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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * NETLINK Kernel-user communication protocol. | |
3 | * | |
4 | * Authors: Alan Cox <alan@redhat.com> | |
5 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | * | |
12 | * Tue Jun 26 14:36:48 MEST 2001 Herbert "herp" Rosmanith | |
13 | * added netlink_proto_exit | |
14 | * Tue Jan 22 18:32:44 BRST 2002 Arnaldo C. de Melo <acme@conectiva.com.br> | |
15 | * use nlk_sk, as sk->protinfo is on a diet 8) | |
4fdb3bb7 HW |
16 | * Fri Jul 22 19:51:12 MEST 2005 Harald Welte <laforge@gnumonks.org> |
17 | * - inc module use count of module that owns | |
18 | * the kernel socket in case userspace opens | |
19 | * socket of same protocol | |
20 | * - remove all module support, since netlink is | |
21 | * mandatory if CONFIG_NET=y these days | |
1da177e4 LT |
22 | */ |
23 | ||
24 | #include <linux/config.h> | |
25 | #include <linux/module.h> | |
26 | ||
27 | #include <linux/kernel.h> | |
28 | #include <linux/init.h> | |
1da177e4 LT |
29 | #include <linux/signal.h> |
30 | #include <linux/sched.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/stat.h> | |
34 | #include <linux/socket.h> | |
35 | #include <linux/un.h> | |
36 | #include <linux/fcntl.h> | |
37 | #include <linux/termios.h> | |
38 | #include <linux/sockios.h> | |
39 | #include <linux/net.h> | |
40 | #include <linux/fs.h> | |
41 | #include <linux/slab.h> | |
42 | #include <asm/uaccess.h> | |
43 | #include <linux/skbuff.h> | |
44 | #include <linux/netdevice.h> | |
45 | #include <linux/rtnetlink.h> | |
46 | #include <linux/proc_fs.h> | |
47 | #include <linux/seq_file.h> | |
48 | #include <linux/smp_lock.h> | |
49 | #include <linux/notifier.h> | |
50 | #include <linux/security.h> | |
51 | #include <linux/jhash.h> | |
52 | #include <linux/jiffies.h> | |
53 | #include <linux/random.h> | |
54 | #include <linux/bitops.h> | |
55 | #include <linux/mm.h> | |
56 | #include <linux/types.h> | |
54e0f520 AM |
57 | #include <linux/audit.h> |
58 | ||
1da177e4 LT |
59 | #include <net/sock.h> |
60 | #include <net/scm.h> | |
82ace47a | 61 | #include <net/netlink.h> |
1da177e4 LT |
62 | |
63 | #define Nprintk(a...) | |
f7fa9b10 | 64 | #define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8) |
1da177e4 LT |
65 | |
66 | struct netlink_sock { | |
67 | /* struct sock has to be the first member of netlink_sock */ | |
68 | struct sock sk; | |
69 | u32 pid; | |
1da177e4 | 70 | u32 dst_pid; |
d629b836 | 71 | u32 dst_group; |
f7fa9b10 PM |
72 | u32 flags; |
73 | u32 subscriptions; | |
74 | u32 ngroups; | |
75 | unsigned long *groups; | |
1da177e4 LT |
76 | unsigned long state; |
77 | wait_queue_head_t wait; | |
78 | struct netlink_callback *cb; | |
79 | spinlock_t cb_lock; | |
80 | void (*data_ready)(struct sock *sk, int bytes); | |
77247bbb | 81 | struct module *module; |
1da177e4 LT |
82 | }; |
83 | ||
77247bbb | 84 | #define NETLINK_KERNEL_SOCKET 0x1 |
9a4595bc | 85 | #define NETLINK_RECV_PKTINFO 0x2 |
77247bbb | 86 | |
1da177e4 LT |
87 | static inline struct netlink_sock *nlk_sk(struct sock *sk) |
88 | { | |
89 | return (struct netlink_sock *)sk; | |
90 | } | |
91 | ||
92 | struct nl_pid_hash { | |
93 | struct hlist_head *table; | |
94 | unsigned long rehash_time; | |
95 | ||
96 | unsigned int mask; | |
97 | unsigned int shift; | |
98 | ||
99 | unsigned int entries; | |
100 | unsigned int max_shift; | |
101 | ||
102 | u32 rnd; | |
103 | }; | |
104 | ||
105 | struct netlink_table { | |
106 | struct nl_pid_hash hash; | |
107 | struct hlist_head mc_list; | |
108 | unsigned int nl_nonroot; | |
f7fa9b10 | 109 | unsigned int groups; |
77247bbb | 110 | struct module *module; |
ab33a171 | 111 | int registered; |
1da177e4 LT |
112 | }; |
113 | ||
114 | static struct netlink_table *nl_table; | |
115 | ||
116 | static DECLARE_WAIT_QUEUE_HEAD(nl_table_wait); | |
117 | ||
118 | static int netlink_dump(struct sock *sk); | |
119 | static void netlink_destroy_callback(struct netlink_callback *cb); | |
120 | ||
121 | static DEFINE_RWLOCK(nl_table_lock); | |
122 | static atomic_t nl_table_users = ATOMIC_INIT(0); | |
123 | ||
124 | static struct notifier_block *netlink_chain; | |
125 | ||
d629b836 PM |
126 | static u32 netlink_group_mask(u32 group) |
127 | { | |
128 | return group ? 1 << (group - 1) : 0; | |
129 | } | |
130 | ||
1da177e4 LT |
131 | static struct hlist_head *nl_pid_hashfn(struct nl_pid_hash *hash, u32 pid) |
132 | { | |
133 | return &hash->table[jhash_1word(pid, hash->rnd) & hash->mask]; | |
134 | } | |
135 | ||
136 | static void netlink_sock_destruct(struct sock *sk) | |
137 | { | |
138 | skb_queue_purge(&sk->sk_receive_queue); | |
139 | ||
140 | if (!sock_flag(sk, SOCK_DEAD)) { | |
141 | printk("Freeing alive netlink socket %p\n", sk); | |
142 | return; | |
143 | } | |
144 | BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); | |
145 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); | |
146 | BUG_TRAP(!nlk_sk(sk)->cb); | |
f7fa9b10 | 147 | BUG_TRAP(!nlk_sk(sk)->groups); |
1da177e4 LT |
148 | } |
149 | ||
150 | /* This lock without WQ_FLAG_EXCLUSIVE is good on UP and it is _very_ bad on SMP. | |
151 | * Look, when several writers sleep and reader wakes them up, all but one | |
152 | * immediately hit write lock and grab all the cpus. Exclusive sleep solves | |
153 | * this, _but_ remember, it adds useless work on UP machines. | |
154 | */ | |
155 | ||
156 | static void netlink_table_grab(void) | |
157 | { | |
158 | write_lock_bh(&nl_table_lock); | |
159 | ||
160 | if (atomic_read(&nl_table_users)) { | |
161 | DECLARE_WAITQUEUE(wait, current); | |
162 | ||
163 | add_wait_queue_exclusive(&nl_table_wait, &wait); | |
164 | for(;;) { | |
165 | set_current_state(TASK_UNINTERRUPTIBLE); | |
166 | if (atomic_read(&nl_table_users) == 0) | |
167 | break; | |
168 | write_unlock_bh(&nl_table_lock); | |
169 | schedule(); | |
170 | write_lock_bh(&nl_table_lock); | |
171 | } | |
172 | ||
173 | __set_current_state(TASK_RUNNING); | |
174 | remove_wait_queue(&nl_table_wait, &wait); | |
175 | } | |
176 | } | |
177 | ||
178 | static __inline__ void netlink_table_ungrab(void) | |
179 | { | |
180 | write_unlock_bh(&nl_table_lock); | |
181 | wake_up(&nl_table_wait); | |
182 | } | |
183 | ||
184 | static __inline__ void | |
185 | netlink_lock_table(void) | |
186 | { | |
187 | /* read_lock() synchronizes us to netlink_table_grab */ | |
188 | ||
189 | read_lock(&nl_table_lock); | |
190 | atomic_inc(&nl_table_users); | |
191 | read_unlock(&nl_table_lock); | |
192 | } | |
193 | ||
194 | static __inline__ void | |
195 | netlink_unlock_table(void) | |
196 | { | |
197 | if (atomic_dec_and_test(&nl_table_users)) | |
198 | wake_up(&nl_table_wait); | |
199 | } | |
200 | ||
201 | static __inline__ struct sock *netlink_lookup(int protocol, u32 pid) | |
202 | { | |
203 | struct nl_pid_hash *hash = &nl_table[protocol].hash; | |
204 | struct hlist_head *head; | |
205 | struct sock *sk; | |
206 | struct hlist_node *node; | |
207 | ||
208 | read_lock(&nl_table_lock); | |
209 | head = nl_pid_hashfn(hash, pid); | |
210 | sk_for_each(sk, node, head) { | |
211 | if (nlk_sk(sk)->pid == pid) { | |
212 | sock_hold(sk); | |
213 | goto found; | |
214 | } | |
215 | } | |
216 | sk = NULL; | |
217 | found: | |
218 | read_unlock(&nl_table_lock); | |
219 | return sk; | |
220 | } | |
221 | ||
222 | static inline struct hlist_head *nl_pid_hash_alloc(size_t size) | |
223 | { | |
224 | if (size <= PAGE_SIZE) | |
225 | return kmalloc(size, GFP_ATOMIC); | |
226 | else | |
227 | return (struct hlist_head *) | |
228 | __get_free_pages(GFP_ATOMIC, get_order(size)); | |
229 | } | |
230 | ||
231 | static inline void nl_pid_hash_free(struct hlist_head *table, size_t size) | |
232 | { | |
233 | if (size <= PAGE_SIZE) | |
234 | kfree(table); | |
235 | else | |
236 | free_pages((unsigned long)table, get_order(size)); | |
237 | } | |
238 | ||
239 | static int nl_pid_hash_rehash(struct nl_pid_hash *hash, int grow) | |
240 | { | |
241 | unsigned int omask, mask, shift; | |
242 | size_t osize, size; | |
243 | struct hlist_head *otable, *table; | |
244 | int i; | |
245 | ||
246 | omask = mask = hash->mask; | |
247 | osize = size = (mask + 1) * sizeof(*table); | |
248 | shift = hash->shift; | |
249 | ||
250 | if (grow) { | |
251 | if (++shift > hash->max_shift) | |
252 | return 0; | |
253 | mask = mask * 2 + 1; | |
254 | size *= 2; | |
255 | } | |
256 | ||
257 | table = nl_pid_hash_alloc(size); | |
258 | if (!table) | |
259 | return 0; | |
260 | ||
261 | memset(table, 0, size); | |
262 | otable = hash->table; | |
263 | hash->table = table; | |
264 | hash->mask = mask; | |
265 | hash->shift = shift; | |
266 | get_random_bytes(&hash->rnd, sizeof(hash->rnd)); | |
267 | ||
268 | for (i = 0; i <= omask; i++) { | |
269 | struct sock *sk; | |
270 | struct hlist_node *node, *tmp; | |
271 | ||
272 | sk_for_each_safe(sk, node, tmp, &otable[i]) | |
273 | __sk_add_node(sk, nl_pid_hashfn(hash, nlk_sk(sk)->pid)); | |
274 | } | |
275 | ||
276 | nl_pid_hash_free(otable, osize); | |
277 | hash->rehash_time = jiffies + 10 * 60 * HZ; | |
278 | return 1; | |
279 | } | |
280 | ||
281 | static inline int nl_pid_hash_dilute(struct nl_pid_hash *hash, int len) | |
282 | { | |
283 | int avg = hash->entries >> hash->shift; | |
284 | ||
285 | if (unlikely(avg > 1) && nl_pid_hash_rehash(hash, 1)) | |
286 | return 1; | |
287 | ||
288 | if (unlikely(len > avg) && time_after(jiffies, hash->rehash_time)) { | |
289 | nl_pid_hash_rehash(hash, 0); | |
290 | return 1; | |
291 | } | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
296 | static struct proto_ops netlink_ops; | |
297 | ||
298 | static int netlink_insert(struct sock *sk, u32 pid) | |
299 | { | |
300 | struct nl_pid_hash *hash = &nl_table[sk->sk_protocol].hash; | |
301 | struct hlist_head *head; | |
302 | int err = -EADDRINUSE; | |
303 | struct sock *osk; | |
304 | struct hlist_node *node; | |
305 | int len; | |
306 | ||
307 | netlink_table_grab(); | |
308 | head = nl_pid_hashfn(hash, pid); | |
309 | len = 0; | |
310 | sk_for_each(osk, node, head) { | |
311 | if (nlk_sk(osk)->pid == pid) | |
312 | break; | |
313 | len++; | |
314 | } | |
315 | if (node) | |
316 | goto err; | |
317 | ||
318 | err = -EBUSY; | |
319 | if (nlk_sk(sk)->pid) | |
320 | goto err; | |
321 | ||
322 | err = -ENOMEM; | |
323 | if (BITS_PER_LONG > 32 && unlikely(hash->entries >= UINT_MAX)) | |
324 | goto err; | |
325 | ||
326 | if (len && nl_pid_hash_dilute(hash, len)) | |
327 | head = nl_pid_hashfn(hash, pid); | |
328 | hash->entries++; | |
329 | nlk_sk(sk)->pid = pid; | |
330 | sk_add_node(sk, head); | |
331 | err = 0; | |
332 | ||
333 | err: | |
334 | netlink_table_ungrab(); | |
335 | return err; | |
336 | } | |
337 | ||
338 | static void netlink_remove(struct sock *sk) | |
339 | { | |
340 | netlink_table_grab(); | |
d470e3b4 DM |
341 | if (sk_del_node_init(sk)) |
342 | nl_table[sk->sk_protocol].hash.entries--; | |
f7fa9b10 | 343 | if (nlk_sk(sk)->subscriptions) |
1da177e4 LT |
344 | __sk_del_bind_node(sk); |
345 | netlink_table_ungrab(); | |
346 | } | |
347 | ||
348 | static struct proto netlink_proto = { | |
349 | .name = "NETLINK", | |
350 | .owner = THIS_MODULE, | |
351 | .obj_size = sizeof(struct netlink_sock), | |
352 | }; | |
353 | ||
ab33a171 | 354 | static int __netlink_create(struct socket *sock, int protocol) |
1da177e4 LT |
355 | { |
356 | struct sock *sk; | |
357 | struct netlink_sock *nlk; | |
ab33a171 PM |
358 | |
359 | sock->ops = &netlink_ops; | |
360 | ||
361 | sk = sk_alloc(PF_NETLINK, GFP_KERNEL, &netlink_proto, 1); | |
362 | if (!sk) | |
363 | return -ENOMEM; | |
364 | ||
365 | sock_init_data(sock, sk); | |
366 | ||
367 | nlk = nlk_sk(sk); | |
368 | spin_lock_init(&nlk->cb_lock); | |
369 | init_waitqueue_head(&nlk->wait); | |
370 | ||
371 | sk->sk_destruct = netlink_sock_destruct; | |
372 | sk->sk_protocol = protocol; | |
373 | return 0; | |
374 | } | |
375 | ||
376 | static int netlink_create(struct socket *sock, int protocol) | |
377 | { | |
378 | struct module *module = NULL; | |
f7fa9b10 PM |
379 | struct netlink_sock *nlk; |
380 | unsigned int groups; | |
ab33a171 | 381 | int err = 0; |
1da177e4 LT |
382 | |
383 | sock->state = SS_UNCONNECTED; | |
384 | ||
385 | if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) | |
386 | return -ESOCKTNOSUPPORT; | |
387 | ||
388 | if (protocol<0 || protocol >= MAX_LINKS) | |
389 | return -EPROTONOSUPPORT; | |
390 | ||
77247bbb | 391 | netlink_lock_table(); |
4fdb3bb7 | 392 | #ifdef CONFIG_KMOD |
ab33a171 | 393 | if (!nl_table[protocol].registered) { |
77247bbb | 394 | netlink_unlock_table(); |
4fdb3bb7 | 395 | request_module("net-pf-%d-proto-%d", PF_NETLINK, protocol); |
77247bbb | 396 | netlink_lock_table(); |
4fdb3bb7 | 397 | } |
ab33a171 PM |
398 | #endif |
399 | if (nl_table[protocol].registered && | |
400 | try_module_get(nl_table[protocol].module)) | |
401 | module = nl_table[protocol].module; | |
f7fa9b10 | 402 | groups = nl_table[protocol].groups; |
77247bbb | 403 | netlink_unlock_table(); |
4fdb3bb7 | 404 | |
513c2500 | 405 | if ((err = __netlink_create(sock, protocol) < 0)) |
f7fa9b10 PM |
406 | goto out_module; |
407 | ||
408 | nlk = nlk_sk(sock->sk); | |
f7fa9b10 | 409 | nlk->module = module; |
ab33a171 PM |
410 | out: |
411 | return err; | |
1da177e4 | 412 | |
ab33a171 PM |
413 | out_module: |
414 | module_put(module); | |
415 | goto out; | |
1da177e4 LT |
416 | } |
417 | ||
418 | static int netlink_release(struct socket *sock) | |
419 | { | |
420 | struct sock *sk = sock->sk; | |
421 | struct netlink_sock *nlk; | |
422 | ||
423 | if (!sk) | |
424 | return 0; | |
425 | ||
426 | netlink_remove(sk); | |
427 | nlk = nlk_sk(sk); | |
428 | ||
429 | spin_lock(&nlk->cb_lock); | |
430 | if (nlk->cb) { | |
a8f74b22 TG |
431 | if (nlk->cb->done) |
432 | nlk->cb->done(nlk->cb); | |
1da177e4 LT |
433 | netlink_destroy_callback(nlk->cb); |
434 | nlk->cb = NULL; | |
1da177e4 LT |
435 | } |
436 | spin_unlock(&nlk->cb_lock); | |
437 | ||
438 | /* OK. Socket is unlinked, and, therefore, | |
439 | no new packets will arrive */ | |
440 | ||
441 | sock_orphan(sk); | |
442 | sock->sk = NULL; | |
443 | wake_up_interruptible_all(&nlk->wait); | |
444 | ||
445 | skb_queue_purge(&sk->sk_write_queue); | |
446 | ||
f7fa9b10 | 447 | if (nlk->pid && !nlk->subscriptions) { |
1da177e4 LT |
448 | struct netlink_notify n = { |
449 | .protocol = sk->sk_protocol, | |
450 | .pid = nlk->pid, | |
451 | }; | |
452 | notifier_call_chain(&netlink_chain, NETLINK_URELEASE, &n); | |
453 | } | |
4fdb3bb7 | 454 | |
77247bbb PM |
455 | if (nlk->module) |
456 | module_put(nlk->module); | |
4fdb3bb7 | 457 | |
77247bbb | 458 | if (nlk->flags & NETLINK_KERNEL_SOCKET) { |
4fdb3bb7 | 459 | netlink_table_grab(); |
77247bbb | 460 | nl_table[sk->sk_protocol].module = NULL; |
ab33a171 | 461 | nl_table[sk->sk_protocol].registered = 0; |
4fdb3bb7 HW |
462 | netlink_table_ungrab(); |
463 | } | |
77247bbb | 464 | |
f7fa9b10 PM |
465 | kfree(nlk->groups); |
466 | nlk->groups = NULL; | |
467 | ||
1da177e4 LT |
468 | sock_put(sk); |
469 | return 0; | |
470 | } | |
471 | ||
472 | static int netlink_autobind(struct socket *sock) | |
473 | { | |
474 | struct sock *sk = sock->sk; | |
475 | struct nl_pid_hash *hash = &nl_table[sk->sk_protocol].hash; | |
476 | struct hlist_head *head; | |
477 | struct sock *osk; | |
478 | struct hlist_node *node; | |
c27bd492 | 479 | s32 pid = current->tgid; |
1da177e4 LT |
480 | int err; |
481 | static s32 rover = -4097; | |
482 | ||
483 | retry: | |
484 | cond_resched(); | |
485 | netlink_table_grab(); | |
486 | head = nl_pid_hashfn(hash, pid); | |
487 | sk_for_each(osk, node, head) { | |
488 | if (nlk_sk(osk)->pid == pid) { | |
489 | /* Bind collision, search negative pid values. */ | |
490 | pid = rover--; | |
491 | if (rover > -4097) | |
492 | rover = -4097; | |
493 | netlink_table_ungrab(); | |
494 | goto retry; | |
495 | } | |
496 | } | |
497 | netlink_table_ungrab(); | |
498 | ||
499 | err = netlink_insert(sk, pid); | |
500 | if (err == -EADDRINUSE) | |
501 | goto retry; | |
d470e3b4 DM |
502 | |
503 | /* If 2 threads race to autobind, that is fine. */ | |
504 | if (err == -EBUSY) | |
505 | err = 0; | |
506 | ||
507 | return err; | |
1da177e4 LT |
508 | } |
509 | ||
510 | static inline int netlink_capable(struct socket *sock, unsigned int flag) | |
511 | { | |
512 | return (nl_table[sock->sk->sk_protocol].nl_nonroot & flag) || | |
513 | capable(CAP_NET_ADMIN); | |
514 | } | |
515 | ||
f7fa9b10 PM |
516 | static void |
517 | netlink_update_subscriptions(struct sock *sk, unsigned int subscriptions) | |
518 | { | |
519 | struct netlink_sock *nlk = nlk_sk(sk); | |
520 | ||
521 | if (nlk->subscriptions && !subscriptions) | |
522 | __sk_del_bind_node(sk); | |
523 | else if (!nlk->subscriptions && subscriptions) | |
524 | sk_add_bind_node(sk, &nl_table[sk->sk_protocol].mc_list); | |
525 | nlk->subscriptions = subscriptions; | |
526 | } | |
527 | ||
513c2500 PM |
528 | static int netlink_alloc_groups(struct sock *sk) |
529 | { | |
530 | struct netlink_sock *nlk = nlk_sk(sk); | |
531 | unsigned int groups; | |
532 | int err = 0; | |
533 | ||
534 | netlink_lock_table(); | |
535 | groups = nl_table[sk->sk_protocol].groups; | |
536 | if (!nl_table[sk->sk_protocol].registered) | |
537 | err = -ENOENT; | |
538 | netlink_unlock_table(); | |
539 | ||
540 | if (err) | |
541 | return err; | |
542 | ||
543 | nlk->groups = kmalloc(NLGRPSZ(groups), GFP_KERNEL); | |
544 | if (nlk->groups == NULL) | |
545 | return -ENOMEM; | |
546 | memset(nlk->groups, 0, NLGRPSZ(groups)); | |
547 | nlk->ngroups = groups; | |
548 | return 0; | |
549 | } | |
550 | ||
1da177e4 LT |
551 | static int netlink_bind(struct socket *sock, struct sockaddr *addr, int addr_len) |
552 | { | |
553 | struct sock *sk = sock->sk; | |
554 | struct netlink_sock *nlk = nlk_sk(sk); | |
555 | struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr; | |
556 | int err; | |
557 | ||
558 | if (nladdr->nl_family != AF_NETLINK) | |
559 | return -EINVAL; | |
560 | ||
561 | /* Only superuser is allowed to listen multicasts */ | |
513c2500 PM |
562 | if (nladdr->nl_groups) { |
563 | if (!netlink_capable(sock, NL_NONROOT_RECV)) | |
564 | return -EPERM; | |
565 | if (nlk->groups == NULL) { | |
566 | err = netlink_alloc_groups(sk); | |
567 | if (err) | |
568 | return err; | |
569 | } | |
570 | } | |
1da177e4 LT |
571 | |
572 | if (nlk->pid) { | |
573 | if (nladdr->nl_pid != nlk->pid) | |
574 | return -EINVAL; | |
575 | } else { | |
576 | err = nladdr->nl_pid ? | |
577 | netlink_insert(sk, nladdr->nl_pid) : | |
578 | netlink_autobind(sock); | |
579 | if (err) | |
580 | return err; | |
581 | } | |
582 | ||
513c2500 | 583 | if (!nladdr->nl_groups && (nlk->groups == NULL || !(u32)nlk->groups[0])) |
1da177e4 LT |
584 | return 0; |
585 | ||
586 | netlink_table_grab(); | |
f7fa9b10 PM |
587 | netlink_update_subscriptions(sk, nlk->subscriptions + |
588 | hweight32(nladdr->nl_groups) - | |
589 | hweight32(nlk->groups[0])); | |
590 | nlk->groups[0] = (nlk->groups[0] & ~0xffffffffUL) | nladdr->nl_groups; | |
1da177e4 LT |
591 | netlink_table_ungrab(); |
592 | ||
593 | return 0; | |
594 | } | |
595 | ||
596 | static int netlink_connect(struct socket *sock, struct sockaddr *addr, | |
597 | int alen, int flags) | |
598 | { | |
599 | int err = 0; | |
600 | struct sock *sk = sock->sk; | |
601 | struct netlink_sock *nlk = nlk_sk(sk); | |
602 | struct sockaddr_nl *nladdr=(struct sockaddr_nl*)addr; | |
603 | ||
604 | if (addr->sa_family == AF_UNSPEC) { | |
605 | sk->sk_state = NETLINK_UNCONNECTED; | |
606 | nlk->dst_pid = 0; | |
d629b836 | 607 | nlk->dst_group = 0; |
1da177e4 LT |
608 | return 0; |
609 | } | |
610 | if (addr->sa_family != AF_NETLINK) | |
611 | return -EINVAL; | |
612 | ||
613 | /* Only superuser is allowed to send multicasts */ | |
614 | if (nladdr->nl_groups && !netlink_capable(sock, NL_NONROOT_SEND)) | |
615 | return -EPERM; | |
616 | ||
617 | if (!nlk->pid) | |
618 | err = netlink_autobind(sock); | |
619 | ||
620 | if (err == 0) { | |
621 | sk->sk_state = NETLINK_CONNECTED; | |
622 | nlk->dst_pid = nladdr->nl_pid; | |
d629b836 | 623 | nlk->dst_group = ffs(nladdr->nl_groups); |
1da177e4 LT |
624 | } |
625 | ||
626 | return err; | |
627 | } | |
628 | ||
629 | static int netlink_getname(struct socket *sock, struct sockaddr *addr, int *addr_len, int peer) | |
630 | { | |
631 | struct sock *sk = sock->sk; | |
632 | struct netlink_sock *nlk = nlk_sk(sk); | |
633 | struct sockaddr_nl *nladdr=(struct sockaddr_nl *)addr; | |
634 | ||
635 | nladdr->nl_family = AF_NETLINK; | |
636 | nladdr->nl_pad = 0; | |
637 | *addr_len = sizeof(*nladdr); | |
638 | ||
639 | if (peer) { | |
640 | nladdr->nl_pid = nlk->dst_pid; | |
d629b836 | 641 | nladdr->nl_groups = netlink_group_mask(nlk->dst_group); |
1da177e4 LT |
642 | } else { |
643 | nladdr->nl_pid = nlk->pid; | |
513c2500 | 644 | nladdr->nl_groups = nlk->groups ? nlk->groups[0] : 0; |
1da177e4 LT |
645 | } |
646 | return 0; | |
647 | } | |
648 | ||
649 | static void netlink_overrun(struct sock *sk) | |
650 | { | |
651 | if (!test_and_set_bit(0, &nlk_sk(sk)->state)) { | |
652 | sk->sk_err = ENOBUFS; | |
653 | sk->sk_error_report(sk); | |
654 | } | |
655 | } | |
656 | ||
657 | static struct sock *netlink_getsockbypid(struct sock *ssk, u32 pid) | |
658 | { | |
659 | int protocol = ssk->sk_protocol; | |
660 | struct sock *sock; | |
661 | struct netlink_sock *nlk; | |
662 | ||
663 | sock = netlink_lookup(protocol, pid); | |
664 | if (!sock) | |
665 | return ERR_PTR(-ECONNREFUSED); | |
666 | ||
667 | /* Don't bother queuing skb if kernel socket has no input function */ | |
668 | nlk = nlk_sk(sock); | |
669 | if ((nlk->pid == 0 && !nlk->data_ready) || | |
670 | (sock->sk_state == NETLINK_CONNECTED && | |
671 | nlk->dst_pid != nlk_sk(ssk)->pid)) { | |
672 | sock_put(sock); | |
673 | return ERR_PTR(-ECONNREFUSED); | |
674 | } | |
675 | return sock; | |
676 | } | |
677 | ||
678 | struct sock *netlink_getsockbyfilp(struct file *filp) | |
679 | { | |
680 | struct inode *inode = filp->f_dentry->d_inode; | |
681 | struct sock *sock; | |
682 | ||
683 | if (!S_ISSOCK(inode->i_mode)) | |
684 | return ERR_PTR(-ENOTSOCK); | |
685 | ||
686 | sock = SOCKET_I(inode)->sk; | |
687 | if (sock->sk_family != AF_NETLINK) | |
688 | return ERR_PTR(-EINVAL); | |
689 | ||
690 | sock_hold(sock); | |
691 | return sock; | |
692 | } | |
693 | ||
694 | /* | |
695 | * Attach a skb to a netlink socket. | |
696 | * The caller must hold a reference to the destination socket. On error, the | |
697 | * reference is dropped. The skb is not send to the destination, just all | |
698 | * all error checks are performed and memory in the queue is reserved. | |
699 | * Return values: | |
700 | * < 0: error. skb freed, reference to sock dropped. | |
701 | * 0: continue | |
702 | * 1: repeat lookup - reference dropped while waiting for socket memory. | |
703 | */ | |
704 | int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, long timeo) | |
705 | { | |
706 | struct netlink_sock *nlk; | |
707 | ||
708 | nlk = nlk_sk(sk); | |
709 | ||
710 | if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf || | |
711 | test_bit(0, &nlk->state)) { | |
712 | DECLARE_WAITQUEUE(wait, current); | |
713 | if (!timeo) { | |
714 | if (!nlk->pid) | |
715 | netlink_overrun(sk); | |
716 | sock_put(sk); | |
717 | kfree_skb(skb); | |
718 | return -EAGAIN; | |
719 | } | |
720 | ||
721 | __set_current_state(TASK_INTERRUPTIBLE); | |
722 | add_wait_queue(&nlk->wait, &wait); | |
723 | ||
724 | if ((atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf || | |
725 | test_bit(0, &nlk->state)) && | |
726 | !sock_flag(sk, SOCK_DEAD)) | |
727 | timeo = schedule_timeout(timeo); | |
728 | ||
729 | __set_current_state(TASK_RUNNING); | |
730 | remove_wait_queue(&nlk->wait, &wait); | |
731 | sock_put(sk); | |
732 | ||
733 | if (signal_pending(current)) { | |
734 | kfree_skb(skb); | |
735 | return sock_intr_errno(timeo); | |
736 | } | |
737 | return 1; | |
738 | } | |
739 | skb_set_owner_r(skb, sk); | |
740 | return 0; | |
741 | } | |
742 | ||
743 | int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol) | |
744 | { | |
1da177e4 LT |
745 | int len = skb->len; |
746 | ||
1da177e4 LT |
747 | skb_queue_tail(&sk->sk_receive_queue, skb); |
748 | sk->sk_data_ready(sk, len); | |
749 | sock_put(sk); | |
750 | return len; | |
751 | } | |
752 | ||
753 | void netlink_detachskb(struct sock *sk, struct sk_buff *skb) | |
754 | { | |
755 | kfree_skb(skb); | |
756 | sock_put(sk); | |
757 | } | |
758 | ||
37da647d | 759 | static inline struct sk_buff *netlink_trim(struct sk_buff *skb, |
dd0fc66f | 760 | gfp_t allocation) |
1da177e4 LT |
761 | { |
762 | int delta; | |
763 | ||
764 | skb_orphan(skb); | |
765 | ||
766 | delta = skb->end - skb->tail; | |
767 | if (delta * 2 < skb->truesize) | |
768 | return skb; | |
769 | ||
770 | if (skb_shared(skb)) { | |
771 | struct sk_buff *nskb = skb_clone(skb, allocation); | |
772 | if (!nskb) | |
773 | return skb; | |
774 | kfree_skb(skb); | |
775 | skb = nskb; | |
776 | } | |
777 | ||
778 | if (!pskb_expand_head(skb, 0, -delta, allocation)) | |
779 | skb->truesize -= delta; | |
780 | ||
781 | return skb; | |
782 | } | |
783 | ||
784 | int netlink_unicast(struct sock *ssk, struct sk_buff *skb, u32 pid, int nonblock) | |
785 | { | |
786 | struct sock *sk; | |
787 | int err; | |
788 | long timeo; | |
789 | ||
790 | skb = netlink_trim(skb, gfp_any()); | |
791 | ||
792 | timeo = sock_sndtimeo(ssk, nonblock); | |
793 | retry: | |
794 | sk = netlink_getsockbypid(ssk, pid); | |
795 | if (IS_ERR(sk)) { | |
796 | kfree_skb(skb); | |
797 | return PTR_ERR(sk); | |
798 | } | |
799 | err = netlink_attachskb(sk, skb, nonblock, timeo); | |
800 | if (err == 1) | |
801 | goto retry; | |
802 | if (err) | |
803 | return err; | |
804 | ||
805 | return netlink_sendskb(sk, skb, ssk->sk_protocol); | |
806 | } | |
807 | ||
808 | static __inline__ int netlink_broadcast_deliver(struct sock *sk, struct sk_buff *skb) | |
809 | { | |
810 | struct netlink_sock *nlk = nlk_sk(sk); | |
811 | ||
812 | if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf && | |
813 | !test_bit(0, &nlk->state)) { | |
814 | skb_set_owner_r(skb, sk); | |
815 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
816 | sk->sk_data_ready(sk, skb->len); | |
817 | return atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf; | |
818 | } | |
819 | return -1; | |
820 | } | |
821 | ||
822 | struct netlink_broadcast_data { | |
823 | struct sock *exclude_sk; | |
824 | u32 pid; | |
825 | u32 group; | |
826 | int failure; | |
827 | int congested; | |
828 | int delivered; | |
7d877f3b | 829 | gfp_t allocation; |
1da177e4 LT |
830 | struct sk_buff *skb, *skb2; |
831 | }; | |
832 | ||
833 | static inline int do_one_broadcast(struct sock *sk, | |
834 | struct netlink_broadcast_data *p) | |
835 | { | |
836 | struct netlink_sock *nlk = nlk_sk(sk); | |
837 | int val; | |
838 | ||
839 | if (p->exclude_sk == sk) | |
840 | goto out; | |
841 | ||
f7fa9b10 PM |
842 | if (nlk->pid == p->pid || p->group - 1 >= nlk->ngroups || |
843 | !test_bit(p->group - 1, nlk->groups)) | |
1da177e4 LT |
844 | goto out; |
845 | ||
846 | if (p->failure) { | |
847 | netlink_overrun(sk); | |
848 | goto out; | |
849 | } | |
850 | ||
851 | sock_hold(sk); | |
852 | if (p->skb2 == NULL) { | |
68acc024 | 853 | if (skb_shared(p->skb)) { |
1da177e4 LT |
854 | p->skb2 = skb_clone(p->skb, p->allocation); |
855 | } else { | |
68acc024 TC |
856 | p->skb2 = skb_get(p->skb); |
857 | /* | |
858 | * skb ownership may have been set when | |
859 | * delivered to a previous socket. | |
860 | */ | |
861 | skb_orphan(p->skb2); | |
1da177e4 LT |
862 | } |
863 | } | |
864 | if (p->skb2 == NULL) { | |
865 | netlink_overrun(sk); | |
866 | /* Clone failed. Notify ALL listeners. */ | |
867 | p->failure = 1; | |
868 | } else if ((val = netlink_broadcast_deliver(sk, p->skb2)) < 0) { | |
869 | netlink_overrun(sk); | |
870 | } else { | |
871 | p->congested |= val; | |
872 | p->delivered = 1; | |
873 | p->skb2 = NULL; | |
874 | } | |
875 | sock_put(sk); | |
876 | ||
877 | out: | |
878 | return 0; | |
879 | } | |
880 | ||
881 | int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, u32 pid, | |
dd0fc66f | 882 | u32 group, gfp_t allocation) |
1da177e4 LT |
883 | { |
884 | struct netlink_broadcast_data info; | |
885 | struct hlist_node *node; | |
886 | struct sock *sk; | |
887 | ||
888 | skb = netlink_trim(skb, allocation); | |
889 | ||
890 | info.exclude_sk = ssk; | |
891 | info.pid = pid; | |
892 | info.group = group; | |
893 | info.failure = 0; | |
894 | info.congested = 0; | |
895 | info.delivered = 0; | |
896 | info.allocation = allocation; | |
897 | info.skb = skb; | |
898 | info.skb2 = NULL; | |
899 | ||
900 | /* While we sleep in clone, do not allow to change socket list */ | |
901 | ||
902 | netlink_lock_table(); | |
903 | ||
904 | sk_for_each_bound(sk, node, &nl_table[ssk->sk_protocol].mc_list) | |
905 | do_one_broadcast(sk, &info); | |
906 | ||
aa1c6a6f TC |
907 | kfree_skb(skb); |
908 | ||
1da177e4 LT |
909 | netlink_unlock_table(); |
910 | ||
911 | if (info.skb2) | |
912 | kfree_skb(info.skb2); | |
1da177e4 LT |
913 | |
914 | if (info.delivered) { | |
915 | if (info.congested && (allocation & __GFP_WAIT)) | |
916 | yield(); | |
917 | return 0; | |
918 | } | |
919 | if (info.failure) | |
920 | return -ENOBUFS; | |
921 | return -ESRCH; | |
922 | } | |
923 | ||
924 | struct netlink_set_err_data { | |
925 | struct sock *exclude_sk; | |
926 | u32 pid; | |
927 | u32 group; | |
928 | int code; | |
929 | }; | |
930 | ||
931 | static inline int do_one_set_err(struct sock *sk, | |
932 | struct netlink_set_err_data *p) | |
933 | { | |
934 | struct netlink_sock *nlk = nlk_sk(sk); | |
935 | ||
936 | if (sk == p->exclude_sk) | |
937 | goto out; | |
938 | ||
f7fa9b10 PM |
939 | if (nlk->pid == p->pid || p->group - 1 >= nlk->ngroups || |
940 | !test_bit(p->group - 1, nlk->groups)) | |
1da177e4 LT |
941 | goto out; |
942 | ||
943 | sk->sk_err = p->code; | |
944 | sk->sk_error_report(sk); | |
945 | out: | |
946 | return 0; | |
947 | } | |
948 | ||
949 | void netlink_set_err(struct sock *ssk, u32 pid, u32 group, int code) | |
950 | { | |
951 | struct netlink_set_err_data info; | |
952 | struct hlist_node *node; | |
953 | struct sock *sk; | |
954 | ||
955 | info.exclude_sk = ssk; | |
956 | info.pid = pid; | |
957 | info.group = group; | |
958 | info.code = code; | |
959 | ||
960 | read_lock(&nl_table_lock); | |
961 | ||
962 | sk_for_each_bound(sk, node, &nl_table[ssk->sk_protocol].mc_list) | |
963 | do_one_set_err(sk, &info); | |
964 | ||
965 | read_unlock(&nl_table_lock); | |
966 | } | |
967 | ||
9a4595bc PM |
968 | static int netlink_setsockopt(struct socket *sock, int level, int optname, |
969 | char __user *optval, int optlen) | |
970 | { | |
971 | struct sock *sk = sock->sk; | |
972 | struct netlink_sock *nlk = nlk_sk(sk); | |
973 | int val = 0, err; | |
974 | ||
975 | if (level != SOL_NETLINK) | |
976 | return -ENOPROTOOPT; | |
977 | ||
978 | if (optlen >= sizeof(int) && | |
979 | get_user(val, (int __user *)optval)) | |
980 | return -EFAULT; | |
981 | ||
982 | switch (optname) { | |
983 | case NETLINK_PKTINFO: | |
984 | if (val) | |
985 | nlk->flags |= NETLINK_RECV_PKTINFO; | |
986 | else | |
987 | nlk->flags &= ~NETLINK_RECV_PKTINFO; | |
988 | err = 0; | |
989 | break; | |
990 | case NETLINK_ADD_MEMBERSHIP: | |
991 | case NETLINK_DROP_MEMBERSHIP: { | |
992 | unsigned int subscriptions; | |
993 | int old, new = optname == NETLINK_ADD_MEMBERSHIP ? 1 : 0; | |
994 | ||
995 | if (!netlink_capable(sock, NL_NONROOT_RECV)) | |
996 | return -EPERM; | |
513c2500 PM |
997 | if (nlk->groups == NULL) { |
998 | err = netlink_alloc_groups(sk); | |
999 | if (err) | |
1000 | return err; | |
1001 | } | |
9a4595bc PM |
1002 | if (!val || val - 1 >= nlk->ngroups) |
1003 | return -EINVAL; | |
1004 | netlink_table_grab(); | |
1005 | old = test_bit(val - 1, nlk->groups); | |
1006 | subscriptions = nlk->subscriptions - old + new; | |
1007 | if (new) | |
1008 | __set_bit(val - 1, nlk->groups); | |
1009 | else | |
1010 | __clear_bit(val - 1, nlk->groups); | |
1011 | netlink_update_subscriptions(sk, subscriptions); | |
1012 | netlink_table_ungrab(); | |
1013 | err = 0; | |
1014 | break; | |
1015 | } | |
1016 | default: | |
1017 | err = -ENOPROTOOPT; | |
1018 | } | |
1019 | return err; | |
1020 | } | |
1021 | ||
1022 | static int netlink_getsockopt(struct socket *sock, int level, int optname, | |
1023 | char __user *optval, int __user *optlen) | |
1024 | { | |
1025 | struct sock *sk = sock->sk; | |
1026 | struct netlink_sock *nlk = nlk_sk(sk); | |
1027 | int len, val, err; | |
1028 | ||
1029 | if (level != SOL_NETLINK) | |
1030 | return -ENOPROTOOPT; | |
1031 | ||
1032 | if (get_user(len, optlen)) | |
1033 | return -EFAULT; | |
1034 | if (len < 0) | |
1035 | return -EINVAL; | |
1036 | ||
1037 | switch (optname) { | |
1038 | case NETLINK_PKTINFO: | |
1039 | if (len < sizeof(int)) | |
1040 | return -EINVAL; | |
1041 | len = sizeof(int); | |
1042 | val = nlk->flags & NETLINK_RECV_PKTINFO ? 1 : 0; | |
1043 | put_user(len, optlen); | |
1044 | put_user(val, optval); | |
1045 | err = 0; | |
1046 | break; | |
1047 | default: | |
1048 | err = -ENOPROTOOPT; | |
1049 | } | |
1050 | return err; | |
1051 | } | |
1052 | ||
1053 | static void netlink_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) | |
1054 | { | |
1055 | struct nl_pktinfo info; | |
1056 | ||
1057 | info.group = NETLINK_CB(skb).dst_group; | |
1058 | put_cmsg(msg, SOL_NETLINK, NETLINK_PKTINFO, sizeof(info), &info); | |
1059 | } | |
1060 | ||
1da177e4 LT |
1061 | static inline void netlink_rcv_wake(struct sock *sk) |
1062 | { | |
1063 | struct netlink_sock *nlk = nlk_sk(sk); | |
1064 | ||
b03efcfb | 1065 | if (skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
1066 | clear_bit(0, &nlk->state); |
1067 | if (!test_bit(0, &nlk->state)) | |
1068 | wake_up_interruptible(&nlk->wait); | |
1069 | } | |
1070 | ||
1071 | static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
1072 | struct msghdr *msg, size_t len) | |
1073 | { | |
1074 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); | |
1075 | struct sock *sk = sock->sk; | |
1076 | struct netlink_sock *nlk = nlk_sk(sk); | |
1077 | struct sockaddr_nl *addr=msg->msg_name; | |
1078 | u32 dst_pid; | |
d629b836 | 1079 | u32 dst_group; |
1da177e4 LT |
1080 | struct sk_buff *skb; |
1081 | int err; | |
1082 | struct scm_cookie scm; | |
1083 | ||
1084 | if (msg->msg_flags&MSG_OOB) | |
1085 | return -EOPNOTSUPP; | |
1086 | ||
1087 | if (NULL == siocb->scm) | |
1088 | siocb->scm = &scm; | |
1089 | err = scm_send(sock, msg, siocb->scm); | |
1090 | if (err < 0) | |
1091 | return err; | |
1092 | ||
1093 | if (msg->msg_namelen) { | |
1094 | if (addr->nl_family != AF_NETLINK) | |
1095 | return -EINVAL; | |
1096 | dst_pid = addr->nl_pid; | |
d629b836 PM |
1097 | dst_group = ffs(addr->nl_groups); |
1098 | if (dst_group && !netlink_capable(sock, NL_NONROOT_SEND)) | |
1da177e4 LT |
1099 | return -EPERM; |
1100 | } else { | |
1101 | dst_pid = nlk->dst_pid; | |
d629b836 | 1102 | dst_group = nlk->dst_group; |
1da177e4 LT |
1103 | } |
1104 | ||
1105 | if (!nlk->pid) { | |
1106 | err = netlink_autobind(sock); | |
1107 | if (err) | |
1108 | goto out; | |
1109 | } | |
1110 | ||
1111 | err = -EMSGSIZE; | |
1112 | if (len > sk->sk_sndbuf - 32) | |
1113 | goto out; | |
1114 | err = -ENOBUFS; | |
1115 | skb = alloc_skb(len, GFP_KERNEL); | |
1116 | if (skb==NULL) | |
1117 | goto out; | |
1118 | ||
1119 | NETLINK_CB(skb).pid = nlk->pid; | |
1da177e4 | 1120 | NETLINK_CB(skb).dst_pid = dst_pid; |
d629b836 | 1121 | NETLINK_CB(skb).dst_group = dst_group; |
c94c257c | 1122 | NETLINK_CB(skb).loginuid = audit_get_loginuid(current->audit_context); |
1da177e4 LT |
1123 | memcpy(NETLINK_CREDS(skb), &siocb->scm->creds, sizeof(struct ucred)); |
1124 | ||
1125 | /* What can I do? Netlink is asynchronous, so that | |
1126 | we will have to save current capabilities to | |
1127 | check them, when this message will be delivered | |
1128 | to corresponding kernel module. --ANK (980802) | |
1129 | */ | |
1130 | ||
1131 | err = -EFAULT; | |
1132 | if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len)) { | |
1133 | kfree_skb(skb); | |
1134 | goto out; | |
1135 | } | |
1136 | ||
1137 | err = security_netlink_send(sk, skb); | |
1138 | if (err) { | |
1139 | kfree_skb(skb); | |
1140 | goto out; | |
1141 | } | |
1142 | ||
d629b836 | 1143 | if (dst_group) { |
1da177e4 | 1144 | atomic_inc(&skb->users); |
d629b836 | 1145 | netlink_broadcast(sk, skb, dst_pid, dst_group, GFP_KERNEL); |
1da177e4 LT |
1146 | } |
1147 | err = netlink_unicast(sk, skb, dst_pid, msg->msg_flags&MSG_DONTWAIT); | |
1148 | ||
1149 | out: | |
1150 | return err; | |
1151 | } | |
1152 | ||
1153 | static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock, | |
1154 | struct msghdr *msg, size_t len, | |
1155 | int flags) | |
1156 | { | |
1157 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); | |
1158 | struct scm_cookie scm; | |
1159 | struct sock *sk = sock->sk; | |
1160 | struct netlink_sock *nlk = nlk_sk(sk); | |
1161 | int noblock = flags&MSG_DONTWAIT; | |
1162 | size_t copied; | |
1163 | struct sk_buff *skb; | |
1164 | int err; | |
1165 | ||
1166 | if (flags&MSG_OOB) | |
1167 | return -EOPNOTSUPP; | |
1168 | ||
1169 | copied = 0; | |
1170 | ||
1171 | skb = skb_recv_datagram(sk,flags,noblock,&err); | |
1172 | if (skb==NULL) | |
1173 | goto out; | |
1174 | ||
1175 | msg->msg_namelen = 0; | |
1176 | ||
1177 | copied = skb->len; | |
1178 | if (len < copied) { | |
1179 | msg->msg_flags |= MSG_TRUNC; | |
1180 | copied = len; | |
1181 | } | |
1182 | ||
1183 | skb->h.raw = skb->data; | |
1184 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1185 | ||
1186 | if (msg->msg_name) { | |
1187 | struct sockaddr_nl *addr = (struct sockaddr_nl*)msg->msg_name; | |
1188 | addr->nl_family = AF_NETLINK; | |
1189 | addr->nl_pad = 0; | |
1190 | addr->nl_pid = NETLINK_CB(skb).pid; | |
d629b836 | 1191 | addr->nl_groups = netlink_group_mask(NETLINK_CB(skb).dst_group); |
1da177e4 LT |
1192 | msg->msg_namelen = sizeof(*addr); |
1193 | } | |
1194 | ||
1195 | if (NULL == siocb->scm) { | |
1196 | memset(&scm, 0, sizeof(scm)); | |
1197 | siocb->scm = &scm; | |
1198 | } | |
1199 | siocb->scm->creds = *NETLINK_CREDS(skb); | |
1200 | skb_free_datagram(sk, skb); | |
1201 | ||
1202 | if (nlk->cb && atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf / 2) | |
1203 | netlink_dump(sk); | |
1204 | ||
1205 | scm_recv(sock, msg, siocb->scm, flags); | |
9a4595bc PM |
1206 | if (nlk->flags & NETLINK_RECV_PKTINFO) |
1207 | netlink_cmsg_recv_pktinfo(msg, skb); | |
1da177e4 LT |
1208 | |
1209 | out: | |
1210 | netlink_rcv_wake(sk); | |
1211 | return err ? : copied; | |
1212 | } | |
1213 | ||
1214 | static void netlink_data_ready(struct sock *sk, int len) | |
1215 | { | |
1216 | struct netlink_sock *nlk = nlk_sk(sk); | |
1217 | ||
1218 | if (nlk->data_ready) | |
1219 | nlk->data_ready(sk, len); | |
1220 | netlink_rcv_wake(sk); | |
1221 | } | |
1222 | ||
1223 | /* | |
1224 | * We export these functions to other modules. They provide a | |
1225 | * complete set of kernel non-blocking support for message | |
1226 | * queueing. | |
1227 | */ | |
1228 | ||
1229 | struct sock * | |
06628607 PM |
1230 | netlink_kernel_create(int unit, unsigned int groups, |
1231 | void (*input)(struct sock *sk, int len), | |
1232 | struct module *module) | |
1da177e4 LT |
1233 | { |
1234 | struct socket *sock; | |
1235 | struct sock *sk; | |
77247bbb | 1236 | struct netlink_sock *nlk; |
1da177e4 LT |
1237 | |
1238 | if (!nl_table) | |
1239 | return NULL; | |
1240 | ||
1241 | if (unit<0 || unit>=MAX_LINKS) | |
1242 | return NULL; | |
1243 | ||
1244 | if (sock_create_lite(PF_NETLINK, SOCK_DGRAM, unit, &sock)) | |
1245 | return NULL; | |
1246 | ||
ab33a171 | 1247 | if (__netlink_create(sock, unit) < 0) |
77247bbb | 1248 | goto out_sock_release; |
4fdb3bb7 | 1249 | |
1da177e4 LT |
1250 | sk = sock->sk; |
1251 | sk->sk_data_ready = netlink_data_ready; | |
1252 | if (input) | |
1253 | nlk_sk(sk)->data_ready = input; | |
1254 | ||
77247bbb PM |
1255 | if (netlink_insert(sk, 0)) |
1256 | goto out_sock_release; | |
4fdb3bb7 | 1257 | |
77247bbb PM |
1258 | nlk = nlk_sk(sk); |
1259 | nlk->flags |= NETLINK_KERNEL_SOCKET; | |
4fdb3bb7 | 1260 | |
4fdb3bb7 | 1261 | netlink_table_grab(); |
06628607 | 1262 | nl_table[unit].groups = groups < 32 ? 32 : groups; |
77247bbb | 1263 | nl_table[unit].module = module; |
ab33a171 | 1264 | nl_table[unit].registered = 1; |
4fdb3bb7 | 1265 | netlink_table_ungrab(); |
77247bbb PM |
1266 | |
1267 | return sk; | |
1268 | ||
4fdb3bb7 HW |
1269 | out_sock_release: |
1270 | sock_release(sock); | |
77247bbb | 1271 | return NULL; |
1da177e4 LT |
1272 | } |
1273 | ||
1274 | void netlink_set_nonroot(int protocol, unsigned int flags) | |
1275 | { | |
1276 | if ((unsigned int)protocol < MAX_LINKS) | |
1277 | nl_table[protocol].nl_nonroot = flags; | |
1278 | } | |
1279 | ||
1280 | static void netlink_destroy_callback(struct netlink_callback *cb) | |
1281 | { | |
1282 | if (cb->skb) | |
1283 | kfree_skb(cb->skb); | |
1284 | kfree(cb); | |
1285 | } | |
1286 | ||
1287 | /* | |
1288 | * It looks a bit ugly. | |
1289 | * It would be better to create kernel thread. | |
1290 | */ | |
1291 | ||
1292 | static int netlink_dump(struct sock *sk) | |
1293 | { | |
1294 | struct netlink_sock *nlk = nlk_sk(sk); | |
1295 | struct netlink_callback *cb; | |
1296 | struct sk_buff *skb; | |
1297 | struct nlmsghdr *nlh; | |
1298 | int len; | |
1299 | ||
1300 | skb = sock_rmalloc(sk, NLMSG_GOODSIZE, 0, GFP_KERNEL); | |
1301 | if (!skb) | |
1302 | return -ENOBUFS; | |
1303 | ||
1304 | spin_lock(&nlk->cb_lock); | |
1305 | ||
1306 | cb = nlk->cb; | |
1307 | if (cb == NULL) { | |
1308 | spin_unlock(&nlk->cb_lock); | |
1309 | kfree_skb(skb); | |
1310 | return -EINVAL; | |
1311 | } | |
1312 | ||
1313 | len = cb->dump(skb, cb); | |
1314 | ||
1315 | if (len > 0) { | |
1316 | spin_unlock(&nlk->cb_lock); | |
1317 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
1318 | sk->sk_data_ready(sk, len); | |
1319 | return 0; | |
1320 | } | |
1321 | ||
1797754e | 1322 | nlh = NLMSG_NEW_ANSWER(skb, cb, NLMSG_DONE, sizeof(len), NLM_F_MULTI); |
1da177e4 LT |
1323 | memcpy(NLMSG_DATA(nlh), &len, sizeof(len)); |
1324 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
1325 | sk->sk_data_ready(sk, skb->len); | |
1326 | ||
a8f74b22 TG |
1327 | if (cb->done) |
1328 | cb->done(cb); | |
1da177e4 LT |
1329 | nlk->cb = NULL; |
1330 | spin_unlock(&nlk->cb_lock); | |
1331 | ||
1332 | netlink_destroy_callback(cb); | |
1da177e4 | 1333 | return 0; |
1797754e TG |
1334 | |
1335 | nlmsg_failure: | |
1336 | return -ENOBUFS; | |
1da177e4 LT |
1337 | } |
1338 | ||
1339 | int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, | |
1340 | struct nlmsghdr *nlh, | |
1341 | int (*dump)(struct sk_buff *skb, struct netlink_callback*), | |
1342 | int (*done)(struct netlink_callback*)) | |
1343 | { | |
1344 | struct netlink_callback *cb; | |
1345 | struct sock *sk; | |
1346 | struct netlink_sock *nlk; | |
1347 | ||
1348 | cb = kmalloc(sizeof(*cb), GFP_KERNEL); | |
1349 | if (cb == NULL) | |
1350 | return -ENOBUFS; | |
1351 | ||
1352 | memset(cb, 0, sizeof(*cb)); | |
1353 | cb->dump = dump; | |
1354 | cb->done = done; | |
1355 | cb->nlh = nlh; | |
1356 | atomic_inc(&skb->users); | |
1357 | cb->skb = skb; | |
1358 | ||
1359 | sk = netlink_lookup(ssk->sk_protocol, NETLINK_CB(skb).pid); | |
1360 | if (sk == NULL) { | |
1361 | netlink_destroy_callback(cb); | |
1362 | return -ECONNREFUSED; | |
1363 | } | |
1364 | nlk = nlk_sk(sk); | |
1365 | /* A dump is in progress... */ | |
1366 | spin_lock(&nlk->cb_lock); | |
1367 | if (nlk->cb) { | |
1368 | spin_unlock(&nlk->cb_lock); | |
1369 | netlink_destroy_callback(cb); | |
1370 | sock_put(sk); | |
1371 | return -EBUSY; | |
1372 | } | |
1373 | nlk->cb = cb; | |
1da177e4 LT |
1374 | spin_unlock(&nlk->cb_lock); |
1375 | ||
1376 | netlink_dump(sk); | |
1377 | sock_put(sk); | |
1378 | return 0; | |
1379 | } | |
1380 | ||
1381 | void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err) | |
1382 | { | |
1383 | struct sk_buff *skb; | |
1384 | struct nlmsghdr *rep; | |
1385 | struct nlmsgerr *errmsg; | |
1386 | int size; | |
1387 | ||
1388 | if (err == 0) | |
1389 | size = NLMSG_SPACE(sizeof(struct nlmsgerr)); | |
1390 | else | |
1391 | size = NLMSG_SPACE(4 + NLMSG_ALIGN(nlh->nlmsg_len)); | |
1392 | ||
1393 | skb = alloc_skb(size, GFP_KERNEL); | |
1394 | if (!skb) { | |
1395 | struct sock *sk; | |
1396 | ||
1397 | sk = netlink_lookup(in_skb->sk->sk_protocol, | |
1398 | NETLINK_CB(in_skb).pid); | |
1399 | if (sk) { | |
1400 | sk->sk_err = ENOBUFS; | |
1401 | sk->sk_error_report(sk); | |
1402 | sock_put(sk); | |
1403 | } | |
1404 | return; | |
1405 | } | |
1406 | ||
1407 | rep = __nlmsg_put(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, | |
1797754e | 1408 | NLMSG_ERROR, sizeof(struct nlmsgerr), 0); |
1da177e4 LT |
1409 | errmsg = NLMSG_DATA(rep); |
1410 | errmsg->error = err; | |
1411 | memcpy(&errmsg->msg, nlh, err ? nlh->nlmsg_len : sizeof(struct nlmsghdr)); | |
1412 | netlink_unicast(in_skb->sk, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); | |
1413 | } | |
1414 | ||
82ace47a TG |
1415 | static int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *, |
1416 | struct nlmsghdr *, int *)) | |
1417 | { | |
1418 | unsigned int total_len; | |
1419 | struct nlmsghdr *nlh; | |
1420 | int err; | |
1421 | ||
1422 | while (skb->len >= nlmsg_total_size(0)) { | |
1423 | nlh = (struct nlmsghdr *) skb->data; | |
1424 | ||
1425 | if (skb->len < nlh->nlmsg_len) | |
1426 | return 0; | |
1427 | ||
1428 | total_len = min(NLMSG_ALIGN(nlh->nlmsg_len), skb->len); | |
1429 | ||
1430 | if (cb(skb, nlh, &err) < 0) { | |
1431 | /* Not an error, but we have to interrupt processing | |
1432 | * here. Note: that in this case we do not pull | |
1433 | * message from skb, it will be processed later. | |
1434 | */ | |
1435 | if (err == 0) | |
1436 | return -1; | |
1437 | netlink_ack(skb, nlh, err); | |
1438 | } else if (nlh->nlmsg_flags & NLM_F_ACK) | |
1439 | netlink_ack(skb, nlh, 0); | |
1440 | ||
1441 | skb_pull(skb, total_len); | |
1442 | } | |
1443 | ||
1444 | return 0; | |
1445 | } | |
1446 | ||
1447 | /** | |
1448 | * nelink_run_queue - Process netlink receive queue. | |
1449 | * @sk: Netlink socket containing the queue | |
1450 | * @qlen: Place to store queue length upon entry | |
1451 | * @cb: Callback function invoked for each netlink message found | |
1452 | * | |
1453 | * Processes as much as there was in the queue upon entry and invokes | |
1454 | * a callback function for each netlink message found. The callback | |
1455 | * function may refuse a message by returning a negative error code | |
1456 | * but setting the error pointer to 0 in which case this function | |
1457 | * returns with a qlen != 0. | |
1458 | * | |
1459 | * qlen must be initialized to 0 before the initial entry, afterwards | |
1460 | * the function may be called repeatedly until qlen reaches 0. | |
1461 | */ | |
1462 | void netlink_run_queue(struct sock *sk, unsigned int *qlen, | |
1463 | int (*cb)(struct sk_buff *, struct nlmsghdr *, int *)) | |
1464 | { | |
1465 | struct sk_buff *skb; | |
1466 | ||
1467 | if (!*qlen || *qlen > skb_queue_len(&sk->sk_receive_queue)) | |
1468 | *qlen = skb_queue_len(&sk->sk_receive_queue); | |
1469 | ||
1470 | for (; *qlen; (*qlen)--) { | |
1471 | skb = skb_dequeue(&sk->sk_receive_queue); | |
1472 | if (netlink_rcv_skb(skb, cb)) { | |
1473 | if (skb->len) | |
1474 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1475 | else { | |
1476 | kfree_skb(skb); | |
1477 | (*qlen)--; | |
1478 | } | |
1479 | break; | |
1480 | } | |
1481 | ||
1482 | kfree_skb(skb); | |
1483 | } | |
1484 | } | |
1485 | ||
1486 | /** | |
1487 | * netlink_queue_skip - Skip netlink message while processing queue. | |
1488 | * @nlh: Netlink message to be skipped | |
1489 | * @skb: Socket buffer containing the netlink messages. | |
1490 | * | |
1491 | * Pulls the given netlink message off the socket buffer so the next | |
1492 | * call to netlink_queue_run() will not reconsider the message. | |
1493 | */ | |
1494 | void netlink_queue_skip(struct nlmsghdr *nlh, struct sk_buff *skb) | |
1495 | { | |
1496 | int msglen = NLMSG_ALIGN(nlh->nlmsg_len); | |
1497 | ||
1498 | if (msglen > skb->len) | |
1499 | msglen = skb->len; | |
1500 | ||
1501 | skb_pull(skb, msglen); | |
1502 | } | |
1da177e4 LT |
1503 | |
1504 | #ifdef CONFIG_PROC_FS | |
1505 | struct nl_seq_iter { | |
1506 | int link; | |
1507 | int hash_idx; | |
1508 | }; | |
1509 | ||
1510 | static struct sock *netlink_seq_socket_idx(struct seq_file *seq, loff_t pos) | |
1511 | { | |
1512 | struct nl_seq_iter *iter = seq->private; | |
1513 | int i, j; | |
1514 | struct sock *s; | |
1515 | struct hlist_node *node; | |
1516 | loff_t off = 0; | |
1517 | ||
1518 | for (i=0; i<MAX_LINKS; i++) { | |
1519 | struct nl_pid_hash *hash = &nl_table[i].hash; | |
1520 | ||
1521 | for (j = 0; j <= hash->mask; j++) { | |
1522 | sk_for_each(s, node, &hash->table[j]) { | |
1523 | if (off == pos) { | |
1524 | iter->link = i; | |
1525 | iter->hash_idx = j; | |
1526 | return s; | |
1527 | } | |
1528 | ++off; | |
1529 | } | |
1530 | } | |
1531 | } | |
1532 | return NULL; | |
1533 | } | |
1534 | ||
1535 | static void *netlink_seq_start(struct seq_file *seq, loff_t *pos) | |
1536 | { | |
1537 | read_lock(&nl_table_lock); | |
1538 | return *pos ? netlink_seq_socket_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
1539 | } | |
1540 | ||
1541 | static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1542 | { | |
1543 | struct sock *s; | |
1544 | struct nl_seq_iter *iter; | |
1545 | int i, j; | |
1546 | ||
1547 | ++*pos; | |
1548 | ||
1549 | if (v == SEQ_START_TOKEN) | |
1550 | return netlink_seq_socket_idx(seq, 0); | |
1551 | ||
1552 | s = sk_next(v); | |
1553 | if (s) | |
1554 | return s; | |
1555 | ||
1556 | iter = seq->private; | |
1557 | i = iter->link; | |
1558 | j = iter->hash_idx + 1; | |
1559 | ||
1560 | do { | |
1561 | struct nl_pid_hash *hash = &nl_table[i].hash; | |
1562 | ||
1563 | for (; j <= hash->mask; j++) { | |
1564 | s = sk_head(&hash->table[j]); | |
1565 | if (s) { | |
1566 | iter->link = i; | |
1567 | iter->hash_idx = j; | |
1568 | return s; | |
1569 | } | |
1570 | } | |
1571 | ||
1572 | j = 0; | |
1573 | } while (++i < MAX_LINKS); | |
1574 | ||
1575 | return NULL; | |
1576 | } | |
1577 | ||
1578 | static void netlink_seq_stop(struct seq_file *seq, void *v) | |
1579 | { | |
1580 | read_unlock(&nl_table_lock); | |
1581 | } | |
1582 | ||
1583 | ||
1584 | static int netlink_seq_show(struct seq_file *seq, void *v) | |
1585 | { | |
1586 | if (v == SEQ_START_TOKEN) | |
1587 | seq_puts(seq, | |
1588 | "sk Eth Pid Groups " | |
1589 | "Rmem Wmem Dump Locks\n"); | |
1590 | else { | |
1591 | struct sock *s = v; | |
1592 | struct netlink_sock *nlk = nlk_sk(s); | |
1593 | ||
1594 | seq_printf(seq, "%p %-3d %-6d %08x %-8d %-8d %p %d\n", | |
1595 | s, | |
1596 | s->sk_protocol, | |
1597 | nlk->pid, | |
513c2500 | 1598 | nlk->groups ? (u32)nlk->groups[0] : 0, |
1da177e4 LT |
1599 | atomic_read(&s->sk_rmem_alloc), |
1600 | atomic_read(&s->sk_wmem_alloc), | |
1601 | nlk->cb, | |
1602 | atomic_read(&s->sk_refcnt) | |
1603 | ); | |
1604 | ||
1605 | } | |
1606 | return 0; | |
1607 | } | |
1608 | ||
1609 | static struct seq_operations netlink_seq_ops = { | |
1610 | .start = netlink_seq_start, | |
1611 | .next = netlink_seq_next, | |
1612 | .stop = netlink_seq_stop, | |
1613 | .show = netlink_seq_show, | |
1614 | }; | |
1615 | ||
1616 | ||
1617 | static int netlink_seq_open(struct inode *inode, struct file *file) | |
1618 | { | |
1619 | struct seq_file *seq; | |
1620 | struct nl_seq_iter *iter; | |
1621 | int err; | |
1622 | ||
1623 | iter = kmalloc(sizeof(*iter), GFP_KERNEL); | |
1624 | if (!iter) | |
1625 | return -ENOMEM; | |
1626 | ||
1627 | err = seq_open(file, &netlink_seq_ops); | |
1628 | if (err) { | |
1629 | kfree(iter); | |
1630 | return err; | |
1631 | } | |
1632 | ||
1633 | memset(iter, 0, sizeof(*iter)); | |
1634 | seq = file->private_data; | |
1635 | seq->private = iter; | |
1636 | return 0; | |
1637 | } | |
1638 | ||
1639 | static struct file_operations netlink_seq_fops = { | |
1640 | .owner = THIS_MODULE, | |
1641 | .open = netlink_seq_open, | |
1642 | .read = seq_read, | |
1643 | .llseek = seq_lseek, | |
1644 | .release = seq_release_private, | |
1645 | }; | |
1646 | ||
1647 | #endif | |
1648 | ||
1649 | int netlink_register_notifier(struct notifier_block *nb) | |
1650 | { | |
1651 | return notifier_chain_register(&netlink_chain, nb); | |
1652 | } | |
1653 | ||
1654 | int netlink_unregister_notifier(struct notifier_block *nb) | |
1655 | { | |
1656 | return notifier_chain_unregister(&netlink_chain, nb); | |
1657 | } | |
1658 | ||
1659 | static struct proto_ops netlink_ops = { | |
1660 | .family = PF_NETLINK, | |
1661 | .owner = THIS_MODULE, | |
1662 | .release = netlink_release, | |
1663 | .bind = netlink_bind, | |
1664 | .connect = netlink_connect, | |
1665 | .socketpair = sock_no_socketpair, | |
1666 | .accept = sock_no_accept, | |
1667 | .getname = netlink_getname, | |
1668 | .poll = datagram_poll, | |
1669 | .ioctl = sock_no_ioctl, | |
1670 | .listen = sock_no_listen, | |
1671 | .shutdown = sock_no_shutdown, | |
9a4595bc PM |
1672 | .setsockopt = netlink_setsockopt, |
1673 | .getsockopt = netlink_getsockopt, | |
1da177e4 LT |
1674 | .sendmsg = netlink_sendmsg, |
1675 | .recvmsg = netlink_recvmsg, | |
1676 | .mmap = sock_no_mmap, | |
1677 | .sendpage = sock_no_sendpage, | |
1678 | }; | |
1679 | ||
1680 | static struct net_proto_family netlink_family_ops = { | |
1681 | .family = PF_NETLINK, | |
1682 | .create = netlink_create, | |
1683 | .owner = THIS_MODULE, /* for consistency 8) */ | |
1684 | }; | |
1685 | ||
1686 | extern void netlink_skb_parms_too_large(void); | |
1687 | ||
1688 | static int __init netlink_proto_init(void) | |
1689 | { | |
1690 | struct sk_buff *dummy_skb; | |
1691 | int i; | |
1692 | unsigned long max; | |
1693 | unsigned int order; | |
1694 | int err = proto_register(&netlink_proto, 0); | |
1695 | ||
1696 | if (err != 0) | |
1697 | goto out; | |
1698 | ||
1699 | if (sizeof(struct netlink_skb_parms) > sizeof(dummy_skb->cb)) | |
1700 | netlink_skb_parms_too_large(); | |
1701 | ||
1702 | nl_table = kmalloc(sizeof(*nl_table) * MAX_LINKS, GFP_KERNEL); | |
1703 | if (!nl_table) { | |
1704 | enomem: | |
1705 | printk(KERN_CRIT "netlink_init: Cannot allocate nl_table\n"); | |
1706 | return -ENOMEM; | |
1707 | } | |
1708 | ||
1709 | memset(nl_table, 0, sizeof(*nl_table) * MAX_LINKS); | |
1710 | ||
1711 | if (num_physpages >= (128 * 1024)) | |
1712 | max = num_physpages >> (21 - PAGE_SHIFT); | |
1713 | else | |
1714 | max = num_physpages >> (23 - PAGE_SHIFT); | |
1715 | ||
1716 | order = get_bitmask_order(max) - 1 + PAGE_SHIFT; | |
1717 | max = (1UL << order) / sizeof(struct hlist_head); | |
1718 | order = get_bitmask_order(max > UINT_MAX ? UINT_MAX : max) - 1; | |
1719 | ||
1720 | for (i = 0; i < MAX_LINKS; i++) { | |
1721 | struct nl_pid_hash *hash = &nl_table[i].hash; | |
1722 | ||
1723 | hash->table = nl_pid_hash_alloc(1 * sizeof(*hash->table)); | |
1724 | if (!hash->table) { | |
1725 | while (i-- > 0) | |
1726 | nl_pid_hash_free(nl_table[i].hash.table, | |
1727 | 1 * sizeof(*hash->table)); | |
1728 | kfree(nl_table); | |
1729 | goto enomem; | |
1730 | } | |
1731 | memset(hash->table, 0, 1 * sizeof(*hash->table)); | |
1732 | hash->max_shift = order; | |
1733 | hash->shift = 0; | |
1734 | hash->mask = 0; | |
1735 | hash->rehash_time = jiffies; | |
1736 | } | |
1737 | ||
1738 | sock_register(&netlink_family_ops); | |
1739 | #ifdef CONFIG_PROC_FS | |
1740 | proc_net_fops_create("netlink", 0, &netlink_seq_fops); | |
1741 | #endif | |
1742 | /* The netlink device handler may be needed early. */ | |
1743 | rtnetlink_init(); | |
1744 | out: | |
1745 | return err; | |
1746 | } | |
1747 | ||
1da177e4 | 1748 | core_initcall(netlink_proto_init); |
1da177e4 LT |
1749 | |
1750 | EXPORT_SYMBOL(netlink_ack); | |
82ace47a TG |
1751 | EXPORT_SYMBOL(netlink_run_queue); |
1752 | EXPORT_SYMBOL(netlink_queue_skip); | |
1da177e4 LT |
1753 | EXPORT_SYMBOL(netlink_broadcast); |
1754 | EXPORT_SYMBOL(netlink_dump_start); | |
1755 | EXPORT_SYMBOL(netlink_kernel_create); | |
1756 | EXPORT_SYMBOL(netlink_register_notifier); | |
1757 | EXPORT_SYMBOL(netlink_set_err); | |
1758 | EXPORT_SYMBOL(netlink_set_nonroot); | |
1759 | EXPORT_SYMBOL(netlink_unicast); | |
1760 | EXPORT_SYMBOL(netlink_unregister_notifier); | |
1761 |