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 | ||
4fc268d2 | 27 | #include <linux/capability.h> |
1da177e4 LT |
28 | #include <linux/kernel.h> |
29 | #include <linux/init.h> | |
1da177e4 LT |
30 | #include <linux/signal.h> |
31 | #include <linux/sched.h> | |
32 | #include <linux/errno.h> | |
33 | #include <linux/string.h> | |
34 | #include <linux/stat.h> | |
35 | #include <linux/socket.h> | |
36 | #include <linux/un.h> | |
37 | #include <linux/fcntl.h> | |
38 | #include <linux/termios.h> | |
39 | #include <linux/sockios.h> | |
40 | #include <linux/net.h> | |
41 | #include <linux/fs.h> | |
42 | #include <linux/slab.h> | |
43 | #include <asm/uaccess.h> | |
44 | #include <linux/skbuff.h> | |
45 | #include <linux/netdevice.h> | |
46 | #include <linux/rtnetlink.h> | |
47 | #include <linux/proc_fs.h> | |
48 | #include <linux/seq_file.h> | |
49 | #include <linux/smp_lock.h> | |
50 | #include <linux/notifier.h> | |
51 | #include <linux/security.h> | |
52 | #include <linux/jhash.h> | |
53 | #include <linux/jiffies.h> | |
54 | #include <linux/random.h> | |
55 | #include <linux/bitops.h> | |
56 | #include <linux/mm.h> | |
57 | #include <linux/types.h> | |
54e0f520 AM |
58 | #include <linux/audit.h> |
59 | ||
1da177e4 LT |
60 | #include <net/sock.h> |
61 | #include <net/scm.h> | |
82ace47a | 62 | #include <net/netlink.h> |
1da177e4 LT |
63 | |
64 | #define Nprintk(a...) | |
f7fa9b10 | 65 | #define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8) |
1da177e4 LT |
66 | |
67 | struct netlink_sock { | |
68 | /* struct sock has to be the first member of netlink_sock */ | |
69 | struct sock sk; | |
70 | u32 pid; | |
1da177e4 | 71 | u32 dst_pid; |
d629b836 | 72 | u32 dst_group; |
f7fa9b10 PM |
73 | u32 flags; |
74 | u32 subscriptions; | |
75 | u32 ngroups; | |
76 | unsigned long *groups; | |
1da177e4 LT |
77 | unsigned long state; |
78 | wait_queue_head_t wait; | |
79 | struct netlink_callback *cb; | |
80 | spinlock_t cb_lock; | |
81 | void (*data_ready)(struct sock *sk, int bytes); | |
77247bbb | 82 | struct module *module; |
1da177e4 LT |
83 | }; |
84 | ||
77247bbb | 85 | #define NETLINK_KERNEL_SOCKET 0x1 |
9a4595bc | 86 | #define NETLINK_RECV_PKTINFO 0x2 |
77247bbb | 87 | |
1da177e4 LT |
88 | static inline struct netlink_sock *nlk_sk(struct sock *sk) |
89 | { | |
90 | return (struct netlink_sock *)sk; | |
91 | } | |
92 | ||
93 | struct nl_pid_hash { | |
94 | struct hlist_head *table; | |
95 | unsigned long rehash_time; | |
96 | ||
97 | unsigned int mask; | |
98 | unsigned int shift; | |
99 | ||
100 | unsigned int entries; | |
101 | unsigned int max_shift; | |
102 | ||
103 | u32 rnd; | |
104 | }; | |
105 | ||
106 | struct netlink_table { | |
107 | struct nl_pid_hash hash; | |
108 | struct hlist_head mc_list; | |
4277a083 | 109 | unsigned long *listeners; |
1da177e4 | 110 | unsigned int nl_nonroot; |
f7fa9b10 | 111 | unsigned int groups; |
77247bbb | 112 | struct module *module; |
ab33a171 | 113 | int registered; |
1da177e4 LT |
114 | }; |
115 | ||
116 | static struct netlink_table *nl_table; | |
117 | ||
118 | static DECLARE_WAIT_QUEUE_HEAD(nl_table_wait); | |
119 | ||
120 | static int netlink_dump(struct sock *sk); | |
121 | static void netlink_destroy_callback(struct netlink_callback *cb); | |
122 | ||
123 | static DEFINE_RWLOCK(nl_table_lock); | |
124 | static atomic_t nl_table_users = ATOMIC_INIT(0); | |
125 | ||
e041c683 | 126 | static ATOMIC_NOTIFIER_HEAD(netlink_chain); |
1da177e4 | 127 | |
d629b836 PM |
128 | static u32 netlink_group_mask(u32 group) |
129 | { | |
130 | return group ? 1 << (group - 1) : 0; | |
131 | } | |
132 | ||
1da177e4 LT |
133 | static struct hlist_head *nl_pid_hashfn(struct nl_pid_hash *hash, u32 pid) |
134 | { | |
135 | return &hash->table[jhash_1word(pid, hash->rnd) & hash->mask]; | |
136 | } | |
137 | ||
138 | static void netlink_sock_destruct(struct sock *sk) | |
139 | { | |
140 | skb_queue_purge(&sk->sk_receive_queue); | |
141 | ||
142 | if (!sock_flag(sk, SOCK_DEAD)) { | |
143 | printk("Freeing alive netlink socket %p\n", sk); | |
144 | return; | |
145 | } | |
146 | BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); | |
147 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); | |
148 | BUG_TRAP(!nlk_sk(sk)->cb); | |
f7fa9b10 | 149 | BUG_TRAP(!nlk_sk(sk)->groups); |
1da177e4 LT |
150 | } |
151 | ||
152 | /* This lock without WQ_FLAG_EXCLUSIVE is good on UP and it is _very_ bad on SMP. | |
153 | * Look, when several writers sleep and reader wakes them up, all but one | |
154 | * immediately hit write lock and grab all the cpus. Exclusive sleep solves | |
155 | * this, _but_ remember, it adds useless work on UP machines. | |
156 | */ | |
157 | ||
158 | static void netlink_table_grab(void) | |
159 | { | |
160 | write_lock_bh(&nl_table_lock); | |
161 | ||
162 | if (atomic_read(&nl_table_users)) { | |
163 | DECLARE_WAITQUEUE(wait, current); | |
164 | ||
165 | add_wait_queue_exclusive(&nl_table_wait, &wait); | |
166 | for(;;) { | |
167 | set_current_state(TASK_UNINTERRUPTIBLE); | |
168 | if (atomic_read(&nl_table_users) == 0) | |
169 | break; | |
170 | write_unlock_bh(&nl_table_lock); | |
171 | schedule(); | |
172 | write_lock_bh(&nl_table_lock); | |
173 | } | |
174 | ||
175 | __set_current_state(TASK_RUNNING); | |
176 | remove_wait_queue(&nl_table_wait, &wait); | |
177 | } | |
178 | } | |
179 | ||
180 | static __inline__ void netlink_table_ungrab(void) | |
181 | { | |
182 | write_unlock_bh(&nl_table_lock); | |
183 | wake_up(&nl_table_wait); | |
184 | } | |
185 | ||
186 | static __inline__ void | |
187 | netlink_lock_table(void) | |
188 | { | |
189 | /* read_lock() synchronizes us to netlink_table_grab */ | |
190 | ||
191 | read_lock(&nl_table_lock); | |
192 | atomic_inc(&nl_table_users); | |
193 | read_unlock(&nl_table_lock); | |
194 | } | |
195 | ||
196 | static __inline__ void | |
197 | netlink_unlock_table(void) | |
198 | { | |
199 | if (atomic_dec_and_test(&nl_table_users)) | |
200 | wake_up(&nl_table_wait); | |
201 | } | |
202 | ||
203 | static __inline__ struct sock *netlink_lookup(int protocol, u32 pid) | |
204 | { | |
205 | struct nl_pid_hash *hash = &nl_table[protocol].hash; | |
206 | struct hlist_head *head; | |
207 | struct sock *sk; | |
208 | struct hlist_node *node; | |
209 | ||
210 | read_lock(&nl_table_lock); | |
211 | head = nl_pid_hashfn(hash, pid); | |
212 | sk_for_each(sk, node, head) { | |
213 | if (nlk_sk(sk)->pid == pid) { | |
214 | sock_hold(sk); | |
215 | goto found; | |
216 | } | |
217 | } | |
218 | sk = NULL; | |
219 | found: | |
220 | read_unlock(&nl_table_lock); | |
221 | return sk; | |
222 | } | |
223 | ||
224 | static inline struct hlist_head *nl_pid_hash_alloc(size_t size) | |
225 | { | |
226 | if (size <= PAGE_SIZE) | |
227 | return kmalloc(size, GFP_ATOMIC); | |
228 | else | |
229 | return (struct hlist_head *) | |
230 | __get_free_pages(GFP_ATOMIC, get_order(size)); | |
231 | } | |
232 | ||
233 | static inline void nl_pid_hash_free(struct hlist_head *table, size_t size) | |
234 | { | |
235 | if (size <= PAGE_SIZE) | |
236 | kfree(table); | |
237 | else | |
238 | free_pages((unsigned long)table, get_order(size)); | |
239 | } | |
240 | ||
241 | static int nl_pid_hash_rehash(struct nl_pid_hash *hash, int grow) | |
242 | { | |
243 | unsigned int omask, mask, shift; | |
244 | size_t osize, size; | |
245 | struct hlist_head *otable, *table; | |
246 | int i; | |
247 | ||
248 | omask = mask = hash->mask; | |
249 | osize = size = (mask + 1) * sizeof(*table); | |
250 | shift = hash->shift; | |
251 | ||
252 | if (grow) { | |
253 | if (++shift > hash->max_shift) | |
254 | return 0; | |
255 | mask = mask * 2 + 1; | |
256 | size *= 2; | |
257 | } | |
258 | ||
259 | table = nl_pid_hash_alloc(size); | |
260 | if (!table) | |
261 | return 0; | |
262 | ||
263 | memset(table, 0, size); | |
264 | otable = hash->table; | |
265 | hash->table = table; | |
266 | hash->mask = mask; | |
267 | hash->shift = shift; | |
268 | get_random_bytes(&hash->rnd, sizeof(hash->rnd)); | |
269 | ||
270 | for (i = 0; i <= omask; i++) { | |
271 | struct sock *sk; | |
272 | struct hlist_node *node, *tmp; | |
273 | ||
274 | sk_for_each_safe(sk, node, tmp, &otable[i]) | |
275 | __sk_add_node(sk, nl_pid_hashfn(hash, nlk_sk(sk)->pid)); | |
276 | } | |
277 | ||
278 | nl_pid_hash_free(otable, osize); | |
279 | hash->rehash_time = jiffies + 10 * 60 * HZ; | |
280 | return 1; | |
281 | } | |
282 | ||
283 | static inline int nl_pid_hash_dilute(struct nl_pid_hash *hash, int len) | |
284 | { | |
285 | int avg = hash->entries >> hash->shift; | |
286 | ||
287 | if (unlikely(avg > 1) && nl_pid_hash_rehash(hash, 1)) | |
288 | return 1; | |
289 | ||
290 | if (unlikely(len > avg) && time_after(jiffies, hash->rehash_time)) { | |
291 | nl_pid_hash_rehash(hash, 0); | |
292 | return 1; | |
293 | } | |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
90ddc4f0 | 298 | static const struct proto_ops netlink_ops; |
1da177e4 | 299 | |
4277a083 PM |
300 | static void |
301 | netlink_update_listeners(struct sock *sk) | |
302 | { | |
303 | struct netlink_table *tbl = &nl_table[sk->sk_protocol]; | |
304 | struct hlist_node *node; | |
305 | unsigned long mask; | |
306 | unsigned int i; | |
307 | ||
308 | for (i = 0; i < NLGRPSZ(tbl->groups)/sizeof(unsigned long); i++) { | |
309 | mask = 0; | |
310 | sk_for_each_bound(sk, node, &tbl->mc_list) | |
311 | mask |= nlk_sk(sk)->groups[i]; | |
312 | tbl->listeners[i] = mask; | |
313 | } | |
314 | /* this function is only called with the netlink table "grabbed", which | |
315 | * makes sure updates are visible before bind or setsockopt return. */ | |
316 | } | |
317 | ||
1da177e4 LT |
318 | static int netlink_insert(struct sock *sk, u32 pid) |
319 | { | |
320 | struct nl_pid_hash *hash = &nl_table[sk->sk_protocol].hash; | |
321 | struct hlist_head *head; | |
322 | int err = -EADDRINUSE; | |
323 | struct sock *osk; | |
324 | struct hlist_node *node; | |
325 | int len; | |
326 | ||
327 | netlink_table_grab(); | |
328 | head = nl_pid_hashfn(hash, pid); | |
329 | len = 0; | |
330 | sk_for_each(osk, node, head) { | |
331 | if (nlk_sk(osk)->pid == pid) | |
332 | break; | |
333 | len++; | |
334 | } | |
335 | if (node) | |
336 | goto err; | |
337 | ||
338 | err = -EBUSY; | |
339 | if (nlk_sk(sk)->pid) | |
340 | goto err; | |
341 | ||
342 | err = -ENOMEM; | |
343 | if (BITS_PER_LONG > 32 && unlikely(hash->entries >= UINT_MAX)) | |
344 | goto err; | |
345 | ||
346 | if (len && nl_pid_hash_dilute(hash, len)) | |
347 | head = nl_pid_hashfn(hash, pid); | |
348 | hash->entries++; | |
349 | nlk_sk(sk)->pid = pid; | |
350 | sk_add_node(sk, head); | |
351 | err = 0; | |
352 | ||
353 | err: | |
354 | netlink_table_ungrab(); | |
355 | return err; | |
356 | } | |
357 | ||
358 | static void netlink_remove(struct sock *sk) | |
359 | { | |
360 | netlink_table_grab(); | |
d470e3b4 DM |
361 | if (sk_del_node_init(sk)) |
362 | nl_table[sk->sk_protocol].hash.entries--; | |
f7fa9b10 | 363 | if (nlk_sk(sk)->subscriptions) |
1da177e4 LT |
364 | __sk_del_bind_node(sk); |
365 | netlink_table_ungrab(); | |
366 | } | |
367 | ||
368 | static struct proto netlink_proto = { | |
369 | .name = "NETLINK", | |
370 | .owner = THIS_MODULE, | |
371 | .obj_size = sizeof(struct netlink_sock), | |
372 | }; | |
373 | ||
ab33a171 | 374 | static int __netlink_create(struct socket *sock, int protocol) |
1da177e4 LT |
375 | { |
376 | struct sock *sk; | |
377 | struct netlink_sock *nlk; | |
ab33a171 PM |
378 | |
379 | sock->ops = &netlink_ops; | |
380 | ||
381 | sk = sk_alloc(PF_NETLINK, GFP_KERNEL, &netlink_proto, 1); | |
382 | if (!sk) | |
383 | return -ENOMEM; | |
384 | ||
385 | sock_init_data(sock, sk); | |
386 | ||
387 | nlk = nlk_sk(sk); | |
388 | spin_lock_init(&nlk->cb_lock); | |
389 | init_waitqueue_head(&nlk->wait); | |
390 | ||
391 | sk->sk_destruct = netlink_sock_destruct; | |
392 | sk->sk_protocol = protocol; | |
393 | return 0; | |
394 | } | |
395 | ||
396 | static int netlink_create(struct socket *sock, int protocol) | |
397 | { | |
398 | struct module *module = NULL; | |
f7fa9b10 PM |
399 | struct netlink_sock *nlk; |
400 | unsigned int groups; | |
ab33a171 | 401 | int err = 0; |
1da177e4 LT |
402 | |
403 | sock->state = SS_UNCONNECTED; | |
404 | ||
405 | if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) | |
406 | return -ESOCKTNOSUPPORT; | |
407 | ||
408 | if (protocol<0 || protocol >= MAX_LINKS) | |
409 | return -EPROTONOSUPPORT; | |
410 | ||
77247bbb | 411 | netlink_lock_table(); |
4fdb3bb7 | 412 | #ifdef CONFIG_KMOD |
ab33a171 | 413 | if (!nl_table[protocol].registered) { |
77247bbb | 414 | netlink_unlock_table(); |
4fdb3bb7 | 415 | request_module("net-pf-%d-proto-%d", PF_NETLINK, protocol); |
77247bbb | 416 | netlink_lock_table(); |
4fdb3bb7 | 417 | } |
ab33a171 PM |
418 | #endif |
419 | if (nl_table[protocol].registered && | |
420 | try_module_get(nl_table[protocol].module)) | |
421 | module = nl_table[protocol].module; | |
f7fa9b10 | 422 | groups = nl_table[protocol].groups; |
77247bbb | 423 | netlink_unlock_table(); |
4fdb3bb7 | 424 | |
14591de1 | 425 | if ((err = __netlink_create(sock, protocol)) < 0) |
f7fa9b10 PM |
426 | goto out_module; |
427 | ||
428 | nlk = nlk_sk(sock->sk); | |
f7fa9b10 | 429 | nlk->module = module; |
ab33a171 PM |
430 | out: |
431 | return err; | |
1da177e4 | 432 | |
ab33a171 PM |
433 | out_module: |
434 | module_put(module); | |
435 | goto out; | |
1da177e4 LT |
436 | } |
437 | ||
438 | static int netlink_release(struct socket *sock) | |
439 | { | |
440 | struct sock *sk = sock->sk; | |
441 | struct netlink_sock *nlk; | |
442 | ||
443 | if (!sk) | |
444 | return 0; | |
445 | ||
446 | netlink_remove(sk); | |
447 | nlk = nlk_sk(sk); | |
448 | ||
449 | spin_lock(&nlk->cb_lock); | |
450 | if (nlk->cb) { | |
a8f74b22 TG |
451 | if (nlk->cb->done) |
452 | nlk->cb->done(nlk->cb); | |
1da177e4 LT |
453 | netlink_destroy_callback(nlk->cb); |
454 | nlk->cb = NULL; | |
1da177e4 LT |
455 | } |
456 | spin_unlock(&nlk->cb_lock); | |
457 | ||
458 | /* OK. Socket is unlinked, and, therefore, | |
459 | no new packets will arrive */ | |
460 | ||
461 | sock_orphan(sk); | |
462 | sock->sk = NULL; | |
463 | wake_up_interruptible_all(&nlk->wait); | |
464 | ||
465 | skb_queue_purge(&sk->sk_write_queue); | |
466 | ||
f7fa9b10 | 467 | if (nlk->pid && !nlk->subscriptions) { |
1da177e4 LT |
468 | struct netlink_notify n = { |
469 | .protocol = sk->sk_protocol, | |
470 | .pid = nlk->pid, | |
471 | }; | |
e041c683 AS |
472 | atomic_notifier_call_chain(&netlink_chain, |
473 | NETLINK_URELEASE, &n); | |
1da177e4 | 474 | } |
4fdb3bb7 | 475 | |
77247bbb PM |
476 | if (nlk->module) |
477 | module_put(nlk->module); | |
4fdb3bb7 | 478 | |
4277a083 | 479 | netlink_table_grab(); |
77247bbb | 480 | if (nlk->flags & NETLINK_KERNEL_SOCKET) { |
4277a083 | 481 | kfree(nl_table[sk->sk_protocol].listeners); |
77247bbb | 482 | nl_table[sk->sk_protocol].module = NULL; |
ab33a171 | 483 | nl_table[sk->sk_protocol].registered = 0; |
4277a083 PM |
484 | } else if (nlk->subscriptions) |
485 | netlink_update_listeners(sk); | |
486 | netlink_table_ungrab(); | |
77247bbb | 487 | |
f7fa9b10 PM |
488 | kfree(nlk->groups); |
489 | nlk->groups = NULL; | |
490 | ||
1da177e4 LT |
491 | sock_put(sk); |
492 | return 0; | |
493 | } | |
494 | ||
495 | static int netlink_autobind(struct socket *sock) | |
496 | { | |
497 | struct sock *sk = sock->sk; | |
498 | struct nl_pid_hash *hash = &nl_table[sk->sk_protocol].hash; | |
499 | struct hlist_head *head; | |
500 | struct sock *osk; | |
501 | struct hlist_node *node; | |
c27bd492 | 502 | s32 pid = current->tgid; |
1da177e4 LT |
503 | int err; |
504 | static s32 rover = -4097; | |
505 | ||
506 | retry: | |
507 | cond_resched(); | |
508 | netlink_table_grab(); | |
509 | head = nl_pid_hashfn(hash, pid); | |
510 | sk_for_each(osk, node, head) { | |
511 | if (nlk_sk(osk)->pid == pid) { | |
512 | /* Bind collision, search negative pid values. */ | |
513 | pid = rover--; | |
514 | if (rover > -4097) | |
515 | rover = -4097; | |
516 | netlink_table_ungrab(); | |
517 | goto retry; | |
518 | } | |
519 | } | |
520 | netlink_table_ungrab(); | |
521 | ||
522 | err = netlink_insert(sk, pid); | |
523 | if (err == -EADDRINUSE) | |
524 | goto retry; | |
d470e3b4 DM |
525 | |
526 | /* If 2 threads race to autobind, that is fine. */ | |
527 | if (err == -EBUSY) | |
528 | err = 0; | |
529 | ||
530 | return err; | |
1da177e4 LT |
531 | } |
532 | ||
533 | static inline int netlink_capable(struct socket *sock, unsigned int flag) | |
534 | { | |
535 | return (nl_table[sock->sk->sk_protocol].nl_nonroot & flag) || | |
536 | capable(CAP_NET_ADMIN); | |
537 | } | |
538 | ||
f7fa9b10 PM |
539 | static void |
540 | netlink_update_subscriptions(struct sock *sk, unsigned int subscriptions) | |
541 | { | |
542 | struct netlink_sock *nlk = nlk_sk(sk); | |
543 | ||
544 | if (nlk->subscriptions && !subscriptions) | |
545 | __sk_del_bind_node(sk); | |
546 | else if (!nlk->subscriptions && subscriptions) | |
547 | sk_add_bind_node(sk, &nl_table[sk->sk_protocol].mc_list); | |
548 | nlk->subscriptions = subscriptions; | |
549 | } | |
550 | ||
513c2500 PM |
551 | static int netlink_alloc_groups(struct sock *sk) |
552 | { | |
553 | struct netlink_sock *nlk = nlk_sk(sk); | |
554 | unsigned int groups; | |
555 | int err = 0; | |
556 | ||
557 | netlink_lock_table(); | |
558 | groups = nl_table[sk->sk_protocol].groups; | |
559 | if (!nl_table[sk->sk_protocol].registered) | |
560 | err = -ENOENT; | |
561 | netlink_unlock_table(); | |
562 | ||
563 | if (err) | |
564 | return err; | |
565 | ||
566 | nlk->groups = kmalloc(NLGRPSZ(groups), GFP_KERNEL); | |
567 | if (nlk->groups == NULL) | |
568 | return -ENOMEM; | |
569 | memset(nlk->groups, 0, NLGRPSZ(groups)); | |
570 | nlk->ngroups = groups; | |
571 | return 0; | |
572 | } | |
573 | ||
1da177e4 LT |
574 | static int netlink_bind(struct socket *sock, struct sockaddr *addr, int addr_len) |
575 | { | |
576 | struct sock *sk = sock->sk; | |
577 | struct netlink_sock *nlk = nlk_sk(sk); | |
578 | struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr; | |
579 | int err; | |
580 | ||
581 | if (nladdr->nl_family != AF_NETLINK) | |
582 | return -EINVAL; | |
583 | ||
584 | /* Only superuser is allowed to listen multicasts */ | |
513c2500 PM |
585 | if (nladdr->nl_groups) { |
586 | if (!netlink_capable(sock, NL_NONROOT_RECV)) | |
587 | return -EPERM; | |
588 | if (nlk->groups == NULL) { | |
589 | err = netlink_alloc_groups(sk); | |
590 | if (err) | |
591 | return err; | |
592 | } | |
593 | } | |
1da177e4 LT |
594 | |
595 | if (nlk->pid) { | |
596 | if (nladdr->nl_pid != nlk->pid) | |
597 | return -EINVAL; | |
598 | } else { | |
599 | err = nladdr->nl_pid ? | |
600 | netlink_insert(sk, nladdr->nl_pid) : | |
601 | netlink_autobind(sock); | |
602 | if (err) | |
603 | return err; | |
604 | } | |
605 | ||
513c2500 | 606 | if (!nladdr->nl_groups && (nlk->groups == NULL || !(u32)nlk->groups[0])) |
1da177e4 LT |
607 | return 0; |
608 | ||
609 | netlink_table_grab(); | |
f7fa9b10 PM |
610 | netlink_update_subscriptions(sk, nlk->subscriptions + |
611 | hweight32(nladdr->nl_groups) - | |
612 | hweight32(nlk->groups[0])); | |
613 | nlk->groups[0] = (nlk->groups[0] & ~0xffffffffUL) | nladdr->nl_groups; | |
4277a083 | 614 | netlink_update_listeners(sk); |
1da177e4 LT |
615 | netlink_table_ungrab(); |
616 | ||
617 | return 0; | |
618 | } | |
619 | ||
620 | static int netlink_connect(struct socket *sock, struct sockaddr *addr, | |
621 | int alen, int flags) | |
622 | { | |
623 | int err = 0; | |
624 | struct sock *sk = sock->sk; | |
625 | struct netlink_sock *nlk = nlk_sk(sk); | |
626 | struct sockaddr_nl *nladdr=(struct sockaddr_nl*)addr; | |
627 | ||
628 | if (addr->sa_family == AF_UNSPEC) { | |
629 | sk->sk_state = NETLINK_UNCONNECTED; | |
630 | nlk->dst_pid = 0; | |
d629b836 | 631 | nlk->dst_group = 0; |
1da177e4 LT |
632 | return 0; |
633 | } | |
634 | if (addr->sa_family != AF_NETLINK) | |
635 | return -EINVAL; | |
636 | ||
637 | /* Only superuser is allowed to send multicasts */ | |
638 | if (nladdr->nl_groups && !netlink_capable(sock, NL_NONROOT_SEND)) | |
639 | return -EPERM; | |
640 | ||
641 | if (!nlk->pid) | |
642 | err = netlink_autobind(sock); | |
643 | ||
644 | if (err == 0) { | |
645 | sk->sk_state = NETLINK_CONNECTED; | |
646 | nlk->dst_pid = nladdr->nl_pid; | |
d629b836 | 647 | nlk->dst_group = ffs(nladdr->nl_groups); |
1da177e4 LT |
648 | } |
649 | ||
650 | return err; | |
651 | } | |
652 | ||
653 | static int netlink_getname(struct socket *sock, struct sockaddr *addr, int *addr_len, int peer) | |
654 | { | |
655 | struct sock *sk = sock->sk; | |
656 | struct netlink_sock *nlk = nlk_sk(sk); | |
657 | struct sockaddr_nl *nladdr=(struct sockaddr_nl *)addr; | |
658 | ||
659 | nladdr->nl_family = AF_NETLINK; | |
660 | nladdr->nl_pad = 0; | |
661 | *addr_len = sizeof(*nladdr); | |
662 | ||
663 | if (peer) { | |
664 | nladdr->nl_pid = nlk->dst_pid; | |
d629b836 | 665 | nladdr->nl_groups = netlink_group_mask(nlk->dst_group); |
1da177e4 LT |
666 | } else { |
667 | nladdr->nl_pid = nlk->pid; | |
513c2500 | 668 | nladdr->nl_groups = nlk->groups ? nlk->groups[0] : 0; |
1da177e4 LT |
669 | } |
670 | return 0; | |
671 | } | |
672 | ||
673 | static void netlink_overrun(struct sock *sk) | |
674 | { | |
675 | if (!test_and_set_bit(0, &nlk_sk(sk)->state)) { | |
676 | sk->sk_err = ENOBUFS; | |
677 | sk->sk_error_report(sk); | |
678 | } | |
679 | } | |
680 | ||
681 | static struct sock *netlink_getsockbypid(struct sock *ssk, u32 pid) | |
682 | { | |
683 | int protocol = ssk->sk_protocol; | |
684 | struct sock *sock; | |
685 | struct netlink_sock *nlk; | |
686 | ||
687 | sock = netlink_lookup(protocol, pid); | |
688 | if (!sock) | |
689 | return ERR_PTR(-ECONNREFUSED); | |
690 | ||
691 | /* Don't bother queuing skb if kernel socket has no input function */ | |
692 | nlk = nlk_sk(sock); | |
693 | if ((nlk->pid == 0 && !nlk->data_ready) || | |
694 | (sock->sk_state == NETLINK_CONNECTED && | |
695 | nlk->dst_pid != nlk_sk(ssk)->pid)) { | |
696 | sock_put(sock); | |
697 | return ERR_PTR(-ECONNREFUSED); | |
698 | } | |
699 | return sock; | |
700 | } | |
701 | ||
702 | struct sock *netlink_getsockbyfilp(struct file *filp) | |
703 | { | |
704 | struct inode *inode = filp->f_dentry->d_inode; | |
705 | struct sock *sock; | |
706 | ||
707 | if (!S_ISSOCK(inode->i_mode)) | |
708 | return ERR_PTR(-ENOTSOCK); | |
709 | ||
710 | sock = SOCKET_I(inode)->sk; | |
711 | if (sock->sk_family != AF_NETLINK) | |
712 | return ERR_PTR(-EINVAL); | |
713 | ||
714 | sock_hold(sock); | |
715 | return sock; | |
716 | } | |
717 | ||
718 | /* | |
719 | * Attach a skb to a netlink socket. | |
720 | * The caller must hold a reference to the destination socket. On error, the | |
721 | * reference is dropped. The skb is not send to the destination, just all | |
722 | * all error checks are performed and memory in the queue is reserved. | |
723 | * Return values: | |
724 | * < 0: error. skb freed, reference to sock dropped. | |
725 | * 0: continue | |
726 | * 1: repeat lookup - reference dropped while waiting for socket memory. | |
727 | */ | |
a70ea994 AK |
728 | int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, |
729 | long timeo, struct sock *ssk) | |
1da177e4 LT |
730 | { |
731 | struct netlink_sock *nlk; | |
732 | ||
733 | nlk = nlk_sk(sk); | |
734 | ||
735 | if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf || | |
736 | test_bit(0, &nlk->state)) { | |
737 | DECLARE_WAITQUEUE(wait, current); | |
738 | if (!timeo) { | |
a70ea994 | 739 | if (!ssk || nlk_sk(ssk)->pid == 0) |
1da177e4 LT |
740 | netlink_overrun(sk); |
741 | sock_put(sk); | |
742 | kfree_skb(skb); | |
743 | return -EAGAIN; | |
744 | } | |
745 | ||
746 | __set_current_state(TASK_INTERRUPTIBLE); | |
747 | add_wait_queue(&nlk->wait, &wait); | |
748 | ||
749 | if ((atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf || | |
750 | test_bit(0, &nlk->state)) && | |
751 | !sock_flag(sk, SOCK_DEAD)) | |
752 | timeo = schedule_timeout(timeo); | |
753 | ||
754 | __set_current_state(TASK_RUNNING); | |
755 | remove_wait_queue(&nlk->wait, &wait); | |
756 | sock_put(sk); | |
757 | ||
758 | if (signal_pending(current)) { | |
759 | kfree_skb(skb); | |
760 | return sock_intr_errno(timeo); | |
761 | } | |
762 | return 1; | |
763 | } | |
764 | skb_set_owner_r(skb, sk); | |
765 | return 0; | |
766 | } | |
767 | ||
768 | int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol) | |
769 | { | |
1da177e4 LT |
770 | int len = skb->len; |
771 | ||
1da177e4 LT |
772 | skb_queue_tail(&sk->sk_receive_queue, skb); |
773 | sk->sk_data_ready(sk, len); | |
774 | sock_put(sk); | |
775 | return len; | |
776 | } | |
777 | ||
778 | void netlink_detachskb(struct sock *sk, struct sk_buff *skb) | |
779 | { | |
780 | kfree_skb(skb); | |
781 | sock_put(sk); | |
782 | } | |
783 | ||
37da647d | 784 | static inline struct sk_buff *netlink_trim(struct sk_buff *skb, |
dd0fc66f | 785 | gfp_t allocation) |
1da177e4 LT |
786 | { |
787 | int delta; | |
788 | ||
789 | skb_orphan(skb); | |
790 | ||
791 | delta = skb->end - skb->tail; | |
792 | if (delta * 2 < skb->truesize) | |
793 | return skb; | |
794 | ||
795 | if (skb_shared(skb)) { | |
796 | struct sk_buff *nskb = skb_clone(skb, allocation); | |
797 | if (!nskb) | |
798 | return skb; | |
799 | kfree_skb(skb); | |
800 | skb = nskb; | |
801 | } | |
802 | ||
803 | if (!pskb_expand_head(skb, 0, -delta, allocation)) | |
804 | skb->truesize -= delta; | |
805 | ||
806 | return skb; | |
807 | } | |
808 | ||
809 | int netlink_unicast(struct sock *ssk, struct sk_buff *skb, u32 pid, int nonblock) | |
810 | { | |
811 | struct sock *sk; | |
812 | int err; | |
813 | long timeo; | |
814 | ||
815 | skb = netlink_trim(skb, gfp_any()); | |
816 | ||
817 | timeo = sock_sndtimeo(ssk, nonblock); | |
818 | retry: | |
819 | sk = netlink_getsockbypid(ssk, pid); | |
820 | if (IS_ERR(sk)) { | |
821 | kfree_skb(skb); | |
822 | return PTR_ERR(sk); | |
823 | } | |
a70ea994 | 824 | err = netlink_attachskb(sk, skb, nonblock, timeo, ssk); |
1da177e4 LT |
825 | if (err == 1) |
826 | goto retry; | |
827 | if (err) | |
828 | return err; | |
829 | ||
830 | return netlink_sendskb(sk, skb, ssk->sk_protocol); | |
831 | } | |
832 | ||
4277a083 PM |
833 | int netlink_has_listeners(struct sock *sk, unsigned int group) |
834 | { | |
835 | int res = 0; | |
836 | ||
837 | BUG_ON(!(nlk_sk(sk)->flags & NETLINK_KERNEL_SOCKET)); | |
838 | if (group - 1 < nl_table[sk->sk_protocol].groups) | |
839 | res = test_bit(group - 1, nl_table[sk->sk_protocol].listeners); | |
840 | return res; | |
841 | } | |
842 | EXPORT_SYMBOL_GPL(netlink_has_listeners); | |
843 | ||
1da177e4 LT |
844 | static __inline__ int netlink_broadcast_deliver(struct sock *sk, struct sk_buff *skb) |
845 | { | |
846 | struct netlink_sock *nlk = nlk_sk(sk); | |
847 | ||
848 | if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf && | |
849 | !test_bit(0, &nlk->state)) { | |
850 | skb_set_owner_r(skb, sk); | |
851 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
852 | sk->sk_data_ready(sk, skb->len); | |
853 | return atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf; | |
854 | } | |
855 | return -1; | |
856 | } | |
857 | ||
858 | struct netlink_broadcast_data { | |
859 | struct sock *exclude_sk; | |
860 | u32 pid; | |
861 | u32 group; | |
862 | int failure; | |
863 | int congested; | |
864 | int delivered; | |
7d877f3b | 865 | gfp_t allocation; |
1da177e4 LT |
866 | struct sk_buff *skb, *skb2; |
867 | }; | |
868 | ||
869 | static inline int do_one_broadcast(struct sock *sk, | |
870 | struct netlink_broadcast_data *p) | |
871 | { | |
872 | struct netlink_sock *nlk = nlk_sk(sk); | |
873 | int val; | |
874 | ||
875 | if (p->exclude_sk == sk) | |
876 | goto out; | |
877 | ||
f7fa9b10 PM |
878 | if (nlk->pid == p->pid || p->group - 1 >= nlk->ngroups || |
879 | !test_bit(p->group - 1, nlk->groups)) | |
1da177e4 LT |
880 | goto out; |
881 | ||
882 | if (p->failure) { | |
883 | netlink_overrun(sk); | |
884 | goto out; | |
885 | } | |
886 | ||
887 | sock_hold(sk); | |
888 | if (p->skb2 == NULL) { | |
68acc024 | 889 | if (skb_shared(p->skb)) { |
1da177e4 LT |
890 | p->skb2 = skb_clone(p->skb, p->allocation); |
891 | } else { | |
68acc024 TC |
892 | p->skb2 = skb_get(p->skb); |
893 | /* | |
894 | * skb ownership may have been set when | |
895 | * delivered to a previous socket. | |
896 | */ | |
897 | skb_orphan(p->skb2); | |
1da177e4 LT |
898 | } |
899 | } | |
900 | if (p->skb2 == NULL) { | |
901 | netlink_overrun(sk); | |
902 | /* Clone failed. Notify ALL listeners. */ | |
903 | p->failure = 1; | |
904 | } else if ((val = netlink_broadcast_deliver(sk, p->skb2)) < 0) { | |
905 | netlink_overrun(sk); | |
906 | } else { | |
907 | p->congested |= val; | |
908 | p->delivered = 1; | |
909 | p->skb2 = NULL; | |
910 | } | |
911 | sock_put(sk); | |
912 | ||
913 | out: | |
914 | return 0; | |
915 | } | |
916 | ||
917 | int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, u32 pid, | |
dd0fc66f | 918 | u32 group, gfp_t allocation) |
1da177e4 LT |
919 | { |
920 | struct netlink_broadcast_data info; | |
921 | struct hlist_node *node; | |
922 | struct sock *sk; | |
923 | ||
924 | skb = netlink_trim(skb, allocation); | |
925 | ||
926 | info.exclude_sk = ssk; | |
927 | info.pid = pid; | |
928 | info.group = group; | |
929 | info.failure = 0; | |
930 | info.congested = 0; | |
931 | info.delivered = 0; | |
932 | info.allocation = allocation; | |
933 | info.skb = skb; | |
934 | info.skb2 = NULL; | |
935 | ||
936 | /* While we sleep in clone, do not allow to change socket list */ | |
937 | ||
938 | netlink_lock_table(); | |
939 | ||
940 | sk_for_each_bound(sk, node, &nl_table[ssk->sk_protocol].mc_list) | |
941 | do_one_broadcast(sk, &info); | |
942 | ||
aa1c6a6f TC |
943 | kfree_skb(skb); |
944 | ||
1da177e4 LT |
945 | netlink_unlock_table(); |
946 | ||
947 | if (info.skb2) | |
948 | kfree_skb(info.skb2); | |
1da177e4 LT |
949 | |
950 | if (info.delivered) { | |
951 | if (info.congested && (allocation & __GFP_WAIT)) | |
952 | yield(); | |
953 | return 0; | |
954 | } | |
955 | if (info.failure) | |
956 | return -ENOBUFS; | |
957 | return -ESRCH; | |
958 | } | |
959 | ||
960 | struct netlink_set_err_data { | |
961 | struct sock *exclude_sk; | |
962 | u32 pid; | |
963 | u32 group; | |
964 | int code; | |
965 | }; | |
966 | ||
967 | static inline int do_one_set_err(struct sock *sk, | |
968 | struct netlink_set_err_data *p) | |
969 | { | |
970 | struct netlink_sock *nlk = nlk_sk(sk); | |
971 | ||
972 | if (sk == p->exclude_sk) | |
973 | goto out; | |
974 | ||
f7fa9b10 PM |
975 | if (nlk->pid == p->pid || p->group - 1 >= nlk->ngroups || |
976 | !test_bit(p->group - 1, nlk->groups)) | |
1da177e4 LT |
977 | goto out; |
978 | ||
979 | sk->sk_err = p->code; | |
980 | sk->sk_error_report(sk); | |
981 | out: | |
982 | return 0; | |
983 | } | |
984 | ||
985 | void netlink_set_err(struct sock *ssk, u32 pid, u32 group, int code) | |
986 | { | |
987 | struct netlink_set_err_data info; | |
988 | struct hlist_node *node; | |
989 | struct sock *sk; | |
990 | ||
991 | info.exclude_sk = ssk; | |
992 | info.pid = pid; | |
993 | info.group = group; | |
994 | info.code = code; | |
995 | ||
996 | read_lock(&nl_table_lock); | |
997 | ||
998 | sk_for_each_bound(sk, node, &nl_table[ssk->sk_protocol].mc_list) | |
999 | do_one_set_err(sk, &info); | |
1000 | ||
1001 | read_unlock(&nl_table_lock); | |
1002 | } | |
1003 | ||
9a4595bc PM |
1004 | static int netlink_setsockopt(struct socket *sock, int level, int optname, |
1005 | char __user *optval, int optlen) | |
1006 | { | |
1007 | struct sock *sk = sock->sk; | |
1008 | struct netlink_sock *nlk = nlk_sk(sk); | |
1009 | int val = 0, err; | |
1010 | ||
1011 | if (level != SOL_NETLINK) | |
1012 | return -ENOPROTOOPT; | |
1013 | ||
1014 | if (optlen >= sizeof(int) && | |
1015 | get_user(val, (int __user *)optval)) | |
1016 | return -EFAULT; | |
1017 | ||
1018 | switch (optname) { | |
1019 | case NETLINK_PKTINFO: | |
1020 | if (val) | |
1021 | nlk->flags |= NETLINK_RECV_PKTINFO; | |
1022 | else | |
1023 | nlk->flags &= ~NETLINK_RECV_PKTINFO; | |
1024 | err = 0; | |
1025 | break; | |
1026 | case NETLINK_ADD_MEMBERSHIP: | |
1027 | case NETLINK_DROP_MEMBERSHIP: { | |
1028 | unsigned int subscriptions; | |
1029 | int old, new = optname == NETLINK_ADD_MEMBERSHIP ? 1 : 0; | |
1030 | ||
1031 | if (!netlink_capable(sock, NL_NONROOT_RECV)) | |
1032 | return -EPERM; | |
513c2500 PM |
1033 | if (nlk->groups == NULL) { |
1034 | err = netlink_alloc_groups(sk); | |
1035 | if (err) | |
1036 | return err; | |
1037 | } | |
9a4595bc PM |
1038 | if (!val || val - 1 >= nlk->ngroups) |
1039 | return -EINVAL; | |
1040 | netlink_table_grab(); | |
1041 | old = test_bit(val - 1, nlk->groups); | |
1042 | subscriptions = nlk->subscriptions - old + new; | |
1043 | if (new) | |
1044 | __set_bit(val - 1, nlk->groups); | |
1045 | else | |
1046 | __clear_bit(val - 1, nlk->groups); | |
1047 | netlink_update_subscriptions(sk, subscriptions); | |
4277a083 | 1048 | netlink_update_listeners(sk); |
9a4595bc PM |
1049 | netlink_table_ungrab(); |
1050 | err = 0; | |
1051 | break; | |
1052 | } | |
1053 | default: | |
1054 | err = -ENOPROTOOPT; | |
1055 | } | |
1056 | return err; | |
1057 | } | |
1058 | ||
1059 | static int netlink_getsockopt(struct socket *sock, int level, int optname, | |
1060 | char __user *optval, int __user *optlen) | |
1061 | { | |
1062 | struct sock *sk = sock->sk; | |
1063 | struct netlink_sock *nlk = nlk_sk(sk); | |
1064 | int len, val, err; | |
1065 | ||
1066 | if (level != SOL_NETLINK) | |
1067 | return -ENOPROTOOPT; | |
1068 | ||
1069 | if (get_user(len, optlen)) | |
1070 | return -EFAULT; | |
1071 | if (len < 0) | |
1072 | return -EINVAL; | |
1073 | ||
1074 | switch (optname) { | |
1075 | case NETLINK_PKTINFO: | |
1076 | if (len < sizeof(int)) | |
1077 | return -EINVAL; | |
1078 | len = sizeof(int); | |
1079 | val = nlk->flags & NETLINK_RECV_PKTINFO ? 1 : 0; | |
1080 | put_user(len, optlen); | |
1081 | put_user(val, optval); | |
1082 | err = 0; | |
1083 | break; | |
1084 | default: | |
1085 | err = -ENOPROTOOPT; | |
1086 | } | |
1087 | return err; | |
1088 | } | |
1089 | ||
1090 | static void netlink_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) | |
1091 | { | |
1092 | struct nl_pktinfo info; | |
1093 | ||
1094 | info.group = NETLINK_CB(skb).dst_group; | |
1095 | put_cmsg(msg, SOL_NETLINK, NETLINK_PKTINFO, sizeof(info), &info); | |
1096 | } | |
1097 | ||
1da177e4 LT |
1098 | static inline void netlink_rcv_wake(struct sock *sk) |
1099 | { | |
1100 | struct netlink_sock *nlk = nlk_sk(sk); | |
1101 | ||
b03efcfb | 1102 | if (skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
1103 | clear_bit(0, &nlk->state); |
1104 | if (!test_bit(0, &nlk->state)) | |
1105 | wake_up_interruptible(&nlk->wait); | |
1106 | } | |
1107 | ||
1108 | static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
1109 | struct msghdr *msg, size_t len) | |
1110 | { | |
1111 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); | |
1112 | struct sock *sk = sock->sk; | |
1113 | struct netlink_sock *nlk = nlk_sk(sk); | |
1114 | struct sockaddr_nl *addr=msg->msg_name; | |
1115 | u32 dst_pid; | |
d629b836 | 1116 | u32 dst_group; |
1da177e4 LT |
1117 | struct sk_buff *skb; |
1118 | int err; | |
1119 | struct scm_cookie scm; | |
1120 | ||
1121 | if (msg->msg_flags&MSG_OOB) | |
1122 | return -EOPNOTSUPP; | |
1123 | ||
1124 | if (NULL == siocb->scm) | |
1125 | siocb->scm = &scm; | |
1126 | err = scm_send(sock, msg, siocb->scm); | |
1127 | if (err < 0) | |
1128 | return err; | |
1129 | ||
1130 | if (msg->msg_namelen) { | |
1131 | if (addr->nl_family != AF_NETLINK) | |
1132 | return -EINVAL; | |
1133 | dst_pid = addr->nl_pid; | |
d629b836 PM |
1134 | dst_group = ffs(addr->nl_groups); |
1135 | if (dst_group && !netlink_capable(sock, NL_NONROOT_SEND)) | |
1da177e4 LT |
1136 | return -EPERM; |
1137 | } else { | |
1138 | dst_pid = nlk->dst_pid; | |
d629b836 | 1139 | dst_group = nlk->dst_group; |
1da177e4 LT |
1140 | } |
1141 | ||
1142 | if (!nlk->pid) { | |
1143 | err = netlink_autobind(sock); | |
1144 | if (err) | |
1145 | goto out; | |
1146 | } | |
1147 | ||
1148 | err = -EMSGSIZE; | |
1149 | if (len > sk->sk_sndbuf - 32) | |
1150 | goto out; | |
1151 | err = -ENOBUFS; | |
1152 | skb = alloc_skb(len, GFP_KERNEL); | |
1153 | if (skb==NULL) | |
1154 | goto out; | |
1155 | ||
1156 | NETLINK_CB(skb).pid = nlk->pid; | |
1da177e4 | 1157 | NETLINK_CB(skb).dst_pid = dst_pid; |
d629b836 | 1158 | NETLINK_CB(skb).dst_group = dst_group; |
c94c257c | 1159 | NETLINK_CB(skb).loginuid = audit_get_loginuid(current->audit_context); |
1da177e4 LT |
1160 | memcpy(NETLINK_CREDS(skb), &siocb->scm->creds, sizeof(struct ucred)); |
1161 | ||
1162 | /* What can I do? Netlink is asynchronous, so that | |
1163 | we will have to save current capabilities to | |
1164 | check them, when this message will be delivered | |
1165 | to corresponding kernel module. --ANK (980802) | |
1166 | */ | |
1167 | ||
1168 | err = -EFAULT; | |
1169 | if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len)) { | |
1170 | kfree_skb(skb); | |
1171 | goto out; | |
1172 | } | |
1173 | ||
1174 | err = security_netlink_send(sk, skb); | |
1175 | if (err) { | |
1176 | kfree_skb(skb); | |
1177 | goto out; | |
1178 | } | |
1179 | ||
d629b836 | 1180 | if (dst_group) { |
1da177e4 | 1181 | atomic_inc(&skb->users); |
d629b836 | 1182 | netlink_broadcast(sk, skb, dst_pid, dst_group, GFP_KERNEL); |
1da177e4 LT |
1183 | } |
1184 | err = netlink_unicast(sk, skb, dst_pid, msg->msg_flags&MSG_DONTWAIT); | |
1185 | ||
1186 | out: | |
1187 | return err; | |
1188 | } | |
1189 | ||
1190 | static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock, | |
1191 | struct msghdr *msg, size_t len, | |
1192 | int flags) | |
1193 | { | |
1194 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); | |
1195 | struct scm_cookie scm; | |
1196 | struct sock *sk = sock->sk; | |
1197 | struct netlink_sock *nlk = nlk_sk(sk); | |
1198 | int noblock = flags&MSG_DONTWAIT; | |
1199 | size_t copied; | |
1200 | struct sk_buff *skb; | |
1201 | int err; | |
1202 | ||
1203 | if (flags&MSG_OOB) | |
1204 | return -EOPNOTSUPP; | |
1205 | ||
1206 | copied = 0; | |
1207 | ||
1208 | skb = skb_recv_datagram(sk,flags,noblock,&err); | |
1209 | if (skb==NULL) | |
1210 | goto out; | |
1211 | ||
1212 | msg->msg_namelen = 0; | |
1213 | ||
1214 | copied = skb->len; | |
1215 | if (len < copied) { | |
1216 | msg->msg_flags |= MSG_TRUNC; | |
1217 | copied = len; | |
1218 | } | |
1219 | ||
1220 | skb->h.raw = skb->data; | |
1221 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1222 | ||
1223 | if (msg->msg_name) { | |
1224 | struct sockaddr_nl *addr = (struct sockaddr_nl*)msg->msg_name; | |
1225 | addr->nl_family = AF_NETLINK; | |
1226 | addr->nl_pad = 0; | |
1227 | addr->nl_pid = NETLINK_CB(skb).pid; | |
d629b836 | 1228 | addr->nl_groups = netlink_group_mask(NETLINK_CB(skb).dst_group); |
1da177e4 LT |
1229 | msg->msg_namelen = sizeof(*addr); |
1230 | } | |
1231 | ||
cc9a06cd PM |
1232 | if (nlk->flags & NETLINK_RECV_PKTINFO) |
1233 | netlink_cmsg_recv_pktinfo(msg, skb); | |
1234 | ||
1da177e4 LT |
1235 | if (NULL == siocb->scm) { |
1236 | memset(&scm, 0, sizeof(scm)); | |
1237 | siocb->scm = &scm; | |
1238 | } | |
1239 | siocb->scm->creds = *NETLINK_CREDS(skb); | |
1240 | skb_free_datagram(sk, skb); | |
1241 | ||
1242 | if (nlk->cb && atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf / 2) | |
1243 | netlink_dump(sk); | |
1244 | ||
1245 | scm_recv(sock, msg, siocb->scm, flags); | |
1246 | ||
1247 | out: | |
1248 | netlink_rcv_wake(sk); | |
1249 | return err ? : copied; | |
1250 | } | |
1251 | ||
1252 | static void netlink_data_ready(struct sock *sk, int len) | |
1253 | { | |
1254 | struct netlink_sock *nlk = nlk_sk(sk); | |
1255 | ||
1256 | if (nlk->data_ready) | |
1257 | nlk->data_ready(sk, len); | |
1258 | netlink_rcv_wake(sk); | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * We export these functions to other modules. They provide a | |
1263 | * complete set of kernel non-blocking support for message | |
1264 | * queueing. | |
1265 | */ | |
1266 | ||
1267 | struct sock * | |
06628607 PM |
1268 | netlink_kernel_create(int unit, unsigned int groups, |
1269 | void (*input)(struct sock *sk, int len), | |
1270 | struct module *module) | |
1da177e4 LT |
1271 | { |
1272 | struct socket *sock; | |
1273 | struct sock *sk; | |
77247bbb | 1274 | struct netlink_sock *nlk; |
4277a083 | 1275 | unsigned long *listeners = NULL; |
1da177e4 LT |
1276 | |
1277 | if (!nl_table) | |
1278 | return NULL; | |
1279 | ||
1280 | if (unit<0 || unit>=MAX_LINKS) | |
1281 | return NULL; | |
1282 | ||
1283 | if (sock_create_lite(PF_NETLINK, SOCK_DGRAM, unit, &sock)) | |
1284 | return NULL; | |
1285 | ||
ab33a171 | 1286 | if (__netlink_create(sock, unit) < 0) |
77247bbb | 1287 | goto out_sock_release; |
4fdb3bb7 | 1288 | |
4277a083 PM |
1289 | if (groups < 32) |
1290 | groups = 32; | |
1291 | ||
1292 | listeners = kzalloc(NLGRPSZ(groups), GFP_KERNEL); | |
1293 | if (!listeners) | |
1294 | goto out_sock_release; | |
1295 | ||
1da177e4 LT |
1296 | sk = sock->sk; |
1297 | sk->sk_data_ready = netlink_data_ready; | |
1298 | if (input) | |
1299 | nlk_sk(sk)->data_ready = input; | |
1300 | ||
77247bbb PM |
1301 | if (netlink_insert(sk, 0)) |
1302 | goto out_sock_release; | |
4fdb3bb7 | 1303 | |
77247bbb PM |
1304 | nlk = nlk_sk(sk); |
1305 | nlk->flags |= NETLINK_KERNEL_SOCKET; | |
4fdb3bb7 | 1306 | |
4fdb3bb7 | 1307 | netlink_table_grab(); |
4277a083 PM |
1308 | nl_table[unit].groups = groups; |
1309 | nl_table[unit].listeners = listeners; | |
77247bbb | 1310 | nl_table[unit].module = module; |
ab33a171 | 1311 | nl_table[unit].registered = 1; |
4fdb3bb7 | 1312 | netlink_table_ungrab(); |
77247bbb PM |
1313 | |
1314 | return sk; | |
1315 | ||
4fdb3bb7 | 1316 | out_sock_release: |
4277a083 | 1317 | kfree(listeners); |
4fdb3bb7 | 1318 | sock_release(sock); |
77247bbb | 1319 | return NULL; |
1da177e4 LT |
1320 | } |
1321 | ||
1322 | void netlink_set_nonroot(int protocol, unsigned int flags) | |
1323 | { | |
1324 | if ((unsigned int)protocol < MAX_LINKS) | |
1325 | nl_table[protocol].nl_nonroot = flags; | |
1326 | } | |
1327 | ||
1328 | static void netlink_destroy_callback(struct netlink_callback *cb) | |
1329 | { | |
1330 | if (cb->skb) | |
1331 | kfree_skb(cb->skb); | |
1332 | kfree(cb); | |
1333 | } | |
1334 | ||
1335 | /* | |
1336 | * It looks a bit ugly. | |
1337 | * It would be better to create kernel thread. | |
1338 | */ | |
1339 | ||
1340 | static int netlink_dump(struct sock *sk) | |
1341 | { | |
1342 | struct netlink_sock *nlk = nlk_sk(sk); | |
1343 | struct netlink_callback *cb; | |
1344 | struct sk_buff *skb; | |
1345 | struct nlmsghdr *nlh; | |
1346 | int len; | |
1347 | ||
1348 | skb = sock_rmalloc(sk, NLMSG_GOODSIZE, 0, GFP_KERNEL); | |
1349 | if (!skb) | |
1350 | return -ENOBUFS; | |
1351 | ||
1352 | spin_lock(&nlk->cb_lock); | |
1353 | ||
1354 | cb = nlk->cb; | |
1355 | if (cb == NULL) { | |
1356 | spin_unlock(&nlk->cb_lock); | |
1357 | kfree_skb(skb); | |
1358 | return -EINVAL; | |
1359 | } | |
1360 | ||
1361 | len = cb->dump(skb, cb); | |
1362 | ||
1363 | if (len > 0) { | |
1364 | spin_unlock(&nlk->cb_lock); | |
1365 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
1366 | sk->sk_data_ready(sk, len); | |
1367 | return 0; | |
1368 | } | |
1369 | ||
1797754e | 1370 | nlh = NLMSG_NEW_ANSWER(skb, cb, NLMSG_DONE, sizeof(len), NLM_F_MULTI); |
1da177e4 LT |
1371 | memcpy(NLMSG_DATA(nlh), &len, sizeof(len)); |
1372 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
1373 | sk->sk_data_ready(sk, skb->len); | |
1374 | ||
a8f74b22 TG |
1375 | if (cb->done) |
1376 | cb->done(cb); | |
1da177e4 LT |
1377 | nlk->cb = NULL; |
1378 | spin_unlock(&nlk->cb_lock); | |
1379 | ||
1380 | netlink_destroy_callback(cb); | |
1da177e4 | 1381 | return 0; |
1797754e TG |
1382 | |
1383 | nlmsg_failure: | |
1384 | return -ENOBUFS; | |
1da177e4 LT |
1385 | } |
1386 | ||
1387 | int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, | |
1388 | struct nlmsghdr *nlh, | |
1389 | int (*dump)(struct sk_buff *skb, struct netlink_callback*), | |
1390 | int (*done)(struct netlink_callback*)) | |
1391 | { | |
1392 | struct netlink_callback *cb; | |
1393 | struct sock *sk; | |
1394 | struct netlink_sock *nlk; | |
1395 | ||
1396 | cb = kmalloc(sizeof(*cb), GFP_KERNEL); | |
1397 | if (cb == NULL) | |
1398 | return -ENOBUFS; | |
1399 | ||
1400 | memset(cb, 0, sizeof(*cb)); | |
1401 | cb->dump = dump; | |
1402 | cb->done = done; | |
1403 | cb->nlh = nlh; | |
1404 | atomic_inc(&skb->users); | |
1405 | cb->skb = skb; | |
1406 | ||
1407 | sk = netlink_lookup(ssk->sk_protocol, NETLINK_CB(skb).pid); | |
1408 | if (sk == NULL) { | |
1409 | netlink_destroy_callback(cb); | |
1410 | return -ECONNREFUSED; | |
1411 | } | |
1412 | nlk = nlk_sk(sk); | |
1413 | /* A dump is in progress... */ | |
1414 | spin_lock(&nlk->cb_lock); | |
1415 | if (nlk->cb) { | |
1416 | spin_unlock(&nlk->cb_lock); | |
1417 | netlink_destroy_callback(cb); | |
1418 | sock_put(sk); | |
1419 | return -EBUSY; | |
1420 | } | |
1421 | nlk->cb = cb; | |
1da177e4 LT |
1422 | spin_unlock(&nlk->cb_lock); |
1423 | ||
1424 | netlink_dump(sk); | |
1425 | sock_put(sk); | |
1426 | return 0; | |
1427 | } | |
1428 | ||
1429 | void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err) | |
1430 | { | |
1431 | struct sk_buff *skb; | |
1432 | struct nlmsghdr *rep; | |
1433 | struct nlmsgerr *errmsg; | |
1434 | int size; | |
1435 | ||
1436 | if (err == 0) | |
1437 | size = NLMSG_SPACE(sizeof(struct nlmsgerr)); | |
1438 | else | |
1439 | size = NLMSG_SPACE(4 + NLMSG_ALIGN(nlh->nlmsg_len)); | |
1440 | ||
1441 | skb = alloc_skb(size, GFP_KERNEL); | |
1442 | if (!skb) { | |
1443 | struct sock *sk; | |
1444 | ||
1445 | sk = netlink_lookup(in_skb->sk->sk_protocol, | |
1446 | NETLINK_CB(in_skb).pid); | |
1447 | if (sk) { | |
1448 | sk->sk_err = ENOBUFS; | |
1449 | sk->sk_error_report(sk); | |
1450 | sock_put(sk); | |
1451 | } | |
1452 | return; | |
1453 | } | |
1454 | ||
1455 | rep = __nlmsg_put(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, | |
1797754e | 1456 | NLMSG_ERROR, sizeof(struct nlmsgerr), 0); |
1da177e4 LT |
1457 | errmsg = NLMSG_DATA(rep); |
1458 | errmsg->error = err; | |
1459 | memcpy(&errmsg->msg, nlh, err ? nlh->nlmsg_len : sizeof(struct nlmsghdr)); | |
1460 | netlink_unicast(in_skb->sk, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); | |
1461 | } | |
1462 | ||
82ace47a TG |
1463 | static int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *, |
1464 | struct nlmsghdr *, int *)) | |
1465 | { | |
1466 | unsigned int total_len; | |
1467 | struct nlmsghdr *nlh; | |
1468 | int err; | |
1469 | ||
1470 | while (skb->len >= nlmsg_total_size(0)) { | |
1471 | nlh = (struct nlmsghdr *) skb->data; | |
1472 | ||
ad8e4b75 | 1473 | if (nlh->nlmsg_len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len) |
82ace47a TG |
1474 | return 0; |
1475 | ||
1476 | total_len = min(NLMSG_ALIGN(nlh->nlmsg_len), skb->len); | |
1477 | ||
1478 | if (cb(skb, nlh, &err) < 0) { | |
1479 | /* Not an error, but we have to interrupt processing | |
1480 | * here. Note: that in this case we do not pull | |
1481 | * message from skb, it will be processed later. | |
1482 | */ | |
1483 | if (err == 0) | |
1484 | return -1; | |
1485 | netlink_ack(skb, nlh, err); | |
1486 | } else if (nlh->nlmsg_flags & NLM_F_ACK) | |
1487 | netlink_ack(skb, nlh, 0); | |
1488 | ||
1489 | skb_pull(skb, total_len); | |
1490 | } | |
1491 | ||
1492 | return 0; | |
1493 | } | |
1494 | ||
1495 | /** | |
1496 | * nelink_run_queue - Process netlink receive queue. | |
1497 | * @sk: Netlink socket containing the queue | |
1498 | * @qlen: Place to store queue length upon entry | |
1499 | * @cb: Callback function invoked for each netlink message found | |
1500 | * | |
1501 | * Processes as much as there was in the queue upon entry and invokes | |
1502 | * a callback function for each netlink message found. The callback | |
1503 | * function may refuse a message by returning a negative error code | |
1504 | * but setting the error pointer to 0 in which case this function | |
1505 | * returns with a qlen != 0. | |
1506 | * | |
1507 | * qlen must be initialized to 0 before the initial entry, afterwards | |
1508 | * the function may be called repeatedly until qlen reaches 0. | |
1509 | */ | |
1510 | void netlink_run_queue(struct sock *sk, unsigned int *qlen, | |
1511 | int (*cb)(struct sk_buff *, struct nlmsghdr *, int *)) | |
1512 | { | |
1513 | struct sk_buff *skb; | |
1514 | ||
1515 | if (!*qlen || *qlen > skb_queue_len(&sk->sk_receive_queue)) | |
1516 | *qlen = skb_queue_len(&sk->sk_receive_queue); | |
1517 | ||
1518 | for (; *qlen; (*qlen)--) { | |
1519 | skb = skb_dequeue(&sk->sk_receive_queue); | |
1520 | if (netlink_rcv_skb(skb, cb)) { | |
1521 | if (skb->len) | |
1522 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1523 | else { | |
1524 | kfree_skb(skb); | |
1525 | (*qlen)--; | |
1526 | } | |
1527 | break; | |
1528 | } | |
1529 | ||
1530 | kfree_skb(skb); | |
1531 | } | |
1532 | } | |
1533 | ||
1534 | /** | |
1535 | * netlink_queue_skip - Skip netlink message while processing queue. | |
1536 | * @nlh: Netlink message to be skipped | |
1537 | * @skb: Socket buffer containing the netlink messages. | |
1538 | * | |
1539 | * Pulls the given netlink message off the socket buffer so the next | |
1540 | * call to netlink_queue_run() will not reconsider the message. | |
1541 | */ | |
1542 | void netlink_queue_skip(struct nlmsghdr *nlh, struct sk_buff *skb) | |
1543 | { | |
1544 | int msglen = NLMSG_ALIGN(nlh->nlmsg_len); | |
1545 | ||
1546 | if (msglen > skb->len) | |
1547 | msglen = skb->len; | |
1548 | ||
1549 | skb_pull(skb, msglen); | |
1550 | } | |
1da177e4 LT |
1551 | |
1552 | #ifdef CONFIG_PROC_FS | |
1553 | struct nl_seq_iter { | |
1554 | int link; | |
1555 | int hash_idx; | |
1556 | }; | |
1557 | ||
1558 | static struct sock *netlink_seq_socket_idx(struct seq_file *seq, loff_t pos) | |
1559 | { | |
1560 | struct nl_seq_iter *iter = seq->private; | |
1561 | int i, j; | |
1562 | struct sock *s; | |
1563 | struct hlist_node *node; | |
1564 | loff_t off = 0; | |
1565 | ||
1566 | for (i=0; i<MAX_LINKS; i++) { | |
1567 | struct nl_pid_hash *hash = &nl_table[i].hash; | |
1568 | ||
1569 | for (j = 0; j <= hash->mask; j++) { | |
1570 | sk_for_each(s, node, &hash->table[j]) { | |
1571 | if (off == pos) { | |
1572 | iter->link = i; | |
1573 | iter->hash_idx = j; | |
1574 | return s; | |
1575 | } | |
1576 | ++off; | |
1577 | } | |
1578 | } | |
1579 | } | |
1580 | return NULL; | |
1581 | } | |
1582 | ||
1583 | static void *netlink_seq_start(struct seq_file *seq, loff_t *pos) | |
1584 | { | |
1585 | read_lock(&nl_table_lock); | |
1586 | return *pos ? netlink_seq_socket_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
1587 | } | |
1588 | ||
1589 | static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1590 | { | |
1591 | struct sock *s; | |
1592 | struct nl_seq_iter *iter; | |
1593 | int i, j; | |
1594 | ||
1595 | ++*pos; | |
1596 | ||
1597 | if (v == SEQ_START_TOKEN) | |
1598 | return netlink_seq_socket_idx(seq, 0); | |
1599 | ||
1600 | s = sk_next(v); | |
1601 | if (s) | |
1602 | return s; | |
1603 | ||
1604 | iter = seq->private; | |
1605 | i = iter->link; | |
1606 | j = iter->hash_idx + 1; | |
1607 | ||
1608 | do { | |
1609 | struct nl_pid_hash *hash = &nl_table[i].hash; | |
1610 | ||
1611 | for (; j <= hash->mask; j++) { | |
1612 | s = sk_head(&hash->table[j]); | |
1613 | if (s) { | |
1614 | iter->link = i; | |
1615 | iter->hash_idx = j; | |
1616 | return s; | |
1617 | } | |
1618 | } | |
1619 | ||
1620 | j = 0; | |
1621 | } while (++i < MAX_LINKS); | |
1622 | ||
1623 | return NULL; | |
1624 | } | |
1625 | ||
1626 | static void netlink_seq_stop(struct seq_file *seq, void *v) | |
1627 | { | |
1628 | read_unlock(&nl_table_lock); | |
1629 | } | |
1630 | ||
1631 | ||
1632 | static int netlink_seq_show(struct seq_file *seq, void *v) | |
1633 | { | |
1634 | if (v == SEQ_START_TOKEN) | |
1635 | seq_puts(seq, | |
1636 | "sk Eth Pid Groups " | |
1637 | "Rmem Wmem Dump Locks\n"); | |
1638 | else { | |
1639 | struct sock *s = v; | |
1640 | struct netlink_sock *nlk = nlk_sk(s); | |
1641 | ||
1642 | seq_printf(seq, "%p %-3d %-6d %08x %-8d %-8d %p %d\n", | |
1643 | s, | |
1644 | s->sk_protocol, | |
1645 | nlk->pid, | |
513c2500 | 1646 | nlk->groups ? (u32)nlk->groups[0] : 0, |
1da177e4 LT |
1647 | atomic_read(&s->sk_rmem_alloc), |
1648 | atomic_read(&s->sk_wmem_alloc), | |
1649 | nlk->cb, | |
1650 | atomic_read(&s->sk_refcnt) | |
1651 | ); | |
1652 | ||
1653 | } | |
1654 | return 0; | |
1655 | } | |
1656 | ||
1657 | static struct seq_operations netlink_seq_ops = { | |
1658 | .start = netlink_seq_start, | |
1659 | .next = netlink_seq_next, | |
1660 | .stop = netlink_seq_stop, | |
1661 | .show = netlink_seq_show, | |
1662 | }; | |
1663 | ||
1664 | ||
1665 | static int netlink_seq_open(struct inode *inode, struct file *file) | |
1666 | { | |
1667 | struct seq_file *seq; | |
1668 | struct nl_seq_iter *iter; | |
1669 | int err; | |
1670 | ||
1671 | iter = kmalloc(sizeof(*iter), GFP_KERNEL); | |
1672 | if (!iter) | |
1673 | return -ENOMEM; | |
1674 | ||
1675 | err = seq_open(file, &netlink_seq_ops); | |
1676 | if (err) { | |
1677 | kfree(iter); | |
1678 | return err; | |
1679 | } | |
1680 | ||
1681 | memset(iter, 0, sizeof(*iter)); | |
1682 | seq = file->private_data; | |
1683 | seq->private = iter; | |
1684 | return 0; | |
1685 | } | |
1686 | ||
1687 | static struct file_operations netlink_seq_fops = { | |
1688 | .owner = THIS_MODULE, | |
1689 | .open = netlink_seq_open, | |
1690 | .read = seq_read, | |
1691 | .llseek = seq_lseek, | |
1692 | .release = seq_release_private, | |
1693 | }; | |
1694 | ||
1695 | #endif | |
1696 | ||
1697 | int netlink_register_notifier(struct notifier_block *nb) | |
1698 | { | |
e041c683 | 1699 | return atomic_notifier_chain_register(&netlink_chain, nb); |
1da177e4 LT |
1700 | } |
1701 | ||
1702 | int netlink_unregister_notifier(struct notifier_block *nb) | |
1703 | { | |
e041c683 | 1704 | return atomic_notifier_chain_unregister(&netlink_chain, nb); |
1da177e4 LT |
1705 | } |
1706 | ||
90ddc4f0 | 1707 | static const struct proto_ops netlink_ops = { |
1da177e4 LT |
1708 | .family = PF_NETLINK, |
1709 | .owner = THIS_MODULE, | |
1710 | .release = netlink_release, | |
1711 | .bind = netlink_bind, | |
1712 | .connect = netlink_connect, | |
1713 | .socketpair = sock_no_socketpair, | |
1714 | .accept = sock_no_accept, | |
1715 | .getname = netlink_getname, | |
1716 | .poll = datagram_poll, | |
1717 | .ioctl = sock_no_ioctl, | |
1718 | .listen = sock_no_listen, | |
1719 | .shutdown = sock_no_shutdown, | |
9a4595bc PM |
1720 | .setsockopt = netlink_setsockopt, |
1721 | .getsockopt = netlink_getsockopt, | |
1da177e4 LT |
1722 | .sendmsg = netlink_sendmsg, |
1723 | .recvmsg = netlink_recvmsg, | |
1724 | .mmap = sock_no_mmap, | |
1725 | .sendpage = sock_no_sendpage, | |
1726 | }; | |
1727 | ||
1728 | static struct net_proto_family netlink_family_ops = { | |
1729 | .family = PF_NETLINK, | |
1730 | .create = netlink_create, | |
1731 | .owner = THIS_MODULE, /* for consistency 8) */ | |
1732 | }; | |
1733 | ||
1734 | extern void netlink_skb_parms_too_large(void); | |
1735 | ||
1736 | static int __init netlink_proto_init(void) | |
1737 | { | |
1738 | struct sk_buff *dummy_skb; | |
1739 | int i; | |
1740 | unsigned long max; | |
1741 | unsigned int order; | |
1742 | int err = proto_register(&netlink_proto, 0); | |
1743 | ||
1744 | if (err != 0) | |
1745 | goto out; | |
1746 | ||
1747 | if (sizeof(struct netlink_skb_parms) > sizeof(dummy_skb->cb)) | |
1748 | netlink_skb_parms_too_large(); | |
1749 | ||
1750 | nl_table = kmalloc(sizeof(*nl_table) * MAX_LINKS, GFP_KERNEL); | |
1751 | if (!nl_table) { | |
1752 | enomem: | |
1753 | printk(KERN_CRIT "netlink_init: Cannot allocate nl_table\n"); | |
1754 | return -ENOMEM; | |
1755 | } | |
1756 | ||
1757 | memset(nl_table, 0, sizeof(*nl_table) * MAX_LINKS); | |
1758 | ||
1759 | if (num_physpages >= (128 * 1024)) | |
1760 | max = num_physpages >> (21 - PAGE_SHIFT); | |
1761 | else | |
1762 | max = num_physpages >> (23 - PAGE_SHIFT); | |
1763 | ||
1764 | order = get_bitmask_order(max) - 1 + PAGE_SHIFT; | |
1765 | max = (1UL << order) / sizeof(struct hlist_head); | |
1766 | order = get_bitmask_order(max > UINT_MAX ? UINT_MAX : max) - 1; | |
1767 | ||
1768 | for (i = 0; i < MAX_LINKS; i++) { | |
1769 | struct nl_pid_hash *hash = &nl_table[i].hash; | |
1770 | ||
1771 | hash->table = nl_pid_hash_alloc(1 * sizeof(*hash->table)); | |
1772 | if (!hash->table) { | |
1773 | while (i-- > 0) | |
1774 | nl_pid_hash_free(nl_table[i].hash.table, | |
1775 | 1 * sizeof(*hash->table)); | |
1776 | kfree(nl_table); | |
1777 | goto enomem; | |
1778 | } | |
1779 | memset(hash->table, 0, 1 * sizeof(*hash->table)); | |
1780 | hash->max_shift = order; | |
1781 | hash->shift = 0; | |
1782 | hash->mask = 0; | |
1783 | hash->rehash_time = jiffies; | |
1784 | } | |
1785 | ||
1786 | sock_register(&netlink_family_ops); | |
1787 | #ifdef CONFIG_PROC_FS | |
1788 | proc_net_fops_create("netlink", 0, &netlink_seq_fops); | |
1789 | #endif | |
1790 | /* The netlink device handler may be needed early. */ | |
1791 | rtnetlink_init(); | |
1792 | out: | |
1793 | return err; | |
1794 | } | |
1795 | ||
1da177e4 | 1796 | core_initcall(netlink_proto_init); |
1da177e4 LT |
1797 | |
1798 | EXPORT_SYMBOL(netlink_ack); | |
82ace47a TG |
1799 | EXPORT_SYMBOL(netlink_run_queue); |
1800 | EXPORT_SYMBOL(netlink_queue_skip); | |
1da177e4 LT |
1801 | EXPORT_SYMBOL(netlink_broadcast); |
1802 | EXPORT_SYMBOL(netlink_dump_start); | |
1803 | EXPORT_SYMBOL(netlink_kernel_create); | |
1804 | EXPORT_SYMBOL(netlink_register_notifier); | |
1805 | EXPORT_SYMBOL(netlink_set_err); | |
1806 | EXPORT_SYMBOL(netlink_set_nonroot); | |
1807 | EXPORT_SYMBOL(netlink_unicast); | |
1808 | EXPORT_SYMBOL(netlink_unregister_notifier); | |
1809 |