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[deliverable/linux.git] / net / core / sock.c
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 *
10 * Authors: Ross Biro
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
35 * code. The ACK stuff can wait and needs major
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
92 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93
94 #include <linux/capability.h>
95 #include <linux/errno.h>
96 #include <linux/types.h>
97 #include <linux/socket.h>
98 #include <linux/in.h>
99 #include <linux/kernel.h>
100 #include <linux/module.h>
101 #include <linux/proc_fs.h>
102 #include <linux/seq_file.h>
103 #include <linux/sched.h>
104 #include <linux/timer.h>
105 #include <linux/string.h>
106 #include <linux/sockios.h>
107 #include <linux/net.h>
108 #include <linux/mm.h>
109 #include <linux/slab.h>
110 #include <linux/interrupt.h>
111 #include <linux/poll.h>
112 #include <linux/tcp.h>
113 #include <linux/init.h>
114 #include <linux/highmem.h>
115 #include <linux/user_namespace.h>
116 #include <linux/static_key.h>
117 #include <linux/memcontrol.h>
118 #include <linux/prefetch.h>
119
120 #include <asm/uaccess.h>
121
122 #include <linux/netdevice.h>
123 #include <net/protocol.h>
124 #include <linux/skbuff.h>
125 #include <net/net_namespace.h>
126 #include <net/request_sock.h>
127 #include <net/sock.h>
128 #include <linux/net_tstamp.h>
129 #include <net/xfrm.h>
130 #include <linux/ipsec.h>
131 #include <net/cls_cgroup.h>
132 #include <net/netprio_cgroup.h>
133
134 #include <linux/filter.h>
135
136 #include <trace/events/sock.h>
137
138 #ifdef CONFIG_INET
139 #include <net/tcp.h>
140 #endif
141
142 static DEFINE_MUTEX(proto_list_mutex);
143 static LIST_HEAD(proto_list);
144
145 #ifdef CONFIG_MEMCG_KMEM
146 int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
147 {
148 struct proto *proto;
149 int ret = 0;
150
151 mutex_lock(&proto_list_mutex);
152 list_for_each_entry(proto, &proto_list, node) {
153 if (proto->init_cgroup) {
154 ret = proto->init_cgroup(memcg, ss);
155 if (ret)
156 goto out;
157 }
158 }
159
160 mutex_unlock(&proto_list_mutex);
161 return ret;
162 out:
163 list_for_each_entry_continue_reverse(proto, &proto_list, node)
164 if (proto->destroy_cgroup)
165 proto->destroy_cgroup(memcg);
166 mutex_unlock(&proto_list_mutex);
167 return ret;
168 }
169
170 void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
171 {
172 struct proto *proto;
173
174 mutex_lock(&proto_list_mutex);
175 list_for_each_entry_reverse(proto, &proto_list, node)
176 if (proto->destroy_cgroup)
177 proto->destroy_cgroup(memcg);
178 mutex_unlock(&proto_list_mutex);
179 }
180 #endif
181
182 /*
183 * Each address family might have different locking rules, so we have
184 * one slock key per address family:
185 */
186 static struct lock_class_key af_family_keys[AF_MAX];
187 static struct lock_class_key af_family_slock_keys[AF_MAX];
188
189 struct static_key memcg_socket_limit_enabled;
190 EXPORT_SYMBOL(memcg_socket_limit_enabled);
191
192 /*
193 * Make lock validator output more readable. (we pre-construct these
194 * strings build-time, so that runtime initialization of socket
195 * locks is fast):
196 */
197 static const char *const af_family_key_strings[AF_MAX+1] = {
198 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
199 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
200 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
201 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
202 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
203 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
204 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
205 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
206 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
207 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
208 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
209 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
210 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
211 "sk_lock-AF_NFC" , "sk_lock-AF_MAX"
212 };
213 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
214 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
215 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
216 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
217 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
218 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
219 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
220 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
221 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
222 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
223 "slock-27" , "slock-28" , "slock-AF_CAN" ,
224 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
225 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
226 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
227 "slock-AF_NFC" , "slock-AF_MAX"
228 };
229 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
230 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
231 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
232 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
233 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
234 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
235 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
236 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
237 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
238 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
239 "clock-27" , "clock-28" , "clock-AF_CAN" ,
240 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
241 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
242 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
243 "clock-AF_NFC" , "clock-AF_MAX"
244 };
245
246 /*
247 * sk_callback_lock locking rules are per-address-family,
248 * so split the lock classes by using a per-AF key:
249 */
250 static struct lock_class_key af_callback_keys[AF_MAX];
251
252 /* Take into consideration the size of the struct sk_buff overhead in the
253 * determination of these values, since that is non-constant across
254 * platforms. This makes socket queueing behavior and performance
255 * not depend upon such differences.
256 */
257 #define _SK_MEM_PACKETS 256
258 #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
259 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
260 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
261
262 /* Run time adjustable parameters. */
263 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
264 EXPORT_SYMBOL(sysctl_wmem_max);
265 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
266 EXPORT_SYMBOL(sysctl_rmem_max);
267 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
268 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
269
270 /* Maximal space eaten by iovec or ancillary data plus some space */
271 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
272 EXPORT_SYMBOL(sysctl_optmem_max);
273
274 struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
275 EXPORT_SYMBOL_GPL(memalloc_socks);
276
277 /**
278 * sk_set_memalloc - sets %SOCK_MEMALLOC
279 * @sk: socket to set it on
280 *
281 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
282 * It's the responsibility of the admin to adjust min_free_kbytes
283 * to meet the requirements
284 */
285 void sk_set_memalloc(struct sock *sk)
286 {
287 sock_set_flag(sk, SOCK_MEMALLOC);
288 sk->sk_allocation |= __GFP_MEMALLOC;
289 static_key_slow_inc(&memalloc_socks);
290 }
291 EXPORT_SYMBOL_GPL(sk_set_memalloc);
292
293 void sk_clear_memalloc(struct sock *sk)
294 {
295 sock_reset_flag(sk, SOCK_MEMALLOC);
296 sk->sk_allocation &= ~__GFP_MEMALLOC;
297 static_key_slow_dec(&memalloc_socks);
298
299 /*
300 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
301 * progress of swapping. However, if SOCK_MEMALLOC is cleared while
302 * it has rmem allocations there is a risk that the user of the
303 * socket cannot make forward progress due to exceeding the rmem
304 * limits. By rights, sk_clear_memalloc() should only be called
305 * on sockets being torn down but warn and reset the accounting if
306 * that assumption breaks.
307 */
308 if (WARN_ON(sk->sk_forward_alloc))
309 sk_mem_reclaim(sk);
310 }
311 EXPORT_SYMBOL_GPL(sk_clear_memalloc);
312
313 int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
314 {
315 int ret;
316 unsigned long pflags = current->flags;
317
318 /* these should have been dropped before queueing */
319 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
320
321 current->flags |= PF_MEMALLOC;
322 ret = sk->sk_backlog_rcv(sk, skb);
323 tsk_restore_flags(current, pflags, PF_MEMALLOC);
324
325 return ret;
326 }
327 EXPORT_SYMBOL(__sk_backlog_rcv);
328
329 #if defined(CONFIG_CGROUPS)
330 #if !defined(CONFIG_NET_CLS_CGROUP)
331 int net_cls_subsys_id = -1;
332 EXPORT_SYMBOL_GPL(net_cls_subsys_id);
333 #endif
334 #if !defined(CONFIG_NETPRIO_CGROUP)
335 int net_prio_subsys_id = -1;
336 EXPORT_SYMBOL_GPL(net_prio_subsys_id);
337 #endif
338 #endif
339
340 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
341 {
342 struct timeval tv;
343
344 if (optlen < sizeof(tv))
345 return -EINVAL;
346 if (copy_from_user(&tv, optval, sizeof(tv)))
347 return -EFAULT;
348 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
349 return -EDOM;
350
351 if (tv.tv_sec < 0) {
352 static int warned __read_mostly;
353
354 *timeo_p = 0;
355 if (warned < 10 && net_ratelimit()) {
356 warned++;
357 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
358 __func__, current->comm, task_pid_nr(current));
359 }
360 return 0;
361 }
362 *timeo_p = MAX_SCHEDULE_TIMEOUT;
363 if (tv.tv_sec == 0 && tv.tv_usec == 0)
364 return 0;
365 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
366 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
367 return 0;
368 }
369
370 static void sock_warn_obsolete_bsdism(const char *name)
371 {
372 static int warned;
373 static char warncomm[TASK_COMM_LEN];
374 if (strcmp(warncomm, current->comm) && warned < 5) {
375 strcpy(warncomm, current->comm);
376 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
377 warncomm, name);
378 warned++;
379 }
380 }
381
382 #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
383
384 static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
385 {
386 if (sk->sk_flags & flags) {
387 sk->sk_flags &= ~flags;
388 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
389 net_disable_timestamp();
390 }
391 }
392
393
394 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
395 {
396 int err;
397 int skb_len;
398 unsigned long flags;
399 struct sk_buff_head *list = &sk->sk_receive_queue;
400
401 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
402 atomic_inc(&sk->sk_drops);
403 trace_sock_rcvqueue_full(sk, skb);
404 return -ENOMEM;
405 }
406
407 err = sk_filter(sk, skb);
408 if (err)
409 return err;
410
411 if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
412 atomic_inc(&sk->sk_drops);
413 return -ENOBUFS;
414 }
415
416 skb->dev = NULL;
417 skb_set_owner_r(skb, sk);
418
419 /* Cache the SKB length before we tack it onto the receive
420 * queue. Once it is added it no longer belongs to us and
421 * may be freed by other threads of control pulling packets
422 * from the queue.
423 */
424 skb_len = skb->len;
425
426 /* we escape from rcu protected region, make sure we dont leak
427 * a norefcounted dst
428 */
429 skb_dst_force(skb);
430
431 spin_lock_irqsave(&list->lock, flags);
432 skb->dropcount = atomic_read(&sk->sk_drops);
433 __skb_queue_tail(list, skb);
434 spin_unlock_irqrestore(&list->lock, flags);
435
436 if (!sock_flag(sk, SOCK_DEAD))
437 sk->sk_data_ready(sk, skb_len);
438 return 0;
439 }
440 EXPORT_SYMBOL(sock_queue_rcv_skb);
441
442 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
443 {
444 int rc = NET_RX_SUCCESS;
445
446 if (sk_filter(sk, skb))
447 goto discard_and_relse;
448
449 skb->dev = NULL;
450
451 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
452 atomic_inc(&sk->sk_drops);
453 goto discard_and_relse;
454 }
455 if (nested)
456 bh_lock_sock_nested(sk);
457 else
458 bh_lock_sock(sk);
459 if (!sock_owned_by_user(sk)) {
460 /*
461 * trylock + unlock semantics:
462 */
463 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
464
465 rc = sk_backlog_rcv(sk, skb);
466
467 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
468 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
469 bh_unlock_sock(sk);
470 atomic_inc(&sk->sk_drops);
471 goto discard_and_relse;
472 }
473
474 bh_unlock_sock(sk);
475 out:
476 sock_put(sk);
477 return rc;
478 discard_and_relse:
479 kfree_skb(skb);
480 goto out;
481 }
482 EXPORT_SYMBOL(sk_receive_skb);
483
484 void sk_reset_txq(struct sock *sk)
485 {
486 sk_tx_queue_clear(sk);
487 }
488 EXPORT_SYMBOL(sk_reset_txq);
489
490 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
491 {
492 struct dst_entry *dst = __sk_dst_get(sk);
493
494 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
495 sk_tx_queue_clear(sk);
496 RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
497 dst_release(dst);
498 return NULL;
499 }
500
501 return dst;
502 }
503 EXPORT_SYMBOL(__sk_dst_check);
504
505 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
506 {
507 struct dst_entry *dst = sk_dst_get(sk);
508
509 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
510 sk_dst_reset(sk);
511 dst_release(dst);
512 return NULL;
513 }
514
515 return dst;
516 }
517 EXPORT_SYMBOL(sk_dst_check);
518
519 static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
520 {
521 int ret = -ENOPROTOOPT;
522 #ifdef CONFIG_NETDEVICES
523 struct net *net = sock_net(sk);
524 char devname[IFNAMSIZ];
525 int index;
526
527 /* Sorry... */
528 ret = -EPERM;
529 if (!capable(CAP_NET_RAW))
530 goto out;
531
532 ret = -EINVAL;
533 if (optlen < 0)
534 goto out;
535
536 /* Bind this socket to a particular device like "eth0",
537 * as specified in the passed interface name. If the
538 * name is "" or the option length is zero the socket
539 * is not bound.
540 */
541 if (optlen > IFNAMSIZ - 1)
542 optlen = IFNAMSIZ - 1;
543 memset(devname, 0, sizeof(devname));
544
545 ret = -EFAULT;
546 if (copy_from_user(devname, optval, optlen))
547 goto out;
548
549 index = 0;
550 if (devname[0] != '\0') {
551 struct net_device *dev;
552
553 rcu_read_lock();
554 dev = dev_get_by_name_rcu(net, devname);
555 if (dev)
556 index = dev->ifindex;
557 rcu_read_unlock();
558 ret = -ENODEV;
559 if (!dev)
560 goto out;
561 }
562
563 lock_sock(sk);
564 sk->sk_bound_dev_if = index;
565 sk_dst_reset(sk);
566 release_sock(sk);
567
568 ret = 0;
569
570 out:
571 #endif
572
573 return ret;
574 }
575
576 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
577 {
578 if (valbool)
579 sock_set_flag(sk, bit);
580 else
581 sock_reset_flag(sk, bit);
582 }
583
584 /*
585 * This is meant for all protocols to use and covers goings on
586 * at the socket level. Everything here is generic.
587 */
588
589 int sock_setsockopt(struct socket *sock, int level, int optname,
590 char __user *optval, unsigned int optlen)
591 {
592 struct sock *sk = sock->sk;
593 int val;
594 int valbool;
595 struct linger ling;
596 int ret = 0;
597
598 /*
599 * Options without arguments
600 */
601
602 if (optname == SO_BINDTODEVICE)
603 return sock_bindtodevice(sk, optval, optlen);
604
605 if (optlen < sizeof(int))
606 return -EINVAL;
607
608 if (get_user(val, (int __user *)optval))
609 return -EFAULT;
610
611 valbool = val ? 1 : 0;
612
613 lock_sock(sk);
614
615 switch (optname) {
616 case SO_DEBUG:
617 if (val && !capable(CAP_NET_ADMIN))
618 ret = -EACCES;
619 else
620 sock_valbool_flag(sk, SOCK_DBG, valbool);
621 break;
622 case SO_REUSEADDR:
623 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
624 break;
625 case SO_TYPE:
626 case SO_PROTOCOL:
627 case SO_DOMAIN:
628 case SO_ERROR:
629 ret = -ENOPROTOOPT;
630 break;
631 case SO_DONTROUTE:
632 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
633 break;
634 case SO_BROADCAST:
635 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
636 break;
637 case SO_SNDBUF:
638 /* Don't error on this BSD doesn't and if you think
639 * about it this is right. Otherwise apps have to
640 * play 'guess the biggest size' games. RCVBUF/SNDBUF
641 * are treated in BSD as hints
642 */
643 val = min_t(u32, val, sysctl_wmem_max);
644 set_sndbuf:
645 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
646 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF);
647 /* Wake up sending tasks if we upped the value. */
648 sk->sk_write_space(sk);
649 break;
650
651 case SO_SNDBUFFORCE:
652 if (!capable(CAP_NET_ADMIN)) {
653 ret = -EPERM;
654 break;
655 }
656 goto set_sndbuf;
657
658 case SO_RCVBUF:
659 /* Don't error on this BSD doesn't and if you think
660 * about it this is right. Otherwise apps have to
661 * play 'guess the biggest size' games. RCVBUF/SNDBUF
662 * are treated in BSD as hints
663 */
664 val = min_t(u32, val, sysctl_rmem_max);
665 set_rcvbuf:
666 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
667 /*
668 * We double it on the way in to account for
669 * "struct sk_buff" etc. overhead. Applications
670 * assume that the SO_RCVBUF setting they make will
671 * allow that much actual data to be received on that
672 * socket.
673 *
674 * Applications are unaware that "struct sk_buff" and
675 * other overheads allocate from the receive buffer
676 * during socket buffer allocation.
677 *
678 * And after considering the possible alternatives,
679 * returning the value we actually used in getsockopt
680 * is the most desirable behavior.
681 */
682 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF);
683 break;
684
685 case SO_RCVBUFFORCE:
686 if (!capable(CAP_NET_ADMIN)) {
687 ret = -EPERM;
688 break;
689 }
690 goto set_rcvbuf;
691
692 case SO_KEEPALIVE:
693 #ifdef CONFIG_INET
694 if (sk->sk_protocol == IPPROTO_TCP &&
695 sk->sk_type == SOCK_STREAM)
696 tcp_set_keepalive(sk, valbool);
697 #endif
698 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
699 break;
700
701 case SO_OOBINLINE:
702 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
703 break;
704
705 case SO_NO_CHECK:
706 sk->sk_no_check = valbool;
707 break;
708
709 case SO_PRIORITY:
710 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
711 sk->sk_priority = val;
712 else
713 ret = -EPERM;
714 break;
715
716 case SO_LINGER:
717 if (optlen < sizeof(ling)) {
718 ret = -EINVAL; /* 1003.1g */
719 break;
720 }
721 if (copy_from_user(&ling, optval, sizeof(ling))) {
722 ret = -EFAULT;
723 break;
724 }
725 if (!ling.l_onoff)
726 sock_reset_flag(sk, SOCK_LINGER);
727 else {
728 #if (BITS_PER_LONG == 32)
729 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
730 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
731 else
732 #endif
733 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
734 sock_set_flag(sk, SOCK_LINGER);
735 }
736 break;
737
738 case SO_BSDCOMPAT:
739 sock_warn_obsolete_bsdism("setsockopt");
740 break;
741
742 case SO_PASSCRED:
743 if (valbool)
744 set_bit(SOCK_PASSCRED, &sock->flags);
745 else
746 clear_bit(SOCK_PASSCRED, &sock->flags);
747 break;
748
749 case SO_TIMESTAMP:
750 case SO_TIMESTAMPNS:
751 if (valbool) {
752 if (optname == SO_TIMESTAMP)
753 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
754 else
755 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
756 sock_set_flag(sk, SOCK_RCVTSTAMP);
757 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
758 } else {
759 sock_reset_flag(sk, SOCK_RCVTSTAMP);
760 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
761 }
762 break;
763
764 case SO_TIMESTAMPING:
765 if (val & ~SOF_TIMESTAMPING_MASK) {
766 ret = -EINVAL;
767 break;
768 }
769 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
770 val & SOF_TIMESTAMPING_TX_HARDWARE);
771 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
772 val & SOF_TIMESTAMPING_TX_SOFTWARE);
773 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
774 val & SOF_TIMESTAMPING_RX_HARDWARE);
775 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
776 sock_enable_timestamp(sk,
777 SOCK_TIMESTAMPING_RX_SOFTWARE);
778 else
779 sock_disable_timestamp(sk,
780 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
781 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
782 val & SOF_TIMESTAMPING_SOFTWARE);
783 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
784 val & SOF_TIMESTAMPING_SYS_HARDWARE);
785 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
786 val & SOF_TIMESTAMPING_RAW_HARDWARE);
787 break;
788
789 case SO_RCVLOWAT:
790 if (val < 0)
791 val = INT_MAX;
792 sk->sk_rcvlowat = val ? : 1;
793 break;
794
795 case SO_RCVTIMEO:
796 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
797 break;
798
799 case SO_SNDTIMEO:
800 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
801 break;
802
803 case SO_ATTACH_FILTER:
804 ret = -EINVAL;
805 if (optlen == sizeof(struct sock_fprog)) {
806 struct sock_fprog fprog;
807
808 ret = -EFAULT;
809 if (copy_from_user(&fprog, optval, sizeof(fprog)))
810 break;
811
812 ret = sk_attach_filter(&fprog, sk);
813 }
814 break;
815
816 case SO_DETACH_FILTER:
817 ret = sk_detach_filter(sk);
818 break;
819
820 case SO_PASSSEC:
821 if (valbool)
822 set_bit(SOCK_PASSSEC, &sock->flags);
823 else
824 clear_bit(SOCK_PASSSEC, &sock->flags);
825 break;
826 case SO_MARK:
827 if (!capable(CAP_NET_ADMIN))
828 ret = -EPERM;
829 else
830 sk->sk_mark = val;
831 break;
832
833 /* We implement the SO_SNDLOWAT etc to
834 not be settable (1003.1g 5.3) */
835 case SO_RXQ_OVFL:
836 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
837 break;
838
839 case SO_WIFI_STATUS:
840 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
841 break;
842
843 case SO_PEEK_OFF:
844 if (sock->ops->set_peek_off)
845 sock->ops->set_peek_off(sk, val);
846 else
847 ret = -EOPNOTSUPP;
848 break;
849
850 case SO_NOFCS:
851 sock_valbool_flag(sk, SOCK_NOFCS, valbool);
852 break;
853
854 default:
855 ret = -ENOPROTOOPT;
856 break;
857 }
858 release_sock(sk);
859 return ret;
860 }
861 EXPORT_SYMBOL(sock_setsockopt);
862
863
864 void cred_to_ucred(struct pid *pid, const struct cred *cred,
865 struct ucred *ucred)
866 {
867 ucred->pid = pid_vnr(pid);
868 ucred->uid = ucred->gid = -1;
869 if (cred) {
870 struct user_namespace *current_ns = current_user_ns();
871
872 ucred->uid = from_kuid_munged(current_ns, cred->euid);
873 ucred->gid = from_kgid_munged(current_ns, cred->egid);
874 }
875 }
876 EXPORT_SYMBOL_GPL(cred_to_ucred);
877
878 int sock_getsockopt(struct socket *sock, int level, int optname,
879 char __user *optval, int __user *optlen)
880 {
881 struct sock *sk = sock->sk;
882
883 union {
884 int val;
885 struct linger ling;
886 struct timeval tm;
887 } v;
888
889 int lv = sizeof(int);
890 int len;
891
892 if (get_user(len, optlen))
893 return -EFAULT;
894 if (len < 0)
895 return -EINVAL;
896
897 memset(&v, 0, sizeof(v));
898
899 switch (optname) {
900 case SO_DEBUG:
901 v.val = sock_flag(sk, SOCK_DBG);
902 break;
903
904 case SO_DONTROUTE:
905 v.val = sock_flag(sk, SOCK_LOCALROUTE);
906 break;
907
908 case SO_BROADCAST:
909 v.val = sock_flag(sk, SOCK_BROADCAST);
910 break;
911
912 case SO_SNDBUF:
913 v.val = sk->sk_sndbuf;
914 break;
915
916 case SO_RCVBUF:
917 v.val = sk->sk_rcvbuf;
918 break;
919
920 case SO_REUSEADDR:
921 v.val = sk->sk_reuse;
922 break;
923
924 case SO_KEEPALIVE:
925 v.val = sock_flag(sk, SOCK_KEEPOPEN);
926 break;
927
928 case SO_TYPE:
929 v.val = sk->sk_type;
930 break;
931
932 case SO_PROTOCOL:
933 v.val = sk->sk_protocol;
934 break;
935
936 case SO_DOMAIN:
937 v.val = sk->sk_family;
938 break;
939
940 case SO_ERROR:
941 v.val = -sock_error(sk);
942 if (v.val == 0)
943 v.val = xchg(&sk->sk_err_soft, 0);
944 break;
945
946 case SO_OOBINLINE:
947 v.val = sock_flag(sk, SOCK_URGINLINE);
948 break;
949
950 case SO_NO_CHECK:
951 v.val = sk->sk_no_check;
952 break;
953
954 case SO_PRIORITY:
955 v.val = sk->sk_priority;
956 break;
957
958 case SO_LINGER:
959 lv = sizeof(v.ling);
960 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
961 v.ling.l_linger = sk->sk_lingertime / HZ;
962 break;
963
964 case SO_BSDCOMPAT:
965 sock_warn_obsolete_bsdism("getsockopt");
966 break;
967
968 case SO_TIMESTAMP:
969 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
970 !sock_flag(sk, SOCK_RCVTSTAMPNS);
971 break;
972
973 case SO_TIMESTAMPNS:
974 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
975 break;
976
977 case SO_TIMESTAMPING:
978 v.val = 0;
979 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
980 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
981 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
982 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
983 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
984 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
985 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
986 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
987 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
988 v.val |= SOF_TIMESTAMPING_SOFTWARE;
989 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
990 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
991 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
992 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
993 break;
994
995 case SO_RCVTIMEO:
996 lv = sizeof(struct timeval);
997 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
998 v.tm.tv_sec = 0;
999 v.tm.tv_usec = 0;
1000 } else {
1001 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
1002 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
1003 }
1004 break;
1005
1006 case SO_SNDTIMEO:
1007 lv = sizeof(struct timeval);
1008 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
1009 v.tm.tv_sec = 0;
1010 v.tm.tv_usec = 0;
1011 } else {
1012 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
1013 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
1014 }
1015 break;
1016
1017 case SO_RCVLOWAT:
1018 v.val = sk->sk_rcvlowat;
1019 break;
1020
1021 case SO_SNDLOWAT:
1022 v.val = 1;
1023 break;
1024
1025 case SO_PASSCRED:
1026 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
1027 break;
1028
1029 case SO_PEERCRED:
1030 {
1031 struct ucred peercred;
1032 if (len > sizeof(peercred))
1033 len = sizeof(peercred);
1034 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
1035 if (copy_to_user(optval, &peercred, len))
1036 return -EFAULT;
1037 goto lenout;
1038 }
1039
1040 case SO_PEERNAME:
1041 {
1042 char address[128];
1043
1044 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
1045 return -ENOTCONN;
1046 if (lv < len)
1047 return -EINVAL;
1048 if (copy_to_user(optval, address, len))
1049 return -EFAULT;
1050 goto lenout;
1051 }
1052
1053 /* Dubious BSD thing... Probably nobody even uses it, but
1054 * the UNIX standard wants it for whatever reason... -DaveM
1055 */
1056 case SO_ACCEPTCONN:
1057 v.val = sk->sk_state == TCP_LISTEN;
1058 break;
1059
1060 case SO_PASSSEC:
1061 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
1062 break;
1063
1064 case SO_PEERSEC:
1065 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1066
1067 case SO_MARK:
1068 v.val = sk->sk_mark;
1069 break;
1070
1071 case SO_RXQ_OVFL:
1072 v.val = sock_flag(sk, SOCK_RXQ_OVFL);
1073 break;
1074
1075 case SO_WIFI_STATUS:
1076 v.val = sock_flag(sk, SOCK_WIFI_STATUS);
1077 break;
1078
1079 case SO_PEEK_OFF:
1080 if (!sock->ops->set_peek_off)
1081 return -EOPNOTSUPP;
1082
1083 v.val = sk->sk_peek_off;
1084 break;
1085 case SO_NOFCS:
1086 v.val = sock_flag(sk, SOCK_NOFCS);
1087 break;
1088 default:
1089 return -ENOPROTOOPT;
1090 }
1091
1092 if (len > lv)
1093 len = lv;
1094 if (copy_to_user(optval, &v, len))
1095 return -EFAULT;
1096 lenout:
1097 if (put_user(len, optlen))
1098 return -EFAULT;
1099 return 0;
1100 }
1101
1102 /*
1103 * Initialize an sk_lock.
1104 *
1105 * (We also register the sk_lock with the lock validator.)
1106 */
1107 static inline void sock_lock_init(struct sock *sk)
1108 {
1109 sock_lock_init_class_and_name(sk,
1110 af_family_slock_key_strings[sk->sk_family],
1111 af_family_slock_keys + sk->sk_family,
1112 af_family_key_strings[sk->sk_family],
1113 af_family_keys + sk->sk_family);
1114 }
1115
1116 /*
1117 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1118 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1119 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1120 */
1121 static void sock_copy(struct sock *nsk, const struct sock *osk)
1122 {
1123 #ifdef CONFIG_SECURITY_NETWORK
1124 void *sptr = nsk->sk_security;
1125 #endif
1126 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
1127
1128 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
1129 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
1130
1131 #ifdef CONFIG_SECURITY_NETWORK
1132 nsk->sk_security = sptr;
1133 security_sk_clone(osk, nsk);
1134 #endif
1135 }
1136
1137 /*
1138 * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
1139 * un-modified. Special care is taken when initializing object to zero.
1140 */
1141 static inline void sk_prot_clear_nulls(struct sock *sk, int size)
1142 {
1143 if (offsetof(struct sock, sk_node.next) != 0)
1144 memset(sk, 0, offsetof(struct sock, sk_node.next));
1145 memset(&sk->sk_node.pprev, 0,
1146 size - offsetof(struct sock, sk_node.pprev));
1147 }
1148
1149 void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
1150 {
1151 unsigned long nulls1, nulls2;
1152
1153 nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
1154 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
1155 if (nulls1 > nulls2)
1156 swap(nulls1, nulls2);
1157
1158 if (nulls1 != 0)
1159 memset((char *)sk, 0, nulls1);
1160 memset((char *)sk + nulls1 + sizeof(void *), 0,
1161 nulls2 - nulls1 - sizeof(void *));
1162 memset((char *)sk + nulls2 + sizeof(void *), 0,
1163 size - nulls2 - sizeof(void *));
1164 }
1165 EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
1166
1167 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1168 int family)
1169 {
1170 struct sock *sk;
1171 struct kmem_cache *slab;
1172
1173 slab = prot->slab;
1174 if (slab != NULL) {
1175 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1176 if (!sk)
1177 return sk;
1178 if (priority & __GFP_ZERO) {
1179 if (prot->clear_sk)
1180 prot->clear_sk(sk, prot->obj_size);
1181 else
1182 sk_prot_clear_nulls(sk, prot->obj_size);
1183 }
1184 } else
1185 sk = kmalloc(prot->obj_size, priority);
1186
1187 if (sk != NULL) {
1188 kmemcheck_annotate_bitfield(sk, flags);
1189
1190 if (security_sk_alloc(sk, family, priority))
1191 goto out_free;
1192
1193 if (!try_module_get(prot->owner))
1194 goto out_free_sec;
1195 sk_tx_queue_clear(sk);
1196 }
1197
1198 return sk;
1199
1200 out_free_sec:
1201 security_sk_free(sk);
1202 out_free:
1203 if (slab != NULL)
1204 kmem_cache_free(slab, sk);
1205 else
1206 kfree(sk);
1207 return NULL;
1208 }
1209
1210 static void sk_prot_free(struct proto *prot, struct sock *sk)
1211 {
1212 struct kmem_cache *slab;
1213 struct module *owner;
1214
1215 owner = prot->owner;
1216 slab = prot->slab;
1217
1218 security_sk_free(sk);
1219 if (slab != NULL)
1220 kmem_cache_free(slab, sk);
1221 else
1222 kfree(sk);
1223 module_put(owner);
1224 }
1225
1226 #ifdef CONFIG_CGROUPS
1227 void sock_update_classid(struct sock *sk)
1228 {
1229 u32 classid;
1230
1231 rcu_read_lock(); /* doing current task, which cannot vanish. */
1232 classid = task_cls_classid(current);
1233 rcu_read_unlock();
1234 if (classid != sk->sk_classid)
1235 sk->sk_classid = classid;
1236 }
1237 EXPORT_SYMBOL(sock_update_classid);
1238
1239 void sock_update_netprioidx(struct sock *sk, struct task_struct *task)
1240 {
1241 if (in_interrupt())
1242 return;
1243
1244 sk->sk_cgrp_prioidx = task_netprioidx(task);
1245 }
1246 EXPORT_SYMBOL_GPL(sock_update_netprioidx);
1247 #endif
1248
1249 /**
1250 * sk_alloc - All socket objects are allocated here
1251 * @net: the applicable net namespace
1252 * @family: protocol family
1253 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1254 * @prot: struct proto associated with this new sock instance
1255 */
1256 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1257 struct proto *prot)
1258 {
1259 struct sock *sk;
1260
1261 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1262 if (sk) {
1263 sk->sk_family = family;
1264 /*
1265 * See comment in struct sock definition to understand
1266 * why we need sk_prot_creator -acme
1267 */
1268 sk->sk_prot = sk->sk_prot_creator = prot;
1269 sock_lock_init(sk);
1270 sock_net_set(sk, get_net(net));
1271 atomic_set(&sk->sk_wmem_alloc, 1);
1272
1273 sock_update_classid(sk);
1274 sock_update_netprioidx(sk, current);
1275 }
1276
1277 return sk;
1278 }
1279 EXPORT_SYMBOL(sk_alloc);
1280
1281 static void __sk_free(struct sock *sk)
1282 {
1283 struct sk_filter *filter;
1284
1285 if (sk->sk_destruct)
1286 sk->sk_destruct(sk);
1287
1288 filter = rcu_dereference_check(sk->sk_filter,
1289 atomic_read(&sk->sk_wmem_alloc) == 0);
1290 if (filter) {
1291 sk_filter_uncharge(sk, filter);
1292 RCU_INIT_POINTER(sk->sk_filter, NULL);
1293 }
1294
1295 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
1296
1297 if (atomic_read(&sk->sk_omem_alloc))
1298 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1299 __func__, atomic_read(&sk->sk_omem_alloc));
1300
1301 if (sk->sk_peer_cred)
1302 put_cred(sk->sk_peer_cred);
1303 put_pid(sk->sk_peer_pid);
1304 put_net(sock_net(sk));
1305 sk_prot_free(sk->sk_prot_creator, sk);
1306 }
1307
1308 void sk_free(struct sock *sk)
1309 {
1310 /*
1311 * We subtract one from sk_wmem_alloc and can know if
1312 * some packets are still in some tx queue.
1313 * If not null, sock_wfree() will call __sk_free(sk) later
1314 */
1315 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1316 __sk_free(sk);
1317 }
1318 EXPORT_SYMBOL(sk_free);
1319
1320 /*
1321 * Last sock_put should drop reference to sk->sk_net. It has already
1322 * been dropped in sk_change_net. Taking reference to stopping namespace
1323 * is not an option.
1324 * Take reference to a socket to remove it from hash _alive_ and after that
1325 * destroy it in the context of init_net.
1326 */
1327 void sk_release_kernel(struct sock *sk)
1328 {
1329 if (sk == NULL || sk->sk_socket == NULL)
1330 return;
1331
1332 sock_hold(sk);
1333 sock_release(sk->sk_socket);
1334 release_net(sock_net(sk));
1335 sock_net_set(sk, get_net(&init_net));
1336 sock_put(sk);
1337 }
1338 EXPORT_SYMBOL(sk_release_kernel);
1339
1340 static void sk_update_clone(const struct sock *sk, struct sock *newsk)
1341 {
1342 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1343 sock_update_memcg(newsk);
1344 }
1345
1346 /**
1347 * sk_clone_lock - clone a socket, and lock its clone
1348 * @sk: the socket to clone
1349 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1350 *
1351 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1352 */
1353 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
1354 {
1355 struct sock *newsk;
1356
1357 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1358 if (newsk != NULL) {
1359 struct sk_filter *filter;
1360
1361 sock_copy(newsk, sk);
1362
1363 /* SANITY */
1364 get_net(sock_net(newsk));
1365 sk_node_init(&newsk->sk_node);
1366 sock_lock_init(newsk);
1367 bh_lock_sock(newsk);
1368 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
1369 newsk->sk_backlog.len = 0;
1370
1371 atomic_set(&newsk->sk_rmem_alloc, 0);
1372 /*
1373 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1374 */
1375 atomic_set(&newsk->sk_wmem_alloc, 1);
1376 atomic_set(&newsk->sk_omem_alloc, 0);
1377 skb_queue_head_init(&newsk->sk_receive_queue);
1378 skb_queue_head_init(&newsk->sk_write_queue);
1379 #ifdef CONFIG_NET_DMA
1380 skb_queue_head_init(&newsk->sk_async_wait_queue);
1381 #endif
1382
1383 spin_lock_init(&newsk->sk_dst_lock);
1384 rwlock_init(&newsk->sk_callback_lock);
1385 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1386 af_callback_keys + newsk->sk_family,
1387 af_family_clock_key_strings[newsk->sk_family]);
1388
1389 newsk->sk_dst_cache = NULL;
1390 newsk->sk_wmem_queued = 0;
1391 newsk->sk_forward_alloc = 0;
1392 newsk->sk_send_head = NULL;
1393 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1394
1395 sock_reset_flag(newsk, SOCK_DONE);
1396 skb_queue_head_init(&newsk->sk_error_queue);
1397
1398 filter = rcu_dereference_protected(newsk->sk_filter, 1);
1399 if (filter != NULL)
1400 sk_filter_charge(newsk, filter);
1401
1402 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1403 /* It is still raw copy of parent, so invalidate
1404 * destructor and make plain sk_free() */
1405 newsk->sk_destruct = NULL;
1406 bh_unlock_sock(newsk);
1407 sk_free(newsk);
1408 newsk = NULL;
1409 goto out;
1410 }
1411
1412 newsk->sk_err = 0;
1413 newsk->sk_priority = 0;
1414 /*
1415 * Before updating sk_refcnt, we must commit prior changes to memory
1416 * (Documentation/RCU/rculist_nulls.txt for details)
1417 */
1418 smp_wmb();
1419 atomic_set(&newsk->sk_refcnt, 2);
1420
1421 /*
1422 * Increment the counter in the same struct proto as the master
1423 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1424 * is the same as sk->sk_prot->socks, as this field was copied
1425 * with memcpy).
1426 *
1427 * This _changes_ the previous behaviour, where
1428 * tcp_create_openreq_child always was incrementing the
1429 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1430 * to be taken into account in all callers. -acme
1431 */
1432 sk_refcnt_debug_inc(newsk);
1433 sk_set_socket(newsk, NULL);
1434 newsk->sk_wq = NULL;
1435
1436 sk_update_clone(sk, newsk);
1437
1438 if (newsk->sk_prot->sockets_allocated)
1439 sk_sockets_allocated_inc(newsk);
1440
1441 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
1442 net_enable_timestamp();
1443 }
1444 out:
1445 return newsk;
1446 }
1447 EXPORT_SYMBOL_GPL(sk_clone_lock);
1448
1449 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1450 {
1451 __sk_dst_set(sk, dst);
1452 sk->sk_route_caps = dst->dev->features;
1453 if (sk->sk_route_caps & NETIF_F_GSO)
1454 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1455 sk->sk_route_caps &= ~sk->sk_route_nocaps;
1456 if (sk_can_gso(sk)) {
1457 if (dst->header_len) {
1458 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1459 } else {
1460 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1461 sk->sk_gso_max_size = dst->dev->gso_max_size;
1462 sk->sk_gso_max_segs = dst->dev->gso_max_segs;
1463 }
1464 }
1465 }
1466 EXPORT_SYMBOL_GPL(sk_setup_caps);
1467
1468 /*
1469 * Simple resource managers for sockets.
1470 */
1471
1472
1473 /*
1474 * Write buffer destructor automatically called from kfree_skb.
1475 */
1476 void sock_wfree(struct sk_buff *skb)
1477 {
1478 struct sock *sk = skb->sk;
1479 unsigned int len = skb->truesize;
1480
1481 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1482 /*
1483 * Keep a reference on sk_wmem_alloc, this will be released
1484 * after sk_write_space() call
1485 */
1486 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1487 sk->sk_write_space(sk);
1488 len = 1;
1489 }
1490 /*
1491 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1492 * could not do because of in-flight packets
1493 */
1494 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1495 __sk_free(sk);
1496 }
1497 EXPORT_SYMBOL(sock_wfree);
1498
1499 /*
1500 * Read buffer destructor automatically called from kfree_skb.
1501 */
1502 void sock_rfree(struct sk_buff *skb)
1503 {
1504 struct sock *sk = skb->sk;
1505 unsigned int len = skb->truesize;
1506
1507 atomic_sub(len, &sk->sk_rmem_alloc);
1508 sk_mem_uncharge(sk, len);
1509 }
1510 EXPORT_SYMBOL(sock_rfree);
1511
1512 void sock_edemux(struct sk_buff *skb)
1513 {
1514 struct sock *sk = skb->sk;
1515
1516 #ifdef CONFIG_INET
1517 if (sk->sk_state == TCP_TIME_WAIT)
1518 inet_twsk_put(inet_twsk(sk));
1519 else
1520 #endif
1521 sock_put(sk);
1522 }
1523 EXPORT_SYMBOL(sock_edemux);
1524
1525 kuid_t sock_i_uid(struct sock *sk)
1526 {
1527 kuid_t uid;
1528
1529 read_lock_bh(&sk->sk_callback_lock);
1530 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
1531 read_unlock_bh(&sk->sk_callback_lock);
1532 return uid;
1533 }
1534 EXPORT_SYMBOL(sock_i_uid);
1535
1536 unsigned long sock_i_ino(struct sock *sk)
1537 {
1538 unsigned long ino;
1539
1540 read_lock_bh(&sk->sk_callback_lock);
1541 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1542 read_unlock_bh(&sk->sk_callback_lock);
1543 return ino;
1544 }
1545 EXPORT_SYMBOL(sock_i_ino);
1546
1547 /*
1548 * Allocate a skb from the socket's send buffer.
1549 */
1550 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1551 gfp_t priority)
1552 {
1553 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1554 struct sk_buff *skb = alloc_skb(size, priority);
1555 if (skb) {
1556 skb_set_owner_w(skb, sk);
1557 return skb;
1558 }
1559 }
1560 return NULL;
1561 }
1562 EXPORT_SYMBOL(sock_wmalloc);
1563
1564 /*
1565 * Allocate a skb from the socket's receive buffer.
1566 */
1567 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1568 gfp_t priority)
1569 {
1570 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1571 struct sk_buff *skb = alloc_skb(size, priority);
1572 if (skb) {
1573 skb_set_owner_r(skb, sk);
1574 return skb;
1575 }
1576 }
1577 return NULL;
1578 }
1579
1580 /*
1581 * Allocate a memory block from the socket's option memory buffer.
1582 */
1583 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1584 {
1585 if ((unsigned int)size <= sysctl_optmem_max &&
1586 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1587 void *mem;
1588 /* First do the add, to avoid the race if kmalloc
1589 * might sleep.
1590 */
1591 atomic_add(size, &sk->sk_omem_alloc);
1592 mem = kmalloc(size, priority);
1593 if (mem)
1594 return mem;
1595 atomic_sub(size, &sk->sk_omem_alloc);
1596 }
1597 return NULL;
1598 }
1599 EXPORT_SYMBOL(sock_kmalloc);
1600
1601 /*
1602 * Free an option memory block.
1603 */
1604 void sock_kfree_s(struct sock *sk, void *mem, int size)
1605 {
1606 kfree(mem);
1607 atomic_sub(size, &sk->sk_omem_alloc);
1608 }
1609 EXPORT_SYMBOL(sock_kfree_s);
1610
1611 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1612 I think, these locks should be removed for datagram sockets.
1613 */
1614 static long sock_wait_for_wmem(struct sock *sk, long timeo)
1615 {
1616 DEFINE_WAIT(wait);
1617
1618 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1619 for (;;) {
1620 if (!timeo)
1621 break;
1622 if (signal_pending(current))
1623 break;
1624 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1625 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1626 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1627 break;
1628 if (sk->sk_shutdown & SEND_SHUTDOWN)
1629 break;
1630 if (sk->sk_err)
1631 break;
1632 timeo = schedule_timeout(timeo);
1633 }
1634 finish_wait(sk_sleep(sk), &wait);
1635 return timeo;
1636 }
1637
1638
1639 /*
1640 * Generic send/receive buffer handlers
1641 */
1642
1643 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1644 unsigned long data_len, int noblock,
1645 int *errcode)
1646 {
1647 struct sk_buff *skb;
1648 gfp_t gfp_mask;
1649 long timeo;
1650 int err;
1651 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1652
1653 err = -EMSGSIZE;
1654 if (npages > MAX_SKB_FRAGS)
1655 goto failure;
1656
1657 gfp_mask = sk->sk_allocation;
1658 if (gfp_mask & __GFP_WAIT)
1659 gfp_mask |= __GFP_REPEAT;
1660
1661 timeo = sock_sndtimeo(sk, noblock);
1662 while (1) {
1663 err = sock_error(sk);
1664 if (err != 0)
1665 goto failure;
1666
1667 err = -EPIPE;
1668 if (sk->sk_shutdown & SEND_SHUTDOWN)
1669 goto failure;
1670
1671 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1672 skb = alloc_skb(header_len, gfp_mask);
1673 if (skb) {
1674 int i;
1675
1676 /* No pages, we're done... */
1677 if (!data_len)
1678 break;
1679
1680 skb->truesize += data_len;
1681 skb_shinfo(skb)->nr_frags = npages;
1682 for (i = 0; i < npages; i++) {
1683 struct page *page;
1684
1685 page = alloc_pages(sk->sk_allocation, 0);
1686 if (!page) {
1687 err = -ENOBUFS;
1688 skb_shinfo(skb)->nr_frags = i;
1689 kfree_skb(skb);
1690 goto failure;
1691 }
1692
1693 __skb_fill_page_desc(skb, i,
1694 page, 0,
1695 (data_len >= PAGE_SIZE ?
1696 PAGE_SIZE :
1697 data_len));
1698 data_len -= PAGE_SIZE;
1699 }
1700
1701 /* Full success... */
1702 break;
1703 }
1704 err = -ENOBUFS;
1705 goto failure;
1706 }
1707 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1708 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1709 err = -EAGAIN;
1710 if (!timeo)
1711 goto failure;
1712 if (signal_pending(current))
1713 goto interrupted;
1714 timeo = sock_wait_for_wmem(sk, timeo);
1715 }
1716
1717 skb_set_owner_w(skb, sk);
1718 return skb;
1719
1720 interrupted:
1721 err = sock_intr_errno(timeo);
1722 failure:
1723 *errcode = err;
1724 return NULL;
1725 }
1726 EXPORT_SYMBOL(sock_alloc_send_pskb);
1727
1728 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1729 int noblock, int *errcode)
1730 {
1731 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1732 }
1733 EXPORT_SYMBOL(sock_alloc_send_skb);
1734
1735 /* On 32bit arches, an skb frag is limited to 2^15 */
1736 #define SKB_FRAG_PAGE_ORDER get_order(32768)
1737
1738 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
1739 {
1740 int order;
1741
1742 if (pfrag->page) {
1743 if (atomic_read(&pfrag->page->_count) == 1) {
1744 pfrag->offset = 0;
1745 return true;
1746 }
1747 if (pfrag->offset < pfrag->size)
1748 return true;
1749 put_page(pfrag->page);
1750 }
1751
1752 /* We restrict high order allocations to users that can afford to wait */
1753 order = (sk->sk_allocation & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0;
1754
1755 do {
1756 gfp_t gfp = sk->sk_allocation;
1757
1758 if (order)
1759 gfp |= __GFP_COMP | __GFP_NOWARN;
1760 pfrag->page = alloc_pages(gfp, order);
1761 if (likely(pfrag->page)) {
1762 pfrag->offset = 0;
1763 pfrag->size = PAGE_SIZE << order;
1764 return true;
1765 }
1766 } while (--order >= 0);
1767
1768 sk_enter_memory_pressure(sk);
1769 sk_stream_moderate_sndbuf(sk);
1770 return false;
1771 }
1772 EXPORT_SYMBOL(sk_page_frag_refill);
1773
1774 static void __lock_sock(struct sock *sk)
1775 __releases(&sk->sk_lock.slock)
1776 __acquires(&sk->sk_lock.slock)
1777 {
1778 DEFINE_WAIT(wait);
1779
1780 for (;;) {
1781 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1782 TASK_UNINTERRUPTIBLE);
1783 spin_unlock_bh(&sk->sk_lock.slock);
1784 schedule();
1785 spin_lock_bh(&sk->sk_lock.slock);
1786 if (!sock_owned_by_user(sk))
1787 break;
1788 }
1789 finish_wait(&sk->sk_lock.wq, &wait);
1790 }
1791
1792 static void __release_sock(struct sock *sk)
1793 __releases(&sk->sk_lock.slock)
1794 __acquires(&sk->sk_lock.slock)
1795 {
1796 struct sk_buff *skb = sk->sk_backlog.head;
1797
1798 do {
1799 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1800 bh_unlock_sock(sk);
1801
1802 do {
1803 struct sk_buff *next = skb->next;
1804
1805 prefetch(next);
1806 WARN_ON_ONCE(skb_dst_is_noref(skb));
1807 skb->next = NULL;
1808 sk_backlog_rcv(sk, skb);
1809
1810 /*
1811 * We are in process context here with softirqs
1812 * disabled, use cond_resched_softirq() to preempt.
1813 * This is safe to do because we've taken the backlog
1814 * queue private:
1815 */
1816 cond_resched_softirq();
1817
1818 skb = next;
1819 } while (skb != NULL);
1820
1821 bh_lock_sock(sk);
1822 } while ((skb = sk->sk_backlog.head) != NULL);
1823
1824 /*
1825 * Doing the zeroing here guarantee we can not loop forever
1826 * while a wild producer attempts to flood us.
1827 */
1828 sk->sk_backlog.len = 0;
1829 }
1830
1831 /**
1832 * sk_wait_data - wait for data to arrive at sk_receive_queue
1833 * @sk: sock to wait on
1834 * @timeo: for how long
1835 *
1836 * Now socket state including sk->sk_err is changed only under lock,
1837 * hence we may omit checks after joining wait queue.
1838 * We check receive queue before schedule() only as optimization;
1839 * it is very likely that release_sock() added new data.
1840 */
1841 int sk_wait_data(struct sock *sk, long *timeo)
1842 {
1843 int rc;
1844 DEFINE_WAIT(wait);
1845
1846 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1847 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1848 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1849 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1850 finish_wait(sk_sleep(sk), &wait);
1851 return rc;
1852 }
1853 EXPORT_SYMBOL(sk_wait_data);
1854
1855 /**
1856 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1857 * @sk: socket
1858 * @size: memory size to allocate
1859 * @kind: allocation type
1860 *
1861 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1862 * rmem allocation. This function assumes that protocols which have
1863 * memory_pressure use sk_wmem_queued as write buffer accounting.
1864 */
1865 int __sk_mem_schedule(struct sock *sk, int size, int kind)
1866 {
1867 struct proto *prot = sk->sk_prot;
1868 int amt = sk_mem_pages(size);
1869 long allocated;
1870 int parent_status = UNDER_LIMIT;
1871
1872 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1873
1874 allocated = sk_memory_allocated_add(sk, amt, &parent_status);
1875
1876 /* Under limit. */
1877 if (parent_status == UNDER_LIMIT &&
1878 allocated <= sk_prot_mem_limits(sk, 0)) {
1879 sk_leave_memory_pressure(sk);
1880 return 1;
1881 }
1882
1883 /* Under pressure. (we or our parents) */
1884 if ((parent_status > SOFT_LIMIT) ||
1885 allocated > sk_prot_mem_limits(sk, 1))
1886 sk_enter_memory_pressure(sk);
1887
1888 /* Over hard limit (we or our parents) */
1889 if ((parent_status == OVER_LIMIT) ||
1890 (allocated > sk_prot_mem_limits(sk, 2)))
1891 goto suppress_allocation;
1892
1893 /* guarantee minimum buffer size under pressure */
1894 if (kind == SK_MEM_RECV) {
1895 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1896 return 1;
1897
1898 } else { /* SK_MEM_SEND */
1899 if (sk->sk_type == SOCK_STREAM) {
1900 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1901 return 1;
1902 } else if (atomic_read(&sk->sk_wmem_alloc) <
1903 prot->sysctl_wmem[0])
1904 return 1;
1905 }
1906
1907 if (sk_has_memory_pressure(sk)) {
1908 int alloc;
1909
1910 if (!sk_under_memory_pressure(sk))
1911 return 1;
1912 alloc = sk_sockets_allocated_read_positive(sk);
1913 if (sk_prot_mem_limits(sk, 2) > alloc *
1914 sk_mem_pages(sk->sk_wmem_queued +
1915 atomic_read(&sk->sk_rmem_alloc) +
1916 sk->sk_forward_alloc))
1917 return 1;
1918 }
1919
1920 suppress_allocation:
1921
1922 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1923 sk_stream_moderate_sndbuf(sk);
1924
1925 /* Fail only if socket is _under_ its sndbuf.
1926 * In this case we cannot block, so that we have to fail.
1927 */
1928 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1929 return 1;
1930 }
1931
1932 trace_sock_exceed_buf_limit(sk, prot, allocated);
1933
1934 /* Alas. Undo changes. */
1935 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1936
1937 sk_memory_allocated_sub(sk, amt);
1938
1939 return 0;
1940 }
1941 EXPORT_SYMBOL(__sk_mem_schedule);
1942
1943 /**
1944 * __sk_reclaim - reclaim memory_allocated
1945 * @sk: socket
1946 */
1947 void __sk_mem_reclaim(struct sock *sk)
1948 {
1949 sk_memory_allocated_sub(sk,
1950 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
1951 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1952
1953 if (sk_under_memory_pressure(sk) &&
1954 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
1955 sk_leave_memory_pressure(sk);
1956 }
1957 EXPORT_SYMBOL(__sk_mem_reclaim);
1958
1959
1960 /*
1961 * Set of default routines for initialising struct proto_ops when
1962 * the protocol does not support a particular function. In certain
1963 * cases where it makes no sense for a protocol to have a "do nothing"
1964 * function, some default processing is provided.
1965 */
1966
1967 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1968 {
1969 return -EOPNOTSUPP;
1970 }
1971 EXPORT_SYMBOL(sock_no_bind);
1972
1973 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1974 int len, int flags)
1975 {
1976 return -EOPNOTSUPP;
1977 }
1978 EXPORT_SYMBOL(sock_no_connect);
1979
1980 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1981 {
1982 return -EOPNOTSUPP;
1983 }
1984 EXPORT_SYMBOL(sock_no_socketpair);
1985
1986 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1987 {
1988 return -EOPNOTSUPP;
1989 }
1990 EXPORT_SYMBOL(sock_no_accept);
1991
1992 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1993 int *len, int peer)
1994 {
1995 return -EOPNOTSUPP;
1996 }
1997 EXPORT_SYMBOL(sock_no_getname);
1998
1999 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
2000 {
2001 return 0;
2002 }
2003 EXPORT_SYMBOL(sock_no_poll);
2004
2005 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2006 {
2007 return -EOPNOTSUPP;
2008 }
2009 EXPORT_SYMBOL(sock_no_ioctl);
2010
2011 int sock_no_listen(struct socket *sock, int backlog)
2012 {
2013 return -EOPNOTSUPP;
2014 }
2015 EXPORT_SYMBOL(sock_no_listen);
2016
2017 int sock_no_shutdown(struct socket *sock, int how)
2018 {
2019 return -EOPNOTSUPP;
2020 }
2021 EXPORT_SYMBOL(sock_no_shutdown);
2022
2023 int sock_no_setsockopt(struct socket *sock, int level, int optname,
2024 char __user *optval, unsigned int optlen)
2025 {
2026 return -EOPNOTSUPP;
2027 }
2028 EXPORT_SYMBOL(sock_no_setsockopt);
2029
2030 int sock_no_getsockopt(struct socket *sock, int level, int optname,
2031 char __user *optval, int __user *optlen)
2032 {
2033 return -EOPNOTSUPP;
2034 }
2035 EXPORT_SYMBOL(sock_no_getsockopt);
2036
2037 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2038 size_t len)
2039 {
2040 return -EOPNOTSUPP;
2041 }
2042 EXPORT_SYMBOL(sock_no_sendmsg);
2043
2044 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
2045 size_t len, int flags)
2046 {
2047 return -EOPNOTSUPP;
2048 }
2049 EXPORT_SYMBOL(sock_no_recvmsg);
2050
2051 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
2052 {
2053 /* Mirror missing mmap method error code */
2054 return -ENODEV;
2055 }
2056 EXPORT_SYMBOL(sock_no_mmap);
2057
2058 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
2059 {
2060 ssize_t res;
2061 struct msghdr msg = {.msg_flags = flags};
2062 struct kvec iov;
2063 char *kaddr = kmap(page);
2064 iov.iov_base = kaddr + offset;
2065 iov.iov_len = size;
2066 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
2067 kunmap(page);
2068 return res;
2069 }
2070 EXPORT_SYMBOL(sock_no_sendpage);
2071
2072 /*
2073 * Default Socket Callbacks
2074 */
2075
2076 static void sock_def_wakeup(struct sock *sk)
2077 {
2078 struct socket_wq *wq;
2079
2080 rcu_read_lock();
2081 wq = rcu_dereference(sk->sk_wq);
2082 if (wq_has_sleeper(wq))
2083 wake_up_interruptible_all(&wq->wait);
2084 rcu_read_unlock();
2085 }
2086
2087 static void sock_def_error_report(struct sock *sk)
2088 {
2089 struct socket_wq *wq;
2090
2091 rcu_read_lock();
2092 wq = rcu_dereference(sk->sk_wq);
2093 if (wq_has_sleeper(wq))
2094 wake_up_interruptible_poll(&wq->wait, POLLERR);
2095 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
2096 rcu_read_unlock();
2097 }
2098
2099 static void sock_def_readable(struct sock *sk, int len)
2100 {
2101 struct socket_wq *wq;
2102
2103 rcu_read_lock();
2104 wq = rcu_dereference(sk->sk_wq);
2105 if (wq_has_sleeper(wq))
2106 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
2107 POLLRDNORM | POLLRDBAND);
2108 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
2109 rcu_read_unlock();
2110 }
2111
2112 static void sock_def_write_space(struct sock *sk)
2113 {
2114 struct socket_wq *wq;
2115
2116 rcu_read_lock();
2117
2118 /* Do not wake up a writer until he can make "significant"
2119 * progress. --DaveM
2120 */
2121 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
2122 wq = rcu_dereference(sk->sk_wq);
2123 if (wq_has_sleeper(wq))
2124 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
2125 POLLWRNORM | POLLWRBAND);
2126
2127 /* Should agree with poll, otherwise some programs break */
2128 if (sock_writeable(sk))
2129 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
2130 }
2131
2132 rcu_read_unlock();
2133 }
2134
2135 static void sock_def_destruct(struct sock *sk)
2136 {
2137 kfree(sk->sk_protinfo);
2138 }
2139
2140 void sk_send_sigurg(struct sock *sk)
2141 {
2142 if (sk->sk_socket && sk->sk_socket->file)
2143 if (send_sigurg(&sk->sk_socket->file->f_owner))
2144 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
2145 }
2146 EXPORT_SYMBOL(sk_send_sigurg);
2147
2148 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
2149 unsigned long expires)
2150 {
2151 if (!mod_timer(timer, expires))
2152 sock_hold(sk);
2153 }
2154 EXPORT_SYMBOL(sk_reset_timer);
2155
2156 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
2157 {
2158 if (timer_pending(timer) && del_timer(timer))
2159 __sock_put(sk);
2160 }
2161 EXPORT_SYMBOL(sk_stop_timer);
2162
2163 void sock_init_data(struct socket *sock, struct sock *sk)
2164 {
2165 skb_queue_head_init(&sk->sk_receive_queue);
2166 skb_queue_head_init(&sk->sk_write_queue);
2167 skb_queue_head_init(&sk->sk_error_queue);
2168 #ifdef CONFIG_NET_DMA
2169 skb_queue_head_init(&sk->sk_async_wait_queue);
2170 #endif
2171
2172 sk->sk_send_head = NULL;
2173
2174 init_timer(&sk->sk_timer);
2175
2176 sk->sk_allocation = GFP_KERNEL;
2177 sk->sk_rcvbuf = sysctl_rmem_default;
2178 sk->sk_sndbuf = sysctl_wmem_default;
2179 sk->sk_state = TCP_CLOSE;
2180 sk_set_socket(sk, sock);
2181
2182 sock_set_flag(sk, SOCK_ZAPPED);
2183
2184 if (sock) {
2185 sk->sk_type = sock->type;
2186 sk->sk_wq = sock->wq;
2187 sock->sk = sk;
2188 } else
2189 sk->sk_wq = NULL;
2190
2191 spin_lock_init(&sk->sk_dst_lock);
2192 rwlock_init(&sk->sk_callback_lock);
2193 lockdep_set_class_and_name(&sk->sk_callback_lock,
2194 af_callback_keys + sk->sk_family,
2195 af_family_clock_key_strings[sk->sk_family]);
2196
2197 sk->sk_state_change = sock_def_wakeup;
2198 sk->sk_data_ready = sock_def_readable;
2199 sk->sk_write_space = sock_def_write_space;
2200 sk->sk_error_report = sock_def_error_report;
2201 sk->sk_destruct = sock_def_destruct;
2202
2203 sk->sk_frag.page = NULL;
2204 sk->sk_frag.offset = 0;
2205 sk->sk_peek_off = -1;
2206
2207 sk->sk_peer_pid = NULL;
2208 sk->sk_peer_cred = NULL;
2209 sk->sk_write_pending = 0;
2210 sk->sk_rcvlowat = 1;
2211 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
2212 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
2213
2214 sk->sk_stamp = ktime_set(-1L, 0);
2215
2216 /*
2217 * Before updating sk_refcnt, we must commit prior changes to memory
2218 * (Documentation/RCU/rculist_nulls.txt for details)
2219 */
2220 smp_wmb();
2221 atomic_set(&sk->sk_refcnt, 1);
2222 atomic_set(&sk->sk_drops, 0);
2223 }
2224 EXPORT_SYMBOL(sock_init_data);
2225
2226 void lock_sock_nested(struct sock *sk, int subclass)
2227 {
2228 might_sleep();
2229 spin_lock_bh(&sk->sk_lock.slock);
2230 if (sk->sk_lock.owned)
2231 __lock_sock(sk);
2232 sk->sk_lock.owned = 1;
2233 spin_unlock(&sk->sk_lock.slock);
2234 /*
2235 * The sk_lock has mutex_lock() semantics here:
2236 */
2237 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2238 local_bh_enable();
2239 }
2240 EXPORT_SYMBOL(lock_sock_nested);
2241
2242 void release_sock(struct sock *sk)
2243 {
2244 /*
2245 * The sk_lock has mutex_unlock() semantics:
2246 */
2247 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2248
2249 spin_lock_bh(&sk->sk_lock.slock);
2250 if (sk->sk_backlog.tail)
2251 __release_sock(sk);
2252
2253 if (sk->sk_prot->release_cb)
2254 sk->sk_prot->release_cb(sk);
2255
2256 sk->sk_lock.owned = 0;
2257 if (waitqueue_active(&sk->sk_lock.wq))
2258 wake_up(&sk->sk_lock.wq);
2259 spin_unlock_bh(&sk->sk_lock.slock);
2260 }
2261 EXPORT_SYMBOL(release_sock);
2262
2263 /**
2264 * lock_sock_fast - fast version of lock_sock
2265 * @sk: socket
2266 *
2267 * This version should be used for very small section, where process wont block
2268 * return false if fast path is taken
2269 * sk_lock.slock locked, owned = 0, BH disabled
2270 * return true if slow path is taken
2271 * sk_lock.slock unlocked, owned = 1, BH enabled
2272 */
2273 bool lock_sock_fast(struct sock *sk)
2274 {
2275 might_sleep();
2276 spin_lock_bh(&sk->sk_lock.slock);
2277
2278 if (!sk->sk_lock.owned)
2279 /*
2280 * Note : We must disable BH
2281 */
2282 return false;
2283
2284 __lock_sock(sk);
2285 sk->sk_lock.owned = 1;
2286 spin_unlock(&sk->sk_lock.slock);
2287 /*
2288 * The sk_lock has mutex_lock() semantics here:
2289 */
2290 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2291 local_bh_enable();
2292 return true;
2293 }
2294 EXPORT_SYMBOL(lock_sock_fast);
2295
2296 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2297 {
2298 struct timeval tv;
2299 if (!sock_flag(sk, SOCK_TIMESTAMP))
2300 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2301 tv = ktime_to_timeval(sk->sk_stamp);
2302 if (tv.tv_sec == -1)
2303 return -ENOENT;
2304 if (tv.tv_sec == 0) {
2305 sk->sk_stamp = ktime_get_real();
2306 tv = ktime_to_timeval(sk->sk_stamp);
2307 }
2308 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2309 }
2310 EXPORT_SYMBOL(sock_get_timestamp);
2311
2312 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2313 {
2314 struct timespec ts;
2315 if (!sock_flag(sk, SOCK_TIMESTAMP))
2316 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2317 ts = ktime_to_timespec(sk->sk_stamp);
2318 if (ts.tv_sec == -1)
2319 return -ENOENT;
2320 if (ts.tv_sec == 0) {
2321 sk->sk_stamp = ktime_get_real();
2322 ts = ktime_to_timespec(sk->sk_stamp);
2323 }
2324 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2325 }
2326 EXPORT_SYMBOL(sock_get_timestampns);
2327
2328 void sock_enable_timestamp(struct sock *sk, int flag)
2329 {
2330 if (!sock_flag(sk, flag)) {
2331 unsigned long previous_flags = sk->sk_flags;
2332
2333 sock_set_flag(sk, flag);
2334 /*
2335 * we just set one of the two flags which require net
2336 * time stamping, but time stamping might have been on
2337 * already because of the other one
2338 */
2339 if (!(previous_flags & SK_FLAGS_TIMESTAMP))
2340 net_enable_timestamp();
2341 }
2342 }
2343
2344 /*
2345 * Get a socket option on an socket.
2346 *
2347 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2348 * asynchronous errors should be reported by getsockopt. We assume
2349 * this means if you specify SO_ERROR (otherwise whats the point of it).
2350 */
2351 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2352 char __user *optval, int __user *optlen)
2353 {
2354 struct sock *sk = sock->sk;
2355
2356 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2357 }
2358 EXPORT_SYMBOL(sock_common_getsockopt);
2359
2360 #ifdef CONFIG_COMPAT
2361 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2362 char __user *optval, int __user *optlen)
2363 {
2364 struct sock *sk = sock->sk;
2365
2366 if (sk->sk_prot->compat_getsockopt != NULL)
2367 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2368 optval, optlen);
2369 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2370 }
2371 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2372 #endif
2373
2374 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2375 struct msghdr *msg, size_t size, int flags)
2376 {
2377 struct sock *sk = sock->sk;
2378 int addr_len = 0;
2379 int err;
2380
2381 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2382 flags & ~MSG_DONTWAIT, &addr_len);
2383 if (err >= 0)
2384 msg->msg_namelen = addr_len;
2385 return err;
2386 }
2387 EXPORT_SYMBOL(sock_common_recvmsg);
2388
2389 /*
2390 * Set socket options on an inet socket.
2391 */
2392 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2393 char __user *optval, unsigned int optlen)
2394 {
2395 struct sock *sk = sock->sk;
2396
2397 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2398 }
2399 EXPORT_SYMBOL(sock_common_setsockopt);
2400
2401 #ifdef CONFIG_COMPAT
2402 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2403 char __user *optval, unsigned int optlen)
2404 {
2405 struct sock *sk = sock->sk;
2406
2407 if (sk->sk_prot->compat_setsockopt != NULL)
2408 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2409 optval, optlen);
2410 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2411 }
2412 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2413 #endif
2414
2415 void sk_common_release(struct sock *sk)
2416 {
2417 if (sk->sk_prot->destroy)
2418 sk->sk_prot->destroy(sk);
2419
2420 /*
2421 * Observation: when sock_common_release is called, processes have
2422 * no access to socket. But net still has.
2423 * Step one, detach it from networking:
2424 *
2425 * A. Remove from hash tables.
2426 */
2427
2428 sk->sk_prot->unhash(sk);
2429
2430 /*
2431 * In this point socket cannot receive new packets, but it is possible
2432 * that some packets are in flight because some CPU runs receiver and
2433 * did hash table lookup before we unhashed socket. They will achieve
2434 * receive queue and will be purged by socket destructor.
2435 *
2436 * Also we still have packets pending on receive queue and probably,
2437 * our own packets waiting in device queues. sock_destroy will drain
2438 * receive queue, but transmitted packets will delay socket destruction
2439 * until the last reference will be released.
2440 */
2441
2442 sock_orphan(sk);
2443
2444 xfrm_sk_free_policy(sk);
2445
2446 sk_refcnt_debug_release(sk);
2447
2448 if (sk->sk_frag.page) {
2449 put_page(sk->sk_frag.page);
2450 sk->sk_frag.page = NULL;
2451 }
2452
2453 sock_put(sk);
2454 }
2455 EXPORT_SYMBOL(sk_common_release);
2456
2457 #ifdef CONFIG_PROC_FS
2458 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2459 struct prot_inuse {
2460 int val[PROTO_INUSE_NR];
2461 };
2462
2463 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2464
2465 #ifdef CONFIG_NET_NS
2466 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2467 {
2468 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2469 }
2470 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2471
2472 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2473 {
2474 int cpu, idx = prot->inuse_idx;
2475 int res = 0;
2476
2477 for_each_possible_cpu(cpu)
2478 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2479
2480 return res >= 0 ? res : 0;
2481 }
2482 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2483
2484 static int __net_init sock_inuse_init_net(struct net *net)
2485 {
2486 net->core.inuse = alloc_percpu(struct prot_inuse);
2487 return net->core.inuse ? 0 : -ENOMEM;
2488 }
2489
2490 static void __net_exit sock_inuse_exit_net(struct net *net)
2491 {
2492 free_percpu(net->core.inuse);
2493 }
2494
2495 static struct pernet_operations net_inuse_ops = {
2496 .init = sock_inuse_init_net,
2497 .exit = sock_inuse_exit_net,
2498 };
2499
2500 static __init int net_inuse_init(void)
2501 {
2502 if (register_pernet_subsys(&net_inuse_ops))
2503 panic("Cannot initialize net inuse counters");
2504
2505 return 0;
2506 }
2507
2508 core_initcall(net_inuse_init);
2509 #else
2510 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2511
2512 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2513 {
2514 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2515 }
2516 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2517
2518 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2519 {
2520 int cpu, idx = prot->inuse_idx;
2521 int res = 0;
2522
2523 for_each_possible_cpu(cpu)
2524 res += per_cpu(prot_inuse, cpu).val[idx];
2525
2526 return res >= 0 ? res : 0;
2527 }
2528 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2529 #endif
2530
2531 static void assign_proto_idx(struct proto *prot)
2532 {
2533 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2534
2535 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2536 pr_err("PROTO_INUSE_NR exhausted\n");
2537 return;
2538 }
2539
2540 set_bit(prot->inuse_idx, proto_inuse_idx);
2541 }
2542
2543 static void release_proto_idx(struct proto *prot)
2544 {
2545 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2546 clear_bit(prot->inuse_idx, proto_inuse_idx);
2547 }
2548 #else
2549 static inline void assign_proto_idx(struct proto *prot)
2550 {
2551 }
2552
2553 static inline void release_proto_idx(struct proto *prot)
2554 {
2555 }
2556 #endif
2557
2558 int proto_register(struct proto *prot, int alloc_slab)
2559 {
2560 if (alloc_slab) {
2561 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2562 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2563 NULL);
2564
2565 if (prot->slab == NULL) {
2566 pr_crit("%s: Can't create sock SLAB cache!\n",
2567 prot->name);
2568 goto out;
2569 }
2570
2571 if (prot->rsk_prot != NULL) {
2572 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
2573 if (prot->rsk_prot->slab_name == NULL)
2574 goto out_free_sock_slab;
2575
2576 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2577 prot->rsk_prot->obj_size, 0,
2578 SLAB_HWCACHE_ALIGN, NULL);
2579
2580 if (prot->rsk_prot->slab == NULL) {
2581 pr_crit("%s: Can't create request sock SLAB cache!\n",
2582 prot->name);
2583 goto out_free_request_sock_slab_name;
2584 }
2585 }
2586
2587 if (prot->twsk_prot != NULL) {
2588 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2589
2590 if (prot->twsk_prot->twsk_slab_name == NULL)
2591 goto out_free_request_sock_slab;
2592
2593 prot->twsk_prot->twsk_slab =
2594 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2595 prot->twsk_prot->twsk_obj_size,
2596 0,
2597 SLAB_HWCACHE_ALIGN |
2598 prot->slab_flags,
2599 NULL);
2600 if (prot->twsk_prot->twsk_slab == NULL)
2601 goto out_free_timewait_sock_slab_name;
2602 }
2603 }
2604
2605 mutex_lock(&proto_list_mutex);
2606 list_add(&prot->node, &proto_list);
2607 assign_proto_idx(prot);
2608 mutex_unlock(&proto_list_mutex);
2609 return 0;
2610
2611 out_free_timewait_sock_slab_name:
2612 kfree(prot->twsk_prot->twsk_slab_name);
2613 out_free_request_sock_slab:
2614 if (prot->rsk_prot && prot->rsk_prot->slab) {
2615 kmem_cache_destroy(prot->rsk_prot->slab);
2616 prot->rsk_prot->slab = NULL;
2617 }
2618 out_free_request_sock_slab_name:
2619 if (prot->rsk_prot)
2620 kfree(prot->rsk_prot->slab_name);
2621 out_free_sock_slab:
2622 kmem_cache_destroy(prot->slab);
2623 prot->slab = NULL;
2624 out:
2625 return -ENOBUFS;
2626 }
2627 EXPORT_SYMBOL(proto_register);
2628
2629 void proto_unregister(struct proto *prot)
2630 {
2631 mutex_lock(&proto_list_mutex);
2632 release_proto_idx(prot);
2633 list_del(&prot->node);
2634 mutex_unlock(&proto_list_mutex);
2635
2636 if (prot->slab != NULL) {
2637 kmem_cache_destroy(prot->slab);
2638 prot->slab = NULL;
2639 }
2640
2641 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2642 kmem_cache_destroy(prot->rsk_prot->slab);
2643 kfree(prot->rsk_prot->slab_name);
2644 prot->rsk_prot->slab = NULL;
2645 }
2646
2647 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2648 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2649 kfree(prot->twsk_prot->twsk_slab_name);
2650 prot->twsk_prot->twsk_slab = NULL;
2651 }
2652 }
2653 EXPORT_SYMBOL(proto_unregister);
2654
2655 #ifdef CONFIG_PROC_FS
2656 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2657 __acquires(proto_list_mutex)
2658 {
2659 mutex_lock(&proto_list_mutex);
2660 return seq_list_start_head(&proto_list, *pos);
2661 }
2662
2663 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2664 {
2665 return seq_list_next(v, &proto_list, pos);
2666 }
2667
2668 static void proto_seq_stop(struct seq_file *seq, void *v)
2669 __releases(proto_list_mutex)
2670 {
2671 mutex_unlock(&proto_list_mutex);
2672 }
2673
2674 static char proto_method_implemented(const void *method)
2675 {
2676 return method == NULL ? 'n' : 'y';
2677 }
2678 static long sock_prot_memory_allocated(struct proto *proto)
2679 {
2680 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
2681 }
2682
2683 static char *sock_prot_memory_pressure(struct proto *proto)
2684 {
2685 return proto->memory_pressure != NULL ?
2686 proto_memory_pressure(proto) ? "yes" : "no" : "NI";
2687 }
2688
2689 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2690 {
2691
2692 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
2693 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2694 proto->name,
2695 proto->obj_size,
2696 sock_prot_inuse_get(seq_file_net(seq), proto),
2697 sock_prot_memory_allocated(proto),
2698 sock_prot_memory_pressure(proto),
2699 proto->max_header,
2700 proto->slab == NULL ? "no" : "yes",
2701 module_name(proto->owner),
2702 proto_method_implemented(proto->close),
2703 proto_method_implemented(proto->connect),
2704 proto_method_implemented(proto->disconnect),
2705 proto_method_implemented(proto->accept),
2706 proto_method_implemented(proto->ioctl),
2707 proto_method_implemented(proto->init),
2708 proto_method_implemented(proto->destroy),
2709 proto_method_implemented(proto->shutdown),
2710 proto_method_implemented(proto->setsockopt),
2711 proto_method_implemented(proto->getsockopt),
2712 proto_method_implemented(proto->sendmsg),
2713 proto_method_implemented(proto->recvmsg),
2714 proto_method_implemented(proto->sendpage),
2715 proto_method_implemented(proto->bind),
2716 proto_method_implemented(proto->backlog_rcv),
2717 proto_method_implemented(proto->hash),
2718 proto_method_implemented(proto->unhash),
2719 proto_method_implemented(proto->get_port),
2720 proto_method_implemented(proto->enter_memory_pressure));
2721 }
2722
2723 static int proto_seq_show(struct seq_file *seq, void *v)
2724 {
2725 if (v == &proto_list)
2726 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2727 "protocol",
2728 "size",
2729 "sockets",
2730 "memory",
2731 "press",
2732 "maxhdr",
2733 "slab",
2734 "module",
2735 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2736 else
2737 proto_seq_printf(seq, list_entry(v, struct proto, node));
2738 return 0;
2739 }
2740
2741 static const struct seq_operations proto_seq_ops = {
2742 .start = proto_seq_start,
2743 .next = proto_seq_next,
2744 .stop = proto_seq_stop,
2745 .show = proto_seq_show,
2746 };
2747
2748 static int proto_seq_open(struct inode *inode, struct file *file)
2749 {
2750 return seq_open_net(inode, file, &proto_seq_ops,
2751 sizeof(struct seq_net_private));
2752 }
2753
2754 static const struct file_operations proto_seq_fops = {
2755 .owner = THIS_MODULE,
2756 .open = proto_seq_open,
2757 .read = seq_read,
2758 .llseek = seq_lseek,
2759 .release = seq_release_net,
2760 };
2761
2762 static __net_init int proto_init_net(struct net *net)
2763 {
2764 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2765 return -ENOMEM;
2766
2767 return 0;
2768 }
2769
2770 static __net_exit void proto_exit_net(struct net *net)
2771 {
2772 proc_net_remove(net, "protocols");
2773 }
2774
2775
2776 static __net_initdata struct pernet_operations proto_net_ops = {
2777 .init = proto_init_net,
2778 .exit = proto_exit_net,
2779 };
2780
2781 static int __init proto_init(void)
2782 {
2783 return register_pernet_subsys(&proto_net_ops);
2784 }
2785
2786 subsys_initcall(proto_init);
2787
2788 #endif /* PROC_FS */
Linux kernel - Deliverables
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