb)) | |
626e264d | 985 | return; |
1da177e4 | 986 | |
39209673 | 987 | net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
cfb6eeb4 | 988 | #ifdef CONFIG_TCP_MD5SIG |
3b24d854 | 989 | rcu_read_lock(); |
658ddaaf | 990 | hash_location = tcp_parse_md5sig_option(th); |
271c3b9b | 991 | if (sk && sk_fullsock(sk)) { |
dea53bb8 DA |
992 | int l3index; |
993 | ||
994 | /* sdif set, means packet ingressed via a device | |
995 | * in an L3 domain and inet_iif is set to it. | |
996 | */ | |
997 | l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0; | |
998 | key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr, l3index); | |
e46787f0 | 999 | } else if (hash_location) { |
d14c77e0 DA |
1000 | int dif = tcp_v6_iif_l3_slave(skb); |
1001 | int sdif = tcp_v6_sdif(skb); | |
dea53bb8 | 1002 | int l3index; |
d14c77e0 | 1003 | |
658ddaaf SL |
1004 | /* |
1005 | * active side is lost. Try to find listening socket through | |
1006 | * source port, and then find md5 key through listening socket. | |
1007 | * we are not loose security here: | |
1008 | * Incoming packet is checked with md5 hash with finding key, | |
1009 | * no RST generated if md5 hash doesn't match. | |
1010 | */ | |
323a53c4 | 1011 | sk1 = inet6_lookup_listener(net, |
a583636a CG |
1012 | &tcp_hashinfo, NULL, 0, |
1013 | &ipv6h->saddr, | |
5ba24953 | 1014 | th->source, &ipv6h->daddr, |
d14c77e0 | 1015 | ntohs(th->source), dif, sdif); |
658ddaaf | 1016 | if (!sk1) |
3b24d854 | 1017 | goto out; |
658ddaaf | 1018 | |
dea53bb8 DA |
1019 | /* sdif set, means packet ingressed via a device |
1020 | * in an L3 domain and dif is set to it. | |
1021 | */ | |
1022 | l3index = tcp_v6_sdif(skb) ? dif : 0; | |
1023 | ||
1024 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr, l3index); | |
658ddaaf | 1025 | if (!key) |
3b24d854 | 1026 | goto out; |
658ddaaf | 1027 | |
39f8e58e | 1028 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb); |
658ddaaf | 1029 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
3b24d854 | 1030 | goto out; |
658ddaaf | 1031 | } |
cfb6eeb4 YH |
1032 | #endif |
1033 | ||
626e264d IJ |
1034 | if (th->ack) |
1035 | seq = ntohl(th->ack_seq); | |
1036 | else | |
1037 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
1038 | (th->doff << 2); | |
1da177e4 | 1039 | |
c24b14c4 SL |
1040 | if (sk) { |
1041 | oif = sk->sk_bound_dev_if; | |
052e0690 ED |
1042 | if (sk_fullsock(sk)) { |
1043 | const struct ipv6_pinfo *np = tcp_inet6_sk(sk); | |
1044 | ||
5c487bb9 | 1045 | trace_tcp_send_reset(sk, skb); |
052e0690 ED |
1046 | if (np->repflow) |
1047 | label = ip6_flowlabel(ipv6h); | |
e9a5dcee | 1048 | priority = sk->sk_priority; |
052e0690 | 1049 | } |
f6c0f5d2 | 1050 | if (sk->sk_state == TCP_TIME_WAIT) { |
50a8accf | 1051 | label = cpu_to_be32(inet_twsk(sk)->tw_flowlabel); |
f6c0f5d2 ED |
1052 | priority = inet_twsk(sk)->tw_priority; |
1053 | } | |
323a53c4 | 1054 | } else { |
a346abe0 | 1055 | if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_TCP_RESET) |
323a53c4 | 1056 | label = ip6_flowlabel(ipv6h); |
c24b14c4 SL |
1057 | } |
1058 | ||
323a53c4 | 1059 | tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, |
e9a5dcee | 1060 | label, priority); |
658ddaaf SL |
1061 | |
1062 | #ifdef CONFIG_TCP_MD5SIG | |
3b24d854 ED |
1063 | out: |
1064 | rcu_read_unlock(); | |
658ddaaf | 1065 | #endif |
626e264d | 1066 | } |
1da177e4 | 1067 | |
a00e7444 | 1068 | static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae | 1069 | u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, |
1d13a96c | 1070 | struct tcp_md5sig_key *key, u8 tclass, |
e9a5dcee | 1071 | __be32 label, u32 priority) |
626e264d | 1072 | { |
0f85feae | 1073 | tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0, |
e9a5dcee | 1074 | tclass, label, priority); |
1da177e4 LT |
1075 | } |
1076 | ||
1077 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1078 | { | |
8feaf0c0 | 1079 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 1080 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 1081 | |
0f85feae | 1082 | tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 1083 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
9a568de4 | 1084 | tcp_time_stamp_raw() + tcptw->tw_ts_offset, |
9c76a114 | 1085 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
f6c0f5d2 | 1086 | tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel), tw->tw_priority); |
1da177e4 | 1087 | |
8feaf0c0 | 1088 | inet_twsk_put(tw); |
1da177e4 LT |
1089 | } |
1090 | ||
a00e7444 | 1091 | static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, |
6edafaaf | 1092 | struct request_sock *req) |
1da177e4 | 1093 | { |
dea53bb8 DA |
1094 | int l3index; |
1095 | ||
1096 | l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0; | |
1097 | ||
3a19ce0e DL |
1098 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
1099 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
1100 | */ | |
20a2b49f ED |
1101 | /* RFC 7323 2.3 |
1102 | * The window field (SEG.WND) of every outgoing segment, with the | |
1103 | * exception of <SYN> segments, MUST be right-shifted by | |
1104 | * Rcv.Wind.Shift bits: | |
1105 | */ | |
0f85feae | 1106 | tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ? |
3a19ce0e | 1107 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
20a2b49f ED |
1108 | tcp_rsk(req)->rcv_nxt, |
1109 | req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale, | |
9a568de4 | 1110 | tcp_time_stamp_raw() + tcp_rsk(req)->ts_off, |
95a22cae | 1111 | req->ts_recent, sk->sk_bound_dev_if, |
dea53bb8 | 1112 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr, l3index), |
e9a5dcee | 1113 | 0, 0, sk->sk_priority); |
1da177e4 LT |
1114 | } |
1115 | ||
1116 | ||
079096f1 | 1117 | static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1118 | { |
079096f1 | 1119 | #ifdef CONFIG_SYN_COOKIES |
aa8223c7 | 1120 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 1121 | |
af9b4738 | 1122 | if (!th->syn) |
c6aefafb | 1123 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1124 | #endif |
1125 | return sk; | |
1126 | } | |
1127 | ||
9349d600 PP |
1128 | u16 tcp_v6_get_syncookie(struct sock *sk, struct ipv6hdr *iph, |
1129 | struct tcphdr *th, u32 *cookie) | |
1130 | { | |
1131 | u16 mss = 0; | |
1132 | #ifdef CONFIG_SYN_COOKIES | |
1133 | mss = tcp_get_syncookie_mss(&tcp6_request_sock_ops, | |
1134 | &tcp_request_sock_ipv6_ops, sk, th); | |
1135 | if (mss) { | |
1136 | *cookie = __cookie_v6_init_sequence(iph, th, &mss); | |
1137 | tcp_synq_overflow(sk); | |
1138 | } | |
1139 | #endif | |
1140 | return mss; | |
1141 | } | |
1142 | ||
1da177e4 LT |
1143 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
1144 | { | |
1da177e4 LT |
1145 | if (skb->protocol == htons(ETH_P_IP)) |
1146 | return tcp_v4_conn_request(sk, skb); | |
1147 | ||
1148 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1149 | goto drop; |
1da177e4 | 1150 | |
1fb6f159 OP |
1151 | return tcp_conn_request(&tcp6_request_sock_ops, |
1152 | &tcp_request_sock_ipv6_ops, sk, skb); | |
1da177e4 LT |
1153 | |
1154 | drop: | |
9caad864 | 1155 | tcp_listendrop(sk); |
1da177e4 LT |
1156 | return 0; /* don't send reset */ |
1157 | } | |
1158 | ||
ebf6c9cb ED |
1159 | static void tcp_v6_restore_cb(struct sk_buff *skb) |
1160 | { | |
1161 | /* We need to move header back to the beginning if xfrm6_policy_check() | |
1162 | * and tcp_v6_fill_cb() are going to be called again. | |
1163 | * ip6_datagram_recv_specific_ctl() also expects IP6CB to be there. | |
1164 | */ | |
1165 | memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6, | |
1166 | sizeof(struct inet6_skb_parm)); | |
1167 | } | |
1168 | ||
0c27171e | 1169 | static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, |
4c99aa40 | 1170 | struct request_sock *req, |
5e0724d0 ED |
1171 | struct dst_entry *dst, |
1172 | struct request_sock *req_unhash, | |
1173 | bool *own_req) | |
1da177e4 | 1174 | { |
634fb979 | 1175 | struct inet_request_sock *ireq; |
0c27171e | 1176 | struct ipv6_pinfo *newnp; |
93a77c11 | 1177 | const struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
45f6fad8 | 1178 | struct ipv6_txoptions *opt; |
1da177e4 LT |
1179 | struct inet_sock *newinet; |
1180 | struct tcp_sock *newtp; | |
1181 | struct sock *newsk; | |
cfb6eeb4 YH |
1182 | #ifdef CONFIG_TCP_MD5SIG |
1183 | struct tcp_md5sig_key *key; | |
dea53bb8 | 1184 | int l3index; |
cfb6eeb4 | 1185 | #endif |
3840a06e | 1186 | struct flowi6 fl6; |
1da177e4 LT |
1187 | |
1188 | if (skb->protocol == htons(ETH_P_IP)) { | |
1189 | /* | |
1190 | * v6 mapped | |
1191 | */ | |
1192 | ||
5e0724d0 ED |
1193 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst, |
1194 | req_unhash, own_req); | |
1da177e4 | 1195 | |
63159f29 | 1196 | if (!newsk) |
1da177e4 LT |
1197 | return NULL; |
1198 | ||
93a77c11 | 1199 | inet_sk(newsk)->pinet6 = tcp_inet6_sk(newsk); |
1da177e4 LT |
1200 | |
1201 | newinet = inet_sk(newsk); | |
93a77c11 | 1202 | newnp = tcp_inet6_sk(newsk); |
1da177e4 LT |
1203 | newtp = tcp_sk(newsk); |
1204 | ||
1205 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1206 | ||
d1e559d0 | 1207 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
1da177e4 | 1208 | |
8292a17a | 1209 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
cec37a6e | 1210 | if (sk_is_mptcp(newsk)) |
31484d56 | 1211 | mptcpv6_handle_mapped(newsk, true); |
1da177e4 | 1212 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1213 | #ifdef CONFIG_TCP_MD5SIG |
1214 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1215 | #endif | |
1216 | ||
83eaddab | 1217 | newnp->ipv6_mc_list = NULL; |
676a1184 YZ |
1218 | newnp->ipv6_ac_list = NULL; |
1219 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1220 | newnp->pktoptions = NULL; |
1221 | newnp->opt = NULL; | |
89e41309 ED |
1222 | newnp->mcast_oif = inet_iif(skb); |
1223 | newnp->mcast_hops = ip_hdr(skb)->ttl; | |
1224 | newnp->rcv_flowinfo = 0; | |
df3687ff | 1225 | if (np->repflow) |
89e41309 | 1226 | newnp->flow_label = 0; |
1da177e4 | 1227 | |
e6848976 ACM |
1228 | /* |
1229 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1230 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1231 | * that function for the gory details. -acme | |
1da177e4 | 1232 | */ |
1da177e4 LT |
1233 | |
1234 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1235 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1236 | Sync it now. |
1237 | */ | |
d83d8461 | 1238 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1239 | |
1240 | return newsk; | |
1241 | } | |
1242 | ||
634fb979 | 1243 | ireq = inet_rsk(req); |
1da177e4 LT |
1244 | |
1245 | if (sk_acceptq_is_full(sk)) | |
1246 | goto out_overflow; | |
1247 | ||
493f377d | 1248 | if (!dst) { |
f76b33c3 | 1249 | dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_TCP); |
493f377d | 1250 | if (!dst) |
1da177e4 | 1251 | goto out; |
1ab1457c | 1252 | } |
1da177e4 LT |
1253 | |
1254 | newsk = tcp_create_openreq_child(sk, req, skb); | |
63159f29 | 1255 | if (!newsk) |
093d2823 | 1256 | goto out_nonewsk; |
1da177e4 | 1257 | |
e6848976 ACM |
1258 | /* |
1259 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1260 | * count here, tcp_create_openreq_child now does this for us, see the | |
1261 | * comment in that function for the gory details. -acme | |
1262 | */ | |
1da177e4 | 1263 | |
59eed279 | 1264 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
6bd4f355 | 1265 | ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1266 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 | 1267 | |
93a77c11 | 1268 | inet_sk(newsk)->pinet6 = tcp_inet6_sk(newsk); |
1da177e4 LT |
1269 | |
1270 | newtp = tcp_sk(newsk); | |
1271 | newinet = inet_sk(newsk); | |
93a77c11 | 1272 | newnp = tcp_inet6_sk(newsk); |
1da177e4 LT |
1273 | |
1274 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1275 | ||
634fb979 ED |
1276 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1277 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1278 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1279 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1280 | |
1ab1457c | 1281 | /* Now IPv6 options... |
1da177e4 LT |
1282 | |
1283 | First: no IPv4 options. | |
1284 | */ | |
f6d8bd05 | 1285 | newinet->inet_opt = NULL; |
83eaddab | 1286 | newnp->ipv6_mc_list = NULL; |
676a1184 | 1287 | newnp->ipv6_ac_list = NULL; |
d35690be | 1288 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1289 | |
1290 | /* Clone RX bits */ | |
1291 | newnp->rxopt.all = np->rxopt.all; | |
1292 | ||
1da177e4 | 1293 | newnp->pktoptions = NULL; |
1da177e4 | 1294 | newnp->opt = NULL; |
870c3151 | 1295 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1296 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1297 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1298 | if (np->repflow) |
1299 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 LT |
1300 | |
1301 | /* Clone native IPv6 options from listening socket (if any) | |
1302 | ||
1303 | Yes, keeping reference count would be much more clever, | |
1304 | but we make one more one thing there: reattach optmem | |
1305 | to newsk. | |
1306 | */ | |
56ac42bc HD |
1307 | opt = ireq->ipv6_opt; |
1308 | if (!opt) | |
1309 | opt = rcu_dereference(np->opt); | |
45f6fad8 ED |
1310 | if (opt) { |
1311 | opt = ipv6_dup_options(newsk, opt); | |
1312 | RCU_INIT_POINTER(newnp->opt, opt); | |
1313 | } | |
d83d8461 | 1314 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
1315 | if (opt) |
1316 | inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen + | |
1317 | opt->opt_flen; | |
1da177e4 | 1318 | |
81164413 DB |
1319 | tcp_ca_openreq_child(newsk, dst); |
1320 | ||
1da177e4 | 1321 | tcp_sync_mss(newsk, dst_mtu(dst)); |
3541f9e8 | 1322 | newtp->advmss = tcp_mss_clamp(tcp_sk(sk), dst_metric_advmss(dst)); |
d135c522 | 1323 | |
1da177e4 LT |
1324 | tcp_initialize_rcv_mss(newsk); |
1325 | ||
c720c7e8 ED |
1326 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1327 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1328 | |
cfb6eeb4 | 1329 | #ifdef CONFIG_TCP_MD5SIG |
dea53bb8 DA |
1330 | l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif); |
1331 | ||
cfb6eeb4 | 1332 | /* Copy over the MD5 key from the original socket */ |
dea53bb8 | 1333 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr, l3index); |
53b24b8f | 1334 | if (key) { |
cfb6eeb4 YH |
1335 | /* We're using one, so create a matching key |
1336 | * on the newsk structure. If we fail to get | |
1337 | * memory, then we end up not copying the key | |
1338 | * across. Shucks. | |
1339 | */ | |
efe4208f | 1340 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
dea53bb8 | 1341 | AF_INET6, 128, l3index, key->key, key->keylen, |
7450aaf6 | 1342 | sk_gfp_mask(sk, GFP_ATOMIC)); |
cfb6eeb4 YH |
1343 | } |
1344 | #endif | |
1345 | ||
093d2823 | 1346 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1347 | inet_csk_prepare_forced_close(newsk); |
1348 | tcp_done(newsk); | |
093d2823 BS |
1349 | goto out; |
1350 | } | |
5e0724d0 | 1351 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); |
805c4bc0 | 1352 | if (*own_req) { |
49a496c9 | 1353 | tcp_move_syn(newtp, req); |
805c4bc0 ED |
1354 | |
1355 | /* Clone pktoptions received with SYN, if we own the req */ | |
1356 | if (ireq->pktopts) { | |
1357 | newnp->pktoptions = skb_clone(ireq->pktopts, | |
7450aaf6 | 1358 | sk_gfp_mask(sk, GFP_ATOMIC)); |
805c4bc0 ED |
1359 | consume_skb(ireq->pktopts); |
1360 | ireq->pktopts = NULL; | |
ebf6c9cb ED |
1361 | if (newnp->pktoptions) { |
1362 | tcp_v6_restore_cb(newnp->pktoptions); | |
805c4bc0 | 1363 | skb_set_owner_r(newnp->pktoptions, newsk); |
ebf6c9cb | 1364 | } |
805c4bc0 | 1365 | } |
ce105008 | 1366 | } |
1da177e4 LT |
1367 | |
1368 | return newsk; | |
1369 | ||
1370 | out_overflow: | |
02a1d6e7 | 1371 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1372 | out_nonewsk: |
1da177e4 | 1373 | dst_release(dst); |
093d2823 | 1374 | out: |
9caad864 | 1375 | tcp_listendrop(sk); |
1da177e4 LT |
1376 | return NULL; |
1377 | } | |
1378 | ||
1da177e4 | 1379 | /* The socket must have it's spinlock held when we get |
e994b2f0 | 1380 | * here, unless it is a TCP_LISTEN socket. |
1da177e4 LT |
1381 | * |
1382 | * We have a potential double-lock case here, so even when | |
1383 | * doing backlog processing we use the BH locking scheme. | |
1384 | * This is because we cannot sleep with the original spinlock | |
1385 | * held. | |
1386 | */ | |
1387 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1388 | { | |
93a77c11 | 1389 | struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
1da177e4 | 1390 | struct sk_buff *opt_skb = NULL; |
93a77c11 | 1391 | struct tcp_sock *tp; |
1da177e4 LT |
1392 | |
1393 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1394 | goes to IPv4 receive handler and backlogged. | |
1395 | From backlog it always goes here. Kerboom... | |
1396 | Fortunately, tcp_rcv_established and rcv_established | |
1397 | handle them correctly, but it is not case with | |
1398 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1399 | */ | |
1400 | ||
1401 | if (skb->protocol == htons(ETH_P_IP)) | |
1402 | return tcp_v4_do_rcv(sk, skb); | |
1403 | ||
1da177e4 LT |
1404 | /* |
1405 | * socket locking is here for SMP purposes as backlog rcv | |
1406 | * is currently called with bh processing disabled. | |
1407 | */ | |
1408 | ||
1409 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1410 | ||
1411 | Yes, guys, it is the only place in our code, where we | |
1412 | may make it not affecting IPv4. | |
1413 | The rest of code is protocol independent, | |
1414 | and I do not like idea to uglify IPv4. | |
1415 | ||
1416 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1417 | looks not very well thought. For now we latch | |
1418 | options, received in the last packet, enqueued | |
1419 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1420 | --ANK (980728) |
1da177e4 LT |
1421 | */ |
1422 | if (np->rxopt.all) | |
7450aaf6 | 1423 | opt_skb = skb_clone(skb, sk_gfp_mask(sk, GFP_ATOMIC)); |
1da177e4 LT |
1424 | |
1425 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1426 | struct dst_entry *dst = sk->sk_rx_dst; |
1427 | ||
bdeab991 | 1428 | sock_rps_save_rxhash(sk, skb); |
3d97379a | 1429 | sk_mark_napi_id(sk, skb); |
5d299f3d ED |
1430 | if (dst) { |
1431 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1432 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1433 | dst_release(dst); | |
1434 | sk->sk_rx_dst = NULL; | |
1435 | } | |
1436 | } | |
1437 | ||
3d97d88e | 1438 | tcp_rcv_established(sk, skb); |
1da177e4 LT |
1439 | if (opt_skb) |
1440 | goto ipv6_pktoptions; | |
1441 | return 0; | |
1442 | } | |
1443 | ||
12e25e10 | 1444 | if (tcp_checksum_complete(skb)) |
1da177e4 LT |
1445 | goto csum_err; |
1446 | ||
1ab1457c | 1447 | if (sk->sk_state == TCP_LISTEN) { |
079096f1 ED |
1448 | struct sock *nsk = tcp_v6_cookie_check(sk, skb); |
1449 | ||
1da177e4 LT |
1450 | if (!nsk) |
1451 | goto discard; | |
1452 | ||
4c99aa40 | 1453 | if (nsk != sk) { |
1da177e4 LT |
1454 | if (tcp_child_process(sk, nsk, skb)) |
1455 | goto reset; | |
1456 | if (opt_skb) | |
1457 | __kfree_skb(opt_skb); | |
1458 | return 0; | |
1459 | } | |
47482f13 | 1460 | } else |
bdeab991 | 1461 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1462 | |
72ab4a86 | 1463 | if (tcp_rcv_state_process(sk, skb)) |
1da177e4 | 1464 | goto reset; |
1da177e4 LT |
1465 | if (opt_skb) |
1466 | goto ipv6_pktoptions; | |
1467 | return 0; | |
1468 | ||
1469 | reset: | |
cfb6eeb4 | 1470 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1471 | discard: |
1472 | if (opt_skb) | |
1473 | __kfree_skb(opt_skb); | |
1474 | kfree_skb(skb); | |
1475 | return 0; | |
1476 | csum_err: | |
c10d9310 ED |
1477 | TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS); |
1478 | TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS); | |
1da177e4 LT |
1479 | goto discard; |
1480 | ||
1481 | ||
1482 | ipv6_pktoptions: | |
1483 | /* Do you ask, what is it? | |
1484 | ||
1485 | 1. skb was enqueued by tcp. | |
1486 | 2. skb is added to tail of read queue, rather than out of order. | |
1487 | 3. socket is not in passive state. | |
1488 | 4. Finally, it really contains options, which user wants to receive. | |
1489 | */ | |
1490 | tp = tcp_sk(sk); | |
1491 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1492 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1493 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
870c3151 | 1494 | np->mcast_oif = tcp_v6_iif(opt_skb); |
333fad53 | 1495 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1496 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
82e9f105 | 1497 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1498 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
df3687ff FF |
1499 | if (np->repflow) |
1500 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
a224772d | 1501 | if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) { |
1da177e4 | 1502 | skb_set_owner_r(opt_skb, sk); |
8ce48623 | 1503 | tcp_v6_restore_cb(opt_skb); |
1da177e4 LT |
1504 | opt_skb = xchg(&np->pktoptions, opt_skb); |
1505 | } else { | |
1506 | __kfree_skb(opt_skb); | |
1507 | opt_skb = xchg(&np->pktoptions, NULL); | |
1508 | } | |
1509 | } | |
1510 | ||
800d55f1 | 1511 | kfree_skb(opt_skb); |
1da177e4 LT |
1512 | return 0; |
1513 | } | |
1514 | ||
2dc49d16 ND |
1515 | static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr, |
1516 | const struct tcphdr *th) | |
1517 | { | |
1518 | /* This is tricky: we move IP6CB at its correct location into | |
1519 | * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because | |
1520 | * _decode_session6() uses IP6CB(). | |
1521 | * barrier() makes sure compiler won't play aliasing games. | |
1522 | */ | |
1523 | memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb), | |
1524 | sizeof(struct inet6_skb_parm)); | |
1525 | barrier(); | |
1526 | ||
1527 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1528 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1529 | skb->len - th->doff*4); | |
1530 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1531 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); | |
1532 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; | |
1533 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); | |
1534 | TCP_SKB_CB(skb)->sacked = 0; | |
98aaa913 MM |
1535 | TCP_SKB_CB(skb)->has_rxtstamp = |
1536 | skb->tstamp || skb_hwtstamps(skb)->hwtstamp; | |
2dc49d16 ND |
1537 | } |
1538 | ||
0e219ae4 | 1539 | INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1540 | { |
8b27dae5 | 1541 | struct sk_buff *skb_to_free; |
4297a0ef | 1542 | int sdif = inet6_sdif(skb); |
d14c77e0 | 1543 | int dif = inet6_iif(skb); |
cf533ea5 | 1544 | const struct tcphdr *th; |
b71d1d42 | 1545 | const struct ipv6hdr *hdr; |
3b24d854 | 1546 | bool refcounted; |
1da177e4 LT |
1547 | struct sock *sk; |
1548 | int ret; | |
a86b1e30 | 1549 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1550 | |
1551 | if (skb->pkt_type != PACKET_HOST) | |
1552 | goto discard_it; | |
1553 | ||
1554 | /* | |
1555 | * Count it even if it's bad. | |
1556 | */ | |
90bbcc60 | 1557 | __TCP_INC_STATS(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1558 | |
1559 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1560 | goto discard_it; | |
1561 | ||
ea1627c2 | 1562 | th = (const struct tcphdr *)skb->data; |
1da177e4 | 1563 | |
ea1627c2 | 1564 | if (unlikely(th->doff < sizeof(struct tcphdr)/4)) |
1da177e4 LT |
1565 | goto bad_packet; |
1566 | if (!pskb_may_pull(skb, th->doff*4)) | |
1567 | goto discard_it; | |
1568 | ||
e4f45b7f | 1569 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
6a5dc9e5 | 1570 | goto csum_error; |
1da177e4 | 1571 | |
ea1627c2 | 1572 | th = (const struct tcphdr *)skb->data; |
e802af9c | 1573 | hdr = ipv6_hdr(skb); |
1da177e4 | 1574 | |
4bdc3d66 | 1575 | lookup: |
a583636a | 1576 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, __tcp_hdrlen(th), |
4297a0ef | 1577 | th->source, th->dest, inet6_iif(skb), sdif, |
3b24d854 | 1578 | &refcounted); |
1da177e4 LT |
1579 | if (!sk) |
1580 | goto no_tcp_socket; | |
1581 | ||
1582 | process: | |
1583 | if (sk->sk_state == TCP_TIME_WAIT) | |
1584 | goto do_time_wait; | |
1585 | ||
079096f1 ED |
1586 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
1587 | struct request_sock *req = inet_reqsk(sk); | |
e0f9759f | 1588 | bool req_stolen = false; |
7716682c | 1589 | struct sock *nsk; |
079096f1 ED |
1590 | |
1591 | sk = req->rsk_listener; | |
d14c77e0 | 1592 | if (tcp_v6_inbound_md5_hash(sk, skb, dif, sdif)) { |
e65c332d | 1593 | sk_drops_add(sk, skb); |
079096f1 ED |
1594 | reqsk_put(req); |
1595 | goto discard_it; | |
1596 | } | |
4fd44a98 FL |
1597 | if (tcp_checksum_complete(skb)) { |
1598 | reqsk_put(req); | |
1599 | goto csum_error; | |
1600 | } | |
7716682c | 1601 | if (unlikely(sk->sk_state != TCP_LISTEN)) { |
f03f2e15 | 1602 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
4bdc3d66 ED |
1603 | goto lookup; |
1604 | } | |
7716682c | 1605 | sock_hold(sk); |
3b24d854 | 1606 | refcounted = true; |
1f3b359f | 1607 | nsk = NULL; |
eeea10b8 ED |
1608 | if (!tcp_filter(sk, skb)) { |
1609 | th = (const struct tcphdr *)skb->data; | |
1610 | hdr = ipv6_hdr(skb); | |
1611 | tcp_v6_fill_cb(skb, hdr, th); | |
e0f9759f | 1612 | nsk = tcp_check_req(sk, skb, req, false, &req_stolen); |
eeea10b8 | 1613 | } |
079096f1 ED |
1614 | if (!nsk) { |
1615 | reqsk_put(req); | |
e0f9759f ED |
1616 | if (req_stolen) { |
1617 | /* Another cpu got exclusive access to req | |
1618 | * and created a full blown socket. | |
1619 | * Try to feed this packet to this socket | |
1620 | * instead of discarding it. | |
1621 | */ | |
1622 | tcp_v6_restore_cb(skb); | |
1623 | sock_put(sk); | |
1624 | goto lookup; | |
1625 | } | |
7716682c | 1626 | goto discard_and_relse; |
079096f1 ED |
1627 | } |
1628 | if (nsk == sk) { | |
079096f1 ED |
1629 | reqsk_put(req); |
1630 | tcp_v6_restore_cb(skb); | |
1631 | } else if (tcp_child_process(sk, nsk, skb)) { | |
1632 | tcp_v6_send_reset(nsk, skb); | |
7716682c | 1633 | goto discard_and_relse; |
079096f1 | 1634 | } else { |
7716682c | 1635 | sock_put(sk); |
079096f1 ED |
1636 | return 0; |
1637 | } | |
1638 | } | |
93a77c11 | 1639 | if (hdr->hop_limit < tcp_inet6_sk(sk)->min_hopcount) { |
02a1d6e7 | 1640 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
e802af9c SH |
1641 | goto discard_and_relse; |
1642 | } | |
1643 | ||
1da177e4 LT |
1644 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1645 | goto discard_and_relse; | |
1646 | ||
d14c77e0 | 1647 | if (tcp_v6_inbound_md5_hash(sk, skb, dif, sdif)) |
9ea88a15 | 1648 | goto discard_and_relse; |
9ea88a15 | 1649 | |
ac6e7800 | 1650 | if (tcp_filter(sk, skb)) |
1da177e4 | 1651 | goto discard_and_relse; |
ac6e7800 ED |
1652 | th = (const struct tcphdr *)skb->data; |
1653 | hdr = ipv6_hdr(skb); | |
eeea10b8 | 1654 | tcp_v6_fill_cb(skb, hdr, th); |
1da177e4 LT |
1655 | |
1656 | skb->dev = NULL; | |
1657 | ||
e994b2f0 ED |
1658 | if (sk->sk_state == TCP_LISTEN) { |
1659 | ret = tcp_v6_do_rcv(sk, skb); | |
1660 | goto put_and_return; | |
1661 | } | |
1662 | ||
1663 | sk_incoming_cpu_update(sk); | |
1664 | ||
293b9c42 | 1665 | bh_lock_sock_nested(sk); |
a44d6eac | 1666 | tcp_segs_in(tcp_sk(sk), skb); |
1da177e4 LT |
1667 | ret = 0; |
1668 | if (!sock_owned_by_user(sk)) { | |
8b27dae5 ED |
1669 | skb_to_free = sk->sk_rx_skb_cache; |
1670 | sk->sk_rx_skb_cache = NULL; | |
e7942d06 | 1671 | ret = tcp_v6_do_rcv(sk, skb); |
8b27dae5 ED |
1672 | } else { |
1673 | if (tcp_add_backlog(sk, skb)) | |
1674 | goto discard_and_relse; | |
1675 | skb_to_free = NULL; | |
6b03a53a | 1676 | } |
1da177e4 | 1677 | bh_unlock_sock(sk); |
8b27dae5 ED |
1678 | if (skb_to_free) |
1679 | __kfree_skb(skb_to_free); | |
e994b2f0 | 1680 | put_and_return: |
3b24d854 ED |
1681 | if (refcounted) |
1682 | sock_put(sk); | |
1da177e4 LT |
1683 | return ret ? -1 : 0; |
1684 | ||
1685 | no_tcp_socket: | |
1686 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1687 | goto discard_it; | |
1688 | ||
2dc49d16 ND |
1689 | tcp_v6_fill_cb(skb, hdr, th); |
1690 | ||
12e25e10 | 1691 | if (tcp_checksum_complete(skb)) { |
6a5dc9e5 | 1692 | csum_error: |
90bbcc60 | 1693 | __TCP_INC_STATS(net, TCP_MIB_CSUMERRORS); |
1da177e4 | 1694 | bad_packet: |
90bbcc60 | 1695 | __TCP_INC_STATS(net, TCP_MIB_INERRS); |
1da177e4 | 1696 | } else { |
cfb6eeb4 | 1697 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1698 | } |
1699 | ||
1700 | discard_it: | |
1da177e4 LT |
1701 | kfree_skb(skb); |
1702 | return 0; | |
1703 | ||
1704 | discard_and_relse: | |
532182cd | 1705 | sk_drops_add(sk, skb); |
3b24d854 ED |
1706 | if (refcounted) |
1707 | sock_put(sk); | |
1da177e4 LT |
1708 | goto discard_it; |
1709 | ||
1710 | do_time_wait: | |
1711 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1712 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1713 | goto discard_it; |
1714 | } | |
1715 | ||
2dc49d16 ND |
1716 | tcp_v6_fill_cb(skb, hdr, th); |
1717 | ||
6a5dc9e5 ED |
1718 | if (tcp_checksum_complete(skb)) { |
1719 | inet_twsk_put(inet_twsk(sk)); | |
1720 | goto csum_error; | |
1da177e4 LT |
1721 | } |
1722 | ||
9469c7b4 | 1723 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1724 | case TCP_TW_SYN: |
1725 | { | |
1726 | struct sock *sk2; | |
1727 | ||
c346dca1 | 1728 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
a583636a | 1729 | skb, __tcp_hdrlen(th), |
5ba24953 | 1730 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1731 | &ipv6_hdr(skb)->daddr, |
24b711ed DA |
1732 | ntohs(th->dest), |
1733 | tcp_v6_iif_l3_slave(skb), | |
4297a0ef | 1734 | sdif); |
53b24b8f | 1735 | if (sk2) { |
295ff7ed | 1736 | struct inet_timewait_sock *tw = inet_twsk(sk); |
dbe7faa4 | 1737 | inet_twsk_deschedule_put(tw); |
1da177e4 | 1738 | sk = sk2; |
4ad19de8 | 1739 | tcp_v6_restore_cb(skb); |
3b24d854 | 1740 | refcounted = false; |
1da177e4 LT |
1741 | goto process; |
1742 | } | |
1da177e4 | 1743 | } |
275757e6 | 1744 | /* to ACK */ |
a8eceea8 | 1745 | fallthrough; |
1da177e4 LT |
1746 | case TCP_TW_ACK: |
1747 | tcp_v6_timewait_ack(sk, skb); | |
1748 | break; | |
1749 | case TCP_TW_RST: | |
271c3b9b FW |
1750 | tcp_v6_send_reset(sk, skb); |
1751 | inet_twsk_deschedule_put(inet_twsk(sk)); | |
1752 | goto discard_it; | |
4aa956d8 WY |
1753 | case TCP_TW_SUCCESS: |
1754 | ; | |
1da177e4 LT |
1755 | } |
1756 | goto discard_it; | |
1757 | } | |
1758 | ||
97ff7ffb | 1759 | INDIRECT_CALLABLE_SCOPE void tcp_v6_early_demux(struct sk_buff *skb) |
c7109986 ED |
1760 | { |
1761 | const struct ipv6hdr *hdr; | |
1762 | const struct tcphdr *th; | |
1763 | struct sock *sk; | |
1764 | ||
1765 | if (skb->pkt_type != PACKET_HOST) | |
1766 | return; | |
1767 | ||
1768 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1769 | return; | |
1770 | ||
1771 | hdr = ipv6_hdr(skb); | |
1772 | th = tcp_hdr(skb); | |
1773 | ||
1774 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1775 | return; | |
1776 | ||
870c3151 | 1777 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
c7109986 ED |
1778 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
1779 | &hdr->saddr, th->source, | |
1780 | &hdr->daddr, ntohs(th->dest), | |
4297a0ef | 1781 | inet6_iif(skb), inet6_sdif(skb)); |
c7109986 ED |
1782 | if (sk) { |
1783 | skb->sk = sk; | |
1784 | skb->destructor = sock_edemux; | |
f7e4eb03 | 1785 | if (sk_fullsock(sk)) { |
d0c294c5 | 1786 | struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst); |
f3f12135 | 1787 | |
c7109986 | 1788 | if (dst) |
93a77c11 | 1789 | dst = dst_check(dst, tcp_inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1790 | if (dst && |
f3f12135 | 1791 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1792 | skb_dst_set_noref(skb, dst); |
1793 | } | |
1794 | } | |
1795 | } | |
1796 | ||
ccb7c410 DM |
1797 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1798 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1799 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 1800 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
1801 | }; |
1802 | ||
35b2c321 | 1803 | const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1804 | .queue_xmit = inet6_csk_xmit, |
1805 | .send_check = tcp_v6_send_check, | |
1806 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1807 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1808 | .conn_request = tcp_v6_conn_request, |
1809 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1810 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1811 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1812 | .setsockopt = ipv6_setsockopt, |
1813 | .getsockopt = ipv6_getsockopt, | |
1814 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1815 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1816 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1817 | .compat_setsockopt = compat_ipv6_setsockopt, |
1818 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1819 | #endif |
4fab9071 | 1820 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 LT |
1821 | }; |
1822 | ||
cfb6eeb4 | 1823 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1824 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1825 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1826 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1827 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1828 | }; |
a928630a | 1829 | #endif |
cfb6eeb4 | 1830 | |
1da177e4 LT |
1831 | /* |
1832 | * TCP over IPv4 via INET6 API | |
1833 | */ | |
3b401a81 | 1834 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1835 | .queue_xmit = ip_queue_xmit, |
1836 | .send_check = tcp_v4_send_check, | |
1837 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1838 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1839 | .conn_request = tcp_v6_conn_request, |
1840 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1841 | .net_header_len = sizeof(struct iphdr), |
1842 | .setsockopt = ipv6_setsockopt, | |
1843 | .getsockopt = ipv6_getsockopt, | |
1844 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1845 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1846 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1847 | .compat_setsockopt = compat_ipv6_setsockopt, |
1848 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1849 | #endif |
4fab9071 | 1850 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 LT |
1851 | }; |
1852 | ||
cfb6eeb4 | 1853 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1854 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1855 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1856 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1857 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1858 | }; |
a928630a | 1859 | #endif |
cfb6eeb4 | 1860 | |
1da177e4 LT |
1861 | /* NOTE: A lot of things set to zero explicitly by call to |
1862 | * sk_alloc() so need not be done here. | |
1863 | */ | |
1864 | static int tcp_v6_init_sock(struct sock *sk) | |
1865 | { | |
6687e988 | 1866 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1867 | |
900f65d3 | 1868 | tcp_init_sock(sk); |
1da177e4 | 1869 | |
8292a17a | 1870 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1871 | |
cfb6eeb4 | 1872 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1873 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1874 | #endif |
1875 | ||
1da177e4 LT |
1876 | return 0; |
1877 | } | |
1878 | ||
7d06b2e0 | 1879 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1880 | { |
1da177e4 | 1881 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1882 | inet6_destroy_sock(sk); |
1da177e4 LT |
1883 | } |
1884 | ||
952a10be | 1885 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1886 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1887 | static void get_openreq6(struct seq_file *seq, |
aa3a0c8c | 1888 | const struct request_sock *req, int i) |
1da177e4 | 1889 | { |
fa76ce73 | 1890 | long ttd = req->rsk_timer.expires - jiffies; |
634fb979 ED |
1891 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1892 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1893 | |
1894 | if (ttd < 0) | |
1895 | ttd = 0; | |
1896 | ||
1da177e4 LT |
1897 | seq_printf(seq, |
1898 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1899 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1900 | i, |
1901 | src->s6_addr32[0], src->s6_addr32[1], | |
1902 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1903 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1904 | dest->s6_addr32[0], dest->s6_addr32[1], |
1905 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1906 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 1907 | TCP_SYN_RECV, |
4c99aa40 | 1908 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
1909 | 1, /* timers active (only the expire timer) */ |
1910 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1911 | req->num_timeout, |
aa3a0c8c ED |
1912 | from_kuid_munged(seq_user_ns(seq), |
1913 | sock_i_uid(req->rsk_listener)), | |
1ab1457c | 1914 | 0, /* non standard timer */ |
1da177e4 LT |
1915 | 0, /* open_requests have no inode */ |
1916 | 0, req); | |
1917 | } | |
1918 | ||
1919 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1920 | { | |
b71d1d42 | 1921 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1922 | __u16 destp, srcp; |
1923 | int timer_active; | |
1924 | unsigned long timer_expires; | |
cf533ea5 ED |
1925 | const struct inet_sock *inet = inet_sk(sp); |
1926 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1927 | const struct inet_connection_sock *icsk = inet_csk(sp); |
0536fcc0 | 1928 | const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq; |
00fd38d9 ED |
1929 | int rx_queue; |
1930 | int state; | |
1da177e4 | 1931 | |
efe4208f ED |
1932 | dest = &sp->sk_v6_daddr; |
1933 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1934 | destp = ntohs(inet->inet_dport); |
1935 | srcp = ntohs(inet->inet_sport); | |
463c84b9 | 1936 | |
ce3cf4ec | 1937 | if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
57dde7f7 | 1938 | icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT || |
ce3cf4ec | 1939 | icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { |
1da177e4 | 1940 | timer_active = 1; |
463c84b9 ACM |
1941 | timer_expires = icsk->icsk_timeout; |
1942 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1943 | timer_active = 4; |
463c84b9 | 1944 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1945 | } else if (timer_pending(&sp->sk_timer)) { |
1946 | timer_active = 2; | |
1947 | timer_expires = sp->sk_timer.expires; | |
1948 | } else { | |
1949 | timer_active = 0; | |
1950 | timer_expires = jiffies; | |
1951 | } | |
1952 | ||
986ffdfd | 1953 | state = inet_sk_state_load(sp); |
00fd38d9 | 1954 | if (state == TCP_LISTEN) |
288efe86 | 1955 | rx_queue = READ_ONCE(sp->sk_ack_backlog); |
00fd38d9 ED |
1956 | else |
1957 | /* Because we don't lock the socket, | |
1958 | * we might find a transient negative value. | |
1959 | */ | |
dba7d9b8 | 1960 | rx_queue = max_t(int, READ_ONCE(tp->rcv_nxt) - |
7db48e98 | 1961 | READ_ONCE(tp->copied_seq), 0); |
00fd38d9 | 1962 | |
1da177e4 LT |
1963 | seq_printf(seq, |
1964 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1965 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1966 | i, |
1967 | src->s6_addr32[0], src->s6_addr32[1], | |
1968 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1969 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1970 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
00fd38d9 | 1971 | state, |
0f317464 | 1972 | READ_ONCE(tp->write_seq) - tp->snd_una, |
00fd38d9 | 1973 | rx_queue, |
1da177e4 | 1974 | timer_active, |
a399a805 | 1975 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1976 | icsk->icsk_retransmits, |
a7cb5a49 | 1977 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1978 | icsk->icsk_probes_out, |
1da177e4 | 1979 | sock_i_ino(sp), |
41c6d650 | 1980 | refcount_read(&sp->sk_refcnt), sp, |
7be87351 SH |
1981 | jiffies_to_clock_t(icsk->icsk_rto), |
1982 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
31954cd8 | 1983 | (icsk->icsk_ack.quick << 1) | inet_csk_in_pingpong_mode(sp), |
0b6a05c1 | 1984 | tp->snd_cwnd, |
00fd38d9 | 1985 | state == TCP_LISTEN ? |
0536fcc0 | 1986 | fastopenq->max_qlen : |
0a672f74 | 1987 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) |
1da177e4 LT |
1988 | ); |
1989 | } | |
1990 | ||
1ab1457c | 1991 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1992 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1993 | { |
789f558c | 1994 | long delta = tw->tw_timer.expires - jiffies; |
b71d1d42 | 1995 | const struct in6_addr *dest, *src; |
1da177e4 | 1996 | __u16 destp, srcp; |
1da177e4 | 1997 | |
efe4208f ED |
1998 | dest = &tw->tw_v6_daddr; |
1999 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
2000 | destp = ntohs(tw->tw_dport); |
2001 | srcp = ntohs(tw->tw_sport); | |
2002 | ||
2003 | seq_printf(seq, | |
2004 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 2005 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
2006 | i, |
2007 | src->s6_addr32[0], src->s6_addr32[1], | |
2008 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2009 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2010 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2011 | tw->tw_substate, 0, 0, | |
a399a805 | 2012 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
41c6d650 | 2013 | refcount_read(&tw->tw_refcnt), tw); |
1da177e4 LT |
2014 | } |
2015 | ||
1da177e4 LT |
2016 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
2017 | { | |
2018 | struct tcp_iter_state *st; | |
05dbc7b5 | 2019 | struct sock *sk = v; |
1da177e4 LT |
2020 | |
2021 | if (v == SEQ_START_TOKEN) { | |
2022 | seq_puts(seq, | |
2023 | " sl " | |
2024 | "local_address " | |
2025 | "remote_address " | |
2026 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2027 | " uid timeout inode\n"); | |
2028 | goto out; | |
2029 | } | |
2030 | st = seq->private; | |
2031 | ||
079096f1 ED |
2032 | if (sk->sk_state == TCP_TIME_WAIT) |
2033 | get_timewait6_sock(seq, v, st->num); | |
2034 | else if (sk->sk_state == TCP_NEW_SYN_RECV) | |
aa3a0c8c | 2035 | get_openreq6(seq, v, st->num); |
079096f1 ED |
2036 | else |
2037 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
2038 | out: |
2039 | return 0; | |
2040 | } | |
2041 | ||
37d849bb CH |
2042 | static const struct seq_operations tcp6_seq_ops = { |
2043 | .show = tcp6_seq_show, | |
2044 | .start = tcp_seq_start, | |
2045 | .next = tcp_seq_next, | |
2046 | .stop = tcp_seq_stop, | |
2047 | }; | |
2048 | ||
1da177e4 | 2049 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 | 2050 | .family = AF_INET6, |
1da177e4 LT |
2051 | }; |
2052 | ||
2c8c1e72 | 2053 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 2054 | { |
c3506372 CH |
2055 | if (!proc_create_net_data("tcp6", 0444, net->proc_net, &tcp6_seq_ops, |
2056 | sizeof(struct tcp_iter_state), &tcp6_seq_afinfo)) | |
37d849bb CH |
2057 | return -ENOMEM; |
2058 | return 0; | |
1da177e4 LT |
2059 | } |
2060 | ||
6f8b13bc | 2061 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2062 | { |
37d849bb | 2063 | remove_proc_entry("tcp6", net->proc_net); |
1da177e4 LT |
2064 | } |
2065 | #endif | |
2066 | ||
2067 | struct proto tcpv6_prot = { | |
2068 | .name = "TCPv6", | |
2069 | .owner = THIS_MODULE, | |
2070 | .close = tcp_close, | |
d74bad4e | 2071 | .pre_connect = tcp_v6_pre_connect, |
1da177e4 LT |
2072 | .connect = tcp_v6_connect, |
2073 | .disconnect = tcp_disconnect, | |
463c84b9 | 2074 | .accept = inet_csk_accept, |
1da177e4 LT |
2075 | .ioctl = tcp_ioctl, |
2076 | .init = tcp_v6_init_sock, | |
2077 | .destroy = tcp_v6_destroy_sock, | |
2078 | .shutdown = tcp_shutdown, | |
2079 | .setsockopt = tcp_setsockopt, | |
2080 | .getsockopt = tcp_getsockopt, | |
4b9d07a4 | 2081 | .keepalive = tcp_set_keepalive, |
1da177e4 | 2082 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
2083 | .sendmsg = tcp_sendmsg, |
2084 | .sendpage = tcp_sendpage, | |
1da177e4 | 2085 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 2086 | .release_cb = tcp_release_cb, |
496611d7 | 2087 | .hash = inet6_hash, |
ab1e0a13 ACM |
2088 | .unhash = inet_unhash, |
2089 | .get_port = inet_csk_get_port, | |
1da177e4 | 2090 | .enter_memory_pressure = tcp_enter_memory_pressure, |
06044751 | 2091 | .leave_memory_pressure = tcp_leave_memory_pressure, |
c9bee3b7 | 2092 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
2093 | .sockets_allocated = &tcp_sockets_allocated, |
2094 | .memory_allocated = &tcp_memory_allocated, | |
2095 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2096 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 2097 | .sysctl_mem = sysctl_tcp_mem, |
356d1833 ED |
2098 | .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem), |
2099 | .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_tcp_rmem), | |
1da177e4 LT |
2100 | .max_header = MAX_TCP_HEADER, |
2101 | .obj_size = sizeof(struct tcp6_sock), | |
5f0d5a3a | 2102 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
6d6ee43e | 2103 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2104 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2105 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 2106 | .no_autobind = true, |
543d9cfe ACM |
2107 | #ifdef CONFIG_COMPAT |
2108 | .compat_setsockopt = compat_tcp_setsockopt, | |
2109 | .compat_getsockopt = compat_tcp_getsockopt, | |
d1a4c0b3 | 2110 | #endif |
c1e64e29 | 2111 | .diag_destroy = tcp_abort, |
1da177e4 LT |
2112 | }; |
2113 | ||
a8e3bb34 DA |
2114 | /* thinking of making this const? Don't. |
2115 | * early_demux can change based on sysctl. | |
2116 | */ | |
39294c3d | 2117 | static struct inet6_protocol tcpv6_protocol = { |
c7109986 | 2118 | .early_demux = tcp_v6_early_demux, |
dddb64bc | 2119 | .early_demux_handler = tcp_v6_early_demux, |
1da177e4 LT |
2120 | .handler = tcp_v6_rcv, |
2121 | .err_handler = tcp_v6_err, | |
2122 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
2123 | }; | |
2124 | ||
1da177e4 LT |
2125 | static struct inet_protosw tcpv6_protosw = { |
2126 | .type = SOCK_STREAM, | |
2127 | .protocol = IPPROTO_TCP, | |
2128 | .prot = &tcpv6_prot, | |
2129 | .ops = &inet6_stream_ops, | |
d83d8461 ACM |
2130 | .flags = INET_PROTOSW_PERMANENT | |
2131 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2132 | }; |
2133 | ||
2c8c1e72 | 2134 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 2135 | { |
5677242f DL |
2136 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2137 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2138 | } |
2139 | ||
2c8c1e72 | 2140 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 2141 | { |
5677242f | 2142 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
2143 | } |
2144 | ||
2c8c1e72 | 2145 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 | 2146 | { |
1946e672 | 2147 | inet_twsk_purge(&tcp_hashinfo, AF_INET6); |
93ec926b DL |
2148 | } |
2149 | ||
2150 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
2151 | .init = tcpv6_net_init, |
2152 | .exit = tcpv6_net_exit, | |
2153 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
2154 | }; |
2155 | ||
7f4e4868 | 2156 | int __init tcpv6_init(void) |
1da177e4 | 2157 | { |
7f4e4868 DL |
2158 | int ret; |
2159 | ||
3336288a VY |
2160 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
2161 | if (ret) | |
c6b641a4 | 2162 | goto out; |
3336288a | 2163 | |
1da177e4 | 2164 | /* register inet6 protocol */ |
7f4e4868 DL |
2165 | ret = inet6_register_protosw(&tcpv6_protosw); |
2166 | if (ret) | |
2167 | goto out_tcpv6_protocol; | |
2168 | ||
93ec926b | 2169 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2170 | if (ret) |
2171 | goto out_tcpv6_protosw; | |
f870fa0b MM |
2172 | |
2173 | ret = mptcpv6_init(); | |
2174 | if (ret) | |
2175 | goto out_tcpv6_pernet_subsys; | |
2176 | ||
7f4e4868 DL |
2177 | out: |
2178 | return ret; | |
ae0f7d5f | 2179 | |
f870fa0b MM |
2180 | out_tcpv6_pernet_subsys: |
2181 | unregister_pernet_subsys(&tcpv6_net_ops); | |
7f4e4868 DL |
2182 | out_tcpv6_protosw: |
2183 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
2184 | out_tcpv6_protocol: |
2185 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
2186 | goto out; |
2187 | } | |
2188 | ||
09f7709f | 2189 | void tcpv6_exit(void) |
7f4e4868 | 2190 | { |
93ec926b | 2191 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2192 | inet6_unregister_protosw(&tcpv6_protosw); |
2193 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2194 | } |