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net: implement a SO_PROTOCOL getsockoption
[mirror_ubuntu-hirsute-kernel.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 */
36cbd3dc 145static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 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" ,
cbd151bf 153 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 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 157 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
fcb94e42 158 "sk_lock-AF_IEEE802154",
bce7b154 159 "sk_lock-AF_MAX"
a5b5bb9a 160};
36cbd3dc 161static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 162 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
163 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
164 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
165 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
166 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
167 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
168 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 169 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 170 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 171 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 172 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 173 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
fcb94e42 174 "slock-AF_IEEE802154",
bce7b154 175 "slock-AF_MAX"
a5b5bb9a 176};
36cbd3dc 177static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 178 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
179 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
180 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
181 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
182 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
183 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
184 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 185 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 186 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 187 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 188 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 189 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
fcb94e42 190 "clock-AF_IEEE802154",
bce7b154 191 "clock-AF_MAX"
443aef0e 192};
da21f24d
IM		 193
194/*
195 * sk_callback_lock locking rules are per-address-family,
196 * so split the lock classes by using a per-AF key:
197 */
198static struct lock_class_key af_callback_keys[AF_MAX];
199
1da177e4
LT		 200/* Take into consideration the size of the struct sk_buff overhead in the
201 * determination of these values, since that is non-constant across
202 * platforms. This makes socket queueing behavior and performance
203 * not depend upon such differences.
204 */
205#define _SK_MEM_PACKETS 256
206#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
207#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
208#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
209
210/* Run time adjustable parameters. */
ab32ea5d
BH		 211__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
212__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
213__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
214__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4
LT		 215
216/* Maximal space eaten by iovec or ancilliary data plus some space */
ab32ea5d 217int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 218EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4
LT		 219
220static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
221{
222 struct timeval tv;
223
224 if (optlen < sizeof(tv))
225 return -EINVAL;
226 if (copy_from_user(&tv, optval, sizeof(tv)))
227 return -EFAULT;
ba78073e
VA		 228 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
229 return -EDOM;
1da177e4 230
ba78073e 231 if (tv.tv_sec < 0) {
6f11df83
AM		 232 static int warned __read_mostly;
233
ba78073e 234 *timeo_p = 0;
50aab54f 235 if (warned < 10 && net_ratelimit()) {
ba78073e
VA		 236 warned++;
237 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
238 "tries to set negative timeout\n",
ba25f9dc 239 current->comm, task_pid_nr(current));
50aab54f 240 }
ba78073e
VA		 241 return 0;
242 }
1da177e4
LT		 243 *timeo_p = MAX_SCHEDULE_TIMEOUT;
244 if (tv.tv_sec == 0 && tv.tv_usec == 0)
245 return 0;
246 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
247 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
248 return 0;
249}
250
251static void sock_warn_obsolete_bsdism(const char *name)
252{
253 static int warned;
254 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 255 if (strcmp(warncomm, current->comm) && warned < 5) {
256 strcpy(warncomm, current->comm);
1da177e4
LT		 257 printk(KERN_WARNING "process `%s' is using obsolete "
258 "%s SO_BSDCOMPAT\n", warncomm, name);
259 warned++;
260 }
261}
262
20d49473 263static void sock_disable_timestamp(struct sock *sk, int flag)
4ec93edb 264{
20d49473
PO		 265 if (sock_flag(sk, flag)) {
266 sock_reset_flag(sk, flag);
267 if (!sock_flag(sk, SOCK_TIMESTAMP) &&
268 !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) {
269 net_disable_timestamp();
270 }
1da177e4
LT		 271 }
272}
273
274
f0088a50
DV		 275int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
276{
277 int err = 0;
278 int skb_len;
279
9ee6b7f1 280 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
f0088a50
DV		 281 number of warnings when compiling with -W --ANK
282 */
283 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
284 (unsigned)sk->sk_rcvbuf) {
285 err = -ENOMEM;
286 goto out;
287 }
288
fda9ef5d 289 err = sk_filter(sk, skb);
f0088a50
DV		 290 if (err)
291 goto out;
292
3ab224be
HA		 293 if (!sk_rmem_schedule(sk, skb->truesize)) {
294 err = -ENOBUFS;
295 goto out;
296 }
297
f0088a50
DV		 298 skb->dev = NULL;
299 skb_set_owner_r(skb, sk);
49ad9599 300
f0088a50
DV		 301 /* Cache the SKB length before we tack it onto the receive
302 * queue. Once it is added it no longer belongs to us and
303 * may be freed by other threads of control pulling packets
304 * from the queue.
305 */
306 skb_len = skb->len;
307
308 skb_queue_tail(&sk->sk_receive_queue, skb);
309
310 if (!sock_flag(sk, SOCK_DEAD))
311 sk->sk_data_ready(sk, skb_len);
312out:
313 return err;
314}
315EXPORT_SYMBOL(sock_queue_rcv_skb);
316
58a5a7b9 317int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 318{
319 int rc = NET_RX_SUCCESS;
320
fda9ef5d 321 if (sk_filter(sk, skb))
f0088a50
DV		 322 goto discard_and_relse;
323
324 skb->dev = NULL;
325
58a5a7b9
ACM		 326 if (nested)
327 bh_lock_sock_nested(sk);
328 else
329 bh_lock_sock(sk);
a5b5bb9a
IM		 330 if (!sock_owned_by_user(sk)) {
331 /*
332 * trylock + unlock semantics:
333 */
334 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
335
c57943a1 336 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 337
338 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
339 } else
f0088a50
DV		 340 sk_add_backlog(sk, skb);
341 bh_unlock_sock(sk);
342out:
343 sock_put(sk);
344 return rc;
345discard_and_relse:
346 kfree_skb(skb);
347 goto out;
348}
349EXPORT_SYMBOL(sk_receive_skb);
350
351struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
352{
353 struct dst_entry *dst = sk->sk_dst_cache;
354
355 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
356 sk->sk_dst_cache = NULL;
357 dst_release(dst);
358 return NULL;
359 }
360
361 return dst;
362}
363EXPORT_SYMBOL(__sk_dst_check);
364
365struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
366{
367 struct dst_entry *dst = sk_dst_get(sk);
368
369 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
370 sk_dst_reset(sk);
371 dst_release(dst);
372 return NULL;
373 }
374
375 return dst;
376}
377EXPORT_SYMBOL(sk_dst_check);
378
4878809f
DM		 379static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
380{
381 int ret = -ENOPROTOOPT;
382#ifdef CONFIG_NETDEVICES
3b1e0a65 383 struct net *net = sock_net(sk);
4878809f
DM		 384 char devname[IFNAMSIZ];
385 int index;
386
387 /* Sorry... */
388 ret = -EPERM;
389 if (!capable(CAP_NET_RAW))
390 goto out;
391
392 ret = -EINVAL;
393 if (optlen < 0)
394 goto out;
395
396 /* Bind this socket to a particular device like "eth0",
397 * as specified in the passed interface name. If the
398 * name is "" or the option length is zero the socket
399 * is not bound.
400 */
401 if (optlen > IFNAMSIZ - 1)
402 optlen = IFNAMSIZ - 1;
403 memset(devname, 0, sizeof(devname));
404
405 ret = -EFAULT;
406 if (copy_from_user(devname, optval, optlen))
407 goto out;
408
409 if (devname[0] == '\0') {
410 index = 0;
411 } else {
881d966b 412 struct net_device *dev = dev_get_by_name(net, devname);
4878809f
DM		 413
414 ret = -ENODEV;
415 if (!dev)
416 goto out;
417
418 index = dev->ifindex;
419 dev_put(dev);
420 }
421
422 lock_sock(sk);
423 sk->sk_bound_dev_if = index;
424 sk_dst_reset(sk);
425 release_sock(sk);
426
427 ret = 0;
428
429out:
430#endif
431
432 return ret;
433}
434
c0ef877b
PE		 435static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
436{
437 if (valbool)
438 sock_set_flag(sk, bit);
439 else
440 sock_reset_flag(sk, bit);
441}
442
1da177e4
LT		 443/*
444 * This is meant for all protocols to use and covers goings on
445 * at the socket level. Everything here is generic.
446 */
447
448int sock_setsockopt(struct socket *sock, int level, int optname,
449 char __user *optval, int optlen)
450{
2a91525c 451 struct sock *sk = sock->sk;
1da177e4
LT		 452 int val;
453 int valbool;
454 struct linger ling;
455 int ret = 0;
4ec93edb 456
1da177e4
LT		 457 /*
458 * Options without arguments
459 */
460
4878809f
DM		 461 if (optname == SO_BINDTODEVICE)
462 return sock_bindtodevice(sk, optval, optlen);
463
e71a4783
SH		 464 if (optlen < sizeof(int))
465 return -EINVAL;
4ec93edb 466
1da177e4
LT		 467 if (get_user(val, (int __user *)optval))
468 return -EFAULT;
4ec93edb 469
2a91525c 470 valbool = val ? 1 : 0;
1da177e4
LT		 471
472 lock_sock(sk);
473
2a91525c 474 switch (optname) {
e71a4783 475 case SO_DEBUG:
2a91525c 476 if (val && !capable(CAP_NET_ADMIN))
e71a4783 477 ret = -EACCES;
2a91525c 478 else
c0ef877b 479 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 480 break;
481 case SO_REUSEADDR:
482 sk->sk_reuse = valbool;
483 break;
484 case SO_TYPE:
49c794e9 485 case SO_PROTOCOL:
e71a4783
SH		 486 case SO_ERROR:
487 ret = -ENOPROTOOPT;
488 break;
489 case SO_DONTROUTE:
c0ef877b 490 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 491 break;
492 case SO_BROADCAST:
493 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
494 break;
495 case SO_SNDBUF:
496 /* Don't error on this BSD doesn't and if you think
497 about it this is right. Otherwise apps have to
498 play 'guess the biggest size' games. RCVBUF/SNDBUF
499 are treated in BSD as hints */
500
501 if (val > sysctl_wmem_max)
502 val = sysctl_wmem_max;
b0573dea 503set_sndbuf:
e71a4783
SH		 504 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
505 if ((val * 2) < SOCK_MIN_SNDBUF)
506 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
507 else
508 sk->sk_sndbuf = val * 2;
1da177e4 509
e71a4783
SH		 510 /*
511 * Wake up sending tasks if we
512 * upped the value.
513 */
514 sk->sk_write_space(sk);
515 break;
1da177e4 516
e71a4783
SH		 517 case SO_SNDBUFFORCE:
518 if (!capable(CAP_NET_ADMIN)) {
519 ret = -EPERM;
520 break;
521 }
522 goto set_sndbuf;
b0573dea 523
e71a4783
SH		 524 case SO_RCVBUF:
525 /* Don't error on this BSD doesn't and if you think
526 about it this is right. Otherwise apps have to
527 play 'guess the biggest size' games. RCVBUF/SNDBUF
528 are treated in BSD as hints */
4ec93edb 529
e71a4783
SH		 530 if (val > sysctl_rmem_max)
531 val = sysctl_rmem_max;
b0573dea 532set_rcvbuf:
e71a4783
SH		 533 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
534 /*
535 * We double it on the way in to account for
536 * "struct sk_buff" etc. overhead. Applications
537 * assume that the SO_RCVBUF setting they make will
538 * allow that much actual data to be received on that
539 * socket.
540 *
541 * Applications are unaware that "struct sk_buff" and
542 * other overheads allocate from the receive buffer
543 * during socket buffer allocation.
544 *
545 * And after considering the possible alternatives,
546 * returning the value we actually used in getsockopt
547 * is the most desirable behavior.
548 */
549 if ((val * 2) < SOCK_MIN_RCVBUF)
550 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
551 else
552 sk->sk_rcvbuf = val * 2;
553 break;
554
555 case SO_RCVBUFFORCE:
556 if (!capable(CAP_NET_ADMIN)) {
557 ret = -EPERM;
1da177e4 558 break;
e71a4783
SH		 559 }
560 goto set_rcvbuf;
1da177e4 561
e71a4783 562 case SO_KEEPALIVE:
1da177e4 563#ifdef CONFIG_INET
e71a4783
SH		 564 if (sk->sk_protocol == IPPROTO_TCP)
565 tcp_set_keepalive(sk, valbool);
1da177e4 566#endif
e71a4783
SH		 567 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
568 break;
569
570 case SO_OOBINLINE:
571 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
572 break;
573
574 case SO_NO_CHECK:
575 sk->sk_no_check = valbool;
576 break;
577
578 case SO_PRIORITY:
579 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
580 sk->sk_priority = val;
581 else
582 ret = -EPERM;
583 break;
584
585 case SO_LINGER:
586 if (optlen < sizeof(ling)) {
587 ret = -EINVAL; /* 1003.1g */
1da177e4 588 break;
e71a4783 589 }
2a91525c 590 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 591 ret = -EFAULT;
1da177e4 592 break;
e71a4783
SH		 593 }
594 if (!ling.l_onoff)
595 sock_reset_flag(sk, SOCK_LINGER);
596 else {
1da177e4 597#if (BITS_PER_LONG == 32)
e71a4783
SH		 598 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
599 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 600 else
e71a4783
SH		 601#endif
602 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
603 sock_set_flag(sk, SOCK_LINGER);
604 }
605 break;
606
607 case SO_BSDCOMPAT:
608 sock_warn_obsolete_bsdism("setsockopt");
609 break;
610
611 case SO_PASSCRED:
612 if (valbool)
613 set_bit(SOCK_PASSCRED, &sock->flags);
614 else
615 clear_bit(SOCK_PASSCRED, &sock->flags);
616 break;
617
618 case SO_TIMESTAMP:
92f37fd2 619 case SO_TIMESTAMPNS:
e71a4783 620 if (valbool) {
92f37fd2
ED		 621 if (optname == SO_TIMESTAMP)
622 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
623 else
624 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 625 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 626 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 627 } else {
e71a4783 628 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 629 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
630 }
e71a4783
SH		 631 break;
632
20d49473
PO		 633 case SO_TIMESTAMPING:
634 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 635 ret = -EINVAL;
20d49473
PO		 636 break;
637 }
638 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
639 val & SOF_TIMESTAMPING_TX_HARDWARE);
640 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
641 val & SOF_TIMESTAMPING_TX_SOFTWARE);
642 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
643 val & SOF_TIMESTAMPING_RX_HARDWARE);
644 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
645 sock_enable_timestamp(sk,
646 SOCK_TIMESTAMPING_RX_SOFTWARE);
647 else
648 sock_disable_timestamp(sk,
649 SOCK_TIMESTAMPING_RX_SOFTWARE);
650 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
651 val & SOF_TIMESTAMPING_SOFTWARE);
652 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
653 val & SOF_TIMESTAMPING_SYS_HARDWARE);
654 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
655 val & SOF_TIMESTAMPING_RAW_HARDWARE);
656 break;
657
e71a4783
SH		 658 case SO_RCVLOWAT:
659 if (val < 0)
660 val = INT_MAX;
661 sk->sk_rcvlowat = val ? : 1;
662 break;
663
664 case SO_RCVTIMEO:
665 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
666 break;
667
668 case SO_SNDTIMEO:
669 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
670 break;
1da177e4 671
e71a4783
SH		 672 case SO_ATTACH_FILTER:
673 ret = -EINVAL;
674 if (optlen == sizeof(struct sock_fprog)) {
675 struct sock_fprog fprog;
1da177e4 676
e71a4783
SH		 677 ret = -EFAULT;
678 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 679 break;
e71a4783
SH		 680
681 ret = sk_attach_filter(&fprog, sk);
682 }
683 break;
684
685 case SO_DETACH_FILTER:
55b33325 686 ret = sk_detach_filter(sk);
e71a4783 687 break;
1da177e4 688
e71a4783
SH		 689 case SO_PASSSEC:
690 if (valbool)
691 set_bit(SOCK_PASSSEC, &sock->flags);
692 else
693 clear_bit(SOCK_PASSSEC, &sock->flags);
694 break;
4a19ec58
LAT		 695 case SO_MARK:
696 if (!capable(CAP_NET_ADMIN))
697 ret = -EPERM;
2a91525c 698 else
4a19ec58 699 sk->sk_mark = val;
4a19ec58 700 break;
877ce7c1 701
1da177e4
LT		 702 /* We implement the SO_SNDLOWAT etc to
703 not be settable (1003.1g 5.3) */
e71a4783
SH		 704 default:
705 ret = -ENOPROTOOPT;
706 break;
4ec93edb 707 }
1da177e4
LT		 708 release_sock(sk);
709 return ret;
710}
2a91525c 711EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 712
713
714int sock_getsockopt(struct socket *sock, int level, int optname,
715 char __user *optval, int __user *optlen)
716{
717 struct sock *sk = sock->sk;
4ec93edb 718
e71a4783 719 union {
4ec93edb
YH		 720 int val;
721 struct linger ling;
1da177e4
LT		 722 struct timeval tm;
723 } v;
4ec93edb 724
1da177e4
LT		 725 unsigned int lv = sizeof(int);
726 int len;
4ec93edb 727
e71a4783 728 if (get_user(len, optlen))
4ec93edb 729 return -EFAULT;
e71a4783 730 if (len < 0)
1da177e4 731 return -EINVAL;
4ec93edb 732
50fee1de 733 memset(&v, 0, sizeof(v));
df0bca04 734
2a91525c 735 switch (optname) {
e71a4783
SH		 736 case SO_DEBUG:
737 v.val = sock_flag(sk, SOCK_DBG);
738 break;
739
740 case SO_DONTROUTE:
741 v.val = sock_flag(sk, SOCK_LOCALROUTE);
742 break;
743
744 case SO_BROADCAST:
745 v.val = !!sock_flag(sk, SOCK_BROADCAST);
746 break;
747
748 case SO_SNDBUF:
749 v.val = sk->sk_sndbuf;
750 break;
751
752 case SO_RCVBUF:
753 v.val = sk->sk_rcvbuf;
754 break;
755
756 case SO_REUSEADDR:
757 v.val = sk->sk_reuse;
758 break;
759
760 case SO_KEEPALIVE:
761 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
762 break;
763
764 case SO_TYPE:
765 v.val = sk->sk_type;
766 break;
767
49c794e9
JE		 768 case SO_PROTOCOL:
769 v.val = sk->sk_protocol;
770 break;
771
e71a4783
SH		 772 case SO_ERROR:
773 v.val = -sock_error(sk);
2a91525c 774 if (v.val == 0)
e71a4783
SH		 775 v.val = xchg(&sk->sk_err_soft, 0);
776 break;
777
778 case SO_OOBINLINE:
779 v.val = !!sock_flag(sk, SOCK_URGINLINE);
780 break;
781
782 case SO_NO_CHECK:
783 v.val = sk->sk_no_check;
784 break;
785
786 case SO_PRIORITY:
787 v.val = sk->sk_priority;
788 break;
789
790 case SO_LINGER:
791 lv = sizeof(v.ling);
792 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
793 v.ling.l_linger = sk->sk_lingertime / HZ;
794 break;
795
796 case SO_BSDCOMPAT:
797 sock_warn_obsolete_bsdism("getsockopt");
798 break;
799
800 case SO_TIMESTAMP:
92f37fd2
ED		 801 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
802 !sock_flag(sk, SOCK_RCVTSTAMPNS);
803 break;
804
805 case SO_TIMESTAMPNS:
806 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 807 break;
808
20d49473
PO		 809 case SO_TIMESTAMPING:
810 v.val = 0;
811 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
812 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
813 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
814 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
815 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
816 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
817 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
818 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
819 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
820 v.val |= SOF_TIMESTAMPING_SOFTWARE;
821 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
822 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
823 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
824 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
825 break;
826
e71a4783 827 case SO_RCVTIMEO:
2a91525c 828 lv = sizeof(struct timeval);
e71a4783
SH		 829 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
830 v.tm.tv_sec = 0;
831 v.tm.tv_usec = 0;
832 } else {
833 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
834 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
835 }
836 break;
837
838 case SO_SNDTIMEO:
2a91525c 839 lv = sizeof(struct timeval);
e71a4783
SH		 840 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
841 v.tm.tv_sec = 0;
842 v.tm.tv_usec = 0;
843 } else {
844 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
845 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
846 }
847 break;
1da177e4 848
e71a4783
SH		 849 case SO_RCVLOWAT:
850 v.val = sk->sk_rcvlowat;
851 break;
1da177e4 852
e71a4783 853 case SO_SNDLOWAT:
2a91525c 854 v.val = 1;
e71a4783 855 break;
1da177e4 856
e71a4783
SH		 857 case SO_PASSCRED:
858 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
859 break;
1da177e4 860
e71a4783
SH		 861 case SO_PEERCRED:
862 if (len > sizeof(sk->sk_peercred))
863 len = sizeof(sk->sk_peercred);
864 if (copy_to_user(optval, &sk->sk_peercred, len))
865 return -EFAULT;
866 goto lenout;
1da177e4 867
e71a4783
SH		 868 case SO_PEERNAME:
869 {
870 char address[128];
871
872 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
873 return -ENOTCONN;
874 if (lv < len)
875 return -EINVAL;
876 if (copy_to_user(optval, address, len))
877 return -EFAULT;
878 goto lenout;
879 }
1da177e4 880
e71a4783
SH		 881 /* Dubious BSD thing... Probably nobody even uses it, but
882 * the UNIX standard wants it for whatever reason... -DaveM
883 */
884 case SO_ACCEPTCONN:
885 v.val = sk->sk_state == TCP_LISTEN;
886 break;
1da177e4 887
e71a4783
SH		 888 case SO_PASSSEC:
889 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
890 break;
877ce7c1 891
e71a4783
SH		 892 case SO_PEERSEC:
893 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 894
4a19ec58
LAT		 895 case SO_MARK:
896 v.val = sk->sk_mark;
897 break;
898
e71a4783
SH		 899 default:
900 return -ENOPROTOOPT;
1da177e4 901 }
e71a4783 902
1da177e4
LT		 903 if (len > lv)
904 len = lv;
905 if (copy_to_user(optval, &v, len))
906 return -EFAULT;
907lenout:
4ec93edb
YH		 908 if (put_user(len, optlen))
909 return -EFAULT;
910 return 0;
1da177e4
LT		 911}
912
a5b5bb9a
IM		 913/*
914 * Initialize an sk_lock.
915 *
916 * (We also register the sk_lock with the lock validator.)
917 */
b6f99a21 918static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 919{
ed07536e
PZ		 920 sock_lock_init_class_and_name(sk,
921 af_family_slock_key_strings[sk->sk_family],
922 af_family_slock_keys + sk->sk_family,
923 af_family_key_strings[sk->sk_family],
924 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 925}
926
4dc6dc71
ED		 927/*
928 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
929 * even temporarly, because of RCU lookups. sk_node should also be left as is.
930 */
f1a6c4da
PE		 931static void sock_copy(struct sock *nsk, const struct sock *osk)
932{
933#ifdef CONFIG_SECURITY_NETWORK
934 void *sptr = nsk->sk_security;
935#endif
4dc6dc71
ED		 936 BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) !=
937 sizeof(osk->sk_node) + sizeof(osk->sk_refcnt));
938 memcpy(&nsk->sk_copy_start, &osk->sk_copy_start,
939 osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start));
f1a6c4da
PE		 940#ifdef CONFIG_SECURITY_NETWORK
941 nsk->sk_security = sptr;
942 security_sk_clone(osk, nsk);
943#endif
944}
945
2e4afe7b
PE		 946static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
947 int family)
c308c1b2
PE		 948{
949 struct sock *sk;
950 struct kmem_cache *slab;
951
952 slab = prot->slab;
e912b114
ED		 953 if (slab != NULL) {
954 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
955 if (!sk)
956 return sk;
957 if (priority & __GFP_ZERO) {
958 /*
959 * caches using SLAB_DESTROY_BY_RCU should let
960 * sk_node.next un-modified. Special care is taken
961 * when initializing object to zero.
962 */
963 if (offsetof(struct sock, sk_node.next) != 0)
964 memset(sk, 0, offsetof(struct sock, sk_node.next));
965 memset(&sk->sk_node.pprev, 0,
966 prot->obj_size - offsetof(struct sock,
967 sk_node.pprev));
968 }
969 }
c308c1b2
PE		 970 else
971 sk = kmalloc(prot->obj_size, priority);
972
2e4afe7b 973 if (sk != NULL) {
a98b65a3
VN		 974 kmemcheck_annotate_bitfield(sk, flags);
975
2e4afe7b
PE		 976 if (security_sk_alloc(sk, family, priority))
977 goto out_free;
978
979 if (!try_module_get(prot->owner))
980 goto out_free_sec;
981 }
982
c308c1b2 983 return sk;
2e4afe7b
PE		 984
985out_free_sec:
986 security_sk_free(sk);
987out_free:
988 if (slab != NULL)
989 kmem_cache_free(slab, sk);
990 else
991 kfree(sk);
992 return NULL;
c308c1b2
PE		 993}
994
995static void sk_prot_free(struct proto *prot, struct sock *sk)
996{
997 struct kmem_cache *slab;
2e4afe7b 998 struct module *owner;
c308c1b2 999
2e4afe7b 1000 owner = prot->owner;
c308c1b2 1001 slab = prot->slab;
2e4afe7b
PE		 1002
1003 security_sk_free(sk);
c308c1b2
PE		 1004 if (slab != NULL)
1005 kmem_cache_free(slab, sk);
1006 else
1007 kfree(sk);
2e4afe7b 1008 module_put(owner);
c308c1b2
PE		 1009}
1010
1da177e4
LT		 1011/**
1012 * sk_alloc - All socket objects are allocated here
c4ea43c5 1013 * @net: the applicable net namespace
4dc3b16b
PP		 1014 * @family: protocol family
1015 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1016 * @prot: struct proto associated with this new sock instance
1da177e4 1017 */
1b8d7ae4 1018struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1019 struct proto *prot)
1da177e4 1020{
c308c1b2 1021 struct sock *sk;
1da177e4 1022
154adbc8 1023 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1024 if (sk) {
154adbc8
PE		 1025 sk->sk_family = family;
1026 /*
1027 * See comment in struct sock definition to understand
1028 * why we need sk_prot_creator -acme
1029 */
1030 sk->sk_prot = sk->sk_prot_creator = prot;
1031 sock_lock_init(sk);
3b1e0a65 1032 sock_net_set(sk, get_net(net));
1da177e4 1033 }
a79af59e 1034
2e4afe7b 1035 return sk;
1da177e4 1036}
2a91525c 1037EXPORT_SYMBOL(sk_alloc);
1da177e4 1038
2b85a34e 1039static void __sk_free(struct sock *sk)
1da177e4
LT		 1040{
1041 struct sk_filter *filter;
1da177e4
LT		 1042
1043 if (sk->sk_destruct)
1044 sk->sk_destruct(sk);
1045
fda9ef5d 1046 filter = rcu_dereference(sk->sk_filter);
1da177e4 1047 if (filter) {
309dd5fc 1048 sk_filter_uncharge(sk, filter);
fda9ef5d 1049 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 1050 }
1051
20d49473
PO		 1052 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1053 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1da177e4
LT		 1054
1055 if (atomic_read(&sk->sk_omem_alloc))
1056 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 1057 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1058
3b1e0a65 1059 put_net(sock_net(sk));
c308c1b2 1060 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1061}
2b85a34e
ED		 1062
1063void sk_free(struct sock *sk)
1064{
1065 /*
1066 * We substract one from sk_wmem_alloc and can know if
1067 * some packets are still in some tx queue.
1068 * If not null, sock_wfree() will call __sk_free(sk) later
1069 */
1070 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1071 __sk_free(sk);
1072}
2a91525c 1073EXPORT_SYMBOL(sk_free);
1da177e4 1074
edf02087
DL		 1075/*
1076 * Last sock_put should drop referrence to sk->sk_net. It has already
1077 * been dropped in sk_change_net. Taking referrence to stopping namespace
1078 * is not an option.
1079 * Take referrence to a socket to remove it from hash _alive_ and after that
1080 * destroy it in the context of init_net.
1081 */
1082void sk_release_kernel(struct sock *sk)
1083{
1084 if (sk == NULL || sk->sk_socket == NULL)
1085 return;
1086
1087 sock_hold(sk);
1088 sock_release(sk->sk_socket);
65a18ec5 1089 release_net(sock_net(sk));
3b1e0a65 1090 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1091 sock_put(sk);
1092}
45af1754 1093EXPORT_SYMBOL(sk_release_kernel);
edf02087 1094
dd0fc66f 1095struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1096{
8fd1d178 1097 struct sock *newsk;
87d11ceb 1098
8fd1d178 1099 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1100 if (newsk != NULL) {
1101 struct sk_filter *filter;
1102
892c141e 1103 sock_copy(newsk, sk);
87d11ceb
ACM		 1104
1105 /* SANITY */
3b1e0a65 1106 get_net(sock_net(newsk));
87d11ceb
ACM		 1107 sk_node_init(&newsk->sk_node);
1108 sock_lock_init(newsk);
1109 bh_lock_sock(newsk);
fa438ccf 1110 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
87d11ceb
ACM		 1111
1112 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1113 /*
1114 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1115 */
1116 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1117 atomic_set(&newsk->sk_omem_alloc, 0);
1118 skb_queue_head_init(&newsk->sk_receive_queue);
1119 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1120#ifdef CONFIG_NET_DMA
1121 skb_queue_head_init(&newsk->sk_async_wait_queue);
1122#endif
87d11ceb
ACM		 1123
1124 rwlock_init(&newsk->sk_dst_lock);
1125 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1126 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1127 af_callback_keys + newsk->sk_family,
1128 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1129
1130 newsk->sk_dst_cache = NULL;
1131 newsk->sk_wmem_queued = 0;
1132 newsk->sk_forward_alloc = 0;
1133 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1134 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1135
1136 sock_reset_flag(newsk, SOCK_DONE);
1137 skb_queue_head_init(&newsk->sk_error_queue);
1138
1139 filter = newsk->sk_filter;
1140 if (filter != NULL)
1141 sk_filter_charge(newsk, filter);
1142
1143 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1144 /* It is still raw copy of parent, so invalidate
1145 * destructor and make plain sk_free() */
1146 newsk->sk_destruct = NULL;
1147 sk_free(newsk);
1148 newsk = NULL;
1149 goto out;
1150 }
1151
1152 newsk->sk_err = 0;
1153 newsk->sk_priority = 0;
4dc6dc71
ED		 1154 /*
1155 * Before updating sk_refcnt, we must commit prior changes to memory
1156 * (Documentation/RCU/rculist_nulls.txt for details)
1157 */
1158 smp_wmb();
87d11ceb
ACM		 1159 atomic_set(&newsk->sk_refcnt, 2);
1160
1161 /*
1162 * Increment the counter in the same struct proto as the master
1163 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1164 * is the same as sk->sk_prot->socks, as this field was copied
1165 * with memcpy).
1166 *
1167 * This _changes_ the previous behaviour, where
1168 * tcp_create_openreq_child always was incrementing the
1169 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1170 * to be taken into account in all callers. -acme
1171 */
1172 sk_refcnt_debug_inc(newsk);
972692e0 1173 sk_set_socket(newsk, NULL);
87d11ceb
ACM		 1174 newsk->sk_sleep = NULL;
1175
1176 if (newsk->sk_prot->sockets_allocated)
1748376b 1177 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
87d11ceb
ACM		 1178 }
1179out:
1180 return newsk;
1181}
87d11ceb
ACM		 1182EXPORT_SYMBOL_GPL(sk_clone);
1183
9958089a
AK		 1184void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1185{
1186 __sk_dst_set(sk, dst);
1187 sk->sk_route_caps = dst->dev->features;
1188 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1189 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
9958089a 1190 if (sk_can_gso(sk)) {
82cc1a7a 1191 if (dst->header_len) {
9958089a 1192 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1193 } else {
9958089a 1194 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1195 sk->sk_gso_max_size = dst->dev->gso_max_size;
1196 }
9958089a
AK		 1197 }
1198}
1199EXPORT_SYMBOL_GPL(sk_setup_caps);
1200
1da177e4
LT		 1201void __init sk_init(void)
1202{
1203 if (num_physpages <= 4096) {
1204 sysctl_wmem_max = 32767;
1205 sysctl_rmem_max = 32767;
1206 sysctl_wmem_default = 32767;
1207 sysctl_rmem_default = 32767;
1208 } else if (num_physpages >= 131072) {
1209 sysctl_wmem_max = 131071;
1210 sysctl_rmem_max = 131071;
1211 }
1212}
1213
1214/*
1215 * Simple resource managers for sockets.
1216 */
1217
1218
4ec93edb
YH		 1219/*
1220 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1221 */
1222void sock_wfree(struct sk_buff *skb)
1223{
1224 struct sock *sk = skb->sk;
2b85a34e 1225 int res;
1da177e4
LT		 1226
1227 /* In case it might be waiting for more memory. */
2b85a34e 1228 res = atomic_sub_return(skb->truesize, &sk->sk_wmem_alloc);
1da177e4
LT		 1229 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1230 sk->sk_write_space(sk);
2b85a34e
ED		 1231 /*
1232 * if sk_wmem_alloc reached 0, we are last user and should
1233 * free this sock, as sk_free() call could not do it.
1234 */
1235 if (res == 0)
1236 __sk_free(sk);
1da177e4 1237}
2a91525c 1238EXPORT_SYMBOL(sock_wfree);
1da177e4 1239
4ec93edb
YH		 1240/*
1241 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1242 */
1243void sock_rfree(struct sk_buff *skb)
1244{
1245 struct sock *sk = skb->sk;
1246
1247 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1248 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4 1249}
2a91525c 1250EXPORT_SYMBOL(sock_rfree);
1da177e4
LT		 1251
1252
1253int sock_i_uid(struct sock *sk)
1254{
1255 int uid;
1256
1257 read_lock(&sk->sk_callback_lock);
1258 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1259 read_unlock(&sk->sk_callback_lock);
1260 return uid;
1261}
2a91525c 1262EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1263
1264unsigned long sock_i_ino(struct sock *sk)
1265{
1266 unsigned long ino;
1267
1268 read_lock(&sk->sk_callback_lock);
1269 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1270 read_unlock(&sk->sk_callback_lock);
1271 return ino;
1272}
2a91525c 1273EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1274
1275/*
1276 * Allocate a skb from the socket's send buffer.
1277 */
86a76caf 1278struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1279 gfp_t priority)
1da177e4
LT		 1280{
1281 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1282 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1283 if (skb) {
1284 skb_set_owner_w(skb, sk);
1285 return skb;
1286 }
1287 }
1288 return NULL;
1289}
2a91525c 1290EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1291
1292/*
1293 * Allocate a skb from the socket's receive buffer.
4ec93edb 1294 */
86a76caf 1295struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1296 gfp_t priority)
1da177e4
LT		 1297{
1298 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1299 struct sk_buff *skb = alloc_skb(size, priority);
1300 if (skb) {
1301 skb_set_owner_r(skb, sk);
1302 return skb;
1303 }
1304 }
1305 return NULL;
1306}
1307
4ec93edb 1308/*
1da177e4 1309 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1310 */
dd0fc66f 1311void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1312{
1313 if ((unsigned)size <= sysctl_optmem_max &&
1314 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1315 void *mem;
1316 /* First do the add, to avoid the race if kmalloc
4ec93edb 1317 * might sleep.
1da177e4
LT		 1318 */
1319 atomic_add(size, &sk->sk_omem_alloc);
1320 mem = kmalloc(size, priority);
1321 if (mem)
1322 return mem;
1323 atomic_sub(size, &sk->sk_omem_alloc);
1324 }
1325 return NULL;
1326}
2a91525c 1327EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1328
1329/*
1330 * Free an option memory block.
1331 */
1332void sock_kfree_s(struct sock *sk, void *mem, int size)
1333{
1334 kfree(mem);
1335 atomic_sub(size, &sk->sk_omem_alloc);
1336}
2a91525c 1337EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1338
1339/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1340 I think, these locks should be removed for datagram sockets.
1341 */
2a91525c 1342static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1343{
1344 DEFINE_WAIT(wait);
1345
1346 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1347 for (;;) {
1348 if (!timeo)
1349 break;
1350 if (signal_pending(current))
1351 break;
1352 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1353 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1354 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1355 break;
1356 if (sk->sk_shutdown & SEND_SHUTDOWN)
1357 break;
1358 if (sk->sk_err)
1359 break;
1360 timeo = schedule_timeout(timeo);
1361 }
1362 finish_wait(sk->sk_sleep, &wait);
1363 return timeo;
1364}
1365
1366
1367/*
1368 * Generic send/receive buffer handlers
1369 */
1370
4cc7f68d
HX		 1371struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1372 unsigned long data_len, int noblock,
1373 int *errcode)
1da177e4
LT		 1374{
1375 struct sk_buff *skb;
7d877f3b 1376 gfp_t gfp_mask;
1da177e4
LT		 1377 long timeo;
1378 int err;
1379
1380 gfp_mask = sk->sk_allocation;
1381 if (gfp_mask & __GFP_WAIT)
1382 gfp_mask |= __GFP_REPEAT;
1383
1384 timeo = sock_sndtimeo(sk, noblock);
1385 while (1) {
1386 err = sock_error(sk);
1387 if (err != 0)
1388 goto failure;
1389
1390 err = -EPIPE;
1391 if (sk->sk_shutdown & SEND_SHUTDOWN)
1392 goto failure;
1393
1394 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1395 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1396 if (skb) {
1397 int npages;
1398 int i;
1399
1400 /* No pages, we're done... */
1401 if (!data_len)
1402 break;
1403
1404 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1405 skb->truesize += data_len;
1406 skb_shinfo(skb)->nr_frags = npages;
1407 for (i = 0; i < npages; i++) {
1408 struct page *page;
1409 skb_frag_t *frag;
1410
1411 page = alloc_pages(sk->sk_allocation, 0);
1412 if (!page) {
1413 err = -ENOBUFS;
1414 skb_shinfo(skb)->nr_frags = i;
1415 kfree_skb(skb);
1416 goto failure;
1417 }
1418
1419 frag = &skb_shinfo(skb)->frags[i];
1420 frag->page = page;
1421 frag->page_offset = 0;
1422 frag->size = (data_len >= PAGE_SIZE ?
1423 PAGE_SIZE :
1424 data_len);
1425 data_len -= PAGE_SIZE;
1426 }
1427
1428 /* Full success... */
1429 break;
1430 }
1431 err = -ENOBUFS;
1432 goto failure;
1433 }
1434 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1435 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1436 err = -EAGAIN;
1437 if (!timeo)
1438 goto failure;
1439 if (signal_pending(current))
1440 goto interrupted;
1441 timeo = sock_wait_for_wmem(sk, timeo);
1442 }
1443
1444 skb_set_owner_w(skb, sk);
1445 return skb;
1446
1447interrupted:
1448 err = sock_intr_errno(timeo);
1449failure:
1450 *errcode = err;
1451 return NULL;
1452}
4cc7f68d 1453EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1454
4ec93edb 1455struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1456 int noblock, int *errcode)
1457{
1458 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1459}
2a91525c 1460EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4
LT		 1461
1462static void __lock_sock(struct sock *sk)
1463{
1464 DEFINE_WAIT(wait);
1465
e71a4783 1466 for (;;) {
1da177e4
LT		 1467 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1468 TASK_UNINTERRUPTIBLE);
1469 spin_unlock_bh(&sk->sk_lock.slock);
1470 schedule();
1471 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1472 if (!sock_owned_by_user(sk))
1da177e4
LT		 1473 break;
1474 }
1475 finish_wait(&sk->sk_lock.wq, &wait);
1476}
1477
1478static void __release_sock(struct sock *sk)
1479{
1480 struct sk_buff *skb = sk->sk_backlog.head;
1481
1482 do {
1483 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1484 bh_unlock_sock(sk);
1485
1486 do {
1487 struct sk_buff *next = skb->next;
1488
1489 skb->next = NULL;
c57943a1 1490 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1491
1492 /*
1493 * We are in process context here with softirqs
1494 * disabled, use cond_resched_softirq() to preempt.
1495 * This is safe to do because we've taken the backlog
1496 * queue private:
1497 */
1498 cond_resched_softirq();
1499
1500 skb = next;
1501 } while (skb != NULL);
1502
1503 bh_lock_sock(sk);
e71a4783 1504 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1505}
1506
1507/**
1508 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1509 * @sk: sock to wait on
1510 * @timeo: for how long
1da177e4
LT		 1511 *
1512 * Now socket state including sk->sk_err is changed only under lock,
1513 * hence we may omit checks after joining wait queue.
1514 * We check receive queue before schedule() only as optimization;
1515 * it is very likely that release_sock() added new data.
1516 */
1517int sk_wait_data(struct sock *sk, long *timeo)
1518{
1519 int rc;
1520 DEFINE_WAIT(wait);
1521
1522 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1523 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1524 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1525 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1526 finish_wait(sk->sk_sleep, &wait);
1527 return rc;
1528}
1da177e4
LT		 1529EXPORT_SYMBOL(sk_wait_data);
1530
3ab224be
HA		 1531/**
1532 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1533 * @sk: socket
1534 * @size: memory size to allocate
1535 * @kind: allocation type
1536 *
1537 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1538 * rmem allocation. This function assumes that protocols which have
1539 * memory_pressure use sk_wmem_queued as write buffer accounting.
1540 */
1541int __sk_mem_schedule(struct sock *sk, int size, int kind)
1542{
1543 struct proto *prot = sk->sk_prot;
1544 int amt = sk_mem_pages(size);
1545 int allocated;
1546
1547 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1548 allocated = atomic_add_return(amt, prot->memory_allocated);
1549
1550 /* Under limit. */
1551 if (allocated <= prot->sysctl_mem[0]) {
1552 if (prot->memory_pressure && *prot->memory_pressure)
1553 *prot->memory_pressure = 0;
1554 return 1;
1555 }
1556
1557 /* Under pressure. */
1558 if (allocated > prot->sysctl_mem[1])
1559 if (prot->enter_memory_pressure)
5c52ba17 1560 prot->enter_memory_pressure(sk);
3ab224be
HA		 1561
1562 /* Over hard limit. */
1563 if (allocated > prot->sysctl_mem[2])
1564 goto suppress_allocation;
1565
1566 /* guarantee minimum buffer size under pressure */
1567 if (kind == SK_MEM_RECV) {
1568 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1569 return 1;
1570 } else { /* SK_MEM_SEND */
1571 if (sk->sk_type == SOCK_STREAM) {
1572 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1573 return 1;
1574 } else if (atomic_read(&sk->sk_wmem_alloc) <
1575 prot->sysctl_wmem[0])
1576 return 1;
1577 }
1578
1579 if (prot->memory_pressure) {
1748376b
ED		 1580 int alloc;
1581
1582 if (!*prot->memory_pressure)
1583 return 1;
1584 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1585 if (prot->sysctl_mem[2] > alloc *
3ab224be
HA		 1586 sk_mem_pages(sk->sk_wmem_queued +
1587 atomic_read(&sk->sk_rmem_alloc) +
1588 sk->sk_forward_alloc))
1589 return 1;
1590 }
1591
1592suppress_allocation:
1593
1594 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1595 sk_stream_moderate_sndbuf(sk);
1596
1597 /* Fail only if socket is _under_ its sndbuf.
1598 * In this case we cannot block, so that we have to fail.
1599 */
1600 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1601 return 1;
1602 }
1603
1604 /* Alas. Undo changes. */
1605 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1606 atomic_sub(amt, prot->memory_allocated);
1607 return 0;
1608}
3ab224be
HA		 1609EXPORT_SYMBOL(__sk_mem_schedule);
1610
1611/**
1612 * __sk_reclaim - reclaim memory_allocated
1613 * @sk: socket
1614 */
1615void __sk_mem_reclaim(struct sock *sk)
1616{
1617 struct proto *prot = sk->sk_prot;
1618
680a5a50 1619 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1620 prot->memory_allocated);
1621 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1622
1623 if (prot->memory_pressure && *prot->memory_pressure &&
1624 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1625 *prot->memory_pressure = 0;
1626}
3ab224be
HA		 1627EXPORT_SYMBOL(__sk_mem_reclaim);
1628
1629
1da177e4
LT		 1630/*
1631 * Set of default routines for initialising struct proto_ops when
1632 * the protocol does not support a particular function. In certain
1633 * cases where it makes no sense for a protocol to have a "do nothing"
1634 * function, some default processing is provided.
1635 */
1636
1637int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1638{
1639 return -EOPNOTSUPP;
1640}
2a91525c 1641EXPORT_SYMBOL(sock_no_bind);
1da177e4 1642
4ec93edb 1643int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1644 int len, int flags)
1645{
1646 return -EOPNOTSUPP;
1647}
2a91525c 1648EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 1649
1650int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1651{
1652 return -EOPNOTSUPP;
1653}
2a91525c 1654EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 1655
1656int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1657{
1658 return -EOPNOTSUPP;
1659}
2a91525c 1660EXPORT_SYMBOL(sock_no_accept);
1da177e4 1661
4ec93edb 1662int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1663 int *len, int peer)
1664{
1665 return -EOPNOTSUPP;
1666}
2a91525c 1667EXPORT_SYMBOL(sock_no_getname);
1da177e4 1668
2a91525c 1669unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 1670{
1671 return 0;
1672}
2a91525c 1673EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 1674
1675int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1676{
1677 return -EOPNOTSUPP;
1678}
2a91525c 1679EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 1680
1681int sock_no_listen(struct socket *sock, int backlog)
1682{
1683 return -EOPNOTSUPP;
1684}
2a91525c 1685EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 1686
1687int sock_no_shutdown(struct socket *sock, int how)
1688{
1689 return -EOPNOTSUPP;
1690}
2a91525c 1691EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 1692
1693int sock_no_setsockopt(struct socket *sock, int level, int optname,
1694 char __user *optval, int optlen)
1695{
1696 return -EOPNOTSUPP;
1697}
2a91525c 1698EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 1699
1700int sock_no_getsockopt(struct socket *sock, int level, int optname,
1701 char __user *optval, int __user *optlen)
1702{
1703 return -EOPNOTSUPP;
1704}
2a91525c 1705EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 1706
1707int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1708 size_t len)
1709{
1710 return -EOPNOTSUPP;
1711}
2a91525c 1712EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 1713
1714int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1715 size_t len, int flags)
1716{
1717 return -EOPNOTSUPP;
1718}
2a91525c 1719EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 1720
1721int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1722{
1723 /* Mirror missing mmap method error code */
1724 return -ENODEV;
1725}
2a91525c 1726EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 1727
1728ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1729{
1730 ssize_t res;
1731 struct msghdr msg = {.msg_flags = flags};
1732 struct kvec iov;
1733 char *kaddr = kmap(page);
1734 iov.iov_base = kaddr + offset;
1735 iov.iov_len = size;
1736 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1737 kunmap(page);
1738 return res;
1739}
2a91525c 1740EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 1741
1742/*
1743 * Default Socket Callbacks
1744 */
1745
1746static void sock_def_wakeup(struct sock *sk)
1747{
1748 read_lock(&sk->sk_callback_lock);
a57de0b4 1749 if (sk_has_sleeper(sk))
1da177e4
LT		 1750 wake_up_interruptible_all(sk->sk_sleep);
1751 read_unlock(&sk->sk_callback_lock);
1752}
1753
1754static void sock_def_error_report(struct sock *sk)
1755{
1756 read_lock(&sk->sk_callback_lock);
a57de0b4 1757 if (sk_has_sleeper(sk))
37e5540b 1758 wake_up_interruptible_poll(sk->sk_sleep, POLLERR);
8d8ad9d7 1759 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1da177e4
LT		 1760 read_unlock(&sk->sk_callback_lock);
1761}
1762
1763static void sock_def_readable(struct sock *sk, int len)
1764{
1765 read_lock(&sk->sk_callback_lock);
a57de0b4 1766 if (sk_has_sleeper(sk))
37e5540b
DL		 1767 wake_up_interruptible_sync_poll(sk->sk_sleep, POLLIN |
1768 POLLRDNORM | POLLRDBAND);
8d8ad9d7 1769 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1da177e4
LT		 1770 read_unlock(&sk->sk_callback_lock);
1771}
1772
1773static void sock_def_write_space(struct sock *sk)
1774{
1775 read_lock(&sk->sk_callback_lock);
1776
1777 /* Do not wake up a writer until he can make "significant"
1778 * progress. --DaveM
1779 */
e71a4783 1780 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
a57de0b4 1781 if (sk_has_sleeper(sk))
37e5540b
DL		 1782 wake_up_interruptible_sync_poll(sk->sk_sleep, POLLOUT |
1783 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 1784
1785 /* Should agree with poll, otherwise some programs break */
1786 if (sock_writeable(sk))
8d8ad9d7 1787 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1788 }
1789
1790 read_unlock(&sk->sk_callback_lock);
1791}
1792
1793static void sock_def_destruct(struct sock *sk)
1794{
a51482bd 1795 kfree(sk->sk_protinfo);
1da177e4
LT		 1796}
1797
1798void sk_send_sigurg(struct sock *sk)
1799{
1800 if (sk->sk_socket && sk->sk_socket->file)
1801 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1802 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 1803}
2a91525c 1804EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 1805
1806void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1807 unsigned long expires)
1808{
1809 if (!mod_timer(timer, expires))
1810 sock_hold(sk);
1811}
1da177e4
LT		 1812EXPORT_SYMBOL(sk_reset_timer);
1813
1814void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1815{
1816 if (timer_pending(timer) && del_timer(timer))
1817 __sock_put(sk);
1818}
1da177e4
LT		 1819EXPORT_SYMBOL(sk_stop_timer);
1820
1821void sock_init_data(struct socket *sock, struct sock *sk)
1822{
1823 skb_queue_head_init(&sk->sk_receive_queue);
1824 skb_queue_head_init(&sk->sk_write_queue);
1825 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1826#ifdef CONFIG_NET_DMA
1827 skb_queue_head_init(&sk->sk_async_wait_queue);
1828#endif
1da177e4
LT		 1829
1830 sk->sk_send_head = NULL;
1831
1832 init_timer(&sk->sk_timer);
4ec93edb 1833
1da177e4
LT		 1834 sk->sk_allocation = GFP_KERNEL;
1835 sk->sk_rcvbuf = sysctl_rmem_default;
1836 sk->sk_sndbuf = sysctl_wmem_default;
1837 sk->sk_state = TCP_CLOSE;
972692e0 1838 sk_set_socket(sk, sock);
1da177e4
LT		 1839
1840 sock_set_flag(sk, SOCK_ZAPPED);
1841
e71a4783 1842 if (sock) {
1da177e4
LT		 1843 sk->sk_type = sock->type;
1844 sk->sk_sleep = &sock->wait;
1845 sock->sk = sk;
1846 } else
1847 sk->sk_sleep = NULL;
1848
1849 rwlock_init(&sk->sk_dst_lock);
1850 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1851 lockdep_set_class_and_name(&sk->sk_callback_lock,
1852 af_callback_keys + sk->sk_family,
1853 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1854
1855 sk->sk_state_change = sock_def_wakeup;
1856 sk->sk_data_ready = sock_def_readable;
1857 sk->sk_write_space = sock_def_write_space;
1858 sk->sk_error_report = sock_def_error_report;
1859 sk->sk_destruct = sock_def_destruct;
1860
1861 sk->sk_sndmsg_page = NULL;
1862 sk->sk_sndmsg_off = 0;
1863
1864 sk->sk_peercred.pid = 0;
1865 sk->sk_peercred.uid = -1;
1866 sk->sk_peercred.gid = -1;
1867 sk->sk_write_pending = 0;
1868 sk->sk_rcvlowat = 1;
1869 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1870 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1871
f37f0afb 1872 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 1873
4dc6dc71
ED		 1874 /*
1875 * Before updating sk_refcnt, we must commit prior changes to memory
1876 * (Documentation/RCU/rculist_nulls.txt for details)
1877 */
1878 smp_wmb();
1da177e4 1879 atomic_set(&sk->sk_refcnt, 1);
2b85a34e 1880 atomic_set(&sk->sk_wmem_alloc, 1);
33c732c3 1881 atomic_set(&sk->sk_drops, 0);
1da177e4 1882}
2a91525c 1883EXPORT_SYMBOL(sock_init_data);
1da177e4 1884
b5606c2d 1885void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1886{
1887 might_sleep();
a5b5bb9a 1888 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1889 if (sk->sk_lock.owned)
1da177e4 1890 __lock_sock(sk);
d2e9117c 1891 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1892 spin_unlock(&sk->sk_lock.slock);
1893 /*
1894 * The sk_lock has mutex_lock() semantics here:
1895 */
fcc70d5f 1896 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1897 local_bh_enable();
1da177e4 1898}
fcc70d5f 1899EXPORT_SYMBOL(lock_sock_nested);
1da177e4 1900
b5606c2d 1901void release_sock(struct sock *sk)
1da177e4 1902{
a5b5bb9a
IM		 1903 /*
1904 * The sk_lock has mutex_unlock() semantics:
1905 */
1906 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1907
1908 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1909 if (sk->sk_backlog.tail)
1910 __release_sock(sk);
d2e9117c 1911 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1912 if (waitqueue_active(&sk->sk_lock.wq))
1913 wake_up(&sk->sk_lock.wq);
1914 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1915}
1916EXPORT_SYMBOL(release_sock);
1917
1918int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1919{
b7aa0bf7 1920 struct timeval tv;
1da177e4 1921 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 1922 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 1923 tv = ktime_to_timeval(sk->sk_stamp);
1924 if (tv.tv_sec == -1)
1da177e4 1925 return -ENOENT;
b7aa0bf7
ED		 1926 if (tv.tv_sec == 0) {
1927 sk->sk_stamp = ktime_get_real();
1928 tv = ktime_to_timeval(sk->sk_stamp);
1929 }
1930 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1931}
1da177e4
LT		 1932EXPORT_SYMBOL(sock_get_timestamp);
1933
ae40eb1e
ED		 1934int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1935{
1936 struct timespec ts;
1937 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 1938 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 1939 ts = ktime_to_timespec(sk->sk_stamp);
1940 if (ts.tv_sec == -1)
1941 return -ENOENT;
1942 if (ts.tv_sec == 0) {
1943 sk->sk_stamp = ktime_get_real();
1944 ts = ktime_to_timespec(sk->sk_stamp);
1945 }
1946 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1947}
1948EXPORT_SYMBOL(sock_get_timestampns);
1949
20d49473 1950void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 1951{
20d49473
PO		 1952 if (!sock_flag(sk, flag)) {
1953 sock_set_flag(sk, flag);
1954 /*
1955 * we just set one of the two flags which require net
1956 * time stamping, but time stamping might have been on
1957 * already because of the other one
1958 */
1959 if (!sock_flag(sk,
1960 flag == SOCK_TIMESTAMP ?
1961 SOCK_TIMESTAMPING_RX_SOFTWARE :
1962 SOCK_TIMESTAMP))
1963 net_enable_timestamp();
1da177e4
LT		 1964 }
1965}
1da177e4
LT		 1966
1967/*
1968 * Get a socket option on an socket.
1969 *
1970 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1971 * asynchronous errors should be reported by getsockopt. We assume
1972 * this means if you specify SO_ERROR (otherwise whats the point of it).
1973 */
1974int sock_common_getsockopt(struct socket *sock, int level, int optname,
1975 char __user *optval, int __user *optlen)
1976{
1977 struct sock *sk = sock->sk;
1978
1979 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1980}
1da177e4
LT		 1981EXPORT_SYMBOL(sock_common_getsockopt);
1982
3fdadf7d 1983#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1984int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1985 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1986{
1987 struct sock *sk = sock->sk;
1988
1e51f951 1989 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 1990 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1991 optval, optlen);
3fdadf7d
DM		 1992 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1993}
1994EXPORT_SYMBOL(compat_sock_common_getsockopt);
1995#endif
1996
1da177e4
LT		 1997int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1998 struct msghdr *msg, size_t size, int flags)
1999{
2000 struct sock *sk = sock->sk;
2001 int addr_len = 0;
2002 int err;
2003
2004 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2005 flags & ~MSG_DONTWAIT, &addr_len);
2006 if (err >= 0)
2007 msg->msg_namelen = addr_len;
2008 return err;
2009}
1da177e4
LT		 2010EXPORT_SYMBOL(sock_common_recvmsg);
2011
2012/*
2013 * Set socket options on an inet socket.
2014 */
2015int sock_common_setsockopt(struct socket *sock, int level, int optname,
2016 char __user *optval, int optlen)
2017{
2018 struct sock *sk = sock->sk;
2019
2020 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2021}
1da177e4
LT		 2022EXPORT_SYMBOL(sock_common_setsockopt);
2023
3fdadf7d 2024#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2025int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2026 char __user *optval, int optlen)
3fdadf7d
DM		 2027{
2028 struct sock *sk = sock->sk;
2029
543d9cfe
ACM		 2030 if (sk->sk_prot->compat_setsockopt != NULL)
2031 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2032 optval, optlen);
3fdadf7d
DM		 2033 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2034}
2035EXPORT_SYMBOL(compat_sock_common_setsockopt);
2036#endif
2037
1da177e4
LT		 2038void sk_common_release(struct sock *sk)
2039{
2040 if (sk->sk_prot->destroy)
2041 sk->sk_prot->destroy(sk);
2042
2043 /*
2044 * Observation: when sock_common_release is called, processes have
2045 * no access to socket. But net still has.
2046 * Step one, detach it from networking:
2047 *
2048 * A. Remove from hash tables.
2049 */
2050
2051 sk->sk_prot->unhash(sk);
2052
2053 /*
2054 * In this point socket cannot receive new packets, but it is possible
2055 * that some packets are in flight because some CPU runs receiver and
2056 * did hash table lookup before we unhashed socket. They will achieve
2057 * receive queue and will be purged by socket destructor.
2058 *
2059 * Also we still have packets pending on receive queue and probably,
2060 * our own packets waiting in device queues. sock_destroy will drain
2061 * receive queue, but transmitted packets will delay socket destruction
2062 * until the last reference will be released.
2063 */
2064
2065 sock_orphan(sk);
2066
2067 xfrm_sk_free_policy(sk);
2068
e6848976 2069 sk_refcnt_debug_release(sk);
1da177e4
LT		 2070 sock_put(sk);
2071}
1da177e4
LT		 2072EXPORT_SYMBOL(sk_common_release);
2073
2074static DEFINE_RWLOCK(proto_list_lock);
2075static LIST_HEAD(proto_list);
2076
13ff3d6f
PE		 2077#ifdef CONFIG_PROC_FS
2078#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2079struct prot_inuse {
2080 int val[PROTO_INUSE_NR];
2081};
13ff3d6f
PE		 2082
2083static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2084
2085#ifdef CONFIG_NET_NS
2086void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2087{
2088 int cpu = smp_processor_id();
2089 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
2090}
2091EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2092
2093int sock_prot_inuse_get(struct net *net, struct proto *prot)
2094{
2095 int cpu, idx = prot->inuse_idx;
2096 int res = 0;
2097
2098 for_each_possible_cpu(cpu)
2099 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2100
2101 return res >= 0 ? res : 0;
2102}
2103EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2104
2105static int sock_inuse_init_net(struct net *net)
2106{
2107 net->core.inuse = alloc_percpu(struct prot_inuse);
2108 return net->core.inuse ? 0 : -ENOMEM;
2109}
2110
2111static void sock_inuse_exit_net(struct net *net)
2112{
2113 free_percpu(net->core.inuse);
2114}
2115
2116static struct pernet_operations net_inuse_ops = {
2117 .init = sock_inuse_init_net,
2118 .exit = sock_inuse_exit_net,
2119};
2120
2121static __init int net_inuse_init(void)
2122{
2123 if (register_pernet_subsys(&net_inuse_ops))
2124 panic("Cannot initialize net inuse counters");
2125
2126 return 0;
2127}
2128
2129core_initcall(net_inuse_init);
2130#else
1338d466
PE		 2131static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2132
c29a0bc4 2133void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466
PE		 2134{
2135 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
2136}
2137EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2138
c29a0bc4 2139int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2140{
2141 int cpu, idx = prot->inuse_idx;
2142 int res = 0;
2143
2144 for_each_possible_cpu(cpu)
2145 res += per_cpu(prot_inuse, cpu).val[idx];
2146
2147 return res >= 0 ? res : 0;
2148}
2149EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2150#endif
13ff3d6f
PE		 2151
2152static void assign_proto_idx(struct proto *prot)
2153{
2154 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2155
2156 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2157 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2158 return;
2159 }
2160
2161 set_bit(prot->inuse_idx, proto_inuse_idx);
2162}
2163
2164static void release_proto_idx(struct proto *prot)
2165{
2166 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2167 clear_bit(prot->inuse_idx, proto_inuse_idx);
2168}
2169#else
2170static inline void assign_proto_idx(struct proto *prot)
2171{
2172}
2173
2174static inline void release_proto_idx(struct proto *prot)
2175{
2176}
2177#endif
2178
b733c007
PE		 2179int proto_register(struct proto *prot, int alloc_slab)
2180{
1da177e4
LT		 2181 if (alloc_slab) {
2182 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2183 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2184 NULL);
1da177e4
LT		 2185
2186 if (prot->slab == NULL) {
2187 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2188 prot->name);
60e7663d 2189 goto out;
1da177e4 2190 }
2e6599cb
ACM		 2191
2192 if (prot->rsk_prot != NULL) {
2193 static const char mask[] = "request_sock_%s";
2194
7e56b5d6
CM		 2195 prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2196 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2197 goto out_free_sock_slab;
2198
7e56b5d6
CM		 2199 sprintf(prot->rsk_prot->slab_name, mask, prot->name);
2200 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2201 prot->rsk_prot->obj_size, 0,
20c2df83 2202 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2203
2204 if (prot->rsk_prot->slab == NULL) {
2205 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2206 prot->name);
2207 goto out_free_request_sock_slab_name;
2208 }
2209 }
8feaf0c0 2210
6d6ee43e 2211 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 2212 static const char mask[] = "tw_sock_%s";
2213
7e56b5d6 2214 prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
8feaf0c0 2215
7e56b5d6 2216 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2217 goto out_free_request_sock_slab;
2218
7e56b5d6 2219 sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name);
6d6ee43e 2220 prot->twsk_prot->twsk_slab =
7e56b5d6 2221 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2222 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2223 0,
2224 SLAB_HWCACHE_ALIGN |
2225 prot->slab_flags,
20c2df83 2226 NULL);
6d6ee43e 2227 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2228 goto out_free_timewait_sock_slab_name;
2229 }
1da177e4
LT		 2230 }
2231
2a278051 2232 write_lock(&proto_list_lock);
1da177e4 2233 list_add(&prot->node, &proto_list);
13ff3d6f 2234 assign_proto_idx(prot);
1da177e4 2235 write_unlock(&proto_list_lock);
b733c007
PE		 2236 return 0;
2237
8feaf0c0 2238out_free_timewait_sock_slab_name:
7e56b5d6 2239 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2240out_free_request_sock_slab:
2241 if (prot->rsk_prot && prot->rsk_prot->slab) {
2242 kmem_cache_destroy(prot->rsk_prot->slab);
2243 prot->rsk_prot->slab = NULL;
2244 }
2e6599cb 2245out_free_request_sock_slab_name:
7e56b5d6 2246 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2247out_free_sock_slab:
2248 kmem_cache_destroy(prot->slab);
2249 prot->slab = NULL;
b733c007
PE		 2250out:
2251 return -ENOBUFS;
1da177e4 2252}
1da177e4
LT		 2253EXPORT_SYMBOL(proto_register);
2254
2255void proto_unregister(struct proto *prot)
2256{
2257 write_lock(&proto_list_lock);
13ff3d6f 2258 release_proto_idx(prot);
0a3f4358
PM		 2259 list_del(&prot->node);
2260 write_unlock(&proto_list_lock);
1da177e4
LT		 2261
2262 if (prot->slab != NULL) {
2263 kmem_cache_destroy(prot->slab);
2264 prot->slab = NULL;
2265 }
2266
2e6599cb 2267 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2268 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2269 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2270 prot->rsk_prot->slab = NULL;
2271 }
2272
6d6ee43e 2273 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2274 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2275 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2276 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2277 }
1da177e4 2278}
1da177e4
LT		 2279EXPORT_SYMBOL(proto_unregister);
2280
2281#ifdef CONFIG_PROC_FS
1da177e4 2282static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2283 __acquires(proto_list_lock)
1da177e4
LT		 2284{
2285 read_lock(&proto_list_lock);
60f0438a 2286 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2287}
2288
2289static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2290{
60f0438a 2291 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2292}
2293
2294static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2295 __releases(proto_list_lock)
1da177e4
LT		 2296{
2297 read_unlock(&proto_list_lock);
2298}
2299
2300static char proto_method_implemented(const void *method)
2301{
2302 return method == NULL ? 'n' : 'y';
2303}
2304
2305static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2306{
2307 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2308 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2309 proto->name,
2310 proto->obj_size,
14e943db 2311 sock_prot_inuse_get(seq_file_net(seq), proto),
1da177e4
LT		 2312 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2313 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2314 proto->max_header,
2315 proto->slab == NULL ? "no" : "yes",
2316 module_name(proto->owner),
2317 proto_method_implemented(proto->close),
2318 proto_method_implemented(proto->connect),
2319 proto_method_implemented(proto->disconnect),
2320 proto_method_implemented(proto->accept),
2321 proto_method_implemented(proto->ioctl),
2322 proto_method_implemented(proto->init),
2323 proto_method_implemented(proto->destroy),
2324 proto_method_implemented(proto->shutdown),
2325 proto_method_implemented(proto->setsockopt),
2326 proto_method_implemented(proto->getsockopt),
2327 proto_method_implemented(proto->sendmsg),
2328 proto_method_implemented(proto->recvmsg),
2329 proto_method_implemented(proto->sendpage),
2330 proto_method_implemented(proto->bind),
2331 proto_method_implemented(proto->backlog_rcv),
2332 proto_method_implemented(proto->hash),
2333 proto_method_implemented(proto->unhash),
2334 proto_method_implemented(proto->get_port),
2335 proto_method_implemented(proto->enter_memory_pressure));
2336}
2337
2338static int proto_seq_show(struct seq_file *seq, void *v)
2339{
60f0438a 2340 if (v == &proto_list)
1da177e4
LT		 2341 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2342 "protocol",
2343 "size",
2344 "sockets",
2345 "memory",
2346 "press",
2347 "maxhdr",
2348 "slab",
2349 "module",
2350 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2351 else
60f0438a 2352 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2353 return 0;
2354}
2355
f690808e 2356static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2357 .start = proto_seq_start,
2358 .next = proto_seq_next,
2359 .stop = proto_seq_stop,
2360 .show = proto_seq_show,
2361};
2362
2363static int proto_seq_open(struct inode *inode, struct file *file)
2364{
14e943db
ED		 2365 return seq_open_net(inode, file, &proto_seq_ops,
2366 sizeof(struct seq_net_private));
1da177e4
LT		 2367}
2368
9a32144e 2369static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2370 .owner = THIS_MODULE,
2371 .open = proto_seq_open,
2372 .read = seq_read,
2373 .llseek = seq_lseek,
14e943db
ED		 2374 .release = seq_release_net,
2375};
2376
2377static __net_init int proto_init_net(struct net *net)
2378{
2379 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2380 return -ENOMEM;
2381
2382 return 0;
2383}
2384
2385static __net_exit void proto_exit_net(struct net *net)
2386{
2387 proc_net_remove(net, "protocols");
2388}
2389
2390
2391static __net_initdata struct pernet_operations proto_net_ops = {
2392 .init = proto_init_net,
2393 .exit = proto_exit_net,
1da177e4
LT		 2394};
2395
2396static int __init proto_init(void)
2397{
14e943db 2398 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2399}
2400
2401subsys_initcall(proto_init);
2402
2403#endif /* PROC_FS */
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