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net: infrastructure for hardware time stamping
[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
df0bca04
CL		 699 v.val = 0;
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
3ab224be 1140 skb_truesize_check(skb);
1da177e4 1141 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1142 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4
LT		 1143}
1144
1145
1146int sock_i_uid(struct sock *sk)
1147{
1148 int uid;
1149
1150 read_lock(&sk->sk_callback_lock);
1151 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1152 read_unlock(&sk->sk_callback_lock);
1153 return uid;
1154}
1155
1156unsigned long sock_i_ino(struct sock *sk)
1157{
1158 unsigned long ino;
1159
1160 read_lock(&sk->sk_callback_lock);
1161 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1162 read_unlock(&sk->sk_callback_lock);
1163 return ino;
1164}
1165
1166/*
1167 * Allocate a skb from the socket's send buffer.
1168 */
86a76caf 1169struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1170 gfp_t priority)
1da177e4
LT		 1171{
1172 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1173 struct sk_buff * skb = alloc_skb(size, priority);
1174 if (skb) {
1175 skb_set_owner_w(skb, sk);
1176 return skb;
1177 }
1178 }
1179 return NULL;
1180}
1181
1182/*
1183 * Allocate a skb from the socket's receive buffer.
4ec93edb 1184 */
86a76caf 1185struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1186 gfp_t priority)
1da177e4
LT		 1187{
1188 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1189 struct sk_buff *skb = alloc_skb(size, priority);
1190 if (skb) {
1191 skb_set_owner_r(skb, sk);
1192 return skb;
1193 }
1194 }
1195 return NULL;
1196}
1197
4ec93edb 1198/*
1da177e4 1199 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1200 */
dd0fc66f 1201void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1202{
1203 if ((unsigned)size <= sysctl_optmem_max &&
1204 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1205 void *mem;
1206 /* First do the add, to avoid the race if kmalloc
4ec93edb 1207 * might sleep.
1da177e4
LT		 1208 */
1209 atomic_add(size, &sk->sk_omem_alloc);
1210 mem = kmalloc(size, priority);
1211 if (mem)
1212 return mem;
1213 atomic_sub(size, &sk->sk_omem_alloc);
1214 }
1215 return NULL;
1216}
1217
1218/*
1219 * Free an option memory block.
1220 */
1221void sock_kfree_s(struct sock *sk, void *mem, int size)
1222{
1223 kfree(mem);
1224 atomic_sub(size, &sk->sk_omem_alloc);
1225}
1226
1227/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1228 I think, these locks should be removed for datagram sockets.
1229 */
1230static long sock_wait_for_wmem(struct sock * sk, long timeo)
1231{
1232 DEFINE_WAIT(wait);
1233
1234 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1235 for (;;) {
1236 if (!timeo)
1237 break;
1238 if (signal_pending(current))
1239 break;
1240 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1241 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1242 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1243 break;
1244 if (sk->sk_shutdown & SEND_SHUTDOWN)
1245 break;
1246 if (sk->sk_err)
1247 break;
1248 timeo = schedule_timeout(timeo);
1249 }
1250 finish_wait(sk->sk_sleep, &wait);
1251 return timeo;
1252}
1253
1254
1255/*
1256 * Generic send/receive buffer handlers
1257 */
1258
4cc7f68d
HX		 1259struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1260 unsigned long data_len, int noblock,
1261 int *errcode)
1da177e4
LT		 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}
4cc7f68d 1341EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1342
4ec93edb 1343struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1344 int noblock, int *errcode)
1345{
1346 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1347}
1348
1349static void __lock_sock(struct sock *sk)
1350{
1351 DEFINE_WAIT(wait);
1352
e71a4783 1353 for (;;) {
1da177e4
LT		 1354 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1355 TASK_UNINTERRUPTIBLE);
1356 spin_unlock_bh(&sk->sk_lock.slock);
1357 schedule();
1358 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1359 if (!sock_owned_by_user(sk))
1da177e4
LT		 1360 break;
1361 }
1362 finish_wait(&sk->sk_lock.wq, &wait);
1363}
1364
1365static void __release_sock(struct sock *sk)
1366{
1367 struct sk_buff *skb = sk->sk_backlog.head;
1368
1369 do {
1370 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1371 bh_unlock_sock(sk);
1372
1373 do {
1374 struct sk_buff *next = skb->next;
1375
1376 skb->next = NULL;
c57943a1 1377 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1378
1379 /*
1380 * We are in process context here with softirqs
1381 * disabled, use cond_resched_softirq() to preempt.
1382 * This is safe to do because we've taken the backlog
1383 * queue private:
1384 */
1385 cond_resched_softirq();
1386
1387 skb = next;
1388 } while (skb != NULL);
1389
1390 bh_lock_sock(sk);
e71a4783 1391 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1392}
1393
1394/**
1395 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1396 * @sk: sock to wait on
1397 * @timeo: for how long
1da177e4
LT		 1398 *
1399 * Now socket state including sk->sk_err is changed only under lock,
1400 * hence we may omit checks after joining wait queue.
1401 * We check receive queue before schedule() only as optimization;
1402 * it is very likely that release_sock() added new data.
1403 */
1404int sk_wait_data(struct sock *sk, long *timeo)
1405{
1406 int rc;
1407 DEFINE_WAIT(wait);
1408
1409 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1410 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1411 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1412 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1413 finish_wait(sk->sk_sleep, &wait);
1414 return rc;
1415}
1416
1417EXPORT_SYMBOL(sk_wait_data);
1418
3ab224be
HA		 1419/**
1420 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1421 * @sk: socket
1422 * @size: memory size to allocate
1423 * @kind: allocation type
1424 *
1425 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1426 * rmem allocation. This function assumes that protocols which have
1427 * memory_pressure use sk_wmem_queued as write buffer accounting.
1428 */
1429int __sk_mem_schedule(struct sock *sk, int size, int kind)
1430{
1431 struct proto *prot = sk->sk_prot;
1432 int amt = sk_mem_pages(size);
1433 int allocated;
1434
1435 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1436 allocated = atomic_add_return(amt, prot->memory_allocated);
1437
1438 /* Under limit. */
1439 if (allocated <= prot->sysctl_mem[0]) {
1440 if (prot->memory_pressure && *prot->memory_pressure)
1441 *prot->memory_pressure = 0;
1442 return 1;
1443 }
1444
1445 /* Under pressure. */
1446 if (allocated > prot->sysctl_mem[1])
1447 if (prot->enter_memory_pressure)
5c52ba17 1448 prot->enter_memory_pressure(sk);
3ab224be
HA		 1449
1450 /* Over hard limit. */
1451 if (allocated > prot->sysctl_mem[2])
1452 goto suppress_allocation;
1453
1454 /* guarantee minimum buffer size under pressure */
1455 if (kind == SK_MEM_RECV) {
1456 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1457 return 1;
1458 } else { /* SK_MEM_SEND */
1459 if (sk->sk_type == SOCK_STREAM) {
1460 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1461 return 1;
1462 } else if (atomic_read(&sk->sk_wmem_alloc) <
1463 prot->sysctl_wmem[0])
1464 return 1;
1465 }
1466
1467 if (prot->memory_pressure) {
1748376b
ED		 1468 int alloc;
1469
1470 if (!*prot->memory_pressure)
1471 return 1;
1472 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1473 if (prot->sysctl_mem[2] > alloc *
3ab224be
HA		 1474 sk_mem_pages(sk->sk_wmem_queued +
1475 atomic_read(&sk->sk_rmem_alloc) +
1476 sk->sk_forward_alloc))
1477 return 1;
1478 }
1479
1480suppress_allocation:
1481
1482 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1483 sk_stream_moderate_sndbuf(sk);
1484
1485 /* Fail only if socket is _under_ its sndbuf.
1486 * In this case we cannot block, so that we have to fail.
1487 */
1488 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1489 return 1;
1490 }
1491
1492 /* Alas. Undo changes. */
1493 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1494 atomic_sub(amt, prot->memory_allocated);
1495 return 0;
1496}
1497
1498EXPORT_SYMBOL(__sk_mem_schedule);
1499
1500/**
1501 * __sk_reclaim - reclaim memory_allocated
1502 * @sk: socket
1503 */
1504void __sk_mem_reclaim(struct sock *sk)
1505{
1506 struct proto *prot = sk->sk_prot;
1507
680a5a50 1508 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1509 prot->memory_allocated);
1510 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1511
1512 if (prot->memory_pressure && *prot->memory_pressure &&
1513 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1514 *prot->memory_pressure = 0;
1515}
1516
1517EXPORT_SYMBOL(__sk_mem_reclaim);
1518
1519
1da177e4
LT		 1520/*
1521 * Set of default routines for initialising struct proto_ops when
1522 * the protocol does not support a particular function. In certain
1523 * cases where it makes no sense for a protocol to have a "do nothing"
1524 * function, some default processing is provided.
1525 */
1526
1527int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1528{
1529 return -EOPNOTSUPP;
1530}
1531
4ec93edb 1532int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1533 int len, int flags)
1534{
1535 return -EOPNOTSUPP;
1536}
1537
1538int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1539{
1540 return -EOPNOTSUPP;
1541}
1542
1543int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1544{
1545 return -EOPNOTSUPP;
1546}
1547
4ec93edb 1548int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1549 int *len, int peer)
1550{
1551 return -EOPNOTSUPP;
1552}
1553
1554unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1555{
1556 return 0;
1557}
1558
1559int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1560{
1561 return -EOPNOTSUPP;
1562}
1563
1564int sock_no_listen(struct socket *sock, int backlog)
1565{
1566 return -EOPNOTSUPP;
1567}
1568
1569int sock_no_shutdown(struct socket *sock, int how)
1570{
1571 return -EOPNOTSUPP;
1572}
1573
1574int sock_no_setsockopt(struct socket *sock, int level, int optname,
1575 char __user *optval, int optlen)
1576{
1577 return -EOPNOTSUPP;
1578}
1579
1580int sock_no_getsockopt(struct socket *sock, int level, int optname,
1581 char __user *optval, int __user *optlen)
1582{
1583 return -EOPNOTSUPP;
1584}
1585
1586int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1587 size_t len)
1588{
1589 return -EOPNOTSUPP;
1590}
1591
1592int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1593 size_t len, int flags)
1594{
1595 return -EOPNOTSUPP;
1596}
1597
1598int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1599{
1600 /* Mirror missing mmap method error code */
1601 return -ENODEV;
1602}
1603
1604ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1605{
1606 ssize_t res;
1607 struct msghdr msg = {.msg_flags = flags};
1608 struct kvec iov;
1609 char *kaddr = kmap(page);
1610 iov.iov_base = kaddr + offset;
1611 iov.iov_len = size;
1612 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1613 kunmap(page);
1614 return res;
1615}
1616
1617/*
1618 * Default Socket Callbacks
1619 */
1620
1621static void sock_def_wakeup(struct sock *sk)
1622{
1623 read_lock(&sk->sk_callback_lock);
1624 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1625 wake_up_interruptible_all(sk->sk_sleep);
1626 read_unlock(&sk->sk_callback_lock);
1627}
1628
1629static void sock_def_error_report(struct sock *sk)
1630{
1631 read_lock(&sk->sk_callback_lock);
1632 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1633 wake_up_interruptible(sk->sk_sleep);
8d8ad9d7 1634 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1da177e4
LT		 1635 read_unlock(&sk->sk_callback_lock);
1636}
1637
1638static void sock_def_readable(struct sock *sk, int len)
1639{
1640 read_lock(&sk->sk_callback_lock);
1641 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
6f3d0929 1642 wake_up_interruptible_sync(sk->sk_sleep);
8d8ad9d7 1643 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1da177e4
LT		 1644 read_unlock(&sk->sk_callback_lock);
1645}
1646
1647static void sock_def_write_space(struct sock *sk)
1648{
1649 read_lock(&sk->sk_callback_lock);
1650
1651 /* Do not wake up a writer until he can make "significant"
1652 * progress. --DaveM
1653 */
e71a4783 1654 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1da177e4 1655 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
6f3d0929 1656 wake_up_interruptible_sync(sk->sk_sleep);
1da177e4
LT		 1657
1658 /* Should agree with poll, otherwise some programs break */
1659 if (sock_writeable(sk))
8d8ad9d7 1660 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1661 }
1662
1663 read_unlock(&sk->sk_callback_lock);
1664}
1665
1666static void sock_def_destruct(struct sock *sk)
1667{
a51482bd 1668 kfree(sk->sk_protinfo);
1da177e4
LT		 1669}
1670
1671void sk_send_sigurg(struct sock *sk)
1672{
1673 if (sk->sk_socket && sk->sk_socket->file)
1674 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1675 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4
LT		 1676}
1677
1678void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1679 unsigned long expires)
1680{
1681 if (!mod_timer(timer, expires))
1682 sock_hold(sk);
1683}
1684
1685EXPORT_SYMBOL(sk_reset_timer);
1686
1687void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1688{
1689 if (timer_pending(timer) && del_timer(timer))
1690 __sock_put(sk);
1691}
1692
1693EXPORT_SYMBOL(sk_stop_timer);
1694
1695void sock_init_data(struct socket *sock, struct sock *sk)
1696{
1697 skb_queue_head_init(&sk->sk_receive_queue);
1698 skb_queue_head_init(&sk->sk_write_queue);
1699 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1700#ifdef CONFIG_NET_DMA
1701 skb_queue_head_init(&sk->sk_async_wait_queue);
1702#endif
1da177e4
LT		 1703
1704 sk->sk_send_head = NULL;
1705
1706 init_timer(&sk->sk_timer);
4ec93edb 1707
1da177e4
LT		 1708 sk->sk_allocation = GFP_KERNEL;
1709 sk->sk_rcvbuf = sysctl_rmem_default;
1710 sk->sk_sndbuf = sysctl_wmem_default;
1711 sk->sk_state = TCP_CLOSE;
972692e0 1712 sk_set_socket(sk, sock);
1da177e4
LT		 1713
1714 sock_set_flag(sk, SOCK_ZAPPED);
1715
e71a4783 1716 if (sock) {
1da177e4
LT		 1717 sk->sk_type = sock->type;
1718 sk->sk_sleep = &sock->wait;
1719 sock->sk = sk;
1720 } else
1721 sk->sk_sleep = NULL;
1722
1723 rwlock_init(&sk->sk_dst_lock);
1724 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1725 lockdep_set_class_and_name(&sk->sk_callback_lock,
1726 af_callback_keys + sk->sk_family,
1727 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1728
1729 sk->sk_state_change = sock_def_wakeup;
1730 sk->sk_data_ready = sock_def_readable;
1731 sk->sk_write_space = sock_def_write_space;
1732 sk->sk_error_report = sock_def_error_report;
1733 sk->sk_destruct = sock_def_destruct;
1734
1735 sk->sk_sndmsg_page = NULL;
1736 sk->sk_sndmsg_off = 0;
1737
1738 sk->sk_peercred.pid = 0;
1739 sk->sk_peercred.uid = -1;
1740 sk->sk_peercred.gid = -1;
1741 sk->sk_write_pending = 0;
1742 sk->sk_rcvlowat = 1;
1743 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1744 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1745
f37f0afb 1746 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4
LT		 1747
1748 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1749 atomic_set(&sk->sk_drops, 0);
1da177e4
LT		 1750}
1751
b5606c2d 1752void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1753{
1754 might_sleep();
a5b5bb9a 1755 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1756 if (sk->sk_lock.owned)
1da177e4 1757 __lock_sock(sk);
d2e9117c 1758 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1759 spin_unlock(&sk->sk_lock.slock);
1760 /*
1761 * The sk_lock has mutex_lock() semantics here:
1762 */
fcc70d5f 1763 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1764 local_bh_enable();
1da177e4
LT		 1765}
1766
fcc70d5f 1767EXPORT_SYMBOL(lock_sock_nested);
1da177e4 1768
b5606c2d 1769void release_sock(struct sock *sk)
1da177e4 1770{
a5b5bb9a
IM		 1771 /*
1772 * The sk_lock has mutex_unlock() semantics:
1773 */
1774 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1775
1776 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1777 if (sk->sk_backlog.tail)
1778 __release_sock(sk);
d2e9117c 1779 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1780 if (waitqueue_active(&sk->sk_lock.wq))
1781 wake_up(&sk->sk_lock.wq);
1782 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1783}
1784EXPORT_SYMBOL(release_sock);
1785
1786int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1787{
b7aa0bf7 1788 struct timeval tv;
1da177e4
LT		 1789 if (!sock_flag(sk, SOCK_TIMESTAMP))
1790 sock_enable_timestamp(sk);
b7aa0bf7
ED		 1791 tv = ktime_to_timeval(sk->sk_stamp);
1792 if (tv.tv_sec == -1)
1da177e4 1793 return -ENOENT;
b7aa0bf7
ED		 1794 if (tv.tv_sec == 0) {
1795 sk->sk_stamp = ktime_get_real();
1796 tv = ktime_to_timeval(sk->sk_stamp);
1797 }
1798 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1799}
1da177e4
LT		 1800EXPORT_SYMBOL(sock_get_timestamp);
1801
ae40eb1e
ED		 1802int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1803{
1804 struct timespec ts;
1805 if (!sock_flag(sk, SOCK_TIMESTAMP))
1806 sock_enable_timestamp(sk);
1807 ts = ktime_to_timespec(sk->sk_stamp);
1808 if (ts.tv_sec == -1)
1809 return -ENOENT;
1810 if (ts.tv_sec == 0) {
1811 sk->sk_stamp = ktime_get_real();
1812 ts = ktime_to_timespec(sk->sk_stamp);
1813 }
1814 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1815}
1816EXPORT_SYMBOL(sock_get_timestampns);
1817
1da177e4 1818void sock_enable_timestamp(struct sock *sk)
4ec93edb
YH		 1819{
1820 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 1821 sock_set_flag(sk, SOCK_TIMESTAMP);
1822 net_enable_timestamp();
1823 }
1824}
1da177e4
LT		 1825
1826/*
1827 * Get a socket option on an socket.
1828 *
1829 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1830 * asynchronous errors should be reported by getsockopt. We assume
1831 * this means if you specify SO_ERROR (otherwise whats the point of it).
1832 */
1833int sock_common_getsockopt(struct socket *sock, int level, int optname,
1834 char __user *optval, int __user *optlen)
1835{
1836 struct sock *sk = sock->sk;
1837
1838 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1839}
1840
1841EXPORT_SYMBOL(sock_common_getsockopt);
1842
3fdadf7d 1843#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1844int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1845 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1846{
1847 struct sock *sk = sock->sk;
1848
1e51f951 1849 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 1850 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1851 optval, optlen);
3fdadf7d
DM		 1852 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1853}
1854EXPORT_SYMBOL(compat_sock_common_getsockopt);
1855#endif
1856
1da177e4
LT		 1857int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1858 struct msghdr *msg, size_t size, int flags)
1859{
1860 struct sock *sk = sock->sk;
1861 int addr_len = 0;
1862 int err;
1863
1864 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1865 flags & ~MSG_DONTWAIT, &addr_len);
1866 if (err >= 0)
1867 msg->msg_namelen = addr_len;
1868 return err;
1869}
1870
1871EXPORT_SYMBOL(sock_common_recvmsg);
1872
1873/*
1874 * Set socket options on an inet socket.
1875 */
1876int sock_common_setsockopt(struct socket *sock, int level, int optname,
1877 char __user *optval, int optlen)
1878{
1879 struct sock *sk = sock->sk;
1880
1881 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1882}
1883
1884EXPORT_SYMBOL(sock_common_setsockopt);
1885
3fdadf7d 1886#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1887int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1888 char __user *optval, int optlen)
3fdadf7d
DM		 1889{
1890 struct sock *sk = sock->sk;
1891
543d9cfe
ACM		 1892 if (sk->sk_prot->compat_setsockopt != NULL)
1893 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1894 optval, optlen);
3fdadf7d
DM		 1895 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1896}
1897EXPORT_SYMBOL(compat_sock_common_setsockopt);
1898#endif
1899
1da177e4
LT		 1900void sk_common_release(struct sock *sk)
1901{
1902 if (sk->sk_prot->destroy)
1903 sk->sk_prot->destroy(sk);
1904
1905 /*
1906 * Observation: when sock_common_release is called, processes have
1907 * no access to socket. But net still has.
1908 * Step one, detach it from networking:
1909 *
1910 * A. Remove from hash tables.
1911 */
1912
1913 sk->sk_prot->unhash(sk);
1914
1915 /*
1916 * In this point socket cannot receive new packets, but it is possible
1917 * that some packets are in flight because some CPU runs receiver and
1918 * did hash table lookup before we unhashed socket. They will achieve
1919 * receive queue and will be purged by socket destructor.
1920 *
1921 * Also we still have packets pending on receive queue and probably,
1922 * our own packets waiting in device queues. sock_destroy will drain
1923 * receive queue, but transmitted packets will delay socket destruction
1924 * until the last reference will be released.
1925 */
1926
1927 sock_orphan(sk);
1928
1929 xfrm_sk_free_policy(sk);
1930
e6848976 1931 sk_refcnt_debug_release(sk);
1da177e4
LT		 1932 sock_put(sk);
1933}
1934
1935EXPORT_SYMBOL(sk_common_release);
1936
1937static DEFINE_RWLOCK(proto_list_lock);
1938static LIST_HEAD(proto_list);
1939
13ff3d6f
PE		 1940#ifdef CONFIG_PROC_FS
1941#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 1942struct prot_inuse {
1943 int val[PROTO_INUSE_NR];
1944};
13ff3d6f
PE		 1945
1946static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 1947
1948#ifdef CONFIG_NET_NS
1949void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1950{
1951 int cpu = smp_processor_id();
1952 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
1953}
1954EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
1955
1956int sock_prot_inuse_get(struct net *net, struct proto *prot)
1957{
1958 int cpu, idx = prot->inuse_idx;
1959 int res = 0;
1960
1961 for_each_possible_cpu(cpu)
1962 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
1963
1964 return res >= 0 ? res : 0;
1965}
1966EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
1967
1968static int sock_inuse_init_net(struct net *net)
1969{
1970 net->core.inuse = alloc_percpu(struct prot_inuse);
1971 return net->core.inuse ? 0 : -ENOMEM;
1972}
1973
1974static void sock_inuse_exit_net(struct net *net)
1975{
1976 free_percpu(net->core.inuse);
1977}
1978
1979static struct pernet_operations net_inuse_ops = {
1980 .init = sock_inuse_init_net,
1981 .exit = sock_inuse_exit_net,
1982};
1983
1984static __init int net_inuse_init(void)
1985{
1986 if (register_pernet_subsys(&net_inuse_ops))
1987 panic("Cannot initialize net inuse counters");
1988
1989 return 0;
1990}
1991
1992core_initcall(net_inuse_init);
1993#else
1338d466
PE		 1994static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
1995
c29a0bc4 1996void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466
PE		 1997{
1998 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
1999}
2000EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2001
c29a0bc4 2002int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2003{
2004 int cpu, idx = prot->inuse_idx;
2005 int res = 0;
2006
2007 for_each_possible_cpu(cpu)
2008 res += per_cpu(prot_inuse, cpu).val[idx];
2009
2010 return res >= 0 ? res : 0;
2011}
2012EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2013#endif
13ff3d6f
PE		 2014
2015static void assign_proto_idx(struct proto *prot)
2016{
2017 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2018
2019 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2020 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2021 return;
2022 }
2023
2024 set_bit(prot->inuse_idx, proto_inuse_idx);
2025}
2026
2027static void release_proto_idx(struct proto *prot)
2028{
2029 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2030 clear_bit(prot->inuse_idx, proto_inuse_idx);
2031}
2032#else
2033static inline void assign_proto_idx(struct proto *prot)
2034{
2035}
2036
2037static inline void release_proto_idx(struct proto *prot)
2038{
2039}
2040#endif
2041
b733c007
PE		 2042int proto_register(struct proto *prot, int alloc_slab)
2043{
1da177e4
LT		 2044 if (alloc_slab) {
2045 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2046 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2047 NULL);
1da177e4
LT		 2048
2049 if (prot->slab == NULL) {
2050 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2051 prot->name);
60e7663d 2052 goto out;
1da177e4 2053 }
2e6599cb
ACM		 2054
2055 if (prot->rsk_prot != NULL) {
2056 static const char mask[] = "request_sock_%s";
2057
7e56b5d6
CM		 2058 prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2059 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2060 goto out_free_sock_slab;
2061
7e56b5d6
CM		 2062 sprintf(prot->rsk_prot->slab_name, mask, prot->name);
2063 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2064 prot->rsk_prot->obj_size, 0,
20c2df83 2065 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2066
2067 if (prot->rsk_prot->slab == NULL) {
2068 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2069 prot->name);
2070 goto out_free_request_sock_slab_name;
2071 }
2072 }
8feaf0c0 2073
6d6ee43e 2074 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 2075 static const char mask[] = "tw_sock_%s";
2076
7e56b5d6 2077 prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
8feaf0c0 2078
7e56b5d6 2079 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2080 goto out_free_request_sock_slab;
2081
7e56b5d6 2082 sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name);
6d6ee43e 2083 prot->twsk_prot->twsk_slab =
7e56b5d6 2084 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2085 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2086 0,
2087 SLAB_HWCACHE_ALIGN |
2088 prot->slab_flags,
20c2df83 2089 NULL);
6d6ee43e 2090 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2091 goto out_free_timewait_sock_slab_name;
2092 }
1da177e4
LT		 2093 }
2094
2a278051 2095 write_lock(&proto_list_lock);
1da177e4 2096 list_add(&prot->node, &proto_list);
13ff3d6f 2097 assign_proto_idx(prot);
1da177e4 2098 write_unlock(&proto_list_lock);
b733c007
PE		 2099 return 0;
2100
8feaf0c0 2101out_free_timewait_sock_slab_name:
7e56b5d6 2102 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2103out_free_request_sock_slab:
2104 if (prot->rsk_prot && prot->rsk_prot->slab) {
2105 kmem_cache_destroy(prot->rsk_prot->slab);
2106 prot->rsk_prot->slab = NULL;
2107 }
2e6599cb 2108out_free_request_sock_slab_name:
7e56b5d6 2109 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2110out_free_sock_slab:
2111 kmem_cache_destroy(prot->slab);
2112 prot->slab = NULL;
b733c007
PE		 2113out:
2114 return -ENOBUFS;
1da177e4
LT		 2115}
2116
2117EXPORT_SYMBOL(proto_register);
2118
2119void proto_unregister(struct proto *prot)
2120{
2121 write_lock(&proto_list_lock);
13ff3d6f 2122 release_proto_idx(prot);
0a3f4358
PM		 2123 list_del(&prot->node);
2124 write_unlock(&proto_list_lock);
1da177e4
LT		 2125
2126 if (prot->slab != NULL) {
2127 kmem_cache_destroy(prot->slab);
2128 prot->slab = NULL;
2129 }
2130
2e6599cb 2131 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2132 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2133 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2134 prot->rsk_prot->slab = NULL;
2135 }
2136
6d6ee43e 2137 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2138 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2139 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2140 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2141 }
1da177e4
LT		 2142}
2143
2144EXPORT_SYMBOL(proto_unregister);
2145
2146#ifdef CONFIG_PROC_FS
1da177e4 2147static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2148 __acquires(proto_list_lock)
1da177e4
LT		 2149{
2150 read_lock(&proto_list_lock);
60f0438a 2151 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2152}
2153
2154static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2155{
60f0438a 2156 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2157}
2158
2159static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2160 __releases(proto_list_lock)
1da177e4
LT		 2161{
2162 read_unlock(&proto_list_lock);
2163}
2164
2165static char proto_method_implemented(const void *method)
2166{
2167 return method == NULL ? 'n' : 'y';
2168}
2169
2170static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2171{
2172 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2173 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2174 proto->name,
2175 proto->obj_size,
14e943db 2176 sock_prot_inuse_get(seq_file_net(seq), proto),
1da177e4
LT		 2177 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2178 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2179 proto->max_header,
2180 proto->slab == NULL ? "no" : "yes",
2181 module_name(proto->owner),
2182 proto_method_implemented(proto->close),
2183 proto_method_implemented(proto->connect),
2184 proto_method_implemented(proto->disconnect),
2185 proto_method_implemented(proto->accept),
2186 proto_method_implemented(proto->ioctl),
2187 proto_method_implemented(proto->init),
2188 proto_method_implemented(proto->destroy),
2189 proto_method_implemented(proto->shutdown),
2190 proto_method_implemented(proto->setsockopt),
2191 proto_method_implemented(proto->getsockopt),
2192 proto_method_implemented(proto->sendmsg),
2193 proto_method_implemented(proto->recvmsg),
2194 proto_method_implemented(proto->sendpage),
2195 proto_method_implemented(proto->bind),
2196 proto_method_implemented(proto->backlog_rcv),
2197 proto_method_implemented(proto->hash),
2198 proto_method_implemented(proto->unhash),
2199 proto_method_implemented(proto->get_port),
2200 proto_method_implemented(proto->enter_memory_pressure));
2201}
2202
2203static int proto_seq_show(struct seq_file *seq, void *v)
2204{
60f0438a 2205 if (v == &proto_list)
1da177e4
LT		 2206 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2207 "protocol",
2208 "size",
2209 "sockets",
2210 "memory",
2211 "press",
2212 "maxhdr",
2213 "slab",
2214 "module",
2215 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2216 else
60f0438a 2217 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2218 return 0;
2219}
2220
f690808e 2221static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2222 .start = proto_seq_start,
2223 .next = proto_seq_next,
2224 .stop = proto_seq_stop,
2225 .show = proto_seq_show,
2226};
2227
2228static int proto_seq_open(struct inode *inode, struct file *file)
2229{
14e943db
ED		 2230 return seq_open_net(inode, file, &proto_seq_ops,
2231 sizeof(struct seq_net_private));
1da177e4
LT		 2232}
2233
9a32144e 2234static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2235 .owner = THIS_MODULE,
2236 .open = proto_seq_open,
2237 .read = seq_read,
2238 .llseek = seq_lseek,
14e943db
ED		 2239 .release = seq_release_net,
2240};
2241
2242static __net_init int proto_init_net(struct net *net)
2243{
2244 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2245 return -ENOMEM;
2246
2247 return 0;
2248}
2249
2250static __net_exit void proto_exit_net(struct net *net)
2251{
2252 proc_net_remove(net, "protocols");
2253}
2254
2255
2256static __net_initdata struct pernet_operations proto_net_ops = {
2257 .init = proto_init_net,
2258 .exit = proto_exit_net,
1da177e4
LT		 2259};
2260
2261static int __init proto_init(void)
2262{
14e943db 2263 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2264}
2265
2266subsys_initcall(proto_init);
2267
2268#endif /* PROC_FS */
2269
2270EXPORT_SYMBOL(sk_alloc);
2271EXPORT_SYMBOL(sk_free);
2272EXPORT_SYMBOL(sk_send_sigurg);
2273EXPORT_SYMBOL(sock_alloc_send_skb);
2274EXPORT_SYMBOL(sock_init_data);
2275EXPORT_SYMBOL(sock_kfree_s);
2276EXPORT_SYMBOL(sock_kmalloc);
2277EXPORT_SYMBOL(sock_no_accept);
2278EXPORT_SYMBOL(sock_no_bind);
2279EXPORT_SYMBOL(sock_no_connect);
2280EXPORT_SYMBOL(sock_no_getname);
2281EXPORT_SYMBOL(sock_no_getsockopt);
2282EXPORT_SYMBOL(sock_no_ioctl);
2283EXPORT_SYMBOL(sock_no_listen);
2284EXPORT_SYMBOL(sock_no_mmap);
2285EXPORT_SYMBOL(sock_no_poll);
2286EXPORT_SYMBOL(sock_no_recvmsg);
2287EXPORT_SYMBOL(sock_no_sendmsg);
2288EXPORT_SYMBOL(sock_no_sendpage);
2289EXPORT_SYMBOL(sock_no_setsockopt);
2290EXPORT_SYMBOL(sock_no_shutdown);
2291EXPORT_SYMBOL(sock_no_socketpair);
2292EXPORT_SYMBOL(sock_rfree);
2293EXPORT_SYMBOL(sock_setsockopt);
2294EXPORT_SYMBOL(sock_wfree);
2295EXPORT_SYMBOL(sock_wmalloc);
2296EXPORT_SYMBOL(sock_i_uid);
2297EXPORT_SYMBOL(sock_i_ino);
1da177e4 2298EXPORT_SYMBOL(sysctl_optmem_max);
Linux kernel - Deliverables
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