Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* SCTP kernel reference Implementation |
| 2 | * (C) Copyright IBM Corp. 2001, 2004 |
| 3 | * Copyright (c) 1999-2000 Cisco, Inc. |
| 4 | * Copyright (c) 1999-2001 Motorola, Inc. |
| 5 | * Copyright (c) 2001 Intel Corp. |
| 6 | * Copyright (c) 2001 Nokia, Inc. |
| 7 | * Copyright (c) 2001 La Monte H.P. Yarroll |
| 8 | * |
| 9 | * This file is part of the SCTP kernel reference Implementation |
| 10 | * |
| 11 | * Initialization/cleanup for SCTP protocol support. |
| 12 | * |
| 13 | * The SCTP reference implementation is free software; |
| 14 | * you can redistribute it and/or modify it under the terms of |
| 15 | * the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2, or (at your option) |
| 17 | * any later version. |
| 18 | * |
| 19 | * The SCTP reference implementation is distributed in the hope that it |
| 20 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| 21 | * ************************ |
| 22 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 23 | * See the GNU General Public License for more details. |
| 24 | * |
| 25 | * You should have received a copy of the GNU General Public License |
| 26 | * along with GNU CC; see the file COPYING. If not, write to |
| 27 | * the Free Software Foundation, 59 Temple Place - Suite 330, |
| 28 | * Boston, MA 02111-1307, USA. |
| 29 | * |
| 30 | * Please send any bug reports or fixes you make to the |
| 31 | * email address(es): |
| 32 | * lksctp developers <lksctp-developers@lists.sourceforge.net> |
| 33 | * |
| 34 | * Or submit a bug report through the following website: |
| 35 | * http://www.sf.net/projects/lksctp |
| 36 | * |
| 37 | * Written or modified by: |
| 38 | * La Monte H.P. Yarroll <piggy@acm.org> |
| 39 | * Karl Knutson <karl@athena.chicago.il.us> |
| 40 | * Jon Grimm <jgrimm@us.ibm.com> |
| 41 | * Sridhar Samudrala <sri@us.ibm.com> |
| 42 | * Daisy Chang <daisyc@us.ibm.com> |
| 43 | * Ardelle Fan <ardelle.fan@intel.com> |
| 44 | * |
| 45 | * Any bugs reported given to us we will try to fix... any fixes shared will |
| 46 | * be incorporated into the next SCTP release. |
| 47 | */ |
| 48 | |
| 49 | #include <linux/module.h> |
| 50 | #include <linux/init.h> |
| 51 | #include <linux/netdevice.h> |
| 52 | #include <linux/inetdevice.h> |
| 53 | #include <linux/seq_file.h> |
| 54 | #include <net/protocol.h> |
| 55 | #include <net/ip.h> |
| 56 | #include <net/ipv6.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 57 | #include <net/route.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | #include <net/sctp/sctp.h> |
| 59 | #include <net/addrconf.h> |
| 60 | #include <net/inet_common.h> |
| 61 | #include <net/inet_ecn.h> |
| 62 | |
| 63 | /* Global data structures. */ |
| 64 | struct sctp_globals sctp_globals; |
| 65 | struct proc_dir_entry *proc_net_sctp; |
Eric Dumazet | ba89966 | 2005-08-26 12:05:31 -0700 | [diff] [blame] | 66 | DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
| 68 | struct idr sctp_assocs_id; |
| 69 | DEFINE_SPINLOCK(sctp_assocs_id_lock); |
| 70 | |
| 71 | /* This is the global socket data structure used for responding to |
| 72 | * the Out-of-the-blue (OOTB) packets. A control sock will be created |
| 73 | * for this socket at the initialization time. |
| 74 | */ |
| 75 | static struct socket *sctp_ctl_socket; |
| 76 | |
| 77 | static struct sctp_pf *sctp_pf_inet6_specific; |
| 78 | static struct sctp_pf *sctp_pf_inet_specific; |
| 79 | static struct sctp_af *sctp_af_v4_specific; |
| 80 | static struct sctp_af *sctp_af_v6_specific; |
| 81 | |
Eric Dumazet | ba89966 | 2005-08-26 12:05:31 -0700 | [diff] [blame] | 82 | kmem_cache_t *sctp_chunk_cachep __read_mostly; |
| 83 | kmem_cache_t *sctp_bucket_cachep __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
| 85 | extern int sctp_snmp_proc_init(void); |
| 86 | extern int sctp_snmp_proc_exit(void); |
| 87 | extern int sctp_eps_proc_init(void); |
| 88 | extern int sctp_eps_proc_exit(void); |
| 89 | extern int sctp_assocs_proc_init(void); |
| 90 | extern int sctp_assocs_proc_exit(void); |
| 91 | |
| 92 | /* Return the address of the control sock. */ |
| 93 | struct sock *sctp_get_ctl_sock(void) |
| 94 | { |
| 95 | return sctp_ctl_socket->sk; |
| 96 | } |
| 97 | |
| 98 | /* Set up the proc fs entry for the SCTP protocol. */ |
| 99 | static __init int sctp_proc_init(void) |
| 100 | { |
| 101 | if (!proc_net_sctp) { |
| 102 | struct proc_dir_entry *ent; |
| 103 | ent = proc_mkdir("net/sctp", NULL); |
| 104 | if (ent) { |
| 105 | ent->owner = THIS_MODULE; |
| 106 | proc_net_sctp = ent; |
| 107 | } else |
| 108 | goto out_nomem; |
| 109 | } |
| 110 | |
| 111 | if (sctp_snmp_proc_init()) |
| 112 | goto out_nomem; |
| 113 | if (sctp_eps_proc_init()) |
| 114 | goto out_nomem; |
| 115 | if (sctp_assocs_proc_init()) |
| 116 | goto out_nomem; |
| 117 | |
| 118 | return 0; |
| 119 | |
| 120 | out_nomem: |
| 121 | return -ENOMEM; |
| 122 | } |
| 123 | |
| 124 | /* Clean up the proc fs entry for the SCTP protocol. |
| 125 | * Note: Do not make this __exit as it is used in the init error |
| 126 | * path. |
| 127 | */ |
| 128 | static void sctp_proc_exit(void) |
| 129 | { |
| 130 | sctp_snmp_proc_exit(); |
| 131 | sctp_eps_proc_exit(); |
| 132 | sctp_assocs_proc_exit(); |
| 133 | |
| 134 | if (proc_net_sctp) { |
| 135 | proc_net_sctp = NULL; |
| 136 | remove_proc_entry("net/sctp", NULL); |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | /* Private helper to extract ipv4 address and stash them in |
| 141 | * the protocol structure. |
| 142 | */ |
| 143 | static void sctp_v4_copy_addrlist(struct list_head *addrlist, |
| 144 | struct net_device *dev) |
| 145 | { |
| 146 | struct in_device *in_dev; |
| 147 | struct in_ifaddr *ifa; |
| 148 | struct sctp_sockaddr_entry *addr; |
| 149 | |
| 150 | rcu_read_lock(); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 151 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | rcu_read_unlock(); |
| 153 | return; |
| 154 | } |
| 155 | |
| 156 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
| 157 | /* Add the address to the local list. */ |
| 158 | addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); |
| 159 | if (addr) { |
| 160 | addr->a.v4.sin_family = AF_INET; |
| 161 | addr->a.v4.sin_port = 0; |
| 162 | addr->a.v4.sin_addr.s_addr = ifa->ifa_local; |
| 163 | list_add_tail(&addr->list, addrlist); |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | rcu_read_unlock(); |
| 168 | } |
| 169 | |
| 170 | /* Extract our IP addresses from the system and stash them in the |
| 171 | * protocol structure. |
| 172 | */ |
| 173 | static void __sctp_get_local_addr_list(void) |
| 174 | { |
| 175 | struct net_device *dev; |
| 176 | struct list_head *pos; |
| 177 | struct sctp_af *af; |
| 178 | |
| 179 | read_lock(&dev_base_lock); |
| 180 | for (dev = dev_base; dev; dev = dev->next) { |
| 181 | __list_for_each(pos, &sctp_address_families) { |
| 182 | af = list_entry(pos, struct sctp_af, list); |
| 183 | af->copy_addrlist(&sctp_local_addr_list, dev); |
| 184 | } |
| 185 | } |
| 186 | read_unlock(&dev_base_lock); |
| 187 | } |
| 188 | |
| 189 | static void sctp_get_local_addr_list(void) |
| 190 | { |
| 191 | unsigned long flags; |
| 192 | |
| 193 | sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags); |
| 194 | __sctp_get_local_addr_list(); |
| 195 | sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags); |
| 196 | } |
| 197 | |
| 198 | /* Free the existing local addresses. */ |
| 199 | static void __sctp_free_local_addr_list(void) |
| 200 | { |
| 201 | struct sctp_sockaddr_entry *addr; |
| 202 | struct list_head *pos, *temp; |
| 203 | |
| 204 | list_for_each_safe(pos, temp, &sctp_local_addr_list) { |
| 205 | addr = list_entry(pos, struct sctp_sockaddr_entry, list); |
| 206 | list_del(pos); |
| 207 | kfree(addr); |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | /* Free the existing local addresses. */ |
| 212 | static void sctp_free_local_addr_list(void) |
| 213 | { |
| 214 | unsigned long flags; |
| 215 | |
| 216 | sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags); |
| 217 | __sctp_free_local_addr_list(); |
| 218 | sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags); |
| 219 | } |
| 220 | |
| 221 | /* Copy the local addresses which are valid for 'scope' into 'bp'. */ |
| 222 | int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 223 | gfp_t gfp, int copy_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | { |
| 225 | struct sctp_sockaddr_entry *addr; |
| 226 | int error = 0; |
| 227 | struct list_head *pos; |
| 228 | unsigned long flags; |
| 229 | |
| 230 | sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags); |
| 231 | list_for_each(pos, &sctp_local_addr_list) { |
| 232 | addr = list_entry(pos, struct sctp_sockaddr_entry, list); |
| 233 | if (sctp_in_scope(&addr->a, scope)) { |
| 234 | /* Now that the address is in scope, check to see if |
| 235 | * the address type is really supported by the local |
| 236 | * sock as well as the remote peer. |
| 237 | */ |
| 238 | if ((((AF_INET == addr->a.sa.sa_family) && |
| 239 | (copy_flags & SCTP_ADDR4_PEERSUPP))) || |
| 240 | (((AF_INET6 == addr->a.sa.sa_family) && |
| 241 | (copy_flags & SCTP_ADDR6_ALLOWED) && |
| 242 | (copy_flags & SCTP_ADDR6_PEERSUPP)))) { |
| 243 | error = sctp_add_bind_addr(bp, &addr->a, |
| 244 | GFP_ATOMIC); |
| 245 | if (error) |
| 246 | goto end_copy; |
| 247 | } |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | end_copy: |
| 252 | sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags); |
| 253 | return error; |
| 254 | } |
| 255 | |
| 256 | /* Initialize a sctp_addr from in incoming skb. */ |
| 257 | static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, |
| 258 | int is_saddr) |
| 259 | { |
| 260 | void *from; |
| 261 | __u16 *port; |
| 262 | struct sctphdr *sh; |
| 263 | |
| 264 | port = &addr->v4.sin_port; |
| 265 | addr->v4.sin_family = AF_INET; |
| 266 | |
| 267 | sh = (struct sctphdr *) skb->h.raw; |
| 268 | if (is_saddr) { |
| 269 | *port = ntohs(sh->source); |
| 270 | from = &skb->nh.iph->saddr; |
| 271 | } else { |
| 272 | *port = ntohs(sh->dest); |
| 273 | from = &skb->nh.iph->daddr; |
| 274 | } |
| 275 | memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); |
| 276 | } |
| 277 | |
| 278 | /* Initialize an sctp_addr from a socket. */ |
| 279 | static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) |
| 280 | { |
| 281 | addr->v4.sin_family = AF_INET; |
| 282 | addr->v4.sin_port = inet_sk(sk)->num; |
| 283 | addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr; |
| 284 | } |
| 285 | |
| 286 | /* Initialize sk->sk_rcv_saddr from sctp_addr. */ |
| 287 | static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) |
| 288 | { |
| 289 | inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr; |
| 290 | } |
| 291 | |
| 292 | /* Initialize sk->sk_daddr from sctp_addr. */ |
| 293 | static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) |
| 294 | { |
| 295 | inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr; |
| 296 | } |
| 297 | |
| 298 | /* Initialize a sctp_addr from an address parameter. */ |
| 299 | static void sctp_v4_from_addr_param(union sctp_addr *addr, |
| 300 | union sctp_addr_param *param, |
| 301 | __u16 port, int iif) |
| 302 | { |
| 303 | addr->v4.sin_family = AF_INET; |
| 304 | addr->v4.sin_port = port; |
| 305 | addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; |
| 306 | } |
| 307 | |
| 308 | /* Initialize an address parameter from a sctp_addr and return the length |
| 309 | * of the address parameter. |
| 310 | */ |
| 311 | static int sctp_v4_to_addr_param(const union sctp_addr *addr, |
| 312 | union sctp_addr_param *param) |
| 313 | { |
| 314 | int length = sizeof(sctp_ipv4addr_param_t); |
| 315 | |
| 316 | param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; |
| 317 | param->v4.param_hdr.length = ntohs(length); |
| 318 | param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; |
| 319 | |
| 320 | return length; |
| 321 | } |
| 322 | |
| 323 | /* Initialize a sctp_addr from a dst_entry. */ |
| 324 | static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst, |
| 325 | unsigned short port) |
| 326 | { |
| 327 | struct rtable *rt = (struct rtable *)dst; |
| 328 | saddr->v4.sin_family = AF_INET; |
| 329 | saddr->v4.sin_port = port; |
| 330 | saddr->v4.sin_addr.s_addr = rt->rt_src; |
| 331 | } |
| 332 | |
| 333 | /* Compare two addresses exactly. */ |
| 334 | static int sctp_v4_cmp_addr(const union sctp_addr *addr1, |
| 335 | const union sctp_addr *addr2) |
| 336 | { |
| 337 | if (addr1->sa.sa_family != addr2->sa.sa_family) |
| 338 | return 0; |
| 339 | if (addr1->v4.sin_port != addr2->v4.sin_port) |
| 340 | return 0; |
| 341 | if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) |
| 342 | return 0; |
| 343 | |
| 344 | return 1; |
| 345 | } |
| 346 | |
| 347 | /* Initialize addr struct to INADDR_ANY. */ |
| 348 | static void sctp_v4_inaddr_any(union sctp_addr *addr, unsigned short port) |
| 349 | { |
| 350 | addr->v4.sin_family = AF_INET; |
| 351 | addr->v4.sin_addr.s_addr = INADDR_ANY; |
| 352 | addr->v4.sin_port = port; |
| 353 | } |
| 354 | |
| 355 | /* Is this a wildcard address? */ |
| 356 | static int sctp_v4_is_any(const union sctp_addr *addr) |
| 357 | { |
| 358 | return INADDR_ANY == addr->v4.sin_addr.s_addr; |
| 359 | } |
| 360 | |
| 361 | /* This function checks if the address is a valid address to be used for |
| 362 | * SCTP binding. |
| 363 | * |
| 364 | * Output: |
| 365 | * Return 0 - If the address is a non-unicast or an illegal address. |
| 366 | * Return 1 - If the address is a unicast. |
| 367 | */ |
Vlad Yasevich | 5636bef | 2006-06-17 22:55:35 -0700 | [diff] [blame] | 368 | static int sctp_v4_addr_valid(union sctp_addr *addr, |
| 369 | struct sctp_sock *sp, |
| 370 | const struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | { |
| 372 | /* Is this a non-unicast address or a unusable SCTP address? */ |
| 373 | if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr)) |
| 374 | return 0; |
| 375 | |
Vlad Yasevich | 5636bef | 2006-06-17 22:55:35 -0700 | [diff] [blame] | 376 | /* Is this a broadcast address? */ |
| 377 | if (skb && ((struct rtable *)skb->dst)->rt_flags & RTCF_BROADCAST) |
| 378 | return 0; |
| 379 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | return 1; |
| 381 | } |
| 382 | |
| 383 | /* Should this be available for binding? */ |
| 384 | static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) |
| 385 | { |
| 386 | int ret = inet_addr_type(addr->v4.sin_addr.s_addr); |
| 387 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
Neil Horman | cdac4e0 | 2005-06-13 15:12:33 -0700 | [diff] [blame] | 389 | if (addr->v4.sin_addr.s_addr != INADDR_ANY && |
| 390 | ret != RTN_LOCAL && |
| 391 | !sp->inet.freebind && |
| 392 | !sysctl_ip_nonlocal_bind) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | return 0; |
Neil Horman | cdac4e0 | 2005-06-13 15:12:33 -0700 | [diff] [blame] | 394 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | return 1; |
| 396 | } |
| 397 | |
| 398 | /* Checking the loopback, private and other address scopes as defined in |
| 399 | * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 |
| 400 | * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. |
| 401 | * |
| 402 | * Level 0 - unusable SCTP addresses |
| 403 | * Level 1 - loopback address |
| 404 | * Level 2 - link-local addresses |
| 405 | * Level 3 - private addresses. |
| 406 | * Level 4 - global addresses |
| 407 | * For INIT and INIT-ACK address list, let L be the level of |
| 408 | * of requested destination address, sender and receiver |
| 409 | * SHOULD include all of its addresses with level greater |
| 410 | * than or equal to L. |
| 411 | */ |
| 412 | static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) |
| 413 | { |
| 414 | sctp_scope_t retval; |
| 415 | |
| 416 | /* Should IPv4 scoping be a sysctl configurable option |
| 417 | * so users can turn it off (default on) for certain |
| 418 | * unconventional networking environments? |
| 419 | */ |
| 420 | |
| 421 | /* Check for unusable SCTP addresses. */ |
| 422 | if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr)) { |
| 423 | retval = SCTP_SCOPE_UNUSABLE; |
| 424 | } else if (LOOPBACK(addr->v4.sin_addr.s_addr)) { |
| 425 | retval = SCTP_SCOPE_LOOPBACK; |
| 426 | } else if (IS_IPV4_LINK_ADDRESS(&addr->v4.sin_addr.s_addr)) { |
| 427 | retval = SCTP_SCOPE_LINK; |
| 428 | } else if (IS_IPV4_PRIVATE_ADDRESS(&addr->v4.sin_addr.s_addr)) { |
| 429 | retval = SCTP_SCOPE_PRIVATE; |
| 430 | } else { |
| 431 | retval = SCTP_SCOPE_GLOBAL; |
| 432 | } |
| 433 | |
| 434 | return retval; |
| 435 | } |
| 436 | |
| 437 | /* Returns a valid dst cache entry for the given source and destination ip |
| 438 | * addresses. If an association is passed, trys to get a dst entry with a |
| 439 | * source address that matches an address in the bind address list. |
| 440 | */ |
| 441 | static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc, |
| 442 | union sctp_addr *daddr, |
| 443 | union sctp_addr *saddr) |
| 444 | { |
| 445 | struct rtable *rt; |
| 446 | struct flowi fl; |
| 447 | struct sctp_bind_addr *bp; |
| 448 | rwlock_t *addr_lock; |
| 449 | struct sctp_sockaddr_entry *laddr; |
| 450 | struct list_head *pos; |
| 451 | struct dst_entry *dst = NULL; |
| 452 | union sctp_addr dst_saddr; |
| 453 | |
| 454 | memset(&fl, 0x0, sizeof(struct flowi)); |
| 455 | fl.fl4_dst = daddr->v4.sin_addr.s_addr; |
| 456 | fl.proto = IPPROTO_SCTP; |
| 457 | if (asoc) { |
| 458 | fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk); |
| 459 | fl.oif = asoc->base.sk->sk_bound_dev_if; |
| 460 | } |
| 461 | if (saddr) |
| 462 | fl.fl4_src = saddr->v4.sin_addr.s_addr; |
| 463 | |
| 464 | SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ", |
| 465 | __FUNCTION__, NIPQUAD(fl.fl4_dst), |
| 466 | NIPQUAD(fl.fl4_src)); |
| 467 | |
| 468 | if (!ip_route_output_key(&rt, &fl)) { |
| 469 | dst = &rt->u.dst; |
| 470 | } |
| 471 | |
| 472 | /* If there is no association or if a source address is passed, no |
| 473 | * more validation is required. |
| 474 | */ |
| 475 | if (!asoc || saddr) |
| 476 | goto out; |
| 477 | |
| 478 | bp = &asoc->base.bind_addr; |
| 479 | addr_lock = &asoc->base.addr_lock; |
| 480 | |
| 481 | if (dst) { |
| 482 | /* Walk through the bind address list and look for a bind |
| 483 | * address that matches the source address of the returned dst. |
| 484 | */ |
| 485 | sctp_read_lock(addr_lock); |
| 486 | list_for_each(pos, &bp->address_list) { |
| 487 | laddr = list_entry(pos, struct sctp_sockaddr_entry, |
| 488 | list); |
| 489 | sctp_v4_dst_saddr(&dst_saddr, dst, bp->port); |
| 490 | if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) |
| 491 | goto out_unlock; |
| 492 | } |
| 493 | sctp_read_unlock(addr_lock); |
| 494 | |
| 495 | /* None of the bound addresses match the source address of the |
| 496 | * dst. So release it. |
| 497 | */ |
| 498 | dst_release(dst); |
| 499 | dst = NULL; |
| 500 | } |
| 501 | |
| 502 | /* Walk through the bind address list and try to get a dst that |
| 503 | * matches a bind address as the source address. |
| 504 | */ |
| 505 | sctp_read_lock(addr_lock); |
| 506 | list_for_each(pos, &bp->address_list) { |
| 507 | laddr = list_entry(pos, struct sctp_sockaddr_entry, list); |
| 508 | |
| 509 | if (AF_INET == laddr->a.sa.sa_family) { |
| 510 | fl.fl4_src = laddr->a.v4.sin_addr.s_addr; |
| 511 | if (!ip_route_output_key(&rt, &fl)) { |
| 512 | dst = &rt->u.dst; |
| 513 | goto out_unlock; |
| 514 | } |
| 515 | } |
| 516 | } |
| 517 | |
| 518 | out_unlock: |
| 519 | sctp_read_unlock(addr_lock); |
| 520 | out: |
| 521 | if (dst) |
| 522 | SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n", |
| 523 | NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src)); |
| 524 | else |
| 525 | SCTP_DEBUG_PRINTK("NO ROUTE\n"); |
| 526 | |
| 527 | return dst; |
| 528 | } |
| 529 | |
| 530 | /* For v4, the source address is cached in the route entry(dst). So no need |
| 531 | * to cache it separately and hence this is an empty routine. |
| 532 | */ |
| 533 | static void sctp_v4_get_saddr(struct sctp_association *asoc, |
| 534 | struct dst_entry *dst, |
| 535 | union sctp_addr *daddr, |
| 536 | union sctp_addr *saddr) |
| 537 | { |
| 538 | struct rtable *rt = (struct rtable *)dst; |
| 539 | |
Vladislav Yasevich | 23ec47a | 2005-11-11 16:05:55 -0800 | [diff] [blame] | 540 | if (!asoc) |
| 541 | return; |
| 542 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | if (rt) { |
| 544 | saddr->v4.sin_family = AF_INET; |
| 545 | saddr->v4.sin_port = asoc->base.bind_addr.port; |
| 546 | saddr->v4.sin_addr.s_addr = rt->rt_src; |
| 547 | } |
| 548 | } |
| 549 | |
| 550 | /* What interface did this skb arrive on? */ |
| 551 | static int sctp_v4_skb_iif(const struct sk_buff *skb) |
| 552 | { |
| 553 | return ((struct rtable *)skb->dst)->rt_iif; |
| 554 | } |
| 555 | |
| 556 | /* Was this packet marked by Explicit Congestion Notification? */ |
| 557 | static int sctp_v4_is_ce(const struct sk_buff *skb) |
| 558 | { |
| 559 | return INET_ECN_is_ce(skb->nh.iph->tos); |
| 560 | } |
| 561 | |
| 562 | /* Create and initialize a new sk for the socket returned by accept(). */ |
| 563 | static struct sock *sctp_v4_create_accept_sk(struct sock *sk, |
| 564 | struct sctp_association *asoc) |
| 565 | { |
| 566 | struct inet_sock *inet = inet_sk(sk); |
| 567 | struct inet_sock *newinet; |
| 568 | struct sock *newsk = sk_alloc(PF_INET, GFP_KERNEL, sk->sk_prot, 1); |
| 569 | |
| 570 | if (!newsk) |
| 571 | goto out; |
| 572 | |
| 573 | sock_init_data(NULL, newsk); |
| 574 | |
| 575 | newsk->sk_type = SOCK_STREAM; |
| 576 | |
| 577 | newsk->sk_no_check = sk->sk_no_check; |
| 578 | newsk->sk_reuse = sk->sk_reuse; |
| 579 | newsk->sk_shutdown = sk->sk_shutdown; |
| 580 | |
| 581 | newsk->sk_destruct = inet_sock_destruct; |
| 582 | newsk->sk_family = PF_INET; |
| 583 | newsk->sk_protocol = IPPROTO_SCTP; |
| 584 | newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; |
| 585 | sock_reset_flag(newsk, SOCK_ZAPPED); |
| 586 | |
| 587 | newinet = inet_sk(newsk); |
| 588 | |
| 589 | /* Initialize sk's sport, dport, rcv_saddr and daddr for |
| 590 | * getsockname() and getpeername() |
| 591 | */ |
| 592 | newinet->sport = inet->sport; |
| 593 | newinet->saddr = inet->saddr; |
| 594 | newinet->rcv_saddr = inet->rcv_saddr; |
| 595 | newinet->dport = htons(asoc->peer.port); |
| 596 | newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; |
| 597 | newinet->pmtudisc = inet->pmtudisc; |
| 598 | newinet->id = 0; |
| 599 | |
| 600 | newinet->uc_ttl = -1; |
| 601 | newinet->mc_loop = 1; |
| 602 | newinet->mc_ttl = 1; |
| 603 | newinet->mc_index = 0; |
| 604 | newinet->mc_list = NULL; |
| 605 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 606 | sk_refcnt_debug_inc(newsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
| 608 | if (newsk->sk_prot->init(newsk)) { |
| 609 | sk_common_release(newsk); |
| 610 | newsk = NULL; |
| 611 | } |
| 612 | |
| 613 | out: |
| 614 | return newsk; |
| 615 | } |
| 616 | |
| 617 | /* Map address, empty for v4 family */ |
| 618 | static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) |
| 619 | { |
| 620 | /* Empty */ |
| 621 | } |
| 622 | |
| 623 | /* Dump the v4 addr to the seq file. */ |
| 624 | static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) |
| 625 | { |
| 626 | seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr)); |
| 627 | } |
| 628 | |
| 629 | /* Event handler for inet address addition/deletion events. |
| 630 | * Basically, whenever there is an event, we re-build our local address list. |
| 631 | */ |
| 632 | int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, |
| 633 | void *ptr) |
| 634 | { |
| 635 | unsigned long flags; |
| 636 | |
| 637 | sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags); |
| 638 | __sctp_free_local_addr_list(); |
| 639 | __sctp_get_local_addr_list(); |
| 640 | sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags); |
| 641 | |
| 642 | return NOTIFY_DONE; |
| 643 | } |
| 644 | |
| 645 | /* |
| 646 | * Initialize the control inode/socket with a control endpoint data |
| 647 | * structure. This endpoint is reserved exclusively for the OOTB processing. |
| 648 | */ |
| 649 | static int sctp_ctl_sock_init(void) |
| 650 | { |
| 651 | int err; |
| 652 | sa_family_t family; |
| 653 | |
| 654 | if (sctp_get_pf_specific(PF_INET6)) |
| 655 | family = PF_INET6; |
| 656 | else |
| 657 | family = PF_INET; |
| 658 | |
| 659 | err = sock_create_kern(family, SOCK_SEQPACKET, IPPROTO_SCTP, |
| 660 | &sctp_ctl_socket); |
| 661 | if (err < 0) { |
| 662 | printk(KERN_ERR |
| 663 | "SCTP: Failed to create the SCTP control socket.\n"); |
| 664 | return err; |
| 665 | } |
| 666 | sctp_ctl_socket->sk->sk_allocation = GFP_ATOMIC; |
| 667 | inet_sk(sctp_ctl_socket->sk)->uc_ttl = -1; |
| 668 | |
| 669 | return 0; |
| 670 | } |
| 671 | |
| 672 | /* Register address family specific functions. */ |
| 673 | int sctp_register_af(struct sctp_af *af) |
| 674 | { |
| 675 | switch (af->sa_family) { |
| 676 | case AF_INET: |
| 677 | if (sctp_af_v4_specific) |
| 678 | return 0; |
| 679 | sctp_af_v4_specific = af; |
| 680 | break; |
| 681 | case AF_INET6: |
| 682 | if (sctp_af_v6_specific) |
| 683 | return 0; |
| 684 | sctp_af_v6_specific = af; |
| 685 | break; |
| 686 | default: |
| 687 | return 0; |
| 688 | } |
| 689 | |
| 690 | INIT_LIST_HEAD(&af->list); |
| 691 | list_add_tail(&af->list, &sctp_address_families); |
| 692 | return 1; |
| 693 | } |
| 694 | |
| 695 | /* Get the table of functions for manipulating a particular address |
| 696 | * family. |
| 697 | */ |
| 698 | struct sctp_af *sctp_get_af_specific(sa_family_t family) |
| 699 | { |
| 700 | switch (family) { |
| 701 | case AF_INET: |
| 702 | return sctp_af_v4_specific; |
| 703 | case AF_INET6: |
| 704 | return sctp_af_v6_specific; |
| 705 | default: |
| 706 | return NULL; |
| 707 | } |
| 708 | } |
| 709 | |
| 710 | /* Common code to initialize a AF_INET msg_name. */ |
| 711 | static void sctp_inet_msgname(char *msgname, int *addr_len) |
| 712 | { |
| 713 | struct sockaddr_in *sin; |
| 714 | |
| 715 | sin = (struct sockaddr_in *)msgname; |
| 716 | *addr_len = sizeof(struct sockaddr_in); |
| 717 | sin->sin_family = AF_INET; |
| 718 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); |
| 719 | } |
| 720 | |
| 721 | /* Copy the primary address of the peer primary address as the msg_name. */ |
| 722 | static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, |
| 723 | int *addr_len) |
| 724 | { |
| 725 | struct sockaddr_in *sin, *sinfrom; |
| 726 | |
| 727 | if (msgname) { |
| 728 | struct sctp_association *asoc; |
| 729 | |
| 730 | asoc = event->asoc; |
| 731 | sctp_inet_msgname(msgname, addr_len); |
| 732 | sin = (struct sockaddr_in *)msgname; |
| 733 | sinfrom = &asoc->peer.primary_addr.v4; |
| 734 | sin->sin_port = htons(asoc->peer.port); |
| 735 | sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; |
| 736 | } |
| 737 | } |
| 738 | |
| 739 | /* Initialize and copy out a msgname from an inbound skb. */ |
| 740 | static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) |
| 741 | { |
| 742 | struct sctphdr *sh; |
| 743 | struct sockaddr_in *sin; |
| 744 | |
| 745 | if (msgname) { |
| 746 | sctp_inet_msgname(msgname, len); |
| 747 | sin = (struct sockaddr_in *)msgname; |
| 748 | sh = (struct sctphdr *)skb->h.raw; |
| 749 | sin->sin_port = sh->source; |
| 750 | sin->sin_addr.s_addr = skb->nh.iph->saddr; |
| 751 | } |
| 752 | } |
| 753 | |
| 754 | /* Do we support this AF? */ |
| 755 | static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) |
| 756 | { |
| 757 | /* PF_INET only supports AF_INET addresses. */ |
| 758 | return (AF_INET == family); |
| 759 | } |
| 760 | |
| 761 | /* Address matching with wildcards allowed. */ |
| 762 | static int sctp_inet_cmp_addr(const union sctp_addr *addr1, |
| 763 | const union sctp_addr *addr2, |
| 764 | struct sctp_sock *opt) |
| 765 | { |
| 766 | /* PF_INET only supports AF_INET addresses. */ |
| 767 | if (addr1->sa.sa_family != addr2->sa.sa_family) |
| 768 | return 0; |
| 769 | if (INADDR_ANY == addr1->v4.sin_addr.s_addr || |
| 770 | INADDR_ANY == addr2->v4.sin_addr.s_addr) |
| 771 | return 1; |
| 772 | if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) |
| 773 | return 1; |
| 774 | |
| 775 | return 0; |
| 776 | } |
| 777 | |
| 778 | /* Verify that provided sockaddr looks bindable. Common verification has |
| 779 | * already been taken care of. |
| 780 | */ |
| 781 | static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) |
| 782 | { |
| 783 | return sctp_v4_available(addr, opt); |
| 784 | } |
| 785 | |
| 786 | /* Verify that sockaddr looks sendable. Common verification has already |
| 787 | * been taken care of. |
| 788 | */ |
| 789 | static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) |
| 790 | { |
| 791 | return 1; |
| 792 | } |
| 793 | |
| 794 | /* Fill in Supported Address Type information for INIT and INIT-ACK |
| 795 | * chunks. Returns number of addresses supported. |
| 796 | */ |
| 797 | static int sctp_inet_supported_addrs(const struct sctp_sock *opt, |
| 798 | __u16 *types) |
| 799 | { |
| 800 | types[0] = SCTP_PARAM_IPV4_ADDRESS; |
| 801 | return 1; |
| 802 | } |
| 803 | |
| 804 | /* Wrapper routine that calls the ip transmit routine. */ |
| 805 | static inline int sctp_v4_xmit(struct sk_buff *skb, |
| 806 | struct sctp_transport *transport, int ipfragok) |
| 807 | { |
| 808 | SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, " |
| 809 | "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n", |
| 810 | __FUNCTION__, skb, skb->len, |
| 811 | NIPQUAD(((struct rtable *)skb->dst)->rt_src), |
| 812 | NIPQUAD(((struct rtable *)skb->dst)->rt_dst)); |
| 813 | |
| 814 | SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); |
| 815 | return ip_queue_xmit(skb, ipfragok); |
| 816 | } |
| 817 | |
| 818 | static struct sctp_af sctp_ipv4_specific; |
| 819 | |
| 820 | static struct sctp_pf sctp_pf_inet = { |
| 821 | .event_msgname = sctp_inet_event_msgname, |
| 822 | .skb_msgname = sctp_inet_skb_msgname, |
| 823 | .af_supported = sctp_inet_af_supported, |
| 824 | .cmp_addr = sctp_inet_cmp_addr, |
| 825 | .bind_verify = sctp_inet_bind_verify, |
| 826 | .send_verify = sctp_inet_send_verify, |
| 827 | .supported_addrs = sctp_inet_supported_addrs, |
| 828 | .create_accept_sk = sctp_v4_create_accept_sk, |
| 829 | .addr_v4map = sctp_v4_addr_v4map, |
| 830 | .af = &sctp_ipv4_specific, |
| 831 | }; |
| 832 | |
| 833 | /* Notifier for inetaddr addition/deletion events. */ |
| 834 | static struct notifier_block sctp_inetaddr_notifier = { |
| 835 | .notifier_call = sctp_inetaddr_event, |
| 836 | }; |
| 837 | |
| 838 | /* Socket operations. */ |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 839 | static const struct proto_ops inet_seqpacket_ops = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 840 | .family = PF_INET, |
| 841 | .owner = THIS_MODULE, |
| 842 | .release = inet_release, /* Needs to be wrapped... */ |
| 843 | .bind = inet_bind, |
| 844 | .connect = inet_dgram_connect, |
| 845 | .socketpair = sock_no_socketpair, |
| 846 | .accept = inet_accept, |
| 847 | .getname = inet_getname, /* Semantics are different. */ |
| 848 | .poll = sctp_poll, |
| 849 | .ioctl = inet_ioctl, |
| 850 | .listen = sctp_inet_listen, |
| 851 | .shutdown = inet_shutdown, /* Looks harmless. */ |
| 852 | .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ |
| 853 | .getsockopt = sock_common_getsockopt, |
| 854 | .sendmsg = inet_sendmsg, |
| 855 | .recvmsg = sock_common_recvmsg, |
| 856 | .mmap = sock_no_mmap, |
| 857 | .sendpage = sock_no_sendpage, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 858 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 859 | .compat_setsockopt = compat_sock_common_setsockopt, |
| 860 | .compat_getsockopt = compat_sock_common_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 861 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | }; |
| 863 | |
| 864 | /* Registration with AF_INET family. */ |
| 865 | static struct inet_protosw sctp_seqpacket_protosw = { |
| 866 | .type = SOCK_SEQPACKET, |
| 867 | .protocol = IPPROTO_SCTP, |
| 868 | .prot = &sctp_prot, |
| 869 | .ops = &inet_seqpacket_ops, |
| 870 | .capability = -1, |
| 871 | .no_check = 0, |
| 872 | .flags = SCTP_PROTOSW_FLAG |
| 873 | }; |
| 874 | static struct inet_protosw sctp_stream_protosw = { |
| 875 | .type = SOCK_STREAM, |
| 876 | .protocol = IPPROTO_SCTP, |
| 877 | .prot = &sctp_prot, |
| 878 | .ops = &inet_seqpacket_ops, |
| 879 | .capability = -1, |
| 880 | .no_check = 0, |
| 881 | .flags = SCTP_PROTOSW_FLAG |
| 882 | }; |
| 883 | |
| 884 | /* Register with IP layer. */ |
| 885 | static struct net_protocol sctp_protocol = { |
| 886 | .handler = sctp_rcv, |
| 887 | .err_handler = sctp_v4_err, |
| 888 | .no_policy = 1, |
| 889 | }; |
| 890 | |
| 891 | /* IPv4 address related functions. */ |
| 892 | static struct sctp_af sctp_ipv4_specific = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 893 | .sa_family = AF_INET, |
| 894 | .sctp_xmit = sctp_v4_xmit, |
| 895 | .setsockopt = ip_setsockopt, |
| 896 | .getsockopt = ip_getsockopt, |
| 897 | .get_dst = sctp_v4_get_dst, |
| 898 | .get_saddr = sctp_v4_get_saddr, |
| 899 | .copy_addrlist = sctp_v4_copy_addrlist, |
| 900 | .from_skb = sctp_v4_from_skb, |
| 901 | .from_sk = sctp_v4_from_sk, |
| 902 | .to_sk_saddr = sctp_v4_to_sk_saddr, |
| 903 | .to_sk_daddr = sctp_v4_to_sk_daddr, |
| 904 | .from_addr_param = sctp_v4_from_addr_param, |
| 905 | .to_addr_param = sctp_v4_to_addr_param, |
| 906 | .dst_saddr = sctp_v4_dst_saddr, |
| 907 | .cmp_addr = sctp_v4_cmp_addr, |
| 908 | .addr_valid = sctp_v4_addr_valid, |
| 909 | .inaddr_any = sctp_v4_inaddr_any, |
| 910 | .is_any = sctp_v4_is_any, |
| 911 | .available = sctp_v4_available, |
| 912 | .scope = sctp_v4_scope, |
| 913 | .skb_iif = sctp_v4_skb_iif, |
| 914 | .is_ce = sctp_v4_is_ce, |
| 915 | .seq_dump_addr = sctp_v4_seq_dump_addr, |
| 916 | .net_header_len = sizeof(struct iphdr), |
| 917 | .sockaddr_len = sizeof(struct sockaddr_in), |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 918 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 919 | .compat_setsockopt = compat_ip_setsockopt, |
| 920 | .compat_getsockopt = compat_ip_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 921 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | }; |
| 923 | |
| 924 | struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { |
| 925 | |
| 926 | switch (family) { |
| 927 | case PF_INET: |
| 928 | return sctp_pf_inet_specific; |
| 929 | case PF_INET6: |
| 930 | return sctp_pf_inet6_specific; |
| 931 | default: |
| 932 | return NULL; |
| 933 | } |
| 934 | } |
| 935 | |
| 936 | /* Register the PF specific function table. */ |
| 937 | int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) |
| 938 | { |
| 939 | switch (family) { |
| 940 | case PF_INET: |
| 941 | if (sctp_pf_inet_specific) |
| 942 | return 0; |
| 943 | sctp_pf_inet_specific = pf; |
| 944 | break; |
| 945 | case PF_INET6: |
| 946 | if (sctp_pf_inet6_specific) |
| 947 | return 0; |
| 948 | sctp_pf_inet6_specific = pf; |
| 949 | break; |
| 950 | default: |
| 951 | return 0; |
| 952 | } |
| 953 | return 1; |
| 954 | } |
| 955 | |
| 956 | static int __init init_sctp_mibs(void) |
| 957 | { |
| 958 | sctp_statistics[0] = alloc_percpu(struct sctp_mib); |
| 959 | if (!sctp_statistics[0]) |
| 960 | return -ENOMEM; |
| 961 | sctp_statistics[1] = alloc_percpu(struct sctp_mib); |
| 962 | if (!sctp_statistics[1]) { |
| 963 | free_percpu(sctp_statistics[0]); |
| 964 | return -ENOMEM; |
| 965 | } |
| 966 | return 0; |
| 967 | |
| 968 | } |
| 969 | |
| 970 | static void cleanup_sctp_mibs(void) |
| 971 | { |
| 972 | free_percpu(sctp_statistics[0]); |
| 973 | free_percpu(sctp_statistics[1]); |
| 974 | } |
| 975 | |
| 976 | /* Initialize the universe into something sensible. */ |
| 977 | SCTP_STATIC __init int sctp_init(void) |
| 978 | { |
| 979 | int i; |
| 980 | int status = -EINVAL; |
| 981 | unsigned long goal; |
| 982 | int order; |
| 983 | |
| 984 | /* SCTP_DEBUG sanity check. */ |
| 985 | if (!sctp_sanity_check()) |
| 986 | goto out; |
| 987 | |
| 988 | status = proto_register(&sctp_prot, 1); |
| 989 | if (status) |
| 990 | goto out; |
| 991 | |
| 992 | /* Add SCTP to inet_protos hash table. */ |
| 993 | status = -EAGAIN; |
| 994 | if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) |
| 995 | goto err_add_protocol; |
| 996 | |
| 997 | /* Add SCTP(TCP and UDP style) to inetsw linked list. */ |
| 998 | inet_register_protosw(&sctp_seqpacket_protosw); |
| 999 | inet_register_protosw(&sctp_stream_protosw); |
| 1000 | |
| 1001 | /* Allocate a cache pools. */ |
| 1002 | status = -ENOBUFS; |
| 1003 | sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", |
| 1004 | sizeof(struct sctp_bind_bucket), |
| 1005 | 0, SLAB_HWCACHE_ALIGN, |
| 1006 | NULL, NULL); |
| 1007 | |
| 1008 | if (!sctp_bucket_cachep) |
| 1009 | goto err_bucket_cachep; |
| 1010 | |
| 1011 | sctp_chunk_cachep = kmem_cache_create("sctp_chunk", |
| 1012 | sizeof(struct sctp_chunk), |
| 1013 | 0, SLAB_HWCACHE_ALIGN, |
| 1014 | NULL, NULL); |
| 1015 | if (!sctp_chunk_cachep) |
| 1016 | goto err_chunk_cachep; |
| 1017 | |
| 1018 | /* Allocate and initialise sctp mibs. */ |
| 1019 | status = init_sctp_mibs(); |
| 1020 | if (status) |
| 1021 | goto err_init_mibs; |
| 1022 | |
| 1023 | /* Initialize proc fs directory. */ |
| 1024 | status = sctp_proc_init(); |
| 1025 | if (status) |
| 1026 | goto err_init_proc; |
| 1027 | |
| 1028 | /* Initialize object count debugging. */ |
| 1029 | sctp_dbg_objcnt_init(); |
| 1030 | |
| 1031 | /* Initialize the SCTP specific PF functions. */ |
| 1032 | sctp_register_pf(&sctp_pf_inet, PF_INET); |
| 1033 | /* |
| 1034 | * 14. Suggested SCTP Protocol Parameter Values |
| 1035 | */ |
| 1036 | /* The following protocol parameters are RECOMMENDED: */ |
| 1037 | /* RTO.Initial - 3 seconds */ |
| 1038 | sctp_rto_initial = SCTP_RTO_INITIAL; |
| 1039 | /* RTO.Min - 1 second */ |
| 1040 | sctp_rto_min = SCTP_RTO_MIN; |
| 1041 | /* RTO.Max - 60 seconds */ |
| 1042 | sctp_rto_max = SCTP_RTO_MAX; |
| 1043 | /* RTO.Alpha - 1/8 */ |
| 1044 | sctp_rto_alpha = SCTP_RTO_ALPHA; |
| 1045 | /* RTO.Beta - 1/4 */ |
| 1046 | sctp_rto_beta = SCTP_RTO_BETA; |
| 1047 | |
| 1048 | /* Valid.Cookie.Life - 60 seconds */ |
| 1049 | sctp_valid_cookie_life = 60 * HZ; |
| 1050 | |
| 1051 | /* Whether Cookie Preservative is enabled(1) or not(0) */ |
| 1052 | sctp_cookie_preserve_enable = 1; |
| 1053 | |
| 1054 | /* Max.Burst - 4 */ |
| 1055 | sctp_max_burst = SCTP_MAX_BURST; |
| 1056 | |
| 1057 | /* Association.Max.Retrans - 10 attempts |
| 1058 | * Path.Max.Retrans - 5 attempts (per destination address) |
| 1059 | * Max.Init.Retransmits - 8 attempts |
| 1060 | */ |
| 1061 | sctp_max_retrans_association = 10; |
| 1062 | sctp_max_retrans_path = 5; |
| 1063 | sctp_max_retrans_init = 8; |
| 1064 | |
Neil Horman | 4eb701d | 2005-04-28 12:02:04 -0700 | [diff] [blame] | 1065 | /* Sendbuffer growth - do per-socket accounting */ |
| 1066 | sctp_sndbuf_policy = 0; |
| 1067 | |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 1068 | /* Rcvbuffer growth - do per-socket accounting */ |
| 1069 | sctp_rcvbuf_policy = 0; |
| 1070 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | /* HB.interval - 30 seconds */ |
Vlad Yasevich | 2f85a42 | 2005-06-28 13:24:23 -0700 | [diff] [blame] | 1072 | sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; |
| 1073 | |
| 1074 | /* delayed SACK timeout */ |
| 1075 | sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | |
| 1077 | /* Implementation specific variables. */ |
| 1078 | |
| 1079 | /* Initialize default stream count setup information. */ |
| 1080 | sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; |
| 1081 | sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; |
| 1082 | |
| 1083 | /* Initialize handle used for association ids. */ |
| 1084 | idr_init(&sctp_assocs_id); |
| 1085 | |
| 1086 | /* Size and allocate the association hash table. |
| 1087 | * The methodology is similar to that of the tcp hash tables. |
| 1088 | */ |
| 1089 | if (num_physpages >= (128 * 1024)) |
| 1090 | goal = num_physpages >> (22 - PAGE_SHIFT); |
| 1091 | else |
| 1092 | goal = num_physpages >> (24 - PAGE_SHIFT); |
| 1093 | |
| 1094 | for (order = 0; (1UL << order) < goal; order++) |
| 1095 | ; |
| 1096 | |
| 1097 | do { |
| 1098 | sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / |
| 1099 | sizeof(struct sctp_hashbucket); |
| 1100 | if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) |
| 1101 | continue; |
| 1102 | sctp_assoc_hashtable = (struct sctp_hashbucket *) |
| 1103 | __get_free_pages(GFP_ATOMIC, order); |
| 1104 | } while (!sctp_assoc_hashtable && --order > 0); |
| 1105 | if (!sctp_assoc_hashtable) { |
| 1106 | printk(KERN_ERR "SCTP: Failed association hash alloc.\n"); |
| 1107 | status = -ENOMEM; |
| 1108 | goto err_ahash_alloc; |
| 1109 | } |
| 1110 | for (i = 0; i < sctp_assoc_hashsize; i++) { |
| 1111 | rwlock_init(&sctp_assoc_hashtable[i].lock); |
| 1112 | sctp_assoc_hashtable[i].chain = NULL; |
| 1113 | } |
| 1114 | |
| 1115 | /* Allocate and initialize the endpoint hash table. */ |
| 1116 | sctp_ep_hashsize = 64; |
| 1117 | sctp_ep_hashtable = (struct sctp_hashbucket *) |
| 1118 | kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); |
| 1119 | if (!sctp_ep_hashtable) { |
| 1120 | printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n"); |
| 1121 | status = -ENOMEM; |
| 1122 | goto err_ehash_alloc; |
| 1123 | } |
| 1124 | for (i = 0; i < sctp_ep_hashsize; i++) { |
| 1125 | rwlock_init(&sctp_ep_hashtable[i].lock); |
| 1126 | sctp_ep_hashtable[i].chain = NULL; |
| 1127 | } |
| 1128 | |
| 1129 | /* Allocate and initialize the SCTP port hash table. */ |
| 1130 | do { |
| 1131 | sctp_port_hashsize = (1UL << order) * PAGE_SIZE / |
| 1132 | sizeof(struct sctp_bind_hashbucket); |
| 1133 | if ((sctp_port_hashsize > (64 * 1024)) && order > 0) |
| 1134 | continue; |
| 1135 | sctp_port_hashtable = (struct sctp_bind_hashbucket *) |
| 1136 | __get_free_pages(GFP_ATOMIC, order); |
| 1137 | } while (!sctp_port_hashtable && --order > 0); |
| 1138 | if (!sctp_port_hashtable) { |
| 1139 | printk(KERN_ERR "SCTP: Failed bind hash alloc."); |
| 1140 | status = -ENOMEM; |
| 1141 | goto err_bhash_alloc; |
| 1142 | } |
| 1143 | for (i = 0; i < sctp_port_hashsize; i++) { |
| 1144 | spin_lock_init(&sctp_port_hashtable[i].lock); |
| 1145 | sctp_port_hashtable[i].chain = NULL; |
| 1146 | } |
| 1147 | |
| 1148 | spin_lock_init(&sctp_port_alloc_lock); |
| 1149 | sctp_port_rover = sysctl_local_port_range[0] - 1; |
| 1150 | |
| 1151 | printk(KERN_INFO "SCTP: Hash tables configured " |
| 1152 | "(established %d bind %d)\n", |
| 1153 | sctp_assoc_hashsize, sctp_port_hashsize); |
| 1154 | |
| 1155 | /* Disable ADDIP by default. */ |
| 1156 | sctp_addip_enable = 0; |
| 1157 | |
| 1158 | /* Enable PR-SCTP by default. */ |
| 1159 | sctp_prsctp_enable = 1; |
| 1160 | |
| 1161 | sctp_sysctl_register(); |
| 1162 | |
| 1163 | INIT_LIST_HEAD(&sctp_address_families); |
| 1164 | sctp_register_af(&sctp_ipv4_specific); |
| 1165 | |
| 1166 | status = sctp_v6_init(); |
| 1167 | if (status) |
| 1168 | goto err_v6_init; |
| 1169 | |
| 1170 | /* Initialize the control inode/socket for handling OOTB packets. */ |
| 1171 | if ((status = sctp_ctl_sock_init())) { |
| 1172 | printk (KERN_ERR |
| 1173 | "SCTP: Failed to initialize the SCTP control sock.\n"); |
| 1174 | goto err_ctl_sock_init; |
| 1175 | } |
| 1176 | |
| 1177 | /* Initialize the local address list. */ |
| 1178 | INIT_LIST_HEAD(&sctp_local_addr_list); |
| 1179 | spin_lock_init(&sctp_local_addr_lock); |
| 1180 | |
| 1181 | /* Register notifier for inet address additions/deletions. */ |
| 1182 | register_inetaddr_notifier(&sctp_inetaddr_notifier); |
| 1183 | |
| 1184 | sctp_get_local_addr_list(); |
| 1185 | |
| 1186 | __unsafe(THIS_MODULE); |
| 1187 | status = 0; |
| 1188 | out: |
| 1189 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | err_ctl_sock_init: |
| 1191 | sctp_v6_exit(); |
| 1192 | err_v6_init: |
| 1193 | sctp_sysctl_unregister(); |
| 1194 | list_del(&sctp_ipv4_specific.list); |
| 1195 | free_pages((unsigned long)sctp_port_hashtable, |
| 1196 | get_order(sctp_port_hashsize * |
| 1197 | sizeof(struct sctp_bind_hashbucket))); |
| 1198 | err_bhash_alloc: |
| 1199 | kfree(sctp_ep_hashtable); |
| 1200 | err_ehash_alloc: |
| 1201 | free_pages((unsigned long)sctp_assoc_hashtable, |
| 1202 | get_order(sctp_assoc_hashsize * |
| 1203 | sizeof(struct sctp_hashbucket))); |
| 1204 | err_ahash_alloc: |
| 1205 | sctp_dbg_objcnt_exit(); |
| 1206 | err_init_proc: |
| 1207 | sctp_proc_exit(); |
| 1208 | cleanup_sctp_mibs(); |
| 1209 | err_init_mibs: |
| 1210 | kmem_cache_destroy(sctp_chunk_cachep); |
| 1211 | err_chunk_cachep: |
| 1212 | kmem_cache_destroy(sctp_bucket_cachep); |
| 1213 | err_bucket_cachep: |
| 1214 | inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); |
| 1215 | inet_unregister_protosw(&sctp_seqpacket_protosw); |
| 1216 | inet_unregister_protosw(&sctp_stream_protosw); |
Neil Horman | 5e6bc34 | 2005-04-28 11:59:49 -0700 | [diff] [blame] | 1217 | err_add_protocol: |
| 1218 | proto_unregister(&sctp_prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | goto out; |
| 1220 | } |
| 1221 | |
| 1222 | /* Exit handler for the SCTP protocol. */ |
| 1223 | SCTP_STATIC __exit void sctp_exit(void) |
| 1224 | { |
| 1225 | /* BUG. This should probably do something useful like clean |
| 1226 | * up all the remaining associations and all that memory. |
| 1227 | */ |
| 1228 | |
| 1229 | /* Unregister notifier for inet address additions/deletions. */ |
| 1230 | unregister_inetaddr_notifier(&sctp_inetaddr_notifier); |
| 1231 | |
| 1232 | /* Free the local address list. */ |
| 1233 | sctp_free_local_addr_list(); |
| 1234 | |
| 1235 | /* Free the control endpoint. */ |
| 1236 | sock_release(sctp_ctl_socket); |
| 1237 | |
| 1238 | sctp_v6_exit(); |
| 1239 | sctp_sysctl_unregister(); |
| 1240 | list_del(&sctp_ipv4_specific.list); |
| 1241 | |
| 1242 | free_pages((unsigned long)sctp_assoc_hashtable, |
| 1243 | get_order(sctp_assoc_hashsize * |
| 1244 | sizeof(struct sctp_hashbucket))); |
| 1245 | kfree(sctp_ep_hashtable); |
| 1246 | free_pages((unsigned long)sctp_port_hashtable, |
| 1247 | get_order(sctp_port_hashsize * |
| 1248 | sizeof(struct sctp_bind_hashbucket))); |
| 1249 | |
| 1250 | kmem_cache_destroy(sctp_chunk_cachep); |
| 1251 | kmem_cache_destroy(sctp_bucket_cachep); |
| 1252 | |
| 1253 | sctp_dbg_objcnt_exit(); |
| 1254 | sctp_proc_exit(); |
| 1255 | cleanup_sctp_mibs(); |
| 1256 | |
| 1257 | inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); |
| 1258 | inet_unregister_protosw(&sctp_seqpacket_protosw); |
| 1259 | inet_unregister_protosw(&sctp_stream_protosw); |
| 1260 | proto_unregister(&sctp_prot); |
| 1261 | } |
| 1262 | |
| 1263 | module_init(sctp_init); |
| 1264 | module_exit(sctp_exit); |
| 1265 | |
Arnaldo Carvalho de Melo | bb97d31 | 2005-08-09 20:19:14 -0700 | [diff] [blame] | 1266 | /* |
| 1267 | * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. |
| 1268 | */ |
| 1269 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); |
| 1271 | MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); |
| 1272 | MODULE_LICENSE("GPL"); |