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RDS: Add userspace header
[deliverable/linux.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
4fc268d2 92#include <linux/capability.h>
1da177e4
LT		 93#include <linux/errno.h>
94#include <linux/types.h>
95#include <linux/socket.h>
96#include <linux/in.h>
97#include <linux/kernel.h>
1da177e4
LT		 98#include <linux/module.h>
99#include <linux/proc_fs.h>
100#include <linux/seq_file.h>
101#include <linux/sched.h>
102#include <linux/timer.h>
103#include <linux/string.h>
104#include <linux/sockios.h>
105#include <linux/net.h>
106#include <linux/mm.h>
107#include <linux/slab.h>
108#include <linux/interrupt.h>
109#include <linux/poll.h>
110#include <linux/tcp.h>
111#include <linux/init.h>
a1f8e7f7 112#include <linux/highmem.h>
1da177e4
LT		 113
114#include <asm/uaccess.h>
115#include <asm/system.h>
116
117#include <linux/netdevice.h>
118#include <net/protocol.h>
119#include <linux/skbuff.h>
457c4cbc 120#include <net/net_namespace.h>
2e6599cb 121#include <net/request_sock.h>
1da177e4 122#include <net/sock.h>
20d49473 123#include <linux/net_tstamp.h>
1da177e4
LT		 124#include <net/xfrm.h>
125#include <linux/ipsec.h>
126
127#include <linux/filter.h>
128
129#ifdef CONFIG_INET
130#include <net/tcp.h>
131#endif
132
da21f24d
IM		 133/*
134 * Each address family might have different locking rules, so we have
135 * one slock key per address family:
136 */
a5b5bb9a
IM		 137static struct lock_class_key af_family_keys[AF_MAX];
138static struct lock_class_key af_family_slock_keys[AF_MAX];
139
a5b5bb9a
IM		 140/*
141 * Make lock validator output more readable. (we pre-construct these
142 * strings build-time, so that runtime initialization of socket
143 * locks is fast):
144 */
145static const char *af_family_key_strings[AF_MAX+1] = {
146 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
147 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
148 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
149 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
150 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
151 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
152 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
153 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
154 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 155 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 156 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154
RDC		 157 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
158 "sk_lock-AF_MAX"
a5b5bb9a
IM		 159};
160static const char *af_family_slock_key_strings[AF_MAX+1] = {
161 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
162 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
163 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
164 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
165 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
166 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
167 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
168 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" ,
169 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 170 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 171 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154
RDC		 172 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
173 "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" ,
b4942af6 185 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 186 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154
RDC		 187 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
188 "clock-AF_MAX"
443aef0e 189};
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 230 *timeo_p = 0;
50aab54f 231 if (warned < 10 && net_ratelimit()) {
ba78073e
VA		 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));
50aab54f 236 }
ba78073e
VA		 237 return 0;
238 }
1da177e4
LT		 239 *timeo_p = MAX_SCHEDULE_TIMEOUT;
240 if (tv.tv_sec == 0 && tv.tv_usec == 0)
241 return 0;
242 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
243 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
244 return 0;
245}
246
247static void sock_warn_obsolete_bsdism(const char *name)
248{
249 static int warned;
250 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 251 if (strcmp(warncomm, current->comm) && warned < 5) {
252 strcpy(warncomm, current->comm);
1da177e4
LT		 253 printk(KERN_WARNING "process `%s' is using obsolete "
254 "%s SO_BSDCOMPAT\n", warncomm, name);
255 warned++;
256 }
257}
258
20d49473 259static void sock_disable_timestamp(struct sock *sk, int flag)
4ec93edb 260{
20d49473
PO		 261 if (sock_flag(sk, flag)) {
262 sock_reset_flag(sk, flag);
263 if (!sock_flag(sk, SOCK_TIMESTAMP) &&
264 !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) {
265 net_disable_timestamp();
266 }
1da177e4
LT		 267 }
268}
269
270
f0088a50
DV		 271int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
272{
273 int err = 0;
274 int skb_len;
275
9ee6b7f1 276 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
f0088a50
DV		 277 number of warnings when compiling with -W --ANK
278 */
279 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
280 (unsigned)sk->sk_rcvbuf) {
281 err = -ENOMEM;
282 goto out;
283 }
284
fda9ef5d 285 err = sk_filter(sk, skb);
f0088a50
DV		 286 if (err)
287 goto out;
288
3ab224be
HA		 289 if (!sk_rmem_schedule(sk, skb->truesize)) {
290 err = -ENOBUFS;
291 goto out;
292 }
293
f0088a50
DV		 294 skb->dev = NULL;
295 skb_set_owner_r(skb, sk);
49ad9599 296
f0088a50
DV		 297 /* Cache the SKB length before we tack it onto the receive
298 * queue. Once it is added it no longer belongs to us and
299 * may be freed by other threads of control pulling packets
300 * from the queue.
301 */
302 skb_len = skb->len;
303
304 skb_queue_tail(&sk->sk_receive_queue, skb);
305
306 if (!sock_flag(sk, SOCK_DEAD))
307 sk->sk_data_ready(sk, skb_len);
308out:
309 return err;
310}
311EXPORT_SYMBOL(sock_queue_rcv_skb);
312
58a5a7b9 313int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 314{
315 int rc = NET_RX_SUCCESS;
316
fda9ef5d 317 if (sk_filter(sk, skb))
f0088a50
DV		 318 goto discard_and_relse;
319
320 skb->dev = NULL;
321
58a5a7b9
ACM		 322 if (nested)
323 bh_lock_sock_nested(sk);
324 else
325 bh_lock_sock(sk);
a5b5bb9a
IM		 326 if (!sock_owned_by_user(sk)) {
327 /*
328 * trylock + unlock semantics:
329 */
330 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
331
c57943a1 332 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 333
334 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
335 } else
f0088a50
DV		 336 sk_add_backlog(sk, skb);
337 bh_unlock_sock(sk);
338out:
339 sock_put(sk);
340 return rc;
341discard_and_relse:
342 kfree_skb(skb);
343 goto out;
344}
345EXPORT_SYMBOL(sk_receive_skb);
346
347struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
348{
349 struct dst_entry *dst = sk->sk_dst_cache;
350
351 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
352 sk->sk_dst_cache = NULL;
353 dst_release(dst);
354 return NULL;
355 }
356
357 return dst;
358}
359EXPORT_SYMBOL(__sk_dst_check);
360
361struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
362{
363 struct dst_entry *dst = sk_dst_get(sk);
364
365 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
366 sk_dst_reset(sk);
367 dst_release(dst);
368 return NULL;
369 }
370
371 return dst;
372}
373EXPORT_SYMBOL(sk_dst_check);
374
4878809f
DM		 375static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
376{
377 int ret = -ENOPROTOOPT;
378#ifdef CONFIG_NETDEVICES
3b1e0a65 379 struct net *net = sock_net(sk);
4878809f
DM		 380 char devname[IFNAMSIZ];
381 int index;
382
383 /* Sorry... */
384 ret = -EPERM;
385 if (!capable(CAP_NET_RAW))
386 goto out;
387
388 ret = -EINVAL;
389 if (optlen < 0)
390 goto out;
391
392 /* Bind this socket to a particular device like "eth0",
393 * as specified in the passed interface name. If the
394 * name is "" or the option length is zero the socket
395 * is not bound.
396 */
397 if (optlen > IFNAMSIZ - 1)
398 optlen = IFNAMSIZ - 1;
399 memset(devname, 0, sizeof(devname));
400
401 ret = -EFAULT;
402 if (copy_from_user(devname, optval, optlen))
403 goto out;
404
405 if (devname[0] == '\0') {
406 index = 0;
407 } else {
881d966b 408 struct net_device *dev = dev_get_by_name(net, devname);
4878809f
DM		 409
410 ret = -ENODEV;
411 if (!dev)
412 goto out;
413
414 index = dev->ifindex;
415 dev_put(dev);
416 }
417
418 lock_sock(sk);
419 sk->sk_bound_dev_if = index;
420 sk_dst_reset(sk);
421 release_sock(sk);
422
423 ret = 0;
424
425out:
426#endif
427
428 return ret;
429}
430
c0ef877b
PE		 431static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
432{
433 if (valbool)
434 sock_set_flag(sk, bit);
435 else
436 sock_reset_flag(sk, bit);
437}
438
1da177e4
LT		 439/*
440 * This is meant for all protocols to use and covers goings on
441 * at the socket level. Everything here is generic.
442 */
443
444int sock_setsockopt(struct socket *sock, int level, int optname,
445 char __user *optval, int optlen)
446{
447 struct sock *sk=sock->sk;
1da177e4
LT		 448 int val;
449 int valbool;
450 struct linger ling;
451 int ret = 0;
4ec93edb 452
1da177e4
LT		 453 /*
454 * Options without arguments
455 */
456
4878809f
DM		 457 if (optname == SO_BINDTODEVICE)
458 return sock_bindtodevice(sk, optval, optlen);
459
e71a4783
SH		 460 if (optlen < sizeof(int))
461 return -EINVAL;
4ec93edb 462
1da177e4
LT		 463 if (get_user(val, (int __user *)optval))
464 return -EFAULT;
4ec93edb
YH		 465
466 valbool = val?1:0;
1da177e4
LT		 467
468 lock_sock(sk);
469
e71a4783
SH		 470 switch(optname) {
471 case SO_DEBUG:
472 if (val && !capable(CAP_NET_ADMIN)) {
473 ret = -EACCES;
c0ef877b
PE		 474 } else
475 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 476 break;
477 case SO_REUSEADDR:
478 sk->sk_reuse = valbool;
479 break;
480 case SO_TYPE:
481 case SO_ERROR:
482 ret = -ENOPROTOOPT;
483 break;
484 case SO_DONTROUTE:
c0ef877b 485 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 486 break;
487 case SO_BROADCAST:
488 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
489 break;
490 case SO_SNDBUF:
491 /* Don't error on this BSD doesn't and if you think
492 about it this is right. Otherwise apps have to
493 play 'guess the biggest size' games. RCVBUF/SNDBUF
494 are treated in BSD as hints */
495
496 if (val > sysctl_wmem_max)
497 val = sysctl_wmem_max;
b0573dea 498set_sndbuf:
e71a4783
SH		 499 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
500 if ((val * 2) < SOCK_MIN_SNDBUF)
501 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
502 else
503 sk->sk_sndbuf = val * 2;
1da177e4 504
e71a4783
SH		 505 /*
506 * Wake up sending tasks if we
507 * upped the value.
508 */
509 sk->sk_write_space(sk);
510 break;
1da177e4 511
e71a4783
SH		 512 case SO_SNDBUFFORCE:
513 if (!capable(CAP_NET_ADMIN)) {
514 ret = -EPERM;
515 break;
516 }
517 goto set_sndbuf;
b0573dea 518
e71a4783
SH		 519 case SO_RCVBUF:
520 /* Don't error on this BSD doesn't and if you think
521 about it this is right. Otherwise apps have to
522 play 'guess the biggest size' games. RCVBUF/SNDBUF
523 are treated in BSD as hints */
4ec93edb 524
e71a4783
SH		 525 if (val > sysctl_rmem_max)
526 val = sysctl_rmem_max;
b0573dea 527set_rcvbuf:
e71a4783
SH		 528 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
529 /*
530 * We double it on the way in to account for
531 * "struct sk_buff" etc. overhead. Applications
532 * assume that the SO_RCVBUF setting they make will
533 * allow that much actual data to be received on that
534 * socket.
535 *
536 * Applications are unaware that "struct sk_buff" and
537 * other overheads allocate from the receive buffer
538 * during socket buffer allocation.
539 *
540 * And after considering the possible alternatives,
541 * returning the value we actually used in getsockopt
542 * is the most desirable behavior.
543 */
544 if ((val * 2) < SOCK_MIN_RCVBUF)
545 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
546 else
547 sk->sk_rcvbuf = val * 2;
548 break;
549
550 case SO_RCVBUFFORCE:
551 if (!capable(CAP_NET_ADMIN)) {
552 ret = -EPERM;
1da177e4 553 break;
e71a4783
SH		 554 }
555 goto set_rcvbuf;
1da177e4 556
e71a4783 557 case SO_KEEPALIVE:
1da177e4 558#ifdef CONFIG_INET
e71a4783
SH		 559 if (sk->sk_protocol == IPPROTO_TCP)
560 tcp_set_keepalive(sk, valbool);
1da177e4 561#endif
e71a4783
SH		 562 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
563 break;
564
565 case SO_OOBINLINE:
566 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
567 break;
568
569 case SO_NO_CHECK:
570 sk->sk_no_check = valbool;
571 break;
572
573 case SO_PRIORITY:
574 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
575 sk->sk_priority = val;
576 else
577 ret = -EPERM;
578 break;
579
580 case SO_LINGER:
581 if (optlen < sizeof(ling)) {
582 ret = -EINVAL; /* 1003.1g */
1da177e4 583 break;
e71a4783
SH		 584 }
585 if (copy_from_user(&ling,optval,sizeof(ling))) {
586 ret = -EFAULT;
1da177e4 587 break;
e71a4783
SH		 588 }
589 if (!ling.l_onoff)
590 sock_reset_flag(sk, SOCK_LINGER);
591 else {
1da177e4 592#if (BITS_PER_LONG == 32)
e71a4783
SH		 593 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
594 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 595 else
e71a4783
SH		 596#endif
597 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
598 sock_set_flag(sk, SOCK_LINGER);
599 }
600 break;
601
602 case SO_BSDCOMPAT:
603 sock_warn_obsolete_bsdism("setsockopt");
604 break;
605
606 case SO_PASSCRED:
607 if (valbool)
608 set_bit(SOCK_PASSCRED, &sock->flags);
609 else
610 clear_bit(SOCK_PASSCRED, &sock->flags);
611 break;
612
613 case SO_TIMESTAMP:
92f37fd2 614 case SO_TIMESTAMPNS:
e71a4783 615 if (valbool) {
92f37fd2
ED		 616 if (optname == SO_TIMESTAMP)
617 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
618 else
619 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 620 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 621 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 622 } else {
e71a4783 623 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 624 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
625 }
e71a4783
SH		 626 break;
627
20d49473
PO		 628 case SO_TIMESTAMPING:
629 if (val & ~SOF_TIMESTAMPING_MASK) {
630 ret = EINVAL;
631 break;
632 }
633 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
634 val & SOF_TIMESTAMPING_TX_HARDWARE);
635 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
636 val & SOF_TIMESTAMPING_TX_SOFTWARE);
637 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
638 val & SOF_TIMESTAMPING_RX_HARDWARE);
639 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
640 sock_enable_timestamp(sk,
641 SOCK_TIMESTAMPING_RX_SOFTWARE);
642 else
643 sock_disable_timestamp(sk,
644 SOCK_TIMESTAMPING_RX_SOFTWARE);
645 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
646 val & SOF_TIMESTAMPING_SOFTWARE);
647 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
648 val & SOF_TIMESTAMPING_SYS_HARDWARE);
649 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
650 val & SOF_TIMESTAMPING_RAW_HARDWARE);
651 break;
652
e71a4783
SH		 653 case SO_RCVLOWAT:
654 if (val < 0)
655 val = INT_MAX;
656 sk->sk_rcvlowat = val ? : 1;
657 break;
658
659 case SO_RCVTIMEO:
660 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
661 break;
662
663 case SO_SNDTIMEO:
664 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
665 break;
1da177e4 666
e71a4783
SH		 667 case SO_ATTACH_FILTER:
668 ret = -EINVAL;
669 if (optlen == sizeof(struct sock_fprog)) {
670 struct sock_fprog fprog;
1da177e4 671
e71a4783
SH		 672 ret = -EFAULT;
673 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 674 break;
e71a4783
SH		 675
676 ret = sk_attach_filter(&fprog, sk);
677 }
678 break;
679
680 case SO_DETACH_FILTER:
55b33325 681 ret = sk_detach_filter(sk);
e71a4783 682 break;
1da177e4 683
e71a4783
SH		 684 case SO_PASSSEC:
685 if (valbool)
686 set_bit(SOCK_PASSSEC, &sock->flags);
687 else
688 clear_bit(SOCK_PASSSEC, &sock->flags);
689 break;
4a19ec58
LAT		 690 case SO_MARK:
691 if (!capable(CAP_NET_ADMIN))
692 ret = -EPERM;
693 else {
694 sk->sk_mark = val;
695 }
696 break;
877ce7c1 697
1da177e4
LT		 698 /* We implement the SO_SNDLOWAT etc to
699 not be settable (1003.1g 5.3) */
e71a4783
SH		 700 default:
701 ret = -ENOPROTOOPT;
702 break;
4ec93edb 703 }
1da177e4
LT		 704 release_sock(sk);
705 return ret;
706}
707
708
709int sock_getsockopt(struct socket *sock, int level, int optname,
710 char __user *optval, int __user *optlen)
711{
712 struct sock *sk = sock->sk;
4ec93edb 713
e71a4783 714 union {
4ec93edb
YH		 715 int val;
716 struct linger ling;
1da177e4
LT		 717 struct timeval tm;
718 } v;
4ec93edb 719
1da177e4
LT		 720 unsigned int lv = sizeof(int);
721 int len;
4ec93edb 722
e71a4783 723 if (get_user(len, optlen))
4ec93edb 724 return -EFAULT;
e71a4783 725 if (len < 0)
1da177e4 726 return -EINVAL;
4ec93edb 727
50fee1de 728 memset(&v, 0, sizeof(v));
df0bca04 729
e71a4783
SH		 730 switch(optname) {
731 case SO_DEBUG:
732 v.val = sock_flag(sk, SOCK_DBG);
733 break;
734
735 case SO_DONTROUTE:
736 v.val = sock_flag(sk, SOCK_LOCALROUTE);
737 break;
738
739 case SO_BROADCAST:
740 v.val = !!sock_flag(sk, SOCK_BROADCAST);
741 break;
742
743 case SO_SNDBUF:
744 v.val = sk->sk_sndbuf;
745 break;
746
747 case SO_RCVBUF:
748 v.val = sk->sk_rcvbuf;
749 break;
750
751 case SO_REUSEADDR:
752 v.val = sk->sk_reuse;
753 break;
754
755 case SO_KEEPALIVE:
756 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
757 break;
758
759 case SO_TYPE:
760 v.val = sk->sk_type;
761 break;
762
763 case SO_ERROR:
764 v.val = -sock_error(sk);
765 if (v.val==0)
766 v.val = xchg(&sk->sk_err_soft, 0);
767 break;
768
769 case SO_OOBINLINE:
770 v.val = !!sock_flag(sk, SOCK_URGINLINE);
771 break;
772
773 case SO_NO_CHECK:
774 v.val = sk->sk_no_check;
775 break;
776
777 case SO_PRIORITY:
778 v.val = sk->sk_priority;
779 break;
780
781 case SO_LINGER:
782 lv = sizeof(v.ling);
783 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
784 v.ling.l_linger = sk->sk_lingertime / HZ;
785 break;
786
787 case SO_BSDCOMPAT:
788 sock_warn_obsolete_bsdism("getsockopt");
789 break;
790
791 case SO_TIMESTAMP:
92f37fd2
ED		 792 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
793 !sock_flag(sk, SOCK_RCVTSTAMPNS);
794 break;
795
796 case SO_TIMESTAMPNS:
797 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 798 break;
799
20d49473
PO		 800 case SO_TIMESTAMPING:
801 v.val = 0;
802 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
803 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
804 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
805 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
806 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
807 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
808 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
809 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
810 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
811 v.val |= SOF_TIMESTAMPING_SOFTWARE;
812 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
813 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
814 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
815 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
816 break;
817
e71a4783
SH		 818 case SO_RCVTIMEO:
819 lv=sizeof(struct timeval);
820 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
821 v.tm.tv_sec = 0;
822 v.tm.tv_usec = 0;
823 } else {
824 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
825 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
826 }
827 break;
828
829 case SO_SNDTIMEO:
830 lv=sizeof(struct timeval);
831 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
832 v.tm.tv_sec = 0;
833 v.tm.tv_usec = 0;
834 } else {
835 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
836 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
837 }
838 break;
1da177e4 839
e71a4783
SH		 840 case SO_RCVLOWAT:
841 v.val = sk->sk_rcvlowat;
842 break;
1da177e4 843
e71a4783
SH		 844 case SO_SNDLOWAT:
845 v.val=1;
846 break;
1da177e4 847
e71a4783
SH		 848 case SO_PASSCRED:
849 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
850 break;
1da177e4 851
e71a4783
SH		 852 case SO_PEERCRED:
853 if (len > sizeof(sk->sk_peercred))
854 len = sizeof(sk->sk_peercred);
855 if (copy_to_user(optval, &sk->sk_peercred, len))
856 return -EFAULT;
857 goto lenout;
1da177e4 858
e71a4783
SH		 859 case SO_PEERNAME:
860 {
861 char address[128];
862
863 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
864 return -ENOTCONN;
865 if (lv < len)
866 return -EINVAL;
867 if (copy_to_user(optval, address, len))
868 return -EFAULT;
869 goto lenout;
870 }
1da177e4 871
e71a4783
SH		 872 /* Dubious BSD thing... Probably nobody even uses it, but
873 * the UNIX standard wants it for whatever reason... -DaveM
874 */
875 case SO_ACCEPTCONN:
876 v.val = sk->sk_state == TCP_LISTEN;
877 break;
1da177e4 878
e71a4783
SH		 879 case SO_PASSSEC:
880 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
881 break;
877ce7c1 882
e71a4783
SH		 883 case SO_PEERSEC:
884 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 885
4a19ec58
LAT		 886 case SO_MARK:
887 v.val = sk->sk_mark;
888 break;
889
e71a4783
SH		 890 default:
891 return -ENOPROTOOPT;
1da177e4 892 }
e71a4783 893
1da177e4
LT		 894 if (len > lv)
895 len = lv;
896 if (copy_to_user(optval, &v, len))
897 return -EFAULT;
898lenout:
4ec93edb
YH		 899 if (put_user(len, optlen))
900 return -EFAULT;
901 return 0;
1da177e4
LT		 902}
903
a5b5bb9a
IM		 904/*
905 * Initialize an sk_lock.
906 *
907 * (We also register the sk_lock with the lock validator.)
908 */
b6f99a21 909static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 910{
ed07536e
PZ		 911 sock_lock_init_class_and_name(sk,
912 af_family_slock_key_strings[sk->sk_family],
913 af_family_slock_keys + sk->sk_family,
914 af_family_key_strings[sk->sk_family],
915 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 916}
917
f1a6c4da
PE		 918static void sock_copy(struct sock *nsk, const struct sock *osk)
919{
920#ifdef CONFIG_SECURITY_NETWORK
921 void *sptr = nsk->sk_security;
922#endif
923
924 memcpy(nsk, osk, osk->sk_prot->obj_size);
f1a6c4da
PE		 925#ifdef CONFIG_SECURITY_NETWORK
926 nsk->sk_security = sptr;
927 security_sk_clone(osk, nsk);
928#endif
929}
930
2e4afe7b
PE		 931static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
932 int family)
c308c1b2
PE		 933{
934 struct sock *sk;
935 struct kmem_cache *slab;
936
937 slab = prot->slab;
938 if (slab != NULL)
939 sk = kmem_cache_alloc(slab, priority);
940 else
941 sk = kmalloc(prot->obj_size, priority);
942
2e4afe7b
PE		 943 if (sk != NULL) {
944 if (security_sk_alloc(sk, family, priority))
945 goto out_free;
946
947 if (!try_module_get(prot->owner))
948 goto out_free_sec;
949 }
950
c308c1b2 951 return sk;
2e4afe7b
PE		 952
953out_free_sec:
954 security_sk_free(sk);
955out_free:
956 if (slab != NULL)
957 kmem_cache_free(slab, sk);
958 else
959 kfree(sk);
960 return NULL;
c308c1b2
PE		 961}
962
963static void sk_prot_free(struct proto *prot, struct sock *sk)
964{
965 struct kmem_cache *slab;
2e4afe7b 966 struct module *owner;
c308c1b2 967
2e4afe7b 968 owner = prot->owner;
c308c1b2 969 slab = prot->slab;
2e4afe7b
PE		 970
971 security_sk_free(sk);
c308c1b2
PE		 972 if (slab != NULL)
973 kmem_cache_free(slab, sk);
974 else
975 kfree(sk);
2e4afe7b 976 module_put(owner);
c308c1b2
PE		 977}
978
1da177e4
LT		 979/**
980 * sk_alloc - All socket objects are allocated here
c4ea43c5 981 * @net: the applicable net namespace
4dc3b16b
PP		 982 * @family: protocol family
983 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
984 * @prot: struct proto associated with this new sock instance
1da177e4 985 */
1b8d7ae4 986struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 987 struct proto *prot)
1da177e4 988{
c308c1b2 989 struct sock *sk;
1da177e4 990
154adbc8 991 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 992 if (sk) {
154adbc8
PE		 993 sk->sk_family = family;
994 /*
995 * See comment in struct sock definition to understand
996 * why we need sk_prot_creator -acme
997 */
998 sk->sk_prot = sk->sk_prot_creator = prot;
999 sock_lock_init(sk);
3b1e0a65 1000 sock_net_set(sk, get_net(net));
1da177e4 1001 }
a79af59e 1002
2e4afe7b 1003 return sk;
1da177e4
LT		 1004}
1005
1006void sk_free(struct sock *sk)
1007{
1008 struct sk_filter *filter;
1da177e4
LT		 1009
1010 if (sk->sk_destruct)
1011 sk->sk_destruct(sk);
1012
fda9ef5d 1013 filter = rcu_dereference(sk->sk_filter);
1da177e4 1014 if (filter) {
309dd5fc 1015 sk_filter_uncharge(sk, filter);
fda9ef5d 1016 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 1017 }
1018
20d49473
PO		 1019 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1020 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1da177e4
LT		 1021
1022 if (atomic_read(&sk->sk_omem_alloc))
1023 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 1024 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1025
3b1e0a65 1026 put_net(sock_net(sk));
c308c1b2 1027 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4
LT		 1028}
1029
edf02087
DL		 1030/*
1031 * Last sock_put should drop referrence to sk->sk_net. It has already
1032 * been dropped in sk_change_net. Taking referrence to stopping namespace
1033 * is not an option.
1034 * Take referrence to a socket to remove it from hash _alive_ and after that
1035 * destroy it in the context of init_net.
1036 */
1037void sk_release_kernel(struct sock *sk)
1038{
1039 if (sk == NULL || sk->sk_socket == NULL)
1040 return;
1041
1042 sock_hold(sk);
1043 sock_release(sk->sk_socket);
65a18ec5 1044 release_net(sock_net(sk));
3b1e0a65 1045 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1046 sock_put(sk);
1047}
45af1754 1048EXPORT_SYMBOL(sk_release_kernel);
edf02087 1049
dd0fc66f 1050struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1051{
8fd1d178 1052 struct sock *newsk;
87d11ceb 1053
8fd1d178 1054 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1055 if (newsk != NULL) {
1056 struct sk_filter *filter;
1057
892c141e 1058 sock_copy(newsk, sk);
87d11ceb
ACM		 1059
1060 /* SANITY */
3b1e0a65 1061 get_net(sock_net(newsk));
87d11ceb
ACM		 1062 sk_node_init(&newsk->sk_node);
1063 sock_lock_init(newsk);
1064 bh_lock_sock(newsk);
fa438ccf 1065 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
87d11ceb
ACM		 1066
1067 atomic_set(&newsk->sk_rmem_alloc, 0);
1068 atomic_set(&newsk->sk_wmem_alloc, 0);
1069 atomic_set(&newsk->sk_omem_alloc, 0);
1070 skb_queue_head_init(&newsk->sk_receive_queue);
1071 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1072#ifdef CONFIG_NET_DMA
1073 skb_queue_head_init(&newsk->sk_async_wait_queue);
1074#endif
87d11ceb
ACM		 1075
1076 rwlock_init(&newsk->sk_dst_lock);
1077 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1078 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1079 af_callback_keys + newsk->sk_family,
1080 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1081
1082 newsk->sk_dst_cache = NULL;
1083 newsk->sk_wmem_queued = 0;
1084 newsk->sk_forward_alloc = 0;
1085 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1086 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1087
1088 sock_reset_flag(newsk, SOCK_DONE);
1089 skb_queue_head_init(&newsk->sk_error_queue);
1090
1091 filter = newsk->sk_filter;
1092 if (filter != NULL)
1093 sk_filter_charge(newsk, filter);
1094
1095 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1096 /* It is still raw copy of parent, so invalidate
1097 * destructor and make plain sk_free() */
1098 newsk->sk_destruct = NULL;
1099 sk_free(newsk);
1100 newsk = NULL;
1101 goto out;
1102 }
1103
1104 newsk->sk_err = 0;
1105 newsk->sk_priority = 0;
1106 atomic_set(&newsk->sk_refcnt, 2);
1107
1108 /*
1109 * Increment the counter in the same struct proto as the master
1110 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1111 * is the same as sk->sk_prot->socks, as this field was copied
1112 * with memcpy).
1113 *
1114 * This _changes_ the previous behaviour, where
1115 * tcp_create_openreq_child always was incrementing the
1116 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1117 * to be taken into account in all callers. -acme
1118 */
1119 sk_refcnt_debug_inc(newsk);
972692e0 1120 sk_set_socket(newsk, NULL);
87d11ceb
ACM		 1121 newsk->sk_sleep = NULL;
1122
1123 if (newsk->sk_prot->sockets_allocated)
1748376b 1124 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
87d11ceb
ACM		 1125 }
1126out:
1127 return newsk;
1128}
1129
1130EXPORT_SYMBOL_GPL(sk_clone);
1131
9958089a
AK		 1132void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1133{
1134 __sk_dst_set(sk, dst);
1135 sk->sk_route_caps = dst->dev->features;
1136 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1137 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
9958089a 1138 if (sk_can_gso(sk)) {
82cc1a7a 1139 if (dst->header_len) {
9958089a 1140 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1141 } else {
9958089a 1142 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1143 sk->sk_gso_max_size = dst->dev->gso_max_size;
1144 }
9958089a
AK		 1145 }
1146}
1147EXPORT_SYMBOL_GPL(sk_setup_caps);
1148
1da177e4
LT		 1149void __init sk_init(void)
1150{
1151 if (num_physpages <= 4096) {
1152 sysctl_wmem_max = 32767;
1153 sysctl_rmem_max = 32767;
1154 sysctl_wmem_default = 32767;
1155 sysctl_rmem_default = 32767;
1156 } else if (num_physpages >= 131072) {
1157 sysctl_wmem_max = 131071;
1158 sysctl_rmem_max = 131071;
1159 }
1160}
1161
1162/*
1163 * Simple resource managers for sockets.
1164 */
1165
1166
4ec93edb
YH		 1167/*
1168 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1169 */
1170void sock_wfree(struct sk_buff *skb)
1171{
1172 struct sock *sk = skb->sk;
1173
1174 /* In case it might be waiting for more memory. */
1175 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1176 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1177 sk->sk_write_space(sk);
1178 sock_put(sk);
1179}
1180
4ec93edb
YH		 1181/*
1182 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1183 */
1184void sock_rfree(struct sk_buff *skb)
1185{
1186 struct sock *sk = skb->sk;
1187
1188 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1189 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4
LT		 1190}
1191
1192
1193int sock_i_uid(struct sock *sk)
1194{
1195 int uid;
1196
1197 read_lock(&sk->sk_callback_lock);
1198 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1199 read_unlock(&sk->sk_callback_lock);
1200 return uid;
1201}
1202
1203unsigned long sock_i_ino(struct sock *sk)
1204{
1205 unsigned long ino;
1206
1207 read_lock(&sk->sk_callback_lock);
1208 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1209 read_unlock(&sk->sk_callback_lock);
1210 return ino;
1211}
1212
1213/*
1214 * Allocate a skb from the socket's send buffer.
1215 */
86a76caf 1216struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1217 gfp_t priority)
1da177e4
LT		 1218{
1219 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1220 struct sk_buff * skb = alloc_skb(size, priority);
1221 if (skb) {
1222 skb_set_owner_w(skb, sk);
1223 return skb;
1224 }
1225 }
1226 return NULL;
1227}
1228
1229/*
1230 * Allocate a skb from the socket's receive buffer.
4ec93edb 1231 */
86a76caf 1232struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1233 gfp_t priority)
1da177e4
LT		 1234{
1235 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1236 struct sk_buff *skb = alloc_skb(size, priority);
1237 if (skb) {
1238 skb_set_owner_r(skb, sk);
1239 return skb;
1240 }
1241 }
1242 return NULL;
1243}
1244
4ec93edb 1245/*
1da177e4 1246 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1247 */
dd0fc66f 1248void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1249{
1250 if ((unsigned)size <= sysctl_optmem_max &&
1251 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1252 void *mem;
1253 /* First do the add, to avoid the race if kmalloc
4ec93edb 1254 * might sleep.
1da177e4
LT		 1255 */
1256 atomic_add(size, &sk->sk_omem_alloc);
1257 mem = kmalloc(size, priority);
1258 if (mem)
1259 return mem;
1260 atomic_sub(size, &sk->sk_omem_alloc);
1261 }
1262 return NULL;
1263}
1264
1265/*
1266 * Free an option memory block.
1267 */
1268void sock_kfree_s(struct sock *sk, void *mem, int size)
1269{
1270 kfree(mem);
1271 atomic_sub(size, &sk->sk_omem_alloc);
1272}
1273
1274/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1275 I think, these locks should be removed for datagram sockets.
1276 */
1277static long sock_wait_for_wmem(struct sock * sk, long timeo)
1278{
1279 DEFINE_WAIT(wait);
1280
1281 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1282 for (;;) {
1283 if (!timeo)
1284 break;
1285 if (signal_pending(current))
1286 break;
1287 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1288 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1289 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1290 break;
1291 if (sk->sk_shutdown & SEND_SHUTDOWN)
1292 break;
1293 if (sk->sk_err)
1294 break;
1295 timeo = schedule_timeout(timeo);
1296 }
1297 finish_wait(sk->sk_sleep, &wait);
1298 return timeo;
1299}
1300
1301
1302/*
1303 * Generic send/receive buffer handlers
1304 */
1305
4cc7f68d
HX		 1306struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1307 unsigned long data_len, int noblock,
1308 int *errcode)
1da177e4
LT		 1309{
1310 struct sk_buff *skb;
7d877f3b 1311 gfp_t gfp_mask;
1da177e4
LT		 1312 long timeo;
1313 int err;
1314
1315 gfp_mask = sk->sk_allocation;
1316 if (gfp_mask & __GFP_WAIT)
1317 gfp_mask |= __GFP_REPEAT;
1318
1319 timeo = sock_sndtimeo(sk, noblock);
1320 while (1) {
1321 err = sock_error(sk);
1322 if (err != 0)
1323 goto failure;
1324
1325 err = -EPIPE;
1326 if (sk->sk_shutdown & SEND_SHUTDOWN)
1327 goto failure;
1328
1329 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1330 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1331 if (skb) {
1332 int npages;
1333 int i;
1334
1335 /* No pages, we're done... */
1336 if (!data_len)
1337 break;
1338
1339 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1340 skb->truesize += data_len;
1341 skb_shinfo(skb)->nr_frags = npages;
1342 for (i = 0; i < npages; i++) {
1343 struct page *page;
1344 skb_frag_t *frag;
1345
1346 page = alloc_pages(sk->sk_allocation, 0);
1347 if (!page) {
1348 err = -ENOBUFS;
1349 skb_shinfo(skb)->nr_frags = i;
1350 kfree_skb(skb);
1351 goto failure;
1352 }
1353
1354 frag = &skb_shinfo(skb)->frags[i];
1355 frag->page = page;
1356 frag->page_offset = 0;
1357 frag->size = (data_len >= PAGE_SIZE ?
1358 PAGE_SIZE :
1359 data_len);
1360 data_len -= PAGE_SIZE;
1361 }
1362
1363 /* Full success... */
1364 break;
1365 }
1366 err = -ENOBUFS;
1367 goto failure;
1368 }
1369 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1370 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1371 err = -EAGAIN;
1372 if (!timeo)
1373 goto failure;
1374 if (signal_pending(current))
1375 goto interrupted;
1376 timeo = sock_wait_for_wmem(sk, timeo);
1377 }
1378
1379 skb_set_owner_w(skb, sk);
1380 return skb;
1381
1382interrupted:
1383 err = sock_intr_errno(timeo);
1384failure:
1385 *errcode = err;
1386 return NULL;
1387}
4cc7f68d 1388EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1389
4ec93edb 1390struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1391 int noblock, int *errcode)
1392{
1393 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1394}
1395
1396static void __lock_sock(struct sock *sk)
1397{
1398 DEFINE_WAIT(wait);
1399
e71a4783 1400 for (;;) {
1da177e4
LT		 1401 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1402 TASK_UNINTERRUPTIBLE);
1403 spin_unlock_bh(&sk->sk_lock.slock);
1404 schedule();
1405 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1406 if (!sock_owned_by_user(sk))
1da177e4
LT		 1407 break;
1408 }
1409 finish_wait(&sk->sk_lock.wq, &wait);
1410}
1411
1412static void __release_sock(struct sock *sk)
1413{
1414 struct sk_buff *skb = sk->sk_backlog.head;
1415
1416 do {
1417 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1418 bh_unlock_sock(sk);
1419
1420 do {
1421 struct sk_buff *next = skb->next;
1422
1423 skb->next = NULL;
c57943a1 1424 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1425
1426 /*
1427 * We are in process context here with softirqs
1428 * disabled, use cond_resched_softirq() to preempt.
1429 * This is safe to do because we've taken the backlog
1430 * queue private:
1431 */
1432 cond_resched_softirq();
1433
1434 skb = next;
1435 } while (skb != NULL);
1436
1437 bh_lock_sock(sk);
e71a4783 1438 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1439}
1440
1441/**
1442 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1443 * @sk: sock to wait on
1444 * @timeo: for how long
1da177e4
LT		 1445 *
1446 * Now socket state including sk->sk_err is changed only under lock,
1447 * hence we may omit checks after joining wait queue.
1448 * We check receive queue before schedule() only as optimization;
1449 * it is very likely that release_sock() added new data.
1450 */
1451int sk_wait_data(struct sock *sk, long *timeo)
1452{
1453 int rc;
1454 DEFINE_WAIT(wait);
1455
1456 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1457 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1458 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1459 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1460 finish_wait(sk->sk_sleep, &wait);
1461 return rc;
1462}
1463
1464EXPORT_SYMBOL(sk_wait_data);
1465
3ab224be
HA		 1466/**
1467 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1468 * @sk: socket
1469 * @size: memory size to allocate
1470 * @kind: allocation type
1471 *
1472 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1473 * rmem allocation. This function assumes that protocols which have
1474 * memory_pressure use sk_wmem_queued as write buffer accounting.
1475 */
1476int __sk_mem_schedule(struct sock *sk, int size, int kind)
1477{
1478 struct proto *prot = sk->sk_prot;
1479 int amt = sk_mem_pages(size);
1480 int allocated;
1481
1482 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1483 allocated = atomic_add_return(amt, prot->memory_allocated);
1484
1485 /* Under limit. */
1486 if (allocated <= prot->sysctl_mem[0]) {
1487 if (prot->memory_pressure && *prot->memory_pressure)
1488 *prot->memory_pressure = 0;
1489 return 1;
1490 }
1491
1492 /* Under pressure. */
1493 if (allocated > prot->sysctl_mem[1])
1494 if (prot->enter_memory_pressure)
5c52ba17 1495 prot->enter_memory_pressure(sk);
3ab224be
HA		 1496
1497 /* Over hard limit. */
1498 if (allocated > prot->sysctl_mem[2])
1499 goto suppress_allocation;
1500
1501 /* guarantee minimum buffer size under pressure */
1502 if (kind == SK_MEM_RECV) {
1503 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1504 return 1;
1505 } else { /* SK_MEM_SEND */
1506 if (sk->sk_type == SOCK_STREAM) {
1507 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1508 return 1;
1509 } else if (atomic_read(&sk->sk_wmem_alloc) <
1510 prot->sysctl_wmem[0])
1511 return 1;
1512 }
1513
1514 if (prot->memory_pressure) {
1748376b
ED		 1515 int alloc;
1516
1517 if (!*prot->memory_pressure)
1518 return 1;
1519 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1520 if (prot->sysctl_mem[2] > alloc *
3ab224be
HA		 1521 sk_mem_pages(sk->sk_wmem_queued +
1522 atomic_read(&sk->sk_rmem_alloc) +
1523 sk->sk_forward_alloc))
1524 return 1;
1525 }
1526
1527suppress_allocation:
1528
1529 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1530 sk_stream_moderate_sndbuf(sk);
1531
1532 /* Fail only if socket is _under_ its sndbuf.
1533 * In this case we cannot block, so that we have to fail.
1534 */
1535 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1536 return 1;
1537 }
1538
1539 /* Alas. Undo changes. */
1540 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1541 atomic_sub(amt, prot->memory_allocated);
1542 return 0;
1543}
1544
1545EXPORT_SYMBOL(__sk_mem_schedule);
1546
1547/**
1548 * __sk_reclaim - reclaim memory_allocated
1549 * @sk: socket
1550 */
1551void __sk_mem_reclaim(struct sock *sk)
1552{
1553 struct proto *prot = sk->sk_prot;
1554
680a5a50 1555 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1556 prot->memory_allocated);
1557 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1558
1559 if (prot->memory_pressure && *prot->memory_pressure &&
1560 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1561 *prot->memory_pressure = 0;
1562}
1563
1564EXPORT_SYMBOL(__sk_mem_reclaim);
1565
1566
1da177e4
LT		 1567/*
1568 * Set of default routines for initialising struct proto_ops when
1569 * the protocol does not support a particular function. In certain
1570 * cases where it makes no sense for a protocol to have a "do nothing"
1571 * function, some default processing is provided.
1572 */
1573
1574int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1575{
1576 return -EOPNOTSUPP;
1577}
1578
4ec93edb 1579int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1580 int len, int flags)
1581{
1582 return -EOPNOTSUPP;
1583}
1584
1585int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1586{
1587 return -EOPNOTSUPP;
1588}
1589
1590int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1591{
1592 return -EOPNOTSUPP;
1593}
1594
4ec93edb 1595int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1596 int *len, int peer)
1597{
1598 return -EOPNOTSUPP;
1599}
1600
1601unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1602{
1603 return 0;
1604}
1605
1606int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1607{
1608 return -EOPNOTSUPP;
1609}
1610
1611int sock_no_listen(struct socket *sock, int backlog)
1612{
1613 return -EOPNOTSUPP;
1614}
1615
1616int sock_no_shutdown(struct socket *sock, int how)
1617{
1618 return -EOPNOTSUPP;
1619}
1620
1621int sock_no_setsockopt(struct socket *sock, int level, int optname,
1622 char __user *optval, int optlen)
1623{
1624 return -EOPNOTSUPP;
1625}
1626
1627int sock_no_getsockopt(struct socket *sock, int level, int optname,
1628 char __user *optval, int __user *optlen)
1629{
1630 return -EOPNOTSUPP;
1631}
1632
1633int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1634 size_t len)
1635{
1636 return -EOPNOTSUPP;
1637}
1638
1639int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1640 size_t len, int flags)
1641{
1642 return -EOPNOTSUPP;
1643}
1644
1645int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1646{
1647 /* Mirror missing mmap method error code */
1648 return -ENODEV;
1649}
1650
1651ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1652{
1653 ssize_t res;
1654 struct msghdr msg = {.msg_flags = flags};
1655 struct kvec iov;
1656 char *kaddr = kmap(page);
1657 iov.iov_base = kaddr + offset;
1658 iov.iov_len = size;
1659 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1660 kunmap(page);
1661 return res;
1662}
1663
1664/*
1665 * Default Socket Callbacks
1666 */
1667
1668static void sock_def_wakeup(struct sock *sk)
1669{
1670 read_lock(&sk->sk_callback_lock);
1671 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1672 wake_up_interruptible_all(sk->sk_sleep);
1673 read_unlock(&sk->sk_callback_lock);
1674}
1675
1676static void sock_def_error_report(struct sock *sk)
1677{
1678 read_lock(&sk->sk_callback_lock);
1679 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1680 wake_up_interruptible(sk->sk_sleep);
8d8ad9d7 1681 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1da177e4
LT		 1682 read_unlock(&sk->sk_callback_lock);
1683}
1684
1685static void sock_def_readable(struct sock *sk, int len)
1686{
1687 read_lock(&sk->sk_callback_lock);
1688 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
6f3d0929 1689 wake_up_interruptible_sync(sk->sk_sleep);
8d8ad9d7 1690 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1da177e4
LT		 1691 read_unlock(&sk->sk_callback_lock);
1692}
1693
1694static void sock_def_write_space(struct sock *sk)
1695{
1696 read_lock(&sk->sk_callback_lock);
1697
1698 /* Do not wake up a writer until he can make "significant"
1699 * progress. --DaveM
1700 */
e71a4783 1701 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1da177e4 1702 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
6f3d0929 1703 wake_up_interruptible_sync(sk->sk_sleep);
1da177e4
LT		 1704
1705 /* Should agree with poll, otherwise some programs break */
1706 if (sock_writeable(sk))
8d8ad9d7 1707 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1708 }
1709
1710 read_unlock(&sk->sk_callback_lock);
1711}
1712
1713static void sock_def_destruct(struct sock *sk)
1714{
a51482bd 1715 kfree(sk->sk_protinfo);
1da177e4
LT		 1716}
1717
1718void sk_send_sigurg(struct sock *sk)
1719{
1720 if (sk->sk_socket && sk->sk_socket->file)
1721 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1722 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4
LT		 1723}
1724
1725void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1726 unsigned long expires)
1727{
1728 if (!mod_timer(timer, expires))
1729 sock_hold(sk);
1730}
1731
1732EXPORT_SYMBOL(sk_reset_timer);
1733
1734void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1735{
1736 if (timer_pending(timer) && del_timer(timer))
1737 __sock_put(sk);
1738}
1739
1740EXPORT_SYMBOL(sk_stop_timer);
1741
1742void sock_init_data(struct socket *sock, struct sock *sk)
1743{
1744 skb_queue_head_init(&sk->sk_receive_queue);
1745 skb_queue_head_init(&sk->sk_write_queue);
1746 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1747#ifdef CONFIG_NET_DMA
1748 skb_queue_head_init(&sk->sk_async_wait_queue);
1749#endif
1da177e4
LT		 1750
1751 sk->sk_send_head = NULL;
1752
1753 init_timer(&sk->sk_timer);
4ec93edb 1754
1da177e4
LT		 1755 sk->sk_allocation = GFP_KERNEL;
1756 sk->sk_rcvbuf = sysctl_rmem_default;
1757 sk->sk_sndbuf = sysctl_wmem_default;
1758 sk->sk_state = TCP_CLOSE;
972692e0 1759 sk_set_socket(sk, sock);
1da177e4
LT		 1760
1761 sock_set_flag(sk, SOCK_ZAPPED);
1762
e71a4783 1763 if (sock) {
1da177e4
LT		 1764 sk->sk_type = sock->type;
1765 sk->sk_sleep = &sock->wait;
1766 sock->sk = sk;
1767 } else
1768 sk->sk_sleep = NULL;
1769
1770 rwlock_init(&sk->sk_dst_lock);
1771 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1772 lockdep_set_class_and_name(&sk->sk_callback_lock,
1773 af_callback_keys + sk->sk_family,
1774 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1775
1776 sk->sk_state_change = sock_def_wakeup;
1777 sk->sk_data_ready = sock_def_readable;
1778 sk->sk_write_space = sock_def_write_space;
1779 sk->sk_error_report = sock_def_error_report;
1780 sk->sk_destruct = sock_def_destruct;
1781
1782 sk->sk_sndmsg_page = NULL;
1783 sk->sk_sndmsg_off = 0;
1784
1785 sk->sk_peercred.pid = 0;
1786 sk->sk_peercred.uid = -1;
1787 sk->sk_peercred.gid = -1;
1788 sk->sk_write_pending = 0;
1789 sk->sk_rcvlowat = 1;
1790 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1791 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1792
f37f0afb 1793 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4
LT		 1794
1795 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1796 atomic_set(&sk->sk_drops, 0);
1da177e4
LT		 1797}
1798
b5606c2d 1799void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1800{
1801 might_sleep();
a5b5bb9a 1802 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1803 if (sk->sk_lock.owned)
1da177e4 1804 __lock_sock(sk);
d2e9117c 1805 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1806 spin_unlock(&sk->sk_lock.slock);
1807 /*
1808 * The sk_lock has mutex_lock() semantics here:
1809 */
fcc70d5f 1810 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1811 local_bh_enable();
1da177e4
LT		 1812}
1813
fcc70d5f 1814EXPORT_SYMBOL(lock_sock_nested);
1da177e4 1815
b5606c2d 1816void release_sock(struct sock *sk)
1da177e4 1817{
a5b5bb9a
IM		 1818 /*
1819 * The sk_lock has mutex_unlock() semantics:
1820 */
1821 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1822
1823 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1824 if (sk->sk_backlog.tail)
1825 __release_sock(sk);
d2e9117c 1826 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1827 if (waitqueue_active(&sk->sk_lock.wq))
1828 wake_up(&sk->sk_lock.wq);
1829 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1830}
1831EXPORT_SYMBOL(release_sock);
1832
1833int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1834{
b7aa0bf7 1835 struct timeval tv;
1da177e4 1836 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 1837 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 1838 tv = ktime_to_timeval(sk->sk_stamp);
1839 if (tv.tv_sec == -1)
1da177e4 1840 return -ENOENT;
b7aa0bf7
ED		 1841 if (tv.tv_sec == 0) {
1842 sk->sk_stamp = ktime_get_real();
1843 tv = ktime_to_timeval(sk->sk_stamp);
1844 }
1845 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1846}
1da177e4
LT		 1847EXPORT_SYMBOL(sock_get_timestamp);
1848
ae40eb1e
ED		 1849int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1850{
1851 struct timespec ts;
1852 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 1853 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 1854 ts = ktime_to_timespec(sk->sk_stamp);
1855 if (ts.tv_sec == -1)
1856 return -ENOENT;
1857 if (ts.tv_sec == 0) {
1858 sk->sk_stamp = ktime_get_real();
1859 ts = ktime_to_timespec(sk->sk_stamp);
1860 }
1861 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1862}
1863EXPORT_SYMBOL(sock_get_timestampns);
1864
20d49473 1865void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 1866{
20d49473
PO		 1867 if (!sock_flag(sk, flag)) {
1868 sock_set_flag(sk, flag);
1869 /*
1870 * we just set one of the two flags which require net
1871 * time stamping, but time stamping might have been on
1872 * already because of the other one
1873 */
1874 if (!sock_flag(sk,
1875 flag == SOCK_TIMESTAMP ?
1876 SOCK_TIMESTAMPING_RX_SOFTWARE :
1877 SOCK_TIMESTAMP))
1878 net_enable_timestamp();
1da177e4
LT		 1879 }
1880}
1da177e4
LT		 1881
1882/*
1883 * Get a socket option on an socket.
1884 *
1885 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1886 * asynchronous errors should be reported by getsockopt. We assume
1887 * this means if you specify SO_ERROR (otherwise whats the point of it).
1888 */
1889int sock_common_getsockopt(struct socket *sock, int level, int optname,
1890 char __user *optval, int __user *optlen)
1891{
1892 struct sock *sk = sock->sk;
1893
1894 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1895}
1896
1897EXPORT_SYMBOL(sock_common_getsockopt);
1898
3fdadf7d 1899#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1900int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1901 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1902{
1903 struct sock *sk = sock->sk;
1904
1e51f951 1905 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 1906 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1907 optval, optlen);
3fdadf7d
DM		 1908 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1909}
1910EXPORT_SYMBOL(compat_sock_common_getsockopt);
1911#endif
1912
1da177e4
LT		 1913int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1914 struct msghdr *msg, size_t size, int flags)
1915{
1916 struct sock *sk = sock->sk;
1917 int addr_len = 0;
1918 int err;
1919
1920 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1921 flags & ~MSG_DONTWAIT, &addr_len);
1922 if (err >= 0)
1923 msg->msg_namelen = addr_len;
1924 return err;
1925}
1926
1927EXPORT_SYMBOL(sock_common_recvmsg);
1928
1929/*
1930 * Set socket options on an inet socket.
1931 */
1932int sock_common_setsockopt(struct socket *sock, int level, int optname,
1933 char __user *optval, int optlen)
1934{
1935 struct sock *sk = sock->sk;
1936
1937 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1938}
1939
1940EXPORT_SYMBOL(sock_common_setsockopt);
1941
3fdadf7d 1942#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1943int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1944 char __user *optval, int optlen)
3fdadf7d
DM		 1945{
1946 struct sock *sk = sock->sk;
1947
543d9cfe
ACM		 1948 if (sk->sk_prot->compat_setsockopt != NULL)
1949 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1950 optval, optlen);
3fdadf7d
DM		 1951 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1952}
1953EXPORT_SYMBOL(compat_sock_common_setsockopt);
1954#endif
1955
1da177e4
LT		 1956void sk_common_release(struct sock *sk)
1957{
1958 if (sk->sk_prot->destroy)
1959 sk->sk_prot->destroy(sk);
1960
1961 /*
1962 * Observation: when sock_common_release is called, processes have
1963 * no access to socket. But net still has.
1964 * Step one, detach it from networking:
1965 *
1966 * A. Remove from hash tables.
1967 */
1968
1969 sk->sk_prot->unhash(sk);
1970
1971 /*
1972 * In this point socket cannot receive new packets, but it is possible
1973 * that some packets are in flight because some CPU runs receiver and
1974 * did hash table lookup before we unhashed socket. They will achieve
1975 * receive queue and will be purged by socket destructor.
1976 *
1977 * Also we still have packets pending on receive queue and probably,
1978 * our own packets waiting in device queues. sock_destroy will drain
1979 * receive queue, but transmitted packets will delay socket destruction
1980 * until the last reference will be released.
1981 */
1982
1983 sock_orphan(sk);
1984
1985 xfrm_sk_free_policy(sk);
1986
e6848976 1987 sk_refcnt_debug_release(sk);
1da177e4
LT		 1988 sock_put(sk);
1989}
1990
1991EXPORT_SYMBOL(sk_common_release);
1992
1993static DEFINE_RWLOCK(proto_list_lock);
1994static LIST_HEAD(proto_list);
1995
13ff3d6f
PE		 1996#ifdef CONFIG_PROC_FS
1997#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 1998struct prot_inuse {
1999 int val[PROTO_INUSE_NR];
2000};
13ff3d6f
PE		 2001
2002static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2003
2004#ifdef CONFIG_NET_NS
2005void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2006{
2007 int cpu = smp_processor_id();
2008 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
2009}
2010EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2011
2012int sock_prot_inuse_get(struct net *net, struct proto *prot)
2013{
2014 int cpu, idx = prot->inuse_idx;
2015 int res = 0;
2016
2017 for_each_possible_cpu(cpu)
2018 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2019
2020 return res >= 0 ? res : 0;
2021}
2022EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2023
2024static int sock_inuse_init_net(struct net *net)
2025{
2026 net->core.inuse = alloc_percpu(struct prot_inuse);
2027 return net->core.inuse ? 0 : -ENOMEM;
2028}
2029
2030static void sock_inuse_exit_net(struct net *net)
2031{
2032 free_percpu(net->core.inuse);
2033}
2034
2035static struct pernet_operations net_inuse_ops = {
2036 .init = sock_inuse_init_net,
2037 .exit = sock_inuse_exit_net,
2038};
2039
2040static __init int net_inuse_init(void)
2041{
2042 if (register_pernet_subsys(&net_inuse_ops))
2043 panic("Cannot initialize net inuse counters");
2044
2045 return 0;
2046}
2047
2048core_initcall(net_inuse_init);
2049#else
1338d466
PE		 2050static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2051
c29a0bc4 2052void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466
PE		 2053{
2054 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
2055}
2056EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2057
c29a0bc4 2058int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2059{
2060 int cpu, idx = prot->inuse_idx;
2061 int res = 0;
2062
2063 for_each_possible_cpu(cpu)
2064 res += per_cpu(prot_inuse, cpu).val[idx];
2065
2066 return res >= 0 ? res : 0;
2067}
2068EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2069#endif
13ff3d6f
PE		 2070
2071static void assign_proto_idx(struct proto *prot)
2072{
2073 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2074
2075 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2076 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2077 return;
2078 }
2079
2080 set_bit(prot->inuse_idx, proto_inuse_idx);
2081}
2082
2083static void release_proto_idx(struct proto *prot)
2084{
2085 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2086 clear_bit(prot->inuse_idx, proto_inuse_idx);
2087}
2088#else
2089static inline void assign_proto_idx(struct proto *prot)
2090{
2091}
2092
2093static inline void release_proto_idx(struct proto *prot)
2094{
2095}
2096#endif
2097
b733c007
PE		 2098int proto_register(struct proto *prot, int alloc_slab)
2099{
1da177e4
LT		 2100 if (alloc_slab) {
2101 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2102 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2103 NULL);
1da177e4
LT		 2104
2105 if (prot->slab == NULL) {
2106 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2107 prot->name);
60e7663d 2108 goto out;
1da177e4 2109 }
2e6599cb
ACM		 2110
2111 if (prot->rsk_prot != NULL) {
2112 static const char mask[] = "request_sock_%s";
2113
7e56b5d6
CM		 2114 prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2115 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2116 goto out_free_sock_slab;
2117
7e56b5d6
CM		 2118 sprintf(prot->rsk_prot->slab_name, mask, prot->name);
2119 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2120 prot->rsk_prot->obj_size, 0,
20c2df83 2121 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2122
2123 if (prot->rsk_prot->slab == NULL) {
2124 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2125 prot->name);
2126 goto out_free_request_sock_slab_name;
2127 }
2128 }
8feaf0c0 2129
6d6ee43e 2130 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 2131 static const char mask[] = "tw_sock_%s";
2132
7e56b5d6 2133 prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
8feaf0c0 2134
7e56b5d6 2135 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2136 goto out_free_request_sock_slab;
2137
7e56b5d6 2138 sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name);
6d6ee43e 2139 prot->twsk_prot->twsk_slab =
7e56b5d6 2140 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2141 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2142 0,
2143 SLAB_HWCACHE_ALIGN |
2144 prot->slab_flags,
20c2df83 2145 NULL);
6d6ee43e 2146 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2147 goto out_free_timewait_sock_slab_name;
2148 }
1da177e4
LT		 2149 }
2150
2a278051 2151 write_lock(&proto_list_lock);
1da177e4 2152 list_add(&prot->node, &proto_list);
13ff3d6f 2153 assign_proto_idx(prot);
1da177e4 2154 write_unlock(&proto_list_lock);
b733c007
PE		 2155 return 0;
2156
8feaf0c0 2157out_free_timewait_sock_slab_name:
7e56b5d6 2158 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2159out_free_request_sock_slab:
2160 if (prot->rsk_prot && prot->rsk_prot->slab) {
2161 kmem_cache_destroy(prot->rsk_prot->slab);
2162 prot->rsk_prot->slab = NULL;
2163 }
2e6599cb 2164out_free_request_sock_slab_name:
7e56b5d6 2165 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2166out_free_sock_slab:
2167 kmem_cache_destroy(prot->slab);
2168 prot->slab = NULL;
b733c007
PE		 2169out:
2170 return -ENOBUFS;
1da177e4
LT		 2171}
2172
2173EXPORT_SYMBOL(proto_register);
2174
2175void proto_unregister(struct proto *prot)
2176{
2177 write_lock(&proto_list_lock);
13ff3d6f 2178 release_proto_idx(prot);
0a3f4358
PM		 2179 list_del(&prot->node);
2180 write_unlock(&proto_list_lock);
1da177e4
LT		 2181
2182 if (prot->slab != NULL) {
2183 kmem_cache_destroy(prot->slab);
2184 prot->slab = NULL;
2185 }
2186
2e6599cb 2187 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2188 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2189 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2190 prot->rsk_prot->slab = NULL;
2191 }
2192
6d6ee43e 2193 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2194 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2195 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2196 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2197 }
1da177e4
LT		 2198}
2199
2200EXPORT_SYMBOL(proto_unregister);
2201
2202#ifdef CONFIG_PROC_FS
1da177e4 2203static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2204 __acquires(proto_list_lock)
1da177e4
LT		 2205{
2206 read_lock(&proto_list_lock);
60f0438a 2207 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2208}
2209
2210static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2211{
60f0438a 2212 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2213}
2214
2215static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2216 __releases(proto_list_lock)
1da177e4
LT		 2217{
2218 read_unlock(&proto_list_lock);
2219}
2220
2221static char proto_method_implemented(const void *method)
2222{
2223 return method == NULL ? 'n' : 'y';
2224}
2225
2226static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2227{
2228 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2229 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2230 proto->name,
2231 proto->obj_size,
14e943db 2232 sock_prot_inuse_get(seq_file_net(seq), proto),
1da177e4
LT		 2233 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2234 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2235 proto->max_header,
2236 proto->slab == NULL ? "no" : "yes",
2237 module_name(proto->owner),
2238 proto_method_implemented(proto->close),
2239 proto_method_implemented(proto->connect),
2240 proto_method_implemented(proto->disconnect),
2241 proto_method_implemented(proto->accept),
2242 proto_method_implemented(proto->ioctl),
2243 proto_method_implemented(proto->init),
2244 proto_method_implemented(proto->destroy),
2245 proto_method_implemented(proto->shutdown),
2246 proto_method_implemented(proto->setsockopt),
2247 proto_method_implemented(proto->getsockopt),
2248 proto_method_implemented(proto->sendmsg),
2249 proto_method_implemented(proto->recvmsg),
2250 proto_method_implemented(proto->sendpage),
2251 proto_method_implemented(proto->bind),
2252 proto_method_implemented(proto->backlog_rcv),
2253 proto_method_implemented(proto->hash),
2254 proto_method_implemented(proto->unhash),
2255 proto_method_implemented(proto->get_port),
2256 proto_method_implemented(proto->enter_memory_pressure));
2257}
2258
2259static int proto_seq_show(struct seq_file *seq, void *v)
2260{
60f0438a 2261 if (v == &proto_list)
1da177e4
LT		 2262 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2263 "protocol",
2264 "size",
2265 "sockets",
2266 "memory",
2267 "press",
2268 "maxhdr",
2269 "slab",
2270 "module",
2271 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2272 else
60f0438a 2273 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2274 return 0;
2275}
2276
f690808e 2277static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2278 .start = proto_seq_start,
2279 .next = proto_seq_next,
2280 .stop = proto_seq_stop,
2281 .show = proto_seq_show,
2282};
2283
2284static int proto_seq_open(struct inode *inode, struct file *file)
2285{
14e943db
ED		 2286 return seq_open_net(inode, file, &proto_seq_ops,
2287 sizeof(struct seq_net_private));
1da177e4
LT		 2288}
2289
9a32144e 2290static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2291 .owner = THIS_MODULE,
2292 .open = proto_seq_open,
2293 .read = seq_read,
2294 .llseek = seq_lseek,
14e943db
ED		 2295 .release = seq_release_net,
2296};
2297
2298static __net_init int proto_init_net(struct net *net)
2299{
2300 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2301 return -ENOMEM;
2302
2303 return 0;
2304}
2305
2306static __net_exit void proto_exit_net(struct net *net)
2307{
2308 proc_net_remove(net, "protocols");
2309}
2310
2311
2312static __net_initdata struct pernet_operations proto_net_ops = {
2313 .init = proto_init_net,
2314 .exit = proto_exit_net,
1da177e4
LT		 2315};
2316
2317static int __init proto_init(void)
2318{
14e943db 2319 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2320}
2321
2322subsys_initcall(proto_init);
2323
2324#endif /* PROC_FS */
2325
2326EXPORT_SYMBOL(sk_alloc);
2327EXPORT_SYMBOL(sk_free);
2328EXPORT_SYMBOL(sk_send_sigurg);
2329EXPORT_SYMBOL(sock_alloc_send_skb);
2330EXPORT_SYMBOL(sock_init_data);
2331EXPORT_SYMBOL(sock_kfree_s);
2332EXPORT_SYMBOL(sock_kmalloc);
2333EXPORT_SYMBOL(sock_no_accept);
2334EXPORT_SYMBOL(sock_no_bind);
2335EXPORT_SYMBOL(sock_no_connect);
2336EXPORT_SYMBOL(sock_no_getname);
2337EXPORT_SYMBOL(sock_no_getsockopt);
2338EXPORT_SYMBOL(sock_no_ioctl);
2339EXPORT_SYMBOL(sock_no_listen);
2340EXPORT_SYMBOL(sock_no_mmap);
2341EXPORT_SYMBOL(sock_no_poll);
2342EXPORT_SYMBOL(sock_no_recvmsg);
2343EXPORT_SYMBOL(sock_no_sendmsg);
2344EXPORT_SYMBOL(sock_no_sendpage);
2345EXPORT_SYMBOL(sock_no_setsockopt);
2346EXPORT_SYMBOL(sock_no_shutdown);
2347EXPORT_SYMBOL(sock_no_socketpair);
2348EXPORT_SYMBOL(sock_rfree);
2349EXPORT_SYMBOL(sock_setsockopt);
2350EXPORT_SYMBOL(sock_wfree);
2351EXPORT_SYMBOL(sock_wmalloc);
2352EXPORT_SYMBOL(sock_i_uid);
2353EXPORT_SYMBOL(sock_i_ino);
1da177e4 2354EXPORT_SYMBOL(sysctl_optmem_max);
Linux kernel - Deliverables
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