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USB: cp210x: call generic open last in open
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / core / sock.c
blobaebb419519b38163f1b60ef613ce6388692ac3d4
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 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
35 * code. The ACK stuff can wait and needs major
36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
92 #include <linux/capability.h>
93 #include <linux/errno.h>
94 #include <linux/types.h>
95 #include <linux/socket.h>
96 #include <linux/in.h>
97 #include <linux/kernel.h>
98 #include <linux/module.h>
99 #include <linux/proc_fs.h>
100 #include <linux/seq_file.h>
101 #include <linux/sched.h>
102 #include <linux/timer.h>
103 #include <linux/string.h>
104 #include <linux/sockios.h>
105 #include <linux/net.h>
106 #include <linux/mm.h>
107 #include <linux/slab.h>
108 #include <linux/interrupt.h>
109 #include <linux/poll.h>
110 #include <linux/tcp.h>
111 #include <linux/init.h>
112 #include <linux/highmem.h>
113 #include <linux/user_namespace.h>
114
115 #include <asm/uaccess.h>
116 #include <asm/system.h>
117
118 #include <linux/netdevice.h>
119 #include <net/protocol.h>
120 #include <linux/skbuff.h>
121 #include <net/net_namespace.h>
122 #include <net/request_sock.h>
123 #include <net/sock.h>
124 #include <linux/net_tstamp.h>
125 #include <net/xfrm.h>
126 #include <linux/ipsec.h>
127 #include <net/cls_cgroup.h>
128
129 #include <linux/filter.h>
130
131 #ifdef CONFIG_INET
132 #include <net/tcp.h>
133 #endif
134
135 /*
136 * Each address family might have different locking rules, so we have
137 * one slock key per address family:
138 */
139 static struct lock_class_key af_family_keys[AF_MAX];
140 static struct lock_class_key af_family_slock_keys[AF_MAX];
141
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 *const 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-AF_RDS" , "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-AF_CAN" ,
158 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
159 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
160 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
161 "sk_lock-AF_MAX"
162 };
163 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
164 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
165 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
166 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
167 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
168 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
169 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
170 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
171 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
172 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
173 "slock-27" , "slock-28" , "slock-AF_CAN" ,
174 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
175 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
176 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
177 "slock-AF_MAX"
178 };
179 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
180 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
181 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
182 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
183 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
184 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
185 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
186 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
187 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
188 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
189 "clock-27" , "clock-28" , "clock-AF_CAN" ,
190 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
191 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
192 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
193 "clock-AF_MAX"
194 };
195
196 /*
197 * sk_callback_lock locking rules are per-address-family,
198 * so split the lock classes by using a per-AF key:
199 */
200 static struct lock_class_key af_callback_keys[AF_MAX];
201
202 /* Take into consideration the size of the struct sk_buff overhead in the
203 * determination of these values, since that is non-constant across
204 * platforms. This makes socket queueing behavior and performance
205 * not depend upon such differences.
206 */
207 #define _SK_MEM_PACKETS 256
208 #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
209 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
210 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
211
212 /* Run time adjustable parameters. */
213 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
214 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
215 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
216 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
217
218 /* Maximal space eaten by iovec or ancillary data plus some space */
219 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
220 EXPORT_SYMBOL(sysctl_optmem_max);
221
222 #if defined(CONFIG_CGROUPS) && !defined(CONFIG_NET_CLS_CGROUP)
223 int net_cls_subsys_id = -1;
224 EXPORT_SYMBOL_GPL(net_cls_subsys_id);
225 #endif
226
227 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
228 {
229 struct timeval tv;
230
231 if (optlen < sizeof(tv))
232 return -EINVAL;
233 if (copy_from_user(&tv, optval, sizeof(tv)))
234 return -EFAULT;
235 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
236 return -EDOM;
237
238 if (tv.tv_sec < 0) {
239 static int warned __read_mostly;
240
241 *timeo_p = 0;
242 if (warned < 10 && net_ratelimit()) {
243 warned++;
244 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
245 "tries to set negative timeout\n",
246 current->comm, task_pid_nr(current));
247 }
248 return 0;
249 }
250 *timeo_p = MAX_SCHEDULE_TIMEOUT;
251 if (tv.tv_sec == 0 && tv.tv_usec == 0)
252 return 0;
253 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
254 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
255 return 0;
256 }
257
258 static void sock_warn_obsolete_bsdism(const char *name)
259 {
260 static int warned;
261 static char warncomm[TASK_COMM_LEN];
262 if (strcmp(warncomm, current->comm) && warned < 5) {
263 strcpy(warncomm, current->comm);
264 printk(KERN_WARNING "process `%s' is using obsolete "
265 "%s SO_BSDCOMPAT\n", warncomm, name);
266 warned++;
267 }
268 }
269
270 static void sock_disable_timestamp(struct sock *sk, int flag)
271 {
272 if (sock_flag(sk, flag)) {
273 sock_reset_flag(sk, flag);
274 if (!sock_flag(sk, SOCK_TIMESTAMP) &&
275 !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) {
276 net_disable_timestamp();
277 }
278 }
279 }
280
281
282 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
283 {
284 int err;
285 int skb_len;
286 unsigned long flags;
287 struct sk_buff_head *list = &sk->sk_receive_queue;
288
289 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
290 number of warnings when compiling with -W --ANK
291 */
292 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
293 (unsigned)sk->sk_rcvbuf) {
294 atomic_inc(&sk->sk_drops);
295 return -ENOMEM;
296 }
297
298 err = sk_filter(sk, skb);
299 if (err)
300 return err;
301
302 if (!sk_rmem_schedule(sk, skb->truesize)) {
303 atomic_inc(&sk->sk_drops);
304 return -ENOBUFS;
305 }
306
307 skb->dev = NULL;
308 skb_set_owner_r(skb, sk);
309
310 /* Cache the SKB length before we tack it onto the receive
311 * queue. Once it is added it no longer belongs to us and
312 * may be freed by other threads of control pulling packets
313 * from the queue.
314 */
315 skb_len = skb->len;
316
317 /* we escape from rcu protected region, make sure we dont leak
318 * a norefcounted dst
319 */
320 skb_dst_force(skb);
321
322 spin_lock_irqsave(&list->lock, flags);
323 skb->dropcount = atomic_read(&sk->sk_drops);
324 __skb_queue_tail(list, skb);
325 spin_unlock_irqrestore(&list->lock, flags);
326
327 if (!sock_flag(sk, SOCK_DEAD))
328 sk->sk_data_ready(sk, skb_len);
329 return 0;
330 }
331 EXPORT_SYMBOL(sock_queue_rcv_skb);
332
333 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
334 {
335 int rc = NET_RX_SUCCESS;
336
337 if (sk_filter(sk, skb))
338 goto discard_and_relse;
339
340 skb->dev = NULL;
341
342 if (sk_rcvqueues_full(sk, skb)) {
343 atomic_inc(&sk->sk_drops);
344 goto discard_and_relse;
345 }
346 if (nested)
347 bh_lock_sock_nested(sk);
348 else
349 bh_lock_sock(sk);
350 if (!sock_owned_by_user(sk)) {
351 /*
352 * trylock + unlock semantics:
353 */
354 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
355
356 rc = sk_backlog_rcv(sk, skb);
357
358 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
359 } else if (sk_add_backlog(sk, skb)) {
360 bh_unlock_sock(sk);
361 atomic_inc(&sk->sk_drops);
362 goto discard_and_relse;
363 }
364
365 bh_unlock_sock(sk);
366 out:
367 sock_put(sk);
368 return rc;
369 discard_and_relse:
370 kfree_skb(skb);
371 goto out;
372 }
373 EXPORT_SYMBOL(sk_receive_skb);
374
375 void sk_reset_txq(struct sock *sk)
376 {
377 sk_tx_queue_clear(sk);
378 }
379 EXPORT_SYMBOL(sk_reset_txq);
380
381 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
382 {
383 struct dst_entry *dst = __sk_dst_get(sk);
384
385 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
386 sk_tx_queue_clear(sk);
387 rcu_assign_pointer(sk->sk_dst_cache, NULL);
388 dst_release(dst);
389 return NULL;
390 }
391
392 return dst;
393 }
394 EXPORT_SYMBOL(__sk_dst_check);
395
396 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
397 {
398 struct dst_entry *dst = sk_dst_get(sk);
399
400 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
401 sk_dst_reset(sk);
402 dst_release(dst);
403 return NULL;
404 }
405
406 return dst;
407 }
408 EXPORT_SYMBOL(sk_dst_check);
409
410 static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
411 {
412 int ret = -ENOPROTOOPT;
413 #ifdef CONFIG_NETDEVICES
414 struct net *net = sock_net(sk);
415 char devname[IFNAMSIZ];
416 int index;
417
418 /* Sorry... */
419 ret = -EPERM;
420 if (!capable(CAP_NET_RAW))
421 goto out;
422
423 ret = -EINVAL;
424 if (optlen < 0)
425 goto out;
426
427 /* Bind this socket to a particular device like "eth0",
428 * as specified in the passed interface name. If the
429 * name is "" or the option length is zero the socket
430 * is not bound.
431 */
432 if (optlen > IFNAMSIZ - 1)
433 optlen = IFNAMSIZ - 1;
434 memset(devname, 0, sizeof(devname));
435
436 ret = -EFAULT;
437 if (copy_from_user(devname, optval, optlen))
438 goto out;
439
440 index = 0;
441 if (devname[0] != '\0') {
442 struct net_device *dev;
443
444 rcu_read_lock();
445 dev = dev_get_by_name_rcu(net, devname);
446 if (dev)
447 index = dev->ifindex;
448 rcu_read_unlock();
449 ret = -ENODEV;
450 if (!dev)
451 goto out;
452 }
453
454 lock_sock(sk);
455 sk->sk_bound_dev_if = index;
456 sk_dst_reset(sk);
457 release_sock(sk);
458
459 ret = 0;
460
461 out:
462 #endif
463
464 return ret;
465 }
466
467 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
468 {
469 if (valbool)
470 sock_set_flag(sk, bit);
471 else
472 sock_reset_flag(sk, bit);
473 }
474
475 /*
476 * This is meant for all protocols to use and covers goings on
477 * at the socket level. Everything here is generic.
478 */
479
480 int sock_setsockopt(struct socket *sock, int level, int optname,
481 char __user *optval, unsigned int optlen)
482 {
483 struct sock *sk = sock->sk;
484 int val;
485 int valbool;
486 struct linger ling;
487 int ret = 0;
488
489 /*
490 * Options without arguments
491 */
492
493 if (optname == SO_BINDTODEVICE)
494 return sock_bindtodevice(sk, optval, optlen);
495
496 if (optlen < sizeof(int))
497 return -EINVAL;
498
499 if (get_user(val, (int __user *)optval))
500 return -EFAULT;
501
502 valbool = val ? 1 : 0;
503
504 lock_sock(sk);
505
506 switch (optname) {
507 case SO_DEBUG:
508 if (val && !capable(CAP_NET_ADMIN))
509 ret = -EACCES;
510 else
511 sock_valbool_flag(sk, SOCK_DBG, valbool);
512 break;
513 case SO_REUSEADDR:
514 sk->sk_reuse = valbool;
515 break;
516 case SO_TYPE:
517 case SO_PROTOCOL:
518 case SO_DOMAIN:
519 case SO_ERROR:
520 ret = -ENOPROTOOPT;
521 break;
522 case SO_DONTROUTE:
523 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
524 break;
525 case SO_BROADCAST:
526 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
527 break;
528 case SO_SNDBUF:
529 /* Don't error on this BSD doesn't and if you think
530 about it this is right. Otherwise apps have to
531 play 'guess the biggest size' games. RCVBUF/SNDBUF
532 are treated in BSD as hints */
533
534 if (val > sysctl_wmem_max)
535 val = sysctl_wmem_max;
536 set_sndbuf:
537 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
538 if ((val * 2) < SOCK_MIN_SNDBUF)
539 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
540 else
541 sk->sk_sndbuf = val * 2;
542
543 /*
544 * Wake up sending tasks if we
545 * upped the value.
546 */
547 sk->sk_write_space(sk);
548 break;
549
550 case SO_SNDBUFFORCE:
551 if (!capable(CAP_NET_ADMIN)) {
552 ret = -EPERM;
553 break;
554 }
555 goto set_sndbuf;
556
557 case SO_RCVBUF:
558 /* Don't error on this BSD doesn't and if you think
559 about it this is right. Otherwise apps have to
560 play 'guess the biggest size' games. RCVBUF/SNDBUF
561 are treated in BSD as hints */
562
563 if (val > sysctl_rmem_max)
564 val = sysctl_rmem_max;
565 set_rcvbuf:
566 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
567 /*
568 * We double it on the way in to account for
569 * "struct sk_buff" etc. overhead. Applications
570 * assume that the SO_RCVBUF setting they make will
571 * allow that much actual data to be received on that
572 * socket.
573 *
574 * Applications are unaware that "struct sk_buff" and
575 * other overheads allocate from the receive buffer
576 * during socket buffer allocation.
577 *
578 * And after considering the possible alternatives,
579 * returning the value we actually used in getsockopt
580 * is the most desirable behavior.
581 */
582 if ((val * 2) < SOCK_MIN_RCVBUF)
583 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
584 else
585 sk->sk_rcvbuf = val * 2;
586 break;
587
588 case SO_RCVBUFFORCE:
589 if (!capable(CAP_NET_ADMIN)) {
590 ret = -EPERM;
591 break;
592 }
593 goto set_rcvbuf;
594
595 case SO_KEEPALIVE:
596 #ifdef CONFIG_INET
597 if (sk->sk_protocol == IPPROTO_TCP)
598 tcp_set_keepalive(sk, valbool);
599 #endif
600 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
601 break;
602
603 case SO_OOBINLINE:
604 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
605 break;
606
607 case SO_NO_CHECK:
608 sk->sk_no_check = valbool;
609 break;
610
611 case SO_PRIORITY:
612 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
613 sk->sk_priority = val;
614 else
615 ret = -EPERM;
616 break;
617
618 case SO_LINGER:
619 if (optlen < sizeof(ling)) {
620 ret = -EINVAL; /* 1003.1g */
621 break;
622 }
623 if (copy_from_user(&ling, optval, sizeof(ling))) {
624 ret = -EFAULT;
625 break;
626 }
627 if (!ling.l_onoff)
628 sock_reset_flag(sk, SOCK_LINGER);
629 else {
630 #if (BITS_PER_LONG == 32)
631 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
632 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
633 else
634 #endif
635 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
636 sock_set_flag(sk, SOCK_LINGER);
637 }
638 break;
639
640 case SO_BSDCOMPAT:
641 sock_warn_obsolete_bsdism("setsockopt");
642 break;
643
644 case SO_PASSCRED:
645 if (valbool)
646 set_bit(SOCK_PASSCRED, &sock->flags);
647 else
648 clear_bit(SOCK_PASSCRED, &sock->flags);
649 break;
650
651 case SO_TIMESTAMP:
652 case SO_TIMESTAMPNS:
653 if (valbool) {
654 if (optname == SO_TIMESTAMP)
655 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
656 else
657 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
658 sock_set_flag(sk, SOCK_RCVTSTAMP);
659 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
660 } else {
661 sock_reset_flag(sk, SOCK_RCVTSTAMP);
662 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
663 }
664 break;
665
666 case SO_TIMESTAMPING:
667 if (val & ~SOF_TIMESTAMPING_MASK) {
668 ret = -EINVAL;
669 break;
670 }
671 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
672 val & SOF_TIMESTAMPING_TX_HARDWARE);
673 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
674 val & SOF_TIMESTAMPING_TX_SOFTWARE);
675 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
676 val & SOF_TIMESTAMPING_RX_HARDWARE);
677 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
678 sock_enable_timestamp(sk,
679 SOCK_TIMESTAMPING_RX_SOFTWARE);
680 else
681 sock_disable_timestamp(sk,
682 SOCK_TIMESTAMPING_RX_SOFTWARE);
683 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
684 val & SOF_TIMESTAMPING_SOFTWARE);
685 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
686 val & SOF_TIMESTAMPING_SYS_HARDWARE);
687 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
688 val & SOF_TIMESTAMPING_RAW_HARDWARE);
689 break;
690
691 case SO_RCVLOWAT:
692 if (val < 0)
693 val = INT_MAX;
694 sk->sk_rcvlowat = val ? : 1;
695 break;
696
697 case SO_RCVTIMEO:
698 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
699 break;
700
701 case SO_SNDTIMEO:
702 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
703 break;
704
705 case SO_ATTACH_FILTER:
706 ret = -EINVAL;
707 if (optlen == sizeof(struct sock_fprog)) {
708 struct sock_fprog fprog;
709
710 ret = -EFAULT;
711 if (copy_from_user(&fprog, optval, sizeof(fprog)))
712 break;
713
714 ret = sk_attach_filter(&fprog, sk);
715 }
716 break;
717
718 case SO_DETACH_FILTER:
719 ret = sk_detach_filter(sk);
720 break;
721
722 case SO_PASSSEC:
723 if (valbool)
724 set_bit(SOCK_PASSSEC, &sock->flags);
725 else
726 clear_bit(SOCK_PASSSEC, &sock->flags);
727 break;
728 case SO_MARK:
729 if (!capable(CAP_NET_ADMIN))
730 ret = -EPERM;
731 else
732 sk->sk_mark = val;
733 break;
734
735 /* We implement the SO_SNDLOWAT etc to
736 not be settable (1003.1g 5.3) */
737 case SO_RXQ_OVFL:
738 if (valbool)
739 sock_set_flag(sk, SOCK_RXQ_OVFL);
740 else
741 sock_reset_flag(sk, SOCK_RXQ_OVFL);
742 break;
743 default:
744 ret = -ENOPROTOOPT;
745 break;
746 }
747 release_sock(sk);
748 return ret;
749 }
750 EXPORT_SYMBOL(sock_setsockopt);
751
752
753 void cred_to_ucred(struct pid *pid, const struct cred *cred,
754 struct ucred *ucred)
755 {
756 ucred->pid = pid_vnr(pid);
757 ucred->uid = ucred->gid = -1;
758 if (cred) {
759 struct user_namespace *current_ns = current_user_ns();
760
761 ucred->uid = user_ns_map_uid(current_ns, cred, cred->euid);
762 ucred->gid = user_ns_map_gid(current_ns, cred, cred->egid);
763 }
764 }
765 EXPORT_SYMBOL_GPL(cred_to_ucred);
766
767 int sock_getsockopt(struct socket *sock, int level, int optname,
768 char __user *optval, int __user *optlen)
769 {
770 struct sock *sk = sock->sk;
771
772 union {
773 int val;
774 struct linger ling;
775 struct timeval tm;
776 } v;
777
778 int lv = sizeof(int);
779 int len;
780
781 if (get_user(len, optlen))
782 return -EFAULT;
783 if (len < 0)
784 return -EINVAL;
785
786 memset(&v, 0, sizeof(v));
787
788 switch (optname) {
789 case SO_DEBUG:
790 v.val = sock_flag(sk, SOCK_DBG);
791 break;
792
793 case SO_DONTROUTE:
794 v.val = sock_flag(sk, SOCK_LOCALROUTE);
795 break;
796
797 case SO_BROADCAST:
798 v.val = !!sock_flag(sk, SOCK_BROADCAST);
799 break;
800
801 case SO_SNDBUF:
802 v.val = sk->sk_sndbuf;
803 break;
804
805 case SO_RCVBUF:
806 v.val = sk->sk_rcvbuf;
807 break;
808
809 case SO_REUSEADDR:
810 v.val = sk->sk_reuse;
811 break;
812
813 case SO_KEEPALIVE:
814 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
815 break;
816
817 case SO_TYPE:
818 v.val = sk->sk_type;
819 break;
820
821 case SO_PROTOCOL:
822 v.val = sk->sk_protocol;
823 break;
824
825 case SO_DOMAIN:
826 v.val = sk->sk_family;
827 break;
828
829 case SO_ERROR:
830 v.val = -sock_error(sk);
831 if (v.val == 0)
832 v.val = xchg(&sk->sk_err_soft, 0);
833 break;
834
835 case SO_OOBINLINE:
836 v.val = !!sock_flag(sk, SOCK_URGINLINE);
837 break;
838
839 case SO_NO_CHECK:
840 v.val = sk->sk_no_check;
841 break;
842
843 case SO_PRIORITY:
844 v.val = sk->sk_priority;
845 break;
846
847 case SO_LINGER:
848 lv = sizeof(v.ling);
849 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
850 v.ling.l_linger = sk->sk_lingertime / HZ;
851 break;
852
853 case SO_BSDCOMPAT:
854 sock_warn_obsolete_bsdism("getsockopt");
855 break;
856
857 case SO_TIMESTAMP:
858 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
859 !sock_flag(sk, SOCK_RCVTSTAMPNS);
860 break;
861
862 case SO_TIMESTAMPNS:
863 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
864 break;
865
866 case SO_TIMESTAMPING:
867 v.val = 0;
868 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
869 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
870 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
871 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
872 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
873 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
874 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
875 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
876 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
877 v.val |= SOF_TIMESTAMPING_SOFTWARE;
878 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
879 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
880 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
881 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
882 break;
883
884 case SO_RCVTIMEO:
885 lv = sizeof(struct timeval);
886 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
887 v.tm.tv_sec = 0;
888 v.tm.tv_usec = 0;
889 } else {
890 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
891 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
892 }
893 break;
894
895 case SO_SNDTIMEO:
896 lv = sizeof(struct timeval);
897 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
898 v.tm.tv_sec = 0;
899 v.tm.tv_usec = 0;
900 } else {
901 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
902 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
903 }
904 break;
905
906 case SO_RCVLOWAT:
907 v.val = sk->sk_rcvlowat;
908 break;
909
910 case SO_SNDLOWAT:
911 v.val = 1;
912 break;
913
914 case SO_PASSCRED:
915 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
916 break;
917
918 case SO_PEERCRED:
919 {
920 struct ucred peercred;
921 if (len > sizeof(peercred))
922 len = sizeof(peercred);
923 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
924 if (copy_to_user(optval, &peercred, len))
925 return -EFAULT;
926 goto lenout;
927 }
928
929 case SO_PEERNAME:
930 {
931 char address[128];
932
933 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
934 return -ENOTCONN;
935 if (lv < len)
936 return -EINVAL;
937 if (copy_to_user(optval, address, len))
938 return -EFAULT;
939 goto lenout;
940 }
941
942 /* Dubious BSD thing... Probably nobody even uses it, but
943 * the UNIX standard wants it for whatever reason... -DaveM
944 */
945 case SO_ACCEPTCONN:
946 v.val = sk->sk_state == TCP_LISTEN;
947 break;
948
949 case SO_PASSSEC:
950 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
951 break;
952
953 case SO_PEERSEC:
954 return security_socket_getpeersec_stream(sock, optval, optlen, len);
955
956 case SO_MARK:
957 v.val = sk->sk_mark;
958 break;
959
960 case SO_RXQ_OVFL:
961 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
962 break;
963
964 default:
965 return -ENOPROTOOPT;
966 }
967
968 if (len > lv)
969 len = lv;
970 if (copy_to_user(optval, &v, len))
971 return -EFAULT;
972 lenout:
973 if (put_user(len, optlen))
974 return -EFAULT;
975 return 0;
976 }
977
978 /*
979 * Initialize an sk_lock.
980 *
981 * (We also register the sk_lock with the lock validator.)
982 */
983 static inline void sock_lock_init(struct sock *sk)
984 {
985 sock_lock_init_class_and_name(sk,
986 af_family_slock_key_strings[sk->sk_family],
987 af_family_slock_keys + sk->sk_family,
988 af_family_key_strings[sk->sk_family],
989 af_family_keys + sk->sk_family);
990 }
991
992 /*
993 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
994 * even temporarly, because of RCU lookups. sk_node should also be left as is.
995 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
996 */
997 static void sock_copy(struct sock *nsk, const struct sock *osk)
998 {
999 #ifdef CONFIG_SECURITY_NETWORK
1000 void *sptr = nsk->sk_security;
1001 #endif
1002 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1003
1004 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1005 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1006
1007 #ifdef CONFIG_SECURITY_NETWORK
1008 nsk->sk_security = sptr;
1009 security_sk_clone(osk, nsk);
1010 #endif
1011 }
1012
1013 /*
1014 * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
1015 * un-modified. Special care is taken when initializing object to zero.
1016 */
1017 static inline void sk_prot_clear_nulls(struct sock *sk, int size)
1018 {
1019 if (offsetof(struct sock, sk_node.next) != 0)
1020 memset(sk, 0, offsetof(struct sock, sk_node.next));
1021 memset(&sk->sk_node.pprev, 0,
1022 size - offsetof(struct sock, sk_node.pprev));
1023 }
1024
1025 void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1026 {
1027 unsigned long nulls1, nulls2;
1028
1029 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1030 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1031 if (nulls1 > nulls2)
1032 swap(nulls1, nulls2);
1033
1034 if (nulls1 != 0)
1035 memset((char *)sk, 0, nulls1);
1036 memset((char *)sk + nulls1 + sizeof(void *), 0,
1037 nulls2 - nulls1 - sizeof(void *));
1038 memset((char *)sk + nulls2 + sizeof(void *), 0,
1039 size - nulls2 - sizeof(void *));
1040 }
1041 EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1042
1043 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1044 int family)
1045 {
1046 struct sock *sk;
1047 struct kmem_cache *slab;
1048
1049 slab = prot->slab;
1050 if (slab != NULL) {
1051 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1052 if (!sk)
1053 return sk;
1054 if (priority & __GFP_ZERO) {
1055 if (prot->clear_sk)
1056 prot->clear_sk(sk, prot->obj_size);
1057 else
1058 sk_prot_clear_nulls(sk, prot->obj_size);
1059 }
1060 } else
1061 sk = kmalloc(prot->obj_size, priority);
1062
1063 if (sk != NULL) {
1064 kmemcheck_annotate_bitfield(sk, flags);
1065
1066 if (security_sk_alloc(sk, family, priority))
1067 goto out_free;
1068
1069 if (!try_module_get(prot->owner))
1070 goto out_free_sec;
1071 sk_tx_queue_clear(sk);
1072 }
1073
1074 return sk;
1075
1076 out_free_sec:
1077 security_sk_free(sk);
1078 out_free:
1079 if (slab != NULL)
1080 kmem_cache_free(slab, sk);
1081 else
1082 kfree(sk);
1083 return NULL;
1084 }
1085
1086 static void sk_prot_free(struct proto *prot, struct sock *sk)
1087 {
1088 struct kmem_cache *slab;
1089 struct module *owner;
1090
1091 owner = prot->owner;
1092 slab = prot->slab;
1093
1094 security_sk_free(sk);
1095 if (slab != NULL)
1096 kmem_cache_free(slab, sk);
1097 else
1098 kfree(sk);
1099 module_put(owner);
1100 }
1101
1102 #ifdef CONFIG_CGROUPS
1103 void sock_update_classid(struct sock *sk)
1104 {
1105 u32 classid;
1106
1107 rcu_read_lock(); /* doing current task, which cannot vanish. */
1108 classid = task_cls_classid(current);
1109 rcu_read_unlock();
1110 if (classid && classid != sk->sk_classid)
1111 sk->sk_classid = classid;
1112 }
1113 EXPORT_SYMBOL(sock_update_classid);
1114 #endif
1115
1116 /**
1117 * sk_alloc - All socket objects are allocated here
1118 * @net: the applicable net namespace
1119 * @family: protocol family
1120 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1121 * @prot: struct proto associated with this new sock instance
1122 */
1123 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1124 struct proto *prot)
1125 {
1126 struct sock *sk;
1127
1128 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1129 if (sk) {
1130 sk->sk_family = family;
1131 /*
1132 * See comment in struct sock definition to understand
1133 * why we need sk_prot_creator -acme
1134 */
1135 sk->sk_prot = sk->sk_prot_creator = prot;
1136 sock_lock_init(sk);
1137 sock_net_set(sk, get_net(net));
1138 atomic_set(&sk->sk_wmem_alloc, 1);
1139
1140 sock_update_classid(sk);
1141 }
1142
1143 return sk;
1144 }
1145 EXPORT_SYMBOL(sk_alloc);
1146
1147 static void __sk_free(struct sock *sk)
1148 {
1149 struct sk_filter *filter;
1150
1151 if (sk->sk_destruct)
1152 sk->sk_destruct(sk);
1153
1154 filter = rcu_dereference_check(sk->sk_filter,
1155 atomic_read(&sk->sk_wmem_alloc) == 0);
1156 if (filter) {
1157 sk_filter_uncharge(sk, filter);
1158 rcu_assign_pointer(sk->sk_filter, NULL);
1159 }
1160
1161 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1162 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1163
1164 if (atomic_read(&sk->sk_omem_alloc))
1165 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
1166 __func__, atomic_read(&sk->sk_omem_alloc));
1167
1168 if (sk->sk_peer_cred)
1169 put_cred(sk->sk_peer_cred);
1170 put_pid(sk->sk_peer_pid);
1171 put_net(sock_net(sk));
1172 sk_prot_free(sk->sk_prot_creator, sk);
1173 }
1174
1175 void sk_free(struct sock *sk)
1176 {
1177 /*
1178 * We subtract one from sk_wmem_alloc and can know if
1179 * some packets are still in some tx queue.
1180 * If not null, sock_wfree() will call __sk_free(sk) later
1181 */
1182 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1183 __sk_free(sk);
1184 }
1185 EXPORT_SYMBOL(sk_free);
1186
1187 /*
1188 * Last sock_put should drop reference to sk->sk_net. It has already
1189 * been dropped in sk_change_net. Taking reference to stopping namespace
1190 * is not an option.
1191 * Take reference to a socket to remove it from hash _alive_ and after that
1192 * destroy it in the context of init_net.
1193 */
1194 void sk_release_kernel(struct sock *sk)
1195 {
1196 if (sk == NULL || sk->sk_socket == NULL)
1197 return;
1198
1199 sock_hold(sk);
1200 sock_release(sk->sk_socket);
1201 release_net(sock_net(sk));
1202 sock_net_set(sk, get_net(&init_net));
1203 sock_put(sk);
1204 }
1205 EXPORT_SYMBOL(sk_release_kernel);
1206
1207 struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
1208 {
1209 struct sock *newsk;
1210
1211 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1212 if (newsk != NULL) {
1213 struct sk_filter *filter;
1214
1215 sock_copy(newsk, sk);
1216
1217 /* SANITY */
1218 get_net(sock_net(newsk));
1219 sk_node_init(&newsk->sk_node);
1220 sock_lock_init(newsk);
1221 bh_lock_sock(newsk);
1222 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1223 newsk->sk_backlog.len = 0;
1224
1225 atomic_set(&newsk->sk_rmem_alloc, 0);
1226 /*
1227 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1228 */
1229 atomic_set(&newsk->sk_wmem_alloc, 1);
1230 atomic_set(&newsk->sk_omem_alloc, 0);
1231 skb_queue_head_init(&newsk->sk_receive_queue);
1232 skb_queue_head_init(&newsk->sk_write_queue);
1233 #ifdef CONFIG_NET_DMA
1234 skb_queue_head_init(&newsk->sk_async_wait_queue);
1235 #endif
1236
1237 spin_lock_init(&newsk->sk_dst_lock);
1238 rwlock_init(&newsk->sk_callback_lock);
1239 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1240 af_callback_keys + newsk->sk_family,
1241 af_family_clock_key_strings[newsk->sk_family]);
1242
1243 newsk->sk_dst_cache = NULL;
1244 newsk->sk_wmem_queued = 0;
1245 newsk->sk_forward_alloc = 0;
1246 newsk->sk_send_head = NULL;
1247 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1248
1249 sock_reset_flag(newsk, SOCK_DONE);
1250 skb_queue_head_init(&newsk->sk_error_queue);
1251
1252 filter = rcu_dereference_protected(newsk->sk_filter, 1);
1253 if (filter != NULL)
1254 sk_filter_charge(newsk, filter);
1255
1256 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1257 /* It is still raw copy of parent, so invalidate
1258 * destructor and make plain sk_free() */
1259 newsk->sk_destruct = NULL;
1260 bh_unlock_sock(newsk);
1261 sk_free(newsk);
1262 newsk = NULL;
1263 goto out;
1264 }
1265
1266 newsk->sk_err = 0;
1267 newsk->sk_priority = 0;
1268 /*
1269 * Before updating sk_refcnt, we must commit prior changes to memory
1270 * (Documentation/RCU/rculist_nulls.txt for details)
1271 */
1272 smp_wmb();
1273 atomic_set(&newsk->sk_refcnt, 2);
1274
1275 /*
1276 * Increment the counter in the same struct proto as the master
1277 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1278 * is the same as sk->sk_prot->socks, as this field was copied
1279 * with memcpy).
1280 *
1281 * This _changes_ the previous behaviour, where
1282 * tcp_create_openreq_child always was incrementing the
1283 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1284 * to be taken into account in all callers. -acme
1285 */
1286 sk_refcnt_debug_inc(newsk);
1287 sk_set_socket(newsk, NULL);
1288 newsk->sk_wq = NULL;
1289
1290 if (newsk->sk_prot->sockets_allocated)
1291 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
1292
1293 if (sock_flag(newsk, SOCK_TIMESTAMP) ||
1294 sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1295 net_enable_timestamp();
1296 }
1297 out:
1298 return newsk;
1299 }
1300 EXPORT_SYMBOL_GPL(sk_clone);
1301
1302 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1303 {
1304 __sk_dst_set(sk, dst);
1305 sk->sk_route_caps = dst->dev->features;
1306 if (sk->sk_route_caps & NETIF_F_GSO)
1307 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1308 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1309 if (sk_can_gso(sk)) {
1310 if (dst->header_len) {
1311 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1312 } else {
1313 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1314 sk->sk_gso_max_size = dst->dev->gso_max_size;
1315 }
1316 }
1317 }
1318 EXPORT_SYMBOL_GPL(sk_setup_caps);
1319
1320 void __init sk_init(void)
1321 {
1322 if (totalram_pages <= 4096) {
1323 sysctl_wmem_max = 32767;
1324 sysctl_rmem_max = 32767;
1325 sysctl_wmem_default = 32767;
1326 sysctl_rmem_default = 32767;
1327 } else if (totalram_pages >= 131072) {
1328 sysctl_wmem_max = 131071;
1329 sysctl_rmem_max = 131071;
1330 }
1331 }
1332
1333 /*
1334 * Simple resource managers for sockets.
1335 */
1336
1337
1338 /*
1339 * Write buffer destructor automatically called from kfree_skb.
1340 */
1341 void sock_wfree(struct sk_buff *skb)
1342 {
1343 struct sock *sk = skb->sk;
1344 unsigned int len = skb->truesize;
1345
1346 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1347 /*
1348 * Keep a reference on sk_wmem_alloc, this will be released
1349 * after sk_write_space() call
1350 */
1351 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1352 sk->sk_write_space(sk);
1353 len = 1;
1354 }
1355 /*
1356 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1357 * could not do because of in-flight packets
1358 */
1359 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1360 __sk_free(sk);
1361 }
1362 EXPORT_SYMBOL(sock_wfree);
1363
1364 /*
1365 * Read buffer destructor automatically called from kfree_skb.
1366 */
1367 void sock_rfree(struct sk_buff *skb)
1368 {
1369 struct sock *sk = skb->sk;
1370 unsigned int len = skb->truesize;
1371
1372 atomic_sub(len, &sk->sk_rmem_alloc);
1373 sk_mem_uncharge(sk, len);
1374 }
1375 EXPORT_SYMBOL(sock_rfree);
1376
1377
1378 int sock_i_uid(struct sock *sk)
1379 {
1380 int uid;
1381
1382 read_lock_bh(&sk->sk_callback_lock);
1383 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1384 read_unlock_bh(&sk->sk_callback_lock);
1385 return uid;
1386 }
1387 EXPORT_SYMBOL(sock_i_uid);
1388
1389 unsigned long sock_i_ino(struct sock *sk)
1390 {
1391 unsigned long ino;
1392
1393 read_lock_bh(&sk->sk_callback_lock);
1394 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1395 read_unlock_bh(&sk->sk_callback_lock);
1396 return ino;
1397 }
1398 EXPORT_SYMBOL(sock_i_ino);
1399
1400 /*
1401 * Allocate a skb from the socket's send buffer.
1402 */
1403 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1404 gfp_t priority)
1405 {
1406 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1407 struct sk_buff *skb = alloc_skb(size, priority);
1408 if (skb) {
1409 skb_set_owner_w(skb, sk);
1410 return skb;
1411 }
1412 }
1413 return NULL;
1414 }
1415 EXPORT_SYMBOL(sock_wmalloc);
1416
1417 /*
1418 * Allocate a skb from the socket's receive buffer.
1419 */
1420 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1421 gfp_t priority)
1422 {
1423 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1424 struct sk_buff *skb = alloc_skb(size, priority);
1425 if (skb) {
1426 skb_set_owner_r(skb, sk);
1427 return skb;
1428 }
1429 }
1430 return NULL;
1431 }
1432
1433 /*
1434 * Allocate a memory block from the socket's option memory buffer.
1435 */
1436 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1437 {
1438 if ((unsigned)size <= sysctl_optmem_max &&
1439 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1440 void *mem;
1441 /* First do the add, to avoid the race if kmalloc
1442 * might sleep.
1443 */
1444 atomic_add(size, &sk->sk_omem_alloc);
1445 mem = kmalloc(size, priority);
1446 if (mem)
1447 return mem;
1448 atomic_sub(size, &sk->sk_omem_alloc);
1449 }
1450 return NULL;
1451 }
1452 EXPORT_SYMBOL(sock_kmalloc);
1453
1454 /*
1455 * Free an option memory block.
1456 */
1457 void sock_kfree_s(struct sock *sk, void *mem, int size)
1458 {
1459 kfree(mem);
1460 atomic_sub(size, &sk->sk_omem_alloc);
1461 }
1462 EXPORT_SYMBOL(sock_kfree_s);
1463
1464 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1465 I think, these locks should be removed for datagram sockets.
1466 */
1467 static long sock_wait_for_wmem(struct sock *sk, long timeo)
1468 {
1469 DEFINE_WAIT(wait);
1470
1471 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1472 for (;;) {
1473 if (!timeo)
1474 break;
1475 if (signal_pending(current))
1476 break;
1477 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1478 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1479 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1480 break;
1481 if (sk->sk_shutdown & SEND_SHUTDOWN)
1482 break;
1483 if (sk->sk_err)
1484 break;
1485 timeo = schedule_timeout(timeo);
1486 }
1487 finish_wait(sk_sleep(sk), &wait);
1488 return timeo;
1489 }
1490
1491
1492 /*
1493 * Generic send/receive buffer handlers
1494 */
1495
1496 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1497 unsigned long data_len, int noblock,
1498 int *errcode)
1499 {
1500 struct sk_buff *skb;
1501 gfp_t gfp_mask;
1502 long timeo;
1503 int err;
1504
1505 gfp_mask = sk->sk_allocation;
1506 if (gfp_mask & __GFP_WAIT)
1507 gfp_mask |= __GFP_REPEAT;
1508
1509 timeo = sock_sndtimeo(sk, noblock);
1510 while (1) {
1511 err = sock_error(sk);
1512 if (err != 0)
1513 goto failure;
1514
1515 err = -EPIPE;
1516 if (sk->sk_shutdown & SEND_SHUTDOWN)
1517 goto failure;
1518
1519 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1520 skb = alloc_skb(header_len, gfp_mask);
1521 if (skb) {
1522 int npages;
1523 int i;
1524
1525 /* No pages, we're done... */
1526 if (!data_len)
1527 break;
1528
1529 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1530 skb->truesize += data_len;
1531 skb_shinfo(skb)->nr_frags = npages;
1532 for (i = 0; i < npages; i++) {
1533 struct page *page;
1534 skb_frag_t *frag;
1535
1536 page = alloc_pages(sk->sk_allocation, 0);
1537 if (!page) {
1538 err = -ENOBUFS;
1539 skb_shinfo(skb)->nr_frags = i;
1540 kfree_skb(skb);
1541 goto failure;
1542 }
1543
1544 frag = &skb_shinfo(skb)->frags[i];
1545 frag->page = page;
1546 frag->page_offset = 0;
1547 frag->size = (data_len >= PAGE_SIZE ?
1548 PAGE_SIZE :
1549 data_len);
1550 data_len -= PAGE_SIZE;
1551 }
1552
1553 /* Full success... */
1554 break;
1555 }
1556 err = -ENOBUFS;
1557 goto failure;
1558 }
1559 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1560 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1561 err = -EAGAIN;
1562 if (!timeo)
1563 goto failure;
1564 if (signal_pending(current))
1565 goto interrupted;
1566 timeo = sock_wait_for_wmem(sk, timeo);
1567 }
1568
1569 skb_set_owner_w(skb, sk);
1570 return skb;
1571
1572 interrupted:
1573 err = sock_intr_errno(timeo);
1574 failure:
1575 *errcode = err;
1576 return NULL;
1577 }
1578 EXPORT_SYMBOL(sock_alloc_send_pskb);
1579
1580 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1581 int noblock, int *errcode)
1582 {
1583 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1584 }
1585 EXPORT_SYMBOL(sock_alloc_send_skb);
1586
1587 static void __lock_sock(struct sock *sk)
1588 __releases(&sk->sk_lock.slock)
1589 __acquires(&sk->sk_lock.slock)
1590 {
1591 DEFINE_WAIT(wait);
1592
1593 for (;;) {
1594 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1595 TASK_UNINTERRUPTIBLE);
1596 spin_unlock_bh(&sk->sk_lock.slock);
1597 schedule();
1598 spin_lock_bh(&sk->sk_lock.slock);
1599 if (!sock_owned_by_user(sk))
1600 break;
1601 }
1602 finish_wait(&sk->sk_lock.wq, &wait);
1603 }
1604
1605 static void __release_sock(struct sock *sk)
1606 __releases(&sk->sk_lock.slock)
1607 __acquires(&sk->sk_lock.slock)
1608 {
1609 struct sk_buff *skb = sk->sk_backlog.head;
1610
1611 do {
1612 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1613 bh_unlock_sock(sk);
1614
1615 do {
1616 struct sk_buff *next = skb->next;
1617
1618 WARN_ON_ONCE(skb_dst_is_noref(skb));
1619 skb->next = NULL;
1620 sk_backlog_rcv(sk, skb);
1621
1622 /*
1623 * We are in process context here with softirqs
1624 * disabled, use cond_resched_softirq() to preempt.
1625 * This is safe to do because we've taken the backlog
1626 * queue private:
1627 */
1628 cond_resched_softirq();
1629
1630 skb = next;
1631 } while (skb != NULL);
1632
1633 bh_lock_sock(sk);
1634 } while ((skb = sk->sk_backlog.head) != NULL);
1635
1636 /*
1637 * Doing the zeroing here guarantee we can not loop forever
1638 * while a wild producer attempts to flood us.
1639 */
1640 sk->sk_backlog.len = 0;
1641 }
1642
1643 /**
1644 * sk_wait_data - wait for data to arrive at sk_receive_queue
1645 * @sk: sock to wait on
1646 * @timeo: for how long
1647 *
1648 * Now socket state including sk->sk_err is changed only under lock,
1649 * hence we may omit checks after joining wait queue.
1650 * We check receive queue before schedule() only as optimization;
1651 * it is very likely that release_sock() added new data.
1652 */
1653 int sk_wait_data(struct sock *sk, long *timeo)
1654 {
1655 int rc;
1656 DEFINE_WAIT(wait);
1657
1658 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1659 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1660 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1661 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1662 finish_wait(sk_sleep(sk), &wait);
1663 return rc;
1664 }
1665 EXPORT_SYMBOL(sk_wait_data);
1666
1667 /**
1668 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1669 * @sk: socket
1670 * @size: memory size to allocate
1671 * @kind: allocation type
1672 *
1673 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1674 * rmem allocation. This function assumes that protocols which have
1675 * memory_pressure use sk_wmem_queued as write buffer accounting.
1676 */
1677 int __sk_mem_schedule(struct sock *sk, int size, int kind)
1678 {
1679 struct proto *prot = sk->sk_prot;
1680 int amt = sk_mem_pages(size);
1681 long allocated;
1682
1683 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1684 allocated = atomic_long_add_return(amt, prot->memory_allocated);
1685
1686 /* Under limit. */
1687 if (allocated <= prot->sysctl_mem[0]) {
1688 if (prot->memory_pressure && *prot->memory_pressure)
1689 *prot->memory_pressure = 0;
1690 return 1;
1691 }
1692
1693 /* Under pressure. */
1694 if (allocated > prot->sysctl_mem[1])
1695 if (prot->enter_memory_pressure)
1696 prot->enter_memory_pressure(sk);
1697
1698 /* Over hard limit. */
1699 if (allocated > prot->sysctl_mem[2])
1700 goto suppress_allocation;
1701
1702 /* guarantee minimum buffer size under pressure */
1703 if (kind == SK_MEM_RECV) {
1704 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1705 return 1;
1706 } else { /* SK_MEM_SEND */
1707 if (sk->sk_type == SOCK_STREAM) {
1708 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1709 return 1;
1710 } else if (atomic_read(&sk->sk_wmem_alloc) <
1711 prot->sysctl_wmem[0])
1712 return 1;
1713 }
1714
1715 if (prot->memory_pressure) {
1716 int alloc;
1717
1718 if (!*prot->memory_pressure)
1719 return 1;
1720 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1721 if (prot->sysctl_mem[2] > alloc *
1722 sk_mem_pages(sk->sk_wmem_queued +
1723 atomic_read(&sk->sk_rmem_alloc) +
1724 sk->sk_forward_alloc))
1725 return 1;
1726 }
1727
1728 suppress_allocation:
1729
1730 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1731 sk_stream_moderate_sndbuf(sk);
1732
1733 /* Fail only if socket is _under_ its sndbuf.
1734 * In this case we cannot block, so that we have to fail.
1735 */
1736 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1737 return 1;
1738 }
1739
1740 /* Alas. Undo changes. */
1741 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1742 atomic_long_sub(amt, prot->memory_allocated);
1743 return 0;
1744 }
1745 EXPORT_SYMBOL(__sk_mem_schedule);
1746
1747 /**
1748 * __sk_reclaim - reclaim memory_allocated
1749 * @sk: socket
1750 */
1751 void __sk_mem_reclaim(struct sock *sk)
1752 {
1753 struct proto *prot = sk->sk_prot;
1754
1755 atomic_long_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
1756 prot->memory_allocated);
1757 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1758
1759 if (prot->memory_pressure && *prot->memory_pressure &&
1760 (atomic_long_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1761 *prot->memory_pressure = 0;
1762 }
1763 EXPORT_SYMBOL(__sk_mem_reclaim);
1764
1765
1766 /*
1767 * Set of default routines for initialising struct proto_ops when
1768 * the protocol does not support a particular function. In certain
1769 * cases where it makes no sense for a protocol to have a "do nothing"
1770 * function, some default processing is provided.
1771 */
1772
1773 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1774 {
1775 return -EOPNOTSUPP;
1776 }
1777 EXPORT_SYMBOL(sock_no_bind);
1778
1779 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1780 int len, int flags)
1781 {
1782 return -EOPNOTSUPP;
1783 }
1784 EXPORT_SYMBOL(sock_no_connect);
1785
1786 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1787 {
1788 return -EOPNOTSUPP;
1789 }
1790 EXPORT_SYMBOL(sock_no_socketpair);
1791
1792 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1793 {
1794 return -EOPNOTSUPP;
1795 }
1796 EXPORT_SYMBOL(sock_no_accept);
1797
1798 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1799 int *len, int peer)
1800 {
1801 return -EOPNOTSUPP;
1802 }
1803 EXPORT_SYMBOL(sock_no_getname);
1804
1805 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1806 {
1807 return 0;
1808 }
1809 EXPORT_SYMBOL(sock_no_poll);
1810
1811 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1812 {
1813 return -EOPNOTSUPP;
1814 }
1815 EXPORT_SYMBOL(sock_no_ioctl);
1816
1817 int sock_no_listen(struct socket *sock, int backlog)
1818 {
1819 return -EOPNOTSUPP;
1820 }
1821 EXPORT_SYMBOL(sock_no_listen);
1822
1823 int sock_no_shutdown(struct socket *sock, int how)
1824 {
1825 return -EOPNOTSUPP;
1826 }
1827 EXPORT_SYMBOL(sock_no_shutdown);
1828
1829 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1830 char __user *optval, unsigned int optlen)
1831 {
1832 return -EOPNOTSUPP;
1833 }
1834 EXPORT_SYMBOL(sock_no_setsockopt);
1835
1836 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1837 char __user *optval, int __user *optlen)
1838 {
1839 return -EOPNOTSUPP;
1840 }
1841 EXPORT_SYMBOL(sock_no_getsockopt);
1842
1843 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1844 size_t len)
1845 {
1846 return -EOPNOTSUPP;
1847 }
1848 EXPORT_SYMBOL(sock_no_sendmsg);
1849
1850 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1851 size_t len, int flags)
1852 {
1853 return -EOPNOTSUPP;
1854 }
1855 EXPORT_SYMBOL(sock_no_recvmsg);
1856
1857 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1858 {
1859 /* Mirror missing mmap method error code */
1860 return -ENODEV;
1861 }
1862 EXPORT_SYMBOL(sock_no_mmap);
1863
1864 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1865 {
1866 ssize_t res;
1867 struct msghdr msg = {.msg_flags = flags};
1868 struct kvec iov;
1869 char *kaddr = kmap(page);
1870 iov.iov_base = kaddr + offset;
1871 iov.iov_len = size;
1872 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1873 kunmap(page);
1874 return res;
1875 }
1876 EXPORT_SYMBOL(sock_no_sendpage);
1877
1878 /*
1879 * Default Socket Callbacks
1880 */
1881
1882 static void sock_def_wakeup(struct sock *sk)
1883 {
1884 struct socket_wq *wq;
1885
1886 rcu_read_lock();
1887 wq = rcu_dereference(sk->sk_wq);
1888 if (wq_has_sleeper(wq))
1889 wake_up_interruptible_all(&wq->wait);
1890 rcu_read_unlock();
1891 }
1892
1893 static void sock_def_error_report(struct sock *sk)
1894 {
1895 struct socket_wq *wq;
1896
1897 rcu_read_lock();
1898 wq = rcu_dereference(sk->sk_wq);
1899 if (wq_has_sleeper(wq))
1900 wake_up_interruptible_poll(&wq->wait, POLLERR);
1901 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1902 rcu_read_unlock();
1903 }
1904
1905 static void sock_def_readable(struct sock *sk, int len)
1906 {
1907 struct socket_wq *wq;
1908
1909 rcu_read_lock();
1910 wq = rcu_dereference(sk->sk_wq);
1911 if (wq_has_sleeper(wq))
1912 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
1913 POLLRDNORM | POLLRDBAND);
1914 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1915 rcu_read_unlock();
1916 }
1917
1918 static void sock_def_write_space(struct sock *sk)
1919 {
1920 struct socket_wq *wq;
1921
1922 rcu_read_lock();
1923
1924 /* Do not wake up a writer until he can make "significant"
1925 * progress. --DaveM
1926 */
1927 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1928 wq = rcu_dereference(sk->sk_wq);
1929 if (wq_has_sleeper(wq))
1930 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1931 POLLWRNORM | POLLWRBAND);
1932
1933 /* Should agree with poll, otherwise some programs break */
1934 if (sock_writeable(sk))
1935 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1936 }
1937
1938 rcu_read_unlock();
1939 }
1940
1941 static void sock_def_destruct(struct sock *sk)
1942 {
1943 kfree(sk->sk_protinfo);
1944 }
1945
1946 void sk_send_sigurg(struct sock *sk)
1947 {
1948 if (sk->sk_socket && sk->sk_socket->file)
1949 if (send_sigurg(&sk->sk_socket->file->f_owner))
1950 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1951 }
1952 EXPORT_SYMBOL(sk_send_sigurg);
1953
1954 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1955 unsigned long expires)
1956 {
1957 if (!mod_timer(timer, expires))
1958 sock_hold(sk);
1959 }
1960 EXPORT_SYMBOL(sk_reset_timer);
1961
1962 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1963 {
1964 if (timer_pending(timer) && del_timer(timer))
1965 __sock_put(sk);
1966 }
1967 EXPORT_SYMBOL(sk_stop_timer);
1968
1969 void sock_init_data(struct socket *sock, struct sock *sk)
1970 {
1971 skb_queue_head_init(&sk->sk_receive_queue);
1972 skb_queue_head_init(&sk->sk_write_queue);
1973 skb_queue_head_init(&sk->sk_error_queue);
1974 #ifdef CONFIG_NET_DMA
1975 skb_queue_head_init(&sk->sk_async_wait_queue);
1976 #endif
1977
1978 sk->sk_send_head = NULL;
1979
1980 init_timer(&sk->sk_timer);
1981
1982 sk->sk_allocation = GFP_KERNEL;
1983 sk->sk_rcvbuf = sysctl_rmem_default;
1984 sk->sk_sndbuf = sysctl_wmem_default;
1985 sk->sk_state = TCP_CLOSE;
1986 sk_set_socket(sk, sock);
1987
1988 sock_set_flag(sk, SOCK_ZAPPED);
1989
1990 if (sock) {
1991 sk->sk_type = sock->type;
1992 sk->sk_wq = sock->wq;
1993 sock->sk = sk;
1994 } else
1995 sk->sk_wq = NULL;
1996
1997 spin_lock_init(&sk->sk_dst_lock);
1998 rwlock_init(&sk->sk_callback_lock);
1999 lockdep_set_class_and_name(&sk->sk_callback_lock,
2000 af_callback_keys + sk->sk_family,
2001 af_family_clock_key_strings[sk->sk_family]);
2002
2003 sk->sk_state_change = sock_def_wakeup;
2004 sk->sk_data_ready = sock_def_readable;
2005 sk->sk_write_space = sock_def_write_space;
2006 sk->sk_error_report = sock_def_error_report;
2007 sk->sk_destruct = sock_def_destruct;
2008
2009 sk->sk_sndmsg_page = NULL;
2010 sk->sk_sndmsg_off = 0;
2011
2012 sk->sk_peer_pid = NULL;
2013 sk->sk_peer_cred = NULL;
2014 sk->sk_write_pending = 0;
2015 sk->sk_rcvlowat = 1;
2016 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2017 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2018
2019 sk->sk_stamp = ktime_set(-1L, 0);
2020
2021 /*
2022 * Before updating sk_refcnt, we must commit prior changes to memory
2023 * (Documentation/RCU/rculist_nulls.txt for details)
2024 */
2025 smp_wmb();
2026 atomic_set(&sk->sk_refcnt, 1);
2027 atomic_set(&sk->sk_drops, 0);
2028 }
2029 EXPORT_SYMBOL(sock_init_data);
2030
2031 void lock_sock_nested(struct sock *sk, int subclass)
2032 {
2033 might_sleep();
2034 spin_lock_bh(&sk->sk_lock.slock);
2035 if (sk->sk_lock.owned)
2036 __lock_sock(sk);
2037 sk->sk_lock.owned = 1;
2038 spin_unlock(&sk->sk_lock.slock);
2039 /*
2040 * The sk_lock has mutex_lock() semantics here:
2041 */
2042 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2043 local_bh_enable();
2044 }
2045 EXPORT_SYMBOL(lock_sock_nested);
2046
2047 void release_sock(struct sock *sk)
2048 {
2049 /*
2050 * The sk_lock has mutex_unlock() semantics:
2051 */
2052 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2053
2054 spin_lock_bh(&sk->sk_lock.slock);
2055 if (sk->sk_backlog.tail)
2056 __release_sock(sk);
2057 sk->sk_lock.owned = 0;
2058 if (waitqueue_active(&sk->sk_lock.wq))
2059 wake_up(&sk->sk_lock.wq);
2060 spin_unlock_bh(&sk->sk_lock.slock);
2061 }
2062 EXPORT_SYMBOL(release_sock);
2063
2064 /**
2065 * lock_sock_fast - fast version of lock_sock
2066 * @sk: socket
2067 *
2068 * This version should be used for very small section, where process wont block
2069 * return false if fast path is taken
2070 * sk_lock.slock locked, owned = 0, BH disabled
2071 * return true if slow path is taken
2072 * sk_lock.slock unlocked, owned = 1, BH enabled
2073 */
2074 bool lock_sock_fast(struct sock *sk)
2075 {
2076 might_sleep();
2077 spin_lock_bh(&sk->sk_lock.slock);
2078
2079 if (!sk->sk_lock.owned)
2080 /*
2081 * Note : We must disable BH
2082 */
2083 return false;
2084
2085 __lock_sock(sk);
2086 sk->sk_lock.owned = 1;
2087 spin_unlock(&sk->sk_lock.slock);
2088 /*
2089 * The sk_lock has mutex_lock() semantics here:
2090 */
2091 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2092 local_bh_enable();
2093 return true;
2094 }
2095 EXPORT_SYMBOL(lock_sock_fast);
2096
2097 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2098 {
2099 struct timeval tv;
2100 if (!sock_flag(sk, SOCK_TIMESTAMP))
2101 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2102 tv = ktime_to_timeval(sk->sk_stamp);
2103 if (tv.tv_sec == -1)
2104 return -ENOENT;
2105 if (tv.tv_sec == 0) {
2106 sk->sk_stamp = ktime_get_real();
2107 tv = ktime_to_timeval(sk->sk_stamp);
2108 }
2109 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2110 }
2111 EXPORT_SYMBOL(sock_get_timestamp);
2112
2113 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2114 {
2115 struct timespec ts;
2116 if (!sock_flag(sk, SOCK_TIMESTAMP))
2117 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2118 ts = ktime_to_timespec(sk->sk_stamp);
2119 if (ts.tv_sec == -1)
2120 return -ENOENT;
2121 if (ts.tv_sec == 0) {
2122 sk->sk_stamp = ktime_get_real();
2123 ts = ktime_to_timespec(sk->sk_stamp);
2124 }
2125 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2126 }
2127 EXPORT_SYMBOL(sock_get_timestampns);
2128
2129 void sock_enable_timestamp(struct sock *sk, int flag)
2130 {
2131 if (!sock_flag(sk, flag)) {
2132 sock_set_flag(sk, flag);
2133 /*
2134 * we just set one of the two flags which require net
2135 * time stamping, but time stamping might have been on
2136 * already because of the other one
2137 */
2138 if (!sock_flag(sk,
2139 flag == SOCK_TIMESTAMP ?
2140 SOCK_TIMESTAMPING_RX_SOFTWARE :
2141 SOCK_TIMESTAMP))
2142 net_enable_timestamp();
2143 }
2144 }
2145
2146 /*
2147 * Get a socket option on an socket.
2148 *
2149 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2150 * asynchronous errors should be reported by getsockopt. We assume
2151 * this means if you specify SO_ERROR (otherwise whats the point of it).
2152 */
2153 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2154 char __user *optval, int __user *optlen)
2155 {
2156 struct sock *sk = sock->sk;
2157
2158 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2159 }
2160 EXPORT_SYMBOL(sock_common_getsockopt);
2161
2162 #ifdef CONFIG_COMPAT
2163 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2164 char __user *optval, int __user *optlen)
2165 {
2166 struct sock *sk = sock->sk;
2167
2168 if (sk->sk_prot->compat_getsockopt != NULL)
2169 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2170 optval, optlen);
2171 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2172 }
2173 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2174 #endif
2175
2176 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2177 struct msghdr *msg, size_t size, int flags)
2178 {
2179 struct sock *sk = sock->sk;
2180 int addr_len = 0;
2181 int err;
2182
2183 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2184 flags & ~MSG_DONTWAIT, &addr_len);
2185 if (err >= 0)
2186 msg->msg_namelen = addr_len;
2187 return err;
2188 }
2189 EXPORT_SYMBOL(sock_common_recvmsg);
2190
2191 /*
2192 * Set socket options on an inet socket.
2193 */
2194 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2195 char __user *optval, unsigned int optlen)
2196 {
2197 struct sock *sk = sock->sk;
2198
2199 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2200 }
2201 EXPORT_SYMBOL(sock_common_setsockopt);
2202
2203 #ifdef CONFIG_COMPAT
2204 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2205 char __user *optval, unsigned int optlen)
2206 {
2207 struct sock *sk = sock->sk;
2208
2209 if (sk->sk_prot->compat_setsockopt != NULL)
2210 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2211 optval, optlen);
2212 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2213 }
2214 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2215 #endif
2216
2217 void sk_common_release(struct sock *sk)
2218 {
2219 if (sk->sk_prot->destroy)
2220 sk->sk_prot->destroy(sk);
2221
2222 /*
2223 * Observation: when sock_common_release is called, processes have
2224 * no access to socket. But net still has.
2225 * Step one, detach it from networking:
2226 *
2227 * A. Remove from hash tables.
2228 */
2229
2230 sk->sk_prot->unhash(sk);
2231
2232 /*
2233 * In this point socket cannot receive new packets, but it is possible
2234 * that some packets are in flight because some CPU runs receiver and
2235 * did hash table lookup before we unhashed socket. They will achieve
2236 * receive queue and will be purged by socket destructor.
2237 *
2238 * Also we still have packets pending on receive queue and probably,
2239 * our own packets waiting in device queues. sock_destroy will drain
2240 * receive queue, but transmitted packets will delay socket destruction
2241 * until the last reference will be released.
2242 */
2243
2244 sock_orphan(sk);
2245
2246 xfrm_sk_free_policy(sk);
2247
2248 sk_refcnt_debug_release(sk);
2249 sock_put(sk);
2250 }
2251 EXPORT_SYMBOL(sk_common_release);
2252
2253 static DEFINE_RWLOCK(proto_list_lock);
2254 static LIST_HEAD(proto_list);
2255
2256 #ifdef CONFIG_PROC_FS
2257 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2258 struct prot_inuse {
2259 int val[PROTO_INUSE_NR];
2260 };
2261
2262 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2263
2264 #ifdef CONFIG_NET_NS
2265 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2266 {
2267 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2268 }
2269 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2270
2271 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2272 {
2273 int cpu, idx = prot->inuse_idx;
2274 int res = 0;
2275
2276 for_each_possible_cpu(cpu)
2277 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2278
2279 return res >= 0 ? res : 0;
2280 }
2281 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2282
2283 static int __net_init sock_inuse_init_net(struct net *net)
2284 {
2285 net->core.inuse = alloc_percpu(struct prot_inuse);
2286 return net->core.inuse ? 0 : -ENOMEM;
2287 }
2288
2289 static void __net_exit sock_inuse_exit_net(struct net *net)
2290 {
2291 free_percpu(net->core.inuse);
2292 }
2293
2294 static struct pernet_operations net_inuse_ops = {
2295 .init = sock_inuse_init_net,
2296 .exit = sock_inuse_exit_net,
2297 };
2298
2299 static __init int net_inuse_init(void)
2300 {
2301 if (register_pernet_subsys(&net_inuse_ops))
2302 panic("Cannot initialize net inuse counters");
2303
2304 return 0;
2305 }
2306
2307 core_initcall(net_inuse_init);
2308 #else
2309 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2310
2311 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2312 {
2313 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2314 }
2315 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2316
2317 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2318 {
2319 int cpu, idx = prot->inuse_idx;
2320 int res = 0;
2321
2322 for_each_possible_cpu(cpu)
2323 res += per_cpu(prot_inuse, cpu).val[idx];
2324
2325 return res >= 0 ? res : 0;
2326 }
2327 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2328 #endif
2329
2330 static void assign_proto_idx(struct proto *prot)
2331 {
2332 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2333
2334 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2335 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2336 return;
2337 }
2338
2339 set_bit(prot->inuse_idx, proto_inuse_idx);
2340 }
2341
2342 static void release_proto_idx(struct proto *prot)
2343 {
2344 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2345 clear_bit(prot->inuse_idx, proto_inuse_idx);
2346 }
2347 #else
2348 static inline void assign_proto_idx(struct proto *prot)
2349 {
2350 }
2351
2352 static inline void release_proto_idx(struct proto *prot)
2353 {
2354 }
2355 #endif
2356
2357 int proto_register(struct proto *prot, int alloc_slab)
2358 {
2359 if (alloc_slab) {
2360 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2361 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2362 NULL);
2363
2364 if (prot->slab == NULL) {
2365 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2366 prot->name);
2367 goto out;
2368 }
2369
2370 if (prot->rsk_prot != NULL) {
2371 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
2372 if (prot->rsk_prot->slab_name == NULL)
2373 goto out_free_sock_slab;
2374
2375 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2376 prot->rsk_prot->obj_size, 0,
2377 SLAB_HWCACHE_ALIGN, NULL);
2378
2379 if (prot->rsk_prot->slab == NULL) {
2380 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2381 prot->name);
2382 goto out_free_request_sock_slab_name;
2383 }
2384 }
2385
2386 if (prot->twsk_prot != NULL) {
2387 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2388
2389 if (prot->twsk_prot->twsk_slab_name == NULL)
2390 goto out_free_request_sock_slab;
2391
2392 prot->twsk_prot->twsk_slab =
2393 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2394 prot->twsk_prot->twsk_obj_size,
2395 0,
2396 SLAB_HWCACHE_ALIGN |
2397 prot->slab_flags,
2398 NULL);
2399 if (prot->twsk_prot->twsk_slab == NULL)
2400 goto out_free_timewait_sock_slab_name;
2401 }
2402 }
2403
2404 write_lock(&proto_list_lock);
2405 list_add(&prot->node, &proto_list);
2406 assign_proto_idx(prot);
2407 write_unlock(&proto_list_lock);
2408 return 0;
2409
2410 out_free_timewait_sock_slab_name:
2411 kfree(prot->twsk_prot->twsk_slab_name);
2412 out_free_request_sock_slab:
2413 if (prot->rsk_prot && prot->rsk_prot->slab) {
2414 kmem_cache_destroy(prot->rsk_prot->slab);
2415 prot->rsk_prot->slab = NULL;
2416 }
2417 out_free_request_sock_slab_name:
2418 if (prot->rsk_prot)
2419 kfree(prot->rsk_prot->slab_name);
2420 out_free_sock_slab:
2421 kmem_cache_destroy(prot->slab);
2422 prot->slab = NULL;
2423 out:
2424 return -ENOBUFS;
2425 }
2426 EXPORT_SYMBOL(proto_register);
2427
2428 void proto_unregister(struct proto *prot)
2429 {
2430 write_lock(&proto_list_lock);
2431 release_proto_idx(prot);
2432 list_del(&prot->node);
2433 write_unlock(&proto_list_lock);
2434
2435 if (prot->slab != NULL) {
2436 kmem_cache_destroy(prot->slab);
2437 prot->slab = NULL;
2438 }
2439
2440 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2441 kmem_cache_destroy(prot->rsk_prot->slab);
2442 kfree(prot->rsk_prot->slab_name);
2443 prot->rsk_prot->slab = NULL;
2444 }
2445
2446 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2447 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2448 kfree(prot->twsk_prot->twsk_slab_name);
2449 prot->twsk_prot->twsk_slab = NULL;
2450 }
2451 }
2452 EXPORT_SYMBOL(proto_unregister);
2453
2454 #ifdef CONFIG_PROC_FS
2455 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2456 __acquires(proto_list_lock)
2457 {
2458 read_lock(&proto_list_lock);
2459 return seq_list_start_head(&proto_list, *pos);
2460 }
2461
2462 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2463 {
2464 return seq_list_next(v, &proto_list, pos);
2465 }
2466
2467 static void proto_seq_stop(struct seq_file *seq, void *v)
2468 __releases(proto_list_lock)
2469 {
2470 read_unlock(&proto_list_lock);
2471 }
2472
2473 static char proto_method_implemented(const void *method)
2474 {
2475 return method == NULL ? 'n' : 'y';
2476 }
2477
2478 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2479 {
2480 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
2481 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2482 proto->name,
2483 proto->obj_size,
2484 sock_prot_inuse_get(seq_file_net(seq), proto),
2485 proto->memory_allocated != NULL ? atomic_long_read(proto->memory_allocated) : -1L,
2486 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2487 proto->max_header,
2488 proto->slab == NULL ? "no" : "yes",
2489 module_name(proto->owner),
2490 proto_method_implemented(proto->close),
2491 proto_method_implemented(proto->connect),
2492 proto_method_implemented(proto->disconnect),
2493 proto_method_implemented(proto->accept),
2494 proto_method_implemented(proto->ioctl),
2495 proto_method_implemented(proto->init),
2496 proto_method_implemented(proto->destroy),
2497 proto_method_implemented(proto->shutdown),
2498 proto_method_implemented(proto->setsockopt),
2499 proto_method_implemented(proto->getsockopt),
2500 proto_method_implemented(proto->sendmsg),
2501 proto_method_implemented(proto->recvmsg),
2502 proto_method_implemented(proto->sendpage),
2503 proto_method_implemented(proto->bind),
2504 proto_method_implemented(proto->backlog_rcv),
2505 proto_method_implemented(proto->hash),
2506 proto_method_implemented(proto->unhash),
2507 proto_method_implemented(proto->get_port),
2508 proto_method_implemented(proto->enter_memory_pressure));
2509 }
2510
2511 static int proto_seq_show(struct seq_file *seq, void *v)
2512 {
2513 if (v == &proto_list)
2514 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2515 "protocol",
2516 "size",
2517 "sockets",
2518 "memory",
2519 "press",
2520 "maxhdr",
2521 "slab",
2522 "module",
2523 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2524 else
2525 proto_seq_printf(seq, list_entry(v, struct proto, node));
2526 return 0;
2527 }
2528
2529 static const struct seq_operations proto_seq_ops = {
2530 .start = proto_seq_start,
2531 .next = proto_seq_next,
2532 .stop = proto_seq_stop,
2533 .show = proto_seq_show,
2534 };
2535
2536 static int proto_seq_open(struct inode *inode, struct file *file)
2537 {
2538 return seq_open_net(inode, file, &proto_seq_ops,
2539 sizeof(struct seq_net_private));
2540 }
2541
2542 static const struct file_operations proto_seq_fops = {
2543 .owner = THIS_MODULE,
2544 .open = proto_seq_open,
2545 .read = seq_read,
2546 .llseek = seq_lseek,
2547 .release = seq_release_net,
2548 };
2549
2550 static __net_init int proto_init_net(struct net *net)
2551 {
2552 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2553 return -ENOMEM;
2554
2555 return 0;
2556 }
2557
2558 static __net_exit void proto_exit_net(struct net *net)
2559 {
2560 proc_net_remove(net, "protocols");
2561 }
2562
2563
2564 static __net_initdata struct pernet_operations proto_net_ops = {
2565 .init = proto_init_net,
2566 .exit = proto_exit_net,
2567 };
2568
2569 static int __init proto_init(void)
2570 {
2571 return register_pernet_subsys(&proto_net_ops);
2572 }
2573
2574 subsys_initcall(proto_init);
2575
2576 #endif /* PROC_FS */
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree