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 | * PF_INET protocol family socket handler. | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Florian La Roche, <flla@stud.uni-sb.de> | |
11 | * Alan Cox, <A.Cox@swansea.ac.uk> | |
12 | * | |
13 | * Changes (see also sock.c) | |
14 | * | |
15 | * piggy, | |
16 | * Karl Knutson : Socket protocol table | |
17 | * A.N.Kuznetsov : Socket death error in accept(). | |
18 | * John Richardson : Fix non blocking error in connect() | |
19 | * so sockets that fail to connect | |
20 | * don't return -EINPROGRESS. | |
21 | * Alan Cox : Asynchronous I/O support | |
22 | * Alan Cox : Keep correct socket pointer on sock | |
23 | * structures | |
24 | * when accept() ed | |
25 | * Alan Cox : Semantics of SO_LINGER aren't state | |
26 | * moved to close when you look carefully. | |
27 | * With this fixed and the accept bug fixed | |
28 | * some RPC stuff seems happier. | |
29 | * Niibe Yutaka : 4.4BSD style write async I/O | |
30 | * Alan Cox, | |
31 | * Tony Gale : Fixed reuse semantics. | |
32 | * Alan Cox : bind() shouldn't abort existing but dead | |
33 | * sockets. Stops FTP netin:.. I hope. | |
34 | * Alan Cox : bind() works correctly for RAW sockets. | |
35 | * Note that FreeBSD at least was broken | |
36 | * in this respect so be careful with | |
37 | * compatibility tests... | |
38 | * Alan Cox : routing cache support | |
39 | * Alan Cox : memzero the socket structure for | |
40 | * compactness. | |
41 | * Matt Day : nonblock connect error handler | |
42 | * Alan Cox : Allow large numbers of pending sockets | |
43 | * (eg for big web sites), but only if | |
44 | * specifically application requested. | |
45 | * Alan Cox : New buffering throughout IP. Used | |
46 | * dumbly. | |
47 | * Alan Cox : New buffering now used smartly. | |
48 | * Alan Cox : BSD rather than common sense | |
49 | * interpretation of listen. | |
50 | * Germano Caronni : Assorted small races. | |
51 | * Alan Cox : sendmsg/recvmsg basic support. | |
52 | * Alan Cox : Only sendmsg/recvmsg now supported. | |
53 | * Alan Cox : Locked down bind (see security list). | |
54 | * Alan Cox : Loosened bind a little. | |
55 | * Mike McLagan : ADD/DEL DLCI Ioctls | |
56 | * Willy Konynenberg : Transparent proxying support. | |
57 | * David S. Miller : New socket lookup architecture. | |
58 | * Some other random speedups. | |
59 | * Cyrus Durgin : Cleaned up file for kmod hacks. | |
60 | * Andi Kleen : Fix inet_stream_connect TCP race. | |
61 | * | |
62 | * This program is free software; you can redistribute it and/or | |
63 | * modify it under the terms of the GNU General Public License | |
64 | * as published by the Free Software Foundation; either version | |
65 | * 2 of the License, or (at your option) any later version. | |
66 | */ | |
67 | ||
afd46503 JP |
68 | #define pr_fmt(fmt) "IPv4: " fmt |
69 | ||
f4c50d99 | 70 | #include <linux/err.h> |
1da177e4 LT |
71 | #include <linux/errno.h> |
72 | #include <linux/types.h> | |
73 | #include <linux/socket.h> | |
74 | #include <linux/in.h> | |
75 | #include <linux/kernel.h> | |
1da177e4 LT |
76 | #include <linux/module.h> |
77 | #include <linux/sched.h> | |
78 | #include <linux/timer.h> | |
79 | #include <linux/string.h> | |
80 | #include <linux/sockios.h> | |
81 | #include <linux/net.h> | |
4fc268d2 | 82 | #include <linux/capability.h> |
1da177e4 LT |
83 | #include <linux/fcntl.h> |
84 | #include <linux/mm.h> | |
85 | #include <linux/interrupt.h> | |
86 | #include <linux/stat.h> | |
87 | #include <linux/init.h> | |
88 | #include <linux/poll.h> | |
89 | #include <linux/netfilter_ipv4.h> | |
b3da2cf3 | 90 | #include <linux/random.h> |
5a0e3ad6 | 91 | #include <linux/slab.h> |
1da177e4 LT |
92 | |
93 | #include <asm/uaccess.h> | |
1da177e4 | 94 | |
1da177e4 LT |
95 | #include <linux/inet.h> |
96 | #include <linux/igmp.h> | |
14c85021 | 97 | #include <linux/inetdevice.h> |
1da177e4 | 98 | #include <linux/netdevice.h> |
73cc19f1 | 99 | #include <net/checksum.h> |
1da177e4 LT |
100 | #include <net/ip.h> |
101 | #include <net/protocol.h> | |
102 | #include <net/arp.h> | |
103 | #include <net/route.h> | |
104 | #include <net/ip_fib.h> | |
295f7324 | 105 | #include <net/inet_connection_sock.h> |
1da177e4 LT |
106 | #include <net/tcp.h> |
107 | #include <net/udp.h> | |
ba4e58ec | 108 | #include <net/udplite.h> |
c319b4d7 | 109 | #include <net/ping.h> |
1da177e4 LT |
110 | #include <linux/skbuff.h> |
111 | #include <net/sock.h> | |
112 | #include <net/raw.h> | |
113 | #include <net/icmp.h> | |
1da177e4 LT |
114 | #include <net/inet_common.h> |
115 | #include <net/xfrm.h> | |
9b4661bd | 116 | #include <net/net_namespace.h> |
aebda156 | 117 | #include <net/secure_seq.h> |
1da177e4 LT |
118 | #ifdef CONFIG_IP_MROUTE |
119 | #include <linux/mroute.h> | |
120 | #endif | |
121 | ||
1da177e4 LT |
122 | |
123 | /* The inetsw table contains everything that inet_create needs to | |
124 | * build a new socket. | |
125 | */ | |
126 | static struct list_head inetsw[SOCK_MAX]; | |
127 | static DEFINE_SPINLOCK(inetsw_lock); | |
128 | ||
9ba63979 | 129 | struct ipv4_config ipv4_config; |
9ba63979 PE |
130 | EXPORT_SYMBOL(ipv4_config); |
131 | ||
1da177e4 LT |
132 | /* New destruction routine */ |
133 | ||
134 | void inet_sock_destruct(struct sock *sk) | |
135 | { | |
136 | struct inet_sock *inet = inet_sk(sk); | |
137 | ||
138 | __skb_queue_purge(&sk->sk_receive_queue); | |
139 | __skb_queue_purge(&sk->sk_error_queue); | |
140 | ||
95766fff HA |
141 | sk_mem_reclaim(sk); |
142 | ||
1da177e4 | 143 | if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { |
3d1427f8 | 144 | pr_err("Attempt to release TCP socket in state %d %p\n", |
1da177e4 LT |
145 | sk->sk_state, sk); |
146 | return; | |
147 | } | |
148 | if (!sock_flag(sk, SOCK_DEAD)) { | |
3d1427f8 | 149 | pr_err("Attempt to release alive inet socket %p\n", sk); |
1da177e4 LT |
150 | return; |
151 | } | |
152 | ||
547b792c IJ |
153 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
154 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); | |
155 | WARN_ON(sk->sk_wmem_queued); | |
156 | WARN_ON(sk->sk_forward_alloc); | |
1da177e4 | 157 | |
f6d8bd05 | 158 | kfree(rcu_dereference_protected(inet->inet_opt, 1)); |
b6c6712a | 159 | dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); |
41063e9d | 160 | dst_release(sk->sk_rx_dst); |
e6848976 | 161 | sk_refcnt_debug_dec(sk); |
1da177e4 | 162 | } |
3d1427f8 | 163 | EXPORT_SYMBOL(inet_sock_destruct); |
1da177e4 LT |
164 | |
165 | /* | |
166 | * The routines beyond this point handle the behaviour of an AF_INET | |
167 | * socket object. Mostly it punts to the subprotocols of IP to do | |
168 | * the work. | |
169 | */ | |
170 | ||
171 | /* | |
172 | * Automatically bind an unbound socket. | |
173 | */ | |
174 | ||
175 | static int inet_autobind(struct sock *sk) | |
176 | { | |
177 | struct inet_sock *inet; | |
178 | /* We may need to bind the socket. */ | |
179 | lock_sock(sk); | |
180 | inet = inet_sk(sk); | |
c720c7e8 | 181 | if (!inet->inet_num) { |
1da177e4 LT |
182 | if (sk->sk_prot->get_port(sk, 0)) { |
183 | release_sock(sk); | |
184 | return -EAGAIN; | |
185 | } | |
c720c7e8 | 186 | inet->inet_sport = htons(inet->inet_num); |
1da177e4 LT |
187 | } |
188 | release_sock(sk); | |
189 | return 0; | |
190 | } | |
191 | ||
192 | /* | |
193 | * Move a socket into listening state. | |
194 | */ | |
195 | int inet_listen(struct socket *sock, int backlog) | |
196 | { | |
197 | struct sock *sk = sock->sk; | |
198 | unsigned char old_state; | |
199 | int err; | |
200 | ||
201 | lock_sock(sk); | |
202 | ||
203 | err = -EINVAL; | |
204 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) | |
205 | goto out; | |
206 | ||
207 | old_state = sk->sk_state; | |
208 | if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) | |
209 | goto out; | |
210 | ||
211 | /* Really, if the socket is already in listen state | |
212 | * we can only allow the backlog to be adjusted. | |
213 | */ | |
214 | if (old_state != TCP_LISTEN) { | |
8336886f JC |
215 | /* Check special setups for testing purpose to enable TFO w/o |
216 | * requiring TCP_FASTOPEN sockopt. | |
217 | * Note that only TCP sockets (SOCK_STREAM) will reach here. | |
218 | * Also fastopenq may already been allocated because this | |
219 | * socket was in TCP_LISTEN state previously but was | |
220 | * shutdown() (rather than close()). | |
221 | */ | |
222 | if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) != 0 && | |
223 | inet_csk(sk)->icsk_accept_queue.fastopenq == NULL) { | |
224 | if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) != 0) | |
225 | err = fastopen_init_queue(sk, backlog); | |
226 | else if ((sysctl_tcp_fastopen & | |
227 | TFO_SERVER_WO_SOCKOPT2) != 0) | |
228 | err = fastopen_init_queue(sk, | |
229 | ((uint)sysctl_tcp_fastopen) >> 16); | |
230 | else | |
231 | err = 0; | |
232 | if (err) | |
233 | goto out; | |
234 | } | |
72a3effa | 235 | err = inet_csk_listen_start(sk, backlog); |
1da177e4 LT |
236 | if (err) |
237 | goto out; | |
238 | } | |
239 | sk->sk_max_ack_backlog = backlog; | |
240 | err = 0; | |
241 | ||
242 | out: | |
243 | release_sock(sk); | |
244 | return err; | |
245 | } | |
3d1427f8 | 246 | EXPORT_SYMBOL(inet_listen); |
1da177e4 | 247 | |
be776281 | 248 | u32 inet_ehash_secret __read_mostly; |
b3da2cf3 DM |
249 | EXPORT_SYMBOL(inet_ehash_secret); |
250 | ||
08dcdbf6 ED |
251 | u32 ipv6_hash_secret __read_mostly; |
252 | EXPORT_SYMBOL(ipv6_hash_secret); | |
253 | ||
be776281 | 254 | /* |
08dcdbf6 ED |
255 | * inet_ehash_secret must be set exactly once, and to a non nul value |
256 | * ipv6_hash_secret must be set exactly once. | |
be776281 | 257 | */ |
b3da2cf3 DM |
258 | void build_ehash_secret(void) |
259 | { | |
be776281 | 260 | u32 rnd; |
49e8ab03 | 261 | |
be776281 ED |
262 | do { |
263 | get_random_bytes(&rnd, sizeof(rnd)); | |
264 | } while (rnd == 0); | |
49e8ab03 | 265 | |
9a3bab6b | 266 | if (cmpxchg(&inet_ehash_secret, 0, rnd) == 0) |
08dcdbf6 | 267 | get_random_bytes(&ipv6_hash_secret, sizeof(ipv6_hash_secret)); |
b3da2cf3 DM |
268 | } |
269 | EXPORT_SYMBOL(build_ehash_secret); | |
270 | ||
1da177e4 LT |
271 | /* |
272 | * Create an inet socket. | |
273 | */ | |
274 | ||
3f378b68 EP |
275 | static int inet_create(struct net *net, struct socket *sock, int protocol, |
276 | int kern) | |
1da177e4 LT |
277 | { |
278 | struct sock *sk; | |
1da177e4 LT |
279 | struct inet_protosw *answer; |
280 | struct inet_sock *inet; | |
281 | struct proto *answer_prot; | |
282 | unsigned char answer_flags; | |
283 | char answer_no_check; | |
bb97d31f | 284 | int try_loading_module = 0; |
86c8f9d1 | 285 | int err; |
1da177e4 | 286 | |
04f258ce ED |
287 | if (unlikely(!inet_ehash_secret)) |
288 | if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) | |
289 | build_ehash_secret(); | |
b3da2cf3 | 290 | |
1da177e4 LT |
291 | sock->state = SS_UNCONNECTED; |
292 | ||
293 | /* Look for the requested type/protocol pair. */ | |
bb97d31f | 294 | lookup_protocol: |
86c8f9d1 | 295 | err = -ESOCKTNOSUPPORT; |
1da177e4 | 296 | rcu_read_lock(); |
696adfe8 | 297 | list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { |
1da177e4 | 298 | |
696adfe8 | 299 | err = 0; |
1da177e4 LT |
300 | /* Check the non-wild match. */ |
301 | if (protocol == answer->protocol) { | |
302 | if (protocol != IPPROTO_IP) | |
303 | break; | |
304 | } else { | |
305 | /* Check for the two wild cases. */ | |
306 | if (IPPROTO_IP == protocol) { | |
307 | protocol = answer->protocol; | |
308 | break; | |
309 | } | |
310 | if (IPPROTO_IP == answer->protocol) | |
311 | break; | |
312 | } | |
86c8f9d1 | 313 | err = -EPROTONOSUPPORT; |
1da177e4 LT |
314 | } |
315 | ||
696adfe8 | 316 | if (unlikely(err)) { |
bb97d31f ACM |
317 | if (try_loading_module < 2) { |
318 | rcu_read_unlock(); | |
319 | /* | |
320 | * Be more specific, e.g. net-pf-2-proto-132-type-1 | |
321 | * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) | |
322 | */ | |
323 | if (++try_loading_module == 1) | |
324 | request_module("net-pf-%d-proto-%d-type-%d", | |
325 | PF_INET, protocol, sock->type); | |
326 | /* | |
327 | * Fall back to generic, e.g. net-pf-2-proto-132 | |
328 | * (net-pf-PF_INET-proto-IPPROTO_SCTP) | |
329 | */ | |
330 | else | |
331 | request_module("net-pf-%d-proto-%d", | |
332 | PF_INET, protocol); | |
333 | goto lookup_protocol; | |
334 | } else | |
335 | goto out_rcu_unlock; | |
336 | } | |
337 | ||
1da177e4 | 338 | err = -EPERM; |
52e804c6 EB |
339 | if (sock->type == SOCK_RAW && !kern && |
340 | !ns_capable(net->user_ns, CAP_NET_RAW)) | |
1da177e4 | 341 | goto out_rcu_unlock; |
1da177e4 LT |
342 | |
343 | sock->ops = answer->ops; | |
344 | answer_prot = answer->prot; | |
345 | answer_no_check = answer->no_check; | |
346 | answer_flags = answer->flags; | |
347 | rcu_read_unlock(); | |
348 | ||
547b792c | 349 | WARN_ON(answer_prot->slab == NULL); |
1da177e4 LT |
350 | |
351 | err = -ENOBUFS; | |
6257ff21 | 352 | sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); |
1da177e4 LT |
353 | if (sk == NULL) |
354 | goto out; | |
355 | ||
356 | err = 0; | |
357 | sk->sk_no_check = answer_no_check; | |
358 | if (INET_PROTOSW_REUSE & answer_flags) | |
4a17fd52 | 359 | sk->sk_reuse = SK_CAN_REUSE; |
1da177e4 LT |
360 | |
361 | inet = inet_sk(sk); | |
469de9b9 | 362 | inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; |
1da177e4 | 363 | |
7b2ff18e JO |
364 | inet->nodefrag = 0; |
365 | ||
1da177e4 | 366 | if (SOCK_RAW == sock->type) { |
c720c7e8 | 367 | inet->inet_num = protocol; |
1da177e4 LT |
368 | if (IPPROTO_RAW == protocol) |
369 | inet->hdrincl = 1; | |
370 | } | |
371 | ||
372 | if (ipv4_config.no_pmtu_disc) | |
373 | inet->pmtudisc = IP_PMTUDISC_DONT; | |
374 | else | |
375 | inet->pmtudisc = IP_PMTUDISC_WANT; | |
376 | ||
c720c7e8 | 377 | inet->inet_id = 0; |
1da177e4 LT |
378 | |
379 | sock_init_data(sock, sk); | |
380 | ||
381 | sk->sk_destruct = inet_sock_destruct; | |
1da177e4 LT |
382 | sk->sk_protocol = protocol; |
383 | sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; | |
384 | ||
385 | inet->uc_ttl = -1; | |
386 | inet->mc_loop = 1; | |
387 | inet->mc_ttl = 1; | |
f771bef9 | 388 | inet->mc_all = 1; |
1da177e4 LT |
389 | inet->mc_index = 0; |
390 | inet->mc_list = NULL; | |
4c507d28 | 391 | inet->rcv_tos = 0; |
1da177e4 | 392 | |
e6848976 | 393 | sk_refcnt_debug_inc(sk); |
1da177e4 | 394 | |
c720c7e8 | 395 | if (inet->inet_num) { |
1da177e4 LT |
396 | /* It assumes that any protocol which allows |
397 | * the user to assign a number at socket | |
398 | * creation time automatically | |
399 | * shares. | |
400 | */ | |
c720c7e8 | 401 | inet->inet_sport = htons(inet->inet_num); |
1da177e4 LT |
402 | /* Add to protocol hash chains. */ |
403 | sk->sk_prot->hash(sk); | |
404 | } | |
405 | ||
406 | if (sk->sk_prot->init) { | |
407 | err = sk->sk_prot->init(sk); | |
408 | if (err) | |
409 | sk_common_release(sk); | |
410 | } | |
411 | out: | |
412 | return err; | |
413 | out_rcu_unlock: | |
414 | rcu_read_unlock(); | |
415 | goto out; | |
416 | } | |
417 | ||
418 | ||
419 | /* | |
420 | * The peer socket should always be NULL (or else). When we call this | |
421 | * function we are destroying the object and from then on nobody | |
422 | * should refer to it. | |
423 | */ | |
424 | int inet_release(struct socket *sock) | |
425 | { | |
426 | struct sock *sk = sock->sk; | |
427 | ||
428 | if (sk) { | |
429 | long timeout; | |
430 | ||
c58dc01b | 431 | sock_rps_reset_flow(sk); |
fec5e652 | 432 | |
1da177e4 LT |
433 | /* Applications forget to leave groups before exiting */ |
434 | ip_mc_drop_socket(sk); | |
435 | ||
436 | /* If linger is set, we don't return until the close | |
437 | * is complete. Otherwise we return immediately. The | |
438 | * actually closing is done the same either way. | |
439 | * | |
440 | * If the close is due to the process exiting, we never | |
441 | * linger.. | |
442 | */ | |
443 | timeout = 0; | |
444 | if (sock_flag(sk, SOCK_LINGER) && | |
445 | !(current->flags & PF_EXITING)) | |
446 | timeout = sk->sk_lingertime; | |
447 | sock->sk = NULL; | |
448 | sk->sk_prot->close(sk, timeout); | |
449 | } | |
450 | return 0; | |
451 | } | |
3d1427f8 | 452 | EXPORT_SYMBOL(inet_release); |
1da177e4 LT |
453 | |
454 | /* It is off by default, see below. */ | |
ab32ea5d | 455 | int sysctl_ip_nonlocal_bind __read_mostly; |
3d1427f8 | 456 | EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); |
1da177e4 LT |
457 | |
458 | int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
459 | { | |
460 | struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; | |
461 | struct sock *sk = sock->sk; | |
462 | struct inet_sock *inet = inet_sk(sk); | |
3594698a | 463 | struct net *net = sock_net(sk); |
1da177e4 LT |
464 | unsigned short snum; |
465 | int chk_addr_ret; | |
466 | int err; | |
467 | ||
468 | /* If the socket has its own bind function then use it. (RAW) */ | |
469 | if (sk->sk_prot->bind) { | |
470 | err = sk->sk_prot->bind(sk, uaddr, addr_len); | |
471 | goto out; | |
472 | } | |
473 | err = -EINVAL; | |
474 | if (addr_len < sizeof(struct sockaddr_in)) | |
475 | goto out; | |
476 | ||
c349a528 | 477 | if (addr->sin_family != AF_INET) { |
29c486df ED |
478 | /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) |
479 | * only if s_addr is INADDR_ANY. | |
480 | */ | |
c349a528 | 481 | err = -EAFNOSUPPORT; |
29c486df ED |
482 | if (addr->sin_family != AF_UNSPEC || |
483 | addr->sin_addr.s_addr != htonl(INADDR_ANY)) | |
484 | goto out; | |
c349a528 | 485 | } |
d0733d2e | 486 | |
3594698a | 487 | chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); |
1da177e4 LT |
488 | |
489 | /* Not specified by any standard per-se, however it breaks too | |
490 | * many applications when removed. It is unfortunate since | |
491 | * allowing applications to make a non-local bind solves | |
492 | * several problems with systems using dynamic addressing. | |
493 | * (ie. your servers still start up even if your ISDN link | |
494 | * is temporarily down) | |
495 | */ | |
496 | err = -EADDRNOTAVAIL; | |
497 | if (!sysctl_ip_nonlocal_bind && | |
b9fb1506 | 498 | !(inet->freebind || inet->transparent) && |
e6f1cebf | 499 | addr->sin_addr.s_addr != htonl(INADDR_ANY) && |
1da177e4 LT |
500 | chk_addr_ret != RTN_LOCAL && |
501 | chk_addr_ret != RTN_MULTICAST && | |
502 | chk_addr_ret != RTN_BROADCAST) | |
503 | goto out; | |
504 | ||
505 | snum = ntohs(addr->sin_port); | |
506 | err = -EACCES; | |
3594698a EB |
507 | if (snum && snum < PROT_SOCK && |
508 | !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) | |
1da177e4 LT |
509 | goto out; |
510 | ||
511 | /* We keep a pair of addresses. rcv_saddr is the one | |
512 | * used by hash lookups, and saddr is used for transmit. | |
513 | * | |
514 | * In the BSD API these are the same except where it | |
515 | * would be illegal to use them (multicast/broadcast) in | |
516 | * which case the sending device address is used. | |
517 | */ | |
518 | lock_sock(sk); | |
519 | ||
520 | /* Check these errors (active socket, double bind). */ | |
521 | err = -EINVAL; | |
c720c7e8 | 522 | if (sk->sk_state != TCP_CLOSE || inet->inet_num) |
1da177e4 LT |
523 | goto out_release_sock; |
524 | ||
c720c7e8 | 525 | inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; |
1da177e4 | 526 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) |
c720c7e8 | 527 | inet->inet_saddr = 0; /* Use device */ |
1da177e4 LT |
528 | |
529 | /* Make sure we are allowed to bind here. */ | |
530 | if (sk->sk_prot->get_port(sk, snum)) { | |
c720c7e8 | 531 | inet->inet_saddr = inet->inet_rcv_saddr = 0; |
1da177e4 LT |
532 | err = -EADDRINUSE; |
533 | goto out_release_sock; | |
534 | } | |
535 | ||
c720c7e8 | 536 | if (inet->inet_rcv_saddr) |
1da177e4 LT |
537 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; |
538 | if (snum) | |
539 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
c720c7e8 ED |
540 | inet->inet_sport = htons(inet->inet_num); |
541 | inet->inet_daddr = 0; | |
542 | inet->inet_dport = 0; | |
1da177e4 LT |
543 | sk_dst_reset(sk); |
544 | err = 0; | |
545 | out_release_sock: | |
546 | release_sock(sk); | |
547 | out: | |
548 | return err; | |
549 | } | |
3d1427f8 | 550 | EXPORT_SYMBOL(inet_bind); |
1da177e4 | 551 | |
5e73ea1a | 552 | int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, |
1da177e4 LT |
553 | int addr_len, int flags) |
554 | { | |
555 | struct sock *sk = sock->sk; | |
556 | ||
6503d961 CG |
557 | if (addr_len < sizeof(uaddr->sa_family)) |
558 | return -EINVAL; | |
1da177e4 LT |
559 | if (uaddr->sa_family == AF_UNSPEC) |
560 | return sk->sk_prot->disconnect(sk, flags); | |
561 | ||
c720c7e8 | 562 | if (!inet_sk(sk)->inet_num && inet_autobind(sk)) |
1da177e4 | 563 | return -EAGAIN; |
e3192690 | 564 | return sk->sk_prot->connect(sk, uaddr, addr_len); |
1da177e4 | 565 | } |
3d1427f8 | 566 | EXPORT_SYMBOL(inet_dgram_connect); |
1da177e4 | 567 | |
783237e8 | 568 | static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) |
1da177e4 LT |
569 | { |
570 | DEFINE_WAIT(wait); | |
571 | ||
aa395145 | 572 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
783237e8 | 573 | sk->sk_write_pending += writebias; |
1da177e4 LT |
574 | |
575 | /* Basic assumption: if someone sets sk->sk_err, he _must_ | |
576 | * change state of the socket from TCP_SYN_*. | |
577 | * Connect() does not allow to get error notifications | |
578 | * without closing the socket. | |
579 | */ | |
580 | while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { | |
581 | release_sock(sk); | |
582 | timeo = schedule_timeout(timeo); | |
583 | lock_sock(sk); | |
584 | if (signal_pending(current) || !timeo) | |
585 | break; | |
aa395145 | 586 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 | 587 | } |
aa395145 | 588 | finish_wait(sk_sleep(sk), &wait); |
783237e8 | 589 | sk->sk_write_pending -= writebias; |
1da177e4 LT |
590 | return timeo; |
591 | } | |
592 | ||
593 | /* | |
594 | * Connect to a remote host. There is regrettably still a little | |
595 | * TCP 'magic' in here. | |
596 | */ | |
cf60af03 YC |
597 | int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, |
598 | int addr_len, int flags) | |
1da177e4 LT |
599 | { |
600 | struct sock *sk = sock->sk; | |
601 | int err; | |
602 | long timeo; | |
603 | ||
6503d961 CG |
604 | if (addr_len < sizeof(uaddr->sa_family)) |
605 | return -EINVAL; | |
606 | ||
1da177e4 LT |
607 | if (uaddr->sa_family == AF_UNSPEC) { |
608 | err = sk->sk_prot->disconnect(sk, flags); | |
609 | sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; | |
610 | goto out; | |
611 | } | |
612 | ||
613 | switch (sock->state) { | |
614 | default: | |
615 | err = -EINVAL; | |
616 | goto out; | |
617 | case SS_CONNECTED: | |
618 | err = -EISCONN; | |
619 | goto out; | |
620 | case SS_CONNECTING: | |
621 | err = -EALREADY; | |
622 | /* Fall out of switch with err, set for this state */ | |
623 | break; | |
624 | case SS_UNCONNECTED: | |
625 | err = -EISCONN; | |
626 | if (sk->sk_state != TCP_CLOSE) | |
627 | goto out; | |
628 | ||
629 | err = sk->sk_prot->connect(sk, uaddr, addr_len); | |
630 | if (err < 0) | |
631 | goto out; | |
632 | ||
e905a9ed | 633 | sock->state = SS_CONNECTING; |
1da177e4 LT |
634 | |
635 | /* Just entered SS_CONNECTING state; the only | |
636 | * difference is that return value in non-blocking | |
637 | * case is EINPROGRESS, rather than EALREADY. | |
638 | */ | |
639 | err = -EINPROGRESS; | |
640 | break; | |
641 | } | |
642 | ||
643 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); | |
644 | ||
645 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { | |
783237e8 YC |
646 | int writebias = (sk->sk_protocol == IPPROTO_TCP) && |
647 | tcp_sk(sk)->fastopen_req && | |
648 | tcp_sk(sk)->fastopen_req->data ? 1 : 0; | |
649 | ||
1da177e4 | 650 | /* Error code is set above */ |
783237e8 | 651 | if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) |
1da177e4 LT |
652 | goto out; |
653 | ||
654 | err = sock_intr_errno(timeo); | |
655 | if (signal_pending(current)) | |
656 | goto out; | |
657 | } | |
658 | ||
659 | /* Connection was closed by RST, timeout, ICMP error | |
660 | * or another process disconnected us. | |
661 | */ | |
662 | if (sk->sk_state == TCP_CLOSE) | |
663 | goto sock_error; | |
664 | ||
665 | /* sk->sk_err may be not zero now, if RECVERR was ordered by user | |
666 | * and error was received after socket entered established state. | |
667 | * Hence, it is handled normally after connect() return successfully. | |
668 | */ | |
669 | ||
670 | sock->state = SS_CONNECTED; | |
671 | err = 0; | |
672 | out: | |
1da177e4 LT |
673 | return err; |
674 | ||
675 | sock_error: | |
676 | err = sock_error(sk) ? : -ECONNABORTED; | |
677 | sock->state = SS_UNCONNECTED; | |
678 | if (sk->sk_prot->disconnect(sk, flags)) | |
679 | sock->state = SS_DISCONNECTING; | |
680 | goto out; | |
681 | } | |
cf60af03 YC |
682 | EXPORT_SYMBOL(__inet_stream_connect); |
683 | ||
684 | int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, | |
685 | int addr_len, int flags) | |
686 | { | |
687 | int err; | |
688 | ||
689 | lock_sock(sock->sk); | |
690 | err = __inet_stream_connect(sock, uaddr, addr_len, flags); | |
691 | release_sock(sock->sk); | |
692 | return err; | |
693 | } | |
3d1427f8 | 694 | EXPORT_SYMBOL(inet_stream_connect); |
1da177e4 LT |
695 | |
696 | /* | |
697 | * Accept a pending connection. The TCP layer now gives BSD semantics. | |
698 | */ | |
699 | ||
700 | int inet_accept(struct socket *sock, struct socket *newsock, int flags) | |
701 | { | |
702 | struct sock *sk1 = sock->sk; | |
703 | int err = -EINVAL; | |
704 | struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); | |
705 | ||
706 | if (!sk2) | |
707 | goto do_err; | |
708 | ||
709 | lock_sock(sk2); | |
710 | ||
1eddcead | 711 | sock_rps_record_flow(sk2); |
547b792c | 712 | WARN_ON(!((1 << sk2->sk_state) & |
8336886f JC |
713 | (TCPF_ESTABLISHED | TCPF_SYN_RECV | |
714 | TCPF_CLOSE_WAIT | TCPF_CLOSE))); | |
1da177e4 LT |
715 | |
716 | sock_graft(sk2, newsock); | |
717 | ||
718 | newsock->state = SS_CONNECTED; | |
719 | err = 0; | |
720 | release_sock(sk2); | |
721 | do_err: | |
722 | return err; | |
723 | } | |
3d1427f8 | 724 | EXPORT_SYMBOL(inet_accept); |
1da177e4 LT |
725 | |
726 | ||
727 | /* | |
728 | * This does both peername and sockname. | |
729 | */ | |
730 | int inet_getname(struct socket *sock, struct sockaddr *uaddr, | |
731 | int *uaddr_len, int peer) | |
732 | { | |
733 | struct sock *sk = sock->sk; | |
734 | struct inet_sock *inet = inet_sk(sk); | |
38bfd8f5 | 735 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); |
1da177e4 LT |
736 | |
737 | sin->sin_family = AF_INET; | |
738 | if (peer) { | |
c720c7e8 | 739 | if (!inet->inet_dport || |
1da177e4 LT |
740 | (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && |
741 | peer == 1)) | |
742 | return -ENOTCONN; | |
c720c7e8 ED |
743 | sin->sin_port = inet->inet_dport; |
744 | sin->sin_addr.s_addr = inet->inet_daddr; | |
1da177e4 | 745 | } else { |
c720c7e8 | 746 | __be32 addr = inet->inet_rcv_saddr; |
1da177e4 | 747 | if (!addr) |
c720c7e8 ED |
748 | addr = inet->inet_saddr; |
749 | sin->sin_port = inet->inet_sport; | |
1da177e4 LT |
750 | sin->sin_addr.s_addr = addr; |
751 | } | |
752 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
753 | *uaddr_len = sizeof(*sin); | |
754 | return 0; | |
755 | } | |
3d1427f8 | 756 | EXPORT_SYMBOL(inet_getname); |
1da177e4 LT |
757 | |
758 | int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, | |
759 | size_t size) | |
760 | { | |
761 | struct sock *sk = sock->sk; | |
762 | ||
c58dc01b | 763 | sock_rps_record_flow(sk); |
fec5e652 | 764 | |
1da177e4 | 765 | /* We may need to bind the socket. */ |
7ba42910 CG |
766 | if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && |
767 | inet_autobind(sk)) | |
1da177e4 LT |
768 | return -EAGAIN; |
769 | ||
770 | return sk->sk_prot->sendmsg(iocb, sk, msg, size); | |
771 | } | |
3d1427f8 | 772 | EXPORT_SYMBOL(inet_sendmsg); |
1da177e4 | 773 | |
7ba42910 CG |
774 | ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, |
775 | size_t size, int flags) | |
1da177e4 LT |
776 | { |
777 | struct sock *sk = sock->sk; | |
778 | ||
c58dc01b | 779 | sock_rps_record_flow(sk); |
fec5e652 | 780 | |
1da177e4 | 781 | /* We may need to bind the socket. */ |
7ba42910 CG |
782 | if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && |
783 | inet_autobind(sk)) | |
1da177e4 LT |
784 | return -EAGAIN; |
785 | ||
786 | if (sk->sk_prot->sendpage) | |
787 | return sk->sk_prot->sendpage(sk, page, offset, size, flags); | |
788 | return sock_no_sendpage(sock, page, offset, size, flags); | |
789 | } | |
7ba42910 | 790 | EXPORT_SYMBOL(inet_sendpage); |
1da177e4 | 791 | |
fec5e652 TH |
792 | int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, |
793 | size_t size, int flags) | |
794 | { | |
795 | struct sock *sk = sock->sk; | |
796 | int addr_len = 0; | |
797 | int err; | |
798 | ||
c58dc01b | 799 | sock_rps_record_flow(sk); |
fec5e652 TH |
800 | |
801 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, | |
802 | flags & ~MSG_DONTWAIT, &addr_len); | |
803 | if (err >= 0) | |
804 | msg->msg_namelen = addr_len; | |
805 | return err; | |
806 | } | |
807 | EXPORT_SYMBOL(inet_recvmsg); | |
1da177e4 LT |
808 | |
809 | int inet_shutdown(struct socket *sock, int how) | |
810 | { | |
811 | struct sock *sk = sock->sk; | |
812 | int err = 0; | |
813 | ||
814 | /* This should really check to make sure | |
815 | * the socket is a TCP socket. (WHY AC...) | |
816 | */ | |
817 | how++; /* maps 0->1 has the advantage of making bit 1 rcvs and | |
818 | 1->2 bit 2 snds. | |
819 | 2->3 */ | |
820 | if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ | |
821 | return -EINVAL; | |
822 | ||
823 | lock_sock(sk); | |
824 | if (sock->state == SS_CONNECTING) { | |
825 | if ((1 << sk->sk_state) & | |
826 | (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) | |
827 | sock->state = SS_DISCONNECTING; | |
828 | else | |
829 | sock->state = SS_CONNECTED; | |
830 | } | |
831 | ||
832 | switch (sk->sk_state) { | |
833 | case TCP_CLOSE: | |
834 | err = -ENOTCONN; | |
835 | /* Hack to wake up other listeners, who can poll for | |
836 | POLLHUP, even on eg. unconnected UDP sockets -- RR */ | |
837 | default: | |
838 | sk->sk_shutdown |= how; | |
839 | if (sk->sk_prot->shutdown) | |
840 | sk->sk_prot->shutdown(sk, how); | |
841 | break; | |
842 | ||
843 | /* Remaining two branches are temporary solution for missing | |
844 | * close() in multithreaded environment. It is _not_ a good idea, | |
845 | * but we have no choice until close() is repaired at VFS level. | |
846 | */ | |
847 | case TCP_LISTEN: | |
848 | if (!(how & RCV_SHUTDOWN)) | |
849 | break; | |
850 | /* Fall through */ | |
851 | case TCP_SYN_SENT: | |
852 | err = sk->sk_prot->disconnect(sk, O_NONBLOCK); | |
853 | sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; | |
854 | break; | |
855 | } | |
856 | ||
857 | /* Wake up anyone sleeping in poll. */ | |
858 | sk->sk_state_change(sk); | |
859 | release_sock(sk); | |
860 | return err; | |
861 | } | |
3d1427f8 | 862 | EXPORT_SYMBOL(inet_shutdown); |
1da177e4 LT |
863 | |
864 | /* | |
865 | * ioctl() calls you can issue on an INET socket. Most of these are | |
866 | * device configuration and stuff and very rarely used. Some ioctls | |
867 | * pass on to the socket itself. | |
868 | * | |
869 | * NOTE: I like the idea of a module for the config stuff. ie ifconfig | |
870 | * loads the devconfigure module does its configuring and unloads it. | |
871 | * There's a good 20K of config code hanging around the kernel. | |
872 | */ | |
873 | ||
874 | int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
875 | { | |
876 | struct sock *sk = sock->sk; | |
877 | int err = 0; | |
3b1e0a65 | 878 | struct net *net = sock_net(sk); |
1da177e4 LT |
879 | |
880 | switch (cmd) { | |
3d1427f8 ED |
881 | case SIOCGSTAMP: |
882 | err = sock_get_timestamp(sk, (struct timeval __user *)arg); | |
883 | break; | |
884 | case SIOCGSTAMPNS: | |
885 | err = sock_get_timestampns(sk, (struct timespec __user *)arg); | |
886 | break; | |
887 | case SIOCADDRT: | |
888 | case SIOCDELRT: | |
889 | case SIOCRTMSG: | |
890 | err = ip_rt_ioctl(net, cmd, (void __user *)arg); | |
891 | break; | |
892 | case SIOCDARP: | |
893 | case SIOCGARP: | |
894 | case SIOCSARP: | |
895 | err = arp_ioctl(net, cmd, (void __user *)arg); | |
896 | break; | |
897 | case SIOCGIFADDR: | |
898 | case SIOCSIFADDR: | |
899 | case SIOCGIFBRDADDR: | |
900 | case SIOCSIFBRDADDR: | |
901 | case SIOCGIFNETMASK: | |
902 | case SIOCSIFNETMASK: | |
903 | case SIOCGIFDSTADDR: | |
904 | case SIOCSIFDSTADDR: | |
905 | case SIOCSIFPFLAGS: | |
906 | case SIOCGIFPFLAGS: | |
907 | case SIOCSIFFLAGS: | |
908 | err = devinet_ioctl(net, cmd, (void __user *)arg); | |
909 | break; | |
910 | default: | |
911 | if (sk->sk_prot->ioctl) | |
912 | err = sk->sk_prot->ioctl(sk, cmd, arg); | |
913 | else | |
914 | err = -ENOIOCTLCMD; | |
915 | break; | |
1da177e4 LT |
916 | } |
917 | return err; | |
918 | } | |
3d1427f8 | 919 | EXPORT_SYMBOL(inet_ioctl); |
1da177e4 | 920 | |
709b46e8 | 921 | #ifdef CONFIG_COMPAT |
686dc6b6 | 922 | static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
709b46e8 EB |
923 | { |
924 | struct sock *sk = sock->sk; | |
925 | int err = -ENOIOCTLCMD; | |
926 | ||
927 | if (sk->sk_prot->compat_ioctl) | |
928 | err = sk->sk_prot->compat_ioctl(sk, cmd, arg); | |
929 | ||
930 | return err; | |
931 | } | |
932 | #endif | |
933 | ||
90ddc4f0 | 934 | const struct proto_ops inet_stream_ops = { |
543d9cfe ACM |
935 | .family = PF_INET, |
936 | .owner = THIS_MODULE, | |
937 | .release = inet_release, | |
938 | .bind = inet_bind, | |
939 | .connect = inet_stream_connect, | |
940 | .socketpair = sock_no_socketpair, | |
941 | .accept = inet_accept, | |
942 | .getname = inet_getname, | |
943 | .poll = tcp_poll, | |
944 | .ioctl = inet_ioctl, | |
945 | .listen = inet_listen, | |
946 | .shutdown = inet_shutdown, | |
947 | .setsockopt = sock_common_setsockopt, | |
948 | .getsockopt = sock_common_getsockopt, | |
7ba42910 | 949 | .sendmsg = inet_sendmsg, |
fec5e652 | 950 | .recvmsg = inet_recvmsg, |
543d9cfe | 951 | .mmap = sock_no_mmap, |
7ba42910 | 952 | .sendpage = inet_sendpage, |
9c55e01c | 953 | .splice_read = tcp_splice_read, |
3fdadf7d | 954 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
955 | .compat_setsockopt = compat_sock_common_setsockopt, |
956 | .compat_getsockopt = compat_sock_common_getsockopt, | |
709b46e8 | 957 | .compat_ioctl = inet_compat_ioctl, |
3fdadf7d | 958 | #endif |
1da177e4 | 959 | }; |
3d1427f8 | 960 | EXPORT_SYMBOL(inet_stream_ops); |
1da177e4 | 961 | |
90ddc4f0 | 962 | const struct proto_ops inet_dgram_ops = { |
543d9cfe ACM |
963 | .family = PF_INET, |
964 | .owner = THIS_MODULE, | |
965 | .release = inet_release, | |
966 | .bind = inet_bind, | |
967 | .connect = inet_dgram_connect, | |
968 | .socketpair = sock_no_socketpair, | |
969 | .accept = sock_no_accept, | |
970 | .getname = inet_getname, | |
971 | .poll = udp_poll, | |
972 | .ioctl = inet_ioctl, | |
973 | .listen = sock_no_listen, | |
974 | .shutdown = inet_shutdown, | |
975 | .setsockopt = sock_common_setsockopt, | |
976 | .getsockopt = sock_common_getsockopt, | |
977 | .sendmsg = inet_sendmsg, | |
fec5e652 | 978 | .recvmsg = inet_recvmsg, |
543d9cfe ACM |
979 | .mmap = sock_no_mmap, |
980 | .sendpage = inet_sendpage, | |
3fdadf7d | 981 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
982 | .compat_setsockopt = compat_sock_common_setsockopt, |
983 | .compat_getsockopt = compat_sock_common_getsockopt, | |
709b46e8 | 984 | .compat_ioctl = inet_compat_ioctl, |
3fdadf7d | 985 | #endif |
1da177e4 | 986 | }; |
3d1427f8 | 987 | EXPORT_SYMBOL(inet_dgram_ops); |
1da177e4 LT |
988 | |
989 | /* | |
990 | * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without | |
991 | * udp_poll | |
992 | */ | |
90ddc4f0 | 993 | static const struct proto_ops inet_sockraw_ops = { |
543d9cfe ACM |
994 | .family = PF_INET, |
995 | .owner = THIS_MODULE, | |
996 | .release = inet_release, | |
997 | .bind = inet_bind, | |
998 | .connect = inet_dgram_connect, | |
999 | .socketpair = sock_no_socketpair, | |
1000 | .accept = sock_no_accept, | |
1001 | .getname = inet_getname, | |
1002 | .poll = datagram_poll, | |
1003 | .ioctl = inet_ioctl, | |
1004 | .listen = sock_no_listen, | |
1005 | .shutdown = inet_shutdown, | |
1006 | .setsockopt = sock_common_setsockopt, | |
1007 | .getsockopt = sock_common_getsockopt, | |
1008 | .sendmsg = inet_sendmsg, | |
fec5e652 | 1009 | .recvmsg = inet_recvmsg, |
543d9cfe ACM |
1010 | .mmap = sock_no_mmap, |
1011 | .sendpage = inet_sendpage, | |
3fdadf7d | 1012 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1013 | .compat_setsockopt = compat_sock_common_setsockopt, |
1014 | .compat_getsockopt = compat_sock_common_getsockopt, | |
709b46e8 | 1015 | .compat_ioctl = inet_compat_ioctl, |
3fdadf7d | 1016 | #endif |
1da177e4 LT |
1017 | }; |
1018 | ||
ec1b4cf7 | 1019 | static const struct net_proto_family inet_family_ops = { |
1da177e4 LT |
1020 | .family = PF_INET, |
1021 | .create = inet_create, | |
1022 | .owner = THIS_MODULE, | |
1023 | }; | |
1024 | ||
1da177e4 LT |
1025 | /* Upon startup we insert all the elements in inetsw_array[] into |
1026 | * the linked list inetsw. | |
1027 | */ | |
1028 | static struct inet_protosw inetsw_array[] = | |
1029 | { | |
e905a9ed YH |
1030 | { |
1031 | .type = SOCK_STREAM, | |
1032 | .protocol = IPPROTO_TCP, | |
1033 | .prot = &tcp_prot, | |
1034 | .ops = &inet_stream_ops, | |
e905a9ed YH |
1035 | .no_check = 0, |
1036 | .flags = INET_PROTOSW_PERMANENT | | |
d83d8461 | 1037 | INET_PROTOSW_ICSK, |
e905a9ed YH |
1038 | }, |
1039 | ||
1040 | { | |
1041 | .type = SOCK_DGRAM, | |
1042 | .protocol = IPPROTO_UDP, | |
1043 | .prot = &udp_prot, | |
1044 | .ops = &inet_dgram_ops, | |
e905a9ed YH |
1045 | .no_check = UDP_CSUM_DEFAULT, |
1046 | .flags = INET_PROTOSW_PERMANENT, | |
1da177e4 | 1047 | }, |
e905a9ed | 1048 | |
c319b4d7 VK |
1049 | { |
1050 | .type = SOCK_DGRAM, | |
1051 | .protocol = IPPROTO_ICMP, | |
1052 | .prot = &ping_prot, | |
1053 | .ops = &inet_dgram_ops, | |
1054 | .no_check = UDP_CSUM_DEFAULT, | |
1055 | .flags = INET_PROTOSW_REUSE, | |
1056 | }, | |
1da177e4 LT |
1057 | |
1058 | { | |
e905a9ed YH |
1059 | .type = SOCK_RAW, |
1060 | .protocol = IPPROTO_IP, /* wild card */ | |
1061 | .prot = &raw_prot, | |
1062 | .ops = &inet_sockraw_ops, | |
e905a9ed YH |
1063 | .no_check = UDP_CSUM_DEFAULT, |
1064 | .flags = INET_PROTOSW_REUSE, | |
1da177e4 LT |
1065 | } |
1066 | }; | |
1067 | ||
c40f6fff | 1068 | #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) |
1da177e4 LT |
1069 | |
1070 | void inet_register_protosw(struct inet_protosw *p) | |
1071 | { | |
1072 | struct list_head *lh; | |
1073 | struct inet_protosw *answer; | |
1074 | int protocol = p->protocol; | |
1075 | struct list_head *last_perm; | |
1076 | ||
1077 | spin_lock_bh(&inetsw_lock); | |
1078 | ||
1079 | if (p->type >= SOCK_MAX) | |
1080 | goto out_illegal; | |
1081 | ||
1082 | /* If we are trying to override a permanent protocol, bail. */ | |
1083 | answer = NULL; | |
1084 | last_perm = &inetsw[p->type]; | |
1085 | list_for_each(lh, &inetsw[p->type]) { | |
1086 | answer = list_entry(lh, struct inet_protosw, list); | |
1087 | ||
1088 | /* Check only the non-wild match. */ | |
1089 | if (INET_PROTOSW_PERMANENT & answer->flags) { | |
1090 | if (protocol == answer->protocol) | |
1091 | break; | |
1092 | last_perm = lh; | |
1093 | } | |
1094 | ||
1095 | answer = NULL; | |
1096 | } | |
1097 | if (answer) | |
1098 | goto out_permanent; | |
1099 | ||
1100 | /* Add the new entry after the last permanent entry if any, so that | |
1101 | * the new entry does not override a permanent entry when matched with | |
1102 | * a wild-card protocol. But it is allowed to override any existing | |
e905a9ed | 1103 | * non-permanent entry. This means that when we remove this entry, the |
1da177e4 LT |
1104 | * system automatically returns to the old behavior. |
1105 | */ | |
1106 | list_add_rcu(&p->list, last_perm); | |
1107 | out: | |
1108 | spin_unlock_bh(&inetsw_lock); | |
1109 | ||
1da177e4 LT |
1110 | return; |
1111 | ||
1112 | out_permanent: | |
058bd4d2 | 1113 | pr_err("Attempt to override permanent protocol %d\n", protocol); |
1da177e4 LT |
1114 | goto out; |
1115 | ||
1116 | out_illegal: | |
058bd4d2 | 1117 | pr_err("Ignoring attempt to register invalid socket type %d\n", |
1da177e4 LT |
1118 | p->type); |
1119 | goto out; | |
1120 | } | |
3d1427f8 | 1121 | EXPORT_SYMBOL(inet_register_protosw); |
1da177e4 LT |
1122 | |
1123 | void inet_unregister_protosw(struct inet_protosw *p) | |
1124 | { | |
1125 | if (INET_PROTOSW_PERMANENT & p->flags) { | |
058bd4d2 | 1126 | pr_err("Attempt to unregister permanent protocol %d\n", |
1da177e4 LT |
1127 | p->protocol); |
1128 | } else { | |
1129 | spin_lock_bh(&inetsw_lock); | |
1130 | list_del_rcu(&p->list); | |
1131 | spin_unlock_bh(&inetsw_lock); | |
1132 | ||
1133 | synchronize_net(); | |
1134 | } | |
1135 | } | |
3d1427f8 | 1136 | EXPORT_SYMBOL(inet_unregister_protosw); |
1da177e4 | 1137 | |
32519f11 ACM |
1138 | /* |
1139 | * Shall we try to damage output packets if routing dev changes? | |
1140 | */ | |
1141 | ||
ab32ea5d | 1142 | int sysctl_ip_dynaddr __read_mostly; |
32519f11 ACM |
1143 | |
1144 | static int inet_sk_reselect_saddr(struct sock *sk) | |
1145 | { | |
1146 | struct inet_sock *inet = inet_sk(sk); | |
c720c7e8 | 1147 | __be32 old_saddr = inet->inet_saddr; |
c720c7e8 | 1148 | __be32 daddr = inet->inet_daddr; |
6e869138 | 1149 | struct flowi4 *fl4; |
b23dd4fe DM |
1150 | struct rtable *rt; |
1151 | __be32 new_saddr; | |
f6d8bd05 | 1152 | struct ip_options_rcu *inet_opt; |
32519f11 | 1153 | |
f6d8bd05 ED |
1154 | inet_opt = rcu_dereference_protected(inet->inet_opt, |
1155 | sock_owned_by_user(sk)); | |
1156 | if (inet_opt && inet_opt->opt.srr) | |
1157 | daddr = inet_opt->opt.faddr; | |
32519f11 ACM |
1158 | |
1159 | /* Query new route. */ | |
6e869138 DM |
1160 | fl4 = &inet->cork.fl.u.ip4; |
1161 | rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), | |
b23dd4fe DM |
1162 | sk->sk_bound_dev_if, sk->sk_protocol, |
1163 | inet->inet_sport, inet->inet_dport, sk, false); | |
1164 | if (IS_ERR(rt)) | |
1165 | return PTR_ERR(rt); | |
32519f11 | 1166 | |
d8d1f30b | 1167 | sk_setup_caps(sk, &rt->dst); |
32519f11 | 1168 | |
6e869138 | 1169 | new_saddr = fl4->saddr; |
32519f11 ACM |
1170 | |
1171 | if (new_saddr == old_saddr) | |
1172 | return 0; | |
1173 | ||
1174 | if (sysctl_ip_dynaddr > 1) { | |
058bd4d2 JP |
1175 | pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", |
1176 | __func__, &old_saddr, &new_saddr); | |
32519f11 ACM |
1177 | } |
1178 | ||
c720c7e8 | 1179 | inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; |
32519f11 ACM |
1180 | |
1181 | /* | |
1182 | * XXX The only one ugly spot where we need to | |
1183 | * XXX really change the sockets identity after | |
1184 | * XXX it has entered the hashes. -DaveM | |
1185 | * | |
1186 | * Besides that, it does not check for connection | |
1187 | * uniqueness. Wait for troubles. | |
1188 | */ | |
1189 | __sk_prot_rehash(sk); | |
1190 | return 0; | |
1191 | } | |
1192 | ||
1193 | int inet_sk_rebuild_header(struct sock *sk) | |
1194 | { | |
1195 | struct inet_sock *inet = inet_sk(sk); | |
1196 | struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); | |
3ca3c68e | 1197 | __be32 daddr; |
f6d8bd05 | 1198 | struct ip_options_rcu *inet_opt; |
6e869138 | 1199 | struct flowi4 *fl4; |
32519f11 ACM |
1200 | int err; |
1201 | ||
1202 | /* Route is OK, nothing to do. */ | |
1203 | if (rt) | |
1204 | return 0; | |
1205 | ||
1206 | /* Reroute. */ | |
f6d8bd05 ED |
1207 | rcu_read_lock(); |
1208 | inet_opt = rcu_dereference(inet->inet_opt); | |
c720c7e8 | 1209 | daddr = inet->inet_daddr; |
f6d8bd05 ED |
1210 | if (inet_opt && inet_opt->opt.srr) |
1211 | daddr = inet_opt->opt.faddr; | |
1212 | rcu_read_unlock(); | |
6e869138 DM |
1213 | fl4 = &inet->cork.fl.u.ip4; |
1214 | rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, | |
78fbfd8a DM |
1215 | inet->inet_dport, inet->inet_sport, |
1216 | sk->sk_protocol, RT_CONN_FLAGS(sk), | |
1217 | sk->sk_bound_dev_if); | |
b23dd4fe DM |
1218 | if (!IS_ERR(rt)) { |
1219 | err = 0; | |
d8d1f30b | 1220 | sk_setup_caps(sk, &rt->dst); |
b23dd4fe DM |
1221 | } else { |
1222 | err = PTR_ERR(rt); | |
1223 | ||
32519f11 ACM |
1224 | /* Routing failed... */ |
1225 | sk->sk_route_caps = 0; | |
1226 | /* | |
1227 | * Other protocols have to map its equivalent state to TCP_SYN_SENT. | |
1228 | * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme | |
1229 | */ | |
1230 | if (!sysctl_ip_dynaddr || | |
1231 | sk->sk_state != TCP_SYN_SENT || | |
1232 | (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || | |
1233 | (err = inet_sk_reselect_saddr(sk)) != 0) | |
1234 | sk->sk_err_soft = -err; | |
1235 | } | |
1236 | ||
1237 | return err; | |
1238 | } | |
32519f11 ACM |
1239 | EXPORT_SYMBOL(inet_sk_rebuild_header); |
1240 | ||
a430a43d HX |
1241 | static int inet_gso_send_check(struct sk_buff *skb) |
1242 | { | |
bca49f84 | 1243 | const struct net_offload *ops; |
f9242b6b | 1244 | const struct iphdr *iph; |
a430a43d HX |
1245 | int proto; |
1246 | int ihl; | |
1247 | int err = -EINVAL; | |
1248 | ||
1249 | if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) | |
1250 | goto out; | |
1251 | ||
eddc9ec5 | 1252 | iph = ip_hdr(skb); |
a430a43d HX |
1253 | ihl = iph->ihl * 4; |
1254 | if (ihl < sizeof(*iph)) | |
1255 | goto out; | |
1256 | ||
1257 | if (unlikely(!pskb_may_pull(skb, ihl))) | |
1258 | goto out; | |
1259 | ||
badff6d0 ACM |
1260 | __skb_pull(skb, ihl); |
1261 | skb_reset_transport_header(skb); | |
eddc9ec5 | 1262 | iph = ip_hdr(skb); |
f9242b6b | 1263 | proto = iph->protocol; |
a430a43d HX |
1264 | err = -EPROTONOSUPPORT; |
1265 | ||
1266 | rcu_read_lock(); | |
bca49f84 | 1267 | ops = rcu_dereference(inet_offloads[proto]); |
f191a1d1 VY |
1268 | if (likely(ops && ops->callbacks.gso_send_check)) |
1269 | err = ops->callbacks.gso_send_check(skb); | |
a430a43d HX |
1270 | rcu_read_unlock(); |
1271 | ||
1272 | out: | |
1273 | return err; | |
1274 | } | |
1275 | ||
c8f44aff MM |
1276 | static struct sk_buff *inet_gso_segment(struct sk_buff *skb, |
1277 | netdev_features_t features) | |
f4c50d99 HX |
1278 | { |
1279 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
bca49f84 | 1280 | const struct net_offload *ops; |
f9242b6b | 1281 | struct iphdr *iph; |
f4c50d99 HX |
1282 | int proto; |
1283 | int ihl; | |
1284 | int id; | |
d7ca4cc0 | 1285 | unsigned int offset = 0; |
73136267 | 1286 | bool tunnel; |
f4c50d99 | 1287 | |
bbcf467d HX |
1288 | if (unlikely(skb_shinfo(skb)->gso_type & |
1289 | ~(SKB_GSO_TCPV4 | | |
1290 | SKB_GSO_UDP | | |
1291 | SKB_GSO_DODGY | | |
1292 | SKB_GSO_TCP_ECN | | |
68c33163 | 1293 | SKB_GSO_GRE | |
9b3eb5ed | 1294 | SKB_GSO_TCPV6 | |
73136267 | 1295 | SKB_GSO_UDP_TUNNEL | |
0d89d203 | 1296 | SKB_GSO_MPLS | |
bbcf467d HX |
1297 | 0))) |
1298 | goto out; | |
1299 | ||
1300 | if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) | |
f4c50d99 HX |
1301 | goto out; |
1302 | ||
eddc9ec5 | 1303 | iph = ip_hdr(skb); |
f4c50d99 HX |
1304 | ihl = iph->ihl * 4; |
1305 | if (ihl < sizeof(*iph)) | |
1306 | goto out; | |
1307 | ||
bbcf467d | 1308 | if (unlikely(!pskb_may_pull(skb, ihl))) |
f4c50d99 HX |
1309 | goto out; |
1310 | ||
73136267 PS |
1311 | tunnel = !!skb->encapsulation; |
1312 | ||
badff6d0 ACM |
1313 | __skb_pull(skb, ihl); |
1314 | skb_reset_transport_header(skb); | |
eddc9ec5 | 1315 | iph = ip_hdr(skb); |
f4c50d99 | 1316 | id = ntohs(iph->id); |
f9242b6b | 1317 | proto = iph->protocol; |
f4c50d99 HX |
1318 | segs = ERR_PTR(-EPROTONOSUPPORT); |
1319 | ||
1320 | rcu_read_lock(); | |
bca49f84 | 1321 | ops = rcu_dereference(inet_offloads[proto]); |
f191a1d1 VY |
1322 | if (likely(ops && ops->callbacks.gso_segment)) |
1323 | segs = ops->callbacks.gso_segment(skb, features); | |
f4c50d99 HX |
1324 | rcu_read_unlock(); |
1325 | ||
50c3a487 | 1326 | if (IS_ERR_OR_NULL(segs)) |
f4c50d99 HX |
1327 | goto out; |
1328 | ||
1329 | skb = segs; | |
1330 | do { | |
eddc9ec5 | 1331 | iph = ip_hdr(skb); |
73136267 | 1332 | if (!tunnel && proto == IPPROTO_UDP) { |
d7ca4cc0 SS |
1333 | iph->id = htons(id); |
1334 | iph->frag_off = htons(offset >> 3); | |
1335 | if (skb->next != NULL) | |
1336 | iph->frag_off |= htons(IP_MF); | |
1337 | offset += (skb->len - skb->mac_len - iph->ihl * 4); | |
490ab081 | 1338 | } else { |
25c7704d | 1339 | iph->id = htons(id++); |
490ab081 | 1340 | } |
f4c50d99 HX |
1341 | iph->tot_len = htons(skb->len - skb->mac_len); |
1342 | iph->check = 0; | |
d56f90a7 | 1343 | iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); |
f4c50d99 HX |
1344 | } while ((skb = skb->next)); |
1345 | ||
1346 | out: | |
1347 | return segs; | |
1348 | } | |
1349 | ||
73cc19f1 HX |
1350 | static struct sk_buff **inet_gro_receive(struct sk_buff **head, |
1351 | struct sk_buff *skb) | |
1352 | { | |
bca49f84 | 1353 | const struct net_offload *ops; |
73cc19f1 HX |
1354 | struct sk_buff **pp = NULL; |
1355 | struct sk_buff *p; | |
b71d1d42 | 1356 | const struct iphdr *iph; |
a5b1cf28 HX |
1357 | unsigned int hlen; |
1358 | unsigned int off; | |
1075f3f6 | 1359 | unsigned int id; |
73cc19f1 HX |
1360 | int flush = 1; |
1361 | int proto; | |
73cc19f1 | 1362 | |
a5b1cf28 HX |
1363 | off = skb_gro_offset(skb); |
1364 | hlen = off + sizeof(*iph); | |
1365 | iph = skb_gro_header_fast(skb, off); | |
1366 | if (skb_gro_header_hard(skb, hlen)) { | |
1367 | iph = skb_gro_header_slow(skb, hlen, off); | |
1368 | if (unlikely(!iph)) | |
1369 | goto out; | |
1370 | } | |
73cc19f1 | 1371 | |
f9242b6b | 1372 | proto = iph->protocol; |
73cc19f1 HX |
1373 | |
1374 | rcu_read_lock(); | |
bca49f84 | 1375 | ops = rcu_dereference(inet_offloads[proto]); |
f191a1d1 | 1376 | if (!ops || !ops->callbacks.gro_receive) |
73cc19f1 HX |
1377 | goto out_unlock; |
1378 | ||
a5ad24be | 1379 | if (*(u8 *)iph != 0x45) |
73cc19f1 HX |
1380 | goto out_unlock; |
1381 | ||
a9e050f4 | 1382 | if (unlikely(ip_fast_csum((u8 *)iph, 5))) |
73cc19f1 HX |
1383 | goto out_unlock; |
1384 | ||
0eae88f3 | 1385 | id = ntohl(*(__be32 *)&iph->id); |
db8caf3d | 1386 | flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); |
1075f3f6 | 1387 | id >>= 16; |
73cc19f1 HX |
1388 | |
1389 | for (p = *head; p; p = p->next) { | |
1390 | struct iphdr *iph2; | |
1391 | ||
1392 | if (!NAPI_GRO_CB(p)->same_flow) | |
1393 | continue; | |
1394 | ||
1395 | iph2 = ip_hdr(p); | |
1396 | ||
a5ad24be | 1397 | if ((iph->protocol ^ iph2->protocol) | |
0eae88f3 ED |
1398 | ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | |
1399 | ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { | |
73cc19f1 HX |
1400 | NAPI_GRO_CB(p)->same_flow = 0; |
1401 | continue; | |
1402 | } | |
1403 | ||
1404 | /* All fields must match except length and checksum. */ | |
1405 | NAPI_GRO_CB(p)->flush |= | |
a5ad24be | 1406 | (iph->ttl ^ iph2->ttl) | |
a9e050f4 | 1407 | (iph->tos ^ iph2->tos) | |
5b9b6263 | 1408 | (__force int)((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)) | |
a5ad24be | 1409 | ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); |
73cc19f1 HX |
1410 | |
1411 | NAPI_GRO_CB(p)->flush |= flush; | |
1412 | } | |
1413 | ||
1414 | NAPI_GRO_CB(skb)->flush |= flush; | |
86911732 HX |
1415 | skb_gro_pull(skb, sizeof(*iph)); |
1416 | skb_set_transport_header(skb, skb_gro_offset(skb)); | |
73cc19f1 | 1417 | |
f191a1d1 | 1418 | pp = ops->callbacks.gro_receive(head, skb); |
73cc19f1 HX |
1419 | |
1420 | out_unlock: | |
1421 | rcu_read_unlock(); | |
1422 | ||
1423 | out: | |
1424 | NAPI_GRO_CB(skb)->flush |= flush; | |
1425 | ||
1426 | return pp; | |
1427 | } | |
1428 | ||
1429 | static int inet_gro_complete(struct sk_buff *skb) | |
1430 | { | |
f9242b6b | 1431 | __be16 newlen = htons(skb->len - skb_network_offset(skb)); |
73cc19f1 | 1432 | struct iphdr *iph = ip_hdr(skb); |
bca49f84 | 1433 | const struct net_offload *ops; |
f9242b6b | 1434 | int proto = iph->protocol; |
73cc19f1 | 1435 | int err = -ENOSYS; |
73cc19f1 HX |
1436 | |
1437 | csum_replace2(&iph->check, iph->tot_len, newlen); | |
1438 | iph->tot_len = newlen; | |
1439 | ||
1440 | rcu_read_lock(); | |
bca49f84 | 1441 | ops = rcu_dereference(inet_offloads[proto]); |
f191a1d1 | 1442 | if (WARN_ON(!ops || !ops->callbacks.gro_complete)) |
73cc19f1 HX |
1443 | goto out_unlock; |
1444 | ||
f191a1d1 | 1445 | err = ops->callbacks.gro_complete(skb); |
73cc19f1 HX |
1446 | |
1447 | out_unlock: | |
1448 | rcu_read_unlock(); | |
1449 | ||
1450 | return err; | |
1451 | } | |
1452 | ||
eee4fe4d | 1453 | int inet_ctl_sock_create(struct sock **sk, unsigned short family, |
5677242f DL |
1454 | unsigned short type, unsigned char protocol, |
1455 | struct net *net) | |
3d58b5fa | 1456 | { |
eee4fe4d DL |
1457 | struct socket *sock; |
1458 | int rc = sock_create_kern(family, type, protocol, &sock); | |
3d58b5fa DL |
1459 | |
1460 | if (rc == 0) { | |
eee4fe4d DL |
1461 | *sk = sock->sk; |
1462 | (*sk)->sk_allocation = GFP_ATOMIC; | |
3d58b5fa DL |
1463 | /* |
1464 | * Unhash it so that IP input processing does not even see it, | |
1465 | * we do not wish this socket to see incoming packets. | |
1466 | */ | |
eee4fe4d | 1467 | (*sk)->sk_prot->unhash(*sk); |
5677242f DL |
1468 | |
1469 | sk_change_net(*sk, net); | |
3d58b5fa DL |
1470 | } |
1471 | return rc; | |
1472 | } | |
3d58b5fa DL |
1473 | EXPORT_SYMBOL_GPL(inet_ctl_sock_create); |
1474 | ||
7d720c3e | 1475 | unsigned long snmp_fold_field(void __percpu *mib[], int offt) |
5e0f0435 HX |
1476 | { |
1477 | unsigned long res = 0; | |
8f0ea0fe | 1478 | int i, j; |
5e0f0435 HX |
1479 | |
1480 | for_each_possible_cpu(i) { | |
8f0ea0fe ED |
1481 | for (j = 0; j < SNMP_ARRAY_SZ; j++) |
1482 | res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt); | |
5e0f0435 HX |
1483 | } |
1484 | return res; | |
1485 | } | |
1486 | EXPORT_SYMBOL_GPL(snmp_fold_field); | |
1487 | ||
4ce3c183 ED |
1488 | #if BITS_PER_LONG==32 |
1489 | ||
1490 | u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset) | |
1491 | { | |
1492 | u64 res = 0; | |
1493 | int cpu; | |
1494 | ||
1495 | for_each_possible_cpu(cpu) { | |
8f0ea0fe | 1496 | void *bhptr; |
4ce3c183 | 1497 | struct u64_stats_sync *syncp; |
8f0ea0fe | 1498 | u64 v; |
4ce3c183 ED |
1499 | unsigned int start; |
1500 | ||
8f0ea0fe | 1501 | bhptr = per_cpu_ptr(mib[0], cpu); |
4ce3c183 ED |
1502 | syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); |
1503 | do { | |
1504 | start = u64_stats_fetch_begin_bh(syncp); | |
8f0ea0fe | 1505 | v = *(((u64 *) bhptr) + offt); |
4ce3c183 ED |
1506 | } while (u64_stats_fetch_retry_bh(syncp, start)); |
1507 | ||
8f0ea0fe | 1508 | res += v; |
4ce3c183 ED |
1509 | } |
1510 | return res; | |
1511 | } | |
1512 | EXPORT_SYMBOL_GPL(snmp_fold_field64); | |
1513 | #endif | |
1514 | ||
1823e4c8 | 1515 | int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align) |
5e0f0435 HX |
1516 | { |
1517 | BUG_ON(ptr == NULL); | |
1823e4c8 | 1518 | ptr[0] = __alloc_percpu(mibsize, align); |
5e0f0435 | 1519 | if (!ptr[0]) |
8f0ea0fe ED |
1520 | return -ENOMEM; |
1521 | #if SNMP_ARRAY_SZ == 2 | |
1823e4c8 | 1522 | ptr[1] = __alloc_percpu(mibsize, align); |
8f0ea0fe ED |
1523 | if (!ptr[1]) { |
1524 | free_percpu(ptr[0]); | |
1525 | ptr[0] = NULL; | |
1526 | return -ENOMEM; | |
1527 | } | |
1528 | #endif | |
5e0f0435 | 1529 | return 0; |
5e0f0435 HX |
1530 | } |
1531 | EXPORT_SYMBOL_GPL(snmp_mib_init); | |
1532 | ||
1da177e4 | 1533 | #ifdef CONFIG_IP_MULTICAST |
32613090 | 1534 | static const struct net_protocol igmp_protocol = { |
1da177e4 | 1535 | .handler = igmp_rcv, |
b4ee07df | 1536 | .netns_ok = 1, |
1da177e4 LT |
1537 | }; |
1538 | #endif | |
1539 | ||
32613090 | 1540 | static const struct net_protocol tcp_protocol = { |
41063e9d DM |
1541 | .early_demux = tcp_v4_early_demux, |
1542 | .handler = tcp_v4_rcv, | |
1543 | .err_handler = tcp_v4_err, | |
41063e9d DM |
1544 | .no_policy = 1, |
1545 | .netns_ok = 1, | |
1da177e4 LT |
1546 | }; |
1547 | ||
32613090 | 1548 | static const struct net_protocol udp_protocol = { |
1da177e4 LT |
1549 | .handler = udp_rcv, |
1550 | .err_handler = udp_err, | |
1551 | .no_policy = 1, | |
92f1fecb | 1552 | .netns_ok = 1, |
1da177e4 LT |
1553 | }; |
1554 | ||
32613090 | 1555 | static const struct net_protocol icmp_protocol = { |
1da177e4 | 1556 | .handler = icmp_rcv, |
5b052042 | 1557 | .err_handler = icmp_err, |
8b7817f3 | 1558 | .no_policy = 1, |
92f1fecb | 1559 | .netns_ok = 1, |
1da177e4 LT |
1560 | }; |
1561 | ||
9b4661bd PE |
1562 | static __net_init int ipv4_mib_init_net(struct net *net) |
1563 | { | |
7d720c3e | 1564 | if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, |
1823e4c8 ED |
1565 | sizeof(struct tcp_mib), |
1566 | __alignof__(struct tcp_mib)) < 0) | |
57ef42d5 | 1567 | goto err_tcp_mib; |
7d720c3e | 1568 | if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, |
1823e4c8 ED |
1569 | sizeof(struct ipstats_mib), |
1570 | __alignof__(struct ipstats_mib)) < 0) | |
a20f5799 | 1571 | goto err_ip_mib; |
7d720c3e | 1572 | if (snmp_mib_init((void __percpu **)net->mib.net_statistics, |
1823e4c8 ED |
1573 | sizeof(struct linux_mib), |
1574 | __alignof__(struct linux_mib)) < 0) | |
61a7e260 | 1575 | goto err_net_mib; |
7d720c3e | 1576 | if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, |
1823e4c8 ED |
1577 | sizeof(struct udp_mib), |
1578 | __alignof__(struct udp_mib)) < 0) | |
2f275f91 | 1579 | goto err_udp_mib; |
7d720c3e | 1580 | if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, |
1823e4c8 ED |
1581 | sizeof(struct udp_mib), |
1582 | __alignof__(struct udp_mib)) < 0) | |
386019d3 | 1583 | goto err_udplite_mib; |
7d720c3e | 1584 | if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, |
1823e4c8 ED |
1585 | sizeof(struct icmp_mib), |
1586 | __alignof__(struct icmp_mib)) < 0) | |
b60538a0 | 1587 | goto err_icmp_mib; |
acb32ba3 ED |
1588 | net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), |
1589 | GFP_KERNEL); | |
1590 | if (!net->mib.icmpmsg_statistics) | |
923c6586 | 1591 | goto err_icmpmsg_mib; |
57ef42d5 PE |
1592 | |
1593 | tcp_mib_init(net); | |
9b4661bd | 1594 | return 0; |
57ef42d5 | 1595 | |
923c6586 | 1596 | err_icmpmsg_mib: |
7d720c3e | 1597 | snmp_mib_free((void __percpu **)net->mib.icmp_statistics); |
b60538a0 | 1598 | err_icmp_mib: |
7d720c3e | 1599 | snmp_mib_free((void __percpu **)net->mib.udplite_statistics); |
386019d3 | 1600 | err_udplite_mib: |
7d720c3e | 1601 | snmp_mib_free((void __percpu **)net->mib.udp_statistics); |
2f275f91 | 1602 | err_udp_mib: |
7d720c3e | 1603 | snmp_mib_free((void __percpu **)net->mib.net_statistics); |
61a7e260 | 1604 | err_net_mib: |
7d720c3e | 1605 | snmp_mib_free((void __percpu **)net->mib.ip_statistics); |
a20f5799 | 1606 | err_ip_mib: |
7d720c3e | 1607 | snmp_mib_free((void __percpu **)net->mib.tcp_statistics); |
57ef42d5 PE |
1608 | err_tcp_mib: |
1609 | return -ENOMEM; | |
9b4661bd PE |
1610 | } |
1611 | ||
1612 | static __net_exit void ipv4_mib_exit_net(struct net *net) | |
1613 | { | |
acb32ba3 | 1614 | kfree(net->mib.icmpmsg_statistics); |
7d720c3e TH |
1615 | snmp_mib_free((void __percpu **)net->mib.icmp_statistics); |
1616 | snmp_mib_free((void __percpu **)net->mib.udplite_statistics); | |
1617 | snmp_mib_free((void __percpu **)net->mib.udp_statistics); | |
1618 | snmp_mib_free((void __percpu **)net->mib.net_statistics); | |
1619 | snmp_mib_free((void __percpu **)net->mib.ip_statistics); | |
1620 | snmp_mib_free((void __percpu **)net->mib.tcp_statistics); | |
9b4661bd PE |
1621 | } |
1622 | ||
1623 | static __net_initdata struct pernet_operations ipv4_mib_ops = { | |
1624 | .init = ipv4_mib_init_net, | |
1625 | .exit = ipv4_mib_exit_net, | |
1626 | }; | |
1627 | ||
1da177e4 LT |
1628 | static int __init init_ipv4_mibs(void) |
1629 | { | |
d89cbbb1 | 1630 | return register_pernet_subsys(&ipv4_mib_ops); |
1da177e4 LT |
1631 | } |
1632 | ||
1633 | static int ipv4_proc_init(void); | |
1da177e4 | 1634 | |
30e224d7 HX |
1635 | /* |
1636 | * IP protocol layer initialiser | |
1637 | */ | |
1638 | ||
22061d80 VY |
1639 | static struct packet_offload ip_packet_offload __read_mostly = { |
1640 | .type = cpu_to_be16(ETH_P_IP), | |
f191a1d1 VY |
1641 | .callbacks = { |
1642 | .gso_send_check = inet_gso_send_check, | |
1643 | .gso_segment = inet_gso_segment, | |
1644 | .gro_receive = inet_gro_receive, | |
1645 | .gro_complete = inet_gro_complete, | |
1646 | }, | |
30e224d7 HX |
1647 | }; |
1648 | ||
808a8f88 VY |
1649 | static int __init ipv4_offload_init(void) |
1650 | { | |
1651 | /* | |
1652 | * Add offloads | |
1653 | */ | |
da5bab07 | 1654 | if (udpv4_offload_init() < 0) |
808a8f88 | 1655 | pr_crit("%s: Cannot add UDP protocol offload\n", __func__); |
28850dc7 DB |
1656 | if (tcpv4_offload_init() < 0) |
1657 | pr_crit("%s: Cannot add TCP protocol offload\n", __func__); | |
808a8f88 VY |
1658 | |
1659 | dev_add_offload(&ip_packet_offload); | |
1660 | return 0; | |
1661 | } | |
1662 | ||
1663 | fs_initcall(ipv4_offload_init); | |
1664 | ||
1665 | static struct packet_type ip_packet_type __read_mostly = { | |
1666 | .type = cpu_to_be16(ETH_P_IP), | |
1667 | .func = ip_rcv, | |
1668 | }; | |
1669 | ||
1da177e4 LT |
1670 | static int __init inet_init(void) |
1671 | { | |
1da177e4 LT |
1672 | struct inet_protosw *q; |
1673 | struct list_head *r; | |
1674 | int rc = -EINVAL; | |
1675 | ||
95c7e0e4 | 1676 | BUILD_BUG_ON(sizeof(struct inet_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb)); |
1da177e4 | 1677 | |
e3826f1e AW |
1678 | sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); |
1679 | if (!sysctl_local_reserved_ports) | |
1680 | goto out; | |
1681 | ||
1da177e4 LT |
1682 | rc = proto_register(&tcp_prot, 1); |
1683 | if (rc) | |
e3826f1e | 1684 | goto out_free_reserved_ports; |
1da177e4 LT |
1685 | |
1686 | rc = proto_register(&udp_prot, 1); | |
1687 | if (rc) | |
1688 | goto out_unregister_tcp_proto; | |
1689 | ||
1690 | rc = proto_register(&raw_prot, 1); | |
1691 | if (rc) | |
1692 | goto out_unregister_udp_proto; | |
1693 | ||
c319b4d7 VK |
1694 | rc = proto_register(&ping_prot, 1); |
1695 | if (rc) | |
1696 | goto out_unregister_raw_proto; | |
1697 | ||
1da177e4 | 1698 | /* |
e905a9ed | 1699 | * Tell SOCKET that we are alive... |
1da177e4 LT |
1700 | */ |
1701 | ||
e905a9ed | 1702 | (void)sock_register(&inet_family_ops); |
1da177e4 | 1703 | |
bd7b1533 AV |
1704 | #ifdef CONFIG_SYSCTL |
1705 | ip_static_sysctl_init(); | |
1706 | #endif | |
1707 | ||
3dc43e3e GC |
1708 | tcp_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem; |
1709 | ||
1da177e4 LT |
1710 | /* |
1711 | * Add all the base protocols. | |
1712 | */ | |
1713 | ||
1714 | if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) | |
058bd4d2 | 1715 | pr_crit("%s: Cannot add ICMP protocol\n", __func__); |
1da177e4 | 1716 | if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) |
058bd4d2 | 1717 | pr_crit("%s: Cannot add UDP protocol\n", __func__); |
1da177e4 | 1718 | if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) |
058bd4d2 | 1719 | pr_crit("%s: Cannot add TCP protocol\n", __func__); |
1da177e4 LT |
1720 | #ifdef CONFIG_IP_MULTICAST |
1721 | if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) | |
058bd4d2 | 1722 | pr_crit("%s: Cannot add IGMP protocol\n", __func__); |
1da177e4 LT |
1723 | #endif |
1724 | ||
1725 | /* Register the socket-side information for inet_create. */ | |
1726 | for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) | |
1727 | INIT_LIST_HEAD(r); | |
1728 | ||
1729 | for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) | |
1730 | inet_register_protosw(q); | |
1731 | ||
1732 | /* | |
1733 | * Set the ARP module up | |
1734 | */ | |
1735 | ||
1736 | arp_init(); | |
1737 | ||
e905a9ed YH |
1738 | /* |
1739 | * Set the IP module up | |
1740 | */ | |
1da177e4 LT |
1741 | |
1742 | ip_init(); | |
1743 | ||
9b0f976f | 1744 | tcp_v4_init(); |
1da177e4 LT |
1745 | |
1746 | /* Setup TCP slab cache for open requests. */ | |
1747 | tcp_init(); | |
1748 | ||
95766fff HA |
1749 | /* Setup UDP memory threshold */ |
1750 | udp_init(); | |
1751 | ||
ba4e58ec GR |
1752 | /* Add UDP-Lite (RFC 3828) */ |
1753 | udplite4_register(); | |
1da177e4 | 1754 | |
c319b4d7 VK |
1755 | ping_init(); |
1756 | ||
1da177e4 LT |
1757 | /* |
1758 | * Set the ICMP layer up | |
1759 | */ | |
1760 | ||
a5710d65 DL |
1761 | if (icmp_init() < 0) |
1762 | panic("Failed to create the ICMP control socket.\n"); | |
1da177e4 LT |
1763 | |
1764 | /* | |
1765 | * Initialise the multicast router | |
1766 | */ | |
1767 | #if defined(CONFIG_IP_MROUTE) | |
03d2f897 | 1768 | if (ip_mr_init()) |
058bd4d2 | 1769 | pr_crit("%s: Cannot init ipv4 mroute\n", __func__); |
1da177e4 LT |
1770 | #endif |
1771 | /* | |
1772 | * Initialise per-cpu ipv4 mibs | |
e905a9ed | 1773 | */ |
1da177e4 | 1774 | |
132adf54 | 1775 | if (init_ipv4_mibs()) |
058bd4d2 | 1776 | pr_crit("%s: Cannot init ipv4 mibs\n", __func__); |
e905a9ed | 1777 | |
1da177e4 LT |
1778 | ipv4_proc_init(); |
1779 | ||
1780 | ipfrag_init(); | |
1781 | ||
30e224d7 HX |
1782 | dev_add_pack(&ip_packet_type); |
1783 | ||
1da177e4 LT |
1784 | rc = 0; |
1785 | out: | |
1786 | return rc; | |
c319b4d7 VK |
1787 | out_unregister_raw_proto: |
1788 | proto_unregister(&raw_prot); | |
1da177e4 LT |
1789 | out_unregister_udp_proto: |
1790 | proto_unregister(&udp_prot); | |
321efff7 OK |
1791 | out_unregister_tcp_proto: |
1792 | proto_unregister(&tcp_prot); | |
e3826f1e AW |
1793 | out_free_reserved_ports: |
1794 | kfree(sysctl_local_reserved_ports); | |
1da177e4 LT |
1795 | goto out; |
1796 | } | |
1797 | ||
a536e077 | 1798 | fs_initcall(inet_init); |
1da177e4 LT |
1799 | |
1800 | /* ------------------------------------------------------------------------ */ | |
1801 | ||
1802 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
1803 | static int __init ipv4_proc_init(void) |
1804 | { | |
1805 | int rc = 0; | |
1806 | ||
1807 | if (raw_proc_init()) | |
1808 | goto out_raw; | |
1809 | if (tcp4_proc_init()) | |
1810 | goto out_tcp; | |
1811 | if (udp4_proc_init()) | |
1812 | goto out_udp; | |
c319b4d7 VK |
1813 | if (ping_proc_init()) |
1814 | goto out_ping; | |
1da177e4 LT |
1815 | if (ip_misc_proc_init()) |
1816 | goto out_misc; | |
1817 | out: | |
1818 | return rc; | |
1819 | out_misc: | |
c319b4d7 VK |
1820 | ping_proc_exit(); |
1821 | out_ping: | |
1da177e4 LT |
1822 | udp4_proc_exit(); |
1823 | out_udp: | |
1824 | tcp4_proc_exit(); | |
1825 | out_tcp: | |
1826 | raw_proc_exit(); | |
1827 | out_raw: | |
1828 | rc = -ENOMEM; | |
1829 | goto out; | |
1830 | } | |
1831 | ||
1832 | #else /* CONFIG_PROC_FS */ | |
1833 | static int __init ipv4_proc_init(void) | |
1834 | { | |
1835 | return 0; | |
1836 | } | |
1837 | #endif /* CONFIG_PROC_FS */ | |
1838 | ||
1839 | MODULE_ALIAS_NETPROTO(PF_INET); | |
1840 |