Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * Version: $Id: af_inet.c,v 1.137 2002/02/01 22:01:03 davem Exp $ |
| 9 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 10 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 12 | * Florian La Roche, <flla@stud.uni-sb.de> |
| 13 | * Alan Cox, <A.Cox@swansea.ac.uk> |
| 14 | * |
| 15 | * Changes (see also sock.c) |
| 16 | * |
| 17 | * piggy, |
| 18 | * Karl Knutson : Socket protocol table |
| 19 | * A.N.Kuznetsov : Socket death error in accept(). |
| 20 | * John Richardson : Fix non blocking error in connect() |
| 21 | * so sockets that fail to connect |
| 22 | * don't return -EINPROGRESS. |
| 23 | * Alan Cox : Asynchronous I/O support |
| 24 | * Alan Cox : Keep correct socket pointer on sock |
| 25 | * structures |
| 26 | * when accept() ed |
| 27 | * Alan Cox : Semantics of SO_LINGER aren't state |
| 28 | * moved to close when you look carefully. |
| 29 | * With this fixed and the accept bug fixed |
| 30 | * some RPC stuff seems happier. |
| 31 | * Niibe Yutaka : 4.4BSD style write async I/O |
| 32 | * Alan Cox, |
| 33 | * Tony Gale : Fixed reuse semantics. |
| 34 | * Alan Cox : bind() shouldn't abort existing but dead |
| 35 | * sockets. Stops FTP netin:.. I hope. |
| 36 | * Alan Cox : bind() works correctly for RAW sockets. |
| 37 | * Note that FreeBSD at least was broken |
| 38 | * in this respect so be careful with |
| 39 | * compatibility tests... |
| 40 | * Alan Cox : routing cache support |
| 41 | * Alan Cox : memzero the socket structure for |
| 42 | * compactness. |
| 43 | * Matt Day : nonblock connect error handler |
| 44 | * Alan Cox : Allow large numbers of pending sockets |
| 45 | * (eg for big web sites), but only if |
| 46 | * specifically application requested. |
| 47 | * Alan Cox : New buffering throughout IP. Used |
| 48 | * dumbly. |
| 49 | * Alan Cox : New buffering now used smartly. |
| 50 | * Alan Cox : BSD rather than common sense |
| 51 | * interpretation of listen. |
| 52 | * Germano Caronni : Assorted small races. |
| 53 | * Alan Cox : sendmsg/recvmsg basic support. |
| 54 | * Alan Cox : Only sendmsg/recvmsg now supported. |
| 55 | * Alan Cox : Locked down bind (see security list). |
| 56 | * Alan Cox : Loosened bind a little. |
| 57 | * Mike McLagan : ADD/DEL DLCI Ioctls |
| 58 | * Willy Konynenberg : Transparent proxying support. |
| 59 | * David S. Miller : New socket lookup architecture. |
| 60 | * Some other random speedups. |
| 61 | * Cyrus Durgin : Cleaned up file for kmod hacks. |
| 62 | * Andi Kleen : Fix inet_stream_connect TCP race. |
| 63 | * |
| 64 | * This program is free software; you can redistribute it and/or |
| 65 | * modify it under the terms of the GNU General Public License |
| 66 | * as published by the Free Software Foundation; either version |
| 67 | * 2 of the License, or (at your option) any later version. |
| 68 | */ |
| 69 | |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 70 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | #include <linux/module.h> |
| 77 | #include <linux/sched.h> |
| 78 | #include <linux/timer.h> |
| 79 | #include <linux/string.h> |
| 80 | #include <linux/sockios.h> |
| 81 | #include <linux/net.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 82 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
David S. Miller | b3da2cf | 2007-03-23 11:40:27 -0700 | [diff] [blame] | 90 | #include <linux/random.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
| 92 | #include <asm/uaccess.h> |
| 93 | #include <asm/system.h> |
| 94 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | #include <linux/inet.h> |
| 96 | #include <linux/igmp.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 97 | #include <linux/inetdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | #include <linux/netdevice.h> |
| 99 | #include <net/ip.h> |
| 100 | #include <net/protocol.h> |
| 101 | #include <net/arp.h> |
| 102 | #include <net/route.h> |
| 103 | #include <net/ip_fib.h> |
Arnaldo Carvalho de Melo | 295f732 | 2005-08-09 20:11:56 -0700 | [diff] [blame] | 104 | #include <net/inet_connection_sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | #include <net/tcp.h> |
| 106 | #include <net/udp.h> |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 107 | #include <net/udplite.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | #include <linux/skbuff.h> |
| 109 | #include <net/sock.h> |
| 110 | #include <net/raw.h> |
| 111 | #include <net/icmp.h> |
| 112 | #include <net/ipip.h> |
| 113 | #include <net/inet_common.h> |
| 114 | #include <net/xfrm.h> |
| 115 | #ifdef CONFIG_IP_MROUTE |
| 116 | #include <linux/mroute.h> |
| 117 | #endif |
| 118 | |
Eric Dumazet | ba89966 | 2005-08-26 12:05:31 -0700 | [diff] [blame] | 119 | DEFINE_SNMP_STAT(struct linux_mib, net_statistics) __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | extern void ip_mc_drop_socket(struct sock *sk); |
| 122 | |
| 123 | /* The inetsw table contains everything that inet_create needs to |
| 124 | * build a new socket. |
| 125 | */ |
| 126 | static struct list_head inetsw[SOCK_MAX]; |
| 127 | static DEFINE_SPINLOCK(inetsw_lock); |
| 128 | |
Pavel Emelyanov | 9ba6397 | 2007-12-05 01:38:23 -0800 | [diff] [blame] | 129 | struct ipv4_config ipv4_config; |
| 130 | |
| 131 | EXPORT_SYMBOL(ipv4_config); |
| 132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | /* New destruction routine */ |
| 134 | |
| 135 | void inet_sock_destruct(struct sock *sk) |
| 136 | { |
| 137 | struct inet_sock *inet = inet_sk(sk); |
| 138 | |
| 139 | __skb_queue_purge(&sk->sk_receive_queue); |
| 140 | __skb_queue_purge(&sk->sk_error_queue); |
| 141 | |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 142 | sk_mem_reclaim(sk); |
| 143 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { |
| 145 | printk("Attempt to release TCP socket in state %d %p\n", |
| 146 | sk->sk_state, sk); |
| 147 | return; |
| 148 | } |
| 149 | if (!sock_flag(sk, SOCK_DEAD)) { |
| 150 | printk("Attempt to release alive inet socket %p\n", sk); |
| 151 | return; |
| 152 | } |
| 153 | |
| 154 | BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); |
| 155 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); |
| 156 | BUG_TRAP(!sk->sk_wmem_queued); |
| 157 | BUG_TRAP(!sk->sk_forward_alloc); |
| 158 | |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 159 | kfree(inet->opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | dst_release(sk->sk_dst_cache); |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 161 | sk_refcnt_debug_dec(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | } |
| 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->num) { |
| 181 | if (sk->sk_prot->get_port(sk, 0)) { |
| 182 | release_sock(sk); |
| 183 | return -EAGAIN; |
| 184 | } |
| 185 | inet->sport = htons(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) { |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 214 | err = inet_csk_listen_start(sk, backlog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | if (err) |
| 216 | goto out; |
| 217 | } |
| 218 | sk->sk_max_ack_backlog = backlog; |
| 219 | err = 0; |
| 220 | |
| 221 | out: |
| 222 | release_sock(sk); |
| 223 | return err; |
| 224 | } |
| 225 | |
Eric Dumazet | be77628 | 2007-03-27 13:53:04 -0700 | [diff] [blame] | 226 | u32 inet_ehash_secret __read_mostly; |
David S. Miller | b3da2cf | 2007-03-23 11:40:27 -0700 | [diff] [blame] | 227 | EXPORT_SYMBOL(inet_ehash_secret); |
| 228 | |
Eric Dumazet | be77628 | 2007-03-27 13:53:04 -0700 | [diff] [blame] | 229 | /* |
| 230 | * inet_ehash_secret must be set exactly once |
| 231 | * Instead of using a dedicated spinlock, we (ab)use inetsw_lock |
| 232 | */ |
David S. Miller | b3da2cf | 2007-03-23 11:40:27 -0700 | [diff] [blame] | 233 | void build_ehash_secret(void) |
| 234 | { |
Eric Dumazet | be77628 | 2007-03-27 13:53:04 -0700 | [diff] [blame] | 235 | u32 rnd; |
| 236 | do { |
| 237 | get_random_bytes(&rnd, sizeof(rnd)); |
| 238 | } while (rnd == 0); |
| 239 | spin_lock_bh(&inetsw_lock); |
| 240 | if (!inet_ehash_secret) |
| 241 | inet_ehash_secret = rnd; |
| 242 | spin_unlock_bh(&inetsw_lock); |
David S. Miller | b3da2cf | 2007-03-23 11:40:27 -0700 | [diff] [blame] | 243 | } |
| 244 | EXPORT_SYMBOL(build_ehash_secret); |
| 245 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | /* |
| 247 | * Create an inet socket. |
| 248 | */ |
| 249 | |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 250 | static int inet_create(struct net *net, struct socket *sock, int protocol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | { |
| 252 | struct sock *sk; |
| 253 | struct list_head *p; |
| 254 | struct inet_protosw *answer; |
| 255 | struct inet_sock *inet; |
| 256 | struct proto *answer_prot; |
| 257 | unsigned char answer_flags; |
| 258 | char answer_no_check; |
Arnaldo Carvalho de Melo | bb97d31 | 2005-08-09 20:19:14 -0700 | [diff] [blame] | 259 | int try_loading_module = 0; |
Herbert Xu | 86c8f9d | 2005-12-02 20:43:26 -0800 | [diff] [blame] | 260 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 262 | if (net != &init_net) |
| 263 | return -EAFNOSUPPORT; |
| 264 | |
David S. Miller | b3da2cf | 2007-03-23 11:40:27 -0700 | [diff] [blame] | 265 | if (sock->type != SOCK_RAW && |
| 266 | sock->type != SOCK_DGRAM && |
| 267 | !inet_ehash_secret) |
| 268 | build_ehash_secret(); |
| 269 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | sock->state = SS_UNCONNECTED; |
| 271 | |
| 272 | /* Look for the requested type/protocol pair. */ |
| 273 | answer = NULL; |
Arnaldo Carvalho de Melo | bb97d31 | 2005-08-09 20:19:14 -0700 | [diff] [blame] | 274 | lookup_protocol: |
Herbert Xu | 86c8f9d | 2005-12-02 20:43:26 -0800 | [diff] [blame] | 275 | err = -ESOCKTNOSUPPORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | rcu_read_lock(); |
| 277 | list_for_each_rcu(p, &inetsw[sock->type]) { |
| 278 | answer = list_entry(p, struct inet_protosw, list); |
| 279 | |
| 280 | /* Check the non-wild match. */ |
| 281 | if (protocol == answer->protocol) { |
| 282 | if (protocol != IPPROTO_IP) |
| 283 | break; |
| 284 | } else { |
| 285 | /* Check for the two wild cases. */ |
| 286 | if (IPPROTO_IP == protocol) { |
| 287 | protocol = answer->protocol; |
| 288 | break; |
| 289 | } |
| 290 | if (IPPROTO_IP == answer->protocol) |
| 291 | break; |
| 292 | } |
Herbert Xu | 86c8f9d | 2005-12-02 20:43:26 -0800 | [diff] [blame] | 293 | err = -EPROTONOSUPPORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | answer = NULL; |
| 295 | } |
| 296 | |
Arnaldo Carvalho de Melo | bb97d31 | 2005-08-09 20:19:14 -0700 | [diff] [blame] | 297 | if (unlikely(answer == NULL)) { |
| 298 | if (try_loading_module < 2) { |
| 299 | rcu_read_unlock(); |
| 300 | /* |
| 301 | * Be more specific, e.g. net-pf-2-proto-132-type-1 |
| 302 | * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) |
| 303 | */ |
| 304 | if (++try_loading_module == 1) |
| 305 | request_module("net-pf-%d-proto-%d-type-%d", |
| 306 | PF_INET, protocol, sock->type); |
| 307 | /* |
| 308 | * Fall back to generic, e.g. net-pf-2-proto-132 |
| 309 | * (net-pf-PF_INET-proto-IPPROTO_SCTP) |
| 310 | */ |
| 311 | else |
| 312 | request_module("net-pf-%d-proto-%d", |
| 313 | PF_INET, protocol); |
| 314 | goto lookup_protocol; |
| 315 | } else |
| 316 | goto out_rcu_unlock; |
| 317 | } |
| 318 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | err = -EPERM; |
| 320 | if (answer->capability > 0 && !capable(answer->capability)) |
| 321 | goto out_rcu_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
| 323 | sock->ops = answer->ops; |
| 324 | answer_prot = answer->prot; |
| 325 | answer_no_check = answer->no_check; |
| 326 | answer_flags = answer->flags; |
| 327 | rcu_read_unlock(); |
| 328 | |
| 329 | BUG_TRAP(answer_prot->slab != NULL); |
| 330 | |
| 331 | err = -ENOBUFS; |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 332 | sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | if (sk == NULL) |
| 334 | goto out; |
| 335 | |
| 336 | err = 0; |
| 337 | sk->sk_no_check = answer_no_check; |
| 338 | if (INET_PROTOSW_REUSE & answer_flags) |
| 339 | sk->sk_reuse = 1; |
| 340 | |
| 341 | inet = inet_sk(sk); |
Paul Moore | 469de9b | 2007-01-09 14:37:06 -0800 | [diff] [blame] | 342 | inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | |
| 344 | if (SOCK_RAW == sock->type) { |
| 345 | inet->num = protocol; |
| 346 | if (IPPROTO_RAW == protocol) |
| 347 | inet->hdrincl = 1; |
| 348 | } |
| 349 | |
| 350 | if (ipv4_config.no_pmtu_disc) |
| 351 | inet->pmtudisc = IP_PMTUDISC_DONT; |
| 352 | else |
| 353 | inet->pmtudisc = IP_PMTUDISC_WANT; |
| 354 | |
| 355 | inet->id = 0; |
| 356 | |
| 357 | sock_init_data(sock, sk); |
| 358 | |
| 359 | sk->sk_destruct = inet_sock_destruct; |
| 360 | sk->sk_family = PF_INET; |
| 361 | sk->sk_protocol = protocol; |
| 362 | sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; |
| 363 | |
| 364 | inet->uc_ttl = -1; |
| 365 | inet->mc_loop = 1; |
| 366 | inet->mc_ttl = 1; |
| 367 | inet->mc_index = 0; |
| 368 | inet->mc_list = NULL; |
| 369 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 370 | sk_refcnt_debug_inc(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | |
| 372 | if (inet->num) { |
| 373 | /* It assumes that any protocol which allows |
| 374 | * the user to assign a number at socket |
| 375 | * creation time automatically |
| 376 | * shares. |
| 377 | */ |
| 378 | inet->sport = htons(inet->num); |
| 379 | /* Add to protocol hash chains. */ |
| 380 | sk->sk_prot->hash(sk); |
| 381 | } |
| 382 | |
| 383 | if (sk->sk_prot->init) { |
| 384 | err = sk->sk_prot->init(sk); |
| 385 | if (err) |
| 386 | sk_common_release(sk); |
| 387 | } |
| 388 | out: |
| 389 | return err; |
| 390 | out_rcu_unlock: |
| 391 | rcu_read_unlock(); |
| 392 | goto out; |
| 393 | } |
| 394 | |
| 395 | |
| 396 | /* |
| 397 | * The peer socket should always be NULL (or else). When we call this |
| 398 | * function we are destroying the object and from then on nobody |
| 399 | * should refer to it. |
| 400 | */ |
| 401 | int inet_release(struct socket *sock) |
| 402 | { |
| 403 | struct sock *sk = sock->sk; |
| 404 | |
| 405 | if (sk) { |
| 406 | long timeout; |
| 407 | |
| 408 | /* Applications forget to leave groups before exiting */ |
| 409 | ip_mc_drop_socket(sk); |
| 410 | |
| 411 | /* If linger is set, we don't return until the close |
| 412 | * is complete. Otherwise we return immediately. The |
| 413 | * actually closing is done the same either way. |
| 414 | * |
| 415 | * If the close is due to the process exiting, we never |
| 416 | * linger.. |
| 417 | */ |
| 418 | timeout = 0; |
| 419 | if (sock_flag(sk, SOCK_LINGER) && |
| 420 | !(current->flags & PF_EXITING)) |
| 421 | timeout = sk->sk_lingertime; |
| 422 | sock->sk = NULL; |
| 423 | sk->sk_prot->close(sk, timeout); |
| 424 | } |
| 425 | return 0; |
| 426 | } |
| 427 | |
| 428 | /* It is off by default, see below. */ |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 429 | int sysctl_ip_nonlocal_bind __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | unsigned short snum; |
| 437 | int chk_addr_ret; |
| 438 | int err; |
| 439 | |
| 440 | /* If the socket has its own bind function then use it. (RAW) */ |
| 441 | if (sk->sk_prot->bind) { |
| 442 | err = sk->sk_prot->bind(sk, uaddr, addr_len); |
| 443 | goto out; |
| 444 | } |
| 445 | err = -EINVAL; |
| 446 | if (addr_len < sizeof(struct sockaddr_in)) |
| 447 | goto out; |
| 448 | |
Eric W. Biederman | 6b175b2 | 2008-01-10 03:25:28 -0800 | [diff] [blame] | 449 | chk_addr_ret = inet_addr_type(&init_net, addr->sin_addr.s_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | |
| 451 | /* Not specified by any standard per-se, however it breaks too |
| 452 | * many applications when removed. It is unfortunate since |
| 453 | * allowing applications to make a non-local bind solves |
| 454 | * several problems with systems using dynamic addressing. |
| 455 | * (ie. your servers still start up even if your ISDN link |
| 456 | * is temporarily down) |
| 457 | */ |
| 458 | err = -EADDRNOTAVAIL; |
| 459 | if (!sysctl_ip_nonlocal_bind && |
| 460 | !inet->freebind && |
| 461 | addr->sin_addr.s_addr != INADDR_ANY && |
| 462 | chk_addr_ret != RTN_LOCAL && |
| 463 | chk_addr_ret != RTN_MULTICAST && |
| 464 | chk_addr_ret != RTN_BROADCAST) |
| 465 | goto out; |
| 466 | |
| 467 | snum = ntohs(addr->sin_port); |
| 468 | err = -EACCES; |
| 469 | if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) |
| 470 | goto out; |
| 471 | |
| 472 | /* We keep a pair of addresses. rcv_saddr is the one |
| 473 | * used by hash lookups, and saddr is used for transmit. |
| 474 | * |
| 475 | * In the BSD API these are the same except where it |
| 476 | * would be illegal to use them (multicast/broadcast) in |
| 477 | * which case the sending device address is used. |
| 478 | */ |
| 479 | lock_sock(sk); |
| 480 | |
| 481 | /* Check these errors (active socket, double bind). */ |
| 482 | err = -EINVAL; |
| 483 | if (sk->sk_state != TCP_CLOSE || inet->num) |
| 484 | goto out_release_sock; |
| 485 | |
| 486 | inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; |
| 487 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) |
| 488 | inet->saddr = 0; /* Use device */ |
| 489 | |
| 490 | /* Make sure we are allowed to bind here. */ |
| 491 | if (sk->sk_prot->get_port(sk, snum)) { |
| 492 | inet->saddr = inet->rcv_saddr = 0; |
| 493 | err = -EADDRINUSE; |
| 494 | goto out_release_sock; |
| 495 | } |
| 496 | |
| 497 | if (inet->rcv_saddr) |
| 498 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; |
| 499 | if (snum) |
| 500 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; |
| 501 | inet->sport = htons(inet->num); |
| 502 | inet->daddr = 0; |
| 503 | inet->dport = 0; |
| 504 | sk_dst_reset(sk); |
| 505 | err = 0; |
| 506 | out_release_sock: |
| 507 | release_sock(sk); |
| 508 | out: |
| 509 | return err; |
| 510 | } |
| 511 | |
| 512 | int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, |
| 513 | int addr_len, int flags) |
| 514 | { |
| 515 | struct sock *sk = sock->sk; |
| 516 | |
| 517 | if (uaddr->sa_family == AF_UNSPEC) |
| 518 | return sk->sk_prot->disconnect(sk, flags); |
| 519 | |
| 520 | if (!inet_sk(sk)->num && inet_autobind(sk)) |
| 521 | return -EAGAIN; |
| 522 | return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); |
| 523 | } |
| 524 | |
| 525 | static long inet_wait_for_connect(struct sock *sk, long timeo) |
| 526 | { |
| 527 | DEFINE_WAIT(wait); |
| 528 | |
| 529 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 530 | |
| 531 | /* Basic assumption: if someone sets sk->sk_err, he _must_ |
| 532 | * change state of the socket from TCP_SYN_*. |
| 533 | * Connect() does not allow to get error notifications |
| 534 | * without closing the socket. |
| 535 | */ |
| 536 | while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { |
| 537 | release_sock(sk); |
| 538 | timeo = schedule_timeout(timeo); |
| 539 | lock_sock(sk); |
| 540 | if (signal_pending(current) || !timeo) |
| 541 | break; |
| 542 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 543 | } |
| 544 | finish_wait(sk->sk_sleep, &wait); |
| 545 | return timeo; |
| 546 | } |
| 547 | |
| 548 | /* |
| 549 | * Connect to a remote host. There is regrettably still a little |
| 550 | * TCP 'magic' in here. |
| 551 | */ |
| 552 | int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, |
| 553 | int addr_len, int flags) |
| 554 | { |
| 555 | struct sock *sk = sock->sk; |
| 556 | int err; |
| 557 | long timeo; |
| 558 | |
| 559 | lock_sock(sk); |
| 560 | |
| 561 | if (uaddr->sa_family == AF_UNSPEC) { |
| 562 | err = sk->sk_prot->disconnect(sk, flags); |
| 563 | sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; |
| 564 | goto out; |
| 565 | } |
| 566 | |
| 567 | switch (sock->state) { |
| 568 | default: |
| 569 | err = -EINVAL; |
| 570 | goto out; |
| 571 | case SS_CONNECTED: |
| 572 | err = -EISCONN; |
| 573 | goto out; |
| 574 | case SS_CONNECTING: |
| 575 | err = -EALREADY; |
| 576 | /* Fall out of switch with err, set for this state */ |
| 577 | break; |
| 578 | case SS_UNCONNECTED: |
| 579 | err = -EISCONN; |
| 580 | if (sk->sk_state != TCP_CLOSE) |
| 581 | goto out; |
| 582 | |
| 583 | err = sk->sk_prot->connect(sk, uaddr, addr_len); |
| 584 | if (err < 0) |
| 585 | goto out; |
| 586 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 587 | sock->state = SS_CONNECTING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | |
| 589 | /* Just entered SS_CONNECTING state; the only |
| 590 | * difference is that return value in non-blocking |
| 591 | * case is EINPROGRESS, rather than EALREADY. |
| 592 | */ |
| 593 | err = -EINPROGRESS; |
| 594 | break; |
| 595 | } |
| 596 | |
| 597 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
| 598 | |
| 599 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { |
| 600 | /* Error code is set above */ |
| 601 | if (!timeo || !inet_wait_for_connect(sk, timeo)) |
| 602 | goto out; |
| 603 | |
| 604 | err = sock_intr_errno(timeo); |
| 605 | if (signal_pending(current)) |
| 606 | goto out; |
| 607 | } |
| 608 | |
| 609 | /* Connection was closed by RST, timeout, ICMP error |
| 610 | * or another process disconnected us. |
| 611 | */ |
| 612 | if (sk->sk_state == TCP_CLOSE) |
| 613 | goto sock_error; |
| 614 | |
| 615 | /* sk->sk_err may be not zero now, if RECVERR was ordered by user |
| 616 | * and error was received after socket entered established state. |
| 617 | * Hence, it is handled normally after connect() return successfully. |
| 618 | */ |
| 619 | |
| 620 | sock->state = SS_CONNECTED; |
| 621 | err = 0; |
| 622 | out: |
| 623 | release_sock(sk); |
| 624 | return err; |
| 625 | |
| 626 | sock_error: |
| 627 | err = sock_error(sk) ? : -ECONNABORTED; |
| 628 | sock->state = SS_UNCONNECTED; |
| 629 | if (sk->sk_prot->disconnect(sk, flags)) |
| 630 | sock->state = SS_DISCONNECTING; |
| 631 | goto out; |
| 632 | } |
| 633 | |
| 634 | /* |
| 635 | * Accept a pending connection. The TCP layer now gives BSD semantics. |
| 636 | */ |
| 637 | |
| 638 | int inet_accept(struct socket *sock, struct socket *newsock, int flags) |
| 639 | { |
| 640 | struct sock *sk1 = sock->sk; |
| 641 | int err = -EINVAL; |
| 642 | struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); |
| 643 | |
| 644 | if (!sk2) |
| 645 | goto do_err; |
| 646 | |
| 647 | lock_sock(sk2); |
| 648 | |
| 649 | BUG_TRAP((1 << sk2->sk_state) & |
| 650 | (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)); |
| 651 | |
| 652 | sock_graft(sk2, newsock); |
| 653 | |
| 654 | newsock->state = SS_CONNECTED; |
| 655 | err = 0; |
| 656 | release_sock(sk2); |
| 657 | do_err: |
| 658 | return err; |
| 659 | } |
| 660 | |
| 661 | |
| 662 | /* |
| 663 | * This does both peername and sockname. |
| 664 | */ |
| 665 | int inet_getname(struct socket *sock, struct sockaddr *uaddr, |
| 666 | int *uaddr_len, int peer) |
| 667 | { |
| 668 | struct sock *sk = sock->sk; |
| 669 | struct inet_sock *inet = inet_sk(sk); |
| 670 | struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; |
| 671 | |
| 672 | sin->sin_family = AF_INET; |
| 673 | if (peer) { |
| 674 | if (!inet->dport || |
| 675 | (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && |
| 676 | peer == 1)) |
| 677 | return -ENOTCONN; |
| 678 | sin->sin_port = inet->dport; |
| 679 | sin->sin_addr.s_addr = inet->daddr; |
| 680 | } else { |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 681 | __be32 addr = inet->rcv_saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | if (!addr) |
| 683 | addr = inet->saddr; |
| 684 | sin->sin_port = inet->sport; |
| 685 | sin->sin_addr.s_addr = addr; |
| 686 | } |
| 687 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); |
| 688 | *uaddr_len = sizeof(*sin); |
| 689 | return 0; |
| 690 | } |
| 691 | |
| 692 | int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, |
| 693 | size_t size) |
| 694 | { |
| 695 | struct sock *sk = sock->sk; |
| 696 | |
| 697 | /* We may need to bind the socket. */ |
| 698 | if (!inet_sk(sk)->num && inet_autobind(sk)) |
| 699 | return -EAGAIN; |
| 700 | |
| 701 | return sk->sk_prot->sendmsg(iocb, sk, msg, size); |
| 702 | } |
| 703 | |
| 704 | |
| 705 | static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) |
| 706 | { |
| 707 | struct sock *sk = sock->sk; |
| 708 | |
| 709 | /* We may need to bind the socket. */ |
| 710 | if (!inet_sk(sk)->num && inet_autobind(sk)) |
| 711 | return -EAGAIN; |
| 712 | |
| 713 | if (sk->sk_prot->sendpage) |
| 714 | return sk->sk_prot->sendpage(sk, page, offset, size, flags); |
| 715 | return sock_no_sendpage(sock, page, offset, size, flags); |
| 716 | } |
| 717 | |
| 718 | |
| 719 | int inet_shutdown(struct socket *sock, int how) |
| 720 | { |
| 721 | struct sock *sk = sock->sk; |
| 722 | int err = 0; |
| 723 | |
| 724 | /* This should really check to make sure |
| 725 | * the socket is a TCP socket. (WHY AC...) |
| 726 | */ |
| 727 | how++; /* maps 0->1 has the advantage of making bit 1 rcvs and |
| 728 | 1->2 bit 2 snds. |
| 729 | 2->3 */ |
| 730 | if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ |
| 731 | return -EINVAL; |
| 732 | |
| 733 | lock_sock(sk); |
| 734 | if (sock->state == SS_CONNECTING) { |
| 735 | if ((1 << sk->sk_state) & |
| 736 | (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) |
| 737 | sock->state = SS_DISCONNECTING; |
| 738 | else |
| 739 | sock->state = SS_CONNECTED; |
| 740 | } |
| 741 | |
| 742 | switch (sk->sk_state) { |
| 743 | case TCP_CLOSE: |
| 744 | err = -ENOTCONN; |
| 745 | /* Hack to wake up other listeners, who can poll for |
| 746 | POLLHUP, even on eg. unconnected UDP sockets -- RR */ |
| 747 | default: |
| 748 | sk->sk_shutdown |= how; |
| 749 | if (sk->sk_prot->shutdown) |
| 750 | sk->sk_prot->shutdown(sk, how); |
| 751 | break; |
| 752 | |
| 753 | /* Remaining two branches are temporary solution for missing |
| 754 | * close() in multithreaded environment. It is _not_ a good idea, |
| 755 | * but we have no choice until close() is repaired at VFS level. |
| 756 | */ |
| 757 | case TCP_LISTEN: |
| 758 | if (!(how & RCV_SHUTDOWN)) |
| 759 | break; |
| 760 | /* Fall through */ |
| 761 | case TCP_SYN_SENT: |
| 762 | err = sk->sk_prot->disconnect(sk, O_NONBLOCK); |
| 763 | sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; |
| 764 | break; |
| 765 | } |
| 766 | |
| 767 | /* Wake up anyone sleeping in poll. */ |
| 768 | sk->sk_state_change(sk); |
| 769 | release_sock(sk); |
| 770 | return err; |
| 771 | } |
| 772 | |
| 773 | /* |
| 774 | * ioctl() calls you can issue on an INET socket. Most of these are |
| 775 | * device configuration and stuff and very rarely used. Some ioctls |
| 776 | * pass on to the socket itself. |
| 777 | * |
| 778 | * NOTE: I like the idea of a module for the config stuff. ie ifconfig |
| 779 | * loads the devconfigure module does its configuring and unloads it. |
| 780 | * There's a good 20K of config code hanging around the kernel. |
| 781 | */ |
| 782 | |
| 783 | int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| 784 | { |
| 785 | struct sock *sk = sock->sk; |
| 786 | int err = 0; |
Denis V. Lunev | e5b13cb | 2008-02-28 20:51:43 -0800 | [diff] [blame] | 787 | struct net *net = sk->sk_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | |
| 789 | switch (cmd) { |
| 790 | case SIOCGSTAMP: |
| 791 | err = sock_get_timestamp(sk, (struct timeval __user *)arg); |
| 792 | break; |
Eric Dumazet | ae40eb1 | 2007-03-18 17:33:16 -0700 | [diff] [blame] | 793 | case SIOCGSTAMPNS: |
| 794 | err = sock_get_timestampns(sk, (struct timespec __user *)arg); |
| 795 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | case SIOCADDRT: |
| 797 | case SIOCDELRT: |
| 798 | case SIOCRTMSG: |
Denis V. Lunev | e5b13cb | 2008-02-28 20:51:43 -0800 | [diff] [blame] | 799 | err = ip_rt_ioctl(net, cmd, (void __user *)arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | break; |
| 801 | case SIOCDARP: |
| 802 | case SIOCGARP: |
| 803 | case SIOCSARP: |
Denis V. Lunev | e5b13cb | 2008-02-28 20:51:43 -0800 | [diff] [blame] | 804 | err = arp_ioctl(net, cmd, (void __user *)arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | break; |
| 806 | case SIOCGIFADDR: |
| 807 | case SIOCSIFADDR: |
| 808 | case SIOCGIFBRDADDR: |
| 809 | case SIOCSIFBRDADDR: |
| 810 | case SIOCGIFNETMASK: |
| 811 | case SIOCSIFNETMASK: |
| 812 | case SIOCGIFDSTADDR: |
| 813 | case SIOCSIFDSTADDR: |
| 814 | case SIOCSIFPFLAGS: |
| 815 | case SIOCGIFPFLAGS: |
| 816 | case SIOCSIFFLAGS: |
Denis V. Lunev | e5b13cb | 2008-02-28 20:51:43 -0800 | [diff] [blame] | 817 | err = devinet_ioctl(net, cmd, (void __user *)arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | break; |
| 819 | default: |
Christoph Hellwig | b5e5fa5 | 2006-01-03 14:18:33 -0800 | [diff] [blame] | 820 | if (sk->sk_prot->ioctl) |
| 821 | err = sk->sk_prot->ioctl(sk, cmd, arg); |
| 822 | else |
| 823 | err = -ENOIOCTLCMD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | break; |
| 825 | } |
| 826 | return err; |
| 827 | } |
| 828 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 829 | const struct proto_ops inet_stream_ops = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 830 | .family = PF_INET, |
| 831 | .owner = THIS_MODULE, |
| 832 | .release = inet_release, |
| 833 | .bind = inet_bind, |
| 834 | .connect = inet_stream_connect, |
| 835 | .socketpair = sock_no_socketpair, |
| 836 | .accept = inet_accept, |
| 837 | .getname = inet_getname, |
| 838 | .poll = tcp_poll, |
| 839 | .ioctl = inet_ioctl, |
| 840 | .listen = inet_listen, |
| 841 | .shutdown = inet_shutdown, |
| 842 | .setsockopt = sock_common_setsockopt, |
| 843 | .getsockopt = sock_common_getsockopt, |
David S. Miller | 3516ffb | 2007-08-02 19:23:56 -0700 | [diff] [blame] | 844 | .sendmsg = tcp_sendmsg, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 845 | .recvmsg = sock_common_recvmsg, |
| 846 | .mmap = sock_no_mmap, |
| 847 | .sendpage = tcp_sendpage, |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 848 | .splice_read = tcp_splice_read, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 849 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 850 | .compat_setsockopt = compat_sock_common_setsockopt, |
| 851 | .compat_getsockopt = compat_sock_common_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 852 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | }; |
| 854 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 855 | const struct proto_ops inet_dgram_ops = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 856 | .family = PF_INET, |
| 857 | .owner = THIS_MODULE, |
| 858 | .release = inet_release, |
| 859 | .bind = inet_bind, |
| 860 | .connect = inet_dgram_connect, |
| 861 | .socketpair = sock_no_socketpair, |
| 862 | .accept = sock_no_accept, |
| 863 | .getname = inet_getname, |
| 864 | .poll = udp_poll, |
| 865 | .ioctl = inet_ioctl, |
| 866 | .listen = sock_no_listen, |
| 867 | .shutdown = inet_shutdown, |
| 868 | .setsockopt = sock_common_setsockopt, |
| 869 | .getsockopt = sock_common_getsockopt, |
| 870 | .sendmsg = inet_sendmsg, |
| 871 | .recvmsg = sock_common_recvmsg, |
| 872 | .mmap = sock_no_mmap, |
| 873 | .sendpage = inet_sendpage, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 874 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 875 | .compat_setsockopt = compat_sock_common_setsockopt, |
| 876 | .compat_getsockopt = compat_sock_common_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 877 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | }; |
| 879 | |
| 880 | /* |
| 881 | * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without |
| 882 | * udp_poll |
| 883 | */ |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 884 | static const struct proto_ops inet_sockraw_ops = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 885 | .family = PF_INET, |
| 886 | .owner = THIS_MODULE, |
| 887 | .release = inet_release, |
| 888 | .bind = inet_bind, |
| 889 | .connect = inet_dgram_connect, |
| 890 | .socketpair = sock_no_socketpair, |
| 891 | .accept = sock_no_accept, |
| 892 | .getname = inet_getname, |
| 893 | .poll = datagram_poll, |
| 894 | .ioctl = inet_ioctl, |
| 895 | .listen = sock_no_listen, |
| 896 | .shutdown = inet_shutdown, |
| 897 | .setsockopt = sock_common_setsockopt, |
| 898 | .getsockopt = sock_common_getsockopt, |
| 899 | .sendmsg = inet_sendmsg, |
| 900 | .recvmsg = sock_common_recvmsg, |
| 901 | .mmap = sock_no_mmap, |
| 902 | .sendpage = inet_sendpage, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 903 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 904 | .compat_setsockopt = compat_sock_common_setsockopt, |
| 905 | .compat_getsockopt = compat_sock_common_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 906 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | }; |
| 908 | |
| 909 | static struct net_proto_family inet_family_ops = { |
| 910 | .family = PF_INET, |
| 911 | .create = inet_create, |
| 912 | .owner = THIS_MODULE, |
| 913 | }; |
| 914 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | /* Upon startup we insert all the elements in inetsw_array[] into |
| 916 | * the linked list inetsw. |
| 917 | */ |
| 918 | static struct inet_protosw inetsw_array[] = |
| 919 | { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 920 | { |
| 921 | .type = SOCK_STREAM, |
| 922 | .protocol = IPPROTO_TCP, |
| 923 | .prot = &tcp_prot, |
| 924 | .ops = &inet_stream_ops, |
| 925 | .capability = -1, |
| 926 | .no_check = 0, |
| 927 | .flags = INET_PROTOSW_PERMANENT | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 928 | INET_PROTOSW_ICSK, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 929 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 931 | { |
| 932 | .type = SOCK_DGRAM, |
| 933 | .protocol = IPPROTO_UDP, |
| 934 | .prot = &udp_prot, |
| 935 | .ops = &inet_dgram_ops, |
| 936 | .capability = -1, |
| 937 | .no_check = UDP_CSUM_DEFAULT, |
| 938 | .flags = INET_PROTOSW_PERMANENT, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | }, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 940 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | |
| 942 | { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 943 | .type = SOCK_RAW, |
| 944 | .protocol = IPPROTO_IP, /* wild card */ |
| 945 | .prot = &raw_prot, |
| 946 | .ops = &inet_sockraw_ops, |
| 947 | .capability = CAP_NET_RAW, |
| 948 | .no_check = UDP_CSUM_DEFAULT, |
| 949 | .flags = INET_PROTOSW_REUSE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | } |
| 951 | }; |
| 952 | |
Denis Cheng | c40f6ff | 2007-09-16 16:39:25 -0700 | [diff] [blame] | 953 | #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | |
| 955 | void inet_register_protosw(struct inet_protosw *p) |
| 956 | { |
| 957 | struct list_head *lh; |
| 958 | struct inet_protosw *answer; |
| 959 | int protocol = p->protocol; |
| 960 | struct list_head *last_perm; |
| 961 | |
| 962 | spin_lock_bh(&inetsw_lock); |
| 963 | |
| 964 | if (p->type >= SOCK_MAX) |
| 965 | goto out_illegal; |
| 966 | |
| 967 | /* If we are trying to override a permanent protocol, bail. */ |
| 968 | answer = NULL; |
| 969 | last_perm = &inetsw[p->type]; |
| 970 | list_for_each(lh, &inetsw[p->type]) { |
| 971 | answer = list_entry(lh, struct inet_protosw, list); |
| 972 | |
| 973 | /* Check only the non-wild match. */ |
| 974 | if (INET_PROTOSW_PERMANENT & answer->flags) { |
| 975 | if (protocol == answer->protocol) |
| 976 | break; |
| 977 | last_perm = lh; |
| 978 | } |
| 979 | |
| 980 | answer = NULL; |
| 981 | } |
| 982 | if (answer) |
| 983 | goto out_permanent; |
| 984 | |
| 985 | /* Add the new entry after the last permanent entry if any, so that |
| 986 | * the new entry does not override a permanent entry when matched with |
| 987 | * a wild-card protocol. But it is allowed to override any existing |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 988 | * non-permanent entry. This means that when we remove this entry, the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | * system automatically returns to the old behavior. |
| 990 | */ |
| 991 | list_add_rcu(&p->list, last_perm); |
| 992 | out: |
| 993 | spin_unlock_bh(&inetsw_lock); |
| 994 | |
| 995 | synchronize_net(); |
| 996 | |
| 997 | return; |
| 998 | |
| 999 | out_permanent: |
| 1000 | printk(KERN_ERR "Attempt to override permanent protocol %d.\n", |
| 1001 | protocol); |
| 1002 | goto out; |
| 1003 | |
| 1004 | out_illegal: |
| 1005 | printk(KERN_ERR |
| 1006 | "Ignoring attempt to register invalid socket type %d.\n", |
| 1007 | p->type); |
| 1008 | goto out; |
| 1009 | } |
| 1010 | |
| 1011 | void inet_unregister_protosw(struct inet_protosw *p) |
| 1012 | { |
| 1013 | if (INET_PROTOSW_PERMANENT & p->flags) { |
| 1014 | printk(KERN_ERR |
| 1015 | "Attempt to unregister permanent protocol %d.\n", |
| 1016 | p->protocol); |
| 1017 | } else { |
| 1018 | spin_lock_bh(&inetsw_lock); |
| 1019 | list_del_rcu(&p->list); |
| 1020 | spin_unlock_bh(&inetsw_lock); |
| 1021 | |
| 1022 | synchronize_net(); |
| 1023 | } |
| 1024 | } |
| 1025 | |
Arnaldo Carvalho de Melo | 32519f1 | 2005-08-09 19:50:02 -0700 | [diff] [blame] | 1026 | /* |
| 1027 | * Shall we try to damage output packets if routing dev changes? |
| 1028 | */ |
| 1029 | |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 1030 | int sysctl_ip_dynaddr __read_mostly; |
Arnaldo Carvalho de Melo | 32519f1 | 2005-08-09 19:50:02 -0700 | [diff] [blame] | 1031 | |
| 1032 | static int inet_sk_reselect_saddr(struct sock *sk) |
| 1033 | { |
| 1034 | struct inet_sock *inet = inet_sk(sk); |
| 1035 | int err; |
| 1036 | struct rtable *rt; |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 1037 | __be32 old_saddr = inet->saddr; |
| 1038 | __be32 new_saddr; |
Al Viro | bada8ad | 2006-09-26 21:27:15 -0700 | [diff] [blame] | 1039 | __be32 daddr = inet->daddr; |
Arnaldo Carvalho de Melo | 32519f1 | 2005-08-09 19:50:02 -0700 | [diff] [blame] | 1040 | |
| 1041 | if (inet->opt && inet->opt->srr) |
| 1042 | daddr = inet->opt->faddr; |
| 1043 | |
| 1044 | /* Query new route. */ |
| 1045 | err = ip_route_connect(&rt, daddr, 0, |
| 1046 | RT_CONN_FLAGS(sk), |
| 1047 | sk->sk_bound_dev_if, |
| 1048 | sk->sk_protocol, |
David S. Miller | 8eb9086 | 2007-02-08 02:09:21 -0800 | [diff] [blame] | 1049 | inet->sport, inet->dport, sk, 0); |
Arnaldo Carvalho de Melo | 32519f1 | 2005-08-09 19:50:02 -0700 | [diff] [blame] | 1050 | if (err) |
| 1051 | return err; |
| 1052 | |
| 1053 | sk_setup_caps(sk, &rt->u.dst); |
| 1054 | |
| 1055 | new_saddr = rt->rt_src; |
| 1056 | |
| 1057 | if (new_saddr == old_saddr) |
| 1058 | return 0; |
| 1059 | |
| 1060 | if (sysctl_ip_dynaddr > 1) { |
| 1061 | printk(KERN_INFO "%s(): shifting inet->" |
| 1062 | "saddr from %d.%d.%d.%d to %d.%d.%d.%d\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1063 | __func__, |
Arnaldo Carvalho de Melo | 32519f1 | 2005-08-09 19:50:02 -0700 | [diff] [blame] | 1064 | NIPQUAD(old_saddr), |
| 1065 | NIPQUAD(new_saddr)); |
| 1066 | } |
| 1067 | |
| 1068 | inet->saddr = inet->rcv_saddr = new_saddr; |
| 1069 | |
| 1070 | /* |
| 1071 | * XXX The only one ugly spot where we need to |
| 1072 | * XXX really change the sockets identity after |
| 1073 | * XXX it has entered the hashes. -DaveM |
| 1074 | * |
| 1075 | * Besides that, it does not check for connection |
| 1076 | * uniqueness. Wait for troubles. |
| 1077 | */ |
| 1078 | __sk_prot_rehash(sk); |
| 1079 | return 0; |
| 1080 | } |
| 1081 | |
| 1082 | int inet_sk_rebuild_header(struct sock *sk) |
| 1083 | { |
| 1084 | struct inet_sock *inet = inet_sk(sk); |
| 1085 | struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); |
Al Viro | 3ca3c68 | 2006-09-27 18:28:07 -0700 | [diff] [blame] | 1086 | __be32 daddr; |
Arnaldo Carvalho de Melo | 32519f1 | 2005-08-09 19:50:02 -0700 | [diff] [blame] | 1087 | int err; |
| 1088 | |
| 1089 | /* Route is OK, nothing to do. */ |
| 1090 | if (rt) |
| 1091 | return 0; |
| 1092 | |
| 1093 | /* Reroute. */ |
| 1094 | daddr = inet->daddr; |
| 1095 | if (inet->opt && inet->opt->srr) |
| 1096 | daddr = inet->opt->faddr; |
| 1097 | { |
| 1098 | struct flowi fl = { |
| 1099 | .oif = sk->sk_bound_dev_if, |
| 1100 | .nl_u = { |
| 1101 | .ip4_u = { |
| 1102 | .daddr = daddr, |
| 1103 | .saddr = inet->saddr, |
| 1104 | .tos = RT_CONN_FLAGS(sk), |
| 1105 | }, |
| 1106 | }, |
| 1107 | .proto = sk->sk_protocol, |
| 1108 | .uli_u = { |
| 1109 | .ports = { |
| 1110 | .sport = inet->sport, |
| 1111 | .dport = inet->dport, |
| 1112 | }, |
| 1113 | }, |
| 1114 | }; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1115 | |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 1116 | security_sk_classify_flow(sk, &fl); |
Denis V. Lunev | f1b050b | 2008-01-22 22:07:10 -0800 | [diff] [blame] | 1117 | err = ip_route_output_flow(&init_net, &rt, &fl, sk, 0); |
Arnaldo Carvalho de Melo | 32519f1 | 2005-08-09 19:50:02 -0700 | [diff] [blame] | 1118 | } |
| 1119 | if (!err) |
| 1120 | sk_setup_caps(sk, &rt->u.dst); |
| 1121 | else { |
| 1122 | /* Routing failed... */ |
| 1123 | sk->sk_route_caps = 0; |
| 1124 | /* |
| 1125 | * Other protocols have to map its equivalent state to TCP_SYN_SENT. |
| 1126 | * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme |
| 1127 | */ |
| 1128 | if (!sysctl_ip_dynaddr || |
| 1129 | sk->sk_state != TCP_SYN_SENT || |
| 1130 | (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || |
| 1131 | (err = inet_sk_reselect_saddr(sk)) != 0) |
| 1132 | sk->sk_err_soft = -err; |
| 1133 | } |
| 1134 | |
| 1135 | return err; |
| 1136 | } |
| 1137 | |
| 1138 | EXPORT_SYMBOL(inet_sk_rebuild_header); |
| 1139 | |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1140 | static int inet_gso_send_check(struct sk_buff *skb) |
| 1141 | { |
| 1142 | struct iphdr *iph; |
| 1143 | struct net_protocol *ops; |
| 1144 | int proto; |
| 1145 | int ihl; |
| 1146 | int err = -EINVAL; |
| 1147 | |
| 1148 | if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) |
| 1149 | goto out; |
| 1150 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1151 | iph = ip_hdr(skb); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1152 | ihl = iph->ihl * 4; |
| 1153 | if (ihl < sizeof(*iph)) |
| 1154 | goto out; |
| 1155 | |
| 1156 | if (unlikely(!pskb_may_pull(skb, ihl))) |
| 1157 | goto out; |
| 1158 | |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 1159 | __skb_pull(skb, ihl); |
| 1160 | skb_reset_transport_header(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1161 | iph = ip_hdr(skb); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1162 | proto = iph->protocol & (MAX_INET_PROTOS - 1); |
| 1163 | err = -EPROTONOSUPPORT; |
| 1164 | |
| 1165 | rcu_read_lock(); |
| 1166 | ops = rcu_dereference(inet_protos[proto]); |
| 1167 | if (likely(ops && ops->gso_send_check)) |
| 1168 | err = ops->gso_send_check(skb); |
| 1169 | rcu_read_unlock(); |
| 1170 | |
| 1171 | out: |
| 1172 | return err; |
| 1173 | } |
| 1174 | |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1175 | static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features) |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 1176 | { |
| 1177 | struct sk_buff *segs = ERR_PTR(-EINVAL); |
| 1178 | struct iphdr *iph; |
| 1179 | struct net_protocol *ops; |
| 1180 | int proto; |
| 1181 | int ihl; |
| 1182 | int id; |
| 1183 | |
Stephen Hemminger | d212f87 | 2007-06-27 00:47:37 -0700 | [diff] [blame] | 1184 | if (!(features & NETIF_F_V4_CSUM)) |
| 1185 | features &= ~NETIF_F_SG; |
| 1186 | |
Herbert Xu | bbcf467 | 2006-07-03 19:38:35 -0700 | [diff] [blame] | 1187 | if (unlikely(skb_shinfo(skb)->gso_type & |
| 1188 | ~(SKB_GSO_TCPV4 | |
| 1189 | SKB_GSO_UDP | |
| 1190 | SKB_GSO_DODGY | |
| 1191 | SKB_GSO_TCP_ECN | |
| 1192 | 0))) |
| 1193 | goto out; |
| 1194 | |
| 1195 | if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 1196 | goto out; |
| 1197 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1198 | iph = ip_hdr(skb); |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 1199 | ihl = iph->ihl * 4; |
| 1200 | if (ihl < sizeof(*iph)) |
| 1201 | goto out; |
| 1202 | |
Herbert Xu | bbcf467 | 2006-07-03 19:38:35 -0700 | [diff] [blame] | 1203 | if (unlikely(!pskb_may_pull(skb, ihl))) |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 1204 | goto out; |
| 1205 | |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 1206 | __skb_pull(skb, ihl); |
| 1207 | skb_reset_transport_header(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1208 | iph = ip_hdr(skb); |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 1209 | id = ntohs(iph->id); |
| 1210 | proto = iph->protocol & (MAX_INET_PROTOS - 1); |
| 1211 | segs = ERR_PTR(-EPROTONOSUPPORT); |
| 1212 | |
| 1213 | rcu_read_lock(); |
| 1214 | ops = rcu_dereference(inet_protos[proto]); |
Herbert Xu | bbcf467 | 2006-07-03 19:38:35 -0700 | [diff] [blame] | 1215 | if (likely(ops && ops->gso_segment)) |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1216 | segs = ops->gso_segment(skb, features); |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 1217 | rcu_read_unlock(); |
| 1218 | |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1219 | if (!segs || unlikely(IS_ERR(segs))) |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 1220 | goto out; |
| 1221 | |
| 1222 | skb = segs; |
| 1223 | do { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1224 | iph = ip_hdr(skb); |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 1225 | iph->id = htons(id++); |
| 1226 | iph->tot_len = htons(skb->len - skb->mac_len); |
| 1227 | iph->check = 0; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 1228 | iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 1229 | } while ((skb = skb->next)); |
| 1230 | |
| 1231 | out: |
| 1232 | return segs; |
| 1233 | } |
| 1234 | |
Herbert Xu | 5e0f043 | 2007-04-24 21:53:35 -0700 | [diff] [blame] | 1235 | unsigned long snmp_fold_field(void *mib[], int offt) |
| 1236 | { |
| 1237 | unsigned long res = 0; |
| 1238 | int i; |
| 1239 | |
| 1240 | for_each_possible_cpu(i) { |
| 1241 | res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt); |
| 1242 | res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt); |
| 1243 | } |
| 1244 | return res; |
| 1245 | } |
| 1246 | EXPORT_SYMBOL_GPL(snmp_fold_field); |
| 1247 | |
YOSHIFUJI Hideaki | c69bce2 | 2008-01-23 22:31:45 -0800 | [diff] [blame] | 1248 | int snmp_mib_init(void *ptr[2], size_t mibsize) |
Herbert Xu | 5e0f043 | 2007-04-24 21:53:35 -0700 | [diff] [blame] | 1249 | { |
| 1250 | BUG_ON(ptr == NULL); |
| 1251 | ptr[0] = __alloc_percpu(mibsize); |
| 1252 | if (!ptr[0]) |
| 1253 | goto err0; |
| 1254 | ptr[1] = __alloc_percpu(mibsize); |
| 1255 | if (!ptr[1]) |
| 1256 | goto err1; |
| 1257 | return 0; |
| 1258 | err1: |
| 1259 | free_percpu(ptr[0]); |
| 1260 | ptr[0] = NULL; |
| 1261 | err0: |
| 1262 | return -ENOMEM; |
| 1263 | } |
| 1264 | EXPORT_SYMBOL_GPL(snmp_mib_init); |
| 1265 | |
| 1266 | void snmp_mib_free(void *ptr[2]) |
| 1267 | { |
| 1268 | BUG_ON(ptr == NULL); |
| 1269 | free_percpu(ptr[0]); |
| 1270 | free_percpu(ptr[1]); |
| 1271 | ptr[0] = ptr[1] = NULL; |
| 1272 | } |
| 1273 | EXPORT_SYMBOL_GPL(snmp_mib_free); |
| 1274 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | #ifdef CONFIG_IP_MULTICAST |
| 1276 | static struct net_protocol igmp_protocol = { |
| 1277 | .handler = igmp_rcv, |
| 1278 | }; |
| 1279 | #endif |
| 1280 | |
| 1281 | static struct net_protocol tcp_protocol = { |
| 1282 | .handler = tcp_v4_rcv, |
| 1283 | .err_handler = tcp_v4_err, |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1284 | .gso_send_check = tcp_v4_gso_send_check, |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 1285 | .gso_segment = tcp_tso_segment, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | .no_policy = 1, |
| 1287 | }; |
| 1288 | |
| 1289 | static struct net_protocol udp_protocol = { |
| 1290 | .handler = udp_rcv, |
| 1291 | .err_handler = udp_err, |
| 1292 | .no_policy = 1, |
| 1293 | }; |
| 1294 | |
| 1295 | static struct net_protocol icmp_protocol = { |
| 1296 | .handler = icmp_rcv, |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 1297 | .no_policy = 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | }; |
| 1299 | |
| 1300 | static int __init init_ipv4_mibs(void) |
| 1301 | { |
YOSHIFUJI Hideaki | 3349017 | 2007-04-20 15:57:15 -0700 | [diff] [blame] | 1302 | if (snmp_mib_init((void **)net_statistics, |
YOSHIFUJI Hideaki | c69bce2 | 2008-01-23 22:31:45 -0800 | [diff] [blame] | 1303 | sizeof(struct linux_mib)) < 0) |
YOSHIFUJI Hideaki | 3349017 | 2007-04-20 15:57:15 -0700 | [diff] [blame] | 1304 | goto err_net_mib; |
| 1305 | if (snmp_mib_init((void **)ip_statistics, |
YOSHIFUJI Hideaki | c69bce2 | 2008-01-23 22:31:45 -0800 | [diff] [blame] | 1306 | sizeof(struct ipstats_mib)) < 0) |
YOSHIFUJI Hideaki | 3349017 | 2007-04-20 15:57:15 -0700 | [diff] [blame] | 1307 | goto err_ip_mib; |
| 1308 | if (snmp_mib_init((void **)icmp_statistics, |
YOSHIFUJI Hideaki | c69bce2 | 2008-01-23 22:31:45 -0800 | [diff] [blame] | 1309 | sizeof(struct icmp_mib)) < 0) |
YOSHIFUJI Hideaki | 3349017 | 2007-04-20 15:57:15 -0700 | [diff] [blame] | 1310 | goto err_icmp_mib; |
David L Stevens | 96793b4 | 2007-09-17 09:57:33 -0700 | [diff] [blame] | 1311 | if (snmp_mib_init((void **)icmpmsg_statistics, |
YOSHIFUJI Hideaki | c69bce2 | 2008-01-23 22:31:45 -0800 | [diff] [blame] | 1312 | sizeof(struct icmpmsg_mib)) < 0) |
David L Stevens | 96793b4 | 2007-09-17 09:57:33 -0700 | [diff] [blame] | 1313 | goto err_icmpmsg_mib; |
YOSHIFUJI Hideaki | 3349017 | 2007-04-20 15:57:15 -0700 | [diff] [blame] | 1314 | if (snmp_mib_init((void **)tcp_statistics, |
YOSHIFUJI Hideaki | c69bce2 | 2008-01-23 22:31:45 -0800 | [diff] [blame] | 1315 | sizeof(struct tcp_mib)) < 0) |
YOSHIFUJI Hideaki | 3349017 | 2007-04-20 15:57:15 -0700 | [diff] [blame] | 1316 | goto err_tcp_mib; |
| 1317 | if (snmp_mib_init((void **)udp_statistics, |
YOSHIFUJI Hideaki | c69bce2 | 2008-01-23 22:31:45 -0800 | [diff] [blame] | 1318 | sizeof(struct udp_mib)) < 0) |
YOSHIFUJI Hideaki | 3349017 | 2007-04-20 15:57:15 -0700 | [diff] [blame] | 1319 | goto err_udp_mib; |
| 1320 | if (snmp_mib_init((void **)udplite_statistics, |
YOSHIFUJI Hideaki | c69bce2 | 2008-01-23 22:31:45 -0800 | [diff] [blame] | 1321 | sizeof(struct udp_mib)) < 0) |
YOSHIFUJI Hideaki | 3349017 | 2007-04-20 15:57:15 -0700 | [diff] [blame] | 1322 | goto err_udplite_mib; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame^] | 1323 | |
YOSHIFUJI Hideaki | 3349017 | 2007-04-20 15:57:15 -0700 | [diff] [blame] | 1324 | tcp_mib_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | |
| 1326 | return 0; |
YOSHIFUJI Hideaki | 3349017 | 2007-04-20 15:57:15 -0700 | [diff] [blame] | 1327 | |
| 1328 | err_udplite_mib: |
| 1329 | snmp_mib_free((void **)udp_statistics); |
| 1330 | err_udp_mib: |
| 1331 | snmp_mib_free((void **)tcp_statistics); |
| 1332 | err_tcp_mib: |
David L Stevens | 96793b4 | 2007-09-17 09:57:33 -0700 | [diff] [blame] | 1333 | snmp_mib_free((void **)icmpmsg_statistics); |
| 1334 | err_icmpmsg_mib: |
YOSHIFUJI Hideaki | 3349017 | 2007-04-20 15:57:15 -0700 | [diff] [blame] | 1335 | snmp_mib_free((void **)icmp_statistics); |
| 1336 | err_icmp_mib: |
| 1337 | snmp_mib_free((void **)ip_statistics); |
| 1338 | err_ip_mib: |
| 1339 | snmp_mib_free((void **)net_statistics); |
| 1340 | err_net_mib: |
| 1341 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | } |
| 1343 | |
| 1344 | static int ipv4_proc_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | |
Herbert Xu | 30e224d | 2005-07-05 14:40:10 -0700 | [diff] [blame] | 1346 | /* |
| 1347 | * IP protocol layer initialiser |
| 1348 | */ |
| 1349 | |
| 1350 | static struct packet_type ip_packet_type = { |
| 1351 | .type = __constant_htons(ETH_P_IP), |
| 1352 | .func = ip_rcv, |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 1353 | .gso_send_check = inet_gso_send_check, |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 1354 | .gso_segment = inet_gso_segment, |
Herbert Xu | 30e224d | 2005-07-05 14:40:10 -0700 | [diff] [blame] | 1355 | }; |
| 1356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | static int __init inet_init(void) |
| 1358 | { |
| 1359 | struct sk_buff *dummy_skb; |
| 1360 | struct inet_protosw *q; |
| 1361 | struct list_head *r; |
| 1362 | int rc = -EINVAL; |
| 1363 | |
YOSHIFUJI Hideaki | ef047f5 | 2006-09-01 00:29:06 -0700 | [diff] [blame] | 1364 | BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | |
| 1366 | rc = proto_register(&tcp_prot, 1); |
| 1367 | if (rc) |
| 1368 | goto out; |
| 1369 | |
| 1370 | rc = proto_register(&udp_prot, 1); |
| 1371 | if (rc) |
| 1372 | goto out_unregister_tcp_proto; |
| 1373 | |
| 1374 | rc = proto_register(&raw_prot, 1); |
| 1375 | if (rc) |
| 1376 | goto out_unregister_udp_proto; |
| 1377 | |
| 1378 | /* |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1379 | * Tell SOCKET that we are alive... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | */ |
| 1381 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1382 | (void)sock_register(&inet_family_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | |
| 1384 | /* |
| 1385 | * Add all the base protocols. |
| 1386 | */ |
| 1387 | |
| 1388 | if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) |
| 1389 | printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); |
| 1390 | if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) |
| 1391 | printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); |
| 1392 | if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) |
| 1393 | printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); |
| 1394 | #ifdef CONFIG_IP_MULTICAST |
| 1395 | if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) |
| 1396 | printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); |
| 1397 | #endif |
| 1398 | |
| 1399 | /* Register the socket-side information for inet_create. */ |
| 1400 | for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) |
| 1401 | INIT_LIST_HEAD(r); |
| 1402 | |
| 1403 | for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) |
| 1404 | inet_register_protosw(q); |
| 1405 | |
| 1406 | /* |
| 1407 | * Set the ARP module up |
| 1408 | */ |
| 1409 | |
| 1410 | arp_init(); |
| 1411 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1412 | /* |
| 1413 | * Set the IP module up |
| 1414 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | |
| 1416 | ip_init(); |
| 1417 | |
Denis V. Lunev | 9b0f976 | 2008-02-29 11:13:15 -0800 | [diff] [blame] | 1418 | tcp_v4_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | |
| 1420 | /* Setup TCP slab cache for open requests. */ |
| 1421 | tcp_init(); |
| 1422 | |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 1423 | /* Setup UDP memory threshold */ |
| 1424 | udp_init(); |
| 1425 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1426 | /* Add UDP-Lite (RFC 3828) */ |
| 1427 | udplite4_register(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | |
| 1429 | /* |
| 1430 | * Set the ICMP layer up |
| 1431 | */ |
| 1432 | |
Denis V. Lunev | a5710d6 | 2008-02-29 11:14:50 -0800 | [diff] [blame] | 1433 | if (icmp_init() < 0) |
| 1434 | panic("Failed to create the ICMP control socket.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | |
| 1436 | /* |
| 1437 | * Initialise the multicast router |
| 1438 | */ |
| 1439 | #if defined(CONFIG_IP_MROUTE) |
| 1440 | ip_mr_init(); |
| 1441 | #endif |
| 1442 | /* |
| 1443 | * Initialise per-cpu ipv4 mibs |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1444 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | |
Stephen Hemminger | 132adf5 | 2007-03-08 20:44:43 -0800 | [diff] [blame] | 1446 | if (init_ipv4_mibs()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1448 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | ipv4_proc_init(); |
| 1450 | |
| 1451 | ipfrag_init(); |
| 1452 | |
Herbert Xu | 30e224d | 2005-07-05 14:40:10 -0700 | [diff] [blame] | 1453 | dev_add_pack(&ip_packet_type); |
| 1454 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | rc = 0; |
| 1456 | out: |
| 1457 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | out_unregister_udp_proto: |
| 1459 | proto_unregister(&udp_prot); |
Olaf Kirch | 321efff | 2006-09-27 16:33:45 -0700 | [diff] [blame] | 1460 | out_unregister_tcp_proto: |
| 1461 | proto_unregister(&tcp_prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | goto out; |
| 1463 | } |
| 1464 | |
Heiko Carstens | a536e07 | 2006-04-28 15:19:17 -0700 | [diff] [blame] | 1465 | fs_initcall(inet_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | |
| 1467 | /* ------------------------------------------------------------------------ */ |
| 1468 | |
| 1469 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | static int __init ipv4_proc_init(void) |
| 1471 | { |
| 1472 | int rc = 0; |
| 1473 | |
| 1474 | if (raw_proc_init()) |
| 1475 | goto out_raw; |
| 1476 | if (tcp4_proc_init()) |
| 1477 | goto out_tcp; |
| 1478 | if (udp4_proc_init()) |
| 1479 | goto out_udp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | if (ip_misc_proc_init()) |
| 1481 | goto out_misc; |
| 1482 | out: |
| 1483 | return rc; |
| 1484 | out_misc: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | udp4_proc_exit(); |
| 1486 | out_udp: |
| 1487 | tcp4_proc_exit(); |
| 1488 | out_tcp: |
| 1489 | raw_proc_exit(); |
| 1490 | out_raw: |
| 1491 | rc = -ENOMEM; |
| 1492 | goto out; |
| 1493 | } |
| 1494 | |
| 1495 | #else /* CONFIG_PROC_FS */ |
| 1496 | static int __init ipv4_proc_init(void) |
| 1497 | { |
| 1498 | return 0; |
| 1499 | } |
| 1500 | #endif /* CONFIG_PROC_FS */ |
| 1501 | |
| 1502 | MODULE_ALIAS_NETPROTO(PF_INET); |
| 1503 | |
| 1504 | EXPORT_SYMBOL(inet_accept); |
| 1505 | EXPORT_SYMBOL(inet_bind); |
| 1506 | EXPORT_SYMBOL(inet_dgram_connect); |
| 1507 | EXPORT_SYMBOL(inet_dgram_ops); |
| 1508 | EXPORT_SYMBOL(inet_getname); |
| 1509 | EXPORT_SYMBOL(inet_ioctl); |
| 1510 | EXPORT_SYMBOL(inet_listen); |
| 1511 | EXPORT_SYMBOL(inet_register_protosw); |
| 1512 | EXPORT_SYMBOL(inet_release); |
| 1513 | EXPORT_SYMBOL(inet_sendmsg); |
| 1514 | EXPORT_SYMBOL(inet_shutdown); |
| 1515 | EXPORT_SYMBOL(inet_sock_destruct); |
| 1516 | EXPORT_SYMBOL(inet_stream_connect); |
| 1517 | EXPORT_SYMBOL(inet_stream_ops); |
| 1518 | EXPORT_SYMBOL(inet_unregister_protosw); |
| 1519 | EXPORT_SYMBOL(net_statistics); |
Neil Horman | cdac4e0 | 2005-06-13 15:12:33 -0700 | [diff] [blame] | 1520 | EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); |