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mm, page_alloc: use masks and shifts when converting GFP flags to migrate types
[deliverable/linux.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Fixes:
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 36 * TCP layer surgery.
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
64 * (compatibility fix)
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
82 *
83 * To Fix:
84 *
85 *
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
90 */
91
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) {
fb05e7a8 1947 pfrag->page = alloc_pages((gfp & ~__GFP_WAIT) | __GFP_COMP |
d9b2938a
ED		 1948 __GFP_NOWARN | __GFP_NORETRY,
1949 SKB_FRAG_PAGE_ORDER);
5640f768 1950 if (likely(pfrag->page)) {
d9b2938a 1951 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 1952 return true;
1953 }
d9b2938a
ED		 1954 }
1955 pfrag->page = alloc_page(gfp);
1956 if (likely(pfrag->page)) {
1957 pfrag->size = PAGE_SIZE;
1958 return true;
1959 }
400dfd3a
ED		 1960 return false;
1961}
1962EXPORT_SYMBOL(skb_page_frag_refill);
1963
1964bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1965{
1966 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1967 return true;
1968
5640f768
ED		 1969 sk_enter_memory_pressure(sk);
1970 sk_stream_moderate_sndbuf(sk);
1971 return false;
1972}
1973EXPORT_SYMBOL(sk_page_frag_refill);
1974
1da177e4 1975static void __lock_sock(struct sock *sk)
f39234d6
NK		 1976 __releases(&sk->sk_lock.slock)
1977 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1978{
1979 DEFINE_WAIT(wait);
1980
e71a4783 1981 for (;;) {
1da177e4
LT		 1982 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1983 TASK_UNINTERRUPTIBLE);
1984 spin_unlock_bh(&sk->sk_lock.slock);
1985 schedule();
1986 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1987 if (!sock_owned_by_user(sk))
1da177e4
LT		 1988 break;
1989 }
1990 finish_wait(&sk->sk_lock.wq, &wait);
1991}
1992
1993static void __release_sock(struct sock *sk)
f39234d6
NK		 1994 __releases(&sk->sk_lock.slock)
1995 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1996{
1997 struct sk_buff *skb = sk->sk_backlog.head;
1998
1999 do {
2000 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
2001 bh_unlock_sock(sk);
2002
2003 do {
2004 struct sk_buff *next = skb->next;
2005
e4cbb02a 2006 prefetch(next);
7fee226a 2007 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 2008 skb->next = NULL;
c57943a1 2009 sk_backlog_rcv(sk, skb);
1da177e4
LT		 2010
2011 /*
2012 * We are in process context here with softirqs
2013 * disabled, use cond_resched_softirq() to preempt.
2014 * This is safe to do because we've taken the backlog
2015 * queue private:
2016 */
2017 cond_resched_softirq();
2018
2019 skb = next;
2020 } while (skb != NULL);
2021
2022 bh_lock_sock(sk);
e71a4783 2023 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 2024
2025 /*
2026 * Doing the zeroing here guarantee we can not loop forever
2027 * while a wild producer attempts to flood us.
2028 */
2029 sk->sk_backlog.len = 0;
1da177e4
LT		 2030}
2031
2032/**
2033 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 2034 * @sk: sock to wait on
2035 * @timeo: for how long
dfbafc99 2036 * @skb: last skb seen on sk_receive_queue
1da177e4
LT		 2037 *
2038 * Now socket state including sk->sk_err is changed only under lock,
2039 * hence we may omit checks after joining wait queue.
2040 * We check receive queue before schedule() only as optimization;
2041 * it is very likely that release_sock() added new data.
2042 */
dfbafc99 2043int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
1da177e4
LT		 2044{
2045 int rc;
2046 DEFINE_WAIT(wait);
2047
aa395145 2048 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4 2049 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
dfbafc99 2050 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb);
1da177e4 2051 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 2052 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2053 return rc;
2054}
1da177e4
LT		 2055EXPORT_SYMBOL(sk_wait_data);
2056
3ab224be
HA		 2057/**
2058 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2059 * @sk: socket
2060 * @size: memory size to allocate
2061 * @kind: allocation type
2062 *
2063 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2064 * rmem allocation. This function assumes that protocols which have
2065 * memory_pressure use sk_wmem_queued as write buffer accounting.
2066 */
2067int __sk_mem_schedule(struct sock *sk, int size, int kind)
2068{
2069 struct proto *prot = sk->sk_prot;
2070 int amt = sk_mem_pages(size);
8d987e5c 2071 long allocated;
e1aab161 2072 int parent_status = UNDER_LIMIT;
3ab224be
HA		 2073
2074 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2075
e1aab161 2076 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 2077
2078 /* Under limit. */
e1aab161
GC		 2079 if (parent_status == UNDER_LIMIT &&
2080 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2081 sk_leave_memory_pressure(sk);
3ab224be
HA		 2082 return 1;
2083 }
2084
e1aab161
GC		 2085 /* Under pressure. (we or our parents) */
2086 if ((parent_status > SOFT_LIMIT) ||
2087 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2088 sk_enter_memory_pressure(sk);
3ab224be 2089
e1aab161
GC		 2090 /* Over hard limit (we or our parents) */
2091 if ((parent_status == OVER_LIMIT) ||
2092 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 2093 goto suppress_allocation;
2094
2095 /* guarantee minimum buffer size under pressure */
2096 if (kind == SK_MEM_RECV) {
2097 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2098 return 1;
180d8cd9 2099
3ab224be
HA		 2100 } else { /* SK_MEM_SEND */
2101 if (sk->sk_type == SOCK_STREAM) {
2102 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2103 return 1;
2104 } else if (atomic_read(&sk->sk_wmem_alloc) <
2105 prot->sysctl_wmem[0])
2106 return 1;
2107 }
2108
180d8cd9 2109 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2110 int alloc;
2111
180d8cd9 2112 if (!sk_under_memory_pressure(sk))
1748376b 2113 return 1;
180d8cd9
GC		 2114 alloc = sk_sockets_allocated_read_positive(sk);
2115 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2116 sk_mem_pages(sk->sk_wmem_queued +
2117 atomic_read(&sk->sk_rmem_alloc) +
2118 sk->sk_forward_alloc))
2119 return 1;
2120 }
2121
2122suppress_allocation:
2123
2124 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2125 sk_stream_moderate_sndbuf(sk);
2126
2127 /* Fail only if socket is _under_ its sndbuf.
2128 * In this case we cannot block, so that we have to fail.
2129 */
2130 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2131 return 1;
2132 }
2133
3847ce32
SM		 2134 trace_sock_exceed_buf_limit(sk, prot, allocated);
2135
3ab224be
HA		 2136 /* Alas. Undo changes. */
2137 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2138
0e90b31f 2139 sk_memory_allocated_sub(sk, amt);
180d8cd9 2140
3ab224be
HA		 2141 return 0;
2142}
3ab224be
HA		 2143EXPORT_SYMBOL(__sk_mem_schedule);
2144
2145/**
69dba9bb 2146 * __sk_mem_reclaim - reclaim memory_allocated
3ab224be 2147 * @sk: socket
1a24e04e 2148 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
3ab224be 2149 */
1a24e04e 2150void __sk_mem_reclaim(struct sock *sk, int amount)
3ab224be 2151{
1a24e04e
ED		 2152 amount >>= SK_MEM_QUANTUM_SHIFT;
2153 sk_memory_allocated_sub(sk, amount);
2154 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT;
3ab224be 2155
180d8cd9
GC		 2156 if (sk_under_memory_pressure(sk) &&
2157 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2158 sk_leave_memory_pressure(sk);
3ab224be 2159}
3ab224be
HA		 2160EXPORT_SYMBOL(__sk_mem_reclaim);
2161
2162
1da177e4
LT		 2163/*
2164 * Set of default routines for initialising struct proto_ops when
2165 * the protocol does not support a particular function. In certain
2166 * cases where it makes no sense for a protocol to have a "do nothing"
2167 * function, some default processing is provided.
2168 */
2169
2170int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2171{
2172 return -EOPNOTSUPP;
2173}
2a91525c 2174EXPORT_SYMBOL(sock_no_bind);
1da177e4 2175
4ec93edb 2176int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2177 int len, int flags)
2178{
2179 return -EOPNOTSUPP;
2180}
2a91525c 2181EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2182
2183int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2184{
2185 return -EOPNOTSUPP;
2186}
2a91525c 2187EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2188
2189int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2190{
2191 return -EOPNOTSUPP;
2192}
2a91525c 2193EXPORT_SYMBOL(sock_no_accept);
1da177e4 2194
4ec93edb 2195int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2196 int *len, int peer)
2197{
2198 return -EOPNOTSUPP;
2199}
2a91525c 2200EXPORT_SYMBOL(sock_no_getname);
1da177e4 2201
2a91525c 2202unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2203{
2204 return 0;
2205}
2a91525c 2206EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2207
2208int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2209{
2210 return -EOPNOTSUPP;
2211}
2a91525c 2212EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2213
2214int sock_no_listen(struct socket *sock, int backlog)
2215{
2216 return -EOPNOTSUPP;
2217}
2a91525c 2218EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2219
2220int sock_no_shutdown(struct socket *sock, int how)
2221{
2222 return -EOPNOTSUPP;
2223}
2a91525c 2224EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2225
2226int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2227 char __user *optval, unsigned int optlen)
1da177e4
LT		 2228{
2229 return -EOPNOTSUPP;
2230}
2a91525c 2231EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2232
2233int sock_no_getsockopt(struct socket *sock, int level, int optname,
2234 char __user *optval, int __user *optlen)
2235{
2236 return -EOPNOTSUPP;
2237}
2a91525c 2238EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4 2239
1b784140 2240int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
1da177e4
LT		 2241{
2242 return -EOPNOTSUPP;
2243}
2a91525c 2244EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4 2245
1b784140
YX		 2246int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
2247 int flags)
1da177e4
LT		 2248{
2249 return -EOPNOTSUPP;
2250}
2a91525c 2251EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2252
2253int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2254{
2255 /* Mirror missing mmap method error code */
2256 return -ENODEV;
2257}
2a91525c 2258EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2259
2260ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2261{
2262 ssize_t res;
2263 struct msghdr msg = {.msg_flags = flags};
2264 struct kvec iov;
2265 char *kaddr = kmap(page);
2266 iov.iov_base = kaddr + offset;
2267 iov.iov_len = size;
2268 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2269 kunmap(page);
2270 return res;
2271}
2a91525c 2272EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2273
2274/*
2275 * Default Socket Callbacks
2276 */
2277
2278static void sock_def_wakeup(struct sock *sk)
2279{
43815482
ED		 2280 struct socket_wq *wq;
2281
2282 rcu_read_lock();
2283 wq = rcu_dereference(sk->sk_wq);
2284 if (wq_has_sleeper(wq))
2285 wake_up_interruptible_all(&wq->wait);
2286 rcu_read_unlock();
1da177e4
LT		 2287}
2288
2289static void sock_def_error_report(struct sock *sk)
2290{
43815482
ED		 2291 struct socket_wq *wq;
2292
2293 rcu_read_lock();
2294 wq = rcu_dereference(sk->sk_wq);
2295 if (wq_has_sleeper(wq))
2296 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2297 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2298 rcu_read_unlock();
1da177e4
LT		 2299}
2300
676d2369 2301static void sock_def_readable(struct sock *sk)
1da177e4 2302{
43815482
ED		 2303 struct socket_wq *wq;
2304
2305 rcu_read_lock();
2306 wq = rcu_dereference(sk->sk_wq);
2307 if (wq_has_sleeper(wq))
2c6607c6 2308 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2309 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2310 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2311 rcu_read_unlock();
1da177e4
LT		 2312}
2313
2314static void sock_def_write_space(struct sock *sk)
2315{
43815482
ED		 2316 struct socket_wq *wq;
2317
2318 rcu_read_lock();
1da177e4
LT		 2319
2320 /* Do not wake up a writer until he can make "significant"
2321 * progress. --DaveM
2322 */
e71a4783 2323 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2324 wq = rcu_dereference(sk->sk_wq);
2325 if (wq_has_sleeper(wq))
2326 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2327 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2328
2329 /* Should agree with poll, otherwise some programs break */
2330 if (sock_writeable(sk))
8d8ad9d7 2331 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2332 }
2333
43815482 2334 rcu_read_unlock();
1da177e4
LT		 2335}
2336
2337static void sock_def_destruct(struct sock *sk)
2338{
1da177e4
LT		 2339}
2340
2341void sk_send_sigurg(struct sock *sk)
2342{
2343 if (sk->sk_socket && sk->sk_socket->file)
2344 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2345 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2346}
2a91525c 2347EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2348
2349void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2350 unsigned long expires)
2351{
2352 if (!mod_timer(timer, expires))
2353 sock_hold(sk);
2354}
1da177e4
LT		 2355EXPORT_SYMBOL(sk_reset_timer);
2356
2357void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2358{
25cc4ae9 2359 if (del_timer(timer))
1da177e4
LT		 2360 __sock_put(sk);
2361}
1da177e4
LT		 2362EXPORT_SYMBOL(sk_stop_timer);
2363
2364void sock_init_data(struct socket *sock, struct sock *sk)
2365{
2366 skb_queue_head_init(&sk->sk_receive_queue);
2367 skb_queue_head_init(&sk->sk_write_queue);
2368 skb_queue_head_init(&sk->sk_error_queue);
2369
2370 sk->sk_send_head = NULL;
2371
2372 init_timer(&sk->sk_timer);
4ec93edb 2373
1da177e4
LT		 2374 sk->sk_allocation = GFP_KERNEL;
2375 sk->sk_rcvbuf = sysctl_rmem_default;
2376 sk->sk_sndbuf = sysctl_wmem_default;
2377 sk->sk_state = TCP_CLOSE;
972692e0 2378 sk_set_socket(sk, sock);
1da177e4
LT		 2379
2380 sock_set_flag(sk, SOCK_ZAPPED);
2381
e71a4783 2382 if (sock) {
1da177e4 2383 sk->sk_type = sock->type;
43815482 2384 sk->sk_wq = sock->wq;
1da177e4
LT		 2385 sock->sk = sk;
2386 } else
43815482 2387 sk->sk_wq = NULL;
1da177e4 2388
b6c6712a 2389 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2390 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2391 lockdep_set_class_and_name(&sk->sk_callback_lock,
2392 af_callback_keys + sk->sk_family,
2393 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2394
2395 sk->sk_state_change = sock_def_wakeup;
2396 sk->sk_data_ready = sock_def_readable;
2397 sk->sk_write_space = sock_def_write_space;
2398 sk->sk_error_report = sock_def_error_report;
2399 sk->sk_destruct = sock_def_destruct;
2400
5640f768
ED		 2401 sk->sk_frag.page = NULL;
2402 sk->sk_frag.offset = 0;
ef64a54f 2403 sk->sk_peek_off = -1;
1da177e4 2404
109f6e39
EB		 2405 sk->sk_peer_pid = NULL;
2406 sk->sk_peer_cred = NULL;
1da177e4
LT		 2407 sk->sk_write_pending = 0;
2408 sk->sk_rcvlowat = 1;
2409 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2410 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2411
f37f0afb 2412 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2413
e0d1095a 2414#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2415 sk->sk_napi_id = 0;
64b0dc51 2416 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2417#endif
2418
62748f32 2419 sk->sk_max_pacing_rate = ~0U;
7eec4174 2420 sk->sk_pacing_rate = ~0U;
70da268b 2421 sk->sk_incoming_cpu = -1;
4dc6dc71
ED		 2422 /*
2423 * Before updating sk_refcnt, we must commit prior changes to memory
2424 * (Documentation/RCU/rculist_nulls.txt for details)
2425 */
2426 smp_wmb();
1da177e4 2427 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2428 atomic_set(&sk->sk_drops, 0);
1da177e4 2429}
2a91525c 2430EXPORT_SYMBOL(sock_init_data);
1da177e4 2431
b5606c2d 2432void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2433{
2434 might_sleep();
a5b5bb9a 2435 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2436 if (sk->sk_lock.owned)
1da177e4 2437 __lock_sock(sk);
d2e9117c 2438 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2439 spin_unlock(&sk->sk_lock.slock);
2440 /*
2441 * The sk_lock has mutex_lock() semantics here:
2442 */
fcc70d5f 2443 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2444 local_bh_enable();
1da177e4 2445}
fcc70d5f 2446EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2447
b5606c2d 2448void release_sock(struct sock *sk)
1da177e4 2449{
a5b5bb9a
IM		 2450 /*
2451 * The sk_lock has mutex_unlock() semantics:
2452 */
2453 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2454
2455 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2456 if (sk->sk_backlog.tail)
2457 __release_sock(sk);
46d3ceab 2458
c3f9b018
ED		 2459 /* Warning : release_cb() might need to release sk ownership,
2460 * ie call sock_release_ownership(sk) before us.
2461 */
46d3ceab
ED		 2462 if (sk->sk_prot->release_cb)
2463 sk->sk_prot->release_cb(sk);
2464
c3f9b018 2465 sock_release_ownership(sk);
a5b5bb9a
IM		 2466 if (waitqueue_active(&sk->sk_lock.wq))
2467 wake_up(&sk->sk_lock.wq);
2468 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2469}
2470EXPORT_SYMBOL(release_sock);
2471
8a74ad60
ED		 2472/**
2473 * lock_sock_fast - fast version of lock_sock
2474 * @sk: socket
2475 *
2476 * This version should be used for very small section, where process wont block
2477 * return false if fast path is taken
2478 * sk_lock.slock locked, owned = 0, BH disabled
2479 * return true if slow path is taken
2480 * sk_lock.slock unlocked, owned = 1, BH enabled
2481 */
2482bool lock_sock_fast(struct sock *sk)
2483{
2484 might_sleep();
2485 spin_lock_bh(&sk->sk_lock.slock);
2486
2487 if (!sk->sk_lock.owned)
2488 /*
2489 * Note : We must disable BH
2490 */
2491 return false;
2492
2493 __lock_sock(sk);
2494 sk->sk_lock.owned = 1;
2495 spin_unlock(&sk->sk_lock.slock);
2496 /*
2497 * The sk_lock has mutex_lock() semantics here:
2498 */
2499 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2500 local_bh_enable();
2501 return true;
2502}
2503EXPORT_SYMBOL(lock_sock_fast);
2504
1da177e4 2505int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2506{
b7aa0bf7 2507 struct timeval tv;
1da177e4 2508 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2509 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2510 tv = ktime_to_timeval(sk->sk_stamp);
2511 if (tv.tv_sec == -1)
1da177e4 2512 return -ENOENT;
b7aa0bf7
ED		 2513 if (tv.tv_sec == 0) {
2514 sk->sk_stamp = ktime_get_real();
2515 tv = ktime_to_timeval(sk->sk_stamp);
2516 }
2517 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2518}
1da177e4
LT		 2519EXPORT_SYMBOL(sock_get_timestamp);
2520
ae40eb1e
ED		 2521int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2522{
2523 struct timespec ts;
2524 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2525 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2526 ts = ktime_to_timespec(sk->sk_stamp);
2527 if (ts.tv_sec == -1)
2528 return -ENOENT;
2529 if (ts.tv_sec == 0) {
2530 sk->sk_stamp = ktime_get_real();
2531 ts = ktime_to_timespec(sk->sk_stamp);
2532 }
2533 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2534}
2535EXPORT_SYMBOL(sock_get_timestampns);
2536
20d49473 2537void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2538{
20d49473 2539 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2540 unsigned long previous_flags = sk->sk_flags;
2541
20d49473
PO		 2542 sock_set_flag(sk, flag);
2543 /*
2544 * we just set one of the two flags which require net
2545 * time stamping, but time stamping might have been on
2546 * already because of the other one
2547 */
080a270f
HFS		 2548 if (sock_needs_netstamp(sk) &&
2549 !(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2550 net_enable_timestamp();
1da177e4
LT		 2551 }
2552}
1da177e4 2553
cb820f8e
RC		 2554int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2555 int level, int type)
2556{
2557 struct sock_exterr_skb *serr;
364a9e93 2558 struct sk_buff *skb;
cb820f8e
RC		 2559 int copied, err;
2560
2561 err = -EAGAIN;
364a9e93 2562 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2563 if (skb == NULL)
2564 goto out;
2565
2566 copied = skb->len;
2567 if (copied > len) {
2568 msg->msg_flags |= MSG_TRUNC;
2569 copied = len;
2570 }
51f3d02b 2571 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2572 if (err)
2573 goto out_free_skb;
2574
2575 sock_recv_timestamp(msg, sk, skb);
2576
2577 serr = SKB_EXT_ERR(skb);
2578 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2579
2580 msg->msg_flags |= MSG_ERRQUEUE;
2581 err = copied;
2582
cb820f8e
RC		 2583out_free_skb:
2584 kfree_skb(skb);
2585out:
2586 return err;
2587}
2588EXPORT_SYMBOL(sock_recv_errqueue);
2589
1da177e4
LT		 2590/*
2591 * Get a socket option on an socket.
2592 *
2593 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2594 * asynchronous errors should be reported by getsockopt. We assume
2595 * this means if you specify SO_ERROR (otherwise whats the point of it).
2596 */
2597int sock_common_getsockopt(struct socket *sock, int level, int optname,
2598 char __user *optval, int __user *optlen)
2599{
2600 struct sock *sk = sock->sk;
2601
2602 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2603}
1da177e4
LT		 2604EXPORT_SYMBOL(sock_common_getsockopt);
2605
3fdadf7d 2606#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2607int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2608 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2609{
2610 struct sock *sk = sock->sk;
2611
1e51f951 2612 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2613 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2614 optval, optlen);
3fdadf7d
DM		 2615 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2616}
2617EXPORT_SYMBOL(compat_sock_common_getsockopt);
2618#endif
2619
1b784140
YX		 2620int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
2621 int flags)
1da177e4
LT		 2622{
2623 struct sock *sk = sock->sk;
2624 int addr_len = 0;
2625 int err;
2626
1b784140 2627 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
1da177e4
LT		 2628 flags & ~MSG_DONTWAIT, &addr_len);
2629 if (err >= 0)
2630 msg->msg_namelen = addr_len;
2631 return err;
2632}
1da177e4
LT		 2633EXPORT_SYMBOL(sock_common_recvmsg);
2634
2635/*
2636 * Set socket options on an inet socket.
2637 */
2638int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2639 char __user *optval, unsigned int optlen)
1da177e4
LT		 2640{
2641 struct sock *sk = sock->sk;
2642
2643 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2644}
1da177e4
LT		 2645EXPORT_SYMBOL(sock_common_setsockopt);
2646
3fdadf7d 2647#ifdef CONFIG_COMPAT
543d9cfe 2648int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2649 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2650{
2651 struct sock *sk = sock->sk;
2652
543d9cfe
ACM		 2653 if (sk->sk_prot->compat_setsockopt != NULL)
2654 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2655 optval, optlen);
3fdadf7d
DM		 2656 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2657}
2658EXPORT_SYMBOL(compat_sock_common_setsockopt);
2659#endif
2660
1da177e4
LT		 2661void sk_common_release(struct sock *sk)
2662{
2663 if (sk->sk_prot->destroy)
2664 sk->sk_prot->destroy(sk);
2665
2666 /*
2667 * Observation: when sock_common_release is called, processes have
2668 * no access to socket. But net still has.
2669 * Step one, detach it from networking:
2670 *
2671 * A. Remove from hash tables.
2672 */
2673
2674 sk->sk_prot->unhash(sk);
2675
2676 /*
2677 * In this point socket cannot receive new packets, but it is possible
2678 * that some packets are in flight because some CPU runs receiver and
2679 * did hash table lookup before we unhashed socket. They will achieve
2680 * receive queue and will be purged by socket destructor.
2681 *
2682 * Also we still have packets pending on receive queue and probably,
2683 * our own packets waiting in device queues. sock_destroy will drain
2684 * receive queue, but transmitted packets will delay socket destruction
2685 * until the last reference will be released.
2686 */
2687
2688 sock_orphan(sk);
2689
2690 xfrm_sk_free_policy(sk);
2691
e6848976 2692 sk_refcnt_debug_release(sk);
5640f768
ED		 2693
2694 if (sk->sk_frag.page) {
2695 put_page(sk->sk_frag.page);
2696 sk->sk_frag.page = NULL;
2697 }
2698
1da177e4
LT		 2699 sock_put(sk);
2700}
1da177e4
LT		 2701EXPORT_SYMBOL(sk_common_release);
2702
13ff3d6f
PE		 2703#ifdef CONFIG_PROC_FS
2704#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2705struct prot_inuse {
2706 int val[PROTO_INUSE_NR];
2707};
13ff3d6f
PE		 2708
2709static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2710
2711#ifdef CONFIG_NET_NS
2712void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2713{
d6d9ca0f 2714 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2715}
2716EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2717
2718int sock_prot_inuse_get(struct net *net, struct proto *prot)
2719{
2720 int cpu, idx = prot->inuse_idx;
2721 int res = 0;
2722
2723 for_each_possible_cpu(cpu)
2724 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2725
2726 return res >= 0 ? res : 0;
2727}
2728EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2729
2c8c1e72 2730static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2731{
2732 net->core.inuse = alloc_percpu(struct prot_inuse);
2733 return net->core.inuse ? 0 : -ENOMEM;
2734}
2735
2c8c1e72 2736static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2737{
2738 free_percpu(net->core.inuse);
2739}
2740
2741static struct pernet_operations net_inuse_ops = {
2742 .init = sock_inuse_init_net,
2743 .exit = sock_inuse_exit_net,
2744};
2745
2746static __init int net_inuse_init(void)
2747{
2748 if (register_pernet_subsys(&net_inuse_ops))
2749 panic("Cannot initialize net inuse counters");
2750
2751 return 0;
2752}
2753
2754core_initcall(net_inuse_init);
2755#else
1338d466
PE		 2756static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2757
c29a0bc4 2758void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2759{
d6d9ca0f 2760 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2761}
2762EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2763
c29a0bc4 2764int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2765{
2766 int cpu, idx = prot->inuse_idx;
2767 int res = 0;
2768
2769 for_each_possible_cpu(cpu)
2770 res += per_cpu(prot_inuse, cpu).val[idx];
2771
2772 return res >= 0 ? res : 0;
2773}
2774EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2775#endif
13ff3d6f
PE		 2776
2777static void assign_proto_idx(struct proto *prot)
2778{
2779 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2780
2781 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2782 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2783 return;
2784 }
2785
2786 set_bit(prot->inuse_idx, proto_inuse_idx);
2787}
2788
2789static void release_proto_idx(struct proto *prot)
2790{
2791 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2792 clear_bit(prot->inuse_idx, proto_inuse_idx);
2793}
2794#else
2795static inline void assign_proto_idx(struct proto *prot)
2796{
2797}
2798
2799static inline void release_proto_idx(struct proto *prot)
2800{
2801}
2802#endif
2803
0159dfd3
ED		 2804static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
2805{
2806 if (!rsk_prot)
2807 return;
2808 kfree(rsk_prot->slab_name);
2809 rsk_prot->slab_name = NULL;
adf78eda
JL		 2810 kmem_cache_destroy(rsk_prot->slab);
2811 rsk_prot->slab = NULL;
0159dfd3
ED		 2812}
2813
2814static int req_prot_init(const struct proto *prot)
2815{
2816 struct request_sock_ops *rsk_prot = prot->rsk_prot;
2817
2818 if (!rsk_prot)
2819 return 0;
2820
2821 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
2822 prot->name);
2823 if (!rsk_prot->slab_name)
2824 return -ENOMEM;
2825
2826 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
2827 rsk_prot->obj_size, 0,
e96f78ab 2828 prot->slab_flags, NULL);
0159dfd3
ED		 2829
2830 if (!rsk_prot->slab) {
2831 pr_crit("%s: Can't create request sock SLAB cache!\n",
2832 prot->name);
2833 return -ENOMEM;
2834 }
2835 return 0;
2836}
2837
b733c007
PE		 2838int proto_register(struct proto *prot, int alloc_slab)
2839{
1da177e4
LT		 2840 if (alloc_slab) {
2841 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2842 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2843 NULL);
1da177e4
LT		 2844
2845 if (prot->slab == NULL) {
e005d193
JP		 2846 pr_crit("%s: Can't create sock SLAB cache!\n",
2847 prot->name);
60e7663d 2848 goto out;
1da177e4 2849 }
2e6599cb 2850
0159dfd3
ED		 2851 if (req_prot_init(prot))
2852 goto out_free_request_sock_slab;
8feaf0c0 2853
6d6ee43e 2854 if (prot->twsk_prot != NULL) {
faf23422 2855 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2856
7e56b5d6 2857 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2858 goto out_free_request_sock_slab;
2859
6d6ee43e 2860 prot->twsk_prot->twsk_slab =
7e56b5d6 2861 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2862 prot->twsk_prot->twsk_obj_size,
3ab5aee7 2863 0,
52db70dc 2864 prot->slab_flags,
20c2df83 2865 NULL);
6d6ee43e 2866 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2867 goto out_free_timewait_sock_slab_name;
2868 }
1da177e4
LT		 2869 }
2870
36b77a52 2871 mutex_lock(&proto_list_mutex);
1da177e4 2872 list_add(&prot->node, &proto_list);
13ff3d6f 2873 assign_proto_idx(prot);
36b77a52 2874 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2875 return 0;
2876
8feaf0c0 2877out_free_timewait_sock_slab_name:
7e56b5d6 2878 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0 2879out_free_request_sock_slab:
0159dfd3
ED		 2880 req_prot_cleanup(prot->rsk_prot);
2881
2e6599cb
ACM		 2882 kmem_cache_destroy(prot->slab);
2883 prot->slab = NULL;
b733c007
PE		 2884out:
2885 return -ENOBUFS;
1da177e4 2886}
1da177e4
LT		 2887EXPORT_SYMBOL(proto_register);
2888
2889void proto_unregister(struct proto *prot)
2890{
36b77a52 2891 mutex_lock(&proto_list_mutex);
13ff3d6f 2892 release_proto_idx(prot);
0a3f4358 2893 list_del(&prot->node);
36b77a52 2894 mutex_unlock(&proto_list_mutex);
1da177e4 2895
adf78eda
JL		 2896 kmem_cache_destroy(prot->slab);
2897 prot->slab = NULL;
1da177e4 2898
0159dfd3 2899 req_prot_cleanup(prot->rsk_prot);
2e6599cb 2900
6d6ee43e 2901 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2902 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2903 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2904 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2905 }
1da177e4 2906}
1da177e4
LT		 2907EXPORT_SYMBOL(proto_unregister);
2908
2909#ifdef CONFIG_PROC_FS
1da177e4 2910static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2911 __acquires(proto_list_mutex)
1da177e4 2912{
36b77a52 2913 mutex_lock(&proto_list_mutex);
60f0438a 2914 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2915}
2916
2917static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2918{
60f0438a 2919 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2920}
2921
2922static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2923 __releases(proto_list_mutex)
1da177e4 2924{
36b77a52 2925 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2926}
2927
2928static char proto_method_implemented(const void *method)
2929{
2930 return method == NULL ? 'n' : 'y';
2931}
180d8cd9
GC		 2932static long sock_prot_memory_allocated(struct proto *proto)
2933{
cb75a36c 2934 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2935}
2936
2937static char *sock_prot_memory_pressure(struct proto *proto)
2938{
2939 return proto->memory_pressure != NULL ?
2940 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2941}
1da177e4
LT		 2942
2943static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2944{
180d8cd9 2945
8d987e5c 2946 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2947 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2948 proto->name,
2949 proto->obj_size,
14e943db 2950 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2951 sock_prot_memory_allocated(proto),
2952 sock_prot_memory_pressure(proto),
1da177e4
LT		 2953 proto->max_header,
2954 proto->slab == NULL ? "no" : "yes",
2955 module_name(proto->owner),
2956 proto_method_implemented(proto->close),
2957 proto_method_implemented(proto->connect),
2958 proto_method_implemented(proto->disconnect),
2959 proto_method_implemented(proto->accept),
2960 proto_method_implemented(proto->ioctl),
2961 proto_method_implemented(proto->init),
2962 proto_method_implemented(proto->destroy),
2963 proto_method_implemented(proto->shutdown),
2964 proto_method_implemented(proto->setsockopt),
2965 proto_method_implemented(proto->getsockopt),
2966 proto_method_implemented(proto->sendmsg),
2967 proto_method_implemented(proto->recvmsg),
2968 proto_method_implemented(proto->sendpage),
2969 proto_method_implemented(proto->bind),
2970 proto_method_implemented(proto->backlog_rcv),
2971 proto_method_implemented(proto->hash),
2972 proto_method_implemented(proto->unhash),
2973 proto_method_implemented(proto->get_port),
2974 proto_method_implemented(proto->enter_memory_pressure));
2975}
2976
2977static int proto_seq_show(struct seq_file *seq, void *v)
2978{
60f0438a 2979 if (v == &proto_list)
1da177e4
LT		 2980 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2981 "protocol",
2982 "size",
2983 "sockets",
2984 "memory",
2985 "press",
2986 "maxhdr",
2987 "slab",
2988 "module",
2989 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2990 else
60f0438a 2991 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2992 return 0;
2993}
2994
f690808e 2995static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2996 .start = proto_seq_start,
2997 .next = proto_seq_next,
2998 .stop = proto_seq_stop,
2999 .show = proto_seq_show,
3000};
3001
3002static int proto_seq_open(struct inode *inode, struct file *file)
3003{
14e943db
ED		 3004 return seq_open_net(inode, file, &proto_seq_ops,
3005 sizeof(struct seq_net_private));
1da177e4
LT		 3006}
3007
9a32144e 3008static const struct file_operations proto_seq_fops = {
1da177e4
LT		 3009 .owner = THIS_MODULE,
3010 .open = proto_seq_open,
3011 .read = seq_read,
3012 .llseek = seq_lseek,
14e943db
ED		 3013 .release = seq_release_net,
3014};
3015
3016static __net_init int proto_init_net(struct net *net)
3017{
d4beaa66 3018 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 3019 return -ENOMEM;
3020
3021 return 0;
3022}
3023
3024static __net_exit void proto_exit_net(struct net *net)
3025{
ece31ffd 3026 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 3027}
3028
3029
3030static __net_initdata struct pernet_operations proto_net_ops = {
3031 .init = proto_init_net,
3032 .exit = proto_exit_net,
1da177e4
LT		 3033};
3034
3035static int __init proto_init(void)
3036{
14e943db 3037 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 3038}
3039
3040subsys_initcall(proto_init);
3041
3042#endif /* PROC_FS */
Linux kernel - Deliverables
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