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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * PF_INET protocol family socket handler. | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Florian La Roche, <flla@stud.uni-sb.de> | |
11 | * Alan Cox, <A.Cox@swansea.ac.uk> | |
12 | * | |
13 | * Changes (see also sock.c) | |
14 | * | |
15 | * piggy, | |
16 | * Karl Knutson : Socket protocol table | |
17 | * A.N.Kuznetsov : Socket death error in accept(). | |
18 | * John Richardson : Fix non blocking error in connect() | |
19 | * so sockets that fail to connect | |
20 | * don't return -EINPROGRESS. | |
21 | * Alan Cox : Asynchronous I/O support | |
22 | * Alan Cox : Keep correct socket pointer on sock | |
23 | * structures | |
24 | * when accept() ed | |
25 | * Alan Cox : Semantics of SO_LINGER aren't state | |
26 | * moved to close when you look carefully. | |
27 | * With this fixed and the accept bug fixed | |
28 | * some RPC stuff seems happier. | |
29 | * Niibe Yutaka : 4.4BSD style write async I/O | |
30 | * Alan Cox, | |
31 | * Tony Gale : Fixed reuse semantics. | |
32 | * Alan Cox : bind() shouldn't abort existing but dead | |
33 | * sockets. Stops FTP netin:.. I hope. | |
34 | * Alan Cox : bind() works correctly for RAW sockets. | |
35 | * Note that FreeBSD at least was broken | |
36 | * in this respect so be careful with | |
37 | * compatibility tests... | |
38 | * Alan Cox : routing cache support | |
39 | * Alan Cox : memzero the socket structure for | |
40 | * compactness. | |
41 | * Matt Day : nonblock connect error handler | |
42 | * Alan Cox : Allow large numbers of pending sockets | |
43 | * (eg for big web sites), but only if | |
44 | * specifically application requested. | |
45 | * Alan Cox : New buffering throughout IP. Used | |
46 | * dumbly. | |
47 | * Alan Cox : New buffering now used smartly. | |
48 | * Alan Cox : BSD rather than common sense | |
49 | * interpretation of listen. | |
50 | * Germano Caronni : Assorted small races. | |
51 | * Alan Cox : sendmsg/recvmsg basic support. | |
52 | * Alan Cox : Only sendmsg/recvmsg now supported. | |
53 | * Alan Cox : Locked down bind (see security list). | |
54 | * Alan Cox : Loosened bind a little. | |
55 | * Mike McLagan : ADD/DEL DLCI Ioctls | |
56 | * Willy Konynenberg : Transparent proxying support. | |
57 | * David S. Miller : New socket lookup architecture. | |
58 | * Some other random speedups. | |
59 | * Cyrus Durgin : Cleaned up file for kmod hacks. | |
60 | * Andi Kleen : Fix inet_stream_connect TCP race. | |
61 | * | |
62 | * This program is free software; you can redistribute it and/or | |
63 | * modify it under the terms of the GNU General Public License | |
64 | * as published by the Free Software Foundation; either version | |
65 | * 2 of the License, or (at your option) any later version. | |
66 | */ | |
67 | ||
afd46503 JP |
68 | #define pr_fmt(fmt) "IPv4: " fmt |
69 | ||
f4c50d99 | 70 | #include <linux/err.h> |
1da177e4 LT |
71 | #include <linux/errno.h> |
72 | #include <linux/types.h> | |
73 | #include <linux/socket.h> | |
74 | #include <linux/in.h> | |
75 | #include <linux/kernel.h> | |
d3fc0353 | 76 | #include <linux/kmod.h> |
1da177e4 LT |
77 | #include <linux/sched.h> |
78 | #include <linux/timer.h> | |
79 | #include <linux/string.h> | |
80 | #include <linux/sockios.h> | |
81 | #include <linux/net.h> | |
4fc268d2 | 82 | #include <linux/capability.h> |
1da177e4 LT |
83 | #include <linux/fcntl.h> |
84 | #include <linux/mm.h> | |
85 | #include <linux/interrupt.h> | |
86 | #include <linux/stat.h> | |
87 | #include <linux/init.h> | |
88 | #include <linux/poll.h> | |
89 | #include <linux/netfilter_ipv4.h> | |
b3da2cf3 | 90 | #include <linux/random.h> |
5a0e3ad6 | 91 | #include <linux/slab.h> |
1da177e4 | 92 | |
7c0f6ba6 | 93 | #include <linux/uaccess.h> |
1da177e4 | 94 | |
1da177e4 LT |
95 | #include <linux/inet.h> |
96 | #include <linux/igmp.h> | |
14c85021 | 97 | #include <linux/inetdevice.h> |
1da177e4 | 98 | #include <linux/netdevice.h> |
73cc19f1 | 99 | #include <net/checksum.h> |
1da177e4 LT |
100 | #include <net/ip.h> |
101 | #include <net/protocol.h> | |
102 | #include <net/arp.h> | |
103 | #include <net/route.h> | |
104 | #include <net/ip_fib.h> | |
295f7324 | 105 | #include <net/inet_connection_sock.h> |
1da177e4 LT |
106 | #include <net/tcp.h> |
107 | #include <net/udp.h> | |
ba4e58ec | 108 | #include <net/udplite.h> |
c319b4d7 | 109 | #include <net/ping.h> |
1da177e4 LT |
110 | #include <linux/skbuff.h> |
111 | #include <net/sock.h> | |
112 | #include <net/raw.h> | |
113 | #include <net/icmp.h> | |
1da177e4 | 114 | #include <net/inet_common.h> |
045a0fa0 | 115 | #include <net/ip_tunnels.h> |
1da177e4 | 116 | #include <net/xfrm.h> |
9b4661bd | 117 | #include <net/net_namespace.h> |
aebda156 | 118 | #include <net/secure_seq.h> |
1da177e4 LT |
119 | #ifdef CONFIG_IP_MROUTE |
120 | #include <linux/mroute.h> | |
121 | #endif | |
3236b004 | 122 | #include <net/l3mdev.h> |
1da177e4 | 123 | |
1da177e4 LT |
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 | ||
95766fff HA |
140 | sk_mem_reclaim(sk); |
141 | ||
1da177e4 | 142 | if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { |
3d1427f8 | 143 | pr_err("Attempt to release TCP socket in state %d %p\n", |
1da177e4 LT |
144 | sk->sk_state, sk); |
145 | return; | |
146 | } | |
147 | if (!sock_flag(sk, SOCK_DEAD)) { | |
3d1427f8 | 148 | pr_err("Attempt to release alive inet socket %p\n", sk); |
1da177e4 LT |
149 | return; |
150 | } | |
151 | ||
547b792c IJ |
152 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
153 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); | |
154 | WARN_ON(sk->sk_wmem_queued); | |
155 | WARN_ON(sk->sk_forward_alloc); | |
1da177e4 | 156 | |
f6d8bd05 | 157 | kfree(rcu_dereference_protected(inet->inet_opt, 1)); |
b6c6712a | 158 | dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); |
41063e9d | 159 | dst_release(sk->sk_rx_dst); |
e6848976 | 160 | sk_refcnt_debug_dec(sk); |
1da177e4 | 161 | } |
3d1427f8 | 162 | EXPORT_SYMBOL(inet_sock_destruct); |
1da177e4 LT |
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); | |
c720c7e8 | 180 | if (!inet->inet_num) { |
1da177e4 LT |
181 | if (sk->sk_prot->get_port(sk, 0)) { |
182 | release_sock(sk); | |
183 | return -EAGAIN; | |
184 | } | |
c720c7e8 | 185 | inet->inet_sport = htons(inet->inet_num); |
1da177e4 LT |
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) { | |
cebc5cba | 214 | /* Enable TFO w/o requiring TCP_FASTOPEN socket option. |
8336886f | 215 | * Note that only TCP sockets (SOCK_STREAM) will reach here. |
cebc5cba YC |
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(). | |
8336886f | 219 | */ |
cebc5cba YC |
220 | if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) && |
221 | (sysctl_tcp_fastopen & TFO_SERVER_ENABLE) && | |
0536fcc0 | 222 | !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) { |
cebc5cba | 223 | fastopen_queue_tune(sk, backlog); |
dfea2aa6 | 224 | tcp_fastopen_init_key_once(true); |
8336886f | 225 | } |
cebc5cba | 226 | |
72a3effa | 227 | err = inet_csk_listen_start(sk, backlog); |
1da177e4 LT |
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 | } | |
3d1427f8 | 238 | EXPORT_SYMBOL(inet_listen); |
1da177e4 LT |
239 | |
240 | /* | |
241 | * Create an inet socket. | |
242 | */ | |
243 | ||
3f378b68 EP |
244 | static int inet_create(struct net *net, struct socket *sock, int protocol, |
245 | int kern) | |
1da177e4 LT |
246 | { |
247 | struct sock *sk; | |
1da177e4 LT |
248 | struct inet_protosw *answer; |
249 | struct inet_sock *inet; | |
250 | struct proto *answer_prot; | |
251 | unsigned char answer_flags; | |
bb97d31f | 252 | int try_loading_module = 0; |
86c8f9d1 | 253 | int err; |
1da177e4 | 254 | |
79462ad0 HFS |
255 | if (protocol < 0 || protocol >= IPPROTO_MAX) |
256 | return -EINVAL; | |
257 | ||
1da177e4 LT |
258 | sock->state = SS_UNCONNECTED; |
259 | ||
260 | /* Look for the requested type/protocol pair. */ | |
bb97d31f | 261 | lookup_protocol: |
86c8f9d1 | 262 | err = -ESOCKTNOSUPPORT; |
1da177e4 | 263 | rcu_read_lock(); |
696adfe8 | 264 | list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { |
1da177e4 | 265 | |
696adfe8 | 266 | err = 0; |
1da177e4 LT |
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 | } | |
86c8f9d1 | 280 | err = -EPROTONOSUPPORT; |
1da177e4 LT |
281 | } |
282 | ||
696adfe8 | 283 | if (unlikely(err)) { |
bb97d31f ACM |
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 | ||
1da177e4 | 305 | err = -EPERM; |
52e804c6 EB |
306 | if (sock->type == SOCK_RAW && !kern && |
307 | !ns_capable(net->user_ns, CAP_NET_RAW)) | |
1da177e4 | 308 | goto out_rcu_unlock; |
1da177e4 LT |
309 | |
310 | sock->ops = answer->ops; | |
311 | answer_prot = answer->prot; | |
1da177e4 LT |
312 | answer_flags = answer->flags; |
313 | rcu_read_unlock(); | |
314 | ||
51456b29 | 315 | WARN_ON(!answer_prot->slab); |
1da177e4 LT |
316 | |
317 | err = -ENOBUFS; | |
11aa9c28 | 318 | sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern); |
51456b29 | 319 | if (!sk) |
1da177e4 LT |
320 | goto out; |
321 | ||
322 | err = 0; | |
1da177e4 | 323 | if (INET_PROTOSW_REUSE & answer_flags) |
4a17fd52 | 324 | sk->sk_reuse = SK_CAN_REUSE; |
1da177e4 LT |
325 | |
326 | inet = inet_sk(sk); | |
469de9b9 | 327 | inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; |
1da177e4 | 328 | |
7b2ff18e JO |
329 | inet->nodefrag = 0; |
330 | ||
1da177e4 | 331 | if (SOCK_RAW == sock->type) { |
c720c7e8 | 332 | inet->inet_num = protocol; |
1da177e4 LT |
333 | if (IPPROTO_RAW == protocol) |
334 | inet->hdrincl = 1; | |
335 | } | |
336 | ||
974eda11 | 337 | if (net->ipv4.sysctl_ip_no_pmtu_disc) |
1da177e4 LT |
338 | inet->pmtudisc = IP_PMTUDISC_DONT; |
339 | else | |
340 | inet->pmtudisc = IP_PMTUDISC_WANT; | |
341 | ||
c720c7e8 | 342 | inet->inet_id = 0; |
1da177e4 LT |
343 | |
344 | sock_init_data(sock, sk); | |
345 | ||
346 | sk->sk_destruct = inet_sock_destruct; | |
1da177e4 LT |
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; | |
f771bef9 | 353 | inet->mc_all = 1; |
1da177e4 LT |
354 | inet->mc_index = 0; |
355 | inet->mc_list = NULL; | |
4c507d28 | 356 | inet->rcv_tos = 0; |
1da177e4 | 357 | |
e6848976 | 358 | sk_refcnt_debug_inc(sk); |
1da177e4 | 359 | |
c720c7e8 | 360 | if (inet->inet_num) { |
1da177e4 LT |
361 | /* It assumes that any protocol which allows |
362 | * the user to assign a number at socket | |
363 | * creation time automatically | |
364 | * shares. | |
365 | */ | |
c720c7e8 | 366 | inet->inet_sport = htons(inet->inet_num); |
1da177e4 | 367 | /* Add to protocol hash chains. */ |
086c653f CG |
368 | err = sk->sk_prot->hash(sk); |
369 | if (err) { | |
370 | sk_common_release(sk); | |
371 | goto out; | |
372 | } | |
1da177e4 LT |
373 | } |
374 | ||
375 | if (sk->sk_prot->init) { | |
376 | err = sk->sk_prot->init(sk); | |
61023658 DA |
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) { | |
1da177e4 | 386 | sk_common_release(sk); |
61023658 DA |
387 | goto out; |
388 | } | |
1da177e4 LT |
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 | } | |
3d1427f8 | 429 | EXPORT_SYMBOL(inet_release); |
1da177e4 | 430 | |
1da177e4 LT |
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); | |
3594698a | 436 | struct net *net = sock_net(sk); |
1da177e4 LT |
437 | unsigned short snum; |
438 | int chk_addr_ret; | |
9b8ff518 | 439 | u32 tb_id = RT_TABLE_LOCAL; |
1da177e4 LT |
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 | ||
c349a528 | 451 | if (addr->sin_family != AF_INET) { |
29c486df ED |
452 | /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) |
453 | * only if s_addr is INADDR_ANY. | |
454 | */ | |
c349a528 | 455 | err = -EAFNOSUPPORT; |
29c486df ED |
456 | if (addr->sin_family != AF_UNSPEC || |
457 | addr->sin_addr.s_addr != htonl(INADDR_ANY)) | |
458 | goto out; | |
c349a528 | 459 | } |
d0733d2e | 460 | |
3236b004 | 461 | tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id; |
30bbaa19 | 462 | chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); |
1da177e4 LT |
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; | |
49a60158 | 472 | if (!net->ipv4.sysctl_ip_nonlocal_bind && |
b9fb1506 | 473 | !(inet->freebind || inet->transparent) && |
e6f1cebf | 474 | addr->sin_addr.s_addr != htonl(INADDR_ANY) && |
1da177e4 LT |
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; | |
3594698a EB |
482 | if (snum && snum < PROT_SOCK && |
483 | !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) | |
1da177e4 LT |
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; | |
c720c7e8 | 497 | if (sk->sk_state != TCP_CLOSE || inet->inet_num) |
1da177e4 LT |
498 | goto out_release_sock; |
499 | ||
c720c7e8 | 500 | inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; |
1da177e4 | 501 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) |
c720c7e8 | 502 | inet->inet_saddr = 0; /* Use device */ |
1da177e4 LT |
503 | |
504 | /* Make sure we are allowed to bind here. */ | |
90c337da ED |
505 | if ((snum || !inet->bind_address_no_port) && |
506 | sk->sk_prot->get_port(sk, snum)) { | |
c720c7e8 | 507 | inet->inet_saddr = inet->inet_rcv_saddr = 0; |
1da177e4 LT |
508 | err = -EADDRINUSE; |
509 | goto out_release_sock; | |
510 | } | |
511 | ||
c720c7e8 | 512 | if (inet->inet_rcv_saddr) |
1da177e4 LT |
513 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; |
514 | if (snum) | |
515 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
c720c7e8 ED |
516 | inet->inet_sport = htons(inet->inet_num); |
517 | inet->inet_daddr = 0; | |
518 | inet->inet_dport = 0; | |
1da177e4 LT |
519 | sk_dst_reset(sk); |
520 | err = 0; | |
521 | out_release_sock: | |
522 | release_sock(sk); | |
523 | out: | |
524 | return err; | |
525 | } | |
3d1427f8 | 526 | EXPORT_SYMBOL(inet_bind); |
1da177e4 | 527 | |
5e73ea1a | 528 | int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, |
1da177e4 LT |
529 | int addr_len, int flags) |
530 | { | |
531 | struct sock *sk = sock->sk; | |
532 | ||
6503d961 CG |
533 | if (addr_len < sizeof(uaddr->sa_family)) |
534 | return -EINVAL; | |
1da177e4 LT |
535 | if (uaddr->sa_family == AF_UNSPEC) |
536 | return sk->sk_prot->disconnect(sk, flags); | |
537 | ||
c720c7e8 | 538 | if (!inet_sk(sk)->inet_num && inet_autobind(sk)) |
1da177e4 | 539 | return -EAGAIN; |
e3192690 | 540 | return sk->sk_prot->connect(sk, uaddr, addr_len); |
1da177e4 | 541 | } |
3d1427f8 | 542 | EXPORT_SYMBOL(inet_dgram_connect); |
1da177e4 | 543 | |
783237e8 | 544 | static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) |
1da177e4 | 545 | { |
14135f30 | 546 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
1da177e4 | 547 | |
14135f30 | 548 | add_wait_queue(sk_sleep(sk), &wait); |
783237e8 | 549 | sk->sk_write_pending += writebias; |
1da177e4 LT |
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); | |
14135f30 | 558 | timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); |
1da177e4 LT |
559 | lock_sock(sk); |
560 | if (signal_pending(current) || !timeo) | |
561 | break; | |
1da177e4 | 562 | } |
14135f30 | 563 | remove_wait_queue(sk_sleep(sk), &wait); |
783237e8 | 564 | sk->sk_write_pending -= writebias; |
1da177e4 LT |
565 | return timeo; |
566 | } | |
567 | ||
568 | /* | |
569 | * Connect to a remote host. There is regrettably still a little | |
570 | * TCP 'magic' in here. | |
571 | */ | |
cf60af03 YC |
572 | int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, |
573 | int addr_len, int flags) | |
1da177e4 LT |
574 | { |
575 | struct sock *sk = sock->sk; | |
576 | int err; | |
577 | long timeo; | |
578 | ||
6503d961 CG |
579 | if (addr_len < sizeof(uaddr->sa_family)) |
580 | return -EINVAL; | |
581 | ||
1da177e4 LT |
582 | if (uaddr->sa_family == AF_UNSPEC) { |
583 | err = sk->sk_prot->disconnect(sk, flags); | |
584 | sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; | |
585 | goto out; | |
586 | } | |
587 | ||
588 | switch (sock->state) { | |
589 | default: | |
590 | err = -EINVAL; | |
591 | goto out; | |
592 | case SS_CONNECTED: | |
593 | err = -EISCONN; | |
594 | goto out; | |
595 | case SS_CONNECTING: | |
596 | err = -EALREADY; | |
597 | /* Fall out of switch with err, set for this state */ | |
598 | break; | |
599 | case SS_UNCONNECTED: | |
600 | err = -EISCONN; | |
601 | if (sk->sk_state != TCP_CLOSE) | |
602 | goto out; | |
603 | ||
604 | err = sk->sk_prot->connect(sk, uaddr, addr_len); | |
605 | if (err < 0) | |
606 | goto out; | |
607 | ||
e905a9ed | 608 | sock->state = SS_CONNECTING; |
1da177e4 LT |
609 | |
610 | /* Just entered SS_CONNECTING state; the only | |
611 | * difference is that return value in non-blocking | |
612 | * case is EINPROGRESS, rather than EALREADY. | |
613 | */ | |
614 | err = -EINPROGRESS; | |
615 | break; | |
616 | } | |
617 | ||
618 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); | |
619 | ||
620 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { | |
783237e8 YC |
621 | int writebias = (sk->sk_protocol == IPPROTO_TCP) && |
622 | tcp_sk(sk)->fastopen_req && | |
623 | tcp_sk(sk)->fastopen_req->data ? 1 : 0; | |
624 | ||
1da177e4 | 625 | /* Error code is set above */ |
783237e8 | 626 | if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) |
1da177e4 LT |
627 | goto out; |
628 | ||
629 | err = sock_intr_errno(timeo); | |
630 | if (signal_pending(current)) | |
631 | goto out; | |
632 | } | |
633 | ||
634 | /* Connection was closed by RST, timeout, ICMP error | |
635 | * or another process disconnected us. | |
636 | */ | |
637 | if (sk->sk_state == TCP_CLOSE) | |
638 | goto sock_error; | |
639 | ||
640 | /* sk->sk_err may be not zero now, if RECVERR was ordered by user | |
641 | * and error was received after socket entered established state. | |
642 | * Hence, it is handled normally after connect() return successfully. | |
643 | */ | |
644 | ||
645 | sock->state = SS_CONNECTED; | |
646 | err = 0; | |
647 | out: | |
1da177e4 LT |
648 | return err; |
649 | ||
650 | sock_error: | |
651 | err = sock_error(sk) ? : -ECONNABORTED; | |
652 | sock->state = SS_UNCONNECTED; | |
653 | if (sk->sk_prot->disconnect(sk, flags)) | |
654 | sock->state = SS_DISCONNECTING; | |
655 | goto out; | |
656 | } | |
cf60af03 YC |
657 | EXPORT_SYMBOL(__inet_stream_connect); |
658 | ||
659 | int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, | |
660 | int addr_len, int flags) | |
661 | { | |
662 | int err; | |
663 | ||
664 | lock_sock(sock->sk); | |
665 | err = __inet_stream_connect(sock, uaddr, addr_len, flags); | |
666 | release_sock(sock->sk); | |
667 | return err; | |
668 | } | |
3d1427f8 | 669 | EXPORT_SYMBOL(inet_stream_connect); |
1da177e4 LT |
670 | |
671 | /* | |
672 | * Accept a pending connection. The TCP layer now gives BSD semantics. | |
673 | */ | |
674 | ||
675 | int inet_accept(struct socket *sock, struct socket *newsock, int flags) | |
676 | { | |
677 | struct sock *sk1 = sock->sk; | |
678 | int err = -EINVAL; | |
679 | struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); | |
680 | ||
681 | if (!sk2) | |
682 | goto do_err; | |
683 | ||
684 | lock_sock(sk2); | |
685 | ||
1eddcead | 686 | sock_rps_record_flow(sk2); |
547b792c | 687 | WARN_ON(!((1 << sk2->sk_state) & |
8336886f JC |
688 | (TCPF_ESTABLISHED | TCPF_SYN_RECV | |
689 | TCPF_CLOSE_WAIT | TCPF_CLOSE))); | |
1da177e4 LT |
690 | |
691 | sock_graft(sk2, newsock); | |
692 | ||
693 | newsock->state = SS_CONNECTED; | |
694 | err = 0; | |
695 | release_sock(sk2); | |
696 | do_err: | |
697 | return err; | |
698 | } | |
3d1427f8 | 699 | EXPORT_SYMBOL(inet_accept); |
1da177e4 LT |
700 | |
701 | ||
702 | /* | |
703 | * This does both peername and sockname. | |
704 | */ | |
705 | int inet_getname(struct socket *sock, struct sockaddr *uaddr, | |
706 | int *uaddr_len, int peer) | |
707 | { | |
708 | struct sock *sk = sock->sk; | |
709 | struct inet_sock *inet = inet_sk(sk); | |
38bfd8f5 | 710 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); |
1da177e4 LT |
711 | |
712 | sin->sin_family = AF_INET; | |
713 | if (peer) { | |
c720c7e8 | 714 | if (!inet->inet_dport || |
1da177e4 LT |
715 | (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && |
716 | peer == 1)) | |
717 | return -ENOTCONN; | |
c720c7e8 ED |
718 | sin->sin_port = inet->inet_dport; |
719 | sin->sin_addr.s_addr = inet->inet_daddr; | |
1da177e4 | 720 | } else { |
c720c7e8 | 721 | __be32 addr = inet->inet_rcv_saddr; |
1da177e4 | 722 | if (!addr) |
c720c7e8 ED |
723 | addr = inet->inet_saddr; |
724 | sin->sin_port = inet->inet_sport; | |
1da177e4 LT |
725 | sin->sin_addr.s_addr = addr; |
726 | } | |
727 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
728 | *uaddr_len = sizeof(*sin); | |
729 | return 0; | |
730 | } | |
3d1427f8 | 731 | EXPORT_SYMBOL(inet_getname); |
1da177e4 | 732 | |
1b784140 | 733 | int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
1da177e4 LT |
734 | { |
735 | struct sock *sk = sock->sk; | |
736 | ||
c58dc01b | 737 | sock_rps_record_flow(sk); |
fec5e652 | 738 | |
1da177e4 | 739 | /* We may need to bind the socket. */ |
7ba42910 CG |
740 | if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && |
741 | inet_autobind(sk)) | |
1da177e4 LT |
742 | return -EAGAIN; |
743 | ||
1b784140 | 744 | return sk->sk_prot->sendmsg(sk, msg, size); |
1da177e4 | 745 | } |
3d1427f8 | 746 | EXPORT_SYMBOL(inet_sendmsg); |
1da177e4 | 747 | |
7ba42910 CG |
748 | ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, |
749 | size_t size, int flags) | |
1da177e4 LT |
750 | { |
751 | struct sock *sk = sock->sk; | |
752 | ||
c58dc01b | 753 | sock_rps_record_flow(sk); |
fec5e652 | 754 | |
1da177e4 | 755 | /* We may need to bind the socket. */ |
7ba42910 CG |
756 | if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && |
757 | inet_autobind(sk)) | |
1da177e4 LT |
758 | return -EAGAIN; |
759 | ||
760 | if (sk->sk_prot->sendpage) | |
761 | return sk->sk_prot->sendpage(sk, page, offset, size, flags); | |
762 | return sock_no_sendpage(sock, page, offset, size, flags); | |
763 | } | |
7ba42910 | 764 | EXPORT_SYMBOL(inet_sendpage); |
1da177e4 | 765 | |
1b784140 YX |
766 | int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
767 | int flags) | |
fec5e652 TH |
768 | { |
769 | struct sock *sk = sock->sk; | |
770 | int addr_len = 0; | |
771 | int err; | |
772 | ||
c58dc01b | 773 | sock_rps_record_flow(sk); |
fec5e652 | 774 | |
1b784140 | 775 | err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, |
fec5e652 TH |
776 | flags & ~MSG_DONTWAIT, &addr_len); |
777 | if (err >= 0) | |
778 | msg->msg_namelen = addr_len; | |
779 | return err; | |
780 | } | |
781 | EXPORT_SYMBOL(inet_recvmsg); | |
1da177e4 LT |
782 | |
783 | int inet_shutdown(struct socket *sock, int how) | |
784 | { | |
785 | struct sock *sk = sock->sk; | |
786 | int err = 0; | |
787 | ||
788 | /* This should really check to make sure | |
789 | * the socket is a TCP socket. (WHY AC...) | |
790 | */ | |
791 | how++; /* maps 0->1 has the advantage of making bit 1 rcvs and | |
792 | 1->2 bit 2 snds. | |
793 | 2->3 */ | |
794 | if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ | |
795 | return -EINVAL; | |
796 | ||
797 | lock_sock(sk); | |
798 | if (sock->state == SS_CONNECTING) { | |
799 | if ((1 << sk->sk_state) & | |
800 | (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) | |
801 | sock->state = SS_DISCONNECTING; | |
802 | else | |
803 | sock->state = SS_CONNECTED; | |
804 | } | |
805 | ||
806 | switch (sk->sk_state) { | |
807 | case TCP_CLOSE: | |
808 | err = -ENOTCONN; | |
809 | /* Hack to wake up other listeners, who can poll for | |
810 | POLLHUP, even on eg. unconnected UDP sockets -- RR */ | |
811 | default: | |
812 | sk->sk_shutdown |= how; | |
813 | if (sk->sk_prot->shutdown) | |
814 | sk->sk_prot->shutdown(sk, how); | |
815 | break; | |
816 | ||
817 | /* Remaining two branches are temporary solution for missing | |
818 | * close() in multithreaded environment. It is _not_ a good idea, | |
819 | * but we have no choice until close() is repaired at VFS level. | |
820 | */ | |
821 | case TCP_LISTEN: | |
822 | if (!(how & RCV_SHUTDOWN)) | |
823 | break; | |
824 | /* Fall through */ | |
825 | case TCP_SYN_SENT: | |
826 | err = sk->sk_prot->disconnect(sk, O_NONBLOCK); | |
827 | sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; | |
828 | break; | |
829 | } | |
830 | ||
831 | /* Wake up anyone sleeping in poll. */ | |
832 | sk->sk_state_change(sk); | |
833 | release_sock(sk); | |
834 | return err; | |
835 | } | |
3d1427f8 | 836 | EXPORT_SYMBOL(inet_shutdown); |
1da177e4 LT |
837 | |
838 | /* | |
839 | * ioctl() calls you can issue on an INET socket. Most of these are | |
840 | * device configuration and stuff and very rarely used. Some ioctls | |
841 | * pass on to the socket itself. | |
842 | * | |
843 | * NOTE: I like the idea of a module for the config stuff. ie ifconfig | |
844 | * loads the devconfigure module does its configuring and unloads it. | |
845 | * There's a good 20K of config code hanging around the kernel. | |
846 | */ | |
847 | ||
848 | int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
849 | { | |
850 | struct sock *sk = sock->sk; | |
851 | int err = 0; | |
3b1e0a65 | 852 | struct net *net = sock_net(sk); |
1da177e4 LT |
853 | |
854 | switch (cmd) { | |
3d1427f8 ED |
855 | case SIOCGSTAMP: |
856 | err = sock_get_timestamp(sk, (struct timeval __user *)arg); | |
857 | break; | |
858 | case SIOCGSTAMPNS: | |
859 | err = sock_get_timestampns(sk, (struct timespec __user *)arg); | |
860 | break; | |
861 | case SIOCADDRT: | |
862 | case SIOCDELRT: | |
863 | case SIOCRTMSG: | |
864 | err = ip_rt_ioctl(net, cmd, (void __user *)arg); | |
865 | break; | |
866 | case SIOCDARP: | |
867 | case SIOCGARP: | |
868 | case SIOCSARP: | |
869 | err = arp_ioctl(net, cmd, (void __user *)arg); | |
870 | break; | |
871 | case SIOCGIFADDR: | |
872 | case SIOCSIFADDR: | |
873 | case SIOCGIFBRDADDR: | |
874 | case SIOCSIFBRDADDR: | |
875 | case SIOCGIFNETMASK: | |
876 | case SIOCSIFNETMASK: | |
877 | case SIOCGIFDSTADDR: | |
878 | case SIOCSIFDSTADDR: | |
879 | case SIOCSIFPFLAGS: | |
880 | case SIOCGIFPFLAGS: | |
881 | case SIOCSIFFLAGS: | |
882 | err = devinet_ioctl(net, cmd, (void __user *)arg); | |
883 | break; | |
884 | default: | |
885 | if (sk->sk_prot->ioctl) | |
886 | err = sk->sk_prot->ioctl(sk, cmd, arg); | |
887 | else | |
888 | err = -ENOIOCTLCMD; | |
889 | break; | |
1da177e4 LT |
890 | } |
891 | return err; | |
892 | } | |
3d1427f8 | 893 | EXPORT_SYMBOL(inet_ioctl); |
1da177e4 | 894 | |
709b46e8 | 895 | #ifdef CONFIG_COMPAT |
686dc6b6 | 896 | static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
709b46e8 EB |
897 | { |
898 | struct sock *sk = sock->sk; | |
899 | int err = -ENOIOCTLCMD; | |
900 | ||
901 | if (sk->sk_prot->compat_ioctl) | |
902 | err = sk->sk_prot->compat_ioctl(sk, cmd, arg); | |
903 | ||
904 | return err; | |
905 | } | |
906 | #endif | |
907 | ||
90ddc4f0 | 908 | const struct proto_ops inet_stream_ops = { |
543d9cfe ACM |
909 | .family = PF_INET, |
910 | .owner = THIS_MODULE, | |
911 | .release = inet_release, | |
912 | .bind = inet_bind, | |
913 | .connect = inet_stream_connect, | |
914 | .socketpair = sock_no_socketpair, | |
915 | .accept = inet_accept, | |
916 | .getname = inet_getname, | |
917 | .poll = tcp_poll, | |
918 | .ioctl = inet_ioctl, | |
919 | .listen = inet_listen, | |
920 | .shutdown = inet_shutdown, | |
921 | .setsockopt = sock_common_setsockopt, | |
922 | .getsockopt = sock_common_getsockopt, | |
7ba42910 | 923 | .sendmsg = inet_sendmsg, |
fec5e652 | 924 | .recvmsg = inet_recvmsg, |
543d9cfe | 925 | .mmap = sock_no_mmap, |
7ba42910 | 926 | .sendpage = inet_sendpage, |
9c55e01c | 927 | .splice_read = tcp_splice_read, |
32035585 TH |
928 | .read_sock = tcp_read_sock, |
929 | .peek_len = tcp_peek_len, | |
3fdadf7d | 930 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
931 | .compat_setsockopt = compat_sock_common_setsockopt, |
932 | .compat_getsockopt = compat_sock_common_getsockopt, | |
709b46e8 | 933 | .compat_ioctl = inet_compat_ioctl, |
3fdadf7d | 934 | #endif |
1da177e4 | 935 | }; |
3d1427f8 | 936 | EXPORT_SYMBOL(inet_stream_ops); |
1da177e4 | 937 | |
90ddc4f0 | 938 | const struct proto_ops inet_dgram_ops = { |
543d9cfe ACM |
939 | .family = PF_INET, |
940 | .owner = THIS_MODULE, | |
941 | .release = inet_release, | |
942 | .bind = inet_bind, | |
943 | .connect = inet_dgram_connect, | |
944 | .socketpair = sock_no_socketpair, | |
945 | .accept = sock_no_accept, | |
946 | .getname = inet_getname, | |
947 | .poll = udp_poll, | |
948 | .ioctl = inet_ioctl, | |
949 | .listen = sock_no_listen, | |
950 | .shutdown = inet_shutdown, | |
951 | .setsockopt = sock_common_setsockopt, | |
952 | .getsockopt = sock_common_getsockopt, | |
953 | .sendmsg = inet_sendmsg, | |
fec5e652 | 954 | .recvmsg = inet_recvmsg, |
543d9cfe ACM |
955 | .mmap = sock_no_mmap, |
956 | .sendpage = inet_sendpage, | |
627d2d6b | 957 | .set_peek_off = sk_set_peek_off, |
3fdadf7d | 958 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
959 | .compat_setsockopt = compat_sock_common_setsockopt, |
960 | .compat_getsockopt = compat_sock_common_getsockopt, | |
709b46e8 | 961 | .compat_ioctl = inet_compat_ioctl, |
3fdadf7d | 962 | #endif |
1da177e4 | 963 | }; |
3d1427f8 | 964 | EXPORT_SYMBOL(inet_dgram_ops); |
1da177e4 LT |
965 | |
966 | /* | |
967 | * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without | |
968 | * udp_poll | |
969 | */ | |
90ddc4f0 | 970 | static const struct proto_ops inet_sockraw_ops = { |
543d9cfe ACM |
971 | .family = PF_INET, |
972 | .owner = THIS_MODULE, | |
973 | .release = inet_release, | |
974 | .bind = inet_bind, | |
975 | .connect = inet_dgram_connect, | |
976 | .socketpair = sock_no_socketpair, | |
977 | .accept = sock_no_accept, | |
978 | .getname = inet_getname, | |
979 | .poll = datagram_poll, | |
980 | .ioctl = inet_ioctl, | |
981 | .listen = sock_no_listen, | |
982 | .shutdown = inet_shutdown, | |
983 | .setsockopt = sock_common_setsockopt, | |
984 | .getsockopt = sock_common_getsockopt, | |
985 | .sendmsg = inet_sendmsg, | |
fec5e652 | 986 | .recvmsg = inet_recvmsg, |
543d9cfe ACM |
987 | .mmap = sock_no_mmap, |
988 | .sendpage = inet_sendpage, | |
3fdadf7d | 989 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
990 | .compat_setsockopt = compat_sock_common_setsockopt, |
991 | .compat_getsockopt = compat_sock_common_getsockopt, | |
709b46e8 | 992 | .compat_ioctl = inet_compat_ioctl, |
3fdadf7d | 993 | #endif |
1da177e4 LT |
994 | }; |
995 | ||
ec1b4cf7 | 996 | static const struct net_proto_family inet_family_ops = { |
1da177e4 LT |
997 | .family = PF_INET, |
998 | .create = inet_create, | |
999 | .owner = THIS_MODULE, | |
1000 | }; | |
1001 | ||
1da177e4 LT |
1002 | /* Upon startup we insert all the elements in inetsw_array[] into |
1003 | * the linked list inetsw. | |
1004 | */ | |
1005 | static struct inet_protosw inetsw_array[] = | |
1006 | { | |
e905a9ed YH |
1007 | { |
1008 | .type = SOCK_STREAM, | |
1009 | .protocol = IPPROTO_TCP, | |
1010 | .prot = &tcp_prot, | |
1011 | .ops = &inet_stream_ops, | |
e905a9ed | 1012 | .flags = INET_PROTOSW_PERMANENT | |
d83d8461 | 1013 | INET_PROTOSW_ICSK, |
e905a9ed YH |
1014 | }, |
1015 | ||
1016 | { | |
1017 | .type = SOCK_DGRAM, | |
1018 | .protocol = IPPROTO_UDP, | |
1019 | .prot = &udp_prot, | |
1020 | .ops = &inet_dgram_ops, | |
e905a9ed | 1021 | .flags = INET_PROTOSW_PERMANENT, |
1da177e4 | 1022 | }, |
e905a9ed | 1023 | |
c319b4d7 VK |
1024 | { |
1025 | .type = SOCK_DGRAM, | |
1026 | .protocol = IPPROTO_ICMP, | |
1027 | .prot = &ping_prot, | |
1028 | .ops = &inet_dgram_ops, | |
c319b4d7 VK |
1029 | .flags = INET_PROTOSW_REUSE, |
1030 | }, | |
1da177e4 LT |
1031 | |
1032 | { | |
e905a9ed YH |
1033 | .type = SOCK_RAW, |
1034 | .protocol = IPPROTO_IP, /* wild card */ | |
1035 | .prot = &raw_prot, | |
1036 | .ops = &inet_sockraw_ops, | |
e905a9ed | 1037 | .flags = INET_PROTOSW_REUSE, |
1da177e4 LT |
1038 | } |
1039 | }; | |
1040 | ||
c40f6fff | 1041 | #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) |
1da177e4 LT |
1042 | |
1043 | void inet_register_protosw(struct inet_protosw *p) | |
1044 | { | |
1045 | struct list_head *lh; | |
1046 | struct inet_protosw *answer; | |
1047 | int protocol = p->protocol; | |
1048 | struct list_head *last_perm; | |
1049 | ||
1050 | spin_lock_bh(&inetsw_lock); | |
1051 | ||
1052 | if (p->type >= SOCK_MAX) | |
1053 | goto out_illegal; | |
1054 | ||
1055 | /* If we are trying to override a permanent protocol, bail. */ | |
1da177e4 LT |
1056 | last_perm = &inetsw[p->type]; |
1057 | list_for_each(lh, &inetsw[p->type]) { | |
1058 | answer = list_entry(lh, struct inet_protosw, list); | |
1da177e4 | 1059 | /* Check only the non-wild match. */ |
f6c53334 JZ |
1060 | if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) |
1061 | break; | |
1062 | if (protocol == answer->protocol) | |
1063 | goto out_permanent; | |
1064 | last_perm = lh; | |
1da177e4 | 1065 | } |
1da177e4 LT |
1066 | |
1067 | /* Add the new entry after the last permanent entry if any, so that | |
1068 | * the new entry does not override a permanent entry when matched with | |
1069 | * a wild-card protocol. But it is allowed to override any existing | |
e905a9ed | 1070 | * non-permanent entry. This means that when we remove this entry, the |
1da177e4 LT |
1071 | * system automatically returns to the old behavior. |
1072 | */ | |
1073 | list_add_rcu(&p->list, last_perm); | |
1074 | out: | |
1075 | spin_unlock_bh(&inetsw_lock); | |
1076 | ||
1da177e4 LT |
1077 | return; |
1078 | ||
1079 | out_permanent: | |
058bd4d2 | 1080 | pr_err("Attempt to override permanent protocol %d\n", protocol); |
1da177e4 LT |
1081 | goto out; |
1082 | ||
1083 | out_illegal: | |
058bd4d2 | 1084 | pr_err("Ignoring attempt to register invalid socket type %d\n", |
1da177e4 LT |
1085 | p->type); |
1086 | goto out; | |
1087 | } | |
3d1427f8 | 1088 | EXPORT_SYMBOL(inet_register_protosw); |
1da177e4 LT |
1089 | |
1090 | void inet_unregister_protosw(struct inet_protosw *p) | |
1091 | { | |
1092 | if (INET_PROTOSW_PERMANENT & p->flags) { | |
058bd4d2 | 1093 | pr_err("Attempt to unregister permanent protocol %d\n", |
1da177e4 LT |
1094 | p->protocol); |
1095 | } else { | |
1096 | spin_lock_bh(&inetsw_lock); | |
1097 | list_del_rcu(&p->list); | |
1098 | spin_unlock_bh(&inetsw_lock); | |
1099 | ||
1100 | synchronize_net(); | |
1101 | } | |
1102 | } | |
3d1427f8 | 1103 | EXPORT_SYMBOL(inet_unregister_protosw); |
1da177e4 | 1104 | |
32519f11 ACM |
1105 | static int inet_sk_reselect_saddr(struct sock *sk) |
1106 | { | |
1107 | struct inet_sock *inet = inet_sk(sk); | |
c720c7e8 | 1108 | __be32 old_saddr = inet->inet_saddr; |
c720c7e8 | 1109 | __be32 daddr = inet->inet_daddr; |
6e869138 | 1110 | struct flowi4 *fl4; |
b23dd4fe DM |
1111 | struct rtable *rt; |
1112 | __be32 new_saddr; | |
f6d8bd05 | 1113 | struct ip_options_rcu *inet_opt; |
32519f11 | 1114 | |
f6d8bd05 | 1115 | inet_opt = rcu_dereference_protected(inet->inet_opt, |
1e1d04e6 | 1116 | lockdep_sock_is_held(sk)); |
f6d8bd05 ED |
1117 | if (inet_opt && inet_opt->opt.srr) |
1118 | daddr = inet_opt->opt.faddr; | |
32519f11 ACM |
1119 | |
1120 | /* Query new route. */ | |
6e869138 DM |
1121 | fl4 = &inet->cork.fl.u.ip4; |
1122 | rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), | |
b23dd4fe | 1123 | sk->sk_bound_dev_if, sk->sk_protocol, |
0e0d44ab | 1124 | inet->inet_sport, inet->inet_dport, sk); |
b23dd4fe DM |
1125 | if (IS_ERR(rt)) |
1126 | return PTR_ERR(rt); | |
32519f11 | 1127 | |
d8d1f30b | 1128 | sk_setup_caps(sk, &rt->dst); |
32519f11 | 1129 | |
6e869138 | 1130 | new_saddr = fl4->saddr; |
32519f11 ACM |
1131 | |
1132 | if (new_saddr == old_saddr) | |
1133 | return 0; | |
1134 | ||
287b7f38 | 1135 | if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) { |
058bd4d2 JP |
1136 | pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", |
1137 | __func__, &old_saddr, &new_saddr); | |
32519f11 ACM |
1138 | } |
1139 | ||
c720c7e8 | 1140 | inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; |
32519f11 ACM |
1141 | |
1142 | /* | |
1143 | * XXX The only one ugly spot where we need to | |
1144 | * XXX really change the sockets identity after | |
1145 | * XXX it has entered the hashes. -DaveM | |
1146 | * | |
1147 | * Besides that, it does not check for connection | |
1148 | * uniqueness. Wait for troubles. | |
1149 | */ | |
086c653f | 1150 | return __sk_prot_rehash(sk); |
32519f11 ACM |
1151 | } |
1152 | ||
1153 | int inet_sk_rebuild_header(struct sock *sk) | |
1154 | { | |
1155 | struct inet_sock *inet = inet_sk(sk); | |
1156 | struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); | |
3ca3c68e | 1157 | __be32 daddr; |
f6d8bd05 | 1158 | struct ip_options_rcu *inet_opt; |
6e869138 | 1159 | struct flowi4 *fl4; |
32519f11 ACM |
1160 | int err; |
1161 | ||
1162 | /* Route is OK, nothing to do. */ | |
1163 | if (rt) | |
1164 | return 0; | |
1165 | ||
1166 | /* Reroute. */ | |
f6d8bd05 ED |
1167 | rcu_read_lock(); |
1168 | inet_opt = rcu_dereference(inet->inet_opt); | |
c720c7e8 | 1169 | daddr = inet->inet_daddr; |
f6d8bd05 ED |
1170 | if (inet_opt && inet_opt->opt.srr) |
1171 | daddr = inet_opt->opt.faddr; | |
1172 | rcu_read_unlock(); | |
6e869138 DM |
1173 | fl4 = &inet->cork.fl.u.ip4; |
1174 | rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, | |
78fbfd8a DM |
1175 | inet->inet_dport, inet->inet_sport, |
1176 | sk->sk_protocol, RT_CONN_FLAGS(sk), | |
1177 | sk->sk_bound_dev_if); | |
b23dd4fe DM |
1178 | if (!IS_ERR(rt)) { |
1179 | err = 0; | |
d8d1f30b | 1180 | sk_setup_caps(sk, &rt->dst); |
b23dd4fe DM |
1181 | } else { |
1182 | err = PTR_ERR(rt); | |
1183 | ||
32519f11 ACM |
1184 | /* Routing failed... */ |
1185 | sk->sk_route_caps = 0; | |
1186 | /* | |
1187 | * Other protocols have to map its equivalent state to TCP_SYN_SENT. | |
1188 | * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme | |
1189 | */ | |
287b7f38 | 1190 | if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr || |
32519f11 ACM |
1191 | sk->sk_state != TCP_SYN_SENT || |
1192 | (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || | |
1193 | (err = inet_sk_reselect_saddr(sk)) != 0) | |
1194 | sk->sk_err_soft = -err; | |
1195 | } | |
1196 | ||
1197 | return err; | |
1198 | } | |
32519f11 ACM |
1199 | EXPORT_SYMBOL(inet_sk_rebuild_header); |
1200 | ||
b8921ca8 TH |
1201 | struct sk_buff *inet_gso_segment(struct sk_buff *skb, |
1202 | netdev_features_t features) | |
f4c50d99 | 1203 | { |
07b26c94 | 1204 | bool udpfrag = false, fixedid = false, gso_partial, encap; |
f4c50d99 | 1205 | struct sk_buff *segs = ERR_PTR(-EINVAL); |
bca49f84 | 1206 | const struct net_offload *ops; |
3347c960 | 1207 | unsigned int offset = 0; |
f9242b6b | 1208 | struct iphdr *iph; |
802ab55a | 1209 | int proto, tot_len; |
3347c960 | 1210 | int nhoff; |
f4c50d99 HX |
1211 | int ihl; |
1212 | int id; | |
1213 | ||
3347c960 ED |
1214 | skb_reset_network_header(skb); |
1215 | nhoff = skb_network_header(skb) - skb_mac_header(skb); | |
bbcf467d | 1216 | if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) |
f4c50d99 HX |
1217 | goto out; |
1218 | ||
eddc9ec5 | 1219 | iph = ip_hdr(skb); |
f4c50d99 HX |
1220 | ihl = iph->ihl * 4; |
1221 | if (ihl < sizeof(*iph)) | |
1222 | goto out; | |
1223 | ||
47d27aad ED |
1224 | id = ntohs(iph->id); |
1225 | proto = iph->protocol; | |
1226 | ||
1227 | /* Warning: after this point, iph might be no longer valid */ | |
bbcf467d | 1228 | if (unlikely(!pskb_may_pull(skb, ihl))) |
f4c50d99 | 1229 | goto out; |
47d27aad | 1230 | __skb_pull(skb, ihl); |
f4c50d99 | 1231 | |
8c3a897b ED |
1232 | encap = SKB_GSO_CB(skb)->encap_level > 0; |
1233 | if (encap) | |
1e16aa3d | 1234 | features &= skb->dev->hw_enc_features; |
3347c960 | 1235 | SKB_GSO_CB(skb)->encap_level += ihl; |
73136267 | 1236 | |
badff6d0 | 1237 | skb_reset_transport_header(skb); |
47d27aad | 1238 | |
f4c50d99 HX |
1239 | segs = ERR_PTR(-EPROTONOSUPPORT); |
1240 | ||
cbc53e08 AD |
1241 | if (!skb->encapsulation || encap) { |
1242 | udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); | |
1243 | fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID); | |
1244 | ||
1245 | /* fixed ID is invalid if DF bit is not set */ | |
a5108878 | 1246 | if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF))) |
cbc53e08 AD |
1247 | goto out; |
1248 | } | |
dcd60771 | 1249 | |
bca49f84 | 1250 | ops = rcu_dereference(inet_offloads[proto]); |
f191a1d1 VY |
1251 | if (likely(ops && ops->callbacks.gso_segment)) |
1252 | segs = ops->callbacks.gso_segment(skb, features); | |
f4c50d99 | 1253 | |
50c3a487 | 1254 | if (IS_ERR_OR_NULL(segs)) |
f4c50d99 HX |
1255 | goto out; |
1256 | ||
07b26c94 SK |
1257 | gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); |
1258 | ||
f4c50d99 HX |
1259 | skb = segs; |
1260 | do { | |
3347c960 | 1261 | iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); |
8c3a897b | 1262 | if (udpfrag) { |
d7ca4cc0 | 1263 | iph->frag_off = htons(offset >> 3); |
00db4124 | 1264 | if (skb->next) |
d7ca4cc0 | 1265 | iph->frag_off |= htons(IP_MF); |
3347c960 | 1266 | offset += skb->len - nhoff - ihl; |
802ab55a AD |
1267 | tot_len = skb->len - nhoff; |
1268 | } else if (skb_is_gso(skb)) { | |
1269 | if (!fixedid) { | |
1270 | iph->id = htons(id); | |
1271 | id += skb_shinfo(skb)->gso_segs; | |
1272 | } | |
07b26c94 SK |
1273 | |
1274 | if (gso_partial) | |
1275 | tot_len = skb_shinfo(skb)->gso_size + | |
1276 | SKB_GSO_CB(skb)->data_offset + | |
1277 | skb->head - (unsigned char *)iph; | |
1278 | else | |
1279 | tot_len = skb->len - nhoff; | |
802ab55a AD |
1280 | } else { |
1281 | if (!fixedid) | |
1282 | iph->id = htons(id++); | |
1283 | tot_len = skb->len - nhoff; | |
490ab081 | 1284 | } |
802ab55a | 1285 | iph->tot_len = htons(tot_len); |
47d27aad | 1286 | ip_send_check(iph); |
8c3a897b | 1287 | if (encap) |
3347c960 | 1288 | skb_reset_inner_headers(skb); |
3347c960 | 1289 | skb->network_header = (u8 *)iph - skb->head; |
f4c50d99 HX |
1290 | } while ((skb = skb->next)); |
1291 | ||
1292 | out: | |
1293 | return segs; | |
1294 | } | |
b8921ca8 | 1295 | EXPORT_SYMBOL(inet_gso_segment); |
f4c50d99 | 1296 | |
b8921ca8 | 1297 | struct sk_buff **inet_gro_receive(struct sk_buff **head, struct sk_buff *skb) |
73cc19f1 | 1298 | { |
bca49f84 | 1299 | const struct net_offload *ops; |
73cc19f1 HX |
1300 | struct sk_buff **pp = NULL; |
1301 | struct sk_buff *p; | |
b71d1d42 | 1302 | const struct iphdr *iph; |
a5b1cf28 HX |
1303 | unsigned int hlen; |
1304 | unsigned int off; | |
1075f3f6 | 1305 | unsigned int id; |
73cc19f1 HX |
1306 | int flush = 1; |
1307 | int proto; | |
73cc19f1 | 1308 | |
a5b1cf28 HX |
1309 | off = skb_gro_offset(skb); |
1310 | hlen = off + sizeof(*iph); | |
1311 | iph = skb_gro_header_fast(skb, off); | |
1312 | if (skb_gro_header_hard(skb, hlen)) { | |
1313 | iph = skb_gro_header_slow(skb, hlen, off); | |
1314 | if (unlikely(!iph)) | |
1315 | goto out; | |
1316 | } | |
73cc19f1 | 1317 | |
f9242b6b | 1318 | proto = iph->protocol; |
73cc19f1 HX |
1319 | |
1320 | rcu_read_lock(); | |
bca49f84 | 1321 | ops = rcu_dereference(inet_offloads[proto]); |
f191a1d1 | 1322 | if (!ops || !ops->callbacks.gro_receive) |
73cc19f1 HX |
1323 | goto out_unlock; |
1324 | ||
a5ad24be | 1325 | if (*(u8 *)iph != 0x45) |
73cc19f1 HX |
1326 | goto out_unlock; |
1327 | ||
a9e050f4 | 1328 | if (unlikely(ip_fast_csum((u8 *)iph, 5))) |
73cc19f1 HX |
1329 | goto out_unlock; |
1330 | ||
0eae88f3 | 1331 | id = ntohl(*(__be32 *)&iph->id); |
db8caf3d | 1332 | flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); |
1075f3f6 | 1333 | id >>= 16; |
73cc19f1 HX |
1334 | |
1335 | for (p = *head; p; p = p->next) { | |
1336 | struct iphdr *iph2; | |
1530545e | 1337 | u16 flush_id; |
73cc19f1 HX |
1338 | |
1339 | if (!NAPI_GRO_CB(p)->same_flow) | |
1340 | continue; | |
1341 | ||
299603e8 JC |
1342 | iph2 = (struct iphdr *)(p->data + off); |
1343 | /* The above works because, with the exception of the top | |
1344 | * (inner most) layer, we only aggregate pkts with the same | |
1345 | * hdr length so all the hdrs we'll need to verify will start | |
1346 | * at the same offset. | |
1347 | */ | |
a5ad24be | 1348 | if ((iph->protocol ^ iph2->protocol) | |
0eae88f3 ED |
1349 | ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | |
1350 | ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { | |
73cc19f1 HX |
1351 | NAPI_GRO_CB(p)->same_flow = 0; |
1352 | continue; | |
1353 | } | |
1354 | ||
1355 | /* All fields must match except length and checksum. */ | |
1356 | NAPI_GRO_CB(p)->flush |= | |
a5ad24be | 1357 | (iph->ttl ^ iph2->ttl) | |
a9e050f4 | 1358 | (iph->tos ^ iph2->tos) | |
bf5a755f | 1359 | ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); |
73cc19f1 HX |
1360 | |
1361 | NAPI_GRO_CB(p)->flush |= flush; | |
1530545e AD |
1362 | |
1363 | /* We need to store of the IP ID check to be included later | |
1364 | * when we can verify that this packet does in fact belong | |
1365 | * to a given flow. | |
1366 | */ | |
1367 | flush_id = (u16)(id - ntohs(iph2->id)); | |
1368 | ||
1369 | /* This bit of code makes it much easier for us to identify | |
1370 | * the cases where we are doing atomic vs non-atomic IP ID | |
1371 | * checks. Specifically an atomic check can return IP ID | |
1372 | * values 0 - 0xFFFF, while a non-atomic check can only | |
1373 | * return 0 or 0xFFFF. | |
1374 | */ | |
1375 | if (!NAPI_GRO_CB(p)->is_atomic || | |
1376 | !(iph->frag_off & htons(IP_DF))) { | |
1377 | flush_id ^= NAPI_GRO_CB(p)->count; | |
1378 | flush_id = flush_id ? 0xFFFF : 0; | |
1379 | } | |
1380 | ||
1381 | /* If the previous IP ID value was based on an atomic | |
1382 | * datagram we can overwrite the value and ignore it. | |
1383 | */ | |
1384 | if (NAPI_GRO_CB(skb)->is_atomic) | |
1385 | NAPI_GRO_CB(p)->flush_id = flush_id; | |
1386 | else | |
1387 | NAPI_GRO_CB(p)->flush_id |= flush_id; | |
73cc19f1 HX |
1388 | } |
1389 | ||
1530545e | 1390 | NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF)); |
73cc19f1 | 1391 | NAPI_GRO_CB(skb)->flush |= flush; |
299603e8 JC |
1392 | skb_set_network_header(skb, off); |
1393 | /* The above will be needed by the transport layer if there is one | |
1394 | * immediately following this IP hdr. | |
1395 | */ | |
1396 | ||
2c804d0f ED |
1397 | /* Note : No need to call skb_gro_postpull_rcsum() here, |
1398 | * as we already checked checksum over ipv4 header was 0 | |
1399 | */ | |
86911732 HX |
1400 | skb_gro_pull(skb, sizeof(*iph)); |
1401 | skb_set_transport_header(skb, skb_gro_offset(skb)); | |
73cc19f1 | 1402 | |
fcd91dd4 | 1403 | pp = call_gro_receive(ops->callbacks.gro_receive, head, skb); |
73cc19f1 HX |
1404 | |
1405 | out_unlock: | |
1406 | rcu_read_unlock(); | |
1407 | ||
1408 | out: | |
1409 | NAPI_GRO_CB(skb)->flush |= flush; | |
1410 | ||
1411 | return pp; | |
1412 | } | |
b8921ca8 | 1413 | EXPORT_SYMBOL(inet_gro_receive); |
73cc19f1 | 1414 | |
fac8e0f5 JG |
1415 | static struct sk_buff **ipip_gro_receive(struct sk_buff **head, |
1416 | struct sk_buff *skb) | |
1417 | { | |
1418 | if (NAPI_GRO_CB(skb)->encap_mark) { | |
1419 | NAPI_GRO_CB(skb)->flush = 1; | |
1420 | return NULL; | |
1421 | } | |
1422 | ||
1423 | NAPI_GRO_CB(skb)->encap_mark = 1; | |
1424 | ||
1425 | return inet_gro_receive(head, skb); | |
1426 | } | |
1427 | ||
822c8685 DD |
1428 | #define SECONDS_PER_DAY 86400 |
1429 | ||
1430 | /* inet_current_timestamp - Return IP network timestamp | |
1431 | * | |
1432 | * Return milliseconds since midnight in network byte order. | |
1433 | */ | |
1434 | __be32 inet_current_timestamp(void) | |
1435 | { | |
1436 | u32 secs; | |
1437 | u32 msecs; | |
1438 | struct timespec64 ts; | |
1439 | ||
1440 | ktime_get_real_ts64(&ts); | |
1441 | ||
1442 | /* Get secs since midnight. */ | |
1443 | (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs); | |
1444 | /* Convert to msecs. */ | |
1445 | msecs = secs * MSEC_PER_SEC; | |
1446 | /* Convert nsec to msec. */ | |
1447 | msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC; | |
1448 | ||
1449 | /* Convert to network byte order. */ | |
3ba9d300 | 1450 | return htonl(msecs); |
822c8685 DD |
1451 | } |
1452 | EXPORT_SYMBOL(inet_current_timestamp); | |
1453 | ||
f4713a3d WB |
1454 | int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1455 | { | |
1456 | if (sk->sk_family == AF_INET) | |
1457 | return ip_recv_error(sk, msg, len, addr_len); | |
1458 | #if IS_ENABLED(CONFIG_IPV6) | |
1459 | if (sk->sk_family == AF_INET6) | |
1460 | return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); | |
1461 | #endif | |
1462 | return -EINVAL; | |
1463 | } | |
1464 | ||
b8921ca8 | 1465 | int inet_gro_complete(struct sk_buff *skb, int nhoff) |
73cc19f1 | 1466 | { |
299603e8 JC |
1467 | __be16 newlen = htons(skb->len - nhoff); |
1468 | struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); | |
bca49f84 | 1469 | const struct net_offload *ops; |
f9242b6b | 1470 | int proto = iph->protocol; |
73cc19f1 | 1471 | int err = -ENOSYS; |
73cc19f1 | 1472 | |
c3caf119 JC |
1473 | if (skb->encapsulation) |
1474 | skb_set_inner_network_header(skb, nhoff); | |
1475 | ||
73cc19f1 HX |
1476 | csum_replace2(&iph->check, iph->tot_len, newlen); |
1477 | iph->tot_len = newlen; | |
1478 | ||
1479 | rcu_read_lock(); | |
bca49f84 | 1480 | ops = rcu_dereference(inet_offloads[proto]); |
f191a1d1 | 1481 | if (WARN_ON(!ops || !ops->callbacks.gro_complete)) |
73cc19f1 HX |
1482 | goto out_unlock; |
1483 | ||
299603e8 JC |
1484 | /* Only need to add sizeof(*iph) to get to the next hdr below |
1485 | * because any hdr with option will have been flushed in | |
1486 | * inet_gro_receive(). | |
1487 | */ | |
1488 | err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph)); | |
73cc19f1 HX |
1489 | |
1490 | out_unlock: | |
1491 | rcu_read_unlock(); | |
1492 | ||
1493 | return err; | |
1494 | } | |
b8921ca8 | 1495 | EXPORT_SYMBOL(inet_gro_complete); |
73cc19f1 | 1496 | |
b8cba75b JG |
1497 | static int ipip_gro_complete(struct sk_buff *skb, int nhoff) |
1498 | { | |
1499 | skb->encapsulation = 1; | |
7e13318d | 1500 | skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4; |
b8cba75b JG |
1501 | return inet_gro_complete(skb, nhoff); |
1502 | } | |
1503 | ||
eee4fe4d | 1504 | int inet_ctl_sock_create(struct sock **sk, unsigned short family, |
5677242f DL |
1505 | unsigned short type, unsigned char protocol, |
1506 | struct net *net) | |
3d58b5fa | 1507 | { |
eee4fe4d | 1508 | struct socket *sock; |
26abe143 | 1509 | int rc = sock_create_kern(net, family, type, protocol, &sock); |
3d58b5fa DL |
1510 | |
1511 | if (rc == 0) { | |
eee4fe4d DL |
1512 | *sk = sock->sk; |
1513 | (*sk)->sk_allocation = GFP_ATOMIC; | |
3d58b5fa DL |
1514 | /* |
1515 | * Unhash it so that IP input processing does not even see it, | |
1516 | * we do not wish this socket to see incoming packets. | |
1517 | */ | |
eee4fe4d | 1518 | (*sk)->sk_prot->unhash(*sk); |
3d58b5fa DL |
1519 | } |
1520 | return rc; | |
1521 | } | |
3d58b5fa DL |
1522 | EXPORT_SYMBOL_GPL(inet_ctl_sock_create); |
1523 | ||
c4c6bc31 R |
1524 | u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt) |
1525 | { | |
1526 | return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt); | |
1527 | } | |
1528 | EXPORT_SYMBOL_GPL(snmp_get_cpu_field); | |
1529 | ||
698365fa | 1530 | unsigned long snmp_fold_field(void __percpu *mib, int offt) |
5e0f0435 HX |
1531 | { |
1532 | unsigned long res = 0; | |
698365fa | 1533 | int i; |
5e0f0435 | 1534 | |
698365fa | 1535 | for_each_possible_cpu(i) |
c4c6bc31 | 1536 | res += snmp_get_cpu_field(mib, i, offt); |
5e0f0435 HX |
1537 | return res; |
1538 | } | |
1539 | EXPORT_SYMBOL_GPL(snmp_fold_field); | |
1540 | ||
4ce3c183 ED |
1541 | #if BITS_PER_LONG==32 |
1542 | ||
80ec1927 | 1543 | u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, |
c4c6bc31 R |
1544 | size_t syncp_offset) |
1545 | { | |
1546 | void *bhptr; | |
1547 | struct u64_stats_sync *syncp; | |
1548 | u64 v; | |
1549 | unsigned int start; | |
1550 | ||
1551 | bhptr = per_cpu_ptr(mib, cpu); | |
1552 | syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); | |
1553 | do { | |
1554 | start = u64_stats_fetch_begin_irq(syncp); | |
1555 | v = *(((u64 *)bhptr) + offt); | |
1556 | } while (u64_stats_fetch_retry_irq(syncp, start)); | |
1557 | ||
1558 | return v; | |
1559 | } | |
1560 | EXPORT_SYMBOL_GPL(snmp_get_cpu_field64); | |
1561 | ||
698365fa | 1562 | u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) |
4ce3c183 ED |
1563 | { |
1564 | u64 res = 0; | |
1565 | int cpu; | |
1566 | ||
1567 | for_each_possible_cpu(cpu) { | |
d1bfc625 | 1568 | res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); |
4ce3c183 ED |
1569 | } |
1570 | return res; | |
1571 | } | |
1572 | EXPORT_SYMBOL_GPL(snmp_fold_field64); | |
1573 | #endif | |
1574 | ||
1da177e4 | 1575 | #ifdef CONFIG_IP_MULTICAST |
32613090 | 1576 | static const struct net_protocol igmp_protocol = { |
1da177e4 | 1577 | .handler = igmp_rcv, |
b4ee07df | 1578 | .netns_ok = 1, |
1da177e4 LT |
1579 | }; |
1580 | #endif | |
1581 | ||
32613090 | 1582 | static const struct net_protocol tcp_protocol = { |
41063e9d DM |
1583 | .early_demux = tcp_v4_early_demux, |
1584 | .handler = tcp_v4_rcv, | |
1585 | .err_handler = tcp_v4_err, | |
41063e9d DM |
1586 | .no_policy = 1, |
1587 | .netns_ok = 1, | |
8ed1dc44 | 1588 | .icmp_strict_tag_validation = 1, |
1da177e4 LT |
1589 | }; |
1590 | ||
32613090 | 1591 | static const struct net_protocol udp_protocol = { |
421b3885 | 1592 | .early_demux = udp_v4_early_demux, |
1da177e4 LT |
1593 | .handler = udp_rcv, |
1594 | .err_handler = udp_err, | |
1595 | .no_policy = 1, | |
92f1fecb | 1596 | .netns_ok = 1, |
1da177e4 LT |
1597 | }; |
1598 | ||
32613090 | 1599 | static const struct net_protocol icmp_protocol = { |
1da177e4 | 1600 | .handler = icmp_rcv, |
5b052042 | 1601 | .err_handler = icmp_err, |
8b7817f3 | 1602 | .no_policy = 1, |
92f1fecb | 1603 | .netns_ok = 1, |
1da177e4 LT |
1604 | }; |
1605 | ||
9b4661bd PE |
1606 | static __net_init int ipv4_mib_init_net(struct net *net) |
1607 | { | |
827da44c JS |
1608 | int i; |
1609 | ||
698365fa WC |
1610 | net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); |
1611 | if (!net->mib.tcp_statistics) | |
57ef42d5 | 1612 | goto err_tcp_mib; |
698365fa WC |
1613 | net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); |
1614 | if (!net->mib.ip_statistics) | |
a20f5799 | 1615 | goto err_ip_mib; |
827da44c JS |
1616 | |
1617 | for_each_possible_cpu(i) { | |
1618 | struct ipstats_mib *af_inet_stats; | |
698365fa | 1619 | af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); |
827da44c | 1620 | u64_stats_init(&af_inet_stats->syncp); |
827da44c JS |
1621 | } |
1622 | ||
698365fa WC |
1623 | net->mib.net_statistics = alloc_percpu(struct linux_mib); |
1624 | if (!net->mib.net_statistics) | |
61a7e260 | 1625 | goto err_net_mib; |
698365fa WC |
1626 | net->mib.udp_statistics = alloc_percpu(struct udp_mib); |
1627 | if (!net->mib.udp_statistics) | |
2f275f91 | 1628 | goto err_udp_mib; |
698365fa WC |
1629 | net->mib.udplite_statistics = alloc_percpu(struct udp_mib); |
1630 | if (!net->mib.udplite_statistics) | |
386019d3 | 1631 | goto err_udplite_mib; |
698365fa WC |
1632 | net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); |
1633 | if (!net->mib.icmp_statistics) | |
b60538a0 | 1634 | goto err_icmp_mib; |
acb32ba3 ED |
1635 | net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), |
1636 | GFP_KERNEL); | |
1637 | if (!net->mib.icmpmsg_statistics) | |
923c6586 | 1638 | goto err_icmpmsg_mib; |
57ef42d5 PE |
1639 | |
1640 | tcp_mib_init(net); | |
9b4661bd | 1641 | return 0; |
57ef42d5 | 1642 | |
923c6586 | 1643 | err_icmpmsg_mib: |
698365fa | 1644 | free_percpu(net->mib.icmp_statistics); |
b60538a0 | 1645 | err_icmp_mib: |
698365fa | 1646 | free_percpu(net->mib.udplite_statistics); |
386019d3 | 1647 | err_udplite_mib: |
698365fa | 1648 | free_percpu(net->mib.udp_statistics); |
2f275f91 | 1649 | err_udp_mib: |
698365fa | 1650 | free_percpu(net->mib.net_statistics); |
61a7e260 | 1651 | err_net_mib: |
698365fa | 1652 | free_percpu(net->mib.ip_statistics); |
a20f5799 | 1653 | err_ip_mib: |
698365fa | 1654 | free_percpu(net->mib.tcp_statistics); |
57ef42d5 PE |
1655 | err_tcp_mib: |
1656 | return -ENOMEM; | |
9b4661bd PE |
1657 | } |
1658 | ||
1659 | static __net_exit void ipv4_mib_exit_net(struct net *net) | |
1660 | { | |
acb32ba3 | 1661 | kfree(net->mib.icmpmsg_statistics); |
698365fa WC |
1662 | free_percpu(net->mib.icmp_statistics); |
1663 | free_percpu(net->mib.udplite_statistics); | |
1664 | free_percpu(net->mib.udp_statistics); | |
1665 | free_percpu(net->mib.net_statistics); | |
1666 | free_percpu(net->mib.ip_statistics); | |
1667 | free_percpu(net->mib.tcp_statistics); | |
9b4661bd PE |
1668 | } |
1669 | ||
1670 | static __net_initdata struct pernet_operations ipv4_mib_ops = { | |
1671 | .init = ipv4_mib_init_net, | |
1672 | .exit = ipv4_mib_exit_net, | |
1673 | }; | |
1674 | ||
1da177e4 LT |
1675 | static int __init init_ipv4_mibs(void) |
1676 | { | |
d89cbbb1 | 1677 | return register_pernet_subsys(&ipv4_mib_ops); |
1da177e4 LT |
1678 | } |
1679 | ||
c9d8f1a6 CW |
1680 | static __net_init int inet_init_net(struct net *net) |
1681 | { | |
1682 | /* | |
1683 | * Set defaults for local port range | |
1684 | */ | |
1685 | seqlock_init(&net->ipv4.ip_local_ports.lock); | |
1686 | net->ipv4.ip_local_ports.range[0] = 32768; | |
07f4c900 | 1687 | net->ipv4.ip_local_ports.range[1] = 60999; |
ba6b918a CW |
1688 | |
1689 | seqlock_init(&net->ipv4.ping_group_range.lock); | |
1690 | /* | |
1691 | * Sane defaults - nobody may create ping sockets. | |
1692 | * Boot scripts should set this to distro-specific group. | |
1693 | */ | |
1694 | net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); | |
1695 | net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); | |
049bbf58 EG |
1696 | |
1697 | /* Default values for sysctl-controlled parameters. | |
1698 | * We set them here, in case sysctl is not compiled. | |
1699 | */ | |
1700 | net->ipv4.sysctl_ip_default_ttl = IPDEFTTL; | |
1701 | net->ipv4.sysctl_ip_dynaddr = 0; | |
1702 | net->ipv4.sysctl_ip_early_demux = 1; | |
1703 | ||
c9d8f1a6 CW |
1704 | return 0; |
1705 | } | |
1706 | ||
1707 | static __net_exit void inet_exit_net(struct net *net) | |
1708 | { | |
1709 | } | |
1710 | ||
1711 | static __net_initdata struct pernet_operations af_inet_ops = { | |
1712 | .init = inet_init_net, | |
1713 | .exit = inet_exit_net, | |
1714 | }; | |
1715 | ||
1716 | static int __init init_inet_pernet_ops(void) | |
1717 | { | |
1718 | return register_pernet_subsys(&af_inet_ops); | |
1719 | } | |
1720 | ||
1da177e4 | 1721 | static int ipv4_proc_init(void); |
1da177e4 | 1722 | |
30e224d7 HX |
1723 | /* |
1724 | * IP protocol layer initialiser | |
1725 | */ | |
1726 | ||
22061d80 VY |
1727 | static struct packet_offload ip_packet_offload __read_mostly = { |
1728 | .type = cpu_to_be16(ETH_P_IP), | |
f191a1d1 | 1729 | .callbacks = { |
f191a1d1 VY |
1730 | .gso_segment = inet_gso_segment, |
1731 | .gro_receive = inet_gro_receive, | |
1732 | .gro_complete = inet_gro_complete, | |
1733 | }, | |
30e224d7 HX |
1734 | }; |
1735 | ||
cb32f511 ED |
1736 | static const struct net_offload ipip_offload = { |
1737 | .callbacks = { | |
cb32f511 | 1738 | .gso_segment = inet_gso_segment, |
fac8e0f5 | 1739 | .gro_receive = ipip_gro_receive, |
b8cba75b | 1740 | .gro_complete = ipip_gro_complete, |
cb32f511 ED |
1741 | }, |
1742 | }; | |
1743 | ||
808a8f88 VY |
1744 | static int __init ipv4_offload_init(void) |
1745 | { | |
1746 | /* | |
1747 | * Add offloads | |
1748 | */ | |
da5bab07 | 1749 | if (udpv4_offload_init() < 0) |
808a8f88 | 1750 | pr_crit("%s: Cannot add UDP protocol offload\n", __func__); |
28850dc7 DB |
1751 | if (tcpv4_offload_init() < 0) |
1752 | pr_crit("%s: Cannot add TCP protocol offload\n", __func__); | |
808a8f88 VY |
1753 | |
1754 | dev_add_offload(&ip_packet_offload); | |
cb32f511 | 1755 | inet_add_offload(&ipip_offload, IPPROTO_IPIP); |
808a8f88 VY |
1756 | return 0; |
1757 | } | |
1758 | ||
1759 | fs_initcall(ipv4_offload_init); | |
1760 | ||
1761 | static struct packet_type ip_packet_type __read_mostly = { | |
1762 | .type = cpu_to_be16(ETH_P_IP), | |
1763 | .func = ip_rcv, | |
1764 | }; | |
1765 | ||
1da177e4 LT |
1766 | static int __init inet_init(void) |
1767 | { | |
1da177e4 LT |
1768 | struct inet_protosw *q; |
1769 | struct list_head *r; | |
1770 | int rc = -EINVAL; | |
1771 | ||
b4772ef8 | 1772 | sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); |
1da177e4 LT |
1773 | |
1774 | rc = proto_register(&tcp_prot, 1); | |
1775 | if (rc) | |
122ff243 | 1776 | goto out; |
1da177e4 LT |
1777 | |
1778 | rc = proto_register(&udp_prot, 1); | |
1779 | if (rc) | |
1780 | goto out_unregister_tcp_proto; | |
1781 | ||
1782 | rc = proto_register(&raw_prot, 1); | |
1783 | if (rc) | |
1784 | goto out_unregister_udp_proto; | |
1785 | ||
c319b4d7 VK |
1786 | rc = proto_register(&ping_prot, 1); |
1787 | if (rc) | |
1788 | goto out_unregister_raw_proto; | |
1789 | ||
1da177e4 | 1790 | /* |
e905a9ed | 1791 | * Tell SOCKET that we are alive... |
1da177e4 LT |
1792 | */ |
1793 | ||
e905a9ed | 1794 | (void)sock_register(&inet_family_ops); |
1da177e4 | 1795 | |
bd7b1533 AV |
1796 | #ifdef CONFIG_SYSCTL |
1797 | ip_static_sysctl_init(); | |
1798 | #endif | |
1799 | ||
1da177e4 LT |
1800 | /* |
1801 | * Add all the base protocols. | |
1802 | */ | |
1803 | ||
1804 | if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) | |
058bd4d2 | 1805 | pr_crit("%s: Cannot add ICMP protocol\n", __func__); |
1da177e4 | 1806 | if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) |
058bd4d2 | 1807 | pr_crit("%s: Cannot add UDP protocol\n", __func__); |
1da177e4 | 1808 | if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) |
058bd4d2 | 1809 | pr_crit("%s: Cannot add TCP protocol\n", __func__); |
1da177e4 LT |
1810 | #ifdef CONFIG_IP_MULTICAST |
1811 | if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) | |
058bd4d2 | 1812 | pr_crit("%s: Cannot add IGMP protocol\n", __func__); |
1da177e4 LT |
1813 | #endif |
1814 | ||
1815 | /* Register the socket-side information for inet_create. */ | |
1816 | for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) | |
1817 | INIT_LIST_HEAD(r); | |
1818 | ||
1819 | for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) | |
1820 | inet_register_protosw(q); | |
1821 | ||
1822 | /* | |
1823 | * Set the ARP module up | |
1824 | */ | |
1825 | ||
1826 | arp_init(); | |
1827 | ||
e905a9ed YH |
1828 | /* |
1829 | * Set the IP module up | |
1830 | */ | |
1da177e4 LT |
1831 | |
1832 | ip_init(); | |
1833 | ||
9b0f976f | 1834 | tcp_v4_init(); |
1da177e4 LT |
1835 | |
1836 | /* Setup TCP slab cache for open requests. */ | |
1837 | tcp_init(); | |
1838 | ||
95766fff HA |
1839 | /* Setup UDP memory threshold */ |
1840 | udp_init(); | |
1841 | ||
ba4e58ec GR |
1842 | /* Add UDP-Lite (RFC 3828) */ |
1843 | udplite4_register(); | |
1da177e4 | 1844 | |
c319b4d7 VK |
1845 | ping_init(); |
1846 | ||
1da177e4 LT |
1847 | /* |
1848 | * Set the ICMP layer up | |
1849 | */ | |
1850 | ||
a5710d65 DL |
1851 | if (icmp_init() < 0) |
1852 | panic("Failed to create the ICMP control socket.\n"); | |
1da177e4 LT |
1853 | |
1854 | /* | |
1855 | * Initialise the multicast router | |
1856 | */ | |
1857 | #if defined(CONFIG_IP_MROUTE) | |
03d2f897 | 1858 | if (ip_mr_init()) |
058bd4d2 | 1859 | pr_crit("%s: Cannot init ipv4 mroute\n", __func__); |
1da177e4 | 1860 | #endif |
c9d8f1a6 CW |
1861 | |
1862 | if (init_inet_pernet_ops()) | |
1863 | pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); | |
1da177e4 LT |
1864 | /* |
1865 | * Initialise per-cpu ipv4 mibs | |
e905a9ed | 1866 | */ |
1da177e4 | 1867 | |
132adf54 | 1868 | if (init_ipv4_mibs()) |
058bd4d2 | 1869 | pr_crit("%s: Cannot init ipv4 mibs\n", __func__); |
e905a9ed | 1870 | |
1da177e4 LT |
1871 | ipv4_proc_init(); |
1872 | ||
1873 | ipfrag_init(); | |
1874 | ||
30e224d7 HX |
1875 | dev_add_pack(&ip_packet_type); |
1876 | ||
045a0fa0 TG |
1877 | ip_tunnel_core_init(); |
1878 | ||
1da177e4 LT |
1879 | rc = 0; |
1880 | out: | |
1881 | return rc; | |
c319b4d7 VK |
1882 | out_unregister_raw_proto: |
1883 | proto_unregister(&raw_prot); | |
1da177e4 LT |
1884 | out_unregister_udp_proto: |
1885 | proto_unregister(&udp_prot); | |
321efff7 OK |
1886 | out_unregister_tcp_proto: |
1887 | proto_unregister(&tcp_prot); | |
1da177e4 LT |
1888 | goto out; |
1889 | } | |
1890 | ||
a536e077 | 1891 | fs_initcall(inet_init); |
1da177e4 LT |
1892 | |
1893 | /* ------------------------------------------------------------------------ */ | |
1894 | ||
1895 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
1896 | static int __init ipv4_proc_init(void) |
1897 | { | |
1898 | int rc = 0; | |
1899 | ||
1900 | if (raw_proc_init()) | |
1901 | goto out_raw; | |
1902 | if (tcp4_proc_init()) | |
1903 | goto out_tcp; | |
1904 | if (udp4_proc_init()) | |
1905 | goto out_udp; | |
c319b4d7 VK |
1906 | if (ping_proc_init()) |
1907 | goto out_ping; | |
1da177e4 LT |
1908 | if (ip_misc_proc_init()) |
1909 | goto out_misc; | |
1910 | out: | |
1911 | return rc; | |
1912 | out_misc: | |
c319b4d7 VK |
1913 | ping_proc_exit(); |
1914 | out_ping: | |
1da177e4 LT |
1915 | udp4_proc_exit(); |
1916 | out_udp: | |
1917 | tcp4_proc_exit(); | |
1918 | out_tcp: | |
1919 | raw_proc_exit(); | |
1920 | out_raw: | |
1921 | rc = -ENOMEM; | |
1922 | goto out; | |
1923 | } | |
1924 | ||
1925 | #else /* CONFIG_PROC_FS */ | |
1926 | static int __init ipv4_proc_init(void) | |
1927 | { | |
1928 | return 0; | |
1929 | } | |
1930 | #endif /* CONFIG_PROC_FS */ |