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[MEDIA] IVTV: exit_ivtv_i2c() cannot be __devexit
[linux-2.6/verdex.git] / net / core / sock.c
blobbba9949681ff7e132f84629602814dc7d9aa17d4
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, task_pid_nr(current));
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 int val;
432 int valbool;
433 struct linger ling;
434 int ret = 0;
435
436 /*
437 * Options without arguments
438 */
439
440 #ifdef SO_DONTLINGER /* Compatibility item... */
441 if (optname == SO_DONTLINGER) {
442 lock_sock(sk);
443 sock_reset_flag(sk, SOCK_LINGER);
444 release_sock(sk);
445 return 0;
446 }
447 #endif
448
449 if (optname == SO_BINDTODEVICE)
450 return sock_bindtodevice(sk, optval, optlen);
451
452 if (optlen < sizeof(int))
453 return -EINVAL;
454
455 if (get_user(val, (int __user *)optval))
456 return -EFAULT;
457
458 valbool = val?1:0;
459
460 lock_sock(sk);
461
462 switch(optname) {
463 case SO_DEBUG:
464 if (val && !capable(CAP_NET_ADMIN)) {
465 ret = -EACCES;
466 }
467 else if (valbool)
468 sock_set_flag(sk, SOCK_DBG);
469 else
470 sock_reset_flag(sk, SOCK_DBG);
471 break;
472 case SO_REUSEADDR:
473 sk->sk_reuse = valbool;
474 break;
475 case SO_TYPE:
476 case SO_ERROR:
477 ret = -ENOPROTOOPT;
478 break;
479 case SO_DONTROUTE:
480 if (valbool)
481 sock_set_flag(sk, SOCK_LOCALROUTE);
482 else
483 sock_reset_flag(sk, SOCK_LOCALROUTE);
484 break;
485 case SO_BROADCAST:
486 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
487 break;
488 case SO_SNDBUF:
489 /* Don't error on this BSD doesn't and if you think
490 about it this is right. Otherwise apps have to
491 play 'guess the biggest size' games. RCVBUF/SNDBUF
492 are treated in BSD as hints */
493
494 if (val > sysctl_wmem_max)
495 val = sysctl_wmem_max;
496 set_sndbuf:
497 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
498 if ((val * 2) < SOCK_MIN_SNDBUF)
499 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
500 else
501 sk->sk_sndbuf = val * 2;
502
503 /*
504 * Wake up sending tasks if we
505 * upped the value.
506 */
507 sk->sk_write_space(sk);
508 break;
509
510 case SO_SNDBUFFORCE:
511 if (!capable(CAP_NET_ADMIN)) {
512 ret = -EPERM;
513 break;
514 }
515 goto set_sndbuf;
516
517 case SO_RCVBUF:
518 /* Don't error on this BSD doesn't and if you think
519 about it this is right. Otherwise apps have to
520 play 'guess the biggest size' games. RCVBUF/SNDBUF
521 are treated in BSD as hints */
522
523 if (val > sysctl_rmem_max)
524 val = sysctl_rmem_max;
525 set_rcvbuf:
526 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
527 /*
528 * We double it on the way in to account for
529 * "struct sk_buff" etc. overhead. Applications
530 * assume that the SO_RCVBUF setting they make will
531 * allow that much actual data to be received on that
532 * socket.
533 *
534 * Applications are unaware that "struct sk_buff" and
535 * other overheads allocate from the receive buffer
536 * during socket buffer allocation.
537 *
538 * And after considering the possible alternatives,
539 * returning the value we actually used in getsockopt
540 * is the most desirable behavior.
541 */
542 if ((val * 2) < SOCK_MIN_RCVBUF)
543 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
544 else
545 sk->sk_rcvbuf = val * 2;
546 break;
547
548 case SO_RCVBUFFORCE:
549 if (!capable(CAP_NET_ADMIN)) {
550 ret = -EPERM;
551 break;
552 }
553 goto set_rcvbuf;
554
555 case SO_KEEPALIVE:
556 #ifdef CONFIG_INET
557 if (sk->sk_protocol == IPPROTO_TCP)
558 tcp_set_keepalive(sk, valbool);
559 #endif
560 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
561 break;
562
563 case SO_OOBINLINE:
564 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
565 break;
566
567 case SO_NO_CHECK:
568 sk->sk_no_check = valbool;
569 break;
570
571 case SO_PRIORITY:
572 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
573 sk->sk_priority = val;
574 else
575 ret = -EPERM;
576 break;
577
578 case SO_LINGER:
579 if (optlen < sizeof(ling)) {
580 ret = -EINVAL; /* 1003.1g */
581 break;
582 }
583 if (copy_from_user(&ling,optval,sizeof(ling))) {
584 ret = -EFAULT;
585 break;
586 }
587 if (!ling.l_onoff)
588 sock_reset_flag(sk, SOCK_LINGER);
589 else {
590 #if (BITS_PER_LONG == 32)
591 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
592 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
593 else
594 #endif
595 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
596 sock_set_flag(sk, SOCK_LINGER);
597 }
598 break;
599
600 case SO_BSDCOMPAT:
601 sock_warn_obsolete_bsdism("setsockopt");
602 break;
603
604 case SO_PASSCRED:
605 if (valbool)
606 set_bit(SOCK_PASSCRED, &sock->flags);
607 else
608 clear_bit(SOCK_PASSCRED, &sock->flags);
609 break;
610
611 case SO_TIMESTAMP:
612 case SO_TIMESTAMPNS:
613 if (valbool) {
614 if (optname == SO_TIMESTAMP)
615 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
616 else
617 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
618 sock_set_flag(sk, SOCK_RCVTSTAMP);
619 sock_enable_timestamp(sk);
620 } else {
621 sock_reset_flag(sk, SOCK_RCVTSTAMP);
622 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
623 }
624 break;
625
626 case SO_RCVLOWAT:
627 if (val < 0)
628 val = INT_MAX;
629 sk->sk_rcvlowat = val ? : 1;
630 break;
631
632 case SO_RCVTIMEO:
633 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
634 break;
635
636 case SO_SNDTIMEO:
637 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
638 break;
639
640 case SO_ATTACH_FILTER:
641 ret = -EINVAL;
642 if (optlen == sizeof(struct sock_fprog)) {
643 struct sock_fprog fprog;
644
645 ret = -EFAULT;
646 if (copy_from_user(&fprog, optval, sizeof(fprog)))
647 break;
648
649 ret = sk_attach_filter(&fprog, sk);
650 }
651 break;
652
653 case SO_DETACH_FILTER:
654 ret = sk_detach_filter(sk);
655 break;
656
657 case SO_PASSSEC:
658 if (valbool)
659 set_bit(SOCK_PASSSEC, &sock->flags);
660 else
661 clear_bit(SOCK_PASSSEC, &sock->flags);
662 break;
663
664 /* We implement the SO_SNDLOWAT etc to
665 not be settable (1003.1g 5.3) */
666 default:
667 ret = -ENOPROTOOPT;
668 break;
669 }
670 release_sock(sk);
671 return ret;
672 }
673
674
675 int sock_getsockopt(struct socket *sock, int level, int optname,
676 char __user *optval, int __user *optlen)
677 {
678 struct sock *sk = sock->sk;
679
680 union {
681 int val;
682 struct linger ling;
683 struct timeval tm;
684 } v;
685
686 unsigned int lv = sizeof(int);
687 int len;
688
689 if (get_user(len, optlen))
690 return -EFAULT;
691 if (len < 0)
692 return -EINVAL;
693
694 switch(optname) {
695 case SO_DEBUG:
696 v.val = sock_flag(sk, SOCK_DBG);
697 break;
698
699 case SO_DONTROUTE:
700 v.val = sock_flag(sk, SOCK_LOCALROUTE);
701 break;
702
703 case SO_BROADCAST:
704 v.val = !!sock_flag(sk, SOCK_BROADCAST);
705 break;
706
707 case SO_SNDBUF:
708 v.val = sk->sk_sndbuf;
709 break;
710
711 case SO_RCVBUF:
712 v.val = sk->sk_rcvbuf;
713 break;
714
715 case SO_REUSEADDR:
716 v.val = sk->sk_reuse;
717 break;
718
719 case SO_KEEPALIVE:
720 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
721 break;
722
723 case SO_TYPE:
724 v.val = sk->sk_type;
725 break;
726
727 case SO_ERROR:
728 v.val = -sock_error(sk);
729 if (v.val==0)
730 v.val = xchg(&sk->sk_err_soft, 0);
731 break;
732
733 case SO_OOBINLINE:
734 v.val = !!sock_flag(sk, SOCK_URGINLINE);
735 break;
736
737 case SO_NO_CHECK:
738 v.val = sk->sk_no_check;
739 break;
740
741 case SO_PRIORITY:
742 v.val = sk->sk_priority;
743 break;
744
745 case SO_LINGER:
746 lv = sizeof(v.ling);
747 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
748 v.ling.l_linger = sk->sk_lingertime / HZ;
749 break;
750
751 case SO_BSDCOMPAT:
752 sock_warn_obsolete_bsdism("getsockopt");
753 break;
754
755 case SO_TIMESTAMP:
756 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
757 !sock_flag(sk, SOCK_RCVTSTAMPNS);
758 break;
759
760 case SO_TIMESTAMPNS:
761 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
762 break;
763
764 case SO_RCVTIMEO:
765 lv=sizeof(struct timeval);
766 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
767 v.tm.tv_sec = 0;
768 v.tm.tv_usec = 0;
769 } else {
770 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
771 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
772 }
773 break;
774
775 case SO_SNDTIMEO:
776 lv=sizeof(struct timeval);
777 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
778 v.tm.tv_sec = 0;
779 v.tm.tv_usec = 0;
780 } else {
781 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
782 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
783 }
784 break;
785
786 case SO_RCVLOWAT:
787 v.val = sk->sk_rcvlowat;
788 break;
789
790 case SO_SNDLOWAT:
791 v.val=1;
792 break;
793
794 case SO_PASSCRED:
795 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
796 break;
797
798 case SO_PEERCRED:
799 if (len > sizeof(sk->sk_peercred))
800 len = sizeof(sk->sk_peercred);
801 if (copy_to_user(optval, &sk->sk_peercred, len))
802 return -EFAULT;
803 goto lenout;
804
805 case SO_PEERNAME:
806 {
807 char address[128];
808
809 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
810 return -ENOTCONN;
811 if (lv < len)
812 return -EINVAL;
813 if (copy_to_user(optval, address, len))
814 return -EFAULT;
815 goto lenout;
816 }
817
818 /* Dubious BSD thing... Probably nobody even uses it, but
819 * the UNIX standard wants it for whatever reason... -DaveM
820 */
821 case SO_ACCEPTCONN:
822 v.val = sk->sk_state == TCP_LISTEN;
823 break;
824
825 case SO_PASSSEC:
826 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
827 break;
828
829 case SO_PEERSEC:
830 return security_socket_getpeersec_stream(sock, optval, optlen, len);
831
832 default:
833 return -ENOPROTOOPT;
834 }
835
836 if (len > lv)
837 len = lv;
838 if (copy_to_user(optval, &v, len))
839 return -EFAULT;
840 lenout:
841 if (put_user(len, optlen))
842 return -EFAULT;
843 return 0;
844 }
845
846 /*
847 * Initialize an sk_lock.
848 *
849 * (We also register the sk_lock with the lock validator.)
850 */
851 static inline void sock_lock_init(struct sock *sk)
852 {
853 sock_lock_init_class_and_name(sk,
854 af_family_slock_key_strings[sk->sk_family],
855 af_family_slock_keys + sk->sk_family,
856 af_family_key_strings[sk->sk_family],
857 af_family_keys + sk->sk_family);
858 }
859
860 /**
861 * sk_alloc - All socket objects are allocated here
862 * @net: the applicable net namespace
863 * @family: protocol family
864 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
865 * @prot: struct proto associated with this new sock instance
866 * @zero_it: if we should zero the newly allocated sock
867 */
868 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
869 struct proto *prot, int zero_it)
870 {
871 struct sock *sk = NULL;
872 struct kmem_cache *slab = prot->slab;
873
874 if (slab != NULL)
875 sk = kmem_cache_alloc(slab, priority);
876 else
877 sk = kmalloc(prot->obj_size, priority);
878
879 if (sk) {
880 if (zero_it) {
881 memset(sk, 0, prot->obj_size);
882 sk->sk_family = family;
883 /*
884 * See comment in struct sock definition to understand
885 * why we need sk_prot_creator -acme
886 */
887 sk->sk_prot = sk->sk_prot_creator = prot;
888 sock_lock_init(sk);
889 sk->sk_net = get_net(net);
890 }
891
892 if (security_sk_alloc(sk, family, priority))
893 goto out_free;
894
895 if (!try_module_get(prot->owner))
896 goto out_free;
897 }
898 return sk;
899
900 out_free:
901 if (slab != NULL)
902 kmem_cache_free(slab, sk);
903 else
904 kfree(sk);
905 return NULL;
906 }
907
908 void sk_free(struct sock *sk)
909 {
910 struct sk_filter *filter;
911 struct module *owner = sk->sk_prot_creator->owner;
912
913 if (sk->sk_destruct)
914 sk->sk_destruct(sk);
915
916 filter = rcu_dereference(sk->sk_filter);
917 if (filter) {
918 sk_filter_uncharge(sk, filter);
919 rcu_assign_pointer(sk->sk_filter, NULL);
920 }
921
922 sock_disable_timestamp(sk);
923
924 if (atomic_read(&sk->sk_omem_alloc))
925 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
926 __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
927
928 security_sk_free(sk);
929 put_net(sk->sk_net);
930 if (sk->sk_prot_creator->slab != NULL)
931 kmem_cache_free(sk->sk_prot_creator->slab, sk);
932 else
933 kfree(sk);
934 module_put(owner);
935 }
936
937 struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
938 {
939 struct sock *newsk = sk_alloc(sk->sk_net, sk->sk_family, priority, sk->sk_prot, 0);
940
941 if (newsk != NULL) {
942 struct sk_filter *filter;
943
944 sock_copy(newsk, sk);
945
946 /* SANITY */
947 sk_node_init(&newsk->sk_node);
948 sock_lock_init(newsk);
949 bh_lock_sock(newsk);
950 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
951
952 atomic_set(&newsk->sk_rmem_alloc, 0);
953 atomic_set(&newsk->sk_wmem_alloc, 0);
954 atomic_set(&newsk->sk_omem_alloc, 0);
955 skb_queue_head_init(&newsk->sk_receive_queue);
956 skb_queue_head_init(&newsk->sk_write_queue);
957 #ifdef CONFIG_NET_DMA
958 skb_queue_head_init(&newsk->sk_async_wait_queue);
959 #endif
960
961 rwlock_init(&newsk->sk_dst_lock);
962 rwlock_init(&newsk->sk_callback_lock);
963 lockdep_set_class_and_name(&newsk->sk_callback_lock,
964 af_callback_keys + newsk->sk_family,
965 af_family_clock_key_strings[newsk->sk_family]);
966
967 newsk->sk_dst_cache = NULL;
968 newsk->sk_wmem_queued = 0;
969 newsk->sk_forward_alloc = 0;
970 newsk->sk_send_head = NULL;
971 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
972
973 sock_reset_flag(newsk, SOCK_DONE);
974 skb_queue_head_init(&newsk->sk_error_queue);
975
976 filter = newsk->sk_filter;
977 if (filter != NULL)
978 sk_filter_charge(newsk, filter);
979
980 if (unlikely(xfrm_sk_clone_policy(newsk))) {
981 /* It is still raw copy of parent, so invalidate
982 * destructor and make plain sk_free() */
983 newsk->sk_destruct = NULL;
984 sk_free(newsk);
985 newsk = NULL;
986 goto out;
987 }
988
989 newsk->sk_err = 0;
990 newsk->sk_priority = 0;
991 atomic_set(&newsk->sk_refcnt, 2);
992
993 /*
994 * Increment the counter in the same struct proto as the master
995 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
996 * is the same as sk->sk_prot->socks, as this field was copied
997 * with memcpy).
998 *
999 * This _changes_ the previous behaviour, where
1000 * tcp_create_openreq_child always was incrementing the
1001 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1002 * to be taken into account in all callers. -acme
1003 */
1004 sk_refcnt_debug_inc(newsk);
1005 newsk->sk_socket = NULL;
1006 newsk->sk_sleep = NULL;
1007
1008 if (newsk->sk_prot->sockets_allocated)
1009 atomic_inc(newsk->sk_prot->sockets_allocated);
1010 }
1011 out:
1012 return newsk;
1013 }
1014
1015 EXPORT_SYMBOL_GPL(sk_clone);
1016
1017 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1018 {
1019 __sk_dst_set(sk, dst);
1020 sk->sk_route_caps = dst->dev->features;
1021 if (sk->sk_route_caps & NETIF_F_GSO)
1022 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1023 if (sk_can_gso(sk)) {
1024 if (dst->header_len)
1025 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1026 else
1027 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1028 }
1029 }
1030 EXPORT_SYMBOL_GPL(sk_setup_caps);
1031
1032 void __init sk_init(void)
1033 {
1034 if (num_physpages <= 4096) {
1035 sysctl_wmem_max = 32767;
1036 sysctl_rmem_max = 32767;
1037 sysctl_wmem_default = 32767;
1038 sysctl_rmem_default = 32767;
1039 } else if (num_physpages >= 131072) {
1040 sysctl_wmem_max = 131071;
1041 sysctl_rmem_max = 131071;
1042 }
1043 }
1044
1045 /*
1046 * Simple resource managers for sockets.
1047 */
1048
1049
1050 /*
1051 * Write buffer destructor automatically called from kfree_skb.
1052 */
1053 void sock_wfree(struct sk_buff *skb)
1054 {
1055 struct sock *sk = skb->sk;
1056
1057 /* In case it might be waiting for more memory. */
1058 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1059 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1060 sk->sk_write_space(sk);
1061 sock_put(sk);
1062 }
1063
1064 /*
1065 * Read buffer destructor automatically called from kfree_skb.
1066 */
1067 void sock_rfree(struct sk_buff *skb)
1068 {
1069 struct sock *sk = skb->sk;
1070
1071 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1072 }
1073
1074
1075 int sock_i_uid(struct sock *sk)
1076 {
1077 int uid;
1078
1079 read_lock(&sk->sk_callback_lock);
1080 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1081 read_unlock(&sk->sk_callback_lock);
1082 return uid;
1083 }
1084
1085 unsigned long sock_i_ino(struct sock *sk)
1086 {
1087 unsigned long ino;
1088
1089 read_lock(&sk->sk_callback_lock);
1090 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1091 read_unlock(&sk->sk_callback_lock);
1092 return ino;
1093 }
1094
1095 /*
1096 * Allocate a skb from the socket's send buffer.
1097 */
1098 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1099 gfp_t priority)
1100 {
1101 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1102 struct sk_buff * skb = alloc_skb(size, priority);
1103 if (skb) {
1104 skb_set_owner_w(skb, sk);
1105 return skb;
1106 }
1107 }
1108 return NULL;
1109 }
1110
1111 /*
1112 * Allocate a skb from the socket's receive buffer.
1113 */
1114 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1115 gfp_t priority)
1116 {
1117 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1118 struct sk_buff *skb = alloc_skb(size, priority);
1119 if (skb) {
1120 skb_set_owner_r(skb, sk);
1121 return skb;
1122 }
1123 }
1124 return NULL;
1125 }
1126
1127 /*
1128 * Allocate a memory block from the socket's option memory buffer.
1129 */
1130 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1131 {
1132 if ((unsigned)size <= sysctl_optmem_max &&
1133 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1134 void *mem;
1135 /* First do the add, to avoid the race if kmalloc
1136 * might sleep.
1137 */
1138 atomic_add(size, &sk->sk_omem_alloc);
1139 mem = kmalloc(size, priority);
1140 if (mem)
1141 return mem;
1142 atomic_sub(size, &sk->sk_omem_alloc);
1143 }
1144 return NULL;
1145 }
1146
1147 /*
1148 * Free an option memory block.
1149 */
1150 void sock_kfree_s(struct sock *sk, void *mem, int size)
1151 {
1152 kfree(mem);
1153 atomic_sub(size, &sk->sk_omem_alloc);
1154 }
1155
1156 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1157 I think, these locks should be removed for datagram sockets.
1158 */
1159 static long sock_wait_for_wmem(struct sock * sk, long timeo)
1160 {
1161 DEFINE_WAIT(wait);
1162
1163 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1164 for (;;) {
1165 if (!timeo)
1166 break;
1167 if (signal_pending(current))
1168 break;
1169 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1170 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1171 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1172 break;
1173 if (sk->sk_shutdown & SEND_SHUTDOWN)
1174 break;
1175 if (sk->sk_err)
1176 break;
1177 timeo = schedule_timeout(timeo);
1178 }
1179 finish_wait(sk->sk_sleep, &wait);
1180 return timeo;
1181 }
1182
1183
1184 /*
1185 * Generic send/receive buffer handlers
1186 */
1187
1188 static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1189 unsigned long header_len,
1190 unsigned long data_len,
1191 int noblock, int *errcode)
1192 {
1193 struct sk_buff *skb;
1194 gfp_t gfp_mask;
1195 long timeo;
1196 int err;
1197
1198 gfp_mask = sk->sk_allocation;
1199 if (gfp_mask & __GFP_WAIT)
1200 gfp_mask |= __GFP_REPEAT;
1201
1202 timeo = sock_sndtimeo(sk, noblock);
1203 while (1) {
1204 err = sock_error(sk);
1205 if (err != 0)
1206 goto failure;
1207
1208 err = -EPIPE;
1209 if (sk->sk_shutdown & SEND_SHUTDOWN)
1210 goto failure;
1211
1212 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1213 skb = alloc_skb(header_len, gfp_mask);
1214 if (skb) {
1215 int npages;
1216 int i;
1217
1218 /* No pages, we're done... */
1219 if (!data_len)
1220 break;
1221
1222 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1223 skb->truesize += data_len;
1224 skb_shinfo(skb)->nr_frags = npages;
1225 for (i = 0; i < npages; i++) {
1226 struct page *page;
1227 skb_frag_t *frag;
1228
1229 page = alloc_pages(sk->sk_allocation, 0);
1230 if (!page) {
1231 err = -ENOBUFS;
1232 skb_shinfo(skb)->nr_frags = i;
1233 kfree_skb(skb);
1234 goto failure;
1235 }
1236
1237 frag = &skb_shinfo(skb)->frags[i];
1238 frag->page = page;
1239 frag->page_offset = 0;
1240 frag->size = (data_len >= PAGE_SIZE ?
1241 PAGE_SIZE :
1242 data_len);
1243 data_len -= PAGE_SIZE;
1244 }
1245
1246 /* Full success... */
1247 break;
1248 }
1249 err = -ENOBUFS;
1250 goto failure;
1251 }
1252 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1253 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1254 err = -EAGAIN;
1255 if (!timeo)
1256 goto failure;
1257 if (signal_pending(current))
1258 goto interrupted;
1259 timeo = sock_wait_for_wmem(sk, timeo);
1260 }
1261
1262 skb_set_owner_w(skb, sk);
1263 return skb;
1264
1265 interrupted:
1266 err = sock_intr_errno(timeo);
1267 failure:
1268 *errcode = err;
1269 return NULL;
1270 }
1271
1272 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1273 int noblock, int *errcode)
1274 {
1275 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1276 }
1277
1278 static void __lock_sock(struct sock *sk)
1279 {
1280 DEFINE_WAIT(wait);
1281
1282 for (;;) {
1283 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1284 TASK_UNINTERRUPTIBLE);
1285 spin_unlock_bh(&sk->sk_lock.slock);
1286 schedule();
1287 spin_lock_bh(&sk->sk_lock.slock);
1288 if (!sock_owned_by_user(sk))
1289 break;
1290 }
1291 finish_wait(&sk->sk_lock.wq, &wait);
1292 }
1293
1294 static void __release_sock(struct sock *sk)
1295 {
1296 struct sk_buff *skb = sk->sk_backlog.head;
1297
1298 do {
1299 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1300 bh_unlock_sock(sk);
1301
1302 do {
1303 struct sk_buff *next = skb->next;
1304
1305 skb->next = NULL;
1306 sk->sk_backlog_rcv(sk, skb);
1307
1308 /*
1309 * We are in process context here with softirqs
1310 * disabled, use cond_resched_softirq() to preempt.
1311 * This is safe to do because we've taken the backlog
1312 * queue private:
1313 */
1314 cond_resched_softirq();
1315
1316 skb = next;
1317 } while (skb != NULL);
1318
1319 bh_lock_sock(sk);
1320 } while ((skb = sk->sk_backlog.head) != NULL);
1321 }
1322
1323 /**
1324 * sk_wait_data - wait for data to arrive at sk_receive_queue
1325 * @sk: sock to wait on
1326 * @timeo: for how long
1327 *
1328 * Now socket state including sk->sk_err is changed only under lock,
1329 * hence we may omit checks after joining wait queue.
1330 * We check receive queue before schedule() only as optimization;
1331 * it is very likely that release_sock() added new data.
1332 */
1333 int sk_wait_data(struct sock *sk, long *timeo)
1334 {
1335 int rc;
1336 DEFINE_WAIT(wait);
1337
1338 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1339 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1340 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1341 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1342 finish_wait(sk->sk_sleep, &wait);
1343 return rc;
1344 }
1345
1346 EXPORT_SYMBOL(sk_wait_data);
1347
1348 /*
1349 * Set of default routines for initialising struct proto_ops when
1350 * the protocol does not support a particular function. In certain
1351 * cases where it makes no sense for a protocol to have a "do nothing"
1352 * function, some default processing is provided.
1353 */
1354
1355 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1356 {
1357 return -EOPNOTSUPP;
1358 }
1359
1360 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1361 int len, int flags)
1362 {
1363 return -EOPNOTSUPP;
1364 }
1365
1366 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1367 {
1368 return -EOPNOTSUPP;
1369 }
1370
1371 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1372 {
1373 return -EOPNOTSUPP;
1374 }
1375
1376 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1377 int *len, int peer)
1378 {
1379 return -EOPNOTSUPP;
1380 }
1381
1382 unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1383 {
1384 return 0;
1385 }
1386
1387 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1388 {
1389 return -EOPNOTSUPP;
1390 }
1391
1392 int sock_no_listen(struct socket *sock, int backlog)
1393 {
1394 return -EOPNOTSUPP;
1395 }
1396
1397 int sock_no_shutdown(struct socket *sock, int how)
1398 {
1399 return -EOPNOTSUPP;
1400 }
1401
1402 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1403 char __user *optval, int optlen)
1404 {
1405 return -EOPNOTSUPP;
1406 }
1407
1408 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1409 char __user *optval, int __user *optlen)
1410 {
1411 return -EOPNOTSUPP;
1412 }
1413
1414 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1415 size_t len)
1416 {
1417 return -EOPNOTSUPP;
1418 }
1419
1420 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1421 size_t len, int flags)
1422 {
1423 return -EOPNOTSUPP;
1424 }
1425
1426 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1427 {
1428 /* Mirror missing mmap method error code */
1429 return -ENODEV;
1430 }
1431
1432 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1433 {
1434 ssize_t res;
1435 struct msghdr msg = {.msg_flags = flags};
1436 struct kvec iov;
1437 char *kaddr = kmap(page);
1438 iov.iov_base = kaddr + offset;
1439 iov.iov_len = size;
1440 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1441 kunmap(page);
1442 return res;
1443 }
1444
1445 /*
1446 * Default Socket Callbacks
1447 */
1448
1449 static void sock_def_wakeup(struct sock *sk)
1450 {
1451 read_lock(&sk->sk_callback_lock);
1452 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1453 wake_up_interruptible_all(sk->sk_sleep);
1454 read_unlock(&sk->sk_callback_lock);
1455 }
1456
1457 static void sock_def_error_report(struct sock *sk)
1458 {
1459 read_lock(&sk->sk_callback_lock);
1460 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1461 wake_up_interruptible(sk->sk_sleep);
1462 sk_wake_async(sk,0,POLL_ERR);
1463 read_unlock(&sk->sk_callback_lock);
1464 }
1465
1466 static void sock_def_readable(struct sock *sk, int len)
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,1,POLL_IN);
1472 read_unlock(&sk->sk_callback_lock);
1473 }
1474
1475 static void sock_def_write_space(struct sock *sk)
1476 {
1477 read_lock(&sk->sk_callback_lock);
1478
1479 /* Do not wake up a writer until he can make "significant"
1480 * progress. --DaveM
1481 */
1482 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1483 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1484 wake_up_interruptible(sk->sk_sleep);
1485
1486 /* Should agree with poll, otherwise some programs break */
1487 if (sock_writeable(sk))
1488 sk_wake_async(sk, 2, POLL_OUT);
1489 }
1490
1491 read_unlock(&sk->sk_callback_lock);
1492 }
1493
1494 static void sock_def_destruct(struct sock *sk)
1495 {
1496 kfree(sk->sk_protinfo);
1497 }
1498
1499 void sk_send_sigurg(struct sock *sk)
1500 {
1501 if (sk->sk_socket && sk->sk_socket->file)
1502 if (send_sigurg(&sk->sk_socket->file->f_owner))
1503 sk_wake_async(sk, 3, POLL_PRI);
1504 }
1505
1506 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1507 unsigned long expires)
1508 {
1509 if (!mod_timer(timer, expires))
1510 sock_hold(sk);
1511 }
1512
1513 EXPORT_SYMBOL(sk_reset_timer);
1514
1515 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1516 {
1517 if (timer_pending(timer) && del_timer(timer))
1518 __sock_put(sk);
1519 }
1520
1521 EXPORT_SYMBOL(sk_stop_timer);
1522
1523 void sock_init_data(struct socket *sock, struct sock *sk)
1524 {
1525 skb_queue_head_init(&sk->sk_receive_queue);
1526 skb_queue_head_init(&sk->sk_write_queue);
1527 skb_queue_head_init(&sk->sk_error_queue);
1528 #ifdef CONFIG_NET_DMA
1529 skb_queue_head_init(&sk->sk_async_wait_queue);
1530 #endif
1531
1532 sk->sk_send_head = NULL;
1533
1534 init_timer(&sk->sk_timer);
1535
1536 sk->sk_allocation = GFP_KERNEL;
1537 sk->sk_rcvbuf = sysctl_rmem_default;
1538 sk->sk_sndbuf = sysctl_wmem_default;
1539 sk->sk_state = TCP_CLOSE;
1540 sk->sk_socket = sock;
1541
1542 sock_set_flag(sk, SOCK_ZAPPED);
1543
1544 if (sock) {
1545 sk->sk_type = sock->type;
1546 sk->sk_sleep = &sock->wait;
1547 sock->sk = sk;
1548 } else
1549 sk->sk_sleep = NULL;
1550
1551 rwlock_init(&sk->sk_dst_lock);
1552 rwlock_init(&sk->sk_callback_lock);
1553 lockdep_set_class_and_name(&sk->sk_callback_lock,
1554 af_callback_keys + sk->sk_family,
1555 af_family_clock_key_strings[sk->sk_family]);
1556
1557 sk->sk_state_change = sock_def_wakeup;
1558 sk->sk_data_ready = sock_def_readable;
1559 sk->sk_write_space = sock_def_write_space;
1560 sk->sk_error_report = sock_def_error_report;
1561 sk->sk_destruct = sock_def_destruct;
1562
1563 sk->sk_sndmsg_page = NULL;
1564 sk->sk_sndmsg_off = 0;
1565
1566 sk->sk_peercred.pid = 0;
1567 sk->sk_peercred.uid = -1;
1568 sk->sk_peercred.gid = -1;
1569 sk->sk_write_pending = 0;
1570 sk->sk_rcvlowat = 1;
1571 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1572 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1573
1574 sk->sk_stamp = ktime_set(-1L, -1L);
1575
1576 atomic_set(&sk->sk_refcnt, 1);
1577 }
1578
1579 void fastcall lock_sock_nested(struct sock *sk, int subclass)
1580 {
1581 might_sleep();
1582 spin_lock_bh(&sk->sk_lock.slock);
1583 if (sk->sk_lock.owned)
1584 __lock_sock(sk);
1585 sk->sk_lock.owned = 1;
1586 spin_unlock(&sk->sk_lock.slock);
1587 /*
1588 * The sk_lock has mutex_lock() semantics here:
1589 */
1590 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
1591 local_bh_enable();
1592 }
1593
1594 EXPORT_SYMBOL(lock_sock_nested);
1595
1596 void fastcall release_sock(struct sock *sk)
1597 {
1598 /*
1599 * The sk_lock has mutex_unlock() semantics:
1600 */
1601 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1602
1603 spin_lock_bh(&sk->sk_lock.slock);
1604 if (sk->sk_backlog.tail)
1605 __release_sock(sk);
1606 sk->sk_lock.owned = 0;
1607 if (waitqueue_active(&sk->sk_lock.wq))
1608 wake_up(&sk->sk_lock.wq);
1609 spin_unlock_bh(&sk->sk_lock.slock);
1610 }
1611 EXPORT_SYMBOL(release_sock);
1612
1613 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
1614 {
1615 struct timeval tv;
1616 if (!sock_flag(sk, SOCK_TIMESTAMP))
1617 sock_enable_timestamp(sk);
1618 tv = ktime_to_timeval(sk->sk_stamp);
1619 if (tv.tv_sec == -1)
1620 return -ENOENT;
1621 if (tv.tv_sec == 0) {
1622 sk->sk_stamp = ktime_get_real();
1623 tv = ktime_to_timeval(sk->sk_stamp);
1624 }
1625 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
1626 }
1627 EXPORT_SYMBOL(sock_get_timestamp);
1628
1629 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1630 {
1631 struct timespec ts;
1632 if (!sock_flag(sk, SOCK_TIMESTAMP))
1633 sock_enable_timestamp(sk);
1634 ts = ktime_to_timespec(sk->sk_stamp);
1635 if (ts.tv_sec == -1)
1636 return -ENOENT;
1637 if (ts.tv_sec == 0) {
1638 sk->sk_stamp = ktime_get_real();
1639 ts = ktime_to_timespec(sk->sk_stamp);
1640 }
1641 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1642 }
1643 EXPORT_SYMBOL(sock_get_timestampns);
1644
1645 void sock_enable_timestamp(struct sock *sk)
1646 {
1647 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1648 sock_set_flag(sk, SOCK_TIMESTAMP);
1649 net_enable_timestamp();
1650 }
1651 }
1652
1653 /*
1654 * Get a socket option on an socket.
1655 *
1656 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1657 * asynchronous errors should be reported by getsockopt. We assume
1658 * this means if you specify SO_ERROR (otherwise whats the point of it).
1659 */
1660 int sock_common_getsockopt(struct socket *sock, int level, int optname,
1661 char __user *optval, int __user *optlen)
1662 {
1663 struct sock *sk = sock->sk;
1664
1665 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1666 }
1667
1668 EXPORT_SYMBOL(sock_common_getsockopt);
1669
1670 #ifdef CONFIG_COMPAT
1671 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1672 char __user *optval, int __user *optlen)
1673 {
1674 struct sock *sk = sock->sk;
1675
1676 if (sk->sk_prot->compat_getsockopt != NULL)
1677 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1678 optval, optlen);
1679 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1680 }
1681 EXPORT_SYMBOL(compat_sock_common_getsockopt);
1682 #endif
1683
1684 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1685 struct msghdr *msg, size_t size, int flags)
1686 {
1687 struct sock *sk = sock->sk;
1688 int addr_len = 0;
1689 int err;
1690
1691 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1692 flags & ~MSG_DONTWAIT, &addr_len);
1693 if (err >= 0)
1694 msg->msg_namelen = addr_len;
1695 return err;
1696 }
1697
1698 EXPORT_SYMBOL(sock_common_recvmsg);
1699
1700 /*
1701 * Set socket options on an inet socket.
1702 */
1703 int sock_common_setsockopt(struct socket *sock, int level, int optname,
1704 char __user *optval, int optlen)
1705 {
1706 struct sock *sk = sock->sk;
1707
1708 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1709 }
1710
1711 EXPORT_SYMBOL(sock_common_setsockopt);
1712
1713 #ifdef CONFIG_COMPAT
1714 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1715 char __user *optval, int optlen)
1716 {
1717 struct sock *sk = sock->sk;
1718
1719 if (sk->sk_prot->compat_setsockopt != NULL)
1720 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1721 optval, optlen);
1722 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1723 }
1724 EXPORT_SYMBOL(compat_sock_common_setsockopt);
1725 #endif
1726
1727 void sk_common_release(struct sock *sk)
1728 {
1729 if (sk->sk_prot->destroy)
1730 sk->sk_prot->destroy(sk);
1731
1732 /*
1733 * Observation: when sock_common_release is called, processes have
1734 * no access to socket. But net still has.
1735 * Step one, detach it from networking:
1736 *
1737 * A. Remove from hash tables.
1738 */
1739
1740 sk->sk_prot->unhash(sk);
1741
1742 /*
1743 * In this point socket cannot receive new packets, but it is possible
1744 * that some packets are in flight because some CPU runs receiver and
1745 * did hash table lookup before we unhashed socket. They will achieve
1746 * receive queue and will be purged by socket destructor.
1747 *
1748 * Also we still have packets pending on receive queue and probably,
1749 * our own packets waiting in device queues. sock_destroy will drain
1750 * receive queue, but transmitted packets will delay socket destruction
1751 * until the last reference will be released.
1752 */
1753
1754 sock_orphan(sk);
1755
1756 xfrm_sk_free_policy(sk);
1757
1758 sk_refcnt_debug_release(sk);
1759 sock_put(sk);
1760 }
1761
1762 EXPORT_SYMBOL(sk_common_release);
1763
1764 static DEFINE_RWLOCK(proto_list_lock);
1765 static LIST_HEAD(proto_list);
1766
1767 int proto_register(struct proto *prot, int alloc_slab)
1768 {
1769 char *request_sock_slab_name = NULL;
1770 char *timewait_sock_slab_name;
1771 int rc = -ENOBUFS;
1772
1773 if (alloc_slab) {
1774 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
1775 SLAB_HWCACHE_ALIGN, NULL);
1776
1777 if (prot->slab == NULL) {
1778 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
1779 prot->name);
1780 goto out;
1781 }
1782
1783 if (prot->rsk_prot != NULL) {
1784 static const char mask[] = "request_sock_%s";
1785
1786 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1787 if (request_sock_slab_name == NULL)
1788 goto out_free_sock_slab;
1789
1790 sprintf(request_sock_slab_name, mask, prot->name);
1791 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
1792 prot->rsk_prot->obj_size, 0,
1793 SLAB_HWCACHE_ALIGN, NULL);
1794
1795 if (prot->rsk_prot->slab == NULL) {
1796 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
1797 prot->name);
1798 goto out_free_request_sock_slab_name;
1799 }
1800 }
1801
1802 if (prot->twsk_prot != NULL) {
1803 static const char mask[] = "tw_sock_%s";
1804
1805 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1806
1807 if (timewait_sock_slab_name == NULL)
1808 goto out_free_request_sock_slab;
1809
1810 sprintf(timewait_sock_slab_name, mask, prot->name);
1811 prot->twsk_prot->twsk_slab =
1812 kmem_cache_create(timewait_sock_slab_name,
1813 prot->twsk_prot->twsk_obj_size,
1814 0, SLAB_HWCACHE_ALIGN,
1815 NULL);
1816 if (prot->twsk_prot->twsk_slab == NULL)
1817 goto out_free_timewait_sock_slab_name;
1818 }
1819 }
1820
1821 write_lock(&proto_list_lock);
1822 list_add(&prot->node, &proto_list);
1823 write_unlock(&proto_list_lock);
1824 rc = 0;
1825 out:
1826 return rc;
1827 out_free_timewait_sock_slab_name:
1828 kfree(timewait_sock_slab_name);
1829 out_free_request_sock_slab:
1830 if (prot->rsk_prot && prot->rsk_prot->slab) {
1831 kmem_cache_destroy(prot->rsk_prot->slab);
1832 prot->rsk_prot->slab = NULL;
1833 }
1834 out_free_request_sock_slab_name:
1835 kfree(request_sock_slab_name);
1836 out_free_sock_slab:
1837 kmem_cache_destroy(prot->slab);
1838 prot->slab = NULL;
1839 goto out;
1840 }
1841
1842 EXPORT_SYMBOL(proto_register);
1843
1844 void proto_unregister(struct proto *prot)
1845 {
1846 write_lock(&proto_list_lock);
1847 list_del(&prot->node);
1848 write_unlock(&proto_list_lock);
1849
1850 if (prot->slab != NULL) {
1851 kmem_cache_destroy(prot->slab);
1852 prot->slab = NULL;
1853 }
1854
1855 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
1856 const char *name = kmem_cache_name(prot->rsk_prot->slab);
1857
1858 kmem_cache_destroy(prot->rsk_prot->slab);
1859 kfree(name);
1860 prot->rsk_prot->slab = NULL;
1861 }
1862
1863 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
1864 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
1865
1866 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
1867 kfree(name);
1868 prot->twsk_prot->twsk_slab = NULL;
1869 }
1870 }
1871
1872 EXPORT_SYMBOL(proto_unregister);
1873
1874 #ifdef CONFIG_PROC_FS
1875 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
1876 {
1877 read_lock(&proto_list_lock);
1878 return seq_list_start_head(&proto_list, *pos);
1879 }
1880
1881 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1882 {
1883 return seq_list_next(v, &proto_list, pos);
1884 }
1885
1886 static void proto_seq_stop(struct seq_file *seq, void *v)
1887 {
1888 read_unlock(&proto_list_lock);
1889 }
1890
1891 static char proto_method_implemented(const void *method)
1892 {
1893 return method == NULL ? 'n' : 'y';
1894 }
1895
1896 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
1897 {
1898 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
1899 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
1900 proto->name,
1901 proto->obj_size,
1902 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
1903 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
1904 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
1905 proto->max_header,
1906 proto->slab == NULL ? "no" : "yes",
1907 module_name(proto->owner),
1908 proto_method_implemented(proto->close),
1909 proto_method_implemented(proto->connect),
1910 proto_method_implemented(proto->disconnect),
1911 proto_method_implemented(proto->accept),
1912 proto_method_implemented(proto->ioctl),
1913 proto_method_implemented(proto->init),
1914 proto_method_implemented(proto->destroy),
1915 proto_method_implemented(proto->shutdown),
1916 proto_method_implemented(proto->setsockopt),
1917 proto_method_implemented(proto->getsockopt),
1918 proto_method_implemented(proto->sendmsg),
1919 proto_method_implemented(proto->recvmsg),
1920 proto_method_implemented(proto->sendpage),
1921 proto_method_implemented(proto->bind),
1922 proto_method_implemented(proto->backlog_rcv),
1923 proto_method_implemented(proto->hash),
1924 proto_method_implemented(proto->unhash),
1925 proto_method_implemented(proto->get_port),
1926 proto_method_implemented(proto->enter_memory_pressure));
1927 }
1928
1929 static int proto_seq_show(struct seq_file *seq, void *v)
1930 {
1931 if (v == &proto_list)
1932 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
1933 "protocol",
1934 "size",
1935 "sockets",
1936 "memory",
1937 "press",
1938 "maxhdr",
1939 "slab",
1940 "module",
1941 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
1942 else
1943 proto_seq_printf(seq, list_entry(v, struct proto, node));
1944 return 0;
1945 }
1946
1947 static const struct seq_operations proto_seq_ops = {
1948 .start = proto_seq_start,
1949 .next = proto_seq_next,
1950 .stop = proto_seq_stop,
1951 .show = proto_seq_show,
1952 };
1953
1954 static int proto_seq_open(struct inode *inode, struct file *file)
1955 {
1956 return seq_open(file, &proto_seq_ops);
1957 }
1958
1959 static const struct file_operations proto_seq_fops = {
1960 .owner = THIS_MODULE,
1961 .open = proto_seq_open,
1962 .read = seq_read,
1963 .llseek = seq_lseek,
1964 .release = seq_release,
1965 };
1966
1967 static int __init proto_init(void)
1968 {
1969 /* register /proc/net/protocols */
1970 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
1971 }
1972
1973 subsys_initcall(proto_init);
1974
1975 #endif /* PROC_FS */
1976
1977 EXPORT_SYMBOL(sk_alloc);
1978 EXPORT_SYMBOL(sk_free);
1979 EXPORT_SYMBOL(sk_send_sigurg);
1980 EXPORT_SYMBOL(sock_alloc_send_skb);
1981 EXPORT_SYMBOL(sock_init_data);
1982 EXPORT_SYMBOL(sock_kfree_s);
1983 EXPORT_SYMBOL(sock_kmalloc);
1984 EXPORT_SYMBOL(sock_no_accept);
1985 EXPORT_SYMBOL(sock_no_bind);
1986 EXPORT_SYMBOL(sock_no_connect);
1987 EXPORT_SYMBOL(sock_no_getname);
1988 EXPORT_SYMBOL(sock_no_getsockopt);
1989 EXPORT_SYMBOL(sock_no_ioctl);
1990 EXPORT_SYMBOL(sock_no_listen);
1991 EXPORT_SYMBOL(sock_no_mmap);
1992 EXPORT_SYMBOL(sock_no_poll);
1993 EXPORT_SYMBOL(sock_no_recvmsg);
1994 EXPORT_SYMBOL(sock_no_sendmsg);
1995 EXPORT_SYMBOL(sock_no_sendpage);
1996 EXPORT_SYMBOL(sock_no_setsockopt);
1997 EXPORT_SYMBOL(sock_no_shutdown);
1998 EXPORT_SYMBOL(sock_no_socketpair);
1999 EXPORT_SYMBOL(sock_rfree);
2000 EXPORT_SYMBOL(sock_setsockopt);
2001 EXPORT_SYMBOL(sock_wfree);
2002 EXPORT_SYMBOL(sock_wmalloc);
2003 EXPORT_SYMBOL(sock_i_uid);
2004 EXPORT_SYMBOL(sock_i_ino);
2005 EXPORT_SYMBOL(sysctl_optmem_max);
2006 #ifdef CONFIG_SYSCTL
2007 EXPORT_SYMBOL(sysctl_rmem_max);
2008 EXPORT_SYMBOL(sysctl_wmem_max);
2009 #endif
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