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[NET]: Make the sk_clone() lighter
[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",
ba25f9dc 235 current->comm, task_pid_nr(current));
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;
1da177e4
LT		 431 int val;
432 int valbool;
433 struct linger ling;
434 int ret = 0;
4ec93edb 435
1da177e4
LT		 436 /*
437 * Options without arguments
438 */
439
440#ifdef SO_DONTLINGER /* Compatibility item... */
a77be819
KM		 441 if (optname == SO_DONTLINGER) {
442 lock_sock(sk);
443 sock_reset_flag(sk, SOCK_LINGER);
444 release_sock(sk);
445 return 0;
1da177e4 446 }
a77be819 447#endif
4ec93edb 448
4878809f
DM		 449 if (optname == SO_BINDTODEVICE)
450 return sock_bindtodevice(sk, optval, optlen);
451
e71a4783
SH		 452 if (optlen < sizeof(int))
453 return -EINVAL;
4ec93edb 454
1da177e4
LT		 455 if (get_user(val, (int __user *)optval))
456 return -EFAULT;
4ec93edb
YH		 457
458 valbool = val?1:0;
1da177e4
LT		 459
460 lock_sock(sk);
461
e71a4783
SH		 462 switch(optname) {
463 case SO_DEBUG:
464 if (val && !capable(CAP_NET_ADMIN)) {
465 ret = -EACCES;
466 }
467 else if (valbool)
468 sock_set_flag(sk, SOCK_DBG);
469 else
470 sock_reset_flag(sk, SOCK_DBG);
471 break;
472 case SO_REUSEADDR:
473 sk->sk_reuse = valbool;
474 break;
475 case SO_TYPE:
476 case SO_ERROR:
477 ret = -ENOPROTOOPT;
478 break;
479 case SO_DONTROUTE:
480 if (valbool)
481 sock_set_flag(sk, SOCK_LOCALROUTE);
482 else
483 sock_reset_flag(sk, SOCK_LOCALROUTE);
484 break;
485 case SO_BROADCAST:
486 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
487 break;
488 case SO_SNDBUF:
489 /* Don't error on this BSD doesn't and if you think
490 about it this is right. Otherwise apps have to
491 play 'guess the biggest size' games. RCVBUF/SNDBUF
492 are treated in BSD as hints */
493
494 if (val > sysctl_wmem_max)
495 val = sysctl_wmem_max;
b0573dea 496set_sndbuf:
e71a4783
SH		 497 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
498 if ((val * 2) < SOCK_MIN_SNDBUF)
499 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
500 else
501 sk->sk_sndbuf = val * 2;
1da177e4 502
e71a4783
SH		 503 /*
504 * Wake up sending tasks if we
505 * upped the value.
506 */
507 sk->sk_write_space(sk);
508 break;
1da177e4 509
e71a4783
SH		 510 case SO_SNDBUFFORCE:
511 if (!capable(CAP_NET_ADMIN)) {
512 ret = -EPERM;
513 break;
514 }
515 goto set_sndbuf;
b0573dea 516
e71a4783
SH		 517 case SO_RCVBUF:
518 /* Don't error on this BSD doesn't and if you think
519 about it this is right. Otherwise apps have to
520 play 'guess the biggest size' games. RCVBUF/SNDBUF
521 are treated in BSD as hints */
4ec93edb 522
e71a4783
SH		 523 if (val > sysctl_rmem_max)
524 val = sysctl_rmem_max;
b0573dea 525set_rcvbuf:
e71a4783
SH		 526 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
527 /*
528 * We double it on the way in to account for
529 * "struct sk_buff" etc. overhead. Applications
530 * assume that the SO_RCVBUF setting they make will
531 * allow that much actual data to be received on that
532 * socket.
533 *
534 * Applications are unaware that "struct sk_buff" and
535 * other overheads allocate from the receive buffer
536 * during socket buffer allocation.
537 *
538 * And after considering the possible alternatives,
539 * returning the value we actually used in getsockopt
540 * is the most desirable behavior.
541 */
542 if ((val * 2) < SOCK_MIN_RCVBUF)
543 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
544 else
545 sk->sk_rcvbuf = val * 2;
546 break;
547
548 case SO_RCVBUFFORCE:
549 if (!capable(CAP_NET_ADMIN)) {
550 ret = -EPERM;
1da177e4 551 break;
e71a4783
SH		 552 }
553 goto set_rcvbuf;
1da177e4 554
e71a4783 555 case SO_KEEPALIVE:
1da177e4 556#ifdef CONFIG_INET
e71a4783
SH		 557 if (sk->sk_protocol == IPPROTO_TCP)
558 tcp_set_keepalive(sk, valbool);
1da177e4 559#endif
e71a4783
SH		 560 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
561 break;
562
563 case SO_OOBINLINE:
564 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
565 break;
566
567 case SO_NO_CHECK:
568 sk->sk_no_check = valbool;
569 break;
570
571 case SO_PRIORITY:
572 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
573 sk->sk_priority = val;
574 else
575 ret = -EPERM;
576 break;
577
578 case SO_LINGER:
579 if (optlen < sizeof(ling)) {
580 ret = -EINVAL; /* 1003.1g */
1da177e4 581 break;
e71a4783
SH		 582 }
583 if (copy_from_user(&ling,optval,sizeof(ling))) {
584 ret = -EFAULT;
1da177e4 585 break;
e71a4783
SH		 586 }
587 if (!ling.l_onoff)
588 sock_reset_flag(sk, SOCK_LINGER);
589 else {
1da177e4 590#if (BITS_PER_LONG == 32)
e71a4783
SH		 591 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
592 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 593 else
e71a4783
SH		 594#endif
595 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
596 sock_set_flag(sk, SOCK_LINGER);
597 }
598 break;
599
600 case SO_BSDCOMPAT:
601 sock_warn_obsolete_bsdism("setsockopt");
602 break;
603
604 case SO_PASSCRED:
605 if (valbool)
606 set_bit(SOCK_PASSCRED, &sock->flags);
607 else
608 clear_bit(SOCK_PASSCRED, &sock->flags);
609 break;
610
611 case SO_TIMESTAMP:
92f37fd2 612 case SO_TIMESTAMPNS:
e71a4783 613 if (valbool) {
92f37fd2
ED		 614 if (optname == SO_TIMESTAMP)
615 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
616 else
617 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 618 sock_set_flag(sk, SOCK_RCVTSTAMP);
619 sock_enable_timestamp(sk);
92f37fd2 620 } else {
e71a4783 621 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 622 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
623 }
e71a4783
SH		 624 break;
625
626 case SO_RCVLOWAT:
627 if (val < 0)
628 val = INT_MAX;
629 sk->sk_rcvlowat = val ? : 1;
630 break;
631
632 case SO_RCVTIMEO:
633 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
634 break;
635
636 case SO_SNDTIMEO:
637 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
638 break;
1da177e4 639
e71a4783
SH		 640 case SO_ATTACH_FILTER:
641 ret = -EINVAL;
642 if (optlen == sizeof(struct sock_fprog)) {
643 struct sock_fprog fprog;
1da177e4 644
e71a4783
SH		 645 ret = -EFAULT;
646 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 647 break;
e71a4783
SH		 648
649 ret = sk_attach_filter(&fprog, sk);
650 }
651 break;
652
653 case SO_DETACH_FILTER:
55b33325 654 ret = sk_detach_filter(sk);
e71a4783 655 break;
1da177e4 656
e71a4783
SH		 657 case SO_PASSSEC:
658 if (valbool)
659 set_bit(SOCK_PASSSEC, &sock->flags);
660 else
661 clear_bit(SOCK_PASSSEC, &sock->flags);
662 break;
877ce7c1 663
1da177e4
LT		 664 /* We implement the SO_SNDLOWAT etc to
665 not be settable (1003.1g 5.3) */
e71a4783
SH		 666 default:
667 ret = -ENOPROTOOPT;
668 break;
4ec93edb 669 }
1da177e4
LT		 670 release_sock(sk);
671 return ret;
672}
673
674
675int sock_getsockopt(struct socket *sock, int level, int optname,
676 char __user *optval, int __user *optlen)
677{
678 struct sock *sk = sock->sk;
4ec93edb 679
e71a4783 680 union {
4ec93edb
YH		 681 int val;
682 struct linger ling;
1da177e4
LT		 683 struct timeval tm;
684 } v;
4ec93edb 685
1da177e4
LT		 686 unsigned int lv = sizeof(int);
687 int len;
4ec93edb 688
e71a4783 689 if (get_user(len, optlen))
4ec93edb 690 return -EFAULT;
e71a4783 691 if (len < 0)
1da177e4 692 return -EINVAL;
4ec93edb 693
e71a4783
SH		 694 switch(optname) {
695 case SO_DEBUG:
696 v.val = sock_flag(sk, SOCK_DBG);
697 break;
698
699 case SO_DONTROUTE:
700 v.val = sock_flag(sk, SOCK_LOCALROUTE);
701 break;
702
703 case SO_BROADCAST:
704 v.val = !!sock_flag(sk, SOCK_BROADCAST);
705 break;
706
707 case SO_SNDBUF:
708 v.val = sk->sk_sndbuf;
709 break;
710
711 case SO_RCVBUF:
712 v.val = sk->sk_rcvbuf;
713 break;
714
715 case SO_REUSEADDR:
716 v.val = sk->sk_reuse;
717 break;
718
719 case SO_KEEPALIVE:
720 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
721 break;
722
723 case SO_TYPE:
724 v.val = sk->sk_type;
725 break;
726
727 case SO_ERROR:
728 v.val = -sock_error(sk);
729 if (v.val==0)
730 v.val = xchg(&sk->sk_err_soft, 0);
731 break;
732
733 case SO_OOBINLINE:
734 v.val = !!sock_flag(sk, SOCK_URGINLINE);
735 break;
736
737 case SO_NO_CHECK:
738 v.val = sk->sk_no_check;
739 break;
740
741 case SO_PRIORITY:
742 v.val = sk->sk_priority;
743 break;
744
745 case SO_LINGER:
746 lv = sizeof(v.ling);
747 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
748 v.ling.l_linger = sk->sk_lingertime / HZ;
749 break;
750
751 case SO_BSDCOMPAT:
752 sock_warn_obsolete_bsdism("getsockopt");
753 break;
754
755 case SO_TIMESTAMP:
92f37fd2
ED		 756 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
757 !sock_flag(sk, SOCK_RCVTSTAMPNS);
758 break;
759
760 case SO_TIMESTAMPNS:
761 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 762 break;
763
764 case SO_RCVTIMEO:
765 lv=sizeof(struct timeval);
766 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
767 v.tm.tv_sec = 0;
768 v.tm.tv_usec = 0;
769 } else {
770 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
771 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
772 }
773 break;
774
775 case SO_SNDTIMEO:
776 lv=sizeof(struct timeval);
777 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
778 v.tm.tv_sec = 0;
779 v.tm.tv_usec = 0;
780 } else {
781 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
782 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
783 }
784 break;
1da177e4 785
e71a4783
SH		 786 case SO_RCVLOWAT:
787 v.val = sk->sk_rcvlowat;
788 break;
1da177e4 789
e71a4783
SH		 790 case SO_SNDLOWAT:
791 v.val=1;
792 break;
1da177e4 793
e71a4783
SH		 794 case SO_PASSCRED:
795 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
796 break;
1da177e4 797
e71a4783
SH		 798 case SO_PEERCRED:
799 if (len > sizeof(sk->sk_peercred))
800 len = sizeof(sk->sk_peercred);
801 if (copy_to_user(optval, &sk->sk_peercred, len))
802 return -EFAULT;
803 goto lenout;
1da177e4 804
e71a4783
SH		 805 case SO_PEERNAME:
806 {
807 char address[128];
808
809 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
810 return -ENOTCONN;
811 if (lv < len)
812 return -EINVAL;
813 if (copy_to_user(optval, address, len))
814 return -EFAULT;
815 goto lenout;
816 }
1da177e4 817
e71a4783
SH		 818 /* Dubious BSD thing... Probably nobody even uses it, but
819 * the UNIX standard wants it for whatever reason... -DaveM
820 */
821 case SO_ACCEPTCONN:
822 v.val = sk->sk_state == TCP_LISTEN;
823 break;
1da177e4 824
e71a4783
SH		 825 case SO_PASSSEC:
826 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
827 break;
877ce7c1 828
e71a4783
SH		 829 case SO_PEERSEC:
830 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 831
e71a4783
SH		 832 default:
833 return -ENOPROTOOPT;
1da177e4 834 }
e71a4783 835
1da177e4
LT		 836 if (len > lv)
837 len = lv;
838 if (copy_to_user(optval, &v, len))
839 return -EFAULT;
840lenout:
4ec93edb
YH		 841 if (put_user(len, optlen))
842 return -EFAULT;
843 return 0;
1da177e4
LT		 844}
845
a5b5bb9a
IM		 846/*
847 * Initialize an sk_lock.
848 *
849 * (We also register the sk_lock with the lock validator.)
850 */
b6f99a21 851static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 852{
ed07536e
PZ		 853 sock_lock_init_class_and_name(sk,
854 af_family_slock_key_strings[sk->sk_family],
855 af_family_slock_keys + sk->sk_family,
856 af_family_key_strings[sk->sk_family],
857 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 858}
859
f1a6c4da
PE		 860static void sock_copy(struct sock *nsk, const struct sock *osk)
861{
862#ifdef CONFIG_SECURITY_NETWORK
863 void *sptr = nsk->sk_security;
864#endif
865
866 memcpy(nsk, osk, osk->sk_prot->obj_size);
f1a6c4da
PE		 867#ifdef CONFIG_SECURITY_NETWORK
868 nsk->sk_security = sptr;
869 security_sk_clone(osk, nsk);
870#endif
871}
872
2e4afe7b
PE		 873static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
874 int family)
c308c1b2
PE		 875{
876 struct sock *sk;
877 struct kmem_cache *slab;
878
879 slab = prot->slab;
880 if (slab != NULL)
881 sk = kmem_cache_alloc(slab, priority);
882 else
883 sk = kmalloc(prot->obj_size, priority);
884
2e4afe7b
PE		 885 if (sk != NULL) {
886 if (security_sk_alloc(sk, family, priority))
887 goto out_free;
888
889 if (!try_module_get(prot->owner))
890 goto out_free_sec;
891 }
892
c308c1b2 893 return sk;
2e4afe7b
PE		 894
895out_free_sec:
896 security_sk_free(sk);
897out_free:
898 if (slab != NULL)
899 kmem_cache_free(slab, sk);
900 else
901 kfree(sk);
902 return NULL;
c308c1b2
PE		 903}
904
905static void sk_prot_free(struct proto *prot, struct sock *sk)
906{
907 struct kmem_cache *slab;
2e4afe7b 908 struct module *owner;
c308c1b2 909
2e4afe7b 910 owner = prot->owner;
c308c1b2 911 slab = prot->slab;
2e4afe7b
PE		 912
913 security_sk_free(sk);
c308c1b2
PE		 914 if (slab != NULL)
915 kmem_cache_free(slab, sk);
916 else
917 kfree(sk);
2e4afe7b 918 module_put(owner);
c308c1b2
PE		 919}
920
1da177e4
LT		 921/**
922 * sk_alloc - All socket objects are allocated here
c4ea43c5 923 * @net: the applicable net namespace
4dc3b16b
PP		 924 * @family: protocol family
925 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
926 * @prot: struct proto associated with this new sock instance
927 * @zero_it: if we should zero the newly allocated sock
1da177e4 928 */
1b8d7ae4 929struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
86a76caf 930 struct proto *prot, int zero_it)
1da177e4 931{
c308c1b2 932 struct sock *sk;
1da177e4 933
3f0666ee
PE		 934 if (zero_it)
935 priority |= __GFP_ZERO;
936
2e4afe7b 937 sk = sk_prot_alloc(prot, priority, family);
1da177e4
LT		 938 if (sk) {
939 if (zero_it) {
1da177e4 940 sk->sk_family = family;
476e19cf
ACM		 941 /*
942 * See comment in struct sock definition to understand
943 * why we need sk_prot_creator -acme
944 */
945 sk->sk_prot = sk->sk_prot_creator = prot;
1da177e4 946 sock_lock_init(sk);
1b8d7ae4 947 sk->sk_net = get_net(net);
1da177e4 948 }
1da177e4 949 }
a79af59e 950
2e4afe7b 951 return sk;
1da177e4
LT		 952}
953
954void sk_free(struct sock *sk)
955{
956 struct sk_filter *filter;
1da177e4
LT		 957
958 if (sk->sk_destruct)
959 sk->sk_destruct(sk);
960
fda9ef5d 961 filter = rcu_dereference(sk->sk_filter);
1da177e4 962 if (filter) {
309dd5fc 963 sk_filter_uncharge(sk, filter);
fda9ef5d 964 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 965 }
966
967 sock_disable_timestamp(sk);
968
969 if (atomic_read(&sk->sk_omem_alloc))
970 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
971 __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
972
1b8d7ae4 973 put_net(sk->sk_net);
c308c1b2 974 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4
LT		 975}
976
dd0fc66f 977struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 978{
8fd1d178 979 struct sock *newsk;
87d11ceb 980
8fd1d178 981 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 982 if (newsk != NULL) {
983 struct sk_filter *filter;
984
892c141e 985 sock_copy(newsk, sk);
87d11ceb
ACM		 986
987 /* SANITY */
1e2e6b89 988 get_net(newsk->sk_net);
87d11ceb
ACM		 989 sk_node_init(&newsk->sk_node);
990 sock_lock_init(newsk);
991 bh_lock_sock(newsk);
fa438ccf 992 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
87d11ceb
ACM		 993
994 atomic_set(&newsk->sk_rmem_alloc, 0);
995 atomic_set(&newsk->sk_wmem_alloc, 0);
996 atomic_set(&newsk->sk_omem_alloc, 0);
997 skb_queue_head_init(&newsk->sk_receive_queue);
998 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 999#ifdef CONFIG_NET_DMA
1000 skb_queue_head_init(&newsk->sk_async_wait_queue);
1001#endif
87d11ceb
ACM		 1002
1003 rwlock_init(&newsk->sk_dst_lock);
1004 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1005 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1006 af_callback_keys + newsk->sk_family,
1007 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1008
1009 newsk->sk_dst_cache = NULL;
1010 newsk->sk_wmem_queued = 0;
1011 newsk->sk_forward_alloc = 0;
1012 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1013 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1014
1015 sock_reset_flag(newsk, SOCK_DONE);
1016 skb_queue_head_init(&newsk->sk_error_queue);
1017
1018 filter = newsk->sk_filter;
1019 if (filter != NULL)
1020 sk_filter_charge(newsk, filter);
1021
1022 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1023 /* It is still raw copy of parent, so invalidate
1024 * destructor and make plain sk_free() */
1025 newsk->sk_destruct = NULL;
1026 sk_free(newsk);
1027 newsk = NULL;
1028 goto out;
1029 }
1030
1031 newsk->sk_err = 0;
1032 newsk->sk_priority = 0;
1033 atomic_set(&newsk->sk_refcnt, 2);
1034
1035 /*
1036 * Increment the counter in the same struct proto as the master
1037 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1038 * is the same as sk->sk_prot->socks, as this field was copied
1039 * with memcpy).
1040 *
1041 * This _changes_ the previous behaviour, where
1042 * tcp_create_openreq_child always was incrementing the
1043 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1044 * to be taken into account in all callers. -acme
1045 */
1046 sk_refcnt_debug_inc(newsk);
1047 newsk->sk_socket = NULL;
1048 newsk->sk_sleep = NULL;
1049
1050 if (newsk->sk_prot->sockets_allocated)
1051 atomic_inc(newsk->sk_prot->sockets_allocated);
1052 }
1053out:
1054 return newsk;
1055}
1056
1057EXPORT_SYMBOL_GPL(sk_clone);
1058
9958089a
AK		 1059void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1060{
1061 __sk_dst_set(sk, dst);
1062 sk->sk_route_caps = dst->dev->features;
1063 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1064 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
9958089a
AK		 1065 if (sk_can_gso(sk)) {
1066 if (dst->header_len)
1067 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1068 else
1069 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1070 }
1071}
1072EXPORT_SYMBOL_GPL(sk_setup_caps);
1073
1da177e4
LT		 1074void __init sk_init(void)
1075{
1076 if (num_physpages <= 4096) {
1077 sysctl_wmem_max = 32767;
1078 sysctl_rmem_max = 32767;
1079 sysctl_wmem_default = 32767;
1080 sysctl_rmem_default = 32767;
1081 } else if (num_physpages >= 131072) {
1082 sysctl_wmem_max = 131071;
1083 sysctl_rmem_max = 131071;
1084 }
1085}
1086
1087/*
1088 * Simple resource managers for sockets.
1089 */
1090
1091
4ec93edb
YH		 1092/*
1093 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1094 */
1095void sock_wfree(struct sk_buff *skb)
1096{
1097 struct sock *sk = skb->sk;
1098
1099 /* In case it might be waiting for more memory. */
1100 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1101 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1102 sk->sk_write_space(sk);
1103 sock_put(sk);
1104}
1105
4ec93edb
YH		 1106/*
1107 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1108 */
1109void sock_rfree(struct sk_buff *skb)
1110{
1111 struct sock *sk = skb->sk;
1112
1113 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1114}
1115
1116
1117int sock_i_uid(struct sock *sk)
1118{
1119 int uid;
1120
1121 read_lock(&sk->sk_callback_lock);
1122 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1123 read_unlock(&sk->sk_callback_lock);
1124 return uid;
1125}
1126
1127unsigned long sock_i_ino(struct sock *sk)
1128{
1129 unsigned long ino;
1130
1131 read_lock(&sk->sk_callback_lock);
1132 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1133 read_unlock(&sk->sk_callback_lock);
1134 return ino;
1135}
1136
1137/*
1138 * Allocate a skb from the socket's send buffer.
1139 */
86a76caf 1140struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1141 gfp_t priority)
1da177e4
LT		 1142{
1143 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1144 struct sk_buff * skb = alloc_skb(size, priority);
1145 if (skb) {
1146 skb_set_owner_w(skb, sk);
1147 return skb;
1148 }
1149 }
1150 return NULL;
1151}
1152
1153/*
1154 * Allocate a skb from the socket's receive buffer.
4ec93edb 1155 */
86a76caf 1156struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1157 gfp_t priority)
1da177e4
LT		 1158{
1159 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1160 struct sk_buff *skb = alloc_skb(size, priority);
1161 if (skb) {
1162 skb_set_owner_r(skb, sk);
1163 return skb;
1164 }
1165 }
1166 return NULL;
1167}
1168
4ec93edb 1169/*
1da177e4 1170 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1171 */
dd0fc66f 1172void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1173{
1174 if ((unsigned)size <= sysctl_optmem_max &&
1175 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1176 void *mem;
1177 /* First do the add, to avoid the race if kmalloc
4ec93edb 1178 * might sleep.
1da177e4
LT		 1179 */
1180 atomic_add(size, &sk->sk_omem_alloc);
1181 mem = kmalloc(size, priority);
1182 if (mem)
1183 return mem;
1184 atomic_sub(size, &sk->sk_omem_alloc);
1185 }
1186 return NULL;
1187}
1188
1189/*
1190 * Free an option memory block.
1191 */
1192void sock_kfree_s(struct sock *sk, void *mem, int size)
1193{
1194 kfree(mem);
1195 atomic_sub(size, &sk->sk_omem_alloc);
1196}
1197
1198/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1199 I think, these locks should be removed for datagram sockets.
1200 */
1201static long sock_wait_for_wmem(struct sock * sk, long timeo)
1202{
1203 DEFINE_WAIT(wait);
1204
1205 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1206 for (;;) {
1207 if (!timeo)
1208 break;
1209 if (signal_pending(current))
1210 break;
1211 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1212 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1213 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1214 break;
1215 if (sk->sk_shutdown & SEND_SHUTDOWN)
1216 break;
1217 if (sk->sk_err)
1218 break;
1219 timeo = schedule_timeout(timeo);
1220 }
1221 finish_wait(sk->sk_sleep, &wait);
1222 return timeo;
1223}
1224
1225
1226/*
1227 * Generic send/receive buffer handlers
1228 */
1229
1230static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1231 unsigned long header_len,
1232 unsigned long data_len,
1233 int noblock, int *errcode)
1234{
1235 struct sk_buff *skb;
7d877f3b 1236 gfp_t gfp_mask;
1da177e4
LT		 1237 long timeo;
1238 int err;
1239
1240 gfp_mask = sk->sk_allocation;
1241 if (gfp_mask & __GFP_WAIT)
1242 gfp_mask |= __GFP_REPEAT;
1243
1244 timeo = sock_sndtimeo(sk, noblock);
1245 while (1) {
1246 err = sock_error(sk);
1247 if (err != 0)
1248 goto failure;
1249
1250 err = -EPIPE;
1251 if (sk->sk_shutdown & SEND_SHUTDOWN)
1252 goto failure;
1253
1254 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1255 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1256 if (skb) {
1257 int npages;
1258 int i;
1259
1260 /* No pages, we're done... */
1261 if (!data_len)
1262 break;
1263
1264 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1265 skb->truesize += data_len;
1266 skb_shinfo(skb)->nr_frags = npages;
1267 for (i = 0; i < npages; i++) {
1268 struct page *page;
1269 skb_frag_t *frag;
1270
1271 page = alloc_pages(sk->sk_allocation, 0);
1272 if (!page) {
1273 err = -ENOBUFS;
1274 skb_shinfo(skb)->nr_frags = i;
1275 kfree_skb(skb);
1276 goto failure;
1277 }
1278
1279 frag = &skb_shinfo(skb)->frags[i];
1280 frag->page = page;
1281 frag->page_offset = 0;
1282 frag->size = (data_len >= PAGE_SIZE ?
1283 PAGE_SIZE :
1284 data_len);
1285 data_len -= PAGE_SIZE;
1286 }
1287
1288 /* Full success... */
1289 break;
1290 }
1291 err = -ENOBUFS;
1292 goto failure;
1293 }
1294 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1295 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1296 err = -EAGAIN;
1297 if (!timeo)
1298 goto failure;
1299 if (signal_pending(current))
1300 goto interrupted;
1301 timeo = sock_wait_for_wmem(sk, timeo);
1302 }
1303
1304 skb_set_owner_w(skb, sk);
1305 return skb;
1306
1307interrupted:
1308 err = sock_intr_errno(timeo);
1309failure:
1310 *errcode = err;
1311 return NULL;
1312}
1313
4ec93edb 1314struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1315 int noblock, int *errcode)
1316{
1317 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1318}
1319
1320static void __lock_sock(struct sock *sk)
1321{
1322 DEFINE_WAIT(wait);
1323
e71a4783 1324 for (;;) {
1da177e4
LT		 1325 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1326 TASK_UNINTERRUPTIBLE);
1327 spin_unlock_bh(&sk->sk_lock.slock);
1328 schedule();
1329 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1330 if (!sock_owned_by_user(sk))
1da177e4
LT		 1331 break;
1332 }
1333 finish_wait(&sk->sk_lock.wq, &wait);
1334}
1335
1336static void __release_sock(struct sock *sk)
1337{
1338 struct sk_buff *skb = sk->sk_backlog.head;
1339
1340 do {
1341 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1342 bh_unlock_sock(sk);
1343
1344 do {
1345 struct sk_buff *next = skb->next;
1346
1347 skb->next = NULL;
1348 sk->sk_backlog_rcv(sk, skb);
1349
1350 /*
1351 * We are in process context here with softirqs
1352 * disabled, use cond_resched_softirq() to preempt.
1353 * This is safe to do because we've taken the backlog
1354 * queue private:
1355 */
1356 cond_resched_softirq();
1357
1358 skb = next;
1359 } while (skb != NULL);
1360
1361 bh_lock_sock(sk);
e71a4783 1362 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1363}
1364
1365/**
1366 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1367 * @sk: sock to wait on
1368 * @timeo: for how long
1da177e4
LT		 1369 *
1370 * Now socket state including sk->sk_err is changed only under lock,
1371 * hence we may omit checks after joining wait queue.
1372 * We check receive queue before schedule() only as optimization;
1373 * it is very likely that release_sock() added new data.
1374 */
1375int sk_wait_data(struct sock *sk, long *timeo)
1376{
1377 int rc;
1378 DEFINE_WAIT(wait);
1379
1380 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1381 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1382 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1383 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1384 finish_wait(sk->sk_sleep, &wait);
1385 return rc;
1386}
1387
1388EXPORT_SYMBOL(sk_wait_data);
1389
1390/*
1391 * Set of default routines for initialising struct proto_ops when
1392 * the protocol does not support a particular function. In certain
1393 * cases where it makes no sense for a protocol to have a "do nothing"
1394 * function, some default processing is provided.
1395 */
1396
1397int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1398{
1399 return -EOPNOTSUPP;
1400}
1401
4ec93edb 1402int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1403 int len, int flags)
1404{
1405 return -EOPNOTSUPP;
1406}
1407
1408int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1409{
1410 return -EOPNOTSUPP;
1411}
1412
1413int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1414{
1415 return -EOPNOTSUPP;
1416}
1417
4ec93edb 1418int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1419 int *len, int peer)
1420{
1421 return -EOPNOTSUPP;
1422}
1423
1424unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1425{
1426 return 0;
1427}
1428
1429int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1430{
1431 return -EOPNOTSUPP;
1432}
1433
1434int sock_no_listen(struct socket *sock, int backlog)
1435{
1436 return -EOPNOTSUPP;
1437}
1438
1439int sock_no_shutdown(struct socket *sock, int how)
1440{
1441 return -EOPNOTSUPP;
1442}
1443
1444int sock_no_setsockopt(struct socket *sock, int level, int optname,
1445 char __user *optval, int optlen)
1446{
1447 return -EOPNOTSUPP;
1448}
1449
1450int sock_no_getsockopt(struct socket *sock, int level, int optname,
1451 char __user *optval, int __user *optlen)
1452{
1453 return -EOPNOTSUPP;
1454}
1455
1456int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1457 size_t len)
1458{
1459 return -EOPNOTSUPP;
1460}
1461
1462int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1463 size_t len, int flags)
1464{
1465 return -EOPNOTSUPP;
1466}
1467
1468int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1469{
1470 /* Mirror missing mmap method error code */
1471 return -ENODEV;
1472}
1473
1474ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1475{
1476 ssize_t res;
1477 struct msghdr msg = {.msg_flags = flags};
1478 struct kvec iov;
1479 char *kaddr = kmap(page);
1480 iov.iov_base = kaddr + offset;
1481 iov.iov_len = size;
1482 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1483 kunmap(page);
1484 return res;
1485}
1486
1487/*
1488 * Default Socket Callbacks
1489 */
1490
1491static void sock_def_wakeup(struct sock *sk)
1492{
1493 read_lock(&sk->sk_callback_lock);
1494 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1495 wake_up_interruptible_all(sk->sk_sleep);
1496 read_unlock(&sk->sk_callback_lock);
1497}
1498
1499static void sock_def_error_report(struct sock *sk)
1500{
1501 read_lock(&sk->sk_callback_lock);
1502 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1503 wake_up_interruptible(sk->sk_sleep);
4ec93edb 1504 sk_wake_async(sk,0,POLL_ERR);
1da177e4
LT		 1505 read_unlock(&sk->sk_callback_lock);
1506}
1507
1508static void sock_def_readable(struct sock *sk, int len)
1509{
1510 read_lock(&sk->sk_callback_lock);
1511 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1512 wake_up_interruptible(sk->sk_sleep);
1513 sk_wake_async(sk,1,POLL_IN);
1514 read_unlock(&sk->sk_callback_lock);
1515}
1516
1517static void sock_def_write_space(struct sock *sk)
1518{
1519 read_lock(&sk->sk_callback_lock);
1520
1521 /* Do not wake up a writer until he can make "significant"
1522 * progress. --DaveM
1523 */
e71a4783 1524 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1da177e4
LT		 1525 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1526 wake_up_interruptible(sk->sk_sleep);
1527
1528 /* Should agree with poll, otherwise some programs break */
1529 if (sock_writeable(sk))
1530 sk_wake_async(sk, 2, POLL_OUT);
1531 }
1532
1533 read_unlock(&sk->sk_callback_lock);
1534}
1535
1536static void sock_def_destruct(struct sock *sk)
1537{
a51482bd 1538 kfree(sk->sk_protinfo);
1da177e4
LT		 1539}
1540
1541void sk_send_sigurg(struct sock *sk)
1542{
1543 if (sk->sk_socket && sk->sk_socket->file)
1544 if (send_sigurg(&sk->sk_socket->file->f_owner))
1545 sk_wake_async(sk, 3, POLL_PRI);
1546}
1547
1548void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1549 unsigned long expires)
1550{
1551 if (!mod_timer(timer, expires))
1552 sock_hold(sk);
1553}
1554
1555EXPORT_SYMBOL(sk_reset_timer);
1556
1557void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1558{
1559 if (timer_pending(timer) && del_timer(timer))
1560 __sock_put(sk);
1561}
1562
1563EXPORT_SYMBOL(sk_stop_timer);
1564
1565void sock_init_data(struct socket *sock, struct sock *sk)
1566{
1567 skb_queue_head_init(&sk->sk_receive_queue);
1568 skb_queue_head_init(&sk->sk_write_queue);
1569 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1570#ifdef CONFIG_NET_DMA
1571 skb_queue_head_init(&sk->sk_async_wait_queue);
1572#endif
1da177e4
LT		 1573
1574 sk->sk_send_head = NULL;
1575
1576 init_timer(&sk->sk_timer);
4ec93edb 1577
1da177e4
LT		 1578 sk->sk_allocation = GFP_KERNEL;
1579 sk->sk_rcvbuf = sysctl_rmem_default;
1580 sk->sk_sndbuf = sysctl_wmem_default;
1581 sk->sk_state = TCP_CLOSE;
1582 sk->sk_socket = sock;
1583
1584 sock_set_flag(sk, SOCK_ZAPPED);
1585
e71a4783 1586 if (sock) {
1da177e4
LT		 1587 sk->sk_type = sock->type;
1588 sk->sk_sleep = &sock->wait;
1589 sock->sk = sk;
1590 } else
1591 sk->sk_sleep = NULL;
1592
1593 rwlock_init(&sk->sk_dst_lock);
1594 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1595 lockdep_set_class_and_name(&sk->sk_callback_lock,
1596 af_callback_keys + sk->sk_family,
1597 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1598
1599 sk->sk_state_change = sock_def_wakeup;
1600 sk->sk_data_ready = sock_def_readable;
1601 sk->sk_write_space = sock_def_write_space;
1602 sk->sk_error_report = sock_def_error_report;
1603 sk->sk_destruct = sock_def_destruct;
1604
1605 sk->sk_sndmsg_page = NULL;
1606 sk->sk_sndmsg_off = 0;
1607
1608 sk->sk_peercred.pid = 0;
1609 sk->sk_peercred.uid = -1;
1610 sk->sk_peercred.gid = -1;
1611 sk->sk_write_pending = 0;
1612 sk->sk_rcvlowat = 1;
1613 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1614 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1615
b7aa0bf7 1616 sk->sk_stamp = ktime_set(-1L, -1L);
1da177e4
LT		 1617
1618 atomic_set(&sk->sk_refcnt, 1);
1619}
1620
fcc70d5f 1621void fastcall lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1622{
1623 might_sleep();
a5b5bb9a 1624 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1625 if (sk->sk_lock.owned)
1da177e4 1626 __lock_sock(sk);
d2e9117c 1627 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1628 spin_unlock(&sk->sk_lock.slock);
1629 /*
1630 * The sk_lock has mutex_lock() semantics here:
1631 */
fcc70d5f 1632 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1633 local_bh_enable();
1da177e4
LT		 1634}
1635
fcc70d5f 1636EXPORT_SYMBOL(lock_sock_nested);
1da177e4
LT		 1637
1638void fastcall release_sock(struct sock *sk)
1639{
a5b5bb9a
IM		 1640 /*
1641 * The sk_lock has mutex_unlock() semantics:
1642 */
1643 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1644
1645 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1646 if (sk->sk_backlog.tail)
1647 __release_sock(sk);
d2e9117c 1648 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1649 if (waitqueue_active(&sk->sk_lock.wq))
1650 wake_up(&sk->sk_lock.wq);
1651 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1652}
1653EXPORT_SYMBOL(release_sock);
1654
1655int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1656{
b7aa0bf7 1657 struct timeval tv;
1da177e4
LT		 1658 if (!sock_flag(sk, SOCK_TIMESTAMP))
1659 sock_enable_timestamp(sk);
b7aa0bf7
ED		 1660 tv = ktime_to_timeval(sk->sk_stamp);
1661 if (tv.tv_sec == -1)
1da177e4 1662 return -ENOENT;
b7aa0bf7
ED		 1663 if (tv.tv_sec == 0) {
1664 sk->sk_stamp = ktime_get_real();
1665 tv = ktime_to_timeval(sk->sk_stamp);
1666 }
1667 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1668}
1da177e4
LT		 1669EXPORT_SYMBOL(sock_get_timestamp);
1670
ae40eb1e
ED		 1671int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1672{
1673 struct timespec ts;
1674 if (!sock_flag(sk, SOCK_TIMESTAMP))
1675 sock_enable_timestamp(sk);
1676 ts = ktime_to_timespec(sk->sk_stamp);
1677 if (ts.tv_sec == -1)
1678 return -ENOENT;
1679 if (ts.tv_sec == 0) {
1680 sk->sk_stamp = ktime_get_real();
1681 ts = ktime_to_timespec(sk->sk_stamp);
1682 }
1683 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1684}
1685EXPORT_SYMBOL(sock_get_timestampns);
1686
1da177e4 1687void sock_enable_timestamp(struct sock *sk)
4ec93edb
YH		 1688{
1689 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 1690 sock_set_flag(sk, SOCK_TIMESTAMP);
1691 net_enable_timestamp();
1692 }
1693}
1da177e4
LT		 1694
1695/*
1696 * Get a socket option on an socket.
1697 *
1698 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1699 * asynchronous errors should be reported by getsockopt. We assume
1700 * this means if you specify SO_ERROR (otherwise whats the point of it).
1701 */
1702int sock_common_getsockopt(struct socket *sock, int level, int optname,
1703 char __user *optval, int __user *optlen)
1704{
1705 struct sock *sk = sock->sk;
1706
1707 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1708}
1709
1710EXPORT_SYMBOL(sock_common_getsockopt);
1711
3fdadf7d 1712#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1713int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1714 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1715{
1716 struct sock *sk = sock->sk;
1717
1e51f951 1718 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 1719 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1720 optval, optlen);
3fdadf7d
DM		 1721 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1722}
1723EXPORT_SYMBOL(compat_sock_common_getsockopt);
1724#endif
1725
1da177e4
LT		 1726int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1727 struct msghdr *msg, size_t size, int flags)
1728{
1729 struct sock *sk = sock->sk;
1730 int addr_len = 0;
1731 int err;
1732
1733 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1734 flags & ~MSG_DONTWAIT, &addr_len);
1735 if (err >= 0)
1736 msg->msg_namelen = addr_len;
1737 return err;
1738}
1739
1740EXPORT_SYMBOL(sock_common_recvmsg);
1741
1742/*
1743 * Set socket options on an inet socket.
1744 */
1745int sock_common_setsockopt(struct socket *sock, int level, int optname,
1746 char __user *optval, int optlen)
1747{
1748 struct sock *sk = sock->sk;
1749
1750 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1751}
1752
1753EXPORT_SYMBOL(sock_common_setsockopt);
1754
3fdadf7d 1755#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1756int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1757 char __user *optval, int optlen)
3fdadf7d
DM		 1758{
1759 struct sock *sk = sock->sk;
1760
543d9cfe
ACM		 1761 if (sk->sk_prot->compat_setsockopt != NULL)
1762 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1763 optval, optlen);
3fdadf7d
DM		 1764 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1765}
1766EXPORT_SYMBOL(compat_sock_common_setsockopt);
1767#endif
1768
1da177e4
LT		 1769void sk_common_release(struct sock *sk)
1770{
1771 if (sk->sk_prot->destroy)
1772 sk->sk_prot->destroy(sk);
1773
1774 /*
1775 * Observation: when sock_common_release is called, processes have
1776 * no access to socket. But net still has.
1777 * Step one, detach it from networking:
1778 *
1779 * A. Remove from hash tables.
1780 */
1781
1782 sk->sk_prot->unhash(sk);
1783
1784 /*
1785 * In this point socket cannot receive new packets, but it is possible
1786 * that some packets are in flight because some CPU runs receiver and
1787 * did hash table lookup before we unhashed socket. They will achieve
1788 * receive queue and will be purged by socket destructor.
1789 *
1790 * Also we still have packets pending on receive queue and probably,
1791 * our own packets waiting in device queues. sock_destroy will drain
1792 * receive queue, but transmitted packets will delay socket destruction
1793 * until the last reference will be released.
1794 */
1795
1796 sock_orphan(sk);
1797
1798 xfrm_sk_free_policy(sk);
1799
e6848976 1800 sk_refcnt_debug_release(sk);
1da177e4
LT		 1801 sock_put(sk);
1802}
1803
1804EXPORT_SYMBOL(sk_common_release);
1805
1806static DEFINE_RWLOCK(proto_list_lock);
1807static LIST_HEAD(proto_list);
1808
1809int proto_register(struct proto *prot, int alloc_slab)
1810{
8feaf0c0
ACM		 1811 char *request_sock_slab_name = NULL;
1812 char *timewait_sock_slab_name;
1da177e4
LT		 1813 int rc = -ENOBUFS;
1814
1da177e4
LT		 1815 if (alloc_slab) {
1816 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
20c2df83 1817 SLAB_HWCACHE_ALIGN, NULL);
1da177e4
LT		 1818
1819 if (prot->slab == NULL) {
1820 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
1821 prot->name);
2a278051 1822 goto out;
1da177e4 1823 }
2e6599cb
ACM		 1824
1825 if (prot->rsk_prot != NULL) {
1826 static const char mask[] = "request_sock_%s";
1827
1828 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1829 if (request_sock_slab_name == NULL)
1830 goto out_free_sock_slab;
1831
1832 sprintf(request_sock_slab_name, mask, prot->name);
1833 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
1834 prot->rsk_prot->obj_size, 0,
20c2df83 1835 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 1836
1837 if (prot->rsk_prot->slab == NULL) {
1838 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
1839 prot->name);
1840 goto out_free_request_sock_slab_name;
1841 }
1842 }
8feaf0c0 1843
6d6ee43e 1844 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 1845 static const char mask[] = "tw_sock_%s";
1846
1847 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1848
1849 if (timewait_sock_slab_name == NULL)
1850 goto out_free_request_sock_slab;
1851
1852 sprintf(timewait_sock_slab_name, mask, prot->name);
6d6ee43e
ACM		 1853 prot->twsk_prot->twsk_slab =
1854 kmem_cache_create(timewait_sock_slab_name,
1855 prot->twsk_prot->twsk_obj_size,
1856 0, SLAB_HWCACHE_ALIGN,
20c2df83 1857 NULL);
6d6ee43e 1858 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 1859 goto out_free_timewait_sock_slab_name;
1860 }
1da177e4
LT		 1861 }
1862
2a278051 1863 write_lock(&proto_list_lock);
1da177e4 1864 list_add(&prot->node, &proto_list);
1da177e4 1865 write_unlock(&proto_list_lock);
2a278051
ACM		 1866 rc = 0;
1867out:
1da177e4 1868 return rc;
8feaf0c0
ACM		 1869out_free_timewait_sock_slab_name:
1870 kfree(timewait_sock_slab_name);
1871out_free_request_sock_slab:
1872 if (prot->rsk_prot && prot->rsk_prot->slab) {
1873 kmem_cache_destroy(prot->rsk_prot->slab);
1874 prot->rsk_prot->slab = NULL;
1875 }
2e6599cb
ACM		 1876out_free_request_sock_slab_name:
1877 kfree(request_sock_slab_name);
1878out_free_sock_slab:
1879 kmem_cache_destroy(prot->slab);
1880 prot->slab = NULL;
1881 goto out;
1da177e4
LT		 1882}
1883
1884EXPORT_SYMBOL(proto_register);
1885
1886void proto_unregister(struct proto *prot)
1887{
1888 write_lock(&proto_list_lock);
0a3f4358
PM		 1889 list_del(&prot->node);
1890 write_unlock(&proto_list_lock);
1da177e4
LT		 1891
1892 if (prot->slab != NULL) {
1893 kmem_cache_destroy(prot->slab);
1894 prot->slab = NULL;
1895 }
1896
2e6599cb
ACM		 1897 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
1898 const char *name = kmem_cache_name(prot->rsk_prot->slab);
1899
1900 kmem_cache_destroy(prot->rsk_prot->slab);
1901 kfree(name);
1902 prot->rsk_prot->slab = NULL;
1903 }
1904
6d6ee43e
ACM		 1905 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
1906 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
8feaf0c0 1907
6d6ee43e 1908 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
8feaf0c0 1909 kfree(name);
6d6ee43e 1910 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 1911 }
1da177e4
LT		 1912}
1913
1914EXPORT_SYMBOL(proto_unregister);
1915
1916#ifdef CONFIG_PROC_FS
1da177e4
LT		 1917static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
1918{
1919 read_lock(&proto_list_lock);
60f0438a 1920 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 1921}
1922
1923static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1924{
60f0438a 1925 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 1926}
1927
1928static void proto_seq_stop(struct seq_file *seq, void *v)
1929{
1930 read_unlock(&proto_list_lock);
1931}
1932
1933static char proto_method_implemented(const void *method)
1934{
1935 return method == NULL ? 'n' : 'y';
1936}
1937
1938static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
1939{
1940 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
1941 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
1942 proto->name,
1943 proto->obj_size,
1944 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
1945 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
1946 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
1947 proto->max_header,
1948 proto->slab == NULL ? "no" : "yes",
1949 module_name(proto->owner),
1950 proto_method_implemented(proto->close),
1951 proto_method_implemented(proto->connect),
1952 proto_method_implemented(proto->disconnect),
1953 proto_method_implemented(proto->accept),
1954 proto_method_implemented(proto->ioctl),
1955 proto_method_implemented(proto->init),
1956 proto_method_implemented(proto->destroy),
1957 proto_method_implemented(proto->shutdown),
1958 proto_method_implemented(proto->setsockopt),
1959 proto_method_implemented(proto->getsockopt),
1960 proto_method_implemented(proto->sendmsg),
1961 proto_method_implemented(proto->recvmsg),
1962 proto_method_implemented(proto->sendpage),
1963 proto_method_implemented(proto->bind),
1964 proto_method_implemented(proto->backlog_rcv),
1965 proto_method_implemented(proto->hash),
1966 proto_method_implemented(proto->unhash),
1967 proto_method_implemented(proto->get_port),
1968 proto_method_implemented(proto->enter_memory_pressure));
1969}
1970
1971static int proto_seq_show(struct seq_file *seq, void *v)
1972{
60f0438a 1973 if (v == &proto_list)
1da177e4
LT		 1974 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
1975 "protocol",
1976 "size",
1977 "sockets",
1978 "memory",
1979 "press",
1980 "maxhdr",
1981 "slab",
1982 "module",
1983 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
1984 else
60f0438a 1985 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 1986 return 0;
1987}
1988
f690808e 1989static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 1990 .start = proto_seq_start,
1991 .next = proto_seq_next,
1992 .stop = proto_seq_stop,
1993 .show = proto_seq_show,
1994};
1995
1996static int proto_seq_open(struct inode *inode, struct file *file)
1997{
1998 return seq_open(file, &proto_seq_ops);
1999}
2000
9a32144e 2001static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2002 .owner = THIS_MODULE,
2003 .open = proto_seq_open,
2004 .read = seq_read,
2005 .llseek = seq_lseek,
2006 .release = seq_release,
2007};
2008
2009static int __init proto_init(void)
2010{
2011 /* register /proc/net/protocols */
457c4cbc 2012 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
1da177e4
LT		 2013}
2014
2015subsys_initcall(proto_init);
2016
2017#endif /* PROC_FS */
2018
2019EXPORT_SYMBOL(sk_alloc);
2020EXPORT_SYMBOL(sk_free);
2021EXPORT_SYMBOL(sk_send_sigurg);
2022EXPORT_SYMBOL(sock_alloc_send_skb);
2023EXPORT_SYMBOL(sock_init_data);
2024EXPORT_SYMBOL(sock_kfree_s);
2025EXPORT_SYMBOL(sock_kmalloc);
2026EXPORT_SYMBOL(sock_no_accept);
2027EXPORT_SYMBOL(sock_no_bind);
2028EXPORT_SYMBOL(sock_no_connect);
2029EXPORT_SYMBOL(sock_no_getname);
2030EXPORT_SYMBOL(sock_no_getsockopt);
2031EXPORT_SYMBOL(sock_no_ioctl);
2032EXPORT_SYMBOL(sock_no_listen);
2033EXPORT_SYMBOL(sock_no_mmap);
2034EXPORT_SYMBOL(sock_no_poll);
2035EXPORT_SYMBOL(sock_no_recvmsg);
2036EXPORT_SYMBOL(sock_no_sendmsg);
2037EXPORT_SYMBOL(sock_no_sendpage);
2038EXPORT_SYMBOL(sock_no_setsockopt);
2039EXPORT_SYMBOL(sock_no_shutdown);
2040EXPORT_SYMBOL(sock_no_socketpair);
2041EXPORT_SYMBOL(sock_rfree);
2042EXPORT_SYMBOL(sock_setsockopt);
2043EXPORT_SYMBOL(sock_wfree);
2044EXPORT_SYMBOL(sock_wmalloc);
2045EXPORT_SYMBOL(sock_i_uid);
2046EXPORT_SYMBOL(sock_i_ino);
1da177e4 2047EXPORT_SYMBOL(sysctl_optmem_max);
6baf1f41 2048#ifdef CONFIG_SYSCTL
1da177e4
LT		 2049EXPORT_SYMBOL(sysctl_rmem_max);
2050EXPORT_SYMBOL(sysctl_wmem_max);
2051#endif
kernel source for telekom puls (alcatel/mediatek)