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usblp: Cosmetics
[linux-2.6/x86.git] / net / core / sock.c
blob4ed9b507c1e78d519488088e0285785ad1460f9b
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
10 * Version: $Id: sock.c,v 1.117 2002/02/01 22:01:03 davem Exp $
11 *
12 * Authors: Ross Biro
13 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
14 * Florian La Roche, <flla@stud.uni-sb.de>
15 * Alan Cox, <A.Cox@swansea.ac.uk>
16 *
17 * Fixes:
18 * Alan Cox : Numerous verify_area() problems
19 * Alan Cox : Connecting on a connecting socket
20 * now returns an error for tcp.
21 * Alan Cox : sock->protocol is set correctly.
22 * and is not sometimes left as 0.
23 * Alan Cox : connect handles icmp errors on a
24 * connect properly. Unfortunately there
25 * is a restart syscall nasty there. I
26 * can't match BSD without hacking the C
27 * library. Ideas urgently sought!
28 * Alan Cox : Disallow bind() to addresses that are
29 * not ours - especially broadcast ones!!
30 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
31 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
32 * instead they leave that for the DESTROY timer.
33 * Alan Cox : Clean up error flag in accept
34 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
35 * was buggy. Put a remove_sock() in the handler
36 * for memory when we hit 0. Also altered the timer
37 * code. The ACK stuff can wait and needs major
38 * TCP layer surgery.
39 * Alan Cox : Fixed TCP ack bug, removed remove sock
40 * and fixed timer/inet_bh race.
41 * Alan Cox : Added zapped flag for TCP
42 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
43 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
44 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
45 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
46 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
47 * Rick Sladkey : Relaxed UDP rules for matching packets.
48 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
49 * Pauline Middelink : identd support
50 * Alan Cox : Fixed connect() taking signals I think.
51 * Alan Cox : SO_LINGER supported
52 * Alan Cox : Error reporting fixes
53 * Anonymous : inet_create tidied up (sk->reuse setting)
54 * Alan Cox : inet sockets don't set sk->type!
55 * Alan Cox : Split socket option code
56 * Alan Cox : Callbacks
57 * Alan Cox : Nagle flag for Charles & Johannes stuff
58 * Alex : Removed restriction on inet fioctl
59 * Alan Cox : Splitting INET from NET core
60 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
61 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
62 * Alan Cox : Split IP from generic code
63 * Alan Cox : New kfree_skbmem()
64 * Alan Cox : Make SO_DEBUG superuser only.
65 * Alan Cox : Allow anyone to clear SO_DEBUG
66 * (compatibility fix)
67 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
68 * Alan Cox : Allocator for a socket is settable.
69 * Alan Cox : SO_ERROR includes soft errors.
70 * Alan Cox : Allow NULL arguments on some SO_ opts
71 * Alan Cox : Generic socket allocation to make hooks
72 * easier (suggested by Craig Metz).
73 * Michael Pall : SO_ERROR returns positive errno again
74 * Steve Whitehouse: Added default destructor to free
75 * protocol private data.
76 * Steve Whitehouse: Added various other default routines
77 * common to several socket families.
78 * Chris Evans : Call suser() check last on F_SETOWN
79 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
80 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
81 * Andi Kleen : Fix write_space callback
82 * Chris Evans : Security fixes - signedness again
83 * Arnaldo C. Melo : cleanups, use skb_queue_purge
84 *
85 * To Fix:
86 *
87 *
88 * This program is free software; you can redistribute it and/or
89 * modify it under the terms of the GNU General Public License
90 * as published by the Free Software Foundation; either version
91 * 2 of the License, or (at your option) any later version.
92 */
93
94 #include <linux/capability.h>
95 #include <linux/errno.h>
96 #include <linux/types.h>
97 #include <linux/socket.h>
98 #include <linux/in.h>
99 #include <linux/kernel.h>
100 #include <linux/module.h>
101 #include <linux/proc_fs.h>
102 #include <linux/seq_file.h>
103 #include <linux/sched.h>
104 #include <linux/timer.h>
105 #include <linux/string.h>
106 #include <linux/sockios.h>
107 #include <linux/net.h>
108 #include <linux/mm.h>
109 #include <linux/slab.h>
110 #include <linux/interrupt.h>
111 #include <linux/poll.h>
112 #include <linux/tcp.h>
113 #include <linux/init.h>
114 #include <linux/highmem.h>
115
116 #include <asm/uaccess.h>
117 #include <asm/system.h>
118
119 #include <linux/netdevice.h>
120 #include <net/protocol.h>
121 #include <linux/skbuff.h>
122 #include <net/net_namespace.h>
123 #include <net/request_sock.h>
124 #include <net/sock.h>
125 #include <net/xfrm.h>
126 #include <linux/ipsec.h>
127
128 #include <linux/filter.h>
129
130 #ifdef CONFIG_INET
131 #include <net/tcp.h>
132 #endif
133
134 /*
135 * Each address family might have different locking rules, so we have
136 * one slock key per address family:
137 */
138 static struct lock_class_key af_family_keys[AF_MAX];
139 static struct lock_class_key af_family_slock_keys[AF_MAX];
140
141 #ifdef CONFIG_DEBUG_LOCK_ALLOC
142 /*
143 * Make lock validator output more readable. (we pre-construct these
144 * strings build-time, so that runtime initialization of socket
145 * locks is fast):
146 */
147 static const char *af_family_key_strings[AF_MAX+1] = {
148 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
149 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
150 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
151 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
152 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
153 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
154 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
155 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
156 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
157 "sk_lock-27" , "sk_lock-28" , "sk_lock-29" ,
158 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
159 "sk_lock-AF_RXRPC" , "sk_lock-AF_MAX"
160 };
161 static const char *af_family_slock_key_strings[AF_MAX+1] = {
162 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
163 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
164 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
165 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
166 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
167 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
168 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
169 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" ,
170 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
171 "slock-27" , "slock-28" , "slock-29" ,
172 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
173 "slock-AF_RXRPC" , "slock-AF_MAX"
174 };
175 static const char *af_family_clock_key_strings[AF_MAX+1] = {
176 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
177 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
178 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
179 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
180 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
181 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
182 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
183 "clock-21" , "clock-AF_SNA" , "clock-AF_IRDA" ,
184 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
185 "clock-27" , "clock-28" , "clock-29" ,
186 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
187 "clock-AF_RXRPC" , "clock-AF_MAX"
188 };
189 #endif
190
191 /*
192 * sk_callback_lock locking rules are per-address-family,
193 * so split the lock classes by using a per-AF key:
194 */
195 static struct lock_class_key af_callback_keys[AF_MAX];
196
197 /* Take into consideration the size of the struct sk_buff overhead in the
198 * determination of these values, since that is non-constant across
199 * platforms. This makes socket queueing behavior and performance
200 * not depend upon such differences.
201 */
202 #define _SK_MEM_PACKETS 256
203 #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
204 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
205 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
206
207 /* Run time adjustable parameters. */
208 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
209 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
210 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
211 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
212
213 /* Maximal space eaten by iovec or ancilliary data plus some space */
214 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
215
216 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
217 {
218 struct timeval tv;
219
220 if (optlen < sizeof(tv))
221 return -EINVAL;
222 if (copy_from_user(&tv, optval, sizeof(tv)))
223 return -EFAULT;
224 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
225 return -EDOM;
226
227 if (tv.tv_sec < 0) {
228 static int warned __read_mostly;
229
230 *timeo_p = 0;
231 if (warned < 10 && net_ratelimit())
232 warned++;
233 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
234 "tries to set negative timeout\n",
235 current->comm, current->pid);
236 return 0;
237 }
238 *timeo_p = MAX_SCHEDULE_TIMEOUT;
239 if (tv.tv_sec == 0 && tv.tv_usec == 0)
240 return 0;
241 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
242 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
243 return 0;
244 }
245
246 static void sock_warn_obsolete_bsdism(const char *name)
247 {
248 static int warned;
249 static char warncomm[TASK_COMM_LEN];
250 if (strcmp(warncomm, current->comm) && warned < 5) {
251 strcpy(warncomm, current->comm);
252 printk(KERN_WARNING "process `%s' is using obsolete "
253 "%s SO_BSDCOMPAT\n", warncomm, name);
254 warned++;
255 }
256 }
257
258 static void sock_disable_timestamp(struct sock *sk)
259 {
260 if (sock_flag(sk, SOCK_TIMESTAMP)) {
261 sock_reset_flag(sk, SOCK_TIMESTAMP);
262 net_disable_timestamp();
263 }
264 }
265
266
267 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
268 {
269 int err = 0;
270 int skb_len;
271
272 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
273 number of warnings when compiling with -W --ANK
274 */
275 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
276 (unsigned)sk->sk_rcvbuf) {
277 err = -ENOMEM;
278 goto out;
279 }
280
281 err = sk_filter(sk, skb);
282 if (err)
283 goto out;
284
285 skb->dev = NULL;
286 skb_set_owner_r(skb, sk);
287
288 /* Cache the SKB length before we tack it onto the receive
289 * queue. Once it is added it no longer belongs to us and
290 * may be freed by other threads of control pulling packets
291 * from the queue.
292 */
293 skb_len = skb->len;
294
295 skb_queue_tail(&sk->sk_receive_queue, skb);
296
297 if (!sock_flag(sk, SOCK_DEAD))
298 sk->sk_data_ready(sk, skb_len);
299 out:
300 return err;
301 }
302 EXPORT_SYMBOL(sock_queue_rcv_skb);
303
304 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
305 {
306 int rc = NET_RX_SUCCESS;
307
308 if (sk_filter(sk, skb))
309 goto discard_and_relse;
310
311 skb->dev = NULL;
312
313 if (nested)
314 bh_lock_sock_nested(sk);
315 else
316 bh_lock_sock(sk);
317 if (!sock_owned_by_user(sk)) {
318 /*
319 * trylock + unlock semantics:
320 */
321 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
322
323 rc = sk->sk_backlog_rcv(sk, skb);
324
325 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
326 } else
327 sk_add_backlog(sk, skb);
328 bh_unlock_sock(sk);
329 out:
330 sock_put(sk);
331 return rc;
332 discard_and_relse:
333 kfree_skb(skb);
334 goto out;
335 }
336 EXPORT_SYMBOL(sk_receive_skb);
337
338 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
339 {
340 struct dst_entry *dst = sk->sk_dst_cache;
341
342 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
343 sk->sk_dst_cache = NULL;
344 dst_release(dst);
345 return NULL;
346 }
347
348 return dst;
349 }
350 EXPORT_SYMBOL(__sk_dst_check);
351
352 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
353 {
354 struct dst_entry *dst = sk_dst_get(sk);
355
356 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
357 sk_dst_reset(sk);
358 dst_release(dst);
359 return NULL;
360 }
361
362 return dst;
363 }
364 EXPORT_SYMBOL(sk_dst_check);
365
366 static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
367 {
368 int ret = -ENOPROTOOPT;
369 #ifdef CONFIG_NETDEVICES
370 struct net *net = sk->sk_net;
371 char devname[IFNAMSIZ];
372 int index;
373
374 /* Sorry... */
375 ret = -EPERM;
376 if (!capable(CAP_NET_RAW))
377 goto out;
378
379 ret = -EINVAL;
380 if (optlen < 0)
381 goto out;
382
383 /* Bind this socket to a particular device like "eth0",
384 * as specified in the passed interface name. If the
385 * name is "" or the option length is zero the socket
386 * is not bound.
387 */
388 if (optlen > IFNAMSIZ - 1)
389 optlen = IFNAMSIZ - 1;
390 memset(devname, 0, sizeof(devname));
391
392 ret = -EFAULT;
393 if (copy_from_user(devname, optval, optlen))
394 goto out;
395
396 if (devname[0] == '\0') {
397 index = 0;
398 } else {
399 struct net_device *dev = dev_get_by_name(net, devname);
400
401 ret = -ENODEV;
402 if (!dev)
403 goto out;
404
405 index = dev->ifindex;
406 dev_put(dev);
407 }
408
409 lock_sock(sk);
410 sk->sk_bound_dev_if = index;
411 sk_dst_reset(sk);
412 release_sock(sk);
413
414 ret = 0;
415
416 out:
417 #endif
418
419 return ret;
420 }
421
422 /*
423 * This is meant for all protocols to use and covers goings on
424 * at the socket level. Everything here is generic.
425 */
426
427 int sock_setsockopt(struct socket *sock, int level, int optname,
428 char __user *optval, int optlen)
429 {
430 struct sock *sk=sock->sk;
431 struct sk_filter *filter;
432 int val;
433 int valbool;
434 struct linger ling;
435 int ret = 0;
436
437 /*
438 * Options without arguments
439 */
440
441 #ifdef SO_DONTLINGER /* Compatibility item... */
442 if (optname == SO_DONTLINGER) {
443 lock_sock(sk);
444 sock_reset_flag(sk, SOCK_LINGER);
445 release_sock(sk);
446 return 0;
447 }
448 #endif
449
450 if (optname == SO_BINDTODEVICE)
451 return sock_bindtodevice(sk, optval, optlen);
452
453 if (optlen < sizeof(int))
454 return -EINVAL;
455
456 if (get_user(val, (int __user *)optval))
457 return -EFAULT;
458
459 valbool = val?1:0;
460
461 lock_sock(sk);
462
463 switch(optname) {
464 case SO_DEBUG:
465 if (val && !capable(CAP_NET_ADMIN)) {
466 ret = -EACCES;
467 }
468 else if (valbool)
469 sock_set_flag(sk, SOCK_DBG);
470 else
471 sock_reset_flag(sk, SOCK_DBG);
472 break;
473 case SO_REUSEADDR:
474 sk->sk_reuse = valbool;
475 break;
476 case SO_TYPE:
477 case SO_ERROR:
478 ret = -ENOPROTOOPT;
479 break;
480 case SO_DONTROUTE:
481 if (valbool)
482 sock_set_flag(sk, SOCK_LOCALROUTE);
483 else
484 sock_reset_flag(sk, SOCK_LOCALROUTE);
485 break;
486 case SO_BROADCAST:
487 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
488 break;
489 case SO_SNDBUF:
490 /* Don't error on this BSD doesn't and if you think
491 about it this is right. Otherwise apps have to
492 play 'guess the biggest size' games. RCVBUF/SNDBUF
493 are treated in BSD as hints */
494
495 if (val > sysctl_wmem_max)
496 val = sysctl_wmem_max;
497 set_sndbuf:
498 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
499 if ((val * 2) < SOCK_MIN_SNDBUF)
500 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
501 else
502 sk->sk_sndbuf = val * 2;
503
504 /*
505 * Wake up sending tasks if we
506 * upped the value.
507 */
508 sk->sk_write_space(sk);
509 break;
510
511 case SO_SNDBUFFORCE:
512 if (!capable(CAP_NET_ADMIN)) {
513 ret = -EPERM;
514 break;
515 }
516 goto set_sndbuf;
517
518 case SO_RCVBUF:
519 /* Don't error on this BSD doesn't and if you think
520 about it this is right. Otherwise apps have to
521 play 'guess the biggest size' games. RCVBUF/SNDBUF
522 are treated in BSD as hints */
523
524 if (val > sysctl_rmem_max)
525 val = sysctl_rmem_max;
526 set_rcvbuf:
527 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
528 /*
529 * We double it on the way in to account for
530 * "struct sk_buff" etc. overhead. Applications
531 * assume that the SO_RCVBUF setting they make will
532 * allow that much actual data to be received on that
533 * socket.
534 *
535 * Applications are unaware that "struct sk_buff" and
536 * other overheads allocate from the receive buffer
537 * during socket buffer allocation.
538 *
539 * And after considering the possible alternatives,
540 * returning the value we actually used in getsockopt
541 * is the most desirable behavior.
542 */
543 if ((val * 2) < SOCK_MIN_RCVBUF)
544 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
545 else
546 sk->sk_rcvbuf = val * 2;
547 break;
548
549 case SO_RCVBUFFORCE:
550 if (!capable(CAP_NET_ADMIN)) {
551 ret = -EPERM;
552 break;
553 }
554 goto set_rcvbuf;
555
556 case SO_KEEPALIVE:
557 #ifdef CONFIG_INET
558 if (sk->sk_protocol == IPPROTO_TCP)
559 tcp_set_keepalive(sk, valbool);
560 #endif
561 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
562 break;
563
564 case SO_OOBINLINE:
565 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
566 break;
567
568 case SO_NO_CHECK:
569 sk->sk_no_check = valbool;
570 break;
571
572 case SO_PRIORITY:
573 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
574 sk->sk_priority = val;
575 else
576 ret = -EPERM;
577 break;
578
579 case SO_LINGER:
580 if (optlen < sizeof(ling)) {
581 ret = -EINVAL; /* 1003.1g */
582 break;
583 }
584 if (copy_from_user(&ling,optval,sizeof(ling))) {
585 ret = -EFAULT;
586 break;
587 }
588 if (!ling.l_onoff)
589 sock_reset_flag(sk, SOCK_LINGER);
590 else {
591 #if (BITS_PER_LONG == 32)
592 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
593 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
594 else
595 #endif
596 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
597 sock_set_flag(sk, SOCK_LINGER);
598 }
599 break;
600
601 case SO_BSDCOMPAT:
602 sock_warn_obsolete_bsdism("setsockopt");
603 break;
604
605 case SO_PASSCRED:
606 if (valbool)
607 set_bit(SOCK_PASSCRED, &sock->flags);
608 else
609 clear_bit(SOCK_PASSCRED, &sock->flags);
610 break;
611
612 case SO_TIMESTAMP:
613 case SO_TIMESTAMPNS:
614 if (valbool) {
615 if (optname == SO_TIMESTAMP)
616 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
617 else
618 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
619 sock_set_flag(sk, SOCK_RCVTSTAMP);
620 sock_enable_timestamp(sk);
621 } else {
622 sock_reset_flag(sk, SOCK_RCVTSTAMP);
623 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
624 }
625 break;
626
627 case SO_RCVLOWAT:
628 if (val < 0)
629 val = INT_MAX;
630 sk->sk_rcvlowat = val ? : 1;
631 break;
632
633 case SO_RCVTIMEO:
634 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
635 break;
636
637 case SO_SNDTIMEO:
638 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
639 break;
640
641 case SO_ATTACH_FILTER:
642 ret = -EINVAL;
643 if (optlen == sizeof(struct sock_fprog)) {
644 struct sock_fprog fprog;
645
646 ret = -EFAULT;
647 if (copy_from_user(&fprog, optval, sizeof(fprog)))
648 break;
649
650 ret = sk_attach_filter(&fprog, sk);
651 }
652 break;
653
654 case SO_DETACH_FILTER:
655 rcu_read_lock_bh();
656 filter = rcu_dereference(sk->sk_filter);
657 if (filter) {
658 rcu_assign_pointer(sk->sk_filter, NULL);
659 sk_filter_release(sk, filter);
660 rcu_read_unlock_bh();
661 break;
662 }
663 rcu_read_unlock_bh();
664 ret = -ENONET;
665 break;
666
667 case SO_PASSSEC:
668 if (valbool)
669 set_bit(SOCK_PASSSEC, &sock->flags);
670 else
671 clear_bit(SOCK_PASSSEC, &sock->flags);
672 break;
673
674 /* We implement the SO_SNDLOWAT etc to
675 not be settable (1003.1g 5.3) */
676 default:
677 ret = -ENOPROTOOPT;
678 break;
679 }
680 release_sock(sk);
681 return ret;
682 }
683
684
685 int sock_getsockopt(struct socket *sock, int level, int optname,
686 char __user *optval, int __user *optlen)
687 {
688 struct sock *sk = sock->sk;
689
690 union {
691 int val;
692 struct linger ling;
693 struct timeval tm;
694 } v;
695
696 unsigned int lv = sizeof(int);
697 int len;
698
699 if (get_user(len, optlen))
700 return -EFAULT;
701 if (len < 0)
702 return -EINVAL;
703
704 switch(optname) {
705 case SO_DEBUG:
706 v.val = sock_flag(sk, SOCK_DBG);
707 break;
708
709 case SO_DONTROUTE:
710 v.val = sock_flag(sk, SOCK_LOCALROUTE);
711 break;
712
713 case SO_BROADCAST:
714 v.val = !!sock_flag(sk, SOCK_BROADCAST);
715 break;
716
717 case SO_SNDBUF:
718 v.val = sk->sk_sndbuf;
719 break;
720
721 case SO_RCVBUF:
722 v.val = sk->sk_rcvbuf;
723 break;
724
725 case SO_REUSEADDR:
726 v.val = sk->sk_reuse;
727 break;
728
729 case SO_KEEPALIVE:
730 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
731 break;
732
733 case SO_TYPE:
734 v.val = sk->sk_type;
735 break;
736
737 case SO_ERROR:
738 v.val = -sock_error(sk);
739 if (v.val==0)
740 v.val = xchg(&sk->sk_err_soft, 0);
741 break;
742
743 case SO_OOBINLINE:
744 v.val = !!sock_flag(sk, SOCK_URGINLINE);
745 break;
746
747 case SO_NO_CHECK:
748 v.val = sk->sk_no_check;
749 break;
750
751 case SO_PRIORITY:
752 v.val = sk->sk_priority;
753 break;
754
755 case SO_LINGER:
756 lv = sizeof(v.ling);
757 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
758 v.ling.l_linger = sk->sk_lingertime / HZ;
759 break;
760
761 case SO_BSDCOMPAT:
762 sock_warn_obsolete_bsdism("getsockopt");
763 break;
764
765 case SO_TIMESTAMP:
766 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
767 !sock_flag(sk, SOCK_RCVTSTAMPNS);
768 break;
769
770 case SO_TIMESTAMPNS:
771 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
772 break;
773
774 case SO_RCVTIMEO:
775 lv=sizeof(struct timeval);
776 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
777 v.tm.tv_sec = 0;
778 v.tm.tv_usec = 0;
779 } else {
780 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
781 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
782 }
783 break;
784
785 case SO_SNDTIMEO:
786 lv=sizeof(struct timeval);
787 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
788 v.tm.tv_sec = 0;
789 v.tm.tv_usec = 0;
790 } else {
791 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
792 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
793 }
794 break;
795
796 case SO_RCVLOWAT:
797 v.val = sk->sk_rcvlowat;
798 break;
799
800 case SO_SNDLOWAT:
801 v.val=1;
802 break;
803
804 case SO_PASSCRED:
805 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
806 break;
807
808 case SO_PEERCRED:
809 if (len > sizeof(sk->sk_peercred))
810 len = sizeof(sk->sk_peercred);
811 if (copy_to_user(optval, &sk->sk_peercred, len))
812 return -EFAULT;
813 goto lenout;
814
815 case SO_PEERNAME:
816 {
817 char address[128];
818
819 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
820 return -ENOTCONN;
821 if (lv < len)
822 return -EINVAL;
823 if (copy_to_user(optval, address, len))
824 return -EFAULT;
825 goto lenout;
826 }
827
828 /* Dubious BSD thing... Probably nobody even uses it, but
829 * the UNIX standard wants it for whatever reason... -DaveM
830 */
831 case SO_ACCEPTCONN:
832 v.val = sk->sk_state == TCP_LISTEN;
833 break;
834
835 case SO_PASSSEC:
836 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
837 break;
838
839 case SO_PEERSEC:
840 return security_socket_getpeersec_stream(sock, optval, optlen, len);
841
842 default:
843 return -ENOPROTOOPT;
844 }
845
846 if (len > lv)
847 len = lv;
848 if (copy_to_user(optval, &v, len))
849 return -EFAULT;
850 lenout:
851 if (put_user(len, optlen))
852 return -EFAULT;
853 return 0;
854 }
855
856 /*
857 * Initialize an sk_lock.
858 *
859 * (We also register the sk_lock with the lock validator.)
860 */
861 static inline void sock_lock_init(struct sock *sk)
862 {
863 sock_lock_init_class_and_name(sk,
864 af_family_slock_key_strings[sk->sk_family],
865 af_family_slock_keys + sk->sk_family,
866 af_family_key_strings[sk->sk_family],
867 af_family_keys + sk->sk_family);
868 }
869
870 /**
871 * sk_alloc - All socket objects are allocated here
872 * @family: protocol family
873 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
874 * @prot: struct proto associated with this new sock instance
875 * @zero_it: if we should zero the newly allocated sock
876 */
877 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
878 struct proto *prot, int zero_it)
879 {
880 struct sock *sk = NULL;
881 struct kmem_cache *slab = prot->slab;
882
883 if (slab != NULL)
884 sk = kmem_cache_alloc(slab, priority);
885 else
886 sk = kmalloc(prot->obj_size, priority);
887
888 if (sk) {
889 if (zero_it) {
890 memset(sk, 0, prot->obj_size);
891 sk->sk_family = family;
892 /*
893 * See comment in struct sock definition to understand
894 * why we need sk_prot_creator -acme
895 */
896 sk->sk_prot = sk->sk_prot_creator = prot;
897 sock_lock_init(sk);
898 sk->sk_net = get_net(net);
899 }
900
901 if (security_sk_alloc(sk, family, priority))
902 goto out_free;
903
904 if (!try_module_get(prot->owner))
905 goto out_free;
906 }
907 return sk;
908
909 out_free:
910 if (slab != NULL)
911 kmem_cache_free(slab, sk);
912 else
913 kfree(sk);
914 return NULL;
915 }
916
917 void sk_free(struct sock *sk)
918 {
919 struct sk_filter *filter;
920 struct module *owner = sk->sk_prot_creator->owner;
921
922 if (sk->sk_destruct)
923 sk->sk_destruct(sk);
924
925 filter = rcu_dereference(sk->sk_filter);
926 if (filter) {
927 sk_filter_release(sk, filter);
928 rcu_assign_pointer(sk->sk_filter, NULL);
929 }
930
931 sock_disable_timestamp(sk);
932
933 if (atomic_read(&sk->sk_omem_alloc))
934 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
935 __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
936
937 security_sk_free(sk);
938 put_net(sk->sk_net);
939 if (sk->sk_prot_creator->slab != NULL)
940 kmem_cache_free(sk->sk_prot_creator->slab, sk);
941 else
942 kfree(sk);
943 module_put(owner);
944 }
945
946 struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
947 {
948 struct sock *newsk = sk_alloc(sk->sk_net, sk->sk_family, priority, sk->sk_prot, 0);
949
950 if (newsk != NULL) {
951 struct sk_filter *filter;
952
953 sock_copy(newsk, sk);
954
955 /* SANITY */
956 sk_node_init(&newsk->sk_node);
957 sock_lock_init(newsk);
958 bh_lock_sock(newsk);
959 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
960
961 atomic_set(&newsk->sk_rmem_alloc, 0);
962 atomic_set(&newsk->sk_wmem_alloc, 0);
963 atomic_set(&newsk->sk_omem_alloc, 0);
964 skb_queue_head_init(&newsk->sk_receive_queue);
965 skb_queue_head_init(&newsk->sk_write_queue);
966 #ifdef CONFIG_NET_DMA
967 skb_queue_head_init(&newsk->sk_async_wait_queue);
968 #endif
969
970 rwlock_init(&newsk->sk_dst_lock);
971 rwlock_init(&newsk->sk_callback_lock);
972 lockdep_set_class_and_name(&newsk->sk_callback_lock,
973 af_callback_keys + newsk->sk_family,
974 af_family_clock_key_strings[newsk->sk_family]);
975
976 newsk->sk_dst_cache = NULL;
977 newsk->sk_wmem_queued = 0;
978 newsk->sk_forward_alloc = 0;
979 newsk->sk_send_head = NULL;
980 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
981
982 sock_reset_flag(newsk, SOCK_DONE);
983 skb_queue_head_init(&newsk->sk_error_queue);
984
985 filter = newsk->sk_filter;
986 if (filter != NULL)
987 sk_filter_charge(newsk, filter);
988
989 if (unlikely(xfrm_sk_clone_policy(newsk))) {
990 /* It is still raw copy of parent, so invalidate
991 * destructor and make plain sk_free() */
992 newsk->sk_destruct = NULL;
993 sk_free(newsk);
994 newsk = NULL;
995 goto out;
996 }
997
998 newsk->sk_err = 0;
999 newsk->sk_priority = 0;
1000 atomic_set(&newsk->sk_refcnt, 2);
1001
1002 /*
1003 * Increment the counter in the same struct proto as the master
1004 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1005 * is the same as sk->sk_prot->socks, as this field was copied
1006 * with memcpy).
1007 *
1008 * This _changes_ the previous behaviour, where
1009 * tcp_create_openreq_child always was incrementing the
1010 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1011 * to be taken into account in all callers. -acme
1012 */
1013 sk_refcnt_debug_inc(newsk);
1014 newsk->sk_socket = NULL;
1015 newsk->sk_sleep = NULL;
1016
1017 if (newsk->sk_prot->sockets_allocated)
1018 atomic_inc(newsk->sk_prot->sockets_allocated);
1019 }
1020 out:
1021 return newsk;
1022 }
1023
1024 EXPORT_SYMBOL_GPL(sk_clone);
1025
1026 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1027 {
1028 __sk_dst_set(sk, dst);
1029 sk->sk_route_caps = dst->dev->features;
1030 if (sk->sk_route_caps & NETIF_F_GSO)
1031 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1032 if (sk_can_gso(sk)) {
1033 if (dst->header_len)
1034 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1035 else
1036 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1037 }
1038 }
1039 EXPORT_SYMBOL_GPL(sk_setup_caps);
1040
1041 void __init sk_init(void)
1042 {
1043 if (num_physpages <= 4096) {
1044 sysctl_wmem_max = 32767;
1045 sysctl_rmem_max = 32767;
1046 sysctl_wmem_default = 32767;
1047 sysctl_rmem_default = 32767;
1048 } else if (num_physpages >= 131072) {
1049 sysctl_wmem_max = 131071;
1050 sysctl_rmem_max = 131071;
1051 }
1052 }
1053
1054 /*
1055 * Simple resource managers for sockets.
1056 */
1057
1058
1059 /*
1060 * Write buffer destructor automatically called from kfree_skb.
1061 */
1062 void sock_wfree(struct sk_buff *skb)
1063 {
1064 struct sock *sk = skb->sk;
1065
1066 /* In case it might be waiting for more memory. */
1067 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1068 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1069 sk->sk_write_space(sk);
1070 sock_put(sk);
1071 }
1072
1073 /*
1074 * Read buffer destructor automatically called from kfree_skb.
1075 */
1076 void sock_rfree(struct sk_buff *skb)
1077 {
1078 struct sock *sk = skb->sk;
1079
1080 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1081 }
1082
1083
1084 int sock_i_uid(struct sock *sk)
1085 {
1086 int uid;
1087
1088 read_lock(&sk->sk_callback_lock);
1089 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1090 read_unlock(&sk->sk_callback_lock);
1091 return uid;
1092 }
1093
1094 unsigned long sock_i_ino(struct sock *sk)
1095 {
1096 unsigned long ino;
1097
1098 read_lock(&sk->sk_callback_lock);
1099 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1100 read_unlock(&sk->sk_callback_lock);
1101 return ino;
1102 }
1103
1104 /*
1105 * Allocate a skb from the socket's send buffer.
1106 */
1107 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1108 gfp_t priority)
1109 {
1110 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1111 struct sk_buff * skb = alloc_skb(size, priority);
1112 if (skb) {
1113 skb_set_owner_w(skb, sk);
1114 return skb;
1115 }
1116 }
1117 return NULL;
1118 }
1119
1120 /*
1121 * Allocate a skb from the socket's receive buffer.
1122 */
1123 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1124 gfp_t priority)
1125 {
1126 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1127 struct sk_buff *skb = alloc_skb(size, priority);
1128 if (skb) {
1129 skb_set_owner_r(skb, sk);
1130 return skb;
1131 }
1132 }
1133 return NULL;
1134 }
1135
1136 /*
1137 * Allocate a memory block from the socket's option memory buffer.
1138 */
1139 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1140 {
1141 if ((unsigned)size <= sysctl_optmem_max &&
1142 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1143 void *mem;
1144 /* First do the add, to avoid the race if kmalloc
1145 * might sleep.
1146 */
1147 atomic_add(size, &sk->sk_omem_alloc);
1148 mem = kmalloc(size, priority);
1149 if (mem)
1150 return mem;
1151 atomic_sub(size, &sk->sk_omem_alloc);
1152 }
1153 return NULL;
1154 }
1155
1156 /*
1157 * Free an option memory block.
1158 */
1159 void sock_kfree_s(struct sock *sk, void *mem, int size)
1160 {
1161 kfree(mem);
1162 atomic_sub(size, &sk->sk_omem_alloc);
1163 }
1164
1165 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1166 I think, these locks should be removed for datagram sockets.
1167 */
1168 static long sock_wait_for_wmem(struct sock * sk, long timeo)
1169 {
1170 DEFINE_WAIT(wait);
1171
1172 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1173 for (;;) {
1174 if (!timeo)
1175 break;
1176 if (signal_pending(current))
1177 break;
1178 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1179 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1180 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1181 break;
1182 if (sk->sk_shutdown & SEND_SHUTDOWN)
1183 break;
1184 if (sk->sk_err)
1185 break;
1186 timeo = schedule_timeout(timeo);
1187 }
1188 finish_wait(sk->sk_sleep, &wait);
1189 return timeo;
1190 }
1191
1192
1193 /*
1194 * Generic send/receive buffer handlers
1195 */
1196
1197 static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1198 unsigned long header_len,
1199 unsigned long data_len,
1200 int noblock, int *errcode)
1201 {
1202 struct sk_buff *skb;
1203 gfp_t gfp_mask;
1204 long timeo;
1205 int err;
1206
1207 gfp_mask = sk->sk_allocation;
1208 if (gfp_mask & __GFP_WAIT)
1209 gfp_mask |= __GFP_REPEAT;
1210
1211 timeo = sock_sndtimeo(sk, noblock);
1212 while (1) {
1213 err = sock_error(sk);
1214 if (err != 0)
1215 goto failure;
1216
1217 err = -EPIPE;
1218 if (sk->sk_shutdown & SEND_SHUTDOWN)
1219 goto failure;
1220
1221 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1222 skb = alloc_skb(header_len, gfp_mask);
1223 if (skb) {
1224 int npages;
1225 int i;
1226
1227 /* No pages, we're done... */
1228 if (!data_len)
1229 break;
1230
1231 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1232 skb->truesize += data_len;
1233 skb_shinfo(skb)->nr_frags = npages;
1234 for (i = 0; i < npages; i++) {
1235 struct page *page;
1236 skb_frag_t *frag;
1237
1238 page = alloc_pages(sk->sk_allocation, 0);
1239 if (!page) {
1240 err = -ENOBUFS;
1241 skb_shinfo(skb)->nr_frags = i;
1242 kfree_skb(skb);
1243 goto failure;
1244 }
1245
1246 frag = &skb_shinfo(skb)->frags[i];
1247 frag->page = page;
1248 frag->page_offset = 0;
1249 frag->size = (data_len >= PAGE_SIZE ?
1250 PAGE_SIZE :
1251 data_len);
1252 data_len -= PAGE_SIZE;
1253 }
1254
1255 /* Full success... */
1256 break;
1257 }
1258 err = -ENOBUFS;
1259 goto failure;
1260 }
1261 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1262 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1263 err = -EAGAIN;
1264 if (!timeo)
1265 goto failure;
1266 if (signal_pending(current))
1267 goto interrupted;
1268 timeo = sock_wait_for_wmem(sk, timeo);
1269 }
1270
1271 skb_set_owner_w(skb, sk);
1272 return skb;
1273
1274 interrupted:
1275 err = sock_intr_errno(timeo);
1276 failure:
1277 *errcode = err;
1278 return NULL;
1279 }
1280
1281 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1282 int noblock, int *errcode)
1283 {
1284 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1285 }
1286
1287 static void __lock_sock(struct sock *sk)
1288 {
1289 DEFINE_WAIT(wait);
1290
1291 for (;;) {
1292 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1293 TASK_UNINTERRUPTIBLE);
1294 spin_unlock_bh(&sk->sk_lock.slock);
1295 schedule();
1296 spin_lock_bh(&sk->sk_lock.slock);
1297 if (!sock_owned_by_user(sk))
1298 break;
1299 }
1300 finish_wait(&sk->sk_lock.wq, &wait);
1301 }
1302
1303 static void __release_sock(struct sock *sk)
1304 {
1305 struct sk_buff *skb = sk->sk_backlog.head;
1306
1307 do {
1308 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1309 bh_unlock_sock(sk);
1310
1311 do {
1312 struct sk_buff *next = skb->next;
1313
1314 skb->next = NULL;
1315 sk->sk_backlog_rcv(sk, skb);
1316
1317 /*
1318 * We are in process context here with softirqs
1319 * disabled, use cond_resched_softirq() to preempt.
1320 * This is safe to do because we've taken the backlog
1321 * queue private:
1322 */
1323 cond_resched_softirq();
1324
1325 skb = next;
1326 } while (skb != NULL);
1327
1328 bh_lock_sock(sk);
1329 } while ((skb = sk->sk_backlog.head) != NULL);
1330 }
1331
1332 /**
1333 * sk_wait_data - wait for data to arrive at sk_receive_queue
1334 * @sk: sock to wait on
1335 * @timeo: for how long
1336 *
1337 * Now socket state including sk->sk_err is changed only under lock,
1338 * hence we may omit checks after joining wait queue.
1339 * We check receive queue before schedule() only as optimization;
1340 * it is very likely that release_sock() added new data.
1341 */
1342 int sk_wait_data(struct sock *sk, long *timeo)
1343 {
1344 int rc;
1345 DEFINE_WAIT(wait);
1346
1347 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1348 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1349 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1350 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1351 finish_wait(sk->sk_sleep, &wait);
1352 return rc;
1353 }
1354
1355 EXPORT_SYMBOL(sk_wait_data);
1356
1357 /*
1358 * Set of default routines for initialising struct proto_ops when
1359 * the protocol does not support a particular function. In certain
1360 * cases where it makes no sense for a protocol to have a "do nothing"
1361 * function, some default processing is provided.
1362 */
1363
1364 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1365 {
1366 return -EOPNOTSUPP;
1367 }
1368
1369 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1370 int len, int flags)
1371 {
1372 return -EOPNOTSUPP;
1373 }
1374
1375 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1376 {
1377 return -EOPNOTSUPP;
1378 }
1379
1380 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1381 {
1382 return -EOPNOTSUPP;
1383 }
1384
1385 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1386 int *len, int peer)
1387 {
1388 return -EOPNOTSUPP;
1389 }
1390
1391 unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1392 {
1393 return 0;
1394 }
1395
1396 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1397 {
1398 return -EOPNOTSUPP;
1399 }
1400
1401 int sock_no_listen(struct socket *sock, int backlog)
1402 {
1403 return -EOPNOTSUPP;
1404 }
1405
1406 int sock_no_shutdown(struct socket *sock, int how)
1407 {
1408 return -EOPNOTSUPP;
1409 }
1410
1411 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1412 char __user *optval, int optlen)
1413 {
1414 return -EOPNOTSUPP;
1415 }
1416
1417 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1418 char __user *optval, int __user *optlen)
1419 {
1420 return -EOPNOTSUPP;
1421 }
1422
1423 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1424 size_t len)
1425 {
1426 return -EOPNOTSUPP;
1427 }
1428
1429 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1430 size_t len, int flags)
1431 {
1432 return -EOPNOTSUPP;
1433 }
1434
1435 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1436 {
1437 /* Mirror missing mmap method error code */
1438 return -ENODEV;
1439 }
1440
1441 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1442 {
1443 ssize_t res;
1444 struct msghdr msg = {.msg_flags = flags};
1445 struct kvec iov;
1446 char *kaddr = kmap(page);
1447 iov.iov_base = kaddr + offset;
1448 iov.iov_len = size;
1449 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1450 kunmap(page);
1451 return res;
1452 }
1453
1454 /*
1455 * Default Socket Callbacks
1456 */
1457
1458 static void sock_def_wakeup(struct sock *sk)
1459 {
1460 read_lock(&sk->sk_callback_lock);
1461 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1462 wake_up_interruptible_all(sk->sk_sleep);
1463 read_unlock(&sk->sk_callback_lock);
1464 }
1465
1466 static void sock_def_error_report(struct sock *sk)
1467 {
1468 read_lock(&sk->sk_callback_lock);
1469 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1470 wake_up_interruptible(sk->sk_sleep);
1471 sk_wake_async(sk,0,POLL_ERR);
1472 read_unlock(&sk->sk_callback_lock);
1473 }
1474
1475 static void sock_def_readable(struct sock *sk, int len)
1476 {
1477 read_lock(&sk->sk_callback_lock);
1478 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1479 wake_up_interruptible(sk->sk_sleep);
1480 sk_wake_async(sk,1,POLL_IN);
1481 read_unlock(&sk->sk_callback_lock);
1482 }
1483
1484 static void sock_def_write_space(struct sock *sk)
1485 {
1486 read_lock(&sk->sk_callback_lock);
1487
1488 /* Do not wake up a writer until he can make "significant"
1489 * progress. --DaveM
1490 */
1491 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1492 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1493 wake_up_interruptible(sk->sk_sleep);
1494
1495 /* Should agree with poll, otherwise some programs break */
1496 if (sock_writeable(sk))
1497 sk_wake_async(sk, 2, POLL_OUT);
1498 }
1499
1500 read_unlock(&sk->sk_callback_lock);
1501 }
1502
1503 static void sock_def_destruct(struct sock *sk)
1504 {
1505 kfree(sk->sk_protinfo);
1506 }
1507
1508 void sk_send_sigurg(struct sock *sk)
1509 {
1510 if (sk->sk_socket && sk->sk_socket->file)
1511 if (send_sigurg(&sk->sk_socket->file->f_owner))
1512 sk_wake_async(sk, 3, POLL_PRI);
1513 }
1514
1515 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1516 unsigned long expires)
1517 {
1518 if (!mod_timer(timer, expires))
1519 sock_hold(sk);
1520 }
1521
1522 EXPORT_SYMBOL(sk_reset_timer);
1523
1524 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1525 {
1526 if (timer_pending(timer) && del_timer(timer))
1527 __sock_put(sk);
1528 }
1529
1530 EXPORT_SYMBOL(sk_stop_timer);
1531
1532 void sock_init_data(struct socket *sock, struct sock *sk)
1533 {
1534 skb_queue_head_init(&sk->sk_receive_queue);
1535 skb_queue_head_init(&sk->sk_write_queue);
1536 skb_queue_head_init(&sk->sk_error_queue);
1537 #ifdef CONFIG_NET_DMA
1538 skb_queue_head_init(&sk->sk_async_wait_queue);
1539 #endif
1540
1541 sk->sk_send_head = NULL;
1542
1543 init_timer(&sk->sk_timer);
1544
1545 sk->sk_allocation = GFP_KERNEL;
1546 sk->sk_rcvbuf = sysctl_rmem_default;
1547 sk->sk_sndbuf = sysctl_wmem_default;
1548 sk->sk_state = TCP_CLOSE;
1549 sk->sk_socket = sock;
1550
1551 sock_set_flag(sk, SOCK_ZAPPED);
1552
1553 if (sock) {
1554 sk->sk_type = sock->type;
1555 sk->sk_sleep = &sock->wait;
1556 sock->sk = sk;
1557 } else
1558 sk->sk_sleep = NULL;
1559
1560 rwlock_init(&sk->sk_dst_lock);
1561 rwlock_init(&sk->sk_callback_lock);
1562 lockdep_set_class_and_name(&sk->sk_callback_lock,
1563 af_callback_keys + sk->sk_family,
1564 af_family_clock_key_strings[sk->sk_family]);
1565
1566 sk->sk_state_change = sock_def_wakeup;
1567 sk->sk_data_ready = sock_def_readable;
1568 sk->sk_write_space = sock_def_write_space;
1569 sk->sk_error_report = sock_def_error_report;
1570 sk->sk_destruct = sock_def_destruct;
1571
1572 sk->sk_sndmsg_page = NULL;
1573 sk->sk_sndmsg_off = 0;
1574
1575 sk->sk_peercred.pid = 0;
1576 sk->sk_peercred.uid = -1;
1577 sk->sk_peercred.gid = -1;
1578 sk->sk_write_pending = 0;
1579 sk->sk_rcvlowat = 1;
1580 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1581 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1582
1583 sk->sk_stamp = ktime_set(-1L, -1L);
1584
1585 atomic_set(&sk->sk_refcnt, 1);
1586 }
1587
1588 void fastcall lock_sock_nested(struct sock *sk, int subclass)
1589 {
1590 might_sleep();
1591 spin_lock_bh(&sk->sk_lock.slock);
1592 if (sk->sk_lock.owned)
1593 __lock_sock(sk);
1594 sk->sk_lock.owned = 1;
1595 spin_unlock(&sk->sk_lock.slock);
1596 /*
1597 * The sk_lock has mutex_lock() semantics here:
1598 */
1599 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
1600 local_bh_enable();
1601 }
1602
1603 EXPORT_SYMBOL(lock_sock_nested);
1604
1605 void fastcall release_sock(struct sock *sk)
1606 {
1607 /*
1608 * The sk_lock has mutex_unlock() semantics:
1609 */
1610 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1611
1612 spin_lock_bh(&sk->sk_lock.slock);
1613 if (sk->sk_backlog.tail)
1614 __release_sock(sk);
1615 sk->sk_lock.owned = 0;
1616 if (waitqueue_active(&sk->sk_lock.wq))
1617 wake_up(&sk->sk_lock.wq);
1618 spin_unlock_bh(&sk->sk_lock.slock);
1619 }
1620 EXPORT_SYMBOL(release_sock);
1621
1622 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
1623 {
1624 struct timeval tv;
1625 if (!sock_flag(sk, SOCK_TIMESTAMP))
1626 sock_enable_timestamp(sk);
1627 tv = ktime_to_timeval(sk->sk_stamp);
1628 if (tv.tv_sec == -1)
1629 return -ENOENT;
1630 if (tv.tv_sec == 0) {
1631 sk->sk_stamp = ktime_get_real();
1632 tv = ktime_to_timeval(sk->sk_stamp);
1633 }
1634 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
1635 }
1636 EXPORT_SYMBOL(sock_get_timestamp);
1637
1638 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1639 {
1640 struct timespec ts;
1641 if (!sock_flag(sk, SOCK_TIMESTAMP))
1642 sock_enable_timestamp(sk);
1643 ts = ktime_to_timespec(sk->sk_stamp);
1644 if (ts.tv_sec == -1)
1645 return -ENOENT;
1646 if (ts.tv_sec == 0) {
1647 sk->sk_stamp = ktime_get_real();
1648 ts = ktime_to_timespec(sk->sk_stamp);
1649 }
1650 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1651 }
1652 EXPORT_SYMBOL(sock_get_timestampns);
1653
1654 void sock_enable_timestamp(struct sock *sk)
1655 {
1656 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1657 sock_set_flag(sk, SOCK_TIMESTAMP);
1658 net_enable_timestamp();
1659 }
1660 }
1661 EXPORT_SYMBOL(sock_enable_timestamp);
1662
1663 /*
1664 * Get a socket option on an socket.
1665 *
1666 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1667 * asynchronous errors should be reported by getsockopt. We assume
1668 * this means if you specify SO_ERROR (otherwise whats the point of it).
1669 */
1670 int sock_common_getsockopt(struct socket *sock, int level, int optname,
1671 char __user *optval, int __user *optlen)
1672 {
1673 struct sock *sk = sock->sk;
1674
1675 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1676 }
1677
1678 EXPORT_SYMBOL(sock_common_getsockopt);
1679
1680 #ifdef CONFIG_COMPAT
1681 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1682 char __user *optval, int __user *optlen)
1683 {
1684 struct sock *sk = sock->sk;
1685
1686 if (sk->sk_prot->compat_getsockopt != NULL)
1687 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1688 optval, optlen);
1689 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1690 }
1691 EXPORT_SYMBOL(compat_sock_common_getsockopt);
1692 #endif
1693
1694 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1695 struct msghdr *msg, size_t size, int flags)
1696 {
1697 struct sock *sk = sock->sk;
1698 int addr_len = 0;
1699 int err;
1700
1701 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1702 flags & ~MSG_DONTWAIT, &addr_len);
1703 if (err >= 0)
1704 msg->msg_namelen = addr_len;
1705 return err;
1706 }
1707
1708 EXPORT_SYMBOL(sock_common_recvmsg);
1709
1710 /*
1711 * Set socket options on an inet socket.
1712 */
1713 int sock_common_setsockopt(struct socket *sock, int level, int optname,
1714 char __user *optval, int optlen)
1715 {
1716 struct sock *sk = sock->sk;
1717
1718 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1719 }
1720
1721 EXPORT_SYMBOL(sock_common_setsockopt);
1722
1723 #ifdef CONFIG_COMPAT
1724 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1725 char __user *optval, int optlen)
1726 {
1727 struct sock *sk = sock->sk;
1728
1729 if (sk->sk_prot->compat_setsockopt != NULL)
1730 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1731 optval, optlen);
1732 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1733 }
1734 EXPORT_SYMBOL(compat_sock_common_setsockopt);
1735 #endif
1736
1737 void sk_common_release(struct sock *sk)
1738 {
1739 if (sk->sk_prot->destroy)
1740 sk->sk_prot->destroy(sk);
1741
1742 /*
1743 * Observation: when sock_common_release is called, processes have
1744 * no access to socket. But net still has.
1745 * Step one, detach it from networking:
1746 *
1747 * A. Remove from hash tables.
1748 */
1749
1750 sk->sk_prot->unhash(sk);
1751
1752 /*
1753 * In this point socket cannot receive new packets, but it is possible
1754 * that some packets are in flight because some CPU runs receiver and
1755 * did hash table lookup before we unhashed socket. They will achieve
1756 * receive queue and will be purged by socket destructor.
1757 *
1758 * Also we still have packets pending on receive queue and probably,
1759 * our own packets waiting in device queues. sock_destroy will drain
1760 * receive queue, but transmitted packets will delay socket destruction
1761 * until the last reference will be released.
1762 */
1763
1764 sock_orphan(sk);
1765
1766 xfrm_sk_free_policy(sk);
1767
1768 sk_refcnt_debug_release(sk);
1769 sock_put(sk);
1770 }
1771
1772 EXPORT_SYMBOL(sk_common_release);
1773
1774 static DEFINE_RWLOCK(proto_list_lock);
1775 static LIST_HEAD(proto_list);
1776
1777 int proto_register(struct proto *prot, int alloc_slab)
1778 {
1779 char *request_sock_slab_name = NULL;
1780 char *timewait_sock_slab_name;
1781 int rc = -ENOBUFS;
1782
1783 if (alloc_slab) {
1784 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
1785 SLAB_HWCACHE_ALIGN, NULL);
1786
1787 if (prot->slab == NULL) {
1788 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
1789 prot->name);
1790 goto out;
1791 }
1792
1793 if (prot->rsk_prot != NULL) {
1794 static const char mask[] = "request_sock_%s";
1795
1796 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1797 if (request_sock_slab_name == NULL)
1798 goto out_free_sock_slab;
1799
1800 sprintf(request_sock_slab_name, mask, prot->name);
1801 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
1802 prot->rsk_prot->obj_size, 0,
1803 SLAB_HWCACHE_ALIGN, NULL);
1804
1805 if (prot->rsk_prot->slab == NULL) {
1806 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
1807 prot->name);
1808 goto out_free_request_sock_slab_name;
1809 }
1810 }
1811
1812 if (prot->twsk_prot != NULL) {
1813 static const char mask[] = "tw_sock_%s";
1814
1815 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1816
1817 if (timewait_sock_slab_name == NULL)
1818 goto out_free_request_sock_slab;
1819
1820 sprintf(timewait_sock_slab_name, mask, prot->name);
1821 prot->twsk_prot->twsk_slab =
1822 kmem_cache_create(timewait_sock_slab_name,
1823 prot->twsk_prot->twsk_obj_size,
1824 0, SLAB_HWCACHE_ALIGN,
1825 NULL);
1826 if (prot->twsk_prot->twsk_slab == NULL)
1827 goto out_free_timewait_sock_slab_name;
1828 }
1829 }
1830
1831 write_lock(&proto_list_lock);
1832 list_add(&prot->node, &proto_list);
1833 write_unlock(&proto_list_lock);
1834 rc = 0;
1835 out:
1836 return rc;
1837 out_free_timewait_sock_slab_name:
1838 kfree(timewait_sock_slab_name);
1839 out_free_request_sock_slab:
1840 if (prot->rsk_prot && prot->rsk_prot->slab) {
1841 kmem_cache_destroy(prot->rsk_prot->slab);
1842 prot->rsk_prot->slab = NULL;
1843 }
1844 out_free_request_sock_slab_name:
1845 kfree(request_sock_slab_name);
1846 out_free_sock_slab:
1847 kmem_cache_destroy(prot->slab);
1848 prot->slab = NULL;
1849 goto out;
1850 }
1851
1852 EXPORT_SYMBOL(proto_register);
1853
1854 void proto_unregister(struct proto *prot)
1855 {
1856 write_lock(&proto_list_lock);
1857 list_del(&prot->node);
1858 write_unlock(&proto_list_lock);
1859
1860 if (prot->slab != NULL) {
1861 kmem_cache_destroy(prot->slab);
1862 prot->slab = NULL;
1863 }
1864
1865 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
1866 const char *name = kmem_cache_name(prot->rsk_prot->slab);
1867
1868 kmem_cache_destroy(prot->rsk_prot->slab);
1869 kfree(name);
1870 prot->rsk_prot->slab = NULL;
1871 }
1872
1873 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
1874 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
1875
1876 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
1877 kfree(name);
1878 prot->twsk_prot->twsk_slab = NULL;
1879 }
1880 }
1881
1882 EXPORT_SYMBOL(proto_unregister);
1883
1884 #ifdef CONFIG_PROC_FS
1885 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
1886 {
1887 read_lock(&proto_list_lock);
1888 return seq_list_start_head(&proto_list, *pos);
1889 }
1890
1891 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1892 {
1893 return seq_list_next(v, &proto_list, pos);
1894 }
1895
1896 static void proto_seq_stop(struct seq_file *seq, void *v)
1897 {
1898 read_unlock(&proto_list_lock);
1899 }
1900
1901 static char proto_method_implemented(const void *method)
1902 {
1903 return method == NULL ? 'n' : 'y';
1904 }
1905
1906 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
1907 {
1908 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
1909 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
1910 proto->name,
1911 proto->obj_size,
1912 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
1913 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
1914 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
1915 proto->max_header,
1916 proto->slab == NULL ? "no" : "yes",
1917 module_name(proto->owner),
1918 proto_method_implemented(proto->close),
1919 proto_method_implemented(proto->connect),
1920 proto_method_implemented(proto->disconnect),
1921 proto_method_implemented(proto->accept),
1922 proto_method_implemented(proto->ioctl),
1923 proto_method_implemented(proto->init),
1924 proto_method_implemented(proto->destroy),
1925 proto_method_implemented(proto->shutdown),
1926 proto_method_implemented(proto->setsockopt),
1927 proto_method_implemented(proto->getsockopt),
1928 proto_method_implemented(proto->sendmsg),
1929 proto_method_implemented(proto->recvmsg),
1930 proto_method_implemented(proto->sendpage),
1931 proto_method_implemented(proto->bind),
1932 proto_method_implemented(proto->backlog_rcv),
1933 proto_method_implemented(proto->hash),
1934 proto_method_implemented(proto->unhash),
1935 proto_method_implemented(proto->get_port),
1936 proto_method_implemented(proto->enter_memory_pressure));
1937 }
1938
1939 static int proto_seq_show(struct seq_file *seq, void *v)
1940 {
1941 if (v == &proto_list)
1942 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
1943 "protocol",
1944 "size",
1945 "sockets",
1946 "memory",
1947 "press",
1948 "maxhdr",
1949 "slab",
1950 "module",
1951 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
1952 else
1953 proto_seq_printf(seq, list_entry(v, struct proto, node));
1954 return 0;
1955 }
1956
1957 static const struct seq_operations proto_seq_ops = {
1958 .start = proto_seq_start,
1959 .next = proto_seq_next,
1960 .stop = proto_seq_stop,
1961 .show = proto_seq_show,
1962 };
1963
1964 static int proto_seq_open(struct inode *inode, struct file *file)
1965 {
1966 return seq_open(file, &proto_seq_ops);
1967 }
1968
1969 static const struct file_operations proto_seq_fops = {
1970 .owner = THIS_MODULE,
1971 .open = proto_seq_open,
1972 .read = seq_read,
1973 .llseek = seq_lseek,
1974 .release = seq_release,
1975 };
1976
1977 static int __init proto_init(void)
1978 {
1979 /* register /proc/net/protocols */
1980 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
1981 }
1982
1983 subsys_initcall(proto_init);
1984
1985 #endif /* PROC_FS */
1986
1987 EXPORT_SYMBOL(sk_alloc);
1988 EXPORT_SYMBOL(sk_free);
1989 EXPORT_SYMBOL(sk_send_sigurg);
1990 EXPORT_SYMBOL(sock_alloc_send_skb);
1991 EXPORT_SYMBOL(sock_init_data);
1992 EXPORT_SYMBOL(sock_kfree_s);
1993 EXPORT_SYMBOL(sock_kmalloc);
1994 EXPORT_SYMBOL(sock_no_accept);
1995 EXPORT_SYMBOL(sock_no_bind);
1996 EXPORT_SYMBOL(sock_no_connect);
1997 EXPORT_SYMBOL(sock_no_getname);
1998 EXPORT_SYMBOL(sock_no_getsockopt);
1999 EXPORT_SYMBOL(sock_no_ioctl);
2000 EXPORT_SYMBOL(sock_no_listen);
2001 EXPORT_SYMBOL(sock_no_mmap);
2002 EXPORT_SYMBOL(sock_no_poll);
2003 EXPORT_SYMBOL(sock_no_recvmsg);
2004 EXPORT_SYMBOL(sock_no_sendmsg);
2005 EXPORT_SYMBOL(sock_no_sendpage);
2006 EXPORT_SYMBOL(sock_no_setsockopt);
2007 EXPORT_SYMBOL(sock_no_shutdown);
2008 EXPORT_SYMBOL(sock_no_socketpair);
2009 EXPORT_SYMBOL(sock_rfree);
2010 EXPORT_SYMBOL(sock_setsockopt);
2011 EXPORT_SYMBOL(sock_wfree);
2012 EXPORT_SYMBOL(sock_wmalloc);
2013 EXPORT_SYMBOL(sock_i_uid);
2014 EXPORT_SYMBOL(sock_i_ino);
2015 EXPORT_SYMBOL(sysctl_optmem_max);
2016 #ifdef CONFIG_SYSCTL
2017 EXPORT_SYMBOL(sysctl_rmem_max);
2018 EXPORT_SYMBOL(sysctl_wmem_max);
2019 #endif
x86 "subsystem" repository