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Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/usb-2.6
[linux-2.6-block.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
10 * Version: $Id: sock.c,v 1.117 2002/02/01 22:01:03 davem Exp $
11 *
02c30a84 12 * Authors: Ross Biro
1da177e4
LT		 13 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
14 * Florian La Roche, <flla@stud.uni-sb.de>
15 * Alan Cox, <A.Cox@swansea.ac.uk>
16 *
17 * Fixes:
18 * Alan Cox : Numerous verify_area() problems
19 * Alan Cox : Connecting on a connecting socket
20 * now returns an error for tcp.
21 * Alan Cox : sock->protocol is set correctly.
22 * and is not sometimes left as 0.
23 * Alan Cox : connect handles icmp errors on a
24 * connect properly. Unfortunately there
25 * is a restart syscall nasty there. I
26 * can't match BSD without hacking the C
27 * library. Ideas urgently sought!
28 * Alan Cox : Disallow bind() to addresses that are
29 * not ours - especially broadcast ones!!
30 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
31 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
32 * instead they leave that for the DESTROY timer.
33 * Alan Cox : Clean up error flag in accept
34 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
35 * was buggy. Put a remove_sock() in the handler
36 * for memory when we hit 0. Also altered the timer
4ec93edb 37 * code. The ACK stuff can wait and needs major
1da177e4
LT		 38 * TCP layer surgery.
39 * Alan Cox : Fixed TCP ack bug, removed remove sock
40 * and fixed timer/inet_bh race.
41 * Alan Cox : Added zapped flag for TCP
42 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
43 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
44 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
45 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
46 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
47 * Rick Sladkey : Relaxed UDP rules for matching packets.
48 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
49 * Pauline Middelink : identd support
50 * Alan Cox : Fixed connect() taking signals I think.
51 * Alan Cox : SO_LINGER supported
52 * Alan Cox : Error reporting fixes
53 * Anonymous : inet_create tidied up (sk->reuse setting)
54 * Alan Cox : inet sockets don't set sk->type!
55 * Alan Cox : Split socket option code
56 * Alan Cox : Callbacks
57 * Alan Cox : Nagle flag for Charles & Johannes stuff
58 * Alex : Removed restriction on inet fioctl
59 * Alan Cox : Splitting INET from NET core
60 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
61 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
62 * Alan Cox : Split IP from generic code
63 * Alan Cox : New kfree_skbmem()
64 * Alan Cox : Make SO_DEBUG superuser only.
65 * Alan Cox : Allow anyone to clear SO_DEBUG
66 * (compatibility fix)
67 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
68 * Alan Cox : Allocator for a socket is settable.
69 * Alan Cox : SO_ERROR includes soft errors.
70 * Alan Cox : Allow NULL arguments on some SO_ opts
71 * Alan Cox : Generic socket allocation to make hooks
72 * easier (suggested by Craig Metz).
73 * Michael Pall : SO_ERROR returns positive errno again
74 * Steve Whitehouse: Added default destructor to free
75 * protocol private data.
76 * Steve Whitehouse: Added various other default routines
77 * common to several socket families.
78 * Chris Evans : Call suser() check last on F_SETOWN
79 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
80 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
81 * Andi Kleen : Fix write_space callback
82 * Chris Evans : Security fixes - signedness again
83 * Arnaldo C. Melo : cleanups, use skb_queue_purge
84 *
85 * To Fix:
86 *
87 *
88 * This program is free software; you can redistribute it and/or
89 * modify it under the terms of the GNU General Public License
90 * as published by the Free Software Foundation; either version
91 * 2 of the License, or (at your option) any later version.
92 */
93
4fc268d2 94#include <linux/capability.h>
1da177e4
LT		 95#include <linux/errno.h>
96#include <linux/types.h>
97#include <linux/socket.h>
98#include <linux/in.h>
99#include <linux/kernel.h>
1da177e4
LT		 100#include <linux/module.h>
101#include <linux/proc_fs.h>
102#include <linux/seq_file.h>
103#include <linux/sched.h>
104#include <linux/timer.h>
105#include <linux/string.h>
106#include <linux/sockios.h>
107#include <linux/net.h>
108#include <linux/mm.h>
109#include <linux/slab.h>
110#include <linux/interrupt.h>
111#include <linux/poll.h>
112#include <linux/tcp.h>
113#include <linux/init.h>
a1f8e7f7 114#include <linux/highmem.h>
1da177e4
LT		 115
116#include <asm/uaccess.h>
117#include <asm/system.h>
118
119#include <linux/netdevice.h>
120#include <net/protocol.h>
121#include <linux/skbuff.h>
2e6599cb 122#include <net/request_sock.h>
1da177e4
LT		 123#include <net/sock.h>
124#include <net/xfrm.h>
125#include <linux/ipsec.h>
126
127#include <linux/filter.h>
128
129#ifdef CONFIG_INET
130#include <net/tcp.h>
131#endif
132
da21f24d
IM		 133/*
134 * Each address family might have different locking rules, so we have
135 * one slock key per address family:
136 */
a5b5bb9a
IM		 137static struct lock_class_key af_family_keys[AF_MAX];
138static struct lock_class_key af_family_slock_keys[AF_MAX];
139
140#ifdef CONFIG_DEBUG_LOCK_ALLOC
141/*
142 * Make lock validator output more readable. (we pre-construct these
143 * strings build-time, so that runtime initialization of socket
144 * locks is fast):
145 */
146static const char *af_family_key_strings[AF_MAX+1] = {
147 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
148 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
149 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
150 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
151 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
152 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
153 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
154 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
155 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
156 "sk_lock-27" , "sk_lock-28" , "sk_lock-29" ,
17926a79
DH		 157 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
158 "sk_lock-AF_RXRPC" , "sk_lock-AF_MAX"
a5b5bb9a
IM		 159};
160static const char *af_family_slock_key_strings[AF_MAX+1] = {
161 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
162 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
163 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
164 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
165 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
166 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
167 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
168 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" ,
169 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
170 "slock-27" , "slock-28" , "slock-29" ,
17926a79
DH		 171 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
172 "slock-AF_RXRPC" , "slock-AF_MAX"
a5b5bb9a 173};
443aef0e
PZ		 174static const char *af_family_clock_key_strings[AF_MAX+1] = {
175 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
176 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
177 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
178 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
179 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
180 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
181 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
182 "clock-21" , "clock-AF_SNA" , "clock-AF_IRDA" ,
183 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
184 "clock-27" , "clock-28" , "clock-29" ,
e51f802b
DH		 185 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
186 "clock-AF_RXRPC" , "clock-AF_MAX"
443aef0e 187};
a5b5bb9a 188#endif
da21f24d
IM		 189
190/*
191 * sk_callback_lock locking rules are per-address-family,
192 * so split the lock classes by using a per-AF key:
193 */
194static struct lock_class_key af_callback_keys[AF_MAX];
195
1da177e4
LT		 196/* Take into consideration the size of the struct sk_buff overhead in the
197 * determination of these values, since that is non-constant across
198 * platforms. This makes socket queueing behavior and performance
199 * not depend upon such differences.
200 */
201#define _SK_MEM_PACKETS 256
202#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
203#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
204#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
205
206/* Run time adjustable parameters. */
ab32ea5d
BH		 207__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
208__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
209__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
210__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4
LT		 211
212/* Maximal space eaten by iovec or ancilliary data plus some space */
ab32ea5d 213int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
1da177e4
LT		 214
215static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
216{
217 struct timeval tv;
218
219 if (optlen < sizeof(tv))
220 return -EINVAL;
221 if (copy_from_user(&tv, optval, sizeof(tv)))
222 return -EFAULT;
ba78073e
VA		 223 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
224 return -EDOM;
1da177e4 225
ba78073e 226 if (tv.tv_sec < 0) {
6f11df83
AM		 227 static int warned __read_mostly;
228
ba78073e
VA		 229 *timeo_p = 0;
230 if (warned < 10 && net_ratelimit())
231 warned++;
232 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
233 "tries to set negative timeout\n",
40b77c94 234 current->comm, current->pid);
ba78073e
VA		 235 return 0;
236 }
1da177e4
LT		 237 *timeo_p = MAX_SCHEDULE_TIMEOUT;
238 if (tv.tv_sec == 0 && tv.tv_usec == 0)
239 return 0;
240 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
241 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
242 return 0;
243}
244
245static void sock_warn_obsolete_bsdism(const char *name)
246{
247 static int warned;
248 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 249 if (strcmp(warncomm, current->comm) && warned < 5) {
250 strcpy(warncomm, current->comm);
1da177e4
LT		 251 printk(KERN_WARNING "process `%s' is using obsolete "
252 "%s SO_BSDCOMPAT\n", warncomm, name);
253 warned++;
254 }
255}
256
257static void sock_disable_timestamp(struct sock *sk)
4ec93edb
YH		 258{
259 if (sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 260 sock_reset_flag(sk, SOCK_TIMESTAMP);
261 net_disable_timestamp();
262 }
263}
264
265
f0088a50
DV		 266int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
267{
268 int err = 0;
269 int skb_len;
270
271 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
272 number of warnings when compiling with -W --ANK
273 */
274 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
275 (unsigned)sk->sk_rcvbuf) {
276 err = -ENOMEM;
277 goto out;
278 }
279
fda9ef5d 280 err = sk_filter(sk, skb);
f0088a50
DV		 281 if (err)
282 goto out;
283
284 skb->dev = NULL;
285 skb_set_owner_r(skb, sk);
286
287 /* Cache the SKB length before we tack it onto the receive
288 * queue. Once it is added it no longer belongs to us and
289 * may be freed by other threads of control pulling packets
290 * from the queue.
291 */
292 skb_len = skb->len;
293
294 skb_queue_tail(&sk->sk_receive_queue, skb);
295
296 if (!sock_flag(sk, SOCK_DEAD))
297 sk->sk_data_ready(sk, skb_len);
298out:
299 return err;
300}
301EXPORT_SYMBOL(sock_queue_rcv_skb);
302
58a5a7b9 303int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 304{
305 int rc = NET_RX_SUCCESS;
306
fda9ef5d 307 if (sk_filter(sk, skb))
f0088a50
DV		 308 goto discard_and_relse;
309
310 skb->dev = NULL;
311
58a5a7b9
ACM		 312 if (nested)
313 bh_lock_sock_nested(sk);
314 else
315 bh_lock_sock(sk);
a5b5bb9a
IM		 316 if (!sock_owned_by_user(sk)) {
317 /*
318 * trylock + unlock semantics:
319 */
320 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
321
f0088a50 322 rc = sk->sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 323
324 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
325 } else
f0088a50
DV		 326 sk_add_backlog(sk, skb);
327 bh_unlock_sock(sk);
328out:
329 sock_put(sk);
330 return rc;
331discard_and_relse:
332 kfree_skb(skb);
333 goto out;
334}
335EXPORT_SYMBOL(sk_receive_skb);
336
337struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
338{
339 struct dst_entry *dst = sk->sk_dst_cache;
340
341 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
342 sk->sk_dst_cache = NULL;
343 dst_release(dst);
344 return NULL;
345 }
346
347 return dst;
348}
349EXPORT_SYMBOL(__sk_dst_check);
350
351struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
352{
353 struct dst_entry *dst = sk_dst_get(sk);
354
355 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
356 sk_dst_reset(sk);
357 dst_release(dst);
358 return NULL;
359 }
360
361 return dst;
362}
363EXPORT_SYMBOL(sk_dst_check);
364
1da177e4
LT		 365/*
366 * This is meant for all protocols to use and covers goings on
367 * at the socket level. Everything here is generic.
368 */
369
370int sock_setsockopt(struct socket *sock, int level, int optname,
371 char __user *optval, int optlen)
372{
373 struct sock *sk=sock->sk;
374 struct sk_filter *filter;
375 int val;
376 int valbool;
377 struct linger ling;
378 int ret = 0;
4ec93edb 379
1da177e4
LT		 380 /*
381 * Options without arguments
382 */
383
384#ifdef SO_DONTLINGER /* Compatibility item... */
a77be819
KM		 385 if (optname == SO_DONTLINGER) {
386 lock_sock(sk);
387 sock_reset_flag(sk, SOCK_LINGER);
388 release_sock(sk);
389 return 0;
1da177e4 390 }
a77be819 391#endif
4ec93edb 392
e71a4783
SH		 393 if (optlen < sizeof(int))
394 return -EINVAL;
4ec93edb 395
1da177e4
LT		 396 if (get_user(val, (int __user *)optval))
397 return -EFAULT;
4ec93edb
YH		 398
399 valbool = val?1:0;
1da177e4
LT		 400
401 lock_sock(sk);
402
e71a4783
SH		 403 switch(optname) {
404 case SO_DEBUG:
405 if (val && !capable(CAP_NET_ADMIN)) {
406 ret = -EACCES;
407 }
408 else if (valbool)
409 sock_set_flag(sk, SOCK_DBG);
410 else
411 sock_reset_flag(sk, SOCK_DBG);
412 break;
413 case SO_REUSEADDR:
414 sk->sk_reuse = valbool;
415 break;
416 case SO_TYPE:
417 case SO_ERROR:
418 ret = -ENOPROTOOPT;
419 break;
420 case SO_DONTROUTE:
421 if (valbool)
422 sock_set_flag(sk, SOCK_LOCALROUTE);
423 else
424 sock_reset_flag(sk, SOCK_LOCALROUTE);
425 break;
426 case SO_BROADCAST:
427 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
428 break;
429 case SO_SNDBUF:
430 /* Don't error on this BSD doesn't and if you think
431 about it this is right. Otherwise apps have to
432 play 'guess the biggest size' games. RCVBUF/SNDBUF
433 are treated in BSD as hints */
434
435 if (val > sysctl_wmem_max)
436 val = sysctl_wmem_max;
b0573dea 437set_sndbuf:
e71a4783
SH		 438 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
439 if ((val * 2) < SOCK_MIN_SNDBUF)
440 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
441 else
442 sk->sk_sndbuf = val * 2;
1da177e4 443
e71a4783
SH		 444 /*
445 * Wake up sending tasks if we
446 * upped the value.
447 */
448 sk->sk_write_space(sk);
449 break;
1da177e4 450
e71a4783
SH		 451 case SO_SNDBUFFORCE:
452 if (!capable(CAP_NET_ADMIN)) {
453 ret = -EPERM;
454 break;
455 }
456 goto set_sndbuf;
b0573dea 457
e71a4783
SH		 458 case SO_RCVBUF:
459 /* Don't error on this BSD doesn't and if you think
460 about it this is right. Otherwise apps have to
461 play 'guess the biggest size' games. RCVBUF/SNDBUF
462 are treated in BSD as hints */
4ec93edb 463
e71a4783
SH		 464 if (val > sysctl_rmem_max)
465 val = sysctl_rmem_max;
b0573dea 466set_rcvbuf:
e71a4783
SH		 467 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
468 /*
469 * We double it on the way in to account for
470 * "struct sk_buff" etc. overhead. Applications
471 * assume that the SO_RCVBUF setting they make will
472 * allow that much actual data to be received on that
473 * socket.
474 *
475 * Applications are unaware that "struct sk_buff" and
476 * other overheads allocate from the receive buffer
477 * during socket buffer allocation.
478 *
479 * And after considering the possible alternatives,
480 * returning the value we actually used in getsockopt
481 * is the most desirable behavior.
482 */
483 if ((val * 2) < SOCK_MIN_RCVBUF)
484 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
485 else
486 sk->sk_rcvbuf = val * 2;
487 break;
488
489 case SO_RCVBUFFORCE:
490 if (!capable(CAP_NET_ADMIN)) {
491 ret = -EPERM;
1da177e4 492 break;
e71a4783
SH		 493 }
494 goto set_rcvbuf;
1da177e4 495
e71a4783 496 case SO_KEEPALIVE:
1da177e4 497#ifdef CONFIG_INET
e71a4783
SH		 498 if (sk->sk_protocol == IPPROTO_TCP)
499 tcp_set_keepalive(sk, valbool);
1da177e4 500#endif
e71a4783
SH		 501 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
502 break;
503
504 case SO_OOBINLINE:
505 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
506 break;
507
508 case SO_NO_CHECK:
509 sk->sk_no_check = valbool;
510 break;
511
512 case SO_PRIORITY:
513 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
514 sk->sk_priority = val;
515 else
516 ret = -EPERM;
517 break;
518
519 case SO_LINGER:
520 if (optlen < sizeof(ling)) {
521 ret = -EINVAL; /* 1003.1g */
1da177e4 522 break;
e71a4783
SH		 523 }
524 if (copy_from_user(&ling,optval,sizeof(ling))) {
525 ret = -EFAULT;
1da177e4 526 break;
e71a4783
SH		 527 }
528 if (!ling.l_onoff)
529 sock_reset_flag(sk, SOCK_LINGER);
530 else {
1da177e4 531#if (BITS_PER_LONG == 32)
e71a4783
SH		 532 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
533 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 534 else
e71a4783
SH		 535#endif
536 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
537 sock_set_flag(sk, SOCK_LINGER);
538 }
539 break;
540
541 case SO_BSDCOMPAT:
542 sock_warn_obsolete_bsdism("setsockopt");
543 break;
544
545 case SO_PASSCRED:
546 if (valbool)
547 set_bit(SOCK_PASSCRED, &sock->flags);
548 else
549 clear_bit(SOCK_PASSCRED, &sock->flags);
550 break;
551
552 case SO_TIMESTAMP:
92f37fd2 553 case SO_TIMESTAMPNS:
e71a4783 554 if (valbool) {
92f37fd2
ED		 555 if (optname == SO_TIMESTAMP)
556 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
557 else
558 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 559 sock_set_flag(sk, SOCK_RCVTSTAMP);
560 sock_enable_timestamp(sk);
92f37fd2 561 } else {
e71a4783 562 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 563 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
564 }
e71a4783
SH		 565 break;
566
567 case SO_RCVLOWAT:
568 if (val < 0)
569 val = INT_MAX;
570 sk->sk_rcvlowat = val ? : 1;
571 break;
572
573 case SO_RCVTIMEO:
574 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
575 break;
576
577 case SO_SNDTIMEO:
578 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
579 break;
1da177e4 580
e71a4783
SH		 581#ifdef CONFIG_NETDEVICES
582 case SO_BINDTODEVICE:
583 {
584 char devname[IFNAMSIZ];
1da177e4 585
e71a4783
SH		 586 /* Sorry... */
587 if (!capable(CAP_NET_RAW)) {
588 ret = -EPERM;
1da177e4 589 break;
e71a4783 590 }
1da177e4 591
e71a4783
SH		 592 /* Bind this socket to a particular device like "eth0",
593 * as specified in the passed interface name. If the
594 * name is "" or the option length is zero the socket
595 * is not bound.
596 */
1da177e4 597
e71a4783
SH		 598 if (!valbool) {
599 sk->sk_bound_dev_if = 0;
600 } else {
601 if (optlen > IFNAMSIZ - 1)
602 optlen = IFNAMSIZ - 1;
603 memset(devname, 0, sizeof(devname));
604 if (copy_from_user(devname, optval, optlen)) {
605 ret = -EFAULT;
1da177e4
LT		 606 break;
607 }
608
e71a4783
SH		 609 /* Remove any cached route for this socket. */
610 sk_dst_reset(sk);
1da177e4 611
e71a4783 612 if (devname[0] == '\0') {
1da177e4
LT		 613 sk->sk_bound_dev_if = 0;
614 } else {
e71a4783
SH		 615 struct net_device *dev = dev_get_by_name(devname);
616 if (!dev) {
617 ret = -ENODEV;
1da177e4
LT		 618 break;
619 }
e71a4783
SH		 620 sk->sk_bound_dev_if = dev->ifindex;
621 dev_put(dev);
1da177e4 622 }
1da177e4 623 }
e71a4783
SH		 624 break;
625 }
1da177e4
LT		 626#endif
627
628
e71a4783
SH		 629 case SO_ATTACH_FILTER:
630 ret = -EINVAL;
631 if (optlen == sizeof(struct sock_fprog)) {
632 struct sock_fprog fprog;
1da177e4 633
e71a4783
SH		 634 ret = -EFAULT;
635 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 636 break;
e71a4783
SH		 637
638 ret = sk_attach_filter(&fprog, sk);
639 }
640 break;
641
642 case SO_DETACH_FILTER:
643 rcu_read_lock_bh();
644 filter = rcu_dereference(sk->sk_filter);
645 if (filter) {
646 rcu_assign_pointer(sk->sk_filter, NULL);
647 sk_filter_release(sk, filter);
fda9ef5d 648 rcu_read_unlock_bh();
1da177e4 649 break;
e71a4783
SH		 650 }
651 rcu_read_unlock_bh();
652 ret = -ENONET;
653 break;
1da177e4 654
e71a4783
SH		 655 case SO_PASSSEC:
656 if (valbool)
657 set_bit(SOCK_PASSSEC, &sock->flags);
658 else
659 clear_bit(SOCK_PASSSEC, &sock->flags);
660 break;
877ce7c1 661
1da177e4
LT		 662 /* We implement the SO_SNDLOWAT etc to
663 not be settable (1003.1g 5.3) */
e71a4783
SH		 664 default:
665 ret = -ENOPROTOOPT;
666 break;
4ec93edb 667 }
1da177e4
LT		 668 release_sock(sk);
669 return ret;
670}
671
672
673int sock_getsockopt(struct socket *sock, int level, int optname,
674 char __user *optval, int __user *optlen)
675{
676 struct sock *sk = sock->sk;
4ec93edb 677
e71a4783 678 union {
4ec93edb
YH		 679 int val;
680 struct linger ling;
1da177e4
LT		 681 struct timeval tm;
682 } v;
4ec93edb 683
1da177e4
LT		 684 unsigned int lv = sizeof(int);
685 int len;
4ec93edb 686
e71a4783 687 if (get_user(len, optlen))
4ec93edb 688 return -EFAULT;
e71a4783 689 if (len < 0)
1da177e4 690 return -EINVAL;
4ec93edb 691
e71a4783
SH		 692 switch(optname) {
693 case SO_DEBUG:
694 v.val = sock_flag(sk, SOCK_DBG);
695 break;
696
697 case SO_DONTROUTE:
698 v.val = sock_flag(sk, SOCK_LOCALROUTE);
699 break;
700
701 case SO_BROADCAST:
702 v.val = !!sock_flag(sk, SOCK_BROADCAST);
703 break;
704
705 case SO_SNDBUF:
706 v.val = sk->sk_sndbuf;
707 break;
708
709 case SO_RCVBUF:
710 v.val = sk->sk_rcvbuf;
711 break;
712
713 case SO_REUSEADDR:
714 v.val = sk->sk_reuse;
715 break;
716
717 case SO_KEEPALIVE:
718 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
719 break;
720
721 case SO_TYPE:
722 v.val = sk->sk_type;
723 break;
724
725 case SO_ERROR:
726 v.val = -sock_error(sk);
727 if (v.val==0)
728 v.val = xchg(&sk->sk_err_soft, 0);
729 break;
730
731 case SO_OOBINLINE:
732 v.val = !!sock_flag(sk, SOCK_URGINLINE);
733 break;
734
735 case SO_NO_CHECK:
736 v.val = sk->sk_no_check;
737 break;
738
739 case SO_PRIORITY:
740 v.val = sk->sk_priority;
741 break;
742
743 case SO_LINGER:
744 lv = sizeof(v.ling);
745 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
746 v.ling.l_linger = sk->sk_lingertime / HZ;
747 break;
748
749 case SO_BSDCOMPAT:
750 sock_warn_obsolete_bsdism("getsockopt");
751 break;
752
753 case SO_TIMESTAMP:
92f37fd2
ED		 754 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
755 !sock_flag(sk, SOCK_RCVTSTAMPNS);
756 break;
757
758 case SO_TIMESTAMPNS:
759 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 760 break;
761
762 case SO_RCVTIMEO:
763 lv=sizeof(struct timeval);
764 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
765 v.tm.tv_sec = 0;
766 v.tm.tv_usec = 0;
767 } else {
768 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
769 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
770 }
771 break;
772
773 case SO_SNDTIMEO:
774 lv=sizeof(struct timeval);
775 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
776 v.tm.tv_sec = 0;
777 v.tm.tv_usec = 0;
778 } else {
779 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
780 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
781 }
782 break;
1da177e4 783
e71a4783
SH		 784 case SO_RCVLOWAT:
785 v.val = sk->sk_rcvlowat;
786 break;
1da177e4 787
e71a4783
SH		 788 case SO_SNDLOWAT:
789 v.val=1;
790 break;
1da177e4 791
e71a4783
SH		 792 case SO_PASSCRED:
793 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
794 break;
1da177e4 795
e71a4783
SH		 796 case SO_PEERCRED:
797 if (len > sizeof(sk->sk_peercred))
798 len = sizeof(sk->sk_peercred);
799 if (copy_to_user(optval, &sk->sk_peercred, len))
800 return -EFAULT;
801 goto lenout;
1da177e4 802
e71a4783
SH		 803 case SO_PEERNAME:
804 {
805 char address[128];
806
807 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
808 return -ENOTCONN;
809 if (lv < len)
810 return -EINVAL;
811 if (copy_to_user(optval, address, len))
812 return -EFAULT;
813 goto lenout;
814 }
1da177e4 815
e71a4783
SH		 816 /* Dubious BSD thing... Probably nobody even uses it, but
817 * the UNIX standard wants it for whatever reason... -DaveM
818 */
819 case SO_ACCEPTCONN:
820 v.val = sk->sk_state == TCP_LISTEN;
821 break;
1da177e4 822
e71a4783
SH		 823 case SO_PASSSEC:
824 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
825 break;
877ce7c1 826
e71a4783
SH		 827 case SO_PEERSEC:
828 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 829
e71a4783
SH		 830 default:
831 return -ENOPROTOOPT;
1da177e4 832 }
e71a4783 833
1da177e4
LT		 834 if (len > lv)
835 len = lv;
836 if (copy_to_user(optval, &v, len))
837 return -EFAULT;
838lenout:
4ec93edb
YH		 839 if (put_user(len, optlen))
840 return -EFAULT;
841 return 0;
1da177e4
LT		 842}
843
a5b5bb9a
IM		 844/*
845 * Initialize an sk_lock.
846 *
847 * (We also register the sk_lock with the lock validator.)
848 */
b6f99a21 849static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 850{
ed07536e
PZ		 851 sock_lock_init_class_and_name(sk,
852 af_family_slock_key_strings[sk->sk_family],
853 af_family_slock_keys + sk->sk_family,
854 af_family_key_strings[sk->sk_family],
855 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 856}
857
1da177e4
LT		 858/**
859 * sk_alloc - All socket objects are allocated here
4dc3b16b
PP		 860 * @family: protocol family
861 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
862 * @prot: struct proto associated with this new sock instance
863 * @zero_it: if we should zero the newly allocated sock
1da177e4 864 */
dd0fc66f 865struct sock *sk_alloc(int family, gfp_t priority,
86a76caf 866 struct proto *prot, int zero_it)
1da177e4
LT		 867{
868 struct sock *sk = NULL;
e18b890b 869 struct kmem_cache *slab = prot->slab;
1da177e4
LT		 870
871 if (slab != NULL)
872 sk = kmem_cache_alloc(slab, priority);
873 else
874 sk = kmalloc(prot->obj_size, priority);
875
876 if (sk) {
877 if (zero_it) {
878 memset(sk, 0, prot->obj_size);
879 sk->sk_family = family;
476e19cf
ACM		 880 /*
881 * See comment in struct sock definition to understand
882 * why we need sk_prot_creator -acme
883 */
884 sk->sk_prot = sk->sk_prot_creator = prot;
1da177e4
LT		 885 sock_lock_init(sk);
886 }
4ec93edb 887
a79af59e
FF		 888 if (security_sk_alloc(sk, family, priority))
889 goto out_free;
890
891 if (!try_module_get(prot->owner))
892 goto out_free;
1da177e4
LT		 893 }
894 return sk;
a79af59e
FF		 895
896out_free:
897 if (slab != NULL)
898 kmem_cache_free(slab, sk);
899 else
900 kfree(sk);
901 return NULL;
1da177e4
LT		 902}
903
904void sk_free(struct sock *sk)
905{
906 struct sk_filter *filter;
476e19cf 907 struct module *owner = sk->sk_prot_creator->owner;
1da177e4
LT		 908
909 if (sk->sk_destruct)
910 sk->sk_destruct(sk);
911
fda9ef5d 912 filter = rcu_dereference(sk->sk_filter);
1da177e4
LT		 913 if (filter) {
914 sk_filter_release(sk, filter);
fda9ef5d 915 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 916 }
917
918 sock_disable_timestamp(sk);
919
920 if (atomic_read(&sk->sk_omem_alloc))
921 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
922 __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
923
924 security_sk_free(sk);
476e19cf
ACM		 925 if (sk->sk_prot_creator->slab != NULL)
926 kmem_cache_free(sk->sk_prot_creator->slab, sk);
1da177e4
LT		 927 else
928 kfree(sk);
929 module_put(owner);
930}
931
dd0fc66f 932struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb
ACM		 933{
934 struct sock *newsk = sk_alloc(sk->sk_family, priority, sk->sk_prot, 0);
935
936 if (newsk != NULL) {
937 struct sk_filter *filter;
938
892c141e 939 sock_copy(newsk, sk);
87d11ceb
ACM		 940
941 /* SANITY */
942 sk_node_init(&newsk->sk_node);
943 sock_lock_init(newsk);
944 bh_lock_sock(newsk);
fa438ccf 945 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
87d11ceb
ACM		 946
947 atomic_set(&newsk->sk_rmem_alloc, 0);
948 atomic_set(&newsk->sk_wmem_alloc, 0);
949 atomic_set(&newsk->sk_omem_alloc, 0);
950 skb_queue_head_init(&newsk->sk_receive_queue);
951 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 952#ifdef CONFIG_NET_DMA
953 skb_queue_head_init(&newsk->sk_async_wait_queue);
954#endif
87d11ceb
ACM		 955
956 rwlock_init(&newsk->sk_dst_lock);
957 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 958 lockdep_set_class_and_name(&newsk->sk_callback_lock,
959 af_callback_keys + newsk->sk_family,
960 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 961
962 newsk->sk_dst_cache = NULL;
963 newsk->sk_wmem_queued = 0;
964 newsk->sk_forward_alloc = 0;
965 newsk->sk_send_head = NULL;
87d11ceb
ACM		 966 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
967
968 sock_reset_flag(newsk, SOCK_DONE);
969 skb_queue_head_init(&newsk->sk_error_queue);
970
971 filter = newsk->sk_filter;
972 if (filter != NULL)
973 sk_filter_charge(newsk, filter);
974
975 if (unlikely(xfrm_sk_clone_policy(newsk))) {
976 /* It is still raw copy of parent, so invalidate
977 * destructor and make plain sk_free() */
978 newsk->sk_destruct = NULL;
979 sk_free(newsk);
980 newsk = NULL;
981 goto out;
982 }
983
984 newsk->sk_err = 0;
985 newsk->sk_priority = 0;
986 atomic_set(&newsk->sk_refcnt, 2);
987
988 /*
989 * Increment the counter in the same struct proto as the master
990 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
991 * is the same as sk->sk_prot->socks, as this field was copied
992 * with memcpy).
993 *
994 * This _changes_ the previous behaviour, where
995 * tcp_create_openreq_child always was incrementing the
996 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
997 * to be taken into account in all callers. -acme
998 */
999 sk_refcnt_debug_inc(newsk);
1000 newsk->sk_socket = NULL;
1001 newsk->sk_sleep = NULL;
1002
1003 if (newsk->sk_prot->sockets_allocated)
1004 atomic_inc(newsk->sk_prot->sockets_allocated);
1005 }
1006out:
1007 return newsk;
1008}
1009
1010EXPORT_SYMBOL_GPL(sk_clone);
1011
9958089a
AK		 1012void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1013{
1014 __sk_dst_set(sk, dst);
1015 sk->sk_route_caps = dst->dev->features;
1016 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1017 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
9958089a
AK		 1018 if (sk_can_gso(sk)) {
1019 if (dst->header_len)
1020 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1021 else
1022 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1023 }
1024}
1025EXPORT_SYMBOL_GPL(sk_setup_caps);
1026
1da177e4
LT		 1027void __init sk_init(void)
1028{
1029 if (num_physpages <= 4096) {
1030 sysctl_wmem_max = 32767;
1031 sysctl_rmem_max = 32767;
1032 sysctl_wmem_default = 32767;
1033 sysctl_rmem_default = 32767;
1034 } else if (num_physpages >= 131072) {
1035 sysctl_wmem_max = 131071;
1036 sysctl_rmem_max = 131071;
1037 }
1038}
1039
1040/*
1041 * Simple resource managers for sockets.
1042 */
1043
1044
4ec93edb
YH		 1045/*
1046 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1047 */
1048void sock_wfree(struct sk_buff *skb)
1049{
1050 struct sock *sk = skb->sk;
1051
1052 /* In case it might be waiting for more memory. */
1053 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1054 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1055 sk->sk_write_space(sk);
1056 sock_put(sk);
1057}
1058
4ec93edb
YH		 1059/*
1060 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1061 */
1062void sock_rfree(struct sk_buff *skb)
1063{
1064 struct sock *sk = skb->sk;
1065
1066 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1067}
1068
1069
1070int sock_i_uid(struct sock *sk)
1071{
1072 int uid;
1073
1074 read_lock(&sk->sk_callback_lock);
1075 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1076 read_unlock(&sk->sk_callback_lock);
1077 return uid;
1078}
1079
1080unsigned long sock_i_ino(struct sock *sk)
1081{
1082 unsigned long ino;
1083
1084 read_lock(&sk->sk_callback_lock);
1085 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1086 read_unlock(&sk->sk_callback_lock);
1087 return ino;
1088}
1089
1090/*
1091 * Allocate a skb from the socket's send buffer.
1092 */
86a76caf 1093struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1094 gfp_t priority)
1da177e4
LT		 1095{
1096 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1097 struct sk_buff * skb = alloc_skb(size, priority);
1098 if (skb) {
1099 skb_set_owner_w(skb, sk);
1100 return skb;
1101 }
1102 }
1103 return NULL;
1104}
1105
1106/*
1107 * Allocate a skb from the socket's receive buffer.
4ec93edb 1108 */
86a76caf 1109struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1110 gfp_t priority)
1da177e4
LT		 1111{
1112 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1113 struct sk_buff *skb = alloc_skb(size, priority);
1114 if (skb) {
1115 skb_set_owner_r(skb, sk);
1116 return skb;
1117 }
1118 }
1119 return NULL;
1120}
1121
4ec93edb 1122/*
1da177e4 1123 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1124 */
dd0fc66f 1125void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1126{
1127 if ((unsigned)size <= sysctl_optmem_max &&
1128 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1129 void *mem;
1130 /* First do the add, to avoid the race if kmalloc
4ec93edb 1131 * might sleep.
1da177e4
LT		 1132 */
1133 atomic_add(size, &sk->sk_omem_alloc);
1134 mem = kmalloc(size, priority);
1135 if (mem)
1136 return mem;
1137 atomic_sub(size, &sk->sk_omem_alloc);
1138 }
1139 return NULL;
1140}
1141
1142/*
1143 * Free an option memory block.
1144 */
1145void sock_kfree_s(struct sock *sk, void *mem, int size)
1146{
1147 kfree(mem);
1148 atomic_sub(size, &sk->sk_omem_alloc);
1149}
1150
1151/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1152 I think, these locks should be removed for datagram sockets.
1153 */
1154static long sock_wait_for_wmem(struct sock * sk, long timeo)
1155{
1156 DEFINE_WAIT(wait);
1157
1158 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1159 for (;;) {
1160 if (!timeo)
1161 break;
1162 if (signal_pending(current))
1163 break;
1164 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1165 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1166 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1167 break;
1168 if (sk->sk_shutdown & SEND_SHUTDOWN)
1169 break;
1170 if (sk->sk_err)
1171 break;
1172 timeo = schedule_timeout(timeo);
1173 }
1174 finish_wait(sk->sk_sleep, &wait);
1175 return timeo;
1176}
1177
1178
1179/*
1180 * Generic send/receive buffer handlers
1181 */
1182
1183static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1184 unsigned long header_len,
1185 unsigned long data_len,
1186 int noblock, int *errcode)
1187{
1188 struct sk_buff *skb;
7d877f3b 1189 gfp_t gfp_mask;
1da177e4
LT		 1190 long timeo;
1191 int err;
1192
1193 gfp_mask = sk->sk_allocation;
1194 if (gfp_mask & __GFP_WAIT)
1195 gfp_mask |= __GFP_REPEAT;
1196
1197 timeo = sock_sndtimeo(sk, noblock);
1198 while (1) {
1199 err = sock_error(sk);
1200 if (err != 0)
1201 goto failure;
1202
1203 err = -EPIPE;
1204 if (sk->sk_shutdown & SEND_SHUTDOWN)
1205 goto failure;
1206
1207 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1208 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1209 if (skb) {
1210 int npages;
1211 int i;
1212
1213 /* No pages, we're done... */
1214 if (!data_len)
1215 break;
1216
1217 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1218 skb->truesize += data_len;
1219 skb_shinfo(skb)->nr_frags = npages;
1220 for (i = 0; i < npages; i++) {
1221 struct page *page;
1222 skb_frag_t *frag;
1223
1224 page = alloc_pages(sk->sk_allocation, 0);
1225 if (!page) {
1226 err = -ENOBUFS;
1227 skb_shinfo(skb)->nr_frags = i;
1228 kfree_skb(skb);
1229 goto failure;
1230 }
1231
1232 frag = &skb_shinfo(skb)->frags[i];
1233 frag->page = page;
1234 frag->page_offset = 0;
1235 frag->size = (data_len >= PAGE_SIZE ?
1236 PAGE_SIZE :
1237 data_len);
1238 data_len -= PAGE_SIZE;
1239 }
1240
1241 /* Full success... */
1242 break;
1243 }
1244 err = -ENOBUFS;
1245 goto failure;
1246 }
1247 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1248 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1249 err = -EAGAIN;
1250 if (!timeo)
1251 goto failure;
1252 if (signal_pending(current))
1253 goto interrupted;
1254 timeo = sock_wait_for_wmem(sk, timeo);
1255 }
1256
1257 skb_set_owner_w(skb, sk);
1258 return skb;
1259
1260interrupted:
1261 err = sock_intr_errno(timeo);
1262failure:
1263 *errcode = err;
1264 return NULL;
1265}
1266
4ec93edb 1267struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1268 int noblock, int *errcode)
1269{
1270 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1271}
1272
1273static void __lock_sock(struct sock *sk)
1274{
1275 DEFINE_WAIT(wait);
1276
e71a4783 1277 for (;;) {
1da177e4
LT		 1278 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1279 TASK_UNINTERRUPTIBLE);
1280 spin_unlock_bh(&sk->sk_lock.slock);
1281 schedule();
1282 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1283 if (!sock_owned_by_user(sk))
1da177e4
LT		 1284 break;
1285 }
1286 finish_wait(&sk->sk_lock.wq, &wait);
1287}
1288
1289static void __release_sock(struct sock *sk)
1290{
1291 struct sk_buff *skb = sk->sk_backlog.head;
1292
1293 do {
1294 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1295 bh_unlock_sock(sk);
1296
1297 do {
1298 struct sk_buff *next = skb->next;
1299
1300 skb->next = NULL;
1301 sk->sk_backlog_rcv(sk, skb);
1302
1303 /*
1304 * We are in process context here with softirqs
1305 * disabled, use cond_resched_softirq() to preempt.
1306 * This is safe to do because we've taken the backlog
1307 * queue private:
1308 */
1309 cond_resched_softirq();
1310
1311 skb = next;
1312 } while (skb != NULL);
1313
1314 bh_lock_sock(sk);
e71a4783 1315 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1316}
1317
1318/**
1319 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1320 * @sk: sock to wait on
1321 * @timeo: for how long
1da177e4
LT		 1322 *
1323 * Now socket state including sk->sk_err is changed only under lock,
1324 * hence we may omit checks after joining wait queue.
1325 * We check receive queue before schedule() only as optimization;
1326 * it is very likely that release_sock() added new data.
1327 */
1328int sk_wait_data(struct sock *sk, long *timeo)
1329{
1330 int rc;
1331 DEFINE_WAIT(wait);
1332
1333 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1334 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1335 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1336 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1337 finish_wait(sk->sk_sleep, &wait);
1338 return rc;
1339}
1340
1341EXPORT_SYMBOL(sk_wait_data);
1342
1343/*
1344 * Set of default routines for initialising struct proto_ops when
1345 * the protocol does not support a particular function. In certain
1346 * cases where it makes no sense for a protocol to have a "do nothing"
1347 * function, some default processing is provided.
1348 */
1349
1350int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1351{
1352 return -EOPNOTSUPP;
1353}
1354
4ec93edb 1355int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1356 int len, int flags)
1357{
1358 return -EOPNOTSUPP;
1359}
1360
1361int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1362{
1363 return -EOPNOTSUPP;
1364}
1365
1366int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1367{
1368 return -EOPNOTSUPP;
1369}
1370
4ec93edb 1371int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1372 int *len, int peer)
1373{
1374 return -EOPNOTSUPP;
1375}
1376
1377unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1378{
1379 return 0;
1380}
1381
1382int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1383{
1384 return -EOPNOTSUPP;
1385}
1386
1387int sock_no_listen(struct socket *sock, int backlog)
1388{
1389 return -EOPNOTSUPP;
1390}
1391
1392int sock_no_shutdown(struct socket *sock, int how)
1393{
1394 return -EOPNOTSUPP;
1395}
1396
1397int sock_no_setsockopt(struct socket *sock, int level, int optname,
1398 char __user *optval, int optlen)
1399{
1400 return -EOPNOTSUPP;
1401}
1402
1403int sock_no_getsockopt(struct socket *sock, int level, int optname,
1404 char __user *optval, int __user *optlen)
1405{
1406 return -EOPNOTSUPP;
1407}
1408
1409int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1410 size_t len)
1411{
1412 return -EOPNOTSUPP;
1413}
1414
1415int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1416 size_t len, int flags)
1417{
1418 return -EOPNOTSUPP;
1419}
1420
1421int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1422{
1423 /* Mirror missing mmap method error code */
1424 return -ENODEV;
1425}
1426
1427ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1428{
1429 ssize_t res;
1430 struct msghdr msg = {.msg_flags = flags};
1431 struct kvec iov;
1432 char *kaddr = kmap(page);
1433 iov.iov_base = kaddr + offset;
1434 iov.iov_len = size;
1435 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1436 kunmap(page);
1437 return res;
1438}
1439
1440/*
1441 * Default Socket Callbacks
1442 */
1443
1444static void sock_def_wakeup(struct sock *sk)
1445{
1446 read_lock(&sk->sk_callback_lock);
1447 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1448 wake_up_interruptible_all(sk->sk_sleep);
1449 read_unlock(&sk->sk_callback_lock);
1450}
1451
1452static void sock_def_error_report(struct sock *sk)
1453{
1454 read_lock(&sk->sk_callback_lock);
1455 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1456 wake_up_interruptible(sk->sk_sleep);
4ec93edb 1457 sk_wake_async(sk,0,POLL_ERR);
1da177e4
LT		 1458 read_unlock(&sk->sk_callback_lock);
1459}
1460
1461static void sock_def_readable(struct sock *sk, int len)
1462{
1463 read_lock(&sk->sk_callback_lock);
1464 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1465 wake_up_interruptible(sk->sk_sleep);
1466 sk_wake_async(sk,1,POLL_IN);
1467 read_unlock(&sk->sk_callback_lock);
1468}
1469
1470static void sock_def_write_space(struct sock *sk)
1471{
1472 read_lock(&sk->sk_callback_lock);
1473
1474 /* Do not wake up a writer until he can make "significant"
1475 * progress. --DaveM
1476 */
e71a4783 1477 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1da177e4
LT		 1478 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1479 wake_up_interruptible(sk->sk_sleep);
1480
1481 /* Should agree with poll, otherwise some programs break */
1482 if (sock_writeable(sk))
1483 sk_wake_async(sk, 2, POLL_OUT);
1484 }
1485
1486 read_unlock(&sk->sk_callback_lock);
1487}
1488
1489static void sock_def_destruct(struct sock *sk)
1490{
a51482bd 1491 kfree(sk->sk_protinfo);
1da177e4
LT		 1492}
1493
1494void sk_send_sigurg(struct sock *sk)
1495{
1496 if (sk->sk_socket && sk->sk_socket->file)
1497 if (send_sigurg(&sk->sk_socket->file->f_owner))
1498 sk_wake_async(sk, 3, POLL_PRI);
1499}
1500
1501void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1502 unsigned long expires)
1503{
1504 if (!mod_timer(timer, expires))
1505 sock_hold(sk);
1506}
1507
1508EXPORT_SYMBOL(sk_reset_timer);
1509
1510void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1511{
1512 if (timer_pending(timer) && del_timer(timer))
1513 __sock_put(sk);
1514}
1515
1516EXPORT_SYMBOL(sk_stop_timer);
1517
1518void sock_init_data(struct socket *sock, struct sock *sk)
1519{
1520 skb_queue_head_init(&sk->sk_receive_queue);
1521 skb_queue_head_init(&sk->sk_write_queue);
1522 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1523#ifdef CONFIG_NET_DMA
1524 skb_queue_head_init(&sk->sk_async_wait_queue);
1525#endif
1da177e4
LT		 1526
1527 sk->sk_send_head = NULL;
1528
1529 init_timer(&sk->sk_timer);
4ec93edb 1530
1da177e4
LT		 1531 sk->sk_allocation = GFP_KERNEL;
1532 sk->sk_rcvbuf = sysctl_rmem_default;
1533 sk->sk_sndbuf = sysctl_wmem_default;
1534 sk->sk_state = TCP_CLOSE;
1535 sk->sk_socket = sock;
1536
1537 sock_set_flag(sk, SOCK_ZAPPED);
1538
e71a4783 1539 if (sock) {
1da177e4
LT		 1540 sk->sk_type = sock->type;
1541 sk->sk_sleep = &sock->wait;
1542 sock->sk = sk;
1543 } else
1544 sk->sk_sleep = NULL;
1545
1546 rwlock_init(&sk->sk_dst_lock);
1547 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1548 lockdep_set_class_and_name(&sk->sk_callback_lock,
1549 af_callback_keys + sk->sk_family,
1550 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1551
1552 sk->sk_state_change = sock_def_wakeup;
1553 sk->sk_data_ready = sock_def_readable;
1554 sk->sk_write_space = sock_def_write_space;
1555 sk->sk_error_report = sock_def_error_report;
1556 sk->sk_destruct = sock_def_destruct;
1557
1558 sk->sk_sndmsg_page = NULL;
1559 sk->sk_sndmsg_off = 0;
1560
1561 sk->sk_peercred.pid = 0;
1562 sk->sk_peercred.uid = -1;
1563 sk->sk_peercred.gid = -1;
1564 sk->sk_write_pending = 0;
1565 sk->sk_rcvlowat = 1;
1566 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1567 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1568
b7aa0bf7 1569 sk->sk_stamp = ktime_set(-1L, -1L);
1da177e4
LT		 1570
1571 atomic_set(&sk->sk_refcnt, 1);
1572}
1573
fcc70d5f 1574void fastcall lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1575{
1576 might_sleep();
a5b5bb9a 1577 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1578 if (sk->sk_lock.owner)
1579 __lock_sock(sk);
1580 sk->sk_lock.owner = (void *)1;
a5b5bb9a
IM		 1581 spin_unlock(&sk->sk_lock.slock);
1582 /*
1583 * The sk_lock has mutex_lock() semantics here:
1584 */
fcc70d5f 1585 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1586 local_bh_enable();
1da177e4
LT		 1587}
1588
fcc70d5f 1589EXPORT_SYMBOL(lock_sock_nested);
1da177e4
LT		 1590
1591void fastcall release_sock(struct sock *sk)
1592{
a5b5bb9a
IM		 1593 /*
1594 * The sk_lock has mutex_unlock() semantics:
1595 */
1596 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1597
1598 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1599 if (sk->sk_backlog.tail)
1600 __release_sock(sk);
1601 sk->sk_lock.owner = NULL;
a5b5bb9a
IM		 1602 if (waitqueue_active(&sk->sk_lock.wq))
1603 wake_up(&sk->sk_lock.wq);
1604 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1605}
1606EXPORT_SYMBOL(release_sock);
1607
1608int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1609{
b7aa0bf7 1610 struct timeval tv;
1da177e4
LT		 1611 if (!sock_flag(sk, SOCK_TIMESTAMP))
1612 sock_enable_timestamp(sk);
b7aa0bf7
ED		 1613 tv = ktime_to_timeval(sk->sk_stamp);
1614 if (tv.tv_sec == -1)
1da177e4 1615 return -ENOENT;
b7aa0bf7
ED		 1616 if (tv.tv_sec == 0) {
1617 sk->sk_stamp = ktime_get_real();
1618 tv = ktime_to_timeval(sk->sk_stamp);
1619 }
1620 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1621}
1da177e4
LT		 1622EXPORT_SYMBOL(sock_get_timestamp);
1623
ae40eb1e
ED		 1624int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1625{
1626 struct timespec ts;
1627 if (!sock_flag(sk, SOCK_TIMESTAMP))
1628 sock_enable_timestamp(sk);
1629 ts = ktime_to_timespec(sk->sk_stamp);
1630 if (ts.tv_sec == -1)
1631 return -ENOENT;
1632 if (ts.tv_sec == 0) {
1633 sk->sk_stamp = ktime_get_real();
1634 ts = ktime_to_timespec(sk->sk_stamp);
1635 }
1636 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1637}
1638EXPORT_SYMBOL(sock_get_timestampns);
1639
1da177e4 1640void sock_enable_timestamp(struct sock *sk)
4ec93edb
YH		 1641{
1642 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 1643 sock_set_flag(sk, SOCK_TIMESTAMP);
1644 net_enable_timestamp();
1645 }
1646}
4ec93edb 1647EXPORT_SYMBOL(sock_enable_timestamp);
1da177e4
LT		 1648
1649/*
1650 * Get a socket option on an socket.
1651 *
1652 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1653 * asynchronous errors should be reported by getsockopt. We assume
1654 * this means if you specify SO_ERROR (otherwise whats the point of it).
1655 */
1656int sock_common_getsockopt(struct socket *sock, int level, int optname,
1657 char __user *optval, int __user *optlen)
1658{
1659 struct sock *sk = sock->sk;
1660
1661 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1662}
1663
1664EXPORT_SYMBOL(sock_common_getsockopt);
1665
3fdadf7d 1666#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1667int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1668 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1669{
1670 struct sock *sk = sock->sk;
1671
1e51f951 1672 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 1673 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1674 optval, optlen);
3fdadf7d
DM		 1675 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1676}
1677EXPORT_SYMBOL(compat_sock_common_getsockopt);
1678#endif
1679
1da177e4
LT		 1680int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1681 struct msghdr *msg, size_t size, int flags)
1682{
1683 struct sock *sk = sock->sk;
1684 int addr_len = 0;
1685 int err;
1686
1687 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1688 flags & ~MSG_DONTWAIT, &addr_len);
1689 if (err >= 0)
1690 msg->msg_namelen = addr_len;
1691 return err;
1692}
1693
1694EXPORT_SYMBOL(sock_common_recvmsg);
1695
1696/*
1697 * Set socket options on an inet socket.
1698 */
1699int sock_common_setsockopt(struct socket *sock, int level, int optname,
1700 char __user *optval, int optlen)
1701{
1702 struct sock *sk = sock->sk;
1703
1704 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1705}
1706
1707EXPORT_SYMBOL(sock_common_setsockopt);
1708
3fdadf7d 1709#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1710int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1711 char __user *optval, int optlen)
3fdadf7d
DM		 1712{
1713 struct sock *sk = sock->sk;
1714
543d9cfe
ACM		 1715 if (sk->sk_prot->compat_setsockopt != NULL)
1716 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1717 optval, optlen);
3fdadf7d
DM		 1718 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1719}
1720EXPORT_SYMBOL(compat_sock_common_setsockopt);
1721#endif
1722
1da177e4
LT		 1723void sk_common_release(struct sock *sk)
1724{
1725 if (sk->sk_prot->destroy)
1726 sk->sk_prot->destroy(sk);
1727
1728 /*
1729 * Observation: when sock_common_release is called, processes have
1730 * no access to socket. But net still has.
1731 * Step one, detach it from networking:
1732 *
1733 * A. Remove from hash tables.
1734 */
1735
1736 sk->sk_prot->unhash(sk);
1737
1738 /*
1739 * In this point socket cannot receive new packets, but it is possible
1740 * that some packets are in flight because some CPU runs receiver and
1741 * did hash table lookup before we unhashed socket. They will achieve
1742 * receive queue and will be purged by socket destructor.
1743 *
1744 * Also we still have packets pending on receive queue and probably,
1745 * our own packets waiting in device queues. sock_destroy will drain
1746 * receive queue, but transmitted packets will delay socket destruction
1747 * until the last reference will be released.
1748 */
1749
1750 sock_orphan(sk);
1751
1752 xfrm_sk_free_policy(sk);
1753
e6848976 1754 sk_refcnt_debug_release(sk);
1da177e4
LT		 1755 sock_put(sk);
1756}
1757
1758EXPORT_SYMBOL(sk_common_release);
1759
1760static DEFINE_RWLOCK(proto_list_lock);
1761static LIST_HEAD(proto_list);
1762
1763int proto_register(struct proto *prot, int alloc_slab)
1764{
8feaf0c0
ACM		 1765 char *request_sock_slab_name = NULL;
1766 char *timewait_sock_slab_name;
1da177e4
LT		 1767 int rc = -ENOBUFS;
1768
1da177e4
LT		 1769 if (alloc_slab) {
1770 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
20c2df83 1771 SLAB_HWCACHE_ALIGN, NULL);
1da177e4
LT		 1772
1773 if (prot->slab == NULL) {
1774 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
1775 prot->name);
2a278051 1776 goto out;
1da177e4 1777 }
2e6599cb
ACM		 1778
1779 if (prot->rsk_prot != NULL) {
1780 static const char mask[] = "request_sock_%s";
1781
1782 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1783 if (request_sock_slab_name == NULL)
1784 goto out_free_sock_slab;
1785
1786 sprintf(request_sock_slab_name, mask, prot->name);
1787 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
1788 prot->rsk_prot->obj_size, 0,
20c2df83 1789 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 1790
1791 if (prot->rsk_prot->slab == NULL) {
1792 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
1793 prot->name);
1794 goto out_free_request_sock_slab_name;
1795 }
1796 }
8feaf0c0 1797
6d6ee43e 1798 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 1799 static const char mask[] = "tw_sock_%s";
1800
1801 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1802
1803 if (timewait_sock_slab_name == NULL)
1804 goto out_free_request_sock_slab;
1805
1806 sprintf(timewait_sock_slab_name, mask, prot->name);
6d6ee43e
ACM		 1807 prot->twsk_prot->twsk_slab =
1808 kmem_cache_create(timewait_sock_slab_name,
1809 prot->twsk_prot->twsk_obj_size,
1810 0, SLAB_HWCACHE_ALIGN,
20c2df83 1811 NULL);
6d6ee43e 1812 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 1813 goto out_free_timewait_sock_slab_name;
1814 }
1da177e4
LT		 1815 }
1816
2a278051 1817 write_lock(&proto_list_lock);
1da177e4 1818 list_add(&prot->node, &proto_list);
1da177e4 1819 write_unlock(&proto_list_lock);
2a278051
ACM		 1820 rc = 0;
1821out:
1da177e4 1822 return rc;
8feaf0c0
ACM		 1823out_free_timewait_sock_slab_name:
1824 kfree(timewait_sock_slab_name);
1825out_free_request_sock_slab:
1826 if (prot->rsk_prot && prot->rsk_prot->slab) {
1827 kmem_cache_destroy(prot->rsk_prot->slab);
1828 prot->rsk_prot->slab = NULL;
1829 }
2e6599cb
ACM		 1830out_free_request_sock_slab_name:
1831 kfree(request_sock_slab_name);
1832out_free_sock_slab:
1833 kmem_cache_destroy(prot->slab);
1834 prot->slab = NULL;
1835 goto out;
1da177e4
LT		 1836}
1837
1838EXPORT_SYMBOL(proto_register);
1839
1840void proto_unregister(struct proto *prot)
1841{
1842 write_lock(&proto_list_lock);
0a3f4358
PM		 1843 list_del(&prot->node);
1844 write_unlock(&proto_list_lock);
1da177e4
LT		 1845
1846 if (prot->slab != NULL) {
1847 kmem_cache_destroy(prot->slab);
1848 prot->slab = NULL;
1849 }
1850
2e6599cb
ACM		 1851 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
1852 const char *name = kmem_cache_name(prot->rsk_prot->slab);
1853
1854 kmem_cache_destroy(prot->rsk_prot->slab);
1855 kfree(name);
1856 prot->rsk_prot->slab = NULL;
1857 }
1858
6d6ee43e
ACM		 1859 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
1860 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
8feaf0c0 1861
6d6ee43e 1862 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
8feaf0c0 1863 kfree(name);
6d6ee43e 1864 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 1865 }
1da177e4
LT		 1866}
1867
1868EXPORT_SYMBOL(proto_unregister);
1869
1870#ifdef CONFIG_PROC_FS
1da177e4
LT		 1871static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
1872{
1873 read_lock(&proto_list_lock);
60f0438a 1874 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 1875}
1876
1877static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1878{
60f0438a 1879 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 1880}
1881
1882static void proto_seq_stop(struct seq_file *seq, void *v)
1883{
1884 read_unlock(&proto_list_lock);
1885}
1886
1887static char proto_method_implemented(const void *method)
1888{
1889 return method == NULL ? 'n' : 'y';
1890}
1891
1892static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
1893{
1894 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
1895 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
1896 proto->name,
1897 proto->obj_size,
1898 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
1899 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
1900 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
1901 proto->max_header,
1902 proto->slab == NULL ? "no" : "yes",
1903 module_name(proto->owner),
1904 proto_method_implemented(proto->close),
1905 proto_method_implemented(proto->connect),
1906 proto_method_implemented(proto->disconnect),
1907 proto_method_implemented(proto->accept),
1908 proto_method_implemented(proto->ioctl),
1909 proto_method_implemented(proto->init),
1910 proto_method_implemented(proto->destroy),
1911 proto_method_implemented(proto->shutdown),
1912 proto_method_implemented(proto->setsockopt),
1913 proto_method_implemented(proto->getsockopt),
1914 proto_method_implemented(proto->sendmsg),
1915 proto_method_implemented(proto->recvmsg),
1916 proto_method_implemented(proto->sendpage),
1917 proto_method_implemented(proto->bind),
1918 proto_method_implemented(proto->backlog_rcv),
1919 proto_method_implemented(proto->hash),
1920 proto_method_implemented(proto->unhash),
1921 proto_method_implemented(proto->get_port),
1922 proto_method_implemented(proto->enter_memory_pressure));
1923}
1924
1925static int proto_seq_show(struct seq_file *seq, void *v)
1926{
60f0438a 1927 if (v == &proto_list)
1da177e4
LT		 1928 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
1929 "protocol",
1930 "size",
1931 "sockets",
1932 "memory",
1933 "press",
1934 "maxhdr",
1935 "slab",
1936 "module",
1937 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
1938 else
60f0438a 1939 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 1940 return 0;
1941}
1942
f690808e 1943static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 1944 .start = proto_seq_start,
1945 .next = proto_seq_next,
1946 .stop = proto_seq_stop,
1947 .show = proto_seq_show,
1948};
1949
1950static int proto_seq_open(struct inode *inode, struct file *file)
1951{
1952 return seq_open(file, &proto_seq_ops);
1953}
1954
9a32144e 1955static const struct file_operations proto_seq_fops = {
1da177e4
LT		 1956 .owner = THIS_MODULE,
1957 .open = proto_seq_open,
1958 .read = seq_read,
1959 .llseek = seq_lseek,
1960 .release = seq_release,
1961};
1962
1963static int __init proto_init(void)
1964{
1965 /* register /proc/net/protocols */
1966 return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
1967}
1968
1969subsys_initcall(proto_init);
1970
1971#endif /* PROC_FS */
1972
1973EXPORT_SYMBOL(sk_alloc);
1974EXPORT_SYMBOL(sk_free);
1975EXPORT_SYMBOL(sk_send_sigurg);
1976EXPORT_SYMBOL(sock_alloc_send_skb);
1977EXPORT_SYMBOL(sock_init_data);
1978EXPORT_SYMBOL(sock_kfree_s);
1979EXPORT_SYMBOL(sock_kmalloc);
1980EXPORT_SYMBOL(sock_no_accept);
1981EXPORT_SYMBOL(sock_no_bind);
1982EXPORT_SYMBOL(sock_no_connect);
1983EXPORT_SYMBOL(sock_no_getname);
1984EXPORT_SYMBOL(sock_no_getsockopt);
1985EXPORT_SYMBOL(sock_no_ioctl);
1986EXPORT_SYMBOL(sock_no_listen);
1987EXPORT_SYMBOL(sock_no_mmap);
1988EXPORT_SYMBOL(sock_no_poll);
1989EXPORT_SYMBOL(sock_no_recvmsg);
1990EXPORT_SYMBOL(sock_no_sendmsg);
1991EXPORT_SYMBOL(sock_no_sendpage);
1992EXPORT_SYMBOL(sock_no_setsockopt);
1993EXPORT_SYMBOL(sock_no_shutdown);
1994EXPORT_SYMBOL(sock_no_socketpair);
1995EXPORT_SYMBOL(sock_rfree);
1996EXPORT_SYMBOL(sock_setsockopt);
1997EXPORT_SYMBOL(sock_wfree);
1998EXPORT_SYMBOL(sock_wmalloc);
1999EXPORT_SYMBOL(sock_i_uid);
2000EXPORT_SYMBOL(sock_i_ino);
1da177e4 2001EXPORT_SYMBOL(sysctl_optmem_max);
6baf1f41 2002#ifdef CONFIG_SYSCTL
1da177e4
LT		 2003EXPORT_SYMBOL(sysctl_rmem_max);
2004EXPORT_SYMBOL(sysctl_wmem_max);
2005#endif
Linux 6.x block layer and io_uring tree(s)