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docbook/mcabook: fixup x86 path/file names
[GitHub/mt8127/android_kernel_alcatel_ttab.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
4dc3b16b
PP		 872 * @family: protocol family
873 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
874 * @prot: struct proto associated with this new sock instance
875 * @zero_it: if we should zero the newly allocated sock
1da177e4 876 */
1b8d7ae4 877struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
86a76caf 878 struct proto *prot, int zero_it)
1da177e4
LT		 879{
880 struct sock *sk = NULL;
e18b890b 881 struct kmem_cache *slab = prot->slab;
1da177e4
LT		 882
883 if (slab != NULL)
884 sk = kmem_cache_alloc(slab, priority);
885 else
886 sk = kmalloc(prot->obj_size, priority);
887
888 if (sk) {
889 if (zero_it) {
890 memset(sk, 0, prot->obj_size);
891 sk->sk_family = family;
476e19cf
ACM		 892 /*
893 * See comment in struct sock definition to understand
894 * why we need sk_prot_creator -acme
895 */
896 sk->sk_prot = sk->sk_prot_creator = prot;
1da177e4 897 sock_lock_init(sk);
1b8d7ae4 898 sk->sk_net = get_net(net);
1da177e4 899 }
4ec93edb 900
a79af59e
FF		 901 if (security_sk_alloc(sk, family, priority))
902 goto out_free;
903
904 if (!try_module_get(prot->owner))
905 goto out_free;
1da177e4
LT		 906 }
907 return sk;
a79af59e
FF		 908
909out_free:
910 if (slab != NULL)
911 kmem_cache_free(slab, sk);
912 else
913 kfree(sk);
914 return NULL;
1da177e4
LT		 915}
916
917void sk_free(struct sock *sk)
918{
919 struct sk_filter *filter;
476e19cf 920 struct module *owner = sk->sk_prot_creator->owner;
1da177e4
LT		 921
922 if (sk->sk_destruct)
923 sk->sk_destruct(sk);
924
fda9ef5d 925 filter = rcu_dereference(sk->sk_filter);
1da177e4
LT		 926 if (filter) {
927 sk_filter_release(sk, filter);
fda9ef5d 928 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 929 }
930
931 sock_disable_timestamp(sk);
932
933 if (atomic_read(&sk->sk_omem_alloc))
934 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
935 __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
936
937 security_sk_free(sk);
1b8d7ae4 938 put_net(sk->sk_net);
476e19cf
ACM		 939 if (sk->sk_prot_creator->slab != NULL)
940 kmem_cache_free(sk->sk_prot_creator->slab, sk);
1da177e4
LT		 941 else
942 kfree(sk);
943 module_put(owner);
944}
945
dd0fc66f 946struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 947{
1b8d7ae4 948 struct sock *newsk = sk_alloc(sk->sk_net, sk->sk_family, priority, sk->sk_prot, 0);
87d11ceb
ACM		 949
950 if (newsk != NULL) {
951 struct sk_filter *filter;
952
892c141e 953 sock_copy(newsk, sk);
87d11ceb
ACM		 954
955 /* SANITY */
956 sk_node_init(&newsk->sk_node);
957 sock_lock_init(newsk);
958 bh_lock_sock(newsk);
fa438ccf 959 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
87d11ceb
ACM		 960
961 atomic_set(&newsk->sk_rmem_alloc, 0);
962 atomic_set(&newsk->sk_wmem_alloc, 0);
963 atomic_set(&newsk->sk_omem_alloc, 0);
964 skb_queue_head_init(&newsk->sk_receive_queue);
965 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 966#ifdef CONFIG_NET_DMA
967 skb_queue_head_init(&newsk->sk_async_wait_queue);
968#endif
87d11ceb
ACM		 969
970 rwlock_init(&newsk->sk_dst_lock);
971 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 972 lockdep_set_class_and_name(&newsk->sk_callback_lock,
973 af_callback_keys + newsk->sk_family,
974 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 975
976 newsk->sk_dst_cache = NULL;
977 newsk->sk_wmem_queued = 0;
978 newsk->sk_forward_alloc = 0;
979 newsk->sk_send_head = NULL;
87d11ceb
ACM		 980 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
981
982 sock_reset_flag(newsk, SOCK_DONE);
983 skb_queue_head_init(&newsk->sk_error_queue);
984
985 filter = newsk->sk_filter;
986 if (filter != NULL)
987 sk_filter_charge(newsk, filter);
988
989 if (unlikely(xfrm_sk_clone_policy(newsk))) {
990 /* It is still raw copy of parent, so invalidate
991 * destructor and make plain sk_free() */
992 newsk->sk_destruct = NULL;
993 sk_free(newsk);
994 newsk = NULL;
995 goto out;
996 }
997
998 newsk->sk_err = 0;
999 newsk->sk_priority = 0;
1000 atomic_set(&newsk->sk_refcnt, 2);
1001
1002 /*
1003 * Increment the counter in the same struct proto as the master
1004 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1005 * is the same as sk->sk_prot->socks, as this field was copied
1006 * with memcpy).
1007 *
1008 * This _changes_ the previous behaviour, where
1009 * tcp_create_openreq_child always was incrementing the
1010 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1011 * to be taken into account in all callers. -acme
1012 */
1013 sk_refcnt_debug_inc(newsk);
1014 newsk->sk_socket = NULL;
1015 newsk->sk_sleep = NULL;
1016
1017 if (newsk->sk_prot->sockets_allocated)
1018 atomic_inc(newsk->sk_prot->sockets_allocated);
1019 }
1020out:
1021 return newsk;
1022}
1023
1024EXPORT_SYMBOL_GPL(sk_clone);
1025
9958089a
AK		 1026void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1027{
1028 __sk_dst_set(sk, dst);
1029 sk->sk_route_caps = dst->dev->features;
1030 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1031 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
9958089a
AK		 1032 if (sk_can_gso(sk)) {
1033 if (dst->header_len)
1034 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1035 else
1036 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1037 }
1038}
1039EXPORT_SYMBOL_GPL(sk_setup_caps);
1040
1da177e4
LT		 1041void __init sk_init(void)
1042{
1043 if (num_physpages <= 4096) {
1044 sysctl_wmem_max = 32767;
1045 sysctl_rmem_max = 32767;
1046 sysctl_wmem_default = 32767;
1047 sysctl_rmem_default = 32767;
1048 } else if (num_physpages >= 131072) {
1049 sysctl_wmem_max = 131071;
1050 sysctl_rmem_max = 131071;
1051 }
1052}
1053
1054/*
1055 * Simple resource managers for sockets.
1056 */
1057
1058
4ec93edb
YH		 1059/*
1060 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1061 */
1062void sock_wfree(struct sk_buff *skb)
1063{
1064 struct sock *sk = skb->sk;
1065
1066 /* In case it might be waiting for more memory. */
1067 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1068 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1069 sk->sk_write_space(sk);
1070 sock_put(sk);
1071}
1072
4ec93edb
YH		 1073/*
1074 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1075 */
1076void sock_rfree(struct sk_buff *skb)
1077{
1078 struct sock *sk = skb->sk;
1079
1080 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1081}
1082
1083
1084int sock_i_uid(struct sock *sk)
1085{
1086 int uid;
1087
1088 read_lock(&sk->sk_callback_lock);
1089 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1090 read_unlock(&sk->sk_callback_lock);
1091 return uid;
1092}
1093
1094unsigned long sock_i_ino(struct sock *sk)
1095{
1096 unsigned long ino;
1097
1098 read_lock(&sk->sk_callback_lock);
1099 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1100 read_unlock(&sk->sk_callback_lock);
1101 return ino;
1102}
1103
1104/*
1105 * Allocate a skb from the socket's send buffer.
1106 */
86a76caf 1107struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1108 gfp_t priority)
1da177e4
LT		 1109{
1110 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1111 struct sk_buff * skb = alloc_skb(size, priority);
1112 if (skb) {
1113 skb_set_owner_w(skb, sk);
1114 return skb;
1115 }
1116 }
1117 return NULL;
1118}
1119
1120/*
1121 * Allocate a skb from the socket's receive buffer.
4ec93edb 1122 */
86a76caf 1123struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1124 gfp_t priority)
1da177e4
LT		 1125{
1126 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1127 struct sk_buff *skb = alloc_skb(size, priority);
1128 if (skb) {
1129 skb_set_owner_r(skb, sk);
1130 return skb;
1131 }
1132 }
1133 return NULL;
1134}
1135
4ec93edb 1136/*
1da177e4 1137 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1138 */
dd0fc66f 1139void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1140{
1141 if ((unsigned)size <= sysctl_optmem_max &&
1142 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1143 void *mem;
1144 /* First do the add, to avoid the race if kmalloc
4ec93edb 1145 * might sleep.
1da177e4
LT		 1146 */
1147 atomic_add(size, &sk->sk_omem_alloc);
1148 mem = kmalloc(size, priority);
1149 if (mem)
1150 return mem;
1151 atomic_sub(size, &sk->sk_omem_alloc);
1152 }
1153 return NULL;
1154}
1155
1156/*
1157 * Free an option memory block.
1158 */
1159void sock_kfree_s(struct sock *sk, void *mem, int size)
1160{
1161 kfree(mem);
1162 atomic_sub(size, &sk->sk_omem_alloc);
1163}
1164
1165/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1166 I think, these locks should be removed for datagram sockets.
1167 */
1168static long sock_wait_for_wmem(struct sock * sk, long timeo)
1169{
1170 DEFINE_WAIT(wait);
1171
1172 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1173 for (;;) {
1174 if (!timeo)
1175 break;
1176 if (signal_pending(current))
1177 break;
1178 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1179 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1180 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1181 break;
1182 if (sk->sk_shutdown & SEND_SHUTDOWN)
1183 break;
1184 if (sk->sk_err)
1185 break;
1186 timeo = schedule_timeout(timeo);
1187 }
1188 finish_wait(sk->sk_sleep, &wait);
1189 return timeo;
1190}
1191
1192
1193/*
1194 * Generic send/receive buffer handlers
1195 */
1196
1197static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1198 unsigned long header_len,
1199 unsigned long data_len,
1200 int noblock, int *errcode)
1201{
1202 struct sk_buff *skb;
7d877f3b 1203 gfp_t gfp_mask;
1da177e4
LT		 1204 long timeo;
1205 int err;
1206
1207 gfp_mask = sk->sk_allocation;
1208 if (gfp_mask & __GFP_WAIT)
1209 gfp_mask |= __GFP_REPEAT;
1210
1211 timeo = sock_sndtimeo(sk, noblock);
1212 while (1) {
1213 err = sock_error(sk);
1214 if (err != 0)
1215 goto failure;
1216
1217 err = -EPIPE;
1218 if (sk->sk_shutdown & SEND_SHUTDOWN)
1219 goto failure;
1220
1221 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1222 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1223 if (skb) {
1224 int npages;
1225 int i;
1226
1227 /* No pages, we're done... */
1228 if (!data_len)
1229 break;
1230
1231 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1232 skb->truesize += data_len;
1233 skb_shinfo(skb)->nr_frags = npages;
1234 for (i = 0; i < npages; i++) {
1235 struct page *page;
1236 skb_frag_t *frag;
1237
1238 page = alloc_pages(sk->sk_allocation, 0);
1239 if (!page) {
1240 err = -ENOBUFS;
1241 skb_shinfo(skb)->nr_frags = i;
1242 kfree_skb(skb);
1243 goto failure;
1244 }
1245
1246 frag = &skb_shinfo(skb)->frags[i];
1247 frag->page = page;
1248 frag->page_offset = 0;
1249 frag->size = (data_len >= PAGE_SIZE ?
1250 PAGE_SIZE :
1251 data_len);
1252 data_len -= PAGE_SIZE;
1253 }
1254
1255 /* Full success... */
1256 break;
1257 }
1258 err = -ENOBUFS;
1259 goto failure;
1260 }
1261 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1262 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1263 err = -EAGAIN;
1264 if (!timeo)
1265 goto failure;
1266 if (signal_pending(current))
1267 goto interrupted;
1268 timeo = sock_wait_for_wmem(sk, timeo);
1269 }
1270
1271 skb_set_owner_w(skb, sk);
1272 return skb;
1273
1274interrupted:
1275 err = sock_intr_errno(timeo);
1276failure:
1277 *errcode = err;
1278 return NULL;
1279}
1280
4ec93edb 1281struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1282 int noblock, int *errcode)
1283{
1284 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1285}
1286
1287static void __lock_sock(struct sock *sk)
1288{
1289 DEFINE_WAIT(wait);
1290
e71a4783 1291 for (;;) {
1da177e4
LT		 1292 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1293 TASK_UNINTERRUPTIBLE);
1294 spin_unlock_bh(&sk->sk_lock.slock);
1295 schedule();
1296 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1297 if (!sock_owned_by_user(sk))
1da177e4
LT		 1298 break;
1299 }
1300 finish_wait(&sk->sk_lock.wq, &wait);
1301}
1302
1303static void __release_sock(struct sock *sk)
1304{
1305 struct sk_buff *skb = sk->sk_backlog.head;
1306
1307 do {
1308 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1309 bh_unlock_sock(sk);
1310
1311 do {
1312 struct sk_buff *next = skb->next;
1313
1314 skb->next = NULL;
1315 sk->sk_backlog_rcv(sk, skb);
1316
1317 /*
1318 * We are in process context here with softirqs
1319 * disabled, use cond_resched_softirq() to preempt.
1320 * This is safe to do because we've taken the backlog
1321 * queue private:
1322 */
1323 cond_resched_softirq();
1324
1325 skb = next;
1326 } while (skb != NULL);
1327
1328 bh_lock_sock(sk);
e71a4783 1329 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1330}
1331
1332/**
1333 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1334 * @sk: sock to wait on
1335 * @timeo: for how long
1da177e4
LT		 1336 *
1337 * Now socket state including sk->sk_err is changed only under lock,
1338 * hence we may omit checks after joining wait queue.
1339 * We check receive queue before schedule() only as optimization;
1340 * it is very likely that release_sock() added new data.
1341 */
1342int sk_wait_data(struct sock *sk, long *timeo)
1343{
1344 int rc;
1345 DEFINE_WAIT(wait);
1346
1347 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1348 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1349 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1350 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1351 finish_wait(sk->sk_sleep, &wait);
1352 return rc;
1353}
1354
1355EXPORT_SYMBOL(sk_wait_data);
1356
1357/*
1358 * Set of default routines for initialising struct proto_ops when
1359 * the protocol does not support a particular function. In certain
1360 * cases where it makes no sense for a protocol to have a "do nothing"
1361 * function, some default processing is provided.
1362 */
1363
1364int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1365{
1366 return -EOPNOTSUPP;
1367}
1368
4ec93edb 1369int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1370 int len, int flags)
1371{
1372 return -EOPNOTSUPP;
1373}
1374
1375int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1376{
1377 return -EOPNOTSUPP;
1378}
1379
1380int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1381{
1382 return -EOPNOTSUPP;
1383}
1384
4ec93edb 1385int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1386 int *len, int peer)
1387{
1388 return -EOPNOTSUPP;
1389}
1390
1391unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1392{
1393 return 0;
1394}
1395
1396int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1397{
1398 return -EOPNOTSUPP;
1399}
1400
1401int sock_no_listen(struct socket *sock, int backlog)
1402{
1403 return -EOPNOTSUPP;
1404}
1405
1406int sock_no_shutdown(struct socket *sock, int how)
1407{
1408 return -EOPNOTSUPP;
1409}
1410
1411int sock_no_setsockopt(struct socket *sock, int level, int optname,
1412 char __user *optval, int optlen)
1413{
1414 return -EOPNOTSUPP;
1415}
1416
1417int sock_no_getsockopt(struct socket *sock, int level, int optname,
1418 char __user *optval, int __user *optlen)
1419{
1420 return -EOPNOTSUPP;
1421}
1422
1423int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1424 size_t len)
1425{
1426 return -EOPNOTSUPP;
1427}
1428
1429int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1430 size_t len, int flags)
1431{
1432 return -EOPNOTSUPP;
1433}
1434
1435int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1436{
1437 /* Mirror missing mmap method error code */
1438 return -ENODEV;
1439}
1440
1441ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1442{
1443 ssize_t res;
1444 struct msghdr msg = {.msg_flags = flags};
1445 struct kvec iov;
1446 char *kaddr = kmap(page);
1447 iov.iov_base = kaddr + offset;
1448 iov.iov_len = size;
1449 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1450 kunmap(page);
1451 return res;
1452}
1453
1454/*
1455 * Default Socket Callbacks
1456 */
1457
1458static void sock_def_wakeup(struct sock *sk)
1459{
1460 read_lock(&sk->sk_callback_lock);
1461 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1462 wake_up_interruptible_all(sk->sk_sleep);
1463 read_unlock(&sk->sk_callback_lock);
1464}
1465
1466static void sock_def_error_report(struct sock *sk)
1467{
1468 read_lock(&sk->sk_callback_lock);
1469 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1470 wake_up_interruptible(sk->sk_sleep);
4ec93edb 1471 sk_wake_async(sk,0,POLL_ERR);
1da177e4
LT		 1472 read_unlock(&sk->sk_callback_lock);
1473}
1474
1475static void sock_def_readable(struct sock *sk, int len)
1476{
1477 read_lock(&sk->sk_callback_lock);
1478 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1479 wake_up_interruptible(sk->sk_sleep);
1480 sk_wake_async(sk,1,POLL_IN);
1481 read_unlock(&sk->sk_callback_lock);
1482}
1483
1484static void sock_def_write_space(struct sock *sk)
1485{
1486 read_lock(&sk->sk_callback_lock);
1487
1488 /* Do not wake up a writer until he can make "significant"
1489 * progress. --DaveM
1490 */
e71a4783 1491 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1da177e4
LT		 1492 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1493 wake_up_interruptible(sk->sk_sleep);
1494
1495 /* Should agree with poll, otherwise some programs break */
1496 if (sock_writeable(sk))
1497 sk_wake_async(sk, 2, POLL_OUT);
1498 }
1499
1500 read_unlock(&sk->sk_callback_lock);
1501}
1502
1503static void sock_def_destruct(struct sock *sk)
1504{
a51482bd 1505 kfree(sk->sk_protinfo);
1da177e4
LT		 1506}
1507
1508void sk_send_sigurg(struct sock *sk)
1509{
1510 if (sk->sk_socket && sk->sk_socket->file)
1511 if (send_sigurg(&sk->sk_socket->file->f_owner))
1512 sk_wake_async(sk, 3, POLL_PRI);
1513}
1514
1515void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1516 unsigned long expires)
1517{
1518 if (!mod_timer(timer, expires))
1519 sock_hold(sk);
1520}
1521
1522EXPORT_SYMBOL(sk_reset_timer);
1523
1524void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1525{
1526 if (timer_pending(timer) && del_timer(timer))
1527 __sock_put(sk);
1528}
1529
1530EXPORT_SYMBOL(sk_stop_timer);
1531
1532void sock_init_data(struct socket *sock, struct sock *sk)
1533{
1534 skb_queue_head_init(&sk->sk_receive_queue);
1535 skb_queue_head_init(&sk->sk_write_queue);
1536 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1537#ifdef CONFIG_NET_DMA
1538 skb_queue_head_init(&sk->sk_async_wait_queue);
1539#endif
1da177e4
LT		 1540
1541 sk->sk_send_head = NULL;
1542
1543 init_timer(&sk->sk_timer);
4ec93edb 1544
1da177e4
LT		 1545 sk->sk_allocation = GFP_KERNEL;
1546 sk->sk_rcvbuf = sysctl_rmem_default;
1547 sk->sk_sndbuf = sysctl_wmem_default;
1548 sk->sk_state = TCP_CLOSE;
1549 sk->sk_socket = sock;
1550
1551 sock_set_flag(sk, SOCK_ZAPPED);
1552
e71a4783 1553 if (sock) {
1da177e4
LT		 1554 sk->sk_type = sock->type;
1555 sk->sk_sleep = &sock->wait;
1556 sock->sk = sk;
1557 } else
1558 sk->sk_sleep = NULL;
1559
1560 rwlock_init(&sk->sk_dst_lock);
1561 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1562 lockdep_set_class_and_name(&sk->sk_callback_lock,
1563 af_callback_keys + sk->sk_family,
1564 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1565
1566 sk->sk_state_change = sock_def_wakeup;
1567 sk->sk_data_ready = sock_def_readable;
1568 sk->sk_write_space = sock_def_write_space;
1569 sk->sk_error_report = sock_def_error_report;
1570 sk->sk_destruct = sock_def_destruct;
1571
1572 sk->sk_sndmsg_page = NULL;
1573 sk->sk_sndmsg_off = 0;
1574
1575 sk->sk_peercred.pid = 0;
1576 sk->sk_peercred.uid = -1;
1577 sk->sk_peercred.gid = -1;
1578 sk->sk_write_pending = 0;
1579 sk->sk_rcvlowat = 1;
1580 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1581 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1582
b7aa0bf7 1583 sk->sk_stamp = ktime_set(-1L, -1L);
1da177e4
LT		 1584
1585 atomic_set(&sk->sk_refcnt, 1);
1586}
1587
fcc70d5f 1588void fastcall lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1589{
1590 might_sleep();
a5b5bb9a 1591 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1592 if (sk->sk_lock.owned)
1da177e4 1593 __lock_sock(sk);
d2e9117c 1594 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1595 spin_unlock(&sk->sk_lock.slock);
1596 /*
1597 * The sk_lock has mutex_lock() semantics here:
1598 */
fcc70d5f 1599 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1600 local_bh_enable();
1da177e4
LT		 1601}
1602
fcc70d5f 1603EXPORT_SYMBOL(lock_sock_nested);
1da177e4
LT		 1604
1605void fastcall release_sock(struct sock *sk)
1606{
a5b5bb9a
IM		 1607 /*
1608 * The sk_lock has mutex_unlock() semantics:
1609 */
1610 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1611
1612 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1613 if (sk->sk_backlog.tail)
1614 __release_sock(sk);
d2e9117c 1615 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1616 if (waitqueue_active(&sk->sk_lock.wq))
1617 wake_up(&sk->sk_lock.wq);
1618 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1619}
1620EXPORT_SYMBOL(release_sock);
1621
1622int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1623{
b7aa0bf7 1624 struct timeval tv;
1da177e4
LT		 1625 if (!sock_flag(sk, SOCK_TIMESTAMP))
1626 sock_enable_timestamp(sk);
b7aa0bf7
ED		 1627 tv = ktime_to_timeval(sk->sk_stamp);
1628 if (tv.tv_sec == -1)
1da177e4 1629 return -ENOENT;
b7aa0bf7
ED		 1630 if (tv.tv_sec == 0) {
1631 sk->sk_stamp = ktime_get_real();
1632 tv = ktime_to_timeval(sk->sk_stamp);
1633 }
1634 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1635}
1da177e4
LT		 1636EXPORT_SYMBOL(sock_get_timestamp);
1637
ae40eb1e
ED		 1638int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1639{
1640 struct timespec ts;
1641 if (!sock_flag(sk, SOCK_TIMESTAMP))
1642 sock_enable_timestamp(sk);
1643 ts = ktime_to_timespec(sk->sk_stamp);
1644 if (ts.tv_sec == -1)
1645 return -ENOENT;
1646 if (ts.tv_sec == 0) {
1647 sk->sk_stamp = ktime_get_real();
1648 ts = ktime_to_timespec(sk->sk_stamp);
1649 }
1650 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1651}
1652EXPORT_SYMBOL(sock_get_timestampns);
1653
1da177e4 1654void sock_enable_timestamp(struct sock *sk)
4ec93edb
YH		 1655{
1656 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 1657 sock_set_flag(sk, SOCK_TIMESTAMP);
1658 net_enable_timestamp();
1659 }
1660}
4ec93edb 1661EXPORT_SYMBOL(sock_enable_timestamp);
1da177e4
LT		 1662
1663/*
1664 * Get a socket option on an socket.
1665 *
1666 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1667 * asynchronous errors should be reported by getsockopt. We assume
1668 * this means if you specify SO_ERROR (otherwise whats the point of it).
1669 */
1670int sock_common_getsockopt(struct socket *sock, int level, int optname,
1671 char __user *optval, int __user *optlen)
1672{
1673 struct sock *sk = sock->sk;
1674
1675 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1676}
1677
1678EXPORT_SYMBOL(sock_common_getsockopt);
1679
3fdadf7d 1680#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1681int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1682 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1683{
1684 struct sock *sk = sock->sk;
1685
1e51f951 1686 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 1687 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1688 optval, optlen);
3fdadf7d
DM		 1689 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1690}
1691EXPORT_SYMBOL(compat_sock_common_getsockopt);
1692#endif
1693
1da177e4
LT		 1694int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1695 struct msghdr *msg, size_t size, int flags)
1696{
1697 struct sock *sk = sock->sk;
1698 int addr_len = 0;
1699 int err;
1700
1701 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1702 flags & ~MSG_DONTWAIT, &addr_len);
1703 if (err >= 0)
1704 msg->msg_namelen = addr_len;
1705 return err;
1706}
1707
1708EXPORT_SYMBOL(sock_common_recvmsg);
1709
1710/*
1711 * Set socket options on an inet socket.
1712 */
1713int sock_common_setsockopt(struct socket *sock, int level, int optname,
1714 char __user *optval, int optlen)
1715{
1716 struct sock *sk = sock->sk;
1717
1718 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1719}
1720
1721EXPORT_SYMBOL(sock_common_setsockopt);
1722
3fdadf7d 1723#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1724int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1725 char __user *optval, int optlen)
3fdadf7d
DM		 1726{
1727 struct sock *sk = sock->sk;
1728
543d9cfe
ACM		 1729 if (sk->sk_prot->compat_setsockopt != NULL)
1730 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1731 optval, optlen);
3fdadf7d
DM		 1732 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1733}
1734EXPORT_SYMBOL(compat_sock_common_setsockopt);
1735#endif
1736
1da177e4
LT		 1737void sk_common_release(struct sock *sk)
1738{
1739 if (sk->sk_prot->destroy)
1740 sk->sk_prot->destroy(sk);
1741
1742 /*
1743 * Observation: when sock_common_release is called, processes have
1744 * no access to socket. But net still has.
1745 * Step one, detach it from networking:
1746 *
1747 * A. Remove from hash tables.
1748 */
1749
1750 sk->sk_prot->unhash(sk);
1751
1752 /*
1753 * In this point socket cannot receive new packets, but it is possible
1754 * that some packets are in flight because some CPU runs receiver and
1755 * did hash table lookup before we unhashed socket. They will achieve
1756 * receive queue and will be purged by socket destructor.
1757 *
1758 * Also we still have packets pending on receive queue and probably,
1759 * our own packets waiting in device queues. sock_destroy will drain
1760 * receive queue, but transmitted packets will delay socket destruction
1761 * until the last reference will be released.
1762 */
1763
1764 sock_orphan(sk);
1765
1766 xfrm_sk_free_policy(sk);
1767
e6848976 1768 sk_refcnt_debug_release(sk);
1da177e4
LT		 1769 sock_put(sk);
1770}
1771
1772EXPORT_SYMBOL(sk_common_release);
1773
1774static DEFINE_RWLOCK(proto_list_lock);
1775static LIST_HEAD(proto_list);
1776
1777int proto_register(struct proto *prot, int alloc_slab)
1778{
8feaf0c0
ACM		 1779 char *request_sock_slab_name = NULL;
1780 char *timewait_sock_slab_name;
1da177e4
LT		 1781 int rc = -ENOBUFS;
1782
1da177e4
LT		 1783 if (alloc_slab) {
1784 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
20c2df83 1785 SLAB_HWCACHE_ALIGN, NULL);
1da177e4
LT		 1786
1787 if (prot->slab == NULL) {
1788 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
1789 prot->name);
2a278051 1790 goto out;
1da177e4 1791 }
2e6599cb
ACM		 1792
1793 if (prot->rsk_prot != NULL) {
1794 static const char mask[] = "request_sock_%s";
1795
1796 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1797 if (request_sock_slab_name == NULL)
1798 goto out_free_sock_slab;
1799
1800 sprintf(request_sock_slab_name, mask, prot->name);
1801 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
1802 prot->rsk_prot->obj_size, 0,
20c2df83 1803 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 1804
1805 if (prot->rsk_prot->slab == NULL) {
1806 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
1807 prot->name);
1808 goto out_free_request_sock_slab_name;
1809 }
1810 }
8feaf0c0 1811
6d6ee43e 1812 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 1813 static const char mask[] = "tw_sock_%s";
1814
1815 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1816
1817 if (timewait_sock_slab_name == NULL)
1818 goto out_free_request_sock_slab;
1819
1820 sprintf(timewait_sock_slab_name, mask, prot->name);
6d6ee43e
ACM		 1821 prot->twsk_prot->twsk_slab =
1822 kmem_cache_create(timewait_sock_slab_name,
1823 prot->twsk_prot->twsk_obj_size,
1824 0, SLAB_HWCACHE_ALIGN,
20c2df83 1825 NULL);
6d6ee43e 1826 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 1827 goto out_free_timewait_sock_slab_name;
1828 }
1da177e4
LT		 1829 }
1830
2a278051 1831 write_lock(&proto_list_lock);
1da177e4 1832 list_add(&prot->node, &proto_list);
1da177e4 1833 write_unlock(&proto_list_lock);
2a278051
ACM		 1834 rc = 0;
1835out:
1da177e4 1836 return rc;
8feaf0c0
ACM		 1837out_free_timewait_sock_slab_name:
1838 kfree(timewait_sock_slab_name);
1839out_free_request_sock_slab:
1840 if (prot->rsk_prot && prot->rsk_prot->slab) {
1841 kmem_cache_destroy(prot->rsk_prot->slab);
1842 prot->rsk_prot->slab = NULL;
1843 }
2e6599cb
ACM		 1844out_free_request_sock_slab_name:
1845 kfree(request_sock_slab_name);
1846out_free_sock_slab:
1847 kmem_cache_destroy(prot->slab);
1848 prot->slab = NULL;
1849 goto out;
1da177e4
LT		 1850}
1851
1852EXPORT_SYMBOL(proto_register);
1853
1854void proto_unregister(struct proto *prot)
1855{
1856 write_lock(&proto_list_lock);
0a3f4358
PM		 1857 list_del(&prot->node);
1858 write_unlock(&proto_list_lock);
1da177e4
LT		 1859
1860 if (prot->slab != NULL) {
1861 kmem_cache_destroy(prot->slab);
1862 prot->slab = NULL;
1863 }
1864
2e6599cb
ACM		 1865 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
1866 const char *name = kmem_cache_name(prot->rsk_prot->slab);
1867
1868 kmem_cache_destroy(prot->rsk_prot->slab);
1869 kfree(name);
1870 prot->rsk_prot->slab = NULL;
1871 }
1872
6d6ee43e
ACM		 1873 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
1874 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
8feaf0c0 1875
6d6ee43e 1876 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
8feaf0c0 1877 kfree(name);
6d6ee43e 1878 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 1879 }
1da177e4
LT		 1880}
1881
1882EXPORT_SYMBOL(proto_unregister);
1883
1884#ifdef CONFIG_PROC_FS
1da177e4
LT		 1885static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
1886{
1887 read_lock(&proto_list_lock);
60f0438a 1888 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 1889}
1890
1891static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1892{
60f0438a 1893 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 1894}
1895
1896static void proto_seq_stop(struct seq_file *seq, void *v)
1897{
1898 read_unlock(&proto_list_lock);
1899}
1900
1901static char proto_method_implemented(const void *method)
1902{
1903 return method == NULL ? 'n' : 'y';
1904}
1905
1906static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
1907{
1908 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
1909 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
1910 proto->name,
1911 proto->obj_size,
1912 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
1913 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
1914 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
1915 proto->max_header,
1916 proto->slab == NULL ? "no" : "yes",
1917 module_name(proto->owner),
1918 proto_method_implemented(proto->close),
1919 proto_method_implemented(proto->connect),
1920 proto_method_implemented(proto->disconnect),
1921 proto_method_implemented(proto->accept),
1922 proto_method_implemented(proto->ioctl),
1923 proto_method_implemented(proto->init),
1924 proto_method_implemented(proto->destroy),
1925 proto_method_implemented(proto->shutdown),
1926 proto_method_implemented(proto->setsockopt),
1927 proto_method_implemented(proto->getsockopt),
1928 proto_method_implemented(proto->sendmsg),
1929 proto_method_implemented(proto->recvmsg),
1930 proto_method_implemented(proto->sendpage),
1931 proto_method_implemented(proto->bind),
1932 proto_method_implemented(proto->backlog_rcv),
1933 proto_method_implemented(proto->hash),
1934 proto_method_implemented(proto->unhash),
1935 proto_method_implemented(proto->get_port),
1936 proto_method_implemented(proto->enter_memory_pressure));
1937}
1938
1939static int proto_seq_show(struct seq_file *seq, void *v)
1940{
60f0438a 1941 if (v == &proto_list)
1da177e4
LT		 1942 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
1943 "protocol",
1944 "size",
1945 "sockets",
1946 "memory",
1947 "press",
1948 "maxhdr",
1949 "slab",
1950 "module",
1951 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
1952 else
60f0438a 1953 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 1954 return 0;
1955}
1956
f690808e 1957static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 1958 .start = proto_seq_start,
1959 .next = proto_seq_next,
1960 .stop = proto_seq_stop,
1961 .show = proto_seq_show,
1962};
1963
1964static int proto_seq_open(struct inode *inode, struct file *file)
1965{
1966 return seq_open(file, &proto_seq_ops);
1967}
1968
9a32144e 1969static const struct file_operations proto_seq_fops = {
1da177e4
LT		 1970 .owner = THIS_MODULE,
1971 .open = proto_seq_open,
1972 .read = seq_read,
1973 .llseek = seq_lseek,
1974 .release = seq_release,
1975};
1976
1977static int __init proto_init(void)
1978{
1979 /* register /proc/net/protocols */
457c4cbc 1980 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
1da177e4
LT		 1981}
1982
1983subsys_initcall(proto_init);
1984
1985#endif /* PROC_FS */
1986
1987EXPORT_SYMBOL(sk_alloc);
1988EXPORT_SYMBOL(sk_free);
1989EXPORT_SYMBOL(sk_send_sigurg);
1990EXPORT_SYMBOL(sock_alloc_send_skb);
1991EXPORT_SYMBOL(sock_init_data);
1992EXPORT_SYMBOL(sock_kfree_s);
1993EXPORT_SYMBOL(sock_kmalloc);
1994EXPORT_SYMBOL(sock_no_accept);
1995EXPORT_SYMBOL(sock_no_bind);
1996EXPORT_SYMBOL(sock_no_connect);
1997EXPORT_SYMBOL(sock_no_getname);
1998EXPORT_SYMBOL(sock_no_getsockopt);
1999EXPORT_SYMBOL(sock_no_ioctl);
2000EXPORT_SYMBOL(sock_no_listen);
2001EXPORT_SYMBOL(sock_no_mmap);
2002EXPORT_SYMBOL(sock_no_poll);
2003EXPORT_SYMBOL(sock_no_recvmsg);
2004EXPORT_SYMBOL(sock_no_sendmsg);
2005EXPORT_SYMBOL(sock_no_sendpage);
2006EXPORT_SYMBOL(sock_no_setsockopt);
2007EXPORT_SYMBOL(sock_no_shutdown);
2008EXPORT_SYMBOL(sock_no_socketpair);
2009EXPORT_SYMBOL(sock_rfree);
2010EXPORT_SYMBOL(sock_setsockopt);
2011EXPORT_SYMBOL(sock_wfree);
2012EXPORT_SYMBOL(sock_wmalloc);
2013EXPORT_SYMBOL(sock_i_uid);
2014EXPORT_SYMBOL(sock_i_ino);
1da177e4 2015EXPORT_SYMBOL(sysctl_optmem_max);
6baf1f41 2016#ifdef CONFIG_SYSCTL
1da177e4
LT		 2017EXPORT_SYMBOL(sysctl_rmem_max);
2018EXPORT_SYMBOL(sysctl_wmem_max);
2019#endif
kernel source for telekom puls (alcatel/mediatek)