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radeonfb: Whack the PCI PM register until it sticks
[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 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
4fc268d2 92#include <linux/capability.h>
1da177e4
LT		 93#include <linux/errno.h>
94#include <linux/types.h>
95#include <linux/socket.h>
96#include <linux/in.h>
97#include <linux/kernel.h>
1da177e4
LT		 98#include <linux/module.h>
99#include <linux/proc_fs.h>
100#include <linux/seq_file.h>
101#include <linux/sched.h>
102#include <linux/timer.h>
103#include <linux/string.h>
104#include <linux/sockios.h>
105#include <linux/net.h>
106#include <linux/mm.h>
107#include <linux/slab.h>
108#include <linux/interrupt.h>
109#include <linux/poll.h>
110#include <linux/tcp.h>
111#include <linux/init.h>
a1f8e7f7 112#include <linux/highmem.h>
1da177e4
LT		 113
114#include <asm/uaccess.h>
115#include <asm/system.h>
116
117#include <linux/netdevice.h>
118#include <net/protocol.h>
119#include <linux/skbuff.h>
457c4cbc 120#include <net/net_namespace.h>
2e6599cb 121#include <net/request_sock.h>
1da177e4
LT		 122#include <net/sock.h>
123#include <net/xfrm.h>
124#include <linux/ipsec.h>
125
126#include <linux/filter.h>
127
128#ifdef CONFIG_INET
129#include <net/tcp.h>
130#endif
131
da21f24d
IM		 132/*
133 * Each address family might have different locking rules, so we have
134 * one slock key per address family:
135 */
a5b5bb9a
IM		 136static struct lock_class_key af_family_keys[AF_MAX];
137static struct lock_class_key af_family_slock_keys[AF_MAX];
138
a5b5bb9a
IM		 139/*
140 * Make lock validator output more readable. (we pre-construct these
141 * strings build-time, so that runtime initialization of socket
142 * locks is fast):
143 */
144static const char *af_family_key_strings[AF_MAX+1] = {
145 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
146 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
147 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
148 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
149 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
150 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
151 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
152 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
153 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 154 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 155 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154
RDC		 156 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
157 "sk_lock-AF_MAX"
a5b5bb9a
IM		 158};
159static const char *af_family_slock_key_strings[AF_MAX+1] = {
160 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
161 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
162 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
163 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
164 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
165 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
166 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
167 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" ,
168 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 169 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 170 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154
RDC		 171 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
172 "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" ,
b4942af6 184 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 185 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154
RDC		 186 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
187 "clock-AF_MAX"
443aef0e 188};
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 229 *timeo_p = 0;
50aab54f 230 if (warned < 10 && net_ratelimit()) {
ba78073e
VA		 231 warned++;
232 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
233 "tries to set negative timeout\n",
ba25f9dc 234 current->comm, task_pid_nr(current));
50aab54f 235 }
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
9ee6b7f1 272 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
f0088a50
DV		 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
3ab224be
HA		 285 if (!sk_rmem_schedule(sk, skb->truesize)) {
286 err = -ENOBUFS;
287 goto out;
288 }
289
f0088a50
DV		 290 skb->dev = NULL;
291 skb_set_owner_r(skb, sk);
49ad9599 292
f0088a50
DV		 293 /* Cache the SKB length before we tack it onto the receive
294 * queue. Once it is added it no longer belongs to us and
295 * may be freed by other threads of control pulling packets
296 * from the queue.
297 */
298 skb_len = skb->len;
299
300 skb_queue_tail(&sk->sk_receive_queue, skb);
301
302 if (!sock_flag(sk, SOCK_DEAD))
303 sk->sk_data_ready(sk, skb_len);
304out:
305 return err;
306}
307EXPORT_SYMBOL(sock_queue_rcv_skb);
308
58a5a7b9 309int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 310{
311 int rc = NET_RX_SUCCESS;
312
fda9ef5d 313 if (sk_filter(sk, skb))
f0088a50
DV		 314 goto discard_and_relse;
315
316 skb->dev = NULL;
317
58a5a7b9
ACM		 318 if (nested)
319 bh_lock_sock_nested(sk);
320 else
321 bh_lock_sock(sk);
a5b5bb9a
IM		 322 if (!sock_owned_by_user(sk)) {
323 /*
324 * trylock + unlock semantics:
325 */
326 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
327
c57943a1 328 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 329
330 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
331 } else
f0088a50
DV		 332 sk_add_backlog(sk, skb);
333 bh_unlock_sock(sk);
334out:
335 sock_put(sk);
336 return rc;
337discard_and_relse:
338 kfree_skb(skb);
339 goto out;
340}
341EXPORT_SYMBOL(sk_receive_skb);
342
343struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
344{
345 struct dst_entry *dst = sk->sk_dst_cache;
346
347 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
348 sk->sk_dst_cache = NULL;
349 dst_release(dst);
350 return NULL;
351 }
352
353 return dst;
354}
355EXPORT_SYMBOL(__sk_dst_check);
356
357struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
358{
359 struct dst_entry *dst = sk_dst_get(sk);
360
361 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
362 sk_dst_reset(sk);
363 dst_release(dst);
364 return NULL;
365 }
366
367 return dst;
368}
369EXPORT_SYMBOL(sk_dst_check);
370
4878809f
DM		 371static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
372{
373 int ret = -ENOPROTOOPT;
374#ifdef CONFIG_NETDEVICES
3b1e0a65 375 struct net *net = sock_net(sk);
4878809f
DM		 376 char devname[IFNAMSIZ];
377 int index;
378
379 /* Sorry... */
380 ret = -EPERM;
381 if (!capable(CAP_NET_RAW))
382 goto out;
383
384 ret = -EINVAL;
385 if (optlen < 0)
386 goto out;
387
388 /* Bind this socket to a particular device like "eth0",
389 * as specified in the passed interface name. If the
390 * name is "" or the option length is zero the socket
391 * is not bound.
392 */
393 if (optlen > IFNAMSIZ - 1)
394 optlen = IFNAMSIZ - 1;
395 memset(devname, 0, sizeof(devname));
396
397 ret = -EFAULT;
398 if (copy_from_user(devname, optval, optlen))
399 goto out;
400
401 if (devname[0] == '\0') {
402 index = 0;
403 } else {
881d966b 404 struct net_device *dev = dev_get_by_name(net, devname);
4878809f
DM		 405
406 ret = -ENODEV;
407 if (!dev)
408 goto out;
409
410 index = dev->ifindex;
411 dev_put(dev);
412 }
413
414 lock_sock(sk);
415 sk->sk_bound_dev_if = index;
416 sk_dst_reset(sk);
417 release_sock(sk);
418
419 ret = 0;
420
421out:
422#endif
423
424 return ret;
425}
426
c0ef877b
PE		 427static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
428{
429 if (valbool)
430 sock_set_flag(sk, bit);
431 else
432 sock_reset_flag(sk, bit);
433}
434
1da177e4
LT		 435/*
436 * This is meant for all protocols to use and covers goings on
437 * at the socket level. Everything here is generic.
438 */
439
440int sock_setsockopt(struct socket *sock, int level, int optname,
441 char __user *optval, int optlen)
442{
443 struct sock *sk=sock->sk;
1da177e4
LT		 444 int val;
445 int valbool;
446 struct linger ling;
447 int ret = 0;
4ec93edb 448
1da177e4
LT		 449 /*
450 * Options without arguments
451 */
452
4878809f
DM		 453 if (optname == SO_BINDTODEVICE)
454 return sock_bindtodevice(sk, optval, optlen);
455
e71a4783
SH		 456 if (optlen < sizeof(int))
457 return -EINVAL;
4ec93edb 458
1da177e4
LT		 459 if (get_user(val, (int __user *)optval))
460 return -EFAULT;
4ec93edb
YH		 461
462 valbool = val?1:0;
1da177e4
LT		 463
464 lock_sock(sk);
465
e71a4783
SH		 466 switch(optname) {
467 case SO_DEBUG:
468 if (val && !capable(CAP_NET_ADMIN)) {
469 ret = -EACCES;
c0ef877b
PE		 470 } else
471 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 472 break;
473 case SO_REUSEADDR:
474 sk->sk_reuse = valbool;
475 break;
476 case SO_TYPE:
477 case SO_ERROR:
478 ret = -ENOPROTOOPT;
479 break;
480 case SO_DONTROUTE:
c0ef877b 481 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 482 break;
483 case SO_BROADCAST:
484 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
485 break;
486 case SO_SNDBUF:
487 /* Don't error on this BSD doesn't and if you think
488 about it this is right. Otherwise apps have to
489 play 'guess the biggest size' games. RCVBUF/SNDBUF
490 are treated in BSD as hints */
491
492 if (val > sysctl_wmem_max)
493 val = sysctl_wmem_max;
b0573dea 494set_sndbuf:
e71a4783
SH		 495 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
496 if ((val * 2) < SOCK_MIN_SNDBUF)
497 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
498 else
499 sk->sk_sndbuf = val * 2;
1da177e4 500
e71a4783
SH		 501 /*
502 * Wake up sending tasks if we
503 * upped the value.
504 */
505 sk->sk_write_space(sk);
506 break;
1da177e4 507
e71a4783
SH		 508 case SO_SNDBUFFORCE:
509 if (!capable(CAP_NET_ADMIN)) {
510 ret = -EPERM;
511 break;
512 }
513 goto set_sndbuf;
b0573dea 514
e71a4783
SH		 515 case SO_RCVBUF:
516 /* Don't error on this BSD doesn't and if you think
517 about it this is right. Otherwise apps have to
518 play 'guess the biggest size' games. RCVBUF/SNDBUF
519 are treated in BSD as hints */
4ec93edb 520
e71a4783
SH		 521 if (val > sysctl_rmem_max)
522 val = sysctl_rmem_max;
b0573dea 523set_rcvbuf:
e71a4783
SH		 524 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
525 /*
526 * We double it on the way in to account for
527 * "struct sk_buff" etc. overhead. Applications
528 * assume that the SO_RCVBUF setting they make will
529 * allow that much actual data to be received on that
530 * socket.
531 *
532 * Applications are unaware that "struct sk_buff" and
533 * other overheads allocate from the receive buffer
534 * during socket buffer allocation.
535 *
536 * And after considering the possible alternatives,
537 * returning the value we actually used in getsockopt
538 * is the most desirable behavior.
539 */
540 if ((val * 2) < SOCK_MIN_RCVBUF)
541 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
542 else
543 sk->sk_rcvbuf = val * 2;
544 break;
545
546 case SO_RCVBUFFORCE:
547 if (!capable(CAP_NET_ADMIN)) {
548 ret = -EPERM;
1da177e4 549 break;
e71a4783
SH		 550 }
551 goto set_rcvbuf;
1da177e4 552
e71a4783 553 case SO_KEEPALIVE:
1da177e4 554#ifdef CONFIG_INET
e71a4783
SH		 555 if (sk->sk_protocol == IPPROTO_TCP)
556 tcp_set_keepalive(sk, valbool);
1da177e4 557#endif
e71a4783
SH		 558 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
559 break;
560
561 case SO_OOBINLINE:
562 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
563 break;
564
565 case SO_NO_CHECK:
566 sk->sk_no_check = valbool;
567 break;
568
569 case SO_PRIORITY:
570 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
571 sk->sk_priority = val;
572 else
573 ret = -EPERM;
574 break;
575
576 case SO_LINGER:
577 if (optlen < sizeof(ling)) {
578 ret = -EINVAL; /* 1003.1g */
1da177e4 579 break;
e71a4783
SH		 580 }
581 if (copy_from_user(&ling,optval,sizeof(ling))) {
582 ret = -EFAULT;
1da177e4 583 break;
e71a4783
SH		 584 }
585 if (!ling.l_onoff)
586 sock_reset_flag(sk, SOCK_LINGER);
587 else {
1da177e4 588#if (BITS_PER_LONG == 32)
e71a4783
SH		 589 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
590 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 591 else
e71a4783
SH		 592#endif
593 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
594 sock_set_flag(sk, SOCK_LINGER);
595 }
596 break;
597
598 case SO_BSDCOMPAT:
599 sock_warn_obsolete_bsdism("setsockopt");
600 break;
601
602 case SO_PASSCRED:
603 if (valbool)
604 set_bit(SOCK_PASSCRED, &sock->flags);
605 else
606 clear_bit(SOCK_PASSCRED, &sock->flags);
607 break;
608
609 case SO_TIMESTAMP:
92f37fd2 610 case SO_TIMESTAMPNS:
e71a4783 611 if (valbool) {
92f37fd2
ED		 612 if (optname == SO_TIMESTAMP)
613 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
614 else
615 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 616 sock_set_flag(sk, SOCK_RCVTSTAMP);
617 sock_enable_timestamp(sk);
92f37fd2 618 } else {
e71a4783 619 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 620 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
621 }
e71a4783
SH		 622 break;
623
624 case SO_RCVLOWAT:
625 if (val < 0)
626 val = INT_MAX;
627 sk->sk_rcvlowat = val ? : 1;
628 break;
629
630 case SO_RCVTIMEO:
631 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
632 break;
633
634 case SO_SNDTIMEO:
635 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
636 break;
1da177e4 637
e71a4783
SH		 638 case SO_ATTACH_FILTER:
639 ret = -EINVAL;
640 if (optlen == sizeof(struct sock_fprog)) {
641 struct sock_fprog fprog;
1da177e4 642
e71a4783
SH		 643 ret = -EFAULT;
644 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 645 break;
e71a4783
SH		 646
647 ret = sk_attach_filter(&fprog, sk);
648 }
649 break;
650
651 case SO_DETACH_FILTER:
55b33325 652 ret = sk_detach_filter(sk);
e71a4783 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;
4a19ec58
LAT		 661 case SO_MARK:
662 if (!capable(CAP_NET_ADMIN))
663 ret = -EPERM;
664 else {
665 sk->sk_mark = val;
666 }
667 break;
877ce7c1 668
1da177e4
LT		 669 /* We implement the SO_SNDLOWAT etc to
670 not be settable (1003.1g 5.3) */
e71a4783
SH		 671 default:
672 ret = -ENOPROTOOPT;
673 break;
4ec93edb 674 }
1da177e4
LT		 675 release_sock(sk);
676 return ret;
677}
678
679
680int sock_getsockopt(struct socket *sock, int level, int optname,
681 char __user *optval, int __user *optlen)
682{
683 struct sock *sk = sock->sk;
4ec93edb 684
e71a4783 685 union {
4ec93edb
YH		 686 int val;
687 struct linger ling;
1da177e4
LT		 688 struct timeval tm;
689 } v;
4ec93edb 690
1da177e4
LT		 691 unsigned int lv = sizeof(int);
692 int len;
4ec93edb 693
e71a4783 694 if (get_user(len, optlen))
4ec93edb 695 return -EFAULT;
e71a4783 696 if (len < 0)
1da177e4 697 return -EINVAL;
4ec93edb 698
50fee1de 699 memset(&v, 0, sizeof(v));
df0bca04 700
e71a4783
SH		 701 switch(optname) {
702 case SO_DEBUG:
703 v.val = sock_flag(sk, SOCK_DBG);
704 break;
705
706 case SO_DONTROUTE:
707 v.val = sock_flag(sk, SOCK_LOCALROUTE);
708 break;
709
710 case SO_BROADCAST:
711 v.val = !!sock_flag(sk, SOCK_BROADCAST);
712 break;
713
714 case SO_SNDBUF:
715 v.val = sk->sk_sndbuf;
716 break;
717
718 case SO_RCVBUF:
719 v.val = sk->sk_rcvbuf;
720 break;
721
722 case SO_REUSEADDR:
723 v.val = sk->sk_reuse;
724 break;
725
726 case SO_KEEPALIVE:
727 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
728 break;
729
730 case SO_TYPE:
731 v.val = sk->sk_type;
732 break;
733
734 case SO_ERROR:
735 v.val = -sock_error(sk);
736 if (v.val==0)
737 v.val = xchg(&sk->sk_err_soft, 0);
738 break;
739
740 case SO_OOBINLINE:
741 v.val = !!sock_flag(sk, SOCK_URGINLINE);
742 break;
743
744 case SO_NO_CHECK:
745 v.val = sk->sk_no_check;
746 break;
747
748 case SO_PRIORITY:
749 v.val = sk->sk_priority;
750 break;
751
752 case SO_LINGER:
753 lv = sizeof(v.ling);
754 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
755 v.ling.l_linger = sk->sk_lingertime / HZ;
756 break;
757
758 case SO_BSDCOMPAT:
759 sock_warn_obsolete_bsdism("getsockopt");
760 break;
761
762 case SO_TIMESTAMP:
92f37fd2
ED		 763 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
764 !sock_flag(sk, SOCK_RCVTSTAMPNS);
765 break;
766
767 case SO_TIMESTAMPNS:
768 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 769 break;
770
771 case SO_RCVTIMEO:
772 lv=sizeof(struct timeval);
773 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
774 v.tm.tv_sec = 0;
775 v.tm.tv_usec = 0;
776 } else {
777 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
778 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
779 }
780 break;
781
782 case SO_SNDTIMEO:
783 lv=sizeof(struct timeval);
784 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
785 v.tm.tv_sec = 0;
786 v.tm.tv_usec = 0;
787 } else {
788 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
789 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
790 }
791 break;
1da177e4 792
e71a4783
SH		 793 case SO_RCVLOWAT:
794 v.val = sk->sk_rcvlowat;
795 break;
1da177e4 796
e71a4783
SH		 797 case SO_SNDLOWAT:
798 v.val=1;
799 break;
1da177e4 800
e71a4783
SH		 801 case SO_PASSCRED:
802 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
803 break;
1da177e4 804
e71a4783
SH		 805 case SO_PEERCRED:
806 if (len > sizeof(sk->sk_peercred))
807 len = sizeof(sk->sk_peercred);
808 if (copy_to_user(optval, &sk->sk_peercred, len))
809 return -EFAULT;
810 goto lenout;
1da177e4 811
e71a4783
SH		 812 case SO_PEERNAME:
813 {
814 char address[128];
815
816 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
817 return -ENOTCONN;
818 if (lv < len)
819 return -EINVAL;
820 if (copy_to_user(optval, address, len))
821 return -EFAULT;
822 goto lenout;
823 }
1da177e4 824
e71a4783
SH		 825 /* Dubious BSD thing... Probably nobody even uses it, but
826 * the UNIX standard wants it for whatever reason... -DaveM
827 */
828 case SO_ACCEPTCONN:
829 v.val = sk->sk_state == TCP_LISTEN;
830 break;
1da177e4 831
e71a4783
SH		 832 case SO_PASSSEC:
833 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
834 break;
877ce7c1 835
e71a4783
SH		 836 case SO_PEERSEC:
837 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 838
4a19ec58
LAT		 839 case SO_MARK:
840 v.val = sk->sk_mark;
841 break;
842
e71a4783
SH		 843 default:
844 return -ENOPROTOOPT;
1da177e4 845 }
e71a4783 846
1da177e4
LT		 847 if (len > lv)
848 len = lv;
849 if (copy_to_user(optval, &v, len))
850 return -EFAULT;
851lenout:
4ec93edb
YH		 852 if (put_user(len, optlen))
853 return -EFAULT;
854 return 0;
1da177e4
LT		 855}
856
a5b5bb9a
IM		 857/*
858 * Initialize an sk_lock.
859 *
860 * (We also register the sk_lock with the lock validator.)
861 */
b6f99a21 862static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 863{
ed07536e
PZ		 864 sock_lock_init_class_and_name(sk,
865 af_family_slock_key_strings[sk->sk_family],
866 af_family_slock_keys + sk->sk_family,
867 af_family_key_strings[sk->sk_family],
868 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 869}
870
f1a6c4da
PE		 871static void sock_copy(struct sock *nsk, const struct sock *osk)
872{
873#ifdef CONFIG_SECURITY_NETWORK
874 void *sptr = nsk->sk_security;
875#endif
876
877 memcpy(nsk, osk, osk->sk_prot->obj_size);
f1a6c4da
PE		 878#ifdef CONFIG_SECURITY_NETWORK
879 nsk->sk_security = sptr;
880 security_sk_clone(osk, nsk);
881#endif
882}
883
2e4afe7b
PE		 884static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
885 int family)
c308c1b2
PE		 886{
887 struct sock *sk;
888 struct kmem_cache *slab;
889
890 slab = prot->slab;
891 if (slab != NULL)
892 sk = kmem_cache_alloc(slab, priority);
893 else
894 sk = kmalloc(prot->obj_size, priority);
895
2e4afe7b
PE		 896 if (sk != NULL) {
897 if (security_sk_alloc(sk, family, priority))
898 goto out_free;
899
900 if (!try_module_get(prot->owner))
901 goto out_free_sec;
902 }
903
c308c1b2 904 return sk;
2e4afe7b
PE		 905
906out_free_sec:
907 security_sk_free(sk);
908out_free:
909 if (slab != NULL)
910 kmem_cache_free(slab, sk);
911 else
912 kfree(sk);
913 return NULL;
c308c1b2
PE		 914}
915
916static void sk_prot_free(struct proto *prot, struct sock *sk)
917{
918 struct kmem_cache *slab;
2e4afe7b 919 struct module *owner;
c308c1b2 920
2e4afe7b 921 owner = prot->owner;
c308c1b2 922 slab = prot->slab;
2e4afe7b
PE		 923
924 security_sk_free(sk);
c308c1b2
PE		 925 if (slab != NULL)
926 kmem_cache_free(slab, sk);
927 else
928 kfree(sk);
2e4afe7b 929 module_put(owner);
c308c1b2
PE		 930}
931
1da177e4
LT		 932/**
933 * sk_alloc - All socket objects are allocated here
c4ea43c5 934 * @net: the applicable net namespace
4dc3b16b
PP		 935 * @family: protocol family
936 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
937 * @prot: struct proto associated with this new sock instance
1da177e4 938 */
1b8d7ae4 939struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 940 struct proto *prot)
1da177e4 941{
c308c1b2 942 struct sock *sk;
1da177e4 943
154adbc8 944 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 945 if (sk) {
154adbc8
PE		 946 sk->sk_family = family;
947 /*
948 * See comment in struct sock definition to understand
949 * why we need sk_prot_creator -acme
950 */
951 sk->sk_prot = sk->sk_prot_creator = prot;
952 sock_lock_init(sk);
3b1e0a65 953 sock_net_set(sk, get_net(net));
1da177e4 954 }
a79af59e 955
2e4afe7b 956 return sk;
1da177e4
LT		 957}
958
959void sk_free(struct sock *sk)
960{
961 struct sk_filter *filter;
1da177e4
LT		 962
963 if (sk->sk_destruct)
964 sk->sk_destruct(sk);
965
fda9ef5d 966 filter = rcu_dereference(sk->sk_filter);
1da177e4 967 if (filter) {
309dd5fc 968 sk_filter_uncharge(sk, filter);
fda9ef5d 969 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 970 }
971
972 sock_disable_timestamp(sk);
973
974 if (atomic_read(&sk->sk_omem_alloc))
975 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 976 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 977
3b1e0a65 978 put_net(sock_net(sk));
c308c1b2 979 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4
LT		 980}
981
edf02087
DL		 982/*
983 * Last sock_put should drop referrence to sk->sk_net. It has already
984 * been dropped in sk_change_net. Taking referrence to stopping namespace
985 * is not an option.
986 * Take referrence to a socket to remove it from hash _alive_ and after that
987 * destroy it in the context of init_net.
988 */
989void sk_release_kernel(struct sock *sk)
990{
991 if (sk == NULL || sk->sk_socket == NULL)
992 return;
993
994 sock_hold(sk);
995 sock_release(sk->sk_socket);
65a18ec5 996 release_net(sock_net(sk));
3b1e0a65 997 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 998 sock_put(sk);
999}
45af1754 1000EXPORT_SYMBOL(sk_release_kernel);
edf02087 1001
dd0fc66f 1002struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1003{
8fd1d178 1004 struct sock *newsk;
87d11ceb 1005
8fd1d178 1006 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1007 if (newsk != NULL) {
1008 struct sk_filter *filter;
1009
892c141e 1010 sock_copy(newsk, sk);
87d11ceb
ACM		 1011
1012 /* SANITY */
3b1e0a65 1013 get_net(sock_net(newsk));
87d11ceb
ACM		 1014 sk_node_init(&newsk->sk_node);
1015 sock_lock_init(newsk);
1016 bh_lock_sock(newsk);
fa438ccf 1017 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
87d11ceb
ACM		 1018
1019 atomic_set(&newsk->sk_rmem_alloc, 0);
1020 atomic_set(&newsk->sk_wmem_alloc, 0);
1021 atomic_set(&newsk->sk_omem_alloc, 0);
1022 skb_queue_head_init(&newsk->sk_receive_queue);
1023 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1024#ifdef CONFIG_NET_DMA
1025 skb_queue_head_init(&newsk->sk_async_wait_queue);
1026#endif
87d11ceb
ACM		 1027
1028 rwlock_init(&newsk->sk_dst_lock);
1029 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1030 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1031 af_callback_keys + newsk->sk_family,
1032 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1033
1034 newsk->sk_dst_cache = NULL;
1035 newsk->sk_wmem_queued = 0;
1036 newsk->sk_forward_alloc = 0;
1037 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1038 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1039
1040 sock_reset_flag(newsk, SOCK_DONE);
1041 skb_queue_head_init(&newsk->sk_error_queue);
1042
1043 filter = newsk->sk_filter;
1044 if (filter != NULL)
1045 sk_filter_charge(newsk, filter);
1046
1047 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1048 /* It is still raw copy of parent, so invalidate
1049 * destructor and make plain sk_free() */
1050 newsk->sk_destruct = NULL;
1051 sk_free(newsk);
1052 newsk = NULL;
1053 goto out;
1054 }
1055
1056 newsk->sk_err = 0;
1057 newsk->sk_priority = 0;
1058 atomic_set(&newsk->sk_refcnt, 2);
1059
1060 /*
1061 * Increment the counter in the same struct proto as the master
1062 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1063 * is the same as sk->sk_prot->socks, as this field was copied
1064 * with memcpy).
1065 *
1066 * This _changes_ the previous behaviour, where
1067 * tcp_create_openreq_child always was incrementing the
1068 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1069 * to be taken into account in all callers. -acme
1070 */
1071 sk_refcnt_debug_inc(newsk);
972692e0 1072 sk_set_socket(newsk, NULL);
87d11ceb
ACM		 1073 newsk->sk_sleep = NULL;
1074
1075 if (newsk->sk_prot->sockets_allocated)
1748376b 1076 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
87d11ceb
ACM		 1077 }
1078out:
1079 return newsk;
1080}
1081
1082EXPORT_SYMBOL_GPL(sk_clone);
1083
9958089a
AK		 1084void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1085{
1086 __sk_dst_set(sk, dst);
1087 sk->sk_route_caps = dst->dev->features;
1088 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1089 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
9958089a 1090 if (sk_can_gso(sk)) {
82cc1a7a 1091 if (dst->header_len) {
9958089a 1092 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1093 } else {
9958089a 1094 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1095 sk->sk_gso_max_size = dst->dev->gso_max_size;
1096 }
9958089a
AK		 1097 }
1098}
1099EXPORT_SYMBOL_GPL(sk_setup_caps);
1100
1da177e4
LT		 1101void __init sk_init(void)
1102{
1103 if (num_physpages <= 4096) {
1104 sysctl_wmem_max = 32767;
1105 sysctl_rmem_max = 32767;
1106 sysctl_wmem_default = 32767;
1107 sysctl_rmem_default = 32767;
1108 } else if (num_physpages >= 131072) {
1109 sysctl_wmem_max = 131071;
1110 sysctl_rmem_max = 131071;
1111 }
1112}
1113
1114/*
1115 * Simple resource managers for sockets.
1116 */
1117
1118
4ec93edb
YH		 1119/*
1120 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1121 */
1122void sock_wfree(struct sk_buff *skb)
1123{
1124 struct sock *sk = skb->sk;
1125
1126 /* In case it might be waiting for more memory. */
1127 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1128 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1129 sk->sk_write_space(sk);
1130 sock_put(sk);
1131}
1132
4ec93edb
YH		 1133/*
1134 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1135 */
1136void sock_rfree(struct sk_buff *skb)
1137{
1138 struct sock *sk = skb->sk;
1139
1140 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1141 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4
LT		 1142}
1143
1144
1145int sock_i_uid(struct sock *sk)
1146{
1147 int uid;
1148
1149 read_lock(&sk->sk_callback_lock);
1150 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1151 read_unlock(&sk->sk_callback_lock);
1152 return uid;
1153}
1154
1155unsigned long sock_i_ino(struct sock *sk)
1156{
1157 unsigned long ino;
1158
1159 read_lock(&sk->sk_callback_lock);
1160 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1161 read_unlock(&sk->sk_callback_lock);
1162 return ino;
1163}
1164
1165/*
1166 * Allocate a skb from the socket's send buffer.
1167 */
86a76caf 1168struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1169 gfp_t priority)
1da177e4
LT		 1170{
1171 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1172 struct sk_buff * skb = alloc_skb(size, priority);
1173 if (skb) {
1174 skb_set_owner_w(skb, sk);
1175 return skb;
1176 }
1177 }
1178 return NULL;
1179}
1180
1181/*
1182 * Allocate a skb from the socket's receive buffer.
4ec93edb 1183 */
86a76caf 1184struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1185 gfp_t priority)
1da177e4
LT		 1186{
1187 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1188 struct sk_buff *skb = alloc_skb(size, priority);
1189 if (skb) {
1190 skb_set_owner_r(skb, sk);
1191 return skb;
1192 }
1193 }
1194 return NULL;
1195}
1196
4ec93edb 1197/*
1da177e4 1198 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1199 */
dd0fc66f 1200void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1201{
1202 if ((unsigned)size <= sysctl_optmem_max &&
1203 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1204 void *mem;
1205 /* First do the add, to avoid the race if kmalloc
4ec93edb 1206 * might sleep.
1da177e4
LT		 1207 */
1208 atomic_add(size, &sk->sk_omem_alloc);
1209 mem = kmalloc(size, priority);
1210 if (mem)
1211 return mem;
1212 atomic_sub(size, &sk->sk_omem_alloc);
1213 }
1214 return NULL;
1215}
1216
1217/*
1218 * Free an option memory block.
1219 */
1220void sock_kfree_s(struct sock *sk, void *mem, int size)
1221{
1222 kfree(mem);
1223 atomic_sub(size, &sk->sk_omem_alloc);
1224}
1225
1226/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1227 I think, these locks should be removed for datagram sockets.
1228 */
1229static long sock_wait_for_wmem(struct sock * sk, long timeo)
1230{
1231 DEFINE_WAIT(wait);
1232
1233 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1234 for (;;) {
1235 if (!timeo)
1236 break;
1237 if (signal_pending(current))
1238 break;
1239 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1240 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1241 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1242 break;
1243 if (sk->sk_shutdown & SEND_SHUTDOWN)
1244 break;
1245 if (sk->sk_err)
1246 break;
1247 timeo = schedule_timeout(timeo);
1248 }
1249 finish_wait(sk->sk_sleep, &wait);
1250 return timeo;
1251}
1252
1253
1254/*
1255 * Generic send/receive buffer handlers
1256 */
1257
1258static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1259 unsigned long header_len,
1260 unsigned long data_len,
1261 int noblock, int *errcode)
1262{
1263 struct sk_buff *skb;
7d877f3b 1264 gfp_t gfp_mask;
1da177e4
LT		 1265 long timeo;
1266 int err;
1267
1268 gfp_mask = sk->sk_allocation;
1269 if (gfp_mask & __GFP_WAIT)
1270 gfp_mask |= __GFP_REPEAT;
1271
1272 timeo = sock_sndtimeo(sk, noblock);
1273 while (1) {
1274 err = sock_error(sk);
1275 if (err != 0)
1276 goto failure;
1277
1278 err = -EPIPE;
1279 if (sk->sk_shutdown & SEND_SHUTDOWN)
1280 goto failure;
1281
1282 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1283 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1284 if (skb) {
1285 int npages;
1286 int i;
1287
1288 /* No pages, we're done... */
1289 if (!data_len)
1290 break;
1291
1292 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1293 skb->truesize += data_len;
1294 skb_shinfo(skb)->nr_frags = npages;
1295 for (i = 0; i < npages; i++) {
1296 struct page *page;
1297 skb_frag_t *frag;
1298
1299 page = alloc_pages(sk->sk_allocation, 0);
1300 if (!page) {
1301 err = -ENOBUFS;
1302 skb_shinfo(skb)->nr_frags = i;
1303 kfree_skb(skb);
1304 goto failure;
1305 }
1306
1307 frag = &skb_shinfo(skb)->frags[i];
1308 frag->page = page;
1309 frag->page_offset = 0;
1310 frag->size = (data_len >= PAGE_SIZE ?
1311 PAGE_SIZE :
1312 data_len);
1313 data_len -= PAGE_SIZE;
1314 }
1315
1316 /* Full success... */
1317 break;
1318 }
1319 err = -ENOBUFS;
1320 goto failure;
1321 }
1322 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1323 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1324 err = -EAGAIN;
1325 if (!timeo)
1326 goto failure;
1327 if (signal_pending(current))
1328 goto interrupted;
1329 timeo = sock_wait_for_wmem(sk, timeo);
1330 }
1331
1332 skb_set_owner_w(skb, sk);
1333 return skb;
1334
1335interrupted:
1336 err = sock_intr_errno(timeo);
1337failure:
1338 *errcode = err;
1339 return NULL;
1340}
1341
4ec93edb 1342struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1343 int noblock, int *errcode)
1344{
1345 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1346}
1347
1348static void __lock_sock(struct sock *sk)
1349{
1350 DEFINE_WAIT(wait);
1351
e71a4783 1352 for (;;) {
1da177e4
LT		 1353 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1354 TASK_UNINTERRUPTIBLE);
1355 spin_unlock_bh(&sk->sk_lock.slock);
1356 schedule();
1357 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1358 if (!sock_owned_by_user(sk))
1da177e4
LT		 1359 break;
1360 }
1361 finish_wait(&sk->sk_lock.wq, &wait);
1362}
1363
1364static void __release_sock(struct sock *sk)
1365{
1366 struct sk_buff *skb = sk->sk_backlog.head;
1367
1368 do {
1369 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1370 bh_unlock_sock(sk);
1371
1372 do {
1373 struct sk_buff *next = skb->next;
1374
1375 skb->next = NULL;
c57943a1 1376 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1377
1378 /*
1379 * We are in process context here with softirqs
1380 * disabled, use cond_resched_softirq() to preempt.
1381 * This is safe to do because we've taken the backlog
1382 * queue private:
1383 */
1384 cond_resched_softirq();
1385
1386 skb = next;
1387 } while (skb != NULL);
1388
1389 bh_lock_sock(sk);
e71a4783 1390 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1391}
1392
1393/**
1394 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1395 * @sk: sock to wait on
1396 * @timeo: for how long
1da177e4
LT		 1397 *
1398 * Now socket state including sk->sk_err is changed only under lock,
1399 * hence we may omit checks after joining wait queue.
1400 * We check receive queue before schedule() only as optimization;
1401 * it is very likely that release_sock() added new data.
1402 */
1403int sk_wait_data(struct sock *sk, long *timeo)
1404{
1405 int rc;
1406 DEFINE_WAIT(wait);
1407
1408 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1409 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1410 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1411 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1412 finish_wait(sk->sk_sleep, &wait);
1413 return rc;
1414}
1415
1416EXPORT_SYMBOL(sk_wait_data);
1417
3ab224be
HA		 1418/**
1419 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1420 * @sk: socket
1421 * @size: memory size to allocate
1422 * @kind: allocation type
1423 *
1424 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1425 * rmem allocation. This function assumes that protocols which have
1426 * memory_pressure use sk_wmem_queued as write buffer accounting.
1427 */
1428int __sk_mem_schedule(struct sock *sk, int size, int kind)
1429{
1430 struct proto *prot = sk->sk_prot;
1431 int amt = sk_mem_pages(size);
1432 int allocated;
1433
1434 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1435 allocated = atomic_add_return(amt, prot->memory_allocated);
1436
1437 /* Under limit. */
1438 if (allocated <= prot->sysctl_mem[0]) {
1439 if (prot->memory_pressure && *prot->memory_pressure)
1440 *prot->memory_pressure = 0;
1441 return 1;
1442 }
1443
1444 /* Under pressure. */
1445 if (allocated > prot->sysctl_mem[1])
1446 if (prot->enter_memory_pressure)
5c52ba17 1447 prot->enter_memory_pressure(sk);
3ab224be
HA		 1448
1449 /* Over hard limit. */
1450 if (allocated > prot->sysctl_mem[2])
1451 goto suppress_allocation;
1452
1453 /* guarantee minimum buffer size under pressure */
1454 if (kind == SK_MEM_RECV) {
1455 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1456 return 1;
1457 } else { /* SK_MEM_SEND */
1458 if (sk->sk_type == SOCK_STREAM) {
1459 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1460 return 1;
1461 } else if (atomic_read(&sk->sk_wmem_alloc) <
1462 prot->sysctl_wmem[0])
1463 return 1;
1464 }
1465
1466 if (prot->memory_pressure) {
1748376b
ED		 1467 int alloc;
1468
1469 if (!*prot->memory_pressure)
1470 return 1;
1471 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1472 if (prot->sysctl_mem[2] > alloc *
3ab224be
HA		 1473 sk_mem_pages(sk->sk_wmem_queued +
1474 atomic_read(&sk->sk_rmem_alloc) +
1475 sk->sk_forward_alloc))
1476 return 1;
1477 }
1478
1479suppress_allocation:
1480
1481 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1482 sk_stream_moderate_sndbuf(sk);
1483
1484 /* Fail only if socket is _under_ its sndbuf.
1485 * In this case we cannot block, so that we have to fail.
1486 */
1487 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1488 return 1;
1489 }
1490
1491 /* Alas. Undo changes. */
1492 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1493 atomic_sub(amt, prot->memory_allocated);
1494 return 0;
1495}
1496
1497EXPORT_SYMBOL(__sk_mem_schedule);
1498
1499/**
1500 * __sk_reclaim - reclaim memory_allocated
1501 * @sk: socket
1502 */
1503void __sk_mem_reclaim(struct sock *sk)
1504{
1505 struct proto *prot = sk->sk_prot;
1506
680a5a50 1507 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1508 prot->memory_allocated);
1509 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1510
1511 if (prot->memory_pressure && *prot->memory_pressure &&
1512 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1513 *prot->memory_pressure = 0;
1514}
1515
1516EXPORT_SYMBOL(__sk_mem_reclaim);
1517
1518
1da177e4
LT		 1519/*
1520 * Set of default routines for initialising struct proto_ops when
1521 * the protocol does not support a particular function. In certain
1522 * cases where it makes no sense for a protocol to have a "do nothing"
1523 * function, some default processing is provided.
1524 */
1525
1526int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1527{
1528 return -EOPNOTSUPP;
1529}
1530
4ec93edb 1531int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1532 int len, int flags)
1533{
1534 return -EOPNOTSUPP;
1535}
1536
1537int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1538{
1539 return -EOPNOTSUPP;
1540}
1541
1542int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1543{
1544 return -EOPNOTSUPP;
1545}
1546
4ec93edb 1547int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1548 int *len, int peer)
1549{
1550 return -EOPNOTSUPP;
1551}
1552
1553unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1554{
1555 return 0;
1556}
1557
1558int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1559{
1560 return -EOPNOTSUPP;
1561}
1562
1563int sock_no_listen(struct socket *sock, int backlog)
1564{
1565 return -EOPNOTSUPP;
1566}
1567
1568int sock_no_shutdown(struct socket *sock, int how)
1569{
1570 return -EOPNOTSUPP;
1571}
1572
1573int sock_no_setsockopt(struct socket *sock, int level, int optname,
1574 char __user *optval, int optlen)
1575{
1576 return -EOPNOTSUPP;
1577}
1578
1579int sock_no_getsockopt(struct socket *sock, int level, int optname,
1580 char __user *optval, int __user *optlen)
1581{
1582 return -EOPNOTSUPP;
1583}
1584
1585int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1586 size_t len)
1587{
1588 return -EOPNOTSUPP;
1589}
1590
1591int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1592 size_t len, int flags)
1593{
1594 return -EOPNOTSUPP;
1595}
1596
1597int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1598{
1599 /* Mirror missing mmap method error code */
1600 return -ENODEV;
1601}
1602
1603ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1604{
1605 ssize_t res;
1606 struct msghdr msg = {.msg_flags = flags};
1607 struct kvec iov;
1608 char *kaddr = kmap(page);
1609 iov.iov_base = kaddr + offset;
1610 iov.iov_len = size;
1611 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1612 kunmap(page);
1613 return res;
1614}
1615
1616/*
1617 * Default Socket Callbacks
1618 */
1619
1620static void sock_def_wakeup(struct sock *sk)
1621{
1622 read_lock(&sk->sk_callback_lock);
1623 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1624 wake_up_interruptible_all(sk->sk_sleep);
1625 read_unlock(&sk->sk_callback_lock);
1626}
1627
1628static void sock_def_error_report(struct sock *sk)
1629{
1630 read_lock(&sk->sk_callback_lock);
1631 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1632 wake_up_interruptible(sk->sk_sleep);
8d8ad9d7 1633 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1da177e4
LT		 1634 read_unlock(&sk->sk_callback_lock);
1635}
1636
1637static void sock_def_readable(struct sock *sk, int len)
1638{
1639 read_lock(&sk->sk_callback_lock);
1640 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
6f3d0929 1641 wake_up_interruptible_sync(sk->sk_sleep);
8d8ad9d7 1642 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1da177e4
LT		 1643 read_unlock(&sk->sk_callback_lock);
1644}
1645
1646static void sock_def_write_space(struct sock *sk)
1647{
1648 read_lock(&sk->sk_callback_lock);
1649
1650 /* Do not wake up a writer until he can make "significant"
1651 * progress. --DaveM
1652 */
e71a4783 1653 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1da177e4 1654 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
6f3d0929 1655 wake_up_interruptible_sync(sk->sk_sleep);
1da177e4
LT		 1656
1657 /* Should agree with poll, otherwise some programs break */
1658 if (sock_writeable(sk))
8d8ad9d7 1659 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1660 }
1661
1662 read_unlock(&sk->sk_callback_lock);
1663}
1664
1665static void sock_def_destruct(struct sock *sk)
1666{
a51482bd 1667 kfree(sk->sk_protinfo);
1da177e4
LT		 1668}
1669
1670void sk_send_sigurg(struct sock *sk)
1671{
1672 if (sk->sk_socket && sk->sk_socket->file)
1673 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1674 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4
LT		 1675}
1676
1677void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1678 unsigned long expires)
1679{
1680 if (!mod_timer(timer, expires))
1681 sock_hold(sk);
1682}
1683
1684EXPORT_SYMBOL(sk_reset_timer);
1685
1686void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1687{
1688 if (timer_pending(timer) && del_timer(timer))
1689 __sock_put(sk);
1690}
1691
1692EXPORT_SYMBOL(sk_stop_timer);
1693
1694void sock_init_data(struct socket *sock, struct sock *sk)
1695{
1696 skb_queue_head_init(&sk->sk_receive_queue);
1697 skb_queue_head_init(&sk->sk_write_queue);
1698 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1699#ifdef CONFIG_NET_DMA
1700 skb_queue_head_init(&sk->sk_async_wait_queue);
1701#endif
1da177e4
LT		 1702
1703 sk->sk_send_head = NULL;
1704
1705 init_timer(&sk->sk_timer);
4ec93edb 1706
1da177e4
LT		 1707 sk->sk_allocation = GFP_KERNEL;
1708 sk->sk_rcvbuf = sysctl_rmem_default;
1709 sk->sk_sndbuf = sysctl_wmem_default;
1710 sk->sk_state = TCP_CLOSE;
972692e0 1711 sk_set_socket(sk, sock);
1da177e4
LT		 1712
1713 sock_set_flag(sk, SOCK_ZAPPED);
1714
e71a4783 1715 if (sock) {
1da177e4
LT		 1716 sk->sk_type = sock->type;
1717 sk->sk_sleep = &sock->wait;
1718 sock->sk = sk;
1719 } else
1720 sk->sk_sleep = NULL;
1721
1722 rwlock_init(&sk->sk_dst_lock);
1723 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1724 lockdep_set_class_and_name(&sk->sk_callback_lock,
1725 af_callback_keys + sk->sk_family,
1726 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1727
1728 sk->sk_state_change = sock_def_wakeup;
1729 sk->sk_data_ready = sock_def_readable;
1730 sk->sk_write_space = sock_def_write_space;
1731 sk->sk_error_report = sock_def_error_report;
1732 sk->sk_destruct = sock_def_destruct;
1733
1734 sk->sk_sndmsg_page = NULL;
1735 sk->sk_sndmsg_off = 0;
1736
1737 sk->sk_peercred.pid = 0;
1738 sk->sk_peercred.uid = -1;
1739 sk->sk_peercred.gid = -1;
1740 sk->sk_write_pending = 0;
1741 sk->sk_rcvlowat = 1;
1742 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1743 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1744
f37f0afb 1745 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4
LT		 1746
1747 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1748 atomic_set(&sk->sk_drops, 0);
1da177e4
LT		 1749}
1750
b5606c2d 1751void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1752{
1753 might_sleep();
a5b5bb9a 1754 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1755 if (sk->sk_lock.owned)
1da177e4 1756 __lock_sock(sk);
d2e9117c 1757 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1758 spin_unlock(&sk->sk_lock.slock);
1759 /*
1760 * The sk_lock has mutex_lock() semantics here:
1761 */
fcc70d5f 1762 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1763 local_bh_enable();
1da177e4
LT		 1764}
1765
fcc70d5f 1766EXPORT_SYMBOL(lock_sock_nested);
1da177e4 1767
b5606c2d 1768void release_sock(struct sock *sk)
1da177e4 1769{
a5b5bb9a
IM		 1770 /*
1771 * The sk_lock has mutex_unlock() semantics:
1772 */
1773 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1774
1775 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1776 if (sk->sk_backlog.tail)
1777 __release_sock(sk);
d2e9117c 1778 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1779 if (waitqueue_active(&sk->sk_lock.wq))
1780 wake_up(&sk->sk_lock.wq);
1781 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1782}
1783EXPORT_SYMBOL(release_sock);
1784
1785int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1786{
b7aa0bf7 1787 struct timeval tv;
1da177e4
LT		 1788 if (!sock_flag(sk, SOCK_TIMESTAMP))
1789 sock_enable_timestamp(sk);
b7aa0bf7
ED		 1790 tv = ktime_to_timeval(sk->sk_stamp);
1791 if (tv.tv_sec == -1)
1da177e4 1792 return -ENOENT;
b7aa0bf7
ED		 1793 if (tv.tv_sec == 0) {
1794 sk->sk_stamp = ktime_get_real();
1795 tv = ktime_to_timeval(sk->sk_stamp);
1796 }
1797 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1798}
1da177e4
LT		 1799EXPORT_SYMBOL(sock_get_timestamp);
1800
ae40eb1e
ED		 1801int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1802{
1803 struct timespec ts;
1804 if (!sock_flag(sk, SOCK_TIMESTAMP))
1805 sock_enable_timestamp(sk);
1806 ts = ktime_to_timespec(sk->sk_stamp);
1807 if (ts.tv_sec == -1)
1808 return -ENOENT;
1809 if (ts.tv_sec == 0) {
1810 sk->sk_stamp = ktime_get_real();
1811 ts = ktime_to_timespec(sk->sk_stamp);
1812 }
1813 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1814}
1815EXPORT_SYMBOL(sock_get_timestampns);
1816
1da177e4 1817void sock_enable_timestamp(struct sock *sk)
4ec93edb
YH		 1818{
1819 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 1820 sock_set_flag(sk, SOCK_TIMESTAMP);
1821 net_enable_timestamp();
1822 }
1823}
1da177e4
LT		 1824
1825/*
1826 * Get a socket option on an socket.
1827 *
1828 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1829 * asynchronous errors should be reported by getsockopt. We assume
1830 * this means if you specify SO_ERROR (otherwise whats the point of it).
1831 */
1832int sock_common_getsockopt(struct socket *sock, int level, int optname,
1833 char __user *optval, int __user *optlen)
1834{
1835 struct sock *sk = sock->sk;
1836
1837 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1838}
1839
1840EXPORT_SYMBOL(sock_common_getsockopt);
1841
3fdadf7d 1842#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1843int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1844 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1845{
1846 struct sock *sk = sock->sk;
1847
1e51f951 1848 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 1849 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1850 optval, optlen);
3fdadf7d
DM		 1851 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1852}
1853EXPORT_SYMBOL(compat_sock_common_getsockopt);
1854#endif
1855
1da177e4
LT		 1856int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1857 struct msghdr *msg, size_t size, int flags)
1858{
1859 struct sock *sk = sock->sk;
1860 int addr_len = 0;
1861 int err;
1862
1863 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1864 flags & ~MSG_DONTWAIT, &addr_len);
1865 if (err >= 0)
1866 msg->msg_namelen = addr_len;
1867 return err;
1868}
1869
1870EXPORT_SYMBOL(sock_common_recvmsg);
1871
1872/*
1873 * Set socket options on an inet socket.
1874 */
1875int sock_common_setsockopt(struct socket *sock, int level, int optname,
1876 char __user *optval, int optlen)
1877{
1878 struct sock *sk = sock->sk;
1879
1880 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1881}
1882
1883EXPORT_SYMBOL(sock_common_setsockopt);
1884
3fdadf7d 1885#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1886int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1887 char __user *optval, int optlen)
3fdadf7d
DM		 1888{
1889 struct sock *sk = sock->sk;
1890
543d9cfe
ACM		 1891 if (sk->sk_prot->compat_setsockopt != NULL)
1892 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1893 optval, optlen);
3fdadf7d
DM		 1894 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1895}
1896EXPORT_SYMBOL(compat_sock_common_setsockopt);
1897#endif
1898
1da177e4
LT		 1899void sk_common_release(struct sock *sk)
1900{
1901 if (sk->sk_prot->destroy)
1902 sk->sk_prot->destroy(sk);
1903
1904 /*
1905 * Observation: when sock_common_release is called, processes have
1906 * no access to socket. But net still has.
1907 * Step one, detach it from networking:
1908 *
1909 * A. Remove from hash tables.
1910 */
1911
1912 sk->sk_prot->unhash(sk);
1913
1914 /*
1915 * In this point socket cannot receive new packets, but it is possible
1916 * that some packets are in flight because some CPU runs receiver and
1917 * did hash table lookup before we unhashed socket. They will achieve
1918 * receive queue and will be purged by socket destructor.
1919 *
1920 * Also we still have packets pending on receive queue and probably,
1921 * our own packets waiting in device queues. sock_destroy will drain
1922 * receive queue, but transmitted packets will delay socket destruction
1923 * until the last reference will be released.
1924 */
1925
1926 sock_orphan(sk);
1927
1928 xfrm_sk_free_policy(sk);
1929
e6848976 1930 sk_refcnt_debug_release(sk);
1da177e4
LT		 1931 sock_put(sk);
1932}
1933
1934EXPORT_SYMBOL(sk_common_release);
1935
1936static DEFINE_RWLOCK(proto_list_lock);
1937static LIST_HEAD(proto_list);
1938
13ff3d6f
PE		 1939#ifdef CONFIG_PROC_FS
1940#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 1941struct prot_inuse {
1942 int val[PROTO_INUSE_NR];
1943};
13ff3d6f
PE		 1944
1945static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 1946
1947#ifdef CONFIG_NET_NS
1948void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1949{
1950 int cpu = smp_processor_id();
1951 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
1952}
1953EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
1954
1955int sock_prot_inuse_get(struct net *net, struct proto *prot)
1956{
1957 int cpu, idx = prot->inuse_idx;
1958 int res = 0;
1959
1960 for_each_possible_cpu(cpu)
1961 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
1962
1963 return res >= 0 ? res : 0;
1964}
1965EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
1966
1967static int sock_inuse_init_net(struct net *net)
1968{
1969 net->core.inuse = alloc_percpu(struct prot_inuse);
1970 return net->core.inuse ? 0 : -ENOMEM;
1971}
1972
1973static void sock_inuse_exit_net(struct net *net)
1974{
1975 free_percpu(net->core.inuse);
1976}
1977
1978static struct pernet_operations net_inuse_ops = {
1979 .init = sock_inuse_init_net,
1980 .exit = sock_inuse_exit_net,
1981};
1982
1983static __init int net_inuse_init(void)
1984{
1985 if (register_pernet_subsys(&net_inuse_ops))
1986 panic("Cannot initialize net inuse counters");
1987
1988 return 0;
1989}
1990
1991core_initcall(net_inuse_init);
1992#else
1338d466
PE		 1993static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
1994
c29a0bc4 1995void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466
PE		 1996{
1997 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
1998}
1999EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2000
c29a0bc4 2001int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2002{
2003 int cpu, idx = prot->inuse_idx;
2004 int res = 0;
2005
2006 for_each_possible_cpu(cpu)
2007 res += per_cpu(prot_inuse, cpu).val[idx];
2008
2009 return res >= 0 ? res : 0;
2010}
2011EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2012#endif
13ff3d6f
PE		 2013
2014static void assign_proto_idx(struct proto *prot)
2015{
2016 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2017
2018 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2019 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2020 return;
2021 }
2022
2023 set_bit(prot->inuse_idx, proto_inuse_idx);
2024}
2025
2026static void release_proto_idx(struct proto *prot)
2027{
2028 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2029 clear_bit(prot->inuse_idx, proto_inuse_idx);
2030}
2031#else
2032static inline void assign_proto_idx(struct proto *prot)
2033{
2034}
2035
2036static inline void release_proto_idx(struct proto *prot)
2037{
2038}
2039#endif
2040
b733c007
PE		 2041int proto_register(struct proto *prot, int alloc_slab)
2042{
1da177e4
LT		 2043 if (alloc_slab) {
2044 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2045 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2046 NULL);
1da177e4
LT		 2047
2048 if (prot->slab == NULL) {
2049 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2050 prot->name);
60e7663d 2051 goto out;
1da177e4 2052 }
2e6599cb
ACM		 2053
2054 if (prot->rsk_prot != NULL) {
2055 static const char mask[] = "request_sock_%s";
2056
7e56b5d6
CM		 2057 prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2058 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2059 goto out_free_sock_slab;
2060
7e56b5d6
CM		 2061 sprintf(prot->rsk_prot->slab_name, mask, prot->name);
2062 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2063 prot->rsk_prot->obj_size, 0,
20c2df83 2064 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2065
2066 if (prot->rsk_prot->slab == NULL) {
2067 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2068 prot->name);
2069 goto out_free_request_sock_slab_name;
2070 }
2071 }
8feaf0c0 2072
6d6ee43e 2073 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 2074 static const char mask[] = "tw_sock_%s";
2075
7e56b5d6 2076 prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
8feaf0c0 2077
7e56b5d6 2078 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2079 goto out_free_request_sock_slab;
2080
7e56b5d6 2081 sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name);
6d6ee43e 2082 prot->twsk_prot->twsk_slab =
7e56b5d6 2083 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2084 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2085 0,
2086 SLAB_HWCACHE_ALIGN |
2087 prot->slab_flags,
20c2df83 2088 NULL);
6d6ee43e 2089 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2090 goto out_free_timewait_sock_slab_name;
2091 }
1da177e4
LT		 2092 }
2093
2a278051 2094 write_lock(&proto_list_lock);
1da177e4 2095 list_add(&prot->node, &proto_list);
13ff3d6f 2096 assign_proto_idx(prot);
1da177e4 2097 write_unlock(&proto_list_lock);
b733c007
PE		 2098 return 0;
2099
8feaf0c0 2100out_free_timewait_sock_slab_name:
7e56b5d6 2101 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2102out_free_request_sock_slab:
2103 if (prot->rsk_prot && prot->rsk_prot->slab) {
2104 kmem_cache_destroy(prot->rsk_prot->slab);
2105 prot->rsk_prot->slab = NULL;
2106 }
2e6599cb 2107out_free_request_sock_slab_name:
7e56b5d6 2108 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2109out_free_sock_slab:
2110 kmem_cache_destroy(prot->slab);
2111 prot->slab = NULL;
b733c007
PE		 2112out:
2113 return -ENOBUFS;
1da177e4
LT		 2114}
2115
2116EXPORT_SYMBOL(proto_register);
2117
2118void proto_unregister(struct proto *prot)
2119{
2120 write_lock(&proto_list_lock);
13ff3d6f 2121 release_proto_idx(prot);
0a3f4358
PM		 2122 list_del(&prot->node);
2123 write_unlock(&proto_list_lock);
1da177e4
LT		 2124
2125 if (prot->slab != NULL) {
2126 kmem_cache_destroy(prot->slab);
2127 prot->slab = NULL;
2128 }
2129
2e6599cb 2130 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2131 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2132 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2133 prot->rsk_prot->slab = NULL;
2134 }
2135
6d6ee43e 2136 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2137 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2138 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2139 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2140 }
1da177e4
LT		 2141}
2142
2143EXPORT_SYMBOL(proto_unregister);
2144
2145#ifdef CONFIG_PROC_FS
1da177e4 2146static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2147 __acquires(proto_list_lock)
1da177e4
LT		 2148{
2149 read_lock(&proto_list_lock);
60f0438a 2150 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2151}
2152
2153static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2154{
60f0438a 2155 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2156}
2157
2158static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2159 __releases(proto_list_lock)
1da177e4
LT		 2160{
2161 read_unlock(&proto_list_lock);
2162}
2163
2164static char proto_method_implemented(const void *method)
2165{
2166 return method == NULL ? 'n' : 'y';
2167}
2168
2169static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2170{
2171 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2172 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2173 proto->name,
2174 proto->obj_size,
14e943db 2175 sock_prot_inuse_get(seq_file_net(seq), proto),
1da177e4
LT		 2176 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2177 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2178 proto->max_header,
2179 proto->slab == NULL ? "no" : "yes",
2180 module_name(proto->owner),
2181 proto_method_implemented(proto->close),
2182 proto_method_implemented(proto->connect),
2183 proto_method_implemented(proto->disconnect),
2184 proto_method_implemented(proto->accept),
2185 proto_method_implemented(proto->ioctl),
2186 proto_method_implemented(proto->init),
2187 proto_method_implemented(proto->destroy),
2188 proto_method_implemented(proto->shutdown),
2189 proto_method_implemented(proto->setsockopt),
2190 proto_method_implemented(proto->getsockopt),
2191 proto_method_implemented(proto->sendmsg),
2192 proto_method_implemented(proto->recvmsg),
2193 proto_method_implemented(proto->sendpage),
2194 proto_method_implemented(proto->bind),
2195 proto_method_implemented(proto->backlog_rcv),
2196 proto_method_implemented(proto->hash),
2197 proto_method_implemented(proto->unhash),
2198 proto_method_implemented(proto->get_port),
2199 proto_method_implemented(proto->enter_memory_pressure));
2200}
2201
2202static int proto_seq_show(struct seq_file *seq, void *v)
2203{
60f0438a 2204 if (v == &proto_list)
1da177e4
LT		 2205 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2206 "protocol",
2207 "size",
2208 "sockets",
2209 "memory",
2210 "press",
2211 "maxhdr",
2212 "slab",
2213 "module",
2214 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2215 else
60f0438a 2216 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2217 return 0;
2218}
2219
f690808e 2220static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2221 .start = proto_seq_start,
2222 .next = proto_seq_next,
2223 .stop = proto_seq_stop,
2224 .show = proto_seq_show,
2225};
2226
2227static int proto_seq_open(struct inode *inode, struct file *file)
2228{
14e943db
ED		 2229 return seq_open_net(inode, file, &proto_seq_ops,
2230 sizeof(struct seq_net_private));
1da177e4
LT		 2231}
2232
9a32144e 2233static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2234 .owner = THIS_MODULE,
2235 .open = proto_seq_open,
2236 .read = seq_read,
2237 .llseek = seq_lseek,
14e943db
ED		 2238 .release = seq_release_net,
2239};
2240
2241static __net_init int proto_init_net(struct net *net)
2242{
2243 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2244 return -ENOMEM;
2245
2246 return 0;
2247}
2248
2249static __net_exit void proto_exit_net(struct net *net)
2250{
2251 proc_net_remove(net, "protocols");
2252}
2253
2254
2255static __net_initdata struct pernet_operations proto_net_ops = {
2256 .init = proto_init_net,
2257 .exit = proto_exit_net,
1da177e4
LT		 2258};
2259
2260static int __init proto_init(void)
2261{
14e943db 2262 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2263}
2264
2265subsys_initcall(proto_init);
2266
2267#endif /* PROC_FS */
2268
2269EXPORT_SYMBOL(sk_alloc);
2270EXPORT_SYMBOL(sk_free);
2271EXPORT_SYMBOL(sk_send_sigurg);
2272EXPORT_SYMBOL(sock_alloc_send_skb);
2273EXPORT_SYMBOL(sock_init_data);
2274EXPORT_SYMBOL(sock_kfree_s);
2275EXPORT_SYMBOL(sock_kmalloc);
2276EXPORT_SYMBOL(sock_no_accept);
2277EXPORT_SYMBOL(sock_no_bind);
2278EXPORT_SYMBOL(sock_no_connect);
2279EXPORT_SYMBOL(sock_no_getname);
2280EXPORT_SYMBOL(sock_no_getsockopt);
2281EXPORT_SYMBOL(sock_no_ioctl);
2282EXPORT_SYMBOL(sock_no_listen);
2283EXPORT_SYMBOL(sock_no_mmap);
2284EXPORT_SYMBOL(sock_no_poll);
2285EXPORT_SYMBOL(sock_no_recvmsg);
2286EXPORT_SYMBOL(sock_no_sendmsg);
2287EXPORT_SYMBOL(sock_no_sendpage);
2288EXPORT_SYMBOL(sock_no_setsockopt);
2289EXPORT_SYMBOL(sock_no_shutdown);
2290EXPORT_SYMBOL(sock_no_socketpair);
2291EXPORT_SYMBOL(sock_rfree);
2292EXPORT_SYMBOL(sock_setsockopt);
2293EXPORT_SYMBOL(sock_wfree);
2294EXPORT_SYMBOL(sock_wmalloc);
2295EXPORT_SYMBOL(sock_i_uid);
2296EXPORT_SYMBOL(sock_i_ino);
1da177e4 2297EXPORT_SYMBOL(sysctl_optmem_max);
Linux kernel - Deliverables
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