Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Implementation of the Transmission Control Protocol(TCP). | |
7 | * | |
1da177e4 LT |
8 | * IPv4 specific functions |
9 | * | |
10 | * | |
11 | * code split from: | |
12 | * linux/ipv4/tcp.c | |
13 | * linux/ipv4/tcp_input.c | |
14 | * linux/ipv4/tcp_output.c | |
15 | * | |
16 | * See tcp.c for author information | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or | |
19 | * modify it under the terms of the GNU General Public License | |
20 | * as published by the Free Software Foundation; either version | |
21 | * 2 of the License, or (at your option) any later version. | |
22 | */ | |
23 | ||
24 | /* | |
25 | * Changes: | |
26 | * David S. Miller : New socket lookup architecture. | |
27 | * This code is dedicated to John Dyson. | |
28 | * David S. Miller : Change semantics of established hash, | |
29 | * half is devoted to TIME_WAIT sockets | |
30 | * and the rest go in the other half. | |
31 | * Andi Kleen : Add support for syncookies and fixed | |
32 | * some bugs: ip options weren't passed to | |
33 | * the TCP layer, missed a check for an | |
34 | * ACK bit. | |
35 | * Andi Kleen : Implemented fast path mtu discovery. | |
36 | * Fixed many serious bugs in the | |
60236fdd | 37 | * request_sock handling and moved |
1da177e4 LT |
38 | * most of it into the af independent code. |
39 | * Added tail drop and some other bugfixes. | |
caa20d9a | 40 | * Added new listen semantics. |
1da177e4 LT |
41 | * Mike McLagan : Routing by source |
42 | * Juan Jose Ciarlante: ip_dynaddr bits | |
43 | * Andi Kleen: various fixes. | |
44 | * Vitaly E. Lavrov : Transparent proxy revived after year | |
45 | * coma. | |
46 | * Andi Kleen : Fix new listen. | |
47 | * Andi Kleen : Fix accept error reporting. | |
48 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
49 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
50 | * a single port at the same time. | |
51 | */ | |
52 | ||
afd46503 | 53 | #define pr_fmt(fmt) "TCP: " fmt |
1da177e4 | 54 | |
eb4dea58 | 55 | #include <linux/bottom_half.h> |
1da177e4 LT |
56 | #include <linux/types.h> |
57 | #include <linux/fcntl.h> | |
58 | #include <linux/module.h> | |
59 | #include <linux/random.h> | |
60 | #include <linux/cache.h> | |
61 | #include <linux/jhash.h> | |
62 | #include <linux/init.h> | |
63 | #include <linux/times.h> | |
5a0e3ad6 | 64 | #include <linux/slab.h> |
1da177e4 | 65 | |
457c4cbc | 66 | #include <net/net_namespace.h> |
1da177e4 | 67 | #include <net/icmp.h> |
304a1618 | 68 | #include <net/inet_hashtables.h> |
1da177e4 | 69 | #include <net/tcp.h> |
1cac41cb MB |
70 | #ifdef CONFIG_MPTCP |
71 | #include <net/mptcp.h> | |
72 | #include <net/mptcp_v4.h> | |
73 | #endif | |
20380731 | 74 | #include <net/transp_v6.h> |
1da177e4 LT |
75 | #include <net/ipv6.h> |
76 | #include <net/inet_common.h> | |
6d6ee43e | 77 | #include <net/timewait_sock.h> |
1da177e4 | 78 | #include <net/xfrm.h> |
6e5714ea | 79 | #include <net/secure_seq.h> |
d1a4c0b3 | 80 | #include <net/tcp_memcontrol.h> |
076bb0c8 | 81 | #include <net/busy_poll.h> |
1da177e4 LT |
82 | |
83 | #include <linux/inet.h> | |
84 | #include <linux/ipv6.h> | |
85 | #include <linux/stddef.h> | |
86 | #include <linux/proc_fs.h> | |
87 | #include <linux/seq_file.h> | |
88 | ||
cfb6eeb4 YH |
89 | #include <linux/crypto.h> |
90 | #include <linux/scatterlist.h> | |
91 | ||
ab32ea5d BH |
92 | int sysctl_tcp_tw_reuse __read_mostly; |
93 | int sysctl_tcp_low_latency __read_mostly; | |
4bc2f18b | 94 | EXPORT_SYMBOL(sysctl_tcp_low_latency); |
1da177e4 | 95 | |
cfb6eeb4 | 96 | #ifdef CONFIG_TCP_MD5SIG |
a915da9b | 97 | static int tcp_v4_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, |
318cf7aa | 98 | __be32 daddr, __be32 saddr, const struct tcphdr *th); |
cfb6eeb4 YH |
99 | #endif |
100 | ||
5caea4ea | 101 | struct inet_hashinfo tcp_hashinfo; |
4bc2f18b | 102 | EXPORT_SYMBOL(tcp_hashinfo); |
1da177e4 | 103 | |
936b8bdb | 104 | static __u32 tcp_v4_init_sequence(const struct sk_buff *skb) |
1da177e4 | 105 | { |
eddc9ec5 ACM |
106 | return secure_tcp_sequence_number(ip_hdr(skb)->daddr, |
107 | ip_hdr(skb)->saddr, | |
aa8223c7 ACM |
108 | tcp_hdr(skb)->dest, |
109 | tcp_hdr(skb)->source); | |
1da177e4 LT |
110 | } |
111 | ||
6d6ee43e ACM |
112 | int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp) |
113 | { | |
114 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sktw); | |
115 | struct tcp_sock *tp = tcp_sk(sk); | |
116 | ||
117 | /* With PAWS, it is safe from the viewpoint | |
118 | of data integrity. Even without PAWS it is safe provided sequence | |
119 | spaces do not overlap i.e. at data rates <= 80Mbit/sec. | |
120 | ||
121 | Actually, the idea is close to VJ's one, only timestamp cache is | |
122 | held not per host, but per port pair and TW bucket is used as state | |
123 | holder. | |
124 | ||
125 | If TW bucket has been already destroyed we fall back to VJ's scheme | |
126 | and use initial timestamp retrieved from peer table. | |
127 | */ | |
128 | if (tcptw->tw_ts_recent_stamp && | |
51456b29 | 129 | (!twp || (sysctl_tcp_tw_reuse && |
9d729f72 | 130 | get_seconds() - tcptw->tw_ts_recent_stamp > 1))) { |
6d6ee43e ACM |
131 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; |
132 | if (tp->write_seq == 0) | |
133 | tp->write_seq = 1; | |
134 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; | |
135 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; | |
136 | sock_hold(sktw); | |
137 | return 1; | |
138 | } | |
139 | ||
140 | return 0; | |
141 | } | |
6d6ee43e ACM |
142 | EXPORT_SYMBOL_GPL(tcp_twsk_unique); |
143 | ||
1da177e4 LT |
144 | /* This will initiate an outgoing connection. */ |
145 | int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
146 | { | |
2d7192d6 | 147 | struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; |
1da177e4 LT |
148 | struct inet_sock *inet = inet_sk(sk); |
149 | struct tcp_sock *tp = tcp_sk(sk); | |
dca8b089 | 150 | __be16 orig_sport, orig_dport; |
bada8adc | 151 | __be32 daddr, nexthop; |
da905bd1 | 152 | struct flowi4 *fl4; |
2d7192d6 | 153 | struct rtable *rt; |
1da177e4 | 154 | int err; |
f6d8bd05 | 155 | struct ip_options_rcu *inet_opt; |
1da177e4 LT |
156 | |
157 | if (addr_len < sizeof(struct sockaddr_in)) | |
158 | return -EINVAL; | |
159 | ||
160 | if (usin->sin_family != AF_INET) | |
161 | return -EAFNOSUPPORT; | |
162 | ||
163 | nexthop = daddr = usin->sin_addr.s_addr; | |
f6d8bd05 ED |
164 | inet_opt = rcu_dereference_protected(inet->inet_opt, |
165 | sock_owned_by_user(sk)); | |
166 | if (inet_opt && inet_opt->opt.srr) { | |
1da177e4 LT |
167 | if (!daddr) |
168 | return -EINVAL; | |
f6d8bd05 | 169 | nexthop = inet_opt->opt.faddr; |
1da177e4 LT |
170 | } |
171 | ||
dca8b089 DM |
172 | orig_sport = inet->inet_sport; |
173 | orig_dport = usin->sin_port; | |
da905bd1 DM |
174 | fl4 = &inet->cork.fl.u.ip4; |
175 | rt = ip_route_connect(fl4, nexthop, inet->inet_saddr, | |
b23dd4fe DM |
176 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, |
177 | IPPROTO_TCP, | |
0e0d44ab | 178 | orig_sport, orig_dport, sk); |
b23dd4fe DM |
179 | if (IS_ERR(rt)) { |
180 | err = PTR_ERR(rt); | |
181 | if (err == -ENETUNREACH) | |
f1d8cba6 | 182 | IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); |
b23dd4fe | 183 | return err; |
584bdf8c | 184 | } |
1da177e4 LT |
185 | |
186 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { | |
187 | ip_rt_put(rt); | |
188 | return -ENETUNREACH; | |
189 | } | |
190 | ||
f6d8bd05 | 191 | if (!inet_opt || !inet_opt->opt.srr) |
da905bd1 | 192 | daddr = fl4->daddr; |
1da177e4 | 193 | |
c720c7e8 | 194 | if (!inet->inet_saddr) |
da905bd1 | 195 | inet->inet_saddr = fl4->saddr; |
d1e559d0 | 196 | sk_rcv_saddr_set(sk, inet->inet_saddr); |
1da177e4 | 197 | |
c720c7e8 | 198 | if (tp->rx_opt.ts_recent_stamp && inet->inet_daddr != daddr) { |
1da177e4 LT |
199 | /* Reset inherited state */ |
200 | tp->rx_opt.ts_recent = 0; | |
201 | tp->rx_opt.ts_recent_stamp = 0; | |
ee995283 PE |
202 | if (likely(!tp->repair)) |
203 | tp->write_seq = 0; | |
1da177e4 LT |
204 | } |
205 | ||
295ff7ed | 206 | if (tcp_death_row.sysctl_tw_recycle && |
81166dd6 DM |
207 | !tp->rx_opt.ts_recent_stamp && fl4->daddr == daddr) |
208 | tcp_fetch_timewait_stamp(sk, &rt->dst); | |
1da177e4 | 209 | |
c720c7e8 | 210 | inet->inet_dport = usin->sin_port; |
d1e559d0 | 211 | sk_daddr_set(sk, daddr); |
1da177e4 | 212 | |
d83d8461 | 213 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
f6d8bd05 ED |
214 | if (inet_opt) |
215 | inet_csk(sk)->icsk_ext_hdr_len = inet_opt->opt.optlen; | |
1da177e4 | 216 | |
bee7ca9e | 217 | tp->rx_opt.mss_clamp = TCP_MSS_DEFAULT; |
1da177e4 LT |
218 | |
219 | /* Socket identity is still unknown (sport may be zero). | |
220 | * However we set state to SYN-SENT and not releasing socket | |
221 | * lock select source port, enter ourselves into the hash tables and | |
222 | * complete initialization after this. | |
223 | */ | |
224 | tcp_set_state(sk, TCP_SYN_SENT); | |
a7f5e7f1 | 225 | err = inet_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
226 | if (err) |
227 | goto failure; | |
228 | ||
877d1f62 | 229 | sk_set_txhash(sk); |
9e7ceb06 | 230 | |
da905bd1 | 231 | rt = ip_route_newports(fl4, rt, orig_sport, orig_dport, |
b23dd4fe DM |
232 | inet->inet_sport, inet->inet_dport, sk); |
233 | if (IS_ERR(rt)) { | |
234 | err = PTR_ERR(rt); | |
235 | rt = NULL; | |
1da177e4 | 236 | goto failure; |
b23dd4fe | 237 | } |
1da177e4 | 238 | /* OK, now commit destination to socket. */ |
bcd76111 | 239 | sk->sk_gso_type = SKB_GSO_TCPV4; |
d8d1f30b | 240 | sk_setup_caps(sk, &rt->dst); |
1da177e4 | 241 | |
ee995283 | 242 | if (!tp->write_seq && likely(!tp->repair)) |
c720c7e8 ED |
243 | tp->write_seq = secure_tcp_sequence_number(inet->inet_saddr, |
244 | inet->inet_daddr, | |
245 | inet->inet_sport, | |
1da177e4 LT |
246 | usin->sin_port); |
247 | ||
c720c7e8 | 248 | inet->inet_id = tp->write_seq ^ jiffies; |
1da177e4 | 249 | |
2b916477 | 250 | err = tcp_connect(sk); |
ee995283 | 251 | |
1da177e4 LT |
252 | rt = NULL; |
253 | if (err) | |
254 | goto failure; | |
255 | ||
256 | return 0; | |
257 | ||
258 | failure: | |
7174259e ACM |
259 | /* |
260 | * This unhashes the socket and releases the local port, | |
261 | * if necessary. | |
262 | */ | |
1da177e4 LT |
263 | tcp_set_state(sk, TCP_CLOSE); |
264 | ip_rt_put(rt); | |
265 | sk->sk_route_caps = 0; | |
c720c7e8 | 266 | inet->inet_dport = 0; |
1da177e4 LT |
267 | return err; |
268 | } | |
4bc2f18b | 269 | EXPORT_SYMBOL(tcp_v4_connect); |
1da177e4 | 270 | |
1da177e4 | 271 | /* |
563d34d0 ED |
272 | * This routine reacts to ICMP_FRAG_NEEDED mtu indications as defined in RFC1191. |
273 | * It can be called through tcp_release_cb() if socket was owned by user | |
274 | * at the time tcp_v4_err() was called to handle ICMP message. | |
1da177e4 | 275 | */ |
4fab9071 | 276 | void tcp_v4_mtu_reduced(struct sock *sk) |
1da177e4 | 277 | { |
1da177e4 | 278 | struct inet_sock *inet = inet_sk(sk); |
2681a785 ED |
279 | struct dst_entry *dst; |
280 | u32 mtu; | |
1da177e4 | 281 | |
2681a785 ED |
282 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) |
283 | return; | |
284 | mtu = tcp_sk(sk)->mtu_info; | |
80d0a69f DM |
285 | dst = inet_csk_update_pmtu(sk, mtu); |
286 | if (!dst) | |
1da177e4 LT |
287 | return; |
288 | ||
1da177e4 LT |
289 | /* Something is about to be wrong... Remember soft error |
290 | * for the case, if this connection will not able to recover. | |
291 | */ | |
292 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) | |
293 | sk->sk_err_soft = EMSGSIZE; | |
294 | ||
295 | mtu = dst_mtu(dst); | |
296 | ||
297 | if (inet->pmtudisc != IP_PMTUDISC_DONT && | |
482fc609 | 298 | ip_sk_accept_pmtu(sk) && |
d83d8461 | 299 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
1da177e4 LT |
300 | tcp_sync_mss(sk, mtu); |
301 | ||
302 | /* Resend the TCP packet because it's | |
303 | * clear that the old packet has been | |
304 | * dropped. This is the new "fast" path mtu | |
305 | * discovery. | |
306 | */ | |
307 | tcp_simple_retransmit(sk); | |
308 | } /* else let the usual retransmit timer handle it */ | |
309 | } | |
4fab9071 | 310 | EXPORT_SYMBOL(tcp_v4_mtu_reduced); |
1da177e4 | 311 | |
55be7a9c DM |
312 | static void do_redirect(struct sk_buff *skb, struct sock *sk) |
313 | { | |
314 | struct dst_entry *dst = __sk_dst_check(sk, 0); | |
315 | ||
1ed5c48f | 316 | if (dst) |
6700c270 | 317 | dst->ops->redirect(dst, sk, skb); |
55be7a9c DM |
318 | } |
319 | ||
26e37360 ED |
320 | |
321 | /* handle ICMP messages on TCP_NEW_SYN_RECV request sockets */ | |
2679161c | 322 | void tcp_req_err(struct sock *sk, u32 seq, bool abort) |
26e37360 ED |
323 | { |
324 | struct request_sock *req = inet_reqsk(sk); | |
325 | struct net *net = sock_net(sk); | |
326 | ||
327 | /* ICMPs are not backlogged, hence we cannot get | |
328 | * an established socket here. | |
329 | */ | |
26e37360 ED |
330 | if (seq != tcp_rsk(req)->snt_isn) { |
331 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); | |
2679161c | 332 | } else if (abort) { |
26e37360 ED |
333 | /* |
334 | * Still in SYN_RECV, just remove it silently. | |
335 | * There is no good way to pass the error to the newly | |
336 | * created socket, and POSIX does not want network | |
337 | * errors returned from accept(). | |
338 | */ | |
c6973669 | 339 | inet_csk_reqsk_queue_drop(req->rsk_listener, req); |
ef84d8ce | 340 | NET_INC_STATS_BH(net, LINUX_MIB_LISTENDROPS); |
26e37360 | 341 | } |
ef84d8ce | 342 | reqsk_put(req); |
26e37360 ED |
343 | } |
344 | EXPORT_SYMBOL(tcp_req_err); | |
345 | ||
1da177e4 LT |
346 | /* |
347 | * This routine is called by the ICMP module when it gets some | |
348 | * sort of error condition. If err < 0 then the socket should | |
349 | * be closed and the error returned to the user. If err > 0 | |
350 | * it's just the icmp type << 8 | icmp code. After adjustment | |
351 | * header points to the first 8 bytes of the tcp header. We need | |
352 | * to find the appropriate port. | |
353 | * | |
354 | * The locking strategy used here is very "optimistic". When | |
355 | * someone else accesses the socket the ICMP is just dropped | |
356 | * and for some paths there is no check at all. | |
357 | * A more general error queue to queue errors for later handling | |
358 | * is probably better. | |
359 | * | |
360 | */ | |
361 | ||
4d1a2d9e | 362 | void tcp_v4_err(struct sk_buff *icmp_skb, u32 info) |
1da177e4 | 363 | { |
b71d1d42 | 364 | const struct iphdr *iph = (const struct iphdr *)icmp_skb->data; |
4d1a2d9e | 365 | struct tcphdr *th = (struct tcphdr *)(icmp_skb->data + (iph->ihl << 2)); |
f1ecd5d9 | 366 | struct inet_connection_sock *icsk; |
1da177e4 LT |
367 | struct tcp_sock *tp; |
368 | struct inet_sock *inet; | |
4d1a2d9e DL |
369 | const int type = icmp_hdr(icmp_skb)->type; |
370 | const int code = icmp_hdr(icmp_skb)->code; | |
1da177e4 | 371 | struct sock *sk; |
1cac41cb MB |
372 | #ifdef CONFIG_MPTCP |
373 | struct sock *meta_sk; | |
374 | #endif | |
f1ecd5d9 | 375 | struct sk_buff *skb; |
0a672f74 YC |
376 | struct request_sock *fastopen; |
377 | __u32 seq, snd_una; | |
f1ecd5d9 | 378 | __u32 remaining; |
1da177e4 | 379 | int err; |
4d1a2d9e | 380 | struct net *net = dev_net(icmp_skb->dev); |
1da177e4 | 381 | |
26e37360 ED |
382 | sk = __inet_lookup_established(net, &tcp_hashinfo, iph->daddr, |
383 | th->dest, iph->saddr, ntohs(th->source), | |
384 | inet_iif(icmp_skb)); | |
1da177e4 | 385 | if (!sk) { |
dcfc23ca | 386 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
1da177e4 LT |
387 | return; |
388 | } | |
389 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 390 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
391 | return; |
392 | } | |
26e37360 ED |
393 | seq = ntohl(th->seq); |
394 | if (sk->sk_state == TCP_NEW_SYN_RECV) | |
2679161c ED |
395 | return tcp_req_err(sk, seq, |
396 | type == ICMP_PARAMETERPROB || | |
397 | type == ICMP_TIME_EXCEEDED || | |
398 | (type == ICMP_DEST_UNREACH && | |
399 | (code == ICMP_NET_UNREACH || | |
400 | code == ICMP_HOST_UNREACH))); | |
1da177e4 | 401 | |
1cac41cb MB |
402 | #ifdef CONFIG_MPTCP |
403 | tp = tcp_sk(sk); | |
404 | if (mptcp(tp)) | |
405 | meta_sk = mptcp_meta_sk(sk); | |
406 | else | |
407 | meta_sk = sk; | |
408 | ||
409 | bh_lock_sock(meta_sk); | |
410 | #else | |
1da177e4 | 411 | bh_lock_sock(sk); |
1cac41cb | 412 | #endif |
1da177e4 LT |
413 | /* If too many ICMPs get dropped on busy |
414 | * servers this needs to be solved differently. | |
563d34d0 ED |
415 | * We do take care of PMTU discovery (RFC1191) special case : |
416 | * we can receive locally generated ICMP messages while socket is held. | |
1da177e4 | 417 | */ |
1cac41cb MB |
418 | #ifdef CONFIG_MPTCP |
419 | if (sock_owned_by_user(meta_sk)) { | |
420 | #else | |
b74aa930 | 421 | if (sock_owned_by_user(sk)) { |
1cac41cb | 422 | #endif |
b74aa930 ED |
423 | if (!(type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)) |
424 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); | |
425 | } | |
1da177e4 LT |
426 | if (sk->sk_state == TCP_CLOSE) |
427 | goto out; | |
428 | ||
97e3ecd1 | 429 | if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { |
430 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
431 | goto out; | |
432 | } | |
433 | ||
f1ecd5d9 | 434 | icsk = inet_csk(sk); |
1cac41cb | 435 | #ifndef CONFIG_MPTCP |
1da177e4 | 436 | tp = tcp_sk(sk); |
1cac41cb | 437 | #endif |
0a672f74 YC |
438 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
439 | fastopen = tp->fastopen_rsk; | |
440 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; | |
1da177e4 | 441 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 442 | !between(seq, snd_una, tp->snd_nxt)) { |
de0744af | 443 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
444 | goto out; |
445 | } | |
446 | ||
447 | switch (type) { | |
55be7a9c | 448 | case ICMP_REDIRECT: |
4ab956b5 JM |
449 | if (!sock_owned_by_user(sk)) |
450 | do_redirect(icmp_skb, sk); | |
55be7a9c | 451 | goto out; |
1da177e4 LT |
452 | case ICMP_SOURCE_QUENCH: |
453 | /* Just silently ignore these. */ | |
454 | goto out; | |
455 | case ICMP_PARAMETERPROB: | |
456 | err = EPROTO; | |
457 | break; | |
458 | case ICMP_DEST_UNREACH: | |
459 | if (code > NR_ICMP_UNREACH) | |
460 | goto out; | |
461 | ||
462 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ | |
0d4f0608 ED |
463 | /* We are not interested in TCP_LISTEN and open_requests |
464 | * (SYN-ACKs send out by Linux are always <576bytes so | |
465 | * they should go through unfragmented). | |
466 | */ | |
467 | if (sk->sk_state == TCP_LISTEN) | |
468 | goto out; | |
469 | ||
563d34d0 | 470 | tp->mtu_info = info; |
1cac41cb MB |
471 | #ifdef CONFIG_MPTCP |
472 | if (!sock_owned_by_user(meta_sk)) { | |
473 | #else | |
144d56e9 | 474 | if (!sock_owned_by_user(sk)) { |
1cac41cb | 475 | #endif |
563d34d0 | 476 | tcp_v4_mtu_reduced(sk); |
144d56e9 ED |
477 | } else { |
478 | if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, &tp->tsq_flags)) | |
479 | sock_hold(sk); | |
1cac41cb MB |
480 | #ifdef CONFIG_MPTCP |
481 | if (mptcp(tp)) | |
482 | mptcp_tsq_flags(sk); | |
483 | #endif | |
144d56e9 | 484 | } |
1da177e4 LT |
485 | goto out; |
486 | } | |
487 | ||
488 | err = icmp_err_convert[code].errno; | |
f1ecd5d9 DL |
489 | /* check if icmp_skb allows revert of backoff |
490 | * (see draft-zimmermann-tcp-lcd) */ | |
491 | if (code != ICMP_NET_UNREACH && code != ICMP_HOST_UNREACH) | |
492 | break; | |
493 | if (seq != tp->snd_una || !icsk->icsk_retransmits || | |
0a672f74 | 494 | !icsk->icsk_backoff || fastopen) |
f1ecd5d9 DL |
495 | break; |
496 | ||
1cac41cb MB |
497 | #ifdef CONFIG_MPTCP |
498 | if (sock_owned_by_user(meta_sk)) | |
499 | #else | |
8f49c270 | 500 | if (sock_owned_by_user(sk)) |
1cac41cb | 501 | #endif |
8f49c270 DM |
502 | break; |
503 | ||
f1ecd5d9 | 504 | icsk->icsk_backoff--; |
fcdd1cf4 ED |
505 | icsk->icsk_rto = tp->srtt_us ? __tcp_set_rto(tp) : |
506 | TCP_TIMEOUT_INIT; | |
507 | icsk->icsk_rto = inet_csk_rto_backoff(icsk, TCP_RTO_MAX); | |
f1ecd5d9 DL |
508 | |
509 | skb = tcp_write_queue_head(sk); | |
510 | BUG_ON(!skb); | |
511 | ||
7faee5c0 ED |
512 | remaining = icsk->icsk_rto - |
513 | min(icsk->icsk_rto, | |
514 | tcp_time_stamp - tcp_skb_timestamp(skb)); | |
f1ecd5d9 DL |
515 | |
516 | if (remaining) { | |
517 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, | |
518 | remaining, TCP_RTO_MAX); | |
f1ecd5d9 DL |
519 | } else { |
520 | /* RTO revert clocked out retransmission. | |
521 | * Will retransmit now */ | |
1cac41cb MB |
522 | #ifdef CONFIG_MPTCP |
523 | tcp_sk(sk)->ops->retransmit_timer(sk); | |
524 | #else | |
525 | tcp_retransmit_timer(sk); | |
526 | #endif | |
527 | ||
f1ecd5d9 DL |
528 | } |
529 | ||
1da177e4 LT |
530 | break; |
531 | case ICMP_TIME_EXCEEDED: | |
532 | err = EHOSTUNREACH; | |
533 | break; | |
534 | default: | |
535 | goto out; | |
536 | } | |
537 | ||
538 | switch (sk->sk_state) { | |
1da177e4 | 539 | case TCP_SYN_SENT: |
0a672f74 YC |
540 | case TCP_SYN_RECV: |
541 | /* Only in fast or simultaneous open. If a fast open socket is | |
542 | * is already accepted it is treated as a connected one below. | |
543 | */ | |
51456b29 | 544 | if (fastopen && !fastopen->sk) |
0a672f74 YC |
545 | break; |
546 | ||
1cac41cb MB |
547 | #ifdef CONFIG_MPTCP |
548 | if (!sock_owned_by_user(meta_sk)) { | |
549 | #else | |
1da177e4 | 550 | if (!sock_owned_by_user(sk)) { |
1cac41cb | 551 | #endif |
1da177e4 LT |
552 | sk->sk_err = err; |
553 | ||
554 | sk->sk_error_report(sk); | |
555 | ||
556 | tcp_done(sk); | |
557 | } else { | |
558 | sk->sk_err_soft = err; | |
559 | } | |
560 | goto out; | |
561 | } | |
562 | ||
563 | /* If we've already connected we will keep trying | |
564 | * until we time out, or the user gives up. | |
565 | * | |
566 | * rfc1122 4.2.3.9 allows to consider as hard errors | |
567 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, | |
568 | * but it is obsoleted by pmtu discovery). | |
569 | * | |
570 | * Note, that in modern internet, where routing is unreliable | |
571 | * and in each dark corner broken firewalls sit, sending random | |
572 | * errors ordered by their masters even this two messages finally lose | |
573 | * their original sense (even Linux sends invalid PORT_UNREACHs) | |
574 | * | |
575 | * Now we are in compliance with RFCs. | |
576 | * --ANK (980905) | |
577 | */ | |
578 | ||
579 | inet = inet_sk(sk); | |
1cac41cb MB |
580 | #ifdef CONFIG_MPTCP |
581 | if (!sock_owned_by_user(meta_sk) && inet->recverr) { | |
582 | #else | |
1da177e4 | 583 | if (!sock_owned_by_user(sk) && inet->recverr) { |
1cac41cb | 584 | #endif |
1da177e4 LT |
585 | sk->sk_err = err; |
586 | sk->sk_error_report(sk); | |
587 | } else { /* Only an error on timeout */ | |
588 | sk->sk_err_soft = err; | |
589 | } | |
590 | ||
591 | out: | |
1cac41cb MB |
592 | #ifdef CONFIG_MPTCP |
593 | bh_unlock_sock(meta_sk); | |
594 | #else | |
1da177e4 | 595 | bh_unlock_sock(sk); |
1cac41cb | 596 | #endif |
1da177e4 LT |
597 | sock_put(sk); |
598 | } | |
599 | ||
28850dc7 | 600 | void __tcp_v4_send_check(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
1da177e4 | 601 | { |
aa8223c7 | 602 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 603 | |
84fa7933 | 604 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
419f9f89 | 605 | th->check = ~tcp_v4_check(skb->len, saddr, daddr, 0); |
663ead3b | 606 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 607 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 608 | } else { |
419f9f89 | 609 | th->check = tcp_v4_check(skb->len, saddr, daddr, |
07f0757a | 610 | csum_partial(th, |
1da177e4 LT |
611 | th->doff << 2, |
612 | skb->csum)); | |
613 | } | |
614 | } | |
615 | ||
419f9f89 | 616 | /* This routine computes an IPv4 TCP checksum. */ |
bb296246 | 617 | void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb) |
419f9f89 | 618 | { |
cf533ea5 | 619 | const struct inet_sock *inet = inet_sk(sk); |
419f9f89 HX |
620 | |
621 | __tcp_v4_send_check(skb, inet->inet_saddr, inet->inet_daddr); | |
622 | } | |
4bc2f18b | 623 | EXPORT_SYMBOL(tcp_v4_send_check); |
419f9f89 | 624 | |
1da177e4 LT |
625 | /* |
626 | * This routine will send an RST to the other tcp. | |
627 | * | |
628 | * Someone asks: why I NEVER use socket parameters (TOS, TTL etc.) | |
629 | * for reset. | |
630 | * Answer: if a packet caused RST, it is not for a socket | |
631 | * existing in our system, if it is matched to a socket, | |
632 | * it is just duplicate segment or bug in other side's TCP. | |
633 | * So that we build reply only basing on parameters | |
634 | * arrived with segment. | |
635 | * Exception: precedence violation. We do not implement it in any case. | |
636 | */ | |
637 | ||
1cac41cb MB |
638 | #ifndef CONFIG_MPTCP |
639 | static | |
640 | #endif | |
641 | void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb) | |
1da177e4 | 642 | { |
cf533ea5 | 643 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
644 | struct { |
645 | struct tcphdr th; | |
646 | #ifdef CONFIG_TCP_MD5SIG | |
714e85be | 647 | __be32 opt[(TCPOLEN_MD5SIG_ALIGNED >> 2)]; |
cfb6eeb4 YH |
648 | #endif |
649 | } rep; | |
1da177e4 | 650 | struct ip_reply_arg arg; |
cfb6eeb4 YH |
651 | #ifdef CONFIG_TCP_MD5SIG |
652 | struct tcp_md5sig_key *key; | |
658ddaaf SL |
653 | const __u8 *hash_location = NULL; |
654 | unsigned char newhash[16]; | |
655 | int genhash; | |
656 | struct sock *sk1 = NULL; | |
cfb6eeb4 | 657 | #endif |
a86b1e30 | 658 | struct net *net; |
1da177e4 LT |
659 | |
660 | /* Never send a reset in response to a reset. */ | |
661 | if (th->rst) | |
662 | return; | |
663 | ||
c3658e8d ED |
664 | /* If sk not NULL, it means we did a successful lookup and incoming |
665 | * route had to be correct. prequeue might have dropped our dst. | |
666 | */ | |
667 | if (!sk && skb_rtable(skb)->rt_type != RTN_LOCAL) | |
1da177e4 LT |
668 | return; |
669 | ||
670 | /* Swap the send and the receive. */ | |
cfb6eeb4 YH |
671 | memset(&rep, 0, sizeof(rep)); |
672 | rep.th.dest = th->source; | |
673 | rep.th.source = th->dest; | |
674 | rep.th.doff = sizeof(struct tcphdr) / 4; | |
675 | rep.th.rst = 1; | |
1da177e4 LT |
676 | |
677 | if (th->ack) { | |
cfb6eeb4 | 678 | rep.th.seq = th->ack_seq; |
1da177e4 | 679 | } else { |
cfb6eeb4 YH |
680 | rep.th.ack = 1; |
681 | rep.th.ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin + | |
682 | skb->len - (th->doff << 2)); | |
1da177e4 LT |
683 | } |
684 | ||
7174259e | 685 | memset(&arg, 0, sizeof(arg)); |
cfb6eeb4 YH |
686 | arg.iov[0].iov_base = (unsigned char *)&rep; |
687 | arg.iov[0].iov_len = sizeof(rep.th); | |
688 | ||
0f85feae | 689 | net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
cfb6eeb4 | 690 | #ifdef CONFIG_TCP_MD5SIG |
658ddaaf SL |
691 | hash_location = tcp_parse_md5sig_option(th); |
692 | if (!sk && hash_location) { | |
693 | /* | |
694 | * active side is lost. Try to find listening socket through | |
695 | * source port, and then find md5 key through listening socket. | |
696 | * we are not loose security here: | |
697 | * Incoming packet is checked with md5 hash with finding key, | |
698 | * no RST generated if md5 hash doesn't match. | |
699 | */ | |
0f85feae | 700 | sk1 = __inet_lookup_listener(net, |
da5e3630 TH |
701 | &tcp_hashinfo, ip_hdr(skb)->saddr, |
702 | th->source, ip_hdr(skb)->daddr, | |
658ddaaf SL |
703 | ntohs(th->source), inet_iif(skb)); |
704 | /* don't send rst if it can't find key */ | |
705 | if (!sk1) | |
706 | return; | |
707 | rcu_read_lock(); | |
708 | key = tcp_md5_do_lookup(sk1, (union tcp_md5_addr *) | |
709 | &ip_hdr(skb)->saddr, AF_INET); | |
710 | if (!key) | |
711 | goto release_sk1; | |
712 | ||
39f8e58e | 713 | genhash = tcp_v4_md5_hash_skb(newhash, key, NULL, skb); |
658ddaaf SL |
714 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
715 | goto release_sk1; | |
716 | } else { | |
717 | key = sk ? tcp_md5_do_lookup(sk, (union tcp_md5_addr *) | |
718 | &ip_hdr(skb)->saddr, | |
719 | AF_INET) : NULL; | |
720 | } | |
721 | ||
cfb6eeb4 YH |
722 | if (key) { |
723 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | | |
724 | (TCPOPT_NOP << 16) | | |
725 | (TCPOPT_MD5SIG << 8) | | |
726 | TCPOLEN_MD5SIG); | |
727 | /* Update length and the length the header thinks exists */ | |
728 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; | |
729 | rep.th.doff = arg.iov[0].iov_len / 4; | |
730 | ||
49a72dfb | 731 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[1], |
78e645cb IJ |
732 | key, ip_hdr(skb)->saddr, |
733 | ip_hdr(skb)->daddr, &rep.th); | |
cfb6eeb4 YH |
734 | } |
735 | #endif | |
eddc9ec5 ACM |
736 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
737 | ip_hdr(skb)->saddr, /* XXX */ | |
52cd5750 | 738 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
1da177e4 | 739 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; |
88ef4a5a | 740 | arg.flags = (sk && inet_sk(sk)->transparent) ? IP_REPLY_ARG_NOSRCCHECK : 0; |
e2446eaa | 741 | /* When socket is gone, all binding information is lost. |
4c675258 AK |
742 | * routing might fail in this case. No choice here, if we choose to force |
743 | * input interface, we will misroute in case of asymmetric route. | |
e2446eaa | 744 | */ |
4c675258 AK |
745 | if (sk) |
746 | arg.bound_dev_if = sk->sk_bound_dev_if; | |
1da177e4 | 747 | |
66b13d99 | 748 | arg.tos = ip_hdr(skb)->tos; |
344afd62 | 749 | arg.uid = sock_net_uid(net, sk && sk_fullsock(sk) ? sk : NULL); |
bdbbb852 ED |
750 | ip_send_unicast_reply(*this_cpu_ptr(net->ipv4.tcp_sk), |
751 | skb, &TCP_SKB_CB(skb)->header.h4.opt, | |
24a2d43d ED |
752 | ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, |
753 | &arg, arg.iov[0].iov_len); | |
1da177e4 | 754 | |
63231bdd PE |
755 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
756 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
658ddaaf SL |
757 | |
758 | #ifdef CONFIG_TCP_MD5SIG | |
759 | release_sk1: | |
760 | if (sk1) { | |
761 | rcu_read_unlock(); | |
762 | sock_put(sk1); | |
763 | } | |
764 | #endif | |
1da177e4 LT |
765 | } |
766 | ||
767 | /* The code following below sending ACKs in SYN-RECV and TIME-WAIT states | |
768 | outside socket context is ugly, certainly. What can I do? | |
769 | */ | |
1cac41cb MB |
770 | #ifdef CONFIG_MPTCP |
771 | static void tcp_v4_send_ack(const struct sock *sk, | |
772 | struct sk_buff *skb, u32 seq, u32 ack, u32 data_ack, | |
773 | u32 win, u32 tsval, u32 tsecr, int oif, | |
774 | struct tcp_md5sig_key *key, | |
775 | int reply_flags, u8 tos, int mptcp) | |
776 | #else | |
344afd62 LC |
777 | static void tcp_v4_send_ack(const struct sock *sk, struct sk_buff *skb, |
778 | u32 seq, u32 ack, | |
ee684b6f | 779 | u32 win, u32 tsval, u32 tsecr, int oif, |
88ef4a5a | 780 | struct tcp_md5sig_key *key, |
66b13d99 | 781 | int reply_flags, u8 tos) |
1cac41cb | 782 | #endif |
1da177e4 | 783 | { |
cf533ea5 | 784 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
785 | struct { |
786 | struct tcphdr th; | |
714e85be | 787 | __be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2) |
cfb6eeb4 | 788 | #ifdef CONFIG_TCP_MD5SIG |
714e85be | 789 | + (TCPOLEN_MD5SIG_ALIGNED >> 2) |
1cac41cb MB |
790 | #endif |
791 | #ifdef CONFIG_MPTCP | |
792 | + ((MPTCP_SUB_LEN_DSS >> 2) + | |
793 | (MPTCP_SUB_LEN_ACK >> 2)) | |
cfb6eeb4 YH |
794 | #endif |
795 | ]; | |
1da177e4 LT |
796 | } rep; |
797 | struct ip_reply_arg arg; | |
344afd62 | 798 | struct net *net = sock_net(sk); |
1da177e4 LT |
799 | |
800 | memset(&rep.th, 0, sizeof(struct tcphdr)); | |
7174259e | 801 | memset(&arg, 0, sizeof(arg)); |
1da177e4 LT |
802 | |
803 | arg.iov[0].iov_base = (unsigned char *)&rep; | |
804 | arg.iov[0].iov_len = sizeof(rep.th); | |
ee684b6f | 805 | if (tsecr) { |
cfb6eeb4 YH |
806 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
807 | (TCPOPT_TIMESTAMP << 8) | | |
808 | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
809 | rep.opt[1] = htonl(tsval); |
810 | rep.opt[2] = htonl(tsecr); | |
cb48cfe8 | 811 | arg.iov[0].iov_len += TCPOLEN_TSTAMP_ALIGNED; |
1da177e4 LT |
812 | } |
813 | ||
814 | /* Swap the send and the receive. */ | |
815 | rep.th.dest = th->source; | |
816 | rep.th.source = th->dest; | |
817 | rep.th.doff = arg.iov[0].iov_len / 4; | |
818 | rep.th.seq = htonl(seq); | |
819 | rep.th.ack_seq = htonl(ack); | |
820 | rep.th.ack = 1; | |
821 | rep.th.window = htons(win); | |
822 | ||
cfb6eeb4 | 823 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 | 824 | if (key) { |
ee684b6f | 825 | int offset = (tsecr) ? 3 : 0; |
cfb6eeb4 YH |
826 | |
827 | rep.opt[offset++] = htonl((TCPOPT_NOP << 24) | | |
828 | (TCPOPT_NOP << 16) | | |
829 | (TCPOPT_MD5SIG << 8) | | |
830 | TCPOLEN_MD5SIG); | |
831 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; | |
832 | rep.th.doff = arg.iov[0].iov_len/4; | |
833 | ||
49a72dfb | 834 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[offset], |
90b7e112 AL |
835 | key, ip_hdr(skb)->saddr, |
836 | ip_hdr(skb)->daddr, &rep.th); | |
cfb6eeb4 YH |
837 | } |
838 | #endif | |
1cac41cb MB |
839 | #ifdef CONFIG_MPTCP |
840 | if (mptcp) { | |
841 | int offset = (tsecr) ? 3 : 0; | |
842 | /* Construction of 32-bit data_ack */ | |
843 | rep.opt[offset++] = htonl((TCPOPT_MPTCP << 24) | | |
844 | ((MPTCP_SUB_LEN_DSS + MPTCP_SUB_LEN_ACK) << 16) | | |
845 | (0x20 << 8) | | |
846 | (0x01)); | |
847 | rep.opt[offset] = htonl(data_ack); | |
848 | ||
849 | arg.iov[0].iov_len += MPTCP_SUB_LEN_DSS + MPTCP_SUB_LEN_ACK; | |
850 | rep.th.doff = arg.iov[0].iov_len / 4; | |
851 | } | |
852 | #endif /* CONFIG_MPTCP */ | |
88ef4a5a | 853 | arg.flags = reply_flags; |
eddc9ec5 ACM |
854 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
855 | ip_hdr(skb)->saddr, /* XXX */ | |
1da177e4 LT |
856 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
857 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; | |
9501f972 YH |
858 | if (oif) |
859 | arg.bound_dev_if = oif; | |
66b13d99 | 860 | arg.tos = tos; |
344afd62 | 861 | arg.uid = sock_net_uid(net, sk_fullsock(sk) ? sk : NULL); |
bdbbb852 ED |
862 | ip_send_unicast_reply(*this_cpu_ptr(net->ipv4.tcp_sk), |
863 | skb, &TCP_SKB_CB(skb)->header.h4.opt, | |
24a2d43d ED |
864 | ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, |
865 | &arg, arg.iov[0].iov_len); | |
1da177e4 | 866 | |
63231bdd | 867 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
1da177e4 LT |
868 | } |
869 | ||
870 | static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
871 | { | |
8feaf0c0 | 872 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 873 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1cac41cb MB |
874 | #ifdef CONFIG_MPTCP |
875 | u32 data_ack = 0; | |
876 | int mptcp = 0; | |
877 | if (tcptw->mptcp_tw && tcptw->mptcp_tw->meta_tw) { | |
878 | data_ack = (u32)tcptw->mptcp_tw->rcv_nxt; | |
879 | mptcp = 1; | |
880 | } | |
881 | #endif | |
344afd62 | 882 | tcp_v4_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
1cac41cb MB |
883 | #ifdef CONFIG_MPTCP |
884 | data_ack, | |
885 | #endif | |
7174259e | 886 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
ee684b6f | 887 | tcp_time_stamp + tcptw->tw_ts_offset, |
9501f972 YH |
888 | tcptw->tw_ts_recent, |
889 | tw->tw_bound_dev_if, | |
88ef4a5a | 890 | tcp_twsk_md5_key(tcptw), |
66b13d99 ED |
891 | tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0, |
892 | tw->tw_tos | |
1cac41cb MB |
893 | #ifdef CONFIG_MPTCP |
894 | , mptcp | |
895 | #endif | |
9501f972 | 896 | ); |
1da177e4 | 897 | |
8feaf0c0 | 898 | inet_twsk_put(tw); |
1da177e4 LT |
899 | } |
900 | ||
1cac41cb MB |
901 | #ifndef CONFIG_MPTCP |
902 | static | |
903 | #endif | |
904 | void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, | |
7174259e | 905 | struct request_sock *req) |
1da177e4 | 906 | { |
1cac41cb | 907 | /* sk->sk_state == TCP_LISTEN or meta-sk -> for regular TCP_SYN_RECV |
168a8f58 JC |
908 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. |
909 | */ | |
1cac41cb MB |
910 | #ifdef CONFIG_MPTCP |
911 | u32 seq = (sk->sk_state == TCP_LISTEN || is_meta_sk(sk)) ? | |
912 | tcp_rsk(req)->snt_isn + 1 : | |
913 | tcp_sk(sk)->snd_nxt; | |
914 | #else | |
915 | u32 seq = (sk->sk_state == TCP_LISTEN) ? | |
916 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt; | |
917 | #endif | |
918 | ||
919 | tcp_v4_send_ack(sk, skb, seq, | |
920 | tcp_rsk(req)->rcv_nxt, | |
921 | #ifdef CONFIG_MPTCP | |
922 | 0, | |
923 | #endif | |
924 | req->rsk_rcv_wnd, | |
ee684b6f | 925 | tcp_time_stamp, |
9501f972 YH |
926 | req->ts_recent, |
927 | 0, | |
6925223a | 928 | tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&ip_hdr(skb)->saddr, |
a915da9b | 929 | AF_INET), |
66b13d99 | 930 | inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0, |
1cac41cb MB |
931 | ip_hdr(skb)->tos |
932 | #ifdef CONFIG_MPTCP | |
933 | , 0 | |
934 | #endif | |
935 | ); | |
1da177e4 LT |
936 | } |
937 | ||
1da177e4 | 938 | /* |
9bf1d83e | 939 | * Send a SYN-ACK after having received a SYN. |
60236fdd | 940 | * This still operates on a request_sock only, not on a big |
1da177e4 LT |
941 | * socket. |
942 | */ | |
1cac41cb MB |
943 | #ifndef CONFIG_MPTCP |
944 | static | |
945 | #endif | |
946 | int tcp_v4_send_synack(const struct sock *sk, struct dst_entry *dst, | |
d6274bd8 | 947 | struct flowi *fl, |
72659ecc | 948 | struct request_sock *req, |
ca6fb065 ED |
949 | struct tcp_fastopen_cookie *foc, |
950 | bool attach_req) | |
1da177e4 | 951 | { |
2e6599cb | 952 | const struct inet_request_sock *ireq = inet_rsk(req); |
6bd023f3 | 953 | struct flowi4 fl4; |
1da177e4 | 954 | int err = -1; |
d41db5af | 955 | struct sk_buff *skb; |
1da177e4 LT |
956 | |
957 | /* First, grab a route. */ | |
ba3f7f04 | 958 | if (!dst && (dst = inet_csk_route_req(sk, &fl4, req)) == NULL) |
fd80eb94 | 959 | return -1; |
1da177e4 | 960 | |
ca6fb065 | 961 | skb = tcp_make_synack(sk, dst, req, foc, attach_req); |
1da177e4 LT |
962 | |
963 | if (skb) { | |
634fb979 | 964 | __tcp_v4_send_check(skb, ireq->ir_loc_addr, ireq->ir_rmt_addr); |
1da177e4 | 965 | |
634fb979 ED |
966 | err = ip_build_and_send_pkt(skb, sk, ireq->ir_loc_addr, |
967 | ireq->ir_rmt_addr, | |
11fa3353 | 968 | ireq_opt_deref(ireq)); |
b9df3cb8 | 969 | err = net_xmit_eval(err); |
1da177e4 LT |
970 | } |
971 | ||
1da177e4 LT |
972 | return err; |
973 | } | |
974 | ||
975 | /* | |
60236fdd | 976 | * IPv4 request_sock destructor. |
1da177e4 | 977 | */ |
1cac41cb MB |
978 | #ifndef CONFIG_MPTCP |
979 | static | |
980 | #endif | |
981 | void tcp_v4_reqsk_destructor(struct request_sock *req) | |
1da177e4 | 982 | { |
13eddc67 | 983 | kfree(rcu_dereference_protected(inet_rsk(req)->ireq_opt, 1)); |
1da177e4 LT |
984 | } |
985 | ||
1da177e4 | 986 | |
cfb6eeb4 YH |
987 | #ifdef CONFIG_TCP_MD5SIG |
988 | /* | |
989 | * RFC2385 MD5 checksumming requires a mapping of | |
990 | * IP address->MD5 Key. | |
991 | * We need to maintain these in the sk structure. | |
992 | */ | |
993 | ||
994 | /* Find the Key structure for an address. */ | |
b83e3deb | 995 | struct tcp_md5sig_key *tcp_md5_do_lookup(const struct sock *sk, |
a915da9b ED |
996 | const union tcp_md5_addr *addr, |
997 | int family) | |
cfb6eeb4 | 998 | { |
fd3a154a | 999 | const struct tcp_sock *tp = tcp_sk(sk); |
a915da9b | 1000 | struct tcp_md5sig_key *key; |
a915da9b | 1001 | unsigned int size = sizeof(struct in_addr); |
fd3a154a | 1002 | const struct tcp_md5sig_info *md5sig; |
cfb6eeb4 | 1003 | |
a8afca03 ED |
1004 | /* caller either holds rcu_read_lock() or socket lock */ |
1005 | md5sig = rcu_dereference_check(tp->md5sig_info, | |
b4fb05ea | 1006 | sock_owned_by_user(sk) || |
b83e3deb | 1007 | lockdep_is_held((spinlock_t *)&sk->sk_lock.slock)); |
a8afca03 | 1008 | if (!md5sig) |
cfb6eeb4 | 1009 | return NULL; |
a915da9b ED |
1010 | #if IS_ENABLED(CONFIG_IPV6) |
1011 | if (family == AF_INET6) | |
1012 | size = sizeof(struct in6_addr); | |
1013 | #endif | |
b67bfe0d | 1014 | hlist_for_each_entry_rcu(key, &md5sig->head, node) { |
a915da9b ED |
1015 | if (key->family != family) |
1016 | continue; | |
1017 | if (!memcmp(&key->addr, addr, size)) | |
1018 | return key; | |
cfb6eeb4 YH |
1019 | } |
1020 | return NULL; | |
1021 | } | |
a915da9b | 1022 | EXPORT_SYMBOL(tcp_md5_do_lookup); |
cfb6eeb4 | 1023 | |
b83e3deb | 1024 | struct tcp_md5sig_key *tcp_v4_md5_lookup(const struct sock *sk, |
fd3a154a | 1025 | const struct sock *addr_sk) |
cfb6eeb4 | 1026 | { |
b52e6921 | 1027 | const union tcp_md5_addr *addr; |
a915da9b | 1028 | |
b52e6921 | 1029 | addr = (const union tcp_md5_addr *)&addr_sk->sk_daddr; |
a915da9b | 1030 | return tcp_md5_do_lookup(sk, addr, AF_INET); |
cfb6eeb4 | 1031 | } |
cfb6eeb4 YH |
1032 | EXPORT_SYMBOL(tcp_v4_md5_lookup); |
1033 | ||
cfb6eeb4 | 1034 | /* This can be called on a newly created socket, from other files */ |
a915da9b ED |
1035 | int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr, |
1036 | int family, const u8 *newkey, u8 newkeylen, gfp_t gfp) | |
cfb6eeb4 YH |
1037 | { |
1038 | /* Add Key to the list */ | |
b0a713e9 | 1039 | struct tcp_md5sig_key *key; |
cfb6eeb4 | 1040 | struct tcp_sock *tp = tcp_sk(sk); |
a915da9b | 1041 | struct tcp_md5sig_info *md5sig; |
cfb6eeb4 | 1042 | |
c0353c7b | 1043 | key = tcp_md5_do_lookup(sk, addr, family); |
cfb6eeb4 YH |
1044 | if (key) { |
1045 | /* Pre-existing entry - just update that one. */ | |
a915da9b | 1046 | memcpy(key->key, newkey, newkeylen); |
b0a713e9 | 1047 | key->keylen = newkeylen; |
a915da9b ED |
1048 | return 0; |
1049 | } | |
260fcbeb | 1050 | |
a8afca03 | 1051 | md5sig = rcu_dereference_protected(tp->md5sig_info, |
1b8e6a01 ED |
1052 | sock_owned_by_user(sk) || |
1053 | lockdep_is_held(&sk->sk_lock.slock)); | |
a915da9b ED |
1054 | if (!md5sig) { |
1055 | md5sig = kmalloc(sizeof(*md5sig), gfp); | |
1056 | if (!md5sig) | |
cfb6eeb4 | 1057 | return -ENOMEM; |
cfb6eeb4 | 1058 | |
a915da9b ED |
1059 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
1060 | INIT_HLIST_HEAD(&md5sig->head); | |
a8afca03 | 1061 | rcu_assign_pointer(tp->md5sig_info, md5sig); |
a915da9b | 1062 | } |
cfb6eeb4 | 1063 | |
5f3d9cb2 | 1064 | key = sock_kmalloc(sk, sizeof(*key), gfp); |
a915da9b ED |
1065 | if (!key) |
1066 | return -ENOMEM; | |
71cea17e | 1067 | if (!tcp_alloc_md5sig_pool()) { |
5f3d9cb2 | 1068 | sock_kfree_s(sk, key, sizeof(*key)); |
a915da9b | 1069 | return -ENOMEM; |
cfb6eeb4 | 1070 | } |
a915da9b ED |
1071 | |
1072 | memcpy(key->key, newkey, newkeylen); | |
1073 | key->keylen = newkeylen; | |
1074 | key->family = family; | |
1075 | memcpy(&key->addr, addr, | |
1076 | (family == AF_INET6) ? sizeof(struct in6_addr) : | |
1077 | sizeof(struct in_addr)); | |
1078 | hlist_add_head_rcu(&key->node, &md5sig->head); | |
cfb6eeb4 YH |
1079 | return 0; |
1080 | } | |
a915da9b | 1081 | EXPORT_SYMBOL(tcp_md5_do_add); |
cfb6eeb4 | 1082 | |
a915da9b | 1083 | int tcp_md5_do_del(struct sock *sk, const union tcp_md5_addr *addr, int family) |
cfb6eeb4 | 1084 | { |
a915da9b ED |
1085 | struct tcp_md5sig_key *key; |
1086 | ||
c0353c7b | 1087 | key = tcp_md5_do_lookup(sk, addr, family); |
a915da9b ED |
1088 | if (!key) |
1089 | return -ENOENT; | |
1090 | hlist_del_rcu(&key->node); | |
5f3d9cb2 | 1091 | atomic_sub(sizeof(*key), &sk->sk_omem_alloc); |
a915da9b | 1092 | kfree_rcu(key, rcu); |
a915da9b | 1093 | return 0; |
cfb6eeb4 | 1094 | } |
a915da9b | 1095 | EXPORT_SYMBOL(tcp_md5_do_del); |
cfb6eeb4 | 1096 | |
e0683e70 | 1097 | static void tcp_clear_md5_list(struct sock *sk) |
cfb6eeb4 YH |
1098 | { |
1099 | struct tcp_sock *tp = tcp_sk(sk); | |
a915da9b | 1100 | struct tcp_md5sig_key *key; |
b67bfe0d | 1101 | struct hlist_node *n; |
a8afca03 | 1102 | struct tcp_md5sig_info *md5sig; |
cfb6eeb4 | 1103 | |
a8afca03 ED |
1104 | md5sig = rcu_dereference_protected(tp->md5sig_info, 1); |
1105 | ||
b67bfe0d | 1106 | hlist_for_each_entry_safe(key, n, &md5sig->head, node) { |
a915da9b | 1107 | hlist_del_rcu(&key->node); |
5f3d9cb2 | 1108 | atomic_sub(sizeof(*key), &sk->sk_omem_alloc); |
a915da9b | 1109 | kfree_rcu(key, rcu); |
cfb6eeb4 YH |
1110 | } |
1111 | } | |
1112 | ||
7174259e ACM |
1113 | static int tcp_v4_parse_md5_keys(struct sock *sk, char __user *optval, |
1114 | int optlen) | |
cfb6eeb4 YH |
1115 | { |
1116 | struct tcp_md5sig cmd; | |
1117 | struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
1118 | |
1119 | if (optlen < sizeof(cmd)) | |
1120 | return -EINVAL; | |
1121 | ||
7174259e | 1122 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
cfb6eeb4 YH |
1123 | return -EFAULT; |
1124 | ||
1125 | if (sin->sin_family != AF_INET) | |
1126 | return -EINVAL; | |
1127 | ||
64a124ed | 1128 | if (!cmd.tcpm_keylen) |
a915da9b ED |
1129 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr, |
1130 | AF_INET); | |
cfb6eeb4 YH |
1131 | |
1132 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
1133 | return -EINVAL; | |
1134 | ||
a915da9b ED |
1135 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr, |
1136 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, | |
1137 | GFP_KERNEL); | |
cfb6eeb4 YH |
1138 | } |
1139 | ||
49a72dfb AL |
1140 | static int tcp_v4_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
1141 | __be32 daddr, __be32 saddr, int nbytes) | |
cfb6eeb4 | 1142 | { |
cfb6eeb4 | 1143 | struct tcp4_pseudohdr *bp; |
49a72dfb | 1144 | struct scatterlist sg; |
cfb6eeb4 YH |
1145 | |
1146 | bp = &hp->md5_blk.ip4; | |
cfb6eeb4 YH |
1147 | |
1148 | /* | |
49a72dfb | 1149 | * 1. the TCP pseudo-header (in the order: source IP address, |
cfb6eeb4 YH |
1150 | * destination IP address, zero-padded protocol number, and |
1151 | * segment length) | |
1152 | */ | |
1153 | bp->saddr = saddr; | |
1154 | bp->daddr = daddr; | |
1155 | bp->pad = 0; | |
076fb722 | 1156 | bp->protocol = IPPROTO_TCP; |
49a72dfb | 1157 | bp->len = cpu_to_be16(nbytes); |
c7da57a1 | 1158 | |
49a72dfb AL |
1159 | sg_init_one(&sg, bp, sizeof(*bp)); |
1160 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
1161 | } | |
1162 | ||
a915da9b | 1163 | static int tcp_v4_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, |
318cf7aa | 1164 | __be32 daddr, __be32 saddr, const struct tcphdr *th) |
49a72dfb AL |
1165 | { |
1166 | struct tcp_md5sig_pool *hp; | |
1167 | struct hash_desc *desc; | |
1168 | ||
1169 | hp = tcp_get_md5sig_pool(); | |
1170 | if (!hp) | |
1171 | goto clear_hash_noput; | |
1172 | desc = &hp->md5_desc; | |
1173 | ||
1174 | if (crypto_hash_init(desc)) | |
1175 | goto clear_hash; | |
1176 | if (tcp_v4_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
1177 | goto clear_hash; | |
1178 | if (tcp_md5_hash_header(hp, th)) | |
1179 | goto clear_hash; | |
1180 | if (tcp_md5_hash_key(hp, key)) | |
1181 | goto clear_hash; | |
1182 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 YH |
1183 | goto clear_hash; |
1184 | ||
cfb6eeb4 | 1185 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 1186 | return 0; |
49a72dfb | 1187 | |
cfb6eeb4 YH |
1188 | clear_hash: |
1189 | tcp_put_md5sig_pool(); | |
1190 | clear_hash_noput: | |
1191 | memset(md5_hash, 0, 16); | |
49a72dfb | 1192 | return 1; |
cfb6eeb4 YH |
1193 | } |
1194 | ||
39f8e58e ED |
1195 | int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key, |
1196 | const struct sock *sk, | |
318cf7aa | 1197 | const struct sk_buff *skb) |
cfb6eeb4 | 1198 | { |
49a72dfb AL |
1199 | struct tcp_md5sig_pool *hp; |
1200 | struct hash_desc *desc; | |
318cf7aa | 1201 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
1202 | __be32 saddr, daddr; |
1203 | ||
39f8e58e ED |
1204 | if (sk) { /* valid for establish/request sockets */ |
1205 | saddr = sk->sk_rcv_saddr; | |
1206 | daddr = sk->sk_daddr; | |
cfb6eeb4 | 1207 | } else { |
49a72dfb AL |
1208 | const struct iphdr *iph = ip_hdr(skb); |
1209 | saddr = iph->saddr; | |
1210 | daddr = iph->daddr; | |
cfb6eeb4 | 1211 | } |
49a72dfb AL |
1212 | |
1213 | hp = tcp_get_md5sig_pool(); | |
1214 | if (!hp) | |
1215 | goto clear_hash_noput; | |
1216 | desc = &hp->md5_desc; | |
1217 | ||
1218 | if (crypto_hash_init(desc)) | |
1219 | goto clear_hash; | |
1220 | ||
1221 | if (tcp_v4_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
1222 | goto clear_hash; | |
1223 | if (tcp_md5_hash_header(hp, th)) | |
1224 | goto clear_hash; | |
1225 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
1226 | goto clear_hash; | |
1227 | if (tcp_md5_hash_key(hp, key)) | |
1228 | goto clear_hash; | |
1229 | if (crypto_hash_final(desc, md5_hash)) | |
1230 | goto clear_hash; | |
1231 | ||
1232 | tcp_put_md5sig_pool(); | |
1233 | return 0; | |
1234 | ||
1235 | clear_hash: | |
1236 | tcp_put_md5sig_pool(); | |
1237 | clear_hash_noput: | |
1238 | memset(md5_hash, 0, 16); | |
1239 | return 1; | |
cfb6eeb4 | 1240 | } |
49a72dfb | 1241 | EXPORT_SYMBOL(tcp_v4_md5_hash_skb); |
cfb6eeb4 | 1242 | |
ba8e275a ED |
1243 | #endif |
1244 | ||
ff74e23f | 1245 | /* Called with rcu_read_lock() */ |
ba8e275a | 1246 | static bool tcp_v4_inbound_md5_hash(const struct sock *sk, |
ff74e23f | 1247 | const struct sk_buff *skb) |
cfb6eeb4 | 1248 | { |
ba8e275a | 1249 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
1250 | /* |
1251 | * This gets called for each TCP segment that arrives | |
1252 | * so we want to be efficient. | |
1253 | * We have 3 drop cases: | |
1254 | * o No MD5 hash and one expected. | |
1255 | * o MD5 hash and we're not expecting one. | |
1256 | * o MD5 hash and its wrong. | |
1257 | */ | |
cf533ea5 | 1258 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 1259 | struct tcp_md5sig_key *hash_expected; |
eddc9ec5 | 1260 | const struct iphdr *iph = ip_hdr(skb); |
cf533ea5 | 1261 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 1262 | int genhash; |
cfb6eeb4 YH |
1263 | unsigned char newhash[16]; |
1264 | ||
a915da9b ED |
1265 | hash_expected = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&iph->saddr, |
1266 | AF_INET); | |
7d5d5525 | 1267 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 1268 | |
cfb6eeb4 YH |
1269 | /* We've parsed the options - do we have a hash? */ |
1270 | if (!hash_expected && !hash_location) | |
a2a385d6 | 1271 | return false; |
cfb6eeb4 YH |
1272 | |
1273 | if (hash_expected && !hash_location) { | |
785957d3 | 1274 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
a2a385d6 | 1275 | return true; |
cfb6eeb4 YH |
1276 | } |
1277 | ||
1278 | if (!hash_expected && hash_location) { | |
785957d3 | 1279 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
a2a385d6 | 1280 | return true; |
cfb6eeb4 YH |
1281 | } |
1282 | ||
1283 | /* Okay, so this is hash_expected and hash_location - | |
1284 | * so we need to calculate the checksum. | |
1285 | */ | |
49a72dfb AL |
1286 | genhash = tcp_v4_md5_hash_skb(newhash, |
1287 | hash_expected, | |
39f8e58e | 1288 | NULL, skb); |
cfb6eeb4 YH |
1289 | |
1290 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { | |
e87cc472 JP |
1291 | net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s\n", |
1292 | &iph->saddr, ntohs(th->source), | |
1293 | &iph->daddr, ntohs(th->dest), | |
1294 | genhash ? " tcp_v4_calc_md5_hash failed" | |
1295 | : ""); | |
a2a385d6 | 1296 | return true; |
cfb6eeb4 | 1297 | } |
a2a385d6 | 1298 | return false; |
cfb6eeb4 | 1299 | #endif |
ba8e275a ED |
1300 | return false; |
1301 | } | |
cfb6eeb4 | 1302 | |
1cac41cb MB |
1303 | #ifdef CONFIG_MPTCP |
1304 | static int tcp_v4_init_req(struct request_sock *req, const struct sock *sk_listener, | |
1305 | struct sk_buff *skb, bool want_cookie) | |
1306 | #else | |
b40cf18e ED |
1307 | static void tcp_v4_init_req(struct request_sock *req, |
1308 | const struct sock *sk_listener, | |
16bea70a | 1309 | struct sk_buff *skb) |
1cac41cb | 1310 | #endif |
16bea70a OP |
1311 | { |
1312 | struct inet_request_sock *ireq = inet_rsk(req); | |
1313 | ||
08d2cc3b ED |
1314 | sk_rcv_saddr_set(req_to_sk(req), ip_hdr(skb)->daddr); |
1315 | sk_daddr_set(req_to_sk(req), ip_hdr(skb)->saddr); | |
1316 | ireq->no_srccheck = inet_sk(sk_listener)->transparent; | |
13eddc67 | 1317 | RCU_INIT_POINTER(ireq->ireq_opt, tcp_v4_save_options(skb)); |
1cac41cb MB |
1318 | |
1319 | #ifdef CONFIG_MPTCP | |
1320 | return 0; | |
1321 | #endif | |
16bea70a OP |
1322 | } |
1323 | ||
f964629e ED |
1324 | static struct dst_entry *tcp_v4_route_req(const struct sock *sk, |
1325 | struct flowi *fl, | |
d94e0417 OP |
1326 | const struct request_sock *req, |
1327 | bool *strict) | |
1328 | { | |
1329 | struct dst_entry *dst = inet_csk_route_req(sk, &fl->u.ip4, req); | |
1330 | ||
1331 | if (strict) { | |
1332 | if (fl->u.ip4.daddr == inet_rsk(req)->ir_rmt_addr) | |
1333 | *strict = true; | |
1334 | else | |
1335 | *strict = false; | |
1336 | } | |
1337 | ||
1338 | return dst; | |
1339 | } | |
1340 | ||
72a3effa | 1341 | struct request_sock_ops tcp_request_sock_ops __read_mostly = { |
1da177e4 | 1342 | .family = PF_INET, |
2e6599cb | 1343 | .obj_size = sizeof(struct tcp_request_sock), |
5db92c99 | 1344 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
1345 | .send_ack = tcp_v4_reqsk_send_ack, |
1346 | .destructor = tcp_v4_reqsk_destructor, | |
1da177e4 | 1347 | .send_reset = tcp_v4_send_reset, |
688d1945 | 1348 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
1349 | }; |
1350 | ||
1cac41cb MB |
1351 | #ifndef CONFIG_MPTCP |
1352 | static | |
1353 | #endif | |
1354 | const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = { | |
2aec4a29 | 1355 | .mss_clamp = TCP_MSS_DEFAULT, |
16bea70a | 1356 | #ifdef CONFIG_TCP_MD5SIG |
fd3a154a | 1357 | .req_md5_lookup = tcp_v4_md5_lookup, |
e3afe7b7 | 1358 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
b6332e6c | 1359 | #endif |
16bea70a | 1360 | .init_req = tcp_v4_init_req, |
fb7b37a7 OP |
1361 | #ifdef CONFIG_SYN_COOKIES |
1362 | .cookie_init_seq = cookie_v4_init_sequence, | |
1363 | #endif | |
d94e0417 | 1364 | .route_req = tcp_v4_route_req, |
936b8bdb | 1365 | .init_seq = tcp_v4_init_sequence, |
d6274bd8 | 1366 | .send_synack = tcp_v4_send_synack, |
16bea70a | 1367 | }; |
cfb6eeb4 | 1368 | |
1da177e4 LT |
1369 | int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) |
1370 | { | |
1da177e4 | 1371 | /* Never answer to SYNs send to broadcast or multicast */ |
511c3f92 | 1372 | if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) |
1da177e4 LT |
1373 | goto drop; |
1374 | ||
1fb6f159 OP |
1375 | return tcp_conn_request(&tcp_request_sock_ops, |
1376 | &tcp_request_sock_ipv4_ops, sk, skb); | |
1da177e4 | 1377 | |
1da177e4 | 1378 | drop: |
848bf15f | 1379 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1380 | return 0; |
1381 | } | |
4bc2f18b | 1382 | EXPORT_SYMBOL(tcp_v4_conn_request); |
1da177e4 LT |
1383 | |
1384 | ||
1385 | /* | |
1386 | * The three way handshake has completed - we got a valid synack - | |
1387 | * now create the new socket. | |
1388 | */ | |
0c27171e | 1389 | struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, |
60236fdd | 1390 | struct request_sock *req, |
5e0724d0 ED |
1391 | struct dst_entry *dst, |
1392 | struct request_sock *req_unhash, | |
1393 | bool *own_req) | |
1da177e4 | 1394 | { |
2e6599cb | 1395 | struct inet_request_sock *ireq; |
1da177e4 LT |
1396 | struct inet_sock *newinet; |
1397 | struct tcp_sock *newtp; | |
1398 | struct sock *newsk; | |
cfb6eeb4 YH |
1399 | #ifdef CONFIG_TCP_MD5SIG |
1400 | struct tcp_md5sig_key *key; | |
1401 | #endif | |
f6d8bd05 | 1402 | struct ip_options_rcu *inet_opt; |
1da177e4 LT |
1403 | |
1404 | if (sk_acceptq_is_full(sk)) | |
1405 | goto exit_overflow; | |
1406 | ||
1da177e4 LT |
1407 | newsk = tcp_create_openreq_child(sk, req, skb); |
1408 | if (!newsk) | |
093d2823 | 1409 | goto exit_nonewsk; |
1da177e4 | 1410 | |
bcd76111 | 1411 | newsk->sk_gso_type = SKB_GSO_TCPV4; |
fae6ef87 | 1412 | inet_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1413 | |
1414 | newtp = tcp_sk(newsk); | |
1415 | newinet = inet_sk(newsk); | |
2e6599cb | 1416 | ireq = inet_rsk(req); |
d1e559d0 ED |
1417 | sk_daddr_set(newsk, ireq->ir_rmt_addr); |
1418 | sk_rcv_saddr_set(newsk, ireq->ir_loc_addr); | |
13eddc67 ED |
1419 | newinet->inet_saddr = ireq->ir_loc_addr; |
1420 | inet_opt = rcu_dereference(ireq->ireq_opt); | |
1421 | RCU_INIT_POINTER(newinet->inet_opt, inet_opt); | |
463c84b9 | 1422 | newinet->mc_index = inet_iif(skb); |
eddc9ec5 | 1423 | newinet->mc_ttl = ip_hdr(skb)->ttl; |
4c507d28 | 1424 | newinet->rcv_tos = ip_hdr(skb)->tos; |
d83d8461 | 1425 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
f6d8bd05 ED |
1426 | if (inet_opt) |
1427 | inet_csk(newsk)->icsk_ext_hdr_len = inet_opt->opt.optlen; | |
c720c7e8 | 1428 | newinet->inet_id = newtp->write_seq ^ jiffies; |
1da177e4 | 1429 | |
dfd25fff ED |
1430 | if (!dst) { |
1431 | dst = inet_csk_route_child_sock(sk, newsk, req); | |
1432 | if (!dst) | |
1433 | goto put_and_exit; | |
1434 | } else { | |
1435 | /* syncookie case : see end of cookie_v4_check() */ | |
1436 | } | |
0e734419 DM |
1437 | sk_setup_caps(newsk, dst); |
1438 | ||
81164413 DB |
1439 | tcp_ca_openreq_child(newsk, dst); |
1440 | ||
1da177e4 | 1441 | tcp_sync_mss(newsk, dst_mtu(dst)); |
0dbaee3b | 1442 | newtp->advmss = dst_metric_advmss(dst); |
f5fff5dc TQ |
1443 | if (tcp_sk(sk)->rx_opt.user_mss && |
1444 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1445 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1446 | ||
1da177e4 LT |
1447 | tcp_initialize_rcv_mss(newsk); |
1448 | ||
cfb6eeb4 YH |
1449 | #ifdef CONFIG_TCP_MD5SIG |
1450 | /* Copy over the MD5 key from the original socket */ | |
a915da9b ED |
1451 | key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&newinet->inet_daddr, |
1452 | AF_INET); | |
00db4124 | 1453 | if (key) { |
cfb6eeb4 YH |
1454 | /* |
1455 | * We're using one, so create a matching key | |
1456 | * on the newsk structure. If we fail to get | |
1457 | * memory, then we end up not copying the key | |
1458 | * across. Shucks. | |
1459 | */ | |
a915da9b ED |
1460 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newinet->inet_daddr, |
1461 | AF_INET, key->key, key->keylen, GFP_ATOMIC); | |
a465419b | 1462 | sk_nocaps_add(newsk, NETIF_F_GSO_MASK); |
cfb6eeb4 YH |
1463 | } |
1464 | #endif | |
1465 | ||
0e734419 DM |
1466 | if (__inet_inherit_port(sk, newsk) < 0) |
1467 | goto put_and_exit; | |
5e0724d0 | 1468 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); |
13eddc67 | 1469 | if (likely(*own_req)) { |
49a496c9 | 1470 | tcp_move_syn(newtp, req); |
13eddc67 ED |
1471 | ireq->ireq_opt = NULL; |
1472 | } else { | |
1473 | newinet->inet_opt = NULL; | |
1474 | } | |
1da177e4 LT |
1475 | return newsk; |
1476 | ||
1477 | exit_overflow: | |
de0744af | 1478 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 BS |
1479 | exit_nonewsk: |
1480 | dst_release(dst); | |
1da177e4 | 1481 | exit: |
de0744af | 1482 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 | 1483 | return NULL; |
0e734419 | 1484 | put_and_exit: |
13eddc67 | 1485 | newinet->inet_opt = NULL; |
e337e24d CP |
1486 | inet_csk_prepare_forced_close(newsk); |
1487 | tcp_done(newsk); | |
0e734419 | 1488 | goto exit; |
1da177e4 | 1489 | } |
4bc2f18b | 1490 | EXPORT_SYMBOL(tcp_v4_syn_recv_sock); |
1da177e4 | 1491 | |
1cac41cb MB |
1492 | #ifndef CONFIG_MPTCP |
1493 | static | |
1494 | #endif | |
1495 | struct sock *tcp_v4_cookie_check(struct sock *sk, struct sk_buff *skb) | |
1da177e4 | 1496 | { |
079096f1 | 1497 | #ifdef CONFIG_SYN_COOKIES |
52452c54 | 1498 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 1499 | |
af9b4738 | 1500 | if (!th->syn) |
461b74c3 | 1501 | sk = cookie_v4_check(sk, skb); |
1da177e4 LT |
1502 | #endif |
1503 | return sk; | |
1504 | } | |
1505 | ||
1da177e4 | 1506 | /* The socket must have it's spinlock held when we get |
e994b2f0 | 1507 | * here, unless it is a TCP_LISTEN socket. |
1da177e4 LT |
1508 | * |
1509 | * We have a potential double-lock case here, so even when | |
1510 | * doing backlog processing we use the BH locking scheme. | |
1511 | * This is because we cannot sleep with the original spinlock | |
1512 | * held. | |
1513 | */ | |
1514 | int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1515 | { | |
cfb6eeb4 | 1516 | struct sock *rsk; |
1cac41cb MB |
1517 | #ifdef CONFIG_MPTCP |
1518 | if (is_meta_sk(sk)) | |
1519 | return mptcp_v4_do_rcv(sk, skb); | |
1520 | #endif | |
cfb6eeb4 | 1521 | |
1da177e4 | 1522 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
404e0a8b ED |
1523 | struct dst_entry *dst = sk->sk_rx_dst; |
1524 | ||
bdeab991 | 1525 | sock_rps_save_rxhash(sk, skb); |
3d97379a | 1526 | sk_mark_napi_id(sk, skb); |
404e0a8b | 1527 | if (dst) { |
505fbcf0 | 1528 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || |
51456b29 | 1529 | !dst->ops->check(dst, 0)) { |
92101b3b DM |
1530 | dst_release(dst); |
1531 | sk->sk_rx_dst = NULL; | |
1532 | } | |
1533 | } | |
c995ae22 | 1534 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
1da177e4 LT |
1535 | return 0; |
1536 | } | |
1537 | ||
12e25e10 | 1538 | if (tcp_checksum_complete(skb)) |
1da177e4 LT |
1539 | goto csum_err; |
1540 | ||
1541 | if (sk->sk_state == TCP_LISTEN) { | |
079096f1 ED |
1542 | struct sock *nsk = tcp_v4_cookie_check(sk, skb); |
1543 | ||
1da177e4 LT |
1544 | if (!nsk) |
1545 | goto discard; | |
1da177e4 | 1546 | if (nsk != sk) { |
bdeab991 | 1547 | sock_rps_save_rxhash(nsk, skb); |
38cb5245 | 1548 | sk_mark_napi_id(nsk, skb); |
cfb6eeb4 YH |
1549 | if (tcp_child_process(sk, nsk, skb)) { |
1550 | rsk = nsk; | |
1da177e4 | 1551 | goto reset; |
cfb6eeb4 | 1552 | } |
1da177e4 LT |
1553 | return 0; |
1554 | } | |
ca55158c | 1555 | } else |
bdeab991 | 1556 | sock_rps_save_rxhash(sk, skb); |
ca55158c | 1557 | |
72ab4a86 | 1558 | if (tcp_rcv_state_process(sk, skb)) { |
cfb6eeb4 | 1559 | rsk = sk; |
1da177e4 | 1560 | goto reset; |
cfb6eeb4 | 1561 | } |
1da177e4 LT |
1562 | return 0; |
1563 | ||
1564 | reset: | |
cfb6eeb4 | 1565 | tcp_v4_send_reset(rsk, skb); |
1da177e4 LT |
1566 | discard: |
1567 | kfree_skb(skb); | |
1568 | /* Be careful here. If this function gets more complicated and | |
1569 | * gcc suffers from register pressure on the x86, sk (in %ebx) | |
1570 | * might be destroyed here. This current version compiles correctly, | |
1571 | * but you have been warned. | |
1572 | */ | |
1573 | return 0; | |
1574 | ||
1575 | csum_err: | |
6a5dc9e5 | 1576 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); |
63231bdd | 1577 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1578 | goto discard; |
1579 | } | |
4bc2f18b | 1580 | EXPORT_SYMBOL(tcp_v4_do_rcv); |
1da177e4 | 1581 | |
160eb5a6 | 1582 | void tcp_v4_early_demux(struct sk_buff *skb) |
41063e9d | 1583 | { |
41063e9d DM |
1584 | const struct iphdr *iph; |
1585 | const struct tcphdr *th; | |
1586 | struct sock *sk; | |
41063e9d | 1587 | |
41063e9d | 1588 | if (skb->pkt_type != PACKET_HOST) |
160eb5a6 | 1589 | return; |
41063e9d | 1590 | |
45f00f99 | 1591 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) |
160eb5a6 | 1592 | return; |
41063e9d DM |
1593 | |
1594 | iph = ip_hdr(skb); | |
45f00f99 | 1595 | th = tcp_hdr(skb); |
41063e9d DM |
1596 | |
1597 | if (th->doff < sizeof(struct tcphdr) / 4) | |
160eb5a6 | 1598 | return; |
41063e9d | 1599 | |
45f00f99 | 1600 | sk = __inet_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
41063e9d | 1601 | iph->saddr, th->source, |
7011d085 | 1602 | iph->daddr, ntohs(th->dest), |
9cb429d6 | 1603 | skb->skb_iif); |
41063e9d DM |
1604 | if (sk) { |
1605 | skb->sk = sk; | |
1606 | skb->destructor = sock_edemux; | |
f7e4eb03 | 1607 | if (sk_fullsock(sk)) { |
d0c294c5 | 1608 | struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst); |
505fbcf0 | 1609 | |
41063e9d DM |
1610 | if (dst) |
1611 | dst = dst_check(dst, 0); | |
92101b3b | 1612 | if (dst && |
505fbcf0 | 1613 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
92101b3b | 1614 | skb_dst_set_noref(skb, dst); |
41063e9d DM |
1615 | } |
1616 | } | |
41063e9d DM |
1617 | } |
1618 | ||
b2fb4f54 ED |
1619 | /* Packet is added to VJ-style prequeue for processing in process |
1620 | * context, if a reader task is waiting. Apparently, this exciting | |
1621 | * idea (VJ's mail "Re: query about TCP header on tcp-ip" of 07 Sep 93) | |
1622 | * failed somewhere. Latency? Burstiness? Well, at least now we will | |
1623 | * see, why it failed. 8)8) --ANK | |
1624 | * | |
1625 | */ | |
1626 | bool tcp_prequeue(struct sock *sk, struct sk_buff *skb) | |
1627 | { | |
1628 | struct tcp_sock *tp = tcp_sk(sk); | |
1629 | ||
1630 | if (sysctl_tcp_low_latency || !tp->ucopy.task) | |
1631 | return false; | |
1632 | ||
1633 | if (skb->len <= tcp_hdrlen(skb) && | |
1634 | skb_queue_len(&tp->ucopy.prequeue) == 0) | |
1635 | return false; | |
1636 | ||
ca777eff ED |
1637 | /* Before escaping RCU protected region, we need to take care of skb |
1638 | * dst. Prequeue is only enabled for established sockets. | |
1639 | * For such sockets, we might need the skb dst only to set sk->sk_rx_dst | |
1640 | * Instead of doing full sk_rx_dst validity here, let's perform | |
1641 | * an optimistic check. | |
1642 | */ | |
1643 | if (likely(sk->sk_rx_dst)) | |
1644 | skb_dst_drop(skb); | |
1645 | else | |
5037e9ef | 1646 | skb_dst_force_safe(skb); |
ca777eff | 1647 | |
b2fb4f54 ED |
1648 | __skb_queue_tail(&tp->ucopy.prequeue, skb); |
1649 | tp->ucopy.memory += skb->truesize; | |
1650 | if (tp->ucopy.memory > sk->sk_rcvbuf) { | |
1651 | struct sk_buff *skb1; | |
1652 | ||
1653 | BUG_ON(sock_owned_by_user(sk)); | |
1654 | ||
1655 | while ((skb1 = __skb_dequeue(&tp->ucopy.prequeue)) != NULL) { | |
1656 | sk_backlog_rcv(sk, skb1); | |
1657 | NET_INC_STATS_BH(sock_net(sk), | |
1658 | LINUX_MIB_TCPPREQUEUEDROPPED); | |
1659 | } | |
1660 | ||
1661 | tp->ucopy.memory = 0; | |
1662 | } else if (skb_queue_len(&tp->ucopy.prequeue) == 1) { | |
1663 | wake_up_interruptible_sync_poll(sk_sleep(sk), | |
1664 | POLLIN | POLLRDNORM | POLLRDBAND); | |
1cac41cb MB |
1665 | if (!inet_csk_ack_scheduled(sk) |
1666 | #ifdef CONFIG_MPTCP | |
1667 | && !mptcp(tp) | |
1668 | #endif | |
1669 | ) | |
b2fb4f54 ED |
1670 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, |
1671 | (3 * tcp_rto_min(sk)) / 4, | |
1672 | TCP_RTO_MAX); | |
1673 | } | |
1674 | return true; | |
1675 | } | |
1676 | EXPORT_SYMBOL(tcp_prequeue); | |
1677 | ||
225a24ae ED |
1678 | int tcp_filter(struct sock *sk, struct sk_buff *skb) |
1679 | { | |
1680 | struct tcphdr *th = (struct tcphdr *)skb->data; | |
1681 | unsigned int eaten = skb->len; | |
1682 | int err; | |
1683 | ||
1684 | err = sk_filter_trim_cap(sk, skb, th->doff * 4); | |
1685 | if (!err) { | |
1686 | eaten -= skb->len; | |
1687 | TCP_SKB_CB(skb)->end_seq -= eaten; | |
1688 | } | |
1689 | return err; | |
1690 | } | |
1691 | EXPORT_SYMBOL(tcp_filter); | |
1692 | ||
1da177e4 LT |
1693 | /* |
1694 | * From tcp_input.c | |
1695 | */ | |
1696 | ||
1cac41cb | 1697 | #define RC_RETRY_CNT 3 |
1da177e4 LT |
1698 | int tcp_v4_rcv(struct sk_buff *skb) |
1699 | { | |
eddc9ec5 | 1700 | const struct iphdr *iph; |
cf533ea5 | 1701 | const struct tcphdr *th; |
1da177e4 | 1702 | struct sock *sk; |
1cac41cb MB |
1703 | #ifdef CONFIG_MPTCP |
1704 | struct sock *meta_sk = NULL; | |
1705 | #endif | |
1da177e4 | 1706 | int ret; |
a86b1e30 | 1707 | struct net *net = dev_net(skb->dev); |
1cac41cb | 1708 | unsigned int retry_cnt = RC_RETRY_CNT; |
1da177e4 LT |
1709 | |
1710 | if (skb->pkt_type != PACKET_HOST) | |
1711 | goto discard_it; | |
1712 | ||
1713 | /* Count it even if it's bad */ | |
63231bdd | 1714 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1715 | |
1716 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1717 | goto discard_it; | |
1718 | ||
aa8223c7 | 1719 | th = tcp_hdr(skb); |
1da177e4 LT |
1720 | |
1721 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1722 | goto bad_packet; | |
1723 | if (!pskb_may_pull(skb, th->doff * 4)) | |
1724 | goto discard_it; | |
1725 | ||
1726 | /* An explanation is required here, I think. | |
1727 | * Packet length and doff are validated by header prediction, | |
caa20d9a | 1728 | * provided case of th->doff==0 is eliminated. |
1da177e4 | 1729 | * So, we defer the checks. */ |
ed70fcfc TH |
1730 | |
1731 | if (skb_checksum_init(skb, IPPROTO_TCP, inet_compute_pseudo)) | |
6a5dc9e5 | 1732 | goto csum_error; |
1da177e4 | 1733 | |
aa8223c7 | 1734 | th = tcp_hdr(skb); |
eddc9ec5 | 1735 | iph = ip_hdr(skb); |
971f10ec ED |
1736 | /* This is tricky : We move IPCB at its correct location into TCP_SKB_CB() |
1737 | * barrier() makes sure compiler wont play fool^Waliasing games. | |
1738 | */ | |
1739 | memmove(&TCP_SKB_CB(skb)->header.h4, IPCB(skb), | |
1740 | sizeof(struct inet_skb_parm)); | |
1741 | barrier(); | |
1742 | ||
1da177e4 LT |
1743 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1744 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1745 | skb->len - th->doff * 4); | |
1746 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1cac41cb MB |
1747 | #ifdef CONFIG_MPTCP |
1748 | TCP_SKB_CB(skb)->mptcp_flags = 0; | |
1749 | TCP_SKB_CB(skb)->dss_off = 0; | |
1750 | #endif | |
e11ecddf | 1751 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); |
04317daf | 1752 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; |
b82d1bb4 | 1753 | TCP_SKB_CB(skb)->ip_dsfield = ipv4_get_dsfield(iph); |
1da177e4 LT |
1754 | TCP_SKB_CB(skb)->sacked = 0; |
1755 | ||
4bdc3d66 | 1756 | lookup: |
9a1f27c4 | 1757 | sk = __inet_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1cac41cb | 1758 | #ifndef CONFIG_MPTCP |
1da177e4 LT |
1759 | if (!sk) |
1760 | goto no_tcp_socket; | |
1cac41cb | 1761 | #endif |
1da177e4 | 1762 | |
bb134d5d | 1763 | process: |
1cac41cb MB |
1764 | #ifdef CONFIG_MPTCP |
1765 | if (sk && sk->sk_state == TCP_TIME_WAIT) | |
1766 | #else | |
bb134d5d | 1767 | if (sk->sk_state == TCP_TIME_WAIT) |
1cac41cb | 1768 | #endif |
bb134d5d ED |
1769 | goto do_time_wait; |
1770 | ||
1cac41cb MB |
1771 | #ifdef CONFIG_MPTCP |
1772 | if (!sk) | |
1773 | goto no_tcp_socket; | |
1774 | #endif | |
1775 | /* | |
1776 | * FIXME: SEC patch for P171206-06874 | |
1777 | * If ACK packets for three-way handshake are received at the same time by multi core, | |
1778 | * each core will try to access request socket and create new socket to establish TCP connection. | |
1779 | * But, there is no synchronization scheme to avoid race condition for request socket, | |
1780 | * 2nd attempt that create new socket will be fail, it caused 2nd ACK packet discard. | |
1781 | * | |
1782 | * For that reason, | |
1783 | * If 2nd ACK packet contained meaningful data, it caused unintended packet drop. | |
1784 | * so, 2nd core should wait at this point until new socket was created by 1st core. | |
1785 | * */ | |
1786 | if (sk->sk_state == TCP_NEW_SYN_RECV) { | |
1787 | struct request_sock *req = inet_reqsk(sk); | |
1788 | if (atomic_read(&req->rsk_refcnt) > (2+1) && retry_cnt > 0) { | |
1789 | reqsk_put(req); | |
1790 | if (retry_cnt == RC_RETRY_CNT) | |
1791 | NET_INC_STATS_BH(net, LINUX_MIB_TCPRACECNDREQSK); | |
1792 | retry_cnt--; | |
1793 | udelay(500); | |
1794 | ||
1795 | goto lookup; | |
1796 | } | |
1797 | ||
1798 | if (!retry_cnt) | |
1799 | NET_INC_STATS_BH(net, LINUX_MIB_TCPRACECNDREQSKDROP); | |
1800 | } | |
1801 | ||
079096f1 ED |
1802 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
1803 | struct request_sock *req = inet_reqsk(sk); | |
9653359e | 1804 | struct sock *nsk; |
079096f1 ED |
1805 | |
1806 | sk = req->rsk_listener; | |
a4b84d5e ED |
1807 | if (unlikely(tcp_v4_inbound_md5_hash(sk, skb))) { |
1808 | reqsk_put(req); | |
1809 | goto discard_it; | |
1810 | } | |
1cac41cb MB |
1811 | if (unlikely(sk->sk_state != TCP_LISTEN |
1812 | #ifdef CONFIG_MPTCP | |
1813 | && !is_meta_sk(sk) | |
1814 | #endif | |
1815 | )) { | |
f03f2e15 | 1816 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
4bdc3d66 ED |
1817 | goto lookup; |
1818 | } | |
9653359e | 1819 | sock_hold(sk); |
1cac41cb MB |
1820 | |
1821 | #ifdef CONFIG_MPTCP | |
1822 | if (is_meta_sk(sk)) { | |
1823 | bh_lock_sock(sk); | |
1824 | ||
1825 | if (sock_owned_by_user(sk)) { | |
1826 | skb->sk = sk; | |
1827 | if (unlikely(sk_add_backlog(sk, skb, | |
1828 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
1829 | bh_unlock_sock(sk); | |
1830 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); | |
1831 | ||
1832 | reqsk_put(req); | |
1833 | goto discard_and_relse; | |
1834 | } | |
1835 | ||
1836 | reqsk_put(req); | |
1837 | bh_unlock_sock(sk); | |
1838 | sock_put(sk); | |
1839 | ||
1840 | return 0; | |
1841 | } | |
1842 | } | |
1843 | #endif | |
9653359e | 1844 | nsk = tcp_check_req(sk, skb, req, false); |
079096f1 ED |
1845 | if (!nsk) { |
1846 | reqsk_put(req); | |
1cac41cb MB |
1847 | #ifdef CONFIG_MPTCP |
1848 | if (is_meta_sk(sk)) | |
1849 | bh_unlock_sock(sk); | |
1850 | #endif | |
9653359e | 1851 | goto discard_and_relse; |
079096f1 ED |
1852 | } |
1853 | if (nsk == sk) { | |
079096f1 | 1854 | reqsk_put(req); |
1cac41cb MB |
1855 | #ifdef CONFIG_MPTCP |
1856 | if (is_meta_sk(sk)) | |
1857 | bh_unlock_sock(sk); | |
1858 | #endif | |
079096f1 ED |
1859 | } else if (tcp_child_process(sk, nsk, skb)) { |
1860 | tcp_v4_send_reset(nsk, skb); | |
9653359e | 1861 | goto discard_and_relse; |
079096f1 | 1862 | } else { |
9653359e | 1863 | sock_put(sk); |
079096f1 ED |
1864 | return 0; |
1865 | } | |
1866 | } | |
6cce09f8 ED |
1867 | if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { |
1868 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
d218d111 | 1869 | goto discard_and_relse; |
6cce09f8 | 1870 | } |
d218d111 | 1871 | |
1da177e4 LT |
1872 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
1873 | goto discard_and_relse; | |
9ea88a15 | 1874 | |
9ea88a15 DP |
1875 | if (tcp_v4_inbound_md5_hash(sk, skb)) |
1876 | goto discard_and_relse; | |
9ea88a15 | 1877 | |
b59c2701 | 1878 | nf_reset(skb); |
1da177e4 | 1879 | |
225a24ae | 1880 | if (tcp_filter(sk, skb)) |
1da177e4 | 1881 | goto discard_and_relse; |
225a24ae ED |
1882 | th = (const struct tcphdr *)skb->data; |
1883 | iph = ip_hdr(skb); | |
1da177e4 LT |
1884 | |
1885 | skb->dev = NULL; | |
1886 | ||
e994b2f0 ED |
1887 | if (sk->sk_state == TCP_LISTEN) { |
1888 | ret = tcp_v4_do_rcv(sk, skb); | |
1889 | goto put_and_return; | |
1890 | } | |
1891 | ||
1892 | sk_incoming_cpu_update(sk); | |
1893 | ||
1cac41cb MB |
1894 | #ifdef CONFIG_MPTCP |
1895 | if (mptcp(tcp_sk(sk))) { | |
1896 | meta_sk = mptcp_meta_sk(sk); | |
1897 | ||
1898 | bh_lock_sock_nested(meta_sk); | |
1899 | if (sock_owned_by_user(meta_sk)) | |
1900 | skb->sk = sk; | |
1901 | } else { | |
1902 | meta_sk = sk; | |
1903 | #endif | |
1904 | bh_lock_sock_nested(sk); | |
1905 | #ifdef CONFIG_MPTCP | |
1906 | } | |
1907 | #endif | |
2efd055c | 1908 | tcp_sk(sk)->segs_in += max_t(u16, 1, skb_shinfo(skb)->gso_segs); |
1da177e4 | 1909 | ret = 0; |
1cac41cb MB |
1910 | #ifdef CONFIG_MPTCP |
1911 | if (!sock_owned_by_user(meta_sk)) { | |
1912 | if (!tcp_prequeue(meta_sk, skb)) | |
1913 | ret = tcp_v4_do_rcv(sk, skb); | |
1914 | } else if (unlikely(sk_add_backlog(meta_sk, skb, | |
1915 | meta_sk->sk_rcvbuf + meta_sk->sk_sndbuf))) { | |
1916 | bh_unlock_sock(meta_sk); | |
1917 | #else | |
1da177e4 | 1918 | if (!sock_owned_by_user(sk)) { |
7bced397 | 1919 | if (!tcp_prequeue(sk, skb)) |
1da177e4 | 1920 | ret = tcp_v4_do_rcv(sk, skb); |
da882c1f ED |
1921 | } else if (unlikely(sk_add_backlog(sk, skb, |
1922 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1923 | bh_unlock_sock(sk); |
1cac41cb | 1924 | #endif |
6cce09f8 | 1925 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1926 | goto discard_and_relse; |
1927 | } | |
1cac41cb MB |
1928 | #ifdef CONFIG_MPTCP |
1929 | bh_unlock_sock(meta_sk); | |
1930 | #else | |
1da177e4 | 1931 | bh_unlock_sock(sk); |
1cac41cb | 1932 | #endif |
1da177e4 | 1933 | |
e994b2f0 | 1934 | put_and_return: |
1da177e4 LT |
1935 | sock_put(sk); |
1936 | ||
1937 | return ret; | |
1938 | ||
1939 | no_tcp_socket: | |
1940 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1941 | goto discard_it; | |
1942 | ||
1cac41cb MB |
1943 | #ifdef CONFIG_MPTCP |
1944 | if (!sk && th->syn && !th->ack) { | |
1945 | int ret = mptcp_lookup_join(skb, NULL); | |
1946 | ||
1947 | if (ret < 0) { | |
1948 | tcp_v4_send_reset(NULL, skb); | |
1949 | goto discard_it; | |
1950 | } else if (ret > 0) { | |
1951 | return 0; | |
1952 | } | |
1953 | } | |
1954 | #endif | |
1955 | ||
12e25e10 | 1956 | if (tcp_checksum_complete(skb)) { |
6a5dc9e5 ED |
1957 | csum_error: |
1958 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); | |
1da177e4 | 1959 | bad_packet: |
63231bdd | 1960 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1961 | } else { |
cfb6eeb4 | 1962 | tcp_v4_send_reset(NULL, skb); |
1da177e4 LT |
1963 | } |
1964 | ||
1965 | discard_it: | |
1966 | /* Discard frame. */ | |
1967 | kfree_skb(skb); | |
e905a9ed | 1968 | return 0; |
1da177e4 LT |
1969 | |
1970 | discard_and_relse: | |
1971 | sock_put(sk); | |
1972 | goto discard_it; | |
1973 | ||
1974 | do_time_wait: | |
1975 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1976 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1977 | goto discard_it; |
1978 | } | |
1979 | ||
6a5dc9e5 ED |
1980 | if (tcp_checksum_complete(skb)) { |
1981 | inet_twsk_put(inet_twsk(sk)); | |
1982 | goto csum_error; | |
1da177e4 | 1983 | } |
9469c7b4 | 1984 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 | 1985 | case TCP_TW_SYN: { |
c346dca1 | 1986 | struct sock *sk2 = inet_lookup_listener(dev_net(skb->dev), |
c67499c0 | 1987 | &tcp_hashinfo, |
da5e3630 | 1988 | iph->saddr, th->source, |
eddc9ec5 | 1989 | iph->daddr, th->dest, |
463c84b9 | 1990 | inet_iif(skb)); |
1da177e4 | 1991 | if (sk2) { |
dbe7faa4 | 1992 | inet_twsk_deschedule_put(inet_twsk(sk)); |
1da177e4 LT |
1993 | sk = sk2; |
1994 | goto process; | |
1995 | } | |
1cac41cb MB |
1996 | #ifdef CONFIG_MPTCP |
1997 | if (th->syn && !th->ack) { | |
1998 | int ret = mptcp_lookup_join(skb, inet_twsk(sk)); | |
1999 | ||
2000 | if (ret < 0) { | |
2001 | tcp_v4_send_reset(NULL, skb); | |
2002 | goto discard_it; | |
2003 | } else if (ret > 0) { | |
2004 | return 0; | |
2005 | } | |
2006 | } | |
2007 | #endif | |
1da177e4 LT |
2008 | /* Fall through to ACK */ |
2009 | } | |
2010 | case TCP_TW_ACK: | |
2011 | tcp_v4_timewait_ack(sk, skb); | |
2012 | break; | |
2013 | case TCP_TW_RST: | |
2014 | goto no_tcp_socket; | |
2015 | case TCP_TW_SUCCESS:; | |
2016 | } | |
2017 | goto discard_it; | |
2018 | } | |
2019 | ||
ccb7c410 DM |
2020 | static struct timewait_sock_ops tcp_timewait_sock_ops = { |
2021 | .twsk_obj_size = sizeof(struct tcp_timewait_sock), | |
2022 | .twsk_unique = tcp_twsk_unique, | |
2023 | .twsk_destructor= tcp_twsk_destructor, | |
ccb7c410 | 2024 | }; |
1da177e4 | 2025 | |
63d02d15 | 2026 | void inet_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
5d299f3d ED |
2027 | { |
2028 | struct dst_entry *dst = skb_dst(skb); | |
2029 | ||
5037e9ef | 2030 | if (dst && dst_hold_safe(dst)) { |
ca777eff ED |
2031 | sk->sk_rx_dst = dst; |
2032 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
2033 | } | |
5d299f3d | 2034 | } |
63d02d15 | 2035 | EXPORT_SYMBOL(inet_sk_rx_dst_set); |
5d299f3d | 2036 | |
3b401a81 | 2037 | const struct inet_connection_sock_af_ops ipv4_specific = { |
543d9cfe ACM |
2038 | .queue_xmit = ip_queue_xmit, |
2039 | .send_check = tcp_v4_send_check, | |
2040 | .rebuild_header = inet_sk_rebuild_header, | |
5d299f3d | 2041 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
2042 | .conn_request = tcp_v4_conn_request, |
2043 | .syn_recv_sock = tcp_v4_syn_recv_sock, | |
543d9cfe ACM |
2044 | .net_header_len = sizeof(struct iphdr), |
2045 | .setsockopt = ip_setsockopt, | |
2046 | .getsockopt = ip_getsockopt, | |
2047 | .addr2sockaddr = inet_csk_addr2sockaddr, | |
2048 | .sockaddr_len = sizeof(struct sockaddr_in), | |
ab1e0a13 | 2049 | .bind_conflict = inet_csk_bind_conflict, |
3fdadf7d | 2050 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
2051 | .compat_setsockopt = compat_ip_setsockopt, |
2052 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 2053 | #endif |
4fab9071 | 2054 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 | 2055 | }; |
4bc2f18b | 2056 | EXPORT_SYMBOL(ipv4_specific); |
1da177e4 | 2057 | |
cfb6eeb4 | 2058 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 2059 | static const struct tcp_sock_af_ops tcp_sock_ipv4_specific = { |
cfb6eeb4 | 2060 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 2061 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 2062 | .md5_parse = tcp_v4_parse_md5_keys, |
cfb6eeb4 | 2063 | }; |
b6332e6c | 2064 | #endif |
cfb6eeb4 | 2065 | |
1da177e4 LT |
2066 | /* NOTE: A lot of things set to zero explicitly by call to |
2067 | * sk_alloc() so need not be done here. | |
2068 | */ | |
2069 | static int tcp_v4_init_sock(struct sock *sk) | |
2070 | { | |
6687e988 | 2071 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 2072 | |
900f65d3 | 2073 | tcp_init_sock(sk); |
1da177e4 | 2074 | |
1cac41cb MB |
2075 | #ifdef CONFIG_MPTCP |
2076 | if (sock_flag(sk, SOCK_MPTCP)) | |
2077 | icsk->icsk_af_ops = &mptcp_v4_specific; | |
2078 | else | |
2079 | #endif | |
8292a17a | 2080 | icsk->icsk_af_ops = &ipv4_specific; |
900f65d3 | 2081 | |
cfb6eeb4 | 2082 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 2083 | tcp_sk(sk)->af_specific = &tcp_sock_ipv4_specific; |
cfb6eeb4 | 2084 | #endif |
1da177e4 | 2085 | |
1da177e4 LT |
2086 | return 0; |
2087 | } | |
2088 | ||
7d06b2e0 | 2089 | void tcp_v4_destroy_sock(struct sock *sk) |
1da177e4 LT |
2090 | { |
2091 | struct tcp_sock *tp = tcp_sk(sk); | |
2092 | ||
2093 | tcp_clear_xmit_timers(sk); | |
2094 | ||
6687e988 | 2095 | tcp_cleanup_congestion_control(sk); |
1cac41cb MB |
2096 | #ifdef CONFIG_MPTCP |
2097 | if (mptcp(tp)) | |
2098 | mptcp_destroy_sock(sk); | |
2099 | if (tp->inside_tk_table) | |
2100 | mptcp_hash_remove(tp); | |
2101 | #endif | |
317a76f9 | 2102 | |
1da177e4 | 2103 | /* Cleanup up the write buffer. */ |
fe067e8a | 2104 | tcp_write_queue_purge(sk); |
1da177e4 LT |
2105 | |
2106 | /* Cleans up our, hopefully empty, out_of_order_queue. */ | |
e905a9ed | 2107 | __skb_queue_purge(&tp->out_of_order_queue); |
1da177e4 | 2108 | |
cfb6eeb4 YH |
2109 | #ifdef CONFIG_TCP_MD5SIG |
2110 | /* Clean up the MD5 key list, if any */ | |
2111 | if (tp->md5sig_info) { | |
a915da9b | 2112 | tcp_clear_md5_list(sk); |
a8afca03 | 2113 | kfree_rcu(tp->md5sig_info, rcu); |
cfb6eeb4 YH |
2114 | tp->md5sig_info = NULL; |
2115 | } | |
2116 | #endif | |
1a2449a8 | 2117 | |
1da177e4 LT |
2118 | /* Clean prequeue, it must be empty really */ |
2119 | __skb_queue_purge(&tp->ucopy.prequeue); | |
2120 | ||
2121 | /* Clean up a referenced TCP bind bucket. */ | |
463c84b9 | 2122 | if (inet_csk(sk)->icsk_bind_hash) |
ab1e0a13 | 2123 | inet_put_port(sk); |
1da177e4 | 2124 | |
00db4124 | 2125 | BUG_ON(tp->fastopen_rsk); |
435cf559 | 2126 | |
cf60af03 YC |
2127 | /* If socket is aborted during connect operation */ |
2128 | tcp_free_fastopen_req(tp); | |
cd8ae852 | 2129 | tcp_saved_syn_free(tp); |
cf60af03 | 2130 | |
180d8cd9 | 2131 | sk_sockets_allocated_dec(sk); |
d1a4c0b3 | 2132 | sock_release_memcg(sk); |
1da177e4 | 2133 | } |
1da177e4 LT |
2134 | EXPORT_SYMBOL(tcp_v4_destroy_sock); |
2135 | ||
2136 | #ifdef CONFIG_PROC_FS | |
2137 | /* Proc filesystem TCP sock list dumping. */ | |
2138 | ||
a8b690f9 TH |
2139 | /* |
2140 | * Get next listener socket follow cur. If cur is NULL, get first socket | |
2141 | * starting from bucket given in st->bucket; when st->bucket is zero the | |
2142 | * very first socket in the hash table is returned. | |
2143 | */ | |
1da177e4 LT |
2144 | static void *listening_get_next(struct seq_file *seq, void *cur) |
2145 | { | |
463c84b9 | 2146 | struct inet_connection_sock *icsk; |
c25eb3bf | 2147 | struct hlist_nulls_node *node; |
1da177e4 | 2148 | struct sock *sk = cur; |
5caea4ea | 2149 | struct inet_listen_hashbucket *ilb; |
5799de0b | 2150 | struct tcp_iter_state *st = seq->private; |
a4146b1b | 2151 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2152 | |
2153 | if (!sk) { | |
a8b690f9 | 2154 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
5caea4ea | 2155 | spin_lock_bh(&ilb->lock); |
c25eb3bf | 2156 | sk = sk_nulls_head(&ilb->head); |
a8b690f9 | 2157 | st->offset = 0; |
1da177e4 LT |
2158 | goto get_sk; |
2159 | } | |
5caea4ea | 2160 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
1da177e4 | 2161 | ++st->num; |
a8b690f9 | 2162 | ++st->offset; |
1da177e4 | 2163 | |
079096f1 | 2164 | sk = sk_nulls_next(sk); |
1da177e4 | 2165 | get_sk: |
c25eb3bf | 2166 | sk_nulls_for_each_from(sk, node) { |
8475ef9f PE |
2167 | if (!net_eq(sock_net(sk), net)) |
2168 | continue; | |
2169 | if (sk->sk_family == st->family) { | |
1da177e4 LT |
2170 | cur = sk; |
2171 | goto out; | |
2172 | } | |
e905a9ed | 2173 | icsk = inet_csk(sk); |
1da177e4 | 2174 | } |
5caea4ea | 2175 | spin_unlock_bh(&ilb->lock); |
a8b690f9 | 2176 | st->offset = 0; |
0f7ff927 | 2177 | if (++st->bucket < INET_LHTABLE_SIZE) { |
5caea4ea ED |
2178 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
2179 | spin_lock_bh(&ilb->lock); | |
c25eb3bf | 2180 | sk = sk_nulls_head(&ilb->head); |
1da177e4 LT |
2181 | goto get_sk; |
2182 | } | |
2183 | cur = NULL; | |
2184 | out: | |
2185 | return cur; | |
2186 | } | |
2187 | ||
2188 | static void *listening_get_idx(struct seq_file *seq, loff_t *pos) | |
2189 | { | |
a8b690f9 TH |
2190 | struct tcp_iter_state *st = seq->private; |
2191 | void *rc; | |
2192 | ||
2193 | st->bucket = 0; | |
2194 | st->offset = 0; | |
2195 | rc = listening_get_next(seq, NULL); | |
1da177e4 LT |
2196 | |
2197 | while (rc && *pos) { | |
2198 | rc = listening_get_next(seq, rc); | |
2199 | --*pos; | |
2200 | } | |
2201 | return rc; | |
2202 | } | |
2203 | ||
05dbc7b5 | 2204 | static inline bool empty_bucket(const struct tcp_iter_state *st) |
6eac5604 | 2205 | { |
05dbc7b5 | 2206 | return hlist_nulls_empty(&tcp_hashinfo.ehash[st->bucket].chain); |
6eac5604 AK |
2207 | } |
2208 | ||
a8b690f9 TH |
2209 | /* |
2210 | * Get first established socket starting from bucket given in st->bucket. | |
2211 | * If st->bucket is zero, the very first socket in the hash is returned. | |
2212 | */ | |
1da177e4 LT |
2213 | static void *established_get_first(struct seq_file *seq) |
2214 | { | |
5799de0b | 2215 | struct tcp_iter_state *st = seq->private; |
a4146b1b | 2216 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2217 | void *rc = NULL; |
2218 | ||
a8b690f9 TH |
2219 | st->offset = 0; |
2220 | for (; st->bucket <= tcp_hashinfo.ehash_mask; ++st->bucket) { | |
1da177e4 | 2221 | struct sock *sk; |
3ab5aee7 | 2222 | struct hlist_nulls_node *node; |
9db66bdc | 2223 | spinlock_t *lock = inet_ehash_lockp(&tcp_hashinfo, st->bucket); |
1da177e4 | 2224 | |
6eac5604 AK |
2225 | /* Lockless fast path for the common case of empty buckets */ |
2226 | if (empty_bucket(st)) | |
2227 | continue; | |
2228 | ||
9db66bdc | 2229 | spin_lock_bh(lock); |
3ab5aee7 | 2230 | sk_nulls_for_each(sk, node, &tcp_hashinfo.ehash[st->bucket].chain) { |
f40c8174 | 2231 | if (sk->sk_family != st->family || |
878628fb | 2232 | !net_eq(sock_net(sk), net)) { |
1da177e4 LT |
2233 | continue; |
2234 | } | |
2235 | rc = sk; | |
2236 | goto out; | |
2237 | } | |
9db66bdc | 2238 | spin_unlock_bh(lock); |
1da177e4 LT |
2239 | } |
2240 | out: | |
2241 | return rc; | |
2242 | } | |
2243 | ||
2244 | static void *established_get_next(struct seq_file *seq, void *cur) | |
2245 | { | |
2246 | struct sock *sk = cur; | |
3ab5aee7 | 2247 | struct hlist_nulls_node *node; |
5799de0b | 2248 | struct tcp_iter_state *st = seq->private; |
a4146b1b | 2249 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2250 | |
2251 | ++st->num; | |
a8b690f9 | 2252 | ++st->offset; |
1da177e4 | 2253 | |
05dbc7b5 | 2254 | sk = sk_nulls_next(sk); |
1da177e4 | 2255 | |
3ab5aee7 | 2256 | sk_nulls_for_each_from(sk, node) { |
878628fb | 2257 | if (sk->sk_family == st->family && net_eq(sock_net(sk), net)) |
05dbc7b5 | 2258 | return sk; |
1da177e4 LT |
2259 | } |
2260 | ||
05dbc7b5 ED |
2261 | spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
2262 | ++st->bucket; | |
2263 | return established_get_first(seq); | |
1da177e4 LT |
2264 | } |
2265 | ||
2266 | static void *established_get_idx(struct seq_file *seq, loff_t pos) | |
2267 | { | |
a8b690f9 TH |
2268 | struct tcp_iter_state *st = seq->private; |
2269 | void *rc; | |
2270 | ||
2271 | st->bucket = 0; | |
2272 | rc = established_get_first(seq); | |
1da177e4 LT |
2273 | |
2274 | while (rc && pos) { | |
2275 | rc = established_get_next(seq, rc); | |
2276 | --pos; | |
7174259e | 2277 | } |
1da177e4 LT |
2278 | return rc; |
2279 | } | |
2280 | ||
2281 | static void *tcp_get_idx(struct seq_file *seq, loff_t pos) | |
2282 | { | |
2283 | void *rc; | |
5799de0b | 2284 | struct tcp_iter_state *st = seq->private; |
1da177e4 | 2285 | |
1da177e4 LT |
2286 | st->state = TCP_SEQ_STATE_LISTENING; |
2287 | rc = listening_get_idx(seq, &pos); | |
2288 | ||
2289 | if (!rc) { | |
1da177e4 LT |
2290 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
2291 | rc = established_get_idx(seq, pos); | |
2292 | } | |
2293 | ||
2294 | return rc; | |
2295 | } | |
2296 | ||
a8b690f9 TH |
2297 | static void *tcp_seek_last_pos(struct seq_file *seq) |
2298 | { | |
2299 | struct tcp_iter_state *st = seq->private; | |
2300 | int offset = st->offset; | |
2301 | int orig_num = st->num; | |
2302 | void *rc = NULL; | |
2303 | ||
2304 | switch (st->state) { | |
a8b690f9 TH |
2305 | case TCP_SEQ_STATE_LISTENING: |
2306 | if (st->bucket >= INET_LHTABLE_SIZE) | |
2307 | break; | |
2308 | st->state = TCP_SEQ_STATE_LISTENING; | |
2309 | rc = listening_get_next(seq, NULL); | |
2310 | while (offset-- && rc) | |
2311 | rc = listening_get_next(seq, rc); | |
2312 | if (rc) | |
2313 | break; | |
2314 | st->bucket = 0; | |
05dbc7b5 | 2315 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
a8b690f9 TH |
2316 | /* Fallthrough */ |
2317 | case TCP_SEQ_STATE_ESTABLISHED: | |
a8b690f9 TH |
2318 | if (st->bucket > tcp_hashinfo.ehash_mask) |
2319 | break; | |
2320 | rc = established_get_first(seq); | |
2321 | while (offset-- && rc) | |
2322 | rc = established_get_next(seq, rc); | |
2323 | } | |
2324 | ||
2325 | st->num = orig_num; | |
2326 | ||
2327 | return rc; | |
2328 | } | |
2329 | ||
1da177e4 LT |
2330 | static void *tcp_seq_start(struct seq_file *seq, loff_t *pos) |
2331 | { | |
5799de0b | 2332 | struct tcp_iter_state *st = seq->private; |
a8b690f9 TH |
2333 | void *rc; |
2334 | ||
2335 | if (*pos && *pos == st->last_pos) { | |
2336 | rc = tcp_seek_last_pos(seq); | |
2337 | if (rc) | |
2338 | goto out; | |
2339 | } | |
2340 | ||
1da177e4 LT |
2341 | st->state = TCP_SEQ_STATE_LISTENING; |
2342 | st->num = 0; | |
a8b690f9 TH |
2343 | st->bucket = 0; |
2344 | st->offset = 0; | |
2345 | rc = *pos ? tcp_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
2346 | ||
2347 | out: | |
2348 | st->last_pos = *pos; | |
2349 | return rc; | |
1da177e4 LT |
2350 | } |
2351 | ||
2352 | static void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2353 | { | |
a8b690f9 | 2354 | struct tcp_iter_state *st = seq->private; |
1da177e4 | 2355 | void *rc = NULL; |
1da177e4 LT |
2356 | |
2357 | if (v == SEQ_START_TOKEN) { | |
2358 | rc = tcp_get_idx(seq, 0); | |
2359 | goto out; | |
2360 | } | |
1da177e4 LT |
2361 | |
2362 | switch (st->state) { | |
1da177e4 LT |
2363 | case TCP_SEQ_STATE_LISTENING: |
2364 | rc = listening_get_next(seq, v); | |
2365 | if (!rc) { | |
1da177e4 | 2366 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
a8b690f9 TH |
2367 | st->bucket = 0; |
2368 | st->offset = 0; | |
1da177e4 LT |
2369 | rc = established_get_first(seq); |
2370 | } | |
2371 | break; | |
2372 | case TCP_SEQ_STATE_ESTABLISHED: | |
1da177e4 LT |
2373 | rc = established_get_next(seq, v); |
2374 | break; | |
2375 | } | |
2376 | out: | |
2377 | ++*pos; | |
a8b690f9 | 2378 | st->last_pos = *pos; |
1da177e4 LT |
2379 | return rc; |
2380 | } | |
2381 | ||
2382 | static void tcp_seq_stop(struct seq_file *seq, void *v) | |
2383 | { | |
5799de0b | 2384 | struct tcp_iter_state *st = seq->private; |
1da177e4 LT |
2385 | |
2386 | switch (st->state) { | |
1da177e4 LT |
2387 | case TCP_SEQ_STATE_LISTENING: |
2388 | if (v != SEQ_START_TOKEN) | |
5caea4ea | 2389 | spin_unlock_bh(&tcp_hashinfo.listening_hash[st->bucket].lock); |
1da177e4 | 2390 | break; |
1da177e4 LT |
2391 | case TCP_SEQ_STATE_ESTABLISHED: |
2392 | if (v) | |
9db66bdc | 2393 | spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
1da177e4 LT |
2394 | break; |
2395 | } | |
2396 | } | |
2397 | ||
73cb88ec | 2398 | int tcp_seq_open(struct inode *inode, struct file *file) |
1da177e4 | 2399 | { |
d9dda78b | 2400 | struct tcp_seq_afinfo *afinfo = PDE_DATA(inode); |
1da177e4 | 2401 | struct tcp_iter_state *s; |
52d6f3f1 | 2402 | int err; |
1da177e4 | 2403 | |
52d6f3f1 DL |
2404 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
2405 | sizeof(struct tcp_iter_state)); | |
2406 | if (err < 0) | |
2407 | return err; | |
f40c8174 | 2408 | |
52d6f3f1 | 2409 | s = ((struct seq_file *)file->private_data)->private; |
1da177e4 | 2410 | s->family = afinfo->family; |
688d1945 | 2411 | s->last_pos = 0; |
f40c8174 DL |
2412 | return 0; |
2413 | } | |
73cb88ec | 2414 | EXPORT_SYMBOL(tcp_seq_open); |
f40c8174 | 2415 | |
6f8b13bc | 2416 | int tcp_proc_register(struct net *net, struct tcp_seq_afinfo *afinfo) |
1da177e4 LT |
2417 | { |
2418 | int rc = 0; | |
2419 | struct proc_dir_entry *p; | |
2420 | ||
9427c4b3 DL |
2421 | afinfo->seq_ops.start = tcp_seq_start; |
2422 | afinfo->seq_ops.next = tcp_seq_next; | |
2423 | afinfo->seq_ops.stop = tcp_seq_stop; | |
2424 | ||
84841c3c | 2425 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
73cb88ec | 2426 | afinfo->seq_fops, afinfo); |
84841c3c | 2427 | if (!p) |
1da177e4 LT |
2428 | rc = -ENOMEM; |
2429 | return rc; | |
2430 | } | |
4bc2f18b | 2431 | EXPORT_SYMBOL(tcp_proc_register); |
1da177e4 | 2432 | |
6f8b13bc | 2433 | void tcp_proc_unregister(struct net *net, struct tcp_seq_afinfo *afinfo) |
1da177e4 | 2434 | { |
ece31ffd | 2435 | remove_proc_entry(afinfo->name, net->proc_net); |
1da177e4 | 2436 | } |
4bc2f18b | 2437 | EXPORT_SYMBOL(tcp_proc_unregister); |
1da177e4 | 2438 | |
d4f06873 | 2439 | static void get_openreq4(const struct request_sock *req, |
aa3a0c8c | 2440 | struct seq_file *f, int i) |
1da177e4 | 2441 | { |
2e6599cb | 2442 | const struct inet_request_sock *ireq = inet_rsk(req); |
fa76ce73 | 2443 | long delta = req->rsk_timer.expires - jiffies; |
1da177e4 | 2444 | |
5e659e4c | 2445 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
652586df | 2446 | " %02X %08X:%08X %02X:%08lX %08X %5u %8d %u %d %pK", |
1da177e4 | 2447 | i, |
634fb979 | 2448 | ireq->ir_loc_addr, |
d4f06873 | 2449 | ireq->ir_num, |
634fb979 ED |
2450 | ireq->ir_rmt_addr, |
2451 | ntohs(ireq->ir_rmt_port), | |
1da177e4 LT |
2452 | TCP_SYN_RECV, |
2453 | 0, 0, /* could print option size, but that is af dependent. */ | |
2454 | 1, /* timers active (only the expire timer) */ | |
a399a805 | 2455 | jiffies_delta_to_clock_t(delta), |
e6c022a4 | 2456 | req->num_timeout, |
aa3a0c8c ED |
2457 | from_kuid_munged(seq_user_ns(f), |
2458 | sock_i_uid(req->rsk_listener)), | |
1da177e4 LT |
2459 | 0, /* non standard timer */ |
2460 | 0, /* open_requests have no inode */ | |
d4f06873 | 2461 | 0, |
652586df | 2462 | req); |
1da177e4 LT |
2463 | } |
2464 | ||
652586df | 2465 | static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i) |
1da177e4 LT |
2466 | { |
2467 | int timer_active; | |
2468 | unsigned long timer_expires; | |
cf533ea5 | 2469 | const struct tcp_sock *tp = tcp_sk(sk); |
cf4c6bf8 | 2470 | const struct inet_connection_sock *icsk = inet_csk(sk); |
cf533ea5 | 2471 | const struct inet_sock *inet = inet_sk(sk); |
0536fcc0 | 2472 | const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq; |
c720c7e8 ED |
2473 | __be32 dest = inet->inet_daddr; |
2474 | __be32 src = inet->inet_rcv_saddr; | |
2475 | __u16 destp = ntohs(inet->inet_dport); | |
2476 | __u16 srcp = ntohs(inet->inet_sport); | |
49d09007 | 2477 | int rx_queue; |
00fd38d9 | 2478 | int state; |
1da177e4 | 2479 | |
6ba8a3b1 ND |
2480 | if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
2481 | icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS || | |
2482 | icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { | |
1da177e4 | 2483 | timer_active = 1; |
463c84b9 ACM |
2484 | timer_expires = icsk->icsk_timeout; |
2485 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 2486 | timer_active = 4; |
463c84b9 | 2487 | timer_expires = icsk->icsk_timeout; |
cf4c6bf8 | 2488 | } else if (timer_pending(&sk->sk_timer)) { |
1da177e4 | 2489 | timer_active = 2; |
cf4c6bf8 | 2490 | timer_expires = sk->sk_timer.expires; |
1da177e4 LT |
2491 | } else { |
2492 | timer_active = 0; | |
2493 | timer_expires = jiffies; | |
2494 | } | |
2495 | ||
00fd38d9 ED |
2496 | state = sk_state_load(sk); |
2497 | if (state == TCP_LISTEN) | |
49d09007 ED |
2498 | rx_queue = sk->sk_ack_backlog; |
2499 | else | |
00fd38d9 ED |
2500 | /* Because we don't lock the socket, |
2501 | * we might find a transient negative value. | |
49d09007 ED |
2502 | */ |
2503 | rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); | |
2504 | ||
5e659e4c | 2505 | seq_printf(f, "%4d: %08X:%04X %08X:%04X %02X %08X:%08X %02X:%08lX " |
652586df | 2506 | "%08X %5u %8d %lu %d %pK %lu %lu %u %u %d", |
00fd38d9 | 2507 | i, src, srcp, dest, destp, state, |
47da8ee6 | 2508 | tp->write_seq - tp->snd_una, |
49d09007 | 2509 | rx_queue, |
1da177e4 | 2510 | timer_active, |
a399a805 | 2511 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 2512 | icsk->icsk_retransmits, |
a7cb5a49 | 2513 | from_kuid_munged(seq_user_ns(f), sock_i_uid(sk)), |
6687e988 | 2514 | icsk->icsk_probes_out, |
cf4c6bf8 IJ |
2515 | sock_i_ino(sk), |
2516 | atomic_read(&sk->sk_refcnt), sk, | |
7be87351 SH |
2517 | jiffies_to_clock_t(icsk->icsk_rto), |
2518 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 2519 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
1da177e4 | 2520 | tp->snd_cwnd, |
00fd38d9 ED |
2521 | state == TCP_LISTEN ? |
2522 | fastopenq->max_qlen : | |
652586df | 2523 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh)); |
1da177e4 LT |
2524 | } |
2525 | ||
cf533ea5 | 2526 | static void get_timewait4_sock(const struct inet_timewait_sock *tw, |
652586df | 2527 | struct seq_file *f, int i) |
1da177e4 | 2528 | { |
789f558c | 2529 | long delta = tw->tw_timer.expires - jiffies; |
23f33c2d | 2530 | __be32 dest, src; |
1da177e4 | 2531 | __u16 destp, srcp; |
1da177e4 LT |
2532 | |
2533 | dest = tw->tw_daddr; | |
2534 | src = tw->tw_rcv_saddr; | |
2535 | destp = ntohs(tw->tw_dport); | |
2536 | srcp = ntohs(tw->tw_sport); | |
2537 | ||
5e659e4c | 2538 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
652586df | 2539 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK", |
1da177e4 | 2540 | i, src, srcp, dest, destp, tw->tw_substate, 0, 0, |
a399a805 | 2541 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
652586df | 2542 | atomic_read(&tw->tw_refcnt), tw); |
1da177e4 LT |
2543 | } |
2544 | ||
2545 | #define TMPSZ 150 | |
2546 | ||
2547 | static int tcp4_seq_show(struct seq_file *seq, void *v) | |
2548 | { | |
5799de0b | 2549 | struct tcp_iter_state *st; |
05dbc7b5 | 2550 | struct sock *sk = v; |
1da177e4 | 2551 | |
652586df | 2552 | seq_setwidth(seq, TMPSZ - 1); |
1da177e4 | 2553 | if (v == SEQ_START_TOKEN) { |
652586df | 2554 | seq_puts(seq, " sl local_address rem_address st tx_queue " |
1da177e4 LT |
2555 | "rx_queue tr tm->when retrnsmt uid timeout " |
2556 | "inode"); | |
2557 | goto out; | |
2558 | } | |
2559 | st = seq->private; | |
2560 | ||
079096f1 ED |
2561 | if (sk->sk_state == TCP_TIME_WAIT) |
2562 | get_timewait4_sock(v, seq, st->num); | |
2563 | else if (sk->sk_state == TCP_NEW_SYN_RECV) | |
aa3a0c8c | 2564 | get_openreq4(v, seq, st->num); |
079096f1 ED |
2565 | else |
2566 | get_tcp4_sock(v, seq, st->num); | |
1da177e4 | 2567 | out: |
652586df | 2568 | seq_pad(seq, '\n'); |
1da177e4 LT |
2569 | return 0; |
2570 | } | |
2571 | ||
73cb88ec AV |
2572 | static const struct file_operations tcp_afinfo_seq_fops = { |
2573 | .owner = THIS_MODULE, | |
2574 | .open = tcp_seq_open, | |
2575 | .read = seq_read, | |
2576 | .llseek = seq_lseek, | |
2577 | .release = seq_release_net | |
2578 | }; | |
2579 | ||
1da177e4 | 2580 | static struct tcp_seq_afinfo tcp4_seq_afinfo = { |
1da177e4 LT |
2581 | .name = "tcp", |
2582 | .family = AF_INET, | |
73cb88ec | 2583 | .seq_fops = &tcp_afinfo_seq_fops, |
9427c4b3 DL |
2584 | .seq_ops = { |
2585 | .show = tcp4_seq_show, | |
2586 | }, | |
1da177e4 LT |
2587 | }; |
2588 | ||
2c8c1e72 | 2589 | static int __net_init tcp4_proc_init_net(struct net *net) |
757764f6 PE |
2590 | { |
2591 | return tcp_proc_register(net, &tcp4_seq_afinfo); | |
2592 | } | |
2593 | ||
2c8c1e72 | 2594 | static void __net_exit tcp4_proc_exit_net(struct net *net) |
757764f6 PE |
2595 | { |
2596 | tcp_proc_unregister(net, &tcp4_seq_afinfo); | |
2597 | } | |
2598 | ||
2599 | static struct pernet_operations tcp4_net_ops = { | |
2600 | .init = tcp4_proc_init_net, | |
2601 | .exit = tcp4_proc_exit_net, | |
2602 | }; | |
2603 | ||
1da177e4 LT |
2604 | int __init tcp4_proc_init(void) |
2605 | { | |
757764f6 | 2606 | return register_pernet_subsys(&tcp4_net_ops); |
1da177e4 LT |
2607 | } |
2608 | ||
2609 | void tcp4_proc_exit(void) | |
2610 | { | |
757764f6 | 2611 | unregister_pernet_subsys(&tcp4_net_ops); |
1da177e4 LT |
2612 | } |
2613 | #endif /* CONFIG_PROC_FS */ | |
2614 | ||
1cac41cb MB |
2615 | #ifdef CONFIG_MPTCP |
2616 | static void tcp_v4_clear_sk(struct sock *sk, int size) | |
2617 | { | |
2618 | struct tcp_sock *tp = tcp_sk(sk); | |
2619 | ||
2620 | /* we do not want to clear tk_table field, because of RCU lookups */ | |
2621 | sk_prot_clear_nulls(sk, offsetof(struct tcp_sock, tk_table.next)); | |
2622 | ||
2623 | memset(&tp->tk_table.pprev, 0, size - offsetof(struct tcp_sock, tk_table.pprev)); | |
2624 | } | |
2625 | ||
2626 | void tcp_copy_sk(struct sock *nsk, const struct sock *osk) | |
2627 | { | |
2628 | struct tcp_sock *ntp = tcp_sk(nsk); | |
2629 | struct tcp_sock *otp = tcp_sk(osk); | |
2630 | ||
2631 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); | |
2632 | ||
2633 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, | |
2634 | offsetof(struct tcp_sock, tk_table.next) - offsetof(struct sock, sk_dontcopy_end)); | |
2635 | ||
2636 | memcpy(&ntp->tk_table.pprev, &otp->tk_table.pprev, | |
2637 | osk->sk_prot->obj_size - offsetof(struct tcp_sock, tk_table.pprev)); | |
2638 | ||
2639 | ntp->tk_table.pprev = NULL; | |
2640 | } | |
2641 | #endif | |
2642 | ||
1da177e4 LT |
2643 | struct proto tcp_prot = { |
2644 | .name = "TCP", | |
2645 | .owner = THIS_MODULE, | |
2646 | .close = tcp_close, | |
2647 | .connect = tcp_v4_connect, | |
2648 | .disconnect = tcp_disconnect, | |
463c84b9 | 2649 | .accept = inet_csk_accept, |
1da177e4 LT |
2650 | .ioctl = tcp_ioctl, |
2651 | .init = tcp_v4_init_sock, | |
2652 | .destroy = tcp_v4_destroy_sock, | |
2653 | .shutdown = tcp_shutdown, | |
2654 | .setsockopt = tcp_setsockopt, | |
2655 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 2656 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
2657 | .sendmsg = tcp_sendmsg, |
2658 | .sendpage = tcp_sendpage, | |
1da177e4 | 2659 | .backlog_rcv = tcp_v4_do_rcv, |
46d3ceab | 2660 | .release_cb = tcp_release_cb, |
ab1e0a13 ACM |
2661 | .hash = inet_hash, |
2662 | .unhash = inet_unhash, | |
2663 | .get_port = inet_csk_get_port, | |
1da177e4 | 2664 | .enter_memory_pressure = tcp_enter_memory_pressure, |
c9bee3b7 | 2665 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 | 2666 | .sockets_allocated = &tcp_sockets_allocated, |
0a5578cf | 2667 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2668 | .memory_allocated = &tcp_memory_allocated, |
2669 | .memory_pressure = &tcp_memory_pressure, | |
a4fe34bf | 2670 | .sysctl_mem = sysctl_tcp_mem, |
1da177e4 LT |
2671 | .sysctl_wmem = sysctl_tcp_wmem, |
2672 | .sysctl_rmem = sysctl_tcp_rmem, | |
2673 | .max_header = MAX_TCP_HEADER, | |
2674 | .obj_size = sizeof(struct tcp_sock), | |
3ab5aee7 | 2675 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 2676 | .twsk_prot = &tcp_timewait_sock_ops, |
60236fdd | 2677 | .rsk_prot = &tcp_request_sock_ops, |
39d8cda7 | 2678 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 2679 | .no_autobind = true, |
543d9cfe ACM |
2680 | #ifdef CONFIG_COMPAT |
2681 | .compat_setsockopt = compat_tcp_setsockopt, | |
2682 | .compat_getsockopt = compat_tcp_getsockopt, | |
2683 | #endif | |
c255a458 | 2684 | #ifdef CONFIG_MEMCG_KMEM |
d1a4c0b3 GC |
2685 | .init_cgroup = tcp_init_cgroup, |
2686 | .destroy_cgroup = tcp_destroy_cgroup, | |
2687 | .proto_cgroup = tcp_proto_cgroup, | |
2688 | #endif | |
79170d8d | 2689 | .diag_destroy = tcp_abort, |
1cac41cb MB |
2690 | #ifdef CONFIG_MPTCP |
2691 | .clear_sk = tcp_v4_clear_sk, | |
2692 | .copy_sk = tcp_copy_sk, | |
2693 | #endif | |
1da177e4 | 2694 | }; |
4bc2f18b | 2695 | EXPORT_SYMBOL(tcp_prot); |
1da177e4 | 2696 | |
bdbbb852 ED |
2697 | static void __net_exit tcp_sk_exit(struct net *net) |
2698 | { | |
2699 | int cpu; | |
2700 | ||
2701 | for_each_possible_cpu(cpu) | |
2702 | inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv4.tcp_sk, cpu)); | |
2703 | free_percpu(net->ipv4.tcp_sk); | |
2704 | } | |
2705 | ||
046ee902 DL |
2706 | static int __net_init tcp_sk_init(struct net *net) |
2707 | { | |
bdbbb852 ED |
2708 | int res, cpu; |
2709 | ||
2710 | net->ipv4.tcp_sk = alloc_percpu(struct sock *); | |
2711 | if (!net->ipv4.tcp_sk) | |
2712 | return -ENOMEM; | |
2713 | ||
2714 | for_each_possible_cpu(cpu) { | |
2715 | struct sock *sk; | |
2716 | ||
2717 | res = inet_ctl_sock_create(&sk, PF_INET, SOCK_RAW, | |
2718 | IPPROTO_TCP, net); | |
2719 | if (res) | |
2720 | goto fail; | |
2721 | *per_cpu_ptr(net->ipv4.tcp_sk, cpu) = sk; | |
2722 | } | |
49213555 | 2723 | |
5d134f1c | 2724 | net->ipv4.sysctl_tcp_ecn = 2; |
49213555 DB |
2725 | net->ipv4.sysctl_tcp_ecn_fallback = 1; |
2726 | ||
b0f9ca53 | 2727 | net->ipv4.sysctl_tcp_base_mss = TCP_BASE_MSS; |
6b58e0a5 | 2728 | net->ipv4.sysctl_tcp_probe_threshold = TCP_PROBE_THRESHOLD; |
05cbc0db | 2729 | net->ipv4.sysctl_tcp_probe_interval = TCP_PROBE_INTERVAL; |
046ee902 | 2730 | |
49213555 | 2731 | return 0; |
bdbbb852 ED |
2732 | fail: |
2733 | tcp_sk_exit(net); | |
2734 | ||
2735 | return res; | |
b099ce26 EB |
2736 | } |
2737 | ||
2738 | static void __net_exit tcp_sk_exit_batch(struct list_head *net_exit_list) | |
2739 | { | |
2740 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET); | |
046ee902 DL |
2741 | } |
2742 | ||
2743 | static struct pernet_operations __net_initdata tcp_sk_ops = { | |
b099ce26 EB |
2744 | .init = tcp_sk_init, |
2745 | .exit = tcp_sk_exit, | |
2746 | .exit_batch = tcp_sk_exit_batch, | |
046ee902 DL |
2747 | }; |
2748 | ||
9b0f976f | 2749 | void __init tcp_v4_init(void) |
1da177e4 | 2750 | { |
5caea4ea | 2751 | inet_hashinfo_init(&tcp_hashinfo); |
6a1b3054 | 2752 | if (register_pernet_subsys(&tcp_sk_ops)) |
1da177e4 | 2753 | panic("Failed to create the TCP control socket.\n"); |
1da177e4 | 2754 | } |