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bnx2x: Fix link problems for 1G SFP RJ45 module
[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
169 * @cap: The global capbility to use
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 *
186 * Test to see if the opener of the socket had when the socke was created
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;
f0088a50 440 int skb_len;
3b885787
NH		 441 unsigned long flags;
442 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 443
0fd7bac6 444 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
766e9037 445 atomic_inc(&sk->sk_drops);
3847ce32 446 trace_sock_rcvqueue_full(sk, skb);
766e9037 447 return -ENOMEM;
f0088a50
DV		 448 }
449
fda9ef5d 450 err = sk_filter(sk, skb);
f0088a50 451 if (err)
766e9037 452 return err;
f0088a50 453
c76562b6 454 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
766e9037
ED		 455 atomic_inc(&sk->sk_drops);
456 return -ENOBUFS;
3ab224be
HA		 457 }
458
f0088a50
DV		 459 skb->dev = NULL;
460 skb_set_owner_r(skb, sk);
49ad9599 461
f0088a50
DV		 462 /* Cache the SKB length before we tack it onto the receive
463 * queue. Once it is added it no longer belongs to us and
464 * may be freed by other threads of control pulling packets
465 * from the queue.
466 */
467 skb_len = skb->len;
468
7fee226a
ED		 469 /* we escape from rcu protected region, make sure we dont leak
470 * a norefcounted dst
471 */
472 skb_dst_force(skb);
473
3b885787
NH		 474 spin_lock_irqsave(&list->lock, flags);
475 skb->dropcount = atomic_read(&sk->sk_drops);
476 __skb_queue_tail(list, skb);
477 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 478
479 if (!sock_flag(sk, SOCK_DEAD))
676d2369 480 sk->sk_data_ready(sk);
766e9037 481 return 0;
f0088a50
DV		 482}
483EXPORT_SYMBOL(sock_queue_rcv_skb);
484
58a5a7b9 485int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 486{
487 int rc = NET_RX_SUCCESS;
488
fda9ef5d 489 if (sk_filter(sk, skb))
f0088a50
DV		 490 goto discard_and_relse;
491
492 skb->dev = NULL;
493
274f482d 494 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
c377411f
ED		 495 atomic_inc(&sk->sk_drops);
496 goto discard_and_relse;
497 }
58a5a7b9
ACM		 498 if (nested)
499 bh_lock_sock_nested(sk);
500 else
501 bh_lock_sock(sk);
a5b5bb9a
IM		 502 if (!sock_owned_by_user(sk)) {
503 /*
504 * trylock + unlock semantics:
505 */
506 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
507
c57943a1 508 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 509
510 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
f545a38f 511 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
8eae939f
ZY		 512 bh_unlock_sock(sk);
513 atomic_inc(&sk->sk_drops);
514 goto discard_and_relse;
515 }
516
f0088a50
DV		 517 bh_unlock_sock(sk);
518out:
519 sock_put(sk);
520 return rc;
521discard_and_relse:
522 kfree_skb(skb);
523 goto out;
524}
525EXPORT_SYMBOL(sk_receive_skb);
526
527struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
528{
b6c6712a 529 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 530
531 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 532 sk_tx_queue_clear(sk);
a9b3cd7f 533 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
f0088a50
DV		 534 dst_release(dst);
535 return NULL;
536 }
537
538 return dst;
539}
540EXPORT_SYMBOL(__sk_dst_check);
541
542struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
543{
544 struct dst_entry *dst = sk_dst_get(sk);
545
546 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
547 sk_dst_reset(sk);
548 dst_release(dst);
549 return NULL;
550 }
551
552 return dst;
553}
554EXPORT_SYMBOL(sk_dst_check);
555
c91f6df2
BH		 556static int sock_setbindtodevice(struct sock *sk, char __user *optval,
557 int optlen)
4878809f
DM		 558{
559 int ret = -ENOPROTOOPT;
560#ifdef CONFIG_NETDEVICES
3b1e0a65 561 struct net *net = sock_net(sk);
4878809f
DM		 562 char devname[IFNAMSIZ];
563 int index;
564
565 /* Sorry... */
566 ret = -EPERM;
5e1fccc0 567 if (!ns_capable(net->user_ns, CAP_NET_RAW))
4878809f
DM		 568 goto out;
569
570 ret = -EINVAL;
571 if (optlen < 0)
572 goto out;
573
574 /* Bind this socket to a particular device like "eth0",
575 * as specified in the passed interface name. If the
576 * name is "" or the option length is zero the socket
577 * is not bound.
578 */
579 if (optlen > IFNAMSIZ - 1)
580 optlen = IFNAMSIZ - 1;
581 memset(devname, 0, sizeof(devname));
582
583 ret = -EFAULT;
584 if (copy_from_user(devname, optval, optlen))
585 goto out;
586
000ba2e4
DM		 587 index = 0;
588 if (devname[0] != '\0') {
bf8e56bf 589 struct net_device *dev;
4878809f 590
bf8e56bf
ED		 591 rcu_read_lock();
592 dev = dev_get_by_name_rcu(net, devname);
593 if (dev)
594 index = dev->ifindex;
595 rcu_read_unlock();
4878809f
DM		 596 ret = -ENODEV;
597 if (!dev)
598 goto out;
4878809f
DM		 599 }
600
601 lock_sock(sk);
602 sk->sk_bound_dev_if = index;
603 sk_dst_reset(sk);
604 release_sock(sk);
605
606 ret = 0;
607
608out:
609#endif
610
611 return ret;
612}
613
c91f6df2
BH		 614static int sock_getbindtodevice(struct sock *sk, char __user *optval,
615 int __user *optlen, int len)
616{
617 int ret = -ENOPROTOOPT;
618#ifdef CONFIG_NETDEVICES
619 struct net *net = sock_net(sk);
c91f6df2 620 char devname[IFNAMSIZ];
c91f6df2
BH		 621
622 if (sk->sk_bound_dev_if == 0) {
623 len = 0;
624 goto zero;
625 }
626
627 ret = -EINVAL;
628 if (len < IFNAMSIZ)
629 goto out;
630
5dbe7c17
NS		 631 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
632 if (ret)
c91f6df2 633 goto out;
c91f6df2
BH		 634
635 len = strlen(devname) + 1;
636
637 ret = -EFAULT;
638 if (copy_to_user(optval, devname, len))
639 goto out;
640
641zero:
642 ret = -EFAULT;
643 if (put_user(len, optlen))
644 goto out;
645
646 ret = 0;
647
648out:
649#endif
650
651 return ret;
652}
653
c0ef877b
PE		 654static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
655{
656 if (valbool)
657 sock_set_flag(sk, bit);
658 else
659 sock_reset_flag(sk, bit);
660}
661
1da177e4
LT		 662/*
663 * This is meant for all protocols to use and covers goings on
664 * at the socket level. Everything here is generic.
665 */
666
667int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 668 char __user *optval, unsigned int optlen)
1da177e4 669{
2a91525c 670 struct sock *sk = sock->sk;
1da177e4
LT		 671 int val;
672 int valbool;
673 struct linger ling;
674 int ret = 0;
4ec93edb 675
1da177e4
LT		 676 /*
677 * Options without arguments
678 */
679
4878809f 680 if (optname == SO_BINDTODEVICE)
c91f6df2 681 return sock_setbindtodevice(sk, optval, optlen);
4878809f 682
e71a4783
SH		 683 if (optlen < sizeof(int))
684 return -EINVAL;
4ec93edb 685
1da177e4
LT		 686 if (get_user(val, (int __user *)optval))
687 return -EFAULT;
4ec93edb 688
2a91525c 689 valbool = val ? 1 : 0;
1da177e4
LT		 690
691 lock_sock(sk);
692
2a91525c 693 switch (optname) {
e71a4783 694 case SO_DEBUG:
2a91525c 695 if (val && !capable(CAP_NET_ADMIN))
e71a4783 696 ret = -EACCES;
2a91525c 697 else
c0ef877b 698 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 699 break;
700 case SO_REUSEADDR:
4a17fd52 701 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
e71a4783 702 break;
055dc21a
TH		 703 case SO_REUSEPORT:
704 sk->sk_reuseport = valbool;
705 break;
e71a4783 706 case SO_TYPE:
49c794e9 707 case SO_PROTOCOL:
0d6038ee 708 case SO_DOMAIN:
e71a4783
SH		 709 case SO_ERROR:
710 ret = -ENOPROTOOPT;
711 break;
712 case SO_DONTROUTE:
c0ef877b 713 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 714 break;
715 case SO_BROADCAST:
716 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
717 break;
718 case SO_SNDBUF:
719 /* Don't error on this BSD doesn't and if you think
82981930
ED		 720 * about it this is right. Otherwise apps have to
721 * play 'guess the biggest size' games. RCVBUF/SNDBUF
722 * are treated in BSD as hints
723 */
724 val = min_t(u32, val, sysctl_wmem_max);
b0573dea 725set_sndbuf:
e71a4783 726 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
82981930
ED		 727 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
728 /* Wake up sending tasks if we upped the value. */
e71a4783
SH		 729 sk->sk_write_space(sk);
730 break;
1da177e4 731
e71a4783
SH		 732 case SO_SNDBUFFORCE:
733 if (!capable(CAP_NET_ADMIN)) {
734 ret = -EPERM;
735 break;
736 }
737 goto set_sndbuf;
b0573dea 738
e71a4783
SH		 739 case SO_RCVBUF:
740 /* Don't error on this BSD doesn't and if you think
82981930
ED		 741 * about it this is right. Otherwise apps have to
742 * play 'guess the biggest size' games. RCVBUF/SNDBUF
743 * are treated in BSD as hints
744 */
745 val = min_t(u32, val, sysctl_rmem_max);
b0573dea 746set_rcvbuf:
e71a4783
SH		 747 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
748 /*
749 * We double it on the way in to account for
750 * "struct sk_buff" etc. overhead. Applications
751 * assume that the SO_RCVBUF setting they make will
752 * allow that much actual data to be received on that
753 * socket.
754 *
755 * Applications are unaware that "struct sk_buff" and
756 * other overheads allocate from the receive buffer
757 * during socket buffer allocation.
758 *
759 * And after considering the possible alternatives,
760 * returning the value we actually used in getsockopt
761 * is the most desirable behavior.
762 */
82981930 763 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
e71a4783
SH		 764 break;
765
766 case SO_RCVBUFFORCE:
767 if (!capable(CAP_NET_ADMIN)) {
768 ret = -EPERM;
1da177e4 769 break;
e71a4783
SH		 770 }
771 goto set_rcvbuf;
1da177e4 772
e71a4783 773 case SO_KEEPALIVE:
1da177e4 774#ifdef CONFIG_INET
3e10986d
ED		 775 if (sk->sk_protocol == IPPROTO_TCP &&
776 sk->sk_type == SOCK_STREAM)
e71a4783 777 tcp_set_keepalive(sk, valbool);
1da177e4 778#endif
e71a4783
SH		 779 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
780 break;
781
782 case SO_OOBINLINE:
783 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
784 break;
785
786 case SO_NO_CHECK:
28448b80 787 sk->sk_no_check_tx = valbool;
e71a4783
SH		 788 break;
789
790 case SO_PRIORITY:
5e1fccc0
EB		 791 if ((val >= 0 && val <= 6) ||
792 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
e71a4783
SH		 793 sk->sk_priority = val;
794 else
795 ret = -EPERM;
796 break;
797
798 case SO_LINGER:
799 if (optlen < sizeof(ling)) {
800 ret = -EINVAL; /* 1003.1g */
1da177e4 801 break;
e71a4783 802 }
2a91525c 803 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 804 ret = -EFAULT;
1da177e4 805 break;
e71a4783
SH		 806 }
807 if (!ling.l_onoff)
808 sock_reset_flag(sk, SOCK_LINGER);
809 else {
1da177e4 810#if (BITS_PER_LONG == 32)
e71a4783
SH		 811 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
812 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 813 else
e71a4783
SH		 814#endif
815 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
816 sock_set_flag(sk, SOCK_LINGER);
817 }
818 break;
819
820 case SO_BSDCOMPAT:
821 sock_warn_obsolete_bsdism("setsockopt");
822 break;
823
824 case SO_PASSCRED:
825 if (valbool)
826 set_bit(SOCK_PASSCRED, &sock->flags);
827 else
828 clear_bit(SOCK_PASSCRED, &sock->flags);
829 break;
830
831 case SO_TIMESTAMP:
92f37fd2 832 case SO_TIMESTAMPNS:
e71a4783 833 if (valbool) {
92f37fd2
ED		 834 if (optname == SO_TIMESTAMP)
835 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
836 else
837 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 838 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 839 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 840 } else {
e71a4783 841 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 842 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
843 }
e71a4783
SH		 844 break;
845
20d49473
PO		 846 case SO_TIMESTAMPING:
847 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 848 ret = -EINVAL;
20d49473
PO		 849 break;
850 }
09c2d251 851 if (val & SOF_TIMESTAMPING_OPT_ID &&
4ed2d765
WB		 852 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
853 if (sk->sk_protocol == IPPROTO_TCP) {
854 if (sk->sk_state != TCP_ESTABLISHED) {
855 ret = -EINVAL;
856 break;
857 }
858 sk->sk_tskey = tcp_sk(sk)->snd_una;
859 } else {
860 sk->sk_tskey = 0;
861 }
862 }
b9f40e21 863 sk->sk_tsflags = val;
20d49473
PO		 864 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
865 sock_enable_timestamp(sk,
866 SOCK_TIMESTAMPING_RX_SOFTWARE);
867 else
868 sock_disable_timestamp(sk,
08e29af3 869 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
20d49473
PO		 870 break;
871
e71a4783
SH		 872 case SO_RCVLOWAT:
873 if (val < 0)
874 val = INT_MAX;
875 sk->sk_rcvlowat = val ? : 1;
876 break;
877
878 case SO_RCVTIMEO:
879 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
880 break;
881
882 case SO_SNDTIMEO:
883 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
884 break;
1da177e4 885
e71a4783
SH		 886 case SO_ATTACH_FILTER:
887 ret = -EINVAL;
888 if (optlen == sizeof(struct sock_fprog)) {
889 struct sock_fprog fprog;
1da177e4 890
e71a4783
SH		 891 ret = -EFAULT;
892 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 893 break;
e71a4783
SH		 894
895 ret = sk_attach_filter(&fprog, sk);
896 }
897 break;
898
899 case SO_DETACH_FILTER:
55b33325 900 ret = sk_detach_filter(sk);
e71a4783 901 break;
1da177e4 902
d59577b6
VB		 903 case SO_LOCK_FILTER:
904 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
905 ret = -EPERM;
906 else
907 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
908 break;
909
e71a4783
SH		 910 case SO_PASSSEC:
911 if (valbool)
912 set_bit(SOCK_PASSSEC, &sock->flags);
913 else
914 clear_bit(SOCK_PASSSEC, &sock->flags);
915 break;
4a19ec58 916 case SO_MARK:
5e1fccc0 917 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
4a19ec58 918 ret = -EPERM;
2a91525c 919 else
4a19ec58 920 sk->sk_mark = val;
4a19ec58 921 break;
877ce7c1 922
1da177e4
LT		 923 /* We implement the SO_SNDLOWAT etc to
924 not be settable (1003.1g 5.3) */
3b885787 925 case SO_RXQ_OVFL:
8083f0fc 926 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
3b885787 927 break;
6e3e939f
JB		 928
929 case SO_WIFI_STATUS:
930 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
931 break;
932
ef64a54f
PE		 933 case SO_PEEK_OFF:
934 if (sock->ops->set_peek_off)
12663bfc 935 ret = sock->ops->set_peek_off(sk, val);
ef64a54f
PE		 936 else
937 ret = -EOPNOTSUPP;
938 break;
3bdc0eba
BG		 939
940 case SO_NOFCS:
941 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
942 break;
943
7d4c04fc
KJ		 944 case SO_SELECT_ERR_QUEUE:
945 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
946 break;
947
e0d1095a 948#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 949 case SO_BUSY_POLL:
dafcc438
ET		 950 /* allow unprivileged users to decrease the value */
951 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
952 ret = -EPERM;
953 else {
954 if (val < 0)
955 ret = -EINVAL;
956 else
957 sk->sk_ll_usec = val;
958 }
959 break;
960#endif
62748f32
ED		 961
962 case SO_MAX_PACING_RATE:
963 sk->sk_max_pacing_rate = val;
964 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
965 sk->sk_max_pacing_rate);
966 break;
967
e71a4783
SH		 968 default:
969 ret = -ENOPROTOOPT;
970 break;
4ec93edb 971 }
1da177e4
LT		 972 release_sock(sk);
973 return ret;
974}
2a91525c 975EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 976
977
8f09898b 978static void cred_to_ucred(struct pid *pid, const struct cred *cred,
979 struct ucred *ucred)
3f551f94
EB		 980{
981 ucred->pid = pid_vnr(pid);
982 ucred->uid = ucred->gid = -1;
983 if (cred) {
984 struct user_namespace *current_ns = current_user_ns();
985
b2e4f544
EB		 986 ucred->uid = from_kuid_munged(current_ns, cred->euid);
987 ucred->gid = from_kgid_munged(current_ns, cred->egid);
3f551f94
EB		 988 }
989}
990
1da177e4
LT		 991int sock_getsockopt(struct socket *sock, int level, int optname,
992 char __user *optval, int __user *optlen)
993{
994 struct sock *sk = sock->sk;
4ec93edb 995
e71a4783 996 union {
4ec93edb
YH		 997 int val;
998 struct linger ling;
1da177e4
LT		 999 struct timeval tm;
1000 } v;
4ec93edb 1001
4d0392be 1002 int lv = sizeof(int);
1da177e4 1003 int len;
4ec93edb 1004
e71a4783 1005 if (get_user(len, optlen))
4ec93edb 1006 return -EFAULT;
e71a4783 1007 if (len < 0)
1da177e4 1008 return -EINVAL;
4ec93edb 1009
50fee1de 1010 memset(&v, 0, sizeof(v));
df0bca04 1011
2a91525c 1012 switch (optname) {
e71a4783
SH		 1013 case SO_DEBUG:
1014 v.val = sock_flag(sk, SOCK_DBG);
1015 break;
1016
1017 case SO_DONTROUTE:
1018 v.val = sock_flag(sk, SOCK_LOCALROUTE);
1019 break;
1020
1021 case SO_BROADCAST:
1b23a5df 1022 v.val = sock_flag(sk, SOCK_BROADCAST);
e71a4783
SH		 1023 break;
1024
1025 case SO_SNDBUF:
1026 v.val = sk->sk_sndbuf;
1027 break;
1028
1029 case SO_RCVBUF:
1030 v.val = sk->sk_rcvbuf;
1031 break;
1032
1033 case SO_REUSEADDR:
1034 v.val = sk->sk_reuse;
1035 break;
1036
055dc21a
TH		 1037 case SO_REUSEPORT:
1038 v.val = sk->sk_reuseport;
1039 break;
1040
e71a4783 1041 case SO_KEEPALIVE:
1b23a5df 1042 v.val = sock_flag(sk, SOCK_KEEPOPEN);
e71a4783
SH		 1043 break;
1044
1045 case SO_TYPE:
1046 v.val = sk->sk_type;
1047 break;
1048
49c794e9
JE		 1049 case SO_PROTOCOL:
1050 v.val = sk->sk_protocol;
1051 break;
1052
0d6038ee
JE		 1053 case SO_DOMAIN:
1054 v.val = sk->sk_family;
1055 break;
1056
e71a4783
SH		 1057 case SO_ERROR:
1058 v.val = -sock_error(sk);
2a91525c 1059 if (v.val == 0)
e71a4783
SH		 1060 v.val = xchg(&sk->sk_err_soft, 0);
1061 break;
1062
1063 case SO_OOBINLINE:
1b23a5df 1064 v.val = sock_flag(sk, SOCK_URGINLINE);
e71a4783
SH		 1065 break;
1066
1067 case SO_NO_CHECK:
28448b80 1068 v.val = sk->sk_no_check_tx;
e71a4783
SH		 1069 break;
1070
1071 case SO_PRIORITY:
1072 v.val = sk->sk_priority;
1073 break;
1074
1075 case SO_LINGER:
1076 lv = sizeof(v.ling);
1b23a5df 1077 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
e71a4783
SH		 1078 v.ling.l_linger = sk->sk_lingertime / HZ;
1079 break;
1080
1081 case SO_BSDCOMPAT:
1082 sock_warn_obsolete_bsdism("getsockopt");
1083 break;
1084
1085 case SO_TIMESTAMP:
92f37fd2
ED		 1086 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
1087 !sock_flag(sk, SOCK_RCVTSTAMPNS);
1088 break;
1089
1090 case SO_TIMESTAMPNS:
1091 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 1092 break;
1093
20d49473 1094 case SO_TIMESTAMPING:
b9f40e21 1095 v.val = sk->sk_tsflags;
20d49473
PO		 1096 break;
1097
e71a4783 1098 case SO_RCVTIMEO:
2a91525c 1099 lv = sizeof(struct timeval);
e71a4783
SH		 1100 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
1101 v.tm.tv_sec = 0;
1102 v.tm.tv_usec = 0;
1103 } else {
1104 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1105 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1106 }
1107 break;
1108
1109 case SO_SNDTIMEO:
2a91525c 1110 lv = sizeof(struct timeval);
e71a4783
SH		 1111 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1112 v.tm.tv_sec = 0;
1113 v.tm.tv_usec = 0;
1114 } else {
1115 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1116 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1117 }
1118 break;
1da177e4 1119
e71a4783
SH		 1120 case SO_RCVLOWAT:
1121 v.val = sk->sk_rcvlowat;
1122 break;
1da177e4 1123
e71a4783 1124 case SO_SNDLOWAT:
2a91525c 1125 v.val = 1;
e71a4783 1126 break;
1da177e4 1127
e71a4783 1128 case SO_PASSCRED:
82981930 1129 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
e71a4783 1130 break;
1da177e4 1131
e71a4783 1132 case SO_PEERCRED:
109f6e39
EB		 1133 {
1134 struct ucred peercred;
1135 if (len > sizeof(peercred))
1136 len = sizeof(peercred);
1137 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1138 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 1139 return -EFAULT;
1140 goto lenout;
109f6e39 1141 }
1da177e4 1142
e71a4783
SH		 1143 case SO_PEERNAME:
1144 {
1145 char address[128];
1146
1147 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1148 return -ENOTCONN;
1149 if (lv < len)
1150 return -EINVAL;
1151 if (copy_to_user(optval, address, len))
1152 return -EFAULT;
1153 goto lenout;
1154 }
1da177e4 1155
e71a4783
SH		 1156 /* Dubious BSD thing... Probably nobody even uses it, but
1157 * the UNIX standard wants it for whatever reason... -DaveM
1158 */
1159 case SO_ACCEPTCONN:
1160 v.val = sk->sk_state == TCP_LISTEN;
1161 break;
1da177e4 1162
e71a4783 1163 case SO_PASSSEC:
82981930 1164 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
e71a4783 1165 break;
877ce7c1 1166
e71a4783
SH		 1167 case SO_PEERSEC:
1168 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 1169
4a19ec58
LAT		 1170 case SO_MARK:
1171 v.val = sk->sk_mark;
1172 break;
1173
3b885787 1174 case SO_RXQ_OVFL:
1b23a5df 1175 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
3b885787
NH		 1176 break;
1177
6e3e939f 1178 case SO_WIFI_STATUS:
1b23a5df 1179 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
6e3e939f
JB		 1180 break;
1181
ef64a54f
PE		 1182 case SO_PEEK_OFF:
1183 if (!sock->ops->set_peek_off)
1184 return -EOPNOTSUPP;
1185
1186 v.val = sk->sk_peek_off;
1187 break;
bc2f7996 1188 case SO_NOFCS:
1b23a5df 1189 v.val = sock_flag(sk, SOCK_NOFCS);
bc2f7996 1190 break;
c91f6df2 1191
f7b86bfe 1192 case SO_BINDTODEVICE:
c91f6df2
BH		 1193 return sock_getbindtodevice(sk, optval, optlen, len);
1194
a8fc9277
PE		 1195 case SO_GET_FILTER:
1196 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
1197 if (len < 0)
1198 return len;
1199
1200 goto lenout;
c91f6df2 1201
d59577b6
VB		 1202 case SO_LOCK_FILTER:
1203 v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
1204 break;
1205
ea02f941
MS		 1206 case SO_BPF_EXTENSIONS:
1207 v.val = bpf_tell_extensions();
1208 break;
1209
7d4c04fc
KJ		 1210 case SO_SELECT_ERR_QUEUE:
1211 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
1212 break;
1213
e0d1095a 1214#ifdef CONFIG_NET_RX_BUSY_POLL
64b0dc51 1215 case SO_BUSY_POLL:
dafcc438
ET		 1216 v.val = sk->sk_ll_usec;
1217 break;
1218#endif
1219
62748f32
ED		 1220 case SO_MAX_PACING_RATE:
1221 v.val = sk->sk_max_pacing_rate;
1222 break;
1223
e71a4783
SH		 1224 default:
1225 return -ENOPROTOOPT;
1da177e4 1226 }
e71a4783 1227
1da177e4
LT		 1228 if (len > lv)
1229 len = lv;
1230 if (copy_to_user(optval, &v, len))
1231 return -EFAULT;
1232lenout:
4ec93edb
YH		 1233 if (put_user(len, optlen))
1234 return -EFAULT;
1235 return 0;
1da177e4
LT		 1236}
1237
a5b5bb9a
IM		 1238/*
1239 * Initialize an sk_lock.
1240 *
1241 * (We also register the sk_lock with the lock validator.)
1242 */
b6f99a21 1243static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 1244{
ed07536e
PZ		 1245 sock_lock_init_class_and_name(sk,
1246 af_family_slock_key_strings[sk->sk_family],
1247 af_family_slock_keys + sk->sk_family,
1248 af_family_key_strings[sk->sk_family],
1249 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 1250}
1251
4dc6dc71
ED		 1252/*
1253 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1254 * even temporarly, because of RCU lookups. sk_node should also be left as is.
68835aba 1255 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
4dc6dc71 1256 */
f1a6c4da
PE		 1257static void sock_copy(struct sock *nsk, const struct sock *osk)
1258{
1259#ifdef CONFIG_SECURITY_NETWORK
1260 void *sptr = nsk->sk_security;
1261#endif
68835aba
ED		 1262 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1263
1264 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1265 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1266
f1a6c4da
PE		 1267#ifdef CONFIG_SECURITY_NETWORK
1268 nsk->sk_security = sptr;
1269 security_sk_clone(osk, nsk);
1270#endif
1271}
1272
fcbdf09d
OP		 1273void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1274{
1275 unsigned long nulls1, nulls2;
1276
1277 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1278 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1279 if (nulls1 > nulls2)
1280 swap(nulls1, nulls2);
1281
1282 if (nulls1 != 0)
1283 memset((char *)sk, 0, nulls1);
1284 memset((char *)sk + nulls1 + sizeof(void *), 0,
1285 nulls2 - nulls1 - sizeof(void *));
1286 memset((char *)sk + nulls2 + sizeof(void *), 0,
1287 size - nulls2 - sizeof(void *));
1288}
1289EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1290
2e4afe7b
PE		 1291static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1292 int family)
c308c1b2
PE		 1293{
1294 struct sock *sk;
1295 struct kmem_cache *slab;
1296
1297 slab = prot->slab;
e912b114
ED		 1298 if (slab != NULL) {
1299 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1300 if (!sk)
1301 return sk;
1302 if (priority & __GFP_ZERO) {
fcbdf09d
OP		 1303 if (prot->clear_sk)
1304 prot->clear_sk(sk, prot->obj_size);
1305 else
1306 sk_prot_clear_nulls(sk, prot->obj_size);
e912b114 1307 }
fcbdf09d 1308 } else
c308c1b2
PE		 1309 sk = kmalloc(prot->obj_size, priority);
1310
2e4afe7b 1311 if (sk != NULL) {
a98b65a3
VN		 1312 kmemcheck_annotate_bitfield(sk, flags);
1313
2e4afe7b
PE		 1314 if (security_sk_alloc(sk, family, priority))
1315 goto out_free;
1316
1317 if (!try_module_get(prot->owner))
1318 goto out_free_sec;
e022f0b4 1319 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1320 }
1321
c308c1b2 1322 return sk;
2e4afe7b
PE		 1323
1324out_free_sec:
1325 security_sk_free(sk);
1326out_free:
1327 if (slab != NULL)
1328 kmem_cache_free(slab, sk);
1329 else
1330 kfree(sk);
1331 return NULL;
c308c1b2
PE		 1332}
1333
1334static void sk_prot_free(struct proto *prot, struct sock *sk)
1335{
1336 struct kmem_cache *slab;
2e4afe7b 1337 struct module *owner;
c308c1b2 1338
2e4afe7b 1339 owner = prot->owner;
c308c1b2 1340 slab = prot->slab;
2e4afe7b
PE		 1341
1342 security_sk_free(sk);
c308c1b2
PE		 1343 if (slab != NULL)
1344 kmem_cache_free(slab, sk);
1345 else
1346 kfree(sk);
2e4afe7b 1347 module_put(owner);
c308c1b2
PE		 1348}
1349
86f8515f 1350#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
6ffd4641 1351void sock_update_netprioidx(struct sock *sk)
5bc1421e 1352{
5bc1421e
NH		 1353 if (in_interrupt())
1354 return;
2b73bc65 1355
6ffd4641 1356 sk->sk_cgrp_prioidx = task_netprioidx(current);
5bc1421e
NH		 1357}
1358EXPORT_SYMBOL_GPL(sock_update_netprioidx);
f8451725
HX		 1359#endif
1360
1da177e4
LT		 1361/**
1362 * sk_alloc - All socket objects are allocated here
c4ea43c5 1363 * @net: the applicable net namespace
4dc3b16b
PP		 1364 * @family: protocol family
1365 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1366 * @prot: struct proto associated with this new sock instance
1da177e4 1367 */
1b8d7ae4 1368struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1369 struct proto *prot)
1da177e4 1370{
c308c1b2 1371 struct sock *sk;
1da177e4 1372
154adbc8 1373 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1374 if (sk) {
154adbc8
PE		 1375 sk->sk_family = family;
1376 /*
1377 * See comment in struct sock definition to understand
1378 * why we need sk_prot_creator -acme
1379 */
1380 sk->sk_prot = sk->sk_prot_creator = prot;
1381 sock_lock_init(sk);
3b1e0a65 1382 sock_net_set(sk, get_net(net));
d66ee058 1383 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725 1384
211d2f97 1385 sock_update_classid(sk);
6ffd4641 1386 sock_update_netprioidx(sk);
1da177e4 1387 }
a79af59e 1388
2e4afe7b 1389 return sk;
1da177e4 1390}
2a91525c 1391EXPORT_SYMBOL(sk_alloc);
1da177e4 1392
2b85a34e 1393static void __sk_free(struct sock *sk)
1da177e4
LT		 1394{
1395 struct sk_filter *filter;
1da177e4
LT		 1396
1397 if (sk->sk_destruct)
1398 sk->sk_destruct(sk);
1399
a898def2
PM		 1400 filter = rcu_dereference_check(sk->sk_filter,
1401 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1402 if (filter) {
309dd5fc 1403 sk_filter_uncharge(sk, filter);
a9b3cd7f 1404 RCU_INIT_POINTER(sk->sk_filter, NULL);
1da177e4
LT		 1405 }
1406
08e29af3 1407 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1da177e4
LT		 1408
1409 if (atomic_read(&sk->sk_omem_alloc))
e005d193
JP		 1410 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1411 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1412
109f6e39
EB		 1413 if (sk->sk_peer_cred)
1414 put_cred(sk->sk_peer_cred);
1415 put_pid(sk->sk_peer_pid);
3b1e0a65 1416 put_net(sock_net(sk));
c308c1b2 1417 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1418}
2b85a34e
ED		 1419
1420void sk_free(struct sock *sk)
1421{
1422 /*
25985edc 1423 * We subtract one from sk_wmem_alloc and can know if
2b85a34e
ED		 1424 * some packets are still in some tx queue.
1425 * If not null, sock_wfree() will call __sk_free(sk) later
1426 */
1427 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1428 __sk_free(sk);
1429}
2a91525c 1430EXPORT_SYMBOL(sk_free);
1da177e4 1431
edf02087 1432/*
25985edc
LDM		 1433 * Last sock_put should drop reference to sk->sk_net. It has already
1434 * been dropped in sk_change_net. Taking reference to stopping namespace
edf02087 1435 * is not an option.
25985edc 1436 * Take reference to a socket to remove it from hash _alive_ and after that
edf02087
DL		 1437 * destroy it in the context of init_net.
1438 */
1439void sk_release_kernel(struct sock *sk)
1440{
1441 if (sk == NULL || sk->sk_socket == NULL)
1442 return;
1443
1444 sock_hold(sk);
1445 sock_release(sk->sk_socket);
65a18ec5 1446 release_net(sock_net(sk));
3b1e0a65 1447 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1448 sock_put(sk);
1449}
45af1754 1450EXPORT_SYMBOL(sk_release_kernel);
edf02087 1451
475f1b52
SR		 1452static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1453{
1454 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1455 sock_update_memcg(newsk);
1456}
1457
e56c57d0
ED		 1458/**
1459 * sk_clone_lock - clone a socket, and lock its clone
1460 * @sk: the socket to clone
1461 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1462 *
1463 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1464 */
1465struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
87d11ceb 1466{
8fd1d178 1467 struct sock *newsk;
278571ba 1468 bool is_charged = true;
87d11ceb 1469
8fd1d178 1470 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1471 if (newsk != NULL) {
1472 struct sk_filter *filter;
1473
892c141e 1474 sock_copy(newsk, sk);
87d11ceb
ACM		 1475
1476 /* SANITY */
3b1e0a65 1477 get_net(sock_net(newsk));
87d11ceb
ACM		 1478 sk_node_init(&newsk->sk_node);
1479 sock_lock_init(newsk);
1480 bh_lock_sock(newsk);
fa438ccf 1481 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1482 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1483
1484 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1485 /*
1486 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1487 */
1488 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1489 atomic_set(&newsk->sk_omem_alloc, 0);
1490 skb_queue_head_init(&newsk->sk_receive_queue);
1491 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1492#ifdef CONFIG_NET_DMA
1493 skb_queue_head_init(&newsk->sk_async_wait_queue);
1494#endif
87d11ceb 1495
b6c6712a 1496 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1497 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1498 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1499 af_callback_keys + newsk->sk_family,
1500 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1501
1502 newsk->sk_dst_cache = NULL;
1503 newsk->sk_wmem_queued = 0;
1504 newsk->sk_forward_alloc = 0;
1505 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1506 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1507
1508 sock_reset_flag(newsk, SOCK_DONE);
1509 skb_queue_head_init(&newsk->sk_error_queue);
1510
0d7da9dd 1511 filter = rcu_dereference_protected(newsk->sk_filter, 1);
87d11ceb 1512 if (filter != NULL)
278571ba
AS		 1513 /* though it's an empty new sock, the charging may fail
1514 * if sysctl_optmem_max was changed between creation of
1515 * original socket and cloning
1516 */
1517 is_charged = sk_filter_charge(newsk, filter);
87d11ceb 1518
278571ba 1519 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk))) {
87d11ceb
ACM		 1520 /* It is still raw copy of parent, so invalidate
1521 * destructor and make plain sk_free() */
1522 newsk->sk_destruct = NULL;
b0691c8e 1523 bh_unlock_sock(newsk);
87d11ceb
ACM		 1524 sk_free(newsk);
1525 newsk = NULL;
1526 goto out;
1527 }
1528
1529 newsk->sk_err = 0;
1530 newsk->sk_priority = 0;
4dc6dc71
ED		 1531 /*
1532 * Before updating sk_refcnt, we must commit prior changes to memory
1533 * (Documentation/RCU/rculist_nulls.txt for details)
1534 */
1535 smp_wmb();
87d11ceb
ACM		 1536 atomic_set(&newsk->sk_refcnt, 2);
1537
1538 /*
1539 * Increment the counter in the same struct proto as the master
1540 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1541 * is the same as sk->sk_prot->socks, as this field was copied
1542 * with memcpy).
1543 *
1544 * This _changes_ the previous behaviour, where
1545 * tcp_create_openreq_child always was incrementing the
1546 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1547 * to be taken into account in all callers. -acme
1548 */
1549 sk_refcnt_debug_inc(newsk);
972692e0 1550 sk_set_socket(newsk, NULL);
43815482 1551 newsk->sk_wq = NULL;
87d11ceb 1552
f3f511e1
GC		 1553 sk_update_clone(sk, newsk);
1554
87d11ceb 1555 if (newsk->sk_prot->sockets_allocated)
180d8cd9 1556 sk_sockets_allocated_inc(newsk);
704da560 1557
08e29af3 1558 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
704da560 1559 net_enable_timestamp();
87d11ceb
ACM		 1560 }
1561out:
1562 return newsk;
1563}
e56c57d0 1564EXPORT_SYMBOL_GPL(sk_clone_lock);
87d11ceb 1565
9958089a
AK		 1566void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1567{
1568 __sk_dst_set(sk, dst);
1569 sk->sk_route_caps = dst->dev->features;
1570 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1571 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1572 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1573 if (sk_can_gso(sk)) {
82cc1a7a 1574 if (dst->header_len) {
9958089a 1575 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1576 } else {
9958089a 1577 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a 1578 sk->sk_gso_max_size = dst->dev->gso_max_size;
1485348d 1579 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
82cc1a7a 1580 }
9958089a
AK		 1581 }
1582}
1583EXPORT_SYMBOL_GPL(sk_setup_caps);
1584
1da177e4
LT		 1585/*
1586 * Simple resource managers for sockets.
1587 */
1588
1589
4ec93edb
YH		 1590/*
1591 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1592 */
1593void sock_wfree(struct sk_buff *skb)
1594{
1595 struct sock *sk = skb->sk;
d99927f4 1596 unsigned int len = skb->truesize;
1da177e4 1597
d99927f4
ED		 1598 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1599 /*
1600 * Keep a reference on sk_wmem_alloc, this will be released
1601 * after sk_write_space() call
1602 */
1603 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1604 sk->sk_write_space(sk);
d99927f4
ED		 1605 len = 1;
1606 }
2b85a34e 1607 /*
d99927f4
ED		 1608 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1609 * could not do because of in-flight packets
2b85a34e 1610 */
d99927f4 1611 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1612 __sk_free(sk);
1da177e4 1613}
2a91525c 1614EXPORT_SYMBOL(sock_wfree);
1da177e4 1615
f2f872f9
ED		 1616void skb_orphan_partial(struct sk_buff *skb)
1617{
1618 /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc,
1619 * so we do not completely orphan skb, but transfert all
1620 * accounted bytes but one, to avoid unexpected reorders.
1621 */
1622 if (skb->destructor == sock_wfree
1623#ifdef CONFIG_INET
1624 || skb->destructor == tcp_wfree
1625#endif
1626 ) {
1627 atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc);
1628 skb->truesize = 1;
1629 } else {
1630 skb_orphan(skb);
1631 }
1632}
1633EXPORT_SYMBOL(skb_orphan_partial);
1634
4ec93edb
YH		 1635/*
1636 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1637 */
1638void sock_rfree(struct sk_buff *skb)
1639{
1640 struct sock *sk = skb->sk;
d361fd59 1641 unsigned int len = skb->truesize;
1da177e4 1642
d361fd59
ED		 1643 atomic_sub(len, &sk->sk_rmem_alloc);
1644 sk_mem_uncharge(sk, len);
1da177e4 1645}
2a91525c 1646EXPORT_SYMBOL(sock_rfree);
1da177e4 1647
41063e9d
DM		 1648void sock_edemux(struct sk_buff *skb)
1649{
e812347c
ED		 1650 struct sock *sk = skb->sk;
1651
1c463e57 1652#ifdef CONFIG_INET
e812347c
ED		 1653 if (sk->sk_state == TCP_TIME_WAIT)
1654 inet_twsk_put(inet_twsk(sk));
1655 else
1c463e57 1656#endif
e812347c 1657 sock_put(sk);
41063e9d
DM		 1658}
1659EXPORT_SYMBOL(sock_edemux);
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{
1726 kfree(mem);
1727 atomic_sub(size, &sk->sk_omem_alloc);
1728}
2a91525c 1729EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1730
1731/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1732 I think, these locks should be removed for datagram sockets.
1733 */
2a91525c 1734static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1735{
1736 DEFINE_WAIT(wait);
1737
1738 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1739 for (;;) {
1740 if (!timeo)
1741 break;
1742 if (signal_pending(current))
1743 break;
1744 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1745 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1746 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1747 break;
1748 if (sk->sk_shutdown & SEND_SHUTDOWN)
1749 break;
1750 if (sk->sk_err)
1751 break;
1752 timeo = schedule_timeout(timeo);
1753 }
aa395145 1754 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1755 return timeo;
1756}
1757
1758
1759/*
1760 * Generic send/receive buffer handlers
1761 */
1762
4cc7f68d
HX		 1763struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1764 unsigned long data_len, int noblock,
28d64271 1765 int *errcode, int max_page_order)
1da177e4 1766{
28d64271
ED		 1767 struct sk_buff *skb = NULL;
1768 unsigned long chunk;
7d877f3b 1769 gfp_t gfp_mask;
1da177e4
LT		 1770 long timeo;
1771 int err;
cc9b17ad 1772 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
28d64271
ED		 1773 struct page *page;
1774 int i;
cc9b17ad
JW		 1775
1776 err = -EMSGSIZE;
1777 if (npages > MAX_SKB_FRAGS)
1778 goto failure;
1da177e4 1779
1da177e4 1780 timeo = sock_sndtimeo(sk, noblock);
28d64271 1781 while (!skb) {
1da177e4
LT		 1782 err = sock_error(sk);
1783 if (err != 0)
1784 goto failure;
1785
1786 err = -EPIPE;
1787 if (sk->sk_shutdown & SEND_SHUTDOWN)
1788 goto failure;
1789
28d64271
ED		 1790 if (atomic_read(&sk->sk_wmem_alloc) >= sk->sk_sndbuf) {
1791 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1792 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1793 err = -EAGAIN;
1794 if (!timeo)
1795 goto failure;
1796 if (signal_pending(current))
1797 goto interrupted;
1798 timeo = sock_wait_for_wmem(sk, timeo);
1799 continue;
1800 }
1da177e4 1801
28d64271
ED		 1802 err = -ENOBUFS;
1803 gfp_mask = sk->sk_allocation;
1804 if (gfp_mask & __GFP_WAIT)
1805 gfp_mask |= __GFP_REPEAT;
1806
1807 skb = alloc_skb(header_len, gfp_mask);
1808 if (!skb)
1da177e4 1809 goto failure;
28d64271
ED		 1810
1811 skb->truesize += data_len;
1812
1813 for (i = 0; npages > 0; i++) {
1814 int order = max_page_order;
1815
1816 while (order) {
1817 if (npages >= 1 << order) {
1818 page = alloc_pages(sk->sk_allocation |
ed98df33
ED		 1819 __GFP_COMP |
1820 __GFP_NOWARN |
1821 __GFP_NORETRY,
28d64271
ED		 1822 order);
1823 if (page)
1824 goto fill_page;
d9b2938a
ED		 1825 /* Do not retry other high order allocations */
1826 order = 1;
1827 max_page_order = 0;
28d64271
ED		 1828 }
1829 order--;
1830 }
1831 page = alloc_page(sk->sk_allocation);
1832 if (!page)
1833 goto failure;
1834fill_page:
1835 chunk = min_t(unsigned long, data_len,
1836 PAGE_SIZE << order);
1837 skb_fill_page_desc(skb, i, page, 0, chunk);
1838 data_len -= chunk;
1839 npages -= 1 << order;
1da177e4 1840 }
1da177e4
LT		 1841 }
1842
1843 skb_set_owner_w(skb, sk);
1844 return skb;
1845
1846interrupted:
1847 err = sock_intr_errno(timeo);
1848failure:
28d64271 1849 kfree_skb(skb);
1da177e4
LT		 1850 *errcode = err;
1851 return NULL;
1852}
4cc7f68d 1853EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1854
4ec93edb 1855struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1856 int noblock, int *errcode)
1857{
28d64271 1858 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
1da177e4 1859}
2a91525c 1860EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4 1861
5640f768
ED		 1862/* On 32bit arches, an skb frag is limited to 2^15 */
1863#define SKB_FRAG_PAGE_ORDER get_order(32768)
1864
400dfd3a
ED		 1865/**
1866 * skb_page_frag_refill - check that a page_frag contains enough room
1867 * @sz: minimum size of the fragment we want to get
1868 * @pfrag: pointer to page_frag
1869 * @prio: priority for memory allocation
1870 *
1871 * Note: While this allocator tries to use high order pages, there is
1872 * no guarantee that allocations succeed. Therefore, @sz MUST be
1873 * less or equal than PAGE_SIZE.
1874 */
d9b2938a 1875bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
5640f768 1876{
5640f768
ED		 1877 if (pfrag->page) {
1878 if (atomic_read(&pfrag->page->_count) == 1) {
1879 pfrag->offset = 0;
1880 return true;
1881 }
400dfd3a 1882 if (pfrag->offset + sz <= pfrag->size)
5640f768
ED		 1883 return true;
1884 put_page(pfrag->page);
1885 }
1886
d9b2938a
ED		 1887 pfrag->offset = 0;
1888 if (SKB_FRAG_PAGE_ORDER) {
1889 pfrag->page = alloc_pages(gfp | __GFP_COMP |
1890 __GFP_NOWARN | __GFP_NORETRY,
1891 SKB_FRAG_PAGE_ORDER);
5640f768 1892 if (likely(pfrag->page)) {
d9b2938a 1893 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
5640f768
ED		 1894 return true;
1895 }
d9b2938a
ED		 1896 }
1897 pfrag->page = alloc_page(gfp);
1898 if (likely(pfrag->page)) {
1899 pfrag->size = PAGE_SIZE;
1900 return true;
1901 }
400dfd3a
ED		 1902 return false;
1903}
1904EXPORT_SYMBOL(skb_page_frag_refill);
1905
1906bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1907{
1908 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
1909 return true;
1910
5640f768
ED		 1911 sk_enter_memory_pressure(sk);
1912 sk_stream_moderate_sndbuf(sk);
1913 return false;
1914}
1915EXPORT_SYMBOL(sk_page_frag_refill);
1916
1da177e4 1917static void __lock_sock(struct sock *sk)
f39234d6
NK		 1918 __releases(&sk->sk_lock.slock)
1919 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1920{
1921 DEFINE_WAIT(wait);
1922
e71a4783 1923 for (;;) {
1da177e4
LT		 1924 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1925 TASK_UNINTERRUPTIBLE);
1926 spin_unlock_bh(&sk->sk_lock.slock);
1927 schedule();
1928 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1929 if (!sock_owned_by_user(sk))
1da177e4
LT		 1930 break;
1931 }
1932 finish_wait(&sk->sk_lock.wq, &wait);
1933}
1934
1935static void __release_sock(struct sock *sk)
f39234d6
NK		 1936 __releases(&sk->sk_lock.slock)
1937 __acquires(&sk->sk_lock.slock)
1da177e4
LT		 1938{
1939 struct sk_buff *skb = sk->sk_backlog.head;
1940
1941 do {
1942 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1943 bh_unlock_sock(sk);
1944
1945 do {
1946 struct sk_buff *next = skb->next;
1947
e4cbb02a 1948 prefetch(next);
7fee226a 1949 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1950 skb->next = NULL;
c57943a1 1951 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1952
1953 /*
1954 * We are in process context here with softirqs
1955 * disabled, use cond_resched_softirq() to preempt.
1956 * This is safe to do because we've taken the backlog
1957 * queue private:
1958 */
1959 cond_resched_softirq();
1960
1961 skb = next;
1962 } while (skb != NULL);
1963
1964 bh_lock_sock(sk);
e71a4783 1965 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1966
1967 /*
1968 * Doing the zeroing here guarantee we can not loop forever
1969 * while a wild producer attempts to flood us.
1970 */
1971 sk->sk_backlog.len = 0;
1da177e4
LT		 1972}
1973
1974/**
1975 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1976 * @sk: sock to wait on
1977 * @timeo: for how long
1da177e4
LT		 1978 *
1979 * Now socket state including sk->sk_err is changed only under lock,
1980 * hence we may omit checks after joining wait queue.
1981 * We check receive queue before schedule() only as optimization;
1982 * it is very likely that release_sock() added new data.
1983 */
1984int sk_wait_data(struct sock *sk, long *timeo)
1985{
1986 int rc;
1987 DEFINE_WAIT(wait);
1988
aa395145 1989 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1990 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1991 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1992 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1993 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1994 return rc;
1995}
1da177e4
LT		 1996EXPORT_SYMBOL(sk_wait_data);
1997
3ab224be
HA		 1998/**
1999 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2000 * @sk: socket
2001 * @size: memory size to allocate
2002 * @kind: allocation type
2003 *
2004 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2005 * rmem allocation. This function assumes that protocols which have
2006 * memory_pressure use sk_wmem_queued as write buffer accounting.
2007 */
2008int __sk_mem_schedule(struct sock *sk, int size, int kind)
2009{
2010 struct proto *prot = sk->sk_prot;
2011 int amt = sk_mem_pages(size);
8d987e5c 2012 long allocated;
e1aab161 2013 int parent_status = UNDER_LIMIT;
3ab224be
HA		 2014
2015 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
180d8cd9 2016
e1aab161 2017 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
3ab224be
HA		 2018
2019 /* Under limit. */
e1aab161
GC		 2020 if (parent_status == UNDER_LIMIT &&
2021 allocated <= sk_prot_mem_limits(sk, 0)) {
180d8cd9 2022 sk_leave_memory_pressure(sk);
3ab224be
HA		 2023 return 1;
2024 }
2025
e1aab161
GC		 2026 /* Under pressure. (we or our parents) */
2027 if ((parent_status > SOFT_LIMIT) ||
2028 allocated > sk_prot_mem_limits(sk, 1))
180d8cd9 2029 sk_enter_memory_pressure(sk);
3ab224be 2030
e1aab161
GC		 2031 /* Over hard limit (we or our parents) */
2032 if ((parent_status == OVER_LIMIT) ||
2033 (allocated > sk_prot_mem_limits(sk, 2)))
3ab224be
HA		 2034 goto suppress_allocation;
2035
2036 /* guarantee minimum buffer size under pressure */
2037 if (kind == SK_MEM_RECV) {
2038 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
2039 return 1;
180d8cd9 2040
3ab224be
HA		 2041 } else { /* SK_MEM_SEND */
2042 if (sk->sk_type == SOCK_STREAM) {
2043 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
2044 return 1;
2045 } else if (atomic_read(&sk->sk_wmem_alloc) <
2046 prot->sysctl_wmem[0])
2047 return 1;
2048 }
2049
180d8cd9 2050 if (sk_has_memory_pressure(sk)) {
1748376b
ED		 2051 int alloc;
2052
180d8cd9 2053 if (!sk_under_memory_pressure(sk))
1748376b 2054 return 1;
180d8cd9
GC		 2055 alloc = sk_sockets_allocated_read_positive(sk);
2056 if (sk_prot_mem_limits(sk, 2) > alloc *
3ab224be
HA		 2057 sk_mem_pages(sk->sk_wmem_queued +
2058 atomic_read(&sk->sk_rmem_alloc) +
2059 sk->sk_forward_alloc))
2060 return 1;
2061 }
2062
2063suppress_allocation:
2064
2065 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
2066 sk_stream_moderate_sndbuf(sk);
2067
2068 /* Fail only if socket is _under_ its sndbuf.
2069 * In this case we cannot block, so that we have to fail.
2070 */
2071 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
2072 return 1;
2073 }
2074
3847ce32
SM		 2075 trace_sock_exceed_buf_limit(sk, prot, allocated);
2076
3ab224be
HA		 2077 /* Alas. Undo changes. */
2078 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
180d8cd9 2079
0e90b31f 2080 sk_memory_allocated_sub(sk, amt);
180d8cd9 2081
3ab224be
HA		 2082 return 0;
2083}
3ab224be
HA		 2084EXPORT_SYMBOL(__sk_mem_schedule);
2085
2086/**
2087 * __sk_reclaim - reclaim memory_allocated
2088 * @sk: socket
2089 */
2090void __sk_mem_reclaim(struct sock *sk)
2091{
180d8cd9 2092 sk_memory_allocated_sub(sk,
0e90b31f 2093 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
3ab224be
HA		 2094 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
2095
180d8cd9
GC		 2096 if (sk_under_memory_pressure(sk) &&
2097 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
2098 sk_leave_memory_pressure(sk);
3ab224be 2099}
3ab224be
HA		 2100EXPORT_SYMBOL(__sk_mem_reclaim);
2101
2102
1da177e4
LT		 2103/*
2104 * Set of default routines for initialising struct proto_ops when
2105 * the protocol does not support a particular function. In certain
2106 * cases where it makes no sense for a protocol to have a "do nothing"
2107 * function, some default processing is provided.
2108 */
2109
2110int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
2111{
2112 return -EOPNOTSUPP;
2113}
2a91525c 2114EXPORT_SYMBOL(sock_no_bind);
1da177e4 2115
4ec93edb 2116int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2117 int len, int flags)
2118{
2119 return -EOPNOTSUPP;
2120}
2a91525c 2121EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 2122
2123int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
2124{
2125 return -EOPNOTSUPP;
2126}
2a91525c 2127EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 2128
2129int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
2130{
2131 return -EOPNOTSUPP;
2132}
2a91525c 2133EXPORT_SYMBOL(sock_no_accept);
1da177e4 2134
4ec93edb 2135int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 2136 int *len, int peer)
2137{
2138 return -EOPNOTSUPP;
2139}
2a91525c 2140EXPORT_SYMBOL(sock_no_getname);
1da177e4 2141
2a91525c 2142unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 2143{
2144 return 0;
2145}
2a91525c 2146EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 2147
2148int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2149{
2150 return -EOPNOTSUPP;
2151}
2a91525c 2152EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 2153
2154int sock_no_listen(struct socket *sock, int backlog)
2155{
2156 return -EOPNOTSUPP;
2157}
2a91525c 2158EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 2159
2160int sock_no_shutdown(struct socket *sock, int how)
2161{
2162 return -EOPNOTSUPP;
2163}
2a91525c 2164EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 2165
2166int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 2167 char __user *optval, unsigned int optlen)
1da177e4
LT		 2168{
2169 return -EOPNOTSUPP;
2170}
2a91525c 2171EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 2172
2173int sock_no_getsockopt(struct socket *sock, int level, int optname,
2174 char __user *optval, int __user *optlen)
2175{
2176 return -EOPNOTSUPP;
2177}
2a91525c 2178EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 2179
2180int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2181 size_t len)
2182{
2183 return -EOPNOTSUPP;
2184}
2a91525c 2185EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 2186
2187int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2188 size_t len, int flags)
2189{
2190 return -EOPNOTSUPP;
2191}
2a91525c 2192EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 2193
2194int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2195{
2196 /* Mirror missing mmap method error code */
2197 return -ENODEV;
2198}
2a91525c 2199EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 2200
2201ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2202{
2203 ssize_t res;
2204 struct msghdr msg = {.msg_flags = flags};
2205 struct kvec iov;
2206 char *kaddr = kmap(page);
2207 iov.iov_base = kaddr + offset;
2208 iov.iov_len = size;
2209 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2210 kunmap(page);
2211 return res;
2212}
2a91525c 2213EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 2214
2215/*
2216 * Default Socket Callbacks
2217 */
2218
2219static void sock_def_wakeup(struct sock *sk)
2220{
43815482
ED		 2221 struct socket_wq *wq;
2222
2223 rcu_read_lock();
2224 wq = rcu_dereference(sk->sk_wq);
2225 if (wq_has_sleeper(wq))
2226 wake_up_interruptible_all(&wq->wait);
2227 rcu_read_unlock();
1da177e4
LT		 2228}
2229
2230static void sock_def_error_report(struct sock *sk)
2231{
43815482
ED		 2232 struct socket_wq *wq;
2233
2234 rcu_read_lock();
2235 wq = rcu_dereference(sk->sk_wq);
2236 if (wq_has_sleeper(wq))
2237 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 2238 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 2239 rcu_read_unlock();
1da177e4
LT		 2240}
2241
676d2369 2242static void sock_def_readable(struct sock *sk)
1da177e4 2243{
43815482
ED		 2244 struct socket_wq *wq;
2245
2246 rcu_read_lock();
2247 wq = rcu_dereference(sk->sk_wq);
2248 if (wq_has_sleeper(wq))
2c6607c6 2249 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
37e5540b 2250 POLLRDNORM | POLLRDBAND);
8d8ad9d7 2251 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 2252 rcu_read_unlock();
1da177e4
LT		 2253}
2254
2255static void sock_def_write_space(struct sock *sk)
2256{
43815482
ED		 2257 struct socket_wq *wq;
2258
2259 rcu_read_lock();
1da177e4
LT		 2260
2261 /* Do not wake up a writer until he can make "significant"
2262 * progress. --DaveM
2263 */
e71a4783 2264 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 2265 wq = rcu_dereference(sk->sk_wq);
2266 if (wq_has_sleeper(wq))
2267 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 2268 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 2269
2270 /* Should agree with poll, otherwise some programs break */
2271 if (sock_writeable(sk))
8d8ad9d7 2272 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 2273 }
2274
43815482 2275 rcu_read_unlock();
1da177e4
LT		 2276}
2277
2278static void sock_def_destruct(struct sock *sk)
2279{
a51482bd 2280 kfree(sk->sk_protinfo);
1da177e4
LT		 2281}
2282
2283void sk_send_sigurg(struct sock *sk)
2284{
2285 if (sk->sk_socket && sk->sk_socket->file)
2286 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 2287 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 2288}
2a91525c 2289EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 2290
2291void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2292 unsigned long expires)
2293{
2294 if (!mod_timer(timer, expires))
2295 sock_hold(sk);
2296}
1da177e4
LT		 2297EXPORT_SYMBOL(sk_reset_timer);
2298
2299void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2300{
25cc4ae9 2301 if (del_timer(timer))
1da177e4
LT		 2302 __sock_put(sk);
2303}
1da177e4
LT		 2304EXPORT_SYMBOL(sk_stop_timer);
2305
2306void sock_init_data(struct socket *sock, struct sock *sk)
2307{
2308 skb_queue_head_init(&sk->sk_receive_queue);
2309 skb_queue_head_init(&sk->sk_write_queue);
2310 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 2311#ifdef CONFIG_NET_DMA
2312 skb_queue_head_init(&sk->sk_async_wait_queue);
2313#endif
1da177e4
LT		 2314
2315 sk->sk_send_head = NULL;
2316
2317 init_timer(&sk->sk_timer);
4ec93edb 2318
1da177e4
LT		 2319 sk->sk_allocation = GFP_KERNEL;
2320 sk->sk_rcvbuf = sysctl_rmem_default;
2321 sk->sk_sndbuf = sysctl_wmem_default;
2322 sk->sk_state = TCP_CLOSE;
972692e0 2323 sk_set_socket(sk, sock);
1da177e4
LT		 2324
2325 sock_set_flag(sk, SOCK_ZAPPED);
2326
e71a4783 2327 if (sock) {
1da177e4 2328 sk->sk_type = sock->type;
43815482 2329 sk->sk_wq = sock->wq;
1da177e4
LT		 2330 sock->sk = sk;
2331 } else
43815482 2332 sk->sk_wq = NULL;
1da177e4 2333
b6c6712a 2334 spin_lock_init(&sk->sk_dst_lock);
1da177e4 2335 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 2336 lockdep_set_class_and_name(&sk->sk_callback_lock,
2337 af_callback_keys + sk->sk_family,
2338 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 2339
2340 sk->sk_state_change = sock_def_wakeup;
2341 sk->sk_data_ready = sock_def_readable;
2342 sk->sk_write_space = sock_def_write_space;
2343 sk->sk_error_report = sock_def_error_report;
2344 sk->sk_destruct = sock_def_destruct;
2345
5640f768
ED		 2346 sk->sk_frag.page = NULL;
2347 sk->sk_frag.offset = 0;
ef64a54f 2348 sk->sk_peek_off = -1;
1da177e4 2349
109f6e39
EB		 2350 sk->sk_peer_pid = NULL;
2351 sk->sk_peer_cred = NULL;
1da177e4
LT		 2352 sk->sk_write_pending = 0;
2353 sk->sk_rcvlowat = 1;
2354 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2355 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2356
f37f0afb 2357 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 2358
e0d1095a 2359#ifdef CONFIG_NET_RX_BUSY_POLL
06021292 2360 sk->sk_napi_id = 0;
64b0dc51 2361 sk->sk_ll_usec = sysctl_net_busy_read;
06021292
ET		 2362#endif
2363
62748f32 2364 sk->sk_max_pacing_rate = ~0U;
7eec4174 2365 sk->sk_pacing_rate = ~0U;
4dc6dc71
ED		 2366 /*
2367 * Before updating sk_refcnt, we must commit prior changes to memory
2368 * (Documentation/RCU/rculist_nulls.txt for details)
2369 */
2370 smp_wmb();
1da177e4 2371 atomic_set(&sk->sk_refcnt, 1);
33c732c3 2372 atomic_set(&sk->sk_drops, 0);
1da177e4 2373}
2a91525c 2374EXPORT_SYMBOL(sock_init_data);
1da177e4 2375
b5606c2d 2376void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 2377{
2378 might_sleep();
a5b5bb9a 2379 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2380 if (sk->sk_lock.owned)
1da177e4 2381 __lock_sock(sk);
d2e9117c 2382 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2383 spin_unlock(&sk->sk_lock.slock);
2384 /*
2385 * The sk_lock has mutex_lock() semantics here:
2386 */
fcc70d5f 2387 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2388 local_bh_enable();
1da177e4 2389}
fcc70d5f 2390EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2391
b5606c2d 2392void release_sock(struct sock *sk)
1da177e4 2393{
a5b5bb9a
IM		 2394 /*
2395 * The sk_lock has mutex_unlock() semantics:
2396 */
2397 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2398
2399 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2400 if (sk->sk_backlog.tail)
2401 __release_sock(sk);
46d3ceab 2402
c3f9b018
ED		 2403 /* Warning : release_cb() might need to release sk ownership,
2404 * ie call sock_release_ownership(sk) before us.
2405 */
46d3ceab
ED		 2406 if (sk->sk_prot->release_cb)
2407 sk->sk_prot->release_cb(sk);
2408
c3f9b018 2409 sock_release_ownership(sk);
a5b5bb9a
IM		 2410 if (waitqueue_active(&sk->sk_lock.wq))
2411 wake_up(&sk->sk_lock.wq);
2412 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2413}
2414EXPORT_SYMBOL(release_sock);
2415
8a74ad60
ED		 2416/**
2417 * lock_sock_fast - fast version of lock_sock
2418 * @sk: socket
2419 *
2420 * This version should be used for very small section, where process wont block
2421 * return false if fast path is taken
2422 * sk_lock.slock locked, owned = 0, BH disabled
2423 * return true if slow path is taken
2424 * sk_lock.slock unlocked, owned = 1, BH enabled
2425 */
2426bool lock_sock_fast(struct sock *sk)
2427{
2428 might_sleep();
2429 spin_lock_bh(&sk->sk_lock.slock);
2430
2431 if (!sk->sk_lock.owned)
2432 /*
2433 * Note : We must disable BH
2434 */
2435 return false;
2436
2437 __lock_sock(sk);
2438 sk->sk_lock.owned = 1;
2439 spin_unlock(&sk->sk_lock.slock);
2440 /*
2441 * The sk_lock has mutex_lock() semantics here:
2442 */
2443 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2444 local_bh_enable();
2445 return true;
2446}
2447EXPORT_SYMBOL(lock_sock_fast);
2448
1da177e4 2449int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2450{
b7aa0bf7 2451 struct timeval tv;
1da177e4 2452 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2453 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2454 tv = ktime_to_timeval(sk->sk_stamp);
2455 if (tv.tv_sec == -1)
1da177e4 2456 return -ENOENT;
b7aa0bf7
ED		 2457 if (tv.tv_sec == 0) {
2458 sk->sk_stamp = ktime_get_real();
2459 tv = ktime_to_timeval(sk->sk_stamp);
2460 }
2461 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2462}
1da177e4
LT		 2463EXPORT_SYMBOL(sock_get_timestamp);
2464
ae40eb1e
ED		 2465int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2466{
2467 struct timespec ts;
2468 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2469 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2470 ts = ktime_to_timespec(sk->sk_stamp);
2471 if (ts.tv_sec == -1)
2472 return -ENOENT;
2473 if (ts.tv_sec == 0) {
2474 sk->sk_stamp = ktime_get_real();
2475 ts = ktime_to_timespec(sk->sk_stamp);
2476 }
2477 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2478}
2479EXPORT_SYMBOL(sock_get_timestampns);
2480
20d49473 2481void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2482{
20d49473 2483 if (!sock_flag(sk, flag)) {
08e29af3
ED		 2484 unsigned long previous_flags = sk->sk_flags;
2485
20d49473
PO		 2486 sock_set_flag(sk, flag);
2487 /*
2488 * we just set one of the two flags which require net
2489 * time stamping, but time stamping might have been on
2490 * already because of the other one
2491 */
08e29af3 2492 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
20d49473 2493 net_enable_timestamp();
1da177e4
LT		 2494 }
2495}
1da177e4 2496
cb820f8e
RC		 2497int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
2498 int level, int type)
2499{
2500 struct sock_exterr_skb *serr;
2501 struct sk_buff *skb, *skb2;
2502 int copied, err;
2503
2504 err = -EAGAIN;
2505 skb = skb_dequeue(&sk->sk_error_queue);
2506 if (skb == NULL)
2507 goto out;
2508
2509 copied = skb->len;
2510 if (copied > len) {
2511 msg->msg_flags |= MSG_TRUNC;
2512 copied = len;
2513 }
2514 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2515 if (err)
2516 goto out_free_skb;
2517
2518 sock_recv_timestamp(msg, sk, skb);
2519
2520 serr = SKB_EXT_ERR(skb);
2521 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
2522
2523 msg->msg_flags |= MSG_ERRQUEUE;
2524 err = copied;
2525
2526 /* Reset and regenerate socket error */
2527 spin_lock_bh(&sk->sk_error_queue.lock);
2528 sk->sk_err = 0;
2529 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
2530 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
2531 spin_unlock_bh(&sk->sk_error_queue.lock);
2532 sk->sk_error_report(sk);
2533 } else
2534 spin_unlock_bh(&sk->sk_error_queue.lock);
2535
2536out_free_skb:
2537 kfree_skb(skb);
2538out:
2539 return err;
2540}
2541EXPORT_SYMBOL(sock_recv_errqueue);
2542
1da177e4
LT		 2543/*
2544 * Get a socket option on an socket.
2545 *
2546 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2547 * asynchronous errors should be reported by getsockopt. We assume
2548 * this means if you specify SO_ERROR (otherwise whats the point of it).
2549 */
2550int sock_common_getsockopt(struct socket *sock, int level, int optname,
2551 char __user *optval, int __user *optlen)
2552{
2553 struct sock *sk = sock->sk;
2554
2555 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2556}
1da177e4
LT		 2557EXPORT_SYMBOL(sock_common_getsockopt);
2558
3fdadf7d 2559#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2560int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2561 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2562{
2563 struct sock *sk = sock->sk;
2564
1e51f951 2565 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2566 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2567 optval, optlen);
3fdadf7d
DM		 2568 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2569}
2570EXPORT_SYMBOL(compat_sock_common_getsockopt);
2571#endif
2572
1da177e4
LT		 2573int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2574 struct msghdr *msg, size_t size, int flags)
2575{
2576 struct sock *sk = sock->sk;
2577 int addr_len = 0;
2578 int err;
2579
2580 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2581 flags & ~MSG_DONTWAIT, &addr_len);
2582 if (err >= 0)
2583 msg->msg_namelen = addr_len;
2584 return err;
2585}
1da177e4
LT		 2586EXPORT_SYMBOL(sock_common_recvmsg);
2587
2588/*
2589 * Set socket options on an inet socket.
2590 */
2591int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2592 char __user *optval, unsigned int optlen)
1da177e4
LT		 2593{
2594 struct sock *sk = sock->sk;
2595
2596 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2597}
1da177e4
LT		 2598EXPORT_SYMBOL(sock_common_setsockopt);
2599
3fdadf7d 2600#ifdef CONFIG_COMPAT
543d9cfe 2601int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2602 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2603{
2604 struct sock *sk = sock->sk;
2605
543d9cfe
ACM		 2606 if (sk->sk_prot->compat_setsockopt != NULL)
2607 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2608 optval, optlen);
3fdadf7d
DM		 2609 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2610}
2611EXPORT_SYMBOL(compat_sock_common_setsockopt);
2612#endif
2613
1da177e4
LT		 2614void sk_common_release(struct sock *sk)
2615{
2616 if (sk->sk_prot->destroy)
2617 sk->sk_prot->destroy(sk);
2618
2619 /*
2620 * Observation: when sock_common_release is called, processes have
2621 * no access to socket. But net still has.
2622 * Step one, detach it from networking:
2623 *
2624 * A. Remove from hash tables.
2625 */
2626
2627 sk->sk_prot->unhash(sk);
2628
2629 /*
2630 * In this point socket cannot receive new packets, but it is possible
2631 * that some packets are in flight because some CPU runs receiver and
2632 * did hash table lookup before we unhashed socket. They will achieve
2633 * receive queue and will be purged by socket destructor.
2634 *
2635 * Also we still have packets pending on receive queue and probably,
2636 * our own packets waiting in device queues. sock_destroy will drain
2637 * receive queue, but transmitted packets will delay socket destruction
2638 * until the last reference will be released.
2639 */
2640
2641 sock_orphan(sk);
2642
2643 xfrm_sk_free_policy(sk);
2644
e6848976 2645 sk_refcnt_debug_release(sk);
5640f768
ED		 2646
2647 if (sk->sk_frag.page) {
2648 put_page(sk->sk_frag.page);
2649 sk->sk_frag.page = NULL;
2650 }
2651
1da177e4
LT		 2652 sock_put(sk);
2653}
1da177e4
LT		 2654EXPORT_SYMBOL(sk_common_release);
2655
13ff3d6f
PE		 2656#ifdef CONFIG_PROC_FS
2657#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2658struct prot_inuse {
2659 int val[PROTO_INUSE_NR];
2660};
13ff3d6f
PE		 2661
2662static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2663
2664#ifdef CONFIG_NET_NS
2665void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2666{
d6d9ca0f 2667 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
70ee1159
PE		 2668}
2669EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2670
2671int sock_prot_inuse_get(struct net *net, struct proto *prot)
2672{
2673 int cpu, idx = prot->inuse_idx;
2674 int res = 0;
2675
2676 for_each_possible_cpu(cpu)
2677 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2678
2679 return res >= 0 ? res : 0;
2680}
2681EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2682
2c8c1e72 2683static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2684{
2685 net->core.inuse = alloc_percpu(struct prot_inuse);
2686 return net->core.inuse ? 0 : -ENOMEM;
2687}
2688
2c8c1e72 2689static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2690{
2691 free_percpu(net->core.inuse);
2692}
2693
2694static struct pernet_operations net_inuse_ops = {
2695 .init = sock_inuse_init_net,
2696 .exit = sock_inuse_exit_net,
2697};
2698
2699static __init int net_inuse_init(void)
2700{
2701 if (register_pernet_subsys(&net_inuse_ops))
2702 panic("Cannot initialize net inuse counters");
2703
2704 return 0;
2705}
2706
2707core_initcall(net_inuse_init);
2708#else
1338d466
PE		 2709static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2710
c29a0bc4 2711void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466 2712{
d6d9ca0f 2713 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
1338d466
PE		 2714}
2715EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2716
c29a0bc4 2717int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2718{
2719 int cpu, idx = prot->inuse_idx;
2720 int res = 0;
2721
2722 for_each_possible_cpu(cpu)
2723 res += per_cpu(prot_inuse, cpu).val[idx];
2724
2725 return res >= 0 ? res : 0;
2726}
2727EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2728#endif
13ff3d6f
PE		 2729
2730static void assign_proto_idx(struct proto *prot)
2731{
2732 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2733
2734 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
e005d193 2735 pr_err("PROTO_INUSE_NR exhausted\n");
13ff3d6f
PE		 2736 return;
2737 }
2738
2739 set_bit(prot->inuse_idx, proto_inuse_idx);
2740}
2741
2742static void release_proto_idx(struct proto *prot)
2743{
2744 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2745 clear_bit(prot->inuse_idx, proto_inuse_idx);
2746}
2747#else
2748static inline void assign_proto_idx(struct proto *prot)
2749{
2750}
2751
2752static inline void release_proto_idx(struct proto *prot)
2753{
2754}
2755#endif
2756
b733c007
PE		 2757int proto_register(struct proto *prot, int alloc_slab)
2758{
1da177e4
LT		 2759 if (alloc_slab) {
2760 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2761 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2762 NULL);
1da177e4
LT		 2763
2764 if (prot->slab == NULL) {
e005d193
JP		 2765 pr_crit("%s: Can't create sock SLAB cache!\n",
2766 prot->name);
60e7663d 2767 goto out;
1da177e4 2768 }
2e6599cb
ACM		 2769
2770 if (prot->rsk_prot != NULL) {
faf23422 2771 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2772 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2773 goto out_free_sock_slab;
2774
7e56b5d6 2775 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2776 prot->rsk_prot->obj_size, 0,
20c2df83 2777 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2778
2779 if (prot->rsk_prot->slab == NULL) {
e005d193
JP		 2780 pr_crit("%s: Can't create request sock SLAB cache!\n",
2781 prot->name);
2e6599cb
ACM		 2782 goto out_free_request_sock_slab_name;
2783 }
2784 }
8feaf0c0 2785
6d6ee43e 2786 if (prot->twsk_prot != NULL) {
faf23422 2787 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2788
7e56b5d6 2789 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2790 goto out_free_request_sock_slab;
2791
6d6ee43e 2792 prot->twsk_prot->twsk_slab =
7e56b5d6 2793 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2794 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2795 0,
2796 SLAB_HWCACHE_ALIGN |
2797 prot->slab_flags,
20c2df83 2798 NULL);
6d6ee43e 2799 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2800 goto out_free_timewait_sock_slab_name;
2801 }
1da177e4
LT		 2802 }
2803
36b77a52 2804 mutex_lock(&proto_list_mutex);
1da177e4 2805 list_add(&prot->node, &proto_list);
13ff3d6f 2806 assign_proto_idx(prot);
36b77a52 2807 mutex_unlock(&proto_list_mutex);
b733c007
PE		 2808 return 0;
2809
8feaf0c0 2810out_free_timewait_sock_slab_name:
7e56b5d6 2811 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2812out_free_request_sock_slab:
2813 if (prot->rsk_prot && prot->rsk_prot->slab) {
2814 kmem_cache_destroy(prot->rsk_prot->slab);
2815 prot->rsk_prot->slab = NULL;
2816 }
2e6599cb 2817out_free_request_sock_slab_name:
72150e9b
DC		 2818 if (prot->rsk_prot)
2819 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2820out_free_sock_slab:
2821 kmem_cache_destroy(prot->slab);
2822 prot->slab = NULL;
b733c007
PE		 2823out:
2824 return -ENOBUFS;
1da177e4 2825}
1da177e4
LT		 2826EXPORT_SYMBOL(proto_register);
2827
2828void proto_unregister(struct proto *prot)
2829{
36b77a52 2830 mutex_lock(&proto_list_mutex);
13ff3d6f 2831 release_proto_idx(prot);
0a3f4358 2832 list_del(&prot->node);
36b77a52 2833 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2834
2835 if (prot->slab != NULL) {
2836 kmem_cache_destroy(prot->slab);
2837 prot->slab = NULL;
2838 }
2839
2e6599cb 2840 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2841 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2842 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2843 prot->rsk_prot->slab = NULL;
2844 }
2845
6d6ee43e 2846 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2847 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2848 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2849 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2850 }
1da177e4 2851}
1da177e4
LT		 2852EXPORT_SYMBOL(proto_unregister);
2853
2854#ifdef CONFIG_PROC_FS
1da177e4 2855static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
36b77a52 2856 __acquires(proto_list_mutex)
1da177e4 2857{
36b77a52 2858 mutex_lock(&proto_list_mutex);
60f0438a 2859 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2860}
2861
2862static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2863{
60f0438a 2864 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2865}
2866
2867static void proto_seq_stop(struct seq_file *seq, void *v)
36b77a52 2868 __releases(proto_list_mutex)
1da177e4 2869{
36b77a52 2870 mutex_unlock(&proto_list_mutex);
1da177e4
LT		 2871}
2872
2873static char proto_method_implemented(const void *method)
2874{
2875 return method == NULL ? 'n' : 'y';
2876}
180d8cd9
GC		 2877static long sock_prot_memory_allocated(struct proto *proto)
2878{
cb75a36c 2879 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
180d8cd9
GC		 2880}
2881
2882static char *sock_prot_memory_pressure(struct proto *proto)
2883{
2884 return proto->memory_pressure != NULL ?
2885 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2886}
1da177e4
LT		 2887
2888static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2889{
180d8cd9 2890
8d987e5c 2891 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
1da177e4
LT		 2892 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2893 proto->name,
2894 proto->obj_size,
14e943db 2895 sock_prot_inuse_get(seq_file_net(seq), proto),
180d8cd9
GC		 2896 sock_prot_memory_allocated(proto),
2897 sock_prot_memory_pressure(proto),
1da177e4
LT		 2898 proto->max_header,
2899 proto->slab == NULL ? "no" : "yes",
2900 module_name(proto->owner),
2901 proto_method_implemented(proto->close),
2902 proto_method_implemented(proto->connect),
2903 proto_method_implemented(proto->disconnect),
2904 proto_method_implemented(proto->accept),
2905 proto_method_implemented(proto->ioctl),
2906 proto_method_implemented(proto->init),
2907 proto_method_implemented(proto->destroy),
2908 proto_method_implemented(proto->shutdown),
2909 proto_method_implemented(proto->setsockopt),
2910 proto_method_implemented(proto->getsockopt),
2911 proto_method_implemented(proto->sendmsg),
2912 proto_method_implemented(proto->recvmsg),
2913 proto_method_implemented(proto->sendpage),
2914 proto_method_implemented(proto->bind),
2915 proto_method_implemented(proto->backlog_rcv),
2916 proto_method_implemented(proto->hash),
2917 proto_method_implemented(proto->unhash),
2918 proto_method_implemented(proto->get_port),
2919 proto_method_implemented(proto->enter_memory_pressure));
2920}
2921
2922static int proto_seq_show(struct seq_file *seq, void *v)
2923{
60f0438a 2924 if (v == &proto_list)
1da177e4
LT		 2925 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2926 "protocol",
2927 "size",
2928 "sockets",
2929 "memory",
2930 "press",
2931 "maxhdr",
2932 "slab",
2933 "module",
2934 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2935 else
60f0438a 2936 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2937 return 0;
2938}
2939
f690808e 2940static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2941 .start = proto_seq_start,
2942 .next = proto_seq_next,
2943 .stop = proto_seq_stop,
2944 .show = proto_seq_show,
2945};
2946
2947static int proto_seq_open(struct inode *inode, struct file *file)
2948{
14e943db
ED		 2949 return seq_open_net(inode, file, &proto_seq_ops,
2950 sizeof(struct seq_net_private));
1da177e4
LT		 2951}
2952
9a32144e 2953static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2954 .owner = THIS_MODULE,
2955 .open = proto_seq_open,
2956 .read = seq_read,
2957 .llseek = seq_lseek,
14e943db
ED		 2958 .release = seq_release_net,
2959};
2960
2961static __net_init int proto_init_net(struct net *net)
2962{
d4beaa66 2963 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops))
14e943db
ED		 2964 return -ENOMEM;
2965
2966 return 0;
2967}
2968
2969static __net_exit void proto_exit_net(struct net *net)
2970{
ece31ffd 2971 remove_proc_entry("protocols", net->proc_net);
14e943db
ED		 2972}
2973
2974
2975static __net_initdata struct pernet_operations proto_net_ops = {
2976 .init = proto_init_net,
2977 .exit = proto_exit_net,
1da177e4
LT		 2978};
2979
2980static int __init proto_init(void)
2981{
14e943db 2982 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2983}
2984
2985subsys_initcall(proto_init);
2986
2987#endif /* PROC_FS */
Linux kernel - Deliverables
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