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[NET]: network dev read_mostly
[deliverable/linux.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 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 *
02c30a84 12 * Authors: Ross Biro
1da177e4
LT		 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
4ec93edb 37 * code. The ACK stuff can wait and needs major
1da177e4
LT		 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
4fc268d2 94#include <linux/capability.h>
1da177e4
LT		 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>
1da177e4
LT		 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>
a1f8e7f7 114#include <linux/highmem.h>
1da177e4
LT		 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>
2e6599cb 122#include <net/request_sock.h>
1da177e4
LT		 123#include <net/sock.h>
124#include <net/xfrm.h>
125#include <linux/ipsec.h>
126
127#include <linux/filter.h>
128
129#ifdef CONFIG_INET
130#include <net/tcp.h>
131#endif
132
da21f24d
IM		 133/*
134 * Each address family might have different locking rules, so we have
135 * one slock key per address family:
136 */
a5b5bb9a
IM		 137static struct lock_class_key af_family_keys[AF_MAX];
138static struct lock_class_key af_family_slock_keys[AF_MAX];
139
140#ifdef CONFIG_DEBUG_LOCK_ALLOC
141/*
142 * Make lock validator output more readable. (we pre-construct these
143 * strings build-time, so that runtime initialization of socket
144 * locks is fast):
145 */
146static const char *af_family_key_strings[AF_MAX+1] = {
147 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
148 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
149 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
150 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
151 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
152 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
153 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
154 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
155 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
156 "sk_lock-27" , "sk_lock-28" , "sk_lock-29" ,
157 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-AF_MAX"
158};
159static const char *af_family_slock_key_strings[AF_MAX+1] = {
160 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
161 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
162 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
163 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
164 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
165 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
166 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
167 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" ,
168 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
169 "slock-27" , "slock-28" , "slock-29" ,
170 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_MAX"
171};
172#endif
da21f24d
IM		 173
174/*
175 * sk_callback_lock locking rules are per-address-family,
176 * so split the lock classes by using a per-AF key:
177 */
178static struct lock_class_key af_callback_keys[AF_MAX];
179
1da177e4
LT		 180/* Take into consideration the size of the struct sk_buff overhead in the
181 * determination of these values, since that is non-constant across
182 * platforms. This makes socket queueing behavior and performance
183 * not depend upon such differences.
184 */
185#define _SK_MEM_PACKETS 256
186#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
187#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
188#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
189
190/* Run time adjustable parameters. */
ab32ea5d
BH		 191__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
192__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
193__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
194__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4
LT		 195
196/* Maximal space eaten by iovec or ancilliary data plus some space */
ab32ea5d 197int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
1da177e4
LT		 198
199static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
200{
201 struct timeval tv;
202
203 if (optlen < sizeof(tv))
204 return -EINVAL;
205 if (copy_from_user(&tv, optval, sizeof(tv)))
206 return -EFAULT;
207
208 *timeo_p = MAX_SCHEDULE_TIMEOUT;
209 if (tv.tv_sec == 0 && tv.tv_usec == 0)
210 return 0;
211 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
212 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
213 return 0;
214}
215
216static void sock_warn_obsolete_bsdism(const char *name)
217{
218 static int warned;
219 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 220 if (strcmp(warncomm, current->comm) && warned < 5) {
221 strcpy(warncomm, current->comm);
1da177e4
LT		 222 printk(KERN_WARNING "process `%s' is using obsolete "
223 "%s SO_BSDCOMPAT\n", warncomm, name);
224 warned++;
225 }
226}
227
228static void sock_disable_timestamp(struct sock *sk)
4ec93edb
YH		 229{
230 if (sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 231 sock_reset_flag(sk, SOCK_TIMESTAMP);
232 net_disable_timestamp();
233 }
234}
235
236
f0088a50
DV		 237int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
238{
239 int err = 0;
240 int skb_len;
241
242 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
243 number of warnings when compiling with -W --ANK
244 */
245 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
246 (unsigned)sk->sk_rcvbuf) {
247 err = -ENOMEM;
248 goto out;
249 }
250
fda9ef5d 251 err = sk_filter(sk, skb);
f0088a50
DV		 252 if (err)
253 goto out;
254
255 skb->dev = NULL;
256 skb_set_owner_r(skb, sk);
257
258 /* Cache the SKB length before we tack it onto the receive
259 * queue. Once it is added it no longer belongs to us and
260 * may be freed by other threads of control pulling packets
261 * from the queue.
262 */
263 skb_len = skb->len;
264
265 skb_queue_tail(&sk->sk_receive_queue, skb);
266
267 if (!sock_flag(sk, SOCK_DEAD))
268 sk->sk_data_ready(sk, skb_len);
269out:
270 return err;
271}
272EXPORT_SYMBOL(sock_queue_rcv_skb);
273
58a5a7b9 274int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 275{
276 int rc = NET_RX_SUCCESS;
277
fda9ef5d 278 if (sk_filter(sk, skb))
f0088a50
DV		 279 goto discard_and_relse;
280
281 skb->dev = NULL;
282
58a5a7b9
ACM		 283 if (nested)
284 bh_lock_sock_nested(sk);
285 else
286 bh_lock_sock(sk);
a5b5bb9a
IM		 287 if (!sock_owned_by_user(sk)) {
288 /*
289 * trylock + unlock semantics:
290 */
291 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
292
f0088a50 293 rc = sk->sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 294
295 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
296 } else
f0088a50
DV		 297 sk_add_backlog(sk, skb);
298 bh_unlock_sock(sk);
299out:
300 sock_put(sk);
301 return rc;
302discard_and_relse:
303 kfree_skb(skb);
304 goto out;
305}
306EXPORT_SYMBOL(sk_receive_skb);
307
308struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
309{
310 struct dst_entry *dst = sk->sk_dst_cache;
311
312 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
313 sk->sk_dst_cache = NULL;
314 dst_release(dst);
315 return NULL;
316 }
317
318 return dst;
319}
320EXPORT_SYMBOL(__sk_dst_check);
321
322struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
323{
324 struct dst_entry *dst = sk_dst_get(sk);
325
326 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
327 sk_dst_reset(sk);
328 dst_release(dst);
329 return NULL;
330 }
331
332 return dst;
333}
334EXPORT_SYMBOL(sk_dst_check);
335
1da177e4
LT		 336/*
337 * This is meant for all protocols to use and covers goings on
338 * at the socket level. Everything here is generic.
339 */
340
341int sock_setsockopt(struct socket *sock, int level, int optname,
342 char __user *optval, int optlen)
343{
344 struct sock *sk=sock->sk;
345 struct sk_filter *filter;
346 int val;
347 int valbool;
348 struct linger ling;
349 int ret = 0;
4ec93edb 350
1da177e4
LT		 351 /*
352 * Options without arguments
353 */
354
355#ifdef SO_DONTLINGER /* Compatibility item... */
a77be819
KM		 356 if (optname == SO_DONTLINGER) {
357 lock_sock(sk);
358 sock_reset_flag(sk, SOCK_LINGER);
359 release_sock(sk);
360 return 0;
1da177e4 361 }
a77be819 362#endif
4ec93edb 363
e71a4783
SH		 364 if (optlen < sizeof(int))
365 return -EINVAL;
4ec93edb 366
1da177e4
LT		 367 if (get_user(val, (int __user *)optval))
368 return -EFAULT;
4ec93edb
YH		 369
370 valbool = val?1:0;
1da177e4
LT		 371
372 lock_sock(sk);
373
e71a4783
SH		 374 switch(optname) {
375 case SO_DEBUG:
376 if (val && !capable(CAP_NET_ADMIN)) {
377 ret = -EACCES;
378 }
379 else if (valbool)
380 sock_set_flag(sk, SOCK_DBG);
381 else
382 sock_reset_flag(sk, SOCK_DBG);
383 break;
384 case SO_REUSEADDR:
385 sk->sk_reuse = valbool;
386 break;
387 case SO_TYPE:
388 case SO_ERROR:
389 ret = -ENOPROTOOPT;
390 break;
391 case SO_DONTROUTE:
392 if (valbool)
393 sock_set_flag(sk, SOCK_LOCALROUTE);
394 else
395 sock_reset_flag(sk, SOCK_LOCALROUTE);
396 break;
397 case SO_BROADCAST:
398 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
399 break;
400 case SO_SNDBUF:
401 /* Don't error on this BSD doesn't and if you think
402 about it this is right. Otherwise apps have to
403 play 'guess the biggest size' games. RCVBUF/SNDBUF
404 are treated in BSD as hints */
405
406 if (val > sysctl_wmem_max)
407 val = sysctl_wmem_max;
b0573dea 408set_sndbuf:
e71a4783
SH		 409 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
410 if ((val * 2) < SOCK_MIN_SNDBUF)
411 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
412 else
413 sk->sk_sndbuf = val * 2;
1da177e4 414
e71a4783
SH		 415 /*
416 * Wake up sending tasks if we
417 * upped the value.
418 */
419 sk->sk_write_space(sk);
420 break;
1da177e4 421
e71a4783
SH		 422 case SO_SNDBUFFORCE:
423 if (!capable(CAP_NET_ADMIN)) {
424 ret = -EPERM;
425 break;
426 }
427 goto set_sndbuf;
b0573dea 428
e71a4783
SH		 429 case SO_RCVBUF:
430 /* Don't error on this BSD doesn't and if you think
431 about it this is right. Otherwise apps have to
432 play 'guess the biggest size' games. RCVBUF/SNDBUF
433 are treated in BSD as hints */
4ec93edb 434
e71a4783
SH		 435 if (val > sysctl_rmem_max)
436 val = sysctl_rmem_max;
b0573dea 437set_rcvbuf:
e71a4783
SH		 438 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
439 /*
440 * We double it on the way in to account for
441 * "struct sk_buff" etc. overhead. Applications
442 * assume that the SO_RCVBUF setting they make will
443 * allow that much actual data to be received on that
444 * socket.
445 *
446 * Applications are unaware that "struct sk_buff" and
447 * other overheads allocate from the receive buffer
448 * during socket buffer allocation.
449 *
450 * And after considering the possible alternatives,
451 * returning the value we actually used in getsockopt
452 * is the most desirable behavior.
453 */
454 if ((val * 2) < SOCK_MIN_RCVBUF)
455 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
456 else
457 sk->sk_rcvbuf = val * 2;
458 break;
459
460 case SO_RCVBUFFORCE:
461 if (!capable(CAP_NET_ADMIN)) {
462 ret = -EPERM;
1da177e4 463 break;
e71a4783
SH		 464 }
465 goto set_rcvbuf;
1da177e4 466
e71a4783 467 case SO_KEEPALIVE:
1da177e4 468#ifdef CONFIG_INET
e71a4783
SH		 469 if (sk->sk_protocol == IPPROTO_TCP)
470 tcp_set_keepalive(sk, valbool);
1da177e4 471#endif
e71a4783
SH		 472 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
473 break;
474
475 case SO_OOBINLINE:
476 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
477 break;
478
479 case SO_NO_CHECK:
480 sk->sk_no_check = valbool;
481 break;
482
483 case SO_PRIORITY:
484 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
485 sk->sk_priority = val;
486 else
487 ret = -EPERM;
488 break;
489
490 case SO_LINGER:
491 if (optlen < sizeof(ling)) {
492 ret = -EINVAL; /* 1003.1g */
1da177e4 493 break;
e71a4783
SH		 494 }
495 if (copy_from_user(&ling,optval,sizeof(ling))) {
496 ret = -EFAULT;
1da177e4 497 break;
e71a4783
SH		 498 }
499 if (!ling.l_onoff)
500 sock_reset_flag(sk, SOCK_LINGER);
501 else {
1da177e4 502#if (BITS_PER_LONG == 32)
e71a4783
SH		 503 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
504 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 505 else
e71a4783
SH		 506#endif
507 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
508 sock_set_flag(sk, SOCK_LINGER);
509 }
510 break;
511
512 case SO_BSDCOMPAT:
513 sock_warn_obsolete_bsdism("setsockopt");
514 break;
515
516 case SO_PASSCRED:
517 if (valbool)
518 set_bit(SOCK_PASSCRED, &sock->flags);
519 else
520 clear_bit(SOCK_PASSCRED, &sock->flags);
521 break;
522
523 case SO_TIMESTAMP:
92f37fd2 524 case SO_TIMESTAMPNS:
e71a4783 525 if (valbool) {
92f37fd2
ED		 526 if (optname == SO_TIMESTAMP)
527 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
528 else
529 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 530 sock_set_flag(sk, SOCK_RCVTSTAMP);
531 sock_enable_timestamp(sk);
92f37fd2 532 } else {
e71a4783 533 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 534 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
535 }
e71a4783
SH		 536 break;
537
538 case SO_RCVLOWAT:
539 if (val < 0)
540 val = INT_MAX;
541 sk->sk_rcvlowat = val ? : 1;
542 break;
543
544 case SO_RCVTIMEO:
545 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
546 break;
547
548 case SO_SNDTIMEO:
549 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
550 break;
1da177e4 551
e71a4783
SH		 552#ifdef CONFIG_NETDEVICES
553 case SO_BINDTODEVICE:
554 {
555 char devname[IFNAMSIZ];
1da177e4 556
e71a4783
SH		 557 /* Sorry... */
558 if (!capable(CAP_NET_RAW)) {
559 ret = -EPERM;
1da177e4 560 break;
e71a4783 561 }
1da177e4 562
e71a4783
SH		 563 /* Bind this socket to a particular device like "eth0",
564 * as specified in the passed interface name. If the
565 * name is "" or the option length is zero the socket
566 * is not bound.
567 */
1da177e4 568
e71a4783
SH		 569 if (!valbool) {
570 sk->sk_bound_dev_if = 0;
571 } else {
572 if (optlen > IFNAMSIZ - 1)
573 optlen = IFNAMSIZ - 1;
574 memset(devname, 0, sizeof(devname));
575 if (copy_from_user(devname, optval, optlen)) {
576 ret = -EFAULT;
1da177e4
LT		 577 break;
578 }
579
e71a4783
SH		 580 /* Remove any cached route for this socket. */
581 sk_dst_reset(sk);
1da177e4 582
e71a4783 583 if (devname[0] == '\0') {
1da177e4
LT		 584 sk->sk_bound_dev_if = 0;
585 } else {
e71a4783
SH		 586 struct net_device *dev = dev_get_by_name(devname);
587 if (!dev) {
588 ret = -ENODEV;
1da177e4
LT		 589 break;
590 }
e71a4783
SH		 591 sk->sk_bound_dev_if = dev->ifindex;
592 dev_put(dev);
1da177e4 593 }
1da177e4 594 }
e71a4783
SH		 595 break;
596 }
1da177e4
LT		 597#endif
598
599
e71a4783
SH		 600 case SO_ATTACH_FILTER:
601 ret = -EINVAL;
602 if (optlen == sizeof(struct sock_fprog)) {
603 struct sock_fprog fprog;
1da177e4 604
e71a4783
SH		 605 ret = -EFAULT;
606 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 607 break;
e71a4783
SH		 608
609 ret = sk_attach_filter(&fprog, sk);
610 }
611 break;
612
613 case SO_DETACH_FILTER:
614 rcu_read_lock_bh();
615 filter = rcu_dereference(sk->sk_filter);
616 if (filter) {
617 rcu_assign_pointer(sk->sk_filter, NULL);
618 sk_filter_release(sk, filter);
fda9ef5d 619 rcu_read_unlock_bh();
1da177e4 620 break;
e71a4783
SH		 621 }
622 rcu_read_unlock_bh();
623 ret = -ENONET;
624 break;
1da177e4 625
e71a4783
SH		 626 case SO_PASSSEC:
627 if (valbool)
628 set_bit(SOCK_PASSSEC, &sock->flags);
629 else
630 clear_bit(SOCK_PASSSEC, &sock->flags);
631 break;
877ce7c1 632
1da177e4
LT		 633 /* We implement the SO_SNDLOWAT etc to
634 not be settable (1003.1g 5.3) */
e71a4783
SH		 635 default:
636 ret = -ENOPROTOOPT;
637 break;
4ec93edb 638 }
1da177e4
LT		 639 release_sock(sk);
640 return ret;
641}
642
643
644int sock_getsockopt(struct socket *sock, int level, int optname,
645 char __user *optval, int __user *optlen)
646{
647 struct sock *sk = sock->sk;
4ec93edb 648
e71a4783 649 union {
4ec93edb
YH		 650 int val;
651 struct linger ling;
1da177e4
LT		 652 struct timeval tm;
653 } v;
4ec93edb 654
1da177e4
LT		 655 unsigned int lv = sizeof(int);
656 int len;
4ec93edb 657
e71a4783 658 if (get_user(len, optlen))
4ec93edb 659 return -EFAULT;
e71a4783 660 if (len < 0)
1da177e4 661 return -EINVAL;
4ec93edb 662
e71a4783
SH		 663 switch(optname) {
664 case SO_DEBUG:
665 v.val = sock_flag(sk, SOCK_DBG);
666 break;
667
668 case SO_DONTROUTE:
669 v.val = sock_flag(sk, SOCK_LOCALROUTE);
670 break;
671
672 case SO_BROADCAST:
673 v.val = !!sock_flag(sk, SOCK_BROADCAST);
674 break;
675
676 case SO_SNDBUF:
677 v.val = sk->sk_sndbuf;
678 break;
679
680 case SO_RCVBUF:
681 v.val = sk->sk_rcvbuf;
682 break;
683
684 case SO_REUSEADDR:
685 v.val = sk->sk_reuse;
686 break;
687
688 case SO_KEEPALIVE:
689 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
690 break;
691
692 case SO_TYPE:
693 v.val = sk->sk_type;
694 break;
695
696 case SO_ERROR:
697 v.val = -sock_error(sk);
698 if (v.val==0)
699 v.val = xchg(&sk->sk_err_soft, 0);
700 break;
701
702 case SO_OOBINLINE:
703 v.val = !!sock_flag(sk, SOCK_URGINLINE);
704 break;
705
706 case SO_NO_CHECK:
707 v.val = sk->sk_no_check;
708 break;
709
710 case SO_PRIORITY:
711 v.val = sk->sk_priority;
712 break;
713
714 case SO_LINGER:
715 lv = sizeof(v.ling);
716 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
717 v.ling.l_linger = sk->sk_lingertime / HZ;
718 break;
719
720 case SO_BSDCOMPAT:
721 sock_warn_obsolete_bsdism("getsockopt");
722 break;
723
724 case SO_TIMESTAMP:
92f37fd2
ED		 725 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
726 !sock_flag(sk, SOCK_RCVTSTAMPNS);
727 break;
728
729 case SO_TIMESTAMPNS:
730 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 731 break;
732
733 case SO_RCVTIMEO:
734 lv=sizeof(struct timeval);
735 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
736 v.tm.tv_sec = 0;
737 v.tm.tv_usec = 0;
738 } else {
739 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
740 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
741 }
742 break;
743
744 case SO_SNDTIMEO:
745 lv=sizeof(struct timeval);
746 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
747 v.tm.tv_sec = 0;
748 v.tm.tv_usec = 0;
749 } else {
750 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
751 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
752 }
753 break;
1da177e4 754
e71a4783
SH		 755 case SO_RCVLOWAT:
756 v.val = sk->sk_rcvlowat;
757 break;
1da177e4 758
e71a4783
SH		 759 case SO_SNDLOWAT:
760 v.val=1;
761 break;
1da177e4 762
e71a4783
SH		 763 case SO_PASSCRED:
764 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
765 break;
1da177e4 766
e71a4783
SH		 767 case SO_PEERCRED:
768 if (len > sizeof(sk->sk_peercred))
769 len = sizeof(sk->sk_peercred);
770 if (copy_to_user(optval, &sk->sk_peercred, len))
771 return -EFAULT;
772 goto lenout;
1da177e4 773
e71a4783
SH		 774 case SO_PEERNAME:
775 {
776 char address[128];
777
778 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
779 return -ENOTCONN;
780 if (lv < len)
781 return -EINVAL;
782 if (copy_to_user(optval, address, len))
783 return -EFAULT;
784 goto lenout;
785 }
1da177e4 786
e71a4783
SH		 787 /* Dubious BSD thing... Probably nobody even uses it, but
788 * the UNIX standard wants it for whatever reason... -DaveM
789 */
790 case SO_ACCEPTCONN:
791 v.val = sk->sk_state == TCP_LISTEN;
792 break;
1da177e4 793
e71a4783
SH		 794 case SO_PASSSEC:
795 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
796 break;
877ce7c1 797
e71a4783
SH		 798 case SO_PEERSEC:
799 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 800
e71a4783
SH		 801 default:
802 return -ENOPROTOOPT;
1da177e4 803 }
e71a4783 804
1da177e4
LT		 805 if (len > lv)
806 len = lv;
807 if (copy_to_user(optval, &v, len))
808 return -EFAULT;
809lenout:
4ec93edb
YH		 810 if (put_user(len, optlen))
811 return -EFAULT;
812 return 0;
1da177e4
LT		 813}
814
a5b5bb9a
IM		 815/*
816 * Initialize an sk_lock.
817 *
818 * (We also register the sk_lock with the lock validator.)
819 */
b6f99a21 820static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 821{
ed07536e
PZ		 822 sock_lock_init_class_and_name(sk,
823 af_family_slock_key_strings[sk->sk_family],
824 af_family_slock_keys + sk->sk_family,
825 af_family_key_strings[sk->sk_family],
826 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 827}
828
1da177e4
LT		 829/**
830 * sk_alloc - All socket objects are allocated here
4dc3b16b
PP		 831 * @family: protocol family
832 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
833 * @prot: struct proto associated with this new sock instance
834 * @zero_it: if we should zero the newly allocated sock
1da177e4 835 */
dd0fc66f 836struct sock *sk_alloc(int family, gfp_t priority,
86a76caf 837 struct proto *prot, int zero_it)
1da177e4
LT		 838{
839 struct sock *sk = NULL;
e18b890b 840 struct kmem_cache *slab = prot->slab;
1da177e4
LT		 841
842 if (slab != NULL)
843 sk = kmem_cache_alloc(slab, priority);
844 else
845 sk = kmalloc(prot->obj_size, priority);
846
847 if (sk) {
848 if (zero_it) {
849 memset(sk, 0, prot->obj_size);
850 sk->sk_family = family;
476e19cf
ACM		 851 /*
852 * See comment in struct sock definition to understand
853 * why we need sk_prot_creator -acme
854 */
855 sk->sk_prot = sk->sk_prot_creator = prot;
1da177e4
LT		 856 sock_lock_init(sk);
857 }
4ec93edb 858
a79af59e
FF		 859 if (security_sk_alloc(sk, family, priority))
860 goto out_free;
861
862 if (!try_module_get(prot->owner))
863 goto out_free;
1da177e4
LT		 864 }
865 return sk;
a79af59e
FF		 866
867out_free:
868 if (slab != NULL)
869 kmem_cache_free(slab, sk);
870 else
871 kfree(sk);
872 return NULL;
1da177e4
LT		 873}
874
875void sk_free(struct sock *sk)
876{
877 struct sk_filter *filter;
476e19cf 878 struct module *owner = sk->sk_prot_creator->owner;
1da177e4
LT		 879
880 if (sk->sk_destruct)
881 sk->sk_destruct(sk);
882
fda9ef5d 883 filter = rcu_dereference(sk->sk_filter);
1da177e4
LT		 884 if (filter) {
885 sk_filter_release(sk, filter);
fda9ef5d 886 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 887 }
888
889 sock_disable_timestamp(sk);
890
891 if (atomic_read(&sk->sk_omem_alloc))
892 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
893 __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
894
895 security_sk_free(sk);
476e19cf
ACM		 896 if (sk->sk_prot_creator->slab != NULL)
897 kmem_cache_free(sk->sk_prot_creator->slab, sk);
1da177e4
LT		 898 else
899 kfree(sk);
900 module_put(owner);
901}
902
dd0fc66f 903struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb
ACM		 904{
905 struct sock *newsk = sk_alloc(sk->sk_family, priority, sk->sk_prot, 0);
906
907 if (newsk != NULL) {
908 struct sk_filter *filter;
909
892c141e 910 sock_copy(newsk, sk);
87d11ceb
ACM		 911
912 /* SANITY */
913 sk_node_init(&newsk->sk_node);
914 sock_lock_init(newsk);
915 bh_lock_sock(newsk);
fa438ccf 916 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
87d11ceb
ACM		 917
918 atomic_set(&newsk->sk_rmem_alloc, 0);
919 atomic_set(&newsk->sk_wmem_alloc, 0);
920 atomic_set(&newsk->sk_omem_alloc, 0);
921 skb_queue_head_init(&newsk->sk_receive_queue);
922 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 923#ifdef CONFIG_NET_DMA
924 skb_queue_head_init(&newsk->sk_async_wait_queue);
925#endif
87d11ceb
ACM		 926
927 rwlock_init(&newsk->sk_dst_lock);
928 rwlock_init(&newsk->sk_callback_lock);
da21f24d
IM		 929 lockdep_set_class(&newsk->sk_callback_lock,
930 af_callback_keys + newsk->sk_family);
87d11ceb
ACM		 931
932 newsk->sk_dst_cache = NULL;
933 newsk->sk_wmem_queued = 0;
934 newsk->sk_forward_alloc = 0;
935 newsk->sk_send_head = NULL;
87d11ceb
ACM		 936 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
937
938 sock_reset_flag(newsk, SOCK_DONE);
939 skb_queue_head_init(&newsk->sk_error_queue);
940
941 filter = newsk->sk_filter;
942 if (filter != NULL)
943 sk_filter_charge(newsk, filter);
944
945 if (unlikely(xfrm_sk_clone_policy(newsk))) {
946 /* It is still raw copy of parent, so invalidate
947 * destructor and make plain sk_free() */
948 newsk->sk_destruct = NULL;
949 sk_free(newsk);
950 newsk = NULL;
951 goto out;
952 }
953
954 newsk->sk_err = 0;
955 newsk->sk_priority = 0;
956 atomic_set(&newsk->sk_refcnt, 2);
957
958 /*
959 * Increment the counter in the same struct proto as the master
960 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
961 * is the same as sk->sk_prot->socks, as this field was copied
962 * with memcpy).
963 *
964 * This _changes_ the previous behaviour, where
965 * tcp_create_openreq_child always was incrementing the
966 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
967 * to be taken into account in all callers. -acme
968 */
969 sk_refcnt_debug_inc(newsk);
970 newsk->sk_socket = NULL;
971 newsk->sk_sleep = NULL;
972
973 if (newsk->sk_prot->sockets_allocated)
974 atomic_inc(newsk->sk_prot->sockets_allocated);
975 }
976out:
977 return newsk;
978}
979
980EXPORT_SYMBOL_GPL(sk_clone);
981
1da177e4
LT		 982void __init sk_init(void)
983{
984 if (num_physpages <= 4096) {
985 sysctl_wmem_max = 32767;
986 sysctl_rmem_max = 32767;
987 sysctl_wmem_default = 32767;
988 sysctl_rmem_default = 32767;
989 } else if (num_physpages >= 131072) {
990 sysctl_wmem_max = 131071;
991 sysctl_rmem_max = 131071;
992 }
993}
994
995/*
996 * Simple resource managers for sockets.
997 */
998
999
4ec93edb
YH		 1000/*
1001 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1002 */
1003void sock_wfree(struct sk_buff *skb)
1004{
1005 struct sock *sk = skb->sk;
1006
1007 /* In case it might be waiting for more memory. */
1008 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1009 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1010 sk->sk_write_space(sk);
1011 sock_put(sk);
1012}
1013
4ec93edb
YH		 1014/*
1015 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1016 */
1017void sock_rfree(struct sk_buff *skb)
1018{
1019 struct sock *sk = skb->sk;
1020
1021 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1022}
1023
1024
1025int sock_i_uid(struct sock *sk)
1026{
1027 int uid;
1028
1029 read_lock(&sk->sk_callback_lock);
1030 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1031 read_unlock(&sk->sk_callback_lock);
1032 return uid;
1033}
1034
1035unsigned long sock_i_ino(struct sock *sk)
1036{
1037 unsigned long ino;
1038
1039 read_lock(&sk->sk_callback_lock);
1040 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1041 read_unlock(&sk->sk_callback_lock);
1042 return ino;
1043}
1044
1045/*
1046 * Allocate a skb from the socket's send buffer.
1047 */
86a76caf 1048struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1049 gfp_t priority)
1da177e4
LT		 1050{
1051 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1052 struct sk_buff * skb = alloc_skb(size, priority);
1053 if (skb) {
1054 skb_set_owner_w(skb, sk);
1055 return skb;
1056 }
1057 }
1058 return NULL;
1059}
1060
1061/*
1062 * Allocate a skb from the socket's receive buffer.
4ec93edb 1063 */
86a76caf 1064struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1065 gfp_t priority)
1da177e4
LT		 1066{
1067 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1068 struct sk_buff *skb = alloc_skb(size, priority);
1069 if (skb) {
1070 skb_set_owner_r(skb, sk);
1071 return skb;
1072 }
1073 }
1074 return NULL;
1075}
1076
4ec93edb 1077/*
1da177e4 1078 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1079 */
dd0fc66f 1080void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1081{
1082 if ((unsigned)size <= sysctl_optmem_max &&
1083 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1084 void *mem;
1085 /* First do the add, to avoid the race if kmalloc
4ec93edb 1086 * might sleep.
1da177e4
LT		 1087 */
1088 atomic_add(size, &sk->sk_omem_alloc);
1089 mem = kmalloc(size, priority);
1090 if (mem)
1091 return mem;
1092 atomic_sub(size, &sk->sk_omem_alloc);
1093 }
1094 return NULL;
1095}
1096
1097/*
1098 * Free an option memory block.
1099 */
1100void sock_kfree_s(struct sock *sk, void *mem, int size)
1101{
1102 kfree(mem);
1103 atomic_sub(size, &sk->sk_omem_alloc);
1104}
1105
1106/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1107 I think, these locks should be removed for datagram sockets.
1108 */
1109static long sock_wait_for_wmem(struct sock * sk, long timeo)
1110{
1111 DEFINE_WAIT(wait);
1112
1113 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1114 for (;;) {
1115 if (!timeo)
1116 break;
1117 if (signal_pending(current))
1118 break;
1119 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1120 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1121 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1122 break;
1123 if (sk->sk_shutdown & SEND_SHUTDOWN)
1124 break;
1125 if (sk->sk_err)
1126 break;
1127 timeo = schedule_timeout(timeo);
1128 }
1129 finish_wait(sk->sk_sleep, &wait);
1130 return timeo;
1131}
1132
1133
1134/*
1135 * Generic send/receive buffer handlers
1136 */
1137
1138static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1139 unsigned long header_len,
1140 unsigned long data_len,
1141 int noblock, int *errcode)
1142{
1143 struct sk_buff *skb;
7d877f3b 1144 gfp_t gfp_mask;
1da177e4
LT		 1145 long timeo;
1146 int err;
1147
1148 gfp_mask = sk->sk_allocation;
1149 if (gfp_mask & __GFP_WAIT)
1150 gfp_mask |= __GFP_REPEAT;
1151
1152 timeo = sock_sndtimeo(sk, noblock);
1153 while (1) {
1154 err = sock_error(sk);
1155 if (err != 0)
1156 goto failure;
1157
1158 err = -EPIPE;
1159 if (sk->sk_shutdown & SEND_SHUTDOWN)
1160 goto failure;
1161
1162 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1163 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1164 if (skb) {
1165 int npages;
1166 int i;
1167
1168 /* No pages, we're done... */
1169 if (!data_len)
1170 break;
1171
1172 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1173 skb->truesize += data_len;
1174 skb_shinfo(skb)->nr_frags = npages;
1175 for (i = 0; i < npages; i++) {
1176 struct page *page;
1177 skb_frag_t *frag;
1178
1179 page = alloc_pages(sk->sk_allocation, 0);
1180 if (!page) {
1181 err = -ENOBUFS;
1182 skb_shinfo(skb)->nr_frags = i;
1183 kfree_skb(skb);
1184 goto failure;
1185 }
1186
1187 frag = &skb_shinfo(skb)->frags[i];
1188 frag->page = page;
1189 frag->page_offset = 0;
1190 frag->size = (data_len >= PAGE_SIZE ?
1191 PAGE_SIZE :
1192 data_len);
1193 data_len -= PAGE_SIZE;
1194 }
1195
1196 /* Full success... */
1197 break;
1198 }
1199 err = -ENOBUFS;
1200 goto failure;
1201 }
1202 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1203 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1204 err = -EAGAIN;
1205 if (!timeo)
1206 goto failure;
1207 if (signal_pending(current))
1208 goto interrupted;
1209 timeo = sock_wait_for_wmem(sk, timeo);
1210 }
1211
1212 skb_set_owner_w(skb, sk);
1213 return skb;
1214
1215interrupted:
1216 err = sock_intr_errno(timeo);
1217failure:
1218 *errcode = err;
1219 return NULL;
1220}
1221
4ec93edb 1222struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1223 int noblock, int *errcode)
1224{
1225 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1226}
1227
1228static void __lock_sock(struct sock *sk)
1229{
1230 DEFINE_WAIT(wait);
1231
e71a4783 1232 for (;;) {
1da177e4
LT		 1233 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1234 TASK_UNINTERRUPTIBLE);
1235 spin_unlock_bh(&sk->sk_lock.slock);
1236 schedule();
1237 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1238 if (!sock_owned_by_user(sk))
1da177e4
LT		 1239 break;
1240 }
1241 finish_wait(&sk->sk_lock.wq, &wait);
1242}
1243
1244static void __release_sock(struct sock *sk)
1245{
1246 struct sk_buff *skb = sk->sk_backlog.head;
1247
1248 do {
1249 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1250 bh_unlock_sock(sk);
1251
1252 do {
1253 struct sk_buff *next = skb->next;
1254
1255 skb->next = NULL;
1256 sk->sk_backlog_rcv(sk, skb);
1257
1258 /*
1259 * We are in process context here with softirqs
1260 * disabled, use cond_resched_softirq() to preempt.
1261 * This is safe to do because we've taken the backlog
1262 * queue private:
1263 */
1264 cond_resched_softirq();
1265
1266 skb = next;
1267 } while (skb != NULL);
1268
1269 bh_lock_sock(sk);
e71a4783 1270 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1271}
1272
1273/**
1274 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1275 * @sk: sock to wait on
1276 * @timeo: for how long
1da177e4
LT		 1277 *
1278 * Now socket state including sk->sk_err is changed only under lock,
1279 * hence we may omit checks after joining wait queue.
1280 * We check receive queue before schedule() only as optimization;
1281 * it is very likely that release_sock() added new data.
1282 */
1283int sk_wait_data(struct sock *sk, long *timeo)
1284{
1285 int rc;
1286 DEFINE_WAIT(wait);
1287
1288 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1289 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1290 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1291 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1292 finish_wait(sk->sk_sleep, &wait);
1293 return rc;
1294}
1295
1296EXPORT_SYMBOL(sk_wait_data);
1297
1298/*
1299 * Set of default routines for initialising struct proto_ops when
1300 * the protocol does not support a particular function. In certain
1301 * cases where it makes no sense for a protocol to have a "do nothing"
1302 * function, some default processing is provided.
1303 */
1304
1305int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1306{
1307 return -EOPNOTSUPP;
1308}
1309
4ec93edb 1310int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1311 int len, int flags)
1312{
1313 return -EOPNOTSUPP;
1314}
1315
1316int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1317{
1318 return -EOPNOTSUPP;
1319}
1320
1321int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1322{
1323 return -EOPNOTSUPP;
1324}
1325
4ec93edb 1326int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1327 int *len, int peer)
1328{
1329 return -EOPNOTSUPP;
1330}
1331
1332unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1333{
1334 return 0;
1335}
1336
1337int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1338{
1339 return -EOPNOTSUPP;
1340}
1341
1342int sock_no_listen(struct socket *sock, int backlog)
1343{
1344 return -EOPNOTSUPP;
1345}
1346
1347int sock_no_shutdown(struct socket *sock, int how)
1348{
1349 return -EOPNOTSUPP;
1350}
1351
1352int sock_no_setsockopt(struct socket *sock, int level, int optname,
1353 char __user *optval, int optlen)
1354{
1355 return -EOPNOTSUPP;
1356}
1357
1358int sock_no_getsockopt(struct socket *sock, int level, int optname,
1359 char __user *optval, int __user *optlen)
1360{
1361 return -EOPNOTSUPP;
1362}
1363
1364int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1365 size_t len)
1366{
1367 return -EOPNOTSUPP;
1368}
1369
1370int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1371 size_t len, int flags)
1372{
1373 return -EOPNOTSUPP;
1374}
1375
1376int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1377{
1378 /* Mirror missing mmap method error code */
1379 return -ENODEV;
1380}
1381
1382ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1383{
1384 ssize_t res;
1385 struct msghdr msg = {.msg_flags = flags};
1386 struct kvec iov;
1387 char *kaddr = kmap(page);
1388 iov.iov_base = kaddr + offset;
1389 iov.iov_len = size;
1390 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1391 kunmap(page);
1392 return res;
1393}
1394
1395/*
1396 * Default Socket Callbacks
1397 */
1398
1399static void sock_def_wakeup(struct sock *sk)
1400{
1401 read_lock(&sk->sk_callback_lock);
1402 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1403 wake_up_interruptible_all(sk->sk_sleep);
1404 read_unlock(&sk->sk_callback_lock);
1405}
1406
1407static void sock_def_error_report(struct sock *sk)
1408{
1409 read_lock(&sk->sk_callback_lock);
1410 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1411 wake_up_interruptible(sk->sk_sleep);
4ec93edb 1412 sk_wake_async(sk,0,POLL_ERR);
1da177e4
LT		 1413 read_unlock(&sk->sk_callback_lock);
1414}
1415
1416static void sock_def_readable(struct sock *sk, int len)
1417{
1418 read_lock(&sk->sk_callback_lock);
1419 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1420 wake_up_interruptible(sk->sk_sleep);
1421 sk_wake_async(sk,1,POLL_IN);
1422 read_unlock(&sk->sk_callback_lock);
1423}
1424
1425static void sock_def_write_space(struct sock *sk)
1426{
1427 read_lock(&sk->sk_callback_lock);
1428
1429 /* Do not wake up a writer until he can make "significant"
1430 * progress. --DaveM
1431 */
e71a4783 1432 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1da177e4
LT		 1433 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1434 wake_up_interruptible(sk->sk_sleep);
1435
1436 /* Should agree with poll, otherwise some programs break */
1437 if (sock_writeable(sk))
1438 sk_wake_async(sk, 2, POLL_OUT);
1439 }
1440
1441 read_unlock(&sk->sk_callback_lock);
1442}
1443
1444static void sock_def_destruct(struct sock *sk)
1445{
a51482bd 1446 kfree(sk->sk_protinfo);
1da177e4
LT		 1447}
1448
1449void sk_send_sigurg(struct sock *sk)
1450{
1451 if (sk->sk_socket && sk->sk_socket->file)
1452 if (send_sigurg(&sk->sk_socket->file->f_owner))
1453 sk_wake_async(sk, 3, POLL_PRI);
1454}
1455
1456void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1457 unsigned long expires)
1458{
1459 if (!mod_timer(timer, expires))
1460 sock_hold(sk);
1461}
1462
1463EXPORT_SYMBOL(sk_reset_timer);
1464
1465void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1466{
1467 if (timer_pending(timer) && del_timer(timer))
1468 __sock_put(sk);
1469}
1470
1471EXPORT_SYMBOL(sk_stop_timer);
1472
1473void sock_init_data(struct socket *sock, struct sock *sk)
1474{
1475 skb_queue_head_init(&sk->sk_receive_queue);
1476 skb_queue_head_init(&sk->sk_write_queue);
1477 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1478#ifdef CONFIG_NET_DMA
1479 skb_queue_head_init(&sk->sk_async_wait_queue);
1480#endif
1da177e4
LT		 1481
1482 sk->sk_send_head = NULL;
1483
1484 init_timer(&sk->sk_timer);
4ec93edb 1485
1da177e4
LT		 1486 sk->sk_allocation = GFP_KERNEL;
1487 sk->sk_rcvbuf = sysctl_rmem_default;
1488 sk->sk_sndbuf = sysctl_wmem_default;
1489 sk->sk_state = TCP_CLOSE;
1490 sk->sk_socket = sock;
1491
1492 sock_set_flag(sk, SOCK_ZAPPED);
1493
e71a4783 1494 if (sock) {
1da177e4
LT		 1495 sk->sk_type = sock->type;
1496 sk->sk_sleep = &sock->wait;
1497 sock->sk = sk;
1498 } else
1499 sk->sk_sleep = NULL;
1500
1501 rwlock_init(&sk->sk_dst_lock);
1502 rwlock_init(&sk->sk_callback_lock);
da21f24d
IM		 1503 lockdep_set_class(&sk->sk_callback_lock,
1504 af_callback_keys + sk->sk_family);
1da177e4
LT		 1505
1506 sk->sk_state_change = sock_def_wakeup;
1507 sk->sk_data_ready = sock_def_readable;
1508 sk->sk_write_space = sock_def_write_space;
1509 sk->sk_error_report = sock_def_error_report;
1510 sk->sk_destruct = sock_def_destruct;
1511
1512 sk->sk_sndmsg_page = NULL;
1513 sk->sk_sndmsg_off = 0;
1514
1515 sk->sk_peercred.pid = 0;
1516 sk->sk_peercred.uid = -1;
1517 sk->sk_peercred.gid = -1;
1518 sk->sk_write_pending = 0;
1519 sk->sk_rcvlowat = 1;
1520 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1521 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1522
b7aa0bf7 1523 sk->sk_stamp = ktime_set(-1L, -1L);
1da177e4
LT		 1524
1525 atomic_set(&sk->sk_refcnt, 1);
1526}
1527
fcc70d5f 1528void fastcall lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1529{
1530 might_sleep();
a5b5bb9a 1531 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1532 if (sk->sk_lock.owner)
1533 __lock_sock(sk);
1534 sk->sk_lock.owner = (void *)1;
a5b5bb9a
IM		 1535 spin_unlock(&sk->sk_lock.slock);
1536 /*
1537 * The sk_lock has mutex_lock() semantics here:
1538 */
fcc70d5f 1539 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1540 local_bh_enable();
1da177e4
LT		 1541}
1542
fcc70d5f 1543EXPORT_SYMBOL(lock_sock_nested);
1da177e4
LT		 1544
1545void fastcall release_sock(struct sock *sk)
1546{
a5b5bb9a
IM		 1547 /*
1548 * The sk_lock has mutex_unlock() semantics:
1549 */
1550 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1551
1552 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1553 if (sk->sk_backlog.tail)
1554 __release_sock(sk);
1555 sk->sk_lock.owner = NULL;
a5b5bb9a
IM		 1556 if (waitqueue_active(&sk->sk_lock.wq))
1557 wake_up(&sk->sk_lock.wq);
1558 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1559}
1560EXPORT_SYMBOL(release_sock);
1561
1562int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1563{
b7aa0bf7 1564 struct timeval tv;
1da177e4
LT		 1565 if (!sock_flag(sk, SOCK_TIMESTAMP))
1566 sock_enable_timestamp(sk);
b7aa0bf7
ED		 1567 tv = ktime_to_timeval(sk->sk_stamp);
1568 if (tv.tv_sec == -1)
1da177e4 1569 return -ENOENT;
b7aa0bf7
ED		 1570 if (tv.tv_sec == 0) {
1571 sk->sk_stamp = ktime_get_real();
1572 tv = ktime_to_timeval(sk->sk_stamp);
1573 }
1574 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1575}
1da177e4
LT		 1576EXPORT_SYMBOL(sock_get_timestamp);
1577
ae40eb1e
ED		 1578int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1579{
1580 struct timespec ts;
1581 if (!sock_flag(sk, SOCK_TIMESTAMP))
1582 sock_enable_timestamp(sk);
1583 ts = ktime_to_timespec(sk->sk_stamp);
1584 if (ts.tv_sec == -1)
1585 return -ENOENT;
1586 if (ts.tv_sec == 0) {
1587 sk->sk_stamp = ktime_get_real();
1588 ts = ktime_to_timespec(sk->sk_stamp);
1589 }
1590 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1591}
1592EXPORT_SYMBOL(sock_get_timestampns);
1593
1da177e4 1594void sock_enable_timestamp(struct sock *sk)
4ec93edb
YH		 1595{
1596 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 1597 sock_set_flag(sk, SOCK_TIMESTAMP);
1598 net_enable_timestamp();
1599 }
1600}
4ec93edb 1601EXPORT_SYMBOL(sock_enable_timestamp);
1da177e4
LT		 1602
1603/*
1604 * Get a socket option on an socket.
1605 *
1606 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1607 * asynchronous errors should be reported by getsockopt. We assume
1608 * this means if you specify SO_ERROR (otherwise whats the point of it).
1609 */
1610int sock_common_getsockopt(struct socket *sock, int level, int optname,
1611 char __user *optval, int __user *optlen)
1612{
1613 struct sock *sk = sock->sk;
1614
1615 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1616}
1617
1618EXPORT_SYMBOL(sock_common_getsockopt);
1619
3fdadf7d 1620#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1621int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1622 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1623{
1624 struct sock *sk = sock->sk;
1625
1e51f951 1626 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 1627 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1628 optval, optlen);
3fdadf7d
DM		 1629 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1630}
1631EXPORT_SYMBOL(compat_sock_common_getsockopt);
1632#endif
1633
1da177e4
LT		 1634int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1635 struct msghdr *msg, size_t size, int flags)
1636{
1637 struct sock *sk = sock->sk;
1638 int addr_len = 0;
1639 int err;
1640
1641 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1642 flags & ~MSG_DONTWAIT, &addr_len);
1643 if (err >= 0)
1644 msg->msg_namelen = addr_len;
1645 return err;
1646}
1647
1648EXPORT_SYMBOL(sock_common_recvmsg);
1649
1650/*
1651 * Set socket options on an inet socket.
1652 */
1653int sock_common_setsockopt(struct socket *sock, int level, int optname,
1654 char __user *optval, int optlen)
1655{
1656 struct sock *sk = sock->sk;
1657
1658 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1659}
1660
1661EXPORT_SYMBOL(sock_common_setsockopt);
1662
3fdadf7d 1663#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1664int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1665 char __user *optval, int optlen)
3fdadf7d
DM		 1666{
1667 struct sock *sk = sock->sk;
1668
543d9cfe
ACM		 1669 if (sk->sk_prot->compat_setsockopt != NULL)
1670 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1671 optval, optlen);
3fdadf7d
DM		 1672 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1673}
1674EXPORT_SYMBOL(compat_sock_common_setsockopt);
1675#endif
1676
1da177e4
LT		 1677void sk_common_release(struct sock *sk)
1678{
1679 if (sk->sk_prot->destroy)
1680 sk->sk_prot->destroy(sk);
1681
1682 /*
1683 * Observation: when sock_common_release is called, processes have
1684 * no access to socket. But net still has.
1685 * Step one, detach it from networking:
1686 *
1687 * A. Remove from hash tables.
1688 */
1689
1690 sk->sk_prot->unhash(sk);
1691
1692 /*
1693 * In this point socket cannot receive new packets, but it is possible
1694 * that some packets are in flight because some CPU runs receiver and
1695 * did hash table lookup before we unhashed socket. They will achieve
1696 * receive queue and will be purged by socket destructor.
1697 *
1698 * Also we still have packets pending on receive queue and probably,
1699 * our own packets waiting in device queues. sock_destroy will drain
1700 * receive queue, but transmitted packets will delay socket destruction
1701 * until the last reference will be released.
1702 */
1703
1704 sock_orphan(sk);
1705
1706 xfrm_sk_free_policy(sk);
1707
e6848976 1708 sk_refcnt_debug_release(sk);
1da177e4
LT		 1709 sock_put(sk);
1710}
1711
1712EXPORT_SYMBOL(sk_common_release);
1713
1714static DEFINE_RWLOCK(proto_list_lock);
1715static LIST_HEAD(proto_list);
1716
1717int proto_register(struct proto *prot, int alloc_slab)
1718{
8feaf0c0
ACM		 1719 char *request_sock_slab_name = NULL;
1720 char *timewait_sock_slab_name;
1da177e4
LT		 1721 int rc = -ENOBUFS;
1722
1da177e4
LT		 1723 if (alloc_slab) {
1724 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
1725 SLAB_HWCACHE_ALIGN, NULL, NULL);
1726
1727 if (prot->slab == NULL) {
1728 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
1729 prot->name);
2a278051 1730 goto out;
1da177e4 1731 }
2e6599cb
ACM		 1732
1733 if (prot->rsk_prot != NULL) {
1734 static const char mask[] = "request_sock_%s";
1735
1736 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1737 if (request_sock_slab_name == NULL)
1738 goto out_free_sock_slab;
1739
1740 sprintf(request_sock_slab_name, mask, prot->name);
1741 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
1742 prot->rsk_prot->obj_size, 0,
1743 SLAB_HWCACHE_ALIGN, NULL, NULL);
1744
1745 if (prot->rsk_prot->slab == NULL) {
1746 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
1747 prot->name);
1748 goto out_free_request_sock_slab_name;
1749 }
1750 }
8feaf0c0 1751
6d6ee43e 1752 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 1753 static const char mask[] = "tw_sock_%s";
1754
1755 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1756
1757 if (timewait_sock_slab_name == NULL)
1758 goto out_free_request_sock_slab;
1759
1760 sprintf(timewait_sock_slab_name, mask, prot->name);
6d6ee43e
ACM		 1761 prot->twsk_prot->twsk_slab =
1762 kmem_cache_create(timewait_sock_slab_name,
1763 prot->twsk_prot->twsk_obj_size,
1764 0, SLAB_HWCACHE_ALIGN,
1765 NULL, NULL);
1766 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 1767 goto out_free_timewait_sock_slab_name;
1768 }
1da177e4
LT		 1769 }
1770
2a278051 1771 write_lock(&proto_list_lock);
1da177e4 1772 list_add(&prot->node, &proto_list);
1da177e4 1773 write_unlock(&proto_list_lock);
2a278051
ACM		 1774 rc = 0;
1775out:
1da177e4 1776 return rc;
8feaf0c0
ACM		 1777out_free_timewait_sock_slab_name:
1778 kfree(timewait_sock_slab_name);
1779out_free_request_sock_slab:
1780 if (prot->rsk_prot && prot->rsk_prot->slab) {
1781 kmem_cache_destroy(prot->rsk_prot->slab);
1782 prot->rsk_prot->slab = NULL;
1783 }
2e6599cb
ACM		 1784out_free_request_sock_slab_name:
1785 kfree(request_sock_slab_name);
1786out_free_sock_slab:
1787 kmem_cache_destroy(prot->slab);
1788 prot->slab = NULL;
1789 goto out;
1da177e4
LT		 1790}
1791
1792EXPORT_SYMBOL(proto_register);
1793
1794void proto_unregister(struct proto *prot)
1795{
1796 write_lock(&proto_list_lock);
0a3f4358
PM		 1797 list_del(&prot->node);
1798 write_unlock(&proto_list_lock);
1da177e4
LT		 1799
1800 if (prot->slab != NULL) {
1801 kmem_cache_destroy(prot->slab);
1802 prot->slab = NULL;
1803 }
1804
2e6599cb
ACM		 1805 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
1806 const char *name = kmem_cache_name(prot->rsk_prot->slab);
1807
1808 kmem_cache_destroy(prot->rsk_prot->slab);
1809 kfree(name);
1810 prot->rsk_prot->slab = NULL;
1811 }
1812
6d6ee43e
ACM		 1813 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
1814 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
8feaf0c0 1815
6d6ee43e 1816 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
8feaf0c0 1817 kfree(name);
6d6ee43e 1818 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 1819 }
1da177e4
LT		 1820}
1821
1822EXPORT_SYMBOL(proto_unregister);
1823
1824#ifdef CONFIG_PROC_FS
1825static inline struct proto *__proto_head(void)
1826{
1827 return list_entry(proto_list.next, struct proto, node);
1828}
1829
1830static inline struct proto *proto_head(void)
1831{
1832 return list_empty(&proto_list) ? NULL : __proto_head();
1833}
1834
1835static inline struct proto *proto_next(struct proto *proto)
1836{
1837 return proto->node.next == &proto_list ? NULL :
1838 list_entry(proto->node.next, struct proto, node);
1839}
1840
1841static inline struct proto *proto_get_idx(loff_t pos)
1842{
1843 struct proto *proto;
1844 loff_t i = 0;
1845
1846 list_for_each_entry(proto, &proto_list, node)
1847 if (i++ == pos)
1848 goto out;
1849
1850 proto = NULL;
1851out:
1852 return proto;
1853}
1854
1855static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
1856{
1857 read_lock(&proto_list_lock);
1858 return *pos ? proto_get_idx(*pos - 1) : SEQ_START_TOKEN;
1859}
1860
1861static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1862{
1863 ++*pos;
1864 return v == SEQ_START_TOKEN ? proto_head() : proto_next(v);
1865}
1866
1867static void proto_seq_stop(struct seq_file *seq, void *v)
1868{
1869 read_unlock(&proto_list_lock);
1870}
1871
1872static char proto_method_implemented(const void *method)
1873{
1874 return method == NULL ? 'n' : 'y';
1875}
1876
1877static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
1878{
1879 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
1880 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
1881 proto->name,
1882 proto->obj_size,
1883 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
1884 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
1885 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
1886 proto->max_header,
1887 proto->slab == NULL ? "no" : "yes",
1888 module_name(proto->owner),
1889 proto_method_implemented(proto->close),
1890 proto_method_implemented(proto->connect),
1891 proto_method_implemented(proto->disconnect),
1892 proto_method_implemented(proto->accept),
1893 proto_method_implemented(proto->ioctl),
1894 proto_method_implemented(proto->init),
1895 proto_method_implemented(proto->destroy),
1896 proto_method_implemented(proto->shutdown),
1897 proto_method_implemented(proto->setsockopt),
1898 proto_method_implemented(proto->getsockopt),
1899 proto_method_implemented(proto->sendmsg),
1900 proto_method_implemented(proto->recvmsg),
1901 proto_method_implemented(proto->sendpage),
1902 proto_method_implemented(proto->bind),
1903 proto_method_implemented(proto->backlog_rcv),
1904 proto_method_implemented(proto->hash),
1905 proto_method_implemented(proto->unhash),
1906 proto_method_implemented(proto->get_port),
1907 proto_method_implemented(proto->enter_memory_pressure));
1908}
1909
1910static int proto_seq_show(struct seq_file *seq, void *v)
1911{
1912 if (v == SEQ_START_TOKEN)
1913 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
1914 "protocol",
1915 "size",
1916 "sockets",
1917 "memory",
1918 "press",
1919 "maxhdr",
1920 "slab",
1921 "module",
1922 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
1923 else
1924 proto_seq_printf(seq, v);
1925 return 0;
1926}
1927
1928static struct seq_operations proto_seq_ops = {
1929 .start = proto_seq_start,
1930 .next = proto_seq_next,
1931 .stop = proto_seq_stop,
1932 .show = proto_seq_show,
1933};
1934
1935static int proto_seq_open(struct inode *inode, struct file *file)
1936{
1937 return seq_open(file, &proto_seq_ops);
1938}
1939
9a32144e 1940static const struct file_operations proto_seq_fops = {
1da177e4
LT		 1941 .owner = THIS_MODULE,
1942 .open = proto_seq_open,
1943 .read = seq_read,
1944 .llseek = seq_lseek,
1945 .release = seq_release,
1946};
1947
1948static int __init proto_init(void)
1949{
1950 /* register /proc/net/protocols */
1951 return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
1952}
1953
1954subsys_initcall(proto_init);
1955
1956#endif /* PROC_FS */
1957
1958EXPORT_SYMBOL(sk_alloc);
1959EXPORT_SYMBOL(sk_free);
1960EXPORT_SYMBOL(sk_send_sigurg);
1961EXPORT_SYMBOL(sock_alloc_send_skb);
1962EXPORT_SYMBOL(sock_init_data);
1963EXPORT_SYMBOL(sock_kfree_s);
1964EXPORT_SYMBOL(sock_kmalloc);
1965EXPORT_SYMBOL(sock_no_accept);
1966EXPORT_SYMBOL(sock_no_bind);
1967EXPORT_SYMBOL(sock_no_connect);
1968EXPORT_SYMBOL(sock_no_getname);
1969EXPORT_SYMBOL(sock_no_getsockopt);
1970EXPORT_SYMBOL(sock_no_ioctl);
1971EXPORT_SYMBOL(sock_no_listen);
1972EXPORT_SYMBOL(sock_no_mmap);
1973EXPORT_SYMBOL(sock_no_poll);
1974EXPORT_SYMBOL(sock_no_recvmsg);
1975EXPORT_SYMBOL(sock_no_sendmsg);
1976EXPORT_SYMBOL(sock_no_sendpage);
1977EXPORT_SYMBOL(sock_no_setsockopt);
1978EXPORT_SYMBOL(sock_no_shutdown);
1979EXPORT_SYMBOL(sock_no_socketpair);
1980EXPORT_SYMBOL(sock_rfree);
1981EXPORT_SYMBOL(sock_setsockopt);
1982EXPORT_SYMBOL(sock_wfree);
1983EXPORT_SYMBOL(sock_wmalloc);
1984EXPORT_SYMBOL(sock_i_uid);
1985EXPORT_SYMBOL(sock_i_ino);
1da177e4 1986EXPORT_SYMBOL(sysctl_optmem_max);
6baf1f41 1987#ifdef CONFIG_SYSCTL
1da177e4
LT		 1988EXPORT_SYMBOL(sysctl_rmem_max);
1989EXPORT_SYMBOL(sysctl_wmem_max);
1990#endif
Linux kernel - Deliverables
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