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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 | |
4b2f13a2 JK |
26 | * along with GNU CC; see the file COPYING. If not, see |
27 | * <http://www.gnu.org/licenses/>. | |
1da177e4 LT |
28 | * |
29 | * Please send any bug reports or fixes you make to the | |
30 | * email address(es): | |
91705c61 | 31 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 32 | * |
1da177e4 LT |
33 | * Written or modified by: |
34 | * La Monte H.P. Yarroll <piggy@acm.org> | |
35 | * Karl Knutson <karl@athena.chicago.il.us> | |
36 | * Jon Grimm <jgrimm@us.ibm.com> | |
37 | * Sridhar Samudrala <sri@us.ibm.com> | |
38 | * Daisy Chang <daisyc@us.ibm.com> | |
39 | * Ardelle Fan <ardelle.fan@intel.com> | |
1da177e4 LT |
40 | */ |
41 | ||
145ce502 JP |
42 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
43 | ||
1da177e4 LT |
44 | #include <linux/module.h> |
45 | #include <linux/init.h> | |
46 | #include <linux/netdevice.h> | |
47 | #include <linux/inetdevice.h> | |
48 | #include <linux/seq_file.h> | |
4d93df0a | 49 | #include <linux/bootmem.h> |
845525a6 VY |
50 | #include <linux/highmem.h> |
51 | #include <linux/swap.h> | |
5a0e3ad6 | 52 | #include <linux/slab.h> |
457c4cbc | 53 | #include <net/net_namespace.h> |
1da177e4 LT |
54 | #include <net/protocol.h> |
55 | #include <net/ip.h> | |
56 | #include <net/ipv6.h> | |
14c85021 | 57 | #include <net/route.h> |
1da177e4 LT |
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. */ | |
4cbf1cae | 64 | struct sctp_globals sctp_globals __read_mostly; |
1da177e4 LT |
65 | |
66 | struct idr sctp_assocs_id; | |
67 | DEFINE_SPINLOCK(sctp_assocs_id_lock); | |
68 | ||
1da177e4 LT |
69 | static struct sctp_pf *sctp_pf_inet6_specific; |
70 | static struct sctp_pf *sctp_pf_inet_specific; | |
71 | static struct sctp_af *sctp_af_v4_specific; | |
72 | static struct sctp_af *sctp_af_v6_specific; | |
73 | ||
e18b890b CL |
74 | struct kmem_cache *sctp_chunk_cachep __read_mostly; |
75 | struct kmem_cache *sctp_bucket_cachep __read_mostly; | |
1da177e4 | 76 | |
8d987e5c | 77 | long sysctl_sctp_mem[3]; |
007e3936 VY |
78 | int sysctl_sctp_rmem[3]; |
79 | int sysctl_sctp_wmem[3]; | |
4d93df0a | 80 | |
1da177e4 | 81 | /* Set up the proc fs entry for the SCTP protocol. */ |
f5f417c0 | 82 | static int __net_init sctp_proc_init(struct net *net) |
1da177e4 | 83 | { |
c4e85f82 | 84 | #ifdef CONFIG_PROC_FS |
13d782f6 EB |
85 | net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net); |
86 | if (!net->sctp.proc_net_sctp) | |
87 | goto out_proc_net_sctp; | |
88 | if (sctp_snmp_proc_init(net)) | |
80896a35 | 89 | goto out_snmp_proc_init; |
13d782f6 | 90 | if (sctp_eps_proc_init(net)) |
80896a35 | 91 | goto out_eps_proc_init; |
13d782f6 | 92 | if (sctp_assocs_proc_init(net)) |
80896a35 | 93 | goto out_assocs_proc_init; |
13d782f6 | 94 | if (sctp_remaddr_proc_init(net)) |
caea902f | 95 | goto out_remaddr_proc_init; |
1da177e4 LT |
96 | |
97 | return 0; | |
98 | ||
caea902f | 99 | out_remaddr_proc_init: |
13d782f6 | 100 | sctp_assocs_proc_exit(net); |
80896a35 | 101 | out_assocs_proc_init: |
13d782f6 | 102 | sctp_eps_proc_exit(net); |
80896a35 | 103 | out_eps_proc_init: |
13d782f6 | 104 | sctp_snmp_proc_exit(net); |
80896a35 | 105 | out_snmp_proc_init: |
13d782f6 EB |
106 | remove_proc_entry("sctp", net->proc_net); |
107 | net->sctp.proc_net_sctp = NULL; | |
108 | out_proc_net_sctp: | |
157653ce | 109 | return -ENOMEM; |
13d782f6 EB |
110 | #endif /* CONFIG_PROC_FS */ |
111 | return 0; | |
1da177e4 LT |
112 | } |
113 | ||
d808ad9a | 114 | /* Clean up the proc fs entry for the SCTP protocol. |
1da177e4 LT |
115 | * Note: Do not make this __exit as it is used in the init error |
116 | * path. | |
117 | */ | |
13d782f6 | 118 | static void sctp_proc_exit(struct net *net) |
1da177e4 | 119 | { |
c4e85f82 | 120 | #ifdef CONFIG_PROC_FS |
13d782f6 EB |
121 | sctp_snmp_proc_exit(net); |
122 | sctp_eps_proc_exit(net); | |
123 | sctp_assocs_proc_exit(net); | |
124 | sctp_remaddr_proc_exit(net); | |
125 | ||
126 | remove_proc_entry("sctp", net->proc_net); | |
127 | net->sctp.proc_net_sctp = NULL; | |
c4e85f82 | 128 | #endif |
1da177e4 LT |
129 | } |
130 | ||
131 | /* Private helper to extract ipv4 address and stash them in | |
132 | * the protocol structure. | |
133 | */ | |
134 | static void sctp_v4_copy_addrlist(struct list_head *addrlist, | |
135 | struct net_device *dev) | |
136 | { | |
137 | struct in_device *in_dev; | |
138 | struct in_ifaddr *ifa; | |
139 | struct sctp_sockaddr_entry *addr; | |
140 | ||
141 | rcu_read_lock(); | |
e5ed6399 | 142 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { |
1da177e4 LT |
143 | rcu_read_unlock(); |
144 | return; | |
145 | } | |
146 | ||
147 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { | |
148 | /* Add the address to the local list. */ | |
939cfa75 | 149 | addr = kzalloc(sizeof(*addr), GFP_ATOMIC); |
1da177e4 | 150 | if (addr) { |
2a6fd78a AV |
151 | addr->a.v4.sin_family = AF_INET; |
152 | addr->a.v4.sin_port = 0; | |
153 | addr->a.v4.sin_addr.s_addr = ifa->ifa_local; | |
29303547 VY |
154 | addr->valid = 1; |
155 | INIT_LIST_HEAD(&addr->list); | |
1da177e4 LT |
156 | list_add_tail(&addr->list, addrlist); |
157 | } | |
158 | } | |
159 | ||
160 | rcu_read_unlock(); | |
161 | } | |
162 | ||
163 | /* Extract our IP addresses from the system and stash them in the | |
164 | * protocol structure. | |
165 | */ | |
4db67e80 | 166 | static void sctp_get_local_addr_list(struct net *net) |
1da177e4 LT |
167 | { |
168 | struct net_device *dev; | |
169 | struct list_head *pos; | |
170 | struct sctp_af *af; | |
171 | ||
c6d14c84 | 172 | rcu_read_lock(); |
4db67e80 | 173 | for_each_netdev_rcu(net, dev) { |
2c0740e4 | 174 | list_for_each(pos, &sctp_address_families) { |
1da177e4 | 175 | af = list_entry(pos, struct sctp_af, list); |
4db67e80 | 176 | af->copy_addrlist(&net->sctp.local_addr_list, dev); |
1da177e4 LT |
177 | } |
178 | } | |
c6d14c84 | 179 | rcu_read_unlock(); |
1da177e4 LT |
180 | } |
181 | ||
1da177e4 | 182 | /* Free the existing local addresses. */ |
4db67e80 | 183 | static void sctp_free_local_addr_list(struct net *net) |
1da177e4 LT |
184 | { |
185 | struct sctp_sockaddr_entry *addr; | |
186 | struct list_head *pos, *temp; | |
187 | ||
4db67e80 | 188 | list_for_each_safe(pos, temp, &net->sctp.local_addr_list) { |
1da177e4 LT |
189 | addr = list_entry(pos, struct sctp_sockaddr_entry, list); |
190 | list_del(pos); | |
191 | kfree(addr); | |
192 | } | |
193 | } | |
194 | ||
1da177e4 | 195 | /* Copy the local addresses which are valid for 'scope' into 'bp'. */ |
4db67e80 EB |
196 | int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp, |
197 | sctp_scope_t scope, gfp_t gfp, int copy_flags) | |
1da177e4 LT |
198 | { |
199 | struct sctp_sockaddr_entry *addr; | |
200 | int error = 0; | |
1da177e4 | 201 | |
29303547 | 202 | rcu_read_lock(); |
4db67e80 | 203 | list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) { |
29303547 VY |
204 | if (!addr->valid) |
205 | continue; | |
e7ff4a70 | 206 | if (sctp_in_scope(net, &addr->a, scope)) { |
1da177e4 LT |
207 | /* Now that the address is in scope, check to see if |
208 | * the address type is really supported by the local | |
209 | * sock as well as the remote peer. | |
210 | */ | |
6244be4e | 211 | if ((((AF_INET == addr->a.sa.sa_family) && |
1da177e4 | 212 | (copy_flags & SCTP_ADDR4_PEERSUPP))) || |
6244be4e | 213 | (((AF_INET6 == addr->a.sa.sa_family) && |
1da177e4 LT |
214 | (copy_flags & SCTP_ADDR6_ALLOWED) && |
215 | (copy_flags & SCTP_ADDR6_PEERSUPP)))) { | |
f57d96b2 VY |
216 | error = sctp_add_bind_addr(bp, &addr->a, |
217 | SCTP_ADDR_SRC, GFP_ATOMIC); | |
1da177e4 LT |
218 | if (error) |
219 | goto end_copy; | |
220 | } | |
221 | } | |
222 | } | |
223 | ||
224 | end_copy: | |
29303547 | 225 | rcu_read_unlock(); |
1da177e4 LT |
226 | return error; |
227 | } | |
228 | ||
229 | /* Initialize a sctp_addr from in incoming skb. */ | |
230 | static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, | |
231 | int is_saddr) | |
232 | { | |
233 | void *from; | |
d55c41b1 | 234 | __be16 *port; |
1da177e4 LT |
235 | struct sctphdr *sh; |
236 | ||
237 | port = &addr->v4.sin_port; | |
238 | addr->v4.sin_family = AF_INET; | |
239 | ||
2c0fd387 | 240 | sh = sctp_hdr(skb); |
1da177e4 | 241 | if (is_saddr) { |
d55c41b1 | 242 | *port = sh->source; |
eddc9ec5 | 243 | from = &ip_hdr(skb)->saddr; |
1da177e4 | 244 | } else { |
d55c41b1 | 245 | *port = sh->dest; |
eddc9ec5 | 246 | from = &ip_hdr(skb)->daddr; |
1da177e4 LT |
247 | } |
248 | memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); | |
249 | } | |
250 | ||
251 | /* Initialize an sctp_addr from a socket. */ | |
252 | static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) | |
253 | { | |
254 | addr->v4.sin_family = AF_INET; | |
7dcdbd95 | 255 | addr->v4.sin_port = 0; |
c720c7e8 | 256 | addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr; |
1da177e4 LT |
257 | } |
258 | ||
259 | /* Initialize sk->sk_rcv_saddr from sctp_addr. */ | |
260 | static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) | |
261 | { | |
c720c7e8 | 262 | inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr; |
1da177e4 LT |
263 | } |
264 | ||
265 | /* Initialize sk->sk_daddr from sctp_addr. */ | |
266 | static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) | |
267 | { | |
c720c7e8 | 268 | inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr; |
1da177e4 LT |
269 | } |
270 | ||
271 | /* Initialize a sctp_addr from an address parameter. */ | |
272 | static void sctp_v4_from_addr_param(union sctp_addr *addr, | |
273 | union sctp_addr_param *param, | |
dd86d136 | 274 | __be16 port, int iif) |
1da177e4 LT |
275 | { |
276 | addr->v4.sin_family = AF_INET; | |
277 | addr->v4.sin_port = port; | |
278 | addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; | |
279 | } | |
280 | ||
281 | /* Initialize an address parameter from a sctp_addr and return the length | |
282 | * of the address parameter. | |
283 | */ | |
284 | static int sctp_v4_to_addr_param(const union sctp_addr *addr, | |
285 | union sctp_addr_param *param) | |
286 | { | |
287 | int length = sizeof(sctp_ipv4addr_param_t); | |
288 | ||
289 | param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; | |
dbc16db1 | 290 | param->v4.param_hdr.length = htons(length); |
d808ad9a | 291 | param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; |
1da177e4 LT |
292 | |
293 | return length; | |
294 | } | |
295 | ||
296 | /* Initialize a sctp_addr from a dst_entry. */ | |
18a353f4 | 297 | static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4, |
854d43a4 | 298 | __be16 port) |
1da177e4 | 299 | { |
1da177e4 LT |
300 | saddr->v4.sin_family = AF_INET; |
301 | saddr->v4.sin_port = port; | |
18a353f4 | 302 | saddr->v4.sin_addr.s_addr = fl4->saddr; |
1da177e4 LT |
303 | } |
304 | ||
305 | /* Compare two addresses exactly. */ | |
306 | static int sctp_v4_cmp_addr(const union sctp_addr *addr1, | |
307 | const union sctp_addr *addr2) | |
308 | { | |
309 | if (addr1->sa.sa_family != addr2->sa.sa_family) | |
310 | return 0; | |
311 | if (addr1->v4.sin_port != addr2->v4.sin_port) | |
312 | return 0; | |
313 | if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) | |
314 | return 0; | |
315 | ||
316 | return 1; | |
317 | } | |
318 | ||
319 | /* Initialize addr struct to INADDR_ANY. */ | |
6fbfa9f9 | 320 | static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) |
1da177e4 LT |
321 | { |
322 | addr->v4.sin_family = AF_INET; | |
e6f1cebf | 323 | addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); |
1da177e4 LT |
324 | addr->v4.sin_port = port; |
325 | } | |
326 | ||
327 | /* Is this a wildcard address? */ | |
328 | static int sctp_v4_is_any(const union sctp_addr *addr) | |
329 | { | |
e6f1cebf | 330 | return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; |
1da177e4 LT |
331 | } |
332 | ||
333 | /* This function checks if the address is a valid address to be used for | |
334 | * SCTP binding. | |
335 | * | |
336 | * Output: | |
337 | * Return 0 - If the address is a non-unicast or an illegal address. | |
338 | * Return 1 - If the address is a unicast. | |
339 | */ | |
5636bef7 VY |
340 | static int sctp_v4_addr_valid(union sctp_addr *addr, |
341 | struct sctp_sock *sp, | |
342 | const struct sk_buff *skb) | |
1da177e4 | 343 | { |
7dab83de VY |
344 | /* IPv4 addresses not allowed */ |
345 | if (sp && ipv6_only_sock(sctp_opt2sk(sp))) | |
346 | return 0; | |
347 | ||
1da177e4 | 348 | /* Is this a non-unicast address or a unusable SCTP address? */ |
b5cb2bbc | 349 | if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) |
1da177e4 LT |
350 | return 0; |
351 | ||
d808ad9a | 352 | /* Is this a broadcast address? */ |
511c3f92 | 353 | if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST) |
d808ad9a | 354 | return 0; |
5636bef7 | 355 | |
1da177e4 LT |
356 | return 1; |
357 | } | |
358 | ||
359 | /* Should this be available for binding? */ | |
360 | static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) | |
361 | { | |
bb2db45b EB |
362 | struct net *net = sock_net(&sp->inet.sk); |
363 | int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr); | |
1da177e4 | 364 | |
1da177e4 | 365 | |
e6f1cebf | 366 | if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && |
cdac4e07 NH |
367 | ret != RTN_LOCAL && |
368 | !sp->inet.freebind && | |
369 | !sysctl_ip_nonlocal_bind) | |
1da177e4 | 370 | return 0; |
cdac4e07 | 371 | |
7dab83de VY |
372 | if (ipv6_only_sock(sctp_opt2sk(sp))) |
373 | return 0; | |
374 | ||
1da177e4 LT |
375 | return 1; |
376 | } | |
377 | ||
378 | /* Checking the loopback, private and other address scopes as defined in | |
379 | * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 | |
380 | * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. | |
381 | * | |
382 | * Level 0 - unusable SCTP addresses | |
383 | * Level 1 - loopback address | |
384 | * Level 2 - link-local addresses | |
385 | * Level 3 - private addresses. | |
386 | * Level 4 - global addresses | |
387 | * For INIT and INIT-ACK address list, let L be the level of | |
388 | * of requested destination address, sender and receiver | |
389 | * SHOULD include all of its addresses with level greater | |
390 | * than or equal to L. | |
72388433 BD |
391 | * |
392 | * IPv4 scoping can be controlled through sysctl option | |
393 | * net.sctp.addr_scope_policy | |
1da177e4 LT |
394 | */ |
395 | static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) | |
396 | { | |
397 | sctp_scope_t retval; | |
398 | ||
1da177e4 | 399 | /* Check for unusable SCTP addresses. */ |
b5cb2bbc | 400 | if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { |
1da177e4 | 401 | retval = SCTP_SCOPE_UNUSABLE; |
b5cb2bbc | 402 | } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { |
1da177e4 | 403 | retval = SCTP_SCOPE_LOOPBACK; |
b5cb2bbc | 404 | } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { |
1da177e4 | 405 | retval = SCTP_SCOPE_LINK; |
b5cb2bbc JP |
406 | } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || |
407 | ipv4_is_private_172(addr->v4.sin_addr.s_addr) || | |
408 | ipv4_is_private_192(addr->v4.sin_addr.s_addr)) { | |
1da177e4 LT |
409 | retval = SCTP_SCOPE_PRIVATE; |
410 | } else { | |
411 | retval = SCTP_SCOPE_GLOBAL; | |
412 | } | |
413 | ||
414 | return retval; | |
415 | } | |
416 | ||
417 | /* Returns a valid dst cache entry for the given source and destination ip | |
418 | * addresses. If an association is passed, trys to get a dst entry with a | |
419 | * source address that matches an address in the bind address list. | |
420 | */ | |
da0420be VY |
421 | static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr, |
422 | struct flowi *fl, struct sock *sk) | |
1da177e4 | 423 | { |
da0420be | 424 | struct sctp_association *asoc = t->asoc; |
1da177e4 | 425 | struct rtable *rt; |
9914ae3c | 426 | struct flowi4 *fl4 = &fl->u.ip4; |
1da177e4 | 427 | struct sctp_bind_addr *bp; |
1da177e4 | 428 | struct sctp_sockaddr_entry *laddr; |
1da177e4 | 429 | struct dst_entry *dst = NULL; |
da0420be | 430 | union sctp_addr *daddr = &t->ipaddr; |
1da177e4 LT |
431 | union sctp_addr dst_saddr; |
432 | ||
9914ae3c VY |
433 | memset(fl4, 0x0, sizeof(struct flowi4)); |
434 | fl4->daddr = daddr->v4.sin_addr.s_addr; | |
435 | fl4->fl4_dport = daddr->v4.sin_port; | |
436 | fl4->flowi4_proto = IPPROTO_SCTP; | |
1da177e4 | 437 | if (asoc) { |
9914ae3c VY |
438 | fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk); |
439 | fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if; | |
440 | fl4->fl4_sport = htons(asoc->base.bind_addr.port); | |
1da177e4 | 441 | } |
6429d3dc | 442 | if (saddr) { |
9914ae3c VY |
443 | fl4->saddr = saddr->v4.sin_addr.s_addr; |
444 | fl4->fl4_sport = saddr->v4.sin_port; | |
6429d3dc | 445 | } |
1da177e4 | 446 | |
bb33381d DB |
447 | pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr, |
448 | &fl4->saddr); | |
1da177e4 | 449 | |
bb2db45b | 450 | rt = ip_route_output_key(sock_net(sk), fl4); |
b23dd4fe | 451 | if (!IS_ERR(rt)) |
d8d1f30b | 452 | dst = &rt->dst; |
1da177e4 LT |
453 | |
454 | /* If there is no association or if a source address is passed, no | |
455 | * more validation is required. | |
456 | */ | |
457 | if (!asoc || saddr) | |
458 | goto out; | |
459 | ||
460 | bp = &asoc->base.bind_addr; | |
1da177e4 LT |
461 | |
462 | if (dst) { | |
463 | /* Walk through the bind address list and look for a bind | |
464 | * address that matches the source address of the returned dst. | |
465 | */ | |
18a353f4 | 466 | sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port)); |
559cf710 VY |
467 | rcu_read_lock(); |
468 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
8a07eb0a MH |
469 | if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) || |
470 | (laddr->state != SCTP_ADDR_SRC && | |
471 | !asoc->src_out_of_asoc_ok)) | |
dc022a98 | 472 | continue; |
854d43a4 | 473 | if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) |
1da177e4 LT |
474 | goto out_unlock; |
475 | } | |
559cf710 | 476 | rcu_read_unlock(); |
1da177e4 LT |
477 | |
478 | /* None of the bound addresses match the source address of the | |
479 | * dst. So release it. | |
480 | */ | |
481 | dst_release(dst); | |
482 | dst = NULL; | |
483 | } | |
484 | ||
485 | /* Walk through the bind address list and try to get a dst that | |
486 | * matches a bind address as the source address. | |
487 | */ | |
559cf710 VY |
488 | rcu_read_lock(); |
489 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
490 | if (!laddr->valid) | |
491 | continue; | |
f57d96b2 | 492 | if ((laddr->state == SCTP_ADDR_SRC) && |
6244be4e | 493 | (AF_INET == laddr->a.sa.sa_family)) { |
9914ae3c VY |
494 | fl4->saddr = laddr->a.v4.sin_addr.s_addr; |
495 | fl4->fl4_sport = laddr->a.v4.sin_port; | |
bb2db45b | 496 | rt = ip_route_output_key(sock_net(sk), fl4); |
b23dd4fe | 497 | if (!IS_ERR(rt)) { |
d8d1f30b | 498 | dst = &rt->dst; |
1da177e4 LT |
499 | goto out_unlock; |
500 | } | |
501 | } | |
502 | } | |
503 | ||
504 | out_unlock: | |
559cf710 | 505 | rcu_read_unlock(); |
1da177e4 | 506 | out: |
da0420be | 507 | t->dst = dst; |
1da177e4 | 508 | if (dst) |
bb33381d DB |
509 | pr_debug("rt_dst:%pI4, rt_src:%pI4\n", |
510 | &fl4->daddr, &fl4->saddr); | |
1da177e4 | 511 | else |
bb33381d | 512 | pr_debug("no route\n"); |
1da177e4 LT |
513 | } |
514 | ||
515 | /* For v4, the source address is cached in the route entry(dst). So no need | |
516 | * to cache it separately and hence this is an empty routine. | |
517 | */ | |
e5117101 | 518 | static void sctp_v4_get_saddr(struct sctp_sock *sk, |
9914ae3c | 519 | struct sctp_transport *t, |
9914ae3c | 520 | struct flowi *fl) |
1da177e4 | 521 | { |
9914ae3c VY |
522 | union sctp_addr *saddr = &t->saddr; |
523 | struct rtable *rt = (struct rtable *)t->dst; | |
23ec47a0 | 524 | |
1da177e4 LT |
525 | if (rt) { |
526 | saddr->v4.sin_family = AF_INET; | |
902ebd3e | 527 | saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr; |
1da177e4 LT |
528 | } |
529 | } | |
530 | ||
531 | /* What interface did this skb arrive on? */ | |
532 | static int sctp_v4_skb_iif(const struct sk_buff *skb) | |
533 | { | |
92101b3b | 534 | return inet_iif(skb); |
1da177e4 LT |
535 | } |
536 | ||
537 | /* Was this packet marked by Explicit Congestion Notification? */ | |
538 | static int sctp_v4_is_ce(const struct sk_buff *skb) | |
539 | { | |
eddc9ec5 | 540 | return INET_ECN_is_ce(ip_hdr(skb)->tos); |
1da177e4 LT |
541 | } |
542 | ||
543 | /* Create and initialize a new sk for the socket returned by accept(). */ | |
544 | static struct sock *sctp_v4_create_accept_sk(struct sock *sk, | |
545 | struct sctp_association *asoc) | |
546 | { | |
3b1e0a65 | 547 | struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, |
6257ff21 | 548 | sk->sk_prot); |
914e1c8b | 549 | struct inet_sock *newinet; |
1da177e4 LT |
550 | |
551 | if (!newsk) | |
552 | goto out; | |
553 | ||
554 | sock_init_data(NULL, newsk); | |
555 | ||
914e1c8b | 556 | sctp_copy_sock(newsk, sk, asoc); |
1da177e4 LT |
557 | sock_reset_flag(newsk, SOCK_ZAPPED); |
558 | ||
559 | newinet = inet_sk(newsk); | |
560 | ||
c720c7e8 | 561 | newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; |
1da177e4 | 562 | |
e6848976 | 563 | sk_refcnt_debug_inc(newsk); |
1da177e4 LT |
564 | |
565 | if (newsk->sk_prot->init(newsk)) { | |
566 | sk_common_release(newsk); | |
567 | newsk = NULL; | |
568 | } | |
569 | ||
570 | out: | |
571 | return newsk; | |
572 | } | |
573 | ||
574 | /* Map address, empty for v4 family */ | |
575 | static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) | |
576 | { | |
577 | /* Empty */ | |
578 | } | |
579 | ||
580 | /* Dump the v4 addr to the seq file. */ | |
581 | static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) | |
582 | { | |
21454aaa | 583 | seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); |
1da177e4 LT |
584 | } |
585 | ||
b9031d9d VY |
586 | static void sctp_v4_ecn_capable(struct sock *sk) |
587 | { | |
588 | INET_ECN_xmit(sk); | |
589 | } | |
590 | ||
bd2a13e2 | 591 | static void sctp_addr_wq_timeout_handler(unsigned long arg) |
9f7d653b | 592 | { |
4db67e80 | 593 | struct net *net = (struct net *)arg; |
9f7d653b MH |
594 | struct sctp_sockaddr_entry *addrw, *temp; |
595 | struct sctp_sock *sp; | |
596 | ||
4db67e80 | 597 | spin_lock_bh(&net->sctp.addr_wq_lock); |
9f7d653b | 598 | |
4db67e80 | 599 | list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { |
bb33381d DB |
600 | pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at " |
601 | "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa, | |
602 | addrw->state, addrw); | |
9f7d653b | 603 | |
dfd56b8b | 604 | #if IS_ENABLED(CONFIG_IPV6) |
9f7d653b MH |
605 | /* Now we send an ASCONF for each association */ |
606 | /* Note. we currently don't handle link local IPv6 addressees */ | |
607 | if (addrw->a.sa.sa_family == AF_INET6) { | |
608 | struct in6_addr *in6; | |
609 | ||
610 | if (ipv6_addr_type(&addrw->a.v6.sin6_addr) & | |
611 | IPV6_ADDR_LINKLOCAL) | |
612 | goto free_next; | |
613 | ||
614 | in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr; | |
4db67e80 | 615 | if (ipv6_chk_addr(net, in6, NULL, 0) == 0 && |
9f7d653b MH |
616 | addrw->state == SCTP_ADDR_NEW) { |
617 | unsigned long timeo_val; | |
618 | ||
bb33381d DB |
619 | pr_debug("%s: this is on DAD, trying %d sec " |
620 | "later\n", __func__, | |
621 | SCTP_ADDRESS_TICK_DELAY); | |
622 | ||
9f7d653b MH |
623 | timeo_val = jiffies; |
624 | timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); | |
4db67e80 | 625 | mod_timer(&net->sctp.addr_wq_timer, timeo_val); |
9f7d653b MH |
626 | break; |
627 | } | |
628 | } | |
5d0c90cf | 629 | #endif |
4db67e80 | 630 | list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) { |
9f7d653b MH |
631 | struct sock *sk; |
632 | ||
633 | sk = sctp_opt2sk(sp); | |
634 | /* ignore bound-specific endpoints */ | |
635 | if (!sctp_is_ep_boundall(sk)) | |
636 | continue; | |
5bc1d1b4 | 637 | bh_lock_sock(sk); |
9f7d653b | 638 | if (sctp_asconf_mgmt(sp, addrw) < 0) |
bb33381d | 639 | pr_debug("%s: sctp_asconf_mgmt failed\n", __func__); |
5bc1d1b4 | 640 | bh_unlock_sock(sk); |
9f7d653b | 641 | } |
39d84a58 | 642 | #if IS_ENABLED(CONFIG_IPV6) |
9f7d653b | 643 | free_next: |
39d84a58 | 644 | #endif |
9f7d653b MH |
645 | list_del(&addrw->list); |
646 | kfree(addrw); | |
647 | } | |
4db67e80 | 648 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
649 | } |
650 | ||
4db67e80 | 651 | static void sctp_free_addr_wq(struct net *net) |
9f7d653b MH |
652 | { |
653 | struct sctp_sockaddr_entry *addrw; | |
654 | struct sctp_sockaddr_entry *temp; | |
655 | ||
4db67e80 EB |
656 | spin_lock_bh(&net->sctp.addr_wq_lock); |
657 | del_timer(&net->sctp.addr_wq_timer); | |
658 | list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { | |
9f7d653b MH |
659 | list_del(&addrw->list); |
660 | kfree(addrw); | |
661 | } | |
4db67e80 | 662 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
663 | } |
664 | ||
665 | /* lookup the entry for the same address in the addr_waitq | |
666 | * sctp_addr_wq MUST be locked | |
667 | */ | |
4db67e80 EB |
668 | static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net, |
669 | struct sctp_sockaddr_entry *addr) | |
9f7d653b MH |
670 | { |
671 | struct sctp_sockaddr_entry *addrw; | |
672 | ||
4db67e80 | 673 | list_for_each_entry(addrw, &net->sctp.addr_waitq, list) { |
9f7d653b MH |
674 | if (addrw->a.sa.sa_family != addr->a.sa.sa_family) |
675 | continue; | |
676 | if (addrw->a.sa.sa_family == AF_INET) { | |
677 | if (addrw->a.v4.sin_addr.s_addr == | |
678 | addr->a.v4.sin_addr.s_addr) | |
679 | return addrw; | |
680 | } else if (addrw->a.sa.sa_family == AF_INET6) { | |
681 | if (ipv6_addr_equal(&addrw->a.v6.sin6_addr, | |
682 | &addr->a.v6.sin6_addr)) | |
683 | return addrw; | |
684 | } | |
685 | } | |
686 | return NULL; | |
687 | } | |
688 | ||
4db67e80 | 689 | void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd) |
9f7d653b MH |
690 | { |
691 | struct sctp_sockaddr_entry *addrw; | |
692 | unsigned long timeo_val; | |
693 | ||
694 | /* first, we check if an opposite message already exist in the queue. | |
695 | * If we found such message, it is removed. | |
696 | * This operation is a bit stupid, but the DHCP client attaches the | |
697 | * new address after a couple of addition and deletion of that address | |
698 | */ | |
699 | ||
4db67e80 | 700 | spin_lock_bh(&net->sctp.addr_wq_lock); |
9f7d653b | 701 | /* Offsets existing events in addr_wq */ |
4db67e80 | 702 | addrw = sctp_addr_wq_lookup(net, addr); |
9f7d653b MH |
703 | if (addrw) { |
704 | if (addrw->state != cmd) { | |
bb33381d DB |
705 | pr_debug("%s: offsets existing entry for %d, addr:%pISc " |
706 | "in wq:%p\n", __func__, addrw->state, &addrw->a.sa, | |
707 | &net->sctp.addr_waitq); | |
708 | ||
9f7d653b MH |
709 | list_del(&addrw->list); |
710 | kfree(addrw); | |
711 | } | |
4db67e80 | 712 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
713 | return; |
714 | } | |
715 | ||
716 | /* OK, we have to add the new address to the wait queue */ | |
717 | addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); | |
718 | if (addrw == NULL) { | |
4db67e80 | 719 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
720 | return; |
721 | } | |
722 | addrw->state = cmd; | |
4db67e80 | 723 | list_add_tail(&addrw->list, &net->sctp.addr_waitq); |
bb33381d DB |
724 | |
725 | pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n", | |
726 | __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq); | |
9f7d653b | 727 | |
4db67e80 | 728 | if (!timer_pending(&net->sctp.addr_wq_timer)) { |
9f7d653b MH |
729 | timeo_val = jiffies; |
730 | timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); | |
4db67e80 | 731 | mod_timer(&net->sctp.addr_wq_timer, timeo_val); |
9f7d653b | 732 | } |
4db67e80 | 733 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
734 | } |
735 | ||
29303547 VY |
736 | /* Event handler for inet address addition/deletion events. |
737 | * The sctp_local_addr_list needs to be protocted by a spin lock since | |
738 | * multiple notifiers (say IPv4 and IPv6) may be running at the same | |
739 | * time and thus corrupt the list. | |
740 | * The reader side is protected with RCU. | |
741 | */ | |
24123186 AB |
742 | static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, |
743 | void *ptr) | |
1da177e4 | 744 | { |
29c7cf96 | 745 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
29303547 VY |
746 | struct sctp_sockaddr_entry *addr = NULL; |
747 | struct sctp_sockaddr_entry *temp; | |
4db67e80 | 748 | struct net *net = dev_net(ifa->ifa_dev->dev); |
22626216 | 749 | int found = 0; |
1da177e4 | 750 | |
29c7cf96 SS |
751 | switch (ev) { |
752 | case NETDEV_UP: | |
753 | addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); | |
754 | if (addr) { | |
755 | addr->a.v4.sin_family = AF_INET; | |
756 | addr->a.v4.sin_port = 0; | |
757 | addr->a.v4.sin_addr.s_addr = ifa->ifa_local; | |
29303547 | 758 | addr->valid = 1; |
4db67e80 EB |
759 | spin_lock_bh(&net->sctp.local_addr_lock); |
760 | list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list); | |
761 | sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW); | |
762 | spin_unlock_bh(&net->sctp.local_addr_lock); | |
29c7cf96 SS |
763 | } |
764 | break; | |
765 | case NETDEV_DOWN: | |
4db67e80 | 766 | spin_lock_bh(&net->sctp.local_addr_lock); |
29303547 | 767 | list_for_each_entry_safe(addr, temp, |
4db67e80 | 768 | &net->sctp.local_addr_list, list) { |
a40a7d15 PE |
769 | if (addr->a.sa.sa_family == AF_INET && |
770 | addr->a.v4.sin_addr.s_addr == | |
771 | ifa->ifa_local) { | |
4db67e80 | 772 | sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL); |
22626216 | 773 | found = 1; |
29303547 VY |
774 | addr->valid = 0; |
775 | list_del_rcu(&addr->list); | |
29c7cf96 SS |
776 | break; |
777 | } | |
778 | } | |
4db67e80 | 779 | spin_unlock_bh(&net->sctp.local_addr_lock); |
22626216 | 780 | if (found) |
1231f0ba | 781 | kfree_rcu(addr, rcu); |
29c7cf96 SS |
782 | break; |
783 | } | |
1da177e4 LT |
784 | |
785 | return NOTIFY_DONE; | |
786 | } | |
787 | ||
788 | /* | |
789 | * Initialize the control inode/socket with a control endpoint data | |
790 | * structure. This endpoint is reserved exclusively for the OOTB processing. | |
791 | */ | |
2ce95503 | 792 | static int sctp_ctl_sock_init(struct net *net) |
1da177e4 LT |
793 | { |
794 | int err; | |
fb13d9f9 | 795 | sa_family_t family = PF_INET; |
1da177e4 LT |
796 | |
797 | if (sctp_get_pf_specific(PF_INET6)) | |
798 | family = PF_INET6; | |
1da177e4 | 799 | |
2ce95503 EB |
800 | err = inet_ctl_sock_create(&net->sctp.ctl_sock, family, |
801 | SOCK_SEQPACKET, IPPROTO_SCTP, net); | |
fb13d9f9 BH |
802 | |
803 | /* If IPv6 socket could not be created, try the IPv4 socket */ | |
804 | if (err < 0 && family == PF_INET6) | |
2ce95503 | 805 | err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET, |
fb13d9f9 | 806 | SOCK_SEQPACKET, IPPROTO_SCTP, |
2ce95503 | 807 | net); |
fb13d9f9 | 808 | |
1da177e4 | 809 | if (err < 0) { |
145ce502 | 810 | pr_err("Failed to create the SCTP control socket\n"); |
1da177e4 LT |
811 | return err; |
812 | } | |
1da177e4 LT |
813 | return 0; |
814 | } | |
815 | ||
816 | /* Register address family specific functions. */ | |
817 | int sctp_register_af(struct sctp_af *af) | |
818 | { | |
819 | switch (af->sa_family) { | |
820 | case AF_INET: | |
821 | if (sctp_af_v4_specific) | |
822 | return 0; | |
823 | sctp_af_v4_specific = af; | |
824 | break; | |
825 | case AF_INET6: | |
826 | if (sctp_af_v6_specific) | |
827 | return 0; | |
828 | sctp_af_v6_specific = af; | |
829 | break; | |
830 | default: | |
831 | return 0; | |
832 | } | |
833 | ||
834 | INIT_LIST_HEAD(&af->list); | |
835 | list_add_tail(&af->list, &sctp_address_families); | |
836 | return 1; | |
837 | } | |
838 | ||
839 | /* Get the table of functions for manipulating a particular address | |
840 | * family. | |
841 | */ | |
842 | struct sctp_af *sctp_get_af_specific(sa_family_t family) | |
843 | { | |
844 | switch (family) { | |
845 | case AF_INET: | |
846 | return sctp_af_v4_specific; | |
847 | case AF_INET6: | |
848 | return sctp_af_v6_specific; | |
849 | default: | |
850 | return NULL; | |
851 | } | |
852 | } | |
853 | ||
854 | /* Common code to initialize a AF_INET msg_name. */ | |
855 | static void sctp_inet_msgname(char *msgname, int *addr_len) | |
856 | { | |
857 | struct sockaddr_in *sin; | |
858 | ||
859 | sin = (struct sockaddr_in *)msgname; | |
860 | *addr_len = sizeof(struct sockaddr_in); | |
861 | sin->sin_family = AF_INET; | |
862 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
863 | } | |
864 | ||
865 | /* Copy the primary address of the peer primary address as the msg_name. */ | |
866 | static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, | |
867 | int *addr_len) | |
868 | { | |
869 | struct sockaddr_in *sin, *sinfrom; | |
870 | ||
871 | if (msgname) { | |
872 | struct sctp_association *asoc; | |
873 | ||
874 | asoc = event->asoc; | |
875 | sctp_inet_msgname(msgname, addr_len); | |
876 | sin = (struct sockaddr_in *)msgname; | |
877 | sinfrom = &asoc->peer.primary_addr.v4; | |
878 | sin->sin_port = htons(asoc->peer.port); | |
879 | sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; | |
880 | } | |
881 | } | |
882 | ||
883 | /* Initialize and copy out a msgname from an inbound skb. */ | |
884 | static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) | |
885 | { | |
1da177e4 | 886 | if (msgname) { |
2c0fd387 ACM |
887 | struct sctphdr *sh = sctp_hdr(skb); |
888 | struct sockaddr_in *sin = (struct sockaddr_in *)msgname; | |
889 | ||
1da177e4 | 890 | sctp_inet_msgname(msgname, len); |
1da177e4 | 891 | sin->sin_port = sh->source; |
eddc9ec5 | 892 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
1da177e4 LT |
893 | } |
894 | } | |
895 | ||
896 | /* Do we support this AF? */ | |
897 | static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) | |
898 | { | |
899 | /* PF_INET only supports AF_INET addresses. */ | |
a02cec21 | 900 | return AF_INET == family; |
1da177e4 LT |
901 | } |
902 | ||
903 | /* Address matching with wildcards allowed. */ | |
904 | static int sctp_inet_cmp_addr(const union sctp_addr *addr1, | |
905 | const union sctp_addr *addr2, | |
906 | struct sctp_sock *opt) | |
907 | { | |
908 | /* PF_INET only supports AF_INET addresses. */ | |
909 | if (addr1->sa.sa_family != addr2->sa.sa_family) | |
910 | return 0; | |
e6f1cebf AV |
911 | if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || |
912 | htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) | |
1da177e4 LT |
913 | return 1; |
914 | if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) | |
915 | return 1; | |
916 | ||
917 | return 0; | |
918 | } | |
919 | ||
920 | /* Verify that provided sockaddr looks bindable. Common verification has | |
921 | * already been taken care of. | |
922 | */ | |
923 | static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
924 | { | |
925 | return sctp_v4_available(addr, opt); | |
926 | } | |
927 | ||
928 | /* Verify that sockaddr looks sendable. Common verification has already | |
929 | * been taken care of. | |
930 | */ | |
931 | static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
932 | { | |
933 | return 1; | |
934 | } | |
935 | ||
936 | /* Fill in Supported Address Type information for INIT and INIT-ACK | |
937 | * chunks. Returns number of addresses supported. | |
938 | */ | |
939 | static int sctp_inet_supported_addrs(const struct sctp_sock *opt, | |
3dbe8656 | 940 | __be16 *types) |
1da177e4 LT |
941 | { |
942 | types[0] = SCTP_PARAM_IPV4_ADDRESS; | |
943 | return 1; | |
944 | } | |
945 | ||
946 | /* Wrapper routine that calls the ip transmit routine. */ | |
947 | static inline int sctp_v4_xmit(struct sk_buff *skb, | |
f880374c | 948 | struct sctp_transport *transport) |
1da177e4 | 949 | { |
f880374c HX |
950 | struct inet_sock *inet = inet_sk(skb->sk); |
951 | ||
bb33381d DB |
952 | pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb, |
953 | skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr); | |
1da177e4 | 954 | |
f880374c HX |
955 | inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? |
956 | IP_PMTUDISC_DO : IP_PMTUDISC_DONT; | |
957 | ||
b01a2407 | 958 | SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS); |
bb33381d | 959 | |
d9d8da80 | 960 | return ip_queue_xmit(skb, &transport->fl); |
1da177e4 LT |
961 | } |
962 | ||
15efbe76 | 963 | static struct sctp_af sctp_af_inet; |
1da177e4 LT |
964 | |
965 | static struct sctp_pf sctp_pf_inet = { | |
966 | .event_msgname = sctp_inet_event_msgname, | |
967 | .skb_msgname = sctp_inet_skb_msgname, | |
968 | .af_supported = sctp_inet_af_supported, | |
969 | .cmp_addr = sctp_inet_cmp_addr, | |
970 | .bind_verify = sctp_inet_bind_verify, | |
971 | .send_verify = sctp_inet_send_verify, | |
972 | .supported_addrs = sctp_inet_supported_addrs, | |
973 | .create_accept_sk = sctp_v4_create_accept_sk, | |
974 | .addr_v4map = sctp_v4_addr_v4map, | |
15efbe76 | 975 | .af = &sctp_af_inet |
1da177e4 LT |
976 | }; |
977 | ||
978 | /* Notifier for inetaddr addition/deletion events. */ | |
979 | static struct notifier_block sctp_inetaddr_notifier = { | |
980 | .notifier_call = sctp_inetaddr_event, | |
981 | }; | |
982 | ||
983 | /* Socket operations. */ | |
90ddc4f0 | 984 | static const struct proto_ops inet_seqpacket_ops = { |
543d9cfe ACM |
985 | .family = PF_INET, |
986 | .owner = THIS_MODULE, | |
987 | .release = inet_release, /* Needs to be wrapped... */ | |
988 | .bind = inet_bind, | |
989 | .connect = inet_dgram_connect, | |
990 | .socketpair = sock_no_socketpair, | |
991 | .accept = inet_accept, | |
992 | .getname = inet_getname, /* Semantics are different. */ | |
993 | .poll = sctp_poll, | |
994 | .ioctl = inet_ioctl, | |
995 | .listen = sctp_inet_listen, | |
996 | .shutdown = inet_shutdown, /* Looks harmless. */ | |
997 | .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ | |
998 | .getsockopt = sock_common_getsockopt, | |
999 | .sendmsg = inet_sendmsg, | |
1000 | .recvmsg = sock_common_recvmsg, | |
1001 | .mmap = sock_no_mmap, | |
1002 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1003 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1004 | .compat_setsockopt = compat_sock_common_setsockopt, |
1005 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1006 | #endif |
1da177e4 LT |
1007 | }; |
1008 | ||
1009 | /* Registration with AF_INET family. */ | |
1010 | static struct inet_protosw sctp_seqpacket_protosw = { | |
1011 | .type = SOCK_SEQPACKET, | |
1012 | .protocol = IPPROTO_SCTP, | |
1013 | .prot = &sctp_prot, | |
1014 | .ops = &inet_seqpacket_ops, | |
1da177e4 LT |
1015 | .no_check = 0, |
1016 | .flags = SCTP_PROTOSW_FLAG | |
1017 | }; | |
1018 | static struct inet_protosw sctp_stream_protosw = { | |
1019 | .type = SOCK_STREAM, | |
1020 | .protocol = IPPROTO_SCTP, | |
1021 | .prot = &sctp_prot, | |
1022 | .ops = &inet_seqpacket_ops, | |
1da177e4 LT |
1023 | .no_check = 0, |
1024 | .flags = SCTP_PROTOSW_FLAG | |
1025 | }; | |
1026 | ||
1027 | /* Register with IP layer. */ | |
32613090 | 1028 | static const struct net_protocol sctp_protocol = { |
1da177e4 LT |
1029 | .handler = sctp_rcv, |
1030 | .err_handler = sctp_v4_err, | |
1031 | .no_policy = 1, | |
bb2db45b | 1032 | .netns_ok = 1, |
8ed1dc44 | 1033 | .icmp_strict_tag_validation = 1, |
1da177e4 LT |
1034 | }; |
1035 | ||
1036 | /* IPv4 address related functions. */ | |
15efbe76 | 1037 | static struct sctp_af sctp_af_inet = { |
543d9cfe ACM |
1038 | .sa_family = AF_INET, |
1039 | .sctp_xmit = sctp_v4_xmit, | |
1040 | .setsockopt = ip_setsockopt, | |
1041 | .getsockopt = ip_getsockopt, | |
1042 | .get_dst = sctp_v4_get_dst, | |
1043 | .get_saddr = sctp_v4_get_saddr, | |
1044 | .copy_addrlist = sctp_v4_copy_addrlist, | |
1045 | .from_skb = sctp_v4_from_skb, | |
1046 | .from_sk = sctp_v4_from_sk, | |
1047 | .to_sk_saddr = sctp_v4_to_sk_saddr, | |
1048 | .to_sk_daddr = sctp_v4_to_sk_daddr, | |
1049 | .from_addr_param = sctp_v4_from_addr_param, | |
1050 | .to_addr_param = sctp_v4_to_addr_param, | |
543d9cfe ACM |
1051 | .cmp_addr = sctp_v4_cmp_addr, |
1052 | .addr_valid = sctp_v4_addr_valid, | |
1053 | .inaddr_any = sctp_v4_inaddr_any, | |
1054 | .is_any = sctp_v4_is_any, | |
1055 | .available = sctp_v4_available, | |
1056 | .scope = sctp_v4_scope, | |
1057 | .skb_iif = sctp_v4_skb_iif, | |
1058 | .is_ce = sctp_v4_is_ce, | |
1059 | .seq_dump_addr = sctp_v4_seq_dump_addr, | |
b9031d9d | 1060 | .ecn_capable = sctp_v4_ecn_capable, |
543d9cfe ACM |
1061 | .net_header_len = sizeof(struct iphdr), |
1062 | .sockaddr_len = sizeof(struct sockaddr_in), | |
3fdadf7d | 1063 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1064 | .compat_setsockopt = compat_ip_setsockopt, |
1065 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 1066 | #endif |
1da177e4 LT |
1067 | }; |
1068 | ||
8d72651d | 1069 | struct sctp_pf *sctp_get_pf_specific(sa_family_t family) |
1070 | { | |
1da177e4 LT |
1071 | switch (family) { |
1072 | case PF_INET: | |
1073 | return sctp_pf_inet_specific; | |
1074 | case PF_INET6: | |
1075 | return sctp_pf_inet6_specific; | |
1076 | default: | |
1077 | return NULL; | |
1078 | } | |
1079 | } | |
1080 | ||
1081 | /* Register the PF specific function table. */ | |
1082 | int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) | |
1083 | { | |
1084 | switch (family) { | |
1085 | case PF_INET: | |
1086 | if (sctp_pf_inet_specific) | |
1087 | return 0; | |
1088 | sctp_pf_inet_specific = pf; | |
1089 | break; | |
1090 | case PF_INET6: | |
1091 | if (sctp_pf_inet6_specific) | |
1092 | return 0; | |
1093 | sctp_pf_inet6_specific = pf; | |
1094 | break; | |
1095 | default: | |
1096 | return 0; | |
1097 | } | |
1098 | return 1; | |
1099 | } | |
1100 | ||
b01a2407 | 1101 | static inline int init_sctp_mibs(struct net *net) |
996b1dba | 1102 | { |
b01a2407 | 1103 | return snmp_mib_init((void __percpu **)net->sctp.sctp_statistics, |
1823e4c8 ED |
1104 | sizeof(struct sctp_mib), |
1105 | __alignof__(struct sctp_mib)); | |
1da177e4 LT |
1106 | } |
1107 | ||
b01a2407 | 1108 | static inline void cleanup_sctp_mibs(struct net *net) |
1da177e4 | 1109 | { |
b01a2407 | 1110 | snmp_mib_free((void __percpu **)net->sctp.sctp_statistics); |
1da177e4 LT |
1111 | } |
1112 | ||
270637ab VY |
1113 | static void sctp_v4_pf_init(void) |
1114 | { | |
1115 | /* Initialize the SCTP specific PF functions. */ | |
1116 | sctp_register_pf(&sctp_pf_inet, PF_INET); | |
1117 | sctp_register_af(&sctp_af_inet); | |
1118 | } | |
1119 | ||
1120 | static void sctp_v4_pf_exit(void) | |
1121 | { | |
1122 | list_del(&sctp_af_inet.list); | |
1123 | } | |
1124 | ||
1125 | static int sctp_v4_protosw_init(void) | |
1126 | { | |
1127 | int rc; | |
1128 | ||
1129 | rc = proto_register(&sctp_prot, 1); | |
1130 | if (rc) | |
1131 | return rc; | |
1132 | ||
1133 | /* Register SCTP(UDP and TCP style) with socket layer. */ | |
1134 | inet_register_protosw(&sctp_seqpacket_protosw); | |
1135 | inet_register_protosw(&sctp_stream_protosw); | |
1136 | ||
1137 | return 0; | |
1138 | } | |
1139 | ||
1140 | static void sctp_v4_protosw_exit(void) | |
1141 | { | |
1142 | inet_unregister_protosw(&sctp_stream_protosw); | |
1143 | inet_unregister_protosw(&sctp_seqpacket_protosw); | |
1144 | proto_unregister(&sctp_prot); | |
1145 | } | |
1146 | ||
1147 | static int sctp_v4_add_protocol(void) | |
1148 | { | |
1149 | /* Register notifier for inet address additions/deletions. */ | |
1150 | register_inetaddr_notifier(&sctp_inetaddr_notifier); | |
1151 | ||
1152 | /* Register SCTP with inet layer. */ | |
1153 | if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) | |
1154 | return -EAGAIN; | |
1155 | ||
1156 | return 0; | |
1157 | } | |
1158 | ||
1159 | static void sctp_v4_del_protocol(void) | |
1160 | { | |
1161 | inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); | |
1162 | unregister_inetaddr_notifier(&sctp_inetaddr_notifier); | |
1163 | } | |
1164 | ||
f5f417c0 | 1165 | static int __net_init sctp_net_init(struct net *net) |
4db67e80 | 1166 | { |
2ce95503 EB |
1167 | int status; |
1168 | ||
e1fc3b14 EB |
1169 | /* |
1170 | * 14. Suggested SCTP Protocol Parameter Values | |
1171 | */ | |
1172 | /* The following protocol parameters are RECOMMENDED: */ | |
1173 | /* RTO.Initial - 3 seconds */ | |
1174 | net->sctp.rto_initial = SCTP_RTO_INITIAL; | |
1175 | /* RTO.Min - 1 second */ | |
1176 | net->sctp.rto_min = SCTP_RTO_MIN; | |
1177 | /* RTO.Max - 60 seconds */ | |
1178 | net->sctp.rto_max = SCTP_RTO_MAX; | |
1179 | /* RTO.Alpha - 1/8 */ | |
1180 | net->sctp.rto_alpha = SCTP_RTO_ALPHA; | |
1181 | /* RTO.Beta - 1/4 */ | |
1182 | net->sctp.rto_beta = SCTP_RTO_BETA; | |
1183 | ||
1184 | /* Valid.Cookie.Life - 60 seconds */ | |
1185 | net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; | |
1186 | ||
1187 | /* Whether Cookie Preservative is enabled(1) or not(0) */ | |
1188 | net->sctp.cookie_preserve_enable = 1; | |
1189 | ||
3c68198e | 1190 | /* Default sctp sockets to use md5 as their hmac alg */ |
0d0863b0 | 1191 | #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5) |
3c68198e | 1192 | net->sctp.sctp_hmac_alg = "md5"; |
0d0863b0 | 1193 | #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1) |
3c68198e NH |
1194 | net->sctp.sctp_hmac_alg = "sha1"; |
1195 | #else | |
1196 | net->sctp.sctp_hmac_alg = NULL; | |
1197 | #endif | |
1198 | ||
e1fc3b14 EB |
1199 | /* Max.Burst - 4 */ |
1200 | net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST; | |
1201 | ||
1202 | /* Association.Max.Retrans - 10 attempts | |
1203 | * Path.Max.Retrans - 5 attempts (per destination address) | |
1204 | * Max.Init.Retransmits - 8 attempts | |
1205 | */ | |
1206 | net->sctp.max_retrans_association = 10; | |
1207 | net->sctp.max_retrans_path = 5; | |
1208 | net->sctp.max_retrans_init = 8; | |
1209 | ||
1210 | /* Sendbuffer growth - do per-socket accounting */ | |
1211 | net->sctp.sndbuf_policy = 0; | |
1212 | ||
1213 | /* Rcvbuffer growth - do per-socket accounting */ | |
1214 | net->sctp.rcvbuf_policy = 0; | |
1215 | ||
1216 | /* HB.interval - 30 seconds */ | |
1217 | net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; | |
1218 | ||
1219 | /* delayed SACK timeout */ | |
1220 | net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; | |
1221 | ||
1222 | /* Disable ADDIP by default. */ | |
1223 | net->sctp.addip_enable = 0; | |
1224 | net->sctp.addip_noauth = 0; | |
1225 | net->sctp.default_auto_asconf = 0; | |
1226 | ||
1227 | /* Enable PR-SCTP by default. */ | |
1228 | net->sctp.prsctp_enable = 1; | |
1229 | ||
1230 | /* Disable AUTH by default. */ | |
1231 | net->sctp.auth_enable = 0; | |
1232 | ||
1233 | /* Set SCOPE policy to enabled */ | |
1234 | net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE; | |
1235 | ||
1236 | /* Set the default rwnd update threshold */ | |
1237 | net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT; | |
1238 | ||
1239 | /* Initialize maximum autoclose timeout. */ | |
1240 | net->sctp.max_autoclose = INT_MAX / HZ; | |
1241 | ||
ebb7e95d EB |
1242 | status = sctp_sysctl_net_register(net); |
1243 | if (status) | |
1244 | goto err_sysctl_register; | |
1245 | ||
b01a2407 EB |
1246 | /* Allocate and initialise sctp mibs. */ |
1247 | status = init_sctp_mibs(net); | |
1248 | if (status) | |
1249 | goto err_init_mibs; | |
1250 | ||
13d782f6 EB |
1251 | /* Initialize proc fs directory. */ |
1252 | status = sctp_proc_init(net); | |
1253 | if (status) | |
1254 | goto err_init_proc; | |
1255 | ||
1256 | sctp_dbg_objcnt_init(net); | |
1257 | ||
2ce95503 EB |
1258 | /* Initialize the control inode/socket for handling OOTB packets. */ |
1259 | if ((status = sctp_ctl_sock_init(net))) { | |
1260 | pr_err("Failed to initialize the SCTP control sock\n"); | |
1261 | goto err_ctl_sock_init; | |
1262 | } | |
1263 | ||
4db67e80 EB |
1264 | /* Initialize the local address list. */ |
1265 | INIT_LIST_HEAD(&net->sctp.local_addr_list); | |
1266 | spin_lock_init(&net->sctp.local_addr_lock); | |
1267 | sctp_get_local_addr_list(net); | |
1268 | ||
1269 | /* Initialize the address event list */ | |
1270 | INIT_LIST_HEAD(&net->sctp.addr_waitq); | |
1271 | INIT_LIST_HEAD(&net->sctp.auto_asconf_splist); | |
1272 | spin_lock_init(&net->sctp.addr_wq_lock); | |
1273 | net->sctp.addr_wq_timer.expires = 0; | |
1274 | setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, | |
1275 | (unsigned long)net); | |
1276 | ||
1277 | return 0; | |
2ce95503 EB |
1278 | |
1279 | err_ctl_sock_init: | |
13d782f6 EB |
1280 | sctp_dbg_objcnt_exit(net); |
1281 | sctp_proc_exit(net); | |
1282 | err_init_proc: | |
b01a2407 EB |
1283 | cleanup_sctp_mibs(net); |
1284 | err_init_mibs: | |
ebb7e95d EB |
1285 | sctp_sysctl_net_unregister(net); |
1286 | err_sysctl_register: | |
2ce95503 | 1287 | return status; |
4db67e80 EB |
1288 | } |
1289 | ||
f5f417c0 | 1290 | static void __net_exit sctp_net_exit(struct net *net) |
4db67e80 EB |
1291 | { |
1292 | /* Free the local address list */ | |
1293 | sctp_free_addr_wq(net); | |
1294 | sctp_free_local_addr_list(net); | |
2ce95503 EB |
1295 | |
1296 | /* Free the control endpoint. */ | |
1297 | inet_ctl_sock_destroy(net->sctp.ctl_sock); | |
13d782f6 EB |
1298 | |
1299 | sctp_dbg_objcnt_exit(net); | |
1300 | ||
1301 | sctp_proc_exit(net); | |
b01a2407 | 1302 | cleanup_sctp_mibs(net); |
ebb7e95d | 1303 | sctp_sysctl_net_unregister(net); |
4db67e80 EB |
1304 | } |
1305 | ||
1306 | static struct pernet_operations sctp_net_ops = { | |
1307 | .init = sctp_net_init, | |
1308 | .exit = sctp_net_exit, | |
1309 | }; | |
1310 | ||
1da177e4 | 1311 | /* Initialize the universe into something sensible. */ |
dda91928 | 1312 | static __init int sctp_init(void) |
1da177e4 LT |
1313 | { |
1314 | int i; | |
1315 | int status = -EINVAL; | |
1316 | unsigned long goal; | |
4d93df0a NH |
1317 | unsigned long limit; |
1318 | int max_share; | |
1da177e4 LT |
1319 | int order; |
1320 | ||
bb33381d DB |
1321 | BUILD_BUG_ON(sizeof(struct sctp_ulpevent) > |
1322 | sizeof(((struct sk_buff *) 0)->cb)); | |
1da177e4 | 1323 | |
827bf122 | 1324 | /* Allocate bind_bucket and chunk caches. */ |
1da177e4 LT |
1325 | status = -ENOBUFS; |
1326 | sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", | |
1327 | sizeof(struct sctp_bind_bucket), | |
1328 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1329 | NULL); |
1da177e4 | 1330 | if (!sctp_bucket_cachep) |
827bf122 | 1331 | goto out; |
1da177e4 LT |
1332 | |
1333 | sctp_chunk_cachep = kmem_cache_create("sctp_chunk", | |
1334 | sizeof(struct sctp_chunk), | |
1335 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1336 | NULL); |
1da177e4 LT |
1337 | if (!sctp_chunk_cachep) |
1338 | goto err_chunk_cachep; | |
1339 | ||
632c928a EB |
1340 | status = percpu_counter_init(&sctp_sockets_allocated, 0); |
1341 | if (status) | |
1342 | goto err_percpu_counter_init; | |
1343 | ||
1da177e4 LT |
1344 | /* Implementation specific variables. */ |
1345 | ||
1346 | /* Initialize default stream count setup information. */ | |
1347 | sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; | |
1348 | sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; | |
1349 | ||
1350 | /* Initialize handle used for association ids. */ | |
1351 | idr_init(&sctp_assocs_id); | |
1352 | ||
f03d78db | 1353 | limit = nr_free_buffer_pages() / 8; |
4d93df0a NH |
1354 | limit = max(limit, 128UL); |
1355 | sysctl_sctp_mem[0] = limit / 4 * 3; | |
1356 | sysctl_sctp_mem[1] = limit; | |
1357 | sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; | |
1358 | ||
1359 | /* Set per-socket limits to no more than 1/128 the pressure threshold*/ | |
1360 | limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); | |
1361 | max_share = min(4UL*1024*1024, limit); | |
1362 | ||
845525a6 | 1363 | sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ |
87fb4b7b | 1364 | sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1); |
4d93df0a NH |
1365 | sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); |
1366 | ||
3ab224be | 1367 | sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; |
4d93df0a NH |
1368 | sysctl_sctp_wmem[1] = 16*1024; |
1369 | sysctl_sctp_wmem[2] = max(64*1024, max_share); | |
1370 | ||
1da177e4 LT |
1371 | /* Size and allocate the association hash table. |
1372 | * The methodology is similar to that of the tcp hash tables. | |
1373 | */ | |
4481374c JB |
1374 | if (totalram_pages >= (128 * 1024)) |
1375 | goal = totalram_pages >> (22 - PAGE_SHIFT); | |
1da177e4 | 1376 | else |
4481374c | 1377 | goal = totalram_pages >> (24 - PAGE_SHIFT); |
1da177e4 LT |
1378 | |
1379 | for (order = 0; (1UL << order) < goal; order++) | |
1380 | ; | |
1381 | ||
1382 | do { | |
1383 | sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / | |
1384 | sizeof(struct sctp_hashbucket); | |
1385 | if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) | |
1386 | continue; | |
1387 | sctp_assoc_hashtable = (struct sctp_hashbucket *) | |
a84b50ce | 1388 | __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order); |
1da177e4 LT |
1389 | } while (!sctp_assoc_hashtable && --order > 0); |
1390 | if (!sctp_assoc_hashtable) { | |
145ce502 | 1391 | pr_err("Failed association hash alloc\n"); |
1da177e4 LT |
1392 | status = -ENOMEM; |
1393 | goto err_ahash_alloc; | |
1394 | } | |
1395 | for (i = 0; i < sctp_assoc_hashsize; i++) { | |
1396 | rwlock_init(&sctp_assoc_hashtable[i].lock); | |
d970dbf8 | 1397 | INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); |
1da177e4 LT |
1398 | } |
1399 | ||
1400 | /* Allocate and initialize the endpoint hash table. */ | |
1401 | sctp_ep_hashsize = 64; | |
3b77d661 | 1402 | sctp_ep_hashtable = |
1da177e4 LT |
1403 | kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); |
1404 | if (!sctp_ep_hashtable) { | |
145ce502 | 1405 | pr_err("Failed endpoint_hash alloc\n"); |
1da177e4 LT |
1406 | status = -ENOMEM; |
1407 | goto err_ehash_alloc; | |
1408 | } | |
1409 | for (i = 0; i < sctp_ep_hashsize; i++) { | |
1410 | rwlock_init(&sctp_ep_hashtable[i].lock); | |
d970dbf8 | 1411 | INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); |
1da177e4 LT |
1412 | } |
1413 | ||
1414 | /* Allocate and initialize the SCTP port hash table. */ | |
1415 | do { | |
1416 | sctp_port_hashsize = (1UL << order) * PAGE_SIZE / | |
1417 | sizeof(struct sctp_bind_hashbucket); | |
1418 | if ((sctp_port_hashsize > (64 * 1024)) && order > 0) | |
1419 | continue; | |
1420 | sctp_port_hashtable = (struct sctp_bind_hashbucket *) | |
a84b50ce | 1421 | __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order); |
1da177e4 LT |
1422 | } while (!sctp_port_hashtable && --order > 0); |
1423 | if (!sctp_port_hashtable) { | |
145ce502 | 1424 | pr_err("Failed bind hash alloc\n"); |
1da177e4 LT |
1425 | status = -ENOMEM; |
1426 | goto err_bhash_alloc; | |
1427 | } | |
1428 | for (i = 0; i < sctp_port_hashsize; i++) { | |
1429 | spin_lock_init(&sctp_port_hashtable[i].lock); | |
d970dbf8 | 1430 | INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); |
1da177e4 LT |
1431 | } |
1432 | ||
145ce502 | 1433 | pr_info("Hash tables configured (established %d bind %d)\n", |
1da177e4 LT |
1434 | sctp_assoc_hashsize, sctp_port_hashsize); |
1435 | ||
1da177e4 LT |
1436 | sctp_sysctl_register(); |
1437 | ||
1438 | INIT_LIST_HEAD(&sctp_address_families); | |
270637ab VY |
1439 | sctp_v4_pf_init(); |
1440 | sctp_v6_pf_init(); | |
1da177e4 | 1441 | |
270637ab | 1442 | status = sctp_v4_protosw_init(); |
827bf122 | 1443 | |
1da177e4 | 1444 | if (status) |
270637ab VY |
1445 | goto err_protosw_init; |
1446 | ||
1447 | status = sctp_v6_protosw_init(); | |
1448 | if (status) | |
1449 | goto err_v6_protosw_init; | |
1da177e4 | 1450 | |
4db67e80 EB |
1451 | status = register_pernet_subsys(&sctp_net_ops); |
1452 | if (status) | |
1453 | goto err_register_pernet_subsys; | |
1454 | ||
270637ab VY |
1455 | status = sctp_v4_add_protocol(); |
1456 | if (status) | |
827bf122 | 1457 | goto err_add_protocol; |
827bf122 SS |
1458 | |
1459 | /* Register SCTP with inet6 layer. */ | |
1460 | status = sctp_v6_add_protocol(); | |
1461 | if (status) | |
1462 | goto err_v6_add_protocol; | |
1463 | ||
1da177e4 LT |
1464 | out: |
1465 | return status; | |
827bf122 | 1466 | err_v6_add_protocol: |
270637ab | 1467 | sctp_v4_del_protocol(); |
d1dd5247 | 1468 | err_add_protocol: |
4db67e80 EB |
1469 | unregister_pernet_subsys(&sctp_net_ops); |
1470 | err_register_pernet_subsys: | |
270637ab VY |
1471 | sctp_v6_protosw_exit(); |
1472 | err_v6_protosw_init: | |
1473 | sctp_v4_protosw_exit(); | |
1474 | err_protosw_init: | |
270637ab VY |
1475 | sctp_v4_pf_exit(); |
1476 | sctp_v6_pf_exit(); | |
1da177e4 | 1477 | sctp_sysctl_unregister(); |
1da177e4 LT |
1478 | free_pages((unsigned long)sctp_port_hashtable, |
1479 | get_order(sctp_port_hashsize * | |
1480 | sizeof(struct sctp_bind_hashbucket))); | |
1481 | err_bhash_alloc: | |
1482 | kfree(sctp_ep_hashtable); | |
1483 | err_ehash_alloc: | |
1484 | free_pages((unsigned long)sctp_assoc_hashtable, | |
1485 | get_order(sctp_assoc_hashsize * | |
1486 | sizeof(struct sctp_hashbucket))); | |
1487 | err_ahash_alloc: | |
632c928a EB |
1488 | percpu_counter_destroy(&sctp_sockets_allocated); |
1489 | err_percpu_counter_init: | |
1da177e4 LT |
1490 | kmem_cache_destroy(sctp_chunk_cachep); |
1491 | err_chunk_cachep: | |
1492 | kmem_cache_destroy(sctp_bucket_cachep); | |
1da177e4 LT |
1493 | goto out; |
1494 | } | |
1495 | ||
1496 | /* Exit handler for the SCTP protocol. */ | |
dda91928 | 1497 | static __exit void sctp_exit(void) |
1da177e4 LT |
1498 | { |
1499 | /* BUG. This should probably do something useful like clean | |
1500 | * up all the remaining associations and all that memory. | |
1501 | */ | |
1502 | ||
827bf122 SS |
1503 | /* Unregister with inet6/inet layers. */ |
1504 | sctp_v6_del_protocol(); | |
270637ab | 1505 | sctp_v4_del_protocol(); |
1da177e4 | 1506 | |
4db67e80 EB |
1507 | unregister_pernet_subsys(&sctp_net_ops); |
1508 | ||
270637ab VY |
1509 | /* Free protosw registrations */ |
1510 | sctp_v6_protosw_exit(); | |
1511 | sctp_v4_protosw_exit(); | |
1512 | ||
827bf122 | 1513 | /* Unregister with socket layer. */ |
270637ab VY |
1514 | sctp_v6_pf_exit(); |
1515 | sctp_v4_pf_exit(); | |
827bf122 | 1516 | |
1da177e4 | 1517 | sctp_sysctl_unregister(); |
1da177e4 LT |
1518 | |
1519 | free_pages((unsigned long)sctp_assoc_hashtable, | |
1520 | get_order(sctp_assoc_hashsize * | |
1521 | sizeof(struct sctp_hashbucket))); | |
1522 | kfree(sctp_ep_hashtable); | |
1523 | free_pages((unsigned long)sctp_port_hashtable, | |
1524 | get_order(sctp_port_hashsize * | |
1525 | sizeof(struct sctp_bind_hashbucket))); | |
1526 | ||
632c928a | 1527 | percpu_counter_destroy(&sctp_sockets_allocated); |
1da177e4 | 1528 | |
eaa184a1 JDB |
1529 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1530 | ||
827bf122 SS |
1531 | kmem_cache_destroy(sctp_chunk_cachep); |
1532 | kmem_cache_destroy(sctp_bucket_cachep); | |
1da177e4 LT |
1533 | } |
1534 | ||
1535 | module_init(sctp_init); | |
1536 | module_exit(sctp_exit); | |
1537 | ||
bb97d31f ACM |
1538 | /* |
1539 | * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. | |
1540 | */ | |
1541 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); | |
882a382c | 1542 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); |
91705c61 | 1543 | MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>"); |
1da177e4 | 1544 | MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); |
71acc0dd DM |
1545 | module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); |
1546 | MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); | |
1da177e4 | 1547 | MODULE_LICENSE("GPL"); |