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bpf: verifier: add checks for BPF_ABS | BPF_IND instructions
[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>
1da177e4
LT		 134
135#include <linux/filter.h>
136
3847ce32
SM		 137#include <trace/events/sock.h>
138
1da177e4
LT		 139#ifdef CONFIG_INET
140#include <net/tcp.h>
141#endif
142
076bb0c8 143#include <net/busy_poll.h>
06021292 144
36b77a52 145static DEFINE_MUTEX(proto_list_mutex);
d1a4c0b3
GC		 146static LIST_HEAD(proto_list);
147
a3b299da
EB		 148/**
149 * sk_ns_capable - General socket capability test
150 * @sk: Socket to use a capability on or through
151 * @user_ns: The user namespace of the capability to use
152 * @cap: The capability to use
153 *
154 * Test to see if the opener of the socket had when the socket was
155 * created and the current process has the capability @cap in the user
156 * namespace @user_ns.
157 */
158bool sk_ns_capable(const struct sock *sk,
159 struct user_namespace *user_ns, int cap)
160{
161 return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
162 ns_capable(user_ns, cap);
163}
164EXPORT_SYMBOL(sk_ns_capable);
165
166/**
167 * sk_capable - Socket global capability test
168 * @sk: Socket to use a capability on or through
e793c0f7 169 * @cap: The global capability to use
a3b299da
EB		 170 *
171 * Test to see if the opener of the socket had when the socket was
172 * created and the current process has the capability @cap in all user
173 * namespaces.
174 */
175bool sk_capable(const struct sock *sk, int cap)
176{
177 return sk_ns_capable(sk, &init_user_ns, cap);
178}
179EXPORT_SYMBOL(sk_capable);
180
181/**
182 * sk_net_capable - Network namespace socket capability test
183 * @sk: Socket to use a capability on or through
184 * @cap: The capability to use
185 *
e793c0f7 186 * Test to see if the opener of the socket had when the socket was created
a3b299da
EB		 187 * and the current process has the capability @cap over the network namespace
188 * the socket is a member of.
189 */
190bool sk_net_capable(const struct sock *sk, int cap)
191{
192 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
193}
194EXPORT_SYMBOL(sk_net_capable);
195
196
c255a458 197#ifdef CONFIG_MEMCG_KMEM
1d62e436 198int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
d1a4c0b3
GC		 199{
200 struct proto *proto;
201 int ret = 0;
202
36b77a52 203 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 204 list_for_each_entry(proto, &proto_list, node) {
205 if (proto->init_cgroup) {
1d62e436 206 ret = proto->init_cgroup(memcg, ss);
d1a4c0b3
GC		 207 if (ret)
208 goto out;
209 }
210 }
211
36b77a52 212 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 213 return ret;
214out:
215 list_for_each_entry_continue_reverse(proto, &proto_list, node)
216 if (proto->destroy_cgroup)
1d62e436 217 proto->destroy_cgroup(memcg);
36b77a52 218 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 219 return ret;
220}
221
1d62e436 222void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
d1a4c0b3
GC		 223{
224 struct proto *proto;
225
36b77a52 226 mutex_lock(&proto_list_mutex);
d1a4c0b3
GC		 227 list_for_each_entry_reverse(proto, &proto_list, node)
228 if (proto->destroy_cgroup)
1d62e436 229 proto->destroy_cgroup(memcg);
36b77a52 230 mutex_unlock(&proto_list_mutex);
d1a4c0b3
GC		 231}
232#endif
233
da21f24d
IM		 234/*
235 * Each address family might have different locking rules, so we have
236 * one slock key per address family:
237 */
a5b5bb9a
IM		 238static struct lock_class_key af_family_keys[AF_MAX];
239static struct lock_class_key af_family_slock_keys[AF_MAX];
240
cbda4eaf 241#if defined(CONFIG_MEMCG_KMEM)
c5905afb 242struct static_key memcg_socket_limit_enabled;
e1aab161 243EXPORT_SYMBOL(memcg_socket_limit_enabled);
cbda4eaf 244#endif
e1aab161 245
a5b5bb9a
IM		 246/*
247 * Make lock validator output more readable. (we pre-construct these
248 * strings build-time, so that runtime initialization of socket
249 * locks is fast):
250 */
36cbd3dc 251static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 252 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
253 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
254 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
255 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
256 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
257 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
258 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 259 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 260 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 261 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 262 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 263 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
6f107b58 264 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
456db6a4 265 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
a5b5bb9a 266};
36cbd3dc 267static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 268 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
269 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
270 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
271 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
272 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
273 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
274 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 275 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 276 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 277 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 278 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 279 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
6f107b58 280 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
456db6a4 281 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
a5b5bb9a 282};
36cbd3dc 283static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 284 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
285 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
286 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
287 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
288 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
289 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
290 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 291 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 292 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 293 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 294 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 295 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
6f107b58 296 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
456db6a4 297 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
443aef0e 298};
da21f24d
IM		 299
300/*
301 * sk_callback_lock locking rules are per-address-family,
302 * so split the lock classes by using a per-AF key:
303 */
304static struct lock_class_key af_callback_keys[AF_MAX];
305
1da177e4
LT		 306/* Take into consideration the size of the struct sk_buff overhead in the
307 * determination of these values, since that is non-constant across
308 * platforms. This makes socket queueing behavior and performance
309 * not depend upon such differences.
310 */
311#define _SK_MEM_PACKETS 256
87fb4b7b 312#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
1da177e4
LT		 313#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
314#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
315
316/* Run time adjustable parameters. */
ab32ea5d 317__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
6d8ebc8a 318EXPORT_SYMBOL(sysctl_wmem_max);
ab32ea5d 319__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
6d8ebc8a 320EXPORT_SYMBOL(sysctl_rmem_max);
ab32ea5d
BH		 321__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
322__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4 323
25985edc 324/* Maximal space eaten by iovec or ancillary data plus some space */
ab32ea5d 325int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 326EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 327
c93bdd0e
MG		 328struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
329EXPORT_SYMBOL_GPL(memalloc_socks);
330
7cb02404
MG		 331/**
332 * sk_set_memalloc - sets %SOCK_MEMALLOC
333 * @sk: socket to set it on
334 *
335 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
336 * It's the responsibility of the admin to adjust min_free_kbytes
337 * to meet the requirements
338 */
339void sk_set_memalloc(struct sock *sk)
340{
341 sock_set_flag(sk, SOCK_MEMALLOC);
342 sk->sk_allocation |= __GFP_MEMALLOC;
c93bdd0e 343 static_key_slow_inc(&memalloc_socks);
7cb02404
MG		 344}
345EXPORT_SYMBOL_GPL(sk_set_memalloc);
346
347void sk_clear_memalloc(struct sock *sk)
348{
349 sock_reset_flag(sk, SOCK_MEMALLOC);
350 sk->sk_allocation &= ~__GFP_MEMALLOC;
c93bdd0e 351 static_key_slow_dec(&memalloc_socks);
c76562b6
MG		 352
353 /*
354 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
355 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
356 * it has rmem allocations there is a risk that the user of the
357 * socket cannot make forward progress due to exceeding the rmem
358 * limits. By rights, sk_clear_memalloc() should only be called
359 * on sockets being torn down but warn and reset the accounting if
360 * that assumption breaks.
361 */
362 if (WARN_ON(sk->sk_forward_alloc))
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
08e29af3
ED		 425#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
426
427static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
4ec93edb 428{
08e29af3
ED		 429 if (sk->sk_flags & flags) {
430 sk->sk_flags &= ~flags;
431 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
20d49473 432 net_disable_timestamp();
1da177e4
LT		 433 }
434}
435
436
f0088a50
DV		 437int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
438{
766e9037 439 int err;
3b885787
NH		 440 unsigned long flags;
441 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 442
0fd7bac6 443 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 444 atomic_inc(&sk->sk_drops);
3847ce32 445 trace_sock_rcvqueue_full(sk, skb);
766e9037 446 return -ENOMEM;
f0088a50
DV		 447 }
448
fda9ef5d 449 err = sk_filter(sk, skb);
f0088a50 450 if (err)
766e9037 451 return err;
f0088a50 452
c76562b6 453 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 454 atomic_inc(&sk->sk_drops);
455 return -ENOBUFS;
3ab224be
HA		 456 }
457
f0088a50
DV		 458 skb->dev = NULL;
459 skb_set_owner_r(skb, sk);
49ad9599 460
7fee226a
ED		 461 /* we escape from rcu protected region, make sure we dont leak
462 * a norefcounted dst
463 */
464 skb_dst_force(skb);
465
3b885787
NH		 466 spin_lock_irqsave(&list->lock, flags);
467 skb->dropcount = atomic_read(&sk->sk_drops);
468 __skb_queue_tail(list, skb);
469 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 470
471 if (!sock_flag(sk, SOCK_DEAD))
676d2369 472 sk->sk_data_ready(sk);
766e9037 473 return 0;
f0088a50
DV		 474}
475EXPORT_SYMBOL(sock_queue_rcv_skb);
476
58a5a7b9 477int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 478{
479 int rc = NET_RX_SUCCESS;
480
fda9ef5d 481 if (sk_filter(sk, skb))
f0088a50
DV		 482 goto discard_and_relse;
483
484 skb->dev = NULL;
485
274f482d 486 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 487 atomic_inc(&sk->sk_drops);
488 goto discard_and_relse;
489 }
58a5a7b9
ACM		 490 if (nested)
491 bh_lock_sock_nested(sk);
492 else
493 bh_lock_sock(sk);
a5b5bb9a
IM		 494 if (!sock_owned_by_user(sk)) {
495 /*
496 * trylock + unlock semantics:
497 */
498 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
499
c57943a1 500 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 501
502 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 503 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 504 bh_unlock_sock(sk);
505 atomic_inc(&sk->sk_drops);
506 goto discard_and_relse;
507 }
508
f0088a50
DV		 509 bh_unlock_sock(sk);
510out:
511 sock_put(sk);
512 return rc;
513discard_and_relse:
514 kfree_skb(skb);
515 goto out;
516}
517EXPORT_SYMBOL(sk_receive_skb);
518
519struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
520{
b6c6712a 521 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 522
523 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 524 sk_tx_queue_clear(sk);
a9b3cd7f 525 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 526 dst_release(dst);
527 return NULL;
528 }
529
530 return dst;
531}
532EXPORT_SYMBOL(__sk_dst_check);
533
534struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
535{
536 struct dst_entry *dst = sk_dst_get(sk);
537
538 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
539 sk_dst_reset(sk);
540 dst_release(dst);
541 return NULL;
542 }
543
544 return dst;
545}
546EXPORT_SYMBOL(sk_dst_check);
547
c91f6df2
BH		 548static int sock_setbindtodevice(struct sock *sk, char __user *optval,
549 int optlen)
4878809f
DM		 550{
551 int ret = -ENOPROTOOPT;
552#ifdef CONFIG_NETDEVICES
3b1e0a65 553 struct net *net = sock_net(sk);
4878809f
DM		 554 char devname[IFNAMSIZ];
555 int index;
556
557 /* Sorry... */
558 ret = -EPERM;
5e1fccc0 559 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 560 goto out;
561
562 ret = -EINVAL;
563 if (optlen < 0)
564 goto out;
565
566 /* Bind this socket to a particular device like "eth0",
567 * as specified in the passed interface name. If the
568 * name is "" or the option length is zero the socket
569 * is not bound.
570 */
571 if (optlen > IFNAMSIZ - 1)
572 optlen = IFNAMSIZ - 1;
573 memset(devname, 0, sizeof(devname));
574
575 ret = -EFAULT;
576 if (copy_from_user(devname, optval, optlen))
577 goto out;
578
000ba2e4
DM		 579 index = 0;
580 if (devname[0] != '\0') {
bf8e56bf 581 struct net_device *dev;
4878809f 582
bf8e56bf
ED		 583 rcu_read_lock();
584 dev = dev_get_by_name_rcu(net, devname);
585 if (dev)
586 index = dev->ifindex;
587 rcu_read_unlock();
4878809f
DM		 588 ret = -ENODEV;
589 if (!dev)
590 goto out;
4878809f
DM		 591 }
592
593 lock_sock(sk);
594 sk->sk_bound_dev_if = index;
595 sk_dst_reset(sk);
596 release_sock(sk);
597
598 ret = 0;
599
600out:
601#endif
602
603 return ret;
604}
605
c91f6df2
BH		 606static int sock_getbindtodevice(struct sock *sk, char __user *optval,
607 int __user *optlen, int len)
608{
609 int ret = -ENOPROTOOPT;
610#ifdef CONFIG_NETDEVICES
611 struct net *net = sock_net(sk);
c91f6df2 612 char devname[IFNAMSIZ];
c91f6df2
BH		 613
614 if (sk->sk_bound_dev_if == 0) {
615 len = 0;
616 goto zero;
617 }
618
619 ret = -EINVAL;
620 if (len < IFNAMSIZ)
621 goto out;
622
5dbe7c17
NS		 623 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
624 if (ret)
c91f6df2 625 goto out;
c91f6df2
BH		 626
627 len = strlen(devname) + 1;
628
629 ret = -EFAULT;
630 if (copy_to_user(optval, devname, len))
631 goto out;
632
633zero:
634 ret = -EFAULT;
635 if (put_user(len, optlen))
636 goto out;
637
638 ret = 0;
639
640out:
641#endif
642
643 return ret;
644}
645
c0ef877b
PE		 646static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
647{
648 if (valbool)
649 sock_set_flag(sk, bit);
650 else
651 sock_reset_flag(sk, bit);
652}
653
1da177e4
LT		 654/*
655 * This is meant for all protocols to use and covers goings on
656 * at the socket level. Everything here is generic.
657 */
658
659int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 660 char __user *optval, unsigned int optlen)
1da177e4 661{
2a91525c 662 struct sock *sk = sock->sk;
1da177e4
LT		 663 int val;
664 int valbool;
665 struct linger ling;
666 int ret = 0;
4ec93edb 667
1da177e4
LT		 668 /*
669 * Options without arguments
670 */
671
4878809f 672 if (optname == SO_BINDTODEVICE)
c91f6df2 673 return sock_setbindtodevice(sk, optval, optlen);
4878809f 674
e71a4783
SH		 675 if (optlen < sizeof(int))
676 return -EINVAL;
4ec93edb 677
1da177e4
LT		 678 if (get_user(val, (int __user *)optval))
679 return -EFAULT;
4ec93edb 680
2a91525c 681 valbool = val ? 1 : 0;
1da177e4
LT		 682
683 lock_sock(sk);
684
2a91525c 685 switch (optname) {
e71a4783 686 case SO_DEBUG:
2a91525c 687 if (val && !capable(CAP_NET_ADMIN))
e71a4783 688 ret = -EACCES;
2a91525c 689 else
c0ef877b 690 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 691 break;
692 case SO_REUSEADDR:
4a17fd52 693 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 694 break;
055dc21a
TH		 695 case SO_REUSEPORT:
696 sk->sk_reuseport = valbool;
697 break;
e71a4783 698 case SO_TYPE:
49c794e9 699 case SO_PROTOCOL:
0d6038ee 700 case SO_DOMAIN:
e71a4783
SH		 701 case SO_ERROR:
702 ret = -ENOPROTOOPT;
703 break;
704 case SO_DONTROUTE:
c0ef877b 705 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 706 break;
707 case SO_BROADCAST:
708 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
709 break;
710 case SO_SNDBUF:
711 /* Don't error on this BSD doesn't and if you think
82981930
ED		 712 * about it this is right. Otherwise apps have to
713 * play 'guess the biggest size' games. RCVBUF/SNDBUF
714 * are treated in BSD as hints
715 */
716 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 717set_sndbuf:
e71a4783 718 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 719 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
720 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 721 sk->sk_write_space(sk);
722 break;
1da177e4 723
e71a4783
SH		 724 case SO_SNDBUFFORCE:
725 if (!capable(CAP_NET_ADMIN)) {
726 ret = -EPERM;
727 break;
728 }
729 goto set_sndbuf;
b0573dea 730
e71a4783
SH		 731 case SO_RCVBUF:
732 /* Don't error on this BSD doesn't and if you think
82981930
ED		 733 * about it this is right. Otherwise apps have to
734 * play 'guess the biggest size' games. RCVBUF/SNDBUF
735 * are treated in BSD as hints
736 */
737 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 738set_rcvbuf:
e71a4783
SH		 739 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
740 /*
741 * We double it on the way in to account for
742 * "struct sk_buff" etc. overhead. Applications
743 * assume that the SO_RCVBUF setting they make will
744 * allow that much actual data to be received on that
745 * socket.
746 *
747 * Applications are unaware that "struct sk_buff" and
748 * other overheads allocate from the receive buffer
749 * during socket buffer allocation.
750 *
751 * And after considering the possible alternatives,
752 * returning the value we actually used in getsockopt
753 * is the most desirable behavior.
754 */
82981930 755 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 756 break;
757
758 case SO_RCVBUFFORCE:
759 if (!capable(CAP_NET_ADMIN)) {
760 ret = -EPERM;
1da177e4 761 break;
e71a4783
SH		 762 }
763 goto set_rcvbuf;
1da177e4 764
e71a4783 765 case SO_KEEPALIVE:
1da177e4 766#ifdef CONFIG_INET
3e10986d
ED		 767 if (sk->sk_protocol == IPPROTO_TCP &&
768 sk->sk_type == SOCK_STREAM)
e71a4783 769 tcp_set_keepalive(sk, valbool);
1da177e4 770#endif
e71a4783
SH		 771 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
772 break;
773
774 case SO_OOBINLINE:
775 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
776 break;
777
778 case SO_NO_CHECK:
28448b80 779 sk->sk_no_check_tx = valbool;
e71a4783
SH		 780 break;
781
782 case SO_PRIORITY:
5e1fccc0
EB		 783 if ((val >= 0 && val <= 6) ||
784 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 785 sk->sk_priority = val;
786 else
787 ret = -EPERM;
788 break;
789
790 case SO_LINGER:
791 if (optlen < sizeof(ling)) {
792 ret = -EINVAL; /* 1003.1g */
1da177e4 793 break;
e71a4783 794 }
2a91525c 795 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 796 ret = -EFAULT;
1da177e4 797 break;
e71a4783
SH		 798 }
799 if (!ling.l_onoff)
800 sock_reset_flag(sk, SOCK_LINGER);
801 else {
1da177e4 802#if (BITS_PER_LONG == 32)
e71a4783
SH		 803 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
804 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 805 else
e71a4783
SH		 806#endif
807 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
808 sock_set_flag(sk, SOCK_LINGER);
809 }
810 break;
811
812 case SO_BSDCOMPAT:
813 sock_warn_obsolete_bsdism("setsockopt");
814 break;
815
816 case SO_PASSCRED:
817 if (valbool)
818 set_bit(SOCK_PASSCRED, &sock->flags);
819 else
820 clear_bit(SOCK_PASSCRED, &sock->flags);
821 break;
822
823 case SO_TIMESTAMP:
92f37fd2 824 case SO_TIMESTAMPNS:
e71a4783 825 if (valbool) {
92f37fd2
ED		 826 if (optname == SO_TIMESTAMP)
827 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
828 else
829 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 830 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 831 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 832 } else {
e71a4783 833 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 834 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
835 }
e71a4783
SH		 836 break;
837
20d49473
PO		 838 case SO_TIMESTAMPING:
839 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 840 ret = -EINVAL;
20d49473
PO		 841 break;
842 }
09c2d251 843 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765
WB		 844 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
845 if (sk->sk_protocol == IPPROTO_TCP) {
846 if (sk->sk_state != TCP_ESTABLISHED) {
847 ret = -EINVAL;
848 break;
849 }
850 sk->sk_tskey = tcp_sk(sk)->snd_una;
851 } else {
852 sk->sk_tskey = 0;
853 }
854 }
b9f40e21 855 sk->sk_tsflags = val;
20d49473
PO		 856 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
857 sock_enable_timestamp(sk,
858 SOCK_TIMESTAMPING_RX_SOFTWARE);
859 else
860 sock_disable_timestamp(sk,
08e29af3 861 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 862 break;
863
e71a4783
SH		 864 case SO_RCVLOWAT:
865 if (val < 0)
866 val = INT_MAX;
867 sk->sk_rcvlowat = val ? : 1;
868 break;
869
870 case SO_RCVTIMEO:
871 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
872 break;
873
874 case SO_SNDTIMEO:
875 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
876 break;
1da177e4 877
e71a4783
SH		 878 case SO_ATTACH_FILTER:
879 ret = -EINVAL;
880 if (optlen == sizeof(struct sock_fprog)) {
881 struct sock_fprog fprog;
1da177e4 882
e71a4783
SH		 883 ret = -EFAULT;
884 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 885 break;
e71a4783
SH		 886
887 ret = sk_attach_filter(&fprog, sk);
888 }
889 break;
890
891 case SO_DETACH_FILTER:
55b33325 892 ret = sk_detach_filter(sk);
e71a4783 893 break;
1da177e4 894
d59577b6
VB		 895 case SO_LOCK_FILTER:
896 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
897 ret = -EPERM;
898 else
899 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
900 break;
901
e71a4783
SH		 902 case SO_PASSSEC:
903 if (valbool)
904 set_bit(SOCK_PASSSEC, &sock->flags);
905 else
906 clear_bit(SOCK_PASSSEC, &sock->flags);
907 break;
4a19ec58 908 case SO_MARK:
5e1fccc0 909 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 910 ret = -EPERM;
2a91525c 911 else
4a19ec58 912 sk->sk_mark = val;
4a19ec58 913 break;
877ce7c1 914
1da177e4
LT		 915 /* We implement the SO_SNDLOWAT etc to
916 not be settable (1003.1g 5.3) */
3b885787 917 case SO_RXQ_OVFL:
8083f0fc 918 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 919 break;
6e3e939f
JB		 920
921 case SO_WIFI_STATUS:
922 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
923 break;
924
ef64a54f
PE		 925 case SO_PEEK_OFF:
926 if (sock->ops->set_peek_off)
12663bfc 927 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 928 else
929 ret = -EOPNOTSUPP;
930 break;
3bdc0eba
BG		 931
932 case SO_NOFCS:
933 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
934 break;
935
7d4c04fc
KJ		 936 case SO_SELECT_ERR_QUEUE:
937 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
938 break;
939
e0d1095a 940#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 941 case SO_BUSY_POLL:
dafcc438
ET		 942 /* allow unprivileged users to decrease the value */
943 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
944 ret = -EPERM;
945 else {
946 if (val < 0)
947 ret = -EINVAL;
948 else
949 sk->sk_ll_usec = val;
950 }
951 break;
952#endif
62748f32
ED		 953
954 case SO_MAX_PACING_RATE:
955 sk->sk_max_pacing_rate = val;
956 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
957 sk->sk_max_pacing_rate);
958 break;
959
e71a4783
SH		 960 default:
961 ret = -ENOPROTOOPT;
962 break;
4ec93edb 963 }
1da177e4
LT		 964 release_sock(sk);
965 return ret;
966}
2a91525c 967EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 968
969
8f09898b 970static void cred_to_ucred(struct pid *pid, const struct cred *cred,
971 struct ucred *ucred)
3f551f94
EB		 972{
973 ucred->pid = pid_vnr(pid);
974 ucred->uid = ucred->gid = -1;
975 if (cred) {
976 struct user_namespace *current_ns = current_user_ns();
977
b2e4f544
EB		 978 ucred->uid = from_kuid_munged(current_ns, cred->euid);
979 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 980 }
981}
982
1da177e4
LT		 983int sock_getsockopt(struct socket *sock, int level, int optname,
984 char __user *optval, int __user *optlen)
985{
986 struct sock *sk = sock->sk;
4ec93edb 987
e71a4783 988 union {
4ec93edb
YH		 989 int val;
990 struct linger ling;
1da177e4
LT		 991 struct timeval tm;
992 } v;
4ec93edb 993
4d0392be 994 int lv = sizeof(int);
1da177e4 995 int len;
4ec93edb 996
e71a4783 997 if (get_user(len, optlen))
4ec93edb 998 return -EFAULT;
e71a4783 999 if (len < 0)
1da177e4 1000 return -EINVAL;
4ec93edb 1001
50fee1de 1002 memset(&v, 0, sizeof(v));
df0bca04 1003
2a91525c 1004 switch (optname) {
e71a4783
SH		 1005 case SO_DEBUG:
1006 v.val = sock_flag(sk, SOCK_DBG);
1007 break;
1008
1009 case SO_DONTROUTE:
1010 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1011 break;
1012
1013 case SO_BROADCAST:
1b23a5df 1014 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1015 break;
1016
1017 case SO_SNDBUF:
1018 v.val = sk->sk_sndbuf;
1019 break;
1020
1021 case SO_RCVBUF:
1022 v.val = sk->sk_rcvbuf;
1023 break;
1024
1025 case SO_REUSEADDR:
1026 v.val = sk->sk_reuse;
1027 break;
1028
055dc21a
TH		 1029 case SO_REUSEPORT:
1030 v.val = sk->sk_reuseport;
1031 break;
1032
e71a4783 1033 case SO_KEEPALIVE:
1b23a5df 1034 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1035 break;
1036
1037 case SO_TYPE:
1038 v.val = sk->sk_type;
1039 break;
1040
49c794e9
JE		 1041 case SO_PROTOCOL:
1042 v.val = sk->sk_protocol;
1043 break;
1044
0d6038ee
JE		 1045 case SO_DOMAIN:
1046 v.val = sk->sk_family;
1047 break;
1048
e71a4783
SH		 1049 case SO_ERROR:
1050 v.val = -sock_error(sk);
2a91525c 1051 if (v.val == 0)
e71a4783
SH		 1052 v.val = xchg(&sk->sk_err_soft, 0);
1053 break;
1054
1055 case SO_OOBINLINE:
1b23a5df 1056 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1057 break;
1058
1059 case SO_NO_CHECK:
28448b80 1060 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1061 break;
1062
1063 case SO_PRIORITY:
1064 v.val = sk->sk_priority;
1065 break;
1066
1067 case SO_LINGER:
1068 lv = sizeof(v.ling);
1b23a5df 1069 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1070 v.ling.l_linger = sk->sk_lingertime / HZ;
1071 break;
1072
1073 case SO_BSDCOMPAT:
1074 sock_warn_obsolete_bsdism("getsockopt");
1075 break;
1076
1077 case SO_TIMESTAMP:
92f37fd2
ED		 1078 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1079 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1080 break;
1081
1082 case SO_TIMESTAMPNS:
1083 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1084 break;
1085
20d49473 1086 case SO_TIMESTAMPING:
b9f40e21 1087 v.val = sk->sk_tsflags;
20d49473
PO		 1088 break;
1089
e71a4783 1090 case SO_RCVTIMEO:
2a91525c 1091 lv = sizeof(struct timeval);
e71a4783
SH		 1092 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1093 v.tm.tv_sec = 0;
1094 v.tm.tv_usec = 0;
1095 } else {
1096 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1097 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1098 }
1099 break;
1100
1101 case SO_SNDTIMEO:
2a91525c 1102 lv = sizeof(struct timeval);
e71a4783
SH		 1103 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1104 v.tm.tv_sec = 0;
1105 v.tm.tv_usec = 0;
1106 } else {
1107 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1108 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1109 }
1110 break;
1da177e4 1111
e71a4783
SH		 1112 case SO_RCVLOWAT:
1113 v.val = sk->sk_rcvlowat;
1114 break;
1da177e4 1115
e71a4783 1116 case SO_SNDLOWAT:
2a91525c 1117 v.val = 1;
e71a4783 1118 break;
1da177e4 1119
e71a4783 1120 case SO_PASSCRED:
82981930 1121 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1122 break;
1da177e4 1123
e71a4783 1124 case SO_PEERCRED:
109f6e39
EB		 1125 {
1126 struct ucred peercred;
1127 if (len > sizeof(peercred))
1128 len = sizeof(peercred);
1129 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1130 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1131 return -EFAULT;
1132 goto lenout;
109f6e39 1133 }
1da177e4 1134
e71a4783
SH		 1135 case SO_PEERNAME:
1136 {
1137 char address[128];
1138
1139 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1140 return -ENOTCONN;
1141 if (lv < len)
1142 return -EINVAL;
1143 if (copy_to_user(optval, address, len))
1144 return -EFAULT;
1145 goto lenout;
1146 }
1da177e4 1147
e71a4783
SH		 1148 /* Dubious BSD thing... Probably nobody even uses it, but
1149 * the UNIX standard wants it for whatever reason... -DaveM
1150 */
1151 case SO_ACCEPTCONN:
1152 v.val = sk->sk_state == TCP_LISTEN;
1153 break;
1da177e4 1154
e71a4783 1155 case SO_PASSSEC:
82981930 1156 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1157 break;
877ce7c1 1158
e71a4783
SH		 1159 case SO_PEERSEC:
1160 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1161
4a19ec58
LAT		 1162 case SO_MARK:
1163 v.val = sk->sk_mark;
1164 break;
1165
3b885787 1166 case SO_RXQ_OVFL:
1b23a5df 1167 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1168 break;
1169
6e3e939f 1170 case SO_WIFI_STATUS:
1b23a5df 1171 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1172 break;
1173
ef64a54f
PE		 1174 case SO_PEEK_OFF:
1175 if (!sock->ops->set_peek_off)
1176 return -EOPNOTSUPP;
1177
1178 v.val = sk->sk_peek_off;
1179 break;
bc2f7996 1180 case SO_NOFCS:
1b23a5df 1181 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1182 break;
c91f6df2 1183
f7b86bfe 1184 case SO_BINDTODEVICE:
c91f6df2
BH		 1185 return sock_getbindtodevice(sk, optval, optlen, len);
1186
a8fc9277
PE		 1187 case SO_GET_FILTER:
1188 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1189 if (len < 0)
1190 return len;
1191
1192 goto lenout;
c91f6df2 1193
d59577b6
VB		 1194 case SO_LOCK_FILTER:
1195 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1196 break;
1197
ea02f941
MS		 1198 case SO_BPF_EXTENSIONS:
1199 v.val = bpf_tell_extensions();
1200 break;
1201
7d4c04fc
KJ		 1202 case SO_SELECT_ERR_QUEUE:
1203 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1204 break;
1205
e0d1095a 1206#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1207 case SO_BUSY_POLL:
dafcc438
ET		 1208 v.val = sk->sk_ll_usec;
1209 break;
1210#endif
1211
62748f32
ED		 1212 case SO_MAX_PACING_RATE:
1213 v.val = sk->sk_max_pacing_rate;
1214 break;
1215
2c8c56e1
ED		 1216 case SO_INCOMING_CPU:
1217 v.val = sk->sk_incoming_cpu;
1218 break;
1219
e71a4783
SH		 1220 default:
1221 return -ENOPROTOOPT;
1da177e4 1222 }
e71a4783 1223
1da177e4
LT		 1224 if (len > lv)
1225 len = lv;
1226 if (copy_to_user(optval, &v, len))
1227 return -EFAULT;
1228lenout:
4ec93edb
YH		 1229 if (put_user(len, optlen))
1230 return -EFAULT;
1231 return 0;
1da177e4
LT		 1232}
1233
a5b5bb9a
IM		 1234/*
1235 * Initialize an sk_lock.
1236 *
1237 * (We also register the sk_lock with the lock validator.)
1238 */
b6f99a21 1239static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1240{
ed07536e
PZ		 1241 sock_lock_init_class_and_name(sk,
1242 af_family_slock_key_strings[sk->sk_family],
1243 af_family_slock_keys + sk->sk_family,
1244 af_family_key_strings[sk->sk_family],
1245 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1246}
1247
4dc6dc71
ED		 1248/*
1249 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1250 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1251 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1252 */
f1a6c4da
PE		 1253static void sock_copy(struct sock *nsk, const struct sock *osk)
1254{
1255#ifdef CONFIG_SECURITY_NETWORK
1256 void *sptr = nsk->sk_security;
1257#endif
68835aba
ED		 1258 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1259
1260 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1261 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1262
f1a6c4da
PE		 1263#ifdef CONFIG_SECURITY_NETWORK
1264 nsk->sk_security = sptr;
1265 security_sk_clone(osk, nsk);
1266#endif
1267}
1268
fcbdf09d
OP		 1269void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1270{
1271 unsigned long nulls1, nulls2;
1272
1273 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1274 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1275 if (nulls1 > nulls2)
1276 swap(nulls1, nulls2);
1277
1278 if (nulls1 != 0)
1279 memset((char *)sk, 0, nulls1);
1280 memset((char *)sk + nulls1 + sizeof(void *), 0,
1281 nulls2 - nulls1 - sizeof(void *));
1282 memset((char *)sk + nulls2 + sizeof(void *), 0,
1283 size - nulls2 - sizeof(void *));
1284}
1285EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1286
2e4afe7b
PE		 1287static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1288 int family)
c308c1b2
PE		 1289{
1290 struct sock *sk;
1291 struct kmem_cache *slab;
1292
1293 slab = prot->slab;
e912b114
ED		 1294 if (slab != NULL) {
1295 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1296 if (!sk)
1297 return sk;
1298 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1299 if (prot->clear_sk)
1300 prot->clear_sk(sk, prot->obj_size);
1301 else
1302 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1303 }
fcbdf09d 1304 } else
c308c1b2
PE		 1305 sk = kmalloc(prot->obj_size, priority);
1306
2e4afe7b 1307 if (sk != NULL) {
a98b65a3
VN		 1308 kmemcheck_annotate_bitfield(sk, flags);
1309
2e4afe7b
PE		 1310 if (security_sk_alloc(sk, family, priority))
1311 goto out_free;
1312
1313 if (!try_module_get(prot->owner))
1314 goto out_free_sec;
e022f0b4 1315 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1316 }
1317
c308c1b2 1318 return sk;
2e4afe7b
PE		 1319
1320out_free_sec:
1321 security_sk_free(sk);
1322out_free:
1323 if (slab != NULL)
1324 kmem_cache_free(slab, sk);
1325 else
1326 kfree(sk);
1327 return NULL;
c308c1b2
PE		 1328}
1329
1330static void sk_prot_free(struct proto *prot, struct sock *sk)
1331{
1332 struct kmem_cache *slab;
2e4afe7b 1333 struct module *owner;
c308c1b2 1334
2e4afe7b 1335 owner = prot->owner;
c308c1b2 1336 slab = prot->slab;
2e4afe7b
PE		 1337
1338 security_sk_free(sk);
c308c1b2
PE		 1339 if (slab != NULL)
1340 kmem_cache_free(slab, sk);
1341 else
1342 kfree(sk);
2e4afe7b 1343 module_put(owner);
c308c1b2
PE		 1344}
1345
86f8515f 1346#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
6ffd4641 1347void sock_update_netprioidx(struct sock *sk)
5bc1421e 1348{
5bc1421e
NH		 1349 if (in_interrupt())
1350 return;
2b73bc65 1351
6ffd4641 1352 sk->sk_cgrp_prioidx = task_netprioidx(current);
5bc1421e
NH		 1353}
1354EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1355#endif
1356
1da177e4
LT		 1357/**
1358 * sk_alloc - All socket objects are allocated here
c4ea43c5 1359 * @net: the applicable net namespace
4dc3b16b
PP		 1360 * @family: protocol family
1361 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1362 * @prot: struct proto associated with this new sock instance
1da177e4 1363 */
1b8d7ae4 1364struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1365 struct proto *prot)
1da177e4 1366{
c308c1b2 1367 struct sock *sk;
1da177e4 1368
154adbc8 1369 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1370 if (sk) {
154adbc8
PE		 1371 sk->sk_family = family;
1372 /*
1373 * See comment in struct sock definition to understand
1374 * why we need sk_prot_creator -acme
1375 */
1376 sk->sk_prot = sk->sk_prot_creator = prot;
1377 sock_lock_init(sk);
3b1e0a65 1378 sock_net_set(sk, get_net(net));
d66ee058 1379 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1380
211d2f97 1381 sock_update_classid(sk);
6ffd4641 1382 sock_update_netprioidx(sk);
1da177e4 1383 }
a79af59e 1384
2e4afe7b 1385 return sk;
1da177e4 1386}
2a91525c 1387EXPORT_SYMBOL(sk_alloc);
1da177e4 1388
2b85a34e 1389static void __sk_free(struct sock *sk)
1da177e4
LT		 1390{
1391 struct sk_filter *filter;
1da177e4
LT		 1392
1393 if (sk->sk_destruct)
1394 sk->sk_destruct(sk);
1395
a898def2
PM		 1396 filter = rcu_dereference_check(sk->sk_filter,
1397 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1398 if (filter) {
309dd5fc 1399 sk_filter_uncharge(sk, filter);
a9b3cd7f 1400 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1401 }
1402
08e29af3 1403 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1404
1405 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1406 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1407 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1408
109f6e39
EB		 1409 if (sk->sk_peer_cred)
1410 put_cred(sk->sk_peer_cred);
1411 put_pid(sk->sk_peer_pid);
3b1e0a65 1412 put_net(sock_net(sk));
c308c1b2 1413 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1414}
2b85a34e
ED		 1415
1416void sk_free(struct sock *sk)
1417{
1418 /*
25985edc 1419 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1420 * some packets are still in some tx queue.
1421 * If not null, sock_wfree() will call __sk_free(sk) later
1422 */
1423 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1424 __sk_free(sk);
1425}
2a91525c 1426EXPORT_SYMBOL(sk_free);
1da177e4 1427
edf02087 1428/*
25985edc
LDM		 1429 * Last sock_put should drop reference to sk->sk_net. It has already
1430 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1431 * is not an option.
25985edc 1432 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1433 * destroy it in the context of init_net.
1434 */
1435void sk_release_kernel(struct sock *sk)
1436{
1437 if (sk == NULL || sk->sk_socket == NULL)
1438 return;
1439
1440 sock_hold(sk);
1441 sock_release(sk->sk_socket);
65a18ec5 1442 release_net(sock_net(sk));
3b1e0a65 1443 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1444 sock_put(sk);
1445}
45af1754 1446EXPORT_SYMBOL(sk_release_kernel);
edf02087 1447
475f1b52
SR		 1448static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1449{
1450 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1451 sock_update_memcg(newsk);
1452}
1453
e56c57d0
ED		 1454/**
1455 * sk_clone_lock - clone a socket, and lock its clone
1456 * @sk: the socket to clone
1457 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1458 *
1459 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1460 */
1461struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1462{
8fd1d178 1463 struct sock *newsk;
278571ba 1464 bool is_charged = true;
87d11ceb 1465
8fd1d178 1466 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1467 if (newsk != NULL) {
1468 struct sk_filter *filter;
1469
892c141e 1470 sock_copy(newsk, sk);
87d11ceb
ACM		 1471
1472 /* SANITY */
3b1e0a65 1473 get_net(sock_net(newsk));
87d11ceb
ACM		 1474 sk_node_init(&newsk->sk_node);
1475 sock_lock_init(newsk);
1476 bh_lock_sock(newsk);
fa438ccf 1477 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1478 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1479
1480 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1481 /*
1482 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1483 */
1484 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1485 atomic_set(&newsk->sk_omem_alloc, 0);
1486 skb_queue_head_init(&newsk->sk_receive_queue);
1487 skb_queue_head_init(&newsk->sk_write_queue);
1488
b6c6712a 1489 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1490 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1491 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1492 af_callback_keys + newsk->sk_family,
1493 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1494
1495 newsk->sk_dst_cache = NULL;
1496 newsk->sk_wmem_queued = 0;
1497 newsk->sk_forward_alloc = 0;
1498 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1499 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1500
1501 sock_reset_flag(newsk, SOCK_DONE);
1502 skb_queue_head_init(&newsk->sk_error_queue);
1503
0d7da9dd 1504 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1505 if (filter != NULL)
278571ba
AS		 1506 /* though it's an empty new sock, the charging may fail
1507 * if sysctl_optmem_max was changed between creation of
1508 * original socket and cloning
1509 */
1510 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1511
278571ba 1512 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk))) {
87d11ceb
ACM		 1513 /* It is still raw copy of parent, so invalidate
1514 * destructor and make plain sk_free() */
1515 newsk->sk_destruct = NULL;
b0691c8e 1516 bh_unlock_sock(newsk);
87d11ceb
ACM		 1517 sk_free(newsk);
1518 newsk = NULL;
1519 goto out;
1520 }
1521
1522 newsk->sk_err = 0;
1523 newsk->sk_priority = 0;
2c8c56e1 1524 newsk->sk_incoming_cpu = raw_smp_processor_id();
4dc6dc71
ED		 1525 /*
1526 * Before updating sk_refcnt, we must commit prior changes to memory
1527 * (Documentation/RCU/rculist_nulls.txt for details)
1528 */
1529 smp_wmb();
87d11ceb
ACM		 1530 atomic_set(&newsk->sk_refcnt, 2);
1531
1532 /*
1533 * Increment the counter in the same struct proto as the master
1534 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1535 * is the same as sk->sk_prot->socks, as this field was copied
1536 * with memcpy).
1537 *
1538 * This _changes_ the previous behaviour, where
1539 * tcp_create_openreq_child always was incrementing the
1540 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1541 * to be taken into account in all callers. -acme
1542 */
1543 sk_refcnt_debug_inc(newsk);
972692e0 1544 sk_set_socket(newsk, NULL);
43815482 1545 newsk->sk_wq = NULL;
87d11ceb 1546
f3f511e1
GC		 1547 sk_update_clone(sk, newsk);
1548
87d11ceb 1549 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1550 sk_sockets_allocated_inc(newsk);
704da560 1551
08e29af3 1552 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1553 net_enable_timestamp();
87d11ceb
ACM		 1554 }
1555out:
1556 return newsk;
1557}
e56c57d0 1558EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1559
9958089a
AK		 1560void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1561{
1562 __sk_dst_set(sk, dst);
1563 sk->sk_route_caps = dst->dev->features;
1564 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1565 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1566 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1567 if (sk_can_gso(sk)) {
82cc1a7a 1568 if (dst->header_len) {
9958089a 1569 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1570 } else {
9958089a 1571 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1572 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1573 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1574 }
9958089a
AK		 1575 }
1576}
1577EXPORT_SYMBOL_GPL(sk_setup_caps);
1578
1da177e4
LT		 1579/*
1580 * Simple resource managers for sockets.
1581 */
1582
1583
4ec93edb
YH		 1584/*
1585 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1586 */
1587void sock_wfree(struct sk_buff *skb)
1588{
1589 struct sock *sk = skb->sk;
d99927f4 1590 unsigned int len = skb->truesize;
1da177e4 1591
d99927f4
ED		 1592 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1593 /*
1594 * Keep a reference on sk_wmem_alloc, this will be released
1595 * after sk_write_space() call
1596 */
1597 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1598 sk->sk_write_space(sk);
d99927f4
ED		 1599 len = 1;
1600 }
2b85a34e 1601 /*
d99927f4
ED		 1602 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1603 * could not do because of in-flight packets
2b85a34e 1604 */
d99927f4 1605 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1606 __sk_free(sk);
1da177e4 1607}
2a91525c 1608EXPORT_SYMBOL(sock_wfree);
1da177e4 1609
f2f872f9
ED		 1610void skb_orphan_partial(struct sk_buff *skb)
1611{
1612 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1613 * so we do not completely orphan skb, but transfert all
1614 * accounted bytes but one, to avoid unexpected reorders.
1615 */
1616 if (skb->destructor == sock_wfree
1617#ifdef CONFIG_INET
1618 || skb->destructor == tcp_wfree
1619#endif
1620 ) {
1621 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1622 skb->truesize = 1;
1623 } else {
1624 skb_orphan(skb);
1625 }
1626}
1627EXPORT_SYMBOL(skb_orphan_partial);
1628
4ec93edb
YH		 1629/*
1630 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1631 */
1632void sock_rfree(struct sk_buff *skb)
1633{
1634 struct sock *sk = skb->sk;
d361fd59 1635 unsigned int len = skb->truesize;
1da177e4 1636
d361fd59
ED		 1637 atomic_sub(len, &sk->sk_rmem_alloc);
1638 sk_mem_uncharge(sk, len);
1da177e4 1639}
2a91525c 1640EXPORT_SYMBOL(sock_rfree);
1da177e4 1641
62bccb8c
AD		 1642void sock_efree(struct sk_buff *skb)
1643{
1644 sock_put(skb->sk);
1645}
1646EXPORT_SYMBOL(sock_efree);
1647
82eabd9e 1648#ifdef CONFIG_INET
41063e9d
DM		 1649void sock_edemux(struct sk_buff *skb)
1650{
e812347c
ED		 1651 struct sock *sk = skb->sk;
1652
1653 if (sk->sk_state == TCP_TIME_WAIT)
1654 inet_twsk_put(inet_twsk(sk));
1655 else
1656 sock_put(sk);
41063e9d
DM		 1657}
1658EXPORT_SYMBOL(sock_edemux);
82eabd9e 1659#endif
1da177e4 1660
976d0201 1661kuid_t sock_i_uid(struct sock *sk)
1da177e4 1662{
976d0201 1663 kuid_t uid;
1da177e4 1664
f064af1e 1665 read_lock_bh(&sk->sk_callback_lock);
976d0201 1666 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
f064af1e 1667 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1668 return uid;
1669}
2a91525c 1670EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1671
1672unsigned long sock_i_ino(struct sock *sk)
1673{
1674 unsigned long ino;
1675
f064af1e 1676 read_lock_bh(&sk->sk_callback_lock);
1da177e4 1677 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
f064af1e 1678 read_unlock_bh(&sk->sk_callback_lock);
1da177e4
LT		 1679 return ino;
1680}
2a91525c 1681EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1682
1683/*
1684 * Allocate a skb from the socket's send buffer.
1685 */
86a76caf 1686struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1687 gfp_t priority)
1da177e4
LT		 1688{
1689 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1690 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1691 if (skb) {
1692 skb_set_owner_w(skb, sk);
1693 return skb;
1694 }
1695 }
1696 return NULL;
1697}
2a91525c 1698EXPORT_SYMBOL(sock_wmalloc);
1da177e4 1699
4ec93edb 1700/*
1da177e4 1701 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1702 */
dd0fc66f 1703void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4 1704{
95c96174 1705 if ((unsigned int)size <= sysctl_optmem_max &&
1da177e4
LT		 1706 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1707 void *mem;
1708 /* First do the add, to avoid the race if kmalloc
4ec93edb 1709 * might sleep.
1da177e4
LT		 1710 */
1711 atomic_add(size, &sk->sk_omem_alloc);
1712 mem = kmalloc(size, priority);
1713 if (mem)
1714 return mem;
1715 atomic_sub(size, &sk->sk_omem_alloc);
1716 }
1717 return NULL;
1718}
2a91525c 1719EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1720
1721/*
1722 * Free an option memory block.
1723 */
1724void sock_kfree_s(struct sock *sk, void *mem, int size)
1725{
e53da5fb
DM		 1726 if (WARN_ON_ONCE(!mem))
1727 return;
1da177e4
LT		 1728 kfree(mem);
1729 atomic_sub(size, &sk->sk_omem_alloc);
1730}
2a91525c 1731EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1732
1733/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1734 I think, these locks should be removed for datagram sockets.
1735 */
2a91525c 1736static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1737{
1738 DEFINE_WAIT(wait);
1739
1740 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1741 for (;;) {
1742 if (!timeo)
1743 break;
1744 if (signal_pending(current))
1745 break;
1746 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1747 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1748 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1749 break;
1750 if (sk->sk_shutdown & SEND_SHUTDOWN)
1751 break;
1752 if (sk->sk_err)
1753 break;
1754 timeo = schedule_timeout(timeo);
1755 }
aa395145 1756 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1757 return timeo;
1758}
1759
1760
1761/*
1762 * Generic send/receive buffer handlers
1763 */
1764
4cc7f68d
HX		 1765struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1766 unsigned long data_len, int noblock,
28d64271 1767 int *errcode, int max_page_order)
1da177e4 1768{
2e4e4410 1769 struct sk_buff *skb;
1da177e4
LT		 1770 long timeo;
1771 int err;
1772
1da177e4 1773 timeo = sock_sndtimeo(sk, noblock);
2e4e4410 1774 for (;;) {
1da177e4
LT		 1775 err = sock_error(sk);
1776 if (err != 0)
1777 goto failure;
1778
1779 err = -EPIPE;
1780 if (sk->sk_shutdown & SEND_SHUTDOWN)
1781 goto failure;
1782
2e4e4410
ED		 1783 if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
1784 break;
28d64271 1785
2e4e4410
ED		 1786 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1787 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1788 err = -EAGAIN;
1789 if (!timeo)
1da177e4 1790 goto failure;
2e4e4410
ED		 1791 if (signal_pending(current))
1792 goto interrupted;
1793 timeo = sock_wait_for_wmem(sk, timeo);
1da177e4 1794 }
2e4e4410
ED		 1795 skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
1796 errcode, sk->sk_allocation);
1797 if (skb)
1798 skb_set_owner_w(skb, sk);
1da177e4
LT		 1799 return skb;
1800
1801interrupted:
1802 err = sock_intr_errno(timeo);
1803failure:
1804 *errcode = err;
1805 return NULL;
1806}
4cc7f68d 1807EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1808
4ec93edb 1809struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1810 int noblock, int *errcode)
1811{
28d64271 1812 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1813}
2a91525c 1814EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1815
5640f768
ED		 1816/* On 32bit arches, an skb frag is limited to 2^15 */
1817#define SKB_FRAG_PAGE_ORDER get_order(32768)
1818
400dfd3a
ED		 1819/**
1820 * skb_page_frag_refill - check that a page_frag contains enough room
1821 * @sz: minimum size of the fragment we want to get
1822 * @pfrag: pointer to page_frag
82d5e2b8 1823 * @gfp: priority for memory allocation
400dfd3a
ED		 1824 *
1825 * Note: While this allocator tries to use high order pages, there is
1826 * no guarantee that allocations succeed. Therefore, @sz MUST be
1827 * less or equal than PAGE_SIZE.
1828 */
d9b2938a 1829bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1830{
5640f768
ED		 1831 if (pfrag->page) {
1832 if (atomic_read(&pfrag->page->_count) == 1) {
1833 pfrag->offset = 0;
1834 return true;
1835 }
400dfd3a 1836 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1837 return true;
1838 put_page(pfrag->page);
1839 }
1840
d9b2938a
ED		 1841 pfrag->offset = 0;
1842 if (SKB_FRAG_PAGE_ORDER) {
1843 pfrag->page = alloc_pages(gfp | __GFP_COMP |
1844 __GFP_NOWARN | __GFP_NORETRY,
1845 SKB_FRAG_PAGE_ORDER);
5640f768 1846 if (likely(pfrag->page)) {
d9b2938a 1847 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 1848 return true;
1849 }
d9b2938a
ED		 1850 }
1851 pfrag->page = alloc_page(gfp);
1852 if (likely(pfrag->page)) {
1853 pfrag->size = PAGE_SIZE;
1854 return true;
1855 }
400dfd3a
ED		 1856 return false;
1857}
1858EXPORT_SYMBOL(skb_page_frag_refill);
1859
1860bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1861{
1862 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1863 return true;
1864
5640f768
ED		 1865 sk_enter_memory_pressure(sk);
1866 sk_stream_moderate_sndbuf(sk);
1867 return false;
1868}
1869EXPORT_SYMBOL(sk_page_frag_refill);
1870
1da177e4 1871static void __lock_sock(struct sock *sk)
f39234d6
NK		 1872 __releases(&sk->sk_lock.slock)
1873 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1874{
1875 DEFINE_WAIT(wait);
1876
e71a4783 1877 for (;;) {
1da177e4
LT		 1878 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1879 TASK_UNINTERRUPTIBLE);
1880 spin_unlock_bh(&sk->sk_lock.slock);
1881 schedule();
1882 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1883 if (!sock_owned_by_user(sk))
1da177e4
LT		 1884 break;
1885 }
1886 finish_wait(&sk->sk_lock.wq, &wait);
1887}
1888
1889static void __release_sock(struct sock *sk)
f39234d6
NK		 1890 __releases(&sk->sk_lock.slock)
1891 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1892{
1893 struct sk_buff *skb = sk->sk_backlog.head;
1894
1895 do {
1896 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1897 bh_unlock_sock(sk);
1898
1899 do {
1900 struct sk_buff *next = skb->next;
1901
e4cbb02a 1902 prefetch(next);
7fee226a 1903 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1904 skb->next = NULL;
c57943a1 1905 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1906
1907 /*
1908 * We are in process context here with softirqs
1909 * disabled, use cond_resched_softirq() to preempt.
1910 * This is safe to do because we've taken the backlog
1911 * queue private:
1912 */
1913 cond_resched_softirq();
1914
1915 skb = next;
1916 } while (skb != NULL);
1917
1918 bh_lock_sock(sk);
e71a4783 1919 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1920
1921 /*
1922 * Doing the zeroing here guarantee we can not loop forever
1923 * while a wild producer attempts to flood us.
1924 */
1925 sk->sk_backlog.len = 0;
1da177e4
LT		 1926}
1927
1928/**
1929 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1930 * @sk: sock to wait on
1931 * @timeo: for how long
1da177e4
LT		 1932 *
1933 * Now socket state including sk->sk_err is changed only under lock,
1934 * hence we may omit checks after joining wait queue.
1935 * We check receive queue before schedule() only as optimization;
1936 * it is very likely that release_sock() added new data.
1937 */
1938int sk_wait_data(struct sock *sk, long *timeo)
1939{
1940 int rc;
1941 DEFINE_WAIT(wait);
1942
aa395145 1943 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1944 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1945 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1946 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1947 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1948 return rc;
1949}
1da177e4
LT		 1950EXPORT_SYMBOL(sk_wait_data);
1951
3ab224be
HA		 1952/**
1953 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1954 * @sk: socket
1955 * @size: memory size to allocate
1956 * @kind: allocation type
1957 *
1958 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1959 * rmem allocation. This function assumes that protocols which have
1960 * memory_pressure use sk_wmem_queued as write buffer accounting.
1961 */
1962int __sk_mem_schedule(struct sock *sk, int size, int kind)
1963{
1964 struct proto *prot = sk->sk_prot;
1965 int amt = sk_mem_pages(size);
8d987e5c 1966 long allocated;
e1aab161 1967 int parent_status = UNDER_LIMIT;
3ab224be
HA		 1968
1969 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 1970
e1aab161 1971 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 1972
1973 /* Under limit. */
e1aab161
GC		 1974 if (parent_status == UNDER_LIMIT &&
1975 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 1976 sk_leave_memory_pressure(sk);
3ab224be
HA		 1977 return 1;
1978 }
1979
e1aab161
GC		 1980 /* Under pressure. (we or our parents) */
1981 if ((parent_status > SOFT_LIMIT) ||
1982 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 1983 sk_enter_memory_pressure(sk);
3ab224be 1984
e1aab161
GC		 1985 /* Over hard limit (we or our parents) */
1986 if ((parent_status == OVER_LIMIT) ||
1987 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 1988 goto suppress_allocation;
1989
1990 /* guarantee minimum buffer size under pressure */
1991 if (kind == SK_MEM_RECV) {
1992 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1993 return 1;
180d8cd9 1994
3ab224be
HA		 1995 } else { /* SK_MEM_SEND */
1996 if (sk->sk_type == SOCK_STREAM) {
1997 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1998 return 1;
1999 } else if (atomic_read(&sk->sk_wmem_alloc) <
2000 prot->sysctl_wmem[0])
2001 return 1;
2002 }
2003
180d8cd9 2004 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2005 int alloc;
2006
180d8cd9 2007 if (!sk_under_memory_pressure(sk))
1748376b 2008 return 1;
180d8cd9
GC		 2009 alloc = sk_sockets_allocated_read_positive(sk);
2010 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2011 sk_mem_pages(sk->sk_wmem_queued +
2012 atomic_read(&sk->sk_rmem_alloc) +
2013 sk->sk_forward_alloc))
2014 return 1;
2015 }
2016
2017suppress_allocation:
2018
2019 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2020 sk_stream_moderate_sndbuf(sk);
2021
2022 /* Fail only if socket is _under_ its sndbuf.
2023 * In this case we cannot block, so that we have to fail.
2024 */
2025 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2026 return 1;
2027 }
2028
3847ce32
SM		 2029 trace_sock_exceed_buf_limit(sk, prot, allocated);
2030
3ab224be
HA		 2031 /* Alas. Undo changes. */
2032 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2033
0e90b31f 2034 sk_memory_allocated_sub(sk, amt);
180d8cd9 2035
3ab224be
HA		 2036 return 0;
2037}
3ab224be
HA		 2038EXPORT_SYMBOL(__sk_mem_schedule);
2039
2040/**
2041 * __sk_reclaim - reclaim memory_allocated
2042 * @sk: socket
2043 */
2044void __sk_mem_reclaim(struct sock *sk)
2045{
180d8cd9 2046 sk_memory_allocated_sub(sk,
0e90b31f 2047 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 2048 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2049
180d8cd9
GC		 2050 if (sk_under_memory_pressure(sk) &&
2051 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2052 sk_leave_memory_pressure(sk);
3ab224be 2053}
3ab224be
HA		 2054EXPORT_SYMBOL(__sk_mem_reclaim);
2055
2056
1da177e4
LT		 2057/*
2058 * Set of default routines for initialising struct proto_ops when
2059 * the protocol does not support a particular function. In certain
2060 * cases where it makes no sense for a protocol to have a "do nothing"
2061 * function, some default processing is provided.
2062 */
2063
2064int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2065{
2066 return -EOPNOTSUPP;
2067}
2a91525c 2068EXPORT_SYMBOL(sock_no_bind);
1da177e4 2069
4ec93edb 2070int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2071 int len, int flags)
2072{
2073 return -EOPNOTSUPP;
2074}
2a91525c 2075EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2076
2077int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2078{
2079 return -EOPNOTSUPP;
2080}
2a91525c 2081EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2082
2083int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2084{
2085 return -EOPNOTSUPP;
2086}
2a91525c 2087EXPORT_SYMBOL(sock_no_accept);
1da177e4 2088
4ec93edb 2089int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2090 int *len, int peer)
2091{
2092 return -EOPNOTSUPP;
2093}
2a91525c 2094EXPORT_SYMBOL(sock_no_getname);
1da177e4 2095
2a91525c 2096unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2097{
2098 return 0;
2099}
2a91525c 2100EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2101
2102int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2103{
2104 return -EOPNOTSUPP;
2105}
2a91525c 2106EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2107
2108int sock_no_listen(struct socket *sock, int backlog)
2109{
2110 return -EOPNOTSUPP;
2111}
2a91525c 2112EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2113
2114int sock_no_shutdown(struct socket *sock, int how)
2115{
2116 return -EOPNOTSUPP;
2117}
2a91525c 2118EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2119
2120int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2121 char __user *optval, unsigned int optlen)
1da177e4
LT		 2122{
2123 return -EOPNOTSUPP;
2124}
2a91525c 2125EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2126
2127int sock_no_getsockopt(struct socket *sock, int level, int optname,
2128 char __user *optval, int __user *optlen)
2129{
2130 return -EOPNOTSUPP;
2131}
2a91525c 2132EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 2133
2134int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2135 size_t len)
2136{
2137 return -EOPNOTSUPP;
2138}
2a91525c 2139EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 2140
2141int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2142 size_t len, int flags)
2143{
2144 return -EOPNOTSUPP;
2145}
2a91525c 2146EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2147
2148int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2149{
2150 /* Mirror missing mmap method error code */
2151 return -ENODEV;
2152}
2a91525c 2153EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2154
2155ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2156{
2157 ssize_t res;
2158 struct msghdr msg = {.msg_flags = flags};
2159 struct kvec iov;
2160 char *kaddr = kmap(page);
2161 iov.iov_base = kaddr + offset;
2162 iov.iov_len = size;
2163 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2164 kunmap(page);
2165 return res;
2166}
2a91525c 2167EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2168
2169/*
2170 * Default Socket Callbacks
2171 */
2172
2173static void sock_def_wakeup(struct sock *sk)
2174{
43815482
ED		 2175 struct socket_wq *wq;
2176
2177 rcu_read_lock();
2178 wq = rcu_dereference(sk->sk_wq);
2179 if (wq_has_sleeper(wq))
2180 wake_up_interruptible_all(&wq->wait);
2181 rcu_read_unlock();
1da177e4
LT		 2182}
2183
2184static void sock_def_error_report(struct sock *sk)
2185{
43815482
ED		 2186 struct socket_wq *wq;
2187
2188 rcu_read_lock();
2189 wq = rcu_dereference(sk->sk_wq);
2190 if (wq_has_sleeper(wq))
2191 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2192 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2193 rcu_read_unlock();
1da177e4
LT		 2194}
2195
676d2369 2196static void sock_def_readable(struct sock *sk)
1da177e4 2197{
43815482
ED		 2198 struct socket_wq *wq;
2199
2200 rcu_read_lock();
2201 wq = rcu_dereference(sk->sk_wq);
2202 if (wq_has_sleeper(wq))
2c6607c6 2203 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2204 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2205 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2206 rcu_read_unlock();
1da177e4
LT		 2207}
2208
2209static void sock_def_write_space(struct sock *sk)
2210{
43815482
ED		 2211 struct socket_wq *wq;
2212
2213 rcu_read_lock();
1da177e4
LT		 2214
2215 /* Do not wake up a writer until he can make "significant"
2216 * progress. --DaveM
2217 */
e71a4783 2218 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2219 wq = rcu_dereference(sk->sk_wq);
2220 if (wq_has_sleeper(wq))
2221 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2222 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2223
2224 /* Should agree with poll, otherwise some programs break */
2225 if (sock_writeable(sk))
8d8ad9d7 2226 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2227 }
2228
43815482 2229 rcu_read_unlock();
1da177e4
LT		 2230}
2231
2232static void sock_def_destruct(struct sock *sk)
2233{
a51482bd 2234 kfree(sk->sk_protinfo);
1da177e4
LT		 2235}
2236
2237void sk_send_sigurg(struct sock *sk)
2238{
2239 if (sk->sk_socket && sk->sk_socket->file)
2240 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2241 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2242}
2a91525c 2243EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2244
2245void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2246 unsigned long expires)
2247{
2248 if (!mod_timer(timer, expires))
2249 sock_hold(sk);
2250}
1da177e4
LT		 2251EXPORT_SYMBOL(sk_reset_timer);
2252
2253void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2254{
25cc4ae9 2255 if (del_timer(timer))
1da177e4
LT		 2256 __sock_put(sk);
2257}
1da177e4
LT		 2258EXPORT_SYMBOL(sk_stop_timer);
2259
2260void sock_init_data(struct socket *sock, struct sock *sk)
2261{
2262 skb_queue_head_init(&sk->sk_receive_queue);
2263 skb_queue_head_init(&sk->sk_write_queue);
2264 skb_queue_head_init(&sk->sk_error_queue);
2265
2266 sk->sk_send_head = NULL;
2267
2268 init_timer(&sk->sk_timer);
4ec93edb 2269
1da177e4
LT		 2270 sk->sk_allocation = GFP_KERNEL;
2271 sk->sk_rcvbuf = sysctl_rmem_default;
2272 sk->sk_sndbuf = sysctl_wmem_default;
2273 sk->sk_state = TCP_CLOSE;
972692e0 2274 sk_set_socket(sk, sock);
1da177e4
LT		 2275
2276 sock_set_flag(sk, SOCK_ZAPPED);
2277
e71a4783 2278 if (sock) {
1da177e4 2279 sk->sk_type = sock->type;
43815482 2280 sk->sk_wq = sock->wq;
1da177e4
LT		 2281 sock->sk = sk;
2282 } else
43815482 2283 sk->sk_wq = NULL;
1da177e4 2284
b6c6712a 2285 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2286 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2287 lockdep_set_class_and_name(&sk->sk_callback_lock,
2288 af_callback_keys + sk->sk_family,
2289 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2290
2291 sk->sk_state_change = sock_def_wakeup;
2292 sk->sk_data_ready = sock_def_readable;
2293 sk->sk_write_space = sock_def_write_space;
2294 sk->sk_error_report = sock_def_error_report;
2295 sk->sk_destruct = sock_def_destruct;
2296
5640f768
ED		 2297 sk->sk_frag.page = NULL;
2298 sk->sk_frag.offset = 0;
ef64a54f 2299 sk->sk_peek_off = -1;
1da177e4 2300
109f6e39
EB		 2301 sk->sk_peer_pid = NULL;
2302 sk->sk_peer_cred = NULL;
1da177e4
LT		 2303 sk->sk_write_pending = 0;
2304 sk->sk_rcvlowat = 1;
2305 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2306 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2307
f37f0afb 2308 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2309
e0d1095a 2310#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2311 sk->sk_napi_id = 0;
64b0dc51 2312 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2313#endif
2314
62748f32 2315 sk->sk_max_pacing_rate = ~0U;
7eec4174 2316 sk->sk_pacing_rate = ~0U;
4dc6dc71
ED		 2317 /*
2318 * Before updating sk_refcnt, we must commit prior changes to memory
2319 * (Documentation/RCU/rculist_nulls.txt for details)
2320 */
2321 smp_wmb();
1da177e4 2322 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2323 atomic_set(&sk->sk_drops, 0);
1da177e4 2324}
2a91525c 2325EXPORT_SYMBOL(sock_init_data);
1da177e4 2326
b5606c2d 2327void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2328{
2329 might_sleep();
a5b5bb9a 2330 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2331 if (sk->sk_lock.owned)
1da177e4 2332 __lock_sock(sk);
d2e9117c 2333 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2334 spin_unlock(&sk->sk_lock.slock);
2335 /*
2336 * The sk_lock has mutex_lock() semantics here:
2337 */
fcc70d5f 2338 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2339 local_bh_enable();
1da177e4 2340}
fcc70d5f 2341EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2342
b5606c2d 2343void release_sock(struct sock *sk)
1da177e4 2344{
a5b5bb9a
IM		 2345 /*
2346 * The sk_lock has mutex_unlock() semantics:
2347 */
2348 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2349
2350 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2351 if (sk->sk_backlog.tail)
2352 __release_sock(sk);
46d3ceab 2353
c3f9b018
ED		 2354 /* Warning : release_cb() might need to release sk ownership,
2355 * ie call sock_release_ownership(sk) before us.
2356 */
46d3ceab
ED		 2357 if (sk->sk_prot->release_cb)
2358 sk->sk_prot->release_cb(sk);
2359
c3f9b018 2360 sock_release_ownership(sk);
a5b5bb9a
IM		 2361 if (waitqueue_active(&sk->sk_lock.wq))
2362 wake_up(&sk->sk_lock.wq);
2363 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2364}
2365EXPORT_SYMBOL(release_sock);
2366
8a74ad60
ED		 2367/**
2368 * lock_sock_fast - fast version of lock_sock
2369 * @sk: socket
2370 *
2371 * This version should be used for very small section, where process wont block
2372 * return false if fast path is taken
2373 * sk_lock.slock locked, owned = 0, BH disabled
2374 * return true if slow path is taken
2375 * sk_lock.slock unlocked, owned = 1, BH enabled
2376 */
2377bool lock_sock_fast(struct sock *sk)
2378{
2379 might_sleep();
2380 spin_lock_bh(&sk->sk_lock.slock);
2381
2382 if (!sk->sk_lock.owned)
2383 /*
2384 * Note : We must disable BH
2385 */
2386 return false;
2387
2388 __lock_sock(sk);
2389 sk->sk_lock.owned = 1;
2390 spin_unlock(&sk->sk_lock.slock);
2391 /*
2392 * The sk_lock has mutex_lock() semantics here:
2393 */
2394 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2395 local_bh_enable();
2396 return true;
2397}
2398EXPORT_SYMBOL(lock_sock_fast);
2399
1da177e4 2400int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2401{
b7aa0bf7 2402 struct timeval tv;
1da177e4 2403 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2404 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2405 tv = ktime_to_timeval(sk->sk_stamp);
2406 if (tv.tv_sec == -1)
1da177e4 2407 return -ENOENT;
b7aa0bf7
ED		 2408 if (tv.tv_sec == 0) {
2409 sk->sk_stamp = ktime_get_real();
2410 tv = ktime_to_timeval(sk->sk_stamp);
2411 }
2412 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2413}
1da177e4
LT		 2414EXPORT_SYMBOL(sock_get_timestamp);
2415
ae40eb1e
ED		 2416int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2417{
2418 struct timespec ts;
2419 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2420 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2421 ts = ktime_to_timespec(sk->sk_stamp);
2422 if (ts.tv_sec == -1)
2423 return -ENOENT;
2424 if (ts.tv_sec == 0) {
2425 sk->sk_stamp = ktime_get_real();
2426 ts = ktime_to_timespec(sk->sk_stamp);
2427 }
2428 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2429}
2430EXPORT_SYMBOL(sock_get_timestampns);
2431
20d49473 2432void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2433{
20d49473 2434 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2435 unsigned long previous_flags = sk->sk_flags;
2436
20d49473
PO		 2437 sock_set_flag(sk, flag);
2438 /*
2439 * we just set one of the two flags which require net
2440 * time stamping, but time stamping might have been on
2441 * already because of the other one
2442 */
08e29af3 2443 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2444 net_enable_timestamp();
1da177e4
LT		 2445 }
2446}
1da177e4 2447
cb820f8e
RC		 2448int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2449 int level, int type)
2450{
2451 struct sock_exterr_skb *serr;
364a9e93 2452 struct sk_buff *skb;
cb820f8e
RC		 2453 int copied, err;
2454
2455 err = -EAGAIN;
364a9e93 2456 skb = sock_dequeue_err_skb(sk);
cb820f8e
RC		 2457 if (skb == NULL)
2458 goto out;
2459
2460 copied = skb->len;
2461 if (copied > len) {
2462 msg->msg_flags |= MSG_TRUNC;
2463 copied = len;
2464 }
51f3d02b 2465 err = skb_copy_datagram_msg(skb, 0, msg, copied);
cb820f8e
RC		 2466 if (err)
2467 goto out_free_skb;
2468
2469 sock_recv_timestamp(msg, sk, skb);
2470
2471 serr = SKB_EXT_ERR(skb);
2472 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2473
2474 msg->msg_flags |= MSG_ERRQUEUE;
2475 err = copied;
2476
cb820f8e
RC		 2477out_free_skb:
2478 kfree_skb(skb);
2479out:
2480 return err;
2481}
2482EXPORT_SYMBOL(sock_recv_errqueue);
2483
1da177e4
LT		 2484/*
2485 * Get a socket option on an socket.
2486 *
2487 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2488 * asynchronous errors should be reported by getsockopt. We assume
2489 * this means if you specify SO_ERROR (otherwise whats the point of it).
2490 */
2491int sock_common_getsockopt(struct socket *sock, int level, int optname,
2492 char __user *optval, int __user *optlen)
2493{
2494 struct sock *sk = sock->sk;
2495
2496 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2497}
1da177e4
LT		 2498EXPORT_SYMBOL(sock_common_getsockopt);
2499
3fdadf7d 2500#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2501int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2502 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2503{
2504 struct sock *sk = sock->sk;
2505
1e51f951 2506 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2507 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2508 optval, optlen);
3fdadf7d
DM		 2509 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2510}
2511EXPORT_SYMBOL(compat_sock_common_getsockopt);
2512#endif
2513
1da177e4
LT		 2514int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2515 struct msghdr *msg, size_t size, int flags)
2516{
2517 struct sock *sk = sock->sk;
2518 int addr_len = 0;
2519 int err;
2520
2521 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2522 flags & ~MSG_DONTWAIT, &addr_len);
2523 if (err >= 0)
2524 msg->msg_namelen = addr_len;
2525 return err;
2526}
1da177e4
LT		 2527EXPORT_SYMBOL(sock_common_recvmsg);
2528
2529/*
2530 * Set socket options on an inet socket.
2531 */
2532int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2533 char __user *optval, unsigned int optlen)
1da177e4
LT		 2534{
2535 struct sock *sk = sock->sk;
2536
2537 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2538}
1da177e4
LT		 2539EXPORT_SYMBOL(sock_common_setsockopt);
2540
3fdadf7d 2541#ifdef CONFIG_COMPAT
543d9cfe 2542int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2543 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2544{
2545 struct sock *sk = sock->sk;
2546
543d9cfe
ACM		 2547 if (sk->sk_prot->compat_setsockopt != NULL)
2548 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2549 optval, optlen);
3fdadf7d
DM		 2550 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2551}
2552EXPORT_SYMBOL(compat_sock_common_setsockopt);
2553#endif
2554
1da177e4
LT		 2555void sk_common_release(struct sock *sk)
2556{
2557 if (sk->sk_prot->destroy)
2558 sk->sk_prot->destroy(sk);
2559
2560 /*
2561 * Observation: when sock_common_release is called, processes have
2562 * no access to socket. But net still has.
2563 * Step one, detach it from networking:
2564 *
2565 * A. Remove from hash tables.
2566 */
2567
2568 sk->sk_prot->unhash(sk);
2569
2570 /*
2571 * In this point socket cannot receive new packets, but it is possible
2572 * that some packets are in flight because some CPU runs receiver and
2573 * did hash table lookup before we unhashed socket. They will achieve
2574 * receive queue and will be purged by socket destructor.
2575 *
2576 * Also we still have packets pending on receive queue and probably,
2577 * our own packets waiting in device queues. sock_destroy will drain
2578 * receive queue, but transmitted packets will delay socket destruction
2579 * until the last reference will be released.
2580 */
2581
2582 sock_orphan(sk);
2583
2584 xfrm_sk_free_policy(sk);
2585
e6848976 2586 sk_refcnt_debug_release(sk);
5640f768
ED		 2587
2588 if (sk->sk_frag.page) {
2589 put_page(sk->sk_frag.page);
2590 sk->sk_frag.page = NULL;
2591 }
2592
1da177e4
LT		 2593 sock_put(sk);
2594}
1da177e4
LT		 2595EXPORT_SYMBOL(sk_common_release);
2596
13ff3d6f
PE		 2597#ifdef CONFIG_PROC_FS
2598#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2599struct prot_inuse {
2600 int val[PROTO_INUSE_NR];
2601};
13ff3d6f
PE		 2602
2603static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2604
2605#ifdef CONFIG_NET_NS
2606void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2607{
d6d9ca0f 2608 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2609}
2610EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2611
2612int sock_prot_inuse_get(struct net *net, struct proto *prot)
2613{
2614 int cpu, idx = prot->inuse_idx;
2615 int res = 0;
2616
2617 for_each_possible_cpu(cpu)
2618 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2619
2620 return res >= 0 ? res : 0;
2621}
2622EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2623
2c8c1e72 2624static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2625{
2626 net->core.inuse = alloc_percpu(struct prot_inuse);
2627 return net->core.inuse ? 0 : -ENOMEM;
2628}
2629
2c8c1e72 2630static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2631{
2632 free_percpu(net->core.inuse);
2633}
2634
2635static struct pernet_operations net_inuse_ops = {
2636 .init = sock_inuse_init_net,
2637 .exit = sock_inuse_exit_net,
2638};
2639
2640static __init int net_inuse_init(void)
2641{
2642 if (register_pernet_subsys(&net_inuse_ops))
2643 panic("Cannot initialize net inuse counters");
2644
2645 return 0;
2646}
2647
2648core_initcall(net_inuse_init);
2649#else
1338d466
PE		 2650static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2651
c29a0bc4 2652void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2653{
d6d9ca0f 2654 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2655}
2656EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2657
c29a0bc4 2658int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2659{
2660 int cpu, idx = prot->inuse_idx;
2661 int res = 0;
2662
2663 for_each_possible_cpu(cpu)
2664 res += per_cpu(prot_inuse, cpu).val[idx];
2665
2666 return res >= 0 ? res : 0;
2667}
2668EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2669#endif
13ff3d6f
PE		 2670
2671static void assign_proto_idx(struct proto *prot)
2672{
2673 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2674
2675 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2676 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2677 return;
2678 }
2679
2680 set_bit(prot->inuse_idx, proto_inuse_idx);
2681}
2682
2683static void release_proto_idx(struct proto *prot)
2684{
2685 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2686 clear_bit(prot->inuse_idx, proto_inuse_idx);
2687}
2688#else
2689static inline void assign_proto_idx(struct proto *prot)
2690{
2691}
2692
2693static inline void release_proto_idx(struct proto *prot)
2694{
2695}
2696#endif
2697
b733c007
PE		 2698int proto_register(struct proto *prot, int alloc_slab)
2699{
1da177e4
LT		 2700 if (alloc_slab) {
2701 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2702 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2703 NULL);
1da177e4
LT		 2704
2705 if (prot->slab == NULL) {
e005d193
JP		 2706 pr_crit("%s: Can't create sock SLAB cache!\n",
2707 prot->name);
60e7663d 2708 goto out;
1da177e4 2709 }
2e6599cb
ACM		 2710
2711 if (prot->rsk_prot != NULL) {
faf23422 2712 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2713 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2714 goto out_free_sock_slab;
2715
7e56b5d6 2716 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2717 prot->rsk_prot->obj_size, 0,
20c2df83 2718 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2719
2720 if (prot->rsk_prot->slab == NULL) {
e005d193
JP		 2721 pr_crit("%s: Can't create request sock SLAB cache!\n",
2722 prot->name);
2e6599cb
ACM		 2723 goto out_free_request_sock_slab_name;
2724 }
2725 }
8feaf0c0 2726
6d6ee43e 2727 if (prot->twsk_prot != NULL) {
faf23422 2728 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2729
7e56b5d6 2730 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2731 goto out_free_request_sock_slab;
2732
6d6ee43e 2733 prot->twsk_prot->twsk_slab =
7e56b5d6 2734 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2735 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2736 0,
2737 SLAB_HWCACHE_ALIGN |
2738 prot->slab_flags,
20c2df83 2739 NULL);
6d6ee43e 2740 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2741 goto out_free_timewait_sock_slab_name;
2742 }
1da177e4
LT		 2743 }
2744
36b77a52 2745 mutex_lock(&proto_list_mutex);
1da177e4 2746 list_add(&prot->node, &proto_list);
13ff3d6f 2747 assign_proto_idx(prot);
36b77a52 2748 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2749 return 0;
2750
8feaf0c0 2751out_free_timewait_sock_slab_name:
7e56b5d6 2752 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2753out_free_request_sock_slab:
2754 if (prot->rsk_prot && prot->rsk_prot->slab) {
2755 kmem_cache_destroy(prot->rsk_prot->slab);
2756 prot->rsk_prot->slab = NULL;
2757 }
2e6599cb 2758out_free_request_sock_slab_name:
72150e9b
DC		 2759 if (prot->rsk_prot)
2760 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2761out_free_sock_slab:
2762 kmem_cache_destroy(prot->slab);
2763 prot->slab = NULL;
b733c007
PE		 2764out:
2765 return -ENOBUFS;
1da177e4 2766}
1da177e4
LT		 2767EXPORT_SYMBOL(proto_register);
2768
2769void proto_unregister(struct proto *prot)
2770{
36b77a52 2771 mutex_lock(&proto_list_mutex);
13ff3d6f 2772 release_proto_idx(prot);
0a3f4358 2773 list_del(&prot->node);
36b77a52 2774 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2775
2776 if (prot->slab != NULL) {
2777 kmem_cache_destroy(prot->slab);
2778 prot->slab = NULL;
2779 }
2780
2e6599cb 2781 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2782 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2783 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2784 prot->rsk_prot->slab = NULL;
2785 }
2786
6d6ee43e 2787 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2788 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2789 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2790 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2791 }
1da177e4 2792}
1da177e4
LT		 2793EXPORT_SYMBOL(proto_unregister);
2794
2795#ifdef CONFIG_PROC_FS
1da177e4 2796static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2797 __acquires(proto_list_mutex)
1da177e4 2798{
36b77a52 2799 mutex_lock(&proto_list_mutex);
60f0438a 2800 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2801}
2802
2803static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2804{
60f0438a 2805 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2806}
2807
2808static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2809 __releases(proto_list_mutex)
1da177e4 2810{
36b77a52 2811 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2812}
2813
2814static char proto_method_implemented(const void *method)
2815{
2816 return method == NULL ? 'n' : 'y';
2817}
180d8cd9
GC		 2818static long sock_prot_memory_allocated(struct proto *proto)
2819{
cb75a36c 2820 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2821}
2822
2823static char *sock_prot_memory_pressure(struct proto *proto)
2824{
2825 return proto->memory_pressure != NULL ?
2826 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2827}
1da177e4
LT		 2828
2829static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2830{
180d8cd9 2831
8d987e5c 2832 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2833 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2834 proto->name,
2835 proto->obj_size,
14e943db 2836 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2837 sock_prot_memory_allocated(proto),
2838 sock_prot_memory_pressure(proto),
1da177e4
LT		 2839 proto->max_header,
2840 proto->slab == NULL ? "no" : "yes",
2841 module_name(proto->owner),
2842 proto_method_implemented(proto->close),
2843 proto_method_implemented(proto->connect),
2844 proto_method_implemented(proto->disconnect),
2845 proto_method_implemented(proto->accept),
2846 proto_method_implemented(proto->ioctl),
2847 proto_method_implemented(proto->init),
2848 proto_method_implemented(proto->destroy),
2849 proto_method_implemented(proto->shutdown),
2850 proto_method_implemented(proto->setsockopt),
2851 proto_method_implemented(proto->getsockopt),
2852 proto_method_implemented(proto->sendmsg),
2853 proto_method_implemented(proto->recvmsg),
2854 proto_method_implemented(proto->sendpage),
2855 proto_method_implemented(proto->bind),
2856 proto_method_implemented(proto->backlog_rcv),
2857 proto_method_implemented(proto->hash),
2858 proto_method_implemented(proto->unhash),
2859 proto_method_implemented(proto->get_port),
2860 proto_method_implemented(proto->enter_memory_pressure));
2861}
2862
2863static int proto_seq_show(struct seq_file *seq, void *v)
2864{
60f0438a 2865 if (v == &proto_list)
1da177e4
LT		 2866 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2867 "protocol",
2868 "size",
2869 "sockets",
2870 "memory",
2871 "press",
2872 "maxhdr",
2873 "slab",
2874 "module",
2875 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2876 else
60f0438a 2877 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2878 return 0;
2879}
2880
f690808e 2881static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2882 .start = proto_seq_start,
2883 .next = proto_seq_next,
2884 .stop = proto_seq_stop,
2885 .show = proto_seq_show,
2886};
2887
2888static int proto_seq_open(struct inode *inode, struct file *file)
2889{
14e943db
ED		 2890 return seq_open_net(inode, file, &proto_seq_ops,
2891 sizeof(struct seq_net_private));
1da177e4
LT		 2892}
2893
9a32144e 2894static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2895 .owner = THIS_MODULE,
2896 .open = proto_seq_open,
2897 .read = seq_read,
2898 .llseek = seq_lseek,
14e943db
ED		 2899 .release = seq_release_net,
2900};
2901
2902static __net_init int proto_init_net(struct net *net)
2903{
d4beaa66 2904 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 2905 return -ENOMEM;
2906
2907 return 0;
2908}
2909
2910static __net_exit void proto_exit_net(struct net *net)
2911{
ece31ffd 2912 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 2913}
2914
2915
2916static __net_initdata struct pernet_operations proto_net_ops = {
2917 .init = proto_init_net,
2918 .exit = proto_exit_net,
1da177e4
LT		 2919};
2920
2921static int __init proto_init(void)
2922{
14e943db 2923 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2924}
2925
2926subsys_initcall(proto_init);
2927
2928#endif /* PROC_FS */
Linux kernel - Deliverables
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