2 * NET4: Implementation of BSD Unix domain sockets.
4 * Authors: Alan Cox, <alan.cox@linux.org>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
11 * Version: $Id: af_unix.c,v 1.133 2002/02/08 03:57:19 davem Exp $
14 * Linus Torvalds : Assorted bug cures.
15 * Niibe Yutaka : async I/O support.
16 * Carsten Paeth : PF_UNIX check, address fixes.
17 * Alan Cox : Limit size of allocated blocks.
18 * Alan Cox : Fixed the stupid socketpair bug.
19 * Alan Cox : BSD compatibility fine tuning.
20 * Alan Cox : Fixed a bug in connect when interrupted.
21 * Alan Cox : Sorted out a proper draft version of
22 * file descriptor passing hacked up from
24 * Marty Leisner : Fixes to fd passing
25 * Nick Nevin : recvmsg bugfix.
26 * Alan Cox : Started proper garbage collector
27 * Heiko EiBfeldt : Missing verify_area check
28 * Alan Cox : Started POSIXisms
29 * Andreas Schwab : Replace inode by dentry for proper
31 * Kirk Petersen : Made this a module
32 * Christoph Rohland : Elegant non-blocking accept/connect algorithm.
34 * Alexey Kuznetosv : Repaired (I hope) bugs introduces
35 * by above two patches.
36 * Andrea Arcangeli : If possible we block in connect(2)
37 * if the max backlog of the listen socket
38 * is been reached. This won't break
39 * old apps and it will avoid huge amount
40 * of socks hashed (this for unix_gc()
41 * performances reasons).
42 * Security fix that limits the max
43 * number of socks to 2*max_files and
44 * the number of skb queueable in the
46 * Artur Skawina : Hash function optimizations
47 * Alexey Kuznetsov : Full scale SMP. Lot of bugs are introduced 8)
48 * Malcolm Beattie : Set peercred for socketpair
49 * Michal Ostrowski : Module initialization cleanup.
50 * Arnaldo C. Melo : Remove MOD_{INC,DEC}_USE_COUNT,
51 * the core infrastructure is doing that
52 * for all net proto families now (2.5.69+)
55 * Known differences from reference BSD that was tested:
58 * ECONNREFUSED is not returned from one end of a connected() socket to the
59 * other the moment one end closes.
60 * fstat() doesn't return st_dev=0, and give the blksize as high water mark
61 * and a fake inode identifier (nor the BSD first socket fstat twice bug).
63 * accept() returns a path name even if the connecting socket has closed
64 * in the meantime (BSD loses the path and gives up).
65 * accept() returns 0 length path for an unbound connector. BSD returns 16
66 * and a null first byte in the path (but not for gethost/peername - BSD bug ??)
67 * socketpair(...SOCK_RAW..) doesn't panic the kernel.
68 * BSD af_unix apparently has connect forgetting to block properly.
69 * (need to check this with the POSIX spec in detail)
71 * Differences from 2.0.0-11-... (ANK)
72 * Bug fixes and improvements.
73 * - client shutdown killed server socket.
74 * - removed all useless cli/sti pairs.
76 * Semantic changes/extensions.
77 * - generic control message passing.
78 * - SCM_CREDENTIALS control message.
79 * - "Abstract" (not FS based) socket bindings.
80 * Abstract names are sequences of bytes (not zero terminated)
81 * started by 0, so that this name space does not intersect
85 #include <linux/module.h>
86 #include <linux/config.h>
87 #include <linux/kernel.h>
88 #include <linux/signal.h>
89 #include <linux/sched.h>
90 #include <linux/errno.h>
91 #include <linux/string.h>
92 #include <linux/stat.h>
93 #include <linux/dcache.h>
94 #include <linux/namei.h>
95 #include <linux/socket.h>
97 #include <linux/fcntl.h>
98 #include <linux/termios.h>
99 #include <linux/sockios.h>
100 #include <linux/net.h>
101 #include <linux/in.h>
102 #include <linux/fs.h>
103 #include <linux/slab.h>
104 #include <asm/uaccess.h>
105 #include <linux/skbuff.h>
106 #include <linux/netdevice.h>
107 #include <net/sock.h>
108 #include <linux/tcp.h>
109 #include <net/af_unix.h>
110 #include <linux/proc_fs.h>
111 #include <linux/seq_file.h>
113 #include <linux/init.h>
114 #include <linux/poll.h>
115 #include <linux/smp_lock.h>
116 #include <linux/rtnetlink.h>
117 #include <linux/mount.h>
118 #include <net/checksum.h>
119 #include <linux/security.h>
120 #include <linux/vs_context.h>
121 #include <linux/vs_network.h>
122 #include <linux/vs_limit.h>
124 int sysctl_unix_max_dgram_qlen = 10;
126 struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1];
127 DEFINE_RWLOCK(unix_table_lock);
128 static atomic_t unix_nr_socks = ATOMIC_INIT(0);
130 #define unix_sockets_unbound (&unix_socket_table[UNIX_HASH_SIZE])
132 #define UNIX_ABSTRACT(sk) (unix_sk(sk)->addr->hash != UNIX_HASH_SIZE)
135 * SMP locking strategy:
136 * hash table is protected with rwlock unix_table_lock
137 * each socket state is protected by separate rwlock.
140 static inline unsigned unix_hash_fold(unsigned hash)
144 return hash&(UNIX_HASH_SIZE-1);
147 #define unix_peer(sk) (unix_sk(sk)->peer)
149 static inline int unix_our_peer(struct sock *sk, struct sock *osk)
151 return unix_peer(osk) == sk;
154 static inline int unix_may_send(struct sock *sk, struct sock *osk)
156 return (unix_peer(osk) == NULL || unix_our_peer(sk, osk));
159 static struct sock *unix_peer_get(struct sock *s)
167 unix_state_runlock(s);
171 static inline void unix_release_addr(struct unix_address *addr)
173 if (atomic_dec_and_test(&addr->refcnt))
178 * Check unix socket name:
179 * - should be not zero length.
180 * - if started by not zero, should be NULL terminated (FS object)
181 * - if started by zero, it is abstract name.
184 static int unix_mkname(struct sockaddr_un * sunaddr, int len, unsigned *hashp)
186 if (len <= sizeof(short) || len > sizeof(*sunaddr))
188 if (!sunaddr || sunaddr->sun_family != AF_UNIX)
190 if (sunaddr->sun_path[0]) {
192 * This may look like an off by one error but it is a bit more
193 * subtle. 108 is the longest valid AF_UNIX path for a binding.
194 * sun_path[108] doesnt as such exist. However in kernel space
195 * we are guaranteed that it is a valid memory location in our
196 * kernel address buffer.
198 ((char *)sunaddr)[len]=0;
199 len = strlen(sunaddr->sun_path)+1+sizeof(short);
203 *hashp = unix_hash_fold(csum_partial((char*)sunaddr, len, 0));
207 static void __unix_remove_socket(struct sock *sk)
209 sk_del_node_init(sk);
212 static void __unix_insert_socket(struct hlist_head *list, struct sock *sk)
214 BUG_TRAP(sk_unhashed(sk));
215 sk_add_node(sk, list);
218 static inline void unix_remove_socket(struct sock *sk)
220 write_lock(&unix_table_lock);
221 __unix_remove_socket(sk);
222 write_unlock(&unix_table_lock);
225 static inline void unix_insert_socket(struct hlist_head *list, struct sock *sk)
227 write_lock(&unix_table_lock);
228 __unix_insert_socket(list, sk);
229 write_unlock(&unix_table_lock);
232 static struct sock *__unix_find_socket_byname(struct sockaddr_un *sunname,
233 int len, int type, unsigned hash)
236 struct hlist_node *node;
238 sk_for_each(s, node, &unix_socket_table[hash ^ type]) {
239 struct unix_sock *u = unix_sk(s);
241 if (u->addr->len == len &&
242 !memcmp(u->addr->name, sunname, len))
250 static inline struct sock *unix_find_socket_byname(struct sockaddr_un *sunname,
256 read_lock(&unix_table_lock);
257 s = __unix_find_socket_byname(sunname, len, type, hash);
260 read_unlock(&unix_table_lock);
264 static struct sock *unix_find_socket_byinode(struct inode *i)
267 struct hlist_node *node;
269 read_lock(&unix_table_lock);
271 &unix_socket_table[i->i_ino & (UNIX_HASH_SIZE - 1)]) {
272 struct dentry *dentry = unix_sk(s)->dentry;
274 if(dentry && dentry->d_inode == i)
282 read_unlock(&unix_table_lock);
286 static inline int unix_writable(struct sock *sk)
288 return (atomic_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf;
291 static void unix_write_space(struct sock *sk)
293 read_lock(&sk->sk_callback_lock);
294 if (unix_writable(sk)) {
295 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
296 wake_up_interruptible(sk->sk_sleep);
297 sk_wake_async(sk, 2, POLL_OUT);
299 read_unlock(&sk->sk_callback_lock);
302 /* When dgram socket disconnects (or changes its peer), we clear its receive
303 * queue of packets arrived from previous peer. First, it allows to do
304 * flow control based only on wmem_alloc; second, sk connected to peer
305 * may receive messages only from that peer. */
306 static void unix_dgram_disconnected(struct sock *sk, struct sock *other)
308 if (skb_queue_len(&sk->sk_receive_queue)) {
309 skb_queue_purge(&sk->sk_receive_queue);
310 wake_up_interruptible_all(&unix_sk(sk)->peer_wait);
312 /* If one link of bidirectional dgram pipe is disconnected,
313 * we signal error. Messages are lost. Do not make this,
314 * when peer was not connected to us.
316 if (!sock_flag(other, SOCK_DEAD) && unix_peer(other) == sk) {
317 other->sk_err = ECONNRESET;
318 other->sk_error_report(other);
323 static void unix_sock_destructor(struct sock *sk)
325 struct unix_sock *u = unix_sk(sk);
327 skb_queue_purge(&sk->sk_receive_queue);
329 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
330 BUG_TRAP(sk_unhashed(sk));
331 BUG_TRAP(!sk->sk_socket);
332 if (!sock_flag(sk, SOCK_DEAD)) {
333 printk("Attempt to release alive unix socket: %p\n", sk);
338 unix_release_addr(u->addr);
340 atomic_dec(&unix_nr_socks);
341 #ifdef UNIX_REFCNT_DEBUG
342 printk(KERN_DEBUG "UNIX %p is destroyed, %d are still alive.\n", sk, atomic_read(&unix_nr_socks));
346 static int unix_release_sock (struct sock *sk, int embrion)
348 struct unix_sock *u = unix_sk(sk);
349 struct dentry *dentry;
350 struct vfsmount *mnt;
355 unix_remove_socket(sk);
358 unix_state_wlock(sk);
360 sk->sk_shutdown = SHUTDOWN_MASK;
365 state = sk->sk_state;
366 sk->sk_state = TCP_CLOSE;
367 unix_state_wunlock(sk);
369 wake_up_interruptible_all(&u->peer_wait);
371 skpair=unix_peer(sk);
374 if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) {
375 unix_state_wlock(skpair);
377 skpair->sk_shutdown = SHUTDOWN_MASK;
378 if (!skb_queue_empty(&sk->sk_receive_queue) || embrion)
379 skpair->sk_err = ECONNRESET;
380 unix_state_wunlock(skpair);
381 skpair->sk_state_change(skpair);
382 read_lock(&skpair->sk_callback_lock);
383 sk_wake_async(skpair,1,POLL_HUP);
384 read_unlock(&skpair->sk_callback_lock);
386 sock_put(skpair); /* It may now die */
387 unix_peer(sk) = NULL;
390 /* Try to flush out this socket. Throw out buffers at least */
392 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
393 if (state==TCP_LISTEN)
394 unix_release_sock(skb->sk, 1);
395 /* passed fds are erased in the kfree_skb hook */
405 clr_vx_info(&sk->sk_vx_info);
406 clr_nx_info(&sk->sk_nx_info);
409 /* ---- Socket is dead now and most probably destroyed ---- */
412 * Fixme: BSD difference: In BSD all sockets connected to use get
413 * ECONNRESET and we die on the spot. In Linux we behave
414 * like files and pipes do and wait for the last
417 * Can't we simply set sock->err?
419 * What the above comment does talk about? --ANK(980817)
422 if (atomic_read(&unix_tot_inflight))
423 unix_gc(); /* Garbage collect fds */
428 static int unix_listen(struct socket *sock, int backlog)
431 struct sock *sk = sock->sk;
432 struct unix_sock *u = unix_sk(sk);
435 if (sock->type!=SOCK_STREAM && sock->type!=SOCK_SEQPACKET)
436 goto out; /* Only stream/seqpacket sockets accept */
439 goto out; /* No listens on an unbound socket */
440 unix_state_wlock(sk);
441 if (sk->sk_state != TCP_CLOSE && sk->sk_state != TCP_LISTEN)
443 if (backlog > sk->sk_max_ack_backlog)
444 wake_up_interruptible_all(&u->peer_wait);
445 sk->sk_max_ack_backlog = backlog;
446 sk->sk_state = TCP_LISTEN;
447 /* set credentials so connect can copy them */
448 sk->sk_peercred.pid = current->tgid;
449 sk->sk_peercred.uid = current->euid;
450 sk->sk_peercred.gid = current->egid;
454 unix_state_wunlock(sk);
459 static int unix_release(struct socket *);
460 static int unix_bind(struct socket *, struct sockaddr *, int);
461 static int unix_stream_connect(struct socket *, struct sockaddr *,
462 int addr_len, int flags);
463 static int unix_socketpair(struct socket *, struct socket *);
464 static int unix_accept(struct socket *, struct socket *, int);
465 static int unix_getname(struct socket *, struct sockaddr *, int *, int);
466 static unsigned int unix_poll(struct file *, struct socket *, poll_table *);
467 static int unix_ioctl(struct socket *, unsigned int, unsigned long);
468 static int unix_shutdown(struct socket *, int);
469 static int unix_stream_sendmsg(struct kiocb *, struct socket *,
470 struct msghdr *, size_t);
471 static int unix_stream_recvmsg(struct kiocb *, struct socket *,
472 struct msghdr *, size_t, int);
473 static int unix_dgram_sendmsg(struct kiocb *, struct socket *,
474 struct msghdr *, size_t);
475 static int unix_dgram_recvmsg(struct kiocb *, struct socket *,
476 struct msghdr *, size_t, int);
477 static int unix_dgram_connect(struct socket *, struct sockaddr *,
479 static int unix_seqpacket_sendmsg(struct kiocb *, struct socket *,
480 struct msghdr *, size_t);
482 static struct proto_ops unix_stream_ops = {
484 .owner = THIS_MODULE,
485 .release = unix_release,
487 .connect = unix_stream_connect,
488 .socketpair = unix_socketpair,
489 .accept = unix_accept,
490 .getname = unix_getname,
493 .listen = unix_listen,
494 .shutdown = unix_shutdown,
495 .setsockopt = sock_no_setsockopt,
496 .getsockopt = sock_no_getsockopt,
497 .sendmsg = unix_stream_sendmsg,
498 .recvmsg = unix_stream_recvmsg,
499 .mmap = sock_no_mmap,
500 .sendpage = sock_no_sendpage,
503 static struct proto_ops unix_dgram_ops = {
505 .owner = THIS_MODULE,
506 .release = unix_release,
508 .connect = unix_dgram_connect,
509 .socketpair = unix_socketpair,
510 .accept = sock_no_accept,
511 .getname = unix_getname,
512 .poll = datagram_poll,
514 .listen = sock_no_listen,
515 .shutdown = unix_shutdown,
516 .setsockopt = sock_no_setsockopt,
517 .getsockopt = sock_no_getsockopt,
518 .sendmsg = unix_dgram_sendmsg,
519 .recvmsg = unix_dgram_recvmsg,
520 .mmap = sock_no_mmap,
521 .sendpage = sock_no_sendpage,
524 static struct proto_ops unix_seqpacket_ops = {
526 .owner = THIS_MODULE,
527 .release = unix_release,
529 .connect = unix_stream_connect,
530 .socketpair = unix_socketpair,
531 .accept = unix_accept,
532 .getname = unix_getname,
533 .poll = datagram_poll,
535 .listen = unix_listen,
536 .shutdown = unix_shutdown,
537 .setsockopt = sock_no_setsockopt,
538 .getsockopt = sock_no_getsockopt,
539 .sendmsg = unix_seqpacket_sendmsg,
540 .recvmsg = unix_dgram_recvmsg,
541 .mmap = sock_no_mmap,
542 .sendpage = sock_no_sendpage,
545 static struct proto unix_proto = {
547 .owner = THIS_MODULE,
548 .obj_size = sizeof(struct unix_sock),
551 static struct sock * unix_create1(struct socket *sock)
553 struct sock *sk = NULL;
556 if (atomic_read(&unix_nr_socks) >= 2*files_stat.max_files)
559 sk = sk_alloc(PF_UNIX, GFP_KERNEL, &unix_proto, 1);
563 atomic_inc(&unix_nr_socks);
565 sock_init_data(sock,sk);
567 set_vx_info(&sk->sk_vx_info, current->vx_info);
568 sk->sk_xid = vx_current_xid();
570 set_nx_info(&sk->sk_nx_info, current->nx_info);
572 sk->sk_write_space = unix_write_space;
573 sk->sk_max_ack_backlog = sysctl_unix_max_dgram_qlen;
574 sk->sk_destruct = unix_sock_destructor;
578 rwlock_init(&u->lock);
579 atomic_set(&u->inflight, sock ? 0 : -1);
580 init_MUTEX(&u->readsem); /* single task reading lock */
581 init_waitqueue_head(&u->peer_wait);
582 unix_insert_socket(unix_sockets_unbound, sk);
587 static int unix_create(struct socket *sock, int protocol)
589 if (protocol && protocol != PF_UNIX)
590 return -EPROTONOSUPPORT;
592 sock->state = SS_UNCONNECTED;
594 switch (sock->type) {
596 sock->ops = &unix_stream_ops;
599 * Believe it or not BSD has AF_UNIX, SOCK_RAW though
603 sock->type=SOCK_DGRAM;
605 sock->ops = &unix_dgram_ops;
608 sock->ops = &unix_seqpacket_ops;
611 return -ESOCKTNOSUPPORT;
614 return unix_create1(sock) ? 0 : -ENOMEM;
617 static int unix_release(struct socket *sock)
619 struct sock *sk = sock->sk;
626 return unix_release_sock (sk, 0);
629 static int unix_autobind(struct socket *sock)
631 struct sock *sk = sock->sk;
632 struct unix_sock *u = unix_sk(sk);
633 static u32 ordernum = 1;
634 struct unix_address * addr;
644 addr = kmalloc(sizeof(*addr) + sizeof(short) + 16, GFP_KERNEL);
648 memset(addr, 0, sizeof(*addr) + sizeof(short) + 16);
649 addr->name->sun_family = AF_UNIX;
650 atomic_set(&addr->refcnt, 1);
653 addr->len = sprintf(addr->name->sun_path+1, "%05x", ordernum) + 1 + sizeof(short);
654 addr->hash = unix_hash_fold(csum_partial((void*)addr->name, addr->len, 0));
656 write_lock(&unix_table_lock);
657 ordernum = (ordernum+1)&0xFFFFF;
659 if (__unix_find_socket_byname(addr->name, addr->len, sock->type,
661 write_unlock(&unix_table_lock);
662 /* Sanity yield. It is unusual case, but yet... */
663 if (!(ordernum&0xFF))
667 addr->hash ^= sk->sk_type;
669 __unix_remove_socket(sk);
671 __unix_insert_socket(&unix_socket_table[addr->hash], sk);
672 write_unlock(&unix_table_lock);
675 out: up(&u->readsem);
679 static struct sock *unix_find_other(struct sockaddr_un *sunname, int len,
680 int type, unsigned hash, int *error)
686 if (sunname->sun_path[0]) {
687 err = path_lookup(sunname->sun_path, LOOKUP_FOLLOW, &nd);
690 err = permission(nd.dentry->d_inode,MAY_WRITE, &nd);
695 if (!S_ISSOCK(nd.dentry->d_inode->i_mode))
697 u=unix_find_socket_byinode(nd.dentry->d_inode);
701 if (u->sk_type == type)
702 touch_atime(nd.mnt, nd.dentry);
707 if (u->sk_type != type) {
713 u=unix_find_socket_byname(sunname, len, type, hash);
715 struct dentry *dentry;
716 dentry = unix_sk(u)->dentry;
718 touch_atime(unix_sk(u)->mnt, dentry);
732 static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
734 struct sock *sk = sock->sk;
735 struct unix_sock *u = unix_sk(sk);
736 struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr;
737 struct dentry * dentry = NULL;
741 struct unix_address *addr;
742 struct hlist_head *list;
745 if (sunaddr->sun_family != AF_UNIX)
748 if (addr_len==sizeof(short)) {
749 err = unix_autobind(sock);
753 err = unix_mkname(sunaddr, addr_len, &hash);
765 addr = kmalloc(sizeof(*addr)+addr_len, GFP_KERNEL);
769 memcpy(addr->name, sunaddr, addr_len);
770 addr->len = addr_len;
771 addr->hash = hash ^ sk->sk_type;
772 atomic_set(&addr->refcnt, 1);
774 if (sunaddr->sun_path[0]) {
778 * Get the parent directory, calculate the hash for last
781 err = path_lookup(sunaddr->sun_path, LOOKUP_PARENT, &nd);
783 goto out_mknod_parent;
785 dentry = lookup_create(&nd, 0);
786 err = PTR_ERR(dentry);
788 goto out_mknod_unlock;
791 * All right, let's create it.
794 (SOCK_INODE(sock)->i_mode & ~current->fs->umask);
795 err = vfs_mknod(nd.dentry->d_inode, dentry, mode, 0);
798 up(&nd.dentry->d_inode->i_sem);
802 addr->hash = UNIX_HASH_SIZE;
805 write_lock(&unix_table_lock);
807 if (!sunaddr->sun_path[0]) {
809 if (__unix_find_socket_byname(sunaddr, addr_len,
810 sk->sk_type, hash)) {
811 unix_release_addr(addr);
815 list = &unix_socket_table[addr->hash];
817 list = &unix_socket_table[dentry->d_inode->i_ino & (UNIX_HASH_SIZE-1)];
818 u->dentry = nd.dentry;
823 __unix_remove_socket(sk);
825 __unix_insert_socket(list, sk);
828 write_unlock(&unix_table_lock);
837 up(&nd.dentry->d_inode->i_sem);
842 unix_release_addr(addr);
846 static int unix_dgram_connect(struct socket *sock, struct sockaddr *addr,
849 struct sock *sk = sock->sk;
850 struct sockaddr_un *sunaddr=(struct sockaddr_un*)addr;
855 if (addr->sa_family != AF_UNSPEC) {
856 err = unix_mkname(sunaddr, alen, &hash);
861 if (test_bit(SOCK_PASSCRED, &sock->flags) &&
862 !unix_sk(sk)->addr && (err = unix_autobind(sock)) != 0)
865 other=unix_find_other(sunaddr, alen, sock->type, hash, &err);
869 unix_state_wlock(sk);
872 if (!unix_may_send(sk, other))
875 err = security_unix_may_send(sk->sk_socket, other->sk_socket);
881 * 1003.1g breaking connected state with AF_UNSPEC
884 unix_state_wlock(sk);
888 * If it was connected, reconnect.
891 struct sock *old_peer = unix_peer(sk);
893 unix_state_wunlock(sk);
895 if (other != old_peer)
896 unix_dgram_disconnected(sk, old_peer);
900 unix_state_wunlock(sk);
905 unix_state_wunlock(sk);
911 static long unix_wait_for_peer(struct sock *other, long timeo)
913 struct unix_sock *u = unix_sk(other);
917 prepare_to_wait_exclusive(&u->peer_wait, &wait, TASK_INTERRUPTIBLE);
919 sched = !sock_flag(other, SOCK_DEAD) &&
920 !(other->sk_shutdown & RCV_SHUTDOWN) &&
921 (skb_queue_len(&other->sk_receive_queue) >
922 other->sk_max_ack_backlog);
924 unix_state_runlock(other);
927 timeo = schedule_timeout(timeo);
929 finish_wait(&u->peer_wait, &wait);
933 static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr,
934 int addr_len, int flags)
936 struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr;
937 struct sock *sk = sock->sk;
938 struct unix_sock *u = unix_sk(sk), *newu, *otheru;
939 struct sock *newsk = NULL;
940 struct sock *other = NULL;
941 struct sk_buff *skb = NULL;
947 err = unix_mkname(sunaddr, addr_len, &hash);
952 if (test_bit(SOCK_PASSCRED, &sock->flags)
953 && !u->addr && (err = unix_autobind(sock)) != 0)
956 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
958 /* First of all allocate resources.
959 If we will make it after state is locked,
960 we will have to recheck all again in any case.
965 /* create new sock for complete connection */
966 newsk = unix_create1(NULL);
970 /* Allocate skb for sending to listening sock */
971 skb = sock_wmalloc(newsk, 1, 0, GFP_KERNEL);
976 /* Find listening sock. */
977 other = unix_find_other(sunaddr, addr_len, sk->sk_type, hash, &err);
981 /* Latch state of peer */
982 unix_state_rlock(other);
984 /* Apparently VFS overslept socket death. Retry. */
985 if (sock_flag(other, SOCK_DEAD)) {
986 unix_state_runlock(other);
992 if (other->sk_state != TCP_LISTEN)
995 if (skb_queue_len(&other->sk_receive_queue) >
996 other->sk_max_ack_backlog) {
1001 timeo = unix_wait_for_peer(other, timeo);
1003 err = sock_intr_errno(timeo);
1004 if (signal_pending(current))
1012 It is tricky place. We need to grab write lock and cannot
1013 drop lock on peer. It is dangerous because deadlock is
1014 possible. Connect to self case and simultaneous
1015 attempt to connect are eliminated by checking socket
1016 state. other is TCP_LISTEN, if sk is TCP_LISTEN we
1017 check this before attempt to grab lock.
1019 Well, and we have to recheck the state after socket locked.
1025 /* This is ok... continue with connect */
1027 case TCP_ESTABLISHED:
1028 /* Socket is already connected */
1036 unix_state_wlock(sk);
1038 if (sk->sk_state != st) {
1039 unix_state_wunlock(sk);
1040 unix_state_runlock(other);
1045 err = security_unix_stream_connect(sock, other->sk_socket, newsk);
1047 unix_state_wunlock(sk);
1051 /* The way is open! Fastly set all the necessary fields... */
1054 unix_peer(newsk) = sk;
1055 newsk->sk_state = TCP_ESTABLISHED;
1056 newsk->sk_type = sk->sk_type;
1057 newsk->sk_peercred.pid = current->tgid;
1058 newsk->sk_peercred.uid = current->euid;
1059 newsk->sk_peercred.gid = current->egid;
1060 newu = unix_sk(newsk);
1061 newsk->sk_sleep = &newu->peer_wait;
1062 otheru = unix_sk(other);
1064 /* copy address information from listening to new sock*/
1066 atomic_inc(&otheru->addr->refcnt);
1067 newu->addr = otheru->addr;
1069 if (otheru->dentry) {
1070 newu->dentry = dget(otheru->dentry);
1071 newu->mnt = mntget(otheru->mnt);
1074 /* Set credentials */
1075 sk->sk_peercred = other->sk_peercred;
1078 unix_peer(sk) = newsk;
1079 sock->state = SS_CONNECTED;
1080 sk->sk_state = TCP_ESTABLISHED;
1082 unix_state_wunlock(sk);
1084 /* take ten and and send info to listening sock */
1085 spin_lock(&other->sk_receive_queue.lock);
1086 __skb_queue_tail(&other->sk_receive_queue, skb);
1087 /* Undo artificially decreased inflight after embrion
1088 * is installed to listening socket. */
1089 atomic_inc(&newu->inflight);
1090 spin_unlock(&other->sk_receive_queue.lock);
1091 unix_state_runlock(other);
1092 other->sk_data_ready(other, 0);
1098 unix_state_runlock(other);
1104 unix_release_sock(newsk, 0);
1110 static int unix_socketpair(struct socket *socka, struct socket *sockb)
1112 struct sock *ska=socka->sk, *skb = sockb->sk;
1114 /* Join our sockets back to back */
1119 ska->sk_peercred.pid = skb->sk_peercred.pid = current->tgid;
1120 ska->sk_peercred.uid = skb->sk_peercred.uid = current->euid;
1121 ska->sk_peercred.gid = skb->sk_peercred.gid = current->egid;
1123 if (ska->sk_type != SOCK_DGRAM) {
1124 ska->sk_state = TCP_ESTABLISHED;
1125 skb->sk_state = TCP_ESTABLISHED;
1126 socka->state = SS_CONNECTED;
1127 sockb->state = SS_CONNECTED;
1132 static int unix_accept(struct socket *sock, struct socket *newsock, int flags)
1134 struct sock *sk = sock->sk;
1136 struct sk_buff *skb;
1140 if (sock->type!=SOCK_STREAM && sock->type!=SOCK_SEQPACKET)
1144 if (sk->sk_state != TCP_LISTEN)
1147 /* If socket state is TCP_LISTEN it cannot change (for now...),
1148 * so that no locks are necessary.
1151 skb = skb_recv_datagram(sk, 0, flags&O_NONBLOCK, &err);
1153 /* This means receive shutdown. */
1160 skb_free_datagram(sk, skb);
1161 wake_up_interruptible(&unix_sk(sk)->peer_wait);
1163 /* attach accepted sock to socket */
1164 unix_state_wlock(tsk);
1165 newsock->state = SS_CONNECTED;
1166 sock_graft(tsk, newsock);
1167 unix_state_wunlock(tsk);
1175 static int unix_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer)
1177 struct sock *sk = sock->sk;
1178 struct unix_sock *u;
1179 struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr;
1183 sk = unix_peer_get(sk);
1194 unix_state_rlock(sk);
1196 sunaddr->sun_family = AF_UNIX;
1197 sunaddr->sun_path[0] = 0;
1198 *uaddr_len = sizeof(short);
1200 struct unix_address *addr = u->addr;
1202 *uaddr_len = addr->len;
1203 memcpy(sunaddr, addr->name, *uaddr_len);
1205 unix_state_runlock(sk);
1211 static void unix_detach_fds(struct scm_cookie *scm, struct sk_buff *skb)
1215 scm->fp = UNIXCB(skb).fp;
1216 skb->destructor = sock_wfree;
1217 UNIXCB(skb).fp = NULL;
1219 for (i=scm->fp->count-1; i>=0; i--)
1220 unix_notinflight(scm->fp->fp[i]);
1223 static void unix_destruct_fds(struct sk_buff *skb)
1225 struct scm_cookie scm;
1226 memset(&scm, 0, sizeof(scm));
1227 unix_detach_fds(&scm, skb);
1229 /* Alas, it calls VFS */
1230 /* So fscking what? fput() had been SMP-safe since the last Summer */
1235 static void unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb)
1238 for (i=scm->fp->count-1; i>=0; i--)
1239 unix_inflight(scm->fp->fp[i]);
1240 UNIXCB(skb).fp = scm->fp;
1241 skb->destructor = unix_destruct_fds;
1246 * Send AF_UNIX data.
1249 static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock,
1250 struct msghdr *msg, size_t len)
1252 struct sock_iocb *siocb = kiocb_to_siocb(kiocb);
1253 struct sock *sk = sock->sk;
1254 struct unix_sock *u = unix_sk(sk);
1255 struct sockaddr_un *sunaddr=msg->msg_name;
1256 struct sock *other = NULL;
1257 int namelen = 0; /* fake GCC */
1260 struct sk_buff *skb;
1262 struct scm_cookie tmp_scm;
1264 if (NULL == siocb->scm)
1265 siocb->scm = &tmp_scm;
1266 err = scm_send(sock, msg, siocb->scm);
1271 if (msg->msg_flags&MSG_OOB)
1274 if (msg->msg_namelen) {
1275 err = unix_mkname(sunaddr, msg->msg_namelen, &hash);
1282 other = unix_peer_get(sk);
1287 if (test_bit(SOCK_PASSCRED, &sock->flags)
1288 && !u->addr && (err = unix_autobind(sock)) != 0)
1292 if (len > sk->sk_sndbuf - 32)
1295 skb = sock_alloc_send_skb(sk, len, msg->msg_flags&MSG_DONTWAIT, &err);
1299 memcpy(UNIXCREDS(skb), &siocb->scm->creds, sizeof(struct ucred));
1301 unix_attach_fds(siocb->scm, skb);
1303 skb->h.raw = skb->data;
1304 err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
1308 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1313 if (sunaddr == NULL)
1316 other = unix_find_other(sunaddr, namelen, sk->sk_type,
1322 unix_state_rlock(other);
1324 if (!unix_may_send(sk, other))
1327 if (sock_flag(other, SOCK_DEAD)) {
1329 * Check with 1003.1g - what should
1332 unix_state_runlock(other);
1336 unix_state_wlock(sk);
1337 if (unix_peer(sk) == other) {
1339 unix_state_wunlock(sk);
1341 unix_dgram_disconnected(sk, other);
1343 err = -ECONNREFUSED;
1345 unix_state_wunlock(sk);
1355 if (other->sk_shutdown & RCV_SHUTDOWN)
1358 if (sk->sk_type != SOCK_SEQPACKET) {
1359 err = security_unix_may_send(sk->sk_socket, other->sk_socket);
1364 if (unix_peer(other) != sk &&
1365 (skb_queue_len(&other->sk_receive_queue) >
1366 other->sk_max_ack_backlog)) {
1372 timeo = unix_wait_for_peer(other, timeo);
1374 err = sock_intr_errno(timeo);
1375 if (signal_pending(current))
1381 skb_queue_tail(&other->sk_receive_queue, skb);
1382 unix_state_runlock(other);
1383 other->sk_data_ready(other, len);
1385 scm_destroy(siocb->scm);
1389 unix_state_runlock(other);
1395 scm_destroy(siocb->scm);
1400 static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
1401 struct msghdr *msg, size_t len)
1403 struct sock_iocb *siocb = kiocb_to_siocb(kiocb);
1404 struct sock *sk = sock->sk;
1405 struct sock *other = NULL;
1406 struct sockaddr_un *sunaddr=msg->msg_name;
1408 struct sk_buff *skb;
1410 struct scm_cookie tmp_scm;
1412 if (NULL == siocb->scm)
1413 siocb->scm = &tmp_scm;
1414 err = scm_send(sock, msg, siocb->scm);
1419 if (msg->msg_flags&MSG_OOB)
1422 if (msg->msg_namelen) {
1423 err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP;
1428 other = unix_peer_get(sk);
1433 if (sk->sk_shutdown & SEND_SHUTDOWN)
1439 * Optimisation for the fact that under 0.01% of X messages typically
1445 /* Keep two messages in the pipe so it schedules better */
1446 if (size > sk->sk_sndbuf / 2 - 64)
1447 size = sk->sk_sndbuf / 2 - 64;
1449 if (size > SKB_MAX_ALLOC)
1450 size = SKB_MAX_ALLOC;
1456 skb=sock_alloc_send_skb(sk,size,msg->msg_flags&MSG_DONTWAIT, &err);
1462 * If you pass two values to the sock_alloc_send_skb
1463 * it tries to grab the large buffer with GFP_NOFS
1464 * (which can fail easily), and if it fails grab the
1465 * fallback size buffer which is under a page and will
1468 size = min_t(int, size, skb_tailroom(skb));
1470 memcpy(UNIXCREDS(skb), &siocb->scm->creds, sizeof(struct ucred));
1472 unix_attach_fds(siocb->scm, skb);
1474 if ((err = memcpy_fromiovec(skb_put(skb,size), msg->msg_iov, size)) != 0) {
1479 unix_state_rlock(other);
1481 if (sock_flag(other, SOCK_DEAD) ||
1482 (other->sk_shutdown & RCV_SHUTDOWN))
1485 skb_queue_tail(&other->sk_receive_queue, skb);
1486 unix_state_runlock(other);
1487 other->sk_data_ready(other, size);
1492 scm_destroy(siocb->scm);
1498 unix_state_runlock(other);
1501 if (sent==0 && !(msg->msg_flags&MSG_NOSIGNAL))
1502 send_sig(SIGPIPE,current,0);
1507 scm_destroy(siocb->scm);
1509 return sent ? : err;
1512 static int unix_seqpacket_sendmsg(struct kiocb *kiocb, struct socket *sock,
1513 struct msghdr *msg, size_t len)
1516 struct sock *sk = sock->sk;
1518 err = sock_error(sk);
1522 if (sk->sk_state != TCP_ESTABLISHED)
1525 if (msg->msg_namelen)
1526 msg->msg_namelen = 0;
1528 return unix_dgram_sendmsg(kiocb, sock, msg, len);
1531 static void unix_copy_addr(struct msghdr *msg, struct sock *sk)
1533 struct unix_sock *u = unix_sk(sk);
1535 msg->msg_namelen = 0;
1537 msg->msg_namelen = u->addr->len;
1538 memcpy(msg->msg_name, u->addr->name, u->addr->len);
1542 static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock,
1543 struct msghdr *msg, size_t size,
1546 struct sock_iocb *siocb = kiocb_to_siocb(iocb);
1547 struct scm_cookie tmp_scm;
1548 struct sock *sk = sock->sk;
1549 struct unix_sock *u = unix_sk(sk);
1550 int noblock = flags & MSG_DONTWAIT;
1551 struct sk_buff *skb;
1558 msg->msg_namelen = 0;
1562 skb = skb_recv_datagram(sk, flags, noblock, &err);
1566 wake_up_interruptible(&u->peer_wait);
1569 unix_copy_addr(msg, skb->sk);
1571 if (size > skb->len)
1573 else if (size < skb->len)
1574 msg->msg_flags |= MSG_TRUNC;
1576 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, size);
1581 siocb->scm = &tmp_scm;
1582 memset(&tmp_scm, 0, sizeof(tmp_scm));
1584 siocb->scm->creds = *UNIXCREDS(skb);
1586 if (!(flags & MSG_PEEK))
1589 unix_detach_fds(siocb->scm, skb);
1593 /* It is questionable: on PEEK we could:
1594 - do not return fds - good, but too simple 8)
1595 - return fds, and do not return them on read (old strategy,
1597 - clone fds (I chose it for now, it is the most universal
1600 POSIX 1003.1g does not actually define this clearly
1601 at all. POSIX 1003.1g doesn't define a lot of things
1606 siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp);
1610 scm_recv(sock, msg, siocb->scm, flags);
1613 skb_free_datagram(sk,skb);
1621 * Sleep until data has arrive. But check for races..
1624 static long unix_stream_data_wait(struct sock * sk, long timeo)
1628 unix_state_rlock(sk);
1631 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1633 if (skb_queue_len(&sk->sk_receive_queue) ||
1635 (sk->sk_shutdown & RCV_SHUTDOWN) ||
1636 signal_pending(current) ||
1640 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1641 unix_state_runlock(sk);
1642 timeo = schedule_timeout(timeo);
1643 unix_state_rlock(sk);
1644 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1647 finish_wait(sk->sk_sleep, &wait);
1648 unix_state_runlock(sk);
1654 static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
1655 struct msghdr *msg, size_t size,
1658 struct sock_iocb *siocb = kiocb_to_siocb(iocb);
1659 struct scm_cookie tmp_scm;
1660 struct sock *sk = sock->sk;
1661 struct unix_sock *u = unix_sk(sk);
1662 struct sockaddr_un *sunaddr=msg->msg_name;
1664 int check_creds = 0;
1670 if (sk->sk_state != TCP_ESTABLISHED)
1677 target = sock_rcvlowat(sk, flags&MSG_WAITALL, size);
1678 timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT);
1680 msg->msg_namelen = 0;
1682 /* Lock the socket to prevent queue disordering
1683 * while sleeps in memcpy_tomsg
1687 siocb->scm = &tmp_scm;
1688 memset(&tmp_scm, 0, sizeof(tmp_scm));
1696 struct sk_buff *skb;
1698 skb = skb_dequeue(&sk->sk_receive_queue);
1701 if (copied >= target)
1705 * POSIX 1003.1g mandates this order.
1708 if ((err = sock_error(sk)) != 0)
1710 if (sk->sk_shutdown & RCV_SHUTDOWN)
1717 timeo = unix_stream_data_wait(sk, timeo);
1719 if (signal_pending(current)) {
1720 err = sock_intr_errno(timeo);
1728 /* Never glue messages from different writers */
1729 if (memcmp(UNIXCREDS(skb), &siocb->scm->creds, sizeof(siocb->scm->creds)) != 0) {
1730 skb_queue_head(&sk->sk_receive_queue, skb);
1734 /* Copy credentials */
1735 siocb->scm->creds = *UNIXCREDS(skb);
1739 /* Copy address just once */
1742 unix_copy_addr(msg, skb->sk);
1746 chunk = min_t(unsigned int, skb->len, size);
1747 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1748 skb_queue_head(&sk->sk_receive_queue, skb);
1756 /* Mark read part of skb as used */
1757 if (!(flags & MSG_PEEK))
1759 skb_pull(skb, chunk);
1762 unix_detach_fds(siocb->scm, skb);
1764 /* put the skb back if we didn't use it up.. */
1767 skb_queue_head(&sk->sk_receive_queue, skb);
1778 /* It is questionable, see note in unix_dgram_recvmsg.
1781 siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp);
1783 /* put message back and return */
1784 skb_queue_head(&sk->sk_receive_queue, skb);
1790 scm_recv(sock, msg, siocb->scm, flags);
1792 return copied ? : err;
1795 static int unix_shutdown(struct socket *sock, int mode)
1797 struct sock *sk = sock->sk;
1800 mode = (mode+1)&(RCV_SHUTDOWN|SEND_SHUTDOWN);
1803 unix_state_wlock(sk);
1804 sk->sk_shutdown |= mode;
1805 other=unix_peer(sk);
1808 unix_state_wunlock(sk);
1809 sk->sk_state_change(sk);
1812 (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)) {
1816 if (mode&RCV_SHUTDOWN)
1817 peer_mode |= SEND_SHUTDOWN;
1818 if (mode&SEND_SHUTDOWN)
1819 peer_mode |= RCV_SHUTDOWN;
1820 unix_state_wlock(other);
1821 other->sk_shutdown |= peer_mode;
1822 unix_state_wunlock(other);
1823 other->sk_state_change(other);
1824 read_lock(&other->sk_callback_lock);
1825 if (peer_mode == SHUTDOWN_MASK)
1826 sk_wake_async(other,1,POLL_HUP);
1827 else if (peer_mode & RCV_SHUTDOWN)
1828 sk_wake_async(other,1,POLL_IN);
1829 read_unlock(&other->sk_callback_lock);
1837 static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1839 struct sock *sk = sock->sk;
1846 amount = atomic_read(&sk->sk_wmem_alloc);
1847 err = put_user(amount, (int __user *)arg);
1851 struct sk_buff *skb;
1853 if (sk->sk_state == TCP_LISTEN) {
1858 spin_lock(&sk->sk_receive_queue.lock);
1859 if (sk->sk_type == SOCK_STREAM ||
1860 sk->sk_type == SOCK_SEQPACKET) {
1861 skb_queue_walk(&sk->sk_receive_queue, skb)
1864 skb = skb_peek(&sk->sk_receive_queue);
1868 spin_unlock(&sk->sk_receive_queue.lock);
1869 err = put_user(amount, (int __user *)arg);
1874 err = dev_ioctl(cmd, (void __user *)arg);
1880 static unsigned int unix_poll(struct file * file, struct socket *sock, poll_table *wait)
1882 struct sock *sk = sock->sk;
1885 poll_wait(file, sk->sk_sleep, wait);
1888 /* exceptional events? */
1891 if (sk->sk_shutdown == SHUTDOWN_MASK)
1895 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1896 (sk->sk_shutdown & RCV_SHUTDOWN))
1897 mask |= POLLIN | POLLRDNORM;
1899 /* Connection-based need to check for termination and startup */
1900 if ((sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) && sk->sk_state == TCP_CLOSE)
1904 * we set writable also when the other side has shut down the
1905 * connection. This prevents stuck sockets.
1907 if (unix_writable(sk))
1908 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1914 #ifdef CONFIG_PROC_FS
1915 static struct sock *unix_seq_idx(int *iter, loff_t pos)
1920 for (s = first_unix_socket(iter); s; s = next_unix_socket(iter, s)) {
1929 static void *unix_seq_start(struct seq_file *seq, loff_t *pos)
1931 read_lock(&unix_table_lock);
1932 return *pos ? unix_seq_idx(seq->private, *pos - 1) : ((void *) 1);
1935 static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1940 return first_unix_socket(seq->private);
1941 return next_unix_socket(seq->private, v);
1944 static void unix_seq_stop(struct seq_file *seq, void *v)
1946 read_unlock(&unix_table_lock);
1949 static int unix_seq_show(struct seq_file *seq, void *v)
1953 seq_puts(seq, "Num RefCount Protocol Flags Type St "
1957 struct unix_sock *u = unix_sk(s);
1958 unix_state_rlock(s);
1960 seq_printf(seq, "%p: %08X %08X %08X %04X %02X %5lu",
1962 atomic_read(&s->sk_refcnt),
1964 s->sk_state == TCP_LISTEN ? __SO_ACCEPTCON : 0,
1967 (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTED : SS_UNCONNECTED) :
1968 (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTING : SS_DISCONNECTING),
1976 len = u->addr->len - sizeof(short);
1977 if (!UNIX_ABSTRACT(s))
1983 for ( ; i < len; i++)
1984 seq_putc(seq, u->addr->name->sun_path[i]);
1986 unix_state_runlock(s);
1987 seq_putc(seq, '\n');
1993 static struct seq_operations unix_seq_ops = {
1994 .start = unix_seq_start,
1995 .next = unix_seq_next,
1996 .stop = unix_seq_stop,
1997 .show = unix_seq_show,
2001 static int unix_seq_open(struct inode *inode, struct file *file)
2003 struct seq_file *seq;
2005 int *iter = kmalloc(sizeof(int), GFP_KERNEL);
2010 rc = seq_open(file, &unix_seq_ops);
2014 seq = file->private_data;
2015 seq->private = iter;
2024 static struct file_operations unix_seq_fops = {
2025 .owner = THIS_MODULE,
2026 .open = unix_seq_open,
2028 .llseek = seq_lseek,
2029 .release = seq_release_private,
2034 static struct net_proto_family unix_family_ops = {
2036 .create = unix_create,
2037 .owner = THIS_MODULE,
2040 #ifdef CONFIG_SYSCTL
2041 extern void unix_sysctl_register(void);
2042 extern void unix_sysctl_unregister(void);
2044 static inline void unix_sysctl_register(void) {}
2045 static inline void unix_sysctl_unregister(void) {}
2048 static int __init af_unix_init(void)
2051 struct sk_buff *dummy_skb;
2053 if (sizeof(struct unix_skb_parms) > sizeof(dummy_skb->cb)) {
2054 printk(KERN_CRIT "%s: panic\n", __FUNCTION__);
2058 rc = proto_register(&unix_proto, 1);
2060 printk(KERN_CRIT "%s: Cannot create unix_sock SLAB cache!\n",
2065 sock_register(&unix_family_ops);
2066 #ifdef CONFIG_PROC_FS
2067 proc_net_fops_create("unix", 0, &unix_seq_fops);
2069 unix_sysctl_register();
2074 static void __exit af_unix_exit(void)
2076 sock_unregister(PF_UNIX);
2077 unix_sysctl_unregister();
2078 proc_net_remove("unix");
2079 proto_unregister(&unix_proto);
2082 module_init(af_unix_init);
2083 module_exit(af_unix_exit);
2085 MODULE_LICENSE("GPL");
2086 MODULE_ALIAS_NETPROTO(PF_UNIX);