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Isolate the explicit usage of signal->pgrp
[deliverable/linux.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
10 * Version: $Id: sock.c,v 1.117 2002/02/01 22:01:03 davem Exp $
11 *
02c30a84 12 * Authors: Ross Biro
1da177e4
LT		 13 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
14 * Florian La Roche, <flla@stud.uni-sb.de>
15 * Alan Cox, <A.Cox@swansea.ac.uk>
16 *
17 * Fixes:
18 * Alan Cox : Numerous verify_area() problems
19 * Alan Cox : Connecting on a connecting socket
20 * now returns an error for tcp.
21 * Alan Cox : sock->protocol is set correctly.
22 * and is not sometimes left as 0.
23 * Alan Cox : connect handles icmp errors on a
24 * connect properly. Unfortunately there
25 * is a restart syscall nasty there. I
26 * can't match BSD without hacking the C
27 * library. Ideas urgently sought!
28 * Alan Cox : Disallow bind() to addresses that are
29 * not ours - especially broadcast ones!!
30 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
31 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
32 * instead they leave that for the DESTROY timer.
33 * Alan Cox : Clean up error flag in accept
34 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
35 * was buggy. Put a remove_sock() in the handler
36 * for memory when we hit 0. Also altered the timer
4ec93edb 37 * code. The ACK stuff can wait and needs major
1da177e4
LT		 38 * TCP layer surgery.
39 * Alan Cox : Fixed TCP ack bug, removed remove sock
40 * and fixed timer/inet_bh race.
41 * Alan Cox : Added zapped flag for TCP
42 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
43 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
44 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
45 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
46 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
47 * Rick Sladkey : Relaxed UDP rules for matching packets.
48 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
49 * Pauline Middelink : identd support
50 * Alan Cox : Fixed connect() taking signals I think.
51 * Alan Cox : SO_LINGER supported
52 * Alan Cox : Error reporting fixes
53 * Anonymous : inet_create tidied up (sk->reuse setting)
54 * Alan Cox : inet sockets don't set sk->type!
55 * Alan Cox : Split socket option code
56 * Alan Cox : Callbacks
57 * Alan Cox : Nagle flag for Charles & Johannes stuff
58 * Alex : Removed restriction on inet fioctl
59 * Alan Cox : Splitting INET from NET core
60 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
61 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
62 * Alan Cox : Split IP from generic code
63 * Alan Cox : New kfree_skbmem()
64 * Alan Cox : Make SO_DEBUG superuser only.
65 * Alan Cox : Allow anyone to clear SO_DEBUG
66 * (compatibility fix)
67 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
68 * Alan Cox : Allocator for a socket is settable.
69 * Alan Cox : SO_ERROR includes soft errors.
70 * Alan Cox : Allow NULL arguments on some SO_ opts
71 * Alan Cox : Generic socket allocation to make hooks
72 * easier (suggested by Craig Metz).
73 * Michael Pall : SO_ERROR returns positive errno again
74 * Steve Whitehouse: Added default destructor to free
75 * protocol private data.
76 * Steve Whitehouse: Added various other default routines
77 * common to several socket families.
78 * Chris Evans : Call suser() check last on F_SETOWN
79 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
80 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
81 * Andi Kleen : Fix write_space callback
82 * Chris Evans : Security fixes - signedness again
83 * Arnaldo C. Melo : cleanups, use skb_queue_purge
84 *
85 * To Fix:
86 *
87 *
88 * This program is free software; you can redistribute it and/or
89 * modify it under the terms of the GNU General Public License
90 * as published by the Free Software Foundation; either version
91 * 2 of the License, or (at your option) any later version.
92 */
93
4fc268d2 94#include <linux/capability.h>
1da177e4
LT		 95#include <linux/errno.h>
96#include <linux/types.h>
97#include <linux/socket.h>
98#include <linux/in.h>
99#include <linux/kernel.h>
1da177e4
LT		 100#include <linux/module.h>
101#include <linux/proc_fs.h>
102#include <linux/seq_file.h>
103#include <linux/sched.h>
104#include <linux/timer.h>
105#include <linux/string.h>
106#include <linux/sockios.h>
107#include <linux/net.h>
108#include <linux/mm.h>
109#include <linux/slab.h>
110#include <linux/interrupt.h>
111#include <linux/poll.h>
112#include <linux/tcp.h>
113#include <linux/init.h>
a1f8e7f7 114#include <linux/highmem.h>
1da177e4
LT		 115
116#include <asm/uaccess.h>
117#include <asm/system.h>
118
119#include <linux/netdevice.h>
120#include <net/protocol.h>
121#include <linux/skbuff.h>
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;
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
1da177e4
LT		 860/**
861 * sk_alloc - All socket objects are allocated here
c4ea43c5 862 * @net: the applicable net namespace
4dc3b16b
PP		 863 * @family: protocol family
864 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
865 * @prot: struct proto associated with this new sock instance
866 * @zero_it: if we should zero the newly allocated sock
1da177e4 867 */
1b8d7ae4 868struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
86a76caf 869 struct proto *prot, int zero_it)
1da177e4
LT		 870{
871 struct sock *sk = NULL;
e18b890b 872 struct kmem_cache *slab = prot->slab;
1da177e4
LT		 873
874 if (slab != NULL)
875 sk = kmem_cache_alloc(slab, priority);
876 else
877 sk = kmalloc(prot->obj_size, priority);
878
879 if (sk) {
880 if (zero_it) {
881 memset(sk, 0, prot->obj_size);
882 sk->sk_family = family;
476e19cf
ACM		 883 /*
884 * See comment in struct sock definition to understand
885 * why we need sk_prot_creator -acme
886 */
887 sk->sk_prot = sk->sk_prot_creator = prot;
1da177e4 888 sock_lock_init(sk);
1b8d7ae4 889 sk->sk_net = get_net(net);
1da177e4 890 }
4ec93edb 891
a79af59e
FF		 892 if (security_sk_alloc(sk, family, priority))
893 goto out_free;
894
895 if (!try_module_get(prot->owner))
896 goto out_free;
1da177e4
LT		 897 }
898 return sk;
a79af59e
FF		 899
900out_free:
901 if (slab != NULL)
902 kmem_cache_free(slab, sk);
903 else
904 kfree(sk);
905 return NULL;
1da177e4
LT		 906}
907
908void sk_free(struct sock *sk)
909{
910 struct sk_filter *filter;
476e19cf 911 struct module *owner = sk->sk_prot_creator->owner;
1da177e4
LT		 912
913 if (sk->sk_destruct)
914 sk->sk_destruct(sk);
915
fda9ef5d 916 filter = rcu_dereference(sk->sk_filter);
1da177e4 917 if (filter) {
309dd5fc 918 sk_filter_uncharge(sk, filter);
fda9ef5d 919 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 920 }
921
922 sock_disable_timestamp(sk);
923
924 if (atomic_read(&sk->sk_omem_alloc))
925 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
926 __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
927
928 security_sk_free(sk);
1b8d7ae4 929 put_net(sk->sk_net);
476e19cf
ACM		 930 if (sk->sk_prot_creator->slab != NULL)
931 kmem_cache_free(sk->sk_prot_creator->slab, sk);
1da177e4
LT		 932 else
933 kfree(sk);
934 module_put(owner);
935}
936
dd0fc66f 937struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 938{
1b8d7ae4 939 struct sock *newsk = sk_alloc(sk->sk_net, sk->sk_family, priority, sk->sk_prot, 0);
87d11ceb
ACM		 940
941 if (newsk != NULL) {
942 struct sk_filter *filter;
943
892c141e 944 sock_copy(newsk, sk);
87d11ceb
ACM		 945
946 /* SANITY */
947 sk_node_init(&newsk->sk_node);
948 sock_lock_init(newsk);
949 bh_lock_sock(newsk);
fa438ccf 950 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
87d11ceb
ACM		 951
952 atomic_set(&newsk->sk_rmem_alloc, 0);
953 atomic_set(&newsk->sk_wmem_alloc, 0);
954 atomic_set(&newsk->sk_omem_alloc, 0);
955 skb_queue_head_init(&newsk->sk_receive_queue);
956 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 957#ifdef CONFIG_NET_DMA
958 skb_queue_head_init(&newsk->sk_async_wait_queue);
959#endif
87d11ceb
ACM		 960
961 rwlock_init(&newsk->sk_dst_lock);
962 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 963 lockdep_set_class_and_name(&newsk->sk_callback_lock,
964 af_callback_keys + newsk->sk_family,
965 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 966
967 newsk->sk_dst_cache = NULL;
968 newsk->sk_wmem_queued = 0;
969 newsk->sk_forward_alloc = 0;
970 newsk->sk_send_head = NULL;
87d11ceb
ACM		 971 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
972
973 sock_reset_flag(newsk, SOCK_DONE);
974 skb_queue_head_init(&newsk->sk_error_queue);
975
976 filter = newsk->sk_filter;
977 if (filter != NULL)
978 sk_filter_charge(newsk, filter);
979
980 if (unlikely(xfrm_sk_clone_policy(newsk))) {
981 /* It is still raw copy of parent, so invalidate
982 * destructor and make plain sk_free() */
983 newsk->sk_destruct = NULL;
984 sk_free(newsk);
985 newsk = NULL;
986 goto out;
987 }
988
989 newsk->sk_err = 0;
990 newsk->sk_priority = 0;
991 atomic_set(&newsk->sk_refcnt, 2);
992
993 /*
994 * Increment the counter in the same struct proto as the master
995 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
996 * is the same as sk->sk_prot->socks, as this field was copied
997 * with memcpy).
998 *
999 * This _changes_ the previous behaviour, where
1000 * tcp_create_openreq_child always was incrementing the
1001 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1002 * to be taken into account in all callers. -acme
1003 */
1004 sk_refcnt_debug_inc(newsk);
1005 newsk->sk_socket = NULL;
1006 newsk->sk_sleep = NULL;
1007
1008 if (newsk->sk_prot->sockets_allocated)
1009 atomic_inc(newsk->sk_prot->sockets_allocated);
1010 }
1011out:
1012 return newsk;
1013}
1014
1015EXPORT_SYMBOL_GPL(sk_clone);
1016
9958089a
AK		 1017void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1018{
1019 __sk_dst_set(sk, dst);
1020 sk->sk_route_caps = dst->dev->features;
1021 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1022 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
9958089a
AK		 1023 if (sk_can_gso(sk)) {
1024 if (dst->header_len)
1025 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1026 else
1027 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1028 }
1029}
1030EXPORT_SYMBOL_GPL(sk_setup_caps);
1031
1da177e4
LT		 1032void __init sk_init(void)
1033{
1034 if (num_physpages <= 4096) {
1035 sysctl_wmem_max = 32767;
1036 sysctl_rmem_max = 32767;
1037 sysctl_wmem_default = 32767;
1038 sysctl_rmem_default = 32767;
1039 } else if (num_physpages >= 131072) {
1040 sysctl_wmem_max = 131071;
1041 sysctl_rmem_max = 131071;
1042 }
1043}
1044
1045/*
1046 * Simple resource managers for sockets.
1047 */
1048
1049
4ec93edb
YH		 1050/*
1051 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1052 */
1053void sock_wfree(struct sk_buff *skb)
1054{
1055 struct sock *sk = skb->sk;
1056
1057 /* In case it might be waiting for more memory. */
1058 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1059 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1060 sk->sk_write_space(sk);
1061 sock_put(sk);
1062}
1063
4ec93edb
YH		 1064/*
1065 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1066 */
1067void sock_rfree(struct sk_buff *skb)
1068{
1069 struct sock *sk = skb->sk;
1070
1071 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1072}
1073
1074
1075int sock_i_uid(struct sock *sk)
1076{
1077 int uid;
1078
1079 read_lock(&sk->sk_callback_lock);
1080 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1081 read_unlock(&sk->sk_callback_lock);
1082 return uid;
1083}
1084
1085unsigned long sock_i_ino(struct sock *sk)
1086{
1087 unsigned long ino;
1088
1089 read_lock(&sk->sk_callback_lock);
1090 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1091 read_unlock(&sk->sk_callback_lock);
1092 return ino;
1093}
1094
1095/*
1096 * Allocate a skb from the socket's send buffer.
1097 */
86a76caf 1098struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1099 gfp_t priority)
1da177e4
LT		 1100{
1101 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1102 struct sk_buff * skb = alloc_skb(size, priority);
1103 if (skb) {
1104 skb_set_owner_w(skb, sk);
1105 return skb;
1106 }
1107 }
1108 return NULL;
1109}
1110
1111/*
1112 * Allocate a skb from the socket's receive buffer.
4ec93edb 1113 */
86a76caf 1114struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1115 gfp_t priority)
1da177e4
LT		 1116{
1117 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1118 struct sk_buff *skb = alloc_skb(size, priority);
1119 if (skb) {
1120 skb_set_owner_r(skb, sk);
1121 return skb;
1122 }
1123 }
1124 return NULL;
1125}
1126
4ec93edb 1127/*
1da177e4 1128 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1129 */
dd0fc66f 1130void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1131{
1132 if ((unsigned)size <= sysctl_optmem_max &&
1133 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1134 void *mem;
1135 /* First do the add, to avoid the race if kmalloc
4ec93edb 1136 * might sleep.
1da177e4
LT		 1137 */
1138 atomic_add(size, &sk->sk_omem_alloc);
1139 mem = kmalloc(size, priority);
1140 if (mem)
1141 return mem;
1142 atomic_sub(size, &sk->sk_omem_alloc);
1143 }
1144 return NULL;
1145}
1146
1147/*
1148 * Free an option memory block.
1149 */
1150void sock_kfree_s(struct sock *sk, void *mem, int size)
1151{
1152 kfree(mem);
1153 atomic_sub(size, &sk->sk_omem_alloc);
1154}
1155
1156/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1157 I think, these locks should be removed for datagram sockets.
1158 */
1159static long sock_wait_for_wmem(struct sock * sk, long timeo)
1160{
1161 DEFINE_WAIT(wait);
1162
1163 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1164 for (;;) {
1165 if (!timeo)
1166 break;
1167 if (signal_pending(current))
1168 break;
1169 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1170 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1171 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1172 break;
1173 if (sk->sk_shutdown & SEND_SHUTDOWN)
1174 break;
1175 if (sk->sk_err)
1176 break;
1177 timeo = schedule_timeout(timeo);
1178 }
1179 finish_wait(sk->sk_sleep, &wait);
1180 return timeo;
1181}
1182
1183
1184/*
1185 * Generic send/receive buffer handlers
1186 */
1187
1188static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1189 unsigned long header_len,
1190 unsigned long data_len,
1191 int noblock, int *errcode)
1192{
1193 struct sk_buff *skb;
7d877f3b 1194 gfp_t gfp_mask;
1da177e4
LT		 1195 long timeo;
1196 int err;
1197
1198 gfp_mask = sk->sk_allocation;
1199 if (gfp_mask & __GFP_WAIT)
1200 gfp_mask |= __GFP_REPEAT;
1201
1202 timeo = sock_sndtimeo(sk, noblock);
1203 while (1) {
1204 err = sock_error(sk);
1205 if (err != 0)
1206 goto failure;
1207
1208 err = -EPIPE;
1209 if (sk->sk_shutdown & SEND_SHUTDOWN)
1210 goto failure;
1211
1212 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1213 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1214 if (skb) {
1215 int npages;
1216 int i;
1217
1218 /* No pages, we're done... */
1219 if (!data_len)
1220 break;
1221
1222 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1223 skb->truesize += data_len;
1224 skb_shinfo(skb)->nr_frags = npages;
1225 for (i = 0; i < npages; i++) {
1226 struct page *page;
1227 skb_frag_t *frag;
1228
1229 page = alloc_pages(sk->sk_allocation, 0);
1230 if (!page) {
1231 err = -ENOBUFS;
1232 skb_shinfo(skb)->nr_frags = i;
1233 kfree_skb(skb);
1234 goto failure;
1235 }
1236
1237 frag = &skb_shinfo(skb)->frags[i];
1238 frag->page = page;
1239 frag->page_offset = 0;
1240 frag->size = (data_len >= PAGE_SIZE ?
1241 PAGE_SIZE :
1242 data_len);
1243 data_len -= PAGE_SIZE;
1244 }
1245
1246 /* Full success... */
1247 break;
1248 }
1249 err = -ENOBUFS;
1250 goto failure;
1251 }
1252 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1253 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1254 err = -EAGAIN;
1255 if (!timeo)
1256 goto failure;
1257 if (signal_pending(current))
1258 goto interrupted;
1259 timeo = sock_wait_for_wmem(sk, timeo);
1260 }
1261
1262 skb_set_owner_w(skb, sk);
1263 return skb;
1264
1265interrupted:
1266 err = sock_intr_errno(timeo);
1267failure:
1268 *errcode = err;
1269 return NULL;
1270}
1271
4ec93edb 1272struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1273 int noblock, int *errcode)
1274{
1275 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1276}
1277
1278static void __lock_sock(struct sock *sk)
1279{
1280 DEFINE_WAIT(wait);
1281
e71a4783 1282 for (;;) {
1da177e4
LT		 1283 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1284 TASK_UNINTERRUPTIBLE);
1285 spin_unlock_bh(&sk->sk_lock.slock);
1286 schedule();
1287 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1288 if (!sock_owned_by_user(sk))
1da177e4
LT		 1289 break;
1290 }
1291 finish_wait(&sk->sk_lock.wq, &wait);
1292}
1293
1294static void __release_sock(struct sock *sk)
1295{
1296 struct sk_buff *skb = sk->sk_backlog.head;
1297
1298 do {
1299 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1300 bh_unlock_sock(sk);
1301
1302 do {
1303 struct sk_buff *next = skb->next;
1304
1305 skb->next = NULL;
1306 sk->sk_backlog_rcv(sk, skb);
1307
1308 /*
1309 * We are in process context here with softirqs
1310 * disabled, use cond_resched_softirq() to preempt.
1311 * This is safe to do because we've taken the backlog
1312 * queue private:
1313 */
1314 cond_resched_softirq();
1315
1316 skb = next;
1317 } while (skb != NULL);
1318
1319 bh_lock_sock(sk);
e71a4783 1320 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1321}
1322
1323/**
1324 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1325 * @sk: sock to wait on
1326 * @timeo: for how long
1da177e4
LT		 1327 *
1328 * Now socket state including sk->sk_err is changed only under lock,
1329 * hence we may omit checks after joining wait queue.
1330 * We check receive queue before schedule() only as optimization;
1331 * it is very likely that release_sock() added new data.
1332 */
1333int sk_wait_data(struct sock *sk, long *timeo)
1334{
1335 int rc;
1336 DEFINE_WAIT(wait);
1337
1338 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1339 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1340 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1341 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1342 finish_wait(sk->sk_sleep, &wait);
1343 return rc;
1344}
1345
1346EXPORT_SYMBOL(sk_wait_data);
1347
1348/*
1349 * Set of default routines for initialising struct proto_ops when
1350 * the protocol does not support a particular function. In certain
1351 * cases where it makes no sense for a protocol to have a "do nothing"
1352 * function, some default processing is provided.
1353 */
1354
1355int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1356{
1357 return -EOPNOTSUPP;
1358}
1359
4ec93edb 1360int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1361 int len, int flags)
1362{
1363 return -EOPNOTSUPP;
1364}
1365
1366int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1367{
1368 return -EOPNOTSUPP;
1369}
1370
1371int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1372{
1373 return -EOPNOTSUPP;
1374}
1375
4ec93edb 1376int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1377 int *len, int peer)
1378{
1379 return -EOPNOTSUPP;
1380}
1381
1382unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1383{
1384 return 0;
1385}
1386
1387int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1388{
1389 return -EOPNOTSUPP;
1390}
1391
1392int sock_no_listen(struct socket *sock, int backlog)
1393{
1394 return -EOPNOTSUPP;
1395}
1396
1397int sock_no_shutdown(struct socket *sock, int how)
1398{
1399 return -EOPNOTSUPP;
1400}
1401
1402int sock_no_setsockopt(struct socket *sock, int level, int optname,
1403 char __user *optval, int optlen)
1404{
1405 return -EOPNOTSUPP;
1406}
1407
1408int sock_no_getsockopt(struct socket *sock, int level, int optname,
1409 char __user *optval, int __user *optlen)
1410{
1411 return -EOPNOTSUPP;
1412}
1413
1414int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1415 size_t len)
1416{
1417 return -EOPNOTSUPP;
1418}
1419
1420int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1421 size_t len, int flags)
1422{
1423 return -EOPNOTSUPP;
1424}
1425
1426int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1427{
1428 /* Mirror missing mmap method error code */
1429 return -ENODEV;
1430}
1431
1432ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1433{
1434 ssize_t res;
1435 struct msghdr msg = {.msg_flags = flags};
1436 struct kvec iov;
1437 char *kaddr = kmap(page);
1438 iov.iov_base = kaddr + offset;
1439 iov.iov_len = size;
1440 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1441 kunmap(page);
1442 return res;
1443}
1444
1445/*
1446 * Default Socket Callbacks
1447 */
1448
1449static void sock_def_wakeup(struct sock *sk)
1450{
1451 read_lock(&sk->sk_callback_lock);
1452 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1453 wake_up_interruptible_all(sk->sk_sleep);
1454 read_unlock(&sk->sk_callback_lock);
1455}
1456
1457static void sock_def_error_report(struct sock *sk)
1458{
1459 read_lock(&sk->sk_callback_lock);
1460 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1461 wake_up_interruptible(sk->sk_sleep);
4ec93edb 1462 sk_wake_async(sk,0,POLL_ERR);
1da177e4
LT		 1463 read_unlock(&sk->sk_callback_lock);
1464}
1465
1466static void sock_def_readable(struct sock *sk, int len)
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);
1471 sk_wake_async(sk,1,POLL_IN);
1472 read_unlock(&sk->sk_callback_lock);
1473}
1474
1475static void sock_def_write_space(struct sock *sk)
1476{
1477 read_lock(&sk->sk_callback_lock);
1478
1479 /* Do not wake up a writer until he can make "significant"
1480 * progress. --DaveM
1481 */
e71a4783 1482 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1da177e4
LT		 1483 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1484 wake_up_interruptible(sk->sk_sleep);
1485
1486 /* Should agree with poll, otherwise some programs break */
1487 if (sock_writeable(sk))
1488 sk_wake_async(sk, 2, POLL_OUT);
1489 }
1490
1491 read_unlock(&sk->sk_callback_lock);
1492}
1493
1494static void sock_def_destruct(struct sock *sk)
1495{
a51482bd 1496 kfree(sk->sk_protinfo);
1da177e4
LT		 1497}
1498
1499void sk_send_sigurg(struct sock *sk)
1500{
1501 if (sk->sk_socket && sk->sk_socket->file)
1502 if (send_sigurg(&sk->sk_socket->file->f_owner))
1503 sk_wake_async(sk, 3, POLL_PRI);
1504}
1505
1506void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1507 unsigned long expires)
1508{
1509 if (!mod_timer(timer, expires))
1510 sock_hold(sk);
1511}
1512
1513EXPORT_SYMBOL(sk_reset_timer);
1514
1515void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1516{
1517 if (timer_pending(timer) && del_timer(timer))
1518 __sock_put(sk);
1519}
1520
1521EXPORT_SYMBOL(sk_stop_timer);
1522
1523void sock_init_data(struct socket *sock, struct sock *sk)
1524{
1525 skb_queue_head_init(&sk->sk_receive_queue);
1526 skb_queue_head_init(&sk->sk_write_queue);
1527 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1528#ifdef CONFIG_NET_DMA
1529 skb_queue_head_init(&sk->sk_async_wait_queue);
1530#endif
1da177e4
LT		 1531
1532 sk->sk_send_head = NULL;
1533
1534 init_timer(&sk->sk_timer);
4ec93edb 1535
1da177e4
LT		 1536 sk->sk_allocation = GFP_KERNEL;
1537 sk->sk_rcvbuf = sysctl_rmem_default;
1538 sk->sk_sndbuf = sysctl_wmem_default;
1539 sk->sk_state = TCP_CLOSE;
1540 sk->sk_socket = sock;
1541
1542 sock_set_flag(sk, SOCK_ZAPPED);
1543
e71a4783 1544 if (sock) {
1da177e4
LT		 1545 sk->sk_type = sock->type;
1546 sk->sk_sleep = &sock->wait;
1547 sock->sk = sk;
1548 } else
1549 sk->sk_sleep = NULL;
1550
1551 rwlock_init(&sk->sk_dst_lock);
1552 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1553 lockdep_set_class_and_name(&sk->sk_callback_lock,
1554 af_callback_keys + sk->sk_family,
1555 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1556
1557 sk->sk_state_change = sock_def_wakeup;
1558 sk->sk_data_ready = sock_def_readable;
1559 sk->sk_write_space = sock_def_write_space;
1560 sk->sk_error_report = sock_def_error_report;
1561 sk->sk_destruct = sock_def_destruct;
1562
1563 sk->sk_sndmsg_page = NULL;
1564 sk->sk_sndmsg_off = 0;
1565
1566 sk->sk_peercred.pid = 0;
1567 sk->sk_peercred.uid = -1;
1568 sk->sk_peercred.gid = -1;
1569 sk->sk_write_pending = 0;
1570 sk->sk_rcvlowat = 1;
1571 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1572 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1573
b7aa0bf7 1574 sk->sk_stamp = ktime_set(-1L, -1L);
1da177e4
LT		 1575
1576 atomic_set(&sk->sk_refcnt, 1);
1577}
1578
fcc70d5f 1579void fastcall lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1580{
1581 might_sleep();
a5b5bb9a 1582 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1583 if (sk->sk_lock.owned)
1da177e4 1584 __lock_sock(sk);
d2e9117c 1585 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1586 spin_unlock(&sk->sk_lock.slock);
1587 /*
1588 * The sk_lock has mutex_lock() semantics here:
1589 */
fcc70d5f 1590 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1591 local_bh_enable();
1da177e4
LT		 1592}
1593
fcc70d5f 1594EXPORT_SYMBOL(lock_sock_nested);
1da177e4
LT		 1595
1596void fastcall release_sock(struct sock *sk)
1597{
a5b5bb9a
IM		 1598 /*
1599 * The sk_lock has mutex_unlock() semantics:
1600 */
1601 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1602
1603 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1604 if (sk->sk_backlog.tail)
1605 __release_sock(sk);
d2e9117c 1606 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1607 if (waitqueue_active(&sk->sk_lock.wq))
1608 wake_up(&sk->sk_lock.wq);
1609 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1610}
1611EXPORT_SYMBOL(release_sock);
1612
1613int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1614{
b7aa0bf7 1615 struct timeval tv;
1da177e4
LT		 1616 if (!sock_flag(sk, SOCK_TIMESTAMP))
1617 sock_enable_timestamp(sk);
b7aa0bf7
ED		 1618 tv = ktime_to_timeval(sk->sk_stamp);
1619 if (tv.tv_sec == -1)
1da177e4 1620 return -ENOENT;
b7aa0bf7
ED		 1621 if (tv.tv_sec == 0) {
1622 sk->sk_stamp = ktime_get_real();
1623 tv = ktime_to_timeval(sk->sk_stamp);
1624 }
1625 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1626}
1da177e4
LT		 1627EXPORT_SYMBOL(sock_get_timestamp);
1628
ae40eb1e
ED		 1629int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1630{
1631 struct timespec ts;
1632 if (!sock_flag(sk, SOCK_TIMESTAMP))
1633 sock_enable_timestamp(sk);
1634 ts = ktime_to_timespec(sk->sk_stamp);
1635 if (ts.tv_sec == -1)
1636 return -ENOENT;
1637 if (ts.tv_sec == 0) {
1638 sk->sk_stamp = ktime_get_real();
1639 ts = ktime_to_timespec(sk->sk_stamp);
1640 }
1641 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1642}
1643EXPORT_SYMBOL(sock_get_timestampns);
1644
1da177e4 1645void sock_enable_timestamp(struct sock *sk)
4ec93edb
YH		 1646{
1647 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 1648 sock_set_flag(sk, SOCK_TIMESTAMP);
1649 net_enable_timestamp();
1650 }
1651}
4ec93edb 1652EXPORT_SYMBOL(sock_enable_timestamp);
1da177e4
LT		 1653
1654/*
1655 * Get a socket option on an socket.
1656 *
1657 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1658 * asynchronous errors should be reported by getsockopt. We assume
1659 * this means if you specify SO_ERROR (otherwise whats the point of it).
1660 */
1661int sock_common_getsockopt(struct socket *sock, int level, int optname,
1662 char __user *optval, int __user *optlen)
1663{
1664 struct sock *sk = sock->sk;
1665
1666 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1667}
1668
1669EXPORT_SYMBOL(sock_common_getsockopt);
1670
3fdadf7d 1671#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1672int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1673 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1674{
1675 struct sock *sk = sock->sk;
1676
1e51f951 1677 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 1678 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1679 optval, optlen);
3fdadf7d
DM		 1680 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1681}
1682EXPORT_SYMBOL(compat_sock_common_getsockopt);
1683#endif
1684
1da177e4
LT		 1685int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1686 struct msghdr *msg, size_t size, int flags)
1687{
1688 struct sock *sk = sock->sk;
1689 int addr_len = 0;
1690 int err;
1691
1692 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1693 flags & ~MSG_DONTWAIT, &addr_len);
1694 if (err >= 0)
1695 msg->msg_namelen = addr_len;
1696 return err;
1697}
1698
1699EXPORT_SYMBOL(sock_common_recvmsg);
1700
1701/*
1702 * Set socket options on an inet socket.
1703 */
1704int sock_common_setsockopt(struct socket *sock, int level, int optname,
1705 char __user *optval, int optlen)
1706{
1707 struct sock *sk = sock->sk;
1708
1709 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1710}
1711
1712EXPORT_SYMBOL(sock_common_setsockopt);
1713
3fdadf7d 1714#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1715int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1716 char __user *optval, int optlen)
3fdadf7d
DM		 1717{
1718 struct sock *sk = sock->sk;
1719
543d9cfe
ACM		 1720 if (sk->sk_prot->compat_setsockopt != NULL)
1721 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1722 optval, optlen);
3fdadf7d
DM		 1723 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1724}
1725EXPORT_SYMBOL(compat_sock_common_setsockopt);
1726#endif
1727
1da177e4
LT		 1728void sk_common_release(struct sock *sk)
1729{
1730 if (sk->sk_prot->destroy)
1731 sk->sk_prot->destroy(sk);
1732
1733 /*
1734 * Observation: when sock_common_release is called, processes have
1735 * no access to socket. But net still has.
1736 * Step one, detach it from networking:
1737 *
1738 * A. Remove from hash tables.
1739 */
1740
1741 sk->sk_prot->unhash(sk);
1742
1743 /*
1744 * In this point socket cannot receive new packets, but it is possible
1745 * that some packets are in flight because some CPU runs receiver and
1746 * did hash table lookup before we unhashed socket. They will achieve
1747 * receive queue and will be purged by socket destructor.
1748 *
1749 * Also we still have packets pending on receive queue and probably,
1750 * our own packets waiting in device queues. sock_destroy will drain
1751 * receive queue, but transmitted packets will delay socket destruction
1752 * until the last reference will be released.
1753 */
1754
1755 sock_orphan(sk);
1756
1757 xfrm_sk_free_policy(sk);
1758
e6848976 1759 sk_refcnt_debug_release(sk);
1da177e4
LT		 1760 sock_put(sk);
1761}
1762
1763EXPORT_SYMBOL(sk_common_release);
1764
1765static DEFINE_RWLOCK(proto_list_lock);
1766static LIST_HEAD(proto_list);
1767
1768int proto_register(struct proto *prot, int alloc_slab)
1769{
8feaf0c0
ACM		 1770 char *request_sock_slab_name = NULL;
1771 char *timewait_sock_slab_name;
1da177e4
LT		 1772 int rc = -ENOBUFS;
1773
1da177e4
LT		 1774 if (alloc_slab) {
1775 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
20c2df83 1776 SLAB_HWCACHE_ALIGN, NULL);
1da177e4
LT		 1777
1778 if (prot->slab == NULL) {
1779 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
1780 prot->name);
2a278051 1781 goto out;
1da177e4 1782 }
2e6599cb
ACM		 1783
1784 if (prot->rsk_prot != NULL) {
1785 static const char mask[] = "request_sock_%s";
1786
1787 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1788 if (request_sock_slab_name == NULL)
1789 goto out_free_sock_slab;
1790
1791 sprintf(request_sock_slab_name, mask, prot->name);
1792 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
1793 prot->rsk_prot->obj_size, 0,
20c2df83 1794 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 1795
1796 if (prot->rsk_prot->slab == NULL) {
1797 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
1798 prot->name);
1799 goto out_free_request_sock_slab_name;
1800 }
1801 }
8feaf0c0 1802
6d6ee43e 1803 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 1804 static const char mask[] = "tw_sock_%s";
1805
1806 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1807
1808 if (timewait_sock_slab_name == NULL)
1809 goto out_free_request_sock_slab;
1810
1811 sprintf(timewait_sock_slab_name, mask, prot->name);
6d6ee43e
ACM		 1812 prot->twsk_prot->twsk_slab =
1813 kmem_cache_create(timewait_sock_slab_name,
1814 prot->twsk_prot->twsk_obj_size,
1815 0, SLAB_HWCACHE_ALIGN,
20c2df83 1816 NULL);
6d6ee43e 1817 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 1818 goto out_free_timewait_sock_slab_name;
1819 }
1da177e4
LT		 1820 }
1821
2a278051 1822 write_lock(&proto_list_lock);
1da177e4 1823 list_add(&prot->node, &proto_list);
1da177e4 1824 write_unlock(&proto_list_lock);
2a278051
ACM		 1825 rc = 0;
1826out:
1da177e4 1827 return rc;
8feaf0c0
ACM		 1828out_free_timewait_sock_slab_name:
1829 kfree(timewait_sock_slab_name);
1830out_free_request_sock_slab:
1831 if (prot->rsk_prot && prot->rsk_prot->slab) {
1832 kmem_cache_destroy(prot->rsk_prot->slab);
1833 prot->rsk_prot->slab = NULL;
1834 }
2e6599cb
ACM		 1835out_free_request_sock_slab_name:
1836 kfree(request_sock_slab_name);
1837out_free_sock_slab:
1838 kmem_cache_destroy(prot->slab);
1839 prot->slab = NULL;
1840 goto out;
1da177e4
LT		 1841}
1842
1843EXPORT_SYMBOL(proto_register);
1844
1845void proto_unregister(struct proto *prot)
1846{
1847 write_lock(&proto_list_lock);
0a3f4358
PM		 1848 list_del(&prot->node);
1849 write_unlock(&proto_list_lock);
1da177e4
LT		 1850
1851 if (prot->slab != NULL) {
1852 kmem_cache_destroy(prot->slab);
1853 prot->slab = NULL;
1854 }
1855
2e6599cb
ACM		 1856 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
1857 const char *name = kmem_cache_name(prot->rsk_prot->slab);
1858
1859 kmem_cache_destroy(prot->rsk_prot->slab);
1860 kfree(name);
1861 prot->rsk_prot->slab = NULL;
1862 }
1863
6d6ee43e
ACM		 1864 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
1865 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
8feaf0c0 1866
6d6ee43e 1867 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
8feaf0c0 1868 kfree(name);
6d6ee43e 1869 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 1870 }
1da177e4
LT		 1871}
1872
1873EXPORT_SYMBOL(proto_unregister);
1874
1875#ifdef CONFIG_PROC_FS
1da177e4
LT		 1876static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
1877{
1878 read_lock(&proto_list_lock);
60f0438a 1879 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 1880}
1881
1882static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1883{
60f0438a 1884 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 1885}
1886
1887static void proto_seq_stop(struct seq_file *seq, void *v)
1888{
1889 read_unlock(&proto_list_lock);
1890}
1891
1892static char proto_method_implemented(const void *method)
1893{
1894 return method == NULL ? 'n' : 'y';
1895}
1896
1897static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
1898{
1899 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
1900 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
1901 proto->name,
1902 proto->obj_size,
1903 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
1904 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
1905 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
1906 proto->max_header,
1907 proto->slab == NULL ? "no" : "yes",
1908 module_name(proto->owner),
1909 proto_method_implemented(proto->close),
1910 proto_method_implemented(proto->connect),
1911 proto_method_implemented(proto->disconnect),
1912 proto_method_implemented(proto->accept),
1913 proto_method_implemented(proto->ioctl),
1914 proto_method_implemented(proto->init),
1915 proto_method_implemented(proto->destroy),
1916 proto_method_implemented(proto->shutdown),
1917 proto_method_implemented(proto->setsockopt),
1918 proto_method_implemented(proto->getsockopt),
1919 proto_method_implemented(proto->sendmsg),
1920 proto_method_implemented(proto->recvmsg),
1921 proto_method_implemented(proto->sendpage),
1922 proto_method_implemented(proto->bind),
1923 proto_method_implemented(proto->backlog_rcv),
1924 proto_method_implemented(proto->hash),
1925 proto_method_implemented(proto->unhash),
1926 proto_method_implemented(proto->get_port),
1927 proto_method_implemented(proto->enter_memory_pressure));
1928}
1929
1930static int proto_seq_show(struct seq_file *seq, void *v)
1931{
60f0438a 1932 if (v == &proto_list)
1da177e4
LT		 1933 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
1934 "protocol",
1935 "size",
1936 "sockets",
1937 "memory",
1938 "press",
1939 "maxhdr",
1940 "slab",
1941 "module",
1942 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
1943 else
60f0438a 1944 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 1945 return 0;
1946}
1947
f690808e 1948static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 1949 .start = proto_seq_start,
1950 .next = proto_seq_next,
1951 .stop = proto_seq_stop,
1952 .show = proto_seq_show,
1953};
1954
1955static int proto_seq_open(struct inode *inode, struct file *file)
1956{
1957 return seq_open(file, &proto_seq_ops);
1958}
1959
9a32144e 1960static const struct file_operations proto_seq_fops = {
1da177e4
LT		 1961 .owner = THIS_MODULE,
1962 .open = proto_seq_open,
1963 .read = seq_read,
1964 .llseek = seq_lseek,
1965 .release = seq_release,
1966};
1967
1968static int __init proto_init(void)
1969{
1970 /* register /proc/net/protocols */
457c4cbc 1971 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
1da177e4
LT		 1972}
1973
1974subsys_initcall(proto_init);
1975
1976#endif /* PROC_FS */
1977
1978EXPORT_SYMBOL(sk_alloc);
1979EXPORT_SYMBOL(sk_free);
1980EXPORT_SYMBOL(sk_send_sigurg);
1981EXPORT_SYMBOL(sock_alloc_send_skb);
1982EXPORT_SYMBOL(sock_init_data);
1983EXPORT_SYMBOL(sock_kfree_s);
1984EXPORT_SYMBOL(sock_kmalloc);
1985EXPORT_SYMBOL(sock_no_accept);
1986EXPORT_SYMBOL(sock_no_bind);
1987EXPORT_SYMBOL(sock_no_connect);
1988EXPORT_SYMBOL(sock_no_getname);
1989EXPORT_SYMBOL(sock_no_getsockopt);
1990EXPORT_SYMBOL(sock_no_ioctl);
1991EXPORT_SYMBOL(sock_no_listen);
1992EXPORT_SYMBOL(sock_no_mmap);
1993EXPORT_SYMBOL(sock_no_poll);
1994EXPORT_SYMBOL(sock_no_recvmsg);
1995EXPORT_SYMBOL(sock_no_sendmsg);
1996EXPORT_SYMBOL(sock_no_sendpage);
1997EXPORT_SYMBOL(sock_no_setsockopt);
1998EXPORT_SYMBOL(sock_no_shutdown);
1999EXPORT_SYMBOL(sock_no_socketpair);
2000EXPORT_SYMBOL(sock_rfree);
2001EXPORT_SYMBOL(sock_setsockopt);
2002EXPORT_SYMBOL(sock_wfree);
2003EXPORT_SYMBOL(sock_wmalloc);
2004EXPORT_SYMBOL(sock_i_uid);
2005EXPORT_SYMBOL(sock_i_ino);
1da177e4 2006EXPORT_SYMBOL(sysctl_optmem_max);
6baf1f41 2007#ifdef CONFIG_SYSCTL
1da177e4
LT		 2008EXPORT_SYMBOL(sysctl_rmem_max);
2009EXPORT_SYMBOL(sysctl_wmem_max);
2010#endif
Linux kernel - Deliverables
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