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[NETNS]: Make icmpv6_sk per namespace.
[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
10 * Version: $Id: sock.c,v 1.117 2002/02/01 22:01:03 davem Exp $
11 *
02c30a84 12 * Authors: Ross Biro
1da177e4
LT		 13 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
14 * Florian La Roche, <flla@stud.uni-sb.de>
15 * Alan Cox, <A.Cox@swansea.ac.uk>
16 *
17 * Fixes:
18 * Alan Cox : Numerous verify_area() problems
19 * Alan Cox : Connecting on a connecting socket
20 * now returns an error for tcp.
21 * Alan Cox : sock->protocol is set correctly.
22 * and is not sometimes left as 0.
23 * Alan Cox : connect handles icmp errors on a
24 * connect properly. Unfortunately there
25 * is a restart syscall nasty there. I
26 * can't match BSD without hacking the C
27 * library. Ideas urgently sought!
28 * Alan Cox : Disallow bind() to addresses that are
29 * not ours - especially broadcast ones!!
30 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
31 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
32 * instead they leave that for the DESTROY timer.
33 * Alan Cox : Clean up error flag in accept
34 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
35 * was buggy. Put a remove_sock() in the handler
36 * for memory when we hit 0. Also altered the timer
4ec93edb 37 * code. The ACK stuff can wait and needs major
1da177e4
LT		 38 * TCP layer surgery.
39 * Alan Cox : Fixed TCP ack bug, removed remove sock
40 * and fixed timer/inet_bh race.
41 * Alan Cox : Added zapped flag for TCP
42 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
43 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
44 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
45 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
46 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
47 * Rick Sladkey : Relaxed UDP rules for matching packets.
48 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
49 * Pauline Middelink : identd support
50 * Alan Cox : Fixed connect() taking signals I think.
51 * Alan Cox : SO_LINGER supported
52 * Alan Cox : Error reporting fixes
53 * Anonymous : inet_create tidied up (sk->reuse setting)
54 * Alan Cox : inet sockets don't set sk->type!
55 * Alan Cox : Split socket option code
56 * Alan Cox : Callbacks
57 * Alan Cox : Nagle flag for Charles & Johannes stuff
58 * Alex : Removed restriction on inet fioctl
59 * Alan Cox : Splitting INET from NET core
60 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
61 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
62 * Alan Cox : Split IP from generic code
63 * Alan Cox : New kfree_skbmem()
64 * Alan Cox : Make SO_DEBUG superuser only.
65 * Alan Cox : Allow anyone to clear SO_DEBUG
66 * (compatibility fix)
67 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
68 * Alan Cox : Allocator for a socket is settable.
69 * Alan Cox : SO_ERROR includes soft errors.
70 * Alan Cox : Allow NULL arguments on some SO_ opts
71 * Alan Cox : Generic socket allocation to make hooks
72 * easier (suggested by Craig Metz).
73 * Michael Pall : SO_ERROR returns positive errno again
74 * Steve Whitehouse: Added default destructor to free
75 * protocol private data.
76 * Steve Whitehouse: Added various other default routines
77 * common to several socket families.
78 * Chris Evans : Call suser() check last on F_SETOWN
79 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
80 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
81 * Andi Kleen : Fix write_space callback
82 * Chris Evans : Security fixes - signedness again
83 * Arnaldo C. Melo : cleanups, use skb_queue_purge
84 *
85 * To Fix:
86 *
87 *
88 * This program is free software; you can redistribute it and/or
89 * modify it under the terms of the GNU General Public License
90 * as published by the Free Software Foundation; either version
91 * 2 of the License, or (at your option) any later version.
92 */
93
4fc268d2 94#include <linux/capability.h>
1da177e4
LT		 95#include <linux/errno.h>
96#include <linux/types.h>
97#include <linux/socket.h>
98#include <linux/in.h>
99#include <linux/kernel.h>
1da177e4
LT		 100#include <linux/module.h>
101#include <linux/proc_fs.h>
102#include <linux/seq_file.h>
103#include <linux/sched.h>
104#include <linux/timer.h>
105#include <linux/string.h>
106#include <linux/sockios.h>
107#include <linux/net.h>
108#include <linux/mm.h>
109#include <linux/slab.h>
110#include <linux/interrupt.h>
111#include <linux/poll.h>
112#include <linux/tcp.h>
113#include <linux/init.h>
a1f8e7f7 114#include <linux/highmem.h>
1da177e4
LT		 115
116#include <asm/uaccess.h>
117#include <asm/system.h>
118
119#include <linux/netdevice.h>
120#include <net/protocol.h>
121#include <linux/skbuff.h>
457c4cbc 122#include <net/net_namespace.h>
2e6599cb 123#include <net/request_sock.h>
1da177e4
LT		 124#include <net/sock.h>
125#include <net/xfrm.h>
126#include <linux/ipsec.h>
127
128#include <linux/filter.h>
129
130#ifdef CONFIG_INET
131#include <net/tcp.h>
132#endif
133
da21f24d
IM		 134/*
135 * Each address family might have different locking rules, so we have
136 * one slock key per address family:
137 */
a5b5bb9a
IM		 138static struct lock_class_key af_family_keys[AF_MAX];
139static struct lock_class_key af_family_slock_keys[AF_MAX];
140
141#ifdef CONFIG_DEBUG_LOCK_ALLOC
142/*
143 * Make lock validator output more readable. (we pre-construct these
144 * strings build-time, so that runtime initialization of socket
145 * locks is fast):
146 */
147static const char *af_family_key_strings[AF_MAX+1] = {
148 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
149 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
150 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
151 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
152 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
153 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
154 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
155 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
156 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 157 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79
DH		 158 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
159 "sk_lock-AF_RXRPC" , "sk_lock-AF_MAX"
a5b5bb9a
IM		 160};
161static const char *af_family_slock_key_strings[AF_MAX+1] = {
162 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
163 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
164 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
165 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
166 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
167 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
168 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
169 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" ,
170 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 171 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79
DH		 172 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
173 "slock-AF_RXRPC" , "slock-AF_MAX"
a5b5bb9a 174};
443aef0e
PZ		 175static const char *af_family_clock_key_strings[AF_MAX+1] = {
176 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
177 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
178 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
179 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
180 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
181 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
182 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
183 "clock-21" , "clock-AF_SNA" , "clock-AF_IRDA" ,
184 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
185 "clock-27" , "clock-28" , "clock-29" ,
e51f802b
DH		 186 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
187 "clock-AF_RXRPC" , "clock-AF_MAX"
443aef0e 188};
a5b5bb9a 189#endif
da21f24d
IM		 190
191/*
192 * sk_callback_lock locking rules are per-address-family,
193 * so split the lock classes by using a per-AF key:
194 */
195static struct lock_class_key af_callback_keys[AF_MAX];
196
1da177e4
LT		 197/* Take into consideration the size of the struct sk_buff overhead in the
198 * determination of these values, since that is non-constant across
199 * platforms. This makes socket queueing behavior and performance
200 * not depend upon such differences.
201 */
202#define _SK_MEM_PACKETS 256
203#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
204#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
205#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
206
207/* Run time adjustable parameters. */
ab32ea5d
BH		 208__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
209__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
210__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
211__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4
LT		 212
213/* Maximal space eaten by iovec or ancilliary data plus some space */
ab32ea5d 214int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
1da177e4
LT		 215
216static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
217{
218 struct timeval tv;
219
220 if (optlen < sizeof(tv))
221 return -EINVAL;
222 if (copy_from_user(&tv, optval, sizeof(tv)))
223 return -EFAULT;
ba78073e
VA		 224 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
225 return -EDOM;
1da177e4 226
ba78073e 227 if (tv.tv_sec < 0) {
6f11df83
AM		 228 static int warned __read_mostly;
229
ba78073e
VA		 230 *timeo_p = 0;
231 if (warned < 10 && net_ratelimit())
232 warned++;
233 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
234 "tries to set negative timeout\n",
ba25f9dc 235 current->comm, task_pid_nr(current));
ba78073e
VA		 236 return 0;
237 }
1da177e4
LT		 238 *timeo_p = MAX_SCHEDULE_TIMEOUT;
239 if (tv.tv_sec == 0 && tv.tv_usec == 0)
240 return 0;
241 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
242 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
243 return 0;
244}
245
246static void sock_warn_obsolete_bsdism(const char *name)
247{
248 static int warned;
249 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 250 if (strcmp(warncomm, current->comm) && warned < 5) {
251 strcpy(warncomm, current->comm);
1da177e4
LT		 252 printk(KERN_WARNING "process `%s' is using obsolete "
253 "%s SO_BSDCOMPAT\n", warncomm, name);
254 warned++;
255 }
256}
257
258static void sock_disable_timestamp(struct sock *sk)
4ec93edb
YH		 259{
260 if (sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 261 sock_reset_flag(sk, SOCK_TIMESTAMP);
262 net_disable_timestamp();
263 }
264}
265
266
f0088a50
DV		 267int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
268{
269 int err = 0;
270 int skb_len;
271
272 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
273 number of warnings when compiling with -W --ANK
274 */
275 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
276 (unsigned)sk->sk_rcvbuf) {
277 err = -ENOMEM;
278 goto out;
279 }
280
fda9ef5d 281 err = sk_filter(sk, skb);
f0088a50
DV		 282 if (err)
283 goto out;
284
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
f0088a50 328 rc = sk->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
881d966b 375 struct net *net = sk->sk_net;
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
453#ifdef SO_DONTLINGER /* Compatibility item... */
a77be819
KM		 454 if (optname == SO_DONTLINGER) {
455 lock_sock(sk);
456 sock_reset_flag(sk, SOCK_LINGER);
457 release_sock(sk);
458 return 0;
1da177e4 459 }
a77be819 460#endif
4ec93edb 461
4878809f
DM		 462 if (optname == SO_BINDTODEVICE)
463 return sock_bindtodevice(sk, optval, optlen);
464
e71a4783
SH		 465 if (optlen < sizeof(int))
466 return -EINVAL;
4ec93edb 467
1da177e4
LT		 468 if (get_user(val, (int __user *)optval))
469 return -EFAULT;
4ec93edb
YH		 470
471 valbool = val?1:0;
1da177e4
LT		 472
473 lock_sock(sk);
474
e71a4783
SH		 475 switch(optname) {
476 case SO_DEBUG:
477 if (val && !capable(CAP_NET_ADMIN)) {
478 ret = -EACCES;
c0ef877b
PE		 479 } else
480 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 481 break;
482 case SO_REUSEADDR:
483 sk->sk_reuse = valbool;
484 break;
485 case SO_TYPE:
486 case SO_ERROR:
487 ret = -ENOPROTOOPT;
488 break;
489 case SO_DONTROUTE:
c0ef877b 490 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 491 break;
492 case SO_BROADCAST:
493 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
494 break;
495 case SO_SNDBUF:
496 /* Don't error on this BSD doesn't and if you think
497 about it this is right. Otherwise apps have to
498 play 'guess the biggest size' games. RCVBUF/SNDBUF
499 are treated in BSD as hints */
500
501 if (val > sysctl_wmem_max)
502 val = sysctl_wmem_max;
b0573dea 503set_sndbuf:
e71a4783
SH		 504 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
505 if ((val * 2) < SOCK_MIN_SNDBUF)
506 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
507 else
508 sk->sk_sndbuf = val * 2;
1da177e4 509
e71a4783
SH		 510 /*
511 * Wake up sending tasks if we
512 * upped the value.
513 */
514 sk->sk_write_space(sk);
515 break;
1da177e4 516
e71a4783
SH		 517 case SO_SNDBUFFORCE:
518 if (!capable(CAP_NET_ADMIN)) {
519 ret = -EPERM;
520 break;
521 }
522 goto set_sndbuf;
b0573dea 523
e71a4783
SH		 524 case SO_RCVBUF:
525 /* Don't error on this BSD doesn't and if you think
526 about it this is right. Otherwise apps have to
527 play 'guess the biggest size' games. RCVBUF/SNDBUF
528 are treated in BSD as hints */
4ec93edb 529
e71a4783
SH		 530 if (val > sysctl_rmem_max)
531 val = sysctl_rmem_max;
b0573dea 532set_rcvbuf:
e71a4783
SH		 533 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
534 /*
535 * We double it on the way in to account for
536 * "struct sk_buff" etc. overhead. Applications
537 * assume that the SO_RCVBUF setting they make will
538 * allow that much actual data to be received on that
539 * socket.
540 *
541 * Applications are unaware that "struct sk_buff" and
542 * other overheads allocate from the receive buffer
543 * during socket buffer allocation.
544 *
545 * And after considering the possible alternatives,
546 * returning the value we actually used in getsockopt
547 * is the most desirable behavior.
548 */
549 if ((val * 2) < SOCK_MIN_RCVBUF)
550 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
551 else
552 sk->sk_rcvbuf = val * 2;
553 break;
554
555 case SO_RCVBUFFORCE:
556 if (!capable(CAP_NET_ADMIN)) {
557 ret = -EPERM;
1da177e4 558 break;
e71a4783
SH		 559 }
560 goto set_rcvbuf;
1da177e4 561
e71a4783 562 case SO_KEEPALIVE:
1da177e4 563#ifdef CONFIG_INET
e71a4783
SH		 564 if (sk->sk_protocol == IPPROTO_TCP)
565 tcp_set_keepalive(sk, valbool);
1da177e4 566#endif
e71a4783
SH		 567 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
568 break;
569
570 case SO_OOBINLINE:
571 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
572 break;
573
574 case SO_NO_CHECK:
575 sk->sk_no_check = valbool;
576 break;
577
578 case SO_PRIORITY:
579 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
580 sk->sk_priority = val;
581 else
582 ret = -EPERM;
583 break;
584
585 case SO_LINGER:
586 if (optlen < sizeof(ling)) {
587 ret = -EINVAL; /* 1003.1g */
1da177e4 588 break;
e71a4783
SH		 589 }
590 if (copy_from_user(&ling,optval,sizeof(ling))) {
591 ret = -EFAULT;
1da177e4 592 break;
e71a4783
SH		 593 }
594 if (!ling.l_onoff)
595 sock_reset_flag(sk, SOCK_LINGER);
596 else {
1da177e4 597#if (BITS_PER_LONG == 32)
e71a4783
SH		 598 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
599 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 600 else
e71a4783
SH		 601#endif
602 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
603 sock_set_flag(sk, SOCK_LINGER);
604 }
605 break;
606
607 case SO_BSDCOMPAT:
608 sock_warn_obsolete_bsdism("setsockopt");
609 break;
610
611 case SO_PASSCRED:
612 if (valbool)
613 set_bit(SOCK_PASSCRED, &sock->flags);
614 else
615 clear_bit(SOCK_PASSCRED, &sock->flags);
616 break;
617
618 case SO_TIMESTAMP:
92f37fd2 619 case SO_TIMESTAMPNS:
e71a4783 620 if (valbool) {
92f37fd2
ED		 621 if (optname == SO_TIMESTAMP)
622 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
623 else
624 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 625 sock_set_flag(sk, SOCK_RCVTSTAMP);
626 sock_enable_timestamp(sk);
92f37fd2 627 } else {
e71a4783 628 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 629 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
630 }
e71a4783
SH		 631 break;
632
633 case SO_RCVLOWAT:
634 if (val < 0)
635 val = INT_MAX;
636 sk->sk_rcvlowat = val ? : 1;
637 break;
638
639 case SO_RCVTIMEO:
640 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
641 break;
642
643 case SO_SNDTIMEO:
644 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
645 break;
1da177e4 646
e71a4783
SH		 647 case SO_ATTACH_FILTER:
648 ret = -EINVAL;
649 if (optlen == sizeof(struct sock_fprog)) {
650 struct sock_fprog fprog;
1da177e4 651
e71a4783
SH		 652 ret = -EFAULT;
653 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 654 break;
e71a4783
SH		 655
656 ret = sk_attach_filter(&fprog, sk);
657 }
658 break;
659
660 case SO_DETACH_FILTER:
55b33325 661 ret = sk_detach_filter(sk);
e71a4783 662 break;
1da177e4 663
e71a4783
SH		 664 case SO_PASSSEC:
665 if (valbool)
666 set_bit(SOCK_PASSSEC, &sock->flags);
667 else
668 clear_bit(SOCK_PASSSEC, &sock->flags);
669 break;
4a19ec58
LAT		 670 case SO_MARK:
671 if (!capable(CAP_NET_ADMIN))
672 ret = -EPERM;
673 else {
674 sk->sk_mark = val;
675 }
676 break;
877ce7c1 677
1da177e4
LT		 678 /* We implement the SO_SNDLOWAT etc to
679 not be settable (1003.1g 5.3) */
e71a4783
SH		 680 default:
681 ret = -ENOPROTOOPT;
682 break;
4ec93edb 683 }
1da177e4
LT		 684 release_sock(sk);
685 return ret;
686}
687
688
689int sock_getsockopt(struct socket *sock, int level, int optname,
690 char __user *optval, int __user *optlen)
691{
692 struct sock *sk = sock->sk;
4ec93edb 693
e71a4783 694 union {
4ec93edb
YH		 695 int val;
696 struct linger ling;
1da177e4
LT		 697 struct timeval tm;
698 } v;
4ec93edb 699
1da177e4
LT		 700 unsigned int lv = sizeof(int);
701 int len;
4ec93edb 702
e71a4783 703 if (get_user(len, optlen))
4ec93edb 704 return -EFAULT;
e71a4783 705 if (len < 0)
1da177e4 706 return -EINVAL;
4ec93edb 707
e71a4783
SH		 708 switch(optname) {
709 case SO_DEBUG:
710 v.val = sock_flag(sk, SOCK_DBG);
711 break;
712
713 case SO_DONTROUTE:
714 v.val = sock_flag(sk, SOCK_LOCALROUTE);
715 break;
716
717 case SO_BROADCAST:
718 v.val = !!sock_flag(sk, SOCK_BROADCAST);
719 break;
720
721 case SO_SNDBUF:
722 v.val = sk->sk_sndbuf;
723 break;
724
725 case SO_RCVBUF:
726 v.val = sk->sk_rcvbuf;
727 break;
728
729 case SO_REUSEADDR:
730 v.val = sk->sk_reuse;
731 break;
732
733 case SO_KEEPALIVE:
734 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
735 break;
736
737 case SO_TYPE:
738 v.val = sk->sk_type;
739 break;
740
741 case SO_ERROR:
742 v.val = -sock_error(sk);
743 if (v.val==0)
744 v.val = xchg(&sk->sk_err_soft, 0);
745 break;
746
747 case SO_OOBINLINE:
748 v.val = !!sock_flag(sk, SOCK_URGINLINE);
749 break;
750
751 case SO_NO_CHECK:
752 v.val = sk->sk_no_check;
753 break;
754
755 case SO_PRIORITY:
756 v.val = sk->sk_priority;
757 break;
758
759 case SO_LINGER:
760 lv = sizeof(v.ling);
761 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
762 v.ling.l_linger = sk->sk_lingertime / HZ;
763 break;
764
765 case SO_BSDCOMPAT:
766 sock_warn_obsolete_bsdism("getsockopt");
767 break;
768
769 case SO_TIMESTAMP:
92f37fd2
ED		 770 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
771 !sock_flag(sk, SOCK_RCVTSTAMPNS);
772 break;
773
774 case SO_TIMESTAMPNS:
775 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 776 break;
777
778 case SO_RCVTIMEO:
779 lv=sizeof(struct timeval);
780 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
781 v.tm.tv_sec = 0;
782 v.tm.tv_usec = 0;
783 } else {
784 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
785 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
786 }
787 break;
788
789 case SO_SNDTIMEO:
790 lv=sizeof(struct timeval);
791 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
792 v.tm.tv_sec = 0;
793 v.tm.tv_usec = 0;
794 } else {
795 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
796 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
797 }
798 break;
1da177e4 799
e71a4783
SH		 800 case SO_RCVLOWAT:
801 v.val = sk->sk_rcvlowat;
802 break;
1da177e4 803
e71a4783
SH		 804 case SO_SNDLOWAT:
805 v.val=1;
806 break;
1da177e4 807
e71a4783
SH		 808 case SO_PASSCRED:
809 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
810 break;
1da177e4 811
e71a4783
SH		 812 case SO_PEERCRED:
813 if (len > sizeof(sk->sk_peercred))
814 len = sizeof(sk->sk_peercred);
815 if (copy_to_user(optval, &sk->sk_peercred, len))
816 return -EFAULT;
817 goto lenout;
1da177e4 818
e71a4783
SH		 819 case SO_PEERNAME:
820 {
821 char address[128];
822
823 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
824 return -ENOTCONN;
825 if (lv < len)
826 return -EINVAL;
827 if (copy_to_user(optval, address, len))
828 return -EFAULT;
829 goto lenout;
830 }
1da177e4 831
e71a4783
SH		 832 /* Dubious BSD thing... Probably nobody even uses it, but
833 * the UNIX standard wants it for whatever reason... -DaveM
834 */
835 case SO_ACCEPTCONN:
836 v.val = sk->sk_state == TCP_LISTEN;
837 break;
1da177e4 838
e71a4783
SH		 839 case SO_PASSSEC:
840 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
841 break;
877ce7c1 842
e71a4783
SH		 843 case SO_PEERSEC:
844 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 845
4a19ec58
LAT		 846 case SO_MARK:
847 v.val = sk->sk_mark;
848 break;
849
e71a4783
SH		 850 default:
851 return -ENOPROTOOPT;
1da177e4 852 }
e71a4783 853
1da177e4
LT		 854 if (len > lv)
855 len = lv;
856 if (copy_to_user(optval, &v, len))
857 return -EFAULT;
858lenout:
4ec93edb
YH		 859 if (put_user(len, optlen))
860 return -EFAULT;
861 return 0;
1da177e4
LT		 862}
863
a5b5bb9a
IM		 864/*
865 * Initialize an sk_lock.
866 *
867 * (We also register the sk_lock with the lock validator.)
868 */
b6f99a21 869static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 870{
ed07536e
PZ		 871 sock_lock_init_class_and_name(sk,
872 af_family_slock_key_strings[sk->sk_family],
873 af_family_slock_keys + sk->sk_family,
874 af_family_key_strings[sk->sk_family],
875 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 876}
877
f1a6c4da
PE		 878static void sock_copy(struct sock *nsk, const struct sock *osk)
879{
880#ifdef CONFIG_SECURITY_NETWORK
881 void *sptr = nsk->sk_security;
882#endif
883
884 memcpy(nsk, osk, osk->sk_prot->obj_size);
f1a6c4da
PE		 885#ifdef CONFIG_SECURITY_NETWORK
886 nsk->sk_security = sptr;
887 security_sk_clone(osk, nsk);
888#endif
889}
890
2e4afe7b
PE		 891static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
892 int family)
c308c1b2
PE		 893{
894 struct sock *sk;
895 struct kmem_cache *slab;
896
897 slab = prot->slab;
898 if (slab != NULL)
899 sk = kmem_cache_alloc(slab, priority);
900 else
901 sk = kmalloc(prot->obj_size, priority);
902
2e4afe7b
PE		 903 if (sk != NULL) {
904 if (security_sk_alloc(sk, family, priority))
905 goto out_free;
906
907 if (!try_module_get(prot->owner))
908 goto out_free_sec;
909 }
910
c308c1b2 911 return sk;
2e4afe7b
PE		 912
913out_free_sec:
914 security_sk_free(sk);
915out_free:
916 if (slab != NULL)
917 kmem_cache_free(slab, sk);
918 else
919 kfree(sk);
920 return NULL;
c308c1b2
PE		 921}
922
923static void sk_prot_free(struct proto *prot, struct sock *sk)
924{
925 struct kmem_cache *slab;
2e4afe7b 926 struct module *owner;
c308c1b2 927
2e4afe7b 928 owner = prot->owner;
c308c1b2 929 slab = prot->slab;
2e4afe7b
PE		 930
931 security_sk_free(sk);
c308c1b2
PE		 932 if (slab != NULL)
933 kmem_cache_free(slab, sk);
934 else
935 kfree(sk);
2e4afe7b 936 module_put(owner);
c308c1b2
PE		 937}
938
1da177e4
LT		 939/**
940 * sk_alloc - All socket objects are allocated here
c4ea43c5 941 * @net: the applicable net namespace
4dc3b16b
PP		 942 * @family: protocol family
943 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
944 * @prot: struct proto associated with this new sock instance
945 * @zero_it: if we should zero the newly allocated sock
1da177e4 946 */
1b8d7ae4 947struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 948 struct proto *prot)
1da177e4 949{
c308c1b2 950 struct sock *sk;
1da177e4 951
154adbc8 952 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 953 if (sk) {
154adbc8
PE		 954 sk->sk_family = family;
955 /*
956 * See comment in struct sock definition to understand
957 * why we need sk_prot_creator -acme
958 */
959 sk->sk_prot = sk->sk_prot_creator = prot;
960 sock_lock_init(sk);
961 sk->sk_net = get_net(net);
1da177e4 962 }
a79af59e 963
2e4afe7b 964 return sk;
1da177e4
LT		 965}
966
967void sk_free(struct sock *sk)
968{
969 struct sk_filter *filter;
1da177e4
LT		 970
971 if (sk->sk_destruct)
972 sk->sk_destruct(sk);
973
fda9ef5d 974 filter = rcu_dereference(sk->sk_filter);
1da177e4 975 if (filter) {
309dd5fc 976 sk_filter_uncharge(sk, filter);
fda9ef5d 977 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 978 }
979
980 sock_disable_timestamp(sk);
981
982 if (atomic_read(&sk->sk_omem_alloc))
983 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
984 __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
985
1b8d7ae4 986 put_net(sk->sk_net);
c308c1b2 987 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4
LT		 988}
989
edf02087
DL		 990/*
991 * Last sock_put should drop referrence to sk->sk_net. It has already
992 * been dropped in sk_change_net. Taking referrence to stopping namespace
993 * is not an option.
994 * Take referrence to a socket to remove it from hash _alive_ and after that
995 * destroy it in the context of init_net.
996 */
997void sk_release_kernel(struct sock *sk)
998{
999 if (sk == NULL || sk->sk_socket == NULL)
1000 return;
1001
1002 sock_hold(sk);
1003 sock_release(sk->sk_socket);
1004 sk->sk_net = get_net(&init_net);
1005 sock_put(sk);
1006}
1007
dd0fc66f 1008struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1009{
8fd1d178 1010 struct sock *newsk;
87d11ceb 1011
8fd1d178 1012 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1013 if (newsk != NULL) {
1014 struct sk_filter *filter;
1015
892c141e 1016 sock_copy(newsk, sk);
87d11ceb
ACM		 1017
1018 /* SANITY */
1e2e6b89 1019 get_net(newsk->sk_net);
87d11ceb
ACM		 1020 sk_node_init(&newsk->sk_node);
1021 sock_lock_init(newsk);
1022 bh_lock_sock(newsk);
fa438ccf 1023 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
87d11ceb
ACM		 1024
1025 atomic_set(&newsk->sk_rmem_alloc, 0);
1026 atomic_set(&newsk->sk_wmem_alloc, 0);
1027 atomic_set(&newsk->sk_omem_alloc, 0);
1028 skb_queue_head_init(&newsk->sk_receive_queue);
1029 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1030#ifdef CONFIG_NET_DMA
1031 skb_queue_head_init(&newsk->sk_async_wait_queue);
1032#endif
87d11ceb
ACM		 1033
1034 rwlock_init(&newsk->sk_dst_lock);
1035 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1036 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1037 af_callback_keys + newsk->sk_family,
1038 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1039
1040 newsk->sk_dst_cache = NULL;
1041 newsk->sk_wmem_queued = 0;
1042 newsk->sk_forward_alloc = 0;
1043 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1044 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1045
1046 sock_reset_flag(newsk, SOCK_DONE);
1047 skb_queue_head_init(&newsk->sk_error_queue);
1048
1049 filter = newsk->sk_filter;
1050 if (filter != NULL)
1051 sk_filter_charge(newsk, filter);
1052
1053 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1054 /* It is still raw copy of parent, so invalidate
1055 * destructor and make plain sk_free() */
1056 newsk->sk_destruct = NULL;
1057 sk_free(newsk);
1058 newsk = NULL;
1059 goto out;
1060 }
1061
1062 newsk->sk_err = 0;
1063 newsk->sk_priority = 0;
1064 atomic_set(&newsk->sk_refcnt, 2);
1065
1066 /*
1067 * Increment the counter in the same struct proto as the master
1068 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1069 * is the same as sk->sk_prot->socks, as this field was copied
1070 * with memcpy).
1071 *
1072 * This _changes_ the previous behaviour, where
1073 * tcp_create_openreq_child always was incrementing the
1074 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1075 * to be taken into account in all callers. -acme
1076 */
1077 sk_refcnt_debug_inc(newsk);
1078 newsk->sk_socket = NULL;
1079 newsk->sk_sleep = NULL;
1080
1081 if (newsk->sk_prot->sockets_allocated)
1082 atomic_inc(newsk->sk_prot->sockets_allocated);
1083 }
1084out:
1085 return newsk;
1086}
1087
1088EXPORT_SYMBOL_GPL(sk_clone);
1089
9958089a
AK		 1090void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1091{
1092 __sk_dst_set(sk, dst);
1093 sk->sk_route_caps = dst->dev->features;
1094 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1095 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
9958089a
AK		 1096 if (sk_can_gso(sk)) {
1097 if (dst->header_len)
1098 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1099 else
1100 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1101 }
1102}
1103EXPORT_SYMBOL_GPL(sk_setup_caps);
1104
1da177e4
LT		 1105void __init sk_init(void)
1106{
1107 if (num_physpages <= 4096) {
1108 sysctl_wmem_max = 32767;
1109 sysctl_rmem_max = 32767;
1110 sysctl_wmem_default = 32767;
1111 sysctl_rmem_default = 32767;
1112 } else if (num_physpages >= 131072) {
1113 sysctl_wmem_max = 131071;
1114 sysctl_rmem_max = 131071;
1115 }
1116}
1117
1118/*
1119 * Simple resource managers for sockets.
1120 */
1121
1122
4ec93edb
YH		 1123/*
1124 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1125 */
1126void sock_wfree(struct sk_buff *skb)
1127{
1128 struct sock *sk = skb->sk;
1129
1130 /* In case it might be waiting for more memory. */
1131 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1132 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1133 sk->sk_write_space(sk);
1134 sock_put(sk);
1135}
1136
4ec93edb
YH		 1137/*
1138 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1139 */
1140void sock_rfree(struct sk_buff *skb)
1141{
1142 struct sock *sk = skb->sk;
1143
3ab224be 1144 skb_truesize_check(skb);
1da177e4 1145 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1146 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4
LT		 1147}
1148
1149
1150int sock_i_uid(struct sock *sk)
1151{
1152 int uid;
1153
1154 read_lock(&sk->sk_callback_lock);
1155 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1156 read_unlock(&sk->sk_callback_lock);
1157 return uid;
1158}
1159
1160unsigned long sock_i_ino(struct sock *sk)
1161{
1162 unsigned long ino;
1163
1164 read_lock(&sk->sk_callback_lock);
1165 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1166 read_unlock(&sk->sk_callback_lock);
1167 return ino;
1168}
1169
1170/*
1171 * Allocate a skb from the socket's send buffer.
1172 */
86a76caf 1173struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1174 gfp_t priority)
1da177e4
LT		 1175{
1176 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1177 struct sk_buff * skb = alloc_skb(size, priority);
1178 if (skb) {
1179 skb_set_owner_w(skb, sk);
1180 return skb;
1181 }
1182 }
1183 return NULL;
1184}
1185
1186/*
1187 * Allocate a skb from the socket's receive buffer.
4ec93edb 1188 */
86a76caf 1189struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1190 gfp_t priority)
1da177e4
LT		 1191{
1192 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1193 struct sk_buff *skb = alloc_skb(size, priority);
1194 if (skb) {
1195 skb_set_owner_r(skb, sk);
1196 return skb;
1197 }
1198 }
1199 return NULL;
1200}
1201
4ec93edb 1202/*
1da177e4 1203 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1204 */
dd0fc66f 1205void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1206{
1207 if ((unsigned)size <= sysctl_optmem_max &&
1208 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1209 void *mem;
1210 /* First do the add, to avoid the race if kmalloc
4ec93edb 1211 * might sleep.
1da177e4
LT		 1212 */
1213 atomic_add(size, &sk->sk_omem_alloc);
1214 mem = kmalloc(size, priority);
1215 if (mem)
1216 return mem;
1217 atomic_sub(size, &sk->sk_omem_alloc);
1218 }
1219 return NULL;
1220}
1221
1222/*
1223 * Free an option memory block.
1224 */
1225void sock_kfree_s(struct sock *sk, void *mem, int size)
1226{
1227 kfree(mem);
1228 atomic_sub(size, &sk->sk_omem_alloc);
1229}
1230
1231/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1232 I think, these locks should be removed for datagram sockets.
1233 */
1234static long sock_wait_for_wmem(struct sock * sk, long timeo)
1235{
1236 DEFINE_WAIT(wait);
1237
1238 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1239 for (;;) {
1240 if (!timeo)
1241 break;
1242 if (signal_pending(current))
1243 break;
1244 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1245 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1246 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1247 break;
1248 if (sk->sk_shutdown & SEND_SHUTDOWN)
1249 break;
1250 if (sk->sk_err)
1251 break;
1252 timeo = schedule_timeout(timeo);
1253 }
1254 finish_wait(sk->sk_sleep, &wait);
1255 return timeo;
1256}
1257
1258
1259/*
1260 * Generic send/receive buffer handlers
1261 */
1262
1263static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1264 unsigned long header_len,
1265 unsigned long data_len,
1266 int noblock, int *errcode)
1267{
1268 struct sk_buff *skb;
7d877f3b 1269 gfp_t gfp_mask;
1da177e4
LT		 1270 long timeo;
1271 int err;
1272
1273 gfp_mask = sk->sk_allocation;
1274 if (gfp_mask & __GFP_WAIT)
1275 gfp_mask |= __GFP_REPEAT;
1276
1277 timeo = sock_sndtimeo(sk, noblock);
1278 while (1) {
1279 err = sock_error(sk);
1280 if (err != 0)
1281 goto failure;
1282
1283 err = -EPIPE;
1284 if (sk->sk_shutdown & SEND_SHUTDOWN)
1285 goto failure;
1286
1287 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1288 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1289 if (skb) {
1290 int npages;
1291 int i;
1292
1293 /* No pages, we're done... */
1294 if (!data_len)
1295 break;
1296
1297 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1298 skb->truesize += data_len;
1299 skb_shinfo(skb)->nr_frags = npages;
1300 for (i = 0; i < npages; i++) {
1301 struct page *page;
1302 skb_frag_t *frag;
1303
1304 page = alloc_pages(sk->sk_allocation, 0);
1305 if (!page) {
1306 err = -ENOBUFS;
1307 skb_shinfo(skb)->nr_frags = i;
1308 kfree_skb(skb);
1309 goto failure;
1310 }
1311
1312 frag = &skb_shinfo(skb)->frags[i];
1313 frag->page = page;
1314 frag->page_offset = 0;
1315 frag->size = (data_len >= PAGE_SIZE ?
1316 PAGE_SIZE :
1317 data_len);
1318 data_len -= PAGE_SIZE;
1319 }
1320
1321 /* Full success... */
1322 break;
1323 }
1324 err = -ENOBUFS;
1325 goto failure;
1326 }
1327 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1328 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1329 err = -EAGAIN;
1330 if (!timeo)
1331 goto failure;
1332 if (signal_pending(current))
1333 goto interrupted;
1334 timeo = sock_wait_for_wmem(sk, timeo);
1335 }
1336
1337 skb_set_owner_w(skb, sk);
1338 return skb;
1339
1340interrupted:
1341 err = sock_intr_errno(timeo);
1342failure:
1343 *errcode = err;
1344 return NULL;
1345}
1346
4ec93edb 1347struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1348 int noblock, int *errcode)
1349{
1350 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1351}
1352
1353static void __lock_sock(struct sock *sk)
1354{
1355 DEFINE_WAIT(wait);
1356
e71a4783 1357 for (;;) {
1da177e4
LT		 1358 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1359 TASK_UNINTERRUPTIBLE);
1360 spin_unlock_bh(&sk->sk_lock.slock);
1361 schedule();
1362 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1363 if (!sock_owned_by_user(sk))
1da177e4
LT		 1364 break;
1365 }
1366 finish_wait(&sk->sk_lock.wq, &wait);
1367}
1368
1369static void __release_sock(struct sock *sk)
1370{
1371 struct sk_buff *skb = sk->sk_backlog.head;
1372
1373 do {
1374 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1375 bh_unlock_sock(sk);
1376
1377 do {
1378 struct sk_buff *next = skb->next;
1379
1380 skb->next = NULL;
1381 sk->sk_backlog_rcv(sk, skb);
1382
1383 /*
1384 * We are in process context here with softirqs
1385 * disabled, use cond_resched_softirq() to preempt.
1386 * This is safe to do because we've taken the backlog
1387 * queue private:
1388 */
1389 cond_resched_softirq();
1390
1391 skb = next;
1392 } while (skb != NULL);
1393
1394 bh_lock_sock(sk);
e71a4783 1395 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1396}
1397
1398/**
1399 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1400 * @sk: sock to wait on
1401 * @timeo: for how long
1da177e4
LT		 1402 *
1403 * Now socket state including sk->sk_err is changed only under lock,
1404 * hence we may omit checks after joining wait queue.
1405 * We check receive queue before schedule() only as optimization;
1406 * it is very likely that release_sock() added new data.
1407 */
1408int sk_wait_data(struct sock *sk, long *timeo)
1409{
1410 int rc;
1411 DEFINE_WAIT(wait);
1412
1413 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1414 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1415 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1416 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1417 finish_wait(sk->sk_sleep, &wait);
1418 return rc;
1419}
1420
1421EXPORT_SYMBOL(sk_wait_data);
1422
3ab224be
HA		 1423/**
1424 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1425 * @sk: socket
1426 * @size: memory size to allocate
1427 * @kind: allocation type
1428 *
1429 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1430 * rmem allocation. This function assumes that protocols which have
1431 * memory_pressure use sk_wmem_queued as write buffer accounting.
1432 */
1433int __sk_mem_schedule(struct sock *sk, int size, int kind)
1434{
1435 struct proto *prot = sk->sk_prot;
1436 int amt = sk_mem_pages(size);
1437 int allocated;
1438
1439 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1440 allocated = atomic_add_return(amt, prot->memory_allocated);
1441
1442 /* Under limit. */
1443 if (allocated <= prot->sysctl_mem[0]) {
1444 if (prot->memory_pressure && *prot->memory_pressure)
1445 *prot->memory_pressure = 0;
1446 return 1;
1447 }
1448
1449 /* Under pressure. */
1450 if (allocated > prot->sysctl_mem[1])
1451 if (prot->enter_memory_pressure)
1452 prot->enter_memory_pressure();
1453
1454 /* Over hard limit. */
1455 if (allocated > prot->sysctl_mem[2])
1456 goto suppress_allocation;
1457
1458 /* guarantee minimum buffer size under pressure */
1459 if (kind == SK_MEM_RECV) {
1460 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1461 return 1;
1462 } else { /* SK_MEM_SEND */
1463 if (sk->sk_type == SOCK_STREAM) {
1464 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1465 return 1;
1466 } else if (atomic_read(&sk->sk_wmem_alloc) <
1467 prot->sysctl_wmem[0])
1468 return 1;
1469 }
1470
1471 if (prot->memory_pressure) {
1472 if (!*prot->memory_pressure ||
1473 prot->sysctl_mem[2] > atomic_read(prot->sockets_allocated) *
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))
1642 wake_up_interruptible(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
LT		 1655 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1656 wake_up_interruptible(sk->sk_sleep);
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;
1712 sk->sk_socket = sock;
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
b7aa0bf7 1746 sk->sk_stamp = ktime_set(-1L, -1L);
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
b733c007
PE		 1940int proto_register(struct proto *prot, int alloc_slab)
1941{
1942 char *request_sock_slab_name = NULL;
1943 char *timewait_sock_slab_name;
1944
65f76517 1945 if (sock_prot_inuse_init(prot) != 0) {
ebb53d75 1946 printk(KERN_CRIT "%s: Can't alloc inuse counters!\n", prot->name);
b733c007 1947 goto out;
ebb53d75 1948 }
b733c007 1949
1da177e4
LT		 1950 if (alloc_slab) {
1951 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
20c2df83 1952 SLAB_HWCACHE_ALIGN, NULL);
1da177e4
LT		 1953
1954 if (prot->slab == NULL) {
1955 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
1956 prot->name);
286ab3d4 1957 goto out_free_inuse;
1da177e4 1958 }
2e6599cb
ACM		 1959
1960 if (prot->rsk_prot != NULL) {
1961 static const char mask[] = "request_sock_%s";
1962
1963 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1964 if (request_sock_slab_name == NULL)
1965 goto out_free_sock_slab;
1966
1967 sprintf(request_sock_slab_name, mask, prot->name);
1968 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
1969 prot->rsk_prot->obj_size, 0,
20c2df83 1970 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 1971
1972 if (prot->rsk_prot->slab == NULL) {
1973 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
1974 prot->name);
1975 goto out_free_request_sock_slab_name;
1976 }
1977 }
8feaf0c0 1978
6d6ee43e 1979 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 1980 static const char mask[] = "tw_sock_%s";
1981
1982 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1983
1984 if (timewait_sock_slab_name == NULL)
1985 goto out_free_request_sock_slab;
1986
1987 sprintf(timewait_sock_slab_name, mask, prot->name);
6d6ee43e
ACM		 1988 prot->twsk_prot->twsk_slab =
1989 kmem_cache_create(timewait_sock_slab_name,
1990 prot->twsk_prot->twsk_obj_size,
1991 0, SLAB_HWCACHE_ALIGN,
20c2df83 1992 NULL);
6d6ee43e 1993 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 1994 goto out_free_timewait_sock_slab_name;
1995 }
1da177e4
LT		 1996 }
1997
2a278051 1998 write_lock(&proto_list_lock);
1da177e4 1999 list_add(&prot->node, &proto_list);
1da177e4 2000 write_unlock(&proto_list_lock);
b733c007
PE		 2001 return 0;
2002
8feaf0c0
ACM		 2003out_free_timewait_sock_slab_name:
2004 kfree(timewait_sock_slab_name);
2005out_free_request_sock_slab:
2006 if (prot->rsk_prot && prot->rsk_prot->slab) {
2007 kmem_cache_destroy(prot->rsk_prot->slab);
2008 prot->rsk_prot->slab = NULL;
2009 }
2e6599cb
ACM		 2010out_free_request_sock_slab_name:
2011 kfree(request_sock_slab_name);
2012out_free_sock_slab:
2013 kmem_cache_destroy(prot->slab);
2014 prot->slab = NULL;
286ab3d4 2015out_free_inuse:
65f76517 2016 sock_prot_inuse_free(prot);
b733c007
PE		 2017out:
2018 return -ENOBUFS;
1da177e4
LT		 2019}
2020
2021EXPORT_SYMBOL(proto_register);
2022
2023void proto_unregister(struct proto *prot)
2024{
2025 write_lock(&proto_list_lock);
0a3f4358
PM		 2026 list_del(&prot->node);
2027 write_unlock(&proto_list_lock);
1da177e4 2028
65f76517 2029 sock_prot_inuse_free(prot);
ebb53d75 2030
1da177e4
LT		 2031 if (prot->slab != NULL) {
2032 kmem_cache_destroy(prot->slab);
2033 prot->slab = NULL;
2034 }
2035
2e6599cb
ACM		 2036 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2037 const char *name = kmem_cache_name(prot->rsk_prot->slab);
2038
2039 kmem_cache_destroy(prot->rsk_prot->slab);
2040 kfree(name);
2041 prot->rsk_prot->slab = NULL;
2042 }
2043
6d6ee43e
ACM		 2044 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2045 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
8feaf0c0 2046
6d6ee43e 2047 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
8feaf0c0 2048 kfree(name);
6d6ee43e 2049 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2050 }
1da177e4
LT		 2051}
2052
2053EXPORT_SYMBOL(proto_unregister);
2054
2055#ifdef CONFIG_PROC_FS
1da177e4 2056static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2057 __acquires(proto_list_lock)
1da177e4
LT		 2058{
2059 read_lock(&proto_list_lock);
60f0438a 2060 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2061}
2062
2063static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2064{
60f0438a 2065 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2066}
2067
2068static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2069 __releases(proto_list_lock)
1da177e4
LT		 2070{
2071 read_unlock(&proto_list_lock);
2072}
2073
2074static char proto_method_implemented(const void *method)
2075{
2076 return method == NULL ? 'n' : 'y';
2077}
2078
2079static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2080{
2081 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2082 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2083 proto->name,
2084 proto->obj_size,
2085 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
2086 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2087 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2088 proto->max_header,
2089 proto->slab == NULL ? "no" : "yes",
2090 module_name(proto->owner),
2091 proto_method_implemented(proto->close),
2092 proto_method_implemented(proto->connect),
2093 proto_method_implemented(proto->disconnect),
2094 proto_method_implemented(proto->accept),
2095 proto_method_implemented(proto->ioctl),
2096 proto_method_implemented(proto->init),
2097 proto_method_implemented(proto->destroy),
2098 proto_method_implemented(proto->shutdown),
2099 proto_method_implemented(proto->setsockopt),
2100 proto_method_implemented(proto->getsockopt),
2101 proto_method_implemented(proto->sendmsg),
2102 proto_method_implemented(proto->recvmsg),
2103 proto_method_implemented(proto->sendpage),
2104 proto_method_implemented(proto->bind),
2105 proto_method_implemented(proto->backlog_rcv),
2106 proto_method_implemented(proto->hash),
2107 proto_method_implemented(proto->unhash),
2108 proto_method_implemented(proto->get_port),
2109 proto_method_implemented(proto->enter_memory_pressure));
2110}
2111
2112static int proto_seq_show(struct seq_file *seq, void *v)
2113{
60f0438a 2114 if (v == &proto_list)
1da177e4
LT		 2115 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2116 "protocol",
2117 "size",
2118 "sockets",
2119 "memory",
2120 "press",
2121 "maxhdr",
2122 "slab",
2123 "module",
2124 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2125 else
60f0438a 2126 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2127 return 0;
2128}
2129
f690808e 2130static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2131 .start = proto_seq_start,
2132 .next = proto_seq_next,
2133 .stop = proto_seq_stop,
2134 .show = proto_seq_show,
2135};
2136
2137static int proto_seq_open(struct inode *inode, struct file *file)
2138{
2139 return seq_open(file, &proto_seq_ops);
2140}
2141
9a32144e 2142static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2143 .owner = THIS_MODULE,
2144 .open = proto_seq_open,
2145 .read = seq_read,
2146 .llseek = seq_lseek,
2147 .release = seq_release,
2148};
2149
2150static int __init proto_init(void)
2151{
2152 /* register /proc/net/protocols */
457c4cbc 2153 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
1da177e4
LT		 2154}
2155
2156subsys_initcall(proto_init);
2157
2158#endif /* PROC_FS */
2159
2160EXPORT_SYMBOL(sk_alloc);
2161EXPORT_SYMBOL(sk_free);
2162EXPORT_SYMBOL(sk_send_sigurg);
2163EXPORT_SYMBOL(sock_alloc_send_skb);
2164EXPORT_SYMBOL(sock_init_data);
2165EXPORT_SYMBOL(sock_kfree_s);
2166EXPORT_SYMBOL(sock_kmalloc);
2167EXPORT_SYMBOL(sock_no_accept);
2168EXPORT_SYMBOL(sock_no_bind);
2169EXPORT_SYMBOL(sock_no_connect);
2170EXPORT_SYMBOL(sock_no_getname);
2171EXPORT_SYMBOL(sock_no_getsockopt);
2172EXPORT_SYMBOL(sock_no_ioctl);
2173EXPORT_SYMBOL(sock_no_listen);
2174EXPORT_SYMBOL(sock_no_mmap);
2175EXPORT_SYMBOL(sock_no_poll);
2176EXPORT_SYMBOL(sock_no_recvmsg);
2177EXPORT_SYMBOL(sock_no_sendmsg);
2178EXPORT_SYMBOL(sock_no_sendpage);
2179EXPORT_SYMBOL(sock_no_setsockopt);
2180EXPORT_SYMBOL(sock_no_shutdown);
2181EXPORT_SYMBOL(sock_no_socketpair);
2182EXPORT_SYMBOL(sock_rfree);
2183EXPORT_SYMBOL(sock_setsockopt);
2184EXPORT_SYMBOL(sock_wfree);
2185EXPORT_SYMBOL(sock_wmalloc);
2186EXPORT_SYMBOL(sock_i_uid);
2187EXPORT_SYMBOL(sock_i_ino);
1da177e4 2188EXPORT_SYMBOL(sysctl_optmem_max);