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vmxnet3: fix checks for dma mapping errors
[linux-2.6-block.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>
137
3847ce32
SM		 138#include <trace/events/sock.h>
139
1da177e4
LT		 140#ifdef CONFIG_INET
141#include <net/tcp.h>
142#endif
143
076bb0c8 144#include <net/busy_poll.h>
06021292 145
36b77a52 146static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 147static LIST_HEAD(proto_list);
148
a3b299da
EB		 149/**
150 * sk_ns_capable - General socket capability test
151 * @sk: Socket to use a capability on or through
152 * @user_ns: The user namespace of the capability to use
153 * @cap: The capability to use
154 *
155 * Test to see if the opener of the socket had when the socket was
156 * created and the current process has the capability @cap in the user
157 * namespace @user_ns.
158 */
159bool sk_ns_capable(const struct sock *sk,
160 struct user_namespace *user_ns, int cap)
161{
162 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
163 ns_capable(user_ns, cap);
164}
165EXPORT_SYMBOL(sk_ns_capable);
166
167/**
168 * sk_capable - Socket global capability test
169 * @sk: Socket to use a capability on or through
e793c0f7 170 * @cap: The global capability to use
a3b299da
EB		 171 *
172 * Test to see if the opener of the socket had when the socket was
173 * created and the current process has the capability @cap in all user
174 * namespaces.
175 */
176bool sk_capable(const struct sock *sk, int cap)
177{
178 return sk_ns_capable(sk, &init_user_ns, cap);
179}
180EXPORT_SYMBOL(sk_capable);
181
182/**
183 * sk_net_capable - Network namespace socket capability test
184 * @sk: Socket to use a capability on or through
185 * @cap: The capability to use
186 *
e793c0f7 187 * Test to see if the opener of the socket had when the socket was created
a3b299da
EB		 188 * and the current process has the capability @cap over the network namespace
189 * the socket is a member of.
190 */
191bool sk_net_capable(const struct sock *sk, int cap)
192{
193 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
194}
195EXPORT_SYMBOL(sk_net_capable);
196
197
c255a458 198#ifdef CONFIG_MEMCG_KMEM
1d62e436 199int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
d1a4c0b3
GC		 200{
201 struct proto *proto;
202 int ret = 0;
203
36b77a52 204 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 205 list_for_each_entry(proto, &proto_list, node) {
206 if (proto->init_cgroup) {
1d62e436 207 ret = proto->init_cgroup(memcg, ss);
d1a4c0b3
GC		 208 if (ret)
209 goto out;
210 }
211 }
212
36b77a52 213 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 214 return ret;
215out:
216 list_for_each_entry_continue_reverse(proto, &proto_list, node)
217 if (proto->destroy_cgroup)
1d62e436 218 proto->destroy_cgroup(memcg);
36b77a52 219 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 220 return ret;
221}
222
1d62e436 223void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
d1a4c0b3
GC		 224{
225 struct proto *proto;
226
36b77a52 227 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 228 list_for_each_entry_reverse(proto, &proto_list, node)
229 if (proto->destroy_cgroup)
1d62e436 230 proto->destroy_cgroup(memcg);
36b77a52 231 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 232}
233#endif
234
da21f24d
IM		 235/*
236 * Each address family might have different locking rules, so we have
237 * one slock key per address family:
238 */
a5b5bb9a
IM		 239static struct lock_class_key af_family_keys[AF_MAX];
240static struct lock_class_key af_family_slock_keys[AF_MAX];
241
cbda4eaf 242#if defined(CONFIG_MEMCG_KMEM)
c5905afb 243struct static_key memcg_socket_limit_enabled;
e1aab161 244EXPORT_SYMBOL(memcg_socket_limit_enabled);
cbda4eaf 245#endif
e1aab161 246
a5b5bb9a
IM		 247/*
248 * Make lock validator output more readable. (we pre-construct these
249 * strings build-time, so that runtime initialization of socket
250 * locks is fast):
251 */
36cbd3dc 252static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 253 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
254 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
255 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
256 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
257 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
258 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
259 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 260 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 261 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 262 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 263 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 264 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 265 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
456db6a4 266 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
a5b5bb9a 267};
36cbd3dc 268static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 269 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
270 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
271 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
272 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
273 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
274 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
275 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 276 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 277 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 278 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 279 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 280 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 281 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
456db6a4 282 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
a5b5bb9a 283};
36cbd3dc 284static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 285 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
286 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
287 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
288 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
289 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
290 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
291 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 292 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 293 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 294 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 295 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 296 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 297 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
456db6a4 298 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
443aef0e 299};
da21f24d
IM		 300
301/*
302 * sk_callback_lock locking rules are per-address-family,
303 * so split the lock classes by using a per-AF key:
304 */
305static struct lock_class_key af_callback_keys[AF_MAX];
306
1da177e4
LT		 307/* Take into consideration the size of the struct sk_buff overhead in the
308 * determination of these values, since that is non-constant across
309 * platforms. This makes socket queueing behavior and performance
310 * not depend upon such differences.
311 */
312#define _SK_MEM_PACKETS 256
87fb4b7b 313#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 314#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
315#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
316
317/* Run time adjustable parameters. */
ab32ea5d 318__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 319EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 320__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 321EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 322__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
323__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 324
25985edc 325/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 326int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 327EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 328
b245be1f
WB		 329int sysctl_tstamp_allow_data __read_mostly = 1;
330
c93bdd0e
MG		 331struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
332EXPORT_SYMBOL_GPL(memalloc_socks);
333
7cb02404
MG		 334/**
335 * sk_set_memalloc - sets %SOCK_MEMALLOC
336 * @sk: socket to set it on
337 *
338 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
339 * It's the responsibility of the admin to adjust min_free_kbytes
340 * to meet the requirements
341 */
342void sk_set_memalloc(struct sock *sk)
343{
344 sock_set_flag(sk, SOCK_MEMALLOC);
345 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 346 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 347}
348EXPORT_SYMBOL_GPL(sk_set_memalloc);
349
350void sk_clear_memalloc(struct sock *sk)
351{
352 sock_reset_flag(sk, SOCK_MEMALLOC);
353 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 354 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 355
356 /*
357 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
5d753610
MG		 358 * progress of swapping. SOCK_MEMALLOC may be cleared while
359 * it has rmem allocations due to the last swapfile being deactivated
360 * but there is a risk that the socket is unusable due to exceeding
361 * the rmem limits. Reclaim the reserves and obey rmem limits again.
c76562b6 362 */
5d753610 363 sk_mem_reclaim(sk);
7cb02404
MG		 364}
365EXPORT_SYMBOL_GPL(sk_clear_memalloc);
366
b4b9e355
MG		 367int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
368{
369 int ret;
370 unsigned long pflags = current->flags;
371
372 /* these should have been dropped before queueing */
373 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
374
375 current->flags |= PF_MEMALLOC;
376 ret = sk->sk_backlog_rcv(sk, skb);
377 tsk_restore_flags(current, pflags, PF_MEMALLOC);
378
379 return ret;
380}
381EXPORT_SYMBOL(__sk_backlog_rcv);
382
1da177e4
LT		 383static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
384{
385 struct timeval tv;
386
387 if (optlen < sizeof(tv))
388 return -EINVAL;
389 if (copy_from_user(&tv, optval, sizeof(tv)))
390 return -EFAULT;
ba78073e
VA		 391 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
392 return -EDOM;
1da177e4 393
ba78073e 394 if (tv.tv_sec < 0) {
6f11df83
AM		 395 static int warned __read_mostly;
396
ba78073e 397 *timeo_p = 0;
50aab54f 398 if (warned < 10 && net_ratelimit()) {
ba78073e 399 warned++;
e005d193
JP		 400 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
401 __func__, current->comm, task_pid_nr(current));
50aab54f 402 }
ba78073e
VA		 403 return 0;
404 }
1da177e4
LT		 405 *timeo_p = MAX_SCHEDULE_TIMEOUT;
406 if (tv.tv_sec == 0 && tv.tv_usec == 0)
407 return 0;
408 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
409 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
410 return 0;
411}
412
413static void sock_warn_obsolete_bsdism(const char *name)
414{
415 static int warned;
416 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 417 if (strcmp(warncomm, current->comm) && warned < 5) {
418 strcpy(warncomm, current->comm);
e005d193
JP		 419 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
420 warncomm, name);
1da177e4
LT		 421 warned++;
422 }
423}
424
080a270f
HFS		 425static bool sock_needs_netstamp(const struct sock *sk)
426{
427 switch (sk->sk_family) {
428 case AF_UNSPEC:
429 case AF_UNIX:
430 return false;
431 default:
432 return true;
433 }
434}
435
08e29af3
ED		 436#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
437
438static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 439{
08e29af3
ED		 440 if (sk->sk_flags & flags) {
441 sk->sk_flags &= ~flags;
080a270f
HFS		 442 if (sock_needs_netstamp(sk) &&
443 !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 444 net_disable_timestamp();
1da177e4
LT		 445 }
446}
447
448
f0088a50
DV		 449int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
450{
766e9037 451 int err;
3b885787
NH		 452 unsigned long flags;
453 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 454
0fd7bac6 455 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 456 atomic_inc(&sk->sk_drops);
3847ce32 457 trace_sock_rcvqueue_full(sk, skb);
766e9037 458 return -ENOMEM;
f0088a50
DV		 459 }
460
fda9ef5d 461 err = sk_filter(sk, skb);
f0088a50 462 if (err)
766e9037 463 return err;
f0088a50 464
c76562b6 465 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 466 atomic_inc(&sk->sk_drops);
467 return -ENOBUFS;
3ab224be
HA		 468 }
469
f0088a50
DV		 470 skb->dev = NULL;
471 skb_set_owner_r(skb, sk);
49ad9599 472
7fee226a
ED		 473 /* we escape from rcu protected region, make sure we dont leak
474 * a norefcounted dst
475 */
476 skb_dst_force(skb);
477
3b885787 478 spin_lock_irqsave(&list->lock, flags);
3bc3b96f 479 sock_skb_set_dropcount(sk, skb);
3b885787
NH		 480 __skb_queue_tail(list, skb);
481 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 482
483 if (!sock_flag(sk, SOCK_DEAD))
676d2369 484 sk->sk_data_ready(sk);
766e9037 485 return 0;
f0088a50
DV		 486}
487EXPORT_SYMBOL(sock_queue_rcv_skb);
488
58a5a7b9 489int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 490{
491 int rc = NET_RX_SUCCESS;
492
fda9ef5d 493 if (sk_filter(sk, skb))
f0088a50
DV		 494 goto discard_and_relse;
495
496 skb->dev = NULL;
497
274f482d 498 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 499 atomic_inc(&sk->sk_drops);
500 goto discard_and_relse;
501 }
58a5a7b9
ACM		 502 if (nested)
503 bh_lock_sock_nested(sk);
504 else
505 bh_lock_sock(sk);
a5b5bb9a
IM		 506 if (!sock_owned_by_user(sk)) {
507 /*
508 * trylock + unlock semantics:
509 */
510 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
511
c57943a1 512 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 513
514 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 515 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 516 bh_unlock_sock(sk);
517 atomic_inc(&sk->sk_drops);
518 goto discard_and_relse;
519 }
520
f0088a50
DV		 521 bh_unlock_sock(sk);
522out:
523 sock_put(sk);
524 return rc;
525discard_and_relse:
526 kfree_skb(skb);
527 goto out;
528}
529EXPORT_SYMBOL(sk_receive_skb);
530
531struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
532{
b6c6712a 533 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 534
535 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 536 sk_tx_queue_clear(sk);
a9b3cd7f 537 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 538 dst_release(dst);
539 return NULL;
540 }
541
542 return dst;
543}
544EXPORT_SYMBOL(__sk_dst_check);
545
546struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
547{
548 struct dst_entry *dst = sk_dst_get(sk);
549
550 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
551 sk_dst_reset(sk);
552 dst_release(dst);
553 return NULL;
554 }
555
556 return dst;
557}
558EXPORT_SYMBOL(sk_dst_check);
559
c91f6df2
BH		 560static int sock_setbindtodevice(struct sock *sk, char __user *optval,
561 int optlen)
4878809f
DM		 562{
563 int ret = -ENOPROTOOPT;
564#ifdef CONFIG_NETDEVICES
3b1e0a65 565 struct net *net = sock_net(sk);
4878809f
DM		 566 char devname[IFNAMSIZ];
567 int index;
568
569 /* Sorry... */
570 ret = -EPERM;
5e1fccc0 571 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 572 goto out;
573
574 ret = -EINVAL;
575 if (optlen < 0)
576 goto out;
577
578 /* Bind this socket to a particular device like "eth0",
579 * as specified in the passed interface name. If the
580 * name is "" or the option length is zero the socket
581 * is not bound.
582 */
583 if (optlen > IFNAMSIZ - 1)
584 optlen = IFNAMSIZ - 1;
585 memset(devname, 0, sizeof(devname));
586
587 ret = -EFAULT;
588 if (copy_from_user(devname, optval, optlen))
589 goto out;
590
000ba2e4
DM		 591 index = 0;
592 if (devname[0] != '\0') {
bf8e56bf 593 struct net_device *dev;
4878809f 594
bf8e56bf
ED		 595 rcu_read_lock();
596 dev = dev_get_by_name_rcu(net, devname);
597 if (dev)
598 index = dev->ifindex;
599 rcu_read_unlock();
4878809f
DM		 600 ret = -ENODEV;
601 if (!dev)
602 goto out;
4878809f
DM		 603 }
604
605 lock_sock(sk);
606 sk->sk_bound_dev_if = index;
607 sk_dst_reset(sk);
608 release_sock(sk);
609
610 ret = 0;
611
612out:
613#endif
614
615 return ret;
616}
617
c91f6df2
BH		 618static int sock_getbindtodevice(struct sock *sk, char __user *optval,
619 int __user *optlen, int len)
620{
621 int ret = -ENOPROTOOPT;
622#ifdef CONFIG_NETDEVICES
623 struct net *net = sock_net(sk);
c91f6df2 624 char devname[IFNAMSIZ];
c91f6df2
BH		 625
626 if (sk->sk_bound_dev_if == 0) {
627 len = 0;
628 goto zero;
629 }
630
631 ret = -EINVAL;
632 if (len < IFNAMSIZ)
633 goto out;
634
5dbe7c17
NS		 635 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
636 if (ret)
c91f6df2 637 goto out;
c91f6df2
BH		 638
639 len = strlen(devname) + 1;
640
641 ret = -EFAULT;
642 if (copy_to_user(optval, devname, len))
643 goto out;
644
645zero:
646 ret = -EFAULT;
647 if (put_user(len, optlen))
648 goto out;
649
650 ret = 0;
651
652out:
653#endif
654
655 return ret;
656}
657
c0ef877b
PE		 658static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
659{
660 if (valbool)
661 sock_set_flag(sk, bit);
662 else
663 sock_reset_flag(sk, bit);
664}
665
f60e5990 666bool sk_mc_loop(struct sock *sk)
667{
668 if (dev_recursion_level())
669 return false;
670 if (!sk)
671 return true;
672 switch (sk->sk_family) {
673 case AF_INET:
674 return inet_sk(sk)->mc_loop;
675#if IS_ENABLED(CONFIG_IPV6)
676 case AF_INET6:
677 return inet6_sk(sk)->mc_loop;
678#endif
679 }
680 WARN_ON(1);
681 return true;
682}
683EXPORT_SYMBOL(sk_mc_loop);
684
1da177e4
LT		 685/*
686 * This is meant for all protocols to use and covers goings on
687 * at the socket level. Everything here is generic.
688 */
689
690int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 691 char __user *optval, unsigned int optlen)
1da177e4 692{
2a91525c 693 struct sock *sk = sock->sk;
1da177e4
LT		 694 int val;
695 int valbool;
696 struct linger ling;
697 int ret = 0;
4ec93edb 698
1da177e4
LT		 699 /*
700 * Options without arguments
701 */
702
4878809f 703 if (optname == SO_BINDTODEVICE)
c91f6df2 704 return sock_setbindtodevice(sk, optval, optlen);
4878809f 705
e71a4783
SH		 706 if (optlen < sizeof(int))
707 return -EINVAL;
4ec93edb 708
1da177e4
LT		 709 if (get_user(val, (int __user *)optval))
710 return -EFAULT;
4ec93edb 711
2a91525c 712 valbool = val ? 1 : 0;
1da177e4
LT		 713
714 lock_sock(sk);
715
2a91525c 716 switch (optname) {
e71a4783 717 case SO_DEBUG:
2a91525c 718 if (val && !capable(CAP_NET_ADMIN))
e71a4783 719 ret = -EACCES;
2a91525c 720 else
c0ef877b 721 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 722 break;
723 case SO_REUSEADDR:
4a17fd52 724 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 725 break;
055dc21a
TH		 726 case SO_REUSEPORT:
727 sk->sk_reuseport = valbool;
728 break;
e71a4783 729 case SO_TYPE:
49c794e9 730 case SO_PROTOCOL:
0d6038ee 731 case SO_DOMAIN:
e71a4783
SH		 732 case SO_ERROR:
733 ret = -ENOPROTOOPT;
734 break;
735 case SO_DONTROUTE:
c0ef877b 736 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 737 break;
738 case SO_BROADCAST:
739 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
740 break;
741 case SO_SNDBUF:
742 /* Don't error on this BSD doesn't and if you think
82981930
ED		 743 * about it this is right. Otherwise apps have to
744 * play 'guess the biggest size' games. RCVBUF/SNDBUF
745 * are treated in BSD as hints
746 */
747 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 748set_sndbuf:
e71a4783 749 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 750 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
751 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 752 sk->sk_write_space(sk);
753 break;
1da177e4 754
e71a4783
SH		 755 case SO_SNDBUFFORCE:
756 if (!capable(CAP_NET_ADMIN)) {
757 ret = -EPERM;
758 break;
759 }
760 goto set_sndbuf;
b0573dea 761
e71a4783
SH		 762 case SO_RCVBUF:
763 /* Don't error on this BSD doesn't and if you think
82981930
ED		 764 * about it this is right. Otherwise apps have to
765 * play 'guess the biggest size' games. RCVBUF/SNDBUF
766 * are treated in BSD as hints
767 */
768 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 769set_rcvbuf:
e71a4783
SH		 770 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
771 /*
772 * We double it on the way in to account for
773 * "struct sk_buff" etc. overhead. Applications
774 * assume that the SO_RCVBUF setting they make will
775 * allow that much actual data to be received on that
776 * socket.
777 *
778 * Applications are unaware that "struct sk_buff" and
779 * other overheads allocate from the receive buffer
780 * during socket buffer allocation.
781 *
782 * And after considering the possible alternatives,
783 * returning the value we actually used in getsockopt
784 * is the most desirable behavior.
785 */
82981930 786 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 787 break;
788
789 case SO_RCVBUFFORCE:
790 if (!capable(CAP_NET_ADMIN)) {
791 ret = -EPERM;
1da177e4 792 break;
e71a4783
SH		 793 }
794 goto set_rcvbuf;
1da177e4 795
e71a4783 796 case SO_KEEPALIVE:
1da177e4 797#ifdef CONFIG_INET
3e10986d
ED		 798 if (sk->sk_protocol == IPPROTO_TCP &&
799 sk->sk_type == SOCK_STREAM)
e71a4783 800 tcp_set_keepalive(sk, valbool);
1da177e4 801#endif
e71a4783
SH		 802 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
803 break;
804
805 case SO_OOBINLINE:
806 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
807 break;
808
809 case SO_NO_CHECK:
28448b80 810 sk->sk_no_check_tx = valbool;
e71a4783
SH		 811 break;
812
813 case SO_PRIORITY:
5e1fccc0
EB		 814 if ((val >= 0 && val <= 6) ||
815 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 816 sk->sk_priority = val;
817 else
818 ret = -EPERM;
819 break;
820
821 case SO_LINGER:
822 if (optlen < sizeof(ling)) {
823 ret = -EINVAL; /* 1003.1g */
1da177e4 824 break;
e71a4783 825 }
2a91525c 826 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 827 ret = -EFAULT;
1da177e4 828 break;
e71a4783
SH		 829 }
830 if (!ling.l_onoff)
831 sock_reset_flag(sk, SOCK_LINGER);
832 else {
1da177e4 833#if (BITS_PER_LONG == 32)
e71a4783
SH		 834 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
835 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 836 else
e71a4783
SH		 837#endif
838 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
839 sock_set_flag(sk, SOCK_LINGER);
840 }
841 break;
842
843 case SO_BSDCOMPAT:
844 sock_warn_obsolete_bsdism("setsockopt");
845 break;
846
847 case SO_PASSCRED:
848 if (valbool)
849 set_bit(SOCK_PASSCRED, &sock->flags);
850 else
851 clear_bit(SOCK_PASSCRED, &sock->flags);
852 break;
853
854 case SO_TIMESTAMP:
92f37fd2 855 case SO_TIMESTAMPNS:
e71a4783 856 if (valbool) {
92f37fd2
ED		 857 if (optname == SO_TIMESTAMP)
858 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
859 else
860 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 861 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 862 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 863 } else {
e71a4783 864 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 865 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
866 }
e71a4783
SH		 867 break;
868
20d49473
PO		 869 case SO_TIMESTAMPING:
870 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 871 ret = -EINVAL;
20d49473
PO		 872 break;
873 }
b245be1f 874
09c2d251 875 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765
WB		 876 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
877 if (sk->sk_protocol == IPPROTO_TCP) {
878 if (sk->sk_state != TCP_ESTABLISHED) {
879 ret = -EINVAL;
880 break;
881 }
882 sk->sk_tskey = tcp_sk(sk)->snd_una;
883 } else {
884 sk->sk_tskey = 0;
885 }
886 }
b9f40e21 887 sk->sk_tsflags = val;
20d49473
PO		 888 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
889 sock_enable_timestamp(sk,
890 SOCK_TIMESTAMPING_RX_SOFTWARE);
891 else
892 sock_disable_timestamp(sk,
08e29af3 893 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 894 break;
895
e71a4783
SH		 896 case SO_RCVLOWAT:
897 if (val < 0)
898 val = INT_MAX;
899 sk->sk_rcvlowat = val ? : 1;
900 break;
901
902 case SO_RCVTIMEO:
903 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
904 break;
905
906 case SO_SNDTIMEO:
907 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
908 break;
1da177e4 909
e71a4783
SH		 910 case SO_ATTACH_FILTER:
911 ret = -EINVAL;
912 if (optlen == sizeof(struct sock_fprog)) {
913 struct sock_fprog fprog;
1da177e4 914
e71a4783
SH		 915 ret = -EFAULT;
916 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 917 break;
e71a4783
SH		 918
919 ret = sk_attach_filter(&fprog, sk);
920 }
921 break;
922
89aa0758
AS		 923 case SO_ATTACH_BPF:
924 ret = -EINVAL;
925 if (optlen == sizeof(u32)) {
926 u32 ufd;
927
928 ret = -EFAULT;
929 if (copy_from_user(&ufd, optval, sizeof(ufd)))
930 break;
931
932 ret = sk_attach_bpf(ufd, sk);
933 }
934 break;
935
e71a4783 936 case SO_DETACH_FILTER:
55b33325 937 ret = sk_detach_filter(sk);
e71a4783 938 break;
1da177e4 939
d59577b6
VB		 940 case SO_LOCK_FILTER:
941 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
942 ret = -EPERM;
943 else
944 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
945 break;
946
e71a4783
SH		 947 case SO_PASSSEC:
948 if (valbool)
949 set_bit(SOCK_PASSSEC, &sock->flags);
950 else
951 clear_bit(SOCK_PASSSEC, &sock->flags);
952 break;
4a19ec58 953 case SO_MARK:
5e1fccc0 954 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 955 ret = -EPERM;
2a91525c 956 else
4a19ec58 957 sk->sk_mark = val;
4a19ec58 958 break;
877ce7c1 959
3b885787 960 case SO_RXQ_OVFL:
8083f0fc 961 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 962 break;
6e3e939f
JB		 963
964 case SO_WIFI_STATUS:
965 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
966 break;
967
ef64a54f
PE		 968 case SO_PEEK_OFF:
969 if (sock->ops->set_peek_off)
12663bfc 970 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 971 else
972 ret = -EOPNOTSUPP;
973 break;
3bdc0eba
BG		 974
975 case SO_NOFCS:
976 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
977 break;
978
7d4c04fc
KJ		 979 case SO_SELECT_ERR_QUEUE:
980 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
981 break;
982
e0d1095a 983#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 984 case SO_BUSY_POLL:
dafcc438
ET		 985 /* allow unprivileged users to decrease the value */
986 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
987 ret = -EPERM;
988 else {
989 if (val < 0)
990 ret = -EINVAL;
991 else
992 sk->sk_ll_usec = val;
993 }
994 break;
995#endif
62748f32
ED		 996
997 case SO_MAX_PACING_RATE:
998 sk->sk_max_pacing_rate = val;
999 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
1000 sk->sk_max_pacing_rate);
1001 break;
1002
70da268b
ED		 1003 case SO_INCOMING_CPU:
1004 sk->sk_incoming_cpu = val;
1005 break;
1006
e71a4783
SH		 1007 default:
1008 ret = -ENOPROTOOPT;
1009 break;
4ec93edb 1010 }
1da177e4
LT		 1011 release_sock(sk);
1012 return ret;
1013}
2a91525c 1014EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 1015
1016
8f09898b 1017static void cred_to_ucred(struct pid *pid, const struct cred *cred,
1018 struct ucred *ucred)
3f551f94
EB		 1019{
1020 ucred->pid = pid_vnr(pid);
1021 ucred->uid = ucred->gid = -1;
1022 if (cred) {
1023 struct user_namespace *current_ns = current_user_ns();
1024
b2e4f544
EB		 1025 ucred->uid = from_kuid_munged(current_ns, cred->euid);
1026 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 1027 }
1028}
1029
1da177e4
LT		 1030int sock_getsockopt(struct socket *sock, int level, int optname,
1031 char __user *optval, int __user *optlen)
1032{
1033 struct sock *sk = sock->sk;
4ec93edb 1034
e71a4783 1035 union {
4ec93edb
YH		 1036 int val;
1037 struct linger ling;
1da177e4
LT		 1038 struct timeval tm;
1039 } v;
4ec93edb 1040
4d0392be 1041 int lv = sizeof(int);
1da177e4 1042 int len;
4ec93edb 1043
e71a4783 1044 if (get_user(len, optlen))
4ec93edb 1045 return -EFAULT;
e71a4783 1046 if (len < 0)
1da177e4 1047 return -EINVAL;
4ec93edb 1048
50fee1de 1049 memset(&v, 0, sizeof(v));
df0bca04 1050
2a91525c 1051 switch (optname) {
e71a4783
SH		 1052 case SO_DEBUG:
1053 v.val = sock_flag(sk, SOCK_DBG);
1054 break;
1055
1056 case SO_DONTROUTE:
1057 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1058 break;
1059
1060 case SO_BROADCAST:
1b23a5df 1061 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1062 break;
1063
1064 case SO_SNDBUF:
1065 v.val = sk->sk_sndbuf;
1066 break;
1067
1068 case SO_RCVBUF:
1069 v.val = sk->sk_rcvbuf;
1070 break;
1071
1072 case SO_REUSEADDR:
1073 v.val = sk->sk_reuse;
1074 break;
1075
055dc21a
TH		 1076 case SO_REUSEPORT:
1077 v.val = sk->sk_reuseport;
1078 break;
1079
e71a4783 1080 case SO_KEEPALIVE:
1b23a5df 1081 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1082 break;
1083
1084 case SO_TYPE:
1085 v.val = sk->sk_type;
1086 break;
1087
49c794e9
JE		 1088 case SO_PROTOCOL:
1089 v.val = sk->sk_protocol;
1090 break;
1091
0d6038ee
JE		 1092 case SO_DOMAIN:
1093 v.val = sk->sk_family;
1094 break;
1095
e71a4783
SH		 1096 case SO_ERROR:
1097 v.val = -sock_error(sk);
2a91525c 1098 if (v.val == 0)
e71a4783
SH		 1099 v.val = xchg(&sk->sk_err_soft, 0);
1100 break;
1101
1102 case SO_OOBINLINE:
1b23a5df 1103 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1104 break;
1105
1106 case SO_NO_CHECK:
28448b80 1107 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1108 break;
1109
1110 case SO_PRIORITY:
1111 v.val = sk->sk_priority;
1112 break;
1113
1114 case SO_LINGER:
1115 lv = sizeof(v.ling);
1b23a5df 1116 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1117 v.ling.l_linger = sk->sk_lingertime / HZ;
1118 break;
1119
1120 case SO_BSDCOMPAT:
1121 sock_warn_obsolete_bsdism("getsockopt");
1122 break;
1123
1124 case SO_TIMESTAMP:
92f37fd2
ED		 1125 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1126 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1127 break;
1128
1129 case SO_TIMESTAMPNS:
1130 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1131 break;
1132
20d49473 1133 case SO_TIMESTAMPING:
b9f40e21 1134 v.val = sk->sk_tsflags;
20d49473
PO		 1135 break;
1136
e71a4783 1137 case SO_RCVTIMEO:
2a91525c 1138 lv = sizeof(struct timeval);
e71a4783
SH		 1139 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1140 v.tm.tv_sec = 0;
1141 v.tm.tv_usec = 0;
1142 } else {
1143 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1144 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1145 }
1146 break;
1147
1148 case SO_SNDTIMEO:
2a91525c 1149 lv = sizeof(struct timeval);
e71a4783
SH		 1150 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1151 v.tm.tv_sec = 0;
1152 v.tm.tv_usec = 0;
1153 } else {
1154 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1155 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1156 }
1157 break;
1da177e4 1158
e71a4783
SH		 1159 case SO_RCVLOWAT:
1160 v.val = sk->sk_rcvlowat;
1161 break;
1da177e4 1162
e71a4783 1163 case SO_SNDLOWAT:
2a91525c 1164 v.val = 1;
e71a4783 1165 break;
1da177e4 1166
e71a4783 1167 case SO_PASSCRED:
82981930 1168 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1169 break;
1da177e4 1170
e71a4783 1171 case SO_PEERCRED:
109f6e39
EB		 1172 {
1173 struct ucred peercred;
1174 if (len > sizeof(peercred))
1175 len = sizeof(peercred);
1176 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1177 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1178 return -EFAULT;
1179 goto lenout;
109f6e39 1180 }
1da177e4 1181
e71a4783
SH		 1182 case SO_PEERNAME:
1183 {
1184 char address[128];
1185
1186 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1187 return -ENOTCONN;
1188 if (lv < len)
1189 return -EINVAL;
1190 if (copy_to_user(optval, address, len))
1191 return -EFAULT;
1192 goto lenout;
1193 }
1da177e4 1194
e71a4783
SH		 1195 /* Dubious BSD thing... Probably nobody even uses it, but
1196 * the UNIX standard wants it for whatever reason... -DaveM
1197 */
1198 case SO_ACCEPTCONN:
1199 v.val = sk->sk_state == TCP_LISTEN;
1200 break;
1da177e4 1201
e71a4783 1202 case SO_PASSSEC:
82981930 1203 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1204 break;
877ce7c1 1205
e71a4783
SH		 1206 case SO_PEERSEC:
1207 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1208
4a19ec58
LAT		 1209 case SO_MARK:
1210 v.val = sk->sk_mark;
1211 break;
1212
3b885787 1213 case SO_RXQ_OVFL:
1b23a5df 1214 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1215 break;
1216
6e3e939f 1217 case SO_WIFI_STATUS:
1b23a5df 1218 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1219 break;
1220
ef64a54f
PE		 1221 case SO_PEEK_OFF:
1222 if (!sock->ops->set_peek_off)
1223 return -EOPNOTSUPP;
1224
1225 v.val = sk->sk_peek_off;
1226 break;
bc2f7996 1227 case SO_NOFCS:
1b23a5df 1228 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1229 break;
c91f6df2 1230
f7b86bfe 1231 case SO_BINDTODEVICE:
c91f6df2
BH		 1232 return sock_getbindtodevice(sk, optval, optlen, len);
1233
a8fc9277
PE		 1234 case SO_GET_FILTER:
1235 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1236 if (len < 0)
1237 return len;
1238
1239 goto lenout;
c91f6df2 1240
d59577b6
VB		 1241 case SO_LOCK_FILTER:
1242 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1243 break;
1244
ea02f941
MS		 1245 case SO_BPF_EXTENSIONS:
1246 v.val = bpf_tell_extensions();
1247 break;
1248
7d4c04fc
KJ		 1249 case SO_SELECT_ERR_QUEUE:
1250 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1251 break;
1252
e0d1095a 1253#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1254 case SO_BUSY_POLL:
dafcc438
ET		 1255 v.val = sk->sk_ll_usec;
1256 break;
1257#endif
1258
62748f32
ED		 1259 case SO_MAX_PACING_RATE:
1260 v.val = sk->sk_max_pacing_rate;
1261 break;
1262
2c8c56e1
ED		 1263 case SO_INCOMING_CPU:
1264 v.val = sk->sk_incoming_cpu;
1265 break;
1266
e71a4783 1267 default:
443b5991
YH		 1268 /* We implement the SO_SNDLOWAT etc to not be settable
1269 * (1003.1g 7).
1270 */
e71a4783 1271 return -ENOPROTOOPT;
1da177e4 1272 }
e71a4783 1273
1da177e4
LT		 1274 if (len > lv)
1275 len = lv;
1276 if (copy_to_user(optval, &v, len))
1277 return -EFAULT;
1278lenout:
4ec93edb
YH		 1279 if (put_user(len, optlen))
1280 return -EFAULT;
1281 return 0;
1da177e4
LT		 1282}
1283
a5b5bb9a
IM		 1284/*
1285 * Initialize an sk_lock.
1286 *
1287 * (We also register the sk_lock with the lock validator.)
1288 */
b6f99a21 1289static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1290{
ed07536e
PZ		 1291 sock_lock_init_class_and_name(sk,
1292 af_family_slock_key_strings[sk->sk_family],
1293 af_family_slock_keys + sk->sk_family,
1294 af_family_key_strings[sk->sk_family],
1295 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1296}
1297
4dc6dc71
ED		 1298/*
1299 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1300 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1301 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1302 */
f1a6c4da
PE		 1303static void sock_copy(struct sock *nsk, const struct sock *osk)
1304{
1305#ifdef CONFIG_SECURITY_NETWORK
1306 void *sptr = nsk->sk_security;
1307#endif
68835aba
ED		 1308 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1309
1310 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1311 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1312
f1a6c4da
PE		 1313#ifdef CONFIG_SECURITY_NETWORK
1314 nsk->sk_security = sptr;
1315 security_sk_clone(osk, nsk);
1316#endif
1317}
1318
fcbdf09d
OP		 1319void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1320{
1321 unsigned long nulls1, nulls2;
1322
1323 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1324 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1325 if (nulls1 > nulls2)
1326 swap(nulls1, nulls2);
1327
1328 if (nulls1 != 0)
1329 memset((char *)sk, 0, nulls1);
1330 memset((char *)sk + nulls1 + sizeof(void *), 0,
1331 nulls2 - nulls1 - sizeof(void *));
1332 memset((char *)sk + nulls2 + sizeof(void *), 0,
1333 size - nulls2 - sizeof(void *));
1334}
1335EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1336
2e4afe7b
PE		 1337static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1338 int family)
c308c1b2
PE		 1339{
1340 struct sock *sk;
1341 struct kmem_cache *slab;
1342
1343 slab = prot->slab;
e912b114
ED		 1344 if (slab != NULL) {
1345 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1346 if (!sk)
1347 return sk;
1348 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1349 if (prot->clear_sk)
1350 prot->clear_sk(sk, prot->obj_size);
1351 else
1352 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1353 }
fcbdf09d 1354 } else
c308c1b2
PE		 1355 sk = kmalloc(prot->obj_size, priority);
1356
2e4afe7b 1357 if (sk != NULL) {
a98b65a3
VN		 1358 kmemcheck_annotate_bitfield(sk, flags);
1359
2e4afe7b
PE		 1360 if (security_sk_alloc(sk, family, priority))
1361 goto out_free;
1362
1363 if (!try_module_get(prot->owner))
1364 goto out_free_sec;
e022f0b4 1365 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1366 }
1367
c308c1b2 1368 return sk;
2e4afe7b
PE		 1369
1370out_free_sec:
1371 security_sk_free(sk);
1372out_free:
1373 if (slab != NULL)
1374 kmem_cache_free(slab, sk);
1375 else
1376 kfree(sk);
1377 return NULL;
c308c1b2
PE		 1378}
1379
1380static void sk_prot_free(struct proto *prot, struct sock *sk)
1381{
1382 struct kmem_cache *slab;
2e4afe7b 1383 struct module *owner;
c308c1b2 1384
2e4afe7b 1385 owner = prot->owner;
c308c1b2 1386 slab = prot->slab;
2e4afe7b
PE		 1387
1388 security_sk_free(sk);
c308c1b2
PE		 1389 if (slab != NULL)
1390 kmem_cache_free(slab, sk);
1391 else
1392 kfree(sk);
2e4afe7b 1393 module_put(owner);
c308c1b2
PE		 1394}
1395
86f8515f 1396#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
6ffd4641 1397void sock_update_netprioidx(struct sock *sk)
5bc1421e 1398{
5bc1421e
NH		 1399 if (in_interrupt())
1400 return;
2b73bc65 1401
6ffd4641 1402 sk->sk_cgrp_prioidx = task_netprioidx(current);
5bc1421e
NH		 1403}
1404EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1405#endif
1406
1da177e4
LT		 1407/**
1408 * sk_alloc - All socket objects are allocated here
c4ea43c5 1409 * @net: the applicable net namespace
4dc3b16b
PP		 1410 * @family: protocol family
1411 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1412 * @prot: struct proto associated with this new sock instance
11aa9c28 1413 * @kern: is this to be a kernel socket?
1da177e4 1414 */
1b8d7ae4 1415struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
11aa9c28 1416 struct proto *prot, int kern)
1da177e4 1417{
c308c1b2 1418 struct sock *sk;
1da177e4 1419
154adbc8 1420 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1421 if (sk) {
154adbc8
PE		 1422 sk->sk_family = family;
1423 /*
1424 * See comment in struct sock definition to understand
1425 * why we need sk_prot_creator -acme
1426 */
1427 sk->sk_prot = sk->sk_prot_creator = prot;
1428 sock_lock_init(sk);
26abe143
EB		 1429 sk->sk_net_refcnt = kern ? 0 : 1;
1430 if (likely(sk->sk_net_refcnt))
1431 get_net(net);
1432 sock_net_set(sk, net);
d66ee058 1433 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1434
211d2f97 1435 sock_update_classid(sk);
6ffd4641 1436 sock_update_netprioidx(sk);
1da177e4 1437 }
a79af59e 1438
2e4afe7b 1439 return sk;
1da177e4 1440}
2a91525c 1441EXPORT_SYMBOL(sk_alloc);
1da177e4 1442
eb4cb008 1443void sk_destruct(struct sock *sk)
1da177e4
LT		 1444{
1445 struct sk_filter *filter;
1da177e4
LT		 1446
1447 if (sk->sk_destruct)
1448 sk->sk_destruct(sk);
1449
a898def2
PM		 1450 filter = rcu_dereference_check(sk->sk_filter,
1451 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1452 if (filter) {
309dd5fc 1453 sk_filter_uncharge(sk, filter);
a9b3cd7f 1454 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1455 }
1456
08e29af3 1457 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1458
1459 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1460 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1461 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1462
109f6e39
EB		 1463 if (sk->sk_peer_cred)
1464 put_cred(sk->sk_peer_cred);
1465 put_pid(sk->sk_peer_pid);
26abe143
EB		 1466 if (likely(sk->sk_net_refcnt))
1467 put_net(sock_net(sk));
c308c1b2 1468 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1469}
2b85a34e 1470
eb4cb008
CG		 1471static void __sk_free(struct sock *sk)
1472{
b922622e 1473 if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt))
eb4cb008
CG		 1474 sock_diag_broadcast_destroy(sk);
1475 else
1476 sk_destruct(sk);
1477}
1478
2b85a34e
ED		 1479void sk_free(struct sock *sk)
1480{
1481 /*
25985edc 1482 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1483 * some packets are still in some tx queue.
1484 * If not null, sock_wfree() will call __sk_free(sk) later
1485 */
1486 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1487 __sk_free(sk);
1488}
2a91525c 1489EXPORT_SYMBOL(sk_free);
1da177e4 1490
475f1b52
SR		 1491static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1492{
1493 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1494 sock_update_memcg(newsk);
1495}
1496
e56c57d0
ED		 1497/**
1498 * sk_clone_lock - clone a socket, and lock its clone
1499 * @sk: the socket to clone
1500 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1501 *
1502 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1503 */
1504struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1505{
8fd1d178 1506 struct sock *newsk;
278571ba 1507 bool is_charged = true;
87d11ceb 1508
8fd1d178 1509 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1510 if (newsk != NULL) {
1511 struct sk_filter *filter;
1512
892c141e 1513 sock_copy(newsk, sk);
87d11ceb
ACM		 1514
1515 /* SANITY */
8a681736
SV		 1516 if (likely(newsk->sk_net_refcnt))
1517 get_net(sock_net(newsk));
87d11ceb
ACM		 1518 sk_node_init(&newsk->sk_node);
1519 sock_lock_init(newsk);
1520 bh_lock_sock(newsk);
fa438ccf 1521 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1522 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1523
1524 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1525 /*
1526 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1527 */
1528 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1529 atomic_set(&newsk->sk_omem_alloc, 0);
1530 skb_queue_head_init(&newsk->sk_receive_queue);
1531 skb_queue_head_init(&newsk->sk_write_queue);
1532
b6c6712a 1533 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1534 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1535 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1536 af_callback_keys + newsk->sk_family,
1537 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1538
1539 newsk->sk_dst_cache = NULL;
1540 newsk->sk_wmem_queued = 0;
1541 newsk->sk_forward_alloc = 0;
1542 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1543 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1544
1545 sock_reset_flag(newsk, SOCK_DONE);
1546 skb_queue_head_init(&newsk->sk_error_queue);
1547
0d7da9dd 1548 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1549 if (filter != NULL)
278571ba
AS		 1550 /* though it's an empty new sock, the charging may fail
1551 * if sysctl_optmem_max was changed between creation of
1552 * original socket and cloning
1553 */
1554 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1555
278571ba 1556 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk))) {
87d11ceb
ACM		 1557 /* It is still raw copy of parent, so invalidate
1558 * destructor and make plain sk_free() */
1559 newsk->sk_destruct = NULL;
b0691c8e 1560 bh_unlock_sock(newsk);
87d11ceb
ACM		 1561 sk_free(newsk);
1562 newsk = NULL;
1563 goto out;
1564 }
1565
1566 newsk->sk_err = 0;
1567 newsk->sk_priority = 0;
2c8c56e1 1568 newsk->sk_incoming_cpu = raw_smp_processor_id();
33cf7c90 1569 atomic64_set(&newsk->sk_cookie, 0);
4dc6dc71
ED		 1570 /*
1571 * Before updating sk_refcnt, we must commit prior changes to memory
1572 * (Documentation/RCU/rculist_nulls.txt for details)
1573 */
1574 smp_wmb();
87d11ceb
ACM		 1575 atomic_set(&newsk->sk_refcnt, 2);
1576
1577 /*
1578 * Increment the counter in the same struct proto as the master
1579 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1580 * is the same as sk->sk_prot->socks, as this field was copied
1581 * with memcpy).
1582 *
1583 * This _changes_ the previous behaviour, where
1584 * tcp_create_openreq_child always was incrementing the
1585 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1586 * to be taken into account in all callers. -acme
1587 */
1588 sk_refcnt_debug_inc(newsk);
972692e0 1589 sk_set_socket(newsk, NULL);
43815482 1590 newsk->sk_wq = NULL;
87d11ceb 1591
f3f511e1
GC		 1592 sk_update_clone(sk, newsk);
1593
87d11ceb 1594 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1595 sk_sockets_allocated_inc(newsk);
704da560 1596
080a270f
HFS		 1597 if (sock_needs_netstamp(sk) &&
1598 newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1599 net_enable_timestamp();
87d11ceb
ACM		 1600 }
1601out:
1602 return newsk;
1603}
e56c57d0 1604EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1605
9958089a
AK		 1606void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1607{
d6a4e26a
ED		 1608 u32 max_segs = 1;
1609
9958089a
AK		 1610 __sk_dst_set(sk, dst);
1611 sk->sk_route_caps = dst->dev->features;
1612 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1613 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1614 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1615 if (sk_can_gso(sk)) {
82cc1a7a 1616 if (dst->header_len) {
9958089a 1617 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1618 } else {
9958089a 1619 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1620 sk->sk_gso_max_size = dst->dev->gso_max_size;
d6a4e26a 1621 max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
82cc1a7a 1622 }
9958089a 1623 }
d6a4e26a 1624 sk->sk_gso_max_segs = max_segs;
9958089a
AK		 1625}
1626EXPORT_SYMBOL_GPL(sk_setup_caps);
1627
1da177e4
LT		 1628/*
1629 * Simple resource managers for sockets.
1630 */
1631
1632
4ec93edb
YH		 1633/*
1634 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1635 */
1636void sock_wfree(struct sk_buff *skb)
1637{
1638 struct sock *sk = skb->sk;
d99927f4 1639 unsigned int len = skb->truesize;
1da177e4 1640
d99927f4
ED		 1641 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1642 /*
1643 * Keep a reference on sk_wmem_alloc, this will be released
1644 * after sk_write_space() call
1645 */
1646 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1647 sk->sk_write_space(sk);
d99927f4
ED		 1648 len = 1;
1649 }
2b85a34e 1650 /*
d99927f4
ED		 1651 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1652 * could not do because of in-flight packets
2b85a34e 1653 */
d99927f4 1654 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1655 __sk_free(sk);
1da177e4 1656}
2a91525c 1657EXPORT_SYMBOL(sock_wfree);
1da177e4 1658
9e17f8a4
ED		 1659void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1660{
1661 skb_orphan(skb);
1662 skb->sk = sk;
1663#ifdef CONFIG_INET
1664 if (unlikely(!sk_fullsock(sk))) {
1665 skb->destructor = sock_edemux;
1666 sock_hold(sk);
1667 return;
1668 }
1669#endif
1670 skb->destructor = sock_wfree;
1671 skb_set_hash_from_sk(skb, sk);
1672 /*
1673 * We used to take a refcount on sk, but following operation
1674 * is enough to guarantee sk_free() wont free this sock until
1675 * all in-flight packets are completed
1676 */
1677 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
1678}
1679EXPORT_SYMBOL(skb_set_owner_w);
1680
f2f872f9
ED		 1681void skb_orphan_partial(struct sk_buff *skb)
1682{
1683 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1684 * so we do not completely orphan skb, but transfert all
1685 * accounted bytes but one, to avoid unexpected reorders.
1686 */
1687 if (skb->destructor == sock_wfree
1688#ifdef CONFIG_INET
1689 || skb->destructor == tcp_wfree
1690#endif
1691 ) {
1692 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1693 skb->truesize = 1;
1694 } else {
1695 skb_orphan(skb);
1696 }
1697}
1698EXPORT_SYMBOL(skb_orphan_partial);
1699
4ec93edb
YH		 1700/*
1701 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1702 */
1703void sock_rfree(struct sk_buff *skb)
1704{
1705 struct sock *sk = skb->sk;
d361fd59 1706 unsigned int len = skb->truesize;
1da177e4 1707
d361fd59
ED		 1708 atomic_sub(len, &sk->sk_rmem_alloc);
1709 sk_mem_uncharge(sk, len);
1da177e4 1710}
2a91525c 1711EXPORT_SYMBOL(sock_rfree);
1da177e4 1712
7768eed8
OH		 1713/*
1714 * Buffer destructor for skbs that are not used directly in read or write
1715 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1716 */
62bccb8c
AD		 1717void sock_efree(struct sk_buff *skb)
1718{
1719 sock_put(skb->sk);
1720}
1721EXPORT_SYMBOL(sock_efree);
1722
976d0201 1723kuid_t sock_i_uid(struct sock *sk)
1da177e4 1724{
976d0201 1725 kuid_t uid;
1da177e4 1726
f064af1e 1727 read_lock_bh(&sk->sk_callback_lock);
976d0201 1728 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1729 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1730 return uid;
1731}
2a91525c 1732EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1733
1734unsigned long sock_i_ino(struct sock *sk)
1735{
1736 unsigned long ino;
1737
f064af1e 1738 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1739 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1740 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1741 return ino;
1742}
2a91525c 1743EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1744
1745/*
1746 * Allocate a skb from the socket's send buffer.
1747 */
86a76caf 1748struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1749 gfp_t priority)
1da177e4
LT		 1750{
1751 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1752 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1753 if (skb) {
1754 skb_set_owner_w(skb, sk);
1755 return skb;
1756 }
1757 }
1758 return NULL;
1759}
2a91525c 1760EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1761
4ec93edb 1762/*
1da177e4 1763 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1764 */
dd0fc66f 1765void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1766{
95c96174 1767 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1768 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1769 void *mem;
1770 /* First do the add, to avoid the race if kmalloc
4ec93edb 1771 * might sleep.
1da177e4
LT		 1772 */
1773 atomic_add(size, &sk->sk_omem_alloc);
1774 mem = kmalloc(size, priority);
1775 if (mem)
1776 return mem;
1777 atomic_sub(size, &sk->sk_omem_alloc);
1778 }
1779 return NULL;
1780}
2a91525c 1781EXPORT_SYMBOL(sock_kmalloc);
1da177e4 1782
79e88659
DB		 1783/* Free an option memory block. Note, we actually want the inline
1784 * here as this allows gcc to detect the nullify and fold away the
1785 * condition entirely.
1da177e4 1786 */
79e88659
DB		 1787static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
1788 const bool nullify)
1da177e4 1789{
e53da5fb
DM		 1790 if (WARN_ON_ONCE(!mem))
1791 return;
79e88659
DB		 1792 if (nullify)
1793 kzfree(mem);
1794 else
1795 kfree(mem);
1da177e4
LT		 1796 atomic_sub(size, &sk->sk_omem_alloc);
1797}
79e88659
DB		 1798
1799void sock_kfree_s(struct sock *sk, void *mem, int size)
1800{
1801 __sock_kfree_s(sk, mem, size, false);
1802}
2a91525c 1803EXPORT_SYMBOL(sock_kfree_s);
1da177e4 1804
79e88659
DB		 1805void sock_kzfree_s(struct sock *sk, void *mem, int size)
1806{
1807 __sock_kfree_s(sk, mem, size, true);
1808}
1809EXPORT_SYMBOL(sock_kzfree_s);
1810
1da177e4
LT		 1811/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1812 I think, these locks should be removed for datagram sockets.
1813 */
2a91525c 1814static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1815{
1816 DEFINE_WAIT(wait);
1817
1818 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1819 for (;;) {
1820 if (!timeo)
1821 break;
1822 if (signal_pending(current))
1823 break;
1824 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1825 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1826 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1827 break;
1828 if (sk->sk_shutdown & SEND_SHUTDOWN)
1829 break;
1830 if (sk->sk_err)
1831 break;
1832 timeo = schedule_timeout(timeo);
1833 }
aa395145 1834 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1835 return timeo;
1836}
1837
1838
1839/*
1840 * Generic send/receive buffer handlers
1841 */
1842
4cc7f68d
HX		 1843struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1844 unsigned long data_len, int noblock,
28d64271 1845 int *errcode, int max_page_order)
1da177e4 1846{
2e4e4410 1847 struct sk_buff *skb;
1da177e4
LT		 1848 long timeo;
1849 int err;
1850
1da177e4 1851 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1852 for (;;) {
1da177e4
LT		 1853 err = sock_error(sk);
1854 if (err != 0)
1855 goto failure;
1856
1857 err = -EPIPE;
1858 if (sk->sk_shutdown & SEND_SHUTDOWN)
1859 goto failure;
1860
2e4e4410
ED		 1861 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1862 break;
28d64271 1863
2e4e4410
ED		 1864 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1865 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1866 err = -EAGAIN;
1867 if (!timeo)
1da177e4 1868 goto failure;
2e4e4410
ED		 1869 if (signal_pending(current))
1870 goto interrupted;
1871 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1872 }
2e4e4410
ED		 1873 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1874 errcode, sk->sk_allocation);
1875 if (skb)
1876 skb_set_owner_w(skb, sk);
1da177e4
LT		 1877 return skb;
1878
1879interrupted:
1880 err = sock_intr_errno(timeo);
1881failure:
1882 *errcode = err;
1883 return NULL;
1884}
4cc7f68d 1885EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1886
4ec93edb 1887struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1888 int noblock, int *errcode)
1889{
28d64271 1890 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1891}
2a91525c 1892EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1893
f28ea365
EJ		 1894int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
1895 struct sockcm_cookie *sockc)
1896{
1897 struct cmsghdr *cmsg;
1898
1899 for_each_cmsghdr(cmsg, msg) {
1900 if (!CMSG_OK(msg, cmsg))
1901 return -EINVAL;
1902 if (cmsg->cmsg_level != SOL_SOCKET)
1903 continue;
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;
1912 default:
1913 return -EINVAL;
1914 }
1915 }
1916 return 0;
1917}
1918EXPORT_SYMBOL(sock_cmsg_send);
1919
5640f768
ED		 1920/* On 32bit arches, an skb frag is limited to 2^15 */
1921#define SKB_FRAG_PAGE_ORDER get_order(32768)
1922
400dfd3a
ED		 1923/**
1924 * skb_page_frag_refill - check that a page_frag contains enough room
1925 * @sz: minimum size of the fragment we want to get
1926 * @pfrag: pointer to page_frag
82d5e2b8 1927 * @gfp: priority for memory allocation
400dfd3a
ED		 1928 *
1929 * Note: While this allocator tries to use high order pages, there is
1930 * no guarantee that allocations succeed. Therefore, @sz MUST be
1931 * less or equal than PAGE_SIZE.
1932 */
d9b2938a 1933bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1934{
5640f768
ED		 1935 if (pfrag->page) {
1936 if (atomic_read(&pfrag->page->_count) == 1) {
1937 pfrag->offset = 0;
1938 return true;
1939 }
400dfd3a 1940 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1941 return true;
1942 put_page(pfrag->page);
1943 }
1944
d9b2938a
ED		 1945 pfrag->offset = 0;
1946 if (SKB_FRAG_PAGE_ORDER) {
d0164adc
MG		 1947 /* Avoid direct reclaim but allow kswapd to wake */
1948 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
1949 __GFP_COMP | __GFP_NOWARN |
1950 __GFP_NORETRY,
d9b2938a 1951 SKB_FRAG_PAGE_ORDER);
5640f768 1952 if (likely(pfrag->page)) {
d9b2938a 1953 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 1954 return true;
1955 }
d9b2938a
ED		 1956 }
1957 pfrag->page = alloc_page(gfp);
1958 if (likely(pfrag->page)) {
1959 pfrag->size = PAGE_SIZE;
1960 return true;
1961 }
400dfd3a
ED		 1962 return false;
1963}
1964EXPORT_SYMBOL(skb_page_frag_refill);
1965
1966bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1967{
1968 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1969 return true;
1970
5640f768
ED		 1971 sk_enter_memory_pressure(sk);
1972 sk_stream_moderate_sndbuf(sk);
1973 return false;
1974}
1975EXPORT_SYMBOL(sk_page_frag_refill);
1976
1da177e4 1977static void __lock_sock(struct sock *sk)
f39234d6
NK		 1978 __releases(&sk->sk_lock.slock)
1979 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1980{
1981 DEFINE_WAIT(wait);
1982
e71a4783 1983 for (;;) {
1da177e4
LT		 1984 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1985 TASK_UNINTERRUPTIBLE);
1986 spin_unlock_bh(&sk->sk_lock.slock);
1987 schedule();
1988 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1989 if (!sock_owned_by_user(sk))
1da177e4
LT		 1990 break;
1991 }
1992 finish_wait(&sk->sk_lock.wq, &wait);
1993}
1994
1995static void __release_sock(struct sock *sk)
f39234d6
NK		 1996 __releases(&sk->sk_lock.slock)
1997 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1998{
1999 struct sk_buff *skb = sk->sk_backlog.head;
2000
2001 do {
2002 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2003 bh_unlock_sock(sk);
2004
2005 do {
2006 struct sk_buff *next = skb->next;
2007
e4cbb02a 2008 prefetch(next);
7fee226a 2009 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 2010 skb->next = NULL;
c57943a1 2011 sk_backlog_rcv(sk, skb);
1da177e4
LT		 2012
2013 /*
2014 * We are in process context here with softirqs
2015 * disabled, use cond_resched_softirq() to preempt.
2016 * This is safe to do because we've taken the backlog
2017 * queue private:
2018 */
2019 cond_resched_softirq();
2020
2021 skb = next;
2022 } while (skb != NULL);
2023
2024 bh_lock_sock(sk);
e71a4783 2025 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 2026
2027 /*
2028 * Doing the zeroing here guarantee we can not loop forever
2029 * while a wild producer attempts to flood us.
2030 */
2031 sk->sk_backlog.len = 0;
1da177e4
LT		 2032}
2033
2034/**
2035 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 2036 * @sk: sock to wait on
2037 * @timeo: for how long
dfbafc99 2038 * @skb: last skb seen on sk_receive_queue
1da177e4
LT		 2039 *
2040 * Now socket state including sk->sk_err is changed only under lock,
2041 * hence we may omit checks after joining wait queue.
2042 * We check receive queue before schedule() only as optimization;
2043 * it is very likely that release_sock() added new data.
2044 */
dfbafc99 2045int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
1da177e4
LT		 2046{
2047 int rc;
2048 DEFINE_WAIT(wait);
2049
aa395145 2050 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4 2051 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
dfbafc99 2052 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb);
1da177e4 2053 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 2054 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2055 return rc;
2056}
1da177e4
LT		 2057EXPORT_SYMBOL(sk_wait_data);
2058
3ab224be
HA		 2059/**
2060 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2061 * @sk: socket
2062 * @size: memory size to allocate
2063 * @kind: allocation type
2064 *
2065 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2066 * rmem allocation. This function assumes that protocols which have
2067 * memory_pressure use sk_wmem_queued as write buffer accounting.
2068 */
2069int __sk_mem_schedule(struct sock *sk, int size, int kind)
2070{
2071 struct proto *prot = sk->sk_prot;
2072 int amt = sk_mem_pages(size);
8d987e5c 2073 long allocated;
e1aab161 2074 int parent_status = UNDER_LIMIT;
3ab224be
HA		 2075
2076 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2077
e1aab161 2078 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 2079
2080 /* Under limit. */
e1aab161
GC		 2081 if (parent_status == UNDER_LIMIT &&
2082 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2083 sk_leave_memory_pressure(sk);
3ab224be
HA		 2084 return 1;
2085 }
2086
e1aab161
GC		 2087 /* Under pressure. (we or our parents) */
2088 if ((parent_status > SOFT_LIMIT) ||
2089 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2090 sk_enter_memory_pressure(sk);
3ab224be 2091
e1aab161
GC		 2092 /* Over hard limit (we or our parents) */
2093 if ((parent_status == OVER_LIMIT) ||
2094 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 2095 goto suppress_allocation;
2096
2097 /* guarantee minimum buffer size under pressure */
2098 if (kind == SK_MEM_RECV) {
2099 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2100 return 1;
180d8cd9 2101
3ab224be
HA		 2102 } else { /* SK_MEM_SEND */
2103 if (sk->sk_type == SOCK_STREAM) {
2104 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2105 return 1;
2106 } else if (atomic_read(&sk->sk_wmem_alloc) <
2107 prot->sysctl_wmem[0])
2108 return 1;
2109 }
2110
180d8cd9 2111 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2112 int alloc;
2113
180d8cd9 2114 if (!sk_under_memory_pressure(sk))
1748376b 2115 return 1;
180d8cd9
GC		 2116 alloc = sk_sockets_allocated_read_positive(sk);
2117 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2118 sk_mem_pages(sk->sk_wmem_queued +
2119 atomic_read(&sk->sk_rmem_alloc) +
2120 sk->sk_forward_alloc))
2121 return 1;
2122 }
2123
2124suppress_allocation:
2125
2126 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2127 sk_stream_moderate_sndbuf(sk);
2128
2129 /* Fail only if socket is _under_ its sndbuf.
2130 * In this case we cannot block, so that we have to fail.
2131 */
2132 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2133 return 1;
2134 }
2135
3847ce32
SM		 2136 trace_sock_exceed_buf_limit(sk, prot, allocated);
2137
3ab224be
HA		 2138 /* Alas. Undo changes. */
2139 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2140
0e90b31f 2141 sk_memory_allocated_sub(sk, amt);
180d8cd9 2142
3ab224be
HA		 2143 return 0;
2144}
3ab224be
HA		 2145EXPORT_SYMBOL(__sk_mem_schedule);
2146
2147/**
69dba9bb 2148 * __sk_mem_reclaim - reclaim memory_allocated
3ab224be 2149 * @sk: socket
1a24e04e 2150 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
3ab224be 2151 */
1a24e04e 2152void __sk_mem_reclaim(struct sock *sk, int amount)
3ab224be 2153{
1a24e04e
ED		 2154 amount >>= SK_MEM_QUANTUM_SHIFT;
2155 sk_memory_allocated_sub(sk, amount);
2156 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
3ab224be 2157
180d8cd9
GC		 2158 if (sk_under_memory_pressure(sk) &&
2159 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2160 sk_leave_memory_pressure(sk);
3ab224be 2161}
3ab224be
HA		 2162EXPORT_SYMBOL(__sk_mem_reclaim);
2163
2164
1da177e4
LT		 2165/*
2166 * Set of default routines for initialising struct proto_ops when
2167 * the protocol does not support a particular function. In certain
2168 * cases where it makes no sense for a protocol to have a "do nothing"
2169 * function, some default processing is provided.
2170 */
2171
2172int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2173{
2174 return -EOPNOTSUPP;
2175}
2a91525c 2176EXPORT_SYMBOL(sock_no_bind);
1da177e4 2177
4ec93edb 2178int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2179 int len, int flags)
2180{
2181 return -EOPNOTSUPP;
2182}
2a91525c 2183EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2184
2185int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2186{
2187 return -EOPNOTSUPP;
2188}
2a91525c 2189EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2190
2191int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2192{
2193 return -EOPNOTSUPP;
2194}
2a91525c 2195EXPORT_SYMBOL(sock_no_accept);
1da177e4 2196
4ec93edb 2197int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2198 int *len, int peer)
2199{
2200 return -EOPNOTSUPP;
2201}
2a91525c 2202EXPORT_SYMBOL(sock_no_getname);
1da177e4 2203
2a91525c 2204unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2205{
2206 return 0;
2207}
2a91525c 2208EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2209
2210int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2211{
2212 return -EOPNOTSUPP;
2213}
2a91525c 2214EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2215
2216int sock_no_listen(struct socket *sock, int backlog)
2217{
2218 return -EOPNOTSUPP;
2219}
2a91525c 2220EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2221
2222int sock_no_shutdown(struct socket *sock, int how)
2223{
2224 return -EOPNOTSUPP;
2225}
2a91525c 2226EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2227
2228int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2229 char __user *optval, unsigned int optlen)
1da177e4
LT		 2230{
2231 return -EOPNOTSUPP;
2232}
2a91525c 2233EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2234
2235int sock_no_getsockopt(struct socket *sock, int level, int optname,
2236 char __user *optval, int __user *optlen)
2237{
2238 return -EOPNOTSUPP;
2239}
2a91525c 2240EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2241
1b784140 2242int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2243{
2244 return -EOPNOTSUPP;
2245}
2a91525c 2246EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2247
1b784140
YX		 2248int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2249 int flags)
1da177e4
LT		 2250{
2251 return -EOPNOTSUPP;
2252}
2a91525c 2253EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2254
2255int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2256{
2257 /* Mirror missing mmap method error code */
2258 return -ENODEV;
2259}
2a91525c 2260EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2261
2262ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2263{
2264 ssize_t res;
2265 struct msghdr msg = {.msg_flags = flags};
2266 struct kvec iov;
2267 char *kaddr = kmap(page);
2268 iov.iov_base = kaddr + offset;
2269 iov.iov_len = size;
2270 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2271 kunmap(page);
2272 return res;
2273}
2a91525c 2274EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2275
2276/*
2277 * Default Socket Callbacks
2278 */
2279
2280static void sock_def_wakeup(struct sock *sk)
2281{
43815482
ED		 2282 struct socket_wq *wq;
2283
2284 rcu_read_lock();
2285 wq = rcu_dereference(sk->sk_wq);
2286 if (wq_has_sleeper(wq))
2287 wake_up_interruptible_all(&wq->wait);
2288 rcu_read_unlock();
1da177e4
LT		 2289}
2290
2291static void sock_def_error_report(struct sock *sk)
2292{
43815482
ED		 2293 struct socket_wq *wq;
2294
2295 rcu_read_lock();
2296 wq = rcu_dereference(sk->sk_wq);
2297 if (wq_has_sleeper(wq))
2298 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2299 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2300 rcu_read_unlock();
1da177e4
LT		 2301}
2302
676d2369 2303static void sock_def_readable(struct sock *sk)
1da177e4 2304{
43815482
ED		 2305 struct socket_wq *wq;
2306
2307 rcu_read_lock();
2308 wq = rcu_dereference(sk->sk_wq);
2309 if (wq_has_sleeper(wq))
2c6607c6 2310 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2311 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2312 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2313 rcu_read_unlock();
1da177e4
LT		 2314}
2315
2316static void sock_def_write_space(struct sock *sk)
2317{
43815482
ED		 2318 struct socket_wq *wq;
2319
2320 rcu_read_lock();
1da177e4
LT		 2321
2322 /* Do not wake up a writer until he can make "significant"
2323 * progress. --DaveM
2324 */
e71a4783 2325 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2326 wq = rcu_dereference(sk->sk_wq);
2327 if (wq_has_sleeper(wq))
2328 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2329 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2330
2331 /* Should agree with poll, otherwise some programs break */
2332 if (sock_writeable(sk))
8d8ad9d7 2333 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2334 }
2335
43815482 2336 rcu_read_unlock();
1da177e4
LT		 2337}
2338
2339static void sock_def_destruct(struct sock *sk)
2340{
1da177e4
LT		 2341}
2342
2343void sk_send_sigurg(struct sock *sk)
2344{
2345 if (sk->sk_socket && sk->sk_socket->file)
2346 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2347 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2348}
2a91525c 2349EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2350
2351void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2352 unsigned long expires)
2353{
2354 if (!mod_timer(timer, expires))
2355 sock_hold(sk);
2356}
1da177e4
LT		 2357EXPORT_SYMBOL(sk_reset_timer);
2358
2359void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2360{
25cc4ae9 2361 if (del_timer(timer))
1da177e4
LT		 2362 __sock_put(sk);
2363}
1da177e4
LT		 2364EXPORT_SYMBOL(sk_stop_timer);
2365
2366void sock_init_data(struct socket *sock, struct sock *sk)
2367{
2368 skb_queue_head_init(&sk->sk_receive_queue);
2369 skb_queue_head_init(&sk->sk_write_queue);
2370 skb_queue_head_init(&sk->sk_error_queue);
2371
2372 sk->sk_send_head = NULL;
2373
2374 init_timer(&sk->sk_timer);
4ec93edb 2375
1da177e4
LT		 2376 sk->sk_allocation = GFP_KERNEL;
2377 sk->sk_rcvbuf = sysctl_rmem_default;
2378 sk->sk_sndbuf = sysctl_wmem_default;
2379 sk->sk_state = TCP_CLOSE;
972692e0 2380 sk_set_socket(sk, sock);
1da177e4
LT		 2381
2382 sock_set_flag(sk, SOCK_ZAPPED);
2383
e71a4783 2384 if (sock) {
1da177e4 2385 sk->sk_type = sock->type;
43815482 2386 sk->sk_wq = sock->wq;
1da177e4
LT		 2387 sock->sk = sk;
2388 } else
43815482 2389 sk->sk_wq = NULL;
1da177e4 2390
b6c6712a 2391 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2392 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2393 lockdep_set_class_and_name(&sk->sk_callback_lock,
2394 af_callback_keys + sk->sk_family,
2395 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2396
2397 sk->sk_state_change = sock_def_wakeup;
2398 sk->sk_data_ready = sock_def_readable;
2399 sk->sk_write_space = sock_def_write_space;
2400 sk->sk_error_report = sock_def_error_report;
2401 sk->sk_destruct = sock_def_destruct;
2402
5640f768
ED		 2403 sk->sk_frag.page = NULL;
2404 sk->sk_frag.offset = 0;
ef64a54f 2405 sk->sk_peek_off = -1;
1da177e4 2406
109f6e39
EB		 2407 sk->sk_peer_pid = NULL;
2408 sk->sk_peer_cred = NULL;
1da177e4
LT		 2409 sk->sk_write_pending = 0;
2410 sk->sk_rcvlowat = 1;
2411 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2412 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2413
f37f0afb 2414 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2415
e0d1095a 2416#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2417 sk->sk_napi_id = 0;
64b0dc51 2418 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2419#endif
2420
62748f32 2421 sk->sk_max_pacing_rate = ~0U;
7eec4174 2422 sk->sk_pacing_rate = ~0U;
70da268b 2423 sk->sk_incoming_cpu = -1;
4dc6dc71
ED		 2424 /*
2425 * Before updating sk_refcnt, we must commit prior changes to memory
2426 * (Documentation/RCU/rculist_nulls.txt for details)
2427 */
2428 smp_wmb();
1da177e4 2429 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2430 atomic_set(&sk->sk_drops, 0);
1da177e4 2431}
2a91525c 2432EXPORT_SYMBOL(sock_init_data);
1da177e4 2433
b5606c2d 2434void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2435{
2436 might_sleep();
a5b5bb9a 2437 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2438 if (sk->sk_lock.owned)
1da177e4 2439 __lock_sock(sk);
d2e9117c 2440 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2441 spin_unlock(&sk->sk_lock.slock);
2442 /*
2443 * The sk_lock has mutex_lock() semantics here:
2444 */
fcc70d5f 2445 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2446 local_bh_enable();
1da177e4 2447}
fcc70d5f 2448EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2449
b5606c2d 2450void release_sock(struct sock *sk)
1da177e4 2451{
a5b5bb9a
IM		 2452 /*
2453 * The sk_lock has mutex_unlock() semantics:
2454 */
2455 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2456
2457 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2458 if (sk->sk_backlog.tail)
2459 __release_sock(sk);
46d3ceab 2460
c3f9b018
ED		 2461 /* Warning : release_cb() might need to release sk ownership,
2462 * ie call sock_release_ownership(sk) before us.
2463 */
46d3ceab
ED		 2464 if (sk->sk_prot->release_cb)
2465 sk->sk_prot->release_cb(sk);
2466
c3f9b018 2467 sock_release_ownership(sk);
a5b5bb9a
IM		 2468 if (waitqueue_active(&sk->sk_lock.wq))
2469 wake_up(&sk->sk_lock.wq);
2470 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2471}
2472EXPORT_SYMBOL(release_sock);
2473
8a74ad60
ED		 2474/**
2475 * lock_sock_fast - fast version of lock_sock
2476 * @sk: socket
2477 *
2478 * This version should be used for very small section, where process wont block
2479 * return false if fast path is taken
2480 * sk_lock.slock locked, owned = 0, BH disabled
2481 * return true if slow path is taken
2482 * sk_lock.slock unlocked, owned = 1, BH enabled
2483 */
2484bool lock_sock_fast(struct sock *sk)
2485{
2486 might_sleep();
2487 spin_lock_bh(&sk->sk_lock.slock);
2488
2489 if (!sk->sk_lock.owned)
2490 /*
2491 * Note : We must disable BH
2492 */
2493 return false;
2494
2495 __lock_sock(sk);
2496 sk->sk_lock.owned = 1;
2497 spin_unlock(&sk->sk_lock.slock);
2498 /*
2499 * The sk_lock has mutex_lock() semantics here:
2500 */
2501 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2502 local_bh_enable();
2503 return true;
2504}
2505EXPORT_SYMBOL(lock_sock_fast);
2506
1da177e4 2507int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2508{
b7aa0bf7 2509 struct timeval tv;
1da177e4 2510 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2511 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2512 tv = ktime_to_timeval(sk->sk_stamp);
2513 if (tv.tv_sec == -1)
1da177e4 2514 return -ENOENT;
b7aa0bf7
ED		 2515 if (tv.tv_sec == 0) {
2516 sk->sk_stamp = ktime_get_real();
2517 tv = ktime_to_timeval(sk->sk_stamp);
2518 }
2519 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2520}
1da177e4
LT		 2521EXPORT_SYMBOL(sock_get_timestamp);
2522
ae40eb1e
ED		 2523int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2524{
2525 struct timespec ts;
2526 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2527 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2528 ts = ktime_to_timespec(sk->sk_stamp);
2529 if (ts.tv_sec == -1)
2530 return -ENOENT;
2531 if (ts.tv_sec == 0) {
2532 sk->sk_stamp = ktime_get_real();
2533 ts = ktime_to_timespec(sk->sk_stamp);
2534 }
2535 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2536}
2537EXPORT_SYMBOL(sock_get_timestampns);
2538
20d49473 2539void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2540{
20d49473 2541 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2542 unsigned long previous_flags = sk->sk_flags;
2543
20d49473
PO		 2544 sock_set_flag(sk, flag);
2545 /*
2546 * we just set one of the two flags which require net
2547 * time stamping, but time stamping might have been on
2548 * already because of the other one
2549 */
080a270f
HFS		 2550 if (sock_needs_netstamp(sk) &&
2551 !(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2552 net_enable_timestamp();
1da177e4
LT		 2553 }
2554}
1da177e4 2555
cb820f8e
RC		 2556int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2557 int level, int type)
2558{
2559 struct sock_exterr_skb *serr;
364a9e93 2560 struct sk_buff *skb;
cb820f8e
RC		 2561 int copied, err;
2562
2563 err = -EAGAIN;
364a9e93 2564 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2565 if (skb == NULL)
2566 goto out;
2567
2568 copied = skb->len;
2569 if (copied > len) {
2570 msg->msg_flags |= MSG_TRUNC;
2571 copied = len;
2572 }
51f3d02b 2573 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2574 if (err)
2575 goto out_free_skb;
2576
2577 sock_recv_timestamp(msg, sk, skb);
2578
2579 serr = SKB_EXT_ERR(skb);
2580 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2581
2582 msg->msg_flags |= MSG_ERRQUEUE;
2583 err = copied;
2584
cb820f8e
RC		 2585out_free_skb:
2586 kfree_skb(skb);
2587out:
2588 return err;
2589}
2590EXPORT_SYMBOL(sock_recv_errqueue);
2591
1da177e4
LT		 2592/*
2593 * Get a socket option on an socket.
2594 *
2595 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2596 * asynchronous errors should be reported by getsockopt. We assume
2597 * this means if you specify SO_ERROR (otherwise whats the point of it).
2598 */
2599int sock_common_getsockopt(struct socket *sock, int level, int optname,
2600 char __user *optval, int __user *optlen)
2601{
2602 struct sock *sk = sock->sk;
2603
2604 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2605}
1da177e4
LT		 2606EXPORT_SYMBOL(sock_common_getsockopt);
2607
3fdadf7d 2608#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2609int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2610 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2611{
2612 struct sock *sk = sock->sk;
2613
1e51f951 2614 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2615 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2616 optval, optlen);
3fdadf7d
DM		 2617 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2618}
2619EXPORT_SYMBOL(compat_sock_common_getsockopt);
2620#endif
2621
1b784140
YX		 2622int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2623 int flags)
1da177e4
LT		 2624{
2625 struct sock *sk = sock->sk;
2626 int addr_len = 0;
2627 int err;
2628
1b784140 2629 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2630 flags & ~MSG_DONTWAIT, &addr_len);
2631 if (err >= 0)
2632 msg->msg_namelen = addr_len;
2633 return err;
2634}
1da177e4
LT		 2635EXPORT_SYMBOL(sock_common_recvmsg);
2636
2637/*
2638 * Set socket options on an inet socket.
2639 */
2640int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2641 char __user *optval, unsigned int optlen)
1da177e4
LT		 2642{
2643 struct sock *sk = sock->sk;
2644
2645 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2646}
1da177e4
LT		 2647EXPORT_SYMBOL(sock_common_setsockopt);
2648
3fdadf7d 2649#ifdef CONFIG_COMPAT
543d9cfe 2650int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2651 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2652{
2653 struct sock *sk = sock->sk;
2654
543d9cfe
ACM		 2655 if (sk->sk_prot->compat_setsockopt != NULL)
2656 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2657 optval, optlen);
3fdadf7d
DM		 2658 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2659}
2660EXPORT_SYMBOL(compat_sock_common_setsockopt);
2661#endif
2662
1da177e4
LT		 2663void sk_common_release(struct sock *sk)
2664{
2665 if (sk->sk_prot->destroy)
2666 sk->sk_prot->destroy(sk);
2667
2668 /*
2669 * Observation: when sock_common_release is called, processes have
2670 * no access to socket. But net still has.
2671 * Step one, detach it from networking:
2672 *
2673 * A. Remove from hash tables.
2674 */
2675
2676 sk->sk_prot->unhash(sk);
2677
2678 /*
2679 * In this point socket cannot receive new packets, but it is possible
2680 * that some packets are in flight because some CPU runs receiver and
2681 * did hash table lookup before we unhashed socket. They will achieve
2682 * receive queue and will be purged by socket destructor.
2683 *
2684 * Also we still have packets pending on receive queue and probably,
2685 * our own packets waiting in device queues. sock_destroy will drain
2686 * receive queue, but transmitted packets will delay socket destruction
2687 * until the last reference will be released.
2688 */
2689
2690 sock_orphan(sk);
2691
2692 xfrm_sk_free_policy(sk);
2693
e6848976 2694 sk_refcnt_debug_release(sk);
5640f768
ED		 2695
2696 if (sk->sk_frag.page) {
2697 put_page(sk->sk_frag.page);
2698 sk->sk_frag.page = NULL;
2699 }
2700
1da177e4
LT		 2701 sock_put(sk);
2702}
1da177e4
LT		 2703EXPORT_SYMBOL(sk_common_release);
2704
13ff3d6f
PE		 2705#ifdef CONFIG_PROC_FS
2706#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2707struct prot_inuse {
2708 int val[PROTO_INUSE_NR];
2709};
13ff3d6f
PE		 2710
2711static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2712
2713#ifdef CONFIG_NET_NS
2714void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2715{
d6d9ca0f 2716 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2717}
2718EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2719
2720int sock_prot_inuse_get(struct net *net, struct proto *prot)
2721{
2722 int cpu, idx = prot->inuse_idx;
2723 int res = 0;
2724
2725 for_each_possible_cpu(cpu)
2726 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2727
2728 return res >= 0 ? res : 0;
2729}
2730EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2731
2c8c1e72 2732static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2733{
2734 net->core.inuse = alloc_percpu(struct prot_inuse);
2735 return net->core.inuse ? 0 : -ENOMEM;
2736}
2737
2c8c1e72 2738static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2739{
2740 free_percpu(net->core.inuse);
2741}
2742
2743static struct pernet_operations net_inuse_ops = {
2744 .init = sock_inuse_init_net,
2745 .exit = sock_inuse_exit_net,
2746};
2747
2748static __init int net_inuse_init(void)
2749{
2750 if (register_pernet_subsys(&net_inuse_ops))
2751 panic("Cannot initialize net inuse counters");
2752
2753 return 0;
2754}
2755
2756core_initcall(net_inuse_init);
2757#else
1338d466
PE		 2758static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2759
c29a0bc4 2760void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2761{
d6d9ca0f 2762 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2763}
2764EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2765
c29a0bc4 2766int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2767{
2768 int cpu, idx = prot->inuse_idx;
2769 int res = 0;
2770
2771 for_each_possible_cpu(cpu)
2772 res += per_cpu(prot_inuse, cpu).val[idx];
2773
2774 return res >= 0 ? res : 0;
2775}
2776EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2777#endif
13ff3d6f
PE		 2778
2779static void assign_proto_idx(struct proto *prot)
2780{
2781 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2782
2783 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2784 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2785 return;
2786 }
2787
2788 set_bit(prot->inuse_idx, proto_inuse_idx);
2789}
2790
2791static void release_proto_idx(struct proto *prot)
2792{
2793 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2794 clear_bit(prot->inuse_idx, proto_inuse_idx);
2795}
2796#else
2797static inline void assign_proto_idx(struct proto *prot)
2798{
2799}
2800
2801static inline void release_proto_idx(struct proto *prot)
2802{
2803}
2804#endif
2805
0159dfd3
ED		 2806static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2807{
2808 if (!rsk_prot)
2809 return;
2810 kfree(rsk_prot->slab_name);
2811 rsk_prot->slab_name = NULL;
adf78eda
JL		 2812 kmem_cache_destroy(rsk_prot->slab);
2813 rsk_prot->slab = NULL;
0159dfd3
ED		 2814}
2815
2816static int req_prot_init(const struct proto *prot)
2817{
2818 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2819
2820 if (!rsk_prot)
2821 return 0;
2822
2823 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2824 prot->name);
2825 if (!rsk_prot->slab_name)
2826 return -ENOMEM;
2827
2828 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2829 rsk_prot->obj_size, 0,
e96f78ab 2830 prot->slab_flags, NULL);
0159dfd3
ED		 2831
2832 if (!rsk_prot->slab) {
2833 pr_crit("%s: Can't create request sock SLAB cache!\n",
2834 prot->name);
2835 return -ENOMEM;
2836 }
2837 return 0;
2838}
2839
b733c007
PE		 2840int proto_register(struct proto *prot, int alloc_slab)
2841{
1da177e4
LT		 2842 if (alloc_slab) {
2843 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2844 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2845 NULL);
1da177e4
LT		 2846
2847 if (prot->slab == NULL) {
e005d193
JP		 2848 pr_crit("%s: Can't create sock SLAB cache!\n",
2849 prot->name);
60e7663d 2850 goto out;
1da177e4 2851 }
2e6599cb 2852
0159dfd3
ED		 2853 if (req_prot_init(prot))
2854 goto out_free_request_sock_slab;
8feaf0c0 2855
6d6ee43e 2856 if (prot->twsk_prot != NULL) {
faf23422 2857 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2858
7e56b5d6 2859 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2860 goto out_free_request_sock_slab;
2861
6d6ee43e 2862 prot->twsk_prot->twsk_slab =
7e56b5d6 2863 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2864 prot->twsk_prot->twsk_obj_size,
3ab5aee7 2865 0,
52db70dc 2866 prot->slab_flags,
20c2df83 2867 NULL);
6d6ee43e 2868 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2869 goto out_free_timewait_sock_slab_name;
2870 }
1da177e4
LT		 2871 }
2872
36b77a52 2873 mutex_lock(&proto_list_mutex);
1da177e4 2874 list_add(&prot->node, &proto_list);
13ff3d6f 2875 assign_proto_idx(prot);
36b77a52 2876 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2877 return 0;
2878
8feaf0c0 2879out_free_timewait_sock_slab_name:
7e56b5d6 2880 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 2881out_free_request_sock_slab:
0159dfd3
ED		 2882 req_prot_cleanup(prot->rsk_prot);
2883
2e6599cb
ACM		 2884 kmem_cache_destroy(prot->slab);
2885 prot->slab = NULL;
b733c007
PE		 2886out:
2887 return -ENOBUFS;
1da177e4 2888}
1da177e4
LT		 2889EXPORT_SYMBOL(proto_register);
2890
2891void proto_unregister(struct proto *prot)
2892{
36b77a52 2893 mutex_lock(&proto_list_mutex);
13ff3d6f 2894 release_proto_idx(prot);
0a3f4358 2895 list_del(&prot->node);
36b77a52 2896 mutex_unlock(&proto_list_mutex);
1da177e4 2897
adf78eda
JL		 2898 kmem_cache_destroy(prot->slab);
2899 prot->slab = NULL;
1da177e4 2900
0159dfd3 2901 req_prot_cleanup(prot->rsk_prot);
2e6599cb 2902
6d6ee43e 2903 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2904 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2905 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2906 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2907 }
1da177e4 2908}
1da177e4
LT		 2909EXPORT_SYMBOL(proto_unregister);
2910
2911#ifdef CONFIG_PROC_FS
1da177e4 2912static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2913 __acquires(proto_list_mutex)
1da177e4 2914{
36b77a52 2915 mutex_lock(&proto_list_mutex);
60f0438a 2916 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2917}
2918
2919static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2920{
60f0438a 2921 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2922}
2923
2924static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2925 __releases(proto_list_mutex)
1da177e4 2926{
36b77a52 2927 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2928}
2929
2930static char proto_method_implemented(const void *method)
2931{
2932 return method == NULL ? 'n' : 'y';
2933}
180d8cd9
GC		 2934static long sock_prot_memory_allocated(struct proto *proto)
2935{
cb75a36c 2936 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2937}
2938
2939static char *sock_prot_memory_pressure(struct proto *proto)
2940{
2941 return proto->memory_pressure != NULL ?
2942 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2943}
1da177e4
LT		 2944
2945static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2946{
180d8cd9 2947
8d987e5c 2948 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2949 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2950 proto->name,
2951 proto->obj_size,
14e943db 2952 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2953 sock_prot_memory_allocated(proto),
2954 sock_prot_memory_pressure(proto),
1da177e4
LT		 2955 proto->max_header,
2956 proto->slab == NULL ? "no" : "yes",
2957 module_name(proto->owner),
2958 proto_method_implemented(proto->close),
2959 proto_method_implemented(proto->connect),
2960 proto_method_implemented(proto->disconnect),
2961 proto_method_implemented(proto->accept),
2962 proto_method_implemented(proto->ioctl),
2963 proto_method_implemented(proto->init),
2964 proto_method_implemented(proto->destroy),
2965 proto_method_implemented(proto->shutdown),
2966 proto_method_implemented(proto->setsockopt),
2967 proto_method_implemented(proto->getsockopt),
2968 proto_method_implemented(proto->sendmsg),
2969 proto_method_implemented(proto->recvmsg),
2970 proto_method_implemented(proto->sendpage),
2971 proto_method_implemented(proto->bind),
2972 proto_method_implemented(proto->backlog_rcv),
2973 proto_method_implemented(proto->hash),
2974 proto_method_implemented(proto->unhash),
2975 proto_method_implemented(proto->get_port),
2976 proto_method_implemented(proto->enter_memory_pressure));
2977}
2978
2979static int proto_seq_show(struct seq_file *seq, void *v)
2980{
60f0438a 2981 if (v == &proto_list)
1da177e4
LT		 2982 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2983 "protocol",
2984 "size",
2985 "sockets",
2986 "memory",
2987 "press",
2988 "maxhdr",
2989 "slab",
2990 "module",
2991 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2992 else
60f0438a 2993 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2994 return 0;
2995}
2996
f690808e 2997static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2998 .start = proto_seq_start,
2999 .next = proto_seq_next,
3000 .stop = proto_seq_stop,
3001 .show = proto_seq_show,
3002};
3003
3004static int proto_seq_open(struct inode *inode, struct file *file)
3005{
14e943db
ED		 3006 return seq_open_net(inode, file, &proto_seq_ops,
3007 sizeof(struct seq_net_private));
1da177e4
LT		 3008}
3009
9a32144e 3010static const struct file_operations proto_seq_fops = {
1da177e4
LT		 3011 .owner = THIS_MODULE,
3012 .open = proto_seq_open,
3013 .read = seq_read,
3014 .llseek = seq_lseek,
14e943db
ED		 3015 .release = seq_release_net,
3016};
3017
3018static __net_init int proto_init_net(struct net *net)
3019{
d4beaa66 3020 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 3021 return -ENOMEM;
3022
3023 return 0;
3024}
3025
3026static __net_exit void proto_exit_net(struct net *net)
3027{
ece31ffd 3028 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 3029}
3030
3031
3032static __net_initdata struct pernet_operations proto_net_ops = {
3033 .init = proto_init_net,
3034 .exit = proto_exit_net,
1da177e4
LT		 3035};
3036
3037static int __init proto_init(void)
3038{
14e943db 3039 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 3040}
3041
3042subsys_initcall(proto_init);
3043
3044#endif /* PROC_FS */
Linux 6.x block layer and io_uring tree(s)