2 * NETLINK Kernel-user communication protocol.
4 * Authors: Alan Cox <alan@redhat.com>
5 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
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.
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)
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
24 #include <linux/module.h>
26 #include <linux/capability.h>
27 #include <linux/kernel.h>
28 #include <linux/init.h>
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>
36 #include <linux/fcntl.h>
37 #include <linux/termios.h>
38 #include <linux/sockios.h>
39 #include <linux/net.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/notifier.h>
49 #include <linux/security.h>
50 #include <linux/jhash.h>
51 #include <linux/jiffies.h>
52 #include <linux/random.h>
53 #include <linux/bitops.h>
55 #include <linux/types.h>
56 #include <linux/audit.h>
57 #include <linux/selinux.h>
58 #include <linux/mutex.h>
62 #include <net/netlink.h>
64 #define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8)
67 /* struct sock has to be the first member of netlink_sock */
75 unsigned long *groups
;
77 wait_queue_head_t wait
;
78 struct netlink_callback
*cb
;
79 struct mutex
*cb_mutex
;
80 struct mutex cb_def_mutex
;
81 void (*data_ready
)(struct sock
*sk
, int bytes
);
82 struct module
*module
;
85 #define NETLINK_KERNEL_SOCKET 0x1
86 #define NETLINK_RECV_PKTINFO 0x2
88 static inline struct netlink_sock
*nlk_sk(struct sock
*sk
)
90 return (struct netlink_sock
*)sk
;
94 struct hlist_head
*table
;
95 unsigned long rehash_time
;
100 unsigned int entries
;
101 unsigned int max_shift
;
106 struct netlink_table
{
107 struct nl_pid_hash hash
;
108 struct hlist_head mc_list
;
109 unsigned long *listeners
;
110 unsigned int nl_nonroot
;
112 struct mutex
*cb_mutex
;
113 struct module
*module
;
117 static struct netlink_table
*nl_table
;
119 static DECLARE_WAIT_QUEUE_HEAD(nl_table_wait
);
121 static int netlink_dump(struct sock
*sk
);
122 static void netlink_destroy_callback(struct netlink_callback
*cb
);
123 static void netlink_queue_skip(struct nlmsghdr
*nlh
, struct sk_buff
*skb
);
125 static DEFINE_RWLOCK(nl_table_lock
);
126 static atomic_t nl_table_users
= ATOMIC_INIT(0);
128 static ATOMIC_NOTIFIER_HEAD(netlink_chain
);
130 static u32
netlink_group_mask(u32 group
)
132 return group
? 1 << (group
- 1) : 0;
135 static struct hlist_head
*nl_pid_hashfn(struct nl_pid_hash
*hash
, u32 pid
)
137 return &hash
->table
[jhash_1word(pid
, hash
->rnd
) & hash
->mask
];
140 static void netlink_sock_destruct(struct sock
*sk
)
142 struct netlink_sock
*nlk
= nlk_sk(sk
);
146 nlk
->cb
->done(nlk
->cb
);
147 netlink_destroy_callback(nlk
->cb
);
150 skb_queue_purge(&sk
->sk_receive_queue
);
152 if (!sock_flag(sk
, SOCK_DEAD
)) {
153 printk("Freeing alive netlink socket %p\n", sk
);
156 BUG_TRAP(!atomic_read(&sk
->sk_rmem_alloc
));
157 BUG_TRAP(!atomic_read(&sk
->sk_wmem_alloc
));
158 BUG_TRAP(!nlk_sk(sk
)->groups
);
161 /* This lock without WQ_FLAG_EXCLUSIVE is good on UP and it is _very_ bad on SMP.
162 * Look, when several writers sleep and reader wakes them up, all but one
163 * immediately hit write lock and grab all the cpus. Exclusive sleep solves
164 * this, _but_ remember, it adds useless work on UP machines.
167 static void netlink_table_grab(void)
169 write_lock_irq(&nl_table_lock
);
171 if (atomic_read(&nl_table_users
)) {
172 DECLARE_WAITQUEUE(wait
, current
);
174 add_wait_queue_exclusive(&nl_table_wait
, &wait
);
176 set_current_state(TASK_UNINTERRUPTIBLE
);
177 if (atomic_read(&nl_table_users
) == 0)
179 write_unlock_irq(&nl_table_lock
);
181 write_lock_irq(&nl_table_lock
);
184 __set_current_state(TASK_RUNNING
);
185 remove_wait_queue(&nl_table_wait
, &wait
);
189 static __inline__
void netlink_table_ungrab(void)
191 write_unlock_irq(&nl_table_lock
);
192 wake_up(&nl_table_wait
);
195 static __inline__
void
196 netlink_lock_table(void)
198 /* read_lock() synchronizes us to netlink_table_grab */
200 read_lock(&nl_table_lock
);
201 atomic_inc(&nl_table_users
);
202 read_unlock(&nl_table_lock
);
205 static __inline__
void
206 netlink_unlock_table(void)
208 if (atomic_dec_and_test(&nl_table_users
))
209 wake_up(&nl_table_wait
);
212 static __inline__
struct sock
*netlink_lookup(int protocol
, u32 pid
)
214 struct nl_pid_hash
*hash
= &nl_table
[protocol
].hash
;
215 struct hlist_head
*head
;
217 struct hlist_node
*node
;
219 read_lock(&nl_table_lock
);
220 head
= nl_pid_hashfn(hash
, pid
);
221 sk_for_each(sk
, node
, head
) {
222 if (nlk_sk(sk
)->pid
== pid
) {
229 read_unlock(&nl_table_lock
);
233 static inline struct hlist_head
*nl_pid_hash_alloc(size_t size
)
235 if (size
<= PAGE_SIZE
)
236 return kmalloc(size
, GFP_ATOMIC
);
238 return (struct hlist_head
*)
239 __get_free_pages(GFP_ATOMIC
, get_order(size
));
242 static inline void nl_pid_hash_free(struct hlist_head
*table
, size_t size
)
244 if (size
<= PAGE_SIZE
)
247 free_pages((unsigned long)table
, get_order(size
));
250 static int nl_pid_hash_rehash(struct nl_pid_hash
*hash
, int grow
)
252 unsigned int omask
, mask
, shift
;
254 struct hlist_head
*otable
, *table
;
257 omask
= mask
= hash
->mask
;
258 osize
= size
= (mask
+ 1) * sizeof(*table
);
262 if (++shift
> hash
->max_shift
)
268 table
= nl_pid_hash_alloc(size
);
272 memset(table
, 0, size
);
273 otable
= hash
->table
;
277 get_random_bytes(&hash
->rnd
, sizeof(hash
->rnd
));
279 for (i
= 0; i
<= omask
; i
++) {
281 struct hlist_node
*node
, *tmp
;
283 sk_for_each_safe(sk
, node
, tmp
, &otable
[i
])
284 __sk_add_node(sk
, nl_pid_hashfn(hash
, nlk_sk(sk
)->pid
));
287 nl_pid_hash_free(otable
, osize
);
288 hash
->rehash_time
= jiffies
+ 10 * 60 * HZ
;
292 static inline int nl_pid_hash_dilute(struct nl_pid_hash
*hash
, int len
)
294 int avg
= hash
->entries
>> hash
->shift
;
296 if (unlikely(avg
> 1) && nl_pid_hash_rehash(hash
, 1))
299 if (unlikely(len
> avg
) && time_after(jiffies
, hash
->rehash_time
)) {
300 nl_pid_hash_rehash(hash
, 0);
307 static const struct proto_ops netlink_ops
;
310 netlink_update_listeners(struct sock
*sk
)
312 struct netlink_table
*tbl
= &nl_table
[sk
->sk_protocol
];
313 struct hlist_node
*node
;
317 for (i
= 0; i
< NLGRPSZ(tbl
->groups
)/sizeof(unsigned long); i
++) {
319 sk_for_each_bound(sk
, node
, &tbl
->mc_list
)
320 mask
|= nlk_sk(sk
)->groups
[i
];
321 tbl
->listeners
[i
] = mask
;
323 /* this function is only called with the netlink table "grabbed", which
324 * makes sure updates are visible before bind or setsockopt return. */
327 static int netlink_insert(struct sock
*sk
, u32 pid
)
329 struct nl_pid_hash
*hash
= &nl_table
[sk
->sk_protocol
].hash
;
330 struct hlist_head
*head
;
331 int err
= -EADDRINUSE
;
333 struct hlist_node
*node
;
336 netlink_table_grab();
337 head
= nl_pid_hashfn(hash
, pid
);
339 sk_for_each(osk
, node
, head
) {
340 if (nlk_sk(osk
)->pid
== pid
)
352 if (BITS_PER_LONG
> 32 && unlikely(hash
->entries
>= UINT_MAX
))
355 if (len
&& nl_pid_hash_dilute(hash
, len
))
356 head
= nl_pid_hashfn(hash
, pid
);
358 nlk_sk(sk
)->pid
= pid
;
359 sk_add_node(sk
, head
);
363 netlink_table_ungrab();
367 static void netlink_remove(struct sock
*sk
)
369 netlink_table_grab();
370 if (sk_del_node_init(sk
))
371 nl_table
[sk
->sk_protocol
].hash
.entries
--;
372 if (nlk_sk(sk
)->subscriptions
)
373 __sk_del_bind_node(sk
);
374 netlink_table_ungrab();
377 static struct proto netlink_proto
= {
379 .owner
= THIS_MODULE
,
380 .obj_size
= sizeof(struct netlink_sock
),
383 static int __netlink_create(struct socket
*sock
, struct mutex
*cb_mutex
,
387 struct netlink_sock
*nlk
;
389 sock
->ops
= &netlink_ops
;
391 sk
= sk_alloc(PF_NETLINK
, GFP_KERNEL
, &netlink_proto
, 1);
395 sock_init_data(sock
, sk
);
399 nlk
->cb_mutex
= cb_mutex
;
401 nlk
->cb_mutex
= &nlk
->cb_def_mutex
;
402 mutex_init(nlk
->cb_mutex
);
404 init_waitqueue_head(&nlk
->wait
);
406 sk
->sk_destruct
= netlink_sock_destruct
;
407 sk
->sk_protocol
= protocol
;
411 static int netlink_create(struct socket
*sock
, int protocol
)
413 struct module
*module
= NULL
;
414 struct mutex
*cb_mutex
;
415 struct netlink_sock
*nlk
;
418 sock
->state
= SS_UNCONNECTED
;
420 if (sock
->type
!= SOCK_RAW
&& sock
->type
!= SOCK_DGRAM
)
421 return -ESOCKTNOSUPPORT
;
423 if (protocol
<0 || protocol
>= MAX_LINKS
)
424 return -EPROTONOSUPPORT
;
426 netlink_lock_table();
428 if (!nl_table
[protocol
].registered
) {
429 netlink_unlock_table();
430 request_module("net-pf-%d-proto-%d", PF_NETLINK
, protocol
);
431 netlink_lock_table();
434 if (nl_table
[protocol
].registered
&&
435 try_module_get(nl_table
[protocol
].module
))
436 module
= nl_table
[protocol
].module
;
437 cb_mutex
= nl_table
[protocol
].cb_mutex
;
438 netlink_unlock_table();
440 if ((err
= __netlink_create(sock
, cb_mutex
, protocol
)) < 0)
443 nlk
= nlk_sk(sock
->sk
);
444 nlk
->module
= module
;
453 static int netlink_release(struct socket
*sock
)
455 struct sock
*sk
= sock
->sk
;
456 struct netlink_sock
*nlk
;
466 * OK. Socket is unlinked, any packets that arrive now
471 wake_up_interruptible_all(&nlk
->wait
);
473 skb_queue_purge(&sk
->sk_write_queue
);
475 if (nlk
->pid
&& !nlk
->subscriptions
) {
476 struct netlink_notify n
= {
477 .protocol
= sk
->sk_protocol
,
480 atomic_notifier_call_chain(&netlink_chain
,
481 NETLINK_URELEASE
, &n
);
484 module_put(nlk
->module
);
486 netlink_table_grab();
487 if (nlk
->flags
& NETLINK_KERNEL_SOCKET
) {
488 kfree(nl_table
[sk
->sk_protocol
].listeners
);
489 nl_table
[sk
->sk_protocol
].module
= NULL
;
490 nl_table
[sk
->sk_protocol
].registered
= 0;
491 } else if (nlk
->subscriptions
)
492 netlink_update_listeners(sk
);
493 netlink_table_ungrab();
502 static int netlink_autobind(struct socket
*sock
)
504 struct sock
*sk
= sock
->sk
;
505 struct nl_pid_hash
*hash
= &nl_table
[sk
->sk_protocol
].hash
;
506 struct hlist_head
*head
;
508 struct hlist_node
*node
;
509 s32 pid
= current
->tgid
;
511 static s32 rover
= -4097;
515 netlink_table_grab();
516 head
= nl_pid_hashfn(hash
, pid
);
517 sk_for_each(osk
, node
, head
) {
518 if (nlk_sk(osk
)->pid
== pid
) {
519 /* Bind collision, search negative pid values. */
523 netlink_table_ungrab();
527 netlink_table_ungrab();
529 err
= netlink_insert(sk
, pid
);
530 if (err
== -EADDRINUSE
)
533 /* If 2 threads race to autobind, that is fine. */
540 static inline int netlink_capable(struct socket
*sock
, unsigned int flag
)
542 return (nl_table
[sock
->sk
->sk_protocol
].nl_nonroot
& flag
) ||
543 capable(CAP_NET_ADMIN
);
547 netlink_update_subscriptions(struct sock
*sk
, unsigned int subscriptions
)
549 struct netlink_sock
*nlk
= nlk_sk(sk
);
551 if (nlk
->subscriptions
&& !subscriptions
)
552 __sk_del_bind_node(sk
);
553 else if (!nlk
->subscriptions
&& subscriptions
)
554 sk_add_bind_node(sk
, &nl_table
[sk
->sk_protocol
].mc_list
);
555 nlk
->subscriptions
= subscriptions
;
558 static int netlink_alloc_groups(struct sock
*sk
)
560 struct netlink_sock
*nlk
= nlk_sk(sk
);
564 netlink_lock_table();
565 groups
= nl_table
[sk
->sk_protocol
].groups
;
566 if (!nl_table
[sk
->sk_protocol
].registered
)
568 netlink_unlock_table();
573 nlk
->groups
= kzalloc(NLGRPSZ(groups
), GFP_KERNEL
);
574 if (nlk
->groups
== NULL
)
576 nlk
->ngroups
= groups
;
580 static int netlink_bind(struct socket
*sock
, struct sockaddr
*addr
, int addr_len
)
582 struct sock
*sk
= sock
->sk
;
583 struct netlink_sock
*nlk
= nlk_sk(sk
);
584 struct sockaddr_nl
*nladdr
= (struct sockaddr_nl
*)addr
;
587 if (nladdr
->nl_family
!= AF_NETLINK
)
590 /* Only superuser is allowed to listen multicasts */
591 if (nladdr
->nl_groups
) {
592 if (!netlink_capable(sock
, NL_NONROOT_RECV
))
594 if (nlk
->groups
== NULL
) {
595 err
= netlink_alloc_groups(sk
);
602 if (nladdr
->nl_pid
!= nlk
->pid
)
605 err
= nladdr
->nl_pid
?
606 netlink_insert(sk
, nladdr
->nl_pid
) :
607 netlink_autobind(sock
);
612 if (!nladdr
->nl_groups
&& (nlk
->groups
== NULL
|| !(u32
)nlk
->groups
[0]))
615 netlink_table_grab();
616 netlink_update_subscriptions(sk
, nlk
->subscriptions
+
617 hweight32(nladdr
->nl_groups
) -
618 hweight32(nlk
->groups
[0]));
619 nlk
->groups
[0] = (nlk
->groups
[0] & ~0xffffffffUL
) | nladdr
->nl_groups
;
620 netlink_update_listeners(sk
);
621 netlink_table_ungrab();
626 static int netlink_connect(struct socket
*sock
, struct sockaddr
*addr
,
630 struct sock
*sk
= sock
->sk
;
631 struct netlink_sock
*nlk
= nlk_sk(sk
);
632 struct sockaddr_nl
*nladdr
=(struct sockaddr_nl
*)addr
;
634 if (addr
->sa_family
== AF_UNSPEC
) {
635 sk
->sk_state
= NETLINK_UNCONNECTED
;
640 if (addr
->sa_family
!= AF_NETLINK
)
643 /* Only superuser is allowed to send multicasts */
644 if (nladdr
->nl_groups
&& !netlink_capable(sock
, NL_NONROOT_SEND
))
648 err
= netlink_autobind(sock
);
651 sk
->sk_state
= NETLINK_CONNECTED
;
652 nlk
->dst_pid
= nladdr
->nl_pid
;
653 nlk
->dst_group
= ffs(nladdr
->nl_groups
);
659 static int netlink_getname(struct socket
*sock
, struct sockaddr
*addr
, int *addr_len
, int peer
)
661 struct sock
*sk
= sock
->sk
;
662 struct netlink_sock
*nlk
= nlk_sk(sk
);
663 struct sockaddr_nl
*nladdr
=(struct sockaddr_nl
*)addr
;
665 nladdr
->nl_family
= AF_NETLINK
;
667 *addr_len
= sizeof(*nladdr
);
670 nladdr
->nl_pid
= nlk
->dst_pid
;
671 nladdr
->nl_groups
= netlink_group_mask(nlk
->dst_group
);
673 nladdr
->nl_pid
= nlk
->pid
;
674 nladdr
->nl_groups
= nlk
->groups
? nlk
->groups
[0] : 0;
679 static void netlink_overrun(struct sock
*sk
)
681 if (!test_and_set_bit(0, &nlk_sk(sk
)->state
)) {
682 sk
->sk_err
= ENOBUFS
;
683 sk
->sk_error_report(sk
);
687 static struct sock
*netlink_getsockbypid(struct sock
*ssk
, u32 pid
)
689 int protocol
= ssk
->sk_protocol
;
691 struct netlink_sock
*nlk
;
693 sock
= netlink_lookup(protocol
, pid
);
695 return ERR_PTR(-ECONNREFUSED
);
697 /* Don't bother queuing skb if kernel socket has no input function */
699 if ((nlk
->pid
== 0 && !nlk
->data_ready
) ||
700 (sock
->sk_state
== NETLINK_CONNECTED
&&
701 nlk
->dst_pid
!= nlk_sk(ssk
)->pid
)) {
703 return ERR_PTR(-ECONNREFUSED
);
708 struct sock
*netlink_getsockbyfilp(struct file
*filp
)
710 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
713 if (!S_ISSOCK(inode
->i_mode
))
714 return ERR_PTR(-ENOTSOCK
);
716 sock
= SOCKET_I(inode
)->sk
;
717 if (sock
->sk_family
!= AF_NETLINK
)
718 return ERR_PTR(-EINVAL
);
725 * Attach a skb to a netlink socket.
726 * The caller must hold a reference to the destination socket. On error, the
727 * reference is dropped. The skb is not send to the destination, just all
728 * all error checks are performed and memory in the queue is reserved.
730 * < 0: error. skb freed, reference to sock dropped.
732 * 1: repeat lookup - reference dropped while waiting for socket memory.
734 int netlink_attachskb(struct sock
*sk
, struct sk_buff
*skb
, int nonblock
,
735 long timeo
, struct sock
*ssk
)
737 struct netlink_sock
*nlk
;
741 if (atomic_read(&sk
->sk_rmem_alloc
) > sk
->sk_rcvbuf
||
742 test_bit(0, &nlk
->state
)) {
743 DECLARE_WAITQUEUE(wait
, current
);
745 if (!ssk
|| nlk_sk(ssk
)->pid
== 0)
752 __set_current_state(TASK_INTERRUPTIBLE
);
753 add_wait_queue(&nlk
->wait
, &wait
);
755 if ((atomic_read(&sk
->sk_rmem_alloc
) > sk
->sk_rcvbuf
||
756 test_bit(0, &nlk
->state
)) &&
757 !sock_flag(sk
, SOCK_DEAD
))
758 timeo
= schedule_timeout(timeo
);
760 __set_current_state(TASK_RUNNING
);
761 remove_wait_queue(&nlk
->wait
, &wait
);
764 if (signal_pending(current
)) {
766 return sock_intr_errno(timeo
);
770 skb_set_owner_r(skb
, sk
);
774 int netlink_sendskb(struct sock
*sk
, struct sk_buff
*skb
, int protocol
)
778 skb_queue_tail(&sk
->sk_receive_queue
, skb
);
779 sk
->sk_data_ready(sk
, len
);
784 void netlink_detachskb(struct sock
*sk
, struct sk_buff
*skb
)
790 static inline struct sk_buff
*netlink_trim(struct sk_buff
*skb
,
797 delta
= skb
->end
- skb
->tail
;
798 if (delta
* 2 < skb
->truesize
)
801 if (skb_shared(skb
)) {
802 struct sk_buff
*nskb
= skb_clone(skb
, allocation
);
809 if (!pskb_expand_head(skb
, 0, -delta
, allocation
))
810 skb
->truesize
-= delta
;
815 int netlink_unicast(struct sock
*ssk
, struct sk_buff
*skb
, u32 pid
, int nonblock
)
821 skb
= netlink_trim(skb
, gfp_any());
823 timeo
= sock_sndtimeo(ssk
, nonblock
);
825 sk
= netlink_getsockbypid(ssk
, pid
);
830 err
= netlink_attachskb(sk
, skb
, nonblock
, timeo
, ssk
);
836 return netlink_sendskb(sk
, skb
, ssk
->sk_protocol
);
839 int netlink_has_listeners(struct sock
*sk
, unsigned int group
)
843 BUG_ON(!(nlk_sk(sk
)->flags
& NETLINK_KERNEL_SOCKET
));
844 if (group
- 1 < nl_table
[sk
->sk_protocol
].groups
)
845 res
= test_bit(group
- 1, nl_table
[sk
->sk_protocol
].listeners
);
848 EXPORT_SYMBOL_GPL(netlink_has_listeners
);
850 static __inline__
int netlink_broadcast_deliver(struct sock
*sk
, struct sk_buff
*skb
)
852 struct netlink_sock
*nlk
= nlk_sk(sk
);
854 if (atomic_read(&sk
->sk_rmem_alloc
) <= sk
->sk_rcvbuf
&&
855 !test_bit(0, &nlk
->state
)) {
856 skb_set_owner_r(skb
, sk
);
857 skb_queue_tail(&sk
->sk_receive_queue
, skb
);
858 sk
->sk_data_ready(sk
, skb
->len
);
859 return atomic_read(&sk
->sk_rmem_alloc
) > sk
->sk_rcvbuf
;
864 struct netlink_broadcast_data
{
865 struct sock
*exclude_sk
;
872 struct sk_buff
*skb
, *skb2
;
875 static inline int do_one_broadcast(struct sock
*sk
,
876 struct netlink_broadcast_data
*p
)
878 struct netlink_sock
*nlk
= nlk_sk(sk
);
881 if (p
->exclude_sk
== sk
)
884 if (nlk
->pid
== p
->pid
|| p
->group
- 1 >= nlk
->ngroups
||
885 !test_bit(p
->group
- 1, nlk
->groups
))
894 if (p
->skb2
== NULL
) {
895 if (skb_shared(p
->skb
)) {
896 p
->skb2
= skb_clone(p
->skb
, p
->allocation
);
898 p
->skb2
= skb_get(p
->skb
);
900 * skb ownership may have been set when
901 * delivered to a previous socket.
906 if (p
->skb2
== NULL
) {
908 /* Clone failed. Notify ALL listeners. */
910 } else if ((val
= netlink_broadcast_deliver(sk
, p
->skb2
)) < 0) {
923 int netlink_broadcast(struct sock
*ssk
, struct sk_buff
*skb
, u32 pid
,
924 u32 group
, gfp_t allocation
)
926 struct netlink_broadcast_data info
;
927 struct hlist_node
*node
;
930 skb
= netlink_trim(skb
, allocation
);
932 info
.exclude_sk
= ssk
;
938 info
.allocation
= allocation
;
942 /* While we sleep in clone, do not allow to change socket list */
944 netlink_lock_table();
946 sk_for_each_bound(sk
, node
, &nl_table
[ssk
->sk_protocol
].mc_list
)
947 do_one_broadcast(sk
, &info
);
951 netlink_unlock_table();
954 kfree_skb(info
.skb2
);
956 if (info
.delivered
) {
957 if (info
.congested
&& (allocation
& __GFP_WAIT
))
966 struct netlink_set_err_data
{
967 struct sock
*exclude_sk
;
973 static inline int do_one_set_err(struct sock
*sk
,
974 struct netlink_set_err_data
*p
)
976 struct netlink_sock
*nlk
= nlk_sk(sk
);
978 if (sk
== p
->exclude_sk
)
981 if (nlk
->pid
== p
->pid
|| p
->group
- 1 >= nlk
->ngroups
||
982 !test_bit(p
->group
- 1, nlk
->groups
))
985 sk
->sk_err
= p
->code
;
986 sk
->sk_error_report(sk
);
991 void netlink_set_err(struct sock
*ssk
, u32 pid
, u32 group
, int code
)
993 struct netlink_set_err_data info
;
994 struct hlist_node
*node
;
997 info
.exclude_sk
= ssk
;
1002 read_lock(&nl_table_lock
);
1004 sk_for_each_bound(sk
, node
, &nl_table
[ssk
->sk_protocol
].mc_list
)
1005 do_one_set_err(sk
, &info
);
1007 read_unlock(&nl_table_lock
);
1010 static int netlink_setsockopt(struct socket
*sock
, int level
, int optname
,
1011 char __user
*optval
, int optlen
)
1013 struct sock
*sk
= sock
->sk
;
1014 struct netlink_sock
*nlk
= nlk_sk(sk
);
1015 unsigned int val
= 0;
1018 if (level
!= SOL_NETLINK
)
1019 return -ENOPROTOOPT
;
1021 if (optlen
>= sizeof(int) &&
1022 get_user(val
, (unsigned int __user
*)optval
))
1026 case NETLINK_PKTINFO
:
1028 nlk
->flags
|= NETLINK_RECV_PKTINFO
;
1030 nlk
->flags
&= ~NETLINK_RECV_PKTINFO
;
1033 case NETLINK_ADD_MEMBERSHIP
:
1034 case NETLINK_DROP_MEMBERSHIP
: {
1035 unsigned int subscriptions
;
1036 int old
, new = optname
== NETLINK_ADD_MEMBERSHIP
? 1 : 0;
1038 if (!netlink_capable(sock
, NL_NONROOT_RECV
))
1040 if (nlk
->groups
== NULL
) {
1041 err
= netlink_alloc_groups(sk
);
1045 if (!val
|| val
- 1 >= nlk
->ngroups
)
1047 netlink_table_grab();
1048 old
= test_bit(val
- 1, nlk
->groups
);
1049 subscriptions
= nlk
->subscriptions
- old
+ new;
1051 __set_bit(val
- 1, nlk
->groups
);
1053 __clear_bit(val
- 1, nlk
->groups
);
1054 netlink_update_subscriptions(sk
, subscriptions
);
1055 netlink_update_listeners(sk
);
1056 netlink_table_ungrab();
1066 static int netlink_getsockopt(struct socket
*sock
, int level
, int optname
,
1067 char __user
*optval
, int __user
*optlen
)
1069 struct sock
*sk
= sock
->sk
;
1070 struct netlink_sock
*nlk
= nlk_sk(sk
);
1073 if (level
!= SOL_NETLINK
)
1074 return -ENOPROTOOPT
;
1076 if (get_user(len
, optlen
))
1082 case NETLINK_PKTINFO
:
1083 if (len
< sizeof(int))
1086 val
= nlk
->flags
& NETLINK_RECV_PKTINFO
? 1 : 0;
1087 if (put_user(len
, optlen
) ||
1088 put_user(val
, optval
))
1098 static void netlink_cmsg_recv_pktinfo(struct msghdr
*msg
, struct sk_buff
*skb
)
1100 struct nl_pktinfo info
;
1102 info
.group
= NETLINK_CB(skb
).dst_group
;
1103 put_cmsg(msg
, SOL_NETLINK
, NETLINK_PKTINFO
, sizeof(info
), &info
);
1106 static inline void netlink_rcv_wake(struct sock
*sk
)
1108 struct netlink_sock
*nlk
= nlk_sk(sk
);
1110 if (skb_queue_empty(&sk
->sk_receive_queue
))
1111 clear_bit(0, &nlk
->state
);
1112 if (!test_bit(0, &nlk
->state
))
1113 wake_up_interruptible(&nlk
->wait
);
1116 static int netlink_sendmsg(struct kiocb
*kiocb
, struct socket
*sock
,
1117 struct msghdr
*msg
, size_t len
)
1119 struct sock_iocb
*siocb
= kiocb_to_siocb(kiocb
);
1120 struct sock
*sk
= sock
->sk
;
1121 struct netlink_sock
*nlk
= nlk_sk(sk
);
1122 struct sockaddr_nl
*addr
=msg
->msg_name
;
1125 struct sk_buff
*skb
;
1127 struct scm_cookie scm
;
1129 if (msg
->msg_flags
&MSG_OOB
)
1132 if (NULL
== siocb
->scm
)
1134 err
= scm_send(sock
, msg
, siocb
->scm
);
1138 if (msg
->msg_namelen
) {
1139 if (addr
->nl_family
!= AF_NETLINK
)
1141 dst_pid
= addr
->nl_pid
;
1142 dst_group
= ffs(addr
->nl_groups
);
1143 if (dst_group
&& !netlink_capable(sock
, NL_NONROOT_SEND
))
1146 dst_pid
= nlk
->dst_pid
;
1147 dst_group
= nlk
->dst_group
;
1151 err
= netlink_autobind(sock
);
1157 if (len
> sk
->sk_sndbuf
- 32)
1160 skb
= alloc_skb(len
, GFP_KERNEL
);
1164 NETLINK_CB(skb
).pid
= nlk
->pid
;
1165 NETLINK_CB(skb
).dst_group
= dst_group
;
1166 NETLINK_CB(skb
).loginuid
= audit_get_loginuid(current
->audit_context
);
1167 selinux_get_task_sid(current
, &(NETLINK_CB(skb
).sid
));
1168 memcpy(NETLINK_CREDS(skb
), &siocb
->scm
->creds
, sizeof(struct ucred
));
1170 /* What can I do? Netlink is asynchronous, so that
1171 we will have to save current capabilities to
1172 check them, when this message will be delivered
1173 to corresponding kernel module. --ANK (980802)
1177 if (memcpy_fromiovec(skb_put(skb
,len
), msg
->msg_iov
, len
)) {
1182 err
= security_netlink_send(sk
, skb
);
1189 atomic_inc(&skb
->users
);
1190 netlink_broadcast(sk
, skb
, dst_pid
, dst_group
, GFP_KERNEL
);
1192 err
= netlink_unicast(sk
, skb
, dst_pid
, msg
->msg_flags
&MSG_DONTWAIT
);
1198 static int netlink_recvmsg(struct kiocb
*kiocb
, struct socket
*sock
,
1199 struct msghdr
*msg
, size_t len
,
1202 struct sock_iocb
*siocb
= kiocb_to_siocb(kiocb
);
1203 struct scm_cookie scm
;
1204 struct sock
*sk
= sock
->sk
;
1205 struct netlink_sock
*nlk
= nlk_sk(sk
);
1206 int noblock
= flags
&MSG_DONTWAIT
;
1208 struct sk_buff
*skb
;
1216 skb
= skb_recv_datagram(sk
,flags
,noblock
,&err
);
1220 msg
->msg_namelen
= 0;
1224 msg
->msg_flags
|= MSG_TRUNC
;
1228 skb_reset_transport_header(skb
);
1229 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1231 if (msg
->msg_name
) {
1232 struct sockaddr_nl
*addr
= (struct sockaddr_nl
*)msg
->msg_name
;
1233 addr
->nl_family
= AF_NETLINK
;
1235 addr
->nl_pid
= NETLINK_CB(skb
).pid
;
1236 addr
->nl_groups
= netlink_group_mask(NETLINK_CB(skb
).dst_group
);
1237 msg
->msg_namelen
= sizeof(*addr
);
1240 if (nlk
->flags
& NETLINK_RECV_PKTINFO
)
1241 netlink_cmsg_recv_pktinfo(msg
, skb
);
1243 if (NULL
== siocb
->scm
) {
1244 memset(&scm
, 0, sizeof(scm
));
1247 siocb
->scm
->creds
= *NETLINK_CREDS(skb
);
1248 if (flags
& MSG_TRUNC
)
1250 skb_free_datagram(sk
, skb
);
1252 if (nlk
->cb
&& atomic_read(&sk
->sk_rmem_alloc
) <= sk
->sk_rcvbuf
/ 2)
1255 scm_recv(sock
, msg
, siocb
->scm
, flags
);
1257 netlink_rcv_wake(sk
);
1258 return err
? : copied
;
1261 static void netlink_data_ready(struct sock
*sk
, int len
)
1263 struct netlink_sock
*nlk
= nlk_sk(sk
);
1265 if (nlk
->data_ready
)
1266 nlk
->data_ready(sk
, len
);
1267 netlink_rcv_wake(sk
);
1271 * We export these functions to other modules. They provide a
1272 * complete set of kernel non-blocking support for message
1277 netlink_kernel_create(int unit
, unsigned int groups
,
1278 void (*input
)(struct sock
*sk
, int len
),
1279 struct mutex
*cb_mutex
, struct module
*module
)
1281 struct socket
*sock
;
1283 struct netlink_sock
*nlk
;
1284 unsigned long *listeners
= NULL
;
1288 if (unit
<0 || unit
>=MAX_LINKS
)
1291 if (sock_create_lite(PF_NETLINK
, SOCK_DGRAM
, unit
, &sock
))
1294 if (__netlink_create(sock
, cb_mutex
, unit
) < 0)
1295 goto out_sock_release
;
1300 listeners
= kzalloc(NLGRPSZ(groups
), GFP_KERNEL
);
1302 goto out_sock_release
;
1305 sk
->sk_data_ready
= netlink_data_ready
;
1307 nlk_sk(sk
)->data_ready
= input
;
1309 if (netlink_insert(sk
, 0))
1310 goto out_sock_release
;
1313 nlk
->flags
|= NETLINK_KERNEL_SOCKET
;
1315 netlink_table_grab();
1316 nl_table
[unit
].groups
= groups
;
1317 nl_table
[unit
].listeners
= listeners
;
1318 nl_table
[unit
].cb_mutex
= cb_mutex
;
1319 nl_table
[unit
].module
= module
;
1320 nl_table
[unit
].registered
= 1;
1321 netlink_table_ungrab();
1331 void netlink_set_nonroot(int protocol
, unsigned int flags
)
1333 if ((unsigned int)protocol
< MAX_LINKS
)
1334 nl_table
[protocol
].nl_nonroot
= flags
;
1337 static void netlink_destroy_callback(struct netlink_callback
*cb
)
1345 * It looks a bit ugly.
1346 * It would be better to create kernel thread.
1349 static int netlink_dump(struct sock
*sk
)
1351 struct netlink_sock
*nlk
= nlk_sk(sk
);
1352 struct netlink_callback
*cb
;
1353 struct sk_buff
*skb
;
1354 struct nlmsghdr
*nlh
;
1355 int len
, err
= -ENOBUFS
;
1357 skb
= sock_rmalloc(sk
, NLMSG_GOODSIZE
, 0, GFP_KERNEL
);
1361 mutex_lock(nlk
->cb_mutex
);
1369 len
= cb
->dump(skb
, cb
);
1372 mutex_unlock(nlk
->cb_mutex
);
1373 skb_queue_tail(&sk
->sk_receive_queue
, skb
);
1374 sk
->sk_data_ready(sk
, len
);
1378 nlh
= nlmsg_put_answer(skb
, cb
, NLMSG_DONE
, sizeof(len
), NLM_F_MULTI
);
1382 memcpy(nlmsg_data(nlh
), &len
, sizeof(len
));
1384 skb_queue_tail(&sk
->sk_receive_queue
, skb
);
1385 sk
->sk_data_ready(sk
, skb
->len
);
1390 mutex_unlock(nlk
->cb_mutex
);
1392 netlink_destroy_callback(cb
);
1396 mutex_unlock(nlk
->cb_mutex
);
1402 int netlink_dump_start(struct sock
*ssk
, struct sk_buff
*skb
,
1403 struct nlmsghdr
*nlh
,
1404 int (*dump
)(struct sk_buff
*skb
, struct netlink_callback
*),
1405 int (*done
)(struct netlink_callback
*))
1407 struct netlink_callback
*cb
;
1409 struct netlink_sock
*nlk
;
1411 cb
= kzalloc(sizeof(*cb
), GFP_KERNEL
);
1418 atomic_inc(&skb
->users
);
1421 sk
= netlink_lookup(ssk
->sk_protocol
, NETLINK_CB(skb
).pid
);
1423 netlink_destroy_callback(cb
);
1424 return -ECONNREFUSED
;
1427 /* A dump is in progress... */
1428 mutex_lock(nlk
->cb_mutex
);
1430 mutex_unlock(nlk
->cb_mutex
);
1431 netlink_destroy_callback(cb
);
1436 mutex_unlock(nlk
->cb_mutex
);
1441 /* We successfully started a dump, by returning -EINTR we
1442 * signal the queue mangement to interrupt processing of
1443 * any netlink messages so userspace gets a chance to read
1448 void netlink_ack(struct sk_buff
*in_skb
, struct nlmsghdr
*nlh
, int err
)
1450 struct sk_buff
*skb
;
1451 struct nlmsghdr
*rep
;
1452 struct nlmsgerr
*errmsg
;
1453 size_t payload
= sizeof(*errmsg
);
1455 /* error messages get the original request appened */
1457 payload
+= nlmsg_len(nlh
);
1459 skb
= nlmsg_new(payload
, GFP_KERNEL
);
1463 sk
= netlink_lookup(in_skb
->sk
->sk_protocol
,
1464 NETLINK_CB(in_skb
).pid
);
1466 sk
->sk_err
= ENOBUFS
;
1467 sk
->sk_error_report(sk
);
1473 rep
= __nlmsg_put(skb
, NETLINK_CB(in_skb
).pid
, nlh
->nlmsg_seq
,
1474 NLMSG_ERROR
, sizeof(struct nlmsgerr
), 0);
1475 errmsg
= nlmsg_data(rep
);
1476 errmsg
->error
= err
;
1477 memcpy(&errmsg
->msg
, nlh
, err
? nlh
->nlmsg_len
: sizeof(*nlh
));
1478 netlink_unicast(in_skb
->sk
, skb
, NETLINK_CB(in_skb
).pid
, MSG_DONTWAIT
);
1481 static int netlink_rcv_skb(struct sk_buff
*skb
, int (*cb
)(struct sk_buff
*,
1484 struct nlmsghdr
*nlh
;
1487 while (skb
->len
>= nlmsg_total_size(0)) {
1488 nlh
= nlmsg_hdr(skb
);
1491 if (nlh
->nlmsg_len
< NLMSG_HDRLEN
|| skb
->len
< nlh
->nlmsg_len
)
1494 /* Only requests are handled by the kernel */
1495 if (!(nlh
->nlmsg_flags
& NLM_F_REQUEST
))
1498 /* Skip control messages */
1499 if (nlh
->nlmsg_type
< NLMSG_MIN_TYPE
)
1503 if (err
== -EINTR
) {
1504 /* Not an error, but we interrupt processing */
1505 netlink_queue_skip(nlh
, skb
);
1509 if (nlh
->nlmsg_flags
& NLM_F_ACK
|| err
)
1510 netlink_ack(skb
, nlh
, err
);
1512 netlink_queue_skip(nlh
, skb
);
1519 * nelink_run_queue - Process netlink receive queue.
1520 * @sk: Netlink socket containing the queue
1521 * @qlen: Place to store queue length upon entry
1522 * @cb: Callback function invoked for each netlink message found
1524 * Processes as much as there was in the queue upon entry and invokes
1525 * a callback function for each netlink message found. The callback
1526 * function may refuse a message by returning a negative error code
1527 * but setting the error pointer to 0 in which case this function
1528 * returns with a qlen != 0.
1530 * qlen must be initialized to 0 before the initial entry, afterwards
1531 * the function may be called repeatedly until qlen reaches 0.
1533 * The callback function may return -EINTR to signal that processing
1534 * of netlink messages shall be interrupted. In this case the message
1535 * currently being processed will NOT be requeued onto the receive
1538 void netlink_run_queue(struct sock
*sk
, unsigned int *qlen
,
1539 int (*cb
)(struct sk_buff
*, struct nlmsghdr
*))
1541 struct sk_buff
*skb
;
1543 if (!*qlen
|| *qlen
> skb_queue_len(&sk
->sk_receive_queue
))
1544 *qlen
= skb_queue_len(&sk
->sk_receive_queue
);
1546 for (; *qlen
; (*qlen
)--) {
1547 skb
= skb_dequeue(&sk
->sk_receive_queue
);
1548 if (netlink_rcv_skb(skb
, cb
)) {
1550 skb_queue_head(&sk
->sk_receive_queue
, skb
);
1563 * netlink_queue_skip - Skip netlink message while processing queue.
1564 * @nlh: Netlink message to be skipped
1565 * @skb: Socket buffer containing the netlink messages.
1567 * Pulls the given netlink message off the socket buffer so the next
1568 * call to netlink_queue_run() will not reconsider the message.
1570 static void netlink_queue_skip(struct nlmsghdr
*nlh
, struct sk_buff
*skb
)
1572 int msglen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
1574 if (msglen
> skb
->len
)
1577 skb_pull(skb
, msglen
);
1581 * nlmsg_notify - send a notification netlink message
1582 * @sk: netlink socket to use
1583 * @skb: notification message
1584 * @pid: destination netlink pid for reports or 0
1585 * @group: destination multicast group or 0
1586 * @report: 1 to report back, 0 to disable
1587 * @flags: allocation flags
1589 int nlmsg_notify(struct sock
*sk
, struct sk_buff
*skb
, u32 pid
,
1590 unsigned int group
, int report
, gfp_t flags
)
1595 int exclude_pid
= 0;
1598 atomic_inc(&skb
->users
);
1602 /* errors reported via destination sk->sk_err */
1603 nlmsg_multicast(sk
, skb
, exclude_pid
, group
, flags
);
1607 err
= nlmsg_unicast(sk
, skb
, pid
);
1612 #ifdef CONFIG_PROC_FS
1613 struct nl_seq_iter
{
1618 static struct sock
*netlink_seq_socket_idx(struct seq_file
*seq
, loff_t pos
)
1620 struct nl_seq_iter
*iter
= seq
->private;
1623 struct hlist_node
*node
;
1626 for (i
=0; i
<MAX_LINKS
; i
++) {
1627 struct nl_pid_hash
*hash
= &nl_table
[i
].hash
;
1629 for (j
= 0; j
<= hash
->mask
; j
++) {
1630 sk_for_each(s
, node
, &hash
->table
[j
]) {
1643 static void *netlink_seq_start(struct seq_file
*seq
, loff_t
*pos
)
1645 read_lock(&nl_table_lock
);
1646 return *pos
? netlink_seq_socket_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
1649 static void *netlink_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
1652 struct nl_seq_iter
*iter
;
1657 if (v
== SEQ_START_TOKEN
)
1658 return netlink_seq_socket_idx(seq
, 0);
1664 iter
= seq
->private;
1666 j
= iter
->hash_idx
+ 1;
1669 struct nl_pid_hash
*hash
= &nl_table
[i
].hash
;
1671 for (; j
<= hash
->mask
; j
++) {
1672 s
= sk_head(&hash
->table
[j
]);
1681 } while (++i
< MAX_LINKS
);
1686 static void netlink_seq_stop(struct seq_file
*seq
, void *v
)
1688 read_unlock(&nl_table_lock
);
1692 static int netlink_seq_show(struct seq_file
*seq
, void *v
)
1694 if (v
== SEQ_START_TOKEN
)
1696 "sk Eth Pid Groups "
1697 "Rmem Wmem Dump Locks\n");
1700 struct netlink_sock
*nlk
= nlk_sk(s
);
1702 seq_printf(seq
, "%p %-3d %-6d %08x %-8d %-8d %p %d\n",
1706 nlk
->groups
? (u32
)nlk
->groups
[0] : 0,
1707 atomic_read(&s
->sk_rmem_alloc
),
1708 atomic_read(&s
->sk_wmem_alloc
),
1710 atomic_read(&s
->sk_refcnt
)
1717 static const struct seq_operations netlink_seq_ops
= {
1718 .start
= netlink_seq_start
,
1719 .next
= netlink_seq_next
,
1720 .stop
= netlink_seq_stop
,
1721 .show
= netlink_seq_show
,
1725 static int netlink_seq_open(struct inode
*inode
, struct file
*file
)
1727 struct seq_file
*seq
;
1728 struct nl_seq_iter
*iter
;
1731 iter
= kzalloc(sizeof(*iter
), GFP_KERNEL
);
1735 err
= seq_open(file
, &netlink_seq_ops
);
1741 seq
= file
->private_data
;
1742 seq
->private = iter
;
1746 static const struct file_operations netlink_seq_fops
= {
1747 .owner
= THIS_MODULE
,
1748 .open
= netlink_seq_open
,
1750 .llseek
= seq_lseek
,
1751 .release
= seq_release_private
,
1756 int netlink_register_notifier(struct notifier_block
*nb
)
1758 return atomic_notifier_chain_register(&netlink_chain
, nb
);
1761 int netlink_unregister_notifier(struct notifier_block
*nb
)
1763 return atomic_notifier_chain_unregister(&netlink_chain
, nb
);
1766 static const struct proto_ops netlink_ops
= {
1767 .family
= PF_NETLINK
,
1768 .owner
= THIS_MODULE
,
1769 .release
= netlink_release
,
1770 .bind
= netlink_bind
,
1771 .connect
= netlink_connect
,
1772 .socketpair
= sock_no_socketpair
,
1773 .accept
= sock_no_accept
,
1774 .getname
= netlink_getname
,
1775 .poll
= datagram_poll
,
1776 .ioctl
= sock_no_ioctl
,
1777 .listen
= sock_no_listen
,
1778 .shutdown
= sock_no_shutdown
,
1779 .setsockopt
= netlink_setsockopt
,
1780 .getsockopt
= netlink_getsockopt
,
1781 .sendmsg
= netlink_sendmsg
,
1782 .recvmsg
= netlink_recvmsg
,
1783 .mmap
= sock_no_mmap
,
1784 .sendpage
= sock_no_sendpage
,
1787 static struct net_proto_family netlink_family_ops
= {
1788 .family
= PF_NETLINK
,
1789 .create
= netlink_create
,
1790 .owner
= THIS_MODULE
, /* for consistency 8) */
1793 static int __init
netlink_proto_init(void)
1795 struct sk_buff
*dummy_skb
;
1799 int err
= proto_register(&netlink_proto
, 0);
1804 BUILD_BUG_ON(sizeof(struct netlink_skb_parms
) > sizeof(dummy_skb
->cb
));
1806 nl_table
= kcalloc(MAX_LINKS
, sizeof(*nl_table
), GFP_KERNEL
);
1810 if (num_physpages
>= (128 * 1024))
1811 max
= num_physpages
>> (21 - PAGE_SHIFT
);
1813 max
= num_physpages
>> (23 - PAGE_SHIFT
);
1815 order
= get_bitmask_order(max
) - 1 + PAGE_SHIFT
;
1816 max
= (1UL << order
) / sizeof(struct hlist_head
);
1817 order
= get_bitmask_order(max
> UINT_MAX
? UINT_MAX
: max
) - 1;
1819 for (i
= 0; i
< MAX_LINKS
; i
++) {
1820 struct nl_pid_hash
*hash
= &nl_table
[i
].hash
;
1822 hash
->table
= nl_pid_hash_alloc(1 * sizeof(*hash
->table
));
1825 nl_pid_hash_free(nl_table
[i
].hash
.table
,
1826 1 * sizeof(*hash
->table
));
1830 memset(hash
->table
, 0, 1 * sizeof(*hash
->table
));
1831 hash
->max_shift
= order
;
1834 hash
->rehash_time
= jiffies
;
1837 sock_register(&netlink_family_ops
);
1838 #ifdef CONFIG_PROC_FS
1839 proc_net_fops_create("netlink", 0, &netlink_seq_fops
);
1841 /* The netlink device handler may be needed early. */
1846 panic("netlink_init: Cannot allocate nl_table\n");
1849 core_initcall(netlink_proto_init
);
1851 EXPORT_SYMBOL(netlink_ack
);
1852 EXPORT_SYMBOL(netlink_run_queue
);
1853 EXPORT_SYMBOL(netlink_broadcast
);
1854 EXPORT_SYMBOL(netlink_dump_start
);
1855 EXPORT_SYMBOL(netlink_kernel_create
);
1856 EXPORT_SYMBOL(netlink_register_notifier
);
1857 EXPORT_SYMBOL(netlink_set_nonroot
);
1858 EXPORT_SYMBOL(netlink_unicast
);
1859 EXPORT_SYMBOL(netlink_unregister_notifier
);
1860 EXPORT_SYMBOL(nlmsg_notify
);