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net: socket infrastructure for SO_TIMESTAMPING
[GitHub/LineageOS/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 *
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
df0bca04
CL		 728 v.val = 0;
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
3ab224be 1188 skb_truesize_check(skb);
1da177e4 1189 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1190 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4
LT		 1191}
1192
1193
1194int sock_i_uid(struct sock *sk)
1195{
1196 int uid;
1197
1198 read_lock(&sk->sk_callback_lock);
1199 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1200 read_unlock(&sk->sk_callback_lock);
1201 return uid;
1202}
1203
1204unsigned long sock_i_ino(struct sock *sk)
1205{
1206 unsigned long ino;
1207
1208 read_lock(&sk->sk_callback_lock);
1209 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1210 read_unlock(&sk->sk_callback_lock);
1211 return ino;
1212}
1213
1214/*
1215 * Allocate a skb from the socket's send buffer.
1216 */
86a76caf 1217struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1218 gfp_t priority)
1da177e4
LT		 1219{
1220 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1221 struct sk_buff * skb = alloc_skb(size, priority);
1222 if (skb) {
1223 skb_set_owner_w(skb, sk);
1224 return skb;
1225 }
1226 }
1227 return NULL;
1228}
1229
1230/*
1231 * Allocate a skb from the socket's receive buffer.
4ec93edb 1232 */
86a76caf 1233struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1234 gfp_t priority)
1da177e4
LT		 1235{
1236 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1237 struct sk_buff *skb = alloc_skb(size, priority);
1238 if (skb) {
1239 skb_set_owner_r(skb, sk);
1240 return skb;
1241 }
1242 }
1243 return NULL;
1244}
1245
4ec93edb 1246/*
1da177e4 1247 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1248 */
dd0fc66f 1249void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1250{
1251 if ((unsigned)size <= sysctl_optmem_max &&
1252 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1253 void *mem;
1254 /* First do the add, to avoid the race if kmalloc
4ec93edb 1255 * might sleep.
1da177e4
LT		 1256 */
1257 atomic_add(size, &sk->sk_omem_alloc);
1258 mem = kmalloc(size, priority);
1259 if (mem)
1260 return mem;
1261 atomic_sub(size, &sk->sk_omem_alloc);
1262 }
1263 return NULL;
1264}
1265
1266/*
1267 * Free an option memory block.
1268 */
1269void sock_kfree_s(struct sock *sk, void *mem, int size)
1270{
1271 kfree(mem);
1272 atomic_sub(size, &sk->sk_omem_alloc);
1273}
1274
1275/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1276 I think, these locks should be removed for datagram sockets.
1277 */
1278static long sock_wait_for_wmem(struct sock * sk, long timeo)
1279{
1280 DEFINE_WAIT(wait);
1281
1282 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1283 for (;;) {
1284 if (!timeo)
1285 break;
1286 if (signal_pending(current))
1287 break;
1288 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1289 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1290 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1291 break;
1292 if (sk->sk_shutdown & SEND_SHUTDOWN)
1293 break;
1294 if (sk->sk_err)
1295 break;
1296 timeo = schedule_timeout(timeo);
1297 }
1298 finish_wait(sk->sk_sleep, &wait);
1299 return timeo;
1300}
1301
1302
1303/*
1304 * Generic send/receive buffer handlers
1305 */
1306
4cc7f68d
HX		 1307struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1308 unsigned long data_len, int noblock,
1309 int *errcode)
1da177e4
LT		 1310{
1311 struct sk_buff *skb;
7d877f3b 1312 gfp_t gfp_mask;
1da177e4
LT		 1313 long timeo;
1314 int err;
1315
1316 gfp_mask = sk->sk_allocation;
1317 if (gfp_mask & __GFP_WAIT)
1318 gfp_mask |= __GFP_REPEAT;
1319
1320 timeo = sock_sndtimeo(sk, noblock);
1321 while (1) {
1322 err = sock_error(sk);
1323 if (err != 0)
1324 goto failure;
1325
1326 err = -EPIPE;
1327 if (sk->sk_shutdown & SEND_SHUTDOWN)
1328 goto failure;
1329
1330 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1331 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1332 if (skb) {
1333 int npages;
1334 int i;
1335
1336 /* No pages, we're done... */
1337 if (!data_len)
1338 break;
1339
1340 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1341 skb->truesize += data_len;
1342 skb_shinfo(skb)->nr_frags = npages;
1343 for (i = 0; i < npages; i++) {
1344 struct page *page;
1345 skb_frag_t *frag;
1346
1347 page = alloc_pages(sk->sk_allocation, 0);
1348 if (!page) {
1349 err = -ENOBUFS;
1350 skb_shinfo(skb)->nr_frags = i;
1351 kfree_skb(skb);
1352 goto failure;
1353 }
1354
1355 frag = &skb_shinfo(skb)->frags[i];
1356 frag->page = page;
1357 frag->page_offset = 0;
1358 frag->size = (data_len >= PAGE_SIZE ?
1359 PAGE_SIZE :
1360 data_len);
1361 data_len -= PAGE_SIZE;
1362 }
1363
1364 /* Full success... */
1365 break;
1366 }
1367 err = -ENOBUFS;
1368 goto failure;
1369 }
1370 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1371 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1372 err = -EAGAIN;
1373 if (!timeo)
1374 goto failure;
1375 if (signal_pending(current))
1376 goto interrupted;
1377 timeo = sock_wait_for_wmem(sk, timeo);
1378 }
1379
1380 skb_set_owner_w(skb, sk);
1381 return skb;
1382
1383interrupted:
1384 err = sock_intr_errno(timeo);
1385failure:
1386 *errcode = err;
1387 return NULL;
1388}
4cc7f68d 1389EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1390
4ec93edb 1391struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1392 int noblock, int *errcode)
1393{
1394 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1395}
1396
1397static void __lock_sock(struct sock *sk)
1398{
1399 DEFINE_WAIT(wait);
1400
e71a4783 1401 for (;;) {
1da177e4
LT		 1402 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1403 TASK_UNINTERRUPTIBLE);
1404 spin_unlock_bh(&sk->sk_lock.slock);
1405 schedule();
1406 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1407 if (!sock_owned_by_user(sk))
1da177e4
LT		 1408 break;
1409 }
1410 finish_wait(&sk->sk_lock.wq, &wait);
1411}
1412
1413static void __release_sock(struct sock *sk)
1414{
1415 struct sk_buff *skb = sk->sk_backlog.head;
1416
1417 do {
1418 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1419 bh_unlock_sock(sk);
1420
1421 do {
1422 struct sk_buff *next = skb->next;
1423
1424 skb->next = NULL;
c57943a1 1425 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1426
1427 /*
1428 * We are in process context here with softirqs
1429 * disabled, use cond_resched_softirq() to preempt.
1430 * This is safe to do because we've taken the backlog
1431 * queue private:
1432 */
1433 cond_resched_softirq();
1434
1435 skb = next;
1436 } while (skb != NULL);
1437
1438 bh_lock_sock(sk);
e71a4783 1439 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1440}
1441
1442/**
1443 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1444 * @sk: sock to wait on
1445 * @timeo: for how long
1da177e4
LT		 1446 *
1447 * Now socket state including sk->sk_err is changed only under lock,
1448 * hence we may omit checks after joining wait queue.
1449 * We check receive queue before schedule() only as optimization;
1450 * it is very likely that release_sock() added new data.
1451 */
1452int sk_wait_data(struct sock *sk, long *timeo)
1453{
1454 int rc;
1455 DEFINE_WAIT(wait);
1456
1457 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1458 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1459 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1460 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1461 finish_wait(sk->sk_sleep, &wait);
1462 return rc;
1463}
1464
1465EXPORT_SYMBOL(sk_wait_data);
1466
3ab224be
HA		 1467/**
1468 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1469 * @sk: socket
1470 * @size: memory size to allocate
1471 * @kind: allocation type
1472 *
1473 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1474 * rmem allocation. This function assumes that protocols which have
1475 * memory_pressure use sk_wmem_queued as write buffer accounting.
1476 */
1477int __sk_mem_schedule(struct sock *sk, int size, int kind)
1478{
1479 struct proto *prot = sk->sk_prot;
1480 int amt = sk_mem_pages(size);
1481 int allocated;
1482
1483 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1484 allocated = atomic_add_return(amt, prot->memory_allocated);
1485
1486 /* Under limit. */
1487 if (allocated <= prot->sysctl_mem[0]) {
1488 if (prot->memory_pressure && *prot->memory_pressure)
1489 *prot->memory_pressure = 0;
1490 return 1;
1491 }
1492
1493 /* Under pressure. */
1494 if (allocated > prot->sysctl_mem[1])
1495 if (prot->enter_memory_pressure)
5c52ba17 1496 prot->enter_memory_pressure(sk);
3ab224be
HA		 1497
1498 /* Over hard limit. */
1499 if (allocated > prot->sysctl_mem[2])
1500 goto suppress_allocation;
1501
1502 /* guarantee minimum buffer size under pressure */
1503 if (kind == SK_MEM_RECV) {
1504 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1505 return 1;
1506 } else { /* SK_MEM_SEND */
1507 if (sk->sk_type == SOCK_STREAM) {
1508 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1509 return 1;
1510 } else if (atomic_read(&sk->sk_wmem_alloc) <
1511 prot->sysctl_wmem[0])
1512 return 1;
1513 }
1514
1515 if (prot->memory_pressure) {
1748376b
ED		 1516 int alloc;
1517
1518 if (!*prot->memory_pressure)
1519 return 1;
1520 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1521 if (prot->sysctl_mem[2] > alloc *
3ab224be
HA		 1522 sk_mem_pages(sk->sk_wmem_queued +
1523 atomic_read(&sk->sk_rmem_alloc) +
1524 sk->sk_forward_alloc))
1525 return 1;
1526 }
1527
1528suppress_allocation:
1529
1530 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1531 sk_stream_moderate_sndbuf(sk);
1532
1533 /* Fail only if socket is _under_ its sndbuf.
1534 * In this case we cannot block, so that we have to fail.
1535 */
1536 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1537 return 1;
1538 }
1539
1540 /* Alas. Undo changes. */
1541 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1542 atomic_sub(amt, prot->memory_allocated);
1543 return 0;
1544}
1545
1546EXPORT_SYMBOL(__sk_mem_schedule);
1547
1548/**
1549 * __sk_reclaim - reclaim memory_allocated
1550 * @sk: socket
1551 */
1552void __sk_mem_reclaim(struct sock *sk)
1553{
1554 struct proto *prot = sk->sk_prot;
1555
680a5a50 1556 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1557 prot->memory_allocated);
1558 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1559
1560 if (prot->memory_pressure && *prot->memory_pressure &&
1561 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1562 *prot->memory_pressure = 0;
1563}
1564
1565EXPORT_SYMBOL(__sk_mem_reclaim);
1566
1567
1da177e4
LT		 1568/*
1569 * Set of default routines for initialising struct proto_ops when
1570 * the protocol does not support a particular function. In certain
1571 * cases where it makes no sense for a protocol to have a "do nothing"
1572 * function, some default processing is provided.
1573 */
1574
1575int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1576{
1577 return -EOPNOTSUPP;
1578}
1579
4ec93edb 1580int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1581 int len, int flags)
1582{
1583 return -EOPNOTSUPP;
1584}
1585
1586int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1587{
1588 return -EOPNOTSUPP;
1589}
1590
1591int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1592{
1593 return -EOPNOTSUPP;
1594}
1595
4ec93edb 1596int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1597 int *len, int peer)
1598{
1599 return -EOPNOTSUPP;
1600}
1601
1602unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1603{
1604 return 0;
1605}
1606
1607int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1608{
1609 return -EOPNOTSUPP;
1610}
1611
1612int sock_no_listen(struct socket *sock, int backlog)
1613{
1614 return -EOPNOTSUPP;
1615}
1616
1617int sock_no_shutdown(struct socket *sock, int how)
1618{
1619 return -EOPNOTSUPP;
1620}
1621
1622int sock_no_setsockopt(struct socket *sock, int level, int optname,
1623 char __user *optval, int optlen)
1624{
1625 return -EOPNOTSUPP;
1626}
1627
1628int sock_no_getsockopt(struct socket *sock, int level, int optname,
1629 char __user *optval, int __user *optlen)
1630{
1631 return -EOPNOTSUPP;
1632}
1633
1634int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1635 size_t len)
1636{
1637 return -EOPNOTSUPP;
1638}
1639
1640int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1641 size_t len, int flags)
1642{
1643 return -EOPNOTSUPP;
1644}
1645
1646int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1647{
1648 /* Mirror missing mmap method error code */
1649 return -ENODEV;
1650}
1651
1652ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1653{
1654 ssize_t res;
1655 struct msghdr msg = {.msg_flags = flags};
1656 struct kvec iov;
1657 char *kaddr = kmap(page);
1658 iov.iov_base = kaddr + offset;
1659 iov.iov_len = size;
1660 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1661 kunmap(page);
1662 return res;
1663}
1664
1665/*
1666 * Default Socket Callbacks
1667 */
1668
1669static void sock_def_wakeup(struct sock *sk)
1670{
1671 read_lock(&sk->sk_callback_lock);
1672 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1673 wake_up_interruptible_all(sk->sk_sleep);
1674 read_unlock(&sk->sk_callback_lock);
1675}
1676
1677static void sock_def_error_report(struct sock *sk)
1678{
1679 read_lock(&sk->sk_callback_lock);
1680 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1681 wake_up_interruptible(sk->sk_sleep);
8d8ad9d7 1682 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1da177e4
LT		 1683 read_unlock(&sk->sk_callback_lock);
1684}
1685
1686static void sock_def_readable(struct sock *sk, int len)
1687{
1688 read_lock(&sk->sk_callback_lock);
1689 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
6f3d0929 1690 wake_up_interruptible_sync(sk->sk_sleep);
8d8ad9d7 1691 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1da177e4
LT		 1692 read_unlock(&sk->sk_callback_lock);
1693}
1694
1695static void sock_def_write_space(struct sock *sk)
1696{
1697 read_lock(&sk->sk_callback_lock);
1698
1699 /* Do not wake up a writer until he can make "significant"
1700 * progress. --DaveM
1701 */
e71a4783 1702 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1da177e4 1703 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
6f3d0929 1704 wake_up_interruptible_sync(sk->sk_sleep);
1da177e4
LT		 1705
1706 /* Should agree with poll, otherwise some programs break */
1707 if (sock_writeable(sk))
8d8ad9d7 1708 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1709 }
1710
1711 read_unlock(&sk->sk_callback_lock);
1712}
1713
1714static void sock_def_destruct(struct sock *sk)
1715{
a51482bd 1716 kfree(sk->sk_protinfo);
1da177e4
LT		 1717}
1718
1719void sk_send_sigurg(struct sock *sk)
1720{
1721 if (sk->sk_socket && sk->sk_socket->file)
1722 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1723 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4
LT		 1724}
1725
1726void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1727 unsigned long expires)
1728{
1729 if (!mod_timer(timer, expires))
1730 sock_hold(sk);
1731}
1732
1733EXPORT_SYMBOL(sk_reset_timer);
1734
1735void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1736{
1737 if (timer_pending(timer) && del_timer(timer))
1738 __sock_put(sk);
1739}
1740
1741EXPORT_SYMBOL(sk_stop_timer);
1742
1743void sock_init_data(struct socket *sock, struct sock *sk)
1744{
1745 skb_queue_head_init(&sk->sk_receive_queue);
1746 skb_queue_head_init(&sk->sk_write_queue);
1747 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1748#ifdef CONFIG_NET_DMA
1749 skb_queue_head_init(&sk->sk_async_wait_queue);
1750#endif
1da177e4
LT		 1751
1752 sk->sk_send_head = NULL;
1753
1754 init_timer(&sk->sk_timer);
4ec93edb 1755
1da177e4
LT		 1756 sk->sk_allocation = GFP_KERNEL;
1757 sk->sk_rcvbuf = sysctl_rmem_default;
1758 sk->sk_sndbuf = sysctl_wmem_default;
1759 sk->sk_state = TCP_CLOSE;
972692e0 1760 sk_set_socket(sk, sock);
1da177e4
LT		 1761
1762 sock_set_flag(sk, SOCK_ZAPPED);
1763
e71a4783 1764 if (sock) {
1da177e4
LT		 1765 sk->sk_type = sock->type;
1766 sk->sk_sleep = &sock->wait;
1767 sock->sk = sk;
1768 } else
1769 sk->sk_sleep = NULL;
1770
1771 rwlock_init(&sk->sk_dst_lock);
1772 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1773 lockdep_set_class_and_name(&sk->sk_callback_lock,
1774 af_callback_keys + sk->sk_family,
1775 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1776
1777 sk->sk_state_change = sock_def_wakeup;
1778 sk->sk_data_ready = sock_def_readable;
1779 sk->sk_write_space = sock_def_write_space;
1780 sk->sk_error_report = sock_def_error_report;
1781 sk->sk_destruct = sock_def_destruct;
1782
1783 sk->sk_sndmsg_page = NULL;
1784 sk->sk_sndmsg_off = 0;
1785
1786 sk->sk_peercred.pid = 0;
1787 sk->sk_peercred.uid = -1;
1788 sk->sk_peercred.gid = -1;
1789 sk->sk_write_pending = 0;
1790 sk->sk_rcvlowat = 1;
1791 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1792 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1793
f37f0afb 1794 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4
LT		 1795
1796 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1797 atomic_set(&sk->sk_drops, 0);
1da177e4
LT		 1798}
1799
b5606c2d 1800void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1801{
1802 might_sleep();
a5b5bb9a 1803 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1804 if (sk->sk_lock.owned)
1da177e4 1805 __lock_sock(sk);
d2e9117c 1806 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1807 spin_unlock(&sk->sk_lock.slock);
1808 /*
1809 * The sk_lock has mutex_lock() semantics here:
1810 */
fcc70d5f 1811 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1812 local_bh_enable();
1da177e4
LT		 1813}
1814
fcc70d5f 1815EXPORT_SYMBOL(lock_sock_nested);
1da177e4 1816
b5606c2d 1817void release_sock(struct sock *sk)
1da177e4 1818{
a5b5bb9a
IM		 1819 /*
1820 * The sk_lock has mutex_unlock() semantics:
1821 */
1822 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1823
1824 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1825 if (sk->sk_backlog.tail)
1826 __release_sock(sk);
d2e9117c 1827 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1828 if (waitqueue_active(&sk->sk_lock.wq))
1829 wake_up(&sk->sk_lock.wq);
1830 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1831}
1832EXPORT_SYMBOL(release_sock);
1833
1834int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1835{
b7aa0bf7 1836 struct timeval tv;
1da177e4 1837 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 1838 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 1839 tv = ktime_to_timeval(sk->sk_stamp);
1840 if (tv.tv_sec == -1)
1da177e4 1841 return -ENOENT;
b7aa0bf7
ED		 1842 if (tv.tv_sec == 0) {
1843 sk->sk_stamp = ktime_get_real();
1844 tv = ktime_to_timeval(sk->sk_stamp);
1845 }
1846 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1847}
1da177e4
LT		 1848EXPORT_SYMBOL(sock_get_timestamp);
1849
ae40eb1e
ED		 1850int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1851{
1852 struct timespec ts;
1853 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 1854 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 1855 ts = ktime_to_timespec(sk->sk_stamp);
1856 if (ts.tv_sec == -1)
1857 return -ENOENT;
1858 if (ts.tv_sec == 0) {
1859 sk->sk_stamp = ktime_get_real();
1860 ts = ktime_to_timespec(sk->sk_stamp);
1861 }
1862 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1863}
1864EXPORT_SYMBOL(sock_get_timestampns);
1865
20d49473 1866void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 1867{
20d49473
PO		 1868 if (!sock_flag(sk, flag)) {
1869 sock_set_flag(sk, flag);
1870 /*
1871 * we just set one of the two flags which require net
1872 * time stamping, but time stamping might have been on
1873 * already because of the other one
1874 */
1875 if (!sock_flag(sk,
1876 flag == SOCK_TIMESTAMP ?
1877 SOCK_TIMESTAMPING_RX_SOFTWARE :
1878 SOCK_TIMESTAMP))
1879 net_enable_timestamp();
1da177e4
LT		 1880 }
1881}
1da177e4
LT		 1882
1883/*
1884 * Get a socket option on an socket.
1885 *
1886 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1887 * asynchronous errors should be reported by getsockopt. We assume
1888 * this means if you specify SO_ERROR (otherwise whats the point of it).
1889 */
1890int sock_common_getsockopt(struct socket *sock, int level, int optname,
1891 char __user *optval, int __user *optlen)
1892{
1893 struct sock *sk = sock->sk;
1894
1895 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1896}
1897
1898EXPORT_SYMBOL(sock_common_getsockopt);
1899
3fdadf7d 1900#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1901int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1902 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1903{
1904 struct sock *sk = sock->sk;
1905
1e51f951 1906 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 1907 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1908 optval, optlen);
3fdadf7d
DM		 1909 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1910}
1911EXPORT_SYMBOL(compat_sock_common_getsockopt);
1912#endif
1913
1da177e4
LT		 1914int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1915 struct msghdr *msg, size_t size, int flags)
1916{
1917 struct sock *sk = sock->sk;
1918 int addr_len = 0;
1919 int err;
1920
1921 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1922 flags & ~MSG_DONTWAIT, &addr_len);
1923 if (err >= 0)
1924 msg->msg_namelen = addr_len;
1925 return err;
1926}
1927
1928EXPORT_SYMBOL(sock_common_recvmsg);
1929
1930/*
1931 * Set socket options on an inet socket.
1932 */
1933int sock_common_setsockopt(struct socket *sock, int level, int optname,
1934 char __user *optval, int optlen)
1935{
1936 struct sock *sk = sock->sk;
1937
1938 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1939}
1940
1941EXPORT_SYMBOL(sock_common_setsockopt);
1942
3fdadf7d 1943#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1944int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1945 char __user *optval, int optlen)
3fdadf7d
DM		 1946{
1947 struct sock *sk = sock->sk;
1948
543d9cfe
ACM		 1949 if (sk->sk_prot->compat_setsockopt != NULL)
1950 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1951 optval, optlen);
3fdadf7d
DM		 1952 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1953}
1954EXPORT_SYMBOL(compat_sock_common_setsockopt);
1955#endif
1956
1da177e4
LT		 1957void sk_common_release(struct sock *sk)
1958{
1959 if (sk->sk_prot->destroy)
1960 sk->sk_prot->destroy(sk);
1961
1962 /*
1963 * Observation: when sock_common_release is called, processes have
1964 * no access to socket. But net still has.
1965 * Step one, detach it from networking:
1966 *
1967 * A. Remove from hash tables.
1968 */
1969
1970 sk->sk_prot->unhash(sk);
1971
1972 /*
1973 * In this point socket cannot receive new packets, but it is possible
1974 * that some packets are in flight because some CPU runs receiver and
1975 * did hash table lookup before we unhashed socket. They will achieve
1976 * receive queue and will be purged by socket destructor.
1977 *
1978 * Also we still have packets pending on receive queue and probably,
1979 * our own packets waiting in device queues. sock_destroy will drain
1980 * receive queue, but transmitted packets will delay socket destruction
1981 * until the last reference will be released.
1982 */
1983
1984 sock_orphan(sk);
1985
1986 xfrm_sk_free_policy(sk);
1987
e6848976 1988 sk_refcnt_debug_release(sk);
1da177e4
LT		 1989 sock_put(sk);
1990}
1991
1992EXPORT_SYMBOL(sk_common_release);
1993
1994static DEFINE_RWLOCK(proto_list_lock);
1995static LIST_HEAD(proto_list);
1996
13ff3d6f
PE		 1997#ifdef CONFIG_PROC_FS
1998#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 1999struct prot_inuse {
2000 int val[PROTO_INUSE_NR];
2001};
13ff3d6f
PE		 2002
2003static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2004
2005#ifdef CONFIG_NET_NS
2006void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2007{
2008 int cpu = smp_processor_id();
2009 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
2010}
2011EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2012
2013int sock_prot_inuse_get(struct net *net, struct proto *prot)
2014{
2015 int cpu, idx = prot->inuse_idx;
2016 int res = 0;
2017
2018 for_each_possible_cpu(cpu)
2019 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2020
2021 return res >= 0 ? res : 0;
2022}
2023EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2024
2025static int sock_inuse_init_net(struct net *net)
2026{
2027 net->core.inuse = alloc_percpu(struct prot_inuse);
2028 return net->core.inuse ? 0 : -ENOMEM;
2029}
2030
2031static void sock_inuse_exit_net(struct net *net)
2032{
2033 free_percpu(net->core.inuse);
2034}
2035
2036static struct pernet_operations net_inuse_ops = {
2037 .init = sock_inuse_init_net,
2038 .exit = sock_inuse_exit_net,
2039};
2040
2041static __init int net_inuse_init(void)
2042{
2043 if (register_pernet_subsys(&net_inuse_ops))
2044 panic("Cannot initialize net inuse counters");
2045
2046 return 0;
2047}
2048
2049core_initcall(net_inuse_init);
2050#else
1338d466
PE		 2051static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2052
c29a0bc4 2053void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466
PE		 2054{
2055 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
2056}
2057EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2058
c29a0bc4 2059int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2060{
2061 int cpu, idx = prot->inuse_idx;
2062 int res = 0;
2063
2064 for_each_possible_cpu(cpu)
2065 res += per_cpu(prot_inuse, cpu).val[idx];
2066
2067 return res >= 0 ? res : 0;
2068}
2069EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2070#endif
13ff3d6f
PE		 2071
2072static void assign_proto_idx(struct proto *prot)
2073{
2074 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2075
2076 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2077 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2078 return;
2079 }
2080
2081 set_bit(prot->inuse_idx, proto_inuse_idx);
2082}
2083
2084static void release_proto_idx(struct proto *prot)
2085{
2086 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2087 clear_bit(prot->inuse_idx, proto_inuse_idx);
2088}
2089#else
2090static inline void assign_proto_idx(struct proto *prot)
2091{
2092}
2093
2094static inline void release_proto_idx(struct proto *prot)
2095{
2096}
2097#endif
2098
b733c007
PE		 2099int proto_register(struct proto *prot, int alloc_slab)
2100{
1da177e4
LT		 2101 if (alloc_slab) {
2102 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2103 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2104 NULL);
1da177e4
LT		 2105
2106 if (prot->slab == NULL) {
2107 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2108 prot->name);
60e7663d 2109 goto out;
1da177e4 2110 }
2e6599cb
ACM		 2111
2112 if (prot->rsk_prot != NULL) {
2113 static const char mask[] = "request_sock_%s";
2114
7e56b5d6
CM		 2115 prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2116 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2117 goto out_free_sock_slab;
2118
7e56b5d6
CM		 2119 sprintf(prot->rsk_prot->slab_name, mask, prot->name);
2120 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2121 prot->rsk_prot->obj_size, 0,
20c2df83 2122 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2123
2124 if (prot->rsk_prot->slab == NULL) {
2125 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2126 prot->name);
2127 goto out_free_request_sock_slab_name;
2128 }
2129 }
8feaf0c0 2130
6d6ee43e 2131 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 2132 static const char mask[] = "tw_sock_%s";
2133
7e56b5d6 2134 prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
8feaf0c0 2135
7e56b5d6 2136 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2137 goto out_free_request_sock_slab;
2138
7e56b5d6 2139 sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name);
6d6ee43e 2140 prot->twsk_prot->twsk_slab =
7e56b5d6 2141 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2142 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2143 0,
2144 SLAB_HWCACHE_ALIGN |
2145 prot->slab_flags,
20c2df83 2146 NULL);
6d6ee43e 2147 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2148 goto out_free_timewait_sock_slab_name;
2149 }
1da177e4
LT		 2150 }
2151
2a278051 2152 write_lock(&proto_list_lock);
1da177e4 2153 list_add(&prot->node, &proto_list);
13ff3d6f 2154 assign_proto_idx(prot);
1da177e4 2155 write_unlock(&proto_list_lock);
b733c007
PE		 2156 return 0;
2157
8feaf0c0 2158out_free_timewait_sock_slab_name:
7e56b5d6 2159 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2160out_free_request_sock_slab:
2161 if (prot->rsk_prot && prot->rsk_prot->slab) {
2162 kmem_cache_destroy(prot->rsk_prot->slab);
2163 prot->rsk_prot->slab = NULL;
2164 }
2e6599cb 2165out_free_request_sock_slab_name:
7e56b5d6 2166 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2167out_free_sock_slab:
2168 kmem_cache_destroy(prot->slab);
2169 prot->slab = NULL;
b733c007
PE		 2170out:
2171 return -ENOBUFS;
1da177e4
LT		 2172}
2173
2174EXPORT_SYMBOL(proto_register);
2175
2176void proto_unregister(struct proto *prot)
2177{
2178 write_lock(&proto_list_lock);
13ff3d6f 2179 release_proto_idx(prot);
0a3f4358
PM		 2180 list_del(&prot->node);
2181 write_unlock(&proto_list_lock);
1da177e4
LT		 2182
2183 if (prot->slab != NULL) {
2184 kmem_cache_destroy(prot->slab);
2185 prot->slab = NULL;
2186 }
2187
2e6599cb 2188 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2189 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2190 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2191 prot->rsk_prot->slab = NULL;
2192 }
2193
6d6ee43e 2194 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2195 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2196 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2197 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2198 }
1da177e4
LT		 2199}
2200
2201EXPORT_SYMBOL(proto_unregister);
2202
2203#ifdef CONFIG_PROC_FS
1da177e4 2204static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2205 __acquires(proto_list_lock)
1da177e4
LT		 2206{
2207 read_lock(&proto_list_lock);
60f0438a 2208 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2209}
2210
2211static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2212{
60f0438a 2213 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2214}
2215
2216static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2217 __releases(proto_list_lock)
1da177e4
LT		 2218{
2219 read_unlock(&proto_list_lock);
2220}
2221
2222static char proto_method_implemented(const void *method)
2223{
2224 return method == NULL ? 'n' : 'y';
2225}
2226
2227static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2228{
2229 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2230 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2231 proto->name,
2232 proto->obj_size,
14e943db 2233 sock_prot_inuse_get(seq_file_net(seq), proto),
1da177e4
LT		 2234 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2235 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2236 proto->max_header,
2237 proto->slab == NULL ? "no" : "yes",
2238 module_name(proto->owner),
2239 proto_method_implemented(proto->close),
2240 proto_method_implemented(proto->connect),
2241 proto_method_implemented(proto->disconnect),
2242 proto_method_implemented(proto->accept),
2243 proto_method_implemented(proto->ioctl),
2244 proto_method_implemented(proto->init),
2245 proto_method_implemented(proto->destroy),
2246 proto_method_implemented(proto->shutdown),
2247 proto_method_implemented(proto->setsockopt),
2248 proto_method_implemented(proto->getsockopt),
2249 proto_method_implemented(proto->sendmsg),
2250 proto_method_implemented(proto->recvmsg),
2251 proto_method_implemented(proto->sendpage),
2252 proto_method_implemented(proto->bind),
2253 proto_method_implemented(proto->backlog_rcv),
2254 proto_method_implemented(proto->hash),
2255 proto_method_implemented(proto->unhash),
2256 proto_method_implemented(proto->get_port),
2257 proto_method_implemented(proto->enter_memory_pressure));
2258}
2259
2260static int proto_seq_show(struct seq_file *seq, void *v)
2261{
60f0438a 2262 if (v == &proto_list)
1da177e4
LT		 2263 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2264 "protocol",
2265 "size",
2266 "sockets",
2267 "memory",
2268 "press",
2269 "maxhdr",
2270 "slab",
2271 "module",
2272 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2273 else
60f0438a 2274 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2275 return 0;
2276}
2277
f690808e 2278static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2279 .start = proto_seq_start,
2280 .next = proto_seq_next,
2281 .stop = proto_seq_stop,
2282 .show = proto_seq_show,
2283};
2284
2285static int proto_seq_open(struct inode *inode, struct file *file)
2286{
14e943db
ED		 2287 return seq_open_net(inode, file, &proto_seq_ops,
2288 sizeof(struct seq_net_private));
1da177e4
LT		 2289}
2290
9a32144e 2291static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2292 .owner = THIS_MODULE,
2293 .open = proto_seq_open,
2294 .read = seq_read,
2295 .llseek = seq_lseek,
14e943db
ED		 2296 .release = seq_release_net,
2297};
2298
2299static __net_init int proto_init_net(struct net *net)
2300{
2301 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2302 return -ENOMEM;
2303
2304 return 0;
2305}
2306
2307static __net_exit void proto_exit_net(struct net *net)
2308{
2309 proc_net_remove(net, "protocols");
2310}
2311
2312
2313static __net_initdata struct pernet_operations proto_net_ops = {
2314 .init = proto_init_net,
2315 .exit = proto_exit_net,
1da177e4
LT		 2316};
2317
2318static int __init proto_init(void)
2319{
14e943db 2320 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2321}
2322
2323subsys_initcall(proto_init);
2324
2325#endif /* PROC_FS */
2326
2327EXPORT_SYMBOL(sk_alloc);
2328EXPORT_SYMBOL(sk_free);
2329EXPORT_SYMBOL(sk_send_sigurg);
2330EXPORT_SYMBOL(sock_alloc_send_skb);
2331EXPORT_SYMBOL(sock_init_data);
2332EXPORT_SYMBOL(sock_kfree_s);
2333EXPORT_SYMBOL(sock_kmalloc);
2334EXPORT_SYMBOL(sock_no_accept);
2335EXPORT_SYMBOL(sock_no_bind);
2336EXPORT_SYMBOL(sock_no_connect);
2337EXPORT_SYMBOL(sock_no_getname);
2338EXPORT_SYMBOL(sock_no_getsockopt);
2339EXPORT_SYMBOL(sock_no_ioctl);
2340EXPORT_SYMBOL(sock_no_listen);
2341EXPORT_SYMBOL(sock_no_mmap);
2342EXPORT_SYMBOL(sock_no_poll);
2343EXPORT_SYMBOL(sock_no_recvmsg);
2344EXPORT_SYMBOL(sock_no_sendmsg);
2345EXPORT_SYMBOL(sock_no_sendpage);
2346EXPORT_SYMBOL(sock_no_setsockopt);
2347EXPORT_SYMBOL(sock_no_shutdown);
2348EXPORT_SYMBOL(sock_no_socketpair);
2349EXPORT_SYMBOL(sock_rfree);
2350EXPORT_SYMBOL(sock_setsockopt);
2351EXPORT_SYMBOL(sock_wfree);
2352EXPORT_SYMBOL(sock_wmalloc);
2353EXPORT_SYMBOL(sock_i_uid);
2354EXPORT_SYMBOL(sock_i_ino);
1da177e4 2355EXPORT_SYMBOL(sysctl_optmem_max);