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Commit | Line | Data |
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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 | * | |
8 | * Authors: Ross Biro | |
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 | ||
68 | #define pr_fmt(fmt) "IPv4: " fmt | |
69 | ||
70 | #include <linux/err.h> | |
71 | #include <linux/errno.h> | |
72 | #include <linux/types.h> | |
73 | #include <linux/socket.h> | |
74 | #include <linux/in.h> | |
75 | #include <linux/kernel.h> | |
76 | #include <linux/kmod.h> | |
77 | #include <linux/sched.h> | |
78 | #include <linux/timer.h> | |
79 | #include <linux/string.h> | |
80 | #include <linux/sockios.h> | |
81 | #include <linux/net.h> | |
82 | #include <linux/capability.h> | |
83 | #include <linux/fcntl.h> | |
84 | #include <linux/mm.h> | |
85 | #include <linux/interrupt.h> | |
86 | #include <linux/stat.h> | |
87 | #include <linux/init.h> | |
88 | #include <linux/poll.h> | |
89 | #include <linux/netfilter_ipv4.h> | |
90 | #include <linux/random.h> | |
91 | #include <linux/slab.h> | |
92 | ||
93 | #include <linux/uaccess.h> | |
94 | ||
95 | #include <linux/inet.h> | |
96 | #include <linux/igmp.h> | |
97 | #include <linux/inetdevice.h> | |
98 | #include <linux/netdevice.h> | |
99 | #include <net/checksum.h> | |
100 | #include <net/ip.h> | |
101 | #include <net/protocol.h> | |
102 | #include <net/arp.h> | |
103 | #include <net/route.h> | |
104 | #include <net/ip_fib.h> | |
105 | #include <net/inet_connection_sock.h> | |
106 | #include <net/tcp.h> | |
107 | #include <net/udp.h> | |
108 | #include <net/udplite.h> | |
109 | #include <net/ping.h> | |
110 | #include <linux/skbuff.h> | |
111 | #include <net/sock.h> | |
112 | #include <net/raw.h> | |
113 | #include <net/icmp.h> | |
114 | #include <net/inet_common.h> | |
115 | #include <net/ip_tunnels.h> | |
116 | #include <net/xfrm.h> | |
117 | #include <net/net_namespace.h> | |
118 | #include <net/secure_seq.h> | |
119 | #ifdef CONFIG_IP_MROUTE | |
120 | #include <linux/mroute.h> | |
121 | #endif | |
122 | #include <net/l3mdev.h> | |
123 | ||
124 | ||
125 | /* The inetsw table contains everything that inet_create needs to | |
126 | * build a new socket. | |
127 | */ | |
128 | static struct list_head inetsw[SOCK_MAX]; | |
129 | static DEFINE_SPINLOCK(inetsw_lock); | |
130 | ||
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 | ||
140 | sk_mem_reclaim(sk); | |
141 | ||
142 | if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { | |
143 | pr_err("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 | pr_err("Attempt to release alive inet socket %p\n", sk); | |
149 | return; | |
150 | } | |
151 | ||
152 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); | |
153 | WARN_ON(refcount_read(&sk->sk_wmem_alloc)); | |
154 | WARN_ON(sk->sk_wmem_queued); | |
155 | WARN_ON(sk->sk_forward_alloc); | |
156 | ||
157 | kfree(rcu_dereference_protected(inet->inet_opt, 1)); | |
158 | dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); | |
159 | dst_release(sk->sk_rx_dst); | |
160 | sk_refcnt_debug_dec(sk); | |
161 | } | |
162 | EXPORT_SYMBOL(inet_sock_destruct); | |
163 | ||
164 | /* | |
165 | * The routines beyond this point handle the behaviour of an AF_INET | |
166 | * socket object. Mostly it punts to the subprotocols of IP to do | |
167 | * the work. | |
168 | */ | |
169 | ||
170 | /* | |
171 | * Automatically bind an unbound socket. | |
172 | */ | |
173 | ||
174 | static int inet_autobind(struct sock *sk) | |
175 | { | |
176 | struct inet_sock *inet; | |
177 | /* We may need to bind the socket. */ | |
178 | lock_sock(sk); | |
179 | inet = inet_sk(sk); | |
180 | if (!inet->inet_num) { | |
181 | if (sk->sk_prot->get_port(sk, 0)) { | |
182 | release_sock(sk); | |
183 | return -EAGAIN; | |
184 | } | |
185 | inet->inet_sport = htons(inet->inet_num); | |
186 | } | |
187 | release_sock(sk); | |
188 | return 0; | |
189 | } | |
190 | ||
191 | /* | |
192 | * Move a socket into listening state. | |
193 | */ | |
194 | int inet_listen(struct socket *sock, int backlog) | |
195 | { | |
196 | struct sock *sk = sock->sk; | |
197 | unsigned char old_state; | |
198 | int err; | |
199 | ||
200 | lock_sock(sk); | |
201 | ||
202 | err = -EINVAL; | |
203 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) | |
204 | goto out; | |
205 | ||
206 | old_state = sk->sk_state; | |
207 | if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) | |
208 | goto out; | |
209 | ||
210 | /* Really, if the socket is already in listen state | |
211 | * we can only allow the backlog to be adjusted. | |
212 | */ | |
213 | if (old_state != TCP_LISTEN) { | |
214 | /* Enable TFO w/o requiring TCP_FASTOPEN socket option. | |
215 | * Note that only TCP sockets (SOCK_STREAM) will reach here. | |
216 | * Also fastopen backlog may already been set via the option | |
217 | * because the socket was in TCP_LISTEN state previously but | |
218 | * was shutdown() rather than close(). | |
219 | */ | |
220 | if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) && | |
221 | (sysctl_tcp_fastopen & TFO_SERVER_ENABLE) && | |
222 | !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) { | |
223 | fastopen_queue_tune(sk, backlog); | |
224 | tcp_fastopen_init_key_once(true); | |
225 | } | |
226 | ||
227 | err = inet_csk_listen_start(sk, backlog); | |
228 | if (err) | |
229 | goto out; | |
230 | } | |
231 | sk->sk_max_ack_backlog = backlog; | |
232 | err = 0; | |
233 | ||
234 | out: | |
235 | release_sock(sk); | |
236 | return err; | |
237 | } | |
238 | EXPORT_SYMBOL(inet_listen); | |
239 | ||
240 | /* | |
241 | * Create an inet socket. | |
242 | */ | |
243 | ||
244 | static int inet_create(struct net *net, struct socket *sock, int protocol, | |
245 | int kern) | |
246 | { | |
247 | struct sock *sk; | |
248 | struct inet_protosw *answer; | |
249 | struct inet_sock *inet; | |
250 | struct proto *answer_prot; | |
251 | unsigned char answer_flags; | |
252 | int try_loading_module = 0; | |
253 | int err; | |
254 | ||
255 | if (protocol < 0 || protocol >= IPPROTO_MAX) | |
256 | return -EINVAL; | |
257 | ||
258 | sock->state = SS_UNCONNECTED; | |
259 | ||
260 | /* Look for the requested type/protocol pair. */ | |
261 | lookup_protocol: | |
262 | err = -ESOCKTNOSUPPORT; | |
263 | rcu_read_lock(); | |
264 | list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { | |
265 | ||
266 | err = 0; | |
267 | /* Check the non-wild match. */ | |
268 | if (protocol == answer->protocol) { | |
269 | if (protocol != IPPROTO_IP) | |
270 | break; | |
271 | } else { | |
272 | /* Check for the two wild cases. */ | |
273 | if (IPPROTO_IP == protocol) { | |
274 | protocol = answer->protocol; | |
275 | break; | |
276 | } | |
277 | if (IPPROTO_IP == answer->protocol) | |
278 | break; | |
279 | } | |
280 | err = -EPROTONOSUPPORT; | |
281 | } | |
282 | ||
283 | if (unlikely(err)) { | |
284 | if (try_loading_module < 2) { | |
285 | rcu_read_unlock(); | |
286 | /* | |
287 | * Be more specific, e.g. net-pf-2-proto-132-type-1 | |
288 | * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) | |
289 | */ | |
290 | if (++try_loading_module == 1) | |
291 | request_module("net-pf-%d-proto-%d-type-%d", | |
292 | PF_INET, protocol, sock->type); | |
293 | /* | |
294 | * Fall back to generic, e.g. net-pf-2-proto-132 | |
295 | * (net-pf-PF_INET-proto-IPPROTO_SCTP) | |
296 | */ | |
297 | else | |
298 | request_module("net-pf-%d-proto-%d", | |
299 | PF_INET, protocol); | |
300 | goto lookup_protocol; | |
301 | } else | |
302 | goto out_rcu_unlock; | |
303 | } | |
304 | ||
305 | err = -EPERM; | |
306 | if (sock->type == SOCK_RAW && !kern && | |
307 | !ns_capable(net->user_ns, CAP_NET_RAW)) | |
308 | goto out_rcu_unlock; | |
309 | ||
310 | sock->ops = answer->ops; | |
311 | answer_prot = answer->prot; | |
312 | answer_flags = answer->flags; | |
313 | rcu_read_unlock(); | |
314 | ||
315 | WARN_ON(!answer_prot->slab); | |
316 | ||
317 | err = -ENOBUFS; | |
318 | sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern); | |
319 | if (!sk) | |
320 | goto out; | |
321 | ||
322 | err = 0; | |
323 | if (INET_PROTOSW_REUSE & answer_flags) | |
324 | sk->sk_reuse = SK_CAN_REUSE; | |
325 | ||
326 | inet = inet_sk(sk); | |
327 | inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; | |
328 | ||
329 | inet->nodefrag = 0; | |
330 | ||
331 | if (SOCK_RAW == sock->type) { | |
332 | inet->inet_num = protocol; | |
333 | if (IPPROTO_RAW == protocol) | |
334 | inet->hdrincl = 1; | |
335 | } | |
336 | ||
337 | if (net->ipv4.sysctl_ip_no_pmtu_disc) | |
338 | inet->pmtudisc = IP_PMTUDISC_DONT; | |
339 | else | |
340 | inet->pmtudisc = IP_PMTUDISC_WANT; | |
341 | ||
342 | inet->inet_id = 0; | |
343 | ||
344 | sock_init_data(sock, sk); | |
345 | ||
346 | sk->sk_destruct = inet_sock_destruct; | |
347 | sk->sk_protocol = protocol; | |
348 | sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; | |
349 | ||
350 | inet->uc_ttl = -1; | |
351 | inet->mc_loop = 1; | |
352 | inet->mc_ttl = 1; | |
353 | inet->mc_all = 1; | |
354 | inet->mc_index = 0; | |
355 | inet->mc_list = NULL; | |
356 | inet->rcv_tos = 0; | |
357 | ||
358 | sk_refcnt_debug_inc(sk); | |
359 | ||
360 | if (inet->inet_num) { | |
361 | /* It assumes that any protocol which allows | |
362 | * the user to assign a number at socket | |
363 | * creation time automatically | |
364 | * shares. | |
365 | */ | |
366 | inet->inet_sport = htons(inet->inet_num); | |
367 | /* Add to protocol hash chains. */ | |
368 | err = sk->sk_prot->hash(sk); | |
369 | if (err) { | |
370 | sk_common_release(sk); | |
371 | goto out; | |
372 | } | |
373 | } | |
374 | ||
375 | if (sk->sk_prot->init) { | |
376 | err = sk->sk_prot->init(sk); | |
377 | if (err) { | |
378 | sk_common_release(sk); | |
379 | goto out; | |
380 | } | |
381 | } | |
382 | ||
383 | if (!kern) { | |
384 | err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); | |
385 | if (err) { | |
386 | sk_common_release(sk); | |
387 | goto out; | |
388 | } | |
389 | } | |
390 | out: | |
391 | return err; | |
392 | out_rcu_unlock: | |
393 | rcu_read_unlock(); | |
394 | goto out; | |
395 | } | |
396 | ||
397 | ||
398 | /* | |
399 | * The peer socket should always be NULL (or else). When we call this | |
400 | * function we are destroying the object and from then on nobody | |
401 | * should refer to it. | |
402 | */ | |
403 | int inet_release(struct socket *sock) | |
404 | { | |
405 | struct sock *sk = sock->sk; | |
406 | ||
407 | if (sk) { | |
408 | long timeout; | |
409 | ||
410 | /* Applications forget to leave groups before exiting */ | |
411 | ip_mc_drop_socket(sk); | |
412 | ||
413 | /* If linger is set, we don't return until the close | |
414 | * is complete. Otherwise we return immediately. The | |
415 | * actually closing is done the same either way. | |
416 | * | |
417 | * If the close is due to the process exiting, we never | |
418 | * linger.. | |
419 | */ | |
420 | timeout = 0; | |
421 | if (sock_flag(sk, SOCK_LINGER) && | |
422 | !(current->flags & PF_EXITING)) | |
423 | timeout = sk->sk_lingertime; | |
424 | sock->sk = NULL; | |
425 | sk->sk_prot->close(sk, timeout); | |
426 | } | |
427 | return 0; | |
428 | } | |
429 | EXPORT_SYMBOL(inet_release); | |
430 | ||
431 | int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
432 | { | |
433 | struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; | |
434 | struct sock *sk = sock->sk; | |
435 | struct inet_sock *inet = inet_sk(sk); | |
436 | struct net *net = sock_net(sk); | |
437 | unsigned short snum; | |
438 | int chk_addr_ret; | |
439 | u32 tb_id = RT_TABLE_LOCAL; | |
440 | int err; | |
441 | ||
442 | /* If the socket has its own bind function then use it. (RAW) */ | |
443 | if (sk->sk_prot->bind) { | |
444 | err = sk->sk_prot->bind(sk, uaddr, addr_len); | |
445 | goto out; | |
446 | } | |
447 | err = -EINVAL; | |
448 | if (addr_len < sizeof(struct sockaddr_in)) | |
449 | goto out; | |
450 | ||
451 | if (addr->sin_family != AF_INET) { | |
452 | /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) | |
453 | * only if s_addr is INADDR_ANY. | |
454 | */ | |
455 | err = -EAFNOSUPPORT; | |
456 | if (addr->sin_family != AF_UNSPEC || | |
457 | addr->sin_addr.s_addr != htonl(INADDR_ANY)) | |
458 | goto out; | |
459 | } | |
460 | ||
461 | tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id; | |
462 | chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); | |
463 | ||
464 | /* Not specified by any standard per-se, however it breaks too | |
465 | * many applications when removed. It is unfortunate since | |
466 | * allowing applications to make a non-local bind solves | |
467 | * several problems with systems using dynamic addressing. | |
468 | * (ie. your servers still start up even if your ISDN link | |
469 | * is temporarily down) | |
470 | */ | |
471 | err = -EADDRNOTAVAIL; | |
472 | if (!net->ipv4.sysctl_ip_nonlocal_bind && | |
473 | !(inet->freebind || inet->transparent) && | |
474 | addr->sin_addr.s_addr != htonl(INADDR_ANY) && | |
475 | chk_addr_ret != RTN_LOCAL && | |
476 | chk_addr_ret != RTN_MULTICAST && | |
477 | chk_addr_ret != RTN_BROADCAST) | |
478 | goto out; | |
479 | ||
480 | snum = ntohs(addr->sin_port); | |
481 | err = -EACCES; | |
482 | if (snum && snum < inet_prot_sock(net) && | |
483 | !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) | |
484 | goto out; | |
485 | ||
486 | /* We keep a pair of addresses. rcv_saddr is the one | |
487 | * used by hash lookups, and saddr is used for transmit. | |
488 | * | |
489 | * In the BSD API these are the same except where it | |
490 | * would be illegal to use them (multicast/broadcast) in | |
491 | * which case the sending device address is used. | |
492 | */ | |
493 | lock_sock(sk); | |
494 | ||
495 | /* Check these errors (active socket, double bind). */ | |
496 | err = -EINVAL; | |
497 | if (sk->sk_state != TCP_CLOSE || inet->inet_num) | |
498 | goto out_release_sock; | |
499 | ||
500 | inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; | |
501 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) | |
502 | inet->inet_saddr = 0; /* Use device */ | |
503 | ||
504 | /* Make sure we are allowed to bind here. */ | |
505 | if ((snum || !inet->bind_address_no_port) && | |
506 | sk->sk_prot->get_port(sk, snum)) { | |
507 | inet->inet_saddr = inet->inet_rcv_saddr = 0; | |
508 | err = -EADDRINUSE; | |
509 | goto out_release_sock; | |
510 | } | |
511 | ||
512 | if (inet->inet_rcv_saddr) | |
513 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; | |
514 | if (snum) | |
515 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
516 | inet->inet_sport = htons(inet->inet_num); | |
517 | inet->inet_daddr = 0; | |
518 | inet->inet_dport = 0; | |
519 | sk_dst_reset(sk); | |
520 | err = 0; | |
521 | out_release_sock: | |
522 | release_sock(sk); | |
523 | out: | |
524 | return err; | |
525 | } | |
526 | EXPORT_SYMBOL(inet_bind); | |
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 (addr_len < sizeof(uaddr->sa_family)) | |
534 | return -EINVAL; | |
535 | if (uaddr->sa_family == AF_UNSPEC) | |
536 | return sk->sk_prot->disconnect(sk, flags); | |
537 | ||
538 | if (!inet_sk(sk)->inet_num && inet_autobind(sk)) | |
539 | return -EAGAIN; | |
540 | return sk->sk_prot->connect(sk, uaddr, addr_len); | |
541 | } | |
542 | EXPORT_SYMBOL(inet_dgram_connect); | |
543 | ||
544 | static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) | |
545 | { | |
546 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
547 | ||
548 | add_wait_queue(sk_sleep(sk), &wait); | |
549 | sk->sk_write_pending += writebias; | |
550 | ||
551 | /* Basic assumption: if someone sets sk->sk_err, he _must_ | |
552 | * change state of the socket from TCP_SYN_*. | |
553 | * Connect() does not allow to get error notifications | |
554 | * without closing the socket. | |
555 | */ | |
556 | while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { | |
557 | release_sock(sk); | |
558 | timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); | |
559 | lock_sock(sk); | |
560 | if (signal_pending(current) || !timeo) | |
561 | break; | |
562 | } | |
563 | remove_wait_queue(sk_sleep(sk), &wait); | |
564 | sk->sk_write_pending -= writebias; | |
565 | return timeo; | |
566 | } | |
567 | ||
568 | /* | |
569 | * Connect to a remote host. There is regrettably still a little | |
570 | * TCP 'magic' in here. | |
571 | */ | |
572 | int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, | |
573 | int addr_len, int flags, int is_sendmsg) | |
574 | { | |
575 | struct sock *sk = sock->sk; | |
576 | int err; | |
577 | long timeo; | |
578 | ||
579 | /* | |
580 | * uaddr can be NULL and addr_len can be 0 if: | |
581 | * sk is a TCP fastopen active socket and | |
582 | * TCP_FASTOPEN_CONNECT sockopt is set and | |
583 | * we already have a valid cookie for this socket. | |
584 | * In this case, user can call write() after connect(). | |
585 | * write() will invoke tcp_sendmsg_fastopen() which calls | |
586 | * __inet_stream_connect(). | |
587 | */ | |
588 | if (uaddr) { | |
589 | if (addr_len < sizeof(uaddr->sa_family)) | |
590 | return -EINVAL; | |
591 | ||
592 | if (uaddr->sa_family == AF_UNSPEC) { | |
593 | err = sk->sk_prot->disconnect(sk, flags); | |
594 | sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; | |
595 | goto out; | |
596 | } | |
597 | } | |
598 | ||
599 | switch (sock->state) { | |
600 | default: | |
601 | err = -EINVAL; | |
602 | goto out; | |
603 | case SS_CONNECTED: | |
604 | err = -EISCONN; | |
605 | goto out; | |
606 | case SS_CONNECTING: | |
607 | if (inet_sk(sk)->defer_connect) | |
608 | err = is_sendmsg ? -EINPROGRESS : -EISCONN; | |
609 | else | |
610 | err = -EALREADY; | |
611 | /* Fall out of switch with err, set for this state */ | |
612 | break; | |
613 | case SS_UNCONNECTED: | |
614 | err = -EISCONN; | |
615 | if (sk->sk_state != TCP_CLOSE) | |
616 | goto out; | |
617 | ||
618 | err = sk->sk_prot->connect(sk, uaddr, addr_len); | |
619 | if (err < 0) | |
620 | goto out; | |
621 | ||
622 | sock->state = SS_CONNECTING; | |
623 | ||
624 | if (!err && inet_sk(sk)->defer_connect) | |
625 | goto out; | |
626 | ||
627 | /* Just entered SS_CONNECTING state; the only | |
628 | * difference is that return value in non-blocking | |
629 | * case is EINPROGRESS, rather than EALREADY. | |
630 | */ | |
631 | err = -EINPROGRESS; | |
632 | break; | |
633 | } | |
634 | ||
635 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); | |
636 | ||
637 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { | |
638 | int writebias = (sk->sk_protocol == IPPROTO_TCP) && | |
639 | tcp_sk(sk)->fastopen_req && | |
640 | tcp_sk(sk)->fastopen_req->data ? 1 : 0; | |
641 | ||
642 | /* Error code is set above */ | |
643 | if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) | |
644 | goto out; | |
645 | ||
646 | err = sock_intr_errno(timeo); | |
647 | if (signal_pending(current)) | |
648 | goto out; | |
649 | } | |
650 | ||
651 | /* Connection was closed by RST, timeout, ICMP error | |
652 | * or another process disconnected us. | |
653 | */ | |
654 | if (sk->sk_state == TCP_CLOSE) | |
655 | goto sock_error; | |
656 | ||
657 | /* sk->sk_err may be not zero now, if RECVERR was ordered by user | |
658 | * and error was received after socket entered established state. | |
659 | * Hence, it is handled normally after connect() return successfully. | |
660 | */ | |
661 | ||
662 | sock->state = SS_CONNECTED; | |
663 | err = 0; | |
664 | out: | |
665 | return err; | |
666 | ||
667 | sock_error: | |
668 | err = sock_error(sk) ? : -ECONNABORTED; | |
669 | sock->state = SS_UNCONNECTED; | |
670 | if (sk->sk_prot->disconnect(sk, flags)) | |
671 | sock->state = SS_DISCONNECTING; | |
672 | goto out; | |
673 | } | |
674 | EXPORT_SYMBOL(__inet_stream_connect); | |
675 | ||
676 | int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, | |
677 | int addr_len, int flags) | |
678 | { | |
679 | int err; | |
680 | ||
681 | lock_sock(sock->sk); | |
682 | err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0); | |
683 | release_sock(sock->sk); | |
684 | return err; | |
685 | } | |
686 | EXPORT_SYMBOL(inet_stream_connect); | |
687 | ||
688 | /* | |
689 | * Accept a pending connection. The TCP layer now gives BSD semantics. | |
690 | */ | |
691 | ||
692 | int inet_accept(struct socket *sock, struct socket *newsock, int flags, | |
693 | bool kern) | |
694 | { | |
695 | struct sock *sk1 = sock->sk; | |
696 | int err = -EINVAL; | |
697 | struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern); | |
698 | ||
699 | if (!sk2) | |
700 | goto do_err; | |
701 | ||
702 | lock_sock(sk2); | |
703 | ||
704 | sock_rps_record_flow(sk2); | |
705 | WARN_ON(!((1 << sk2->sk_state) & | |
706 | (TCPF_ESTABLISHED | TCPF_SYN_RECV | | |
707 | TCPF_CLOSE_WAIT | TCPF_CLOSE))); | |
708 | ||
709 | sock_graft(sk2, newsock); | |
710 | ||
711 | newsock->state = SS_CONNECTED; | |
712 | err = 0; | |
713 | release_sock(sk2); | |
714 | do_err: | |
715 | return err; | |
716 | } | |
717 | EXPORT_SYMBOL(inet_accept); | |
718 | ||
719 | ||
720 | /* | |
721 | * This does both peername and sockname. | |
722 | */ | |
723 | int inet_getname(struct socket *sock, struct sockaddr *uaddr, | |
724 | int *uaddr_len, int peer) | |
725 | { | |
726 | struct sock *sk = sock->sk; | |
727 | struct inet_sock *inet = inet_sk(sk); | |
728 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); | |
729 | ||
730 | sin->sin_family = AF_INET; | |
731 | if (peer) { | |
732 | if (!inet->inet_dport || | |
733 | (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && | |
734 | peer == 1)) | |
735 | return -ENOTCONN; | |
736 | sin->sin_port = inet->inet_dport; | |
737 | sin->sin_addr.s_addr = inet->inet_daddr; | |
738 | } else { | |
739 | __be32 addr = inet->inet_rcv_saddr; | |
740 | if (!addr) | |
741 | addr = inet->inet_saddr; | |
742 | sin->sin_port = inet->inet_sport; | |
743 | sin->sin_addr.s_addr = addr; | |
744 | } | |
745 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
746 | *uaddr_len = sizeof(*sin); | |
747 | return 0; | |
748 | } | |
749 | EXPORT_SYMBOL(inet_getname); | |
750 | ||
751 | int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) | |
752 | { | |
753 | struct sock *sk = sock->sk; | |
754 | ||
755 | sock_rps_record_flow(sk); | |
756 | ||
757 | /* We may need to bind the socket. */ | |
758 | if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && | |
759 | inet_autobind(sk)) | |
760 | return -EAGAIN; | |
761 | ||
762 | return sk->sk_prot->sendmsg(sk, msg, size); | |
763 | } | |
764 | EXPORT_SYMBOL(inet_sendmsg); | |
765 | ||
766 | ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, | |
767 | size_t size, int flags) | |
768 | { | |
769 | struct sock *sk = sock->sk; | |
770 | ||
771 | sock_rps_record_flow(sk); | |
772 | ||
773 | /* We may need to bind the socket. */ | |
774 | if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && | |
775 | inet_autobind(sk)) | |
776 | return -EAGAIN; | |
777 | ||
778 | if (sk->sk_prot->sendpage) | |
779 | return sk->sk_prot->sendpage(sk, page, offset, size, flags); | |
780 | return sock_no_sendpage(sock, page, offset, size, flags); | |
781 | } | |
782 | EXPORT_SYMBOL(inet_sendpage); | |
783 | ||
784 | int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, | |
785 | int flags) | |
786 | { | |
787 | struct sock *sk = sock->sk; | |
788 | int addr_len = 0; | |
789 | int err; | |
790 | ||
791 | sock_rps_record_flow(sk); | |
792 | ||
793 | err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, | |
794 | flags & ~MSG_DONTWAIT, &addr_len); | |
795 | if (err >= 0) | |
796 | msg->msg_namelen = addr_len; | |
797 | return err; | |
798 | } | |
799 | EXPORT_SYMBOL(inet_recvmsg); | |
800 | ||
801 | int inet_shutdown(struct socket *sock, int how) | |
802 | { | |
803 | struct sock *sk = sock->sk; | |
804 | int err = 0; | |
805 | ||
806 | /* This should really check to make sure | |
807 | * the socket is a TCP socket. (WHY AC...) | |
808 | */ | |
809 | how++; /* maps 0->1 has the advantage of making bit 1 rcvs and | |
810 | 1->2 bit 2 snds. | |
811 | 2->3 */ | |
812 | if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ | |
813 | return -EINVAL; | |
814 | ||
815 | lock_sock(sk); | |
816 | if (sock->state == SS_CONNECTING) { | |
817 | if ((1 << sk->sk_state) & | |
818 | (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) | |
819 | sock->state = SS_DISCONNECTING; | |
820 | else | |
821 | sock->state = SS_CONNECTED; | |
822 | } | |
823 | ||
824 | switch (sk->sk_state) { | |
825 | case TCP_CLOSE: | |
826 | err = -ENOTCONN; | |
827 | /* Hack to wake up other listeners, who can poll for | |
828 | POLLHUP, even on eg. unconnected UDP sockets -- RR */ | |
829 | default: | |
830 | sk->sk_shutdown |= how; | |
831 | if (sk->sk_prot->shutdown) | |
832 | sk->sk_prot->shutdown(sk, how); | |
833 | break; | |
834 | ||
835 | /* Remaining two branches are temporary solution for missing | |
836 | * close() in multithreaded environment. It is _not_ a good idea, | |
837 | * but we have no choice until close() is repaired at VFS level. | |
838 | */ | |
839 | case TCP_LISTEN: | |
840 | if (!(how & RCV_SHUTDOWN)) | |
841 | break; | |
842 | /* Fall through */ | |
843 | case TCP_SYN_SENT: | |
844 | err = sk->sk_prot->disconnect(sk, O_NONBLOCK); | |
845 | sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; | |
846 | break; | |
847 | } | |
848 | ||
849 | /* Wake up anyone sleeping in poll. */ | |
850 | sk->sk_state_change(sk); | |
851 | release_sock(sk); | |
852 | return err; | |
853 | } | |
854 | EXPORT_SYMBOL(inet_shutdown); | |
855 | ||
856 | /* | |
857 | * ioctl() calls you can issue on an INET socket. Most of these are | |
858 | * device configuration and stuff and very rarely used. Some ioctls | |
859 | * pass on to the socket itself. | |
860 | * | |
861 | * NOTE: I like the idea of a module for the config stuff. ie ifconfig | |
862 | * loads the devconfigure module does its configuring and unloads it. | |
863 | * There's a good 20K of config code hanging around the kernel. | |
864 | */ | |
865 | ||
866 | int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
867 | { | |
868 | struct sock *sk = sock->sk; | |
869 | int err = 0; | |
870 | struct net *net = sock_net(sk); | |
871 | ||
872 | switch (cmd) { | |
873 | case SIOCGSTAMP: | |
874 | err = sock_get_timestamp(sk, (struct timeval __user *)arg); | |
875 | break; | |
876 | case SIOCGSTAMPNS: | |
877 | err = sock_get_timestampns(sk, (struct timespec __user *)arg); | |
878 | break; | |
879 | case SIOCADDRT: | |
880 | case SIOCDELRT: | |
881 | case SIOCRTMSG: | |
882 | err = ip_rt_ioctl(net, cmd, (void __user *)arg); | |
883 | break; | |
884 | case SIOCDARP: | |
885 | case SIOCGARP: | |
886 | case SIOCSARP: | |
887 | err = arp_ioctl(net, cmd, (void __user *)arg); | |
888 | break; | |
889 | case SIOCGIFADDR: | |
890 | case SIOCSIFADDR: | |
891 | case SIOCGIFBRDADDR: | |
892 | case SIOCSIFBRDADDR: | |
893 | case SIOCGIFNETMASK: | |
894 | case SIOCSIFNETMASK: | |
895 | case SIOCGIFDSTADDR: | |
896 | case SIOCSIFDSTADDR: | |
897 | case SIOCSIFPFLAGS: | |
898 | case SIOCGIFPFLAGS: | |
899 | case SIOCSIFFLAGS: | |
900 | err = devinet_ioctl(net, cmd, (void __user *)arg); | |
901 | break; | |
902 | default: | |
903 | if (sk->sk_prot->ioctl) | |
904 | err = sk->sk_prot->ioctl(sk, cmd, arg); | |
905 | else | |
906 | err = -ENOIOCTLCMD; | |
907 | break; | |
908 | } | |
909 | return err; | |
910 | } | |
911 | EXPORT_SYMBOL(inet_ioctl); | |
912 | ||
913 | #ifdef CONFIG_COMPAT | |
914 | static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
915 | { | |
916 | struct sock *sk = sock->sk; | |
917 | int err = -ENOIOCTLCMD; | |
918 | ||
919 | if (sk->sk_prot->compat_ioctl) | |
920 | err = sk->sk_prot->compat_ioctl(sk, cmd, arg); | |
921 | ||
922 | return err; | |
923 | } | |
924 | #endif | |
925 | ||
926 | const struct proto_ops inet_stream_ops = { | |
927 | .family = PF_INET, | |
928 | .owner = THIS_MODULE, | |
929 | .release = inet_release, | |
930 | .bind = inet_bind, | |
931 | .connect = inet_stream_connect, | |
932 | .socketpair = sock_no_socketpair, | |
933 | .accept = inet_accept, | |
934 | .getname = inet_getname, | |
935 | .poll = tcp_poll, | |
936 | .ioctl = inet_ioctl, | |
937 | .listen = inet_listen, | |
938 | .shutdown = inet_shutdown, | |
939 | .setsockopt = sock_common_setsockopt, | |
940 | .getsockopt = sock_common_getsockopt, | |
941 | .sendmsg = inet_sendmsg, | |
942 | .recvmsg = inet_recvmsg, | |
943 | .mmap = sock_no_mmap, | |
944 | .sendpage = inet_sendpage, | |
945 | .splice_read = tcp_splice_read, | |
946 | .read_sock = tcp_read_sock, | |
947 | .peek_len = tcp_peek_len, | |
948 | #ifdef CONFIG_COMPAT | |
949 | .compat_setsockopt = compat_sock_common_setsockopt, | |
950 | .compat_getsockopt = compat_sock_common_getsockopt, | |
951 | .compat_ioctl = inet_compat_ioctl, | |
952 | #endif | |
953 | }; | |
954 | EXPORT_SYMBOL(inet_stream_ops); | |
955 | ||
956 | const struct proto_ops inet_dgram_ops = { | |
957 | .family = PF_INET, | |
958 | .owner = THIS_MODULE, | |
959 | .release = inet_release, | |
960 | .bind = inet_bind, | |
961 | .connect = inet_dgram_connect, | |
962 | .socketpair = sock_no_socketpair, | |
963 | .accept = sock_no_accept, | |
964 | .getname = inet_getname, | |
965 | .poll = udp_poll, | |
966 | .ioctl = inet_ioctl, | |
967 | .listen = sock_no_listen, | |
968 | .shutdown = inet_shutdown, | |
969 | .setsockopt = sock_common_setsockopt, | |
970 | .getsockopt = sock_common_getsockopt, | |
971 | .sendmsg = inet_sendmsg, | |
972 | .recvmsg = inet_recvmsg, | |
973 | .mmap = sock_no_mmap, | |
974 | .sendpage = inet_sendpage, | |
975 | .set_peek_off = sk_set_peek_off, | |
976 | #ifdef CONFIG_COMPAT | |
977 | .compat_setsockopt = compat_sock_common_setsockopt, | |
978 | .compat_getsockopt = compat_sock_common_getsockopt, | |
979 | .compat_ioctl = inet_compat_ioctl, | |
980 | #endif | |
981 | }; | |
982 | EXPORT_SYMBOL(inet_dgram_ops); | |
983 | ||
984 | /* | |
985 | * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without | |
986 | * udp_poll | |
987 | */ | |
988 | static const struct proto_ops inet_sockraw_ops = { | |
989 | .family = PF_INET, | |
990 | .owner = THIS_MODULE, | |
991 | .release = inet_release, | |
992 | .bind = inet_bind, | |
993 | .connect = inet_dgram_connect, | |
994 | .socketpair = sock_no_socketpair, | |
995 | .accept = sock_no_accept, | |
996 | .getname = inet_getname, | |
997 | .poll = datagram_poll, | |
998 | .ioctl = inet_ioctl, | |
999 | .listen = sock_no_listen, | |
1000 | .shutdown = inet_shutdown, | |
1001 | .setsockopt = sock_common_setsockopt, | |
1002 | .getsockopt = sock_common_getsockopt, | |
1003 | .sendmsg = inet_sendmsg, | |
1004 | .recvmsg = inet_recvmsg, | |
1005 | .mmap = sock_no_mmap, | |
1006 | .sendpage = inet_sendpage, | |
1007 | #ifdef CONFIG_COMPAT | |
1008 | .compat_setsockopt = compat_sock_common_setsockopt, | |
1009 | .compat_getsockopt = compat_sock_common_getsockopt, | |
1010 | .compat_ioctl = inet_compat_ioctl, | |
1011 | #endif | |
1012 | }; | |
1013 | ||
1014 | static const struct net_proto_family inet_family_ops = { | |
1015 | .family = PF_INET, | |
1016 | .create = inet_create, | |
1017 | .owner = THIS_MODULE, | |
1018 | }; | |
1019 | ||
1020 | /* Upon startup we insert all the elements in inetsw_array[] into | |
1021 | * the linked list inetsw. | |
1022 | */ | |
1023 | static struct inet_protosw inetsw_array[] = | |
1024 | { | |
1025 | { | |
1026 | .type = SOCK_STREAM, | |
1027 | .protocol = IPPROTO_TCP, | |
1028 | .prot = &tcp_prot, | |
1029 | .ops = &inet_stream_ops, | |
1030 | .flags = INET_PROTOSW_PERMANENT | | |
1031 | INET_PROTOSW_ICSK, | |
1032 | }, | |
1033 | ||
1034 | { | |
1035 | .type = SOCK_DGRAM, | |
1036 | .protocol = IPPROTO_UDP, | |
1037 | .prot = &udp_prot, | |
1038 | .ops = &inet_dgram_ops, | |
1039 | .flags = INET_PROTOSW_PERMANENT, | |
1040 | }, | |
1041 | ||
1042 | { | |
1043 | .type = SOCK_DGRAM, | |
1044 | .protocol = IPPROTO_ICMP, | |
1045 | .prot = &ping_prot, | |
1046 | .ops = &inet_sockraw_ops, | |
1047 | .flags = INET_PROTOSW_REUSE, | |
1048 | }, | |
1049 | ||
1050 | { | |
1051 | .type = SOCK_RAW, | |
1052 | .protocol = IPPROTO_IP, /* wild card */ | |
1053 | .prot = &raw_prot, | |
1054 | .ops = &inet_sockraw_ops, | |
1055 | .flags = INET_PROTOSW_REUSE, | |
1056 | } | |
1057 | }; | |
1058 | ||
1059 | #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) | |
1060 | ||
1061 | void inet_register_protosw(struct inet_protosw *p) | |
1062 | { | |
1063 | struct list_head *lh; | |
1064 | struct inet_protosw *answer; | |
1065 | int protocol = p->protocol; | |
1066 | struct list_head *last_perm; | |
1067 | ||
1068 | spin_lock_bh(&inetsw_lock); | |
1069 | ||
1070 | if (p->type >= SOCK_MAX) | |
1071 | goto out_illegal; | |
1072 | ||
1073 | /* If we are trying to override a permanent protocol, bail. */ | |
1074 | last_perm = &inetsw[p->type]; | |
1075 | list_for_each(lh, &inetsw[p->type]) { | |
1076 | answer = list_entry(lh, struct inet_protosw, list); | |
1077 | /* Check only the non-wild match. */ | |
1078 | if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) | |
1079 | break; | |
1080 | if (protocol == answer->protocol) | |
1081 | goto out_permanent; | |
1082 | last_perm = lh; | |
1083 | } | |
1084 | ||
1085 | /* Add the new entry after the last permanent entry if any, so that | |
1086 | * the new entry does not override a permanent entry when matched with | |
1087 | * a wild-card protocol. But it is allowed to override any existing | |
1088 | * non-permanent entry. This means that when we remove this entry, the | |
1089 | * system automatically returns to the old behavior. | |
1090 | */ | |
1091 | list_add_rcu(&p->list, last_perm); | |
1092 | out: | |
1093 | spin_unlock_bh(&inetsw_lock); | |
1094 | ||
1095 | return; | |
1096 | ||
1097 | out_permanent: | |
1098 | pr_err("Attempt to override permanent protocol %d\n", protocol); | |
1099 | goto out; | |
1100 | ||
1101 | out_illegal: | |
1102 | pr_err("Ignoring attempt to register invalid socket type %d\n", | |
1103 | p->type); | |
1104 | goto out; | |
1105 | } | |
1106 | EXPORT_SYMBOL(inet_register_protosw); | |
1107 | ||
1108 | void inet_unregister_protosw(struct inet_protosw *p) | |
1109 | { | |
1110 | if (INET_PROTOSW_PERMANENT & p->flags) { | |
1111 | pr_err("Attempt to unregister permanent protocol %d\n", | |
1112 | p->protocol); | |
1113 | } else { | |
1114 | spin_lock_bh(&inetsw_lock); | |
1115 | list_del_rcu(&p->list); | |
1116 | spin_unlock_bh(&inetsw_lock); | |
1117 | ||
1118 | synchronize_net(); | |
1119 | } | |
1120 | } | |
1121 | EXPORT_SYMBOL(inet_unregister_protosw); | |
1122 | ||
1123 | static int inet_sk_reselect_saddr(struct sock *sk) | |
1124 | { | |
1125 | struct inet_sock *inet = inet_sk(sk); | |
1126 | __be32 old_saddr = inet->inet_saddr; | |
1127 | __be32 daddr = inet->inet_daddr; | |
1128 | struct flowi4 *fl4; | |
1129 | struct rtable *rt; | |
1130 | __be32 new_saddr; | |
1131 | struct ip_options_rcu *inet_opt; | |
1132 | ||
1133 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
1134 | lockdep_sock_is_held(sk)); | |
1135 | if (inet_opt && inet_opt->opt.srr) | |
1136 | daddr = inet_opt->opt.faddr; | |
1137 | ||
1138 | /* Query new route. */ | |
1139 | fl4 = &inet->cork.fl.u.ip4; | |
1140 | rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), | |
1141 | sk->sk_bound_dev_if, sk->sk_protocol, | |
1142 | inet->inet_sport, inet->inet_dport, sk); | |
1143 | if (IS_ERR(rt)) | |
1144 | return PTR_ERR(rt); | |
1145 | ||
1146 | sk_setup_caps(sk, &rt->dst); | |
1147 | ||
1148 | new_saddr = fl4->saddr; | |
1149 | ||
1150 | if (new_saddr == old_saddr) | |
1151 | return 0; | |
1152 | ||
1153 | if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) { | |
1154 | pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", | |
1155 | __func__, &old_saddr, &new_saddr); | |
1156 | } | |
1157 | ||
1158 | inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; | |
1159 | ||
1160 | /* | |
1161 | * XXX The only one ugly spot where we need to | |
1162 | * XXX really change the sockets identity after | |
1163 | * XXX it has entered the hashes. -DaveM | |
1164 | * | |
1165 | * Besides that, it does not check for connection | |
1166 | * uniqueness. Wait for troubles. | |
1167 | */ | |
1168 | return __sk_prot_rehash(sk); | |
1169 | } | |
1170 | ||
1171 | int inet_sk_rebuild_header(struct sock *sk) | |
1172 | { | |
1173 | struct inet_sock *inet = inet_sk(sk); | |
1174 | struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); | |
1175 | __be32 daddr; | |
1176 | struct ip_options_rcu *inet_opt; | |
1177 | struct flowi4 *fl4; | |
1178 | int err; | |
1179 | ||
1180 | /* Route is OK, nothing to do. */ | |
1181 | if (rt) | |
1182 | return 0; | |
1183 | ||
1184 | /* Reroute. */ | |
1185 | rcu_read_lock(); | |
1186 | inet_opt = rcu_dereference(inet->inet_opt); | |
1187 | daddr = inet->inet_daddr; | |
1188 | if (inet_opt && inet_opt->opt.srr) | |
1189 | daddr = inet_opt->opt.faddr; | |
1190 | rcu_read_unlock(); | |
1191 | fl4 = &inet->cork.fl.u.ip4; | |
1192 | rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, | |
1193 | inet->inet_dport, inet->inet_sport, | |
1194 | sk->sk_protocol, RT_CONN_FLAGS(sk), | |
1195 | sk->sk_bound_dev_if); | |
1196 | if (!IS_ERR(rt)) { | |
1197 | err = 0; | |
1198 | sk_setup_caps(sk, &rt->dst); | |
1199 | } else { | |
1200 | err = PTR_ERR(rt); | |
1201 | ||
1202 | /* Routing failed... */ | |
1203 | sk->sk_route_caps = 0; | |
1204 | /* | |
1205 | * Other protocols have to map its equivalent state to TCP_SYN_SENT. | |
1206 | * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme | |
1207 | */ | |
1208 | if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr || | |
1209 | sk->sk_state != TCP_SYN_SENT || | |
1210 | (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || | |
1211 | (err = inet_sk_reselect_saddr(sk)) != 0) | |
1212 | sk->sk_err_soft = -err; | |
1213 | } | |
1214 | ||
1215 | return err; | |
1216 | } | |
1217 | EXPORT_SYMBOL(inet_sk_rebuild_header); | |
1218 | ||
1219 | struct sk_buff *inet_gso_segment(struct sk_buff *skb, | |
1220 | netdev_features_t features) | |
1221 | { | |
1222 | bool udpfrag = false, fixedid = false, gso_partial, encap; | |
1223 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
1224 | const struct net_offload *ops; | |
1225 | unsigned int offset = 0; | |
1226 | struct iphdr *iph; | |
1227 | int proto, tot_len; | |
1228 | int nhoff; | |
1229 | int ihl; | |
1230 | int id; | |
1231 | ||
1232 | skb_reset_network_header(skb); | |
1233 | nhoff = skb_network_header(skb) - skb_mac_header(skb); | |
1234 | if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) | |
1235 | goto out; | |
1236 | ||
1237 | iph = ip_hdr(skb); | |
1238 | ihl = iph->ihl * 4; | |
1239 | if (ihl < sizeof(*iph)) | |
1240 | goto out; | |
1241 | ||
1242 | id = ntohs(iph->id); | |
1243 | proto = iph->protocol; | |
1244 | ||
1245 | /* Warning: after this point, iph might be no longer valid */ | |
1246 | if (unlikely(!pskb_may_pull(skb, ihl))) | |
1247 | goto out; | |
1248 | __skb_pull(skb, ihl); | |
1249 | ||
1250 | encap = SKB_GSO_CB(skb)->encap_level > 0; | |
1251 | if (encap) | |
1252 | features &= skb->dev->hw_enc_features; | |
1253 | SKB_GSO_CB(skb)->encap_level += ihl; | |
1254 | ||
1255 | skb_reset_transport_header(skb); | |
1256 | ||
1257 | segs = ERR_PTR(-EPROTONOSUPPORT); | |
1258 | ||
1259 | if (!skb->encapsulation || encap) { | |
1260 | udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); | |
1261 | fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID); | |
1262 | ||
1263 | /* fixed ID is invalid if DF bit is not set */ | |
1264 | if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF))) | |
1265 | goto out; | |
1266 | } | |
1267 | ||
1268 | ops = rcu_dereference(inet_offloads[proto]); | |
1269 | if (likely(ops && ops->callbacks.gso_segment)) | |
1270 | segs = ops->callbacks.gso_segment(skb, features); | |
1271 | ||
1272 | if (IS_ERR_OR_NULL(segs)) | |
1273 | goto out; | |
1274 | ||
1275 | gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); | |
1276 | ||
1277 | skb = segs; | |
1278 | do { | |
1279 | iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); | |
1280 | if (udpfrag) { | |
1281 | iph->frag_off = htons(offset >> 3); | |
1282 | if (skb->next) | |
1283 | iph->frag_off |= htons(IP_MF); | |
1284 | offset += skb->len - nhoff - ihl; | |
1285 | tot_len = skb->len - nhoff; | |
1286 | } else if (skb_is_gso(skb)) { | |
1287 | if (!fixedid) { | |
1288 | iph->id = htons(id); | |
1289 | id += skb_shinfo(skb)->gso_segs; | |
1290 | } | |
1291 | ||
1292 | if (gso_partial) | |
1293 | tot_len = skb_shinfo(skb)->gso_size + | |
1294 | SKB_GSO_CB(skb)->data_offset + | |
1295 | skb->head - (unsigned char *)iph; | |
1296 | else | |
1297 | tot_len = skb->len - nhoff; | |
1298 | } else { | |
1299 | if (!fixedid) | |
1300 | iph->id = htons(id++); | |
1301 | tot_len = skb->len - nhoff; | |
1302 | } | |
1303 | iph->tot_len = htons(tot_len); | |
1304 | ip_send_check(iph); | |
1305 | if (encap) | |
1306 | skb_reset_inner_headers(skb); | |
1307 | skb->network_header = (u8 *)iph - skb->head; | |
1308 | } while ((skb = skb->next)); | |
1309 | ||
1310 | out: | |
1311 | return segs; | |
1312 | } | |
1313 | EXPORT_SYMBOL(inet_gso_segment); | |
1314 | ||
1315 | struct sk_buff **inet_gro_receive(struct sk_buff **head, struct sk_buff *skb) | |
1316 | { | |
1317 | const struct net_offload *ops; | |
1318 | struct sk_buff **pp = NULL; | |
1319 | struct sk_buff *p; | |
1320 | const struct iphdr *iph; | |
1321 | unsigned int hlen; | |
1322 | unsigned int off; | |
1323 | unsigned int id; | |
1324 | int flush = 1; | |
1325 | int proto; | |
1326 | ||
1327 | off = skb_gro_offset(skb); | |
1328 | hlen = off + sizeof(*iph); | |
1329 | iph = skb_gro_header_fast(skb, off); | |
1330 | if (skb_gro_header_hard(skb, hlen)) { | |
1331 | iph = skb_gro_header_slow(skb, hlen, off); | |
1332 | if (unlikely(!iph)) | |
1333 | goto out; | |
1334 | } | |
1335 | ||
1336 | proto = iph->protocol; | |
1337 | ||
1338 | rcu_read_lock(); | |
1339 | ops = rcu_dereference(inet_offloads[proto]); | |
1340 | if (!ops || !ops->callbacks.gro_receive) | |
1341 | goto out_unlock; | |
1342 | ||
1343 | if (*(u8 *)iph != 0x45) | |
1344 | goto out_unlock; | |
1345 | ||
1346 | if (ip_is_fragment(iph)) | |
1347 | goto out_unlock; | |
1348 | ||
1349 | if (unlikely(ip_fast_csum((u8 *)iph, 5))) | |
1350 | goto out_unlock; | |
1351 | ||
1352 | id = ntohl(*(__be32 *)&iph->id); | |
1353 | flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); | |
1354 | id >>= 16; | |
1355 | ||
1356 | for (p = *head; p; p = p->next) { | |
1357 | struct iphdr *iph2; | |
1358 | u16 flush_id; | |
1359 | ||
1360 | if (!NAPI_GRO_CB(p)->same_flow) | |
1361 | continue; | |
1362 | ||
1363 | iph2 = (struct iphdr *)(p->data + off); | |
1364 | /* The above works because, with the exception of the top | |
1365 | * (inner most) layer, we only aggregate pkts with the same | |
1366 | * hdr length so all the hdrs we'll need to verify will start | |
1367 | * at the same offset. | |
1368 | */ | |
1369 | if ((iph->protocol ^ iph2->protocol) | | |
1370 | ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | | |
1371 | ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { | |
1372 | NAPI_GRO_CB(p)->same_flow = 0; | |
1373 | continue; | |
1374 | } | |
1375 | ||
1376 | /* All fields must match except length and checksum. */ | |
1377 | NAPI_GRO_CB(p)->flush |= | |
1378 | (iph->ttl ^ iph2->ttl) | | |
1379 | (iph->tos ^ iph2->tos) | | |
1380 | ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); | |
1381 | ||
1382 | NAPI_GRO_CB(p)->flush |= flush; | |
1383 | ||
1384 | /* We need to store of the IP ID check to be included later | |
1385 | * when we can verify that this packet does in fact belong | |
1386 | * to a given flow. | |
1387 | */ | |
1388 | flush_id = (u16)(id - ntohs(iph2->id)); | |
1389 | ||
1390 | /* This bit of code makes it much easier for us to identify | |
1391 | * the cases where we are doing atomic vs non-atomic IP ID | |
1392 | * checks. Specifically an atomic check can return IP ID | |
1393 | * values 0 - 0xFFFF, while a non-atomic check can only | |
1394 | * return 0 or 0xFFFF. | |
1395 | */ | |
1396 | if (!NAPI_GRO_CB(p)->is_atomic || | |
1397 | !(iph->frag_off & htons(IP_DF))) { | |
1398 | flush_id ^= NAPI_GRO_CB(p)->count; | |
1399 | flush_id = flush_id ? 0xFFFF : 0; | |
1400 | } | |
1401 | ||
1402 | /* If the previous IP ID value was based on an atomic | |
1403 | * datagram we can overwrite the value and ignore it. | |
1404 | */ | |
1405 | if (NAPI_GRO_CB(skb)->is_atomic) | |
1406 | NAPI_GRO_CB(p)->flush_id = flush_id; | |
1407 | else | |
1408 | NAPI_GRO_CB(p)->flush_id |= flush_id; | |
1409 | } | |
1410 | ||
1411 | NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF)); | |
1412 | NAPI_GRO_CB(skb)->flush |= flush; | |
1413 | skb_set_network_header(skb, off); | |
1414 | /* The above will be needed by the transport layer if there is one | |
1415 | * immediately following this IP hdr. | |
1416 | */ | |
1417 | ||
1418 | /* Note : No need to call skb_gro_postpull_rcsum() here, | |
1419 | * as we already checked checksum over ipv4 header was 0 | |
1420 | */ | |
1421 | skb_gro_pull(skb, sizeof(*iph)); | |
1422 | skb_set_transport_header(skb, skb_gro_offset(skb)); | |
1423 | ||
1424 | pp = call_gro_receive(ops->callbacks.gro_receive, head, skb); | |
1425 | ||
1426 | out_unlock: | |
1427 | rcu_read_unlock(); | |
1428 | ||
1429 | out: | |
1430 | skb_gro_flush_final(skb, pp, flush); | |
1431 | ||
1432 | return pp; | |
1433 | } | |
1434 | EXPORT_SYMBOL(inet_gro_receive); | |
1435 | ||
1436 | static struct sk_buff **ipip_gro_receive(struct sk_buff **head, | |
1437 | struct sk_buff *skb) | |
1438 | { | |
1439 | if (NAPI_GRO_CB(skb)->encap_mark) { | |
1440 | NAPI_GRO_CB(skb)->flush = 1; | |
1441 | return NULL; | |
1442 | } | |
1443 | ||
1444 | NAPI_GRO_CB(skb)->encap_mark = 1; | |
1445 | ||
1446 | return inet_gro_receive(head, skb); | |
1447 | } | |
1448 | ||
1449 | #define SECONDS_PER_DAY 86400 | |
1450 | ||
1451 | /* inet_current_timestamp - Return IP network timestamp | |
1452 | * | |
1453 | * Return milliseconds since midnight in network byte order. | |
1454 | */ | |
1455 | __be32 inet_current_timestamp(void) | |
1456 | { | |
1457 | u32 secs; | |
1458 | u32 msecs; | |
1459 | struct timespec64 ts; | |
1460 | ||
1461 | ktime_get_real_ts64(&ts); | |
1462 | ||
1463 | /* Get secs since midnight. */ | |
1464 | (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs); | |
1465 | /* Convert to msecs. */ | |
1466 | msecs = secs * MSEC_PER_SEC; | |
1467 | /* Convert nsec to msec. */ | |
1468 | msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC; | |
1469 | ||
1470 | /* Convert to network byte order. */ | |
1471 | return htonl(msecs); | |
1472 | } | |
1473 | EXPORT_SYMBOL(inet_current_timestamp); | |
1474 | ||
1475 | int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) | |
1476 | { | |
1477 | if (sk->sk_family == AF_INET) | |
1478 | return ip_recv_error(sk, msg, len, addr_len); | |
1479 | #if IS_ENABLED(CONFIG_IPV6) | |
1480 | if (sk->sk_family == AF_INET6) | |
1481 | return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); | |
1482 | #endif | |
1483 | return -EINVAL; | |
1484 | } | |
1485 | ||
1486 | int inet_gro_complete(struct sk_buff *skb, int nhoff) | |
1487 | { | |
1488 | __be16 newlen = htons(skb->len - nhoff); | |
1489 | struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); | |
1490 | const struct net_offload *ops; | |
1491 | int proto = iph->protocol; | |
1492 | int err = -ENOSYS; | |
1493 | ||
1494 | if (skb->encapsulation) { | |
1495 | skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP)); | |
1496 | skb_set_inner_network_header(skb, nhoff); | |
1497 | } | |
1498 | ||
1499 | csum_replace2(&iph->check, iph->tot_len, newlen); | |
1500 | iph->tot_len = newlen; | |
1501 | ||
1502 | rcu_read_lock(); | |
1503 | ops = rcu_dereference(inet_offloads[proto]); | |
1504 | if (WARN_ON(!ops || !ops->callbacks.gro_complete)) | |
1505 | goto out_unlock; | |
1506 | ||
1507 | /* Only need to add sizeof(*iph) to get to the next hdr below | |
1508 | * because any hdr with option will have been flushed in | |
1509 | * inet_gro_receive(). | |
1510 | */ | |
1511 | err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph)); | |
1512 | ||
1513 | out_unlock: | |
1514 | rcu_read_unlock(); | |
1515 | ||
1516 | return err; | |
1517 | } | |
1518 | EXPORT_SYMBOL(inet_gro_complete); | |
1519 | ||
1520 | static int ipip_gro_complete(struct sk_buff *skb, int nhoff) | |
1521 | { | |
1522 | skb->encapsulation = 1; | |
1523 | skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4; | |
1524 | return inet_gro_complete(skb, nhoff); | |
1525 | } | |
1526 | ||
1527 | int inet_ctl_sock_create(struct sock **sk, unsigned short family, | |
1528 | unsigned short type, unsigned char protocol, | |
1529 | struct net *net) | |
1530 | { | |
1531 | struct socket *sock; | |
1532 | int rc = sock_create_kern(net, family, type, protocol, &sock); | |
1533 | ||
1534 | if (rc == 0) { | |
1535 | *sk = sock->sk; | |
1536 | (*sk)->sk_allocation = GFP_ATOMIC; | |
1537 | /* | |
1538 | * Unhash it so that IP input processing does not even see it, | |
1539 | * we do not wish this socket to see incoming packets. | |
1540 | */ | |
1541 | (*sk)->sk_prot->unhash(*sk); | |
1542 | } | |
1543 | return rc; | |
1544 | } | |
1545 | EXPORT_SYMBOL_GPL(inet_ctl_sock_create); | |
1546 | ||
1547 | u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt) | |
1548 | { | |
1549 | return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt); | |
1550 | } | |
1551 | EXPORT_SYMBOL_GPL(snmp_get_cpu_field); | |
1552 | ||
1553 | unsigned long snmp_fold_field(void __percpu *mib, int offt) | |
1554 | { | |
1555 | unsigned long res = 0; | |
1556 | int i; | |
1557 | ||
1558 | for_each_possible_cpu(i) | |
1559 | res += snmp_get_cpu_field(mib, i, offt); | |
1560 | return res; | |
1561 | } | |
1562 | EXPORT_SYMBOL_GPL(snmp_fold_field); | |
1563 | ||
1564 | #if BITS_PER_LONG==32 | |
1565 | ||
1566 | u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, | |
1567 | size_t syncp_offset) | |
1568 | { | |
1569 | void *bhptr; | |
1570 | struct u64_stats_sync *syncp; | |
1571 | u64 v; | |
1572 | unsigned int start; | |
1573 | ||
1574 | bhptr = per_cpu_ptr(mib, cpu); | |
1575 | syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); | |
1576 | do { | |
1577 | start = u64_stats_fetch_begin_irq(syncp); | |
1578 | v = *(((u64 *)bhptr) + offt); | |
1579 | } while (u64_stats_fetch_retry_irq(syncp, start)); | |
1580 | ||
1581 | return v; | |
1582 | } | |
1583 | EXPORT_SYMBOL_GPL(snmp_get_cpu_field64); | |
1584 | ||
1585 | u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) | |
1586 | { | |
1587 | u64 res = 0; | |
1588 | int cpu; | |
1589 | ||
1590 | for_each_possible_cpu(cpu) { | |
1591 | res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); | |
1592 | } | |
1593 | return res; | |
1594 | } | |
1595 | EXPORT_SYMBOL_GPL(snmp_fold_field64); | |
1596 | #endif | |
1597 | ||
1598 | #ifdef CONFIG_IP_MULTICAST | |
1599 | static const struct net_protocol igmp_protocol = { | |
1600 | .handler = igmp_rcv, | |
1601 | .netns_ok = 1, | |
1602 | }; | |
1603 | #endif | |
1604 | ||
1605 | static struct net_protocol tcp_protocol = { | |
1606 | .early_demux = tcp_v4_early_demux, | |
1607 | .early_demux_handler = tcp_v4_early_demux, | |
1608 | .handler = tcp_v4_rcv, | |
1609 | .err_handler = tcp_v4_err, | |
1610 | .no_policy = 1, | |
1611 | .netns_ok = 1, | |
1612 | .icmp_strict_tag_validation = 1, | |
1613 | }; | |
1614 | ||
1615 | static struct net_protocol udp_protocol = { | |
1616 | .early_demux = udp_v4_early_demux, | |
1617 | .early_demux_handler = udp_v4_early_demux, | |
1618 | .handler = udp_rcv, | |
1619 | .err_handler = udp_err, | |
1620 | .no_policy = 1, | |
1621 | .netns_ok = 1, | |
1622 | }; | |
1623 | ||
1624 | static const struct net_protocol icmp_protocol = { | |
1625 | .handler = icmp_rcv, | |
1626 | .err_handler = icmp_err, | |
1627 | .no_policy = 1, | |
1628 | .netns_ok = 1, | |
1629 | }; | |
1630 | ||
1631 | static __net_init int ipv4_mib_init_net(struct net *net) | |
1632 | { | |
1633 | int i; | |
1634 | ||
1635 | net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); | |
1636 | if (!net->mib.tcp_statistics) | |
1637 | goto err_tcp_mib; | |
1638 | net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); | |
1639 | if (!net->mib.ip_statistics) | |
1640 | goto err_ip_mib; | |
1641 | ||
1642 | for_each_possible_cpu(i) { | |
1643 | struct ipstats_mib *af_inet_stats; | |
1644 | af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); | |
1645 | u64_stats_init(&af_inet_stats->syncp); | |
1646 | } | |
1647 | ||
1648 | net->mib.net_statistics = alloc_percpu(struct linux_mib); | |
1649 | if (!net->mib.net_statistics) | |
1650 | goto err_net_mib; | |
1651 | net->mib.udp_statistics = alloc_percpu(struct udp_mib); | |
1652 | if (!net->mib.udp_statistics) | |
1653 | goto err_udp_mib; | |
1654 | net->mib.udplite_statistics = alloc_percpu(struct udp_mib); | |
1655 | if (!net->mib.udplite_statistics) | |
1656 | goto err_udplite_mib; | |
1657 | net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); | |
1658 | if (!net->mib.icmp_statistics) | |
1659 | goto err_icmp_mib; | |
1660 | net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), | |
1661 | GFP_KERNEL); | |
1662 | if (!net->mib.icmpmsg_statistics) | |
1663 | goto err_icmpmsg_mib; | |
1664 | ||
1665 | tcp_mib_init(net); | |
1666 | return 0; | |
1667 | ||
1668 | err_icmpmsg_mib: | |
1669 | free_percpu(net->mib.icmp_statistics); | |
1670 | err_icmp_mib: | |
1671 | free_percpu(net->mib.udplite_statistics); | |
1672 | err_udplite_mib: | |
1673 | free_percpu(net->mib.udp_statistics); | |
1674 | err_udp_mib: | |
1675 | free_percpu(net->mib.net_statistics); | |
1676 | err_net_mib: | |
1677 | free_percpu(net->mib.ip_statistics); | |
1678 | err_ip_mib: | |
1679 | free_percpu(net->mib.tcp_statistics); | |
1680 | err_tcp_mib: | |
1681 | return -ENOMEM; | |
1682 | } | |
1683 | ||
1684 | static __net_exit void ipv4_mib_exit_net(struct net *net) | |
1685 | { | |
1686 | kfree(net->mib.icmpmsg_statistics); | |
1687 | free_percpu(net->mib.icmp_statistics); | |
1688 | free_percpu(net->mib.udplite_statistics); | |
1689 | free_percpu(net->mib.udp_statistics); | |
1690 | free_percpu(net->mib.net_statistics); | |
1691 | free_percpu(net->mib.ip_statistics); | |
1692 | free_percpu(net->mib.tcp_statistics); | |
1693 | } | |
1694 | ||
1695 | static __net_initdata struct pernet_operations ipv4_mib_ops = { | |
1696 | .init = ipv4_mib_init_net, | |
1697 | .exit = ipv4_mib_exit_net, | |
1698 | }; | |
1699 | ||
1700 | static int __init init_ipv4_mibs(void) | |
1701 | { | |
1702 | return register_pernet_subsys(&ipv4_mib_ops); | |
1703 | } | |
1704 | ||
1705 | static __net_init int inet_init_net(struct net *net) | |
1706 | { | |
1707 | /* | |
1708 | * Set defaults for local port range | |
1709 | */ | |
1710 | seqlock_init(&net->ipv4.ip_local_ports.lock); | |
1711 | net->ipv4.ip_local_ports.range[0] = 32768; | |
1712 | net->ipv4.ip_local_ports.range[1] = 60999; | |
1713 | ||
1714 | seqlock_init(&net->ipv4.ping_group_range.lock); | |
1715 | /* | |
1716 | * Sane defaults - nobody may create ping sockets. | |
1717 | * Boot scripts should set this to distro-specific group. | |
1718 | */ | |
1719 | net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); | |
1720 | net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); | |
1721 | ||
1722 | /* Default values for sysctl-controlled parameters. | |
1723 | * We set them here, in case sysctl is not compiled. | |
1724 | */ | |
1725 | net->ipv4.sysctl_ip_default_ttl = IPDEFTTL; | |
1726 | net->ipv4.sysctl_ip_dynaddr = 0; | |
1727 | net->ipv4.sysctl_ip_early_demux = 1; | |
1728 | net->ipv4.sysctl_udp_early_demux = 1; | |
1729 | net->ipv4.sysctl_tcp_early_demux = 1; | |
1730 | #ifdef CONFIG_SYSCTL | |
1731 | net->ipv4.sysctl_ip_prot_sock = PROT_SOCK; | |
1732 | #endif | |
1733 | ||
1734 | /* Some igmp sysctl, whose values are always used */ | |
1735 | net->ipv4.sysctl_igmp_max_memberships = 20; | |
1736 | net->ipv4.sysctl_igmp_max_msf = 10; | |
1737 | /* IGMP reports for link-local multicast groups are enabled by default */ | |
1738 | net->ipv4.sysctl_igmp_llm_reports = 1; | |
1739 | net->ipv4.sysctl_igmp_qrv = 2; | |
1740 | ||
1741 | return 0; | |
1742 | } | |
1743 | ||
1744 | static __net_exit void inet_exit_net(struct net *net) | |
1745 | { | |
1746 | } | |
1747 | ||
1748 | static __net_initdata struct pernet_operations af_inet_ops = { | |
1749 | .init = inet_init_net, | |
1750 | .exit = inet_exit_net, | |
1751 | }; | |
1752 | ||
1753 | static int __init init_inet_pernet_ops(void) | |
1754 | { | |
1755 | return register_pernet_subsys(&af_inet_ops); | |
1756 | } | |
1757 | ||
1758 | static int ipv4_proc_init(void); | |
1759 | ||
1760 | /* | |
1761 | * IP protocol layer initialiser | |
1762 | */ | |
1763 | ||
1764 | static struct packet_offload ip_packet_offload __read_mostly = { | |
1765 | .type = cpu_to_be16(ETH_P_IP), | |
1766 | .callbacks = { | |
1767 | .gso_segment = inet_gso_segment, | |
1768 | .gro_receive = inet_gro_receive, | |
1769 | .gro_complete = inet_gro_complete, | |
1770 | }, | |
1771 | }; | |
1772 | ||
1773 | static const struct net_offload ipip_offload = { | |
1774 | .callbacks = { | |
1775 | .gso_segment = inet_gso_segment, | |
1776 | .gro_receive = ipip_gro_receive, | |
1777 | .gro_complete = ipip_gro_complete, | |
1778 | }, | |
1779 | }; | |
1780 | ||
1781 | static int __init ipv4_offload_init(void) | |
1782 | { | |
1783 | /* | |
1784 | * Add offloads | |
1785 | */ | |
1786 | if (udpv4_offload_init() < 0) | |
1787 | pr_crit("%s: Cannot add UDP protocol offload\n", __func__); | |
1788 | if (tcpv4_offload_init() < 0) | |
1789 | pr_crit("%s: Cannot add TCP protocol offload\n", __func__); | |
1790 | ||
1791 | dev_add_offload(&ip_packet_offload); | |
1792 | inet_add_offload(&ipip_offload, IPPROTO_IPIP); | |
1793 | return 0; | |
1794 | } | |
1795 | ||
1796 | fs_initcall(ipv4_offload_init); | |
1797 | ||
1798 | static struct packet_type ip_packet_type __read_mostly = { | |
1799 | .type = cpu_to_be16(ETH_P_IP), | |
1800 | .func = ip_rcv, | |
1801 | }; | |
1802 | ||
1803 | static int __init inet_init(void) | |
1804 | { | |
1805 | struct inet_protosw *q; | |
1806 | struct list_head *r; | |
1807 | int rc = -EINVAL; | |
1808 | ||
1809 | sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); | |
1810 | ||
1811 | rc = proto_register(&tcp_prot, 1); | |
1812 | if (rc) | |
1813 | goto out; | |
1814 | ||
1815 | rc = proto_register(&udp_prot, 1); | |
1816 | if (rc) | |
1817 | goto out_unregister_tcp_proto; | |
1818 | ||
1819 | rc = proto_register(&raw_prot, 1); | |
1820 | if (rc) | |
1821 | goto out_unregister_udp_proto; | |
1822 | ||
1823 | rc = proto_register(&ping_prot, 1); | |
1824 | if (rc) | |
1825 | goto out_unregister_raw_proto; | |
1826 | ||
1827 | /* | |
1828 | * Tell SOCKET that we are alive... | |
1829 | */ | |
1830 | ||
1831 | (void)sock_register(&inet_family_ops); | |
1832 | ||
1833 | #ifdef CONFIG_SYSCTL | |
1834 | ip_static_sysctl_init(); | |
1835 | #endif | |
1836 | ||
1837 | /* | |
1838 | * Add all the base protocols. | |
1839 | */ | |
1840 | ||
1841 | if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) | |
1842 | pr_crit("%s: Cannot add ICMP protocol\n", __func__); | |
1843 | if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) | |
1844 | pr_crit("%s: Cannot add UDP protocol\n", __func__); | |
1845 | if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) | |
1846 | pr_crit("%s: Cannot add TCP protocol\n", __func__); | |
1847 | #ifdef CONFIG_IP_MULTICAST | |
1848 | if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) | |
1849 | pr_crit("%s: Cannot add IGMP protocol\n", __func__); | |
1850 | #endif | |
1851 | ||
1852 | /* Register the socket-side information for inet_create. */ | |
1853 | for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) | |
1854 | INIT_LIST_HEAD(r); | |
1855 | ||
1856 | for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) | |
1857 | inet_register_protosw(q); | |
1858 | ||
1859 | /* | |
1860 | * Set the ARP module up | |
1861 | */ | |
1862 | ||
1863 | arp_init(); | |
1864 | ||
1865 | /* | |
1866 | * Set the IP module up | |
1867 | */ | |
1868 | ||
1869 | ip_init(); | |
1870 | ||
1871 | /* Setup TCP slab cache for open requests. */ | |
1872 | tcp_init(); | |
1873 | ||
1874 | /* Setup UDP memory threshold */ | |
1875 | udp_init(); | |
1876 | ||
1877 | /* Add UDP-Lite (RFC 3828) */ | |
1878 | udplite4_register(); | |
1879 | ||
1880 | ping_init(); | |
1881 | ||
1882 | /* | |
1883 | * Set the ICMP layer up | |
1884 | */ | |
1885 | ||
1886 | if (icmp_init() < 0) | |
1887 | panic("Failed to create the ICMP control socket.\n"); | |
1888 | ||
1889 | /* | |
1890 | * Initialise the multicast router | |
1891 | */ | |
1892 | #if defined(CONFIG_IP_MROUTE) | |
1893 | if (ip_mr_init()) | |
1894 | pr_crit("%s: Cannot init ipv4 mroute\n", __func__); | |
1895 | #endif | |
1896 | ||
1897 | if (init_inet_pernet_ops()) | |
1898 | pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); | |
1899 | /* | |
1900 | * Initialise per-cpu ipv4 mibs | |
1901 | */ | |
1902 | ||
1903 | if (init_ipv4_mibs()) | |
1904 | pr_crit("%s: Cannot init ipv4 mibs\n", __func__); | |
1905 | ||
1906 | ipv4_proc_init(); | |
1907 | ||
1908 | ipfrag_init(); | |
1909 | ||
1910 | dev_add_pack(&ip_packet_type); | |
1911 | ||
1912 | ip_tunnel_core_init(); | |
1913 | ||
1914 | rc = 0; | |
1915 | out: | |
1916 | return rc; | |
1917 | out_unregister_raw_proto: | |
1918 | proto_unregister(&raw_prot); | |
1919 | out_unregister_udp_proto: | |
1920 | proto_unregister(&udp_prot); | |
1921 | out_unregister_tcp_proto: | |
1922 | proto_unregister(&tcp_prot); | |
1923 | goto out; | |
1924 | } | |
1925 | ||
1926 | fs_initcall(inet_init); | |
1927 | ||
1928 | /* ------------------------------------------------------------------------ */ | |
1929 | ||
1930 | #ifdef CONFIG_PROC_FS | |
1931 | static int __init ipv4_proc_init(void) | |
1932 | { | |
1933 | int rc = 0; | |
1934 | ||
1935 | if (raw_proc_init()) | |
1936 | goto out_raw; | |
1937 | if (tcp4_proc_init()) | |
1938 | goto out_tcp; | |
1939 | if (udp4_proc_init()) | |
1940 | goto out_udp; | |
1941 | if (ping_proc_init()) | |
1942 | goto out_ping; | |
1943 | if (ip_misc_proc_init()) | |
1944 | goto out_misc; | |
1945 | out: | |
1946 | return rc; | |
1947 | out_misc: | |
1948 | ping_proc_exit(); | |
1949 | out_ping: | |
1950 | udp4_proc_exit(); | |
1951 | out_udp: | |
1952 | tcp4_proc_exit(); | |
1953 | out_tcp: | |
1954 | raw_proc_exit(); | |
1955 | out_raw: | |
1956 | rc = -ENOMEM; | |
1957 | goto out; | |
1958 | } | |
1959 | ||
1960 | #else /* CONFIG_PROC_FS */ | |
1961 | static int __init ipv4_proc_init(void) | |
1962 | { | |
1963 | return 0; | |
1964 | } | |
1965 | #endif /* CONFIG_PROC_FS */ |