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net core: fix kernel-doc for new function parameters
[net-next-2.6.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>
457c4cbc 122#include <net/net_namespace.h>
2e6599cb 123#include <net/request_sock.h>
1da177e4
LT		 124#include <net/sock.h>
125#include <net/xfrm.h>
126#include <linux/ipsec.h>
127
128#include <linux/filter.h>
129
130#ifdef CONFIG_INET
131#include <net/tcp.h>
132#endif
133
da21f24d
IM		 134/*
135 * Each address family might have different locking rules, so we have
136 * one slock key per address family:
137 */
a5b5bb9a
IM		 138static struct lock_class_key af_family_keys[AF_MAX];
139static struct lock_class_key af_family_slock_keys[AF_MAX];
140
141#ifdef CONFIG_DEBUG_LOCK_ALLOC
142/*
143 * Make lock validator output more readable. (we pre-construct these
144 * strings build-time, so that runtime initialization of socket
145 * locks is fast):
146 */
147static const char *af_family_key_strings[AF_MAX+1] = {
148 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
149 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
150 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
151 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
152 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
153 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
154 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
155 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
156 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
157 "sk_lock-27" , "sk_lock-28" , "sk_lock-29" ,
17926a79
DH		 158 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
159 "sk_lock-AF_RXRPC" , "sk_lock-AF_MAX"
a5b5bb9a
IM		 160};
161static const char *af_family_slock_key_strings[AF_MAX+1] = {
162 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
163 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
164 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
165 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
166 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
167 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
168 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
169 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" ,
170 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
171 "slock-27" , "slock-28" , "slock-29" ,
17926a79
DH		 172 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
173 "slock-AF_RXRPC" , "slock-AF_MAX"
a5b5bb9a 174};
443aef0e
PZ		 175static const char *af_family_clock_key_strings[AF_MAX+1] = {
176 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
177 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
178 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
179 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
180 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
181 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
182 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
183 "clock-21" , "clock-AF_SNA" , "clock-AF_IRDA" ,
184 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
185 "clock-27" , "clock-28" , "clock-29" ,
e51f802b
DH		 186 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
187 "clock-AF_RXRPC" , "clock-AF_MAX"
443aef0e 188};
a5b5bb9a 189#endif
da21f24d
IM		 190
191/*
192 * sk_callback_lock locking rules are per-address-family,
193 * so split the lock classes by using a per-AF key:
194 */
195static struct lock_class_key af_callback_keys[AF_MAX];
196
1da177e4
LT		 197/* Take into consideration the size of the struct sk_buff overhead in the
198 * determination of these values, since that is non-constant across
199 * platforms. This makes socket queueing behavior and performance
200 * not depend upon such differences.
201 */
202#define _SK_MEM_PACKETS 256
203#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
204#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
205#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
206
207/* Run time adjustable parameters. */
ab32ea5d
BH		 208__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
209__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
210__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
211__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4
LT		 212
213/* Maximal space eaten by iovec or ancilliary data plus some space */
ab32ea5d 214int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
1da177e4
LT		 215
216static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
217{
218 struct timeval tv;
219
220 if (optlen < sizeof(tv))
221 return -EINVAL;
222 if (copy_from_user(&tv, optval, sizeof(tv)))
223 return -EFAULT;
ba78073e
VA		 224 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
225 return -EDOM;
1da177e4 226
ba78073e 227 if (tv.tv_sec < 0) {
6f11df83
AM		 228 static int warned __read_mostly;
229
ba78073e
VA		 230 *timeo_p = 0;
231 if (warned < 10 && net_ratelimit())
232 warned++;
233 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
234 "tries to set negative timeout\n",
40b77c94 235 current->comm, current->pid);
ba78073e
VA		 236 return 0;
237 }
1da177e4
LT		 238 *timeo_p = MAX_SCHEDULE_TIMEOUT;
239 if (tv.tv_sec == 0 && tv.tv_usec == 0)
240 return 0;
241 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
242 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
243 return 0;
244}
245
246static void sock_warn_obsolete_bsdism(const char *name)
247{
248 static int warned;
249 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 250 if (strcmp(warncomm, current->comm) && warned < 5) {
251 strcpy(warncomm, current->comm);
1da177e4
LT		 252 printk(KERN_WARNING "process `%s' is using obsolete "
253 "%s SO_BSDCOMPAT\n", warncomm, name);
254 warned++;
255 }
256}
257
258static void sock_disable_timestamp(struct sock *sk)
4ec93edb
YH		 259{
260 if (sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 261 sock_reset_flag(sk, SOCK_TIMESTAMP);
262 net_disable_timestamp();
263 }
264}
265
266
f0088a50
DV		 267int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
268{
269 int err = 0;
270 int skb_len;
271
272 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
273 number of warnings when compiling with -W --ANK
274 */
275 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
276 (unsigned)sk->sk_rcvbuf) {
277 err = -ENOMEM;
278 goto out;
279 }
280
fda9ef5d 281 err = sk_filter(sk, skb);
f0088a50
DV		 282 if (err)
283 goto out;
284
285 skb->dev = NULL;
286 skb_set_owner_r(skb, sk);
287
288 /* Cache the SKB length before we tack it onto the receive
289 * queue. Once it is added it no longer belongs to us and
290 * may be freed by other threads of control pulling packets
291 * from the queue.
292 */
293 skb_len = skb->len;
294
295 skb_queue_tail(&sk->sk_receive_queue, skb);
296
297 if (!sock_flag(sk, SOCK_DEAD))
298 sk->sk_data_ready(sk, skb_len);
299out:
300 return err;
301}
302EXPORT_SYMBOL(sock_queue_rcv_skb);
303
58a5a7b9 304int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 305{
306 int rc = NET_RX_SUCCESS;
307
fda9ef5d 308 if (sk_filter(sk, skb))
f0088a50
DV		 309 goto discard_and_relse;
310
311 skb->dev = NULL;
312
58a5a7b9
ACM		 313 if (nested)
314 bh_lock_sock_nested(sk);
315 else
316 bh_lock_sock(sk);
a5b5bb9a
IM		 317 if (!sock_owned_by_user(sk)) {
318 /*
319 * trylock + unlock semantics:
320 */
321 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
322
f0088a50 323 rc = sk->sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 324
325 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
326 } else
f0088a50
DV		 327 sk_add_backlog(sk, skb);
328 bh_unlock_sock(sk);
329out:
330 sock_put(sk);
331 return rc;
332discard_and_relse:
333 kfree_skb(skb);
334 goto out;
335}
336EXPORT_SYMBOL(sk_receive_skb);
337
338struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
339{
340 struct dst_entry *dst = sk->sk_dst_cache;
341
342 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
343 sk->sk_dst_cache = NULL;
344 dst_release(dst);
345 return NULL;
346 }
347
348 return dst;
349}
350EXPORT_SYMBOL(__sk_dst_check);
351
352struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
353{
354 struct dst_entry *dst = sk_dst_get(sk);
355
356 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
357 sk_dst_reset(sk);
358 dst_release(dst);
359 return NULL;
360 }
361
362 return dst;
363}
364EXPORT_SYMBOL(sk_dst_check);
365
4878809f
DM		 366static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
367{
368 int ret = -ENOPROTOOPT;
369#ifdef CONFIG_NETDEVICES
881d966b 370 struct net *net = sk->sk_net;
4878809f
DM		 371 char devname[IFNAMSIZ];
372 int index;
373
374 /* Sorry... */
375 ret = -EPERM;
376 if (!capable(CAP_NET_RAW))
377 goto out;
378
379 ret = -EINVAL;
380 if (optlen < 0)
381 goto out;
382
383 /* Bind this socket to a particular device like "eth0",
384 * as specified in the passed interface name. If the
385 * name is "" or the option length is zero the socket
386 * is not bound.
387 */
388 if (optlen > IFNAMSIZ - 1)
389 optlen = IFNAMSIZ - 1;
390 memset(devname, 0, sizeof(devname));
391
392 ret = -EFAULT;
393 if (copy_from_user(devname, optval, optlen))
394 goto out;
395
396 if (devname[0] == '\0') {
397 index = 0;
398 } else {
881d966b 399 struct net_device *dev = dev_get_by_name(net, devname);
4878809f
DM		 400
401 ret = -ENODEV;
402 if (!dev)
403 goto out;
404
405 index = dev->ifindex;
406 dev_put(dev);
407 }
408
409 lock_sock(sk);
410 sk->sk_bound_dev_if = index;
411 sk_dst_reset(sk);
412 release_sock(sk);
413
414 ret = 0;
415
416out:
417#endif
418
419 return ret;
420}
421
1da177e4
LT		 422/*
423 * This is meant for all protocols to use and covers goings on
424 * at the socket level. Everything here is generic.
425 */
426
427int sock_setsockopt(struct socket *sock, int level, int optname,
428 char __user *optval, int optlen)
429{
430 struct sock *sk=sock->sk;
431 struct sk_filter *filter;
432 int val;
433 int valbool;
434 struct linger ling;
435 int ret = 0;
4ec93edb 436
1da177e4
LT		 437 /*
438 * Options without arguments
439 */
440
441#ifdef SO_DONTLINGER /* Compatibility item... */
a77be819
KM		 442 if (optname == SO_DONTLINGER) {
443 lock_sock(sk);
444 sock_reset_flag(sk, SOCK_LINGER);
445 release_sock(sk);
446 return 0;
1da177e4 447 }
a77be819 448#endif
4ec93edb 449
4878809f
DM		 450 if (optname == SO_BINDTODEVICE)
451 return sock_bindtodevice(sk, optval, optlen);
452
e71a4783
SH		 453 if (optlen < sizeof(int))
454 return -EINVAL;
4ec93edb 455
1da177e4
LT		 456 if (get_user(val, (int __user *)optval))
457 return -EFAULT;
4ec93edb
YH		 458
459 valbool = val?1:0;
1da177e4
LT		 460
461 lock_sock(sk);
462
e71a4783
SH		 463 switch(optname) {
464 case SO_DEBUG:
465 if (val && !capable(CAP_NET_ADMIN)) {
466 ret = -EACCES;
467 }
468 else if (valbool)
469 sock_set_flag(sk, SOCK_DBG);
470 else
471 sock_reset_flag(sk, SOCK_DBG);
472 break;
473 case SO_REUSEADDR:
474 sk->sk_reuse = valbool;
475 break;
476 case SO_TYPE:
477 case SO_ERROR:
478 ret = -ENOPROTOOPT;
479 break;
480 case SO_DONTROUTE:
481 if (valbool)
482 sock_set_flag(sk, SOCK_LOCALROUTE);
483 else
484 sock_reset_flag(sk, SOCK_LOCALROUTE);
485 break;
486 case SO_BROADCAST:
487 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
488 break;
489 case SO_SNDBUF:
490 /* Don't error on this BSD doesn't and if you think
491 about it this is right. Otherwise apps have to
492 play 'guess the biggest size' games. RCVBUF/SNDBUF
493 are treated in BSD as hints */
494
495 if (val > sysctl_wmem_max)
496 val = sysctl_wmem_max;
b0573dea 497set_sndbuf:
e71a4783
SH		 498 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
499 if ((val * 2) < SOCK_MIN_SNDBUF)
500 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
501 else
502 sk->sk_sndbuf = val * 2;
1da177e4 503
e71a4783
SH		 504 /*
505 * Wake up sending tasks if we
506 * upped the value.
507 */
508 sk->sk_write_space(sk);
509 break;
1da177e4 510
e71a4783
SH		 511 case SO_SNDBUFFORCE:
512 if (!capable(CAP_NET_ADMIN)) {
513 ret = -EPERM;
514 break;
515 }
516 goto set_sndbuf;
b0573dea 517
e71a4783
SH		 518 case SO_RCVBUF:
519 /* Don't error on this BSD doesn't and if you think
520 about it this is right. Otherwise apps have to
521 play 'guess the biggest size' games. RCVBUF/SNDBUF
522 are treated in BSD as hints */
4ec93edb 523
e71a4783
SH		 524 if (val > sysctl_rmem_max)
525 val = sysctl_rmem_max;
b0573dea 526set_rcvbuf:
e71a4783
SH		 527 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
528 /*
529 * We double it on the way in to account for
530 * "struct sk_buff" etc. overhead. Applications
531 * assume that the SO_RCVBUF setting they make will
532 * allow that much actual data to be received on that
533 * socket.
534 *
535 * Applications are unaware that "struct sk_buff" and
536 * other overheads allocate from the receive buffer
537 * during socket buffer allocation.
538 *
539 * And after considering the possible alternatives,
540 * returning the value we actually used in getsockopt
541 * is the most desirable behavior.
542 */
543 if ((val * 2) < SOCK_MIN_RCVBUF)
544 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
545 else
546 sk->sk_rcvbuf = val * 2;
547 break;
548
549 case SO_RCVBUFFORCE:
550 if (!capable(CAP_NET_ADMIN)) {
551 ret = -EPERM;
1da177e4 552 break;
e71a4783
SH		 553 }
554 goto set_rcvbuf;
1da177e4 555
e71a4783 556 case SO_KEEPALIVE:
1da177e4 557#ifdef CONFIG_INET
e71a4783
SH		 558 if (sk->sk_protocol == IPPROTO_TCP)
559 tcp_set_keepalive(sk, valbool);
1da177e4 560#endif
e71a4783
SH		 561 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
562 break;
563
564 case SO_OOBINLINE:
565 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
566 break;
567
568 case SO_NO_CHECK:
569 sk->sk_no_check = valbool;
570 break;
571
572 case SO_PRIORITY:
573 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
574 sk->sk_priority = val;
575 else
576 ret = -EPERM;
577 break;
578
579 case SO_LINGER:
580 if (optlen < sizeof(ling)) {
581 ret = -EINVAL; /* 1003.1g */
1da177e4 582 break;
e71a4783
SH		 583 }
584 if (copy_from_user(&ling,optval,sizeof(ling))) {
585 ret = -EFAULT;
1da177e4 586 break;
e71a4783
SH		 587 }
588 if (!ling.l_onoff)
589 sock_reset_flag(sk, SOCK_LINGER);
590 else {
1da177e4 591#if (BITS_PER_LONG == 32)
e71a4783
SH		 592 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
593 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 594 else
e71a4783
SH		 595#endif
596 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
597 sock_set_flag(sk, SOCK_LINGER);
598 }
599 break;
600
601 case SO_BSDCOMPAT:
602 sock_warn_obsolete_bsdism("setsockopt");
603 break;
604
605 case SO_PASSCRED:
606 if (valbool)
607 set_bit(SOCK_PASSCRED, &sock->flags);
608 else
609 clear_bit(SOCK_PASSCRED, &sock->flags);
610 break;
611
612 case SO_TIMESTAMP:
92f37fd2 613 case SO_TIMESTAMPNS:
e71a4783 614 if (valbool) {
92f37fd2
ED		 615 if (optname == SO_TIMESTAMP)
616 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
617 else
618 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 619 sock_set_flag(sk, SOCK_RCVTSTAMP);
620 sock_enable_timestamp(sk);
92f37fd2 621 } else {
e71a4783 622 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 623 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
624 }
e71a4783
SH		 625 break;
626
627 case SO_RCVLOWAT:
628 if (val < 0)
629 val = INT_MAX;
630 sk->sk_rcvlowat = val ? : 1;
631 break;
632
633 case SO_RCVTIMEO:
634 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
635 break;
636
637 case SO_SNDTIMEO:
638 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
639 break;
1da177e4 640
e71a4783
SH		 641 case SO_ATTACH_FILTER:
642 ret = -EINVAL;
643 if (optlen == sizeof(struct sock_fprog)) {
644 struct sock_fprog fprog;
1da177e4 645
e71a4783
SH		 646 ret = -EFAULT;
647 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 648 break;
e71a4783
SH		 649
650 ret = sk_attach_filter(&fprog, sk);
651 }
652 break;
653
654 case SO_DETACH_FILTER:
655 rcu_read_lock_bh();
656 filter = rcu_dereference(sk->sk_filter);
657 if (filter) {
658 rcu_assign_pointer(sk->sk_filter, NULL);
659 sk_filter_release(sk, filter);
fda9ef5d 660 rcu_read_unlock_bh();
1da177e4 661 break;
e71a4783
SH		 662 }
663 rcu_read_unlock_bh();
664 ret = -ENONET;
665 break;
1da177e4 666
e71a4783
SH		 667 case SO_PASSSEC:
668 if (valbool)
669 set_bit(SOCK_PASSSEC, &sock->flags);
670 else
671 clear_bit(SOCK_PASSSEC, &sock->flags);
672 break;
877ce7c1 673
1da177e4
LT		 674 /* We implement the SO_SNDLOWAT etc to
675 not be settable (1003.1g 5.3) */
e71a4783
SH		 676 default:
677 ret = -ENOPROTOOPT;
678 break;
4ec93edb 679 }
1da177e4
LT		 680 release_sock(sk);
681 return ret;
682}
683
684
685int sock_getsockopt(struct socket *sock, int level, int optname,
686 char __user *optval, int __user *optlen)
687{
688 struct sock *sk = sock->sk;
4ec93edb 689
e71a4783 690 union {
4ec93edb
YH		 691 int val;
692 struct linger ling;
1da177e4
LT		 693 struct timeval tm;
694 } v;
4ec93edb 695
1da177e4
LT		 696 unsigned int lv = sizeof(int);
697 int len;
4ec93edb 698
e71a4783 699 if (get_user(len, optlen))
4ec93edb 700 return -EFAULT;
e71a4783 701 if (len < 0)
1da177e4 702 return -EINVAL;
4ec93edb 703
e71a4783
SH		 704 switch(optname) {
705 case SO_DEBUG:
706 v.val = sock_flag(sk, SOCK_DBG);
707 break;
708
709 case SO_DONTROUTE:
710 v.val = sock_flag(sk, SOCK_LOCALROUTE);
711 break;
712
713 case SO_BROADCAST:
714 v.val = !!sock_flag(sk, SOCK_BROADCAST);
715 break;
716
717 case SO_SNDBUF:
718 v.val = sk->sk_sndbuf;
719 break;
720
721 case SO_RCVBUF:
722 v.val = sk->sk_rcvbuf;
723 break;
724
725 case SO_REUSEADDR:
726 v.val = sk->sk_reuse;
727 break;
728
729 case SO_KEEPALIVE:
730 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
731 break;
732
733 case SO_TYPE:
734 v.val = sk->sk_type;
735 break;
736
737 case SO_ERROR:
738 v.val = -sock_error(sk);
739 if (v.val==0)
740 v.val = xchg(&sk->sk_err_soft, 0);
741 break;
742
743 case SO_OOBINLINE:
744 v.val = !!sock_flag(sk, SOCK_URGINLINE);
745 break;
746
747 case SO_NO_CHECK:
748 v.val = sk->sk_no_check;
749 break;
750
751 case SO_PRIORITY:
752 v.val = sk->sk_priority;
753 break;
754
755 case SO_LINGER:
756 lv = sizeof(v.ling);
757 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
758 v.ling.l_linger = sk->sk_lingertime / HZ;
759 break;
760
761 case SO_BSDCOMPAT:
762 sock_warn_obsolete_bsdism("getsockopt");
763 break;
764
765 case SO_TIMESTAMP:
92f37fd2
ED		 766 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
767 !sock_flag(sk, SOCK_RCVTSTAMPNS);
768 break;
769
770 case SO_TIMESTAMPNS:
771 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 772 break;
773
774 case SO_RCVTIMEO:
775 lv=sizeof(struct timeval);
776 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
777 v.tm.tv_sec = 0;
778 v.tm.tv_usec = 0;
779 } else {
780 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
781 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
782 }
783 break;
784
785 case SO_SNDTIMEO:
786 lv=sizeof(struct timeval);
787 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
788 v.tm.tv_sec = 0;
789 v.tm.tv_usec = 0;
790 } else {
791 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
792 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
793 }
794 break;
1da177e4 795
e71a4783
SH		 796 case SO_RCVLOWAT:
797 v.val = sk->sk_rcvlowat;
798 break;
1da177e4 799
e71a4783
SH		 800 case SO_SNDLOWAT:
801 v.val=1;
802 break;
1da177e4 803
e71a4783
SH		 804 case SO_PASSCRED:
805 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
806 break;
1da177e4 807
e71a4783
SH		 808 case SO_PEERCRED:
809 if (len > sizeof(sk->sk_peercred))
810 len = sizeof(sk->sk_peercred);
811 if (copy_to_user(optval, &sk->sk_peercred, len))
812 return -EFAULT;
813 goto lenout;
1da177e4 814
e71a4783
SH		 815 case SO_PEERNAME:
816 {
817 char address[128];
818
819 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
820 return -ENOTCONN;
821 if (lv < len)
822 return -EINVAL;
823 if (copy_to_user(optval, address, len))
824 return -EFAULT;
825 goto lenout;
826 }
1da177e4 827
e71a4783
SH		 828 /* Dubious BSD thing... Probably nobody even uses it, but
829 * the UNIX standard wants it for whatever reason... -DaveM
830 */
831 case SO_ACCEPTCONN:
832 v.val = sk->sk_state == TCP_LISTEN;
833 break;
1da177e4 834
e71a4783
SH		 835 case SO_PASSSEC:
836 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
837 break;
877ce7c1 838
e71a4783
SH		 839 case SO_PEERSEC:
840 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 841
e71a4783
SH		 842 default:
843 return -ENOPROTOOPT;
1da177e4 844 }
e71a4783 845
1da177e4
LT		 846 if (len > lv)
847 len = lv;
848 if (copy_to_user(optval, &v, len))
849 return -EFAULT;
850lenout:
4ec93edb
YH		 851 if (put_user(len, optlen))
852 return -EFAULT;
853 return 0;
1da177e4
LT		 854}
855
a5b5bb9a
IM		 856/*
857 * Initialize an sk_lock.
858 *
859 * (We also register the sk_lock with the lock validator.)
860 */
b6f99a21 861static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 862{
ed07536e
PZ		 863 sock_lock_init_class_and_name(sk,
864 af_family_slock_key_strings[sk->sk_family],
865 af_family_slock_keys + sk->sk_family,
866 af_family_key_strings[sk->sk_family],
867 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 868}
869
1da177e4
LT		 870/**
871 * sk_alloc - All socket objects are allocated here
c4ea43c5 872 * @net: the applicable net namespace
4dc3b16b
PP		 873 * @family: protocol family
874 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
875 * @prot: struct proto associated with this new sock instance
876 * @zero_it: if we should zero the newly allocated sock
1da177e4 877 */
1b8d7ae4 878struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
86a76caf 879 struct proto *prot, int zero_it)
1da177e4
LT		 880{
881 struct sock *sk = NULL;
e18b890b 882 struct kmem_cache *slab = prot->slab;
1da177e4
LT		 883
884 if (slab != NULL)
885 sk = kmem_cache_alloc(slab, priority);
886 else
887 sk = kmalloc(prot->obj_size, priority);
888
889 if (sk) {
890 if (zero_it) {
891 memset(sk, 0, prot->obj_size);
892 sk->sk_family = family;
476e19cf
ACM		 893 /*
894 * See comment in struct sock definition to understand
895 * why we need sk_prot_creator -acme
896 */
897 sk->sk_prot = sk->sk_prot_creator = prot;
1da177e4 898 sock_lock_init(sk);
1b8d7ae4 899 sk->sk_net = get_net(net);
1da177e4 900 }
4ec93edb 901
a79af59e
FF		 902 if (security_sk_alloc(sk, family, priority))
903 goto out_free;
904
905 if (!try_module_get(prot->owner))
906 goto out_free;
1da177e4
LT		 907 }
908 return sk;
a79af59e
FF		 909
910out_free:
911 if (slab != NULL)
912 kmem_cache_free(slab, sk);
913 else
914 kfree(sk);
915 return NULL;
1da177e4
LT		 916}
917
918void sk_free(struct sock *sk)
919{
920 struct sk_filter *filter;
476e19cf 921 struct module *owner = sk->sk_prot_creator->owner;
1da177e4
LT		 922
923 if (sk->sk_destruct)
924 sk->sk_destruct(sk);
925
fda9ef5d 926 filter = rcu_dereference(sk->sk_filter);
1da177e4
LT		 927 if (filter) {
928 sk_filter_release(sk, filter);
fda9ef5d 929 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 930 }
931
932 sock_disable_timestamp(sk);
933
934 if (atomic_read(&sk->sk_omem_alloc))
935 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
936 __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
937
938 security_sk_free(sk);
1b8d7ae4 939 put_net(sk->sk_net);
476e19cf
ACM		 940 if (sk->sk_prot_creator->slab != NULL)
941 kmem_cache_free(sk->sk_prot_creator->slab, sk);
1da177e4
LT		 942 else
943 kfree(sk);
944 module_put(owner);
945}
946
dd0fc66f 947struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 948{
1b8d7ae4 949 struct sock *newsk = sk_alloc(sk->sk_net, sk->sk_family, priority, sk->sk_prot, 0);
87d11ceb
ACM		 950
951 if (newsk != NULL) {
952 struct sk_filter *filter;
953
892c141e 954 sock_copy(newsk, sk);
87d11ceb
ACM		 955
956 /* SANITY */
957 sk_node_init(&newsk->sk_node);
958 sock_lock_init(newsk);
959 bh_lock_sock(newsk);
fa438ccf 960 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
87d11ceb
ACM		 961
962 atomic_set(&newsk->sk_rmem_alloc, 0);
963 atomic_set(&newsk->sk_wmem_alloc, 0);
964 atomic_set(&newsk->sk_omem_alloc, 0);
965 skb_queue_head_init(&newsk->sk_receive_queue);
966 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 967#ifdef CONFIG_NET_DMA
968 skb_queue_head_init(&newsk->sk_async_wait_queue);
969#endif
87d11ceb
ACM		 970
971 rwlock_init(&newsk->sk_dst_lock);
972 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 973 lockdep_set_class_and_name(&newsk->sk_callback_lock,
974 af_callback_keys + newsk->sk_family,
975 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 976
977 newsk->sk_dst_cache = NULL;
978 newsk->sk_wmem_queued = 0;
979 newsk->sk_forward_alloc = 0;
980 newsk->sk_send_head = NULL;
87d11ceb
ACM		 981 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
982
983 sock_reset_flag(newsk, SOCK_DONE);
984 skb_queue_head_init(&newsk->sk_error_queue);
985
986 filter = newsk->sk_filter;
987 if (filter != NULL)
988 sk_filter_charge(newsk, filter);
989
990 if (unlikely(xfrm_sk_clone_policy(newsk))) {
991 /* It is still raw copy of parent, so invalidate
992 * destructor and make plain sk_free() */
993 newsk->sk_destruct = NULL;
994 sk_free(newsk);
995 newsk = NULL;
996 goto out;
997 }
998
999 newsk->sk_err = 0;
1000 newsk->sk_priority = 0;
1001 atomic_set(&newsk->sk_refcnt, 2);
1002
1003 /*
1004 * Increment the counter in the same struct proto as the master
1005 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1006 * is the same as sk->sk_prot->socks, as this field was copied
1007 * with memcpy).
1008 *
1009 * This _changes_ the previous behaviour, where
1010 * tcp_create_openreq_child always was incrementing the
1011 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1012 * to be taken into account in all callers. -acme
1013 */
1014 sk_refcnt_debug_inc(newsk);
1015 newsk->sk_socket = NULL;
1016 newsk->sk_sleep = NULL;
1017
1018 if (newsk->sk_prot->sockets_allocated)
1019 atomic_inc(newsk->sk_prot->sockets_allocated);
1020 }
1021out:
1022 return newsk;
1023}
1024
1025EXPORT_SYMBOL_GPL(sk_clone);
1026
9958089a
AK		 1027void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1028{
1029 __sk_dst_set(sk, dst);
1030 sk->sk_route_caps = dst->dev->features;
1031 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1032 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
9958089a
AK		 1033 if (sk_can_gso(sk)) {
1034 if (dst->header_len)
1035 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1036 else
1037 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1038 }
1039}
1040EXPORT_SYMBOL_GPL(sk_setup_caps);
1041
1da177e4
LT		 1042void __init sk_init(void)
1043{
1044 if (num_physpages <= 4096) {
1045 sysctl_wmem_max = 32767;
1046 sysctl_rmem_max = 32767;
1047 sysctl_wmem_default = 32767;
1048 sysctl_rmem_default = 32767;
1049 } else if (num_physpages >= 131072) {
1050 sysctl_wmem_max = 131071;
1051 sysctl_rmem_max = 131071;
1052 }
1053}
1054
1055/*
1056 * Simple resource managers for sockets.
1057 */
1058
1059
4ec93edb
YH		 1060/*
1061 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1062 */
1063void sock_wfree(struct sk_buff *skb)
1064{
1065 struct sock *sk = skb->sk;
1066
1067 /* In case it might be waiting for more memory. */
1068 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1069 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1070 sk->sk_write_space(sk);
1071 sock_put(sk);
1072}
1073
4ec93edb
YH		 1074/*
1075 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1076 */
1077void sock_rfree(struct sk_buff *skb)
1078{
1079 struct sock *sk = skb->sk;
1080
1081 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1082}
1083
1084
1085int sock_i_uid(struct sock *sk)
1086{
1087 int uid;
1088
1089 read_lock(&sk->sk_callback_lock);
1090 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1091 read_unlock(&sk->sk_callback_lock);
1092 return uid;
1093}
1094
1095unsigned long sock_i_ino(struct sock *sk)
1096{
1097 unsigned long ino;
1098
1099 read_lock(&sk->sk_callback_lock);
1100 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1101 read_unlock(&sk->sk_callback_lock);
1102 return ino;
1103}
1104
1105/*
1106 * Allocate a skb from the socket's send buffer.
1107 */
86a76caf 1108struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1109 gfp_t priority)
1da177e4
LT		 1110{
1111 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1112 struct sk_buff * skb = alloc_skb(size, priority);
1113 if (skb) {
1114 skb_set_owner_w(skb, sk);
1115 return skb;
1116 }
1117 }
1118 return NULL;
1119}
1120
1121/*
1122 * Allocate a skb from the socket's receive buffer.
4ec93edb 1123 */
86a76caf 1124struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1125 gfp_t priority)
1da177e4
LT		 1126{
1127 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1128 struct sk_buff *skb = alloc_skb(size, priority);
1129 if (skb) {
1130 skb_set_owner_r(skb, sk);
1131 return skb;
1132 }
1133 }
1134 return NULL;
1135}
1136
4ec93edb 1137/*
1da177e4 1138 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1139 */
dd0fc66f 1140void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1141{
1142 if ((unsigned)size <= sysctl_optmem_max &&
1143 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1144 void *mem;
1145 /* First do the add, to avoid the race if kmalloc
4ec93edb 1146 * might sleep.
1da177e4
LT		 1147 */
1148 atomic_add(size, &sk->sk_omem_alloc);
1149 mem = kmalloc(size, priority);
1150 if (mem)
1151 return mem;
1152 atomic_sub(size, &sk->sk_omem_alloc);
1153 }
1154 return NULL;
1155}
1156
1157/*
1158 * Free an option memory block.
1159 */
1160void sock_kfree_s(struct sock *sk, void *mem, int size)
1161{
1162 kfree(mem);
1163 atomic_sub(size, &sk->sk_omem_alloc);
1164}
1165
1166/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1167 I think, these locks should be removed for datagram sockets.
1168 */
1169static long sock_wait_for_wmem(struct sock * sk, long timeo)
1170{
1171 DEFINE_WAIT(wait);
1172
1173 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1174 for (;;) {
1175 if (!timeo)
1176 break;
1177 if (signal_pending(current))
1178 break;
1179 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1180 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1181 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1182 break;
1183 if (sk->sk_shutdown & SEND_SHUTDOWN)
1184 break;
1185 if (sk->sk_err)
1186 break;
1187 timeo = schedule_timeout(timeo);
1188 }
1189 finish_wait(sk->sk_sleep, &wait);
1190 return timeo;
1191}
1192
1193
1194/*
1195 * Generic send/receive buffer handlers
1196 */
1197
1198static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1199 unsigned long header_len,
1200 unsigned long data_len,
1201 int noblock, int *errcode)
1202{
1203 struct sk_buff *skb;
7d877f3b 1204 gfp_t gfp_mask;
1da177e4
LT		 1205 long timeo;
1206 int err;
1207
1208 gfp_mask = sk->sk_allocation;
1209 if (gfp_mask & __GFP_WAIT)
1210 gfp_mask |= __GFP_REPEAT;
1211
1212 timeo = sock_sndtimeo(sk, noblock);
1213 while (1) {
1214 err = sock_error(sk);
1215 if (err != 0)
1216 goto failure;
1217
1218 err = -EPIPE;
1219 if (sk->sk_shutdown & SEND_SHUTDOWN)
1220 goto failure;
1221
1222 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1223 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1224 if (skb) {
1225 int npages;
1226 int i;
1227
1228 /* No pages, we're done... */
1229 if (!data_len)
1230 break;
1231
1232 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1233 skb->truesize += data_len;
1234 skb_shinfo(skb)->nr_frags = npages;
1235 for (i = 0; i < npages; i++) {
1236 struct page *page;
1237 skb_frag_t *frag;
1238
1239 page = alloc_pages(sk->sk_allocation, 0);
1240 if (!page) {
1241 err = -ENOBUFS;
1242 skb_shinfo(skb)->nr_frags = i;
1243 kfree_skb(skb);
1244 goto failure;
1245 }
1246
1247 frag = &skb_shinfo(skb)->frags[i];
1248 frag->page = page;
1249 frag->page_offset = 0;
1250 frag->size = (data_len >= PAGE_SIZE ?
1251 PAGE_SIZE :
1252 data_len);
1253 data_len -= PAGE_SIZE;
1254 }
1255
1256 /* Full success... */
1257 break;
1258 }
1259 err = -ENOBUFS;
1260 goto failure;
1261 }
1262 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1263 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1264 err = -EAGAIN;
1265 if (!timeo)
1266 goto failure;
1267 if (signal_pending(current))
1268 goto interrupted;
1269 timeo = sock_wait_for_wmem(sk, timeo);
1270 }
1271
1272 skb_set_owner_w(skb, sk);
1273 return skb;
1274
1275interrupted:
1276 err = sock_intr_errno(timeo);
1277failure:
1278 *errcode = err;
1279 return NULL;
1280}
1281
4ec93edb 1282struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1283 int noblock, int *errcode)
1284{
1285 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1286}
1287
1288static void __lock_sock(struct sock *sk)
1289{
1290 DEFINE_WAIT(wait);
1291
e71a4783 1292 for (;;) {
1da177e4
LT		 1293 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1294 TASK_UNINTERRUPTIBLE);
1295 spin_unlock_bh(&sk->sk_lock.slock);
1296 schedule();
1297 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1298 if (!sock_owned_by_user(sk))
1da177e4
LT		 1299 break;
1300 }
1301 finish_wait(&sk->sk_lock.wq, &wait);
1302}
1303
1304static void __release_sock(struct sock *sk)
1305{
1306 struct sk_buff *skb = sk->sk_backlog.head;
1307
1308 do {
1309 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1310 bh_unlock_sock(sk);
1311
1312 do {
1313 struct sk_buff *next = skb->next;
1314
1315 skb->next = NULL;
1316 sk->sk_backlog_rcv(sk, skb);
1317
1318 /*
1319 * We are in process context here with softirqs
1320 * disabled, use cond_resched_softirq() to preempt.
1321 * This is safe to do because we've taken the backlog
1322 * queue private:
1323 */
1324 cond_resched_softirq();
1325
1326 skb = next;
1327 } while (skb != NULL);
1328
1329 bh_lock_sock(sk);
e71a4783 1330 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1331}
1332
1333/**
1334 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1335 * @sk: sock to wait on
1336 * @timeo: for how long
1da177e4
LT		 1337 *
1338 * Now socket state including sk->sk_err is changed only under lock,
1339 * hence we may omit checks after joining wait queue.
1340 * We check receive queue before schedule() only as optimization;
1341 * it is very likely that release_sock() added new data.
1342 */
1343int sk_wait_data(struct sock *sk, long *timeo)
1344{
1345 int rc;
1346 DEFINE_WAIT(wait);
1347
1348 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1349 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1350 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1351 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1352 finish_wait(sk->sk_sleep, &wait);
1353 return rc;
1354}
1355
1356EXPORT_SYMBOL(sk_wait_data);
1357
1358/*
1359 * Set of default routines for initialising struct proto_ops when
1360 * the protocol does not support a particular function. In certain
1361 * cases where it makes no sense for a protocol to have a "do nothing"
1362 * function, some default processing is provided.
1363 */
1364
1365int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1366{
1367 return -EOPNOTSUPP;
1368}
1369
4ec93edb 1370int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1371 int len, int flags)
1372{
1373 return -EOPNOTSUPP;
1374}
1375
1376int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1377{
1378 return -EOPNOTSUPP;
1379}
1380
1381int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1382{
1383 return -EOPNOTSUPP;
1384}
1385
4ec93edb 1386int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1387 int *len, int peer)
1388{
1389 return -EOPNOTSUPP;
1390}
1391
1392unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1393{
1394 return 0;
1395}
1396
1397int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1398{
1399 return -EOPNOTSUPP;
1400}
1401
1402int sock_no_listen(struct socket *sock, int backlog)
1403{
1404 return -EOPNOTSUPP;
1405}
1406
1407int sock_no_shutdown(struct socket *sock, int how)
1408{
1409 return -EOPNOTSUPP;
1410}
1411
1412int sock_no_setsockopt(struct socket *sock, int level, int optname,
1413 char __user *optval, int optlen)
1414{
1415 return -EOPNOTSUPP;
1416}
1417
1418int sock_no_getsockopt(struct socket *sock, int level, int optname,
1419 char __user *optval, int __user *optlen)
1420{
1421 return -EOPNOTSUPP;
1422}
1423
1424int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1425 size_t len)
1426{
1427 return -EOPNOTSUPP;
1428}
1429
1430int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1431 size_t len, int flags)
1432{
1433 return -EOPNOTSUPP;
1434}
1435
1436int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1437{
1438 /* Mirror missing mmap method error code */
1439 return -ENODEV;
1440}
1441
1442ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1443{
1444 ssize_t res;
1445 struct msghdr msg = {.msg_flags = flags};
1446 struct kvec iov;
1447 char *kaddr = kmap(page);
1448 iov.iov_base = kaddr + offset;
1449 iov.iov_len = size;
1450 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1451 kunmap(page);
1452 return res;
1453}
1454
1455/*
1456 * Default Socket Callbacks
1457 */
1458
1459static void sock_def_wakeup(struct sock *sk)
1460{
1461 read_lock(&sk->sk_callback_lock);
1462 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1463 wake_up_interruptible_all(sk->sk_sleep);
1464 read_unlock(&sk->sk_callback_lock);
1465}
1466
1467static void sock_def_error_report(struct sock *sk)
1468{
1469 read_lock(&sk->sk_callback_lock);
1470 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1471 wake_up_interruptible(sk->sk_sleep);
4ec93edb 1472 sk_wake_async(sk,0,POLL_ERR);
1da177e4
LT		 1473 read_unlock(&sk->sk_callback_lock);
1474}
1475
1476static void sock_def_readable(struct sock *sk, int len)
1477{
1478 read_lock(&sk->sk_callback_lock);
1479 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1480 wake_up_interruptible(sk->sk_sleep);
1481 sk_wake_async(sk,1,POLL_IN);
1482 read_unlock(&sk->sk_callback_lock);
1483}
1484
1485static void sock_def_write_space(struct sock *sk)
1486{
1487 read_lock(&sk->sk_callback_lock);
1488
1489 /* Do not wake up a writer until he can make "significant"
1490 * progress. --DaveM
1491 */
e71a4783 1492 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1da177e4
LT		 1493 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1494 wake_up_interruptible(sk->sk_sleep);
1495
1496 /* Should agree with poll, otherwise some programs break */
1497 if (sock_writeable(sk))
1498 sk_wake_async(sk, 2, POLL_OUT);
1499 }
1500
1501 read_unlock(&sk->sk_callback_lock);
1502}
1503
1504static void sock_def_destruct(struct sock *sk)
1505{
a51482bd 1506 kfree(sk->sk_protinfo);
1da177e4
LT		 1507}
1508
1509void sk_send_sigurg(struct sock *sk)
1510{
1511 if (sk->sk_socket && sk->sk_socket->file)
1512 if (send_sigurg(&sk->sk_socket->file->f_owner))
1513 sk_wake_async(sk, 3, POLL_PRI);
1514}
1515
1516void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1517 unsigned long expires)
1518{
1519 if (!mod_timer(timer, expires))
1520 sock_hold(sk);
1521}
1522
1523EXPORT_SYMBOL(sk_reset_timer);
1524
1525void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1526{
1527 if (timer_pending(timer) && del_timer(timer))
1528 __sock_put(sk);
1529}
1530
1531EXPORT_SYMBOL(sk_stop_timer);
1532
1533void sock_init_data(struct socket *sock, struct sock *sk)
1534{
1535 skb_queue_head_init(&sk->sk_receive_queue);
1536 skb_queue_head_init(&sk->sk_write_queue);
1537 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1538#ifdef CONFIG_NET_DMA
1539 skb_queue_head_init(&sk->sk_async_wait_queue);
1540#endif
1da177e4
LT		 1541
1542 sk->sk_send_head = NULL;
1543
1544 init_timer(&sk->sk_timer);
4ec93edb 1545
1da177e4
LT		 1546 sk->sk_allocation = GFP_KERNEL;
1547 sk->sk_rcvbuf = sysctl_rmem_default;
1548 sk->sk_sndbuf = sysctl_wmem_default;
1549 sk->sk_state = TCP_CLOSE;
1550 sk->sk_socket = sock;
1551
1552 sock_set_flag(sk, SOCK_ZAPPED);
1553
e71a4783 1554 if (sock) {
1da177e4
LT		 1555 sk->sk_type = sock->type;
1556 sk->sk_sleep = &sock->wait;
1557 sock->sk = sk;
1558 } else
1559 sk->sk_sleep = NULL;
1560
1561 rwlock_init(&sk->sk_dst_lock);
1562 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1563 lockdep_set_class_and_name(&sk->sk_callback_lock,
1564 af_callback_keys + sk->sk_family,
1565 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1566
1567 sk->sk_state_change = sock_def_wakeup;
1568 sk->sk_data_ready = sock_def_readable;
1569 sk->sk_write_space = sock_def_write_space;
1570 sk->sk_error_report = sock_def_error_report;
1571 sk->sk_destruct = sock_def_destruct;
1572
1573 sk->sk_sndmsg_page = NULL;
1574 sk->sk_sndmsg_off = 0;
1575
1576 sk->sk_peercred.pid = 0;
1577 sk->sk_peercred.uid = -1;
1578 sk->sk_peercred.gid = -1;
1579 sk->sk_write_pending = 0;
1580 sk->sk_rcvlowat = 1;
1581 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1582 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1583
b7aa0bf7 1584 sk->sk_stamp = ktime_set(-1L, -1L);
1da177e4
LT		 1585
1586 atomic_set(&sk->sk_refcnt, 1);
1587}
1588
fcc70d5f 1589void fastcall lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1590{
1591 might_sleep();
a5b5bb9a 1592 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1593 if (sk->sk_lock.owned)
1da177e4 1594 __lock_sock(sk);
d2e9117c 1595 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1596 spin_unlock(&sk->sk_lock.slock);
1597 /*
1598 * The sk_lock has mutex_lock() semantics here:
1599 */
fcc70d5f 1600 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1601 local_bh_enable();
1da177e4
LT		 1602}
1603
fcc70d5f 1604EXPORT_SYMBOL(lock_sock_nested);
1da177e4
LT		 1605
1606void fastcall release_sock(struct sock *sk)
1607{
a5b5bb9a
IM		 1608 /*
1609 * The sk_lock has mutex_unlock() semantics:
1610 */
1611 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1612
1613 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1614 if (sk->sk_backlog.tail)
1615 __release_sock(sk);
d2e9117c 1616 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1617 if (waitqueue_active(&sk->sk_lock.wq))
1618 wake_up(&sk->sk_lock.wq);
1619 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1620}
1621EXPORT_SYMBOL(release_sock);
1622
1623int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1624{
b7aa0bf7 1625 struct timeval tv;
1da177e4
LT		 1626 if (!sock_flag(sk, SOCK_TIMESTAMP))
1627 sock_enable_timestamp(sk);
b7aa0bf7
ED		 1628 tv = ktime_to_timeval(sk->sk_stamp);
1629 if (tv.tv_sec == -1)
1da177e4 1630 return -ENOENT;
b7aa0bf7
ED		 1631 if (tv.tv_sec == 0) {
1632 sk->sk_stamp = ktime_get_real();
1633 tv = ktime_to_timeval(sk->sk_stamp);
1634 }
1635 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1636}
1da177e4
LT		 1637EXPORT_SYMBOL(sock_get_timestamp);
1638
ae40eb1e
ED		 1639int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1640{
1641 struct timespec ts;
1642 if (!sock_flag(sk, SOCK_TIMESTAMP))
1643 sock_enable_timestamp(sk);
1644 ts = ktime_to_timespec(sk->sk_stamp);
1645 if (ts.tv_sec == -1)
1646 return -ENOENT;
1647 if (ts.tv_sec == 0) {
1648 sk->sk_stamp = ktime_get_real();
1649 ts = ktime_to_timespec(sk->sk_stamp);
1650 }
1651 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1652}
1653EXPORT_SYMBOL(sock_get_timestampns);
1654
1da177e4 1655void sock_enable_timestamp(struct sock *sk)
4ec93edb
YH		 1656{
1657 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 1658 sock_set_flag(sk, SOCK_TIMESTAMP);
1659 net_enable_timestamp();
1660 }
1661}
4ec93edb 1662EXPORT_SYMBOL(sock_enable_timestamp);
1da177e4
LT		 1663
1664/*
1665 * Get a socket option on an socket.
1666 *
1667 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1668 * asynchronous errors should be reported by getsockopt. We assume
1669 * this means if you specify SO_ERROR (otherwise whats the point of it).
1670 */
1671int sock_common_getsockopt(struct socket *sock, int level, int optname,
1672 char __user *optval, int __user *optlen)
1673{
1674 struct sock *sk = sock->sk;
1675
1676 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1677}
1678
1679EXPORT_SYMBOL(sock_common_getsockopt);
1680
3fdadf7d 1681#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1682int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1683 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1684{
1685 struct sock *sk = sock->sk;
1686
1e51f951 1687 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 1688 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1689 optval, optlen);
3fdadf7d
DM		 1690 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1691}
1692EXPORT_SYMBOL(compat_sock_common_getsockopt);
1693#endif
1694
1da177e4
LT		 1695int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1696 struct msghdr *msg, size_t size, int flags)
1697{
1698 struct sock *sk = sock->sk;
1699 int addr_len = 0;
1700 int err;
1701
1702 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1703 flags & ~MSG_DONTWAIT, &addr_len);
1704 if (err >= 0)
1705 msg->msg_namelen = addr_len;
1706 return err;
1707}
1708
1709EXPORT_SYMBOL(sock_common_recvmsg);
1710
1711/*
1712 * Set socket options on an inet socket.
1713 */
1714int sock_common_setsockopt(struct socket *sock, int level, int optname,
1715 char __user *optval, int optlen)
1716{
1717 struct sock *sk = sock->sk;
1718
1719 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1720}
1721
1722EXPORT_SYMBOL(sock_common_setsockopt);
1723
3fdadf7d 1724#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1725int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1726 char __user *optval, int optlen)
3fdadf7d
DM		 1727{
1728 struct sock *sk = sock->sk;
1729
543d9cfe
ACM		 1730 if (sk->sk_prot->compat_setsockopt != NULL)
1731 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1732 optval, optlen);
3fdadf7d
DM		 1733 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1734}
1735EXPORT_SYMBOL(compat_sock_common_setsockopt);
1736#endif
1737
1da177e4
LT		 1738void sk_common_release(struct sock *sk)
1739{
1740 if (sk->sk_prot->destroy)
1741 sk->sk_prot->destroy(sk);
1742
1743 /*
1744 * Observation: when sock_common_release is called, processes have
1745 * no access to socket. But net still has.
1746 * Step one, detach it from networking:
1747 *
1748 * A. Remove from hash tables.
1749 */
1750
1751 sk->sk_prot->unhash(sk);
1752
1753 /*
1754 * In this point socket cannot receive new packets, but it is possible
1755 * that some packets are in flight because some CPU runs receiver and
1756 * did hash table lookup before we unhashed socket. They will achieve
1757 * receive queue and will be purged by socket destructor.
1758 *
1759 * Also we still have packets pending on receive queue and probably,
1760 * our own packets waiting in device queues. sock_destroy will drain
1761 * receive queue, but transmitted packets will delay socket destruction
1762 * until the last reference will be released.
1763 */
1764
1765 sock_orphan(sk);
1766
1767 xfrm_sk_free_policy(sk);
1768
e6848976 1769 sk_refcnt_debug_release(sk);
1da177e4
LT		 1770 sock_put(sk);
1771}
1772
1773EXPORT_SYMBOL(sk_common_release);
1774
1775static DEFINE_RWLOCK(proto_list_lock);
1776static LIST_HEAD(proto_list);
1777
1778int proto_register(struct proto *prot, int alloc_slab)
1779{
8feaf0c0
ACM		 1780 char *request_sock_slab_name = NULL;
1781 char *timewait_sock_slab_name;
1da177e4
LT		 1782 int rc = -ENOBUFS;
1783
1da177e4
LT		 1784 if (alloc_slab) {
1785 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
20c2df83 1786 SLAB_HWCACHE_ALIGN, NULL);
1da177e4
LT		 1787
1788 if (prot->slab == NULL) {
1789 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
1790 prot->name);
2a278051 1791 goto out;
1da177e4 1792 }
2e6599cb
ACM		 1793
1794 if (prot->rsk_prot != NULL) {
1795 static const char mask[] = "request_sock_%s";
1796
1797 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1798 if (request_sock_slab_name == NULL)
1799 goto out_free_sock_slab;
1800
1801 sprintf(request_sock_slab_name, mask, prot->name);
1802 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
1803 prot->rsk_prot->obj_size, 0,
20c2df83 1804 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 1805
1806 if (prot->rsk_prot->slab == NULL) {
1807 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
1808 prot->name);
1809 goto out_free_request_sock_slab_name;
1810 }
1811 }
8feaf0c0 1812
6d6ee43e 1813 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 1814 static const char mask[] = "tw_sock_%s";
1815
1816 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1817
1818 if (timewait_sock_slab_name == NULL)
1819 goto out_free_request_sock_slab;
1820
1821 sprintf(timewait_sock_slab_name, mask, prot->name);
6d6ee43e
ACM		 1822 prot->twsk_prot->twsk_slab =
1823 kmem_cache_create(timewait_sock_slab_name,
1824 prot->twsk_prot->twsk_obj_size,
1825 0, SLAB_HWCACHE_ALIGN,
20c2df83 1826 NULL);
6d6ee43e 1827 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 1828 goto out_free_timewait_sock_slab_name;
1829 }
1da177e4
LT		 1830 }
1831
2a278051 1832 write_lock(&proto_list_lock);
1da177e4 1833 list_add(&prot->node, &proto_list);
1da177e4 1834 write_unlock(&proto_list_lock);
2a278051
ACM		 1835 rc = 0;
1836out:
1da177e4 1837 return rc;
8feaf0c0
ACM		 1838out_free_timewait_sock_slab_name:
1839 kfree(timewait_sock_slab_name);
1840out_free_request_sock_slab:
1841 if (prot->rsk_prot && prot->rsk_prot->slab) {
1842 kmem_cache_destroy(prot->rsk_prot->slab);
1843 prot->rsk_prot->slab = NULL;
1844 }
2e6599cb
ACM		 1845out_free_request_sock_slab_name:
1846 kfree(request_sock_slab_name);
1847out_free_sock_slab:
1848 kmem_cache_destroy(prot->slab);
1849 prot->slab = NULL;
1850 goto out;
1da177e4
LT		 1851}
1852
1853EXPORT_SYMBOL(proto_register);
1854
1855void proto_unregister(struct proto *prot)
1856{
1857 write_lock(&proto_list_lock);
0a3f4358
PM		 1858 list_del(&prot->node);
1859 write_unlock(&proto_list_lock);
1da177e4
LT		 1860
1861 if (prot->slab != NULL) {
1862 kmem_cache_destroy(prot->slab);
1863 prot->slab = NULL;
1864 }
1865
2e6599cb
ACM		 1866 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
1867 const char *name = kmem_cache_name(prot->rsk_prot->slab);
1868
1869 kmem_cache_destroy(prot->rsk_prot->slab);
1870 kfree(name);
1871 prot->rsk_prot->slab = NULL;
1872 }
1873
6d6ee43e
ACM		 1874 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
1875 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
8feaf0c0 1876
6d6ee43e 1877 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
8feaf0c0 1878 kfree(name);
6d6ee43e 1879 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 1880 }
1da177e4
LT		 1881}
1882
1883EXPORT_SYMBOL(proto_unregister);
1884
1885#ifdef CONFIG_PROC_FS
1da177e4
LT		 1886static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
1887{
1888 read_lock(&proto_list_lock);
60f0438a 1889 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 1890}
1891
1892static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1893{
60f0438a 1894 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 1895}
1896
1897static void proto_seq_stop(struct seq_file *seq, void *v)
1898{
1899 read_unlock(&proto_list_lock);
1900}
1901
1902static char proto_method_implemented(const void *method)
1903{
1904 return method == NULL ? 'n' : 'y';
1905}
1906
1907static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
1908{
1909 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
1910 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
1911 proto->name,
1912 proto->obj_size,
1913 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
1914 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
1915 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
1916 proto->max_header,
1917 proto->slab == NULL ? "no" : "yes",
1918 module_name(proto->owner),
1919 proto_method_implemented(proto->close),
1920 proto_method_implemented(proto->connect),
1921 proto_method_implemented(proto->disconnect),
1922 proto_method_implemented(proto->accept),
1923 proto_method_implemented(proto->ioctl),
1924 proto_method_implemented(proto->init),
1925 proto_method_implemented(proto->destroy),
1926 proto_method_implemented(proto->shutdown),
1927 proto_method_implemented(proto->setsockopt),
1928 proto_method_implemented(proto->getsockopt),
1929 proto_method_implemented(proto->sendmsg),
1930 proto_method_implemented(proto->recvmsg),
1931 proto_method_implemented(proto->sendpage),
1932 proto_method_implemented(proto->bind),
1933 proto_method_implemented(proto->backlog_rcv),
1934 proto_method_implemented(proto->hash),
1935 proto_method_implemented(proto->unhash),
1936 proto_method_implemented(proto->get_port),
1937 proto_method_implemented(proto->enter_memory_pressure));
1938}
1939
1940static int proto_seq_show(struct seq_file *seq, void *v)
1941{
60f0438a 1942 if (v == &proto_list)
1da177e4
LT		 1943 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
1944 "protocol",
1945 "size",
1946 "sockets",
1947 "memory",
1948 "press",
1949 "maxhdr",
1950 "slab",
1951 "module",
1952 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
1953 else
60f0438a 1954 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 1955 return 0;
1956}
1957
f690808e 1958static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 1959 .start = proto_seq_start,
1960 .next = proto_seq_next,
1961 .stop = proto_seq_stop,
1962 .show = proto_seq_show,
1963};
1964
1965static int proto_seq_open(struct inode *inode, struct file *file)
1966{
1967 return seq_open(file, &proto_seq_ops);
1968}
1969
9a32144e 1970static const struct file_operations proto_seq_fops = {
1da177e4
LT		 1971 .owner = THIS_MODULE,
1972 .open = proto_seq_open,
1973 .read = seq_read,
1974 .llseek = seq_lseek,
1975 .release = seq_release,
1976};
1977
1978static int __init proto_init(void)
1979{
1980 /* register /proc/net/protocols */
457c4cbc 1981 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
1da177e4
LT		 1982}
1983
1984subsys_initcall(proto_init);
1985
1986#endif /* PROC_FS */
1987
1988EXPORT_SYMBOL(sk_alloc);
1989EXPORT_SYMBOL(sk_free);
1990EXPORT_SYMBOL(sk_send_sigurg);
1991EXPORT_SYMBOL(sock_alloc_send_skb);
1992EXPORT_SYMBOL(sock_init_data);
1993EXPORT_SYMBOL(sock_kfree_s);
1994EXPORT_SYMBOL(sock_kmalloc);
1995EXPORT_SYMBOL(sock_no_accept);
1996EXPORT_SYMBOL(sock_no_bind);
1997EXPORT_SYMBOL(sock_no_connect);
1998EXPORT_SYMBOL(sock_no_getname);
1999EXPORT_SYMBOL(sock_no_getsockopt);
2000EXPORT_SYMBOL(sock_no_ioctl);
2001EXPORT_SYMBOL(sock_no_listen);
2002EXPORT_SYMBOL(sock_no_mmap);
2003EXPORT_SYMBOL(sock_no_poll);
2004EXPORT_SYMBOL(sock_no_recvmsg);
2005EXPORT_SYMBOL(sock_no_sendmsg);
2006EXPORT_SYMBOL(sock_no_sendpage);
2007EXPORT_SYMBOL(sock_no_setsockopt);
2008EXPORT_SYMBOL(sock_no_shutdown);
2009EXPORT_SYMBOL(sock_no_socketpair);
2010EXPORT_SYMBOL(sock_rfree);
2011EXPORT_SYMBOL(sock_setsockopt);
2012EXPORT_SYMBOL(sock_wfree);
2013EXPORT_SYMBOL(sock_wmalloc);
2014EXPORT_SYMBOL(sock_i_uid);
2015EXPORT_SYMBOL(sock_i_ino);
1da177e4 2016EXPORT_SYMBOL(sysctl_optmem_max);
6baf1f41 2017#ifdef CONFIG_SYSCTL
1da177e4
LT		 2018EXPORT_SYMBOL(sysctl_rmem_max);
2019EXPORT_SYMBOL(sysctl_wmem_max);
2020#endif
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