2 * NET4: Implementation of BSD Unix domain sockets.
4 * Authors: Alan Cox, <alan@lxorguk.ukuu.org.uk>
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.
12 * Linus Torvalds : Assorted bug cures.
13 * Niibe Yutaka : async I/O support.
14 * Carsten Paeth : PF_UNIX check, address fixes.
15 * Alan Cox : Limit size of allocated blocks.
16 * Alan Cox : Fixed the stupid socketpair bug.
17 * Alan Cox : BSD compatibility fine tuning.
18 * Alan Cox : Fixed a bug in connect when interrupted.
19 * Alan Cox : Sorted out a proper draft version of
20 * file descriptor passing hacked up from
22 * Marty Leisner : Fixes to fd passing
23 * Nick Nevin : recvmsg bugfix.
24 * Alan Cox : Started proper garbage collector
25 * Heiko EiBfeldt : Missing verify_area check
26 * Alan Cox : Started POSIXisms
27 * Andreas Schwab : Replace inode by dentry for proper
29 * Kirk Petersen : Made this a module
30 * Christoph Rohland : Elegant non-blocking accept/connect algorithm.
32 * Alexey Kuznetosv : Repaired (I hope) bugs introduces
33 * by above two patches.
34 * Andrea Arcangeli : If possible we block in connect(2)
35 * if the max backlog of the listen socket
36 * is been reached. This won't break
37 * old apps and it will avoid huge amount
38 * of socks hashed (this for unix_gc()
39 * performances reasons).
40 * Security fix that limits the max
41 * number of socks to 2*max_files and
42 * the number of skb queueable in the
44 * Artur Skawina : Hash function optimizations
45 * Alexey Kuznetsov : Full scale SMP. Lot of bugs are introduced 8)
46 * Malcolm Beattie : Set peercred for socketpair
47 * Michal Ostrowski : Module initialization cleanup.
48 * Arnaldo C. Melo : Remove MOD_{INC,DEC}_USE_COUNT,
49 * the core infrastructure is doing that
50 * for all net proto families now (2.5.69+)
53 * Known differences from reference BSD that was tested:
56 * ECONNREFUSED is not returned from one end of a connected() socket to the
57 * other the moment one end closes.
58 * fstat() doesn't return st_dev=0, and give the blksize as high water mark
59 * and a fake inode identifier (nor the BSD first socket fstat twice bug).
61 * accept() returns a path name even if the connecting socket has closed
62 * in the meantime (BSD loses the path and gives up).
63 * accept() returns 0 length path for an unbound connector. BSD returns 16
64 * and a null first byte in the path (but not for gethost/peername - BSD bug ??)
65 * socketpair(...SOCK_RAW..) doesn't panic the kernel.
66 * BSD af_unix apparently has connect forgetting to block properly.
67 * (need to check this with the POSIX spec in detail)
69 * Differences from 2.0.0-11-... (ANK)
70 * Bug fixes and improvements.
71 * - client shutdown killed server socket.
72 * - removed all useless cli/sti pairs.
74 * Semantic changes/extensions.
75 * - generic control message passing.
76 * - SCM_CREDENTIALS control message.
77 * - "Abstract" (not FS based) socket bindings.
78 * Abstract names are sequences of bytes (not zero terminated)
79 * started by 0, so that this name space does not intersect
83 #include <linux/module.h>
84 #include <linux/kernel.h>
85 #include <linux/signal.h>
86 #include <linux/sched.h>
87 #include <linux/errno.h>
88 #include <linux/string.h>
89 #include <linux/stat.h>
90 #include <linux/dcache.h>
91 #include <linux/namei.h>
92 #include <linux/socket.h>
94 #include <linux/fcntl.h>
95 #include <linux/termios.h>
96 #include <linux/sockios.h>
97 #include <linux/net.h>
100 #include <linux/slab.h>
101 #include <asm/uaccess.h>
102 #include <linux/skbuff.h>
103 #include <linux/netdevice.h>
104 #include <net/net_namespace.h>
105 #include <net/sock.h>
106 #include <net/tcp_states.h>
107 #include <net/af_unix.h>
108 #include <linux/proc_fs.h>
109 #include <linux/seq_file.h>
111 #include <linux/init.h>
112 #include <linux/poll.h>
113 #include <linux/rtnetlink.h>
114 #include <linux/mount.h>
115 #include <net/checksum.h>
116 #include <linux/security.h>
117 #include <linux/freezer.h>
120 #include <linux/uio.h>
121 #include <linux/blkdev.h>
122 #include <linux/compat.h>
123 #include <linux/rtc.h>
124 #include <asm/kmap_types.h>
125 #include <linux/device.h>
128 struct hlist_head unix_socket_table
[2 * UNIX_HASH_SIZE
];
129 EXPORT_SYMBOL_GPL(unix_socket_table
);
130 DEFINE_SPINLOCK(unix_table_lock
);
131 EXPORT_SYMBOL_GPL(unix_table_lock
);
132 static atomic_long_t unix_nr_socks
;
135 static struct hlist_head
*unix_sockets_unbound(void *addr
)
137 unsigned long hash
= (unsigned long)addr
;
141 hash
%= UNIX_HASH_SIZE
;
142 return &unix_socket_table
[UNIX_HASH_SIZE
+ hash
];
145 #define UNIX_ABSTRACT(sk) (unix_sk(sk)->addr->hash < UNIX_HASH_SIZE)
148 //for aee interface start
149 #define __UNIX_SOCKET_OUTPUT_BUF_SIZE__ 3500
150 static struct proc_dir_entry
*gunix_socket_track_aee_entry
= NULL
;
151 #define UNIX_SOCK_TRACK_AEE_PROCNAME "driver/usktrk_aee"
152 #define UNIX_SOCK_TRACK_PROC_AEE_SIZE 3072
154 static volatile unsigned int unix_sock_track_stop_flag
= 0;
155 #define unix_peer(sk) (unix_sk(sk)->peer)
158 #ifdef CONFIG_SECURITY_NETWORK
159 static void unix_get_secdata(struct scm_cookie
*scm
, struct sk_buff
*skb
)
161 memcpy(UNIXSID(skb
), &scm
->secid
, sizeof(u32
));
164 static inline void unix_set_secdata(struct scm_cookie
*scm
, struct sk_buff
*skb
)
166 scm
->secid
= *UNIXSID(skb
);
169 static inline void unix_get_secdata(struct scm_cookie
*scm
, struct sk_buff
*skb
)
172 static inline void unix_set_secdata(struct scm_cookie
*scm
, struct sk_buff
*skb
)
174 #endif /* CONFIG_SECURITY_NETWORK */
177 * SMP locking strategy:
178 * hash table is protected with spinlock unix_table_lock
179 * each socket state is protected by separate spin lock.
182 static inline unsigned int unix_hash_fold(__wsum n
)
184 unsigned int hash
= (__force
unsigned int)csum_fold(n
);
187 return hash
&(UNIX_HASH_SIZE
-1);
192 static inline int unix_our_peer(struct sock
*sk
, struct sock
*osk
)
194 return unix_peer(osk
) == sk
;
197 static inline int unix_may_send(struct sock
*sk
, struct sock
*osk
)
199 return unix_peer(osk
) == NULL
|| unix_our_peer(sk
, osk
);
202 static inline int unix_recvq_full(struct sock
const *sk
)
204 return skb_queue_len(&sk
->sk_receive_queue
) > sk
->sk_max_ack_backlog
;
207 struct sock
*unix_peer_get(struct sock
*s
)
215 unix_state_unlock(s
);
218 EXPORT_SYMBOL_GPL(unix_peer_get
);
220 static inline void unix_release_addr(struct unix_address
*addr
)
222 if (atomic_dec_and_test(&addr
->refcnt
))
227 * Check unix socket name:
228 * - should be not zero length.
229 * - if started by not zero, should be NULL terminated (FS object)
230 * - if started by zero, it is abstract name.
233 static int unix_mkname(struct sockaddr_un
*sunaddr
, int len
, unsigned int *hashp
)
235 if (len
<= sizeof(short) || len
> sizeof(*sunaddr
))
237 if (!sunaddr
|| sunaddr
->sun_family
!= AF_UNIX
)
239 if (sunaddr
->sun_path
[0]) {
241 * This may look like an off by one error but it is a bit more
242 * subtle. 108 is the longest valid AF_UNIX path for a binding.
243 * sun_path[108] doesn't as such exist. However in kernel space
244 * we are guaranteed that it is a valid memory location in our
245 * kernel address buffer.
247 ((char *)sunaddr
)[len
] = 0;
248 len
= strlen(sunaddr
->sun_path
)+1+sizeof(short);
252 *hashp
= unix_hash_fold(csum_partial(sunaddr
, len
, 0));
256 static void __unix_remove_socket(struct sock
*sk
)
258 sk_del_node_init(sk
);
261 static void __unix_insert_socket(struct hlist_head
*list
, struct sock
*sk
)
263 WARN_ON(!sk_unhashed(sk
));
264 sk_add_node(sk
, list
);
267 static inline void unix_remove_socket(struct sock
*sk
)
269 spin_lock(&unix_table_lock
);
270 __unix_remove_socket(sk
);
271 spin_unlock(&unix_table_lock
);
274 static inline void unix_insert_socket(struct hlist_head
*list
, struct sock
*sk
)
276 spin_lock(&unix_table_lock
);
277 __unix_insert_socket(list
, sk
);
278 spin_unlock(&unix_table_lock
);
281 static struct sock
*__unix_find_socket_byname(struct net
*net
,
282 struct sockaddr_un
*sunname
,
283 int len
, int type
, unsigned int hash
)
287 sk_for_each(s
, &unix_socket_table
[hash
^ type
]) {
288 struct unix_sock
*u
= unix_sk(s
);
290 if (!net_eq(sock_net(s
), net
))
293 if (u
->addr
->len
== len
&&
294 !memcmp(u
->addr
->name
, sunname
, len
))
302 static inline struct sock
*unix_find_socket_byname(struct net
*net
,
303 struct sockaddr_un
*sunname
,
309 spin_lock(&unix_table_lock
);
310 s
= __unix_find_socket_byname(net
, sunname
, len
, type
, hash
);
313 spin_unlock(&unix_table_lock
);
317 static struct sock
*unix_find_socket_byinode(struct inode
*i
)
321 spin_lock(&unix_table_lock
);
323 &unix_socket_table
[i
->i_ino
& (UNIX_HASH_SIZE
- 1)]) {
324 struct dentry
*dentry
= unix_sk(s
)->path
.dentry
;
326 if (dentry
&& dentry
->d_inode
== i
) {
333 spin_unlock(&unix_table_lock
);
337 /* Support code for asymmetrically connected dgram sockets
339 * If a datagram socket is connected to a socket not itself connected
340 * to the first socket (eg, /dev/log), clients may only enqueue more
341 * messages if the present receive queue of the server socket is not
342 * "too large". This means there's a second writeability condition
343 * poll and sendmsg need to test. The dgram recv code will do a wake
344 * up on the peer_wait wait queue of a socket upon reception of a
345 * datagram which needs to be propagated to sleeping would-be writers
346 * since these might not have sent anything so far. This can't be
347 * accomplished via poll_wait because the lifetime of the server
348 * socket might be less than that of its clients if these break their
349 * association with it or if the server socket is closed while clients
350 * are still connected to it and there's no way to inform "a polling
351 * implementation" that it should let go of a certain wait queue
353 * In order to propagate a wake up, a wait_queue_t of the client
354 * socket is enqueued on the peer_wait queue of the server socket
355 * whose wake function does a wake_up on the ordinary client socket
356 * wait queue. This connection is established whenever a write (or
357 * poll for write) hit the flow control condition and broken when the
358 * association to the server socket is dissolved or after a wake up
362 static int unix_dgram_peer_wake_relay(wait_queue_t
*q
, unsigned mode
, int flags
,
366 wait_queue_head_t
*u_sleep
;
368 u
= container_of(q
, struct unix_sock
, peer_wake
);
370 __remove_wait_queue(&unix_sk(u
->peer_wake
.private)->peer_wait
,
372 u
->peer_wake
.private = NULL
;
374 /* relaying can only happen while the wq still exists */
375 u_sleep
= sk_sleep(&u
->sk
);
377 wake_up_interruptible_poll(u_sleep
, key
);
382 static int unix_dgram_peer_wake_connect(struct sock
*sk
, struct sock
*other
)
384 struct unix_sock
*u
, *u_other
;
388 u_other
= unix_sk(other
);
390 spin_lock(&u_other
->peer_wait
.lock
);
392 if (!u
->peer_wake
.private) {
393 u
->peer_wake
.private = other
;
394 __add_wait_queue(&u_other
->peer_wait
, &u
->peer_wake
);
399 spin_unlock(&u_other
->peer_wait
.lock
);
403 static void unix_dgram_peer_wake_disconnect(struct sock
*sk
,
406 struct unix_sock
*u
, *u_other
;
409 u_other
= unix_sk(other
);
410 spin_lock(&u_other
->peer_wait
.lock
);
412 if (u
->peer_wake
.private == other
) {
413 __remove_wait_queue(&u_other
->peer_wait
, &u
->peer_wake
);
414 u
->peer_wake
.private = NULL
;
417 spin_unlock(&u_other
->peer_wait
.lock
);
420 static void unix_dgram_peer_wake_disconnect_wakeup(struct sock
*sk
,
423 unix_dgram_peer_wake_disconnect(sk
, other
);
424 wake_up_interruptible_poll(sk_sleep(sk
),
431 * - unix_peer(sk) == other
432 * - association is stable
434 static int unix_dgram_peer_wake_me(struct sock
*sk
, struct sock
*other
)
438 connected
= unix_dgram_peer_wake_connect(sk
, other
);
440 if (unix_recvq_full(other
))
444 unix_dgram_peer_wake_disconnect(sk
, other
);
449 static inline int unix_writable(struct sock
*sk
)
451 return (atomic_read(&sk
->sk_wmem_alloc
) << 2) <= sk
->sk_sndbuf
;
454 static void unix_write_space(struct sock
*sk
)
456 struct socket_wq
*wq
;
459 if (unix_writable(sk
)) {
460 wq
= rcu_dereference(sk
->sk_wq
);
461 if (wq_has_sleeper(wq
))
462 wake_up_interruptible_sync_poll(&wq
->wait
,
463 POLLOUT
| POLLWRNORM
| POLLWRBAND
);
464 sk_wake_async(sk
, SOCK_WAKE_SPACE
, POLL_OUT
);
469 /* When dgram socket disconnects (or changes its peer), we clear its receive
470 * queue of packets arrived from previous peer. First, it allows to do
471 * flow control based only on wmem_alloc; second, sk connected to peer
472 * may receive messages only from that peer. */
473 static void unix_dgram_disconnected(struct sock
*sk
, struct sock
*other
)
475 if (!skb_queue_empty(&sk
->sk_receive_queue
)) {
476 skb_queue_purge(&sk
->sk_receive_queue
);
477 wake_up_interruptible_all(&unix_sk(sk
)->peer_wait
);
479 /* If one link of bidirectional dgram pipe is disconnected,
480 * we signal error. Messages are lost. Do not make this,
481 * when peer was not connected to us.
483 if (!sock_flag(other
, SOCK_DEAD
) && unix_peer(other
) == sk
) {
484 other
->sk_err
= ECONNRESET
;
485 other
->sk_error_report(other
);
490 static void unix_sock_destructor(struct sock
*sk
)
492 struct unix_sock
*u
= unix_sk(sk
);
494 skb_queue_purge(&sk
->sk_receive_queue
);
496 WARN_ON(atomic_read(&sk
->sk_wmem_alloc
));
497 WARN_ON(!sk_unhashed(sk
));
498 WARN_ON(sk
->sk_socket
);
499 if (!sock_flag(sk
, SOCK_DEAD
)) {
500 #ifdef CONFIG_MTK_NET_LOGGING
501 printk(KERN_INFO
"[mtk_net][unix]Attempt to release alive unix socket: %p\n", sk
);
507 unix_release_addr(u
->addr
);
509 atomic_long_dec(&unix_nr_socks
);
511 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, -1);
513 #ifdef UNIX_REFCNT_DEBUG
514 printk(KERN_DEBUG
"[mtk_net][unix]UNIX %p is destroyed, %ld are still alive.\n", sk
,
515 atomic_long_read(&unix_nr_socks
));
519 static void unix_release_sock(struct sock
*sk
, int embrion
)
521 struct unix_sock
*u
= unix_sk(sk
);
527 unix_remove_socket(sk
);
532 sk
->sk_shutdown
= SHUTDOWN_MASK
;
534 u
->path
.dentry
= NULL
;
536 state
= sk
->sk_state
;
537 sk
->sk_state
= TCP_CLOSE
;
538 unix_state_unlock(sk
);
540 wake_up_interruptible_all(&u
->peer_wait
);
542 skpair
= unix_peer(sk
);
544 if (skpair
!= NULL
) {
545 if (sk
->sk_type
== SOCK_STREAM
|| sk
->sk_type
== SOCK_SEQPACKET
) {
546 unix_state_lock(skpair
);
548 skpair
->sk_shutdown
= SHUTDOWN_MASK
;
549 if (!skb_queue_empty(&sk
->sk_receive_queue
) || embrion
)
550 skpair
->sk_err
= ECONNRESET
;
551 unix_state_unlock(skpair
);
552 skpair
->sk_state_change(skpair
);
553 sk_wake_async(skpair
, SOCK_WAKE_WAITD
, POLL_HUP
);
556 unix_dgram_peer_wake_disconnect(sk
, skpair
);
557 sock_put(skpair
); /* It may now die */
558 unix_peer(sk
) = NULL
;
561 /* Try to flush out this socket. Throw out buffers at least */
563 while ((skb
= skb_dequeue(&sk
->sk_receive_queue
)) != NULL
) {
564 if (state
== TCP_LISTEN
)
565 unix_release_sock(skb
->sk
, 1);
566 /* passed fds are erased in the kfree_skb hook */
575 /* ---- Socket is dead now and most probably destroyed ---- */
578 * Fixme: BSD difference: In BSD all sockets connected to us get
579 * ECONNRESET and we die on the spot. In Linux we behave
580 * like files and pipes do and wait for the last
583 * Can't we simply set sock->err?
585 * What the above comment does talk about? --ANK(980817)
588 if (unix_tot_inflight
)
589 unix_gc(); /* Garbage collect fds */
592 static void init_peercred(struct sock
*sk
)
594 put_pid(sk
->sk_peer_pid
);
595 if (sk
->sk_peer_cred
)
596 put_cred(sk
->sk_peer_cred
);
597 sk
->sk_peer_pid
= get_pid(task_tgid(current
));
598 sk
->sk_peer_cred
= get_current_cred();
601 static void copy_peercred(struct sock
*sk
, struct sock
*peersk
)
603 put_pid(sk
->sk_peer_pid
);
604 if (sk
->sk_peer_cred
)
605 put_cred(sk
->sk_peer_cred
);
606 sk
->sk_peer_pid
= get_pid(peersk
->sk_peer_pid
);
607 sk
->sk_peer_cred
= get_cred(peersk
->sk_peer_cred
);
610 static int unix_listen(struct socket
*sock
, int backlog
)
613 struct sock
*sk
= sock
->sk
;
614 struct unix_sock
*u
= unix_sk(sk
);
615 struct pid
*old_pid
= NULL
;
618 if (sock
->type
!= SOCK_STREAM
&& sock
->type
!= SOCK_SEQPACKET
)
619 goto out
; /* Only stream/seqpacket sockets accept */
622 goto out
; /* No listens on an unbound socket */
624 if (sk
->sk_state
!= TCP_CLOSE
&& sk
->sk_state
!= TCP_LISTEN
)
626 if (backlog
> sk
->sk_max_ack_backlog
)
627 wake_up_interruptible_all(&u
->peer_wait
);
628 sk
->sk_max_ack_backlog
= backlog
;
629 sk
->sk_state
= TCP_LISTEN
;
630 /* set credentials so connect can copy them */
635 unix_state_unlock(sk
);
642 static int unix_release(struct socket
*);
643 static int unix_bind(struct socket
*, struct sockaddr
*, int);
644 static int unix_stream_connect(struct socket
*, struct sockaddr
*,
645 int addr_len
, int flags
);
646 static int unix_socketpair(struct socket
*, struct socket
*);
647 static int unix_accept(struct socket
*, struct socket
*, int);
648 static int unix_getname(struct socket
*, struct sockaddr
*, int *, int);
649 static unsigned int unix_poll(struct file
*, struct socket
*, poll_table
*);
650 static unsigned int unix_dgram_poll(struct file
*, struct socket
*,
652 static int unix_ioctl(struct socket
*, unsigned int, unsigned long);
653 static int unix_shutdown(struct socket
*, int);
654 static int unix_stream_sendmsg(struct kiocb
*, struct socket
*,
655 struct msghdr
*, size_t);
656 static int unix_stream_recvmsg(struct kiocb
*, struct socket
*,
657 struct msghdr
*, size_t, int);
658 static int unix_dgram_sendmsg(struct kiocb
*, struct socket
*,
659 struct msghdr
*, size_t);
660 static int unix_dgram_recvmsg(struct kiocb
*, struct socket
*,
661 struct msghdr
*, size_t, int);
662 static int unix_dgram_connect(struct socket
*, struct sockaddr
*,
664 static int unix_seqpacket_sendmsg(struct kiocb
*, struct socket
*,
665 struct msghdr
*, size_t);
666 static int unix_seqpacket_recvmsg(struct kiocb
*, struct socket
*,
667 struct msghdr
*, size_t, int);
669 static int unix_set_peek_off(struct sock
*sk
, int val
)
671 struct unix_sock
*u
= unix_sk(sk
);
673 if (mutex_lock_interruptible(&u
->readlock
))
676 sk
->sk_peek_off
= val
;
677 mutex_unlock(&u
->readlock
);
683 static const struct proto_ops unix_stream_ops
= {
685 .owner
= THIS_MODULE
,
686 .release
= unix_release
,
688 .connect
= unix_stream_connect
,
689 .socketpair
= unix_socketpair
,
690 .accept
= unix_accept
,
691 .getname
= unix_getname
,
694 .listen
= unix_listen
,
695 .shutdown
= unix_shutdown
,
696 .setsockopt
= sock_no_setsockopt
,
697 .getsockopt
= sock_no_getsockopt
,
698 .sendmsg
= unix_stream_sendmsg
,
699 .recvmsg
= unix_stream_recvmsg
,
700 .mmap
= sock_no_mmap
,
701 .sendpage
= sock_no_sendpage
,
702 .set_peek_off
= unix_set_peek_off
,
705 static const struct proto_ops unix_dgram_ops
= {
707 .owner
= THIS_MODULE
,
708 .release
= unix_release
,
710 .connect
= unix_dgram_connect
,
711 .socketpair
= unix_socketpair
,
712 .accept
= sock_no_accept
,
713 .getname
= unix_getname
,
714 .poll
= unix_dgram_poll
,
716 .listen
= sock_no_listen
,
717 .shutdown
= unix_shutdown
,
718 .setsockopt
= sock_no_setsockopt
,
719 .getsockopt
= sock_no_getsockopt
,
720 .sendmsg
= unix_dgram_sendmsg
,
721 .recvmsg
= unix_dgram_recvmsg
,
722 .mmap
= sock_no_mmap
,
723 .sendpage
= sock_no_sendpage
,
724 .set_peek_off
= unix_set_peek_off
,
727 static const struct proto_ops unix_seqpacket_ops
= {
729 .owner
= THIS_MODULE
,
730 .release
= unix_release
,
732 .connect
= unix_stream_connect
,
733 .socketpair
= unix_socketpair
,
734 .accept
= unix_accept
,
735 .getname
= unix_getname
,
736 .poll
= unix_dgram_poll
,
738 .listen
= unix_listen
,
739 .shutdown
= unix_shutdown
,
740 .setsockopt
= sock_no_setsockopt
,
741 .getsockopt
= sock_no_getsockopt
,
742 .sendmsg
= unix_seqpacket_sendmsg
,
743 .recvmsg
= unix_seqpacket_recvmsg
,
744 .mmap
= sock_no_mmap
,
745 .sendpage
= sock_no_sendpage
,
746 .set_peek_off
= unix_set_peek_off
,
749 static struct proto unix_proto
= {
751 .owner
= THIS_MODULE
,
752 .obj_size
= sizeof(struct unix_sock
),
756 * AF_UNIX sockets do not interact with hardware, hence they
757 * dont trigger interrupts - so it's safe for them to have
758 * bh-unsafe locking for their sk_receive_queue.lock. Split off
759 * this special lock-class by reinitializing the spinlock key:
761 static struct lock_class_key af_unix_sk_receive_queue_lock_key
;
763 static struct sock
*unix_create1(struct net
*net
, struct socket
*sock
)
765 struct sock
*sk
= NULL
;
768 atomic_long_inc(&unix_nr_socks
);
769 if (atomic_long_read(&unix_nr_socks
) > 2 * get_max_files())
772 sk
= sk_alloc(net
, PF_UNIX
, GFP_KERNEL
, &unix_proto
);
776 sock_init_data(sock
, sk
);
777 lockdep_set_class(&sk
->sk_receive_queue
.lock
,
778 &af_unix_sk_receive_queue_lock_key
);
780 sk
->sk_write_space
= unix_write_space
;
781 sk
->sk_max_ack_backlog
= net
->unx
.sysctl_max_dgram_qlen
;
782 sk
->sk_destruct
= unix_sock_destructor
;
784 u
->path
.dentry
= NULL
;
786 spin_lock_init(&u
->lock
);
787 atomic_long_set(&u
->inflight
, 0);
788 INIT_LIST_HEAD(&u
->link
);
789 mutex_init(&u
->readlock
); /* single task reading lock */
790 init_waitqueue_head(&u
->peer_wait
);
791 init_waitqueue_func_entry(&u
->peer_wake
, unix_dgram_peer_wake_relay
);
792 unix_insert_socket(unix_sockets_unbound(sk
), sk
);
795 atomic_long_dec(&unix_nr_socks
);
798 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, 1);
804 static int unix_create(struct net
*net
, struct socket
*sock
, int protocol
,
807 if (protocol
&& protocol
!= PF_UNIX
)
808 return -EPROTONOSUPPORT
;
810 sock
->state
= SS_UNCONNECTED
;
812 switch (sock
->type
) {
814 sock
->ops
= &unix_stream_ops
;
817 * Believe it or not BSD has AF_UNIX, SOCK_RAW though
821 sock
->type
= SOCK_DGRAM
;
823 sock
->ops
= &unix_dgram_ops
;
826 sock
->ops
= &unix_seqpacket_ops
;
829 return -ESOCKTNOSUPPORT
;
832 return unix_create1(net
, sock
) ? 0 : -ENOMEM
;
835 static int unix_release(struct socket
*sock
)
837 struct sock
*sk
= sock
->sk
;
842 unix_release_sock(sk
, 0);
848 static int unix_autobind(struct socket
*sock
)
850 struct sock
*sk
= sock
->sk
;
851 struct net
*net
= sock_net(sk
);
852 struct unix_sock
*u
= unix_sk(sk
);
853 static u32 ordernum
= 1;
854 struct unix_address
*addr
;
856 unsigned int retries
= 0;
858 err
= mutex_lock_interruptible(&u
->readlock
);
867 addr
= kzalloc(sizeof(*addr
) + sizeof(short) + 16, GFP_KERNEL
);
871 addr
->name
->sun_family
= AF_UNIX
;
872 atomic_set(&addr
->refcnt
, 1);
875 addr
->len
= sprintf(addr
->name
->sun_path
+1, "%05x", ordernum
) + 1 + sizeof(short);
876 addr
->hash
= unix_hash_fold(csum_partial(addr
->name
, addr
->len
, 0));
878 spin_lock(&unix_table_lock
);
879 ordernum
= (ordernum
+1)&0xFFFFF;
881 if (__unix_find_socket_byname(net
, addr
->name
, addr
->len
, sock
->type
,
883 spin_unlock(&unix_table_lock
);
885 * __unix_find_socket_byname() may take long time if many names
886 * are already in use.
889 /* Give up if all names seems to be in use. */
890 if (retries
++ == 0xFFFFF) {
897 addr
->hash
^= sk
->sk_type
;
899 __unix_remove_socket(sk
);
901 __unix_insert_socket(&unix_socket_table
[addr
->hash
], sk
);
902 spin_unlock(&unix_table_lock
);
905 out
: mutex_unlock(&u
->readlock
);
909 static struct sock
*unix_find_other(struct net
*net
,
910 struct sockaddr_un
*sunname
, int len
,
911 int type
, unsigned int hash
, int *error
)
917 if (sunname
->sun_path
[0]) {
919 err
= kern_path(sunname
->sun_path
, LOOKUP_FOLLOW
, &path
);
922 inode
= path
.dentry
->d_inode
;
923 err
= inode_permission(inode
, MAY_WRITE
);
928 if (!S_ISSOCK(inode
->i_mode
))
930 u
= unix_find_socket_byinode(inode
);
934 if (u
->sk_type
== type
)
940 if (u
->sk_type
!= type
) {
946 u
= unix_find_socket_byname(net
, sunname
, len
, type
, hash
);
948 struct dentry
*dentry
;
949 dentry
= unix_sk(u
)->path
.dentry
;
951 touch_atime(&unix_sk(u
)->path
);
964 static int unix_mknod(const char *sun_path
, umode_t mode
, struct path
*res
)
966 struct dentry
*dentry
;
970 * Get the parent directory, calculate the hash for last
973 dentry
= kern_path_create(AT_FDCWD
, sun_path
, &path
, 0);
974 err
= PTR_ERR(dentry
);
979 * All right, let's create it.
981 err
= security_path_mknod(&path
, dentry
, mode
, 0);
983 err
= vfs_mknod(path
.dentry
->d_inode
, dentry
, mode
, 0);
985 res
->mnt
= mntget(path
.mnt
);
986 res
->dentry
= dget(dentry
);
989 done_path_create(&path
, dentry
);
993 static int unix_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
)
995 struct sock
*sk
= sock
->sk
;
996 struct net
*net
= sock_net(sk
);
997 struct unix_sock
*u
= unix_sk(sk
);
998 struct sockaddr_un
*sunaddr
= (struct sockaddr_un
*)uaddr
;
999 char *sun_path
= sunaddr
->sun_path
;
1002 struct unix_address
*addr
;
1003 struct hlist_head
*list
;
1006 if (sunaddr
->sun_family
!= AF_UNIX
)
1009 if (addr_len
== sizeof(short)) {
1010 err
= unix_autobind(sock
);
1014 err
= unix_mkname(sunaddr
, addr_len
, &hash
);
1019 err
= mutex_lock_interruptible(&u
->readlock
);
1028 addr
= kmalloc(sizeof(*addr
)+addr_len
, GFP_KERNEL
);
1032 memcpy(addr
->name
, sunaddr
, addr_len
);
1033 addr
->len
= addr_len
;
1034 addr
->hash
= hash
^ sk
->sk_type
;
1035 atomic_set(&addr
->refcnt
, 1);
1040 umode_t mode
= S_IFSOCK
|
1041 (SOCK_INODE(sock
)->i_mode
& ~current_umask());
1042 err
= unix_mknod(sun_path
, mode
, &path
);
1046 unix_release_addr(addr
);
1049 addr
->hash
= UNIX_HASH_SIZE
;
1050 hash
= path
.dentry
->d_inode
->i_ino
& (UNIX_HASH_SIZE
-1);
1051 spin_lock(&unix_table_lock
);
1053 list
= &unix_socket_table
[hash
];
1055 spin_lock(&unix_table_lock
);
1057 if (__unix_find_socket_byname(net
, sunaddr
, addr_len
,
1058 sk
->sk_type
, hash
)) {
1059 unix_release_addr(addr
);
1063 list
= &unix_socket_table
[addr
->hash
];
1067 __unix_remove_socket(sk
);
1069 __unix_insert_socket(list
, sk
);
1072 spin_unlock(&unix_table_lock
);
1074 mutex_unlock(&u
->readlock
);
1080 static void unix_state_double_lock(struct sock
*sk1
, struct sock
*sk2
)
1082 if (unlikely(sk1
== sk2
) || !sk2
) {
1083 unix_state_lock(sk1
);
1087 unix_state_lock(sk1
);
1088 unix_state_lock_nested(sk2
);
1090 unix_state_lock(sk2
);
1091 unix_state_lock_nested(sk1
);
1095 static void unix_state_double_unlock(struct sock
*sk1
, struct sock
*sk2
)
1097 if (unlikely(sk1
== sk2
) || !sk2
) {
1098 unix_state_unlock(sk1
);
1101 unix_state_unlock(sk1
);
1102 unix_state_unlock(sk2
);
1105 static int unix_dgram_connect(struct socket
*sock
, struct sockaddr
*addr
,
1106 int alen
, int flags
)
1108 struct sock
*sk
= sock
->sk
;
1109 struct net
*net
= sock_net(sk
);
1110 struct sockaddr_un
*sunaddr
= (struct sockaddr_un
*)addr
;
1115 if (addr
->sa_family
!= AF_UNSPEC
) {
1117 err
= unix_mkname(sunaddr
, alen
, &hash
);
1122 if (test_bit(SOCK_PASSCRED
, &sock
->flags
) &&
1123 !unix_sk(sk
)->addr
&& (err
= unix_autobind(sock
)) != 0)
1127 other
= unix_find_other(net
, sunaddr
, alen
, sock
->type
, hash
, &err
);
1131 unix_state_double_lock(sk
, other
);
1133 /* Apparently VFS overslept socket death. Retry. */
1134 if (sock_flag(other
, SOCK_DEAD
)) {
1135 unix_state_double_unlock(sk
, other
);
1141 if (!unix_may_send(sk
, other
))
1144 err
= security_unix_may_send(sk
->sk_socket
, other
->sk_socket
);
1150 * 1003.1g breaking connected state with AF_UNSPEC
1153 unix_state_double_lock(sk
, other
);
1157 * If it was connected, reconnect.
1159 if (unix_peer(sk
)) {
1160 struct sock
*old_peer
= unix_peer(sk
);
1161 unix_peer(sk
) = other
;
1162 unix_dgram_peer_wake_disconnect_wakeup(sk
, old_peer
);
1164 unix_state_double_unlock(sk
, other
);
1166 if (other
!= old_peer
)
1167 unix_dgram_disconnected(sk
, old_peer
);
1170 unix_peer(sk
) = other
;
1171 unix_state_double_unlock(sk
, other
);
1174 #ifdef CONFIG_MTK_NET_LOGGING
1175 if((SOCK_INODE(sock
)!= NULL
) && (sunaddr
!= NULL
) && (other
->sk_socket
!= NULL
) && (SOCK_INODE(other
->sk_socket
) != NULL
))
1177 printk(KERN_INFO
"[mtk_net][socket]unix_dgram_connect[%lu]:connect [%s] other[%lu]\n",SOCK_INODE(sock
)->i_ino
,sunaddr
->sun_path
,SOCK_INODE(other
->sk_socket
)->i_ino
);
1184 unix_state_double_unlock(sk
, other
);
1191 static long unix_wait_for_peer(struct sock
*other
, long timeo
)
1193 struct unix_sock
*u
= unix_sk(other
);
1197 prepare_to_wait_exclusive(&u
->peer_wait
, &wait
, TASK_INTERRUPTIBLE
);
1199 sched
= !sock_flag(other
, SOCK_DEAD
) &&
1200 !(other
->sk_shutdown
& RCV_SHUTDOWN
) &&
1201 unix_recvq_full(other
);
1203 unix_state_unlock(other
);
1206 timeo
= schedule_timeout(timeo
);
1208 finish_wait(&u
->peer_wait
, &wait
);
1212 static int unix_stream_connect(struct socket
*sock
, struct sockaddr
*uaddr
,
1213 int addr_len
, int flags
)
1215 struct sockaddr_un
*sunaddr
= (struct sockaddr_un
*)uaddr
;
1216 struct sock
*sk
= sock
->sk
;
1217 struct net
*net
= sock_net(sk
);
1218 struct unix_sock
*u
= unix_sk(sk
), *newu
, *otheru
;
1219 struct sock
*newsk
= NULL
;
1220 struct sock
*other
= NULL
;
1221 struct sk_buff
*skb
= NULL
;
1227 err
= unix_mkname(sunaddr
, addr_len
, &hash
);
1232 if (test_bit(SOCK_PASSCRED
, &sock
->flags
) && !u
->addr
&&
1233 (err
= unix_autobind(sock
)) != 0)
1236 timeo
= sock_sndtimeo(sk
, flags
& O_NONBLOCK
);
1238 /* First of all allocate resources.
1239 If we will make it after state is locked,
1240 we will have to recheck all again in any case.
1245 /* create new sock for complete connection */
1246 newsk
= unix_create1(sock_net(sk
), NULL
);
1250 /* Allocate skb for sending to listening sock */
1251 skb
= sock_wmalloc(newsk
, 1, 0, GFP_KERNEL
);
1256 /* Find listening sock. */
1257 other
= unix_find_other(net
, sunaddr
, addr_len
, sk
->sk_type
, hash
, &err
);
1261 /* Latch state of peer */
1262 unix_state_lock(other
);
1264 /* Apparently VFS overslept socket death. Retry. */
1265 if (sock_flag(other
, SOCK_DEAD
)) {
1266 unix_state_unlock(other
);
1271 err
= -ECONNREFUSED
;
1272 if (other
->sk_state
!= TCP_LISTEN
)
1274 if (other
->sk_shutdown
& RCV_SHUTDOWN
)
1277 if (unix_recvq_full(other
)) {
1282 timeo
= unix_wait_for_peer(other
, timeo
);
1284 err
= sock_intr_errno(timeo
);
1285 if (signal_pending(current
))
1293 It is tricky place. We need to grab our state lock and cannot
1294 drop lock on peer. It is dangerous because deadlock is
1295 possible. Connect to self case and simultaneous
1296 attempt to connect are eliminated by checking socket
1297 state. other is TCP_LISTEN, if sk is TCP_LISTEN we
1298 check this before attempt to grab lock.
1300 Well, and we have to recheck the state after socket locked.
1306 /* This is ok... continue with connect */
1308 case TCP_ESTABLISHED
:
1309 /* Socket is already connected */
1317 unix_state_lock_nested(sk
);
1319 if (sk
->sk_state
!= st
) {
1320 unix_state_unlock(sk
);
1321 unix_state_unlock(other
);
1326 err
= security_unix_stream_connect(sk
, other
, newsk
);
1328 unix_state_unlock(sk
);
1332 /* The way is open! Fastly set all the necessary fields... */
1335 unix_peer(newsk
) = sk
;
1336 newsk
->sk_state
= TCP_ESTABLISHED
;
1337 newsk
->sk_type
= sk
->sk_type
;
1338 init_peercred(newsk
);
1339 newu
= unix_sk(newsk
);
1340 RCU_INIT_POINTER(newsk
->sk_wq
, &newu
->peer_wq
);
1341 otheru
= unix_sk(other
);
1343 /* copy address information from listening to new sock*/
1345 atomic_inc(&otheru
->addr
->refcnt
);
1346 newu
->addr
= otheru
->addr
;
1348 if (otheru
->path
.dentry
) {
1349 path_get(&otheru
->path
);
1350 newu
->path
= otheru
->path
;
1353 /* Set credentials */
1354 copy_peercred(sk
, other
);
1356 sock
->state
= SS_CONNECTED
;
1357 sk
->sk_state
= TCP_ESTABLISHED
;
1360 smp_mb__after_atomic_inc(); /* sock_hold() does an atomic_inc() */
1361 unix_peer(sk
) = newsk
;
1363 unix_state_unlock(sk
);
1365 /* take ten and and send info to listening sock */
1366 spin_lock(&other
->sk_receive_queue
.lock
);
1367 __skb_queue_tail(&other
->sk_receive_queue
, skb
);
1368 spin_unlock(&other
->sk_receive_queue
.lock
);
1369 unix_state_unlock(other
);
1371 #ifdef CONFIG_MTK_NET_LOGGING
1372 if((SOCK_INODE(sock
)!= NULL
) && (sunaddr
!= NULL
) && (other
->sk_socket
!= NULL
) && (SOCK_INODE(other
->sk_socket
) != NULL
))
1374 printk(KERN_INFO
"[mtk_net][socket]unix_stream_connect[%lu ]: connect [%s] other[%lu] \n",SOCK_INODE(sock
)->i_ino
,sunaddr
->sun_path
,SOCK_INODE(other
->sk_socket
)->i_ino
);
1378 other
->sk_data_ready(other
, 0);
1385 unix_state_unlock(other
);
1390 unix_release_sock(newsk
, 0);
1397 static int unix_socketpair(struct socket
*socka
, struct socket
*sockb
)
1399 struct sock
*ska
= socka
->sk
, *skb
= sockb
->sk
;
1401 /* Join our sockets back to back */
1404 unix_peer(ska
) = skb
;
1405 unix_peer(skb
) = ska
;
1409 if (ska
->sk_type
!= SOCK_DGRAM
) {
1410 ska
->sk_state
= TCP_ESTABLISHED
;
1411 skb
->sk_state
= TCP_ESTABLISHED
;
1412 socka
->state
= SS_CONNECTED
;
1413 sockb
->state
= SS_CONNECTED
;
1418 static void unix_sock_inherit_flags(const struct socket
*old
,
1421 if (test_bit(SOCK_PASSCRED
, &old
->flags
))
1422 set_bit(SOCK_PASSCRED
, &new->flags
);
1423 if (test_bit(SOCK_PASSSEC
, &old
->flags
))
1424 set_bit(SOCK_PASSSEC
, &new->flags
);
1427 static int unix_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
1429 struct sock
*sk
= sock
->sk
;
1431 struct sk_buff
*skb
;
1435 if (sock
->type
!= SOCK_STREAM
&& sock
->type
!= SOCK_SEQPACKET
)
1439 if (sk
->sk_state
!= TCP_LISTEN
)
1442 /* If socket state is TCP_LISTEN it cannot change (for now...),
1443 * so that no locks are necessary.
1446 skb
= skb_recv_datagram(sk
, 0, flags
&O_NONBLOCK
, &err
);
1448 /* This means receive shutdown. */
1455 skb_free_datagram(sk
, skb
);
1456 wake_up_interruptible(&unix_sk(sk
)->peer_wait
);
1458 /* attach accepted sock to socket */
1459 unix_state_lock(tsk
);
1460 newsock
->state
= SS_CONNECTED
;
1461 unix_sock_inherit_flags(sock
, newsock
);
1462 sock_graft(tsk
, newsock
);
1463 unix_state_unlock(tsk
);
1473 static int unix_getname(struct socket
*sock
, struct sockaddr
*uaddr
, int *uaddr_len
, int peer
)
1475 struct sock
*sk
= sock
->sk
;
1476 struct unix_sock
*u
;
1477 DECLARE_SOCKADDR(struct sockaddr_un
*, sunaddr
, uaddr
);
1481 sk
= unix_peer_get(sk
);
1492 unix_state_lock(sk
);
1494 sunaddr
->sun_family
= AF_UNIX
;
1495 sunaddr
->sun_path
[0] = 0;
1496 *uaddr_len
= sizeof(short);
1498 struct unix_address
*addr
= u
->addr
;
1500 *uaddr_len
= addr
->len
;
1501 memcpy(sunaddr
, addr
->name
, *uaddr_len
);
1503 unix_state_unlock(sk
);
1509 static void unix_detach_fds(struct scm_cookie
*scm
, struct sk_buff
*skb
)
1513 scm
->fp
= UNIXCB(skb
).fp
;
1514 UNIXCB(skb
).fp
= NULL
;
1516 for (i
= scm
->fp
->count
-1; i
>= 0; i
--)
1517 unix_notinflight(scm
->fp
->fp
[i
]);
1520 static void unix_destruct_scm(struct sk_buff
*skb
)
1522 struct scm_cookie scm
;
1523 memset(&scm
, 0, sizeof(scm
));
1524 scm
.pid
= UNIXCB(skb
).pid
;
1526 unix_detach_fds(&scm
, skb
);
1528 /* Alas, it calls VFS */
1529 /* So fscking what? fput() had been SMP-safe since the last Summer */
1534 #define MAX_RECURSION_LEVEL 4
1536 static int unix_attach_fds(struct scm_cookie
*scm
, struct sk_buff
*skb
)
1539 unsigned char max_level
= 0;
1540 int unix_sock_count
= 0;
1542 for (i
= scm
->fp
->count
- 1; i
>= 0; i
--) {
1543 struct sock
*sk
= unix_get_socket(scm
->fp
->fp
[i
]);
1547 max_level
= max(max_level
,
1548 unix_sk(sk
)->recursion_level
);
1551 if (unlikely(max_level
> MAX_RECURSION_LEVEL
))
1552 return -ETOOMANYREFS
;
1555 * Need to duplicate file references for the sake of garbage
1556 * collection. Otherwise a socket in the fps might become a
1557 * candidate for GC while the skb is not yet queued.
1559 UNIXCB(skb
).fp
= scm_fp_dup(scm
->fp
);
1560 if (!UNIXCB(skb
).fp
)
1563 if (unix_sock_count
) {
1564 for (i
= scm
->fp
->count
- 1; i
>= 0; i
--)
1565 unix_inflight(scm
->fp
->fp
[i
]);
1570 static int unix_scm_to_skb(struct scm_cookie
*scm
, struct sk_buff
*skb
, bool send_fds
)
1574 UNIXCB(skb
).pid
= get_pid(scm
->pid
);
1575 UNIXCB(skb
).uid
= scm
->creds
.uid
;
1576 UNIXCB(skb
).gid
= scm
->creds
.gid
;
1577 UNIXCB(skb
).fp
= NULL
;
1578 if (scm
->fp
&& send_fds
)
1579 err
= unix_attach_fds(scm
, skb
);
1581 skb
->destructor
= unix_destruct_scm
;
1586 * Some apps rely on write() giving SCM_CREDENTIALS
1587 * We include credentials if source or destination socket
1588 * asserted SOCK_PASSCRED.
1590 static void maybe_add_creds(struct sk_buff
*skb
, const struct socket
*sock
,
1591 const struct sock
*other
)
1593 if (UNIXCB(skb
).pid
)
1595 if (test_bit(SOCK_PASSCRED
, &sock
->flags
) ||
1596 !other
->sk_socket
||
1597 test_bit(SOCK_PASSCRED
, &other
->sk_socket
->flags
)) {
1598 UNIXCB(skb
).pid
= get_pid(task_tgid(current
));
1599 current_uid_gid(&UNIXCB(skb
).uid
, &UNIXCB(skb
).gid
);
1604 * Send AF_UNIX data.
1607 static int unix_dgram_sendmsg(struct kiocb
*kiocb
, struct socket
*sock
,
1608 struct msghdr
*msg
, size_t len
)
1610 struct sock_iocb
*siocb
= kiocb_to_siocb(kiocb
);
1611 struct sock
*sk
= sock
->sk
;
1612 struct net
*net
= sock_net(sk
);
1613 struct unix_sock
*u
= unix_sk(sk
);
1614 struct sockaddr_un
*sunaddr
= msg
->msg_name
;
1615 struct sock
*other
= NULL
;
1616 int namelen
= 0; /* fake GCC */
1619 struct sk_buff
*skb
;
1621 struct scm_cookie tmp_scm
;
1626 if (NULL
== siocb
->scm
)
1627 siocb
->scm
= &tmp_scm
;
1629 err
= scm_send(sock
, msg
, siocb
->scm
, false);
1634 if (msg
->msg_flags
&MSG_OOB
)
1637 if (msg
->msg_namelen
) {
1638 err
= unix_mkname(sunaddr
, msg
->msg_namelen
, &hash
);
1645 other
= unix_peer_get(sk
);
1650 if (test_bit(SOCK_PASSCRED
, &sock
->flags
) && !u
->addr
1651 && (err
= unix_autobind(sock
)) != 0)
1655 if (len
> sk
->sk_sndbuf
- 32)
1658 if (len
> SKB_MAX_ALLOC
)
1659 data_len
= min_t(size_t,
1660 len
- SKB_MAX_ALLOC
,
1661 MAX_SKB_FRAGS
* PAGE_SIZE
);
1663 skb
= sock_alloc_send_pskb(sk
, len
- data_len
, data_len
,
1664 msg
->msg_flags
& MSG_DONTWAIT
, &err
);
1668 err
= unix_scm_to_skb(siocb
->scm
, skb
, true);
1671 max_level
= err
+ 1;
1672 unix_get_secdata(siocb
->scm
, skb
);
1674 skb_put(skb
, len
- data_len
);
1675 skb
->data_len
= data_len
;
1677 err
= skb_copy_datagram_from_iovec(skb
, 0, msg
->msg_iov
, 0, len
);
1681 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
1686 if (sunaddr
== NULL
)
1689 other
= unix_find_other(net
, sunaddr
, namelen
, sk
->sk_type
,
1695 if (sk_filter(other
, skb
) < 0) {
1696 /* Toss the packet but do not return any error to the sender */
1702 unix_state_lock(other
);
1705 if (!unix_may_send(sk
, other
))
1708 if (unlikely(sock_flag(other
, SOCK_DEAD
))) {
1710 * Check with 1003.1g - what should
1713 unix_state_unlock(other
);
1717 unix_state_lock(sk
);
1718 if (unix_peer(sk
) == other
) {
1719 unix_peer(sk
) = NULL
;
1720 unix_dgram_peer_wake_disconnect_wakeup(sk
, other
);
1722 unix_state_unlock(sk
);
1724 unix_dgram_disconnected(sk
, other
);
1726 err
= -ECONNREFUSED
;
1728 unix_state_unlock(sk
);
1738 if (other
->sk_shutdown
& RCV_SHUTDOWN
)
1741 if (sk
->sk_type
!= SOCK_SEQPACKET
) {
1742 err
= security_unix_may_send(sk
->sk_socket
, other
->sk_socket
);
1747 /* other == sk && unix_peer(other) != sk if
1748 * - unix_peer(sk) == NULL, destination address bound to sk
1749 * - unix_peer(sk) == sk by time of get but disconnected before lock
1752 unlikely(unix_peer(other
) != sk
&& unix_recvq_full(other
))) {
1754 timeo
= unix_wait_for_peer(other
, timeo
);
1756 err
= sock_intr_errno(timeo
);
1757 if (signal_pending(current
))
1764 unix_state_unlock(other
);
1765 unix_state_double_lock(sk
, other
);
1768 if (unix_peer(sk
) != other
||
1769 unix_dgram_peer_wake_me(sk
, other
)) {
1777 goto restart_locked
;
1781 if (unlikely(sk_locked
))
1782 unix_state_unlock(sk
);
1784 if (sock_flag(other
, SOCK_RCVTSTAMP
))
1785 __net_timestamp(skb
);
1786 maybe_add_creds(skb
, sock
, other
);
1787 skb_queue_tail(&other
->sk_receive_queue
, skb
);
1788 if (max_level
> unix_sk(other
)->recursion_level
)
1789 unix_sk(other
)->recursion_level
= max_level
;
1790 unix_state_unlock(other
);
1791 other
->sk_data_ready(other
, len
);
1793 scm_destroy(siocb
->scm
);
1799 unix_state_unlock(sk
);
1800 unix_state_unlock(other
);
1806 scm_destroy(siocb
->scm
);
1812 static int unix_stream_sendmsg(struct kiocb
*kiocb
, struct socket
*sock
,
1813 struct msghdr
*msg
, size_t len
)
1815 struct sock_iocb
*siocb
= kiocb_to_siocb(kiocb
);
1816 struct sock
*sk
= sock
->sk
;
1817 struct sock
*other
= NULL
;
1819 struct sk_buff
*skb
;
1821 struct scm_cookie tmp_scm
;
1822 bool fds_sent
= false;
1825 if (NULL
== siocb
->scm
)
1826 siocb
->scm
= &tmp_scm
;
1829 err
= scm_send(sock
, msg
, siocb
->scm
, false);
1834 if (msg
->msg_flags
&MSG_OOB
)
1837 if (msg
->msg_namelen
) {
1838 err
= sk
->sk_state
== TCP_ESTABLISHED
? -EISCONN
: -EOPNOTSUPP
;
1842 other
= unix_peer(sk
);
1847 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
1850 while (sent
< len
) {
1852 * Optimisation for the fact that under 0.01% of X
1853 * messages typically need breaking up.
1858 /* Keep two messages in the pipe so it schedules better */
1859 if (size
> ((sk
->sk_sndbuf
>> 1) - 64))
1860 size
= (sk
->sk_sndbuf
>> 1) - 64;
1862 if (size
> SKB_MAX_ALLOC
)
1863 size
= SKB_MAX_ALLOC
;
1869 skb
= sock_alloc_send_skb(sk
, size
, msg
->msg_flags
&MSG_DONTWAIT
,
1877 * If you pass two values to the sock_alloc_send_skb
1878 * it tries to grab the large buffer with GFP_NOFS
1879 * (which can fail easily), and if it fails grab the
1880 * fallback size buffer which is under a page and will
1883 size
= min_t(int, size
, skb_tailroom(skb
));
1886 /* Only send the fds in the first buffer */
1887 err
= unix_scm_to_skb(siocb
->scm
, skb
, !fds_sent
);
1892 max_level
= err
+ 1;
1895 err
= memcpy_fromiovec(skb_put(skb
, size
), msg
->msg_iov
, size
);
1901 unix_state_lock(other
);
1903 if (sock_flag(other
, SOCK_DEAD
) ||
1904 (other
->sk_shutdown
& RCV_SHUTDOWN
))
1906 if( other
->sk_socket
)
1911 #ifdef CONFIG_MTK_NET_LOGGING
1912 printk(KERN_INFO
" [mtk_net][unix]: sendmsg[%lu:%lu]:peer close\n" ,SOCK_INODE(sk
->sk_socket
)->i_ino
,SOCK_INODE(other
->sk_socket
)->i_ino
);
1916 #ifdef CONFIG_MTK_NET_LOGGING
1917 printk(KERN_INFO
" [mtk_net][unix]: sendmsg[null:%lu]:peer close\n" ,SOCK_INODE(other
->sk_socket
)->i_ino
);
1924 #ifdef CONFIG_MTK_NET_LOGGING
1925 printk(KERN_INFO
" [mtk_net][unix]: sendmsg:peer close \n" );
1933 maybe_add_creds(skb
, sock
, other
);
1934 skb_queue_tail(&other
->sk_receive_queue
, skb
);
1935 if (max_level
> unix_sk(other
)->recursion_level
)
1936 unix_sk(other
)->recursion_level
= max_level
;
1937 unix_state_unlock(other
);
1938 other
->sk_data_ready(other
, size
);
1942 scm_destroy(siocb
->scm
);
1948 unix_state_unlock(other
);
1951 if (sent
== 0 && !(msg
->msg_flags
&MSG_NOSIGNAL
))
1952 send_sig(SIGPIPE
, current
, 0);
1955 scm_destroy(siocb
->scm
);
1958 return sent
? : err
;
1961 static int unix_seqpacket_sendmsg(struct kiocb
*kiocb
, struct socket
*sock
,
1962 struct msghdr
*msg
, size_t len
)
1965 struct sock
*sk
= sock
->sk
;
1967 err
= sock_error(sk
);
1971 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1974 if (msg
->msg_namelen
)
1975 msg
->msg_namelen
= 0;
1977 return unix_dgram_sendmsg(kiocb
, sock
, msg
, len
);
1980 static int unix_seqpacket_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
1981 struct msghdr
*msg
, size_t size
,
1984 struct sock
*sk
= sock
->sk
;
1986 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1989 return unix_dgram_recvmsg(iocb
, sock
, msg
, size
, flags
);
1992 static void unix_copy_addr(struct msghdr
*msg
, struct sock
*sk
)
1994 struct unix_sock
*u
= unix_sk(sk
);
1997 msg
->msg_namelen
= u
->addr
->len
;
1998 memcpy(msg
->msg_name
, u
->addr
->name
, u
->addr
->len
);
2002 static int unix_dgram_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
2003 struct msghdr
*msg
, size_t size
,
2006 struct sock_iocb
*siocb
= kiocb_to_siocb(iocb
);
2007 struct scm_cookie tmp_scm
;
2008 struct sock
*sk
= sock
->sk
;
2009 struct unix_sock
*u
= unix_sk(sk
);
2010 int noblock
= flags
& MSG_DONTWAIT
;
2011 struct sk_buff
*skb
;
2019 err
= mutex_lock_interruptible(&u
->readlock
);
2020 if (unlikely(err
)) {
2021 /* recvmsg() in non blocking mode is supposed to return -EAGAIN
2022 * sk_rcvtimeo is not honored by mutex_lock_interruptible()
2024 err
= noblock
? -EAGAIN
: -ERESTARTSYS
;
2028 skip
= sk_peek_offset(sk
, flags
);
2030 skb
= __skb_recv_datagram(sk
, flags
, &peeked
, &skip
, &err
);
2032 unix_state_lock(sk
);
2033 /* Signal EOF on disconnected non-blocking SEQPACKET socket. */
2034 if (sk
->sk_type
== SOCK_SEQPACKET
&& err
== -EAGAIN
&&
2035 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
2037 unix_state_unlock(sk
);
2041 wake_up_interruptible_sync_poll(&u
->peer_wait
,
2042 POLLOUT
| POLLWRNORM
| POLLWRBAND
);
2045 unix_copy_addr(msg
, skb
->sk
);
2047 if (size
> skb
->len
- skip
)
2048 size
= skb
->len
- skip
;
2049 else if (size
< skb
->len
- skip
)
2050 msg
->msg_flags
|= MSG_TRUNC
;
2052 err
= skb_copy_datagram_iovec(skb
, skip
, msg
->msg_iov
, size
);
2056 if (sock_flag(sk
, SOCK_RCVTSTAMP
))
2057 __sock_recv_timestamp(msg
, sk
, skb
);
2060 siocb
->scm
= &tmp_scm
;
2061 memset(&tmp_scm
, 0, sizeof(tmp_scm
));
2063 scm_set_cred(siocb
->scm
, UNIXCB(skb
).pid
, UNIXCB(skb
).uid
, UNIXCB(skb
).gid
);
2064 unix_set_secdata(siocb
->scm
, skb
);
2066 if (!(flags
& MSG_PEEK
)) {
2068 unix_detach_fds(siocb
->scm
, skb
);
2070 sk_peek_offset_bwd(sk
, skb
->len
);
2072 /* It is questionable: on PEEK we could:
2073 - do not return fds - good, but too simple 8)
2074 - return fds, and do not return them on read (old strategy,
2076 - clone fds (I chose it for now, it is the most universal
2079 POSIX 1003.1g does not actually define this clearly
2080 at all. POSIX 1003.1g doesn't define a lot of things
2085 sk_peek_offset_fwd(sk
, size
);
2088 siocb
->scm
->fp
= scm_fp_dup(UNIXCB(skb
).fp
);
2090 err
= (flags
& MSG_TRUNC
) ? skb
->len
- skip
: size
;
2092 scm_recv(sock
, msg
, siocb
->scm
, flags
);
2095 skb_free_datagram(sk
, skb
);
2097 mutex_unlock(&u
->readlock
);
2104 * Sleep until more data has arrived. But check for races..
2106 static long unix_stream_data_wait(struct sock
*sk
, long timeo
,
2107 struct sk_buff
*last
)
2111 unix_state_lock(sk
);
2114 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
2116 if (skb_peek_tail(&sk
->sk_receive_queue
) != last
||
2118 (sk
->sk_shutdown
& RCV_SHUTDOWN
) ||
2119 signal_pending(current
) ||
2123 set_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
2124 unix_state_unlock(sk
);
2125 timeo
= freezable_schedule_timeout(timeo
);
2126 unix_state_lock(sk
);
2127 clear_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
2130 finish_wait(sk_sleep(sk
), &wait
);
2131 unix_state_unlock(sk
);
2135 static int unix_stream_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
2136 struct msghdr
*msg
, size_t size
,
2139 struct sock_iocb
*siocb
= kiocb_to_siocb(iocb
);
2140 struct scm_cookie tmp_scm
;
2141 struct sock
*sk
= sock
->sk
;
2142 struct unix_sock
*u
= unix_sk(sk
);
2143 struct sockaddr_un
*sunaddr
= msg
->msg_name
;
2145 int noblock
= flags
& MSG_DONTWAIT
;
2146 int check_creds
= 0;
2151 struct sock
* other
= unix_peer(sk
);
2154 if (sk
->sk_state
!= TCP_ESTABLISHED
)
2161 target
= sock_rcvlowat(sk
, flags
&MSG_WAITALL
, size
);
2162 timeo
= sock_rcvtimeo(sk
, noblock
);
2164 /* Lock the socket to prevent queue disordering
2165 * while sleeps in memcpy_tomsg
2169 siocb
->scm
= &tmp_scm
;
2170 memset(&tmp_scm
, 0, sizeof(tmp_scm
));
2173 err
= mutex_lock_interruptible(&u
->readlock
);
2174 if (unlikely(err
)) {
2175 /* recvmsg() in non blocking mode is supposed to return -EAGAIN
2176 * sk_rcvtimeo is not honored by mutex_lock_interruptible()
2178 err
= noblock
? -EAGAIN
: -ERESTARTSYS
;
2184 struct sk_buff
*skb
, *last
;
2186 unix_state_lock(sk
);
2187 last
= skb
= skb_peek(&sk
->sk_receive_queue
);
2190 unix_sk(sk
)->recursion_level
= 0;
2191 if (copied
>= target
)
2195 * POSIX 1003.1g mandates this order.
2198 err
= sock_error(sk
);
2201 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
2203 if(sk
&& sk
->sk_socket
)
2205 if(other
&& other
->sk_socket
){
2206 #ifdef CONFIG_MTK_NET_LOGGING
2208 printk(KERN_INFO
" [mtk_net][unix]: recvmsg[%lu:%lu]:exit read due to peer shutdown \n" ,SOCK_INODE(sk
->sk_socket
)->i_ino
,SOCK_INODE(other
->sk_socket
)->i_ino
);
2211 #ifdef CONFIG_MTK_NET_LOGGING
2212 printk(KERN_INFO
"[mtk_net][unix]: recvmsg[%lu:null]:exit read due to peer shutdown \n" ,SOCK_INODE(sk
->sk_socket
)->i_ino
);
2217 #ifdef CONFIG_MTK_NET_LOGGING
2218 printk(KERN_INFO
" [mtk_net][unix]: recvmsg: exit read due to peer shutdown \n" );
2223 unix_state_unlock(sk
);
2227 mutex_unlock(&u
->readlock
);
2229 timeo
= unix_stream_data_wait(sk
, timeo
, last
);
2232 if(sk
&& sk
->sk_socket
)
2234 if(other
&& other
->sk_socket
){
2235 #ifdef CONFIG_MTK_NET_LOGGING
2236 printk(KERN_INFO
" [mtk_net][unix]: recvmsg[%lu:%lu]:exit read due to timeout \n" ,SOCK_INODE(sk
->sk_socket
)->i_ino
,SOCK_INODE(other
->sk_socket
)->i_ino
);
2239 #ifdef CONFIG_MTK_NET_LOGGING
2240 printk(KERN_INFO
" [mtk_net][unix]: recvmsg[%lu:null]:exit read due to timeout \n" ,SOCK_INODE(sk
->sk_socket
)->i_ino
);
2246 #ifdef CONFIG_MTK_NET_LOGGING
2247 printk(KERN_INFO
" [mtk_net][unix]: recvmsg:exit read due to timeout \n" );
2253 if (signal_pending(current
)
2254 || mutex_lock_interruptible(&u
->readlock
)) {
2255 err
= sock_intr_errno(timeo
);
2261 unix_state_unlock(sk
);
2265 skip
= sk_peek_offset(sk
, flags
);
2266 while (skip
>= skb
->len
) {
2269 skb
= skb_peek_next(skb
, &sk
->sk_receive_queue
);
2274 unix_state_unlock(sk
);
2277 /* Never glue messages from different writers */
2278 if ((UNIXCB(skb
).pid
!= siocb
->scm
->pid
) ||
2279 !uid_eq(UNIXCB(skb
).uid
, siocb
->scm
->creds
.uid
) ||
2280 !gid_eq(UNIXCB(skb
).gid
, siocb
->scm
->creds
.gid
))
2282 } else if (test_bit(SOCK_PASSCRED
, &sock
->flags
)) {
2283 /* Copy credentials */
2284 scm_set_cred(siocb
->scm
, UNIXCB(skb
).pid
, UNIXCB(skb
).uid
, UNIXCB(skb
).gid
);
2288 /* Copy address just once */
2290 unix_copy_addr(msg
, skb
->sk
);
2294 chunk
= min_t(unsigned int, skb
->len
- skip
, size
);
2295 if (memcpy_toiovec(msg
->msg_iov
, skb
->data
+ skip
, chunk
)) {
2303 /* Mark read part of skb as used */
2304 if (!(flags
& MSG_PEEK
)) {
2305 skb_pull(skb
, chunk
);
2307 sk_peek_offset_bwd(sk
, chunk
);
2310 unix_detach_fds(siocb
->scm
, skb
);
2315 skb_unlink(skb
, &sk
->sk_receive_queue
);
2321 /* It is questionable, see note in unix_dgram_recvmsg.
2324 siocb
->scm
->fp
= scm_fp_dup(UNIXCB(skb
).fp
);
2326 sk_peek_offset_fwd(sk
, chunk
);
2332 mutex_unlock(&u
->readlock
);
2333 scm_recv(sock
, msg
, siocb
->scm
, flags
);
2336 return copied
? : err
;
2339 static int unix_shutdown(struct socket
*sock
, int mode
)
2341 struct sock
*sk
= sock
->sk
;
2344 if (mode
< SHUT_RD
|| mode
> SHUT_RDWR
)
2347 * SHUT_RD (0) -> RCV_SHUTDOWN (1)
2348 * SHUT_WR (1) -> SEND_SHUTDOWN (2)
2349 * SHUT_RDWR (2) -> SHUTDOWN_MASK (3)
2353 unix_state_lock(sk
);
2354 sk
->sk_shutdown
|= mode
;
2355 other
= unix_peer(sk
);
2358 unix_state_unlock(sk
);
2359 sk
->sk_state_change(sk
);
2362 (sk
->sk_type
== SOCK_STREAM
|| sk
->sk_type
== SOCK_SEQPACKET
)) {
2366 if (mode
&RCV_SHUTDOWN
)
2367 peer_mode
|= SEND_SHUTDOWN
;
2368 if (mode
&SEND_SHUTDOWN
)
2369 peer_mode
|= RCV_SHUTDOWN
;
2370 unix_state_lock(other
);
2371 other
->sk_shutdown
|= peer_mode
;
2372 unix_state_unlock(other
);
2373 other
->sk_state_change(other
);
2374 if (peer_mode
== SHUTDOWN_MASK
)
2375 sk_wake_async(other
, SOCK_WAKE_WAITD
, POLL_HUP
);
2376 else if (peer_mode
& RCV_SHUTDOWN
)
2377 sk_wake_async(other
, SOCK_WAKE_WAITD
, POLL_IN
);
2385 long unix_inq_len(struct sock
*sk
)
2387 struct sk_buff
*skb
;
2390 if (sk
->sk_state
== TCP_LISTEN
)
2393 spin_lock(&sk
->sk_receive_queue
.lock
);
2394 if (sk
->sk_type
== SOCK_STREAM
||
2395 sk
->sk_type
== SOCK_SEQPACKET
) {
2396 skb_queue_walk(&sk
->sk_receive_queue
, skb
)
2399 skb
= skb_peek(&sk
->sk_receive_queue
);
2403 spin_unlock(&sk
->sk_receive_queue
.lock
);
2407 EXPORT_SYMBOL_GPL(unix_inq_len
);
2409 long unix_outq_len(struct sock
*sk
)
2411 return sk_wmem_alloc_get(sk
);
2413 EXPORT_SYMBOL_GPL(unix_outq_len
);
2415 static int unix_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
2417 struct sock
*sk
= sock
->sk
;
2423 amount
= unix_outq_len(sk
);
2424 err
= put_user(amount
, (int __user
*)arg
);
2427 amount
= unix_inq_len(sk
);
2431 err
= put_user(amount
, (int __user
*)arg
);
2440 static unsigned int unix_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
2442 struct sock
*sk
= sock
->sk
;
2445 sock_poll_wait(file
, sk_sleep(sk
), wait
);
2448 /* exceptional events? */
2451 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
2453 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
2454 mask
|= POLLRDHUP
| POLLIN
| POLLRDNORM
;
2457 if (!skb_queue_empty(&sk
->sk_receive_queue
))
2458 mask
|= POLLIN
| POLLRDNORM
;
2460 /* Connection-based need to check for termination and startup */
2461 if ((sk
->sk_type
== SOCK_STREAM
|| sk
->sk_type
== SOCK_SEQPACKET
) &&
2462 sk
->sk_state
== TCP_CLOSE
)
2466 * we set writable also when the other side has shut down the
2467 * connection. This prevents stuck sockets.
2469 if (unix_writable(sk
))
2470 mask
|= POLLOUT
| POLLWRNORM
| POLLWRBAND
;
2475 static unsigned int unix_dgram_poll(struct file
*file
, struct socket
*sock
,
2478 struct sock
*sk
= sock
->sk
, *other
;
2479 unsigned int mask
, writable
;
2481 sock_poll_wait(file
, sk_sleep(sk
), wait
);
2484 /* exceptional events? */
2485 if (sk
->sk_err
|| !skb_queue_empty(&sk
->sk_error_queue
))
2487 (sock_flag(sk
, SOCK_SELECT_ERR_QUEUE
) ? POLLPRI
: 0);
2489 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
2490 mask
|= POLLRDHUP
| POLLIN
| POLLRDNORM
;
2491 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
2495 if (!skb_queue_empty(&sk
->sk_receive_queue
))
2496 mask
|= POLLIN
| POLLRDNORM
;
2498 /* Connection-based need to check for termination and startup */
2499 if (sk
->sk_type
== SOCK_SEQPACKET
) {
2500 if (sk
->sk_state
== TCP_CLOSE
)
2502 /* connection hasn't started yet? */
2503 if (sk
->sk_state
== TCP_SYN_SENT
)
2510 /* No write status requested, avoid expensive OUT tests. */
2511 if (!(poll_requested_events(wait
) & (POLLWRBAND
|POLLWRNORM
|POLLOUT
)))
2516 writable
= unix_writable(sk
);
2518 unix_state_lock(sk
);
2520 other
= unix_peer(sk
);
2521 if (other
&& unix_peer(other
) != sk
&&
2522 unix_recvq_full(other
) &&
2523 unix_dgram_peer_wake_me(sk
, other
))
2526 unix_state_unlock(sk
);
2530 mask
|= POLLOUT
| POLLWRNORM
| POLLWRBAND
;
2532 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
2537 #ifdef CONFIG_PROC_FS
2539 #define BUCKET_SPACE (BITS_PER_LONG - (UNIX_HASH_BITS + 1) - 1)
2541 #define get_bucket(x) ((x) >> BUCKET_SPACE)
2542 #define get_offset(x) ((x) & ((1L << BUCKET_SPACE) - 1))
2543 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
2545 static struct sock
*unix_from_bucket(struct seq_file
*seq
, loff_t
*pos
)
2547 unsigned long offset
= get_offset(*pos
);
2548 unsigned long bucket
= get_bucket(*pos
);
2550 unsigned long count
= 0;
2552 for (sk
= sk_head(&unix_socket_table
[bucket
]); sk
; sk
= sk_next(sk
)) {
2553 if (sock_net(sk
) != seq_file_net(seq
))
2555 if (++count
== offset
)
2562 static struct sock
*unix_next_socket(struct seq_file
*seq
,
2566 unsigned long bucket
;
2568 while (sk
> (struct sock
*)SEQ_START_TOKEN
) {
2572 if (sock_net(sk
) == seq_file_net(seq
))
2577 sk
= unix_from_bucket(seq
, pos
);
2582 bucket
= get_bucket(*pos
) + 1;
2583 *pos
= set_bucket_offset(bucket
, 1);
2584 } while (bucket
< ARRAY_SIZE(unix_socket_table
));
2589 static void *unix_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2590 __acquires(unix_table_lock
)
2592 spin_lock(&unix_table_lock
);
2595 return SEQ_START_TOKEN
;
2597 if (get_bucket(*pos
) >= ARRAY_SIZE(unix_socket_table
))
2600 return unix_next_socket(seq
, NULL
, pos
);
2603 static void *unix_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2606 return unix_next_socket(seq
, v
, pos
);
2609 static void unix_seq_stop(struct seq_file
*seq
, void *v
)
2610 __releases(unix_table_lock
)
2612 spin_unlock(&unix_table_lock
);
2615 static int unix_seq_show(struct seq_file
*seq
, void *v
)
2618 if (v
== SEQ_START_TOKEN
)
2619 seq_puts(seq
, "Num RefCount Protocol Flags Type St "
2623 struct unix_sock
*u
= unix_sk(s
);
2626 seq_printf(seq
, "%pK: %08X %08X %08X %04X %02X %5lu",
2628 atomic_read(&s
->sk_refcnt
),
2630 s
->sk_state
== TCP_LISTEN
? __SO_ACCEPTCON
: 0,
2633 (s
->sk_state
== TCP_ESTABLISHED
? SS_CONNECTED
: SS_UNCONNECTED
) :
2634 (s
->sk_state
== TCP_ESTABLISHED
? SS_CONNECTING
: SS_DISCONNECTING
),
2642 len
= u
->addr
->len
- sizeof(short);
2643 if (!UNIX_ABSTRACT(s
))
2649 for ( ; i
< len
; i
++)
2650 seq_putc(seq
, u
->addr
->name
->sun_path
[i
]);
2652 unix_state_unlock(s
);
2653 seq_putc(seq
, '\n');
2659 static const struct seq_operations unix_seq_ops
= {
2660 .start
= unix_seq_start
,
2661 .next
= unix_seq_next
,
2662 .stop
= unix_seq_stop
,
2663 .show
= unix_seq_show
,
2666 static int unix_seq_open(struct inode
*inode
, struct file
*file
)
2668 return seq_open_net(inode
, file
, &unix_seq_ops
,
2669 sizeof(struct seq_net_private
));
2672 static const struct file_operations unix_seq_fops
= {
2673 .owner
= THIS_MODULE
,
2674 .open
= unix_seq_open
,
2676 .llseek
= seq_lseek
,
2677 .release
= seq_release_net
,
2682 static const struct net_proto_family unix_family_ops
= {
2684 .create
= unix_create
,
2685 .owner
= THIS_MODULE
,
2689 static int __net_init
unix_net_init(struct net
*net
)
2691 int error
= -ENOMEM
;
2693 net
->unx
.sysctl_max_dgram_qlen
= 10;
2694 if (unix_sysctl_register(net
))
2697 #ifdef CONFIG_PROC_FS
2698 if (!proc_create("unix", 0, net
->proc_net
, &unix_seq_fops
)) {
2699 unix_sysctl_unregister(net
);
2708 static void __net_exit
unix_net_exit(struct net
*net
)
2710 unix_sysctl_unregister(net
);
2711 remove_proc_entry("unix", net
->proc_net
);
2714 static struct pernet_operations unix_net_ops
= {
2715 .init
= unix_net_init
,
2716 .exit
= unix_net_exit
,
2719 static int __init
af_unix_init(void)
2723 BUILD_BUG_ON(sizeof(struct unix_skb_parms
) > FIELD_SIZEOF(struct sk_buff
, cb
));
2725 rc
= proto_register(&unix_proto
, 1);
2727 printk(KERN_CRIT
"%s: Cannot create unix_sock SLAB cache!\n",
2732 sock_register(&unix_family_ops
);
2733 register_pernet_subsys(&unix_net_ops
);
2738 static void __exit
af_unix_exit(void)
2740 sock_unregister(PF_UNIX
);
2741 proto_unregister(&unix_proto
);
2742 unregister_pernet_subsys(&unix_net_ops
);
2745 /* Earlier than device_initcall() so that other drivers invoking
2746 request_module() don't end up in a loop when modprobe tries
2747 to use a UNIX socket. But later than subsys_initcall() because
2748 we depend on stuff initialised there */
2749 fs_initcall(af_unix_init
);
2750 module_exit(af_unix_exit
);
2752 MODULE_LICENSE("GPL");
2753 MODULE_ALIAS_NETPROTO(PF_UNIX
);