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net: introduce netif_addr_lock_nested() and call if when appropriate
[deliverable/linux.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
4fc268d2 92#include <linux/capability.h>
1da177e4
LT		 93#include <linux/errno.h>
94#include <linux/types.h>
95#include <linux/socket.h>
96#include <linux/in.h>
97#include <linux/kernel.h>
1da177e4
LT		 98#include <linux/module.h>
99#include <linux/proc_fs.h>
100#include <linux/seq_file.h>
101#include <linux/sched.h>
102#include <linux/timer.h>
103#include <linux/string.h>
104#include <linux/sockios.h>
105#include <linux/net.h>
106#include <linux/mm.h>
107#include <linux/slab.h>
108#include <linux/interrupt.h>
109#include <linux/poll.h>
110#include <linux/tcp.h>
111#include <linux/init.h>
a1f8e7f7 112#include <linux/highmem.h>
3f551f94 113#include <linux/user_namespace.h>
e1aab161 114#include <linux/jump_label.h>
1da177e4
LT		 115
116#include <asm/uaccess.h>
117#include <asm/system.h>
118
119#include <linux/netdevice.h>
120#include <net/protocol.h>
121#include <linux/skbuff.h>
457c4cbc 122#include <net/net_namespace.h>
2e6599cb 123#include <net/request_sock.h>
1da177e4 124#include <net/sock.h>
20d49473 125#include <linux/net_tstamp.h>
1da177e4
LT		 126#include <net/xfrm.h>
127#include <linux/ipsec.h>
f8451725 128#include <net/cls_cgroup.h>
5bc1421e 129#include <net/netprio_cgroup.h>
1da177e4
LT		 130
131#include <linux/filter.h>
132
3847ce32
SM		 133#include <trace/events/sock.h>
134
1da177e4
LT		 135#ifdef CONFIG_INET
136#include <net/tcp.h>
137#endif
138
36b77a52 139static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 140static LIST_HEAD(proto_list);
141
142#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
143int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss)
144{
145 struct proto *proto;
146 int ret = 0;
147
36b77a52 148 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 149 list_for_each_entry(proto, &proto_list, node) {
150 if (proto->init_cgroup) {
151 ret = proto->init_cgroup(cgrp, ss);
152 if (ret)
153 goto out;
154 }
155 }
156
36b77a52 157 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 158 return ret;
159out:
160 list_for_each_entry_continue_reverse(proto, &proto_list, node)
161 if (proto->destroy_cgroup)
162 proto->destroy_cgroup(cgrp, ss);
36b77a52 163 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 164 return ret;
165}
166
167void mem_cgroup_sockets_destroy(struct cgroup *cgrp, struct cgroup_subsys *ss)
168{
169 struct proto *proto;
170
36b77a52 171 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 172 list_for_each_entry_reverse(proto, &proto_list, node)
173 if (proto->destroy_cgroup)
174 proto->destroy_cgroup(cgrp, ss);
36b77a52 175 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 176}
177#endif
178
da21f24d
IM		 179/*
180 * Each address family might have different locking rules, so we have
181 * one slock key per address family:
182 */
a5b5bb9a
IM		 183static struct lock_class_key af_family_keys[AF_MAX];
184static struct lock_class_key af_family_slock_keys[AF_MAX];
185
e1aab161
GC		 186struct jump_label_key memcg_socket_limit_enabled;
187EXPORT_SYMBOL(memcg_socket_limit_enabled);
188
a5b5bb9a
IM		 189/*
190 * Make lock validator output more readable. (we pre-construct these
191 * strings build-time, so that runtime initialization of socket
192 * locks is fast):
193 */
36cbd3dc 194static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 195 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
196 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
197 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
198 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
199 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
200 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
201 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 202 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 203 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 204 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 205 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 206 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 207 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
c7fe3b52 208 "sk_lock-AF_NFC" , "sk_lock-AF_MAX"
a5b5bb9a 209};
36cbd3dc 210static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 211 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
212 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
213 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
214 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
215 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
216 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
217 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 218 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 219 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 220 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 221 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 222 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 223 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
c7fe3b52 224 "slock-AF_NFC" , "slock-AF_MAX"
a5b5bb9a 225};
36cbd3dc 226static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 227 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
228 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
229 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
230 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
231 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
232 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
233 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 234 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 235 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 236 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 237 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 238 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 239 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
c7fe3b52 240 "clock-AF_NFC" , "clock-AF_MAX"
443aef0e 241};
da21f24d
IM		 242
243/*
244 * sk_callback_lock locking rules are per-address-family,
245 * so split the lock classes by using a per-AF key:
246 */
247static struct lock_class_key af_callback_keys[AF_MAX];
248
1da177e4
LT		 249/* Take into consideration the size of the struct sk_buff overhead in the
250 * determination of these values, since that is non-constant across
251 * platforms. This makes socket queueing behavior and performance
252 * not depend upon such differences.
253 */
254#define _SK_MEM_PACKETS 256
87fb4b7b 255#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 256#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
257#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
258
259/* Run time adjustable parameters. */
ab32ea5d
BH		 260__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
261__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
262__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
263__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 264
25985edc 265/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 266int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 267EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 268
5bc1421e
NH		 269#if defined(CONFIG_CGROUPS)
270#if !defined(CONFIG_NET_CLS_CGROUP)
f8451725
HX		 271int net_cls_subsys_id = -1;
272EXPORT_SYMBOL_GPL(net_cls_subsys_id);
273#endif
5bc1421e
NH		 274#if !defined(CONFIG_NETPRIO_CGROUP)
275int net_prio_subsys_id = -1;
276EXPORT_SYMBOL_GPL(net_prio_subsys_id);
277#endif
278#endif
f8451725 279
1da177e4
LT		 280static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
281{
282 struct timeval tv;
283
284 if (optlen < sizeof(tv))
285 return -EINVAL;
286 if (copy_from_user(&tv, optval, sizeof(tv)))
287 return -EFAULT;
ba78073e
VA		 288 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
289 return -EDOM;
1da177e4 290
ba78073e 291 if (tv.tv_sec < 0) {
6f11df83
AM		 292 static int warned __read_mostly;
293
ba78073e 294 *timeo_p = 0;
50aab54f 295 if (warned < 10 && net_ratelimit()) {
ba78073e
VA		 296 warned++;
297 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
298 "tries to set negative timeout\n",
ba25f9dc 299 current->comm, task_pid_nr(current));
50aab54f 300 }
ba78073e
VA		 301 return 0;
302 }
1da177e4
LT		 303 *timeo_p = MAX_SCHEDULE_TIMEOUT;
304 if (tv.tv_sec == 0 && tv.tv_usec == 0)
305 return 0;
306 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
307 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
308 return 0;
309}
310
311static void sock_warn_obsolete_bsdism(const char *name)
312{
313 static int warned;
314 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 315 if (strcmp(warncomm, current->comm) && warned < 5) {
316 strcpy(warncomm, current->comm);
1da177e4
LT		 317 printk(KERN_WARNING "process `%s' is using obsolete "
318 "%s SO_BSDCOMPAT\n", warncomm, name);
319 warned++;
320 }
321}
322
08e29af3
ED		 323#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
324
325static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 326{
08e29af3
ED		 327 if (sk->sk_flags & flags) {
328 sk->sk_flags &= ~flags;
329 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 330 net_disable_timestamp();
1da177e4
LT		 331 }
332}
333
334
f0088a50
DV		 335int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
336{
766e9037 337 int err;
f0088a50 338 int skb_len;
3b885787
NH		 339 unsigned long flags;
340 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 341
0fd7bac6 342 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 343 atomic_inc(&sk->sk_drops);
3847ce32 344 trace_sock_rcvqueue_full(sk, skb);
766e9037 345 return -ENOMEM;
f0088a50
DV		 346 }
347
fda9ef5d 348 err = sk_filter(sk, skb);
f0088a50 349 if (err)
766e9037 350 return err;
f0088a50 351
3ab224be 352 if (!sk_rmem_schedule(sk, skb->truesize)) {
766e9037
ED		 353 atomic_inc(&sk->sk_drops);
354 return -ENOBUFS;
3ab224be
HA		 355 }
356
f0088a50
DV		 357 skb->dev = NULL;
358 skb_set_owner_r(skb, sk);
49ad9599 359
f0088a50
DV		 360 /* Cache the SKB length before we tack it onto the receive
361 * queue. Once it is added it no longer belongs to us and
362 * may be freed by other threads of control pulling packets
363 * from the queue.
364 */
365 skb_len = skb->len;
366
7fee226a
ED		 367 /* we escape from rcu protected region, make sure we dont leak
368 * a norefcounted dst
369 */
370 skb_dst_force(skb);
371
3b885787
NH		 372 spin_lock_irqsave(&list->lock, flags);
373 skb->dropcount = atomic_read(&sk->sk_drops);
374 __skb_queue_tail(list, skb);
375 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 376
377 if (!sock_flag(sk, SOCK_DEAD))
378 sk->sk_data_ready(sk, skb_len);
766e9037 379 return 0;
f0088a50
DV		 380}
381EXPORT_SYMBOL(sock_queue_rcv_skb);
382
58a5a7b9 383int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 384{
385 int rc = NET_RX_SUCCESS;
386
fda9ef5d 387 if (sk_filter(sk, skb))
f0088a50
DV		 388 goto discard_and_relse;
389
390 skb->dev = NULL;
391
c377411f
ED		 392 if (sk_rcvqueues_full(sk, skb)) {
393 atomic_inc(&sk->sk_drops);
394 goto discard_and_relse;
395 }
58a5a7b9
ACM		 396 if (nested)
397 bh_lock_sock_nested(sk);
398 else
399 bh_lock_sock(sk);
a5b5bb9a
IM		 400 if (!sock_owned_by_user(sk)) {
401 /*
402 * trylock + unlock semantics:
403 */
404 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
405
c57943a1 406 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 407
408 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
a3a858ff 409 } else if (sk_add_backlog(sk, skb)) {
8eae939f
ZY		 410 bh_unlock_sock(sk);
411 atomic_inc(&sk->sk_drops);
412 goto discard_and_relse;
413 }
414
f0088a50
DV		 415 bh_unlock_sock(sk);
416out:
417 sock_put(sk);
418 return rc;
419discard_and_relse:
420 kfree_skb(skb);
421 goto out;
422}
423EXPORT_SYMBOL(sk_receive_skb);
424
ea94ff3b
KK		 425void sk_reset_txq(struct sock *sk)
426{
427 sk_tx_queue_clear(sk);
428}
429EXPORT_SYMBOL(sk_reset_txq);
430
f0088a50
DV		 431struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
432{
b6c6712a 433 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 434
435 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 436 sk_tx_queue_clear(sk);
a9b3cd7f 437 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 438 dst_release(dst);
439 return NULL;
440 }
441
442 return dst;
443}
444EXPORT_SYMBOL(__sk_dst_check);
445
446struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
447{
448 struct dst_entry *dst = sk_dst_get(sk);
449
450 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
451 sk_dst_reset(sk);
452 dst_release(dst);
453 return NULL;
454 }
455
456 return dst;
457}
458EXPORT_SYMBOL(sk_dst_check);
459
4878809f
DM		 460static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
461{
462 int ret = -ENOPROTOOPT;
463#ifdef CONFIG_NETDEVICES
3b1e0a65 464 struct net *net = sock_net(sk);
4878809f
DM		 465 char devname[IFNAMSIZ];
466 int index;
467
468 /* Sorry... */
469 ret = -EPERM;
470 if (!capable(CAP_NET_RAW))
471 goto out;
472
473 ret = -EINVAL;
474 if (optlen < 0)
475 goto out;
476
477 /* Bind this socket to a particular device like "eth0",
478 * as specified in the passed interface name. If the
479 * name is "" or the option length is zero the socket
480 * is not bound.
481 */
482 if (optlen > IFNAMSIZ - 1)
483 optlen = IFNAMSIZ - 1;
484 memset(devname, 0, sizeof(devname));
485
486 ret = -EFAULT;
487 if (copy_from_user(devname, optval, optlen))
488 goto out;
489
000ba2e4
DM		 490 index = 0;
491 if (devname[0] != '\0') {
bf8e56bf 492 struct net_device *dev;
4878809f 493
bf8e56bf
ED		 494 rcu_read_lock();
495 dev = dev_get_by_name_rcu(net, devname);
496 if (dev)
497 index = dev->ifindex;
498 rcu_read_unlock();
4878809f
DM		 499 ret = -ENODEV;
500 if (!dev)
501 goto out;
4878809f
DM		 502 }
503
504 lock_sock(sk);
505 sk->sk_bound_dev_if = index;
506 sk_dst_reset(sk);
507 release_sock(sk);
508
509 ret = 0;
510
511out:
512#endif
513
514 return ret;
515}
516
c0ef877b
PE		 517static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
518{
519 if (valbool)
520 sock_set_flag(sk, bit);
521 else
522 sock_reset_flag(sk, bit);
523}
524
1da177e4
LT		 525/*
526 * This is meant for all protocols to use and covers goings on
527 * at the socket level. Everything here is generic.
528 */
529
530int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 531 char __user *optval, unsigned int optlen)
1da177e4 532{
2a91525c 533 struct sock *sk = sock->sk;
1da177e4
LT		 534 int val;
535 int valbool;
536 struct linger ling;
537 int ret = 0;
4ec93edb 538
1da177e4
LT		 539 /*
540 * Options without arguments
541 */
542
4878809f
DM		 543 if (optname == SO_BINDTODEVICE)
544 return sock_bindtodevice(sk, optval, optlen);
545
e71a4783
SH		 546 if (optlen < sizeof(int))
547 return -EINVAL;
4ec93edb 548
1da177e4
LT		 549 if (get_user(val, (int __user *)optval))
550 return -EFAULT;
4ec93edb 551
2a91525c 552 valbool = val ? 1 : 0;
1da177e4
LT		 553
554 lock_sock(sk);
555
2a91525c 556 switch (optname) {
e71a4783 557 case SO_DEBUG:
2a91525c 558 if (val && !capable(CAP_NET_ADMIN))
e71a4783 559 ret = -EACCES;
2a91525c 560 else
c0ef877b 561 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 562 break;
563 case SO_REUSEADDR:
564 sk->sk_reuse = valbool;
565 break;
566 case SO_TYPE:
49c794e9 567 case SO_PROTOCOL:
0d6038ee 568 case SO_DOMAIN:
e71a4783
SH		 569 case SO_ERROR:
570 ret = -ENOPROTOOPT;
571 break;
572 case SO_DONTROUTE:
c0ef877b 573 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 574 break;
575 case SO_BROADCAST:
576 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
577 break;
578 case SO_SNDBUF:
579 /* Don't error on this BSD doesn't and if you think
580 about it this is right. Otherwise apps have to
581 play 'guess the biggest size' games. RCVBUF/SNDBUF
582 are treated in BSD as hints */
583
584 if (val > sysctl_wmem_max)
585 val = sysctl_wmem_max;
b0573dea 586set_sndbuf:
e71a4783
SH		 587 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
588 if ((val * 2) < SOCK_MIN_SNDBUF)
589 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
590 else
591 sk->sk_sndbuf = val * 2;
1da177e4 592
e71a4783
SH		 593 /*
594 * Wake up sending tasks if we
595 * upped the value.
596 */
597 sk->sk_write_space(sk);
598 break;
1da177e4 599
e71a4783
SH		 600 case SO_SNDBUFFORCE:
601 if (!capable(CAP_NET_ADMIN)) {
602 ret = -EPERM;
603 break;
604 }
605 goto set_sndbuf;
b0573dea 606
e71a4783
SH		 607 case SO_RCVBUF:
608 /* Don't error on this BSD doesn't and if you think
609 about it this is right. Otherwise apps have to
610 play 'guess the biggest size' games. RCVBUF/SNDBUF
611 are treated in BSD as hints */
4ec93edb 612
e71a4783
SH		 613 if (val > sysctl_rmem_max)
614 val = sysctl_rmem_max;
b0573dea 615set_rcvbuf:
e71a4783
SH		 616 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
617 /*
618 * We double it on the way in to account for
619 * "struct sk_buff" etc. overhead. Applications
620 * assume that the SO_RCVBUF setting they make will
621 * allow that much actual data to be received on that
622 * socket.
623 *
624 * Applications are unaware that "struct sk_buff" and
625 * other overheads allocate from the receive buffer
626 * during socket buffer allocation.
627 *
628 * And after considering the possible alternatives,
629 * returning the value we actually used in getsockopt
630 * is the most desirable behavior.
631 */
632 if ((val * 2) < SOCK_MIN_RCVBUF)
633 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
634 else
635 sk->sk_rcvbuf = val * 2;
636 break;
637
638 case SO_RCVBUFFORCE:
639 if (!capable(CAP_NET_ADMIN)) {
640 ret = -EPERM;
1da177e4 641 break;
e71a4783
SH		 642 }
643 goto set_rcvbuf;
1da177e4 644
e71a4783 645 case SO_KEEPALIVE:
1da177e4 646#ifdef CONFIG_INET
e71a4783
SH		 647 if (sk->sk_protocol == IPPROTO_TCP)
648 tcp_set_keepalive(sk, valbool);
1da177e4 649#endif
e71a4783
SH		 650 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
651 break;
652
653 case SO_OOBINLINE:
654 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
655 break;
656
657 case SO_NO_CHECK:
658 sk->sk_no_check = valbool;
659 break;
660
661 case SO_PRIORITY:
662 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
663 sk->sk_priority = val;
664 else
665 ret = -EPERM;
666 break;
667
668 case SO_LINGER:
669 if (optlen < sizeof(ling)) {
670 ret = -EINVAL; /* 1003.1g */
1da177e4 671 break;
e71a4783 672 }
2a91525c 673 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 674 ret = -EFAULT;
1da177e4 675 break;
e71a4783
SH		 676 }
677 if (!ling.l_onoff)
678 sock_reset_flag(sk, SOCK_LINGER);
679 else {
1da177e4 680#if (BITS_PER_LONG == 32)
e71a4783
SH		 681 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
682 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 683 else
e71a4783
SH		 684#endif
685 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
686 sock_set_flag(sk, SOCK_LINGER);
687 }
688 break;
689
690 case SO_BSDCOMPAT:
691 sock_warn_obsolete_bsdism("setsockopt");
692 break;
693
694 case SO_PASSCRED:
695 if (valbool)
696 set_bit(SOCK_PASSCRED, &sock->flags);
697 else
698 clear_bit(SOCK_PASSCRED, &sock->flags);
699 break;
700
701 case SO_TIMESTAMP:
92f37fd2 702 case SO_TIMESTAMPNS:
e71a4783 703 if (valbool) {
92f37fd2
ED		 704 if (optname == SO_TIMESTAMP)
705 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
706 else
707 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 708 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 709 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 710 } else {
e71a4783 711 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 712 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
713 }
e71a4783
SH		 714 break;
715
20d49473
PO		 716 case SO_TIMESTAMPING:
717 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 718 ret = -EINVAL;
20d49473
PO		 719 break;
720 }
721 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
722 val & SOF_TIMESTAMPING_TX_HARDWARE);
723 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
724 val & SOF_TIMESTAMPING_TX_SOFTWARE);
725 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
726 val & SOF_TIMESTAMPING_RX_HARDWARE);
727 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
728 sock_enable_timestamp(sk,
729 SOCK_TIMESTAMPING_RX_SOFTWARE);
730 else
731 sock_disable_timestamp(sk,
08e29af3 732 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 733 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
734 val & SOF_TIMESTAMPING_SOFTWARE);
735 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
736 val & SOF_TIMESTAMPING_SYS_HARDWARE);
737 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
738 val & SOF_TIMESTAMPING_RAW_HARDWARE);
739 break;
740
e71a4783
SH		 741 case SO_RCVLOWAT:
742 if (val < 0)
743 val = INT_MAX;
744 sk->sk_rcvlowat = val ? : 1;
745 break;
746
747 case SO_RCVTIMEO:
748 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
749 break;
750
751 case SO_SNDTIMEO:
752 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
753 break;
1da177e4 754
e71a4783
SH		 755 case SO_ATTACH_FILTER:
756 ret = -EINVAL;
757 if (optlen == sizeof(struct sock_fprog)) {
758 struct sock_fprog fprog;
1da177e4 759
e71a4783
SH		 760 ret = -EFAULT;
761 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 762 break;
e71a4783
SH		 763
764 ret = sk_attach_filter(&fprog, sk);
765 }
766 break;
767
768 case SO_DETACH_FILTER:
55b33325 769 ret = sk_detach_filter(sk);
e71a4783 770 break;
1da177e4 771
e71a4783
SH		 772 case SO_PASSSEC:
773 if (valbool)
774 set_bit(SOCK_PASSSEC, &sock->flags);
775 else
776 clear_bit(SOCK_PASSSEC, &sock->flags);
777 break;
4a19ec58
LAT		 778 case SO_MARK:
779 if (!capable(CAP_NET_ADMIN))
780 ret = -EPERM;
2a91525c 781 else
4a19ec58 782 sk->sk_mark = val;
4a19ec58 783 break;
877ce7c1 784
1da177e4
LT		 785 /* We implement the SO_SNDLOWAT etc to
786 not be settable (1003.1g 5.3) */
3b885787 787 case SO_RXQ_OVFL:
8083f0fc 788 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 789 break;
6e3e939f
JB		 790
791 case SO_WIFI_STATUS:
792 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
793 break;
794
e71a4783
SH		 795 default:
796 ret = -ENOPROTOOPT;
797 break;
4ec93edb 798 }
1da177e4
LT		 799 release_sock(sk);
800 return ret;
801}
2a91525c 802EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 803
804
3f551f94
EB		 805void cred_to_ucred(struct pid *pid, const struct cred *cred,
806 struct ucred *ucred)
807{
808 ucred->pid = pid_vnr(pid);
809 ucred->uid = ucred->gid = -1;
810 if (cred) {
811 struct user_namespace *current_ns = current_user_ns();
812
813 ucred->uid = user_ns_map_uid(current_ns, cred, cred->euid);
814 ucred->gid = user_ns_map_gid(current_ns, cred, cred->egid);
815 }
816}
3924773a 817EXPORT_SYMBOL_GPL(cred_to_ucred);
3f551f94 818
1da177e4
LT		 819int sock_getsockopt(struct socket *sock, int level, int optname,
820 char __user *optval, int __user *optlen)
821{
822 struct sock *sk = sock->sk;
4ec93edb 823
e71a4783 824 union {
4ec93edb
YH		 825 int val;
826 struct linger ling;
1da177e4
LT		 827 struct timeval tm;
828 } v;
4ec93edb 829
4d0392be 830 int lv = sizeof(int);
1da177e4 831 int len;
4ec93edb 832
e71a4783 833 if (get_user(len, optlen))
4ec93edb 834 return -EFAULT;
e71a4783 835 if (len < 0)
1da177e4 836 return -EINVAL;
4ec93edb 837
50fee1de 838 memset(&v, 0, sizeof(v));
df0bca04 839
2a91525c 840 switch (optname) {
e71a4783
SH		 841 case SO_DEBUG:
842 v.val = sock_flag(sk, SOCK_DBG);
843 break;
844
845 case SO_DONTROUTE:
846 v.val = sock_flag(sk, SOCK_LOCALROUTE);
847 break;
848
849 case SO_BROADCAST:
850 v.val = !!sock_flag(sk, SOCK_BROADCAST);
851 break;
852
853 case SO_SNDBUF:
854 v.val = sk->sk_sndbuf;
855 break;
856
857 case SO_RCVBUF:
858 v.val = sk->sk_rcvbuf;
859 break;
860
861 case SO_REUSEADDR:
862 v.val = sk->sk_reuse;
863 break;
864
865 case SO_KEEPALIVE:
866 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
867 break;
868
869 case SO_TYPE:
870 v.val = sk->sk_type;
871 break;
872
49c794e9
JE		 873 case SO_PROTOCOL:
874 v.val = sk->sk_protocol;
875 break;
876
0d6038ee
JE		 877 case SO_DOMAIN:
878 v.val = sk->sk_family;
879 break;
880
e71a4783
SH		 881 case SO_ERROR:
882 v.val = -sock_error(sk);
2a91525c 883 if (v.val == 0)
e71a4783
SH		 884 v.val = xchg(&sk->sk_err_soft, 0);
885 break;
886
887 case SO_OOBINLINE:
888 v.val = !!sock_flag(sk, SOCK_URGINLINE);
889 break;
890
891 case SO_NO_CHECK:
892 v.val = sk->sk_no_check;
893 break;
894
895 case SO_PRIORITY:
896 v.val = sk->sk_priority;
897 break;
898
899 case SO_LINGER:
900 lv = sizeof(v.ling);
901 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
902 v.ling.l_linger = sk->sk_lingertime / HZ;
903 break;
904
905 case SO_BSDCOMPAT:
906 sock_warn_obsolete_bsdism("getsockopt");
907 break;
908
909 case SO_TIMESTAMP:
92f37fd2
ED		 910 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
911 !sock_flag(sk, SOCK_RCVTSTAMPNS);
912 break;
913
914 case SO_TIMESTAMPNS:
915 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 916 break;
917
20d49473
PO		 918 case SO_TIMESTAMPING:
919 v.val = 0;
920 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
921 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
922 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
923 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
924 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
925 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
926 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
927 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
928 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
929 v.val |= SOF_TIMESTAMPING_SOFTWARE;
930 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
931 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
932 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
933 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
934 break;
935
e71a4783 936 case SO_RCVTIMEO:
2a91525c 937 lv = sizeof(struct timeval);
e71a4783
SH		 938 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
939 v.tm.tv_sec = 0;
940 v.tm.tv_usec = 0;
941 } else {
942 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
943 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
944 }
945 break;
946
947 case SO_SNDTIMEO:
2a91525c 948 lv = sizeof(struct timeval);
e71a4783
SH		 949 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
950 v.tm.tv_sec = 0;
951 v.tm.tv_usec = 0;
952 } else {
953 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
954 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
955 }
956 break;
1da177e4 957
e71a4783
SH		 958 case SO_RCVLOWAT:
959 v.val = sk->sk_rcvlowat;
960 break;
1da177e4 961
e71a4783 962 case SO_SNDLOWAT:
2a91525c 963 v.val = 1;
e71a4783 964 break;
1da177e4 965
e71a4783
SH		 966 case SO_PASSCRED:
967 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
968 break;
1da177e4 969
e71a4783 970 case SO_PEERCRED:
109f6e39
EB		 971 {
972 struct ucred peercred;
973 if (len > sizeof(peercred))
974 len = sizeof(peercred);
975 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
976 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 977 return -EFAULT;
978 goto lenout;
109f6e39 979 }
1da177e4 980
e71a4783
SH		 981 case SO_PEERNAME:
982 {
983 char address[128];
984
985 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
986 return -ENOTCONN;
987 if (lv < len)
988 return -EINVAL;
989 if (copy_to_user(optval, address, len))
990 return -EFAULT;
991 goto lenout;
992 }
1da177e4 993
e71a4783
SH		 994 /* Dubious BSD thing... Probably nobody even uses it, but
995 * the UNIX standard wants it for whatever reason... -DaveM
996 */
997 case SO_ACCEPTCONN:
998 v.val = sk->sk_state == TCP_LISTEN;
999 break;
1da177e4 1000
e71a4783
SH		 1001 case SO_PASSSEC:
1002 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
1003 break;
877ce7c1 1004
e71a4783
SH		 1005 case SO_PEERSEC:
1006 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1007
4a19ec58
LAT		 1008 case SO_MARK:
1009 v.val = sk->sk_mark;
1010 break;
1011
3b885787
NH		 1012 case SO_RXQ_OVFL:
1013 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
1014 break;
1015
6e3e939f
JB		 1016 case SO_WIFI_STATUS:
1017 v.val = !!sock_flag(sk, SOCK_WIFI_STATUS);
1018 break;
1019
e71a4783
SH		 1020 default:
1021 return -ENOPROTOOPT;
1da177e4 1022 }
e71a4783 1023
1da177e4
LT		 1024 if (len > lv)
1025 len = lv;
1026 if (copy_to_user(optval, &v, len))
1027 return -EFAULT;
1028lenout:
4ec93edb
YH		 1029 if (put_user(len, optlen))
1030 return -EFAULT;
1031 return 0;
1da177e4
LT		 1032}
1033
a5b5bb9a
IM		 1034/*
1035 * Initialize an sk_lock.
1036 *
1037 * (We also register the sk_lock with the lock validator.)
1038 */
b6f99a21 1039static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1040{
ed07536e
PZ		 1041 sock_lock_init_class_and_name(sk,
1042 af_family_slock_key_strings[sk->sk_family],
1043 af_family_slock_keys + sk->sk_family,
1044 af_family_key_strings[sk->sk_family],
1045 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1046}
1047
4dc6dc71
ED		 1048/*
1049 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1050 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1051 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1052 */
f1a6c4da
PE		 1053static void sock_copy(struct sock *nsk, const struct sock *osk)
1054{
1055#ifdef CONFIG_SECURITY_NETWORK
1056 void *sptr = nsk->sk_security;
1057#endif
68835aba
ED		 1058 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1059
1060 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1061 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1062
f1a6c4da
PE		 1063#ifdef CONFIG_SECURITY_NETWORK
1064 nsk->sk_security = sptr;
1065 security_sk_clone(osk, nsk);
1066#endif
1067}
1068
fcbdf09d
OP		 1069/*
1070 * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
1071 * un-modified. Special care is taken when initializing object to zero.
1072 */
1073static inline void sk_prot_clear_nulls(struct sock *sk, int size)
1074{
1075 if (offsetof(struct sock, sk_node.next) != 0)
1076 memset(sk, 0, offsetof(struct sock, sk_node.next));
1077 memset(&sk->sk_node.pprev, 0,
1078 size - offsetof(struct sock, sk_node.pprev));
1079}
1080
1081void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1082{
1083 unsigned long nulls1, nulls2;
1084
1085 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1086 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1087 if (nulls1 > nulls2)
1088 swap(nulls1, nulls2);
1089
1090 if (nulls1 != 0)
1091 memset((char *)sk, 0, nulls1);
1092 memset((char *)sk + nulls1 + sizeof(void *), 0,
1093 nulls2 - nulls1 - sizeof(void *));
1094 memset((char *)sk + nulls2 + sizeof(void *), 0,
1095 size - nulls2 - sizeof(void *));
1096}
1097EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1098
2e4afe7b
PE		 1099static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1100 int family)
c308c1b2
PE		 1101{
1102 struct sock *sk;
1103 struct kmem_cache *slab;
1104
1105 slab = prot->slab;
e912b114
ED		 1106 if (slab != NULL) {
1107 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1108 if (!sk)
1109 return sk;
1110 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1111 if (prot->clear_sk)
1112 prot->clear_sk(sk, prot->obj_size);
1113 else
1114 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1115 }
fcbdf09d 1116 } else
c308c1b2
PE		 1117 sk = kmalloc(prot->obj_size, priority);
1118
2e4afe7b 1119 if (sk != NULL) {
a98b65a3
VN		 1120 kmemcheck_annotate_bitfield(sk, flags);
1121
2e4afe7b
PE		 1122 if (security_sk_alloc(sk, family, priority))
1123 goto out_free;
1124
1125 if (!try_module_get(prot->owner))
1126 goto out_free_sec;
e022f0b4 1127 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1128 }
1129
c308c1b2 1130 return sk;
2e4afe7b
PE		 1131
1132out_free_sec:
1133 security_sk_free(sk);
1134out_free:
1135 if (slab != NULL)
1136 kmem_cache_free(slab, sk);
1137 else
1138 kfree(sk);
1139 return NULL;
c308c1b2
PE		 1140}
1141
1142static void sk_prot_free(struct proto *prot, struct sock *sk)
1143{
1144 struct kmem_cache *slab;
2e4afe7b 1145 struct module *owner;
c308c1b2 1146
2e4afe7b 1147 owner = prot->owner;
c308c1b2 1148 slab = prot->slab;
2e4afe7b
PE		 1149
1150 security_sk_free(sk);
c308c1b2
PE		 1151 if (slab != NULL)
1152 kmem_cache_free(slab, sk);
1153 else
1154 kfree(sk);
2e4afe7b 1155 module_put(owner);
c308c1b2
PE		 1156}
1157
f8451725
HX		 1158#ifdef CONFIG_CGROUPS
1159void sock_update_classid(struct sock *sk)
1160{
1144182a 1161 u32 classid;
f8451725 1162
1144182a
PM		 1163 rcu_read_lock(); /* doing current task, which cannot vanish. */
1164 classid = task_cls_classid(current);
1165 rcu_read_unlock();
f8451725
HX		 1166 if (classid && classid != sk->sk_classid)
1167 sk->sk_classid = classid;
1168}
82862742 1169EXPORT_SYMBOL(sock_update_classid);
5bc1421e
NH		 1170
1171void sock_update_netprioidx(struct sock *sk)
1172{
1173 struct cgroup_netprio_state *state;
1174 if (in_interrupt())
1175 return;
1176 rcu_read_lock();
1177 state = task_netprio_state(current);
1178 sk->sk_cgrp_prioidx = state ? state->prioidx : 0;
1179 rcu_read_unlock();
1180}
1181EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1182#endif
1183
1da177e4
LT		 1184/**
1185 * sk_alloc - All socket objects are allocated here
c4ea43c5 1186 * @net: the applicable net namespace
4dc3b16b
PP		 1187 * @family: protocol family
1188 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1189 * @prot: struct proto associated with this new sock instance
1da177e4 1190 */
1b8d7ae4 1191struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1192 struct proto *prot)
1da177e4 1193{
c308c1b2 1194 struct sock *sk;
1da177e4 1195
154adbc8 1196 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1197 if (sk) {
154adbc8
PE		 1198 sk->sk_family = family;
1199 /*
1200 * See comment in struct sock definition to understand
1201 * why we need sk_prot_creator -acme
1202 */
1203 sk->sk_prot = sk->sk_prot_creator = prot;
1204 sock_lock_init(sk);
3b1e0a65 1205 sock_net_set(sk, get_net(net));
d66ee058 1206 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725
HX		 1207
1208 sock_update_classid(sk);
5bc1421e 1209 sock_update_netprioidx(sk);
1da177e4 1210 }
a79af59e 1211
2e4afe7b 1212 return sk;
1da177e4 1213}
2a91525c 1214EXPORT_SYMBOL(sk_alloc);
1da177e4 1215
2b85a34e 1216static void __sk_free(struct sock *sk)
1da177e4
LT		 1217{
1218 struct sk_filter *filter;
1da177e4
LT		 1219
1220 if (sk->sk_destruct)
1221 sk->sk_destruct(sk);
1222
a898def2
PM		 1223 filter = rcu_dereference_check(sk->sk_filter,
1224 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1225 if (filter) {
309dd5fc 1226 sk_filter_uncharge(sk, filter);
a9b3cd7f 1227 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1228 }
1229
08e29af3 1230 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1231
1232 if (atomic_read(&sk->sk_omem_alloc))
1233 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 1234 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1235
109f6e39
EB		 1236 if (sk->sk_peer_cred)
1237 put_cred(sk->sk_peer_cred);
1238 put_pid(sk->sk_peer_pid);
3b1e0a65 1239 put_net(sock_net(sk));
c308c1b2 1240 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1241}
2b85a34e
ED		 1242
1243void sk_free(struct sock *sk)
1244{
1245 /*
25985edc 1246 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1247 * some packets are still in some tx queue.
1248 * If not null, sock_wfree() will call __sk_free(sk) later
1249 */
1250 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1251 __sk_free(sk);
1252}
2a91525c 1253EXPORT_SYMBOL(sk_free);
1da177e4 1254
edf02087 1255/*
25985edc
LDM		 1256 * Last sock_put should drop reference to sk->sk_net. It has already
1257 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1258 * is not an option.
25985edc 1259 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1260 * destroy it in the context of init_net.
1261 */
1262void sk_release_kernel(struct sock *sk)
1263{
1264 if (sk == NULL || sk->sk_socket == NULL)
1265 return;
1266
1267 sock_hold(sk);
1268 sock_release(sk->sk_socket);
65a18ec5 1269 release_net(sock_net(sk));
3b1e0a65 1270 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1271 sock_put(sk);
1272}
45af1754 1273EXPORT_SYMBOL(sk_release_kernel);
edf02087 1274
475f1b52
SR		 1275static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1276{
1277 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1278 sock_update_memcg(newsk);
1279}
1280
e56c57d0
ED		 1281/**
1282 * sk_clone_lock - clone a socket, and lock its clone
1283 * @sk: the socket to clone
1284 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1285 *
1286 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1287 */
1288struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1289{
8fd1d178 1290 struct sock *newsk;
87d11ceb 1291
8fd1d178 1292 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1293 if (newsk != NULL) {
1294 struct sk_filter *filter;
1295
892c141e 1296 sock_copy(newsk, sk);
87d11ceb
ACM		 1297
1298 /* SANITY */
3b1e0a65 1299 get_net(sock_net(newsk));
87d11ceb
ACM		 1300 sk_node_init(&newsk->sk_node);
1301 sock_lock_init(newsk);
1302 bh_lock_sock(newsk);
fa438ccf 1303 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1304 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1305
1306 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1307 /*
1308 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1309 */
1310 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1311 atomic_set(&newsk->sk_omem_alloc, 0);
1312 skb_queue_head_init(&newsk->sk_receive_queue);
1313 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1314#ifdef CONFIG_NET_DMA
1315 skb_queue_head_init(&newsk->sk_async_wait_queue);
1316#endif
87d11ceb 1317
b6c6712a 1318 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1319 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1320 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1321 af_callback_keys + newsk->sk_family,
1322 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1323
1324 newsk->sk_dst_cache = NULL;
1325 newsk->sk_wmem_queued = 0;
1326 newsk->sk_forward_alloc = 0;
1327 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1328 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1329
1330 sock_reset_flag(newsk, SOCK_DONE);
1331 skb_queue_head_init(&newsk->sk_error_queue);
1332
0d7da9dd 1333 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb
ACM		 1334 if (filter != NULL)
1335 sk_filter_charge(newsk, filter);
1336
1337 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1338 /* It is still raw copy of parent, so invalidate
1339 * destructor and make plain sk_free() */
1340 newsk->sk_destruct = NULL;
b0691c8e 1341 bh_unlock_sock(newsk);
87d11ceb
ACM		 1342 sk_free(newsk);
1343 newsk = NULL;
1344 goto out;
1345 }
1346
1347 newsk->sk_err = 0;
1348 newsk->sk_priority = 0;
4dc6dc71
ED		 1349 /*
1350 * Before updating sk_refcnt, we must commit prior changes to memory
1351 * (Documentation/RCU/rculist_nulls.txt for details)
1352 */
1353 smp_wmb();
87d11ceb
ACM		 1354 atomic_set(&newsk->sk_refcnt, 2);
1355
1356 /*
1357 * Increment the counter in the same struct proto as the master
1358 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1359 * is the same as sk->sk_prot->socks, as this field was copied
1360 * with memcpy).
1361 *
1362 * This _changes_ the previous behaviour, where
1363 * tcp_create_openreq_child always was incrementing the
1364 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1365 * to be taken into account in all callers. -acme
1366 */
1367 sk_refcnt_debug_inc(newsk);
972692e0 1368 sk_set_socket(newsk, NULL);
43815482 1369 newsk->sk_wq = NULL;
87d11ceb 1370
f3f511e1
GC		 1371 sk_update_clone(sk, newsk);
1372
87d11ceb 1373 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1374 sk_sockets_allocated_inc(newsk);
704da560 1375
08e29af3 1376 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1377 net_enable_timestamp();
87d11ceb
ACM		 1378 }
1379out:
1380 return newsk;
1381}
e56c57d0 1382EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1383
9958089a
AK		 1384void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1385{
1386 __sk_dst_set(sk, dst);
1387 sk->sk_route_caps = dst->dev->features;
1388 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1389 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1390 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1391 if (sk_can_gso(sk)) {
82cc1a7a 1392 if (dst->header_len) {
9958089a 1393 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1394 } else {
9958089a 1395 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1396 sk->sk_gso_max_size = dst->dev->gso_max_size;
1397 }
9958089a
AK		 1398 }
1399}
1400EXPORT_SYMBOL_GPL(sk_setup_caps);
1401
1da177e4
LT		 1402void __init sk_init(void)
1403{
4481374c 1404 if (totalram_pages <= 4096) {
1da177e4
LT		 1405 sysctl_wmem_max = 32767;
1406 sysctl_rmem_max = 32767;
1407 sysctl_wmem_default = 32767;
1408 sysctl_rmem_default = 32767;
4481374c 1409 } else if (totalram_pages >= 131072) {
1da177e4
LT		 1410 sysctl_wmem_max = 131071;
1411 sysctl_rmem_max = 131071;
1412 }
1413}
1414
1415/*
1416 * Simple resource managers for sockets.
1417 */
1418
1419
4ec93edb
YH		 1420/*
1421 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1422 */
1423void sock_wfree(struct sk_buff *skb)
1424{
1425 struct sock *sk = skb->sk;
d99927f4 1426 unsigned int len = skb->truesize;
1da177e4 1427
d99927f4
ED		 1428 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1429 /*
1430 * Keep a reference on sk_wmem_alloc, this will be released
1431 * after sk_write_space() call
1432 */
1433 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1434 sk->sk_write_space(sk);
d99927f4
ED		 1435 len = 1;
1436 }
2b85a34e 1437 /*
d99927f4
ED		 1438 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1439 * could not do because of in-flight packets
2b85a34e 1440 */
d99927f4 1441 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1442 __sk_free(sk);
1da177e4 1443}
2a91525c 1444EXPORT_SYMBOL(sock_wfree);
1da177e4 1445
4ec93edb
YH		 1446/*
1447 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1448 */
1449void sock_rfree(struct sk_buff *skb)
1450{
1451 struct sock *sk = skb->sk;
d361fd59 1452 unsigned int len = skb->truesize;
1da177e4 1453
d361fd59
ED		 1454 atomic_sub(len, &sk->sk_rmem_alloc);
1455 sk_mem_uncharge(sk, len);
1da177e4 1456}
2a91525c 1457EXPORT_SYMBOL(sock_rfree);
1da177e4
LT		 1458
1459
1460int sock_i_uid(struct sock *sk)
1461{
1462 int uid;
1463
f064af1e 1464 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1465 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
f064af1e 1466 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1467 return uid;
1468}
2a91525c 1469EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1470
1471unsigned long sock_i_ino(struct sock *sk)
1472{
1473 unsigned long ino;
1474
f064af1e 1475 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1476 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1477 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1478 return ino;
1479}
2a91525c 1480EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1481
1482/*
1483 * Allocate a skb from the socket's send buffer.
1484 */
86a76caf 1485struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1486 gfp_t priority)
1da177e4
LT		 1487{
1488 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1489 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1490 if (skb) {
1491 skb_set_owner_w(skb, sk);
1492 return skb;
1493 }
1494 }
1495 return NULL;
1496}
2a91525c 1497EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1498
1499/*
1500 * Allocate a skb from the socket's receive buffer.
4ec93edb 1501 */
86a76caf 1502struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1503 gfp_t priority)
1da177e4
LT		 1504{
1505 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1506 struct sk_buff *skb = alloc_skb(size, priority);
1507 if (skb) {
1508 skb_set_owner_r(skb, sk);
1509 return skb;
1510 }
1511 }
1512 return NULL;
1513}
1514
4ec93edb 1515/*
1da177e4 1516 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1517 */
dd0fc66f 1518void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1519{
1520 if ((unsigned)size <= sysctl_optmem_max &&
1521 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1522 void *mem;
1523 /* First do the add, to avoid the race if kmalloc
4ec93edb 1524 * might sleep.
1da177e4
LT		 1525 */
1526 atomic_add(size, &sk->sk_omem_alloc);
1527 mem = kmalloc(size, priority);
1528 if (mem)
1529 return mem;
1530 atomic_sub(size, &sk->sk_omem_alloc);
1531 }
1532 return NULL;
1533}
2a91525c 1534EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1535
1536/*
1537 * Free an option memory block.
1538 */
1539void sock_kfree_s(struct sock *sk, void *mem, int size)
1540{
1541 kfree(mem);
1542 atomic_sub(size, &sk->sk_omem_alloc);
1543}
2a91525c 1544EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1545
1546/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1547 I think, these locks should be removed for datagram sockets.
1548 */
2a91525c 1549static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1550{
1551 DEFINE_WAIT(wait);
1552
1553 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1554 for (;;) {
1555 if (!timeo)
1556 break;
1557 if (signal_pending(current))
1558 break;
1559 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1560 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1561 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1562 break;
1563 if (sk->sk_shutdown & SEND_SHUTDOWN)
1564 break;
1565 if (sk->sk_err)
1566 break;
1567 timeo = schedule_timeout(timeo);
1568 }
aa395145 1569 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1570 return timeo;
1571}
1572
1573
1574/*
1575 * Generic send/receive buffer handlers
1576 */
1577
4cc7f68d
HX		 1578struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1579 unsigned long data_len, int noblock,
1580 int *errcode)
1da177e4
LT		 1581{
1582 struct sk_buff *skb;
7d877f3b 1583 gfp_t gfp_mask;
1da177e4
LT		 1584 long timeo;
1585 int err;
1586
1587 gfp_mask = sk->sk_allocation;
1588 if (gfp_mask & __GFP_WAIT)
1589 gfp_mask |= __GFP_REPEAT;
1590
1591 timeo = sock_sndtimeo(sk, noblock);
1592 while (1) {
1593 err = sock_error(sk);
1594 if (err != 0)
1595 goto failure;
1596
1597 err = -EPIPE;
1598 if (sk->sk_shutdown & SEND_SHUTDOWN)
1599 goto failure;
1600
1601 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1602 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1603 if (skb) {
1604 int npages;
1605 int i;
1606
1607 /* No pages, we're done... */
1608 if (!data_len)
1609 break;
1610
1611 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1612 skb->truesize += data_len;
1613 skb_shinfo(skb)->nr_frags = npages;
1614 for (i = 0; i < npages; i++) {
1615 struct page *page;
1da177e4
LT		 1616
1617 page = alloc_pages(sk->sk_allocation, 0);
1618 if (!page) {
1619 err = -ENOBUFS;
1620 skb_shinfo(skb)->nr_frags = i;
1621 kfree_skb(skb);
1622 goto failure;
1623 }
1624
ea2ab693
IC		 1625 __skb_fill_page_desc(skb, i,
1626 page, 0,
1627 (data_len >= PAGE_SIZE ?
1628 PAGE_SIZE :
1629 data_len));
1da177e4
LT		 1630 data_len -= PAGE_SIZE;
1631 }
1632
1633 /* Full success... */
1634 break;
1635 }
1636 err = -ENOBUFS;
1637 goto failure;
1638 }
1639 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1640 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1641 err = -EAGAIN;
1642 if (!timeo)
1643 goto failure;
1644 if (signal_pending(current))
1645 goto interrupted;
1646 timeo = sock_wait_for_wmem(sk, timeo);
1647 }
1648
1649 skb_set_owner_w(skb, sk);
1650 return skb;
1651
1652interrupted:
1653 err = sock_intr_errno(timeo);
1654failure:
1655 *errcode = err;
1656 return NULL;
1657}
4cc7f68d 1658EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1659
4ec93edb 1660struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1661 int noblock, int *errcode)
1662{
1663 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1664}
2a91525c 1665EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4
LT		 1666
1667static void __lock_sock(struct sock *sk)
f39234d6
NK		 1668 __releases(&sk->sk_lock.slock)
1669 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1670{
1671 DEFINE_WAIT(wait);
1672
e71a4783 1673 for (;;) {
1da177e4
LT		 1674 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1675 TASK_UNINTERRUPTIBLE);
1676 spin_unlock_bh(&sk->sk_lock.slock);
1677 schedule();
1678 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1679 if (!sock_owned_by_user(sk))
1da177e4
LT		 1680 break;
1681 }
1682 finish_wait(&sk->sk_lock.wq, &wait);
1683}
1684
1685static void __release_sock(struct sock *sk)
f39234d6
NK		 1686 __releases(&sk->sk_lock.slock)
1687 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1688{
1689 struct sk_buff *skb = sk->sk_backlog.head;
1690
1691 do {
1692 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1693 bh_unlock_sock(sk);
1694
1695 do {
1696 struct sk_buff *next = skb->next;
1697
7fee226a 1698 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1699 skb->next = NULL;
c57943a1 1700 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1701
1702 /*
1703 * We are in process context here with softirqs
1704 * disabled, use cond_resched_softirq() to preempt.
1705 * This is safe to do because we've taken the backlog
1706 * queue private:
1707 */
1708 cond_resched_softirq();
1709
1710 skb = next;
1711 } while (skb != NULL);
1712
1713 bh_lock_sock(sk);
e71a4783 1714 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1715
1716 /*
1717 * Doing the zeroing here guarantee we can not loop forever
1718 * while a wild producer attempts to flood us.
1719 */
1720 sk->sk_backlog.len = 0;
1da177e4
LT		 1721}
1722
1723/**
1724 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1725 * @sk: sock to wait on
1726 * @timeo: for how long
1da177e4
LT		 1727 *
1728 * Now socket state including sk->sk_err is changed only under lock,
1729 * hence we may omit checks after joining wait queue.
1730 * We check receive queue before schedule() only as optimization;
1731 * it is very likely that release_sock() added new data.
1732 */
1733int sk_wait_data(struct sock *sk, long *timeo)
1734{
1735 int rc;
1736 DEFINE_WAIT(wait);
1737
aa395145 1738 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1739 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1740 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1741 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1742 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1743 return rc;
1744}
1da177e4
LT		 1745EXPORT_SYMBOL(sk_wait_data);
1746
3ab224be
HA		 1747/**
1748 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1749 * @sk: socket
1750 * @size: memory size to allocate
1751 * @kind: allocation type
1752 *
1753 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1754 * rmem allocation. This function assumes that protocols which have
1755 * memory_pressure use sk_wmem_queued as write buffer accounting.
1756 */
1757int __sk_mem_schedule(struct sock *sk, int size, int kind)
1758{
1759 struct proto *prot = sk->sk_prot;
1760 int amt = sk_mem_pages(size);
8d987e5c 1761 long allocated;
e1aab161 1762 int parent_status = UNDER_LIMIT;
3ab224be
HA		 1763
1764 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 1765
e1aab161 1766 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 1767
1768 /* Under limit. */
e1aab161
GC		 1769 if (parent_status == UNDER_LIMIT &&
1770 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 1771 sk_leave_memory_pressure(sk);
3ab224be
HA		 1772 return 1;
1773 }
1774
e1aab161
GC		 1775 /* Under pressure. (we or our parents) */
1776 if ((parent_status > SOFT_LIMIT) ||
1777 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 1778 sk_enter_memory_pressure(sk);
3ab224be 1779
e1aab161
GC		 1780 /* Over hard limit (we or our parents) */
1781 if ((parent_status == OVER_LIMIT) ||
1782 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 1783 goto suppress_allocation;
1784
1785 /* guarantee minimum buffer size under pressure */
1786 if (kind == SK_MEM_RECV) {
1787 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1788 return 1;
180d8cd9 1789
3ab224be
HA		 1790 } else { /* SK_MEM_SEND */
1791 if (sk->sk_type == SOCK_STREAM) {
1792 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1793 return 1;
1794 } else if (atomic_read(&sk->sk_wmem_alloc) <
1795 prot->sysctl_wmem[0])
1796 return 1;
1797 }
1798
180d8cd9 1799 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 1800 int alloc;
1801
180d8cd9 1802 if (!sk_under_memory_pressure(sk))
1748376b 1803 return 1;
180d8cd9
GC		 1804 alloc = sk_sockets_allocated_read_positive(sk);
1805 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 1806 sk_mem_pages(sk->sk_wmem_queued +
1807 atomic_read(&sk->sk_rmem_alloc) +
1808 sk->sk_forward_alloc))
1809 return 1;
1810 }
1811
1812suppress_allocation:
1813
1814 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1815 sk_stream_moderate_sndbuf(sk);
1816
1817 /* Fail only if socket is _under_ its sndbuf.
1818 * In this case we cannot block, so that we have to fail.
1819 */
1820 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1821 return 1;
1822 }
1823
3847ce32
SM		 1824 trace_sock_exceed_buf_limit(sk, prot, allocated);
1825
3ab224be
HA		 1826 /* Alas. Undo changes. */
1827 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 1828
e1aab161 1829 sk_memory_allocated_sub(sk, amt, parent_status);
180d8cd9 1830
3ab224be
HA		 1831 return 0;
1832}
3ab224be
HA		 1833EXPORT_SYMBOL(__sk_mem_schedule);
1834
1835/**
1836 * __sk_reclaim - reclaim memory_allocated
1837 * @sk: socket
1838 */
1839void __sk_mem_reclaim(struct sock *sk)
1840{
180d8cd9 1841 sk_memory_allocated_sub(sk,
e1aab161 1842 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT, 0);
3ab224be
HA		 1843 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1844
180d8cd9
GC		 1845 if (sk_under_memory_pressure(sk) &&
1846 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
1847 sk_leave_memory_pressure(sk);
3ab224be 1848}
3ab224be
HA		 1849EXPORT_SYMBOL(__sk_mem_reclaim);
1850
1851
1da177e4
LT		 1852/*
1853 * Set of default routines for initialising struct proto_ops when
1854 * the protocol does not support a particular function. In certain
1855 * cases where it makes no sense for a protocol to have a "do nothing"
1856 * function, some default processing is provided.
1857 */
1858
1859int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1860{
1861 return -EOPNOTSUPP;
1862}
2a91525c 1863EXPORT_SYMBOL(sock_no_bind);
1da177e4 1864
4ec93edb 1865int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1866 int len, int flags)
1867{
1868 return -EOPNOTSUPP;
1869}
2a91525c 1870EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 1871
1872int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1873{
1874 return -EOPNOTSUPP;
1875}
2a91525c 1876EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 1877
1878int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1879{
1880 return -EOPNOTSUPP;
1881}
2a91525c 1882EXPORT_SYMBOL(sock_no_accept);
1da177e4 1883
4ec93edb 1884int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1885 int *len, int peer)
1886{
1887 return -EOPNOTSUPP;
1888}
2a91525c 1889EXPORT_SYMBOL(sock_no_getname);
1da177e4 1890
2a91525c 1891unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 1892{
1893 return 0;
1894}
2a91525c 1895EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 1896
1897int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1898{
1899 return -EOPNOTSUPP;
1900}
2a91525c 1901EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 1902
1903int sock_no_listen(struct socket *sock, int backlog)
1904{
1905 return -EOPNOTSUPP;
1906}
2a91525c 1907EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 1908
1909int sock_no_shutdown(struct socket *sock, int how)
1910{
1911 return -EOPNOTSUPP;
1912}
2a91525c 1913EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 1914
1915int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 1916 char __user *optval, unsigned int optlen)
1da177e4
LT		 1917{
1918 return -EOPNOTSUPP;
1919}
2a91525c 1920EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 1921
1922int sock_no_getsockopt(struct socket *sock, int level, int optname,
1923 char __user *optval, int __user *optlen)
1924{
1925 return -EOPNOTSUPP;
1926}
2a91525c 1927EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 1928
1929int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1930 size_t len)
1931{
1932 return -EOPNOTSUPP;
1933}
2a91525c 1934EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 1935
1936int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1937 size_t len, int flags)
1938{
1939 return -EOPNOTSUPP;
1940}
2a91525c 1941EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 1942
1943int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1944{
1945 /* Mirror missing mmap method error code */
1946 return -ENODEV;
1947}
2a91525c 1948EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 1949
1950ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1951{
1952 ssize_t res;
1953 struct msghdr msg = {.msg_flags = flags};
1954 struct kvec iov;
1955 char *kaddr = kmap(page);
1956 iov.iov_base = kaddr + offset;
1957 iov.iov_len = size;
1958 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1959 kunmap(page);
1960 return res;
1961}
2a91525c 1962EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 1963
1964/*
1965 * Default Socket Callbacks
1966 */
1967
1968static void sock_def_wakeup(struct sock *sk)
1969{
43815482
ED		 1970 struct socket_wq *wq;
1971
1972 rcu_read_lock();
1973 wq = rcu_dereference(sk->sk_wq);
1974 if (wq_has_sleeper(wq))
1975 wake_up_interruptible_all(&wq->wait);
1976 rcu_read_unlock();
1da177e4
LT		 1977}
1978
1979static void sock_def_error_report(struct sock *sk)
1980{
43815482
ED		 1981 struct socket_wq *wq;
1982
1983 rcu_read_lock();
1984 wq = rcu_dereference(sk->sk_wq);
1985 if (wq_has_sleeper(wq))
1986 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 1987 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 1988 rcu_read_unlock();
1da177e4
LT		 1989}
1990
1991static void sock_def_readable(struct sock *sk, int len)
1992{
43815482
ED		 1993 struct socket_wq *wq;
1994
1995 rcu_read_lock();
1996 wq = rcu_dereference(sk->sk_wq);
1997 if (wq_has_sleeper(wq))
2c6607c6 1998 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 1999 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2000 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2001 rcu_read_unlock();
1da177e4
LT		 2002}
2003
2004static void sock_def_write_space(struct sock *sk)
2005{
43815482
ED		 2006 struct socket_wq *wq;
2007
2008 rcu_read_lock();
1da177e4
LT		 2009
2010 /* Do not wake up a writer until he can make "significant"
2011 * progress. --DaveM
2012 */
e71a4783 2013 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2014 wq = rcu_dereference(sk->sk_wq);
2015 if (wq_has_sleeper(wq))
2016 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2017 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2018
2019 /* Should agree with poll, otherwise some programs break */
2020 if (sock_writeable(sk))
8d8ad9d7 2021 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2022 }
2023
43815482 2024 rcu_read_unlock();
1da177e4
LT		 2025}
2026
2027static void sock_def_destruct(struct sock *sk)
2028{
a51482bd 2029 kfree(sk->sk_protinfo);
1da177e4
LT		 2030}
2031
2032void sk_send_sigurg(struct sock *sk)
2033{
2034 if (sk->sk_socket && sk->sk_socket->file)
2035 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2036 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2037}
2a91525c 2038EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2039
2040void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2041 unsigned long expires)
2042{
2043 if (!mod_timer(timer, expires))
2044 sock_hold(sk);
2045}
1da177e4
LT		 2046EXPORT_SYMBOL(sk_reset_timer);
2047
2048void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2049{
2050 if (timer_pending(timer) && del_timer(timer))
2051 __sock_put(sk);
2052}
1da177e4
LT		 2053EXPORT_SYMBOL(sk_stop_timer);
2054
2055void sock_init_data(struct socket *sock, struct sock *sk)
2056{
2057 skb_queue_head_init(&sk->sk_receive_queue);
2058 skb_queue_head_init(&sk->sk_write_queue);
2059 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 2060#ifdef CONFIG_NET_DMA
2061 skb_queue_head_init(&sk->sk_async_wait_queue);
2062#endif
1da177e4
LT		 2063
2064 sk->sk_send_head = NULL;
2065
2066 init_timer(&sk->sk_timer);
4ec93edb 2067
1da177e4
LT		 2068 sk->sk_allocation = GFP_KERNEL;
2069 sk->sk_rcvbuf = sysctl_rmem_default;
2070 sk->sk_sndbuf = sysctl_wmem_default;
2071 sk->sk_state = TCP_CLOSE;
972692e0 2072 sk_set_socket(sk, sock);
1da177e4
LT		 2073
2074 sock_set_flag(sk, SOCK_ZAPPED);
2075
e71a4783 2076 if (sock) {
1da177e4 2077 sk->sk_type = sock->type;
43815482 2078 sk->sk_wq = sock->wq;
1da177e4
LT		 2079 sock->sk = sk;
2080 } else
43815482 2081 sk->sk_wq = NULL;
1da177e4 2082
b6c6712a 2083 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2084 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2085 lockdep_set_class_and_name(&sk->sk_callback_lock,
2086 af_callback_keys + sk->sk_family,
2087 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2088
2089 sk->sk_state_change = sock_def_wakeup;
2090 sk->sk_data_ready = sock_def_readable;
2091 sk->sk_write_space = sock_def_write_space;
2092 sk->sk_error_report = sock_def_error_report;
2093 sk->sk_destruct = sock_def_destruct;
2094
2095 sk->sk_sndmsg_page = NULL;
2096 sk->sk_sndmsg_off = 0;
2097
109f6e39
EB		 2098 sk->sk_peer_pid = NULL;
2099 sk->sk_peer_cred = NULL;
1da177e4
LT		 2100 sk->sk_write_pending = 0;
2101 sk->sk_rcvlowat = 1;
2102 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2103 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2104
f37f0afb 2105 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2106
4dc6dc71
ED		 2107 /*
2108 * Before updating sk_refcnt, we must commit prior changes to memory
2109 * (Documentation/RCU/rculist_nulls.txt for details)
2110 */
2111 smp_wmb();
1da177e4 2112 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2113 atomic_set(&sk->sk_drops, 0);
1da177e4 2114}
2a91525c 2115EXPORT_SYMBOL(sock_init_data);
1da177e4 2116
b5606c2d 2117void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2118{
2119 might_sleep();
a5b5bb9a 2120 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2121 if (sk->sk_lock.owned)
1da177e4 2122 __lock_sock(sk);
d2e9117c 2123 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2124 spin_unlock(&sk->sk_lock.slock);
2125 /*
2126 * The sk_lock has mutex_lock() semantics here:
2127 */
fcc70d5f 2128 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2129 local_bh_enable();
1da177e4 2130}
fcc70d5f 2131EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2132
b5606c2d 2133void release_sock(struct sock *sk)
1da177e4 2134{
a5b5bb9a
IM		 2135 /*
2136 * The sk_lock has mutex_unlock() semantics:
2137 */
2138 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2139
2140 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2141 if (sk->sk_backlog.tail)
2142 __release_sock(sk);
d2e9117c 2143 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 2144 if (waitqueue_active(&sk->sk_lock.wq))
2145 wake_up(&sk->sk_lock.wq);
2146 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2147}
2148EXPORT_SYMBOL(release_sock);
2149
8a74ad60
ED		 2150/**
2151 * lock_sock_fast - fast version of lock_sock
2152 * @sk: socket
2153 *
2154 * This version should be used for very small section, where process wont block
2155 * return false if fast path is taken
2156 * sk_lock.slock locked, owned = 0, BH disabled
2157 * return true if slow path is taken
2158 * sk_lock.slock unlocked, owned = 1, BH enabled
2159 */
2160bool lock_sock_fast(struct sock *sk)
2161{
2162 might_sleep();
2163 spin_lock_bh(&sk->sk_lock.slock);
2164
2165 if (!sk->sk_lock.owned)
2166 /*
2167 * Note : We must disable BH
2168 */
2169 return false;
2170
2171 __lock_sock(sk);
2172 sk->sk_lock.owned = 1;
2173 spin_unlock(&sk->sk_lock.slock);
2174 /*
2175 * The sk_lock has mutex_lock() semantics here:
2176 */
2177 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2178 local_bh_enable();
2179 return true;
2180}
2181EXPORT_SYMBOL(lock_sock_fast);
2182
1da177e4 2183int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2184{
b7aa0bf7 2185 struct timeval tv;
1da177e4 2186 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2187 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2188 tv = ktime_to_timeval(sk->sk_stamp);
2189 if (tv.tv_sec == -1)
1da177e4 2190 return -ENOENT;
b7aa0bf7
ED		 2191 if (tv.tv_sec == 0) {
2192 sk->sk_stamp = ktime_get_real();
2193 tv = ktime_to_timeval(sk->sk_stamp);
2194 }
2195 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2196}
1da177e4
LT		 2197EXPORT_SYMBOL(sock_get_timestamp);
2198
ae40eb1e
ED		 2199int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2200{
2201 struct timespec ts;
2202 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2203 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2204 ts = ktime_to_timespec(sk->sk_stamp);
2205 if (ts.tv_sec == -1)
2206 return -ENOENT;
2207 if (ts.tv_sec == 0) {
2208 sk->sk_stamp = ktime_get_real();
2209 ts = ktime_to_timespec(sk->sk_stamp);
2210 }
2211 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2212}
2213EXPORT_SYMBOL(sock_get_timestampns);
2214
20d49473 2215void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2216{
20d49473 2217 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2218 unsigned long previous_flags = sk->sk_flags;
2219
20d49473
PO		 2220 sock_set_flag(sk, flag);
2221 /*
2222 * we just set one of the two flags which require net
2223 * time stamping, but time stamping might have been on
2224 * already because of the other one
2225 */
08e29af3 2226 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2227 net_enable_timestamp();
1da177e4
LT		 2228 }
2229}
1da177e4
LT		 2230
2231/*
2232 * Get a socket option on an socket.
2233 *
2234 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2235 * asynchronous errors should be reported by getsockopt. We assume
2236 * this means if you specify SO_ERROR (otherwise whats the point of it).
2237 */
2238int sock_common_getsockopt(struct socket *sock, int level, int optname,
2239 char __user *optval, int __user *optlen)
2240{
2241 struct sock *sk = sock->sk;
2242
2243 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2244}
1da177e4
LT		 2245EXPORT_SYMBOL(sock_common_getsockopt);
2246
3fdadf7d 2247#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2248int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2249 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2250{
2251 struct sock *sk = sock->sk;
2252
1e51f951 2253 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2254 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2255 optval, optlen);
3fdadf7d
DM		 2256 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2257}
2258EXPORT_SYMBOL(compat_sock_common_getsockopt);
2259#endif
2260
1da177e4
LT		 2261int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2262 struct msghdr *msg, size_t size, int flags)
2263{
2264 struct sock *sk = sock->sk;
2265 int addr_len = 0;
2266 int err;
2267
2268 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2269 flags & ~MSG_DONTWAIT, &addr_len);
2270 if (err >= 0)
2271 msg->msg_namelen = addr_len;
2272 return err;
2273}
1da177e4
LT		 2274EXPORT_SYMBOL(sock_common_recvmsg);
2275
2276/*
2277 * Set socket options on an inet socket.
2278 */
2279int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2280 char __user *optval, unsigned int optlen)
1da177e4
LT		 2281{
2282 struct sock *sk = sock->sk;
2283
2284 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2285}
1da177e4
LT		 2286EXPORT_SYMBOL(sock_common_setsockopt);
2287
3fdadf7d 2288#ifdef CONFIG_COMPAT
543d9cfe 2289int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2290 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2291{
2292 struct sock *sk = sock->sk;
2293
543d9cfe
ACM		 2294 if (sk->sk_prot->compat_setsockopt != NULL)
2295 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2296 optval, optlen);
3fdadf7d
DM		 2297 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2298}
2299EXPORT_SYMBOL(compat_sock_common_setsockopt);
2300#endif
2301
1da177e4
LT		 2302void sk_common_release(struct sock *sk)
2303{
2304 if (sk->sk_prot->destroy)
2305 sk->sk_prot->destroy(sk);
2306
2307 /*
2308 * Observation: when sock_common_release is called, processes have
2309 * no access to socket. But net still has.
2310 * Step one, detach it from networking:
2311 *
2312 * A. Remove from hash tables.
2313 */
2314
2315 sk->sk_prot->unhash(sk);
2316
2317 /*
2318 * In this point socket cannot receive new packets, but it is possible
2319 * that some packets are in flight because some CPU runs receiver and
2320 * did hash table lookup before we unhashed socket. They will achieve
2321 * receive queue and will be purged by socket destructor.
2322 *
2323 * Also we still have packets pending on receive queue and probably,
2324 * our own packets waiting in device queues. sock_destroy will drain
2325 * receive queue, but transmitted packets will delay socket destruction
2326 * until the last reference will be released.
2327 */
2328
2329 sock_orphan(sk);
2330
2331 xfrm_sk_free_policy(sk);
2332
e6848976 2333 sk_refcnt_debug_release(sk);
1da177e4
LT		 2334 sock_put(sk);
2335}
1da177e4
LT		 2336EXPORT_SYMBOL(sk_common_release);
2337
13ff3d6f
PE		 2338#ifdef CONFIG_PROC_FS
2339#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2340struct prot_inuse {
2341 int val[PROTO_INUSE_NR];
2342};
13ff3d6f
PE		 2343
2344static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2345
2346#ifdef CONFIG_NET_NS
2347void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2348{
d6d9ca0f 2349 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2350}
2351EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2352
2353int sock_prot_inuse_get(struct net *net, struct proto *prot)
2354{
2355 int cpu, idx = prot->inuse_idx;
2356 int res = 0;
2357
2358 for_each_possible_cpu(cpu)
2359 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2360
2361 return res >= 0 ? res : 0;
2362}
2363EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2364
2c8c1e72 2365static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2366{
2367 net->core.inuse = alloc_percpu(struct prot_inuse);
2368 return net->core.inuse ? 0 : -ENOMEM;
2369}
2370
2c8c1e72 2371static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2372{
2373 free_percpu(net->core.inuse);
2374}
2375
2376static struct pernet_operations net_inuse_ops = {
2377 .init = sock_inuse_init_net,
2378 .exit = sock_inuse_exit_net,
2379};
2380
2381static __init int net_inuse_init(void)
2382{
2383 if (register_pernet_subsys(&net_inuse_ops))
2384 panic("Cannot initialize net inuse counters");
2385
2386 return 0;
2387}
2388
2389core_initcall(net_inuse_init);
2390#else
1338d466
PE		 2391static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2392
c29a0bc4 2393void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2394{
d6d9ca0f 2395 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2396}
2397EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2398
c29a0bc4 2399int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2400{
2401 int cpu, idx = prot->inuse_idx;
2402 int res = 0;
2403
2404 for_each_possible_cpu(cpu)
2405 res += per_cpu(prot_inuse, cpu).val[idx];
2406
2407 return res >= 0 ? res : 0;
2408}
2409EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2410#endif
13ff3d6f
PE		 2411
2412static void assign_proto_idx(struct proto *prot)
2413{
2414 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2415
2416 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2417 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2418 return;
2419 }
2420
2421 set_bit(prot->inuse_idx, proto_inuse_idx);
2422}
2423
2424static void release_proto_idx(struct proto *prot)
2425{
2426 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2427 clear_bit(prot->inuse_idx, proto_inuse_idx);
2428}
2429#else
2430static inline void assign_proto_idx(struct proto *prot)
2431{
2432}
2433
2434static inline void release_proto_idx(struct proto *prot)
2435{
2436}
2437#endif
2438
b733c007
PE		 2439int proto_register(struct proto *prot, int alloc_slab)
2440{
1da177e4
LT		 2441 if (alloc_slab) {
2442 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2443 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2444 NULL);
1da177e4
LT		 2445
2446 if (prot->slab == NULL) {
2447 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2448 prot->name);
60e7663d 2449 goto out;
1da177e4 2450 }
2e6599cb
ACM		 2451
2452 if (prot->rsk_prot != NULL) {
faf23422 2453 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2454 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2455 goto out_free_sock_slab;
2456
7e56b5d6 2457 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2458 prot->rsk_prot->obj_size, 0,
20c2df83 2459 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2460
2461 if (prot->rsk_prot->slab == NULL) {
2462 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2463 prot->name);
2464 goto out_free_request_sock_slab_name;
2465 }
2466 }
8feaf0c0 2467
6d6ee43e 2468 if (prot->twsk_prot != NULL) {
faf23422 2469 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2470
7e56b5d6 2471 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2472 goto out_free_request_sock_slab;
2473
6d6ee43e 2474 prot->twsk_prot->twsk_slab =
7e56b5d6 2475 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2476 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2477 0,
2478 SLAB_HWCACHE_ALIGN |
2479 prot->slab_flags,
20c2df83 2480 NULL);
6d6ee43e 2481 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2482 goto out_free_timewait_sock_slab_name;
2483 }
1da177e4
LT		 2484 }
2485
36b77a52 2486 mutex_lock(&proto_list_mutex);
1da177e4 2487 list_add(&prot->node, &proto_list);
13ff3d6f 2488 assign_proto_idx(prot);
36b77a52 2489 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2490 return 0;
2491
8feaf0c0 2492out_free_timewait_sock_slab_name:
7e56b5d6 2493 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2494out_free_request_sock_slab:
2495 if (prot->rsk_prot && prot->rsk_prot->slab) {
2496 kmem_cache_destroy(prot->rsk_prot->slab);
2497 prot->rsk_prot->slab = NULL;
2498 }
2e6599cb 2499out_free_request_sock_slab_name:
72150e9b
DC		 2500 if (prot->rsk_prot)
2501 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2502out_free_sock_slab:
2503 kmem_cache_destroy(prot->slab);
2504 prot->slab = NULL;
b733c007
PE		 2505out:
2506 return -ENOBUFS;
1da177e4 2507}
1da177e4
LT		 2508EXPORT_SYMBOL(proto_register);
2509
2510void proto_unregister(struct proto *prot)
2511{
36b77a52 2512 mutex_lock(&proto_list_mutex);
13ff3d6f 2513 release_proto_idx(prot);
0a3f4358 2514 list_del(&prot->node);
36b77a52 2515 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2516
2517 if (prot->slab != NULL) {
2518 kmem_cache_destroy(prot->slab);
2519 prot->slab = NULL;
2520 }
2521
2e6599cb 2522 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2523 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2524 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2525 prot->rsk_prot->slab = NULL;
2526 }
2527
6d6ee43e 2528 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2529 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2530 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2531 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2532 }
1da177e4 2533}
1da177e4
LT		 2534EXPORT_SYMBOL(proto_unregister);
2535
2536#ifdef CONFIG_PROC_FS
1da177e4 2537static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2538 __acquires(proto_list_mutex)
1da177e4 2539{
36b77a52 2540 mutex_lock(&proto_list_mutex);
60f0438a 2541 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2542}
2543
2544static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2545{
60f0438a 2546 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2547}
2548
2549static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2550 __releases(proto_list_mutex)
1da177e4 2551{
36b77a52 2552 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2553}
2554
2555static char proto_method_implemented(const void *method)
2556{
2557 return method == NULL ? 'n' : 'y';
2558}
180d8cd9
GC		 2559static long sock_prot_memory_allocated(struct proto *proto)
2560{
2561 return proto->memory_allocated != NULL ? proto_memory_allocated(proto): -1L;
2562}
2563
2564static char *sock_prot_memory_pressure(struct proto *proto)
2565{
2566 return proto->memory_pressure != NULL ?
2567 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2568}
1da177e4
LT		 2569
2570static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2571{
180d8cd9 2572
8d987e5c 2573 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2574 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2575 proto->name,
2576 proto->obj_size,
14e943db 2577 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2578 sock_prot_memory_allocated(proto),
2579 sock_prot_memory_pressure(proto),
1da177e4
LT		 2580 proto->max_header,
2581 proto->slab == NULL ? "no" : "yes",
2582 module_name(proto->owner),
2583 proto_method_implemented(proto->close),
2584 proto_method_implemented(proto->connect),
2585 proto_method_implemented(proto->disconnect),
2586 proto_method_implemented(proto->accept),
2587 proto_method_implemented(proto->ioctl),
2588 proto_method_implemented(proto->init),
2589 proto_method_implemented(proto->destroy),
2590 proto_method_implemented(proto->shutdown),
2591 proto_method_implemented(proto->setsockopt),
2592 proto_method_implemented(proto->getsockopt),
2593 proto_method_implemented(proto->sendmsg),
2594 proto_method_implemented(proto->recvmsg),
2595 proto_method_implemented(proto->sendpage),
2596 proto_method_implemented(proto->bind),
2597 proto_method_implemented(proto->backlog_rcv),
2598 proto_method_implemented(proto->hash),
2599 proto_method_implemented(proto->unhash),
2600 proto_method_implemented(proto->get_port),
2601 proto_method_implemented(proto->enter_memory_pressure));
2602}
2603
2604static int proto_seq_show(struct seq_file *seq, void *v)
2605{
60f0438a 2606 if (v == &proto_list)
1da177e4
LT		 2607 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2608 "protocol",
2609 "size",
2610 "sockets",
2611 "memory",
2612 "press",
2613 "maxhdr",
2614 "slab",
2615 "module",
2616 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2617 else
60f0438a 2618 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2619 return 0;
2620}
2621
f690808e 2622static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2623 .start = proto_seq_start,
2624 .next = proto_seq_next,
2625 .stop = proto_seq_stop,
2626 .show = proto_seq_show,
2627};
2628
2629static int proto_seq_open(struct inode *inode, struct file *file)
2630{
14e943db
ED		 2631 return seq_open_net(inode, file, &proto_seq_ops,
2632 sizeof(struct seq_net_private));
1da177e4
LT		 2633}
2634
9a32144e 2635static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2636 .owner = THIS_MODULE,
2637 .open = proto_seq_open,
2638 .read = seq_read,
2639 .llseek = seq_lseek,
14e943db
ED		 2640 .release = seq_release_net,
2641};
2642
2643static __net_init int proto_init_net(struct net *net)
2644{
2645 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2646 return -ENOMEM;
2647
2648 return 0;
2649}
2650
2651static __net_exit void proto_exit_net(struct net *net)
2652{
2653 proc_net_remove(net, "protocols");
2654}
2655
2656
2657static __net_initdata struct pernet_operations proto_net_ops = {
2658 .init = proto_init_net,
2659 .exit = proto_exit_net,
1da177e4
LT		 2660};
2661
2662static int __init proto_init(void)
2663{
14e943db 2664 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2665}
2666
2667subsys_initcall(proto_init);
2668
2669#endif /* PROC_FS */
Linux kernel - Deliverables
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