]>
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 | ||
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> | |
113 | #ifdef CONFIG_IP_MROUTE | |
114 | #include <linux/mroute.h> | |
115 | #endif | |
116 | ||
ba89966c | 117 | DEFINE_SNMP_STAT(struct linux_mib, net_statistics) __read_mostly; |
1da177e4 | 118 | |
1da177e4 LT |
119 | extern void ip_mc_drop_socket(struct sock *sk); |
120 | ||
121 | /* The inetsw table contains everything that inet_create needs to | |
122 | * build a new socket. | |
123 | */ | |
124 | static struct list_head inetsw[SOCK_MAX]; | |
125 | static DEFINE_SPINLOCK(inetsw_lock); | |
126 | ||
9ba63979 PE |
127 | struct ipv4_config ipv4_config; |
128 | ||
129 | EXPORT_SYMBOL(ipv4_config); | |
130 | ||
1da177e4 LT |
131 | /* New destruction routine */ |
132 | ||
133 | void inet_sock_destruct(struct sock *sk) | |
134 | { | |
135 | struct inet_sock *inet = inet_sk(sk); | |
136 | ||
137 | __skb_queue_purge(&sk->sk_receive_queue); | |
138 | __skb_queue_purge(&sk->sk_error_queue); | |
139 | ||
95766fff HA |
140 | sk_mem_reclaim(sk); |
141 | ||
1da177e4 LT |
142 | if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { |
143 | printk("Attempt to release TCP socket in state %d %p\n", | |
144 | sk->sk_state, sk); | |
145 | return; | |
146 | } | |
147 | if (!sock_flag(sk, SOCK_DEAD)) { | |
148 | printk("Attempt to release alive inet socket %p\n", sk); | |
149 | return; | |
150 | } | |
151 | ||
152 | BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); | |
153 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); | |
154 | BUG_TRAP(!sk->sk_wmem_queued); | |
155 | BUG_TRAP(!sk->sk_forward_alloc); | |
156 | ||
a51482bd | 157 | kfree(inet->opt); |
1da177e4 | 158 | dst_release(sk->sk_dst_cache); |
e6848976 | 159 | sk_refcnt_debug_dec(sk); |
1da177e4 LT |
160 | } |
161 | ||
162 | /* | |
163 | * The routines beyond this point handle the behaviour of an AF_INET | |
164 | * socket object. Mostly it punts to the subprotocols of IP to do | |
165 | * the work. | |
166 | */ | |
167 | ||
168 | /* | |
169 | * Automatically bind an unbound socket. | |
170 | */ | |
171 | ||
172 | static int inet_autobind(struct sock *sk) | |
173 | { | |
174 | struct inet_sock *inet; | |
175 | /* We may need to bind the socket. */ | |
176 | lock_sock(sk); | |
177 | inet = inet_sk(sk); | |
178 | if (!inet->num) { | |
179 | if (sk->sk_prot->get_port(sk, 0)) { | |
180 | release_sock(sk); | |
181 | return -EAGAIN; | |
182 | } | |
183 | inet->sport = htons(inet->num); | |
184 | } | |
185 | release_sock(sk); | |
186 | return 0; | |
187 | } | |
188 | ||
189 | /* | |
190 | * Move a socket into listening state. | |
191 | */ | |
192 | int inet_listen(struct socket *sock, int backlog) | |
193 | { | |
194 | struct sock *sk = sock->sk; | |
195 | unsigned char old_state; | |
196 | int err; | |
197 | ||
198 | lock_sock(sk); | |
199 | ||
200 | err = -EINVAL; | |
201 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) | |
202 | goto out; | |
203 | ||
204 | old_state = sk->sk_state; | |
205 | if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) | |
206 | goto out; | |
207 | ||
208 | /* Really, if the socket is already in listen state | |
209 | * we can only allow the backlog to be adjusted. | |
210 | */ | |
211 | if (old_state != TCP_LISTEN) { | |
72a3effa | 212 | err = inet_csk_listen_start(sk, backlog); |
1da177e4 LT |
213 | if (err) |
214 | goto out; | |
215 | } | |
216 | sk->sk_max_ack_backlog = backlog; | |
217 | err = 0; | |
218 | ||
219 | out: | |
220 | release_sock(sk); | |
221 | return err; | |
222 | } | |
223 | ||
be776281 | 224 | u32 inet_ehash_secret __read_mostly; |
b3da2cf3 DM |
225 | EXPORT_SYMBOL(inet_ehash_secret); |
226 | ||
be776281 ED |
227 | /* |
228 | * inet_ehash_secret must be set exactly once | |
229 | * Instead of using a dedicated spinlock, we (ab)use inetsw_lock | |
230 | */ | |
b3da2cf3 DM |
231 | void build_ehash_secret(void) |
232 | { | |
be776281 ED |
233 | u32 rnd; |
234 | do { | |
235 | get_random_bytes(&rnd, sizeof(rnd)); | |
236 | } while (rnd == 0); | |
237 | spin_lock_bh(&inetsw_lock); | |
238 | if (!inet_ehash_secret) | |
239 | inet_ehash_secret = rnd; | |
240 | spin_unlock_bh(&inetsw_lock); | |
b3da2cf3 DM |
241 | } |
242 | EXPORT_SYMBOL(build_ehash_secret); | |
243 | ||
2342fd7e DL |
244 | static inline int inet_netns_ok(struct net *net, int protocol) |
245 | { | |
246 | int hash; | |
247 | struct net_protocol *ipprot; | |
248 | ||
249 | if (net == &init_net) | |
250 | return 1; | |
251 | ||
252 | hash = protocol & (MAX_INET_PROTOS - 1); | |
253 | ipprot = rcu_dereference(inet_protos[hash]); | |
254 | ||
255 | if (ipprot == NULL) | |
256 | /* raw IP is OK */ | |
257 | return 1; | |
258 | return ipprot->netns_ok; | |
259 | } | |
260 | ||
1da177e4 LT |
261 | /* |
262 | * Create an inet socket. | |
263 | */ | |
264 | ||
1b8d7ae4 | 265 | static int inet_create(struct net *net, struct socket *sock, int protocol) |
1da177e4 LT |
266 | { |
267 | struct sock *sk; | |
268 | struct list_head *p; | |
269 | struct inet_protosw *answer; | |
270 | struct inet_sock *inet; | |
271 | struct proto *answer_prot; | |
272 | unsigned char answer_flags; | |
273 | char answer_no_check; | |
bb97d31f | 274 | int try_loading_module = 0; |
86c8f9d1 | 275 | int err; |
1da177e4 | 276 | |
b3da2cf3 DM |
277 | if (sock->type != SOCK_RAW && |
278 | sock->type != SOCK_DGRAM && | |
279 | !inet_ehash_secret) | |
280 | build_ehash_secret(); | |
281 | ||
1da177e4 LT |
282 | sock->state = SS_UNCONNECTED; |
283 | ||
284 | /* Look for the requested type/protocol pair. */ | |
285 | answer = NULL; | |
bb97d31f | 286 | lookup_protocol: |
86c8f9d1 | 287 | err = -ESOCKTNOSUPPORT; |
1da177e4 LT |
288 | rcu_read_lock(); |
289 | list_for_each_rcu(p, &inetsw[sock->type]) { | |
290 | answer = list_entry(p, struct inet_protosw, list); | |
291 | ||
292 | /* Check the non-wild match. */ | |
293 | if (protocol == answer->protocol) { | |
294 | if (protocol != IPPROTO_IP) | |
295 | break; | |
296 | } else { | |
297 | /* Check for the two wild cases. */ | |
298 | if (IPPROTO_IP == protocol) { | |
299 | protocol = answer->protocol; | |
300 | break; | |
301 | } | |
302 | if (IPPROTO_IP == answer->protocol) | |
303 | break; | |
304 | } | |
86c8f9d1 | 305 | err = -EPROTONOSUPPORT; |
1da177e4 LT |
306 | answer = NULL; |
307 | } | |
308 | ||
bb97d31f ACM |
309 | if (unlikely(answer == NULL)) { |
310 | if (try_loading_module < 2) { | |
311 | rcu_read_unlock(); | |
312 | /* | |
313 | * Be more specific, e.g. net-pf-2-proto-132-type-1 | |
314 | * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) | |
315 | */ | |
316 | if (++try_loading_module == 1) | |
317 | request_module("net-pf-%d-proto-%d-type-%d", | |
318 | PF_INET, protocol, sock->type); | |
319 | /* | |
320 | * Fall back to generic, e.g. net-pf-2-proto-132 | |
321 | * (net-pf-PF_INET-proto-IPPROTO_SCTP) | |
322 | */ | |
323 | else | |
324 | request_module("net-pf-%d-proto-%d", | |
325 | PF_INET, protocol); | |
326 | goto lookup_protocol; | |
327 | } else | |
328 | goto out_rcu_unlock; | |
329 | } | |
330 | ||
1da177e4 LT |
331 | err = -EPERM; |
332 | if (answer->capability > 0 && !capable(answer->capability)) | |
333 | goto out_rcu_unlock; | |
1da177e4 | 334 | |
2342fd7e DL |
335 | err = -EAFNOSUPPORT; |
336 | if (!inet_netns_ok(net, protocol)) | |
337 | goto out_rcu_unlock; | |
338 | ||
1da177e4 LT |
339 | sock->ops = answer->ops; |
340 | answer_prot = answer->prot; | |
341 | answer_no_check = answer->no_check; | |
342 | answer_flags = answer->flags; | |
343 | rcu_read_unlock(); | |
344 | ||
345 | BUG_TRAP(answer_prot->slab != NULL); | |
346 | ||
347 | err = -ENOBUFS; | |
6257ff21 | 348 | sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); |
1da177e4 LT |
349 | if (sk == NULL) |
350 | goto out; | |
351 | ||
352 | err = 0; | |
353 | sk->sk_no_check = answer_no_check; | |
354 | if (INET_PROTOSW_REUSE & answer_flags) | |
355 | sk->sk_reuse = 1; | |
356 | ||
357 | inet = inet_sk(sk); | |
469de9b9 | 358 | inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; |
1da177e4 LT |
359 | |
360 | if (SOCK_RAW == sock->type) { | |
361 | inet->num = protocol; | |
362 | if (IPPROTO_RAW == protocol) | |
363 | inet->hdrincl = 1; | |
364 | } | |
365 | ||
366 | if (ipv4_config.no_pmtu_disc) | |
367 | inet->pmtudisc = IP_PMTUDISC_DONT; | |
368 | else | |
369 | inet->pmtudisc = IP_PMTUDISC_WANT; | |
370 | ||
371 | inet->id = 0; | |
372 | ||
373 | sock_init_data(sock, sk); | |
374 | ||
375 | sk->sk_destruct = inet_sock_destruct; | |
376 | sk->sk_family = PF_INET; | |
377 | sk->sk_protocol = protocol; | |
378 | sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; | |
379 | ||
380 | inet->uc_ttl = -1; | |
381 | inet->mc_loop = 1; | |
382 | inet->mc_ttl = 1; | |
383 | inet->mc_index = 0; | |
384 | inet->mc_list = NULL; | |
385 | ||
e6848976 | 386 | sk_refcnt_debug_inc(sk); |
1da177e4 LT |
387 | |
388 | if (inet->num) { | |
389 | /* It assumes that any protocol which allows | |
390 | * the user to assign a number at socket | |
391 | * creation time automatically | |
392 | * shares. | |
393 | */ | |
394 | inet->sport = htons(inet->num); | |
395 | /* Add to protocol hash chains. */ | |
396 | sk->sk_prot->hash(sk); | |
397 | } | |
398 | ||
399 | if (sk->sk_prot->init) { | |
400 | err = sk->sk_prot->init(sk); | |
401 | if (err) | |
402 | sk_common_release(sk); | |
403 | } | |
404 | out: | |
405 | return err; | |
406 | out_rcu_unlock: | |
407 | rcu_read_unlock(); | |
408 | goto out; | |
409 | } | |
410 | ||
411 | ||
412 | /* | |
413 | * The peer socket should always be NULL (or else). When we call this | |
414 | * function we are destroying the object and from then on nobody | |
415 | * should refer to it. | |
416 | */ | |
417 | int inet_release(struct socket *sock) | |
418 | { | |
419 | struct sock *sk = sock->sk; | |
420 | ||
421 | if (sk) { | |
422 | long timeout; | |
423 | ||
424 | /* Applications forget to leave groups before exiting */ | |
425 | ip_mc_drop_socket(sk); | |
426 | ||
427 | /* If linger is set, we don't return until the close | |
428 | * is complete. Otherwise we return immediately. The | |
429 | * actually closing is done the same either way. | |
430 | * | |
431 | * If the close is due to the process exiting, we never | |
432 | * linger.. | |
433 | */ | |
434 | timeout = 0; | |
435 | if (sock_flag(sk, SOCK_LINGER) && | |
436 | !(current->flags & PF_EXITING)) | |
437 | timeout = sk->sk_lingertime; | |
438 | sock->sk = NULL; | |
439 | sk->sk_prot->close(sk, timeout); | |
440 | } | |
441 | return 0; | |
442 | } | |
443 | ||
444 | /* It is off by default, see below. */ | |
ab32ea5d | 445 | int sysctl_ip_nonlocal_bind __read_mostly; |
1da177e4 LT |
446 | |
447 | int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
448 | { | |
449 | struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; | |
450 | struct sock *sk = sock->sk; | |
451 | struct inet_sock *inet = inet_sk(sk); | |
452 | unsigned short snum; | |
453 | int chk_addr_ret; | |
454 | int err; | |
455 | ||
456 | /* If the socket has its own bind function then use it. (RAW) */ | |
457 | if (sk->sk_prot->bind) { | |
458 | err = sk->sk_prot->bind(sk, uaddr, addr_len); | |
459 | goto out; | |
460 | } | |
461 | err = -EINVAL; | |
462 | if (addr_len < sizeof(struct sockaddr_in)) | |
463 | goto out; | |
464 | ||
3b1e0a65 | 465 | chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); |
1da177e4 LT |
466 | |
467 | /* Not specified by any standard per-se, however it breaks too | |
468 | * many applications when removed. It is unfortunate since | |
469 | * allowing applications to make a non-local bind solves | |
470 | * several problems with systems using dynamic addressing. | |
471 | * (ie. your servers still start up even if your ISDN link | |
472 | * is temporarily down) | |
473 | */ | |
474 | err = -EADDRNOTAVAIL; | |
475 | if (!sysctl_ip_nonlocal_bind && | |
476 | !inet->freebind && | |
e6f1cebf | 477 | addr->sin_addr.s_addr != htonl(INADDR_ANY) && |
1da177e4 LT |
478 | chk_addr_ret != RTN_LOCAL && |
479 | chk_addr_ret != RTN_MULTICAST && | |
480 | chk_addr_ret != RTN_BROADCAST) | |
481 | goto out; | |
482 | ||
483 | snum = ntohs(addr->sin_port); | |
484 | err = -EACCES; | |
485 | if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) | |
486 | goto out; | |
487 | ||
488 | /* We keep a pair of addresses. rcv_saddr is the one | |
489 | * used by hash lookups, and saddr is used for transmit. | |
490 | * | |
491 | * In the BSD API these are the same except where it | |
492 | * would be illegal to use them (multicast/broadcast) in | |
493 | * which case the sending device address is used. | |
494 | */ | |
495 | lock_sock(sk); | |
496 | ||
497 | /* Check these errors (active socket, double bind). */ | |
498 | err = -EINVAL; | |
499 | if (sk->sk_state != TCP_CLOSE || inet->num) | |
500 | goto out_release_sock; | |
501 | ||
502 | inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; | |
503 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) | |
504 | inet->saddr = 0; /* Use device */ | |
505 | ||
506 | /* Make sure we are allowed to bind here. */ | |
507 | if (sk->sk_prot->get_port(sk, snum)) { | |
508 | inet->saddr = inet->rcv_saddr = 0; | |
509 | err = -EADDRINUSE; | |
510 | goto out_release_sock; | |
511 | } | |
512 | ||
513 | if (inet->rcv_saddr) | |
514 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; | |
515 | if (snum) | |
516 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
517 | inet->sport = htons(inet->num); | |
518 | inet->daddr = 0; | |
519 | inet->dport = 0; | |
520 | sk_dst_reset(sk); | |
521 | err = 0; | |
522 | out_release_sock: | |
523 | release_sock(sk); | |
524 | out: | |
525 | return err; | |
526 | } | |
527 | ||
528 | int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, | |
529 | int addr_len, int flags) | |
530 | { | |
531 | struct sock *sk = sock->sk; | |
532 | ||
533 | if (uaddr->sa_family == AF_UNSPEC) | |
534 | return sk->sk_prot->disconnect(sk, flags); | |
535 | ||
536 | if (!inet_sk(sk)->num && inet_autobind(sk)) | |
537 | return -EAGAIN; | |
538 | return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); | |
539 | } | |
540 | ||
541 | static long inet_wait_for_connect(struct sock *sk, long timeo) | |
542 | { | |
543 | DEFINE_WAIT(wait); | |
544 | ||
545 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
546 | ||
547 | /* Basic assumption: if someone sets sk->sk_err, he _must_ | |
548 | * change state of the socket from TCP_SYN_*. | |
549 | * Connect() does not allow to get error notifications | |
550 | * without closing the socket. | |
551 | */ | |
552 | while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { | |
553 | release_sock(sk); | |
554 | timeo = schedule_timeout(timeo); | |
555 | lock_sock(sk); | |
556 | if (signal_pending(current) || !timeo) | |
557 | break; | |
558 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
559 | } | |
560 | finish_wait(sk->sk_sleep, &wait); | |
561 | return timeo; | |
562 | } | |
563 | ||
564 | /* | |
565 | * Connect to a remote host. There is regrettably still a little | |
566 | * TCP 'magic' in here. | |
567 | */ | |
568 | int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, | |
569 | int addr_len, int flags) | |
570 | { | |
571 | struct sock *sk = sock->sk; | |
572 | int err; | |
573 | long timeo; | |
574 | ||
575 | lock_sock(sk); | |
576 | ||
577 | if (uaddr->sa_family == AF_UNSPEC) { | |
578 | err = sk->sk_prot->disconnect(sk, flags); | |
579 | sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; | |
580 | goto out; | |
581 | } | |
582 | ||
583 | switch (sock->state) { | |
584 | default: | |
585 | err = -EINVAL; | |
586 | goto out; | |
587 | case SS_CONNECTED: | |
588 | err = -EISCONN; | |
589 | goto out; | |
590 | case SS_CONNECTING: | |
591 | err = -EALREADY; | |
592 | /* Fall out of switch with err, set for this state */ | |
593 | break; | |
594 | case SS_UNCONNECTED: | |
595 | err = -EISCONN; | |
596 | if (sk->sk_state != TCP_CLOSE) | |
597 | goto out; | |
598 | ||
599 | err = sk->sk_prot->connect(sk, uaddr, addr_len); | |
600 | if (err < 0) | |
601 | goto out; | |
602 | ||
e905a9ed | 603 | sock->state = SS_CONNECTING; |
1da177e4 LT |
604 | |
605 | /* Just entered SS_CONNECTING state; the only | |
606 | * difference is that return value in non-blocking | |
607 | * case is EINPROGRESS, rather than EALREADY. | |
608 | */ | |
609 | err = -EINPROGRESS; | |
610 | break; | |
611 | } | |
612 | ||
613 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); | |
614 | ||
615 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { | |
616 | /* Error code is set above */ | |
617 | if (!timeo || !inet_wait_for_connect(sk, timeo)) | |
618 | goto out; | |
619 | ||
620 | err = sock_intr_errno(timeo); | |
621 | if (signal_pending(current)) | |
622 | goto out; | |
623 | } | |
624 | ||
625 | /* Connection was closed by RST, timeout, ICMP error | |
626 | * or another process disconnected us. | |
627 | */ | |
628 | if (sk->sk_state == TCP_CLOSE) | |
629 | goto sock_error; | |
630 | ||
631 | /* sk->sk_err may be not zero now, if RECVERR was ordered by user | |
632 | * and error was received after socket entered established state. | |
633 | * Hence, it is handled normally after connect() return successfully. | |
634 | */ | |
635 | ||
636 | sock->state = SS_CONNECTED; | |
637 | err = 0; | |
638 | out: | |
639 | release_sock(sk); | |
640 | return err; | |
641 | ||
642 | sock_error: | |
643 | err = sock_error(sk) ? : -ECONNABORTED; | |
644 | sock->state = SS_UNCONNECTED; | |
645 | if (sk->sk_prot->disconnect(sk, flags)) | |
646 | sock->state = SS_DISCONNECTING; | |
647 | goto out; | |
648 | } | |
649 | ||
650 | /* | |
651 | * Accept a pending connection. The TCP layer now gives BSD semantics. | |
652 | */ | |
653 | ||
654 | int inet_accept(struct socket *sock, struct socket *newsock, int flags) | |
655 | { | |
656 | struct sock *sk1 = sock->sk; | |
657 | int err = -EINVAL; | |
658 | struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); | |
659 | ||
660 | if (!sk2) | |
661 | goto do_err; | |
662 | ||
663 | lock_sock(sk2); | |
664 | ||
665 | BUG_TRAP((1 << sk2->sk_state) & | |
666 | (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)); | |
667 | ||
668 | sock_graft(sk2, newsock); | |
669 | ||
670 | newsock->state = SS_CONNECTED; | |
671 | err = 0; | |
672 | release_sock(sk2); | |
673 | do_err: | |
674 | return err; | |
675 | } | |
676 | ||
677 | ||
678 | /* | |
679 | * This does both peername and sockname. | |
680 | */ | |
681 | int inet_getname(struct socket *sock, struct sockaddr *uaddr, | |
682 | int *uaddr_len, int peer) | |
683 | { | |
684 | struct sock *sk = sock->sk; | |
685 | struct inet_sock *inet = inet_sk(sk); | |
686 | struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; | |
687 | ||
688 | sin->sin_family = AF_INET; | |
689 | if (peer) { | |
690 | if (!inet->dport || | |
691 | (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && | |
692 | peer == 1)) | |
693 | return -ENOTCONN; | |
694 | sin->sin_port = inet->dport; | |
695 | sin->sin_addr.s_addr = inet->daddr; | |
696 | } else { | |
714e85be | 697 | __be32 addr = inet->rcv_saddr; |
1da177e4 LT |
698 | if (!addr) |
699 | addr = inet->saddr; | |
700 | sin->sin_port = inet->sport; | |
701 | sin->sin_addr.s_addr = addr; | |
702 | } | |
703 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
704 | *uaddr_len = sizeof(*sin); | |
705 | return 0; | |
706 | } | |
707 | ||
708 | int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, | |
709 | size_t size) | |
710 | { | |
711 | struct sock *sk = sock->sk; | |
712 | ||
713 | /* We may need to bind the socket. */ | |
714 | if (!inet_sk(sk)->num && inet_autobind(sk)) | |
715 | return -EAGAIN; | |
716 | ||
717 | return sk->sk_prot->sendmsg(iocb, sk, msg, size); | |
718 | } | |
719 | ||
720 | ||
721 | static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
722 | { | |
723 | struct sock *sk = sock->sk; | |
724 | ||
725 | /* We may need to bind the socket. */ | |
726 | if (!inet_sk(sk)->num && inet_autobind(sk)) | |
727 | return -EAGAIN; | |
728 | ||
729 | if (sk->sk_prot->sendpage) | |
730 | return sk->sk_prot->sendpage(sk, page, offset, size, flags); | |
731 | return sock_no_sendpage(sock, page, offset, size, flags); | |
732 | } | |
733 | ||
734 | ||
735 | int inet_shutdown(struct socket *sock, int how) | |
736 | { | |
737 | struct sock *sk = sock->sk; | |
738 | int err = 0; | |
739 | ||
740 | /* This should really check to make sure | |
741 | * the socket is a TCP socket. (WHY AC...) | |
742 | */ | |
743 | how++; /* maps 0->1 has the advantage of making bit 1 rcvs and | |
744 | 1->2 bit 2 snds. | |
745 | 2->3 */ | |
746 | if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ | |
747 | return -EINVAL; | |
748 | ||
749 | lock_sock(sk); | |
750 | if (sock->state == SS_CONNECTING) { | |
751 | if ((1 << sk->sk_state) & | |
752 | (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) | |
753 | sock->state = SS_DISCONNECTING; | |
754 | else | |
755 | sock->state = SS_CONNECTED; | |
756 | } | |
757 | ||
758 | switch (sk->sk_state) { | |
759 | case TCP_CLOSE: | |
760 | err = -ENOTCONN; | |
761 | /* Hack to wake up other listeners, who can poll for | |
762 | POLLHUP, even on eg. unconnected UDP sockets -- RR */ | |
763 | default: | |
764 | sk->sk_shutdown |= how; | |
765 | if (sk->sk_prot->shutdown) | |
766 | sk->sk_prot->shutdown(sk, how); | |
767 | break; | |
768 | ||
769 | /* Remaining two branches are temporary solution for missing | |
770 | * close() in multithreaded environment. It is _not_ a good idea, | |
771 | * but we have no choice until close() is repaired at VFS level. | |
772 | */ | |
773 | case TCP_LISTEN: | |
774 | if (!(how & RCV_SHUTDOWN)) | |
775 | break; | |
776 | /* Fall through */ | |
777 | case TCP_SYN_SENT: | |
778 | err = sk->sk_prot->disconnect(sk, O_NONBLOCK); | |
779 | sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; | |
780 | break; | |
781 | } | |
782 | ||
783 | /* Wake up anyone sleeping in poll. */ | |
784 | sk->sk_state_change(sk); | |
785 | release_sock(sk); | |
786 | return err; | |
787 | } | |
788 | ||
789 | /* | |
790 | * ioctl() calls you can issue on an INET socket. Most of these are | |
791 | * device configuration and stuff and very rarely used. Some ioctls | |
792 | * pass on to the socket itself. | |
793 | * | |
794 | * NOTE: I like the idea of a module for the config stuff. ie ifconfig | |
795 | * loads the devconfigure module does its configuring and unloads it. | |
796 | * There's a good 20K of config code hanging around the kernel. | |
797 | */ | |
798 | ||
799 | int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
800 | { | |
801 | struct sock *sk = sock->sk; | |
802 | int err = 0; | |
3b1e0a65 | 803 | struct net *net = sock_net(sk); |
1da177e4 LT |
804 | |
805 | switch (cmd) { | |
806 | case SIOCGSTAMP: | |
807 | err = sock_get_timestamp(sk, (struct timeval __user *)arg); | |
808 | break; | |
ae40eb1e ED |
809 | case SIOCGSTAMPNS: |
810 | err = sock_get_timestampns(sk, (struct timespec __user *)arg); | |
811 | break; | |
1da177e4 LT |
812 | case SIOCADDRT: |
813 | case SIOCDELRT: | |
814 | case SIOCRTMSG: | |
e5b13cb1 | 815 | err = ip_rt_ioctl(net, cmd, (void __user *)arg); |
1da177e4 LT |
816 | break; |
817 | case SIOCDARP: | |
818 | case SIOCGARP: | |
819 | case SIOCSARP: | |
e5b13cb1 | 820 | err = arp_ioctl(net, cmd, (void __user *)arg); |
1da177e4 LT |
821 | break; |
822 | case SIOCGIFADDR: | |
823 | case SIOCSIFADDR: | |
824 | case SIOCGIFBRDADDR: | |
825 | case SIOCSIFBRDADDR: | |
826 | case SIOCGIFNETMASK: | |
827 | case SIOCSIFNETMASK: | |
828 | case SIOCGIFDSTADDR: | |
829 | case SIOCSIFDSTADDR: | |
830 | case SIOCSIFPFLAGS: | |
831 | case SIOCGIFPFLAGS: | |
832 | case SIOCSIFFLAGS: | |
e5b13cb1 | 833 | err = devinet_ioctl(net, cmd, (void __user *)arg); |
1da177e4 LT |
834 | break; |
835 | default: | |
b5e5fa5e CH |
836 | if (sk->sk_prot->ioctl) |
837 | err = sk->sk_prot->ioctl(sk, cmd, arg); | |
838 | else | |
839 | err = -ENOIOCTLCMD; | |
1da177e4 LT |
840 | break; |
841 | } | |
842 | return err; | |
843 | } | |
844 | ||
90ddc4f0 | 845 | const struct proto_ops inet_stream_ops = { |
543d9cfe ACM |
846 | .family = PF_INET, |
847 | .owner = THIS_MODULE, | |
848 | .release = inet_release, | |
849 | .bind = inet_bind, | |
850 | .connect = inet_stream_connect, | |
851 | .socketpair = sock_no_socketpair, | |
852 | .accept = inet_accept, | |
853 | .getname = inet_getname, | |
854 | .poll = tcp_poll, | |
855 | .ioctl = inet_ioctl, | |
856 | .listen = inet_listen, | |
857 | .shutdown = inet_shutdown, | |
858 | .setsockopt = sock_common_setsockopt, | |
859 | .getsockopt = sock_common_getsockopt, | |
3516ffb0 | 860 | .sendmsg = tcp_sendmsg, |
543d9cfe ACM |
861 | .recvmsg = sock_common_recvmsg, |
862 | .mmap = sock_no_mmap, | |
863 | .sendpage = tcp_sendpage, | |
9c55e01c | 864 | .splice_read = tcp_splice_read, |
3fdadf7d | 865 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
866 | .compat_setsockopt = compat_sock_common_setsockopt, |
867 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 868 | #endif |
1da177e4 LT |
869 | }; |
870 | ||
90ddc4f0 | 871 | const struct proto_ops inet_dgram_ops = { |
543d9cfe ACM |
872 | .family = PF_INET, |
873 | .owner = THIS_MODULE, | |
874 | .release = inet_release, | |
875 | .bind = inet_bind, | |
876 | .connect = inet_dgram_connect, | |
877 | .socketpair = sock_no_socketpair, | |
878 | .accept = sock_no_accept, | |
879 | .getname = inet_getname, | |
880 | .poll = udp_poll, | |
881 | .ioctl = inet_ioctl, | |
882 | .listen = sock_no_listen, | |
883 | .shutdown = inet_shutdown, | |
884 | .setsockopt = sock_common_setsockopt, | |
885 | .getsockopt = sock_common_getsockopt, | |
886 | .sendmsg = inet_sendmsg, | |
887 | .recvmsg = sock_common_recvmsg, | |
888 | .mmap = sock_no_mmap, | |
889 | .sendpage = inet_sendpage, | |
3fdadf7d | 890 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
891 | .compat_setsockopt = compat_sock_common_setsockopt, |
892 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 893 | #endif |
1da177e4 LT |
894 | }; |
895 | ||
896 | /* | |
897 | * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without | |
898 | * udp_poll | |
899 | */ | |
90ddc4f0 | 900 | static const struct proto_ops inet_sockraw_ops = { |
543d9cfe ACM |
901 | .family = PF_INET, |
902 | .owner = THIS_MODULE, | |
903 | .release = inet_release, | |
904 | .bind = inet_bind, | |
905 | .connect = inet_dgram_connect, | |
906 | .socketpair = sock_no_socketpair, | |
907 | .accept = sock_no_accept, | |
908 | .getname = inet_getname, | |
909 | .poll = datagram_poll, | |
910 | .ioctl = inet_ioctl, | |
911 | .listen = sock_no_listen, | |
912 | .shutdown = inet_shutdown, | |
913 | .setsockopt = sock_common_setsockopt, | |
914 | .getsockopt = sock_common_getsockopt, | |
915 | .sendmsg = inet_sendmsg, | |
916 | .recvmsg = sock_common_recvmsg, | |
917 | .mmap = sock_no_mmap, | |
918 | .sendpage = inet_sendpage, | |
3fdadf7d | 919 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
920 | .compat_setsockopt = compat_sock_common_setsockopt, |
921 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 922 | #endif |
1da177e4 LT |
923 | }; |
924 | ||
925 | static struct net_proto_family inet_family_ops = { | |
926 | .family = PF_INET, | |
927 | .create = inet_create, | |
928 | .owner = THIS_MODULE, | |
929 | }; | |
930 | ||
1da177e4 LT |
931 | /* Upon startup we insert all the elements in inetsw_array[] into |
932 | * the linked list inetsw. | |
933 | */ | |
934 | static struct inet_protosw inetsw_array[] = | |
935 | { | |
e905a9ed YH |
936 | { |
937 | .type = SOCK_STREAM, | |
938 | .protocol = IPPROTO_TCP, | |
939 | .prot = &tcp_prot, | |
940 | .ops = &inet_stream_ops, | |
941 | .capability = -1, | |
942 | .no_check = 0, | |
943 | .flags = INET_PROTOSW_PERMANENT | | |
d83d8461 | 944 | INET_PROTOSW_ICSK, |
e905a9ed YH |
945 | }, |
946 | ||
947 | { | |
948 | .type = SOCK_DGRAM, | |
949 | .protocol = IPPROTO_UDP, | |
950 | .prot = &udp_prot, | |
951 | .ops = &inet_dgram_ops, | |
952 | .capability = -1, | |
953 | .no_check = UDP_CSUM_DEFAULT, | |
954 | .flags = INET_PROTOSW_PERMANENT, | |
1da177e4 | 955 | }, |
e905a9ed | 956 | |
1da177e4 LT |
957 | |
958 | { | |
e905a9ed YH |
959 | .type = SOCK_RAW, |
960 | .protocol = IPPROTO_IP, /* wild card */ | |
961 | .prot = &raw_prot, | |
962 | .ops = &inet_sockraw_ops, | |
963 | .capability = CAP_NET_RAW, | |
964 | .no_check = UDP_CSUM_DEFAULT, | |
965 | .flags = INET_PROTOSW_REUSE, | |
1da177e4 LT |
966 | } |
967 | }; | |
968 | ||
c40f6fff | 969 | #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) |
1da177e4 LT |
970 | |
971 | void inet_register_protosw(struct inet_protosw *p) | |
972 | { | |
973 | struct list_head *lh; | |
974 | struct inet_protosw *answer; | |
975 | int protocol = p->protocol; | |
976 | struct list_head *last_perm; | |
977 | ||
978 | spin_lock_bh(&inetsw_lock); | |
979 | ||
980 | if (p->type >= SOCK_MAX) | |
981 | goto out_illegal; | |
982 | ||
983 | /* If we are trying to override a permanent protocol, bail. */ | |
984 | answer = NULL; | |
985 | last_perm = &inetsw[p->type]; | |
986 | list_for_each(lh, &inetsw[p->type]) { | |
987 | answer = list_entry(lh, struct inet_protosw, list); | |
988 | ||
989 | /* Check only the non-wild match. */ | |
990 | if (INET_PROTOSW_PERMANENT & answer->flags) { | |
991 | if (protocol == answer->protocol) | |
992 | break; | |
993 | last_perm = lh; | |
994 | } | |
995 | ||
996 | answer = NULL; | |
997 | } | |
998 | if (answer) | |
999 | goto out_permanent; | |
1000 | ||
1001 | /* Add the new entry after the last permanent entry if any, so that | |
1002 | * the new entry does not override a permanent entry when matched with | |
1003 | * a wild-card protocol. But it is allowed to override any existing | |
e905a9ed | 1004 | * non-permanent entry. This means that when we remove this entry, the |
1da177e4 LT |
1005 | * system automatically returns to the old behavior. |
1006 | */ | |
1007 | list_add_rcu(&p->list, last_perm); | |
1008 | out: | |
1009 | spin_unlock_bh(&inetsw_lock); | |
1010 | ||
1011 | synchronize_net(); | |
1012 | ||
1013 | return; | |
1014 | ||
1015 | out_permanent: | |
1016 | printk(KERN_ERR "Attempt to override permanent protocol %d.\n", | |
1017 | protocol); | |
1018 | goto out; | |
1019 | ||
1020 | out_illegal: | |
1021 | printk(KERN_ERR | |
1022 | "Ignoring attempt to register invalid socket type %d.\n", | |
1023 | p->type); | |
1024 | goto out; | |
1025 | } | |
1026 | ||
1027 | void inet_unregister_protosw(struct inet_protosw *p) | |
1028 | { | |
1029 | if (INET_PROTOSW_PERMANENT & p->flags) { | |
1030 | printk(KERN_ERR | |
1031 | "Attempt to unregister permanent protocol %d.\n", | |
1032 | p->protocol); | |
1033 | } else { | |
1034 | spin_lock_bh(&inetsw_lock); | |
1035 | list_del_rcu(&p->list); | |
1036 | spin_unlock_bh(&inetsw_lock); | |
1037 | ||
1038 | synchronize_net(); | |
1039 | } | |
1040 | } | |
1041 | ||
32519f11 ACM |
1042 | /* |
1043 | * Shall we try to damage output packets if routing dev changes? | |
1044 | */ | |
1045 | ||
ab32ea5d | 1046 | int sysctl_ip_dynaddr __read_mostly; |
32519f11 ACM |
1047 | |
1048 | static int inet_sk_reselect_saddr(struct sock *sk) | |
1049 | { | |
1050 | struct inet_sock *inet = inet_sk(sk); | |
1051 | int err; | |
1052 | struct rtable *rt; | |
714e85be AV |
1053 | __be32 old_saddr = inet->saddr; |
1054 | __be32 new_saddr; | |
bada8adc | 1055 | __be32 daddr = inet->daddr; |
32519f11 ACM |
1056 | |
1057 | if (inet->opt && inet->opt->srr) | |
1058 | daddr = inet->opt->faddr; | |
1059 | ||
1060 | /* Query new route. */ | |
1061 | err = ip_route_connect(&rt, daddr, 0, | |
1062 | RT_CONN_FLAGS(sk), | |
1063 | sk->sk_bound_dev_if, | |
1064 | sk->sk_protocol, | |
8eb9086f | 1065 | inet->sport, inet->dport, sk, 0); |
32519f11 ACM |
1066 | if (err) |
1067 | return err; | |
1068 | ||
1069 | sk_setup_caps(sk, &rt->u.dst); | |
1070 | ||
1071 | new_saddr = rt->rt_src; | |
1072 | ||
1073 | if (new_saddr == old_saddr) | |
1074 | return 0; | |
1075 | ||
1076 | if (sysctl_ip_dynaddr > 1) { | |
1077 | printk(KERN_INFO "%s(): shifting inet->" | |
a7d632b6 | 1078 | "saddr from " NIPQUAD_FMT " to " NIPQUAD_FMT "\n", |
0dc47877 | 1079 | __func__, |
32519f11 ACM |
1080 | NIPQUAD(old_saddr), |
1081 | NIPQUAD(new_saddr)); | |
1082 | } | |
1083 | ||
1084 | inet->saddr = inet->rcv_saddr = new_saddr; | |
1085 | ||
1086 | /* | |
1087 | * XXX The only one ugly spot where we need to | |
1088 | * XXX really change the sockets identity after | |
1089 | * XXX it has entered the hashes. -DaveM | |
1090 | * | |
1091 | * Besides that, it does not check for connection | |
1092 | * uniqueness. Wait for troubles. | |
1093 | */ | |
1094 | __sk_prot_rehash(sk); | |
1095 | return 0; | |
1096 | } | |
1097 | ||
1098 | int inet_sk_rebuild_header(struct sock *sk) | |
1099 | { | |
1100 | struct inet_sock *inet = inet_sk(sk); | |
1101 | struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); | |
3ca3c68e | 1102 | __be32 daddr; |
32519f11 ACM |
1103 | int err; |
1104 | ||
1105 | /* Route is OK, nothing to do. */ | |
1106 | if (rt) | |
1107 | return 0; | |
1108 | ||
1109 | /* Reroute. */ | |
1110 | daddr = inet->daddr; | |
1111 | if (inet->opt && inet->opt->srr) | |
1112 | daddr = inet->opt->faddr; | |
1113 | { | |
1114 | struct flowi fl = { | |
1115 | .oif = sk->sk_bound_dev_if, | |
1116 | .nl_u = { | |
1117 | .ip4_u = { | |
1118 | .daddr = daddr, | |
1119 | .saddr = inet->saddr, | |
1120 | .tos = RT_CONN_FLAGS(sk), | |
1121 | }, | |
1122 | }, | |
1123 | .proto = sk->sk_protocol, | |
1124 | .uli_u = { | |
1125 | .ports = { | |
1126 | .sport = inet->sport, | |
1127 | .dport = inet->dport, | |
1128 | }, | |
1129 | }, | |
1130 | }; | |
e905a9ed | 1131 | |
beb8d13b | 1132 | security_sk_classify_flow(sk, &fl); |
3b1e0a65 | 1133 | err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0); |
32519f11 ACM |
1134 | } |
1135 | if (!err) | |
1136 | sk_setup_caps(sk, &rt->u.dst); | |
1137 | else { | |
1138 | /* Routing failed... */ | |
1139 | sk->sk_route_caps = 0; | |
1140 | /* | |
1141 | * Other protocols have to map its equivalent state to TCP_SYN_SENT. | |
1142 | * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme | |
1143 | */ | |
1144 | if (!sysctl_ip_dynaddr || | |
1145 | sk->sk_state != TCP_SYN_SENT || | |
1146 | (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || | |
1147 | (err = inet_sk_reselect_saddr(sk)) != 0) | |
1148 | sk->sk_err_soft = -err; | |
1149 | } | |
1150 | ||
1151 | return err; | |
1152 | } | |
1153 | ||
1154 | EXPORT_SYMBOL(inet_sk_rebuild_header); | |
1155 | ||
a430a43d HX |
1156 | static int inet_gso_send_check(struct sk_buff *skb) |
1157 | { | |
1158 | struct iphdr *iph; | |
1159 | struct net_protocol *ops; | |
1160 | int proto; | |
1161 | int ihl; | |
1162 | int err = -EINVAL; | |
1163 | ||
1164 | if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) | |
1165 | goto out; | |
1166 | ||
eddc9ec5 | 1167 | iph = ip_hdr(skb); |
a430a43d HX |
1168 | ihl = iph->ihl * 4; |
1169 | if (ihl < sizeof(*iph)) | |
1170 | goto out; | |
1171 | ||
1172 | if (unlikely(!pskb_may_pull(skb, ihl))) | |
1173 | goto out; | |
1174 | ||
badff6d0 ACM |
1175 | __skb_pull(skb, ihl); |
1176 | skb_reset_transport_header(skb); | |
eddc9ec5 | 1177 | iph = ip_hdr(skb); |
a430a43d HX |
1178 | proto = iph->protocol & (MAX_INET_PROTOS - 1); |
1179 | err = -EPROTONOSUPPORT; | |
1180 | ||
1181 | rcu_read_lock(); | |
1182 | ops = rcu_dereference(inet_protos[proto]); | |
1183 | if (likely(ops && ops->gso_send_check)) | |
1184 | err = ops->gso_send_check(skb); | |
1185 | rcu_read_unlock(); | |
1186 | ||
1187 | out: | |
1188 | return err; | |
1189 | } | |
1190 | ||
576a30eb | 1191 | static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features) |
f4c50d99 HX |
1192 | { |
1193 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
1194 | struct iphdr *iph; | |
1195 | struct net_protocol *ops; | |
1196 | int proto; | |
1197 | int ihl; | |
1198 | int id; | |
1199 | ||
d212f87b SH |
1200 | if (!(features & NETIF_F_V4_CSUM)) |
1201 | features &= ~NETIF_F_SG; | |
1202 | ||
bbcf467d HX |
1203 | if (unlikely(skb_shinfo(skb)->gso_type & |
1204 | ~(SKB_GSO_TCPV4 | | |
1205 | SKB_GSO_UDP | | |
1206 | SKB_GSO_DODGY | | |
1207 | SKB_GSO_TCP_ECN | | |
1208 | 0))) | |
1209 | goto out; | |
1210 | ||
1211 | if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) | |
f4c50d99 HX |
1212 | goto out; |
1213 | ||
eddc9ec5 | 1214 | iph = ip_hdr(skb); |
f4c50d99 HX |
1215 | ihl = iph->ihl * 4; |
1216 | if (ihl < sizeof(*iph)) | |
1217 | goto out; | |
1218 | ||
bbcf467d | 1219 | if (unlikely(!pskb_may_pull(skb, ihl))) |
f4c50d99 HX |
1220 | goto out; |
1221 | ||
badff6d0 ACM |
1222 | __skb_pull(skb, ihl); |
1223 | skb_reset_transport_header(skb); | |
eddc9ec5 | 1224 | iph = ip_hdr(skb); |
f4c50d99 HX |
1225 | id = ntohs(iph->id); |
1226 | proto = iph->protocol & (MAX_INET_PROTOS - 1); | |
1227 | segs = ERR_PTR(-EPROTONOSUPPORT); | |
1228 | ||
1229 | rcu_read_lock(); | |
1230 | ops = rcu_dereference(inet_protos[proto]); | |
bbcf467d | 1231 | if (likely(ops && ops->gso_segment)) |
576a30eb | 1232 | segs = ops->gso_segment(skb, features); |
f4c50d99 HX |
1233 | rcu_read_unlock(); |
1234 | ||
801678c5 | 1235 | if (!segs || IS_ERR(segs)) |
f4c50d99 HX |
1236 | goto out; |
1237 | ||
1238 | skb = segs; | |
1239 | do { | |
eddc9ec5 | 1240 | iph = ip_hdr(skb); |
f4c50d99 HX |
1241 | iph->id = htons(id++); |
1242 | iph->tot_len = htons(skb->len - skb->mac_len); | |
1243 | iph->check = 0; | |
d56f90a7 | 1244 | iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); |
f4c50d99 HX |
1245 | } while ((skb = skb->next)); |
1246 | ||
1247 | out: | |
1248 | return segs; | |
1249 | } | |
1250 | ||
eee4fe4d | 1251 | int inet_ctl_sock_create(struct sock **sk, unsigned short family, |
5677242f DL |
1252 | unsigned short type, unsigned char protocol, |
1253 | struct net *net) | |
3d58b5fa | 1254 | { |
eee4fe4d DL |
1255 | struct socket *sock; |
1256 | int rc = sock_create_kern(family, type, protocol, &sock); | |
3d58b5fa DL |
1257 | |
1258 | if (rc == 0) { | |
eee4fe4d DL |
1259 | *sk = sock->sk; |
1260 | (*sk)->sk_allocation = GFP_ATOMIC; | |
3d58b5fa DL |
1261 | /* |
1262 | * Unhash it so that IP input processing does not even see it, | |
1263 | * we do not wish this socket to see incoming packets. | |
1264 | */ | |
eee4fe4d | 1265 | (*sk)->sk_prot->unhash(*sk); |
5677242f DL |
1266 | |
1267 | sk_change_net(*sk, net); | |
3d58b5fa DL |
1268 | } |
1269 | return rc; | |
1270 | } | |
1271 | ||
1272 | EXPORT_SYMBOL_GPL(inet_ctl_sock_create); | |
1273 | ||
5e0f0435 HX |
1274 | unsigned long snmp_fold_field(void *mib[], int offt) |
1275 | { | |
1276 | unsigned long res = 0; | |
1277 | int i; | |
1278 | ||
1279 | for_each_possible_cpu(i) { | |
1280 | res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); | |
1281 | res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); | |
1282 | } | |
1283 | return res; | |
1284 | } | |
1285 | EXPORT_SYMBOL_GPL(snmp_fold_field); | |
1286 | ||
c69bce20 | 1287 | int snmp_mib_init(void *ptr[2], size_t mibsize) |
5e0f0435 HX |
1288 | { |
1289 | BUG_ON(ptr == NULL); | |
1290 | ptr[0] = __alloc_percpu(mibsize); | |
1291 | if (!ptr[0]) | |
1292 | goto err0; | |
1293 | ptr[1] = __alloc_percpu(mibsize); | |
1294 | if (!ptr[1]) | |
1295 | goto err1; | |
1296 | return 0; | |
1297 | err1: | |
1298 | free_percpu(ptr[0]); | |
1299 | ptr[0] = NULL; | |
1300 | err0: | |
1301 | return -ENOMEM; | |
1302 | } | |
1303 | EXPORT_SYMBOL_GPL(snmp_mib_init); | |
1304 | ||
1305 | void snmp_mib_free(void *ptr[2]) | |
1306 | { | |
1307 | BUG_ON(ptr == NULL); | |
1308 | free_percpu(ptr[0]); | |
1309 | free_percpu(ptr[1]); | |
1310 | ptr[0] = ptr[1] = NULL; | |
1311 | } | |
1312 | EXPORT_SYMBOL_GPL(snmp_mib_free); | |
1313 | ||
1da177e4 LT |
1314 | #ifdef CONFIG_IP_MULTICAST |
1315 | static struct net_protocol igmp_protocol = { | |
1316 | .handler = igmp_rcv, | |
1317 | }; | |
1318 | #endif | |
1319 | ||
1320 | static struct net_protocol tcp_protocol = { | |
1321 | .handler = tcp_v4_rcv, | |
1322 | .err_handler = tcp_v4_err, | |
a430a43d | 1323 | .gso_send_check = tcp_v4_gso_send_check, |
f4c50d99 | 1324 | .gso_segment = tcp_tso_segment, |
1da177e4 | 1325 | .no_policy = 1, |
92f1fecb | 1326 | .netns_ok = 1, |
1da177e4 LT |
1327 | }; |
1328 | ||
1329 | static struct net_protocol udp_protocol = { | |
1330 | .handler = udp_rcv, | |
1331 | .err_handler = udp_err, | |
1332 | .no_policy = 1, | |
92f1fecb | 1333 | .netns_ok = 1, |
1da177e4 LT |
1334 | }; |
1335 | ||
1336 | static struct net_protocol icmp_protocol = { | |
1337 | .handler = icmp_rcv, | |
8b7817f3 | 1338 | .no_policy = 1, |
92f1fecb | 1339 | .netns_ok = 1, |
1da177e4 LT |
1340 | }; |
1341 | ||
1342 | static int __init init_ipv4_mibs(void) | |
1343 | { | |
33490170 | 1344 | if (snmp_mib_init((void **)net_statistics, |
c69bce20 | 1345 | sizeof(struct linux_mib)) < 0) |
33490170 YH |
1346 | goto err_net_mib; |
1347 | if (snmp_mib_init((void **)ip_statistics, | |
c69bce20 | 1348 | sizeof(struct ipstats_mib)) < 0) |
33490170 YH |
1349 | goto err_ip_mib; |
1350 | if (snmp_mib_init((void **)icmp_statistics, | |
c69bce20 | 1351 | sizeof(struct icmp_mib)) < 0) |
33490170 | 1352 | goto err_icmp_mib; |
96793b48 | 1353 | if (snmp_mib_init((void **)icmpmsg_statistics, |
c69bce20 | 1354 | sizeof(struct icmpmsg_mib)) < 0) |
96793b48 | 1355 | goto err_icmpmsg_mib; |
33490170 | 1356 | if (snmp_mib_init((void **)tcp_statistics, |
c69bce20 | 1357 | sizeof(struct tcp_mib)) < 0) |
33490170 YH |
1358 | goto err_tcp_mib; |
1359 | if (snmp_mib_init((void **)udp_statistics, | |
c69bce20 | 1360 | sizeof(struct udp_mib)) < 0) |
33490170 YH |
1361 | goto err_udp_mib; |
1362 | if (snmp_mib_init((void **)udplite_statistics, | |
c69bce20 | 1363 | sizeof(struct udp_mib)) < 0) |
33490170 | 1364 | goto err_udplite_mib; |
db8dac20 | 1365 | |
33490170 | 1366 | tcp_mib_init(); |
1da177e4 LT |
1367 | |
1368 | return 0; | |
33490170 YH |
1369 | |
1370 | err_udplite_mib: | |
1371 | snmp_mib_free((void **)udp_statistics); | |
1372 | err_udp_mib: | |
1373 | snmp_mib_free((void **)tcp_statistics); | |
1374 | err_tcp_mib: | |
96793b48 DS |
1375 | snmp_mib_free((void **)icmpmsg_statistics); |
1376 | err_icmpmsg_mib: | |
33490170 YH |
1377 | snmp_mib_free((void **)icmp_statistics); |
1378 | err_icmp_mib: | |
1379 | snmp_mib_free((void **)ip_statistics); | |
1380 | err_ip_mib: | |
1381 | snmp_mib_free((void **)net_statistics); | |
1382 | err_net_mib: | |
1383 | return -ENOMEM; | |
1da177e4 LT |
1384 | } |
1385 | ||
1386 | static int ipv4_proc_init(void); | |
1da177e4 | 1387 | |
30e224d7 HX |
1388 | /* |
1389 | * IP protocol layer initialiser | |
1390 | */ | |
1391 | ||
1392 | static struct packet_type ip_packet_type = { | |
1393 | .type = __constant_htons(ETH_P_IP), | |
1394 | .func = ip_rcv, | |
a430a43d | 1395 | .gso_send_check = inet_gso_send_check, |
f4c50d99 | 1396 | .gso_segment = inet_gso_segment, |
30e224d7 HX |
1397 | }; |
1398 | ||
1da177e4 LT |
1399 | static int __init inet_init(void) |
1400 | { | |
1401 | struct sk_buff *dummy_skb; | |
1402 | struct inet_protosw *q; | |
1403 | struct list_head *r; | |
1404 | int rc = -EINVAL; | |
1405 | ||
ef047f5e | 1406 | BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); |
1da177e4 LT |
1407 | |
1408 | rc = proto_register(&tcp_prot, 1); | |
1409 | if (rc) | |
1410 | goto out; | |
1411 | ||
1412 | rc = proto_register(&udp_prot, 1); | |
1413 | if (rc) | |
1414 | goto out_unregister_tcp_proto; | |
1415 | ||
1416 | rc = proto_register(&raw_prot, 1); | |
1417 | if (rc) | |
1418 | goto out_unregister_udp_proto; | |
1419 | ||
1420 | /* | |
e905a9ed | 1421 | * Tell SOCKET that we are alive... |
1da177e4 LT |
1422 | */ |
1423 | ||
e905a9ed | 1424 | (void)sock_register(&inet_family_ops); |
1da177e4 LT |
1425 | |
1426 | /* | |
1427 | * Add all the base protocols. | |
1428 | */ | |
1429 | ||
1430 | if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) | |
1431 | printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); | |
1432 | if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) | |
1433 | printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); | |
1434 | if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) | |
1435 | printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); | |
1436 | #ifdef CONFIG_IP_MULTICAST | |
1437 | if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) | |
1438 | printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); | |
1439 | #endif | |
1440 | ||
1441 | /* Register the socket-side information for inet_create. */ | |
1442 | for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) | |
1443 | INIT_LIST_HEAD(r); | |
1444 | ||
1445 | for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) | |
1446 | inet_register_protosw(q); | |
1447 | ||
1448 | /* | |
1449 | * Set the ARP module up | |
1450 | */ | |
1451 | ||
1452 | arp_init(); | |
1453 | ||
e905a9ed YH |
1454 | /* |
1455 | * Set the IP module up | |
1456 | */ | |
1da177e4 LT |
1457 | |
1458 | ip_init(); | |
1459 | ||
9b0f976f | 1460 | tcp_v4_init(); |
1da177e4 LT |
1461 | |
1462 | /* Setup TCP slab cache for open requests. */ | |
1463 | tcp_init(); | |
1464 | ||
95766fff HA |
1465 | /* Setup UDP memory threshold */ |
1466 | udp_init(); | |
1467 | ||
ba4e58ec GR |
1468 | /* Add UDP-Lite (RFC 3828) */ |
1469 | udplite4_register(); | |
1da177e4 LT |
1470 | |
1471 | /* | |
1472 | * Set the ICMP layer up | |
1473 | */ | |
1474 | ||
a5710d65 DL |
1475 | if (icmp_init() < 0) |
1476 | panic("Failed to create the ICMP control socket.\n"); | |
1da177e4 LT |
1477 | |
1478 | /* | |
1479 | * Initialise the multicast router | |
1480 | */ | |
1481 | #if defined(CONFIG_IP_MROUTE) | |
03d2f897 WC |
1482 | if (ip_mr_init()) |
1483 | printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n"); | |
1da177e4 LT |
1484 | #endif |
1485 | /* | |
1486 | * Initialise per-cpu ipv4 mibs | |
e905a9ed | 1487 | */ |
1da177e4 | 1488 | |
132adf54 | 1489 | if (init_ipv4_mibs()) |
03d2f897 | 1490 | printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); |
e905a9ed | 1491 | |
1da177e4 LT |
1492 | ipv4_proc_init(); |
1493 | ||
1494 | ipfrag_init(); | |
1495 | ||
30e224d7 HX |
1496 | dev_add_pack(&ip_packet_type); |
1497 | ||
1da177e4 LT |
1498 | rc = 0; |
1499 | out: | |
1500 | return rc; | |
1da177e4 LT |
1501 | out_unregister_udp_proto: |
1502 | proto_unregister(&udp_prot); | |
321efff7 OK |
1503 | out_unregister_tcp_proto: |
1504 | proto_unregister(&tcp_prot); | |
1da177e4 LT |
1505 | goto out; |
1506 | } | |
1507 | ||
a536e077 | 1508 | fs_initcall(inet_init); |
1da177e4 LT |
1509 | |
1510 | /* ------------------------------------------------------------------------ */ | |
1511 | ||
1512 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
1513 | static int __init ipv4_proc_init(void) |
1514 | { | |
1515 | int rc = 0; | |
1516 | ||
1517 | if (raw_proc_init()) | |
1518 | goto out_raw; | |
1519 | if (tcp4_proc_init()) | |
1520 | goto out_tcp; | |
1521 | if (udp4_proc_init()) | |
1522 | goto out_udp; | |
1da177e4 LT |
1523 | if (ip_misc_proc_init()) |
1524 | goto out_misc; | |
1525 | out: | |
1526 | return rc; | |
1527 | out_misc: | |
1da177e4 LT |
1528 | udp4_proc_exit(); |
1529 | out_udp: | |
1530 | tcp4_proc_exit(); | |
1531 | out_tcp: | |
1532 | raw_proc_exit(); | |
1533 | out_raw: | |
1534 | rc = -ENOMEM; | |
1535 | goto out; | |
1536 | } | |
1537 | ||
1538 | #else /* CONFIG_PROC_FS */ | |
1539 | static int __init ipv4_proc_init(void) | |
1540 | { | |
1541 | return 0; | |
1542 | } | |
1543 | #endif /* CONFIG_PROC_FS */ | |
1544 | ||
1545 | MODULE_ALIAS_NETPROTO(PF_INET); | |
1546 | ||
1547 | EXPORT_SYMBOL(inet_accept); | |
1548 | EXPORT_SYMBOL(inet_bind); | |
1549 | EXPORT_SYMBOL(inet_dgram_connect); | |
1550 | EXPORT_SYMBOL(inet_dgram_ops); | |
1551 | EXPORT_SYMBOL(inet_getname); | |
1552 | EXPORT_SYMBOL(inet_ioctl); | |
1553 | EXPORT_SYMBOL(inet_listen); | |
1554 | EXPORT_SYMBOL(inet_register_protosw); | |
1555 | EXPORT_SYMBOL(inet_release); | |
1556 | EXPORT_SYMBOL(inet_sendmsg); | |
1557 | EXPORT_SYMBOL(inet_shutdown); | |
1558 | EXPORT_SYMBOL(inet_sock_destruct); | |
1559 | EXPORT_SYMBOL(inet_stream_connect); | |
1560 | EXPORT_SYMBOL(inet_stream_ops); | |
1561 | EXPORT_SYMBOL(inet_unregister_protosw); | |
1562 | EXPORT_SYMBOL(net_statistics); | |
cdac4e07 | 1563 | EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); |