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> |
4ea0875b | 61 | #include <net/hotdata.h> |
076bb0c8 | 62 | #include <net/busy_poll.h> |
1da177e4 | 63 | |
1da177e4 LT |
64 | #include <linux/proc_fs.h> |
65 | #include <linux/seq_file.h> | |
66 | ||
cf80e0e4 | 67 | #include <crypto/hash.h> |
cfb6eeb4 YH |
68 | #include <linux/scatterlist.h> |
69 | ||
c24b14c4 SL |
70 | #include <trace/events/tcp.h> |
71 | ||
a00e7444 ED |
72 | static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb); |
73 | static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, | |
6edafaaf | 74 | struct request_sock *req); |
1da177e4 | 75 | |
d2489c7b | 76 | INDIRECT_CALLABLE_SCOPE int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); |
1da177e4 | 77 | |
3b401a81 | 78 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
35b2c321 | 79 | const struct inet_connection_sock_af_ops ipv6_specific; |
4954f17d | 80 | #if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) |
b2e4b3de SH |
81 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
82 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
a928630a | 83 | #endif |
1da177e4 | 84 | |
93a77c11 ED |
85 | /* Helper returning the inet6 address from a given tcp socket. |
86 | * It can be used in TCP stack instead of inet6_sk(sk). | |
87 | * This avoids a dereference and allow compiler optimizations. | |
f5d54767 | 88 | * It is a specialized version of inet6_sk_generic(). |
93a77c11 | 89 | */ |
fe79bd65 PB |
90 | #define tcp_inet6_sk(sk) (&container_of_const(tcp_sk(sk), \ |
91 | struct tcp6_sock, tcp)->inet6) | |
93a77c11 | 92 | |
fae6ef87 NC |
93 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
94 | { | |
95 | struct dst_entry *dst = skb_dst(skb); | |
fae6ef87 | 96 | |
5037e9ef | 97 | if (dst && dst_hold_safe(dst)) { |
ca777eff ED |
98 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
99 | ||
8f905c0e | 100 | rcu_assign_pointer(sk->sk_rx_dst, dst); |
0c0a5ef8 | 101 | sk->sk_rx_dst_ifindex = skb->skb_iif; |
ef57c161 | 102 | sk->sk_rx_dst_cookie = rt6_get_cookie(rt); |
ca777eff | 103 | } |
fae6ef87 NC |
104 | } |
105 | ||
84b114b9 | 106 | static u32 tcp_v6_init_seq(const struct sk_buff *skb) |
1da177e4 | 107 | { |
84b114b9 ED |
108 | return secure_tcpv6_seq(ipv6_hdr(skb)->daddr.s6_addr32, |
109 | ipv6_hdr(skb)->saddr.s6_addr32, | |
110 | tcp_hdr(skb)->dest, | |
111 | tcp_hdr(skb)->source); | |
112 | } | |
113 | ||
5d2ed052 | 114 | static u32 tcp_v6_init_ts_off(const struct net *net, const struct sk_buff *skb) |
84b114b9 | 115 | { |
5d2ed052 | 116 | return secure_tcpv6_ts_off(net, ipv6_hdr(skb)->daddr.s6_addr32, |
84b114b9 | 117 | ipv6_hdr(skb)->saddr.s6_addr32); |
1da177e4 LT |
118 | } |
119 | ||
d74bad4e AI |
120 | static int tcp_v6_pre_connect(struct sock *sk, struct sockaddr *uaddr, |
121 | int addr_len) | |
122 | { | |
123 | /* This check is replicated from tcp_v6_connect() and intended to | |
124 | * prevent BPF program called below from accessing bytes that are out | |
125 | * of the bound specified by user in addr_len. | |
126 | */ | |
127 | if (addr_len < SIN6_LEN_RFC2133) | |
128 | return -EINVAL; | |
129 | ||
130 | sock_owned_by_me(sk); | |
131 | ||
fefba7d1 | 132 | return BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr, &addr_len); |
d74bad4e AI |
133 | } |
134 | ||
1ab1457c | 135 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
136 | int addr_len) |
137 | { | |
138 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
d83d8461 | 139 | struct inet_connection_sock *icsk = inet_csk(sk); |
08eaef90 | 140 | struct in6_addr *saddr = NULL, *final_p, final; |
fbb82952 | 141 | struct inet_timewait_death_row *tcp_death_row; |
93a77c11 | 142 | struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
08eaef90 | 143 | struct inet_sock *inet = inet_sk(sk); |
1da177e4 | 144 | struct tcp_sock *tp = tcp_sk(sk); |
08eaef90 | 145 | struct net *net = sock_net(sk); |
45f6fad8 | 146 | struct ipv6_txoptions *opt; |
1da177e4 | 147 | struct dst_entry *dst; |
08eaef90 | 148 | struct flowi6 fl6; |
1da177e4 LT |
149 | int addr_type; |
150 | int err; | |
151 | ||
1ab1457c | 152 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
153 | return -EINVAL; |
154 | ||
1ab1457c | 155 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 156 | return -EAFNOSUPPORT; |
1da177e4 | 157 | |
4c9483b2 | 158 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 159 | |
859f8b26 | 160 | if (inet6_test_bit(SNDFLOW, sk)) { |
4c9483b2 DM |
161 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
162 | IP6_ECN_flow_init(fl6.flowlabel); | |
163 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 164 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 165 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
59c820b2 | 166 | if (IS_ERR(flowlabel)) |
1da177e4 | 167 | return -EINVAL; |
1da177e4 LT |
168 | fl6_sock_release(flowlabel); |
169 | } | |
170 | } | |
171 | ||
172 | /* | |
1ab1457c YH |
173 | * connect() to INADDR_ANY means loopback (BSD'ism). |
174 | */ | |
175 | ||
052d2369 JL |
176 | if (ipv6_addr_any(&usin->sin6_addr)) { |
177 | if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) | |
178 | ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), | |
179 | &usin->sin6_addr); | |
180 | else | |
181 | usin->sin6_addr = in6addr_loopback; | |
182 | } | |
1da177e4 LT |
183 | |
184 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
185 | ||
4c99aa40 | 186 | if (addr_type & IPV6_ADDR_MULTICAST) |
1da177e4 LT |
187 | return -ENETUNREACH; |
188 | ||
189 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
190 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
191 | usin->sin6_scope_id) { | |
192 | /* If interface is set while binding, indices | |
193 | * must coincide. | |
194 | */ | |
54dc3e33 | 195 | if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id)) |
1da177e4 LT |
196 | return -EINVAL; |
197 | ||
198 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
199 | } | |
200 | ||
201 | /* Connect to link-local address requires an interface */ | |
202 | if (!sk->sk_bound_dev_if) | |
203 | return -EINVAL; | |
204 | } | |
205 | ||
206 | if (tp->rx_opt.ts_recent_stamp && | |
efe4208f | 207 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
1da177e4 LT |
208 | tp->rx_opt.ts_recent = 0; |
209 | tp->rx_opt.ts_recent_stamp = 0; | |
0f317464 | 210 | WRITE_ONCE(tp->write_seq, 0); |
1da177e4 LT |
211 | } |
212 | ||
efe4208f | 213 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 214 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
215 | |
216 | /* | |
217 | * TCP over IPv4 | |
218 | */ | |
219 | ||
052d2369 | 220 | if (addr_type & IPV6_ADDR_MAPPED) { |
d83d8461 | 221 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
222 | struct sockaddr_in sin; |
223 | ||
89e9c728 | 224 | if (ipv6_only_sock(sk)) |
1da177e4 LT |
225 | return -ENETUNREACH; |
226 | ||
227 | sin.sin_family = AF_INET; | |
228 | sin.sin_port = usin->sin6_port; | |
229 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
230 | ||
f49cd2f4 KI |
231 | /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */ |
232 | WRITE_ONCE(icsk->icsk_af_ops, &ipv6_mapped); | |
cec37a6e | 233 | if (sk_is_mptcp(sk)) |
31484d56 | 234 | mptcpv6_handle_mapped(sk, true); |
1da177e4 | 235 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
4954f17d | 236 | #if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) |
cfb6eeb4 YH |
237 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; |
238 | #endif | |
1da177e4 LT |
239 | |
240 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
241 | ||
242 | if (err) { | |
d83d8461 | 243 | icsk->icsk_ext_hdr_len = exthdrlen; |
f49cd2f4 KI |
244 | /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */ |
245 | WRITE_ONCE(icsk->icsk_af_ops, &ipv6_specific); | |
cec37a6e | 246 | if (sk_is_mptcp(sk)) |
31484d56 | 247 | mptcpv6_handle_mapped(sk, false); |
1da177e4 | 248 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
4954f17d | 249 | #if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) |
cfb6eeb4 YH |
250 | tp->af_specific = &tcp_sock_ipv6_specific; |
251 | #endif | |
1da177e4 | 252 | goto failure; |
1da177e4 | 253 | } |
d1e559d0 | 254 | np->saddr = sk->sk_v6_rcv_saddr; |
1da177e4 LT |
255 | |
256 | return err; | |
257 | } | |
258 | ||
efe4208f ED |
259 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
260 | saddr = &sk->sk_v6_rcv_saddr; | |
1da177e4 | 261 | |
4c9483b2 | 262 | fl6.flowi6_proto = IPPROTO_TCP; |
efe4208f | 263 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 264 | fl6.saddr = saddr ? *saddr : np->saddr; |
8230680f | 265 | fl6.flowlabel = ip6_make_flowinfo(np->tclass, np->flow_label); |
4c9483b2 DM |
266 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
267 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
268 | fl6.fl6_dport = usin->sin6_port; |
269 | fl6.fl6_sport = inet->inet_sport; | |
e2d118a1 | 270 | fl6.flowi6_uid = sk->sk_uid; |
1da177e4 | 271 | |
1e1d04e6 | 272 | opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); |
45f6fad8 | 273 | final_p = fl6_update_dst(&fl6, opt, &final); |
1da177e4 | 274 | |
3df98d79 | 275 | security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6)); |
beb8d13b | 276 | |
08eaef90 | 277 | dst = ip6_dst_lookup_flow(net, sk, &fl6, final_p); |
68d0c6d3 DM |
278 | if (IS_ERR(dst)) { |
279 | err = PTR_ERR(dst); | |
1da177e4 | 280 | goto failure; |
14e50e57 | 281 | } |
1da177e4 | 282 | |
614e8316 | 283 | tp->tcp_usec_ts = dst_tcp_usec_ts(dst); |
4461568a KI |
284 | tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row; |
285 | ||
63159f29 | 286 | if (!saddr) { |
4c9483b2 | 287 | saddr = &fl6.saddr; |
8c5dae4c KI |
288 | |
289 | err = inet_bhash2_update_saddr(sk, saddr, AF_INET6); | |
290 | if (err) | |
291 | goto failure; | |
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)); | |
08eaef90 | 324 | tp->tsoffset = secure_tcpv6_ts_off(net, np->saddr.s6_addr32, |
84b114b9 | 325 | sk->sk_v6_daddr.s6_addr32); |
00355fa5 | 326 | } |
1da177e4 | 327 | |
19f6d3f3 WW |
328 | if (tcp_fastopen_defer_connect(sk, &err)) |
329 | return err; | |
330 | if (err) | |
331 | goto late_failure; | |
332 | ||
1da177e4 LT |
333 | err = tcp_connect(sk); |
334 | if (err) | |
335 | goto late_failure; | |
336 | ||
337 | return 0; | |
338 | ||
339 | late_failure: | |
340 | tcp_set_state(sk, TCP_CLOSE); | |
e0833d1f | 341 | inet_bhash2_reset_saddr(sk); |
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; | |
c7bb4b89 | 351 | u32 mtu; |
563d34d0 ED |
352 | |
353 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
354 | return; | |
355 | ||
c7bb4b89 ED |
356 | mtu = READ_ONCE(tcp_sk(sk)->mtu_info); |
357 | ||
358 | /* Drop requests trying to increase our current mss. | |
359 | * Check done in __ip6_rt_update_pmtu() is too late. | |
360 | */ | |
361 | if (tcp_mtu_to_mss(sk, mtu) >= tcp_sk(sk)->mss_cache) | |
362 | return; | |
363 | ||
364 | dst = inet6_csk_update_pmtu(sk, mtu); | |
563d34d0 ED |
365 | if (!dst) |
366 | return; | |
367 | ||
368 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
369 | tcp_sync_mss(sk, dst_mtu(dst)); | |
370 | tcp_simple_retransmit(sk); | |
371 | } | |
372 | } | |
373 | ||
32bbd879 | 374 | static int tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 375 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 376 | { |
4c99aa40 | 377 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
505cbfc5 | 378 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
2215089b ED |
379 | struct net *net = dev_net(skb->dev); |
380 | struct request_sock *fastopen; | |
1da177e4 | 381 | struct ipv6_pinfo *np; |
1ab1457c | 382 | struct tcp_sock *tp; |
0a672f74 | 383 | __u32 seq, snd_una; |
2215089b | 384 | struct sock *sk; |
b59db45d | 385 | bool fatal; |
2215089b | 386 | int err; |
1da177e4 | 387 | |
4461568a | 388 | sk = __inet6_lookup_established(net, net->ipv4.tcp_death_row.hashinfo, |
2215089b ED |
389 | &hdr->daddr, th->dest, |
390 | &hdr->saddr, ntohs(th->source), | |
4297a0ef | 391 | skb->dev->ifindex, inet6_sdif(skb)); |
1da177e4 | 392 | |
2215089b | 393 | if (!sk) { |
a16292a0 ED |
394 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
395 | ICMP6_MIB_INERRORS); | |
32bbd879 | 396 | return -ENOENT; |
1da177e4 LT |
397 | } |
398 | ||
399 | if (sk->sk_state == TCP_TIME_WAIT) { | |
953af8e3 DS |
400 | /* To increase the counter of ignored icmps for TCP-AO */ |
401 | tcp_ao_ignore_icmp(sk, AF_INET6, type, code); | |
9469c7b4 | 402 | inet_twsk_put(inet_twsk(sk)); |
32bbd879 | 403 | return 0; |
1da177e4 | 404 | } |
2215089b | 405 | seq = ntohl(th->seq); |
b59db45d | 406 | fatal = icmpv6_err_convert(type, code, &err); |
32bbd879 | 407 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
b59db45d | 408 | tcp_req_err(sk, seq, fatal); |
32bbd879 SB |
409 | return 0; |
410 | } | |
1da177e4 | 411 | |
953af8e3 DS |
412 | if (tcp_ao_ignore_icmp(sk, AF_INET6, type, code)) { |
413 | sock_put(sk); | |
414 | return 0; | |
415 | } | |
416 | ||
1da177e4 | 417 | bh_lock_sock(sk); |
563d34d0 | 418 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
02a1d6e7 | 419 | __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
420 | |
421 | if (sk->sk_state == TCP_CLOSE) | |
422 | goto out; | |
423 | ||
790eb673 ED |
424 | if (static_branch_unlikely(&ip6_min_hopcount)) { |
425 | /* min_hopcount can be changed concurrently from do_ipv6_setsockopt() */ | |
426 | if (ipv6_hdr(skb)->hop_limit < READ_ONCE(tcp_inet6_sk(sk)->min_hopcount)) { | |
427 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); | |
428 | goto out; | |
429 | } | |
e802af9c SH |
430 | } |
431 | ||
1da177e4 | 432 | tp = tcp_sk(sk); |
0a672f74 | 433 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
d983ea6f | 434 | fastopen = rcu_dereference(tp->fastopen_rsk); |
0a672f74 | 435 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; |
1da177e4 | 436 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 437 | !between(seq, snd_una, tp->snd_nxt)) { |
02a1d6e7 | 438 | __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
439 | goto out; |
440 | } | |
441 | ||
93a77c11 | 442 | np = tcp_inet6_sk(sk); |
1da177e4 | 443 | |
ec18d9a2 | 444 | if (type == NDISC_REDIRECT) { |
45caeaa5 JM |
445 | if (!sock_owned_by_user(sk)) { |
446 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
ec18d9a2 | 447 | |
45caeaa5 JM |
448 | if (dst) |
449 | dst->ops->redirect(dst, sk, skb); | |
450 | } | |
50a75a89 | 451 | goto out; |
ec18d9a2 DM |
452 | } |
453 | ||
1da177e4 | 454 | if (type == ICMPV6_PKT_TOOBIG) { |
c7bb4b89 ED |
455 | u32 mtu = ntohl(info); |
456 | ||
0d4f0608 ED |
457 | /* We are not interested in TCP_LISTEN and open_requests |
458 | * (SYN-ACKs send out by Linux are always <576bytes so | |
459 | * they should go through unfragmented). | |
460 | */ | |
461 | if (sk->sk_state == TCP_LISTEN) | |
462 | goto out; | |
463 | ||
93b36cf3 HFS |
464 | if (!ip6_sk_accept_pmtu(sk)) |
465 | goto out; | |
466 | ||
c7bb4b89 ED |
467 | if (mtu < IPV6_MIN_MTU) |
468 | goto out; | |
469 | ||
470 | WRITE_ONCE(tp->mtu_info, mtu); | |
471 | ||
563d34d0 ED |
472 | if (!sock_owned_by_user(sk)) |
473 | tcp_v6_mtu_reduced(sk); | |
d013ef2a | 474 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
7aa5470c | 475 | &sk->sk_tsq_flags)) |
d013ef2a | 476 | sock_hold(sk); |
1da177e4 LT |
477 | goto out; |
478 | } | |
479 | ||
1da177e4 | 480 | |
60236fdd | 481 | /* Might be for an request_sock */ |
1da177e4 | 482 | switch (sk->sk_state) { |
1da177e4 | 483 | case TCP_SYN_SENT: |
0a672f74 YC |
484 | case TCP_SYN_RECV: |
485 | /* Only in fast or simultaneous open. If a fast open socket is | |
634a63e7 | 486 | * already accepted it is treated as a connected one below. |
0a672f74 | 487 | */ |
63159f29 | 488 | if (fastopen && !fastopen->sk) |
0a672f74 YC |
489 | break; |
490 | ||
45af29ca ED |
491 | ipv6_icmp_error(sk, skb, err, th->dest, ntohl(info), (u8 *)th); |
492 | ||
1da177e4 | 493 | if (!sock_owned_by_user(sk)) { |
e13ec3da | 494 | WRITE_ONCE(sk->sk_err, err); |
e3ae2365 | 495 | sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ |
1da177e4 LT |
496 | |
497 | tcp_done(sk); | |
cee1af82 ED |
498 | } else { |
499 | WRITE_ONCE(sk->sk_err_soft, err); | |
500 | } | |
1da177e4 | 501 | goto out; |
d2924569 ED |
502 | case TCP_LISTEN: |
503 | break; | |
504 | default: | |
505 | /* check if this ICMP message allows revert of backoff. | |
506 | * (see RFC 6069) | |
507 | */ | |
508 | if (!fastopen && type == ICMPV6_DEST_UNREACH && | |
509 | code == ICMPV6_NOROUTE) | |
510 | tcp_ld_RTO_revert(sk, seq); | |
1da177e4 LT |
511 | } |
512 | ||
3fa29971 | 513 | if (!sock_owned_by_user(sk) && inet6_test_bit(RECVERR6, sk)) { |
e13ec3da | 514 | WRITE_ONCE(sk->sk_err, err); |
e3ae2365 | 515 | sk_error_report(sk); |
cee1af82 ED |
516 | } else { |
517 | WRITE_ONCE(sk->sk_err_soft, err); | |
518 | } | |
1da177e4 LT |
519 | out: |
520 | bh_unlock_sock(sk); | |
521 | sock_put(sk); | |
32bbd879 | 522 | return 0; |
1da177e4 LT |
523 | } |
524 | ||
525 | ||
0f935dbe | 526 | static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst, |
d6274bd8 | 527 | struct flowi *fl, |
3840a06e | 528 | struct request_sock *req, |
ca6fb065 | 529 | struct tcp_fastopen_cookie *foc, |
331fca43 MKL |
530 | enum tcp_synack_type synack_type, |
531 | struct sk_buff *syn_skb) | |
1da177e4 | 532 | { |
634fb979 | 533 | struct inet_request_sock *ireq = inet_rsk(req); |
fe79bd65 | 534 | const struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
56ac42bc | 535 | struct ipv6_txoptions *opt; |
d6274bd8 | 536 | struct flowi6 *fl6 = &fl->u.ip6; |
4c99aa40 | 537 | struct sk_buff *skb; |
9494218f | 538 | int err = -ENOMEM; |
ac8f1710 | 539 | u8 tclass; |
1da177e4 | 540 | |
9f10d3f6 | 541 | /* First, grab a route. */ |
f76b33c3 ED |
542 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req, |
543 | IPPROTO_TCP)) == NULL) | |
fd80eb94 | 544 | goto done; |
9494218f | 545 | |
331fca43 | 546 | skb = tcp_make_synack(sk, dst, req, foc, synack_type, syn_skb); |
9494218f | 547 | |
1da177e4 | 548 | if (skb) { |
634fb979 ED |
549 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
550 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 551 | |
634fb979 | 552 | fl6->daddr = ireq->ir_v6_rmt_addr; |
3cccda8d | 553 | if (inet6_test_bit(REPFLOW, sk) && ireq->pktopts) |
df3687ff FF |
554 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); |
555 | ||
870e3a63 | 556 | tclass = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_reflect_tos) ? |
8ef44b6f WW |
557 | (tcp_rsk(req)->syn_tos & ~INET_ECN_MASK) | |
558 | (np->tclass & INET_ECN_MASK) : | |
861602b5 | 559 | np->tclass; |
407c85c7 AD |
560 | |
561 | if (!INET_ECN_is_capable(tclass) && | |
562 | tcp_bpf_ca_needs_ecn((struct sock *)req)) | |
563 | tclass |= INET_ECN_ECT_0; | |
564 | ||
565 | rcu_read_lock(); | |
566 | opt = ireq->ipv6_opt; | |
56ac42bc HD |
567 | if (!opt) |
568 | opt = rcu_dereference(np->opt); | |
3c5b4d69 | 569 | err = ip6_xmit(sk, skb, fl6, skb->mark ? : READ_ONCE(sk->sk_mark), |
10bbf165 | 570 | opt, tclass, READ_ONCE(sk->sk_priority)); |
3e4006f0 | 571 | rcu_read_unlock(); |
b9df3cb8 | 572 | err = net_xmit_eval(err); |
1da177e4 LT |
573 | } |
574 | ||
575 | done: | |
1da177e4 LT |
576 | return err; |
577 | } | |
578 | ||
72659ecc | 579 | |
60236fdd | 580 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 581 | { |
56ac42bc | 582 | kfree(inet_rsk(req)->ipv6_opt); |
12c8691d | 583 | consume_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
584 | } |
585 | ||
cfb6eeb4 | 586 | #ifdef CONFIG_TCP_MD5SIG |
b83e3deb | 587 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk, |
dea53bb8 DA |
588 | const struct in6_addr *addr, |
589 | int l3index) | |
cfb6eeb4 | 590 | { |
dea53bb8 DA |
591 | return tcp_md5_do_lookup(sk, l3index, |
592 | (union tcp_md5_addr *)addr, AF_INET6); | |
cfb6eeb4 YH |
593 | } |
594 | ||
b83e3deb | 595 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk, |
fd3a154a | 596 | const struct sock *addr_sk) |
cfb6eeb4 | 597 | { |
dea53bb8 DA |
598 | int l3index; |
599 | ||
600 | l3index = l3mdev_master_ifindex_by_index(sock_net(sk), | |
601 | addr_sk->sk_bound_dev_if); | |
602 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr, | |
603 | l3index); | |
cfb6eeb4 YH |
604 | } |
605 | ||
8917a777 | 606 | static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, |
d4c19c49 | 607 | sockptr_t optval, int optlen) |
cfb6eeb4 YH |
608 | { |
609 | struct tcp_md5sig cmd; | |
610 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
0aadc739 | 611 | union tcp_ao_addr *addr; |
dea53bb8 | 612 | int l3index = 0; |
8917a777 | 613 | u8 prefixlen; |
248411b8 | 614 | bool l3flag; |
a76c2315 | 615 | u8 flags; |
cfb6eeb4 YH |
616 | |
617 | if (optlen < sizeof(cmd)) | |
618 | return -EINVAL; | |
619 | ||
d4c19c49 | 620 | if (copy_from_sockptr(&cmd, optval, sizeof(cmd))) |
cfb6eeb4 YH |
621 | return -EFAULT; |
622 | ||
623 | if (sin6->sin6_family != AF_INET6) | |
624 | return -EINVAL; | |
625 | ||
a76c2315 | 626 | flags = cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX; |
248411b8 | 627 | l3flag = cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX; |
a76c2315 | 628 | |
8917a777 ID |
629 | if (optname == TCP_MD5SIG_EXT && |
630 | cmd.tcpm_flags & TCP_MD5SIG_FLAG_PREFIX) { | |
631 | prefixlen = cmd.tcpm_prefixlen; | |
632 | if (prefixlen > 128 || (ipv6_addr_v4mapped(&sin6->sin6_addr) && | |
633 | prefixlen > 32)) | |
634 | return -EINVAL; | |
635 | } else { | |
636 | prefixlen = ipv6_addr_v4mapped(&sin6->sin6_addr) ? 32 : 128; | |
637 | } | |
638 | ||
a76c2315 | 639 | if (optname == TCP_MD5SIG_EXT && cmd.tcpm_ifindex && |
6b102db5 DA |
640 | cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX) { |
641 | struct net_device *dev; | |
642 | ||
643 | rcu_read_lock(); | |
644 | dev = dev_get_by_index_rcu(sock_net(sk), cmd.tcpm_ifindex); | |
645 | if (dev && netif_is_l3_master(dev)) | |
646 | l3index = dev->ifindex; | |
647 | rcu_read_unlock(); | |
648 | ||
649 | /* ok to reference set/not set outside of rcu; | |
650 | * right now device MUST be an L3 master | |
651 | */ | |
652 | if (!dev || !l3index) | |
653 | return -EINVAL; | |
654 | } | |
655 | ||
cfb6eeb4 | 656 | if (!cmd.tcpm_keylen) { |
e773e4fa | 657 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b | 658 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
6b102db5 | 659 | AF_INET, prefixlen, |
a76c2315 | 660 | l3index, flags); |
a915da9b | 661 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
a76c2315 | 662 | AF_INET6, prefixlen, l3index, flags); |
cfb6eeb4 YH |
663 | } |
664 | ||
665 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
666 | return -EINVAL; | |
667 | ||
0aadc739 DS |
668 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { |
669 | addr = (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3]; | |
670 | ||
671 | /* Don't allow keys for peers that have a matching TCP-AO key. | |
672 | * See the comment in tcp_ao_add_cmd() | |
673 | */ | |
248411b8 DS |
674 | if (tcp_ao_required(sk, addr, AF_INET, |
675 | l3flag ? l3index : -1, false)) | |
0aadc739 DS |
676 | return -EKEYREJECTED; |
677 | return tcp_md5_do_add(sk, addr, | |
a76c2315 | 678 | AF_INET, prefixlen, l3index, flags, |
459837b5 | 679 | cmd.tcpm_key, cmd.tcpm_keylen); |
0aadc739 DS |
680 | } |
681 | ||
682 | addr = (union tcp_md5_addr *)&sin6->sin6_addr; | |
683 | ||
684 | /* Don't allow keys for peers that have a matching TCP-AO key. | |
685 | * See the comment in tcp_ao_add_cmd() | |
686 | */ | |
248411b8 | 687 | if (tcp_ao_required(sk, addr, AF_INET6, l3flag ? l3index : -1, false)) |
0aadc739 | 688 | return -EKEYREJECTED; |
cfb6eeb4 | 689 | |
0aadc739 | 690 | return tcp_md5_do_add(sk, addr, AF_INET6, prefixlen, l3index, flags, |
459837b5 | 691 | cmd.tcpm_key, cmd.tcpm_keylen); |
cfb6eeb4 YH |
692 | } |
693 | ||
8c73b263 | 694 | static int tcp_v6_md5_hash_headers(struct tcp_sigpool *hp, |
19689e38 ED |
695 | const struct in6_addr *daddr, |
696 | const struct in6_addr *saddr, | |
697 | const struct tcphdr *th, int nbytes) | |
cfb6eeb4 | 698 | { |
cfb6eeb4 | 699 | struct tcp6_pseudohdr *bp; |
49a72dfb | 700 | struct scatterlist sg; |
19689e38 | 701 | struct tcphdr *_th; |
8d26d76d | 702 | |
19689e38 | 703 | bp = hp->scratch; |
cfb6eeb4 | 704 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
705 | bp->saddr = *saddr; |
706 | bp->daddr = *daddr; | |
49a72dfb | 707 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 708 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 709 | |
19689e38 ED |
710 | _th = (struct tcphdr *)(bp + 1); |
711 | memcpy(_th, th, sizeof(*th)); | |
712 | _th->check = 0; | |
713 | ||
714 | sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th)); | |
8c73b263 | 715 | ahash_request_set_crypt(hp->req, &sg, NULL, |
19689e38 | 716 | sizeof(*bp) + sizeof(*th)); |
8c73b263 | 717 | return crypto_ahash_update(hp->req); |
49a72dfb | 718 | } |
c7da57a1 | 719 | |
19689e38 | 720 | static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, |
b71d1d42 | 721 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 722 | const struct tcphdr *th) |
49a72dfb | 723 | { |
8c73b263 | 724 | struct tcp_sigpool hp; |
49a72dfb | 725 | |
8c73b263 DS |
726 | if (tcp_sigpool_start(tcp_md5_sigpool_id, &hp)) |
727 | goto clear_hash_nostart; | |
49a72dfb | 728 | |
8c73b263 | 729 | if (crypto_ahash_init(hp.req)) |
49a72dfb | 730 | goto clear_hash; |
8c73b263 | 731 | if (tcp_v6_md5_hash_headers(&hp, daddr, saddr, th, th->doff << 2)) |
49a72dfb | 732 | goto clear_hash; |
8c73b263 | 733 | if (tcp_md5_hash_key(&hp, key)) |
49a72dfb | 734 | goto clear_hash; |
8c73b263 DS |
735 | ahash_request_set_crypt(hp.req, NULL, md5_hash, 0); |
736 | if (crypto_ahash_final(hp.req)) | |
cfb6eeb4 | 737 | goto clear_hash; |
cfb6eeb4 | 738 | |
8c73b263 | 739 | tcp_sigpool_end(&hp); |
cfb6eeb4 | 740 | return 0; |
49a72dfb | 741 | |
cfb6eeb4 | 742 | clear_hash: |
8c73b263 DS |
743 | tcp_sigpool_end(&hp); |
744 | clear_hash_nostart: | |
cfb6eeb4 | 745 | memset(md5_hash, 0, 16); |
49a72dfb | 746 | return 1; |
cfb6eeb4 YH |
747 | } |
748 | ||
39f8e58e ED |
749 | static int tcp_v6_md5_hash_skb(char *md5_hash, |
750 | const struct tcp_md5sig_key *key, | |
318cf7aa | 751 | const struct sock *sk, |
318cf7aa | 752 | const struct sk_buff *skb) |
cfb6eeb4 | 753 | { |
318cf7aa | 754 | const struct tcphdr *th = tcp_hdr(skb); |
8c73b263 DS |
755 | const struct in6_addr *saddr, *daddr; |
756 | struct tcp_sigpool hp; | |
cfb6eeb4 | 757 | |
39f8e58e ED |
758 | if (sk) { /* valid for establish/request sockets */ |
759 | saddr = &sk->sk_v6_rcv_saddr; | |
efe4208f | 760 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 761 | } else { |
b71d1d42 | 762 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
763 | saddr = &ip6h->saddr; |
764 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 765 | } |
49a72dfb | 766 | |
8c73b263 DS |
767 | if (tcp_sigpool_start(tcp_md5_sigpool_id, &hp)) |
768 | goto clear_hash_nostart; | |
49a72dfb | 769 | |
8c73b263 | 770 | if (crypto_ahash_init(hp.req)) |
49a72dfb AL |
771 | goto clear_hash; |
772 | ||
8c73b263 | 773 | if (tcp_v6_md5_hash_headers(&hp, daddr, saddr, th, skb->len)) |
49a72dfb | 774 | goto clear_hash; |
8c73b263 | 775 | if (tcp_sigpool_hash_skb_data(&hp, skb, th->doff << 2)) |
49a72dfb | 776 | goto clear_hash; |
8c73b263 | 777 | if (tcp_md5_hash_key(&hp, key)) |
49a72dfb | 778 | goto clear_hash; |
8c73b263 DS |
779 | ahash_request_set_crypt(hp.req, NULL, md5_hash, 0); |
780 | if (crypto_ahash_final(hp.req)) | |
49a72dfb AL |
781 | goto clear_hash; |
782 | ||
8c73b263 | 783 | tcp_sigpool_end(&hp); |
49a72dfb AL |
784 | return 0; |
785 | ||
786 | clear_hash: | |
8c73b263 DS |
787 | tcp_sigpool_end(&hp); |
788 | clear_hash_nostart: | |
49a72dfb AL |
789 | memset(md5_hash, 0, 16); |
790 | return 1; | |
cfb6eeb4 | 791 | } |
ba8e275a ED |
792 | #endif |
793 | ||
b40cf18e ED |
794 | static void tcp_v6_init_req(struct request_sock *req, |
795 | const struct sock *sk_listener, | |
16bea70a OP |
796 | struct sk_buff *skb) |
797 | { | |
c2027d1e | 798 | bool l3_slave = ipv6_l3mdev_skb(TCP_SKB_CB(skb)->header.h6.flags); |
16bea70a | 799 | struct inet_request_sock *ireq = inet_rsk(req); |
93a77c11 | 800 | const struct ipv6_pinfo *np = tcp_inet6_sk(sk_listener); |
16bea70a OP |
801 | |
802 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
803 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
804 | ||
16bea70a | 805 | /* So that link locals have meaning */ |
c2027d1e | 806 | if ((!sk_listener->sk_bound_dev_if || l3_slave) && |
16bea70a | 807 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
870c3151 | 808 | ireq->ir_iif = tcp_v6_iif(skb); |
16bea70a | 809 | |
04317daf | 810 | if (!TCP_SKB_CB(skb)->tcp_tw_isn && |
b40cf18e | 811 | (ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) || |
a224772d | 812 | np->rxopt.bits.rxinfo || |
16bea70a | 813 | np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim || |
3cccda8d | 814 | np->rxopt.bits.rxohlim || inet6_test_bit(REPFLOW, sk_listener))) { |
63354797 | 815 | refcount_inc(&skb->users); |
16bea70a OP |
816 | ireq->pktopts = skb; |
817 | } | |
818 | } | |
819 | ||
f964629e | 820 | static struct dst_entry *tcp_v6_route_req(const struct sock *sk, |
7ea851d1 | 821 | struct sk_buff *skb, |
f964629e | 822 | struct flowi *fl, |
7ea851d1 | 823 | struct request_sock *req) |
d94e0417 | 824 | { |
7ea851d1 FW |
825 | tcp_v6_init_req(req, sk, skb); |
826 | ||
827 | if (security_inet_conn_request(sk, skb, req)) | |
828 | return NULL; | |
829 | ||
f76b33c3 | 830 | return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP); |
d94e0417 OP |
831 | } |
832 | ||
c6aefafb | 833 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 834 | .family = AF_INET6, |
2e6599cb | 835 | .obj_size = sizeof(struct tcp6_request_sock), |
5db92c99 | 836 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
837 | .send_ack = tcp_v6_reqsk_send_ack, |
838 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 839 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 840 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
841 | }; |
842 | ||
35b2c321 | 843 | const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
2aec4a29 OP |
844 | .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - |
845 | sizeof(struct ipv6hdr), | |
16bea70a | 846 | #ifdef CONFIG_TCP_MD5SIG |
fd3a154a | 847 | .req_md5_lookup = tcp_v6_md5_lookup, |
e3afe7b7 | 848 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
b6332e6c | 849 | #endif |
06b22ef2 DS |
850 | #ifdef CONFIG_TCP_AO |
851 | .ao_lookup = tcp_v6_ao_lookup_rsk, | |
852 | .ao_calc_key = tcp_v6_ao_calc_key_rsk, | |
9427c6aa | 853 | .ao_synack_hash = tcp_v6_ao_synack_hash, |
06b22ef2 | 854 | #endif |
fb7b37a7 OP |
855 | #ifdef CONFIG_SYN_COOKIES |
856 | .cookie_init_seq = cookie_v6_init_sequence, | |
857 | #endif | |
d94e0417 | 858 | .route_req = tcp_v6_route_req, |
84b114b9 ED |
859 | .init_seq = tcp_v6_init_seq, |
860 | .init_ts_off = tcp_v6_init_ts_off, | |
d6274bd8 | 861 | .send_synack = tcp_v6_send_synack, |
16bea70a | 862 | }; |
cfb6eeb4 | 863 | |
a00e7444 | 864 | static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae | 865 | u32 ack, u32 win, u32 tsval, u32 tsecr, |
ba7783ad DS |
866 | int oif, int rst, u8 tclass, __be32 label, |
867 | u32 priority, u32 txhash, struct tcp_key *key) | |
1da177e4 | 868 | { |
cf533ea5 ED |
869 | const struct tcphdr *th = tcp_hdr(skb); |
870 | struct tcphdr *t1; | |
1da177e4 | 871 | struct sk_buff *buff; |
4c9483b2 | 872 | struct flowi6 fl6; |
0f85feae | 873 | struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
e5047992 | 874 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 875 | unsigned int tot_len = sizeof(struct tcphdr); |
dc87efdb | 876 | __be32 mrst = 0, *topt; |
adf30907 | 877 | struct dst_entry *dst; |
00483690 | 878 | __u32 mark = 0; |
1da177e4 | 879 | |
ee684b6f | 880 | if (tsecr) |
626e264d | 881 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
ba7783ad | 882 | if (tcp_key_is_md5(key)) |
cfb6eeb4 | 883 | tot_len += TCPOLEN_MD5SIG_ALIGNED; |
ba7783ad | 884 | if (tcp_key_is_ao(key)) |
da7dfaa6 | 885 | tot_len += tcp_ao_len_aligned(key->ao_key); |
cfb6eeb4 | 886 | |
dc87efdb | 887 | #ifdef CONFIG_MPTCP |
ba7783ad | 888 | if (rst && !tcp_key_is_md5(key)) { |
dc87efdb FW |
889 | mrst = mptcp_reset_option(skb); |
890 | ||
891 | if (mrst) | |
892 | tot_len += sizeof(__be32); | |
893 | } | |
894 | #endif | |
895 | ||
0ebea8f9 | 896 | buff = alloc_skb(MAX_TCP_HEADER, GFP_ATOMIC); |
63159f29 | 897 | if (!buff) |
1ab1457c | 898 | return; |
1da177e4 | 899 | |
0ebea8f9 | 900 | skb_reserve(buff, MAX_TCP_HEADER); |
1da177e4 | 901 | |
d58ff351 | 902 | t1 = skb_push(buff, tot_len); |
6651ffc8 | 903 | skb_reset_transport_header(buff); |
1da177e4 LT |
904 | |
905 | /* Swap the send and the receive. */ | |
906 | memset(t1, 0, sizeof(*t1)); | |
907 | t1->dest = th->source; | |
908 | t1->source = th->dest; | |
cfb6eeb4 | 909 | t1->doff = tot_len / 4; |
626e264d IJ |
910 | t1->seq = htonl(seq); |
911 | t1->ack_seq = htonl(ack); | |
912 | t1->ack = !rst || !th->ack; | |
913 | t1->rst = rst; | |
914 | t1->window = htons(win); | |
1da177e4 | 915 | |
81ada62d IJ |
916 | topt = (__be32 *)(t1 + 1); |
917 | ||
ee684b6f | 918 | if (tsecr) { |
626e264d IJ |
919 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
920 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
921 | *topt++ = htonl(tsval); |
922 | *topt++ = htonl(tsecr); | |
626e264d IJ |
923 | } |
924 | ||
dc87efdb FW |
925 | if (mrst) |
926 | *topt++ = mrst; | |
927 | ||
cfb6eeb4 | 928 | #ifdef CONFIG_TCP_MD5SIG |
ba7783ad | 929 | if (tcp_key_is_md5(key)) { |
81ada62d IJ |
930 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
931 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
ba7783ad | 932 | tcp_v6_md5_hash_hdr((__u8 *)topt, key->md5_key, |
78e645cb IJ |
933 | &ipv6_hdr(skb)->saddr, |
934 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
935 | } |
936 | #endif | |
ba7783ad DS |
937 | #ifdef CONFIG_TCP_AO |
938 | if (tcp_key_is_ao(key)) { | |
939 | *topt++ = htonl((TCPOPT_AO << 24) | | |
940 | (tcp_ao_len(key->ao_key) << 16) | | |
941 | (key->ao_key->sndid << 8) | | |
942 | (key->rcv_next)); | |
943 | ||
944 | tcp_ao_hash_hdr(AF_INET6, (char *)topt, key->ao_key, | |
945 | key->traffic_key, | |
946 | (union tcp_ao_addr *)&ipv6_hdr(skb)->saddr, | |
947 | (union tcp_ao_addr *)&ipv6_hdr(skb)->daddr, | |
948 | t1, key->sne); | |
949 | } | |
950 | #endif | |
cfb6eeb4 | 951 | |
4c9483b2 | 952 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
953 | fl6.daddr = ipv6_hdr(skb)->saddr; |
954 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 955 | fl6.flowlabel = label; |
1da177e4 | 956 | |
e5700aff | 957 | buff->ip_summed = CHECKSUM_PARTIAL; |
e5700aff | 958 | |
4c9483b2 | 959 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 960 | |
4c9483b2 | 961 | fl6.flowi6_proto = IPPROTO_TCP; |
a36dbdb2 | 962 | if (rt6_need_strict(&fl6.daddr) && !oif) |
870c3151 | 963 | fl6.flowi6_oif = tcp_v6_iif(skb); |
9b6c14d5 DA |
964 | else { |
965 | if (!oif && netif_index_is_l3_master(net, skb->skb_iif)) | |
966 | oif = skb->skb_iif; | |
967 | ||
968 | fl6.flowi6_oif = oif; | |
969 | } | |
1d2f7b2d | 970 | |
c67b8555 | 971 | if (sk) { |
aa51b80e | 972 | if (sk->sk_state == TCP_TIME_WAIT) |
c67b8555 | 973 | mark = inet_twsk(sk)->tw_mark; |
aa51b80e | 974 | else |
3c5b4d69 | 975 | mark = READ_ONCE(sk->sk_mark); |
a1ac9c8a | 976 | skb_set_delivery_time(buff, tcp_transmit_time(sk), true); |
c67b8555 | 977 | } |
aa51b80e ED |
978 | if (txhash) { |
979 | /* autoflowlabel/skb_get_hash_flowi6 rely on buff->hash */ | |
980 | skb_set_hash(buff, txhash, PKT_HASH_TYPE_L4); | |
981 | } | |
00483690 | 982 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark) ?: mark; |
1958b856 DM |
983 | fl6.fl6_dport = t1->dest; |
984 | fl6.fl6_sport = t1->source; | |
e2d118a1 | 985 | fl6.flowi6_uid = sock_net_uid(net, sk && sk_fullsock(sk) ? sk : NULL); |
3df98d79 | 986 | security_skb_classify_flow(skb, flowi6_to_flowi_common(&fl6)); |
1da177e4 | 987 | |
c20121ae DL |
988 | /* Pass a socket to ip6_dst_lookup either it is for RST |
989 | * Underlying function will use this to retrieve the network | |
990 | * namespace | |
991 | */ | |
e22aa148 | 992 | if (sk && sk->sk_state != TCP_TIME_WAIT) |
993 | dst = ip6_dst_lookup_flow(net, sk, &fl6, NULL); /*sk's xfrm_policy can be referred*/ | |
994 | else | |
995 | dst = ip6_dst_lookup_flow(net, ctl_sk, &fl6, NULL); | |
68d0c6d3 DM |
996 | if (!IS_ERR(dst)) { |
997 | skb_dst_set(buff, dst); | |
e92dd77e WW |
998 | ip6_xmit(ctl_sk, buff, &fl6, fl6.flowi6_mark, NULL, |
999 | tclass & ~INET_ECN_MASK, priority); | |
c10d9310 | 1000 | TCP_INC_STATS(net, TCP_MIB_OUTSEGS); |
68d0c6d3 | 1001 | if (rst) |
c10d9310 | 1002 | TCP_INC_STATS(net, TCP_MIB_OUTRSTS); |
68d0c6d3 | 1003 | return; |
1da177e4 LT |
1004 | } |
1005 | ||
1006 | kfree_skb(buff); | |
1007 | } | |
1008 | ||
a00e7444 | 1009 | static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1010 | { |
cf533ea5 | 1011 | const struct tcphdr *th = tcp_hdr(skb); |
323a53c4 | 1012 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
f7dca36f | 1013 | const __u8 *md5_hash_location = NULL; |
ba7783ad DS |
1014 | #if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) |
1015 | bool allocated_traffic_key = false; | |
658ddaaf | 1016 | #endif |
ba7783ad DS |
1017 | const struct tcp_ao_hdr *aoh; |
1018 | struct tcp_key key = {}; | |
1019 | u32 seq = 0, ack_seq = 0; | |
323a53c4 | 1020 | __be32 label = 0; |
e9a5dcee | 1021 | u32 priority = 0; |
323a53c4 | 1022 | struct net *net; |
9258b8b1 | 1023 | u32 txhash = 0; |
c24b14c4 | 1024 | int oif = 0; |
ba7783ad DS |
1025 | #ifdef CONFIG_TCP_MD5SIG |
1026 | unsigned char newhash[16]; | |
1027 | int genhash; | |
1028 | struct sock *sk1 = NULL; | |
1029 | #endif | |
1da177e4 | 1030 | |
626e264d | 1031 | if (th->rst) |
1da177e4 LT |
1032 | return; |
1033 | ||
c3658e8d ED |
1034 | /* If sk not NULL, it means we did a successful lookup and incoming |
1035 | * route had to be correct. prequeue might have dropped our dst. | |
1036 | */ | |
1037 | if (!sk && !ipv6_unicast_destination(skb)) | |
626e264d | 1038 | return; |
1da177e4 | 1039 | |
39209673 | 1040 | net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
f7dca36f | 1041 | /* Invalid TCP option size or twice included auth */ |
ba7783ad | 1042 | if (tcp_parse_auth_options(th, &md5_hash_location, &aoh)) |
f7dca36f | 1043 | return; |
ba7783ad | 1044 | #if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) |
3b24d854 | 1045 | rcu_read_lock(); |
ba7783ad DS |
1046 | #endif |
1047 | #ifdef CONFIG_TCP_MD5SIG | |
271c3b9b | 1048 | if (sk && sk_fullsock(sk)) { |
dea53bb8 DA |
1049 | int l3index; |
1050 | ||
1051 | /* sdif set, means packet ingressed via a device | |
1052 | * in an L3 domain and inet_iif is set to it. | |
1053 | */ | |
1054 | l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0; | |
ba7783ad DS |
1055 | key.md5_key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr, l3index); |
1056 | if (key.md5_key) | |
1057 | key.type = TCP_KEY_MD5; | |
f7dca36f | 1058 | } else if (md5_hash_location) { |
d14c77e0 DA |
1059 | int dif = tcp_v6_iif_l3_slave(skb); |
1060 | int sdif = tcp_v6_sdif(skb); | |
dea53bb8 | 1061 | int l3index; |
d14c77e0 | 1062 | |
658ddaaf SL |
1063 | /* |
1064 | * active side is lost. Try to find listening socket through | |
1065 | * source port, and then find md5 key through listening socket. | |
1066 | * we are not loose security here: | |
1067 | * Incoming packet is checked with md5 hash with finding key, | |
1068 | * no RST generated if md5 hash doesn't match. | |
1069 | */ | |
4461568a KI |
1070 | sk1 = inet6_lookup_listener(net, net->ipv4.tcp_death_row.hashinfo, |
1071 | NULL, 0, &ipv6h->saddr, th->source, | |
1072 | &ipv6h->daddr, ntohs(th->source), | |
1073 | dif, sdif); | |
658ddaaf | 1074 | if (!sk1) |
3b24d854 | 1075 | goto out; |
658ddaaf | 1076 | |
dea53bb8 DA |
1077 | /* sdif set, means packet ingressed via a device |
1078 | * in an L3 domain and dif is set to it. | |
1079 | */ | |
1080 | l3index = tcp_v6_sdif(skb) ? dif : 0; | |
1081 | ||
ba7783ad DS |
1082 | key.md5_key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr, l3index); |
1083 | if (!key.md5_key) | |
3b24d854 | 1084 | goto out; |
ba7783ad | 1085 | key.type = TCP_KEY_MD5; |
658ddaaf | 1086 | |
ba7783ad | 1087 | genhash = tcp_v6_md5_hash_skb(newhash, key.md5_key, NULL, skb); |
f7dca36f | 1088 | if (genhash || memcmp(md5_hash_location, newhash, 16) != 0) |
3b24d854 | 1089 | goto out; |
658ddaaf | 1090 | } |
cfb6eeb4 YH |
1091 | #endif |
1092 | ||
626e264d IJ |
1093 | if (th->ack) |
1094 | seq = ntohl(th->ack_seq); | |
1095 | else | |
1096 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
1097 | (th->doff << 2); | |
1da177e4 | 1098 | |
ba7783ad DS |
1099 | #ifdef CONFIG_TCP_AO |
1100 | if (aoh) { | |
1101 | int l3index; | |
1102 | ||
1103 | l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0; | |
64382c71 | 1104 | if (tcp_ao_prepare_reset(sk, skb, aoh, l3index, seq, |
ba7783ad DS |
1105 | &key.ao_key, &key.traffic_key, |
1106 | &allocated_traffic_key, | |
1107 | &key.rcv_next, &key.sne)) | |
1108 | goto out; | |
1109 | key.type = TCP_KEY_AO; | |
1110 | } | |
1111 | #endif | |
1112 | ||
c24b14c4 SL |
1113 | if (sk) { |
1114 | oif = sk->sk_bound_dev_if; | |
052e0690 | 1115 | if (sk_fullsock(sk)) { |
5c487bb9 | 1116 | trace_tcp_send_reset(sk, skb); |
3cccda8d | 1117 | if (inet6_test_bit(REPFLOW, sk)) |
052e0690 | 1118 | label = ip6_flowlabel(ipv6h); |
10bbf165 | 1119 | priority = READ_ONCE(sk->sk_priority); |
dc6456e9 | 1120 | txhash = sk->sk_txhash; |
052e0690 | 1121 | } |
f6c0f5d2 | 1122 | if (sk->sk_state == TCP_TIME_WAIT) { |
50a8accf | 1123 | label = cpu_to_be32(inet_twsk(sk)->tw_flowlabel); |
f6c0f5d2 | 1124 | priority = inet_twsk(sk)->tw_priority; |
9258b8b1 | 1125 | txhash = inet_twsk(sk)->tw_txhash; |
f6c0f5d2 | 1126 | } |
323a53c4 | 1127 | } else { |
a346abe0 | 1128 | if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_TCP_RESET) |
323a53c4 | 1129 | label = ip6_flowlabel(ipv6h); |
c24b14c4 SL |
1130 | } |
1131 | ||
ba7783ad DS |
1132 | tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, 1, |
1133 | ipv6_get_dsfield(ipv6h), label, priority, txhash, | |
1134 | &key); | |
658ddaaf | 1135 | |
ba7783ad | 1136 | #if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) |
3b24d854 | 1137 | out: |
ba7783ad DS |
1138 | if (allocated_traffic_key) |
1139 | kfree(key.traffic_key); | |
3b24d854 | 1140 | rcu_read_unlock(); |
658ddaaf | 1141 | #endif |
626e264d | 1142 | } |
1da177e4 | 1143 | |
a00e7444 | 1144 | static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae | 1145 | u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, |
decde258 | 1146 | struct tcp_key *key, u8 tclass, |
aa51b80e | 1147 | __be32 label, u32 priority, u32 txhash) |
626e264d | 1148 | { |
ba7783ad | 1149 | tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, 0, |
decde258 | 1150 | tclass, label, priority, txhash, key); |
1da177e4 LT |
1151 | } |
1152 | ||
1153 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1154 | { | |
8feaf0c0 | 1155 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 1156 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
decde258 DS |
1157 | struct tcp_key key = {}; |
1158 | #ifdef CONFIG_TCP_AO | |
1159 | struct tcp_ao_info *ao_info; | |
1160 | ||
67fa83f7 DS |
1161 | if (static_branch_unlikely(&tcp_ao_needed.key)) { |
1162 | ||
1163 | /* FIXME: the segment to-be-acked is not verified yet */ | |
1164 | ao_info = rcu_dereference(tcptw->ao_info); | |
1165 | if (ao_info) { | |
1166 | const struct tcp_ao_hdr *aoh; | |
1167 | ||
1168 | /* Invalid TCP option size or twice included auth */ | |
1169 | if (tcp_parse_auth_options(tcp_hdr(skb), NULL, &aoh)) | |
1170 | goto out; | |
1171 | if (aoh) | |
1172 | key.ao_key = tcp_ao_established_key(ao_info, | |
1173 | aoh->rnext_keyid, -1); | |
decde258 DS |
1174 | } |
1175 | } | |
1176 | if (key.ao_key) { | |
1177 | struct tcp_ao_key *rnext_key; | |
1178 | ||
1179 | key.traffic_key = snd_other_key(key.ao_key); | |
1180 | /* rcv_next switches to our rcv_next */ | |
1181 | rnext_key = READ_ONCE(ao_info->rnext_key); | |
1182 | key.rcv_next = rnext_key->rcvid; | |
64382c71 | 1183 | key.sne = READ_ONCE(ao_info->snd_sne); |
decde258 DS |
1184 | key.type = TCP_KEY_AO; |
1185 | #else | |
1186 | if (0) { | |
1187 | #endif | |
1188 | #ifdef CONFIG_TCP_MD5SIG | |
1189 | } else if (static_branch_unlikely(&tcp_md5_needed.key)) { | |
1190 | key.md5_key = tcp_twsk_md5_key(tcptw); | |
1191 | if (key.md5_key) | |
1192 | key.type = TCP_KEY_MD5; | |
1193 | #endif | |
1194 | } | |
1da177e4 | 1195 | |
0f85feae | 1196 | tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 1197 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
16cf6477 | 1198 | tcp_tw_tsval(tcptw), |
decde258 | 1199 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, &key, |
aa51b80e ED |
1200 | tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel), tw->tw_priority, |
1201 | tw->tw_txhash); | |
1da177e4 | 1202 | |
decde258 DS |
1203 | #ifdef CONFIG_TCP_AO |
1204 | out: | |
1205 | #endif | |
8feaf0c0 | 1206 | inet_twsk_put(tw); |
1da177e4 LT |
1207 | } |
1208 | ||
a00e7444 | 1209 | static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, |
6edafaaf | 1210 | struct request_sock *req) |
1da177e4 | 1211 | { |
decde258 DS |
1212 | struct tcp_key key = {}; |
1213 | ||
06b22ef2 | 1214 | #ifdef CONFIG_TCP_AO |
67fa83f7 DS |
1215 | if (static_branch_unlikely(&tcp_ao_needed.key) && |
1216 | tcp_rsk_used_ao(req)) { | |
06b22ef2 DS |
1217 | const struct in6_addr *addr = &ipv6_hdr(skb)->saddr; |
1218 | const struct tcp_ao_hdr *aoh; | |
1219 | int l3index; | |
1220 | ||
1221 | l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0; | |
1222 | /* Invalid TCP option size or twice included auth */ | |
1223 | if (tcp_parse_auth_options(tcp_hdr(skb), NULL, &aoh)) | |
1224 | return; | |
1225 | if (!aoh) | |
1226 | return; | |
248411b8 DS |
1227 | key.ao_key = tcp_ao_do_lookup(sk, l3index, |
1228 | (union tcp_ao_addr *)addr, | |
1229 | AF_INET6, aoh->rnext_keyid, -1); | |
06b22ef2 DS |
1230 | if (unlikely(!key.ao_key)) { |
1231 | /* Send ACK with any matching MKT for the peer */ | |
248411b8 DS |
1232 | key.ao_key = tcp_ao_do_lookup(sk, l3index, |
1233 | (union tcp_ao_addr *)addr, | |
1234 | AF_INET6, -1, -1); | |
06b22ef2 DS |
1235 | /* Matching key disappeared (user removed the key?) |
1236 | * let the handshake timeout. | |
1237 | */ | |
1238 | if (!key.ao_key) { | |
1239 | net_info_ratelimited("TCP-AO key for (%pI6, %d)->(%pI6, %d) suddenly disappeared, won't ACK new connection\n", | |
1240 | addr, | |
1241 | ntohs(tcp_hdr(skb)->source), | |
1242 | &ipv6_hdr(skb)->daddr, | |
1243 | ntohs(tcp_hdr(skb)->dest)); | |
1244 | return; | |
1245 | } | |
1246 | } | |
1247 | key.traffic_key = kmalloc(tcp_ao_digest_size(key.ao_key), GFP_ATOMIC); | |
1248 | if (!key.traffic_key) | |
1249 | return; | |
1250 | ||
1251 | key.type = TCP_KEY_AO; | |
1252 | key.rcv_next = aoh->keyid; | |
1253 | tcp_v6_ao_calc_key_rsk(key.ao_key, key.traffic_key, req); | |
1254 | #else | |
1255 | if (0) { | |
1256 | #endif | |
decde258 | 1257 | #ifdef CONFIG_TCP_MD5SIG |
06b22ef2 | 1258 | } else if (static_branch_unlikely(&tcp_md5_needed.key)) { |
decde258 | 1259 | int l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0; |
dea53bb8 | 1260 | |
decde258 DS |
1261 | key.md5_key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr, |
1262 | l3index); | |
1263 | if (key.md5_key) | |
1264 | key.type = TCP_KEY_MD5; | |
decde258 | 1265 | #endif |
06b22ef2 | 1266 | } |
dea53bb8 | 1267 | |
3a19ce0e DL |
1268 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
1269 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
1270 | */ | |
20a2b49f ED |
1271 | /* RFC 7323 2.3 |
1272 | * The window field (SEG.WND) of every outgoing segment, with the | |
1273 | * exception of <SYN> segments, MUST be right-shifted by | |
1274 | * Rcv.Wind.Shift bits: | |
1275 | */ | |
0f85feae | 1276 | tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ? |
3a19ce0e | 1277 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
20a2b49f ED |
1278 | tcp_rsk(req)->rcv_nxt, |
1279 | req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale, | |
16cf6477 | 1280 | tcp_rsk_tsval(tcp_rsk(req)), |
eba20811 | 1281 | READ_ONCE(req->ts_recent), sk->sk_bound_dev_if, |
decde258 | 1282 | &key, ipv6_get_dsfield(ipv6_hdr(skb)), 0, |
8bf43be7 | 1283 | READ_ONCE(sk->sk_priority), |
5e526552 | 1284 | READ_ONCE(tcp_rsk(req)->txhash)); |
06b22ef2 DS |
1285 | if (tcp_key_is_ao(&key)) |
1286 | kfree(key.traffic_key); | |
1da177e4 LT |
1287 | } |
1288 | ||
1289 | ||
079096f1 | 1290 | static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1291 | { |
079096f1 | 1292 | #ifdef CONFIG_SYN_COOKIES |
aa8223c7 | 1293 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 1294 | |
af9b4738 | 1295 | if (!th->syn) |
c6aefafb | 1296 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1297 | #endif |
1298 | return sk; | |
1299 | } | |
1300 | ||
9349d600 PP |
1301 | u16 tcp_v6_get_syncookie(struct sock *sk, struct ipv6hdr *iph, |
1302 | struct tcphdr *th, u32 *cookie) | |
1303 | { | |
1304 | u16 mss = 0; | |
1305 | #ifdef CONFIG_SYN_COOKIES | |
1306 | mss = tcp_get_syncookie_mss(&tcp6_request_sock_ops, | |
1307 | &tcp_request_sock_ipv6_ops, sk, th); | |
1308 | if (mss) { | |
1309 | *cookie = __cookie_v6_init_sequence(iph, th, &mss); | |
1310 | tcp_synq_overflow(sk); | |
1311 | } | |
1312 | #endif | |
1313 | return mss; | |
1314 | } | |
1315 | ||
1da177e4 LT |
1316 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
1317 | { | |
1da177e4 LT |
1318 | if (skb->protocol == htons(ETH_P_IP)) |
1319 | return tcp_v4_conn_request(sk, skb); | |
1320 | ||
1321 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1322 | goto drop; |
1da177e4 | 1323 | |
dcc32f4f JK |
1324 | if (ipv6_addr_v4mapped(&ipv6_hdr(skb)->saddr)) { |
1325 | __IP6_INC_STATS(sock_net(sk), NULL, IPSTATS_MIB_INHDRERRORS); | |
1326 | return 0; | |
1327 | } | |
1328 | ||
1fb6f159 OP |
1329 | return tcp_conn_request(&tcp6_request_sock_ops, |
1330 | &tcp_request_sock_ipv6_ops, sk, skb); | |
1da177e4 LT |
1331 | |
1332 | drop: | |
9caad864 | 1333 | tcp_listendrop(sk); |
1da177e4 LT |
1334 | return 0; /* don't send reset */ |
1335 | } | |
1336 | ||
ebf6c9cb ED |
1337 | static void tcp_v6_restore_cb(struct sk_buff *skb) |
1338 | { | |
1339 | /* We need to move header back to the beginning if xfrm6_policy_check() | |
1340 | * and tcp_v6_fill_cb() are going to be called again. | |
1341 | * ip6_datagram_recv_specific_ctl() also expects IP6CB to be there. | |
1342 | */ | |
1343 | memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6, | |
1344 | sizeof(struct inet6_skb_parm)); | |
1345 | } | |
1346 | ||
0c27171e | 1347 | static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, |
4c99aa40 | 1348 | struct request_sock *req, |
5e0724d0 ED |
1349 | struct dst_entry *dst, |
1350 | struct request_sock *req_unhash, | |
1351 | bool *own_req) | |
1da177e4 | 1352 | { |
634fb979 | 1353 | struct inet_request_sock *ireq; |
0c27171e | 1354 | struct ipv6_pinfo *newnp; |
93a77c11 | 1355 | const struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
45f6fad8 | 1356 | struct ipv6_txoptions *opt; |
1da177e4 | 1357 | struct inet_sock *newinet; |
01770a16 | 1358 | bool found_dup_sk = false; |
1da177e4 LT |
1359 | struct tcp_sock *newtp; |
1360 | struct sock *newsk; | |
cfb6eeb4 YH |
1361 | #ifdef CONFIG_TCP_MD5SIG |
1362 | struct tcp_md5sig_key *key; | |
dea53bb8 | 1363 | int l3index; |
cfb6eeb4 | 1364 | #endif |
3840a06e | 1365 | struct flowi6 fl6; |
1da177e4 LT |
1366 | |
1367 | if (skb->protocol == htons(ETH_P_IP)) { | |
1368 | /* | |
1369 | * v6 mapped | |
1370 | */ | |
1371 | ||
5e0724d0 ED |
1372 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst, |
1373 | req_unhash, own_req); | |
1da177e4 | 1374 | |
63159f29 | 1375 | if (!newsk) |
1da177e4 LT |
1376 | return NULL; |
1377 | ||
93a77c11 | 1378 | inet_sk(newsk)->pinet6 = tcp_inet6_sk(newsk); |
1da177e4 | 1379 | |
93a77c11 | 1380 | newnp = tcp_inet6_sk(newsk); |
1da177e4 LT |
1381 | newtp = tcp_sk(newsk); |
1382 | ||
1383 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1384 | ||
d1e559d0 | 1385 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
1da177e4 | 1386 | |
8292a17a | 1387 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
cec37a6e | 1388 | if (sk_is_mptcp(newsk)) |
31484d56 | 1389 | mptcpv6_handle_mapped(newsk, true); |
1da177e4 | 1390 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
4954f17d | 1391 | #if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) |
cfb6eeb4 YH |
1392 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; |
1393 | #endif | |
1394 | ||
83eaddab | 1395 | newnp->ipv6_mc_list = NULL; |
676a1184 YZ |
1396 | newnp->ipv6_ac_list = NULL; |
1397 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1398 | newnp->pktoptions = NULL; |
1399 | newnp->opt = NULL; | |
89e41309 ED |
1400 | newnp->mcast_oif = inet_iif(skb); |
1401 | newnp->mcast_hops = ip_hdr(skb)->ttl; | |
1402 | newnp->rcv_flowinfo = 0; | |
3cccda8d | 1403 | if (inet6_test_bit(REPFLOW, sk)) |
89e41309 | 1404 | newnp->flow_label = 0; |
1da177e4 | 1405 | |
e6848976 ACM |
1406 | /* |
1407 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1408 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1409 | * that function for the gory details. -acme | |
1da177e4 | 1410 | */ |
1da177e4 LT |
1411 | |
1412 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1413 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1414 | Sync it now. |
1415 | */ | |
d83d8461 | 1416 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1417 | |
1418 | return newsk; | |
1419 | } | |
1420 | ||
634fb979 | 1421 | ireq = inet_rsk(req); |
1da177e4 LT |
1422 | |
1423 | if (sk_acceptq_is_full(sk)) | |
1424 | goto out_overflow; | |
1425 | ||
493f377d | 1426 | if (!dst) { |
f76b33c3 | 1427 | dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_TCP); |
493f377d | 1428 | if (!dst) |
1da177e4 | 1429 | goto out; |
1ab1457c | 1430 | } |
1da177e4 LT |
1431 | |
1432 | newsk = tcp_create_openreq_child(sk, req, skb); | |
63159f29 | 1433 | if (!newsk) |
093d2823 | 1434 | goto out_nonewsk; |
1da177e4 | 1435 | |
e6848976 ACM |
1436 | /* |
1437 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1438 | * count here, tcp_create_openreq_child now does this for us, see the | |
1439 | * comment in that function for the gory details. -acme | |
1440 | */ | |
1da177e4 | 1441 | |
59eed279 | 1442 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
6bd4f355 | 1443 | ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1444 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 | 1445 | |
93a77c11 | 1446 | inet_sk(newsk)->pinet6 = tcp_inet6_sk(newsk); |
1da177e4 LT |
1447 | |
1448 | newtp = tcp_sk(newsk); | |
1449 | newinet = inet_sk(newsk); | |
93a77c11 | 1450 | newnp = tcp_inet6_sk(newsk); |
1da177e4 LT |
1451 | |
1452 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1453 | ||
634fb979 ED |
1454 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1455 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1456 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1457 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1458 | |
1ab1457c | 1459 | /* Now IPv6 options... |
1da177e4 LT |
1460 | |
1461 | First: no IPv4 options. | |
1462 | */ | |
f6d8bd05 | 1463 | newinet->inet_opt = NULL; |
83eaddab | 1464 | newnp->ipv6_mc_list = NULL; |
676a1184 | 1465 | newnp->ipv6_ac_list = NULL; |
d35690be | 1466 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1467 | |
1468 | /* Clone RX bits */ | |
1469 | newnp->rxopt.all = np->rxopt.all; | |
1470 | ||
1da177e4 | 1471 | newnp->pktoptions = NULL; |
1da177e4 | 1472 | newnp->opt = NULL; |
870c3151 | 1473 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1474 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1475 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
3cccda8d | 1476 | if (inet6_test_bit(REPFLOW, sk)) |
df3687ff | 1477 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); |
1da177e4 | 1478 | |
8ef44b6f WW |
1479 | /* Set ToS of the new socket based upon the value of incoming SYN. |
1480 | * ECT bits are set later in tcp_init_transfer(). | |
1481 | */ | |
870e3a63 | 1482 | if (READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_reflect_tos)) |
ac8f1710 WW |
1483 | newnp->tclass = tcp_rsk(req)->syn_tos & ~INET_ECN_MASK; |
1484 | ||
1da177e4 LT |
1485 | /* Clone native IPv6 options from listening socket (if any) |
1486 | ||
1487 | Yes, keeping reference count would be much more clever, | |
1488 | but we make one more one thing there: reattach optmem | |
1489 | to newsk. | |
1490 | */ | |
56ac42bc HD |
1491 | opt = ireq->ipv6_opt; |
1492 | if (!opt) | |
1493 | opt = rcu_dereference(np->opt); | |
45f6fad8 ED |
1494 | if (opt) { |
1495 | opt = ipv6_dup_options(newsk, opt); | |
1496 | RCU_INIT_POINTER(newnp->opt, opt); | |
1497 | } | |
d83d8461 | 1498 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
1499 | if (opt) |
1500 | inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen + | |
1501 | opt->opt_flen; | |
1da177e4 | 1502 | |
81164413 DB |
1503 | tcp_ca_openreq_child(newsk, dst); |
1504 | ||
1da177e4 | 1505 | tcp_sync_mss(newsk, dst_mtu(dst)); |
3541f9e8 | 1506 | newtp->advmss = tcp_mss_clamp(tcp_sk(sk), dst_metric_advmss(dst)); |
d135c522 | 1507 | |
1da177e4 LT |
1508 | tcp_initialize_rcv_mss(newsk); |
1509 | ||
c720c7e8 ED |
1510 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1511 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1512 | |
cfb6eeb4 | 1513 | #ifdef CONFIG_TCP_MD5SIG |
dea53bb8 DA |
1514 | l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif); |
1515 | ||
06b22ef2 DS |
1516 | if (!tcp_rsk_used_ao(req)) { |
1517 | /* Copy over the MD5 key from the original socket */ | |
1518 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr, l3index); | |
1519 | if (key) { | |
1520 | const union tcp_md5_addr *addr; | |
1521 | ||
1522 | addr = (union tcp_md5_addr *)&newsk->sk_v6_daddr; | |
1523 | if (tcp_md5_key_copy(newsk, addr, AF_INET6, 128, l3index, key)) { | |
1524 | inet_csk_prepare_forced_close(newsk); | |
1525 | tcp_done(newsk); | |
1526 | goto out; | |
1527 | } | |
b389d1af | 1528 | } |
cfb6eeb4 YH |
1529 | } |
1530 | #endif | |
06b22ef2 DS |
1531 | #ifdef CONFIG_TCP_AO |
1532 | /* Copy over tcp_ao_info if any */ | |
1533 | if (tcp_ao_copy_all_matching(sk, newsk, req, skb, AF_INET6)) | |
1534 | goto out; /* OOM */ | |
1535 | #endif | |
cfb6eeb4 | 1536 | |
093d2823 | 1537 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1538 | inet_csk_prepare_forced_close(newsk); |
1539 | tcp_done(newsk); | |
093d2823 BS |
1540 | goto out; |
1541 | } | |
01770a16 RD |
1542 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash), |
1543 | &found_dup_sk); | |
805c4bc0 | 1544 | if (*own_req) { |
49a496c9 | 1545 | tcp_move_syn(newtp, req); |
805c4bc0 ED |
1546 | |
1547 | /* Clone pktoptions received with SYN, if we own the req */ | |
1548 | if (ireq->pktopts) { | |
ca43ccf4 | 1549 | newnp->pktoptions = skb_clone_and_charge_r(ireq->pktopts, newsk); |
805c4bc0 ED |
1550 | consume_skb(ireq->pktopts); |
1551 | ireq->pktopts = NULL; | |
ca43ccf4 | 1552 | if (newnp->pktoptions) |
ebf6c9cb | 1553 | tcp_v6_restore_cb(newnp->pktoptions); |
805c4bc0 | 1554 | } |
01770a16 RD |
1555 | } else { |
1556 | if (!req_unhash && found_dup_sk) { | |
1557 | /* This code path should only be executed in the | |
1558 | * syncookie case only | |
1559 | */ | |
1560 | bh_unlock_sock(newsk); | |
1561 | sock_put(newsk); | |
1562 | newsk = NULL; | |
1563 | } | |
ce105008 | 1564 | } |
1da177e4 LT |
1565 | |
1566 | return newsk; | |
1567 | ||
1568 | out_overflow: | |
02a1d6e7 | 1569 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1570 | out_nonewsk: |
1da177e4 | 1571 | dst_release(dst); |
093d2823 | 1572 | out: |
9caad864 | 1573 | tcp_listendrop(sk); |
1da177e4 LT |
1574 | return NULL; |
1575 | } | |
1576 | ||
bbd807df BV |
1577 | INDIRECT_CALLABLE_DECLARE(struct dst_entry *ipv4_dst_check(struct dst_entry *, |
1578 | u32)); | |
1da177e4 | 1579 | /* The socket must have it's spinlock held when we get |
e994b2f0 | 1580 | * here, unless it is a TCP_LISTEN socket. |
1da177e4 LT |
1581 | * |
1582 | * We have a potential double-lock case here, so even when | |
1583 | * doing backlog processing we use the BH locking scheme. | |
1584 | * This is because we cannot sleep with the original spinlock | |
1585 | * held. | |
1586 | */ | |
d2489c7b ED |
1587 | INDIRECT_CALLABLE_SCOPE |
1588 | int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1da177e4 | 1589 | { |
93a77c11 | 1590 | struct ipv6_pinfo *np = tcp_inet6_sk(sk); |
1da177e4 | 1591 | struct sk_buff *opt_skb = NULL; |
8eba65fa | 1592 | enum skb_drop_reason reason; |
93a77c11 | 1593 | struct tcp_sock *tp; |
1da177e4 LT |
1594 | |
1595 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1596 | goes to IPv4 receive handler and backlogged. | |
1597 | From backlog it always goes here. Kerboom... | |
1598 | Fortunately, tcp_rcv_established and rcv_established | |
1599 | handle them correctly, but it is not case with | |
1600 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1601 | */ | |
1602 | ||
1603 | if (skb->protocol == htons(ETH_P_IP)) | |
1604 | return tcp_v4_do_rcv(sk, skb); | |
1605 | ||
1da177e4 LT |
1606 | /* |
1607 | * socket locking is here for SMP purposes as backlog rcv | |
1608 | * is currently called with bh processing disabled. | |
1609 | */ | |
1610 | ||
1611 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1612 | ||
1613 | Yes, guys, it is the only place in our code, where we | |
1614 | may make it not affecting IPv4. | |
1615 | The rest of code is protocol independent, | |
1616 | and I do not like idea to uglify IPv4. | |
1617 | ||
1618 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1619 | looks not very well thought. For now we latch | |
1620 | options, received in the last packet, enqueued | |
1621 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1622 | --ANK (980728) |
1da177e4 LT |
1623 | */ |
1624 | if (np->rxopt.all) | |
ca43ccf4 | 1625 | opt_skb = skb_clone_and_charge_r(skb, sk); |
1da177e4 LT |
1626 | |
1627 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
8f905c0e ED |
1628 | struct dst_entry *dst; |
1629 | ||
1630 | dst = rcu_dereference_protected(sk->sk_rx_dst, | |
1631 | lockdep_sock_is_held(sk)); | |
5d299f3d | 1632 | |
bdeab991 | 1633 | sock_rps_save_rxhash(sk, skb); |
3d97379a | 1634 | sk_mark_napi_id(sk, skb); |
5d299f3d | 1635 | if (dst) { |
0c0a5ef8 | 1636 | if (sk->sk_rx_dst_ifindex != skb->skb_iif || |
bbd807df | 1637 | INDIRECT_CALL_1(dst->ops->check, ip6_dst_check, |
ef57c161 | 1638 | dst, sk->sk_rx_dst_cookie) == NULL) { |
8f905c0e | 1639 | RCU_INIT_POINTER(sk->sk_rx_dst, NULL); |
5d299f3d | 1640 | dst_release(dst); |
5d299f3d ED |
1641 | } |
1642 | } | |
1643 | ||
3d97d88e | 1644 | tcp_rcv_established(sk, skb); |
1da177e4 LT |
1645 | if (opt_skb) |
1646 | goto ipv6_pktoptions; | |
1647 | return 0; | |
1648 | } | |
1649 | ||
12e25e10 | 1650 | if (tcp_checksum_complete(skb)) |
1da177e4 LT |
1651 | goto csum_err; |
1652 | ||
1ab1457c | 1653 | if (sk->sk_state == TCP_LISTEN) { |
079096f1 ED |
1654 | struct sock *nsk = tcp_v6_cookie_check(sk, skb); |
1655 | ||
4c99aa40 | 1656 | if (nsk != sk) { |
ee01defe JX |
1657 | if (nsk) { |
1658 | reason = tcp_child_process(sk, nsk, skb); | |
1659 | if (reason) | |
1660 | goto reset; | |
1661 | } | |
1da177e4 LT |
1662 | if (opt_skb) |
1663 | __kfree_skb(opt_skb); | |
1664 | return 0; | |
1665 | } | |
47482f13 | 1666 | } else |
bdeab991 | 1667 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1668 | |
b9825695 JX |
1669 | reason = tcp_rcv_state_process(sk, skb); |
1670 | if (reason) | |
1da177e4 | 1671 | goto reset; |
1da177e4 LT |
1672 | if (opt_skb) |
1673 | goto ipv6_pktoptions; | |
1674 | return 0; | |
1675 | ||
1676 | reset: | |
cfb6eeb4 | 1677 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1678 | discard: |
1679 | if (opt_skb) | |
1680 | __kfree_skb(opt_skb); | |
8eba65fa | 1681 | kfree_skb_reason(skb, reason); |
1da177e4 LT |
1682 | return 0; |
1683 | csum_err: | |
8eba65fa | 1684 | reason = SKB_DROP_REASON_TCP_CSUM; |
709c0314 | 1685 | trace_tcp_bad_csum(skb); |
c10d9310 ED |
1686 | TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS); |
1687 | TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS); | |
1da177e4 LT |
1688 | goto discard; |
1689 | ||
1690 | ||
1691 | ipv6_pktoptions: | |
1692 | /* Do you ask, what is it? | |
1693 | ||
1694 | 1. skb was enqueued by tcp. | |
1695 | 2. skb is added to tail of read queue, rather than out of order. | |
1696 | 3. socket is not in passive state. | |
1697 | 4. Finally, it really contains options, which user wants to receive. | |
1698 | */ | |
1699 | tp = tcp_sk(sk); | |
1700 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1701 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1702 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
d2f011a0 | 1703 | WRITE_ONCE(np->mcast_oif, tcp_v6_iif(opt_skb)); |
333fad53 | 1704 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
2da23eb0 ED |
1705 | WRITE_ONCE(np->mcast_hops, |
1706 | ipv6_hdr(opt_skb)->hop_limit); | |
82e9f105 | 1707 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1708 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
3cccda8d | 1709 | if (inet6_test_bit(REPFLOW, sk)) |
df3687ff | 1710 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); |
a224772d | 1711 | if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) { |
8ce48623 | 1712 | tcp_v6_restore_cb(opt_skb); |
1da177e4 LT |
1713 | opt_skb = xchg(&np->pktoptions, opt_skb); |
1714 | } else { | |
1715 | __kfree_skb(opt_skb); | |
1716 | opt_skb = xchg(&np->pktoptions, NULL); | |
1717 | } | |
1718 | } | |
1719 | ||
12c8691d | 1720 | consume_skb(opt_skb); |
1da177e4 LT |
1721 | return 0; |
1722 | } | |
1723 | ||
2dc49d16 ND |
1724 | static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr, |
1725 | const struct tcphdr *th) | |
1726 | { | |
1727 | /* This is tricky: we move IP6CB at its correct location into | |
1728 | * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because | |
1729 | * _decode_session6() uses IP6CB(). | |
1730 | * barrier() makes sure compiler won't play aliasing games. | |
1731 | */ | |
1732 | memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb), | |
1733 | sizeof(struct inet6_skb_parm)); | |
1734 | barrier(); | |
1735 | ||
1736 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1737 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1738 | skb->len - th->doff*4); | |
1739 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1740 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); | |
1741 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; | |
1742 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); | |
1743 | TCP_SKB_CB(skb)->sacked = 0; | |
98aaa913 MM |
1744 | TCP_SKB_CB(skb)->has_rxtstamp = |
1745 | skb->tstamp || skb_hwtstamps(skb)->hwtstamp; | |
2dc49d16 ND |
1746 | } |
1747 | ||
0e219ae4 | 1748 | INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1749 | { |
c0e3154d | 1750 | enum skb_drop_reason drop_reason; |
4297a0ef | 1751 | int sdif = inet6_sdif(skb); |
d14c77e0 | 1752 | int dif = inet6_iif(skb); |
cf533ea5 | 1753 | const struct tcphdr *th; |
b71d1d42 | 1754 | const struct ipv6hdr *hdr; |
3b24d854 | 1755 | bool refcounted; |
1da177e4 LT |
1756 | struct sock *sk; |
1757 | int ret; | |
a86b1e30 | 1758 | struct net *net = dev_net(skb->dev); |
1da177e4 | 1759 | |
c0e3154d | 1760 | drop_reason = SKB_DROP_REASON_NOT_SPECIFIED; |
1da177e4 LT |
1761 | if (skb->pkt_type != PACKET_HOST) |
1762 | goto discard_it; | |
1763 | ||
1764 | /* | |
1765 | * Count it even if it's bad. | |
1766 | */ | |
90bbcc60 | 1767 | __TCP_INC_STATS(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1768 | |
1769 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1770 | goto discard_it; | |
1771 | ||
ea1627c2 | 1772 | th = (const struct tcphdr *)skb->data; |
1da177e4 | 1773 | |
c0e3154d MD |
1774 | if (unlikely(th->doff < sizeof(struct tcphdr) / 4)) { |
1775 | drop_reason = SKB_DROP_REASON_PKT_TOO_SMALL; | |
1da177e4 | 1776 | goto bad_packet; |
c0e3154d | 1777 | } |
1da177e4 LT |
1778 | if (!pskb_may_pull(skb, th->doff*4)) |
1779 | goto discard_it; | |
1780 | ||
e4f45b7f | 1781 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
6a5dc9e5 | 1782 | goto csum_error; |
1da177e4 | 1783 | |
ea1627c2 | 1784 | th = (const struct tcphdr *)skb->data; |
e802af9c | 1785 | hdr = ipv6_hdr(skb); |
1da177e4 | 1786 | |
4bdc3d66 | 1787 | lookup: |
4461568a | 1788 | sk = __inet6_lookup_skb(net->ipv4.tcp_death_row.hashinfo, skb, __tcp_hdrlen(th), |
4297a0ef | 1789 | th->source, th->dest, inet6_iif(skb), sdif, |
3b24d854 | 1790 | &refcounted); |
1da177e4 LT |
1791 | if (!sk) |
1792 | goto no_tcp_socket; | |
1793 | ||
1794 | process: | |
1795 | if (sk->sk_state == TCP_TIME_WAIT) | |
1796 | goto do_time_wait; | |
1797 | ||
079096f1 ED |
1798 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
1799 | struct request_sock *req = inet_reqsk(sk); | |
e0f9759f | 1800 | bool req_stolen = false; |
7716682c | 1801 | struct sock *nsk; |
079096f1 ED |
1802 | |
1803 | sk = req->rsk_listener; | |
9593c7cb IM |
1804 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1805 | drop_reason = SKB_DROP_REASON_XFRM_POLICY; | |
1806 | else | |
0a3a8090 DS |
1807 | drop_reason = tcp_inbound_hash(sk, req, skb, |
1808 | &hdr->saddr, &hdr->daddr, | |
1809 | AF_INET6, dif, sdif); | |
1330b6ef | 1810 | if (drop_reason) { |
e65c332d | 1811 | sk_drops_add(sk, skb); |
079096f1 ED |
1812 | reqsk_put(req); |
1813 | goto discard_it; | |
1814 | } | |
4fd44a98 FL |
1815 | if (tcp_checksum_complete(skb)) { |
1816 | reqsk_put(req); | |
1817 | goto csum_error; | |
1818 | } | |
7716682c | 1819 | if (unlikely(sk->sk_state != TCP_LISTEN)) { |
d4f2c86b KI |
1820 | nsk = reuseport_migrate_sock(sk, req_to_sk(req), skb); |
1821 | if (!nsk) { | |
1822 | inet_csk_reqsk_queue_drop_and_put(sk, req); | |
1823 | goto lookup; | |
1824 | } | |
1825 | sk = nsk; | |
1826 | /* reuseport_migrate_sock() has already held one sk_refcnt | |
1827 | * before returning. | |
1828 | */ | |
1829 | } else { | |
1830 | sock_hold(sk); | |
4bdc3d66 | 1831 | } |
3b24d854 | 1832 | refcounted = true; |
1f3b359f | 1833 | nsk = NULL; |
eeea10b8 ED |
1834 | if (!tcp_filter(sk, skb)) { |
1835 | th = (const struct tcphdr *)skb->data; | |
1836 | hdr = ipv6_hdr(skb); | |
1837 | tcp_v6_fill_cb(skb, hdr, th); | |
e0f9759f | 1838 | nsk = tcp_check_req(sk, skb, req, false, &req_stolen); |
c0e3154d MD |
1839 | } else { |
1840 | drop_reason = SKB_DROP_REASON_SOCKET_FILTER; | |
eeea10b8 | 1841 | } |
079096f1 ED |
1842 | if (!nsk) { |
1843 | reqsk_put(req); | |
e0f9759f ED |
1844 | if (req_stolen) { |
1845 | /* Another cpu got exclusive access to req | |
1846 | * and created a full blown socket. | |
1847 | * Try to feed this packet to this socket | |
1848 | * instead of discarding it. | |
1849 | */ | |
1850 | tcp_v6_restore_cb(skb); | |
1851 | sock_put(sk); | |
1852 | goto lookup; | |
1853 | } | |
7716682c | 1854 | goto discard_and_relse; |
079096f1 | 1855 | } |
9593c7cb | 1856 | nf_reset_ct(skb); |
079096f1 | 1857 | if (nsk == sk) { |
079096f1 ED |
1858 | reqsk_put(req); |
1859 | tcp_v6_restore_cb(skb); | |
079096f1 | 1860 | } else { |
ee01defe JX |
1861 | drop_reason = tcp_child_process(sk, nsk, skb); |
1862 | if (drop_reason) { | |
1863 | tcp_v6_send_reset(nsk, skb); | |
1864 | goto discard_and_relse; | |
1865 | } | |
7716682c | 1866 | sock_put(sk); |
079096f1 ED |
1867 | return 0; |
1868 | } | |
1869 | } | |
790eb673 ED |
1870 | |
1871 | if (static_branch_unlikely(&ip6_min_hopcount)) { | |
1872 | /* min_hopcount can be changed concurrently from do_ipv6_setsockopt() */ | |
2798e36d | 1873 | if (unlikely(hdr->hop_limit < READ_ONCE(tcp_inet6_sk(sk)->min_hopcount))) { |
790eb673 | 1874 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
2798e36d | 1875 | drop_reason = SKB_DROP_REASON_TCP_MINTTL; |
790eb673 ED |
1876 | goto discard_and_relse; |
1877 | } | |
e802af9c SH |
1878 | } |
1879 | ||
c0e3154d MD |
1880 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { |
1881 | drop_reason = SKB_DROP_REASON_XFRM_POLICY; | |
1da177e4 | 1882 | goto discard_and_relse; |
c0e3154d | 1883 | } |
1da177e4 | 1884 | |
0a3a8090 DS |
1885 | drop_reason = tcp_inbound_hash(sk, NULL, skb, &hdr->saddr, &hdr->daddr, |
1886 | AF_INET6, dif, sdif); | |
1330b6ef | 1887 | if (drop_reason) |
9ea88a15 | 1888 | goto discard_and_relse; |
9ea88a15 | 1889 | |
b0e214d2 MK |
1890 | nf_reset_ct(skb); |
1891 | ||
c0e3154d MD |
1892 | if (tcp_filter(sk, skb)) { |
1893 | drop_reason = SKB_DROP_REASON_SOCKET_FILTER; | |
1da177e4 | 1894 | goto discard_and_relse; |
c0e3154d | 1895 | } |
ac6e7800 ED |
1896 | th = (const struct tcphdr *)skb->data; |
1897 | hdr = ipv6_hdr(skb); | |
eeea10b8 | 1898 | tcp_v6_fill_cb(skb, hdr, th); |
1da177e4 LT |
1899 | |
1900 | skb->dev = NULL; | |
1901 | ||
e994b2f0 ED |
1902 | if (sk->sk_state == TCP_LISTEN) { |
1903 | ret = tcp_v6_do_rcv(sk, skb); | |
1904 | goto put_and_return; | |
1905 | } | |
1906 | ||
1907 | sk_incoming_cpu_update(sk); | |
1908 | ||
293b9c42 | 1909 | bh_lock_sock_nested(sk); |
a44d6eac | 1910 | tcp_segs_in(tcp_sk(sk), skb); |
1da177e4 LT |
1911 | ret = 0; |
1912 | if (!sock_owned_by_user(sk)) { | |
e7942d06 | 1913 | ret = tcp_v6_do_rcv(sk, skb); |
8b27dae5 | 1914 | } else { |
7a26dc9e | 1915 | if (tcp_add_backlog(sk, skb, &drop_reason)) |
8b27dae5 | 1916 | goto discard_and_relse; |
6b03a53a | 1917 | } |
1da177e4 | 1918 | bh_unlock_sock(sk); |
e994b2f0 | 1919 | put_and_return: |
3b24d854 ED |
1920 | if (refcounted) |
1921 | sock_put(sk); | |
1da177e4 LT |
1922 | return ret ? -1 : 0; |
1923 | ||
1924 | no_tcp_socket: | |
c0e3154d | 1925 | drop_reason = SKB_DROP_REASON_NO_SOCKET; |
1da177e4 LT |
1926 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
1927 | goto discard_it; | |
1928 | ||
2dc49d16 ND |
1929 | tcp_v6_fill_cb(skb, hdr, th); |
1930 | ||
12e25e10 | 1931 | if (tcp_checksum_complete(skb)) { |
6a5dc9e5 | 1932 | csum_error: |
c0e3154d | 1933 | drop_reason = SKB_DROP_REASON_TCP_CSUM; |
709c0314 | 1934 | trace_tcp_bad_csum(skb); |
90bbcc60 | 1935 | __TCP_INC_STATS(net, TCP_MIB_CSUMERRORS); |
1da177e4 | 1936 | bad_packet: |
90bbcc60 | 1937 | __TCP_INC_STATS(net, TCP_MIB_INERRS); |
1da177e4 | 1938 | } else { |
cfb6eeb4 | 1939 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1940 | } |
1941 | ||
1942 | discard_it: | |
dc776924 | 1943 | SKB_DR_OR(drop_reason, NOT_SPECIFIED); |
c0e3154d | 1944 | kfree_skb_reason(skb, drop_reason); |
1da177e4 LT |
1945 | return 0; |
1946 | ||
1947 | discard_and_relse: | |
532182cd | 1948 | sk_drops_add(sk, skb); |
3b24d854 ED |
1949 | if (refcounted) |
1950 | sock_put(sk); | |
1da177e4 LT |
1951 | goto discard_it; |
1952 | ||
1953 | do_time_wait: | |
1954 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
c0e3154d | 1955 | drop_reason = SKB_DROP_REASON_XFRM_POLICY; |
9469c7b4 | 1956 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1957 | goto discard_it; |
1958 | } | |
1959 | ||
2dc49d16 ND |
1960 | tcp_v6_fill_cb(skb, hdr, th); |
1961 | ||
6a5dc9e5 ED |
1962 | if (tcp_checksum_complete(skb)) { |
1963 | inet_twsk_put(inet_twsk(sk)); | |
1964 | goto csum_error; | |
1da177e4 LT |
1965 | } |
1966 | ||
9469c7b4 | 1967 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1968 | case TCP_TW_SYN: |
1969 | { | |
1970 | struct sock *sk2; | |
1971 | ||
4461568a | 1972 | sk2 = inet6_lookup_listener(net, net->ipv4.tcp_death_row.hashinfo, |
a583636a | 1973 | skb, __tcp_hdrlen(th), |
5ba24953 | 1974 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1975 | &ipv6_hdr(skb)->daddr, |
24b711ed DA |
1976 | ntohs(th->dest), |
1977 | tcp_v6_iif_l3_slave(skb), | |
4297a0ef | 1978 | sdif); |
53b24b8f | 1979 | if (sk2) { |
295ff7ed | 1980 | struct inet_timewait_sock *tw = inet_twsk(sk); |
dbe7faa4 | 1981 | inet_twsk_deschedule_put(tw); |
1da177e4 | 1982 | sk = sk2; |
4ad19de8 | 1983 | tcp_v6_restore_cb(skb); |
3b24d854 | 1984 | refcounted = false; |
1da177e4 LT |
1985 | goto process; |
1986 | } | |
1da177e4 | 1987 | } |
275757e6 | 1988 | /* to ACK */ |
a8eceea8 | 1989 | fallthrough; |
1da177e4 LT |
1990 | case TCP_TW_ACK: |
1991 | tcp_v6_timewait_ack(sk, skb); | |
1992 | break; | |
1993 | case TCP_TW_RST: | |
271c3b9b FW |
1994 | tcp_v6_send_reset(sk, skb); |
1995 | inet_twsk_deschedule_put(inet_twsk(sk)); | |
1996 | goto discard_it; | |
4aa956d8 WY |
1997 | case TCP_TW_SUCCESS: |
1998 | ; | |
1da177e4 LT |
1999 | } |
2000 | goto discard_it; | |
2001 | } | |
2002 | ||
11052589 | 2003 | void tcp_v6_early_demux(struct sk_buff *skb) |
c7109986 | 2004 | { |
4461568a | 2005 | struct net *net = dev_net(skb->dev); |
c7109986 ED |
2006 | const struct ipv6hdr *hdr; |
2007 | const struct tcphdr *th; | |
2008 | struct sock *sk; | |
2009 | ||
2010 | if (skb->pkt_type != PACKET_HOST) | |
2011 | return; | |
2012 | ||
2013 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
2014 | return; | |
2015 | ||
2016 | hdr = ipv6_hdr(skb); | |
2017 | th = tcp_hdr(skb); | |
2018 | ||
2019 | if (th->doff < sizeof(struct tcphdr) / 4) | |
2020 | return; | |
2021 | ||
870c3151 | 2022 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
4461568a | 2023 | sk = __inet6_lookup_established(net, net->ipv4.tcp_death_row.hashinfo, |
c7109986 ED |
2024 | &hdr->saddr, th->source, |
2025 | &hdr->daddr, ntohs(th->dest), | |
4297a0ef | 2026 | inet6_iif(skb), inet6_sdif(skb)); |
c7109986 ED |
2027 | if (sk) { |
2028 | skb->sk = sk; | |
2029 | skb->destructor = sock_edemux; | |
f7e4eb03 | 2030 | if (sk_fullsock(sk)) { |
8f905c0e | 2031 | struct dst_entry *dst = rcu_dereference(sk->sk_rx_dst); |
f3f12135 | 2032 | |
c7109986 | 2033 | if (dst) |
ef57c161 | 2034 | dst = dst_check(dst, sk->sk_rx_dst_cookie); |
c7109986 | 2035 | if (dst && |
0c0a5ef8 | 2036 | sk->sk_rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
2037 | skb_dst_set_noref(skb, dst); |
2038 | } | |
2039 | } | |
2040 | } | |
2041 | ||
ccb7c410 DM |
2042 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
2043 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
2044 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 2045 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
2046 | }; |
2047 | ||
dd2e0b86 ED |
2048 | INDIRECT_CALLABLE_SCOPE void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
2049 | { | |
37354402 | 2050 | __tcp_v6_send_check(skb, &sk->sk_v6_rcv_saddr, &sk->sk_v6_daddr); |
dd2e0b86 ED |
2051 | } |
2052 | ||
35b2c321 | 2053 | const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
2054 | .queue_xmit = inet6_csk_xmit, |
2055 | .send_check = tcp_v6_send_check, | |
2056 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 2057 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
2058 | .conn_request = tcp_v6_conn_request, |
2059 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
2060 | .net_header_len = sizeof(struct ipv6hdr), |
2061 | .setsockopt = ipv6_setsockopt, | |
2062 | .getsockopt = ipv6_getsockopt, | |
2063 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
2064 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
4fab9071 | 2065 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 LT |
2066 | }; |
2067 | ||
4954f17d | 2068 | #if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) |
b2e4b3de | 2069 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
4954f17d | 2070 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 | 2071 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 2072 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 2073 | .md5_parse = tcp_v6_parse_md5_keys, |
4954f17d DS |
2074 | #endif |
2075 | #ifdef CONFIG_TCP_AO | |
0aadc739 | 2076 | .ao_lookup = tcp_v6_ao_lookup, |
1e03d32b | 2077 | .calc_ao_hash = tcp_v6_ao_hash_skb, |
4954f17d | 2078 | .ao_parse = tcp_v6_parse_ao, |
7c2ffaf2 | 2079 | .ao_calc_key_sk = tcp_v6_ao_calc_key_sk, |
4954f17d | 2080 | #endif |
cfb6eeb4 | 2081 | }; |
a928630a | 2082 | #endif |
cfb6eeb4 | 2083 | |
1da177e4 LT |
2084 | /* |
2085 | * TCP over IPv4 via INET6 API | |
2086 | */ | |
3b401a81 | 2087 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
2088 | .queue_xmit = ip_queue_xmit, |
2089 | .send_check = tcp_v4_send_check, | |
2090 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 2091 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
2092 | .conn_request = tcp_v6_conn_request, |
2093 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
2094 | .net_header_len = sizeof(struct iphdr), |
2095 | .setsockopt = ipv6_setsockopt, | |
2096 | .getsockopt = ipv6_getsockopt, | |
2097 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
2098 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
4fab9071 | 2099 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 LT |
2100 | }; |
2101 | ||
4954f17d | 2102 | #if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) |
b2e4b3de | 2103 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
4954f17d | 2104 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 | 2105 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 2106 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 2107 | .md5_parse = tcp_v6_parse_md5_keys, |
4954f17d DS |
2108 | #endif |
2109 | #ifdef CONFIG_TCP_AO | |
0aadc739 | 2110 | .ao_lookup = tcp_v6_ao_lookup, |
1e03d32b | 2111 | .calc_ao_hash = tcp_v4_ao_hash_skb, |
4954f17d | 2112 | .ao_parse = tcp_v6_parse_ao, |
0a3a8090 | 2113 | .ao_calc_key_sk = tcp_v4_ao_calc_key_sk, |
4954f17d | 2114 | #endif |
cfb6eeb4 | 2115 | }; |
a928630a | 2116 | #endif |
cfb6eeb4 | 2117 | |
1da177e4 LT |
2118 | /* NOTE: A lot of things set to zero explicitly by call to |
2119 | * sk_alloc() so need not be done here. | |
2120 | */ | |
2121 | static int tcp_v6_init_sock(struct sock *sk) | |
2122 | { | |
6687e988 | 2123 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 2124 | |
900f65d3 | 2125 | tcp_init_sock(sk); |
1da177e4 | 2126 | |
8292a17a | 2127 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 2128 | |
4954f17d | 2129 | #if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) |
ac807fa8 | 2130 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
2131 | #endif |
2132 | ||
1da177e4 LT |
2133 | return 0; |
2134 | } | |
2135 | ||
952a10be | 2136 | #ifdef CONFIG_PROC_FS |
1da177e4 | 2137 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 2138 | static void get_openreq6(struct seq_file *seq, |
aa3a0c8c | 2139 | const struct request_sock *req, int i) |
1da177e4 | 2140 | { |
fa76ce73 | 2141 | long ttd = req->rsk_timer.expires - jiffies; |
634fb979 ED |
2142 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
2143 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
2144 | |
2145 | if (ttd < 0) | |
2146 | ttd = 0; | |
2147 | ||
1da177e4 LT |
2148 | seq_printf(seq, |
2149 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 2150 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
2151 | i, |
2152 | src->s6_addr32[0], src->s6_addr32[1], | |
2153 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 2154 | inet_rsk(req)->ir_num, |
1da177e4 LT |
2155 | dest->s6_addr32[0], dest->s6_addr32[1], |
2156 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 2157 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 2158 | TCP_SYN_RECV, |
4c99aa40 | 2159 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
2160 | 1, /* timers active (only the expire timer) */ |
2161 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 2162 | req->num_timeout, |
aa3a0c8c ED |
2163 | from_kuid_munged(seq_user_ns(seq), |
2164 | sock_i_uid(req->rsk_listener)), | |
1ab1457c | 2165 | 0, /* non standard timer */ |
1da177e4 LT |
2166 | 0, /* open_requests have no inode */ |
2167 | 0, req); | |
2168 | } | |
2169 | ||
2170 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
2171 | { | |
b71d1d42 | 2172 | const struct in6_addr *dest, *src; |
1da177e4 LT |
2173 | __u16 destp, srcp; |
2174 | int timer_active; | |
2175 | unsigned long timer_expires; | |
cf533ea5 ED |
2176 | const struct inet_sock *inet = inet_sk(sp); |
2177 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 2178 | const struct inet_connection_sock *icsk = inet_csk(sp); |
0536fcc0 | 2179 | const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq; |
00fd38d9 ED |
2180 | int rx_queue; |
2181 | int state; | |
1da177e4 | 2182 | |
efe4208f ED |
2183 | dest = &sp->sk_v6_daddr; |
2184 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
2185 | destp = ntohs(inet->inet_dport); |
2186 | srcp = ntohs(inet->inet_sport); | |
463c84b9 | 2187 | |
ce3cf4ec | 2188 | if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
57dde7f7 | 2189 | icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT || |
ce3cf4ec | 2190 | icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { |
1da177e4 | 2191 | timer_active = 1; |
463c84b9 ACM |
2192 | timer_expires = icsk->icsk_timeout; |
2193 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 2194 | timer_active = 4; |
463c84b9 | 2195 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
2196 | } else if (timer_pending(&sp->sk_timer)) { |
2197 | timer_active = 2; | |
2198 | timer_expires = sp->sk_timer.expires; | |
2199 | } else { | |
2200 | timer_active = 0; | |
2201 | timer_expires = jiffies; | |
2202 | } | |
2203 | ||
986ffdfd | 2204 | state = inet_sk_state_load(sp); |
00fd38d9 | 2205 | if (state == TCP_LISTEN) |
288efe86 | 2206 | rx_queue = READ_ONCE(sp->sk_ack_backlog); |
00fd38d9 ED |
2207 | else |
2208 | /* Because we don't lock the socket, | |
2209 | * we might find a transient negative value. | |
2210 | */ | |
dba7d9b8 | 2211 | rx_queue = max_t(int, READ_ONCE(tp->rcv_nxt) - |
7db48e98 | 2212 | READ_ONCE(tp->copied_seq), 0); |
00fd38d9 | 2213 | |
1da177e4 LT |
2214 | seq_printf(seq, |
2215 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 2216 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
2217 | i, |
2218 | src->s6_addr32[0], src->s6_addr32[1], | |
2219 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2220 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2221 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
00fd38d9 | 2222 | state, |
0f317464 | 2223 | READ_ONCE(tp->write_seq) - tp->snd_una, |
00fd38d9 | 2224 | rx_queue, |
1da177e4 | 2225 | timer_active, |
a399a805 | 2226 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 2227 | icsk->icsk_retransmits, |
a7cb5a49 | 2228 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 2229 | icsk->icsk_probes_out, |
1da177e4 | 2230 | sock_i_ino(sp), |
41c6d650 | 2231 | refcount_read(&sp->sk_refcnt), sp, |
7be87351 SH |
2232 | jiffies_to_clock_t(icsk->icsk_rto), |
2233 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
31954cd8 | 2234 | (icsk->icsk_ack.quick << 1) | inet_csk_in_pingpong_mode(sp), |
40570375 | 2235 | tcp_snd_cwnd(tp), |
00fd38d9 | 2236 | state == TCP_LISTEN ? |
0536fcc0 | 2237 | fastopenq->max_qlen : |
0a672f74 | 2238 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) |
1da177e4 LT |
2239 | ); |
2240 | } | |
2241 | ||
1ab1457c | 2242 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 2243 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 2244 | { |
789f558c | 2245 | long delta = tw->tw_timer.expires - jiffies; |
b71d1d42 | 2246 | const struct in6_addr *dest, *src; |
1da177e4 | 2247 | __u16 destp, srcp; |
1da177e4 | 2248 | |
efe4208f ED |
2249 | dest = &tw->tw_v6_daddr; |
2250 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
2251 | destp = ntohs(tw->tw_dport); |
2252 | srcp = ntohs(tw->tw_sport); | |
2253 | ||
2254 | seq_printf(seq, | |
2255 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 2256 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
2257 | i, |
2258 | src->s6_addr32[0], src->s6_addr32[1], | |
2259 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2260 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2261 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2262 | tw->tw_substate, 0, 0, | |
a399a805 | 2263 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
41c6d650 | 2264 | refcount_read(&tw->tw_refcnt), tw); |
1da177e4 LT |
2265 | } |
2266 | ||
1da177e4 LT |
2267 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
2268 | { | |
2269 | struct tcp_iter_state *st; | |
05dbc7b5 | 2270 | struct sock *sk = v; |
1da177e4 LT |
2271 | |
2272 | if (v == SEQ_START_TOKEN) { | |
2273 | seq_puts(seq, | |
2274 | " sl " | |
2275 | "local_address " | |
2276 | "remote_address " | |
2277 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2278 | " uid timeout inode\n"); | |
2279 | goto out; | |
2280 | } | |
2281 | st = seq->private; | |
2282 | ||
079096f1 ED |
2283 | if (sk->sk_state == TCP_TIME_WAIT) |
2284 | get_timewait6_sock(seq, v, st->num); | |
2285 | else if (sk->sk_state == TCP_NEW_SYN_RECV) | |
aa3a0c8c | 2286 | get_openreq6(seq, v, st->num); |
079096f1 ED |
2287 | else |
2288 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
2289 | out: |
2290 | return 0; | |
2291 | } | |
2292 | ||
37d849bb CH |
2293 | static const struct seq_operations tcp6_seq_ops = { |
2294 | .show = tcp6_seq_show, | |
2295 | .start = tcp_seq_start, | |
2296 | .next = tcp_seq_next, | |
2297 | .stop = tcp_seq_stop, | |
2298 | }; | |
2299 | ||
1da177e4 | 2300 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 | 2301 | .family = AF_INET6, |
1da177e4 LT |
2302 | }; |
2303 | ||
2c8c1e72 | 2304 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 2305 | { |
c3506372 CH |
2306 | if (!proc_create_net_data("tcp6", 0444, net->proc_net, &tcp6_seq_ops, |
2307 | sizeof(struct tcp_iter_state), &tcp6_seq_afinfo)) | |
37d849bb CH |
2308 | return -ENOMEM; |
2309 | return 0; | |
1da177e4 LT |
2310 | } |
2311 | ||
6f8b13bc | 2312 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2313 | { |
37d849bb | 2314 | remove_proc_entry("tcp6", net->proc_net); |
1da177e4 LT |
2315 | } |
2316 | #endif | |
2317 | ||
2318 | struct proto tcpv6_prot = { | |
2319 | .name = "TCPv6", | |
2320 | .owner = THIS_MODULE, | |
2321 | .close = tcp_close, | |
d74bad4e | 2322 | .pre_connect = tcp_v6_pre_connect, |
1da177e4 LT |
2323 | .connect = tcp_v6_connect, |
2324 | .disconnect = tcp_disconnect, | |
463c84b9 | 2325 | .accept = inet_csk_accept, |
1da177e4 LT |
2326 | .ioctl = tcp_ioctl, |
2327 | .init = tcp_v6_init_sock, | |
b5fc2923 | 2328 | .destroy = tcp_v4_destroy_sock, |
1da177e4 LT |
2329 | .shutdown = tcp_shutdown, |
2330 | .setsockopt = tcp_setsockopt, | |
2331 | .getsockopt = tcp_getsockopt, | |
9cacf81f | 2332 | .bpf_bypass_getsockopt = tcp_bpf_bypass_getsockopt, |
4b9d07a4 | 2333 | .keepalive = tcp_set_keepalive, |
1da177e4 | 2334 | .recvmsg = tcp_recvmsg, |
7ba42910 | 2335 | .sendmsg = tcp_sendmsg, |
1d7e4538 | 2336 | .splice_eof = tcp_splice_eof, |
1da177e4 | 2337 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 2338 | .release_cb = tcp_release_cb, |
496611d7 | 2339 | .hash = inet6_hash, |
ab1e0a13 ACM |
2340 | .unhash = inet_unhash, |
2341 | .get_port = inet_csk_get_port, | |
91a760b2 | 2342 | .put_port = inet_put_port, |
8a59f9d1 CW |
2343 | #ifdef CONFIG_BPF_SYSCALL |
2344 | .psock_update_sk_prot = tcp_bpf_update_proto, | |
2345 | #endif | |
1da177e4 | 2346 | .enter_memory_pressure = tcp_enter_memory_pressure, |
06044751 | 2347 | .leave_memory_pressure = tcp_leave_memory_pressure, |
c9bee3b7 | 2348 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 | 2349 | .sockets_allocated = &tcp_sockets_allocated, |
0defbb0a | 2350 | |
1da177e4 | 2351 | .memory_allocated = &tcp_memory_allocated, |
0defbb0a ED |
2352 | .per_cpu_fw_alloc = &tcp_memory_per_cpu_fw_alloc, |
2353 | ||
1da177e4 | 2354 | .memory_pressure = &tcp_memory_pressure, |
0a5578cf | 2355 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 2356 | .sysctl_mem = sysctl_tcp_mem, |
356d1833 ED |
2357 | .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem), |
2358 | .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_tcp_rmem), | |
1da177e4 LT |
2359 | .max_header = MAX_TCP_HEADER, |
2360 | .obj_size = sizeof(struct tcp6_sock), | |
f5f80e32 | 2361 | .ipv6_pinfo_offset = offsetof(struct tcp6_sock, inet6), |
5f0d5a3a | 2362 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
6d6ee43e | 2363 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2364 | .rsk_prot = &tcp6_request_sock_ops, |
429e42c1 | 2365 | .h.hashinfo = NULL, |
7ba42910 | 2366 | .no_autobind = true, |
c1e64e29 | 2367 | .diag_destroy = tcp_abort, |
1da177e4 | 2368 | }; |
6abde0b2 | 2369 | EXPORT_SYMBOL_GPL(tcpv6_prot); |
1da177e4 | 2370 | |
1da177e4 | 2371 | |
1da177e4 LT |
2372 | static struct inet_protosw tcpv6_protosw = { |
2373 | .type = SOCK_STREAM, | |
2374 | .protocol = IPPROTO_TCP, | |
2375 | .prot = &tcpv6_prot, | |
2376 | .ops = &inet6_stream_ops, | |
d83d8461 ACM |
2377 | .flags = INET_PROTOSW_PERMANENT | |
2378 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2379 | }; |
2380 | ||
2c8c1e72 | 2381 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 2382 | { |
5677242f DL |
2383 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2384 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2385 | } |
2386 | ||
2c8c1e72 | 2387 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 2388 | { |
5677242f | 2389 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
2390 | } |
2391 | ||
93ec926b | 2392 | static struct pernet_operations tcpv6_net_ops = { |
b099ce26 EB |
2393 | .init = tcpv6_net_init, |
2394 | .exit = tcpv6_net_exit, | |
93ec926b DL |
2395 | }; |
2396 | ||
7f4e4868 | 2397 | int __init tcpv6_init(void) |
1da177e4 | 2398 | { |
7f4e4868 DL |
2399 | int ret; |
2400 | ||
4ea0875b ED |
2401 | net_hotdata.tcpv6_protocol = (struct inet6_protocol) { |
2402 | .handler = tcp_v6_rcv, | |
2403 | .err_handler = tcp_v6_err, | |
2404 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
2405 | }; | |
2406 | ret = inet6_add_protocol(&net_hotdata.tcpv6_protocol, IPPROTO_TCP); | |
3336288a | 2407 | if (ret) |
c6b641a4 | 2408 | goto out; |
3336288a | 2409 | |
1da177e4 | 2410 | /* register inet6 protocol */ |
7f4e4868 DL |
2411 | ret = inet6_register_protosw(&tcpv6_protosw); |
2412 | if (ret) | |
2413 | goto out_tcpv6_protocol; | |
2414 | ||
93ec926b | 2415 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2416 | if (ret) |
2417 | goto out_tcpv6_protosw; | |
f870fa0b MM |
2418 | |
2419 | ret = mptcpv6_init(); | |
2420 | if (ret) | |
2421 | goto out_tcpv6_pernet_subsys; | |
2422 | ||
7f4e4868 DL |
2423 | out: |
2424 | return ret; | |
ae0f7d5f | 2425 | |
f870fa0b MM |
2426 | out_tcpv6_pernet_subsys: |
2427 | unregister_pernet_subsys(&tcpv6_net_ops); | |
7f4e4868 DL |
2428 | out_tcpv6_protosw: |
2429 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a | 2430 | out_tcpv6_protocol: |
4ea0875b | 2431 | inet6_del_protocol(&net_hotdata.tcpv6_protocol, IPPROTO_TCP); |
7f4e4868 DL |
2432 | goto out; |
2433 | } | |
2434 | ||
09f7709f | 2435 | void tcpv6_exit(void) |
7f4e4868 | 2436 | { |
93ec926b | 2437 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 | 2438 | inet6_unregister_protosw(&tcpv6_protosw); |
4ea0875b | 2439 | inet6_del_protocol(&net_hotdata.tcpv6_protocol, IPPROTO_TCP); |
1da177e4 | 2440 | } |