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[IPV4]: Fix build without procfs.
[linux-2.6-block.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
9958089a
AK		 982void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
983{
984 __sk_dst_set(sk, dst);
985 sk->sk_route_caps = dst->dev->features;
986 if (sk->sk_route_caps & NETIF_F_GSO)
987 sk->sk_route_caps |= NETIF_F_GSO_MASK;
988 if (sk_can_gso(sk)) {
989 if (dst->header_len)
990 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
991 else
992 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
993 }
994}
995EXPORT_SYMBOL_GPL(sk_setup_caps);
996
1da177e4
LT		 997void __init sk_init(void)
998{
999 if (num_physpages <= 4096) {
1000 sysctl_wmem_max = 32767;
1001 sysctl_rmem_max = 32767;
1002 sysctl_wmem_default = 32767;
1003 sysctl_rmem_default = 32767;
1004 } else if (num_physpages >= 131072) {
1005 sysctl_wmem_max = 131071;
1006 sysctl_rmem_max = 131071;
1007 }
1008}
1009
1010/*
1011 * Simple resource managers for sockets.
1012 */
1013
1014
4ec93edb
YH		 1015/*
1016 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1017 */
1018void sock_wfree(struct sk_buff *skb)
1019{
1020 struct sock *sk = skb->sk;
1021
1022 /* In case it might be waiting for more memory. */
1023 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1024 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1025 sk->sk_write_space(sk);
1026 sock_put(sk);
1027}
1028
4ec93edb
YH		 1029/*
1030 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1031 */
1032void sock_rfree(struct sk_buff *skb)
1033{
1034 struct sock *sk = skb->sk;
1035
1036 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1037}
1038
1039
1040int sock_i_uid(struct sock *sk)
1041{
1042 int uid;
1043
1044 read_lock(&sk->sk_callback_lock);
1045 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1046 read_unlock(&sk->sk_callback_lock);
1047 return uid;
1048}
1049
1050unsigned long sock_i_ino(struct sock *sk)
1051{
1052 unsigned long ino;
1053
1054 read_lock(&sk->sk_callback_lock);
1055 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1056 read_unlock(&sk->sk_callback_lock);
1057 return ino;
1058}
1059
1060/*
1061 * Allocate a skb from the socket's send buffer.
1062 */
86a76caf 1063struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1064 gfp_t priority)
1da177e4
LT		 1065{
1066 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1067 struct sk_buff * skb = alloc_skb(size, priority);
1068 if (skb) {
1069 skb_set_owner_w(skb, sk);
1070 return skb;
1071 }
1072 }
1073 return NULL;
1074}
1075
1076/*
1077 * Allocate a skb from the socket's receive buffer.
4ec93edb 1078 */
86a76caf 1079struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1080 gfp_t priority)
1da177e4
LT		 1081{
1082 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1083 struct sk_buff *skb = alloc_skb(size, priority);
1084 if (skb) {
1085 skb_set_owner_r(skb, sk);
1086 return skb;
1087 }
1088 }
1089 return NULL;
1090}
1091
4ec93edb 1092/*
1da177e4 1093 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1094 */
dd0fc66f 1095void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1096{
1097 if ((unsigned)size <= sysctl_optmem_max &&
1098 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1099 void *mem;
1100 /* First do the add, to avoid the race if kmalloc
4ec93edb 1101 * might sleep.
1da177e4
LT		 1102 */
1103 atomic_add(size, &sk->sk_omem_alloc);
1104 mem = kmalloc(size, priority);
1105 if (mem)
1106 return mem;
1107 atomic_sub(size, &sk->sk_omem_alloc);
1108 }
1109 return NULL;
1110}
1111
1112/*
1113 * Free an option memory block.
1114 */
1115void sock_kfree_s(struct sock *sk, void *mem, int size)
1116{
1117 kfree(mem);
1118 atomic_sub(size, &sk->sk_omem_alloc);
1119}
1120
1121/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1122 I think, these locks should be removed for datagram sockets.
1123 */
1124static long sock_wait_for_wmem(struct sock * sk, long timeo)
1125{
1126 DEFINE_WAIT(wait);
1127
1128 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1129 for (;;) {
1130 if (!timeo)
1131 break;
1132 if (signal_pending(current))
1133 break;
1134 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1135 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1136 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1137 break;
1138 if (sk->sk_shutdown & SEND_SHUTDOWN)
1139 break;
1140 if (sk->sk_err)
1141 break;
1142 timeo = schedule_timeout(timeo);
1143 }
1144 finish_wait(sk->sk_sleep, &wait);
1145 return timeo;
1146}
1147
1148
1149/*
1150 * Generic send/receive buffer handlers
1151 */
1152
1153static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1154 unsigned long header_len,
1155 unsigned long data_len,
1156 int noblock, int *errcode)
1157{
1158 struct sk_buff *skb;
7d877f3b 1159 gfp_t gfp_mask;
1da177e4
LT		 1160 long timeo;
1161 int err;
1162
1163 gfp_mask = sk->sk_allocation;
1164 if (gfp_mask & __GFP_WAIT)
1165 gfp_mask |= __GFP_REPEAT;
1166
1167 timeo = sock_sndtimeo(sk, noblock);
1168 while (1) {
1169 err = sock_error(sk);
1170 if (err != 0)
1171 goto failure;
1172
1173 err = -EPIPE;
1174 if (sk->sk_shutdown & SEND_SHUTDOWN)
1175 goto failure;
1176
1177 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1178 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1179 if (skb) {
1180 int npages;
1181 int i;
1182
1183 /* No pages, we're done... */
1184 if (!data_len)
1185 break;
1186
1187 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1188 skb->truesize += data_len;
1189 skb_shinfo(skb)->nr_frags = npages;
1190 for (i = 0; i < npages; i++) {
1191 struct page *page;
1192 skb_frag_t *frag;
1193
1194 page = alloc_pages(sk->sk_allocation, 0);
1195 if (!page) {
1196 err = -ENOBUFS;
1197 skb_shinfo(skb)->nr_frags = i;
1198 kfree_skb(skb);
1199 goto failure;
1200 }
1201
1202 frag = &skb_shinfo(skb)->frags[i];
1203 frag->page = page;
1204 frag->page_offset = 0;
1205 frag->size = (data_len >= PAGE_SIZE ?
1206 PAGE_SIZE :
1207 data_len);
1208 data_len -= PAGE_SIZE;
1209 }
1210
1211 /* Full success... */
1212 break;
1213 }
1214 err = -ENOBUFS;
1215 goto failure;
1216 }
1217 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1218 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1219 err = -EAGAIN;
1220 if (!timeo)
1221 goto failure;
1222 if (signal_pending(current))
1223 goto interrupted;
1224 timeo = sock_wait_for_wmem(sk, timeo);
1225 }
1226
1227 skb_set_owner_w(skb, sk);
1228 return skb;
1229
1230interrupted:
1231 err = sock_intr_errno(timeo);
1232failure:
1233 *errcode = err;
1234 return NULL;
1235}
1236
4ec93edb 1237struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1238 int noblock, int *errcode)
1239{
1240 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1241}
1242
1243static void __lock_sock(struct sock *sk)
1244{
1245 DEFINE_WAIT(wait);
1246
e71a4783 1247 for (;;) {
1da177e4
LT		 1248 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1249 TASK_UNINTERRUPTIBLE);
1250 spin_unlock_bh(&sk->sk_lock.slock);
1251 schedule();
1252 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1253 if (!sock_owned_by_user(sk))
1da177e4
LT		 1254 break;
1255 }
1256 finish_wait(&sk->sk_lock.wq, &wait);
1257}
1258
1259static void __release_sock(struct sock *sk)
1260{
1261 struct sk_buff *skb = sk->sk_backlog.head;
1262
1263 do {
1264 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1265 bh_unlock_sock(sk);
1266
1267 do {
1268 struct sk_buff *next = skb->next;
1269
1270 skb->next = NULL;
1271 sk->sk_backlog_rcv(sk, skb);
1272
1273 /*
1274 * We are in process context here with softirqs
1275 * disabled, use cond_resched_softirq() to preempt.
1276 * This is safe to do because we've taken the backlog
1277 * queue private:
1278 */
1279 cond_resched_softirq();
1280
1281 skb = next;
1282 } while (skb != NULL);
1283
1284 bh_lock_sock(sk);
e71a4783 1285 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1286}
1287
1288/**
1289 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1290 * @sk: sock to wait on
1291 * @timeo: for how long
1da177e4
LT		 1292 *
1293 * Now socket state including sk->sk_err is changed only under lock,
1294 * hence we may omit checks after joining wait queue.
1295 * We check receive queue before schedule() only as optimization;
1296 * it is very likely that release_sock() added new data.
1297 */
1298int sk_wait_data(struct sock *sk, long *timeo)
1299{
1300 int rc;
1301 DEFINE_WAIT(wait);
1302
1303 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1304 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1305 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1306 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1307 finish_wait(sk->sk_sleep, &wait);
1308 return rc;
1309}
1310
1311EXPORT_SYMBOL(sk_wait_data);
1312
1313/*
1314 * Set of default routines for initialising struct proto_ops when
1315 * the protocol does not support a particular function. In certain
1316 * cases where it makes no sense for a protocol to have a "do nothing"
1317 * function, some default processing is provided.
1318 */
1319
1320int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1321{
1322 return -EOPNOTSUPP;
1323}
1324
4ec93edb 1325int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1326 int len, int flags)
1327{
1328 return -EOPNOTSUPP;
1329}
1330
1331int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1332{
1333 return -EOPNOTSUPP;
1334}
1335
1336int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1337{
1338 return -EOPNOTSUPP;
1339}
1340
4ec93edb 1341int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1342 int *len, int peer)
1343{
1344 return -EOPNOTSUPP;
1345}
1346
1347unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1348{
1349 return 0;
1350}
1351
1352int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1353{
1354 return -EOPNOTSUPP;
1355}
1356
1357int sock_no_listen(struct socket *sock, int backlog)
1358{
1359 return -EOPNOTSUPP;
1360}
1361
1362int sock_no_shutdown(struct socket *sock, int how)
1363{
1364 return -EOPNOTSUPP;
1365}
1366
1367int sock_no_setsockopt(struct socket *sock, int level, int optname,
1368 char __user *optval, int optlen)
1369{
1370 return -EOPNOTSUPP;
1371}
1372
1373int sock_no_getsockopt(struct socket *sock, int level, int optname,
1374 char __user *optval, int __user *optlen)
1375{
1376 return -EOPNOTSUPP;
1377}
1378
1379int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1380 size_t len)
1381{
1382 return -EOPNOTSUPP;
1383}
1384
1385int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1386 size_t len, int flags)
1387{
1388 return -EOPNOTSUPP;
1389}
1390
1391int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1392{
1393 /* Mirror missing mmap method error code */
1394 return -ENODEV;
1395}
1396
1397ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1398{
1399 ssize_t res;
1400 struct msghdr msg = {.msg_flags = flags};
1401 struct kvec iov;
1402 char *kaddr = kmap(page);
1403 iov.iov_base = kaddr + offset;
1404 iov.iov_len = size;
1405 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1406 kunmap(page);
1407 return res;
1408}
1409
1410/*
1411 * Default Socket Callbacks
1412 */
1413
1414static void sock_def_wakeup(struct sock *sk)
1415{
1416 read_lock(&sk->sk_callback_lock);
1417 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1418 wake_up_interruptible_all(sk->sk_sleep);
1419 read_unlock(&sk->sk_callback_lock);
1420}
1421
1422static void sock_def_error_report(struct sock *sk)
1423{
1424 read_lock(&sk->sk_callback_lock);
1425 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1426 wake_up_interruptible(sk->sk_sleep);
4ec93edb 1427 sk_wake_async(sk,0,POLL_ERR);
1da177e4
LT		 1428 read_unlock(&sk->sk_callback_lock);
1429}
1430
1431static void sock_def_readable(struct sock *sk, int len)
1432{
1433 read_lock(&sk->sk_callback_lock);
1434 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1435 wake_up_interruptible(sk->sk_sleep);
1436 sk_wake_async(sk,1,POLL_IN);
1437 read_unlock(&sk->sk_callback_lock);
1438}
1439
1440static void sock_def_write_space(struct sock *sk)
1441{
1442 read_lock(&sk->sk_callback_lock);
1443
1444 /* Do not wake up a writer until he can make "significant"
1445 * progress. --DaveM
1446 */
e71a4783 1447 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1da177e4
LT		 1448 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1449 wake_up_interruptible(sk->sk_sleep);
1450
1451 /* Should agree with poll, otherwise some programs break */
1452 if (sock_writeable(sk))
1453 sk_wake_async(sk, 2, POLL_OUT);
1454 }
1455
1456 read_unlock(&sk->sk_callback_lock);
1457}
1458
1459static void sock_def_destruct(struct sock *sk)
1460{
a51482bd 1461 kfree(sk->sk_protinfo);
1da177e4
LT		 1462}
1463
1464void sk_send_sigurg(struct sock *sk)
1465{
1466 if (sk->sk_socket && sk->sk_socket->file)
1467 if (send_sigurg(&sk->sk_socket->file->f_owner))
1468 sk_wake_async(sk, 3, POLL_PRI);
1469}
1470
1471void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1472 unsigned long expires)
1473{
1474 if (!mod_timer(timer, expires))
1475 sock_hold(sk);
1476}
1477
1478EXPORT_SYMBOL(sk_reset_timer);
1479
1480void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1481{
1482 if (timer_pending(timer) && del_timer(timer))
1483 __sock_put(sk);
1484}
1485
1486EXPORT_SYMBOL(sk_stop_timer);
1487
1488void sock_init_data(struct socket *sock, struct sock *sk)
1489{
1490 skb_queue_head_init(&sk->sk_receive_queue);
1491 skb_queue_head_init(&sk->sk_write_queue);
1492 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1493#ifdef CONFIG_NET_DMA
1494 skb_queue_head_init(&sk->sk_async_wait_queue);
1495#endif
1da177e4
LT		 1496
1497 sk->sk_send_head = NULL;
1498
1499 init_timer(&sk->sk_timer);
4ec93edb 1500
1da177e4
LT		 1501 sk->sk_allocation = GFP_KERNEL;
1502 sk->sk_rcvbuf = sysctl_rmem_default;
1503 sk->sk_sndbuf = sysctl_wmem_default;
1504 sk->sk_state = TCP_CLOSE;
1505 sk->sk_socket = sock;
1506
1507 sock_set_flag(sk, SOCK_ZAPPED);
1508
e71a4783 1509 if (sock) {
1da177e4
LT		 1510 sk->sk_type = sock->type;
1511 sk->sk_sleep = &sock->wait;
1512 sock->sk = sk;
1513 } else
1514 sk->sk_sleep = NULL;
1515
1516 rwlock_init(&sk->sk_dst_lock);
1517 rwlock_init(&sk->sk_callback_lock);
da21f24d
IM		 1518 lockdep_set_class(&sk->sk_callback_lock,
1519 af_callback_keys + sk->sk_family);
1da177e4
LT		 1520
1521 sk->sk_state_change = sock_def_wakeup;
1522 sk->sk_data_ready = sock_def_readable;
1523 sk->sk_write_space = sock_def_write_space;
1524 sk->sk_error_report = sock_def_error_report;
1525 sk->sk_destruct = sock_def_destruct;
1526
1527 sk->sk_sndmsg_page = NULL;
1528 sk->sk_sndmsg_off = 0;
1529
1530 sk->sk_peercred.pid = 0;
1531 sk->sk_peercred.uid = -1;
1532 sk->sk_peercred.gid = -1;
1533 sk->sk_write_pending = 0;
1534 sk->sk_rcvlowat = 1;
1535 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1536 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1537
b7aa0bf7 1538 sk->sk_stamp = ktime_set(-1L, -1L);
1da177e4
LT		 1539
1540 atomic_set(&sk->sk_refcnt, 1);
1541}
1542
fcc70d5f 1543void fastcall lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1544{
1545 might_sleep();
a5b5bb9a 1546 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1547 if (sk->sk_lock.owner)
1548 __lock_sock(sk);
1549 sk->sk_lock.owner = (void *)1;
a5b5bb9a
IM		 1550 spin_unlock(&sk->sk_lock.slock);
1551 /*
1552 * The sk_lock has mutex_lock() semantics here:
1553 */
fcc70d5f 1554 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1555 local_bh_enable();
1da177e4
LT		 1556}
1557
fcc70d5f 1558EXPORT_SYMBOL(lock_sock_nested);
1da177e4
LT		 1559
1560void fastcall release_sock(struct sock *sk)
1561{
a5b5bb9a
IM		 1562 /*
1563 * The sk_lock has mutex_unlock() semantics:
1564 */
1565 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1566
1567 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1568 if (sk->sk_backlog.tail)
1569 __release_sock(sk);
1570 sk->sk_lock.owner = NULL;
a5b5bb9a
IM		 1571 if (waitqueue_active(&sk->sk_lock.wq))
1572 wake_up(&sk->sk_lock.wq);
1573 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1574}
1575EXPORT_SYMBOL(release_sock);
1576
1577int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1578{
b7aa0bf7 1579 struct timeval tv;
1da177e4
LT		 1580 if (!sock_flag(sk, SOCK_TIMESTAMP))
1581 sock_enable_timestamp(sk);
b7aa0bf7
ED		 1582 tv = ktime_to_timeval(sk->sk_stamp);
1583 if (tv.tv_sec == -1)
1da177e4 1584 return -ENOENT;
b7aa0bf7
ED		 1585 if (tv.tv_sec == 0) {
1586 sk->sk_stamp = ktime_get_real();
1587 tv = ktime_to_timeval(sk->sk_stamp);
1588 }
1589 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1590}
1da177e4
LT		 1591EXPORT_SYMBOL(sock_get_timestamp);
1592
ae40eb1e
ED		 1593int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1594{
1595 struct timespec ts;
1596 if (!sock_flag(sk, SOCK_TIMESTAMP))
1597 sock_enable_timestamp(sk);
1598 ts = ktime_to_timespec(sk->sk_stamp);
1599 if (ts.tv_sec == -1)
1600 return -ENOENT;
1601 if (ts.tv_sec == 0) {
1602 sk->sk_stamp = ktime_get_real();
1603 ts = ktime_to_timespec(sk->sk_stamp);
1604 }
1605 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1606}
1607EXPORT_SYMBOL(sock_get_timestampns);
1608
1da177e4 1609void sock_enable_timestamp(struct sock *sk)
4ec93edb
YH		 1610{
1611 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 1612 sock_set_flag(sk, SOCK_TIMESTAMP);
1613 net_enable_timestamp();
1614 }
1615}
4ec93edb 1616EXPORT_SYMBOL(sock_enable_timestamp);
1da177e4
LT		 1617
1618/*
1619 * Get a socket option on an socket.
1620 *
1621 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1622 * asynchronous errors should be reported by getsockopt. We assume
1623 * this means if you specify SO_ERROR (otherwise whats the point of it).
1624 */
1625int sock_common_getsockopt(struct socket *sock, int level, int optname,
1626 char __user *optval, int __user *optlen)
1627{
1628 struct sock *sk = sock->sk;
1629
1630 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1631}
1632
1633EXPORT_SYMBOL(sock_common_getsockopt);
1634
3fdadf7d 1635#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1636int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1637 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1638{
1639 struct sock *sk = sock->sk;
1640
1e51f951 1641 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 1642 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1643 optval, optlen);
3fdadf7d
DM		 1644 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1645}
1646EXPORT_SYMBOL(compat_sock_common_getsockopt);
1647#endif
1648
1da177e4
LT		 1649int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1650 struct msghdr *msg, size_t size, int flags)
1651{
1652 struct sock *sk = sock->sk;
1653 int addr_len = 0;
1654 int err;
1655
1656 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1657 flags & ~MSG_DONTWAIT, &addr_len);
1658 if (err >= 0)
1659 msg->msg_namelen = addr_len;
1660 return err;
1661}
1662
1663EXPORT_SYMBOL(sock_common_recvmsg);
1664
1665/*
1666 * Set socket options on an inet socket.
1667 */
1668int sock_common_setsockopt(struct socket *sock, int level, int optname,
1669 char __user *optval, int optlen)
1670{
1671 struct sock *sk = sock->sk;
1672
1673 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1674}
1675
1676EXPORT_SYMBOL(sock_common_setsockopt);
1677
3fdadf7d 1678#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1679int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1680 char __user *optval, int optlen)
3fdadf7d
DM		 1681{
1682 struct sock *sk = sock->sk;
1683
543d9cfe
ACM		 1684 if (sk->sk_prot->compat_setsockopt != NULL)
1685 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1686 optval, optlen);
3fdadf7d
DM		 1687 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1688}
1689EXPORT_SYMBOL(compat_sock_common_setsockopt);
1690#endif
1691
1da177e4
LT		 1692void sk_common_release(struct sock *sk)
1693{
1694 if (sk->sk_prot->destroy)
1695 sk->sk_prot->destroy(sk);
1696
1697 /*
1698 * Observation: when sock_common_release is called, processes have
1699 * no access to socket. But net still has.
1700 * Step one, detach it from networking:
1701 *
1702 * A. Remove from hash tables.
1703 */
1704
1705 sk->sk_prot->unhash(sk);
1706
1707 /*
1708 * In this point socket cannot receive new packets, but it is possible
1709 * that some packets are in flight because some CPU runs receiver and
1710 * did hash table lookup before we unhashed socket. They will achieve
1711 * receive queue and will be purged by socket destructor.
1712 *
1713 * Also we still have packets pending on receive queue and probably,
1714 * our own packets waiting in device queues. sock_destroy will drain
1715 * receive queue, but transmitted packets will delay socket destruction
1716 * until the last reference will be released.
1717 */
1718
1719 sock_orphan(sk);
1720
1721 xfrm_sk_free_policy(sk);
1722
e6848976 1723 sk_refcnt_debug_release(sk);
1da177e4
LT		 1724 sock_put(sk);
1725}
1726
1727EXPORT_SYMBOL(sk_common_release);
1728
1729static DEFINE_RWLOCK(proto_list_lock);
1730static LIST_HEAD(proto_list);
1731
1732int proto_register(struct proto *prot, int alloc_slab)
1733{
8feaf0c0
ACM		 1734 char *request_sock_slab_name = NULL;
1735 char *timewait_sock_slab_name;
1da177e4
LT		 1736 int rc = -ENOBUFS;
1737
1da177e4
LT		 1738 if (alloc_slab) {
1739 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
1740 SLAB_HWCACHE_ALIGN, NULL, NULL);
1741
1742 if (prot->slab == NULL) {
1743 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
1744 prot->name);
2a278051 1745 goto out;
1da177e4 1746 }
2e6599cb
ACM		 1747
1748 if (prot->rsk_prot != NULL) {
1749 static const char mask[] = "request_sock_%s";
1750
1751 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1752 if (request_sock_slab_name == NULL)
1753 goto out_free_sock_slab;
1754
1755 sprintf(request_sock_slab_name, mask, prot->name);
1756 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
1757 prot->rsk_prot->obj_size, 0,
1758 SLAB_HWCACHE_ALIGN, NULL, NULL);
1759
1760 if (prot->rsk_prot->slab == NULL) {
1761 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
1762 prot->name);
1763 goto out_free_request_sock_slab_name;
1764 }
1765 }
8feaf0c0 1766
6d6ee43e 1767 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 1768 static const char mask[] = "tw_sock_%s";
1769
1770 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1771
1772 if (timewait_sock_slab_name == NULL)
1773 goto out_free_request_sock_slab;
1774
1775 sprintf(timewait_sock_slab_name, mask, prot->name);
6d6ee43e
ACM		 1776 prot->twsk_prot->twsk_slab =
1777 kmem_cache_create(timewait_sock_slab_name,
1778 prot->twsk_prot->twsk_obj_size,
1779 0, SLAB_HWCACHE_ALIGN,
1780 NULL, NULL);
1781 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 1782 goto out_free_timewait_sock_slab_name;
1783 }
1da177e4
LT		 1784 }
1785
2a278051 1786 write_lock(&proto_list_lock);
1da177e4 1787 list_add(&prot->node, &proto_list);
1da177e4 1788 write_unlock(&proto_list_lock);
2a278051
ACM		 1789 rc = 0;
1790out:
1da177e4 1791 return rc;
8feaf0c0
ACM		 1792out_free_timewait_sock_slab_name:
1793 kfree(timewait_sock_slab_name);
1794out_free_request_sock_slab:
1795 if (prot->rsk_prot && prot->rsk_prot->slab) {
1796 kmem_cache_destroy(prot->rsk_prot->slab);
1797 prot->rsk_prot->slab = NULL;
1798 }
2e6599cb
ACM		 1799out_free_request_sock_slab_name:
1800 kfree(request_sock_slab_name);
1801out_free_sock_slab:
1802 kmem_cache_destroy(prot->slab);
1803 prot->slab = NULL;
1804 goto out;
1da177e4
LT		 1805}
1806
1807EXPORT_SYMBOL(proto_register);
1808
1809void proto_unregister(struct proto *prot)
1810{
1811 write_lock(&proto_list_lock);
0a3f4358
PM		 1812 list_del(&prot->node);
1813 write_unlock(&proto_list_lock);
1da177e4
LT		 1814
1815 if (prot->slab != NULL) {
1816 kmem_cache_destroy(prot->slab);
1817 prot->slab = NULL;
1818 }
1819
2e6599cb
ACM		 1820 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
1821 const char *name = kmem_cache_name(prot->rsk_prot->slab);
1822
1823 kmem_cache_destroy(prot->rsk_prot->slab);
1824 kfree(name);
1825 prot->rsk_prot->slab = NULL;
1826 }
1827
6d6ee43e
ACM		 1828 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
1829 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
8feaf0c0 1830
6d6ee43e 1831 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
8feaf0c0 1832 kfree(name);
6d6ee43e 1833 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 1834 }
1da177e4
LT		 1835}
1836
1837EXPORT_SYMBOL(proto_unregister);
1838
1839#ifdef CONFIG_PROC_FS
1840static inline struct proto *__proto_head(void)
1841{
1842 return list_entry(proto_list.next, struct proto, node);
1843}
1844
1845static inline struct proto *proto_head(void)
1846{
1847 return list_empty(&proto_list) ? NULL : __proto_head();
1848}
1849
1850static inline struct proto *proto_next(struct proto *proto)
1851{
1852 return proto->node.next == &proto_list ? NULL :
1853 list_entry(proto->node.next, struct proto, node);
1854}
1855
1856static inline struct proto *proto_get_idx(loff_t pos)
1857{
1858 struct proto *proto;
1859 loff_t i = 0;
1860
1861 list_for_each_entry(proto, &proto_list, node)
1862 if (i++ == pos)
1863 goto out;
1864
1865 proto = NULL;
1866out:
1867 return proto;
1868}
1869
1870static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
1871{
1872 read_lock(&proto_list_lock);
1873 return *pos ? proto_get_idx(*pos - 1) : SEQ_START_TOKEN;
1874}
1875
1876static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1877{
1878 ++*pos;
1879 return v == SEQ_START_TOKEN ? proto_head() : proto_next(v);
1880}
1881
1882static void proto_seq_stop(struct seq_file *seq, void *v)
1883{
1884 read_unlock(&proto_list_lock);
1885}
1886
1887static char proto_method_implemented(const void *method)
1888{
1889 return method == NULL ? 'n' : 'y';
1890}
1891
1892static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
1893{
1894 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
1895 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
1896 proto->name,
1897 proto->obj_size,
1898 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
1899 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
1900 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
1901 proto->max_header,
1902 proto->slab == NULL ? "no" : "yes",
1903 module_name(proto->owner),
1904 proto_method_implemented(proto->close),
1905 proto_method_implemented(proto->connect),
1906 proto_method_implemented(proto->disconnect),
1907 proto_method_implemented(proto->accept),
1908 proto_method_implemented(proto->ioctl),
1909 proto_method_implemented(proto->init),
1910 proto_method_implemented(proto->destroy),
1911 proto_method_implemented(proto->shutdown),
1912 proto_method_implemented(proto->setsockopt),
1913 proto_method_implemented(proto->getsockopt),
1914 proto_method_implemented(proto->sendmsg),
1915 proto_method_implemented(proto->recvmsg),
1916 proto_method_implemented(proto->sendpage),
1917 proto_method_implemented(proto->bind),
1918 proto_method_implemented(proto->backlog_rcv),
1919 proto_method_implemented(proto->hash),
1920 proto_method_implemented(proto->unhash),
1921 proto_method_implemented(proto->get_port),
1922 proto_method_implemented(proto->enter_memory_pressure));
1923}
1924
1925static int proto_seq_show(struct seq_file *seq, void *v)
1926{
1927 if (v == SEQ_START_TOKEN)
1928 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
1929 "protocol",
1930 "size",
1931 "sockets",
1932 "memory",
1933 "press",
1934 "maxhdr",
1935 "slab",
1936 "module",
1937 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
1938 else
1939 proto_seq_printf(seq, v);
1940 return 0;
1941}
1942
f690808e 1943static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 1944 .start = proto_seq_start,
1945 .next = proto_seq_next,
1946 .stop = proto_seq_stop,
1947 .show = proto_seq_show,
1948};
1949
1950static int proto_seq_open(struct inode *inode, struct file *file)
1951{
1952 return seq_open(file, &proto_seq_ops);
1953}
1954
9a32144e 1955static const struct file_operations proto_seq_fops = {
1da177e4
LT		 1956 .owner = THIS_MODULE,
1957 .open = proto_seq_open,
1958 .read = seq_read,
1959 .llseek = seq_lseek,
1960 .release = seq_release,
1961};
1962
1963static int __init proto_init(void)
1964{
1965 /* register /proc/net/protocols */
1966 return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
1967}
1968
1969subsys_initcall(proto_init);
1970
1971#endif /* PROC_FS */
1972
1973EXPORT_SYMBOL(sk_alloc);
1974EXPORT_SYMBOL(sk_free);
1975EXPORT_SYMBOL(sk_send_sigurg);
1976EXPORT_SYMBOL(sock_alloc_send_skb);
1977EXPORT_SYMBOL(sock_init_data);
1978EXPORT_SYMBOL(sock_kfree_s);
1979EXPORT_SYMBOL(sock_kmalloc);
1980EXPORT_SYMBOL(sock_no_accept);
1981EXPORT_SYMBOL(sock_no_bind);
1982EXPORT_SYMBOL(sock_no_connect);
1983EXPORT_SYMBOL(sock_no_getname);
1984EXPORT_SYMBOL(sock_no_getsockopt);
1985EXPORT_SYMBOL(sock_no_ioctl);
1986EXPORT_SYMBOL(sock_no_listen);
1987EXPORT_SYMBOL(sock_no_mmap);
1988EXPORT_SYMBOL(sock_no_poll);
1989EXPORT_SYMBOL(sock_no_recvmsg);
1990EXPORT_SYMBOL(sock_no_sendmsg);
1991EXPORT_SYMBOL(sock_no_sendpage);
1992EXPORT_SYMBOL(sock_no_setsockopt);
1993EXPORT_SYMBOL(sock_no_shutdown);
1994EXPORT_SYMBOL(sock_no_socketpair);
1995EXPORT_SYMBOL(sock_rfree);
1996EXPORT_SYMBOL(sock_setsockopt);
1997EXPORT_SYMBOL(sock_wfree);
1998EXPORT_SYMBOL(sock_wmalloc);
1999EXPORT_SYMBOL(sock_i_uid);
2000EXPORT_SYMBOL(sock_i_ino);
1da177e4 2001EXPORT_SYMBOL(sysctl_optmem_max);
6baf1f41 2002#ifdef CONFIG_SYSCTL
1da177e4
LT		 2003EXPORT_SYMBOL(sysctl_rmem_max);
2004EXPORT_SYMBOL(sysctl_wmem_max);
2005#endif
Linux 6.x block layer and io_uring tree(s)