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 | 74 | |
d2489c7b | 75 | INDIRECT_CALLABLE_SCOPE 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 | ||
8f905c0e | 110 | rcu_assign_pointer(sk->sk_rx_dst, dst); |
0c0a5ef8 | 111 | sk->sk_rx_dst_ifindex = skb->skb_iif; |
ef57c161 | 112 | 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); |
fbb82952 | 151 | struct inet_timewait_death_row *tcp_death_row; |
93a77c11 | 152 | struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
1da177e4 | 153 | struct tcp_sock *tp = tcp_sk(sk); |
20c59de2 | 154 | struct in6_addr *saddr = NULL, *final_p, final; |
45f6fad8 | 155 | struct ipv6_txoptions *opt; |
4c9483b2 | 156 | struct flowi6 fl6; |
1da177e4 LT |
157 | struct dst_entry *dst; |
158 | int addr_type; | |
159 | int err; | |
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 | |
3df98d79 | 281 | security_sk_classify_flow(sk, flowi6_to_flowi_common(&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); | |
fbb82952 | 311 | tcp_death_row = sock_net(sk)->ipv4.tcp_death_row; |
1946e672 | 312 | err = inet6_hash_connect(tcp_death_row, sk); |
1da177e4 LT |
313 | if (err) |
314 | goto late_failure; | |
315 | ||
877d1f62 | 316 | sk_set_txhash(sk); |
9e7ceb06 | 317 | |
00355fa5 | 318 | if (likely(!tp->repair)) { |
00355fa5 | 319 | if (!tp->write_seq) |
0f317464 ED |
320 | WRITE_ONCE(tp->write_seq, |
321 | secure_tcpv6_seq(np->saddr.s6_addr32, | |
322 | sk->sk_v6_daddr.s6_addr32, | |
323 | inet->inet_sport, | |
324 | inet->inet_dport)); | |
5d2ed052 ED |
325 | tp->tsoffset = secure_tcpv6_ts_off(sock_net(sk), |
326 | np->saddr.s6_addr32, | |
84b114b9 | 327 | sk->sk_v6_daddr.s6_addr32); |
00355fa5 | 328 | } |
1da177e4 | 329 | |
19f6d3f3 WW |
330 | if (tcp_fastopen_defer_connect(sk, &err)) |
331 | return err; | |
332 | if (err) | |
333 | goto late_failure; | |
334 | ||
1da177e4 LT |
335 | err = tcp_connect(sk); |
336 | if (err) | |
337 | goto late_failure; | |
338 | ||
339 | return 0; | |
340 | ||
341 | late_failure: | |
342 | tcp_set_state(sk, TCP_CLOSE); | |
1da177e4 | 343 | failure: |
c720c7e8 | 344 | inet->inet_dport = 0; |
1da177e4 LT |
345 | sk->sk_route_caps = 0; |
346 | return err; | |
347 | } | |
348 | ||
563d34d0 ED |
349 | static void tcp_v6_mtu_reduced(struct sock *sk) |
350 | { | |
351 | struct dst_entry *dst; | |
c7bb4b89 | 352 | u32 mtu; |
563d34d0 ED |
353 | |
354 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
355 | return; | |
356 | ||
c7bb4b89 ED |
357 | mtu = READ_ONCE(tcp_sk(sk)->mtu_info); |
358 | ||
359 | /* Drop requests trying to increase our current mss. | |
360 | * Check done in __ip6_rt_update_pmtu() is too late. | |
361 | */ | |
362 | if (tcp_mtu_to_mss(sk, mtu) >= tcp_sk(sk)->mss_cache) | |
363 | return; | |
364 | ||
365 | dst = inet6_csk_update_pmtu(sk, mtu); | |
563d34d0 ED |
366 | if (!dst) |
367 | return; | |
368 | ||
369 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
370 | tcp_sync_mss(sk, dst_mtu(dst)); | |
371 | tcp_simple_retransmit(sk); | |
372 | } | |
373 | } | |
374 | ||
32bbd879 | 375 | static int tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 376 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 377 | { |
4c99aa40 | 378 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
505cbfc5 | 379 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
2215089b ED |
380 | struct net *net = dev_net(skb->dev); |
381 | struct request_sock *fastopen; | |
1da177e4 | 382 | struct ipv6_pinfo *np; |
1ab1457c | 383 | struct tcp_sock *tp; |
0a672f74 | 384 | __u32 seq, snd_una; |
2215089b | 385 | struct sock *sk; |
9cf74903 | 386 | bool fatal; |
2215089b | 387 | int err; |
1da177e4 | 388 | |
2215089b ED |
389 | sk = __inet6_lookup_established(net, &tcp_hashinfo, |
390 | &hdr->daddr, th->dest, | |
391 | &hdr->saddr, ntohs(th->source), | |
4297a0ef | 392 | skb->dev->ifindex, inet6_sdif(skb)); |
1da177e4 | 393 | |
2215089b | 394 | if (!sk) { |
a16292a0 ED |
395 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
396 | ICMP6_MIB_INERRORS); | |
32bbd879 | 397 | return -ENOENT; |
1da177e4 LT |
398 | } |
399 | ||
400 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 401 | inet_twsk_put(inet_twsk(sk)); |
32bbd879 | 402 | return 0; |
1da177e4 | 403 | } |
2215089b | 404 | seq = ntohl(th->seq); |
9cf74903 | 405 | fatal = icmpv6_err_convert(type, code, &err); |
32bbd879 SB |
406 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
407 | tcp_req_err(sk, seq, fatal); | |
408 | return 0; | |
409 | } | |
1da177e4 LT |
410 | |
411 | bh_lock_sock(sk); | |
563d34d0 | 412 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
02a1d6e7 | 413 | __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
414 | |
415 | if (sk->sk_state == TCP_CLOSE) | |
416 | goto out; | |
417 | ||
790eb673 ED |
418 | if (static_branch_unlikely(&ip6_min_hopcount)) { |
419 | /* min_hopcount can be changed concurrently from do_ipv6_setsockopt() */ | |
420 | if (ipv6_hdr(skb)->hop_limit < READ_ONCE(tcp_inet6_sk(sk)->min_hopcount)) { | |
421 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); | |
422 | goto out; | |
423 | } | |
e802af9c SH |
424 | } |
425 | ||
1da177e4 | 426 | tp = tcp_sk(sk); |
0a672f74 | 427 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
d983ea6f | 428 | fastopen = rcu_dereference(tp->fastopen_rsk); |
0a672f74 | 429 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; |
1da177e4 | 430 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 431 | !between(seq, snd_una, tp->snd_nxt)) { |
02a1d6e7 | 432 | __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
433 | goto out; |
434 | } | |
435 | ||
93a77c11 | 436 | np = tcp_inet6_sk(sk); |
1da177e4 | 437 | |
ec18d9a2 | 438 | if (type == NDISC_REDIRECT) { |
45caeaa5 JM |
439 | if (!sock_owned_by_user(sk)) { |
440 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
ec18d9a2 | 441 | |
45caeaa5 JM |
442 | if (dst) |
443 | dst->ops->redirect(dst, sk, skb); | |
444 | } | |
50a75a89 | 445 | goto out; |
ec18d9a2 DM |
446 | } |
447 | ||
1da177e4 | 448 | if (type == ICMPV6_PKT_TOOBIG) { |
c7bb4b89 ED |
449 | u32 mtu = ntohl(info); |
450 | ||
0d4f0608 ED |
451 | /* We are not interested in TCP_LISTEN and open_requests |
452 | * (SYN-ACKs send out by Linux are always <576bytes so | |
453 | * they should go through unfragmented). | |
454 | */ | |
455 | if (sk->sk_state == TCP_LISTEN) | |
456 | goto out; | |
457 | ||
93b36cf3 HFS |
458 | if (!ip6_sk_accept_pmtu(sk)) |
459 | goto out; | |
460 | ||
c7bb4b89 ED |
461 | if (mtu < IPV6_MIN_MTU) |
462 | goto out; | |
463 | ||
464 | WRITE_ONCE(tp->mtu_info, mtu); | |
465 | ||
563d34d0 ED |
466 | if (!sock_owned_by_user(sk)) |
467 | tcp_v6_mtu_reduced(sk); | |
d013ef2a | 468 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
7aa5470c | 469 | &sk->sk_tsq_flags)) |
d013ef2a | 470 | sock_hold(sk); |
1da177e4 LT |
471 | goto out; |
472 | } | |
473 | ||
1da177e4 | 474 | |
60236fdd | 475 | /* Might be for an request_sock */ |
1da177e4 | 476 | switch (sk->sk_state) { |
1da177e4 | 477 | case TCP_SYN_SENT: |
0a672f74 YC |
478 | case TCP_SYN_RECV: |
479 | /* Only in fast or simultaneous open. If a fast open socket is | |
634a63e7 | 480 | * already accepted it is treated as a connected one below. |
0a672f74 | 481 | */ |
63159f29 | 482 | if (fastopen && !fastopen->sk) |
0a672f74 YC |
483 | break; |
484 | ||
45af29ca ED |
485 | ipv6_icmp_error(sk, skb, err, th->dest, ntohl(info), (u8 *)th); |
486 | ||
1da177e4 | 487 | if (!sock_owned_by_user(sk)) { |
1da177e4 | 488 | sk->sk_err = err; |
e3ae2365 | 489 | sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ |
1da177e4 LT |
490 | |
491 | tcp_done(sk); | |
492 | } else | |
493 | sk->sk_err_soft = err; | |
494 | goto out; | |
d2924569 ED |
495 | case TCP_LISTEN: |
496 | break; | |
497 | default: | |
498 | /* check if this ICMP message allows revert of backoff. | |
499 | * (see RFC 6069) | |
500 | */ | |
501 | if (!fastopen && type == ICMPV6_DEST_UNREACH && | |
502 | code == ICMPV6_NOROUTE) | |
503 | tcp_ld_RTO_revert(sk, seq); | |
1da177e4 LT |
504 | } |
505 | ||
506 | if (!sock_owned_by_user(sk) && np->recverr) { | |
507 | sk->sk_err = err; | |
e3ae2365 | 508 | sk_error_report(sk); |
1da177e4 LT |
509 | } else |
510 | sk->sk_err_soft = err; | |
511 | ||
512 | out: | |
513 | bh_unlock_sock(sk); | |
514 | sock_put(sk); | |
32bbd879 | 515 | return 0; |
1da177e4 LT |
516 | } |
517 | ||
518 | ||
0f935dbe | 519 | static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst, |
d6274bd8 | 520 | struct flowi *fl, |
3840a06e | 521 | struct request_sock *req, |
ca6fb065 | 522 | struct tcp_fastopen_cookie *foc, |
331fca43 MKL |
523 | enum tcp_synack_type synack_type, |
524 | struct sk_buff *syn_skb) | |
1da177e4 | 525 | { |
634fb979 | 526 | struct inet_request_sock *ireq = inet_rsk(req); |
93a77c11 | 527 | struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
56ac42bc | 528 | struct ipv6_txoptions *opt; |
d6274bd8 | 529 | struct flowi6 *fl6 = &fl->u.ip6; |
4c99aa40 | 530 | struct sk_buff *skb; |
9494218f | 531 | int err = -ENOMEM; |
ac8f1710 | 532 | u8 tclass; |
1da177e4 | 533 | |
9f10d3f6 | 534 | /* First, grab a route. */ |
f76b33c3 ED |
535 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req, |
536 | IPPROTO_TCP)) == NULL) | |
fd80eb94 | 537 | goto done; |
9494218f | 538 | |
331fca43 | 539 | skb = tcp_make_synack(sk, dst, req, foc, synack_type, syn_skb); |
9494218f | 540 | |
1da177e4 | 541 | if (skb) { |
634fb979 ED |
542 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
543 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 544 | |
634fb979 | 545 | fl6->daddr = ireq->ir_v6_rmt_addr; |
53b24b8f | 546 | if (np->repflow && ireq->pktopts) |
df3687ff FF |
547 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); |
548 | ||
ac8f1710 | 549 | tclass = sock_net(sk)->ipv4.sysctl_tcp_reflect_tos ? |
8ef44b6f WW |
550 | (tcp_rsk(req)->syn_tos & ~INET_ECN_MASK) | |
551 | (np->tclass & INET_ECN_MASK) : | |
861602b5 | 552 | np->tclass; |
407c85c7 AD |
553 | |
554 | if (!INET_ECN_is_capable(tclass) && | |
555 | tcp_bpf_ca_needs_ecn((struct sock *)req)) | |
556 | tclass |= INET_ECN_ECT_0; | |
557 | ||
558 | rcu_read_lock(); | |
559 | opt = ireq->ipv6_opt; | |
56ac42bc HD |
560 | if (!opt) |
561 | opt = rcu_dereference(np->opt); | |
43b90bfa | 562 | err = ip6_xmit(sk, skb, fl6, skb->mark ? : sk->sk_mark, opt, |
861602b5 | 563 | tclass, sk->sk_priority); |
3e4006f0 | 564 | rcu_read_unlock(); |
b9df3cb8 | 565 | err = net_xmit_eval(err); |
1da177e4 LT |
566 | } |
567 | ||
568 | done: | |
1da177e4 LT |
569 | return err; |
570 | } | |
571 | ||
72659ecc | 572 | |
60236fdd | 573 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 574 | { |
56ac42bc | 575 | kfree(inet_rsk(req)->ipv6_opt); |
12c8691d | 576 | consume_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
577 | } |
578 | ||
cfb6eeb4 | 579 | #ifdef CONFIG_TCP_MD5SIG |
b83e3deb | 580 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk, |
dea53bb8 DA |
581 | const struct in6_addr *addr, |
582 | int l3index) | |
cfb6eeb4 | 583 | { |
dea53bb8 DA |
584 | return tcp_md5_do_lookup(sk, l3index, |
585 | (union tcp_md5_addr *)addr, AF_INET6); | |
cfb6eeb4 YH |
586 | } |
587 | ||
b83e3deb | 588 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk, |
fd3a154a | 589 | const struct sock *addr_sk) |
cfb6eeb4 | 590 | { |
dea53bb8 DA |
591 | int l3index; |
592 | ||
593 | l3index = l3mdev_master_ifindex_by_index(sock_net(sk), | |
594 | addr_sk->sk_bound_dev_if); | |
595 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr, | |
596 | l3index); | |
cfb6eeb4 YH |
597 | } |
598 | ||
8917a777 | 599 | static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, |
d4c19c49 | 600 | sockptr_t optval, int optlen) |
cfb6eeb4 YH |
601 | { |
602 | struct tcp_md5sig cmd; | |
603 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
dea53bb8 | 604 | int l3index = 0; |
8917a777 | 605 | u8 prefixlen; |
a76c2315 | 606 | u8 flags; |
cfb6eeb4 YH |
607 | |
608 | if (optlen < sizeof(cmd)) | |
609 | return -EINVAL; | |
610 | ||
d4c19c49 | 611 | if (copy_from_sockptr(&cmd, optval, sizeof(cmd))) |
cfb6eeb4 YH |
612 | return -EFAULT; |
613 | ||
614 | if (sin6->sin6_family != AF_INET6) | |
615 | return -EINVAL; | |
616 | ||
a76c2315 LC |
617 | flags = cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX; |
618 | ||
8917a777 ID |
619 | if (optname == TCP_MD5SIG_EXT && |
620 | cmd.tcpm_flags & TCP_MD5SIG_FLAG_PREFIX) { | |
621 | prefixlen = cmd.tcpm_prefixlen; | |
622 | if (prefixlen > 128 || (ipv6_addr_v4mapped(&sin6->sin6_addr) && | |
623 | prefixlen > 32)) | |
624 | return -EINVAL; | |
625 | } else { | |
626 | prefixlen = ipv6_addr_v4mapped(&sin6->sin6_addr) ? 32 : 128; | |
627 | } | |
628 | ||
a76c2315 | 629 | if (optname == TCP_MD5SIG_EXT && cmd.tcpm_ifindex && |
6b102db5 DA |
630 | cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX) { |
631 | struct net_device *dev; | |
632 | ||
633 | rcu_read_lock(); | |
634 | dev = dev_get_by_index_rcu(sock_net(sk), cmd.tcpm_ifindex); | |
635 | if (dev && netif_is_l3_master(dev)) | |
636 | l3index = dev->ifindex; | |
637 | rcu_read_unlock(); | |
638 | ||
639 | /* ok to reference set/not set outside of rcu; | |
640 | * right now device MUST be an L3 master | |
641 | */ | |
642 | if (!dev || !l3index) | |
643 | return -EINVAL; | |
644 | } | |
645 | ||
cfb6eeb4 | 646 | if (!cmd.tcpm_keylen) { |
e773e4fa | 647 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b | 648 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
6b102db5 | 649 | AF_INET, prefixlen, |
a76c2315 | 650 | l3index, flags); |
a915da9b | 651 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
a76c2315 | 652 | AF_INET6, prefixlen, l3index, flags); |
cfb6eeb4 YH |
653 | } |
654 | ||
655 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
656 | return -EINVAL; | |
657 | ||
a915da9b ED |
658 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
659 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
a76c2315 | 660 | AF_INET, prefixlen, l3index, flags, |
dea53bb8 DA |
661 | cmd.tcpm_key, cmd.tcpm_keylen, |
662 | GFP_KERNEL); | |
cfb6eeb4 | 663 | |
a915da9b | 664 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
a76c2315 | 665 | AF_INET6, prefixlen, l3index, flags, |
dea53bb8 | 666 | cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
667 | } |
668 | ||
19689e38 ED |
669 | static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp, |
670 | const struct in6_addr *daddr, | |
671 | const struct in6_addr *saddr, | |
672 | const struct tcphdr *th, int nbytes) | |
cfb6eeb4 | 673 | { |
cfb6eeb4 | 674 | struct tcp6_pseudohdr *bp; |
49a72dfb | 675 | struct scatterlist sg; |
19689e38 | 676 | struct tcphdr *_th; |
8d26d76d | 677 | |
19689e38 | 678 | bp = hp->scratch; |
cfb6eeb4 | 679 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
680 | bp->saddr = *saddr; |
681 | bp->daddr = *daddr; | |
49a72dfb | 682 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 683 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 684 | |
19689e38 ED |
685 | _th = (struct tcphdr *)(bp + 1); |
686 | memcpy(_th, th, sizeof(*th)); | |
687 | _th->check = 0; | |
688 | ||
689 | sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th)); | |
690 | ahash_request_set_crypt(hp->md5_req, &sg, NULL, | |
691 | sizeof(*bp) + sizeof(*th)); | |
cf80e0e4 | 692 | return crypto_ahash_update(hp->md5_req); |
49a72dfb | 693 | } |
c7da57a1 | 694 | |
19689e38 | 695 | static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, |
b71d1d42 | 696 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 697 | const struct tcphdr *th) |
49a72dfb AL |
698 | { |
699 | struct tcp_md5sig_pool *hp; | |
cf80e0e4 | 700 | struct ahash_request *req; |
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 | 708 | goto clear_hash; |
19689e38 | 709 | if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2)) |
49a72dfb AL |
710 | goto clear_hash; |
711 | if (tcp_md5_hash_key(hp, key)) | |
712 | goto clear_hash; | |
cf80e0e4 HX |
713 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
714 | if (crypto_ahash_final(req)) | |
cfb6eeb4 | 715 | goto clear_hash; |
cfb6eeb4 | 716 | |
cfb6eeb4 | 717 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 718 | return 0; |
49a72dfb | 719 | |
cfb6eeb4 YH |
720 | clear_hash: |
721 | tcp_put_md5sig_pool(); | |
722 | clear_hash_noput: | |
723 | memset(md5_hash, 0, 16); | |
49a72dfb | 724 | return 1; |
cfb6eeb4 YH |
725 | } |
726 | ||
39f8e58e ED |
727 | static int tcp_v6_md5_hash_skb(char *md5_hash, |
728 | const struct tcp_md5sig_key *key, | |
318cf7aa | 729 | const struct sock *sk, |
318cf7aa | 730 | const struct sk_buff *skb) |
cfb6eeb4 | 731 | { |
b71d1d42 | 732 | const struct in6_addr *saddr, *daddr; |
49a72dfb | 733 | struct tcp_md5sig_pool *hp; |
cf80e0e4 | 734 | struct ahash_request *req; |
318cf7aa | 735 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 736 | |
39f8e58e ED |
737 | if (sk) { /* valid for establish/request sockets */ |
738 | saddr = &sk->sk_v6_rcv_saddr; | |
efe4208f | 739 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 740 | } else { |
b71d1d42 | 741 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
742 | saddr = &ip6h->saddr; |
743 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 744 | } |
49a72dfb AL |
745 | |
746 | hp = tcp_get_md5sig_pool(); | |
747 | if (!hp) | |
748 | goto clear_hash_noput; | |
cf80e0e4 | 749 | req = hp->md5_req; |
49a72dfb | 750 | |
cf80e0e4 | 751 | if (crypto_ahash_init(req)) |
49a72dfb AL |
752 | goto clear_hash; |
753 | ||
19689e38 | 754 | if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len)) |
49a72dfb AL |
755 | goto clear_hash; |
756 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
757 | goto clear_hash; | |
758 | if (tcp_md5_hash_key(hp, key)) | |
759 | goto clear_hash; | |
cf80e0e4 HX |
760 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
761 | if (crypto_ahash_final(req)) | |
49a72dfb AL |
762 | goto clear_hash; |
763 | ||
764 | tcp_put_md5sig_pool(); | |
765 | return 0; | |
766 | ||
767 | clear_hash: | |
768 | tcp_put_md5sig_pool(); | |
769 | clear_hash_noput: | |
770 | memset(md5_hash, 0, 16); | |
771 | return 1; | |
cfb6eeb4 YH |
772 | } |
773 | ||
ba8e275a ED |
774 | #endif |
775 | ||
b40cf18e ED |
776 | static void tcp_v6_init_req(struct request_sock *req, |
777 | const struct sock *sk_listener, | |
16bea70a OP |
778 | struct sk_buff *skb) |
779 | { | |
c2027d1e | 780 | bool l3_slave = ipv6_l3mdev_skb(TCP_SKB_CB(skb)->header.h6.flags); |
16bea70a | 781 | struct inet_request_sock *ireq = inet_rsk(req); |
93a77c11 | 782 | const struct ipv6_pinfo *np = tcp_inet6_sk(sk_listener); |
16bea70a OP |
783 | |
784 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
785 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
786 | ||
16bea70a | 787 | /* So that link locals have meaning */ |
c2027d1e | 788 | if ((!sk_listener->sk_bound_dev_if || l3_slave) && |
16bea70a | 789 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
870c3151 | 790 | ireq->ir_iif = tcp_v6_iif(skb); |
16bea70a | 791 | |
04317daf | 792 | if (!TCP_SKB_CB(skb)->tcp_tw_isn && |
b40cf18e | 793 | (ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) || |
a224772d | 794 | np->rxopt.bits.rxinfo || |
16bea70a OP |
795 | np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim || |
796 | np->rxopt.bits.rxohlim || np->repflow)) { | |
63354797 | 797 | refcount_inc(&skb->users); |
16bea70a OP |
798 | ireq->pktopts = skb; |
799 | } | |
800 | } | |
801 | ||
f964629e | 802 | static struct dst_entry *tcp_v6_route_req(const struct sock *sk, |
7ea851d1 | 803 | struct sk_buff *skb, |
f964629e | 804 | struct flowi *fl, |
7ea851d1 | 805 | struct request_sock *req) |
d94e0417 | 806 | { |
7ea851d1 FW |
807 | tcp_v6_init_req(req, sk, skb); |
808 | ||
809 | if (security_inet_conn_request(sk, skb, req)) | |
810 | return NULL; | |
811 | ||
f76b33c3 | 812 | return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP); |
d94e0417 OP |
813 | } |
814 | ||
c6aefafb | 815 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 816 | .family = AF_INET6, |
2e6599cb | 817 | .obj_size = sizeof(struct tcp6_request_sock), |
5db92c99 | 818 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
819 | .send_ack = tcp_v6_reqsk_send_ack, |
820 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 821 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 822 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
823 | }; |
824 | ||
35b2c321 | 825 | const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
2aec4a29 OP |
826 | .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - |
827 | sizeof(struct ipv6hdr), | |
16bea70a | 828 | #ifdef CONFIG_TCP_MD5SIG |
fd3a154a | 829 | .req_md5_lookup = tcp_v6_md5_lookup, |
e3afe7b7 | 830 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
b6332e6c | 831 | #endif |
fb7b37a7 OP |
832 | #ifdef CONFIG_SYN_COOKIES |
833 | .cookie_init_seq = cookie_v6_init_sequence, | |
834 | #endif | |
d94e0417 | 835 | .route_req = tcp_v6_route_req, |
84b114b9 ED |
836 | .init_seq = tcp_v6_init_seq, |
837 | .init_ts_off = tcp_v6_init_ts_off, | |
d6274bd8 | 838 | .send_synack = tcp_v6_send_synack, |
16bea70a | 839 | }; |
cfb6eeb4 | 840 | |
a00e7444 | 841 | static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae ED |
842 | u32 ack, u32 win, u32 tsval, u32 tsecr, |
843 | int oif, struct tcp_md5sig_key *key, int rst, | |
e9a5dcee | 844 | u8 tclass, __be32 label, u32 priority) |
1da177e4 | 845 | { |
cf533ea5 ED |
846 | const struct tcphdr *th = tcp_hdr(skb); |
847 | struct tcphdr *t1; | |
1da177e4 | 848 | struct sk_buff *buff; |
4c9483b2 | 849 | struct flowi6 fl6; |
0f85feae | 850 | struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
e5047992 | 851 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 852 | unsigned int tot_len = sizeof(struct tcphdr); |
dc87efdb | 853 | __be32 mrst = 0, *topt; |
adf30907 | 854 | struct dst_entry *dst; |
00483690 | 855 | __u32 mark = 0; |
1da177e4 | 856 | |
ee684b6f | 857 | if (tsecr) |
626e264d | 858 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 859 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
860 | if (key) |
861 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
862 | #endif | |
863 | ||
dc87efdb FW |
864 | #ifdef CONFIG_MPTCP |
865 | if (rst && !key) { | |
866 | mrst = mptcp_reset_option(skb); | |
867 | ||
868 | if (mrst) | |
869 | tot_len += sizeof(__be32); | |
870 | } | |
871 | #endif | |
872 | ||
0ebea8f9 | 873 | buff = alloc_skb(MAX_TCP_HEADER, GFP_ATOMIC); |
63159f29 | 874 | if (!buff) |
1ab1457c | 875 | return; |
1da177e4 | 876 | |
0ebea8f9 | 877 | skb_reserve(buff, MAX_TCP_HEADER); |
1da177e4 | 878 | |
d58ff351 | 879 | t1 = skb_push(buff, tot_len); |
6651ffc8 | 880 | skb_reset_transport_header(buff); |
1da177e4 LT |
881 | |
882 | /* Swap the send and the receive. */ | |
883 | memset(t1, 0, sizeof(*t1)); | |
884 | t1->dest = th->source; | |
885 | t1->source = th->dest; | |
cfb6eeb4 | 886 | t1->doff = tot_len / 4; |
626e264d IJ |
887 | t1->seq = htonl(seq); |
888 | t1->ack_seq = htonl(ack); | |
889 | t1->ack = !rst || !th->ack; | |
890 | t1->rst = rst; | |
891 | t1->window = htons(win); | |
1da177e4 | 892 | |
81ada62d IJ |
893 | topt = (__be32 *)(t1 + 1); |
894 | ||
ee684b6f | 895 | if (tsecr) { |
626e264d IJ |
896 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
897 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
898 | *topt++ = htonl(tsval); |
899 | *topt++ = htonl(tsecr); | |
626e264d IJ |
900 | } |
901 | ||
dc87efdb FW |
902 | if (mrst) |
903 | *topt++ = mrst; | |
904 | ||
cfb6eeb4 YH |
905 | #ifdef CONFIG_TCP_MD5SIG |
906 | if (key) { | |
81ada62d IJ |
907 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
908 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
909 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
910 | &ipv6_hdr(skb)->saddr, |
911 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
912 | } |
913 | #endif | |
914 | ||
4c9483b2 | 915 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
916 | fl6.daddr = ipv6_hdr(skb)->saddr; |
917 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 918 | fl6.flowlabel = label; |
1da177e4 | 919 | |
e5700aff | 920 | buff->ip_summed = CHECKSUM_PARTIAL; |
e5700aff | 921 | |
4c9483b2 | 922 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 923 | |
4c9483b2 | 924 | fl6.flowi6_proto = IPPROTO_TCP; |
a36dbdb2 | 925 | if (rt6_need_strict(&fl6.daddr) && !oif) |
870c3151 | 926 | fl6.flowi6_oif = tcp_v6_iif(skb); |
9b6c14d5 DA |
927 | else { |
928 | if (!oif && netif_index_is_l3_master(net, skb->skb_iif)) | |
929 | oif = skb->skb_iif; | |
930 | ||
931 | fl6.flowi6_oif = oif; | |
932 | } | |
1d2f7b2d | 933 | |
c67b8555 ED |
934 | if (sk) { |
935 | if (sk->sk_state == TCP_TIME_WAIT) { | |
936 | mark = inet_twsk(sk)->tw_mark; | |
937 | /* autoflowlabel relies on buff->hash */ | |
938 | skb_set_hash(buff, inet_twsk(sk)->tw_txhash, | |
939 | PKT_HASH_TYPE_L4); | |
940 | } else { | |
941 | mark = sk->sk_mark; | |
942 | } | |
a1ac9c8a | 943 | skb_set_delivery_time(buff, tcp_transmit_time(sk), true); |
c67b8555 | 944 | } |
00483690 | 945 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark) ?: mark; |
1958b856 DM |
946 | fl6.fl6_dport = t1->dest; |
947 | fl6.fl6_sport = t1->source; | |
e2d118a1 | 948 | fl6.flowi6_uid = sock_net_uid(net, sk && sk_fullsock(sk) ? sk : NULL); |
3df98d79 | 949 | security_skb_classify_flow(skb, flowi6_to_flowi_common(&fl6)); |
1da177e4 | 950 | |
c20121ae DL |
951 | /* Pass a socket to ip6_dst_lookup either it is for RST |
952 | * Underlying function will use this to retrieve the network | |
953 | * namespace | |
954 | */ | |
c4e85f73 | 955 | dst = ip6_dst_lookup_flow(sock_net(ctl_sk), ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
956 | if (!IS_ERR(dst)) { |
957 | skb_dst_set(buff, dst); | |
e92dd77e WW |
958 | ip6_xmit(ctl_sk, buff, &fl6, fl6.flowi6_mark, NULL, |
959 | tclass & ~INET_ECN_MASK, priority); | |
c10d9310 | 960 | TCP_INC_STATS(net, TCP_MIB_OUTSEGS); |
68d0c6d3 | 961 | if (rst) |
c10d9310 | 962 | TCP_INC_STATS(net, TCP_MIB_OUTRSTS); |
68d0c6d3 | 963 | return; |
1da177e4 LT |
964 | } |
965 | ||
966 | kfree_skb(buff); | |
967 | } | |
968 | ||
a00e7444 | 969 | static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) |
1da177e4 | 970 | { |
cf533ea5 | 971 | const struct tcphdr *th = tcp_hdr(skb); |
323a53c4 | 972 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
626e264d | 973 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 974 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
975 | #ifdef CONFIG_TCP_MD5SIG |
976 | const __u8 *hash_location = NULL; | |
658ddaaf SL |
977 | unsigned char newhash[16]; |
978 | int genhash; | |
979 | struct sock *sk1 = NULL; | |
980 | #endif | |
323a53c4 | 981 | __be32 label = 0; |
e9a5dcee | 982 | u32 priority = 0; |
323a53c4 | 983 | struct net *net; |
c24b14c4 | 984 | int oif = 0; |
1da177e4 | 985 | |
626e264d | 986 | if (th->rst) |
1da177e4 LT |
987 | return; |
988 | ||
c3658e8d ED |
989 | /* If sk not NULL, it means we did a successful lookup and incoming |
990 | * route had to be correct. prequeue might have dropped our dst. | |
991 | */ | |
992 | if (!sk && !ipv6_unicast_destination(skb)) | |
626e264d | 993 | return; |
1da177e4 | 994 | |
39209673 | 995 | net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
cfb6eeb4 | 996 | #ifdef CONFIG_TCP_MD5SIG |
3b24d854 | 997 | rcu_read_lock(); |
658ddaaf | 998 | hash_location = tcp_parse_md5sig_option(th); |
271c3b9b | 999 | if (sk && sk_fullsock(sk)) { |
dea53bb8 DA |
1000 | int l3index; |
1001 | ||
1002 | /* sdif set, means packet ingressed via a device | |
1003 | * in an L3 domain and inet_iif is set to it. | |
1004 | */ | |
1005 | l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0; | |
1006 | key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr, l3index); | |
e46787f0 | 1007 | } else if (hash_location) { |
d14c77e0 DA |
1008 | int dif = tcp_v6_iif_l3_slave(skb); |
1009 | int sdif = tcp_v6_sdif(skb); | |
dea53bb8 | 1010 | int l3index; |
d14c77e0 | 1011 | |
658ddaaf SL |
1012 | /* |
1013 | * active side is lost. Try to find listening socket through | |
1014 | * source port, and then find md5 key through listening socket. | |
1015 | * we are not loose security here: | |
1016 | * Incoming packet is checked with md5 hash with finding key, | |
1017 | * no RST generated if md5 hash doesn't match. | |
1018 | */ | |
323a53c4 | 1019 | sk1 = inet6_lookup_listener(net, |
a583636a CG |
1020 | &tcp_hashinfo, NULL, 0, |
1021 | &ipv6h->saddr, | |
5ba24953 | 1022 | th->source, &ipv6h->daddr, |
d14c77e0 | 1023 | ntohs(th->source), dif, sdif); |
658ddaaf | 1024 | if (!sk1) |
3b24d854 | 1025 | goto out; |
658ddaaf | 1026 | |
dea53bb8 DA |
1027 | /* sdif set, means packet ingressed via a device |
1028 | * in an L3 domain and dif is set to it. | |
1029 | */ | |
1030 | l3index = tcp_v6_sdif(skb) ? dif : 0; | |
1031 | ||
1032 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr, l3index); | |
658ddaaf | 1033 | if (!key) |
3b24d854 | 1034 | goto out; |
658ddaaf | 1035 | |
39f8e58e | 1036 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb); |
658ddaaf | 1037 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
3b24d854 | 1038 | goto out; |
658ddaaf | 1039 | } |
cfb6eeb4 YH |
1040 | #endif |
1041 | ||
626e264d IJ |
1042 | if (th->ack) |
1043 | seq = ntohl(th->ack_seq); | |
1044 | else | |
1045 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
1046 | (th->doff << 2); | |
1da177e4 | 1047 | |
c24b14c4 SL |
1048 | if (sk) { |
1049 | oif = sk->sk_bound_dev_if; | |
052e0690 ED |
1050 | if (sk_fullsock(sk)) { |
1051 | const struct ipv6_pinfo *np = tcp_inet6_sk(sk); | |
1052 | ||
5c487bb9 | 1053 | trace_tcp_send_reset(sk, skb); |
052e0690 ED |
1054 | if (np->repflow) |
1055 | label = ip6_flowlabel(ipv6h); | |
e9a5dcee | 1056 | priority = sk->sk_priority; |
052e0690 | 1057 | } |
f6c0f5d2 | 1058 | if (sk->sk_state == TCP_TIME_WAIT) { |
50a8accf | 1059 | label = cpu_to_be32(inet_twsk(sk)->tw_flowlabel); |
f6c0f5d2 ED |
1060 | priority = inet_twsk(sk)->tw_priority; |
1061 | } | |
323a53c4 | 1062 | } else { |
a346abe0 | 1063 | if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_TCP_RESET) |
323a53c4 | 1064 | label = ip6_flowlabel(ipv6h); |
c24b14c4 SL |
1065 | } |
1066 | ||
e92dd77e WW |
1067 | tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, |
1068 | ipv6_get_dsfield(ipv6h), label, priority); | |
658ddaaf SL |
1069 | |
1070 | #ifdef CONFIG_TCP_MD5SIG | |
3b24d854 ED |
1071 | out: |
1072 | rcu_read_unlock(); | |
658ddaaf | 1073 | #endif |
626e264d | 1074 | } |
1da177e4 | 1075 | |
a00e7444 | 1076 | static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae | 1077 | u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, |
1d13a96c | 1078 | struct tcp_md5sig_key *key, u8 tclass, |
e9a5dcee | 1079 | __be32 label, u32 priority) |
626e264d | 1080 | { |
0f85feae | 1081 | tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0, |
e9a5dcee | 1082 | tclass, label, priority); |
1da177e4 LT |
1083 | } |
1084 | ||
1085 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1086 | { | |
8feaf0c0 | 1087 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 1088 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 1089 | |
0f85feae | 1090 | tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 1091 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
9a568de4 | 1092 | tcp_time_stamp_raw() + tcptw->tw_ts_offset, |
9c76a114 | 1093 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
f6c0f5d2 | 1094 | tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel), tw->tw_priority); |
1da177e4 | 1095 | |
8feaf0c0 | 1096 | inet_twsk_put(tw); |
1da177e4 LT |
1097 | } |
1098 | ||
a00e7444 | 1099 | static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, |
6edafaaf | 1100 | struct request_sock *req) |
1da177e4 | 1101 | { |
dea53bb8 DA |
1102 | int l3index; |
1103 | ||
1104 | l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0; | |
1105 | ||
3a19ce0e DL |
1106 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
1107 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
1108 | */ | |
20a2b49f ED |
1109 | /* RFC 7323 2.3 |
1110 | * The window field (SEG.WND) of every outgoing segment, with the | |
1111 | * exception of <SYN> segments, MUST be right-shifted by | |
1112 | * Rcv.Wind.Shift bits: | |
1113 | */ | |
0f85feae | 1114 | tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ? |
3a19ce0e | 1115 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
20a2b49f ED |
1116 | tcp_rsk(req)->rcv_nxt, |
1117 | req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale, | |
9a568de4 | 1118 | tcp_time_stamp_raw() + tcp_rsk(req)->ts_off, |
95a22cae | 1119 | req->ts_recent, sk->sk_bound_dev_if, |
dea53bb8 | 1120 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr, l3index), |
e92dd77e | 1121 | ipv6_get_dsfield(ipv6_hdr(skb)), 0, sk->sk_priority); |
1da177e4 LT |
1122 | } |
1123 | ||
1124 | ||
079096f1 | 1125 | static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1126 | { |
079096f1 | 1127 | #ifdef CONFIG_SYN_COOKIES |
aa8223c7 | 1128 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 1129 | |
af9b4738 | 1130 | if (!th->syn) |
c6aefafb | 1131 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1132 | #endif |
1133 | return sk; | |
1134 | } | |
1135 | ||
9349d600 PP |
1136 | u16 tcp_v6_get_syncookie(struct sock *sk, struct ipv6hdr *iph, |
1137 | struct tcphdr *th, u32 *cookie) | |
1138 | { | |
1139 | u16 mss = 0; | |
1140 | #ifdef CONFIG_SYN_COOKIES | |
1141 | mss = tcp_get_syncookie_mss(&tcp6_request_sock_ops, | |
1142 | &tcp_request_sock_ipv6_ops, sk, th); | |
1143 | if (mss) { | |
1144 | *cookie = __cookie_v6_init_sequence(iph, th, &mss); | |
1145 | tcp_synq_overflow(sk); | |
1146 | } | |
1147 | #endif | |
1148 | return mss; | |
1149 | } | |
1150 | ||
1da177e4 LT |
1151 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
1152 | { | |
1da177e4 LT |
1153 | if (skb->protocol == htons(ETH_P_IP)) |
1154 | return tcp_v4_conn_request(sk, skb); | |
1155 | ||
1156 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1157 | goto drop; |
1da177e4 | 1158 | |
dcc32f4f JK |
1159 | if (ipv6_addr_v4mapped(&ipv6_hdr(skb)->saddr)) { |
1160 | __IP6_INC_STATS(sock_net(sk), NULL, IPSTATS_MIB_INHDRERRORS); | |
1161 | return 0; | |
1162 | } | |
1163 | ||
1fb6f159 OP |
1164 | return tcp_conn_request(&tcp6_request_sock_ops, |
1165 | &tcp_request_sock_ipv6_ops, sk, skb); | |
1da177e4 LT |
1166 | |
1167 | drop: | |
9caad864 | 1168 | tcp_listendrop(sk); |
1da177e4 LT |
1169 | return 0; /* don't send reset */ |
1170 | } | |
1171 | ||
ebf6c9cb ED |
1172 | static void tcp_v6_restore_cb(struct sk_buff *skb) |
1173 | { | |
1174 | /* We need to move header back to the beginning if xfrm6_policy_check() | |
1175 | * and tcp_v6_fill_cb() are going to be called again. | |
1176 | * ip6_datagram_recv_specific_ctl() also expects IP6CB to be there. | |
1177 | */ | |
1178 | memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6, | |
1179 | sizeof(struct inet6_skb_parm)); | |
1180 | } | |
1181 | ||
0c27171e | 1182 | static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, |
4c99aa40 | 1183 | struct request_sock *req, |
5e0724d0 ED |
1184 | struct dst_entry *dst, |
1185 | struct request_sock *req_unhash, | |
1186 | bool *own_req) | |
1da177e4 | 1187 | { |
634fb979 | 1188 | struct inet_request_sock *ireq; |
0c27171e | 1189 | struct ipv6_pinfo *newnp; |
93a77c11 | 1190 | const struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
45f6fad8 | 1191 | struct ipv6_txoptions *opt; |
1da177e4 | 1192 | struct inet_sock *newinet; |
01770a16 | 1193 | bool found_dup_sk = false; |
1da177e4 LT |
1194 | struct tcp_sock *newtp; |
1195 | struct sock *newsk; | |
cfb6eeb4 YH |
1196 | #ifdef CONFIG_TCP_MD5SIG |
1197 | struct tcp_md5sig_key *key; | |
dea53bb8 | 1198 | int l3index; |
cfb6eeb4 | 1199 | #endif |
3840a06e | 1200 | struct flowi6 fl6; |
1da177e4 LT |
1201 | |
1202 | if (skb->protocol == htons(ETH_P_IP)) { | |
1203 | /* | |
1204 | * v6 mapped | |
1205 | */ | |
1206 | ||
5e0724d0 ED |
1207 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst, |
1208 | req_unhash, own_req); | |
1da177e4 | 1209 | |
63159f29 | 1210 | if (!newsk) |
1da177e4 LT |
1211 | return NULL; |
1212 | ||
93a77c11 | 1213 | inet_sk(newsk)->pinet6 = tcp_inet6_sk(newsk); |
1da177e4 | 1214 | |
93a77c11 | 1215 | newnp = tcp_inet6_sk(newsk); |
1da177e4 LT |
1216 | newtp = tcp_sk(newsk); |
1217 | ||
1218 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1219 | ||
d1e559d0 | 1220 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
1da177e4 | 1221 | |
8292a17a | 1222 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
cec37a6e | 1223 | if (sk_is_mptcp(newsk)) |
31484d56 | 1224 | mptcpv6_handle_mapped(newsk, true); |
1da177e4 | 1225 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1226 | #ifdef CONFIG_TCP_MD5SIG |
1227 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1228 | #endif | |
1229 | ||
83eaddab | 1230 | newnp->ipv6_mc_list = NULL; |
676a1184 YZ |
1231 | newnp->ipv6_ac_list = NULL; |
1232 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1233 | newnp->pktoptions = NULL; |
1234 | newnp->opt = NULL; | |
89e41309 ED |
1235 | newnp->mcast_oif = inet_iif(skb); |
1236 | newnp->mcast_hops = ip_hdr(skb)->ttl; | |
1237 | newnp->rcv_flowinfo = 0; | |
df3687ff | 1238 | if (np->repflow) |
89e41309 | 1239 | newnp->flow_label = 0; |
1da177e4 | 1240 | |
e6848976 ACM |
1241 | /* |
1242 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1243 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1244 | * that function for the gory details. -acme | |
1da177e4 | 1245 | */ |
1da177e4 LT |
1246 | |
1247 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1248 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1249 | Sync it now. |
1250 | */ | |
d83d8461 | 1251 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1252 | |
1253 | return newsk; | |
1254 | } | |
1255 | ||
634fb979 | 1256 | ireq = inet_rsk(req); |
1da177e4 LT |
1257 | |
1258 | if (sk_acceptq_is_full(sk)) | |
1259 | goto out_overflow; | |
1260 | ||
493f377d | 1261 | if (!dst) { |
f76b33c3 | 1262 | dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_TCP); |
493f377d | 1263 | if (!dst) |
1da177e4 | 1264 | goto out; |
1ab1457c | 1265 | } |
1da177e4 LT |
1266 | |
1267 | newsk = tcp_create_openreq_child(sk, req, skb); | |
63159f29 | 1268 | if (!newsk) |
093d2823 | 1269 | goto out_nonewsk; |
1da177e4 | 1270 | |
e6848976 ACM |
1271 | /* |
1272 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1273 | * count here, tcp_create_openreq_child now does this for us, see the | |
1274 | * comment in that function for the gory details. -acme | |
1275 | */ | |
1da177e4 | 1276 | |
59eed279 | 1277 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
6bd4f355 | 1278 | ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1279 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 | 1280 | |
93a77c11 | 1281 | inet_sk(newsk)->pinet6 = tcp_inet6_sk(newsk); |
1da177e4 LT |
1282 | |
1283 | newtp = tcp_sk(newsk); | |
1284 | newinet = inet_sk(newsk); | |
93a77c11 | 1285 | newnp = tcp_inet6_sk(newsk); |
1da177e4 LT |
1286 | |
1287 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1288 | ||
634fb979 ED |
1289 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1290 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1291 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1292 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1293 | |
1ab1457c | 1294 | /* Now IPv6 options... |
1da177e4 LT |
1295 | |
1296 | First: no IPv4 options. | |
1297 | */ | |
f6d8bd05 | 1298 | newinet->inet_opt = NULL; |
83eaddab | 1299 | newnp->ipv6_mc_list = NULL; |
676a1184 | 1300 | newnp->ipv6_ac_list = NULL; |
d35690be | 1301 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1302 | |
1303 | /* Clone RX bits */ | |
1304 | newnp->rxopt.all = np->rxopt.all; | |
1305 | ||
1da177e4 | 1306 | newnp->pktoptions = NULL; |
1da177e4 | 1307 | newnp->opt = NULL; |
870c3151 | 1308 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1309 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1310 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1311 | if (np->repflow) |
1312 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 | 1313 | |
8ef44b6f WW |
1314 | /* Set ToS of the new socket based upon the value of incoming SYN. |
1315 | * ECT bits are set later in tcp_init_transfer(). | |
1316 | */ | |
ac8f1710 WW |
1317 | if (sock_net(sk)->ipv4.sysctl_tcp_reflect_tos) |
1318 | newnp->tclass = tcp_rsk(req)->syn_tos & ~INET_ECN_MASK; | |
1319 | ||
1da177e4 LT |
1320 | /* Clone native IPv6 options from listening socket (if any) |
1321 | ||
1322 | Yes, keeping reference count would be much more clever, | |
1323 | but we make one more one thing there: reattach optmem | |
1324 | to newsk. | |
1325 | */ | |
56ac42bc HD |
1326 | opt = ireq->ipv6_opt; |
1327 | if (!opt) | |
1328 | opt = rcu_dereference(np->opt); | |
45f6fad8 ED |
1329 | if (opt) { |
1330 | opt = ipv6_dup_options(newsk, opt); | |
1331 | RCU_INIT_POINTER(newnp->opt, opt); | |
1332 | } | |
d83d8461 | 1333 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
1334 | if (opt) |
1335 | inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen + | |
1336 | opt->opt_flen; | |
1da177e4 | 1337 | |
81164413 DB |
1338 | tcp_ca_openreq_child(newsk, dst); |
1339 | ||
1da177e4 | 1340 | tcp_sync_mss(newsk, dst_mtu(dst)); |
3541f9e8 | 1341 | newtp->advmss = tcp_mss_clamp(tcp_sk(sk), dst_metric_advmss(dst)); |
d135c522 | 1342 | |
1da177e4 LT |
1343 | tcp_initialize_rcv_mss(newsk); |
1344 | ||
c720c7e8 ED |
1345 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1346 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1347 | |
cfb6eeb4 | 1348 | #ifdef CONFIG_TCP_MD5SIG |
dea53bb8 DA |
1349 | l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif); |
1350 | ||
cfb6eeb4 | 1351 | /* Copy over the MD5 key from the original socket */ |
dea53bb8 | 1352 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr, l3index); |
53b24b8f | 1353 | if (key) { |
cfb6eeb4 YH |
1354 | /* We're using one, so create a matching key |
1355 | * on the newsk structure. If we fail to get | |
1356 | * memory, then we end up not copying the key | |
1357 | * across. Shucks. | |
1358 | */ | |
efe4208f | 1359 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
a76c2315 | 1360 | AF_INET6, 128, l3index, key->flags, key->key, key->keylen, |
7450aaf6 | 1361 | sk_gfp_mask(sk, GFP_ATOMIC)); |
cfb6eeb4 YH |
1362 | } |
1363 | #endif | |
1364 | ||
093d2823 | 1365 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1366 | inet_csk_prepare_forced_close(newsk); |
1367 | tcp_done(newsk); | |
093d2823 BS |
1368 | goto out; |
1369 | } | |
01770a16 RD |
1370 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash), |
1371 | &found_dup_sk); | |
805c4bc0 | 1372 | if (*own_req) { |
49a496c9 | 1373 | tcp_move_syn(newtp, req); |
805c4bc0 ED |
1374 | |
1375 | /* Clone pktoptions received with SYN, if we own the req */ | |
1376 | if (ireq->pktopts) { | |
1377 | newnp->pktoptions = skb_clone(ireq->pktopts, | |
7450aaf6 | 1378 | sk_gfp_mask(sk, GFP_ATOMIC)); |
805c4bc0 ED |
1379 | consume_skb(ireq->pktopts); |
1380 | ireq->pktopts = NULL; | |
ebf6c9cb ED |
1381 | if (newnp->pktoptions) { |
1382 | tcp_v6_restore_cb(newnp->pktoptions); | |
805c4bc0 | 1383 | skb_set_owner_r(newnp->pktoptions, newsk); |
ebf6c9cb | 1384 | } |
805c4bc0 | 1385 | } |
01770a16 RD |
1386 | } else { |
1387 | if (!req_unhash && found_dup_sk) { | |
1388 | /* This code path should only be executed in the | |
1389 | * syncookie case only | |
1390 | */ | |
1391 | bh_unlock_sock(newsk); | |
1392 | sock_put(newsk); | |
1393 | newsk = NULL; | |
1394 | } | |
ce105008 | 1395 | } |
1da177e4 LT |
1396 | |
1397 | return newsk; | |
1398 | ||
1399 | out_overflow: | |
02a1d6e7 | 1400 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1401 | out_nonewsk: |
1da177e4 | 1402 | dst_release(dst); |
093d2823 | 1403 | out: |
9caad864 | 1404 | tcp_listendrop(sk); |
1da177e4 LT |
1405 | return NULL; |
1406 | } | |
1407 | ||
bbd807df BV |
1408 | INDIRECT_CALLABLE_DECLARE(struct dst_entry *ipv4_dst_check(struct dst_entry *, |
1409 | u32)); | |
1da177e4 | 1410 | /* The socket must have it's spinlock held when we get |
e994b2f0 | 1411 | * here, unless it is a TCP_LISTEN socket. |
1da177e4 LT |
1412 | * |
1413 | * We have a potential double-lock case here, so even when | |
1414 | * doing backlog processing we use the BH locking scheme. | |
1415 | * This is because we cannot sleep with the original spinlock | |
1416 | * held. | |
1417 | */ | |
d2489c7b ED |
1418 | INDIRECT_CALLABLE_SCOPE |
1419 | int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1da177e4 | 1420 | { |
93a77c11 | 1421 | struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
1da177e4 | 1422 | struct sk_buff *opt_skb = NULL; |
8eba65fa | 1423 | enum skb_drop_reason reason; |
93a77c11 | 1424 | struct tcp_sock *tp; |
1da177e4 LT |
1425 | |
1426 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1427 | goes to IPv4 receive handler and backlogged. | |
1428 | From backlog it always goes here. Kerboom... | |
1429 | Fortunately, tcp_rcv_established and rcv_established | |
1430 | handle them correctly, but it is not case with | |
1431 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1432 | */ | |
1433 | ||
1434 | if (skb->protocol == htons(ETH_P_IP)) | |
1435 | return tcp_v4_do_rcv(sk, skb); | |
1436 | ||
1da177e4 LT |
1437 | /* |
1438 | * socket locking is here for SMP purposes as backlog rcv | |
1439 | * is currently called with bh processing disabled. | |
1440 | */ | |
1441 | ||
1442 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1443 | ||
1444 | Yes, guys, it is the only place in our code, where we | |
1445 | may make it not affecting IPv4. | |
1446 | The rest of code is protocol independent, | |
1447 | and I do not like idea to uglify IPv4. | |
1448 | ||
1449 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1450 | looks not very well thought. For now we latch | |
1451 | options, received in the last packet, enqueued | |
1452 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1453 | --ANK (980728) |
1da177e4 LT |
1454 | */ |
1455 | if (np->rxopt.all) | |
7450aaf6 | 1456 | opt_skb = skb_clone(skb, sk_gfp_mask(sk, GFP_ATOMIC)); |
1da177e4 | 1457 | |
8eba65fa | 1458 | reason = SKB_DROP_REASON_NOT_SPECIFIED; |
1da177e4 | 1459 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
8f905c0e ED |
1460 | struct dst_entry *dst; |
1461 | ||
1462 | dst = rcu_dereference_protected(sk->sk_rx_dst, | |
1463 | lockdep_sock_is_held(sk)); | |
5d299f3d | 1464 | |
bdeab991 | 1465 | sock_rps_save_rxhash(sk, skb); |
3d97379a | 1466 | sk_mark_napi_id(sk, skb); |
5d299f3d | 1467 | if (dst) { |
0c0a5ef8 | 1468 | if (sk->sk_rx_dst_ifindex != skb->skb_iif || |
bbd807df | 1469 | INDIRECT_CALL_1(dst->ops->check, ip6_dst_check, |
ef57c161 | 1470 | dst, sk->sk_rx_dst_cookie) == NULL) { |
8f905c0e | 1471 | RCU_INIT_POINTER(sk->sk_rx_dst, NULL); |
5d299f3d | 1472 | dst_release(dst); |
5d299f3d ED |
1473 | } |
1474 | } | |
1475 | ||
3d97d88e | 1476 | tcp_rcv_established(sk, skb); |
1da177e4 LT |
1477 | if (opt_skb) |
1478 | goto ipv6_pktoptions; | |
1479 | return 0; | |
1480 | } | |
1481 | ||
12e25e10 | 1482 | if (tcp_checksum_complete(skb)) |
1da177e4 LT |
1483 | goto csum_err; |
1484 | ||
1ab1457c | 1485 | if (sk->sk_state == TCP_LISTEN) { |
079096f1 ED |
1486 | struct sock *nsk = tcp_v6_cookie_check(sk, skb); |
1487 | ||
1da177e4 LT |
1488 | if (!nsk) |
1489 | goto discard; | |
1490 | ||
4c99aa40 | 1491 | if (nsk != sk) { |
1da177e4 LT |
1492 | if (tcp_child_process(sk, nsk, skb)) |
1493 | goto reset; | |
1494 | if (opt_skb) | |
1495 | __kfree_skb(opt_skb); | |
1496 | return 0; | |
1497 | } | |
47482f13 | 1498 | } else |
bdeab991 | 1499 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1500 | |
72ab4a86 | 1501 | if (tcp_rcv_state_process(sk, skb)) |
1da177e4 | 1502 | goto reset; |
1da177e4 LT |
1503 | if (opt_skb) |
1504 | goto ipv6_pktoptions; | |
1505 | return 0; | |
1506 | ||
1507 | reset: | |
cfb6eeb4 | 1508 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1509 | discard: |
1510 | if (opt_skb) | |
1511 | __kfree_skb(opt_skb); | |
8eba65fa | 1512 | kfree_skb_reason(skb, reason); |
1da177e4 LT |
1513 | return 0; |
1514 | csum_err: | |
8eba65fa | 1515 | reason = SKB_DROP_REASON_TCP_CSUM; |
709c0314 | 1516 | trace_tcp_bad_csum(skb); |
c10d9310 ED |
1517 | TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS); |
1518 | TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS); | |
1da177e4 LT |
1519 | goto discard; |
1520 | ||
1521 | ||
1522 | ipv6_pktoptions: | |
1523 | /* Do you ask, what is it? | |
1524 | ||
1525 | 1. skb was enqueued by tcp. | |
1526 | 2. skb is added to tail of read queue, rather than out of order. | |
1527 | 3. socket is not in passive state. | |
1528 | 4. Finally, it really contains options, which user wants to receive. | |
1529 | */ | |
1530 | tp = tcp_sk(sk); | |
1531 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1532 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1533 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
870c3151 | 1534 | np->mcast_oif = tcp_v6_iif(opt_skb); |
333fad53 | 1535 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1536 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
82e9f105 | 1537 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1538 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
df3687ff FF |
1539 | if (np->repflow) |
1540 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
a224772d | 1541 | if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) { |
1da177e4 | 1542 | skb_set_owner_r(opt_skb, sk); |
8ce48623 | 1543 | tcp_v6_restore_cb(opt_skb); |
1da177e4 LT |
1544 | opt_skb = xchg(&np->pktoptions, opt_skb); |
1545 | } else { | |
1546 | __kfree_skb(opt_skb); | |
1547 | opt_skb = xchg(&np->pktoptions, NULL); | |
1548 | } | |
1549 | } | |
1550 | ||
12c8691d | 1551 | consume_skb(opt_skb); |
1da177e4 LT |
1552 | return 0; |
1553 | } | |
1554 | ||
2dc49d16 ND |
1555 | static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr, |
1556 | const struct tcphdr *th) | |
1557 | { | |
1558 | /* This is tricky: we move IP6CB at its correct location into | |
1559 | * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because | |
1560 | * _decode_session6() uses IP6CB(). | |
1561 | * barrier() makes sure compiler won't play aliasing games. | |
1562 | */ | |
1563 | memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb), | |
1564 | sizeof(struct inet6_skb_parm)); | |
1565 | barrier(); | |
1566 | ||
1567 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1568 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1569 | skb->len - th->doff*4); | |
1570 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1571 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); | |
1572 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; | |
1573 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); | |
1574 | TCP_SKB_CB(skb)->sacked = 0; | |
98aaa913 MM |
1575 | TCP_SKB_CB(skb)->has_rxtstamp = |
1576 | skb->tstamp || skb_hwtstamps(skb)->hwtstamp; | |
2dc49d16 ND |
1577 | } |
1578 | ||
0e219ae4 | 1579 | INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1580 | { |
c0e3154d | 1581 | enum skb_drop_reason drop_reason; |
4297a0ef | 1582 | int sdif = inet6_sdif(skb); |
d14c77e0 | 1583 | int dif = inet6_iif(skb); |
cf533ea5 | 1584 | const struct tcphdr *th; |
b71d1d42 | 1585 | const struct ipv6hdr *hdr; |
3b24d854 | 1586 | bool refcounted; |
1da177e4 LT |
1587 | struct sock *sk; |
1588 | int ret; | |
a86b1e30 | 1589 | struct net *net = dev_net(skb->dev); |
1da177e4 | 1590 | |
c0e3154d | 1591 | drop_reason = SKB_DROP_REASON_NOT_SPECIFIED; |
1da177e4 LT |
1592 | if (skb->pkt_type != PACKET_HOST) |
1593 | goto discard_it; | |
1594 | ||
1595 | /* | |
1596 | * Count it even if it's bad. | |
1597 | */ | |
90bbcc60 | 1598 | __TCP_INC_STATS(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1599 | |
1600 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1601 | goto discard_it; | |
1602 | ||
ea1627c2 | 1603 | th = (const struct tcphdr *)skb->data; |
1da177e4 | 1604 | |
c0e3154d MD |
1605 | if (unlikely(th->doff < sizeof(struct tcphdr) / 4)) { |
1606 | drop_reason = SKB_DROP_REASON_PKT_TOO_SMALL; | |
1da177e4 | 1607 | goto bad_packet; |
c0e3154d | 1608 | } |
1da177e4 LT |
1609 | if (!pskb_may_pull(skb, th->doff*4)) |
1610 | goto discard_it; | |
1611 | ||
e4f45b7f | 1612 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
6a5dc9e5 | 1613 | goto csum_error; |
1da177e4 | 1614 | |
ea1627c2 | 1615 | th = (const struct tcphdr *)skb->data; |
e802af9c | 1616 | hdr = ipv6_hdr(skb); |
1da177e4 | 1617 | |
4bdc3d66 | 1618 | lookup: |
a583636a | 1619 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, __tcp_hdrlen(th), |
4297a0ef | 1620 | th->source, th->dest, inet6_iif(skb), sdif, |
3b24d854 | 1621 | &refcounted); |
1da177e4 LT |
1622 | if (!sk) |
1623 | goto no_tcp_socket; | |
1624 | ||
1625 | process: | |
1626 | if (sk->sk_state == TCP_TIME_WAIT) | |
1627 | goto do_time_wait; | |
1628 | ||
079096f1 ED |
1629 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
1630 | struct request_sock *req = inet_reqsk(sk); | |
e0f9759f | 1631 | bool req_stolen = false; |
7716682c | 1632 | struct sock *nsk; |
079096f1 ED |
1633 | |
1634 | sk = req->rsk_listener; | |
1330b6ef JK |
1635 | drop_reason = tcp_inbound_md5_hash(sk, skb, |
1636 | &hdr->saddr, &hdr->daddr, | |
1637 | AF_INET6, dif, sdif); | |
1638 | if (drop_reason) { | |
e65c332d | 1639 | sk_drops_add(sk, skb); |
079096f1 ED |
1640 | reqsk_put(req); |
1641 | goto discard_it; | |
1642 | } | |
4fd44a98 FL |
1643 | if (tcp_checksum_complete(skb)) { |
1644 | reqsk_put(req); | |
1645 | goto csum_error; | |
1646 | } | |
7716682c | 1647 | if (unlikely(sk->sk_state != TCP_LISTEN)) { |
d4f2c86b KI |
1648 | nsk = reuseport_migrate_sock(sk, req_to_sk(req), skb); |
1649 | if (!nsk) { | |
1650 | inet_csk_reqsk_queue_drop_and_put(sk, req); | |
1651 | goto lookup; | |
1652 | } | |
1653 | sk = nsk; | |
1654 | /* reuseport_migrate_sock() has already held one sk_refcnt | |
1655 | * before returning. | |
1656 | */ | |
1657 | } else { | |
1658 | sock_hold(sk); | |
4bdc3d66 | 1659 | } |
3b24d854 | 1660 | refcounted = true; |
1f3b359f | 1661 | nsk = NULL; |
eeea10b8 ED |
1662 | if (!tcp_filter(sk, skb)) { |
1663 | th = (const struct tcphdr *)skb->data; | |
1664 | hdr = ipv6_hdr(skb); | |
1665 | tcp_v6_fill_cb(skb, hdr, th); | |
e0f9759f | 1666 | nsk = tcp_check_req(sk, skb, req, false, &req_stolen); |
c0e3154d MD |
1667 | } else { |
1668 | drop_reason = SKB_DROP_REASON_SOCKET_FILTER; | |
eeea10b8 | 1669 | } |
079096f1 ED |
1670 | if (!nsk) { |
1671 | reqsk_put(req); | |
e0f9759f ED |
1672 | if (req_stolen) { |
1673 | /* Another cpu got exclusive access to req | |
1674 | * and created a full blown socket. | |
1675 | * Try to feed this packet to this socket | |
1676 | * instead of discarding it. | |
1677 | */ | |
1678 | tcp_v6_restore_cb(skb); | |
1679 | sock_put(sk); | |
1680 | goto lookup; | |
1681 | } | |
7716682c | 1682 | goto discard_and_relse; |
079096f1 ED |
1683 | } |
1684 | if (nsk == sk) { | |
079096f1 ED |
1685 | reqsk_put(req); |
1686 | tcp_v6_restore_cb(skb); | |
1687 | } else if (tcp_child_process(sk, nsk, skb)) { | |
1688 | tcp_v6_send_reset(nsk, skb); | |
7716682c | 1689 | goto discard_and_relse; |
079096f1 | 1690 | } else { |
7716682c | 1691 | sock_put(sk); |
079096f1 ED |
1692 | return 0; |
1693 | } | |
1694 | } | |
790eb673 ED |
1695 | |
1696 | if (static_branch_unlikely(&ip6_min_hopcount)) { | |
1697 | /* min_hopcount can be changed concurrently from do_ipv6_setsockopt() */ | |
1698 | if (hdr->hop_limit < READ_ONCE(tcp_inet6_sk(sk)->min_hopcount)) { | |
1699 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); | |
1700 | goto discard_and_relse; | |
1701 | } | |
e802af9c SH |
1702 | } |
1703 | ||
c0e3154d MD |
1704 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { |
1705 | drop_reason = SKB_DROP_REASON_XFRM_POLICY; | |
1da177e4 | 1706 | goto discard_and_relse; |
c0e3154d | 1707 | } |
1da177e4 | 1708 | |
1330b6ef JK |
1709 | drop_reason = tcp_inbound_md5_hash(sk, skb, &hdr->saddr, &hdr->daddr, |
1710 | AF_INET6, dif, sdif); | |
1711 | if (drop_reason) | |
9ea88a15 | 1712 | goto discard_and_relse; |
9ea88a15 | 1713 | |
c0e3154d MD |
1714 | if (tcp_filter(sk, skb)) { |
1715 | drop_reason = SKB_DROP_REASON_SOCKET_FILTER; | |
1da177e4 | 1716 | goto discard_and_relse; |
c0e3154d | 1717 | } |
ac6e7800 ED |
1718 | th = (const struct tcphdr *)skb->data; |
1719 | hdr = ipv6_hdr(skb); | |
eeea10b8 | 1720 | tcp_v6_fill_cb(skb, hdr, th); |
1da177e4 LT |
1721 | |
1722 | skb->dev = NULL; | |
1723 | ||
e994b2f0 ED |
1724 | if (sk->sk_state == TCP_LISTEN) { |
1725 | ret = tcp_v6_do_rcv(sk, skb); | |
1726 | goto put_and_return; | |
1727 | } | |
1728 | ||
1729 | sk_incoming_cpu_update(sk); | |
1730 | ||
f35f8219 | 1731 | sk_defer_free_flush(sk); |
293b9c42 | 1732 | bh_lock_sock_nested(sk); |
a44d6eac | 1733 | tcp_segs_in(tcp_sk(sk), skb); |
1da177e4 LT |
1734 | ret = 0; |
1735 | if (!sock_owned_by_user(sk)) { | |
e7942d06 | 1736 | ret = tcp_v6_do_rcv(sk, skb); |
8b27dae5 | 1737 | } else { |
7a26dc9e | 1738 | if (tcp_add_backlog(sk, skb, &drop_reason)) |
8b27dae5 | 1739 | goto discard_and_relse; |
6b03a53a | 1740 | } |
1da177e4 | 1741 | bh_unlock_sock(sk); |
e994b2f0 | 1742 | put_and_return: |
3b24d854 ED |
1743 | if (refcounted) |
1744 | sock_put(sk); | |
1da177e4 LT |
1745 | return ret ? -1 : 0; |
1746 | ||
1747 | no_tcp_socket: | |
c0e3154d | 1748 | drop_reason = SKB_DROP_REASON_NO_SOCKET; |
1da177e4 LT |
1749 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
1750 | goto discard_it; | |
1751 | ||
2dc49d16 ND |
1752 | tcp_v6_fill_cb(skb, hdr, th); |
1753 | ||
12e25e10 | 1754 | if (tcp_checksum_complete(skb)) { |
6a5dc9e5 | 1755 | csum_error: |
c0e3154d | 1756 | drop_reason = SKB_DROP_REASON_TCP_CSUM; |
709c0314 | 1757 | trace_tcp_bad_csum(skb); |
90bbcc60 | 1758 | __TCP_INC_STATS(net, TCP_MIB_CSUMERRORS); |
1da177e4 | 1759 | bad_packet: |
90bbcc60 | 1760 | __TCP_INC_STATS(net, TCP_MIB_INERRS); |
1da177e4 | 1761 | } else { |
cfb6eeb4 | 1762 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1763 | } |
1764 | ||
1765 | discard_it: | |
c0e3154d | 1766 | kfree_skb_reason(skb, drop_reason); |
1da177e4 LT |
1767 | return 0; |
1768 | ||
1769 | discard_and_relse: | |
532182cd | 1770 | sk_drops_add(sk, skb); |
3b24d854 ED |
1771 | if (refcounted) |
1772 | sock_put(sk); | |
1da177e4 LT |
1773 | goto discard_it; |
1774 | ||
1775 | do_time_wait: | |
1776 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
c0e3154d | 1777 | drop_reason = SKB_DROP_REASON_XFRM_POLICY; |
9469c7b4 | 1778 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1779 | goto discard_it; |
1780 | } | |
1781 | ||
2dc49d16 ND |
1782 | tcp_v6_fill_cb(skb, hdr, th); |
1783 | ||
6a5dc9e5 ED |
1784 | if (tcp_checksum_complete(skb)) { |
1785 | inet_twsk_put(inet_twsk(sk)); | |
1786 | goto csum_error; | |
1da177e4 LT |
1787 | } |
1788 | ||
9469c7b4 | 1789 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1790 | case TCP_TW_SYN: |
1791 | { | |
1792 | struct sock *sk2; | |
1793 | ||
c346dca1 | 1794 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
a583636a | 1795 | skb, __tcp_hdrlen(th), |
5ba24953 | 1796 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1797 | &ipv6_hdr(skb)->daddr, |
24b711ed DA |
1798 | ntohs(th->dest), |
1799 | tcp_v6_iif_l3_slave(skb), | |
4297a0ef | 1800 | sdif); |
53b24b8f | 1801 | if (sk2) { |
295ff7ed | 1802 | struct inet_timewait_sock *tw = inet_twsk(sk); |
dbe7faa4 | 1803 | inet_twsk_deschedule_put(tw); |
1da177e4 | 1804 | sk = sk2; |
4ad19de8 | 1805 | tcp_v6_restore_cb(skb); |
3b24d854 | 1806 | refcounted = false; |
1da177e4 LT |
1807 | goto process; |
1808 | } | |
1da177e4 | 1809 | } |
275757e6 | 1810 | /* to ACK */ |
a8eceea8 | 1811 | fallthrough; |
1da177e4 LT |
1812 | case TCP_TW_ACK: |
1813 | tcp_v6_timewait_ack(sk, skb); | |
1814 | break; | |
1815 | case TCP_TW_RST: | |
271c3b9b FW |
1816 | tcp_v6_send_reset(sk, skb); |
1817 | inet_twsk_deschedule_put(inet_twsk(sk)); | |
1818 | goto discard_it; | |
4aa956d8 WY |
1819 | case TCP_TW_SUCCESS: |
1820 | ; | |
1da177e4 LT |
1821 | } |
1822 | goto discard_it; | |
1823 | } | |
1824 | ||
97ff7ffb | 1825 | INDIRECT_CALLABLE_SCOPE void tcp_v6_early_demux(struct sk_buff *skb) |
c7109986 ED |
1826 | { |
1827 | const struct ipv6hdr *hdr; | |
1828 | const struct tcphdr *th; | |
1829 | struct sock *sk; | |
1830 | ||
1831 | if (skb->pkt_type != PACKET_HOST) | |
1832 | return; | |
1833 | ||
1834 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1835 | return; | |
1836 | ||
1837 | hdr = ipv6_hdr(skb); | |
1838 | th = tcp_hdr(skb); | |
1839 | ||
1840 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1841 | return; | |
1842 | ||
870c3151 | 1843 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
c7109986 ED |
1844 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
1845 | &hdr->saddr, th->source, | |
1846 | &hdr->daddr, ntohs(th->dest), | |
4297a0ef | 1847 | inet6_iif(skb), inet6_sdif(skb)); |
c7109986 ED |
1848 | if (sk) { |
1849 | skb->sk = sk; | |
1850 | skb->destructor = sock_edemux; | |
f7e4eb03 | 1851 | if (sk_fullsock(sk)) { |
8f905c0e | 1852 | struct dst_entry *dst = rcu_dereference(sk->sk_rx_dst); |
f3f12135 | 1853 | |
c7109986 | 1854 | if (dst) |
ef57c161 | 1855 | dst = dst_check(dst, sk->sk_rx_dst_cookie); |
c7109986 | 1856 | if (dst && |
0c0a5ef8 | 1857 | sk->sk_rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1858 | skb_dst_set_noref(skb, dst); |
1859 | } | |
1860 | } | |
1861 | } | |
1862 | ||
ccb7c410 DM |
1863 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1864 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1865 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 1866 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
1867 | }; |
1868 | ||
dd2e0b86 ED |
1869 | INDIRECT_CALLABLE_SCOPE void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
1870 | { | |
37354402 | 1871 | __tcp_v6_send_check(skb, &sk->sk_v6_rcv_saddr, &sk->sk_v6_daddr); |
dd2e0b86 ED |
1872 | } |
1873 | ||
35b2c321 | 1874 | const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1875 | .queue_xmit = inet6_csk_xmit, |
1876 | .send_check = tcp_v6_send_check, | |
1877 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1878 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1879 | .conn_request = tcp_v6_conn_request, |
1880 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1881 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1882 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1883 | .setsockopt = ipv6_setsockopt, |
1884 | .getsockopt = ipv6_getsockopt, | |
1885 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1886 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
4fab9071 | 1887 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 LT |
1888 | }; |
1889 | ||
cfb6eeb4 | 1890 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1891 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1892 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1893 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1894 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1895 | }; |
a928630a | 1896 | #endif |
cfb6eeb4 | 1897 | |
1da177e4 LT |
1898 | /* |
1899 | * TCP over IPv4 via INET6 API | |
1900 | */ | |
3b401a81 | 1901 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1902 | .queue_xmit = ip_queue_xmit, |
1903 | .send_check = tcp_v4_send_check, | |
1904 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1905 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1906 | .conn_request = tcp_v6_conn_request, |
1907 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1908 | .net_header_len = sizeof(struct iphdr), |
1909 | .setsockopt = ipv6_setsockopt, | |
1910 | .getsockopt = ipv6_getsockopt, | |
1911 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1912 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
4fab9071 | 1913 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 LT |
1914 | }; |
1915 | ||
cfb6eeb4 | 1916 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1917 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1918 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1919 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1920 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1921 | }; |
a928630a | 1922 | #endif |
cfb6eeb4 | 1923 | |
1da177e4 LT |
1924 | /* NOTE: A lot of things set to zero explicitly by call to |
1925 | * sk_alloc() so need not be done here. | |
1926 | */ | |
1927 | static int tcp_v6_init_sock(struct sock *sk) | |
1928 | { | |
6687e988 | 1929 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1930 | |
900f65d3 | 1931 | tcp_init_sock(sk); |
1da177e4 | 1932 | |
8292a17a | 1933 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1934 | |
cfb6eeb4 | 1935 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1936 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1937 | #endif |
1938 | ||
1da177e4 LT |
1939 | return 0; |
1940 | } | |
1941 | ||
7d06b2e0 | 1942 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1943 | { |
1da177e4 | 1944 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1945 | inet6_destroy_sock(sk); |
1da177e4 LT |
1946 | } |
1947 | ||
952a10be | 1948 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1949 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1950 | static void get_openreq6(struct seq_file *seq, |
aa3a0c8c | 1951 | const struct request_sock *req, int i) |
1da177e4 | 1952 | { |
fa76ce73 | 1953 | long ttd = req->rsk_timer.expires - jiffies; |
634fb979 ED |
1954 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1955 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1956 | |
1957 | if (ttd < 0) | |
1958 | ttd = 0; | |
1959 | ||
1da177e4 LT |
1960 | seq_printf(seq, |
1961 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1962 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1963 | i, |
1964 | src->s6_addr32[0], src->s6_addr32[1], | |
1965 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1966 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1967 | dest->s6_addr32[0], dest->s6_addr32[1], |
1968 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1969 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 1970 | TCP_SYN_RECV, |
4c99aa40 | 1971 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
1972 | 1, /* timers active (only the expire timer) */ |
1973 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1974 | req->num_timeout, |
aa3a0c8c ED |
1975 | from_kuid_munged(seq_user_ns(seq), |
1976 | sock_i_uid(req->rsk_listener)), | |
1ab1457c | 1977 | 0, /* non standard timer */ |
1da177e4 LT |
1978 | 0, /* open_requests have no inode */ |
1979 | 0, req); | |
1980 | } | |
1981 | ||
1982 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1983 | { | |
b71d1d42 | 1984 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1985 | __u16 destp, srcp; |
1986 | int timer_active; | |
1987 | unsigned long timer_expires; | |
cf533ea5 ED |
1988 | const struct inet_sock *inet = inet_sk(sp); |
1989 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1990 | const struct inet_connection_sock *icsk = inet_csk(sp); |
0536fcc0 | 1991 | const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq; |
00fd38d9 ED |
1992 | int rx_queue; |
1993 | int state; | |
1da177e4 | 1994 | |
efe4208f ED |
1995 | dest = &sp->sk_v6_daddr; |
1996 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1997 | destp = ntohs(inet->inet_dport); |
1998 | srcp = ntohs(inet->inet_sport); | |
463c84b9 | 1999 | |
ce3cf4ec | 2000 | if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
57dde7f7 | 2001 | icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT || |
ce3cf4ec | 2002 | icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { |
1da177e4 | 2003 | timer_active = 1; |
463c84b9 ACM |
2004 | timer_expires = icsk->icsk_timeout; |
2005 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 2006 | timer_active = 4; |
463c84b9 | 2007 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
2008 | } else if (timer_pending(&sp->sk_timer)) { |
2009 | timer_active = 2; | |
2010 | timer_expires = sp->sk_timer.expires; | |
2011 | } else { | |
2012 | timer_active = 0; | |
2013 | timer_expires = jiffies; | |
2014 | } | |
2015 | ||
986ffdfd | 2016 | state = inet_sk_state_load(sp); |
00fd38d9 | 2017 | if (state == TCP_LISTEN) |
288efe86 | 2018 | rx_queue = READ_ONCE(sp->sk_ack_backlog); |
00fd38d9 ED |
2019 | else |
2020 | /* Because we don't lock the socket, | |
2021 | * we might find a transient negative value. | |
2022 | */ | |
dba7d9b8 | 2023 | rx_queue = max_t(int, READ_ONCE(tp->rcv_nxt) - |
7db48e98 | 2024 | READ_ONCE(tp->copied_seq), 0); |
00fd38d9 | 2025 | |
1da177e4 LT |
2026 | seq_printf(seq, |
2027 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 2028 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
2029 | i, |
2030 | src->s6_addr32[0], src->s6_addr32[1], | |
2031 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2032 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2033 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
00fd38d9 | 2034 | state, |
0f317464 | 2035 | READ_ONCE(tp->write_seq) - tp->snd_una, |
00fd38d9 | 2036 | rx_queue, |
1da177e4 | 2037 | timer_active, |
a399a805 | 2038 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 2039 | icsk->icsk_retransmits, |
a7cb5a49 | 2040 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 2041 | icsk->icsk_probes_out, |
1da177e4 | 2042 | sock_i_ino(sp), |
41c6d650 | 2043 | refcount_read(&sp->sk_refcnt), sp, |
7be87351 SH |
2044 | jiffies_to_clock_t(icsk->icsk_rto), |
2045 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
31954cd8 | 2046 | (icsk->icsk_ack.quick << 1) | inet_csk_in_pingpong_mode(sp), |
0b6a05c1 | 2047 | tp->snd_cwnd, |
00fd38d9 | 2048 | state == TCP_LISTEN ? |
0536fcc0 | 2049 | fastopenq->max_qlen : |
0a672f74 | 2050 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) |
1da177e4 LT |
2051 | ); |
2052 | } | |
2053 | ||
1ab1457c | 2054 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 2055 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 2056 | { |
789f558c | 2057 | long delta = tw->tw_timer.expires - jiffies; |
b71d1d42 | 2058 | const struct in6_addr *dest, *src; |
1da177e4 | 2059 | __u16 destp, srcp; |
1da177e4 | 2060 | |
efe4208f ED |
2061 | dest = &tw->tw_v6_daddr; |
2062 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
2063 | destp = ntohs(tw->tw_dport); |
2064 | srcp = ntohs(tw->tw_sport); | |
2065 | ||
2066 | seq_printf(seq, | |
2067 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 2068 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
2069 | i, |
2070 | src->s6_addr32[0], src->s6_addr32[1], | |
2071 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2072 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2073 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2074 | tw->tw_substate, 0, 0, | |
a399a805 | 2075 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
41c6d650 | 2076 | refcount_read(&tw->tw_refcnt), tw); |
1da177e4 LT |
2077 | } |
2078 | ||
1da177e4 LT |
2079 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
2080 | { | |
2081 | struct tcp_iter_state *st; | |
05dbc7b5 | 2082 | struct sock *sk = v; |
1da177e4 LT |
2083 | |
2084 | if (v == SEQ_START_TOKEN) { | |
2085 | seq_puts(seq, | |
2086 | " sl " | |
2087 | "local_address " | |
2088 | "remote_address " | |
2089 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2090 | " uid timeout inode\n"); | |
2091 | goto out; | |
2092 | } | |
2093 | st = seq->private; | |
2094 | ||
079096f1 ED |
2095 | if (sk->sk_state == TCP_TIME_WAIT) |
2096 | get_timewait6_sock(seq, v, st->num); | |
2097 | else if (sk->sk_state == TCP_NEW_SYN_RECV) | |
aa3a0c8c | 2098 | get_openreq6(seq, v, st->num); |
079096f1 ED |
2099 | else |
2100 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
2101 | out: |
2102 | return 0; | |
2103 | } | |
2104 | ||
37d849bb CH |
2105 | static const struct seq_operations tcp6_seq_ops = { |
2106 | .show = tcp6_seq_show, | |
2107 | .start = tcp_seq_start, | |
2108 | .next = tcp_seq_next, | |
2109 | .stop = tcp_seq_stop, | |
2110 | }; | |
2111 | ||
1da177e4 | 2112 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 | 2113 | .family = AF_INET6, |
1da177e4 LT |
2114 | }; |
2115 | ||
2c8c1e72 | 2116 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 2117 | { |
c3506372 CH |
2118 | if (!proc_create_net_data("tcp6", 0444, net->proc_net, &tcp6_seq_ops, |
2119 | sizeof(struct tcp_iter_state), &tcp6_seq_afinfo)) | |
37d849bb CH |
2120 | return -ENOMEM; |
2121 | return 0; | |
1da177e4 LT |
2122 | } |
2123 | ||
6f8b13bc | 2124 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2125 | { |
37d849bb | 2126 | remove_proc_entry("tcp6", net->proc_net); |
1da177e4 LT |
2127 | } |
2128 | #endif | |
2129 | ||
2130 | struct proto tcpv6_prot = { | |
2131 | .name = "TCPv6", | |
2132 | .owner = THIS_MODULE, | |
2133 | .close = tcp_close, | |
d74bad4e | 2134 | .pre_connect = tcp_v6_pre_connect, |
1da177e4 LT |
2135 | .connect = tcp_v6_connect, |
2136 | .disconnect = tcp_disconnect, | |
463c84b9 | 2137 | .accept = inet_csk_accept, |
1da177e4 LT |
2138 | .ioctl = tcp_ioctl, |
2139 | .init = tcp_v6_init_sock, | |
2140 | .destroy = tcp_v6_destroy_sock, | |
2141 | .shutdown = tcp_shutdown, | |
2142 | .setsockopt = tcp_setsockopt, | |
2143 | .getsockopt = tcp_getsockopt, | |
9cacf81f | 2144 | .bpf_bypass_getsockopt = tcp_bpf_bypass_getsockopt, |
4b9d07a4 | 2145 | .keepalive = tcp_set_keepalive, |
1da177e4 | 2146 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
2147 | .sendmsg = tcp_sendmsg, |
2148 | .sendpage = tcp_sendpage, | |
1da177e4 | 2149 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 2150 | .release_cb = tcp_release_cb, |
496611d7 | 2151 | .hash = inet6_hash, |
ab1e0a13 ACM |
2152 | .unhash = inet_unhash, |
2153 | .get_port = inet_csk_get_port, | |
91a760b2 | 2154 | .put_port = inet_put_port, |
8a59f9d1 CW |
2155 | #ifdef CONFIG_BPF_SYSCALL |
2156 | .psock_update_sk_prot = tcp_bpf_update_proto, | |
2157 | #endif | |
1da177e4 | 2158 | .enter_memory_pressure = tcp_enter_memory_pressure, |
06044751 | 2159 | .leave_memory_pressure = tcp_leave_memory_pressure, |
c9bee3b7 | 2160 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
2161 | .sockets_allocated = &tcp_sockets_allocated, |
2162 | .memory_allocated = &tcp_memory_allocated, | |
2163 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2164 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 2165 | .sysctl_mem = sysctl_tcp_mem, |
356d1833 ED |
2166 | .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem), |
2167 | .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_tcp_rmem), | |
1da177e4 LT |
2168 | .max_header = MAX_TCP_HEADER, |
2169 | .obj_size = sizeof(struct tcp6_sock), | |
5f0d5a3a | 2170 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
6d6ee43e | 2171 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2172 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2173 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 2174 | .no_autobind = true, |
c1e64e29 | 2175 | .diag_destroy = tcp_abort, |
1da177e4 | 2176 | }; |
6abde0b2 | 2177 | EXPORT_SYMBOL_GPL(tcpv6_prot); |
1da177e4 | 2178 | |
a8e3bb34 DA |
2179 | /* thinking of making this const? Don't. |
2180 | * early_demux can change based on sysctl. | |
2181 | */ | |
39294c3d | 2182 | static struct inet6_protocol tcpv6_protocol = { |
c7109986 | 2183 | .early_demux = tcp_v6_early_demux, |
dddb64bc | 2184 | .early_demux_handler = tcp_v6_early_demux, |
1da177e4 LT |
2185 | .handler = tcp_v6_rcv, |
2186 | .err_handler = tcp_v6_err, | |
2187 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
2188 | }; | |
2189 | ||
1da177e4 LT |
2190 | static struct inet_protosw tcpv6_protosw = { |
2191 | .type = SOCK_STREAM, | |
2192 | .protocol = IPPROTO_TCP, | |
2193 | .prot = &tcpv6_prot, | |
2194 | .ops = &inet6_stream_ops, | |
d83d8461 ACM |
2195 | .flags = INET_PROTOSW_PERMANENT | |
2196 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2197 | }; |
2198 | ||
2c8c1e72 | 2199 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 2200 | { |
5677242f DL |
2201 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2202 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2203 | } |
2204 | ||
2c8c1e72 | 2205 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 2206 | { |
5677242f | 2207 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
2208 | } |
2209 | ||
93ec926b | 2210 | static struct pernet_operations tcpv6_net_ops = { |
b099ce26 EB |
2211 | .init = tcpv6_net_init, |
2212 | .exit = tcpv6_net_exit, | |
93ec926b DL |
2213 | }; |
2214 | ||
7f4e4868 | 2215 | int __init tcpv6_init(void) |
1da177e4 | 2216 | { |
7f4e4868 DL |
2217 | int ret; |
2218 | ||
3336288a VY |
2219 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
2220 | if (ret) | |
c6b641a4 | 2221 | goto out; |
3336288a | 2222 | |
1da177e4 | 2223 | /* register inet6 protocol */ |
7f4e4868 DL |
2224 | ret = inet6_register_protosw(&tcpv6_protosw); |
2225 | if (ret) | |
2226 | goto out_tcpv6_protocol; | |
2227 | ||
93ec926b | 2228 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2229 | if (ret) |
2230 | goto out_tcpv6_protosw; | |
f870fa0b MM |
2231 | |
2232 | ret = mptcpv6_init(); | |
2233 | if (ret) | |
2234 | goto out_tcpv6_pernet_subsys; | |
2235 | ||
7f4e4868 DL |
2236 | out: |
2237 | return ret; | |
ae0f7d5f | 2238 | |
f870fa0b MM |
2239 | out_tcpv6_pernet_subsys: |
2240 | unregister_pernet_subsys(&tcpv6_net_ops); | |
7f4e4868 DL |
2241 | out_tcpv6_protosw: |
2242 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
2243 | out_tcpv6_protocol: |
2244 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
2245 | goto out; |
2246 | } | |
2247 | ||
09f7709f | 2248 | void tcpv6_exit(void) |
7f4e4868 | 2249 | { |
93ec926b | 2250 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2251 | inet6_unregister_protosw(&tcpv6_protosw); |
2252 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2253 | } |