]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - net/core/sock.c
projects / mirror_ubuntu-bionic-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
net: remove MTU limits on a few ether_setup callers
[mirror_ubuntu-bionic-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
e005d193
JP		 92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
4fc268d2 94#include <linux/capability.h>
1da177e4 95#include <linux/errno.h>
cb820f8e 96#include <linux/errqueue.h>
1da177e4
LT		 97#include <linux/types.h>
98#include <linux/socket.h>
99#include <linux/in.h>
100#include <linux/kernel.h>
1da177e4
LT		 101#include <linux/module.h>
102#include <linux/proc_fs.h>
103#include <linux/seq_file.h>
104#include <linux/sched.h>
105#include <linux/timer.h>
106#include <linux/string.h>
107#include <linux/sockios.h>
108#include <linux/net.h>
109#include <linux/mm.h>
110#include <linux/slab.h>
111#include <linux/interrupt.h>
112#include <linux/poll.h>
113#include <linux/tcp.h>
114#include <linux/init.h>
a1f8e7f7 115#include <linux/highmem.h>
3f551f94 116#include <linux/user_namespace.h>
c5905afb 117#include <linux/static_key.h>
3969eb38 118#include <linux/memcontrol.h>
8c1ae10d 119#include <linux/prefetch.h>
1da177e4
LT		 120
121#include <asm/uaccess.h>
1da177e4
LT		 122
123#include <linux/netdevice.h>
124#include <net/protocol.h>
125#include <linux/skbuff.h>
457c4cbc 126#include <net/net_namespace.h>
2e6599cb 127#include <net/request_sock.h>
1da177e4 128#include <net/sock.h>
20d49473 129#include <linux/net_tstamp.h>
1da177e4
LT		 130#include <net/xfrm.h>
131#include <linux/ipsec.h>
f8451725 132#include <net/cls_cgroup.h>
5bc1421e 133#include <net/netprio_cgroup.h>
eb4cb008 134#include <linux/sock_diag.h>
1da177e4
LT		 135
136#include <linux/filter.h>
538950a1 137#include <net/sock_reuseport.h>
1da177e4 138
3847ce32
SM		 139#include <trace/events/sock.h>
140
1da177e4
LT		 141#ifdef CONFIG_INET
142#include <net/tcp.h>
143#endif
144
076bb0c8 145#include <net/busy_poll.h>
06021292 146
36b77a52 147static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 148static LIST_HEAD(proto_list);
149
a3b299da
EB		 150/**
151 * sk_ns_capable - General socket capability test
152 * @sk: Socket to use a capability on or through
153 * @user_ns: The user namespace of the capability to use
154 * @cap: The capability to use
155 *
156 * Test to see if the opener of the socket had when the socket was
157 * created and the current process has the capability @cap in the user
158 * namespace @user_ns.
159 */
160bool sk_ns_capable(const struct sock *sk,
161 struct user_namespace *user_ns, int cap)
162{
163 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
164 ns_capable(user_ns, cap);
165}
166EXPORT_SYMBOL(sk_ns_capable);
167
168/**
169 * sk_capable - Socket global capability test
170 * @sk: Socket to use a capability on or through
e793c0f7 171 * @cap: The global capability to use
a3b299da
EB		 172 *
173 * Test to see if the opener of the socket had when the socket was
174 * created and the current process has the capability @cap in all user
175 * namespaces.
176 */
177bool sk_capable(const struct sock *sk, int cap)
178{
179 return sk_ns_capable(sk, &init_user_ns, cap);
180}
181EXPORT_SYMBOL(sk_capable);
182
183/**
184 * sk_net_capable - Network namespace socket capability test
185 * @sk: Socket to use a capability on or through
186 * @cap: The capability to use
187 *
e793c0f7 188 * Test to see if the opener of the socket had when the socket was created
a3b299da
EB		 189 * and the current process has the capability @cap over the network namespace
190 * the socket is a member of.
191 */
192bool sk_net_capable(const struct sock *sk, int cap)
193{
194 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
195}
196EXPORT_SYMBOL(sk_net_capable);
197
da21f24d
IM		 198/*
199 * Each address family might have different locking rules, so we have
200 * one slock key per address family:
201 */
a5b5bb9a
IM		 202static struct lock_class_key af_family_keys[AF_MAX];
203static struct lock_class_key af_family_slock_keys[AF_MAX];
204
a5b5bb9a
IM		 205/*
206 * Make lock validator output more readable. (we pre-construct these
207 * strings build-time, so that runtime initialization of socket
208 * locks is fast):
209 */
36cbd3dc 210static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 211 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
212 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
213 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
214 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
215 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
216 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
217 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 218 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 219 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 220 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 221 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 222 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 223 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
0a1a37b6
DC		 224 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_KCM" ,
225 "sk_lock-AF_MAX"
a5b5bb9a 226};
36cbd3dc 227static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 228 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
229 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
230 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
231 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
232 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
233 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
234 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 235 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 236 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 237 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 238 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 239 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 240 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
0a1a37b6
DC		 241 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_KCM" ,
242 "slock-AF_MAX"
a5b5bb9a 243};
36cbd3dc 244static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 245 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
246 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
247 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
248 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
249 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
250 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
251 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 252 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 253 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 254 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 255 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 256 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 257 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
0a1a37b6
DC		 258 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_KCM" ,
259 "clock-AF_MAX"
443aef0e 260};
da21f24d
IM		 261
262/*
263 * sk_callback_lock locking rules are per-address-family,
264 * so split the lock classes by using a per-AF key:
265 */
266static struct lock_class_key af_callback_keys[AF_MAX];
267
1da177e4
LT		 268/* Take into consideration the size of the struct sk_buff overhead in the
269 * determination of these values, since that is non-constant across
270 * platforms. This makes socket queueing behavior and performance
271 * not depend upon such differences.
272 */
273#define _SK_MEM_PACKETS 256
87fb4b7b 274#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 275#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
276#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
277
278/* Run time adjustable parameters. */
ab32ea5d 279__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 280EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 281__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 282EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 283__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
284__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 285
25985edc 286/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 287int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 288EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 289
b245be1f
WB		 290int sysctl_tstamp_allow_data __read_mostly = 1;
291
c93bdd0e
MG		 292struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
293EXPORT_SYMBOL_GPL(memalloc_socks);
294
7cb02404
MG		 295/**
296 * sk_set_memalloc - sets %SOCK_MEMALLOC
297 * @sk: socket to set it on
298 *
299 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
300 * It's the responsibility of the admin to adjust min_free_kbytes
301 * to meet the requirements
302 */
303void sk_set_memalloc(struct sock *sk)
304{
305 sock_set_flag(sk, SOCK_MEMALLOC);
306 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 307 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 308}
309EXPORT_SYMBOL_GPL(sk_set_memalloc);
310
311void sk_clear_memalloc(struct sock *sk)
312{
313 sock_reset_flag(sk, SOCK_MEMALLOC);
314 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 315 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 316
317 /*
318 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
5d753610
MG		 319 * progress of swapping. SOCK_MEMALLOC may be cleared while
320 * it has rmem allocations due to the last swapfile being deactivated
321 * but there is a risk that the socket is unusable due to exceeding
322 * the rmem limits. Reclaim the reserves and obey rmem limits again.
c76562b6 323 */
5d753610 324 sk_mem_reclaim(sk);
7cb02404
MG		 325}
326EXPORT_SYMBOL_GPL(sk_clear_memalloc);
327
b4b9e355
MG		 328int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
329{
330 int ret;
331 unsigned long pflags = current->flags;
332
333 /* these should have been dropped before queueing */
334 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
335
336 current->flags |= PF_MEMALLOC;
337 ret = sk->sk_backlog_rcv(sk, skb);
338 tsk_restore_flags(current, pflags, PF_MEMALLOC);
339
340 return ret;
341}
342EXPORT_SYMBOL(__sk_backlog_rcv);
343
1da177e4
LT		 344static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
345{
346 struct timeval tv;
347
348 if (optlen < sizeof(tv))
349 return -EINVAL;
350 if (copy_from_user(&tv, optval, sizeof(tv)))
351 return -EFAULT;
ba78073e
VA		 352 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
353 return -EDOM;
1da177e4 354
ba78073e 355 if (tv.tv_sec < 0) {
6f11df83
AM		 356 static int warned __read_mostly;
357
ba78073e 358 *timeo_p = 0;
50aab54f 359 if (warned < 10 && net_ratelimit()) {
ba78073e 360 warned++;
e005d193
JP		 361 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
362 __func__, current->comm, task_pid_nr(current));
50aab54f 363 }
ba78073e
VA		 364 return 0;
365 }
1da177e4
LT		 366 *timeo_p = MAX_SCHEDULE_TIMEOUT;
367 if (tv.tv_sec == 0 && tv.tv_usec == 0)
368 return 0;
369 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
370 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
371 return 0;
372}
373
374static void sock_warn_obsolete_bsdism(const char *name)
375{
376 static int warned;
377 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 378 if (strcmp(warncomm, current->comm) && warned < 5) {
379 strcpy(warncomm, current->comm);
e005d193
JP		 380 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
381 warncomm, name);
1da177e4
LT		 382 warned++;
383 }
384}
385
080a270f
HFS		 386static bool sock_needs_netstamp(const struct sock *sk)
387{
388 switch (sk->sk_family) {
389 case AF_UNSPEC:
390 case AF_UNIX:
391 return false;
392 default:
393 return true;
394 }
395}
396
08e29af3 397static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 398{
08e29af3
ED		 399 if (sk->sk_flags & flags) {
400 sk->sk_flags &= ~flags;
080a270f
HFS		 401 if (sock_needs_netstamp(sk) &&
402 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 403 net_disable_timestamp();
1da177e4
LT		 404 }
405}
406
407
e6afc8ac 408int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
f0088a50 409{
3b885787
NH		 410 unsigned long flags;
411 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 412
0fd7bac6 413 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 414 atomic_inc(&sk->sk_drops);
3847ce32 415 trace_sock_rcvqueue_full(sk, skb);
766e9037 416 return -ENOMEM;
f0088a50
DV		 417 }
418
c76562b6 419 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 420 atomic_inc(&sk->sk_drops);
421 return -ENOBUFS;
3ab224be
HA		 422 }
423
f0088a50
DV		 424 skb->dev = NULL;
425 skb_set_owner_r(skb, sk);
49ad9599 426
7fee226a
ED		 427 /* we escape from rcu protected region, make sure we dont leak
428 * a norefcounted dst
429 */
430 skb_dst_force(skb);
431
3b885787 432 spin_lock_irqsave(&list->lock, flags);
3bc3b96f 433 sock_skb_set_dropcount(sk, skb);
3b885787
NH		 434 __skb_queue_tail(list, skb);
435 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 436
437 if (!sock_flag(sk, SOCK_DEAD))
676d2369 438 sk->sk_data_ready(sk);
766e9037 439 return 0;
f0088a50 440}
e6afc8ac 441EXPORT_SYMBOL(__sock_queue_rcv_skb);
442
443int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
444{
445 int err;
446
447 err = sk_filter(sk, skb);
448 if (err)
449 return err;
450
451 return __sock_queue_rcv_skb(sk, skb);
452}
f0088a50
DV		 453EXPORT_SYMBOL(sock_queue_rcv_skb);
454
4f0c40d9
WB		 455int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
456 const int nested, unsigned int trim_cap)
f0088a50
DV		 457{
458 int rc = NET_RX_SUCCESS;
459
4f0c40d9 460 if (sk_filter_trim_cap(sk, skb, trim_cap))
f0088a50
DV		 461 goto discard_and_relse;
462
463 skb->dev = NULL;
464
274f482d 465 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 466 atomic_inc(&sk->sk_drops);
467 goto discard_and_relse;
468 }
58a5a7b9
ACM		 469 if (nested)
470 bh_lock_sock_nested(sk);
471 else
472 bh_lock_sock(sk);
a5b5bb9a
IM		 473 if (!sock_owned_by_user(sk)) {
474 /*
475 * trylock + unlock semantics:
476 */
477 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
478
c57943a1 479 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 480
481 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 482 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 483 bh_unlock_sock(sk);
484 atomic_inc(&sk->sk_drops);
485 goto discard_and_relse;
486 }
487
f0088a50
DV		 488 bh_unlock_sock(sk);
489out:
490 sock_put(sk);
491 return rc;
492discard_and_relse:
493 kfree_skb(skb);
494 goto out;
495}
4f0c40d9 496EXPORT_SYMBOL(__sk_receive_skb);
f0088a50
DV		 497
498struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
499{
b6c6712a 500 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 501
502 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 503 sk_tx_queue_clear(sk);
a9b3cd7f 504 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 505 dst_release(dst);
506 return NULL;
507 }
508
509 return dst;
510}
511EXPORT_SYMBOL(__sk_dst_check);
512
513struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
514{
515 struct dst_entry *dst = sk_dst_get(sk);
516
517 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
518 sk_dst_reset(sk);
519 dst_release(dst);
520 return NULL;
521 }
522
523 return dst;
524}
525EXPORT_SYMBOL(sk_dst_check);
526
c91f6df2
BH		 527static int sock_setbindtodevice(struct sock *sk, char __user *optval,
528 int optlen)
4878809f
DM		 529{
530 int ret = -ENOPROTOOPT;
531#ifdef CONFIG_NETDEVICES
3b1e0a65 532 struct net *net = sock_net(sk);
4878809f
DM		 533 char devname[IFNAMSIZ];
534 int index;
535
536 /* Sorry... */
537 ret = -EPERM;
5e1fccc0 538 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 539 goto out;
540
541 ret = -EINVAL;
542 if (optlen < 0)
543 goto out;
544
545 /* Bind this socket to a particular device like "eth0",
546 * as specified in the passed interface name. If the
547 * name is "" or the option length is zero the socket
548 * is not bound.
549 */
550 if (optlen > IFNAMSIZ - 1)
551 optlen = IFNAMSIZ - 1;
552 memset(devname, 0, sizeof(devname));
553
554 ret = -EFAULT;
555 if (copy_from_user(devname, optval, optlen))
556 goto out;
557
000ba2e4
DM		 558 index = 0;
559 if (devname[0] != '\0') {
bf8e56bf 560 struct net_device *dev;
4878809f 561
bf8e56bf
ED		 562 rcu_read_lock();
563 dev = dev_get_by_name_rcu(net, devname);
564 if (dev)
565 index = dev->ifindex;
566 rcu_read_unlock();
4878809f
DM		 567 ret = -ENODEV;
568 if (!dev)
569 goto out;
4878809f
DM		 570 }
571
572 lock_sock(sk);
573 sk->sk_bound_dev_if = index;
574 sk_dst_reset(sk);
575 release_sock(sk);
576
577 ret = 0;
578
579out:
580#endif
581
582 return ret;
583}
584
c91f6df2
BH		 585static int sock_getbindtodevice(struct sock *sk, char __user *optval,
586 int __user *optlen, int len)
587{
588 int ret = -ENOPROTOOPT;
589#ifdef CONFIG_NETDEVICES
590 struct net *net = sock_net(sk);
c91f6df2 591 char devname[IFNAMSIZ];
c91f6df2
BH		 592
593 if (sk->sk_bound_dev_if == 0) {
594 len = 0;
595 goto zero;
596 }
597
598 ret = -EINVAL;
599 if (len < IFNAMSIZ)
600 goto out;
601
5dbe7c17
NS		 602 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
603 if (ret)
c91f6df2 604 goto out;
c91f6df2
BH		 605
606 len = strlen(devname) + 1;
607
608 ret = -EFAULT;
609 if (copy_to_user(optval, devname, len))
610 goto out;
611
612zero:
613 ret = -EFAULT;
614 if (put_user(len, optlen))
615 goto out;
616
617 ret = 0;
618
619out:
620#endif
621
622 return ret;
623}
624
c0ef877b
PE		 625static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
626{
627 if (valbool)
628 sock_set_flag(sk, bit);
629 else
630 sock_reset_flag(sk, bit);
631}
632
f60e5990 633bool sk_mc_loop(struct sock *sk)
634{
635 if (dev_recursion_level())
636 return false;
637 if (!sk)
638 return true;
639 switch (sk->sk_family) {
640 case AF_INET:
641 return inet_sk(sk)->mc_loop;
642#if IS_ENABLED(CONFIG_IPV6)
643 case AF_INET6:
644 return inet6_sk(sk)->mc_loop;
645#endif
646 }
647 WARN_ON(1);
648 return true;
649}
650EXPORT_SYMBOL(sk_mc_loop);
651
1da177e4
LT		 652/*
653 * This is meant for all protocols to use and covers goings on
654 * at the socket level. Everything here is generic.
655 */
656
657int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 658 char __user *optval, unsigned int optlen)
1da177e4 659{
2a91525c 660 struct sock *sk = sock->sk;
1da177e4
LT		 661 int val;
662 int valbool;
663 struct linger ling;
664 int ret = 0;
4ec93edb 665
1da177e4
LT		 666 /*
667 * Options without arguments
668 */
669
4878809f 670 if (optname == SO_BINDTODEVICE)
c91f6df2 671 return sock_setbindtodevice(sk, optval, optlen);
4878809f 672
e71a4783
SH		 673 if (optlen < sizeof(int))
674 return -EINVAL;
4ec93edb 675
1da177e4
LT		 676 if (get_user(val, (int __user *)optval))
677 return -EFAULT;
4ec93edb 678
2a91525c 679 valbool = val ? 1 : 0;
1da177e4
LT		 680
681 lock_sock(sk);
682
2a91525c 683 switch (optname) {
e71a4783 684 case SO_DEBUG:
2a91525c 685 if (val && !capable(CAP_NET_ADMIN))
e71a4783 686 ret = -EACCES;
2a91525c 687 else
c0ef877b 688 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 689 break;
690 case SO_REUSEADDR:
4a17fd52 691 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 692 break;
055dc21a
TH		 693 case SO_REUSEPORT:
694 sk->sk_reuseport = valbool;
695 break;
e71a4783 696 case SO_TYPE:
49c794e9 697 case SO_PROTOCOL:
0d6038ee 698 case SO_DOMAIN:
e71a4783
SH		 699 case SO_ERROR:
700 ret = -ENOPROTOOPT;
701 break;
702 case SO_DONTROUTE:
c0ef877b 703 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 704 break;
705 case SO_BROADCAST:
706 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
707 break;
708 case SO_SNDBUF:
709 /* Don't error on this BSD doesn't and if you think
82981930
ED		 710 * about it this is right. Otherwise apps have to
711 * play 'guess the biggest size' games. RCVBUF/SNDBUF
712 * are treated in BSD as hints
713 */
714 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 715set_sndbuf:
e71a4783 716 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 717 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
718 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 719 sk->sk_write_space(sk);
720 break;
1da177e4 721
e71a4783
SH		 722 case SO_SNDBUFFORCE:
723 if (!capable(CAP_NET_ADMIN)) {
724 ret = -EPERM;
725 break;
726 }
727 goto set_sndbuf;
b0573dea 728
e71a4783
SH		 729 case SO_RCVBUF:
730 /* Don't error on this BSD doesn't and if you think
82981930
ED		 731 * about it this is right. Otherwise apps have to
732 * play 'guess the biggest size' games. RCVBUF/SNDBUF
733 * are treated in BSD as hints
734 */
735 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 736set_rcvbuf:
e71a4783
SH		 737 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
738 /*
739 * We double it on the way in to account for
740 * "struct sk_buff" etc. overhead. Applications
741 * assume that the SO_RCVBUF setting they make will
742 * allow that much actual data to be received on that
743 * socket.
744 *
745 * Applications are unaware that "struct sk_buff" and
746 * other overheads allocate from the receive buffer
747 * during socket buffer allocation.
748 *
749 * And after considering the possible alternatives,
750 * returning the value we actually used in getsockopt
751 * is the most desirable behavior.
752 */
82981930 753 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 754 break;
755
756 case SO_RCVBUFFORCE:
757 if (!capable(CAP_NET_ADMIN)) {
758 ret = -EPERM;
1da177e4 759 break;
e71a4783
SH		 760 }
761 goto set_rcvbuf;
1da177e4 762
e71a4783 763 case SO_KEEPALIVE:
1da177e4 764#ifdef CONFIG_INET
3e10986d
ED		 765 if (sk->sk_protocol == IPPROTO_TCP &&
766 sk->sk_type == SOCK_STREAM)
e71a4783 767 tcp_set_keepalive(sk, valbool);
1da177e4 768#endif
e71a4783
SH		 769 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
770 break;
771
772 case SO_OOBINLINE:
773 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
774 break;
775
776 case SO_NO_CHECK:
28448b80 777 sk->sk_no_check_tx = valbool;
e71a4783
SH		 778 break;
779
780 case SO_PRIORITY:
5e1fccc0
EB		 781 if ((val >= 0 && val <= 6) ||
782 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 783 sk->sk_priority = val;
784 else
785 ret = -EPERM;
786 break;
787
788 case SO_LINGER:
789 if (optlen < sizeof(ling)) {
790 ret = -EINVAL; /* 1003.1g */
1da177e4 791 break;
e71a4783 792 }
2a91525c 793 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 794 ret = -EFAULT;
1da177e4 795 break;
e71a4783
SH		 796 }
797 if (!ling.l_onoff)
798 sock_reset_flag(sk, SOCK_LINGER);
799 else {
1da177e4 800#if (BITS_PER_LONG == 32)
e71a4783
SH		 801 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
802 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 803 else
e71a4783
SH		 804#endif
805 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
806 sock_set_flag(sk, SOCK_LINGER);
807 }
808 break;
809
810 case SO_BSDCOMPAT:
811 sock_warn_obsolete_bsdism("setsockopt");
812 break;
813
814 case SO_PASSCRED:
815 if (valbool)
816 set_bit(SOCK_PASSCRED, &sock->flags);
817 else
818 clear_bit(SOCK_PASSCRED, &sock->flags);
819 break;
820
821 case SO_TIMESTAMP:
92f37fd2 822 case SO_TIMESTAMPNS:
e71a4783 823 if (valbool) {
92f37fd2
ED		 824 if (optname == SO_TIMESTAMP)
825 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
826 else
827 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 828 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 829 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 830 } else {
e71a4783 831 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 832 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
833 }
e71a4783
SH		 834 break;
835
20d49473
PO		 836 case SO_TIMESTAMPING:
837 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 838 ret = -EINVAL;
20d49473
PO		 839 break;
840 }
b245be1f 841
09c2d251 842 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765 843 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
ac5cc977
WC		 844 if (sk->sk_protocol == IPPROTO_TCP &&
845 sk->sk_type == SOCK_STREAM) {
6db8b963
SHY		 846 if ((1 << sk->sk_state) &
847 (TCPF_CLOSE | TCPF_LISTEN)) {
4ed2d765
WB		 848 ret = -EINVAL;
849 break;
850 }
851 sk->sk_tskey = tcp_sk(sk)->snd_una;
852 } else {
853 sk->sk_tskey = 0;
854 }
855 }
b9f40e21 856 sk->sk_tsflags = val;
20d49473
PO		 857 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
858 sock_enable_timestamp(sk,
859 SOCK_TIMESTAMPING_RX_SOFTWARE);
860 else
861 sock_disable_timestamp(sk,
08e29af3 862 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 863 break;
864
e71a4783
SH		 865 case SO_RCVLOWAT:
866 if (val < 0)
867 val = INT_MAX;
868 sk->sk_rcvlowat = val ? : 1;
869 break;
870
871 case SO_RCVTIMEO:
872 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
873 break;
874
875 case SO_SNDTIMEO:
876 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
877 break;
1da177e4 878
e71a4783
SH		 879 case SO_ATTACH_FILTER:
880 ret = -EINVAL;
881 if (optlen == sizeof(struct sock_fprog)) {
882 struct sock_fprog fprog;
1da177e4 883
e71a4783
SH		 884 ret = -EFAULT;
885 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 886 break;
e71a4783
SH		 887
888 ret = sk_attach_filter(&fprog, sk);
889 }
890 break;
891
89aa0758
AS		 892 case SO_ATTACH_BPF:
893 ret = -EINVAL;
894 if (optlen == sizeof(u32)) {
895 u32 ufd;
896
897 ret = -EFAULT;
898 if (copy_from_user(&ufd, optval, sizeof(ufd)))
899 break;
900
901 ret = sk_attach_bpf(ufd, sk);
902 }
903 break;
904
538950a1
CG		 905 case SO_ATTACH_REUSEPORT_CBPF:
906 ret = -EINVAL;
907 if (optlen == sizeof(struct sock_fprog)) {
908 struct sock_fprog fprog;
909
910 ret = -EFAULT;
911 if (copy_from_user(&fprog, optval, sizeof(fprog)))
912 break;
913
914 ret = sk_reuseport_attach_filter(&fprog, sk);
915 }
916 break;
917
918 case SO_ATTACH_REUSEPORT_EBPF:
919 ret = -EINVAL;
920 if (optlen == sizeof(u32)) {
921 u32 ufd;
922
923 ret = -EFAULT;
924 if (copy_from_user(&ufd, optval, sizeof(ufd)))
925 break;
926
927 ret = sk_reuseport_attach_bpf(ufd, sk);
928 }
929 break;
930
e71a4783 931 case SO_DETACH_FILTER:
55b33325 932 ret = sk_detach_filter(sk);
e71a4783 933 break;
1da177e4 934
d59577b6
VB		 935 case SO_LOCK_FILTER:
936 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
937 ret = -EPERM;
938 else
939 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
940 break;
941
e71a4783
SH		 942 case SO_PASSSEC:
943 if (valbool)
944 set_bit(SOCK_PASSSEC, &sock->flags);
945 else
946 clear_bit(SOCK_PASSSEC, &sock->flags);
947 break;
4a19ec58 948 case SO_MARK:
5e1fccc0 949 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 950 ret = -EPERM;
2a91525c 951 else
4a19ec58 952 sk->sk_mark = val;
4a19ec58 953 break;
877ce7c1 954
3b885787 955 case SO_RXQ_OVFL:
8083f0fc 956 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 957 break;
6e3e939f
JB		 958
959 case SO_WIFI_STATUS:
960 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
961 break;
962
ef64a54f
PE		 963 case SO_PEEK_OFF:
964 if (sock->ops->set_peek_off)
12663bfc 965 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 966 else
967 ret = -EOPNOTSUPP;
968 break;
3bdc0eba
BG		 969
970 case SO_NOFCS:
971 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
972 break;
973
7d4c04fc
KJ		 974 case SO_SELECT_ERR_QUEUE:
975 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
976 break;
977
e0d1095a 978#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 979 case SO_BUSY_POLL:
dafcc438
ET		 980 /* allow unprivileged users to decrease the value */
981 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
982 ret = -EPERM;
983 else {
984 if (val < 0)
985 ret = -EINVAL;
986 else
987 sk->sk_ll_usec = val;
988 }
989 break;
990#endif
62748f32
ED		 991
992 case SO_MAX_PACING_RATE:
993 sk->sk_max_pacing_rate = val;
994 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
995 sk->sk_max_pacing_rate);
996 break;
997
70da268b
ED		 998 case SO_INCOMING_CPU:
999 sk->sk_incoming_cpu = val;
1000 break;
1001
a87cb3e4
TH		 1002 case SO_CNX_ADVICE:
1003 if (val == 1)
1004 dst_negative_advice(sk);
1005 break;
e71a4783
SH		 1006 default:
1007 ret = -ENOPROTOOPT;
1008 break;
4ec93edb 1009 }
1da177e4
LT		 1010 release_sock(sk);
1011 return ret;
1012}
2a91525c 1013EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 1014
1015
8f09898b 1016static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1017 struct ucred *ucred)
3f551f94
EB		 1018{
1019 ucred->pid = pid_vnr(pid);
1020 ucred->uid = ucred->gid = -1;
1021 if (cred) {
1022 struct user_namespace *current_ns = current_user_ns();
1023
b2e4f544
EB		 1024 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1025 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 1026 }
1027}
1028
1da177e4
LT		 1029int sock_getsockopt(struct socket *sock, int level, int optname,
1030 char __user *optval, int __user *optlen)
1031{
1032 struct sock *sk = sock->sk;
4ec93edb 1033
e71a4783 1034 union {
4ec93edb
YH		 1035 int val;
1036 struct linger ling;
1da177e4
LT		 1037 struct timeval tm;
1038 } v;
4ec93edb 1039
4d0392be 1040 int lv = sizeof(int);
1da177e4 1041 int len;
4ec93edb 1042
e71a4783 1043 if (get_user(len, optlen))
4ec93edb 1044 return -EFAULT;
e71a4783 1045 if (len < 0)
1da177e4 1046 return -EINVAL;
4ec93edb 1047
50fee1de 1048 memset(&v, 0, sizeof(v));
df0bca04 1049
2a91525c 1050 switch (optname) {
e71a4783
SH		 1051 case SO_DEBUG:
1052 v.val = sock_flag(sk, SOCK_DBG);
1053 break;
1054
1055 case SO_DONTROUTE:
1056 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1057 break;
1058
1059 case SO_BROADCAST:
1b23a5df 1060 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1061 break;
1062
1063 case SO_SNDBUF:
1064 v.val = sk->sk_sndbuf;
1065 break;
1066
1067 case SO_RCVBUF:
1068 v.val = sk->sk_rcvbuf;
1069 break;
1070
1071 case SO_REUSEADDR:
1072 v.val = sk->sk_reuse;
1073 break;
1074
055dc21a
TH		 1075 case SO_REUSEPORT:
1076 v.val = sk->sk_reuseport;
1077 break;
1078
e71a4783 1079 case SO_KEEPALIVE:
1b23a5df 1080 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1081 break;
1082
1083 case SO_TYPE:
1084 v.val = sk->sk_type;
1085 break;
1086
49c794e9
JE		 1087 case SO_PROTOCOL:
1088 v.val = sk->sk_protocol;
1089 break;
1090
0d6038ee
JE		 1091 case SO_DOMAIN:
1092 v.val = sk->sk_family;
1093 break;
1094
e71a4783
SH		 1095 case SO_ERROR:
1096 v.val = -sock_error(sk);
2a91525c 1097 if (v.val == 0)
e71a4783
SH		 1098 v.val = xchg(&sk->sk_err_soft, 0);
1099 break;
1100
1101 case SO_OOBINLINE:
1b23a5df 1102 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1103 break;
1104
1105 case SO_NO_CHECK:
28448b80 1106 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1107 break;
1108
1109 case SO_PRIORITY:
1110 v.val = sk->sk_priority;
1111 break;
1112
1113 case SO_LINGER:
1114 lv = sizeof(v.ling);
1b23a5df 1115 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1116 v.ling.l_linger = sk->sk_lingertime / HZ;
1117 break;
1118
1119 case SO_BSDCOMPAT:
1120 sock_warn_obsolete_bsdism("getsockopt");
1121 break;
1122
1123 case SO_TIMESTAMP:
92f37fd2
ED		 1124 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1125 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1126 break;
1127
1128 case SO_TIMESTAMPNS:
1129 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1130 break;
1131
20d49473 1132 case SO_TIMESTAMPING:
b9f40e21 1133 v.val = sk->sk_tsflags;
20d49473
PO		 1134 break;
1135
e71a4783 1136 case SO_RCVTIMEO:
2a91525c 1137 lv = sizeof(struct timeval);
e71a4783
SH		 1138 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1139 v.tm.tv_sec = 0;
1140 v.tm.tv_usec = 0;
1141 } else {
1142 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1143 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1144 }
1145 break;
1146
1147 case SO_SNDTIMEO:
2a91525c 1148 lv = sizeof(struct timeval);
e71a4783
SH		 1149 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1150 v.tm.tv_sec = 0;
1151 v.tm.tv_usec = 0;
1152 } else {
1153 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1154 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1155 }
1156 break;
1da177e4 1157
e71a4783
SH		 1158 case SO_RCVLOWAT:
1159 v.val = sk->sk_rcvlowat;
1160 break;
1da177e4 1161
e71a4783 1162 case SO_SNDLOWAT:
2a91525c 1163 v.val = 1;
e71a4783 1164 break;
1da177e4 1165
e71a4783 1166 case SO_PASSCRED:
82981930 1167 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1168 break;
1da177e4 1169
e71a4783 1170 case SO_PEERCRED:
109f6e39
EB		 1171 {
1172 struct ucred peercred;
1173 if (len > sizeof(peercred))
1174 len = sizeof(peercred);
1175 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1176 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1177 return -EFAULT;
1178 goto lenout;
109f6e39 1179 }
1da177e4 1180
e71a4783
SH		 1181 case SO_PEERNAME:
1182 {
1183 char address[128];
1184
1185 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1186 return -ENOTCONN;
1187 if (lv < len)
1188 return -EINVAL;
1189 if (copy_to_user(optval, address, len))
1190 return -EFAULT;
1191 goto lenout;
1192 }
1da177e4 1193
e71a4783
SH		 1194 /* Dubious BSD thing... Probably nobody even uses it, but
1195 * the UNIX standard wants it for whatever reason... -DaveM
1196 */
1197 case SO_ACCEPTCONN:
1198 v.val = sk->sk_state == TCP_LISTEN;
1199 break;
1da177e4 1200
e71a4783 1201 case SO_PASSSEC:
82981930 1202 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1203 break;
877ce7c1 1204
e71a4783
SH		 1205 case SO_PEERSEC:
1206 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1207
4a19ec58
LAT		 1208 case SO_MARK:
1209 v.val = sk->sk_mark;
1210 break;
1211
3b885787 1212 case SO_RXQ_OVFL:
1b23a5df 1213 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1214 break;
1215
6e3e939f 1216 case SO_WIFI_STATUS:
1b23a5df 1217 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1218 break;
1219
ef64a54f
PE		 1220 case SO_PEEK_OFF:
1221 if (!sock->ops->set_peek_off)
1222 return -EOPNOTSUPP;
1223
1224 v.val = sk->sk_peek_off;
1225 break;
bc2f7996 1226 case SO_NOFCS:
1b23a5df 1227 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1228 break;
c91f6df2 1229
f7b86bfe 1230 case SO_BINDTODEVICE:
c91f6df2
BH		 1231 return sock_getbindtodevice(sk, optval, optlen, len);
1232
a8fc9277
PE		 1233 case SO_GET_FILTER:
1234 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1235 if (len < 0)
1236 return len;
1237
1238 goto lenout;
c91f6df2 1239
d59577b6
VB		 1240 case SO_LOCK_FILTER:
1241 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1242 break;
1243
ea02f941
MS		 1244 case SO_BPF_EXTENSIONS:
1245 v.val = bpf_tell_extensions();
1246 break;
1247
7d4c04fc
KJ		 1248 case SO_SELECT_ERR_QUEUE:
1249 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1250 break;
1251
e0d1095a 1252#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1253 case SO_BUSY_POLL:
dafcc438
ET		 1254 v.val = sk->sk_ll_usec;
1255 break;
1256#endif
1257
62748f32
ED		 1258 case SO_MAX_PACING_RATE:
1259 v.val = sk->sk_max_pacing_rate;
1260 break;
1261
2c8c56e1
ED		 1262 case SO_INCOMING_CPU:
1263 v.val = sk->sk_incoming_cpu;
1264 break;
1265
e71a4783 1266 default:
443b5991
YH		 1267 /* We implement the SO_SNDLOWAT etc to not be settable
1268 * (1003.1g 7).
1269 */
e71a4783 1270 return -ENOPROTOOPT;
1da177e4 1271 }
e71a4783 1272
1da177e4
LT		 1273 if (len > lv)
1274 len = lv;
1275 if (copy_to_user(optval, &v, len))
1276 return -EFAULT;
1277lenout:
4ec93edb
YH		 1278 if (put_user(len, optlen))
1279 return -EFAULT;
1280 return 0;
1da177e4
LT		 1281}
1282
a5b5bb9a
IM		 1283/*
1284 * Initialize an sk_lock.
1285 *
1286 * (We also register the sk_lock with the lock validator.)
1287 */
b6f99a21 1288static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1289{
ed07536e
PZ		 1290 sock_lock_init_class_and_name(sk,
1291 af_family_slock_key_strings[sk->sk_family],
1292 af_family_slock_keys + sk->sk_family,
1293 af_family_key_strings[sk->sk_family],
1294 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1295}
1296
4dc6dc71
ED		 1297/*
1298 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1299 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1300 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1301 */
f1a6c4da
PE		 1302static void sock_copy(struct sock *nsk, const struct sock *osk)
1303{
1304#ifdef CONFIG_SECURITY_NETWORK
1305 void *sptr = nsk->sk_security;
1306#endif
68835aba
ED		 1307 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1308
1309 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1310 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1311
f1a6c4da
PE		 1312#ifdef CONFIG_SECURITY_NETWORK
1313 nsk->sk_security = sptr;
1314 security_sk_clone(osk, nsk);
1315#endif
1316}
1317
2e4afe7b
PE		 1318static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1319 int family)
c308c1b2
PE		 1320{
1321 struct sock *sk;
1322 struct kmem_cache *slab;
1323
1324 slab = prot->slab;
e912b114
ED		 1325 if (slab != NULL) {
1326 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1327 if (!sk)
1328 return sk;
ba2489b0
ED		 1329 if (priority & __GFP_ZERO)
1330 sk_prot_clear_nulls(sk, prot->obj_size);
fcbdf09d 1331 } else
c308c1b2
PE		 1332 sk = kmalloc(prot->obj_size, priority);
1333
2e4afe7b 1334 if (sk != NULL) {
a98b65a3
VN		 1335 kmemcheck_annotate_bitfield(sk, flags);
1336
2e4afe7b
PE		 1337 if (security_sk_alloc(sk, family, priority))
1338 goto out_free;
1339
1340 if (!try_module_get(prot->owner))
1341 goto out_free_sec;
e022f0b4 1342 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1343 }
1344
c308c1b2 1345 return sk;
2e4afe7b
PE		 1346
1347out_free_sec:
1348 security_sk_free(sk);
1349out_free:
1350 if (slab != NULL)
1351 kmem_cache_free(slab, sk);
1352 else
1353 kfree(sk);
1354 return NULL;
c308c1b2
PE		 1355}
1356
1357static void sk_prot_free(struct proto *prot, struct sock *sk)
1358{
1359 struct kmem_cache *slab;
2e4afe7b 1360 struct module *owner;
c308c1b2 1361
2e4afe7b 1362 owner = prot->owner;
c308c1b2 1363 slab = prot->slab;
2e4afe7b 1364
bd1060a1 1365 cgroup_sk_free(&sk->sk_cgrp_data);
2d758073 1366 mem_cgroup_sk_free(sk);
2e4afe7b 1367 security_sk_free(sk);
c308c1b2
PE		 1368 if (slab != NULL)
1369 kmem_cache_free(slab, sk);
1370 else
1371 kfree(sk);
2e4afe7b 1372 module_put(owner);
c308c1b2
PE		 1373}
1374
1da177e4
LT		 1375/**
1376 * sk_alloc - All socket objects are allocated here
c4ea43c5 1377 * @net: the applicable net namespace
4dc3b16b
PP		 1378 * @family: protocol family
1379 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1380 * @prot: struct proto associated with this new sock instance
11aa9c28 1381 * @kern: is this to be a kernel socket?
1da177e4 1382 */
1b8d7ae4 1383struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
11aa9c28 1384 struct proto *prot, int kern)
1da177e4 1385{
c308c1b2 1386 struct sock *sk;
1da177e4 1387
154adbc8 1388 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1389 if (sk) {
154adbc8
PE		 1390 sk->sk_family = family;
1391 /*
1392 * See comment in struct sock definition to understand
1393 * why we need sk_prot_creator -acme
1394 */
1395 sk->sk_prot = sk->sk_prot_creator = prot;
1396 sock_lock_init(sk);
26abe143
EB		 1397 sk->sk_net_refcnt = kern ? 0 : 1;
1398 if (likely(sk->sk_net_refcnt))
1399 get_net(net);
1400 sock_net_set(sk, net);
d66ee058 1401 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1402
2d758073 1403 mem_cgroup_sk_alloc(sk);
d979a39d 1404 cgroup_sk_alloc(&sk->sk_cgrp_data);
2a56a1fe
TH		 1405 sock_update_classid(&sk->sk_cgrp_data);
1406 sock_update_netprioidx(&sk->sk_cgrp_data);
1da177e4 1407 }
a79af59e 1408
2e4afe7b 1409 return sk;
1da177e4 1410}
2a91525c 1411EXPORT_SYMBOL(sk_alloc);
1da177e4 1412
a4298e45
ED		 1413/* Sockets having SOCK_RCU_FREE will call this function after one RCU
1414 * grace period. This is the case for UDP sockets and TCP listeners.
1415 */
1416static void __sk_destruct(struct rcu_head *head)
1da177e4 1417{
a4298e45 1418 struct sock *sk = container_of(head, struct sock, sk_rcu);
1da177e4 1419 struct sk_filter *filter;
1da177e4
LT		 1420
1421 if (sk->sk_destruct)
1422 sk->sk_destruct(sk);
1423
a898def2
PM		 1424 filter = rcu_dereference_check(sk->sk_filter,
1425 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1426 if (filter) {
309dd5fc 1427 sk_filter_uncharge(sk, filter);
a9b3cd7f 1428 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4 1429 }
538950a1
CG		 1430 if (rcu_access_pointer(sk->sk_reuseport_cb))
1431 reuseport_detach_sock(sk);
1da177e4 1432
08e29af3 1433 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1434
1435 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1436 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1437 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1438
109f6e39
EB		 1439 if (sk->sk_peer_cred)
1440 put_cred(sk->sk_peer_cred);
1441 put_pid(sk->sk_peer_pid);
26abe143
EB		 1442 if (likely(sk->sk_net_refcnt))
1443 put_net(sock_net(sk));
c308c1b2 1444 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1445}
2b85a34e 1446
a4298e45
ED		 1447void sk_destruct(struct sock *sk)
1448{
1449 if (sock_flag(sk, SOCK_RCU_FREE))
1450 call_rcu(&sk->sk_rcu, __sk_destruct);
1451 else
1452 __sk_destruct(&sk->sk_rcu);
1453}
1454
eb4cb008
CG		 1455static void __sk_free(struct sock *sk)
1456{
b922622e 1457 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt))
eb4cb008
CG		 1458 sock_diag_broadcast_destroy(sk);
1459 else
1460 sk_destruct(sk);
1461}
1462
2b85a34e
ED		 1463void sk_free(struct sock *sk)
1464{
1465 /*
25985edc 1466 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1467 * some packets are still in some tx queue.
1468 * If not null, sock_wfree() will call __sk_free(sk) later
1469 */
1470 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1471 __sk_free(sk);
1472}
2a91525c 1473EXPORT_SYMBOL(sk_free);
1da177e4 1474
e56c57d0
ED		 1475/**
1476 * sk_clone_lock - clone a socket, and lock its clone
1477 * @sk: the socket to clone
1478 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1479 *
1480 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1481 */
1482struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1483{
8fd1d178 1484 struct sock *newsk;
278571ba 1485 bool is_charged = true;
87d11ceb 1486
8fd1d178 1487 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1488 if (newsk != NULL) {
1489 struct sk_filter *filter;
1490
892c141e 1491 sock_copy(newsk, sk);
87d11ceb
ACM		 1492
1493 /* SANITY */
8a681736
SV		 1494 if (likely(newsk->sk_net_refcnt))
1495 get_net(sock_net(newsk));
87d11ceb
ACM		 1496 sk_node_init(&newsk->sk_node);
1497 sock_lock_init(newsk);
1498 bh_lock_sock(newsk);
fa438ccf 1499 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1500 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1501
1502 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1503 /*
1504 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1505 */
1506 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1507 atomic_set(&newsk->sk_omem_alloc, 0);
1508 skb_queue_head_init(&newsk->sk_receive_queue);
1509 skb_queue_head_init(&newsk->sk_write_queue);
1510
87d11ceb 1511 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1512 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1513 af_callback_keys + newsk->sk_family,
1514 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1515
1516 newsk->sk_dst_cache = NULL;
1517 newsk->sk_wmem_queued = 0;
1518 newsk->sk_forward_alloc = 0;
9caad864 1519 atomic_set(&newsk->sk_drops, 0);
87d11ceb 1520 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1521 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1522
1523 sock_reset_flag(newsk, SOCK_DONE);
1524 skb_queue_head_init(&newsk->sk_error_queue);
1525
0d7da9dd 1526 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1527 if (filter != NULL)
278571ba
AS		 1528 /* though it's an empty new sock, the charging may fail
1529 * if sysctl_optmem_max was changed between creation of
1530 * original socket and cloning
1531 */
1532 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1533
d188ba86 1534 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
87d11ceb
ACM		 1535 /* It is still raw copy of parent, so invalidate
1536 * destructor and make plain sk_free() */
1537 newsk->sk_destruct = NULL;
b0691c8e 1538 bh_unlock_sock(newsk);
87d11ceb
ACM		 1539 sk_free(newsk);
1540 newsk = NULL;
1541 goto out;
1542 }
fa463497 1543 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
87d11ceb
ACM		 1544
1545 newsk->sk_err = 0;
1546 newsk->sk_priority = 0;
2c8c56e1 1547 newsk->sk_incoming_cpu = raw_smp_processor_id();
33cf7c90 1548 atomic64_set(&newsk->sk_cookie, 0);
d979a39d 1549
2d758073 1550 mem_cgroup_sk_alloc(newsk);
d979a39d
JW		 1551 cgroup_sk_alloc(&newsk->sk_cgrp_data);
1552
4dc6dc71
ED		 1553 /*
1554 * Before updating sk_refcnt, we must commit prior changes to memory
1555 * (Documentation/RCU/rculist_nulls.txt for details)
1556 */
1557 smp_wmb();
87d11ceb
ACM		 1558 atomic_set(&newsk->sk_refcnt, 2);
1559
1560 /*
1561 * Increment the counter in the same struct proto as the master
1562 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1563 * is the same as sk->sk_prot->socks, as this field was copied
1564 * with memcpy).
1565 *
1566 * This _changes_ the previous behaviour, where
1567 * tcp_create_openreq_child always was incrementing the
1568 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1569 * to be taken into account in all callers. -acme
1570 */
1571 sk_refcnt_debug_inc(newsk);
972692e0 1572 sk_set_socket(newsk, NULL);
43815482 1573 newsk->sk_wq = NULL;
87d11ceb
ACM		 1574
1575 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1576 sk_sockets_allocated_inc(newsk);
704da560 1577
080a270f
HFS		 1578 if (sock_needs_netstamp(sk) &&
1579 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1580 net_enable_timestamp();
87d11ceb
ACM		 1581 }
1582out:
1583 return newsk;
1584}
e56c57d0 1585EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1586
9958089a
AK		 1587void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1588{
d6a4e26a
ED		 1589 u32 max_segs = 1;
1590
6bd4f355 1591 sk_dst_set(sk, dst);
9958089a
AK		 1592 sk->sk_route_caps = dst->dev->features;
1593 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1594 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1595 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1596 if (sk_can_gso(sk)) {
82cc1a7a 1597 if (dst->header_len) {
9958089a 1598 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1599 } else {
9958089a 1600 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1601 sk->sk_gso_max_size = dst->dev->gso_max_size;
d6a4e26a 1602 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
82cc1a7a 1603 }
9958089a 1604 }
d6a4e26a 1605 sk->sk_gso_max_segs = max_segs;
9958089a
AK		 1606}
1607EXPORT_SYMBOL_GPL(sk_setup_caps);
1608
1da177e4
LT		 1609/*
1610 * Simple resource managers for sockets.
1611 */
1612
1613
4ec93edb
YH		 1614/*
1615 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1616 */
1617void sock_wfree(struct sk_buff *skb)
1618{
1619 struct sock *sk = skb->sk;
d99927f4 1620 unsigned int len = skb->truesize;
1da177e4 1621
d99927f4
ED		 1622 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1623 /*
1624 * Keep a reference on sk_wmem_alloc, this will be released
1625 * after sk_write_space() call
1626 */
1627 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1628 sk->sk_write_space(sk);
d99927f4
ED		 1629 len = 1;
1630 }
2b85a34e 1631 /*
d99927f4
ED		 1632 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1633 * could not do because of in-flight packets
2b85a34e 1634 */
d99927f4 1635 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1636 __sk_free(sk);
1da177e4 1637}
2a91525c 1638EXPORT_SYMBOL(sock_wfree);
1da177e4 1639
1d2077ac
ED		 1640/* This variant of sock_wfree() is used by TCP,
1641 * since it sets SOCK_USE_WRITE_QUEUE.
1642 */
1643void __sock_wfree(struct sk_buff *skb)
1644{
1645 struct sock *sk = skb->sk;
1646
1647 if (atomic_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
1648 __sk_free(sk);
1649}
1650
9e17f8a4
ED		 1651void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1652{
1653 skb_orphan(skb);
1654 skb->sk = sk;
1655#ifdef CONFIG_INET
1656 if (unlikely(!sk_fullsock(sk))) {
1657 skb->destructor = sock_edemux;
1658 sock_hold(sk);
1659 return;
1660 }
1661#endif
1662 skb->destructor = sock_wfree;
1663 skb_set_hash_from_sk(skb, sk);
1664 /*
1665 * We used to take a refcount on sk, but following operation
1666 * is enough to guarantee sk_free() wont free this sock until
1667 * all in-flight packets are completed
1668 */
1669 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
1670}
1671EXPORT_SYMBOL(skb_set_owner_w);
1672
1d2077ac
ED		 1673/* This helper is used by netem, as it can hold packets in its
1674 * delay queue. We want to allow the owner socket to send more
1675 * packets, as if they were already TX completed by a typical driver.
1676 * But we also want to keep skb->sk set because some packet schedulers
1677 * rely on it (sch_fq for example). So we set skb->truesize to a small
1678 * amount (1) and decrease sk_wmem_alloc accordingly.
1679 */
f2f872f9
ED		 1680void skb_orphan_partial(struct sk_buff *skb)
1681{
1d2077ac
ED		 1682 /* If this skb is a TCP pure ACK or already went here,
1683 * we have nothing to do. 2 is already a very small truesize.
1684 */
1685 if (skb->truesize <= 2)
1686 return;
1687
f2f872f9
ED		 1688 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1689 * so we do not completely orphan skb, but transfert all
1690 * accounted bytes but one, to avoid unexpected reorders.
1691 */
1692 if (skb->destructor == sock_wfree
1693#ifdef CONFIG_INET
1694 || skb->destructor == tcp_wfree
1695#endif
1696 ) {
1697 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1698 skb->truesize = 1;
1699 } else {
1700 skb_orphan(skb);
1701 }
1702}
1703EXPORT_SYMBOL(skb_orphan_partial);
1704
4ec93edb
YH		 1705/*
1706 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1707 */
1708void sock_rfree(struct sk_buff *skb)
1709{
1710 struct sock *sk = skb->sk;
d361fd59 1711 unsigned int len = skb->truesize;
1da177e4 1712
d361fd59
ED		 1713 atomic_sub(len, &sk->sk_rmem_alloc);
1714 sk_mem_uncharge(sk, len);
1da177e4 1715}
2a91525c 1716EXPORT_SYMBOL(sock_rfree);
1da177e4 1717
7768eed8
OH		 1718/*
1719 * Buffer destructor for skbs that are not used directly in read or write
1720 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1721 */
62bccb8c
AD		 1722void sock_efree(struct sk_buff *skb)
1723{
1724 sock_put(skb->sk);
1725}
1726EXPORT_SYMBOL(sock_efree);
1727
976d0201 1728kuid_t sock_i_uid(struct sock *sk)
1da177e4 1729{
976d0201 1730 kuid_t uid;
1da177e4 1731
f064af1e 1732 read_lock_bh(&sk->sk_callback_lock);
976d0201 1733 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1734 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1735 return uid;
1736}
2a91525c 1737EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1738
1739unsigned long sock_i_ino(struct sock *sk)
1740{
1741 unsigned long ino;
1742
f064af1e 1743 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1744 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1745 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1746 return ino;
1747}
2a91525c 1748EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1749
1750/*
1751 * Allocate a skb from the socket's send buffer.
1752 */
86a76caf 1753struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1754 gfp_t priority)
1da177e4
LT		 1755{
1756 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1757 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1758 if (skb) {
1759 skb_set_owner_w(skb, sk);
1760 return skb;
1761 }
1762 }
1763 return NULL;
1764}
2a91525c 1765EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1766
4ec93edb 1767/*
1da177e4 1768 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1769 */
dd0fc66f 1770void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1771{
95c96174 1772 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1773 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1774 void *mem;
1775 /* First do the add, to avoid the race if kmalloc
4ec93edb 1776 * might sleep.
1da177e4
LT		 1777 */
1778 atomic_add(size, &sk->sk_omem_alloc);
1779 mem = kmalloc(size, priority);
1780 if (mem)
1781 return mem;
1782 atomic_sub(size, &sk->sk_omem_alloc);
1783 }
1784 return NULL;
1785}
2a91525c 1786EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1787
79e88659
DB		 1788/* Free an option memory block. Note, we actually want the inline
1789 * here as this allows gcc to detect the nullify and fold away the
1790 * condition entirely.
1da177e4 1791 */
79e88659
DB		 1792static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1793 const bool nullify)
1da177e4 1794{
e53da5fb
DM		 1795 if (WARN_ON_ONCE(!mem))
1796 return;
79e88659
DB		 1797 if (nullify)
1798 kzfree(mem);
1799 else
1800 kfree(mem);
1da177e4
LT		 1801 atomic_sub(size, &sk->sk_omem_alloc);
1802}
79e88659
DB		 1803
1804void sock_kfree_s(struct sock *sk, void *mem, int size)
1805{
1806 __sock_kfree_s(sk, mem, size, false);
1807}
2a91525c 1808EXPORT_SYMBOL(sock_kfree_s);
1da177e4 1809
79e88659
DB		 1810void sock_kzfree_s(struct sock *sk, void *mem, int size)
1811{
1812 __sock_kfree_s(sk, mem, size, true);
1813}
1814EXPORT_SYMBOL(sock_kzfree_s);
1815
1da177e4
LT		 1816/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1817 I think, these locks should be removed for datagram sockets.
1818 */
2a91525c 1819static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1820{
1821 DEFINE_WAIT(wait);
1822
9cd3e072 1823 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1da177e4
LT		 1824 for (;;) {
1825 if (!timeo)
1826 break;
1827 if (signal_pending(current))
1828 break;
1829 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1830 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1831 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1832 break;
1833 if (sk->sk_shutdown & SEND_SHUTDOWN)
1834 break;
1835 if (sk->sk_err)
1836 break;
1837 timeo = schedule_timeout(timeo);
1838 }
aa395145 1839 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1840 return timeo;
1841}
1842
1843
1844/*
1845 * Generic send/receive buffer handlers
1846 */
1847
4cc7f68d
HX		 1848struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1849 unsigned long data_len, int noblock,
28d64271 1850 int *errcode, int max_page_order)
1da177e4 1851{
2e4e4410 1852 struct sk_buff *skb;
1da177e4
LT		 1853 long timeo;
1854 int err;
1855
1da177e4 1856 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1857 for (;;) {
1da177e4
LT		 1858 err = sock_error(sk);
1859 if (err != 0)
1860 goto failure;
1861
1862 err = -EPIPE;
1863 if (sk->sk_shutdown & SEND_SHUTDOWN)
1864 goto failure;
1865
2e4e4410
ED		 1866 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1867 break;
28d64271 1868
9cd3e072 1869 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2e4e4410
ED		 1870 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1871 err = -EAGAIN;
1872 if (!timeo)
1da177e4 1873 goto failure;
2e4e4410
ED		 1874 if (signal_pending(current))
1875 goto interrupted;
1876 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1877 }
2e4e4410
ED		 1878 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1879 errcode, sk->sk_allocation);
1880 if (skb)
1881 skb_set_owner_w(skb, sk);
1da177e4
LT		 1882 return skb;
1883
1884interrupted:
1885 err = sock_intr_errno(timeo);
1886failure:
1887 *errcode = err;
1888 return NULL;
1889}
4cc7f68d 1890EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1891
4ec93edb 1892struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1893 int noblock, int *errcode)
1894{
28d64271 1895 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1896}
2a91525c 1897EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1898
39771b12
WB		 1899int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
1900 struct sockcm_cookie *sockc)
1901{
3dd17e63
SHY		 1902 u32 tsflags;
1903
39771b12
WB		 1904 switch (cmsg->cmsg_type) {
1905 case SO_MARK:
1906 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1907 return -EPERM;
1908 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1909 return -EINVAL;
1910 sockc->mark = *(u32 *)CMSG_DATA(cmsg);
1911 break;
3dd17e63
SHY		 1912 case SO_TIMESTAMPING:
1913 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
1914 return -EINVAL;
1915
1916 tsflags = *(u32 *)CMSG_DATA(cmsg);
1917 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
1918 return -EINVAL;
1919
1920 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
1921 sockc->tsflags |= tsflags;
1922 break;
779f1ede
SHY		 1923 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
1924 case SCM_RIGHTS:
1925 case SCM_CREDENTIALS:
1926 break;
39771b12
WB		 1927 default:
1928 return -EINVAL;
1929 }
1930 return 0;
1931}
1932EXPORT_SYMBOL(__sock_cmsg_send);
1933
f28ea365
EJ		 1934int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
1935 struct sockcm_cookie *sockc)
1936{
1937 struct cmsghdr *cmsg;
39771b12 1938 int ret;
f28ea365
EJ		 1939
1940 for_each_cmsghdr(cmsg, msg) {
1941 if (!CMSG_OK(msg, cmsg))
1942 return -EINVAL;
1943 if (cmsg->cmsg_level != SOL_SOCKET)
1944 continue;
39771b12
WB		 1945 ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
1946 if (ret)
1947 return ret;
f28ea365
EJ		 1948 }
1949 return 0;
1950}
1951EXPORT_SYMBOL(sock_cmsg_send);
1952
5640f768
ED		 1953/* On 32bit arches, an skb frag is limited to 2^15 */
1954#define SKB_FRAG_PAGE_ORDER get_order(32768)
1955
400dfd3a
ED		 1956/**
1957 * skb_page_frag_refill - check that a page_frag contains enough room
1958 * @sz: minimum size of the fragment we want to get
1959 * @pfrag: pointer to page_frag
82d5e2b8 1960 * @gfp: priority for memory allocation
400dfd3a
ED		 1961 *
1962 * Note: While this allocator tries to use high order pages, there is
1963 * no guarantee that allocations succeed. Therefore, @sz MUST be
1964 * less or equal than PAGE_SIZE.
1965 */
d9b2938a 1966bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1967{
5640f768 1968 if (pfrag->page) {
fe896d18 1969 if (page_ref_count(pfrag->page) == 1) {
5640f768
ED		 1970 pfrag->offset = 0;
1971 return true;
1972 }
400dfd3a 1973 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1974 return true;
1975 put_page(pfrag->page);
1976 }
1977
d9b2938a
ED		 1978 pfrag->offset = 0;
1979 if (SKB_FRAG_PAGE_ORDER) {
d0164adc
MG		 1980 /* Avoid direct reclaim but allow kswapd to wake */
1981 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
1982 __GFP_COMP | __GFP_NOWARN |
1983 __GFP_NORETRY,
d9b2938a 1984 SKB_FRAG_PAGE_ORDER);
5640f768 1985 if (likely(pfrag->page)) {
d9b2938a 1986 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 1987 return true;
1988 }
d9b2938a
ED		 1989 }
1990 pfrag->page = alloc_page(gfp);
1991 if (likely(pfrag->page)) {
1992 pfrag->size = PAGE_SIZE;
1993 return true;
1994 }
400dfd3a
ED		 1995 return false;
1996}
1997EXPORT_SYMBOL(skb_page_frag_refill);
1998
1999bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
2000{
2001 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
2002 return true;
2003
5640f768
ED		 2004 sk_enter_memory_pressure(sk);
2005 sk_stream_moderate_sndbuf(sk);
2006 return false;
2007}
2008EXPORT_SYMBOL(sk_page_frag_refill);
2009
1da177e4 2010static void __lock_sock(struct sock *sk)
f39234d6
NK		 2011 __releases(&sk->sk_lock.slock)
2012 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 2013{
2014 DEFINE_WAIT(wait);
2015
e71a4783 2016 for (;;) {
1da177e4
LT		 2017 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
2018 TASK_UNINTERRUPTIBLE);
2019 spin_unlock_bh(&sk->sk_lock.slock);
2020 schedule();
2021 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 2022 if (!sock_owned_by_user(sk))
1da177e4
LT		 2023 break;
2024 }
2025 finish_wait(&sk->sk_lock.wq, &wait);
2026}
2027
2028static void __release_sock(struct sock *sk)
f39234d6
NK		 2029 __releases(&sk->sk_lock.slock)
2030 __acquires(&sk->sk_lock.slock)
1da177e4 2031{
5413d1ba 2032 struct sk_buff *skb, *next;
1da177e4 2033
5413d1ba 2034 while ((skb = sk->sk_backlog.head) != NULL) {
1da177e4 2035 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1da177e4 2036
5413d1ba 2037 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4 2038
5413d1ba
ED		 2039 do {
2040 next = skb->next;
e4cbb02a 2041 prefetch(next);
7fee226a 2042 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 2043 skb->next = NULL;
c57943a1 2044 sk_backlog_rcv(sk, skb);
1da177e4 2045
5413d1ba 2046 cond_resched();
1da177e4
LT		 2047
2048 skb = next;
2049 } while (skb != NULL);
2050
5413d1ba
ED		 2051 spin_lock_bh(&sk->sk_lock.slock);
2052 }
8eae939f
ZY		 2053
2054 /*
2055 * Doing the zeroing here guarantee we can not loop forever
2056 * while a wild producer attempts to flood us.
2057 */
2058 sk->sk_backlog.len = 0;
1da177e4
LT		 2059}
2060
d41a69f1
ED		 2061void __sk_flush_backlog(struct sock *sk)
2062{
2063 spin_lock_bh(&sk->sk_lock.slock);
2064 __release_sock(sk);
2065 spin_unlock_bh(&sk->sk_lock.slock);
2066}
2067
1da177e4
LT		 2068/**
2069 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 2070 * @sk: sock to wait on
2071 * @timeo: for how long
dfbafc99 2072 * @skb: last skb seen on sk_receive_queue
1da177e4
LT		 2073 *
2074 * Now socket state including sk->sk_err is changed only under lock,
2075 * hence we may omit checks after joining wait queue.
2076 * We check receive queue before schedule() only as optimization;
2077 * it is very likely that release_sock() added new data.
2078 */
dfbafc99 2079int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
1da177e4
LT		 2080{
2081 int rc;
2082 DEFINE_WAIT(wait);
2083
aa395145 2084 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9cd3e072 2085 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
dfbafc99 2086 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb);
9cd3e072 2087 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
aa395145 2088 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2089 return rc;
2090}
1da177e4
LT		 2091EXPORT_SYMBOL(sk_wait_data);
2092
3ab224be
HA		 2093/**
2094 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2095 * @sk: socket
2096 * @size: memory size to allocate
2097 * @kind: allocation type
2098 *
2099 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2100 * rmem allocation. This function assumes that protocols which have
2101 * memory_pressure use sk_wmem_queued as write buffer accounting.
2102 */
2103int __sk_mem_schedule(struct sock *sk, int size, int kind)
2104{
2105 struct proto *prot = sk->sk_prot;
2106 int amt = sk_mem_pages(size);
8d987e5c 2107 long allocated;
3ab224be
HA		 2108
2109 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2110
e805605c
JW		 2111 allocated = sk_memory_allocated_add(sk, amt);
2112
baac50bb
JW		 2113 if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
2114 !mem_cgroup_charge_skmem(sk->sk_memcg, amt))
e805605c 2115 goto suppress_allocation;
3ab224be
HA		 2116
2117 /* Under limit. */
e805605c 2118 if (allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2119 sk_leave_memory_pressure(sk);
3ab224be
HA		 2120 return 1;
2121 }
2122
e805605c
JW		 2123 /* Under pressure. */
2124 if (allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2125 sk_enter_memory_pressure(sk);
3ab224be 2126
e805605c
JW		 2127 /* Over hard limit. */
2128 if (allocated > sk_prot_mem_limits(sk, 2))
3ab224be
HA		 2129 goto suppress_allocation;
2130
2131 /* guarantee minimum buffer size under pressure */
2132 if (kind == SK_MEM_RECV) {
2133 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2134 return 1;
180d8cd9 2135
3ab224be
HA		 2136 } else { /* SK_MEM_SEND */
2137 if (sk->sk_type == SOCK_STREAM) {
2138 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2139 return 1;
2140 } else if (atomic_read(&sk->sk_wmem_alloc) <
2141 prot->sysctl_wmem[0])
2142 return 1;
2143 }
2144
180d8cd9 2145 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2146 int alloc;
2147
180d8cd9 2148 if (!sk_under_memory_pressure(sk))
1748376b 2149 return 1;
180d8cd9
GC		 2150 alloc = sk_sockets_allocated_read_positive(sk);
2151 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2152 sk_mem_pages(sk->sk_wmem_queued +
2153 atomic_read(&sk->sk_rmem_alloc) +
2154 sk->sk_forward_alloc))
2155 return 1;
2156 }
2157
2158suppress_allocation:
2159
2160 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2161 sk_stream_moderate_sndbuf(sk);
2162
2163 /* Fail only if socket is _under_ its sndbuf.
2164 * In this case we cannot block, so that we have to fail.
2165 */
2166 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2167 return 1;
2168 }
2169
3847ce32
SM		 2170 trace_sock_exceed_buf_limit(sk, prot, allocated);
2171
3ab224be
HA		 2172 /* Alas. Undo changes. */
2173 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2174
0e90b31f 2175 sk_memory_allocated_sub(sk, amt);
180d8cd9 2176
baac50bb
JW		 2177 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2178 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
e805605c 2179
3ab224be
HA		 2180 return 0;
2181}
3ab224be
HA		 2182EXPORT_SYMBOL(__sk_mem_schedule);
2183
2184/**
69dba9bb 2185 * __sk_mem_reclaim - reclaim memory_allocated
3ab224be 2186 * @sk: socket
1a24e04e 2187 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
3ab224be 2188 */
1a24e04e 2189void __sk_mem_reclaim(struct sock *sk, int amount)
3ab224be 2190{
1a24e04e
ED		 2191 amount >>= SK_MEM_QUANTUM_SHIFT;
2192 sk_memory_allocated_sub(sk, amount);
2193 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
3ab224be 2194
baac50bb
JW		 2195 if (mem_cgroup_sockets_enabled && sk->sk_memcg)
2196 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
e805605c 2197
180d8cd9
GC		 2198 if (sk_under_memory_pressure(sk) &&
2199 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2200 sk_leave_memory_pressure(sk);
3ab224be 2201}
3ab224be
HA		 2202EXPORT_SYMBOL(__sk_mem_reclaim);
2203
627d2d6b 2204int sk_set_peek_off(struct sock *sk, int val)
2205{
2206 if (val < 0)
2207 return -EINVAL;
2208
2209 sk->sk_peek_off = val;
2210 return 0;
2211}
2212EXPORT_SYMBOL_GPL(sk_set_peek_off);
3ab224be 2213
1da177e4
LT		 2214/*
2215 * Set of default routines for initialising struct proto_ops when
2216 * the protocol does not support a particular function. In certain
2217 * cases where it makes no sense for a protocol to have a "do nothing"
2218 * function, some default processing is provided.
2219 */
2220
2221int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2222{
2223 return -EOPNOTSUPP;
2224}
2a91525c 2225EXPORT_SYMBOL(sock_no_bind);
1da177e4 2226
4ec93edb 2227int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2228 int len, int flags)
2229{
2230 return -EOPNOTSUPP;
2231}
2a91525c 2232EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2233
2234int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2235{
2236 return -EOPNOTSUPP;
2237}
2a91525c 2238EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2239
2240int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2241{
2242 return -EOPNOTSUPP;
2243}
2a91525c 2244EXPORT_SYMBOL(sock_no_accept);
1da177e4 2245
4ec93edb 2246int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2247 int *len, int peer)
2248{
2249 return -EOPNOTSUPP;
2250}
2a91525c 2251EXPORT_SYMBOL(sock_no_getname);
1da177e4 2252
2a91525c 2253unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2254{
2255 return 0;
2256}
2a91525c 2257EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2258
2259int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2260{
2261 return -EOPNOTSUPP;
2262}
2a91525c 2263EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2264
2265int sock_no_listen(struct socket *sock, int backlog)
2266{
2267 return -EOPNOTSUPP;
2268}
2a91525c 2269EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2270
2271int sock_no_shutdown(struct socket *sock, int how)
2272{
2273 return -EOPNOTSUPP;
2274}
2a91525c 2275EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2276
2277int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2278 char __user *optval, unsigned int optlen)
1da177e4
LT		 2279{
2280 return -EOPNOTSUPP;
2281}
2a91525c 2282EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2283
2284int sock_no_getsockopt(struct socket *sock, int level, int optname,
2285 char __user *optval, int __user *optlen)
2286{
2287 return -EOPNOTSUPP;
2288}
2a91525c 2289EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2290
1b784140 2291int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2292{
2293 return -EOPNOTSUPP;
2294}
2a91525c 2295EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2296
1b784140
YX		 2297int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2298 int flags)
1da177e4
LT		 2299{
2300 return -EOPNOTSUPP;
2301}
2a91525c 2302EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2303
2304int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2305{
2306 /* Mirror missing mmap method error code */
2307 return -ENODEV;
2308}
2a91525c 2309EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2310
2311ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2312{
2313 ssize_t res;
2314 struct msghdr msg = {.msg_flags = flags};
2315 struct kvec iov;
2316 char *kaddr = kmap(page);
2317 iov.iov_base = kaddr + offset;
2318 iov.iov_len = size;
2319 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2320 kunmap(page);
2321 return res;
2322}
2a91525c 2323EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2324
2325/*
2326 * Default Socket Callbacks
2327 */
2328
2329static void sock_def_wakeup(struct sock *sk)
2330{
43815482
ED		 2331 struct socket_wq *wq;
2332
2333 rcu_read_lock();
2334 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2335 if (skwq_has_sleeper(wq))
43815482
ED		 2336 wake_up_interruptible_all(&wq->wait);
2337 rcu_read_unlock();
1da177e4
LT		 2338}
2339
2340static void sock_def_error_report(struct sock *sk)
2341{
43815482
ED		 2342 struct socket_wq *wq;
2343
2344 rcu_read_lock();
2345 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2346 if (skwq_has_sleeper(wq))
43815482 2347 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2348 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2349 rcu_read_unlock();
1da177e4
LT		 2350}
2351
676d2369 2352static void sock_def_readable(struct sock *sk)
1da177e4 2353{
43815482
ED		 2354 struct socket_wq *wq;
2355
2356 rcu_read_lock();
2357 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2358 if (skwq_has_sleeper(wq))
2c6607c6 2359 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2360 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2361 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2362 rcu_read_unlock();
1da177e4
LT		 2363}
2364
2365static void sock_def_write_space(struct sock *sk)
2366{
43815482
ED		 2367 struct socket_wq *wq;
2368
2369 rcu_read_lock();
1da177e4
LT		 2370
2371 /* Do not wake up a writer until he can make "significant"
2372 * progress. --DaveM
2373 */
e71a4783 2374 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482 2375 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 2376 if (skwq_has_sleeper(wq))
43815482 2377 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2378 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2379
2380 /* Should agree with poll, otherwise some programs break */
2381 if (sock_writeable(sk))
8d8ad9d7 2382 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2383 }
2384
43815482 2385 rcu_read_unlock();
1da177e4
LT		 2386}
2387
2388static void sock_def_destruct(struct sock *sk)
2389{
1da177e4
LT		 2390}
2391
2392void sk_send_sigurg(struct sock *sk)
2393{
2394 if (sk->sk_socket && sk->sk_socket->file)
2395 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2396 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2397}
2a91525c 2398EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2399
2400void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2401 unsigned long expires)
2402{
2403 if (!mod_timer(timer, expires))
2404 sock_hold(sk);
2405}
1da177e4
LT		 2406EXPORT_SYMBOL(sk_reset_timer);
2407
2408void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2409{
25cc4ae9 2410 if (del_timer(timer))
1da177e4
LT		 2411 __sock_put(sk);
2412}
1da177e4
LT		 2413EXPORT_SYMBOL(sk_stop_timer);
2414
2415void sock_init_data(struct socket *sock, struct sock *sk)
2416{
2417 skb_queue_head_init(&sk->sk_receive_queue);
2418 skb_queue_head_init(&sk->sk_write_queue);
2419 skb_queue_head_init(&sk->sk_error_queue);
2420
2421 sk->sk_send_head = NULL;
2422
2423 init_timer(&sk->sk_timer);
4ec93edb 2424
1da177e4
LT		 2425 sk->sk_allocation = GFP_KERNEL;
2426 sk->sk_rcvbuf = sysctl_rmem_default;
2427 sk->sk_sndbuf = sysctl_wmem_default;
2428 sk->sk_state = TCP_CLOSE;
972692e0 2429 sk_set_socket(sk, sock);
1da177e4
LT		 2430
2431 sock_set_flag(sk, SOCK_ZAPPED);
2432
e71a4783 2433 if (sock) {
1da177e4 2434 sk->sk_type = sock->type;
43815482 2435 sk->sk_wq = sock->wq;
1da177e4
LT		 2436 sock->sk = sk;
2437 } else
43815482 2438 sk->sk_wq = NULL;
1da177e4 2439
1da177e4 2440 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2441 lockdep_set_class_and_name(&sk->sk_callback_lock,
2442 af_callback_keys + sk->sk_family,
2443 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2444
2445 sk->sk_state_change = sock_def_wakeup;
2446 sk->sk_data_ready = sock_def_readable;
2447 sk->sk_write_space = sock_def_write_space;
2448 sk->sk_error_report = sock_def_error_report;
2449 sk->sk_destruct = sock_def_destruct;
2450
5640f768
ED		 2451 sk->sk_frag.page = NULL;
2452 sk->sk_frag.offset = 0;
ef64a54f 2453 sk->sk_peek_off = -1;
1da177e4 2454
109f6e39
EB		 2455 sk->sk_peer_pid = NULL;
2456 sk->sk_peer_cred = NULL;
1da177e4
LT		 2457 sk->sk_write_pending = 0;
2458 sk->sk_rcvlowat = 1;
2459 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2460 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2461
f37f0afb 2462 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2463
e0d1095a 2464#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2465 sk->sk_napi_id = 0;
64b0dc51 2466 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2467#endif
2468
62748f32 2469 sk->sk_max_pacing_rate = ~0U;
7eec4174 2470 sk->sk_pacing_rate = ~0U;
70da268b 2471 sk->sk_incoming_cpu = -1;
4dc6dc71
ED		 2472 /*
2473 * Before updating sk_refcnt, we must commit prior changes to memory
2474 * (Documentation/RCU/rculist_nulls.txt for details)
2475 */
2476 smp_wmb();
1da177e4 2477 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2478 atomic_set(&sk->sk_drops, 0);
1da177e4 2479}
2a91525c 2480EXPORT_SYMBOL(sock_init_data);
1da177e4 2481
b5606c2d 2482void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2483{
2484 might_sleep();
a5b5bb9a 2485 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2486 if (sk->sk_lock.owned)
1da177e4 2487 __lock_sock(sk);
d2e9117c 2488 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2489 spin_unlock(&sk->sk_lock.slock);
2490 /*
2491 * The sk_lock has mutex_lock() semantics here:
2492 */
fcc70d5f 2493 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2494 local_bh_enable();
1da177e4 2495}
fcc70d5f 2496EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2497
b5606c2d 2498void release_sock(struct sock *sk)
1da177e4 2499{
a5b5bb9a 2500 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2501 if (sk->sk_backlog.tail)
2502 __release_sock(sk);
46d3ceab 2503
c3f9b018
ED		 2504 /* Warning : release_cb() might need to release sk ownership,
2505 * ie call sock_release_ownership(sk) before us.
2506 */
46d3ceab
ED		 2507 if (sk->sk_prot->release_cb)
2508 sk->sk_prot->release_cb(sk);
2509
c3f9b018 2510 sock_release_ownership(sk);
a5b5bb9a
IM		 2511 if (waitqueue_active(&sk->sk_lock.wq))
2512 wake_up(&sk->sk_lock.wq);
2513 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2514}
2515EXPORT_SYMBOL(release_sock);
2516
8a74ad60
ED		 2517/**
2518 * lock_sock_fast - fast version of lock_sock
2519 * @sk: socket
2520 *
2521 * This version should be used for very small section, where process wont block
2522 * return false if fast path is taken
2523 * sk_lock.slock locked, owned = 0, BH disabled
2524 * return true if slow path is taken
2525 * sk_lock.slock unlocked, owned = 1, BH enabled
2526 */
2527bool lock_sock_fast(struct sock *sk)
2528{
2529 might_sleep();
2530 spin_lock_bh(&sk->sk_lock.slock);
2531
2532 if (!sk->sk_lock.owned)
2533 /*
2534 * Note : We must disable BH
2535 */
2536 return false;
2537
2538 __lock_sock(sk);
2539 sk->sk_lock.owned = 1;
2540 spin_unlock(&sk->sk_lock.slock);
2541 /*
2542 * The sk_lock has mutex_lock() semantics here:
2543 */
2544 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2545 local_bh_enable();
2546 return true;
2547}
2548EXPORT_SYMBOL(lock_sock_fast);
2549
1da177e4 2550int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2551{
b7aa0bf7 2552 struct timeval tv;
1da177e4 2553 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2554 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2555 tv = ktime_to_timeval(sk->sk_stamp);
2556 if (tv.tv_sec == -1)
1da177e4 2557 return -ENOENT;
b7aa0bf7
ED		 2558 if (tv.tv_sec == 0) {
2559 sk->sk_stamp = ktime_get_real();
2560 tv = ktime_to_timeval(sk->sk_stamp);
2561 }
2562 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2563}
1da177e4
LT		 2564EXPORT_SYMBOL(sock_get_timestamp);
2565
ae40eb1e
ED		 2566int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2567{
2568 struct timespec ts;
2569 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2570 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2571 ts = ktime_to_timespec(sk->sk_stamp);
2572 if (ts.tv_sec == -1)
2573 return -ENOENT;
2574 if (ts.tv_sec == 0) {
2575 sk->sk_stamp = ktime_get_real();
2576 ts = ktime_to_timespec(sk->sk_stamp);
2577 }
2578 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2579}
2580EXPORT_SYMBOL(sock_get_timestampns);
2581
20d49473 2582void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2583{
20d49473 2584 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2585 unsigned long previous_flags = sk->sk_flags;
2586
20d49473
PO		 2587 sock_set_flag(sk, flag);
2588 /*
2589 * we just set one of the two flags which require net
2590 * time stamping, but time stamping might have been on
2591 * already because of the other one
2592 */
080a270f
HFS		 2593 if (sock_needs_netstamp(sk) &&
2594 !(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2595 net_enable_timestamp();
1da177e4
LT		 2596 }
2597}
1da177e4 2598
cb820f8e
RC		 2599int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2600 int level, int type)
2601{
2602 struct sock_exterr_skb *serr;
364a9e93 2603 struct sk_buff *skb;
cb820f8e
RC		 2604 int copied, err;
2605
2606 err = -EAGAIN;
364a9e93 2607 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2608 if (skb == NULL)
2609 goto out;
2610
2611 copied = skb->len;
2612 if (copied > len) {
2613 msg->msg_flags |= MSG_TRUNC;
2614 copied = len;
2615 }
51f3d02b 2616 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2617 if (err)
2618 goto out_free_skb;
2619
2620 sock_recv_timestamp(msg, sk, skb);
2621
2622 serr = SKB_EXT_ERR(skb);
2623 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2624
2625 msg->msg_flags |= MSG_ERRQUEUE;
2626 err = copied;
2627
cb820f8e
RC		 2628out_free_skb:
2629 kfree_skb(skb);
2630out:
2631 return err;
2632}
2633EXPORT_SYMBOL(sock_recv_errqueue);
2634
1da177e4
LT		 2635/*
2636 * Get a socket option on an socket.
2637 *
2638 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2639 * asynchronous errors should be reported by getsockopt. We assume
2640 * this means if you specify SO_ERROR (otherwise whats the point of it).
2641 */
2642int sock_common_getsockopt(struct socket *sock, int level, int optname,
2643 char __user *optval, int __user *optlen)
2644{
2645 struct sock *sk = sock->sk;
2646
2647 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2648}
1da177e4
LT		 2649EXPORT_SYMBOL(sock_common_getsockopt);
2650
3fdadf7d 2651#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2652int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2653 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2654{
2655 struct sock *sk = sock->sk;
2656
1e51f951 2657 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2658 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2659 optval, optlen);
3fdadf7d
DM		 2660 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2661}
2662EXPORT_SYMBOL(compat_sock_common_getsockopt);
2663#endif
2664
1b784140
YX		 2665int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2666 int flags)
1da177e4
LT		 2667{
2668 struct sock *sk = sock->sk;
2669 int addr_len = 0;
2670 int err;
2671
1b784140 2672 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2673 flags & ~MSG_DONTWAIT, &addr_len);
2674 if (err >= 0)
2675 msg->msg_namelen = addr_len;
2676 return err;
2677}
1da177e4
LT		 2678EXPORT_SYMBOL(sock_common_recvmsg);
2679
2680/*
2681 * Set socket options on an inet socket.
2682 */
2683int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2684 char __user *optval, unsigned int optlen)
1da177e4
LT		 2685{
2686 struct sock *sk = sock->sk;
2687
2688 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2689}
1da177e4
LT		 2690EXPORT_SYMBOL(sock_common_setsockopt);
2691
3fdadf7d 2692#ifdef CONFIG_COMPAT
543d9cfe 2693int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2694 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2695{
2696 struct sock *sk = sock->sk;
2697
543d9cfe
ACM		 2698 if (sk->sk_prot->compat_setsockopt != NULL)
2699 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2700 optval, optlen);
3fdadf7d
DM		 2701 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2702}
2703EXPORT_SYMBOL(compat_sock_common_setsockopt);
2704#endif
2705
1da177e4
LT		 2706void sk_common_release(struct sock *sk)
2707{
2708 if (sk->sk_prot->destroy)
2709 sk->sk_prot->destroy(sk);
2710
2711 /*
2712 * Observation: when sock_common_release is called, processes have
2713 * no access to socket. But net still has.
2714 * Step one, detach it from networking:
2715 *
2716 * A. Remove from hash tables.
2717 */
2718
2719 sk->sk_prot->unhash(sk);
2720
2721 /*
2722 * In this point socket cannot receive new packets, but it is possible
2723 * that some packets are in flight because some CPU runs receiver and
2724 * did hash table lookup before we unhashed socket. They will achieve
2725 * receive queue and will be purged by socket destructor.
2726 *
2727 * Also we still have packets pending on receive queue and probably,
2728 * our own packets waiting in device queues. sock_destroy will drain
2729 * receive queue, but transmitted packets will delay socket destruction
2730 * until the last reference will be released.
2731 */
2732
2733 sock_orphan(sk);
2734
2735 xfrm_sk_free_policy(sk);
2736
e6848976 2737 sk_refcnt_debug_release(sk);
5640f768
ED		 2738
2739 if (sk->sk_frag.page) {
2740 put_page(sk->sk_frag.page);
2741 sk->sk_frag.page = NULL;
2742 }
2743
1da177e4
LT		 2744 sock_put(sk);
2745}
1da177e4
LT		 2746EXPORT_SYMBOL(sk_common_release);
2747
13ff3d6f
PE		 2748#ifdef CONFIG_PROC_FS
2749#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2750struct prot_inuse {
2751 int val[PROTO_INUSE_NR];
2752};
13ff3d6f
PE		 2753
2754static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2755
2756#ifdef CONFIG_NET_NS
2757void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2758{
d6d9ca0f 2759 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2760}
2761EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2762
2763int sock_prot_inuse_get(struct net *net, struct proto *prot)
2764{
2765 int cpu, idx = prot->inuse_idx;
2766 int res = 0;
2767
2768 for_each_possible_cpu(cpu)
2769 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2770
2771 return res >= 0 ? res : 0;
2772}
2773EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2774
2c8c1e72 2775static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2776{
2777 net->core.inuse = alloc_percpu(struct prot_inuse);
2778 return net->core.inuse ? 0 : -ENOMEM;
2779}
2780
2c8c1e72 2781static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2782{
2783 free_percpu(net->core.inuse);
2784}
2785
2786static struct pernet_operations net_inuse_ops = {
2787 .init = sock_inuse_init_net,
2788 .exit = sock_inuse_exit_net,
2789};
2790
2791static __init int net_inuse_init(void)
2792{
2793 if (register_pernet_subsys(&net_inuse_ops))
2794 panic("Cannot initialize net inuse counters");
2795
2796 return 0;
2797}
2798
2799core_initcall(net_inuse_init);
2800#else
1338d466
PE		 2801static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2802
c29a0bc4 2803void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2804{
d6d9ca0f 2805 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2806}
2807EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2808
c29a0bc4 2809int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2810{
2811 int cpu, idx = prot->inuse_idx;
2812 int res = 0;
2813
2814 for_each_possible_cpu(cpu)
2815 res += per_cpu(prot_inuse, cpu).val[idx];
2816
2817 return res >= 0 ? res : 0;
2818}
2819EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2820#endif
13ff3d6f
PE		 2821
2822static void assign_proto_idx(struct proto *prot)
2823{
2824 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2825
2826 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2827 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2828 return;
2829 }
2830
2831 set_bit(prot->inuse_idx, proto_inuse_idx);
2832}
2833
2834static void release_proto_idx(struct proto *prot)
2835{
2836 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2837 clear_bit(prot->inuse_idx, proto_inuse_idx);
2838}
2839#else
2840static inline void assign_proto_idx(struct proto *prot)
2841{
2842}
2843
2844static inline void release_proto_idx(struct proto *prot)
2845{
2846}
2847#endif
2848
0159dfd3
ED		 2849static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2850{
2851 if (!rsk_prot)
2852 return;
2853 kfree(rsk_prot->slab_name);
2854 rsk_prot->slab_name = NULL;
adf78eda
JL		 2855 kmem_cache_destroy(rsk_prot->slab);
2856 rsk_prot->slab = NULL;
0159dfd3
ED		 2857}
2858
2859static int req_prot_init(const struct proto *prot)
2860{
2861 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2862
2863 if (!rsk_prot)
2864 return 0;
2865
2866 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2867 prot->name);
2868 if (!rsk_prot->slab_name)
2869 return -ENOMEM;
2870
2871 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2872 rsk_prot->obj_size, 0,
e96f78ab 2873 prot->slab_flags, NULL);
0159dfd3
ED		 2874
2875 if (!rsk_prot->slab) {
2876 pr_crit("%s: Can't create request sock SLAB cache!\n",
2877 prot->name);
2878 return -ENOMEM;
2879 }
2880 return 0;
2881}
2882
b733c007
PE		 2883int proto_register(struct proto *prot, int alloc_slab)
2884{
1da177e4
LT		 2885 if (alloc_slab) {
2886 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2887 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2888 NULL);
1da177e4
LT		 2889
2890 if (prot->slab == NULL) {
e005d193
JP		 2891 pr_crit("%s: Can't create sock SLAB cache!\n",
2892 prot->name);
60e7663d 2893 goto out;
1da177e4 2894 }
2e6599cb 2895
0159dfd3
ED		 2896 if (req_prot_init(prot))
2897 goto out_free_request_sock_slab;
8feaf0c0 2898
6d6ee43e 2899 if (prot->twsk_prot != NULL) {
faf23422 2900 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2901
7e56b5d6 2902 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2903 goto out_free_request_sock_slab;
2904
6d6ee43e 2905 prot->twsk_prot->twsk_slab =
7e56b5d6 2906 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2907 prot->twsk_prot->twsk_obj_size,
3ab5aee7 2908 0,
52db70dc 2909 prot->slab_flags,
20c2df83 2910 NULL);
6d6ee43e 2911 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2912 goto out_free_timewait_sock_slab_name;
2913 }
1da177e4
LT		 2914 }
2915
36b77a52 2916 mutex_lock(&proto_list_mutex);
1da177e4 2917 list_add(&prot->node, &proto_list);
13ff3d6f 2918 assign_proto_idx(prot);
36b77a52 2919 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2920 return 0;
2921
8feaf0c0 2922out_free_timewait_sock_slab_name:
7e56b5d6 2923 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 2924out_free_request_sock_slab:
0159dfd3
ED		 2925 req_prot_cleanup(prot->rsk_prot);
2926
2e6599cb
ACM		 2927 kmem_cache_destroy(prot->slab);
2928 prot->slab = NULL;
b733c007
PE		 2929out:
2930 return -ENOBUFS;
1da177e4 2931}
1da177e4
LT		 2932EXPORT_SYMBOL(proto_register);
2933
2934void proto_unregister(struct proto *prot)
2935{
36b77a52 2936 mutex_lock(&proto_list_mutex);
13ff3d6f 2937 release_proto_idx(prot);
0a3f4358 2938 list_del(&prot->node);
36b77a52 2939 mutex_unlock(&proto_list_mutex);
1da177e4 2940
adf78eda
JL		 2941 kmem_cache_destroy(prot->slab);
2942 prot->slab = NULL;
1da177e4 2943
0159dfd3 2944 req_prot_cleanup(prot->rsk_prot);
2e6599cb 2945
6d6ee43e 2946 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2947 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2948 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2949 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2950 }
1da177e4 2951}
1da177e4
LT		 2952EXPORT_SYMBOL(proto_unregister);
2953
2954#ifdef CONFIG_PROC_FS
1da177e4 2955static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2956 __acquires(proto_list_mutex)
1da177e4 2957{
36b77a52 2958 mutex_lock(&proto_list_mutex);
60f0438a 2959 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2960}
2961
2962static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2963{
60f0438a 2964 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2965}
2966
2967static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2968 __releases(proto_list_mutex)
1da177e4 2969{
36b77a52 2970 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2971}
2972
2973static char proto_method_implemented(const void *method)
2974{
2975 return method == NULL ? 'n' : 'y';
2976}
180d8cd9
GC		 2977static long sock_prot_memory_allocated(struct proto *proto)
2978{
cb75a36c 2979 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2980}
2981
2982static char *sock_prot_memory_pressure(struct proto *proto)
2983{
2984 return proto->memory_pressure != NULL ?
2985 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2986}
1da177e4
LT		 2987
2988static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2989{
180d8cd9 2990
8d987e5c 2991 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2992 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2993 proto->name,
2994 proto->obj_size,
14e943db 2995 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2996 sock_prot_memory_allocated(proto),
2997 sock_prot_memory_pressure(proto),
1da177e4
LT		 2998 proto->max_header,
2999 proto->slab == NULL ? "no" : "yes",
3000 module_name(proto->owner),
3001 proto_method_implemented(proto->close),
3002 proto_method_implemented(proto->connect),
3003 proto_method_implemented(proto->disconnect),
3004 proto_method_implemented(proto->accept),
3005 proto_method_implemented(proto->ioctl),
3006 proto_method_implemented(proto->init),
3007 proto_method_implemented(proto->destroy),
3008 proto_method_implemented(proto->shutdown),
3009 proto_method_implemented(proto->setsockopt),
3010 proto_method_implemented(proto->getsockopt),
3011 proto_method_implemented(proto->sendmsg),
3012 proto_method_implemented(proto->recvmsg),
3013 proto_method_implemented(proto->sendpage),
3014 proto_method_implemented(proto->bind),
3015 proto_method_implemented(proto->backlog_rcv),
3016 proto_method_implemented(proto->hash),
3017 proto_method_implemented(proto->unhash),
3018 proto_method_implemented(proto->get_port),
3019 proto_method_implemented(proto->enter_memory_pressure));
3020}
3021
3022static int proto_seq_show(struct seq_file *seq, void *v)
3023{
60f0438a 3024 if (v == &proto_list)
1da177e4
LT		 3025 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3026 "protocol",
3027 "size",
3028 "sockets",
3029 "memory",
3030 "press",
3031 "maxhdr",
3032 "slab",
3033 "module",
3034 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3035 else
60f0438a 3036 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 3037 return 0;
3038}
3039
f690808e 3040static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 3041 .start = proto_seq_start,
3042 .next = proto_seq_next,
3043 .stop = proto_seq_stop,
3044 .show = proto_seq_show,
3045};
3046
3047static int proto_seq_open(struct inode *inode, struct file *file)
3048{
14e943db
ED		 3049 return seq_open_net(inode, file, &proto_seq_ops,
3050 sizeof(struct seq_net_private));
1da177e4
LT		 3051}
3052
9a32144e 3053static const struct file_operations proto_seq_fops = {
1da177e4
LT		 3054 .owner = THIS_MODULE,
3055 .open = proto_seq_open,
3056 .read = seq_read,
3057 .llseek = seq_lseek,
14e943db
ED		 3058 .release = seq_release_net,
3059};
3060
3061static __net_init int proto_init_net(struct net *net)
3062{
d4beaa66 3063 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 3064 return -ENOMEM;
3065
3066 return 0;
3067}
3068
3069static __net_exit void proto_exit_net(struct net *net)
3070{
ece31ffd 3071 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 3072}
3073
3074
3075static __net_initdata struct pernet_operations proto_net_ops = {
3076 .init = proto_init_net,
3077 .exit = proto_exit_net,
1da177e4
LT		 3078};
3079
3080static int __init proto_init(void)
3081{
14e943db 3082 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 3083}
3084
3085subsys_initcall(proto_init);
3086
3087#endif /* PROC_FS */
ubuntu-bionic-kernel mirror