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tc: policing requires a rate estimator
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
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);
292
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
e71a4783
SH		 699 switch(optname) {
700 case SO_DEBUG:
701 v.val = sock_flag(sk, SOCK_DBG);
702 break;
703
704 case SO_DONTROUTE:
705 v.val = sock_flag(sk, SOCK_LOCALROUTE);
706 break;
707
708 case SO_BROADCAST:
709 v.val = !!sock_flag(sk, SOCK_BROADCAST);
710 break;
711
712 case SO_SNDBUF:
713 v.val = sk->sk_sndbuf;
714 break;
715
716 case SO_RCVBUF:
717 v.val = sk->sk_rcvbuf;
718 break;
719
720 case SO_REUSEADDR:
721 v.val = sk->sk_reuse;
722 break;
723
724 case SO_KEEPALIVE:
725 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
726 break;
727
728 case SO_TYPE:
729 v.val = sk->sk_type;
730 break;
731
732 case SO_ERROR:
733 v.val = -sock_error(sk);
734 if (v.val==0)
735 v.val = xchg(&sk->sk_err_soft, 0);
736 break;
737
738 case SO_OOBINLINE:
739 v.val = !!sock_flag(sk, SOCK_URGINLINE);
740 break;
741
742 case SO_NO_CHECK:
743 v.val = sk->sk_no_check;
744 break;
745
746 case SO_PRIORITY:
747 v.val = sk->sk_priority;
748 break;
749
750 case SO_LINGER:
751 lv = sizeof(v.ling);
752 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
753 v.ling.l_linger = sk->sk_lingertime / HZ;
754 break;
755
756 case SO_BSDCOMPAT:
757 sock_warn_obsolete_bsdism("getsockopt");
758 break;
759
760 case SO_TIMESTAMP:
92f37fd2
ED		 761 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
762 !sock_flag(sk, SOCK_RCVTSTAMPNS);
763 break;
764
765 case SO_TIMESTAMPNS:
766 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 767 break;
768
769 case SO_RCVTIMEO:
770 lv=sizeof(struct timeval);
771 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
772 v.tm.tv_sec = 0;
773 v.tm.tv_usec = 0;
774 } else {
775 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
776 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
777 }
778 break;
779
780 case SO_SNDTIMEO:
781 lv=sizeof(struct timeval);
782 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
783 v.tm.tv_sec = 0;
784 v.tm.tv_usec = 0;
785 } else {
786 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
787 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
788 }
789 break;
1da177e4 790
e71a4783
SH		 791 case SO_RCVLOWAT:
792 v.val = sk->sk_rcvlowat;
793 break;
1da177e4 794
e71a4783
SH		 795 case SO_SNDLOWAT:
796 v.val=1;
797 break;
1da177e4 798
e71a4783
SH		 799 case SO_PASSCRED:
800 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
801 break;
1da177e4 802
e71a4783
SH		 803 case SO_PEERCRED:
804 if (len > sizeof(sk->sk_peercred))
805 len = sizeof(sk->sk_peercred);
806 if (copy_to_user(optval, &sk->sk_peercred, len))
807 return -EFAULT;
808 goto lenout;
1da177e4 809
e71a4783
SH		 810 case SO_PEERNAME:
811 {
812 char address[128];
813
814 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
815 return -ENOTCONN;
816 if (lv < len)
817 return -EINVAL;
818 if (copy_to_user(optval, address, len))
819 return -EFAULT;
820 goto lenout;
821 }
1da177e4 822
e71a4783
SH		 823 /* Dubious BSD thing... Probably nobody even uses it, but
824 * the UNIX standard wants it for whatever reason... -DaveM
825 */
826 case SO_ACCEPTCONN:
827 v.val = sk->sk_state == TCP_LISTEN;
828 break;
1da177e4 829
e71a4783
SH		 830 case SO_PASSSEC:
831 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
832 break;
877ce7c1 833
e71a4783
SH		 834 case SO_PEERSEC:
835 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 836
4a19ec58
LAT		 837 case SO_MARK:
838 v.val = sk->sk_mark;
839 break;
840
e71a4783
SH		 841 default:
842 return -ENOPROTOOPT;
1da177e4 843 }
e71a4783 844
1da177e4
LT		 845 if (len > lv)
846 len = lv;
847 if (copy_to_user(optval, &v, len))
848 return -EFAULT;
849lenout:
4ec93edb
YH		 850 if (put_user(len, optlen))
851 return -EFAULT;
852 return 0;
1da177e4
LT		 853}
854
a5b5bb9a
IM		 855/*
856 * Initialize an sk_lock.
857 *
858 * (We also register the sk_lock with the lock validator.)
859 */
b6f99a21 860static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 861{
ed07536e
PZ		 862 sock_lock_init_class_and_name(sk,
863 af_family_slock_key_strings[sk->sk_family],
864 af_family_slock_keys + sk->sk_family,
865 af_family_key_strings[sk->sk_family],
866 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 867}
868
f1a6c4da
PE		 869static void sock_copy(struct sock *nsk, const struct sock *osk)
870{
871#ifdef CONFIG_SECURITY_NETWORK
872 void *sptr = nsk->sk_security;
873#endif
874
875 memcpy(nsk, osk, osk->sk_prot->obj_size);
f1a6c4da
PE		 876#ifdef CONFIG_SECURITY_NETWORK
877 nsk->sk_security = sptr;
878 security_sk_clone(osk, nsk);
879#endif
880}
881
2e4afe7b
PE		 882static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
883 int family)
c308c1b2
PE		 884{
885 struct sock *sk;
886 struct kmem_cache *slab;
887
888 slab = prot->slab;
889 if (slab != NULL)
890 sk = kmem_cache_alloc(slab, priority);
891 else
892 sk = kmalloc(prot->obj_size, priority);
893
2e4afe7b
PE		 894 if (sk != NULL) {
895 if (security_sk_alloc(sk, family, priority))
896 goto out_free;
897
898 if (!try_module_get(prot->owner))
899 goto out_free_sec;
900 }
901
c308c1b2 902 return sk;
2e4afe7b
PE		 903
904out_free_sec:
905 security_sk_free(sk);
906out_free:
907 if (slab != NULL)
908 kmem_cache_free(slab, sk);
909 else
910 kfree(sk);
911 return NULL;
c308c1b2
PE		 912}
913
914static void sk_prot_free(struct proto *prot, struct sock *sk)
915{
916 struct kmem_cache *slab;
2e4afe7b 917 struct module *owner;
c308c1b2 918
2e4afe7b 919 owner = prot->owner;
c308c1b2 920 slab = prot->slab;
2e4afe7b
PE		 921
922 security_sk_free(sk);
c308c1b2
PE		 923 if (slab != NULL)
924 kmem_cache_free(slab, sk);
925 else
926 kfree(sk);
2e4afe7b 927 module_put(owner);
c308c1b2
PE		 928}
929
1da177e4
LT		 930/**
931 * sk_alloc - All socket objects are allocated here
c4ea43c5 932 * @net: the applicable net namespace
4dc3b16b
PP		 933 * @family: protocol family
934 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
935 * @prot: struct proto associated with this new sock instance
1da177e4 936 */
1b8d7ae4 937struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 938 struct proto *prot)
1da177e4 939{
c308c1b2 940 struct sock *sk;
1da177e4 941
154adbc8 942 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 943 if (sk) {
154adbc8
PE		 944 sk->sk_family = family;
945 /*
946 * See comment in struct sock definition to understand
947 * why we need sk_prot_creator -acme
948 */
949 sk->sk_prot = sk->sk_prot_creator = prot;
950 sock_lock_init(sk);
3b1e0a65 951 sock_net_set(sk, get_net(net));
1da177e4 952 }
a79af59e 953
2e4afe7b 954 return sk;
1da177e4
LT		 955}
956
957void sk_free(struct sock *sk)
958{
959 struct sk_filter *filter;
1da177e4
LT		 960
961 if (sk->sk_destruct)
962 sk->sk_destruct(sk);
963
fda9ef5d 964 filter = rcu_dereference(sk->sk_filter);
1da177e4 965 if (filter) {
309dd5fc 966 sk_filter_uncharge(sk, filter);
fda9ef5d 967 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 968 }
969
970 sock_disable_timestamp(sk);
971
972 if (atomic_read(&sk->sk_omem_alloc))
973 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 974 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 975
3b1e0a65 976 put_net(sock_net(sk));
c308c1b2 977 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4
LT		 978}
979
edf02087
DL		 980/*
981 * Last sock_put should drop referrence to sk->sk_net. It has already
982 * been dropped in sk_change_net. Taking referrence to stopping namespace
983 * is not an option.
984 * Take referrence to a socket to remove it from hash _alive_ and after that
985 * destroy it in the context of init_net.
986 */
987void sk_release_kernel(struct sock *sk)
988{
989 if (sk == NULL || sk->sk_socket == NULL)
990 return;
991
992 sock_hold(sk);
993 sock_release(sk->sk_socket);
65a18ec5 994 release_net(sock_net(sk));
3b1e0a65 995 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 996 sock_put(sk);
997}
45af1754 998EXPORT_SYMBOL(sk_release_kernel);
edf02087 999
dd0fc66f 1000struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1001{
8fd1d178 1002 struct sock *newsk;
87d11ceb 1003
8fd1d178 1004 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1005 if (newsk != NULL) {
1006 struct sk_filter *filter;
1007
892c141e 1008 sock_copy(newsk, sk);
87d11ceb
ACM		 1009
1010 /* SANITY */
3b1e0a65 1011 get_net(sock_net(newsk));
87d11ceb
ACM		 1012 sk_node_init(&newsk->sk_node);
1013 sock_lock_init(newsk);
1014 bh_lock_sock(newsk);
fa438ccf 1015 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
87d11ceb
ACM		 1016
1017 atomic_set(&newsk->sk_rmem_alloc, 0);
1018 atomic_set(&newsk->sk_wmem_alloc, 0);
1019 atomic_set(&newsk->sk_omem_alloc, 0);
1020 skb_queue_head_init(&newsk->sk_receive_queue);
1021 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1022#ifdef CONFIG_NET_DMA
1023 skb_queue_head_init(&newsk->sk_async_wait_queue);
1024#endif
87d11ceb
ACM		 1025
1026 rwlock_init(&newsk->sk_dst_lock);
1027 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1028 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1029 af_callback_keys + newsk->sk_family,
1030 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1031
1032 newsk->sk_dst_cache = NULL;
1033 newsk->sk_wmem_queued = 0;
1034 newsk->sk_forward_alloc = 0;
1035 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1036 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1037
1038 sock_reset_flag(newsk, SOCK_DONE);
1039 skb_queue_head_init(&newsk->sk_error_queue);
1040
1041 filter = newsk->sk_filter;
1042 if (filter != NULL)
1043 sk_filter_charge(newsk, filter);
1044
1045 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1046 /* It is still raw copy of parent, so invalidate
1047 * destructor and make plain sk_free() */
1048 newsk->sk_destruct = NULL;
1049 sk_free(newsk);
1050 newsk = NULL;
1051 goto out;
1052 }
1053
1054 newsk->sk_err = 0;
1055 newsk->sk_priority = 0;
1056 atomic_set(&newsk->sk_refcnt, 2);
1057
1058 /*
1059 * Increment the counter in the same struct proto as the master
1060 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1061 * is the same as sk->sk_prot->socks, as this field was copied
1062 * with memcpy).
1063 *
1064 * This _changes_ the previous behaviour, where
1065 * tcp_create_openreq_child always was incrementing the
1066 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1067 * to be taken into account in all callers. -acme
1068 */
1069 sk_refcnt_debug_inc(newsk);
972692e0 1070 sk_set_socket(newsk, NULL);
87d11ceb
ACM		 1071 newsk->sk_sleep = NULL;
1072
1073 if (newsk->sk_prot->sockets_allocated)
1074 atomic_inc(newsk->sk_prot->sockets_allocated);
1075 }
1076out:
1077 return newsk;
1078}
1079
1080EXPORT_SYMBOL_GPL(sk_clone);
1081
9958089a
AK		 1082void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1083{
1084 __sk_dst_set(sk, dst);
1085 sk->sk_route_caps = dst->dev->features;
1086 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1087 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
9958089a 1088 if (sk_can_gso(sk)) {
82cc1a7a 1089 if (dst->header_len) {
9958089a 1090 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1091 } else {
9958089a 1092 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1093 sk->sk_gso_max_size = dst->dev->gso_max_size;
1094 }
9958089a
AK		 1095 }
1096}
1097EXPORT_SYMBOL_GPL(sk_setup_caps);
1098
1da177e4
LT		 1099void __init sk_init(void)
1100{
1101 if (num_physpages <= 4096) {
1102 sysctl_wmem_max = 32767;
1103 sysctl_rmem_max = 32767;
1104 sysctl_wmem_default = 32767;
1105 sysctl_rmem_default = 32767;
1106 } else if (num_physpages >= 131072) {
1107 sysctl_wmem_max = 131071;
1108 sysctl_rmem_max = 131071;
1109 }
1110}
1111
1112/*
1113 * Simple resource managers for sockets.
1114 */
1115
1116
4ec93edb
YH		 1117/*
1118 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1119 */
1120void sock_wfree(struct sk_buff *skb)
1121{
1122 struct sock *sk = skb->sk;
1123
1124 /* In case it might be waiting for more memory. */
1125 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1126 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1127 sk->sk_write_space(sk);
1128 sock_put(sk);
1129}
1130
4ec93edb
YH		 1131/*
1132 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1133 */
1134void sock_rfree(struct sk_buff *skb)
1135{
1136 struct sock *sk = skb->sk;
1137
3ab224be 1138 skb_truesize_check(skb);
1da177e4 1139 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1140 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4
LT		 1141}
1142
1143
1144int sock_i_uid(struct sock *sk)
1145{
1146 int uid;
1147
1148 read_lock(&sk->sk_callback_lock);
1149 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1150 read_unlock(&sk->sk_callback_lock);
1151 return uid;
1152}
1153
1154unsigned long sock_i_ino(struct sock *sk)
1155{
1156 unsigned long ino;
1157
1158 read_lock(&sk->sk_callback_lock);
1159 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1160 read_unlock(&sk->sk_callback_lock);
1161 return ino;
1162}
1163
1164/*
1165 * Allocate a skb from the socket's send buffer.
1166 */
86a76caf 1167struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1168 gfp_t priority)
1da177e4
LT		 1169{
1170 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1171 struct sk_buff * skb = alloc_skb(size, priority);
1172 if (skb) {
1173 skb_set_owner_w(skb, sk);
1174 return skb;
1175 }
1176 }
1177 return NULL;
1178}
1179
1180/*
1181 * Allocate a skb from the socket's receive buffer.
4ec93edb 1182 */
86a76caf 1183struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1184 gfp_t priority)
1da177e4
LT		 1185{
1186 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1187 struct sk_buff *skb = alloc_skb(size, priority);
1188 if (skb) {
1189 skb_set_owner_r(skb, sk);
1190 return skb;
1191 }
1192 }
1193 return NULL;
1194}
1195
4ec93edb 1196/*
1da177e4 1197 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1198 */
dd0fc66f 1199void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1200{
1201 if ((unsigned)size <= sysctl_optmem_max &&
1202 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1203 void *mem;
1204 /* First do the add, to avoid the race if kmalloc
4ec93edb 1205 * might sleep.
1da177e4
LT		 1206 */
1207 atomic_add(size, &sk->sk_omem_alloc);
1208 mem = kmalloc(size, priority);
1209 if (mem)
1210 return mem;
1211 atomic_sub(size, &sk->sk_omem_alloc);
1212 }
1213 return NULL;
1214}
1215
1216/*
1217 * Free an option memory block.
1218 */
1219void sock_kfree_s(struct sock *sk, void *mem, int size)
1220{
1221 kfree(mem);
1222 atomic_sub(size, &sk->sk_omem_alloc);
1223}
1224
1225/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1226 I think, these locks should be removed for datagram sockets.
1227 */
1228static long sock_wait_for_wmem(struct sock * sk, long timeo)
1229{
1230 DEFINE_WAIT(wait);
1231
1232 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1233 for (;;) {
1234 if (!timeo)
1235 break;
1236 if (signal_pending(current))
1237 break;
1238 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1239 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1240 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1241 break;
1242 if (sk->sk_shutdown & SEND_SHUTDOWN)
1243 break;
1244 if (sk->sk_err)
1245 break;
1246 timeo = schedule_timeout(timeo);
1247 }
1248 finish_wait(sk->sk_sleep, &wait);
1249 return timeo;
1250}
1251
1252
1253/*
1254 * Generic send/receive buffer handlers
1255 */
1256
1257static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1258 unsigned long header_len,
1259 unsigned long data_len,
1260 int noblock, int *errcode)
1261{
1262 struct sk_buff *skb;
7d877f3b 1263 gfp_t gfp_mask;
1da177e4
LT		 1264 long timeo;
1265 int err;
1266
1267 gfp_mask = sk->sk_allocation;
1268 if (gfp_mask & __GFP_WAIT)
1269 gfp_mask |= __GFP_REPEAT;
1270
1271 timeo = sock_sndtimeo(sk, noblock);
1272 while (1) {
1273 err = sock_error(sk);
1274 if (err != 0)
1275 goto failure;
1276
1277 err = -EPIPE;
1278 if (sk->sk_shutdown & SEND_SHUTDOWN)
1279 goto failure;
1280
1281 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1282 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1283 if (skb) {
1284 int npages;
1285 int i;
1286
1287 /* No pages, we're done... */
1288 if (!data_len)
1289 break;
1290
1291 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1292 skb->truesize += data_len;
1293 skb_shinfo(skb)->nr_frags = npages;
1294 for (i = 0; i < npages; i++) {
1295 struct page *page;
1296 skb_frag_t *frag;
1297
1298 page = alloc_pages(sk->sk_allocation, 0);
1299 if (!page) {
1300 err = -ENOBUFS;
1301 skb_shinfo(skb)->nr_frags = i;
1302 kfree_skb(skb);
1303 goto failure;
1304 }
1305
1306 frag = &skb_shinfo(skb)->frags[i];
1307 frag->page = page;
1308 frag->page_offset = 0;
1309 frag->size = (data_len >= PAGE_SIZE ?
1310 PAGE_SIZE :
1311 data_len);
1312 data_len -= PAGE_SIZE;
1313 }
1314
1315 /* Full success... */
1316 break;
1317 }
1318 err = -ENOBUFS;
1319 goto failure;
1320 }
1321 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1322 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1323 err = -EAGAIN;
1324 if (!timeo)
1325 goto failure;
1326 if (signal_pending(current))
1327 goto interrupted;
1328 timeo = sock_wait_for_wmem(sk, timeo);
1329 }
1330
1331 skb_set_owner_w(skb, sk);
1332 return skb;
1333
1334interrupted:
1335 err = sock_intr_errno(timeo);
1336failure:
1337 *errcode = err;
1338 return NULL;
1339}
1340
4ec93edb 1341struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1342 int noblock, int *errcode)
1343{
1344 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1345}
1346
1347static void __lock_sock(struct sock *sk)
1348{
1349 DEFINE_WAIT(wait);
1350
e71a4783 1351 for (;;) {
1da177e4
LT		 1352 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1353 TASK_UNINTERRUPTIBLE);
1354 spin_unlock_bh(&sk->sk_lock.slock);
1355 schedule();
1356 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1357 if (!sock_owned_by_user(sk))
1da177e4
LT		 1358 break;
1359 }
1360 finish_wait(&sk->sk_lock.wq, &wait);
1361}
1362
1363static void __release_sock(struct sock *sk)
1364{
1365 struct sk_buff *skb = sk->sk_backlog.head;
1366
1367 do {
1368 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1369 bh_unlock_sock(sk);
1370
1371 do {
1372 struct sk_buff *next = skb->next;
1373
1374 skb->next = NULL;
c57943a1 1375 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1376
1377 /*
1378 * We are in process context here with softirqs
1379 * disabled, use cond_resched_softirq() to preempt.
1380 * This is safe to do because we've taken the backlog
1381 * queue private:
1382 */
1383 cond_resched_softirq();
1384
1385 skb = next;
1386 } while (skb != NULL);
1387
1388 bh_lock_sock(sk);
e71a4783 1389 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1390}
1391
1392/**
1393 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1394 * @sk: sock to wait on
1395 * @timeo: for how long
1da177e4
LT		 1396 *
1397 * Now socket state including sk->sk_err is changed only under lock,
1398 * hence we may omit checks after joining wait queue.
1399 * We check receive queue before schedule() only as optimization;
1400 * it is very likely that release_sock() added new data.
1401 */
1402int sk_wait_data(struct sock *sk, long *timeo)
1403{
1404 int rc;
1405 DEFINE_WAIT(wait);
1406
1407 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1408 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1409 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1410 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1411 finish_wait(sk->sk_sleep, &wait);
1412 return rc;
1413}
1414
1415EXPORT_SYMBOL(sk_wait_data);
1416
3ab224be
HA		 1417/**
1418 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1419 * @sk: socket
1420 * @size: memory size to allocate
1421 * @kind: allocation type
1422 *
1423 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1424 * rmem allocation. This function assumes that protocols which have
1425 * memory_pressure use sk_wmem_queued as write buffer accounting.
1426 */
1427int __sk_mem_schedule(struct sock *sk, int size, int kind)
1428{
1429 struct proto *prot = sk->sk_prot;
1430 int amt = sk_mem_pages(size);
1431 int allocated;
1432
1433 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1434 allocated = atomic_add_return(amt, prot->memory_allocated);
1435
1436 /* Under limit. */
1437 if (allocated <= prot->sysctl_mem[0]) {
1438 if (prot->memory_pressure && *prot->memory_pressure)
1439 *prot->memory_pressure = 0;
1440 return 1;
1441 }
1442
1443 /* Under pressure. */
1444 if (allocated > prot->sysctl_mem[1])
1445 if (prot->enter_memory_pressure)
5c52ba17 1446 prot->enter_memory_pressure(sk);
3ab224be
HA		 1447
1448 /* Over hard limit. */
1449 if (allocated > prot->sysctl_mem[2])
1450 goto suppress_allocation;
1451
1452 /* guarantee minimum buffer size under pressure */
1453 if (kind == SK_MEM_RECV) {
1454 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1455 return 1;
1456 } else { /* SK_MEM_SEND */
1457 if (sk->sk_type == SOCK_STREAM) {
1458 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1459 return 1;
1460 } else if (atomic_read(&sk->sk_wmem_alloc) <
1461 prot->sysctl_wmem[0])
1462 return 1;
1463 }
1464
1465 if (prot->memory_pressure) {
1466 if (!*prot->memory_pressure ||
1467 prot->sysctl_mem[2] > atomic_read(prot->sockets_allocated) *
1468 sk_mem_pages(sk->sk_wmem_queued +
1469 atomic_read(&sk->sk_rmem_alloc) +
1470 sk->sk_forward_alloc))
1471 return 1;
1472 }
1473
1474suppress_allocation:
1475
1476 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1477 sk_stream_moderate_sndbuf(sk);
1478
1479 /* Fail only if socket is _under_ its sndbuf.
1480 * In this case we cannot block, so that we have to fail.
1481 */
1482 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1483 return 1;
1484 }
1485
1486 /* Alas. Undo changes. */
1487 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1488 atomic_sub(amt, prot->memory_allocated);
1489 return 0;
1490}
1491
1492EXPORT_SYMBOL(__sk_mem_schedule);
1493
1494/**
1495 * __sk_reclaim - reclaim memory_allocated
1496 * @sk: socket
1497 */
1498void __sk_mem_reclaim(struct sock *sk)
1499{
1500 struct proto *prot = sk->sk_prot;
1501
680a5a50 1502 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1503 prot->memory_allocated);
1504 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1505
1506 if (prot->memory_pressure && *prot->memory_pressure &&
1507 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1508 *prot->memory_pressure = 0;
1509}
1510
1511EXPORT_SYMBOL(__sk_mem_reclaim);
1512
1513
1da177e4
LT		 1514/*
1515 * Set of default routines for initialising struct proto_ops when
1516 * the protocol does not support a particular function. In certain
1517 * cases where it makes no sense for a protocol to have a "do nothing"
1518 * function, some default processing is provided.
1519 */
1520
1521int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1522{
1523 return -EOPNOTSUPP;
1524}
1525
4ec93edb 1526int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1527 int len, int flags)
1528{
1529 return -EOPNOTSUPP;
1530}
1531
1532int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1533{
1534 return -EOPNOTSUPP;
1535}
1536
1537int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1538{
1539 return -EOPNOTSUPP;
1540}
1541
4ec93edb 1542int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1543 int *len, int peer)
1544{
1545 return -EOPNOTSUPP;
1546}
1547
1548unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1549{
1550 return 0;
1551}
1552
1553int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1554{
1555 return -EOPNOTSUPP;
1556}
1557
1558int sock_no_listen(struct socket *sock, int backlog)
1559{
1560 return -EOPNOTSUPP;
1561}
1562
1563int sock_no_shutdown(struct socket *sock, int how)
1564{
1565 return -EOPNOTSUPP;
1566}
1567
1568int sock_no_setsockopt(struct socket *sock, int level, int optname,
1569 char __user *optval, int optlen)
1570{
1571 return -EOPNOTSUPP;
1572}
1573
1574int sock_no_getsockopt(struct socket *sock, int level, int optname,
1575 char __user *optval, int __user *optlen)
1576{
1577 return -EOPNOTSUPP;
1578}
1579
1580int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1581 size_t len)
1582{
1583 return -EOPNOTSUPP;
1584}
1585
1586int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1587 size_t len, int flags)
1588{
1589 return -EOPNOTSUPP;
1590}
1591
1592int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1593{
1594 /* Mirror missing mmap method error code */
1595 return -ENODEV;
1596}
1597
1598ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1599{
1600 ssize_t res;
1601 struct msghdr msg = {.msg_flags = flags};
1602 struct kvec iov;
1603 char *kaddr = kmap(page);
1604 iov.iov_base = kaddr + offset;
1605 iov.iov_len = size;
1606 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1607 kunmap(page);
1608 return res;
1609}
1610
1611/*
1612 * Default Socket Callbacks
1613 */
1614
1615static void sock_def_wakeup(struct sock *sk)
1616{
1617 read_lock(&sk->sk_callback_lock);
1618 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1619 wake_up_interruptible_all(sk->sk_sleep);
1620 read_unlock(&sk->sk_callback_lock);
1621}
1622
1623static void sock_def_error_report(struct sock *sk)
1624{
1625 read_lock(&sk->sk_callback_lock);
1626 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1627 wake_up_interruptible(sk->sk_sleep);
8d8ad9d7 1628 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1da177e4
LT		 1629 read_unlock(&sk->sk_callback_lock);
1630}
1631
1632static void sock_def_readable(struct sock *sk, int len)
1633{
1634 read_lock(&sk->sk_callback_lock);
1635 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
6f3d0929 1636 wake_up_interruptible_sync(sk->sk_sleep);
8d8ad9d7 1637 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1da177e4
LT		 1638 read_unlock(&sk->sk_callback_lock);
1639}
1640
1641static void sock_def_write_space(struct sock *sk)
1642{
1643 read_lock(&sk->sk_callback_lock);
1644
1645 /* Do not wake up a writer until he can make "significant"
1646 * progress. --DaveM
1647 */
e71a4783 1648 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1da177e4 1649 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
6f3d0929 1650 wake_up_interruptible_sync(sk->sk_sleep);
1da177e4
LT		 1651
1652 /* Should agree with poll, otherwise some programs break */
1653 if (sock_writeable(sk))
8d8ad9d7 1654 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1655 }
1656
1657 read_unlock(&sk->sk_callback_lock);
1658}
1659
1660static void sock_def_destruct(struct sock *sk)
1661{
a51482bd 1662 kfree(sk->sk_protinfo);
1da177e4
LT		 1663}
1664
1665void sk_send_sigurg(struct sock *sk)
1666{
1667 if (sk->sk_socket && sk->sk_socket->file)
1668 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1669 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4
LT		 1670}
1671
1672void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1673 unsigned long expires)
1674{
1675 if (!mod_timer(timer, expires))
1676 sock_hold(sk);
1677}
1678
1679EXPORT_SYMBOL(sk_reset_timer);
1680
1681void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1682{
1683 if (timer_pending(timer) && del_timer(timer))
1684 __sock_put(sk);
1685}
1686
1687EXPORT_SYMBOL(sk_stop_timer);
1688
1689void sock_init_data(struct socket *sock, struct sock *sk)
1690{
1691 skb_queue_head_init(&sk->sk_receive_queue);
1692 skb_queue_head_init(&sk->sk_write_queue);
1693 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1694#ifdef CONFIG_NET_DMA
1695 skb_queue_head_init(&sk->sk_async_wait_queue);
1696#endif
1da177e4
LT		 1697
1698 sk->sk_send_head = NULL;
1699
1700 init_timer(&sk->sk_timer);
4ec93edb 1701
1da177e4
LT		 1702 sk->sk_allocation = GFP_KERNEL;
1703 sk->sk_rcvbuf = sysctl_rmem_default;
1704 sk->sk_sndbuf = sysctl_wmem_default;
1705 sk->sk_state = TCP_CLOSE;
972692e0 1706 sk_set_socket(sk, sock);
1da177e4
LT		 1707
1708 sock_set_flag(sk, SOCK_ZAPPED);
1709
e71a4783 1710 if (sock) {
1da177e4
LT		 1711 sk->sk_type = sock->type;
1712 sk->sk_sleep = &sock->wait;
1713 sock->sk = sk;
1714 } else
1715 sk->sk_sleep = NULL;
1716
1717 rwlock_init(&sk->sk_dst_lock);
1718 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1719 lockdep_set_class_and_name(&sk->sk_callback_lock,
1720 af_callback_keys + sk->sk_family,
1721 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1722
1723 sk->sk_state_change = sock_def_wakeup;
1724 sk->sk_data_ready = sock_def_readable;
1725 sk->sk_write_space = sock_def_write_space;
1726 sk->sk_error_report = sock_def_error_report;
1727 sk->sk_destruct = sock_def_destruct;
1728
1729 sk->sk_sndmsg_page = NULL;
1730 sk->sk_sndmsg_off = 0;
1731
1732 sk->sk_peercred.pid = 0;
1733 sk->sk_peercred.uid = -1;
1734 sk->sk_peercred.gid = -1;
1735 sk->sk_write_pending = 0;
1736 sk->sk_rcvlowat = 1;
1737 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1738 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1739
f37f0afb 1740 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4
LT		 1741
1742 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1743 atomic_set(&sk->sk_drops, 0);
1da177e4
LT		 1744}
1745
b5606c2d 1746void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1747{
1748 might_sleep();
a5b5bb9a 1749 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1750 if (sk->sk_lock.owned)
1da177e4 1751 __lock_sock(sk);
d2e9117c 1752 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1753 spin_unlock(&sk->sk_lock.slock);
1754 /*
1755 * The sk_lock has mutex_lock() semantics here:
1756 */
fcc70d5f 1757 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1758 local_bh_enable();
1da177e4
LT		 1759}
1760
fcc70d5f 1761EXPORT_SYMBOL(lock_sock_nested);
1da177e4 1762
b5606c2d 1763void release_sock(struct sock *sk)
1da177e4 1764{
a5b5bb9a
IM		 1765 /*
1766 * The sk_lock has mutex_unlock() semantics:
1767 */
1768 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1769
1770 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1771 if (sk->sk_backlog.tail)
1772 __release_sock(sk);
d2e9117c 1773 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1774 if (waitqueue_active(&sk->sk_lock.wq))
1775 wake_up(&sk->sk_lock.wq);
1776 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1777}
1778EXPORT_SYMBOL(release_sock);
1779
1780int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1781{
b7aa0bf7 1782 struct timeval tv;
1da177e4
LT		 1783 if (!sock_flag(sk, SOCK_TIMESTAMP))
1784 sock_enable_timestamp(sk);
b7aa0bf7
ED		 1785 tv = ktime_to_timeval(sk->sk_stamp);
1786 if (tv.tv_sec == -1)
1da177e4 1787 return -ENOENT;
b7aa0bf7
ED		 1788 if (tv.tv_sec == 0) {
1789 sk->sk_stamp = ktime_get_real();
1790 tv = ktime_to_timeval(sk->sk_stamp);
1791 }
1792 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1793}
1da177e4
LT		 1794EXPORT_SYMBOL(sock_get_timestamp);
1795
ae40eb1e
ED		 1796int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1797{
1798 struct timespec ts;
1799 if (!sock_flag(sk, SOCK_TIMESTAMP))
1800 sock_enable_timestamp(sk);
1801 ts = ktime_to_timespec(sk->sk_stamp);
1802 if (ts.tv_sec == -1)
1803 return -ENOENT;
1804 if (ts.tv_sec == 0) {
1805 sk->sk_stamp = ktime_get_real();
1806 ts = ktime_to_timespec(sk->sk_stamp);
1807 }
1808 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1809}
1810EXPORT_SYMBOL(sock_get_timestampns);
1811
1da177e4 1812void sock_enable_timestamp(struct sock *sk)
4ec93edb
YH		 1813{
1814 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 1815 sock_set_flag(sk, SOCK_TIMESTAMP);
1816 net_enable_timestamp();
1817 }
1818}
1da177e4
LT		 1819
1820/*
1821 * Get a socket option on an socket.
1822 *
1823 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1824 * asynchronous errors should be reported by getsockopt. We assume
1825 * this means if you specify SO_ERROR (otherwise whats the point of it).
1826 */
1827int sock_common_getsockopt(struct socket *sock, int level, int optname,
1828 char __user *optval, int __user *optlen)
1829{
1830 struct sock *sk = sock->sk;
1831
1832 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1833}
1834
1835EXPORT_SYMBOL(sock_common_getsockopt);
1836
3fdadf7d 1837#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1838int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1839 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1840{
1841 struct sock *sk = sock->sk;
1842
1e51f951 1843 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 1844 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1845 optval, optlen);
3fdadf7d
DM		 1846 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1847}
1848EXPORT_SYMBOL(compat_sock_common_getsockopt);
1849#endif
1850
1da177e4
LT		 1851int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1852 struct msghdr *msg, size_t size, int flags)
1853{
1854 struct sock *sk = sock->sk;
1855 int addr_len = 0;
1856 int err;
1857
1858 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1859 flags & ~MSG_DONTWAIT, &addr_len);
1860 if (err >= 0)
1861 msg->msg_namelen = addr_len;
1862 return err;
1863}
1864
1865EXPORT_SYMBOL(sock_common_recvmsg);
1866
1867/*
1868 * Set socket options on an inet socket.
1869 */
1870int sock_common_setsockopt(struct socket *sock, int level, int optname,
1871 char __user *optval, int optlen)
1872{
1873 struct sock *sk = sock->sk;
1874
1875 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1876}
1877
1878EXPORT_SYMBOL(sock_common_setsockopt);
1879
3fdadf7d 1880#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1881int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1882 char __user *optval, int optlen)
3fdadf7d
DM		 1883{
1884 struct sock *sk = sock->sk;
1885
543d9cfe
ACM		 1886 if (sk->sk_prot->compat_setsockopt != NULL)
1887 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1888 optval, optlen);
3fdadf7d
DM		 1889 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1890}
1891EXPORT_SYMBOL(compat_sock_common_setsockopt);
1892#endif
1893
1da177e4
LT		 1894void sk_common_release(struct sock *sk)
1895{
1896 if (sk->sk_prot->destroy)
1897 sk->sk_prot->destroy(sk);
1898
1899 /*
1900 * Observation: when sock_common_release is called, processes have
1901 * no access to socket. But net still has.
1902 * Step one, detach it from networking:
1903 *
1904 * A. Remove from hash tables.
1905 */
1906
1907 sk->sk_prot->unhash(sk);
1908
1909 /*
1910 * In this point socket cannot receive new packets, but it is possible
1911 * that some packets are in flight because some CPU runs receiver and
1912 * did hash table lookup before we unhashed socket. They will achieve
1913 * receive queue and will be purged by socket destructor.
1914 *
1915 * Also we still have packets pending on receive queue and probably,
1916 * our own packets waiting in device queues. sock_destroy will drain
1917 * receive queue, but transmitted packets will delay socket destruction
1918 * until the last reference will be released.
1919 */
1920
1921 sock_orphan(sk);
1922
1923 xfrm_sk_free_policy(sk);
1924
e6848976 1925 sk_refcnt_debug_release(sk);
1da177e4
LT		 1926 sock_put(sk);
1927}
1928
1929EXPORT_SYMBOL(sk_common_release);
1930
1931static DEFINE_RWLOCK(proto_list_lock);
1932static LIST_HEAD(proto_list);
1933
13ff3d6f
PE		 1934#ifdef CONFIG_PROC_FS
1935#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 1936struct prot_inuse {
1937 int val[PROTO_INUSE_NR];
1938};
13ff3d6f
PE		 1939
1940static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 1941
1942#ifdef CONFIG_NET_NS
1943void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1944{
1945 int cpu = smp_processor_id();
1946 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
1947}
1948EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
1949
1950int sock_prot_inuse_get(struct net *net, struct proto *prot)
1951{
1952 int cpu, idx = prot->inuse_idx;
1953 int res = 0;
1954
1955 for_each_possible_cpu(cpu)
1956 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
1957
1958 return res >= 0 ? res : 0;
1959}
1960EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
1961
1962static int sock_inuse_init_net(struct net *net)
1963{
1964 net->core.inuse = alloc_percpu(struct prot_inuse);
1965 return net->core.inuse ? 0 : -ENOMEM;
1966}
1967
1968static void sock_inuse_exit_net(struct net *net)
1969{
1970 free_percpu(net->core.inuse);
1971}
1972
1973static struct pernet_operations net_inuse_ops = {
1974 .init = sock_inuse_init_net,
1975 .exit = sock_inuse_exit_net,
1976};
1977
1978static __init int net_inuse_init(void)
1979{
1980 if (register_pernet_subsys(&net_inuse_ops))
1981 panic("Cannot initialize net inuse counters");
1982
1983 return 0;
1984}
1985
1986core_initcall(net_inuse_init);
1987#else
1338d466
PE		 1988static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
1989
c29a0bc4 1990void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466
PE		 1991{
1992 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
1993}
1994EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
1995
c29a0bc4 1996int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 1997{
1998 int cpu, idx = prot->inuse_idx;
1999 int res = 0;
2000
2001 for_each_possible_cpu(cpu)
2002 res += per_cpu(prot_inuse, cpu).val[idx];
2003
2004 return res >= 0 ? res : 0;
2005}
2006EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2007#endif
13ff3d6f
PE		 2008
2009static void assign_proto_idx(struct proto *prot)
2010{
2011 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2012
2013 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2014 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2015 return;
2016 }
2017
2018 set_bit(prot->inuse_idx, proto_inuse_idx);
2019}
2020
2021static void release_proto_idx(struct proto *prot)
2022{
2023 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2024 clear_bit(prot->inuse_idx, proto_inuse_idx);
2025}
2026#else
2027static inline void assign_proto_idx(struct proto *prot)
2028{
2029}
2030
2031static inline void release_proto_idx(struct proto *prot)
2032{
2033}
2034#endif
2035
b733c007
PE		 2036int proto_register(struct proto *prot, int alloc_slab)
2037{
2038 char *request_sock_slab_name = NULL;
2039 char *timewait_sock_slab_name;
2040
1da177e4
LT		 2041 if (alloc_slab) {
2042 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2043 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2044 NULL);
1da177e4
LT		 2045
2046 if (prot->slab == NULL) {
2047 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2048 prot->name);
60e7663d 2049 goto out;
1da177e4 2050 }
2e6599cb
ACM		 2051
2052 if (prot->rsk_prot != NULL) {
2053 static const char mask[] = "request_sock_%s";
2054
2055 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2056 if (request_sock_slab_name == NULL)
2057 goto out_free_sock_slab;
2058
2059 sprintf(request_sock_slab_name, mask, prot->name);
2060 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
2061 prot->rsk_prot->obj_size, 0,
20c2df83 2062 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2063
2064 if (prot->rsk_prot->slab == NULL) {
2065 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2066 prot->name);
2067 goto out_free_request_sock_slab_name;
2068 }
2069 }
8feaf0c0 2070
6d6ee43e 2071 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 2072 static const char mask[] = "tw_sock_%s";
2073
2074 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2075
2076 if (timewait_sock_slab_name == NULL)
2077 goto out_free_request_sock_slab;
2078
2079 sprintf(timewait_sock_slab_name, mask, prot->name);
6d6ee43e
ACM		 2080 prot->twsk_prot->twsk_slab =
2081 kmem_cache_create(timewait_sock_slab_name,
2082 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2083 0,
2084 SLAB_HWCACHE_ALIGN |
2085 prot->slab_flags,
20c2df83 2086 NULL);
6d6ee43e 2087 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2088 goto out_free_timewait_sock_slab_name;
2089 }
1da177e4
LT		 2090 }
2091
2a278051 2092 write_lock(&proto_list_lock);
1da177e4 2093 list_add(&prot->node, &proto_list);
13ff3d6f 2094 assign_proto_idx(prot);
1da177e4 2095 write_unlock(&proto_list_lock);
b733c007
PE		 2096 return 0;
2097
8feaf0c0
ACM		 2098out_free_timewait_sock_slab_name:
2099 kfree(timewait_sock_slab_name);
2100out_free_request_sock_slab:
2101 if (prot->rsk_prot && prot->rsk_prot->slab) {
2102 kmem_cache_destroy(prot->rsk_prot->slab);
2103 prot->rsk_prot->slab = NULL;
2104 }
2e6599cb
ACM		 2105out_free_request_sock_slab_name:
2106 kfree(request_sock_slab_name);
2107out_free_sock_slab:
2108 kmem_cache_destroy(prot->slab);
2109 prot->slab = NULL;
b733c007
PE		 2110out:
2111 return -ENOBUFS;
1da177e4
LT		 2112}
2113
2114EXPORT_SYMBOL(proto_register);
2115
2116void proto_unregister(struct proto *prot)
2117{
2118 write_lock(&proto_list_lock);
13ff3d6f 2119 release_proto_idx(prot);
0a3f4358
PM		 2120 list_del(&prot->node);
2121 write_unlock(&proto_list_lock);
1da177e4
LT		 2122
2123 if (prot->slab != NULL) {
2124 kmem_cache_destroy(prot->slab);
2125 prot->slab = NULL;
2126 }
2127
2e6599cb
ACM		 2128 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2129 const char *name = kmem_cache_name(prot->rsk_prot->slab);
2130
2131 kmem_cache_destroy(prot->rsk_prot->slab);
2132 kfree(name);
2133 prot->rsk_prot->slab = NULL;
2134 }
2135
6d6ee43e
ACM		 2136 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2137 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
8feaf0c0 2138
6d6ee43e 2139 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
8feaf0c0 2140 kfree(name);
6d6ee43e 2141 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2142 }
1da177e4
LT		 2143}
2144
2145EXPORT_SYMBOL(proto_unregister);
2146
2147#ifdef CONFIG_PROC_FS
1da177e4 2148static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2149 __acquires(proto_list_lock)
1da177e4
LT		 2150{
2151 read_lock(&proto_list_lock);
60f0438a 2152 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2153}
2154
2155static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2156{
60f0438a 2157 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2158}
2159
2160static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2161 __releases(proto_list_lock)
1da177e4
LT		 2162{
2163 read_unlock(&proto_list_lock);
2164}
2165
2166static char proto_method_implemented(const void *method)
2167{
2168 return method == NULL ? 'n' : 'y';
2169}
2170
2171static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2172{
2173 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2174 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2175 proto->name,
2176 proto->obj_size,
14e943db 2177 sock_prot_inuse_get(seq_file_net(seq), proto),
1da177e4
LT		 2178 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2179 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2180 proto->max_header,
2181 proto->slab == NULL ? "no" : "yes",
2182 module_name(proto->owner),
2183 proto_method_implemented(proto->close),
2184 proto_method_implemented(proto->connect),
2185 proto_method_implemented(proto->disconnect),
2186 proto_method_implemented(proto->accept),
2187 proto_method_implemented(proto->ioctl),
2188 proto_method_implemented(proto->init),
2189 proto_method_implemented(proto->destroy),
2190 proto_method_implemented(proto->shutdown),
2191 proto_method_implemented(proto->setsockopt),
2192 proto_method_implemented(proto->getsockopt),
2193 proto_method_implemented(proto->sendmsg),
2194 proto_method_implemented(proto->recvmsg),
2195 proto_method_implemented(proto->sendpage),
2196 proto_method_implemented(proto->bind),
2197 proto_method_implemented(proto->backlog_rcv),
2198 proto_method_implemented(proto->hash),
2199 proto_method_implemented(proto->unhash),
2200 proto_method_implemented(proto->get_port),
2201 proto_method_implemented(proto->enter_memory_pressure));
2202}
2203
2204static int proto_seq_show(struct seq_file *seq, void *v)
2205{
60f0438a 2206 if (v == &proto_list)
1da177e4
LT		 2207 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2208 "protocol",
2209 "size",
2210 "sockets",
2211 "memory",
2212 "press",
2213 "maxhdr",
2214 "slab",
2215 "module",
2216 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2217 else
60f0438a 2218 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2219 return 0;
2220}
2221
f690808e 2222static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2223 .start = proto_seq_start,
2224 .next = proto_seq_next,
2225 .stop = proto_seq_stop,
2226 .show = proto_seq_show,
2227};
2228
2229static int proto_seq_open(struct inode *inode, struct file *file)
2230{
14e943db
ED		 2231 return seq_open_net(inode, file, &proto_seq_ops,
2232 sizeof(struct seq_net_private));
1da177e4
LT		 2233}
2234
9a32144e 2235static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2236 .owner = THIS_MODULE,
2237 .open = proto_seq_open,
2238 .read = seq_read,
2239 .llseek = seq_lseek,
14e943db
ED		 2240 .release = seq_release_net,
2241};
2242
2243static __net_init int proto_init_net(struct net *net)
2244{
2245 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2246 return -ENOMEM;
2247
2248 return 0;
2249}
2250
2251static __net_exit void proto_exit_net(struct net *net)
2252{
2253 proc_net_remove(net, "protocols");
2254}
2255
2256
2257static __net_initdata struct pernet_operations proto_net_ops = {
2258 .init = proto_init_net,
2259 .exit = proto_exit_net,
1da177e4
LT		 2260};
2261
2262static int __init proto_init(void)
2263{
14e943db 2264 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2265}
2266
2267subsys_initcall(proto_init);
2268
2269#endif /* PROC_FS */
2270
2271EXPORT_SYMBOL(sk_alloc);
2272EXPORT_SYMBOL(sk_free);
2273EXPORT_SYMBOL(sk_send_sigurg);
2274EXPORT_SYMBOL(sock_alloc_send_skb);
2275EXPORT_SYMBOL(sock_init_data);
2276EXPORT_SYMBOL(sock_kfree_s);
2277EXPORT_SYMBOL(sock_kmalloc);
2278EXPORT_SYMBOL(sock_no_accept);
2279EXPORT_SYMBOL(sock_no_bind);
2280EXPORT_SYMBOL(sock_no_connect);
2281EXPORT_SYMBOL(sock_no_getname);
2282EXPORT_SYMBOL(sock_no_getsockopt);
2283EXPORT_SYMBOL(sock_no_ioctl);
2284EXPORT_SYMBOL(sock_no_listen);
2285EXPORT_SYMBOL(sock_no_mmap);
2286EXPORT_SYMBOL(sock_no_poll);
2287EXPORT_SYMBOL(sock_no_recvmsg);
2288EXPORT_SYMBOL(sock_no_sendmsg);
2289EXPORT_SYMBOL(sock_no_sendpage);
2290EXPORT_SYMBOL(sock_no_setsockopt);
2291EXPORT_SYMBOL(sock_no_shutdown);
2292EXPORT_SYMBOL(sock_no_socketpair);
2293EXPORT_SYMBOL(sock_rfree);
2294EXPORT_SYMBOL(sock_setsockopt);
2295EXPORT_SYMBOL(sock_wfree);
2296EXPORT_SYMBOL(sock_wmalloc);
2297EXPORT_SYMBOL(sock_i_uid);
2298EXPORT_SYMBOL(sock_i_ino);
1da177e4 2299EXPORT_SYMBOL(sysctl_optmem_max);
kernel source for telekom puls (alcatel/mediatek)