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net: relax rcvbuf limits
[mirror_ubuntu-zesty-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>
3f551f94 113#include <linux/user_namespace.h>
1da177e4
LT		 114
115#include <asm/uaccess.h>
116#include <asm/system.h>
117
118#include <linux/netdevice.h>
119#include <net/protocol.h>
120#include <linux/skbuff.h>
457c4cbc 121#include <net/net_namespace.h>
2e6599cb 122#include <net/request_sock.h>
1da177e4 123#include <net/sock.h>
20d49473 124#include <linux/net_tstamp.h>
1da177e4
LT		 125#include <net/xfrm.h>
126#include <linux/ipsec.h>
f8451725 127#include <net/cls_cgroup.h>
1da177e4
LT		 128
129#include <linux/filter.h>
130
3847ce32
SM		 131#include <trace/events/sock.h>
132
1da177e4
LT		 133#ifdef CONFIG_INET
134#include <net/tcp.h>
135#endif
136
da21f24d
IM		 137/*
138 * Each address family might have different locking rules, so we have
139 * one slock key per address family:
140 */
a5b5bb9a
IM		 141static struct lock_class_key af_family_keys[AF_MAX];
142static struct lock_class_key af_family_slock_keys[AF_MAX];
143
a5b5bb9a
IM		 144/*
145 * Make lock validator output more readable. (we pre-construct these
146 * strings build-time, so that runtime initialization of socket
147 * locks is fast):
148 */
36cbd3dc 149static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 150 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
151 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
152 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
153 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
154 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
155 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
156 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 157 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 158 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 159 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 160 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 161 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 162 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
c7fe3b52 163 "sk_lock-AF_NFC" , "sk_lock-AF_MAX"
a5b5bb9a 164};
36cbd3dc 165static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 166 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
167 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
168 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
169 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
170 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
171 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
172 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 173 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 174 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 175 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 176 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 177 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 178 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
c7fe3b52 179 "slock-AF_NFC" , "slock-AF_MAX"
a5b5bb9a 180};
36cbd3dc 181static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 182 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
183 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
184 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
185 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
186 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
187 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
188 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 189 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 190 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 191 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 192 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 193 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 194 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
c7fe3b52 195 "clock-AF_NFC" , "clock-AF_MAX"
443aef0e 196};
da21f24d
IM		 197
198/*
199 * sk_callback_lock locking rules are per-address-family,
200 * so split the lock classes by using a per-AF key:
201 */
202static struct lock_class_key af_callback_keys[AF_MAX];
203
1da177e4
LT		 204/* Take into consideration the size of the struct sk_buff overhead in the
205 * determination of these values, since that is non-constant across
206 * platforms. This makes socket queueing behavior and performance
207 * not depend upon such differences.
208 */
209#define _SK_MEM_PACKETS 256
87fb4b7b 210#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 211#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
212#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
213
214/* Run time adjustable parameters. */
ab32ea5d
BH		 215__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
216__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
217__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
218__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 219
25985edc 220/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 221int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 222EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 223
f8451725
HX		 224#if defined(CONFIG_CGROUPS) && !defined(CONFIG_NET_CLS_CGROUP)
225int net_cls_subsys_id = -1;
226EXPORT_SYMBOL_GPL(net_cls_subsys_id);
227#endif
228
1da177e4
LT		 229static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
230{
231 struct timeval tv;
232
233 if (optlen < sizeof(tv))
234 return -EINVAL;
235 if (copy_from_user(&tv, optval, sizeof(tv)))
236 return -EFAULT;
ba78073e
VA		 237 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
238 return -EDOM;
1da177e4 239
ba78073e 240 if (tv.tv_sec < 0) {
6f11df83
AM		 241 static int warned __read_mostly;
242
ba78073e 243 *timeo_p = 0;
50aab54f 244 if (warned < 10 && net_ratelimit()) {
ba78073e
VA		 245 warned++;
246 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
247 "tries to set negative timeout\n",
ba25f9dc 248 current->comm, task_pid_nr(current));
50aab54f 249 }
ba78073e
VA		 250 return 0;
251 }
1da177e4
LT		 252 *timeo_p = MAX_SCHEDULE_TIMEOUT;
253 if (tv.tv_sec == 0 && tv.tv_usec == 0)
254 return 0;
255 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
256 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
257 return 0;
258}
259
260static void sock_warn_obsolete_bsdism(const char *name)
261{
262 static int warned;
263 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 264 if (strcmp(warncomm, current->comm) && warned < 5) {
265 strcpy(warncomm, current->comm);
1da177e4
LT		 266 printk(KERN_WARNING "process `%s' is using obsolete "
267 "%s SO_BSDCOMPAT\n", warncomm, name);
268 warned++;
269 }
270}
271
20d49473 272static void sock_disable_timestamp(struct sock *sk, int flag)
4ec93edb 273{
20d49473
PO		 274 if (sock_flag(sk, flag)) {
275 sock_reset_flag(sk, flag);
276 if (!sock_flag(sk, SOCK_TIMESTAMP) &&
277 !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) {
278 net_disable_timestamp();
279 }
1da177e4
LT		 280 }
281}
282
283
f0088a50
DV		 284int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
285{
766e9037 286 int err;
f0088a50 287 int skb_len;
3b885787
NH		 288 unsigned long flags;
289 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 290
0fd7bac6 291 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 292 atomic_inc(&sk->sk_drops);
3847ce32 293 trace_sock_rcvqueue_full(sk, skb);
766e9037 294 return -ENOMEM;
f0088a50
DV		 295 }
296
fda9ef5d 297 err = sk_filter(sk, skb);
f0088a50 298 if (err)
766e9037 299 return err;
f0088a50 300
3ab224be 301 if (!sk_rmem_schedule(sk, skb->truesize)) {
766e9037
ED		 302 atomic_inc(&sk->sk_drops);
303 return -ENOBUFS;
3ab224be
HA		 304 }
305
f0088a50
DV		 306 skb->dev = NULL;
307 skb_set_owner_r(skb, sk);
49ad9599 308
f0088a50
DV		 309 /* Cache the SKB length before we tack it onto the receive
310 * queue. Once it is added it no longer belongs to us and
311 * may be freed by other threads of control pulling packets
312 * from the queue.
313 */
314 skb_len = skb->len;
315
7fee226a
ED		 316 /* we escape from rcu protected region, make sure we dont leak
317 * a norefcounted dst
318 */
319 skb_dst_force(skb);
320
3b885787
NH		 321 spin_lock_irqsave(&list->lock, flags);
322 skb->dropcount = atomic_read(&sk->sk_drops);
323 __skb_queue_tail(list, skb);
324 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 325
326 if (!sock_flag(sk, SOCK_DEAD))
327 sk->sk_data_ready(sk, skb_len);
766e9037 328 return 0;
f0088a50
DV		 329}
330EXPORT_SYMBOL(sock_queue_rcv_skb);
331
58a5a7b9 332int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 333{
334 int rc = NET_RX_SUCCESS;
335
fda9ef5d 336 if (sk_filter(sk, skb))
f0088a50
DV		 337 goto discard_and_relse;
338
339 skb->dev = NULL;
340
c377411f
ED		 341 if (sk_rcvqueues_full(sk, skb)) {
342 atomic_inc(&sk->sk_drops);
343 goto discard_and_relse;
344 }
58a5a7b9
ACM		 345 if (nested)
346 bh_lock_sock_nested(sk);
347 else
348 bh_lock_sock(sk);
a5b5bb9a
IM		 349 if (!sock_owned_by_user(sk)) {
350 /*
351 * trylock + unlock semantics:
352 */
353 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
354
c57943a1 355 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 356
357 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
a3a858ff 358 } else if (sk_add_backlog(sk, skb)) {
8eae939f
ZY		 359 bh_unlock_sock(sk);
360 atomic_inc(&sk->sk_drops);
361 goto discard_and_relse;
362 }
363
f0088a50
DV		 364 bh_unlock_sock(sk);
365out:
366 sock_put(sk);
367 return rc;
368discard_and_relse:
369 kfree_skb(skb);
370 goto out;
371}
372EXPORT_SYMBOL(sk_receive_skb);
373
ea94ff3b
KK		 374void sk_reset_txq(struct sock *sk)
375{
376 sk_tx_queue_clear(sk);
377}
378EXPORT_SYMBOL(sk_reset_txq);
379
f0088a50
DV		 380struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
381{
b6c6712a 382 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 383
384 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 385 sk_tx_queue_clear(sk);
a9b3cd7f 386 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 387 dst_release(dst);
388 return NULL;
389 }
390
391 return dst;
392}
393EXPORT_SYMBOL(__sk_dst_check);
394
395struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
396{
397 struct dst_entry *dst = sk_dst_get(sk);
398
399 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
400 sk_dst_reset(sk);
401 dst_release(dst);
402 return NULL;
403 }
404
405 return dst;
406}
407EXPORT_SYMBOL(sk_dst_check);
408
4878809f
DM		 409static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
410{
411 int ret = -ENOPROTOOPT;
412#ifdef CONFIG_NETDEVICES
3b1e0a65 413 struct net *net = sock_net(sk);
4878809f
DM		 414 char devname[IFNAMSIZ];
415 int index;
416
417 /* Sorry... */
418 ret = -EPERM;
419 if (!capable(CAP_NET_RAW))
420 goto out;
421
422 ret = -EINVAL;
423 if (optlen < 0)
424 goto out;
425
426 /* Bind this socket to a particular device like "eth0",
427 * as specified in the passed interface name. If the
428 * name is "" or the option length is zero the socket
429 * is not bound.
430 */
431 if (optlen > IFNAMSIZ - 1)
432 optlen = IFNAMSIZ - 1;
433 memset(devname, 0, sizeof(devname));
434
435 ret = -EFAULT;
436 if (copy_from_user(devname, optval, optlen))
437 goto out;
438
000ba2e4
DM		 439 index = 0;
440 if (devname[0] != '\0') {
bf8e56bf 441 struct net_device *dev;
4878809f 442
bf8e56bf
ED		 443 rcu_read_lock();
444 dev = dev_get_by_name_rcu(net, devname);
445 if (dev)
446 index = dev->ifindex;
447 rcu_read_unlock();
4878809f
DM		 448 ret = -ENODEV;
449 if (!dev)
450 goto out;
4878809f
DM		 451 }
452
453 lock_sock(sk);
454 sk->sk_bound_dev_if = index;
455 sk_dst_reset(sk);
456 release_sock(sk);
457
458 ret = 0;
459
460out:
461#endif
462
463 return ret;
464}
465
c0ef877b
PE		 466static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
467{
468 if (valbool)
469 sock_set_flag(sk, bit);
470 else
471 sock_reset_flag(sk, bit);
472}
473
1da177e4
LT		 474/*
475 * This is meant for all protocols to use and covers goings on
476 * at the socket level. Everything here is generic.
477 */
478
479int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 480 char __user *optval, unsigned int optlen)
1da177e4 481{
2a91525c 482 struct sock *sk = sock->sk;
1da177e4
LT		 483 int val;
484 int valbool;
485 struct linger ling;
486 int ret = 0;
4ec93edb 487
1da177e4
LT		 488 /*
489 * Options without arguments
490 */
491
4878809f
DM		 492 if (optname == SO_BINDTODEVICE)
493 return sock_bindtodevice(sk, optval, optlen);
494
e71a4783
SH		 495 if (optlen < sizeof(int))
496 return -EINVAL;
4ec93edb 497
1da177e4
LT		 498 if (get_user(val, (int __user *)optval))
499 return -EFAULT;
4ec93edb 500
2a91525c 501 valbool = val ? 1 : 0;
1da177e4
LT		 502
503 lock_sock(sk);
504
2a91525c 505 switch (optname) {
e71a4783 506 case SO_DEBUG:
2a91525c 507 if (val && !capable(CAP_NET_ADMIN))
e71a4783 508 ret = -EACCES;
2a91525c 509 else
c0ef877b 510 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 511 break;
512 case SO_REUSEADDR:
513 sk->sk_reuse = valbool;
514 break;
515 case SO_TYPE:
49c794e9 516 case SO_PROTOCOL:
0d6038ee 517 case SO_DOMAIN:
e71a4783
SH		 518 case SO_ERROR:
519 ret = -ENOPROTOOPT;
520 break;
521 case SO_DONTROUTE:
c0ef877b 522 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 523 break;
524 case SO_BROADCAST:
525 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
526 break;
527 case SO_SNDBUF:
528 /* Don't error on this BSD doesn't and if you think
529 about it this is right. Otherwise apps have to
530 play 'guess the biggest size' games. RCVBUF/SNDBUF
531 are treated in BSD as hints */
532
533 if (val > sysctl_wmem_max)
534 val = sysctl_wmem_max;
b0573dea 535set_sndbuf:
e71a4783
SH		 536 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
537 if ((val * 2) < SOCK_MIN_SNDBUF)
538 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
539 else
540 sk->sk_sndbuf = val * 2;
1da177e4 541
e71a4783
SH		 542 /*
543 * Wake up sending tasks if we
544 * upped the value.
545 */
546 sk->sk_write_space(sk);
547 break;
1da177e4 548
e71a4783
SH		 549 case SO_SNDBUFFORCE:
550 if (!capable(CAP_NET_ADMIN)) {
551 ret = -EPERM;
552 break;
553 }
554 goto set_sndbuf;
b0573dea 555
e71a4783
SH		 556 case SO_RCVBUF:
557 /* Don't error on this BSD doesn't and if you think
558 about it this is right. Otherwise apps have to
559 play 'guess the biggest size' games. RCVBUF/SNDBUF
560 are treated in BSD as hints */
4ec93edb 561
e71a4783
SH		 562 if (val > sysctl_rmem_max)
563 val = sysctl_rmem_max;
b0573dea 564set_rcvbuf:
e71a4783
SH		 565 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
566 /*
567 * We double it on the way in to account for
568 * "struct sk_buff" etc. overhead. Applications
569 * assume that the SO_RCVBUF setting they make will
570 * allow that much actual data to be received on that
571 * socket.
572 *
573 * Applications are unaware that "struct sk_buff" and
574 * other overheads allocate from the receive buffer
575 * during socket buffer allocation.
576 *
577 * And after considering the possible alternatives,
578 * returning the value we actually used in getsockopt
579 * is the most desirable behavior.
580 */
581 if ((val * 2) < SOCK_MIN_RCVBUF)
582 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
583 else
584 sk->sk_rcvbuf = val * 2;
585 break;
586
587 case SO_RCVBUFFORCE:
588 if (!capable(CAP_NET_ADMIN)) {
589 ret = -EPERM;
1da177e4 590 break;
e71a4783
SH		 591 }
592 goto set_rcvbuf;
1da177e4 593
e71a4783 594 case SO_KEEPALIVE:
1da177e4 595#ifdef CONFIG_INET
e71a4783
SH		 596 if (sk->sk_protocol == IPPROTO_TCP)
597 tcp_set_keepalive(sk, valbool);
1da177e4 598#endif
e71a4783
SH		 599 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
600 break;
601
602 case SO_OOBINLINE:
603 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
604 break;
605
606 case SO_NO_CHECK:
607 sk->sk_no_check = valbool;
608 break;
609
610 case SO_PRIORITY:
611 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
612 sk->sk_priority = val;
613 else
614 ret = -EPERM;
615 break;
616
617 case SO_LINGER:
618 if (optlen < sizeof(ling)) {
619 ret = -EINVAL; /* 1003.1g */
1da177e4 620 break;
e71a4783 621 }
2a91525c 622 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 623 ret = -EFAULT;
1da177e4 624 break;
e71a4783
SH		 625 }
626 if (!ling.l_onoff)
627 sock_reset_flag(sk, SOCK_LINGER);
628 else {
1da177e4 629#if (BITS_PER_LONG == 32)
e71a4783
SH		 630 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
631 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 632 else
e71a4783
SH		 633#endif
634 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
635 sock_set_flag(sk, SOCK_LINGER);
636 }
637 break;
638
639 case SO_BSDCOMPAT:
640 sock_warn_obsolete_bsdism("setsockopt");
641 break;
642
643 case SO_PASSCRED:
644 if (valbool)
645 set_bit(SOCK_PASSCRED, &sock->flags);
646 else
647 clear_bit(SOCK_PASSCRED, &sock->flags);
648 break;
649
650 case SO_TIMESTAMP:
92f37fd2 651 case SO_TIMESTAMPNS:
e71a4783 652 if (valbool) {
92f37fd2
ED		 653 if (optname == SO_TIMESTAMP)
654 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
655 else
656 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 657 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 658 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 659 } else {
e71a4783 660 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 661 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
662 }
e71a4783
SH		 663 break;
664
20d49473
PO		 665 case SO_TIMESTAMPING:
666 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 667 ret = -EINVAL;
20d49473
PO		 668 break;
669 }
670 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
671 val & SOF_TIMESTAMPING_TX_HARDWARE);
672 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
673 val & SOF_TIMESTAMPING_TX_SOFTWARE);
674 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
675 val & SOF_TIMESTAMPING_RX_HARDWARE);
676 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
677 sock_enable_timestamp(sk,
678 SOCK_TIMESTAMPING_RX_SOFTWARE);
679 else
680 sock_disable_timestamp(sk,
681 SOCK_TIMESTAMPING_RX_SOFTWARE);
682 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
683 val & SOF_TIMESTAMPING_SOFTWARE);
684 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
685 val & SOF_TIMESTAMPING_SYS_HARDWARE);
686 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
687 val & SOF_TIMESTAMPING_RAW_HARDWARE);
688 break;
689
e71a4783
SH		 690 case SO_RCVLOWAT:
691 if (val < 0)
692 val = INT_MAX;
693 sk->sk_rcvlowat = val ? : 1;
694 break;
695
696 case SO_RCVTIMEO:
697 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
698 break;
699
700 case SO_SNDTIMEO:
701 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
702 break;
1da177e4 703
e71a4783
SH		 704 case SO_ATTACH_FILTER:
705 ret = -EINVAL;
706 if (optlen == sizeof(struct sock_fprog)) {
707 struct sock_fprog fprog;
1da177e4 708
e71a4783
SH		 709 ret = -EFAULT;
710 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 711 break;
e71a4783
SH		 712
713 ret = sk_attach_filter(&fprog, sk);
714 }
715 break;
716
717 case SO_DETACH_FILTER:
55b33325 718 ret = sk_detach_filter(sk);
e71a4783 719 break;
1da177e4 720
e71a4783
SH		 721 case SO_PASSSEC:
722 if (valbool)
723 set_bit(SOCK_PASSSEC, &sock->flags);
724 else
725 clear_bit(SOCK_PASSSEC, &sock->flags);
726 break;
4a19ec58
LAT		 727 case SO_MARK:
728 if (!capable(CAP_NET_ADMIN))
729 ret = -EPERM;
2a91525c 730 else
4a19ec58 731 sk->sk_mark = val;
4a19ec58 732 break;
877ce7c1 733
1da177e4
LT		 734 /* We implement the SO_SNDLOWAT etc to
735 not be settable (1003.1g 5.3) */
3b885787 736 case SO_RXQ_OVFL:
8083f0fc 737 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 738 break;
e71a4783
SH		 739 default:
740 ret = -ENOPROTOOPT;
741 break;
4ec93edb 742 }
1da177e4
LT		 743 release_sock(sk);
744 return ret;
745}
2a91525c 746EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 747
748
3f551f94
EB		 749void cred_to_ucred(struct pid *pid, const struct cred *cred,
750 struct ucred *ucred)
751{
752 ucred->pid = pid_vnr(pid);
753 ucred->uid = ucred->gid = -1;
754 if (cred) {
755 struct user_namespace *current_ns = current_user_ns();
756
757 ucred->uid = user_ns_map_uid(current_ns, cred, cred->euid);
758 ucred->gid = user_ns_map_gid(current_ns, cred, cred->egid);
759 }
760}
3924773a 761EXPORT_SYMBOL_GPL(cred_to_ucred);
3f551f94 762
1da177e4
LT		 763int sock_getsockopt(struct socket *sock, int level, int optname,
764 char __user *optval, int __user *optlen)
765{
766 struct sock *sk = sock->sk;
4ec93edb 767
e71a4783 768 union {
4ec93edb
YH		 769 int val;
770 struct linger ling;
1da177e4
LT		 771 struct timeval tm;
772 } v;
4ec93edb 773
4d0392be 774 int lv = sizeof(int);
1da177e4 775 int len;
4ec93edb 776
e71a4783 777 if (get_user(len, optlen))
4ec93edb 778 return -EFAULT;
e71a4783 779 if (len < 0)
1da177e4 780 return -EINVAL;
4ec93edb 781
50fee1de 782 memset(&v, 0, sizeof(v));
df0bca04 783
2a91525c 784 switch (optname) {
e71a4783
SH		 785 case SO_DEBUG:
786 v.val = sock_flag(sk, SOCK_DBG);
787 break;
788
789 case SO_DONTROUTE:
790 v.val = sock_flag(sk, SOCK_LOCALROUTE);
791 break;
792
793 case SO_BROADCAST:
794 v.val = !!sock_flag(sk, SOCK_BROADCAST);
795 break;
796
797 case SO_SNDBUF:
798 v.val = sk->sk_sndbuf;
799 break;
800
801 case SO_RCVBUF:
802 v.val = sk->sk_rcvbuf;
803 break;
804
805 case SO_REUSEADDR:
806 v.val = sk->sk_reuse;
807 break;
808
809 case SO_KEEPALIVE:
810 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
811 break;
812
813 case SO_TYPE:
814 v.val = sk->sk_type;
815 break;
816
49c794e9
JE		 817 case SO_PROTOCOL:
818 v.val = sk->sk_protocol;
819 break;
820
0d6038ee
JE		 821 case SO_DOMAIN:
822 v.val = sk->sk_family;
823 break;
824
e71a4783
SH		 825 case SO_ERROR:
826 v.val = -sock_error(sk);
2a91525c 827 if (v.val == 0)
e71a4783
SH		 828 v.val = xchg(&sk->sk_err_soft, 0);
829 break;
830
831 case SO_OOBINLINE:
832 v.val = !!sock_flag(sk, SOCK_URGINLINE);
833 break;
834
835 case SO_NO_CHECK:
836 v.val = sk->sk_no_check;
837 break;
838
839 case SO_PRIORITY:
840 v.val = sk->sk_priority;
841 break;
842
843 case SO_LINGER:
844 lv = sizeof(v.ling);
845 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
846 v.ling.l_linger = sk->sk_lingertime / HZ;
847 break;
848
849 case SO_BSDCOMPAT:
850 sock_warn_obsolete_bsdism("getsockopt");
851 break;
852
853 case SO_TIMESTAMP:
92f37fd2
ED		 854 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
855 !sock_flag(sk, SOCK_RCVTSTAMPNS);
856 break;
857
858 case SO_TIMESTAMPNS:
859 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 860 break;
861
20d49473
PO		 862 case SO_TIMESTAMPING:
863 v.val = 0;
864 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
865 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
866 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
867 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
868 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
869 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
870 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
871 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
872 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
873 v.val |= SOF_TIMESTAMPING_SOFTWARE;
874 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
875 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
876 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
877 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
878 break;
879
e71a4783 880 case SO_RCVTIMEO:
2a91525c 881 lv = sizeof(struct timeval);
e71a4783
SH		 882 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
883 v.tm.tv_sec = 0;
884 v.tm.tv_usec = 0;
885 } else {
886 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
887 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
888 }
889 break;
890
891 case SO_SNDTIMEO:
2a91525c 892 lv = sizeof(struct timeval);
e71a4783
SH		 893 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
894 v.tm.tv_sec = 0;
895 v.tm.tv_usec = 0;
896 } else {
897 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
898 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
899 }
900 break;
1da177e4 901
e71a4783
SH		 902 case SO_RCVLOWAT:
903 v.val = sk->sk_rcvlowat;
904 break;
1da177e4 905
e71a4783 906 case SO_SNDLOWAT:
2a91525c 907 v.val = 1;
e71a4783 908 break;
1da177e4 909
e71a4783
SH		 910 case SO_PASSCRED:
911 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
912 break;
1da177e4 913
e71a4783 914 case SO_PEERCRED:
109f6e39
EB		 915 {
916 struct ucred peercred;
917 if (len > sizeof(peercred))
918 len = sizeof(peercred);
919 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
920 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 921 return -EFAULT;
922 goto lenout;
109f6e39 923 }
1da177e4 924
e71a4783
SH		 925 case SO_PEERNAME:
926 {
927 char address[128];
928
929 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
930 return -ENOTCONN;
931 if (lv < len)
932 return -EINVAL;
933 if (copy_to_user(optval, address, len))
934 return -EFAULT;
935 goto lenout;
936 }
1da177e4 937
e71a4783
SH		 938 /* Dubious BSD thing... Probably nobody even uses it, but
939 * the UNIX standard wants it for whatever reason... -DaveM
940 */
941 case SO_ACCEPTCONN:
942 v.val = sk->sk_state == TCP_LISTEN;
943 break;
1da177e4 944
e71a4783
SH		 945 case SO_PASSSEC:
946 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
947 break;
877ce7c1 948
e71a4783
SH		 949 case SO_PEERSEC:
950 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 951
4a19ec58
LAT		 952 case SO_MARK:
953 v.val = sk->sk_mark;
954 break;
955
3b885787
NH		 956 case SO_RXQ_OVFL:
957 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
958 break;
959
e71a4783
SH		 960 default:
961 return -ENOPROTOOPT;
1da177e4 962 }
e71a4783 963
1da177e4
LT		 964 if (len > lv)
965 len = lv;
966 if (copy_to_user(optval, &v, len))
967 return -EFAULT;
968lenout:
4ec93edb
YH		 969 if (put_user(len, optlen))
970 return -EFAULT;
971 return 0;
1da177e4
LT		 972}
973
a5b5bb9a
IM		 974/*
975 * Initialize an sk_lock.
976 *
977 * (We also register the sk_lock with the lock validator.)
978 */
b6f99a21 979static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 980{
ed07536e
PZ		 981 sock_lock_init_class_and_name(sk,
982 af_family_slock_key_strings[sk->sk_family],
983 af_family_slock_keys + sk->sk_family,
984 af_family_key_strings[sk->sk_family],
985 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 986}
987
4dc6dc71
ED		 988/*
989 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
990 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 991 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 992 */
f1a6c4da
PE		 993static void sock_copy(struct sock *nsk, const struct sock *osk)
994{
995#ifdef CONFIG_SECURITY_NETWORK
996 void *sptr = nsk->sk_security;
997#endif
68835aba
ED		 998 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
999
1000 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1001 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1002
f1a6c4da
PE		 1003#ifdef CONFIG_SECURITY_NETWORK
1004 nsk->sk_security = sptr;
1005 security_sk_clone(osk, nsk);
1006#endif
1007}
1008
fcbdf09d
OP		 1009/*
1010 * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
1011 * un-modified. Special care is taken when initializing object to zero.
1012 */
1013static inline void sk_prot_clear_nulls(struct sock *sk, int size)
1014{
1015 if (offsetof(struct sock, sk_node.next) != 0)
1016 memset(sk, 0, offsetof(struct sock, sk_node.next));
1017 memset(&sk->sk_node.pprev, 0,
1018 size - offsetof(struct sock, sk_node.pprev));
1019}
1020
1021void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1022{
1023 unsigned long nulls1, nulls2;
1024
1025 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1026 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1027 if (nulls1 > nulls2)
1028 swap(nulls1, nulls2);
1029
1030 if (nulls1 != 0)
1031 memset((char *)sk, 0, nulls1);
1032 memset((char *)sk + nulls1 + sizeof(void *), 0,
1033 nulls2 - nulls1 - sizeof(void *));
1034 memset((char *)sk + nulls2 + sizeof(void *), 0,
1035 size - nulls2 - sizeof(void *));
1036}
1037EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1038
2e4afe7b
PE		 1039static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1040 int family)
c308c1b2
PE		 1041{
1042 struct sock *sk;
1043 struct kmem_cache *slab;
1044
1045 slab = prot->slab;
e912b114
ED		 1046 if (slab != NULL) {
1047 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1048 if (!sk)
1049 return sk;
1050 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1051 if (prot->clear_sk)
1052 prot->clear_sk(sk, prot->obj_size);
1053 else
1054 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1055 }
fcbdf09d 1056 } else
c308c1b2
PE		 1057 sk = kmalloc(prot->obj_size, priority);
1058
2e4afe7b 1059 if (sk != NULL) {
a98b65a3
VN		 1060 kmemcheck_annotate_bitfield(sk, flags);
1061
2e4afe7b
PE		 1062 if (security_sk_alloc(sk, family, priority))
1063 goto out_free;
1064
1065 if (!try_module_get(prot->owner))
1066 goto out_free_sec;
e022f0b4 1067 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1068 }
1069
c308c1b2 1070 return sk;
2e4afe7b
PE		 1071
1072out_free_sec:
1073 security_sk_free(sk);
1074out_free:
1075 if (slab != NULL)
1076 kmem_cache_free(slab, sk);
1077 else
1078 kfree(sk);
1079 return NULL;
c308c1b2
PE		 1080}
1081
1082static void sk_prot_free(struct proto *prot, struct sock *sk)
1083{
1084 struct kmem_cache *slab;
2e4afe7b 1085 struct module *owner;
c308c1b2 1086
2e4afe7b 1087 owner = prot->owner;
c308c1b2 1088 slab = prot->slab;
2e4afe7b
PE		 1089
1090 security_sk_free(sk);
c308c1b2
PE		 1091 if (slab != NULL)
1092 kmem_cache_free(slab, sk);
1093 else
1094 kfree(sk);
2e4afe7b 1095 module_put(owner);
c308c1b2
PE		 1096}
1097
f8451725
HX		 1098#ifdef CONFIG_CGROUPS
1099void sock_update_classid(struct sock *sk)
1100{
1144182a 1101 u32 classid;
f8451725 1102
1144182a
PM		 1103 rcu_read_lock(); /* doing current task, which cannot vanish. */
1104 classid = task_cls_classid(current);
1105 rcu_read_unlock();
f8451725
HX		 1106 if (classid && classid != sk->sk_classid)
1107 sk->sk_classid = classid;
1108}
82862742 1109EXPORT_SYMBOL(sock_update_classid);
f8451725
HX		 1110#endif
1111
1da177e4
LT		 1112/**
1113 * sk_alloc - All socket objects are allocated here
c4ea43c5 1114 * @net: the applicable net namespace
4dc3b16b
PP		 1115 * @family: protocol family
1116 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1117 * @prot: struct proto associated with this new sock instance
1da177e4 1118 */
1b8d7ae4 1119struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1120 struct proto *prot)
1da177e4 1121{
c308c1b2 1122 struct sock *sk;
1da177e4 1123
154adbc8 1124 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1125 if (sk) {
154adbc8
PE		 1126 sk->sk_family = family;
1127 /*
1128 * See comment in struct sock definition to understand
1129 * why we need sk_prot_creator -acme
1130 */
1131 sk->sk_prot = sk->sk_prot_creator = prot;
1132 sock_lock_init(sk);
3b1e0a65 1133 sock_net_set(sk, get_net(net));
d66ee058 1134 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725
HX		 1135
1136 sock_update_classid(sk);
1da177e4 1137 }
a79af59e 1138
2e4afe7b 1139 return sk;
1da177e4 1140}
2a91525c 1141EXPORT_SYMBOL(sk_alloc);
1da177e4 1142
2b85a34e 1143static void __sk_free(struct sock *sk)
1da177e4
LT		 1144{
1145 struct sk_filter *filter;
1da177e4
LT		 1146
1147 if (sk->sk_destruct)
1148 sk->sk_destruct(sk);
1149
a898def2
PM		 1150 filter = rcu_dereference_check(sk->sk_filter,
1151 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1152 if (filter) {
309dd5fc 1153 sk_filter_uncharge(sk, filter);
a9b3cd7f 1154 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1155 }
1156
20d49473
PO		 1157 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1158 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1da177e4
LT		 1159
1160 if (atomic_read(&sk->sk_omem_alloc))
1161 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 1162 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1163
109f6e39
EB		 1164 if (sk->sk_peer_cred)
1165 put_cred(sk->sk_peer_cred);
1166 put_pid(sk->sk_peer_pid);
3b1e0a65 1167 put_net(sock_net(sk));
c308c1b2 1168 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1169}
2b85a34e
ED		 1170
1171void sk_free(struct sock *sk)
1172{
1173 /*
25985edc 1174 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1175 * some packets are still in some tx queue.
1176 * If not null, sock_wfree() will call __sk_free(sk) later
1177 */
1178 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1179 __sk_free(sk);
1180}
2a91525c 1181EXPORT_SYMBOL(sk_free);
1da177e4 1182
edf02087 1183/*
25985edc
LDM		 1184 * Last sock_put should drop reference to sk->sk_net. It has already
1185 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1186 * is not an option.
25985edc 1187 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1188 * destroy it in the context of init_net.
1189 */
1190void sk_release_kernel(struct sock *sk)
1191{
1192 if (sk == NULL || sk->sk_socket == NULL)
1193 return;
1194
1195 sock_hold(sk);
1196 sock_release(sk->sk_socket);
65a18ec5 1197 release_net(sock_net(sk));
3b1e0a65 1198 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1199 sock_put(sk);
1200}
45af1754 1201EXPORT_SYMBOL(sk_release_kernel);
edf02087 1202
dd0fc66f 1203struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1204{
8fd1d178 1205 struct sock *newsk;
87d11ceb 1206
8fd1d178 1207 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1208 if (newsk != NULL) {
1209 struct sk_filter *filter;
1210
892c141e 1211 sock_copy(newsk, sk);
87d11ceb
ACM		 1212
1213 /* SANITY */
3b1e0a65 1214 get_net(sock_net(newsk));
87d11ceb
ACM		 1215 sk_node_init(&newsk->sk_node);
1216 sock_lock_init(newsk);
1217 bh_lock_sock(newsk);
fa438ccf 1218 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1219 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1220
1221 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1222 /*
1223 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1224 */
1225 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1226 atomic_set(&newsk->sk_omem_alloc, 0);
1227 skb_queue_head_init(&newsk->sk_receive_queue);
1228 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1229#ifdef CONFIG_NET_DMA
1230 skb_queue_head_init(&newsk->sk_async_wait_queue);
1231#endif
87d11ceb 1232
b6c6712a 1233 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1234 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1235 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1236 af_callback_keys + newsk->sk_family,
1237 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1238
1239 newsk->sk_dst_cache = NULL;
1240 newsk->sk_wmem_queued = 0;
1241 newsk->sk_forward_alloc = 0;
1242 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1243 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1244
1245 sock_reset_flag(newsk, SOCK_DONE);
1246 skb_queue_head_init(&newsk->sk_error_queue);
1247
0d7da9dd 1248 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb
ACM		 1249 if (filter != NULL)
1250 sk_filter_charge(newsk, filter);
1251
1252 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1253 /* It is still raw copy of parent, so invalidate
1254 * destructor and make plain sk_free() */
1255 newsk->sk_destruct = NULL;
b0691c8e 1256 bh_unlock_sock(newsk);
87d11ceb
ACM		 1257 sk_free(newsk);
1258 newsk = NULL;
1259 goto out;
1260 }
1261
1262 newsk->sk_err = 0;
1263 newsk->sk_priority = 0;
4dc6dc71
ED		 1264 /*
1265 * Before updating sk_refcnt, we must commit prior changes to memory
1266 * (Documentation/RCU/rculist_nulls.txt for details)
1267 */
1268 smp_wmb();
87d11ceb
ACM		 1269 atomic_set(&newsk->sk_refcnt, 2);
1270
1271 /*
1272 * Increment the counter in the same struct proto as the master
1273 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1274 * is the same as sk->sk_prot->socks, as this field was copied
1275 * with memcpy).
1276 *
1277 * This _changes_ the previous behaviour, where
1278 * tcp_create_openreq_child always was incrementing the
1279 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1280 * to be taken into account in all callers. -acme
1281 */
1282 sk_refcnt_debug_inc(newsk);
972692e0 1283 sk_set_socket(newsk, NULL);
43815482 1284 newsk->sk_wq = NULL;
87d11ceb
ACM		 1285
1286 if (newsk->sk_prot->sockets_allocated)
1748376b 1287 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
704da560
OP		 1288
1289 if (sock_flag(newsk, SOCK_TIMESTAMP) ||
1290 sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1291 net_enable_timestamp();
87d11ceb
ACM		 1292 }
1293out:
1294 return newsk;
1295}
87d11ceb
ACM		 1296EXPORT_SYMBOL_GPL(sk_clone);
1297
9958089a
AK		 1298void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1299{
1300 __sk_dst_set(sk, dst);
1301 sk->sk_route_caps = dst->dev->features;
1302 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1303 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1304 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1305 if (sk_can_gso(sk)) {
82cc1a7a 1306 if (dst->header_len) {
9958089a 1307 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1308 } else {
9958089a 1309 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1310 sk->sk_gso_max_size = dst->dev->gso_max_size;
1311 }
9958089a
AK		 1312 }
1313}
1314EXPORT_SYMBOL_GPL(sk_setup_caps);
1315
1da177e4
LT		 1316void __init sk_init(void)
1317{
4481374c 1318 if (totalram_pages <= 4096) {
1da177e4
LT		 1319 sysctl_wmem_max = 32767;
1320 sysctl_rmem_max = 32767;
1321 sysctl_wmem_default = 32767;
1322 sysctl_rmem_default = 32767;
4481374c 1323 } else if (totalram_pages >= 131072) {
1da177e4
LT		 1324 sysctl_wmem_max = 131071;
1325 sysctl_rmem_max = 131071;
1326 }
1327}
1328
1329/*
1330 * Simple resource managers for sockets.
1331 */
1332
1333
4ec93edb
YH		 1334/*
1335 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1336 */
1337void sock_wfree(struct sk_buff *skb)
1338{
1339 struct sock *sk = skb->sk;
d99927f4 1340 unsigned int len = skb->truesize;
1da177e4 1341
d99927f4
ED		 1342 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1343 /*
1344 * Keep a reference on sk_wmem_alloc, this will be released
1345 * after sk_write_space() call
1346 */
1347 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1348 sk->sk_write_space(sk);
d99927f4
ED		 1349 len = 1;
1350 }
2b85a34e 1351 /*
d99927f4
ED		 1352 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1353 * could not do because of in-flight packets
2b85a34e 1354 */
d99927f4 1355 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1356 __sk_free(sk);
1da177e4 1357}
2a91525c 1358EXPORT_SYMBOL(sock_wfree);
1da177e4 1359
4ec93edb
YH		 1360/*
1361 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1362 */
1363void sock_rfree(struct sk_buff *skb)
1364{
1365 struct sock *sk = skb->sk;
d361fd59 1366 unsigned int len = skb->truesize;
1da177e4 1367
d361fd59
ED		 1368 atomic_sub(len, &sk->sk_rmem_alloc);
1369 sk_mem_uncharge(sk, len);
1da177e4 1370}
2a91525c 1371EXPORT_SYMBOL(sock_rfree);
1da177e4
LT		 1372
1373
1374int sock_i_uid(struct sock *sk)
1375{
1376 int uid;
1377
f064af1e 1378 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1379 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
f064af1e 1380 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1381 return uid;
1382}
2a91525c 1383EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1384
1385unsigned long sock_i_ino(struct sock *sk)
1386{
1387 unsigned long ino;
1388
f064af1e 1389 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1390 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1391 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1392 return ino;
1393}
2a91525c 1394EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1395
1396/*
1397 * Allocate a skb from the socket's send buffer.
1398 */
86a76caf 1399struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1400 gfp_t priority)
1da177e4
LT		 1401{
1402 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1403 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1404 if (skb) {
1405 skb_set_owner_w(skb, sk);
1406 return skb;
1407 }
1408 }
1409 return NULL;
1410}
2a91525c 1411EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1412
1413/*
1414 * Allocate a skb from the socket's receive buffer.
4ec93edb 1415 */
86a76caf 1416struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1417 gfp_t priority)
1da177e4
LT		 1418{
1419 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1420 struct sk_buff *skb = alloc_skb(size, priority);
1421 if (skb) {
1422 skb_set_owner_r(skb, sk);
1423 return skb;
1424 }
1425 }
1426 return NULL;
1427}
1428
4ec93edb 1429/*
1da177e4 1430 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1431 */
dd0fc66f 1432void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1433{
1434 if ((unsigned)size <= sysctl_optmem_max &&
1435 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1436 void *mem;
1437 /* First do the add, to avoid the race if kmalloc
4ec93edb 1438 * might sleep.
1da177e4
LT		 1439 */
1440 atomic_add(size, &sk->sk_omem_alloc);
1441 mem = kmalloc(size, priority);
1442 if (mem)
1443 return mem;
1444 atomic_sub(size, &sk->sk_omem_alloc);
1445 }
1446 return NULL;
1447}
2a91525c 1448EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1449
1450/*
1451 * Free an option memory block.
1452 */
1453void sock_kfree_s(struct sock *sk, void *mem, int size)
1454{
1455 kfree(mem);
1456 atomic_sub(size, &sk->sk_omem_alloc);
1457}
2a91525c 1458EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1459
1460/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1461 I think, these locks should be removed for datagram sockets.
1462 */
2a91525c 1463static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1464{
1465 DEFINE_WAIT(wait);
1466
1467 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1468 for (;;) {
1469 if (!timeo)
1470 break;
1471 if (signal_pending(current))
1472 break;
1473 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1474 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1475 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1476 break;
1477 if (sk->sk_shutdown & SEND_SHUTDOWN)
1478 break;
1479 if (sk->sk_err)
1480 break;
1481 timeo = schedule_timeout(timeo);
1482 }
aa395145 1483 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1484 return timeo;
1485}
1486
1487
1488/*
1489 * Generic send/receive buffer handlers
1490 */
1491
4cc7f68d
HX		 1492struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1493 unsigned long data_len, int noblock,
1494 int *errcode)
1da177e4
LT		 1495{
1496 struct sk_buff *skb;
7d877f3b 1497 gfp_t gfp_mask;
1da177e4
LT		 1498 long timeo;
1499 int err;
1500
1501 gfp_mask = sk->sk_allocation;
1502 if (gfp_mask & __GFP_WAIT)
1503 gfp_mask |= __GFP_REPEAT;
1504
1505 timeo = sock_sndtimeo(sk, noblock);
1506 while (1) {
1507 err = sock_error(sk);
1508 if (err != 0)
1509 goto failure;
1510
1511 err = -EPIPE;
1512 if (sk->sk_shutdown & SEND_SHUTDOWN)
1513 goto failure;
1514
1515 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1516 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1517 if (skb) {
1518 int npages;
1519 int i;
1520
1521 /* No pages, we're done... */
1522 if (!data_len)
1523 break;
1524
1525 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1526 skb->truesize += data_len;
1527 skb_shinfo(skb)->nr_frags = npages;
1528 for (i = 0; i < npages; i++) {
1529 struct page *page;
1da177e4
LT		 1530
1531 page = alloc_pages(sk->sk_allocation, 0);
1532 if (!page) {
1533 err = -ENOBUFS;
1534 skb_shinfo(skb)->nr_frags = i;
1535 kfree_skb(skb);
1536 goto failure;
1537 }
1538
ea2ab693
IC		 1539 __skb_fill_page_desc(skb, i,
1540 page, 0,
1541 (data_len >= PAGE_SIZE ?
1542 PAGE_SIZE :
1543 data_len));
1da177e4
LT		 1544 data_len -= PAGE_SIZE;
1545 }
1546
1547 /* Full success... */
1548 break;
1549 }
1550 err = -ENOBUFS;
1551 goto failure;
1552 }
1553 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1554 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1555 err = -EAGAIN;
1556 if (!timeo)
1557 goto failure;
1558 if (signal_pending(current))
1559 goto interrupted;
1560 timeo = sock_wait_for_wmem(sk, timeo);
1561 }
1562
1563 skb_set_owner_w(skb, sk);
1564 return skb;
1565
1566interrupted:
1567 err = sock_intr_errno(timeo);
1568failure:
1569 *errcode = err;
1570 return NULL;
1571}
4cc7f68d 1572EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1573
4ec93edb 1574struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1575 int noblock, int *errcode)
1576{
1577 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1578}
2a91525c 1579EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4
LT		 1580
1581static void __lock_sock(struct sock *sk)
f39234d6
NK		 1582 __releases(&sk->sk_lock.slock)
1583 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1584{
1585 DEFINE_WAIT(wait);
1586
e71a4783 1587 for (;;) {
1da177e4
LT		 1588 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1589 TASK_UNINTERRUPTIBLE);
1590 spin_unlock_bh(&sk->sk_lock.slock);
1591 schedule();
1592 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1593 if (!sock_owned_by_user(sk))
1da177e4
LT		 1594 break;
1595 }
1596 finish_wait(&sk->sk_lock.wq, &wait);
1597}
1598
1599static void __release_sock(struct sock *sk)
f39234d6
NK		 1600 __releases(&sk->sk_lock.slock)
1601 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1602{
1603 struct sk_buff *skb = sk->sk_backlog.head;
1604
1605 do {
1606 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1607 bh_unlock_sock(sk);
1608
1609 do {
1610 struct sk_buff *next = skb->next;
1611
7fee226a 1612 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1613 skb->next = NULL;
c57943a1 1614 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1615
1616 /*
1617 * We are in process context here with softirqs
1618 * disabled, use cond_resched_softirq() to preempt.
1619 * This is safe to do because we've taken the backlog
1620 * queue private:
1621 */
1622 cond_resched_softirq();
1623
1624 skb = next;
1625 } while (skb != NULL);
1626
1627 bh_lock_sock(sk);
e71a4783 1628 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1629
1630 /*
1631 * Doing the zeroing here guarantee we can not loop forever
1632 * while a wild producer attempts to flood us.
1633 */
1634 sk->sk_backlog.len = 0;
1da177e4
LT		 1635}
1636
1637/**
1638 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1639 * @sk: sock to wait on
1640 * @timeo: for how long
1da177e4
LT		 1641 *
1642 * Now socket state including sk->sk_err is changed only under lock,
1643 * hence we may omit checks after joining wait queue.
1644 * We check receive queue before schedule() only as optimization;
1645 * it is very likely that release_sock() added new data.
1646 */
1647int sk_wait_data(struct sock *sk, long *timeo)
1648{
1649 int rc;
1650 DEFINE_WAIT(wait);
1651
aa395145 1652 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1653 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1654 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1655 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1656 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1657 return rc;
1658}
1da177e4
LT		 1659EXPORT_SYMBOL(sk_wait_data);
1660
3ab224be
HA		 1661/**
1662 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1663 * @sk: socket
1664 * @size: memory size to allocate
1665 * @kind: allocation type
1666 *
1667 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1668 * rmem allocation. This function assumes that protocols which have
1669 * memory_pressure use sk_wmem_queued as write buffer accounting.
1670 */
1671int __sk_mem_schedule(struct sock *sk, int size, int kind)
1672{
1673 struct proto *prot = sk->sk_prot;
1674 int amt = sk_mem_pages(size);
8d987e5c 1675 long allocated;
3ab224be
HA		 1676
1677 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
8d987e5c 1678 allocated = atomic_long_add_return(amt, prot->memory_allocated);
3ab224be
HA		 1679
1680 /* Under limit. */
1681 if (allocated <= prot->sysctl_mem[0]) {
1682 if (prot->memory_pressure && *prot->memory_pressure)
1683 *prot->memory_pressure = 0;
1684 return 1;
1685 }
1686
1687 /* Under pressure. */
1688 if (allocated > prot->sysctl_mem[1])
1689 if (prot->enter_memory_pressure)
5c52ba17 1690 prot->enter_memory_pressure(sk);
3ab224be
HA		 1691
1692 /* Over hard limit. */
1693 if (allocated > prot->sysctl_mem[2])
1694 goto suppress_allocation;
1695
1696 /* guarantee minimum buffer size under pressure */
1697 if (kind == SK_MEM_RECV) {
1698 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1699 return 1;
1700 } else { /* SK_MEM_SEND */
1701 if (sk->sk_type == SOCK_STREAM) {
1702 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1703 return 1;
1704 } else if (atomic_read(&sk->sk_wmem_alloc) <
1705 prot->sysctl_wmem[0])
1706 return 1;
1707 }
1708
1709 if (prot->memory_pressure) {
1748376b
ED		 1710 int alloc;
1711
1712 if (!*prot->memory_pressure)
1713 return 1;
1714 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1715 if (prot->sysctl_mem[2] > alloc *
3ab224be
HA		 1716 sk_mem_pages(sk->sk_wmem_queued +
1717 atomic_read(&sk->sk_rmem_alloc) +
1718 sk->sk_forward_alloc))
1719 return 1;
1720 }
1721
1722suppress_allocation:
1723
1724 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1725 sk_stream_moderate_sndbuf(sk);
1726
1727 /* Fail only if socket is _under_ its sndbuf.
1728 * In this case we cannot block, so that we have to fail.
1729 */
1730 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1731 return 1;
1732 }
1733
3847ce32
SM		 1734 trace_sock_exceed_buf_limit(sk, prot, allocated);
1735
3ab224be
HA		 1736 /* Alas. Undo changes. */
1737 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
8d987e5c 1738 atomic_long_sub(amt, prot->memory_allocated);
3ab224be
HA		 1739 return 0;
1740}
3ab224be
HA		 1741EXPORT_SYMBOL(__sk_mem_schedule);
1742
1743/**
1744 * __sk_reclaim - reclaim memory_allocated
1745 * @sk: socket
1746 */
1747void __sk_mem_reclaim(struct sock *sk)
1748{
1749 struct proto *prot = sk->sk_prot;
1750
8d987e5c 1751 atomic_long_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1752 prot->memory_allocated);
1753 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1754
1755 if (prot->memory_pressure && *prot->memory_pressure &&
8d987e5c 1756 (atomic_long_read(prot->memory_allocated) < prot->sysctl_mem[0]))
3ab224be
HA		 1757 *prot->memory_pressure = 0;
1758}
3ab224be
HA		 1759EXPORT_SYMBOL(__sk_mem_reclaim);
1760
1761
1da177e4
LT		 1762/*
1763 * Set of default routines for initialising struct proto_ops when
1764 * the protocol does not support a particular function. In certain
1765 * cases where it makes no sense for a protocol to have a "do nothing"
1766 * function, some default processing is provided.
1767 */
1768
1769int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1770{
1771 return -EOPNOTSUPP;
1772}
2a91525c 1773EXPORT_SYMBOL(sock_no_bind);
1da177e4 1774
4ec93edb 1775int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1776 int len, int flags)
1777{
1778 return -EOPNOTSUPP;
1779}
2a91525c 1780EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 1781
1782int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1783{
1784 return -EOPNOTSUPP;
1785}
2a91525c 1786EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 1787
1788int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1789{
1790 return -EOPNOTSUPP;
1791}
2a91525c 1792EXPORT_SYMBOL(sock_no_accept);
1da177e4 1793
4ec93edb 1794int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1795 int *len, int peer)
1796{
1797 return -EOPNOTSUPP;
1798}
2a91525c 1799EXPORT_SYMBOL(sock_no_getname);
1da177e4 1800
2a91525c 1801unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 1802{
1803 return 0;
1804}
2a91525c 1805EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 1806
1807int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1808{
1809 return -EOPNOTSUPP;
1810}
2a91525c 1811EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 1812
1813int sock_no_listen(struct socket *sock, int backlog)
1814{
1815 return -EOPNOTSUPP;
1816}
2a91525c 1817EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 1818
1819int sock_no_shutdown(struct socket *sock, int how)
1820{
1821 return -EOPNOTSUPP;
1822}
2a91525c 1823EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 1824
1825int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 1826 char __user *optval, unsigned int optlen)
1da177e4
LT		 1827{
1828 return -EOPNOTSUPP;
1829}
2a91525c 1830EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 1831
1832int sock_no_getsockopt(struct socket *sock, int level, int optname,
1833 char __user *optval, int __user *optlen)
1834{
1835 return -EOPNOTSUPP;
1836}
2a91525c 1837EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 1838
1839int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1840 size_t len)
1841{
1842 return -EOPNOTSUPP;
1843}
2a91525c 1844EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 1845
1846int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1847 size_t len, int flags)
1848{
1849 return -EOPNOTSUPP;
1850}
2a91525c 1851EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 1852
1853int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1854{
1855 /* Mirror missing mmap method error code */
1856 return -ENODEV;
1857}
2a91525c 1858EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 1859
1860ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1861{
1862 ssize_t res;
1863 struct msghdr msg = {.msg_flags = flags};
1864 struct kvec iov;
1865 char *kaddr = kmap(page);
1866 iov.iov_base = kaddr + offset;
1867 iov.iov_len = size;
1868 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1869 kunmap(page);
1870 return res;
1871}
2a91525c 1872EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 1873
1874/*
1875 * Default Socket Callbacks
1876 */
1877
1878static void sock_def_wakeup(struct sock *sk)
1879{
43815482
ED		 1880 struct socket_wq *wq;
1881
1882 rcu_read_lock();
1883 wq = rcu_dereference(sk->sk_wq);
1884 if (wq_has_sleeper(wq))
1885 wake_up_interruptible_all(&wq->wait);
1886 rcu_read_unlock();
1da177e4
LT		 1887}
1888
1889static void sock_def_error_report(struct sock *sk)
1890{
43815482
ED		 1891 struct socket_wq *wq;
1892
1893 rcu_read_lock();
1894 wq = rcu_dereference(sk->sk_wq);
1895 if (wq_has_sleeper(wq))
1896 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 1897 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 1898 rcu_read_unlock();
1da177e4
LT		 1899}
1900
1901static void sock_def_readable(struct sock *sk, int len)
1902{
43815482
ED		 1903 struct socket_wq *wq;
1904
1905 rcu_read_lock();
1906 wq = rcu_dereference(sk->sk_wq);
1907 if (wq_has_sleeper(wq))
2c6607c6 1908 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 1909 POLLRDNORM | POLLRDBAND);
8d8ad9d7 1910 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 1911 rcu_read_unlock();
1da177e4
LT		 1912}
1913
1914static void sock_def_write_space(struct sock *sk)
1915{
43815482
ED		 1916 struct socket_wq *wq;
1917
1918 rcu_read_lock();
1da177e4
LT		 1919
1920 /* Do not wake up a writer until he can make "significant"
1921 * progress. --DaveM
1922 */
e71a4783 1923 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 1924 wq = rcu_dereference(sk->sk_wq);
1925 if (wq_has_sleeper(wq))
1926 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 1927 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 1928
1929 /* Should agree with poll, otherwise some programs break */
1930 if (sock_writeable(sk))
8d8ad9d7 1931 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1932 }
1933
43815482 1934 rcu_read_unlock();
1da177e4
LT		 1935}
1936
1937static void sock_def_destruct(struct sock *sk)
1938{
a51482bd 1939 kfree(sk->sk_protinfo);
1da177e4
LT		 1940}
1941
1942void sk_send_sigurg(struct sock *sk)
1943{
1944 if (sk->sk_socket && sk->sk_socket->file)
1945 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1946 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 1947}
2a91525c 1948EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 1949
1950void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1951 unsigned long expires)
1952{
1953 if (!mod_timer(timer, expires))
1954 sock_hold(sk);
1955}
1da177e4
LT		 1956EXPORT_SYMBOL(sk_reset_timer);
1957
1958void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1959{
1960 if (timer_pending(timer) && del_timer(timer))
1961 __sock_put(sk);
1962}
1da177e4
LT		 1963EXPORT_SYMBOL(sk_stop_timer);
1964
1965void sock_init_data(struct socket *sock, struct sock *sk)
1966{
1967 skb_queue_head_init(&sk->sk_receive_queue);
1968 skb_queue_head_init(&sk->sk_write_queue);
1969 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1970#ifdef CONFIG_NET_DMA
1971 skb_queue_head_init(&sk->sk_async_wait_queue);
1972#endif
1da177e4
LT		 1973
1974 sk->sk_send_head = NULL;
1975
1976 init_timer(&sk->sk_timer);
4ec93edb 1977
1da177e4
LT		 1978 sk->sk_allocation = GFP_KERNEL;
1979 sk->sk_rcvbuf = sysctl_rmem_default;
1980 sk->sk_sndbuf = sysctl_wmem_default;
1981 sk->sk_state = TCP_CLOSE;
972692e0 1982 sk_set_socket(sk, sock);
1da177e4
LT		 1983
1984 sock_set_flag(sk, SOCK_ZAPPED);
1985
e71a4783 1986 if (sock) {
1da177e4 1987 sk->sk_type = sock->type;
43815482 1988 sk->sk_wq = sock->wq;
1da177e4
LT		 1989 sock->sk = sk;
1990 } else
43815482 1991 sk->sk_wq = NULL;
1da177e4 1992
b6c6712a 1993 spin_lock_init(&sk->sk_dst_lock);
1da177e4 1994 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1995 lockdep_set_class_and_name(&sk->sk_callback_lock,
1996 af_callback_keys + sk->sk_family,
1997 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1998
1999 sk->sk_state_change = sock_def_wakeup;
2000 sk->sk_data_ready = sock_def_readable;
2001 sk->sk_write_space = sock_def_write_space;
2002 sk->sk_error_report = sock_def_error_report;
2003 sk->sk_destruct = sock_def_destruct;
2004
2005 sk->sk_sndmsg_page = NULL;
2006 sk->sk_sndmsg_off = 0;
2007
109f6e39
EB		 2008 sk->sk_peer_pid = NULL;
2009 sk->sk_peer_cred = NULL;
1da177e4
LT		 2010 sk->sk_write_pending = 0;
2011 sk->sk_rcvlowat = 1;
2012 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2013 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2014
f37f0afb 2015 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2016
4dc6dc71
ED		 2017 /*
2018 * Before updating sk_refcnt, we must commit prior changes to memory
2019 * (Documentation/RCU/rculist_nulls.txt for details)
2020 */
2021 smp_wmb();
1da177e4 2022 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2023 atomic_set(&sk->sk_drops, 0);
1da177e4 2024}
2a91525c 2025EXPORT_SYMBOL(sock_init_data);
1da177e4 2026
b5606c2d 2027void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2028{
2029 might_sleep();
a5b5bb9a 2030 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2031 if (sk->sk_lock.owned)
1da177e4 2032 __lock_sock(sk);
d2e9117c 2033 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2034 spin_unlock(&sk->sk_lock.slock);
2035 /*
2036 * The sk_lock has mutex_lock() semantics here:
2037 */
fcc70d5f 2038 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2039 local_bh_enable();
1da177e4 2040}
fcc70d5f 2041EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2042
b5606c2d 2043void release_sock(struct sock *sk)
1da177e4 2044{
a5b5bb9a
IM		 2045 /*
2046 * The sk_lock has mutex_unlock() semantics:
2047 */
2048 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2049
2050 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2051 if (sk->sk_backlog.tail)
2052 __release_sock(sk);
d2e9117c 2053 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 2054 if (waitqueue_active(&sk->sk_lock.wq))
2055 wake_up(&sk->sk_lock.wq);
2056 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2057}
2058EXPORT_SYMBOL(release_sock);
2059
8a74ad60
ED		 2060/**
2061 * lock_sock_fast - fast version of lock_sock
2062 * @sk: socket
2063 *
2064 * This version should be used for very small section, where process wont block
2065 * return false if fast path is taken
2066 * sk_lock.slock locked, owned = 0, BH disabled
2067 * return true if slow path is taken
2068 * sk_lock.slock unlocked, owned = 1, BH enabled
2069 */
2070bool lock_sock_fast(struct sock *sk)
2071{
2072 might_sleep();
2073 spin_lock_bh(&sk->sk_lock.slock);
2074
2075 if (!sk->sk_lock.owned)
2076 /*
2077 * Note : We must disable BH
2078 */
2079 return false;
2080
2081 __lock_sock(sk);
2082 sk->sk_lock.owned = 1;
2083 spin_unlock(&sk->sk_lock.slock);
2084 /*
2085 * The sk_lock has mutex_lock() semantics here:
2086 */
2087 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2088 local_bh_enable();
2089 return true;
2090}
2091EXPORT_SYMBOL(lock_sock_fast);
2092
1da177e4 2093int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2094{
b7aa0bf7 2095 struct timeval tv;
1da177e4 2096 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2097 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2098 tv = ktime_to_timeval(sk->sk_stamp);
2099 if (tv.tv_sec == -1)
1da177e4 2100 return -ENOENT;
b7aa0bf7
ED		 2101 if (tv.tv_sec == 0) {
2102 sk->sk_stamp = ktime_get_real();
2103 tv = ktime_to_timeval(sk->sk_stamp);
2104 }
2105 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2106}
1da177e4
LT		 2107EXPORT_SYMBOL(sock_get_timestamp);
2108
ae40eb1e
ED		 2109int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2110{
2111 struct timespec ts;
2112 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2113 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2114 ts = ktime_to_timespec(sk->sk_stamp);
2115 if (ts.tv_sec == -1)
2116 return -ENOENT;
2117 if (ts.tv_sec == 0) {
2118 sk->sk_stamp = ktime_get_real();
2119 ts = ktime_to_timespec(sk->sk_stamp);
2120 }
2121 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2122}
2123EXPORT_SYMBOL(sock_get_timestampns);
2124
20d49473 2125void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2126{
20d49473
PO		 2127 if (!sock_flag(sk, flag)) {
2128 sock_set_flag(sk, flag);
2129 /*
2130 * we just set one of the two flags which require net
2131 * time stamping, but time stamping might have been on
2132 * already because of the other one
2133 */
2134 if (!sock_flag(sk,
2135 flag == SOCK_TIMESTAMP ?
2136 SOCK_TIMESTAMPING_RX_SOFTWARE :
2137 SOCK_TIMESTAMP))
2138 net_enable_timestamp();
1da177e4
LT		 2139 }
2140}
1da177e4
LT		 2141
2142/*
2143 * Get a socket option on an socket.
2144 *
2145 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2146 * asynchronous errors should be reported by getsockopt. We assume
2147 * this means if you specify SO_ERROR (otherwise whats the point of it).
2148 */
2149int sock_common_getsockopt(struct socket *sock, int level, int optname,
2150 char __user *optval, int __user *optlen)
2151{
2152 struct sock *sk = sock->sk;
2153
2154 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2155}
1da177e4
LT		 2156EXPORT_SYMBOL(sock_common_getsockopt);
2157
3fdadf7d 2158#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2159int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2160 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2161{
2162 struct sock *sk = sock->sk;
2163
1e51f951 2164 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2165 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2166 optval, optlen);
3fdadf7d
DM		 2167 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2168}
2169EXPORT_SYMBOL(compat_sock_common_getsockopt);
2170#endif
2171
1da177e4
LT		 2172int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2173 struct msghdr *msg, size_t size, int flags)
2174{
2175 struct sock *sk = sock->sk;
2176 int addr_len = 0;
2177 int err;
2178
2179 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2180 flags & ~MSG_DONTWAIT, &addr_len);
2181 if (err >= 0)
2182 msg->msg_namelen = addr_len;
2183 return err;
2184}
1da177e4
LT		 2185EXPORT_SYMBOL(sock_common_recvmsg);
2186
2187/*
2188 * Set socket options on an inet socket.
2189 */
2190int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2191 char __user *optval, unsigned int optlen)
1da177e4
LT		 2192{
2193 struct sock *sk = sock->sk;
2194
2195 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2196}
1da177e4
LT		 2197EXPORT_SYMBOL(sock_common_setsockopt);
2198
3fdadf7d 2199#ifdef CONFIG_COMPAT
543d9cfe 2200int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2201 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2202{
2203 struct sock *sk = sock->sk;
2204
543d9cfe
ACM		 2205 if (sk->sk_prot->compat_setsockopt != NULL)
2206 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2207 optval, optlen);
3fdadf7d
DM		 2208 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2209}
2210EXPORT_SYMBOL(compat_sock_common_setsockopt);
2211#endif
2212
1da177e4
LT		 2213void sk_common_release(struct sock *sk)
2214{
2215 if (sk->sk_prot->destroy)
2216 sk->sk_prot->destroy(sk);
2217
2218 /*
2219 * Observation: when sock_common_release is called, processes have
2220 * no access to socket. But net still has.
2221 * Step one, detach it from networking:
2222 *
2223 * A. Remove from hash tables.
2224 */
2225
2226 sk->sk_prot->unhash(sk);
2227
2228 /*
2229 * In this point socket cannot receive new packets, but it is possible
2230 * that some packets are in flight because some CPU runs receiver and
2231 * did hash table lookup before we unhashed socket. They will achieve
2232 * receive queue and will be purged by socket destructor.
2233 *
2234 * Also we still have packets pending on receive queue and probably,
2235 * our own packets waiting in device queues. sock_destroy will drain
2236 * receive queue, but transmitted packets will delay socket destruction
2237 * until the last reference will be released.
2238 */
2239
2240 sock_orphan(sk);
2241
2242 xfrm_sk_free_policy(sk);
2243
e6848976 2244 sk_refcnt_debug_release(sk);
1da177e4
LT		 2245 sock_put(sk);
2246}
1da177e4
LT		 2247EXPORT_SYMBOL(sk_common_release);
2248
2249static DEFINE_RWLOCK(proto_list_lock);
2250static LIST_HEAD(proto_list);
2251
13ff3d6f
PE		 2252#ifdef CONFIG_PROC_FS
2253#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2254struct prot_inuse {
2255 int val[PROTO_INUSE_NR];
2256};
13ff3d6f
PE		 2257
2258static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2259
2260#ifdef CONFIG_NET_NS
2261void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2262{
d6d9ca0f 2263 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2264}
2265EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2266
2267int sock_prot_inuse_get(struct net *net, struct proto *prot)
2268{
2269 int cpu, idx = prot->inuse_idx;
2270 int res = 0;
2271
2272 for_each_possible_cpu(cpu)
2273 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2274
2275 return res >= 0 ? res : 0;
2276}
2277EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2278
2c8c1e72 2279static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2280{
2281 net->core.inuse = alloc_percpu(struct prot_inuse);
2282 return net->core.inuse ? 0 : -ENOMEM;
2283}
2284
2c8c1e72 2285static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2286{
2287 free_percpu(net->core.inuse);
2288}
2289
2290static struct pernet_operations net_inuse_ops = {
2291 .init = sock_inuse_init_net,
2292 .exit = sock_inuse_exit_net,
2293};
2294
2295static __init int net_inuse_init(void)
2296{
2297 if (register_pernet_subsys(&net_inuse_ops))
2298 panic("Cannot initialize net inuse counters");
2299
2300 return 0;
2301}
2302
2303core_initcall(net_inuse_init);
2304#else
1338d466
PE		 2305static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2306
c29a0bc4 2307void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2308{
d6d9ca0f 2309 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2310}
2311EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2312
c29a0bc4 2313int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2314{
2315 int cpu, idx = prot->inuse_idx;
2316 int res = 0;
2317
2318 for_each_possible_cpu(cpu)
2319 res += per_cpu(prot_inuse, cpu).val[idx];
2320
2321 return res >= 0 ? res : 0;
2322}
2323EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2324#endif
13ff3d6f
PE		 2325
2326static void assign_proto_idx(struct proto *prot)
2327{
2328 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2329
2330 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2331 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2332 return;
2333 }
2334
2335 set_bit(prot->inuse_idx, proto_inuse_idx);
2336}
2337
2338static void release_proto_idx(struct proto *prot)
2339{
2340 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2341 clear_bit(prot->inuse_idx, proto_inuse_idx);
2342}
2343#else
2344static inline void assign_proto_idx(struct proto *prot)
2345{
2346}
2347
2348static inline void release_proto_idx(struct proto *prot)
2349{
2350}
2351#endif
2352
b733c007
PE		 2353int proto_register(struct proto *prot, int alloc_slab)
2354{
1da177e4
LT		 2355 if (alloc_slab) {
2356 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2357 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2358 NULL);
1da177e4
LT		 2359
2360 if (prot->slab == NULL) {
2361 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2362 prot->name);
60e7663d 2363 goto out;
1da177e4 2364 }
2e6599cb
ACM		 2365
2366 if (prot->rsk_prot != NULL) {
faf23422 2367 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2368 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2369 goto out_free_sock_slab;
2370
7e56b5d6 2371 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2372 prot->rsk_prot->obj_size, 0,
20c2df83 2373 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2374
2375 if (prot->rsk_prot->slab == NULL) {
2376 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2377 prot->name);
2378 goto out_free_request_sock_slab_name;
2379 }
2380 }
8feaf0c0 2381
6d6ee43e 2382 if (prot->twsk_prot != NULL) {
faf23422 2383 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2384
7e56b5d6 2385 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2386 goto out_free_request_sock_slab;
2387
6d6ee43e 2388 prot->twsk_prot->twsk_slab =
7e56b5d6 2389 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2390 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2391 0,
2392 SLAB_HWCACHE_ALIGN |
2393 prot->slab_flags,
20c2df83 2394 NULL);
6d6ee43e 2395 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2396 goto out_free_timewait_sock_slab_name;
2397 }
1da177e4
LT		 2398 }
2399
2a278051 2400 write_lock(&proto_list_lock);
1da177e4 2401 list_add(&prot->node, &proto_list);
13ff3d6f 2402 assign_proto_idx(prot);
1da177e4 2403 write_unlock(&proto_list_lock);
b733c007
PE		 2404 return 0;
2405
8feaf0c0 2406out_free_timewait_sock_slab_name:
7e56b5d6 2407 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2408out_free_request_sock_slab:
2409 if (prot->rsk_prot && prot->rsk_prot->slab) {
2410 kmem_cache_destroy(prot->rsk_prot->slab);
2411 prot->rsk_prot->slab = NULL;
2412 }
2e6599cb 2413out_free_request_sock_slab_name:
72150e9b
DC		 2414 if (prot->rsk_prot)
2415 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2416out_free_sock_slab:
2417 kmem_cache_destroy(prot->slab);
2418 prot->slab = NULL;
b733c007
PE		 2419out:
2420 return -ENOBUFS;
1da177e4 2421}
1da177e4
LT		 2422EXPORT_SYMBOL(proto_register);
2423
2424void proto_unregister(struct proto *prot)
2425{
2426 write_lock(&proto_list_lock);
13ff3d6f 2427 release_proto_idx(prot);
0a3f4358
PM		 2428 list_del(&prot->node);
2429 write_unlock(&proto_list_lock);
1da177e4
LT		 2430
2431 if (prot->slab != NULL) {
2432 kmem_cache_destroy(prot->slab);
2433 prot->slab = NULL;
2434 }
2435
2e6599cb 2436 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2437 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2438 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2439 prot->rsk_prot->slab = NULL;
2440 }
2441
6d6ee43e 2442 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2443 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2444 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2445 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2446 }
1da177e4 2447}
1da177e4
LT		 2448EXPORT_SYMBOL(proto_unregister);
2449
2450#ifdef CONFIG_PROC_FS
1da177e4 2451static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2452 __acquires(proto_list_lock)
1da177e4
LT		 2453{
2454 read_lock(&proto_list_lock);
60f0438a 2455 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2456}
2457
2458static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2459{
60f0438a 2460 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2461}
2462
2463static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2464 __releases(proto_list_lock)
1da177e4
LT		 2465{
2466 read_unlock(&proto_list_lock);
2467}
2468
2469static char proto_method_implemented(const void *method)
2470{
2471 return method == NULL ? 'n' : 'y';
2472}
2473
2474static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2475{
8d987e5c 2476 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2477 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2478 proto->name,
2479 proto->obj_size,
14e943db 2480 sock_prot_inuse_get(seq_file_net(seq), proto),
8d987e5c 2481 proto->memory_allocated != NULL ? atomic_long_read(proto->memory_allocated) : -1L,
1da177e4
LT		 2482 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2483 proto->max_header,
2484 proto->slab == NULL ? "no" : "yes",
2485 module_name(proto->owner),
2486 proto_method_implemented(proto->close),
2487 proto_method_implemented(proto->connect),
2488 proto_method_implemented(proto->disconnect),
2489 proto_method_implemented(proto->accept),
2490 proto_method_implemented(proto->ioctl),
2491 proto_method_implemented(proto->init),
2492 proto_method_implemented(proto->destroy),
2493 proto_method_implemented(proto->shutdown),
2494 proto_method_implemented(proto->setsockopt),
2495 proto_method_implemented(proto->getsockopt),
2496 proto_method_implemented(proto->sendmsg),
2497 proto_method_implemented(proto->recvmsg),
2498 proto_method_implemented(proto->sendpage),
2499 proto_method_implemented(proto->bind),
2500 proto_method_implemented(proto->backlog_rcv),
2501 proto_method_implemented(proto->hash),
2502 proto_method_implemented(proto->unhash),
2503 proto_method_implemented(proto->get_port),
2504 proto_method_implemented(proto->enter_memory_pressure));
2505}
2506
2507static int proto_seq_show(struct seq_file *seq, void *v)
2508{
60f0438a 2509 if (v == &proto_list)
1da177e4
LT		 2510 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2511 "protocol",
2512 "size",
2513 "sockets",
2514 "memory",
2515 "press",
2516 "maxhdr",
2517 "slab",
2518 "module",
2519 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2520 else
60f0438a 2521 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2522 return 0;
2523}
2524
f690808e 2525static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2526 .start = proto_seq_start,
2527 .next = proto_seq_next,
2528 .stop = proto_seq_stop,
2529 .show = proto_seq_show,
2530};
2531
2532static int proto_seq_open(struct inode *inode, struct file *file)
2533{
14e943db
ED		 2534 return seq_open_net(inode, file, &proto_seq_ops,
2535 sizeof(struct seq_net_private));
1da177e4
LT		 2536}
2537
9a32144e 2538static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2539 .owner = THIS_MODULE,
2540 .open = proto_seq_open,
2541 .read = seq_read,
2542 .llseek = seq_lseek,
14e943db
ED		 2543 .release = seq_release_net,
2544};
2545
2546static __net_init int proto_init_net(struct net *net)
2547{
2548 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2549 return -ENOMEM;
2550
2551 return 0;
2552}
2553
2554static __net_exit void proto_exit_net(struct net *net)
2555{
2556 proc_net_remove(net, "protocols");
2557}
2558
2559
2560static __net_initdata struct pernet_operations proto_net_ops = {
2561 .init = proto_init_net,
2562 .exit = proto_exit_net,
1da177e4
LT		 2563};
2564
2565static int __init proto_init(void)
2566{
14e943db 2567 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2568}
2569
2570subsys_initcall(proto_init);
2571
2572#endif /* PROC_FS */
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