Commit | Line | Data |
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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
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 | * | |
60c778b2 | 9 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
10 | * |
11 | * Initialization/cleanup for SCTP protocol support. | |
12 | * | |
60c778b2 | 13 | * This SCTP implementation is free software; |
1da177e4 LT |
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 | * | |
60c778b2 | 19 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
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> | |
4d93df0a | 54 | #include <linux/bootmem.h> |
457c4cbc | 55 | #include <net/net_namespace.h> |
1da177e4 LT |
56 | #include <net/protocol.h> |
57 | #include <net/ip.h> | |
58 | #include <net/ipv6.h> | |
14c85021 | 59 | #include <net/route.h> |
1da177e4 LT |
60 | #include <net/sctp/sctp.h> |
61 | #include <net/addrconf.h> | |
62 | #include <net/inet_common.h> | |
63 | #include <net/inet_ecn.h> | |
64 | ||
65 | /* Global data structures. */ | |
4cbf1cae | 66 | struct sctp_globals sctp_globals __read_mostly; |
ba89966c | 67 | DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly; |
1da177e4 | 68 | |
c4e85f82 FW |
69 | #ifdef CONFIG_PROC_FS |
70 | struct proc_dir_entry *proc_net_sctp; | |
71 | #endif | |
72 | ||
1da177e4 LT |
73 | struct idr sctp_assocs_id; |
74 | DEFINE_SPINLOCK(sctp_assocs_id_lock); | |
75 | ||
76 | /* This is the global socket data structure used for responding to | |
77 | * the Out-of-the-blue (OOTB) packets. A control sock will be created | |
78 | * for this socket at the initialization time. | |
79 | */ | |
8258175c | 80 | static struct sock *sctp_ctl_sock; |
1da177e4 LT |
81 | |
82 | static struct sctp_pf *sctp_pf_inet6_specific; | |
83 | static struct sctp_pf *sctp_pf_inet_specific; | |
84 | static struct sctp_af *sctp_af_v4_specific; | |
85 | static struct sctp_af *sctp_af_v6_specific; | |
86 | ||
e18b890b CL |
87 | struct kmem_cache *sctp_chunk_cachep __read_mostly; |
88 | struct kmem_cache *sctp_bucket_cachep __read_mostly; | |
1da177e4 | 89 | |
007e3936 VY |
90 | int sysctl_sctp_mem[3]; |
91 | int sysctl_sctp_rmem[3]; | |
92 | int sysctl_sctp_wmem[3]; | |
4d93df0a | 93 | |
1da177e4 LT |
94 | /* Return the address of the control sock. */ |
95 | struct sock *sctp_get_ctl_sock(void) | |
96 | { | |
8258175c | 97 | return sctp_ctl_sock; |
1da177e4 LT |
98 | } |
99 | ||
100 | /* Set up the proc fs entry for the SCTP protocol. */ | |
101 | static __init int sctp_proc_init(void) | |
102 | { | |
c4e85f82 | 103 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
104 | if (!proc_net_sctp) { |
105 | struct proc_dir_entry *ent; | |
457c4cbc | 106 | ent = proc_mkdir("sctp", init_net.proc_net); |
1da177e4 LT |
107 | if (ent) { |
108 | ent->owner = THIS_MODULE; | |
109 | proc_net_sctp = ent; | |
110 | } else | |
111 | goto out_nomem; | |
112 | } | |
113 | ||
114 | if (sctp_snmp_proc_init()) | |
80896a35 | 115 | goto out_snmp_proc_init; |
1da177e4 | 116 | if (sctp_eps_proc_init()) |
80896a35 | 117 | goto out_eps_proc_init; |
1da177e4 | 118 | if (sctp_assocs_proc_init()) |
80896a35 | 119 | goto out_assocs_proc_init; |
20c2c1fd | 120 | if (sctp_remaddr_proc_init()) |
caea902f | 121 | goto out_remaddr_proc_init; |
1da177e4 LT |
122 | |
123 | return 0; | |
124 | ||
caea902f | 125 | out_remaddr_proc_init: |
3d00fb9e | 126 | sctp_assocs_proc_exit(); |
80896a35 WY |
127 | out_assocs_proc_init: |
128 | sctp_eps_proc_exit(); | |
129 | out_eps_proc_init: | |
130 | sctp_snmp_proc_exit(); | |
131 | out_snmp_proc_init: | |
132 | if (proc_net_sctp) { | |
133 | proc_net_sctp = NULL; | |
134 | remove_proc_entry("sctp", init_net.proc_net); | |
135 | } | |
1da177e4 LT |
136 | out_nomem: |
137 | return -ENOMEM; | |
c4e85f82 FW |
138 | #else |
139 | return 0; | |
140 | #endif /* CONFIG_PROC_FS */ | |
1da177e4 LT |
141 | } |
142 | ||
d808ad9a | 143 | /* Clean up the proc fs entry for the SCTP protocol. |
1da177e4 LT |
144 | * Note: Do not make this __exit as it is used in the init error |
145 | * path. | |
146 | */ | |
147 | static void sctp_proc_exit(void) | |
148 | { | |
c4e85f82 | 149 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
150 | sctp_snmp_proc_exit(); |
151 | sctp_eps_proc_exit(); | |
152 | sctp_assocs_proc_exit(); | |
20c2c1fd | 153 | sctp_remaddr_proc_exit(); |
1da177e4 LT |
154 | |
155 | if (proc_net_sctp) { | |
156 | proc_net_sctp = NULL; | |
457c4cbc | 157 | remove_proc_entry("sctp", init_net.proc_net); |
1da177e4 | 158 | } |
c4e85f82 | 159 | #endif |
1da177e4 LT |
160 | } |
161 | ||
162 | /* Private helper to extract ipv4 address and stash them in | |
163 | * the protocol structure. | |
164 | */ | |
165 | static void sctp_v4_copy_addrlist(struct list_head *addrlist, | |
166 | struct net_device *dev) | |
167 | { | |
168 | struct in_device *in_dev; | |
169 | struct in_ifaddr *ifa; | |
170 | struct sctp_sockaddr_entry *addr; | |
171 | ||
172 | rcu_read_lock(); | |
e5ed6399 | 173 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { |
1da177e4 LT |
174 | rcu_read_unlock(); |
175 | return; | |
176 | } | |
177 | ||
178 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { | |
179 | /* Add the address to the local list. */ | |
180 | addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); | |
181 | if (addr) { | |
2a6fd78a AV |
182 | addr->a.v4.sin_family = AF_INET; |
183 | addr->a.v4.sin_port = 0; | |
184 | addr->a.v4.sin_addr.s_addr = ifa->ifa_local; | |
29303547 VY |
185 | addr->valid = 1; |
186 | INIT_LIST_HEAD(&addr->list); | |
187 | INIT_RCU_HEAD(&addr->rcu); | |
1da177e4 LT |
188 | list_add_tail(&addr->list, addrlist); |
189 | } | |
190 | } | |
191 | ||
192 | rcu_read_unlock(); | |
193 | } | |
194 | ||
195 | /* Extract our IP addresses from the system and stash them in the | |
196 | * protocol structure. | |
197 | */ | |
29c7cf96 | 198 | static void sctp_get_local_addr_list(void) |
1da177e4 LT |
199 | { |
200 | struct net_device *dev; | |
201 | struct list_head *pos; | |
202 | struct sctp_af *af; | |
203 | ||
204 | read_lock(&dev_base_lock); | |
881d966b | 205 | for_each_netdev(&init_net, dev) { |
1da177e4 LT |
206 | __list_for_each(pos, &sctp_address_families) { |
207 | af = list_entry(pos, struct sctp_af, list); | |
208 | af->copy_addrlist(&sctp_local_addr_list, dev); | |
209 | } | |
210 | } | |
211 | read_unlock(&dev_base_lock); | |
212 | } | |
213 | ||
1da177e4 | 214 | /* Free the existing local addresses. */ |
29c7cf96 | 215 | static void sctp_free_local_addr_list(void) |
1da177e4 LT |
216 | { |
217 | struct sctp_sockaddr_entry *addr; | |
218 | struct list_head *pos, *temp; | |
219 | ||
220 | list_for_each_safe(pos, temp, &sctp_local_addr_list) { | |
221 | addr = list_entry(pos, struct sctp_sockaddr_entry, list); | |
222 | list_del(pos); | |
223 | kfree(addr); | |
224 | } | |
225 | } | |
226 | ||
29303547 VY |
227 | void sctp_local_addr_free(struct rcu_head *head) |
228 | { | |
229 | struct sctp_sockaddr_entry *e = container_of(head, | |
230 | struct sctp_sockaddr_entry, rcu); | |
231 | kfree(e); | |
232 | } | |
233 | ||
1da177e4 LT |
234 | /* Copy the local addresses which are valid for 'scope' into 'bp'. */ |
235 | int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope, | |
dd0fc66f | 236 | gfp_t gfp, int copy_flags) |
1da177e4 LT |
237 | { |
238 | struct sctp_sockaddr_entry *addr; | |
239 | int error = 0; | |
1da177e4 | 240 | |
29303547 VY |
241 | rcu_read_lock(); |
242 | list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) { | |
243 | if (!addr->valid) | |
244 | continue; | |
6244be4e | 245 | if (sctp_in_scope(&addr->a, scope)) { |
1da177e4 LT |
246 | /* Now that the address is in scope, check to see if |
247 | * the address type is really supported by the local | |
248 | * sock as well as the remote peer. | |
249 | */ | |
6244be4e | 250 | if ((((AF_INET == addr->a.sa.sa_family) && |
1da177e4 | 251 | (copy_flags & SCTP_ADDR4_PEERSUPP))) || |
6244be4e | 252 | (((AF_INET6 == addr->a.sa.sa_family) && |
1da177e4 LT |
253 | (copy_flags & SCTP_ADDR6_ALLOWED) && |
254 | (copy_flags & SCTP_ADDR6_PEERSUPP)))) { | |
f57d96b2 VY |
255 | error = sctp_add_bind_addr(bp, &addr->a, |
256 | SCTP_ADDR_SRC, GFP_ATOMIC); | |
1da177e4 LT |
257 | if (error) |
258 | goto end_copy; | |
259 | } | |
260 | } | |
261 | } | |
262 | ||
263 | end_copy: | |
29303547 | 264 | rcu_read_unlock(); |
1da177e4 LT |
265 | return error; |
266 | } | |
267 | ||
268 | /* Initialize a sctp_addr from in incoming skb. */ | |
269 | static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, | |
270 | int is_saddr) | |
271 | { | |
272 | void *from; | |
d55c41b1 | 273 | __be16 *port; |
1da177e4 LT |
274 | struct sctphdr *sh; |
275 | ||
276 | port = &addr->v4.sin_port; | |
277 | addr->v4.sin_family = AF_INET; | |
278 | ||
2c0fd387 | 279 | sh = sctp_hdr(skb); |
1da177e4 | 280 | if (is_saddr) { |
d55c41b1 | 281 | *port = sh->source; |
eddc9ec5 | 282 | from = &ip_hdr(skb)->saddr; |
1da177e4 | 283 | } else { |
d55c41b1 | 284 | *port = sh->dest; |
eddc9ec5 | 285 | from = &ip_hdr(skb)->daddr; |
1da177e4 LT |
286 | } |
287 | memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); | |
288 | } | |
289 | ||
290 | /* Initialize an sctp_addr from a socket. */ | |
291 | static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) | |
292 | { | |
293 | addr->v4.sin_family = AF_INET; | |
7dcdbd95 | 294 | addr->v4.sin_port = 0; |
1da177e4 LT |
295 | addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr; |
296 | } | |
297 | ||
298 | /* Initialize sk->sk_rcv_saddr from sctp_addr. */ | |
299 | static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) | |
300 | { | |
301 | inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr; | |
302 | } | |
303 | ||
304 | /* Initialize sk->sk_daddr from sctp_addr. */ | |
305 | static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) | |
306 | { | |
307 | inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr; | |
308 | } | |
309 | ||
310 | /* Initialize a sctp_addr from an address parameter. */ | |
311 | static void sctp_v4_from_addr_param(union sctp_addr *addr, | |
312 | union sctp_addr_param *param, | |
dd86d136 | 313 | __be16 port, int iif) |
1da177e4 LT |
314 | { |
315 | addr->v4.sin_family = AF_INET; | |
316 | addr->v4.sin_port = port; | |
317 | addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; | |
318 | } | |
319 | ||
320 | /* Initialize an address parameter from a sctp_addr and return the length | |
321 | * of the address parameter. | |
322 | */ | |
323 | static int sctp_v4_to_addr_param(const union sctp_addr *addr, | |
324 | union sctp_addr_param *param) | |
325 | { | |
326 | int length = sizeof(sctp_ipv4addr_param_t); | |
327 | ||
328 | param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; | |
dbc16db1 | 329 | param->v4.param_hdr.length = htons(length); |
d808ad9a | 330 | param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; |
1da177e4 LT |
331 | |
332 | return length; | |
333 | } | |
334 | ||
335 | /* Initialize a sctp_addr from a dst_entry. */ | |
336 | static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst, | |
854d43a4 | 337 | __be16 port) |
1da177e4 LT |
338 | { |
339 | struct rtable *rt = (struct rtable *)dst; | |
340 | saddr->v4.sin_family = AF_INET; | |
341 | saddr->v4.sin_port = port; | |
342 | saddr->v4.sin_addr.s_addr = rt->rt_src; | |
343 | } | |
344 | ||
345 | /* Compare two addresses exactly. */ | |
346 | static int sctp_v4_cmp_addr(const union sctp_addr *addr1, | |
347 | const union sctp_addr *addr2) | |
348 | { | |
349 | if (addr1->sa.sa_family != addr2->sa.sa_family) | |
350 | return 0; | |
351 | if (addr1->v4.sin_port != addr2->v4.sin_port) | |
352 | return 0; | |
353 | if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) | |
354 | return 0; | |
355 | ||
356 | return 1; | |
357 | } | |
358 | ||
359 | /* Initialize addr struct to INADDR_ANY. */ | |
6fbfa9f9 | 360 | static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) |
1da177e4 LT |
361 | { |
362 | addr->v4.sin_family = AF_INET; | |
e6f1cebf | 363 | addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); |
1da177e4 LT |
364 | addr->v4.sin_port = port; |
365 | } | |
366 | ||
367 | /* Is this a wildcard address? */ | |
368 | static int sctp_v4_is_any(const union sctp_addr *addr) | |
369 | { | |
e6f1cebf | 370 | return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; |
1da177e4 LT |
371 | } |
372 | ||
373 | /* This function checks if the address is a valid address to be used for | |
374 | * SCTP binding. | |
375 | * | |
376 | * Output: | |
377 | * Return 0 - If the address is a non-unicast or an illegal address. | |
378 | * Return 1 - If the address is a unicast. | |
379 | */ | |
5636bef7 VY |
380 | static int sctp_v4_addr_valid(union sctp_addr *addr, |
381 | struct sctp_sock *sp, | |
382 | const struct sk_buff *skb) | |
1da177e4 LT |
383 | { |
384 | /* Is this a non-unicast address or a unusable SCTP address? */ | |
b5cb2bbc | 385 | if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) |
1da177e4 LT |
386 | return 0; |
387 | ||
d808ad9a | 388 | /* Is this a broadcast address? */ |
ee6b9673 | 389 | if (skb && skb->rtable->rt_flags & RTCF_BROADCAST) |
d808ad9a | 390 | return 0; |
5636bef7 | 391 | |
1da177e4 LT |
392 | return 1; |
393 | } | |
394 | ||
395 | /* Should this be available for binding? */ | |
396 | static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) | |
397 | { | |
6b175b26 | 398 | int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr); |
1da177e4 | 399 | |
1da177e4 | 400 | |
e6f1cebf | 401 | if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && |
cdac4e07 NH |
402 | ret != RTN_LOCAL && |
403 | !sp->inet.freebind && | |
404 | !sysctl_ip_nonlocal_bind) | |
1da177e4 | 405 | return 0; |
cdac4e07 | 406 | |
1da177e4 LT |
407 | return 1; |
408 | } | |
409 | ||
410 | /* Checking the loopback, private and other address scopes as defined in | |
411 | * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 | |
412 | * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. | |
413 | * | |
414 | * Level 0 - unusable SCTP addresses | |
415 | * Level 1 - loopback address | |
416 | * Level 2 - link-local addresses | |
417 | * Level 3 - private addresses. | |
418 | * Level 4 - global addresses | |
419 | * For INIT and INIT-ACK address list, let L be the level of | |
420 | * of requested destination address, sender and receiver | |
421 | * SHOULD include all of its addresses with level greater | |
422 | * than or equal to L. | |
423 | */ | |
424 | static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) | |
425 | { | |
426 | sctp_scope_t retval; | |
427 | ||
428 | /* Should IPv4 scoping be a sysctl configurable option | |
429 | * so users can turn it off (default on) for certain | |
430 | * unconventional networking environments? | |
431 | */ | |
432 | ||
433 | /* Check for unusable SCTP addresses. */ | |
b5cb2bbc | 434 | if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { |
1da177e4 | 435 | retval = SCTP_SCOPE_UNUSABLE; |
b5cb2bbc | 436 | } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { |
1da177e4 | 437 | retval = SCTP_SCOPE_LOOPBACK; |
b5cb2bbc | 438 | } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { |
1da177e4 | 439 | retval = SCTP_SCOPE_LINK; |
b5cb2bbc JP |
440 | } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || |
441 | ipv4_is_private_172(addr->v4.sin_addr.s_addr) || | |
442 | ipv4_is_private_192(addr->v4.sin_addr.s_addr)) { | |
1da177e4 LT |
443 | retval = SCTP_SCOPE_PRIVATE; |
444 | } else { | |
445 | retval = SCTP_SCOPE_GLOBAL; | |
446 | } | |
447 | ||
448 | return retval; | |
449 | } | |
450 | ||
451 | /* Returns a valid dst cache entry for the given source and destination ip | |
452 | * addresses. If an association is passed, trys to get a dst entry with a | |
453 | * source address that matches an address in the bind address list. | |
454 | */ | |
455 | static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc, | |
456 | union sctp_addr *daddr, | |
457 | union sctp_addr *saddr) | |
458 | { | |
459 | struct rtable *rt; | |
460 | struct flowi fl; | |
461 | struct sctp_bind_addr *bp; | |
1da177e4 | 462 | struct sctp_sockaddr_entry *laddr; |
1da177e4 LT |
463 | struct dst_entry *dst = NULL; |
464 | union sctp_addr dst_saddr; | |
465 | ||
466 | memset(&fl, 0x0, sizeof(struct flowi)); | |
467 | fl.fl4_dst = daddr->v4.sin_addr.s_addr; | |
468 | fl.proto = IPPROTO_SCTP; | |
469 | if (asoc) { | |
470 | fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk); | |
471 | fl.oif = asoc->base.sk->sk_bound_dev_if; | |
472 | } | |
473 | if (saddr) | |
474 | fl.fl4_src = saddr->v4.sin_addr.s_addr; | |
475 | ||
476 | SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ", | |
0dc47877 | 477 | __func__, NIPQUAD(fl.fl4_dst), |
1da177e4 LT |
478 | NIPQUAD(fl.fl4_src)); |
479 | ||
f206351a | 480 | if (!ip_route_output_key(&init_net, &rt, &fl)) { |
1da177e4 LT |
481 | dst = &rt->u.dst; |
482 | } | |
483 | ||
484 | /* If there is no association or if a source address is passed, no | |
485 | * more validation is required. | |
486 | */ | |
487 | if (!asoc || saddr) | |
488 | goto out; | |
489 | ||
490 | bp = &asoc->base.bind_addr; | |
1da177e4 LT |
491 | |
492 | if (dst) { | |
493 | /* Walk through the bind address list and look for a bind | |
494 | * address that matches the source address of the returned dst. | |
495 | */ | |
159c6bea | 496 | sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port)); |
559cf710 VY |
497 | rcu_read_lock(); |
498 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
f57d96b2 | 499 | if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC)) |
dc022a98 | 500 | continue; |
854d43a4 | 501 | if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) |
1da177e4 LT |
502 | goto out_unlock; |
503 | } | |
559cf710 | 504 | rcu_read_unlock(); |
1da177e4 LT |
505 | |
506 | /* None of the bound addresses match the source address of the | |
507 | * dst. So release it. | |
508 | */ | |
509 | dst_release(dst); | |
510 | dst = NULL; | |
511 | } | |
512 | ||
513 | /* Walk through the bind address list and try to get a dst that | |
514 | * matches a bind address as the source address. | |
515 | */ | |
559cf710 VY |
516 | rcu_read_lock(); |
517 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
518 | if (!laddr->valid) | |
519 | continue; | |
f57d96b2 | 520 | if ((laddr->state == SCTP_ADDR_SRC) && |
6244be4e AV |
521 | (AF_INET == laddr->a.sa.sa_family)) { |
522 | fl.fl4_src = laddr->a.v4.sin_addr.s_addr; | |
f206351a | 523 | if (!ip_route_output_key(&init_net, &rt, &fl)) { |
1da177e4 LT |
524 | dst = &rt->u.dst; |
525 | goto out_unlock; | |
526 | } | |
527 | } | |
528 | } | |
529 | ||
530 | out_unlock: | |
559cf710 | 531 | rcu_read_unlock(); |
1da177e4 LT |
532 | out: |
533 | if (dst) | |
534 | SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n", | |
d808ad9a | 535 | NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src)); |
1da177e4 LT |
536 | else |
537 | SCTP_DEBUG_PRINTK("NO ROUTE\n"); | |
538 | ||
539 | return dst; | |
540 | } | |
541 | ||
542 | /* For v4, the source address is cached in the route entry(dst). So no need | |
543 | * to cache it separately and hence this is an empty routine. | |
544 | */ | |
e5117101 YH |
545 | static void sctp_v4_get_saddr(struct sctp_sock *sk, |
546 | struct sctp_association *asoc, | |
1da177e4 LT |
547 | struct dst_entry *dst, |
548 | union sctp_addr *daddr, | |
549 | union sctp_addr *saddr) | |
550 | { | |
551 | struct rtable *rt = (struct rtable *)dst; | |
552 | ||
23ec47a0 VY |
553 | if (!asoc) |
554 | return; | |
555 | ||
1da177e4 LT |
556 | if (rt) { |
557 | saddr->v4.sin_family = AF_INET; | |
d3f7a54a | 558 | saddr->v4.sin_port = htons(asoc->base.bind_addr.port); |
d808ad9a | 559 | saddr->v4.sin_addr.s_addr = rt->rt_src; |
1da177e4 LT |
560 | } |
561 | } | |
562 | ||
563 | /* What interface did this skb arrive on? */ | |
564 | static int sctp_v4_skb_iif(const struct sk_buff *skb) | |
565 | { | |
ee6b9673 | 566 | return skb->rtable->rt_iif; |
1da177e4 LT |
567 | } |
568 | ||
569 | /* Was this packet marked by Explicit Congestion Notification? */ | |
570 | static int sctp_v4_is_ce(const struct sk_buff *skb) | |
571 | { | |
eddc9ec5 | 572 | return INET_ECN_is_ce(ip_hdr(skb)->tos); |
1da177e4 LT |
573 | } |
574 | ||
575 | /* Create and initialize a new sk for the socket returned by accept(). */ | |
576 | static struct sock *sctp_v4_create_accept_sk(struct sock *sk, | |
577 | struct sctp_association *asoc) | |
578 | { | |
579 | struct inet_sock *inet = inet_sk(sk); | |
580 | struct inet_sock *newinet; | |
3b1e0a65 | 581 | struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, |
6257ff21 | 582 | sk->sk_prot); |
1da177e4 LT |
583 | |
584 | if (!newsk) | |
585 | goto out; | |
586 | ||
587 | sock_init_data(NULL, newsk); | |
588 | ||
589 | newsk->sk_type = SOCK_STREAM; | |
590 | ||
591 | newsk->sk_no_check = sk->sk_no_check; | |
592 | newsk->sk_reuse = sk->sk_reuse; | |
593 | newsk->sk_shutdown = sk->sk_shutdown; | |
594 | ||
595 | newsk->sk_destruct = inet_sock_destruct; | |
596 | newsk->sk_family = PF_INET; | |
597 | newsk->sk_protocol = IPPROTO_SCTP; | |
598 | newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; | |
599 | sock_reset_flag(newsk, SOCK_ZAPPED); | |
600 | ||
601 | newinet = inet_sk(newsk); | |
602 | ||
603 | /* Initialize sk's sport, dport, rcv_saddr and daddr for | |
604 | * getsockname() and getpeername() | |
605 | */ | |
606 | newinet->sport = inet->sport; | |
607 | newinet->saddr = inet->saddr; | |
608 | newinet->rcv_saddr = inet->rcv_saddr; | |
609 | newinet->dport = htons(asoc->peer.port); | |
610 | newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; | |
611 | newinet->pmtudisc = inet->pmtudisc; | |
d808ad9a | 612 | newinet->id = asoc->next_tsn ^ jiffies; |
1da177e4 LT |
613 | |
614 | newinet->uc_ttl = -1; | |
615 | newinet->mc_loop = 1; | |
616 | newinet->mc_ttl = 1; | |
617 | newinet->mc_index = 0; | |
618 | newinet->mc_list = NULL; | |
619 | ||
e6848976 | 620 | sk_refcnt_debug_inc(newsk); |
1da177e4 LT |
621 | |
622 | if (newsk->sk_prot->init(newsk)) { | |
623 | sk_common_release(newsk); | |
624 | newsk = NULL; | |
625 | } | |
626 | ||
627 | out: | |
628 | return newsk; | |
629 | } | |
630 | ||
631 | /* Map address, empty for v4 family */ | |
632 | static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) | |
633 | { | |
634 | /* Empty */ | |
635 | } | |
636 | ||
637 | /* Dump the v4 addr to the seq file. */ | |
638 | static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) | |
639 | { | |
640 | seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr)); | |
641 | } | |
642 | ||
b9031d9d VY |
643 | static void sctp_v4_ecn_capable(struct sock *sk) |
644 | { | |
645 | INET_ECN_xmit(sk); | |
646 | } | |
647 | ||
29303547 VY |
648 | /* Event handler for inet address addition/deletion events. |
649 | * The sctp_local_addr_list needs to be protocted by a spin lock since | |
650 | * multiple notifiers (say IPv4 and IPv6) may be running at the same | |
651 | * time and thus corrupt the list. | |
652 | * The reader side is protected with RCU. | |
653 | */ | |
24123186 AB |
654 | static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, |
655 | void *ptr) | |
1da177e4 | 656 | { |
29c7cf96 | 657 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
29303547 VY |
658 | struct sctp_sockaddr_entry *addr = NULL; |
659 | struct sctp_sockaddr_entry *temp; | |
22626216 | 660 | int found = 0; |
1da177e4 | 661 | |
c346dca1 | 662 | if (dev_net(ifa->ifa_dev->dev) != &init_net) |
6133fb1a DL |
663 | return NOTIFY_DONE; |
664 | ||
29c7cf96 SS |
665 | switch (ev) { |
666 | case NETDEV_UP: | |
667 | addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); | |
668 | if (addr) { | |
669 | addr->a.v4.sin_family = AF_INET; | |
670 | addr->a.v4.sin_port = 0; | |
671 | addr->a.v4.sin_addr.s_addr = ifa->ifa_local; | |
29303547 VY |
672 | addr->valid = 1; |
673 | spin_lock_bh(&sctp_local_addr_lock); | |
674 | list_add_tail_rcu(&addr->list, &sctp_local_addr_list); | |
675 | spin_unlock_bh(&sctp_local_addr_lock); | |
29c7cf96 SS |
676 | } |
677 | break; | |
678 | case NETDEV_DOWN: | |
29303547 VY |
679 | spin_lock_bh(&sctp_local_addr_lock); |
680 | list_for_each_entry_safe(addr, temp, | |
681 | &sctp_local_addr_list, list) { | |
a40a7d15 PE |
682 | if (addr->a.sa.sa_family == AF_INET && |
683 | addr->a.v4.sin_addr.s_addr == | |
684 | ifa->ifa_local) { | |
22626216 | 685 | found = 1; |
29303547 VY |
686 | addr->valid = 0; |
687 | list_del_rcu(&addr->list); | |
29c7cf96 SS |
688 | break; |
689 | } | |
690 | } | |
29303547 | 691 | spin_unlock_bh(&sctp_local_addr_lock); |
22626216 | 692 | if (found) |
29303547 | 693 | call_rcu(&addr->rcu, sctp_local_addr_free); |
29c7cf96 SS |
694 | break; |
695 | } | |
1da177e4 LT |
696 | |
697 | return NOTIFY_DONE; | |
698 | } | |
699 | ||
700 | /* | |
701 | * Initialize the control inode/socket with a control endpoint data | |
702 | * structure. This endpoint is reserved exclusively for the OOTB processing. | |
703 | */ | |
704 | static int sctp_ctl_sock_init(void) | |
705 | { | |
706 | int err; | |
707 | sa_family_t family; | |
708 | ||
709 | if (sctp_get_pf_specific(PF_INET6)) | |
710 | family = PF_INET6; | |
711 | else | |
712 | family = PF_INET; | |
713 | ||
eee4fe4d | 714 | err = inet_ctl_sock_create(&sctp_ctl_sock, family, |
5677242f | 715 | SOCK_SEQPACKET, IPPROTO_SCTP, &init_net); |
1da177e4 LT |
716 | if (err < 0) { |
717 | printk(KERN_ERR | |
718 | "SCTP: Failed to create the SCTP control socket.\n"); | |
719 | return err; | |
720 | } | |
1da177e4 LT |
721 | return 0; |
722 | } | |
723 | ||
724 | /* Register address family specific functions. */ | |
725 | int sctp_register_af(struct sctp_af *af) | |
726 | { | |
727 | switch (af->sa_family) { | |
728 | case AF_INET: | |
729 | if (sctp_af_v4_specific) | |
730 | return 0; | |
731 | sctp_af_v4_specific = af; | |
732 | break; | |
733 | case AF_INET6: | |
734 | if (sctp_af_v6_specific) | |
735 | return 0; | |
736 | sctp_af_v6_specific = af; | |
737 | break; | |
738 | default: | |
739 | return 0; | |
740 | } | |
741 | ||
742 | INIT_LIST_HEAD(&af->list); | |
743 | list_add_tail(&af->list, &sctp_address_families); | |
744 | return 1; | |
745 | } | |
746 | ||
747 | /* Get the table of functions for manipulating a particular address | |
748 | * family. | |
749 | */ | |
750 | struct sctp_af *sctp_get_af_specific(sa_family_t family) | |
751 | { | |
752 | switch (family) { | |
753 | case AF_INET: | |
754 | return sctp_af_v4_specific; | |
755 | case AF_INET6: | |
756 | return sctp_af_v6_specific; | |
757 | default: | |
758 | return NULL; | |
759 | } | |
760 | } | |
761 | ||
762 | /* Common code to initialize a AF_INET msg_name. */ | |
763 | static void sctp_inet_msgname(char *msgname, int *addr_len) | |
764 | { | |
765 | struct sockaddr_in *sin; | |
766 | ||
767 | sin = (struct sockaddr_in *)msgname; | |
768 | *addr_len = sizeof(struct sockaddr_in); | |
769 | sin->sin_family = AF_INET; | |
770 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
771 | } | |
772 | ||
773 | /* Copy the primary address of the peer primary address as the msg_name. */ | |
774 | static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, | |
775 | int *addr_len) | |
776 | { | |
777 | struct sockaddr_in *sin, *sinfrom; | |
778 | ||
779 | if (msgname) { | |
780 | struct sctp_association *asoc; | |
781 | ||
782 | asoc = event->asoc; | |
783 | sctp_inet_msgname(msgname, addr_len); | |
784 | sin = (struct sockaddr_in *)msgname; | |
785 | sinfrom = &asoc->peer.primary_addr.v4; | |
786 | sin->sin_port = htons(asoc->peer.port); | |
787 | sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; | |
788 | } | |
789 | } | |
790 | ||
791 | /* Initialize and copy out a msgname from an inbound skb. */ | |
792 | static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) | |
793 | { | |
1da177e4 | 794 | if (msgname) { |
2c0fd387 ACM |
795 | struct sctphdr *sh = sctp_hdr(skb); |
796 | struct sockaddr_in *sin = (struct sockaddr_in *)msgname; | |
797 | ||
1da177e4 | 798 | sctp_inet_msgname(msgname, len); |
1da177e4 | 799 | sin->sin_port = sh->source; |
eddc9ec5 | 800 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
1da177e4 LT |
801 | } |
802 | } | |
803 | ||
804 | /* Do we support this AF? */ | |
805 | static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) | |
806 | { | |
807 | /* PF_INET only supports AF_INET addresses. */ | |
808 | return (AF_INET == family); | |
809 | } | |
810 | ||
811 | /* Address matching with wildcards allowed. */ | |
812 | static int sctp_inet_cmp_addr(const union sctp_addr *addr1, | |
813 | const union sctp_addr *addr2, | |
814 | struct sctp_sock *opt) | |
815 | { | |
816 | /* PF_INET only supports AF_INET addresses. */ | |
817 | if (addr1->sa.sa_family != addr2->sa.sa_family) | |
818 | return 0; | |
e6f1cebf AV |
819 | if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || |
820 | htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) | |
1da177e4 LT |
821 | return 1; |
822 | if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) | |
823 | return 1; | |
824 | ||
825 | return 0; | |
826 | } | |
827 | ||
828 | /* Verify that provided sockaddr looks bindable. Common verification has | |
829 | * already been taken care of. | |
830 | */ | |
831 | static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
832 | { | |
833 | return sctp_v4_available(addr, opt); | |
834 | } | |
835 | ||
836 | /* Verify that sockaddr looks sendable. Common verification has already | |
837 | * been taken care of. | |
838 | */ | |
839 | static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
840 | { | |
841 | return 1; | |
842 | } | |
843 | ||
844 | /* Fill in Supported Address Type information for INIT and INIT-ACK | |
845 | * chunks. Returns number of addresses supported. | |
846 | */ | |
847 | static int sctp_inet_supported_addrs(const struct sctp_sock *opt, | |
3dbe8656 | 848 | __be16 *types) |
1da177e4 LT |
849 | { |
850 | types[0] = SCTP_PARAM_IPV4_ADDRESS; | |
851 | return 1; | |
852 | } | |
853 | ||
854 | /* Wrapper routine that calls the ip transmit routine. */ | |
855 | static inline int sctp_v4_xmit(struct sk_buff *skb, | |
856 | struct sctp_transport *transport, int ipfragok) | |
857 | { | |
858 | SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, " | |
859 | "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n", | |
0dc47877 | 860 | __func__, skb, skb->len, |
ee6b9673 ED |
861 | NIPQUAD(skb->rtable->rt_src), |
862 | NIPQUAD(skb->rtable->rt_dst)); | |
1da177e4 LT |
863 | |
864 | SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); | |
e89862f4 | 865 | return ip_queue_xmit(skb, ipfragok); |
1da177e4 LT |
866 | } |
867 | ||
15efbe76 | 868 | static struct sctp_af sctp_af_inet; |
1da177e4 LT |
869 | |
870 | static struct sctp_pf sctp_pf_inet = { | |
871 | .event_msgname = sctp_inet_event_msgname, | |
872 | .skb_msgname = sctp_inet_skb_msgname, | |
873 | .af_supported = sctp_inet_af_supported, | |
874 | .cmp_addr = sctp_inet_cmp_addr, | |
875 | .bind_verify = sctp_inet_bind_verify, | |
876 | .send_verify = sctp_inet_send_verify, | |
877 | .supported_addrs = sctp_inet_supported_addrs, | |
878 | .create_accept_sk = sctp_v4_create_accept_sk, | |
879 | .addr_v4map = sctp_v4_addr_v4map, | |
15efbe76 | 880 | .af = &sctp_af_inet |
1da177e4 LT |
881 | }; |
882 | ||
883 | /* Notifier for inetaddr addition/deletion events. */ | |
884 | static struct notifier_block sctp_inetaddr_notifier = { | |
885 | .notifier_call = sctp_inetaddr_event, | |
886 | }; | |
887 | ||
888 | /* Socket operations. */ | |
90ddc4f0 | 889 | static const struct proto_ops inet_seqpacket_ops = { |
543d9cfe ACM |
890 | .family = PF_INET, |
891 | .owner = THIS_MODULE, | |
892 | .release = inet_release, /* Needs to be wrapped... */ | |
893 | .bind = inet_bind, | |
894 | .connect = inet_dgram_connect, | |
895 | .socketpair = sock_no_socketpair, | |
896 | .accept = inet_accept, | |
897 | .getname = inet_getname, /* Semantics are different. */ | |
898 | .poll = sctp_poll, | |
899 | .ioctl = inet_ioctl, | |
900 | .listen = sctp_inet_listen, | |
901 | .shutdown = inet_shutdown, /* Looks harmless. */ | |
902 | .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ | |
903 | .getsockopt = sock_common_getsockopt, | |
904 | .sendmsg = inet_sendmsg, | |
905 | .recvmsg = sock_common_recvmsg, | |
906 | .mmap = sock_no_mmap, | |
907 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 908 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
909 | .compat_setsockopt = compat_sock_common_setsockopt, |
910 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 911 | #endif |
1da177e4 LT |
912 | }; |
913 | ||
914 | /* Registration with AF_INET family. */ | |
915 | static struct inet_protosw sctp_seqpacket_protosw = { | |
916 | .type = SOCK_SEQPACKET, | |
917 | .protocol = IPPROTO_SCTP, | |
918 | .prot = &sctp_prot, | |
919 | .ops = &inet_seqpacket_ops, | |
920 | .capability = -1, | |
921 | .no_check = 0, | |
922 | .flags = SCTP_PROTOSW_FLAG | |
923 | }; | |
924 | static struct inet_protosw sctp_stream_protosw = { | |
925 | .type = SOCK_STREAM, | |
926 | .protocol = IPPROTO_SCTP, | |
927 | .prot = &sctp_prot, | |
928 | .ops = &inet_seqpacket_ops, | |
929 | .capability = -1, | |
930 | .no_check = 0, | |
931 | .flags = SCTP_PROTOSW_FLAG | |
932 | }; | |
933 | ||
934 | /* Register with IP layer. */ | |
935 | static struct net_protocol sctp_protocol = { | |
936 | .handler = sctp_rcv, | |
937 | .err_handler = sctp_v4_err, | |
938 | .no_policy = 1, | |
939 | }; | |
940 | ||
941 | /* IPv4 address related functions. */ | |
15efbe76 | 942 | static struct sctp_af sctp_af_inet = { |
543d9cfe ACM |
943 | .sa_family = AF_INET, |
944 | .sctp_xmit = sctp_v4_xmit, | |
945 | .setsockopt = ip_setsockopt, | |
946 | .getsockopt = ip_getsockopt, | |
947 | .get_dst = sctp_v4_get_dst, | |
948 | .get_saddr = sctp_v4_get_saddr, | |
949 | .copy_addrlist = sctp_v4_copy_addrlist, | |
950 | .from_skb = sctp_v4_from_skb, | |
951 | .from_sk = sctp_v4_from_sk, | |
952 | .to_sk_saddr = sctp_v4_to_sk_saddr, | |
953 | .to_sk_daddr = sctp_v4_to_sk_daddr, | |
954 | .from_addr_param = sctp_v4_from_addr_param, | |
955 | .to_addr_param = sctp_v4_to_addr_param, | |
956 | .dst_saddr = sctp_v4_dst_saddr, | |
957 | .cmp_addr = sctp_v4_cmp_addr, | |
958 | .addr_valid = sctp_v4_addr_valid, | |
959 | .inaddr_any = sctp_v4_inaddr_any, | |
960 | .is_any = sctp_v4_is_any, | |
961 | .available = sctp_v4_available, | |
962 | .scope = sctp_v4_scope, | |
963 | .skb_iif = sctp_v4_skb_iif, | |
964 | .is_ce = sctp_v4_is_ce, | |
965 | .seq_dump_addr = sctp_v4_seq_dump_addr, | |
b9031d9d | 966 | .ecn_capable = sctp_v4_ecn_capable, |
543d9cfe ACM |
967 | .net_header_len = sizeof(struct iphdr), |
968 | .sockaddr_len = sizeof(struct sockaddr_in), | |
3fdadf7d | 969 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
970 | .compat_setsockopt = compat_ip_setsockopt, |
971 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 972 | #endif |
1da177e4 LT |
973 | }; |
974 | ||
975 | struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { | |
976 | ||
977 | switch (family) { | |
978 | case PF_INET: | |
979 | return sctp_pf_inet_specific; | |
980 | case PF_INET6: | |
981 | return sctp_pf_inet6_specific; | |
982 | default: | |
983 | return NULL; | |
984 | } | |
985 | } | |
986 | ||
987 | /* Register the PF specific function table. */ | |
988 | int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) | |
989 | { | |
990 | switch (family) { | |
991 | case PF_INET: | |
992 | if (sctp_pf_inet_specific) | |
993 | return 0; | |
994 | sctp_pf_inet_specific = pf; | |
995 | break; | |
996 | case PF_INET6: | |
997 | if (sctp_pf_inet6_specific) | |
998 | return 0; | |
999 | sctp_pf_inet6_specific = pf; | |
1000 | break; | |
1001 | default: | |
1002 | return 0; | |
1003 | } | |
1004 | return 1; | |
1005 | } | |
1006 | ||
996b1dba YH |
1007 | static inline int init_sctp_mibs(void) |
1008 | { | |
1009 | return snmp_mib_init((void**)sctp_statistics, sizeof(struct sctp_mib)); | |
1da177e4 LT |
1010 | } |
1011 | ||
996b1dba | 1012 | static inline void cleanup_sctp_mibs(void) |
1da177e4 | 1013 | { |
996b1dba | 1014 | snmp_mib_free((void**)sctp_statistics); |
1da177e4 LT |
1015 | } |
1016 | ||
270637ab VY |
1017 | static void sctp_v4_pf_init(void) |
1018 | { | |
1019 | /* Initialize the SCTP specific PF functions. */ | |
1020 | sctp_register_pf(&sctp_pf_inet, PF_INET); | |
1021 | sctp_register_af(&sctp_af_inet); | |
1022 | } | |
1023 | ||
1024 | static void sctp_v4_pf_exit(void) | |
1025 | { | |
1026 | list_del(&sctp_af_inet.list); | |
1027 | } | |
1028 | ||
1029 | static int sctp_v4_protosw_init(void) | |
1030 | { | |
1031 | int rc; | |
1032 | ||
1033 | rc = proto_register(&sctp_prot, 1); | |
1034 | if (rc) | |
1035 | return rc; | |
1036 | ||
1037 | /* Register SCTP(UDP and TCP style) with socket layer. */ | |
1038 | inet_register_protosw(&sctp_seqpacket_protosw); | |
1039 | inet_register_protosw(&sctp_stream_protosw); | |
1040 | ||
1041 | return 0; | |
1042 | } | |
1043 | ||
1044 | static void sctp_v4_protosw_exit(void) | |
1045 | { | |
1046 | inet_unregister_protosw(&sctp_stream_protosw); | |
1047 | inet_unregister_protosw(&sctp_seqpacket_protosw); | |
1048 | proto_unregister(&sctp_prot); | |
1049 | } | |
1050 | ||
1051 | static int sctp_v4_add_protocol(void) | |
1052 | { | |
1053 | /* Register notifier for inet address additions/deletions. */ | |
1054 | register_inetaddr_notifier(&sctp_inetaddr_notifier); | |
1055 | ||
1056 | /* Register SCTP with inet layer. */ | |
1057 | if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) | |
1058 | return -EAGAIN; | |
1059 | ||
1060 | return 0; | |
1061 | } | |
1062 | ||
1063 | static void sctp_v4_del_protocol(void) | |
1064 | { | |
1065 | inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); | |
1066 | unregister_inetaddr_notifier(&sctp_inetaddr_notifier); | |
1067 | } | |
1068 | ||
1da177e4 LT |
1069 | /* Initialize the universe into something sensible. */ |
1070 | SCTP_STATIC __init int sctp_init(void) | |
1071 | { | |
1072 | int i; | |
1073 | int status = -EINVAL; | |
1074 | unsigned long goal; | |
4d93df0a NH |
1075 | unsigned long limit; |
1076 | int max_share; | |
1da177e4 LT |
1077 | int order; |
1078 | ||
1079 | /* SCTP_DEBUG sanity check. */ | |
1080 | if (!sctp_sanity_check()) | |
1081 | goto out; | |
1082 | ||
827bf122 | 1083 | /* Allocate bind_bucket and chunk caches. */ |
1da177e4 LT |
1084 | status = -ENOBUFS; |
1085 | sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", | |
1086 | sizeof(struct sctp_bind_bucket), | |
1087 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1088 | NULL); |
1da177e4 | 1089 | if (!sctp_bucket_cachep) |
827bf122 | 1090 | goto out; |
1da177e4 LT |
1091 | |
1092 | sctp_chunk_cachep = kmem_cache_create("sctp_chunk", | |
1093 | sizeof(struct sctp_chunk), | |
1094 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1095 | NULL); |
1da177e4 LT |
1096 | if (!sctp_chunk_cachep) |
1097 | goto err_chunk_cachep; | |
1098 | ||
1099 | /* Allocate and initialise sctp mibs. */ | |
1100 | status = init_sctp_mibs(); | |
1101 | if (status) | |
1102 | goto err_init_mibs; | |
1103 | ||
1104 | /* Initialize proc fs directory. */ | |
1105 | status = sctp_proc_init(); | |
1106 | if (status) | |
1107 | goto err_init_proc; | |
1108 | ||
1109 | /* Initialize object count debugging. */ | |
1110 | sctp_dbg_objcnt_init(); | |
1111 | ||
1da177e4 LT |
1112 | /* |
1113 | * 14. Suggested SCTP Protocol Parameter Values | |
1114 | */ | |
1115 | /* The following protocol parameters are RECOMMENDED: */ | |
1116 | /* RTO.Initial - 3 seconds */ | |
1117 | sctp_rto_initial = SCTP_RTO_INITIAL; | |
1118 | /* RTO.Min - 1 second */ | |
1119 | sctp_rto_min = SCTP_RTO_MIN; | |
1120 | /* RTO.Max - 60 seconds */ | |
1121 | sctp_rto_max = SCTP_RTO_MAX; | |
1122 | /* RTO.Alpha - 1/8 */ | |
1123 | sctp_rto_alpha = SCTP_RTO_ALPHA; | |
1124 | /* RTO.Beta - 1/4 */ | |
1125 | sctp_rto_beta = SCTP_RTO_BETA; | |
1126 | ||
1127 | /* Valid.Cookie.Life - 60 seconds */ | |
3fd091e7 | 1128 | sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; |
1da177e4 LT |
1129 | |
1130 | /* Whether Cookie Preservative is enabled(1) or not(0) */ | |
1131 | sctp_cookie_preserve_enable = 1; | |
1132 | ||
1133 | /* Max.Burst - 4 */ | |
70331571 | 1134 | sctp_max_burst = SCTP_DEFAULT_MAX_BURST; |
1da177e4 LT |
1135 | |
1136 | /* Association.Max.Retrans - 10 attempts | |
1137 | * Path.Max.Retrans - 5 attempts (per destination address) | |
1138 | * Max.Init.Retransmits - 8 attempts | |
1139 | */ | |
1140 | sctp_max_retrans_association = 10; | |
1141 | sctp_max_retrans_path = 5; | |
1142 | sctp_max_retrans_init = 8; | |
1143 | ||
4eb701df NH |
1144 | /* Sendbuffer growth - do per-socket accounting */ |
1145 | sctp_sndbuf_policy = 0; | |
1146 | ||
049b3ff5 NH |
1147 | /* Rcvbuffer growth - do per-socket accounting */ |
1148 | sctp_rcvbuf_policy = 0; | |
1149 | ||
1da177e4 | 1150 | /* HB.interval - 30 seconds */ |
2f85a429 VY |
1151 | sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; |
1152 | ||
1153 | /* delayed SACK timeout */ | |
1154 | sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; | |
1da177e4 LT |
1155 | |
1156 | /* Implementation specific variables. */ | |
1157 | ||
1158 | /* Initialize default stream count setup information. */ | |
1159 | sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; | |
1160 | sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; | |
1161 | ||
1162 | /* Initialize handle used for association ids. */ | |
1163 | idr_init(&sctp_assocs_id); | |
1164 | ||
4d93df0a NH |
1165 | /* Set the pressure threshold to be a fraction of global memory that |
1166 | * is up to 1/2 at 256 MB, decreasing toward zero with the amount of | |
1167 | * memory, with a floor of 128 pages. | |
1168 | * Note this initalizes the data in sctpv6_prot too | |
1169 | * Unabashedly stolen from tcp_init | |
1170 | */ | |
1171 | limit = min(num_physpages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); | |
1172 | limit = (limit * (num_physpages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); | |
1173 | limit = max(limit, 128UL); | |
1174 | sysctl_sctp_mem[0] = limit / 4 * 3; | |
1175 | sysctl_sctp_mem[1] = limit; | |
1176 | sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; | |
1177 | ||
1178 | /* Set per-socket limits to no more than 1/128 the pressure threshold*/ | |
1179 | limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); | |
1180 | max_share = min(4UL*1024*1024, limit); | |
1181 | ||
1182 | sysctl_sctp_rmem[0] = PAGE_SIZE; /* give each asoc 1 page min */ | |
1183 | sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1)); | |
1184 | sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); | |
1185 | ||
3ab224be | 1186 | sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; |
4d93df0a NH |
1187 | sysctl_sctp_wmem[1] = 16*1024; |
1188 | sysctl_sctp_wmem[2] = max(64*1024, max_share); | |
1189 | ||
1da177e4 LT |
1190 | /* Size and allocate the association hash table. |
1191 | * The methodology is similar to that of the tcp hash tables. | |
1192 | */ | |
1193 | if (num_physpages >= (128 * 1024)) | |
1194 | goal = num_physpages >> (22 - PAGE_SHIFT); | |
1195 | else | |
1196 | goal = num_physpages >> (24 - PAGE_SHIFT); | |
1197 | ||
1198 | for (order = 0; (1UL << order) < goal; order++) | |
1199 | ; | |
1200 | ||
1201 | do { | |
1202 | sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / | |
1203 | sizeof(struct sctp_hashbucket); | |
1204 | if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) | |
1205 | continue; | |
1206 | sctp_assoc_hashtable = (struct sctp_hashbucket *) | |
1207 | __get_free_pages(GFP_ATOMIC, order); | |
1208 | } while (!sctp_assoc_hashtable && --order > 0); | |
1209 | if (!sctp_assoc_hashtable) { | |
1210 | printk(KERN_ERR "SCTP: Failed association hash alloc.\n"); | |
1211 | status = -ENOMEM; | |
1212 | goto err_ahash_alloc; | |
1213 | } | |
1214 | for (i = 0; i < sctp_assoc_hashsize; i++) { | |
1215 | rwlock_init(&sctp_assoc_hashtable[i].lock); | |
d970dbf8 | 1216 | INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); |
1da177e4 LT |
1217 | } |
1218 | ||
1219 | /* Allocate and initialize the endpoint hash table. */ | |
1220 | sctp_ep_hashsize = 64; | |
1221 | sctp_ep_hashtable = (struct sctp_hashbucket *) | |
1222 | kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); | |
1223 | if (!sctp_ep_hashtable) { | |
1224 | printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n"); | |
1225 | status = -ENOMEM; | |
1226 | goto err_ehash_alloc; | |
1227 | } | |
1228 | for (i = 0; i < sctp_ep_hashsize; i++) { | |
1229 | rwlock_init(&sctp_ep_hashtable[i].lock); | |
d970dbf8 | 1230 | INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); |
1da177e4 LT |
1231 | } |
1232 | ||
1233 | /* Allocate and initialize the SCTP port hash table. */ | |
1234 | do { | |
1235 | sctp_port_hashsize = (1UL << order) * PAGE_SIZE / | |
1236 | sizeof(struct sctp_bind_hashbucket); | |
1237 | if ((sctp_port_hashsize > (64 * 1024)) && order > 0) | |
1238 | continue; | |
1239 | sctp_port_hashtable = (struct sctp_bind_hashbucket *) | |
1240 | __get_free_pages(GFP_ATOMIC, order); | |
1241 | } while (!sctp_port_hashtable && --order > 0); | |
1242 | if (!sctp_port_hashtable) { | |
1243 | printk(KERN_ERR "SCTP: Failed bind hash alloc."); | |
1244 | status = -ENOMEM; | |
1245 | goto err_bhash_alloc; | |
1246 | } | |
1247 | for (i = 0; i < sctp_port_hashsize; i++) { | |
1248 | spin_lock_init(&sctp_port_hashtable[i].lock); | |
d970dbf8 | 1249 | INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); |
1da177e4 LT |
1250 | } |
1251 | ||
1da177e4 LT |
1252 | printk(KERN_INFO "SCTP: Hash tables configured " |
1253 | "(established %d bind %d)\n", | |
1254 | sctp_assoc_hashsize, sctp_port_hashsize); | |
1255 | ||
1256 | /* Disable ADDIP by default. */ | |
1257 | sctp_addip_enable = 0; | |
73d9c4fd | 1258 | sctp_addip_noauth = 0; |
1da177e4 LT |
1259 | |
1260 | /* Enable PR-SCTP by default. */ | |
1261 | sctp_prsctp_enable = 1; | |
1262 | ||
a29a5bd4 VY |
1263 | /* Disable AUTH by default. */ |
1264 | sctp_auth_enable = 0; | |
1265 | ||
1da177e4 LT |
1266 | sctp_sysctl_register(); |
1267 | ||
1268 | INIT_LIST_HEAD(&sctp_address_families); | |
270637ab VY |
1269 | sctp_v4_pf_init(); |
1270 | sctp_v6_pf_init(); | |
1da177e4 | 1271 | |
270637ab VY |
1272 | /* Initialize the local address list. */ |
1273 | INIT_LIST_HEAD(&sctp_local_addr_list); | |
1274 | spin_lock_init(&sctp_local_addr_lock); | |
1275 | sctp_get_local_addr_list(); | |
827bf122 | 1276 | |
270637ab | 1277 | status = sctp_v4_protosw_init(); |
827bf122 | 1278 | |
1da177e4 | 1279 | if (status) |
270637ab VY |
1280 | goto err_protosw_init; |
1281 | ||
1282 | status = sctp_v6_protosw_init(); | |
1283 | if (status) | |
1284 | goto err_v6_protosw_init; | |
1da177e4 LT |
1285 | |
1286 | /* Initialize the control inode/socket for handling OOTB packets. */ | |
1287 | if ((status = sctp_ctl_sock_init())) { | |
1288 | printk (KERN_ERR | |
1289 | "SCTP: Failed to initialize the SCTP control sock.\n"); | |
1290 | goto err_ctl_sock_init; | |
1291 | } | |
1292 | ||
270637ab VY |
1293 | status = sctp_v4_add_protocol(); |
1294 | if (status) | |
827bf122 | 1295 | goto err_add_protocol; |
827bf122 SS |
1296 | |
1297 | /* Register SCTP with inet6 layer. */ | |
1298 | status = sctp_v6_add_protocol(); | |
1299 | if (status) | |
1300 | goto err_v6_add_protocol; | |
1301 | ||
1da177e4 LT |
1302 | status = 0; |
1303 | out: | |
1304 | return status; | |
827bf122 | 1305 | err_v6_add_protocol: |
270637ab | 1306 | sctp_v6_del_protocol(); |
827bf122 | 1307 | err_add_protocol: |
270637ab | 1308 | sctp_v4_del_protocol(); |
5677242f | 1309 | inet_ctl_sock_destroy(sctp_ctl_sock); |
1da177e4 | 1310 | err_ctl_sock_init: |
270637ab VY |
1311 | sctp_v6_protosw_exit(); |
1312 | err_v6_protosw_init: | |
1313 | sctp_v4_protosw_exit(); | |
1314 | err_protosw_init: | |
1315 | sctp_free_local_addr_list(); | |
1316 | sctp_v4_pf_exit(); | |
1317 | sctp_v6_pf_exit(); | |
1da177e4 | 1318 | sctp_sysctl_unregister(); |
15efbe76 | 1319 | list_del(&sctp_af_inet.list); |
1da177e4 LT |
1320 | free_pages((unsigned long)sctp_port_hashtable, |
1321 | get_order(sctp_port_hashsize * | |
1322 | sizeof(struct sctp_bind_hashbucket))); | |
1323 | err_bhash_alloc: | |
1324 | kfree(sctp_ep_hashtable); | |
1325 | err_ehash_alloc: | |
1326 | free_pages((unsigned long)sctp_assoc_hashtable, | |
1327 | get_order(sctp_assoc_hashsize * | |
1328 | sizeof(struct sctp_hashbucket))); | |
1329 | err_ahash_alloc: | |
1330 | sctp_dbg_objcnt_exit(); | |
1da177e4 | 1331 | sctp_proc_exit(); |
827bf122 | 1332 | err_init_proc: |
1da177e4 LT |
1333 | cleanup_sctp_mibs(); |
1334 | err_init_mibs: | |
1335 | kmem_cache_destroy(sctp_chunk_cachep); | |
1336 | err_chunk_cachep: | |
1337 | kmem_cache_destroy(sctp_bucket_cachep); | |
1da177e4 LT |
1338 | goto out; |
1339 | } | |
1340 | ||
1341 | /* Exit handler for the SCTP protocol. */ | |
1342 | SCTP_STATIC __exit void sctp_exit(void) | |
1343 | { | |
1344 | /* BUG. This should probably do something useful like clean | |
1345 | * up all the remaining associations and all that memory. | |
1346 | */ | |
1347 | ||
827bf122 SS |
1348 | /* Unregister with inet6/inet layers. */ |
1349 | sctp_v6_del_protocol(); | |
270637ab | 1350 | sctp_v4_del_protocol(); |
1da177e4 LT |
1351 | |
1352 | /* Free the control endpoint. */ | |
5677242f | 1353 | inet_ctl_sock_destroy(sctp_ctl_sock); |
1da177e4 | 1354 | |
270637ab VY |
1355 | /* Free protosw registrations */ |
1356 | sctp_v6_protosw_exit(); | |
1357 | sctp_v4_protosw_exit(); | |
1358 | ||
1359 | /* Free the local address list. */ | |
1360 | sctp_free_local_addr_list(); | |
827bf122 SS |
1361 | |
1362 | /* Unregister with socket layer. */ | |
270637ab VY |
1363 | sctp_v6_pf_exit(); |
1364 | sctp_v4_pf_exit(); | |
827bf122 | 1365 | |
1da177e4 | 1366 | sctp_sysctl_unregister(); |
15efbe76 | 1367 | list_del(&sctp_af_inet.list); |
1da177e4 LT |
1368 | |
1369 | free_pages((unsigned long)sctp_assoc_hashtable, | |
1370 | get_order(sctp_assoc_hashsize * | |
1371 | sizeof(struct sctp_hashbucket))); | |
1372 | kfree(sctp_ep_hashtable); | |
1373 | free_pages((unsigned long)sctp_port_hashtable, | |
1374 | get_order(sctp_port_hashsize * | |
1375 | sizeof(struct sctp_bind_hashbucket))); | |
1376 | ||
1da177e4 LT |
1377 | sctp_dbg_objcnt_exit(); |
1378 | sctp_proc_exit(); | |
1379 | cleanup_sctp_mibs(); | |
1380 | ||
827bf122 SS |
1381 | kmem_cache_destroy(sctp_chunk_cachep); |
1382 | kmem_cache_destroy(sctp_bucket_cachep); | |
1da177e4 LT |
1383 | } |
1384 | ||
1385 | module_init(sctp_init); | |
1386 | module_exit(sctp_exit); | |
1387 | ||
bb97d31f ACM |
1388 | /* |
1389 | * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. | |
1390 | */ | |
1391 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); | |
882a382c | 1392 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); |
1da177e4 LT |
1393 | MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); |
1394 | MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); | |
1395 | MODULE_LICENSE("GPL"); |