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Commit | Line | Data |
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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 | ||
f4c50d99 | 68 | #include <linux/err.h> |
1da177e4 LT |
69 | #include <linux/errno.h> |
70 | #include <linux/types.h> | |
71 | #include <linux/socket.h> | |
72 | #include <linux/in.h> | |
73 | #include <linux/kernel.h> | |
1da177e4 LT |
74 | #include <linux/module.h> |
75 | #include <linux/sched.h> | |
76 | #include <linux/timer.h> | |
77 | #include <linux/string.h> | |
78 | #include <linux/sockios.h> | |
79 | #include <linux/net.h> | |
4fc268d2 | 80 | #include <linux/capability.h> |
1da177e4 LT |
81 | #include <linux/fcntl.h> |
82 | #include <linux/mm.h> | |
83 | #include <linux/interrupt.h> | |
84 | #include <linux/stat.h> | |
85 | #include <linux/init.h> | |
86 | #include <linux/poll.h> | |
87 | #include <linux/netfilter_ipv4.h> | |
b3da2cf3 | 88 | #include <linux/random.h> |
1da177e4 LT |
89 | |
90 | #include <asm/uaccess.h> | |
91 | #include <asm/system.h> | |
92 | ||
1da177e4 LT |
93 | #include <linux/inet.h> |
94 | #include <linux/igmp.h> | |
14c85021 | 95 | #include <linux/inetdevice.h> |
1da177e4 LT |
96 | #include <linux/netdevice.h> |
97 | #include <net/ip.h> | |
98 | #include <net/protocol.h> | |
99 | #include <net/arp.h> | |
100 | #include <net/route.h> | |
101 | #include <net/ip_fib.h> | |
295f7324 | 102 | #include <net/inet_connection_sock.h> |
1da177e4 LT |
103 | #include <net/tcp.h> |
104 | #include <net/udp.h> | |
ba4e58ec | 105 | #include <net/udplite.h> |
1da177e4 LT |
106 | #include <linux/skbuff.h> |
107 | #include <net/sock.h> | |
108 | #include <net/raw.h> | |
109 | #include <net/icmp.h> | |
110 | #include <net/ipip.h> | |
111 | #include <net/inet_common.h> | |
112 | #include <net/xfrm.h> | |
9b4661bd | 113 | #include <net/net_namespace.h> |
1da177e4 LT |
114 | #ifdef CONFIG_IP_MROUTE |
115 | #include <linux/mroute.h> | |
116 | #endif | |
117 | ||
ba89966c | 118 | DEFINE_SNMP_STAT(struct linux_mib, net_statistics) __read_mostly; |
1da177e4 | 119 | |
1da177e4 LT |
120 | extern void ip_mc_drop_socket(struct sock *sk); |
121 | ||
122 | /* The inetsw table contains everything that inet_create needs to | |
123 | * build a new socket. | |
124 | */ | |
125 | static struct list_head inetsw[SOCK_MAX]; | |
126 | static DEFINE_SPINLOCK(inetsw_lock); | |
127 | ||
9ba63979 PE |
128 | struct ipv4_config ipv4_config; |
129 | ||
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 LT |
143 | if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { |
144 | printk("Attempt to release TCP socket in state %d %p\n", | |
145 | sk->sk_state, sk); | |
146 | return; | |
147 | } | |
148 | if (!sock_flag(sk, SOCK_DEAD)) { | |
149 | printk("Attempt to release alive inet socket %p\n", sk); | |
150 | return; | |
151 | } | |
152 | ||
153 | BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); | |
154 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); | |
155 | BUG_TRAP(!sk->sk_wmem_queued); | |
156 | BUG_TRAP(!sk->sk_forward_alloc); | |
157 | ||
a51482bd | 158 | kfree(inet->opt); |
1da177e4 | 159 | dst_release(sk->sk_dst_cache); |
e6848976 | 160 | sk_refcnt_debug_dec(sk); |
1da177e4 LT |
161 | } |
162 | ||
163 | /* | |
164 | * The routines beyond this point handle the behaviour of an AF_INET | |
165 | * socket object. Mostly it punts to the subprotocols of IP to do | |
166 | * the work. | |
167 | */ | |
168 | ||
169 | /* | |
170 | * Automatically bind an unbound socket. | |
171 | */ | |
172 | ||
173 | static int inet_autobind(struct sock *sk) | |
174 | { | |
175 | struct inet_sock *inet; | |
176 | /* We may need to bind the socket. */ | |
177 | lock_sock(sk); | |
178 | inet = inet_sk(sk); | |
179 | if (!inet->num) { | |
180 | if (sk->sk_prot->get_port(sk, 0)) { | |
181 | release_sock(sk); | |
182 | return -EAGAIN; | |
183 | } | |
184 | inet->sport = htons(inet->num); | |
185 | } | |
186 | release_sock(sk); | |
187 | return 0; | |
188 | } | |
189 | ||
190 | /* | |
191 | * Move a socket into listening state. | |
192 | */ | |
193 | int inet_listen(struct socket *sock, int backlog) | |
194 | { | |
195 | struct sock *sk = sock->sk; | |
196 | unsigned char old_state; | |
197 | int err; | |
198 | ||
199 | lock_sock(sk); | |
200 | ||
201 | err = -EINVAL; | |
202 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) | |
203 | goto out; | |
204 | ||
205 | old_state = sk->sk_state; | |
206 | if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) | |
207 | goto out; | |
208 | ||
209 | /* Really, if the socket is already in listen state | |
210 | * we can only allow the backlog to be adjusted. | |
211 | */ | |
212 | if (old_state != TCP_LISTEN) { | |
72a3effa | 213 | err = inet_csk_listen_start(sk, backlog); |
1da177e4 LT |
214 | if (err) |
215 | goto out; | |
216 | } | |
217 | sk->sk_max_ack_backlog = backlog; | |
218 | err = 0; | |
219 | ||
220 | out: | |
221 | release_sock(sk); | |
222 | return err; | |
223 | } | |
224 | ||
be776281 | 225 | u32 inet_ehash_secret __read_mostly; |
b3da2cf3 DM |
226 | EXPORT_SYMBOL(inet_ehash_secret); |
227 | ||
be776281 ED |
228 | /* |
229 | * inet_ehash_secret must be set exactly once | |
230 | * Instead of using a dedicated spinlock, we (ab)use inetsw_lock | |
231 | */ | |
b3da2cf3 DM |
232 | void build_ehash_secret(void) |
233 | { | |
be776281 ED |
234 | u32 rnd; |
235 | do { | |
236 | get_random_bytes(&rnd, sizeof(rnd)); | |
237 | } while (rnd == 0); | |
238 | spin_lock_bh(&inetsw_lock); | |
239 | if (!inet_ehash_secret) | |
240 | inet_ehash_secret = rnd; | |
241 | spin_unlock_bh(&inetsw_lock); | |
b3da2cf3 DM |
242 | } |
243 | EXPORT_SYMBOL(build_ehash_secret); | |
244 | ||
2342fd7e DL |
245 | static inline int inet_netns_ok(struct net *net, int protocol) |
246 | { | |
247 | int hash; | |
248 | struct net_protocol *ipprot; | |
249 | ||
250 | if (net == &init_net) | |
251 | return 1; | |
252 | ||
253 | hash = protocol & (MAX_INET_PROTOS - 1); | |
254 | ipprot = rcu_dereference(inet_protos[hash]); | |
255 | ||
256 | if (ipprot == NULL) | |
257 | /* raw IP is OK */ | |
258 | return 1; | |
259 | return ipprot->netns_ok; | |
260 | } | |
261 | ||
1da177e4 LT |
262 | /* |
263 | * Create an inet socket. | |
264 | */ | |
265 | ||
1b8d7ae4 | 266 | static int inet_create(struct net *net, struct socket *sock, int protocol) |
1da177e4 LT |
267 | { |
268 | struct sock *sk; | |
269 | struct list_head *p; | |
270 | struct inet_protosw *answer; | |
271 | struct inet_sock *inet; | |
272 | struct proto *answer_prot; | |
273 | unsigned char answer_flags; | |
274 | char answer_no_check; | |
bb97d31f | 275 | int try_loading_module = 0; |
86c8f9d1 | 276 | int err; |
1da177e4 | 277 | |
b3da2cf3 DM |
278 | if (sock->type != SOCK_RAW && |
279 | sock->type != SOCK_DGRAM && | |
280 | !inet_ehash_secret) | |
281 | build_ehash_secret(); | |
282 | ||
1da177e4 LT |
283 | sock->state = SS_UNCONNECTED; |
284 | ||
285 | /* Look for the requested type/protocol pair. */ | |
286 | answer = NULL; | |
bb97d31f | 287 | lookup_protocol: |
86c8f9d1 | 288 | err = -ESOCKTNOSUPPORT; |
1da177e4 LT |
289 | rcu_read_lock(); |
290 | list_for_each_rcu(p, &inetsw[sock->type]) { | |
291 | answer = list_entry(p, struct inet_protosw, list); | |
292 | ||
293 | /* Check the non-wild match. */ | |
294 | if (protocol == answer->protocol) { | |
295 | if (protocol != IPPROTO_IP) | |
296 | break; | |
297 | } else { | |
298 | /* Check for the two wild cases. */ | |
299 | if (IPPROTO_IP == protocol) { | |
300 | protocol = answer->protocol; | |
301 | break; | |
302 | } | |
303 | if (IPPROTO_IP == answer->protocol) | |
304 | break; | |
305 | } | |
86c8f9d1 | 306 | err = -EPROTONOSUPPORT; |
1da177e4 LT |
307 | answer = NULL; |
308 | } | |
309 | ||
bb97d31f ACM |
310 | if (unlikely(answer == NULL)) { |
311 | if (try_loading_module < 2) { | |
312 | rcu_read_unlock(); | |
313 | /* | |
314 | * Be more specific, e.g. net-pf-2-proto-132-type-1 | |
315 | * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) | |
316 | */ | |
317 | if (++try_loading_module == 1) | |
318 | request_module("net-pf-%d-proto-%d-type-%d", | |
319 | PF_INET, protocol, sock->type); | |
320 | /* | |
321 | * Fall back to generic, e.g. net-pf-2-proto-132 | |
322 | * (net-pf-PF_INET-proto-IPPROTO_SCTP) | |
323 | */ | |
324 | else | |
325 | request_module("net-pf-%d-proto-%d", | |
326 | PF_INET, protocol); | |
327 | goto lookup_protocol; | |
328 | } else | |
329 | goto out_rcu_unlock; | |
330 | } | |
331 | ||
1da177e4 LT |
332 | err = -EPERM; |
333 | if (answer->capability > 0 && !capable(answer->capability)) | |
334 | goto out_rcu_unlock; | |
1da177e4 | 335 | |
2342fd7e DL |
336 | err = -EAFNOSUPPORT; |
337 | if (!inet_netns_ok(net, protocol)) | |
338 | goto out_rcu_unlock; | |
339 | ||
1da177e4 LT |
340 | sock->ops = answer->ops; |
341 | answer_prot = answer->prot; | |
342 | answer_no_check = answer->no_check; | |
343 | answer_flags = answer->flags; | |
344 | rcu_read_unlock(); | |
345 | ||
346 | BUG_TRAP(answer_prot->slab != NULL); | |
347 | ||
348 | err = -ENOBUFS; | |
6257ff21 | 349 | sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); |
1da177e4 LT |
350 | if (sk == NULL) |
351 | goto out; | |
352 | ||
353 | err = 0; | |
354 | sk->sk_no_check = answer_no_check; | |
355 | if (INET_PROTOSW_REUSE & answer_flags) | |
356 | sk->sk_reuse = 1; | |
357 | ||
358 | inet = inet_sk(sk); | |
469de9b9 | 359 | inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; |
1da177e4 LT |
360 | |
361 | if (SOCK_RAW == sock->type) { | |
362 | inet->num = protocol; | |
363 | if (IPPROTO_RAW == protocol) | |
364 | inet->hdrincl = 1; | |
365 | } | |
366 | ||
367 | if (ipv4_config.no_pmtu_disc) | |
368 | inet->pmtudisc = IP_PMTUDISC_DONT; | |
369 | else | |
370 | inet->pmtudisc = IP_PMTUDISC_WANT; | |
371 | ||
372 | inet->id = 0; | |
373 | ||
374 | sock_init_data(sock, sk); | |
375 | ||
376 | sk->sk_destruct = inet_sock_destruct; | |
377 | sk->sk_family = PF_INET; | |
378 | sk->sk_protocol = protocol; | |
379 | sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; | |
380 | ||
381 | inet->uc_ttl = -1; | |
382 | inet->mc_loop = 1; | |
383 | inet->mc_ttl = 1; | |
384 | inet->mc_index = 0; | |
385 | inet->mc_list = NULL; | |
386 | ||
e6848976 | 387 | sk_refcnt_debug_inc(sk); |
1da177e4 LT |
388 | |
389 | if (inet->num) { | |
390 | /* It assumes that any protocol which allows | |
391 | * the user to assign a number at socket | |
392 | * creation time automatically | |
393 | * shares. | |
394 | */ | |
395 | inet->sport = htons(inet->num); | |
396 | /* Add to protocol hash chains. */ | |
397 | sk->sk_prot->hash(sk); | |
398 | } | |
399 | ||
400 | if (sk->sk_prot->init) { | |
401 | err = sk->sk_prot->init(sk); | |
402 | if (err) | |
403 | sk_common_release(sk); | |
404 | } | |
405 | out: | |
406 | return err; | |
407 | out_rcu_unlock: | |
408 | rcu_read_unlock(); | |
409 | goto out; | |
410 | } | |
411 | ||
412 | ||
413 | /* | |
414 | * The peer socket should always be NULL (or else). When we call this | |
415 | * function we are destroying the object and from then on nobody | |
416 | * should refer to it. | |
417 | */ | |
418 | int inet_release(struct socket *sock) | |
419 | { | |
420 | struct sock *sk = sock->sk; | |
421 | ||
422 | if (sk) { | |
423 | long timeout; | |
424 | ||
425 | /* Applications forget to leave groups before exiting */ | |
426 | ip_mc_drop_socket(sk); | |
427 | ||
428 | /* If linger is set, we don't return until the close | |
429 | * is complete. Otherwise we return immediately. The | |
430 | * actually closing is done the same either way. | |
431 | * | |
432 | * If the close is due to the process exiting, we never | |
433 | * linger.. | |
434 | */ | |
435 | timeout = 0; | |
436 | if (sock_flag(sk, SOCK_LINGER) && | |
437 | !(current->flags & PF_EXITING)) | |
438 | timeout = sk->sk_lingertime; | |
439 | sock->sk = NULL; | |
440 | sk->sk_prot->close(sk, timeout); | |
441 | } | |
442 | return 0; | |
443 | } | |
444 | ||
445 | /* It is off by default, see below. */ | |
ab32ea5d | 446 | int sysctl_ip_nonlocal_bind __read_mostly; |
1da177e4 LT |
447 | |
448 | int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
449 | { | |
450 | struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; | |
451 | struct sock *sk = sock->sk; | |
452 | struct inet_sock *inet = inet_sk(sk); | |
453 | unsigned short snum; | |
454 | int chk_addr_ret; | |
455 | int err; | |
456 | ||
457 | /* If the socket has its own bind function then use it. (RAW) */ | |
458 | if (sk->sk_prot->bind) { | |
459 | err = sk->sk_prot->bind(sk, uaddr, addr_len); | |
460 | goto out; | |
461 | } | |
462 | err = -EINVAL; | |
463 | if (addr_len < sizeof(struct sockaddr_in)) | |
464 | goto out; | |
465 | ||
3b1e0a65 | 466 | chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); |
1da177e4 LT |
467 | |
468 | /* Not specified by any standard per-se, however it breaks too | |
469 | * many applications when removed. It is unfortunate since | |
470 | * allowing applications to make a non-local bind solves | |
471 | * several problems with systems using dynamic addressing. | |
472 | * (ie. your servers still start up even if your ISDN link | |
473 | * is temporarily down) | |
474 | */ | |
475 | err = -EADDRNOTAVAIL; | |
476 | if (!sysctl_ip_nonlocal_bind && | |
477 | !inet->freebind && | |
e6f1cebf | 478 | addr->sin_addr.s_addr != htonl(INADDR_ANY) && |
1da177e4 LT |
479 | chk_addr_ret != RTN_LOCAL && |
480 | chk_addr_ret != RTN_MULTICAST && | |
481 | chk_addr_ret != RTN_BROADCAST) | |
482 | goto out; | |
483 | ||
484 | snum = ntohs(addr->sin_port); | |
485 | err = -EACCES; | |
486 | if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) | |
487 | goto out; | |
488 | ||
489 | /* We keep a pair of addresses. rcv_saddr is the one | |
490 | * used by hash lookups, and saddr is used for transmit. | |
491 | * | |
492 | * In the BSD API these are the same except where it | |
493 | * would be illegal to use them (multicast/broadcast) in | |
494 | * which case the sending device address is used. | |
495 | */ | |
496 | lock_sock(sk); | |
497 | ||
498 | /* Check these errors (active socket, double bind). */ | |
499 | err = -EINVAL; | |
500 | if (sk->sk_state != TCP_CLOSE || inet->num) | |
501 | goto out_release_sock; | |
502 | ||
503 | inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; | |
504 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) | |
505 | inet->saddr = 0; /* Use device */ | |
506 | ||
507 | /* Make sure we are allowed to bind here. */ | |
508 | if (sk->sk_prot->get_port(sk, snum)) { | |
509 | inet->saddr = inet->rcv_saddr = 0; | |
510 | err = -EADDRINUSE; | |
511 | goto out_release_sock; | |
512 | } | |
513 | ||
514 | if (inet->rcv_saddr) | |
515 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; | |
516 | if (snum) | |
517 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
518 | inet->sport = htons(inet->num); | |
519 | inet->daddr = 0; | |
520 | inet->dport = 0; | |
521 | sk_dst_reset(sk); | |
522 | err = 0; | |
523 | out_release_sock: | |
524 | release_sock(sk); | |
525 | out: | |
526 | return err; | |
527 | } | |
528 | ||
529 | int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, | |
530 | int addr_len, int flags) | |
531 | { | |
532 | struct sock *sk = sock->sk; | |
533 | ||
534 | if (uaddr->sa_family == AF_UNSPEC) | |
535 | return sk->sk_prot->disconnect(sk, flags); | |
536 | ||
537 | if (!inet_sk(sk)->num && inet_autobind(sk)) | |
538 | return -EAGAIN; | |
539 | return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); | |
540 | } | |
541 | ||
542 | static long inet_wait_for_connect(struct sock *sk, long timeo) | |
543 | { | |
544 | DEFINE_WAIT(wait); | |
545 | ||
546 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
547 | ||
548 | /* Basic assumption: if someone sets sk->sk_err, he _must_ | |
549 | * change state of the socket from TCP_SYN_*. | |
550 | * Connect() does not allow to get error notifications | |
551 | * without closing the socket. | |
552 | */ | |
553 | while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { | |
554 | release_sock(sk); | |
555 | timeo = schedule_timeout(timeo); | |
556 | lock_sock(sk); | |
557 | if (signal_pending(current) || !timeo) | |
558 | break; | |
559 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
560 | } | |
561 | finish_wait(sk->sk_sleep, &wait); | |
562 | return timeo; | |
563 | } | |
564 | ||
565 | /* | |
566 | * Connect to a remote host. There is regrettably still a little | |
567 | * TCP 'magic' in here. | |
568 | */ | |
569 | int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, | |
570 | int addr_len, int flags) | |
571 | { | |
572 | struct sock *sk = sock->sk; | |
573 | int err; | |
574 | long timeo; | |
575 | ||
576 | lock_sock(sk); | |
577 | ||
578 | if (uaddr->sa_family == AF_UNSPEC) { | |
579 | err = sk->sk_prot->disconnect(sk, flags); | |
580 | sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; | |
581 | goto out; | |
582 | } | |
583 | ||
584 | switch (sock->state) { | |
585 | default: | |
586 | err = -EINVAL; | |
587 | goto out; | |
588 | case SS_CONNECTED: | |
589 | err = -EISCONN; | |
590 | goto out; | |
591 | case SS_CONNECTING: | |
592 | err = -EALREADY; | |
593 | /* Fall out of switch with err, set for this state */ | |
594 | break; | |
595 | case SS_UNCONNECTED: | |
596 | err = -EISCONN; | |
597 | if (sk->sk_state != TCP_CLOSE) | |
598 | goto out; | |
599 | ||
600 | err = sk->sk_prot->connect(sk, uaddr, addr_len); | |
601 | if (err < 0) | |
602 | goto out; | |
603 | ||
e905a9ed | 604 | sock->state = SS_CONNECTING; |
1da177e4 LT |
605 | |
606 | /* Just entered SS_CONNECTING state; the only | |
607 | * difference is that return value in non-blocking | |
608 | * case is EINPROGRESS, rather than EALREADY. | |
609 | */ | |
610 | err = -EINPROGRESS; | |
611 | break; | |
612 | } | |
613 | ||
614 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); | |
615 | ||
616 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { | |
617 | /* Error code is set above */ | |
618 | if (!timeo || !inet_wait_for_connect(sk, timeo)) | |
619 | goto out; | |
620 | ||
621 | err = sock_intr_errno(timeo); | |
622 | if (signal_pending(current)) | |
623 | goto out; | |
624 | } | |
625 | ||
626 | /* Connection was closed by RST, timeout, ICMP error | |
627 | * or another process disconnected us. | |
628 | */ | |
629 | if (sk->sk_state == TCP_CLOSE) | |
630 | goto sock_error; | |
631 | ||
632 | /* sk->sk_err may be not zero now, if RECVERR was ordered by user | |
633 | * and error was received after socket entered established state. | |
634 | * Hence, it is handled normally after connect() return successfully. | |
635 | */ | |
636 | ||
637 | sock->state = SS_CONNECTED; | |
638 | err = 0; | |
639 | out: | |
640 | release_sock(sk); | |
641 | return err; | |
642 | ||
643 | sock_error: | |
644 | err = sock_error(sk) ? : -ECONNABORTED; | |
645 | sock->state = SS_UNCONNECTED; | |
646 | if (sk->sk_prot->disconnect(sk, flags)) | |
647 | sock->state = SS_DISCONNECTING; | |
648 | goto out; | |
649 | } | |
650 | ||
651 | /* | |
652 | * Accept a pending connection. The TCP layer now gives BSD semantics. | |
653 | */ | |
654 | ||
655 | int inet_accept(struct socket *sock, struct socket *newsock, int flags) | |
656 | { | |
657 | struct sock *sk1 = sock->sk; | |
658 | int err = -EINVAL; | |
659 | struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); | |
660 | ||
661 | if (!sk2) | |
662 | goto do_err; | |
663 | ||
664 | lock_sock(sk2); | |
665 | ||
666 | BUG_TRAP((1 << sk2->sk_state) & | |
667 | (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)); | |
668 | ||
669 | sock_graft(sk2, newsock); | |
670 | ||
671 | newsock->state = SS_CONNECTED; | |
672 | err = 0; | |
673 | release_sock(sk2); | |
674 | do_err: | |
675 | return err; | |
676 | } | |
677 | ||
678 | ||
679 | /* | |
680 | * This does both peername and sockname. | |
681 | */ | |
682 | int inet_getname(struct socket *sock, struct sockaddr *uaddr, | |
683 | int *uaddr_len, int peer) | |
684 | { | |
685 | struct sock *sk = sock->sk; | |
686 | struct inet_sock *inet = inet_sk(sk); | |
687 | struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; | |
688 | ||
689 | sin->sin_family = AF_INET; | |
690 | if (peer) { | |
691 | if (!inet->dport || | |
692 | (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && | |
693 | peer == 1)) | |
694 | return -ENOTCONN; | |
695 | sin->sin_port = inet->dport; | |
696 | sin->sin_addr.s_addr = inet->daddr; | |
697 | } else { | |
714e85be | 698 | __be32 addr = inet->rcv_saddr; |
1da177e4 LT |
699 | if (!addr) |
700 | addr = inet->saddr; | |
701 | sin->sin_port = inet->sport; | |
702 | sin->sin_addr.s_addr = addr; | |
703 | } | |
704 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
705 | *uaddr_len = sizeof(*sin); | |
706 | return 0; | |
707 | } | |
708 | ||
709 | int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, | |
710 | size_t size) | |
711 | { | |
712 | struct sock *sk = sock->sk; | |
713 | ||
714 | /* We may need to bind the socket. */ | |
715 | if (!inet_sk(sk)->num && inet_autobind(sk)) | |
716 | return -EAGAIN; | |
717 | ||
718 | return sk->sk_prot->sendmsg(iocb, sk, msg, size); | |
719 | } | |
720 | ||
721 | ||
722 | static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
723 | { | |
724 | struct sock *sk = sock->sk; | |
725 | ||
726 | /* We may need to bind the socket. */ | |
727 | if (!inet_sk(sk)->num && inet_autobind(sk)) | |
728 | return -EAGAIN; | |
729 | ||
730 | if (sk->sk_prot->sendpage) | |
731 | return sk->sk_prot->sendpage(sk, page, offset, size, flags); | |
732 | return sock_no_sendpage(sock, page, offset, size, flags); | |
733 | } | |
734 | ||
735 | ||
736 | int inet_shutdown(struct socket *sock, int how) | |
737 | { | |
738 | struct sock *sk = sock->sk; | |
739 | int err = 0; | |
740 | ||
741 | /* This should really check to make sure | |
742 | * the socket is a TCP socket. (WHY AC...) | |
743 | */ | |
744 | how++; /* maps 0->1 has the advantage of making bit 1 rcvs and | |
745 | 1->2 bit 2 snds. | |
746 | 2->3 */ | |
747 | if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ | |
748 | return -EINVAL; | |
749 | ||
750 | lock_sock(sk); | |
751 | if (sock->state == SS_CONNECTING) { | |
752 | if ((1 << sk->sk_state) & | |
753 | (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) | |
754 | sock->state = SS_DISCONNECTING; | |
755 | else | |
756 | sock->state = SS_CONNECTED; | |
757 | } | |
758 | ||
759 | switch (sk->sk_state) { | |
760 | case TCP_CLOSE: | |
761 | err = -ENOTCONN; | |
762 | /* Hack to wake up other listeners, who can poll for | |
763 | POLLHUP, even on eg. unconnected UDP sockets -- RR */ | |
764 | default: | |
765 | sk->sk_shutdown |= how; | |
766 | if (sk->sk_prot->shutdown) | |
767 | sk->sk_prot->shutdown(sk, how); | |
768 | break; | |
769 | ||
770 | /* Remaining two branches are temporary solution for missing | |
771 | * close() in multithreaded environment. It is _not_ a good idea, | |
772 | * but we have no choice until close() is repaired at VFS level. | |
773 | */ | |
774 | case TCP_LISTEN: | |
775 | if (!(how & RCV_SHUTDOWN)) | |
776 | break; | |
777 | /* Fall through */ | |
778 | case TCP_SYN_SENT: | |
779 | err = sk->sk_prot->disconnect(sk, O_NONBLOCK); | |
780 | sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; | |
781 | break; | |
782 | } | |
783 | ||
784 | /* Wake up anyone sleeping in poll. */ | |
785 | sk->sk_state_change(sk); | |
786 | release_sock(sk); | |
787 | return err; | |
788 | } | |
789 | ||
790 | /* | |
791 | * ioctl() calls you can issue on an INET socket. Most of these are | |
792 | * device configuration and stuff and very rarely used. Some ioctls | |
793 | * pass on to the socket itself. | |
794 | * | |
795 | * NOTE: I like the idea of a module for the config stuff. ie ifconfig | |
796 | * loads the devconfigure module does its configuring and unloads it. | |
797 | * There's a good 20K of config code hanging around the kernel. | |
798 | */ | |
799 | ||
800 | int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
801 | { | |
802 | struct sock *sk = sock->sk; | |
803 | int err = 0; | |
3b1e0a65 | 804 | struct net *net = sock_net(sk); |
1da177e4 LT |
805 | |
806 | switch (cmd) { | |
807 | case SIOCGSTAMP: | |
808 | err = sock_get_timestamp(sk, (struct timeval __user *)arg); | |
809 | break; | |
ae40eb1e ED |
810 | case SIOCGSTAMPNS: |
811 | err = sock_get_timestampns(sk, (struct timespec __user *)arg); | |
812 | break; | |
1da177e4 LT |
813 | case SIOCADDRT: |
814 | case SIOCDELRT: | |
815 | case SIOCRTMSG: | |
e5b13cb1 | 816 | err = ip_rt_ioctl(net, cmd, (void __user *)arg); |
1da177e4 LT |
817 | break; |
818 | case SIOCDARP: | |
819 | case SIOCGARP: | |
820 | case SIOCSARP: | |
e5b13cb1 | 821 | err = arp_ioctl(net, cmd, (void __user *)arg); |
1da177e4 LT |
822 | break; |
823 | case SIOCGIFADDR: | |
824 | case SIOCSIFADDR: | |
825 | case SIOCGIFBRDADDR: | |
826 | case SIOCSIFBRDADDR: | |
827 | case SIOCGIFNETMASK: | |
828 | case SIOCSIFNETMASK: | |
829 | case SIOCGIFDSTADDR: | |
830 | case SIOCSIFDSTADDR: | |
831 | case SIOCSIFPFLAGS: | |
832 | case SIOCGIFPFLAGS: | |
833 | case SIOCSIFFLAGS: | |
e5b13cb1 | 834 | err = devinet_ioctl(net, cmd, (void __user *)arg); |
1da177e4 LT |
835 | break; |
836 | default: | |
b5e5fa5e CH |
837 | if (sk->sk_prot->ioctl) |
838 | err = sk->sk_prot->ioctl(sk, cmd, arg); | |
839 | else | |
840 | err = -ENOIOCTLCMD; | |
1da177e4 LT |
841 | break; |
842 | } | |
843 | return err; | |
844 | } | |
845 | ||
90ddc4f0 | 846 | const struct proto_ops inet_stream_ops = { |
543d9cfe ACM |
847 | .family = PF_INET, |
848 | .owner = THIS_MODULE, | |
849 | .release = inet_release, | |
850 | .bind = inet_bind, | |
851 | .connect = inet_stream_connect, | |
852 | .socketpair = sock_no_socketpair, | |
853 | .accept = inet_accept, | |
854 | .getname = inet_getname, | |
855 | .poll = tcp_poll, | |
856 | .ioctl = inet_ioctl, | |
857 | .listen = inet_listen, | |
858 | .shutdown = inet_shutdown, | |
859 | .setsockopt = sock_common_setsockopt, | |
860 | .getsockopt = sock_common_getsockopt, | |
3516ffb0 | 861 | .sendmsg = tcp_sendmsg, |
543d9cfe ACM |
862 | .recvmsg = sock_common_recvmsg, |
863 | .mmap = sock_no_mmap, | |
864 | .sendpage = tcp_sendpage, | |
9c55e01c | 865 | .splice_read = tcp_splice_read, |
3fdadf7d | 866 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
867 | .compat_setsockopt = compat_sock_common_setsockopt, |
868 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 869 | #endif |
1da177e4 LT |
870 | }; |
871 | ||
90ddc4f0 | 872 | const struct proto_ops inet_dgram_ops = { |
543d9cfe ACM |
873 | .family = PF_INET, |
874 | .owner = THIS_MODULE, | |
875 | .release = inet_release, | |
876 | .bind = inet_bind, | |
877 | .connect = inet_dgram_connect, | |
878 | .socketpair = sock_no_socketpair, | |
879 | .accept = sock_no_accept, | |
880 | .getname = inet_getname, | |
881 | .poll = udp_poll, | |
882 | .ioctl = inet_ioctl, | |
883 | .listen = sock_no_listen, | |
884 | .shutdown = inet_shutdown, | |
885 | .setsockopt = sock_common_setsockopt, | |
886 | .getsockopt = sock_common_getsockopt, | |
887 | .sendmsg = inet_sendmsg, | |
888 | .recvmsg = sock_common_recvmsg, | |
889 | .mmap = sock_no_mmap, | |
890 | .sendpage = inet_sendpage, | |
3fdadf7d | 891 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
892 | .compat_setsockopt = compat_sock_common_setsockopt, |
893 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 894 | #endif |
1da177e4 LT |
895 | }; |
896 | ||
897 | /* | |
898 | * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without | |
899 | * udp_poll | |
900 | */ | |
90ddc4f0 | 901 | static const struct proto_ops inet_sockraw_ops = { |
543d9cfe ACM |
902 | .family = PF_INET, |
903 | .owner = THIS_MODULE, | |
904 | .release = inet_release, | |
905 | .bind = inet_bind, | |
906 | .connect = inet_dgram_connect, | |
907 | .socketpair = sock_no_socketpair, | |
908 | .accept = sock_no_accept, | |
909 | .getname = inet_getname, | |
910 | .poll = datagram_poll, | |
911 | .ioctl = inet_ioctl, | |
912 | .listen = sock_no_listen, | |
913 | .shutdown = inet_shutdown, | |
914 | .setsockopt = sock_common_setsockopt, | |
915 | .getsockopt = sock_common_getsockopt, | |
916 | .sendmsg = inet_sendmsg, | |
917 | .recvmsg = sock_common_recvmsg, | |
918 | .mmap = sock_no_mmap, | |
919 | .sendpage = inet_sendpage, | |
3fdadf7d | 920 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
921 | .compat_setsockopt = compat_sock_common_setsockopt, |
922 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 923 | #endif |
1da177e4 LT |
924 | }; |
925 | ||
926 | static struct net_proto_family inet_family_ops = { | |
927 | .family = PF_INET, | |
928 | .create = inet_create, | |
929 | .owner = THIS_MODULE, | |
930 | }; | |
931 | ||
1da177e4 LT |
932 | /* Upon startup we insert all the elements in inetsw_array[] into |
933 | * the linked list inetsw. | |
934 | */ | |
935 | static struct inet_protosw inetsw_array[] = | |
936 | { | |
e905a9ed YH |
937 | { |
938 | .type = SOCK_STREAM, | |
939 | .protocol = IPPROTO_TCP, | |
940 | .prot = &tcp_prot, | |
941 | .ops = &inet_stream_ops, | |
942 | .capability = -1, | |
943 | .no_check = 0, | |
944 | .flags = INET_PROTOSW_PERMANENT | | |
d83d8461 | 945 | INET_PROTOSW_ICSK, |
e905a9ed YH |
946 | }, |
947 | ||
948 | { | |
949 | .type = SOCK_DGRAM, | |
950 | .protocol = IPPROTO_UDP, | |
951 | .prot = &udp_prot, | |
952 | .ops = &inet_dgram_ops, | |
953 | .capability = -1, | |
954 | .no_check = UDP_CSUM_DEFAULT, | |
955 | .flags = INET_PROTOSW_PERMANENT, | |
1da177e4 | 956 | }, |
e905a9ed | 957 | |
1da177e4 LT |
958 | |
959 | { | |
e905a9ed YH |
960 | .type = SOCK_RAW, |
961 | .protocol = IPPROTO_IP, /* wild card */ | |
962 | .prot = &raw_prot, | |
963 | .ops = &inet_sockraw_ops, | |
964 | .capability = CAP_NET_RAW, | |
965 | .no_check = UDP_CSUM_DEFAULT, | |
966 | .flags = INET_PROTOSW_REUSE, | |
1da177e4 LT |
967 | } |
968 | }; | |
969 | ||
c40f6fff | 970 | #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) |
1da177e4 LT |
971 | |
972 | void inet_register_protosw(struct inet_protosw *p) | |
973 | { | |
974 | struct list_head *lh; | |
975 | struct inet_protosw *answer; | |
976 | int protocol = p->protocol; | |
977 | struct list_head *last_perm; | |
978 | ||
979 | spin_lock_bh(&inetsw_lock); | |
980 | ||
981 | if (p->type >= SOCK_MAX) | |
982 | goto out_illegal; | |
983 | ||
984 | /* If we are trying to override a permanent protocol, bail. */ | |
985 | answer = NULL; | |
986 | last_perm = &inetsw[p->type]; | |
987 | list_for_each(lh, &inetsw[p->type]) { | |
988 | answer = list_entry(lh, struct inet_protosw, list); | |
989 | ||
990 | /* Check only the non-wild match. */ | |
991 | if (INET_PROTOSW_PERMANENT & answer->flags) { | |
992 | if (protocol == answer->protocol) | |
993 | break; | |
994 | last_perm = lh; | |
995 | } | |
996 | ||
997 | answer = NULL; | |
998 | } | |
999 | if (answer) | |
1000 | goto out_permanent; | |
1001 | ||
1002 | /* Add the new entry after the last permanent entry if any, so that | |
1003 | * the new entry does not override a permanent entry when matched with | |
1004 | * a wild-card protocol. But it is allowed to override any existing | |
e905a9ed | 1005 | * non-permanent entry. This means that when we remove this entry, the |
1da177e4 LT |
1006 | * system automatically returns to the old behavior. |
1007 | */ | |
1008 | list_add_rcu(&p->list, last_perm); | |
1009 | out: | |
1010 | spin_unlock_bh(&inetsw_lock); | |
1011 | ||
1012 | synchronize_net(); | |
1013 | ||
1014 | return; | |
1015 | ||
1016 | out_permanent: | |
1017 | printk(KERN_ERR "Attempt to override permanent protocol %d.\n", | |
1018 | protocol); | |
1019 | goto out; | |
1020 | ||
1021 | out_illegal: | |
1022 | printk(KERN_ERR | |
1023 | "Ignoring attempt to register invalid socket type %d.\n", | |
1024 | p->type); | |
1025 | goto out; | |
1026 | } | |
1027 | ||
1028 | void inet_unregister_protosw(struct inet_protosw *p) | |
1029 | { | |
1030 | if (INET_PROTOSW_PERMANENT & p->flags) { | |
1031 | printk(KERN_ERR | |
1032 | "Attempt to unregister permanent protocol %d.\n", | |
1033 | p->protocol); | |
1034 | } else { | |
1035 | spin_lock_bh(&inetsw_lock); | |
1036 | list_del_rcu(&p->list); | |
1037 | spin_unlock_bh(&inetsw_lock); | |
1038 | ||
1039 | synchronize_net(); | |
1040 | } | |
1041 | } | |
1042 | ||
32519f11 ACM |
1043 | /* |
1044 | * Shall we try to damage output packets if routing dev changes? | |
1045 | */ | |
1046 | ||
ab32ea5d | 1047 | int sysctl_ip_dynaddr __read_mostly; |
32519f11 ACM |
1048 | |
1049 | static int inet_sk_reselect_saddr(struct sock *sk) | |
1050 | { | |
1051 | struct inet_sock *inet = inet_sk(sk); | |
1052 | int err; | |
1053 | struct rtable *rt; | |
714e85be AV |
1054 | __be32 old_saddr = inet->saddr; |
1055 | __be32 new_saddr; | |
bada8adc | 1056 | __be32 daddr = inet->daddr; |
32519f11 ACM |
1057 | |
1058 | if (inet->opt && inet->opt->srr) | |
1059 | daddr = inet->opt->faddr; | |
1060 | ||
1061 | /* Query new route. */ | |
1062 | err = ip_route_connect(&rt, daddr, 0, | |
1063 | RT_CONN_FLAGS(sk), | |
1064 | sk->sk_bound_dev_if, | |
1065 | sk->sk_protocol, | |
8eb9086f | 1066 | inet->sport, inet->dport, sk, 0); |
32519f11 ACM |
1067 | if (err) |
1068 | return err; | |
1069 | ||
1070 | sk_setup_caps(sk, &rt->u.dst); | |
1071 | ||
1072 | new_saddr = rt->rt_src; | |
1073 | ||
1074 | if (new_saddr == old_saddr) | |
1075 | return 0; | |
1076 | ||
1077 | if (sysctl_ip_dynaddr > 1) { | |
1078 | printk(KERN_INFO "%s(): shifting inet->" | |
a7d632b6 | 1079 | "saddr from " NIPQUAD_FMT " to " NIPQUAD_FMT "\n", |
0dc47877 | 1080 | __func__, |
32519f11 ACM |
1081 | NIPQUAD(old_saddr), |
1082 | NIPQUAD(new_saddr)); | |
1083 | } | |
1084 | ||
1085 | inet->saddr = inet->rcv_saddr = new_saddr; | |
1086 | ||
1087 | /* | |
1088 | * XXX The only one ugly spot where we need to | |
1089 | * XXX really change the sockets identity after | |
1090 | * XXX it has entered the hashes. -DaveM | |
1091 | * | |
1092 | * Besides that, it does not check for connection | |
1093 | * uniqueness. Wait for troubles. | |
1094 | */ | |
1095 | __sk_prot_rehash(sk); | |
1096 | return 0; | |
1097 | } | |
1098 | ||
1099 | int inet_sk_rebuild_header(struct sock *sk) | |
1100 | { | |
1101 | struct inet_sock *inet = inet_sk(sk); | |
1102 | struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); | |
3ca3c68e | 1103 | __be32 daddr; |
32519f11 ACM |
1104 | int err; |
1105 | ||
1106 | /* Route is OK, nothing to do. */ | |
1107 | if (rt) | |
1108 | return 0; | |
1109 | ||
1110 | /* Reroute. */ | |
1111 | daddr = inet->daddr; | |
1112 | if (inet->opt && inet->opt->srr) | |
1113 | daddr = inet->opt->faddr; | |
1114 | { | |
1115 | struct flowi fl = { | |
1116 | .oif = sk->sk_bound_dev_if, | |
1117 | .nl_u = { | |
1118 | .ip4_u = { | |
1119 | .daddr = daddr, | |
1120 | .saddr = inet->saddr, | |
1121 | .tos = RT_CONN_FLAGS(sk), | |
1122 | }, | |
1123 | }, | |
1124 | .proto = sk->sk_protocol, | |
1125 | .uli_u = { | |
1126 | .ports = { | |
1127 | .sport = inet->sport, | |
1128 | .dport = inet->dport, | |
1129 | }, | |
1130 | }, | |
1131 | }; | |
e905a9ed | 1132 | |
beb8d13b | 1133 | security_sk_classify_flow(sk, &fl); |
3b1e0a65 | 1134 | err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0); |
32519f11 ACM |
1135 | } |
1136 | if (!err) | |
1137 | sk_setup_caps(sk, &rt->u.dst); | |
1138 | else { | |
1139 | /* Routing failed... */ | |
1140 | sk->sk_route_caps = 0; | |
1141 | /* | |
1142 | * Other protocols have to map its equivalent state to TCP_SYN_SENT. | |
1143 | * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme | |
1144 | */ | |
1145 | if (!sysctl_ip_dynaddr || | |
1146 | sk->sk_state != TCP_SYN_SENT || | |
1147 | (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || | |
1148 | (err = inet_sk_reselect_saddr(sk)) != 0) | |
1149 | sk->sk_err_soft = -err; | |
1150 | } | |
1151 | ||
1152 | return err; | |
1153 | } | |
1154 | ||
1155 | EXPORT_SYMBOL(inet_sk_rebuild_header); | |
1156 | ||
a430a43d HX |
1157 | static int inet_gso_send_check(struct sk_buff *skb) |
1158 | { | |
1159 | struct iphdr *iph; | |
1160 | struct net_protocol *ops; | |
1161 | int proto; | |
1162 | int ihl; | |
1163 | int err = -EINVAL; | |
1164 | ||
1165 | if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) | |
1166 | goto out; | |
1167 | ||
eddc9ec5 | 1168 | iph = ip_hdr(skb); |
a430a43d HX |
1169 | ihl = iph->ihl * 4; |
1170 | if (ihl < sizeof(*iph)) | |
1171 | goto out; | |
1172 | ||
1173 | if (unlikely(!pskb_may_pull(skb, ihl))) | |
1174 | goto out; | |
1175 | ||
badff6d0 ACM |
1176 | __skb_pull(skb, ihl); |
1177 | skb_reset_transport_header(skb); | |
eddc9ec5 | 1178 | iph = ip_hdr(skb); |
a430a43d HX |
1179 | proto = iph->protocol & (MAX_INET_PROTOS - 1); |
1180 | err = -EPROTONOSUPPORT; | |
1181 | ||
1182 | rcu_read_lock(); | |
1183 | ops = rcu_dereference(inet_protos[proto]); | |
1184 | if (likely(ops && ops->gso_send_check)) | |
1185 | err = ops->gso_send_check(skb); | |
1186 | rcu_read_unlock(); | |
1187 | ||
1188 | out: | |
1189 | return err; | |
1190 | } | |
1191 | ||
576a30eb | 1192 | static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features) |
f4c50d99 HX |
1193 | { |
1194 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
1195 | struct iphdr *iph; | |
1196 | struct net_protocol *ops; | |
1197 | int proto; | |
1198 | int ihl; | |
1199 | int id; | |
1200 | ||
d212f87b SH |
1201 | if (!(features & NETIF_F_V4_CSUM)) |
1202 | features &= ~NETIF_F_SG; | |
1203 | ||
bbcf467d HX |
1204 | if (unlikely(skb_shinfo(skb)->gso_type & |
1205 | ~(SKB_GSO_TCPV4 | | |
1206 | SKB_GSO_UDP | | |
1207 | SKB_GSO_DODGY | | |
1208 | SKB_GSO_TCP_ECN | | |
1209 | 0))) | |
1210 | goto out; | |
1211 | ||
1212 | if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) | |
f4c50d99 HX |
1213 | goto out; |
1214 | ||
eddc9ec5 | 1215 | iph = ip_hdr(skb); |
f4c50d99 HX |
1216 | ihl = iph->ihl * 4; |
1217 | if (ihl < sizeof(*iph)) | |
1218 | goto out; | |
1219 | ||
bbcf467d | 1220 | if (unlikely(!pskb_may_pull(skb, ihl))) |
f4c50d99 HX |
1221 | goto out; |
1222 | ||
badff6d0 ACM |
1223 | __skb_pull(skb, ihl); |
1224 | skb_reset_transport_header(skb); | |
eddc9ec5 | 1225 | iph = ip_hdr(skb); |
f4c50d99 HX |
1226 | id = ntohs(iph->id); |
1227 | proto = iph->protocol & (MAX_INET_PROTOS - 1); | |
1228 | segs = ERR_PTR(-EPROTONOSUPPORT); | |
1229 | ||
1230 | rcu_read_lock(); | |
1231 | ops = rcu_dereference(inet_protos[proto]); | |
bbcf467d | 1232 | if (likely(ops && ops->gso_segment)) |
576a30eb | 1233 | segs = ops->gso_segment(skb, features); |
f4c50d99 HX |
1234 | rcu_read_unlock(); |
1235 | ||
801678c5 | 1236 | if (!segs || IS_ERR(segs)) |
f4c50d99 HX |
1237 | goto out; |
1238 | ||
1239 | skb = segs; | |
1240 | do { | |
eddc9ec5 | 1241 | iph = ip_hdr(skb); |
f4c50d99 HX |
1242 | iph->id = htons(id++); |
1243 | iph->tot_len = htons(skb->len - skb->mac_len); | |
1244 | iph->check = 0; | |
d56f90a7 | 1245 | iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); |
f4c50d99 HX |
1246 | } while ((skb = skb->next)); |
1247 | ||
1248 | out: | |
1249 | return segs; | |
1250 | } | |
1251 | ||
eee4fe4d | 1252 | int inet_ctl_sock_create(struct sock **sk, unsigned short family, |
5677242f DL |
1253 | unsigned short type, unsigned char protocol, |
1254 | struct net *net) | |
3d58b5fa | 1255 | { |
eee4fe4d DL |
1256 | struct socket *sock; |
1257 | int rc = sock_create_kern(family, type, protocol, &sock); | |
3d58b5fa DL |
1258 | |
1259 | if (rc == 0) { | |
eee4fe4d DL |
1260 | *sk = sock->sk; |
1261 | (*sk)->sk_allocation = GFP_ATOMIC; | |
3d58b5fa DL |
1262 | /* |
1263 | * Unhash it so that IP input processing does not even see it, | |
1264 | * we do not wish this socket to see incoming packets. | |
1265 | */ | |
eee4fe4d | 1266 | (*sk)->sk_prot->unhash(*sk); |
5677242f DL |
1267 | |
1268 | sk_change_net(*sk, net); | |
3d58b5fa DL |
1269 | } |
1270 | return rc; | |
1271 | } | |
1272 | ||
1273 | EXPORT_SYMBOL_GPL(inet_ctl_sock_create); | |
1274 | ||
5e0f0435 HX |
1275 | unsigned long snmp_fold_field(void *mib[], int offt) |
1276 | { | |
1277 | unsigned long res = 0; | |
1278 | int i; | |
1279 | ||
1280 | for_each_possible_cpu(i) { | |
1281 | res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); | |
1282 | res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); | |
1283 | } | |
1284 | return res; | |
1285 | } | |
1286 | EXPORT_SYMBOL_GPL(snmp_fold_field); | |
1287 | ||
c69bce20 | 1288 | int snmp_mib_init(void *ptr[2], size_t mibsize) |
5e0f0435 HX |
1289 | { |
1290 | BUG_ON(ptr == NULL); | |
1291 | ptr[0] = __alloc_percpu(mibsize); | |
1292 | if (!ptr[0]) | |
1293 | goto err0; | |
1294 | ptr[1] = __alloc_percpu(mibsize); | |
1295 | if (!ptr[1]) | |
1296 | goto err1; | |
1297 | return 0; | |
1298 | err1: | |
1299 | free_percpu(ptr[0]); | |
1300 | ptr[0] = NULL; | |
1301 | err0: | |
1302 | return -ENOMEM; | |
1303 | } | |
1304 | EXPORT_SYMBOL_GPL(snmp_mib_init); | |
1305 | ||
1306 | void snmp_mib_free(void *ptr[2]) | |
1307 | { | |
1308 | BUG_ON(ptr == NULL); | |
1309 | free_percpu(ptr[0]); | |
1310 | free_percpu(ptr[1]); | |
1311 | ptr[0] = ptr[1] = NULL; | |
1312 | } | |
1313 | EXPORT_SYMBOL_GPL(snmp_mib_free); | |
1314 | ||
1da177e4 LT |
1315 | #ifdef CONFIG_IP_MULTICAST |
1316 | static struct net_protocol igmp_protocol = { | |
1317 | .handler = igmp_rcv, | |
1318 | }; | |
1319 | #endif | |
1320 | ||
1321 | static struct net_protocol tcp_protocol = { | |
1322 | .handler = tcp_v4_rcv, | |
1323 | .err_handler = tcp_v4_err, | |
a430a43d | 1324 | .gso_send_check = tcp_v4_gso_send_check, |
f4c50d99 | 1325 | .gso_segment = tcp_tso_segment, |
1da177e4 | 1326 | .no_policy = 1, |
92f1fecb | 1327 | .netns_ok = 1, |
1da177e4 LT |
1328 | }; |
1329 | ||
1330 | static struct net_protocol udp_protocol = { | |
1331 | .handler = udp_rcv, | |
1332 | .err_handler = udp_err, | |
1333 | .no_policy = 1, | |
92f1fecb | 1334 | .netns_ok = 1, |
1da177e4 LT |
1335 | }; |
1336 | ||
1337 | static struct net_protocol icmp_protocol = { | |
1338 | .handler = icmp_rcv, | |
8b7817f3 | 1339 | .no_policy = 1, |
92f1fecb | 1340 | .netns_ok = 1, |
1da177e4 LT |
1341 | }; |
1342 | ||
9b4661bd PE |
1343 | static __net_init int ipv4_mib_init_net(struct net *net) |
1344 | { | |
57ef42d5 PE |
1345 | if (snmp_mib_init((void **)net->mib.tcp_statistics, |
1346 | sizeof(struct tcp_mib)) < 0) | |
1347 | goto err_tcp_mib; | |
1348 | ||
1349 | tcp_mib_init(net); | |
9b4661bd | 1350 | return 0; |
57ef42d5 PE |
1351 | |
1352 | err_tcp_mib: | |
1353 | return -ENOMEM; | |
9b4661bd PE |
1354 | } |
1355 | ||
1356 | static __net_exit void ipv4_mib_exit_net(struct net *net) | |
1357 | { | |
57ef42d5 | 1358 | snmp_mib_free((void **)net->mib.tcp_statistics); |
9b4661bd PE |
1359 | } |
1360 | ||
1361 | static __net_initdata struct pernet_operations ipv4_mib_ops = { | |
1362 | .init = ipv4_mib_init_net, | |
1363 | .exit = ipv4_mib_exit_net, | |
1364 | }; | |
1365 | ||
1da177e4 LT |
1366 | static int __init init_ipv4_mibs(void) |
1367 | { | |
33490170 | 1368 | if (snmp_mib_init((void **)net_statistics, |
c69bce20 | 1369 | sizeof(struct linux_mib)) < 0) |
33490170 YH |
1370 | goto err_net_mib; |
1371 | if (snmp_mib_init((void **)ip_statistics, | |
c69bce20 | 1372 | sizeof(struct ipstats_mib)) < 0) |
33490170 YH |
1373 | goto err_ip_mib; |
1374 | if (snmp_mib_init((void **)icmp_statistics, | |
c69bce20 | 1375 | sizeof(struct icmp_mib)) < 0) |
33490170 | 1376 | goto err_icmp_mib; |
96793b48 | 1377 | if (snmp_mib_init((void **)icmpmsg_statistics, |
c69bce20 | 1378 | sizeof(struct icmpmsg_mib)) < 0) |
96793b48 | 1379 | goto err_icmpmsg_mib; |
33490170 | 1380 | if (snmp_mib_init((void **)udp_statistics, |
c69bce20 | 1381 | sizeof(struct udp_mib)) < 0) |
33490170 YH |
1382 | goto err_udp_mib; |
1383 | if (snmp_mib_init((void **)udplite_statistics, | |
c69bce20 | 1384 | sizeof(struct udp_mib)) < 0) |
33490170 | 1385 | goto err_udplite_mib; |
db8dac20 | 1386 | |
9b4661bd PE |
1387 | if (register_pernet_subsys(&ipv4_mib_ops)) |
1388 | goto err_net; | |
1389 | ||
1da177e4 | 1390 | return 0; |
33490170 | 1391 | |
9b4661bd PE |
1392 | err_net: |
1393 | snmp_mib_free((void **)udplite_statistics); | |
33490170 YH |
1394 | err_udplite_mib: |
1395 | snmp_mib_free((void **)udp_statistics); | |
1396 | err_udp_mib: | |
96793b48 DS |
1397 | snmp_mib_free((void **)icmpmsg_statistics); |
1398 | err_icmpmsg_mib: | |
33490170 YH |
1399 | snmp_mib_free((void **)icmp_statistics); |
1400 | err_icmp_mib: | |
1401 | snmp_mib_free((void **)ip_statistics); | |
1402 | err_ip_mib: | |
1403 | snmp_mib_free((void **)net_statistics); | |
1404 | err_net_mib: | |
1405 | return -ENOMEM; | |
1da177e4 LT |
1406 | } |
1407 | ||
1408 | static int ipv4_proc_init(void); | |
1da177e4 | 1409 | |
30e224d7 HX |
1410 | /* |
1411 | * IP protocol layer initialiser | |
1412 | */ | |
1413 | ||
1414 | static struct packet_type ip_packet_type = { | |
1415 | .type = __constant_htons(ETH_P_IP), | |
1416 | .func = ip_rcv, | |
a430a43d | 1417 | .gso_send_check = inet_gso_send_check, |
f4c50d99 | 1418 | .gso_segment = inet_gso_segment, |
30e224d7 HX |
1419 | }; |
1420 | ||
1da177e4 LT |
1421 | static int __init inet_init(void) |
1422 | { | |
1423 | struct sk_buff *dummy_skb; | |
1424 | struct inet_protosw *q; | |
1425 | struct list_head *r; | |
1426 | int rc = -EINVAL; | |
1427 | ||
ef047f5e | 1428 | BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); |
1da177e4 LT |
1429 | |
1430 | rc = proto_register(&tcp_prot, 1); | |
1431 | if (rc) | |
1432 | goto out; | |
1433 | ||
1434 | rc = proto_register(&udp_prot, 1); | |
1435 | if (rc) | |
1436 | goto out_unregister_tcp_proto; | |
1437 | ||
1438 | rc = proto_register(&raw_prot, 1); | |
1439 | if (rc) | |
1440 | goto out_unregister_udp_proto; | |
1441 | ||
1442 | /* | |
e905a9ed | 1443 | * Tell SOCKET that we are alive... |
1da177e4 LT |
1444 | */ |
1445 | ||
e905a9ed | 1446 | (void)sock_register(&inet_family_ops); |
1da177e4 LT |
1447 | |
1448 | /* | |
1449 | * Add all the base protocols. | |
1450 | */ | |
1451 | ||
1452 | if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) | |
1453 | printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); | |
1454 | if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) | |
1455 | printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); | |
1456 | if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) | |
1457 | printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); | |
1458 | #ifdef CONFIG_IP_MULTICAST | |
1459 | if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) | |
1460 | printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); | |
1461 | #endif | |
1462 | ||
1463 | /* Register the socket-side information for inet_create. */ | |
1464 | for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) | |
1465 | INIT_LIST_HEAD(r); | |
1466 | ||
1467 | for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) | |
1468 | inet_register_protosw(q); | |
1469 | ||
1470 | /* | |
1471 | * Set the ARP module up | |
1472 | */ | |
1473 | ||
1474 | arp_init(); | |
1475 | ||
e905a9ed YH |
1476 | /* |
1477 | * Set the IP module up | |
1478 | */ | |
1da177e4 LT |
1479 | |
1480 | ip_init(); | |
1481 | ||
9b0f976f | 1482 | tcp_v4_init(); |
1da177e4 LT |
1483 | |
1484 | /* Setup TCP slab cache for open requests. */ | |
1485 | tcp_init(); | |
1486 | ||
95766fff HA |
1487 | /* Setup UDP memory threshold */ |
1488 | udp_init(); | |
1489 | ||
ba4e58ec GR |
1490 | /* Add UDP-Lite (RFC 3828) */ |
1491 | udplite4_register(); | |
1da177e4 LT |
1492 | |
1493 | /* | |
1494 | * Set the ICMP layer up | |
1495 | */ | |
1496 | ||
a5710d65 DL |
1497 | if (icmp_init() < 0) |
1498 | panic("Failed to create the ICMP control socket.\n"); | |
1da177e4 LT |
1499 | |
1500 | /* | |
1501 | * Initialise the multicast router | |
1502 | */ | |
1503 | #if defined(CONFIG_IP_MROUTE) | |
03d2f897 WC |
1504 | if (ip_mr_init()) |
1505 | printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n"); | |
1da177e4 LT |
1506 | #endif |
1507 | /* | |
1508 | * Initialise per-cpu ipv4 mibs | |
e905a9ed | 1509 | */ |
1da177e4 | 1510 | |
132adf54 | 1511 | if (init_ipv4_mibs()) |
03d2f897 | 1512 | printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); |
e905a9ed | 1513 | |
1da177e4 LT |
1514 | ipv4_proc_init(); |
1515 | ||
1516 | ipfrag_init(); | |
1517 | ||
30e224d7 HX |
1518 | dev_add_pack(&ip_packet_type); |
1519 | ||
1da177e4 LT |
1520 | rc = 0; |
1521 | out: | |
1522 | return rc; | |
1da177e4 LT |
1523 | out_unregister_udp_proto: |
1524 | proto_unregister(&udp_prot); | |
321efff7 OK |
1525 | out_unregister_tcp_proto: |
1526 | proto_unregister(&tcp_prot); | |
1da177e4 LT |
1527 | goto out; |
1528 | } | |
1529 | ||
a536e077 | 1530 | fs_initcall(inet_init); |
1da177e4 LT |
1531 | |
1532 | /* ------------------------------------------------------------------------ */ | |
1533 | ||
1534 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
1535 | static int __init ipv4_proc_init(void) |
1536 | { | |
1537 | int rc = 0; | |
1538 | ||
1539 | if (raw_proc_init()) | |
1540 | goto out_raw; | |
1541 | if (tcp4_proc_init()) | |
1542 | goto out_tcp; | |
1543 | if (udp4_proc_init()) | |
1544 | goto out_udp; | |
1da177e4 LT |
1545 | if (ip_misc_proc_init()) |
1546 | goto out_misc; | |
1547 | out: | |
1548 | return rc; | |
1549 | out_misc: | |
1da177e4 LT |
1550 | udp4_proc_exit(); |
1551 | out_udp: | |
1552 | tcp4_proc_exit(); | |
1553 | out_tcp: | |
1554 | raw_proc_exit(); | |
1555 | out_raw: | |
1556 | rc = -ENOMEM; | |
1557 | goto out; | |
1558 | } | |
1559 | ||
1560 | #else /* CONFIG_PROC_FS */ | |
1561 | static int __init ipv4_proc_init(void) | |
1562 | { | |
1563 | return 0; | |
1564 | } | |
1565 | #endif /* CONFIG_PROC_FS */ | |
1566 | ||
1567 | MODULE_ALIAS_NETPROTO(PF_INET); | |
1568 | ||
1569 | EXPORT_SYMBOL(inet_accept); | |
1570 | EXPORT_SYMBOL(inet_bind); | |
1571 | EXPORT_SYMBOL(inet_dgram_connect); | |
1572 | EXPORT_SYMBOL(inet_dgram_ops); | |
1573 | EXPORT_SYMBOL(inet_getname); | |
1574 | EXPORT_SYMBOL(inet_ioctl); | |
1575 | EXPORT_SYMBOL(inet_listen); | |
1576 | EXPORT_SYMBOL(inet_register_protosw); | |
1577 | EXPORT_SYMBOL(inet_release); | |
1578 | EXPORT_SYMBOL(inet_sendmsg); | |
1579 | EXPORT_SYMBOL(inet_shutdown); | |
1580 | EXPORT_SYMBOL(inet_sock_destruct); | |
1581 | EXPORT_SYMBOL(inet_stream_connect); | |
1582 | EXPORT_SYMBOL(inet_stream_ops); | |
1583 | EXPORT_SYMBOL(inet_unregister_protosw); | |
1584 | EXPORT_SYMBOL(net_statistics); | |
cdac4e07 | 1585 | EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); |